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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_bit.h"
21#include "xfs_log.h"
22#include "xfs_inum.h"
23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_dir2.h"
27#include "xfs_alloc.h"
28#include "xfs_quota.h"
29#include "xfs_mount.h"
30#include "xfs_bmap_btree.h"
31#include "xfs_alloc_btree.h"
32#include "xfs_ialloc_btree.h"
33#include "xfs_dinode.h"
34#include "xfs_inode.h"
35#include "xfs_btree.h"
36#include "xfs_ialloc.h"
37#include "xfs_bmap.h"
38#include "xfs_rtalloc.h"
39#include "xfs_error.h"
40#include "xfs_itable.h"
41#include "xfs_fsops.h"
42#include "xfs_attr.h"
43#include "xfs_buf_item.h"
44#include "xfs_utils.h"
45#include "xfs_vnodeops.h"
46#include "xfs_log_priv.h"
47#include "xfs_trans_priv.h"
48#include "xfs_filestream.h"
49#include "xfs_da_btree.h"
50#include "xfs_extfree_item.h"
51#include "xfs_mru_cache.h"
52#include "xfs_inode_item.h"
53#include "xfs_sync.h"
54#include "xfs_trace.h"
55
56#include <linux/namei.h>
57#include <linux/init.h>
58#include <linux/slab.h>
59#include <linux/mount.h>
60#include <linux/mempool.h>
61#include <linux/writeback.h>
62#include <linux/kthread.h>
63#include <linux/freezer.h>
64#include <linux/parser.h>
65
66static const struct super_operations xfs_super_operations;
67static kmem_zone_t *xfs_ioend_zone;
68mempool_t *xfs_ioend_pool;
69
70#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
71#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
72#define MNTOPT_LOGDEV "logdev" /* log device */
73#define MNTOPT_RTDEV "rtdev" /* realtime I/O device */
74#define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */
75#define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */
76#define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */
77#define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */
78#define MNTOPT_SUNIT "sunit" /* data volume stripe unit */
79#define MNTOPT_SWIDTH "swidth" /* data volume stripe width */
80#define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */
81#define MNTOPT_MTPT "mtpt" /* filesystem mount point */
82#define MNTOPT_GRPID "grpid" /* group-ID from parent directory */
83#define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */
84#define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */
85#define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */
86#define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */
87#define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */
88#define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and
89 * unwritten extent conversion */
90#define MNTOPT_NOBARRIER "nobarrier" /* .. disable */
91#define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */
92#define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */
93#define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */
94#define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */
95#define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes
96 * in stat(). */
97#define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */
98#define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */
99#define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */
100#define MNTOPT_QUOTA "quota" /* disk quotas (user) */
101#define MNTOPT_NOQUOTA "noquota" /* no quotas */
102#define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */
103#define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */
104#define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */
105#define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */
106#define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */
107#define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */
108#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
109#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
110#define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
111#define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */
112#define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */
113#define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */
114#define MNTOPT_DISCARD "discard" /* Discard unused blocks */
115#define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */
116
117/*
118 * Table driven mount option parser.
119 *
120 * Currently only used for remount, but it will be used for mount
121 * in the future, too.
122 */
123enum {
124 Opt_barrier, Opt_nobarrier, Opt_err
125};
126
127static const match_table_t tokens = {
128 {Opt_barrier, "barrier"},
129 {Opt_nobarrier, "nobarrier"},
130 {Opt_err, NULL}
131};
132
133
134STATIC unsigned long
135suffix_strtoul(char *s, char **endp, unsigned int base)
136{
137 int last, shift_left_factor = 0;
138 char *value = s;
139
140 last = strlen(value) - 1;
141 if (value[last] == 'K' || value[last] == 'k') {
142 shift_left_factor = 10;
143 value[last] = '\0';
144 }
145 if (value[last] == 'M' || value[last] == 'm') {
146 shift_left_factor = 20;
147 value[last] = '\0';
148 }
149 if (value[last] == 'G' || value[last] == 'g') {
150 shift_left_factor = 30;
151 value[last] = '\0';
152 }
153
154 return simple_strtoul((const char *)s, endp, base) << shift_left_factor;
155}
156
157/*
158 * This function fills in xfs_mount_t fields based on mount args.
159 * Note: the superblock has _not_ yet been read in.
160 *
161 * Note that this function leaks the various device name allocations on
162 * failure. The caller takes care of them.
163 */
164STATIC int
165xfs_parseargs(
166 struct xfs_mount *mp,
167 char *options)
168{
169 struct super_block *sb = mp->m_super;
170 char *this_char, *value, *eov;
171 int dsunit = 0;
172 int dswidth = 0;
173 int iosize = 0;
174 __uint8_t iosizelog = 0;
175
176 /*
177 * set up the mount name first so all the errors will refer to the
178 * correct device.
179 */
180 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
181 if (!mp->m_fsname)
182 return ENOMEM;
183 mp->m_fsname_len = strlen(mp->m_fsname) + 1;
184
185 /*
186 * Copy binary VFS mount flags we are interested in.
187 */
188 if (sb->s_flags & MS_RDONLY)
189 mp->m_flags |= XFS_MOUNT_RDONLY;
190 if (sb->s_flags & MS_DIRSYNC)
191 mp->m_flags |= XFS_MOUNT_DIRSYNC;
192 if (sb->s_flags & MS_SYNCHRONOUS)
193 mp->m_flags |= XFS_MOUNT_WSYNC;
194
195 /*
196 * Set some default flags that could be cleared by the mount option
197 * parsing.
198 */
199 mp->m_flags |= XFS_MOUNT_BARRIER;
200 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
201 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
202 mp->m_flags |= XFS_MOUNT_DELAYLOG;
203
204 /*
205 * These can be overridden by the mount option parsing.
206 */
207 mp->m_logbufs = -1;
208 mp->m_logbsize = -1;
209
210 if (!options)
211 goto done;
212
213 while ((this_char = strsep(&options, ",")) != NULL) {
214 if (!*this_char)
215 continue;
216 if ((value = strchr(this_char, '=')) != NULL)
217 *value++ = 0;
218
219 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
220 if (!value || !*value) {
221 xfs_warn(mp, "%s option requires an argument",
222 this_char);
223 return EINVAL;
224 }
225 mp->m_logbufs = simple_strtoul(value, &eov, 10);
226 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
227 if (!value || !*value) {
228 xfs_warn(mp, "%s option requires an argument",
229 this_char);
230 return EINVAL;
231 }
232 mp->m_logbsize = suffix_strtoul(value, &eov, 10);
233 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
234 if (!value || !*value) {
235 xfs_warn(mp, "%s option requires an argument",
236 this_char);
237 return EINVAL;
238 }
239 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
240 if (!mp->m_logname)
241 return ENOMEM;
242 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
243 xfs_warn(mp, "%s option not allowed on this system",
244 this_char);
245 return EINVAL;
246 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
247 if (!value || !*value) {
248 xfs_warn(mp, "%s option requires an argument",
249 this_char);
250 return EINVAL;
251 }
252 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
253 if (!mp->m_rtname)
254 return ENOMEM;
255 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
256 if (!value || !*value) {
257 xfs_warn(mp, "%s option requires an argument",
258 this_char);
259 return EINVAL;
260 }
261 iosize = simple_strtoul(value, &eov, 10);
262 iosizelog = ffs(iosize) - 1;
263 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
264 if (!value || !*value) {
265 xfs_warn(mp, "%s option requires an argument",
266 this_char);
267 return EINVAL;
268 }
269 iosize = suffix_strtoul(value, &eov, 10);
270 iosizelog = ffs(iosize) - 1;
271 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
272 !strcmp(this_char, MNTOPT_BSDGROUPS)) {
273 mp->m_flags |= XFS_MOUNT_GRPID;
274 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
275 !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
276 mp->m_flags &= ~XFS_MOUNT_GRPID;
277 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
278 mp->m_flags |= XFS_MOUNT_WSYNC;
279 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
280 mp->m_flags |= XFS_MOUNT_NORECOVERY;
281 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
282 mp->m_flags |= XFS_MOUNT_NOALIGN;
283 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
284 mp->m_flags |= XFS_MOUNT_SWALLOC;
285 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
286 if (!value || !*value) {
287 xfs_warn(mp, "%s option requires an argument",
288 this_char);
289 return EINVAL;
290 }
291 dsunit = simple_strtoul(value, &eov, 10);
292 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
293 if (!value || !*value) {
294 xfs_warn(mp, "%s option requires an argument",
295 this_char);
296 return EINVAL;
297 }
298 dswidth = simple_strtoul(value, &eov, 10);
299 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
300 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
301#if !XFS_BIG_INUMS
302 xfs_warn(mp, "%s option not allowed on this system",
303 this_char);
304 return EINVAL;
305#endif
306 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
307 mp->m_flags |= XFS_MOUNT_NOUUID;
308 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
309 mp->m_flags |= XFS_MOUNT_BARRIER;
310 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
311 mp->m_flags &= ~XFS_MOUNT_BARRIER;
312 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
313 mp->m_flags |= XFS_MOUNT_IKEEP;
314 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
315 mp->m_flags &= ~XFS_MOUNT_IKEEP;
316 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
317 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
318 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
319 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
320 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
321 mp->m_flags |= XFS_MOUNT_ATTR2;
322 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
323 mp->m_flags &= ~XFS_MOUNT_ATTR2;
324 mp->m_flags |= XFS_MOUNT_NOATTR2;
325 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
326 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
327 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
328 mp->m_qflags &= ~(XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
329 XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
330 XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
331 XFS_UQUOTA_ENFD | XFS_OQUOTA_ENFD);
332 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
333 !strcmp(this_char, MNTOPT_UQUOTA) ||
334 !strcmp(this_char, MNTOPT_USRQUOTA)) {
335 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
336 XFS_UQUOTA_ENFD);
337 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
338 !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
339 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
340 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
341 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
342 !strcmp(this_char, MNTOPT_PRJQUOTA)) {
343 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
344 XFS_OQUOTA_ENFD);
345 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
346 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
347 mp->m_qflags &= ~XFS_OQUOTA_ENFD;
348 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
349 !strcmp(this_char, MNTOPT_GRPQUOTA)) {
350 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
351 XFS_OQUOTA_ENFD);
352 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
353 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
354 mp->m_qflags &= ~XFS_OQUOTA_ENFD;
355 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
356 mp->m_flags |= XFS_MOUNT_DELAYLOG;
357 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
358 mp->m_flags &= ~XFS_MOUNT_DELAYLOG;
359 xfs_warn(mp,
360 "nodelaylog is deprecated and will be removed in Linux 3.3");
361 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
362 mp->m_flags |= XFS_MOUNT_DISCARD;
363 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
364 mp->m_flags &= ~XFS_MOUNT_DISCARD;
365 } else if (!strcmp(this_char, "ihashsize")) {
366 xfs_warn(mp,
367 "ihashsize no longer used, option is deprecated.");
368 } else if (!strcmp(this_char, "osyncisdsync")) {
369 xfs_warn(mp,
370 "osyncisdsync has no effect, option is deprecated.");
371 } else if (!strcmp(this_char, "osyncisosync")) {
372 xfs_warn(mp,
373 "osyncisosync has no effect, option is deprecated.");
374 } else if (!strcmp(this_char, "irixsgid")) {
375 xfs_warn(mp,
376 "irixsgid is now a sysctl(2) variable, option is deprecated.");
377 } else {
378 xfs_warn(mp, "unknown mount option [%s].", this_char);
379 return EINVAL;
380 }
381 }
382
383 /*
384 * no recovery flag requires a read-only mount
385 */
386 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
387 !(mp->m_flags & XFS_MOUNT_RDONLY)) {
388 xfs_warn(mp, "no-recovery mounts must be read-only.");
389 return EINVAL;
390 }
391
392 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
393 xfs_warn(mp,
394 "sunit and swidth options incompatible with the noalign option");
395 return EINVAL;
396 }
397
398 if ((mp->m_flags & XFS_MOUNT_DISCARD) &&
399 !(mp->m_flags & XFS_MOUNT_DELAYLOG)) {
400 xfs_warn(mp,
401 "the discard option is incompatible with the nodelaylog 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 ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
413 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
414 xfs_warn(mp, "cannot mount with both project and group quota");
415 return EINVAL;
416 }
417
418 if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
419 xfs_warn(mp, "sunit and swidth must be specified together");
420 return EINVAL;
421 }
422
423 if (dsunit && (dswidth % dsunit != 0)) {
424 xfs_warn(mp,
425 "stripe width (%d) must be a multiple of the stripe unit (%d)",
426 dswidth, dsunit);
427 return EINVAL;
428 }
429
430done:
431 if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) {
432 /*
433 * At this point the superblock has not been read
434 * in, therefore we do not know the block size.
435 * Before the mount call ends we will convert
436 * these to FSBs.
437 */
438 if (dsunit) {
439 mp->m_dalign = dsunit;
440 mp->m_flags |= XFS_MOUNT_RETERR;
441 }
442
443 if (dswidth)
444 mp->m_swidth = dswidth;
445 }
446
447 if (mp->m_logbufs != -1 &&
448 mp->m_logbufs != 0 &&
449 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
450 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
451 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
452 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
453 return XFS_ERROR(EINVAL);
454 }
455 if (mp->m_logbsize != -1 &&
456 mp->m_logbsize != 0 &&
457 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
458 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
459 !is_power_of_2(mp->m_logbsize))) {
460 xfs_warn(mp,
461 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
462 mp->m_logbsize);
463 return XFS_ERROR(EINVAL);
464 }
465
466 if (iosizelog) {
467 if (iosizelog > XFS_MAX_IO_LOG ||
468 iosizelog < XFS_MIN_IO_LOG) {
469 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
470 iosizelog, XFS_MIN_IO_LOG,
471 XFS_MAX_IO_LOG);
472 return XFS_ERROR(EINVAL);
473 }
474
475 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
476 mp->m_readio_log = iosizelog;
477 mp->m_writeio_log = iosizelog;
478 }
479
480 return 0;
481}
482
483struct proc_xfs_info {
484 int flag;
485 char *str;
486};
487
488STATIC int
489xfs_showargs(
490 struct xfs_mount *mp,
491 struct seq_file *m)
492{
493 static struct proc_xfs_info xfs_info_set[] = {
494 /* the few simple ones we can get from the mount struct */
495 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP },
496 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC },
497 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN },
498 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC },
499 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID },
500 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY },
501 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 },
502 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
503 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
504 { XFS_MOUNT_DELAYLOG, "," MNTOPT_DELAYLOG },
505 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD },
506 { 0, NULL }
507 };
508 static struct proc_xfs_info xfs_info_unset[] = {
509 /* the few simple ones we can get from the mount struct */
510 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO },
511 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER },
512 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE },
513 { 0, NULL }
514 };
515 struct proc_xfs_info *xfs_infop;
516
517 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
518 if (mp->m_flags & xfs_infop->flag)
519 seq_puts(m, xfs_infop->str);
520 }
521 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
522 if (!(mp->m_flags & xfs_infop->flag))
523 seq_puts(m, xfs_infop->str);
524 }
525
526 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
527 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
528 (int)(1 << mp->m_writeio_log) >> 10);
529
530 if (mp->m_logbufs > 0)
531 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
532 if (mp->m_logbsize > 0)
533 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
534
535 if (mp->m_logname)
536 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
537 if (mp->m_rtname)
538 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
539
540 if (mp->m_dalign > 0)
541 seq_printf(m, "," MNTOPT_SUNIT "=%d",
542 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
543 if (mp->m_swidth > 0)
544 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
545 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
546
547 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
548 seq_puts(m, "," MNTOPT_USRQUOTA);
549 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
550 seq_puts(m, "," MNTOPT_UQUOTANOENF);
551
552 /* Either project or group quotas can be active, not both */
553
554 if (mp->m_qflags & XFS_PQUOTA_ACCT) {
555 if (mp->m_qflags & XFS_OQUOTA_ENFD)
556 seq_puts(m, "," MNTOPT_PRJQUOTA);
557 else
558 seq_puts(m, "," MNTOPT_PQUOTANOENF);
559 } else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
560 if (mp->m_qflags & XFS_OQUOTA_ENFD)
561 seq_puts(m, "," MNTOPT_GRPQUOTA);
562 else
563 seq_puts(m, "," MNTOPT_GQUOTANOENF);
564 }
565
566 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
567 seq_puts(m, "," MNTOPT_NOQUOTA);
568
569 return 0;
570}
571__uint64_t
572xfs_max_file_offset(
573 unsigned int blockshift)
574{
575 unsigned int pagefactor = 1;
576 unsigned int bitshift = BITS_PER_LONG - 1;
577
578 /* Figure out maximum filesize, on Linux this can depend on
579 * the filesystem blocksize (on 32 bit platforms).
580 * __block_write_begin does this in an [unsigned] long...
581 * page->index << (PAGE_CACHE_SHIFT - bbits)
582 * So, for page sized blocks (4K on 32 bit platforms),
583 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
584 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
585 * but for smaller blocksizes it is less (bbits = log2 bsize).
586 * Note1: get_block_t takes a long (implicit cast from above)
587 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
588 * can optionally convert the [unsigned] long from above into
589 * an [unsigned] long long.
590 */
591
592#if BITS_PER_LONG == 32
593# if defined(CONFIG_LBDAF)
594 ASSERT(sizeof(sector_t) == 8);
595 pagefactor = PAGE_CACHE_SIZE;
596 bitshift = BITS_PER_LONG;
597# else
598 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
599# endif
600#endif
601
602 return (((__uint64_t)pagefactor) << bitshift) - 1;
603}
604
605STATIC int
606xfs_blkdev_get(
607 xfs_mount_t *mp,
608 const char *name,
609 struct block_device **bdevp)
610{
611 int error = 0;
612
613 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
614 mp);
615 if (IS_ERR(*bdevp)) {
616 error = PTR_ERR(*bdevp);
617 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
618 }
619
620 return -error;
621}
622
623STATIC void
624xfs_blkdev_put(
625 struct block_device *bdev)
626{
627 if (bdev)
628 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
629}
630
631void
632xfs_blkdev_issue_flush(
633 xfs_buftarg_t *buftarg)
634{
635 blkdev_issue_flush(buftarg->bt_bdev, GFP_KERNEL, NULL);
636}
637
638STATIC void
639xfs_close_devices(
640 struct xfs_mount *mp)
641{
642 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
643 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
644 xfs_free_buftarg(mp, mp->m_logdev_targp);
645 xfs_blkdev_put(logdev);
646 }
647 if (mp->m_rtdev_targp) {
648 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
649 xfs_free_buftarg(mp, mp->m_rtdev_targp);
650 xfs_blkdev_put(rtdev);
651 }
652 xfs_free_buftarg(mp, mp->m_ddev_targp);
653}
654
655/*
656 * The file system configurations are:
657 * (1) device (partition) with data and internal log
658 * (2) logical volume with data and log subvolumes.
659 * (3) logical volume with data, log, and realtime subvolumes.
660 *
661 * We only have to handle opening the log and realtime volumes here if
662 * they are present. The data subvolume has already been opened by
663 * get_sb_bdev() and is stored in sb->s_bdev.
664 */
665STATIC int
666xfs_open_devices(
667 struct xfs_mount *mp)
668{
669 struct block_device *ddev = mp->m_super->s_bdev;
670 struct block_device *logdev = NULL, *rtdev = NULL;
671 int error;
672
673 /*
674 * Open real time and log devices - order is important.
675 */
676 if (mp->m_logname) {
677 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
678 if (error)
679 goto out;
680 }
681
682 if (mp->m_rtname) {
683 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
684 if (error)
685 goto out_close_logdev;
686
687 if (rtdev == ddev || rtdev == logdev) {
688 xfs_warn(mp,
689 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
690 error = EINVAL;
691 goto out_close_rtdev;
692 }
693 }
694
695 /*
696 * Setup xfs_mount buffer target pointers
697 */
698 error = ENOMEM;
699 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
700 if (!mp->m_ddev_targp)
701 goto out_close_rtdev;
702
703 if (rtdev) {
704 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
705 mp->m_fsname);
706 if (!mp->m_rtdev_targp)
707 goto out_free_ddev_targ;
708 }
709
710 if (logdev && logdev != ddev) {
711 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
712 mp->m_fsname);
713 if (!mp->m_logdev_targp)
714 goto out_free_rtdev_targ;
715 } else {
716 mp->m_logdev_targp = mp->m_ddev_targp;
717 }
718
719 return 0;
720
721 out_free_rtdev_targ:
722 if (mp->m_rtdev_targp)
723 xfs_free_buftarg(mp, mp->m_rtdev_targp);
724 out_free_ddev_targ:
725 xfs_free_buftarg(mp, mp->m_ddev_targp);
726 out_close_rtdev:
727 if (rtdev)
728 xfs_blkdev_put(rtdev);
729 out_close_logdev:
730 if (logdev && logdev != ddev)
731 xfs_blkdev_put(logdev);
732 out:
733 return error;
734}
735
736/*
737 * Setup xfs_mount buffer target pointers based on superblock
738 */
739STATIC int
740xfs_setup_devices(
741 struct xfs_mount *mp)
742{
743 int error;
744
745 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
746 mp->m_sb.sb_sectsize);
747 if (error)
748 return error;
749
750 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
751 unsigned int log_sector_size = BBSIZE;
752
753 if (xfs_sb_version_hassector(&mp->m_sb))
754 log_sector_size = mp->m_sb.sb_logsectsize;
755 error = xfs_setsize_buftarg(mp->m_logdev_targp,
756 mp->m_sb.sb_blocksize,
757 log_sector_size);
758 if (error)
759 return error;
760 }
761 if (mp->m_rtdev_targp) {
762 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
763 mp->m_sb.sb_blocksize,
764 mp->m_sb.sb_sectsize);
765 if (error)
766 return error;
767 }
768
769 return 0;
770}
771
772/* Catch misguided souls that try to use this interface on XFS */
773STATIC struct inode *
774xfs_fs_alloc_inode(
775 struct super_block *sb)
776{
777 BUG();
778 return NULL;
779}
780
781/*
782 * Now that the generic code is guaranteed not to be accessing
783 * the linux inode, we can reclaim the inode.
784 */
785STATIC void
786xfs_fs_destroy_inode(
787 struct inode *inode)
788{
789 struct xfs_inode *ip = XFS_I(inode);
790
791 trace_xfs_destroy_inode(ip);
792
793 XFS_STATS_INC(vn_reclaim);
794
795 /* bad inode, get out here ASAP */
796 if (is_bad_inode(inode))
797 goto out_reclaim;
798
799 xfs_ioend_wait(ip);
800
801 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
802
803 /*
804 * We should never get here with one of the reclaim flags already set.
805 */
806 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
807 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
808
809 /*
810 * We always use background reclaim here because even if the
811 * inode is clean, it still may be under IO and hence we have
812 * to take the flush lock. The background reclaim path handles
813 * this more efficiently than we can here, so simply let background
814 * reclaim tear down all inodes.
815 */
816out_reclaim:
817 xfs_inode_set_reclaim_tag(ip);
818}
819
820/*
821 * Slab object creation initialisation for the XFS inode.
822 * This covers only the idempotent fields in the XFS inode;
823 * all other fields need to be initialised on allocation
824 * from the slab. This avoids the need to repeatedly initialise
825 * fields in the xfs inode that left in the initialise state
826 * when freeing the inode.
827 */
828STATIC void
829xfs_fs_inode_init_once(
830 void *inode)
831{
832 struct xfs_inode *ip = inode;
833
834 memset(ip, 0, sizeof(struct xfs_inode));
835
836 /* vfs inode */
837 inode_init_once(VFS_I(ip));
838
839 /* xfs inode */
840 atomic_set(&ip->i_iocount, 0);
841 atomic_set(&ip->i_pincount, 0);
842 spin_lock_init(&ip->i_flags_lock);
843 init_waitqueue_head(&ip->i_ipin_wait);
844 /*
845 * Because we want to use a counting completion, complete
846 * the flush completion once to allow a single access to
847 * the flush completion without blocking.
848 */
849 init_completion(&ip->i_flush);
850 complete(&ip->i_flush);
851
852 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
853 "xfsino", ip->i_ino);
854}
855
856/*
857 * Dirty the XFS inode when mark_inode_dirty_sync() is called so that
858 * we catch unlogged VFS level updates to the inode.
859 *
860 * We need the barrier() to maintain correct ordering between unlogged
861 * updates and the transaction commit code that clears the i_update_core
862 * field. This requires all updates to be completed before marking the
863 * inode dirty.
864 */
865STATIC void
866xfs_fs_dirty_inode(
867 struct inode *inode,
868 int flags)
869{
870 barrier();
871 XFS_I(inode)->i_update_core = 1;
872}
873
874STATIC int
875xfs_log_inode(
876 struct xfs_inode *ip)
877{
878 struct xfs_mount *mp = ip->i_mount;
879 struct xfs_trans *tp;
880 int error;
881
882 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
883 error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
884 if (error) {
885 xfs_trans_cancel(tp, 0);
886 return error;
887 }
888
889 xfs_ilock(ip, XFS_ILOCK_EXCL);
890 xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
891 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
892 return xfs_trans_commit(tp, 0);
893}
894
895STATIC int
896xfs_fs_write_inode(
897 struct inode *inode,
898 struct writeback_control *wbc)
899{
900 struct xfs_inode *ip = XFS_I(inode);
901 struct xfs_mount *mp = ip->i_mount;
902 int error = EAGAIN;
903
904 trace_xfs_write_inode(ip);
905
906 if (XFS_FORCED_SHUTDOWN(mp))
907 return -XFS_ERROR(EIO);
908 if (!ip->i_update_core)
909 return 0;
910
911 if (wbc->sync_mode == WB_SYNC_ALL) {
912 /*
913 * Make sure the inode has made it it into the log. Instead
914 * of forcing it all the way to stable storage using a
915 * synchronous transaction we let the log force inside the
916 * ->sync_fs call do that for thus, which reduces the number
917 * of synchronous log foces dramatically.
918 */
919 xfs_ioend_wait(ip);
920 error = xfs_log_inode(ip);
921 if (error)
922 goto out;
923 return 0;
924 } else {
925 /*
926 * We make this non-blocking if the inode is contended, return
927 * EAGAIN to indicate to the caller that they did not succeed.
928 * This prevents the flush path from blocking on inodes inside
929 * another operation right now, they get caught later by
930 * xfs_sync.
931 */
932 if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
933 goto out;
934
935 if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip))
936 goto out_unlock;
937
938 /*
939 * Now we have the flush lock and the inode is not pinned, we
940 * can check if the inode is really clean as we know that
941 * there are no pending transaction completions, it is not
942 * waiting on the delayed write queue and there is no IO in
943 * progress.
944 */
945 if (xfs_inode_clean(ip)) {
946 xfs_ifunlock(ip);
947 error = 0;
948 goto out_unlock;
949 }
950 error = xfs_iflush(ip, SYNC_TRYLOCK);
951 }
952
953 out_unlock:
954 xfs_iunlock(ip, XFS_ILOCK_SHARED);
955 out:
956 /*
957 * if we failed to write out the inode then mark
958 * it dirty again so we'll try again later.
959 */
960 if (error)
961 xfs_mark_inode_dirty_sync(ip);
962 return -error;
963}
964
965STATIC void
966xfs_fs_evict_inode(
967 struct inode *inode)
968{
969 xfs_inode_t *ip = XFS_I(inode);
970
971 trace_xfs_evict_inode(ip);
972
973 truncate_inode_pages(&inode->i_data, 0);
974 end_writeback(inode);
975 XFS_STATS_INC(vn_rele);
976 XFS_STATS_INC(vn_remove);
977 XFS_STATS_DEC(vn_active);
978
979 /*
980 * The iolock is used by the file system to coordinate reads,
981 * writes, and block truncates. Up to this point the lock
982 * protected concurrent accesses by users of the inode. But
983 * from here forward we're doing some final processing of the
984 * inode because we're done with it, and although we reuse the
985 * iolock for protection it is really a distinct lock class
986 * (in the lockdep sense) from before. To keep lockdep happy
987 * (and basically indicate what we are doing), we explicitly
988 * re-init the iolock here.
989 */
990 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
991 mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
992 lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
993 &xfs_iolock_reclaimable, "xfs_iolock_reclaimable");
994
995 xfs_inactive(ip);
996}
997
998STATIC void
999xfs_free_fsname(
1000 struct xfs_mount *mp)
1001{
1002 kfree(mp->m_fsname);
1003 kfree(mp->m_rtname);
1004 kfree(mp->m_logname);
1005}
1006
1007STATIC void
1008xfs_fs_put_super(
1009 struct super_block *sb)
1010{
1011 struct xfs_mount *mp = XFS_M(sb);
1012
1013 xfs_syncd_stop(mp);
1014
1015 /*
1016 * Blow away any referenced inode in the filestreams cache.
1017 * This can and will cause log traffic as inodes go inactive
1018 * here.
1019 */
1020 xfs_filestream_unmount(mp);
1021
1022 XFS_bflush(mp->m_ddev_targp);
1023
1024 xfs_unmountfs(mp);
1025 xfs_freesb(mp);
1026 xfs_icsb_destroy_counters(mp);
1027 xfs_close_devices(mp);
1028 xfs_free_fsname(mp);
1029 kfree(mp);
1030}
1031
1032STATIC int
1033xfs_fs_sync_fs(
1034 struct super_block *sb,
1035 int wait)
1036{
1037 struct xfs_mount *mp = XFS_M(sb);
1038 int error;
1039
1040 /*
1041 * Not much we can do for the first async pass. Writing out the
1042 * superblock would be counter-productive as we are going to redirty
1043 * when writing out other data and metadata (and writing out a single
1044 * block is quite fast anyway).
1045 *
1046 * Try to asynchronously kick off quota syncing at least.
1047 */
1048 if (!wait) {
1049 xfs_qm_sync(mp, SYNC_TRYLOCK);
1050 return 0;
1051 }
1052
1053 error = xfs_quiesce_data(mp);
1054 if (error)
1055 return -error;
1056
1057 if (laptop_mode) {
1058 /*
1059 * The disk must be active because we're syncing.
1060 * We schedule xfssyncd now (now that the disk is
1061 * active) instead of later (when it might not be).
1062 */
1063 flush_delayed_work_sync(&mp->m_sync_work);
1064 }
1065
1066 return 0;
1067}
1068
1069STATIC int
1070xfs_fs_statfs(
1071 struct dentry *dentry,
1072 struct kstatfs *statp)
1073{
1074 struct xfs_mount *mp = XFS_M(dentry->d_sb);
1075 xfs_sb_t *sbp = &mp->m_sb;
1076 struct xfs_inode *ip = XFS_I(dentry->d_inode);
1077 __uint64_t fakeinos, id;
1078 xfs_extlen_t lsize;
1079 __int64_t ffree;
1080
1081 statp->f_type = XFS_SB_MAGIC;
1082 statp->f_namelen = MAXNAMELEN - 1;
1083
1084 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1085 statp->f_fsid.val[0] = (u32)id;
1086 statp->f_fsid.val[1] = (u32)(id >> 32);
1087
1088 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1089
1090 spin_lock(&mp->m_sb_lock);
1091 statp->f_bsize = sbp->sb_blocksize;
1092 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1093 statp->f_blocks = sbp->sb_dblocks - lsize;
1094 statp->f_bfree = statp->f_bavail =
1095 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1096 fakeinos = statp->f_bfree << sbp->sb_inopblog;
1097 statp->f_files =
1098 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1099 if (mp->m_maxicount)
1100 statp->f_files = min_t(typeof(statp->f_files),
1101 statp->f_files,
1102 mp->m_maxicount);
1103
1104 /* make sure statp->f_ffree does not underflow */
1105 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1106 statp->f_ffree = max_t(__int64_t, ffree, 0);
1107
1108 spin_unlock(&mp->m_sb_lock);
1109
1110 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
1111 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
1112 (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
1113 xfs_qm_statvfs(ip, statp);
1114 return 0;
1115}
1116
1117STATIC void
1118xfs_save_resvblks(struct xfs_mount *mp)
1119{
1120 __uint64_t resblks = 0;
1121
1122 mp->m_resblks_save = mp->m_resblks;
1123 xfs_reserve_blocks(mp, &resblks, NULL);
1124}
1125
1126STATIC void
1127xfs_restore_resvblks(struct xfs_mount *mp)
1128{
1129 __uint64_t resblks;
1130
1131 if (mp->m_resblks_save) {
1132 resblks = mp->m_resblks_save;
1133 mp->m_resblks_save = 0;
1134 } else
1135 resblks = xfs_default_resblks(mp);
1136
1137 xfs_reserve_blocks(mp, &resblks, NULL);
1138}
1139
1140STATIC int
1141xfs_fs_remount(
1142 struct super_block *sb,
1143 int *flags,
1144 char *options)
1145{
1146 struct xfs_mount *mp = XFS_M(sb);
1147 substring_t args[MAX_OPT_ARGS];
1148 char *p;
1149 int error;
1150
1151 while ((p = strsep(&options, ",")) != NULL) {
1152 int token;
1153
1154 if (!*p)
1155 continue;
1156
1157 token = match_token(p, tokens, args);
1158 switch (token) {
1159 case Opt_barrier:
1160 mp->m_flags |= XFS_MOUNT_BARRIER;
1161 break;
1162 case Opt_nobarrier:
1163 mp->m_flags &= ~XFS_MOUNT_BARRIER;
1164 break;
1165 default:
1166 /*
1167 * Logically we would return an error here to prevent
1168 * users from believing they might have changed
1169 * mount options using remount which can't be changed.
1170 *
1171 * But unfortunately mount(8) adds all options from
1172 * mtab and fstab to the mount arguments in some cases
1173 * so we can't blindly reject options, but have to
1174 * check for each specified option if it actually
1175 * differs from the currently set option and only
1176 * reject it if that's the case.
1177 *
1178 * Until that is implemented we return success for
1179 * every remount request, and silently ignore all
1180 * options that we can't actually change.
1181 */
1182#if 0
1183 xfs_info(mp,
1184 "mount option \"%s\" not supported for remount\n", p);
1185 return -EINVAL;
1186#else
1187 break;
1188#endif
1189 }
1190 }
1191
1192 /* ro -> rw */
1193 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1194 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1195
1196 /*
1197 * If this is the first remount to writeable state we
1198 * might have some superblock changes to update.
1199 */
1200 if (mp->m_update_flags) {
1201 error = xfs_mount_log_sb(mp, mp->m_update_flags);
1202 if (error) {
1203 xfs_warn(mp, "failed to write sb changes");
1204 return error;
1205 }
1206 mp->m_update_flags = 0;
1207 }
1208
1209 /*
1210 * Fill out the reserve pool if it is empty. Use the stashed
1211 * value if it is non-zero, otherwise go with the default.
1212 */
1213 xfs_restore_resvblks(mp);
1214 }
1215
1216 /* rw -> ro */
1217 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1218 /*
1219 * After we have synced the data but before we sync the
1220 * metadata, we need to free up the reserve block pool so that
1221 * the used block count in the superblock on disk is correct at
1222 * the end of the remount. Stash the current reserve pool size
1223 * so that if we get remounted rw, we can return it to the same
1224 * size.
1225 */
1226
1227 xfs_quiesce_data(mp);
1228 xfs_save_resvblks(mp);
1229 xfs_quiesce_attr(mp);
1230 mp->m_flags |= XFS_MOUNT_RDONLY;
1231 }
1232
1233 return 0;
1234}
1235
1236/*
1237 * Second stage of a freeze. The data is already frozen so we only
1238 * need to take care of the metadata. Once that's done write a dummy
1239 * record to dirty the log in case of a crash while frozen.
1240 */
1241STATIC int
1242xfs_fs_freeze(
1243 struct super_block *sb)
1244{
1245 struct xfs_mount *mp = XFS_M(sb);
1246
1247 xfs_save_resvblks(mp);
1248 xfs_quiesce_attr(mp);
1249 return -xfs_fs_log_dummy(mp);
1250}
1251
1252STATIC int
1253xfs_fs_unfreeze(
1254 struct super_block *sb)
1255{
1256 struct xfs_mount *mp = XFS_M(sb);
1257
1258 xfs_restore_resvblks(mp);
1259 return 0;
1260}
1261
1262STATIC int
1263xfs_fs_show_options(
1264 struct seq_file *m,
1265 struct vfsmount *mnt)
1266{
1267 return -xfs_showargs(XFS_M(mnt->mnt_sb), m);
1268}
1269
1270/*
1271 * This function fills in xfs_mount_t fields based on mount args.
1272 * Note: the superblock _has_ now been read in.
1273 */
1274STATIC int
1275xfs_finish_flags(
1276 struct xfs_mount *mp)
1277{
1278 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1279
1280 /* Fail a mount where the logbuf is smaller than the log stripe */
1281 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1282 if (mp->m_logbsize <= 0 &&
1283 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1284 mp->m_logbsize = mp->m_sb.sb_logsunit;
1285 } else if (mp->m_logbsize > 0 &&
1286 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1287 xfs_warn(mp,
1288 "logbuf size must be greater than or equal to log stripe size");
1289 return XFS_ERROR(EINVAL);
1290 }
1291 } else {
1292 /* Fail a mount if the logbuf is larger than 32K */
1293 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1294 xfs_warn(mp,
1295 "logbuf size for version 1 logs must be 16K or 32K");
1296 return XFS_ERROR(EINVAL);
1297 }
1298 }
1299
1300 /*
1301 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1302 * told by noattr2 to turn it off
1303 */
1304 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1305 !(mp->m_flags & XFS_MOUNT_NOATTR2))
1306 mp->m_flags |= XFS_MOUNT_ATTR2;
1307
1308 /*
1309 * prohibit r/w mounts of read-only filesystems
1310 */
1311 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1312 xfs_warn(mp,
1313 "cannot mount a read-only filesystem as read-write");
1314 return XFS_ERROR(EROFS);
1315 }
1316
1317 return 0;
1318}
1319
1320STATIC int
1321xfs_fs_fill_super(
1322 struct super_block *sb,
1323 void *data,
1324 int silent)
1325{
1326 struct inode *root;
1327 struct xfs_mount *mp = NULL;
1328 int flags = 0, error = ENOMEM;
1329
1330 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1331 if (!mp)
1332 goto out;
1333
1334 spin_lock_init(&mp->m_sb_lock);
1335 mutex_init(&mp->m_growlock);
1336 atomic_set(&mp->m_active_trans, 0);
1337
1338 mp->m_super = sb;
1339 sb->s_fs_info = mp;
1340
1341 error = xfs_parseargs(mp, (char *)data);
1342 if (error)
1343 goto out_free_fsname;
1344
1345 sb_min_blocksize(sb, BBSIZE);
1346 sb->s_xattr = xfs_xattr_handlers;
1347 sb->s_export_op = &xfs_export_operations;
1348#ifdef CONFIG_XFS_QUOTA
1349 sb->s_qcop = &xfs_quotactl_operations;
1350#endif
1351 sb->s_op = &xfs_super_operations;
1352
1353 if (silent)
1354 flags |= XFS_MFSI_QUIET;
1355
1356 error = xfs_open_devices(mp);
1357 if (error)
1358 goto out_free_fsname;
1359
1360 error = xfs_icsb_init_counters(mp);
1361 if (error)
1362 goto out_close_devices;
1363
1364 error = xfs_readsb(mp, flags);
1365 if (error)
1366 goto out_destroy_counters;
1367
1368 error = xfs_finish_flags(mp);
1369 if (error)
1370 goto out_free_sb;
1371
1372 error = xfs_setup_devices(mp);
1373 if (error)
1374 goto out_free_sb;
1375
1376 error = xfs_filestream_mount(mp);
1377 if (error)
1378 goto out_free_sb;
1379
1380 /*
1381 * we must configure the block size in the superblock before we run the
1382 * full mount process as the mount process can lookup and cache inodes.
1383 * For the same reason we must also initialise the syncd and register
1384 * the inode cache shrinker so that inodes can be reclaimed during
1385 * operations like a quotacheck that iterate all inodes in the
1386 * filesystem.
1387 */
1388 sb->s_magic = XFS_SB_MAGIC;
1389 sb->s_blocksize = mp->m_sb.sb_blocksize;
1390 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1391 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1392 sb->s_time_gran = 1;
1393 set_posix_acl_flag(sb);
1394
1395 error = xfs_mountfs(mp);
1396 if (error)
1397 goto out_filestream_unmount;
1398
1399 error = xfs_syncd_init(mp);
1400 if (error)
1401 goto out_unmount;
1402
1403 root = igrab(VFS_I(mp->m_rootip));
1404 if (!root) {
1405 error = ENOENT;
1406 goto out_syncd_stop;
1407 }
1408 if (is_bad_inode(root)) {
1409 error = EINVAL;
1410 goto out_syncd_stop;
1411 }
1412 sb->s_root = d_alloc_root(root);
1413 if (!sb->s_root) {
1414 error = ENOMEM;
1415 goto out_iput;
1416 }
1417
1418 return 0;
1419
1420 out_filestream_unmount:
1421 xfs_filestream_unmount(mp);
1422 out_free_sb:
1423 xfs_freesb(mp);
1424 out_destroy_counters:
1425 xfs_icsb_destroy_counters(mp);
1426 out_close_devices:
1427 xfs_close_devices(mp);
1428 out_free_fsname:
1429 xfs_free_fsname(mp);
1430 kfree(mp);
1431 out:
1432 return -error;
1433
1434 out_iput:
1435 iput(root);
1436 out_syncd_stop:
1437 xfs_syncd_stop(mp);
1438 out_unmount:
1439 /*
1440 * Blow away any referenced inode in the filestreams cache.
1441 * This can and will cause log traffic as inodes go inactive
1442 * here.
1443 */
1444 xfs_filestream_unmount(mp);
1445
1446 XFS_bflush(mp->m_ddev_targp);
1447
1448 xfs_unmountfs(mp);
1449 goto out_free_sb;
1450}
1451
1452STATIC struct dentry *
1453xfs_fs_mount(
1454 struct file_system_type *fs_type,
1455 int flags,
1456 const char *dev_name,
1457 void *data)
1458{
1459 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1460}
1461
1462static int
1463xfs_fs_nr_cached_objects(
1464 struct super_block *sb)
1465{
1466 return xfs_reclaim_inodes_count(XFS_M(sb));
1467}
1468
1469static void
1470xfs_fs_free_cached_objects(
1471 struct super_block *sb,
1472 int nr_to_scan)
1473{
1474 xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1475}
1476
1477static const struct super_operations xfs_super_operations = {
1478 .alloc_inode = xfs_fs_alloc_inode,
1479 .destroy_inode = xfs_fs_destroy_inode,
1480 .dirty_inode = xfs_fs_dirty_inode,
1481 .write_inode = xfs_fs_write_inode,
1482 .evict_inode = xfs_fs_evict_inode,
1483 .put_super = xfs_fs_put_super,
1484 .sync_fs = xfs_fs_sync_fs,
1485 .freeze_fs = xfs_fs_freeze,
1486 .unfreeze_fs = xfs_fs_unfreeze,
1487 .statfs = xfs_fs_statfs,
1488 .remount_fs = xfs_fs_remount,
1489 .show_options = xfs_fs_show_options,
1490 .nr_cached_objects = xfs_fs_nr_cached_objects,
1491 .free_cached_objects = xfs_fs_free_cached_objects,
1492};
1493
1494static struct file_system_type xfs_fs_type = {
1495 .owner = THIS_MODULE,
1496 .name = "xfs",
1497 .mount = xfs_fs_mount,
1498 .kill_sb = kill_block_super,
1499 .fs_flags = FS_REQUIRES_DEV,
1500};
1501
1502STATIC int __init
1503xfs_init_zones(void)
1504{
1505
1506 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1507 if (!xfs_ioend_zone)
1508 goto out;
1509
1510 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1511 xfs_ioend_zone);
1512 if (!xfs_ioend_pool)
1513 goto out_destroy_ioend_zone;
1514
1515 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1516 "xfs_log_ticket");
1517 if (!xfs_log_ticket_zone)
1518 goto out_destroy_ioend_pool;
1519
1520 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1521 "xfs_bmap_free_item");
1522 if (!xfs_bmap_free_item_zone)
1523 goto out_destroy_log_ticket_zone;
1524
1525 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1526 "xfs_btree_cur");
1527 if (!xfs_btree_cur_zone)
1528 goto out_destroy_bmap_free_item_zone;
1529
1530 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1531 "xfs_da_state");
1532 if (!xfs_da_state_zone)
1533 goto out_destroy_btree_cur_zone;
1534
1535 xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
1536 if (!xfs_dabuf_zone)
1537 goto out_destroy_da_state_zone;
1538
1539 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1540 if (!xfs_ifork_zone)
1541 goto out_destroy_dabuf_zone;
1542
1543 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1544 if (!xfs_trans_zone)
1545 goto out_destroy_ifork_zone;
1546
1547 xfs_log_item_desc_zone =
1548 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1549 "xfs_log_item_desc");
1550 if (!xfs_log_item_desc_zone)
1551 goto out_destroy_trans_zone;
1552
1553 /*
1554 * The size of the zone allocated buf log item is the maximum
1555 * size possible under XFS. This wastes a little bit of memory,
1556 * but it is much faster.
1557 */
1558 xfs_buf_item_zone = kmem_zone_init((sizeof(xfs_buf_log_item_t) +
1559 (((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) /
1560 NBWORD) * sizeof(int))), "xfs_buf_item");
1561 if (!xfs_buf_item_zone)
1562 goto out_destroy_log_item_desc_zone;
1563
1564 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1565 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1566 sizeof(xfs_extent_t))), "xfs_efd_item");
1567 if (!xfs_efd_zone)
1568 goto out_destroy_buf_item_zone;
1569
1570 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1571 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1572 sizeof(xfs_extent_t))), "xfs_efi_item");
1573 if (!xfs_efi_zone)
1574 goto out_destroy_efd_zone;
1575
1576 xfs_inode_zone =
1577 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1578 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1579 xfs_fs_inode_init_once);
1580 if (!xfs_inode_zone)
1581 goto out_destroy_efi_zone;
1582
1583 xfs_ili_zone =
1584 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1585 KM_ZONE_SPREAD, NULL);
1586 if (!xfs_ili_zone)
1587 goto out_destroy_inode_zone;
1588
1589 return 0;
1590
1591 out_destroy_inode_zone:
1592 kmem_zone_destroy(xfs_inode_zone);
1593 out_destroy_efi_zone:
1594 kmem_zone_destroy(xfs_efi_zone);
1595 out_destroy_efd_zone:
1596 kmem_zone_destroy(xfs_efd_zone);
1597 out_destroy_buf_item_zone:
1598 kmem_zone_destroy(xfs_buf_item_zone);
1599 out_destroy_log_item_desc_zone:
1600 kmem_zone_destroy(xfs_log_item_desc_zone);
1601 out_destroy_trans_zone:
1602 kmem_zone_destroy(xfs_trans_zone);
1603 out_destroy_ifork_zone:
1604 kmem_zone_destroy(xfs_ifork_zone);
1605 out_destroy_dabuf_zone:
1606 kmem_zone_destroy(xfs_dabuf_zone);
1607 out_destroy_da_state_zone:
1608 kmem_zone_destroy(xfs_da_state_zone);
1609 out_destroy_btree_cur_zone:
1610 kmem_zone_destroy(xfs_btree_cur_zone);
1611 out_destroy_bmap_free_item_zone:
1612 kmem_zone_destroy(xfs_bmap_free_item_zone);
1613 out_destroy_log_ticket_zone:
1614 kmem_zone_destroy(xfs_log_ticket_zone);
1615 out_destroy_ioend_pool:
1616 mempool_destroy(xfs_ioend_pool);
1617 out_destroy_ioend_zone:
1618 kmem_zone_destroy(xfs_ioend_zone);
1619 out:
1620 return -ENOMEM;
1621}
1622
1623STATIC void
1624xfs_destroy_zones(void)
1625{
1626 kmem_zone_destroy(xfs_ili_zone);
1627 kmem_zone_destroy(xfs_inode_zone);
1628 kmem_zone_destroy(xfs_efi_zone);
1629 kmem_zone_destroy(xfs_efd_zone);
1630 kmem_zone_destroy(xfs_buf_item_zone);
1631 kmem_zone_destroy(xfs_log_item_desc_zone);
1632 kmem_zone_destroy(xfs_trans_zone);
1633 kmem_zone_destroy(xfs_ifork_zone);
1634 kmem_zone_destroy(xfs_dabuf_zone);
1635 kmem_zone_destroy(xfs_da_state_zone);
1636 kmem_zone_destroy(xfs_btree_cur_zone);
1637 kmem_zone_destroy(xfs_bmap_free_item_zone);
1638 kmem_zone_destroy(xfs_log_ticket_zone);
1639 mempool_destroy(xfs_ioend_pool);
1640 kmem_zone_destroy(xfs_ioend_zone);
1641
1642}
1643
1644STATIC int __init
1645xfs_init_workqueues(void)
1646{
1647 /*
1648 * max_active is set to 8 to give enough concurency to allow
1649 * multiple work operations on each CPU to run. This allows multiple
1650 * filesystems to be running sync work concurrently, and scales with
1651 * the number of CPUs in the system.
1652 */
1653 xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_CPU_INTENSIVE, 8);
1654 if (!xfs_syncd_wq)
1655 return -ENOMEM;
1656 return 0;
1657}
1658
1659STATIC void
1660xfs_destroy_workqueues(void)
1661{
1662 destroy_workqueue(xfs_syncd_wq);
1663}
1664
1665STATIC int __init
1666init_xfs_fs(void)
1667{
1668 int error;
1669
1670 printk(KERN_INFO XFS_VERSION_STRING " with "
1671 XFS_BUILD_OPTIONS " enabled\n");
1672
1673 xfs_ioend_init();
1674 xfs_dir_startup();
1675
1676 error = xfs_init_zones();
1677 if (error)
1678 goto out;
1679
1680 error = xfs_init_workqueues();
1681 if (error)
1682 goto out_destroy_zones;
1683
1684 error = xfs_mru_cache_init();
1685 if (error)
1686 goto out_destroy_wq;
1687
1688 error = xfs_filestream_init();
1689 if (error)
1690 goto out_mru_cache_uninit;
1691
1692 error = xfs_buf_init();
1693 if (error)
1694 goto out_filestream_uninit;
1695
1696 error = xfs_init_procfs();
1697 if (error)
1698 goto out_buf_terminate;
1699
1700 error = xfs_sysctl_register();
1701 if (error)
1702 goto out_cleanup_procfs;
1703
1704 vfs_initquota();
1705
1706 error = register_filesystem(&xfs_fs_type);
1707 if (error)
1708 goto out_sysctl_unregister;
1709 return 0;
1710
1711 out_sysctl_unregister:
1712 xfs_sysctl_unregister();
1713 out_cleanup_procfs:
1714 xfs_cleanup_procfs();
1715 out_buf_terminate:
1716 xfs_buf_terminate();
1717 out_filestream_uninit:
1718 xfs_filestream_uninit();
1719 out_mru_cache_uninit:
1720 xfs_mru_cache_uninit();
1721 out_destroy_wq:
1722 xfs_destroy_workqueues();
1723 out_destroy_zones:
1724 xfs_destroy_zones();
1725 out:
1726 return error;
1727}
1728
1729STATIC void __exit
1730exit_xfs_fs(void)
1731{
1732 vfs_exitquota();
1733 unregister_filesystem(&xfs_fs_type);
1734 xfs_sysctl_unregister();
1735 xfs_cleanup_procfs();
1736 xfs_buf_terminate();
1737 xfs_filestream_uninit();
1738 xfs_mru_cache_uninit();
1739 xfs_destroy_workqueues();
1740 xfs_destroy_zones();
1741}
1742
1743module_init(init_xfs_fs);
1744module_exit(exit_xfs_fs);
1745
1746MODULE_AUTHOR("Silicon Graphics, Inc.");
1747MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1748MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6
7#include "xfs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_sb.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_btree.h"
16#include "xfs_bmap.h"
17#include "xfs_alloc.h"
18#include "xfs_fsops.h"
19#include "xfs_trans.h"
20#include "xfs_buf_item.h"
21#include "xfs_log.h"
22#include "xfs_log_priv.h"
23#include "xfs_dir2.h"
24#include "xfs_extfree_item.h"
25#include "xfs_mru_cache.h"
26#include "xfs_inode_item.h"
27#include "xfs_icache.h"
28#include "xfs_trace.h"
29#include "xfs_icreate_item.h"
30#include "xfs_filestream.h"
31#include "xfs_quota.h"
32#include "xfs_sysfs.h"
33#include "xfs_ondisk.h"
34#include "xfs_rmap_item.h"
35#include "xfs_refcount_item.h"
36#include "xfs_bmap_item.h"
37#include "xfs_reflink.h"
38#include "xfs_pwork.h"
39#include "xfs_ag.h"
40#include "xfs_defer.h"
41#include "xfs_attr_item.h"
42#include "xfs_xattr.h"
43#include "xfs_iunlink_item.h"
44#include "xfs_dahash_test.h"
45#include "xfs_rtbitmap.h"
46#include "xfs_exchmaps_item.h"
47#include "xfs_parent.h"
48#include "xfs_rtalloc.h"
49#include "scrub/stats.h"
50#include "scrub/rcbag_btree.h"
51
52#include <linux/magic.h>
53#include <linux/fs_context.h>
54#include <linux/fs_parser.h>
55
56static const struct super_operations xfs_super_operations;
57
58static struct dentry *xfs_debugfs; /* top-level xfs debugfs dir */
59static struct kset *xfs_kset; /* top-level xfs sysfs dir */
60#ifdef DEBUG
61static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
62#endif
63
64enum xfs_dax_mode {
65 XFS_DAX_INODE = 0,
66 XFS_DAX_ALWAYS = 1,
67 XFS_DAX_NEVER = 2,
68};
69
70/* Were quota mount options provided? Must use the upper 16 bits of qflags. */
71#define XFS_QFLAGS_MNTOPTS (1U << 31)
72
73static void
74xfs_mount_set_dax_mode(
75 struct xfs_mount *mp,
76 enum xfs_dax_mode mode)
77{
78 switch (mode) {
79 case XFS_DAX_INODE:
80 mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER);
81 break;
82 case XFS_DAX_ALWAYS:
83 mp->m_features |= XFS_FEAT_DAX_ALWAYS;
84 mp->m_features &= ~XFS_FEAT_DAX_NEVER;
85 break;
86 case XFS_DAX_NEVER:
87 mp->m_features |= XFS_FEAT_DAX_NEVER;
88 mp->m_features &= ~XFS_FEAT_DAX_ALWAYS;
89 break;
90 }
91}
92
93static const struct constant_table dax_param_enums[] = {
94 {"inode", XFS_DAX_INODE },
95 {"always", XFS_DAX_ALWAYS },
96 {"never", XFS_DAX_NEVER },
97 {}
98};
99
100/*
101 * Table driven mount option parser.
102 */
103enum {
104 Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
105 Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
106 Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
107 Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
108 Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
109 Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
110 Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
111 Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
112 Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
113};
114
115static const struct fs_parameter_spec xfs_fs_parameters[] = {
116 fsparam_u32("logbufs", Opt_logbufs),
117 fsparam_string("logbsize", Opt_logbsize),
118 fsparam_string("logdev", Opt_logdev),
119 fsparam_string("rtdev", Opt_rtdev),
120 fsparam_flag("wsync", Opt_wsync),
121 fsparam_flag("noalign", Opt_noalign),
122 fsparam_flag("swalloc", Opt_swalloc),
123 fsparam_u32("sunit", Opt_sunit),
124 fsparam_u32("swidth", Opt_swidth),
125 fsparam_flag("nouuid", Opt_nouuid),
126 fsparam_flag("grpid", Opt_grpid),
127 fsparam_flag("nogrpid", Opt_nogrpid),
128 fsparam_flag("bsdgroups", Opt_bsdgroups),
129 fsparam_flag("sysvgroups", Opt_sysvgroups),
130 fsparam_string("allocsize", Opt_allocsize),
131 fsparam_flag("norecovery", Opt_norecovery),
132 fsparam_flag("inode64", Opt_inode64),
133 fsparam_flag("inode32", Opt_inode32),
134 fsparam_flag("ikeep", Opt_ikeep),
135 fsparam_flag("noikeep", Opt_noikeep),
136 fsparam_flag("largeio", Opt_largeio),
137 fsparam_flag("nolargeio", Opt_nolargeio),
138 fsparam_flag("attr2", Opt_attr2),
139 fsparam_flag("noattr2", Opt_noattr2),
140 fsparam_flag("filestreams", Opt_filestreams),
141 fsparam_flag("quota", Opt_quota),
142 fsparam_flag("noquota", Opt_noquota),
143 fsparam_flag("usrquota", Opt_usrquota),
144 fsparam_flag("grpquota", Opt_grpquota),
145 fsparam_flag("prjquota", Opt_prjquota),
146 fsparam_flag("uquota", Opt_uquota),
147 fsparam_flag("gquota", Opt_gquota),
148 fsparam_flag("pquota", Opt_pquota),
149 fsparam_flag("uqnoenforce", Opt_uqnoenforce),
150 fsparam_flag("gqnoenforce", Opt_gqnoenforce),
151 fsparam_flag("pqnoenforce", Opt_pqnoenforce),
152 fsparam_flag("qnoenforce", Opt_qnoenforce),
153 fsparam_flag("discard", Opt_discard),
154 fsparam_flag("nodiscard", Opt_nodiscard),
155 fsparam_flag("dax", Opt_dax),
156 fsparam_enum("dax", Opt_dax_enum, dax_param_enums),
157 {}
158};
159
160struct proc_xfs_info {
161 uint64_t flag;
162 char *str;
163};
164
165static int
166xfs_fs_show_options(
167 struct seq_file *m,
168 struct dentry *root)
169{
170 static struct proc_xfs_info xfs_info_set[] = {
171 /* the few simple ones we can get from the mount struct */
172 { XFS_FEAT_IKEEP, ",ikeep" },
173 { XFS_FEAT_WSYNC, ",wsync" },
174 { XFS_FEAT_NOALIGN, ",noalign" },
175 { XFS_FEAT_SWALLOC, ",swalloc" },
176 { XFS_FEAT_NOUUID, ",nouuid" },
177 { XFS_FEAT_NORECOVERY, ",norecovery" },
178 { XFS_FEAT_ATTR2, ",attr2" },
179 { XFS_FEAT_FILESTREAMS, ",filestreams" },
180 { XFS_FEAT_GRPID, ",grpid" },
181 { XFS_FEAT_DISCARD, ",discard" },
182 { XFS_FEAT_LARGE_IOSIZE, ",largeio" },
183 { XFS_FEAT_DAX_ALWAYS, ",dax=always" },
184 { XFS_FEAT_DAX_NEVER, ",dax=never" },
185 { 0, NULL }
186 };
187 struct xfs_mount *mp = XFS_M(root->d_sb);
188 struct proc_xfs_info *xfs_infop;
189
190 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
191 if (mp->m_features & xfs_infop->flag)
192 seq_puts(m, xfs_infop->str);
193 }
194
195 seq_printf(m, ",inode%d", xfs_has_small_inums(mp) ? 32 : 64);
196
197 if (xfs_has_allocsize(mp))
198 seq_printf(m, ",allocsize=%dk",
199 (1 << mp->m_allocsize_log) >> 10);
200
201 if (mp->m_logbufs > 0)
202 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
203 if (mp->m_logbsize > 0)
204 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
205
206 if (mp->m_logname)
207 seq_show_option(m, "logdev", mp->m_logname);
208 if (mp->m_rtname)
209 seq_show_option(m, "rtdev", mp->m_rtname);
210
211 if (mp->m_dalign > 0)
212 seq_printf(m, ",sunit=%d",
213 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
214 if (mp->m_swidth > 0)
215 seq_printf(m, ",swidth=%d",
216 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
217
218 if (mp->m_qflags & XFS_UQUOTA_ENFD)
219 seq_puts(m, ",usrquota");
220 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
221 seq_puts(m, ",uqnoenforce");
222
223 if (mp->m_qflags & XFS_PQUOTA_ENFD)
224 seq_puts(m, ",prjquota");
225 else if (mp->m_qflags & XFS_PQUOTA_ACCT)
226 seq_puts(m, ",pqnoenforce");
227
228 if (mp->m_qflags & XFS_GQUOTA_ENFD)
229 seq_puts(m, ",grpquota");
230 else if (mp->m_qflags & XFS_GQUOTA_ACCT)
231 seq_puts(m, ",gqnoenforce");
232
233 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
234 seq_puts(m, ",noquota");
235
236 return 0;
237}
238
239static bool
240xfs_set_inode_alloc_perag(
241 struct xfs_perag *pag,
242 xfs_ino_t ino,
243 xfs_agnumber_t max_metadata)
244{
245 if (!xfs_is_inode32(pag_mount(pag))) {
246 set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
247 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
248 return false;
249 }
250
251 if (ino > XFS_MAXINUMBER_32) {
252 clear_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
253 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
254 return false;
255 }
256
257 set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
258 if (pag_agno(pag) < max_metadata)
259 set_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
260 else
261 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
262 return true;
263}
264
265/*
266 * Set parameters for inode allocation heuristics, taking into account
267 * filesystem size and inode32/inode64 mount options; i.e. specifically
268 * whether or not XFS_FEAT_SMALL_INUMS is set.
269 *
270 * Inode allocation patterns are altered only if inode32 is requested
271 * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large.
272 * If altered, XFS_OPSTATE_INODE32 is set as well.
273 *
274 * An agcount independent of that in the mount structure is provided
275 * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
276 * to the potentially higher ag count.
277 *
278 * Returns the maximum AG index which may contain inodes.
279 */
280xfs_agnumber_t
281xfs_set_inode_alloc(
282 struct xfs_mount *mp,
283 xfs_agnumber_t agcount)
284{
285 xfs_agnumber_t index;
286 xfs_agnumber_t maxagi = 0;
287 xfs_sb_t *sbp = &mp->m_sb;
288 xfs_agnumber_t max_metadata;
289 xfs_agino_t agino;
290 xfs_ino_t ino;
291
292 /*
293 * Calculate how much should be reserved for inodes to meet
294 * the max inode percentage. Used only for inode32.
295 */
296 if (M_IGEO(mp)->maxicount) {
297 uint64_t icount;
298
299 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
300 do_div(icount, 100);
301 icount += sbp->sb_agblocks - 1;
302 do_div(icount, sbp->sb_agblocks);
303 max_metadata = icount;
304 } else {
305 max_metadata = agcount;
306 }
307
308 /* Get the last possible inode in the filesystem */
309 agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
310 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
311
312 /*
313 * If user asked for no more than 32-bit inodes, and the fs is
314 * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter
315 * the allocator to accommodate the request.
316 */
317 if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32)
318 xfs_set_inode32(mp);
319 else
320 xfs_clear_inode32(mp);
321
322 for (index = 0; index < agcount; index++) {
323 struct xfs_perag *pag;
324
325 ino = XFS_AGINO_TO_INO(mp, index, agino);
326
327 pag = xfs_perag_get(mp, index);
328 if (xfs_set_inode_alloc_perag(pag, ino, max_metadata))
329 maxagi++;
330 xfs_perag_put(pag);
331 }
332
333 return xfs_is_inode32(mp) ? maxagi : agcount;
334}
335
336static int
337xfs_setup_dax_always(
338 struct xfs_mount *mp)
339{
340 if (!mp->m_ddev_targp->bt_daxdev &&
341 (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) {
342 xfs_alert(mp,
343 "DAX unsupported by block device. Turning off DAX.");
344 goto disable_dax;
345 }
346
347 if (mp->m_super->s_blocksize != PAGE_SIZE) {
348 xfs_alert(mp,
349 "DAX not supported for blocksize. Turning off DAX.");
350 goto disable_dax;
351 }
352
353 if (xfs_has_reflink(mp) &&
354 bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
355 xfs_alert(mp,
356 "DAX and reflink cannot work with multi-partitions!");
357 return -EINVAL;
358 }
359
360 return 0;
361
362disable_dax:
363 xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
364 return 0;
365}
366
367STATIC int
368xfs_blkdev_get(
369 xfs_mount_t *mp,
370 const char *name,
371 struct file **bdev_filep)
372{
373 int error = 0;
374
375 *bdev_filep = bdev_file_open_by_path(name,
376 BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,
377 mp->m_super, &fs_holder_ops);
378 if (IS_ERR(*bdev_filep)) {
379 error = PTR_ERR(*bdev_filep);
380 *bdev_filep = NULL;
381 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
382 }
383
384 return error;
385}
386
387STATIC void
388xfs_shutdown_devices(
389 struct xfs_mount *mp)
390{
391 /*
392 * Udev is triggered whenever anyone closes a block device or unmounts
393 * a file systemm on a block device.
394 * The default udev rules invoke blkid to read the fs super and create
395 * symlinks to the bdev under /dev/disk. For this, it uses buffered
396 * reads through the page cache.
397 *
398 * xfs_db also uses buffered reads to examine metadata. There is no
399 * coordination between xfs_db and udev, which means that they can run
400 * concurrently. Note there is no coordination between the kernel and
401 * blkid either.
402 *
403 * On a system with 64k pages, the page cache can cache the superblock
404 * and the root inode (and hence the root directory) with the same 64k
405 * page. If udev spawns blkid after the mkfs and the system is busy
406 * enough that it is still running when xfs_db starts up, they'll both
407 * read from the same page in the pagecache.
408 *
409 * The unmount writes updated inode metadata to disk directly. The XFS
410 * buffer cache does not use the bdev pagecache, so it needs to
411 * invalidate that pagecache on unmount. If the above scenario occurs,
412 * the pagecache no longer reflects what's on disk, xfs_db reads the
413 * stale metadata, and fails to find /a. Most of the time this succeeds
414 * because closing a bdev invalidates the page cache, but when processes
415 * race, everyone loses.
416 */
417 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
418 blkdev_issue_flush(mp->m_logdev_targp->bt_bdev);
419 invalidate_bdev(mp->m_logdev_targp->bt_bdev);
420 }
421 if (mp->m_rtdev_targp) {
422 blkdev_issue_flush(mp->m_rtdev_targp->bt_bdev);
423 invalidate_bdev(mp->m_rtdev_targp->bt_bdev);
424 }
425 blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
426 invalidate_bdev(mp->m_ddev_targp->bt_bdev);
427}
428
429/*
430 * The file system configurations are:
431 * (1) device (partition) with data and internal log
432 * (2) logical volume with data and log subvolumes.
433 * (3) logical volume with data, log, and realtime subvolumes.
434 *
435 * We only have to handle opening the log and realtime volumes here if
436 * they are present. The data subvolume has already been opened by
437 * get_sb_bdev() and is stored in sb->s_bdev.
438 */
439STATIC int
440xfs_open_devices(
441 struct xfs_mount *mp)
442{
443 struct super_block *sb = mp->m_super;
444 struct block_device *ddev = sb->s_bdev;
445 struct file *logdev_file = NULL, *rtdev_file = NULL;
446 int error;
447
448 /*
449 * Open real time and log devices - order is important.
450 */
451 if (mp->m_logname) {
452 error = xfs_blkdev_get(mp, mp->m_logname, &logdev_file);
453 if (error)
454 return error;
455 }
456
457 if (mp->m_rtname) {
458 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev_file);
459 if (error)
460 goto out_close_logdev;
461
462 if (file_bdev(rtdev_file) == ddev ||
463 (logdev_file &&
464 file_bdev(rtdev_file) == file_bdev(logdev_file))) {
465 xfs_warn(mp,
466 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
467 error = -EINVAL;
468 goto out_close_rtdev;
469 }
470 }
471
472 /*
473 * Setup xfs_mount buffer target pointers
474 */
475 error = -ENOMEM;
476 mp->m_ddev_targp = xfs_alloc_buftarg(mp, sb->s_bdev_file);
477 if (!mp->m_ddev_targp)
478 goto out_close_rtdev;
479
480 if (rtdev_file) {
481 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev_file);
482 if (!mp->m_rtdev_targp)
483 goto out_free_ddev_targ;
484 }
485
486 if (logdev_file && file_bdev(logdev_file) != ddev) {
487 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev_file);
488 if (!mp->m_logdev_targp)
489 goto out_free_rtdev_targ;
490 } else {
491 mp->m_logdev_targp = mp->m_ddev_targp;
492 /* Handle won't be used, drop it */
493 if (logdev_file)
494 bdev_fput(logdev_file);
495 }
496
497 return 0;
498
499 out_free_rtdev_targ:
500 if (mp->m_rtdev_targp)
501 xfs_free_buftarg(mp->m_rtdev_targp);
502 out_free_ddev_targ:
503 xfs_free_buftarg(mp->m_ddev_targp);
504 out_close_rtdev:
505 if (rtdev_file)
506 bdev_fput(rtdev_file);
507 out_close_logdev:
508 if (logdev_file)
509 bdev_fput(logdev_file);
510 return error;
511}
512
513/*
514 * Setup xfs_mount buffer target pointers based on superblock
515 */
516STATIC int
517xfs_setup_devices(
518 struct xfs_mount *mp)
519{
520 int error;
521
522 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
523 if (error)
524 return error;
525
526 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
527 unsigned int log_sector_size = BBSIZE;
528
529 if (xfs_has_sector(mp))
530 log_sector_size = mp->m_sb.sb_logsectsize;
531 error = xfs_setsize_buftarg(mp->m_logdev_targp,
532 log_sector_size);
533 if (error)
534 return error;
535 }
536 if (mp->m_rtdev_targp) {
537 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
538 mp->m_sb.sb_sectsize);
539 if (error)
540 return error;
541 }
542
543 return 0;
544}
545
546STATIC int
547xfs_init_mount_workqueues(
548 struct xfs_mount *mp)
549{
550 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
551 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
552 1, mp->m_super->s_id);
553 if (!mp->m_buf_workqueue)
554 goto out;
555
556 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
557 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
558 0, mp->m_super->s_id);
559 if (!mp->m_unwritten_workqueue)
560 goto out_destroy_buf;
561
562 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
563 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
564 0, mp->m_super->s_id);
565 if (!mp->m_reclaim_workqueue)
566 goto out_destroy_unwritten;
567
568 mp->m_blockgc_wq = alloc_workqueue("xfs-blockgc/%s",
569 XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
570 0, mp->m_super->s_id);
571 if (!mp->m_blockgc_wq)
572 goto out_destroy_reclaim;
573
574 mp->m_inodegc_wq = alloc_workqueue("xfs-inodegc/%s",
575 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
576 1, mp->m_super->s_id);
577 if (!mp->m_inodegc_wq)
578 goto out_destroy_blockgc;
579
580 mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
581 XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
582 if (!mp->m_sync_workqueue)
583 goto out_destroy_inodegc;
584
585 return 0;
586
587out_destroy_inodegc:
588 destroy_workqueue(mp->m_inodegc_wq);
589out_destroy_blockgc:
590 destroy_workqueue(mp->m_blockgc_wq);
591out_destroy_reclaim:
592 destroy_workqueue(mp->m_reclaim_workqueue);
593out_destroy_unwritten:
594 destroy_workqueue(mp->m_unwritten_workqueue);
595out_destroy_buf:
596 destroy_workqueue(mp->m_buf_workqueue);
597out:
598 return -ENOMEM;
599}
600
601STATIC void
602xfs_destroy_mount_workqueues(
603 struct xfs_mount *mp)
604{
605 destroy_workqueue(mp->m_sync_workqueue);
606 destroy_workqueue(mp->m_blockgc_wq);
607 destroy_workqueue(mp->m_inodegc_wq);
608 destroy_workqueue(mp->m_reclaim_workqueue);
609 destroy_workqueue(mp->m_unwritten_workqueue);
610 destroy_workqueue(mp->m_buf_workqueue);
611}
612
613static void
614xfs_flush_inodes_worker(
615 struct work_struct *work)
616{
617 struct xfs_mount *mp = container_of(work, struct xfs_mount,
618 m_flush_inodes_work);
619 struct super_block *sb = mp->m_super;
620
621 if (down_read_trylock(&sb->s_umount)) {
622 sync_inodes_sb(sb);
623 up_read(&sb->s_umount);
624 }
625}
626
627/*
628 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
629 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
630 * for IO to complete so that we effectively throttle multiple callers to the
631 * rate at which IO is completing.
632 */
633void
634xfs_flush_inodes(
635 struct xfs_mount *mp)
636{
637 /*
638 * If flush_work() returns true then that means we waited for a flush
639 * which was already in progress. Don't bother running another scan.
640 */
641 if (flush_work(&mp->m_flush_inodes_work))
642 return;
643
644 queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
645 flush_work(&mp->m_flush_inodes_work);
646}
647
648/* Catch misguided souls that try to use this interface on XFS */
649STATIC struct inode *
650xfs_fs_alloc_inode(
651 struct super_block *sb)
652{
653 BUG();
654 return NULL;
655}
656
657/*
658 * Now that the generic code is guaranteed not to be accessing
659 * the linux inode, we can inactivate and reclaim the inode.
660 */
661STATIC void
662xfs_fs_destroy_inode(
663 struct inode *inode)
664{
665 struct xfs_inode *ip = XFS_I(inode);
666
667 trace_xfs_destroy_inode(ip);
668
669 ASSERT(!rwsem_is_locked(&inode->i_rwsem));
670 XFS_STATS_INC(ip->i_mount, vn_rele);
671 XFS_STATS_INC(ip->i_mount, vn_remove);
672 xfs_inode_mark_reclaimable(ip);
673}
674
675static void
676xfs_fs_dirty_inode(
677 struct inode *inode,
678 int flags)
679{
680 struct xfs_inode *ip = XFS_I(inode);
681 struct xfs_mount *mp = ip->i_mount;
682 struct xfs_trans *tp;
683
684 if (!(inode->i_sb->s_flags & SB_LAZYTIME))
685 return;
686
687 /*
688 * Only do the timestamp update if the inode is dirty (I_DIRTY_SYNC)
689 * and has dirty timestamp (I_DIRTY_TIME). I_DIRTY_TIME can be passed
690 * in flags possibly together with I_DIRTY_SYNC.
691 */
692 if ((flags & ~I_DIRTY_TIME) != I_DIRTY_SYNC || !(flags & I_DIRTY_TIME))
693 return;
694
695 if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
696 return;
697 xfs_ilock(ip, XFS_ILOCK_EXCL);
698 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
699 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
700 xfs_trans_commit(tp);
701}
702
703/*
704 * Slab object creation initialisation for the XFS inode.
705 * This covers only the idempotent fields in the XFS inode;
706 * all other fields need to be initialised on allocation
707 * from the slab. This avoids the need to repeatedly initialise
708 * fields in the xfs inode that left in the initialise state
709 * when freeing the inode.
710 */
711STATIC void
712xfs_fs_inode_init_once(
713 void *inode)
714{
715 struct xfs_inode *ip = inode;
716
717 memset(ip, 0, sizeof(struct xfs_inode));
718
719 /* vfs inode */
720 inode_init_once(VFS_I(ip));
721
722 /* xfs inode */
723 atomic_set(&ip->i_pincount, 0);
724 spin_lock_init(&ip->i_flags_lock);
725 init_rwsem(&ip->i_lock);
726}
727
728/*
729 * We do an unlocked check for XFS_IDONTCACHE here because we are already
730 * serialised against cache hits here via the inode->i_lock and igrab() in
731 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
732 * racing with us, and it avoids needing to grab a spinlock here for every inode
733 * we drop the final reference on.
734 */
735STATIC int
736xfs_fs_drop_inode(
737 struct inode *inode)
738{
739 struct xfs_inode *ip = XFS_I(inode);
740
741 /*
742 * If this unlinked inode is in the middle of recovery, don't
743 * drop the inode just yet; log recovery will take care of
744 * that. See the comment for this inode flag.
745 */
746 if (ip->i_flags & XFS_IRECOVERY) {
747 ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
748 return 0;
749 }
750
751 return generic_drop_inode(inode);
752}
753
754static void
755xfs_mount_free(
756 struct xfs_mount *mp)
757{
758 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
759 xfs_free_buftarg(mp->m_logdev_targp);
760 if (mp->m_rtdev_targp)
761 xfs_free_buftarg(mp->m_rtdev_targp);
762 if (mp->m_ddev_targp)
763 xfs_free_buftarg(mp->m_ddev_targp);
764
765 debugfs_remove(mp->m_debugfs);
766 kfree(mp->m_rtname);
767 kfree(mp->m_logname);
768 kfree(mp);
769}
770
771STATIC int
772xfs_fs_sync_fs(
773 struct super_block *sb,
774 int wait)
775{
776 struct xfs_mount *mp = XFS_M(sb);
777 int error;
778
779 trace_xfs_fs_sync_fs(mp, __return_address);
780
781 /*
782 * Doing anything during the async pass would be counterproductive.
783 */
784 if (!wait)
785 return 0;
786
787 error = xfs_log_force(mp, XFS_LOG_SYNC);
788 if (error)
789 return error;
790
791 if (laptop_mode) {
792 /*
793 * The disk must be active because we're syncing.
794 * We schedule log work now (now that the disk is
795 * active) instead of later (when it might not be).
796 */
797 flush_delayed_work(&mp->m_log->l_work);
798 }
799
800 /*
801 * If we are called with page faults frozen out, it means we are about
802 * to freeze the transaction subsystem. Take the opportunity to shut
803 * down inodegc because once SB_FREEZE_FS is set it's too late to
804 * prevent inactivation races with freeze. The fs doesn't get called
805 * again by the freezing process until after SB_FREEZE_FS has been set,
806 * so it's now or never. Same logic applies to speculative allocation
807 * garbage collection.
808 *
809 * We don't care if this is a normal syncfs call that does this or
810 * freeze that does this - we can run this multiple times without issue
811 * and we won't race with a restart because a restart can only occur
812 * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
813 */
814 if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
815 xfs_inodegc_stop(mp);
816 xfs_blockgc_stop(mp);
817 }
818
819 return 0;
820}
821
822STATIC int
823xfs_fs_statfs(
824 struct dentry *dentry,
825 struct kstatfs *statp)
826{
827 struct xfs_mount *mp = XFS_M(dentry->d_sb);
828 xfs_sb_t *sbp = &mp->m_sb;
829 struct xfs_inode *ip = XFS_I(d_inode(dentry));
830 uint64_t fakeinos, id;
831 uint64_t icount;
832 uint64_t ifree;
833 uint64_t fdblocks;
834 xfs_extlen_t lsize;
835 int64_t ffree;
836
837 /*
838 * Expedite background inodegc but don't wait. We do not want to block
839 * here waiting hours for a billion extent file to be truncated.
840 */
841 xfs_inodegc_push(mp);
842
843 statp->f_type = XFS_SUPER_MAGIC;
844 statp->f_namelen = MAXNAMELEN - 1;
845
846 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
847 statp->f_fsid = u64_to_fsid(id);
848
849 icount = percpu_counter_sum(&mp->m_icount);
850 ifree = percpu_counter_sum(&mp->m_ifree);
851 fdblocks = percpu_counter_sum(&mp->m_fdblocks);
852
853 spin_lock(&mp->m_sb_lock);
854 statp->f_bsize = sbp->sb_blocksize;
855 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
856 statp->f_blocks = sbp->sb_dblocks - lsize;
857 spin_unlock(&mp->m_sb_lock);
858
859 /* make sure statp->f_bfree does not underflow */
860 statp->f_bfree = max_t(int64_t, 0,
861 fdblocks - xfs_fdblocks_unavailable(mp));
862 statp->f_bavail = statp->f_bfree;
863
864 fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
865 statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
866 if (M_IGEO(mp)->maxicount)
867 statp->f_files = min_t(typeof(statp->f_files),
868 statp->f_files,
869 M_IGEO(mp)->maxicount);
870
871 /* If sb_icount overshot maxicount, report actual allocation */
872 statp->f_files = max_t(typeof(statp->f_files),
873 statp->f_files,
874 sbp->sb_icount);
875
876 /* make sure statp->f_ffree does not underflow */
877 ffree = statp->f_files - (icount - ifree);
878 statp->f_ffree = max_t(int64_t, ffree, 0);
879
880 if (XFS_IS_REALTIME_MOUNT(mp) &&
881 (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
882 s64 freertx;
883
884 statp->f_blocks = sbp->sb_rblocks;
885 freertx = percpu_counter_sum_positive(&mp->m_frextents);
886 statp->f_bavail = statp->f_bfree =
887 xfs_rtbxlen_to_blen(mp, freertx);
888 }
889
890 if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
891 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
892 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
893 xfs_qm_statvfs(ip, statp);
894
895 return 0;
896}
897
898STATIC void
899xfs_save_resvblks(struct xfs_mount *mp)
900{
901 mp->m_resblks_save = mp->m_resblks;
902 xfs_reserve_blocks(mp, 0);
903}
904
905STATIC void
906xfs_restore_resvblks(struct xfs_mount *mp)
907{
908 uint64_t resblks;
909
910 if (mp->m_resblks_save) {
911 resblks = mp->m_resblks_save;
912 mp->m_resblks_save = 0;
913 } else
914 resblks = xfs_default_resblks(mp);
915
916 xfs_reserve_blocks(mp, resblks);
917}
918
919/*
920 * Second stage of a freeze. The data is already frozen so we only
921 * need to take care of the metadata. Once that's done sync the superblock
922 * to the log to dirty it in case of a crash while frozen. This ensures that we
923 * will recover the unlinked inode lists on the next mount.
924 */
925STATIC int
926xfs_fs_freeze(
927 struct super_block *sb)
928{
929 struct xfs_mount *mp = XFS_M(sb);
930 unsigned int flags;
931 int ret;
932
933 /*
934 * The filesystem is now frozen far enough that memory reclaim
935 * cannot safely operate on the filesystem. Hence we need to
936 * set a GFP_NOFS context here to avoid recursion deadlocks.
937 */
938 flags = memalloc_nofs_save();
939 xfs_save_resvblks(mp);
940 ret = xfs_log_quiesce(mp);
941 memalloc_nofs_restore(flags);
942
943 /*
944 * For read-write filesystems, we need to restart the inodegc on error
945 * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
946 * going to be run to restart it now. We are at SB_FREEZE_FS level
947 * here, so we can restart safely without racing with a stop in
948 * xfs_fs_sync_fs().
949 */
950 if (ret && !xfs_is_readonly(mp)) {
951 xfs_blockgc_start(mp);
952 xfs_inodegc_start(mp);
953 }
954
955 return ret;
956}
957
958STATIC int
959xfs_fs_unfreeze(
960 struct super_block *sb)
961{
962 struct xfs_mount *mp = XFS_M(sb);
963
964 xfs_restore_resvblks(mp);
965 xfs_log_work_queue(mp);
966
967 /*
968 * Don't reactivate the inodegc worker on a readonly filesystem because
969 * inodes are sent directly to reclaim. Don't reactivate the blockgc
970 * worker because there are no speculative preallocations on a readonly
971 * filesystem.
972 */
973 if (!xfs_is_readonly(mp)) {
974 xfs_blockgc_start(mp);
975 xfs_inodegc_start(mp);
976 }
977
978 return 0;
979}
980
981/*
982 * This function fills in xfs_mount_t fields based on mount args.
983 * Note: the superblock _has_ now been read in.
984 */
985STATIC int
986xfs_finish_flags(
987 struct xfs_mount *mp)
988{
989 /* Fail a mount where the logbuf is smaller than the log stripe */
990 if (xfs_has_logv2(mp)) {
991 if (mp->m_logbsize <= 0 &&
992 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
993 mp->m_logbsize = mp->m_sb.sb_logsunit;
994 } else if (mp->m_logbsize > 0 &&
995 mp->m_logbsize < mp->m_sb.sb_logsunit) {
996 xfs_warn(mp,
997 "logbuf size must be greater than or equal to log stripe size");
998 return -EINVAL;
999 }
1000 } else {
1001 /* Fail a mount if the logbuf is larger than 32K */
1002 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1003 xfs_warn(mp,
1004 "logbuf size for version 1 logs must be 16K or 32K");
1005 return -EINVAL;
1006 }
1007 }
1008
1009 /*
1010 * V5 filesystems always use attr2 format for attributes.
1011 */
1012 if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
1013 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1014 "attr2 is always enabled for V5 filesystems.");
1015 return -EINVAL;
1016 }
1017
1018 /*
1019 * prohibit r/w mounts of read-only filesystems
1020 */
1021 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
1022 xfs_warn(mp,
1023 "cannot mount a read-only filesystem as read-write");
1024 return -EROFS;
1025 }
1026
1027 if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
1028 (mp->m_qflags & XFS_PQUOTA_ACCT) &&
1029 !xfs_has_pquotino(mp)) {
1030 xfs_warn(mp,
1031 "Super block does not support project and group quota together");
1032 return -EINVAL;
1033 }
1034
1035 return 0;
1036}
1037
1038static int
1039xfs_init_percpu_counters(
1040 struct xfs_mount *mp)
1041{
1042 int error;
1043
1044 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1045 if (error)
1046 return -ENOMEM;
1047
1048 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1049 if (error)
1050 goto free_icount;
1051
1052 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1053 if (error)
1054 goto free_ifree;
1055
1056 error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1057 if (error)
1058 goto free_fdblocks;
1059
1060 error = percpu_counter_init(&mp->m_delalloc_rtextents, 0, GFP_KERNEL);
1061 if (error)
1062 goto free_delalloc;
1063
1064 error = percpu_counter_init(&mp->m_frextents, 0, GFP_KERNEL);
1065 if (error)
1066 goto free_delalloc_rt;
1067
1068 return 0;
1069
1070free_delalloc_rt:
1071 percpu_counter_destroy(&mp->m_delalloc_rtextents);
1072free_delalloc:
1073 percpu_counter_destroy(&mp->m_delalloc_blks);
1074free_fdblocks:
1075 percpu_counter_destroy(&mp->m_fdblocks);
1076free_ifree:
1077 percpu_counter_destroy(&mp->m_ifree);
1078free_icount:
1079 percpu_counter_destroy(&mp->m_icount);
1080 return -ENOMEM;
1081}
1082
1083void
1084xfs_reinit_percpu_counters(
1085 struct xfs_mount *mp)
1086{
1087 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1088 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1089 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1090 percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1091}
1092
1093static void
1094xfs_destroy_percpu_counters(
1095 struct xfs_mount *mp)
1096{
1097 percpu_counter_destroy(&mp->m_icount);
1098 percpu_counter_destroy(&mp->m_ifree);
1099 percpu_counter_destroy(&mp->m_fdblocks);
1100 ASSERT(xfs_is_shutdown(mp) ||
1101 percpu_counter_sum(&mp->m_delalloc_rtextents) == 0);
1102 percpu_counter_destroy(&mp->m_delalloc_rtextents);
1103 ASSERT(xfs_is_shutdown(mp) ||
1104 percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1105 percpu_counter_destroy(&mp->m_delalloc_blks);
1106 percpu_counter_destroy(&mp->m_frextents);
1107}
1108
1109static int
1110xfs_inodegc_init_percpu(
1111 struct xfs_mount *mp)
1112{
1113 struct xfs_inodegc *gc;
1114 int cpu;
1115
1116 mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
1117 if (!mp->m_inodegc)
1118 return -ENOMEM;
1119
1120 for_each_possible_cpu(cpu) {
1121 gc = per_cpu_ptr(mp->m_inodegc, cpu);
1122 gc->cpu = cpu;
1123 gc->mp = mp;
1124 init_llist_head(&gc->list);
1125 gc->items = 0;
1126 gc->error = 0;
1127 INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
1128 }
1129 return 0;
1130}
1131
1132static void
1133xfs_inodegc_free_percpu(
1134 struct xfs_mount *mp)
1135{
1136 if (!mp->m_inodegc)
1137 return;
1138 free_percpu(mp->m_inodegc);
1139}
1140
1141static void
1142xfs_fs_put_super(
1143 struct super_block *sb)
1144{
1145 struct xfs_mount *mp = XFS_M(sb);
1146
1147 xfs_notice(mp, "Unmounting Filesystem %pU", &mp->m_sb.sb_uuid);
1148 xfs_filestream_unmount(mp);
1149 xfs_unmountfs(mp);
1150
1151 xfs_rtmount_freesb(mp);
1152 xfs_freesb(mp);
1153 xchk_mount_stats_free(mp);
1154 free_percpu(mp->m_stats.xs_stats);
1155 xfs_inodegc_free_percpu(mp);
1156 xfs_destroy_percpu_counters(mp);
1157 xfs_destroy_mount_workqueues(mp);
1158 xfs_shutdown_devices(mp);
1159}
1160
1161static long
1162xfs_fs_nr_cached_objects(
1163 struct super_block *sb,
1164 struct shrink_control *sc)
1165{
1166 /* Paranoia: catch incorrect calls during mount setup or teardown */
1167 if (WARN_ON_ONCE(!sb->s_fs_info))
1168 return 0;
1169 return xfs_reclaim_inodes_count(XFS_M(sb));
1170}
1171
1172static long
1173xfs_fs_free_cached_objects(
1174 struct super_block *sb,
1175 struct shrink_control *sc)
1176{
1177 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1178}
1179
1180static void
1181xfs_fs_shutdown(
1182 struct super_block *sb)
1183{
1184 xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REMOVED);
1185}
1186
1187static const struct super_operations xfs_super_operations = {
1188 .alloc_inode = xfs_fs_alloc_inode,
1189 .destroy_inode = xfs_fs_destroy_inode,
1190 .dirty_inode = xfs_fs_dirty_inode,
1191 .drop_inode = xfs_fs_drop_inode,
1192 .put_super = xfs_fs_put_super,
1193 .sync_fs = xfs_fs_sync_fs,
1194 .freeze_fs = xfs_fs_freeze,
1195 .unfreeze_fs = xfs_fs_unfreeze,
1196 .statfs = xfs_fs_statfs,
1197 .show_options = xfs_fs_show_options,
1198 .nr_cached_objects = xfs_fs_nr_cached_objects,
1199 .free_cached_objects = xfs_fs_free_cached_objects,
1200 .shutdown = xfs_fs_shutdown,
1201};
1202
1203static int
1204suffix_kstrtoint(
1205 const char *s,
1206 unsigned int base,
1207 int *res)
1208{
1209 int last, shift_left_factor = 0, _res;
1210 char *value;
1211 int ret = 0;
1212
1213 value = kstrdup(s, GFP_KERNEL);
1214 if (!value)
1215 return -ENOMEM;
1216
1217 last = strlen(value) - 1;
1218 if (value[last] == 'K' || value[last] == 'k') {
1219 shift_left_factor = 10;
1220 value[last] = '\0';
1221 }
1222 if (value[last] == 'M' || value[last] == 'm') {
1223 shift_left_factor = 20;
1224 value[last] = '\0';
1225 }
1226 if (value[last] == 'G' || value[last] == 'g') {
1227 shift_left_factor = 30;
1228 value[last] = '\0';
1229 }
1230
1231 if (kstrtoint(value, base, &_res))
1232 ret = -EINVAL;
1233 kfree(value);
1234 *res = _res << shift_left_factor;
1235 return ret;
1236}
1237
1238static inline void
1239xfs_fs_warn_deprecated(
1240 struct fs_context *fc,
1241 struct fs_parameter *param,
1242 uint64_t flag,
1243 bool value)
1244{
1245 /* Don't print the warning if reconfiguring and current mount point
1246 * already had the flag set
1247 */
1248 if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1249 !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
1250 return;
1251 xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1252}
1253
1254/*
1255 * Set mount state from a mount option.
1256 *
1257 * NOTE: mp->m_super is NULL here!
1258 */
1259static int
1260xfs_fs_parse_param(
1261 struct fs_context *fc,
1262 struct fs_parameter *param)
1263{
1264 struct xfs_mount *parsing_mp = fc->s_fs_info;
1265 struct fs_parse_result result;
1266 int size = 0;
1267 int opt;
1268
1269 BUILD_BUG_ON(XFS_QFLAGS_MNTOPTS & XFS_MOUNT_QUOTA_ALL);
1270
1271 opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1272 if (opt < 0)
1273 return opt;
1274
1275 switch (opt) {
1276 case Opt_logbufs:
1277 parsing_mp->m_logbufs = result.uint_32;
1278 return 0;
1279 case Opt_logbsize:
1280 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1281 return -EINVAL;
1282 return 0;
1283 case Opt_logdev:
1284 kfree(parsing_mp->m_logname);
1285 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1286 if (!parsing_mp->m_logname)
1287 return -ENOMEM;
1288 return 0;
1289 case Opt_rtdev:
1290 kfree(parsing_mp->m_rtname);
1291 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1292 if (!parsing_mp->m_rtname)
1293 return -ENOMEM;
1294 return 0;
1295 case Opt_allocsize:
1296 if (suffix_kstrtoint(param->string, 10, &size))
1297 return -EINVAL;
1298 parsing_mp->m_allocsize_log = ffs(size) - 1;
1299 parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
1300 return 0;
1301 case Opt_grpid:
1302 case Opt_bsdgroups:
1303 parsing_mp->m_features |= XFS_FEAT_GRPID;
1304 return 0;
1305 case Opt_nogrpid:
1306 case Opt_sysvgroups:
1307 parsing_mp->m_features &= ~XFS_FEAT_GRPID;
1308 return 0;
1309 case Opt_wsync:
1310 parsing_mp->m_features |= XFS_FEAT_WSYNC;
1311 return 0;
1312 case Opt_norecovery:
1313 parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
1314 return 0;
1315 case Opt_noalign:
1316 parsing_mp->m_features |= XFS_FEAT_NOALIGN;
1317 return 0;
1318 case Opt_swalloc:
1319 parsing_mp->m_features |= XFS_FEAT_SWALLOC;
1320 return 0;
1321 case Opt_sunit:
1322 parsing_mp->m_dalign = result.uint_32;
1323 return 0;
1324 case Opt_swidth:
1325 parsing_mp->m_swidth = result.uint_32;
1326 return 0;
1327 case Opt_inode32:
1328 parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
1329 return 0;
1330 case Opt_inode64:
1331 parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1332 return 0;
1333 case Opt_nouuid:
1334 parsing_mp->m_features |= XFS_FEAT_NOUUID;
1335 return 0;
1336 case Opt_largeio:
1337 parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
1338 return 0;
1339 case Opt_nolargeio:
1340 parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
1341 return 0;
1342 case Opt_filestreams:
1343 parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
1344 return 0;
1345 case Opt_noquota:
1346 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1347 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1348 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1349 return 0;
1350 case Opt_quota:
1351 case Opt_uquota:
1352 case Opt_usrquota:
1353 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
1354 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1355 return 0;
1356 case Opt_qnoenforce:
1357 case Opt_uqnoenforce:
1358 parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
1359 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1360 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1361 return 0;
1362 case Opt_pquota:
1363 case Opt_prjquota:
1364 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
1365 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1366 return 0;
1367 case Opt_pqnoenforce:
1368 parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
1369 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1370 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1371 return 0;
1372 case Opt_gquota:
1373 case Opt_grpquota:
1374 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
1375 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1376 return 0;
1377 case Opt_gqnoenforce:
1378 parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
1379 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1380 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1381 return 0;
1382 case Opt_discard:
1383 parsing_mp->m_features |= XFS_FEAT_DISCARD;
1384 return 0;
1385 case Opt_nodiscard:
1386 parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
1387 return 0;
1388#ifdef CONFIG_FS_DAX
1389 case Opt_dax:
1390 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1391 return 0;
1392 case Opt_dax_enum:
1393 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1394 return 0;
1395#endif
1396 /* Following mount options will be removed in September 2025 */
1397 case Opt_ikeep:
1398 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
1399 parsing_mp->m_features |= XFS_FEAT_IKEEP;
1400 return 0;
1401 case Opt_noikeep:
1402 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, false);
1403 parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
1404 return 0;
1405 case Opt_attr2:
1406 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, true);
1407 parsing_mp->m_features |= XFS_FEAT_ATTR2;
1408 return 0;
1409 case Opt_noattr2:
1410 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
1411 parsing_mp->m_features |= XFS_FEAT_NOATTR2;
1412 return 0;
1413 default:
1414 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1415 return -EINVAL;
1416 }
1417
1418 return 0;
1419}
1420
1421static int
1422xfs_fs_validate_params(
1423 struct xfs_mount *mp)
1424{
1425 /* No recovery flag requires a read-only mount */
1426 if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
1427 xfs_warn(mp, "no-recovery mounts must be read-only.");
1428 return -EINVAL;
1429 }
1430
1431 /*
1432 * We have not read the superblock at this point, so only the attr2
1433 * mount option can set the attr2 feature by this stage.
1434 */
1435 if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
1436 xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
1437 return -EINVAL;
1438 }
1439
1440
1441 if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
1442 xfs_warn(mp,
1443 "sunit and swidth options incompatible with the noalign option");
1444 return -EINVAL;
1445 }
1446
1447 if (!IS_ENABLED(CONFIG_XFS_QUOTA) &&
1448 (mp->m_qflags & ~XFS_QFLAGS_MNTOPTS)) {
1449 xfs_warn(mp, "quota support not available in this kernel.");
1450 return -EINVAL;
1451 }
1452
1453 if ((mp->m_dalign && !mp->m_swidth) ||
1454 (!mp->m_dalign && mp->m_swidth)) {
1455 xfs_warn(mp, "sunit and swidth must be specified together");
1456 return -EINVAL;
1457 }
1458
1459 if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1460 xfs_warn(mp,
1461 "stripe width (%d) must be a multiple of the stripe unit (%d)",
1462 mp->m_swidth, mp->m_dalign);
1463 return -EINVAL;
1464 }
1465
1466 if (mp->m_logbufs != -1 &&
1467 mp->m_logbufs != 0 &&
1468 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1469 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1470 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1471 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1472 return -EINVAL;
1473 }
1474
1475 if (mp->m_logbsize != -1 &&
1476 mp->m_logbsize != 0 &&
1477 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1478 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1479 !is_power_of_2(mp->m_logbsize))) {
1480 xfs_warn(mp,
1481 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1482 mp->m_logbsize);
1483 return -EINVAL;
1484 }
1485
1486 if (xfs_has_allocsize(mp) &&
1487 (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1488 mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1489 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1490 mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1491 return -EINVAL;
1492 }
1493
1494 return 0;
1495}
1496
1497struct dentry *
1498xfs_debugfs_mkdir(
1499 const char *name,
1500 struct dentry *parent)
1501{
1502 struct dentry *child;
1503
1504 /* Apparently we're expected to ignore error returns?? */
1505 child = debugfs_create_dir(name, parent);
1506 if (IS_ERR(child))
1507 return NULL;
1508
1509 return child;
1510}
1511
1512static int
1513xfs_fs_fill_super(
1514 struct super_block *sb,
1515 struct fs_context *fc)
1516{
1517 struct xfs_mount *mp = sb->s_fs_info;
1518 struct inode *root;
1519 int flags = 0, error;
1520
1521 mp->m_super = sb;
1522
1523 /*
1524 * Copy VFS mount flags from the context now that all parameter parsing
1525 * is guaranteed to have been completed by either the old mount API or
1526 * the newer fsopen/fsconfig API.
1527 */
1528 if (fc->sb_flags & SB_RDONLY)
1529 xfs_set_readonly(mp);
1530 if (fc->sb_flags & SB_DIRSYNC)
1531 mp->m_features |= XFS_FEAT_DIRSYNC;
1532 if (fc->sb_flags & SB_SYNCHRONOUS)
1533 mp->m_features |= XFS_FEAT_WSYNC;
1534
1535 error = xfs_fs_validate_params(mp);
1536 if (error)
1537 return error;
1538
1539 sb_min_blocksize(sb, BBSIZE);
1540 sb->s_xattr = xfs_xattr_handlers;
1541 sb->s_export_op = &xfs_export_operations;
1542#ifdef CONFIG_XFS_QUOTA
1543 sb->s_qcop = &xfs_quotactl_operations;
1544 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1545#endif
1546 sb->s_op = &xfs_super_operations;
1547
1548 /*
1549 * Delay mount work if the debug hook is set. This is debug
1550 * instrumention to coordinate simulation of xfs mount failures with
1551 * VFS superblock operations
1552 */
1553 if (xfs_globals.mount_delay) {
1554 xfs_notice(mp, "Delaying mount for %d seconds.",
1555 xfs_globals.mount_delay);
1556 msleep(xfs_globals.mount_delay * 1000);
1557 }
1558
1559 if (fc->sb_flags & SB_SILENT)
1560 flags |= XFS_MFSI_QUIET;
1561
1562 error = xfs_open_devices(mp);
1563 if (error)
1564 return error;
1565
1566 if (xfs_debugfs) {
1567 mp->m_debugfs = xfs_debugfs_mkdir(mp->m_super->s_id,
1568 xfs_debugfs);
1569 } else {
1570 mp->m_debugfs = NULL;
1571 }
1572
1573 error = xfs_init_mount_workqueues(mp);
1574 if (error)
1575 goto out_shutdown_devices;
1576
1577 error = xfs_init_percpu_counters(mp);
1578 if (error)
1579 goto out_destroy_workqueues;
1580
1581 error = xfs_inodegc_init_percpu(mp);
1582 if (error)
1583 goto out_destroy_counters;
1584
1585 /* Allocate stats memory before we do operations that might use it */
1586 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1587 if (!mp->m_stats.xs_stats) {
1588 error = -ENOMEM;
1589 goto out_destroy_inodegc;
1590 }
1591
1592 error = xchk_mount_stats_alloc(mp);
1593 if (error)
1594 goto out_free_stats;
1595
1596 error = xfs_readsb(mp, flags);
1597 if (error)
1598 goto out_free_scrub_stats;
1599
1600 error = xfs_finish_flags(mp);
1601 if (error)
1602 goto out_free_sb;
1603
1604 error = xfs_setup_devices(mp);
1605 if (error)
1606 goto out_free_sb;
1607
1608 /*
1609 * V4 support is undergoing deprecation.
1610 *
1611 * Note: this has to use an open coded m_features check as xfs_has_crc
1612 * always returns false for !CONFIG_XFS_SUPPORT_V4.
1613 */
1614 if (!(mp->m_features & XFS_FEAT_CRC)) {
1615 if (!IS_ENABLED(CONFIG_XFS_SUPPORT_V4)) {
1616 xfs_warn(mp,
1617 "Deprecated V4 format (crc=0) not supported by kernel.");
1618 error = -EINVAL;
1619 goto out_free_sb;
1620 }
1621 xfs_warn_once(mp,
1622 "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1623 }
1624
1625 /* ASCII case insensitivity is undergoing deprecation. */
1626 if (xfs_has_asciici(mp)) {
1627#ifdef CONFIG_XFS_SUPPORT_ASCII_CI
1628 xfs_warn_once(mp,
1629 "Deprecated ASCII case-insensitivity feature (ascii-ci=1) will not be supported after September 2030.");
1630#else
1631 xfs_warn(mp,
1632 "Deprecated ASCII case-insensitivity feature (ascii-ci=1) not supported by kernel.");
1633 error = -EINVAL;
1634 goto out_free_sb;
1635#endif
1636 }
1637
1638 /* Filesystem claims it needs repair, so refuse the mount. */
1639 if (xfs_has_needsrepair(mp)) {
1640 xfs_warn(mp, "Filesystem needs repair. Please run xfs_repair.");
1641 error = -EFSCORRUPTED;
1642 goto out_free_sb;
1643 }
1644
1645 /*
1646 * Don't touch the filesystem if a user tool thinks it owns the primary
1647 * superblock. mkfs doesn't clear the flag from secondary supers, so
1648 * we don't check them at all.
1649 */
1650 if (mp->m_sb.sb_inprogress) {
1651 xfs_warn(mp, "Offline file system operation in progress!");
1652 error = -EFSCORRUPTED;
1653 goto out_free_sb;
1654 }
1655
1656 if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1657 size_t max_folio_size = mapping_max_folio_size_supported();
1658
1659 if (!xfs_has_crc(mp)) {
1660 xfs_warn(mp,
1661"V4 Filesystem with blocksize %d bytes. Only pagesize (%ld) or less is supported.",
1662 mp->m_sb.sb_blocksize, PAGE_SIZE);
1663 error = -ENOSYS;
1664 goto out_free_sb;
1665 }
1666
1667 if (mp->m_sb.sb_blocksize > max_folio_size) {
1668 xfs_warn(mp,
1669"block size (%u bytes) not supported; Only block size (%zu) or less is supported",
1670 mp->m_sb.sb_blocksize, max_folio_size);
1671 error = -ENOSYS;
1672 goto out_free_sb;
1673 }
1674
1675 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_LBS);
1676 }
1677
1678 /* Ensure this filesystem fits in the page cache limits */
1679 if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1680 xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1681 xfs_warn(mp,
1682 "file system too large to be mounted on this system.");
1683 error = -EFBIG;
1684 goto out_free_sb;
1685 }
1686
1687 /*
1688 * XFS block mappings use 54 bits to store the logical block offset.
1689 * This should suffice to handle the maximum file size that the VFS
1690 * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1691 * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1692 * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1693 * to check this assertion.
1694 *
1695 * Avoid integer overflow by comparing the maximum bmbt offset to the
1696 * maximum pagecache offset in units of fs blocks.
1697 */
1698 if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1699 xfs_warn(mp,
1700"MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1701 XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1702 XFS_MAX_FILEOFF);
1703 error = -EINVAL;
1704 goto out_free_sb;
1705 }
1706
1707 error = xfs_rtmount_readsb(mp);
1708 if (error)
1709 goto out_free_sb;
1710
1711 error = xfs_filestream_mount(mp);
1712 if (error)
1713 goto out_free_rtsb;
1714
1715 /*
1716 * we must configure the block size in the superblock before we run the
1717 * full mount process as the mount process can lookup and cache inodes.
1718 */
1719 sb->s_magic = XFS_SUPER_MAGIC;
1720 sb->s_blocksize = mp->m_sb.sb_blocksize;
1721 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1722 sb->s_maxbytes = MAX_LFS_FILESIZE;
1723 sb->s_max_links = XFS_MAXLINK;
1724 sb->s_time_gran = 1;
1725 if (xfs_has_bigtime(mp)) {
1726 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1727 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1728 } else {
1729 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1730 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1731 }
1732 trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1733 sb->s_iflags |= SB_I_CGROUPWB;
1734
1735 set_posix_acl_flag(sb);
1736
1737 /* version 5 superblocks support inode version counters. */
1738 if (xfs_has_crc(mp))
1739 sb->s_flags |= SB_I_VERSION;
1740
1741 if (xfs_has_dax_always(mp)) {
1742 error = xfs_setup_dax_always(mp);
1743 if (error)
1744 goto out_filestream_unmount;
1745 }
1746
1747 if (xfs_has_discard(mp) && !bdev_max_discard_sectors(sb->s_bdev)) {
1748 xfs_warn(mp,
1749 "mounting with \"discard\" option, but the device does not support discard");
1750 mp->m_features &= ~XFS_FEAT_DISCARD;
1751 }
1752
1753 if (xfs_has_metadir(mp))
1754 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_METADIR);
1755
1756 if (xfs_has_reflink(mp)) {
1757 if (mp->m_sb.sb_rblocks) {
1758 xfs_alert(mp,
1759 "reflink not compatible with realtime device!");
1760 error = -EINVAL;
1761 goto out_filestream_unmount;
1762 }
1763
1764 if (xfs_globals.always_cow) {
1765 xfs_info(mp, "using DEBUG-only always_cow mode.");
1766 mp->m_always_cow = true;
1767 }
1768 }
1769
1770 if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
1771 xfs_alert(mp,
1772 "reverse mapping btree not compatible with realtime device!");
1773 error = -EINVAL;
1774 goto out_filestream_unmount;
1775 }
1776
1777 if (xfs_has_exchange_range(mp))
1778 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_EXCHRANGE);
1779
1780 if (xfs_has_parent(mp))
1781 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_PPTR);
1782
1783 /*
1784 * If no quota mount options were provided, maybe we'll try to pick
1785 * up the quota accounting and enforcement flags from the ondisk sb.
1786 */
1787 if (!(mp->m_qflags & XFS_QFLAGS_MNTOPTS))
1788 xfs_set_resuming_quotaon(mp);
1789 mp->m_qflags &= ~XFS_QFLAGS_MNTOPTS;
1790
1791 error = xfs_mountfs(mp);
1792 if (error)
1793 goto out_filestream_unmount;
1794
1795 root = igrab(VFS_I(mp->m_rootip));
1796 if (!root) {
1797 error = -ENOENT;
1798 goto out_unmount;
1799 }
1800 sb->s_root = d_make_root(root);
1801 if (!sb->s_root) {
1802 error = -ENOMEM;
1803 goto out_unmount;
1804 }
1805
1806 return 0;
1807
1808 out_filestream_unmount:
1809 xfs_filestream_unmount(mp);
1810 out_free_rtsb:
1811 xfs_rtmount_freesb(mp);
1812 out_free_sb:
1813 xfs_freesb(mp);
1814 out_free_scrub_stats:
1815 xchk_mount_stats_free(mp);
1816 out_free_stats:
1817 free_percpu(mp->m_stats.xs_stats);
1818 out_destroy_inodegc:
1819 xfs_inodegc_free_percpu(mp);
1820 out_destroy_counters:
1821 xfs_destroy_percpu_counters(mp);
1822 out_destroy_workqueues:
1823 xfs_destroy_mount_workqueues(mp);
1824 out_shutdown_devices:
1825 xfs_shutdown_devices(mp);
1826 return error;
1827
1828 out_unmount:
1829 xfs_filestream_unmount(mp);
1830 xfs_unmountfs(mp);
1831 goto out_free_rtsb;
1832}
1833
1834static int
1835xfs_fs_get_tree(
1836 struct fs_context *fc)
1837{
1838 return get_tree_bdev(fc, xfs_fs_fill_super);
1839}
1840
1841static int
1842xfs_remount_rw(
1843 struct xfs_mount *mp)
1844{
1845 struct xfs_sb *sbp = &mp->m_sb;
1846 int error;
1847
1848 if (xfs_has_norecovery(mp)) {
1849 xfs_warn(mp,
1850 "ro->rw transition prohibited on norecovery mount");
1851 return -EINVAL;
1852 }
1853
1854 if (xfs_sb_is_v5(sbp) &&
1855 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1856 xfs_warn(mp,
1857 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1858 (sbp->sb_features_ro_compat &
1859 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1860 return -EINVAL;
1861 }
1862
1863 xfs_clear_readonly(mp);
1864
1865 /*
1866 * If this is the first remount to writeable state we might have some
1867 * superblock changes to update.
1868 */
1869 if (mp->m_update_sb) {
1870 error = xfs_sync_sb(mp, false);
1871 if (error) {
1872 xfs_warn(mp, "failed to write sb changes");
1873 return error;
1874 }
1875 mp->m_update_sb = false;
1876 }
1877
1878 /*
1879 * Fill out the reserve pool if it is empty. Use the stashed value if
1880 * it is non-zero, otherwise go with the default.
1881 */
1882 xfs_restore_resvblks(mp);
1883 xfs_log_work_queue(mp);
1884 xfs_blockgc_start(mp);
1885
1886 /* Create the per-AG metadata reservation pool .*/
1887 error = xfs_fs_reserve_ag_blocks(mp);
1888 if (error && error != -ENOSPC)
1889 return error;
1890
1891 /* Re-enable the background inode inactivation worker. */
1892 xfs_inodegc_start(mp);
1893
1894 return 0;
1895}
1896
1897static int
1898xfs_remount_ro(
1899 struct xfs_mount *mp)
1900{
1901 struct xfs_icwalk icw = {
1902 .icw_flags = XFS_ICWALK_FLAG_SYNC,
1903 };
1904 int error;
1905
1906 /* Flush all the dirty data to disk. */
1907 error = sync_filesystem(mp->m_super);
1908 if (error)
1909 return error;
1910
1911 /*
1912 * Cancel background eofb scanning so it cannot race with the final
1913 * log force+buftarg wait and deadlock the remount.
1914 */
1915 xfs_blockgc_stop(mp);
1916
1917 /*
1918 * Clear out all remaining COW staging extents and speculative post-EOF
1919 * preallocations so that we don't leave inodes requiring inactivation
1920 * cleanups during reclaim on a read-only mount. We must process every
1921 * cached inode, so this requires a synchronous cache scan.
1922 */
1923 error = xfs_blockgc_free_space(mp, &icw);
1924 if (error) {
1925 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1926 return error;
1927 }
1928
1929 /*
1930 * Stop the inodegc background worker. xfs_fs_reconfigure already
1931 * flushed all pending inodegc work when it sync'd the filesystem.
1932 * The VFS holds s_umount, so we know that inodes cannot enter
1933 * xfs_fs_destroy_inode during a remount operation. In readonly mode
1934 * we send inodes straight to reclaim, so no inodes will be queued.
1935 */
1936 xfs_inodegc_stop(mp);
1937
1938 /* Free the per-AG metadata reservation pool. */
1939 xfs_fs_unreserve_ag_blocks(mp);
1940
1941 /*
1942 * Before we sync the metadata, we need to free up the reserve block
1943 * pool so that the used block count in the superblock on disk is
1944 * correct at the end of the remount. Stash the current* reserve pool
1945 * size so that if we get remounted rw, we can return it to the same
1946 * size.
1947 */
1948 xfs_save_resvblks(mp);
1949
1950 xfs_log_clean(mp);
1951 xfs_set_readonly(mp);
1952
1953 return 0;
1954}
1955
1956/*
1957 * Logically we would return an error here to prevent users from believing
1958 * they might have changed mount options using remount which can't be changed.
1959 *
1960 * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1961 * arguments in some cases so we can't blindly reject options, but have to
1962 * check for each specified option if it actually differs from the currently
1963 * set option and only reject it if that's the case.
1964 *
1965 * Until that is implemented we return success for every remount request, and
1966 * silently ignore all options that we can't actually change.
1967 */
1968static int
1969xfs_fs_reconfigure(
1970 struct fs_context *fc)
1971{
1972 struct xfs_mount *mp = XFS_M(fc->root->d_sb);
1973 struct xfs_mount *new_mp = fc->s_fs_info;
1974 int flags = fc->sb_flags;
1975 int error;
1976
1977 new_mp->m_qflags &= ~XFS_QFLAGS_MNTOPTS;
1978
1979 /* version 5 superblocks always support version counters. */
1980 if (xfs_has_crc(mp))
1981 fc->sb_flags |= SB_I_VERSION;
1982
1983 error = xfs_fs_validate_params(new_mp);
1984 if (error)
1985 return error;
1986
1987 /* inode32 -> inode64 */
1988 if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
1989 mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1990 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1991 }
1992
1993 /* inode64 -> inode32 */
1994 if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) {
1995 mp->m_features |= XFS_FEAT_SMALL_INUMS;
1996 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1997 }
1998
1999 /* ro -> rw */
2000 if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
2001 error = xfs_remount_rw(mp);
2002 if (error)
2003 return error;
2004 }
2005
2006 /* rw -> ro */
2007 if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
2008 error = xfs_remount_ro(mp);
2009 if (error)
2010 return error;
2011 }
2012
2013 return 0;
2014}
2015
2016static void
2017xfs_fs_free(
2018 struct fs_context *fc)
2019{
2020 struct xfs_mount *mp = fc->s_fs_info;
2021
2022 /*
2023 * mp is stored in the fs_context when it is initialized.
2024 * mp is transferred to the superblock on a successful mount,
2025 * but if an error occurs before the transfer we have to free
2026 * it here.
2027 */
2028 if (mp)
2029 xfs_mount_free(mp);
2030}
2031
2032static const struct fs_context_operations xfs_context_ops = {
2033 .parse_param = xfs_fs_parse_param,
2034 .get_tree = xfs_fs_get_tree,
2035 .reconfigure = xfs_fs_reconfigure,
2036 .free = xfs_fs_free,
2037};
2038
2039/*
2040 * WARNING: do not initialise any parameters in this function that depend on
2041 * mount option parsing having already been performed as this can be called from
2042 * fsopen() before any parameters have been set.
2043 */
2044static int
2045xfs_init_fs_context(
2046 struct fs_context *fc)
2047{
2048 struct xfs_mount *mp;
2049 int i;
2050
2051 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL | __GFP_NOFAIL);
2052 if (!mp)
2053 return -ENOMEM;
2054
2055 spin_lock_init(&mp->m_sb_lock);
2056 for (i = 0; i < XG_TYPE_MAX; i++)
2057 xa_init(&mp->m_groups[i].xa);
2058 mutex_init(&mp->m_growlock);
2059 INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
2060 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
2061 mp->m_kobj.kobject.kset = xfs_kset;
2062 /*
2063 * We don't create the finobt per-ag space reservation until after log
2064 * recovery, so we must set this to true so that an ifree transaction
2065 * started during log recovery will not depend on space reservations
2066 * for finobt expansion.
2067 */
2068 mp->m_finobt_nores = true;
2069
2070 /*
2071 * These can be overridden by the mount option parsing.
2072 */
2073 mp->m_logbufs = -1;
2074 mp->m_logbsize = -1;
2075 mp->m_allocsize_log = 16; /* 64k */
2076
2077 xfs_hooks_init(&mp->m_dir_update_hooks);
2078
2079 fc->s_fs_info = mp;
2080 fc->ops = &xfs_context_ops;
2081
2082 return 0;
2083}
2084
2085static void
2086xfs_kill_sb(
2087 struct super_block *sb)
2088{
2089 kill_block_super(sb);
2090 xfs_mount_free(XFS_M(sb));
2091}
2092
2093static struct file_system_type xfs_fs_type = {
2094 .owner = THIS_MODULE,
2095 .name = "xfs",
2096 .init_fs_context = xfs_init_fs_context,
2097 .parameters = xfs_fs_parameters,
2098 .kill_sb = xfs_kill_sb,
2099 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME,
2100};
2101MODULE_ALIAS_FS("xfs");
2102
2103STATIC int __init
2104xfs_init_caches(void)
2105{
2106 int error;
2107
2108 xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
2109 SLAB_HWCACHE_ALIGN |
2110 SLAB_RECLAIM_ACCOUNT,
2111 NULL);
2112 if (!xfs_buf_cache)
2113 goto out;
2114
2115 xfs_log_ticket_cache = kmem_cache_create("xfs_log_ticket",
2116 sizeof(struct xlog_ticket),
2117 0, 0, NULL);
2118 if (!xfs_log_ticket_cache)
2119 goto out_destroy_buf_cache;
2120
2121 error = xfs_btree_init_cur_caches();
2122 if (error)
2123 goto out_destroy_log_ticket_cache;
2124
2125 error = rcbagbt_init_cur_cache();
2126 if (error)
2127 goto out_destroy_btree_cur_cache;
2128
2129 error = xfs_defer_init_item_caches();
2130 if (error)
2131 goto out_destroy_rcbagbt_cur_cache;
2132
2133 xfs_da_state_cache = kmem_cache_create("xfs_da_state",
2134 sizeof(struct xfs_da_state),
2135 0, 0, NULL);
2136 if (!xfs_da_state_cache)
2137 goto out_destroy_defer_item_cache;
2138
2139 xfs_ifork_cache = kmem_cache_create("xfs_ifork",
2140 sizeof(struct xfs_ifork),
2141 0, 0, NULL);
2142 if (!xfs_ifork_cache)
2143 goto out_destroy_da_state_cache;
2144
2145 xfs_trans_cache = kmem_cache_create("xfs_trans",
2146 sizeof(struct xfs_trans),
2147 0, 0, NULL);
2148 if (!xfs_trans_cache)
2149 goto out_destroy_ifork_cache;
2150
2151
2152 /*
2153 * The size of the cache-allocated buf log item is the maximum
2154 * size possible under XFS. This wastes a little bit of memory,
2155 * but it is much faster.
2156 */
2157 xfs_buf_item_cache = kmem_cache_create("xfs_buf_item",
2158 sizeof(struct xfs_buf_log_item),
2159 0, 0, NULL);
2160 if (!xfs_buf_item_cache)
2161 goto out_destroy_trans_cache;
2162
2163 xfs_efd_cache = kmem_cache_create("xfs_efd_item",
2164 xfs_efd_log_item_sizeof(XFS_EFD_MAX_FAST_EXTENTS),
2165 0, 0, NULL);
2166 if (!xfs_efd_cache)
2167 goto out_destroy_buf_item_cache;
2168
2169 xfs_efi_cache = kmem_cache_create("xfs_efi_item",
2170 xfs_efi_log_item_sizeof(XFS_EFI_MAX_FAST_EXTENTS),
2171 0, 0, NULL);
2172 if (!xfs_efi_cache)
2173 goto out_destroy_efd_cache;
2174
2175 xfs_inode_cache = kmem_cache_create("xfs_inode",
2176 sizeof(struct xfs_inode), 0,
2177 (SLAB_HWCACHE_ALIGN |
2178 SLAB_RECLAIM_ACCOUNT |
2179 SLAB_ACCOUNT),
2180 xfs_fs_inode_init_once);
2181 if (!xfs_inode_cache)
2182 goto out_destroy_efi_cache;
2183
2184 xfs_ili_cache = kmem_cache_create("xfs_ili",
2185 sizeof(struct xfs_inode_log_item), 0,
2186 SLAB_RECLAIM_ACCOUNT,
2187 NULL);
2188 if (!xfs_ili_cache)
2189 goto out_destroy_inode_cache;
2190
2191 xfs_icreate_cache = kmem_cache_create("xfs_icr",
2192 sizeof(struct xfs_icreate_item),
2193 0, 0, NULL);
2194 if (!xfs_icreate_cache)
2195 goto out_destroy_ili_cache;
2196
2197 xfs_rud_cache = kmem_cache_create("xfs_rud_item",
2198 sizeof(struct xfs_rud_log_item),
2199 0, 0, NULL);
2200 if (!xfs_rud_cache)
2201 goto out_destroy_icreate_cache;
2202
2203 xfs_rui_cache = kmem_cache_create("xfs_rui_item",
2204 xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2205 0, 0, NULL);
2206 if (!xfs_rui_cache)
2207 goto out_destroy_rud_cache;
2208
2209 xfs_cud_cache = kmem_cache_create("xfs_cud_item",
2210 sizeof(struct xfs_cud_log_item),
2211 0, 0, NULL);
2212 if (!xfs_cud_cache)
2213 goto out_destroy_rui_cache;
2214
2215 xfs_cui_cache = kmem_cache_create("xfs_cui_item",
2216 xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2217 0, 0, NULL);
2218 if (!xfs_cui_cache)
2219 goto out_destroy_cud_cache;
2220
2221 xfs_bud_cache = kmem_cache_create("xfs_bud_item",
2222 sizeof(struct xfs_bud_log_item),
2223 0, 0, NULL);
2224 if (!xfs_bud_cache)
2225 goto out_destroy_cui_cache;
2226
2227 xfs_bui_cache = kmem_cache_create("xfs_bui_item",
2228 xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2229 0, 0, NULL);
2230 if (!xfs_bui_cache)
2231 goto out_destroy_bud_cache;
2232
2233 xfs_attrd_cache = kmem_cache_create("xfs_attrd_item",
2234 sizeof(struct xfs_attrd_log_item),
2235 0, 0, NULL);
2236 if (!xfs_attrd_cache)
2237 goto out_destroy_bui_cache;
2238
2239 xfs_attri_cache = kmem_cache_create("xfs_attri_item",
2240 sizeof(struct xfs_attri_log_item),
2241 0, 0, NULL);
2242 if (!xfs_attri_cache)
2243 goto out_destroy_attrd_cache;
2244
2245 xfs_iunlink_cache = kmem_cache_create("xfs_iul_item",
2246 sizeof(struct xfs_iunlink_item),
2247 0, 0, NULL);
2248 if (!xfs_iunlink_cache)
2249 goto out_destroy_attri_cache;
2250
2251 xfs_xmd_cache = kmem_cache_create("xfs_xmd_item",
2252 sizeof(struct xfs_xmd_log_item),
2253 0, 0, NULL);
2254 if (!xfs_xmd_cache)
2255 goto out_destroy_iul_cache;
2256
2257 xfs_xmi_cache = kmem_cache_create("xfs_xmi_item",
2258 sizeof(struct xfs_xmi_log_item),
2259 0, 0, NULL);
2260 if (!xfs_xmi_cache)
2261 goto out_destroy_xmd_cache;
2262
2263 xfs_parent_args_cache = kmem_cache_create("xfs_parent_args",
2264 sizeof(struct xfs_parent_args),
2265 0, 0, NULL);
2266 if (!xfs_parent_args_cache)
2267 goto out_destroy_xmi_cache;
2268
2269 return 0;
2270
2271 out_destroy_xmi_cache:
2272 kmem_cache_destroy(xfs_xmi_cache);
2273 out_destroy_xmd_cache:
2274 kmem_cache_destroy(xfs_xmd_cache);
2275 out_destroy_iul_cache:
2276 kmem_cache_destroy(xfs_iunlink_cache);
2277 out_destroy_attri_cache:
2278 kmem_cache_destroy(xfs_attri_cache);
2279 out_destroy_attrd_cache:
2280 kmem_cache_destroy(xfs_attrd_cache);
2281 out_destroy_bui_cache:
2282 kmem_cache_destroy(xfs_bui_cache);
2283 out_destroy_bud_cache:
2284 kmem_cache_destroy(xfs_bud_cache);
2285 out_destroy_cui_cache:
2286 kmem_cache_destroy(xfs_cui_cache);
2287 out_destroy_cud_cache:
2288 kmem_cache_destroy(xfs_cud_cache);
2289 out_destroy_rui_cache:
2290 kmem_cache_destroy(xfs_rui_cache);
2291 out_destroy_rud_cache:
2292 kmem_cache_destroy(xfs_rud_cache);
2293 out_destroy_icreate_cache:
2294 kmem_cache_destroy(xfs_icreate_cache);
2295 out_destroy_ili_cache:
2296 kmem_cache_destroy(xfs_ili_cache);
2297 out_destroy_inode_cache:
2298 kmem_cache_destroy(xfs_inode_cache);
2299 out_destroy_efi_cache:
2300 kmem_cache_destroy(xfs_efi_cache);
2301 out_destroy_efd_cache:
2302 kmem_cache_destroy(xfs_efd_cache);
2303 out_destroy_buf_item_cache:
2304 kmem_cache_destroy(xfs_buf_item_cache);
2305 out_destroy_trans_cache:
2306 kmem_cache_destroy(xfs_trans_cache);
2307 out_destroy_ifork_cache:
2308 kmem_cache_destroy(xfs_ifork_cache);
2309 out_destroy_da_state_cache:
2310 kmem_cache_destroy(xfs_da_state_cache);
2311 out_destroy_defer_item_cache:
2312 xfs_defer_destroy_item_caches();
2313 out_destroy_rcbagbt_cur_cache:
2314 rcbagbt_destroy_cur_cache();
2315 out_destroy_btree_cur_cache:
2316 xfs_btree_destroy_cur_caches();
2317 out_destroy_log_ticket_cache:
2318 kmem_cache_destroy(xfs_log_ticket_cache);
2319 out_destroy_buf_cache:
2320 kmem_cache_destroy(xfs_buf_cache);
2321 out:
2322 return -ENOMEM;
2323}
2324
2325STATIC void
2326xfs_destroy_caches(void)
2327{
2328 /*
2329 * Make sure all delayed rcu free are flushed before we
2330 * destroy caches.
2331 */
2332 rcu_barrier();
2333 kmem_cache_destroy(xfs_parent_args_cache);
2334 kmem_cache_destroy(xfs_xmd_cache);
2335 kmem_cache_destroy(xfs_xmi_cache);
2336 kmem_cache_destroy(xfs_iunlink_cache);
2337 kmem_cache_destroy(xfs_attri_cache);
2338 kmem_cache_destroy(xfs_attrd_cache);
2339 kmem_cache_destroy(xfs_bui_cache);
2340 kmem_cache_destroy(xfs_bud_cache);
2341 kmem_cache_destroy(xfs_cui_cache);
2342 kmem_cache_destroy(xfs_cud_cache);
2343 kmem_cache_destroy(xfs_rui_cache);
2344 kmem_cache_destroy(xfs_rud_cache);
2345 kmem_cache_destroy(xfs_icreate_cache);
2346 kmem_cache_destroy(xfs_ili_cache);
2347 kmem_cache_destroy(xfs_inode_cache);
2348 kmem_cache_destroy(xfs_efi_cache);
2349 kmem_cache_destroy(xfs_efd_cache);
2350 kmem_cache_destroy(xfs_buf_item_cache);
2351 kmem_cache_destroy(xfs_trans_cache);
2352 kmem_cache_destroy(xfs_ifork_cache);
2353 kmem_cache_destroy(xfs_da_state_cache);
2354 xfs_defer_destroy_item_caches();
2355 rcbagbt_destroy_cur_cache();
2356 xfs_btree_destroy_cur_caches();
2357 kmem_cache_destroy(xfs_log_ticket_cache);
2358 kmem_cache_destroy(xfs_buf_cache);
2359}
2360
2361STATIC int __init
2362xfs_init_workqueues(void)
2363{
2364 /*
2365 * The allocation workqueue can be used in memory reclaim situations
2366 * (writepage path), and parallelism is only limited by the number of
2367 * AGs in all the filesystems mounted. Hence use the default large
2368 * max_active value for this workqueue.
2369 */
2370 xfs_alloc_wq = alloc_workqueue("xfsalloc",
2371 XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2372 if (!xfs_alloc_wq)
2373 return -ENOMEM;
2374
2375 xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2376 0);
2377 if (!xfs_discard_wq)
2378 goto out_free_alloc_wq;
2379
2380 return 0;
2381out_free_alloc_wq:
2382 destroy_workqueue(xfs_alloc_wq);
2383 return -ENOMEM;
2384}
2385
2386STATIC void
2387xfs_destroy_workqueues(void)
2388{
2389 destroy_workqueue(xfs_discard_wq);
2390 destroy_workqueue(xfs_alloc_wq);
2391}
2392
2393STATIC int __init
2394init_xfs_fs(void)
2395{
2396 int error;
2397
2398 xfs_check_ondisk_structs();
2399
2400 error = xfs_dahash_test();
2401 if (error)
2402 return error;
2403
2404 printk(KERN_INFO XFS_VERSION_STRING " with "
2405 XFS_BUILD_OPTIONS " enabled\n");
2406
2407 xfs_dir_startup();
2408
2409 error = xfs_init_caches();
2410 if (error)
2411 goto out;
2412
2413 error = xfs_init_workqueues();
2414 if (error)
2415 goto out_destroy_caches;
2416
2417 error = xfs_mru_cache_init();
2418 if (error)
2419 goto out_destroy_wq;
2420
2421 error = xfs_init_procfs();
2422 if (error)
2423 goto out_mru_cache_uninit;
2424
2425 error = xfs_sysctl_register();
2426 if (error)
2427 goto out_cleanup_procfs;
2428
2429 xfs_debugfs = xfs_debugfs_mkdir("xfs", NULL);
2430
2431 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2432 if (!xfs_kset) {
2433 error = -ENOMEM;
2434 goto out_debugfs_unregister;
2435 }
2436
2437 xfsstats.xs_kobj.kobject.kset = xfs_kset;
2438
2439 xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2440 if (!xfsstats.xs_stats) {
2441 error = -ENOMEM;
2442 goto out_kset_unregister;
2443 }
2444
2445 error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2446 "stats");
2447 if (error)
2448 goto out_free_stats;
2449
2450 error = xchk_global_stats_setup(xfs_debugfs);
2451 if (error)
2452 goto out_remove_stats_kobj;
2453
2454#ifdef DEBUG
2455 xfs_dbg_kobj.kobject.kset = xfs_kset;
2456 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2457 if (error)
2458 goto out_remove_scrub_stats;
2459#endif
2460
2461 error = xfs_qm_init();
2462 if (error)
2463 goto out_remove_dbg_kobj;
2464
2465 error = register_filesystem(&xfs_fs_type);
2466 if (error)
2467 goto out_qm_exit;
2468 return 0;
2469
2470 out_qm_exit:
2471 xfs_qm_exit();
2472 out_remove_dbg_kobj:
2473#ifdef DEBUG
2474 xfs_sysfs_del(&xfs_dbg_kobj);
2475 out_remove_scrub_stats:
2476#endif
2477 xchk_global_stats_teardown();
2478 out_remove_stats_kobj:
2479 xfs_sysfs_del(&xfsstats.xs_kobj);
2480 out_free_stats:
2481 free_percpu(xfsstats.xs_stats);
2482 out_kset_unregister:
2483 kset_unregister(xfs_kset);
2484 out_debugfs_unregister:
2485 debugfs_remove(xfs_debugfs);
2486 xfs_sysctl_unregister();
2487 out_cleanup_procfs:
2488 xfs_cleanup_procfs();
2489 out_mru_cache_uninit:
2490 xfs_mru_cache_uninit();
2491 out_destroy_wq:
2492 xfs_destroy_workqueues();
2493 out_destroy_caches:
2494 xfs_destroy_caches();
2495 out:
2496 return error;
2497}
2498
2499STATIC void __exit
2500exit_xfs_fs(void)
2501{
2502 xfs_qm_exit();
2503 unregister_filesystem(&xfs_fs_type);
2504#ifdef DEBUG
2505 xfs_sysfs_del(&xfs_dbg_kobj);
2506#endif
2507 xchk_global_stats_teardown();
2508 xfs_sysfs_del(&xfsstats.xs_kobj);
2509 free_percpu(xfsstats.xs_stats);
2510 kset_unregister(xfs_kset);
2511 debugfs_remove(xfs_debugfs);
2512 xfs_sysctl_unregister();
2513 xfs_cleanup_procfs();
2514 xfs_mru_cache_uninit();
2515 xfs_destroy_workqueues();
2516 xfs_destroy_caches();
2517 xfs_uuid_table_free();
2518}
2519
2520module_init(init_xfs_fs);
2521module_exit(exit_xfs_fs);
2522
2523MODULE_AUTHOR("Silicon Graphics, Inc.");
2524MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2525MODULE_LICENSE("GPL");