blob: 487527b42d94a381d329d8be5ae4459cafabe15b [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10/*
Steven Whitehouse61e085a2006-04-24 10:07:13 -040011 * Implements Extendible Hashing as described in:
12 * "Extendible Hashing" by Fagin, et al in
13 * __ACM Trans. on Database Systems__, Sept 1979.
14 *
15 *
16 * Here's the layout of dirents which is essentially the same as that of ext2
17 * within a single block. The field de_name_len is the number of bytes
18 * actually required for the name (no null terminator). The field de_rec_len
19 * is the number of bytes allocated to the dirent. The offset of the next
20 * dirent in the block is (dirent + dirent->de_rec_len). When a dirent is
21 * deleted, the preceding dirent inherits its allocated space, ie
22 * prev->de_rec_len += deleted->de_rec_len. Since the next dirent is obtained
23 * by adding de_rec_len to the current dirent, this essentially causes the
24 * deleted dirent to get jumped over when iterating through all the dirents.
25 *
26 * When deleting the first dirent in a block, there is no previous dirent so
27 * the field de_ino is set to zero to designate it as deleted. When allocating
28 * a dirent, gfs2_dirent_alloc iterates through the dirents in a block. If the
29 * first dirent has (de_ino == 0) and de_rec_len is large enough, this first
30 * dirent is allocated. Otherwise it must go through all the 'used' dirents
31 * searching for one in which the amount of total space minus the amount of
32 * used space will provide enough space for the new dirent.
33 *
34 * There are two types of blocks in which dirents reside. In a stuffed dinode,
35 * the dirents begin at offset sizeof(struct gfs2_dinode) from the beginning of
36 * the block. In leaves, they begin at offset sizeof(struct gfs2_leaf) from the
37 * beginning of the leaf block. The dirents reside in leaves when
38 *
Steven Whitehouse383f01f2008-11-04 10:05:22 +000039 * dip->i_diskflags & GFS2_DIF_EXHASH is true
Steven Whitehouse61e085a2006-04-24 10:07:13 -040040 *
41 * Otherwise, the dirents are "linear", within a single stuffed dinode block.
42 *
43 * When the dirents are in leaves, the actual contents of the directory file are
44 * used as an array of 64-bit block pointers pointing to the leaf blocks. The
45 * dirents are NOT in the directory file itself. There can be more than one
46 * block pointer in the array that points to the same leaf. In fact, when a
47 * directory is first converted from linear to exhash, all of the pointers
48 * point to the same leaf.
49 *
50 * When a leaf is completely full, the size of the hash table can be
51 * doubled unless it is already at the maximum size which is hard coded into
52 * GFS2_DIR_MAX_DEPTH. After that, leaves are chained together in a linked list,
53 * but never before the maximum hash table size has been reached.
54 */
David Teiglandb3b94fa2006-01-16 16:50:04 +000055
Joe Perchesd77d1b52014-03-06 12:10:45 -080056#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
57
David Teiglandb3b94fa2006-01-16 16:50:04 +000058#include <linux/slab.h>
59#include <linux/spinlock.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000060#include <linux/buffer_head.h>
61#include <linux/sort.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050062#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050063#include <linux/crc32.h>
Steven Whitehousefe1bded2006-04-18 10:09:15 -040064#include <linux/vmalloc.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000065
66#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050067#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000068#include "dir.h"
69#include "glock.h"
70#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000071#include "meta_io.h"
72#include "quota.h"
73#include "rgrp.h"
74#include "trans.h"
Steven Whitehousee13940b2006-01-30 13:31:50 +000075#include "bmap.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050076#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000077
78#define IS_LEAF 1 /* Hashed (leaf) directory */
79#define IS_DINODE 2 /* Linear (stuffed dinode block) directory */
80
Bob Petersondfe4d342011-10-27 12:16:06 -040081#define MAX_RA_BLOCKS 32 /* max read-ahead blocks */
82
Steven Whitehousecd915492006-09-04 12:49:07 -040083#define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1)
84#define gfs2_dir_offset2hash(p) ((u32)(((u64)(p)) << 1))
David Teiglandb3b94fa2006-01-16 16:50:04 +000085
Steven Whitehouse8d123582010-09-17 12:30:23 +010086struct qstr gfs2_qdot __read_mostly;
87struct qstr gfs2_qdotdot __read_mostly;
88
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040089typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent,
90 const struct qstr *name, void *opaque);
David Teiglandb3b94fa2006-01-16 16:50:04 +000091
Steven Whitehousecd915492006-09-04 12:49:07 -040092int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -040093 struct buffer_head **bhp)
Steven Whitehousee13940b2006-01-30 13:31:50 +000094{
95 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +000096
Steven Whitehouse61e085a2006-04-24 10:07:13 -040097 bh = gfs2_meta_new(ip->i_gl, block);
Steven Whitehouse350a9b02012-12-14 12:36:02 +000098 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse61e085a2006-04-24 10:07:13 -040099 gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD);
100 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
Steven Whitehousee13940b2006-01-30 13:31:50 +0000101 *bhp = bh;
102 return 0;
103}
104
Steven Whitehousecd915492006-09-04 12:49:07 -0400105static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400106 struct buffer_head **bhp)
107{
108 struct buffer_head *bh;
109 int error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000110
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400111 error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, &bh);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400112 if (error)
113 return error;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400114 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) {
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400115 brelse(bh);
116 return -EIO;
117 }
118 *bhp = bh;
119 return 0;
120}
Steven Whitehousee13940b2006-01-30 13:31:50 +0000121
122static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf,
123 unsigned int offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000124{
125 struct buffer_head *dibh;
126 int error;
127
128 error = gfs2_meta_inode_buffer(ip, &dibh);
129 if (error)
130 return error;
131
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000132 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500133 memcpy(dibh->b_data + offset + sizeof(struct gfs2_dinode), buf, size);
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100134 if (ip->i_inode.i_size < offset + size)
135 i_size_write(&ip->i_inode, offset + size);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100136 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500137 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000138
139 brelse(dibh);
140
141 return size;
142}
143
144
145
146/**
147 * gfs2_dir_write_data - Write directory information to the inode
148 * @ip: The GFS2 inode
149 * @buf: The buffer containing information to be written
150 * @offset: The file offset to start writing at
151 * @size: The amount of data to write
152 *
153 * Returns: The number of bytes correctly written or error code
154 */
155static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
Steven Whitehousecd915492006-09-04 12:49:07 -0400156 u64 offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000157{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400158 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000159 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400160 u64 lblock, dblock;
161 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000162 unsigned int o;
163 int copied = 0;
164 int error = 0;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000165 int new = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000166
167 if (!size)
168 return 0;
169
170 if (gfs2_is_stuffed(ip) &&
171 offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500172 return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset,
173 size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000174
175 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
176 return -EINVAL;
177
178 if (gfs2_is_stuffed(ip)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400179 error = gfs2_unstuff_dinode(ip, NULL);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000180 if (error)
Steven Whitehousec7526662006-03-20 12:30:04 -0500181 return error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000182 }
183
184 lblock = offset;
185 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
186
187 while (copied < size) {
188 unsigned int amount;
189 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000190
191 amount = size - copied;
192 if (amount > sdp->sd_sb.sb_bsize - o)
193 amount = sdp->sd_sb.sb_bsize - o;
194
195 if (!extlen) {
196 new = 1;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400197 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400198 &dblock, &extlen);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000199 if (error)
200 goto fail;
201 error = -EIO;
202 if (gfs2_assert_withdraw(sdp, dblock))
203 goto fail;
204 }
205
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400206 if (amount == sdp->sd_jbsize || new)
207 error = gfs2_dir_get_new_buffer(ip, dblock, &bh);
208 else
209 error = gfs2_dir_get_existing_buffer(ip, dblock, &bh);
210
Steven Whitehousee13940b2006-01-30 13:31:50 +0000211 if (error)
212 goto fail;
213
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000214 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000215 memcpy(bh->b_data + o, buf, amount);
216 brelse(bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000217
Steven Whitehouse899bb262006-08-01 15:28:57 -0400218 buf += amount;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000219 copied += amount;
220 lblock++;
221 dblock++;
222 extlen--;
223
224 o = sizeof(struct gfs2_meta_header);
225 }
226
227out:
228 error = gfs2_meta_inode_buffer(ip, &dibh);
229 if (error)
230 return error;
231
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100232 if (ip->i_inode.i_size < offset + copied)
233 i_size_write(&ip->i_inode, offset + copied);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100234 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000235
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000236 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500237 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000238 brelse(dibh);
239
240 return copied;
241fail:
242 if (copied)
243 goto out;
244 return error;
245}
246
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100247static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, __be64 *buf,
248 unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000249{
250 struct buffer_head *dibh;
251 int error;
252
253 error = gfs2_meta_inode_buffer(ip, &dibh);
254 if (!error) {
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100255 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000256 brelse(dibh);
257 }
258
259 return (error) ? error : size;
260}
261
262
263/**
264 * gfs2_dir_read_data - Read a data from a directory inode
265 * @ip: The GFS2 Inode
266 * @buf: The buffer to place result into
Steven Whitehousee13940b2006-01-30 13:31:50 +0000267 * @size: Amount of data to transfer
268 *
269 * Returns: The amount of data actually copied or the error
270 */
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100271static int gfs2_dir_read_data(struct gfs2_inode *ip, __be64 *buf,
272 unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000273{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400274 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousecd915492006-09-04 12:49:07 -0400275 u64 lblock, dblock;
276 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000277 unsigned int o;
278 int copied = 0;
279 int error = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000280
281 if (gfs2_is_stuffed(ip))
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100282 return gfs2_dir_read_stuffed(ip, buf, size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000283
284 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
285 return -EINVAL;
286
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100287 lblock = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000288 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
289
290 while (copied < size) {
291 unsigned int amount;
292 struct buffer_head *bh;
293 int new;
294
295 amount = size - copied;
296 if (amount > sdp->sd_sb.sb_bsize - o)
297 amount = sdp->sd_sb.sb_bsize - o;
298
299 if (!extlen) {
300 new = 0;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400301 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400302 &dblock, &extlen);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400303 if (error || !dblock)
304 goto fail;
305 BUG_ON(extlen < 1);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400306 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
Adrian Bunkb7d8ac32006-10-19 16:02:07 +0200307 } else {
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400308 error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, &bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000309 if (error)
310 goto fail;
311 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400312 error = gfs2_metatype_check(sdp, bh, GFS2_METATYPE_JD);
313 if (error) {
314 brelse(bh);
315 goto fail;
316 }
317 dblock++;
318 extlen--;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000319 memcpy(buf, bh->b_data + o, amount);
320 brelse(bh);
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100321 buf += (amount/sizeof(__be64));
Steven Whitehousee13940b2006-01-30 13:31:50 +0000322 copied += amount;
323 lblock++;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000324 o = sizeof(struct gfs2_meta_header);
325 }
326
327 return copied;
328fail:
329 return (copied) ? copied : error;
330}
331
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100332/**
333 * gfs2_dir_get_hash_table - Get pointer to the dir hash table
334 * @ip: The inode in question
335 *
336 * Returns: The hash table or an error
337 */
338
339static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
340{
341 struct inode *inode = &ip->i_inode;
342 int ret;
343 u32 hsize;
344 __be64 *hc;
345
346 BUG_ON(!(ip->i_diskflags & GFS2_DIF_EXHASH));
347
348 hc = ip->i_hash_cache;
349 if (hc)
350 return hc;
351
352 hsize = 1 << ip->i_depth;
353 hsize *= sizeof(__be64);
354 if (hsize != i_size_read(&ip->i_inode)) {
355 gfs2_consist_inode(ip);
356 return ERR_PTR(-EIO);
357 }
358
Bob Petersone8830d82013-05-30 09:48:56 -0400359 hc = kmalloc(hsize, GFP_NOFS | __GFP_NOWARN);
360 if (hc == NULL)
361 hc = __vmalloc(hsize, GFP_NOFS, PAGE_KERNEL);
362
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100363 if (hc == NULL)
364 return ERR_PTR(-ENOMEM);
365
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100366 ret = gfs2_dir_read_data(ip, hc, hsize);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100367 if (ret < 0) {
Al Viro3cdcf632014-11-20 05:18:38 +0000368 kvfree(hc);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100369 return ERR_PTR(ret);
370 }
371
372 spin_lock(&inode->i_lock);
Al Viro9265f1d2014-11-20 05:19:47 +0000373 if (likely(!ip->i_hash_cache)) {
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100374 ip->i_hash_cache = hc;
Al Viro9265f1d2014-11-20 05:19:47 +0000375 hc = NULL;
376 }
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100377 spin_unlock(&inode->i_lock);
Al Viro9265f1d2014-11-20 05:19:47 +0000378 kvfree(hc);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100379
380 return ip->i_hash_cache;
381}
382
383/**
384 * gfs2_dir_hash_inval - Invalidate dir hash
385 * @ip: The directory inode
386 *
387 * Must be called with an exclusive glock, or during glock invalidation.
388 */
389void gfs2_dir_hash_inval(struct gfs2_inode *ip)
390{
391 __be64 *hc = ip->i_hash_cache;
392 ip->i_hash_cache = NULL;
Al Viro3cdcf632014-11-20 05:18:38 +0000393 kvfree(hc);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100394}
395
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500396static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent)
397{
398 return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0;
399}
400
Steven Whitehousec7526662006-03-20 12:30:04 -0500401static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent,
402 const struct qstr *name, int ret)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000403{
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500404 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500405 be32_to_cpu(dent->de_hash) == name->hash &&
406 be16_to_cpu(dent->de_name_len) == name->len &&
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400407 memcmp(dent+1, name->name, name->len) == 0)
Steven Whitehousec7526662006-03-20 12:30:04 -0500408 return ret;
409 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000410}
411
Steven Whitehousec7526662006-03-20 12:30:04 -0500412static int gfs2_dirent_find(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500413 const struct qstr *name,
414 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500415{
416 return __gfs2_dirent_find(dent, name, 1);
417}
418
419static int gfs2_dirent_prev(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500420 const struct qstr *name,
421 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500422{
423 return __gfs2_dirent_find(dent, name, 2);
424}
425
426/*
427 * name->name holds ptr to start of block.
428 * name->len holds size of block.
429 */
430static int gfs2_dirent_last(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500431 const struct qstr *name,
432 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500433{
434 const char *start = name->name;
435 const char *end = (const char *)dent + be16_to_cpu(dent->de_rec_len);
436 if (name->len == (end - start))
437 return 1;
438 return 0;
439}
440
441static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500442 const struct qstr *name,
443 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500444{
445 unsigned required = GFS2_DIRENT_SIZE(name->len);
446 unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
447 unsigned totlen = be16_to_cpu(dent->de_rec_len);
448
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500449 if (gfs2_dirent_sentinel(dent))
Bob Peterson728a7562010-07-14 18:12:26 -0400450 actual = 0;
Jan Engelhardtc53921242006-09-05 14:30:40 +0200451 if (totlen - actual >= required)
Steven Whitehousec7526662006-03-20 12:30:04 -0500452 return 1;
453 return 0;
454}
455
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500456struct dirent_gather {
457 const struct gfs2_dirent **pdent;
458 unsigned offset;
459};
460
461static int gfs2_dirent_gather(const struct gfs2_dirent *dent,
462 const struct qstr *name,
463 void *opaque)
464{
465 struct dirent_gather *g = opaque;
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500466 if (!gfs2_dirent_sentinel(dent)) {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500467 g->pdent[g->offset++] = dent;
468 }
469 return 0;
470}
471
Steven Whitehousec7526662006-03-20 12:30:04 -0500472/*
473 * Other possible things to check:
474 * - Inode located within filesystem size (and on valid block)
475 * - Valid directory entry type
476 * Not sure how heavy-weight we want to make this... could also check
477 * hash is correct for example, but that would take a lot of extra time.
478 * For now the most important thing is to check that the various sizes
479 * are correct.
480 */
481static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset,
482 unsigned int size, unsigned int len, int first)
483{
484 const char *msg = "gfs2_dirent too small";
485 if (unlikely(size < sizeof(struct gfs2_dirent)))
486 goto error;
487 msg = "gfs2_dirent misaligned";
488 if (unlikely(offset & 0x7))
489 goto error;
490 msg = "gfs2_dirent points beyond end of block";
491 if (unlikely(offset + size > len))
492 goto error;
493 msg = "zero inode number";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500494 if (unlikely(!first && gfs2_dirent_sentinel(dent)))
Steven Whitehousec7526662006-03-20 12:30:04 -0500495 goto error;
496 msg = "name length is greater than space in dirent";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500497 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500498 unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) >
499 size))
500 goto error;
501 return 0;
502error:
Joe Perchesd77d1b52014-03-06 12:10:45 -0800503 pr_warn("%s: %s (%s)\n",
504 __func__, msg, first ? "first in block" : "not first in block");
Steven Whitehousec7526662006-03-20 12:30:04 -0500505 return -EIO;
506}
507
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500508static int gfs2_dirent_offset(const void *buf)
Steven Whitehousec7526662006-03-20 12:30:04 -0500509{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500510 const struct gfs2_meta_header *h = buf;
511 int offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500512
513 BUG_ON(buf == NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500514
Steven Whitehousee3167de2006-03-30 15:46:23 -0500515 switch(be32_to_cpu(h->mh_type)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500516 case GFS2_METATYPE_LF:
517 offset = sizeof(struct gfs2_leaf);
518 break;
519 case GFS2_METATYPE_DI:
520 offset = sizeof(struct gfs2_dinode);
521 break;
522 default:
523 goto wrong_type;
524 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500525 return offset;
526wrong_type:
Joe Perchesd77d1b52014-03-06 12:10:45 -0800527 pr_warn("%s: wrong block type %u\n", __func__, be32_to_cpu(h->mh_type));
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500528 return -1;
529}
Steven Whitehousec7526662006-03-20 12:30:04 -0500530
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400531static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500532 unsigned int len, gfs2_dscan_t scan,
533 const struct qstr *name,
534 void *opaque)
535{
536 struct gfs2_dirent *dent, *prev;
537 unsigned offset;
538 unsigned size;
539 int ret = 0;
540
541 ret = gfs2_dirent_offset(buf);
542 if (ret < 0)
543 goto consist_inode;
544
545 offset = ret;
Steven Whitehousec7526662006-03-20 12:30:04 -0500546 prev = NULL;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400547 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500548 size = be16_to_cpu(dent->de_rec_len);
549 if (gfs2_check_dirent(dent, offset, size, len, 1))
550 goto consist_inode;
551 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500552 ret = scan(dent, name, opaque);
Steven Whitehousec7526662006-03-20 12:30:04 -0500553 if (ret)
554 break;
555 offset += size;
556 if (offset == len)
557 break;
558 prev = dent;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400559 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500560 size = be16_to_cpu(dent->de_rec_len);
561 if (gfs2_check_dirent(dent, offset, size, len, 0))
562 goto consist_inode;
563 } while(1);
564
565 switch(ret) {
566 case 0:
567 return NULL;
568 case 1:
569 return dent;
570 case 2:
571 return prev ? prev : dent;
572 default:
573 BUG_ON(ret > 0);
574 return ERR_PTR(ret);
575 }
576
Steven Whitehousec7526662006-03-20 12:30:04 -0500577consist_inode:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400578 gfs2_consist_inode(GFS2_I(inode));
Steven Whitehousec7526662006-03-20 12:30:04 -0500579 return ERR_PTR(-EIO);
580}
581
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400582static int dirent_check_reclen(struct gfs2_inode *dip,
583 const struct gfs2_dirent *d, const void *end_p)
584{
585 const void *ptr = d;
586 u16 rec_len = be16_to_cpu(d->de_rec_len);
587
588 if (unlikely(rec_len < sizeof(struct gfs2_dirent)))
589 goto broken;
590 ptr += rec_len;
591 if (ptr < end_p)
592 return rec_len;
593 if (ptr == end_p)
594 return -ENOENT;
595broken:
596 gfs2_consist_inode(dip);
597 return -EIO;
598}
599
David Teiglandb3b94fa2006-01-16 16:50:04 +0000600/**
601 * dirent_next - Next dirent
602 * @dip: the directory
603 * @bh: The buffer
604 * @dent: Pointer to list of dirents
605 *
606 * Returns: 0 on success, error code otherwise
607 */
608
609static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
610 struct gfs2_dirent **dent)
611{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400612 struct gfs2_dirent *cur = *dent, *tmp;
613 char *bh_end = bh->b_data + bh->b_size;
614 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000615
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400616 ret = dirent_check_reclen(dip, cur, bh_end);
617 if (ret < 0)
618 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000619
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400620 tmp = (void *)cur + ret;
621 ret = dirent_check_reclen(dip, tmp, bh_end);
622 if (ret == -EIO)
623 return ret;
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000624
David Teiglandb3b94fa2006-01-16 16:50:04 +0000625 /* Only the first dent could ever have de_inum.no_addr == 0 */
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500626 if (gfs2_dirent_sentinel(tmp)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000627 gfs2_consist_inode(dip);
628 return -EIO;
629 }
630
631 *dent = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000632 return 0;
633}
634
635/**
636 * dirent_del - Delete a dirent
637 * @dip: The GFS2 inode
638 * @bh: The buffer
639 * @prev: The previous dirent
640 * @cur: The current dirent
641 *
642 */
643
644static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
645 struct gfs2_dirent *prev, struct gfs2_dirent *cur)
646{
Steven Whitehousecd915492006-09-04 12:49:07 -0400647 u16 cur_rec_len, prev_rec_len;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000648
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500649 if (gfs2_dirent_sentinel(cur)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000650 gfs2_consist_inode(dip);
651 return;
652 }
653
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000654 gfs2_trans_add_meta(dip->i_gl, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000655
656 /* If there is no prev entry, this is the first entry in the block.
657 The de_rec_len is already as big as it needs to be. Just zero
658 out the inode number and return. */
659
660 if (!prev) {
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500661 cur->de_inum.no_addr = 0;
662 cur->de_inum.no_formal_ino = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000663 return;
664 }
665
666 /* Combine this dentry with the previous one. */
667
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000668 prev_rec_len = be16_to_cpu(prev->de_rec_len);
669 cur_rec_len = be16_to_cpu(cur->de_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000670
671 if ((char *)prev + prev_rec_len != (char *)cur)
672 gfs2_consist_inode(dip);
673 if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size)
674 gfs2_consist_inode(dip);
675
676 prev_rec_len += cur_rec_len;
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000677 prev->de_rec_len = cpu_to_be16(prev_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000678}
679
Steven Whitehousec7526662006-03-20 12:30:04 -0500680/*
681 * Takes a dent from which to grab space as an argument. Returns the
682 * newly created dent.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000683 */
Adrian Bunk08bc2db2006-04-28 10:59:12 -0400684static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
685 struct gfs2_dirent *dent,
686 const struct qstr *name,
687 struct buffer_head *bh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000688{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400689 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -0500690 struct gfs2_dirent *ndent;
691 unsigned offset = 0, totlen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000692
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500693 if (!gfs2_dirent_sentinel(dent))
Steven Whitehousec7526662006-03-20 12:30:04 -0500694 offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
695 totlen = be16_to_cpu(dent->de_rec_len);
696 BUG_ON(offset + name->len > totlen);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000697 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500698 ndent = (struct gfs2_dirent *)((char *)dent + offset);
699 dent->de_rec_len = cpu_to_be16(offset);
700 gfs2_qstr2dirent(name, totlen - offset, ndent);
701 return ndent;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000702}
703
Steven Whitehousec7526662006-03-20 12:30:04 -0500704static struct gfs2_dirent *gfs2_dirent_alloc(struct inode *inode,
705 struct buffer_head *bh,
706 const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000707{
708 struct gfs2_dirent *dent;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400709 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500710 gfs2_dirent_find_space, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500711 if (!dent || IS_ERR(dent))
712 return dent;
713 return gfs2_init_dirent(inode, dent, name, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000714}
715
Steven Whitehousecd915492006-09-04 12:49:07 -0400716static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000717 struct buffer_head **bhp)
718{
719 int error;
720
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400721 error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, bhp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400722 if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
Joe Perchesd77d1b52014-03-06 12:10:45 -0800723 /* pr_info("block num=%llu\n", leaf_no); */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000724 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400725 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000726
727 return error;
728}
729
730/**
731 * get_leaf_nr - Get a leaf number associated with the index
732 * @dip: The GFS2 inode
733 * @index:
734 * @leaf_out:
735 *
736 * Returns: 0 on success, error code otherwise
737 */
738
Steven Whitehousecd915492006-09-04 12:49:07 -0400739static int get_leaf_nr(struct gfs2_inode *dip, u32 index,
740 u64 *leaf_out)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000741{
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100742 __be64 *hash;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000743
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100744 hash = gfs2_dir_get_hash_table(dip);
745 if (IS_ERR(hash))
746 return PTR_ERR(hash);
747 *leaf_out = be64_to_cpu(*(hash + index));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000748 return 0;
749}
750
Steven Whitehousecd915492006-09-04 12:49:07 -0400751static int get_first_leaf(struct gfs2_inode *dip, u32 index,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000752 struct buffer_head **bh_out)
753{
Steven Whitehousecd915492006-09-04 12:49:07 -0400754 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000755 int error;
756
757 error = get_leaf_nr(dip, index, &leaf_no);
758 if (!error)
759 error = get_leaf(dip, leaf_no, bh_out);
760
761 return error;
762}
763
Steven Whitehousec7526662006-03-20 12:30:04 -0500764static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
765 const struct qstr *name,
766 gfs2_dscan_t scan,
767 struct buffer_head **pbh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000768{
Steven Whitehousec7526662006-03-20 12:30:04 -0500769 struct buffer_head *bh;
770 struct gfs2_dirent *dent;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400771 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000772 int error;
773
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000774 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500775 struct gfs2_leaf *leaf;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000776 unsigned hsize = 1 << ip->i_depth;
Steven Whitehousec7526662006-03-20 12:30:04 -0500777 unsigned index;
778 u64 ln;
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100779 if (hsize * sizeof(u64) != i_size_read(inode)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500780 gfs2_consist_inode(ip);
781 return ERR_PTR(-EIO);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000782 }
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400783
Steven Whitehouse9a004502008-02-01 09:23:44 +0000784 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500785 error = get_first_leaf(ip, index, &bh);
786 if (error)
787 return ERR_PTR(error);
788 do {
789 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500790 scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500791 if (dent)
792 goto got_dent;
793 leaf = (struct gfs2_leaf *)bh->b_data;
794 ln = be64_to_cpu(leaf->lf_next);
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400795 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500796 if (!ln)
797 break;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400798
Steven Whitehousec7526662006-03-20 12:30:04 -0500799 error = get_leaf(ip, ln, &bh);
800 } while(!error);
801
802 return error ? ERR_PTR(error) : NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000803 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000804
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400805
Steven Whitehousec7526662006-03-20 12:30:04 -0500806 error = gfs2_meta_inode_buffer(ip, &bh);
807 if (error)
808 return ERR_PTR(error);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500809 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500810got_dent:
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400811 if (unlikely(dent == NULL || IS_ERR(dent))) {
Steven Whitehouseed386502006-04-07 16:28:07 -0400812 brelse(bh);
813 bh = NULL;
814 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500815 *pbh = bh;
816 return dent;
817}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000818
Steven Whitehousec7526662006-03-20 12:30:04 -0500819static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth)
820{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400821 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000822 unsigned int n = 1;
Steven Whitehouse09010972009-05-20 10:48:47 +0100823 u64 bn;
824 int error;
825 struct buffer_head *bh;
Steven Whitehousec7526662006-03-20 12:30:04 -0500826 struct gfs2_leaf *leaf;
827 struct gfs2_dirent *dent;
Linus Torvalds26fe5752012-05-10 13:14:12 -0700828 struct qstr name = { .name = "" };
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +0000829 struct timespec tv = CURRENT_TIME;
Steven Whitehouse09010972009-05-20 10:48:47 +0100830
Bob Peterson6e87ed02011-11-18 10:58:32 -0500831 error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100832 if (error)
833 return NULL;
834 bh = gfs2_meta_new(ip->i_gl, bn);
Steven Whitehousec7526662006-03-20 12:30:04 -0500835 if (!bh)
836 return NULL;
Steven Whitehouse09010972009-05-20 10:48:47 +0100837
Steven Whitehouse5731be52008-02-01 13:16:55 +0000838 gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000839 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500840 gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
841 leaf = (struct gfs2_leaf *)bh->b_data;
842 leaf->lf_depth = cpu_to_be16(depth);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400843 leaf->lf_entries = 0;
Al Viroa2d7d022006-10-14 16:49:30 +0100844 leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400845 leaf->lf_next = 0;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +0000846 leaf->lf_inode = cpu_to_be64(ip->i_no_addr);
847 leaf->lf_dist = cpu_to_be32(1);
848 leaf->lf_nsec = cpu_to_be32(tv.tv_nsec);
849 leaf->lf_sec = cpu_to_be64(tv.tv_sec);
850 memset(leaf->lf_reserved2, 0, sizeof(leaf->lf_reserved2));
Steven Whitehousec7526662006-03-20 12:30:04 -0500851 dent = (struct gfs2_dirent *)(leaf+1);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500852 gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent);
Steven Whitehousec7526662006-03-20 12:30:04 -0500853 *pbh = bh;
854 return leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000855}
856
857/**
858 * dir_make_exhash - Convert a stuffed directory into an ExHash directory
859 * @dip: The GFS2 inode
860 *
861 * Returns: 0 on success, error code otherwise
862 */
863
Steven Whitehousec7526662006-03-20 12:30:04 -0500864static int dir_make_exhash(struct inode *inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000865{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400866 struct gfs2_inode *dip = GFS2_I(inode);
867 struct gfs2_sbd *sdp = GFS2_SB(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000868 struct gfs2_dirent *dent;
Steven Whitehousec7526662006-03-20 12:30:04 -0500869 struct qstr args;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000870 struct buffer_head *bh, *dibh;
871 struct gfs2_leaf *leaf;
872 int y;
Steven Whitehousecd915492006-09-04 12:49:07 -0400873 u32 x;
Al Virob44b84d2006-10-14 10:46:30 -0400874 __be64 *lp;
875 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000876 int error;
877
878 error = gfs2_meta_inode_buffer(dip, &dibh);
879 if (error)
880 return error;
881
David Teiglandb3b94fa2006-01-16 16:50:04 +0000882 /* Turn over a new leaf */
883
Steven Whitehousec7526662006-03-20 12:30:04 -0500884 leaf = new_leaf(inode, &bh, 0);
885 if (!leaf)
886 return -ENOSPC;
887 bn = bh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000888
Steven Whitehousead6203f2008-11-03 13:59:19 +0000889 gfs2_assert(sdp, dip->i_entries < (1 << 16));
890 leaf->lf_entries = cpu_to_be16(dip->i_entries);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000891
892 /* Copy dirents */
893
894 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh,
895 sizeof(struct gfs2_dinode));
896
897 /* Find last entry */
898
899 x = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500900 args.len = bh->b_size - sizeof(struct gfs2_dinode) +
901 sizeof(struct gfs2_leaf);
902 args.name = bh->b_data;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400903 dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500904 gfs2_dirent_last, &args, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500905 if (!dent) {
906 brelse(bh);
907 brelse(dibh);
908 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000909 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500910 if (IS_ERR(dent)) {
911 brelse(bh);
912 brelse(dibh);
913 return PTR_ERR(dent);
914 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000915
916 /* Adjust the last dirent's record length
917 (Remember that dent still points to the last entry.) */
918
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000919 dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) +
David Teiglandb3b94fa2006-01-16 16:50:04 +0000920 sizeof(struct gfs2_dinode) -
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000921 sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000922
923 brelse(bh);
924
925 /* We're done with the new leaf block, now setup the new
926 hash table. */
927
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000928 gfs2_trans_add_meta(dip->i_gl, dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000929 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
930
Al Virob44b84d2006-10-14 10:46:30 -0400931 lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000932
933 for (x = sdp->sd_hash_ptrs; x--; lp++)
934 *lp = cpu_to_be64(bn);
935
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100936 i_size_write(inode, sdp->sd_sb.sb_bsize / 2);
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000937 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000938 dip->i_diskflags |= GFS2_DIF_EXHASH;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000939
940 for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000941 dip->i_depth = y;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000942
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500943 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000944
945 brelse(dibh);
946
947 return 0;
948}
949
950/**
951 * dir_split_leaf - Split a leaf block into two
952 * @dip: The GFS2 inode
953 * @index:
954 * @leaf_no:
955 *
956 * Returns: 0 on success, error code on failure
957 */
958
Steven Whitehousec7526662006-03-20 12:30:04 -0500959static int dir_split_leaf(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000960{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400961 struct gfs2_inode *dip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000962 struct buffer_head *nbh, *obh, *dibh;
963 struct gfs2_leaf *nleaf, *oleaf;
Steven Whitehouse4da3c642006-07-11 13:19:13 -0400964 struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new;
Steven Whitehousecd915492006-09-04 12:49:07 -0400965 u32 start, len, half_len, divider;
Al Virob44b84d2006-10-14 10:46:30 -0400966 u64 bn, leaf_no;
967 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -0400968 u32 index;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000969 int x, moved = 0;
970 int error;
971
Steven Whitehouse9a004502008-02-01 09:23:44 +0000972 index = name->hash >> (32 - dip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500973 error = get_leaf_nr(dip, index, &leaf_no);
974 if (error)
975 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000976
977 /* Get the old leaf block */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000978 error = get_leaf(dip, leaf_no, &obh);
979 if (error)
Steven Whitehousee90deff2006-03-29 19:02:15 -0500980 return error;
981
982 oleaf = (struct gfs2_leaf *)obh->b_data;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000983 if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) {
Steven Whitehousee90deff2006-03-29 19:02:15 -0500984 brelse(obh);
985 return 1; /* can't split */
986 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000987
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000988 gfs2_trans_add_meta(dip->i_gl, obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000989
Steven Whitehousec7526662006-03-20 12:30:04 -0500990 nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1);
991 if (!nleaf) {
992 brelse(obh);
993 return -ENOSPC;
994 }
995 bn = nbh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000996
Steven Whitehousec7526662006-03-20 12:30:04 -0500997 /* Compute the start and len of leaf pointers in the hash table. */
Steven Whitehouse9a004502008-02-01 09:23:44 +0000998 len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000999 half_len = len >> 1;
1000 if (!half_len) {
Joe Perchesd77d1b52014-03-06 12:10:45 -08001001 pr_warn("i_depth %u lf_depth %u index %u\n",
1002 dip->i_depth, be16_to_cpu(oleaf->lf_depth), index);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001003 gfs2_consist_inode(dip);
1004 error = -EIO;
1005 goto fail_brelse;
1006 }
1007
1008 start = (index & ~(len - 1));
1009
1010 /* Change the pointers.
1011 Don't bother distinguishing stuffed from non-stuffed.
1012 This code is complicated enough already. */
David Rientjes4244b522010-07-20 19:45:03 -07001013 lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS);
1014 if (!lp) {
1015 error = -ENOMEM;
1016 goto fail_brelse;
1017 }
1018
David Teiglandb3b94fa2006-01-16 16:50:04 +00001019 /* Change the pointers */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001020 for (x = 0; x < half_len; x++)
1021 lp[x] = cpu_to_be64(bn);
1022
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001023 gfs2_dir_hash_inval(dip);
1024
Steven Whitehousecd915492006-09-04 12:49:07 -04001025 error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64),
1026 half_len * sizeof(u64));
1027 if (error != half_len * sizeof(u64)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001028 if (error >= 0)
1029 error = -EIO;
1030 goto fail_lpfree;
1031 }
1032
1033 kfree(lp);
1034
1035 /* Compute the divider */
Steven Whitehouse9a004502008-02-01 09:23:44 +00001036 divider = (start + half_len) << (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001037
1038 /* Copy the entries */
Steven Whitehouse15793432009-11-06 11:06:37 +00001039 dent = (struct gfs2_dirent *)(obh->b_data + sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001040
1041 do {
1042 next = dent;
1043 if (dirent_next(dip, obh, &next))
1044 next = NULL;
1045
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -05001046 if (!gfs2_dirent_sentinel(dent) &&
David Teiglandb3b94fa2006-01-16 16:50:04 +00001047 be32_to_cpu(dent->de_hash) < divider) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001048 struct qstr str;
1049 str.name = (char*)(dent+1);
1050 str.len = be16_to_cpu(dent->de_name_len);
1051 str.hash = be32_to_cpu(dent->de_hash);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001052 new = gfs2_dirent_alloc(inode, nbh, &str);
Steven Whitehousec7526662006-03-20 12:30:04 -05001053 if (IS_ERR(new)) {
1054 error = PTR_ERR(new);
1055 break;
1056 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001057
1058 new->de_inum = dent->de_inum; /* No endian worries */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001059 new->de_type = dent->de_type; /* No endian worries */
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001060 be16_add_cpu(&nleaf->lf_entries, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001061
1062 dirent_del(dip, obh, prev, dent);
1063
1064 if (!oleaf->lf_entries)
1065 gfs2_consist_inode(dip);
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001066 be16_add_cpu(&oleaf->lf_entries, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001067
1068 if (!prev)
1069 prev = dent;
1070
1071 moved = 1;
Steven Whitehousec7526662006-03-20 12:30:04 -05001072 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001073 prev = dent;
Steven Whitehousec7526662006-03-20 12:30:04 -05001074 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001075 dent = next;
Steven Whitehousec7526662006-03-20 12:30:04 -05001076 } while (dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077
Steven Whitehousec7526662006-03-20 12:30:04 -05001078 oleaf->lf_depth = nleaf->lf_depth;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001079
1080 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001081 if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) {
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001082 gfs2_trans_add_meta(dip->i_gl, dibh);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001083 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001084 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001085 brelse(dibh);
1086 }
1087
1088 brelse(obh);
1089 brelse(nbh);
1090
1091 return error;
1092
Steven Whitehousee90deff2006-03-29 19:02:15 -05001093fail_lpfree:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001094 kfree(lp);
1095
Steven Whitehousee90deff2006-03-29 19:02:15 -05001096fail_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001097 brelse(obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001098 brelse(nbh);
1099 return error;
1100}
1101
1102/**
1103 * dir_double_exhash - Double size of ExHash table
1104 * @dip: The GFS2 dinode
1105 *
1106 * Returns: 0 on success, error code on failure
1107 */
1108
1109static int dir_double_exhash(struct gfs2_inode *dip)
1110{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001111 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001112 u32 hsize;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001113 u32 hsize_bytes;
1114 __be64 *hc;
1115 __be64 *hc2, *h;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001116 int x;
1117 int error = 0;
1118
Steven Whitehouse9a004502008-02-01 09:23:44 +00001119 hsize = 1 << dip->i_depth;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001120 hsize_bytes = hsize * sizeof(__be64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001121
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001122 hc = gfs2_dir_get_hash_table(dip);
1123 if (IS_ERR(hc))
1124 return PTR_ERR(hc);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001125
Bob Peterson512cbf02013-06-14 08:39:18 -04001126 hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS | __GFP_NOWARN);
Bob Petersone8830d82013-05-30 09:48:56 -04001127 if (hc2 == NULL)
1128 hc2 = __vmalloc(hsize_bytes * 2, GFP_NOFS, PAGE_KERNEL);
1129
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001130 if (!hc2)
David Rientjes4244b522010-07-20 19:45:03 -07001131 return -ENOMEM;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001132
Bob Peterson512cbf02013-06-14 08:39:18 -04001133 h = hc2;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001134 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001135 if (error)
1136 goto out_kfree;
1137
1138 for (x = 0; x < hsize; x++) {
1139 *h++ = *hc;
1140 *h++ = *hc;
1141 hc++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001142 }
1143
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001144 error = gfs2_dir_write_data(dip, (char *)hc2, 0, hsize_bytes * 2);
1145 if (error != (hsize_bytes * 2))
1146 goto fail;
1147
1148 gfs2_dir_hash_inval(dip);
1149 dip->i_hash_cache = hc2;
1150 dip->i_depth++;
1151 gfs2_dinode_out(dip, dibh->b_data);
1152 brelse(dibh);
1153 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001154
Steven Whitehousea91ea692006-09-04 12:04:26 -04001155fail:
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001156 /* Replace original hash table & size */
1157 gfs2_dir_write_data(dip, (char *)hc, 0, hsize_bytes);
1158 i_size_write(&dip->i_inode, hsize_bytes);
1159 gfs2_dinode_out(dip, dibh->b_data);
1160 brelse(dibh);
1161out_kfree:
Al Viro3cdcf632014-11-20 05:18:38 +00001162 kvfree(hc2);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001163 return error;
1164}
1165
1166/**
1167 * compare_dents - compare directory entries by hash value
1168 * @a: first dent
1169 * @b: second dent
1170 *
1171 * When comparing the hash entries of @a to @b:
1172 * gt: returns 1
1173 * lt: returns -1
1174 * eq: returns 0
1175 */
1176
1177static int compare_dents(const void *a, const void *b)
1178{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001179 const struct gfs2_dirent *dent_a, *dent_b;
Steven Whitehousecd915492006-09-04 12:49:07 -04001180 u32 hash_a, hash_b;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001181 int ret = 0;
1182
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001183 dent_a = *(const struct gfs2_dirent **)a;
Steven Whitehousec7526662006-03-20 12:30:04 -05001184 hash_a = be32_to_cpu(dent_a->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001185
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001186 dent_b = *(const struct gfs2_dirent **)b;
Steven Whitehousec7526662006-03-20 12:30:04 -05001187 hash_b = be32_to_cpu(dent_b->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001188
1189 if (hash_a > hash_b)
1190 ret = 1;
1191 else if (hash_a < hash_b)
1192 ret = -1;
1193 else {
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001194 unsigned int len_a = be16_to_cpu(dent_a->de_name_len);
1195 unsigned int len_b = be16_to_cpu(dent_b->de_name_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001196
1197 if (len_a > len_b)
1198 ret = 1;
1199 else if (len_a < len_b)
1200 ret = -1;
1201 else
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001202 ret = memcmp(dent_a + 1, dent_b + 1, len_a);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001203 }
1204
1205 return ret;
1206}
1207
1208/**
1209 * do_filldir_main - read out directory entries
1210 * @dip: The GFS2 inode
Al Virod81a8ef2013-05-16 14:14:48 -04001211 * @ctx: what to feed the entries to
David Teiglandb3b94fa2006-01-16 16:50:04 +00001212 * @darr: an array of struct gfs2_dirent pointers to read
1213 * @entries: the number of entries in darr
1214 * @copied: pointer to int that's non-zero if a entry has been copied out
1215 *
1216 * Jump through some hoops to make sure that if there are hash collsions,
1217 * they are read out at the beginning of a buffer. We want to minimize
1218 * the possibility that they will fall into different readdir buffers or
1219 * that someone will want to seek to that location.
1220 *
Al Virod81a8ef2013-05-16 14:14:48 -04001221 * Returns: errno, >0 if the actor tells you to stop
David Teiglandb3b94fa2006-01-16 16:50:04 +00001222 */
1223
Al Virod81a8ef2013-05-16 14:14:48 -04001224static int do_filldir_main(struct gfs2_inode *dip, struct dir_context *ctx,
Steven Whitehousecd915492006-09-04 12:49:07 -04001225 const struct gfs2_dirent **darr, u32 entries,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001226 int *copied)
1227{
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001228 const struct gfs2_dirent *dent, *dent_next;
Steven Whitehousecd915492006-09-04 12:49:07 -04001229 u64 off, off_next;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001230 unsigned int x, y;
1231 int run = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001232
1233 sort(darr, entries, sizeof(struct gfs2_dirent *), compare_dents, NULL);
1234
1235 dent_next = darr[0];
1236 off_next = be32_to_cpu(dent_next->de_hash);
1237 off_next = gfs2_disk_hash2offset(off_next);
1238
1239 for (x = 0, y = 1; x < entries; x++, y++) {
1240 dent = dent_next;
1241 off = off_next;
1242
1243 if (y < entries) {
1244 dent_next = darr[y];
1245 off_next = be32_to_cpu(dent_next->de_hash);
1246 off_next = gfs2_disk_hash2offset(off_next);
1247
Al Virod81a8ef2013-05-16 14:14:48 -04001248 if (off < ctx->pos)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001249 continue;
Al Virod81a8ef2013-05-16 14:14:48 -04001250 ctx->pos = off;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001251
1252 if (off_next == off) {
1253 if (*copied && !run)
1254 return 1;
1255 run = 1;
1256 } else
1257 run = 0;
1258 } else {
Al Virod81a8ef2013-05-16 14:14:48 -04001259 if (off < ctx->pos)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001260 continue;
Al Virod81a8ef2013-05-16 14:14:48 -04001261 ctx->pos = off;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001262 }
1263
Al Virod81a8ef2013-05-16 14:14:48 -04001264 if (!dir_emit(ctx, (const char *)(dent + 1),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001265 be16_to_cpu(dent->de_name_len),
Al Virod81a8ef2013-05-16 14:14:48 -04001266 be64_to_cpu(dent->de_inum.no_addr),
1267 be16_to_cpu(dent->de_type)))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001268 return 1;
1269
1270 *copied = 1;
1271 }
1272
Al Virod81a8ef2013-05-16 14:14:48 -04001273 /* Increment the ctx->pos by one, so the next time we come into the
David Teiglandb3b94fa2006-01-16 16:50:04 +00001274 do_filldir fxn, we get the next entry instead of the last one in the
1275 current leaf */
1276
Al Virod81a8ef2013-05-16 14:14:48 -04001277 ctx->pos++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001278
1279 return 0;
1280}
1281
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001282static void *gfs2_alloc_sort_buffer(unsigned size)
1283{
1284 void *ptr = NULL;
1285
1286 if (size < KMALLOC_MAX_SIZE)
1287 ptr = kmalloc(size, GFP_NOFS | __GFP_NOWARN);
1288 if (!ptr)
1289 ptr = __vmalloc(size, GFP_NOFS, PAGE_KERNEL);
1290 return ptr;
1291}
1292
Al Virod81a8ef2013-05-16 14:14:48 -04001293static int gfs2_dir_read_leaf(struct inode *inode, struct dir_context *ctx,
1294 int *copied, unsigned *depth,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001295 u64 leaf_no)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001296{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001297 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001298 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001299 struct buffer_head *bh;
1300 struct gfs2_leaf *lf;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001301 unsigned entries = 0, entries2 = 0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001302 unsigned leaves = 0;
1303 const struct gfs2_dirent **darr, *dent;
1304 struct dirent_gather g;
1305 struct buffer_head **larr;
1306 int leaf = 0;
1307 int error, i;
1308 u64 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001309
David Teiglandb3b94fa2006-01-16 16:50:04 +00001310 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001311 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001312 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001313 goto out;
1314 lf = (struct gfs2_leaf *)bh->b_data;
1315 if (leaves == 0)
1316 *depth = be16_to_cpu(lf->lf_depth);
1317 entries += be16_to_cpu(lf->lf_entries);
1318 leaves++;
1319 lfn = be64_to_cpu(lf->lf_next);
1320 brelse(bh);
1321 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001322
1323 if (!entries)
1324 return 0;
1325
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001326 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001327 /*
1328 * The extra 99 entries are not normally used, but are a buffer
1329 * zone in case the number of entries in the leaf is corrupt.
1330 * 99 is the maximum number of entries that can fit in a single
1331 * leaf block.
1332 */
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001333 larr = gfs2_alloc_sort_buffer((leaves + entries + 99) * sizeof(void *));
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001334 if (!larr)
1335 goto out;
1336 darr = (const struct gfs2_dirent **)(larr + leaves);
1337 g.pdent = darr;
1338 g.offset = 0;
1339 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001340
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001341 do {
1342 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001343 if (error)
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001344 goto out_free;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001345 lf = (struct gfs2_leaf *)bh->b_data;
1346 lfn = be64_to_cpu(lf->lf_next);
1347 if (lf->lf_entries) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001348 entries2 += be16_to_cpu(lf->lf_entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001349 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
1350 gfs2_dirent_gather, NULL, &g);
1351 error = PTR_ERR(dent);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001352 if (IS_ERR(dent))
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001353 goto out_free;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001354 if (entries2 != g.offset) {
akpm@linux-foundation.orgf391a4e2007-04-25 21:08:02 -07001355 fs_warn(sdp, "Number of entries corrupt in dir "
1356 "leaf %llu, entries2 (%u) != "
1357 "g.offset (%u)\n",
1358 (unsigned long long)bh->b_blocknr,
1359 entries2, g.offset);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001360
1361 error = -EIO;
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001362 goto out_free;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001363 }
1364 error = 0;
1365 larr[leaf++] = bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001366 } else {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001367 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001368 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001369 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001370
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001371 BUG_ON(entries2 != entries);
Al Virod81a8ef2013-05-16 14:14:48 -04001372 error = do_filldir_main(ip, ctx, darr, entries, copied);
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001373out_free:
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001374 for(i = 0; i < leaf; i++)
1375 brelse(larr[i]);
Al Viro3cdcf632014-11-20 05:18:38 +00001376 kvfree(larr);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001377out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001378 return error;
1379}
1380
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001381/**
1382 * gfs2_dir_readahead - Issue read-ahead requests for leaf blocks.
Bob Petersondfe4d342011-10-27 12:16:06 -04001383 *
1384 * Note: we can't calculate each index like dir_e_read can because we don't
1385 * have the leaf, and therefore we don't have the depth, and therefore we
1386 * don't have the length. So we have to just read enough ahead to make up
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001387 * for the loss of information.
1388 */
Bob Petersondfe4d342011-10-27 12:16:06 -04001389static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index,
1390 struct file_ra_state *f_ra)
1391{
1392 struct gfs2_inode *ip = GFS2_I(inode);
1393 struct gfs2_glock *gl = ip->i_gl;
1394 struct buffer_head *bh;
1395 u64 blocknr = 0, last;
1396 unsigned count;
1397
1398 /* First check if we've already read-ahead for the whole range. */
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001399 if (index + MAX_RA_BLOCKS < f_ra->start)
Bob Petersondfe4d342011-10-27 12:16:06 -04001400 return;
1401
1402 f_ra->start = max((pgoff_t)index, f_ra->start);
1403 for (count = 0; count < MAX_RA_BLOCKS; count++) {
1404 if (f_ra->start >= hsize) /* if exceeded the hash table */
1405 break;
1406
1407 last = blocknr;
1408 blocknr = be64_to_cpu(ip->i_hash_cache[f_ra->start]);
1409 f_ra->start++;
1410 if (blocknr == last)
1411 continue;
1412
1413 bh = gfs2_getbuf(gl, blocknr, 1);
1414 if (trylock_buffer(bh)) {
1415 if (buffer_uptodate(bh)) {
1416 unlock_buffer(bh);
1417 brelse(bh);
1418 continue;
1419 }
1420 bh->b_end_io = end_buffer_read_sync;
1421 submit_bh(READA | REQ_META, bh);
1422 continue;
1423 }
1424 brelse(bh);
1425 }
1426}
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001427
David Teiglandb3b94fa2006-01-16 16:50:04 +00001428/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001429 * dir_e_read - Reads the entries from a directory into a filldir buffer
1430 * @dip: dinode pointer
Al Virod81a8ef2013-05-16 14:14:48 -04001431 * @ctx: actor to feed the entries to
David Teiglandb3b94fa2006-01-16 16:50:04 +00001432 *
1433 * Returns: errno
1434 */
1435
Al Virod81a8ef2013-05-16 14:14:48 -04001436static int dir_e_read(struct inode *inode, struct dir_context *ctx,
1437 struct file_ra_state *f_ra)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001438{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001439 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousecd915492006-09-04 12:49:07 -04001440 u32 hsize, len = 0;
Steven Whitehousecd915492006-09-04 12:49:07 -04001441 u32 hash, index;
Al Virob44b84d2006-10-14 10:46:30 -04001442 __be64 *lp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001443 int copied = 0;
1444 int error = 0;
Steven Whitehouse4da3c642006-07-11 13:19:13 -04001445 unsigned depth = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001446
Steven Whitehouse9a004502008-02-01 09:23:44 +00001447 hsize = 1 << dip->i_depth;
Al Virod81a8ef2013-05-16 14:14:48 -04001448 hash = gfs2_dir_offset2hash(ctx->pos);
Steven Whitehouse9a004502008-02-01 09:23:44 +00001449 index = hash >> (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001450
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001451 if (dip->i_hash_cache == NULL)
Bob Petersondfe4d342011-10-27 12:16:06 -04001452 f_ra->start = 0;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001453 lp = gfs2_dir_get_hash_table(dip);
1454 if (IS_ERR(lp))
1455 return PTR_ERR(lp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001456
Bob Petersondfe4d342011-10-27 12:16:06 -04001457 gfs2_dir_readahead(inode, hsize, index, f_ra);
1458
David Teiglandb3b94fa2006-01-16 16:50:04 +00001459 while (index < hsize) {
Al Virod81a8ef2013-05-16 14:14:48 -04001460 error = gfs2_dir_read_leaf(inode, ctx,
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001461 &copied, &depth,
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001462 be64_to_cpu(lp[index]));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001463 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001464 break;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001465
Steven Whitehouse9a004502008-02-01 09:23:44 +00001466 len = 1 << (dip->i_depth - depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001467 index = (index & ~(len - 1)) + len;
1468 }
1469
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001470 if (error > 0)
1471 error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001472 return error;
1473}
1474
Al Virod81a8ef2013-05-16 14:14:48 -04001475int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
1476 struct file_ra_state *f_ra)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001477{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001478 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001479 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001480 struct dirent_gather g;
1481 const struct gfs2_dirent **darr, *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001482 struct buffer_head *dibh;
1483 int copied = 0;
1484 int error;
1485
Steven Whitehousead6203f2008-11-03 13:59:19 +00001486 if (!dip->i_entries)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001487 return 0;
1488
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001489 if (dip->i_diskflags & GFS2_DIF_EXHASH)
Al Virod81a8ef2013-05-16 14:14:48 -04001490 return dir_e_read(inode, ctx, f_ra);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001491
David Teiglandb3b94fa2006-01-16 16:50:04 +00001492 if (!gfs2_is_stuffed(dip)) {
1493 gfs2_consist_inode(dip);
1494 return -EIO;
1495 }
1496
David Teiglandb3b94fa2006-01-16 16:50:04 +00001497 error = gfs2_meta_inode_buffer(dip, &dibh);
1498 if (error)
1499 return error;
1500
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001501 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001502 /* 96 is max number of dirents which can be stuffed into an inode */
Josef Bacik16c5f062008-04-09 09:33:41 -04001503 darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_NOFS);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001504 if (darr) {
1505 g.pdent = darr;
1506 g.offset = 0;
1507 dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size,
1508 gfs2_dirent_gather, NULL, &g);
1509 if (IS_ERR(dent)) {
1510 error = PTR_ERR(dent);
1511 goto out;
1512 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001513 if (dip->i_entries != g.offset) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001514 fs_warn(sdp, "Number of entries corrupt in dir %llu, "
Steven Whitehousead6203f2008-11-03 13:59:19 +00001515 "ip->i_entries (%u) != g.offset (%u)\n",
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001516 (unsigned long long)dip->i_no_addr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001517 dip->i_entries,
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001518 g.offset);
1519 error = -EIO;
1520 goto out;
1521 }
Al Virod81a8ef2013-05-16 14:14:48 -04001522 error = do_filldir_main(dip, ctx, darr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001523 dip->i_entries, &copied);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001524out:
1525 kfree(darr);
1526 }
1527
David Teiglandb3b94fa2006-01-16 16:50:04 +00001528 if (error > 0)
1529 error = 0;
1530
1531 brelse(dibh);
1532
1533 return error;
1534}
1535
David Teiglandb3b94fa2006-01-16 16:50:04 +00001536/**
1537 * gfs2_dir_search - Search a directory
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001538 * @dip: The GFS2 dir inode
1539 * @name: The name we are looking up
1540 * @fail_on_exist: Fail if the name exists rather than looking it up
David Teiglandb3b94fa2006-01-16 16:50:04 +00001541 *
1542 * This routine searches a directory for a file or another directory.
1543 * Assumes a glock is held on dip.
1544 *
1545 * Returns: errno
1546 */
1547
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001548struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name,
1549 bool fail_on_exist)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001550{
Steven Whitehousec7526662006-03-20 12:30:04 -05001551 struct buffer_head *bh;
1552 struct gfs2_dirent *dent;
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001553 u64 addr, formal_ino;
1554 u16 dtype;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001555
1556 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1557 if (dent) {
1558 if (IS_ERR(dent))
David Howellse231c2e2008-02-07 00:15:26 -08001559 return ERR_CAST(dent);
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001560 dtype = be16_to_cpu(dent->de_type);
1561 addr = be64_to_cpu(dent->de_inum.no_addr);
1562 formal_ino = be64_to_cpu(dent->de_inum.no_formal_ino);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001563 brelse(bh);
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001564 if (fail_on_exist)
1565 return ERR_PTR(-EEXIST);
1566 return gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino, 0);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001567 }
1568 return ERR_PTR(-ENOENT);
1569}
1570
1571int gfs2_dir_check(struct inode *dir, const struct qstr *name,
1572 const struct gfs2_inode *ip)
1573{
1574 struct buffer_head *bh;
1575 struct gfs2_dirent *dent;
1576 int ret = -ENOENT;
Steven Whitehousec7526662006-03-20 12:30:04 -05001577
1578 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1579 if (dent) {
1580 if (IS_ERR(dent))
1581 return PTR_ERR(dent);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001582 if (ip) {
1583 if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr)
1584 goto out;
1585 if (be64_to_cpu(dent->de_inum.no_formal_ino) !=
1586 ip->i_no_formal_ino)
1587 goto out;
1588 if (unlikely(IF2DT(ip->i_inode.i_mode) !=
1589 be16_to_cpu(dent->de_type))) {
1590 gfs2_consist_inode(GFS2_I(dir));
1591 ret = -EIO;
1592 goto out;
1593 }
1594 }
1595 ret = 0;
1596out:
Steven Whitehousec7526662006-03-20 12:30:04 -05001597 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001598 }
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001599 return ret;
Steven Whitehousec7526662006-03-20 12:30:04 -05001600}
1601
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001602/**
1603 * dir_new_leaf - Add a new leaf onto hash chain
1604 * @inode: The directory
1605 * @name: The name we are adding
1606 *
1607 * This adds a new dir leaf onto an existing leaf when there is not
1608 * enough space to add a new dir entry. This is a last resort after
1609 * we've expanded the hash table to max size and also split existing
1610 * leaf blocks, so it will only occur for very large directories.
1611 *
1612 * The dist parameter is set to 1 for leaf blocks directly attached
1613 * to the hash table, 2 for one layer of indirection, 3 for two layers
1614 * etc. We are thus able to tell the difference between an old leaf
1615 * with dist set to zero (i.e. "don't know") and a new one where we
1616 * set this information for debug/fsck purposes.
1617 *
1618 * Returns: 0 on success, or -ve on error
1619 */
1620
Steven Whitehousec7526662006-03-20 12:30:04 -05001621static int dir_new_leaf(struct inode *inode, const struct qstr *name)
1622{
1623 struct buffer_head *bh, *obh;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001624 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001625 struct gfs2_leaf *leaf, *oleaf;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001626 u32 dist = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001627 int error;
Steven Whitehousec7526662006-03-20 12:30:04 -05001628 u32 index;
1629 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001630
Steven Whitehouse9a004502008-02-01 09:23:44 +00001631 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -05001632 error = get_first_leaf(ip, index, &obh);
1633 if (error)
1634 return error;
1635 do {
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001636 dist++;
Steven Whitehousec7526662006-03-20 12:30:04 -05001637 oleaf = (struct gfs2_leaf *)obh->b_data;
1638 bn = be64_to_cpu(oleaf->lf_next);
1639 if (!bn)
1640 break;
1641 brelse(obh);
1642 error = get_leaf(ip, bn, &obh);
1643 if (error)
1644 return error;
1645 } while(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001646
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001647 gfs2_trans_add_meta(ip->i_gl, obh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001648
1649 leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth));
1650 if (!leaf) {
1651 brelse(obh);
1652 return -ENOSPC;
1653 }
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001654 leaf->lf_dist = cpu_to_be32(dist);
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001655 oleaf->lf_next = cpu_to_be64(bh->b_blocknr);
Steven Whitehousec7526662006-03-20 12:30:04 -05001656 brelse(bh);
1657 brelse(obh);
1658
1659 error = gfs2_meta_inode_buffer(ip, &bh);
1660 if (error)
1661 return error;
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001662 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001663 gfs2_add_inode_blocks(&ip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001664 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001665 brelse(bh);
1666 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001667}
1668
Steven Whitehouse44aaada2014-02-07 11:23:22 +00001669static u16 gfs2_inode_ra_len(const struct gfs2_inode *ip)
1670{
1671 u64 where = ip->i_no_addr + 1;
1672 if (ip->i_eattr == where)
1673 return 1;
1674 return 0;
1675}
1676
David Teiglandb3b94fa2006-01-16 16:50:04 +00001677/**
1678 * gfs2_dir_add - Add new filename into directory
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001679 * @inode: The directory inode
1680 * @name: The new name
1681 * @nip: The GFS2 inode to be linked in to the directory
1682 * @da: The directory addition info
1683 *
1684 * If the call to gfs2_diradd_alloc_required resulted in there being
1685 * no need to allocate any new directory blocks, then it will contain
1686 * a pointer to the directory entry and the bh in which it resides. We
1687 * can use that without having to repeat the search. If there was no
1688 * free space, then we must now create more space.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001689 *
1690 * Returns: 0 on success, error code on failure
1691 */
1692
Steven Whitehousec7526662006-03-20 12:30:04 -05001693int gfs2_dir_add(struct inode *inode, const struct qstr *name,
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001694 const struct gfs2_inode *nip, struct gfs2_diradd *da)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001695{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001696 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001697 struct buffer_head *bh = da->bh;
1698 struct gfs2_dirent *dent = da->dent;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001699 struct timespec tv;
Steven Whitehousec7526662006-03-20 12:30:04 -05001700 struct gfs2_leaf *leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001701 int error;
1702
Steven Whitehousec7526662006-03-20 12:30:04 -05001703 while(1) {
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001704 if (da->bh == NULL) {
1705 dent = gfs2_dirent_search(inode, name,
1706 gfs2_dirent_find_space, &bh);
1707 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001708 if (dent) {
1709 if (IS_ERR(dent))
1710 return PTR_ERR(dent);
1711 dent = gfs2_init_dirent(inode, dent, name, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001712 gfs2_inum_out(nip, dent);
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001713 dent->de_type = cpu_to_be16(IF2DT(nip->i_inode.i_mode));
Steven Whitehouse44aaada2014-02-07 11:23:22 +00001714 dent->de_rahead = cpu_to_be16(gfs2_inode_ra_len(nip));
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001715 tv = CURRENT_TIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001716 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001717 leaf = (struct gfs2_leaf *)bh->b_data;
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001718 be16_add_cpu(&leaf->lf_entries, 1);
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001719 leaf->lf_nsec = cpu_to_be32(tv.tv_nsec);
1720 leaf->lf_sec = cpu_to_be64(tv.tv_sec);
Steven Whitehousec7526662006-03-20 12:30:04 -05001721 }
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001722 da->dent = NULL;
1723 da->bh = NULL;
Steven Whitehousec7526662006-03-20 12:30:04 -05001724 brelse(bh);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001725 ip->i_entries++;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001726 ip->i_inode.i_mtime = ip->i_inode.i_ctime = tv;
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001727 if (S_ISDIR(nip->i_inode.i_mode))
1728 inc_nlink(&ip->i_inode);
Bob Peterson343cd8f2012-11-12 13:04:54 -05001729 mark_inode_dirty(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001730 error = 0;
1731 break;
1732 }
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001733 if (!(ip->i_diskflags & GFS2_DIF_EXHASH)) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001734 error = dir_make_exhash(inode);
1735 if (error)
1736 break;
1737 continue;
1738 }
1739 error = dir_split_leaf(inode, name);
1740 if (error == 0)
1741 continue;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001742 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001743 break;
Steven Whitehouse9a004502008-02-01 09:23:44 +00001744 if (ip->i_depth < GFS2_DIR_MAX_DEPTH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001745 error = dir_double_exhash(ip);
1746 if (error)
1747 break;
1748 error = dir_split_leaf(inode, name);
Steven Whitehousee90deff2006-03-29 19:02:15 -05001749 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001750 break;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001751 if (error == 0)
1752 continue;
Steven Whitehousec7526662006-03-20 12:30:04 -05001753 }
1754 error = dir_new_leaf(inode, name);
1755 if (!error)
1756 continue;
1757 error = -ENOSPC;
1758 break;
1759 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001760 return error;
1761}
1762
Steven Whitehousec7526662006-03-20 12:30:04 -05001763
David Teiglandb3b94fa2006-01-16 16:50:04 +00001764/**
1765 * gfs2_dir_del - Delete a directory entry
1766 * @dip: The GFS2 inode
1767 * @filename: The filename
1768 *
1769 * Returns: 0 on success, error code on failure
1770 */
1771
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001772int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001773{
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001774 const struct qstr *name = &dentry->d_name;
Steven Whitehousec7526662006-03-20 12:30:04 -05001775 struct gfs2_dirent *dent, *prev = NULL;
1776 struct buffer_head *bh;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001777 struct timespec tv = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001778
Steven Whitehousec7526662006-03-20 12:30:04 -05001779 /* Returns _either_ the entry (if its first in block) or the
1780 previous entry otherwise */
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001781 dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001782 if (!dent) {
1783 gfs2_consist_inode(dip);
1784 return -EIO;
1785 }
1786 if (IS_ERR(dent)) {
1787 gfs2_consist_inode(dip);
1788 return PTR_ERR(dent);
1789 }
1790 /* If not first in block, adjust pointers accordingly */
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001791 if (gfs2_dirent_find(dent, name, NULL) == 0) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001792 prev = dent;
1793 dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len));
1794 }
1795
1796 dirent_del(dip, bh, prev, dent);
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001797 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001798 struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
1799 u16 entries = be16_to_cpu(leaf->lf_entries);
1800 if (!entries)
1801 gfs2_consist_inode(dip);
1802 leaf->lf_entries = cpu_to_be16(--entries);
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001803 leaf->lf_nsec = cpu_to_be32(tv.tv_nsec);
1804 leaf->lf_sec = cpu_to_be64(tv.tv_sec);
Steven Whitehousec7526662006-03-20 12:30:04 -05001805 }
Steven Whitehouseed386502006-04-07 16:28:07 -04001806 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001807
Steven Whitehousead6203f2008-11-03 13:59:19 +00001808 if (!dip->i_entries)
Steven Whitehousec7526662006-03-20 12:30:04 -05001809 gfs2_consist_inode(dip);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001810 dip->i_entries--;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001811 dip->i_inode.i_mtime = dip->i_inode.i_ctime = tv;
David Howellse36cb0b2015-01-29 12:02:35 +00001812 if (d_is_dir(dentry))
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001813 drop_nlink(&dip->i_inode);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001814 mark_inode_dirty(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001815
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001816 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001817}
1818
David Teiglandb3b94fa2006-01-16 16:50:04 +00001819/**
1820 * gfs2_dir_mvino - Change inode number of directory entry
1821 * @dip: The GFS2 inode
1822 * @filename:
1823 * @new_inode:
1824 *
1825 * This routine changes the inode number of a directory entry. It's used
1826 * by rename to change ".." when a directory is moved.
1827 * Assumes a glock is held on dvp.
1828 *
1829 * Returns: errno
1830 */
1831
Steven Whitehousec7526662006-03-20 12:30:04 -05001832int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001833 const struct gfs2_inode *nip, unsigned int new_type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001834{
Steven Whitehousec7526662006-03-20 12:30:04 -05001835 struct buffer_head *bh;
1836 struct gfs2_dirent *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001837 int error;
1838
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001839 dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001840 if (!dent) {
1841 gfs2_consist_inode(dip);
1842 return -EIO;
1843 }
1844 if (IS_ERR(dent))
1845 return PTR_ERR(dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001846
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001847 gfs2_trans_add_meta(dip->i_gl, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001848 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001849 dent->de_type = cpu_to_be16(new_type);
1850
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001851 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001852 brelse(bh);
1853 error = gfs2_meta_inode_buffer(dip, &bh);
1854 if (error)
1855 return error;
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001856 gfs2_trans_add_meta(dip->i_gl, bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001857 }
1858
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001859 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001860 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001861 brelse(bh);
1862 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001863}
1864
1865/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001866 * leaf_dealloc - Deallocate a directory leaf
1867 * @dip: the directory
1868 * @index: the hash table offset in the directory
1869 * @len: the number of pointers to this leaf
1870 * @leaf_no: the leaf number
Bob Petersonec038c82011-03-22 13:55:23 -04001871 * @leaf_bh: buffer_head for the starting leaf
Bob Petersond24a7a42011-03-22 13:54:03 -04001872 * last_dealloc: 1 if this is the final dealloc for the leaf, else 0
David Teiglandb3b94fa2006-01-16 16:50:04 +00001873 *
1874 * Returns: errno
1875 */
1876
Steven Whitehousecd915492006-09-04 12:49:07 -04001877static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
Bob Petersonec038c82011-03-22 13:55:23 -04001878 u64 leaf_no, struct buffer_head *leaf_bh,
1879 int last_dealloc)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001880{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001881 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001882 struct gfs2_leaf *tmp_leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001883 struct gfs2_rgrp_list rlist;
1884 struct buffer_head *bh, *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001885 u64 blk, nblk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001886 unsigned int rg_blocks = 0, l_blocks = 0;
1887 char *ht;
Steven Whitehousecd915492006-09-04 12:49:07 -04001888 unsigned int x, size = len * sizeof(u64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001889 int error;
1890
Bob Peterson5e2f7d62012-04-04 22:11:16 -04001891 error = gfs2_rindex_update(sdp);
1892 if (error)
1893 return error;
1894
David Teiglandb3b94fa2006-01-16 16:50:04 +00001895 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1896
Joe Perches8be04b92013-06-19 12:15:53 -07001897 ht = kzalloc(size, GFP_NOFS | __GFP_NOWARN);
Bob Petersone8830d82013-05-30 09:48:56 -04001898 if (ht == NULL)
Oleg Drokin7456a372015-02-01 22:59:54 -05001899 ht = __vmalloc(size, GFP_NOFS | __GFP_NOWARN | __GFP_ZERO,
1900 PAGE_KERNEL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001901 if (!ht)
1902 return -ENOMEM;
1903
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001904 error = gfs2_quota_hold(dip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001905 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001906 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001907
David Teiglandb3b94fa2006-01-16 16:50:04 +00001908 /* Count the number of leaves */
Bob Petersonec038c82011-03-22 13:55:23 -04001909 bh = leaf_bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001910
Steven Whitehousec7526662006-03-20 12:30:04 -05001911 for (blk = leaf_no; blk; blk = nblk) {
Bob Petersonec038c82011-03-22 13:55:23 -04001912 if (blk != leaf_no) {
1913 error = get_leaf(dip, blk, &bh);
1914 if (error)
1915 goto out_rlist;
1916 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001917 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1918 nblk = be64_to_cpu(tmp_leaf->lf_next);
Bob Petersonec038c82011-03-22 13:55:23 -04001919 if (blk != leaf_no)
1920 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001921
Steven Whitehouse70b0c362011-09-02 16:08:09 +01001922 gfs2_rlist_add(dip, &rlist, blk);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001923 l_blocks++;
1924 }
1925
Bob Petersonfe6c9912008-01-28 11:13:02 -06001926 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001927
1928 for (x = 0; x < rlist.rl_rgrps; x++) {
1929 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001930 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001931 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001932 }
1933
1934 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1935 if (error)
1936 goto out_rlist;
1937
1938 error = gfs2_trans_begin(sdp,
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001939 rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) +
David Teiglandb3b94fa2006-01-16 16:50:04 +00001940 RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks);
1941 if (error)
1942 goto out_rg_gunlock;
1943
Bob Petersonec038c82011-03-22 13:55:23 -04001944 bh = leaf_bh;
1945
Steven Whitehousec7526662006-03-20 12:30:04 -05001946 for (blk = leaf_no; blk; blk = nblk) {
Bob Petersonec038c82011-03-22 13:55:23 -04001947 if (blk != leaf_no) {
1948 error = get_leaf(dip, blk, &bh);
1949 if (error)
1950 goto out_end_trans;
1951 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001952 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1953 nblk = be64_to_cpu(tmp_leaf->lf_next);
Bob Petersonec038c82011-03-22 13:55:23 -04001954 if (blk != leaf_no)
1955 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001956
1957 gfs2_free_meta(dip, blk, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001958 gfs2_add_inode_blocks(&dip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001959 }
1960
Steven Whitehousecd915492006-09-04 12:49:07 -04001961 error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001962 if (error != size) {
1963 if (error >= 0)
1964 error = -EIO;
1965 goto out_end_trans;
1966 }
1967
1968 error = gfs2_meta_inode_buffer(dip, &dibh);
1969 if (error)
1970 goto out_end_trans;
1971
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001972 gfs2_trans_add_meta(dip->i_gl, dibh);
Bob Petersond24a7a42011-03-22 13:54:03 -04001973 /* On the last dealloc, make this a regular file in case we crash.
1974 (We don't want to free these blocks a second time.) */
1975 if (last_dealloc)
1976 dip->i_inode.i_mode = S_IFREG;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001977 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001978 brelse(dibh);
1979
Steven Whitehousea91ea692006-09-04 12:04:26 -04001980out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001981 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001982out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001983 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001984out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001985 gfs2_rlist_free(&rlist);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001986 gfs2_quota_unhold(dip);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001987out:
Al Viro3cdcf632014-11-20 05:18:38 +00001988 kvfree(ht);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001989 return error;
1990}
1991
1992/**
1993 * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory
1994 * @dip: the directory
1995 *
1996 * Dealloc all on-disk directory leaves to FREEMETA state
1997 * Change on-disk inode type to "regular file"
1998 *
1999 * Returns: errno
2000 */
2001
2002int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
2003{
Bob Peterson556bb172011-03-22 13:56:37 -04002004 struct buffer_head *bh;
2005 struct gfs2_leaf *leaf;
2006 u32 hsize, len;
Bob Peterson556bb172011-03-22 13:56:37 -04002007 u32 index = 0, next_index;
2008 __be64 *lp;
2009 u64 leaf_no;
2010 int error = 0, last;
2011
2012 hsize = 1 << dip->i_depth;
Bob Peterson556bb172011-03-22 13:56:37 -04002013
Steven Whitehouse17d539f2011-06-15 10:29:37 +01002014 lp = gfs2_dir_get_hash_table(dip);
2015 if (IS_ERR(lp))
2016 return PTR_ERR(lp);
Bob Peterson556bb172011-03-22 13:56:37 -04002017
2018 while (index < hsize) {
Steven Whitehouse17d539f2011-06-15 10:29:37 +01002019 leaf_no = be64_to_cpu(lp[index]);
Bob Peterson556bb172011-03-22 13:56:37 -04002020 if (leaf_no) {
2021 error = get_leaf(dip, leaf_no, &bh);
2022 if (error)
2023 goto out;
2024 leaf = (struct gfs2_leaf *)bh->b_data;
2025 len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
2026
2027 next_index = (index & ~(len - 1)) + len;
2028 last = ((next_index >= hsize) ? 1 : 0);
2029 error = leaf_dealloc(dip, index, len, leaf_no, bh,
2030 last);
2031 brelse(bh);
2032 if (error)
2033 goto out;
2034 index = next_index;
2035 } else
2036 index++;
2037 }
2038
2039 if (index != hsize) {
2040 gfs2_consist_inode(dip);
2041 error = -EIO;
2042 }
2043
2044out:
Bob Peterson556bb172011-03-22 13:56:37 -04002045
2046 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002047}
2048
2049/**
2050 * gfs2_diradd_alloc_required - find if adding entry will require an allocation
2051 * @ip: the file being written to
2052 * @filname: the filename that's going to be added
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002053 * @da: The structure to return dir alloc info
David Teiglandb3b94fa2006-01-16 16:50:04 +00002054 *
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002055 * Returns: 0 if ok, -ve on error
David Teiglandb3b94fa2006-01-16 16:50:04 +00002056 */
2057
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002058int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name,
2059 struct gfs2_diradd *da)
David Teiglandb3b94fa2006-01-16 16:50:04 +00002060{
Steven Whitehouse22b5a6c2014-01-08 11:05:29 +00002061 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002062 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse22b5a6c2014-01-08 11:05:29 +00002063 const unsigned int extra = sizeof(struct gfs2_dinode) - sizeof(struct gfs2_leaf);
Steven Whitehousec7526662006-03-20 12:30:04 -05002064 struct gfs2_dirent *dent;
2065 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002066
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002067 da->nr_blocks = 0;
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00002068 da->bh = NULL;
2069 da->dent = NULL;
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002070
Steven Whitehousec7526662006-03-20 12:30:04 -05002071 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh);
Steven Whitehouseed386502006-04-07 16:28:07 -04002072 if (!dent) {
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002073 da->nr_blocks = sdp->sd_max_dirres;
Steven Whitehouse22b5a6c2014-01-08 11:05:29 +00002074 if (!(ip->i_diskflags & GFS2_DIF_EXHASH) &&
2075 (GFS2_DIRENT_SIZE(name->len) < extra))
2076 da->nr_blocks = 1;
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002077 return 0;
Steven Whitehouseed386502006-04-07 16:28:07 -04002078 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002079 if (IS_ERR(dent))
2080 return PTR_ERR(dent);
Bob Peterson19aeb5a2014-09-29 08:52:04 -04002081
2082 if (da->save_loc) {
2083 da->bh = bh;
2084 da->dent = dent;
2085 } else {
2086 brelse(bh);
2087 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002088 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002089}
2090