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Linux 3.17-rc2
[deliverable/linux.git] / fs / xfs / xfs_super.c
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1/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * 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.
13 *
14 * 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
17 */
18
19#include "xfs.h"
20#include "xfs_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_inum.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_mount.h"
28#include "xfs_da_format.h"
29#include "xfs_inode.h"
30#include "xfs_btree.h"
31#include "xfs_bmap.h"
32#include "xfs_alloc.h"
33#include "xfs_error.h"
34#include "xfs_fsops.h"
35#include "xfs_trans.h"
36#include "xfs_buf_item.h"
37#include "xfs_log.h"
38#include "xfs_log_priv.h"
39#include "xfs_da_btree.h"
40#include "xfs_dir2.h"
41#include "xfs_extfree_item.h"
42#include "xfs_mru_cache.h"
43#include "xfs_inode_item.h"
44#include "xfs_icache.h"
45#include "xfs_trace.h"
46#include "xfs_icreate_item.h"
47#include "xfs_dinode.h"
48#include "xfs_filestream.h"
49#include "xfs_quota.h"
50
51#include <linux/namei.h>
52#include <linux/init.h>
53#include <linux/slab.h>
54#include <linux/mount.h>
55#include <linux/mempool.h>
56#include <linux/writeback.h>
57#include <linux/kthread.h>
58#include <linux/freezer.h>
59#include <linux/parser.h>
60
61static const struct super_operations xfs_super_operations;
62static kmem_zone_t *xfs_ioend_zone;
63mempool_t *xfs_ioend_pool;
64struct kset *xfs_kset;
65
66#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
67#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
68#define MNTOPT_LOGDEV "logdev" /* log device */
69#define MNTOPT_RTDEV "rtdev" /* realtime I/O device */
70#define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */
71#define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */
72#define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */
73#define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */
74#define MNTOPT_SUNIT "sunit" /* data volume stripe unit */
75#define MNTOPT_SWIDTH "swidth" /* data volume stripe width */
76#define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */
77#define MNTOPT_MTPT "mtpt" /* filesystem mount point */
78#define MNTOPT_GRPID "grpid" /* group-ID from parent directory */
79#define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */
80#define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */
81#define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */
82#define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */
83#define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */
84#define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and
85 * unwritten extent conversion */
86#define MNTOPT_NOBARRIER "nobarrier" /* .. disable */
87#define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */
88#define MNTOPT_32BITINODE "inode32" /* inode allocation limited to
89 * XFS_MAXINUMBER_32 */
90#define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */
91#define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */
92#define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */
93#define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes
94 * in stat(). */
95#define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */
96#define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */
97#define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */
98#define MNTOPT_QUOTA "quota" /* disk quotas (user) */
99#define MNTOPT_NOQUOTA "noquota" /* no quotas */
100#define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */
101#define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */
102#define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */
103#define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */
104#define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */
105#define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */
106#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
107#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
108#define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
109#define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */
110#define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */
111#define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */
112#define MNTOPT_DISCARD "discard" /* Discard unused blocks */
113#define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */
114
115/*
116 * Table driven mount option parser.
117 *
118 * Currently only used for remount, but it will be used for mount
119 * in the future, too.
120 */
121enum {
122 Opt_barrier,
123 Opt_nobarrier,
124 Opt_inode64,
125 Opt_inode32,
126 Opt_err
127};
128
129static const match_table_t tokens = {
130 {Opt_barrier, "barrier"},
131 {Opt_nobarrier, "nobarrier"},
132 {Opt_inode64, "inode64"},
133 {Opt_inode32, "inode32"},
134 {Opt_err, NULL}
135};
136
137
138STATIC unsigned long
139suffix_kstrtoint(char *s, unsigned int base, int *res)
140{
141 int last, shift_left_factor = 0, _res;
142 char *value = s;
143
144 last = strlen(value) - 1;
145 if (value[last] == 'K' || value[last] == 'k') {
146 shift_left_factor = 10;
147 value[last] = '\0';
148 }
149 if (value[last] == 'M' || value[last] == 'm') {
150 shift_left_factor = 20;
151 value[last] = '\0';
152 }
153 if (value[last] == 'G' || value[last] == 'g') {
154 shift_left_factor = 30;
155 value[last] = '\0';
156 }
157
158 if (kstrtoint(s, base, &_res))
159 return -EINVAL;
160 *res = _res << shift_left_factor;
161 return 0;
162}
163
164/*
165 * This function fills in xfs_mount_t fields based on mount args.
166 * Note: the superblock has _not_ yet been read in.
167 *
168 * Note that this function leaks the various device name allocations on
169 * failure. The caller takes care of them.
170 */
171STATIC int
172xfs_parseargs(
173 struct xfs_mount *mp,
174 char *options)
175{
176 struct super_block *sb = mp->m_super;
177 char *this_char, *value;
178 int dsunit = 0;
179 int dswidth = 0;
180 int iosize = 0;
181 __uint8_t iosizelog = 0;
182
183 /*
184 * set up the mount name first so all the errors will refer to the
185 * correct device.
186 */
187 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
188 if (!mp->m_fsname)
189 return -ENOMEM;
190 mp->m_fsname_len = strlen(mp->m_fsname) + 1;
191
192 /*
193 * Copy binary VFS mount flags we are interested in.
194 */
195 if (sb->s_flags & MS_RDONLY)
196 mp->m_flags |= XFS_MOUNT_RDONLY;
197 if (sb->s_flags & MS_DIRSYNC)
198 mp->m_flags |= XFS_MOUNT_DIRSYNC;
199 if (sb->s_flags & MS_SYNCHRONOUS)
200 mp->m_flags |= XFS_MOUNT_WSYNC;
201
202 /*
203 * Set some default flags that could be cleared by the mount option
204 * parsing.
205 */
206 mp->m_flags |= XFS_MOUNT_BARRIER;
207 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
208
209 /*
210 * These can be overridden by the mount option parsing.
211 */
212 mp->m_logbufs = -1;
213 mp->m_logbsize = -1;
214
215 if (!options)
216 goto done;
217
218 while ((this_char = strsep(&options, ",")) != NULL) {
219 if (!*this_char)
220 continue;
221 if ((value = strchr(this_char, '=')) != NULL)
222 *value++ = 0;
223
224 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
225 if (!value || !*value) {
226 xfs_warn(mp, "%s option requires an argument",
227 this_char);
228 return -EINVAL;
229 }
230 if (kstrtoint(value, 10, &mp->m_logbufs))
231 return -EINVAL;
232 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
233 if (!value || !*value) {
234 xfs_warn(mp, "%s option requires an argument",
235 this_char);
236 return -EINVAL;
237 }
238 if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
239 return -EINVAL;
240 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
241 if (!value || !*value) {
242 xfs_warn(mp, "%s option requires an argument",
243 this_char);
244 return -EINVAL;
245 }
246 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
247 if (!mp->m_logname)
248 return -ENOMEM;
249 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
250 xfs_warn(mp, "%s option not allowed on this system",
251 this_char);
252 return -EINVAL;
253 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
254 if (!value || !*value) {
255 xfs_warn(mp, "%s option requires an argument",
256 this_char);
257 return -EINVAL;
258 }
259 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
260 if (!mp->m_rtname)
261 return -ENOMEM;
262 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
263 if (!value || !*value) {
264 xfs_warn(mp, "%s option requires an argument",
265 this_char);
266 return -EINVAL;
267 }
268 if (kstrtoint(value, 10, &iosize))
269 return -EINVAL;
270 iosizelog = ffs(iosize) - 1;
271 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
272 if (!value || !*value) {
273 xfs_warn(mp, "%s option requires an argument",
274 this_char);
275 return -EINVAL;
276 }
277 if (suffix_kstrtoint(value, 10, &iosize))
278 return -EINVAL;
279 iosizelog = ffs(iosize) - 1;
280 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
281 !strcmp(this_char, MNTOPT_BSDGROUPS)) {
282 mp->m_flags |= XFS_MOUNT_GRPID;
283 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
284 !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
285 mp->m_flags &= ~XFS_MOUNT_GRPID;
286 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
287 mp->m_flags |= XFS_MOUNT_WSYNC;
288 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
289 mp->m_flags |= XFS_MOUNT_NORECOVERY;
290 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
291 mp->m_flags |= XFS_MOUNT_NOALIGN;
292 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
293 mp->m_flags |= XFS_MOUNT_SWALLOC;
294 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
295 if (!value || !*value) {
296 xfs_warn(mp, "%s option requires an argument",
297 this_char);
298 return -EINVAL;
299 }
300 if (kstrtoint(value, 10, &dsunit))
301 return -EINVAL;
302 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
303 if (!value || !*value) {
304 xfs_warn(mp, "%s option requires an argument",
305 this_char);
306 return -EINVAL;
307 }
308 if (kstrtoint(value, 10, &dswidth))
309 return -EINVAL;
310 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
311 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
312 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
313 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
314 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
315 mp->m_flags |= XFS_MOUNT_NOUUID;
316 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
317 mp->m_flags |= XFS_MOUNT_BARRIER;
318 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
319 mp->m_flags &= ~XFS_MOUNT_BARRIER;
320 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
321 mp->m_flags |= XFS_MOUNT_IKEEP;
322 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
323 mp->m_flags &= ~XFS_MOUNT_IKEEP;
324 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
325 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
326 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
327 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
328 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
329 mp->m_flags |= XFS_MOUNT_ATTR2;
330 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
331 mp->m_flags &= ~XFS_MOUNT_ATTR2;
332 mp->m_flags |= XFS_MOUNT_NOATTR2;
333 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
334 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
335 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
336 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
337 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
338 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
339 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
340 !strcmp(this_char, MNTOPT_UQUOTA) ||
341 !strcmp(this_char, MNTOPT_USRQUOTA)) {
342 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
343 XFS_UQUOTA_ENFD);
344 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
345 !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
346 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
347 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
348 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
349 !strcmp(this_char, MNTOPT_PRJQUOTA)) {
350 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
351 XFS_PQUOTA_ENFD);
352 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
353 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
354 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
355 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
356 !strcmp(this_char, MNTOPT_GRPQUOTA)) {
357 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
358 XFS_GQUOTA_ENFD);
359 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
360 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
361 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
362 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
363 xfs_warn(mp,
364 "delaylog is the default now, option is deprecated.");
365 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
366 xfs_warn(mp,
367 "nodelaylog support has been removed, option is deprecated.");
368 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
369 mp->m_flags |= XFS_MOUNT_DISCARD;
370 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
371 mp->m_flags &= ~XFS_MOUNT_DISCARD;
372 } else if (!strcmp(this_char, "ihashsize")) {
373 xfs_warn(mp,
374 "ihashsize no longer used, option is deprecated.");
375 } else if (!strcmp(this_char, "osyncisdsync")) {
376 xfs_warn(mp,
377 "osyncisdsync has no effect, option is deprecated.");
378 } else if (!strcmp(this_char, "osyncisosync")) {
379 xfs_warn(mp,
380 "osyncisosync has no effect, option is deprecated.");
381 } else if (!strcmp(this_char, "irixsgid")) {
382 xfs_warn(mp,
383 "irixsgid is now a sysctl(2) variable, option is deprecated.");
384 } else {
385 xfs_warn(mp, "unknown mount option [%s].", this_char);
386 return -EINVAL;
387 }
388 }
389
390 /*
391 * no recovery flag requires a read-only mount
392 */
393 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
394 !(mp->m_flags & XFS_MOUNT_RDONLY)) {
395 xfs_warn(mp, "no-recovery mounts must be read-only.");
396 return -EINVAL;
397 }
398
399 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
400 xfs_warn(mp,
401 "sunit and swidth options incompatible with the noalign option");
402 return -EINVAL;
403 }
404
405#ifndef CONFIG_XFS_QUOTA
406 if (XFS_IS_QUOTA_RUNNING(mp)) {
407 xfs_warn(mp, "quota support not available in this kernel.");
408 return -EINVAL;
409 }
410#endif
411
412 if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
413 xfs_warn(mp, "sunit and swidth must be specified together");
414 return -EINVAL;
415 }
416
417 if (dsunit && (dswidth % dsunit != 0)) {
418 xfs_warn(mp,
419 "stripe width (%d) must be a multiple of the stripe unit (%d)",
420 dswidth, dsunit);
421 return -EINVAL;
422 }
423
424done:
425 if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
426 /*
427 * At this point the superblock has not been read
428 * in, therefore we do not know the block size.
429 * Before the mount call ends we will convert
430 * these to FSBs.
431 */
432 mp->m_dalign = dsunit;
433 mp->m_swidth = dswidth;
434 }
435
436 if (mp->m_logbufs != -1 &&
437 mp->m_logbufs != 0 &&
438 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
439 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
440 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
441 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
442 return -EINVAL;
443 }
444 if (mp->m_logbsize != -1 &&
445 mp->m_logbsize != 0 &&
446 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
447 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
448 !is_power_of_2(mp->m_logbsize))) {
449 xfs_warn(mp,
450 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
451 mp->m_logbsize);
452 return -EINVAL;
453 }
454
455 if (iosizelog) {
456 if (iosizelog > XFS_MAX_IO_LOG ||
457 iosizelog < XFS_MIN_IO_LOG) {
458 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
459 iosizelog, XFS_MIN_IO_LOG,
460 XFS_MAX_IO_LOG);
461 return -EINVAL;
462 }
463
464 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
465 mp->m_readio_log = iosizelog;
466 mp->m_writeio_log = iosizelog;
467 }
468
469 return 0;
470}
471
472struct proc_xfs_info {
473 int flag;
474 char *str;
475};
476
477STATIC int
478xfs_showargs(
479 struct xfs_mount *mp,
480 struct seq_file *m)
481{
482 static struct proc_xfs_info xfs_info_set[] = {
483 /* the few simple ones we can get from the mount struct */
484 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP },
485 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC },
486 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN },
487 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC },
488 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID },
489 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY },
490 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 },
491 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
492 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
493 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD },
494 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_32BITINODE },
495 { 0, NULL }
496 };
497 static struct proc_xfs_info xfs_info_unset[] = {
498 /* the few simple ones we can get from the mount struct */
499 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO },
500 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER },
501 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE },
502 { 0, NULL }
503 };
504 struct proc_xfs_info *xfs_infop;
505
506 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
507 if (mp->m_flags & xfs_infop->flag)
508 seq_puts(m, xfs_infop->str);
509 }
510 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
511 if (!(mp->m_flags & xfs_infop->flag))
512 seq_puts(m, xfs_infop->str);
513 }
514
515 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
516 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
517 (int)(1 << mp->m_writeio_log) >> 10);
518
519 if (mp->m_logbufs > 0)
520 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
521 if (mp->m_logbsize > 0)
522 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
523
524 if (mp->m_logname)
525 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
526 if (mp->m_rtname)
527 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
528
529 if (mp->m_dalign > 0)
530 seq_printf(m, "," MNTOPT_SUNIT "=%d",
531 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
532 if (mp->m_swidth > 0)
533 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
534 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
535
536 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
537 seq_puts(m, "," MNTOPT_USRQUOTA);
538 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
539 seq_puts(m, "," MNTOPT_UQUOTANOENF);
540
541 if (mp->m_qflags & XFS_PQUOTA_ACCT) {
542 if (mp->m_qflags & XFS_PQUOTA_ENFD)
543 seq_puts(m, "," MNTOPT_PRJQUOTA);
544 else
545 seq_puts(m, "," MNTOPT_PQUOTANOENF);
546 }
547 if (mp->m_qflags & XFS_GQUOTA_ACCT) {
548 if (mp->m_qflags & XFS_GQUOTA_ENFD)
549 seq_puts(m, "," MNTOPT_GRPQUOTA);
550 else
551 seq_puts(m, "," MNTOPT_GQUOTANOENF);
552 }
553
554 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
555 seq_puts(m, "," MNTOPT_NOQUOTA);
556
557 return 0;
558}
559__uint64_t
560xfs_max_file_offset(
561 unsigned int blockshift)
562{
563 unsigned int pagefactor = 1;
564 unsigned int bitshift = BITS_PER_LONG - 1;
565
566 /* Figure out maximum filesize, on Linux this can depend on
567 * the filesystem blocksize (on 32 bit platforms).
568 * __block_write_begin does this in an [unsigned] long...
569 * page->index << (PAGE_CACHE_SHIFT - bbits)
570 * So, for page sized blocks (4K on 32 bit platforms),
571 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
572 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
573 * but for smaller blocksizes it is less (bbits = log2 bsize).
574 * Note1: get_block_t takes a long (implicit cast from above)
575 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
576 * can optionally convert the [unsigned] long from above into
577 * an [unsigned] long long.
578 */
579
580#if BITS_PER_LONG == 32
581# if defined(CONFIG_LBDAF)
582 ASSERT(sizeof(sector_t) == 8);
583 pagefactor = PAGE_CACHE_SIZE;
584 bitshift = BITS_PER_LONG;
585# else
586 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
587# endif
588#endif
589
590 return (((__uint64_t)pagefactor) << bitshift) - 1;
591}
592
593/*
594 * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
595 * because in the growfs case, mp->m_sb.sb_agcount is not updated
596 * yet to the potentially higher ag count.
597 */
598xfs_agnumber_t
599xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
600{
601 xfs_agnumber_t index = 0;
602 xfs_agnumber_t maxagi = 0;
603 xfs_sb_t *sbp = &mp->m_sb;
604 xfs_agnumber_t max_metadata;
605 xfs_agino_t agino;
606 xfs_ino_t ino;
607 xfs_perag_t *pag;
608
609 /* Calculate how much should be reserved for inodes to meet
610 * the max inode percentage.
611 */
612 if (mp->m_maxicount) {
613 __uint64_t icount;
614
615 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
616 do_div(icount, 100);
617 icount += sbp->sb_agblocks - 1;
618 do_div(icount, sbp->sb_agblocks);
619 max_metadata = icount;
620 } else {
621 max_metadata = agcount;
622 }
623
624 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
625
626 for (index = 0; index < agcount; index++) {
627 ino = XFS_AGINO_TO_INO(mp, index, agino);
628
629 if (ino > XFS_MAXINUMBER_32) {
630 pag = xfs_perag_get(mp, index);
631 pag->pagi_inodeok = 0;
632 pag->pagf_metadata = 0;
633 xfs_perag_put(pag);
634 continue;
635 }
636
637 pag = xfs_perag_get(mp, index);
638 pag->pagi_inodeok = 1;
639 maxagi++;
640 if (index < max_metadata)
641 pag->pagf_metadata = 1;
642 xfs_perag_put(pag);
643 }
644 mp->m_flags |= (XFS_MOUNT_32BITINODES |
645 XFS_MOUNT_SMALL_INUMS);
646
647 return maxagi;
648}
649
650xfs_agnumber_t
651xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount)
652{
653 xfs_agnumber_t index = 0;
654
655 for (index = 0; index < agcount; index++) {
656 struct xfs_perag *pag;
657
658 pag = xfs_perag_get(mp, index);
659 pag->pagi_inodeok = 1;
660 pag->pagf_metadata = 0;
661 xfs_perag_put(pag);
662 }
663
664 /* There is no need for lock protection on m_flags,
665 * the rw_semaphore of the VFS superblock is locked
666 * during mount/umount/remount operations, so this is
667 * enough to avoid concurency on the m_flags field
668 */
669 mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
670 XFS_MOUNT_SMALL_INUMS);
671 return index;
672}
673
674STATIC int
675xfs_blkdev_get(
676 xfs_mount_t *mp,
677 const char *name,
678 struct block_device **bdevp)
679{
680 int error = 0;
681
682 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
683 mp);
684 if (IS_ERR(*bdevp)) {
685 error = PTR_ERR(*bdevp);
686 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
687 }
688
689 return error;
690}
691
692STATIC void
693xfs_blkdev_put(
694 struct block_device *bdev)
695{
696 if (bdev)
697 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
698}
699
700void
701xfs_blkdev_issue_flush(
702 xfs_buftarg_t *buftarg)
703{
704 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
705}
706
707STATIC void
708xfs_close_devices(
709 struct xfs_mount *mp)
710{
711 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
712 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
713 xfs_free_buftarg(mp, mp->m_logdev_targp);
714 xfs_blkdev_put(logdev);
715 }
716 if (mp->m_rtdev_targp) {
717 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
718 xfs_free_buftarg(mp, mp->m_rtdev_targp);
719 xfs_blkdev_put(rtdev);
720 }
721 xfs_free_buftarg(mp, mp->m_ddev_targp);
722}
723
724/*
725 * The file system configurations are:
726 * (1) device (partition) with data and internal log
727 * (2) logical volume with data and log subvolumes.
728 * (3) logical volume with data, log, and realtime subvolumes.
729 *
730 * We only have to handle opening the log and realtime volumes here if
731 * they are present. The data subvolume has already been opened by
732 * get_sb_bdev() and is stored in sb->s_bdev.
733 */
734STATIC int
735xfs_open_devices(
736 struct xfs_mount *mp)
737{
738 struct block_device *ddev = mp->m_super->s_bdev;
739 struct block_device *logdev = NULL, *rtdev = NULL;
740 int error;
741
742 /*
743 * Open real time and log devices - order is important.
744 */
745 if (mp->m_logname) {
746 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
747 if (error)
748 goto out;
749 }
750
751 if (mp->m_rtname) {
752 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
753 if (error)
754 goto out_close_logdev;
755
756 if (rtdev == ddev || rtdev == logdev) {
757 xfs_warn(mp,
758 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
759 error = -EINVAL;
760 goto out_close_rtdev;
761 }
762 }
763
764 /*
765 * Setup xfs_mount buffer target pointers
766 */
767 error = -ENOMEM;
768 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
769 if (!mp->m_ddev_targp)
770 goto out_close_rtdev;
771
772 if (rtdev) {
773 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
774 if (!mp->m_rtdev_targp)
775 goto out_free_ddev_targ;
776 }
777
778 if (logdev && logdev != ddev) {
779 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
780 if (!mp->m_logdev_targp)
781 goto out_free_rtdev_targ;
782 } else {
783 mp->m_logdev_targp = mp->m_ddev_targp;
784 }
785
786 return 0;
787
788 out_free_rtdev_targ:
789 if (mp->m_rtdev_targp)
790 xfs_free_buftarg(mp, mp->m_rtdev_targp);
791 out_free_ddev_targ:
792 xfs_free_buftarg(mp, mp->m_ddev_targp);
793 out_close_rtdev:
794 if (rtdev)
795 xfs_blkdev_put(rtdev);
796 out_close_logdev:
797 if (logdev && logdev != ddev)
798 xfs_blkdev_put(logdev);
799 out:
800 return error;
801}
802
803/*
804 * Setup xfs_mount buffer target pointers based on superblock
805 */
806STATIC int
807xfs_setup_devices(
808 struct xfs_mount *mp)
809{
810 int error;
811
812 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
813 if (error)
814 return error;
815
816 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
817 unsigned int log_sector_size = BBSIZE;
818
819 if (xfs_sb_version_hassector(&mp->m_sb))
820 log_sector_size = mp->m_sb.sb_logsectsize;
821 error = xfs_setsize_buftarg(mp->m_logdev_targp,
822 log_sector_size);
823 if (error)
824 return error;
825 }
826 if (mp->m_rtdev_targp) {
827 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
828 mp->m_sb.sb_sectsize);
829 if (error)
830 return error;
831 }
832
833 return 0;
834}
835
836STATIC int
837xfs_init_mount_workqueues(
838 struct xfs_mount *mp)
839{
840 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
841 WQ_MEM_RECLAIM, 0, mp->m_fsname);
842 if (!mp->m_data_workqueue)
843 goto out;
844
845 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
846 WQ_MEM_RECLAIM, 0, mp->m_fsname);
847 if (!mp->m_unwritten_workqueue)
848 goto out_destroy_data_iodone_queue;
849
850 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
851 WQ_MEM_RECLAIM, 0, mp->m_fsname);
852 if (!mp->m_cil_workqueue)
853 goto out_destroy_unwritten;
854
855 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
856 0, 0, mp->m_fsname);
857 if (!mp->m_reclaim_workqueue)
858 goto out_destroy_cil;
859
860 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
861 0, 0, mp->m_fsname);
862 if (!mp->m_log_workqueue)
863 goto out_destroy_reclaim;
864
865 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
866 0, 0, mp->m_fsname);
867 if (!mp->m_eofblocks_workqueue)
868 goto out_destroy_log;
869
870 return 0;
871
872out_destroy_log:
873 destroy_workqueue(mp->m_log_workqueue);
874out_destroy_reclaim:
875 destroy_workqueue(mp->m_reclaim_workqueue);
876out_destroy_cil:
877 destroy_workqueue(mp->m_cil_workqueue);
878out_destroy_unwritten:
879 destroy_workqueue(mp->m_unwritten_workqueue);
880out_destroy_data_iodone_queue:
881 destroy_workqueue(mp->m_data_workqueue);
882out:
883 return -ENOMEM;
884}
885
886STATIC void
887xfs_destroy_mount_workqueues(
888 struct xfs_mount *mp)
889{
890 destroy_workqueue(mp->m_eofblocks_workqueue);
891 destroy_workqueue(mp->m_log_workqueue);
892 destroy_workqueue(mp->m_reclaim_workqueue);
893 destroy_workqueue(mp->m_cil_workqueue);
894 destroy_workqueue(mp->m_data_workqueue);
895 destroy_workqueue(mp->m_unwritten_workqueue);
896}
897
898/*
899 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
900 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
901 * for IO to complete so that we effectively throttle multiple callers to the
902 * rate at which IO is completing.
903 */
904void
905xfs_flush_inodes(
906 struct xfs_mount *mp)
907{
908 struct super_block *sb = mp->m_super;
909
910 if (down_read_trylock(&sb->s_umount)) {
911 sync_inodes_sb(sb);
912 up_read(&sb->s_umount);
913 }
914}
915
916/* Catch misguided souls that try to use this interface on XFS */
917STATIC struct inode *
918xfs_fs_alloc_inode(
919 struct super_block *sb)
920{
921 BUG();
922 return NULL;
923}
924
925/*
926 * Now that the generic code is guaranteed not to be accessing
927 * the linux inode, we can reclaim the inode.
928 */
929STATIC void
930xfs_fs_destroy_inode(
931 struct inode *inode)
932{
933 struct xfs_inode *ip = XFS_I(inode);
934
935 trace_xfs_destroy_inode(ip);
936
937 XFS_STATS_INC(vn_reclaim);
938
939 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
940
941 /*
942 * We should never get here with one of the reclaim flags already set.
943 */
944 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
945 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
946
947 /*
948 * We always use background reclaim here because even if the
949 * inode is clean, it still may be under IO and hence we have
950 * to take the flush lock. The background reclaim path handles
951 * this more efficiently than we can here, so simply let background
952 * reclaim tear down all inodes.
953 */
954 xfs_inode_set_reclaim_tag(ip);
955}
956
957/*
958 * Slab object creation initialisation for the XFS inode.
959 * This covers only the idempotent fields in the XFS inode;
960 * all other fields need to be initialised on allocation
961 * from the slab. This avoids the need to repeatedly initialise
962 * fields in the xfs inode that left in the initialise state
963 * when freeing the inode.
964 */
965STATIC void
966xfs_fs_inode_init_once(
967 void *inode)
968{
969 struct xfs_inode *ip = inode;
970
971 memset(ip, 0, sizeof(struct xfs_inode));
972
973 /* vfs inode */
974 inode_init_once(VFS_I(ip));
975
976 /* xfs inode */
977 atomic_set(&ip->i_pincount, 0);
978 spin_lock_init(&ip->i_flags_lock);
979
980 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
981 "xfsino", ip->i_ino);
982}
983
984STATIC void
985xfs_fs_evict_inode(
986 struct inode *inode)
987{
988 xfs_inode_t *ip = XFS_I(inode);
989
990 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
991
992 trace_xfs_evict_inode(ip);
993
994 truncate_inode_pages_final(&inode->i_data);
995 clear_inode(inode);
996 XFS_STATS_INC(vn_rele);
997 XFS_STATS_INC(vn_remove);
998 XFS_STATS_DEC(vn_active);
999
1000 xfs_inactive(ip);
1001}
1002
1003/*
1004 * We do an unlocked check for XFS_IDONTCACHE here because we are already
1005 * serialised against cache hits here via the inode->i_lock and igrab() in
1006 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1007 * racing with us, and it avoids needing to grab a spinlock here for every inode
1008 * we drop the final reference on.
1009 */
1010STATIC int
1011xfs_fs_drop_inode(
1012 struct inode *inode)
1013{
1014 struct xfs_inode *ip = XFS_I(inode);
1015
1016 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1017}
1018
1019STATIC void
1020xfs_free_fsname(
1021 struct xfs_mount *mp)
1022{
1023 kfree(mp->m_fsname);
1024 kfree(mp->m_rtname);
1025 kfree(mp->m_logname);
1026}
1027
1028STATIC void
1029xfs_fs_put_super(
1030 struct super_block *sb)
1031{
1032 struct xfs_mount *mp = XFS_M(sb);
1033
1034 xfs_filestream_unmount(mp);
1035 xfs_unmountfs(mp);
1036
1037 xfs_freesb(mp);
1038 xfs_icsb_destroy_counters(mp);
1039 xfs_destroy_mount_workqueues(mp);
1040 xfs_close_devices(mp);
1041 xfs_free_fsname(mp);
1042 kfree(mp);
1043}
1044
1045STATIC int
1046xfs_fs_sync_fs(
1047 struct super_block *sb,
1048 int wait)
1049{
1050 struct xfs_mount *mp = XFS_M(sb);
1051
1052 /*
1053 * Doing anything during the async pass would be counterproductive.
1054 */
1055 if (!wait)
1056 return 0;
1057
1058 xfs_log_force(mp, XFS_LOG_SYNC);
1059 if (laptop_mode) {
1060 /*
1061 * The disk must be active because we're syncing.
1062 * We schedule log work now (now that the disk is
1063 * active) instead of later (when it might not be).
1064 */
1065 flush_delayed_work(&mp->m_log->l_work);
1066 }
1067
1068 return 0;
1069}
1070
1071STATIC int
1072xfs_fs_statfs(
1073 struct dentry *dentry,
1074 struct kstatfs *statp)
1075{
1076 struct xfs_mount *mp = XFS_M(dentry->d_sb);
1077 xfs_sb_t *sbp = &mp->m_sb;
1078 struct xfs_inode *ip = XFS_I(dentry->d_inode);
1079 __uint64_t fakeinos, id;
1080 xfs_extlen_t lsize;
1081 __int64_t ffree;
1082
1083 statp->f_type = XFS_SB_MAGIC;
1084 statp->f_namelen = MAXNAMELEN - 1;
1085
1086 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1087 statp->f_fsid.val[0] = (u32)id;
1088 statp->f_fsid.val[1] = (u32)(id >> 32);
1089
1090 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1091
1092 spin_lock(&mp->m_sb_lock);
1093 statp->f_bsize = sbp->sb_blocksize;
1094 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1095 statp->f_blocks = sbp->sb_dblocks - lsize;
1096 statp->f_bfree = statp->f_bavail =
1097 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1098 fakeinos = statp->f_bfree << sbp->sb_inopblog;
1099 statp->f_files =
1100 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1101 if (mp->m_maxicount)
1102 statp->f_files = min_t(typeof(statp->f_files),
1103 statp->f_files,
1104 mp->m_maxicount);
1105
1106 /* make sure statp->f_ffree does not underflow */
1107 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1108 statp->f_ffree = max_t(__int64_t, ffree, 0);
1109
1110 spin_unlock(&mp->m_sb_lock);
1111
1112 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1113 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1114 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1115 xfs_qm_statvfs(ip, statp);
1116 return 0;
1117}
1118
1119STATIC void
1120xfs_save_resvblks(struct xfs_mount *mp)
1121{
1122 __uint64_t resblks = 0;
1123
1124 mp->m_resblks_save = mp->m_resblks;
1125 xfs_reserve_blocks(mp, &resblks, NULL);
1126}
1127
1128STATIC void
1129xfs_restore_resvblks(struct xfs_mount *mp)
1130{
1131 __uint64_t resblks;
1132
1133 if (mp->m_resblks_save) {
1134 resblks = mp->m_resblks_save;
1135 mp->m_resblks_save = 0;
1136 } else
1137 resblks = xfs_default_resblks(mp);
1138
1139 xfs_reserve_blocks(mp, &resblks, NULL);
1140}
1141
1142/*
1143 * Trigger writeback of all the dirty metadata in the file system.
1144 *
1145 * This ensures that the metadata is written to their location on disk rather
1146 * than just existing in transactions in the log. This means after a quiesce
1147 * there is no log replay required to write the inodes to disk - this is the
1148 * primary difference between a sync and a quiesce.
1149 *
1150 * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1151 * it is started again when appropriate.
1152 */
1153static void
1154xfs_quiesce_attr(
1155 struct xfs_mount *mp)
1156{
1157 int error = 0;
1158
1159 /* wait for all modifications to complete */
1160 while (atomic_read(&mp->m_active_trans) > 0)
1161 delay(100);
1162
1163 /* force the log to unpin objects from the now complete transactions */
1164 xfs_log_force(mp, XFS_LOG_SYNC);
1165
1166 /* reclaim inodes to do any IO before the freeze completes */
1167 xfs_reclaim_inodes(mp, 0);
1168 xfs_reclaim_inodes(mp, SYNC_WAIT);
1169
1170 /* Push the superblock and write an unmount record */
1171 error = xfs_log_sbcount(mp);
1172 if (error)
1173 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1174 "Frozen image may not be consistent.");
1175 /*
1176 * Just warn here till VFS can correctly support
1177 * read-only remount without racing.
1178 */
1179 WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1180
1181 xfs_log_quiesce(mp);
1182}
1183
1184STATIC int
1185xfs_fs_remount(
1186 struct super_block *sb,
1187 int *flags,
1188 char *options)
1189{
1190 struct xfs_mount *mp = XFS_M(sb);
1191 xfs_sb_t *sbp = &mp->m_sb;
1192 substring_t args[MAX_OPT_ARGS];
1193 char *p;
1194 int error;
1195
1196 sync_filesystem(sb);
1197 while ((p = strsep(&options, ",")) != NULL) {
1198 int token;
1199
1200 if (!*p)
1201 continue;
1202
1203 token = match_token(p, tokens, args);
1204 switch (token) {
1205 case Opt_barrier:
1206 mp->m_flags |= XFS_MOUNT_BARRIER;
1207 break;
1208 case Opt_nobarrier:
1209 mp->m_flags &= ~XFS_MOUNT_BARRIER;
1210 break;
1211 case Opt_inode64:
1212 mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1213 break;
1214 case Opt_inode32:
1215 mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1216 break;
1217 default:
1218 /*
1219 * Logically we would return an error here to prevent
1220 * users from believing they might have changed
1221 * mount options using remount which can't be changed.
1222 *
1223 * But unfortunately mount(8) adds all options from
1224 * mtab and fstab to the mount arguments in some cases
1225 * so we can't blindly reject options, but have to
1226 * check for each specified option if it actually
1227 * differs from the currently set option and only
1228 * reject it if that's the case.
1229 *
1230 * Until that is implemented we return success for
1231 * every remount request, and silently ignore all
1232 * options that we can't actually change.
1233 */
1234#if 0
1235 xfs_info(mp,
1236 "mount option \"%s\" not supported for remount", p);
1237 return -EINVAL;
1238#else
1239 break;
1240#endif
1241 }
1242 }
1243
1244 /* ro -> rw */
1245 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1246 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1247
1248 /*
1249 * If this is the first remount to writeable state we
1250 * might have some superblock changes to update.
1251 */
1252 if (mp->m_update_flags) {
1253 error = xfs_mount_log_sb(mp, mp->m_update_flags);
1254 if (error) {
1255 xfs_warn(mp, "failed to write sb changes");
1256 return error;
1257 }
1258 mp->m_update_flags = 0;
1259 }
1260
1261 /*
1262 * Fill out the reserve pool if it is empty. Use the stashed
1263 * value if it is non-zero, otherwise go with the default.
1264 */
1265 xfs_restore_resvblks(mp);
1266 xfs_log_work_queue(mp);
1267 }
1268
1269 /* rw -> ro */
1270 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1271 /*
1272 * Before we sync the metadata, we need to free up the reserve
1273 * block pool so that the used block count in the superblock on
1274 * disk is correct at the end of the remount. Stash the current
1275 * reserve pool size so that if we get remounted rw, we can
1276 * return it to the same size.
1277 */
1278 xfs_save_resvblks(mp);
1279 xfs_quiesce_attr(mp);
1280 mp->m_flags |= XFS_MOUNT_RDONLY;
1281 }
1282
1283 return 0;
1284}
1285
1286/*
1287 * Second stage of a freeze. The data is already frozen so we only
1288 * need to take care of the metadata. Once that's done write a dummy
1289 * record to dirty the log in case of a crash while frozen.
1290 */
1291STATIC int
1292xfs_fs_freeze(
1293 struct super_block *sb)
1294{
1295 struct xfs_mount *mp = XFS_M(sb);
1296
1297 xfs_save_resvblks(mp);
1298 xfs_quiesce_attr(mp);
1299 return xfs_fs_log_dummy(mp);
1300}
1301
1302STATIC int
1303xfs_fs_unfreeze(
1304 struct super_block *sb)
1305{
1306 struct xfs_mount *mp = XFS_M(sb);
1307
1308 xfs_restore_resvblks(mp);
1309 xfs_log_work_queue(mp);
1310 return 0;
1311}
1312
1313STATIC int
1314xfs_fs_show_options(
1315 struct seq_file *m,
1316 struct dentry *root)
1317{
1318 return xfs_showargs(XFS_M(root->d_sb), m);
1319}
1320
1321/*
1322 * This function fills in xfs_mount_t fields based on mount args.
1323 * Note: the superblock _has_ now been read in.
1324 */
1325STATIC int
1326xfs_finish_flags(
1327 struct xfs_mount *mp)
1328{
1329 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1330
1331 /* Fail a mount where the logbuf is smaller than the log stripe */
1332 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1333 if (mp->m_logbsize <= 0 &&
1334 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1335 mp->m_logbsize = mp->m_sb.sb_logsunit;
1336 } else if (mp->m_logbsize > 0 &&
1337 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1338 xfs_warn(mp,
1339 "logbuf size must be greater than or equal to log stripe size");
1340 return -EINVAL;
1341 }
1342 } else {
1343 /* Fail a mount if the logbuf is larger than 32K */
1344 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1345 xfs_warn(mp,
1346 "logbuf size for version 1 logs must be 16K or 32K");
1347 return -EINVAL;
1348 }
1349 }
1350
1351 /*
1352 * V5 filesystems always use attr2 format for attributes.
1353 */
1354 if (xfs_sb_version_hascrc(&mp->m_sb) &&
1355 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1356 xfs_warn(mp,
1357"Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1358 MNTOPT_NOATTR2, MNTOPT_ATTR2);
1359 return -EINVAL;
1360 }
1361
1362 /*
1363 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1364 * told by noattr2 to turn it off
1365 */
1366 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1367 !(mp->m_flags & XFS_MOUNT_NOATTR2))
1368 mp->m_flags |= XFS_MOUNT_ATTR2;
1369
1370 /*
1371 * prohibit r/w mounts of read-only filesystems
1372 */
1373 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1374 xfs_warn(mp,
1375 "cannot mount a read-only filesystem as read-write");
1376 return -EROFS;
1377 }
1378
1379 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1380 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1381 !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1382 xfs_warn(mp,
1383 "Super block does not support project and group quota together");
1384 return -EINVAL;
1385 }
1386
1387 return 0;
1388}
1389
1390STATIC int
1391xfs_fs_fill_super(
1392 struct super_block *sb,
1393 void *data,
1394 int silent)
1395{
1396 struct inode *root;
1397 struct xfs_mount *mp = NULL;
1398 int flags = 0, error = -ENOMEM;
1399
1400 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1401 if (!mp)
1402 goto out;
1403
1404 spin_lock_init(&mp->m_sb_lock);
1405 mutex_init(&mp->m_growlock);
1406 atomic_set(&mp->m_active_trans, 0);
1407 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1408 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1409
1410 mp->m_super = sb;
1411 sb->s_fs_info = mp;
1412
1413 error = xfs_parseargs(mp, (char *)data);
1414 if (error)
1415 goto out_free_fsname;
1416
1417 sb_min_blocksize(sb, BBSIZE);
1418 sb->s_xattr = xfs_xattr_handlers;
1419 sb->s_export_op = &xfs_export_operations;
1420#ifdef CONFIG_XFS_QUOTA
1421 sb->s_qcop = &xfs_quotactl_operations;
1422#endif
1423 sb->s_op = &xfs_super_operations;
1424
1425 if (silent)
1426 flags |= XFS_MFSI_QUIET;
1427
1428 error = xfs_open_devices(mp);
1429 if (error)
1430 goto out_free_fsname;
1431
1432 error = xfs_init_mount_workqueues(mp);
1433 if (error)
1434 goto out_close_devices;
1435
1436 error = xfs_icsb_init_counters(mp);
1437 if (error)
1438 goto out_destroy_workqueues;
1439
1440 error = xfs_readsb(mp, flags);
1441 if (error)
1442 goto out_destroy_counters;
1443
1444 error = xfs_finish_flags(mp);
1445 if (error)
1446 goto out_free_sb;
1447
1448 error = xfs_setup_devices(mp);
1449 if (error)
1450 goto out_free_sb;
1451
1452 error = xfs_filestream_mount(mp);
1453 if (error)
1454 goto out_free_sb;
1455
1456 /*
1457 * we must configure the block size in the superblock before we run the
1458 * full mount process as the mount process can lookup and cache inodes.
1459 */
1460 sb->s_magic = XFS_SB_MAGIC;
1461 sb->s_blocksize = mp->m_sb.sb_blocksize;
1462 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1463 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1464 sb->s_max_links = XFS_MAXLINK;
1465 sb->s_time_gran = 1;
1466 set_posix_acl_flag(sb);
1467
1468 /* version 5 superblocks support inode version counters. */
1469 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1470 sb->s_flags |= MS_I_VERSION;
1471
1472 error = xfs_mountfs(mp);
1473 if (error)
1474 goto out_filestream_unmount;
1475
1476 root = igrab(VFS_I(mp->m_rootip));
1477 if (!root) {
1478 error = -ENOENT;
1479 goto out_unmount;
1480 }
1481 sb->s_root = d_make_root(root);
1482 if (!sb->s_root) {
1483 error = -ENOMEM;
1484 goto out_unmount;
1485 }
1486
1487 return 0;
1488
1489 out_filestream_unmount:
1490 xfs_filestream_unmount(mp);
1491 out_free_sb:
1492 xfs_freesb(mp);
1493 out_destroy_counters:
1494 xfs_icsb_destroy_counters(mp);
1495out_destroy_workqueues:
1496 xfs_destroy_mount_workqueues(mp);
1497 out_close_devices:
1498 xfs_close_devices(mp);
1499 out_free_fsname:
1500 xfs_free_fsname(mp);
1501 kfree(mp);
1502 out:
1503 return error;
1504
1505 out_unmount:
1506 xfs_filestream_unmount(mp);
1507 xfs_unmountfs(mp);
1508 goto out_free_sb;
1509}
1510
1511STATIC struct dentry *
1512xfs_fs_mount(
1513 struct file_system_type *fs_type,
1514 int flags,
1515 const char *dev_name,
1516 void *data)
1517{
1518 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1519}
1520
1521static long
1522xfs_fs_nr_cached_objects(
1523 struct super_block *sb,
1524 int nid)
1525{
1526 return xfs_reclaim_inodes_count(XFS_M(sb));
1527}
1528
1529static long
1530xfs_fs_free_cached_objects(
1531 struct super_block *sb,
1532 long nr_to_scan,
1533 int nid)
1534{
1535 return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1536}
1537
1538static const struct super_operations xfs_super_operations = {
1539 .alloc_inode = xfs_fs_alloc_inode,
1540 .destroy_inode = xfs_fs_destroy_inode,
1541 .evict_inode = xfs_fs_evict_inode,
1542 .drop_inode = xfs_fs_drop_inode,
1543 .put_super = xfs_fs_put_super,
1544 .sync_fs = xfs_fs_sync_fs,
1545 .freeze_fs = xfs_fs_freeze,
1546 .unfreeze_fs = xfs_fs_unfreeze,
1547 .statfs = xfs_fs_statfs,
1548 .remount_fs = xfs_fs_remount,
1549 .show_options = xfs_fs_show_options,
1550 .nr_cached_objects = xfs_fs_nr_cached_objects,
1551 .free_cached_objects = xfs_fs_free_cached_objects,
1552};
1553
1554static struct file_system_type xfs_fs_type = {
1555 .owner = THIS_MODULE,
1556 .name = "xfs",
1557 .mount = xfs_fs_mount,
1558 .kill_sb = kill_block_super,
1559 .fs_flags = FS_REQUIRES_DEV,
1560};
1561MODULE_ALIAS_FS("xfs");
1562
1563STATIC int __init
1564xfs_init_zones(void)
1565{
1566
1567 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1568 if (!xfs_ioend_zone)
1569 goto out;
1570
1571 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1572 xfs_ioend_zone);
1573 if (!xfs_ioend_pool)
1574 goto out_destroy_ioend_zone;
1575
1576 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1577 "xfs_log_ticket");
1578 if (!xfs_log_ticket_zone)
1579 goto out_destroy_ioend_pool;
1580
1581 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1582 "xfs_bmap_free_item");
1583 if (!xfs_bmap_free_item_zone)
1584 goto out_destroy_log_ticket_zone;
1585
1586 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1587 "xfs_btree_cur");
1588 if (!xfs_btree_cur_zone)
1589 goto out_destroy_bmap_free_item_zone;
1590
1591 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1592 "xfs_da_state");
1593 if (!xfs_da_state_zone)
1594 goto out_destroy_btree_cur_zone;
1595
1596 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1597 if (!xfs_ifork_zone)
1598 goto out_destroy_da_state_zone;
1599
1600 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1601 if (!xfs_trans_zone)
1602 goto out_destroy_ifork_zone;
1603
1604 xfs_log_item_desc_zone =
1605 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1606 "xfs_log_item_desc");
1607 if (!xfs_log_item_desc_zone)
1608 goto out_destroy_trans_zone;
1609
1610 /*
1611 * The size of the zone allocated buf log item is the maximum
1612 * size possible under XFS. This wastes a little bit of memory,
1613 * but it is much faster.
1614 */
1615 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1616 "xfs_buf_item");
1617 if (!xfs_buf_item_zone)
1618 goto out_destroy_log_item_desc_zone;
1619
1620 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1621 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1622 sizeof(xfs_extent_t))), "xfs_efd_item");
1623 if (!xfs_efd_zone)
1624 goto out_destroy_buf_item_zone;
1625
1626 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1627 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1628 sizeof(xfs_extent_t))), "xfs_efi_item");
1629 if (!xfs_efi_zone)
1630 goto out_destroy_efd_zone;
1631
1632 xfs_inode_zone =
1633 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1634 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1635 xfs_fs_inode_init_once);
1636 if (!xfs_inode_zone)
1637 goto out_destroy_efi_zone;
1638
1639 xfs_ili_zone =
1640 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1641 KM_ZONE_SPREAD, NULL);
1642 if (!xfs_ili_zone)
1643 goto out_destroy_inode_zone;
1644 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1645 "xfs_icr");
1646 if (!xfs_icreate_zone)
1647 goto out_destroy_ili_zone;
1648
1649 return 0;
1650
1651 out_destroy_ili_zone:
1652 kmem_zone_destroy(xfs_ili_zone);
1653 out_destroy_inode_zone:
1654 kmem_zone_destroy(xfs_inode_zone);
1655 out_destroy_efi_zone:
1656 kmem_zone_destroy(xfs_efi_zone);
1657 out_destroy_efd_zone:
1658 kmem_zone_destroy(xfs_efd_zone);
1659 out_destroy_buf_item_zone:
1660 kmem_zone_destroy(xfs_buf_item_zone);
1661 out_destroy_log_item_desc_zone:
1662 kmem_zone_destroy(xfs_log_item_desc_zone);
1663 out_destroy_trans_zone:
1664 kmem_zone_destroy(xfs_trans_zone);
1665 out_destroy_ifork_zone:
1666 kmem_zone_destroy(xfs_ifork_zone);
1667 out_destroy_da_state_zone:
1668 kmem_zone_destroy(xfs_da_state_zone);
1669 out_destroy_btree_cur_zone:
1670 kmem_zone_destroy(xfs_btree_cur_zone);
1671 out_destroy_bmap_free_item_zone:
1672 kmem_zone_destroy(xfs_bmap_free_item_zone);
1673 out_destroy_log_ticket_zone:
1674 kmem_zone_destroy(xfs_log_ticket_zone);
1675 out_destroy_ioend_pool:
1676 mempool_destroy(xfs_ioend_pool);
1677 out_destroy_ioend_zone:
1678 kmem_zone_destroy(xfs_ioend_zone);
1679 out:
1680 return -ENOMEM;
1681}
1682
1683STATIC void
1684xfs_destroy_zones(void)
1685{
1686 /*
1687 * Make sure all delayed rcu free are flushed before we
1688 * destroy caches.
1689 */
1690 rcu_barrier();
1691 kmem_zone_destroy(xfs_icreate_zone);
1692 kmem_zone_destroy(xfs_ili_zone);
1693 kmem_zone_destroy(xfs_inode_zone);
1694 kmem_zone_destroy(xfs_efi_zone);
1695 kmem_zone_destroy(xfs_efd_zone);
1696 kmem_zone_destroy(xfs_buf_item_zone);
1697 kmem_zone_destroy(xfs_log_item_desc_zone);
1698 kmem_zone_destroy(xfs_trans_zone);
1699 kmem_zone_destroy(xfs_ifork_zone);
1700 kmem_zone_destroy(xfs_da_state_zone);
1701 kmem_zone_destroy(xfs_btree_cur_zone);
1702 kmem_zone_destroy(xfs_bmap_free_item_zone);
1703 kmem_zone_destroy(xfs_log_ticket_zone);
1704 mempool_destroy(xfs_ioend_pool);
1705 kmem_zone_destroy(xfs_ioend_zone);
1706
1707}
1708
1709STATIC int __init
1710xfs_init_workqueues(void)
1711{
1712 /*
1713 * The allocation workqueue can be used in memory reclaim situations
1714 * (writepage path), and parallelism is only limited by the number of
1715 * AGs in all the filesystems mounted. Hence use the default large
1716 * max_active value for this workqueue.
1717 */
1718 xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1719 if (!xfs_alloc_wq)
1720 return -ENOMEM;
1721
1722 return 0;
1723}
1724
1725STATIC void
1726xfs_destroy_workqueues(void)
1727{
1728 destroy_workqueue(xfs_alloc_wq);
1729}
1730
1731STATIC int __init
1732init_xfs_fs(void)
1733{
1734 int error;
1735
1736 printk(KERN_INFO XFS_VERSION_STRING " with "
1737 XFS_BUILD_OPTIONS " enabled\n");
1738
1739 xfs_dir_startup();
1740
1741 error = xfs_init_zones();
1742 if (error)
1743 goto out;
1744
1745 error = xfs_init_workqueues();
1746 if (error)
1747 goto out_destroy_zones;
1748
1749 error = xfs_mru_cache_init();
1750 if (error)
1751 goto out_destroy_wq;
1752
1753 error = xfs_buf_init();
1754 if (error)
1755 goto out_mru_cache_uninit;
1756
1757 error = xfs_init_procfs();
1758 if (error)
1759 goto out_buf_terminate;
1760
1761 error = xfs_sysctl_register();
1762 if (error)
1763 goto out_cleanup_procfs;
1764
1765 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1766 if (!xfs_kset) {
1767 error = -ENOMEM;
1768 goto out_sysctl_unregister;;
1769 }
1770
1771 error = xfs_qm_init();
1772 if (error)
1773 goto out_kset_unregister;
1774
1775 error = register_filesystem(&xfs_fs_type);
1776 if (error)
1777 goto out_qm_exit;
1778 return 0;
1779
1780 out_qm_exit:
1781 xfs_qm_exit();
1782 out_kset_unregister:
1783 kset_unregister(xfs_kset);
1784 out_sysctl_unregister:
1785 xfs_sysctl_unregister();
1786 out_cleanup_procfs:
1787 xfs_cleanup_procfs();
1788 out_buf_terminate:
1789 xfs_buf_terminate();
1790 out_mru_cache_uninit:
1791 xfs_mru_cache_uninit();
1792 out_destroy_wq:
1793 xfs_destroy_workqueues();
1794 out_destroy_zones:
1795 xfs_destroy_zones();
1796 out:
1797 return error;
1798}
1799
1800STATIC void __exit
1801exit_xfs_fs(void)
1802{
1803 xfs_qm_exit();
1804 unregister_filesystem(&xfs_fs_type);
1805 kset_unregister(xfs_kset);
1806 xfs_sysctl_unregister();
1807 xfs_cleanup_procfs();
1808 xfs_buf_terminate();
1809 xfs_mru_cache_uninit();
1810 xfs_destroy_workqueues();
1811 xfs_destroy_zones();
1812}
1813
1814module_init(init_xfs_fs);
1815module_exit(exit_xfs_fs);
1816
1817MODULE_AUTHOR("Silicon Graphics, Inc.");
1818MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1819MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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