blob: 2beb2f401aa24a2b23cf511d813d21db06e521b7 [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 *
39 * dip->i_di.di_flags & GFS2_DIF_EXHASH is true
40 *
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>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020063#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000064
65#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050066#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000067#include "dir.h"
68#include "glock.h"
69#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000070#include "meta_io.h"
71#include "quota.h"
72#include "rgrp.h"
73#include "trans.h"
Steven Whitehousee13940b2006-01-30 13:31:50 +000074#include "bmap.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050075#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000076
77#define IS_LEAF 1 /* Hashed (leaf) directory */
78#define IS_DINODE 2 /* Linear (stuffed dinode block) directory */
79
Steven Whitehousecd915492006-09-04 12:49:07 -040080#define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1)
81#define gfs2_dir_offset2hash(p) ((u32)(((u64)(p)) << 1))
David Teiglandb3b94fa2006-01-16 16:50:04 +000082
Steven Whitehouse907b9bc2006-09-25 09:26:04 -040083typedef int (*leaf_call_t) (struct gfs2_inode *dip, u32 index, u32 len,
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040084 u64 leaf_no, void *data);
85typedef 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 Whitehouse61e085a2006-04-24 10:07:13 -040088
Steven Whitehousecd915492006-09-04 12:49:07 -040089int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -040090 struct buffer_head **bhp)
Steven Whitehousee13940b2006-01-30 13:31:50 +000091{
92 struct buffer_head *bh;
Steven Whitehousee13940b2006-01-30 13:31:50 +000093
Steven Whitehouse61e085a2006-04-24 10:07:13 -040094 bh = gfs2_meta_new(ip->i_gl, block);
95 gfs2_trans_add_bh(ip->i_gl, bh, 1);
96 gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD);
97 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
Steven Whitehousee13940b2006-01-30 13:31:50 +000098 *bhp = bh;
99 return 0;
100}
101
Steven Whitehousecd915492006-09-04 12:49:07 -0400102static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block,
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400103 struct buffer_head **bhp)
104{
105 struct buffer_head *bh;
106 int error;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000107
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400108 error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, &bh);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400109 if (error)
110 return error;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400111 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) {
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400112 brelse(bh);
113 return -EIO;
114 }
115 *bhp = bh;
116 return 0;
117}
Steven Whitehousee13940b2006-01-30 13:31:50 +0000118
119static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf,
120 unsigned int offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000121{
122 struct buffer_head *dibh;
123 int error;
124
125 error = gfs2_meta_inode_buffer(ip, &dibh);
126 if (error)
127 return error;
128
129 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehousec7526662006-03-20 12:30:04 -0500130 memcpy(dibh->b_data + offset + sizeof(struct gfs2_dinode), buf, size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000131 if (ip->i_di.di_size < offset + size)
132 ip->i_di.di_size = offset + size;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100133 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500134 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000135
136 brelse(dibh);
137
138 return size;
139}
140
141
142
143/**
144 * gfs2_dir_write_data - Write directory information to the inode
145 * @ip: The GFS2 inode
146 * @buf: The buffer containing information to be written
147 * @offset: The file offset to start writing at
148 * @size: The amount of data to write
149 *
150 * Returns: The number of bytes correctly written or error code
151 */
152static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
Steven Whitehousecd915492006-09-04 12:49:07 -0400153 u64 offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000154{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400155 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000156 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400157 u64 lblock, dblock;
158 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000159 unsigned int o;
160 int copied = 0;
161 int error = 0;
162
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;
Adrian Bunk348acd42006-10-19 15:20:04 +0200186 int new = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000187
188 amount = size - copied;
189 if (amount > sdp->sd_sb.sb_bsize - o)
190 amount = sdp->sd_sb.sb_bsize - o;
191
192 if (!extlen) {
193 new = 1;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400194 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400195 &dblock, &extlen);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000196 if (error)
197 goto fail;
198 error = -EIO;
199 if (gfs2_assert_withdraw(sdp, dblock))
200 goto fail;
201 }
202
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400203 if (amount == sdp->sd_jbsize || new)
204 error = gfs2_dir_get_new_buffer(ip, dblock, &bh);
205 else
206 error = gfs2_dir_get_existing_buffer(ip, dblock, &bh);
207
Steven Whitehousee13940b2006-01-30 13:31:50 +0000208 if (error)
209 goto fail;
210
211 gfs2_trans_add_bh(ip->i_gl, bh, 1);
212 memcpy(bh->b_data + o, buf, amount);
213 brelse(bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000214
Steven Whitehouse899bb262006-08-01 15:28:57 -0400215 buf += amount;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000216 copied += amount;
217 lblock++;
218 dblock++;
219 extlen--;
220
221 o = sizeof(struct gfs2_meta_header);
222 }
223
224out:
225 error = gfs2_meta_inode_buffer(ip, &dibh);
226 if (error)
227 return error;
228
229 if (ip->i_di.di_size < offset + copied)
230 ip->i_di.di_size = offset + copied;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100231 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000232
233 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500234 gfs2_dinode_out(ip, dibh->b_data);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000235 brelse(dibh);
236
237 return copied;
238fail:
239 if (copied)
240 goto out;
241 return error;
242}
243
244static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, char *buf,
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400245 u64 offset, unsigned int size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000246{
247 struct buffer_head *dibh;
248 int error;
249
250 error = gfs2_meta_inode_buffer(ip, &dibh);
251 if (!error) {
252 offset += sizeof(struct gfs2_dinode);
253 memcpy(buf, dibh->b_data + offset, size);
254 brelse(dibh);
255 }
256
257 return (error) ? error : size;
258}
259
260
261/**
262 * gfs2_dir_read_data - Read a data from a directory inode
263 * @ip: The GFS2 Inode
264 * @buf: The buffer to place result into
265 * @offset: File offset to begin jdata_readng from
266 * @size: Amount of data to transfer
267 *
268 * Returns: The amount of data actually copied or the error
269 */
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400270static int gfs2_dir_read_data(struct gfs2_inode *ip, char *buf, u64 offset,
271 unsigned int size, unsigned ra)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000272{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400273 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehousecd915492006-09-04 12:49:07 -0400274 u64 lblock, dblock;
275 u32 extlen = 0;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000276 unsigned int o;
277 int copied = 0;
278 int error = 0;
279
280 if (offset >= ip->i_di.di_size)
281 return 0;
282
Jan Engelhardtc53921242006-09-05 14:30:40 +0200283 if (offset + size > ip->i_di.di_size)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000284 size = ip->i_di.di_size - offset;
285
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 Whitehouse5e7d65c2006-11-17 12:27:44 -0500342static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent)
343{
344 return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0;
345}
346
Steven Whitehousec7526662006-03-20 12:30:04 -0500347static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent,
348 const struct qstr *name, int ret)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000349{
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500350 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500351 be32_to_cpu(dent->de_hash) == name->hash &&
352 be16_to_cpu(dent->de_name_len) == name->len &&
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400353 memcmp(dent+1, name->name, name->len) == 0)
Steven Whitehousec7526662006-03-20 12:30:04 -0500354 return ret;
355 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000356}
357
Steven Whitehousec7526662006-03-20 12:30:04 -0500358static int gfs2_dirent_find(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500359 const struct qstr *name,
360 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500361{
362 return __gfs2_dirent_find(dent, name, 1);
363}
364
365static int gfs2_dirent_prev(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500366 const struct qstr *name,
367 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500368{
369 return __gfs2_dirent_find(dent, name, 2);
370}
371
372/*
373 * name->name holds ptr to start of block.
374 * name->len holds size of block.
375 */
376static int gfs2_dirent_last(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500377 const struct qstr *name,
378 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500379{
380 const char *start = name->name;
381 const char *end = (const char *)dent + be16_to_cpu(dent->de_rec_len);
382 if (name->len == (end - start))
383 return 1;
384 return 0;
385}
386
387static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500388 const struct qstr *name,
389 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500390{
391 unsigned required = GFS2_DIRENT_SIZE(name->len);
392 unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
393 unsigned totlen = be16_to_cpu(dent->de_rec_len);
394
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500395 if (gfs2_dirent_sentinel(dent))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500396 actual = GFS2_DIRENT_SIZE(0);
Jan Engelhardtc53921242006-09-05 14:30:40 +0200397 if (totlen - actual >= required)
Steven Whitehousec7526662006-03-20 12:30:04 -0500398 return 1;
399 return 0;
400}
401
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500402struct dirent_gather {
403 const struct gfs2_dirent **pdent;
404 unsigned offset;
405};
406
407static int gfs2_dirent_gather(const struct gfs2_dirent *dent,
408 const struct qstr *name,
409 void *opaque)
410{
411 struct dirent_gather *g = opaque;
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500412 if (!gfs2_dirent_sentinel(dent)) {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500413 g->pdent[g->offset++] = dent;
414 }
415 return 0;
416}
417
Steven Whitehousec7526662006-03-20 12:30:04 -0500418/*
419 * Other possible things to check:
420 * - Inode located within filesystem size (and on valid block)
421 * - Valid directory entry type
422 * Not sure how heavy-weight we want to make this... could also check
423 * hash is correct for example, but that would take a lot of extra time.
424 * For now the most important thing is to check that the various sizes
425 * are correct.
426 */
427static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset,
428 unsigned int size, unsigned int len, int first)
429{
430 const char *msg = "gfs2_dirent too small";
431 if (unlikely(size < sizeof(struct gfs2_dirent)))
432 goto error;
433 msg = "gfs2_dirent misaligned";
434 if (unlikely(offset & 0x7))
435 goto error;
436 msg = "gfs2_dirent points beyond end of block";
437 if (unlikely(offset + size > len))
438 goto error;
439 msg = "zero inode number";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500440 if (unlikely(!first && gfs2_dirent_sentinel(dent)))
Steven Whitehousec7526662006-03-20 12:30:04 -0500441 goto error;
442 msg = "name length is greater than space in dirent";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500443 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500444 unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) >
445 size))
446 goto error;
447 return 0;
448error:
449 printk(KERN_WARNING "gfs2_check_dirent: %s (%s)\n", msg,
450 first ? "first in block" : "not first in block");
451 return -EIO;
452}
453
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500454static int gfs2_dirent_offset(const void *buf)
Steven Whitehousec7526662006-03-20 12:30:04 -0500455{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500456 const struct gfs2_meta_header *h = buf;
457 int offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500458
459 BUG_ON(buf == NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500460
Steven Whitehousee3167de2006-03-30 15:46:23 -0500461 switch(be32_to_cpu(h->mh_type)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500462 case GFS2_METATYPE_LF:
463 offset = sizeof(struct gfs2_leaf);
464 break;
465 case GFS2_METATYPE_DI:
466 offset = sizeof(struct gfs2_dinode);
467 break;
468 default:
469 goto wrong_type;
470 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500471 return offset;
472wrong_type:
473 printk(KERN_WARNING "gfs2_scan_dirent: wrong block type %u\n",
Steven Whitehousee3167de2006-03-30 15:46:23 -0500474 be32_to_cpu(h->mh_type));
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500475 return -1;
476}
Steven Whitehousec7526662006-03-20 12:30:04 -0500477
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400478static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500479 unsigned int len, gfs2_dscan_t scan,
480 const struct qstr *name,
481 void *opaque)
482{
483 struct gfs2_dirent *dent, *prev;
484 unsigned offset;
485 unsigned size;
486 int ret = 0;
487
488 ret = gfs2_dirent_offset(buf);
489 if (ret < 0)
490 goto consist_inode;
491
492 offset = ret;
Steven Whitehousec7526662006-03-20 12:30:04 -0500493 prev = NULL;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400494 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500495 size = be16_to_cpu(dent->de_rec_len);
496 if (gfs2_check_dirent(dent, offset, size, len, 1))
497 goto consist_inode;
498 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500499 ret = scan(dent, name, opaque);
Steven Whitehousec7526662006-03-20 12:30:04 -0500500 if (ret)
501 break;
502 offset += size;
503 if (offset == len)
504 break;
505 prev = dent;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400506 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500507 size = be16_to_cpu(dent->de_rec_len);
508 if (gfs2_check_dirent(dent, offset, size, len, 0))
509 goto consist_inode;
510 } while(1);
511
512 switch(ret) {
513 case 0:
514 return NULL;
515 case 1:
516 return dent;
517 case 2:
518 return prev ? prev : dent;
519 default:
520 BUG_ON(ret > 0);
521 return ERR_PTR(ret);
522 }
523
Steven Whitehousec7526662006-03-20 12:30:04 -0500524consist_inode:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400525 gfs2_consist_inode(GFS2_I(inode));
Steven Whitehousec7526662006-03-20 12:30:04 -0500526 return ERR_PTR(-EIO);
527}
528
529
David Teiglandb3b94fa2006-01-16 16:50:04 +0000530/**
531 * dirent_first - Return the first dirent
532 * @dip: the directory
533 * @bh: The buffer
534 * @dent: Pointer to list of dirents
535 *
536 * return first dirent whether bh points to leaf or stuffed dinode
537 *
538 * Returns: IS_LEAF, IS_DINODE, or -errno
539 */
540
541static int dirent_first(struct gfs2_inode *dip, struct buffer_head *bh,
542 struct gfs2_dirent **dent)
543{
544 struct gfs2_meta_header *h = (struct gfs2_meta_header *)bh->b_data;
545
Steven Whitehousee3167de2006-03-30 15:46:23 -0500546 if (be32_to_cpu(h->mh_type) == GFS2_METATYPE_LF) {
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400547 if (gfs2_meta_check(GFS2_SB(&dip->i_inode), bh))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000548 return -EIO;
549 *dent = (struct gfs2_dirent *)(bh->b_data +
550 sizeof(struct gfs2_leaf));
551 return IS_LEAF;
552 } else {
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400553 if (gfs2_metatype_check(GFS2_SB(&dip->i_inode), bh, GFS2_METATYPE_DI))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000554 return -EIO;
555 *dent = (struct gfs2_dirent *)(bh->b_data +
556 sizeof(struct gfs2_dinode));
557 return IS_DINODE;
558 }
559}
560
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400561static int dirent_check_reclen(struct gfs2_inode *dip,
562 const struct gfs2_dirent *d, const void *end_p)
563{
564 const void *ptr = d;
565 u16 rec_len = be16_to_cpu(d->de_rec_len);
566
567 if (unlikely(rec_len < sizeof(struct gfs2_dirent)))
568 goto broken;
569 ptr += rec_len;
570 if (ptr < end_p)
571 return rec_len;
572 if (ptr == end_p)
573 return -ENOENT;
574broken:
575 gfs2_consist_inode(dip);
576 return -EIO;
577}
578
David Teiglandb3b94fa2006-01-16 16:50:04 +0000579/**
580 * dirent_next - Next dirent
581 * @dip: the directory
582 * @bh: The buffer
583 * @dent: Pointer to list of dirents
584 *
585 * Returns: 0 on success, error code otherwise
586 */
587
588static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
589 struct gfs2_dirent **dent)
590{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400591 struct gfs2_dirent *cur = *dent, *tmp;
592 char *bh_end = bh->b_data + bh->b_size;
593 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000594
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400595 ret = dirent_check_reclen(dip, cur, bh_end);
596 if (ret < 0)
597 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000598
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400599 tmp = (void *)cur + ret;
600 ret = dirent_check_reclen(dip, tmp, bh_end);
601 if (ret == -EIO)
602 return ret;
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000603
David Teiglandb3b94fa2006-01-16 16:50:04 +0000604 /* Only the first dent could ever have de_inum.no_addr == 0 */
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500605 if (gfs2_dirent_sentinel(tmp)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 gfs2_consist_inode(dip);
607 return -EIO;
608 }
609
610 *dent = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000611 return 0;
612}
613
614/**
615 * dirent_del - Delete a dirent
616 * @dip: The GFS2 inode
617 * @bh: The buffer
618 * @prev: The previous dirent
619 * @cur: The current dirent
620 *
621 */
622
623static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
624 struct gfs2_dirent *prev, struct gfs2_dirent *cur)
625{
Steven Whitehousecd915492006-09-04 12:49:07 -0400626 u16 cur_rec_len, prev_rec_len;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000627
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500628 if (gfs2_dirent_sentinel(cur)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000629 gfs2_consist_inode(dip);
630 return;
631 }
632
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000633 gfs2_trans_add_bh(dip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000634
635 /* If there is no prev entry, this is the first entry in the block.
636 The de_rec_len is already as big as it needs to be. Just zero
637 out the inode number and return. */
638
639 if (!prev) {
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500640 cur->de_inum.no_addr = 0;
641 cur->de_inum.no_formal_ino = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000642 return;
643 }
644
645 /* Combine this dentry with the previous one. */
646
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000647 prev_rec_len = be16_to_cpu(prev->de_rec_len);
648 cur_rec_len = be16_to_cpu(cur->de_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000649
650 if ((char *)prev + prev_rec_len != (char *)cur)
651 gfs2_consist_inode(dip);
652 if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size)
653 gfs2_consist_inode(dip);
654
655 prev_rec_len += cur_rec_len;
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000656 prev->de_rec_len = cpu_to_be16(prev_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000657}
658
Steven Whitehousec7526662006-03-20 12:30:04 -0500659/*
660 * Takes a dent from which to grab space as an argument. Returns the
661 * newly created dent.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000662 */
Adrian Bunk08bc2db2006-04-28 10:59:12 -0400663static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
664 struct gfs2_dirent *dent,
665 const struct qstr *name,
666 struct buffer_head *bh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000667{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400668 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -0500669 struct gfs2_dirent *ndent;
670 unsigned offset = 0, totlen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000671
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500672 if (!gfs2_dirent_sentinel(dent))
Steven Whitehousec7526662006-03-20 12:30:04 -0500673 offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
674 totlen = be16_to_cpu(dent->de_rec_len);
675 BUG_ON(offset + name->len > totlen);
676 gfs2_trans_add_bh(ip->i_gl, bh, 1);
677 ndent = (struct gfs2_dirent *)((char *)dent + offset);
678 dent->de_rec_len = cpu_to_be16(offset);
679 gfs2_qstr2dirent(name, totlen - offset, ndent);
680 return ndent;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000681}
682
Steven Whitehousec7526662006-03-20 12:30:04 -0500683static struct gfs2_dirent *gfs2_dirent_alloc(struct inode *inode,
684 struct buffer_head *bh,
685 const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000686{
687 struct gfs2_dirent *dent;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400688 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500689 gfs2_dirent_find_space, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500690 if (!dent || IS_ERR(dent))
691 return dent;
692 return gfs2_init_dirent(inode, dent, name, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000693}
694
Steven Whitehousecd915492006-09-04 12:49:07 -0400695static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696 struct buffer_head **bhp)
697{
698 int error;
699
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400700 error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, bhp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400701 if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
702 /* printk(KERN_INFO "block num=%llu\n", leaf_no); */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000703 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400704 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000705
706 return error;
707}
708
709/**
710 * get_leaf_nr - Get a leaf number associated with the index
711 * @dip: The GFS2 inode
712 * @index:
713 * @leaf_out:
714 *
715 * Returns: 0 on success, error code otherwise
716 */
717
Steven Whitehousecd915492006-09-04 12:49:07 -0400718static int get_leaf_nr(struct gfs2_inode *dip, u32 index,
719 u64 *leaf_out)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000720{
Al Virob44b84d2006-10-14 10:46:30 -0400721 __be64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000722 int error;
723
Steven Whitehousee13940b2006-01-30 13:31:50 +0000724 error = gfs2_dir_read_data(dip, (char *)&leaf_no,
Al Virob44b84d2006-10-14 10:46:30 -0400725 index * sizeof(__be64),
726 sizeof(__be64), 0);
Steven Whitehousecd915492006-09-04 12:49:07 -0400727 if (error != sizeof(u64))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000728 return (error < 0) ? error : -EIO;
729
730 *leaf_out = be64_to_cpu(leaf_no);
731
732 return 0;
733}
734
Steven Whitehousecd915492006-09-04 12:49:07 -0400735static int get_first_leaf(struct gfs2_inode *dip, u32 index,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736 struct buffer_head **bh_out)
737{
Steven Whitehousecd915492006-09-04 12:49:07 -0400738 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000739 int error;
740
741 error = get_leaf_nr(dip, index, &leaf_no);
742 if (!error)
743 error = get_leaf(dip, leaf_no, bh_out);
744
745 return error;
746}
747
Steven Whitehousec7526662006-03-20 12:30:04 -0500748static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
749 const struct qstr *name,
750 gfs2_dscan_t scan,
751 struct buffer_head **pbh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000752{
Steven Whitehousec7526662006-03-20 12:30:04 -0500753 struct buffer_head *bh;
754 struct gfs2_dirent *dent;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400755 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000756 int error;
757
Steven Whitehousec7526662006-03-20 12:30:04 -0500758 if (ip->i_di.di_flags & GFS2_DIF_EXHASH) {
759 struct gfs2_leaf *leaf;
760 unsigned hsize = 1 << ip->i_di.di_depth;
761 unsigned index;
762 u64 ln;
763 if (hsize * sizeof(u64) != ip->i_di.di_size) {
764 gfs2_consist_inode(ip);
765 return ERR_PTR(-EIO);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000766 }
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400767
Steven Whitehousec7526662006-03-20 12:30:04 -0500768 index = name->hash >> (32 - ip->i_di.di_depth);
769 error = get_first_leaf(ip, index, &bh);
770 if (error)
771 return ERR_PTR(error);
772 do {
773 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500774 scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500775 if (dent)
776 goto got_dent;
777 leaf = (struct gfs2_leaf *)bh->b_data;
778 ln = be64_to_cpu(leaf->lf_next);
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400779 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500780 if (!ln)
781 break;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400782
Steven Whitehousec7526662006-03-20 12:30:04 -0500783 error = get_leaf(ip, ln, &bh);
784 } while(!error);
785
786 return error ? ERR_PTR(error) : NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000787 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000788
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400789
Steven Whitehousec7526662006-03-20 12:30:04 -0500790 error = gfs2_meta_inode_buffer(ip, &bh);
791 if (error)
792 return ERR_PTR(error);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500793 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500794got_dent:
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400795 if (unlikely(dent == NULL || IS_ERR(dent))) {
Steven Whitehouseed386502006-04-07 16:28:07 -0400796 brelse(bh);
797 bh = NULL;
798 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500799 *pbh = bh;
800 return dent;
801}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000802
Steven Whitehousec7526662006-03-20 12:30:04 -0500803static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth)
804{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400805 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -0500806 u64 bn = gfs2_alloc_meta(ip);
807 struct buffer_head *bh = gfs2_meta_new(ip->i_gl, bn);
808 struct gfs2_leaf *leaf;
809 struct gfs2_dirent *dent;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500810 struct qstr name = { .name = "", .len = 0, .hash = 0 };
Steven Whitehousec7526662006-03-20 12:30:04 -0500811 if (!bh)
812 return NULL;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400813
Steven Whitehousec7526662006-03-20 12:30:04 -0500814 gfs2_trans_add_bh(ip->i_gl, bh, 1);
815 gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
816 leaf = (struct gfs2_leaf *)bh->b_data;
817 leaf->lf_depth = cpu_to_be16(depth);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400818 leaf->lf_entries = 0;
Al Viroa2d7d022006-10-14 16:49:30 +0100819 leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400820 leaf->lf_next = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500821 memset(leaf->lf_reserved, 0, sizeof(leaf->lf_reserved));
822 dent = (struct gfs2_dirent *)(leaf+1);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500823 gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent);
Steven Whitehousec7526662006-03-20 12:30:04 -0500824 *pbh = bh;
825 return leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000826}
827
828/**
829 * dir_make_exhash - Convert a stuffed directory into an ExHash directory
830 * @dip: The GFS2 inode
831 *
832 * Returns: 0 on success, error code otherwise
833 */
834
Steven Whitehousec7526662006-03-20 12:30:04 -0500835static int dir_make_exhash(struct inode *inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000836{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400837 struct gfs2_inode *dip = GFS2_I(inode);
838 struct gfs2_sbd *sdp = GFS2_SB(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000839 struct gfs2_dirent *dent;
Steven Whitehousec7526662006-03-20 12:30:04 -0500840 struct qstr args;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000841 struct buffer_head *bh, *dibh;
842 struct gfs2_leaf *leaf;
843 int y;
Steven Whitehousecd915492006-09-04 12:49:07 -0400844 u32 x;
Al Virob44b84d2006-10-14 10:46:30 -0400845 __be64 *lp;
846 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000847 int error;
848
849 error = gfs2_meta_inode_buffer(dip, &dibh);
850 if (error)
851 return error;
852
David Teiglandb3b94fa2006-01-16 16:50:04 +0000853 /* Turn over a new leaf */
854
Steven Whitehousec7526662006-03-20 12:30:04 -0500855 leaf = new_leaf(inode, &bh, 0);
856 if (!leaf)
857 return -ENOSPC;
858 bn = bh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000859
860 gfs2_assert(sdp, dip->i_di.di_entries < (1 << 16));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000861 leaf->lf_entries = cpu_to_be16(dip->i_di.di_entries);
862
863 /* Copy dirents */
864
865 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh,
866 sizeof(struct gfs2_dinode));
867
868 /* Find last entry */
869
870 x = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500871 args.len = bh->b_size - sizeof(struct gfs2_dinode) +
872 sizeof(struct gfs2_leaf);
873 args.name = bh->b_data;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400874 dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500875 gfs2_dirent_last, &args, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500876 if (!dent) {
877 brelse(bh);
878 brelse(dibh);
879 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000880 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500881 if (IS_ERR(dent)) {
882 brelse(bh);
883 brelse(dibh);
884 return PTR_ERR(dent);
885 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000886
887 /* Adjust the last dirent's record length
888 (Remember that dent still points to the last entry.) */
889
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000890 dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) +
David Teiglandb3b94fa2006-01-16 16:50:04 +0000891 sizeof(struct gfs2_dinode) -
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000892 sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000893
894 brelse(bh);
895
896 /* We're done with the new leaf block, now setup the new
897 hash table. */
898
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000899 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000900 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
901
Al Virob44b84d2006-10-14 10:46:30 -0400902 lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000903
904 for (x = sdp->sd_hash_ptrs; x--; lp++)
905 *lp = cpu_to_be64(bn);
906
907 dip->i_di.di_size = sdp->sd_sb.sb_bsize / 2;
908 dip->i_di.di_blocks++;
Steven Whitehouse9e2dbda2006-11-08 15:45:46 -0500909 gfs2_set_inode_blocks(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000910 dip->i_di.di_flags |= GFS2_DIF_EXHASH;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000911
912 for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
913 dip->i_di.di_depth = y;
914
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500915 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000916
917 brelse(dibh);
918
919 return 0;
920}
921
922/**
923 * dir_split_leaf - Split a leaf block into two
924 * @dip: The GFS2 inode
925 * @index:
926 * @leaf_no:
927 *
928 * Returns: 0 on success, error code on failure
929 */
930
Steven Whitehousec7526662006-03-20 12:30:04 -0500931static int dir_split_leaf(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000932{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400933 struct gfs2_inode *dip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000934 struct buffer_head *nbh, *obh, *dibh;
935 struct gfs2_leaf *nleaf, *oleaf;
Steven Whitehouse4da3c642006-07-11 13:19:13 -0400936 struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new;
Steven Whitehousecd915492006-09-04 12:49:07 -0400937 u32 start, len, half_len, divider;
Al Virob44b84d2006-10-14 10:46:30 -0400938 u64 bn, leaf_no;
939 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -0400940 u32 index;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000941 int x, moved = 0;
942 int error;
943
Steven Whitehousec7526662006-03-20 12:30:04 -0500944 index = name->hash >> (32 - dip->i_di.di_depth);
945 error = get_leaf_nr(dip, index, &leaf_no);
946 if (error)
947 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000948
949 /* Get the old leaf block */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000950 error = get_leaf(dip, leaf_no, &obh);
951 if (error)
Steven Whitehousee90deff2006-03-29 19:02:15 -0500952 return error;
953
954 oleaf = (struct gfs2_leaf *)obh->b_data;
955 if (dip->i_di.di_depth == be16_to_cpu(oleaf->lf_depth)) {
956 brelse(obh);
957 return 1; /* can't split */
958 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000960 gfs2_trans_add_bh(dip->i_gl, obh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961
Steven Whitehousec7526662006-03-20 12:30:04 -0500962 nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1);
963 if (!nleaf) {
964 brelse(obh);
965 return -ENOSPC;
966 }
967 bn = nbh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000968
Steven Whitehousec7526662006-03-20 12:30:04 -0500969 /* Compute the start and len of leaf pointers in the hash table. */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000970 len = 1 << (dip->i_di.di_depth - be16_to_cpu(oleaf->lf_depth));
971 half_len = len >> 1;
972 if (!half_len) {
Steven Whitehousee90deff2006-03-29 19:02:15 -0500973 printk(KERN_WARNING "di_depth %u lf_depth %u index %u\n", dip->i_di.di_depth, be16_to_cpu(oleaf->lf_depth), index);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000974 gfs2_consist_inode(dip);
975 error = -EIO;
976 goto fail_brelse;
977 }
978
979 start = (index & ~(len - 1));
980
981 /* Change the pointers.
982 Don't bother distinguishing stuffed from non-stuffed.
983 This code is complicated enough already. */
Al Virob44b84d2006-10-14 10:46:30 -0400984 lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985 /* Change the pointers */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000986 for (x = 0; x < half_len; x++)
987 lp[x] = cpu_to_be64(bn);
988
Steven Whitehousecd915492006-09-04 12:49:07 -0400989 error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64),
990 half_len * sizeof(u64));
991 if (error != half_len * sizeof(u64)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000992 if (error >= 0)
993 error = -EIO;
994 goto fail_lpfree;
995 }
996
997 kfree(lp);
998
999 /* Compute the divider */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001000 divider = (start + half_len) << (32 - dip->i_di.di_depth);
1001
1002 /* Copy the entries */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001003 dirent_first(dip, obh, &dent);
1004
1005 do {
1006 next = dent;
1007 if (dirent_next(dip, obh, &next))
1008 next = NULL;
1009
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -05001010 if (!gfs2_dirent_sentinel(dent) &&
David Teiglandb3b94fa2006-01-16 16:50:04 +00001011 be32_to_cpu(dent->de_hash) < divider) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001012 struct qstr str;
1013 str.name = (char*)(dent+1);
1014 str.len = be16_to_cpu(dent->de_name_len);
1015 str.hash = be32_to_cpu(dent->de_hash);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001016 new = gfs2_dirent_alloc(inode, nbh, &str);
Steven Whitehousec7526662006-03-20 12:30:04 -05001017 if (IS_ERR(new)) {
1018 error = PTR_ERR(new);
1019 break;
1020 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001021
1022 new->de_inum = dent->de_inum; /* No endian worries */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001023 new->de_type = dent->de_type; /* No endian worries */
Steven Whitehousec7526662006-03-20 12:30:04 -05001024 nleaf->lf_entries = cpu_to_be16(be16_to_cpu(nleaf->lf_entries)+1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001025
1026 dirent_del(dip, obh, prev, dent);
1027
1028 if (!oleaf->lf_entries)
1029 gfs2_consist_inode(dip);
Steven Whitehousec7526662006-03-20 12:30:04 -05001030 oleaf->lf_entries = cpu_to_be16(be16_to_cpu(oleaf->lf_entries)-1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001031
1032 if (!prev)
1033 prev = dent;
1034
1035 moved = 1;
Steven Whitehousec7526662006-03-20 12:30:04 -05001036 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001037 prev = dent;
Steven Whitehousec7526662006-03-20 12:30:04 -05001038 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001039 dent = next;
Steven Whitehousec7526662006-03-20 12:30:04 -05001040 } while (dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001041
Steven Whitehousec7526662006-03-20 12:30:04 -05001042 oleaf->lf_depth = nleaf->lf_depth;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001043
1044 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001045 if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001046 dip->i_di.di_blocks++;
Steven Whitehouse9e2dbda2006-11-08 15:45:46 -05001047 gfs2_set_inode_blocks(&dip->i_inode);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001048 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001049 brelse(dibh);
1050 }
1051
1052 brelse(obh);
1053 brelse(nbh);
1054
1055 return error;
1056
Steven Whitehousee90deff2006-03-29 19:02:15 -05001057fail_lpfree:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001058 kfree(lp);
1059
Steven Whitehousee90deff2006-03-29 19:02:15 -05001060fail_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001061 brelse(obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001062 brelse(nbh);
1063 return error;
1064}
1065
1066/**
1067 * dir_double_exhash - Double size of ExHash table
1068 * @dip: The GFS2 dinode
1069 *
1070 * Returns: 0 on success, error code on failure
1071 */
1072
1073static int dir_double_exhash(struct gfs2_inode *dip)
1074{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001075 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001076 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001077 u32 hsize;
1078 u64 *buf;
1079 u64 *from, *to;
1080 u64 block;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001081 int x;
1082 int error = 0;
1083
1084 hsize = 1 << dip->i_di.di_depth;
Steven Whitehousecd915492006-09-04 12:49:07 -04001085 if (hsize * sizeof(u64) != dip->i_di.di_size) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001086 gfs2_consist_inode(dip);
1087 return -EIO;
1088 }
1089
1090 /* Allocate both the "from" and "to" buffers in one big chunk */
1091
1092 buf = kcalloc(3, sdp->sd_hash_bsize, GFP_KERNEL | __GFP_NOFAIL);
1093
1094 for (block = dip->i_di.di_size >> sdp->sd_hash_bsize_shift; block--;) {
Steven Whitehousee13940b2006-01-30 13:31:50 +00001095 error = gfs2_dir_read_data(dip, (char *)buf,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001096 block * sdp->sd_hash_bsize,
Steven Whitehouse7276b3b2006-09-21 17:05:23 -04001097 sdp->sd_hash_bsize, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001098 if (error != sdp->sd_hash_bsize) {
1099 if (error >= 0)
1100 error = -EIO;
1101 goto fail;
1102 }
1103
1104 from = buf;
Steven Whitehousecd915492006-09-04 12:49:07 -04001105 to = (u64 *)((char *)buf + sdp->sd_hash_bsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001106
1107 for (x = sdp->sd_hash_ptrs; x--; from++) {
1108 *to++ = *from; /* No endianess worries */
1109 *to++ = *from;
1110 }
1111
Steven Whitehousee13940b2006-01-30 13:31:50 +00001112 error = gfs2_dir_write_data(dip,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001113 (char *)buf + sdp->sd_hash_bsize,
1114 block * sdp->sd_sb.sb_bsize,
1115 sdp->sd_sb.sb_bsize);
1116 if (error != sdp->sd_sb.sb_bsize) {
1117 if (error >= 0)
1118 error = -EIO;
1119 goto fail;
1120 }
1121 }
1122
1123 kfree(buf);
1124
1125 error = gfs2_meta_inode_buffer(dip, &dibh);
1126 if (!gfs2_assert_withdraw(sdp, !error)) {
1127 dip->i_di.di_depth++;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001128 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001129 brelse(dibh);
1130 }
1131
1132 return error;
1133
Steven Whitehousea91ea692006-09-04 12:04:26 -04001134fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001135 kfree(buf);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001136 return error;
1137}
1138
1139/**
1140 * compare_dents - compare directory entries by hash value
1141 * @a: first dent
1142 * @b: second dent
1143 *
1144 * When comparing the hash entries of @a to @b:
1145 * gt: returns 1
1146 * lt: returns -1
1147 * eq: returns 0
1148 */
1149
1150static int compare_dents(const void *a, const void *b)
1151{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001152 const struct gfs2_dirent *dent_a, *dent_b;
Steven Whitehousecd915492006-09-04 12:49:07 -04001153 u32 hash_a, hash_b;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001154 int ret = 0;
1155
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001156 dent_a = *(const struct gfs2_dirent **)a;
Steven Whitehousec7526662006-03-20 12:30:04 -05001157 hash_a = be32_to_cpu(dent_a->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001158
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001159 dent_b = *(const struct gfs2_dirent **)b;
Steven Whitehousec7526662006-03-20 12:30:04 -05001160 hash_b = be32_to_cpu(dent_b->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001161
1162 if (hash_a > hash_b)
1163 ret = 1;
1164 else if (hash_a < hash_b)
1165 ret = -1;
1166 else {
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001167 unsigned int len_a = be16_to_cpu(dent_a->de_name_len);
1168 unsigned int len_b = be16_to_cpu(dent_b->de_name_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001169
1170 if (len_a > len_b)
1171 ret = 1;
1172 else if (len_a < len_b)
1173 ret = -1;
1174 else
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001175 ret = memcmp(dent_a + 1, dent_b + 1, len_a);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001176 }
1177
1178 return ret;
1179}
1180
1181/**
1182 * do_filldir_main - read out directory entries
1183 * @dip: The GFS2 inode
1184 * @offset: The offset in the file to read from
1185 * @opaque: opaque data to pass to filldir
1186 * @filldir: The function to pass entries to
1187 * @darr: an array of struct gfs2_dirent pointers to read
1188 * @entries: the number of entries in darr
1189 * @copied: pointer to int that's non-zero if a entry has been copied out
1190 *
1191 * Jump through some hoops to make sure that if there are hash collsions,
1192 * they are read out at the beginning of a buffer. We want to minimize
1193 * the possibility that they will fall into different readdir buffers or
1194 * that someone will want to seek to that location.
1195 *
1196 * Returns: errno, >0 on exception from filldir
1197 */
1198
Steven Whitehousecd915492006-09-04 12:49:07 -04001199static int do_filldir_main(struct gfs2_inode *dip, u64 *offset,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001200 void *opaque, filldir_t filldir,
Steven Whitehousecd915492006-09-04 12:49:07 -04001201 const struct gfs2_dirent **darr, u32 entries,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001202 int *copied)
1203{
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001204 const struct gfs2_dirent *dent, *dent_next;
Steven Whitehousecd915492006-09-04 12:49:07 -04001205 u64 off, off_next;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001206 unsigned int x, y;
1207 int run = 0;
1208 int error = 0;
1209
1210 sort(darr, entries, sizeof(struct gfs2_dirent *), compare_dents, NULL);
1211
1212 dent_next = darr[0];
1213 off_next = be32_to_cpu(dent_next->de_hash);
1214 off_next = gfs2_disk_hash2offset(off_next);
1215
1216 for (x = 0, y = 1; x < entries; x++, y++) {
1217 dent = dent_next;
1218 off = off_next;
1219
1220 if (y < entries) {
1221 dent_next = darr[y];
1222 off_next = be32_to_cpu(dent_next->de_hash);
1223 off_next = gfs2_disk_hash2offset(off_next);
1224
1225 if (off < *offset)
1226 continue;
1227 *offset = off;
1228
1229 if (off_next == off) {
1230 if (*copied && !run)
1231 return 1;
1232 run = 1;
1233 } else
1234 run = 0;
1235 } else {
1236 if (off < *offset)
1237 continue;
1238 *offset = off;
1239 }
1240
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001241 error = filldir(opaque, (const char *)(dent + 1),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001242 be16_to_cpu(dent->de_name_len),
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001243 off, be64_to_cpu(dent->de_inum.no_addr),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001244 be16_to_cpu(dent->de_type));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001245 if (error)
1246 return 1;
1247
1248 *copied = 1;
1249 }
1250
1251 /* Increment the *offset by one, so the next time we come into the
1252 do_filldir fxn, we get the next entry instead of the last one in the
1253 current leaf */
1254
1255 (*offset)++;
1256
1257 return 0;
1258}
1259
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001260static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001261 filldir_t filldir, int *copied, unsigned *depth,
1262 u64 leaf_no)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001263{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001264 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001265 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001266 struct buffer_head *bh;
1267 struct gfs2_leaf *lf;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001268 unsigned entries = 0, entries2 = 0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001269 unsigned leaves = 0;
1270 const struct gfs2_dirent **darr, *dent;
1271 struct dirent_gather g;
1272 struct buffer_head **larr;
1273 int leaf = 0;
1274 int error, i;
1275 u64 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001276
David Teiglandb3b94fa2006-01-16 16:50:04 +00001277 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001278 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001279 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001280 goto out;
1281 lf = (struct gfs2_leaf *)bh->b_data;
1282 if (leaves == 0)
1283 *depth = be16_to_cpu(lf->lf_depth);
1284 entries += be16_to_cpu(lf->lf_entries);
1285 leaves++;
1286 lfn = be64_to_cpu(lf->lf_next);
1287 brelse(bh);
1288 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001289
1290 if (!entries)
1291 return 0;
1292
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001293 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001294 /*
1295 * The extra 99 entries are not normally used, but are a buffer
1296 * zone in case the number of entries in the leaf is corrupt.
1297 * 99 is the maximum number of entries that can fit in a single
1298 * leaf block.
1299 */
1300 larr = vmalloc((leaves + entries + 99) * sizeof(void *));
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001301 if (!larr)
1302 goto out;
1303 darr = (const struct gfs2_dirent **)(larr + leaves);
1304 g.pdent = darr;
1305 g.offset = 0;
1306 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001307
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001308 do {
1309 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001310 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001311 goto out_kfree;
1312 lf = (struct gfs2_leaf *)bh->b_data;
1313 lfn = be64_to_cpu(lf->lf_next);
1314 if (lf->lf_entries) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001315 entries2 += be16_to_cpu(lf->lf_entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001316 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
1317 gfs2_dirent_gather, NULL, &g);
1318 error = PTR_ERR(dent);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001319 if (IS_ERR(dent))
1320 goto out_kfree;
1321 if (entries2 != g.offset) {
akpm@linux-foundation.orgf391a4e2007-04-25 21:08:02 -07001322 fs_warn(sdp, "Number of entries corrupt in dir "
1323 "leaf %llu, entries2 (%u) != "
1324 "g.offset (%u)\n",
1325 (unsigned long long)bh->b_blocknr,
1326 entries2, g.offset);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001327
1328 error = -EIO;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001329 goto out_kfree;
1330 }
1331 error = 0;
1332 larr[leaf++] = bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001333 } else {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001334 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001335 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001336 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001337
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001338 BUG_ON(entries2 != entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001339 error = do_filldir_main(ip, offset, opaque, filldir, darr,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001340 entries, copied);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001341out_kfree:
1342 for(i = 0; i < leaf; i++)
1343 brelse(larr[i]);
Steven Whitehousefe1bded2006-04-18 10:09:15 -04001344 vfree(larr);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001345out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001346 return error;
1347}
1348
1349/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001350 * dir_e_read - Reads the entries from a directory into a filldir buffer
1351 * @dip: dinode pointer
1352 * @offset: the hash of the last entry read shifted to the right once
1353 * @opaque: buffer for the filldir function to fill
1354 * @filldir: points to the filldir function to use
1355 *
1356 * Returns: errno
1357 */
1358
Steven Whitehousecd915492006-09-04 12:49:07 -04001359static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001360 filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001361{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001362 struct gfs2_inode *dip = GFS2_I(inode);
1363 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousecd915492006-09-04 12:49:07 -04001364 u32 hsize, len = 0;
1365 u32 ht_offset, lp_offset, ht_offset_cur = -1;
1366 u32 hash, index;
Al Virob44b84d2006-10-14 10:46:30 -04001367 __be64 *lp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001368 int copied = 0;
1369 int error = 0;
Steven Whitehouse4da3c642006-07-11 13:19:13 -04001370 unsigned depth = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001371
1372 hsize = 1 << dip->i_di.di_depth;
Steven Whitehousecd915492006-09-04 12:49:07 -04001373 if (hsize * sizeof(u64) != dip->i_di.di_size) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001374 gfs2_consist_inode(dip);
1375 return -EIO;
1376 }
1377
1378 hash = gfs2_dir_offset2hash(*offset);
1379 index = hash >> (32 - dip->i_di.di_depth);
1380
1381 lp = kmalloc(sdp->sd_hash_bsize, GFP_KERNEL);
1382 if (!lp)
1383 return -ENOMEM;
1384
1385 while (index < hsize) {
1386 lp_offset = index & (sdp->sd_hash_ptrs - 1);
1387 ht_offset = index - lp_offset;
1388
1389 if (ht_offset_cur != ht_offset) {
Steven Whitehousee13940b2006-01-30 13:31:50 +00001390 error = gfs2_dir_read_data(dip, (char *)lp,
Al Virob44b84d2006-10-14 10:46:30 -04001391 ht_offset * sizeof(__be64),
Steven Whitehouse7276b3b2006-09-21 17:05:23 -04001392 sdp->sd_hash_bsize, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001393 if (error != sdp->sd_hash_bsize) {
1394 if (error >= 0)
1395 error = -EIO;
1396 goto out;
1397 }
1398 ht_offset_cur = ht_offset;
1399 }
1400
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001401 error = gfs2_dir_read_leaf(inode, offset, opaque, filldir,
1402 &copied, &depth,
1403 be64_to_cpu(lp[lp_offset]));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001404 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001405 break;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001406
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001407 len = 1 << (dip->i_di.di_depth - depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001408 index = (index & ~(len - 1)) + len;
1409 }
1410
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001411out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001412 kfree(lp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001413 if (error > 0)
1414 error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001415 return error;
1416}
1417
Steven Whitehousecd915492006-09-04 12:49:07 -04001418int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001419 filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001420{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001421 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001422 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001423 struct dirent_gather g;
1424 const struct gfs2_dirent **darr, *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001425 struct buffer_head *dibh;
1426 int copied = 0;
1427 int error;
1428
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001429 if (!dip->i_di.di_entries)
1430 return 0;
1431
1432 if (dip->i_di.di_flags & GFS2_DIF_EXHASH)
1433 return dir_e_read(inode, offset, opaque, filldir);
1434
David Teiglandb3b94fa2006-01-16 16:50:04 +00001435 if (!gfs2_is_stuffed(dip)) {
1436 gfs2_consist_inode(dip);
1437 return -EIO;
1438 }
1439
David Teiglandb3b94fa2006-01-16 16:50:04 +00001440 error = gfs2_meta_inode_buffer(dip, &dibh);
1441 if (error)
1442 return error;
1443
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001444 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001445 /* 96 is max number of dirents which can be stuffed into an inode */
1446 darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_KERNEL);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001447 if (darr) {
1448 g.pdent = darr;
1449 g.offset = 0;
1450 dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size,
1451 gfs2_dirent_gather, NULL, &g);
1452 if (IS_ERR(dent)) {
1453 error = PTR_ERR(dent);
1454 goto out;
1455 }
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001456 if (dip->i_di.di_entries != g.offset) {
1457 fs_warn(sdp, "Number of entries corrupt in dir %llu, "
1458 "ip->i_di.di_entries (%u) != g.offset (%u)\n",
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001459 (unsigned long long)dip->i_no_addr,
akpm@linux-foundation.orgf391a4e2007-04-25 21:08:02 -07001460 dip->i_di.di_entries,
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001461 g.offset);
1462 error = -EIO;
1463 goto out;
1464 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001465 error = do_filldir_main(dip, offset, opaque, filldir, darr,
1466 dip->i_di.di_entries, &copied);
1467out:
1468 kfree(darr);
1469 }
1470
David Teiglandb3b94fa2006-01-16 16:50:04 +00001471 if (error > 0)
1472 error = 0;
1473
1474 brelse(dibh);
1475
1476 return error;
1477}
1478
David Teiglandb3b94fa2006-01-16 16:50:04 +00001479/**
1480 * gfs2_dir_search - Search a directory
1481 * @dip: The GFS2 inode
1482 * @filename:
1483 * @inode:
1484 *
1485 * This routine searches a directory for a file or another directory.
1486 * Assumes a glock is held on dip.
1487 *
1488 * Returns: errno
1489 */
1490
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001491struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001492{
Steven Whitehousec7526662006-03-20 12:30:04 -05001493 struct buffer_head *bh;
1494 struct gfs2_dirent *dent;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001495 struct inode *inode;
1496
1497 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1498 if (dent) {
1499 if (IS_ERR(dent))
1500 return ERR_PTR(PTR_ERR(dent));
Wendy Chengbb9bcf02007-06-27 17:07:08 -04001501 inode = gfs2_inode_lookup(dir->i_sb,
1502 be16_to_cpu(dent->de_type),
1503 be64_to_cpu(dent->de_inum.no_addr),
1504 be64_to_cpu(dent->de_inum.no_formal_ino));
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001505 brelse(bh);
1506 return inode;
1507 }
1508 return ERR_PTR(-ENOENT);
1509}
1510
1511int gfs2_dir_check(struct inode *dir, const struct qstr *name,
1512 const struct gfs2_inode *ip)
1513{
1514 struct buffer_head *bh;
1515 struct gfs2_dirent *dent;
1516 int ret = -ENOENT;
Steven Whitehousec7526662006-03-20 12:30:04 -05001517
1518 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1519 if (dent) {
1520 if (IS_ERR(dent))
1521 return PTR_ERR(dent);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001522 if (ip) {
1523 if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr)
1524 goto out;
1525 if (be64_to_cpu(dent->de_inum.no_formal_ino) !=
1526 ip->i_no_formal_ino)
1527 goto out;
1528 if (unlikely(IF2DT(ip->i_inode.i_mode) !=
1529 be16_to_cpu(dent->de_type))) {
1530 gfs2_consist_inode(GFS2_I(dir));
1531 ret = -EIO;
1532 goto out;
1533 }
1534 }
1535 ret = 0;
1536out:
Steven Whitehousec7526662006-03-20 12:30:04 -05001537 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001538 }
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001539 return ret;
Steven Whitehousec7526662006-03-20 12:30:04 -05001540}
1541
1542static int dir_new_leaf(struct inode *inode, const struct qstr *name)
1543{
1544 struct buffer_head *bh, *obh;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001545 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001546 struct gfs2_leaf *leaf, *oleaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001547 int error;
Steven Whitehousec7526662006-03-20 12:30:04 -05001548 u32 index;
1549 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001550
Steven Whitehousec7526662006-03-20 12:30:04 -05001551 index = name->hash >> (32 - ip->i_di.di_depth);
1552 error = get_first_leaf(ip, index, &obh);
1553 if (error)
1554 return error;
1555 do {
1556 oleaf = (struct gfs2_leaf *)obh->b_data;
1557 bn = be64_to_cpu(oleaf->lf_next);
1558 if (!bn)
1559 break;
1560 brelse(obh);
1561 error = get_leaf(ip, bn, &obh);
1562 if (error)
1563 return error;
1564 } while(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001565
Steven Whitehousec7526662006-03-20 12:30:04 -05001566 gfs2_trans_add_bh(ip->i_gl, obh, 1);
1567
1568 leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth));
1569 if (!leaf) {
1570 brelse(obh);
1571 return -ENOSPC;
1572 }
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001573 oleaf->lf_next = cpu_to_be64(bh->b_blocknr);
Steven Whitehousec7526662006-03-20 12:30:04 -05001574 brelse(bh);
1575 brelse(obh);
1576
1577 error = gfs2_meta_inode_buffer(ip, &bh);
1578 if (error)
1579 return error;
1580 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1581 ip->i_di.di_blocks++;
Steven Whitehouse9e2dbda2006-11-08 15:45:46 -05001582 gfs2_set_inode_blocks(&ip->i_inode);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001583 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001584 brelse(bh);
1585 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001586}
1587
1588/**
1589 * gfs2_dir_add - Add new filename into directory
1590 * @dip: The GFS2 inode
1591 * @filename: The new name
1592 * @inode: The inode number of the entry
1593 * @type: The type of the entry
1594 *
1595 * Returns: 0 on success, error code on failure
1596 */
1597
Steven Whitehousec7526662006-03-20 12:30:04 -05001598int gfs2_dir_add(struct inode *inode, const struct qstr *name,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001599 const struct gfs2_inode *nip, unsigned type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001600{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001601 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001602 struct buffer_head *bh;
1603 struct gfs2_dirent *dent;
1604 struct gfs2_leaf *leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001605 int error;
1606
Steven Whitehousec7526662006-03-20 12:30:04 -05001607 while(1) {
1608 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space,
1609 &bh);
1610 if (dent) {
1611 if (IS_ERR(dent))
1612 return PTR_ERR(dent);
1613 dent = gfs2_init_dirent(inode, dent, name, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001614 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001615 dent->de_type = cpu_to_be16(type);
1616 if (ip->i_di.di_flags & GFS2_DIF_EXHASH) {
1617 leaf = (struct gfs2_leaf *)bh->b_data;
1618 leaf->lf_entries = cpu_to_be16(be16_to_cpu(leaf->lf_entries) + 1);
1619 }
1620 brelse(bh);
1621 error = gfs2_meta_inode_buffer(ip, &bh);
1622 if (error)
1623 break;
1624 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1625 ip->i_di.di_entries++;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001626 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001627 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001628 brelse(bh);
1629 error = 0;
1630 break;
1631 }
1632 if (!(ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
1633 error = dir_make_exhash(inode);
1634 if (error)
1635 break;
1636 continue;
1637 }
1638 error = dir_split_leaf(inode, name);
1639 if (error == 0)
1640 continue;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001641 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001642 break;
1643 if (ip->i_di.di_depth < GFS2_DIR_MAX_DEPTH) {
1644 error = dir_double_exhash(ip);
1645 if (error)
1646 break;
1647 error = dir_split_leaf(inode, name);
Steven Whitehousee90deff2006-03-29 19:02:15 -05001648 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001649 break;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001650 if (error == 0)
1651 continue;
Steven Whitehousec7526662006-03-20 12:30:04 -05001652 }
1653 error = dir_new_leaf(inode, name);
1654 if (!error)
1655 continue;
1656 error = -ENOSPC;
1657 break;
1658 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001659 return error;
1660}
1661
Steven Whitehousec7526662006-03-20 12:30:04 -05001662
David Teiglandb3b94fa2006-01-16 16:50:04 +00001663/**
1664 * gfs2_dir_del - Delete a directory entry
1665 * @dip: The GFS2 inode
1666 * @filename: The filename
1667 *
1668 * Returns: 0 on success, error code on failure
1669 */
1670
Steven Whitehousec7526662006-03-20 12:30:04 -05001671int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001672{
Steven Whitehousec7526662006-03-20 12:30:04 -05001673 struct gfs2_dirent *dent, *prev = NULL;
1674 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001675 int error;
1676
Steven Whitehousec7526662006-03-20 12:30:04 -05001677 /* Returns _either_ the entry (if its first in block) or the
1678 previous entry otherwise */
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001679 dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001680 if (!dent) {
1681 gfs2_consist_inode(dip);
1682 return -EIO;
1683 }
1684 if (IS_ERR(dent)) {
1685 gfs2_consist_inode(dip);
1686 return PTR_ERR(dent);
1687 }
1688 /* If not first in block, adjust pointers accordingly */
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001689 if (gfs2_dirent_find(dent, name, NULL) == 0) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001690 prev = dent;
1691 dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len));
1692 }
1693
1694 dirent_del(dip, bh, prev, dent);
1695 if (dip->i_di.di_flags & GFS2_DIF_EXHASH) {
1696 struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
1697 u16 entries = be16_to_cpu(leaf->lf_entries);
1698 if (!entries)
1699 gfs2_consist_inode(dip);
1700 leaf->lf_entries = cpu_to_be16(--entries);
Steven Whitehousec7526662006-03-20 12:30:04 -05001701 }
Steven Whitehouseed386502006-04-07 16:28:07 -04001702 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001703
1704 error = gfs2_meta_inode_buffer(dip, &bh);
1705 if (error)
1706 return error;
1707
1708 if (!dip->i_di.di_entries)
1709 gfs2_consist_inode(dip);
1710 gfs2_trans_add_bh(dip->i_gl, bh, 1);
1711 dip->i_di.di_entries--;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001712 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001713 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001714 brelse(bh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001715 mark_inode_dirty(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001716
1717 return error;
1718}
1719
David Teiglandb3b94fa2006-01-16 16:50:04 +00001720/**
1721 * gfs2_dir_mvino - Change inode number of directory entry
1722 * @dip: The GFS2 inode
1723 * @filename:
1724 * @new_inode:
1725 *
1726 * This routine changes the inode number of a directory entry. It's used
1727 * by rename to change ".." when a directory is moved.
1728 * Assumes a glock is held on dvp.
1729 *
1730 * Returns: errno
1731 */
1732
Steven Whitehousec7526662006-03-20 12:30:04 -05001733int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001734 const struct gfs2_inode *nip, unsigned int new_type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001735{
Steven Whitehousec7526662006-03-20 12:30:04 -05001736 struct buffer_head *bh;
1737 struct gfs2_dirent *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001738 int error;
1739
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001740 dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001741 if (!dent) {
1742 gfs2_consist_inode(dip);
1743 return -EIO;
1744 }
1745 if (IS_ERR(dent))
1746 return PTR_ERR(dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001747
Steven Whitehousec7526662006-03-20 12:30:04 -05001748 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001749 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001750 dent->de_type = cpu_to_be16(new_type);
1751
1752 if (dip->i_di.di_flags & GFS2_DIF_EXHASH) {
1753 brelse(bh);
1754 error = gfs2_meta_inode_buffer(dip, &bh);
1755 if (error)
1756 return error;
1757 gfs2_trans_add_bh(dip->i_gl, bh, 1);
1758 }
1759
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001760 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001761 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001762 brelse(bh);
1763 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001764}
1765
1766/**
1767 * foreach_leaf - call a function for each leaf in a directory
1768 * @dip: the directory
1769 * @lc: the function to call for each each
1770 * @data: private data to pass to it
1771 *
1772 * Returns: errno
1773 */
1774
1775static int foreach_leaf(struct gfs2_inode *dip, leaf_call_t lc, void *data)
1776{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001777 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001778 struct buffer_head *bh;
Steven Whitehousec7526662006-03-20 12:30:04 -05001779 struct gfs2_leaf *leaf;
Steven Whitehousecd915492006-09-04 12:49:07 -04001780 u32 hsize, len;
1781 u32 ht_offset, lp_offset, ht_offset_cur = -1;
1782 u32 index = 0;
Al Virob44b84d2006-10-14 10:46:30 -04001783 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -04001784 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001785 int error = 0;
1786
1787 hsize = 1 << dip->i_di.di_depth;
Steven Whitehousecd915492006-09-04 12:49:07 -04001788 if (hsize * sizeof(u64) != dip->i_di.di_size) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001789 gfs2_consist_inode(dip);
1790 return -EIO;
1791 }
1792
1793 lp = kmalloc(sdp->sd_hash_bsize, GFP_KERNEL);
1794 if (!lp)
1795 return -ENOMEM;
1796
1797 while (index < hsize) {
1798 lp_offset = index & (sdp->sd_hash_ptrs - 1);
1799 ht_offset = index - lp_offset;
1800
1801 if (ht_offset_cur != ht_offset) {
Steven Whitehousee13940b2006-01-30 13:31:50 +00001802 error = gfs2_dir_read_data(dip, (char *)lp,
Al Virob44b84d2006-10-14 10:46:30 -04001803 ht_offset * sizeof(__be64),
Steven Whitehouse7276b3b2006-09-21 17:05:23 -04001804 sdp->sd_hash_bsize, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001805 if (error != sdp->sd_hash_bsize) {
1806 if (error >= 0)
1807 error = -EIO;
1808 goto out;
1809 }
1810 ht_offset_cur = ht_offset;
1811 }
1812
1813 leaf_no = be64_to_cpu(lp[lp_offset]);
1814 if (leaf_no) {
1815 error = get_leaf(dip, leaf_no, &bh);
1816 if (error)
1817 goto out;
Steven Whitehousec7526662006-03-20 12:30:04 -05001818 leaf = (struct gfs2_leaf *)bh->b_data;
Steven Whitehousec7526662006-03-20 12:30:04 -05001819 len = 1 << (dip->i_di.di_depth - be16_to_cpu(leaf->lf_depth));
Steven Whitehouse634ee0b2006-07-17 09:32:37 -04001820 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001821
1822 error = lc(dip, index, len, leaf_no, data);
1823 if (error)
1824 goto out;
1825
1826 index = (index & ~(len - 1)) + len;
1827 } else
1828 index++;
1829 }
1830
1831 if (index != hsize) {
1832 gfs2_consist_inode(dip);
1833 error = -EIO;
1834 }
1835
Steven Whitehouse634ee0b2006-07-17 09:32:37 -04001836out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001837 kfree(lp);
1838
1839 return error;
1840}
1841
1842/**
1843 * leaf_dealloc - Deallocate a directory leaf
1844 * @dip: the directory
1845 * @index: the hash table offset in the directory
1846 * @len: the number of pointers to this leaf
1847 * @leaf_no: the leaf number
1848 * @data: not used
1849 *
1850 * Returns: errno
1851 */
1852
Steven Whitehousecd915492006-09-04 12:49:07 -04001853static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
1854 u64 leaf_no, void *data)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001855{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001856 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001857 struct gfs2_leaf *tmp_leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001858 struct gfs2_rgrp_list rlist;
1859 struct buffer_head *bh, *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001860 u64 blk, nblk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001861 unsigned int rg_blocks = 0, l_blocks = 0;
1862 char *ht;
Steven Whitehousecd915492006-09-04 12:49:07 -04001863 unsigned int x, size = len * sizeof(u64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001864 int error;
1865
1866 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1867
1868 ht = kzalloc(size, GFP_KERNEL);
1869 if (!ht)
1870 return -ENOMEM;
1871
1872 gfs2_alloc_get(dip);
1873
1874 error = gfs2_quota_hold(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1875 if (error)
1876 goto out;
1877
1878 error = gfs2_rindex_hold(sdp, &dip->i_alloc.al_ri_gh);
1879 if (error)
1880 goto out_qs;
1881
1882 /* Count the number of leaves */
1883
Steven Whitehousec7526662006-03-20 12:30:04 -05001884 for (blk = leaf_no; blk; blk = nblk) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001885 error = get_leaf(dip, blk, &bh);
1886 if (error)
1887 goto out_rlist;
Steven Whitehousec7526662006-03-20 12:30:04 -05001888 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1889 nblk = be64_to_cpu(tmp_leaf->lf_next);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001890 brelse(bh);
1891
1892 gfs2_rlist_add(sdp, &rlist, blk);
1893 l_blocks++;
1894 }
1895
1896 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
1897
1898 for (x = 0; x < rlist.rl_rgrps; x++) {
1899 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001900 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001901 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001902 }
1903
1904 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1905 if (error)
1906 goto out_rlist;
1907
1908 error = gfs2_trans_begin(sdp,
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001909 rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) +
David Teiglandb3b94fa2006-01-16 16:50:04 +00001910 RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks);
1911 if (error)
1912 goto out_rg_gunlock;
1913
Steven Whitehousec7526662006-03-20 12:30:04 -05001914 for (blk = leaf_no; blk; blk = nblk) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001915 error = get_leaf(dip, blk, &bh);
1916 if (error)
1917 goto out_end_trans;
Steven Whitehousec7526662006-03-20 12:30:04 -05001918 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1919 nblk = be64_to_cpu(tmp_leaf->lf_next);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001920 brelse(bh);
1921
1922 gfs2_free_meta(dip, blk, 1);
1923
1924 if (!dip->i_di.di_blocks)
1925 gfs2_consist_inode(dip);
1926 dip->i_di.di_blocks--;
Steven Whitehouse9e2dbda2006-11-08 15:45:46 -05001927 gfs2_set_inode_blocks(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001928 }
1929
Steven Whitehousecd915492006-09-04 12:49:07 -04001930 error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001931 if (error != size) {
1932 if (error >= 0)
1933 error = -EIO;
1934 goto out_end_trans;
1935 }
1936
1937 error = gfs2_meta_inode_buffer(dip, &dibh);
1938 if (error)
1939 goto out_end_trans;
1940
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001941 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001942 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001943 brelse(dibh);
1944
Steven Whitehousea91ea692006-09-04 12:04:26 -04001945out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001946 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001947out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001948 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001949out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001950 gfs2_rlist_free(&rlist);
1951 gfs2_glock_dq_uninit(&dip->i_alloc.al_ri_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001952out_qs:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001953 gfs2_quota_unhold(dip);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001954out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001955 gfs2_alloc_put(dip);
1956 kfree(ht);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001957 return error;
1958}
1959
1960/**
1961 * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory
1962 * @dip: the directory
1963 *
1964 * Dealloc all on-disk directory leaves to FREEMETA state
1965 * Change on-disk inode type to "regular file"
1966 *
1967 * Returns: errno
1968 */
1969
1970int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
1971{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001972 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001973 struct buffer_head *bh;
1974 int error;
1975
1976 /* Dealloc on-disk leaves to FREEMETA state */
1977 error = foreach_leaf(dip, leaf_dealloc, NULL);
1978 if (error)
1979 return error;
1980
1981 /* Make this a regular file in case we crash.
1982 (We don't want to free these blocks a second time.) */
1983
1984 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1985 if (error)
1986 return error;
1987
1988 error = gfs2_meta_inode_buffer(dip, &bh);
1989 if (!error) {
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001990 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehouse568f4c92006-02-27 12:00:42 -05001991 ((struct gfs2_dinode *)bh->b_data)->di_mode =
1992 cpu_to_be32(S_IFREG);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001993 brelse(bh);
1994 }
1995
1996 gfs2_trans_end(sdp);
1997
1998 return error;
1999}
2000
2001/**
2002 * gfs2_diradd_alloc_required - find if adding entry will require an allocation
2003 * @ip: the file being written to
2004 * @filname: the filename that's going to be added
David Teiglandb3b94fa2006-01-16 16:50:04 +00002005 *
Steven Whitehousec7526662006-03-20 12:30:04 -05002006 * Returns: 1 if alloc required, 0 if not, -ve on error
David Teiglandb3b94fa2006-01-16 16:50:04 +00002007 */
2008
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04002009int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00002010{
Steven Whitehousec7526662006-03-20 12:30:04 -05002011 struct gfs2_dirent *dent;
2012 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002013
Steven Whitehousec7526662006-03-20 12:30:04 -05002014 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh);
Steven Whitehouseed386502006-04-07 16:28:07 -04002015 if (!dent) {
Steven Whitehousec7526662006-03-20 12:30:04 -05002016 return 1;
Steven Whitehouseed386502006-04-07 16:28:07 -04002017 }
Steven Whitehousec7526662006-03-20 12:30:04 -05002018 if (IS_ERR(dent))
2019 return PTR_ERR(dent);
2020 brelse(bh);
2021 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002022}
2023