blob: 25fddc100f18959882e24f730085ead9916818c9 [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 Whitehouse907b9bc2006-09-25 09:26:04 -040082typedef int (*leaf_call_t) (struct gfs2_inode *dip, u32 index, u32 len,
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040083 u64 leaf_no, void *data);
84typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent,
85 const struct qstr *name, void *opaque);
David Teiglandb3b94fa2006-01-16 16:50:04 +000086
Steven Whitehouse61e085a2006-04-24 10:07:13 -040087
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 Whitehousec9e98882008-11-04 09:47:33 +0000130 if (ip->i_disksize < offset + size)
131 ip->i_disksize = 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 Whitehousec9e98882008-11-04 09:47:33 +0000228 if (ip->i_disksize < offset + copied)
229 ip->i_disksize = 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;
278
Steven Whitehousec9e98882008-11-04 09:47:33 +0000279 if (offset >= ip->i_disksize)
Steven Whitehousee13940b2006-01-30 13:31:50 +0000280 return 0;
281
Steven Whitehousec9e98882008-11-04 09:47:33 +0000282 if (offset + size > ip->i_disksize)
283 size = ip->i_disksize - offset;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000284
285 if (!size)
286 return 0;
287
288 if (gfs2_is_stuffed(ip))
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400289 return gfs2_dir_read_stuffed(ip, buf, offset, size);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000290
291 if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip)))
292 return -EINVAL;
293
294 lblock = offset;
295 o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header);
296
297 while (copied < size) {
298 unsigned int amount;
299 struct buffer_head *bh;
300 int new;
301
302 amount = size - copied;
303 if (amount > sdp->sd_sb.sb_bsize - o)
304 amount = sdp->sd_sb.sb_bsize - o;
305
306 if (!extlen) {
307 new = 0;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400308 error = gfs2_extent_map(&ip->i_inode, lblock, &new,
Steven Whitehousefd88de562006-05-05 16:59:11 -0400309 &dblock, &extlen);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400310 if (error || !dblock)
311 goto fail;
312 BUG_ON(extlen < 1);
313 if (!ra)
314 extlen = 1;
315 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
Adrian Bunkb7d8ac32006-10-19 16:02:07 +0200316 } else {
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400317 error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, &bh);
Steven Whitehousee13940b2006-01-30 13:31:50 +0000318 if (error)
319 goto fail;
320 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400321 error = gfs2_metatype_check(sdp, bh, GFS2_METATYPE_JD);
322 if (error) {
323 brelse(bh);
324 goto fail;
325 }
326 dblock++;
327 extlen--;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000328 memcpy(buf, bh->b_data + o, amount);
329 brelse(bh);
Steven Whitehouse899bb262006-08-01 15:28:57 -0400330 buf += amount;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000331 copied += amount;
332 lblock++;
Steven Whitehousee13940b2006-01-30 13:31:50 +0000333 o = sizeof(struct gfs2_meta_header);
334 }
335
336 return copied;
337fail:
338 return (copied) ? copied : error;
339}
340
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500341static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent)
342{
343 return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0;
344}
345
Steven Whitehousec7526662006-03-20 12:30:04 -0500346static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent,
347 const struct qstr *name, int ret)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000348{
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500349 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500350 be32_to_cpu(dent->de_hash) == name->hash &&
351 be16_to_cpu(dent->de_name_len) == name->len &&
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400352 memcmp(dent+1, name->name, name->len) == 0)
Steven Whitehousec7526662006-03-20 12:30:04 -0500353 return ret;
354 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000355}
356
Steven Whitehousec7526662006-03-20 12:30:04 -0500357static int gfs2_dirent_find(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500358 const struct qstr *name,
359 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500360{
361 return __gfs2_dirent_find(dent, name, 1);
362}
363
364static int gfs2_dirent_prev(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500365 const struct qstr *name,
366 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500367{
368 return __gfs2_dirent_find(dent, name, 2);
369}
370
371/*
372 * name->name holds ptr to start of block.
373 * name->len holds size of block.
374 */
375static int gfs2_dirent_last(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500376 const struct qstr *name,
377 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500378{
379 const char *start = name->name;
380 const char *end = (const char *)dent + be16_to_cpu(dent->de_rec_len);
381 if (name->len == (end - start))
382 return 1;
383 return 0;
384}
385
386static int gfs2_dirent_find_space(const struct gfs2_dirent *dent,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500387 const struct qstr *name,
388 void *opaque)
Steven Whitehousec7526662006-03-20 12:30:04 -0500389{
390 unsigned required = GFS2_DIRENT_SIZE(name->len);
391 unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
392 unsigned totlen = be16_to_cpu(dent->de_rec_len);
393
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500394 if (gfs2_dirent_sentinel(dent))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500395 actual = GFS2_DIRENT_SIZE(0);
Jan Engelhardtc53921242006-09-05 14:30:40 +0200396 if (totlen - actual >= required)
Steven Whitehousec7526662006-03-20 12:30:04 -0500397 return 1;
398 return 0;
399}
400
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500401struct dirent_gather {
402 const struct gfs2_dirent **pdent;
403 unsigned offset;
404};
405
406static int gfs2_dirent_gather(const struct gfs2_dirent *dent,
407 const struct qstr *name,
408 void *opaque)
409{
410 struct dirent_gather *g = opaque;
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500411 if (!gfs2_dirent_sentinel(dent)) {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500412 g->pdent[g->offset++] = dent;
413 }
414 return 0;
415}
416
Steven Whitehousec7526662006-03-20 12:30:04 -0500417/*
418 * Other possible things to check:
419 * - Inode located within filesystem size (and on valid block)
420 * - Valid directory entry type
421 * Not sure how heavy-weight we want to make this... could also check
422 * hash is correct for example, but that would take a lot of extra time.
423 * For now the most important thing is to check that the various sizes
424 * are correct.
425 */
426static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset,
427 unsigned int size, unsigned int len, int first)
428{
429 const char *msg = "gfs2_dirent too small";
430 if (unlikely(size < sizeof(struct gfs2_dirent)))
431 goto error;
432 msg = "gfs2_dirent misaligned";
433 if (unlikely(offset & 0x7))
434 goto error;
435 msg = "gfs2_dirent points beyond end of block";
436 if (unlikely(offset + size > len))
437 goto error;
438 msg = "zero inode number";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500439 if (unlikely(!first && gfs2_dirent_sentinel(dent)))
Steven Whitehousec7526662006-03-20 12:30:04 -0500440 goto error;
441 msg = "name length is greater than space in dirent";
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500442 if (!gfs2_dirent_sentinel(dent) &&
Steven Whitehousec7526662006-03-20 12:30:04 -0500443 unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) >
444 size))
445 goto error;
446 return 0;
447error:
448 printk(KERN_WARNING "gfs2_check_dirent: %s (%s)\n", msg,
449 first ? "first in block" : "not first in block");
450 return -EIO;
451}
452
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500453static int gfs2_dirent_offset(const void *buf)
Steven Whitehousec7526662006-03-20 12:30:04 -0500454{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500455 const struct gfs2_meta_header *h = buf;
456 int offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500457
458 BUG_ON(buf == NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500459
Steven Whitehousee3167de2006-03-30 15:46:23 -0500460 switch(be32_to_cpu(h->mh_type)) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500461 case GFS2_METATYPE_LF:
462 offset = sizeof(struct gfs2_leaf);
463 break;
464 case GFS2_METATYPE_DI:
465 offset = sizeof(struct gfs2_dinode);
466 break;
467 default:
468 goto wrong_type;
469 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500470 return offset;
471wrong_type:
472 printk(KERN_WARNING "gfs2_scan_dirent: wrong block type %u\n",
Steven Whitehousee3167de2006-03-30 15:46:23 -0500473 be32_to_cpu(h->mh_type));
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500474 return -1;
475}
Steven Whitehousec7526662006-03-20 12:30:04 -0500476
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400477static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500478 unsigned int len, gfs2_dscan_t scan,
479 const struct qstr *name,
480 void *opaque)
481{
482 struct gfs2_dirent *dent, *prev;
483 unsigned offset;
484 unsigned size;
485 int ret = 0;
486
487 ret = gfs2_dirent_offset(buf);
488 if (ret < 0)
489 goto consist_inode;
490
491 offset = ret;
Steven Whitehousec7526662006-03-20 12:30:04 -0500492 prev = NULL;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400493 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500494 size = be16_to_cpu(dent->de_rec_len);
495 if (gfs2_check_dirent(dent, offset, size, len, 1))
496 goto consist_inode;
497 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500498 ret = scan(dent, name, opaque);
Steven Whitehousec7526662006-03-20 12:30:04 -0500499 if (ret)
500 break;
501 offset += size;
502 if (offset == len)
503 break;
504 prev = dent;
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400505 dent = buf + offset;
Steven Whitehousec7526662006-03-20 12:30:04 -0500506 size = be16_to_cpu(dent->de_rec_len);
507 if (gfs2_check_dirent(dent, offset, size, len, 0))
508 goto consist_inode;
509 } while(1);
510
511 switch(ret) {
512 case 0:
513 return NULL;
514 case 1:
515 return dent;
516 case 2:
517 return prev ? prev : dent;
518 default:
519 BUG_ON(ret > 0);
520 return ERR_PTR(ret);
521 }
522
Steven Whitehousec7526662006-03-20 12:30:04 -0500523consist_inode:
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400524 gfs2_consist_inode(GFS2_I(inode));
Steven Whitehousec7526662006-03-20 12:30:04 -0500525 return ERR_PTR(-EIO);
526}
527
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400528static int dirent_check_reclen(struct gfs2_inode *dip,
529 const struct gfs2_dirent *d, const void *end_p)
530{
531 const void *ptr = d;
532 u16 rec_len = be16_to_cpu(d->de_rec_len);
533
534 if (unlikely(rec_len < sizeof(struct gfs2_dirent)))
535 goto broken;
536 ptr += rec_len;
537 if (ptr < end_p)
538 return rec_len;
539 if (ptr == end_p)
540 return -ENOENT;
541broken:
542 gfs2_consist_inode(dip);
543 return -EIO;
544}
545
David Teiglandb3b94fa2006-01-16 16:50:04 +0000546/**
547 * dirent_next - Next dirent
548 * @dip: the directory
549 * @bh: The buffer
550 * @dent: Pointer to list of dirents
551 *
552 * Returns: 0 on success, error code otherwise
553 */
554
555static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh,
556 struct gfs2_dirent **dent)
557{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400558 struct gfs2_dirent *cur = *dent, *tmp;
559 char *bh_end = bh->b_data + bh->b_size;
560 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000561
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400562 ret = dirent_check_reclen(dip, cur, bh_end);
563 if (ret < 0)
564 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000565
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400566 tmp = (void *)cur + ret;
567 ret = dirent_check_reclen(dip, tmp, bh_end);
568 if (ret == -EIO)
569 return ret;
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000570
David Teiglandb3b94fa2006-01-16 16:50:04 +0000571 /* Only the first dent could ever have de_inum.no_addr == 0 */
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500572 if (gfs2_dirent_sentinel(tmp)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000573 gfs2_consist_inode(dip);
574 return -EIO;
575 }
576
577 *dent = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000578 return 0;
579}
580
581/**
582 * dirent_del - Delete a dirent
583 * @dip: The GFS2 inode
584 * @bh: The buffer
585 * @prev: The previous dirent
586 * @cur: The current dirent
587 *
588 */
589
590static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh,
591 struct gfs2_dirent *prev, struct gfs2_dirent *cur)
592{
Steven Whitehousecd915492006-09-04 12:49:07 -0400593 u16 cur_rec_len, prev_rec_len;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000594
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500595 if (gfs2_dirent_sentinel(cur)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000596 gfs2_consist_inode(dip);
597 return;
598 }
599
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000600 gfs2_trans_add_bh(dip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000601
602 /* If there is no prev entry, this is the first entry in the block.
603 The de_rec_len is already as big as it needs to be. Just zero
604 out the inode number and return. */
605
606 if (!prev) {
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500607 cur->de_inum.no_addr = 0;
608 cur->de_inum.no_formal_ino = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000609 return;
610 }
611
612 /* Combine this dentry with the previous one. */
613
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000614 prev_rec_len = be16_to_cpu(prev->de_rec_len);
615 cur_rec_len = be16_to_cpu(cur->de_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000616
617 if ((char *)prev + prev_rec_len != (char *)cur)
618 gfs2_consist_inode(dip);
619 if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size)
620 gfs2_consist_inode(dip);
621
622 prev_rec_len += cur_rec_len;
Steven Whitehousefc69d0d2006-02-13 16:21:47 +0000623 prev->de_rec_len = cpu_to_be16(prev_rec_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000624}
625
Steven Whitehousec7526662006-03-20 12:30:04 -0500626/*
627 * Takes a dent from which to grab space as an argument. Returns the
628 * newly created dent.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000629 */
Adrian Bunk08bc2db2006-04-28 10:59:12 -0400630static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode,
631 struct gfs2_dirent *dent,
632 const struct qstr *name,
633 struct buffer_head *bh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000634{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400635 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -0500636 struct gfs2_dirent *ndent;
637 unsigned offset = 0, totlen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000638
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500639 if (!gfs2_dirent_sentinel(dent))
Steven Whitehousec7526662006-03-20 12:30:04 -0500640 offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len));
641 totlen = be16_to_cpu(dent->de_rec_len);
642 BUG_ON(offset + name->len > totlen);
643 gfs2_trans_add_bh(ip->i_gl, bh, 1);
644 ndent = (struct gfs2_dirent *)((char *)dent + offset);
645 dent->de_rec_len = cpu_to_be16(offset);
646 gfs2_qstr2dirent(name, totlen - offset, ndent);
647 return ndent;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000648}
649
Steven Whitehousec7526662006-03-20 12:30:04 -0500650static struct gfs2_dirent *gfs2_dirent_alloc(struct inode *inode,
651 struct buffer_head *bh,
652 const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653{
654 struct gfs2_dirent *dent;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400655 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500656 gfs2_dirent_find_space, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500657 if (!dent || IS_ERR(dent))
658 return dent;
659 return gfs2_init_dirent(inode, dent, name, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000660}
661
Steven Whitehousecd915492006-09-04 12:49:07 -0400662static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000663 struct buffer_head **bhp)
664{
665 int error;
666
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400667 error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, bhp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400668 if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
669 /* printk(KERN_INFO "block num=%llu\n", leaf_no); */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000670 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400671 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000672
673 return error;
674}
675
676/**
677 * get_leaf_nr - Get a leaf number associated with the index
678 * @dip: The GFS2 inode
679 * @index:
680 * @leaf_out:
681 *
682 * Returns: 0 on success, error code otherwise
683 */
684
Steven Whitehousecd915492006-09-04 12:49:07 -0400685static int get_leaf_nr(struct gfs2_inode *dip, u32 index,
686 u64 *leaf_out)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000687{
Al Virob44b84d2006-10-14 10:46:30 -0400688 __be64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000689 int error;
690
Steven Whitehousee13940b2006-01-30 13:31:50 +0000691 error = gfs2_dir_read_data(dip, (char *)&leaf_no,
Al Virob44b84d2006-10-14 10:46:30 -0400692 index * sizeof(__be64),
693 sizeof(__be64), 0);
Steven Whitehousecd915492006-09-04 12:49:07 -0400694 if (error != sizeof(u64))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000695 return (error < 0) ? error : -EIO;
696
697 *leaf_out = be64_to_cpu(leaf_no);
698
699 return 0;
700}
701
Steven Whitehousecd915492006-09-04 12:49:07 -0400702static int get_first_leaf(struct gfs2_inode *dip, u32 index,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000703 struct buffer_head **bh_out)
704{
Steven Whitehousecd915492006-09-04 12:49:07 -0400705 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000706 int error;
707
708 error = get_leaf_nr(dip, index, &leaf_no);
709 if (!error)
710 error = get_leaf(dip, leaf_no, bh_out);
711
712 return error;
713}
714
Steven Whitehousec7526662006-03-20 12:30:04 -0500715static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
716 const struct qstr *name,
717 gfs2_dscan_t scan,
718 struct buffer_head **pbh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000719{
Steven Whitehousec7526662006-03-20 12:30:04 -0500720 struct buffer_head *bh;
721 struct gfs2_dirent *dent;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400722 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000723 int error;
724
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000725 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500726 struct gfs2_leaf *leaf;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000727 unsigned hsize = 1 << ip->i_depth;
Steven Whitehousec7526662006-03-20 12:30:04 -0500728 unsigned index;
729 u64 ln;
Steven Whitehousec9e98882008-11-04 09:47:33 +0000730 if (hsize * sizeof(u64) != ip->i_disksize) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500731 gfs2_consist_inode(ip);
732 return ERR_PTR(-EIO);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000733 }
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400734
Steven Whitehouse9a004502008-02-01 09:23:44 +0000735 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500736 error = get_first_leaf(ip, index, &bh);
737 if (error)
738 return ERR_PTR(error);
739 do {
740 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500741 scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500742 if (dent)
743 goto got_dent;
744 leaf = (struct gfs2_leaf *)bh->b_data;
745 ln = be64_to_cpu(leaf->lf_next);
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400746 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -0500747 if (!ln)
748 break;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400749
Steven Whitehousec7526662006-03-20 12:30:04 -0500750 error = get_leaf(ip, ln, &bh);
751 } while(!error);
752
753 return error ? ERR_PTR(error) : NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000754 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000755
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400756
Steven Whitehousec7526662006-03-20 12:30:04 -0500757 error = gfs2_meta_inode_buffer(ip, &bh);
758 if (error)
759 return ERR_PTR(error);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500760 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500761got_dent:
Steven Whitehousef4154ea2006-04-11 14:49:06 -0400762 if (unlikely(dent == NULL || IS_ERR(dent))) {
Steven Whitehouseed386502006-04-07 16:28:07 -0400763 brelse(bh);
764 bh = NULL;
765 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500766 *pbh = bh;
767 return dent;
768}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000769
Steven Whitehousec7526662006-03-20 12:30:04 -0500770static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth)
771{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400772 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000773 unsigned int n = 1;
Steven Whitehouse09010972009-05-20 10:48:47 +0100774 u64 bn;
775 int error;
776 struct buffer_head *bh;
Steven Whitehousec7526662006-03-20 12:30:04 -0500777 struct gfs2_leaf *leaf;
778 struct gfs2_dirent *dent;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500779 struct qstr name = { .name = "", .len = 0, .hash = 0 };
Steven Whitehouse09010972009-05-20 10:48:47 +0100780
781 error = gfs2_alloc_block(ip, &bn, &n);
782 if (error)
783 return NULL;
784 bh = gfs2_meta_new(ip->i_gl, bn);
Steven Whitehousec7526662006-03-20 12:30:04 -0500785 if (!bh)
786 return NULL;
Steven Whitehouse09010972009-05-20 10:48:47 +0100787
Steven Whitehouse5731be52008-02-01 13:16:55 +0000788 gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
Steven Whitehousec7526662006-03-20 12:30:04 -0500789 gfs2_trans_add_bh(ip->i_gl, bh, 1);
790 gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);
791 leaf = (struct gfs2_leaf *)bh->b_data;
792 leaf->lf_depth = cpu_to_be16(depth);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400793 leaf->lf_entries = 0;
Al Viroa2d7d022006-10-14 16:49:30 +0100794 leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -0400795 leaf->lf_next = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500796 memset(leaf->lf_reserved, 0, sizeof(leaf->lf_reserved));
797 dent = (struct gfs2_dirent *)(leaf+1);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500798 gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent);
Steven Whitehousec7526662006-03-20 12:30:04 -0500799 *pbh = bh;
800 return leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000801}
802
803/**
804 * dir_make_exhash - Convert a stuffed directory into an ExHash directory
805 * @dip: The GFS2 inode
806 *
807 * Returns: 0 on success, error code otherwise
808 */
809
Steven Whitehousec7526662006-03-20 12:30:04 -0500810static int dir_make_exhash(struct inode *inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000811{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400812 struct gfs2_inode *dip = GFS2_I(inode);
813 struct gfs2_sbd *sdp = GFS2_SB(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000814 struct gfs2_dirent *dent;
Steven Whitehousec7526662006-03-20 12:30:04 -0500815 struct qstr args;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000816 struct buffer_head *bh, *dibh;
817 struct gfs2_leaf *leaf;
818 int y;
Steven Whitehousecd915492006-09-04 12:49:07 -0400819 u32 x;
Al Virob44b84d2006-10-14 10:46:30 -0400820 __be64 *lp;
821 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000822 int error;
823
824 error = gfs2_meta_inode_buffer(dip, &dibh);
825 if (error)
826 return error;
827
David Teiglandb3b94fa2006-01-16 16:50:04 +0000828 /* Turn over a new leaf */
829
Steven Whitehousec7526662006-03-20 12:30:04 -0500830 leaf = new_leaf(inode, &bh, 0);
831 if (!leaf)
832 return -ENOSPC;
833 bn = bh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000834
Steven Whitehousead6203f2008-11-03 13:59:19 +0000835 gfs2_assert(sdp, dip->i_entries < (1 << 16));
836 leaf->lf_entries = cpu_to_be16(dip->i_entries);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000837
838 /* Copy dirents */
839
840 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh,
841 sizeof(struct gfs2_dinode));
842
843 /* Find last entry */
844
845 x = 0;
Steven Whitehousec7526662006-03-20 12:30:04 -0500846 args.len = bh->b_size - sizeof(struct gfs2_dinode) +
847 sizeof(struct gfs2_leaf);
848 args.name = bh->b_data;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400849 dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500850 gfs2_dirent_last, &args, NULL);
Steven Whitehousec7526662006-03-20 12:30:04 -0500851 if (!dent) {
852 brelse(bh);
853 brelse(dibh);
854 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000855 }
Steven Whitehousec7526662006-03-20 12:30:04 -0500856 if (IS_ERR(dent)) {
857 brelse(bh);
858 brelse(dibh);
859 return PTR_ERR(dent);
860 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000861
862 /* Adjust the last dirent's record length
863 (Remember that dent still points to the last entry.) */
864
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000865 dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) +
David Teiglandb3b94fa2006-01-16 16:50:04 +0000866 sizeof(struct gfs2_dinode) -
Steven Whitehouse4dd651a2006-02-14 15:56:44 +0000867 sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000868
869 brelse(bh);
870
871 /* We're done with the new leaf block, now setup the new
872 hash table. */
873
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000874 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000875 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
876
Al Virob44b84d2006-10-14 10:46:30 -0400877 lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000878
879 for (x = sdp->sd_hash_ptrs; x--; lp++)
880 *lp = cpu_to_be64(bn);
881
Steven Whitehousec9e98882008-11-04 09:47:33 +0000882 dip->i_disksize = sdp->sd_sb.sb_bsize / 2;
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000883 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000884 dip->i_diskflags |= GFS2_DIF_EXHASH;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000885
886 for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000887 dip->i_depth = y;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000888
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500889 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000890
891 brelse(dibh);
892
893 return 0;
894}
895
896/**
897 * dir_split_leaf - Split a leaf block into two
898 * @dip: The GFS2 inode
899 * @index:
900 * @leaf_no:
901 *
902 * Returns: 0 on success, error code on failure
903 */
904
Steven Whitehousec7526662006-03-20 12:30:04 -0500905static int dir_split_leaf(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000906{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400907 struct gfs2_inode *dip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000908 struct buffer_head *nbh, *obh, *dibh;
909 struct gfs2_leaf *nleaf, *oleaf;
Steven Whitehouse4da3c642006-07-11 13:19:13 -0400910 struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new;
Steven Whitehousecd915492006-09-04 12:49:07 -0400911 u32 start, len, half_len, divider;
Al Virob44b84d2006-10-14 10:46:30 -0400912 u64 bn, leaf_no;
913 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -0400914 u32 index;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000915 int x, moved = 0;
916 int error;
917
Steven Whitehouse9a004502008-02-01 09:23:44 +0000918 index = name->hash >> (32 - dip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -0500919 error = get_leaf_nr(dip, index, &leaf_no);
920 if (error)
921 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000922
923 /* Get the old leaf block */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000924 error = get_leaf(dip, leaf_no, &obh);
925 if (error)
Steven Whitehousee90deff2006-03-29 19:02:15 -0500926 return error;
927
928 oleaf = (struct gfs2_leaf *)obh->b_data;
Steven Whitehouse9a004502008-02-01 09:23:44 +0000929 if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) {
Steven Whitehousee90deff2006-03-29 19:02:15 -0500930 brelse(obh);
931 return 1; /* can't split */
932 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000933
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000934 gfs2_trans_add_bh(dip->i_gl, obh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000935
Steven Whitehousec7526662006-03-20 12:30:04 -0500936 nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1);
937 if (!nleaf) {
938 brelse(obh);
939 return -ENOSPC;
940 }
941 bn = nbh->b_blocknr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000942
Steven Whitehousec7526662006-03-20 12:30:04 -0500943 /* Compute the start and len of leaf pointers in the hash table. */
Steven Whitehouse9a004502008-02-01 09:23:44 +0000944 len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000945 half_len = len >> 1;
946 if (!half_len) {
Steven Whitehouse9a004502008-02-01 09:23:44 +0000947 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 +0000948 gfs2_consist_inode(dip);
949 error = -EIO;
950 goto fail_brelse;
951 }
952
953 start = (index & ~(len - 1));
954
955 /* Change the pointers.
956 Don't bother distinguishing stuffed from non-stuffed.
957 This code is complicated enough already. */
Al Virob44b84d2006-10-14 10:46:30 -0400958 lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959 /* Change the pointers */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000960 for (x = 0; x < half_len; x++)
961 lp[x] = cpu_to_be64(bn);
962
Steven Whitehousecd915492006-09-04 12:49:07 -0400963 error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64),
964 half_len * sizeof(u64));
965 if (error != half_len * sizeof(u64)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000966 if (error >= 0)
967 error = -EIO;
968 goto fail_lpfree;
969 }
970
971 kfree(lp);
972
973 /* Compute the divider */
Steven Whitehouse9a004502008-02-01 09:23:44 +0000974 divider = (start + half_len) << (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975
976 /* Copy the entries */
Steven Whitehouse15793432009-11-06 11:06:37 +0000977 dent = (struct gfs2_dirent *)(obh->b_data + sizeof(struct gfs2_leaf));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000978
979 do {
980 next = dent;
981 if (dirent_next(dip, obh, &next))
982 next = NULL;
983
Steven Whitehouse5e7d65c2006-11-17 12:27:44 -0500984 if (!gfs2_dirent_sentinel(dent) &&
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985 be32_to_cpu(dent->de_hash) < divider) {
Steven Whitehousec7526662006-03-20 12:30:04 -0500986 struct qstr str;
987 str.name = (char*)(dent+1);
988 str.len = be16_to_cpu(dent->de_name_len);
989 str.hash = be32_to_cpu(dent->de_hash);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500990 new = gfs2_dirent_alloc(inode, nbh, &str);
Steven Whitehousec7526662006-03-20 12:30:04 -0500991 if (IS_ERR(new)) {
992 error = PTR_ERR(new);
993 break;
994 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000995
996 new->de_inum = dent->de_inum; /* No endian worries */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000997 new->de_type = dent->de_type; /* No endian worries */
Marcin Slusarzbb16b342008-02-13 00:06:10 +0100998 be16_add_cpu(&nleaf->lf_entries, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000999
1000 dirent_del(dip, obh, prev, dent);
1001
1002 if (!oleaf->lf_entries)
1003 gfs2_consist_inode(dip);
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001004 be16_add_cpu(&oleaf->lf_entries, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001005
1006 if (!prev)
1007 prev = dent;
1008
1009 moved = 1;
Steven Whitehousec7526662006-03-20 12:30:04 -05001010 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001011 prev = dent;
Steven Whitehousec7526662006-03-20 12:30:04 -05001012 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001013 dent = next;
Steven Whitehousec7526662006-03-20 12:30:04 -05001014 } while (dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001015
Steven Whitehousec7526662006-03-20 12:30:04 -05001016 oleaf->lf_depth = nleaf->lf_depth;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001017
1018 error = gfs2_meta_inode_buffer(dip, &dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001019 if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) {
Steven Whitehouse382e6e22007-08-16 17:08:20 +01001020 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001021 gfs2_add_inode_blocks(&dip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001022 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001023 brelse(dibh);
1024 }
1025
1026 brelse(obh);
1027 brelse(nbh);
1028
1029 return error;
1030
Steven Whitehousee90deff2006-03-29 19:02:15 -05001031fail_lpfree:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001032 kfree(lp);
1033
Steven Whitehousee90deff2006-03-29 19:02:15 -05001034fail_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001035 brelse(obh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001036 brelse(nbh);
1037 return error;
1038}
1039
1040/**
1041 * dir_double_exhash - Double size of ExHash table
1042 * @dip: The GFS2 dinode
1043 *
1044 * Returns: 0 on success, error code on failure
1045 */
1046
1047static int dir_double_exhash(struct gfs2_inode *dip)
1048{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001049 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001050 struct buffer_head *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001051 u32 hsize;
1052 u64 *buf;
1053 u64 *from, *to;
1054 u64 block;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001055 int x;
1056 int error = 0;
1057
Steven Whitehouse9a004502008-02-01 09:23:44 +00001058 hsize = 1 << dip->i_depth;
Steven Whitehousec9e98882008-11-04 09:47:33 +00001059 if (hsize * sizeof(u64) != dip->i_disksize) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001060 gfs2_consist_inode(dip);
1061 return -EIO;
1062 }
1063
1064 /* Allocate both the "from" and "to" buffers in one big chunk */
1065
Josef Bacik16c5f062008-04-09 09:33:41 -04001066 buf = kcalloc(3, sdp->sd_hash_bsize, GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001067
Steven Whitehousec9e98882008-11-04 09:47:33 +00001068 for (block = dip->i_disksize >> sdp->sd_hash_bsize_shift; block--;) {
Steven Whitehousee13940b2006-01-30 13:31:50 +00001069 error = gfs2_dir_read_data(dip, (char *)buf,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001070 block * sdp->sd_hash_bsize,
Steven Whitehouse7276b3b2006-09-21 17:05:23 -04001071 sdp->sd_hash_bsize, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001072 if (error != sdp->sd_hash_bsize) {
1073 if (error >= 0)
1074 error = -EIO;
1075 goto fail;
1076 }
1077
1078 from = buf;
Steven Whitehousecd915492006-09-04 12:49:07 -04001079 to = (u64 *)((char *)buf + sdp->sd_hash_bsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001080
1081 for (x = sdp->sd_hash_ptrs; x--; from++) {
1082 *to++ = *from; /* No endianess worries */
1083 *to++ = *from;
1084 }
1085
Steven Whitehousee13940b2006-01-30 13:31:50 +00001086 error = gfs2_dir_write_data(dip,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001087 (char *)buf + sdp->sd_hash_bsize,
1088 block * sdp->sd_sb.sb_bsize,
1089 sdp->sd_sb.sb_bsize);
1090 if (error != sdp->sd_sb.sb_bsize) {
1091 if (error >= 0)
1092 error = -EIO;
1093 goto fail;
1094 }
1095 }
1096
1097 kfree(buf);
1098
1099 error = gfs2_meta_inode_buffer(dip, &dibh);
1100 if (!gfs2_assert_withdraw(sdp, !error)) {
Steven Whitehouse9a004502008-02-01 09:23:44 +00001101 dip->i_depth++;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001102 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001103 brelse(dibh);
1104 }
1105
1106 return error;
1107
Steven Whitehousea91ea692006-09-04 12:04:26 -04001108fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001109 kfree(buf);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001110 return error;
1111}
1112
1113/**
1114 * compare_dents - compare directory entries by hash value
1115 * @a: first dent
1116 * @b: second dent
1117 *
1118 * When comparing the hash entries of @a to @b:
1119 * gt: returns 1
1120 * lt: returns -1
1121 * eq: returns 0
1122 */
1123
1124static int compare_dents(const void *a, const void *b)
1125{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001126 const struct gfs2_dirent *dent_a, *dent_b;
Steven Whitehousecd915492006-09-04 12:49:07 -04001127 u32 hash_a, hash_b;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001128 int ret = 0;
1129
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001130 dent_a = *(const struct gfs2_dirent **)a;
Steven Whitehousec7526662006-03-20 12:30:04 -05001131 hash_a = be32_to_cpu(dent_a->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001132
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001133 dent_b = *(const struct gfs2_dirent **)b;
Steven Whitehousec7526662006-03-20 12:30:04 -05001134 hash_b = be32_to_cpu(dent_b->de_hash);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001135
1136 if (hash_a > hash_b)
1137 ret = 1;
1138 else if (hash_a < hash_b)
1139 ret = -1;
1140 else {
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001141 unsigned int len_a = be16_to_cpu(dent_a->de_name_len);
1142 unsigned int len_b = be16_to_cpu(dent_b->de_name_len);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001143
1144 if (len_a > len_b)
1145 ret = 1;
1146 else if (len_a < len_b)
1147 ret = -1;
1148 else
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001149 ret = memcmp(dent_a + 1, dent_b + 1, len_a);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001150 }
1151
1152 return ret;
1153}
1154
1155/**
1156 * do_filldir_main - read out directory entries
1157 * @dip: The GFS2 inode
1158 * @offset: The offset in the file to read from
1159 * @opaque: opaque data to pass to filldir
1160 * @filldir: The function to pass entries to
1161 * @darr: an array of struct gfs2_dirent pointers to read
1162 * @entries: the number of entries in darr
1163 * @copied: pointer to int that's non-zero if a entry has been copied out
1164 *
1165 * Jump through some hoops to make sure that if there are hash collsions,
1166 * they are read out at the beginning of a buffer. We want to minimize
1167 * the possibility that they will fall into different readdir buffers or
1168 * that someone will want to seek to that location.
1169 *
1170 * Returns: errno, >0 on exception from filldir
1171 */
1172
Steven Whitehousecd915492006-09-04 12:49:07 -04001173static int do_filldir_main(struct gfs2_inode *dip, u64 *offset,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001174 void *opaque, filldir_t filldir,
Steven Whitehousecd915492006-09-04 12:49:07 -04001175 const struct gfs2_dirent **darr, u32 entries,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001176 int *copied)
1177{
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001178 const struct gfs2_dirent *dent, *dent_next;
Steven Whitehousecd915492006-09-04 12:49:07 -04001179 u64 off, off_next;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001180 unsigned int x, y;
1181 int run = 0;
1182 int error = 0;
1183
1184 sort(darr, entries, sizeof(struct gfs2_dirent *), compare_dents, NULL);
1185
1186 dent_next = darr[0];
1187 off_next = be32_to_cpu(dent_next->de_hash);
1188 off_next = gfs2_disk_hash2offset(off_next);
1189
1190 for (x = 0, y = 1; x < entries; x++, y++) {
1191 dent = dent_next;
1192 off = off_next;
1193
1194 if (y < entries) {
1195 dent_next = darr[y];
1196 off_next = be32_to_cpu(dent_next->de_hash);
1197 off_next = gfs2_disk_hash2offset(off_next);
1198
1199 if (off < *offset)
1200 continue;
1201 *offset = off;
1202
1203 if (off_next == off) {
1204 if (*copied && !run)
1205 return 1;
1206 run = 1;
1207 } else
1208 run = 0;
1209 } else {
1210 if (off < *offset)
1211 continue;
1212 *offset = off;
1213 }
1214
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -04001215 error = filldir(opaque, (const char *)(dent + 1),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001216 be16_to_cpu(dent->de_name_len),
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001217 off, be64_to_cpu(dent->de_inum.no_addr),
Steven Whitehouse4dd651a2006-02-14 15:56:44 +00001218 be16_to_cpu(dent->de_type));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001219 if (error)
1220 return 1;
1221
1222 *copied = 1;
1223 }
1224
1225 /* Increment the *offset by one, so the next time we come into the
1226 do_filldir fxn, we get the next entry instead of the last one in the
1227 current leaf */
1228
1229 (*offset)++;
1230
1231 return 0;
1232}
1233
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001234static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001235 filldir_t filldir, int *copied, unsigned *depth,
1236 u64 leaf_no)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001237{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001238 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001239 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001240 struct buffer_head *bh;
1241 struct gfs2_leaf *lf;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001242 unsigned entries = 0, entries2 = 0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001243 unsigned leaves = 0;
1244 const struct gfs2_dirent **darr, *dent;
1245 struct dirent_gather g;
1246 struct buffer_head **larr;
1247 int leaf = 0;
1248 int error, i;
1249 u64 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001250
David Teiglandb3b94fa2006-01-16 16:50:04 +00001251 do {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001252 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001253 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001254 goto out;
1255 lf = (struct gfs2_leaf *)bh->b_data;
1256 if (leaves == 0)
1257 *depth = be16_to_cpu(lf->lf_depth);
1258 entries += be16_to_cpu(lf->lf_entries);
1259 leaves++;
1260 lfn = be64_to_cpu(lf->lf_next);
1261 brelse(bh);
1262 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001263
1264 if (!entries)
1265 return 0;
1266
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001267 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001268 /*
1269 * The extra 99 entries are not normally used, but are a buffer
1270 * zone in case the number of entries in the leaf is corrupt.
1271 * 99 is the maximum number of entries that can fit in a single
1272 * leaf block.
1273 */
1274 larr = vmalloc((leaves + entries + 99) * sizeof(void *));
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001275 if (!larr)
1276 goto out;
1277 darr = (const struct gfs2_dirent **)(larr + leaves);
1278 g.pdent = darr;
1279 g.offset = 0;
1280 lfn = leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001281
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001282 do {
1283 error = get_leaf(ip, lfn, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001284 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001285 goto out_kfree;
1286 lf = (struct gfs2_leaf *)bh->b_data;
1287 lfn = be64_to_cpu(lf->lf_next);
1288 if (lf->lf_entries) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001289 entries2 += be16_to_cpu(lf->lf_entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001290 dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size,
1291 gfs2_dirent_gather, NULL, &g);
1292 error = PTR_ERR(dent);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001293 if (IS_ERR(dent))
1294 goto out_kfree;
1295 if (entries2 != g.offset) {
akpm@linux-foundation.orgf391a4e2007-04-25 21:08:02 -07001296 fs_warn(sdp, "Number of entries corrupt in dir "
1297 "leaf %llu, entries2 (%u) != "
1298 "g.offset (%u)\n",
1299 (unsigned long long)bh->b_blocknr,
1300 entries2, g.offset);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001301
1302 error = -EIO;
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001303 goto out_kfree;
1304 }
1305 error = 0;
1306 larr[leaf++] = bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001307 } else {
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001308 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001309 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001310 } while(lfn);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001311
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001312 BUG_ON(entries2 != entries);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001313 error = do_filldir_main(ip, offset, opaque, filldir, darr,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001314 entries, copied);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001315out_kfree:
1316 for(i = 0; i < leaf; i++)
1317 brelse(larr[i]);
Steven Whitehousefe1bded2006-04-18 10:09:15 -04001318 vfree(larr);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001319out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001320 return error;
1321}
1322
1323/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001324 * dir_e_read - Reads the entries from a directory into a filldir buffer
1325 * @dip: dinode pointer
1326 * @offset: the hash of the last entry read shifted to the right once
1327 * @opaque: buffer for the filldir function to fill
1328 * @filldir: points to the filldir function to use
1329 *
1330 * Returns: errno
1331 */
1332
Steven Whitehousecd915492006-09-04 12:49:07 -04001333static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001334 filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001335{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001336 struct gfs2_inode *dip = GFS2_I(inode);
1337 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehousecd915492006-09-04 12:49:07 -04001338 u32 hsize, len = 0;
1339 u32 ht_offset, lp_offset, ht_offset_cur = -1;
1340 u32 hash, index;
Al Virob44b84d2006-10-14 10:46:30 -04001341 __be64 *lp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001342 int copied = 0;
1343 int error = 0;
Steven Whitehouse4da3c642006-07-11 13:19:13 -04001344 unsigned depth = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001345
Steven Whitehouse9a004502008-02-01 09:23:44 +00001346 hsize = 1 << dip->i_depth;
Steven Whitehousec9e98882008-11-04 09:47:33 +00001347 if (hsize * sizeof(u64) != dip->i_disksize) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001348 gfs2_consist_inode(dip);
1349 return -EIO;
1350 }
1351
1352 hash = gfs2_dir_offset2hash(*offset);
Steven Whitehouse9a004502008-02-01 09:23:44 +00001353 index = hash >> (32 - dip->i_depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001354
Josef Bacik16c5f062008-04-09 09:33:41 -04001355 lp = kmalloc(sdp->sd_hash_bsize, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001356 if (!lp)
1357 return -ENOMEM;
1358
1359 while (index < hsize) {
1360 lp_offset = index & (sdp->sd_hash_ptrs - 1);
1361 ht_offset = index - lp_offset;
1362
1363 if (ht_offset_cur != ht_offset) {
Steven Whitehousee13940b2006-01-30 13:31:50 +00001364 error = gfs2_dir_read_data(dip, (char *)lp,
Al Virob44b84d2006-10-14 10:46:30 -04001365 ht_offset * sizeof(__be64),
Steven Whitehouse7276b3b2006-09-21 17:05:23 -04001366 sdp->sd_hash_bsize, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001367 if (error != sdp->sd_hash_bsize) {
1368 if (error >= 0)
1369 error = -EIO;
1370 goto out;
1371 }
1372 ht_offset_cur = ht_offset;
1373 }
1374
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001375 error = gfs2_dir_read_leaf(inode, offset, opaque, filldir,
1376 &copied, &depth,
1377 be64_to_cpu(lp[lp_offset]));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001378 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001379 break;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001380
Steven Whitehouse9a004502008-02-01 09:23:44 +00001381 len = 1 << (dip->i_depth - depth);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001382 index = (index & ~(len - 1)) + len;
1383 }
1384
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001385out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001386 kfree(lp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001387 if (error > 0)
1388 error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001389 return error;
1390}
1391
Steven Whitehousecd915492006-09-04 12:49:07 -04001392int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
Steven Whitehouse3699e3a2007-01-17 15:09:20 +00001393 filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001394{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001395 struct gfs2_inode *dip = GFS2_I(inode);
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001396 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001397 struct dirent_gather g;
1398 const struct gfs2_dirent **darr, *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001399 struct buffer_head *dibh;
1400 int copied = 0;
1401 int error;
1402
Steven Whitehousead6203f2008-11-03 13:59:19 +00001403 if (!dip->i_entries)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001404 return 0;
1405
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001406 if (dip->i_diskflags & GFS2_DIF_EXHASH)
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001407 return dir_e_read(inode, offset, opaque, filldir);
1408
David Teiglandb3b94fa2006-01-16 16:50:04 +00001409 if (!gfs2_is_stuffed(dip)) {
1410 gfs2_consist_inode(dip);
1411 return -EIO;
1412 }
1413
David Teiglandb3b94fa2006-01-16 16:50:04 +00001414 error = gfs2_meta_inode_buffer(dip, &dibh);
1415 if (error)
1416 return error;
1417
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001418 error = -ENOMEM;
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001419 /* 96 is max number of dirents which can be stuffed into an inode */
Josef Bacik16c5f062008-04-09 09:33:41 -04001420 darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_NOFS);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001421 if (darr) {
1422 g.pdent = darr;
1423 g.offset = 0;
1424 dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size,
1425 gfs2_dirent_gather, NULL, &g);
1426 if (IS_ERR(dent)) {
1427 error = PTR_ERR(dent);
1428 goto out;
1429 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001430 if (dip->i_entries != g.offset) {
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001431 fs_warn(sdp, "Number of entries corrupt in dir %llu, "
Steven Whitehousead6203f2008-11-03 13:59:19 +00001432 "ip->i_entries (%u) != g.offset (%u)\n",
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001433 (unsigned long long)dip->i_no_addr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001434 dip->i_entries,
Steven Whitehousebdd19a22007-04-18 09:38:42 +01001435 g.offset);
1436 error = -EIO;
1437 goto out;
1438 }
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001439 error = do_filldir_main(dip, offset, opaque, filldir, darr,
Steven Whitehousead6203f2008-11-03 13:59:19 +00001440 dip->i_entries, &copied);
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001441out:
1442 kfree(darr);
1443 }
1444
David Teiglandb3b94fa2006-01-16 16:50:04 +00001445 if (error > 0)
1446 error = 0;
1447
1448 brelse(dibh);
1449
1450 return error;
1451}
1452
David Teiglandb3b94fa2006-01-16 16:50:04 +00001453/**
1454 * gfs2_dir_search - Search a directory
1455 * @dip: The GFS2 inode
1456 * @filename:
1457 * @inode:
1458 *
1459 * This routine searches a directory for a file or another directory.
1460 * Assumes a glock is held on dip.
1461 *
1462 * Returns: errno
1463 */
1464
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001465struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001466{
Steven Whitehousec7526662006-03-20 12:30:04 -05001467 struct buffer_head *bh;
1468 struct gfs2_dirent *dent;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001469 struct inode *inode;
1470
1471 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1472 if (dent) {
1473 if (IS_ERR(dent))
David Howellse231c2e2008-02-07 00:15:26 -08001474 return ERR_CAST(dent);
Wendy Chengbb9bcf02007-06-27 17:07:08 -04001475 inode = gfs2_inode_lookup(dir->i_sb,
1476 be16_to_cpu(dent->de_type),
1477 be64_to_cpu(dent->de_inum.no_addr),
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -05001478 be64_to_cpu(dent->de_inum.no_formal_ino), 0);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001479 brelse(bh);
1480 return inode;
1481 }
1482 return ERR_PTR(-ENOENT);
1483}
1484
1485int gfs2_dir_check(struct inode *dir, const struct qstr *name,
1486 const struct gfs2_inode *ip)
1487{
1488 struct buffer_head *bh;
1489 struct gfs2_dirent *dent;
1490 int ret = -ENOENT;
Steven Whitehousec7526662006-03-20 12:30:04 -05001491
1492 dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
1493 if (dent) {
1494 if (IS_ERR(dent))
1495 return PTR_ERR(dent);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001496 if (ip) {
1497 if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr)
1498 goto out;
1499 if (be64_to_cpu(dent->de_inum.no_formal_ino) !=
1500 ip->i_no_formal_ino)
1501 goto out;
1502 if (unlikely(IF2DT(ip->i_inode.i_mode) !=
1503 be16_to_cpu(dent->de_type))) {
1504 gfs2_consist_inode(GFS2_I(dir));
1505 ret = -EIO;
1506 goto out;
1507 }
1508 }
1509 ret = 0;
1510out:
Steven Whitehousec7526662006-03-20 12:30:04 -05001511 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001512 }
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001513 return ret;
Steven Whitehousec7526662006-03-20 12:30:04 -05001514}
1515
1516static int dir_new_leaf(struct inode *inode, const struct qstr *name)
1517{
1518 struct buffer_head *bh, *obh;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001519 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001520 struct gfs2_leaf *leaf, *oleaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001521 int error;
Steven Whitehousec7526662006-03-20 12:30:04 -05001522 u32 index;
1523 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001524
Steven Whitehouse9a004502008-02-01 09:23:44 +00001525 index = name->hash >> (32 - ip->i_depth);
Steven Whitehousec7526662006-03-20 12:30:04 -05001526 error = get_first_leaf(ip, index, &obh);
1527 if (error)
1528 return error;
1529 do {
1530 oleaf = (struct gfs2_leaf *)obh->b_data;
1531 bn = be64_to_cpu(oleaf->lf_next);
1532 if (!bn)
1533 break;
1534 brelse(obh);
1535 error = get_leaf(ip, bn, &obh);
1536 if (error)
1537 return error;
1538 } while(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001539
Steven Whitehousec7526662006-03-20 12:30:04 -05001540 gfs2_trans_add_bh(ip->i_gl, obh, 1);
1541
1542 leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth));
1543 if (!leaf) {
1544 brelse(obh);
1545 return -ENOSPC;
1546 }
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001547 oleaf->lf_next = cpu_to_be64(bh->b_blocknr);
Steven Whitehousec7526662006-03-20 12:30:04 -05001548 brelse(bh);
1549 brelse(obh);
1550
1551 error = gfs2_meta_inode_buffer(ip, &bh);
1552 if (error)
1553 return error;
1554 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001555 gfs2_add_inode_blocks(&ip->i_inode, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001556 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001557 brelse(bh);
1558 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001559}
1560
1561/**
1562 * gfs2_dir_add - Add new filename into directory
1563 * @dip: The GFS2 inode
1564 * @filename: The new name
1565 * @inode: The inode number of the entry
1566 * @type: The type of the entry
1567 *
1568 * Returns: 0 on success, error code on failure
1569 */
1570
Steven Whitehousec7526662006-03-20 12:30:04 -05001571int gfs2_dir_add(struct inode *inode, const struct qstr *name,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001572 const struct gfs2_inode *nip, unsigned type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001573{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001574 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001575 struct buffer_head *bh;
1576 struct gfs2_dirent *dent;
1577 struct gfs2_leaf *leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001578 int error;
1579
Steven Whitehousec7526662006-03-20 12:30:04 -05001580 while(1) {
1581 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space,
1582 &bh);
1583 if (dent) {
1584 if (IS_ERR(dent))
1585 return PTR_ERR(dent);
1586 dent = gfs2_init_dirent(inode, dent, name, bh);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001587 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001588 dent->de_type = cpu_to_be16(type);
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001589 if (ip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001590 leaf = (struct gfs2_leaf *)bh->b_data;
Marcin Slusarzbb16b342008-02-13 00:06:10 +01001591 be16_add_cpu(&leaf->lf_entries, 1);
Steven Whitehousec7526662006-03-20 12:30:04 -05001592 }
1593 brelse(bh);
1594 error = gfs2_meta_inode_buffer(ip, &bh);
1595 if (error)
1596 break;
1597 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001598 ip->i_entries++;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001599 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001600 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001601 brelse(bh);
1602 error = 0;
1603 break;
1604 }
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001605 if (!(ip->i_diskflags & GFS2_DIF_EXHASH)) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001606 error = dir_make_exhash(inode);
1607 if (error)
1608 break;
1609 continue;
1610 }
1611 error = dir_split_leaf(inode, name);
1612 if (error == 0)
1613 continue;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001614 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001615 break;
Steven Whitehouse9a004502008-02-01 09:23:44 +00001616 if (ip->i_depth < GFS2_DIR_MAX_DEPTH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001617 error = dir_double_exhash(ip);
1618 if (error)
1619 break;
1620 error = dir_split_leaf(inode, name);
Steven Whitehousee90deff2006-03-29 19:02:15 -05001621 if (error < 0)
Steven Whitehousec7526662006-03-20 12:30:04 -05001622 break;
Steven Whitehousee90deff2006-03-29 19:02:15 -05001623 if (error == 0)
1624 continue;
Steven Whitehousec7526662006-03-20 12:30:04 -05001625 }
1626 error = dir_new_leaf(inode, name);
1627 if (!error)
1628 continue;
1629 error = -ENOSPC;
1630 break;
1631 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001632 return error;
1633}
1634
Steven Whitehousec7526662006-03-20 12:30:04 -05001635
David Teiglandb3b94fa2006-01-16 16:50:04 +00001636/**
1637 * gfs2_dir_del - Delete a directory entry
1638 * @dip: The GFS2 inode
1639 * @filename: The filename
1640 *
1641 * Returns: 0 on success, error code on failure
1642 */
1643
Steven Whitehousec7526662006-03-20 12:30:04 -05001644int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001645{
Steven Whitehousec7526662006-03-20 12:30:04 -05001646 struct gfs2_dirent *dent, *prev = NULL;
1647 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001648 int error;
1649
Steven Whitehousec7526662006-03-20 12:30:04 -05001650 /* Returns _either_ the entry (if its first in block) or the
1651 previous entry otherwise */
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001652 dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001653 if (!dent) {
1654 gfs2_consist_inode(dip);
1655 return -EIO;
1656 }
1657 if (IS_ERR(dent)) {
1658 gfs2_consist_inode(dip);
1659 return PTR_ERR(dent);
1660 }
1661 /* If not first in block, adjust pointers accordingly */
Steven Whitehouse71b86f52006-03-28 14:14:04 -05001662 if (gfs2_dirent_find(dent, name, NULL) == 0) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001663 prev = dent;
1664 dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len));
1665 }
1666
1667 dirent_del(dip, bh, prev, dent);
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001668 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001669 struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data;
1670 u16 entries = be16_to_cpu(leaf->lf_entries);
1671 if (!entries)
1672 gfs2_consist_inode(dip);
1673 leaf->lf_entries = cpu_to_be16(--entries);
Steven Whitehousec7526662006-03-20 12:30:04 -05001674 }
Steven Whitehouseed386502006-04-07 16:28:07 -04001675 brelse(bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001676
1677 error = gfs2_meta_inode_buffer(dip, &bh);
1678 if (error)
1679 return error;
1680
Steven Whitehousead6203f2008-11-03 13:59:19 +00001681 if (!dip->i_entries)
Steven Whitehousec7526662006-03-20 12:30:04 -05001682 gfs2_consist_inode(dip);
1683 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehousead6203f2008-11-03 13:59:19 +00001684 dip->i_entries--;
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001685 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001686 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001687 brelse(bh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001688 mark_inode_dirty(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001689
1690 return error;
1691}
1692
David Teiglandb3b94fa2006-01-16 16:50:04 +00001693/**
1694 * gfs2_dir_mvino - Change inode number of directory entry
1695 * @dip: The GFS2 inode
1696 * @filename:
1697 * @new_inode:
1698 *
1699 * This routine changes the inode number of a directory entry. It's used
1700 * by rename to change ".." when a directory is moved.
1701 * Assumes a glock is held on dvp.
1702 *
1703 * Returns: errno
1704 */
1705
Steven Whitehousec7526662006-03-20 12:30:04 -05001706int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001707 const struct gfs2_inode *nip, unsigned int new_type)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001708{
Steven Whitehousec7526662006-03-20 12:30:04 -05001709 struct buffer_head *bh;
1710 struct gfs2_dirent *dent;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001711 int error;
1712
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001713 dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh);
Steven Whitehousec7526662006-03-20 12:30:04 -05001714 if (!dent) {
1715 gfs2_consist_inode(dip);
1716 return -EIO;
1717 }
1718 if (IS_ERR(dent))
1719 return PTR_ERR(dent);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001720
Steven Whitehousec7526662006-03-20 12:30:04 -05001721 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001722 gfs2_inum_out(nip, dent);
Steven Whitehousec7526662006-03-20 12:30:04 -05001723 dent->de_type = cpu_to_be16(new_type);
1724
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001725 if (dip->i_diskflags & GFS2_DIF_EXHASH) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001726 brelse(bh);
1727 error = gfs2_meta_inode_buffer(dip, &bh);
1728 if (error)
1729 return error;
1730 gfs2_trans_add_bh(dip->i_gl, bh, 1);
1731 }
1732
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001733 dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001734 gfs2_dinode_out(dip, bh->b_data);
Steven Whitehousec7526662006-03-20 12:30:04 -05001735 brelse(bh);
1736 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001737}
1738
1739/**
1740 * foreach_leaf - call a function for each leaf in a directory
1741 * @dip: the directory
1742 * @lc: the function to call for each each
1743 * @data: private data to pass to it
1744 *
1745 * Returns: errno
1746 */
1747
1748static int foreach_leaf(struct gfs2_inode *dip, leaf_call_t lc, void *data)
1749{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001750 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001751 struct buffer_head *bh;
Steven Whitehousec7526662006-03-20 12:30:04 -05001752 struct gfs2_leaf *leaf;
Steven Whitehousecd915492006-09-04 12:49:07 -04001753 u32 hsize, len;
1754 u32 ht_offset, lp_offset, ht_offset_cur = -1;
1755 u32 index = 0;
Al Virob44b84d2006-10-14 10:46:30 -04001756 __be64 *lp;
Steven Whitehousecd915492006-09-04 12:49:07 -04001757 u64 leaf_no;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001758 int error = 0;
1759
Steven Whitehouse9a004502008-02-01 09:23:44 +00001760 hsize = 1 << dip->i_depth;
Steven Whitehousec9e98882008-11-04 09:47:33 +00001761 if (hsize * sizeof(u64) != dip->i_disksize) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001762 gfs2_consist_inode(dip);
1763 return -EIO;
1764 }
1765
Josef Bacik16c5f062008-04-09 09:33:41 -04001766 lp = kmalloc(sdp->sd_hash_bsize, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001767 if (!lp)
1768 return -ENOMEM;
1769
1770 while (index < hsize) {
1771 lp_offset = index & (sdp->sd_hash_ptrs - 1);
1772 ht_offset = index - lp_offset;
1773
1774 if (ht_offset_cur != ht_offset) {
Steven Whitehousee13940b2006-01-30 13:31:50 +00001775 error = gfs2_dir_read_data(dip, (char *)lp,
Al Virob44b84d2006-10-14 10:46:30 -04001776 ht_offset * sizeof(__be64),
Steven Whitehouse7276b3b2006-09-21 17:05:23 -04001777 sdp->sd_hash_bsize, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001778 if (error != sdp->sd_hash_bsize) {
1779 if (error >= 0)
1780 error = -EIO;
1781 goto out;
1782 }
1783 ht_offset_cur = ht_offset;
1784 }
1785
1786 leaf_no = be64_to_cpu(lp[lp_offset]);
1787 if (leaf_no) {
1788 error = get_leaf(dip, leaf_no, &bh);
1789 if (error)
1790 goto out;
Steven Whitehousec7526662006-03-20 12:30:04 -05001791 leaf = (struct gfs2_leaf *)bh->b_data;
Steven Whitehouse9a004502008-02-01 09:23:44 +00001792 len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
Steven Whitehouse634ee0b2006-07-17 09:32:37 -04001793 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001794
1795 error = lc(dip, index, len, leaf_no, data);
1796 if (error)
1797 goto out;
1798
1799 index = (index & ~(len - 1)) + len;
1800 } else
1801 index++;
1802 }
1803
1804 if (index != hsize) {
1805 gfs2_consist_inode(dip);
1806 error = -EIO;
1807 }
1808
Steven Whitehouse634ee0b2006-07-17 09:32:37 -04001809out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001810 kfree(lp);
1811
1812 return error;
1813}
1814
1815/**
1816 * leaf_dealloc - Deallocate a directory leaf
1817 * @dip: the directory
1818 * @index: the hash table offset in the directory
1819 * @len: the number of pointers to this leaf
1820 * @leaf_no: the leaf number
1821 * @data: not used
1822 *
1823 * Returns: errno
1824 */
1825
Steven Whitehousecd915492006-09-04 12:49:07 -04001826static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
1827 u64 leaf_no, void *data)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001828{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001829 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -05001830 struct gfs2_leaf *tmp_leaf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001831 struct gfs2_rgrp_list rlist;
1832 struct buffer_head *bh, *dibh;
Steven Whitehousecd915492006-09-04 12:49:07 -04001833 u64 blk, nblk;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001834 unsigned int rg_blocks = 0, l_blocks = 0;
1835 char *ht;
Steven Whitehousecd915492006-09-04 12:49:07 -04001836 unsigned int x, size = len * sizeof(u64);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001837 int error;
1838
1839 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1840
Josef Bacik16c5f062008-04-09 09:33:41 -04001841 ht = kzalloc(size, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001842 if (!ht)
1843 return -ENOMEM;
1844
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001845 if (!gfs2_alloc_get(dip)) {
1846 error = -ENOMEM;
1847 goto out;
1848 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001849
1850 error = gfs2_quota_hold(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1851 if (error)
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001852 goto out_put;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001853
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001854 error = gfs2_rindex_hold(sdp, &dip->i_alloc->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001855 if (error)
1856 goto out_qs;
1857
1858 /* Count the number of leaves */
1859
Steven Whitehousec7526662006-03-20 12:30:04 -05001860 for (blk = leaf_no; blk; blk = nblk) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001861 error = get_leaf(dip, blk, &bh);
1862 if (error)
1863 goto out_rlist;
Steven Whitehousec7526662006-03-20 12:30:04 -05001864 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1865 nblk = be64_to_cpu(tmp_leaf->lf_next);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001866 brelse(bh);
1867
1868 gfs2_rlist_add(sdp, &rlist, blk);
1869 l_blocks++;
1870 }
1871
Bob Petersonfe6c9912008-01-28 11:13:02 -06001872 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001873
1874 for (x = 0; x < rlist.rl_rgrps; x++) {
1875 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001876 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +01001877 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001878 }
1879
1880 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1881 if (error)
1882 goto out_rlist;
1883
1884 error = gfs2_trans_begin(sdp,
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001885 rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) +
David Teiglandb3b94fa2006-01-16 16:50:04 +00001886 RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks);
1887 if (error)
1888 goto out_rg_gunlock;
1889
Steven Whitehousec7526662006-03-20 12:30:04 -05001890 for (blk = leaf_no; blk; blk = nblk) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001891 error = get_leaf(dip, blk, &bh);
1892 if (error)
1893 goto out_end_trans;
Steven Whitehousec7526662006-03-20 12:30:04 -05001894 tmp_leaf = (struct gfs2_leaf *)bh->b_data;
1895 nblk = be64_to_cpu(tmp_leaf->lf_next);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001896 brelse(bh);
1897
1898 gfs2_free_meta(dip, blk, 1);
Steven Whitehouse77658aa2008-02-12 14:17:27 +00001899 gfs2_add_inode_blocks(&dip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001900 }
1901
Steven Whitehousecd915492006-09-04 12:49:07 -04001902 error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001903 if (error != size) {
1904 if (error >= 0)
1905 error = -EIO;
1906 goto out_end_trans;
1907 }
1908
1909 error = gfs2_meta_inode_buffer(dip, &dibh);
1910 if (error)
1911 goto out_end_trans;
1912
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001913 gfs2_trans_add_bh(dip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001914 gfs2_dinode_out(dip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001915 brelse(dibh);
1916
Steven Whitehousea91ea692006-09-04 12:04:26 -04001917out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001918 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001919out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001920 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001921out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001922 gfs2_rlist_free(&rlist);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +00001923 gfs2_glock_dq_uninit(&dip->i_alloc->al_ri_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001924out_qs:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001925 gfs2_quota_unhold(dip);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001926out_put:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001927 gfs2_alloc_put(dip);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001928out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001929 kfree(ht);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001930 return error;
1931}
1932
1933/**
1934 * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory
1935 * @dip: the directory
1936 *
1937 * Dealloc all on-disk directory leaves to FREEMETA state
1938 * Change on-disk inode type to "regular file"
1939 *
1940 * Returns: errno
1941 */
1942
1943int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip)
1944{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001945 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001946 struct buffer_head *bh;
1947 int error;
1948
1949 /* Dealloc on-disk leaves to FREEMETA state */
1950 error = foreach_leaf(dip, leaf_dealloc, NULL);
1951 if (error)
1952 return error;
1953
1954 /* Make this a regular file in case we crash.
1955 (We don't want to free these blocks a second time.) */
1956
1957 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1958 if (error)
1959 return error;
1960
1961 error = gfs2_meta_inode_buffer(dip, &bh);
1962 if (!error) {
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001963 gfs2_trans_add_bh(dip->i_gl, bh, 1);
Steven Whitehouse568f4c92006-02-27 12:00:42 -05001964 ((struct gfs2_dinode *)bh->b_data)->di_mode =
1965 cpu_to_be32(S_IFREG);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001966 brelse(bh);
1967 }
1968
1969 gfs2_trans_end(sdp);
1970
1971 return error;
1972}
1973
1974/**
1975 * gfs2_diradd_alloc_required - find if adding entry will require an allocation
1976 * @ip: the file being written to
1977 * @filname: the filename that's going to be added
David Teiglandb3b94fa2006-01-16 16:50:04 +00001978 *
Steven Whitehousec7526662006-03-20 12:30:04 -05001979 * Returns: 1 if alloc required, 0 if not, -ve on error
David Teiglandb3b94fa2006-01-16 16:50:04 +00001980 */
1981
Steven Whitehouse4d8012b2006-04-12 17:39:45 -04001982int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001983{
Steven Whitehousec7526662006-03-20 12:30:04 -05001984 struct gfs2_dirent *dent;
1985 struct buffer_head *bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001986
Steven Whitehousec7526662006-03-20 12:30:04 -05001987 dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh);
Steven Whitehouseed386502006-04-07 16:28:07 -04001988 if (!dent) {
Steven Whitehousec7526662006-03-20 12:30:04 -05001989 return 1;
Steven Whitehouseed386502006-04-07 16:28:07 -04001990 }
Steven Whitehousec7526662006-03-20 12:30:04 -05001991 if (IS_ERR(dent))
1992 return PTR_ERR(dent);
1993 brelse(bh);
1994 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001995}
1996