blob: 1cc2f8ec52a2cb76246eaba3ea08efac57bf0eae [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
David Teiglandb3b94fa2006-01-16 16:50:04 +000056#include <linux/slab.h>
57#include <linux/spinlock.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000058#include <linux/buffer_head.h>
59#include <linux/sort.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050060#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050061#include <linux/crc32.h>
Steven Whitehousefe1bded2006-04-18 10:09:15 -040062#include <linux/vmalloc.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000063
64#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050065#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000066#include "dir.h"
67#include "glock.h"
68#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000069#include "meta_io.h"
70#include "quota.h"
71#include "rgrp.h"
72#include "trans.h"
Steven Whitehousee13940b2006-01-30 13:31:50 +000073#include "bmap.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050074#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000075
76#define IS_LEAF 1 /* Hashed (leaf) directory */
77#define IS_DINODE 2 /* Linear (stuffed dinode block) directory */
78
Steven Whitehousecd915492006-09-04 12:49:07 -040079#define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1)
80#define gfs2_dir_offset2hash(p) ((u32)(((u64)(p)) << 1))
David Teiglandb3b94fa2006-01-16 16:50:04 +000081
Steven Whitehouse8d123582010-09-17 12:30:23 +010082struct qstr gfs2_qdot __read_mostly;
83struct qstr gfs2_qdotdot __read_mostly;
84
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040085typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent,
86 const struct qstr *name, void *opaque);
David Teiglandb3b94fa2006-01-16 16:50:04 +000087
Steven Whitehousecd915492006-09-04 12:49:07 -040088int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -040089 struct buffer_head **bhp)
Steven Whitehousee13940b2006-01-30 13:31:50 +000090{
91 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +000092
Steven Whitehouse61e085a2006-04-24 10:07:13 -040093 bh = gfs2_meta_new(ip->i_gl, block);
94 gfs2_trans_add_bh(ip->i_gl, bh, 1);
95 gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD);
96 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
Steven Whitehousee13940b2006-01-30 13:31:50 +000097 *bhp = bh;
98 return 0;
99}
100
Steven Whitehousecd915492006-09-04 12:49:07 -0400101static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400102 struct buffer_head **bhp)
103{
104 struct buffer_head *bh;
105 int error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000106
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400107 error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, &bh);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400108 if (error)
109 return error;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400110 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) {
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400111 brelse(bh);
112 return -EIO;
113 }
114 *bhp = bh;
115 return 0;
116}
Steven Whitehousee13940b2006-01-30 13:31:50 +0000117
118static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf,
119 unsigned int offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000120{
121 struct buffer_head *dibh;
122 int error;
123
124 error = gfs2_meta_inode_buffer(ip, &dibh);
125 if (error)
126 return error;
127
128 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehousec7526662006-03-20 12:30:04 -0500129 memcpy(dibh->b_data + offset + sizeof(struct gfs2_dinode), buf, size);
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100130 if (ip->i_inode.i_size < offset + size)
131 i_size_write(&ip->i_inode, offset + size);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100132 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500133 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000134
135 brelse(dibh);
136
137 return size;
138}
139
140
141
142/**
143 * gfs2_dir_write_data - Write directory information to the inode
144 * @ip: The GFS2 inode
145 * @buf: The buffer containing information to be written
146 * @offset: The file offset to start writing at
147 * @size: The amount of data to write
148 *
149 * Returns: The number of bytes correctly written or error code
150 */
151static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
Steven Whitehousecd915492006-09-04 12:49:07 -0400152 u64 offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000153{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400154 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000155 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400156 u64 lblock, dblock;
157 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000158 unsigned int o;
159 int copied = 0;
160 int error = 0;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000161 int new = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000162
163 if (!size)
164 return 0;
165
166 if (gfs2_is_stuffed(ip) &&
167 offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500168 return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset,
169 size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000170
171 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
172 return -EINVAL;
173
174 if (gfs2_is_stuffed(ip)) {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400175 error = gfs2_unstuff_dinode(ip, NULL);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000176 if (error)
Steven Whitehousec7526662006-03-20 12:30:04 -0500177 return error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000178 }
179
180 lblock = offset;
181 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
182
183 while (copied < size) {
184 unsigned int amount;
185 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000186
187 amount = size - copied;
188 if (amount > sdp->sd_sb.sb_bsize - o)
189 amount = sdp->sd_sb.sb_bsize - o;
190
191 if (!extlen) {
192 new = 1;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400193 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400194 &dblock, &extlen);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000195 if (error)
196 goto fail;
197 error = -EIO;
198 if (gfs2_assert_withdraw(sdp, dblock))
199 goto fail;
200 }
201
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400202 if (amount == sdp->sd_jbsize || new)
203 error = gfs2_dir_get_new_buffer(ip, dblock, &bh);
204 else
205 error = gfs2_dir_get_existing_buffer(ip, dblock, &bh);
206
Steven Whitehousee13940b2006-01-30 13:31:50 +0000207 if (error)
208 goto fail;
209
210 gfs2_trans_add_bh(ip->i_gl, bh, 1);
211 memcpy(bh->b_data + o, buf, amount);
212 brelse(bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000213
Steven Whitehouse899bb262006-08-01 15:28:57 -0400214 buf += amount;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000215 copied += amount;
216 lblock++;
217 dblock++;
218 extlen--;
219
220 o = sizeof(struct gfs2_meta_header);
221 }
222
223out:
224 error = gfs2_meta_inode_buffer(ip, &dibh);
225 if (error)
226 return error;
227
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100228 if (ip->i_inode.i_size < offset + copied)
229 i_size_write(&ip->i_inode, offset + copied);
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100230 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000231
232 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500233 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000234 brelse(dibh);
235
236 return copied;
237fail:
238 if (copied)
239 goto out;
240 return error;
241}
242
243static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, char *buf,
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400244 u64 offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000245{
246 struct buffer_head *dibh;
247 int error;
248
249 error = gfs2_meta_inode_buffer(ip, &dibh);
250 if (!error) {
251 offset += sizeof(struct gfs2_dinode);
252 memcpy(buf, dibh->b_data + offset, size);
253 brelse(dibh);
254 }
255
256 return (error) ? error : size;
257}
258
259
260/**
261 * gfs2_dir_read_data - Read a data from a directory inode
262 * @ip: The GFS2 Inode
263 * @buf: The buffer to place result into
264 * @offset: File offset to begin jdata_readng from
265 * @size: Amount of data to transfer
266 *
267 * Returns: The amount of data actually copied or the error
268 */
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400269static int gfs2_dir_read_data(struct gfs2_inode *ip, char *buf, u64 offset,
270 unsigned int size, unsigned ra)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000271{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400272 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousecd915492006-09-04 12:49:07 -0400273 u64 lblock, dblock;
274 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000275 unsigned int o;
276 int copied = 0;
277 int error = 0;
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100278 u64 disksize = i_size_read(&ip->i_inode);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000279
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100280 if (offset >= disksize)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000281 return 0;
282
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100283 if (offset + size > disksize)
284 size = disksize - offset;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000285
286 if (!size)
287 return 0;
288
289 if (gfs2_is_stuffed(ip))
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400290 return gfs2_dir_read_stuffed(ip, buf, offset, size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000291
292 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
293 return -EINVAL;
294
295 lblock = offset;
296 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
297
298 while (copied < size) {
299 unsigned int amount;
300 struct buffer_head *bh;
301 int new;
302
303 amount = size - copied;
304 if (amount > sdp->sd_sb.sb_bsize - o)
305 amount = sdp->sd_sb.sb_bsize - o;
306
307 if (!extlen) {
308 new = 0;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400309 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400310 &dblock, &extlen);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400311 if (error || !dblock)
312 goto fail;
313 BUG_ON(extlen < 1);
314 if (!ra)
315 extlen = 1;
316 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
Adrian Bunkb7d8ac32006-10-19 16:02:07 +0200317 } else {
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400318 error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, &bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000319 if (error)
320 goto fail;
321 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400322 error = gfs2_metatype_check(sdp, bh, GFS2_METATYPE_JD);
323 if (error) {
324 brelse(bh);
325 goto fail;
326 }
327 dblock++;
328 extlen--;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000329 memcpy(buf, bh->b_data + o, amount);
330 brelse(bh);
Steven Whitehouse899bb262006-08-01 15:28:57 -0400331 buf += amount;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000332 copied += amount;
333 lblock++;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000334 o = sizeof(struct gfs2_meta_header);
335 }
336
337 return copied;
338fail:
339 return (copied) ? copied : error;
340}
341
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100342/**
343 * gfs2_dir_get_hash_table - Get pointer to the dir hash table
344 * @ip: The inode in question
345 *
346 * Returns: The hash table or an error
347 */
348
349static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
350{
351 struct inode *inode = &ip->i_inode;
352 int ret;
353 u32 hsize;
354 __be64 *hc;
355
356 BUG_ON(!(ip->i_diskflags & GFS2_DIF_EXHASH));
357
358 hc = ip->i_hash_cache;
359 if (hc)
360 return hc;
361
362 hsize = 1 << ip->i_depth;
363 hsize *= sizeof(__be64);
364 if (hsize != i_size_read(&ip->i_inode)) {
365 gfs2_consist_inode(ip);
366 return ERR_PTR(-EIO);
367 }
368
369 hc = kmalloc(hsize, GFP_NOFS);
370 ret = -ENOMEM;
371 if (hc == NULL)
372 return ERR_PTR(-ENOMEM);
373
374 ret = gfs2_dir_read_data(ip, (char *)hc, 0, hsize, 1);
375 if (ret < 0) {
376 kfree(hc);
377 return ERR_PTR(ret);
378 }
379
380 spin_lock(&inode->i_lock);
381 if (ip->i_hash_cache)
382 kfree(hc);
383 else
384 ip->i_hash_cache = hc;
385 spin_unlock(&inode->i_lock);
386
387 return ip->i_hash_cache;
388}
389
390/**
391 * gfs2_dir_hash_inval - Invalidate dir hash
392 * @ip: The directory inode
393 *
394 * Must be called with an exclusive glock, or during glock invalidation.
395 */
396void gfs2_dir_hash_inval(struct gfs2_inode *ip)
397{
398 __be64 *hc = ip->i_hash_cache;
399 ip->i_hash_cache = NULL;
400 kfree(hc);
401}
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
448static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500449 const struct qstr *name,
450 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500451{
452 unsigned required = GFS2_DIRENT_SIZE(name->len);
453 unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
454 unsigned totlen = be16_to_cpu(dent->de_rec_len);
455
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500456 if (gfs2_dirent_sentinel(dent))
Bob Peterson728a7562010-07-14 18:12:26 -0400457 actual = 0;
Jan Engelhardtc5392122006-09-05 14:30:40 +0200458 if (totlen - actual >= required)
Steven Whitehousec7526662006-03-20 12:30:04 -0500459 return 1;
460 return 0;
461}
462
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500463struct dirent_gather {
464 const struct gfs2_dirent **pdent;
465 unsigned offset;
466};
467
468static int gfs2_dirent_gather(const struct gfs2_dirent *dent,
469 const struct qstr *name,
470 void *opaque)
471{
472 struct dirent_gather *g = opaque;
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500473 if (!gfs2_dirent_sentinel(dent)) {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500474 g->pdent[g->offset++] = dent;
475 }
476 return 0;
477}
478
Steven Whitehousec7526662006-03-20 12:30:04 -0500479/*
480 * Other possible things to check:
481 * - Inode located within filesystem size (and on valid block)
482 * - Valid directory entry type
483 * Not sure how heavy-weight we want to make this... could also check
484 * hash is correct for example, but that would take a lot of extra time.
485 * For now the most important thing is to check that the various sizes
486 * are correct.
487 */
488static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset,
489 unsigned int size, unsigned int len, int first)
490{
491 const char *msg = "gfs2_dirent too small";
492 if (unlikely(size < sizeof(struct gfs2_dirent)))
493 goto error;
494 msg = "gfs2_dirent misaligned";
495 if (unlikely(offset & 0x7))
496 goto error;
497 msg = "gfs2_dirent points beyond end of block";
498 if (unlikely(offset + size > len))
499 goto error;
500 msg = "zero inode number";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500501 if (unlikely(!first && gfs2_dirent_sentinel(dent)))
Steven Whitehousec7526662006-03-20 12:30:04 -0500502 goto error;
503 msg = "name length is greater than space in dirent";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500504 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500505 unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) >
506 size))
507 goto error;
508 return 0;
509error:
510 printk(KERN_WARNING "gfs2_check_dirent: %s (%s)\n", msg,
511 first ? "first in block" : "not first in block");
512 return -EIO;
513}
514
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500515static int gfs2_dirent_offset(const void *buf)
Steven Whitehousec7526662006-03-20 12:30:04 -0500516{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500517 const struct gfs2_meta_header *h = buf;
518 int offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500519
520 BUG_ON(buf == NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500521
Steven Whitehousee3167de2006-03-30 15:46:23 -0500522 switch(be32_to_cpu(h->mh_type)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500523 case GFS2_METATYPE_LF:
524 offset = sizeof(struct gfs2_leaf);
525 break;
526 case GFS2_METATYPE_DI:
527 offset = sizeof(struct gfs2_dinode);
528 break;
529 default:
530 goto wrong_type;
531 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500532 return offset;
533wrong_type:
534 printk(KERN_WARNING "gfs2_scan_dirent: wrong block type %u\n",
Steven Whitehousee3167de2006-03-30 15:46:23 -0500535 be32_to_cpu(h->mh_type));
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500536 return -1;
537}
Steven Whitehousec7526662006-03-20 12:30:04 -0500538
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400539static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500540 unsigned int len, gfs2_dscan_t scan,
541 const struct qstr *name,
542 void *opaque)
543{
544 struct gfs2_dirent *dent, *prev;
545 unsigned offset;
546 unsigned size;
547 int ret = 0;
548
549 ret = gfs2_dirent_offset(buf);
550 if (ret < 0)
551 goto consist_inode;
552
553 offset = ret;
Steven Whitehousec7526662006-03-20 12:30:04 -0500554 prev = NULL;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400555 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500556 size = be16_to_cpu(dent->de_rec_len);
557 if (gfs2_check_dirent(dent, offset, size, len, 1))
558 goto consist_inode;
559 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500560 ret = scan(dent, name, opaque);
Steven Whitehousec7526662006-03-20 12:30:04 -0500561 if (ret)
562 break;
563 offset += size;
564 if (offset == len)
565 break;
566 prev = dent;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400567 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500568 size = be16_to_cpu(dent->de_rec_len);
569 if (gfs2_check_dirent(dent, offset, size, len, 0))
570 goto consist_inode;
571 } while(1);
572
573 switch(ret) {
574 case 0:
575 return NULL;
576 case 1:
577 return dent;
578 case 2:
579 return prev ? prev : dent;
580 default:
581 BUG_ON(ret > 0);
582 return ERR_PTR(ret);
583 }
584
Steven Whitehousec7526662006-03-20 12:30:04 -0500585consist_inode:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400586 gfs2_consist_inode(GFS2_I(inode));
Steven Whitehousec7526662006-03-20 12:30:04 -0500587 return ERR_PTR(-EIO);
588}
589
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400590static int dirent_check_reclen(struct gfs2_inode *dip,
591 const struct gfs2_dirent *d, const void *end_p)
592{
593 const void *ptr = d;
594 u16 rec_len = be16_to_cpu(d->de_rec_len);
595
596 if (unlikely(rec_len < sizeof(struct gfs2_dirent)))
597 goto broken;
598 ptr += rec_len;
599 if (ptr < end_p)
600 return rec_len;
601 if (ptr == end_p)
602 return -ENOENT;
603broken:
604 gfs2_consist_inode(dip);
605 return -EIO;
606}
607
David Teiglandb3b94fa2006-01-16 16:50:04 +0000608/**
609 * dirent_next - Next dirent
610 * @dip: the directory
611 * @bh: The buffer
612 * @dent: Pointer to list of dirents
613 *
614 * Returns: 0 on success, error code otherwise
615 */
616
617static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
618 struct gfs2_dirent **dent)
619{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400620 struct gfs2_dirent *cur = *dent, *tmp;
621 char *bh_end = bh->b_data + bh->b_size;
622 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000623
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400624 ret = dirent_check_reclen(dip, cur, bh_end);
625 if (ret < 0)
626 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000627
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400628 tmp = (void *)cur + ret;
629 ret = dirent_check_reclen(dip, tmp, bh_end);
630 if (ret == -EIO)
631 return ret;
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000632
David Teiglandb3b94fa2006-01-16 16:50:04 +0000633 /* Only the first dent could ever have de_inum.no_addr == 0 */
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500634 if (gfs2_dirent_sentinel(tmp)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000635 gfs2_consist_inode(dip);
636 return -EIO;
637 }
638
639 *dent = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000640 return 0;
641}
642
643/**
644 * dirent_del - Delete a dirent
645 * @dip: The GFS2 inode
646 * @bh: The buffer
647 * @prev: The previous dirent
648 * @cur: The current dirent
649 *
650 */
651
652static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
653 struct gfs2_dirent *prev, struct gfs2_dirent *cur)
654{
Steven Whitehousecd915492006-09-04 12:49:07 -0400655 u16 cur_rec_len, prev_rec_len;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000656
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500657 if (gfs2_dirent_sentinel(cur)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000658 gfs2_consist_inode(dip);
659 return;
660 }
661
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000662 gfs2_trans_add_bh(dip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000663
664 /* If there is no prev entry, this is the first entry in the block.
665 The de_rec_len is already as big as it needs to be. Just zero
666 out the inode number and return. */
667
668 if (!prev) {
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500669 cur->de_inum.no_addr = 0;
670 cur->de_inum.no_formal_ino = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000671 return;
672 }
673
674 /* Combine this dentry with the previous one. */
675
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000676 prev_rec_len = be16_to_cpu(prev->de_rec_len);
677 cur_rec_len = be16_to_cpu(cur->de_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000678
679 if ((char *)prev + prev_rec_len != (char *)cur)
680 gfs2_consist_inode(dip);
681 if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size)
682 gfs2_consist_inode(dip);
683
684 prev_rec_len += cur_rec_len;
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000685 prev->de_rec_len = cpu_to_be16(prev_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000686}
687
Steven Whitehousec7526662006-03-20 12:30:04 -0500688/*
689 * Takes a dent from which to grab space as an argument. Returns the
690 * newly created dent.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000691 */
Adrian Bunk08bc2db2006-04-28 10:59:12 -0400692static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
693 struct gfs2_dirent *dent,
694 const struct qstr *name,
695 struct buffer_head *bh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400697 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -0500698 struct gfs2_dirent *ndent;
699 unsigned offset = 0, totlen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000700
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500701 if (!gfs2_dirent_sentinel(dent))
Steven Whitehousec7526662006-03-20 12:30:04 -0500702 offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
703 totlen = be16_to_cpu(dent->de_rec_len);
704 BUG_ON(offset + name->len > totlen);
705 gfs2_trans_add_bh(ip->i_gl, bh, 1);
706 ndent = (struct gfs2_dirent *)((char *)dent + offset);
707 dent->de_rec_len = cpu_to_be16(offset);
708 gfs2_qstr2dirent(name, totlen - offset, ndent);
709 return ndent;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000710}
711
Steven Whitehousec7526662006-03-20 12:30:04 -0500712static struct gfs2_dirent *gfs2_dirent_alloc(struct inode *inode,
713 struct buffer_head *bh,
714 const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000715{
716 struct gfs2_dirent *dent;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400717 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500718 gfs2_dirent_find_space, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500719 if (!dent || IS_ERR(dent))
720 return dent;
721 return gfs2_init_dirent(inode, dent, name, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000722}
723
Steven Whitehousecd915492006-09-04 12:49:07 -0400724static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000725 struct buffer_head **bhp)
726{
727 int error;
728
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400729 error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, bhp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400730 if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
731 /* printk(KERN_INFO "block num=%llu\n", leaf_no); */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000732 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400733 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000734
735 return error;
736}
737
738/**
739 * get_leaf_nr - Get a leaf number associated with the index
740 * @dip: The GFS2 inode
741 * @index:
742 * @leaf_out:
743 *
744 * Returns: 0 on success, error code otherwise
745 */
746
Steven Whitehousecd915492006-09-04 12:49:07 -0400747static int get_leaf_nr(struct gfs2_inode *dip, u32 index,
748 u64 *leaf_out)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000749{
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100750 __be64 *hash;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000751
Steven Whitehouse17d539f2011-06-15 10:29:37 +0100752 hash = gfs2_dir_get_hash_table(dip);
753 if (IS_ERR(hash))
754 return PTR_ERR(hash);
755 *leaf_out = be64_to_cpu(*(hash + index));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000756 return 0;
757}
758
Steven Whitehousecd915492006-09-04 12:49:07 -0400759static int get_first_leaf(struct gfs2_inode *dip, u32 index,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000760 struct buffer_head **bh_out)
761{
Steven Whitehousecd915492006-09-04 12:49:07 -0400762 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000763 int error;
764
765 error = get_leaf_nr(dip, index, &leaf_no);
766 if (!error)
767 error = get_leaf(dip, leaf_no, bh_out);
768
769 return error;
770}
771
Steven Whitehousec7526662006-03-20 12:30:04 -0500772static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
773 const struct qstr *name,
774 gfs2_dscan_t scan,
775 struct buffer_head **pbh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000776{
Steven Whitehousec7526662006-03-20 12:30:04 -0500777 struct buffer_head *bh;
778 struct gfs2_dirent *dent;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400779 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000780 int error;
781
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000782 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500783 struct gfs2_leaf *leaf;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000784 unsigned hsize = 1 << ip->i_depth;
Steven Whitehousec7526662006-03-20 12:30:04 -0500785 unsigned index;
786 u64 ln;
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100787 if (hsize * sizeof(u64) != i_size_read(inode)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500788 gfs2_consist_inode(ip);
789 return ERR_PTR(-EIO);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000790 }
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400791
Steven Whitehouse9a004502008-02-01 09:23:44 +0000792 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500793 error = get_first_leaf(ip, index, &bh);
794 if (error)
795 return ERR_PTR(error);
796 do {
797 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500798 scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500799 if (dent)
800 goto got_dent;
801 leaf = (struct gfs2_leaf *)bh->b_data;
802 ln = be64_to_cpu(leaf->lf_next);
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400803 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500804 if (!ln)
805 break;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400806
Steven Whitehousec7526662006-03-20 12:30:04 -0500807 error = get_leaf(ip, ln, &bh);
808 } while(!error);
809
810 return error ? ERR_PTR(error) : NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000811 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000812
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400813
Steven Whitehousec7526662006-03-20 12:30:04 -0500814 error = gfs2_meta_inode_buffer(ip, &bh);
815 if (error)
816 return ERR_PTR(error);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500817 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500818got_dent:
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400819 if (unlikely(dent == NULL || IS_ERR(dent))) {
Steven Whitehouseed386502006-04-07 16:28:07 -0400820 brelse(bh);
821 bh = NULL;
822 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500823 *pbh = bh;
824 return dent;
825}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000826
Steven Whitehousec7526662006-03-20 12:30:04 -0500827static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth)
828{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400829 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000830 unsigned int n = 1;
Steven Whitehouse09010972009-05-20 10:48:47 +0100831 u64 bn;
832 int error;
833 struct buffer_head *bh;
Steven Whitehousec7526662006-03-20 12:30:04 -0500834 struct gfs2_leaf *leaf;
835 struct gfs2_dirent *dent;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500836 struct qstr name = { .name = "", .len = 0, .hash = 0 };
Steven Whitehouse09010972009-05-20 10:48:47 +0100837
838 error = gfs2_alloc_block(ip, &bn, &n);
839 if (error)
840 return NULL;
841 bh = gfs2_meta_new(ip->i_gl, bn);
Steven Whitehousec7526662006-03-20 12:30:04 -0500842 if (!bh)
843 return NULL;
Steven Whitehouse09010972009-05-20 10:48:47 +0100844
Steven Whitehouse5731be52008-02-01 13:16:55 +0000845 gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
Steven Whitehousec7526662006-03-20 12:30:04 -0500846 gfs2_trans_add_bh(ip->i_gl, bh, 1);
847 gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
848 leaf = (struct gfs2_leaf *)bh->b_data;
849 leaf->lf_depth = cpu_to_be16(depth);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400850 leaf->lf_entries = 0;
Al Viroa2d7d022006-10-14 16:49:30 +0100851 leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400852 leaf->lf_next = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500853 memset(leaf->lf_reserved, 0, sizeof(leaf->lf_reserved));
854 dent = (struct gfs2_dirent *)(leaf+1);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500855 gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent);
Steven Whitehousec7526662006-03-20 12:30:04 -0500856 *pbh = bh;
857 return leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000858}
859
860/**
861 * dir_make_exhash - Convert a stuffed directory into an ExHash directory
862 * @dip: The GFS2 inode
863 *
864 * Returns: 0 on success, error code otherwise
865 */
866
Steven Whitehousec7526662006-03-20 12:30:04 -0500867static int dir_make_exhash(struct inode *inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000868{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400869 struct gfs2_inode *dip = GFS2_I(inode);
870 struct gfs2_sbd *sdp = GFS2_SB(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000871 struct gfs2_dirent *dent;
Steven Whitehousec7526662006-03-20 12:30:04 -0500872 struct qstr args;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000873 struct buffer_head *bh, *dibh;
874 struct gfs2_leaf *leaf;
875 int y;
Steven Whitehousecd915492006-09-04 12:49:07 -0400876 u32 x;
Al Virob44b84d2006-10-14 10:46:30 -0400877 __be64 *lp;
878 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000879 int error;
880
881 error = gfs2_meta_inode_buffer(dip, &dibh);
882 if (error)
883 return error;
884
David Teiglandb3b94fa2006-01-16 16:50:04 +0000885 /* Turn over a new leaf */
886
Steven Whitehousec7526662006-03-20 12:30:04 -0500887 leaf = new_leaf(inode, &bh, 0);
888 if (!leaf)
889 return -ENOSPC;
890 bn = bh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000891
Steven Whitehousead6203f2008-11-03 13:59:19 +0000892 gfs2_assert(sdp, dip->i_entries < (1 << 16));
893 leaf->lf_entries = cpu_to_be16(dip->i_entries);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000894
895 /* Copy dirents */
896
897 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh,
898 sizeof(struct gfs2_dinode));
899
900 /* Find last entry */
901
902 x = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500903 args.len = bh->b_size - sizeof(struct gfs2_dinode) +
904 sizeof(struct gfs2_leaf);
905 args.name = bh->b_data;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400906 dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500907 gfs2_dirent_last, &args, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500908 if (!dent) {
909 brelse(bh);
910 brelse(dibh);
911 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000912 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500913 if (IS_ERR(dent)) {
914 brelse(bh);
915 brelse(dibh);
916 return PTR_ERR(dent);
917 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000918
919 /* Adjust the last dirent's record length
920 (Remember that dent still points to the last entry.) */
921
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000922 dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) +
David Teiglandb3b94fa2006-01-16 16:50:04 +0000923 sizeof(struct gfs2_dinode) -
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000924 sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000925
926 brelse(bh);
927
928 /* We're done with the new leaf block, now setup the new
929 hash table. */
930
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000931 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000932 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
933
Al Virob44b84d2006-10-14 10:46:30 -0400934 lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000935
936 for (x = sdp->sd_hash_ptrs; x--; lp++)
937 *lp = cpu_to_be64(bn);
938
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100939 i_size_write(inode, sdp->sd_sb.sb_bsize / 2);
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000940 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000941 dip->i_diskflags |= GFS2_DIF_EXHASH;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000942
943 for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000944 dip->i_depth = y;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000945
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500946 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000947
948 brelse(dibh);
949
950 return 0;
951}
952
953/**
954 * dir_split_leaf - Split a leaf block into two
955 * @dip: The GFS2 inode
956 * @index:
957 * @leaf_no:
958 *
959 * Returns: 0 on success, error code on failure
960 */
961
Steven Whitehousec7526662006-03-20 12:30:04 -0500962static int dir_split_leaf(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000963{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400964 struct gfs2_inode *dip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000965 struct buffer_head *nbh, *obh, *dibh;
966 struct gfs2_leaf *nleaf, *oleaf;
Steven Whitehouse4da3c642006-07-11 13:19:13 -0400967 struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new;
Steven Whitehousecd915492006-09-04 12:49:07 -0400968 u32 start, len, half_len, divider;
Al Virob44b84d2006-10-14 10:46:30 -0400969 u64 bn, leaf_no;
970 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -0400971 u32 index;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000972 int x, moved = 0;
973 int error;
974
Steven Whitehouse9a004502008-02-01 09:23:44 +0000975 index = name->hash >> (32 - dip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500976 error = get_leaf_nr(dip, index, &leaf_no);
977 if (error)
978 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000979
980 /* Get the old leaf block */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000981 error = get_leaf(dip, leaf_no, &obh);
982 if (error)
Steven Whitehousee90deff2006-03-29 19:02:15 -0500983 return error;
984
985 oleaf = (struct gfs2_leaf *)obh->b_data;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000986 if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) {
Steven Whitehousee90deff2006-03-29 19:02:15 -0500987 brelse(obh);
988 return 1; /* can't split */
989 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000990
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000991 gfs2_trans_add_bh(dip->i_gl, obh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000992
Steven Whitehousec7526662006-03-20 12:30:04 -0500993 nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1);
994 if (!nleaf) {
995 brelse(obh);
996 return -ENOSPC;
997 }
998 bn = nbh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000999
Steven Whitehousec7526662006-03-20 12:30:04 -05001000 /* Compute the start and len of leaf pointers in the hash table. */
Steven Whitehouse9a004502008-02-01 09:23:44 +00001001 len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001002 half_len = len >> 1;
1003 if (!half_len) {
Steven Whitehouse9a004502008-02-01 09:23:44 +00001004 printk(KERN_WARNING "i_depth %u lf_depth %u index %u\n", dip->i_depth, be16_to_cpu(oleaf->lf_depth), index);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001005 gfs2_consist_inode(dip);
1006 error = -EIO;
1007 goto fail_brelse;
1008 }
1009
1010 start = (index & ~(len - 1));
1011
1012 /* Change the pointers.
1013 Don't bother distinguishing stuffed from non-stuffed.
1014 This code is complicated enough already. */
David Rientjes4244b522010-07-20 19:45:03 -07001015 lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS);
1016 if (!lp) {
1017 error = -ENOMEM;
1018 goto fail_brelse;
1019 }
1020
David Teiglandb3b94fa2006-01-16 16:50:04 +00001021 /* Change the pointers */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001022 for (x = 0; x < half_len; x++)
1023 lp[x] = cpu_to_be64(bn);
1024
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001025 gfs2_dir_hash_inval(dip);
1026
Steven Whitehousecd915492006-09-04 12:49:07 -04001027 error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64),
1028 half_len * sizeof(u64));
1029 if (error != half_len * sizeof(u64)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001030 if (error >= 0)
1031 error = -EIO;
1032 goto fail_lpfree;
1033 }
1034
1035 kfree(lp);
1036
1037 /* Compute the divider */
Steven Whitehouse9a004502008-02-01 09:23:44 +00001038 divider = (start + half_len) << (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001039
1040 /* Copy the entries */
Steven Whitehouse15793432009-11-06 11:06:37 +00001041 dent = (struct gfs2_dirent *)(obh->b_data + sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001042
1043 do {
1044 next = dent;
1045 if (dirent_next(dip, obh, &next))
1046 next = NULL;
1047
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -05001048 if (!gfs2_dirent_sentinel(dent) &&
David Teiglandb3b94fa2006-01-16 16:50:04 +00001049 be32_to_cpu(dent->de_hash) < divider) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001050 struct qstr str;
1051 str.name = (char*)(dent+1);
1052 str.len = be16_to_cpu(dent->de_name_len);
1053 str.hash = be32_to_cpu(dent->de_hash);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001054 new = gfs2_dirent_alloc(inode, nbh, &str);
Steven Whitehousec7526662006-03-20 12:30:04 -05001055 if (IS_ERR(new)) {
1056 error = PTR_ERR(new);
1057 break;
1058 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001059
1060 new->de_inum = dent->de_inum; /* No endian worries */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001061 new->de_type = dent->de_type; /* No endian worries */
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001062 be16_add_cpu(&nleaf->lf_entries, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001063
1064 dirent_del(dip, obh, prev, dent);
1065
1066 if (!oleaf->lf_entries)
1067 gfs2_consist_inode(dip);
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001068 be16_add_cpu(&oleaf->lf_entries, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001069
1070 if (!prev)
1071 prev = dent;
1072
1073 moved = 1;
Steven Whitehousec7526662006-03-20 12:30:04 -05001074 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001075 prev = dent;
Steven Whitehousec7526662006-03-20 12:30:04 -05001076 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077 dent = next;
Steven Whitehousec7526662006-03-20 12:30:04 -05001078 } while (dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001079
Steven Whitehousec7526662006-03-20 12:30:04 -05001080 oleaf->lf_depth = nleaf->lf_depth;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001081
1082 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001083 if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) {
Steven Whitehouse382e6e22007-08-16 17:08:20 +01001084 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001085 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001086 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001087 brelse(dibh);
1088 }
1089
1090 brelse(obh);
1091 brelse(nbh);
1092
1093 return error;
1094
Steven Whitehousee90deff2006-03-29 19:02:15 -05001095fail_lpfree:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001096 kfree(lp);
1097
Steven Whitehousee90deff2006-03-29 19:02:15 -05001098fail_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001099 brelse(obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001100 brelse(nbh);
1101 return error;
1102}
1103
1104/**
1105 * dir_double_exhash - Double size of ExHash table
1106 * @dip: The GFS2 dinode
1107 *
1108 * Returns: 0 on success, error code on failure
1109 */
1110
1111static int dir_double_exhash(struct gfs2_inode *dip)
1112{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001113 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001114 u32 hsize;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001115 u32 hsize_bytes;
1116 __be64 *hc;
1117 __be64 *hc2, *h;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001118 int x;
1119 int error = 0;
1120
Steven Whitehouse9a004502008-02-01 09:23:44 +00001121 hsize = 1 << dip->i_depth;
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001122 hsize_bytes = hsize * sizeof(__be64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001123
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001124 hc = gfs2_dir_get_hash_table(dip);
1125 if (IS_ERR(hc))
1126 return PTR_ERR(hc);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001127
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001128 h = hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS);
1129 if (!hc2)
David Rientjes4244b522010-07-20 19:45:03 -07001130 return -ENOMEM;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001131
David Teiglandb3b94fa2006-01-16 16:50:04 +00001132 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001133 if (error)
1134 goto out_kfree;
1135
1136 for (x = 0; x < hsize; x++) {
1137 *h++ = *hc;
1138 *h++ = *hc;
1139 hc++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001140 }
1141
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001142 error = gfs2_dir_write_data(dip, (char *)hc2, 0, hsize_bytes * 2);
1143 if (error != (hsize_bytes * 2))
1144 goto fail;
1145
1146 gfs2_dir_hash_inval(dip);
1147 dip->i_hash_cache = hc2;
1148 dip->i_depth++;
1149 gfs2_dinode_out(dip, dibh->b_data);
1150 brelse(dibh);
1151 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001152
Steven Whitehousea91ea692006-09-04 12:04:26 -04001153fail:
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001154 /* Replace original hash table & size */
1155 gfs2_dir_write_data(dip, (char *)hc, 0, hsize_bytes);
1156 i_size_write(&dip->i_inode, hsize_bytes);
1157 gfs2_dinode_out(dip, dibh->b_data);
1158 brelse(dibh);
1159out_kfree:
1160 kfree(hc2);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001161 return error;
1162}
1163
1164/**
1165 * compare_dents - compare directory entries by hash value
1166 * @a: first dent
1167 * @b: second dent
1168 *
1169 * When comparing the hash entries of @a to @b:
1170 * gt: returns 1
1171 * lt: returns -1
1172 * eq: returns 0
1173 */
1174
1175static int compare_dents(const void *a, const void *b)
1176{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001177 const struct gfs2_dirent *dent_a, *dent_b;
Steven Whitehousecd915492006-09-04 12:49:07 -04001178 u32 hash_a, hash_b;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001179 int ret = 0;
1180
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001181 dent_a = *(const struct gfs2_dirent **)a;
Steven Whitehousec7526662006-03-20 12:30:04 -05001182 hash_a = be32_to_cpu(dent_a->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001183
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001184 dent_b = *(const struct gfs2_dirent **)b;
Steven Whitehousec7526662006-03-20 12:30:04 -05001185 hash_b = be32_to_cpu(dent_b->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001186
1187 if (hash_a > hash_b)
1188 ret = 1;
1189 else if (hash_a < hash_b)
1190 ret = -1;
1191 else {
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001192 unsigned int len_a = be16_to_cpu(dent_a->de_name_len);
1193 unsigned int len_b = be16_to_cpu(dent_b->de_name_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001194
1195 if (len_a > len_b)
1196 ret = 1;
1197 else if (len_a < len_b)
1198 ret = -1;
1199 else
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001200 ret = memcmp(dent_a + 1, dent_b + 1, len_a);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001201 }
1202
1203 return ret;
1204}
1205
1206/**
1207 * do_filldir_main - read out directory entries
1208 * @dip: The GFS2 inode
1209 * @offset: The offset in the file to read from
1210 * @opaque: opaque data to pass to filldir
1211 * @filldir: The function to pass entries to
1212 * @darr: an array of struct gfs2_dirent pointers to read
1213 * @entries: the number of entries in darr
1214 * @copied: pointer to int that's non-zero if a entry has been copied out
1215 *
1216 * Jump through some hoops to make sure that if there are hash collsions,
1217 * they are read out at the beginning of a buffer. We want to minimize
1218 * the possibility that they will fall into different readdir buffers or
1219 * that someone will want to seek to that location.
1220 *
1221 * Returns: errno, >0 on exception from filldir
1222 */
1223
Steven Whitehousecd915492006-09-04 12:49:07 -04001224static int do_filldir_main(struct gfs2_inode *dip, u64 *offset,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001225 void *opaque, filldir_t filldir,
Steven Whitehousecd915492006-09-04 12:49:07 -04001226 const struct gfs2_dirent **darr, u32 entries,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001227 int *copied)
1228{
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001229 const struct gfs2_dirent *dent, *dent_next;
Steven Whitehousecd915492006-09-04 12:49:07 -04001230 u64 off, off_next;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001231 unsigned int x, y;
1232 int run = 0;
1233 int error = 0;
1234
1235 sort(darr, entries, sizeof(struct gfs2_dirent *), compare_dents, NULL);
1236
1237 dent_next = darr[0];
1238 off_next = be32_to_cpu(dent_next->de_hash);
1239 off_next = gfs2_disk_hash2offset(off_next);
1240
1241 for (x = 0, y = 1; x < entries; x++, y++) {
1242 dent = dent_next;
1243 off = off_next;
1244
1245 if (y < entries) {
1246 dent_next = darr[y];
1247 off_next = be32_to_cpu(dent_next->de_hash);
1248 off_next = gfs2_disk_hash2offset(off_next);
1249
1250 if (off < *offset)
1251 continue;
1252 *offset = off;
1253
1254 if (off_next == off) {
1255 if (*copied && !run)
1256 return 1;
1257 run = 1;
1258 } else
1259 run = 0;
1260 } else {
1261 if (off < *offset)
1262 continue;
1263 *offset = off;
1264 }
1265
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001266 error = filldir(opaque, (const char *)(dent + 1),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001267 be16_to_cpu(dent->de_name_len),
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001268 off, be64_to_cpu(dent->de_inum.no_addr),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001269 be16_to_cpu(dent->de_type));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001270 if (error)
1271 return 1;
1272
1273 *copied = 1;
1274 }
1275
1276 /* Increment the *offset by one, so the next time we come into the
1277 do_filldir fxn, we get the next entry instead of the last one in the
1278 current leaf */
1279
1280 (*offset)++;
1281
1282 return 0;
1283}
1284
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001285static void *gfs2_alloc_sort_buffer(unsigned size)
1286{
1287 void *ptr = NULL;
1288
1289 if (size < KMALLOC_MAX_SIZE)
1290 ptr = kmalloc(size, GFP_NOFS | __GFP_NOWARN);
1291 if (!ptr)
1292 ptr = __vmalloc(size, GFP_NOFS, PAGE_KERNEL);
1293 return ptr;
1294}
1295
1296static void gfs2_free_sort_buffer(void *ptr)
1297{
1298 if (is_vmalloc_addr(ptr))
1299 vfree(ptr);
1300 else
1301 kfree(ptr);
1302}
1303
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001304static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001305 filldir_t filldir, int *copied, unsigned *depth,
1306 u64 leaf_no)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001307{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001308 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001309 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001310 struct buffer_head *bh;
1311 struct gfs2_leaf *lf;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001312 unsigned entries = 0, entries2 = 0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001313 unsigned leaves = 0;
1314 const struct gfs2_dirent **darr, *dent;
1315 struct dirent_gather g;
1316 struct buffer_head **larr;
1317 int leaf = 0;
1318 int error, i;
1319 u64 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001320
David Teiglandb3b94fa2006-01-16 16:50:04 +00001321 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001322 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001323 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001324 goto out;
1325 lf = (struct gfs2_leaf *)bh->b_data;
1326 if (leaves == 0)
1327 *depth = be16_to_cpu(lf->lf_depth);
1328 entries += be16_to_cpu(lf->lf_entries);
1329 leaves++;
1330 lfn = be64_to_cpu(lf->lf_next);
1331 brelse(bh);
1332 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001333
1334 if (!entries)
1335 return 0;
1336
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001337 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001338 /*
1339 * The extra 99 entries are not normally used, but are a buffer
1340 * zone in case the number of entries in the leaf is corrupt.
1341 * 99 is the maximum number of entries that can fit in a single
1342 * leaf block.
1343 */
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001344 larr = gfs2_alloc_sort_buffer((leaves + entries + 99) * sizeof(void *));
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001345 if (!larr)
1346 goto out;
1347 darr = (const struct gfs2_dirent **)(larr + leaves);
1348 g.pdent = darr;
1349 g.offset = 0;
1350 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001351
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001352 do {
1353 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001354 if (error)
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001355 goto out_free;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001356 lf = (struct gfs2_leaf *)bh->b_data;
1357 lfn = be64_to_cpu(lf->lf_next);
1358 if (lf->lf_entries) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001359 entries2 += be16_to_cpu(lf->lf_entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001360 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
1361 gfs2_dirent_gather, NULL, &g);
1362 error = PTR_ERR(dent);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001363 if (IS_ERR(dent))
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001364 goto out_free;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001365 if (entries2 != g.offset) {
akpm@linux-foundation.orgf391a4e2007-04-25 21:08:02 -07001366 fs_warn(sdp, "Number of entries corrupt in dir "
1367 "leaf %llu, entries2 (%u) != "
1368 "g.offset (%u)\n",
1369 (unsigned long long)bh->b_blocknr,
1370 entries2, g.offset);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001371
1372 error = -EIO;
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001373 goto out_free;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001374 }
1375 error = 0;
1376 larr[leaf++] = bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001377 } else {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001378 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001379 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001380 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001381
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001382 BUG_ON(entries2 != entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001383 error = do_filldir_main(ip, offset, opaque, filldir, darr,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001384 entries, copied);
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001385out_free:
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001386 for(i = 0; i < leaf; i++)
1387 brelse(larr[i]);
Steven Whitehoused2a97a42010-07-28 17:56:23 +01001388 gfs2_free_sort_buffer(larr);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001389out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001390 return error;
1391}
1392
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001393
David Teiglandb3b94fa2006-01-16 16:50:04 +00001394/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001395 * dir_e_read - Reads the entries from a directory into a filldir buffer
1396 * @dip: dinode pointer
1397 * @offset: the hash of the last entry read shifted to the right once
1398 * @opaque: buffer for the filldir function to fill
1399 * @filldir: points to the filldir function to use
1400 *
1401 * Returns: errno
1402 */
1403
Steven Whitehousecd915492006-09-04 12:49:07 -04001404static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001405 filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001406{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001407 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousecd915492006-09-04 12:49:07 -04001408 u32 hsize, len = 0;
Steven Whitehousecd915492006-09-04 12:49:07 -04001409 u32 hash, index;
Al Virob44b84d2006-10-14 10:46:30 -04001410 __be64 *lp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001411 int copied = 0;
1412 int error = 0;
Steven Whitehouse4da3c642006-07-11 13:19:13 -04001413 unsigned depth = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001414
Steven Whitehouse9a004502008-02-01 09:23:44 +00001415 hsize = 1 << dip->i_depth;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001416 hash = gfs2_dir_offset2hash(*offset);
Steven Whitehouse9a004502008-02-01 09:23:44 +00001417 index = hash >> (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001418
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001419 lp = gfs2_dir_get_hash_table(dip);
1420 if (IS_ERR(lp))
1421 return PTR_ERR(lp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001422
1423 while (index < hsize) {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001424 error = gfs2_dir_read_leaf(inode, offset, opaque, filldir,
1425 &copied, &depth,
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001426 be64_to_cpu(lp[index]));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001427 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001428 break;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001429
Steven Whitehouse9a004502008-02-01 09:23:44 +00001430 len = 1 << (dip->i_depth - depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001431 index = (index & ~(len - 1)) + len;
1432 }
1433
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001434 if (error > 0)
1435 error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001436 return error;
1437}
1438
Steven Whitehousecd915492006-09-04 12:49:07 -04001439int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001440 filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001441{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001442 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001443 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001444 struct dirent_gather g;
1445 const struct gfs2_dirent **darr, *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001446 struct buffer_head *dibh;
1447 int copied = 0;
1448 int error;
1449
Steven Whitehousead6203f2008-11-03 13:59:19 +00001450 if (!dip->i_entries)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001451 return 0;
1452
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001453 if (dip->i_diskflags & GFS2_DIF_EXHASH)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001454 return dir_e_read(inode, offset, opaque, filldir);
1455
David Teiglandb3b94fa2006-01-16 16:50:04 +00001456 if (!gfs2_is_stuffed(dip)) {
1457 gfs2_consist_inode(dip);
1458 return -EIO;
1459 }
1460
David Teiglandb3b94fa2006-01-16 16:50:04 +00001461 error = gfs2_meta_inode_buffer(dip, &dibh);
1462 if (error)
1463 return error;
1464
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001465 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001466 /* 96 is max number of dirents which can be stuffed into an inode */
Josef Bacik16c5f062008-04-09 09:33:41 -04001467 darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_NOFS);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001468 if (darr) {
1469 g.pdent = darr;
1470 g.offset = 0;
1471 dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size,
1472 gfs2_dirent_gather, NULL, &g);
1473 if (IS_ERR(dent)) {
1474 error = PTR_ERR(dent);
1475 goto out;
1476 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001477 if (dip->i_entries != g.offset) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001478 fs_warn(sdp, "Number of entries corrupt in dir %llu, "
Steven Whitehousead6203f2008-11-03 13:59:19 +00001479 "ip->i_entries (%u) != g.offset (%u)\n",
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001480 (unsigned long long)dip->i_no_addr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001481 dip->i_entries,
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001482 g.offset);
1483 error = -EIO;
1484 goto out;
1485 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001486 error = do_filldir_main(dip, offset, opaque, filldir, darr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001487 dip->i_entries, &copied);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001488out:
1489 kfree(darr);
1490 }
1491
David Teiglandb3b94fa2006-01-16 16:50:04 +00001492 if (error > 0)
1493 error = 0;
1494
1495 brelse(dibh);
1496
1497 return error;
1498}
1499
David Teiglandb3b94fa2006-01-16 16:50:04 +00001500/**
1501 * gfs2_dir_search - Search a directory
1502 * @dip: The GFS2 inode
1503 * @filename:
1504 * @inode:
1505 *
1506 * This routine searches a directory for a file or another directory.
1507 * Assumes a glock is held on dip.
1508 *
1509 * Returns: errno
1510 */
1511
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001512struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001513{
Steven Whitehousec7526662006-03-20 12:30:04 -05001514 struct buffer_head *bh;
1515 struct gfs2_dirent *dent;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001516 struct inode *inode;
1517
1518 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1519 if (dent) {
1520 if (IS_ERR(dent))
David Howellse231c2e2008-02-07 00:15:26 -08001521 return ERR_CAST(dent);
Wendy Chengbb9bcf02007-06-27 17:07:08 -04001522 inode = gfs2_inode_lookup(dir->i_sb,
1523 be16_to_cpu(dent->de_type),
1524 be64_to_cpu(dent->de_inum.no_addr),
Bob Peterson44ad37d2011-03-17 16:19:58 -04001525 be64_to_cpu(dent->de_inum.no_formal_ino), 0);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001526 brelse(bh);
1527 return inode;
1528 }
1529 return ERR_PTR(-ENOENT);
1530}
1531
1532int gfs2_dir_check(struct inode *dir, const struct qstr *name,
1533 const struct gfs2_inode *ip)
1534{
1535 struct buffer_head *bh;
1536 struct gfs2_dirent *dent;
1537 int ret = -ENOENT;
Steven Whitehousec7526662006-03-20 12:30:04 -05001538
1539 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1540 if (dent) {
1541 if (IS_ERR(dent))
1542 return PTR_ERR(dent);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001543 if (ip) {
1544 if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr)
1545 goto out;
1546 if (be64_to_cpu(dent->de_inum.no_formal_ino) !=
1547 ip->i_no_formal_ino)
1548 goto out;
1549 if (unlikely(IF2DT(ip->i_inode.i_mode) !=
1550 be16_to_cpu(dent->de_type))) {
1551 gfs2_consist_inode(GFS2_I(dir));
1552 ret = -EIO;
1553 goto out;
1554 }
1555 }
1556 ret = 0;
1557out:
Steven Whitehousec7526662006-03-20 12:30:04 -05001558 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001559 }
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001560 return ret;
Steven Whitehousec7526662006-03-20 12:30:04 -05001561}
1562
1563static int dir_new_leaf(struct inode *inode, const struct qstr *name)
1564{
1565 struct buffer_head *bh, *obh;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001566 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001567 struct gfs2_leaf *leaf, *oleaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001568 int error;
Steven Whitehousec7526662006-03-20 12:30:04 -05001569 u32 index;
1570 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001571
Steven Whitehouse9a004502008-02-01 09:23:44 +00001572 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -05001573 error = get_first_leaf(ip, index, &obh);
1574 if (error)
1575 return error;
1576 do {
1577 oleaf = (struct gfs2_leaf *)obh->b_data;
1578 bn = be64_to_cpu(oleaf->lf_next);
1579 if (!bn)
1580 break;
1581 brelse(obh);
1582 error = get_leaf(ip, bn, &obh);
1583 if (error)
1584 return error;
1585 } while(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001586
Steven Whitehousec7526662006-03-20 12:30:04 -05001587 gfs2_trans_add_bh(ip->i_gl, obh, 1);
1588
1589 leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth));
1590 if (!leaf) {
1591 brelse(obh);
1592 return -ENOSPC;
1593 }
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001594 oleaf->lf_next = cpu_to_be64(bh->b_blocknr);
Steven Whitehousec7526662006-03-20 12:30:04 -05001595 brelse(bh);
1596 brelse(obh);
1597
1598 error = gfs2_meta_inode_buffer(ip, &bh);
1599 if (error)
1600 return error;
1601 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001602 gfs2_add_inode_blocks(&ip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001603 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001604 brelse(bh);
1605 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001606}
1607
1608/**
1609 * gfs2_dir_add - Add new filename into directory
1610 * @dip: The GFS2 inode
1611 * @filename: The new name
1612 * @inode: The inode number of the entry
1613 * @type: The type of the entry
1614 *
1615 * Returns: 0 on success, error code on failure
1616 */
1617
Steven Whitehousec7526662006-03-20 12:30:04 -05001618int gfs2_dir_add(struct inode *inode, const struct qstr *name,
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001619 const struct gfs2_inode *nip)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001620{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001621 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001622 struct buffer_head *bh;
1623 struct gfs2_dirent *dent;
1624 struct gfs2_leaf *leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001625 int error;
1626
Steven Whitehousec7526662006-03-20 12:30:04 -05001627 while(1) {
1628 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space,
1629 &bh);
1630 if (dent) {
1631 if (IS_ERR(dent))
1632 return PTR_ERR(dent);
1633 dent = gfs2_init_dirent(inode, dent, name, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001634 gfs2_inum_out(nip, dent);
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001635 dent->de_type = cpu_to_be16(IF2DT(nip->i_inode.i_mode));
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001636 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001637 leaf = (struct gfs2_leaf *)bh->b_data;
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001638 be16_add_cpu(&leaf->lf_entries, 1);
Steven Whitehousec7526662006-03-20 12:30:04 -05001639 }
1640 brelse(bh);
1641 error = gfs2_meta_inode_buffer(ip, &bh);
1642 if (error)
1643 break;
1644 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001645 ip->i_entries++;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001646 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse3d6ecb72011-05-09 13:30:08 +01001647 if (S_ISDIR(nip->i_inode.i_mode))
1648 inc_nlink(&ip->i_inode);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001649 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001650 brelse(bh);
1651 error = 0;
1652 break;
1653 }
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001654 if (!(ip->i_diskflags & GFS2_DIF_EXHASH)) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001655 error = dir_make_exhash(inode);
1656 if (error)
1657 break;
1658 continue;
1659 }
1660 error = dir_split_leaf(inode, name);
1661 if (error == 0)
1662 continue;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001663 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001664 break;
Steven Whitehouse9a004502008-02-01 09:23:44 +00001665 if (ip->i_depth < GFS2_DIR_MAX_DEPTH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001666 error = dir_double_exhash(ip);
1667 if (error)
1668 break;
1669 error = dir_split_leaf(inode, name);
Steven Whitehousee90deff2006-03-29 19:02:15 -05001670 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001671 break;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001672 if (error == 0)
1673 continue;
Steven Whitehousec7526662006-03-20 12:30:04 -05001674 }
1675 error = dir_new_leaf(inode, name);
1676 if (!error)
1677 continue;
1678 error = -ENOSPC;
1679 break;
1680 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001681 return error;
1682}
1683
Steven Whitehousec7526662006-03-20 12:30:04 -05001684
David Teiglandb3b94fa2006-01-16 16:50:04 +00001685/**
1686 * gfs2_dir_del - Delete a directory entry
1687 * @dip: The GFS2 inode
1688 * @filename: The filename
1689 *
1690 * Returns: 0 on success, error code on failure
1691 */
1692
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001693int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001694{
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001695 const struct qstr *name = &dentry->d_name;
Steven Whitehousec7526662006-03-20 12:30:04 -05001696 struct gfs2_dirent *dent, *prev = NULL;
1697 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001698 int error;
1699
Steven Whitehousec7526662006-03-20 12:30:04 -05001700 /* Returns _either_ the entry (if its first in block) or the
1701 previous entry otherwise */
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001702 dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001703 if (!dent) {
1704 gfs2_consist_inode(dip);
1705 return -EIO;
1706 }
1707 if (IS_ERR(dent)) {
1708 gfs2_consist_inode(dip);
1709 return PTR_ERR(dent);
1710 }
1711 /* If not first in block, adjust pointers accordingly */
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001712 if (gfs2_dirent_find(dent, name, NULL) == 0) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001713 prev = dent;
1714 dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len));
1715 }
1716
1717 dirent_del(dip, bh, prev, dent);
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001718 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001719 struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
1720 u16 entries = be16_to_cpu(leaf->lf_entries);
1721 if (!entries)
1722 gfs2_consist_inode(dip);
1723 leaf->lf_entries = cpu_to_be16(--entries);
Steven Whitehousec7526662006-03-20 12:30:04 -05001724 }
Steven Whitehouseed386502006-04-07 16:28:07 -04001725 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001726
1727 error = gfs2_meta_inode_buffer(dip, &bh);
1728 if (error)
1729 return error;
1730
Steven Whitehousead6203f2008-11-03 13:59:19 +00001731 if (!dip->i_entries)
Steven Whitehousec7526662006-03-20 12:30:04 -05001732 gfs2_consist_inode(dip);
1733 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001734 dip->i_entries--;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001735 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001736 if (S_ISDIR(dentry->d_inode->i_mode))
1737 drop_nlink(&dip->i_inode);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001738 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001739 brelse(bh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001740 mark_inode_dirty(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001741
1742 return error;
1743}
1744
David Teiglandb3b94fa2006-01-16 16:50:04 +00001745/**
1746 * gfs2_dir_mvino - Change inode number of directory entry
1747 * @dip: The GFS2 inode
1748 * @filename:
1749 * @new_inode:
1750 *
1751 * This routine changes the inode number of a directory entry. It's used
1752 * by rename to change ".." when a directory is moved.
1753 * Assumes a glock is held on dvp.
1754 *
1755 * Returns: errno
1756 */
1757
Steven Whitehousec7526662006-03-20 12:30:04 -05001758int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001759 const struct gfs2_inode *nip, unsigned int new_type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001760{
Steven Whitehousec7526662006-03-20 12:30:04 -05001761 struct buffer_head *bh;
1762 struct gfs2_dirent *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001763 int error;
1764
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001765 dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001766 if (!dent) {
1767 gfs2_consist_inode(dip);
1768 return -EIO;
1769 }
1770 if (IS_ERR(dent))
1771 return PTR_ERR(dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001772
Steven Whitehousec7526662006-03-20 12:30:04 -05001773 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001774 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001775 dent->de_type = cpu_to_be16(new_type);
1776
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001777 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001778 brelse(bh);
1779 error = gfs2_meta_inode_buffer(dip, &bh);
1780 if (error)
1781 return error;
1782 gfs2_trans_add_bh(dip->i_gl, bh, 1);
1783 }
1784
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001785 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001786 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001787 brelse(bh);
1788 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001789}
1790
1791/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001792 * leaf_dealloc - Deallocate a directory leaf
1793 * @dip: the directory
1794 * @index: the hash table offset in the directory
1795 * @len: the number of pointers to this leaf
1796 * @leaf_no: the leaf number
Bob Petersonec038c82011-03-22 13:55:23 -04001797 * @leaf_bh: buffer_head for the starting leaf
Bob Petersond24a7a42011-03-22 13:54:03 -04001798 * last_dealloc: 1 if this is the final dealloc for the leaf, else 0
David Teiglandb3b94fa2006-01-16 16:50:04 +00001799 *
1800 * Returns: errno
1801 */
1802
Steven Whitehousecd915492006-09-04 12:49:07 -04001803static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
Bob Petersonec038c82011-03-22 13:55:23 -04001804 u64 leaf_no, struct buffer_head *leaf_bh,
1805 int last_dealloc)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001806{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001807 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001808 struct gfs2_leaf *tmp_leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001809 struct gfs2_rgrp_list rlist;
1810 struct buffer_head *bh, *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001811 u64 blk, nblk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001812 unsigned int rg_blocks = 0, l_blocks = 0;
1813 char *ht;
Steven Whitehousecd915492006-09-04 12:49:07 -04001814 unsigned int x, size = len * sizeof(u64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001815 int error;
1816
1817 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1818
Josef Bacik16c5f062008-04-09 09:33:41 -04001819 ht = kzalloc(size, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001820 if (!ht)
1821 return -ENOMEM;
1822
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001823 if (!gfs2_alloc_get(dip)) {
1824 error = -ENOMEM;
1825 goto out;
1826 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001827
1828 error = gfs2_quota_hold(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1829 if (error)
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001830 goto out_put;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001831
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001832 error = gfs2_rindex_hold(sdp, &dip->i_alloc->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001833 if (error)
1834 goto out_qs;
1835
1836 /* Count the number of leaves */
Bob Petersonec038c82011-03-22 13:55:23 -04001837 bh = leaf_bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001838
Steven Whitehousec7526662006-03-20 12:30:04 -05001839 for (blk = leaf_no; blk; blk = nblk) {
Bob Petersonec038c82011-03-22 13:55:23 -04001840 if (blk != leaf_no) {
1841 error = get_leaf(dip, blk, &bh);
1842 if (error)
1843 goto out_rlist;
1844 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001845 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1846 nblk = be64_to_cpu(tmp_leaf->lf_next);
Bob Petersonec038c82011-03-22 13:55:23 -04001847 if (blk != leaf_no)
1848 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001849
1850 gfs2_rlist_add(sdp, &rlist, blk);
1851 l_blocks++;
1852 }
1853
Bob Petersonfe6c9912008-01-28 11:13:02 -06001854 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001855
1856 for (x = 0; x < rlist.rl_rgrps; x++) {
1857 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001858 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001859 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001860 }
1861
1862 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1863 if (error)
1864 goto out_rlist;
1865
1866 error = gfs2_trans_begin(sdp,
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001867 rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) +
David Teiglandb3b94fa2006-01-16 16:50:04 +00001868 RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks);
1869 if (error)
1870 goto out_rg_gunlock;
1871
Bob Petersonec038c82011-03-22 13:55:23 -04001872 bh = leaf_bh;
1873
Steven Whitehousec7526662006-03-20 12:30:04 -05001874 for (blk = leaf_no; blk; blk = nblk) {
Bob Petersonec038c82011-03-22 13:55:23 -04001875 if (blk != leaf_no) {
1876 error = get_leaf(dip, blk, &bh);
1877 if (error)
1878 goto out_end_trans;
1879 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001880 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1881 nblk = be64_to_cpu(tmp_leaf->lf_next);
Bob Petersonec038c82011-03-22 13:55:23 -04001882 if (blk != leaf_no)
1883 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001884
1885 gfs2_free_meta(dip, blk, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001886 gfs2_add_inode_blocks(&dip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001887 }
1888
Steven Whitehousecd915492006-09-04 12:49:07 -04001889 error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001890 if (error != size) {
1891 if (error >= 0)
1892 error = -EIO;
1893 goto out_end_trans;
1894 }
1895
1896 error = gfs2_meta_inode_buffer(dip, &dibh);
1897 if (error)
1898 goto out_end_trans;
1899
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001900 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
Bob Petersond24a7a42011-03-22 13:54:03 -04001901 /* On the last dealloc, make this a regular file in case we crash.
1902 (We don't want to free these blocks a second time.) */
1903 if (last_dealloc)
1904 dip->i_inode.i_mode = S_IFREG;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001905 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001906 brelse(dibh);
1907
Steven Whitehousea91ea692006-09-04 12:04:26 -04001908out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001909 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001910out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001911 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001912out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001913 gfs2_rlist_free(&rlist);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001914 gfs2_glock_dq_uninit(&dip->i_alloc->al_ri_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001915out_qs:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001916 gfs2_quota_unhold(dip);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001917out_put:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001918 gfs2_alloc_put(dip);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001919out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001920 kfree(ht);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001921 return error;
1922}
1923
1924/**
1925 * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory
1926 * @dip: the directory
1927 *
1928 * Dealloc all on-disk directory leaves to FREEMETA state
1929 * Change on-disk inode type to "regular file"
1930 *
1931 * Returns: errno
1932 */
1933
1934int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
1935{
Bob Peterson556bb172011-03-22 13:56:37 -04001936 struct buffer_head *bh;
1937 struct gfs2_leaf *leaf;
1938 u32 hsize, len;
Bob Peterson556bb172011-03-22 13:56:37 -04001939 u32 index = 0, next_index;
1940 __be64 *lp;
1941 u64 leaf_no;
1942 int error = 0, last;
1943
1944 hsize = 1 << dip->i_depth;
Bob Peterson556bb172011-03-22 13:56:37 -04001945
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001946 lp = gfs2_dir_get_hash_table(dip);
1947 if (IS_ERR(lp))
1948 return PTR_ERR(lp);
Bob Peterson556bb172011-03-22 13:56:37 -04001949
1950 while (index < hsize) {
Steven Whitehouse17d539f2011-06-15 10:29:37 +01001951 leaf_no = be64_to_cpu(lp[index]);
Bob Peterson556bb172011-03-22 13:56:37 -04001952 if (leaf_no) {
1953 error = get_leaf(dip, leaf_no, &bh);
1954 if (error)
1955 goto out;
1956 leaf = (struct gfs2_leaf *)bh->b_data;
1957 len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
1958
1959 next_index = (index & ~(len - 1)) + len;
1960 last = ((next_index >= hsize) ? 1 : 0);
1961 error = leaf_dealloc(dip, index, len, leaf_no, bh,
1962 last);
1963 brelse(bh);
1964 if (error)
1965 goto out;
1966 index = next_index;
1967 } else
1968 index++;
1969 }
1970
1971 if (index != hsize) {
1972 gfs2_consist_inode(dip);
1973 error = -EIO;
1974 }
1975
1976out:
Bob Peterson556bb172011-03-22 13:56:37 -04001977
1978 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001979}
1980
1981/**
1982 * gfs2_diradd_alloc_required - find if adding entry will require an allocation
1983 * @ip: the file being written to
1984 * @filname: the filename that's going to be added
David Teiglandb3b94fa2006-01-16 16:50:04 +00001985 *
Steven Whitehousec7526662006-03-20 12:30:04 -05001986 * Returns: 1 if alloc required, 0 if not, -ve on error
David Teiglandb3b94fa2006-01-16 16:50:04 +00001987 */
1988
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001989int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001990{
Steven Whitehousec7526662006-03-20 12:30:04 -05001991 struct gfs2_dirent *dent;
1992 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001993
Steven Whitehousec7526662006-03-20 12:30:04 -05001994 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh);
Steven Whitehouseed386502006-04-07 16:28:07 -04001995 if (!dent) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001996 return 1;
Steven Whitehouseed386502006-04-07 16:28:07 -04001997 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001998 if (IS_ERR(dent))
1999 return PTR_ERR(dent);
2000 brelse(bh);
2001 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002002}
2003