blob: 271d93905bac6eed449f6d968324497f22a38301 [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))
Benjamin Marzinski471f3db2015-12-01 08:46:55 -060085#define GFS2_HASH_INDEX_MASK 0xffffc000
86#define GFS2_USE_HASH_FLAG 0x2000
David Teiglandb3b94fa2006-01-16 16:50:04 +000087
Steven Whitehouse8d123582010-09-17 12:30:23 +010088struct qstr gfs2_qdot __read_mostly;
89struct qstr gfs2_qdotdot __read_mostly;
90
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040091typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent,
92 const struct qstr *name, void *opaque);
David Teiglandb3b94fa2006-01-16 16:50:04 +000093
Steven Whitehousecd915492006-09-04 12:49:07 -040094int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -040095 struct buffer_head **bhp)
Steven Whitehousee13940b2006-01-30 13:31:50 +000096{
97 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +000098
Steven Whitehouse61e085a2006-04-24 10:07:13 -040099 bh = gfs2_meta_new(ip->i_gl, block);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000100 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400101 gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD);
102 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
Steven Whitehousee13940b2006-01-30 13:31:50 +0000103 *bhp = bh;
104 return 0;
105}
106
Steven Whitehousecd915492006-09-04 12:49:07 -0400107static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400108 struct buffer_head **bhp)
109{
110 struct buffer_head *bh;
111 int error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000112
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -0600113 error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, 0, &bh);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400114 if (error)
115 return error;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400116 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) {
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400117 brelse(bh);
118 return -EIO;
119 }
120 *bhp = bh;
121 return 0;
122}
Steven Whitehousee13940b2006-01-30 13:31:50 +0000123
124static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf,
125 unsigned int offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000126{
127 struct buffer_head *dibh;
128 int error;
129
130 error = gfs2_meta_inode_buffer(ip, &dibh);
131 if (error)
132 return error;
133
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000134 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500135 memcpy(dibh->b_data + offset + sizeof(struct gfs2_dinode), buf, size);
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100136 if (ip->i_inode.i_size < offset + size)
137 i_size_write(&ip->i_inode, offset + size);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100138 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500139 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000140
141 brelse(dibh);
142
143 return size;
144}
145
146
147
148/**
149 * gfs2_dir_write_data - Write directory information to the inode
150 * @ip: The GFS2 inode
151 * @buf: The buffer containing information to be written
152 * @offset: The file offset to start writing at
153 * @size: The amount of data to write
154 *
155 * Returns: The number of bytes correctly written or error code
156 */
157static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
Steven Whitehousecd915492006-09-04 12:49:07 -0400158 u64 offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000159{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400160 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000161 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400162 u64 lblock, dblock;
163 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000164 unsigned int o;
165 int copied = 0;
166 int error = 0;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000167 int new = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000168
169 if (!size)
170 return 0;
171
172 if (gfs2_is_stuffed(ip) &&
173 offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500174 return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset,
175 size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000176
177 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
178 return -EINVAL;
179
180 if (gfs2_is_stuffed(ip)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400181 error = gfs2_unstuff_dinode(ip, NULL);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000182 if (error)
Steven Whitehousec7526662006-03-20 12:30:04 -0500183 return error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000184 }
185
186 lblock = offset;
187 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
188
189 while (copied < size) {
190 unsigned int amount;
191 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000192
193 amount = size - copied;
194 if (amount > sdp->sd_sb.sb_bsize - o)
195 amount = sdp->sd_sb.sb_bsize - o;
196
197 if (!extlen) {
198 new = 1;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400199 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400200 &dblock, &extlen);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000201 if (error)
202 goto fail;
203 error = -EIO;
204 if (gfs2_assert_withdraw(sdp, dblock))
205 goto fail;
206 }
207
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400208 if (amount == sdp->sd_jbsize || new)
209 error = gfs2_dir_get_new_buffer(ip, dblock, &bh);
210 else
211 error = gfs2_dir_get_existing_buffer(ip, dblock, &bh);
212
Steven Whitehousee13940b2006-01-30 13:31:50 +0000213 if (error)
214 goto fail;
215
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000216 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000217 memcpy(bh->b_data + o, buf, amount);
218 brelse(bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000219
Steven Whitehouse899bb262006-08-01 15:28:57 -0400220 buf += amount;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000221 copied += amount;
222 lblock++;
223 dblock++;
224 extlen--;
225
226 o = sizeof(struct gfs2_meta_header);
227 }
228
229out:
230 error = gfs2_meta_inode_buffer(ip, &dibh);
231 if (error)
232 return error;
233
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100234 if (ip->i_inode.i_size < offset + copied)
235 i_size_write(&ip->i_inode, offset + copied);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100236 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000237
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000238 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500239 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000240 brelse(dibh);
241
242 return copied;
243fail:
244 if (copied)
245 goto out;
246 return error;
247}
248
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100249static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, __be64 *buf,
250 unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000251{
252 struct buffer_head *dibh;
253 int error;
254
255 error = gfs2_meta_inode_buffer(ip, &dibh);
256 if (!error) {
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100257 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000258 brelse(dibh);
259 }
260
261 return (error) ? error : size;
262}
263
264
265/**
266 * gfs2_dir_read_data - Read a data from a directory inode
267 * @ip: The GFS2 Inode
268 * @buf: The buffer to place result into
Steven Whitehousee13940b2006-01-30 13:31:50 +0000269 * @size: Amount of data to transfer
270 *
271 * Returns: The amount of data actually copied or the error
272 */
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100273static int gfs2_dir_read_data(struct gfs2_inode *ip, __be64 *buf,
274 unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000275{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400276 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousecd915492006-09-04 12:49:07 -0400277 u64 lblock, dblock;
278 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000279 unsigned int o;
280 int copied = 0;
281 int error = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000282
283 if (gfs2_is_stuffed(ip))
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100284 return gfs2_dir_read_stuffed(ip, buf, size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000285
286 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
287 return -EINVAL;
288
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100289 lblock = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000290 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
291
292 while (copied < size) {
293 unsigned int amount;
294 struct buffer_head *bh;
295 int new;
296
297 amount = size - copied;
298 if (amount > sdp->sd_sb.sb_bsize - o)
299 amount = sdp->sd_sb.sb_bsize - o;
300
301 if (!extlen) {
302 new = 0;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400303 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400304 &dblock, &extlen);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400305 if (error || !dblock)
306 goto fail;
307 BUG_ON(extlen < 1);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400308 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
Adrian Bunkb7d8ac32006-10-19 16:02:07 +0200309 } else {
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -0600310 error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, 0, &bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000311 if (error)
312 goto fail;
313 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400314 error = gfs2_metatype_check(sdp, bh, GFS2_METATYPE_JD);
315 if (error) {
316 brelse(bh);
317 goto fail;
318 }
319 dblock++;
320 extlen--;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000321 memcpy(buf, bh->b_data + o, amount);
322 brelse(bh);
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100323 buf += (amount/sizeof(__be64));
Steven Whitehousee13940b2006-01-30 13:31:50 +0000324 copied += amount;
325 lblock++;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000326 o = sizeof(struct gfs2_meta_header);
327 }
328
329 return copied;
330fail:
331 return (copied) ? copied : error;
332}
333
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100334/**
335 * gfs2_dir_get_hash_table - Get pointer to the dir hash table
336 * @ip: The inode in question
337 *
338 * Returns: The hash table or an error
339 */
340
341static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
342{
343 struct inode *inode = &ip->i_inode;
344 int ret;
345 u32 hsize;
346 __be64 *hc;
347
348 BUG_ON(!(ip->i_diskflags & GFS2_DIF_EXHASH));
349
350 hc = ip->i_hash_cache;
351 if (hc)
352 return hc;
353
354 hsize = 1 << ip->i_depth;
355 hsize *= sizeof(__be64);
356 if (hsize != i_size_read(&ip->i_inode)) {
357 gfs2_consist_inode(ip);
358 return ERR_PTR(-EIO);
359 }
360
Bob Petersone8830d82013-05-30 09:48:56 -0400361 hc = kmalloc(hsize, GFP_NOFS | __GFP_NOWARN);
362 if (hc == NULL)
363 hc = __vmalloc(hsize, GFP_NOFS, PAGE_KERNEL);
364
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100365 if (hc == NULL)
366 return ERR_PTR(-ENOMEM);
367
Steven Whitehouse4c28d332011-07-26 09:17:28 +0100368 ret = gfs2_dir_read_data(ip, hc, hsize);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100369 if (ret < 0) {
Al Viro3cdcf632014-11-20 05:18:38 +0000370 kvfree(hc);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100371 return ERR_PTR(ret);
372 }
373
374 spin_lock(&inode->i_lock);
Al Viro9265f1d2014-11-20 05:19:47 +0000375 if (likely(!ip->i_hash_cache)) {
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100376 ip->i_hash_cache = hc;
Al Viro9265f1d2014-11-20 05:19:47 +0000377 hc = NULL;
378 }
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100379 spin_unlock(&inode->i_lock);
Al Viro9265f1d2014-11-20 05:19:47 +0000380 kvfree(hc);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100381
382 return ip->i_hash_cache;
383}
384
385/**
386 * gfs2_dir_hash_inval - Invalidate dir hash
387 * @ip: The directory inode
388 *
389 * Must be called with an exclusive glock, or during glock invalidation.
390 */
391void gfs2_dir_hash_inval(struct gfs2_inode *ip)
392{
Bob Petersonc36b97e2015-10-29 10:03:41 -0500393 __be64 *hc;
394
395 spin_lock(&ip->i_inode.i_lock);
396 hc = ip->i_hash_cache;
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100397 ip->i_hash_cache = NULL;
Bob Petersonc36b97e2015-10-29 10:03:41 -0500398 spin_unlock(&ip->i_inode.i_lock);
399
Al Viro3cdcf632014-11-20 05:18:38 +0000400 kvfree(hc);
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100401}
402
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500403static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent)
404{
405 return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0;
406}
407
Steven Whitehousec7526662006-03-20 12:30:04 -0500408static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent,
409 const struct qstr *name, int ret)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000410{
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500411 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500412 be32_to_cpu(dent->de_hash) == name->hash &&
413 be16_to_cpu(dent->de_name_len) == name->len &&
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400414 memcmp(dent+1, name->name, name->len) == 0)
Steven Whitehousec7526662006-03-20 12:30:04 -0500415 return ret;
416 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000417}
418
Steven Whitehousec7526662006-03-20 12:30:04 -0500419static int gfs2_dirent_find(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, 1);
424}
425
426static int gfs2_dirent_prev(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500427 const struct qstr *name,
428 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500429{
430 return __gfs2_dirent_find(dent, name, 2);
431}
432
433/*
434 * name->name holds ptr to start of block.
435 * name->len holds size of block.
436 */
437static int gfs2_dirent_last(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500438 const struct qstr *name,
439 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500440{
441 const char *start = name->name;
442 const char *end = (const char *)dent + be16_to_cpu(dent->de_rec_len);
443 if (name->len == (end - start))
444 return 1;
445 return 0;
446}
447
Benjamin Marzinski34017472015-12-01 08:30:34 -0600448/* Look for the dirent that contains the offset specified in data. Once we
449 * find that dirent, there must be space available there for the new dirent */
450static int gfs2_dirent_find_offset(const struct gfs2_dirent *dent,
451 const struct qstr *name,
452 void *ptr)
453{
454 unsigned required = GFS2_DIRENT_SIZE(name->len);
455 unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
456 unsigned totlen = be16_to_cpu(dent->de_rec_len);
457
458 if (ptr < (void *)dent || ptr >= (void *)dent + totlen)
459 return 0;
460 if (gfs2_dirent_sentinel(dent))
461 actual = 0;
462 if (ptr < (void *)dent + actual)
463 return -1;
464 if ((void *)dent + totlen >= ptr + required)
465 return 1;
466 return -1;
467}
468
Steven Whitehousec7526662006-03-20 12:30:04 -0500469static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500470 const struct qstr *name,
471 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500472{
473 unsigned required = GFS2_DIRENT_SIZE(name->len);
474 unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
475 unsigned totlen = be16_to_cpu(dent->de_rec_len);
476
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500477 if (gfs2_dirent_sentinel(dent))
Bob Peterson728a7562010-07-14 18:12:26 -0400478 actual = 0;
Jan Engelhardtc53921242006-09-05 14:30:40 +0200479 if (totlen - actual >= required)
Steven Whitehousec7526662006-03-20 12:30:04 -0500480 return 1;
481 return 0;
482}
483
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500484struct dirent_gather {
485 const struct gfs2_dirent **pdent;
486 unsigned offset;
487};
488
489static int gfs2_dirent_gather(const struct gfs2_dirent *dent,
490 const struct qstr *name,
491 void *opaque)
492{
493 struct dirent_gather *g = opaque;
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500494 if (!gfs2_dirent_sentinel(dent)) {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500495 g->pdent[g->offset++] = dent;
496 }
497 return 0;
498}
499
Steven Whitehousec7526662006-03-20 12:30:04 -0500500/*
501 * Other possible things to check:
502 * - Inode located within filesystem size (and on valid block)
503 * - Valid directory entry type
504 * Not sure how heavy-weight we want to make this... could also check
505 * hash is correct for example, but that would take a lot of extra time.
506 * For now the most important thing is to check that the various sizes
507 * are correct.
508 */
509static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset,
510 unsigned int size, unsigned int len, int first)
511{
512 const char *msg = "gfs2_dirent too small";
513 if (unlikely(size < sizeof(struct gfs2_dirent)))
514 goto error;
515 msg = "gfs2_dirent misaligned";
516 if (unlikely(offset & 0x7))
517 goto error;
518 msg = "gfs2_dirent points beyond end of block";
519 if (unlikely(offset + size > len))
520 goto error;
521 msg = "zero inode number";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500522 if (unlikely(!first && gfs2_dirent_sentinel(dent)))
Steven Whitehousec7526662006-03-20 12:30:04 -0500523 goto error;
524 msg = "name length is greater than space in dirent";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500525 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500526 unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) >
527 size))
528 goto error;
529 return 0;
530error:
Joe Perchesd77d1b52014-03-06 12:10:45 -0800531 pr_warn("%s: %s (%s)\n",
532 __func__, msg, first ? "first in block" : "not first in block");
Steven Whitehousec7526662006-03-20 12:30:04 -0500533 return -EIO;
534}
535
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500536static int gfs2_dirent_offset(const void *buf)
Steven Whitehousec7526662006-03-20 12:30:04 -0500537{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500538 const struct gfs2_meta_header *h = buf;
539 int offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500540
541 BUG_ON(buf == NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500542
Steven Whitehousee3167de2006-03-30 15:46:23 -0500543 switch(be32_to_cpu(h->mh_type)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500544 case GFS2_METATYPE_LF:
545 offset = sizeof(struct gfs2_leaf);
546 break;
547 case GFS2_METATYPE_DI:
548 offset = sizeof(struct gfs2_dinode);
549 break;
550 default:
551 goto wrong_type;
552 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500553 return offset;
554wrong_type:
Joe Perchesd77d1b52014-03-06 12:10:45 -0800555 pr_warn("%s: wrong block type %u\n", __func__, be32_to_cpu(h->mh_type));
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500556 return -1;
557}
Steven Whitehousec7526662006-03-20 12:30:04 -0500558
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400559static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500560 unsigned int len, gfs2_dscan_t scan,
561 const struct qstr *name,
562 void *opaque)
563{
564 struct gfs2_dirent *dent, *prev;
565 unsigned offset;
566 unsigned size;
567 int ret = 0;
568
569 ret = gfs2_dirent_offset(buf);
570 if (ret < 0)
571 goto consist_inode;
572
573 offset = ret;
Steven Whitehousec7526662006-03-20 12:30:04 -0500574 prev = NULL;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400575 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500576 size = be16_to_cpu(dent->de_rec_len);
577 if (gfs2_check_dirent(dent, offset, size, len, 1))
578 goto consist_inode;
579 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500580 ret = scan(dent, name, opaque);
Steven Whitehousec7526662006-03-20 12:30:04 -0500581 if (ret)
582 break;
583 offset += size;
584 if (offset == len)
585 break;
586 prev = dent;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400587 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500588 size = be16_to_cpu(dent->de_rec_len);
589 if (gfs2_check_dirent(dent, offset, size, len, 0))
590 goto consist_inode;
591 } while(1);
592
593 switch(ret) {
594 case 0:
595 return NULL;
596 case 1:
597 return dent;
598 case 2:
599 return prev ? prev : dent;
600 default:
601 BUG_ON(ret > 0);
602 return ERR_PTR(ret);
603 }
604
Steven Whitehousec7526662006-03-20 12:30:04 -0500605consist_inode:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400606 gfs2_consist_inode(GFS2_I(inode));
Steven Whitehousec7526662006-03-20 12:30:04 -0500607 return ERR_PTR(-EIO);
608}
609
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400610static int dirent_check_reclen(struct gfs2_inode *dip,
611 const struct gfs2_dirent *d, const void *end_p)
612{
613 const void *ptr = d;
614 u16 rec_len = be16_to_cpu(d->de_rec_len);
615
616 if (unlikely(rec_len < sizeof(struct gfs2_dirent)))
617 goto broken;
618 ptr += rec_len;
619 if (ptr < end_p)
620 return rec_len;
621 if (ptr == end_p)
622 return -ENOENT;
623broken:
624 gfs2_consist_inode(dip);
625 return -EIO;
626}
627
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628/**
629 * dirent_next - Next dirent
630 * @dip: the directory
631 * @bh: The buffer
632 * @dent: Pointer to list of dirents
633 *
634 * Returns: 0 on success, error code otherwise
635 */
636
637static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
638 struct gfs2_dirent **dent)
639{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400640 struct gfs2_dirent *cur = *dent, *tmp;
641 char *bh_end = bh->b_data + bh->b_size;
642 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000643
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400644 ret = dirent_check_reclen(dip, cur, bh_end);
645 if (ret < 0)
646 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000647
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400648 tmp = (void *)cur + ret;
649 ret = dirent_check_reclen(dip, tmp, bh_end);
650 if (ret == -EIO)
651 return ret;
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000652
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653 /* Only the first dent could ever have de_inum.no_addr == 0 */
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500654 if (gfs2_dirent_sentinel(tmp)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000655 gfs2_consist_inode(dip);
656 return -EIO;
657 }
658
659 *dent = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000660 return 0;
661}
662
663/**
664 * dirent_del - Delete a dirent
665 * @dip: The GFS2 inode
666 * @bh: The buffer
667 * @prev: The previous dirent
668 * @cur: The current dirent
669 *
670 */
671
672static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
673 struct gfs2_dirent *prev, struct gfs2_dirent *cur)
674{
Steven Whitehousecd915492006-09-04 12:49:07 -0400675 u16 cur_rec_len, prev_rec_len;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000676
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500677 if (gfs2_dirent_sentinel(cur)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000678 gfs2_consist_inode(dip);
679 return;
680 }
681
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000682 gfs2_trans_add_meta(dip->i_gl, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000683
684 /* If there is no prev entry, this is the first entry in the block.
685 The de_rec_len is already as big as it needs to be. Just zero
686 out the inode number and return. */
687
688 if (!prev) {
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500689 cur->de_inum.no_addr = 0;
690 cur->de_inum.no_formal_ino = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000691 return;
692 }
693
694 /* Combine this dentry with the previous one. */
695
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000696 prev_rec_len = be16_to_cpu(prev->de_rec_len);
697 cur_rec_len = be16_to_cpu(cur->de_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000698
699 if ((char *)prev + prev_rec_len != (char *)cur)
700 gfs2_consist_inode(dip);
701 if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size)
702 gfs2_consist_inode(dip);
703
704 prev_rec_len += cur_rec_len;
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000705 prev->de_rec_len = cpu_to_be16(prev_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000706}
707
Benjamin Marzinski34017472015-12-01 08:30:34 -0600708
709static struct gfs2_dirent *do_init_dirent(struct inode *inode,
710 struct gfs2_dirent *dent,
711 const struct qstr *name,
712 struct buffer_head *bh,
713 unsigned offset)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000714{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400715 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -0500716 struct gfs2_dirent *ndent;
Benjamin Marzinski34017472015-12-01 08:30:34 -0600717 unsigned totlen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000718
Steven Whitehousec7526662006-03-20 12:30:04 -0500719 totlen = be16_to_cpu(dent->de_rec_len);
720 BUG_ON(offset + name->len > totlen);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000721 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500722 ndent = (struct gfs2_dirent *)((char *)dent + offset);
723 dent->de_rec_len = cpu_to_be16(offset);
724 gfs2_qstr2dirent(name, totlen - offset, ndent);
725 return ndent;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000726}
727
Benjamin Marzinski34017472015-12-01 08:30:34 -0600728
729/*
730 * Takes a dent from which to grab space as an argument. Returns the
731 * newly created dent.
732 */
733static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
734 struct gfs2_dirent *dent,
735 const struct qstr *name,
736 struct buffer_head *bh)
737{
738 unsigned offset = 0;
739
740 if (!gfs2_dirent_sentinel(dent))
741 offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
742 return do_init_dirent(inode, dent, name, bh, offset);
743}
744
745static struct gfs2_dirent *gfs2_dirent_split_alloc(struct inode *inode,
746 struct buffer_head *bh,
747 const struct qstr *name,
748 void *ptr)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000749{
750 struct gfs2_dirent *dent;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400751 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Benjamin Marzinski34017472015-12-01 08:30:34 -0600752 gfs2_dirent_find_offset, name, ptr);
Steven Whitehousec7526662006-03-20 12:30:04 -0500753 if (!dent || IS_ERR(dent))
754 return dent;
Benjamin Marzinski34017472015-12-01 08:30:34 -0600755 return do_init_dirent(inode, dent, name, bh,
756 (unsigned)(ptr - (void *)dent));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000757}
758
Steven Whitehousecd915492006-09-04 12:49:07 -0400759static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000760 struct buffer_head **bhp)
761{
762 int error;
763
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -0600764 error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, 0, bhp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400765 if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
Joe Perchesd77d1b52014-03-06 12:10:45 -0800766 /* pr_info("block num=%llu\n", leaf_no); */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000767 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400768 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000769
770 return error;
771}
772
773/**
774 * get_leaf_nr - Get a leaf number associated with the index
775 * @dip: The GFS2 inode
776 * @index:
777 * @leaf_out:
778 *
779 * Returns: 0 on success, error code otherwise
780 */
781
Steven Whitehousecd915492006-09-04 12:49:07 -0400782static int get_leaf_nr(struct gfs2_inode *dip, u32 index,
783 u64 *leaf_out)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000784{
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100785 __be64 *hash;
Arnd Bergmann287980e2016-05-27 23:23:25 +0200786 int error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000787
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100788 hash = gfs2_dir_get_hash_table(dip);
Arnd Bergmann287980e2016-05-27 23:23:25 +0200789 error = PTR_ERR_OR_ZERO(hash);
790
791 if (!error)
792 *leaf_out = be64_to_cpu(*(hash + index));
793
794 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000795}
796
Steven Whitehousecd915492006-09-04 12:49:07 -0400797static int get_first_leaf(struct gfs2_inode *dip, u32 index,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000798 struct buffer_head **bh_out)
799{
Steven Whitehousecd915492006-09-04 12:49:07 -0400800 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000801 int error;
802
803 error = get_leaf_nr(dip, index, &leaf_no);
Arnd Bergmann287980e2016-05-27 23:23:25 +0200804 if (!error)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000805 error = get_leaf(dip, leaf_no, bh_out);
806
807 return error;
808}
809
Steven Whitehousec7526662006-03-20 12:30:04 -0500810static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
811 const struct qstr *name,
812 gfs2_dscan_t scan,
813 struct buffer_head **pbh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000814{
Steven Whitehousec7526662006-03-20 12:30:04 -0500815 struct buffer_head *bh;
816 struct gfs2_dirent *dent;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400817 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000818 int error;
819
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000820 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500821 struct gfs2_leaf *leaf;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000822 unsigned hsize = 1 << ip->i_depth;
Steven Whitehousec7526662006-03-20 12:30:04 -0500823 unsigned index;
824 u64 ln;
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100825 if (hsize * sizeof(u64) != i_size_read(inode)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500826 gfs2_consist_inode(ip);
827 return ERR_PTR(-EIO);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000828 }
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400829
Steven Whitehouse9a004502008-02-01 09:23:44 +0000830 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500831 error = get_first_leaf(ip, index, &bh);
832 if (error)
833 return ERR_PTR(error);
834 do {
835 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500836 scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500837 if (dent)
838 goto got_dent;
839 leaf = (struct gfs2_leaf *)bh->b_data;
840 ln = be64_to_cpu(leaf->lf_next);
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400841 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500842 if (!ln)
843 break;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400844
Steven Whitehousec7526662006-03-20 12:30:04 -0500845 error = get_leaf(ip, ln, &bh);
846 } while(!error);
847
848 return error ? ERR_PTR(error) : NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000849 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000850
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400851
Steven Whitehousec7526662006-03-20 12:30:04 -0500852 error = gfs2_meta_inode_buffer(ip, &bh);
853 if (error)
854 return ERR_PTR(error);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500855 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500856got_dent:
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400857 if (unlikely(dent == NULL || IS_ERR(dent))) {
Steven Whitehouseed386502006-04-07 16:28:07 -0400858 brelse(bh);
859 bh = NULL;
860 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500861 *pbh = bh;
862 return dent;
863}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000864
Steven Whitehousec7526662006-03-20 12:30:04 -0500865static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth)
866{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400867 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000868 unsigned int n = 1;
Steven Whitehouse09010972009-05-20 10:48:47 +0100869 u64 bn;
870 int error;
871 struct buffer_head *bh;
Steven Whitehousec7526662006-03-20 12:30:04 -0500872 struct gfs2_leaf *leaf;
873 struct gfs2_dirent *dent;
Linus Torvalds26fe5752012-05-10 13:14:12 -0700874 struct qstr name = { .name = "" };
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +0000875 struct timespec tv = CURRENT_TIME;
Steven Whitehouse09010972009-05-20 10:48:47 +0100876
Bob Peterson6e87ed02011-11-18 10:58:32 -0500877 error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100878 if (error)
879 return NULL;
880 bh = gfs2_meta_new(ip->i_gl, bn);
Steven Whitehousec7526662006-03-20 12:30:04 -0500881 if (!bh)
882 return NULL;
Steven Whitehouse09010972009-05-20 10:48:47 +0100883
Steven Whitehouse5731be52008-02-01 13:16:55 +0000884 gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000885 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500886 gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
887 leaf = (struct gfs2_leaf *)bh->b_data;
888 leaf->lf_depth = cpu_to_be16(depth);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400889 leaf->lf_entries = 0;
Al Viroa2d7d022006-10-14 16:49:30 +0100890 leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400891 leaf->lf_next = 0;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +0000892 leaf->lf_inode = cpu_to_be64(ip->i_no_addr);
893 leaf->lf_dist = cpu_to_be32(1);
894 leaf->lf_nsec = cpu_to_be32(tv.tv_nsec);
895 leaf->lf_sec = cpu_to_be64(tv.tv_sec);
896 memset(leaf->lf_reserved2, 0, sizeof(leaf->lf_reserved2));
Steven Whitehousec7526662006-03-20 12:30:04 -0500897 dent = (struct gfs2_dirent *)(leaf+1);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500898 gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent);
Steven Whitehousec7526662006-03-20 12:30:04 -0500899 *pbh = bh;
900 return leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000901}
902
903/**
904 * dir_make_exhash - Convert a stuffed directory into an ExHash directory
905 * @dip: The GFS2 inode
906 *
907 * Returns: 0 on success, error code otherwise
908 */
909
Steven Whitehousec7526662006-03-20 12:30:04 -0500910static int dir_make_exhash(struct inode *inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000911{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400912 struct gfs2_inode *dip = GFS2_I(inode);
913 struct gfs2_sbd *sdp = GFS2_SB(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000914 struct gfs2_dirent *dent;
Steven Whitehousec7526662006-03-20 12:30:04 -0500915 struct qstr args;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000916 struct buffer_head *bh, *dibh;
917 struct gfs2_leaf *leaf;
918 int y;
Steven Whitehousecd915492006-09-04 12:49:07 -0400919 u32 x;
Al Virob44b84d2006-10-14 10:46:30 -0400920 __be64 *lp;
921 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000922 int error;
923
924 error = gfs2_meta_inode_buffer(dip, &dibh);
925 if (error)
926 return error;
927
David Teiglandb3b94fa2006-01-16 16:50:04 +0000928 /* Turn over a new leaf */
929
Steven Whitehousec7526662006-03-20 12:30:04 -0500930 leaf = new_leaf(inode, &bh, 0);
931 if (!leaf)
932 return -ENOSPC;
933 bn = bh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000934
Steven Whitehousead6203f2008-11-03 13:59:19 +0000935 gfs2_assert(sdp, dip->i_entries < (1 << 16));
936 leaf->lf_entries = cpu_to_be16(dip->i_entries);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000937
938 /* Copy dirents */
939
940 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh,
941 sizeof(struct gfs2_dinode));
942
943 /* Find last entry */
944
945 x = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500946 args.len = bh->b_size - sizeof(struct gfs2_dinode) +
947 sizeof(struct gfs2_leaf);
948 args.name = bh->b_data;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400949 dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500950 gfs2_dirent_last, &args, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500951 if (!dent) {
952 brelse(bh);
953 brelse(dibh);
954 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000955 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500956 if (IS_ERR(dent)) {
957 brelse(bh);
958 brelse(dibh);
959 return PTR_ERR(dent);
960 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961
962 /* Adjust the last dirent's record length
963 (Remember that dent still points to the last entry.) */
964
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000965 dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) +
David Teiglandb3b94fa2006-01-16 16:50:04 +0000966 sizeof(struct gfs2_dinode) -
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000967 sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000968
969 brelse(bh);
970
971 /* We're done with the new leaf block, now setup the new
972 hash table. */
973
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000974 gfs2_trans_add_meta(dip->i_gl, dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
976
Al Virob44b84d2006-10-14 10:46:30 -0400977 lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000978
979 for (x = sdp->sd_hash_ptrs; x--; lp++)
980 *lp = cpu_to_be64(bn);
981
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100982 i_size_write(inode, sdp->sd_sb.sb_bsize / 2);
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000983 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000984 dip->i_diskflags |= GFS2_DIF_EXHASH;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985
986 for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000987 dip->i_depth = y;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000988
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500989 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000990
991 brelse(dibh);
992
993 return 0;
994}
995
996/**
997 * dir_split_leaf - Split a leaf block into two
998 * @dip: The GFS2 inode
999 * @index:
1000 * @leaf_no:
1001 *
1002 * Returns: 0 on success, error code on failure
1003 */
1004
Steven Whitehousec7526662006-03-20 12:30:04 -05001005static int dir_split_leaf(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001006{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001007 struct gfs2_inode *dip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001008 struct buffer_head *nbh, *obh, *dibh;
1009 struct gfs2_leaf *nleaf, *oleaf;
Steven Whitehouse4da3c642006-07-11 13:19:13 -04001010 struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new;
Steven Whitehousecd915492006-09-04 12:49:07 -04001011 u32 start, len, half_len, divider;
Al Virob44b84d2006-10-14 10:46:30 -04001012 u64 bn, leaf_no;
1013 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -04001014 u32 index;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001015 int x, moved = 0;
1016 int error;
1017
Steven Whitehouse9a004502008-02-01 09:23:44 +00001018 index = name->hash >> (32 - dip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -05001019 error = get_leaf_nr(dip, index, &leaf_no);
Arnd Bergmann287980e2016-05-27 23:23:25 +02001020 if (error)
Steven Whitehousec7526662006-03-20 12:30:04 -05001021 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001022
1023 /* Get the old leaf block */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001024 error = get_leaf(dip, leaf_no, &obh);
1025 if (error)
Steven Whitehousee90deff2006-03-29 19:02:15 -05001026 return error;
1027
1028 oleaf = (struct gfs2_leaf *)obh->b_data;
Steven Whitehouse9a004502008-02-01 09:23:44 +00001029 if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) {
Steven Whitehousee90deff2006-03-29 19:02:15 -05001030 brelse(obh);
1031 return 1; /* can't split */
1032 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001033
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001034 gfs2_trans_add_meta(dip->i_gl, obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001035
Steven Whitehousec7526662006-03-20 12:30:04 -05001036 nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1);
1037 if (!nleaf) {
1038 brelse(obh);
1039 return -ENOSPC;
1040 }
1041 bn = nbh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001042
Steven Whitehousec7526662006-03-20 12:30:04 -05001043 /* Compute the start and len of leaf pointers in the hash table. */
Steven Whitehouse9a004502008-02-01 09:23:44 +00001044 len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001045 half_len = len >> 1;
1046 if (!half_len) {
Joe Perchesd77d1b52014-03-06 12:10:45 -08001047 pr_warn("i_depth %u lf_depth %u index %u\n",
1048 dip->i_depth, be16_to_cpu(oleaf->lf_depth), index);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001049 gfs2_consist_inode(dip);
1050 error = -EIO;
1051 goto fail_brelse;
1052 }
1053
1054 start = (index & ~(len - 1));
1055
1056 /* Change the pointers.
1057 Don't bother distinguishing stuffed from non-stuffed.
1058 This code is complicated enough already. */
David Rientjes4244b522010-07-20 19:45:03 -07001059 lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS);
1060 if (!lp) {
1061 error = -ENOMEM;
1062 goto fail_brelse;
1063 }
1064
David Teiglandb3b94fa2006-01-16 16:50:04 +00001065 /* Change the pointers */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001066 for (x = 0; x < half_len; x++)
1067 lp[x] = cpu_to_be64(bn);
1068
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001069 gfs2_dir_hash_inval(dip);
1070
Steven Whitehousecd915492006-09-04 12:49:07 -04001071 error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64),
1072 half_len * sizeof(u64));
1073 if (error != half_len * sizeof(u64)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001074 if (error >= 0)
1075 error = -EIO;
1076 goto fail_lpfree;
1077 }
1078
1079 kfree(lp);
1080
1081 /* Compute the divider */
Steven Whitehouse9a004502008-02-01 09:23:44 +00001082 divider = (start + half_len) << (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001083
1084 /* Copy the entries */
Steven Whitehouse15793432009-11-06 11:06:37 +00001085 dent = (struct gfs2_dirent *)(obh->b_data + sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001086
1087 do {
1088 next = dent;
1089 if (dirent_next(dip, obh, &next))
1090 next = NULL;
1091
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -05001092 if (!gfs2_dirent_sentinel(dent) &&
David Teiglandb3b94fa2006-01-16 16:50:04 +00001093 be32_to_cpu(dent->de_hash) < divider) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001094 struct qstr str;
Benjamin Marzinski34017472015-12-01 08:30:34 -06001095 void *ptr = ((char *)dent - obh->b_data) + nbh->b_data;
Steven Whitehousec7526662006-03-20 12:30:04 -05001096 str.name = (char*)(dent+1);
1097 str.len = be16_to_cpu(dent->de_name_len);
1098 str.hash = be32_to_cpu(dent->de_hash);
Benjamin Marzinski34017472015-12-01 08:30:34 -06001099 new = gfs2_dirent_split_alloc(inode, nbh, &str, ptr);
Steven Whitehousec7526662006-03-20 12:30:04 -05001100 if (IS_ERR(new)) {
1101 error = PTR_ERR(new);
1102 break;
1103 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001104
1105 new->de_inum = dent->de_inum; /* No endian worries */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001106 new->de_type = dent->de_type; /* No endian worries */
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001107 be16_add_cpu(&nleaf->lf_entries, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001108
1109 dirent_del(dip, obh, prev, dent);
1110
1111 if (!oleaf->lf_entries)
1112 gfs2_consist_inode(dip);
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001113 be16_add_cpu(&oleaf->lf_entries, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001114
1115 if (!prev)
1116 prev = dent;
1117
1118 moved = 1;
Steven Whitehousec7526662006-03-20 12:30:04 -05001119 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001120 prev = dent;
Steven Whitehousec7526662006-03-20 12:30:04 -05001121 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001122 dent = next;
Steven Whitehousec7526662006-03-20 12:30:04 -05001123 } while (dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001124
Steven Whitehousec7526662006-03-20 12:30:04 -05001125 oleaf->lf_depth = nleaf->lf_depth;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001126
1127 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001128 if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) {
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001129 gfs2_trans_add_meta(dip->i_gl, dibh);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001130 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001131 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001132 brelse(dibh);
1133 }
1134
1135 brelse(obh);
1136 brelse(nbh);
1137
1138 return error;
1139
Steven Whitehousee90deff2006-03-29 19:02:15 -05001140fail_lpfree:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001141 kfree(lp);
1142
Steven Whitehousee90deff2006-03-29 19:02:15 -05001143fail_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001144 brelse(obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001145 brelse(nbh);
1146 return error;
1147}
1148
1149/**
1150 * dir_double_exhash - Double size of ExHash table
1151 * @dip: The GFS2 dinode
1152 *
1153 * Returns: 0 on success, error code on failure
1154 */
1155
1156static int dir_double_exhash(struct gfs2_inode *dip)
1157{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001158 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001159 u32 hsize;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001160 u32 hsize_bytes;
1161 __be64 *hc;
1162 __be64 *hc2, *h;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001163 int x;
1164 int error = 0;
1165
Steven Whitehouse9a004502008-02-01 09:23:44 +00001166 hsize = 1 << dip->i_depth;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001167 hsize_bytes = hsize * sizeof(__be64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001168
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001169 hc = gfs2_dir_get_hash_table(dip);
1170 if (IS_ERR(hc))
1171 return PTR_ERR(hc);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001172
Bob Peterson512cbf02013-06-14 08:39:18 -04001173 hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS | __GFP_NOWARN);
Bob Petersone8830d82013-05-30 09:48:56 -04001174 if (hc2 == NULL)
1175 hc2 = __vmalloc(hsize_bytes * 2, GFP_NOFS, PAGE_KERNEL);
1176
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001177 if (!hc2)
David Rientjes4244b522010-07-20 19:45:03 -07001178 return -ENOMEM;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001179
Bob Peterson512cbf02013-06-14 08:39:18 -04001180 h = hc2;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001181 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001182 if (error)
1183 goto out_kfree;
1184
1185 for (x = 0; x < hsize; x++) {
1186 *h++ = *hc;
1187 *h++ = *hc;
1188 hc++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001189 }
1190
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001191 error = gfs2_dir_write_data(dip, (char *)hc2, 0, hsize_bytes * 2);
1192 if (error != (hsize_bytes * 2))
1193 goto fail;
1194
1195 gfs2_dir_hash_inval(dip);
1196 dip->i_hash_cache = hc2;
1197 dip->i_depth++;
1198 gfs2_dinode_out(dip, dibh->b_data);
1199 brelse(dibh);
1200 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001201
Steven Whitehousea91ea692006-09-04 12:04:26 -04001202fail:
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001203 /* Replace original hash table & size */
1204 gfs2_dir_write_data(dip, (char *)hc, 0, hsize_bytes);
1205 i_size_write(&dip->i_inode, hsize_bytes);
1206 gfs2_dinode_out(dip, dibh->b_data);
1207 brelse(dibh);
1208out_kfree:
Al Viro3cdcf632014-11-20 05:18:38 +00001209 kvfree(hc2);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001210 return error;
1211}
1212
1213/**
1214 * compare_dents - compare directory entries by hash value
1215 * @a: first dent
1216 * @b: second dent
1217 *
1218 * When comparing the hash entries of @a to @b:
1219 * gt: returns 1
1220 * lt: returns -1
1221 * eq: returns 0
1222 */
1223
1224static int compare_dents(const void *a, const void *b)
1225{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001226 const struct gfs2_dirent *dent_a, *dent_b;
Steven Whitehousecd915492006-09-04 12:49:07 -04001227 u32 hash_a, hash_b;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001228 int ret = 0;
1229
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001230 dent_a = *(const struct gfs2_dirent **)a;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001231 hash_a = dent_a->de_cookie;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001232
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001233 dent_b = *(const struct gfs2_dirent **)b;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001234 hash_b = dent_b->de_cookie;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001235
1236 if (hash_a > hash_b)
1237 ret = 1;
1238 else if (hash_a < hash_b)
1239 ret = -1;
1240 else {
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001241 unsigned int len_a = be16_to_cpu(dent_a->de_name_len);
1242 unsigned int len_b = be16_to_cpu(dent_b->de_name_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001243
1244 if (len_a > len_b)
1245 ret = 1;
1246 else if (len_a < len_b)
1247 ret = -1;
1248 else
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001249 ret = memcmp(dent_a + 1, dent_b + 1, len_a);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001250 }
1251
1252 return ret;
1253}
1254
1255/**
1256 * do_filldir_main - read out directory entries
1257 * @dip: The GFS2 inode
Al Virod81a8ef2013-05-16 14:14:48 -04001258 * @ctx: what to feed the entries to
David Teiglandb3b94fa2006-01-16 16:50:04 +00001259 * @darr: an array of struct gfs2_dirent pointers to read
1260 * @entries: the number of entries in darr
1261 * @copied: pointer to int that's non-zero if a entry has been copied out
1262 *
1263 * Jump through some hoops to make sure that if there are hash collsions,
1264 * they are read out at the beginning of a buffer. We want to minimize
1265 * the possibility that they will fall into different readdir buffers or
1266 * that someone will want to seek to that location.
1267 *
Al Virod81a8ef2013-05-16 14:14:48 -04001268 * Returns: errno, >0 if the actor tells you to stop
David Teiglandb3b94fa2006-01-16 16:50:04 +00001269 */
1270
Al Virod81a8ef2013-05-16 14:14:48 -04001271static int do_filldir_main(struct gfs2_inode *dip, struct dir_context *ctx,
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001272 struct gfs2_dirent **darr, u32 entries,
1273 u32 sort_start, int *copied)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001274{
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001275 const struct gfs2_dirent *dent, *dent_next;
Steven Whitehousecd915492006-09-04 12:49:07 -04001276 u64 off, off_next;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001277 unsigned int x, y;
1278 int run = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001279
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001280 if (sort_start < entries)
1281 sort(&darr[sort_start], entries - sort_start,
1282 sizeof(struct gfs2_dirent *), compare_dents, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001283
1284 dent_next = darr[0];
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001285 off_next = dent_next->de_cookie;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001286
1287 for (x = 0, y = 1; x < entries; x++, y++) {
1288 dent = dent_next;
1289 off = off_next;
1290
1291 if (y < entries) {
1292 dent_next = darr[y];
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001293 off_next = dent_next->de_cookie;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001294
Al Virod81a8ef2013-05-16 14:14:48 -04001295 if (off < ctx->pos)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001296 continue;
Al Virod81a8ef2013-05-16 14:14:48 -04001297 ctx->pos = off;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001298
1299 if (off_next == off) {
1300 if (*copied && !run)
1301 return 1;
1302 run = 1;
1303 } else
1304 run = 0;
1305 } else {
Al Virod81a8ef2013-05-16 14:14:48 -04001306 if (off < ctx->pos)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001307 continue;
Al Virod81a8ef2013-05-16 14:14:48 -04001308 ctx->pos = off;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001309 }
1310
Al Virod81a8ef2013-05-16 14:14:48 -04001311 if (!dir_emit(ctx, (const char *)(dent + 1),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001312 be16_to_cpu(dent->de_name_len),
Al Virod81a8ef2013-05-16 14:14:48 -04001313 be64_to_cpu(dent->de_inum.no_addr),
1314 be16_to_cpu(dent->de_type)))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001315 return 1;
1316
1317 *copied = 1;
1318 }
1319
Al Virod81a8ef2013-05-16 14:14:48 -04001320 /* Increment the ctx->pos by one, so the next time we come into the
David Teiglandb3b94fa2006-01-16 16:50:04 +00001321 do_filldir fxn, we get the next entry instead of the last one in the
1322 current leaf */
1323
Al Virod81a8ef2013-05-16 14:14:48 -04001324 ctx->pos++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001325
1326 return 0;
1327}
1328
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001329static void *gfs2_alloc_sort_buffer(unsigned size)
1330{
1331 void *ptr = NULL;
1332
1333 if (size < KMALLOC_MAX_SIZE)
1334 ptr = kmalloc(size, GFP_NOFS | __GFP_NOWARN);
1335 if (!ptr)
1336 ptr = __vmalloc(size, GFP_NOFS, PAGE_KERNEL);
1337 return ptr;
1338}
1339
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001340
1341static int gfs2_set_cookies(struct gfs2_sbd *sdp, struct buffer_head *bh,
1342 unsigned leaf_nr, struct gfs2_dirent **darr,
1343 unsigned entries)
1344{
1345 int sort_id = -1;
1346 int i;
1347
1348 for (i = 0; i < entries; i++) {
1349 unsigned offset;
1350
1351 darr[i]->de_cookie = be32_to_cpu(darr[i]->de_hash);
1352 darr[i]->de_cookie = gfs2_disk_hash2offset(darr[i]->de_cookie);
1353
1354 if (!sdp->sd_args.ar_loccookie)
1355 continue;
1356 offset = (char *)(darr[i]) -
1357 (bh->b_data + gfs2_dirent_offset(bh->b_data));
1358 offset /= GFS2_MIN_DIRENT_SIZE;
1359 offset += leaf_nr * sdp->sd_max_dents_per_leaf;
1360 if (offset >= GFS2_USE_HASH_FLAG ||
1361 leaf_nr >= GFS2_USE_HASH_FLAG) {
1362 darr[i]->de_cookie |= GFS2_USE_HASH_FLAG;
1363 if (sort_id < 0)
1364 sort_id = i;
1365 continue;
1366 }
1367 darr[i]->de_cookie &= GFS2_HASH_INDEX_MASK;
1368 darr[i]->de_cookie |= offset;
1369 }
1370 return sort_id;
1371}
1372
1373
Al Virod81a8ef2013-05-16 14:14:48 -04001374static int gfs2_dir_read_leaf(struct inode *inode, struct dir_context *ctx,
1375 int *copied, unsigned *depth,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001376 u64 leaf_no)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001377{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001378 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001379 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001380 struct buffer_head *bh;
1381 struct gfs2_leaf *lf;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001382 unsigned entries = 0, entries2 = 0;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001383 unsigned leaves = 0, leaf = 0, offset, sort_offset;
1384 struct gfs2_dirent **darr, *dent;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001385 struct dirent_gather g;
1386 struct buffer_head **larr;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001387 int error, i, need_sort = 0, sort_id;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001388 u64 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001389
David Teiglandb3b94fa2006-01-16 16:50:04 +00001390 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001391 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001392 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001393 goto out;
1394 lf = (struct gfs2_leaf *)bh->b_data;
1395 if (leaves == 0)
1396 *depth = be16_to_cpu(lf->lf_depth);
1397 entries += be16_to_cpu(lf->lf_entries);
1398 leaves++;
1399 lfn = be64_to_cpu(lf->lf_next);
1400 brelse(bh);
1401 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001402
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001403 if (*depth < GFS2_DIR_MAX_DEPTH || !sdp->sd_args.ar_loccookie) {
1404 need_sort = 1;
1405 sort_offset = 0;
1406 }
1407
David Teiglandb3b94fa2006-01-16 16:50:04 +00001408 if (!entries)
1409 return 0;
1410
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001411 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001412 /*
1413 * The extra 99 entries are not normally used, but are a buffer
1414 * zone in case the number of entries in the leaf is corrupt.
1415 * 99 is the maximum number of entries that can fit in a single
1416 * leaf block.
1417 */
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001418 larr = gfs2_alloc_sort_buffer((leaves + entries + 99) * sizeof(void *));
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001419 if (!larr)
1420 goto out;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001421 darr = (struct gfs2_dirent **)(larr + leaves);
1422 g.pdent = (const struct gfs2_dirent **)darr;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001423 g.offset = 0;
1424 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001425
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001426 do {
1427 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001428 if (error)
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001429 goto out_free;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001430 lf = (struct gfs2_leaf *)bh->b_data;
1431 lfn = be64_to_cpu(lf->lf_next);
1432 if (lf->lf_entries) {
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001433 offset = g.offset;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001434 entries2 += be16_to_cpu(lf->lf_entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001435 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
1436 gfs2_dirent_gather, NULL, &g);
1437 error = PTR_ERR(dent);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001438 if (IS_ERR(dent))
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001439 goto out_free;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001440 if (entries2 != g.offset) {
akpm@linux-foundation.orgf391a4e2007-04-25 21:08:02 -07001441 fs_warn(sdp, "Number of entries corrupt in dir "
1442 "leaf %llu, entries2 (%u) != "
1443 "g.offset (%u)\n",
1444 (unsigned long long)bh->b_blocknr,
1445 entries2, g.offset);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001446
1447 error = -EIO;
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001448 goto out_free;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001449 }
1450 error = 0;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001451 sort_id = gfs2_set_cookies(sdp, bh, leaf, &darr[offset],
1452 be16_to_cpu(lf->lf_entries));
1453 if (!need_sort && sort_id >= 0) {
1454 need_sort = 1;
1455 sort_offset = offset + sort_id;
1456 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001457 larr[leaf++] = bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001458 } else {
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001459 larr[leaf++] = NULL;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001460 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001461 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001462 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001463
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001464 BUG_ON(entries2 != entries);
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001465 error = do_filldir_main(ip, ctx, darr, entries, need_sort ?
1466 sort_offset : entries, copied);
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001467out_free:
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001468 for(i = 0; i < leaf; i++)
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001469 if (larr[i])
1470 brelse(larr[i]);
Al Viro3cdcf632014-11-20 05:18:38 +00001471 kvfree(larr);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001472out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001473 return error;
1474}
1475
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001476/**
1477 * gfs2_dir_readahead - Issue read-ahead requests for leaf blocks.
Bob Petersondfe4d342011-10-27 12:16:06 -04001478 *
1479 * Note: we can't calculate each index like dir_e_read can because we don't
1480 * have the leaf, and therefore we don't have the depth, and therefore we
1481 * don't have the length. So we have to just read enough ahead to make up
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001482 * for the loss of information.
1483 */
Bob Petersondfe4d342011-10-27 12:16:06 -04001484static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index,
1485 struct file_ra_state *f_ra)
1486{
1487 struct gfs2_inode *ip = GFS2_I(inode);
1488 struct gfs2_glock *gl = ip->i_gl;
1489 struct buffer_head *bh;
1490 u64 blocknr = 0, last;
1491 unsigned count;
1492
1493 /* First check if we've already read-ahead for the whole range. */
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001494 if (index + MAX_RA_BLOCKS < f_ra->start)
Bob Petersondfe4d342011-10-27 12:16:06 -04001495 return;
1496
1497 f_ra->start = max((pgoff_t)index, f_ra->start);
1498 for (count = 0; count < MAX_RA_BLOCKS; count++) {
1499 if (f_ra->start >= hsize) /* if exceeded the hash table */
1500 break;
1501
1502 last = blocknr;
1503 blocknr = be64_to_cpu(ip->i_hash_cache[f_ra->start]);
1504 f_ra->start++;
1505 if (blocknr == last)
1506 continue;
1507
1508 bh = gfs2_getbuf(gl, blocknr, 1);
1509 if (trylock_buffer(bh)) {
1510 if (buffer_uptodate(bh)) {
1511 unlock_buffer(bh);
1512 brelse(bh);
1513 continue;
1514 }
1515 bh->b_end_io = end_buffer_read_sync;
1516 submit_bh(READA | REQ_META, bh);
1517 continue;
1518 }
1519 brelse(bh);
1520 }
1521}
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001522
David Teiglandb3b94fa2006-01-16 16:50:04 +00001523/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001524 * dir_e_read - Reads the entries from a directory into a filldir buffer
1525 * @dip: dinode pointer
Al Virod81a8ef2013-05-16 14:14:48 -04001526 * @ctx: actor to feed the entries to
David Teiglandb3b94fa2006-01-16 16:50:04 +00001527 *
1528 * Returns: errno
1529 */
1530
Al Virod81a8ef2013-05-16 14:14:48 -04001531static int dir_e_read(struct inode *inode, struct dir_context *ctx,
1532 struct file_ra_state *f_ra)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001533{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001534 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousecd915492006-09-04 12:49:07 -04001535 u32 hsize, len = 0;
Steven Whitehousecd915492006-09-04 12:49:07 -04001536 u32 hash, index;
Al Virob44b84d2006-10-14 10:46:30 -04001537 __be64 *lp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001538 int copied = 0;
1539 int error = 0;
Steven Whitehouse4da3c642006-07-11 13:19:13 -04001540 unsigned depth = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001541
Steven Whitehouse9a004502008-02-01 09:23:44 +00001542 hsize = 1 << dip->i_depth;
Al Virod81a8ef2013-05-16 14:14:48 -04001543 hash = gfs2_dir_offset2hash(ctx->pos);
Steven Whitehouse9a004502008-02-01 09:23:44 +00001544 index = hash >> (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001545
Steven Whitehouse79c4c372011-11-09 13:46:06 +00001546 if (dip->i_hash_cache == NULL)
Bob Petersondfe4d342011-10-27 12:16:06 -04001547 f_ra->start = 0;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001548 lp = gfs2_dir_get_hash_table(dip);
1549 if (IS_ERR(lp))
1550 return PTR_ERR(lp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001551
Bob Petersondfe4d342011-10-27 12:16:06 -04001552 gfs2_dir_readahead(inode, hsize, index, f_ra);
1553
David Teiglandb3b94fa2006-01-16 16:50:04 +00001554 while (index < hsize) {
Al Virod81a8ef2013-05-16 14:14:48 -04001555 error = gfs2_dir_read_leaf(inode, ctx,
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001556 &copied, &depth,
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001557 be64_to_cpu(lp[index]));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001558 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001559 break;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001560
Steven Whitehouse9a004502008-02-01 09:23:44 +00001561 len = 1 << (dip->i_depth - depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001562 index = (index & ~(len - 1)) + len;
1563 }
1564
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001565 if (error > 0)
1566 error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001567 return error;
1568}
1569
Al Virod81a8ef2013-05-16 14:14:48 -04001570int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
1571 struct file_ra_state *f_ra)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001572{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001573 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001574 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001575 struct dirent_gather g;
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001576 struct gfs2_dirent **darr, *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001577 struct buffer_head *dibh;
1578 int copied = 0;
1579 int error;
1580
Steven Whitehousead6203f2008-11-03 13:59:19 +00001581 if (!dip->i_entries)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001582 return 0;
1583
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001584 if (dip->i_diskflags & GFS2_DIF_EXHASH)
Al Virod81a8ef2013-05-16 14:14:48 -04001585 return dir_e_read(inode, ctx, f_ra);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001586
David Teiglandb3b94fa2006-01-16 16:50:04 +00001587 if (!gfs2_is_stuffed(dip)) {
1588 gfs2_consist_inode(dip);
1589 return -EIO;
1590 }
1591
David Teiglandb3b94fa2006-01-16 16:50:04 +00001592 error = gfs2_meta_inode_buffer(dip, &dibh);
1593 if (error)
1594 return error;
1595
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001596 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001597 /* 96 is max number of dirents which can be stuffed into an inode */
Josef Bacik16c5f062008-04-09 09:33:41 -04001598 darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_NOFS);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001599 if (darr) {
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001600 g.pdent = (const struct gfs2_dirent **)darr;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001601 g.offset = 0;
1602 dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size,
1603 gfs2_dirent_gather, NULL, &g);
1604 if (IS_ERR(dent)) {
1605 error = PTR_ERR(dent);
1606 goto out;
1607 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001608 if (dip->i_entries != g.offset) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001609 fs_warn(sdp, "Number of entries corrupt in dir %llu, "
Steven Whitehousead6203f2008-11-03 13:59:19 +00001610 "ip->i_entries (%u) != g.offset (%u)\n",
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001611 (unsigned long long)dip->i_no_addr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001612 dip->i_entries,
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001613 g.offset);
1614 error = -EIO;
1615 goto out;
1616 }
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001617 gfs2_set_cookies(sdp, dibh, 0, darr, dip->i_entries);
Al Virod81a8ef2013-05-16 14:14:48 -04001618 error = do_filldir_main(dip, ctx, darr,
Benjamin Marzinski471f3db2015-12-01 08:46:55 -06001619 dip->i_entries, 0, &copied);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001620out:
1621 kfree(darr);
1622 }
1623
David Teiglandb3b94fa2006-01-16 16:50:04 +00001624 if (error > 0)
1625 error = 0;
1626
1627 brelse(dibh);
1628
1629 return error;
1630}
1631
David Teiglandb3b94fa2006-01-16 16:50:04 +00001632/**
1633 * gfs2_dir_search - Search a directory
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001634 * @dip: The GFS2 dir inode
1635 * @name: The name we are looking up
1636 * @fail_on_exist: Fail if the name exists rather than looking it up
David Teiglandb3b94fa2006-01-16 16:50:04 +00001637 *
1638 * This routine searches a directory for a file or another directory.
1639 * Assumes a glock is held on dip.
1640 *
1641 * Returns: errno
1642 */
1643
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001644struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name,
1645 bool fail_on_exist)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001646{
Steven Whitehousec7526662006-03-20 12:30:04 -05001647 struct buffer_head *bh;
1648 struct gfs2_dirent *dent;
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001649 u64 addr, formal_ino;
1650 u16 dtype;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001651
1652 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1653 if (dent) {
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -06001654 struct inode *inode;
1655 u16 rahead;
1656
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001657 if (IS_ERR(dent))
David Howellse231c2e2008-02-07 00:15:26 -08001658 return ERR_CAST(dent);
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001659 dtype = be16_to_cpu(dent->de_type);
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -06001660 rahead = be16_to_cpu(dent->de_rahead);
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001661 addr = be64_to_cpu(dent->de_inum.no_addr);
1662 formal_ino = be64_to_cpu(dent->de_inum.no_formal_ino);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001663 brelse(bh);
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +01001664 if (fail_on_exist)
1665 return ERR_PTR(-EEXIST);
Bob Peterson73b462d2015-12-18 11:44:49 -06001666 inode = gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino);
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -06001667 if (!IS_ERR(inode))
1668 GFS2_I(inode)->i_rahead = rahead;
1669 return inode;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001670 }
1671 return ERR_PTR(-ENOENT);
1672}
1673
1674int gfs2_dir_check(struct inode *dir, const struct qstr *name,
1675 const struct gfs2_inode *ip)
1676{
1677 struct buffer_head *bh;
1678 struct gfs2_dirent *dent;
1679 int ret = -ENOENT;
Steven Whitehousec7526662006-03-20 12:30:04 -05001680
1681 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1682 if (dent) {
1683 if (IS_ERR(dent))
1684 return PTR_ERR(dent);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001685 if (ip) {
1686 if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr)
1687 goto out;
1688 if (be64_to_cpu(dent->de_inum.no_formal_ino) !=
1689 ip->i_no_formal_ino)
1690 goto out;
1691 if (unlikely(IF2DT(ip->i_inode.i_mode) !=
1692 be16_to_cpu(dent->de_type))) {
1693 gfs2_consist_inode(GFS2_I(dir));
1694 ret = -EIO;
1695 goto out;
1696 }
1697 }
1698 ret = 0;
1699out:
Steven Whitehousec7526662006-03-20 12:30:04 -05001700 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001701 }
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001702 return ret;
Steven Whitehousec7526662006-03-20 12:30:04 -05001703}
1704
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001705/**
1706 * dir_new_leaf - Add a new leaf onto hash chain
1707 * @inode: The directory
1708 * @name: The name we are adding
1709 *
1710 * This adds a new dir leaf onto an existing leaf when there is not
1711 * enough space to add a new dir entry. This is a last resort after
1712 * we've expanded the hash table to max size and also split existing
1713 * leaf blocks, so it will only occur for very large directories.
1714 *
1715 * The dist parameter is set to 1 for leaf blocks directly attached
1716 * to the hash table, 2 for one layer of indirection, 3 for two layers
1717 * etc. We are thus able to tell the difference between an old leaf
1718 * with dist set to zero (i.e. "don't know") and a new one where we
1719 * set this information for debug/fsck purposes.
1720 *
1721 * Returns: 0 on success, or -ve on error
1722 */
1723
Steven Whitehousec7526662006-03-20 12:30:04 -05001724static int dir_new_leaf(struct inode *inode, const struct qstr *name)
1725{
1726 struct buffer_head *bh, *obh;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001727 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001728 struct gfs2_leaf *leaf, *oleaf;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001729 u32 dist = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001730 int error;
Steven Whitehousec7526662006-03-20 12:30:04 -05001731 u32 index;
1732 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001733
Steven Whitehouse9a004502008-02-01 09:23:44 +00001734 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -05001735 error = get_first_leaf(ip, index, &obh);
1736 if (error)
1737 return error;
1738 do {
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001739 dist++;
Steven Whitehousec7526662006-03-20 12:30:04 -05001740 oleaf = (struct gfs2_leaf *)obh->b_data;
1741 bn = be64_to_cpu(oleaf->lf_next);
1742 if (!bn)
1743 break;
1744 brelse(obh);
1745 error = get_leaf(ip, bn, &obh);
1746 if (error)
1747 return error;
1748 } while(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001749
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001750 gfs2_trans_add_meta(ip->i_gl, obh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001751
1752 leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth));
1753 if (!leaf) {
1754 brelse(obh);
1755 return -ENOSPC;
1756 }
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001757 leaf->lf_dist = cpu_to_be32(dist);
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001758 oleaf->lf_next = cpu_to_be64(bh->b_blocknr);
Steven Whitehousec7526662006-03-20 12:30:04 -05001759 brelse(bh);
1760 brelse(obh);
1761
1762 error = gfs2_meta_inode_buffer(ip, &bh);
1763 if (error)
1764 return error;
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001765 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001766 gfs2_add_inode_blocks(&ip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001767 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001768 brelse(bh);
1769 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001770}
1771
Steven Whitehouse44aaada2014-02-07 11:23:22 +00001772static u16 gfs2_inode_ra_len(const struct gfs2_inode *ip)
1773{
1774 u64 where = ip->i_no_addr + 1;
1775 if (ip->i_eattr == where)
1776 return 1;
1777 return 0;
1778}
1779
David Teiglandb3b94fa2006-01-16 16:50:04 +00001780/**
1781 * gfs2_dir_add - Add new filename into directory
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001782 * @inode: The directory inode
1783 * @name: The new name
1784 * @nip: The GFS2 inode to be linked in to the directory
1785 * @da: The directory addition info
1786 *
1787 * If the call to gfs2_diradd_alloc_required resulted in there being
1788 * no need to allocate any new directory blocks, then it will contain
1789 * a pointer to the directory entry and the bh in which it resides. We
1790 * can use that without having to repeat the search. If there was no
1791 * free space, then we must now create more space.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001792 *
1793 * Returns: 0 on success, error code on failure
1794 */
1795
Steven Whitehousec7526662006-03-20 12:30:04 -05001796int gfs2_dir_add(struct inode *inode, const struct qstr *name,
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001797 const struct gfs2_inode *nip, struct gfs2_diradd *da)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001798{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001799 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001800 struct buffer_head *bh = da->bh;
1801 struct gfs2_dirent *dent = da->dent;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001802 struct timespec tv;
Steven Whitehousec7526662006-03-20 12:30:04 -05001803 struct gfs2_leaf *leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001804 int error;
1805
Steven Whitehousec7526662006-03-20 12:30:04 -05001806 while(1) {
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001807 if (da->bh == NULL) {
1808 dent = gfs2_dirent_search(inode, name,
1809 gfs2_dirent_find_space, &bh);
1810 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001811 if (dent) {
1812 if (IS_ERR(dent))
1813 return PTR_ERR(dent);
1814 dent = gfs2_init_dirent(inode, dent, name, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001815 gfs2_inum_out(nip, dent);
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001816 dent->de_type = cpu_to_be16(IF2DT(nip->i_inode.i_mode));
Steven Whitehouse44aaada2014-02-07 11:23:22 +00001817 dent->de_rahead = cpu_to_be16(gfs2_inode_ra_len(nip));
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001818 tv = CURRENT_TIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001819 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001820 leaf = (struct gfs2_leaf *)bh->b_data;
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001821 be16_add_cpu(&leaf->lf_entries, 1);
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001822 leaf->lf_nsec = cpu_to_be32(tv.tv_nsec);
1823 leaf->lf_sec = cpu_to_be64(tv.tv_sec);
Steven Whitehousec7526662006-03-20 12:30:04 -05001824 }
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001825 da->dent = NULL;
1826 da->bh = NULL;
Steven Whitehousec7526662006-03-20 12:30:04 -05001827 brelse(bh);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001828 ip->i_entries++;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001829 ip->i_inode.i_mtime = ip->i_inode.i_ctime = tv;
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001830 if (S_ISDIR(nip->i_inode.i_mode))
1831 inc_nlink(&ip->i_inode);
Bob Peterson343cd8f2012-11-12 13:04:54 -05001832 mark_inode_dirty(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001833 error = 0;
1834 break;
1835 }
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001836 if (!(ip->i_diskflags & GFS2_DIF_EXHASH)) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001837 error = dir_make_exhash(inode);
1838 if (error)
1839 break;
1840 continue;
1841 }
1842 error = dir_split_leaf(inode, name);
1843 if (error == 0)
1844 continue;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001845 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001846 break;
Steven Whitehouse9a004502008-02-01 09:23:44 +00001847 if (ip->i_depth < GFS2_DIR_MAX_DEPTH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001848 error = dir_double_exhash(ip);
1849 if (error)
1850 break;
1851 error = dir_split_leaf(inode, name);
Steven Whitehousee90deff2006-03-29 19:02:15 -05001852 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001853 break;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001854 if (error == 0)
1855 continue;
Steven Whitehousec7526662006-03-20 12:30:04 -05001856 }
1857 error = dir_new_leaf(inode, name);
1858 if (!error)
1859 continue;
1860 error = -ENOSPC;
1861 break;
1862 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001863 return error;
1864}
1865
Steven Whitehousec7526662006-03-20 12:30:04 -05001866
David Teiglandb3b94fa2006-01-16 16:50:04 +00001867/**
1868 * gfs2_dir_del - Delete a directory entry
1869 * @dip: The GFS2 inode
1870 * @filename: The filename
1871 *
1872 * Returns: 0 on success, error code on failure
1873 */
1874
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001875int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001876{
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001877 const struct qstr *name = &dentry->d_name;
Steven Whitehousec7526662006-03-20 12:30:04 -05001878 struct gfs2_dirent *dent, *prev = NULL;
1879 struct buffer_head *bh;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001880 struct timespec tv = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001881
Steven Whitehousec7526662006-03-20 12:30:04 -05001882 /* Returns _either_ the entry (if its first in block) or the
1883 previous entry otherwise */
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001884 dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001885 if (!dent) {
1886 gfs2_consist_inode(dip);
1887 return -EIO;
1888 }
1889 if (IS_ERR(dent)) {
1890 gfs2_consist_inode(dip);
1891 return PTR_ERR(dent);
1892 }
1893 /* If not first in block, adjust pointers accordingly */
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001894 if (gfs2_dirent_find(dent, name, NULL) == 0) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001895 prev = dent;
1896 dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len));
1897 }
1898
1899 dirent_del(dip, bh, prev, dent);
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001900 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001901 struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
1902 u16 entries = be16_to_cpu(leaf->lf_entries);
1903 if (!entries)
1904 gfs2_consist_inode(dip);
1905 leaf->lf_entries = cpu_to_be16(--entries);
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001906 leaf->lf_nsec = cpu_to_be32(tv.tv_nsec);
1907 leaf->lf_sec = cpu_to_be64(tv.tv_sec);
Steven Whitehousec7526662006-03-20 12:30:04 -05001908 }
Steven Whitehouseed386502006-04-07 16:28:07 -04001909 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001910
Steven Whitehousead6203f2008-11-03 13:59:19 +00001911 if (!dip->i_entries)
Steven Whitehousec7526662006-03-20 12:30:04 -05001912 gfs2_consist_inode(dip);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001913 dip->i_entries--;
Steven Whitehouse01bcb0d2014-01-08 12:14:57 +00001914 dip->i_inode.i_mtime = dip->i_inode.i_ctime = tv;
David Howellse36cb0b2015-01-29 12:02:35 +00001915 if (d_is_dir(dentry))
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001916 drop_nlink(&dip->i_inode);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001917 mark_inode_dirty(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001918
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001919 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001920}
1921
David Teiglandb3b94fa2006-01-16 16:50:04 +00001922/**
1923 * gfs2_dir_mvino - Change inode number of directory entry
1924 * @dip: The GFS2 inode
1925 * @filename:
1926 * @new_inode:
1927 *
1928 * This routine changes the inode number of a directory entry. It's used
1929 * by rename to change ".." when a directory is moved.
1930 * Assumes a glock is held on dvp.
1931 *
1932 * Returns: errno
1933 */
1934
Steven Whitehousec7526662006-03-20 12:30:04 -05001935int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001936 const struct gfs2_inode *nip, unsigned int new_type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001937{
Steven Whitehousec7526662006-03-20 12:30:04 -05001938 struct buffer_head *bh;
1939 struct gfs2_dirent *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001940 int error;
1941
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001942 dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001943 if (!dent) {
1944 gfs2_consist_inode(dip);
1945 return -EIO;
1946 }
1947 if (IS_ERR(dent))
1948 return PTR_ERR(dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001949
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001950 gfs2_trans_add_meta(dip->i_gl, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001951 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001952 dent->de_type = cpu_to_be16(new_type);
1953
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001954 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001955 brelse(bh);
1956 error = gfs2_meta_inode_buffer(dip, &bh);
1957 if (error)
1958 return error;
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001959 gfs2_trans_add_meta(dip->i_gl, bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001960 }
1961
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001962 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001963 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001964 brelse(bh);
1965 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001966}
1967
1968/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001969 * leaf_dealloc - Deallocate a directory leaf
1970 * @dip: the directory
1971 * @index: the hash table offset in the directory
1972 * @len: the number of pointers to this leaf
1973 * @leaf_no: the leaf number
Bob Petersonec038c82011-03-22 13:55:23 -04001974 * @leaf_bh: buffer_head for the starting leaf
Bob Petersond24a7a42011-03-22 13:54:03 -04001975 * last_dealloc: 1 if this is the final dealloc for the leaf, else 0
David Teiglandb3b94fa2006-01-16 16:50:04 +00001976 *
1977 * Returns: errno
1978 */
1979
Steven Whitehousecd915492006-09-04 12:49:07 -04001980static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
Bob Petersonec038c82011-03-22 13:55:23 -04001981 u64 leaf_no, struct buffer_head *leaf_bh,
1982 int last_dealloc)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001983{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001984 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001985 struct gfs2_leaf *tmp_leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001986 struct gfs2_rgrp_list rlist;
1987 struct buffer_head *bh, *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001988 u64 blk, nblk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001989 unsigned int rg_blocks = 0, l_blocks = 0;
1990 char *ht;
Steven Whitehousecd915492006-09-04 12:49:07 -04001991 unsigned int x, size = len * sizeof(u64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001992 int error;
1993
Bob Peterson5e2f7d62012-04-04 22:11:16 -04001994 error = gfs2_rindex_update(sdp);
1995 if (error)
1996 return error;
1997
David Teiglandb3b94fa2006-01-16 16:50:04 +00001998 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1999
Joe Perches8be04b92013-06-19 12:15:53 -07002000 ht = kzalloc(size, GFP_NOFS | __GFP_NOWARN);
Bob Petersone8830d82013-05-30 09:48:56 -04002001 if (ht == NULL)
Oleg Drokin7456a372015-02-01 22:59:54 -05002002 ht = __vmalloc(size, GFP_NOFS | __GFP_NOWARN | __GFP_ZERO,
2003 PAGE_KERNEL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002004 if (!ht)
2005 return -ENOMEM;
2006
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08002007 error = gfs2_quota_hold(dip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002008 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04002009 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002010
David Teiglandb3b94fa2006-01-16 16:50:04 +00002011 /* Count the number of leaves */
Bob Petersonec038c82011-03-22 13:55:23 -04002012 bh = leaf_bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002013
Steven Whitehousec7526662006-03-20 12:30:04 -05002014 for (blk = leaf_no; blk; blk = nblk) {
Bob Petersonec038c82011-03-22 13:55:23 -04002015 if (blk != leaf_no) {
2016 error = get_leaf(dip, blk, &bh);
2017 if (error)
2018 goto out_rlist;
2019 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002020 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
2021 nblk = be64_to_cpu(tmp_leaf->lf_next);
Bob Petersonec038c82011-03-22 13:55:23 -04002022 if (blk != leaf_no)
2023 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002024
Steven Whitehouse70b0c362011-09-02 16:08:09 +01002025 gfs2_rlist_add(dip, &rlist, blk);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002026 l_blocks++;
2027 }
2028
Bob Petersonfe6c9912008-01-28 11:13:02 -06002029 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002030
2031 for (x = 0; x < rlist.rl_rgrps; x++) {
2032 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -05002033 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01002034 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002035 }
2036
2037 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
2038 if (error)
2039 goto out_rlist;
2040
2041 error = gfs2_trans_begin(sdp,
Steven Whitehouse5c676f62006-02-27 17:23:27 -05002042 rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) +
David Teiglandb3b94fa2006-01-16 16:50:04 +00002043 RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks);
2044 if (error)
2045 goto out_rg_gunlock;
2046
Bob Petersonec038c82011-03-22 13:55:23 -04002047 bh = leaf_bh;
2048
Steven Whitehousec7526662006-03-20 12:30:04 -05002049 for (blk = leaf_no; blk; blk = nblk) {
Bob Petersonec038c82011-03-22 13:55:23 -04002050 if (blk != leaf_no) {
2051 error = get_leaf(dip, blk, &bh);
2052 if (error)
2053 goto out_end_trans;
2054 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002055 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
2056 nblk = be64_to_cpu(tmp_leaf->lf_next);
Bob Petersonec038c82011-03-22 13:55:23 -04002057 if (blk != leaf_no)
2058 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002059
2060 gfs2_free_meta(dip, blk, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00002061 gfs2_add_inode_blocks(&dip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002062 }
2063
Steven Whitehousecd915492006-09-04 12:49:07 -04002064 error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002065 if (error != size) {
2066 if (error >= 0)
2067 error = -EIO;
2068 goto out_end_trans;
2069 }
2070
2071 error = gfs2_meta_inode_buffer(dip, &dibh);
2072 if (error)
2073 goto out_end_trans;
2074
Steven Whitehouse350a9b02012-12-14 12:36:02 +00002075 gfs2_trans_add_meta(dip->i_gl, dibh);
Bob Petersond24a7a42011-03-22 13:54:03 -04002076 /* On the last dealloc, make this a regular file in case we crash.
2077 (We don't want to free these blocks a second time.) */
2078 if (last_dealloc)
2079 dip->i_inode.i_mode = S_IFREG;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05002080 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002081 brelse(dibh);
2082
Steven Whitehousea91ea692006-09-04 12:04:26 -04002083out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00002084 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04002085out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +00002086 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -04002087out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +00002088 gfs2_rlist_free(&rlist);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002089 gfs2_quota_unhold(dip);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03002090out:
Al Viro3cdcf632014-11-20 05:18:38 +00002091 kvfree(ht);
David Teiglandb3b94fa2006-01-16 16:50:04 +00002092 return error;
2093}
2094
2095/**
2096 * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory
2097 * @dip: the directory
2098 *
2099 * Dealloc all on-disk directory leaves to FREEMETA state
2100 * Change on-disk inode type to "regular file"
2101 *
2102 * Returns: errno
2103 */
2104
2105int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
2106{
Bob Peterson556bb172011-03-22 13:56:37 -04002107 struct buffer_head *bh;
2108 struct gfs2_leaf *leaf;
2109 u32 hsize, len;
Bob Peterson556bb172011-03-22 13:56:37 -04002110 u32 index = 0, next_index;
2111 __be64 *lp;
2112 u64 leaf_no;
2113 int error = 0, last;
2114
2115 hsize = 1 << dip->i_depth;
Bob Peterson556bb172011-03-22 13:56:37 -04002116
Steven Whitehouse17d539f2011-06-15 10:29:37 +01002117 lp = gfs2_dir_get_hash_table(dip);
2118 if (IS_ERR(lp))
2119 return PTR_ERR(lp);
Bob Peterson556bb172011-03-22 13:56:37 -04002120
2121 while (index < hsize) {
Steven Whitehouse17d539f2011-06-15 10:29:37 +01002122 leaf_no = be64_to_cpu(lp[index]);
Bob Peterson556bb172011-03-22 13:56:37 -04002123 if (leaf_no) {
2124 error = get_leaf(dip, leaf_no, &bh);
2125 if (error)
2126 goto out;
2127 leaf = (struct gfs2_leaf *)bh->b_data;
2128 len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
2129
2130 next_index = (index & ~(len - 1)) + len;
2131 last = ((next_index >= hsize) ? 1 : 0);
2132 error = leaf_dealloc(dip, index, len, leaf_no, bh,
2133 last);
2134 brelse(bh);
2135 if (error)
2136 goto out;
2137 index = next_index;
2138 } else
2139 index++;
2140 }
2141
2142 if (index != hsize) {
2143 gfs2_consist_inode(dip);
2144 error = -EIO;
2145 }
2146
2147out:
Bob Peterson556bb172011-03-22 13:56:37 -04002148
2149 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002150}
2151
2152/**
2153 * gfs2_diradd_alloc_required - find if adding entry will require an allocation
2154 * @ip: the file being written to
2155 * @filname: the filename that's going to be added
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002156 * @da: The structure to return dir alloc info
David Teiglandb3b94fa2006-01-16 16:50:04 +00002157 *
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002158 * Returns: 0 if ok, -ve on error
David Teiglandb3b94fa2006-01-16 16:50:04 +00002159 */
2160
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002161int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name,
2162 struct gfs2_diradd *da)
David Teiglandb3b94fa2006-01-16 16:50:04 +00002163{
Steven Whitehouse22b5a6c2014-01-08 11:05:29 +00002164 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002165 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse22b5a6c2014-01-08 11:05:29 +00002166 const unsigned int extra = sizeof(struct gfs2_dinode) - sizeof(struct gfs2_leaf);
Steven Whitehousec7526662006-03-20 12:30:04 -05002167 struct gfs2_dirent *dent;
2168 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002169
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002170 da->nr_blocks = 0;
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00002171 da->bh = NULL;
2172 da->dent = NULL;
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002173
Steven Whitehousec7526662006-03-20 12:30:04 -05002174 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh);
Steven Whitehouseed386502006-04-07 16:28:07 -04002175 if (!dent) {
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002176 da->nr_blocks = sdp->sd_max_dirres;
Steven Whitehouse22b5a6c2014-01-08 11:05:29 +00002177 if (!(ip->i_diskflags & GFS2_DIF_EXHASH) &&
2178 (GFS2_DIRENT_SIZE(name->len) < extra))
2179 da->nr_blocks = 1;
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00002180 return 0;
Steven Whitehouseed386502006-04-07 16:28:07 -04002181 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002182 if (IS_ERR(dent))
2183 return PTR_ERR(dent);
Bob Peterson19aeb5a2014-09-29 08:52:04 -04002184
2185 if (da->save_loc) {
2186 da->bh = bh;
2187 da->dent = dent;
2188 } else {
2189 brelse(bh);
2190 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002191 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002192}
2193