blob: 64981d7e73759eca66fe5729eea10090da0c2d42 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Olaf Weber3e57ecf2006-06-09 14:48:12 +10002 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
Nathan Scott7b718762005-11-02 14:58:39 +11003 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110020#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110022#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110024#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "xfs_trans.h"
26#include "xfs_sb.h"
27#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "xfs_dir2.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110030#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_bmap_btree.h"
32#include "xfs_ialloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_dinode.h"
34#include "xfs_inode.h"
35#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_itable.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_ialloc.h"
38#include "xfs_alloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "xfs_bmap.h"
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020040#include "xfs_acl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_attr.h"
42#include "xfs_rw.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "xfs_error.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include "xfs_quota.h"
45#include "xfs_utils.h"
Nathan Scotta844f452005-11-02 14:38:42 +110046#include "xfs_rtalloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "xfs_trans_space.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include "xfs_log_priv.h"
David Chinner2a82b8b2007-07-11 11:09:12 +100049#include "xfs_filestream.h"
Christoph Hellwig993386c2007-08-28 16:12:30 +100050#include "xfs_vnodeops.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000051#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053/*
Nathan Scott7d4fb402006-06-09 15:27:16 +100054 * The maximum pathlen is 1024 bytes. Since the minimum file system
55 * blocksize is 512 bytes, we can get a max of 2 extents back from
56 * bmapi.
57 */
58#define SYMLINK_MAPS 2
59
Christoph Hellwig804c83c2007-08-28 13:59:03 +100060STATIC int
61xfs_readlink_bmap(
62 xfs_inode_t *ip,
63 char *link)
64{
65 xfs_mount_t *mp = ip->i_mount;
66 int pathlen = ip->i_d.di_size;
67 int nmaps = SYMLINK_MAPS;
68 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
69 xfs_daddr_t d;
70 int byte_cnt;
71 int n;
72 xfs_buf_t *bp;
73 int error = 0;
74
Dave Chinner5c8ed202011-09-18 20:40:45 +000075 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
76 0);
Christoph Hellwig804c83c2007-08-28 13:59:03 +100077 if (error)
78 goto out;
79
80 for (n = 0; n < nmaps; n++) {
81 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
82 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
83
Christoph Hellwig6ad112b2009-11-24 18:02:23 +000084 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
85 XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK);
Chandra Seetharamanac4d6882011-08-03 02:18:29 +000086 if (!bp)
87 return XFS_ERROR(ENOMEM);
Chandra Seetharamane5702802011-08-03 02:18:34 +000088 error = bp->b_error;
Christoph Hellwig804c83c2007-08-28 13:59:03 +100089 if (error) {
Christoph Hellwig901796a2011-10-10 16:52:49 +000090 xfs_buf_ioerror_alert(bp, __func__);
Christoph Hellwig804c83c2007-08-28 13:59:03 +100091 xfs_buf_relse(bp);
92 goto out;
93 }
94 if (pathlen < byte_cnt)
95 byte_cnt = pathlen;
96 pathlen -= byte_cnt;
97
Chandra Seetharaman62926042011-07-22 23:40:15 +000098 memcpy(link, bp->b_addr, byte_cnt);
Christoph Hellwig804c83c2007-08-28 13:59:03 +100099 xfs_buf_relse(bp);
100 }
101
102 link[ip->i_d.di_size] = '\0';
103 error = 0;
104
105 out:
106 return error;
107}
108
Christoph Hellwig993386c2007-08-28 16:12:30 +1000109int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110xfs_readlink(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000111 xfs_inode_t *ip,
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000112 char *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000114 xfs_mount_t *mp = ip->i_mount;
Carlos Maiolinob52a3602011-11-07 16:10:24 +0000115 xfs_fsize_t pathlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000118 trace_xfs_readlink(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 if (XFS_FORCED_SHUTDOWN(mp))
121 return XFS_ERROR(EIO);
122
123 xfs_ilock(ip, XFS_ILOCK_SHARED);
124
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000125 pathlen = ip->i_d.di_size;
126 if (!pathlen)
127 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Carlos Maiolinob52a3602011-11-07 16:10:24 +0000129 if (pathlen < 0 || pathlen > MAXPATHLEN) {
130 xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
131 __func__, (unsigned long long) ip->i_ino,
132 (long long) pathlen);
133 ASSERT(0);
Jan Kara9b025eb2012-01-11 18:52:10 +0000134 error = XFS_ERROR(EFSCORRUPTED);
135 goto out;
Carlos Maiolinob52a3602011-11-07 16:10:24 +0000136 }
137
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 if (ip->i_df.if_flags & XFS_IFINLINE) {
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000140 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
141 link[pathlen] = '\0';
142 } else {
143 error = xfs_readlink_bmap(ip, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000146 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 xfs_iunlock(ip, XFS_ILOCK_SHARED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return error;
149}
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/*
Christoph Hellwigc56c96312009-10-19 04:03:46 +0000152 * Flags for xfs_free_eofblocks
153 */
154#define XFS_FREE_EOF_TRYLOCK (1<<0)
155
156/*
David Chinner92dfe8d2007-05-24 15:22:19 +1000157 * This is called by xfs_inactive to free any blocks beyond eof
158 * when the link count isn't zero and by xfs_dm_punch_hole() when
159 * punching a hole to EOF.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 */
Eric Sandeend96f8f82009-07-02 00:09:33 -0500161STATIC int
David Chinner92dfe8d2007-05-24 15:22:19 +1000162xfs_free_eofblocks(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 xfs_mount_t *mp,
David Chinner92dfe8d2007-05-24 15:22:19 +1000164 xfs_inode_t *ip,
165 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 xfs_trans_t *tp;
168 int error;
169 xfs_fileoff_t end_fsb;
170 xfs_fileoff_t last_fsb;
171 xfs_filblks_t map_len;
172 int nimaps;
173 xfs_bmbt_irec_t imap;
174
175 /*
176 * Figure out if there are any blocks beyond the end
177 * of the file. If not, then there is nothing to do.
178 */
Christoph Hellwigce7ae1512011-12-18 20:00:11 +0000179 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
Kulikov Vasiliy3f348852010-07-20 17:54:28 +1000181 if (last_fsb <= end_fsb)
Jesper Juhl014c2542006-01-15 02:37:08 +0100182 return 0;
Kulikov Vasiliy3f348852010-07-20 17:54:28 +1000183 map_len = last_fsb - end_fsb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 nimaps = 1;
186 xfs_ilock(ip, XFS_ILOCK_SHARED);
Dave Chinner5c8ed202011-09-18 20:40:45 +0000187 error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 xfs_iunlock(ip, XFS_ILOCK_SHARED);
189
190 if (!error && (nimaps != 0) &&
Yingping Lu68bdb6e2006-01-11 15:38:31 +1100191 (imap.br_startblock != HOLESTARTBLOCK ||
192 ip->i_delayed_blks)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 /*
194 * Attach the dquots to the inode up front.
195 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200196 error = xfs_qm_dqattach(ip, 0);
197 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +0100198 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 /*
201 * There are blocks after the end of file.
202 * Free them up now by truncating the file to
203 * its current size.
204 */
205 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
206
Christoph Hellwigc56c96312009-10-19 04:03:46 +0000207 if (flags & XFS_FREE_EOF_TRYLOCK) {
208 if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
209 xfs_trans_cancel(tp, 0);
210 return 0;
211 }
212 } else {
David Chinner92dfe8d2007-05-24 15:22:19 +1000213 xfs_ilock(ip, XFS_IOLOCK_EXCL);
Christoph Hellwigc56c96312009-10-19 04:03:46 +0000214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 error = xfs_trans_reserve(tp, 0,
217 XFS_ITRUNCATE_LOG_RES(mp),
218 0, XFS_TRANS_PERM_LOG_RES,
219 XFS_ITRUNCATE_LOG_COUNT);
220 if (error) {
221 ASSERT(XFS_FORCED_SHUTDOWN(mp));
222 xfs_trans_cancel(tp, 0);
223 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +0100224 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226
227 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwigddc34152011-09-19 15:00:54 +0000228 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Christoph Hellwig673e8e52011-12-18 20:00:04 +0000230 /*
231 * Do not update the on-disk file size. If we update the
232 * on-disk file size and then the system crashes before the
233 * contents of the file are flushed to disk then the files
234 * may be full of holes (ie NULL files bug).
235 */
236 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
Christoph Hellwigce7ae1512011-12-18 20:00:11 +0000237 XFS_ISIZE(ip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (error) {
Christoph Hellwig8f04c472011-07-08 14:34:34 +0200239 /*
240 * If we get an error at this point we simply don't
241 * bother truncating the file.
242 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 xfs_trans_cancel(tp,
244 (XFS_TRANS_RELEASE_LOG_RES |
245 XFS_TRANS_ABORT));
246 } else {
247 error = xfs_trans_commit(tp,
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000248 XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
Christoph Hellwigc56c96312009-10-19 04:03:46 +0000250 xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
Jesper Juhl014c2542006-01-15 02:37:08 +0100252 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255/*
256 * Free a symlink that has blocks associated with it.
257 */
258STATIC int
259xfs_inactive_symlink_rmt(
260 xfs_inode_t *ip,
261 xfs_trans_t **tpp)
262{
263 xfs_buf_t *bp;
264 int committed;
265 int done;
266 int error;
267 xfs_fsblock_t first_block;
268 xfs_bmap_free_t free_list;
269 int i;
270 xfs_mount_t *mp;
271 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
272 int nmaps;
273 xfs_trans_t *ntp;
274 int size;
275 xfs_trans_t *tp;
276
277 tp = *tpp;
278 mp = ip->i_mount;
279 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
280 /*
281 * We're freeing a symlink that has some
282 * blocks allocated to it. Free the
283 * blocks here. We know that we've got
284 * either 1 or 2 extents and that we can
285 * free them all in one bunmapi call.
286 */
287 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
288 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
289 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
290 ASSERT(XFS_FORCED_SHUTDOWN(mp));
291 xfs_trans_cancel(tp, 0);
292 *tpp = NULL;
293 return error;
294 }
295 /*
296 * Lock the inode, fix the size, and join it to the transaction.
297 * Hold it so in the normal path, we still have it locked for
298 * the second transaction. In the error paths we need it
299 * held so the cancel won't rele it, see below.
300 */
301 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
302 size = (int)ip->i_d.di_size;
303 ip->i_d.di_size = 0;
Christoph Hellwigddc34152011-09-19 15:00:54 +0000304 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
306 /*
307 * Find the block(s) so we can inval and unmap them.
308 */
309 done = 0;
Eric Sandeen9d87c312009-01-14 23:22:07 -0600310 xfs_bmap_init(&free_list, &first_block);
Tobias Klausere8c96f82006-03-24 03:15:34 -0800311 nmaps = ARRAY_SIZE(mval);
Dave Chinner5c8ed202011-09-18 20:40:45 +0000312 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
313 mval, &nmaps, 0);
314 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 goto error0;
316 /*
317 * Invalidate the block(s).
318 */
319 for (i = 0; i < nmaps; i++) {
320 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
321 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
322 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
Chandra Seetharaman2a30f36d2011-09-20 13:56:55 +0000323 if (!bp) {
324 error = ENOMEM;
325 goto error1;
326 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 xfs_trans_binval(tp, bp);
328 }
329 /*
330 * Unmap the dead block(s) to the free_list.
331 */
332 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000333 &first_block, &free_list, &done)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 goto error1;
335 ASSERT(done);
336 /*
337 * Commit the first transaction. This logs the EFI and the inode.
338 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100339 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 goto error1;
341 /*
342 * The transaction must have been committed, since there were
343 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
344 * The new tp has the extent freeing and EFDs.
345 */
346 ASSERT(committed);
347 /*
348 * The first xact was committed, so add the inode to the new one.
349 * Mark it dirty so it will be logged and moved forward in the log as
350 * part of every commit.
351 */
Christoph Hellwigddc34152011-09-19 15:00:54 +0000352 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
354 /*
355 * Get a new, empty transaction to return to our caller.
356 */
357 ntp = xfs_trans_dup(tp);
358 /*
Nathan Scottc41564b2006-03-29 08:55:14 +1000359 * Commit the transaction containing extent freeing and EFDs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 * If we get an error on the commit here or on the reserve below,
361 * we need to unlock the inode since the new transaction doesn't
362 * have the inode attached.
363 */
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000364 error = xfs_trans_commit(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 tp = ntp;
366 if (error) {
367 ASSERT(XFS_FORCED_SHUTDOWN(mp));
368 goto error0;
369 }
370 /*
Dave Chinnercc09c0d2008-11-17 17:37:10 +1100371 * transaction commit worked ok so we can drop the extra ticket
372 * reference that we gained in xfs_trans_dup()
373 */
374 xfs_log_ticket_put(tp->t_ticket);
375
376 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 * Remove the memory for extent descriptions (just bookkeeping).
378 */
379 if (ip->i_df.if_bytes)
380 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
381 ASSERT(ip->i_df.if_bytes == 0);
382 /*
383 * Put an itruncate log reservation in the new transaction
384 * for our caller.
385 */
386 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
387 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
388 ASSERT(XFS_FORCED_SHUTDOWN(mp));
389 goto error0;
390 }
391 /*
392 * Return with the inode locked but not joined to the transaction.
393 */
394 *tpp = tp;
395 return 0;
396
397 error1:
398 xfs_bmap_cancel(&free_list);
399 error0:
400 /*
401 * Have to come here with the inode locked and either
402 * (held and in the transaction) or (not in the transaction).
403 * If the inode isn't held then cancel would iput it, but
404 * that's wrong since this is inactive and the vnode ref
405 * count is 0 already.
406 * Cancel won't do anything to the inode if held, but it still
407 * needs to be locked until the cancel is done, if it was
408 * joined to the transaction.
409 */
410 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
411 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
412 *tpp = NULL;
413 return error;
414
415}
416
417STATIC int
418xfs_inactive_symlink_local(
419 xfs_inode_t *ip,
420 xfs_trans_t **tpp)
421{
422 int error;
423
424 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
425 /*
426 * We're freeing a symlink which fit into
427 * the inode. Just free the memory used
428 * to hold the old symlink.
429 */
430 error = xfs_trans_reserve(*tpp, 0,
431 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
432 0, XFS_TRANS_PERM_LOG_RES,
433 XFS_ITRUNCATE_LOG_COUNT);
434
435 if (error) {
436 xfs_trans_cancel(*tpp, 0);
437 *tpp = NULL;
Jesper Juhl014c2542006-01-15 02:37:08 +0100438 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 }
440 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
441
442 /*
443 * Zero length symlinks _can_ exist.
444 */
445 if (ip->i_df.if_bytes > 0) {
446 xfs_idata_realloc(ip,
447 -(ip->i_df.if_bytes),
448 XFS_DATA_FORK);
449 ASSERT(ip->i_df.if_bytes == 0);
450 }
Jesper Juhl014c2542006-01-15 02:37:08 +0100451 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454STATIC int
455xfs_inactive_attrs(
456 xfs_inode_t *ip,
457 xfs_trans_t **tpp)
458{
459 xfs_trans_t *tp;
460 int error;
461 xfs_mount_t *mp;
462
Christoph Hellwig579aa9c2008-04-22 17:34:00 +1000463 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 tp = *tpp;
465 mp = ip->i_mount;
466 ASSERT(ip->i_d.di_forkoff != 0);
David Chinnere5720ee2008-04-10 12:21:18 +1000467 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 xfs_iunlock(ip, XFS_ILOCK_EXCL);
David Chinnere5720ee2008-04-10 12:21:18 +1000469 if (error)
470 goto error_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 error = xfs_attr_inactive(ip);
David Chinnere5720ee2008-04-10 12:21:18 +1000473 if (error)
474 goto error_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
477 error = xfs_trans_reserve(tp, 0,
478 XFS_IFREE_LOG_RES(mp),
479 0, XFS_TRANS_PERM_LOG_RES,
480 XFS_INACTIVE_LOG_COUNT);
David Chinnere5720ee2008-04-10 12:21:18 +1000481 if (error)
482 goto error_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwigddc34152011-09-19 15:00:54 +0000485 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
487
488 ASSERT(ip->i_d.di_anextents == 0);
489
490 *tpp = tp;
Jesper Juhl014c2542006-01-15 02:37:08 +0100491 return 0;
David Chinnere5720ee2008-04-10 12:21:18 +1000492
493error_cancel:
494 ASSERT(XFS_FORCED_SHUTDOWN(mp));
495 xfs_trans_cancel(tp, 0);
496error_unlock:
497 *tpp = NULL;
498 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
499 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500}
501
Christoph Hellwig993386c2007-08-28 16:12:30 +1000502int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503xfs_release(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000504 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
Christoph Hellwig993386c2007-08-28 16:12:30 +1000506 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 int error;
508
Christoph Hellwig42173f62008-04-22 17:33:25 +1000509 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
512 /* If this is a read-only mount, don't do this (would generate I/O) */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000513 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 return 0;
515
David Chinner2a82b8b2007-07-11 11:09:12 +1000516 if (!XFS_FORCED_SHUTDOWN(mp)) {
Christoph Hellwigb3aea4e2007-08-29 11:44:37 +1000517 int truncated;
518
David Chinner2a82b8b2007-07-11 11:09:12 +1000519 /*
520 * If we are using filestreams, and we have an unlinked
521 * file that we are processing the last close on, then nothing
522 * will be able to reopen and write to this file. Purge this
523 * inode from the filestreams cache so that it doesn't delay
524 * teardown of the inode.
525 */
526 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
527 xfs_filestream_deassociate(ip);
528
Christoph Hellwigfbf3ce82007-06-28 16:46:47 +1000529 /*
530 * If we previously truncated this file and removed old data
531 * in the process, we want to initiate "early" writeout on
532 * the last close. This is an attempt to combat the notorious
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300533 * NULL files problem which is particularly noticeable from a
Christoph Hellwigfbf3ce82007-06-28 16:46:47 +1000534 * truncate down, buffered (re-)write (delalloc), followed by
535 * a crash. What we are effectively doing here is
536 * significantly reducing the time window where we'd otherwise
537 * be exposed to that problem.
538 */
Christoph Hellwig09262b42007-08-29 11:44:50 +1000539 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
Dave Chinnerdf4368a2011-06-23 01:35:00 +0000540 if (truncated) {
541 xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
542 if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
543 xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
544 }
Christoph Hellwigfbf3ce82007-06-28 16:46:47 +1000545 }
546
Dave Chinner6e857562010-12-23 12:02:31 +1100547 if (ip->i_d.di_nlink == 0)
548 return 0;
Christoph Hellwigc56c96312009-10-19 04:03:46 +0000549
Al Viroabbede12011-07-26 02:31:30 -0400550 if ((S_ISREG(ip->i_d.di_mode) &&
Christoph Hellwigce7ae1512011-12-18 20:00:11 +0000551 (VFS_I(ip)->i_size > 0 ||
552 (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
Dave Chinner6e857562010-12-23 12:02:31 +1100553 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
554 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
555
556 /*
557 * If we can't get the iolock just skip truncating the blocks
558 * past EOF because we could deadlock with the mmap_sem
559 * otherwise. We'll get another chance to drop them once the
560 * last reference to the inode is dropped, so we'll never leak
561 * blocks permanently.
562 *
563 * Further, check if the inode is being opened, written and
564 * closed frequently and we have delayed allocation blocks
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300565 * outstanding (e.g. streaming writes from the NFS server),
Dave Chinner6e857562010-12-23 12:02:31 +1100566 * truncating the blocks past EOF will cause fragmentation to
567 * occur.
568 *
569 * In this case don't do the truncation, either, but we have to
570 * be careful how we detect this case. Blocks beyond EOF show
571 * up as i_delayed_blks even when the inode is clean, so we
572 * need to truncate them away first before checking for a dirty
573 * release. Hence on the first dirty close we will still remove
574 * the speculative allocation, but after that we will leave it
575 * in place.
576 */
577 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
578 return 0;
579
580 error = xfs_free_eofblocks(mp, ip,
581 XFS_FREE_EOF_TRYLOCK);
582 if (error)
583 return error;
584
585 /* delalloc blocks after truncation means it really is dirty */
586 if (ip->i_delayed_blks)
587 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 return 0;
590}
591
592/*
593 * xfs_inactive
594 *
595 * This is called when the vnode reference count for the vnode
596 * goes to zero. If the file has been unlinked, then it must
597 * now be truncated. Also, we clear all of the read-ahead state
598 * kept for the inode here since the file is now closed.
599 */
Christoph Hellwig993386c2007-08-28 16:12:30 +1000600int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601xfs_inactive(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000602 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
Nathan Scott67fcaa72006-06-09 17:00:52 +1000604 xfs_bmap_free_t free_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 xfs_fsblock_t first_block;
606 int committed;
607 xfs_trans_t *tp;
608 xfs_mount_t *mp;
609 int error;
610 int truncate;
611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 /*
613 * If the inode is already free, then there can be nothing
614 * to clean up here.
615 */
Christoph Hellwigcb4c8cc2009-03-16 08:25:25 +0100616 if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 ASSERT(ip->i_df.if_real_bytes == 0);
618 ASSERT(ip->i_df.if_broot_bytes == 0);
619 return VN_INACTIVE_CACHE;
620 }
621
622 /*
623 * Only do a truncate if it's a regular file with
624 * some actual space in it. It's OK to look at the
625 * inode's fields without the lock because we're the
626 * only one with a reference to the inode.
627 */
628 truncate = ((ip->i_d.di_nlink == 0) &&
Christoph Hellwigce7ae1512011-12-18 20:00:11 +0000629 ((ip->i_d.di_size != 0) || XFS_ISIZE(ip) != 0 ||
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000630 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
Al Viroabbede12011-07-26 02:31:30 -0400631 S_ISREG(ip->i_d.di_mode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633 mp = ip->i_mount;
634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 error = 0;
636
637 /* If this is a read-only mount, don't do this (would generate I/O) */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000638 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 goto out;
640
641 if (ip->i_d.di_nlink != 0) {
Al Viroabbede12011-07-26 02:31:30 -0400642 if ((S_ISREG(ip->i_d.di_mode) &&
Christoph Hellwigce7ae1512011-12-18 20:00:11 +0000643 (VFS_I(ip)->i_size > 0 ||
644 (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
645 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
646 (!(ip->i_d.di_flags &
Nathan Scottdd9f4382006-01-11 15:28:28 +1100647 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
Christoph Hellwigce7ae1512011-12-18 20:00:11 +0000648 ip->i_delayed_blks != 0))) {
Christoph Hellwigc56c96312009-10-19 04:03:46 +0000649 error = xfs_free_eofblocks(mp, ip, 0);
David Chinner92dfe8d2007-05-24 15:22:19 +1000650 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +0100651 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 }
653 goto out;
654 }
655
656 ASSERT(ip->i_d.di_nlink == 0);
657
Christoph Hellwig7d095252009-06-08 15:33:32 +0200658 error = xfs_qm_dqattach(ip, 0);
659 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +0100660 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
663 if (truncate) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 xfs_ilock(ip, XFS_IOLOCK_EXCL);
665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 error = xfs_trans_reserve(tp, 0,
667 XFS_ITRUNCATE_LOG_RES(mp),
668 0, XFS_TRANS_PERM_LOG_RES,
669 XFS_ITRUNCATE_LOG_COUNT);
670 if (error) {
671 /* Don't call itruncate_cleanup */
672 ASSERT(XFS_FORCED_SHUTDOWN(mp));
673 xfs_trans_cancel(tp, 0);
674 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +0100675 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 }
677
678 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwigddc34152011-09-19 15:00:54 +0000679 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
Christoph Hellwig673e8e52011-12-18 20:00:04 +0000681 ip->i_d.di_size = 0;
Christoph Hellwig673e8e52011-12-18 20:00:04 +0000682 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
683
684 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 if (error) {
686 xfs_trans_cancel(tp,
687 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
688 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +0100689 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 }
Christoph Hellwig673e8e52011-12-18 20:00:04 +0000691
692 ASSERT(ip->i_d.di_nextents == 0);
Al Viroabbede12011-07-26 02:31:30 -0400693 } else if (S_ISLNK(ip->i_d.di_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
695 /*
696 * If we get an error while cleaning up a
697 * symlink we bail out.
698 */
699 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
700 xfs_inactive_symlink_rmt(ip, &tp) :
701 xfs_inactive_symlink_local(ip, &tp);
702
703 if (error) {
704 ASSERT(tp == NULL);
Jesper Juhl014c2542006-01-15 02:37:08 +0100705 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 }
707
Christoph Hellwigddc34152011-09-19 15:00:54 +0000708 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 } else {
710 error = xfs_trans_reserve(tp, 0,
711 XFS_IFREE_LOG_RES(mp),
712 0, XFS_TRANS_PERM_LOG_RES,
713 XFS_INACTIVE_LOG_COUNT);
714 if (error) {
715 ASSERT(XFS_FORCED_SHUTDOWN(mp));
716 xfs_trans_cancel(tp, 0);
Jesper Juhl014c2542006-01-15 02:37:08 +0100717 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 }
719
720 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
Christoph Hellwigddc34152011-09-19 15:00:54 +0000721 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 }
723
724 /*
725 * If there are attributes associated with the file
726 * then blow them away now. The code calls a routine
727 * that recursively deconstructs the attribute fork.
728 * We need to just commit the current transaction
729 * because we can't use it for xfs_attr_inactive().
730 */
731 if (ip->i_d.di_anextents > 0) {
732 error = xfs_inactive_attrs(ip, &tp);
733 /*
734 * If we got an error, the transaction is already
735 * cancelled, and the inode is unlocked. Just get out.
736 */
737 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +0100738 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 } else if (ip->i_afp) {
740 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
741 }
742
743 /*
744 * Free the inode.
745 */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600746 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 error = xfs_ifree(tp, ip, &free_list);
748 if (error) {
749 /*
750 * If we fail to free the inode, shut down. The cancel
751 * might do that, we need to make sure. Otherwise the
752 * inode might be lost for a long time or forever.
753 */
754 if (!XFS_FORCED_SHUTDOWN(mp)) {
Dave Chinner0b932cc2011-03-07 10:08:35 +1100755 xfs_notice(mp, "%s: xfs_ifree returned error %d",
756 __func__, error);
Nathan Scott7d04a332006-06-09 14:58:38 +1000757 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
759 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
760 } else {
761 /*
762 * Credit the quota account(s). The inode is gone.
763 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200764 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
766 /*
David Chinner78e9da72008-04-10 12:24:17 +1000767 * Just ignore errors at this point. There is nothing we can
768 * do except to try to keep going. Make sure it's not a silent
769 * error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 */
David Chinner78e9da72008-04-10 12:24:17 +1000771 error = xfs_bmap_finish(&tp, &free_list, &committed);
772 if (error)
Dave Chinner53487782011-03-07 10:05:35 +1100773 xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
774 __func__, error);
David Chinner78e9da72008-04-10 12:24:17 +1000775 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
776 if (error)
Dave Chinner53487782011-03-07 10:05:35 +1100777 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
778 __func__, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
Christoph Hellwig7d095252009-06-08 15:33:32 +0200780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 /*
782 * Release the dquots held by inode, if any.
783 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200784 xfs_qm_dqdetach(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
786
787 out:
788 return VN_INACTIVE_CACHE;
789}
790
Barry Naujok384f3ce2008-05-21 16:58:22 +1000791/*
792 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
793 * is allowed, otherwise it has to be an exact match. If a CI match is found,
794 * ci_name->name will point to a the actual name (caller must free) or
795 * will be set to NULL if an exact match is found.
796 */
Christoph Hellwig993386c2007-08-28 16:12:30 +1000797int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798xfs_lookup(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000799 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000800 struct xfs_name *name,
Barry Naujok384f3ce2008-05-21 16:58:22 +1000801 xfs_inode_t **ipp,
802 struct xfs_name *ci_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Christoph Hellwigeca450b2008-04-22 17:33:52 +1000804 xfs_ino_t inum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 int error;
806 uint lock_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000808 trace_xfs_lookup(dp, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
811 return XFS_ERROR(EIO);
812
813 lock_mode = xfs_ilock_map_shared(dp);
Barry Naujok384f3ce2008-05-21 16:58:22 +1000814 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 xfs_iunlock_map_shared(dp, lock_mode);
Christoph Hellwigeca450b2008-04-22 17:33:52 +1000816
817 if (error)
818 goto out;
819
Dave Chinner7b6259e2010-06-24 11:35:17 +1000820 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
Christoph Hellwigeca450b2008-04-22 17:33:52 +1000821 if (error)
Barry Naujok384f3ce2008-05-21 16:58:22 +1000822 goto out_free_name;
Christoph Hellwigeca450b2008-04-22 17:33:52 +1000823
Christoph Hellwigeca450b2008-04-22 17:33:52 +1000824 return 0;
825
Barry Naujok384f3ce2008-05-21 16:58:22 +1000826out_free_name:
827 if (ci_name)
828 kmem_free(ci_name->name);
829out:
Christoph Hellwigeca450b2008-04-22 17:33:52 +1000830 *ipp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 return error;
832}
833
Christoph Hellwig993386c2007-08-28 16:12:30 +1000834int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835xfs_create(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000836 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000837 struct xfs_name *name,
Al Viro576b1d62011-07-26 02:50:15 -0400838 umode_t mode,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +1000839 xfs_dev_t rdev,
Christoph Hellwig6c77b0e2010-10-06 18:41:17 +0000840 xfs_inode_t **ipp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841{
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100842 int is_dir = S_ISDIR(mode);
843 struct xfs_mount *mp = dp->i_mount;
844 struct xfs_inode *ip = NULL;
845 struct xfs_trans *tp = NULL;
Barry Naujok556b8b12008-04-10 12:22:07 +1000846 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 xfs_bmap_free_t free_list;
848 xfs_fsblock_t first_block;
Christoph Hellwig993386c2007-08-28 16:12:30 +1000849 boolean_t unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 uint cancel_flags;
851 int committed;
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +0000852 prid_t prid;
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100853 struct xfs_dquot *udqp = NULL;
854 struct xfs_dquot *gdqp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 uint resblks;
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100856 uint log_res;
857 uint log_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000859 trace_xfs_create(dp, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100861 if (XFS_FORCED_SHUTDOWN(mp))
862 return XFS_ERROR(EIO);
863
Nathan Scott365ca832005-06-21 15:39:12 +1000864 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +0000865 prid = xfs_get_projid(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 else
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +0000867 prid = XFS_PROJID_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 /*
870 * Make sure that we have allocated dquot(s) on disk.
871 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200872 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100873 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 if (error)
Christoph Hellwigec3ba852011-02-13 13:26:42 +0000875 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100877 if (is_dir) {
878 rdev = 0;
879 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
880 log_res = XFS_MKDIR_LOG_RES(mp);
881 log_count = XFS_MKDIR_LOG_COUNT;
882 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
883 } else {
884 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
885 log_res = XFS_CREATE_LOG_RES(mp);
886 log_count = XFS_CREATE_LOG_COUNT;
887 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
888 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 /*
893 * Initially assume that the file does not exist and
894 * reserve the resources for that case. If that is not
895 * the case we'll drop the one we have and get a more
896 * appropriate transaction later.
897 */
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100898 error = xfs_trans_reserve(tp, resblks, log_res, 0,
899 XFS_TRANS_PERM_LOG_RES, log_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 if (error == ENOSPC) {
Dave Chinner153fec42009-04-06 18:48:30 +0200901 /* flush outstanding delalloc blocks and retry */
902 xfs_flush_inodes(dp);
Christoph Hellwig4734d402009-09-09 18:19:02 -0500903 error = xfs_trans_reserve(tp, resblks, log_res, 0,
904 XFS_TRANS_PERM_LOG_RES, log_count);
Dave Chinner153fec42009-04-06 18:48:30 +0200905 }
906 if (error == ENOSPC) {
907 /* No space at all so try a "no-allocation" reservation */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 resblks = 0;
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100909 error = xfs_trans_reserve(tp, 0, log_res, 0,
910 XFS_TRANS_PERM_LOG_RES, log_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 }
912 if (error) {
913 cancel_flags = 0;
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100914 goto out_trans_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 }
916
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +1000917 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
Christoph Hellwig993386c2007-08-28 16:12:30 +1000918 unlock_dp_on_error = B_TRUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100920 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
922 /*
923 * Reserve disk quota and the inode.
924 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200925 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (error)
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100927 goto out_trans_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Barry Naujok556b8b12008-04-10 12:22:07 +1000929 error = xfs_dir_canenter(tp, dp, name, resblks);
930 if (error)
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100931 goto out_trans_cancel;
932
933 /*
934 * A newly created regular or special file just has one directory
935 * entry pointing to them, but a directory also the "." entry
936 * pointing to itself.
937 */
Christoph Hellwig6c77b0e2010-10-06 18:41:17 +0000938 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100939 prid, resblks > 0, &ip, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 if (error) {
941 if (error == ENOSPC)
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100942 goto out_trans_cancel;
943 goto out_trans_abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 /*
Christoph Hellwig993386c2007-08-28 16:12:30 +1000947 * Now we join the directory inode to the transaction. We do not do it
948 * earlier because xfs_dir_ialloc might commit the previous transaction
949 * (and release all the locks). An error from here on will result in
950 * the transaction cancel unlocking dp so don't do it explicitly in the
951 * error path.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 */
Christoph Hellwigddc34152011-09-19 15:00:54 +0000953 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
Christoph Hellwig993386c2007-08-28 16:12:30 +1000954 unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Barry Naujok556b8b12008-04-10 12:22:07 +1000956 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000957 &first_block, &free_list, resblks ?
958 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 if (error) {
960 ASSERT(error != ENOSPC);
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100961 goto out_trans_abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 }
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000963 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
965
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100966 if (is_dir) {
967 error = xfs_dir_init(tp, ip, dp);
968 if (error)
969 goto out_bmap_cancel;
970
971 error = xfs_bumplink(tp, dp);
972 if (error)
973 goto out_bmap_cancel;
974 }
975
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 /*
977 * If this is a synchronous mount, make sure that the
978 * create transaction goes to disk before returning to
979 * the user.
980 */
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100981 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 xfs_trans_set_sync(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 /*
985 * Attach the dquot(s) to the inodes and modify them incore.
986 * These ids of the inode couldn't have changed since the new
987 * inode has been locked ever since it was created.
988 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200989 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100991 error = xfs_bmap_finish(&tp, &free_list, &committed);
Christoph Hellwig517b5e82009-02-09 08:38:02 +0100992 if (error)
Christoph Hellwigec3ba852011-02-13 13:26:42 +0000993 goto out_bmap_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000995 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Christoph Hellwigec3ba852011-02-13 13:26:42 +0000996 if (error)
997 goto out_release_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
Christoph Hellwig7d095252009-06-08 15:33:32 +0200999 xfs_qm_dqrele(udqp);
1000 xfs_qm_dqrele(gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
Christoph Hellwig979ebab2008-03-06 13:46:05 +11001002 *ipp = ip;
Christoph Hellwig288699f2010-06-23 18:11:15 +10001003 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
Christoph Hellwig517b5e82009-02-09 08:38:02 +01001005 out_bmap_cancel:
1006 xfs_bmap_cancel(&free_list);
1007 out_trans_abort:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 cancel_flags |= XFS_TRANS_ABORT;
Christoph Hellwig517b5e82009-02-09 08:38:02 +01001009 out_trans_cancel:
1010 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwigec3ba852011-02-13 13:26:42 +00001011 out_release_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 /*
1013 * Wait until after the current transaction is aborted to
1014 * release the inode. This prevents recursive transactions
1015 * and deadlocks from xfs_inactive.
1016 */
Christoph Hellwigec3ba852011-02-13 13:26:42 +00001017 if (ip)
1018 IRELE(ip);
1019
1020 xfs_qm_dqrele(udqp);
1021 xfs_qm_dqrele(gdqp);
1022
1023 if (unlock_dp_on_error)
1024 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1025 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026}
1027
1028#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029int xfs_locked_n;
1030int xfs_small_retries;
1031int xfs_middle_retries;
1032int xfs_lots_retries;
1033int xfs_lock_delays;
1034#endif
1035
1036/*
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001037 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1038 * a different value
1039 */
1040static inline int
1041xfs_lock_inumorder(int lock_mode, int subclass)
1042{
1043 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
David Chinner0f1145c2007-06-29 17:26:09 +10001044 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001045 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
David Chinner0f1145c2007-06-29 17:26:09 +10001046 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001047
1048 return lock_mode;
1049}
1050
1051/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 * The following routine will lock n inodes in exclusive mode.
1053 * We assume the caller calls us with the inodes in i_ino order.
1054 *
1055 * We need to detect deadlock where an inode that we lock
1056 * is in the AIL and we start waiting for another inode that is locked
1057 * by a thread in a long running transaction (such as truncate). This can
1058 * result in deadlock since the long running trans might need to wait
1059 * for the inode we just locked in order to push the tail and free space
1060 * in the log.
1061 */
1062void
1063xfs_lock_inodes(
1064 xfs_inode_t **ips,
1065 int inodes,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 uint lock_mode)
1067{
1068 int attempts = 0, i, j, try_lock;
1069 xfs_log_item_t *lp;
1070
1071 ASSERT(ips && (inodes >= 2)); /* we need at least two */
1072
Christoph Hellwigcfa853e2008-04-22 17:34:06 +10001073 try_lock = 0;
1074 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
1076again:
1077 for (; i < inodes; i++) {
1078 ASSERT(ips[i]);
1079
1080 if (i && (ips[i] == ips[i-1])) /* Already locked */
1081 continue;
1082
1083 /*
1084 * If try_lock is not set yet, make sure all locked inodes
1085 * are not in the AIL.
1086 * If any are, set try_lock to be used later.
1087 */
1088
1089 if (!try_lock) {
1090 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1091 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1092 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1093 try_lock++;
1094 }
1095 }
1096 }
1097
1098 /*
1099 * If any of the previous locks we have locked is in the AIL,
1100 * we must TRY to get the second and subsequent locks. If
1101 * we can't get any, we must release all we have
1102 * and try again.
1103 */
1104
1105 if (try_lock) {
1106 /* try_lock must be 0 if i is 0. */
1107 /*
1108 * try_lock means we have an inode locked
1109 * that is in the AIL.
1110 */
1111 ASSERT(i != 0);
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001112 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 attempts++;
1114
1115 /*
1116 * Unlock all previous guys and try again.
1117 * xfs_iunlock will try to push the tail
1118 * if the inode is in the AIL.
1119 */
1120
1121 for(j = i - 1; j >= 0; j--) {
1122
1123 /*
1124 * Check to see if we've already
1125 * unlocked this one.
1126 * Not the first one going back,
1127 * and the inode ptr is the same.
1128 */
1129 if ((j != (i - 1)) && ips[j] ==
1130 ips[j+1])
1131 continue;
1132
1133 xfs_iunlock(ips[j], lock_mode);
1134 }
1135
1136 if ((attempts % 5) == 0) {
1137 delay(1); /* Don't just spin the CPU */
1138#ifdef DEBUG
1139 xfs_lock_delays++;
1140#endif
1141 }
1142 i = 0;
1143 try_lock = 0;
1144 goto again;
1145 }
1146 } else {
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001147 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 }
1149 }
1150
1151#ifdef DEBUG
1152 if (attempts) {
1153 if (attempts < 5) xfs_small_retries++;
1154 else if (attempts < 100) xfs_middle_retries++;
1155 else xfs_lots_retries++;
1156 } else {
1157 xfs_locked_n++;
1158 }
1159#endif
1160}
1161
David Chinnerf9114eb2008-09-17 16:51:21 +10001162/*
1163 * xfs_lock_two_inodes() can only be used to lock one type of lock
1164 * at a time - the iolock or the ilock, but not both at once. If
1165 * we lock both at once, lockdep will report false positives saying
1166 * we have violated locking orders.
1167 */
Christoph Hellwige1cccd92008-08-13 16:18:07 +10001168void
1169xfs_lock_two_inodes(
1170 xfs_inode_t *ip0,
1171 xfs_inode_t *ip1,
1172 uint lock_mode)
1173{
1174 xfs_inode_t *temp;
1175 int attempts = 0;
1176 xfs_log_item_t *lp;
1177
David Chinnerf9114eb2008-09-17 16:51:21 +10001178 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1179 ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
Christoph Hellwige1cccd92008-08-13 16:18:07 +10001180 ASSERT(ip0->i_ino != ip1->i_ino);
1181
1182 if (ip0->i_ino > ip1->i_ino) {
1183 temp = ip0;
1184 ip0 = ip1;
1185 ip1 = temp;
1186 }
1187
1188 again:
1189 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1190
1191 /*
1192 * If the first lock we have locked is in the AIL, we must TRY to get
1193 * the second lock. If we can't get it, we must release the first one
1194 * and try again.
1195 */
1196 lp = (xfs_log_item_t *)ip0->i_itemp;
1197 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1198 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1199 xfs_iunlock(ip0, lock_mode);
1200 if ((++attempts % 5) == 0)
1201 delay(1); /* Don't just spin the CPU */
1202 goto again;
1203 }
1204 } else {
1205 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1206 }
1207}
1208
Christoph Hellwig993386c2007-08-28 16:12:30 +10001209int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210xfs_remove(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001211 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +10001212 struct xfs_name *name,
1213 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001215 xfs_mount_t *mp = dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 xfs_trans_t *tp = NULL;
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001217 int is_dir = S_ISDIR(ip->i_d.di_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 int error = 0;
1219 xfs_bmap_free_t free_list;
1220 xfs_fsblock_t first_block;
1221 int cancel_flags;
1222 int committed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 int link_zero;
1224 uint resblks;
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001225 uint log_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
Christoph Hellwigcca28fb2010-06-24 11:57:09 +10001227 trace_xfs_remove(dp, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 if (XFS_FORCED_SHUTDOWN(mp))
1230 return XFS_ERROR(EIO);
1231
Christoph Hellwig7d095252009-06-08 15:33:32 +02001232 error = xfs_qm_dqattach(dp, 0);
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001233 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
Christoph Hellwig7d095252009-06-08 15:33:32 +02001236 error = xfs_qm_dqattach(ip, 0);
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001237 if (error)
1238 goto std_return;
1239
1240 if (is_dir) {
1241 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1242 log_count = XFS_DEFAULT_LOG_COUNT;
1243 } else {
1244 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1245 log_count = XFS_REMOVE_LOG_COUNT;
1246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 /*
1250 * We try to get the real space reservation first,
1251 * allowing for directory btree deletion(s) implying
1252 * possible bmap insert(s). If we can't get the space
1253 * reservation then we use 0 instead, and avoid the bmap
1254 * btree insert(s) in the directory code by, if the bmap
1255 * insert tries to happen, instead trimming the LAST
1256 * block from the directory.
1257 */
1258 resblks = XFS_REMOVE_SPACE_RES(mp);
1259 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001260 XFS_TRANS_PERM_LOG_RES, log_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 if (error == ENOSPC) {
1262 resblks = 0;
1263 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001264 XFS_TRANS_PERM_LOG_RES, log_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 }
1266 if (error) {
1267 ASSERT(error != ENOSPC);
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001268 cancel_flags = 0;
1269 goto out_trans_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 }
1271
Christoph Hellwige1cccd92008-08-13 16:18:07 +10001272 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
Christoph Hellwigddc34152011-09-19 15:00:54 +00001274 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1275 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
1277 /*
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001278 * If we're removing a directory perform some additional validation.
1279 */
1280 if (is_dir) {
1281 ASSERT(ip->i_d.di_nlink >= 2);
1282 if (ip->i_d.di_nlink != 2) {
1283 error = XFS_ERROR(ENOTEMPTY);
1284 goto out_trans_cancel;
1285 }
1286 if (!xfs_dir_isempty(ip)) {
1287 error = XFS_ERROR(ENOTEMPTY);
1288 goto out_trans_cancel;
1289 }
1290 }
1291
Eric Sandeen9d87c312009-01-14 23:22:07 -06001292 xfs_bmap_init(&free_list, &first_block);
Barry Naujok556b8b12008-04-10 12:22:07 +10001293 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
Christoph Hellwigd4377d82008-04-22 17:33:46 +10001294 &first_block, &free_list, resblks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 if (error) {
1296 ASSERT(error != ENOENT);
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001297 goto out_bmap_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 }
Dave Chinnerdcd79a12010-09-28 12:27:25 +10001299 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001301 if (is_dir) {
1302 /*
1303 * Drop the link from ip's "..".
1304 */
1305 error = xfs_droplink(tp, dp);
1306 if (error)
1307 goto out_bmap_cancel;
1308
1309 /*
Christoph Hellwig2b7035f2008-10-30 17:55:18 +11001310 * Drop the "." link from ip to self.
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001311 */
1312 error = xfs_droplink(tp, ip);
1313 if (error)
1314 goto out_bmap_cancel;
1315 } else {
1316 /*
1317 * When removing a non-directory we need to log the parent
Dave Chinner26c52952008-11-28 14:23:37 +11001318 * inode here. For a directory this is done implicitly
1319 * by the xfs_droplink call for the ".." entry.
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001320 */
1321 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 }
1323
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001324 /*
Christoph Hellwig2b7035f2008-10-30 17:55:18 +11001325 * Drop the link from dp to ip.
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001326 */
1327 error = xfs_droplink(tp, ip);
1328 if (error)
1329 goto out_bmap_cancel;
1330
1331 /*
1332 * Determine if this is the last link while
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 * we are in the transaction.
1334 */
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001335 link_zero = (ip->i_d.di_nlink == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336
1337 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 * If this is a synchronous mount, make sure that the
1339 * remove transaction goes to disk before returning to
1340 * the user.
1341 */
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001342 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 xfs_trans_set_sync(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001345 error = xfs_bmap_finish(&tp, &free_list, &committed);
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001346 if (error)
1347 goto out_bmap_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001349 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Christoph Hellwig5df78e72008-04-22 17:34:24 +10001350 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
1353 /*
David Chinner2a82b8b2007-07-11 11:09:12 +10001354 * If we are using filestreams, kill the stream association.
1355 * If the file is still open it may get a new one but that
1356 * will get killed on last close in xfs_close() so we don't
1357 * have to worry about that.
1358 */
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001359 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
David Chinner2a82b8b2007-07-11 11:09:12 +10001360 xfs_filestream_deassociate(ip);
1361
Christoph Hellwig288699f2010-06-23 18:11:15 +10001362 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001364 out_bmap_cancel:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 xfs_bmap_cancel(&free_list);
1366 cancel_flags |= XFS_TRANS_ABORT;
Christoph Hellwig8f112e32008-06-23 13:25:17 +10001367 out_trans_cancel:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig288699f2010-06-23 18:11:15 +10001369 std_return:
1370 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371}
1372
Christoph Hellwig993386c2007-08-28 16:12:30 +10001373int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374xfs_link(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001375 xfs_inode_t *tdp,
Christoph Hellwiga3da7892008-03-06 13:46:12 +11001376 xfs_inode_t *sip,
Barry Naujok556b8b12008-04-10 12:22:07 +10001377 struct xfs_name *target_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001379 xfs_mount_t *mp = tdp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 int error;
1382 xfs_bmap_free_t free_list;
1383 xfs_fsblock_t first_block;
1384 int cancel_flags;
1385 int committed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 int resblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
Christoph Hellwigcca28fb2010-06-24 11:57:09 +10001388 trace_xfs_link(tdp, target_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389
Christoph Hellwiga3da7892008-03-06 13:46:12 +11001390 ASSERT(!S_ISDIR(sip->i_d.di_mode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 if (XFS_FORCED_SHUTDOWN(mp))
1393 return XFS_ERROR(EIO);
1394
Christoph Hellwig7d095252009-06-08 15:33:32 +02001395 error = xfs_qm_dqattach(sip, 0);
Christoph Hellwigcb3f35b2009-02-04 09:34:20 +01001396 if (error)
1397 goto std_return;
1398
Christoph Hellwig7d095252009-06-08 15:33:32 +02001399 error = xfs_qm_dqattach(tdp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 if (error)
1401 goto std_return;
1402
1403 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
1404 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Barry Naujok556b8b12008-04-10 12:22:07 +10001405 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
1407 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1408 if (error == ENOSPC) {
1409 resblks = 0;
1410 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
1411 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1412 }
1413 if (error) {
1414 cancel_flags = 0;
1415 goto error_return;
1416 }
1417
Christoph Hellwige1cccd92008-08-13 16:18:07 +10001418 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
Christoph Hellwigddc34152011-09-19 15:00:54 +00001420 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
1421 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423 /*
Nathan Scott365ca832005-06-21 15:39:12 +10001424 * If we are using project inheritance, we only allow hard link
1425 * creation in our tree when the project IDs are the same; else
1426 * the tree quota mechanism could be circumvented.
1427 */
1428 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +00001429 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
Nathan Scottb1ecdda2006-05-08 19:51:42 +10001430 error = XFS_ERROR(EXDEV);
Nathan Scott365ca832005-06-21 15:39:12 +10001431 goto error_return;
1432 }
1433
Barry Naujok556b8b12008-04-10 12:22:07 +10001434 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
1435 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 goto error_return;
1437
Eric Sandeen9d87c312009-01-14 23:22:07 -06001438 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439
Barry Naujok556b8b12008-04-10 12:22:07 +10001440 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1441 &first_block, &free_list, resblks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 if (error)
1443 goto abort_return;
Dave Chinnerdcd79a12010-09-28 12:27:25 +10001444 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1446
1447 error = xfs_bumplink(tp, sip);
Alexey Dobriyanb71d3002006-06-27 12:45:17 +10001448 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
1451 /*
1452 * If this is a synchronous mount, make sure that the
1453 * link transaction goes to disk before returning to
1454 * the user.
1455 */
1456 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1457 xfs_trans_set_sync(tp);
1458 }
1459
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001460 error = xfs_bmap_finish (&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 if (error) {
1462 xfs_bmap_cancel(&free_list);
1463 goto abort_return;
1464 }
1465
Christoph Hellwig288699f2010-06-23 18:11:15 +10001466 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
1468 abort_return:
1469 cancel_flags |= XFS_TRANS_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 error_return:
1471 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig288699f2010-06-23 18:11:15 +10001472 std_return:
1473 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474}
Alexey Dobriyanb71d3002006-06-27 12:45:17 +10001475
Christoph Hellwig993386c2007-08-28 16:12:30 +10001476int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477xfs_symlink(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001478 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +10001479 struct xfs_name *link_name,
1480 const char *target_path,
Al Viro576b1d62011-07-26 02:50:15 -04001481 umode_t mode,
Christoph Hellwig6c77b0e2010-10-06 18:41:17 +00001482 xfs_inode_t **ipp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001484 xfs_mount_t *mp = dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 xfs_inode_t *ip;
1487 int error;
1488 int pathlen;
1489 xfs_bmap_free_t free_list;
1490 xfs_fsblock_t first_block;
Christoph Hellwig993386c2007-08-28 16:12:30 +10001491 boolean_t unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 uint cancel_flags;
1493 int committed;
1494 xfs_fileoff_t first_fsb;
1495 xfs_filblks_t fs_blocks;
1496 int nmaps;
1497 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1498 xfs_daddr_t d;
Barry Naujok556b8b12008-04-10 12:22:07 +10001499 const char *cur_chunk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 int byte_cnt;
1501 int n;
1502 xfs_buf_t *bp;
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +00001503 prid_t prid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 struct xfs_dquot *udqp, *gdqp;
1505 uint resblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Christoph Hellwig3937be52008-03-06 13:46:19 +11001507 *ipp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 error = 0;
1509 ip = NULL;
1510 tp = NULL;
1511
Christoph Hellwigcca28fb2010-06-24 11:57:09 +10001512 trace_xfs_symlink(dp, link_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
1514 if (XFS_FORCED_SHUTDOWN(mp))
1515 return XFS_ERROR(EIO);
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 /*
1518 * Check component lengths of the target path name.
1519 */
1520 pathlen = strlen(target_path);
1521 if (pathlen >= MAXPATHLEN) /* total string too long */
1522 return XFS_ERROR(ENAMETOOLONG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10001525 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +00001526 prid = xfs_get_projid(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 else
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +00001528 prid = XFS_PROJID_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
1530 /*
1531 * Make sure that we have allocated dquot(s) on disk.
1532 */
Christoph Hellwig7d095252009-06-08 15:33:32 +02001533 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
1535 if (error)
1536 goto std_return;
1537
1538 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
1539 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1540 /*
1541 * The symlink will fit into the inode data fork?
1542 * There can't be any attributes so we get the whole variable part.
1543 */
1544 if (pathlen <= XFS_LITINO(mp))
1545 fs_blocks = 0;
1546 else
1547 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
Barry Naujok556b8b12008-04-10 12:22:07 +10001548 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
1550 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1551 if (error == ENOSPC && fs_blocks == 0) {
1552 resblks = 0;
1553 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
1554 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1555 }
1556 if (error) {
1557 cancel_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 goto error_return;
1559 }
1560
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001561 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
Christoph Hellwig993386c2007-08-28 16:12:30 +10001562 unlock_dp_on_error = B_TRUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
1564 /*
1565 * Check whether the directory allows new symlinks or not.
1566 */
1567 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
1568 error = XFS_ERROR(EPERM);
1569 goto error_return;
1570 }
1571
1572 /*
1573 * Reserve disk quota : blocks and inode.
1574 */
Christoph Hellwig7d095252009-06-08 15:33:32 +02001575 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 if (error)
1577 goto error_return;
1578
1579 /*
1580 * Check for ability to enter directory entry, if no space reserved.
1581 */
Barry Naujok556b8b12008-04-10 12:22:07 +10001582 error = xfs_dir_canenter(tp, dp, link_name, resblks);
1583 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 goto error_return;
1585 /*
1586 * Initialize the bmap freelist prior to calling either
1587 * bmapi or the directory create code.
1588 */
Eric Sandeen9d87c312009-01-14 23:22:07 -06001589 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590
1591 /*
1592 * Allocate an inode for the symlink.
1593 */
Christoph Hellwig6c77b0e2010-10-06 18:41:17 +00001594 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
1595 prid, resblks > 0, &ip, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 if (error) {
1597 if (error == ENOSPC)
1598 goto error_return;
1599 goto error1;
1600 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
Christoph Hellwig993386c2007-08-28 16:12:30 +10001602 /*
1603 * An error after we've joined dp to the transaction will result in the
1604 * transaction cancel unlocking dp so don't do it explicitly in the
1605 * error path.
1606 */
Christoph Hellwigddc34152011-09-19 15:00:54 +00001607 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
Christoph Hellwig993386c2007-08-28 16:12:30 +10001608 unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
1610 /*
1611 * Also attach the dquot(s) to it, if applicable.
1612 */
Christoph Hellwig7d095252009-06-08 15:33:32 +02001613 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614
1615 if (resblks)
1616 resblks -= XFS_IALLOC_SPACE_RES(mp);
1617 /*
1618 * If the symlink will fit into the inode, write it inline.
1619 */
1620 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
1621 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
1622 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
1623 ip->i_d.di_size = pathlen;
1624
1625 /*
1626 * The inode was initially created in extent format.
1627 */
1628 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
1629 ip->i_df.if_flags |= XFS_IFINLINE;
1630
1631 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
1632 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
1633
1634 } else {
1635 first_fsb = 0;
1636 nmaps = SYMLINK_MAPS;
1637
Dave Chinnerc0dc7822011-09-18 20:40:52 +00001638 error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
1639 XFS_BMAPI_METADATA, &first_block, resblks,
1640 mval, &nmaps, &free_list);
Christoph Hellwigec3ba852011-02-13 13:26:42 +00001641 if (error)
1642 goto error2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643
1644 if (resblks)
1645 resblks -= fs_blocks;
1646 ip->i_d.di_size = pathlen;
1647 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1648
1649 cur_chunk = target_path;
1650 for (n = 0; n < nmaps; n++) {
1651 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
1652 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
1653 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
1654 BTOBB(byte_cnt), 0);
Chandra Seetharaman2a30f36d2011-09-20 13:56:55 +00001655 if (!bp) {
1656 error = ENOMEM;
1657 goto error2;
1658 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 if (pathlen < byte_cnt) {
1660 byte_cnt = pathlen;
1661 }
1662 pathlen -= byte_cnt;
1663
Chandra Seetharaman62926042011-07-22 23:40:15 +00001664 memcpy(bp->b_addr, cur_chunk, byte_cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 cur_chunk += byte_cnt;
1666
1667 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
1668 }
1669 }
1670
1671 /*
1672 * Create the directory entry for the symlink.
1673 */
Barry Naujok556b8b12008-04-10 12:22:07 +10001674 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
1675 &first_block, &free_list, resblks);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10001676 if (error)
Christoph Hellwigec3ba852011-02-13 13:26:42 +00001677 goto error2;
Dave Chinnerdcd79a12010-09-28 12:27:25 +10001678 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1680
1681 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 * If this is a synchronous mount, make sure that the
1683 * symlink transaction goes to disk before returning to
1684 * the user.
1685 */
1686 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1687 xfs_trans_set_sync(tp);
1688 }
1689
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001690 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 if (error) {
1692 goto error2;
1693 }
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001694 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Christoph Hellwig7d095252009-06-08 15:33:32 +02001695 xfs_qm_dqrele(udqp);
1696 xfs_qm_dqrele(gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697
Christoph Hellwig288699f2010-06-23 18:11:15 +10001698 *ipp = ip;
1699 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700
1701 error2:
1702 IRELE(ip);
1703 error1:
1704 xfs_bmap_cancel(&free_list);
1705 cancel_flags |= XFS_TRANS_ABORT;
1706 error_return:
1707 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig7d095252009-06-08 15:33:32 +02001708 xfs_qm_dqrele(udqp);
1709 xfs_qm_dqrele(gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710
Christoph Hellwig993386c2007-08-28 16:12:30 +10001711 if (unlock_dp_on_error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 xfs_iunlock(dp, XFS_ILOCK_EXCL);
Christoph Hellwig288699f2010-06-23 18:11:15 +10001713 std_return:
1714 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715}
1716
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717int
Christoph Hellwig993386c2007-08-28 16:12:30 +10001718xfs_set_dmattrs(
1719 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 u_int evmask,
Christoph Hellwig993386c2007-08-28 16:12:30 +10001721 u_int16_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001723 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 int error;
1726
1727 if (!capable(CAP_SYS_ADMIN))
1728 return XFS_ERROR(EPERM);
1729
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 if (XFS_FORCED_SHUTDOWN(mp))
1731 return XFS_ERROR(EIO);
1732
1733 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
1734 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
1735 if (error) {
1736 xfs_trans_cancel(tp, 0);
1737 return error;
1738 }
1739 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwigddc34152011-09-19 15:00:54 +00001740 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741
Christoph Hellwig613d7042007-10-11 17:44:08 +10001742 ip->i_d.di_dmevmask = evmask;
1743 ip->i_d.di_dmstate = state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
1745 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001746 error = xfs_trans_commit(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747
1748 return error;
1749}
1750
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751/*
1752 * xfs_alloc_file_space()
1753 * This routine allocates disk space for the given file.
1754 *
1755 * If alloc_type == 0, this request is for an ALLOCSP type
1756 * request which will change the file size. In this case, no
1757 * DMAPI event will be generated by the call. A TRUNCATE event
1758 * will be generated later by xfs_setattr.
1759 *
1760 * If alloc_type != 0, this request is for a RESVSP type
1761 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1762 * lower block boundary byte address is less than the file's
1763 * length.
1764 *
1765 * RETURNS:
1766 * 0 on success
1767 * errno on error
1768 *
1769 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001770STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771xfs_alloc_file_space(
1772 xfs_inode_t *ip,
1773 xfs_off_t offset,
1774 xfs_off_t len,
1775 int alloc_type,
1776 int attr_flags)
1777{
Nathan Scottdd9f4382006-01-11 15:28:28 +11001778 xfs_mount_t *mp = ip->i_mount;
1779 xfs_off_t count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 xfs_filblks_t allocated_fsb;
1781 xfs_filblks_t allocatesize_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +11001782 xfs_extlen_t extsz, temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 xfs_fileoff_t startoffset_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +11001784 xfs_fsblock_t firstfsb;
1785 int nimaps;
Nathan Scottdd9f4382006-01-11 15:28:28 +11001786 int quota_flag;
1787 int rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 xfs_trans_t *tp;
Nathan Scottdd9f4382006-01-11 15:28:28 +11001789 xfs_bmbt_irec_t imaps[1], *imapp;
1790 xfs_bmap_free_t free_list;
1791 uint qblocks, resblks, resrtextents;
1792 int committed;
1793 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
Christoph Hellwigcca28fb2010-06-24 11:57:09 +10001795 trace_xfs_alloc_file_space(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796
1797 if (XFS_FORCED_SHUTDOWN(mp))
1798 return XFS_ERROR(EIO);
1799
Christoph Hellwig7d095252009-06-08 15:33:32 +02001800 error = xfs_qm_dqattach(ip, 0);
1801 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 return error;
1803
1804 if (len <= 0)
1805 return XFS_ERROR(EINVAL);
1806
David Chinner957d0eb2007-06-18 16:50:37 +10001807 rt = XFS_IS_REALTIME_INODE(ip);
1808 extsz = xfs_get_extsz_hint(ip);
1809
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 count = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 imapp = &imaps[0];
Nathan Scottdd9f4382006-01-11 15:28:28 +11001812 nimaps = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
1814 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
1815
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11001817 * Allocate file space until done or until there is an error
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 while (allocatesize_fsb && !error) {
Nathan Scottdd9f4382006-01-11 15:28:28 +11001820 xfs_fileoff_t s, e;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821
Nathan Scottdd9f4382006-01-11 15:28:28 +11001822 /*
Nathan Scott3ddb8fa2006-01-11 15:33:02 +11001823 * Determine space reservations for data/realtime.
Nathan Scottdd9f4382006-01-11 15:28:28 +11001824 */
1825 if (unlikely(extsz)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 s = startoffset_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +11001827 do_div(s, extsz);
1828 s *= extsz;
1829 e = startoffset_fsb + allocatesize_fsb;
1830 if ((temp = do_mod(startoffset_fsb, extsz)))
1831 e += temp;
1832 if ((temp = do_mod(e, extsz)))
1833 e += extsz - temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 } else {
Nathan Scottdd9f4382006-01-11 15:28:28 +11001835 s = 0;
1836 e = allocatesize_fsb;
1837 }
1838
Dave Chinner72656c42010-09-03 12:19:33 +10001839 /*
1840 * The transaction reservation is limited to a 32-bit block
1841 * count, hence we need to limit the number of blocks we are
1842 * trying to reserve to avoid an overflow. We can't allocate
1843 * more than @nimaps extents, and an extent is limited on disk
1844 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1845 */
1846 resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
Nathan Scottdd9f4382006-01-11 15:28:28 +11001847 if (unlikely(rt)) {
Dave Chinner72656c42010-09-03 12:19:33 +10001848 resrtextents = qblocks = resblks;
Nathan Scottdd9f4382006-01-11 15:28:28 +11001849 resrtextents /= mp->m_sb.sb_rextsize;
1850 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
1851 quota_flag = XFS_QMOPT_RES_RTBLKS;
1852 } else {
1853 resrtextents = 0;
Dave Chinner72656c42010-09-03 12:19:33 +10001854 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
Nathan Scottdd9f4382006-01-11 15:28:28 +11001855 quota_flag = XFS_QMOPT_RES_REGBLKS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 }
1857
1858 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11001859 * Allocate and setup the transaction.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 */
1861 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
Nathan Scottdd9f4382006-01-11 15:28:28 +11001862 error = xfs_trans_reserve(tp, resblks,
1863 XFS_WRITE_LOG_RES(mp), resrtextents,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 XFS_TRANS_PERM_LOG_RES,
1865 XFS_WRITE_LOG_COUNT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11001867 * Check for running out of space
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 */
1869 if (error) {
1870 /*
1871 * Free the transaction structure.
1872 */
1873 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
1874 xfs_trans_cancel(tp, 0);
1875 break;
1876 }
1877 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwig7d095252009-06-08 15:33:32 +02001878 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
1879 0, quota_flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 if (error)
1881 goto error1;
1882
Christoph Hellwigddc34152011-09-19 15:00:54 +00001883 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884
Eric Sandeen9d87c312009-01-14 23:22:07 -06001885 xfs_bmap_init(&free_list, &firstfsb);
Dave Chinnerc0dc7822011-09-18 20:40:52 +00001886 error = xfs_bmapi_write(tp, ip, startoffset_fsb,
1887 allocatesize_fsb, alloc_type, &firstfsb,
1888 0, imapp, &nimaps, &free_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 if (error) {
1890 goto error0;
1891 }
1892
1893 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11001894 * Complete the transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001896 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 if (error) {
1898 goto error0;
1899 }
1900
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001901 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1903 if (error) {
1904 break;
1905 }
1906
1907 allocated_fsb = imapp->br_blockcount;
1908
Nathan Scottdd9f4382006-01-11 15:28:28 +11001909 if (nimaps == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 error = XFS_ERROR(ENOSPC);
1911 break;
1912 }
1913
1914 startoffset_fsb += allocated_fsb;
1915 allocatesize_fsb -= allocated_fsb;
1916 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917
1918 return error;
1919
Nathan Scottdd9f4382006-01-11 15:28:28 +11001920error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 xfs_bmap_cancel(&free_list);
Christoph Hellwig7d095252009-06-08 15:33:32 +02001922 xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
Nathan Scottdd9f4382006-01-11 15:28:28 +11001923
1924error1: /* Just cancel transaction */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1926 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Christoph Hellwig288699f2010-06-23 18:11:15 +10001927 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928}
1929
1930/*
1931 * Zero file bytes between startoff and endoff inclusive.
1932 * The iolock is held exclusive and no blocks are buffered.
Lachlan McIlroy2fd6f6e2008-09-17 16:52:50 +10001933 *
1934 * This function is used by xfs_free_file_space() to zero
1935 * partial blocks when the range to free is not block aligned.
1936 * When unreserving space with boundaries that are not block
1937 * aligned we round up the start and round down the end
1938 * boundaries and then use this function to zero the parts of
1939 * the blocks that got dropped during the rounding.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 */
1941STATIC int
1942xfs_zero_remaining_bytes(
1943 xfs_inode_t *ip,
1944 xfs_off_t startoff,
1945 xfs_off_t endoff)
1946{
1947 xfs_bmbt_irec_t imap;
1948 xfs_fileoff_t offset_fsb;
1949 xfs_off_t lastoffset;
1950 xfs_off_t offset;
1951 xfs_buf_t *bp;
1952 xfs_mount_t *mp = ip->i_mount;
1953 int nimap;
1954 int error = 0;
1955
Lachlan McIlroy2fd6f6e2008-09-17 16:52:50 +10001956 /*
1957 * Avoid doing I/O beyond eof - it's not necessary
1958 * since nothing can read beyond eof. The space will
1959 * be zeroed when the file is extended anyway.
1960 */
Christoph Hellwigce7ae1512011-12-18 20:00:11 +00001961 if (startoff >= XFS_ISIZE(ip))
Lachlan McIlroy2fd6f6e2008-09-17 16:52:50 +10001962 return 0;
1963
Christoph Hellwigce7ae1512011-12-18 20:00:11 +00001964 if (endoff > XFS_ISIZE(ip))
1965 endoff = XFS_ISIZE(ip);
Lachlan McIlroy2fd6f6e2008-09-17 16:52:50 +10001966
Dave Chinner686865f2010-09-24 20:07:47 +10001967 bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
1968 mp->m_rtdev_targp : mp->m_ddev_targp,
1969 mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
Lachlan McIlroyc6422612008-12-05 13:16:15 +11001970 if (!bp)
1971 return XFS_ERROR(ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972
Christoph Hellwigc8da0fa2011-07-08 14:36:25 +02001973 xfs_buf_unlock(bp);
1974
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
1976 offset_fsb = XFS_B_TO_FSBT(mp, offset);
1977 nimap = 1;
Dave Chinner5c8ed202011-09-18 20:40:45 +00001978 error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 if (error || nimap < 1)
1980 break;
1981 ASSERT(imap.br_blockcount >= 1);
1982 ASSERT(imap.br_startoff == offset_fsb);
1983 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
1984 if (lastoffset > endoff)
1985 lastoffset = endoff;
1986 if (imap.br_startblock == HOLESTARTBLOCK)
1987 continue;
1988 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1989 if (imap.br_state == XFS_EXT_UNWRITTEN)
1990 continue;
1991 XFS_BUF_UNDONE(bp);
1992 XFS_BUF_UNWRITE(bp);
1993 XFS_BUF_READ(bp);
Eric Sandeen9d87c312009-01-14 23:22:07 -06001994 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 xfsbdstrat(mp, bp);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +00001996 error = xfs_buf_iowait(bp);
David Chinnerd64e31a2008-04-10 12:22:17 +10001997 if (error) {
Christoph Hellwig901796a2011-10-10 16:52:49 +00001998 xfs_buf_ioerror_alert(bp,
1999 "xfs_zero_remaining_bytes(read)");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 break;
2001 }
Chandra Seetharaman62926042011-07-22 23:40:15 +00002002 memset(bp->b_addr +
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
2004 0, lastoffset - offset + 1);
2005 XFS_BUF_UNDONE(bp);
2006 XFS_BUF_UNREAD(bp);
2007 XFS_BUF_WRITE(bp);
2008 xfsbdstrat(mp, bp);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +00002009 error = xfs_buf_iowait(bp);
David Chinnerd64e31a2008-04-10 12:22:17 +10002010 if (error) {
Christoph Hellwig901796a2011-10-10 16:52:49 +00002011 xfs_buf_ioerror_alert(bp,
2012 "xfs_zero_remaining_bytes(write)");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013 break;
2014 }
2015 }
2016 xfs_buf_free(bp);
2017 return error;
2018}
2019
2020/*
2021 * xfs_free_file_space()
2022 * This routine frees disk space for the given file.
2023 *
2024 * This routine is only called by xfs_change_file_space
2025 * for an UNRESVSP type call.
2026 *
2027 * RETURNS:
2028 * 0 on success
2029 * errno on error
2030 *
2031 */
2032STATIC int
2033xfs_free_file_space(
2034 xfs_inode_t *ip,
2035 xfs_off_t offset,
2036 xfs_off_t len,
2037 int attr_flags)
2038{
2039 int committed;
2040 int done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 xfs_fileoff_t endoffset_fsb;
2042 int error;
2043 xfs_fsblock_t firstfsb;
2044 xfs_bmap_free_t free_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045 xfs_bmbt_irec_t imap;
2046 xfs_off_t ioffset;
2047 xfs_extlen_t mod=0;
2048 xfs_mount_t *mp;
2049 int nimap;
2050 uint resblks;
Nathan Scott673cdf52006-09-28 10:56:26 +10002051 uint rounding;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 int rt;
2053 xfs_fileoff_t startoffset_fsb;
2054 xfs_trans_t *tp;
Dean Roehrich5fcbab32005-05-05 13:27:19 -07002055 int need_iolock = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 mp = ip->i_mount;
2058
Christoph Hellwigcca28fb2010-06-24 11:57:09 +10002059 trace_xfs_free_file_space(ip);
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10002060
Christoph Hellwig7d095252009-06-08 15:33:32 +02002061 error = xfs_qm_dqattach(ip, 0);
2062 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 return error;
2064
2065 error = 0;
2066 if (len <= 0) /* if nothing being freed */
2067 return error;
Eric Sandeen71ddabb2007-11-23 16:29:42 +11002068 rt = XFS_IS_REALTIME_INODE(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
Christoph Hellwig288699f2010-06-23 18:11:15 +10002070 endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071
Christoph Hellwig0f285c82008-07-18 17:13:28 +10002072 if (attr_flags & XFS_ATTR_NOLOCK)
Dean Roehrich5fcbab32005-05-05 13:27:19 -07002073 need_iolock = 0;
Yingping Lu9fa80462006-03-22 12:44:35 +11002074 if (need_iolock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 xfs_ilock(ip, XFS_IOLOCK_EXCL);
Christoph Hellwig25e41b32008-12-03 12:20:39 +01002076 /* wait for the completion of any pending DIOs */
Christoph Hellwig4a06fd22011-08-23 08:28:13 +00002077 inode_dio_wait(VFS_I(ip));
Yingping Lu9fa80462006-03-22 12:44:35 +11002078 }
Dean Roehrich5fcbab32005-05-05 13:27:19 -07002079
Tim Shimmine6a4b372007-11-23 16:30:42 +11002080 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 ioffset = offset & ~(rounding - 1);
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10002082
Christoph Hellwigdf80c932008-08-13 16:22:09 +10002083 if (VN_CACHED(VFS_I(ip)) != 0) {
Tim Shimmine6a4b372007-11-23 16:30:42 +11002084 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10002085 if (error)
2086 goto out_unlock_iolock;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10002087 }
2088
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 /*
2090 * Need to zero the stuff we're not freeing, on disk.
Malcolm Parsons9da096f2009-03-29 09:55:42 +02002091 * If it's a realtime file & can't use unwritten extents then we
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2093 * will take care of it for us.
2094 */
Eric Sandeen62118702008-03-06 13:44:28 +11002095 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 nimap = 1;
Dave Chinner5c8ed202011-09-18 20:40:45 +00002097 error = xfs_bmapi_read(ip, startoffset_fsb, 1,
2098 &imap, &nimap, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 if (error)
2100 goto out_unlock_iolock;
2101 ASSERT(nimap == 0 || nimap == 1);
2102 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2103 xfs_daddr_t block;
2104
2105 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2106 block = imap.br_startblock;
2107 mod = do_div(block, mp->m_sb.sb_rextsize);
2108 if (mod)
2109 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
2110 }
2111 nimap = 1;
Dave Chinner5c8ed202011-09-18 20:40:45 +00002112 error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
2113 &imap, &nimap, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 if (error)
2115 goto out_unlock_iolock;
2116 ASSERT(nimap == 0 || nimap == 1);
2117 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2118 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2119 mod++;
2120 if (mod && (mod != mp->m_sb.sb_rextsize))
2121 endoffset_fsb -= mod;
2122 }
2123 }
2124 if ((done = (endoffset_fsb <= startoffset_fsb)))
2125 /*
2126 * One contiguous piece to clear
2127 */
2128 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
2129 else {
2130 /*
2131 * Some full blocks, possibly two pieces to clear
2132 */
2133 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
2134 error = xfs_zero_remaining_bytes(ip, offset,
2135 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
2136 if (!error &&
2137 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
2138 error = xfs_zero_remaining_bytes(ip,
2139 XFS_FSB_TO_B(mp, endoffset_fsb),
2140 offset + len - 1);
2141 }
2142
2143 /*
2144 * free file space until done or until there is an error
2145 */
2146 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2147 while (!error && !done) {
2148
2149 /*
David Chinner91ebecc2007-07-19 16:28:30 +10002150 * allocate and setup the transaction. Allow this
2151 * transaction to dip into the reserve blocks to ensure
2152 * the freeing of the space succeeds at ENOSPC.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 */
2154 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
David Chinner91ebecc2007-07-19 16:28:30 +10002155 tp->t_flags |= XFS_TRANS_RESERVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156 error = xfs_trans_reserve(tp,
2157 resblks,
2158 XFS_WRITE_LOG_RES(mp),
2159 0,
2160 XFS_TRANS_PERM_LOG_RES,
2161 XFS_WRITE_LOG_COUNT);
2162
2163 /*
2164 * check for running out of space
2165 */
2166 if (error) {
2167 /*
2168 * Free the transaction structure.
2169 */
2170 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2171 xfs_trans_cancel(tp, 0);
2172 break;
2173 }
2174 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwig7d095252009-06-08 15:33:32 +02002175 error = xfs_trans_reserve_quota(tp, mp,
2176 ip->i_udquot, ip->i_gdquot,
2177 resblks, 0, XFS_QMOPT_RES_REGBLKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178 if (error)
2179 goto error1;
2180
Christoph Hellwigddc34152011-09-19 15:00:54 +00002181 xfs_trans_ijoin(tp, ip, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182
2183 /*
2184 * issue the bunmapi() call to free the blocks
2185 */
Eric Sandeen9d87c312009-01-14 23:22:07 -06002186 xfs_bmap_init(&free_list, &firstfsb);
Lachlan McIlroy541d7d32007-10-11 17:34:33 +10002187 error = xfs_bunmapi(tp, ip, startoffset_fsb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188 endoffset_fsb - startoffset_fsb,
Christoph Hellwigb4e91812010-06-23 18:11:15 +10002189 0, 2, &firstfsb, &free_list, &done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190 if (error) {
2191 goto error0;
2192 }
2193
2194 /*
2195 * complete the transaction
2196 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +11002197 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198 if (error) {
2199 goto error0;
2200 }
2201
Eric Sandeen1c72bf92007-05-08 13:48:42 +10002202 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2204 }
2205
2206 out_unlock_iolock:
2207 if (need_iolock)
2208 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2209 return error;
2210
2211 error0:
2212 xfs_bmap_cancel(&free_list);
2213 error1:
2214 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2215 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
2216 XFS_ILOCK_EXCL);
2217 return error;
2218}
2219
2220/*
2221 * xfs_change_file_space()
2222 * This routine allocates or frees disk space for the given file.
2223 * The user specified parameters are checked for alignment and size
2224 * limitations.
2225 *
2226 * RETURNS:
2227 * 0 on success
2228 * errno on error
2229 *
2230 */
2231int
2232xfs_change_file_space(
Christoph Hellwig993386c2007-08-28 16:12:30 +10002233 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234 int cmd,
2235 xfs_flock64_t *bf,
2236 xfs_off_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 int attr_flags)
2238{
Christoph Hellwig993386c2007-08-28 16:12:30 +10002239 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 int clrprealloc;
2241 int error;
2242 xfs_fsize_t fsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243 int setprealloc;
2244 xfs_off_t startoffset;
2245 xfs_off_t llen;
2246 xfs_trans_t *tp;
Christoph Hellwig0f285c82008-07-18 17:13:28 +10002247 struct iattr iattr;
Dave Chinner44722352010-08-24 12:02:11 +10002248 int prealloc_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249
Christoph Hellwig993386c2007-08-28 16:12:30 +10002250 if (!S_ISREG(ip->i_d.di_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 return XFS_ERROR(EINVAL);
2252
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 switch (bf->l_whence) {
2254 case 0: /*SEEK_SET*/
2255 break;
2256 case 1: /*SEEK_CUR*/
2257 bf->l_start += offset;
2258 break;
2259 case 2: /*SEEK_END*/
Christoph Hellwigce7ae1512011-12-18 20:00:11 +00002260 bf->l_start += XFS_ISIZE(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261 break;
2262 default:
2263 return XFS_ERROR(EINVAL);
2264 }
2265
2266 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
2267
2268 if ( (bf->l_start < 0)
2269 || (bf->l_start > XFS_MAXIOFFSET(mp))
2270 || (bf->l_start + llen < 0)
2271 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
2272 return XFS_ERROR(EINVAL);
2273
2274 bf->l_whence = 0;
2275
2276 startoffset = bf->l_start;
Christoph Hellwigce7ae1512011-12-18 20:00:11 +00002277 fsize = XFS_ISIZE(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278
2279 /*
2280 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2281 * file space.
2282 * These calls do NOT zero the data space allocated to the file,
2283 * nor do they change the file size.
2284 *
2285 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2286 * space.
2287 * These calls cause the new file data to be zeroed and the file
2288 * size to be changed.
2289 */
2290 setprealloc = clrprealloc = 0;
Dave Chinner44722352010-08-24 12:02:11 +10002291 prealloc_type = XFS_BMAPI_PREALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292
2293 switch (cmd) {
Dave Chinner44722352010-08-24 12:02:11 +10002294 case XFS_IOC_ZERO_RANGE:
2295 prealloc_type |= XFS_BMAPI_CONVERT;
2296 xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
2297 /* FALLTHRU */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298 case XFS_IOC_RESVSP:
2299 case XFS_IOC_RESVSP64:
2300 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
Dave Chinner44722352010-08-24 12:02:11 +10002301 prealloc_type, attr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302 if (error)
2303 return error;
2304 setprealloc = 1;
2305 break;
2306
2307 case XFS_IOC_UNRESVSP:
2308 case XFS_IOC_UNRESVSP64:
2309 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
2310 attr_flags)))
2311 return error;
2312 break;
2313
2314 case XFS_IOC_ALLOCSP:
2315 case XFS_IOC_ALLOCSP64:
2316 case XFS_IOC_FREESP:
2317 case XFS_IOC_FREESP64:
2318 if (startoffset > fsize) {
2319 error = xfs_alloc_file_space(ip, fsize,
2320 startoffset - fsize, 0, attr_flags);
2321 if (error)
2322 break;
2323 }
2324
Christoph Hellwig0f285c82008-07-18 17:13:28 +10002325 iattr.ia_valid = ATTR_SIZE;
2326 iattr.ia_size = startoffset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327
Christoph Hellwigc4ed4242011-07-08 14:34:23 +02002328 error = xfs_setattr_size(ip, &iattr, attr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329
2330 if (error)
2331 return error;
2332
2333 clrprealloc = 1;
2334 break;
2335
2336 default:
2337 ASSERT(0);
2338 return XFS_ERROR(EINVAL);
2339 }
2340
2341 /*
2342 * update the inode timestamp, mode, and prealloc flag bits
2343 */
2344 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
2345
2346 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
2347 0, 0, 0))) {
2348 /* ASSERT(0); */
2349 xfs_trans_cancel(tp, 0);
2350 return error;
2351 }
2352
2353 xfs_ilock(ip, XFS_ILOCK_EXCL);
Christoph Hellwigddc34152011-09-19 15:00:54 +00002354 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355
Christoph Hellwig0f285c82008-07-18 17:13:28 +10002356 if ((attr_flags & XFS_ATTR_DMI) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 ip->i_d.di_mode &= ~S_ISUID;
2358
2359 /*
2360 * Note that we don't have to worry about mandatory
2361 * file locking being disabled here because we only
2362 * clear the S_ISGID bit if the Group execute bit is
2363 * on, but if it was on then mandatory locking wouldn't
2364 * have been enabled.
2365 */
2366 if (ip->i_d.di_mode & S_IXGRP)
2367 ip->i_d.di_mode &= ~S_ISGID;
2368
Dave Chinnerdcd79a12010-09-28 12:27:25 +10002369 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370 }
2371 if (setprealloc)
2372 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
2373 else if (clrprealloc)
2374 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
2375
2376 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
Dave Chinner82878892011-03-26 09:13:08 +11002377 if (attr_flags & XFS_ATTR_SYNC)
2378 xfs_trans_set_sync(tp);
Christoph Hellwig23bb0be2011-09-18 20:47:51 +00002379 return xfs_trans_commit(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380}