1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "xfs.h"
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_inode.h"
28 #include "xfs_btree.h"
29 #include "xfs_bmap.h"
30 #include "xfs_alloc.h"
31 #include "xfs_error.h"
32 #include "xfs_fsops.h"
33 #include "xfs_trans.h"
34 #include "xfs_buf_item.h"
35 #include "xfs_log.h"
36 #include "xfs_log_priv.h"
37 #include "xfs_da_btree.h"
38 #include "xfs_dir2.h"
39 #include "xfs_extfree_item.h"
40 #include "xfs_mru_cache.h"
41 #include "xfs_inode_item.h"
42 #include "xfs_icache.h"
43 #include "xfs_trace.h"
44 #include "xfs_icreate_item.h"
45 #include "xfs_filestream.h"
46 #include "xfs_quota.h"
47 #include "xfs_sysfs.h"
48
49 #include <linux/namei.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/mount.h>
53 #include <linux/mempool.h>
54 #include <linux/writeback.h>
55 #include <linux/kthread.h>
56 #include <linux/freezer.h>
57 #include <linux/parser.h>
58
59 static const struct super_operations xfs_super_operations;
60 static kmem_zone_t *xfs_ioend_zone;
61 mempool_t *xfs_ioend_pool;
62
63 static struct kset *xfs_kset; /* top-level xfs sysfs dir */
64 #ifdef DEBUG
65 static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
66 #endif
67
68 #define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
69 #define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
70 #define MNTOPT_LOGDEV "logdev" /* log device */
71 #define MNTOPT_RTDEV "rtdev" /* realtime I/O device */
72 #define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */
73 #define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */
74 #define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */
75 #define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */
76 #define MNTOPT_SUNIT "sunit" /* data volume stripe unit */
77 #define MNTOPT_SWIDTH "swidth" /* data volume stripe width */
78 #define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */
79 #define MNTOPT_MTPT "mtpt" /* filesystem mount point */
80 #define MNTOPT_GRPID "grpid" /* group-ID from parent directory */
81 #define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */
82 #define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */
83 #define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */
84 #define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */
85 #define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */
86 #define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and
87 * unwritten extent conversion */
88 #define MNTOPT_NOBARRIER "nobarrier" /* .. disable */
89 #define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */
90 #define MNTOPT_32BITINODE "inode32" /* inode allocation limited to
91 * XFS_MAXINUMBER_32 */
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_DISCARD "discard" /* Discard unused blocks */
113 #define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */
114
115 /*
116 * Table driven mount option parser.
117 *
118 * Currently only used for remount, but it will be used for mount
119 * in the future, too.
120 */
121 enum {
122 Opt_barrier,
123 Opt_nobarrier,
124 Opt_inode64,
125 Opt_inode32,
126 Opt_err
127 };
128
129 static const match_table_t tokens = {
130 {Opt_barrier, "barrier"},
131 {Opt_nobarrier, "nobarrier"},
132 {Opt_inode64, "inode64"},
133 {Opt_inode32, "inode32"},
134 {Opt_err, NULL}
135 };
136
137
138 STATIC unsigned long
suffix_kstrtoint(char * s,unsigned int base,int * res)139 suffix_kstrtoint(char *s, unsigned int base, int *res)
140 {
141 int last, shift_left_factor = 0, _res;
142 char *value = s;
143
144 last = strlen(value) - 1;
145 if (value[last] == 'K' || value[last] == 'k') {
146 shift_left_factor = 10;
147 value[last] = '\0';
148 }
149 if (value[last] == 'M' || value[last] == 'm') {
150 shift_left_factor = 20;
151 value[last] = '\0';
152 }
153 if (value[last] == 'G' || value[last] == 'g') {
154 shift_left_factor = 30;
155 value[last] = '\0';
156 }
157
158 if (kstrtoint(s, base, &_res))
159 return -EINVAL;
160 *res = _res << shift_left_factor;
161 return 0;
162 }
163
164 /*
165 * This function fills in xfs_mount_t fields based on mount args.
166 * Note: the superblock has _not_ yet been read in.
167 *
168 * Note that this function leaks the various device name allocations on
169 * failure. The caller takes care of them.
170 */
171 STATIC int
xfs_parseargs(struct xfs_mount * mp,char * options)172 xfs_parseargs(
173 struct xfs_mount *mp,
174 char *options)
175 {
176 struct super_block *sb = mp->m_super;
177 char *this_char, *value;
178 int dsunit = 0;
179 int dswidth = 0;
180 int iosize = 0;
181 __uint8_t iosizelog = 0;
182
183 /*
184 * set up the mount name first so all the errors will refer to the
185 * correct device.
186 */
187 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
188 if (!mp->m_fsname)
189 return -ENOMEM;
190 mp->m_fsname_len = strlen(mp->m_fsname) + 1;
191
192 /*
193 * Copy binary VFS mount flags we are interested in.
194 */
195 if (sb->s_flags & MS_RDONLY)
196 mp->m_flags |= XFS_MOUNT_RDONLY;
197 if (sb->s_flags & MS_DIRSYNC)
198 mp->m_flags |= XFS_MOUNT_DIRSYNC;
199 if (sb->s_flags & MS_SYNCHRONOUS)
200 mp->m_flags |= XFS_MOUNT_WSYNC;
201
202 /*
203 * Set some default flags that could be cleared by the mount option
204 * parsing.
205 */
206 mp->m_flags |= XFS_MOUNT_BARRIER;
207 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
208
209 /*
210 * These can be overridden by the mount option parsing.
211 */
212 mp->m_logbufs = -1;
213 mp->m_logbsize = -1;
214
215 if (!options)
216 goto done;
217
218 while ((this_char = strsep(&options, ",")) != NULL) {
219 if (!*this_char)
220 continue;
221 if ((value = strchr(this_char, '=')) != NULL)
222 *value++ = 0;
223
224 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
225 if (!value || !*value) {
226 xfs_warn(mp, "%s option requires an argument",
227 this_char);
228 return -EINVAL;
229 }
230 if (kstrtoint(value, 10, &mp->m_logbufs))
231 return -EINVAL;
232 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
233 if (!value || !*value) {
234 xfs_warn(mp, "%s option requires an argument",
235 this_char);
236 return -EINVAL;
237 }
238 if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
239 return -EINVAL;
240 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
241 if (!value || !*value) {
242 xfs_warn(mp, "%s option requires an argument",
243 this_char);
244 return -EINVAL;
245 }
246 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
247 if (!mp->m_logname)
248 return -ENOMEM;
249 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
250 xfs_warn(mp, "%s option not allowed on this system",
251 this_char);
252 return -EINVAL;
253 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
254 if (!value || !*value) {
255 xfs_warn(mp, "%s option requires an argument",
256 this_char);
257 return -EINVAL;
258 }
259 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
260 if (!mp->m_rtname)
261 return -ENOMEM;
262 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
263 if (!value || !*value) {
264 xfs_warn(mp, "%s option requires an argument",
265 this_char);
266 return -EINVAL;
267 }
268 if (kstrtoint(value, 10, &iosize))
269 return -EINVAL;
270 iosizelog = ffs(iosize) - 1;
271 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
272 if (!value || !*value) {
273 xfs_warn(mp, "%s option requires an argument",
274 this_char);
275 return -EINVAL;
276 }
277 if (suffix_kstrtoint(value, 10, &iosize))
278 return -EINVAL;
279 iosizelog = ffs(iosize) - 1;
280 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
281 !strcmp(this_char, MNTOPT_BSDGROUPS)) {
282 mp->m_flags |= XFS_MOUNT_GRPID;
283 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
284 !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
285 mp->m_flags &= ~XFS_MOUNT_GRPID;
286 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
287 mp->m_flags |= XFS_MOUNT_WSYNC;
288 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
289 mp->m_flags |= XFS_MOUNT_NORECOVERY;
290 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
291 mp->m_flags |= XFS_MOUNT_NOALIGN;
292 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
293 mp->m_flags |= XFS_MOUNT_SWALLOC;
294 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
295 if (!value || !*value) {
296 xfs_warn(mp, "%s option requires an argument",
297 this_char);
298 return -EINVAL;
299 }
300 if (kstrtoint(value, 10, &dsunit))
301 return -EINVAL;
302 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
303 if (!value || !*value) {
304 xfs_warn(mp, "%s option requires an argument",
305 this_char);
306 return -EINVAL;
307 }
308 if (kstrtoint(value, 10, &dswidth))
309 return -EINVAL;
310 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
311 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
312 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
313 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
314 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
315 mp->m_flags |= XFS_MOUNT_NOUUID;
316 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
317 mp->m_flags |= XFS_MOUNT_BARRIER;
318 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
319 mp->m_flags &= ~XFS_MOUNT_BARRIER;
320 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
321 mp->m_flags |= XFS_MOUNT_IKEEP;
322 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
323 mp->m_flags &= ~XFS_MOUNT_IKEEP;
324 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
325 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
326 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
327 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
328 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
329 mp->m_flags |= XFS_MOUNT_ATTR2;
330 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
331 mp->m_flags &= ~XFS_MOUNT_ATTR2;
332 mp->m_flags |= XFS_MOUNT_NOATTR2;
333 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
334 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
335 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
336 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
337 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
338 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
339 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
340 !strcmp(this_char, MNTOPT_UQUOTA) ||
341 !strcmp(this_char, MNTOPT_USRQUOTA)) {
342 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
343 XFS_UQUOTA_ENFD);
344 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
345 !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
346 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
347 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
348 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
349 !strcmp(this_char, MNTOPT_PRJQUOTA)) {
350 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
351 XFS_PQUOTA_ENFD);
352 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
353 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
354 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
355 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
356 !strcmp(this_char, MNTOPT_GRPQUOTA)) {
357 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
358 XFS_GQUOTA_ENFD);
359 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
360 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
361 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
362 } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
363 mp->m_flags |= XFS_MOUNT_DISCARD;
364 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
365 mp->m_flags &= ~XFS_MOUNT_DISCARD;
366 } else {
367 xfs_warn(mp, "unknown mount option [%s].", this_char);
368 return -EINVAL;
369 }
370 }
371
372 /*
373 * no recovery flag requires a read-only mount
374 */
375 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
376 !(mp->m_flags & XFS_MOUNT_RDONLY)) {
377 xfs_warn(mp, "no-recovery mounts must be read-only.");
378 return -EINVAL;
379 }
380
381 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
382 xfs_warn(mp,
383 "sunit and swidth options incompatible with the noalign option");
384 return -EINVAL;
385 }
386
387 #ifndef CONFIG_XFS_QUOTA
388 if (XFS_IS_QUOTA_RUNNING(mp)) {
389 xfs_warn(mp, "quota support not available in this kernel.");
390 return -EINVAL;
391 }
392 #endif
393
394 if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
395 xfs_warn(mp, "sunit and swidth must be specified together");
396 return -EINVAL;
397 }
398
399 if (dsunit && (dswidth % dsunit != 0)) {
400 xfs_warn(mp,
401 "stripe width (%d) must be a multiple of the stripe unit (%d)",
402 dswidth, dsunit);
403 return -EINVAL;
404 }
405
406 done:
407 if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
408 /*
409 * At this point the superblock has not been read
410 * in, therefore we do not know the block size.
411 * Before the mount call ends we will convert
412 * these to FSBs.
413 */
414 mp->m_dalign = dsunit;
415 mp->m_swidth = dswidth;
416 }
417
418 if (mp->m_logbufs != -1 &&
419 mp->m_logbufs != 0 &&
420 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
421 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
422 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
423 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
424 return -EINVAL;
425 }
426 if (mp->m_logbsize != -1 &&
427 mp->m_logbsize != 0 &&
428 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
429 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
430 !is_power_of_2(mp->m_logbsize))) {
431 xfs_warn(mp,
432 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
433 mp->m_logbsize);
434 return -EINVAL;
435 }
436
437 if (iosizelog) {
438 if (iosizelog > XFS_MAX_IO_LOG ||
439 iosizelog < XFS_MIN_IO_LOG) {
440 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
441 iosizelog, XFS_MIN_IO_LOG,
442 XFS_MAX_IO_LOG);
443 return -EINVAL;
444 }
445
446 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
447 mp->m_readio_log = iosizelog;
448 mp->m_writeio_log = iosizelog;
449 }
450
451 return 0;
452 }
453
454 struct proc_xfs_info {
455 int flag;
456 char *str;
457 };
458
459 STATIC int
xfs_showargs(struct xfs_mount * mp,struct seq_file * m)460 xfs_showargs(
461 struct xfs_mount *mp,
462 struct seq_file *m)
463 {
464 static struct proc_xfs_info xfs_info_set[] = {
465 /* the few simple ones we can get from the mount struct */
466 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP },
467 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC },
468 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN },
469 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC },
470 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID },
471 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY },
472 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 },
473 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
474 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
475 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD },
476 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_32BITINODE },
477 { 0, NULL }
478 };
479 static struct proc_xfs_info xfs_info_unset[] = {
480 /* the few simple ones we can get from the mount struct */
481 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO },
482 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER },
483 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE },
484 { 0, NULL }
485 };
486 struct proc_xfs_info *xfs_infop;
487
488 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
489 if (mp->m_flags & xfs_infop->flag)
490 seq_puts(m, xfs_infop->str);
491 }
492 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
493 if (!(mp->m_flags & xfs_infop->flag))
494 seq_puts(m, xfs_infop->str);
495 }
496
497 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
498 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
499 (int)(1 << mp->m_writeio_log) >> 10);
500
501 if (mp->m_logbufs > 0)
502 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
503 if (mp->m_logbsize > 0)
504 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
505
506 if (mp->m_logname)
507 seq_show_option(m, MNTOPT_LOGDEV, mp->m_logname);
508 if (mp->m_rtname)
509 seq_show_option(m, MNTOPT_RTDEV, mp->m_rtname);
510
511 if (mp->m_dalign > 0)
512 seq_printf(m, "," MNTOPT_SUNIT "=%d",
513 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
514 if (mp->m_swidth > 0)
515 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
516 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
517
518 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
519 seq_puts(m, "," MNTOPT_USRQUOTA);
520 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
521 seq_puts(m, "," MNTOPT_UQUOTANOENF);
522
523 if (mp->m_qflags & XFS_PQUOTA_ACCT) {
524 if (mp->m_qflags & XFS_PQUOTA_ENFD)
525 seq_puts(m, "," MNTOPT_PRJQUOTA);
526 else
527 seq_puts(m, "," MNTOPT_PQUOTANOENF);
528 }
529 if (mp->m_qflags & XFS_GQUOTA_ACCT) {
530 if (mp->m_qflags & XFS_GQUOTA_ENFD)
531 seq_puts(m, "," MNTOPT_GRPQUOTA);
532 else
533 seq_puts(m, "," MNTOPT_GQUOTANOENF);
534 }
535
536 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
537 seq_puts(m, "," MNTOPT_NOQUOTA);
538
539 return 0;
540 }
541 __uint64_t
xfs_max_file_offset(unsigned int blockshift)542 xfs_max_file_offset(
543 unsigned int blockshift)
544 {
545 unsigned int pagefactor = 1;
546 unsigned int bitshift = BITS_PER_LONG - 1;
547
548 /* Figure out maximum filesize, on Linux this can depend on
549 * the filesystem blocksize (on 32 bit platforms).
550 * __block_write_begin does this in an [unsigned] long...
551 * page->index << (PAGE_CACHE_SHIFT - bbits)
552 * So, for page sized blocks (4K on 32 bit platforms),
553 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
554 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
555 * but for smaller blocksizes it is less (bbits = log2 bsize).
556 * Note1: get_block_t takes a long (implicit cast from above)
557 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
558 * can optionally convert the [unsigned] long from above into
559 * an [unsigned] long long.
560 */
561
562 #if BITS_PER_LONG == 32
563 # if defined(CONFIG_LBDAF)
564 ASSERT(sizeof(sector_t) == 8);
565 pagefactor = PAGE_CACHE_SIZE;
566 bitshift = BITS_PER_LONG;
567 # else
568 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
569 # endif
570 #endif
571
572 return (((__uint64_t)pagefactor) << bitshift) - 1;
573 }
574
575 /*
576 * xfs_set_inode32() and xfs_set_inode64() are passed an agcount
577 * because in the growfs case, mp->m_sb.sb_agcount is not updated
578 * yet to the potentially higher ag count.
579 */
580 xfs_agnumber_t
xfs_set_inode32(struct xfs_mount * mp,xfs_agnumber_t agcount)581 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount)
582 {
583 xfs_agnumber_t index = 0;
584 xfs_agnumber_t maxagi = 0;
585 xfs_sb_t *sbp = &mp->m_sb;
586 xfs_agnumber_t max_metadata;
587 xfs_agino_t agino;
588 xfs_ino_t ino;
589 xfs_perag_t *pag;
590
591 /* Calculate how much should be reserved for inodes to meet
592 * the max inode percentage.
593 */
594 if (mp->m_maxicount) {
595 __uint64_t icount;
596
597 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
598 do_div(icount, 100);
599 icount += sbp->sb_agblocks - 1;
600 do_div(icount, sbp->sb_agblocks);
601 max_metadata = icount;
602 } else {
603 max_metadata = agcount;
604 }
605
606 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
607
608 for (index = 0; index < agcount; index++) {
609 ino = XFS_AGINO_TO_INO(mp, index, agino);
610
611 if (ino > XFS_MAXINUMBER_32) {
612 pag = xfs_perag_get(mp, index);
613 pag->pagi_inodeok = 0;
614 pag->pagf_metadata = 0;
615 xfs_perag_put(pag);
616 continue;
617 }
618
619 pag = xfs_perag_get(mp, index);
620 pag->pagi_inodeok = 1;
621 maxagi++;
622 if (index < max_metadata)
623 pag->pagf_metadata = 1;
624 xfs_perag_put(pag);
625 }
626 mp->m_flags |= (XFS_MOUNT_32BITINODES |
627 XFS_MOUNT_SMALL_INUMS);
628
629 return maxagi;
630 }
631
632 xfs_agnumber_t
xfs_set_inode64(struct xfs_mount * mp,xfs_agnumber_t agcount)633 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount)
634 {
635 xfs_agnumber_t index = 0;
636
637 for (index = 0; index < agcount; index++) {
638 struct xfs_perag *pag;
639
640 pag = xfs_perag_get(mp, index);
641 pag->pagi_inodeok = 1;
642 pag->pagf_metadata = 0;
643 xfs_perag_put(pag);
644 }
645
646 /* There is no need for lock protection on m_flags,
647 * the rw_semaphore of the VFS superblock is locked
648 * during mount/umount/remount operations, so this is
649 * enough to avoid concurency on the m_flags field
650 */
651 mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
652 XFS_MOUNT_SMALL_INUMS);
653 return index;
654 }
655
656 STATIC int
xfs_blkdev_get(xfs_mount_t * mp,const char * name,struct block_device ** bdevp)657 xfs_blkdev_get(
658 xfs_mount_t *mp,
659 const char *name,
660 struct block_device **bdevp)
661 {
662 int error = 0;
663
664 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
665 mp);
666 if (IS_ERR(*bdevp)) {
667 error = PTR_ERR(*bdevp);
668 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
669 }
670
671 return error;
672 }
673
674 STATIC void
xfs_blkdev_put(struct block_device * bdev)675 xfs_blkdev_put(
676 struct block_device *bdev)
677 {
678 if (bdev)
679 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
680 }
681
682 void
xfs_blkdev_issue_flush(xfs_buftarg_t * buftarg)683 xfs_blkdev_issue_flush(
684 xfs_buftarg_t *buftarg)
685 {
686 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
687 }
688
689 STATIC void
xfs_close_devices(struct xfs_mount * mp)690 xfs_close_devices(
691 struct xfs_mount *mp)
692 {
693 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
694 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
695 xfs_free_buftarg(mp, mp->m_logdev_targp);
696 xfs_blkdev_put(logdev);
697 }
698 if (mp->m_rtdev_targp) {
699 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
700 xfs_free_buftarg(mp, mp->m_rtdev_targp);
701 xfs_blkdev_put(rtdev);
702 }
703 xfs_free_buftarg(mp, mp->m_ddev_targp);
704 }
705
706 /*
707 * The file system configurations are:
708 * (1) device (partition) with data and internal log
709 * (2) logical volume with data and log subvolumes.
710 * (3) logical volume with data, log, and realtime subvolumes.
711 *
712 * We only have to handle opening the log and realtime volumes here if
713 * they are present. The data subvolume has already been opened by
714 * get_sb_bdev() and is stored in sb->s_bdev.
715 */
716 STATIC int
xfs_open_devices(struct xfs_mount * mp)717 xfs_open_devices(
718 struct xfs_mount *mp)
719 {
720 struct block_device *ddev = mp->m_super->s_bdev;
721 struct block_device *logdev = NULL, *rtdev = NULL;
722 int error;
723
724 /*
725 * Open real time and log devices - order is important.
726 */
727 if (mp->m_logname) {
728 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
729 if (error)
730 goto out;
731 }
732
733 if (mp->m_rtname) {
734 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
735 if (error)
736 goto out_close_logdev;
737
738 if (rtdev == ddev || rtdev == logdev) {
739 xfs_warn(mp,
740 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
741 error = -EINVAL;
742 goto out_close_rtdev;
743 }
744 }
745
746 /*
747 * Setup xfs_mount buffer target pointers
748 */
749 error = -ENOMEM;
750 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
751 if (!mp->m_ddev_targp)
752 goto out_close_rtdev;
753
754 if (rtdev) {
755 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
756 if (!mp->m_rtdev_targp)
757 goto out_free_ddev_targ;
758 }
759
760 if (logdev && logdev != ddev) {
761 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
762 if (!mp->m_logdev_targp)
763 goto out_free_rtdev_targ;
764 } else {
765 mp->m_logdev_targp = mp->m_ddev_targp;
766 }
767
768 return 0;
769
770 out_free_rtdev_targ:
771 if (mp->m_rtdev_targp)
772 xfs_free_buftarg(mp, mp->m_rtdev_targp);
773 out_free_ddev_targ:
774 xfs_free_buftarg(mp, mp->m_ddev_targp);
775 out_close_rtdev:
776 xfs_blkdev_put(rtdev);
777 out_close_logdev:
778 if (logdev && logdev != ddev)
779 xfs_blkdev_put(logdev);
780 out:
781 return error;
782 }
783
784 /*
785 * Setup xfs_mount buffer target pointers based on superblock
786 */
787 STATIC int
xfs_setup_devices(struct xfs_mount * mp)788 xfs_setup_devices(
789 struct xfs_mount *mp)
790 {
791 int error;
792
793 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
794 if (error)
795 return error;
796
797 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
798 unsigned int log_sector_size = BBSIZE;
799
800 if (xfs_sb_version_hassector(&mp->m_sb))
801 log_sector_size = mp->m_sb.sb_logsectsize;
802 error = xfs_setsize_buftarg(mp->m_logdev_targp,
803 log_sector_size);
804 if (error)
805 return error;
806 }
807 if (mp->m_rtdev_targp) {
808 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
809 mp->m_sb.sb_sectsize);
810 if (error)
811 return error;
812 }
813
814 return 0;
815 }
816
817 STATIC int
xfs_init_mount_workqueues(struct xfs_mount * mp)818 xfs_init_mount_workqueues(
819 struct xfs_mount *mp)
820 {
821 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
822 WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
823 if (!mp->m_buf_workqueue)
824 goto out;
825
826 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
827 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
828 if (!mp->m_data_workqueue)
829 goto out_destroy_buf;
830
831 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
832 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
833 if (!mp->m_unwritten_workqueue)
834 goto out_destroy_data_iodone_queue;
835
836 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
837 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
838 if (!mp->m_cil_workqueue)
839 goto out_destroy_unwritten;
840
841 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
842 WQ_FREEZABLE, 0, mp->m_fsname);
843 if (!mp->m_reclaim_workqueue)
844 goto out_destroy_cil;
845
846 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
847 WQ_FREEZABLE|WQ_HIGHPRI, 0, mp->m_fsname);
848 if (!mp->m_log_workqueue)
849 goto out_destroy_reclaim;
850
851 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
852 WQ_FREEZABLE, 0, mp->m_fsname);
853 if (!mp->m_eofblocks_workqueue)
854 goto out_destroy_log;
855
856 return 0;
857
858 out_destroy_log:
859 destroy_workqueue(mp->m_log_workqueue);
860 out_destroy_reclaim:
861 destroy_workqueue(mp->m_reclaim_workqueue);
862 out_destroy_cil:
863 destroy_workqueue(mp->m_cil_workqueue);
864 out_destroy_unwritten:
865 destroy_workqueue(mp->m_unwritten_workqueue);
866 out_destroy_data_iodone_queue:
867 destroy_workqueue(mp->m_data_workqueue);
868 out_destroy_buf:
869 destroy_workqueue(mp->m_buf_workqueue);
870 out:
871 return -ENOMEM;
872 }
873
874 STATIC void
xfs_destroy_mount_workqueues(struct xfs_mount * mp)875 xfs_destroy_mount_workqueues(
876 struct xfs_mount *mp)
877 {
878 destroy_workqueue(mp->m_eofblocks_workqueue);
879 destroy_workqueue(mp->m_log_workqueue);
880 destroy_workqueue(mp->m_reclaim_workqueue);
881 destroy_workqueue(mp->m_cil_workqueue);
882 destroy_workqueue(mp->m_data_workqueue);
883 destroy_workqueue(mp->m_unwritten_workqueue);
884 destroy_workqueue(mp->m_buf_workqueue);
885 }
886
887 /*
888 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
889 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
890 * for IO to complete so that we effectively throttle multiple callers to the
891 * rate at which IO is completing.
892 */
893 void
xfs_flush_inodes(struct xfs_mount * mp)894 xfs_flush_inodes(
895 struct xfs_mount *mp)
896 {
897 struct super_block *sb = mp->m_super;
898
899 if (down_read_trylock(&sb->s_umount)) {
900 sync_inodes_sb(sb);
901 up_read(&sb->s_umount);
902 }
903 }
904
905 /* Catch misguided souls that try to use this interface on XFS */
906 STATIC struct inode *
xfs_fs_alloc_inode(struct super_block * sb)907 xfs_fs_alloc_inode(
908 struct super_block *sb)
909 {
910 BUG();
911 return NULL;
912 }
913
914 /*
915 * Now that the generic code is guaranteed not to be accessing
916 * the linux inode, we can reclaim the inode.
917 */
918 STATIC void
xfs_fs_destroy_inode(struct inode * inode)919 xfs_fs_destroy_inode(
920 struct inode *inode)
921 {
922 struct xfs_inode *ip = XFS_I(inode);
923
924 trace_xfs_destroy_inode(ip);
925
926 XFS_STATS_INC(vn_reclaim);
927
928 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
929
930 /*
931 * We should never get here with one of the reclaim flags already set.
932 */
933 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
934 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
935
936 /*
937 * We always use background reclaim here because even if the
938 * inode is clean, it still may be under IO and hence we have
939 * to take the flush lock. The background reclaim path handles
940 * this more efficiently than we can here, so simply let background
941 * reclaim tear down all inodes.
942 */
943 xfs_inode_set_reclaim_tag(ip);
944 }
945
946 /*
947 * Slab object creation initialisation for the XFS inode.
948 * This covers only the idempotent fields in the XFS inode;
949 * all other fields need to be initialised on allocation
950 * from the slab. This avoids the need to repeatedly initialise
951 * fields in the xfs inode that left in the initialise state
952 * when freeing the inode.
953 */
954 STATIC void
xfs_fs_inode_init_once(void * inode)955 xfs_fs_inode_init_once(
956 void *inode)
957 {
958 struct xfs_inode *ip = inode;
959
960 memset(ip, 0, sizeof(struct xfs_inode));
961
962 /* vfs inode */
963 inode_init_once(VFS_I(ip));
964
965 /* xfs inode */
966 atomic_set(&ip->i_pincount, 0);
967 spin_lock_init(&ip->i_flags_lock);
968
969 mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
970 "xfsino", ip->i_ino);
971 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
972 "xfsino", ip->i_ino);
973 }
974
975 STATIC void
xfs_fs_evict_inode(struct inode * inode)976 xfs_fs_evict_inode(
977 struct inode *inode)
978 {
979 xfs_inode_t *ip = XFS_I(inode);
980
981 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
982
983 trace_xfs_evict_inode(ip);
984
985 truncate_inode_pages_final(&inode->i_data);
986 clear_inode(inode);
987 XFS_STATS_INC(vn_rele);
988 XFS_STATS_INC(vn_remove);
989
990 xfs_inactive(ip);
991 }
992
993 /*
994 * We do an unlocked check for XFS_IDONTCACHE here because we are already
995 * serialised against cache hits here via the inode->i_lock and igrab() in
996 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
997 * racing with us, and it avoids needing to grab a spinlock here for every inode
998 * we drop the final reference on.
999 */
1000 STATIC int
xfs_fs_drop_inode(struct inode * inode)1001 xfs_fs_drop_inode(
1002 struct inode *inode)
1003 {
1004 struct xfs_inode *ip = XFS_I(inode);
1005
1006 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1007 }
1008
1009 STATIC void
xfs_free_fsname(struct xfs_mount * mp)1010 xfs_free_fsname(
1011 struct xfs_mount *mp)
1012 {
1013 kfree(mp->m_fsname);
1014 kfree(mp->m_rtname);
1015 kfree(mp->m_logname);
1016 }
1017
1018 STATIC int
xfs_fs_sync_fs(struct super_block * sb,int wait)1019 xfs_fs_sync_fs(
1020 struct super_block *sb,
1021 int wait)
1022 {
1023 struct xfs_mount *mp = XFS_M(sb);
1024
1025 /*
1026 * Doing anything during the async pass would be counterproductive.
1027 */
1028 if (!wait)
1029 return 0;
1030
1031 xfs_log_force(mp, XFS_LOG_SYNC);
1032 if (laptop_mode) {
1033 /*
1034 * The disk must be active because we're syncing.
1035 * We schedule log work now (now that the disk is
1036 * active) instead of later (when it might not be).
1037 */
1038 flush_delayed_work(&mp->m_log->l_work);
1039 }
1040
1041 return 0;
1042 }
1043
1044 STATIC int
xfs_fs_statfs(struct dentry * dentry,struct kstatfs * statp)1045 xfs_fs_statfs(
1046 struct dentry *dentry,
1047 struct kstatfs *statp)
1048 {
1049 struct xfs_mount *mp = XFS_M(dentry->d_sb);
1050 xfs_sb_t *sbp = &mp->m_sb;
1051 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1052 __uint64_t fakeinos, id;
1053 __uint64_t icount;
1054 __uint64_t ifree;
1055 __uint64_t fdblocks;
1056 xfs_extlen_t lsize;
1057 __int64_t ffree;
1058
1059 statp->f_type = XFS_SB_MAGIC;
1060 statp->f_namelen = MAXNAMELEN - 1;
1061
1062 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1063 statp->f_fsid.val[0] = (u32)id;
1064 statp->f_fsid.val[1] = (u32)(id >> 32);
1065
1066 icount = percpu_counter_sum(&mp->m_icount);
1067 ifree = percpu_counter_sum(&mp->m_ifree);
1068 fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1069
1070 spin_lock(&mp->m_sb_lock);
1071 statp->f_bsize = sbp->sb_blocksize;
1072 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1073 statp->f_blocks = sbp->sb_dblocks - lsize;
1074 spin_unlock(&mp->m_sb_lock);
1075
1076 statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1077 statp->f_bavail = statp->f_bfree;
1078
1079 fakeinos = statp->f_bfree << sbp->sb_inopblog;
1080 statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1081 if (mp->m_maxicount)
1082 statp->f_files = min_t(typeof(statp->f_files),
1083 statp->f_files,
1084 mp->m_maxicount);
1085
1086 /* If sb_icount overshot maxicount, report actual allocation */
1087 statp->f_files = max_t(typeof(statp->f_files),
1088 statp->f_files,
1089 sbp->sb_icount);
1090
1091 /* make sure statp->f_ffree does not underflow */
1092 ffree = statp->f_files - (icount - ifree);
1093 statp->f_ffree = max_t(__int64_t, ffree, 0);
1094
1095
1096 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1097 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1098 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1099 xfs_qm_statvfs(ip, statp);
1100 return 0;
1101 }
1102
1103 STATIC void
xfs_save_resvblks(struct xfs_mount * mp)1104 xfs_save_resvblks(struct xfs_mount *mp)
1105 {
1106 __uint64_t resblks = 0;
1107
1108 mp->m_resblks_save = mp->m_resblks;
1109 xfs_reserve_blocks(mp, &resblks, NULL);
1110 }
1111
1112 STATIC void
xfs_restore_resvblks(struct xfs_mount * mp)1113 xfs_restore_resvblks(struct xfs_mount *mp)
1114 {
1115 __uint64_t resblks;
1116
1117 if (mp->m_resblks_save) {
1118 resblks = mp->m_resblks_save;
1119 mp->m_resblks_save = 0;
1120 } else
1121 resblks = xfs_default_resblks(mp);
1122
1123 xfs_reserve_blocks(mp, &resblks, NULL);
1124 }
1125
1126 /*
1127 * Trigger writeback of all the dirty metadata in the file system.
1128 *
1129 * This ensures that the metadata is written to their location on disk rather
1130 * than just existing in transactions in the log. This means after a quiesce
1131 * there is no log replay required to write the inodes to disk - this is the
1132 * primary difference between a sync and a quiesce.
1133 *
1134 * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1135 * it is started again when appropriate.
1136 */
1137 static void
xfs_quiesce_attr(struct xfs_mount * mp)1138 xfs_quiesce_attr(
1139 struct xfs_mount *mp)
1140 {
1141 int error = 0;
1142
1143 /* wait for all modifications to complete */
1144 while (atomic_read(&mp->m_active_trans) > 0)
1145 delay(100);
1146
1147 /* force the log to unpin objects from the now complete transactions */
1148 xfs_log_force(mp, XFS_LOG_SYNC);
1149
1150 /* reclaim inodes to do any IO before the freeze completes */
1151 xfs_reclaim_inodes(mp, 0);
1152 xfs_reclaim_inodes(mp, SYNC_WAIT);
1153
1154 /* Push the superblock and write an unmount record */
1155 error = xfs_log_sbcount(mp);
1156 if (error)
1157 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1158 "Frozen image may not be consistent.");
1159 /*
1160 * Just warn here till VFS can correctly support
1161 * read-only remount without racing.
1162 */
1163 WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1164
1165 xfs_log_quiesce(mp);
1166 }
1167
1168 STATIC int
xfs_fs_remount(struct super_block * sb,int * flags,char * options)1169 xfs_fs_remount(
1170 struct super_block *sb,
1171 int *flags,
1172 char *options)
1173 {
1174 struct xfs_mount *mp = XFS_M(sb);
1175 xfs_sb_t *sbp = &mp->m_sb;
1176 substring_t args[MAX_OPT_ARGS];
1177 char *p;
1178 int error;
1179
1180 sync_filesystem(sb);
1181 while ((p = strsep(&options, ",")) != NULL) {
1182 int token;
1183
1184 if (!*p)
1185 continue;
1186
1187 token = match_token(p, tokens, args);
1188 switch (token) {
1189 case Opt_barrier:
1190 mp->m_flags |= XFS_MOUNT_BARRIER;
1191 break;
1192 case Opt_nobarrier:
1193 mp->m_flags &= ~XFS_MOUNT_BARRIER;
1194 break;
1195 case Opt_inode64:
1196 mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount);
1197 break;
1198 case Opt_inode32:
1199 mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount);
1200 break;
1201 default:
1202 /*
1203 * Logically we would return an error here to prevent
1204 * users from believing they might have changed
1205 * mount options using remount which can't be changed.
1206 *
1207 * But unfortunately mount(8) adds all options from
1208 * mtab and fstab to the mount arguments in some cases
1209 * so we can't blindly reject options, but have to
1210 * check for each specified option if it actually
1211 * differs from the currently set option and only
1212 * reject it if that's the case.
1213 *
1214 * Until that is implemented we return success for
1215 * every remount request, and silently ignore all
1216 * options that we can't actually change.
1217 */
1218 #if 0
1219 xfs_info(mp,
1220 "mount option \"%s\" not supported for remount", p);
1221 return -EINVAL;
1222 #else
1223 break;
1224 #endif
1225 }
1226 }
1227
1228 /* ro -> rw */
1229 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1230 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1231 xfs_warn(mp,
1232 "ro->rw transition prohibited on norecovery mount");
1233 return -EINVAL;
1234 }
1235
1236 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1237 xfs_sb_has_ro_compat_feature(sbp,
1238 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1239 xfs_warn(mp,
1240 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1241 (sbp->sb_features_ro_compat &
1242 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1243 return -EINVAL;
1244 }
1245
1246 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1247
1248 /*
1249 * If this is the first remount to writeable state we
1250 * might have some superblock changes to update.
1251 */
1252 if (mp->m_update_sb) {
1253 error = xfs_sync_sb(mp, false);
1254 if (error) {
1255 xfs_warn(mp, "failed to write sb changes");
1256 return error;
1257 }
1258 mp->m_update_sb = false;
1259 }
1260
1261 /*
1262 * Fill out the reserve pool if it is empty. Use the stashed
1263 * value if it is non-zero, otherwise go with the default.
1264 */
1265 xfs_restore_resvblks(mp);
1266 xfs_log_work_queue(mp);
1267 }
1268
1269 /* rw -> ro */
1270 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1271 /*
1272 * Before we sync the metadata, we need to free up the reserve
1273 * block pool so that the used block count in the superblock on
1274 * disk is correct at the end of the remount. Stash the current
1275 * reserve pool size so that if we get remounted rw, we can
1276 * return it to the same size.
1277 */
1278 xfs_save_resvblks(mp);
1279 xfs_quiesce_attr(mp);
1280 mp->m_flags |= XFS_MOUNT_RDONLY;
1281 }
1282
1283 return 0;
1284 }
1285
1286 /*
1287 * Second stage of a freeze. The data is already frozen so we only
1288 * need to take care of the metadata. Once that's done sync the superblock
1289 * to the log to dirty it in case of a crash while frozen. This ensures that we
1290 * will recover the unlinked inode lists on the next mount.
1291 */
1292 STATIC int
xfs_fs_freeze(struct super_block * sb)1293 xfs_fs_freeze(
1294 struct super_block *sb)
1295 {
1296 struct xfs_mount *mp = XFS_M(sb);
1297
1298 xfs_save_resvblks(mp);
1299 xfs_quiesce_attr(mp);
1300 return xfs_sync_sb(mp, true);
1301 }
1302
1303 STATIC int
xfs_fs_unfreeze(struct super_block * sb)1304 xfs_fs_unfreeze(
1305 struct super_block *sb)
1306 {
1307 struct xfs_mount *mp = XFS_M(sb);
1308
1309 xfs_restore_resvblks(mp);
1310 xfs_log_work_queue(mp);
1311 return 0;
1312 }
1313
1314 STATIC int
xfs_fs_show_options(struct seq_file * m,struct dentry * root)1315 xfs_fs_show_options(
1316 struct seq_file *m,
1317 struct dentry *root)
1318 {
1319 return xfs_showargs(XFS_M(root->d_sb), m);
1320 }
1321
1322 /*
1323 * This function fills in xfs_mount_t fields based on mount args.
1324 * Note: the superblock _has_ now been read in.
1325 */
1326 STATIC int
xfs_finish_flags(struct xfs_mount * mp)1327 xfs_finish_flags(
1328 struct xfs_mount *mp)
1329 {
1330 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1331
1332 /* Fail a mount where the logbuf is smaller than the log stripe */
1333 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1334 if (mp->m_logbsize <= 0 &&
1335 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1336 mp->m_logbsize = mp->m_sb.sb_logsunit;
1337 } else if (mp->m_logbsize > 0 &&
1338 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1339 xfs_warn(mp,
1340 "logbuf size must be greater than or equal to log stripe size");
1341 return -EINVAL;
1342 }
1343 } else {
1344 /* Fail a mount if the logbuf is larger than 32K */
1345 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1346 xfs_warn(mp,
1347 "logbuf size for version 1 logs must be 16K or 32K");
1348 return -EINVAL;
1349 }
1350 }
1351
1352 /*
1353 * V5 filesystems always use attr2 format for attributes.
1354 */
1355 if (xfs_sb_version_hascrc(&mp->m_sb) &&
1356 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1357 xfs_warn(mp,
1358 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1359 MNTOPT_NOATTR2, MNTOPT_ATTR2);
1360 return -EINVAL;
1361 }
1362
1363 /*
1364 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1365 * told by noattr2 to turn it off
1366 */
1367 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1368 !(mp->m_flags & XFS_MOUNT_NOATTR2))
1369 mp->m_flags |= XFS_MOUNT_ATTR2;
1370
1371 /*
1372 * prohibit r/w mounts of read-only filesystems
1373 */
1374 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1375 xfs_warn(mp,
1376 "cannot mount a read-only filesystem as read-write");
1377 return -EROFS;
1378 }
1379
1380 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1381 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1382 !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1383 xfs_warn(mp,
1384 "Super block does not support project and group quota together");
1385 return -EINVAL;
1386 }
1387
1388 return 0;
1389 }
1390
1391 static int
xfs_init_percpu_counters(struct xfs_mount * mp)1392 xfs_init_percpu_counters(
1393 struct xfs_mount *mp)
1394 {
1395 int error;
1396
1397 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1398 if (error)
1399 return -ENOMEM;
1400
1401 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1402 if (error)
1403 goto free_icount;
1404
1405 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1406 if (error)
1407 goto free_ifree;
1408
1409 return 0;
1410
1411 free_ifree:
1412 percpu_counter_destroy(&mp->m_ifree);
1413 free_icount:
1414 percpu_counter_destroy(&mp->m_icount);
1415 return -ENOMEM;
1416 }
1417
1418 void
xfs_reinit_percpu_counters(struct xfs_mount * mp)1419 xfs_reinit_percpu_counters(
1420 struct xfs_mount *mp)
1421 {
1422 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1423 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1424 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1425 }
1426
1427 static void
xfs_destroy_percpu_counters(struct xfs_mount * mp)1428 xfs_destroy_percpu_counters(
1429 struct xfs_mount *mp)
1430 {
1431 percpu_counter_destroy(&mp->m_icount);
1432 percpu_counter_destroy(&mp->m_ifree);
1433 percpu_counter_destroy(&mp->m_fdblocks);
1434 }
1435
1436 STATIC int
xfs_fs_fill_super(struct super_block * sb,void * data,int silent)1437 xfs_fs_fill_super(
1438 struct super_block *sb,
1439 void *data,
1440 int silent)
1441 {
1442 struct inode *root;
1443 struct xfs_mount *mp = NULL;
1444 int flags = 0, error = -ENOMEM;
1445
1446 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1447 if (!mp)
1448 goto out;
1449
1450 spin_lock_init(&mp->m_sb_lock);
1451 mutex_init(&mp->m_growlock);
1452 atomic_set(&mp->m_active_trans, 0);
1453 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1454 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1455 mp->m_kobj.kobject.kset = xfs_kset;
1456
1457 mp->m_super = sb;
1458 sb->s_fs_info = mp;
1459
1460 error = xfs_parseargs(mp, (char *)data);
1461 if (error)
1462 goto out_free_fsname;
1463
1464 sb_min_blocksize(sb, BBSIZE);
1465 sb->s_xattr = xfs_xattr_handlers;
1466 sb->s_export_op = &xfs_export_operations;
1467 #ifdef CONFIG_XFS_QUOTA
1468 sb->s_qcop = &xfs_quotactl_operations;
1469 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1470 #endif
1471 sb->s_op = &xfs_super_operations;
1472
1473 if (silent)
1474 flags |= XFS_MFSI_QUIET;
1475
1476 error = xfs_open_devices(mp);
1477 if (error)
1478 goto out_free_fsname;
1479
1480 error = xfs_init_mount_workqueues(mp);
1481 if (error)
1482 goto out_close_devices;
1483
1484 error = xfs_init_percpu_counters(mp);
1485 if (error)
1486 goto out_destroy_workqueues;
1487
1488 error = xfs_readsb(mp, flags);
1489 if (error)
1490 goto out_destroy_counters;
1491
1492 error = xfs_finish_flags(mp);
1493 if (error)
1494 goto out_free_sb;
1495
1496 error = xfs_setup_devices(mp);
1497 if (error)
1498 goto out_free_sb;
1499
1500 error = xfs_filestream_mount(mp);
1501 if (error)
1502 goto out_free_sb;
1503
1504 /*
1505 * we must configure the block size in the superblock before we run the
1506 * full mount process as the mount process can lookup and cache inodes.
1507 */
1508 sb->s_magic = XFS_SB_MAGIC;
1509 sb->s_blocksize = mp->m_sb.sb_blocksize;
1510 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1511 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1512 sb->s_max_links = XFS_MAXLINK;
1513 sb->s_time_gran = 1;
1514 set_posix_acl_flag(sb);
1515
1516 /* version 5 superblocks support inode version counters. */
1517 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1518 sb->s_flags |= MS_I_VERSION;
1519
1520 error = xfs_mountfs(mp);
1521 if (error)
1522 goto out_filestream_unmount;
1523
1524 root = igrab(VFS_I(mp->m_rootip));
1525 if (!root) {
1526 error = -ENOENT;
1527 goto out_unmount;
1528 }
1529 sb->s_root = d_make_root(root);
1530 if (!sb->s_root) {
1531 error = -ENOMEM;
1532 goto out_unmount;
1533 }
1534
1535 return 0;
1536
1537 out_filestream_unmount:
1538 xfs_filestream_unmount(mp);
1539 out_free_sb:
1540 xfs_freesb(mp);
1541 out_destroy_counters:
1542 xfs_destroy_percpu_counters(mp);
1543 out_destroy_workqueues:
1544 xfs_destroy_mount_workqueues(mp);
1545 out_close_devices:
1546 xfs_close_devices(mp);
1547 out_free_fsname:
1548 xfs_free_fsname(mp);
1549 kfree(mp);
1550 out:
1551 return error;
1552
1553 out_unmount:
1554 xfs_filestream_unmount(mp);
1555 xfs_unmountfs(mp);
1556 goto out_free_sb;
1557 }
1558
1559 STATIC void
xfs_fs_put_super(struct super_block * sb)1560 xfs_fs_put_super(
1561 struct super_block *sb)
1562 {
1563 struct xfs_mount *mp = XFS_M(sb);
1564
1565 xfs_notice(mp, "Unmounting Filesystem");
1566 xfs_filestream_unmount(mp);
1567 xfs_unmountfs(mp);
1568
1569 xfs_freesb(mp);
1570 xfs_destroy_percpu_counters(mp);
1571 xfs_destroy_mount_workqueues(mp);
1572 xfs_close_devices(mp);
1573 xfs_free_fsname(mp);
1574 kfree(mp);
1575 }
1576
1577 STATIC struct dentry *
xfs_fs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)1578 xfs_fs_mount(
1579 struct file_system_type *fs_type,
1580 int flags,
1581 const char *dev_name,
1582 void *data)
1583 {
1584 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1585 }
1586
1587 static long
xfs_fs_nr_cached_objects(struct super_block * sb,struct shrink_control * sc)1588 xfs_fs_nr_cached_objects(
1589 struct super_block *sb,
1590 struct shrink_control *sc)
1591 {
1592 return xfs_reclaim_inodes_count(XFS_M(sb));
1593 }
1594
1595 static long
xfs_fs_free_cached_objects(struct super_block * sb,struct shrink_control * sc)1596 xfs_fs_free_cached_objects(
1597 struct super_block *sb,
1598 struct shrink_control *sc)
1599 {
1600 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1601 }
1602
1603 static const struct super_operations xfs_super_operations = {
1604 .alloc_inode = xfs_fs_alloc_inode,
1605 .destroy_inode = xfs_fs_destroy_inode,
1606 .evict_inode = xfs_fs_evict_inode,
1607 .drop_inode = xfs_fs_drop_inode,
1608 .put_super = xfs_fs_put_super,
1609 .sync_fs = xfs_fs_sync_fs,
1610 .freeze_fs = xfs_fs_freeze,
1611 .unfreeze_fs = xfs_fs_unfreeze,
1612 .statfs = xfs_fs_statfs,
1613 .remount_fs = xfs_fs_remount,
1614 .show_options = xfs_fs_show_options,
1615 .nr_cached_objects = xfs_fs_nr_cached_objects,
1616 .free_cached_objects = xfs_fs_free_cached_objects,
1617 };
1618
1619 static struct file_system_type xfs_fs_type = {
1620 .owner = THIS_MODULE,
1621 .name = "xfs",
1622 .mount = xfs_fs_mount,
1623 .kill_sb = kill_block_super,
1624 .fs_flags = FS_REQUIRES_DEV,
1625 };
1626 MODULE_ALIAS_FS("xfs");
1627
1628 STATIC int __init
xfs_init_zones(void)1629 xfs_init_zones(void)
1630 {
1631
1632 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1633 if (!xfs_ioend_zone)
1634 goto out;
1635
1636 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1637 xfs_ioend_zone);
1638 if (!xfs_ioend_pool)
1639 goto out_destroy_ioend_zone;
1640
1641 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1642 "xfs_log_ticket");
1643 if (!xfs_log_ticket_zone)
1644 goto out_destroy_ioend_pool;
1645
1646 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1647 "xfs_bmap_free_item");
1648 if (!xfs_bmap_free_item_zone)
1649 goto out_destroy_log_ticket_zone;
1650
1651 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1652 "xfs_btree_cur");
1653 if (!xfs_btree_cur_zone)
1654 goto out_destroy_bmap_free_item_zone;
1655
1656 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1657 "xfs_da_state");
1658 if (!xfs_da_state_zone)
1659 goto out_destroy_btree_cur_zone;
1660
1661 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1662 if (!xfs_ifork_zone)
1663 goto out_destroy_da_state_zone;
1664
1665 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1666 if (!xfs_trans_zone)
1667 goto out_destroy_ifork_zone;
1668
1669 xfs_log_item_desc_zone =
1670 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1671 "xfs_log_item_desc");
1672 if (!xfs_log_item_desc_zone)
1673 goto out_destroy_trans_zone;
1674
1675 /*
1676 * The size of the zone allocated buf log item is the maximum
1677 * size possible under XFS. This wastes a little bit of memory,
1678 * but it is much faster.
1679 */
1680 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1681 "xfs_buf_item");
1682 if (!xfs_buf_item_zone)
1683 goto out_destroy_log_item_desc_zone;
1684
1685 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1686 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1687 sizeof(xfs_extent_t))), "xfs_efd_item");
1688 if (!xfs_efd_zone)
1689 goto out_destroy_buf_item_zone;
1690
1691 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1692 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1693 sizeof(xfs_extent_t))), "xfs_efi_item");
1694 if (!xfs_efi_zone)
1695 goto out_destroy_efd_zone;
1696
1697 xfs_inode_zone =
1698 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1699 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1700 xfs_fs_inode_init_once);
1701 if (!xfs_inode_zone)
1702 goto out_destroy_efi_zone;
1703
1704 xfs_ili_zone =
1705 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1706 KM_ZONE_SPREAD, NULL);
1707 if (!xfs_ili_zone)
1708 goto out_destroy_inode_zone;
1709 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1710 "xfs_icr");
1711 if (!xfs_icreate_zone)
1712 goto out_destroy_ili_zone;
1713
1714 return 0;
1715
1716 out_destroy_ili_zone:
1717 kmem_zone_destroy(xfs_ili_zone);
1718 out_destroy_inode_zone:
1719 kmem_zone_destroy(xfs_inode_zone);
1720 out_destroy_efi_zone:
1721 kmem_zone_destroy(xfs_efi_zone);
1722 out_destroy_efd_zone:
1723 kmem_zone_destroy(xfs_efd_zone);
1724 out_destroy_buf_item_zone:
1725 kmem_zone_destroy(xfs_buf_item_zone);
1726 out_destroy_log_item_desc_zone:
1727 kmem_zone_destroy(xfs_log_item_desc_zone);
1728 out_destroy_trans_zone:
1729 kmem_zone_destroy(xfs_trans_zone);
1730 out_destroy_ifork_zone:
1731 kmem_zone_destroy(xfs_ifork_zone);
1732 out_destroy_da_state_zone:
1733 kmem_zone_destroy(xfs_da_state_zone);
1734 out_destroy_btree_cur_zone:
1735 kmem_zone_destroy(xfs_btree_cur_zone);
1736 out_destroy_bmap_free_item_zone:
1737 kmem_zone_destroy(xfs_bmap_free_item_zone);
1738 out_destroy_log_ticket_zone:
1739 kmem_zone_destroy(xfs_log_ticket_zone);
1740 out_destroy_ioend_pool:
1741 mempool_destroy(xfs_ioend_pool);
1742 out_destroy_ioend_zone:
1743 kmem_zone_destroy(xfs_ioend_zone);
1744 out:
1745 return -ENOMEM;
1746 }
1747
1748 STATIC void
xfs_destroy_zones(void)1749 xfs_destroy_zones(void)
1750 {
1751 /*
1752 * Make sure all delayed rcu free are flushed before we
1753 * destroy caches.
1754 */
1755 rcu_barrier();
1756 kmem_zone_destroy(xfs_icreate_zone);
1757 kmem_zone_destroy(xfs_ili_zone);
1758 kmem_zone_destroy(xfs_inode_zone);
1759 kmem_zone_destroy(xfs_efi_zone);
1760 kmem_zone_destroy(xfs_efd_zone);
1761 kmem_zone_destroy(xfs_buf_item_zone);
1762 kmem_zone_destroy(xfs_log_item_desc_zone);
1763 kmem_zone_destroy(xfs_trans_zone);
1764 kmem_zone_destroy(xfs_ifork_zone);
1765 kmem_zone_destroy(xfs_da_state_zone);
1766 kmem_zone_destroy(xfs_btree_cur_zone);
1767 kmem_zone_destroy(xfs_bmap_free_item_zone);
1768 kmem_zone_destroy(xfs_log_ticket_zone);
1769 mempool_destroy(xfs_ioend_pool);
1770 kmem_zone_destroy(xfs_ioend_zone);
1771
1772 }
1773
1774 STATIC int __init
xfs_init_workqueues(void)1775 xfs_init_workqueues(void)
1776 {
1777 /*
1778 * The allocation workqueue can be used in memory reclaim situations
1779 * (writepage path), and parallelism is only limited by the number of
1780 * AGs in all the filesystems mounted. Hence use the default large
1781 * max_active value for this workqueue.
1782 */
1783 xfs_alloc_wq = alloc_workqueue("xfsalloc",
1784 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1785 if (!xfs_alloc_wq)
1786 return -ENOMEM;
1787
1788 return 0;
1789 }
1790
1791 STATIC void
xfs_destroy_workqueues(void)1792 xfs_destroy_workqueues(void)
1793 {
1794 destroy_workqueue(xfs_alloc_wq);
1795 }
1796
1797 STATIC int __init
init_xfs_fs(void)1798 init_xfs_fs(void)
1799 {
1800 int error;
1801
1802 printk(KERN_INFO XFS_VERSION_STRING " with "
1803 XFS_BUILD_OPTIONS " enabled\n");
1804
1805 xfs_dir_startup();
1806
1807 error = xfs_init_zones();
1808 if (error)
1809 goto out;
1810
1811 error = xfs_init_workqueues();
1812 if (error)
1813 goto out_destroy_zones;
1814
1815 error = xfs_mru_cache_init();
1816 if (error)
1817 goto out_destroy_wq;
1818
1819 error = xfs_buf_init();
1820 if (error)
1821 goto out_mru_cache_uninit;
1822
1823 error = xfs_init_procfs();
1824 if (error)
1825 goto out_buf_terminate;
1826
1827 error = xfs_sysctl_register();
1828 if (error)
1829 goto out_cleanup_procfs;
1830
1831 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1832 if (!xfs_kset) {
1833 error = -ENOMEM;
1834 goto out_sysctl_unregister;;
1835 }
1836
1837 #ifdef DEBUG
1838 xfs_dbg_kobj.kobject.kset = xfs_kset;
1839 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1840 if (error)
1841 goto out_kset_unregister;
1842 #endif
1843
1844 error = xfs_qm_init();
1845 if (error)
1846 goto out_remove_kobj;
1847
1848 error = register_filesystem(&xfs_fs_type);
1849 if (error)
1850 goto out_qm_exit;
1851 return 0;
1852
1853 out_qm_exit:
1854 xfs_qm_exit();
1855 out_remove_kobj:
1856 #ifdef DEBUG
1857 xfs_sysfs_del(&xfs_dbg_kobj);
1858 out_kset_unregister:
1859 #endif
1860 kset_unregister(xfs_kset);
1861 out_sysctl_unregister:
1862 xfs_sysctl_unregister();
1863 out_cleanup_procfs:
1864 xfs_cleanup_procfs();
1865 out_buf_terminate:
1866 xfs_buf_terminate();
1867 out_mru_cache_uninit:
1868 xfs_mru_cache_uninit();
1869 out_destroy_wq:
1870 xfs_destroy_workqueues();
1871 out_destroy_zones:
1872 xfs_destroy_zones();
1873 out:
1874 return error;
1875 }
1876
1877 STATIC void __exit
exit_xfs_fs(void)1878 exit_xfs_fs(void)
1879 {
1880 xfs_qm_exit();
1881 unregister_filesystem(&xfs_fs_type);
1882 #ifdef DEBUG
1883 xfs_sysfs_del(&xfs_dbg_kobj);
1884 #endif
1885 kset_unregister(xfs_kset);
1886 xfs_sysctl_unregister();
1887 xfs_cleanup_procfs();
1888 xfs_buf_terminate();
1889 xfs_mru_cache_uninit();
1890 xfs_destroy_workqueues();
1891 xfs_destroy_zones();
1892 }
1893
1894 module_init(init_xfs_fs);
1895 module_exit(exit_xfs_fs);
1896
1897 MODULE_AUTHOR("Silicon Graphics, Inc.");
1898 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1899 MODULE_LICENSE("GPL");
1900