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
66 static const struct super_operations xfs_super_operations;
67 static kmem_zone_t *xfs_ioend_zone;
68 mempool_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 */
123 enum {
124 Opt_barrier, Opt_nobarrier, Opt_err
125 };
126
127 static const match_table_t tokens = {
128 {Opt_barrier, "barrier"},
129 {Opt_nobarrier, "nobarrier"},
130 {Opt_err, NULL}
131 };
132
133
134 STATIC unsigned long
suffix_strtoul(char * s,char ** endp,unsigned int base)135 suffix_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 */
164 STATIC int
xfs_parseargs(struct xfs_mount * mp,char * options)165 xfs_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
203 /*
204 * These can be overridden by the mount option parsing.
205 */
206 mp->m_logbufs = -1;
207 mp->m_logbsize = -1;
208
209 if (!options)
210 goto done;
211
212 while ((this_char = strsep(&options, ",")) != NULL) {
213 if (!*this_char)
214 continue;
215 if ((value = strchr(this_char, '=')) != NULL)
216 *value++ = 0;
217
218 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
219 if (!value || !*value) {
220 xfs_warn(mp, "%s option requires an argument",
221 this_char);
222 return EINVAL;
223 }
224 mp->m_logbufs = simple_strtoul(value, &eov, 10);
225 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
226 if (!value || !*value) {
227 xfs_warn(mp, "%s option requires an argument",
228 this_char);
229 return EINVAL;
230 }
231 mp->m_logbsize = suffix_strtoul(value, &eov, 10);
232 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
233 if (!value || !*value) {
234 xfs_warn(mp, "%s option requires an argument",
235 this_char);
236 return EINVAL;
237 }
238 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
239 if (!mp->m_logname)
240 return ENOMEM;
241 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
242 xfs_warn(mp, "%s option not allowed on this system",
243 this_char);
244 return EINVAL;
245 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
246 if (!value || !*value) {
247 xfs_warn(mp, "%s option requires an argument",
248 this_char);
249 return EINVAL;
250 }
251 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
252 if (!mp->m_rtname)
253 return ENOMEM;
254 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
255 if (!value || !*value) {
256 xfs_warn(mp, "%s option requires an argument",
257 this_char);
258 return EINVAL;
259 }
260 iosize = simple_strtoul(value, &eov, 10);
261 iosizelog = ffs(iosize) - 1;
262 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
263 if (!value || !*value) {
264 xfs_warn(mp, "%s option requires an argument",
265 this_char);
266 return EINVAL;
267 }
268 iosize = suffix_strtoul(value, &eov, 10);
269 iosizelog = ffs(iosize) - 1;
270 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
271 !strcmp(this_char, MNTOPT_BSDGROUPS)) {
272 mp->m_flags |= XFS_MOUNT_GRPID;
273 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
274 !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
275 mp->m_flags &= ~XFS_MOUNT_GRPID;
276 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
277 mp->m_flags |= XFS_MOUNT_WSYNC;
278 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
279 mp->m_flags |= XFS_MOUNT_NORECOVERY;
280 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
281 mp->m_flags |= XFS_MOUNT_NOALIGN;
282 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
283 mp->m_flags |= XFS_MOUNT_SWALLOC;
284 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
285 if (!value || !*value) {
286 xfs_warn(mp, "%s option requires an argument",
287 this_char);
288 return EINVAL;
289 }
290 dsunit = simple_strtoul(value, &eov, 10);
291 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
292 if (!value || !*value) {
293 xfs_warn(mp, "%s option requires an argument",
294 this_char);
295 return EINVAL;
296 }
297 dswidth = simple_strtoul(value, &eov, 10);
298 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
299 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
300 #if !XFS_BIG_INUMS
301 xfs_warn(mp, "%s option not allowed on this system",
302 this_char);
303 return EINVAL;
304 #endif
305 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
306 mp->m_flags |= XFS_MOUNT_NOUUID;
307 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
308 mp->m_flags |= XFS_MOUNT_BARRIER;
309 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
310 mp->m_flags &= ~XFS_MOUNT_BARRIER;
311 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
312 mp->m_flags |= XFS_MOUNT_IKEEP;
313 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
314 mp->m_flags &= ~XFS_MOUNT_IKEEP;
315 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
316 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
317 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
318 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
319 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
320 mp->m_flags |= XFS_MOUNT_ATTR2;
321 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
322 mp->m_flags &= ~XFS_MOUNT_ATTR2;
323 mp->m_flags |= XFS_MOUNT_NOATTR2;
324 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
325 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
326 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
327 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
328 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
329 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
330 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
331 !strcmp(this_char, MNTOPT_UQUOTA) ||
332 !strcmp(this_char, MNTOPT_USRQUOTA)) {
333 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
334 XFS_UQUOTA_ENFD);
335 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
336 !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
337 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
338 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
339 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
340 !strcmp(this_char, MNTOPT_PRJQUOTA)) {
341 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
342 XFS_OQUOTA_ENFD);
343 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
344 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
345 mp->m_qflags &= ~XFS_OQUOTA_ENFD;
346 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
347 !strcmp(this_char, MNTOPT_GRPQUOTA)) {
348 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
349 XFS_OQUOTA_ENFD);
350 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
351 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
352 mp->m_qflags &= ~XFS_OQUOTA_ENFD;
353 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
354 xfs_warn(mp,
355 "delaylog is the default now, option is deprecated.");
356 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
357 xfs_warn(mp,
358 "nodelaylog support has been removed, option is deprecated.");
359 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
360 mp->m_flags |= XFS_MOUNT_DISCARD;
361 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
362 mp->m_flags &= ~XFS_MOUNT_DISCARD;
363 } else if (!strcmp(this_char, "ihashsize")) {
364 xfs_warn(mp,
365 "ihashsize no longer used, option is deprecated.");
366 } else if (!strcmp(this_char, "osyncisdsync")) {
367 xfs_warn(mp,
368 "osyncisdsync has no effect, option is deprecated.");
369 } else if (!strcmp(this_char, "osyncisosync")) {
370 xfs_warn(mp,
371 "osyncisosync has no effect, option is deprecated.");
372 } else if (!strcmp(this_char, "irixsgid")) {
373 xfs_warn(mp,
374 "irixsgid is now a sysctl(2) variable, option is deprecated.");
375 } else {
376 xfs_warn(mp, "unknown mount option [%s].", this_char);
377 return EINVAL;
378 }
379 }
380
381 /*
382 * no recovery flag requires a read-only mount
383 */
384 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
385 !(mp->m_flags & XFS_MOUNT_RDONLY)) {
386 xfs_warn(mp, "no-recovery mounts must be read-only.");
387 return EINVAL;
388 }
389
390 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
391 xfs_warn(mp,
392 "sunit and swidth options incompatible with the noalign option");
393 return EINVAL;
394 }
395
396 #ifndef CONFIG_XFS_QUOTA
397 if (XFS_IS_QUOTA_RUNNING(mp)) {
398 xfs_warn(mp, "quota support not available in this kernel.");
399 return EINVAL;
400 }
401 #endif
402
403 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
404 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
405 xfs_warn(mp, "cannot mount with both project and group quota");
406 return EINVAL;
407 }
408
409 if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
410 xfs_warn(mp, "sunit and swidth must be specified together");
411 return EINVAL;
412 }
413
414 if (dsunit && (dswidth % dsunit != 0)) {
415 xfs_warn(mp,
416 "stripe width (%d) must be a multiple of the stripe unit (%d)",
417 dswidth, dsunit);
418 return EINVAL;
419 }
420
421 done:
422 if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) {
423 /*
424 * At this point the superblock has not been read
425 * in, therefore we do not know the block size.
426 * Before the mount call ends we will convert
427 * these to FSBs.
428 */
429 if (dsunit) {
430 mp->m_dalign = dsunit;
431 mp->m_flags |= XFS_MOUNT_RETERR;
432 }
433
434 if (dswidth)
435 mp->m_swidth = dswidth;
436 }
437
438 if (mp->m_logbufs != -1 &&
439 mp->m_logbufs != 0 &&
440 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
441 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
442 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
443 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
444 return XFS_ERROR(EINVAL);
445 }
446 if (mp->m_logbsize != -1 &&
447 mp->m_logbsize != 0 &&
448 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
449 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
450 !is_power_of_2(mp->m_logbsize))) {
451 xfs_warn(mp,
452 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
453 mp->m_logbsize);
454 return XFS_ERROR(EINVAL);
455 }
456
457 if (iosizelog) {
458 if (iosizelog > XFS_MAX_IO_LOG ||
459 iosizelog < XFS_MIN_IO_LOG) {
460 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
461 iosizelog, XFS_MIN_IO_LOG,
462 XFS_MAX_IO_LOG);
463 return XFS_ERROR(EINVAL);
464 }
465
466 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
467 mp->m_readio_log = iosizelog;
468 mp->m_writeio_log = iosizelog;
469 }
470
471 return 0;
472 }
473
474 struct proc_xfs_info {
475 int flag;
476 char *str;
477 };
478
479 STATIC int
xfs_showargs(struct xfs_mount * mp,struct seq_file * m)480 xfs_showargs(
481 struct xfs_mount *mp,
482 struct seq_file *m)
483 {
484 static struct proc_xfs_info xfs_info_set[] = {
485 /* the few simple ones we can get from the mount struct */
486 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP },
487 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC },
488 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN },
489 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC },
490 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID },
491 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY },
492 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 },
493 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
494 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
495 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD },
496 { 0, NULL }
497 };
498 static struct proc_xfs_info xfs_info_unset[] = {
499 /* the few simple ones we can get from the mount struct */
500 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO },
501 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER },
502 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE },
503 { 0, NULL }
504 };
505 struct proc_xfs_info *xfs_infop;
506
507 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
508 if (mp->m_flags & xfs_infop->flag)
509 seq_puts(m, xfs_infop->str);
510 }
511 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
512 if (!(mp->m_flags & xfs_infop->flag))
513 seq_puts(m, xfs_infop->str);
514 }
515
516 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
517 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
518 (int)(1 << mp->m_writeio_log) >> 10);
519
520 if (mp->m_logbufs > 0)
521 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
522 if (mp->m_logbsize > 0)
523 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
524
525 if (mp->m_logname)
526 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
527 if (mp->m_rtname)
528 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
529
530 if (mp->m_dalign > 0)
531 seq_printf(m, "," MNTOPT_SUNIT "=%d",
532 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
533 if (mp->m_swidth > 0)
534 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
535 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
536
537 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
538 seq_puts(m, "," MNTOPT_USRQUOTA);
539 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
540 seq_puts(m, "," MNTOPT_UQUOTANOENF);
541
542 /* Either project or group quotas can be active, not both */
543
544 if (mp->m_qflags & XFS_PQUOTA_ACCT) {
545 if (mp->m_qflags & XFS_OQUOTA_ENFD)
546 seq_puts(m, "," MNTOPT_PRJQUOTA);
547 else
548 seq_puts(m, "," MNTOPT_PQUOTANOENF);
549 } else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
550 if (mp->m_qflags & XFS_OQUOTA_ENFD)
551 seq_puts(m, "," MNTOPT_GRPQUOTA);
552 else
553 seq_puts(m, "," MNTOPT_GQUOTANOENF);
554 }
555
556 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
557 seq_puts(m, "," MNTOPT_NOQUOTA);
558
559 return 0;
560 }
561 __uint64_t
xfs_max_file_offset(unsigned int blockshift)562 xfs_max_file_offset(
563 unsigned int blockshift)
564 {
565 unsigned int pagefactor = 1;
566 unsigned int bitshift = BITS_PER_LONG - 1;
567
568 /* Figure out maximum filesize, on Linux this can depend on
569 * the filesystem blocksize (on 32 bit platforms).
570 * __block_write_begin does this in an [unsigned] long...
571 * page->index << (PAGE_CACHE_SHIFT - bbits)
572 * So, for page sized blocks (4K on 32 bit platforms),
573 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
574 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
575 * but for smaller blocksizes it is less (bbits = log2 bsize).
576 * Note1: get_block_t takes a long (implicit cast from above)
577 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
578 * can optionally convert the [unsigned] long from above into
579 * an [unsigned] long long.
580 */
581
582 #if BITS_PER_LONG == 32
583 # if defined(CONFIG_LBDAF)
584 ASSERT(sizeof(sector_t) == 8);
585 pagefactor = PAGE_CACHE_SIZE;
586 bitshift = BITS_PER_LONG;
587 # else
588 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
589 # endif
590 #endif
591
592 return (((__uint64_t)pagefactor) << bitshift) - 1;
593 }
594
595 STATIC int
xfs_blkdev_get(xfs_mount_t * mp,const char * name,struct block_device ** bdevp)596 xfs_blkdev_get(
597 xfs_mount_t *mp,
598 const char *name,
599 struct block_device **bdevp)
600 {
601 int error = 0;
602
603 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
604 mp);
605 if (IS_ERR(*bdevp)) {
606 error = PTR_ERR(*bdevp);
607 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
608 }
609
610 return -error;
611 }
612
613 STATIC void
xfs_blkdev_put(struct block_device * bdev)614 xfs_blkdev_put(
615 struct block_device *bdev)
616 {
617 if (bdev)
618 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
619 }
620
621 void
xfs_blkdev_issue_flush(xfs_buftarg_t * buftarg)622 xfs_blkdev_issue_flush(
623 xfs_buftarg_t *buftarg)
624 {
625 blkdev_issue_flush(buftarg->bt_bdev, GFP_KERNEL, NULL);
626 }
627
628 STATIC void
xfs_close_devices(struct xfs_mount * mp)629 xfs_close_devices(
630 struct xfs_mount *mp)
631 {
632 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
633 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
634 xfs_free_buftarg(mp, mp->m_logdev_targp);
635 xfs_blkdev_put(logdev);
636 }
637 if (mp->m_rtdev_targp) {
638 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
639 xfs_free_buftarg(mp, mp->m_rtdev_targp);
640 xfs_blkdev_put(rtdev);
641 }
642 xfs_free_buftarg(mp, mp->m_ddev_targp);
643 }
644
645 /*
646 * The file system configurations are:
647 * (1) device (partition) with data and internal log
648 * (2) logical volume with data and log subvolumes.
649 * (3) logical volume with data, log, and realtime subvolumes.
650 *
651 * We only have to handle opening the log and realtime volumes here if
652 * they are present. The data subvolume has already been opened by
653 * get_sb_bdev() and is stored in sb->s_bdev.
654 */
655 STATIC int
xfs_open_devices(struct xfs_mount * mp)656 xfs_open_devices(
657 struct xfs_mount *mp)
658 {
659 struct block_device *ddev = mp->m_super->s_bdev;
660 struct block_device *logdev = NULL, *rtdev = NULL;
661 int error;
662
663 /*
664 * Open real time and log devices - order is important.
665 */
666 if (mp->m_logname) {
667 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
668 if (error)
669 goto out;
670 }
671
672 if (mp->m_rtname) {
673 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
674 if (error)
675 goto out_close_logdev;
676
677 if (rtdev == ddev || rtdev == logdev) {
678 xfs_warn(mp,
679 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
680 error = EINVAL;
681 goto out_close_rtdev;
682 }
683 }
684
685 /*
686 * Setup xfs_mount buffer target pointers
687 */
688 error = ENOMEM;
689 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
690 if (!mp->m_ddev_targp)
691 goto out_close_rtdev;
692
693 if (rtdev) {
694 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
695 mp->m_fsname);
696 if (!mp->m_rtdev_targp)
697 goto out_free_ddev_targ;
698 }
699
700 if (logdev && logdev != ddev) {
701 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
702 mp->m_fsname);
703 if (!mp->m_logdev_targp)
704 goto out_free_rtdev_targ;
705 } else {
706 mp->m_logdev_targp = mp->m_ddev_targp;
707 }
708
709 return 0;
710
711 out_free_rtdev_targ:
712 if (mp->m_rtdev_targp)
713 xfs_free_buftarg(mp, mp->m_rtdev_targp);
714 out_free_ddev_targ:
715 xfs_free_buftarg(mp, mp->m_ddev_targp);
716 out_close_rtdev:
717 if (rtdev)
718 xfs_blkdev_put(rtdev);
719 out_close_logdev:
720 if (logdev && logdev != ddev)
721 xfs_blkdev_put(logdev);
722 out:
723 return error;
724 }
725
726 /*
727 * Setup xfs_mount buffer target pointers based on superblock
728 */
729 STATIC int
xfs_setup_devices(struct xfs_mount * mp)730 xfs_setup_devices(
731 struct xfs_mount *mp)
732 {
733 int error;
734
735 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
736 mp->m_sb.sb_sectsize);
737 if (error)
738 return error;
739
740 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
741 unsigned int log_sector_size = BBSIZE;
742
743 if (xfs_sb_version_hassector(&mp->m_sb))
744 log_sector_size = mp->m_sb.sb_logsectsize;
745 error = xfs_setsize_buftarg(mp->m_logdev_targp,
746 mp->m_sb.sb_blocksize,
747 log_sector_size);
748 if (error)
749 return error;
750 }
751 if (mp->m_rtdev_targp) {
752 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
753 mp->m_sb.sb_blocksize,
754 mp->m_sb.sb_sectsize);
755 if (error)
756 return error;
757 }
758
759 return 0;
760 }
761
762 STATIC int
xfs_init_mount_workqueues(struct xfs_mount * mp)763 xfs_init_mount_workqueues(
764 struct xfs_mount *mp)
765 {
766 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
767 WQ_MEM_RECLAIM, 0, mp->m_fsname);
768 if (!mp->m_data_workqueue)
769 goto out;
770
771 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
772 WQ_MEM_RECLAIM, 0, mp->m_fsname);
773 if (!mp->m_unwritten_workqueue)
774 goto out_destroy_data_iodone_queue;
775
776 return 0;
777
778 out_destroy_data_iodone_queue:
779 destroy_workqueue(mp->m_data_workqueue);
780 out:
781 return -ENOMEM;
782 }
783
784 STATIC void
xfs_destroy_mount_workqueues(struct xfs_mount * mp)785 xfs_destroy_mount_workqueues(
786 struct xfs_mount *mp)
787 {
788 destroy_workqueue(mp->m_data_workqueue);
789 destroy_workqueue(mp->m_unwritten_workqueue);
790 }
791
792 /* Catch misguided souls that try to use this interface on XFS */
793 STATIC struct inode *
xfs_fs_alloc_inode(struct super_block * sb)794 xfs_fs_alloc_inode(
795 struct super_block *sb)
796 {
797 BUG();
798 return NULL;
799 }
800
801 /*
802 * Now that the generic code is guaranteed not to be accessing
803 * the linux inode, we can reclaim the inode.
804 */
805 STATIC void
xfs_fs_destroy_inode(struct inode * inode)806 xfs_fs_destroy_inode(
807 struct inode *inode)
808 {
809 struct xfs_inode *ip = XFS_I(inode);
810
811 trace_xfs_destroy_inode(ip);
812
813 XFS_STATS_INC(vn_reclaim);
814
815 /* bad inode, get out here ASAP */
816 if (is_bad_inode(inode))
817 goto out_reclaim;
818
819 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
820
821 /*
822 * We should never get here with one of the reclaim flags already set.
823 */
824 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
825 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
826
827 /*
828 * We always use background reclaim here because even if the
829 * inode is clean, it still may be under IO and hence we have
830 * to take the flush lock. The background reclaim path handles
831 * this more efficiently than we can here, so simply let background
832 * reclaim tear down all inodes.
833 */
834 out_reclaim:
835 xfs_inode_set_reclaim_tag(ip);
836 }
837
838 /*
839 * Slab object creation initialisation for the XFS inode.
840 * This covers only the idempotent fields in the XFS inode;
841 * all other fields need to be initialised on allocation
842 * from the slab. This avoids the need to repeatedly initialise
843 * fields in the xfs inode that left in the initialise state
844 * when freeing the inode.
845 */
846 STATIC void
xfs_fs_inode_init_once(void * inode)847 xfs_fs_inode_init_once(
848 void *inode)
849 {
850 struct xfs_inode *ip = inode;
851
852 memset(ip, 0, sizeof(struct xfs_inode));
853
854 /* vfs inode */
855 inode_init_once(VFS_I(ip));
856
857 /* xfs inode */
858 atomic_set(&ip->i_pincount, 0);
859 spin_lock_init(&ip->i_flags_lock);
860
861 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
862 "xfsino", ip->i_ino);
863 }
864
865 /*
866 * This is called by the VFS when dirtying inode metadata. This can happen
867 * for a few reasons, but we only care about timestamp updates, given that
868 * we handled the rest ourselves. In theory no other calls should happen,
869 * but for example generic_write_end() keeps dirtying the inode after
870 * updating i_size. Thus we check that the flags are exactly I_DIRTY_SYNC,
871 * and skip this call otherwise.
872 *
873 * We'll hopefull get a different method just for updating timestamps soon,
874 * at which point this hack can go away, and maybe we'll also get real
875 * error handling here.
876 */
877 STATIC void
xfs_fs_dirty_inode(struct inode * inode,int flags)878 xfs_fs_dirty_inode(
879 struct inode *inode,
880 int flags)
881 {
882 struct xfs_inode *ip = XFS_I(inode);
883 struct xfs_mount *mp = ip->i_mount;
884 struct xfs_trans *tp;
885 int error;
886
887 if (flags != I_DIRTY_SYNC)
888 return;
889
890 trace_xfs_dirty_inode(ip);
891
892 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
893 error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
894 if (error) {
895 xfs_trans_cancel(tp, 0);
896 goto trouble;
897 }
898 xfs_ilock(ip, XFS_ILOCK_EXCL);
899 /*
900 * Grab all the latest timestamps from the Linux inode.
901 */
902 ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
903 ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
904 ip->i_d.di_ctime.t_sec = (__int32_t)inode->i_ctime.tv_sec;
905 ip->i_d.di_ctime.t_nsec = (__int32_t)inode->i_ctime.tv_nsec;
906 ip->i_d.di_mtime.t_sec = (__int32_t)inode->i_mtime.tv_sec;
907 ip->i_d.di_mtime.t_nsec = (__int32_t)inode->i_mtime.tv_nsec;
908
909 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
910 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
911 error = xfs_trans_commit(tp, 0);
912 if (error)
913 goto trouble;
914 return;
915
916 trouble:
917 xfs_warn(mp, "failed to update timestamps for inode 0x%llx", ip->i_ino);
918 }
919
920 STATIC void
xfs_fs_evict_inode(struct inode * inode)921 xfs_fs_evict_inode(
922 struct inode *inode)
923 {
924 xfs_inode_t *ip = XFS_I(inode);
925
926 trace_xfs_evict_inode(ip);
927
928 truncate_inode_pages(&inode->i_data, 0);
929 end_writeback(inode);
930 XFS_STATS_INC(vn_rele);
931 XFS_STATS_INC(vn_remove);
932 XFS_STATS_DEC(vn_active);
933
934 /*
935 * The iolock is used by the file system to coordinate reads,
936 * writes, and block truncates. Up to this point the lock
937 * protected concurrent accesses by users of the inode. But
938 * from here forward we're doing some final processing of the
939 * inode because we're done with it, and although we reuse the
940 * iolock for protection it is really a distinct lock class
941 * (in the lockdep sense) from before. To keep lockdep happy
942 * (and basically indicate what we are doing), we explicitly
943 * re-init the iolock here.
944 */
945 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
946 mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
947 lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
948 &xfs_iolock_reclaimable, "xfs_iolock_reclaimable");
949
950 xfs_inactive(ip);
951 }
952
953 /*
954 * We do an unlocked check for XFS_IDONTCACHE here because we are already
955 * serialised against cache hits here via the inode->i_lock and igrab() in
956 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
957 * racing with us, and it avoids needing to grab a spinlock here for every inode
958 * we drop the final reference on.
959 */
960 STATIC int
xfs_fs_drop_inode(struct inode * inode)961 xfs_fs_drop_inode(
962 struct inode *inode)
963 {
964 struct xfs_inode *ip = XFS_I(inode);
965
966 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
967 }
968
969 STATIC void
xfs_free_fsname(struct xfs_mount * mp)970 xfs_free_fsname(
971 struct xfs_mount *mp)
972 {
973 kfree(mp->m_fsname);
974 kfree(mp->m_rtname);
975 kfree(mp->m_logname);
976 }
977
978 STATIC void
xfs_fs_put_super(struct super_block * sb)979 xfs_fs_put_super(
980 struct super_block *sb)
981 {
982 struct xfs_mount *mp = XFS_M(sb);
983
984 xfs_syncd_stop(mp);
985
986 /*
987 * Blow away any referenced inode in the filestreams cache.
988 * This can and will cause log traffic as inodes go inactive
989 * here.
990 */
991 xfs_filestream_unmount(mp);
992
993 xfs_flush_buftarg(mp->m_ddev_targp, 1);
994
995 xfs_unmountfs(mp);
996 xfs_freesb(mp);
997 xfs_icsb_destroy_counters(mp);
998 xfs_destroy_mount_workqueues(mp);
999 xfs_close_devices(mp);
1000 xfs_free_fsname(mp);
1001 kfree(mp);
1002 }
1003
1004 STATIC int
xfs_fs_sync_fs(struct super_block * sb,int wait)1005 xfs_fs_sync_fs(
1006 struct super_block *sb,
1007 int wait)
1008 {
1009 struct xfs_mount *mp = XFS_M(sb);
1010 int error;
1011
1012 /*
1013 * Doing anything during the async pass would be counterproductive.
1014 */
1015 if (!wait)
1016 return 0;
1017
1018 error = xfs_quiesce_data(mp);
1019 if (error)
1020 return -error;
1021
1022 if (laptop_mode) {
1023 /*
1024 * The disk must be active because we're syncing.
1025 * We schedule xfssyncd now (now that the disk is
1026 * active) instead of later (when it might not be).
1027 */
1028 flush_delayed_work_sync(&mp->m_sync_work);
1029 }
1030
1031 return 0;
1032 }
1033
1034 STATIC int
xfs_fs_statfs(struct dentry * dentry,struct kstatfs * statp)1035 xfs_fs_statfs(
1036 struct dentry *dentry,
1037 struct kstatfs *statp)
1038 {
1039 struct xfs_mount *mp = XFS_M(dentry->d_sb);
1040 xfs_sb_t *sbp = &mp->m_sb;
1041 struct xfs_inode *ip = XFS_I(dentry->d_inode);
1042 __uint64_t fakeinos, id;
1043 xfs_extlen_t lsize;
1044 __int64_t ffree;
1045
1046 statp->f_type = XFS_SB_MAGIC;
1047 statp->f_namelen = MAXNAMELEN - 1;
1048
1049 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1050 statp->f_fsid.val[0] = (u32)id;
1051 statp->f_fsid.val[1] = (u32)(id >> 32);
1052
1053 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1054
1055 spin_lock(&mp->m_sb_lock);
1056 statp->f_bsize = sbp->sb_blocksize;
1057 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1058 statp->f_blocks = sbp->sb_dblocks - lsize;
1059 statp->f_bfree = statp->f_bavail =
1060 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1061 fakeinos = statp->f_bfree << sbp->sb_inopblog;
1062 statp->f_files =
1063 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1064 if (mp->m_maxicount)
1065 statp->f_files = min_t(typeof(statp->f_files),
1066 statp->f_files,
1067 mp->m_maxicount);
1068
1069 /* make sure statp->f_ffree does not underflow */
1070 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1071 statp->f_ffree = max_t(__int64_t, ffree, 0);
1072
1073 spin_unlock(&mp->m_sb_lock);
1074
1075 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
1076 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
1077 (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
1078 xfs_qm_statvfs(ip, statp);
1079 return 0;
1080 }
1081
1082 STATIC void
xfs_save_resvblks(struct xfs_mount * mp)1083 xfs_save_resvblks(struct xfs_mount *mp)
1084 {
1085 __uint64_t resblks = 0;
1086
1087 mp->m_resblks_save = mp->m_resblks;
1088 xfs_reserve_blocks(mp, &resblks, NULL);
1089 }
1090
1091 STATIC void
xfs_restore_resvblks(struct xfs_mount * mp)1092 xfs_restore_resvblks(struct xfs_mount *mp)
1093 {
1094 __uint64_t resblks;
1095
1096 if (mp->m_resblks_save) {
1097 resblks = mp->m_resblks_save;
1098 mp->m_resblks_save = 0;
1099 } else
1100 resblks = xfs_default_resblks(mp);
1101
1102 xfs_reserve_blocks(mp, &resblks, NULL);
1103 }
1104
1105 STATIC int
xfs_fs_remount(struct super_block * sb,int * flags,char * options)1106 xfs_fs_remount(
1107 struct super_block *sb,
1108 int *flags,
1109 char *options)
1110 {
1111 struct xfs_mount *mp = XFS_M(sb);
1112 substring_t args[MAX_OPT_ARGS];
1113 char *p;
1114 int error;
1115
1116 while ((p = strsep(&options, ",")) != NULL) {
1117 int token;
1118
1119 if (!*p)
1120 continue;
1121
1122 token = match_token(p, tokens, args);
1123 switch (token) {
1124 case Opt_barrier:
1125 mp->m_flags |= XFS_MOUNT_BARRIER;
1126 break;
1127 case Opt_nobarrier:
1128 mp->m_flags &= ~XFS_MOUNT_BARRIER;
1129 break;
1130 default:
1131 /*
1132 * Logically we would return an error here to prevent
1133 * users from believing they might have changed
1134 * mount options using remount which can't be changed.
1135 *
1136 * But unfortunately mount(8) adds all options from
1137 * mtab and fstab to the mount arguments in some cases
1138 * so we can't blindly reject options, but have to
1139 * check for each specified option if it actually
1140 * differs from the currently set option and only
1141 * reject it if that's the case.
1142 *
1143 * Until that is implemented we return success for
1144 * every remount request, and silently ignore all
1145 * options that we can't actually change.
1146 */
1147 #if 0
1148 xfs_info(mp,
1149 "mount option \"%s\" not supported for remount\n", p);
1150 return -EINVAL;
1151 #else
1152 break;
1153 #endif
1154 }
1155 }
1156
1157 /* ro -> rw */
1158 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1159 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1160
1161 /*
1162 * If this is the first remount to writeable state we
1163 * might have some superblock changes to update.
1164 */
1165 if (mp->m_update_flags) {
1166 error = xfs_mount_log_sb(mp, mp->m_update_flags);
1167 if (error) {
1168 xfs_warn(mp, "failed to write sb changes");
1169 return error;
1170 }
1171 mp->m_update_flags = 0;
1172 }
1173
1174 /*
1175 * Fill out the reserve pool if it is empty. Use the stashed
1176 * value if it is non-zero, otherwise go with the default.
1177 */
1178 xfs_restore_resvblks(mp);
1179 }
1180
1181 /* rw -> ro */
1182 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1183 /*
1184 * After we have synced the data but before we sync the
1185 * metadata, we need to free up the reserve block pool so that
1186 * the used block count in the superblock on disk is correct at
1187 * the end of the remount. Stash the current reserve pool size
1188 * so that if we get remounted rw, we can return it to the same
1189 * size.
1190 */
1191
1192 xfs_quiesce_data(mp);
1193 xfs_save_resvblks(mp);
1194 xfs_quiesce_attr(mp);
1195 mp->m_flags |= XFS_MOUNT_RDONLY;
1196 }
1197
1198 return 0;
1199 }
1200
1201 /*
1202 * Second stage of a freeze. The data is already frozen so we only
1203 * need to take care of the metadata. Once that's done write a dummy
1204 * record to dirty the log in case of a crash while frozen.
1205 */
1206 STATIC int
xfs_fs_freeze(struct super_block * sb)1207 xfs_fs_freeze(
1208 struct super_block *sb)
1209 {
1210 struct xfs_mount *mp = XFS_M(sb);
1211
1212 xfs_save_resvblks(mp);
1213 xfs_quiesce_attr(mp);
1214 return -xfs_fs_log_dummy(mp);
1215 }
1216
1217 STATIC int
xfs_fs_unfreeze(struct super_block * sb)1218 xfs_fs_unfreeze(
1219 struct super_block *sb)
1220 {
1221 struct xfs_mount *mp = XFS_M(sb);
1222
1223 xfs_restore_resvblks(mp);
1224 return 0;
1225 }
1226
1227 STATIC int
xfs_fs_show_options(struct seq_file * m,struct dentry * root)1228 xfs_fs_show_options(
1229 struct seq_file *m,
1230 struct dentry *root)
1231 {
1232 return -xfs_showargs(XFS_M(root->d_sb), m);
1233 }
1234
1235 /*
1236 * This function fills in xfs_mount_t fields based on mount args.
1237 * Note: the superblock _has_ now been read in.
1238 */
1239 STATIC int
xfs_finish_flags(struct xfs_mount * mp)1240 xfs_finish_flags(
1241 struct xfs_mount *mp)
1242 {
1243 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1244
1245 /* Fail a mount where the logbuf is smaller than the log stripe */
1246 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1247 if (mp->m_logbsize <= 0 &&
1248 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1249 mp->m_logbsize = mp->m_sb.sb_logsunit;
1250 } else if (mp->m_logbsize > 0 &&
1251 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1252 xfs_warn(mp,
1253 "logbuf size must be greater than or equal to log stripe size");
1254 return XFS_ERROR(EINVAL);
1255 }
1256 } else {
1257 /* Fail a mount if the logbuf is larger than 32K */
1258 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1259 xfs_warn(mp,
1260 "logbuf size for version 1 logs must be 16K or 32K");
1261 return XFS_ERROR(EINVAL);
1262 }
1263 }
1264
1265 /*
1266 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1267 * told by noattr2 to turn it off
1268 */
1269 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1270 !(mp->m_flags & XFS_MOUNT_NOATTR2))
1271 mp->m_flags |= XFS_MOUNT_ATTR2;
1272
1273 /*
1274 * prohibit r/w mounts of read-only filesystems
1275 */
1276 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1277 xfs_warn(mp,
1278 "cannot mount a read-only filesystem as read-write");
1279 return XFS_ERROR(EROFS);
1280 }
1281
1282 return 0;
1283 }
1284
1285 STATIC int
xfs_fs_fill_super(struct super_block * sb,void * data,int silent)1286 xfs_fs_fill_super(
1287 struct super_block *sb,
1288 void *data,
1289 int silent)
1290 {
1291 struct inode *root;
1292 struct xfs_mount *mp = NULL;
1293 int flags = 0, error = ENOMEM;
1294
1295 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1296 if (!mp)
1297 goto out;
1298
1299 spin_lock_init(&mp->m_sb_lock);
1300 mutex_init(&mp->m_growlock);
1301 atomic_set(&mp->m_active_trans, 0);
1302
1303 mp->m_super = sb;
1304 sb->s_fs_info = mp;
1305
1306 error = xfs_parseargs(mp, (char *)data);
1307 if (error)
1308 goto out_free_fsname;
1309
1310 sb_min_blocksize(sb, BBSIZE);
1311 sb->s_xattr = xfs_xattr_handlers;
1312 sb->s_export_op = &xfs_export_operations;
1313 #ifdef CONFIG_XFS_QUOTA
1314 sb->s_qcop = &xfs_quotactl_operations;
1315 #endif
1316 sb->s_op = &xfs_super_operations;
1317
1318 if (silent)
1319 flags |= XFS_MFSI_QUIET;
1320
1321 error = xfs_open_devices(mp);
1322 if (error)
1323 goto out_free_fsname;
1324
1325 error = xfs_init_mount_workqueues(mp);
1326 if (error)
1327 goto out_close_devices;
1328
1329 error = xfs_icsb_init_counters(mp);
1330 if (error)
1331 goto out_destroy_workqueues;
1332
1333 error = xfs_readsb(mp, flags);
1334 if (error)
1335 goto out_destroy_counters;
1336
1337 error = xfs_finish_flags(mp);
1338 if (error)
1339 goto out_free_sb;
1340
1341 error = xfs_setup_devices(mp);
1342 if (error)
1343 goto out_free_sb;
1344
1345 error = xfs_filestream_mount(mp);
1346 if (error)
1347 goto out_free_sb;
1348
1349 /*
1350 * we must configure the block size in the superblock before we run the
1351 * full mount process as the mount process can lookup and cache inodes.
1352 * For the same reason we must also initialise the syncd and register
1353 * the inode cache shrinker so that inodes can be reclaimed during
1354 * operations like a quotacheck that iterate all inodes in the
1355 * filesystem.
1356 */
1357 sb->s_magic = XFS_SB_MAGIC;
1358 sb->s_blocksize = mp->m_sb.sb_blocksize;
1359 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1360 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1361 sb->s_max_links = XFS_MAXLINK;
1362 sb->s_time_gran = 1;
1363 set_posix_acl_flag(sb);
1364
1365 error = xfs_mountfs(mp);
1366 if (error)
1367 goto out_filestream_unmount;
1368
1369 error = xfs_syncd_init(mp);
1370 if (error)
1371 goto out_unmount;
1372
1373 root = igrab(VFS_I(mp->m_rootip));
1374 if (!root) {
1375 error = ENOENT;
1376 goto out_syncd_stop;
1377 }
1378 if (is_bad_inode(root)) {
1379 error = EINVAL;
1380 goto out_syncd_stop;
1381 }
1382 sb->s_root = d_make_root(root);
1383 if (!sb->s_root) {
1384 error = ENOMEM;
1385 goto out_syncd_stop;
1386 }
1387
1388 return 0;
1389
1390 out_filestream_unmount:
1391 xfs_filestream_unmount(mp);
1392 out_free_sb:
1393 xfs_freesb(mp);
1394 out_destroy_counters:
1395 xfs_icsb_destroy_counters(mp);
1396 out_destroy_workqueues:
1397 xfs_destroy_mount_workqueues(mp);
1398 out_close_devices:
1399 xfs_close_devices(mp);
1400 out_free_fsname:
1401 xfs_free_fsname(mp);
1402 kfree(mp);
1403 out:
1404 return -error;
1405
1406 out_syncd_stop:
1407 xfs_syncd_stop(mp);
1408 out_unmount:
1409 /*
1410 * Blow away any referenced inode in the filestreams cache.
1411 * This can and will cause log traffic as inodes go inactive
1412 * here.
1413 */
1414 xfs_filestream_unmount(mp);
1415
1416 xfs_flush_buftarg(mp->m_ddev_targp, 1);
1417
1418 xfs_unmountfs(mp);
1419 goto out_free_sb;
1420 }
1421
1422 STATIC struct dentry *
xfs_fs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)1423 xfs_fs_mount(
1424 struct file_system_type *fs_type,
1425 int flags,
1426 const char *dev_name,
1427 void *data)
1428 {
1429 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1430 }
1431
1432 static int
xfs_fs_nr_cached_objects(struct super_block * sb)1433 xfs_fs_nr_cached_objects(
1434 struct super_block *sb)
1435 {
1436 return xfs_reclaim_inodes_count(XFS_M(sb));
1437 }
1438
1439 static void
xfs_fs_free_cached_objects(struct super_block * sb,int nr_to_scan)1440 xfs_fs_free_cached_objects(
1441 struct super_block *sb,
1442 int nr_to_scan)
1443 {
1444 xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1445 }
1446
1447 static const struct super_operations xfs_super_operations = {
1448 .alloc_inode = xfs_fs_alloc_inode,
1449 .destroy_inode = xfs_fs_destroy_inode,
1450 .dirty_inode = xfs_fs_dirty_inode,
1451 .evict_inode = xfs_fs_evict_inode,
1452 .drop_inode = xfs_fs_drop_inode,
1453 .put_super = xfs_fs_put_super,
1454 .sync_fs = xfs_fs_sync_fs,
1455 .freeze_fs = xfs_fs_freeze,
1456 .unfreeze_fs = xfs_fs_unfreeze,
1457 .statfs = xfs_fs_statfs,
1458 .remount_fs = xfs_fs_remount,
1459 .show_options = xfs_fs_show_options,
1460 .nr_cached_objects = xfs_fs_nr_cached_objects,
1461 .free_cached_objects = xfs_fs_free_cached_objects,
1462 };
1463
1464 static struct file_system_type xfs_fs_type = {
1465 .owner = THIS_MODULE,
1466 .name = "xfs",
1467 .mount = xfs_fs_mount,
1468 .kill_sb = kill_block_super,
1469 .fs_flags = FS_REQUIRES_DEV,
1470 };
1471
1472 STATIC int __init
xfs_init_zones(void)1473 xfs_init_zones(void)
1474 {
1475
1476 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1477 if (!xfs_ioend_zone)
1478 goto out;
1479
1480 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1481 xfs_ioend_zone);
1482 if (!xfs_ioend_pool)
1483 goto out_destroy_ioend_zone;
1484
1485 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1486 "xfs_log_ticket");
1487 if (!xfs_log_ticket_zone)
1488 goto out_destroy_ioend_pool;
1489
1490 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1491 "xfs_bmap_free_item");
1492 if (!xfs_bmap_free_item_zone)
1493 goto out_destroy_log_ticket_zone;
1494
1495 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1496 "xfs_btree_cur");
1497 if (!xfs_btree_cur_zone)
1498 goto out_destroy_bmap_free_item_zone;
1499
1500 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1501 "xfs_da_state");
1502 if (!xfs_da_state_zone)
1503 goto out_destroy_btree_cur_zone;
1504
1505 xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
1506 if (!xfs_dabuf_zone)
1507 goto out_destroy_da_state_zone;
1508
1509 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1510 if (!xfs_ifork_zone)
1511 goto out_destroy_dabuf_zone;
1512
1513 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1514 if (!xfs_trans_zone)
1515 goto out_destroy_ifork_zone;
1516
1517 xfs_log_item_desc_zone =
1518 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1519 "xfs_log_item_desc");
1520 if (!xfs_log_item_desc_zone)
1521 goto out_destroy_trans_zone;
1522
1523 /*
1524 * The size of the zone allocated buf log item is the maximum
1525 * size possible under XFS. This wastes a little bit of memory,
1526 * but it is much faster.
1527 */
1528 xfs_buf_item_zone = kmem_zone_init((sizeof(xfs_buf_log_item_t) +
1529 (((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) /
1530 NBWORD) * sizeof(int))), "xfs_buf_item");
1531 if (!xfs_buf_item_zone)
1532 goto out_destroy_log_item_desc_zone;
1533
1534 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1535 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1536 sizeof(xfs_extent_t))), "xfs_efd_item");
1537 if (!xfs_efd_zone)
1538 goto out_destroy_buf_item_zone;
1539
1540 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1541 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1542 sizeof(xfs_extent_t))), "xfs_efi_item");
1543 if (!xfs_efi_zone)
1544 goto out_destroy_efd_zone;
1545
1546 xfs_inode_zone =
1547 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1548 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1549 xfs_fs_inode_init_once);
1550 if (!xfs_inode_zone)
1551 goto out_destroy_efi_zone;
1552
1553 xfs_ili_zone =
1554 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1555 KM_ZONE_SPREAD, NULL);
1556 if (!xfs_ili_zone)
1557 goto out_destroy_inode_zone;
1558
1559 return 0;
1560
1561 out_destroy_inode_zone:
1562 kmem_zone_destroy(xfs_inode_zone);
1563 out_destroy_efi_zone:
1564 kmem_zone_destroy(xfs_efi_zone);
1565 out_destroy_efd_zone:
1566 kmem_zone_destroy(xfs_efd_zone);
1567 out_destroy_buf_item_zone:
1568 kmem_zone_destroy(xfs_buf_item_zone);
1569 out_destroy_log_item_desc_zone:
1570 kmem_zone_destroy(xfs_log_item_desc_zone);
1571 out_destroy_trans_zone:
1572 kmem_zone_destroy(xfs_trans_zone);
1573 out_destroy_ifork_zone:
1574 kmem_zone_destroy(xfs_ifork_zone);
1575 out_destroy_dabuf_zone:
1576 kmem_zone_destroy(xfs_dabuf_zone);
1577 out_destroy_da_state_zone:
1578 kmem_zone_destroy(xfs_da_state_zone);
1579 out_destroy_btree_cur_zone:
1580 kmem_zone_destroy(xfs_btree_cur_zone);
1581 out_destroy_bmap_free_item_zone:
1582 kmem_zone_destroy(xfs_bmap_free_item_zone);
1583 out_destroy_log_ticket_zone:
1584 kmem_zone_destroy(xfs_log_ticket_zone);
1585 out_destroy_ioend_pool:
1586 mempool_destroy(xfs_ioend_pool);
1587 out_destroy_ioend_zone:
1588 kmem_zone_destroy(xfs_ioend_zone);
1589 out:
1590 return -ENOMEM;
1591 }
1592
1593 STATIC void
xfs_destroy_zones(void)1594 xfs_destroy_zones(void)
1595 {
1596 kmem_zone_destroy(xfs_ili_zone);
1597 kmem_zone_destroy(xfs_inode_zone);
1598 kmem_zone_destroy(xfs_efi_zone);
1599 kmem_zone_destroy(xfs_efd_zone);
1600 kmem_zone_destroy(xfs_buf_item_zone);
1601 kmem_zone_destroy(xfs_log_item_desc_zone);
1602 kmem_zone_destroy(xfs_trans_zone);
1603 kmem_zone_destroy(xfs_ifork_zone);
1604 kmem_zone_destroy(xfs_dabuf_zone);
1605 kmem_zone_destroy(xfs_da_state_zone);
1606 kmem_zone_destroy(xfs_btree_cur_zone);
1607 kmem_zone_destroy(xfs_bmap_free_item_zone);
1608 kmem_zone_destroy(xfs_log_ticket_zone);
1609 mempool_destroy(xfs_ioend_pool);
1610 kmem_zone_destroy(xfs_ioend_zone);
1611
1612 }
1613
1614 STATIC int __init
xfs_init_workqueues(void)1615 xfs_init_workqueues(void)
1616 {
1617 /*
1618 * We never want to the same work item to run twice, reclaiming inodes
1619 * or idling the log is not going to get any faster by multiple CPUs
1620 * competing for ressources. Use the default large max_active value
1621 * so that even lots of filesystems can perform these task in parallel.
1622 */
1623 xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0);
1624 if (!xfs_syncd_wq)
1625 return -ENOMEM;
1626
1627 /*
1628 * The allocation workqueue can be used in memory reclaim situations
1629 * (writepage path), and parallelism is only limited by the number of
1630 * AGs in all the filesystems mounted. Hence use the default large
1631 * max_active value for this workqueue.
1632 */
1633 xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1634 if (!xfs_alloc_wq)
1635 goto out_destroy_syncd;
1636
1637 return 0;
1638
1639 out_destroy_syncd:
1640 destroy_workqueue(xfs_syncd_wq);
1641 return -ENOMEM;
1642 }
1643
1644 STATIC void
xfs_destroy_workqueues(void)1645 xfs_destroy_workqueues(void)
1646 {
1647 destroy_workqueue(xfs_alloc_wq);
1648 destroy_workqueue(xfs_syncd_wq);
1649 }
1650
1651 STATIC int __init
init_xfs_fs(void)1652 init_xfs_fs(void)
1653 {
1654 int error;
1655
1656 printk(KERN_INFO XFS_VERSION_STRING " with "
1657 XFS_BUILD_OPTIONS " enabled\n");
1658
1659 xfs_dir_startup();
1660
1661 error = xfs_init_zones();
1662 if (error)
1663 goto out;
1664
1665 error = xfs_init_workqueues();
1666 if (error)
1667 goto out_destroy_zones;
1668
1669 error = xfs_mru_cache_init();
1670 if (error)
1671 goto out_destroy_wq;
1672
1673 error = xfs_filestream_init();
1674 if (error)
1675 goto out_mru_cache_uninit;
1676
1677 error = xfs_buf_init();
1678 if (error)
1679 goto out_filestream_uninit;
1680
1681 error = xfs_init_procfs();
1682 if (error)
1683 goto out_buf_terminate;
1684
1685 error = xfs_sysctl_register();
1686 if (error)
1687 goto out_cleanup_procfs;
1688
1689 error = xfs_qm_init();
1690 if (error)
1691 goto out_sysctl_unregister;
1692
1693 error = register_filesystem(&xfs_fs_type);
1694 if (error)
1695 goto out_qm_exit;
1696 return 0;
1697
1698 out_qm_exit:
1699 xfs_qm_exit();
1700 out_sysctl_unregister:
1701 xfs_sysctl_unregister();
1702 out_cleanup_procfs:
1703 xfs_cleanup_procfs();
1704 out_buf_terminate:
1705 xfs_buf_terminate();
1706 out_filestream_uninit:
1707 xfs_filestream_uninit();
1708 out_mru_cache_uninit:
1709 xfs_mru_cache_uninit();
1710 out_destroy_wq:
1711 xfs_destroy_workqueues();
1712 out_destroy_zones:
1713 xfs_destroy_zones();
1714 out:
1715 return error;
1716 }
1717
1718 STATIC void __exit
exit_xfs_fs(void)1719 exit_xfs_fs(void)
1720 {
1721 xfs_qm_exit();
1722 unregister_filesystem(&xfs_fs_type);
1723 xfs_sysctl_unregister();
1724 xfs_cleanup_procfs();
1725 xfs_buf_terminate();
1726 xfs_filestream_uninit();
1727 xfs_mru_cache_uninit();
1728 xfs_destroy_workqueues();
1729 xfs_destroy_zones();
1730 }
1731
1732 module_init(init_xfs_fs);
1733 module_exit(exit_xfs_fs);
1734
1735 MODULE_AUTHOR("Silicon Graphics, Inc.");
1736 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1737 MODULE_LICENSE("GPL");
1738