blob: 08a46c6181fdb698bf6b6deed28e21fa6c01ce7d [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
Christoph Hellwig30ee0522016-04-06 07:53:29 +1000134 ASSERT(!(ip->i_df.if_flags & XFS_IFINLINE));
135
Dave Chinner19de7352013-04-03 16:11:18 +1100136 if (XFS_FORCED_SHUTDOWN(mp))
Dave Chinner24513372014-06-25 14:58:08 +1000137 return -EIO;
Dave Chinner19de7352013-04-03 16:11:18 +1100138
139 xfs_ilock(ip, XFS_ILOCK_SHARED);
140
141 pathlen = ip->i_d.di_size;
142 if (!pathlen)
143 goto out;
144
145 if (pathlen < 0 || pathlen > MAXPATHLEN) {
146 xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
147 __func__, (unsigned long long) ip->i_ino,
148 (long long) pathlen);
149 ASSERT(0);
Dave Chinner24513372014-06-25 14:58:08 +1000150 error = -EFSCORRUPTED;
Dave Chinner19de7352013-04-03 16:11:18 +1100151 goto out;
152 }
153
154
Christoph Hellwig30ee0522016-04-06 07:53:29 +1000155 error = xfs_readlink_bmap(ip, link);
Dave Chinner19de7352013-04-03 16:11:18 +1100156
157 out:
158 xfs_iunlock(ip, XFS_ILOCK_SHARED);
159 return error;
160}
161
162int
163xfs_symlink(
Dave Chinnerf948dd72013-04-03 16:11:19 +1100164 struct xfs_inode *dp,
Dave Chinner19de7352013-04-03 16:11:18 +1100165 struct xfs_name *link_name,
166 const char *target_path,
167 umode_t mode,
Dave Chinnerf948dd72013-04-03 16:11:19 +1100168 struct xfs_inode **ipp)
Dave Chinner19de7352013-04-03 16:11:18 +1100169{
Dave Chinnerf948dd72013-04-03 16:11:19 +1100170 struct xfs_mount *mp = dp->i_mount;
171 struct xfs_trans *tp = NULL;
172 struct xfs_inode *ip = NULL;
173 int error = 0;
Dave Chinner19de7352013-04-03 16:11:18 +1100174 int pathlen;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100175 struct xfs_bmap_free free_list;
Dave Chinner19de7352013-04-03 16:11:18 +1100176 xfs_fsblock_t first_block;
Dave Chinner58c90472015-02-23 22:38:08 +1100177 bool unlock_dp_on_error = false;
Dave Chinner19de7352013-04-03 16:11:18 +1100178 xfs_fileoff_t first_fsb;
179 xfs_filblks_t fs_blocks;
180 int nmaps;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100181 struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
Dave Chinner19de7352013-04-03 16:11:18 +1100182 xfs_daddr_t d;
183 const char *cur_chunk;
184 int byte_cnt;
185 int n;
186 xfs_buf_t *bp;
187 prid_t prid;
Chandra Seetharaman113a5682013-06-27 17:25:07 -0500188 struct xfs_dquot *udqp = NULL;
189 struct xfs_dquot *gdqp = NULL;
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500190 struct xfs_dquot *pdqp = NULL;
Dave Chinner19de7352013-04-03 16:11:18 +1100191 uint resblks;
192
193 *ipp = NULL;
Dave Chinner19de7352013-04-03 16:11:18 +1100194
195 trace_xfs_symlink(dp, link_name);
196
197 if (XFS_FORCED_SHUTDOWN(mp))
Dave Chinner24513372014-06-25 14:58:08 +1000198 return -EIO;
Dave Chinner19de7352013-04-03 16:11:18 +1100199
200 /*
201 * Check component lengths of the target path name.
202 */
203 pathlen = strlen(target_path);
204 if (pathlen >= MAXPATHLEN) /* total string too long */
Dave Chinner24513372014-06-25 14:58:08 +1000205 return -ENAMETOOLONG;
Dave Chinner19de7352013-04-03 16:11:18 +1100206
207 udqp = gdqp = NULL;
Zhi Yong Wu163467d2013-12-18 08:22:39 +0800208 prid = xfs_get_initial_prid(dp);
Dave Chinner19de7352013-04-03 16:11:18 +1100209
210 /*
211 * Make sure that we have allocated dquot(s) on disk.
212 */
Dwight Engen7aab1b22013-08-15 14:08:01 -0400213 error = xfs_qm_vop_dqalloc(dp,
214 xfs_kuid_to_uid(current_fsuid()),
215 xfs_kgid_to_gid(current_fsgid()), prid,
216 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
217 &udqp, &gdqp, &pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100218 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100219 return error;
Dave Chinner19de7352013-04-03 16:11:18 +1100220
Dave Chinner19de7352013-04-03 16:11:18 +1100221 /*
222 * The symlink will fit into the inode data fork?
223 * There can't be any attributes so we get the whole variable part.
224 */
225 if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version))
226 fs_blocks = 0;
227 else
Dave Chinner321a9582013-05-27 16:38:20 +1000228 fs_blocks = xfs_symlink_blocks(mp, pathlen);
Dave Chinner19de7352013-04-03 16:11:18 +1100229 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
Christoph Hellwig253f4912016-04-06 09:19:55 +1000230
231 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_symlink, resblks, 0, 0, &tp);
Dave Chinner24513372014-06-25 14:58:08 +1000232 if (error == -ENOSPC && fs_blocks == 0) {
Dave Chinner19de7352013-04-03 16:11:18 +1100233 resblks = 0;
Christoph Hellwig253f4912016-04-06 09:19:55 +1000234 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_symlink, 0, 0, 0,
235 &tp);
Dave Chinner19de7352013-04-03 16:11:18 +1100236 }
Christoph Hellwig4906e212015-06-04 13:47:56 +1000237 if (error)
Christoph Hellwig253f4912016-04-06 09:19:55 +1000238 goto out_release_inode;
Dave Chinner19de7352013-04-03 16:11:18 +1100239
Dave Chinnerdbad7c92015-08-19 10:33:00 +1000240 xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
241 XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT);
Dave Chinner19de7352013-04-03 16:11:18 +1100242 unlock_dp_on_error = true;
243
244 /*
245 * Check whether the directory allows new symlinks or not.
246 */
247 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
Dave Chinner24513372014-06-25 14:58:08 +1000248 error = -EPERM;
Dave Chinner58c90472015-02-23 22:38:08 +1100249 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100250 }
251
252 /*
253 * Reserve disk quota : blocks and inode.
254 */
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500255 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
256 pdqp, resblks, 1, 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100257 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100258 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100259
260 /*
261 * Check for ability to enter directory entry, if no space reserved.
262 */
Eric Sandeen94f3cad2014-09-09 11:57:52 +1000263 if (!resblks) {
264 error = xfs_dir_canenter(tp, dp, link_name);
265 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100266 goto out_trans_cancel;
Eric Sandeen94f3cad2014-09-09 11:57:52 +1000267 }
Dave Chinner19de7352013-04-03 16:11:18 +1100268 /*
269 * Initialize the bmap freelist prior to calling either
270 * bmapi or the directory create code.
271 */
272 xfs_bmap_init(&free_list, &first_block);
273
274 /*
275 * Allocate an inode for the symlink.
276 */
277 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
278 prid, resblks > 0, &ip, NULL);
Dave Chinner58c90472015-02-23 22:38:08 +1100279 if (error)
280 goto out_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100281
282 /*
Dave Chinner58c90472015-02-23 22:38:08 +1100283 * Now we join the directory inode to the transaction. We do not do it
284 * earlier because xfs_dir_ialloc might commit the previous transaction
285 * (and release all the locks). An error from here on will result in
286 * the transaction cancel unlocking dp so don't do it explicitly in the
Dave Chinner19de7352013-04-03 16:11:18 +1100287 * error path.
288 */
Dave Chinnerdbad7c92015-08-19 10:33:00 +1000289 xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100290 unlock_dp_on_error = false;
291
292 /*
293 * Also attach the dquot(s) to it, if applicable.
294 */
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500295 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100296
297 if (resblks)
298 resblks -= XFS_IALLOC_SPACE_RES(mp);
299 /*
300 * If the symlink will fit into the inode, write it inline.
301 */
302 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
Christoph Hellwig143f4ae2016-04-06 07:41:43 +1000303 xfs_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
304
Dave Chinner19de7352013-04-03 16:11:18 +1100305 ip->i_d.di_size = pathlen;
Dave Chinner19de7352013-04-03 16:11:18 +1100306 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
307 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
Dave Chinner19de7352013-04-03 16:11:18 +1100308 } else {
Dave Chinnerf948dd72013-04-03 16:11:19 +1100309 int offset;
310
Dave Chinner19de7352013-04-03 16:11:18 +1100311 first_fsb = 0;
312 nmaps = XFS_SYMLINK_MAPS;
313
314 error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
315 XFS_BMAPI_METADATA, &first_block, resblks,
316 mval, &nmaps, &free_list);
317 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100318 goto out_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100319
320 if (resblks)
321 resblks -= fs_blocks;
322 ip->i_d.di_size = pathlen;
323 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
324
325 cur_chunk = target_path;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100326 offset = 0;
Dave Chinner19de7352013-04-03 16:11:18 +1100327 for (n = 0; n < nmaps; n++) {
Dave Chinner321a9582013-05-27 16:38:20 +1000328 char *buf;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100329
Dave Chinner19de7352013-04-03 16:11:18 +1100330 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
331 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
332 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
333 BTOBB(byte_cnt), 0);
334 if (!bp) {
Dave Chinner24513372014-06-25 14:58:08 +1000335 error = -ENOMEM;
Dave Chinner58c90472015-02-23 22:38:08 +1100336 goto out_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100337 }
Dave Chinnerf948dd72013-04-03 16:11:19 +1100338 bp->b_ops = &xfs_symlink_buf_ops;
339
340 byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
Dave Chinner321a9582013-05-27 16:38:20 +1000341 byte_cnt = min(byte_cnt, pathlen);
Dave Chinner19de7352013-04-03 16:11:18 +1100342
Dave Chinnerf948dd72013-04-03 16:11:19 +1100343 buf = bp->b_addr;
344 buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
345 byte_cnt, bp);
346
347 memcpy(buf, cur_chunk, byte_cnt);
348
Dave Chinner19de7352013-04-03 16:11:18 +1100349 cur_chunk += byte_cnt;
Dave Chinnerf948dd72013-04-03 16:11:19 +1100350 pathlen -= byte_cnt;
351 offset += byte_cnt;
Dave Chinner19de7352013-04-03 16:11:18 +1100352
Dave Chinnerdaf7b792013-09-02 10:32:00 +1000353 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
Dave Chinnerf948dd72013-04-03 16:11:19 +1100354 xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
355 (char *)bp->b_addr);
Dave Chinner19de7352013-04-03 16:11:18 +1100356 }
Dave Chinner321a9582013-05-27 16:38:20 +1000357 ASSERT(pathlen == 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100358 }
359
360 /*
361 * Create the directory entry for the symlink.
362 */
363 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
364 &first_block, &free_list, resblks);
365 if (error)
Dave Chinner58c90472015-02-23 22:38:08 +1100366 goto out_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100367 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
368 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
369
370 /*
371 * If this is a synchronous mount, make sure that the
372 * symlink transaction goes to disk before returning to
373 * the user.
374 */
375 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
376 xfs_trans_set_sync(tp);
377 }
378
Eric Sandeenf6106ef2016-01-11 11:34:01 +1100379 error = xfs_bmap_finish(&tp, &free_list, NULL);
Dave Chinner58c90472015-02-23 22:38:08 +1100380 if (error)
381 goto out_bmap_cancel;
382
Christoph Hellwig70393312015-06-04 13:48:08 +1000383 error = xfs_trans_commit(tp);
Dave Chinner58c90472015-02-23 22:38:08 +1100384 if (error)
385 goto out_release_inode;
386
Dave Chinner19de7352013-04-03 16:11:18 +1100387 xfs_qm_dqrele(udqp);
388 xfs_qm_dqrele(gdqp);
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500389 xfs_qm_dqrele(pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100390
391 *ipp = ip;
392 return 0;
393
Dave Chinner58c90472015-02-23 22:38:08 +1100394out_bmap_cancel:
Dave Chinner19de7352013-04-03 16:11:18 +1100395 xfs_bmap_cancel(&free_list);
Dave Chinner58c90472015-02-23 22:38:08 +1100396out_trans_cancel:
Christoph Hellwig4906e212015-06-04 13:47:56 +1000397 xfs_trans_cancel(tp);
Dave Chinner58c90472015-02-23 22:38:08 +1100398out_release_inode:
399 /*
400 * Wait until after the current transaction is aborted to finish the
401 * setup of the inode and release the inode. This prevents recursive
402 * transactions and deadlocks from xfs_inactive.
403 */
404 if (ip) {
405 xfs_finish_inode_setup(ip);
406 IRELE(ip);
407 }
408
Dave Chinner19de7352013-04-03 16:11:18 +1100409 xfs_qm_dqrele(udqp);
410 xfs_qm_dqrele(gdqp);
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500411 xfs_qm_dqrele(pdqp);
Dave Chinner19de7352013-04-03 16:11:18 +1100412
413 if (unlock_dp_on_error)
Dave Chinnerdbad7c92015-08-19 10:33:00 +1000414 xfs_iunlock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100415 return error;
416}
417
418/*
419 * Free a symlink that has blocks associated with it.
420 */
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500421STATIC int
Dave Chinner19de7352013-04-03 16:11:18 +1100422xfs_inactive_symlink_rmt(
Brian Foster36b21dd2013-09-20 11:06:09 -0400423 struct xfs_inode *ip)
Dave Chinner19de7352013-04-03 16:11:18 +1100424{
425 xfs_buf_t *bp;
Dave Chinner19de7352013-04-03 16:11:18 +1100426 int done;
427 int error;
428 xfs_fsblock_t first_block;
429 xfs_bmap_free_t free_list;
430 int i;
431 xfs_mount_t *mp;
432 xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
433 int nmaps;
Dave Chinner19de7352013-04-03 16:11:18 +1100434 int size;
435 xfs_trans_t *tp;
436
Dave Chinner19de7352013-04-03 16:11:18 +1100437 mp = ip->i_mount;
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500438 ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
Dave Chinner19de7352013-04-03 16:11:18 +1100439 /*
440 * We're freeing a symlink that has some
441 * blocks allocated to it. Free the
442 * blocks here. We know that we've got
443 * either 1 or 2 extents and that we can
444 * free them all in one bunmapi call.
445 */
446 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
447
Christoph Hellwig253f4912016-04-06 09:19:55 +1000448 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
449 if (error)
Brian Foster36b21dd2013-09-20 11:06:09 -0400450 return error;
Brian Foster36b21dd2013-09-20 11:06:09 -0400451
452 xfs_ilock(ip, XFS_ILOCK_EXCL);
453 xfs_trans_ijoin(tp, ip, 0);
454
Dave Chinner19de7352013-04-03 16:11:18 +1100455 /*
456 * Lock the inode, fix the size, and join it to the transaction.
457 * Hold it so in the normal path, we still have it locked for
458 * the second transaction. In the error paths we need it
459 * held so the cancel won't rele it, see below.
460 */
461 size = (int)ip->i_d.di_size;
462 ip->i_d.di_size = 0;
463 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
464 /*
465 * Find the block(s) so we can inval and unmap them.
466 */
467 done = 0;
468 xfs_bmap_init(&free_list, &first_block);
469 nmaps = ARRAY_SIZE(mval);
Dave Chinnerf948dd72013-04-03 16:11:19 +1100470 error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
Dave Chinner19de7352013-04-03 16:11:18 +1100471 mval, &nmaps, 0);
472 if (error)
Brian Foster36b21dd2013-09-20 11:06:09 -0400473 goto error_trans_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100474 /*
Dave Chinnerf948dd72013-04-03 16:11:19 +1100475 * Invalidate the block(s). No validation is done.
Dave Chinner19de7352013-04-03 16:11:18 +1100476 */
477 for (i = 0; i < nmaps; i++) {
478 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
479 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
480 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
481 if (!bp) {
Dave Chinner24513372014-06-25 14:58:08 +1000482 error = -ENOMEM;
Brian Foster36b21dd2013-09-20 11:06:09 -0400483 goto error_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100484 }
485 xfs_trans_binval(tp, bp);
486 }
487 /*
488 * Unmap the dead block(s) to the free_list.
489 */
Dave Chinnerab7bb612015-07-29 11:51:01 +1000490 error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps,
Brian Foster36b21dd2013-09-20 11:06:09 -0400491 &first_block, &free_list, &done);
492 if (error)
493 goto error_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100494 ASSERT(done);
495 /*
496 * Commit the first transaction. This logs the EFI and the inode.
497 */
Eric Sandeenf6106ef2016-01-11 11:34:01 +1100498 error = xfs_bmap_finish(&tp, &free_list, ip);
Brian Foster36b21dd2013-09-20 11:06:09 -0400499 if (error)
500 goto error_bmap_cancel;
Dave Chinner19de7352013-04-03 16:11:18 +1100501 /*
Dave Chinner19de7352013-04-03 16:11:18 +1100502 * The first xact was committed, so add the inode to the new one.
503 * Mark it dirty so it will be logged and moved forward in the log as
504 * part of every commit.
505 */
506 xfs_trans_ijoin(tp, ip, 0);
507 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
508 /*
Dave Chinner19de7352013-04-03 16:11:18 +1100509 * Commit the transaction containing extent freeing and EFDs.
Dave Chinner19de7352013-04-03 16:11:18 +1100510 */
Christoph Hellwig70393312015-06-04 13:48:08 +1000511 error = xfs_trans_commit(tp);
Dave Chinner19de7352013-04-03 16:11:18 +1100512 if (error) {
513 ASSERT(XFS_FORCED_SHUTDOWN(mp));
Brian Foster36b21dd2013-09-20 11:06:09 -0400514 goto error_unlock;
Dave Chinner19de7352013-04-03 16:11:18 +1100515 }
Dave Chinner19de7352013-04-03 16:11:18 +1100516
517 /*
518 * Remove the memory for extent descriptions (just bookkeeping).
519 */
520 if (ip->i_df.if_bytes)
521 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
522 ASSERT(ip->i_df.if_bytes == 0);
Dave Chinner19de7352013-04-03 16:11:18 +1100523
Brian Foster36b21dd2013-09-20 11:06:09 -0400524 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100525 return 0;
526
Brian Foster36b21dd2013-09-20 11:06:09 -0400527error_bmap_cancel:
Dave Chinner19de7352013-04-03 16:11:18 +1100528 xfs_bmap_cancel(&free_list);
Brian Foster36b21dd2013-09-20 11:06:09 -0400529error_trans_cancel:
Christoph Hellwig4906e212015-06-04 13:47:56 +1000530 xfs_trans_cancel(tp);
Brian Foster36b21dd2013-09-20 11:06:09 -0400531error_unlock:
532 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Dave Chinner19de7352013-04-03 16:11:18 +1100533 return error;
534}
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500535
536/*
537 * xfs_inactive_symlink - free a symlink
538 */
539int
540xfs_inactive_symlink(
Brian Foster36b21dd2013-09-20 11:06:09 -0400541 struct xfs_inode *ip)
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500542{
543 struct xfs_mount *mp = ip->i_mount;
544 int pathlen;
545
546 trace_xfs_inactive_symlink(ip);
547
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500548 if (XFS_FORCED_SHUTDOWN(mp))
Dave Chinner24513372014-06-25 14:58:08 +1000549 return -EIO;
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500550
Brian Foster36b21dd2013-09-20 11:06:09 -0400551 xfs_ilock(ip, XFS_ILOCK_EXCL);
552
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500553 /*
554 * Zero length symlinks _can_ exist.
555 */
556 pathlen = (int)ip->i_d.di_size;
Brian Foster36b21dd2013-09-20 11:06:09 -0400557 if (!pathlen) {
558 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500559 return 0;
Brian Foster36b21dd2013-09-20 11:06:09 -0400560 }
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500561
562 if (pathlen < 0 || pathlen > MAXPATHLEN) {
563 xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
564 __func__, (unsigned long long)ip->i_ino, pathlen);
Brian Foster36b21dd2013-09-20 11:06:09 -0400565 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500566 ASSERT(0);
Dave Chinner24513372014-06-25 14:58:08 +1000567 return -EFSCORRUPTED;
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500568 }
569
570 if (ip->i_df.if_flags & XFS_IFINLINE) {
Brian Foster36b21dd2013-09-20 11:06:09 -0400571 if (ip->i_df.if_bytes > 0)
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500572 xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
573 XFS_DATA_FORK);
Brian Foster36b21dd2013-09-20 11:06:09 -0400574 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500575 ASSERT(ip->i_df.if_bytes == 0);
576 return 0;
577 }
578
Brian Foster36b21dd2013-09-20 11:06:09 -0400579 xfs_iunlock(ip, XFS_ILOCK_EXCL);
580
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500581 /* remove the remote symlink */
Brian Foster36b21dd2013-09-20 11:06:09 -0400582 return xfs_inactive_symlink_rmt(ip);
Mark Tinguely725eb1e2013-06-17 15:35:57 -0500583}