blob: b1766a67d2ebf0bac25baee4e7bb2a5781e48158 [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/namei.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/namei.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 * Directory entry file type support and forward compatibility hooks
18 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
19 * Hash Tree Directory indexing (c)
20 * Daniel Phillips, 2001
21 * Hash Tree Directory indexing porting
22 * Christopher Li, 2002
23 * Hash Tree Directory indexing cleanup
24 * Theodore Ts'o, 2002
25 */
26
27#include <linux/fs.h>
28#include <linux/pagemap.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029#include <linux/time.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070030#include <linux/fcntl.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/quotaops.h>
34#include <linux/buffer_head.h>
35#include <linux/bio.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040036#include "ext4.h"
37#include "ext4_jbd2.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039#include "xattr.h"
40#include "acl.h"
41
Jiaying Zhang0562e0b2011-03-21 21:38:05 -040042#include <trace/events/ext4.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043/*
44 * define how far ahead to read directories while searching them.
45 */
46#define NAMEI_RA_CHUNKS 2
47#define NAMEI_RA_BLOCKS 4
Dave Kleikamp8c55e202007-05-24 13:04:54 -040048#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049
Mingming Cao617ba132006-10-11 01:20:53 -070050static struct buffer_head *ext4_append(handle_t *handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 struct inode *inode,
Theodore Ts'o0f70b402013-02-15 03:35:57 -050052 ext4_lblk_t *block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053{
54 struct buffer_head *bh;
Theodore Ts'o1c215022014-08-29 20:52:15 -040055 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070056
Theodore Ts'odf981d02012-08-17 09:48:17 -040057 if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
58 ((inode->i_size >> 10) >=
Theodore Ts'o0f70b402013-02-15 03:35:57 -050059 EXT4_SB(inode->i_sb)->s_max_dir_size_kb)))
60 return ERR_PTR(-ENOSPC);
Theodore Ts'odf981d02012-08-17 09:48:17 -040061
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062 *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
63
Theodore Ts'oc5e298a2015-06-21 01:25:29 -040064 bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
Theodore Ts'o1c215022014-08-29 20:52:15 -040065 if (IS_ERR(bh))
66 return bh;
Theodore Ts'o0f70b402013-02-15 03:35:57 -050067 inode->i_size += inode->i_sb->s_blocksize;
68 EXT4_I(inode)->i_disksize = inode->i_size;
liang xie5d601252014-05-12 22:06:43 -040069 BUFFER_TRACE(bh, "get_write_access");
Theodore Ts'o0f70b402013-02-15 03:35:57 -050070 err = ext4_journal_get_write_access(handle, bh);
71 if (err) {
72 brelse(bh);
73 ext4_std_error(inode->i_sb, err);
74 return ERR_PTR(err);
Carlos Maiolino6d1ab102012-09-27 09:31:33 -040075 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -070076 return bh;
77}
78
Theodore Ts'odc6982f2013-02-14 23:59:26 -050079static int ext4_dx_csum_verify(struct inode *inode,
80 struct ext4_dir_entry *dirent);
81
82typedef enum {
83 EITHER, INDEX, DIRENT
84} dirblock_type_t;
85
86#define ext4_read_dirblock(inode, block, type) \
Andreas Dilgerb03a2f72015-06-15 14:50:26 -040087 __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__)
Theodore Ts'odc6982f2013-02-14 23:59:26 -050088
89static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
Andreas Dilgerb03a2f72015-06-15 14:50:26 -040090 ext4_lblk_t block,
91 dirblock_type_t type,
92 const char *func,
93 unsigned int line)
Theodore Ts'odc6982f2013-02-14 23:59:26 -050094{
95 struct buffer_head *bh;
96 struct ext4_dir_entry *dirent;
Theodore Ts'o1c215022014-08-29 20:52:15 -040097 int is_dx_block = 0;
Theodore Ts'odc6982f2013-02-14 23:59:26 -050098
Theodore Ts'o1c215022014-08-29 20:52:15 -040099 bh = ext4_bread(NULL, inode, block, 0);
100 if (IS_ERR(bh)) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400101 __ext4_warning(inode->i_sb, func, line,
102 "inode #%lu: lblock %lu: comm %s: "
103 "error %ld reading directory block",
104 inode->i_ino, (unsigned long)block,
105 current->comm, PTR_ERR(bh));
Theodore Ts'o1c215022014-08-29 20:52:15 -0400106
107 return bh;
108 }
109 if (!bh) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400110 ext4_error_inode(inode, func, line, block,
111 "Directory hole found");
Darrick J. Wong6a797d22015-10-17 16:16:04 -0400112 return ERR_PTR(-EFSCORRUPTED);
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500113 }
114 dirent = (struct ext4_dir_entry *) bh->b_data;
115 /* Determine whether or not we have an index block */
116 if (is_dx(inode)) {
117 if (block == 0)
118 is_dx_block = 1;
119 else if (ext4_rec_len_from_disk(dirent->rec_len,
120 inode->i_sb->s_blocksize) ==
121 inode->i_sb->s_blocksize)
122 is_dx_block = 1;
123 }
124 if (!is_dx_block && type == INDEX) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400125 ext4_error_inode(inode, func, line, block,
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500126 "directory leaf block found instead of index block");
Darrick J. Wong6a797d22015-10-17 16:16:04 -0400127 return ERR_PTR(-EFSCORRUPTED);
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500128 }
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400129 if (!ext4_has_metadata_csum(inode->i_sb) ||
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500130 buffer_verified(bh))
131 return bh;
132
133 /*
134 * An empty leaf block can get mistaken for a index block; for
135 * this reason, we can only check the index checksum when the
136 * caller is sure it should be an index block.
137 */
138 if (is_dx_block && type == INDEX) {
139 if (ext4_dx_csum_verify(inode, dirent))
140 set_buffer_verified(bh);
141 else {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400142 ext4_error_inode(inode, func, line, block,
143 "Directory index failed checksum");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700144 brelse(bh);
Darrick J. Wong6a797d22015-10-17 16:16:04 -0400145 return ERR_PTR(-EFSBADCRC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700146 }
147 }
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500148 if (!is_dx_block) {
149 if (ext4_dirent_csum_verify(inode, dirent))
150 set_buffer_verified(bh);
151 else {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400152 ext4_error_inode(inode, func, line, block,
153 "Directory block failed checksum");
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500154 brelse(bh);
Darrick J. Wong6a797d22015-10-17 16:16:04 -0400155 return ERR_PTR(-EFSBADCRC);
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500156 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700157 }
158 return bh;
159}
160
161#ifndef assert
162#define assert(test) J_ASSERT(test)
163#endif
164
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700165#ifdef DX_DEBUG
166#define dxtrace(command) command
167#else
168#define dxtrace(command)
169#endif
170
171struct fake_dirent
172{
173 __le32 inode;
174 __le16 rec_len;
175 u8 name_len;
176 u8 file_type;
177};
178
179struct dx_countlimit
180{
181 __le16 limit;
182 __le16 count;
183};
184
185struct dx_entry
186{
187 __le32 hash;
188 __le32 block;
189};
190
191/*
192 * dx_root_info is laid out so that if it should somehow get overlaid by a
193 * dirent the two low bits of the hash version will be zero. Therefore, the
194 * hash version mod 4 should never be 0. Sincerely, the paranoia department.
195 */
196
197struct dx_root
198{
199 struct fake_dirent dot;
200 char dot_name[4];
201 struct fake_dirent dotdot;
202 char dotdot_name[4];
203 struct dx_root_info
204 {
205 __le32 reserved_zero;
206 u8 hash_version;
207 u8 info_length; /* 8 */
208 u8 indirect_levels;
209 u8 unused_flags;
210 }
211 info;
212 struct dx_entry entries[0];
213};
214
215struct dx_node
216{
217 struct fake_dirent fake;
218 struct dx_entry entries[0];
219};
220
221
222struct dx_frame
223{
224 struct buffer_head *bh;
225 struct dx_entry *entries;
226 struct dx_entry *at;
227};
228
229struct dx_map_entry
230{
231 u32 hash;
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700232 u16 offs;
233 u16 size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700234};
235
Darrick J. Wonge6153912012-04-29 18:23:10 -0400236/*
237 * This goes at the end of each htree block.
238 */
239struct dx_tail {
240 u32 dt_reserved;
241 __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */
242};
243
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500244static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
245static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400246static inline unsigned dx_get_hash(struct dx_entry *entry);
247static void dx_set_hash(struct dx_entry *entry, unsigned value);
248static unsigned dx_get_count(struct dx_entry *entries);
249static unsigned dx_get_limit(struct dx_entry *entries);
250static void dx_set_count(struct dx_entry *entries, unsigned value);
251static void dx_set_limit(struct dx_entry *entries, unsigned value);
252static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
253static unsigned dx_node_limit(struct inode *dir);
Theodore Ts'o5b643f92015-05-18 13:14:47 -0400254static struct dx_frame *dx_probe(struct ext4_filename *fname,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700255 struct inode *dir,
256 struct dx_hash_info *hinfo,
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400257 struct dx_frame *frame);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400258static void dx_release(struct dx_frame *frames);
Michael Halcrow1f3862b2015-04-12 01:09:03 -0400259static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
260 unsigned blocksize, struct dx_hash_info *hinfo,
261 struct dx_map_entry map[]);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262static void dx_sort_map(struct dx_map_entry *map, unsigned count);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400263static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to,
Wei Yongjun3d0518f2009-02-14 23:01:36 -0500264 struct dx_map_entry *offsets, int count, unsigned blocksize);
Theodore Ts'o8bad4592009-02-14 21:46:54 -0500265static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500266static void dx_insert_block(struct dx_frame *frame,
267 u32 hash, ext4_lblk_t block);
Mingming Cao617ba132006-10-11 01:20:53 -0700268static int ext4_htree_next_block(struct inode *dir, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700269 struct dx_frame *frame,
270 struct dx_frame *frames,
271 __u32 *start_hash);
Theodore Ts'of702ba02008-09-22 15:21:01 -0400272static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
Theodore Ts'o5b643f92015-05-18 13:14:47 -0400273 struct ext4_filename *fname,
Theodore Ts'o537d8f92014-08-29 20:49:51 -0400274 struct ext4_dir_entry_2 **res_dir);
Theodore Ts'o5b643f92015-05-18 13:14:47 -0400275static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
Theodore Ts'o56a04912016-01-08 16:00:31 -0500276 struct inode *dir, struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700277
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400278/* checksumming functions */
Tao Ma3c47d542012-12-10 14:05:59 -0500279void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
280 unsigned int blocksize)
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400281{
282 memset(t, 0, sizeof(struct ext4_dir_entry_tail));
283 t->det_rec_len = ext4_rec_len_to_disk(
284 sizeof(struct ext4_dir_entry_tail), blocksize);
285 t->det_reserved_ft = EXT4_FT_DIR_CSUM;
286}
287
288/* Walk through a dirent block to find a checksum "dirent" at the tail */
289static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
290 struct ext4_dir_entry *de)
291{
292 struct ext4_dir_entry_tail *t;
293
294#ifdef PARANOID
295 struct ext4_dir_entry *d, *top;
296
297 d = de;
298 top = (struct ext4_dir_entry *)(((void *)de) +
299 (EXT4_BLOCK_SIZE(inode->i_sb) -
300 sizeof(struct ext4_dir_entry_tail)));
301 while (d < top && d->rec_len)
302 d = (struct ext4_dir_entry *)(((void *)d) +
303 le16_to_cpu(d->rec_len));
304
305 if (d != top)
306 return NULL;
307
308 t = (struct ext4_dir_entry_tail *)d;
309#else
310 t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb));
311#endif
312
313 if (t->det_reserved_zero1 ||
314 le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) ||
315 t->det_reserved_zero2 ||
316 t->det_reserved_ft != EXT4_FT_DIR_CSUM)
317 return NULL;
318
319 return t;
320}
321
322static __le32 ext4_dirent_csum(struct inode *inode,
323 struct ext4_dir_entry *dirent, int size)
324{
325 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
326 struct ext4_inode_info *ei = EXT4_I(inode);
327 __u32 csum;
328
329 csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
330 return cpu_to_le32(csum);
331}
332
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400333#define warn_no_space_for_csum(inode) \
334 __warn_no_space_for_csum((inode), __func__, __LINE__)
335
336static void __warn_no_space_for_csum(struct inode *inode, const char *func,
337 unsigned int line)
Theodore Ts'odffe9d82012-11-10 22:20:05 -0500338{
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400339 __ext4_warning_inode(inode, func, line,
340 "No space for directory leaf checksum. Please run e2fsck -D.");
Theodore Ts'odffe9d82012-11-10 22:20:05 -0500341}
342
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400343int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent)
344{
345 struct ext4_dir_entry_tail *t;
346
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400347 if (!ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400348 return 1;
349
350 t = get_dirent_tail(inode, dirent);
351 if (!t) {
Theodore Ts'odffe9d82012-11-10 22:20:05 -0500352 warn_no_space_for_csum(inode);
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400353 return 0;
354 }
355
356 if (t->det_checksum != ext4_dirent_csum(inode, dirent,
357 (void *)t - (void *)dirent))
358 return 0;
359
360 return 1;
361}
362
363static void ext4_dirent_csum_set(struct inode *inode,
364 struct ext4_dir_entry *dirent)
365{
366 struct ext4_dir_entry_tail *t;
367
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400368 if (!ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400369 return;
370
371 t = get_dirent_tail(inode, dirent);
372 if (!t) {
Theodore Ts'odffe9d82012-11-10 22:20:05 -0500373 warn_no_space_for_csum(inode);
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400374 return;
375 }
376
377 t->det_checksum = ext4_dirent_csum(inode, dirent,
378 (void *)t - (void *)dirent);
379}
380
Tao Ma3c47d542012-12-10 14:05:59 -0500381int ext4_handle_dirty_dirent_node(handle_t *handle,
382 struct inode *inode,
383 struct buffer_head *bh)
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400384{
385 ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
386 return ext4_handle_dirty_metadata(handle, inode, bh);
387}
388
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400389static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
390 struct ext4_dir_entry *dirent,
391 int *offset)
392{
393 struct ext4_dir_entry *dp;
394 struct dx_root_info *root;
395 int count_offset;
396
397 if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb))
398 count_offset = 8;
399 else if (le16_to_cpu(dirent->rec_len) == 12) {
400 dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
401 if (le16_to_cpu(dp->rec_len) !=
402 EXT4_BLOCK_SIZE(inode->i_sb) - 12)
403 return NULL;
404 root = (struct dx_root_info *)(((void *)dp + 12));
405 if (root->reserved_zero ||
406 root->info_length != sizeof(struct dx_root_info))
407 return NULL;
408 count_offset = 32;
409 } else
410 return NULL;
411
412 if (offset)
413 *offset = count_offset;
414 return (struct dx_countlimit *)(((void *)dirent) + count_offset);
415}
416
417static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
418 int count_offset, int count, struct dx_tail *t)
419{
420 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
421 struct ext4_inode_info *ei = EXT4_I(inode);
Theodore Ts'od6a77102013-04-09 23:59:55 -0400422 __u32 csum;
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400423 int size;
Daeho Jeongb47820e2016-07-03 17:51:39 -0400424 __u32 dummy_csum = 0;
425 int offset = offsetof(struct dx_tail, dt_checksum);
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400426
427 size = count_offset + (count * sizeof(struct dx_entry));
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400428 csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
Daeho Jeongb47820e2016-07-03 17:51:39 -0400429 csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
430 csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400431
432 return cpu_to_le32(csum);
433}
434
435static int ext4_dx_csum_verify(struct inode *inode,
436 struct ext4_dir_entry *dirent)
437{
438 struct dx_countlimit *c;
439 struct dx_tail *t;
440 int count_offset, limit, count;
441
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400442 if (!ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400443 return 1;
444
445 c = get_dx_countlimit(inode, dirent, &count_offset);
446 if (!c) {
447 EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
Daeho Jeongfa964542016-07-03 21:11:08 -0400448 return 0;
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400449 }
450 limit = le16_to_cpu(c->limit);
451 count = le16_to_cpu(c->count);
452 if (count_offset + (limit * sizeof(struct dx_entry)) >
453 EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
Theodore Ts'odffe9d82012-11-10 22:20:05 -0500454 warn_no_space_for_csum(inode);
Daeho Jeongfa964542016-07-03 21:11:08 -0400455 return 0;
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400456 }
457 t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
458
459 if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset,
460 count, t))
461 return 0;
462 return 1;
463}
464
465static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
466{
467 struct dx_countlimit *c;
468 struct dx_tail *t;
469 int count_offset, limit, count;
470
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400471 if (!ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400472 return;
473
474 c = get_dx_countlimit(inode, dirent, &count_offset);
475 if (!c) {
476 EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
477 return;
478 }
479 limit = le16_to_cpu(c->limit);
480 count = le16_to_cpu(c->count);
481 if (count_offset + (limit * sizeof(struct dx_entry)) >
482 EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
Theodore Ts'odffe9d82012-11-10 22:20:05 -0500483 warn_no_space_for_csum(inode);
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400484 return;
485 }
486 t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
487
488 t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t);
489}
490
491static inline int ext4_handle_dirty_dx_node(handle_t *handle,
492 struct inode *inode,
493 struct buffer_head *bh)
494{
495 ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
496 return ext4_handle_dirty_metadata(handle, inode, bh);
497}
498
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700499/*
Li Zefanf795e142008-07-11 19:27:31 -0400500 * p is at least 6 bytes before the end of page
501 */
502static inline struct ext4_dir_entry_2 *
Wei Yongjun3d0518f2009-02-14 23:01:36 -0500503ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
Li Zefanf795e142008-07-11 19:27:31 -0400504{
505 return (struct ext4_dir_entry_2 *)((char *)p +
Wei Yongjun3d0518f2009-02-14 23:01:36 -0500506 ext4_rec_len_from_disk(p->rec_len, blocksize));
Li Zefanf795e142008-07-11 19:27:31 -0400507}
508
509/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700510 * Future: use high four bits of block for coalesce-on-delete flags
511 * Mask them off for now.
512 */
513
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500514static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700515{
516 return le32_to_cpu(entry->block) & 0x00ffffff;
517}
518
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500519static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700520{
521 entry->block = cpu_to_le32(value);
522}
523
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400524static inline unsigned dx_get_hash(struct dx_entry *entry)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700525{
526 return le32_to_cpu(entry->hash);
527}
528
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400529static inline void dx_set_hash(struct dx_entry *entry, unsigned value)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700530{
531 entry->hash = cpu_to_le32(value);
532}
533
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400534static inline unsigned dx_get_count(struct dx_entry *entries)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700535{
536 return le16_to_cpu(((struct dx_countlimit *) entries)->count);
537}
538
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400539static inline unsigned dx_get_limit(struct dx_entry *entries)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700540{
541 return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
542}
543
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400544static inline void dx_set_count(struct dx_entry *entries, unsigned value)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700545{
546 ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
547}
548
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400549static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700550{
551 ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
552}
553
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400554static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700555{
Mingming Cao617ba132006-10-11 01:20:53 -0700556 unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
557 EXT4_DIR_REC_LEN(2) - infosize;
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400558
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400559 if (ext4_has_metadata_csum(dir->i_sb))
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400560 entry_space -= sizeof(struct dx_tail);
Li Zefand9c769b2008-07-11 19:27:31 -0400561 return entry_space / sizeof(struct dx_entry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700562}
563
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400564static inline unsigned dx_node_limit(struct inode *dir)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700565{
Mingming Cao617ba132006-10-11 01:20:53 -0700566 unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400567
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400568 if (ext4_has_metadata_csum(dir->i_sb))
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400569 entry_space -= sizeof(struct dx_tail);
Li Zefand9c769b2008-07-11 19:27:31 -0400570 return entry_space / sizeof(struct dx_entry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700571}
572
573/*
574 * Debug
575 */
576#ifdef DX_DEBUG
Theodore Ts'o4776004f2008-09-08 23:00:52 -0400577static void dx_show_index(char * label, struct dx_entry *entries)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700578{
Andrew Morton63f57932006-10-11 01:21:24 -0700579 int i, n = dx_get_count (entries);
Joe Perchesd74f3d22016-10-15 09:57:31 -0400580 printk(KERN_DEBUG "%s index", label);
Andrew Morton63f57932006-10-11 01:21:24 -0700581 for (i = 0; i < n; i++) {
Joe Perchesd74f3d22016-10-15 09:57:31 -0400582 printk(KERN_CONT " %x->%lu",
583 i ? dx_get_hash(entries + i) : 0,
584 (unsigned long)dx_get_block(entries + i));
Andrew Morton63f57932006-10-11 01:21:24 -0700585 }
Joe Perchesd74f3d22016-10-15 09:57:31 -0400586 printk(KERN_CONT "\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700587}
588
589struct stats
590{
591 unsigned names;
592 unsigned space;
593 unsigned bcount;
594};
595
Michael Halcrowb3098482015-04-12 01:07:01 -0400596static struct stats dx_show_leaf(struct inode *dir,
597 struct dx_hash_info *hinfo,
598 struct ext4_dir_entry_2 *de,
599 int size, int show_names)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700600{
601 unsigned names = 0, space = 0;
602 char *base = (char *) de;
603 struct dx_hash_info h = *hinfo;
604
605 printk("names: ");
606 while ((char *) de < base + size)
607 {
608 if (de->inode)
609 {
610 if (show_names)
611 {
Michael Halcrowb3098482015-04-12 01:07:01 -0400612#ifdef CONFIG_EXT4_FS_ENCRYPTION
613 int len;
614 char *name;
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400615 struct fscrypt_str fname_crypto_str =
616 FSTR_INIT(NULL, 0);
Theodore Ts'oc936e1e2015-05-31 13:34:22 -0400617 int res = 0;
Michael Halcrowb3098482015-04-12 01:07:01 -0400618
619 name = de->name;
620 len = de->name_len;
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400621 if (ext4_encrypted_inode(dir))
622 res = fscrypt_get_encryption_info(dir);
Theodore Ts'ob7236e22015-05-18 13:17:47 -0400623 if (res) {
624 printk(KERN_WARNING "Error setting up"
625 " fname crypto: %d\n", res);
Michael Halcrowb3098482015-04-12 01:07:01 -0400626 }
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400627 if (!fscrypt_has_encryption_key(dir)) {
Michael Halcrowb3098482015-04-12 01:07:01 -0400628 /* Directory is not encrypted */
629 ext4fs_dirhash(de->name,
630 de->name_len, &h);
631 printk("%*.s:(U)%x.%u ", len,
632 name, h.hash,
633 (unsigned) ((char *) de
634 - base));
635 } else {
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400636 struct fscrypt_str de_name =
637 FSTR_INIT(name, len);
638
Michael Halcrowb3098482015-04-12 01:07:01 -0400639 /* Directory is encrypted */
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400640 res = fscrypt_fname_alloc_buffer(
641 dir, len,
Michael Halcrowb3098482015-04-12 01:07:01 -0400642 &fname_crypto_str);
Eric Biggersef1eb3a2016-09-15 17:25:55 -0400643 if (res)
Michael Halcrowb3098482015-04-12 01:07:01 -0400644 printk(KERN_WARNING "Error "
645 "allocating crypto "
646 "buffer--skipping "
647 "crypto\n");
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400648 res = fscrypt_fname_disk_to_usr(dir,
649 0, 0, &de_name,
650 &fname_crypto_str);
Eric Biggersef1eb3a2016-09-15 17:25:55 -0400651 if (res) {
Michael Halcrowb3098482015-04-12 01:07:01 -0400652 printk(KERN_WARNING "Error "
653 "converting filename "
654 "from disk to usr"
655 "\n");
656 name = "??";
657 len = 2;
658 } else {
659 name = fname_crypto_str.name;
660 len = fname_crypto_str.len;
661 }
Theodore Ts'o5de0b4d2015-05-01 16:56:45 -0400662 ext4fs_dirhash(de->name, de->name_len,
663 &h);
Michael Halcrowb3098482015-04-12 01:07:01 -0400664 printk("%*.s:(E)%x.%u ", len, name,
665 h.hash, (unsigned) ((char *) de
666 - base));
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400667 fscrypt_fname_free_buffer(
668 &fname_crypto_str);
Michael Halcrowb3098482015-04-12 01:07:01 -0400669 }
670#else
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700671 int len = de->name_len;
672 char *name = de->name;
Mingming Cao617ba132006-10-11 01:20:53 -0700673 ext4fs_dirhash(de->name, de->name_len, &h);
Michael Halcrowb3098482015-04-12 01:07:01 -0400674 printk("%*.s:%x.%u ", len, name, h.hash,
Bernd Schubert265c6a02011-07-16 19:41:23 -0400675 (unsigned) ((char *) de - base));
Michael Halcrowb3098482015-04-12 01:07:01 -0400676#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677 }
Mingming Cao617ba132006-10-11 01:20:53 -0700678 space += EXT4_DIR_REC_LEN(de->name_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700679 names++;
680 }
Wei Yongjun3d0518f2009-02-14 23:01:36 -0500681 de = ext4_next_entry(de, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700682 }
Joe Perchesd74f3d22016-10-15 09:57:31 -0400683 printk(KERN_CONT "(%i)\n", names);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700684 return (struct stats) { names, space, 1 };
685}
686
687struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
688 struct dx_entry *entries, int levels)
689{
690 unsigned blocksize = dir->i_sb->s_blocksize;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400691 unsigned count = dx_get_count(entries), names = 0, space = 0, i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700692 unsigned bcount = 0;
693 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700694 printk("%i indexed blocks...\n", count);
695 for (i = 0; i < count; i++, entries++)
696 {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500697 ext4_lblk_t block = dx_get_block(entries);
698 ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700699 u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
700 struct stats stats;
701 printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
Theodore Ts'o1c215022014-08-29 20:52:15 -0400702 bh = ext4_bread(NULL,dir, block, 0);
703 if (!bh || IS_ERR(bh))
704 continue;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700705 stats = levels?
706 dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
Michael Halcrowb3098482015-04-12 01:07:01 -0400707 dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
708 bh->b_data, blocksize, 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700709 names += stats.names;
710 space += stats.space;
711 bcount += stats.bcount;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400712 brelse(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700713 }
714 if (bcount)
Theodore Ts'o60e66792010-05-17 07:00:00 -0400715 printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n",
Theodore Ts'o4776004f2008-09-08 23:00:52 -0400716 levels ? "" : " ", names, space/bcount,
717 (space/bcount)*100/blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700718 return (struct stats) { names, space, bcount};
719}
720#endif /* DX_DEBUG */
721
722/*
723 * Probe for a directory leaf block to search.
724 *
725 * dx_probe can return ERR_BAD_DX_DIR, which means there was a format
726 * error in the directory index, and the caller should fall back to
727 * searching the directory normally. The callers of dx_probe **MUST**
728 * check for this error code, and make sure it never gets reflected
729 * back to userspace.
730 */
731static struct dx_frame *
Theodore Ts'o5b643f92015-05-18 13:14:47 -0400732dx_probe(struct ext4_filename *fname, struct inode *dir,
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400733 struct dx_hash_info *hinfo, struct dx_frame *frame_in)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700734{
735 unsigned count, indirect;
736 struct dx_entry *at, *entries, *p, *q, *m;
737 struct dx_root *root;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700738 struct dx_frame *frame = frame_in;
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400739 struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700740 u32 hash;
741
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400742 frame->bh = ext4_read_dirblock(dir, 0, INDEX);
743 if (IS_ERR(frame->bh))
744 return (struct dx_frame *) frame->bh;
745
746 root = (struct dx_root *) frame->bh->b_data;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700747 if (root->info.hash_version != DX_HASH_TEA &&
748 root->info.hash_version != DX_HASH_HALF_MD4 &&
749 root->info.hash_version != DX_HASH_LEGACY) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400750 ext4_warning_inode(dir, "Unrecognised inode hash code %u",
751 root->info.hash_version);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700752 goto fail;
753 }
Theodore Ts'o5b643f92015-05-18 13:14:47 -0400754 if (fname)
755 hinfo = &fname->hinfo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700756 hinfo->hash_version = root->info.hash_version;
Theodore Ts'of99b2582008-10-28 13:21:44 -0400757 if (hinfo->hash_version <= DX_HASH_TEA)
758 hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
Mingming Cao617ba132006-10-11 01:20:53 -0700759 hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
Theodore Ts'o5b643f92015-05-18 13:14:47 -0400760 if (fname && fname_name(fname))
761 ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700762 hash = hinfo->hash;
763
764 if (root->info.unused_flags & 1) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400765 ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
766 root->info.unused_flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700767 goto fail;
768 }
769
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400770 indirect = root->info.indirect_levels;
771 if (indirect > 1) {
772 ext4_warning_inode(dir, "Unimplemented hash depth: %#06x",
773 root->info.indirect_levels);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700774 goto fail;
775 }
776
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400777 entries = (struct dx_entry *)(((char *)&root->info) +
778 root->info.info_length);
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700779
780 if (dx_get_limit(entries) != dx_root_limit(dir,
781 root->info.info_length)) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400782 ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
783 dx_get_limit(entries),
784 dx_root_limit(dir, root->info.info_length));
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700785 goto fail;
786 }
787
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400788 dxtrace(printk("Look up %x", hash));
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400789 while (1) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790 count = dx_get_count(entries);
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700791 if (!count || count > dx_get_limit(entries)) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400792 ext4_warning_inode(dir,
793 "dx entry: count %u beyond limit %u",
794 count, dx_get_limit(entries));
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400795 goto fail;
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700796 }
797
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700798 p = entries + 1;
799 q = entries + count - 1;
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400800 while (p <= q) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400801 m = p + (q - p) / 2;
Joe Perchesd74f3d22016-10-15 09:57:31 -0400802 dxtrace(printk(KERN_CONT "."));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700803 if (dx_get_hash(m) > hash)
804 q = m - 1;
805 else
806 p = m + 1;
807 }
808
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400809 if (0) { // linear search cross check
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700810 unsigned n = count - 1;
811 at = entries;
812 while (n--)
813 {
Joe Perchesd74f3d22016-10-15 09:57:31 -0400814 dxtrace(printk(KERN_CONT ","));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700815 if (dx_get_hash(++at) > hash)
816 {
817 at--;
818 break;
819 }
820 }
821 assert (at == p - 1);
822 }
823
824 at = p - 1;
Joe Perchesd74f3d22016-10-15 09:57:31 -0400825 dxtrace(printk(KERN_CONT " %x->%u\n",
826 at == entries ? 0 : dx_get_hash(at),
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400827 dx_get_block(at)));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700828 frame->entries = entries;
829 frame->at = at;
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400830 if (!indirect--)
831 return frame;
832 frame++;
833 frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
834 if (IS_ERR(frame->bh)) {
835 ret_err = (struct dx_frame *) frame->bh;
836 frame->bh = NULL;
837 goto fail;
Carlos Maiolino6d1ab102012-09-27 09:31:33 -0400838 }
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400839 entries = ((struct dx_node *) frame->bh->b_data)->entries;
Darrick J. Wongdbe89442012-04-29 18:39:10 -0400840
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400841 if (dx_get_limit(entries) != dx_node_limit(dir)) {
842 ext4_warning_inode(dir,
843 "dx entry: limit %u != node limit %u",
844 dx_get_limit(entries), dx_node_limit(dir));
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400845 goto fail;
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700846 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847 }
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400848fail:
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700849 while (frame >= frame_in) {
850 brelse(frame->bh);
851 frame--;
852 }
Michael Halcrowb3098482015-04-12 01:07:01 -0400853
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400854 if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400855 ext4_warning_inode(dir,
856 "Corrupt directory, running e2fsck is recommended");
Theodore Ts'odd73b5d2014-08-29 20:52:17 -0400857 return ret_err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700858}
859
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400860static void dx_release(struct dx_frame *frames)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700861{
862 if (frames[0].bh == NULL)
863 return;
864
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400865 if (((struct dx_root *)frames[0].bh->b_data)->info.indirect_levels)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700866 brelse(frames[1].bh);
867 brelse(frames[0].bh);
868}
869
870/*
871 * This function increments the frame pointer to search the next leaf
872 * block, and reads in the necessary intervening nodes if the search
873 * should be necessary. Whether or not the search is necessary is
874 * controlled by the hash parameter. If the hash value is even, then
875 * the search is only continued if the next block starts with that
876 * hash value. This is used if we are searching for a specific file.
877 *
878 * If the hash value is HASH_NB_ALWAYS, then always go to the next block.
879 *
880 * This function returns 1 if the caller should continue to search,
881 * or 0 if it should not. If there is an error reading one of the
882 * index blocks, it will a negative error code.
883 *
884 * If start_hash is non-null, it will be filled in with the starting
885 * hash of the next page.
886 */
Mingming Cao617ba132006-10-11 01:20:53 -0700887static int ext4_htree_next_block(struct inode *dir, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700888 struct dx_frame *frame,
889 struct dx_frame *frames,
890 __u32 *start_hash)
891{
892 struct dx_frame *p;
893 struct buffer_head *bh;
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500894 int num_frames = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700895 __u32 bhash;
896
897 p = frame;
898 /*
899 * Find the next leaf page by incrementing the frame pointer.
900 * If we run out of entries in the interior node, loop around and
901 * increment pointer in the parent node. When we break out of
902 * this loop, num_frames indicates the number of interior
903 * nodes need to be read.
904 */
905 while (1) {
906 if (++(p->at) < p->entries + dx_get_count(p->entries))
907 break;
908 if (p == frames)
909 return 0;
910 num_frames++;
911 p--;
912 }
913
914 /*
915 * If the hash is 1, then continue only if the next page has a
916 * continuation hash of any value. This is used for readdir
917 * handling. Otherwise, check to see if the hash matches the
918 * desired contiuation hash. If it doesn't, return since
919 * there's no point to read in the successive index pages.
920 */
921 bhash = dx_get_hash(p->at);
922 if (start_hash)
923 *start_hash = bhash;
924 if ((hash & 1) == 0) {
925 if ((bhash & ~1) != hash)
926 return 0;
927 }
928 /*
929 * If the hash is HASH_NB_ALWAYS, we always go to the next
930 * block so no check is necessary
931 */
932 while (num_frames--) {
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500933 bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX);
934 if (IS_ERR(bh))
935 return PTR_ERR(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700936 p++;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400937 brelse(p->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700938 p->bh = bh;
939 p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
940 }
941 return 1;
942}
943
944
945/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700946 * This function fills a red-black tree with information from a
947 * directory block. It returns the number directory entries loaded
948 * into the tree. If there is an error it is returned in err.
949 */
950static int htree_dirblock_to_tree(struct file *dir_file,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500951 struct inode *dir, ext4_lblk_t block,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700952 struct dx_hash_info *hinfo,
953 __u32 start_hash, __u32 start_minor_hash)
954{
955 struct buffer_head *bh;
Mingming Cao617ba132006-10-11 01:20:53 -0700956 struct ext4_dir_entry_2 *de, *top;
Carlos Maiolino90b0a972012-09-17 23:39:12 -0400957 int err = 0, count = 0;
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400958 struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700959
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500960 dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
961 (unsigned long)block));
Theodore Ts'odc6982f2013-02-14 23:59:26 -0500962 bh = ext4_read_dirblock(dir, block, DIRENT);
963 if (IS_ERR(bh))
964 return PTR_ERR(bh);
Darrick J. Wongb0336e82012-04-29 18:41:10 -0400965
Mingming Cao617ba132006-10-11 01:20:53 -0700966 de = (struct ext4_dir_entry_2 *) bh->b_data;
967 top = (struct ext4_dir_entry_2 *) ((char *) de +
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700968 dir->i_sb->s_blocksize -
Mingming Cao617ba132006-10-11 01:20:53 -0700969 EXT4_DIR_REC_LEN(0));
Michael Halcrow1f3862b2015-04-12 01:09:03 -0400970#ifdef CONFIG_EXT4_FS_ENCRYPTION
971 /* Check if the directory is encrypted */
Theodore Ts'ob7236e22015-05-18 13:17:47 -0400972 if (ext4_encrypted_inode(dir)) {
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400973 err = fscrypt_get_encryption_info(dir);
Theodore Ts'oc936e1e2015-05-31 13:34:22 -0400974 if (err < 0) {
975 brelse(bh);
976 return err;
977 }
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400978 err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN,
Michael Halcrow1f3862b2015-04-12 01:09:03 -0400979 &fname_crypto_str);
980 if (err < 0) {
Michael Halcrow1f3862b2015-04-12 01:09:03 -0400981 brelse(bh);
982 return err;
983 }
984 }
985#endif
Wei Yongjun3d0518f2009-02-14 23:01:36 -0500986 for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
Theodore Ts'of7c21172011-01-10 12:10:55 -0500987 if (ext4_check_dir_entry(dir, NULL, de, bh,
Tao Ma226ba972012-12-10 14:05:58 -0500988 bh->b_data, bh->b_size,
Theodore Ts'ocad3f002010-12-19 22:07:02 -0500989 (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
990 + ((char *)de - bh->b_data))) {
Al Viro64cb9272013-07-01 08:12:38 -0400991 /* silently ignore the rest of the block */
992 break;
Eric Sandeene6c40212006-12-06 20:36:28 -0800993 }
Mingming Cao617ba132006-10-11 01:20:53 -0700994 ext4fs_dirhash(de->name, de->name_len, hinfo);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700995 if ((hinfo->hash < start_hash) ||
996 ((hinfo->hash == start_hash) &&
997 (hinfo->minor_hash < start_minor_hash)))
998 continue;
999 if (de->inode == 0)
1000 continue;
Theodore Ts'ob7236e22015-05-18 13:17:47 -04001001 if (!ext4_encrypted_inode(dir)) {
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001002 tmp_str.name = de->name;
1003 tmp_str.len = de->name_len;
1004 err = ext4_htree_store_dirent(dir_file,
1005 hinfo->hash, hinfo->minor_hash, de,
1006 &tmp_str);
1007 } else {
Theodore Ts'od2299592015-05-18 13:15:47 -04001008 int save_len = fname_crypto_str.len;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001009 struct fscrypt_str de_name = FSTR_INIT(de->name,
1010 de->name_len);
Theodore Ts'od2299592015-05-18 13:15:47 -04001011
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001012 /* Directory is encrypted */
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001013 err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
1014 hinfo->minor_hash, &de_name,
1015 &fname_crypto_str);
Eric Biggersef1eb3a2016-09-15 17:25:55 -04001016 if (err) {
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001017 count = err;
1018 goto errout;
1019 }
1020 err = ext4_htree_store_dirent(dir_file,
1021 hinfo->hash, hinfo->minor_hash, de,
1022 &fname_crypto_str);
Theodore Ts'od2299592015-05-18 13:15:47 -04001023 fname_crypto_str.len = save_len;
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001024 }
Theodore Ts'o2f618302015-04-12 00:56:26 -04001025 if (err != 0) {
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001026 count = err;
1027 goto errout;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001028 }
1029 count++;
1030 }
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001031errout:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001032 brelse(bh);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001033#ifdef CONFIG_EXT4_FS_ENCRYPTION
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001034 fscrypt_fname_free_buffer(&fname_crypto_str);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001035#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001036 return count;
1037}
1038
1039
1040/*
1041 * This function fills a red-black tree with information from a
1042 * directory. We start scanning the directory in hash order, starting
1043 * at start_hash and start_minor_hash.
1044 *
1045 * This function returns the number of entries inserted into the tree,
1046 * or a negative error code.
1047 */
Mingming Cao617ba132006-10-11 01:20:53 -07001048int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001049 __u32 start_minor_hash, __u32 *next_hash)
1050{
1051 struct dx_hash_info hinfo;
Mingming Cao617ba132006-10-11 01:20:53 -07001052 struct ext4_dir_entry_2 *de;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001053 struct dx_frame frames[2], *frame;
1054 struct inode *dir;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001055 ext4_lblk_t block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001056 int count = 0;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001057 int ret, err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001058 __u32 hashval;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001059 struct fscrypt_str tmp_str;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001060
Theodore Ts'o60e66792010-05-17 07:00:00 -04001061 dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001062 start_hash, start_minor_hash));
Al Viro496ad9a2013-01-23 17:07:38 -05001063 dir = file_inode(dir_file);
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001064 if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) {
Mingming Cao617ba132006-10-11 01:20:53 -07001065 hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
Theodore Ts'of99b2582008-10-28 13:21:44 -04001066 if (hinfo.hash_version <= DX_HASH_TEA)
1067 hinfo.hash_version +=
1068 EXT4_SB(dir->i_sb)->s_hash_unsigned;
Mingming Cao617ba132006-10-11 01:20:53 -07001069 hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
Tao Ma8af0f082013-04-19 17:53:09 -04001070 if (ext4_has_inline_data(dir)) {
1071 int has_inline_data = 1;
1072 count = htree_inlinedir_to_tree(dir_file, dir, 0,
1073 &hinfo, start_hash,
1074 start_minor_hash,
1075 &has_inline_data);
1076 if (has_inline_data) {
1077 *next_hash = ~0;
1078 return count;
1079 }
1080 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001081 count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
1082 start_hash, start_minor_hash);
1083 *next_hash = ~0;
1084 return count;
1085 }
1086 hinfo.hash = start_hash;
1087 hinfo.minor_hash = 0;
Theodore Ts'odd73b5d2014-08-29 20:52:17 -04001088 frame = dx_probe(NULL, dir, &hinfo, frames);
1089 if (IS_ERR(frame))
1090 return PTR_ERR(frame);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001091
1092 /* Add '.' and '..' from the htree header */
1093 if (!start_hash && !start_minor_hash) {
Mingming Cao617ba132006-10-11 01:20:53 -07001094 de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
Theodore Ts'o2f618302015-04-12 00:56:26 -04001095 tmp_str.name = de->name;
1096 tmp_str.len = de->name_len;
1097 err = ext4_htree_store_dirent(dir_file, 0, 0,
1098 de, &tmp_str);
1099 if (err != 0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100 goto errout;
1101 count++;
1102 }
1103 if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001104 de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001105 de = ext4_next_entry(de, dir->i_sb->s_blocksize);
Theodore Ts'o2f618302015-04-12 00:56:26 -04001106 tmp_str.name = de->name;
1107 tmp_str.len = de->name_len;
1108 err = ext4_htree_store_dirent(dir_file, 2, 0,
1109 de, &tmp_str);
1110 if (err != 0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001111 goto errout;
1112 count++;
1113 }
1114
1115 while (1) {
Theodore Ts'o1f60fbe2016-04-23 22:50:07 -04001116 if (fatal_signal_pending(current)) {
1117 err = -ERESTARTSYS;
1118 goto errout;
1119 }
1120 cond_resched();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001121 block = dx_get_block(frame->at);
1122 ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
1123 start_hash, start_minor_hash);
1124 if (ret < 0) {
1125 err = ret;
1126 goto errout;
1127 }
1128 count += ret;
1129 hashval = ~0;
Mingming Cao617ba132006-10-11 01:20:53 -07001130 ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001131 frame, frames, &hashval);
1132 *next_hash = hashval;
1133 if (ret < 0) {
1134 err = ret;
1135 goto errout;
1136 }
1137 /*
1138 * Stop if: (a) there are no more entries, or
1139 * (b) we have inserted at least one entry and the
1140 * next hash value is not a continuation
1141 */
1142 if ((ret == 0) ||
1143 (count && ((hashval & 1) == 0)))
1144 break;
1145 }
1146 dx_release(frames);
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001147 dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
1148 "next hash: %x\n", count, *next_hash));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001149 return count;
1150errout:
1151 dx_release(frames);
1152 return (err);
1153}
1154
Tao Ma7335cd32012-12-10 14:05:59 -05001155static inline int search_dirblock(struct buffer_head *bh,
1156 struct inode *dir,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001157 struct ext4_filename *fname,
Tao Ma7335cd32012-12-10 14:05:59 -05001158 const struct qstr *d_name,
1159 unsigned int offset,
1160 struct ext4_dir_entry_2 **res_dir)
1161{
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001162 return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir,
1163 fname, d_name, offset, res_dir);
Tao Ma7335cd32012-12-10 14:05:59 -05001164}
1165
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001166/*
1167 * Directory block splitting, compacting
1168 */
1169
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001170/*
1171 * Create map of hash values, offsets, and sizes, stored at end of block.
1172 * Returns number of entries mapped.
1173 */
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001174static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
1175 unsigned blocksize, struct dx_hash_info *hinfo,
Theodore Ts'o8bad4592009-02-14 21:46:54 -05001176 struct dx_map_entry *map_tail)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001177{
1178 int count = 0;
1179 char *base = (char *) de;
1180 struct dx_hash_info h = *hinfo;
1181
Theodore Ts'o8bad4592009-02-14 21:46:54 -05001182 while ((char *) de < base + blocksize) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001183 if (de->name_len && de->inode) {
Mingming Cao617ba132006-10-11 01:20:53 -07001184 ext4fs_dirhash(de->name, de->name_len, &h);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001185 map_tail--;
1186 map_tail->hash = h.hash;
Toshiyuki Okajima9aee2282009-06-08 12:41:35 -04001187 map_tail->offs = ((char *) de - base)>>2;
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001188 map_tail->size = le16_to_cpu(de->rec_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001189 count++;
1190 cond_resched();
1191 }
1192 /* XXX: do we need to check rec_len == 0 case? -Chris */
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001193 de = ext4_next_entry(de, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001194 }
1195 return count;
1196}
1197
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001198/* Sort map by hash value */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001199static void dx_sort_map (struct dx_map_entry *map, unsigned count)
1200{
Andrew Morton63f57932006-10-11 01:21:24 -07001201 struct dx_map_entry *p, *q, *top = map + count - 1;
1202 int more;
1203 /* Combsort until bubble sort doesn't suck */
1204 while (count > 2) {
1205 count = count*10/13;
1206 if (count - 9 < 2) /* 9, 10 -> 11 */
1207 count = 11;
1208 for (p = top, q = p - count; q >= map; p--, q--)
1209 if (p->hash < q->hash)
1210 swap(*p, *q);
1211 }
1212 /* Garden variety bubble sort */
1213 do {
1214 more = 0;
1215 q = top;
1216 while (q-- > map) {
1217 if (q[1].hash >= q[0].hash)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001218 continue;
Andrew Morton63f57932006-10-11 01:21:24 -07001219 swap(*(q+1), *q);
1220 more = 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001221 }
1222 } while(more);
1223}
1224
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001225static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001226{
1227 struct dx_entry *entries = frame->entries;
1228 struct dx_entry *old = frame->at, *new = old + 1;
1229 int count = dx_get_count(entries);
1230
1231 assert(count < dx_get_limit(entries));
1232 assert(old < entries + count);
1233 memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
1234 dx_set_hash(new, hash);
1235 dx_set_block(new, block);
1236 dx_set_count(entries, count + 1);
1237}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001238
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001239/*
Mingming Cao617ba132006-10-11 01:20:53 -07001240 * NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001241 *
Mingming Cao617ba132006-10-11 01:20:53 -07001242 * `len <= EXT4_NAME_LEN' is guaranteed by caller.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001243 * `de != NULL' is guaranteed by caller.
1244 */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001245static inline int ext4_match(struct ext4_filename *fname,
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001246 struct ext4_dir_entry_2 *de)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001247{
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001248 const void *name = fname_name(fname);
1249 u32 len = fname_len(fname);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001250
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001251 if (!de->inode)
1252 return 0;
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001253
1254#ifdef CONFIG_EXT4_FS_ENCRYPTION
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001255 if (unlikely(!name)) {
1256 if (fname->usr_fname->name[0] == '_') {
1257 int ret;
Eric Biggersaf9bd522017-04-24 10:00:09 -07001258 if (de->name_len <= 32)
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001259 return 0;
Eric Biggersaf9bd522017-04-24 10:00:09 -07001260 ret = memcmp(de->name + ((de->name_len - 17) & ~15),
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001261 fname->crypto_buf.name + 8, 16);
1262 return (ret == 0) ? 1 : 0;
1263 }
1264 name = fname->crypto_buf.name;
1265 len = fname->crypto_buf.len;
1266 }
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001267#endif
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001268 if (de->name_len != len)
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001269 return 0;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001270 return (memcmp(de->name, name, len) == 0) ? 1 : 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001271}
1272
1273/*
1274 * Returns 0 if not found, -1 on failure, and 1 on success
1275 */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001276int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
1277 struct inode *dir, struct ext4_filename *fname,
1278 const struct qstr *d_name,
1279 unsigned int offset, struct ext4_dir_entry_2 **res_dir)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001280{
Mingming Cao617ba132006-10-11 01:20:53 -07001281 struct ext4_dir_entry_2 * de;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001282 char * dlimit;
1283 int de_len;
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001284 int res;
1285
Tao Ma7335cd32012-12-10 14:05:59 -05001286 de = (struct ext4_dir_entry_2 *)search_buf;
1287 dlimit = search_buf + buf_size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001288 while ((char *) de < dlimit) {
1289 /* this code is executed quadratically often */
1290 /* do minimal checking `by hand' */
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001291 if ((char *) de + de->name_len <= dlimit) {
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001292 res = ext4_match(fname, de);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001293 if (res < 0) {
1294 res = -1;
1295 goto return_result;
1296 }
1297 if (res > 0) {
1298 /* found a match - just to be sure, do
1299 * a full check */
1300 if (ext4_check_dir_entry(dir, NULL, de, bh,
1301 bh->b_data,
1302 bh->b_size, offset)) {
1303 res = -1;
1304 goto return_result;
1305 }
1306 *res_dir = de;
1307 res = 1;
1308 goto return_result;
1309 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001310
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001311 }
1312 /* prevent looping on a bad block */
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001313 de_len = ext4_rec_len_from_disk(de->rec_len,
1314 dir->i_sb->s_blocksize);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001315 if (de_len <= 0) {
1316 res = -1;
1317 goto return_result;
1318 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001319 offset += de_len;
Mingming Cao617ba132006-10-11 01:20:53 -07001320 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001321 }
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001322
1323 res = 0;
1324return_result:
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001325 return res;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001326}
1327
Darrick J. Wongc6af8802012-11-12 23:51:02 -05001328static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
1329 struct ext4_dir_entry *de)
1330{
1331 struct super_block *sb = dir->i_sb;
1332
1333 if (!is_dx(dir))
1334 return 0;
1335 if (block == 0)
1336 return 1;
1337 if (de->inode == 0 &&
1338 ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) ==
1339 sb->s_blocksize)
1340 return 1;
1341 return 0;
1342}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001343
1344/*
Mingming Cao617ba132006-10-11 01:20:53 -07001345 * ext4_find_entry()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001346 *
1347 * finds an entry in the specified directory with the wanted name. It
1348 * returns the cache buffer in which the entry was found, and the entry
1349 * itself (as a parameter - res_dir). It does NOT read the inode of the
1350 * entry - you'll have to do that yourself if you want to.
1351 *
1352 * The returned buffer_head has ->b_count elevated. The caller is expected
1353 * to brelse() it when appropriate.
1354 */
Theodore Ts'of702ba02008-09-22 15:21:01 -04001355static struct buffer_head * ext4_find_entry (struct inode *dir,
1356 const struct qstr *d_name,
Tao Ma32f7f222012-12-10 14:06:01 -05001357 struct ext4_dir_entry_2 **res_dir,
1358 int *inlined)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001359{
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001360 struct super_block *sb;
1361 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1362 struct buffer_head *bh, *ret = NULL;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001363 ext4_lblk_t start, block, b;
Theodore Ts'o8941ec82010-10-27 21:30:08 -04001364 const u8 *name = d_name->name;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001365 int ra_max = 0; /* Number of bh's in the readahead
1366 buffer, bh_use[] */
1367 int ra_ptr = 0; /* Current index into readahead
1368 buffer */
1369 int num = 0;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001370 ext4_lblk_t nblocks;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001371 int i, namelen, retval;
1372 struct ext4_filename fname;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001373
1374 *res_dir = NULL;
1375 sb = dir->i_sb;
Theodore Ts'of702ba02008-09-22 15:21:01 -04001376 namelen = d_name->len;
Mingming Cao617ba132006-10-11 01:20:53 -07001377 if (namelen > EXT4_NAME_LEN)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001378 return NULL;
Tao Mae8e948e2012-12-10 14:06:00 -05001379
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001380 retval = ext4_fname_setup_filename(dir, d_name, 1, &fname);
Eric Biggersd612bee2016-12-05 11:12:44 -08001381 if (retval == -ENOENT)
1382 return NULL;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001383 if (retval)
1384 return ERR_PTR(retval);
1385
Tao Mae8e948e2012-12-10 14:06:00 -05001386 if (ext4_has_inline_data(dir)) {
1387 int has_inline_data = 1;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001388 ret = ext4_find_inline_entry(dir, &fname, d_name, res_dir,
Tao Mae8e948e2012-12-10 14:06:00 -05001389 &has_inline_data);
Tao Ma32f7f222012-12-10 14:06:01 -05001390 if (has_inline_data) {
1391 if (inlined)
1392 *inlined = 1;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001393 goto cleanup_and_exit;
Tao Ma32f7f222012-12-10 14:06:01 -05001394 }
Tao Mae8e948e2012-12-10 14:06:00 -05001395 }
1396
Theodore Ts'o8941ec82010-10-27 21:30:08 -04001397 if ((namelen <= 2) && (name[0] == '.') &&
Aaro Koskinen6d5c3aa2010-12-14 21:45:31 -05001398 (name[1] == '.' || name[1] == '\0')) {
Theodore Ts'o8941ec82010-10-27 21:30:08 -04001399 /*
1400 * "." or ".." will only be in the first block
1401 * NFS may look up ".."; "." should be handled by the VFS
1402 */
1403 block = start = 0;
1404 nblocks = 1;
1405 goto restart;
1406 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001407 if (is_dx(dir)) {
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001408 ret = ext4_dx_find_entry(dir, &fname, res_dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001409 /*
1410 * On success, or if the error was file not found,
1411 * return. Otherwise, fall back to doing a search the
1412 * old fashioned way.
1413 */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001414 if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR)
1415 goto cleanup_and_exit;
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001416 dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
1417 "falling back\n"));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001418 }
Mingming Cao617ba132006-10-11 01:20:53 -07001419 nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
Chandan Rajendra32e2ae02017-12-11 15:00:57 -05001420 if (!nblocks) {
1421 ret = NULL;
1422 goto cleanup_and_exit;
1423 }
Mingming Cao617ba132006-10-11 01:20:53 -07001424 start = EXT4_I(dir)->i_dir_start_lookup;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001425 if (start >= nblocks)
1426 start = 0;
1427 block = start;
1428restart:
1429 do {
1430 /*
1431 * We deal with the read-ahead logic here.
1432 */
1433 if (ra_ptr >= ra_max) {
1434 /* Refill the readahead buffer */
1435 ra_ptr = 0;
1436 b = block;
1437 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1438 /*
1439 * Terminate if we reach the end of the
1440 * directory and must wrap, or if our
1441 * search has finished at this block.
1442 */
1443 if (b >= nblocks || (num && block == start)) {
1444 bh_use[ra_max] = NULL;
1445 break;
1446 }
1447 num++;
Theodore Ts'o10560082014-08-29 20:51:32 -04001448 bh = ext4_getblk(NULL, dir, b++, 0);
Viresh Kumara1c83682015-08-12 15:59:44 +05301449 if (IS_ERR(bh)) {
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001450 if (ra_max == 0) {
1451 ret = bh;
1452 goto cleanup_and_exit;
1453 }
Theodore Ts'o36de9282014-08-23 17:47:19 -04001454 break;
1455 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001456 bh_use[ra_max] = bh;
1457 if (bh)
Mike Christiedfec8a12016-06-05 14:31:44 -05001458 ll_rw_block(REQ_OP_READ,
1459 REQ_META | REQ_PRIO,
Christoph Hellwig65299a32011-08-23 14:50:29 +02001460 1, &bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001461 }
1462 }
1463 if ((bh = bh_use[ra_ptr++]) == NULL)
1464 goto next;
1465 wait_on_buffer(bh);
1466 if (!buffer_uptodate(bh)) {
1467 /* read error, skip block & hope for the best */
Theodore Ts'o24676da2010-05-16 21:00:00 -04001468 EXT4_ERROR_INODE(dir, "reading directory lblock %lu",
1469 (unsigned long) block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001470 brelse(bh);
1471 goto next;
1472 }
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001473 if (!buffer_verified(bh) &&
Darrick J. Wongc6af8802012-11-12 23:51:02 -05001474 !is_dx_internal_node(dir, block,
1475 (struct ext4_dir_entry *)bh->b_data) &&
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001476 !ext4_dirent_csum_verify(dir,
1477 (struct ext4_dir_entry *)bh->b_data)) {
1478 EXT4_ERROR_INODE(dir, "checksumming directory "
1479 "block %lu", (unsigned long)block);
1480 brelse(bh);
1481 goto next;
1482 }
1483 set_buffer_verified(bh);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001484 i = search_dirblock(bh, dir, &fname, d_name,
Mingming Cao617ba132006-10-11 01:20:53 -07001485 block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001486 if (i == 1) {
Mingming Cao617ba132006-10-11 01:20:53 -07001487 EXT4_I(dir)->i_dir_start_lookup = block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001488 ret = bh;
1489 goto cleanup_and_exit;
1490 } else {
1491 brelse(bh);
1492 if (i < 0)
1493 goto cleanup_and_exit;
1494 }
1495 next:
1496 if (++block >= nblocks)
1497 block = 0;
1498 } while (block != start);
1499
1500 /*
1501 * If the directory has grown while we were searching, then
1502 * search the last part of the directory before giving up.
1503 */
1504 block = nblocks;
Mingming Cao617ba132006-10-11 01:20:53 -07001505 nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001506 if (block < nblocks) {
1507 start = 0;
1508 goto restart;
1509 }
1510
1511cleanup_and_exit:
1512 /* Clean up the read-ahead blocks */
1513 for (; ra_ptr < ra_max; ra_ptr++)
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001514 brelse(bh_use[ra_ptr]);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001515 ext4_fname_free_filename(&fname);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001516 return ret;
1517}
1518
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001519static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
1520 struct ext4_filename *fname,
1521 struct ext4_dir_entry_2 **res_dir)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001522{
Theodore Ts'o8941ec82010-10-27 21:30:08 -04001523 struct super_block * sb = dir->i_sb;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001524 struct dx_frame frames[2], *frame;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001525 const struct qstr *d_name = fname->usr_fname;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001526 struct buffer_head *bh;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001527 ext4_lblk_t block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001528 int retval;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001529
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001530#ifdef CONFIG_EXT4_FS_ENCRYPTION
1531 *res_dir = NULL;
1532#endif
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001533 frame = dx_probe(fname, dir, NULL, frames);
Theodore Ts'odd73b5d2014-08-29 20:52:17 -04001534 if (IS_ERR(frame))
1535 return (struct buffer_head *) frame;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001536 do {
1537 block = dx_get_block(frame->at);
Theodore Ts'odc6982f2013-02-14 23:59:26 -05001538 bh = ext4_read_dirblock(dir, block, DIRENT);
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001539 if (IS_ERR(bh))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001540 goto errout;
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001541
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001542 retval = search_dirblock(bh, dir, fname, d_name,
Theodore Ts'o7845c042010-10-27 21:30:08 -04001543 block << EXT4_BLOCK_SIZE_BITS(sb),
1544 res_dir);
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001545 if (retval == 1)
1546 goto success;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001547 brelse(bh);
Theodore Ts'o7845c042010-10-27 21:30:08 -04001548 if (retval == -1) {
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001549 bh = ERR_PTR(ERR_BAD_DX_DIR);
Theodore Ts'o7845c042010-10-27 21:30:08 -04001550 goto errout;
1551 }
1552
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001553 /* Check to see if we should continue to search */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001554 retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001555 frames, NULL);
1556 if (retval < 0) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04001557 ext4_warning_inode(dir,
1558 "error %d reading directory index block",
1559 retval);
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001560 bh = ERR_PTR(retval);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001561 goto errout;
1562 }
1563 } while (retval == 1);
1564
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001565 bh = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001566errout:
Bernd Schubert265c6a02011-07-16 19:41:23 -04001567 dxtrace(printk(KERN_DEBUG "%s not found\n", d_name->name));
Theodore Ts'o537d8f92014-08-29 20:49:51 -04001568success:
1569 dx_release(frames);
1570 return bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001571}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001572
Al Viro00cd8dd2012-06-10 17:13:09 -04001573static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001574{
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001575 struct inode *inode;
1576 struct ext4_dir_entry_2 *de;
1577 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001578
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001579 if (ext4_encrypted_inode(dir)) {
1580 int res = fscrypt_get_encryption_info(dir);
Theodore Ts'o28b4c262016-02-07 19:35:05 -05001581
1582 /*
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001583 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
Theodore Ts'o28b4c262016-02-07 19:35:05 -05001584 * created while the directory was encrypted and we
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001585 * have access to the key.
Theodore Ts'o28b4c262016-02-07 19:35:05 -05001586 */
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001587 if (fscrypt_has_encryption_key(dir))
1588 fscrypt_set_encrypted_dentry(dentry);
1589 fscrypt_set_d_op(dentry);
1590 if (res && res != -ENOKEY)
1591 return ERR_PTR(res);
1592 }
Theodore Ts'o28b4c262016-02-07 19:35:05 -05001593
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001594 if (dentry->d_name.len > EXT4_NAME_LEN)
1595 return ERR_PTR(-ENAMETOOLONG);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001596
Tao Ma32f7f222012-12-10 14:06:01 -05001597 bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
Theodore Ts'o36de9282014-08-23 17:47:19 -04001598 if (IS_ERR(bh))
1599 return (struct dentry *) bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001600 inode = NULL;
1601 if (bh) {
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001602 __u32 ino = le32_to_cpu(de->inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001603 brelse(bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001604 if (!ext4_valid_inum(dir->i_sb, ino)) {
Theodore Ts'o24676da2010-05-16 21:00:00 -04001605 EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001606 return ERR_PTR(-EFSCORRUPTED);
Vasily Averina6c15c22007-07-15 23:40:46 -07001607 }
Andreas Dilger7e936b72012-05-28 17:02:25 -04001608 if (unlikely(ino == dir->i_ino)) {
David Howellsa34e15c2014-01-06 14:04:23 -05001609 EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir",
1610 dentry);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001611 return ERR_PTR(-EFSCORRUPTED);
Andreas Dilger7e936b72012-05-28 17:02:25 -04001612 }
Theodore Ts'of4bb2982014-10-05 22:56:00 -04001613 inode = ext4_iget_normal(dir->i_sb, ino);
Al Viroa9049372011-07-08 21:20:11 -04001614 if (inode == ERR_PTR(-ESTALE)) {
1615 EXT4_ERROR_INODE(dir,
1616 "deleted inode referenced: %u",
1617 ino);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001618 return ERR_PTR(-EFSCORRUPTED);
Bryan Donlane6f009b2009-02-22 21:20:25 -05001619 }
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04001620 if (!IS_ERR(inode) && ext4_encrypted_inode(dir) &&
Theodore Ts'off978b02016-02-08 00:54:26 -05001621 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001622 !fscrypt_has_permitted_context(dir, inode)) {
Theodore Ts'off978b02016-02-08 00:54:26 -05001623 int nokey = ext4_encrypted_inode(inode) &&
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001624 !fscrypt_has_encryption_key(inode);
Eric Biggers68ca0fd2017-02-01 21:07:11 -05001625 if (nokey) {
1626 iput(inode);
Theodore Ts'off978b02016-02-08 00:54:26 -05001627 return ERR_PTR(-ENOKEY);
Eric Biggers68ca0fd2017-02-01 21:07:11 -05001628 }
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04001629 ext4_warning(inode->i_sb,
Jakub Wilk8d2ae1c2016-04-27 01:11:21 -04001630 "Inconsistent encryption contexts: %lu/%lu",
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04001631 (unsigned long) dir->i_ino,
1632 (unsigned long) inode->i_ino);
Eric Biggers68ca0fd2017-02-01 21:07:11 -05001633 iput(inode);
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04001634 return ERR_PTR(-EPERM);
1635 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001636 }
1637 return d_splice_alias(inode, dentry);
1638}
1639
1640
Mingming Cao617ba132006-10-11 01:20:53 -07001641struct dentry *ext4_get_parent(struct dentry *child)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001642{
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001643 __u32 ino;
Linus Torvalds26fe5752012-05-10 13:14:12 -07001644 static const struct qstr dotdot = QSTR_INIT("..", 2);
Mingming Cao617ba132006-10-11 01:20:53 -07001645 struct ext4_dir_entry_2 * de;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001646 struct buffer_head *bh;
1647
David Howells2b0143b2015-03-17 22:25:59 +00001648 bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL);
Theodore Ts'o36de9282014-08-23 17:47:19 -04001649 if (IS_ERR(bh))
1650 return (struct dentry *) bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001651 if (!bh)
1652 return ERR_PTR(-ENOENT);
1653 ino = le32_to_cpu(de->inode);
1654 brelse(bh);
1655
Al Virofc640052016-04-10 01:33:30 -04001656 if (!ext4_valid_inum(child->d_sb, ino)) {
David Howells2b0143b2015-03-17 22:25:59 +00001657 EXT4_ERROR_INODE(d_inode(child),
Theodore Ts'o24676da2010-05-16 21:00:00 -04001658 "bad parent inode number: %u", ino);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001659 return ERR_PTR(-EFSCORRUPTED);
Vasily Averina6c15c22007-07-15 23:40:46 -07001660 }
1661
Al Virofc640052016-04-10 01:33:30 -04001662 return d_obtain_alias(ext4_iget_normal(child->d_sb, ino));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001663}
1664
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001665/*
1666 * Move count entries from end of map between two memory locations.
1667 * Returns pointer to last entry moved.
1668 */
Mingming Cao617ba132006-10-11 01:20:53 -07001669static struct ext4_dir_entry_2 *
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001670dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count,
1671 unsigned blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001672{
1673 unsigned rec_len = 0;
1674
1675 while (count--) {
Theodore Ts'o60e66792010-05-17 07:00:00 -04001676 struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
Toshiyuki Okajima9aee2282009-06-08 12:41:35 -04001677 (from + (map->offs<<2));
Mingming Cao617ba132006-10-11 01:20:53 -07001678 rec_len = EXT4_DIR_REC_LEN(de->name_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001679 memcpy (to, de, rec_len);
Mingming Cao617ba132006-10-11 01:20:53 -07001680 ((struct ext4_dir_entry_2 *) to)->rec_len =
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001681 ext4_rec_len_to_disk(rec_len, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001682 de->inode = 0;
1683 map++;
1684 to += rec_len;
1685 }
Mingming Cao617ba132006-10-11 01:20:53 -07001686 return (struct ext4_dir_entry_2 *) (to - rec_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001687}
1688
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001689/*
1690 * Compact each dir entry in the range to the minimal rec_len.
1691 * Returns pointer to last entry in range.
1692 */
Theodore Ts'o8bad4592009-02-14 21:46:54 -05001693static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001694{
Mingming Cao617ba132006-10-11 01:20:53 -07001695 struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001696 unsigned rec_len = 0;
1697
1698 prev = to = de;
Theodore Ts'o8bad4592009-02-14 21:46:54 -05001699 while ((char*)de < base + blocksize) {
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001700 next = ext4_next_entry(de, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001701 if (de->inode && de->name_len) {
Mingming Cao617ba132006-10-11 01:20:53 -07001702 rec_len = EXT4_DIR_REC_LEN(de->name_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001703 if (de > to)
1704 memmove(to, de, rec_len);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001705 to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001706 prev = to;
Mingming Cao617ba132006-10-11 01:20:53 -07001707 to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001708 }
1709 de = next;
1710 }
1711 return prev;
1712}
1713
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001714/*
1715 * Split a full leaf block to make room for a new dir entry.
1716 * Allocate a new block, and move entries so that they are approx. equally full.
1717 * Returns pointer to de in block into which the new entry will be inserted.
1718 */
Mingming Cao617ba132006-10-11 01:20:53 -07001719static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001720 struct buffer_head **bh,struct dx_frame *frame,
Theodore Ts'of8b3b592014-08-29 20:52:18 -04001721 struct dx_hash_info *hinfo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001722{
1723 unsigned blocksize = dir->i_sb->s_blocksize;
1724 unsigned count, continued;
1725 struct buffer_head *bh2;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001726 ext4_lblk_t newblock;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001727 u32 hash2;
1728 struct dx_map_entry *map;
1729 char *data1 = (*bh)->b_data, *data2;
Theodore Ts'o59e315b2008-12-06 16:58:39 -05001730 unsigned split, move, size;
Mingming Cao617ba132006-10-11 01:20:53 -07001731 struct ext4_dir_entry_2 *de = NULL, *de2;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001732 struct ext4_dir_entry_tail *t;
1733 int csum_size = 0;
Theodore Ts'o59e315b2008-12-06 16:58:39 -05001734 int err = 0, i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001735
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04001736 if (ext4_has_metadata_csum(dir->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001737 csum_size = sizeof(struct ext4_dir_entry_tail);
1738
Theodore Ts'o0f70b402013-02-15 03:35:57 -05001739 bh2 = ext4_append(handle, dir, &newblock);
1740 if (IS_ERR(bh2)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001741 brelse(*bh);
1742 *bh = NULL;
Theodore Ts'of8b3b592014-08-29 20:52:18 -04001743 return (struct ext4_dir_entry_2 *) bh2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001744 }
1745
1746 BUFFER_TRACE(*bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07001747 err = ext4_journal_get_write_access(handle, *bh);
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001748 if (err)
1749 goto journal_error;
1750
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001751 BUFFER_TRACE(frame->bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07001752 err = ext4_journal_get_write_access(handle, frame->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001753 if (err)
1754 goto journal_error;
1755
1756 data2 = bh2->b_data;
1757
1758 /* create map in the end of data2 block */
1759 map = (struct dx_map_entry *) (data2 + blocksize);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001760 count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001761 blocksize, hinfo, map);
1762 map -= count;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001763 dx_sort_map(map, count);
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001764 /* Split the existing block in the middle, size-wise */
1765 size = 0;
1766 move = 0;
1767 for (i = count-1; i >= 0; i--) {
1768 /* is more than half of this entry in 2nd half of the block? */
1769 if (size + map[i].size/2 > blocksize/2)
1770 break;
1771 size += map[i].size;
1772 move++;
1773 }
1774 /* map index at which we will split */
1775 split = count - move;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001776 hash2 = map[split].hash;
1777 continued = hash2 == map[split - 1].hash;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001778 dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
1779 (unsigned long)dx_get_block(frame->at),
1780 hash2, split, count-split));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001781
1782 /* Fancy dance to stay within two buffers */
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001783 de2 = dx_move_dirents(data1, data2, map + split, count - split,
1784 blocksize);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001785 de = dx_pack_dirents(data1, blocksize);
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001786 de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
1787 (char *) de,
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001788 blocksize);
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001789 de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
1790 (char *) de2,
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001791 blocksize);
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001792 if (csum_size) {
1793 t = EXT4_DIRENT_TAIL(data2, blocksize);
1794 initialize_dirent_tail(t, blocksize);
1795
1796 t = EXT4_DIRENT_TAIL(data1, blocksize);
1797 initialize_dirent_tail(t, blocksize);
1798 }
1799
Michael Halcrowb3098482015-04-12 01:07:01 -04001800 dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
1801 blocksize, 1));
1802 dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
1803 blocksize, 1));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001804
1805 /* Which block gets the new entry? */
Theodore Ts'of8b3b592014-08-29 20:52:18 -04001806 if (hinfo->hash >= hash2) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001807 swap(*bh, bh2);
1808 de = de2;
1809 }
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001810 dx_insert_block(frame, hash2 + continued, newblock);
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001811 err = ext4_handle_dirty_dirent_node(handle, dir, bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001812 if (err)
1813 goto journal_error;
Darrick J. Wongdbe89442012-04-29 18:39:10 -04001814 err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001815 if (err)
1816 goto journal_error;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001817 brelse(bh2);
1818 dxtrace(dx_show_index("frame", frame->entries));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001819 return de;
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001820
1821journal_error:
1822 brelse(*bh);
1823 brelse(bh2);
1824 *bh = NULL;
1825 ext4_std_error(dir->i_sb, err);
Theodore Ts'of8b3b592014-08-29 20:52:18 -04001826 return ERR_PTR(err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001827}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001828
Tao Ma978fef92012-12-10 14:05:58 -05001829int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1830 struct buffer_head *bh,
1831 void *buf, int buf_size,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001832 struct ext4_filename *fname,
Tao Ma978fef92012-12-10 14:05:58 -05001833 struct ext4_dir_entry_2 **dest_de)
1834{
1835 struct ext4_dir_entry_2 *de;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001836 unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname));
Tao Ma978fef92012-12-10 14:05:58 -05001837 int nlen, rlen;
1838 unsigned int offset = 0;
1839 char *top;
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001840 int res;
1841
Tao Ma978fef92012-12-10 14:05:58 -05001842 de = (struct ext4_dir_entry_2 *)buf;
1843 top = buf + buf_size - reclen;
1844 while ((char *) de <= top) {
1845 if (ext4_check_dir_entry(dir, NULL, de, bh,
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001846 buf, buf_size, offset)) {
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001847 res = -EFSCORRUPTED;
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001848 goto return_result;
1849 }
1850 /* Provide crypto context and crypto buffer to ext4 match */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001851 res = ext4_match(fname, de);
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001852 if (res < 0)
1853 goto return_result;
1854 if (res > 0) {
1855 res = -EEXIST;
1856 goto return_result;
1857 }
Tao Ma978fef92012-12-10 14:05:58 -05001858 nlen = EXT4_DIR_REC_LEN(de->name_len);
1859 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
1860 if ((de->inode ? rlen - nlen : rlen) >= reclen)
1861 break;
1862 de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
1863 offset += rlen;
1864 }
Tao Ma978fef92012-12-10 14:05:58 -05001865
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001866 if ((char *) de > top)
1867 res = -ENOSPC;
1868 else {
1869 *dest_de = de;
1870 res = 0;
1871 }
1872return_result:
Michael Halcrow1f3862b2015-04-12 01:09:03 -04001873 return res;
Tao Ma978fef92012-12-10 14:05:58 -05001874}
1875
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001876int ext4_insert_dentry(struct inode *dir,
1877 struct inode *inode,
1878 struct ext4_dir_entry_2 *de,
1879 int buf_size,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001880 struct ext4_filename *fname)
Tao Ma978fef92012-12-10 14:05:58 -05001881{
1882
1883 int nlen, rlen;
1884
1885 nlen = EXT4_DIR_REC_LEN(de->name_len);
1886 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
1887 if (de->inode) {
1888 struct ext4_dir_entry_2 *de1 =
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001889 (struct ext4_dir_entry_2 *)((char *)de + nlen);
Tao Ma978fef92012-12-10 14:05:58 -05001890 de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
1891 de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
1892 de = de1;
1893 }
1894 de->file_type = EXT4_FT_UNKNOWN;
1895 de->inode = cpu_to_le32(inode->i_ino);
1896 ext4_set_de_type(inode->i_sb, de, inode->i_mode);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001897 de->name_len = fname_len(fname);
1898 memcpy(de->name, fname_name(fname), fname_len(fname));
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001899 return 0;
Tao Ma978fef92012-12-10 14:05:58 -05001900}
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001901
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001902/*
1903 * Add a new entry into a directory (leaf) block. If de is non-NULL,
1904 * it points to a directory entry which is guaranteed to be large
1905 * enough for new directory entry. If de is NULL, then
1906 * add_dirent_to_buf will attempt search the directory block for
1907 * space. It will return -ENOSPC if no space is available, and -EIO
1908 * and -EEXIST if directory entry already exists.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001909 */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001910static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
1911 struct inode *dir,
Mingming Cao617ba132006-10-11 01:20:53 -07001912 struct inode *inode, struct ext4_dir_entry_2 *de,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001913 struct buffer_head *bh)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001914{
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001915 unsigned int blocksize = dir->i_sb->s_blocksize;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001916 int csum_size = 0;
Tao Ma978fef92012-12-10 14:05:58 -05001917 int err;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001918
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04001919 if (ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001920 csum_size = sizeof(struct ext4_dir_entry_tail);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001921
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001922 if (!de) {
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001923 err = ext4_find_dest_de(dir, inode, bh, bh->b_data,
1924 blocksize - csum_size, fname, &de);
Tao Ma978fef92012-12-10 14:05:58 -05001925 if (err)
1926 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001927 }
1928 BUFFER_TRACE(bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07001929 err = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001930 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07001931 ext4_std_error(dir->i_sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001932 return err;
1933 }
1934
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001935 /* By now the buffer is marked for journaling. Due to crypto operations,
1936 * the following function call may fail */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001937 err = ext4_insert_dentry(dir, inode, de, blocksize, fname);
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001938 if (err < 0)
1939 return err;
Tao Ma978fef92012-12-10 14:05:58 -05001940
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001941 /*
1942 * XXX shouldn't update any times until successful
1943 * completion of syscall, but too many callers depend
1944 * on this.
1945 *
1946 * XXX similarly, too many callers depend on
Mingming Cao617ba132006-10-11 01:20:53 -07001947 * ext4_new_inode() setting the times, but error
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001948 * recovery deletes the inode, so the worst that can
1949 * happen is that the times are slightly out of date
1950 * and/or different from the directory change time.
1951 */
Kalpak Shahef7f3832007-07-18 09:15:20 -04001952 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
Mingming Cao617ba132006-10-11 01:20:53 -07001953 ext4_update_dx_flag(dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001954 dir->i_version++;
Mingming Cao617ba132006-10-11 01:20:53 -07001955 ext4_mark_inode_dirty(handle, dir);
Frank Mayhar03901312009-01-07 00:06:22 -05001956 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001957 err = ext4_handle_dirty_dirent_node(handle, dir, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001958 if (err)
Mingming Cao617ba132006-10-11 01:20:53 -07001959 ext4_std_error(dir->i_sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001960 return 0;
1961}
1962
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001963/*
1964 * This converts a one block unindexed directory to a 3 block indexed
1965 * directory, and adds the dentry to the indexed directory.
1966 */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04001967static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
Theodore Ts'o56a04912016-01-08 16:00:31 -05001968 struct inode *dir,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001969 struct inode *inode, struct buffer_head *bh)
1970{
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001971 struct buffer_head *bh2;
1972 struct dx_root *root;
1973 struct dx_frame frames[2], *frame;
1974 struct dx_entry *entries;
Mingming Cao617ba132006-10-11 01:20:53 -07001975 struct ext4_dir_entry_2 *de, *de2;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001976 struct ext4_dir_entry_tail *t;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001977 char *data1, *top;
1978 unsigned len;
1979 int retval;
1980 unsigned blocksize;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001981 ext4_lblk_t block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001982 struct fake_dirent *fde;
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001983 int csum_size = 0;
1984
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04001985 if (ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -04001986 csum_size = sizeof(struct ext4_dir_entry_tail);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001987
1988 blocksize = dir->i_sb->s_blocksize;
Theodore Ts'oe6b8bc02009-01-16 11:13:40 -05001989 dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
liang xie5d601252014-05-12 22:06:43 -04001990 BUFFER_TRACE(bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07001991 retval = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001992 if (retval) {
Mingming Cao617ba132006-10-11 01:20:53 -07001993 ext4_std_error(dir->i_sb, retval);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001994 brelse(bh);
1995 return retval;
1996 }
1997 root = (struct dx_root *) bh->b_data;
1998
Theodore Ts'oe6b8bc02009-01-16 11:13:40 -05001999 /* The 0th block becomes the root, move the dirents out */
2000 fde = &root->dotdot;
2001 de = (struct ext4_dir_entry_2 *)((char *)fde +
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002002 ext4_rec_len_from_disk(fde->rec_len, blocksize));
Theodore Ts'oe6b8bc02009-01-16 11:13:40 -05002003 if ((char *) de >= (((char *) root) + blocksize)) {
Theodore Ts'o24676da2010-05-16 21:00:00 -04002004 EXT4_ERROR_INODE(dir, "invalid rec_len for '..'");
Theodore Ts'oe6b8bc02009-01-16 11:13:40 -05002005 brelse(bh);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04002006 return -EFSCORRUPTED;
Theodore Ts'oe6b8bc02009-01-16 11:13:40 -05002007 }
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002008 len = ((char *) root) + (blocksize - csum_size) - (char *) de;
Theodore Ts'oe6b8bc02009-01-16 11:13:40 -05002009
2010 /* Allocate new block for the 0th block's dirents */
Theodore Ts'o0f70b402013-02-15 03:35:57 -05002011 bh2 = ext4_append(handle, dir, &block);
2012 if (IS_ERR(bh2)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002013 brelse(bh);
Theodore Ts'o0f70b402013-02-15 03:35:57 -05002014 return PTR_ERR(bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002015 }
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04002016 ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002017 data1 = bh2->b_data;
2018
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002019 memcpy (data1, de, len);
Mingming Cao617ba132006-10-11 01:20:53 -07002020 de = (struct ext4_dir_entry_2 *) data1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002021 top = data1 + len;
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002022 while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002023 de = de2;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002024 de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
2025 (char *) de,
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002026 blocksize);
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002027
2028 if (csum_size) {
2029 t = EXT4_DIRENT_TAIL(data1, blocksize);
2030 initialize_dirent_tail(t, blocksize);
2031 }
2032
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002033 /* Initialize the root; the dot dirents already exist */
Mingming Cao617ba132006-10-11 01:20:53 -07002034 de = (struct ext4_dir_entry_2 *) (&root->dotdot);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002035 de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2),
2036 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002037 memset (&root->info, 0, sizeof(root->info));
2038 root->info.info_length = sizeof(root->info);
Mingming Cao617ba132006-10-11 01:20:53 -07002039 root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002040 entries = root->entries;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002041 dx_set_block(entries, 1);
2042 dx_set_count(entries, 1);
2043 dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002044
2045 /* Initialize as for dx_probe */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002046 fname->hinfo.hash_version = root->info.hash_version;
2047 if (fname->hinfo.hash_version <= DX_HASH_TEA)
2048 fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
2049 fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
2050 ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo);
2051
Jan Kara6050d472014-10-30 10:53:17 -04002052 memset(frames, 0, sizeof(frames));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002053 frame = frames;
2054 frame->entries = entries;
2055 frame->at = entries;
2056 frame->bh = bh;
Allison Henderson6976a6f2011-05-15 00:19:41 -04002057
Jan Kara6050d472014-10-30 10:53:17 -04002058 retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
2059 if (retval)
2060 goto out_frames;
gmaile81d4472016-09-30 01:33:37 -04002061 retval = ext4_handle_dirty_dirent_node(handle, dir, bh2);
Jan Kara6050d472014-10-30 10:53:17 -04002062 if (retval)
2063 goto out_frames;
Allison Henderson6976a6f2011-05-15 00:19:41 -04002064
gmaile81d4472016-09-30 01:33:37 -04002065 de = do_split(handle,dir, &bh2, frame, &fname->hinfo);
Theodore Ts'of8b3b592014-08-29 20:52:18 -04002066 if (IS_ERR(de)) {
Jan Kara6050d472014-10-30 10:53:17 -04002067 retval = PTR_ERR(de);
2068 goto out_frames;
Jan Kara7ad8e4e2011-05-03 11:05:55 -04002069 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002070
gmaile81d4472016-09-30 01:33:37 -04002071 retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2);
Jan Kara6050d472014-10-30 10:53:17 -04002072out_frames:
2073 /*
2074 * Even if the block split failed, we have to properly write
2075 * out all the changes we did so far. Otherwise we can end up
2076 * with corrupted filesystem.
2077 */
gmaile81d4472016-09-30 01:33:37 -04002078 if (retval)
2079 ext4_mark_inode_dirty(handle, dir);
Jan Kara6050d472014-10-30 10:53:17 -04002080 dx_release(frames);
gmaile81d4472016-09-30 01:33:37 -04002081 brelse(bh2);
Jan Kara6050d472014-10-30 10:53:17 -04002082 return retval;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002083}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002084
2085/*
Mingming Cao617ba132006-10-11 01:20:53 -07002086 * ext4_add_entry()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002087 *
2088 * adds a file entry to the specified directory, using the same
Mingming Cao617ba132006-10-11 01:20:53 -07002089 * semantics as ext4_find_entry(). It returns NULL if it failed.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002090 *
2091 * NOTE!! The inode part of 'de' is left at 0 - which means you
2092 * may not sleep between calling this and putting something into
2093 * the entry, as someone else might have used it while you slept.
2094 */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002095static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
2096 struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002097{
David Howells2b0143b2015-03-17 22:25:59 +00002098 struct inode *dir = d_inode(dentry->d_parent);
Lukas Czernere12fb972015-04-03 10:46:58 -04002099 struct buffer_head *bh = NULL;
Mingming Cao617ba132006-10-11 01:20:53 -07002100 struct ext4_dir_entry_2 *de;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002101 struct ext4_dir_entry_tail *t;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002102 struct super_block *sb;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002103 struct ext4_filename fname;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002104 int retval;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002105 int dx_fallback=0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002106 unsigned blocksize;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002107 ext4_lblk_t block, blocks;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002108 int csum_size = 0;
2109
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04002110 if (ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002111 csum_size = sizeof(struct ext4_dir_entry_tail);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002112
2113 sb = dir->i_sb;
2114 blocksize = sb->s_blocksize;
2115 if (!dentry->d_name.len)
2116 return -EINVAL;
Tao Ma3c47d542012-12-10 14:05:59 -05002117
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002118 retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
2119 if (retval)
2120 return retval;
2121
Tao Ma3c47d542012-12-10 14:05:59 -05002122 if (ext4_has_inline_data(dir)) {
Theodore Ts'o56a04912016-01-08 16:00:31 -05002123 retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
Tao Ma3c47d542012-12-10 14:05:59 -05002124 if (retval < 0)
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002125 goto out;
Tao Ma3c47d542012-12-10 14:05:59 -05002126 if (retval == 1) {
2127 retval = 0;
Lukas Czernere12fb972015-04-03 10:46:58 -04002128 goto out;
Tao Ma3c47d542012-12-10 14:05:59 -05002129 }
2130 }
2131
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002132 if (is_dx(dir)) {
Theodore Ts'o56a04912016-01-08 16:00:31 -05002133 retval = ext4_dx_add_entry(handle, &fname, dir, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002134 if (!retval || (retval != ERR_BAD_DX_DIR))
Lukas Czernere12fb972015-04-03 10:46:58 -04002135 goto out;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04002136 ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002137 dx_fallback++;
Mingming Cao617ba132006-10-11 01:20:53 -07002138 ext4_mark_inode_dirty(handle, dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002139 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002140 blocks = dir->i_size >> sb->s_blocksize_bits;
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002141 for (block = 0; block < blocks; block++) {
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002142 bh = ext4_read_dirblock(dir, block, DIRENT);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002143 if (IS_ERR(bh)) {
2144 retval = PTR_ERR(bh);
2145 bh = NULL;
2146 goto out;
2147 }
2148 retval = add_dirent_to_buf(handle, &fname, dir, inode,
2149 NULL, bh);
Lukas Czernere12fb972015-04-03 10:46:58 -04002150 if (retval != -ENOSPC)
2151 goto out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002152
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002153 if (blocks == 1 && !dx_fallback &&
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002154 ext4_has_feature_dir_index(sb)) {
Theodore Ts'o56a04912016-01-08 16:00:31 -05002155 retval = make_indexed_dir(handle, &fname, dir,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002156 inode, bh);
Lukas Czernere12fb972015-04-03 10:46:58 -04002157 bh = NULL; /* make_indexed_dir releases bh */
2158 goto out;
2159 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002160 brelse(bh);
2161 }
Theodore Ts'o0f70b402013-02-15 03:35:57 -05002162 bh = ext4_append(handle, dir, &block);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002163 if (IS_ERR(bh)) {
2164 retval = PTR_ERR(bh);
2165 bh = NULL;
2166 goto out;
2167 }
Mingming Cao617ba132006-10-11 01:20:53 -07002168 de = (struct ext4_dir_entry_2 *) bh->b_data;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002169 de->inode = 0;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002170 de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
2171
2172 if (csum_size) {
2173 t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
2174 initialize_dirent_tail(t, blocksize);
2175 }
2176
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002177 retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
Lukas Czernere12fb972015-04-03 10:46:58 -04002178out:
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002179 ext4_fname_free_filename(&fname);
Theodore Ts'o2de770a2009-11-23 07:25:49 -05002180 brelse(bh);
Frank Mayhar14ece102010-05-17 08:00:00 -04002181 if (retval == 0)
2182 ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
Theodore Ts'o2de770a2009-11-23 07:25:49 -05002183 return retval;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002184}
2185
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002186/*
2187 * Returns 0 for success, or a negative error value
2188 */
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002189static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
Theodore Ts'o56a04912016-01-08 16:00:31 -05002190 struct inode *dir, struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002191{
2192 struct dx_frame frames[2], *frame;
2193 struct dx_entry *entries, *at;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002194 struct buffer_head *bh;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002195 struct super_block *sb = dir->i_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002196 struct ext4_dir_entry_2 *de;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002197 int err;
2198
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002199 frame = dx_probe(fname, dir, NULL, frames);
Theodore Ts'odd73b5d2014-08-29 20:52:17 -04002200 if (IS_ERR(frame))
2201 return PTR_ERR(frame);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002202 entries = frame->entries;
2203 at = frame->at;
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002204 bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT);
2205 if (IS_ERR(bh)) {
2206 err = PTR_ERR(bh);
2207 bh = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002208 goto cleanup;
Carlos Maiolino6d1ab102012-09-27 09:31:33 -04002209 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002210
2211 BUFFER_TRACE(bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07002212 err = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002213 if (err)
2214 goto journal_error;
2215
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002216 err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh);
Theodore Ts'o2de770a2009-11-23 07:25:49 -05002217 if (err != -ENOSPC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002218 goto cleanup;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002219
2220 /* Block full, should compress but for now just split */
Theodore Ts'o4776004f2008-09-08 23:00:52 -04002221 dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002222 dx_get_count(entries), dx_get_limit(entries)));
2223 /* Need to split index? */
2224 if (dx_get_count(entries) == dx_get_limit(entries)) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002225 ext4_lblk_t newblock;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002226 unsigned icount = dx_get_count(entries);
2227 int levels = frame - frames;
2228 struct dx_entry *entries2;
2229 struct dx_node *node2;
2230 struct buffer_head *bh2;
2231
2232 if (levels && (dx_get_count(frames->entries) ==
2233 dx_get_limit(frames->entries))) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002234 ext4_warning_inode(dir, "Directory index full!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002235 err = -ENOSPC;
2236 goto cleanup;
2237 }
Theodore Ts'o0f70b402013-02-15 03:35:57 -05002238 bh2 = ext4_append(handle, dir, &newblock);
2239 if (IS_ERR(bh2)) {
2240 err = PTR_ERR(bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002241 goto cleanup;
Theodore Ts'o0f70b402013-02-15 03:35:57 -05002242 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002243 node2 = (struct dx_node *)(bh2->b_data);
2244 entries2 = node2->entries;
Andreas Schlick1f7bebb2009-09-10 23:16:07 -04002245 memset(&node2->fake, 0, sizeof(struct fake_dirent));
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002246 node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize,
2247 sb->s_blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002248 BUFFER_TRACE(frame->bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07002249 err = ext4_journal_get_write_access(handle, frame->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002250 if (err)
2251 goto journal_error;
2252 if (levels) {
2253 unsigned icount1 = icount/2, icount2 = icount - icount1;
2254 unsigned hash2 = dx_get_hash(entries + icount1);
Theodore Ts'o4776004f2008-09-08 23:00:52 -04002255 dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
2256 icount1, icount2));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002257
2258 BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
Mingming Cao617ba132006-10-11 01:20:53 -07002259 err = ext4_journal_get_write_access(handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002260 frames[0].bh);
2261 if (err)
2262 goto journal_error;
2263
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002264 memcpy((char *) entries2, (char *) (entries + icount1),
2265 icount2 * sizeof(struct dx_entry));
2266 dx_set_count(entries, icount1);
2267 dx_set_count(entries2, icount2);
2268 dx_set_limit(entries2, dx_node_limit(dir));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002269
2270 /* Which index block gets the new entry? */
2271 if (at - entries >= icount1) {
2272 frame->at = at = at - entries - icount1 + entries2;
2273 frame->entries = entries = entries2;
2274 swap(frame->bh, bh2);
2275 }
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002276 dx_insert_block(frames + 0, hash2, newblock);
2277 dxtrace(dx_show_index("node", frames[1].entries));
2278 dxtrace(dx_show_index("node",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002279 ((struct dx_node *) bh2->b_data)->entries));
Darrick J. Wongdbe89442012-04-29 18:39:10 -04002280 err = ext4_handle_dirty_dx_node(handle, dir, bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002281 if (err)
2282 goto journal_error;
2283 brelse (bh2);
2284 } else {
Theodore Ts'o4776004f2008-09-08 23:00:52 -04002285 dxtrace(printk(KERN_DEBUG
2286 "Creating second level index...\n"));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002287 memcpy((char *) entries2, (char *) entries,
2288 icount * sizeof(struct dx_entry));
2289 dx_set_limit(entries2, dx_node_limit(dir));
2290
2291 /* Set up root */
2292 dx_set_count(entries, 1);
2293 dx_set_block(entries + 0, newblock);
2294 ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
2295
2296 /* Add new access path frame */
2297 frame = frames + 1;
2298 frame->at = at = at - entries + entries2;
2299 frame->entries = entries = entries2;
2300 frame->bh = bh2;
Mingming Cao617ba132006-10-11 01:20:53 -07002301 err = ext4_journal_get_write_access(handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002302 frame->bh);
2303 if (err)
2304 goto journal_error;
2305 }
Darrick J. Wongdbe89442012-04-29 18:39:10 -04002306 err = ext4_handle_dirty_dx_node(handle, dir, frames[0].bh);
Theodore Ts'ob4097142011-01-10 12:46:59 -05002307 if (err) {
2308 ext4_std_error(inode->i_sb, err);
2309 goto cleanup;
2310 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002311 }
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002312 de = do_split(handle, dir, &bh, frame, &fname->hinfo);
Theodore Ts'of8b3b592014-08-29 20:52:18 -04002313 if (IS_ERR(de)) {
2314 err = PTR_ERR(de);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002315 goto cleanup;
Theodore Ts'of8b3b592014-08-29 20:52:18 -04002316 }
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002317 err = add_dirent_to_buf(handle, fname, dir, inode, de, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002318 goto cleanup;
2319
2320journal_error:
Mingming Cao617ba132006-10-11 01:20:53 -07002321 ext4_std_error(dir->i_sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002322cleanup:
Guo Chaob1deefc2013-01-28 21:41:02 -05002323 brelse(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002324 dx_release(frames);
2325 return err;
2326}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002327
2328/*
Tao Ma05019a92012-12-10 14:06:00 -05002329 * ext4_generic_delete_entry deletes a directory entry by merging it
2330 * with the previous entry
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002331 */
Tao Ma05019a92012-12-10 14:06:00 -05002332int ext4_generic_delete_entry(handle_t *handle,
2333 struct inode *dir,
2334 struct ext4_dir_entry_2 *de_del,
2335 struct buffer_head *bh,
2336 void *entry_buf,
2337 int buf_size,
2338 int csum_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002339{
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002340 struct ext4_dir_entry_2 *de, *pde;
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002341 unsigned int blocksize = dir->i_sb->s_blocksize;
Tao Ma05019a92012-12-10 14:06:00 -05002342 int i;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002343
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002344 i = 0;
2345 pde = NULL;
Tao Ma05019a92012-12-10 14:06:00 -05002346 de = (struct ext4_dir_entry_2 *)entry_buf;
2347 while (i < buf_size - csum_size) {
Tao Ma226ba972012-12-10 14:05:58 -05002348 if (ext4_check_dir_entry(dir, NULL, de, bh,
2349 bh->b_data, bh->b_size, i))
Darrick J. Wong6a797d22015-10-17 16:16:04 -04002350 return -EFSCORRUPTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002351 if (de == de_del) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002352 if (pde)
Jan Karaa72d7f82008-01-28 23:58:27 -05002353 pde->rec_len = ext4_rec_len_to_disk(
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002354 ext4_rec_len_from_disk(pde->rec_len,
2355 blocksize) +
2356 ext4_rec_len_from_disk(de->rec_len,
2357 blocksize),
2358 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002359 else
2360 de->inode = 0;
2361 dir->i_version++;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002362 return 0;
2363 }
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002364 i += ext4_rec_len_from_disk(de->rec_len, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002365 pde = de;
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002366 de = ext4_next_entry(de, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002367 }
2368 return -ENOENT;
2369}
2370
Tao Ma05019a92012-12-10 14:06:00 -05002371static int ext4_delete_entry(handle_t *handle,
2372 struct inode *dir,
2373 struct ext4_dir_entry_2 *de_del,
2374 struct buffer_head *bh)
2375{
2376 int err, csum_size = 0;
2377
Tao Ma9f40fe52012-12-10 14:06:00 -05002378 if (ext4_has_inline_data(dir)) {
2379 int has_inline_data = 1;
2380 err = ext4_delete_inline_entry(handle, dir, de_del, bh,
2381 &has_inline_data);
2382 if (has_inline_data)
2383 return err;
2384 }
2385
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04002386 if (ext4_has_metadata_csum(dir->i_sb))
Tao Ma05019a92012-12-10 14:06:00 -05002387 csum_size = sizeof(struct ext4_dir_entry_tail);
2388
2389 BUFFER_TRACE(bh, "get_write_access");
2390 err = ext4_journal_get_write_access(handle, bh);
2391 if (unlikely(err))
2392 goto out;
2393
2394 err = ext4_generic_delete_entry(handle, dir, de_del,
2395 bh, bh->b_data,
2396 dir->i_sb->s_blocksize, csum_size);
2397 if (err)
2398 goto out;
2399
2400 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
2401 err = ext4_handle_dirty_dirent_node(handle, dir, bh);
2402 if (unlikely(err))
2403 goto out;
2404
2405 return 0;
2406out:
2407 if (err != -ENOENT)
2408 ext4_std_error(dir->i_sb, err);
2409 return err;
2410}
2411
Andreas Dilgerf8628a12007-07-18 08:38:01 -04002412/*
2413 * DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2,
2414 * since this indicates that nlinks count was previously 1.
2415 */
2416static void ext4_inc_count(handle_t *handle, struct inode *inode)
2417{
2418 inc_nlink(inode);
2419 if (is_dx(inode) && inode->i_nlink > 1) {
2420 /* limit is 16-bit i_links_count */
2421 if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) {
Miklos Szeredibfe86842011-10-28 14:13:29 +02002422 set_nlink(inode, 1);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002423 ext4_set_feature_dir_nlink(inode->i_sb);
Andreas Dilgerf8628a12007-07-18 08:38:01 -04002424 }
2425 }
2426}
2427
2428/*
2429 * If a directory had nlink == 1, then we should let it be 1. This indicates
2430 * directory has >EXT4_LINK_MAX subdirs.
2431 */
2432static void ext4_dec_count(handle_t *handle, struct inode *inode)
2433{
Andreas Dilger909a4cf2011-10-26 03:22:31 -04002434 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
2435 drop_nlink(inode);
Andreas Dilgerf8628a12007-07-18 08:38:01 -04002436}
2437
2438
Mingming Cao617ba132006-10-11 01:20:53 -07002439static int ext4_add_nondir(handle_t *handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002440 struct dentry *dentry, struct inode *inode)
2441{
Mingming Cao617ba132006-10-11 01:20:53 -07002442 int err = ext4_add_entry(handle, dentry, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002443 if (!err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002444 ext4_mark_inode_dirty(handle, inode);
Al Viro6b38e842008-12-30 02:03:31 -05002445 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +04002446 d_instantiate(dentry, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002447 return 0;
2448 }
Eric Sandeen731b9a52007-02-10 01:46:16 -08002449 drop_nlink(inode);
Al Viro6b38e842008-12-30 02:03:31 -05002450 unlock_new_inode(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002451 iput(inode);
2452 return err;
2453}
2454
2455/*
2456 * By the time this is called, we already have created
2457 * the directory cache entry for the new file, but it
2458 * is so far negative - it has no inode.
2459 *
2460 * If the create succeeds, we fill in the inode information
2461 * with d_instantiate().
2462 */
Al Viro4acdaf22011-07-26 01:42:34 -04002463static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -04002464 bool excl)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002465{
2466 handle_t *handle;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002467 struct inode *inode;
Theodore Ts'o11395752013-02-09 16:27:09 -05002468 int err, credits, retries = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002469
Jan Karaa7cdade2015-06-29 16:22:54 +02002470 err = dquot_initialize(dir);
2471 if (err)
2472 return err;
Christoph Hellwig907f4552010-03-03 09:05:06 -05002473
Theodore Ts'o11395752013-02-09 16:27:09 -05002474 credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
Jan Karaeb9cc7e2013-04-19 13:38:14 -04002475 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002476retry:
Theodore Ts'o11395752013-02-09 16:27:09 -05002477 inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
2478 NULL, EXT4_HT_DIR, credits);
2479 handle = ext4_journal_current_handle();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002480 err = PTR_ERR(inode);
2481 if (!IS_ERR(inode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002482 inode->i_op = &ext4_file_inode_operations;
Boaz Harroshbe64f882015-04-15 16:15:17 -07002483 inode->i_fop = &ext4_file_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002484 ext4_set_aops(inode);
Theodore Ts'oe709e9d2015-05-31 13:35:02 -04002485 err = ext4_add_nondir(handle, dentry, inode);
Theodore Ts'o11395752013-02-09 16:27:09 -05002486 if (!err && IS_DIRSYNC(dir))
2487 ext4_handle_sync(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002488 }
Theodore Ts'o11395752013-02-09 16:27:09 -05002489 if (handle)
2490 ext4_journal_stop(handle);
Mingming Cao617ba132006-10-11 01:20:53 -07002491 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002492 goto retry;
2493 return err;
2494}
2495
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002496static int ext4_mknod(struct inode *dir, struct dentry *dentry,
Al Viro1a67aaf2011-07-26 01:52:52 -04002497 umode_t mode, dev_t rdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002498{
2499 handle_t *handle;
2500 struct inode *inode;
Theodore Ts'o11395752013-02-09 16:27:09 -05002501 int err, credits, retries = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002502
Jan Karaa7cdade2015-06-29 16:22:54 +02002503 err = dquot_initialize(dir);
2504 if (err)
2505 return err;
Christoph Hellwig907f4552010-03-03 09:05:06 -05002506
Theodore Ts'o11395752013-02-09 16:27:09 -05002507 credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
Jan Karaeb9cc7e2013-04-19 13:38:14 -04002508 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002509retry:
Theodore Ts'o11395752013-02-09 16:27:09 -05002510 inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
2511 NULL, EXT4_HT_DIR, credits);
2512 handle = ext4_journal_current_handle();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002513 err = PTR_ERR(inode);
2514 if (!IS_ERR(inode)) {
2515 init_special_inode(inode, inode->i_mode, rdev);
Mingming Cao617ba132006-10-11 01:20:53 -07002516 inode->i_op = &ext4_special_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002517 err = ext4_add_nondir(handle, dentry, inode);
Theodore Ts'o11395752013-02-09 16:27:09 -05002518 if (!err && IS_DIRSYNC(dir))
2519 ext4_handle_sync(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002520 }
Theodore Ts'o11395752013-02-09 16:27:09 -05002521 if (handle)
2522 ext4_journal_stop(handle);
Mingming Cao617ba132006-10-11 01:20:53 -07002523 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002524 goto retry;
2525 return err;
2526}
2527
Al Viroaf51a2a2013-06-29 13:23:08 +04002528static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
2529{
2530 handle_t *handle;
2531 struct inode *inode;
2532 int err, retries = 0;
2533
Jan Karaa7cdade2015-06-29 16:22:54 +02002534 err = dquot_initialize(dir);
2535 if (err)
2536 return err;
Al Viroaf51a2a2013-06-29 13:23:08 +04002537
2538retry:
2539 inode = ext4_new_inode_start_handle(dir, mode,
2540 NULL, 0, NULL,
2541 EXT4_HT_DIR,
2542 EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
2543 4 + EXT4_XATTR_TRANS_BLOCKS);
2544 handle = ext4_journal_current_handle();
2545 err = PTR_ERR(inode);
2546 if (!IS_ERR(inode)) {
2547 inode->i_op = &ext4_file_inode_operations;
Boaz Harroshbe64f882015-04-15 16:15:17 -07002548 inode->i_fop = &ext4_file_operations;
Al Viroaf51a2a2013-06-29 13:23:08 +04002549 ext4_set_aops(inode);
Zheng Liue94bd342013-07-20 21:58:38 -04002550 d_tmpfile(dentry, inode);
Al Viroaf51a2a2013-06-29 13:23:08 +04002551 err = ext4_orphan_add(handle, inode);
2552 if (err)
Miklos Szeredi43ae9e32013-10-10 16:48:19 +02002553 goto err_unlock_inode;
Al Viroaf51a2a2013-06-29 13:23:08 +04002554 mark_inode_dirty(inode);
Al Viroaf51a2a2013-06-29 13:23:08 +04002555 unlock_new_inode(inode);
2556 }
2557 if (handle)
2558 ext4_journal_stop(handle);
2559 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
2560 goto retry;
2561 return err;
Miklos Szeredi43ae9e32013-10-10 16:48:19 +02002562err_unlock_inode:
Al Viroaf51a2a2013-06-29 13:23:08 +04002563 ext4_journal_stop(handle);
2564 unlock_new_inode(inode);
Al Viroaf51a2a2013-06-29 13:23:08 +04002565 return err;
2566}
2567
Tao Maa774f9c2012-12-10 14:05:57 -05002568struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2569 struct ext4_dir_entry_2 *de,
2570 int blocksize, int csum_size,
2571 unsigned int parent_ino, int dotdot_real_len)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002572{
Tao Maa774f9c2012-12-10 14:05:57 -05002573 de->inode = cpu_to_le32(inode->i_ino);
2574 de->name_len = 1;
2575 de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len),
2576 blocksize);
2577 strcpy(de->name, ".");
2578 ext4_set_de_type(inode->i_sb, de, S_IFDIR);
2579
2580 de = ext4_next_entry(de, blocksize);
2581 de->inode = cpu_to_le32(parent_ino);
2582 de->name_len = 2;
2583 if (!dotdot_real_len)
2584 de->rec_len = ext4_rec_len_to_disk(blocksize -
2585 (csum_size + EXT4_DIR_REC_LEN(1)),
2586 blocksize);
2587 else
2588 de->rec_len = ext4_rec_len_to_disk(
2589 EXT4_DIR_REC_LEN(de->name_len), blocksize);
2590 strcpy(de->name, "..");
2591 ext4_set_de_type(inode->i_sb, de, S_IFDIR);
2592
2593 return ext4_next_entry(de, blocksize);
2594}
2595
2596static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2597 struct inode *inode)
2598{
Namhyung Kimdabd9912011-01-10 12:11:16 -05002599 struct buffer_head *dir_block = NULL;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002600 struct ext4_dir_entry_2 *de;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002601 struct ext4_dir_entry_tail *t;
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002602 ext4_lblk_t block = 0;
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002603 unsigned int blocksize = dir->i_sb->s_blocksize;
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002604 int csum_size = 0;
Tao Maa774f9c2012-12-10 14:05:57 -05002605 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002606
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04002607 if (ext4_has_metadata_csum(dir->i_sb))
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002608 csum_size = sizeof(struct ext4_dir_entry_tail);
2609
Tao Ma3c47d542012-12-10 14:05:59 -05002610 if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2611 err = ext4_try_create_inline_dir(handle, dir, inode);
2612 if (err < 0 && err != -ENOSPC)
2613 goto out;
2614 if (!err)
2615 goto out;
2616 }
2617
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002618 inode->i_size = 0;
Theodore Ts'o0f70b402013-02-15 03:35:57 -05002619 dir_block = ext4_append(handle, inode, &block);
2620 if (IS_ERR(dir_block))
2621 return PTR_ERR(dir_block);
Tao Maa774f9c2012-12-10 14:05:57 -05002622 de = (struct ext4_dir_entry_2 *)dir_block->b_data;
2623 ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
2624 set_nlink(inode, 2);
2625 if (csum_size) {
2626 t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize);
2627 initialize_dirent_tail(t, blocksize);
2628 }
2629
2630 BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
2631 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
2632 if (err)
2633 goto out;
2634 set_buffer_verified(dir_block);
2635out:
2636 brelse(dir_block);
2637 return err;
2638}
2639
2640static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
2641{
2642 handle_t *handle;
2643 struct inode *inode;
Theodore Ts'o11395752013-02-09 16:27:09 -05002644 int err, credits, retries = 0;
Tao Maa774f9c2012-12-10 14:05:57 -05002645
Andreas Dilgerf8628a12007-07-18 08:38:01 -04002646 if (EXT4_DIR_LINK_MAX(dir))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002647 return -EMLINK;
2648
Jan Karaa7cdade2015-06-29 16:22:54 +02002649 err = dquot_initialize(dir);
2650 if (err)
2651 return err;
Christoph Hellwig907f4552010-03-03 09:05:06 -05002652
Theodore Ts'o11395752013-02-09 16:27:09 -05002653 credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
Jan Karaeb9cc7e2013-04-19 13:38:14 -04002654 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002655retry:
Theodore Ts'o11395752013-02-09 16:27:09 -05002656 inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
2657 &dentry->d_name,
2658 0, NULL, EXT4_HT_DIR, credits);
2659 handle = ext4_journal_current_handle();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002660 err = PTR_ERR(inode);
2661 if (IS_ERR(inode))
2662 goto out_stop;
2663
Mingming Cao617ba132006-10-11 01:20:53 -07002664 inode->i_op = &ext4_dir_inode_operations;
2665 inode->i_fop = &ext4_dir_operations;
Tao Maa774f9c2012-12-10 14:05:57 -05002666 err = ext4_init_new_dir(handle, dir, inode);
Namhyung Kimdabd9912011-01-10 12:11:16 -05002667 if (err)
2668 goto out_clear_inode;
Namhyung Kimdabd9912011-01-10 12:11:16 -05002669 err = ext4_mark_inode_dirty(handle, inode);
2670 if (!err)
2671 err = ext4_add_entry(handle, dentry, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002672 if (err) {
Aneesh Kumar K.V4cdeed82008-02-22 06:17:31 -05002673out_clear_inode:
2674 clear_nlink(inode);
Al Viro6b38e842008-12-30 02:03:31 -05002675 unlock_new_inode(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002676 ext4_mark_inode_dirty(handle, inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002677 iput(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002678 goto out_stop;
2679 }
Andreas Dilgerf8628a12007-07-18 08:38:01 -04002680 ext4_inc_count(handle, dir);
Mingming Cao617ba132006-10-11 01:20:53 -07002681 ext4_update_dx_flag(dir);
Namhyung Kimdabd9912011-01-10 12:11:16 -05002682 err = ext4_mark_inode_dirty(handle, dir);
2683 if (err)
2684 goto out_clear_inode;
Al Viro6b38e842008-12-30 02:03:31 -05002685 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +04002686 d_instantiate(dentry, inode);
Theodore Ts'o11395752013-02-09 16:27:09 -05002687 if (IS_DIRSYNC(dir))
2688 ext4_handle_sync(handle);
2689
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002690out_stop:
Theodore Ts'o11395752013-02-09 16:27:09 -05002691 if (handle)
2692 ext4_journal_stop(handle);
Mingming Cao617ba132006-10-11 01:20:53 -07002693 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002694 goto retry;
2695 return err;
2696}
2697
2698/*
2699 * routine to check that the specified directory is empty (for rmdir)
2700 */
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002701bool ext4_empty_dir(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002702{
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002703 unsigned int offset;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002704 struct buffer_head *bh;
2705 struct ext4_dir_entry_2 *de, *de1;
2706 struct super_block *sb;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002707
Tao Ma61f86632012-12-10 14:06:01 -05002708 if (ext4_has_inline_data(inode)) {
2709 int has_inline_data = 1;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002710 int ret;
Tao Ma61f86632012-12-10 14:06:01 -05002711
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002712 ret = empty_inline_dir(inode, &has_inline_data);
Tao Ma61f86632012-12-10 14:06:01 -05002713 if (has_inline_data)
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002714 return ret;
Tao Ma61f86632012-12-10 14:06:01 -05002715 }
2716
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002717 sb = inode->i_sb;
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002718 if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
2719 EXT4_ERROR_INODE(inode, "invalid size");
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002720 return true;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002721 }
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002722 bh = ext4_read_dirblock(inode, 0, EITHER);
2723 if (IS_ERR(bh))
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002724 return true;
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002725
Mingming Cao617ba132006-10-11 01:20:53 -07002726 de = (struct ext4_dir_entry_2 *) bh->b_data;
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002727 de1 = ext4_next_entry(de, sb->s_blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002728 if (le32_to_cpu(de->inode) != inode->i_ino ||
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002729 le32_to_cpu(de1->inode) == 0 ||
2730 strcmp(".", de->name) || strcmp("..", de1->name)) {
2731 ext4_warning_inode(inode, "directory missing '.' and/or '..'");
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002732 brelse(bh);
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002733 return true;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002734 }
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002735 offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) +
2736 ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize);
2737 de = ext4_next_entry(de1, sb->s_blocksize);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002738 while (offset < inode->i_size) {
Dmitry Monakhov236f5ec2014-04-21 14:38:14 -04002739 if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
Theodore Ts'o24676da2010-05-16 21:00:00 -04002740 unsigned int lblock;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002741 brelse(bh);
Theodore Ts'o24676da2010-05-16 21:00:00 -04002742 lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
Theodore Ts'odc6982f2013-02-14 23:59:26 -05002743 bh = ext4_read_dirblock(inode, lblock, EITHER);
2744 if (IS_ERR(bh))
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002745 return true;
Mingming Cao617ba132006-10-11 01:20:53 -07002746 de = (struct ext4_dir_entry_2 *) bh->b_data;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002747 }
Tao Ma226ba972012-12-10 14:05:58 -05002748 if (ext4_check_dir_entry(inode, NULL, de, bh,
2749 bh->b_data, bh->b_size, offset)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002750 de = (struct ext4_dir_entry_2 *)(bh->b_data +
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002751 sb->s_blocksize);
2752 offset = (offset | (sb->s_blocksize - 1)) + 1;
2753 continue;
2754 }
2755 if (le32_to_cpu(de->inode)) {
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002756 brelse(bh);
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002757 return false;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002758 }
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002759 offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
2760 de = ext4_next_entry(de, sb->s_blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002761 }
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002762 brelse(bh);
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002763 return true;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002764}
2765
Jan Karad745a8c2014-05-26 11:56:53 -04002766/*
2767 * ext4_orphan_add() links an unlinked or truncated inode into a list of
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002768 * such inodes, starting at the superblock, in case we crash before the
2769 * file is closed/deleted, or in case the inode truncate spans multiple
2770 * transactions and the last transaction is not recovered after a crash.
2771 *
2772 * At filesystem recovery time, we walk this list deleting unlinked
Mingming Cao617ba132006-10-11 01:20:53 -07002773 * inodes and truncating linked inodes in ext4_orphan_cleanup().
Jan Karad745a8c2014-05-26 11:56:53 -04002774 *
2775 * Orphan list manipulation functions must be called under i_mutex unless
2776 * we are just creating the inode or deleting it.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002777 */
Mingming Cao617ba132006-10-11 01:20:53 -07002778int ext4_orphan_add(handle_t *handle, struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002779{
2780 struct super_block *sb = inode->i_sb;
Jan Karacd2c0802014-05-26 11:39:17 -04002781 struct ext4_sb_info *sbi = EXT4_SB(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002782 struct ext4_iloc iloc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002783 int err = 0, rc;
Jan Karad745a8c2014-05-26 11:56:53 -04002784 bool dirty = false;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002785
Theodore Ts'oe2bfb082014-10-05 22:47:07 -04002786 if (!sbi->s_journal || is_bad_inode(inode))
Frank Mayhar03901312009-01-07 00:06:22 -05002787 return 0;
2788
Jan Karad745a8c2014-05-26 11:56:53 -04002789 WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
Al Viro59551022016-01-22 15:40:57 -05002790 !inode_is_locked(inode));
Jan Karad745a8c2014-05-26 11:56:53 -04002791 /*
2792 * Exit early if inode already is on orphan list. This is a big speedup
2793 * since we don't have to contend on the global s_orphan_lock.
2794 */
Mingming Cao617ba132006-10-11 01:20:53 -07002795 if (!list_empty(&EXT4_I(inode)->i_orphan))
Jan Karad745a8c2014-05-26 11:56:53 -04002796 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002797
Lukas Czernerafb86172011-07-11 18:47:04 -04002798 /*
2799 * Orphan handling is only valid for files with data blocks
2800 * being truncated, or files being unlinked. Note that we either
2801 * hold i_mutex, or the inode can not be referenced from outside,
2802 * so i_nlink should not be bumped due to race
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002803 */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002804 J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2805 S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002806
Jan Karacd2c0802014-05-26 11:39:17 -04002807 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
2808 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002809 if (err)
Jan Karad745a8c2014-05-26 11:56:53 -04002810 goto out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002811
Mingming Cao617ba132006-10-11 01:20:53 -07002812 err = ext4_reserve_inode_write(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002813 if (err)
Jan Karad745a8c2014-05-26 11:56:53 -04002814 goto out;
2815
2816 mutex_lock(&sbi->s_orphan_lock);
Dmitry Monakhov6e3617e2010-03-01 23:29:39 -05002817 /*
2818 * Due to previous errors inode may be already a part of on-disk
2819 * orphan list. If so skip on-disk list modification.
2820 */
Jan Karad745a8c2014-05-26 11:56:53 -04002821 if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) >
2822 (le32_to_cpu(sbi->s_es->s_inodes_count))) {
2823 /* Insert this inode at the head of the on-disk orphan list */
2824 NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan);
2825 sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
2826 dirty = true;
2827 }
2828 list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan);
2829 mutex_unlock(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002830
Jan Karad745a8c2014-05-26 11:56:53 -04002831 if (dirty) {
2832 err = ext4_handle_dirty_super(handle, sb);
2833 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
2834 if (!err)
2835 err = rc;
2836 if (err) {
2837 /*
2838 * We have to remove inode from in-memory list if
2839 * addition to on disk orphan list failed. Stray orphan
2840 * list entries can cause panics at unmount time.
2841 */
2842 mutex_lock(&sbi->s_orphan_lock);
Jan Kara74177f552016-05-05 11:10:15 -04002843 list_del_init(&EXT4_I(inode)->i_orphan);
Jan Karad745a8c2014-05-26 11:56:53 -04002844 mutex_unlock(&sbi->s_orphan_lock);
2845 }
2846 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002847 jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
2848 jbd_debug(4, "orphan inode %lu will point to %d\n",
2849 inode->i_ino, NEXT_ORPHAN(inode));
Jan Karad745a8c2014-05-26 11:56:53 -04002850out:
Jan Karacd2c0802014-05-26 11:39:17 -04002851 ext4_std_error(sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002852 return err;
2853}
2854
2855/*
Mingming Cao617ba132006-10-11 01:20:53 -07002856 * ext4_orphan_del() removes an unlinked or truncated inode from the list
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002857 * of such inodes stored on disk, because it is finally being cleaned up.
2858 */
Mingming Cao617ba132006-10-11 01:20:53 -07002859int ext4_orphan_del(handle_t *handle, struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002860{
2861 struct list_head *prev;
Mingming Cao617ba132006-10-11 01:20:53 -07002862 struct ext4_inode_info *ei = EXT4_I(inode);
Jan Karacd2c0802014-05-26 11:39:17 -04002863 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002864 __u32 ino_next;
Mingming Cao617ba132006-10-11 01:20:53 -07002865 struct ext4_iloc iloc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002866 int err = 0;
2867
Jan Karacd2c0802014-05-26 11:39:17 -04002868 if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS))
Frank Mayhar03901312009-01-07 00:06:22 -05002869 return 0;
2870
Jan Karad745a8c2014-05-26 11:56:53 -04002871 WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
Al Viro59551022016-01-22 15:40:57 -05002872 !inode_is_locked(inode));
Jan Karad745a8c2014-05-26 11:56:53 -04002873 /* Do this quick check before taking global s_orphan_lock. */
Theodore Ts'o3b9d4ed2009-04-25 22:54:04 -04002874 if (list_empty(&ei->i_orphan))
Jan Karad745a8c2014-05-26 11:56:53 -04002875 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002876
Jan Karad745a8c2014-05-26 11:56:53 -04002877 if (handle) {
2878 /* Grab inode buffer early before taking global s_orphan_lock */
2879 err = ext4_reserve_inode_write(handle, inode, &iloc);
2880 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002881
Jan Karad745a8c2014-05-26 11:56:53 -04002882 mutex_lock(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002883 jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
2884
Jan Karad745a8c2014-05-26 11:56:53 -04002885 prev = ei->i_orphan.prev;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002886 list_del_init(&ei->i_orphan);
2887
2888 /* If we're on an error path, we may not have a valid
2889 * transaction handle with which to update the orphan list on
2890 * disk, but we still need to remove the inode from the linked
2891 * list in memory. */
Jan Karad745a8c2014-05-26 11:56:53 -04002892 if (!handle || err) {
2893 mutex_unlock(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002894 goto out_err;
Jan Karad745a8c2014-05-26 11:56:53 -04002895 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002896
Jan Karad745a8c2014-05-26 11:56:53 -04002897 ino_next = NEXT_ORPHAN(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002898 if (prev == &sbi->s_orphan) {
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002899 jbd_debug(4, "superblock will point to %u\n", ino_next);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002900 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07002901 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
Jan Karad745a8c2014-05-26 11:56:53 -04002902 if (err) {
2903 mutex_unlock(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002904 goto out_brelse;
Jan Karad745a8c2014-05-26 11:56:53 -04002905 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002906 sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
Jan Karad745a8c2014-05-26 11:56:53 -04002907 mutex_unlock(&sbi->s_orphan_lock);
Artem Bityutskiyb50924c2012-07-22 20:37:31 -04002908 err = ext4_handle_dirty_super(handle, inode->i_sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002909 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07002910 struct ext4_iloc iloc2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002911 struct inode *i_prev =
Mingming Cao617ba132006-10-11 01:20:53 -07002912 &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002913
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002914 jbd_debug(4, "orphan inode %lu will point to %u\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002915 i_prev->i_ino, ino_next);
Mingming Cao617ba132006-10-11 01:20:53 -07002916 err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
Jan Karad745a8c2014-05-26 11:56:53 -04002917 if (err) {
2918 mutex_unlock(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002919 goto out_brelse;
Jan Karad745a8c2014-05-26 11:56:53 -04002920 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002921 NEXT_ORPHAN(i_prev) = ino_next;
Mingming Cao617ba132006-10-11 01:20:53 -07002922 err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
Jan Karad745a8c2014-05-26 11:56:53 -04002923 mutex_unlock(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002924 }
2925 if (err)
2926 goto out_brelse;
2927 NEXT_ORPHAN(inode) = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002928 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002929out_err:
Mingming Cao617ba132006-10-11 01:20:53 -07002930 ext4_std_error(inode->i_sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002931 return err;
2932
2933out_brelse:
2934 brelse(iloc.bh);
2935 goto out_err;
2936}
2937
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002938static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002939{
2940 int retval;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002941 struct inode *inode;
2942 struct buffer_head *bh;
2943 struct ext4_dir_entry_2 *de;
Theodore Ts'o8dcfaad2013-02-09 09:45:11 -05002944 handle_t *handle = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002945
2946 /* Initialize quotas before so that eventual writes go in
2947 * separate transaction */
Jan Karaa7cdade2015-06-29 16:22:54 +02002948 retval = dquot_initialize(dir);
2949 if (retval)
2950 return retval;
2951 retval = dquot_initialize(d_inode(dentry));
2952 if (retval)
2953 return retval;
Christoph Hellwig907f4552010-03-03 09:05:06 -05002954
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002955 retval = -ENOENT;
Tao Ma32f7f222012-12-10 14:06:01 -05002956 bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
Theodore Ts'o36de9282014-08-23 17:47:19 -04002957 if (IS_ERR(bh))
2958 return PTR_ERR(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002959 if (!bh)
2960 goto end_rmdir;
2961
David Howells2b0143b2015-03-17 22:25:59 +00002962 inode = d_inode(dentry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002963
Darrick J. Wong6a797d22015-10-17 16:16:04 -04002964 retval = -EFSCORRUPTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002965 if (le32_to_cpu(de->inode) != inode->i_ino)
2966 goto end_rmdir;
2967
2968 retval = -ENOTEMPTY;
Michael Halcrowe875a2d2015-04-11 07:46:49 -04002969 if (!ext4_empty_dir(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002970 goto end_rmdir;
2971
Theodore Ts'o8dcfaad2013-02-09 09:45:11 -05002972 handle = ext4_journal_start(dir, EXT4_HT_DIR,
Theodore Ts'o64044ab2013-02-09 15:06:24 -05002973 EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
Theodore Ts'o8dcfaad2013-02-09 09:45:11 -05002974 if (IS_ERR(handle)) {
2975 retval = PTR_ERR(handle);
2976 handle = NULL;
2977 goto end_rmdir;
2978 }
2979
2980 if (IS_DIRSYNC(dir))
2981 ext4_handle_sync(handle);
2982
Mingming Cao617ba132006-10-11 01:20:53 -07002983 retval = ext4_delete_entry(handle, dir, de, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002984 if (retval)
2985 goto end_rmdir;
Andreas Dilgerf8628a12007-07-18 08:38:01 -04002986 if (!EXT4_DIR_LINK_EMPTY(inode))
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002987 ext4_warning_inode(inode,
2988 "empty directory '%.*s' has too many links (%u)",
2989 dentry->d_name.len, dentry->d_name.name,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002990 inode->i_nlink);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002991 inode->i_version++;
2992 clear_nlink(inode);
2993 /* There's no need to set i_disksize: the fact that i_nlink is
2994 * zero will ensure that the right thing happens during any
2995 * recovery. */
2996 inode->i_size = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002997 ext4_orphan_add(handle, inode);
Kalpak Shahef7f3832007-07-18 09:15:20 -04002998 inode->i_ctime = dir->i_ctime = dir->i_mtime = ext4_current_time(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002999 ext4_mark_inode_dirty(handle, inode);
Andreas Dilgerf8628a12007-07-18 08:38:01 -04003000 ext4_dec_count(handle, dir);
Mingming Cao617ba132006-10-11 01:20:53 -07003001 ext4_update_dx_flag(dir);
3002 ext4_mark_inode_dirty(handle, dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003003
3004end_rmdir:
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003005 brelse(bh);
Theodore Ts'o8dcfaad2013-02-09 09:45:11 -05003006 if (handle)
3007 ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003008 return retval;
3009}
3010
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003011static int ext4_unlink(struct inode *dir, struct dentry *dentry)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003012{
3013 int retval;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003014 struct inode *inode;
3015 struct buffer_head *bh;
3016 struct ext4_dir_entry_2 *de;
Theodore Ts'o931b6862013-02-09 09:43:39 -05003017 handle_t *handle = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003018
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04003019 trace_ext4_unlink_enter(dir, dentry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003020 /* Initialize quotas before so that eventual writes go
3021 * in separate transaction */
Jan Karaa7cdade2015-06-29 16:22:54 +02003022 retval = dquot_initialize(dir);
3023 if (retval)
3024 return retval;
3025 retval = dquot_initialize(d_inode(dentry));
3026 if (retval)
3027 return retval;
Christoph Hellwig907f4552010-03-03 09:05:06 -05003028
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003029 retval = -ENOENT;
Tao Ma32f7f222012-12-10 14:06:01 -05003030 bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
Theodore Ts'o36de9282014-08-23 17:47:19 -04003031 if (IS_ERR(bh))
3032 return PTR_ERR(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003033 if (!bh)
3034 goto end_unlink;
3035
David Howells2b0143b2015-03-17 22:25:59 +00003036 inode = d_inode(dentry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003037
Darrick J. Wong6a797d22015-10-17 16:16:04 -04003038 retval = -EFSCORRUPTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003039 if (le32_to_cpu(de->inode) != inode->i_ino)
3040 goto end_unlink;
3041
Theodore Ts'o931b6862013-02-09 09:43:39 -05003042 handle = ext4_journal_start(dir, EXT4_HT_DIR,
Theodore Ts'o64044ab2013-02-09 15:06:24 -05003043 EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
Theodore Ts'o931b6862013-02-09 09:43:39 -05003044 if (IS_ERR(handle)) {
3045 retval = PTR_ERR(handle);
3046 handle = NULL;
3047 goto end_unlink;
3048 }
3049
3050 if (IS_DIRSYNC(dir))
3051 ext4_handle_sync(handle);
3052
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04003053 if (inode->i_nlink == 0) {
3054 ext4_warning_inode(inode, "Deleting file '%.*s' with no links",
3055 dentry->d_name.len, dentry->d_name.name);
Miklos Szeredibfe86842011-10-28 14:13:29 +02003056 set_nlink(inode, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003057 }
Mingming Cao617ba132006-10-11 01:20:53 -07003058 retval = ext4_delete_entry(handle, dir, de, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003059 if (retval)
3060 goto end_unlink;
Kalpak Shahef7f3832007-07-18 09:15:20 -04003061 dir->i_ctime = dir->i_mtime = ext4_current_time(dir);
Mingming Cao617ba132006-10-11 01:20:53 -07003062 ext4_update_dx_flag(dir);
3063 ext4_mark_inode_dirty(handle, dir);
Theodore Ts'o825f1482008-02-15 15:00:38 -05003064 drop_nlink(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003065 if (!inode->i_nlink)
Mingming Cao617ba132006-10-11 01:20:53 -07003066 ext4_orphan_add(handle, inode);
Kalpak Shahef7f3832007-07-18 09:15:20 -04003067 inode->i_ctime = ext4_current_time(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07003068 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003069
3070end_unlink:
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003071 brelse(bh);
Theodore Ts'o931b6862013-02-09 09:43:39 -05003072 if (handle)
3073 ext4_journal_stop(handle);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04003074 trace_ext4_unlink_exit(dentry, retval);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003075 return retval;
3076}
3077
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003078static int ext4_symlink(struct inode *dir,
3079 struct dentry *dentry, const char *symname)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003080{
3081 handle_t *handle;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003082 struct inode *inode;
Theodore Ts'of348c252015-04-16 01:55:00 -04003083 int err, len = strlen(symname);
Jan Karadf5e6222011-05-03 11:12:58 -04003084 int credits;
Theodore Ts'of348c252015-04-16 01:55:00 -04003085 bool encryption_required;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003086 struct fscrypt_str disk_link;
3087 struct fscrypt_symlink_data *sd = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003088
Theodore Ts'of348c252015-04-16 01:55:00 -04003089 disk_link.len = len + 1;
3090 disk_link.name = (char *) symname;
3091
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04003092 encryption_required = (ext4_encrypted_inode(dir) ||
3093 DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb)));
Theodore Ts'o4d3c4e52015-05-31 13:35:32 -04003094 if (encryption_required) {
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003095 err = fscrypt_get_encryption_info(dir);
Theodore Ts'o4d3c4e52015-05-31 13:35:32 -04003096 if (err)
3097 return err;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003098 if (!fscrypt_has_encryption_key(dir))
Eric Biggersd612bee2016-12-05 11:12:44 -08003099 return -ENOKEY;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003100 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
3101 sizeof(struct fscrypt_symlink_data));
Theodore Ts'o4d3c4e52015-05-31 13:35:32 -04003102 sd = kzalloc(disk_link.len, GFP_KERNEL);
3103 if (!sd)
3104 return -ENOMEM;
3105 }
3106
3107 if (disk_link.len > dir->i_sb->s_blocksize) {
3108 err = -ENAMETOOLONG;
3109 goto err_free_sd;
3110 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003111
Jan Karaa7cdade2015-06-29 16:22:54 +02003112 err = dquot_initialize(dir);
3113 if (err)
Dan Carpenter926631c2015-07-24 14:05:33 +03003114 goto err_free_sd;
Christoph Hellwig907f4552010-03-03 09:05:06 -05003115
Theodore Ts'of348c252015-04-16 01:55:00 -04003116 if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
Jan Karadf5e6222011-05-03 11:12:58 -04003117 /*
3118 * For non-fast symlinks, we just allocate inode and put it on
3119 * orphan list in the first transaction => we need bitmap,
Eric Sandeen8c208712011-08-11 09:54:31 -05003120 * group descriptor, sb, inode block, quota blocks, and
3121 * possibly selinux xattr blocks.
Jan Karadf5e6222011-05-03 11:12:58 -04003122 */
Eric Sandeen8c208712011-08-11 09:54:31 -05003123 credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
3124 EXT4_XATTR_TRANS_BLOCKS;
Jan Karadf5e6222011-05-03 11:12:58 -04003125 } else {
3126 /*
3127 * Fast symlink. We have to add entry to directory
3128 * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS),
3129 * allocate new inode (bitmap, group descriptor, inode block,
3130 * quota blocks, sb is already counted in previous macros).
3131 */
3132 credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
Jan Karaeb9cc7e2013-04-19 13:38:14 -04003133 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
Jan Karadf5e6222011-05-03 11:12:58 -04003134 }
Theodore Ts'of348c252015-04-16 01:55:00 -04003135
Theodore Ts'o11395752013-02-09 16:27:09 -05003136 inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
3137 &dentry->d_name, 0, NULL,
3138 EXT4_HT_DIR, credits);
3139 handle = ext4_journal_current_handle();
Theodore Ts'of348c252015-04-16 01:55:00 -04003140 if (IS_ERR(inode)) {
3141 if (handle)
3142 ext4_journal_stop(handle);
Theodore Ts'o4d3c4e52015-05-31 13:35:32 -04003143 err = PTR_ERR(inode);
3144 goto err_free_sd;
Theodore Ts'of348c252015-04-16 01:55:00 -04003145 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003146
Theodore Ts'of348c252015-04-16 01:55:00 -04003147 if (encryption_required) {
Theodore Ts'of348c252015-04-16 01:55:00 -04003148 struct qstr istr;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003149 struct fscrypt_str ostr =
3150 FSTR_INIT(sd->encrypted_path, disk_link.len);
Theodore Ts'of348c252015-04-16 01:55:00 -04003151
Theodore Ts'of348c252015-04-16 01:55:00 -04003152 istr.name = (const unsigned char *) symname;
3153 istr.len = len;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003154 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
Eric Biggersef1eb3a2016-09-15 17:25:55 -04003155 if (err)
Theodore Ts'of348c252015-04-16 01:55:00 -04003156 goto err_drop_inode;
3157 sd->len = cpu_to_le16(ostr.len);
3158 disk_link.name = (char *) sd;
Al Viroa7a67e82015-04-27 17:51:30 -04003159 inode->i_op = &ext4_encrypted_symlink_inode_operations;
Theodore Ts'of348c252015-04-16 01:55:00 -04003160 }
3161
3162 if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
Al Viroa7a67e82015-04-27 17:51:30 -04003163 if (!encryption_required)
3164 inode->i_op = &ext4_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -05003165 inode_nohighmem(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07003166 ext4_set_aops(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003167 /*
Jan Karadf5e6222011-05-03 11:12:58 -04003168 * We cannot call page_symlink() with transaction started
3169 * because it calls into ext4_write_begin() which can wait
3170 * for transaction commit if we are running out of space
3171 * and thus we deadlock. So we have to stop transaction now
3172 * and restart it when symlink contents is written.
3173 *
3174 * To keep fs consistent in case of crash, we have to put inode
3175 * to orphan list in the mean time.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003176 */
Jan Karadf5e6222011-05-03 11:12:58 -04003177 drop_nlink(inode);
3178 err = ext4_orphan_add(handle, inode);
3179 ext4_journal_stop(handle);
Theodore Ts'of348c252015-04-16 01:55:00 -04003180 handle = NULL;
Jan Karadf5e6222011-05-03 11:12:58 -04003181 if (err)
3182 goto err_drop_inode;
Theodore Ts'of348c252015-04-16 01:55:00 -04003183 err = __page_symlink(inode, disk_link.name, disk_link.len, 1);
Jan Karadf5e6222011-05-03 11:12:58 -04003184 if (err)
3185 goto err_drop_inode;
3186 /*
3187 * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS
3188 * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
3189 */
Theodore Ts'o9924a922013-02-08 21:59:22 -05003190 handle = ext4_journal_start(dir, EXT4_HT_DIR,
Jan Karadf5e6222011-05-03 11:12:58 -04003191 EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
3192 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1);
3193 if (IS_ERR(handle)) {
3194 err = PTR_ERR(handle);
Theodore Ts'of348c252015-04-16 01:55:00 -04003195 handle = NULL;
Jan Karadf5e6222011-05-03 11:12:58 -04003196 goto err_drop_inode;
3197 }
Al Viro0ce8c0102012-01-08 19:50:23 -05003198 set_nlink(inode, 1);
Jan Karadf5e6222011-05-03 11:12:58 -04003199 err = ext4_orphan_del(handle, inode);
Theodore Ts'of348c252015-04-16 01:55:00 -04003200 if (err)
Jan Karadf5e6222011-05-03 11:12:58 -04003201 goto err_drop_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003202 } else {
Aneesh Kumar K.Ve65187e2008-04-29 08:11:12 -04003203 /* clear the extent format for fast symlink */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04003204 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
Al Viro75e75662015-05-02 10:13:58 -04003205 if (!encryption_required) {
Al Viroa7a67e82015-04-27 17:51:30 -04003206 inode->i_op = &ext4_fast_symlink_inode_operations;
Al Viro75e75662015-05-02 10:13:58 -04003207 inode->i_link = (char *)&EXT4_I(inode)->i_data;
3208 }
Theodore Ts'of348c252015-04-16 01:55:00 -04003209 memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
3210 disk_link.len);
3211 inode->i_size = disk_link.len - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003212 }
Mingming Cao617ba132006-10-11 01:20:53 -07003213 EXT4_I(inode)->i_disksize = inode->i_size;
3214 err = ext4_add_nondir(handle, dentry, inode);
Theodore Ts'o11395752013-02-09 16:27:09 -05003215 if (!err && IS_DIRSYNC(dir))
3216 ext4_handle_sync(handle);
3217
Theodore Ts'o11395752013-02-09 16:27:09 -05003218 if (handle)
3219 ext4_journal_stop(handle);
Theodore Ts'of348c252015-04-16 01:55:00 -04003220 kfree(sd);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003221 return err;
Jan Karadf5e6222011-05-03 11:12:58 -04003222err_drop_inode:
Theodore Ts'of348c252015-04-16 01:55:00 -04003223 if (handle)
3224 ext4_journal_stop(handle);
Theodore Ts'of348c252015-04-16 01:55:00 -04003225 clear_nlink(inode);
Jan Karadf5e6222011-05-03 11:12:58 -04003226 unlock_new_inode(inode);
3227 iput(inode);
Theodore Ts'o4d3c4e52015-05-31 13:35:32 -04003228err_free_sd:
3229 kfree(sd);
Jan Karadf5e6222011-05-03 11:12:58 -04003230 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003231}
3232
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003233static int ext4_link(struct dentry *old_dentry,
3234 struct inode *dir, struct dentry *dentry)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003235{
3236 handle_t *handle;
David Howells2b0143b2015-03-17 22:25:59 +00003237 struct inode *inode = d_inode(old_dentry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003238 int err, retries = 0;
3239
Theodore Ts'ob05ab1d2009-08-29 21:08:08 -04003240 if (inode->i_nlink >= EXT4_LINK_MAX)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003241 return -EMLINK;
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04003242 if (ext4_encrypted_inode(dir) &&
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003243 !fscrypt_has_permitted_context(dir, inode))
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04003244 return -EPERM;
Li Xi040cb372016-01-08 16:01:21 -05003245
3246 if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
3247 (!projid_eq(EXT4_I(dir)->i_projid,
3248 EXT4_I(old_dentry->d_inode)->i_projid)))
3249 return -EXDEV;
3250
Jan Karaa7cdade2015-06-29 16:22:54 +02003251 err = dquot_initialize(dir);
3252 if (err)
3253 return err;
Christoph Hellwig907f4552010-03-03 09:05:06 -05003254
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003255retry:
Theodore Ts'o9924a922013-02-08 21:59:22 -05003256 handle = ext4_journal_start(dir, EXT4_HT_DIR,
3257 (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
Al Viroaf51a2a2013-06-29 13:23:08 +04003258 EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003259 if (IS_ERR(handle))
3260 return PTR_ERR(handle);
3261
3262 if (IS_DIRSYNC(dir))
Frank Mayhar03901312009-01-07 00:06:22 -05003263 ext4_handle_sync(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003264
Kalpak Shahef7f3832007-07-18 09:15:20 -04003265 inode->i_ctime = ext4_current_time(inode);
Andreas Dilgerf8628a12007-07-18 08:38:01 -04003266 ext4_inc_count(handle, inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -04003267 ihold(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003268
Al Viro6b38e842008-12-30 02:03:31 -05003269 err = ext4_add_entry(handle, dentry, inode);
3270 if (!err) {
3271 ext4_mark_inode_dirty(handle, inode);
Al Viroaf51a2a2013-06-29 13:23:08 +04003272 /* this can happen only for tmpfile being
3273 * linked the first time
3274 */
3275 if (inode->i_nlink == 1)
3276 ext4_orphan_del(handle, inode);
Al Viro6b38e842008-12-30 02:03:31 -05003277 d_instantiate(dentry, inode);
3278 } else {
3279 drop_nlink(inode);
3280 iput(inode);
3281 }
Mingming Cao617ba132006-10-11 01:20:53 -07003282 ext4_journal_stop(handle);
3283 if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003284 goto retry;
3285 return err;
3286}
3287
Tao Ma32f7f222012-12-10 14:06:01 -05003288
3289/*
3290 * Try to find buffer head where contains the parent block.
3291 * It should be the inode block if it is inlined or the 1st block
3292 * if it is a normal dir.
3293 */
3294static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
3295 struct inode *inode,
3296 int *retval,
3297 struct ext4_dir_entry_2 **parent_de,
3298 int *inlined)
3299{
3300 struct buffer_head *bh;
3301
3302 if (!ext4_has_inline_data(inode)) {
Theodore Ts'odc6982f2013-02-14 23:59:26 -05003303 bh = ext4_read_dirblock(inode, 0, EITHER);
3304 if (IS_ERR(bh)) {
3305 *retval = PTR_ERR(bh);
Tao Ma32f7f222012-12-10 14:06:01 -05003306 return NULL;
3307 }
3308 *parent_de = ext4_next_entry(
3309 (struct ext4_dir_entry_2 *)bh->b_data,
3310 inode->i_sb->s_blocksize);
3311 return bh;
3312 }
3313
3314 *inlined = 1;
3315 return ext4_get_first_inline_block(inode, parent_de, retval);
3316}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003317
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003318struct ext4_renament {
3319 struct inode *dir;
3320 struct dentry *dentry;
3321 struct inode *inode;
Miklos Szeredibd429982014-04-01 17:08:44 +02003322 bool is_dir;
3323 int dir_nlink_delta;
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003324
3325 /* entry for "dentry" */
3326 struct buffer_head *bh;
3327 struct ext4_dir_entry_2 *de;
3328 int inlined;
3329
3330 /* entry for ".." in inode if it's a directory */
3331 struct buffer_head *dir_bh;
3332 struct ext4_dir_entry_2 *parent_de;
3333 int dir_inlined;
3334};
3335
Miklos Szeredibd1af142014-04-01 17:08:44 +02003336static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent)
3337{
3338 int retval;
3339
3340 ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
3341 &retval, &ent->parent_de,
3342 &ent->dir_inlined);
3343 if (!ent->dir_bh)
3344 return retval;
3345 if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
Darrick J. Wong6a797d22015-10-17 16:16:04 -04003346 return -EFSCORRUPTED;
Miklos Szeredibd1af142014-04-01 17:08:44 +02003347 BUFFER_TRACE(ent->dir_bh, "get_write_access");
3348 return ext4_journal_get_write_access(handle, ent->dir_bh);
3349}
3350
3351static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
3352 unsigned dir_ino)
3353{
3354 int retval;
3355
3356 ent->parent_de->inode = cpu_to_le32(dir_ino);
3357 BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
3358 if (!ent->dir_inlined) {
3359 if (is_dx(ent->inode)) {
3360 retval = ext4_handle_dirty_dx_node(handle,
3361 ent->inode,
3362 ent->dir_bh);
3363 } else {
3364 retval = ext4_handle_dirty_dirent_node(handle,
3365 ent->inode,
3366 ent->dir_bh);
3367 }
3368 } else {
3369 retval = ext4_mark_inode_dirty(handle, ent->inode);
3370 }
3371 if (retval) {
3372 ext4_std_error(ent->dir->i_sb, retval);
3373 return retval;
3374 }
3375 return 0;
3376}
3377
3378static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
3379 unsigned ino, unsigned file_type)
3380{
3381 int retval;
3382
3383 BUFFER_TRACE(ent->bh, "get write access");
3384 retval = ext4_journal_get_write_access(handle, ent->bh);
3385 if (retval)
3386 return retval;
3387 ent->de->inode = cpu_to_le32(ino);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003388 if (ext4_has_feature_filetype(ent->dir->i_sb))
Miklos Szeredibd1af142014-04-01 17:08:44 +02003389 ent->de->file_type = file_type;
3390 ent->dir->i_version++;
3391 ent->dir->i_ctime = ent->dir->i_mtime =
3392 ext4_current_time(ent->dir);
3393 ext4_mark_inode_dirty(handle, ent->dir);
3394 BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
3395 if (!ent->inlined) {
3396 retval = ext4_handle_dirty_dirent_node(handle,
3397 ent->dir, ent->bh);
3398 if (unlikely(retval)) {
3399 ext4_std_error(ent->dir->i_sb, retval);
3400 return retval;
3401 }
3402 }
3403 brelse(ent->bh);
3404 ent->bh = NULL;
3405
3406 return 0;
3407}
3408
3409static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
3410 const struct qstr *d_name)
3411{
3412 int retval = -ENOENT;
3413 struct buffer_head *bh;
3414 struct ext4_dir_entry_2 *de;
3415
3416 bh = ext4_find_entry(dir, d_name, &de, NULL);
Theodore Ts'o36de9282014-08-23 17:47:19 -04003417 if (IS_ERR(bh))
3418 return PTR_ERR(bh);
Miklos Szeredibd1af142014-04-01 17:08:44 +02003419 if (bh) {
3420 retval = ext4_delete_entry(handle, dir, de, bh);
3421 brelse(bh);
3422 }
3423 return retval;
3424}
3425
Darrick J. Wongd80d4482014-08-27 18:40:09 -04003426static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent,
3427 int force_reread)
Miklos Szeredibd1af142014-04-01 17:08:44 +02003428{
3429 int retval;
3430 /*
3431 * ent->de could have moved from under us during htree split, so make
3432 * sure that we are deleting the right entry. We might also be pointing
3433 * to a stale entry in the unused part of ent->bh so just checking inum
3434 * and the name isn't enough.
3435 */
3436 if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
3437 ent->de->name_len != ent->dentry->d_name.len ||
3438 strncmp(ent->de->name, ent->dentry->d_name.name,
Darrick J. Wongd80d4482014-08-27 18:40:09 -04003439 ent->de->name_len) ||
3440 force_reread) {
Miklos Szeredibd1af142014-04-01 17:08:44 +02003441 retval = ext4_find_delete_entry(handle, ent->dir,
3442 &ent->dentry->d_name);
3443 } else {
3444 retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh);
3445 if (retval == -ENOENT) {
3446 retval = ext4_find_delete_entry(handle, ent->dir,
3447 &ent->dentry->d_name);
3448 }
3449 }
3450
3451 if (retval) {
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04003452 ext4_warning_inode(ent->dir,
3453 "Deleting old file: nlink %d, error=%d",
3454 ent->dir->i_nlink, retval);
Miklos Szeredibd1af142014-04-01 17:08:44 +02003455 }
3456}
3457
Miklos Szeredibd429982014-04-01 17:08:44 +02003458static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
3459{
3460 if (ent->dir_nlink_delta) {
3461 if (ent->dir_nlink_delta == -1)
3462 ext4_dec_count(handle, ent->dir);
3463 else
3464 ext4_inc_count(handle, ent->dir);
3465 ext4_mark_inode_dirty(handle, ent->dir);
3466 }
3467}
3468
Miklos Szeredicd808de2014-10-24 00:14:37 +02003469static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
3470 int credits, handle_t **h)
3471{
3472 struct inode *wh;
3473 handle_t *handle;
3474 int retries = 0;
3475
3476 /*
3477 * for inode block, sb block, group summaries,
3478 * and inode bitmap
3479 */
3480 credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
3481 EXT4_XATTR_TRANS_BLOCKS + 4);
3482retry:
3483 wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
3484 &ent->dentry->d_name, 0, NULL,
3485 EXT4_HT_DIR, credits);
3486
3487 handle = ext4_journal_current_handle();
3488 if (IS_ERR(wh)) {
3489 if (handle)
3490 ext4_journal_stop(handle);
3491 if (PTR_ERR(wh) == -ENOSPC &&
3492 ext4_should_retry_alloc(ent->dir->i_sb, &retries))
3493 goto retry;
3494 } else {
3495 *h = handle;
3496 init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
3497 wh->i_op = &ext4_special_inode_operations;
3498 }
3499 return wh;
3500}
3501
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003502/*
3503 * Anybody can rename anything with this: the permission checks are left to the
3504 * higher-level routines.
Theodore Ts'o0e202702013-08-16 22:06:53 -04003505 *
3506 * n.b. old_{dentry,inode) refers to the source dentry/inode
3507 * while new_{dentry,inode) refers to the destination dentry/inode
3508 * This comes from rename(const char *oldpath, const char *newpath)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003509 */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04003510static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
Miklos Szeredicd808de2014-10-24 00:14:37 +02003511 struct inode *new_dir, struct dentry *new_dentry,
3512 unsigned int flags)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003513{
Theodore Ts'o5b61de72013-08-16 22:06:14 -04003514 handle_t *handle = NULL;
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003515 struct ext4_renament old = {
3516 .dir = old_dir,
3517 .dentry = old_dentry,
David Howells2b0143b2015-03-17 22:25:59 +00003518 .inode = d_inode(old_dentry),
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003519 };
3520 struct ext4_renament new = {
3521 .dir = new_dir,
3522 .dentry = new_dentry,
David Howells2b0143b2015-03-17 22:25:59 +00003523 .inode = d_inode(new_dentry),
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003524 };
Darrick J. Wongd80d4482014-08-27 18:40:09 -04003525 int force_reread;
Theodore Ts'o0e202702013-08-16 22:06:53 -04003526 int retval;
Miklos Szeredicd808de2014-10-24 00:14:37 +02003527 struct inode *whiteout = NULL;
3528 int credits;
3529 u8 old_file_type;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003530
Li Xi040cb372016-01-08 16:01:21 -05003531 if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
3532 (!projid_eq(EXT4_I(new_dir)->i_projid,
3533 EXT4_I(old_dentry->d_inode)->i_projid)))
3534 return -EXDEV;
3535
Theodore Ts'o48d7b5a2016-12-28 00:22:52 -05003536 if ((ext4_encrypted_inode(old_dir) &&
3537 !fscrypt_has_encryption_key(old_dir)) ||
3538 (ext4_encrypted_inode(new_dir) &&
3539 !fscrypt_has_encryption_key(new_dir)))
3540 return -ENOKEY;
3541
Jan Karaa7cdade2015-06-29 16:22:54 +02003542 retval = dquot_initialize(old.dir);
3543 if (retval)
3544 return retval;
3545 retval = dquot_initialize(new.dir);
3546 if (retval)
3547 return retval;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003548
3549 /* Initialize quotas before so that eventual writes go
3550 * in separate transaction */
Jan Karaa7cdade2015-06-29 16:22:54 +02003551 if (new.inode) {
3552 retval = dquot_initialize(new.inode);
3553 if (retval)
3554 return retval;
3555 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003556
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003557 old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
Theodore Ts'o36de9282014-08-23 17:47:19 -04003558 if (IS_ERR(old.bh))
3559 return PTR_ERR(old.bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003560 /*
3561 * Check for inode number is _not_ due to possible IO errors.
3562 * We might rmdir the source, keep it as pwd of some process
3563 * and merrily kill the link to whatever was created under the
3564 * same name. Goodbye sticky bit ;-<
3565 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003566 retval = -ENOENT;
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003567 if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003568 goto end_rename;
3569
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04003570 if ((old.dir != new.dir) &&
3571 ext4_encrypted_inode(new.dir) &&
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003572 !fscrypt_has_permitted_context(new.dir, old.inode)) {
Theodore Ts'od9cdc9032015-04-12 00:55:08 -04003573 retval = -EPERM;
3574 goto end_rename;
3575 }
3576
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003577 new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
3578 &new.de, &new.inlined);
Theodore Ts'o36de9282014-08-23 17:47:19 -04003579 if (IS_ERR(new.bh)) {
3580 retval = PTR_ERR(new.bh);
Theodore Ts'oa9cfcd62014-09-03 09:33:00 -04003581 new.bh = NULL;
Theodore Ts'o36de9282014-08-23 17:47:19 -04003582 goto end_rename;
3583 }
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003584 if (new.bh) {
3585 if (!new.inode) {
3586 brelse(new.bh);
3587 new.bh = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003588 }
3589 }
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003590 if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
3591 ext4_alloc_da_blocks(old.inode);
Theodore Ts'o5b61de72013-08-16 22:06:14 -04003592
Miklos Szeredicd808de2014-10-24 00:14:37 +02003593 credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
3594 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
3595 if (!(flags & RENAME_WHITEOUT)) {
3596 handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
Konstantin Khlebnikov7071b712015-04-02 16:32:15 -04003597 if (IS_ERR(handle)) {
3598 retval = PTR_ERR(handle);
3599 handle = NULL;
3600 goto end_rename;
3601 }
Miklos Szeredicd808de2014-10-24 00:14:37 +02003602 } else {
3603 whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
Konstantin Khlebnikov7071b712015-04-02 16:32:15 -04003604 if (IS_ERR(whiteout)) {
3605 retval = PTR_ERR(whiteout);
3606 whiteout = NULL;
3607 goto end_rename;
3608 }
Miklos Szeredicd808de2014-10-24 00:14:37 +02003609 }
Theodore Ts'o5b61de72013-08-16 22:06:14 -04003610
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003611 if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
Theodore Ts'o5b61de72013-08-16 22:06:14 -04003612 ext4_handle_sync(handle);
3613
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003614 if (S_ISDIR(old.inode->i_mode)) {
3615 if (new.inode) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003616 retval = -ENOTEMPTY;
Michael Halcrowe875a2d2015-04-11 07:46:49 -04003617 if (!ext4_empty_dir(new.inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003618 goto end_rename;
Miklos Szeredi0d7d5d62014-04-01 17:08:44 +02003619 } else {
3620 retval = -EMLINK;
3621 if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
3622 goto end_rename;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003623 }
Miklos Szeredibd1af142014-04-01 17:08:44 +02003624 retval = ext4_rename_dir_prepare(handle, &old);
Amir Goldsteinef607892011-03-20 21:18:44 -04003625 if (retval)
3626 goto end_rename;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003627 }
Darrick J. Wongd80d4482014-08-27 18:40:09 -04003628 /*
3629 * If we're renaming a file within an inline_data dir and adding or
3630 * setting the new dirent causes a conversion from inline_data to
3631 * extents/blockmap, we need to force the dirent delete code to
3632 * re-read the directory, or else we end up trying to delete a dirent
3633 * from what is now the extent tree root (or a block map).
3634 */
3635 force_reread = (new.dir->i_ino == old.dir->i_ino &&
3636 ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
Miklos Szeredicd808de2014-10-24 00:14:37 +02003637
3638 old_file_type = old.de->file_type;
3639 if (whiteout) {
3640 /*
3641 * Do this before adding a new entry, so the old entry is sure
3642 * to be still pointing to the valid old entry.
3643 */
3644 retval = ext4_setent(handle, &old, whiteout->i_ino,
3645 EXT4_FT_CHRDEV);
3646 if (retval)
3647 goto end_rename;
3648 ext4_mark_inode_dirty(handle, whiteout);
3649 }
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003650 if (!new.bh) {
3651 retval = ext4_add_entry(handle, new.dentry, old.inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003652 if (retval)
3653 goto end_rename;
3654 } else {
Miklos Szeredibd1af142014-04-01 17:08:44 +02003655 retval = ext4_setent(handle, &new,
Miklos Szeredicd808de2014-10-24 00:14:37 +02003656 old.inode->i_ino, old_file_type);
Amir Goldsteinef607892011-03-20 21:18:44 -04003657 if (retval)
3658 goto end_rename;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003659 }
Darrick J. Wongd80d4482014-08-27 18:40:09 -04003660 if (force_reread)
3661 force_reread = !ext4_test_inode_flag(new.dir,
3662 EXT4_INODE_INLINE_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003663
3664 /*
3665 * Like most other Unix systems, set the ctime for inodes on a
3666 * rename.
3667 */
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003668 old.inode->i_ctime = ext4_current_time(old.inode);
3669 ext4_mark_inode_dirty(handle, old.inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003670
Miklos Szeredicd808de2014-10-24 00:14:37 +02003671 if (!whiteout) {
3672 /*
3673 * ok, that's it
3674 */
3675 ext4_rename_delete(handle, &old, force_reread);
3676 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003677
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003678 if (new.inode) {
3679 ext4_dec_count(handle, new.inode);
3680 new.inode->i_ctime = ext4_current_time(new.inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003681 }
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003682 old.dir->i_ctime = old.dir->i_mtime = ext4_current_time(old.dir);
3683 ext4_update_dx_flag(old.dir);
3684 if (old.dir_bh) {
Miklos Szeredibd1af142014-04-01 17:08:44 +02003685 retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
3686 if (retval)
Theodore Ts'ob4097142011-01-10 12:46:59 -05003687 goto end_rename;
Miklos Szeredibd1af142014-04-01 17:08:44 +02003688
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003689 ext4_dec_count(handle, old.dir);
3690 if (new.inode) {
Michael Halcrowe875a2d2015-04-11 07:46:49 -04003691 /* checked ext4_empty_dir above, can't have another
3692 * parent, ext4_dec_count() won't work for many-linked
3693 * dirs */
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003694 clear_nlink(new.inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003695 } else {
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003696 ext4_inc_count(handle, new.dir);
3697 ext4_update_dx_flag(new.dir);
3698 ext4_mark_inode_dirty(handle, new.dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003699 }
3700 }
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003701 ext4_mark_inode_dirty(handle, old.dir);
3702 if (new.inode) {
3703 ext4_mark_inode_dirty(handle, new.inode);
3704 if (!new.inode->i_nlink)
3705 ext4_orphan_add(handle, new.inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003706 }
3707 retval = 0;
3708
3709end_rename:
Miklos Szeredic0d268c2014-04-01 17:08:43 +02003710 brelse(old.dir_bh);
3711 brelse(old.bh);
3712 brelse(new.bh);
Miklos Szeredicd808de2014-10-24 00:14:37 +02003713 if (whiteout) {
3714 if (retval)
3715 drop_nlink(whiteout);
3716 unlock_new_inode(whiteout);
3717 iput(whiteout);
3718 }
Theodore Ts'o5b61de72013-08-16 22:06:14 -04003719 if (handle)
3720 ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003721 return retval;
3722}
3723
Miklos Szeredibd429982014-04-01 17:08:44 +02003724static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
3725 struct inode *new_dir, struct dentry *new_dentry)
3726{
3727 handle_t *handle = NULL;
3728 struct ext4_renament old = {
3729 .dir = old_dir,
3730 .dentry = old_dentry,
David Howells2b0143b2015-03-17 22:25:59 +00003731 .inode = d_inode(old_dentry),
Miklos Szeredibd429982014-04-01 17:08:44 +02003732 };
3733 struct ext4_renament new = {
3734 .dir = new_dir,
3735 .dentry = new_dentry,
David Howells2b0143b2015-03-17 22:25:59 +00003736 .inode = d_inode(new_dentry),
Miklos Szeredibd429982014-04-01 17:08:44 +02003737 };
3738 u8 new_file_type;
3739 int retval;
3740
Theodore Ts'o48d7b5a2016-12-28 00:22:52 -05003741 if ((ext4_encrypted_inode(old_dir) &&
3742 !fscrypt_has_encryption_key(old_dir)) ||
3743 (ext4_encrypted_inode(new_dir) &&
3744 !fscrypt_has_encryption_key(new_dir)))
3745 return -ENOKEY;
3746
Theodore Ts'oc2facca2015-05-31 13:35:09 -04003747 if ((ext4_encrypted_inode(old_dir) ||
3748 ext4_encrypted_inode(new_dir)) &&
3749 (old_dir != new_dir) &&
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003750 (!fscrypt_has_permitted_context(new_dir, old.inode) ||
3751 !fscrypt_has_permitted_context(old_dir, new.inode)))
Theodore Ts'oc2facca2015-05-31 13:35:09 -04003752 return -EPERM;
3753
Li Xi040cb372016-01-08 16:01:21 -05003754 if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
3755 !projid_eq(EXT4_I(new_dir)->i_projid,
3756 EXT4_I(old_dentry->d_inode)->i_projid)) ||
3757 (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
3758 !projid_eq(EXT4_I(old_dir)->i_projid,
3759 EXT4_I(new_dentry->d_inode)->i_projid)))
3760 return -EXDEV;
3761
Jan Karaa7cdade2015-06-29 16:22:54 +02003762 retval = dquot_initialize(old.dir);
3763 if (retval)
3764 return retval;
3765 retval = dquot_initialize(new.dir);
3766 if (retval)
3767 return retval;
Miklos Szeredibd429982014-04-01 17:08:44 +02003768
3769 old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
3770 &old.de, &old.inlined);
Theodore Ts'o36de9282014-08-23 17:47:19 -04003771 if (IS_ERR(old.bh))
3772 return PTR_ERR(old.bh);
Miklos Szeredibd429982014-04-01 17:08:44 +02003773 /*
3774 * Check for inode number is _not_ due to possible IO errors.
3775 * We might rmdir the source, keep it as pwd of some process
3776 * and merrily kill the link to whatever was created under the
3777 * same name. Goodbye sticky bit ;-<
3778 */
3779 retval = -ENOENT;
3780 if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
3781 goto end_rename;
3782
3783 new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
3784 &new.de, &new.inlined);
Theodore Ts'o36de9282014-08-23 17:47:19 -04003785 if (IS_ERR(new.bh)) {
3786 retval = PTR_ERR(new.bh);
Theodore Ts'oa9cfcd62014-09-03 09:33:00 -04003787 new.bh = NULL;
Theodore Ts'o36de9282014-08-23 17:47:19 -04003788 goto end_rename;
3789 }
Miklos Szeredibd429982014-04-01 17:08:44 +02003790
3791 /* RENAME_EXCHANGE case: old *and* new must both exist */
3792 if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
3793 goto end_rename;
3794
3795 handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
3796 (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
3797 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
Konstantin Khlebnikov7071b712015-04-02 16:32:15 -04003798 if (IS_ERR(handle)) {
3799 retval = PTR_ERR(handle);
3800 handle = NULL;
3801 goto end_rename;
3802 }
Miklos Szeredibd429982014-04-01 17:08:44 +02003803
3804 if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
3805 ext4_handle_sync(handle);
3806
3807 if (S_ISDIR(old.inode->i_mode)) {
3808 old.is_dir = true;
3809 retval = ext4_rename_dir_prepare(handle, &old);
3810 if (retval)
3811 goto end_rename;
3812 }
3813 if (S_ISDIR(new.inode->i_mode)) {
3814 new.is_dir = true;
3815 retval = ext4_rename_dir_prepare(handle, &new);
3816 if (retval)
3817 goto end_rename;
3818 }
3819
3820 /*
3821 * Other than the special case of overwriting a directory, parents'
3822 * nlink only needs to be modified if this is a cross directory rename.
3823 */
3824 if (old.dir != new.dir && old.is_dir != new.is_dir) {
3825 old.dir_nlink_delta = old.is_dir ? -1 : 1;
3826 new.dir_nlink_delta = -old.dir_nlink_delta;
3827 retval = -EMLINK;
3828 if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
3829 (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
3830 goto end_rename;
3831 }
3832
3833 new_file_type = new.de->file_type;
3834 retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
3835 if (retval)
3836 goto end_rename;
3837
3838 retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
3839 if (retval)
3840 goto end_rename;
3841
3842 /*
3843 * Like most other Unix systems, set the ctime for inodes on a
3844 * rename.
3845 */
3846 old.inode->i_ctime = ext4_current_time(old.inode);
3847 new.inode->i_ctime = ext4_current_time(new.inode);
3848 ext4_mark_inode_dirty(handle, old.inode);
3849 ext4_mark_inode_dirty(handle, new.inode);
3850
3851 if (old.dir_bh) {
3852 retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
3853 if (retval)
3854 goto end_rename;
3855 }
3856 if (new.dir_bh) {
3857 retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
3858 if (retval)
3859 goto end_rename;
3860 }
3861 ext4_update_dir_count(handle, &old);
3862 ext4_update_dir_count(handle, &new);
3863 retval = 0;
3864
3865end_rename:
3866 brelse(old.dir_bh);
3867 brelse(new.dir_bh);
3868 brelse(old.bh);
3869 brelse(new.bh);
3870 if (handle)
3871 ext4_journal_stop(handle);
3872 return retval;
3873}
3874
Miklos Szeredi0a7c3932014-04-01 17:08:43 +02003875static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
3876 struct inode *new_dir, struct dentry *new_dentry,
3877 unsigned int flags)
3878{
Miklos Szeredicd808de2014-10-24 00:14:37 +02003879 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
Miklos Szeredi0a7c3932014-04-01 17:08:43 +02003880 return -EINVAL;
3881
Miklos Szeredibd429982014-04-01 17:08:44 +02003882 if (flags & RENAME_EXCHANGE) {
3883 return ext4_cross_rename(old_dir, old_dentry,
3884 new_dir, new_dentry);
3885 }
Miklos Szeredicd808de2014-10-24 00:14:37 +02003886
3887 return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
Miklos Szeredi0a7c3932014-04-01 17:08:43 +02003888}
3889
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003890/*
3891 * directories can handle most operations...
3892 */
Arjan van de Ven754661f2007-02-12 00:55:38 -08003893const struct inode_operations ext4_dir_inode_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -07003894 .create = ext4_create,
3895 .lookup = ext4_lookup,
3896 .link = ext4_link,
3897 .unlink = ext4_unlink,
3898 .symlink = ext4_symlink,
3899 .mkdir = ext4_mkdir,
3900 .rmdir = ext4_rmdir,
3901 .mknod = ext4_mknod,
Al Viroaf51a2a2013-06-29 13:23:08 +04003902 .tmpfile = ext4_tmpfile,
Miklos Szeredi2773bf02016-09-27 11:03:58 +02003903 .rename = ext4_rename2,
Mingming Cao617ba132006-10-11 01:20:53 -07003904 .setattr = ext4_setattr,
Mingming Cao617ba132006-10-11 01:20:53 -07003905 .listxattr = ext4_listxattr,
Christoph Hellwig4e34e712011-07-23 17:37:31 +02003906 .get_acl = ext4_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -08003907 .set_acl = ext4_set_acl,
Aneesh Kumar K.Vabc87462009-05-02 22:54:32 -04003908 .fiemap = ext4_fiemap,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003909};
3910
Arjan van de Ven754661f2007-02-12 00:55:38 -08003911const struct inode_operations ext4_special_inode_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -07003912 .setattr = ext4_setattr,
Mingming Cao617ba132006-10-11 01:20:53 -07003913 .listxattr = ext4_listxattr,
Christoph Hellwig4e34e712011-07-23 17:37:31 +02003914 .get_acl = ext4_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -08003915 .set_acl = ext4_set_acl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003916};