blob: 996481eeb491363a75f804f807f8a7056f794e3d [file] [log] [blame]
Dave Chinner19de7352013-04-03 16:11:18 +11001/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * Copyright (c) 2012-2013 Red Hat, Inc.
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "xfs.h"
Dave Chinner239880e2013-10-23 10:50:10 +110020#include "xfs_shared.h"
Dave Chinner19de7352013-04-03 16:11:18 +110021#include "xfs_fs.h"
Dave Chinner6ca1c902013-08-12 20:49:26 +100022#include "xfs_format.h"
Dave Chinner239880e2013-10-23 10:50:10 +110023#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
Dave Chinner19de7352013-04-03 16:11:18 +110025#include "xfs_bit.h"
Dave Chinner19de7352013-04-03 16:11:18 +110026#include "xfs_mount.h"
Dave Chinner57062782013-10-15 09:17:51 +110027#include "xfs_da_format.h"
Dave Chinnerd6cf1302014-06-06 15:14:11 +100028#include "xfs_da_btree.h"
Dave Chinner2b9ab5a2013-08-12 20:49:37 +100029#include "xfs_dir2.h"
Dave Chinner19de7352013-04-03 16:11:18 +110030#include "xfs_inode.h"
Dave Chinner19de7352013-04-03 16:11:18 +110031#include "xfs_ialloc.h"
32#include "xfs_alloc.h"
33#include "xfs_bmap.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110034#include "xfs_bmap_btree.h"
Dave Chinner68988112013-08-12 20:49:42 +100035#include "xfs_bmap_util.h"
Dave Chinner19de7352013-04-03 16:11:18 +110036#include "xfs_error.h"
37#include "xfs_quota.h"
Dave Chinner19de7352013-04-03 16:11:18 +110038#include "xfs_trans_space.h"
Dave Chinner19de7352013-04-03 16:11:18 +110039#include "xfs_trace.h"
40#include "xfs_symlink.h"
Dave Chinner239880e2013-10-23 10:50:10 +110041#include "xfs_trans.h"
Dave Chinner239880e2013-10-23 10:50:10 +110042#include "xfs_log.h"
Dave Chinner19de7352013-04-03 16:11:18 +110043
44/* ----- Kernel only functions below ----- */
Dave Chinner19de7352013-04-03 16:11:18 +110045STATIC int
46xfs_readlink_bmap(
Dave Chinnerf948dd72013-04-03 16:11:19 +110047 struct xfs_inode *ip,
48 char *link)
Dave Chinner19de7352013-04-03 16:11:18 +110049{
Dave Chinnerf948dd72013-04-03 16:11:19 +110050 struct xfs_mount *mp = ip->i_mount;
51 struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
52 struct xfs_buf *bp;
53 xfs_daddr_t d;
54 char *cur_chunk;
55 int pathlen = ip->i_d.di_size;
56 int nmaps = XFS_SYMLINK_MAPS;
57 int byte_cnt;
58 int n;
59 int error = 0;
60 int fsblocks = 0;
61 int offset;
Dave Chinner19de7352013-04-03 16:11:18 +110062
Dave Chinnerf948dd72013-04-03 16:11:19 +110063 fsblocks = xfs_symlink_blocks(mp, pathlen);
64 error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
Dave Chinner19de7352013-04-03 16:11:18 +110065 if (error)
66 goto out;
67
Dave Chinnerf948dd72013-04-03 16:11:19 +110068 offset = 0;
Dave Chinner19de7352013-04-03 16:11:18 +110069 for (n = 0; n < nmaps; n++) {
70 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
71 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
72
Dave Chinnerf948dd72013-04-03 16:11:19 +110073 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
74 &xfs_symlink_buf_ops);
Dave Chinner19de7352013-04-03 16:11:18 +110075 if (!bp)
Dave Chinner24513372014-06-25 14:58:08 +100076 return -ENOMEM;
Dave Chinner19de7352013-04-03 16:11:18 +110077 error = bp->b_error;
78 if (error) {
79 xfs_buf_ioerror_alert(bp, __func__);
80 xfs_buf_relse(bp);
Dave Chinnerac75a1f2014-03-07 16:19:14 +110081
82 /* bad CRC means corrupted metadata */
Dave Chinner24513372014-06-25 14:58:08 +100083 if (error == -EFSBADCRC)
84 error = -EFSCORRUPTED;
Dave Chinner19de7352013-04-03 16:11:18 +110085 goto out;
86 }
Dave Chinnerf948dd72013-04-03 16:11:19 +110087 byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
Dave Chinner19de7352013-04-03 16:11:18 +110088 if (pathlen < byte_cnt)
89 byte_cnt = pathlen;
Dave Chinner19de7352013-04-03 16:11:18 +110090
Dave Chinnerf948dd72013-04-03 16:11:19 +110091 cur_chunk = bp->b_addr;
92 if (xfs_sb_version_hascrc(&mp->m_sb)) {
Eric Sandeenbda65ef2014-04-14 19:05:43 +100093 if (!xfs_symlink_hdr_ok(ip->i_ino, offset,
Dave Chinnerf948dd72013-04-03 16:11:19 +110094 byte_cnt, bp)) {
Dave Chinner24513372014-06-25 14:58:08 +100095 error = -EFSCORRUPTED;
Dave Chinnerf948dd72013-04-03 16:11:19 +110096 xfs_alert(mp,
97"symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)",
98 offset, byte_cnt, ip->i_ino);
99 xfs_buf_relse(bp);
100 goto out;
101
102 }
103
104 cur_chunk += sizeof(struct xfs_dsymlink_hdr);
105 }
106
Eric Sandeen2ac56d32015-06-22 09:42:48 +1000107 memcpy(link + offset, cur_chunk, byte_cnt);
Dave Chinnerf948dd72013-04-03 16:11:19 +1100108
109 pathlen -= byte_cnt;
110 offset += byte_cnt;
111
Dave Chinner19de7352013-04-03 16:11:18 +1100112 xfs_buf_relse(bp);
113 }
Dave Chinnerf948dd72013-04-03 16:11:19 +1100114 ASSERT(pathlen == 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100115
116 link[ip->i_d.di_size] = '\0';
117 error = 0;
118
119 out:
120 return error;
121}
122
123int
124xfs_readlink(
Dave Chinnerf948dd72013-04-03 16:11:19 +1100125 struct xfs_inode *ip,
Dave Chinner19de7352013-04-03 16:11:18 +1100126 char *link)
127{
Dave Chinnerf948dd72013-04-03 16:11:19 +1100128 struct xfs_mount *mp = ip->i_mount;
Dave Chinner19de7352013-04-03 16:11:18 +1100129 xfs_fsize_t pathlen;
130 int error = 0;
131
132 trace_xfs_readlink(ip);
133
134 if (XFS_FORCED_SHUTDOWN(mp))
Dave Chinner24513372014-06-25 14:58:08 +1000135 return -EIO;
Dave Chinner19de7352013-04-03 16:11:18 +1100136
137 xfs_ilock(ip, XFS_ILOCK_SHARED);
138
139 pathlen = ip->i_d.di_size;
140 if (!pathlen)
141 goto out;
142
143 if (pathlen < 0 || pathlen > MAXPATHLEN) {
144 xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
145 __func__, (unsigned long long) ip->i_ino,
146 (long long) pathlen);
147 ASSERT(0);
Dave Chinner24513372014-06-25 14:58:08 +1000148 error = -EFSCORRUPTED;
Dave Chinner19de7352013-04-03 16:11:18 +1100149 goto out;
150 }
151
152
153 if (ip->i_df.if_flags & XFS_IFINLINE) {
154 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
155 link[pathlen] = '\0';
156 } else {
157 error = xfs_readlink_bmap(ip, link);
158 }
159
160 out:
161 xfs_iunlock(ip, XFS_ILOCK_SHARED);
162 return error;
163}
164
165int
166xfs_symlink(
Dave Chinnerf948dd72013-04-03 16:11:19 +1100167 struct xfs_inode *dp,
Dave Chinner19de7352013-04-03 16:11:18 +1100168 struct xfs_name *link_name,
169 const char *target_path,
170 umode_t mode,
Dave Chinnerf948dd72013-04-03 16:11:19 +1100171 struct xfs_inode **ipp)
Dave Chinner19de7352013-04-03 16:11:18 +1100172{
Dave Chinnerf948dd72013-04-03 16:11:19 +1100173 struct xfs_mount *mp = dp->i_mount;
174 struct xfs_trans *tp = NULL;
175 struct xfs_inode *ip = NULL;
176 int error = 0;
Dave Chinner19de7352013-04-03 16:11:18 +1100177 int pathlen;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100178 struct xfs_bmap_free free_list;
Dave Chinner19de7352013-04-03 16:11:18 +1100179 xfs_fsblock_t first_block;
Dave Chinner58c90472015-02-23 22:38:08 +1100180 bool unlock_dp_on_error = false;
Dave Chinner19de7352013-04-03 16:11:18 +1100181 int committed;
182 xfs_fileoff_t first_fsb;
183 xfs_filblks_t fs_blocks;
184 int nmaps;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100185 struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
Dave Chinner19de7352013-04-03 16:11:18 +1100186 xfs_daddr_t d;
187 const char *cur_chunk;
188 int byte_cnt;
189 int n;
190 xfs_buf_t *bp;
191 prid_t prid;
Chandra Seetharaman113a5682013-06-27 17:25:07 -0500192 struct xfs_dquot *udqp = NULL;
193 struct xfs_dquot *gdqp = NULL;
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500194 struct xfs_dquot *pdqp = NULL;
Dave Chinner19de7352013-04-03 16:11:18 +1100195 uint resblks;
196
197 *ipp = NULL;
Dave Chinner19de7352013-04-03 16:11:18 +1100198
199 trace_xfs_symlink(dp, link_name);
200
201 if (XFS_FORCED_SHUTDOWN(mp))
Dave Chinner24513372014-06-25 14:58:08 +1000202 return -EIO;
Dave Chinner19de7352013-04-03 16:11:18 +1100203
204 /*
205 * Check component lengths of the target path name.
206 */
207 pathlen = strlen(target_path);
208 if (pathlen >= MAXPATHLEN) /* total string too long */
Dave Chinner24513372014-06-25 14:58:08 +1000209 return -ENAMETOOLONG;
Dave Chinner19de7352013-04-03 16:11:18 +1100210
211 udqp = gdqp = NULL;
Zhi Yong Wu163467d2013-12-18 08:22:39 +0800212 prid = xfs_get_initial_prid(dp);
Dave Chinner19de7352013-04-03 16:11:18 +1100213
214 /*
215 * Make sure that we have allocated dquot(s) on disk.
216 */
Dwight Engen7aab1b22013-08-15 14:08:01 -0400217 error = xfs_qm_vop_dqalloc(dp,
218 xfs_kuid_to_uid(current_fsuid()),
219 xfs_kgid_to_gid(current_fsgid()), prid,
220 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
221 &udqp, &gdqp, &pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100222 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100223 return error;
Dave Chinner19de7352013-04-03 16:11:18 +1100224
225 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
Dave Chinner19de7352013-04-03 16:11:18 +1100226 /*
227 * The symlink will fit into the inode data fork?
228 * There can't be any attributes so we get the whole variable part.
229 */
230 if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version))
231 fs_blocks = 0;
232 else
Dave Chinner321a9582013-05-27 16:38:20 +1000233 fs_blocks = xfs_symlink_blocks(mp, pathlen);
Dave Chinner19de7352013-04-03 16:11:18 +1100234 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
Jie Liu3d3c8b52013-08-12 20:49:59 +1000235 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_symlink, resblks, 0);
Dave Chinner24513372014-06-25 14:58:08 +1000236 if (error == -ENOSPC && fs_blocks == 0) {
Dave Chinner19de7352013-04-03 16:11:18 +1100237 resblks = 0;
Jie Liu3d3c8b52013-08-12 20:49:59 +1000238 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_symlink, 0, 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100239 }
Christoph Hellwig4906e212015-06-04 13:47:56 +1000240 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100241 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100242
Dave Chinnerdbad7c92015-08-19 10:33:00 +1000243 xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
244 XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT);
Dave Chinner19de7352013-04-03 16:11:18 +1100245 unlock_dp_on_error = true;
246
247 /*
248 * Check whether the directory allows new symlinks or not.
249 */
250 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
Dave Chinner24513372014-06-25 14:58:08 +1000251 error = -EPERM;
Dave Chinner58c90472015-02-23 22:38:08 +1100252 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100253 }
254
255 /*
256 * Reserve disk quota : blocks and inode.
257 */
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500258 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
259 pdqp, resblks, 1, 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100260 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100261 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100262
263 /*
264 * Check for ability to enter directory entry, if no space reserved.
265 */
Eric Sandeen94f3cad2014-09-09 11:57:52 +1000266 if (!resblks) {
267 error = xfs_dir_canenter(tp, dp, link_name);
268 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100269 goto out_trans_cancel;
Eric Sandeen94f3cad2014-09-09 11:57:52 +1000270 }
Dave Chinner19de7352013-04-03 16:11:18 +1100271 /*
272 * Initialize the bmap freelist prior to calling either
273 * bmapi or the directory create code.
274 */
275 xfs_bmap_init(&free_list, &first_block);
276
277 /*
278 * Allocate an inode for the symlink.
279 */
280 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
281 prid, resblks > 0, &ip, NULL);
Dave Chinner58c90472015-02-23 22:38:08 +1100282 if (error)
283 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100284
285 /*
Dave Chinner58c90472015-02-23 22:38:08 +1100286 * Now we join the directory inode to the transaction. We do not do it
287 * earlier because xfs_dir_ialloc might commit the previous transaction
288 * (and release all the locks). An error from here on will result in
289 * the transaction cancel unlocking dp so don't do it explicitly in the
Dave Chinner19de7352013-04-03 16:11:18 +1100290 * error path.
291 */
Dave Chinnerdbad7c92015-08-19 10:33:00 +1000292 xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100293 unlock_dp_on_error = false;
294
295 /*
296 * Also attach the dquot(s) to it, if applicable.
297 */
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500298 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100299
300 if (resblks)
301 resblks -= XFS_IALLOC_SPACE_RES(mp);
302 /*
303 * If the symlink will fit into the inode, write it inline.
304 */
305 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
306 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
307 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
308 ip->i_d.di_size = pathlen;
309
310 /*
311 * The inode was initially created in extent format.
312 */
313 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
314 ip->i_df.if_flags |= XFS_IFINLINE;
315
316 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
317 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
318
319 } else {
Dave Chinnerf948dd72013-04-03 16:11:19 +1100320 int offset;
321
Dave Chinner19de7352013-04-03 16:11:18 +1100322 first_fsb = 0;
323 nmaps = XFS_SYMLINK_MAPS;
324
325 error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
326 XFS_BMAPI_METADATA, &first_block, resblks,
327 mval, &nmaps, &free_list);
328 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100329 goto out_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100330
331 if (resblks)
332 resblks -= fs_blocks;
333 ip->i_d.di_size = pathlen;
334 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
335
336 cur_chunk = target_path;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100337 offset = 0;
Dave Chinner19de7352013-04-03 16:11:18 +1100338 for (n = 0; n < nmaps; n++) {
Dave Chinner321a9582013-05-27 16:38:20 +1000339 char *buf;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100340
Dave Chinner19de7352013-04-03 16:11:18 +1100341 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
342 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
343 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
344 BTOBB(byte_cnt), 0);
345 if (!bp) {
Dave Chinner24513372014-06-25 14:58:08 +1000346 error = -ENOMEM;
Dave Chinner58c90472015-02-23 22:38:08 +1100347 goto out_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100348 }
Dave Chinnerf948dd72013-04-03 16:11:19 +1100349 bp->b_ops = &xfs_symlink_buf_ops;
350
351 byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
Dave Chinner321a9582013-05-27 16:38:20 +1000352 byte_cnt = min(byte_cnt, pathlen);
Dave Chinner19de7352013-04-03 16:11:18 +1100353
Dave Chinnerf948dd72013-04-03 16:11:19 +1100354 buf = bp->b_addr;
355 buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
356 byte_cnt, bp);
357
358 memcpy(buf, cur_chunk, byte_cnt);
359
Dave Chinner19de7352013-04-03 16:11:18 +1100360 cur_chunk += byte_cnt;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100361 pathlen -= byte_cnt;
362 offset += byte_cnt;
Dave Chinner19de7352013-04-03 16:11:18 +1100363
Dave Chinnerdaf7b792013-09-02 10:32:00 +1000364 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
Dave Chinnerf948dd72013-04-03 16:11:19 +1100365 xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
366 (char *)bp->b_addr);
Dave Chinner19de7352013-04-03 16:11:18 +1100367 }
Dave Chinner321a9582013-05-27 16:38:20 +1000368 ASSERT(pathlen == 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100369 }
370
371 /*
372 * Create the directory entry for the symlink.
373 */
374 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
375 &first_block, &free_list, resblks);
376 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100377 goto out_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100378 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
379 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
380
381 /*
382 * If this is a synchronous mount, make sure that the
383 * symlink transaction goes to disk before returning to
384 * the user.
385 */
386 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
387 xfs_trans_set_sync(tp);
388 }
389
390 error = xfs_bmap_finish(&tp, &free_list, &committed);
Dave Chinner58c90472015-02-23 22:38:08 +1100391 if (error)
392 goto out_bmap_cancel;
393
Christoph Hellwig70393312015-06-04 13:48:08 +1000394 error = xfs_trans_commit(tp);
Dave Chinner58c90472015-02-23 22:38:08 +1100395 if (error)
396 goto out_release_inode;
397
Dave Chinner19de7352013-04-03 16:11:18 +1100398 xfs_qm_dqrele(udqp);
399 xfs_qm_dqrele(gdqp);
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500400 xfs_qm_dqrele(pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100401
402 *ipp = ip;
403 return 0;
404
Dave Chinner58c90472015-02-23 22:38:08 +1100405out_bmap_cancel:
Dave Chinner19de7352013-04-03 16:11:18 +1100406 xfs_bmap_cancel(&free_list);
Dave Chinner58c90472015-02-23 22:38:08 +1100407out_trans_cancel:
Christoph Hellwig4906e212015-06-04 13:47:56 +1000408 xfs_trans_cancel(tp);
Dave Chinner58c90472015-02-23 22:38:08 +1100409out_release_inode:
410 /*
411 * Wait until after the current transaction is aborted to finish the
412 * setup of the inode and release the inode. This prevents recursive
413 * transactions and deadlocks from xfs_inactive.
414 */
415 if (ip) {
416 xfs_finish_inode_setup(ip);
417 IRELE(ip);
418 }
419
Dave Chinner19de7352013-04-03 16:11:18 +1100420 xfs_qm_dqrele(udqp);
421 xfs_qm_dqrele(gdqp);
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500422 xfs_qm_dqrele(pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100423
424 if (unlock_dp_on_error)
Dave Chinnerdbad7c92015-08-19 10:33:00 +1000425 xfs_iunlock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100426 return error;
427}
428
429/*
430 * Free a symlink that has blocks associated with it.
431 */
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500432STATIC int
Dave Chinner19de7352013-04-03 16:11:18 +1100433xfs_inactive_symlink_rmt(
Brian Foster36b21dd2013-09-20 11:06:09 -0400434 struct xfs_inode *ip)
Dave Chinner19de7352013-04-03 16:11:18 +1100435{
436 xfs_buf_t *bp;
437 int committed;
438 int done;
439 int error;
440 xfs_fsblock_t first_block;
441 xfs_bmap_free_t free_list;
442 int i;
443 xfs_mount_t *mp;
444 xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
445 int nmaps;
Dave Chinner19de7352013-04-03 16:11:18 +1100446 int size;
447 xfs_trans_t *tp;
448
Dave Chinner19de7352013-04-03 16:11:18 +1100449 mp = ip->i_mount;
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500450 ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
Dave Chinner19de7352013-04-03 16:11:18 +1100451 /*
452 * We're freeing a symlink that has some
453 * blocks allocated to it. Free the
454 * blocks here. We know that we've got
455 * either 1 or 2 extents and that we can
456 * free them all in one bunmapi call.
457 */
458 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
459
Brian Foster36b21dd2013-09-20 11:06:09 -0400460 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
461 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
462 if (error) {
Christoph Hellwig4906e212015-06-04 13:47:56 +1000463 xfs_trans_cancel(tp);
Brian Foster36b21dd2013-09-20 11:06:09 -0400464 return error;
465 }
466
467 xfs_ilock(ip, XFS_ILOCK_EXCL);
468 xfs_trans_ijoin(tp, ip, 0);
469
Dave Chinner19de7352013-04-03 16:11:18 +1100470 /*
471 * Lock the inode, fix the size, and join it to the transaction.
472 * Hold it so in the normal path, we still have it locked for
473 * the second transaction. In the error paths we need it
474 * held so the cancel won't rele it, see below.
475 */
476 size = (int)ip->i_d.di_size;
477 ip->i_d.di_size = 0;
478 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
479 /*
480 * Find the block(s) so we can inval and unmap them.
481 */
482 done = 0;
483 xfs_bmap_init(&free_list, &first_block);
484 nmaps = ARRAY_SIZE(mval);
Dave Chinnerf948dd72013-04-03 16:11:19 +1100485 error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
Dave Chinner19de7352013-04-03 16:11:18 +1100486 mval, &nmaps, 0);
487 if (error)
Brian Foster36b21dd2013-09-20 11:06:09 -0400488 goto error_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100489 /*
Dave Chinnerf948dd72013-04-03 16:11:19 +1100490 * Invalidate the block(s). No validation is done.
Dave Chinner19de7352013-04-03 16:11:18 +1100491 */
492 for (i = 0; i < nmaps; i++) {
493 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
494 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
495 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
496 if (!bp) {
Dave Chinner24513372014-06-25 14:58:08 +1000497 error = -ENOMEM;
Brian Foster36b21dd2013-09-20 11:06:09 -0400498 goto error_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100499 }
500 xfs_trans_binval(tp, bp);
501 }
502 /*
503 * Unmap the dead block(s) to the free_list.
504 */
Dave Chinnerab7bb612015-07-29 11:51:01 +1000505 error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps,
Brian Foster36b21dd2013-09-20 11:06:09 -0400506 &first_block, &free_list, &done);
507 if (error)
508 goto error_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100509 ASSERT(done);
510 /*
511 * Commit the first transaction. This logs the EFI and the inode.
512 */
Brian Foster36b21dd2013-09-20 11:06:09 -0400513 error = xfs_bmap_finish(&tp, &free_list, &committed);
514 if (error)
515 goto error_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100516 /*
517 * The transaction must have been committed, since there were
518 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
519 * The new tp has the extent freeing and EFDs.
520 */
521 ASSERT(committed);
522 /*
523 * The first xact was committed, so add the inode to the new one.
524 * Mark it dirty so it will be logged and moved forward in the log as
525 * part of every commit.
526 */
527 xfs_trans_ijoin(tp, ip, 0);
528 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
529 /*
Dave Chinner19de7352013-04-03 16:11:18 +1100530 * Commit the transaction containing extent freeing and EFDs.
Dave Chinner19de7352013-04-03 16:11:18 +1100531 */
Christoph Hellwig70393312015-06-04 13:48:08 +1000532 error = xfs_trans_commit(tp);
Dave Chinner19de7352013-04-03 16:11:18 +1100533 if (error) {
534 ASSERT(XFS_FORCED_SHUTDOWN(mp));
Brian Foster36b21dd2013-09-20 11:06:09 -0400535 goto error_unlock;
Dave Chinner19de7352013-04-03 16:11:18 +1100536 }
Dave Chinner19de7352013-04-03 16:11:18 +1100537
538 /*
539 * Remove the memory for extent descriptions (just bookkeeping).
540 */
541 if (ip->i_df.if_bytes)
542 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
543 ASSERT(ip->i_df.if_bytes == 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100544
Brian Foster36b21dd2013-09-20 11:06:09 -0400545 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100546 return 0;
547
Brian Foster36b21dd2013-09-20 11:06:09 -0400548error_bmap_cancel:
Dave Chinner19de7352013-04-03 16:11:18 +1100549 xfs_bmap_cancel(&free_list);
Brian Foster36b21dd2013-09-20 11:06:09 -0400550error_trans_cancel:
Christoph Hellwig4906e212015-06-04 13:47:56 +1000551 xfs_trans_cancel(tp);
Brian Foster36b21dd2013-09-20 11:06:09 -0400552error_unlock:
553 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100554 return error;
555}
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500556
557/*
558 * xfs_inactive_symlink - free a symlink
559 */
560int
561xfs_inactive_symlink(
Brian Foster36b21dd2013-09-20 11:06:09 -0400562 struct xfs_inode *ip)
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500563{
564 struct xfs_mount *mp = ip->i_mount;
565 int pathlen;
566
567 trace_xfs_inactive_symlink(ip);
568
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500569 if (XFS_FORCED_SHUTDOWN(mp))
Dave Chinner24513372014-06-25 14:58:08 +1000570 return -EIO;
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500571
Brian Foster36b21dd2013-09-20 11:06:09 -0400572 xfs_ilock(ip, XFS_ILOCK_EXCL);
573
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500574 /*
575 * Zero length symlinks _can_ exist.
576 */
577 pathlen = (int)ip->i_d.di_size;
Brian Foster36b21dd2013-09-20 11:06:09 -0400578 if (!pathlen) {
579 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500580 return 0;
Brian Foster36b21dd2013-09-20 11:06:09 -0400581 }
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500582
583 if (pathlen < 0 || pathlen > MAXPATHLEN) {
584 xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
585 __func__, (unsigned long long)ip->i_ino, pathlen);
Brian Foster36b21dd2013-09-20 11:06:09 -0400586 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500587 ASSERT(0);
Dave Chinner24513372014-06-25 14:58:08 +1000588 return -EFSCORRUPTED;
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500589 }
590
591 if (ip->i_df.if_flags & XFS_IFINLINE) {
Brian Foster36b21dd2013-09-20 11:06:09 -0400592 if (ip->i_df.if_bytes > 0)
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500593 xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
594 XFS_DATA_FORK);
Brian Foster36b21dd2013-09-20 11:06:09 -0400595 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500596 ASSERT(ip->i_df.if_bytes == 0);
597 return 0;
598 }
599
Brian Foster36b21dd2013-09-20 11:06:09 -0400600 xfs_iunlock(ip, XFS_ILOCK_EXCL);
601
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500602 /* remove the remote symlink */
Brian Foster36b21dd2013-09-20 11:06:09 -0400603 return xfs_inactive_symlink_rmt(ip);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500604}