xref: /openbmc/linux/fs/xfs/xfs_super.c (revision ee8a99bd)
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_log.h"
21 #include "xfs_inum.h"
22 #include "xfs_trans.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "xfs_dir2.h"
26 #include "xfs_alloc.h"
27 #include "xfs_quota.h"
28 #include "xfs_mount.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_btree.h"
35 #include "xfs_ialloc.h"
36 #include "xfs_bmap.h"
37 #include "xfs_rtalloc.h"
38 #include "xfs_error.h"
39 #include "xfs_itable.h"
40 #include "xfs_fsops.h"
41 #include "xfs_attr.h"
42 #include "xfs_buf_item.h"
43 #include "xfs_utils.h"
44 #include "xfs_vnodeops.h"
45 #include "xfs_log_priv.h"
46 #include "xfs_trans_priv.h"
47 #include "xfs_filestream.h"
48 #include "xfs_da_btree.h"
49 #include "xfs_extfree_item.h"
50 #include "xfs_mru_cache.h"
51 #include "xfs_inode_item.h"
52 #include "xfs_icache.h"
53 #include "xfs_trace.h"
54 #include "xfs_icreate_item.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_32BITINODE   "inode32"	/* inode allocation limited to
93 					 * XFS_MAXINUMBER_32 */
94 #define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */
95 #define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */
96 #define MNTOPT_LARGEIO	   "largeio"	/* report large I/O sizes in stat() */
97 #define MNTOPT_NOLARGEIO   "nolargeio"	/* do not report large I/O sizes
98 					 * in stat(). */
99 #define MNTOPT_ATTR2	"attr2"		/* do use attr2 attribute format */
100 #define MNTOPT_NOATTR2	"noattr2"	/* do not use attr2 attribute format */
101 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
102 #define MNTOPT_QUOTA	"quota"		/* disk quotas (user) */
103 #define MNTOPT_NOQUOTA	"noquota"	/* no quotas */
104 #define MNTOPT_USRQUOTA	"usrquota"	/* user quota enabled */
105 #define MNTOPT_GRPQUOTA	"grpquota"	/* group quota enabled */
106 #define MNTOPT_PRJQUOTA	"prjquota"	/* project quota enabled */
107 #define MNTOPT_UQUOTA	"uquota"	/* user quota (IRIX variant) */
108 #define MNTOPT_GQUOTA	"gquota"	/* group quota (IRIX variant) */
109 #define MNTOPT_PQUOTA	"pquota"	/* project quota (IRIX variant) */
110 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
111 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
112 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
113 #define MNTOPT_QUOTANOENF  "qnoenforce"	/* same as uqnoenforce */
114 #define MNTOPT_DELAYLOG    "delaylog"	/* Delayed logging enabled */
115 #define MNTOPT_NODELAYLOG  "nodelaylog"	/* Delayed logging disabled */
116 #define MNTOPT_DISCARD	   "discard"	/* Discard unused blocks */
117 #define MNTOPT_NODISCARD   "nodiscard"	/* Do not discard unused blocks */
118 
119 /*
120  * Table driven mount option parser.
121  *
122  * Currently only used for remount, but it will be used for mount
123  * in the future, too.
124  */
125 enum {
126 	Opt_barrier,
127 	Opt_nobarrier,
128 	Opt_inode64,
129 	Opt_inode32,
130 	Opt_err
131 };
132 
133 static const match_table_t tokens = {
134 	{Opt_barrier, "barrier"},
135 	{Opt_nobarrier, "nobarrier"},
136 	{Opt_inode64, "inode64"},
137 	{Opt_inode32, "inode32"},
138 	{Opt_err, NULL}
139 };
140 
141 
142 STATIC unsigned long
143 suffix_kstrtoint(char *s, unsigned int base, int *res)
144 {
145 	int	last, shift_left_factor = 0, _res;
146 	char	*value = s;
147 
148 	last = strlen(value) - 1;
149 	if (value[last] == 'K' || value[last] == 'k') {
150 		shift_left_factor = 10;
151 		value[last] = '\0';
152 	}
153 	if (value[last] == 'M' || value[last] == 'm') {
154 		shift_left_factor = 20;
155 		value[last] = '\0';
156 	}
157 	if (value[last] == 'G' || value[last] == 'g') {
158 		shift_left_factor = 30;
159 		value[last] = '\0';
160 	}
161 
162 	if (kstrtoint(s, base, &_res))
163 		return -EINVAL;
164 	*res = _res << shift_left_factor;
165 	return 0;
166 }
167 
168 /*
169  * This function fills in xfs_mount_t fields based on mount args.
170  * Note: the superblock has _not_ yet been read in.
171  *
172  * Note that this function leaks the various device name allocations on
173  * failure.  The caller takes care of them.
174  */
175 STATIC int
176 xfs_parseargs(
177 	struct xfs_mount	*mp,
178 	char			*options)
179 {
180 	struct super_block	*sb = mp->m_super;
181 	char			*this_char, *value;
182 	int			dsunit = 0;
183 	int			dswidth = 0;
184 	int			iosize = 0;
185 	__uint8_t		iosizelog = 0;
186 
187 	/*
188 	 * set up the mount name first so all the errors will refer to the
189 	 * correct device.
190 	 */
191 	mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
192 	if (!mp->m_fsname)
193 		return ENOMEM;
194 	mp->m_fsname_len = strlen(mp->m_fsname) + 1;
195 
196 	/*
197 	 * Copy binary VFS mount flags we are interested in.
198 	 */
199 	if (sb->s_flags & MS_RDONLY)
200 		mp->m_flags |= XFS_MOUNT_RDONLY;
201 	if (sb->s_flags & MS_DIRSYNC)
202 		mp->m_flags |= XFS_MOUNT_DIRSYNC;
203 	if (sb->s_flags & MS_SYNCHRONOUS)
204 		mp->m_flags |= XFS_MOUNT_WSYNC;
205 
206 	/*
207 	 * Set some default flags that could be cleared by the mount option
208 	 * parsing.
209 	 */
210 	mp->m_flags |= XFS_MOUNT_BARRIER;
211 	mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
212 #if !XFS_BIG_INUMS
213 	mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
214 #endif
215 
216 	/*
217 	 * These can be overridden by the mount option parsing.
218 	 */
219 	mp->m_logbufs = -1;
220 	mp->m_logbsize = -1;
221 
222 	if (!options)
223 		goto done;
224 
225 	while ((this_char = strsep(&options, ",")) != NULL) {
226 		if (!*this_char)
227 			continue;
228 		if ((value = strchr(this_char, '=')) != NULL)
229 			*value++ = 0;
230 
231 		if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
232 			if (!value || !*value) {
233 				xfs_warn(mp, "%s option requires an argument",
234 					this_char);
235 				return EINVAL;
236 			}
237 			if (kstrtoint(value, 10, &mp->m_logbufs))
238 				return EINVAL;
239 		} else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
240 			if (!value || !*value) {
241 				xfs_warn(mp, "%s option requires an argument",
242 					this_char);
243 				return EINVAL;
244 			}
245 			if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
246 				return EINVAL;
247 		} else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
248 			if (!value || !*value) {
249 				xfs_warn(mp, "%s option requires an argument",
250 					this_char);
251 				return EINVAL;
252 			}
253 			mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
254 			if (!mp->m_logname)
255 				return ENOMEM;
256 		} else if (!strcmp(this_char, MNTOPT_MTPT)) {
257 			xfs_warn(mp, "%s option not allowed on this system",
258 				this_char);
259 			return EINVAL;
260 		} else if (!strcmp(this_char, MNTOPT_RTDEV)) {
261 			if (!value || !*value) {
262 				xfs_warn(mp, "%s option requires an argument",
263 					this_char);
264 				return EINVAL;
265 			}
266 			mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
267 			if (!mp->m_rtname)
268 				return ENOMEM;
269 		} else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
270 			if (!value || !*value) {
271 				xfs_warn(mp, "%s option requires an argument",
272 					this_char);
273 				return EINVAL;
274 			}
275 			if (kstrtoint(value, 10, &iosize))
276 				return EINVAL;
277 			iosizelog = ffs(iosize) - 1;
278 		} else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
279 			if (!value || !*value) {
280 				xfs_warn(mp, "%s option requires an argument",
281 					this_char);
282 				return EINVAL;
283 			}
284 			if (suffix_kstrtoint(value, 10, &iosize))
285 				return EINVAL;
286 			iosizelog = ffs(iosize) - 1;
287 		} else if (!strcmp(this_char, MNTOPT_GRPID) ||
288 			   !strcmp(this_char, MNTOPT_BSDGROUPS)) {
289 			mp->m_flags |= XFS_MOUNT_GRPID;
290 		} else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
291 			   !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
292 			mp->m_flags &= ~XFS_MOUNT_GRPID;
293 		} else if (!strcmp(this_char, MNTOPT_WSYNC)) {
294 			mp->m_flags |= XFS_MOUNT_WSYNC;
295 		} else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
296 			mp->m_flags |= XFS_MOUNT_NORECOVERY;
297 		} else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
298 			mp->m_flags |= XFS_MOUNT_NOALIGN;
299 		} else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
300 			mp->m_flags |= XFS_MOUNT_SWALLOC;
301 		} else if (!strcmp(this_char, MNTOPT_SUNIT)) {
302 			if (!value || !*value) {
303 				xfs_warn(mp, "%s option requires an argument",
304 					this_char);
305 				return EINVAL;
306 			}
307 			if (kstrtoint(value, 10, &dsunit))
308 				return EINVAL;
309 		} else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
310 			if (!value || !*value) {
311 				xfs_warn(mp, "%s option requires an argument",
312 					this_char);
313 				return EINVAL;
314 			}
315 			if (kstrtoint(value, 10, &dswidth))
316 				return EINVAL;
317 		} else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
318 			mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
319 		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
320 			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
321 #if !XFS_BIG_INUMS
322 			xfs_warn(mp, "%s option not allowed on this system",
323 				this_char);
324 			return EINVAL;
325 #endif
326 		} else if (!strcmp(this_char, MNTOPT_NOUUID)) {
327 			mp->m_flags |= XFS_MOUNT_NOUUID;
328 		} else if (!strcmp(this_char, MNTOPT_BARRIER)) {
329 			mp->m_flags |= XFS_MOUNT_BARRIER;
330 		} else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
331 			mp->m_flags &= ~XFS_MOUNT_BARRIER;
332 		} else if (!strcmp(this_char, MNTOPT_IKEEP)) {
333 			mp->m_flags |= XFS_MOUNT_IKEEP;
334 		} else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
335 			mp->m_flags &= ~XFS_MOUNT_IKEEP;
336 		} else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
337 			mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
338 		} else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
339 			mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
340 		} else if (!strcmp(this_char, MNTOPT_ATTR2)) {
341 			mp->m_flags |= XFS_MOUNT_ATTR2;
342 		} else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
343 			mp->m_flags &= ~XFS_MOUNT_ATTR2;
344 			mp->m_flags |= XFS_MOUNT_NOATTR2;
345 		} else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
346 			mp->m_flags |= XFS_MOUNT_FILESTREAMS;
347 		} else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
348 			mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
349 			mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
350 			mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
351 		} else if (!strcmp(this_char, MNTOPT_QUOTA) ||
352 			   !strcmp(this_char, MNTOPT_UQUOTA) ||
353 			   !strcmp(this_char, MNTOPT_USRQUOTA)) {
354 			mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
355 					 XFS_UQUOTA_ENFD);
356 		} else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
357 			   !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
358 			mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
359 			mp->m_qflags &= ~XFS_UQUOTA_ENFD;
360 		} else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
361 			   !strcmp(this_char, MNTOPT_PRJQUOTA)) {
362 			mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
363 					 XFS_PQUOTA_ENFD);
364 		} else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
365 			mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
366 			mp->m_qflags &= ~XFS_PQUOTA_ENFD;
367 		} else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
368 			   !strcmp(this_char, MNTOPT_GRPQUOTA)) {
369 			mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
370 					 XFS_GQUOTA_ENFD);
371 		} else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
372 			mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
373 			mp->m_qflags &= ~XFS_GQUOTA_ENFD;
374 		} else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
375 			xfs_warn(mp,
376 	"delaylog is the default now, option is deprecated.");
377 		} else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
378 			xfs_warn(mp,
379 	"nodelaylog support has been removed, option is deprecated.");
380 		} else if (!strcmp(this_char, MNTOPT_DISCARD)) {
381 			mp->m_flags |= XFS_MOUNT_DISCARD;
382 		} else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
383 			mp->m_flags &= ~XFS_MOUNT_DISCARD;
384 		} else if (!strcmp(this_char, "ihashsize")) {
385 			xfs_warn(mp,
386 	"ihashsize no longer used, option is deprecated.");
387 		} else if (!strcmp(this_char, "osyncisdsync")) {
388 			xfs_warn(mp,
389 	"osyncisdsync has no effect, option is deprecated.");
390 		} else if (!strcmp(this_char, "osyncisosync")) {
391 			xfs_warn(mp,
392 	"osyncisosync has no effect, option is deprecated.");
393 		} else if (!strcmp(this_char, "irixsgid")) {
394 			xfs_warn(mp,
395 	"irixsgid is now a sysctl(2) variable, option is deprecated.");
396 		} else {
397 			xfs_warn(mp, "unknown mount option [%s].", this_char);
398 			return EINVAL;
399 		}
400 	}
401 
402 	/*
403 	 * no recovery flag requires a read-only mount
404 	 */
405 	if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
406 	    !(mp->m_flags & XFS_MOUNT_RDONLY)) {
407 		xfs_warn(mp, "no-recovery mounts must be read-only.");
408 		return EINVAL;
409 	}
410 
411 	if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
412 		xfs_warn(mp,
413 	"sunit and swidth options incompatible with the noalign option");
414 		return EINVAL;
415 	}
416 
417 #ifndef CONFIG_XFS_QUOTA
418 	if (XFS_IS_QUOTA_RUNNING(mp)) {
419 		xfs_warn(mp, "quota support not available in this kernel.");
420 		return EINVAL;
421 	}
422 #endif
423 
424 	if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
425 	    (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
426 		xfs_warn(mp, "cannot mount with both project and group quota");
427 		return EINVAL;
428 	}
429 
430 	if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
431 		xfs_warn(mp, "sunit and swidth must be specified together");
432 		return EINVAL;
433 	}
434 
435 	if (dsunit && (dswidth % dsunit != 0)) {
436 		xfs_warn(mp,
437 	"stripe width (%d) must be a multiple of the stripe unit (%d)",
438 			dswidth, dsunit);
439 		return EINVAL;
440 	}
441 
442 done:
443 	if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
444 		/*
445 		 * At this point the superblock has not been read
446 		 * in, therefore we do not know the block size.
447 		 * Before the mount call ends we will convert
448 		 * these to FSBs.
449 		 */
450 		mp->m_dalign = dsunit;
451 		mp->m_swidth = dswidth;
452 	}
453 
454 	if (mp->m_logbufs != -1 &&
455 	    mp->m_logbufs != 0 &&
456 	    (mp->m_logbufs < XLOG_MIN_ICLOGS ||
457 	     mp->m_logbufs > XLOG_MAX_ICLOGS)) {
458 		xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
459 			mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
460 		return XFS_ERROR(EINVAL);
461 	}
462 	if (mp->m_logbsize != -1 &&
463 	    mp->m_logbsize !=  0 &&
464 	    (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
465 	     mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
466 	     !is_power_of_2(mp->m_logbsize))) {
467 		xfs_warn(mp,
468 			"invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
469 			mp->m_logbsize);
470 		return XFS_ERROR(EINVAL);
471 	}
472 
473 	if (iosizelog) {
474 		if (iosizelog > XFS_MAX_IO_LOG ||
475 		    iosizelog < XFS_MIN_IO_LOG) {
476 			xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
477 				iosizelog, XFS_MIN_IO_LOG,
478 				XFS_MAX_IO_LOG);
479 			return XFS_ERROR(EINVAL);
480 		}
481 
482 		mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
483 		mp->m_readio_log = iosizelog;
484 		mp->m_writeio_log = iosizelog;
485 	}
486 
487 	return 0;
488 }
489 
490 struct proc_xfs_info {
491 	int	flag;
492 	char	*str;
493 };
494 
495 STATIC int
496 xfs_showargs(
497 	struct xfs_mount	*mp,
498 	struct seq_file		*m)
499 {
500 	static struct proc_xfs_info xfs_info_set[] = {
501 		/* the few simple ones we can get from the mount struct */
502 		{ XFS_MOUNT_IKEEP,		"," MNTOPT_IKEEP },
503 		{ XFS_MOUNT_WSYNC,		"," MNTOPT_WSYNC },
504 		{ XFS_MOUNT_NOALIGN,		"," MNTOPT_NOALIGN },
505 		{ XFS_MOUNT_SWALLOC,		"," MNTOPT_SWALLOC },
506 		{ XFS_MOUNT_NOUUID,		"," MNTOPT_NOUUID },
507 		{ XFS_MOUNT_NORECOVERY,		"," MNTOPT_NORECOVERY },
508 		{ XFS_MOUNT_ATTR2,		"," MNTOPT_ATTR2 },
509 		{ XFS_MOUNT_FILESTREAMS,	"," MNTOPT_FILESTREAM },
510 		{ XFS_MOUNT_GRPID,		"," MNTOPT_GRPID },
511 		{ XFS_MOUNT_DISCARD,		"," MNTOPT_DISCARD },
512 		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_32BITINODE },
513 		{ 0, NULL }
514 	};
515 	static struct proc_xfs_info xfs_info_unset[] = {
516 		/* the few simple ones we can get from the mount struct */
517 		{ XFS_MOUNT_COMPAT_IOSIZE,	"," MNTOPT_LARGEIO },
518 		{ XFS_MOUNT_BARRIER,		"," MNTOPT_NOBARRIER },
519 		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_64BITINODE },
520 		{ 0, NULL }
521 	};
522 	struct proc_xfs_info	*xfs_infop;
523 
524 	for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
525 		if (mp->m_flags & xfs_infop->flag)
526 			seq_puts(m, xfs_infop->str);
527 	}
528 	for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
529 		if (!(mp->m_flags & xfs_infop->flag))
530 			seq_puts(m, xfs_infop->str);
531 	}
532 
533 	if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
534 		seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
535 				(int)(1 << mp->m_writeio_log) >> 10);
536 
537 	if (mp->m_logbufs > 0)
538 		seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
539 	if (mp->m_logbsize > 0)
540 		seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
541 
542 	if (mp->m_logname)
543 		seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
544 	if (mp->m_rtname)
545 		seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
546 
547 	if (mp->m_dalign > 0)
548 		seq_printf(m, "," MNTOPT_SUNIT "=%d",
549 				(int)XFS_FSB_TO_BB(mp, mp->m_dalign));
550 	if (mp->m_swidth > 0)
551 		seq_printf(m, "," MNTOPT_SWIDTH "=%d",
552 				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));
553 
554 	if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
555 		seq_puts(m, "," MNTOPT_USRQUOTA);
556 	else if (mp->m_qflags & XFS_UQUOTA_ACCT)
557 		seq_puts(m, "," MNTOPT_UQUOTANOENF);
558 
559 	/* Either project or group quotas can be active, not both */
560 
561 	if (mp->m_qflags & XFS_PQUOTA_ACCT) {
562 		if (mp->m_qflags & XFS_PQUOTA_ENFD)
563 			seq_puts(m, "," MNTOPT_PRJQUOTA);
564 		else
565 			seq_puts(m, "," MNTOPT_PQUOTANOENF);
566 	} else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
567 		if (mp->m_qflags & XFS_GQUOTA_ENFD)
568 			seq_puts(m, "," MNTOPT_GRPQUOTA);
569 		else
570 			seq_puts(m, "," MNTOPT_GQUOTANOENF);
571 	}
572 
573 	if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
574 		seq_puts(m, "," MNTOPT_NOQUOTA);
575 
576 	return 0;
577 }
578 __uint64_t
579 xfs_max_file_offset(
580 	unsigned int		blockshift)
581 {
582 	unsigned int		pagefactor = 1;
583 	unsigned int		bitshift = BITS_PER_LONG - 1;
584 
585 	/* Figure out maximum filesize, on Linux this can depend on
586 	 * the filesystem blocksize (on 32 bit platforms).
587 	 * __block_write_begin does this in an [unsigned] long...
588 	 *      page->index << (PAGE_CACHE_SHIFT - bbits)
589 	 * So, for page sized blocks (4K on 32 bit platforms),
590 	 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
591 	 *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
592 	 * but for smaller blocksizes it is less (bbits = log2 bsize).
593 	 * Note1: get_block_t takes a long (implicit cast from above)
594 	 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
595 	 * can optionally convert the [unsigned] long from above into
596 	 * an [unsigned] long long.
597 	 */
598 
599 #if BITS_PER_LONG == 32
600 # if defined(CONFIG_LBDAF)
601 	ASSERT(sizeof(sector_t) == 8);
602 	pagefactor = PAGE_CACHE_SIZE;
603 	bitshift = BITS_PER_LONG;
604 # else
605 	pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
606 # endif
607 #endif
608 
609 	return (((__uint64_t)pagefactor) << bitshift) - 1;
610 }
611 
612 xfs_agnumber_t
613 xfs_set_inode32(struct xfs_mount *mp)
614 {
615 	xfs_agnumber_t	index = 0;
616 	xfs_agnumber_t	maxagi = 0;
617 	xfs_sb_t	*sbp = &mp->m_sb;
618 	xfs_agnumber_t	max_metadata;
619 	xfs_agino_t	agino =	XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0);
620 	xfs_ino_t	ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino);
621 	xfs_perag_t	*pag;
622 
623 	/* Calculate how much should be reserved for inodes to meet
624 	 * the max inode percentage.
625 	 */
626 	if (mp->m_maxicount) {
627 		__uint64_t	icount;
628 
629 		icount = sbp->sb_dblocks * sbp->sb_imax_pct;
630 		do_div(icount, 100);
631 		icount += sbp->sb_agblocks - 1;
632 		do_div(icount, sbp->sb_agblocks);
633 		max_metadata = icount;
634 	} else {
635 		max_metadata = sbp->sb_agcount;
636 	}
637 
638 	for (index = 0; index < sbp->sb_agcount; index++) {
639 		ino = XFS_AGINO_TO_INO(mp, index, agino);
640 
641 		if (ino > XFS_MAXINUMBER_32) {
642 			pag = xfs_perag_get(mp, index);
643 			pag->pagi_inodeok = 0;
644 			pag->pagf_metadata = 0;
645 			xfs_perag_put(pag);
646 			continue;
647 		}
648 
649 		pag = xfs_perag_get(mp, index);
650 		pag->pagi_inodeok = 1;
651 		maxagi++;
652 		if (index < max_metadata)
653 			pag->pagf_metadata = 1;
654 		xfs_perag_put(pag);
655 	}
656 	mp->m_flags |= (XFS_MOUNT_32BITINODES |
657 			XFS_MOUNT_SMALL_INUMS);
658 
659 	return maxagi;
660 }
661 
662 xfs_agnumber_t
663 xfs_set_inode64(struct xfs_mount *mp)
664 {
665 	xfs_agnumber_t index = 0;
666 
667 	for (index = 0; index < mp->m_sb.sb_agcount; index++) {
668 		struct xfs_perag	*pag;
669 
670 		pag = xfs_perag_get(mp, index);
671 		pag->pagi_inodeok = 1;
672 		pag->pagf_metadata = 0;
673 		xfs_perag_put(pag);
674 	}
675 
676 	/* There is no need for lock protection on m_flags,
677 	 * the rw_semaphore of the VFS superblock is locked
678 	 * during mount/umount/remount operations, so this is
679 	 * enough to avoid concurency on the m_flags field
680 	 */
681 	mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
682 			 XFS_MOUNT_SMALL_INUMS);
683 	return index;
684 }
685 
686 STATIC int
687 xfs_blkdev_get(
688 	xfs_mount_t		*mp,
689 	const char		*name,
690 	struct block_device	**bdevp)
691 {
692 	int			error = 0;
693 
694 	*bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
695 				    mp);
696 	if (IS_ERR(*bdevp)) {
697 		error = PTR_ERR(*bdevp);
698 		xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
699 	}
700 
701 	return -error;
702 }
703 
704 STATIC void
705 xfs_blkdev_put(
706 	struct block_device	*bdev)
707 {
708 	if (bdev)
709 		blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
710 }
711 
712 void
713 xfs_blkdev_issue_flush(
714 	xfs_buftarg_t		*buftarg)
715 {
716 	blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
717 }
718 
719 STATIC void
720 xfs_close_devices(
721 	struct xfs_mount	*mp)
722 {
723 	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
724 		struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
725 		xfs_free_buftarg(mp, mp->m_logdev_targp);
726 		xfs_blkdev_put(logdev);
727 	}
728 	if (mp->m_rtdev_targp) {
729 		struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
730 		xfs_free_buftarg(mp, mp->m_rtdev_targp);
731 		xfs_blkdev_put(rtdev);
732 	}
733 	xfs_free_buftarg(mp, mp->m_ddev_targp);
734 }
735 
736 /*
737  * The file system configurations are:
738  *	(1) device (partition) with data and internal log
739  *	(2) logical volume with data and log subvolumes.
740  *	(3) logical volume with data, log, and realtime subvolumes.
741  *
742  * We only have to handle opening the log and realtime volumes here if
743  * they are present.  The data subvolume has already been opened by
744  * get_sb_bdev() and is stored in sb->s_bdev.
745  */
746 STATIC int
747 xfs_open_devices(
748 	struct xfs_mount	*mp)
749 {
750 	struct block_device	*ddev = mp->m_super->s_bdev;
751 	struct block_device	*logdev = NULL, *rtdev = NULL;
752 	int			error;
753 
754 	/*
755 	 * Open real time and log devices - order is important.
756 	 */
757 	if (mp->m_logname) {
758 		error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
759 		if (error)
760 			goto out;
761 	}
762 
763 	if (mp->m_rtname) {
764 		error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
765 		if (error)
766 			goto out_close_logdev;
767 
768 		if (rtdev == ddev || rtdev == logdev) {
769 			xfs_warn(mp,
770 	"Cannot mount filesystem with identical rtdev and ddev/logdev.");
771 			error = EINVAL;
772 			goto out_close_rtdev;
773 		}
774 	}
775 
776 	/*
777 	 * Setup xfs_mount buffer target pointers
778 	 */
779 	error = ENOMEM;
780 	mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
781 	if (!mp->m_ddev_targp)
782 		goto out_close_rtdev;
783 
784 	if (rtdev) {
785 		mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
786 							mp->m_fsname);
787 		if (!mp->m_rtdev_targp)
788 			goto out_free_ddev_targ;
789 	}
790 
791 	if (logdev && logdev != ddev) {
792 		mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
793 							mp->m_fsname);
794 		if (!mp->m_logdev_targp)
795 			goto out_free_rtdev_targ;
796 	} else {
797 		mp->m_logdev_targp = mp->m_ddev_targp;
798 	}
799 
800 	return 0;
801 
802  out_free_rtdev_targ:
803 	if (mp->m_rtdev_targp)
804 		xfs_free_buftarg(mp, mp->m_rtdev_targp);
805  out_free_ddev_targ:
806 	xfs_free_buftarg(mp, mp->m_ddev_targp);
807  out_close_rtdev:
808 	if (rtdev)
809 		xfs_blkdev_put(rtdev);
810  out_close_logdev:
811 	if (logdev && logdev != ddev)
812 		xfs_blkdev_put(logdev);
813  out:
814 	return error;
815 }
816 
817 /*
818  * Setup xfs_mount buffer target pointers based on superblock
819  */
820 STATIC int
821 xfs_setup_devices(
822 	struct xfs_mount	*mp)
823 {
824 	int			error;
825 
826 	error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
827 				    mp->m_sb.sb_sectsize);
828 	if (error)
829 		return error;
830 
831 	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
832 		unsigned int	log_sector_size = BBSIZE;
833 
834 		if (xfs_sb_version_hassector(&mp->m_sb))
835 			log_sector_size = mp->m_sb.sb_logsectsize;
836 		error = xfs_setsize_buftarg(mp->m_logdev_targp,
837 					    mp->m_sb.sb_blocksize,
838 					    log_sector_size);
839 		if (error)
840 			return error;
841 	}
842 	if (mp->m_rtdev_targp) {
843 		error = xfs_setsize_buftarg(mp->m_rtdev_targp,
844 					    mp->m_sb.sb_blocksize,
845 					    mp->m_sb.sb_sectsize);
846 		if (error)
847 			return error;
848 	}
849 
850 	return 0;
851 }
852 
853 STATIC int
854 xfs_init_mount_workqueues(
855 	struct xfs_mount	*mp)
856 {
857 	mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
858 			WQ_MEM_RECLAIM, 0, mp->m_fsname);
859 	if (!mp->m_data_workqueue)
860 		goto out;
861 
862 	mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
863 			WQ_MEM_RECLAIM, 0, mp->m_fsname);
864 	if (!mp->m_unwritten_workqueue)
865 		goto out_destroy_data_iodone_queue;
866 
867 	mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
868 			WQ_MEM_RECLAIM, 0, mp->m_fsname);
869 	if (!mp->m_cil_workqueue)
870 		goto out_destroy_unwritten;
871 
872 	mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
873 			WQ_NON_REENTRANT, 0, mp->m_fsname);
874 	if (!mp->m_reclaim_workqueue)
875 		goto out_destroy_cil;
876 
877 	mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
878 			WQ_NON_REENTRANT, 0, mp->m_fsname);
879 	if (!mp->m_log_workqueue)
880 		goto out_destroy_reclaim;
881 
882 	mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
883 			WQ_NON_REENTRANT, 0, mp->m_fsname);
884 	if (!mp->m_eofblocks_workqueue)
885 		goto out_destroy_log;
886 
887 	return 0;
888 
889 out_destroy_log:
890 	destroy_workqueue(mp->m_log_workqueue);
891 out_destroy_reclaim:
892 	destroy_workqueue(mp->m_reclaim_workqueue);
893 out_destroy_cil:
894 	destroy_workqueue(mp->m_cil_workqueue);
895 out_destroy_unwritten:
896 	destroy_workqueue(mp->m_unwritten_workqueue);
897 out_destroy_data_iodone_queue:
898 	destroy_workqueue(mp->m_data_workqueue);
899 out:
900 	return -ENOMEM;
901 }
902 
903 STATIC void
904 xfs_destroy_mount_workqueues(
905 	struct xfs_mount	*mp)
906 {
907 	destroy_workqueue(mp->m_eofblocks_workqueue);
908 	destroy_workqueue(mp->m_log_workqueue);
909 	destroy_workqueue(mp->m_reclaim_workqueue);
910 	destroy_workqueue(mp->m_cil_workqueue);
911 	destroy_workqueue(mp->m_data_workqueue);
912 	destroy_workqueue(mp->m_unwritten_workqueue);
913 }
914 
915 /*
916  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
917  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
918  * for IO to complete so that we effectively throttle multiple callers to the
919  * rate at which IO is completing.
920  */
921 void
922 xfs_flush_inodes(
923 	struct xfs_mount	*mp)
924 {
925 	struct super_block	*sb = mp->m_super;
926 
927 	if (down_read_trylock(&sb->s_umount)) {
928 		sync_inodes_sb(sb);
929 		up_read(&sb->s_umount);
930 	}
931 }
932 
933 /* Catch misguided souls that try to use this interface on XFS */
934 STATIC struct inode *
935 xfs_fs_alloc_inode(
936 	struct super_block	*sb)
937 {
938 	BUG();
939 	return NULL;
940 }
941 
942 /*
943  * Now that the generic code is guaranteed not to be accessing
944  * the linux inode, we can reclaim the inode.
945  */
946 STATIC void
947 xfs_fs_destroy_inode(
948 	struct inode		*inode)
949 {
950 	struct xfs_inode	*ip = XFS_I(inode);
951 
952 	trace_xfs_destroy_inode(ip);
953 
954 	XFS_STATS_INC(vn_reclaim);
955 
956 	/* bad inode, get out here ASAP */
957 	if (is_bad_inode(inode))
958 		goto out_reclaim;
959 
960 	ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
961 
962 	/*
963 	 * We should never get here with one of the reclaim flags already set.
964 	 */
965 	ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
966 	ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
967 
968 	/*
969 	 * We always use background reclaim here because even if the
970 	 * inode is clean, it still may be under IO and hence we have
971 	 * to take the flush lock. The background reclaim path handles
972 	 * this more efficiently than we can here, so simply let background
973 	 * reclaim tear down all inodes.
974 	 */
975 out_reclaim:
976 	xfs_inode_set_reclaim_tag(ip);
977 }
978 
979 /*
980  * Slab object creation initialisation for the XFS inode.
981  * This covers only the idempotent fields in the XFS inode;
982  * all other fields need to be initialised on allocation
983  * from the slab. This avoids the need to repeatedly initialise
984  * fields in the xfs inode that left in the initialise state
985  * when freeing the inode.
986  */
987 STATIC void
988 xfs_fs_inode_init_once(
989 	void			*inode)
990 {
991 	struct xfs_inode	*ip = inode;
992 
993 	memset(ip, 0, sizeof(struct xfs_inode));
994 
995 	/* vfs inode */
996 	inode_init_once(VFS_I(ip));
997 
998 	/* xfs inode */
999 	atomic_set(&ip->i_pincount, 0);
1000 	spin_lock_init(&ip->i_flags_lock);
1001 
1002 	mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1003 		     "xfsino", ip->i_ino);
1004 }
1005 
1006 STATIC void
1007 xfs_fs_evict_inode(
1008 	struct inode		*inode)
1009 {
1010 	xfs_inode_t		*ip = XFS_I(inode);
1011 
1012 	ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
1013 
1014 	trace_xfs_evict_inode(ip);
1015 
1016 	truncate_inode_pages(&inode->i_data, 0);
1017 	clear_inode(inode);
1018 	XFS_STATS_INC(vn_rele);
1019 	XFS_STATS_INC(vn_remove);
1020 	XFS_STATS_DEC(vn_active);
1021 
1022 	xfs_inactive(ip);
1023 }
1024 
1025 /*
1026  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1027  * serialised against cache hits here via the inode->i_lock and igrab() in
1028  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1029  * racing with us, and it avoids needing to grab a spinlock here for every inode
1030  * we drop the final reference on.
1031  */
1032 STATIC int
1033 xfs_fs_drop_inode(
1034 	struct inode		*inode)
1035 {
1036 	struct xfs_inode	*ip = XFS_I(inode);
1037 
1038 	return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1039 }
1040 
1041 STATIC void
1042 xfs_free_fsname(
1043 	struct xfs_mount	*mp)
1044 {
1045 	kfree(mp->m_fsname);
1046 	kfree(mp->m_rtname);
1047 	kfree(mp->m_logname);
1048 }
1049 
1050 STATIC void
1051 xfs_fs_put_super(
1052 	struct super_block	*sb)
1053 {
1054 	struct xfs_mount	*mp = XFS_M(sb);
1055 
1056 	xfs_filestream_unmount(mp);
1057 	xfs_unmountfs(mp);
1058 
1059 	xfs_freesb(mp);
1060 	xfs_icsb_destroy_counters(mp);
1061 	xfs_destroy_mount_workqueues(mp);
1062 	xfs_close_devices(mp);
1063 	xfs_free_fsname(mp);
1064 	kfree(mp);
1065 }
1066 
1067 STATIC int
1068 xfs_fs_sync_fs(
1069 	struct super_block	*sb,
1070 	int			wait)
1071 {
1072 	struct xfs_mount	*mp = XFS_M(sb);
1073 
1074 	/*
1075 	 * Doing anything during the async pass would be counterproductive.
1076 	 */
1077 	if (!wait)
1078 		return 0;
1079 
1080 	xfs_log_force(mp, XFS_LOG_SYNC);
1081 	if (laptop_mode) {
1082 		/*
1083 		 * The disk must be active because we're syncing.
1084 		 * We schedule log work now (now that the disk is
1085 		 * active) instead of later (when it might not be).
1086 		 */
1087 		flush_delayed_work(&mp->m_log->l_work);
1088 	}
1089 
1090 	return 0;
1091 }
1092 
1093 STATIC int
1094 xfs_fs_statfs(
1095 	struct dentry		*dentry,
1096 	struct kstatfs		*statp)
1097 {
1098 	struct xfs_mount	*mp = XFS_M(dentry->d_sb);
1099 	xfs_sb_t		*sbp = &mp->m_sb;
1100 	struct xfs_inode	*ip = XFS_I(dentry->d_inode);
1101 	__uint64_t		fakeinos, id;
1102 	xfs_extlen_t		lsize;
1103 	__int64_t		ffree;
1104 
1105 	statp->f_type = XFS_SB_MAGIC;
1106 	statp->f_namelen = MAXNAMELEN - 1;
1107 
1108 	id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1109 	statp->f_fsid.val[0] = (u32)id;
1110 	statp->f_fsid.val[1] = (u32)(id >> 32);
1111 
1112 	xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1113 
1114 	spin_lock(&mp->m_sb_lock);
1115 	statp->f_bsize = sbp->sb_blocksize;
1116 	lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1117 	statp->f_blocks = sbp->sb_dblocks - lsize;
1118 	statp->f_bfree = statp->f_bavail =
1119 				sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1120 	fakeinos = statp->f_bfree << sbp->sb_inopblog;
1121 	statp->f_files =
1122 	    MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1123 	if (mp->m_maxicount)
1124 		statp->f_files = min_t(typeof(statp->f_files),
1125 					statp->f_files,
1126 					mp->m_maxicount);
1127 
1128 	/* make sure statp->f_ffree does not underflow */
1129 	ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1130 	statp->f_ffree = max_t(__int64_t, ffree, 0);
1131 
1132 	spin_unlock(&mp->m_sb_lock);
1133 
1134 	if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1135 	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1136 			      (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1137 		xfs_qm_statvfs(ip, statp);
1138 	return 0;
1139 }
1140 
1141 STATIC void
1142 xfs_save_resvblks(struct xfs_mount *mp)
1143 {
1144 	__uint64_t resblks = 0;
1145 
1146 	mp->m_resblks_save = mp->m_resblks;
1147 	xfs_reserve_blocks(mp, &resblks, NULL);
1148 }
1149 
1150 STATIC void
1151 xfs_restore_resvblks(struct xfs_mount *mp)
1152 {
1153 	__uint64_t resblks;
1154 
1155 	if (mp->m_resblks_save) {
1156 		resblks = mp->m_resblks_save;
1157 		mp->m_resblks_save = 0;
1158 	} else
1159 		resblks = xfs_default_resblks(mp);
1160 
1161 	xfs_reserve_blocks(mp, &resblks, NULL);
1162 }
1163 
1164 /*
1165  * Trigger writeback of all the dirty metadata in the file system.
1166  *
1167  * This ensures that the metadata is written to their location on disk rather
1168  * than just existing in transactions in the log. This means after a quiesce
1169  * there is no log replay required to write the inodes to disk - this is the
1170  * primary difference between a sync and a quiesce.
1171  *
1172  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1173  * it is started again when appropriate.
1174  */
1175 void
1176 xfs_quiesce_attr(
1177 	struct xfs_mount	*mp)
1178 {
1179 	int	error = 0;
1180 
1181 	/* wait for all modifications to complete */
1182 	while (atomic_read(&mp->m_active_trans) > 0)
1183 		delay(100);
1184 
1185 	/* force the log to unpin objects from the now complete transactions */
1186 	xfs_log_force(mp, XFS_LOG_SYNC);
1187 
1188 	/* reclaim inodes to do any IO before the freeze completes */
1189 	xfs_reclaim_inodes(mp, 0);
1190 	xfs_reclaim_inodes(mp, SYNC_WAIT);
1191 
1192 	/* Push the superblock and write an unmount record */
1193 	error = xfs_log_sbcount(mp);
1194 	if (error)
1195 		xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1196 				"Frozen image may not be consistent.");
1197 	/*
1198 	 * Just warn here till VFS can correctly support
1199 	 * read-only remount without racing.
1200 	 */
1201 	WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1202 
1203 	xfs_log_quiesce(mp);
1204 }
1205 
1206 STATIC int
1207 xfs_fs_remount(
1208 	struct super_block	*sb,
1209 	int			*flags,
1210 	char			*options)
1211 {
1212 	struct xfs_mount	*mp = XFS_M(sb);
1213 	substring_t		args[MAX_OPT_ARGS];
1214 	char			*p;
1215 	int			error;
1216 
1217 	while ((p = strsep(&options, ",")) != NULL) {
1218 		int token;
1219 
1220 		if (!*p)
1221 			continue;
1222 
1223 		token = match_token(p, tokens, args);
1224 		switch (token) {
1225 		case Opt_barrier:
1226 			mp->m_flags |= XFS_MOUNT_BARRIER;
1227 			break;
1228 		case Opt_nobarrier:
1229 			mp->m_flags &= ~XFS_MOUNT_BARRIER;
1230 			break;
1231 		case Opt_inode64:
1232 			mp->m_maxagi = xfs_set_inode64(mp);
1233 			break;
1234 		case Opt_inode32:
1235 			mp->m_maxagi = xfs_set_inode32(mp);
1236 			break;
1237 		default:
1238 			/*
1239 			 * Logically we would return an error here to prevent
1240 			 * users from believing they might have changed
1241 			 * mount options using remount which can't be changed.
1242 			 *
1243 			 * But unfortunately mount(8) adds all options from
1244 			 * mtab and fstab to the mount arguments in some cases
1245 			 * so we can't blindly reject options, but have to
1246 			 * check for each specified option if it actually
1247 			 * differs from the currently set option and only
1248 			 * reject it if that's the case.
1249 			 *
1250 			 * Until that is implemented we return success for
1251 			 * every remount request, and silently ignore all
1252 			 * options that we can't actually change.
1253 			 */
1254 #if 0
1255 			xfs_info(mp,
1256 		"mount option \"%s\" not supported for remount\n", p);
1257 			return -EINVAL;
1258 #else
1259 			break;
1260 #endif
1261 		}
1262 	}
1263 
1264 	/* ro -> rw */
1265 	if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1266 		mp->m_flags &= ~XFS_MOUNT_RDONLY;
1267 
1268 		/*
1269 		 * If this is the first remount to writeable state we
1270 		 * might have some superblock changes to update.
1271 		 */
1272 		if (mp->m_update_flags) {
1273 			error = xfs_mount_log_sb(mp, mp->m_update_flags);
1274 			if (error) {
1275 				xfs_warn(mp, "failed to write sb changes");
1276 				return error;
1277 			}
1278 			mp->m_update_flags = 0;
1279 		}
1280 
1281 		/*
1282 		 * Fill out the reserve pool if it is empty. Use the stashed
1283 		 * value if it is non-zero, otherwise go with the default.
1284 		 */
1285 		xfs_restore_resvblks(mp);
1286 		xfs_log_work_queue(mp);
1287 	}
1288 
1289 	/* rw -> ro */
1290 	if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1291 		/*
1292 		 * Before we sync the metadata, we need to free up the reserve
1293 		 * block pool so that the used block count in the superblock on
1294 		 * disk is correct at the end of the remount. Stash the current
1295 		 * reserve pool size so that if we get remounted rw, we can
1296 		 * return it to the same size.
1297 		 */
1298 		xfs_save_resvblks(mp);
1299 		xfs_quiesce_attr(mp);
1300 		mp->m_flags |= XFS_MOUNT_RDONLY;
1301 	}
1302 
1303 	return 0;
1304 }
1305 
1306 /*
1307  * Second stage of a freeze. The data is already frozen so we only
1308  * need to take care of the metadata. Once that's done write a dummy
1309  * record to dirty the log in case of a crash while frozen.
1310  */
1311 STATIC int
1312 xfs_fs_freeze(
1313 	struct super_block	*sb)
1314 {
1315 	struct xfs_mount	*mp = XFS_M(sb);
1316 
1317 	xfs_save_resvblks(mp);
1318 	xfs_quiesce_attr(mp);
1319 	return -xfs_fs_log_dummy(mp);
1320 }
1321 
1322 STATIC int
1323 xfs_fs_unfreeze(
1324 	struct super_block	*sb)
1325 {
1326 	struct xfs_mount	*mp = XFS_M(sb);
1327 
1328 	xfs_restore_resvblks(mp);
1329 	xfs_log_work_queue(mp);
1330 	return 0;
1331 }
1332 
1333 STATIC int
1334 xfs_fs_show_options(
1335 	struct seq_file		*m,
1336 	struct dentry		*root)
1337 {
1338 	return -xfs_showargs(XFS_M(root->d_sb), m);
1339 }
1340 
1341 /*
1342  * This function fills in xfs_mount_t fields based on mount args.
1343  * Note: the superblock _has_ now been read in.
1344  */
1345 STATIC int
1346 xfs_finish_flags(
1347 	struct xfs_mount	*mp)
1348 {
1349 	int			ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1350 
1351 	/* Fail a mount where the logbuf is smaller than the log stripe */
1352 	if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1353 		if (mp->m_logbsize <= 0 &&
1354 		    mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1355 			mp->m_logbsize = mp->m_sb.sb_logsunit;
1356 		} else if (mp->m_logbsize > 0 &&
1357 			   mp->m_logbsize < mp->m_sb.sb_logsunit) {
1358 			xfs_warn(mp,
1359 		"logbuf size must be greater than or equal to log stripe size");
1360 			return XFS_ERROR(EINVAL);
1361 		}
1362 	} else {
1363 		/* Fail a mount if the logbuf is larger than 32K */
1364 		if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1365 			xfs_warn(mp,
1366 		"logbuf size for version 1 logs must be 16K or 32K");
1367 			return XFS_ERROR(EINVAL);
1368 		}
1369 	}
1370 
1371 	/*
1372 	 * V5 filesystems always use attr2 format for attributes.
1373 	 */
1374 	if (xfs_sb_version_hascrc(&mp->m_sb) &&
1375 	    (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1376 		xfs_warn(mp,
1377 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
1378 			MNTOPT_NOATTR2, MNTOPT_ATTR2);
1379 		return XFS_ERROR(EINVAL);
1380 	}
1381 
1382 	/*
1383 	 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1384 	 * told by noattr2 to turn it off
1385 	 */
1386 	if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1387 	    !(mp->m_flags & XFS_MOUNT_NOATTR2))
1388 		mp->m_flags |= XFS_MOUNT_ATTR2;
1389 
1390 	/*
1391 	 * prohibit r/w mounts of read-only filesystems
1392 	 */
1393 	if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1394 		xfs_warn(mp,
1395 			"cannot mount a read-only filesystem as read-write");
1396 		return XFS_ERROR(EROFS);
1397 	}
1398 
1399 	return 0;
1400 }
1401 
1402 STATIC int
1403 xfs_fs_fill_super(
1404 	struct super_block	*sb,
1405 	void			*data,
1406 	int			silent)
1407 {
1408 	struct inode		*root;
1409 	struct xfs_mount	*mp = NULL;
1410 	int			flags = 0, error = ENOMEM;
1411 
1412 	mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1413 	if (!mp)
1414 		goto out;
1415 
1416 	spin_lock_init(&mp->m_sb_lock);
1417 	mutex_init(&mp->m_growlock);
1418 	atomic_set(&mp->m_active_trans, 0);
1419 	INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1420 	INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1421 
1422 	mp->m_super = sb;
1423 	sb->s_fs_info = mp;
1424 
1425 	error = xfs_parseargs(mp, (char *)data);
1426 	if (error)
1427 		goto out_free_fsname;
1428 
1429 	sb_min_blocksize(sb, BBSIZE);
1430 	sb->s_xattr = xfs_xattr_handlers;
1431 	sb->s_export_op = &xfs_export_operations;
1432 #ifdef CONFIG_XFS_QUOTA
1433 	sb->s_qcop = &xfs_quotactl_operations;
1434 #endif
1435 	sb->s_op = &xfs_super_operations;
1436 
1437 	if (silent)
1438 		flags |= XFS_MFSI_QUIET;
1439 
1440 	error = xfs_open_devices(mp);
1441 	if (error)
1442 		goto out_free_fsname;
1443 
1444 	error = xfs_init_mount_workqueues(mp);
1445 	if (error)
1446 		goto out_close_devices;
1447 
1448 	error = xfs_icsb_init_counters(mp);
1449 	if (error)
1450 		goto out_destroy_workqueues;
1451 
1452 	error = xfs_readsb(mp, flags);
1453 	if (error)
1454 		goto out_destroy_counters;
1455 
1456 	error = xfs_finish_flags(mp);
1457 	if (error)
1458 		goto out_free_sb;
1459 
1460 	error = xfs_setup_devices(mp);
1461 	if (error)
1462 		goto out_free_sb;
1463 
1464 	error = xfs_filestream_mount(mp);
1465 	if (error)
1466 		goto out_free_sb;
1467 
1468 	/*
1469 	 * we must configure the block size in the superblock before we run the
1470 	 * full mount process as the mount process can lookup and cache inodes.
1471 	 */
1472 	sb->s_magic = XFS_SB_MAGIC;
1473 	sb->s_blocksize = mp->m_sb.sb_blocksize;
1474 	sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1475 	sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1476 	sb->s_max_links = XFS_MAXLINK;
1477 	sb->s_time_gran = 1;
1478 	set_posix_acl_flag(sb);
1479 
1480 	/* version 5 superblocks support inode version counters. */
1481 	if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1482 		sb->s_flags |= MS_I_VERSION;
1483 
1484 	error = xfs_mountfs(mp);
1485 	if (error)
1486 		goto out_filestream_unmount;
1487 
1488 	root = igrab(VFS_I(mp->m_rootip));
1489 	if (!root) {
1490 		error = ENOENT;
1491 		goto out_unmount;
1492 	}
1493 	if (is_bad_inode(root)) {
1494 		error = EINVAL;
1495 		goto out_unmount;
1496 	}
1497 	sb->s_root = d_make_root(root);
1498 	if (!sb->s_root) {
1499 		error = ENOMEM;
1500 		goto out_unmount;
1501 	}
1502 
1503 	return 0;
1504 
1505  out_filestream_unmount:
1506 	xfs_filestream_unmount(mp);
1507  out_free_sb:
1508 	xfs_freesb(mp);
1509  out_destroy_counters:
1510 	xfs_icsb_destroy_counters(mp);
1511 out_destroy_workqueues:
1512 	xfs_destroy_mount_workqueues(mp);
1513  out_close_devices:
1514 	xfs_close_devices(mp);
1515  out_free_fsname:
1516 	xfs_free_fsname(mp);
1517 	kfree(mp);
1518  out:
1519 	return -error;
1520 
1521  out_unmount:
1522 	xfs_filestream_unmount(mp);
1523 	xfs_unmountfs(mp);
1524 	goto out_free_sb;
1525 }
1526 
1527 STATIC struct dentry *
1528 xfs_fs_mount(
1529 	struct file_system_type	*fs_type,
1530 	int			flags,
1531 	const char		*dev_name,
1532 	void			*data)
1533 {
1534 	return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1535 }
1536 
1537 static int
1538 xfs_fs_nr_cached_objects(
1539 	struct super_block	*sb)
1540 {
1541 	return xfs_reclaim_inodes_count(XFS_M(sb));
1542 }
1543 
1544 static void
1545 xfs_fs_free_cached_objects(
1546 	struct super_block	*sb,
1547 	int			nr_to_scan)
1548 {
1549 	xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1550 }
1551 
1552 static const struct super_operations xfs_super_operations = {
1553 	.alloc_inode		= xfs_fs_alloc_inode,
1554 	.destroy_inode		= xfs_fs_destroy_inode,
1555 	.evict_inode		= xfs_fs_evict_inode,
1556 	.drop_inode		= xfs_fs_drop_inode,
1557 	.put_super		= xfs_fs_put_super,
1558 	.sync_fs		= xfs_fs_sync_fs,
1559 	.freeze_fs		= xfs_fs_freeze,
1560 	.unfreeze_fs		= xfs_fs_unfreeze,
1561 	.statfs			= xfs_fs_statfs,
1562 	.remount_fs		= xfs_fs_remount,
1563 	.show_options		= xfs_fs_show_options,
1564 	.nr_cached_objects	= xfs_fs_nr_cached_objects,
1565 	.free_cached_objects	= xfs_fs_free_cached_objects,
1566 };
1567 
1568 static struct file_system_type xfs_fs_type = {
1569 	.owner			= THIS_MODULE,
1570 	.name			= "xfs",
1571 	.mount			= xfs_fs_mount,
1572 	.kill_sb		= kill_block_super,
1573 	.fs_flags		= FS_REQUIRES_DEV,
1574 };
1575 MODULE_ALIAS_FS("xfs");
1576 
1577 STATIC int __init
1578 xfs_init_zones(void)
1579 {
1580 
1581 	xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1582 	if (!xfs_ioend_zone)
1583 		goto out;
1584 
1585 	xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1586 						  xfs_ioend_zone);
1587 	if (!xfs_ioend_pool)
1588 		goto out_destroy_ioend_zone;
1589 
1590 	xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1591 						"xfs_log_ticket");
1592 	if (!xfs_log_ticket_zone)
1593 		goto out_destroy_ioend_pool;
1594 
1595 	xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1596 						"xfs_bmap_free_item");
1597 	if (!xfs_bmap_free_item_zone)
1598 		goto out_destroy_log_ticket_zone;
1599 
1600 	xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1601 						"xfs_btree_cur");
1602 	if (!xfs_btree_cur_zone)
1603 		goto out_destroy_bmap_free_item_zone;
1604 
1605 	xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1606 						"xfs_da_state");
1607 	if (!xfs_da_state_zone)
1608 		goto out_destroy_btree_cur_zone;
1609 
1610 	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1611 	if (!xfs_ifork_zone)
1612 		goto out_destroy_da_state_zone;
1613 
1614 	xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1615 	if (!xfs_trans_zone)
1616 		goto out_destroy_ifork_zone;
1617 
1618 	xfs_log_item_desc_zone =
1619 		kmem_zone_init(sizeof(struct xfs_log_item_desc),
1620 			       "xfs_log_item_desc");
1621 	if (!xfs_log_item_desc_zone)
1622 		goto out_destroy_trans_zone;
1623 
1624 	/*
1625 	 * The size of the zone allocated buf log item is the maximum
1626 	 * size possible under XFS.  This wastes a little bit of memory,
1627 	 * but it is much faster.
1628 	 */
1629 	xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1630 					   "xfs_buf_item");
1631 	if (!xfs_buf_item_zone)
1632 		goto out_destroy_log_item_desc_zone;
1633 
1634 	xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1635 			((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1636 				 sizeof(xfs_extent_t))), "xfs_efd_item");
1637 	if (!xfs_efd_zone)
1638 		goto out_destroy_buf_item_zone;
1639 
1640 	xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1641 			((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1642 				sizeof(xfs_extent_t))), "xfs_efi_item");
1643 	if (!xfs_efi_zone)
1644 		goto out_destroy_efd_zone;
1645 
1646 	xfs_inode_zone =
1647 		kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1648 			KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1649 			xfs_fs_inode_init_once);
1650 	if (!xfs_inode_zone)
1651 		goto out_destroy_efi_zone;
1652 
1653 	xfs_ili_zone =
1654 		kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1655 					KM_ZONE_SPREAD, NULL);
1656 	if (!xfs_ili_zone)
1657 		goto out_destroy_inode_zone;
1658 	xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1659 					"xfs_icr");
1660 	if (!xfs_icreate_zone)
1661 		goto out_destroy_ili_zone;
1662 
1663 	return 0;
1664 
1665  out_destroy_ili_zone:
1666 	kmem_zone_destroy(xfs_ili_zone);
1667  out_destroy_inode_zone:
1668 	kmem_zone_destroy(xfs_inode_zone);
1669  out_destroy_efi_zone:
1670 	kmem_zone_destroy(xfs_efi_zone);
1671  out_destroy_efd_zone:
1672 	kmem_zone_destroy(xfs_efd_zone);
1673  out_destroy_buf_item_zone:
1674 	kmem_zone_destroy(xfs_buf_item_zone);
1675  out_destroy_log_item_desc_zone:
1676 	kmem_zone_destroy(xfs_log_item_desc_zone);
1677  out_destroy_trans_zone:
1678 	kmem_zone_destroy(xfs_trans_zone);
1679  out_destroy_ifork_zone:
1680 	kmem_zone_destroy(xfs_ifork_zone);
1681  out_destroy_da_state_zone:
1682 	kmem_zone_destroy(xfs_da_state_zone);
1683  out_destroy_btree_cur_zone:
1684 	kmem_zone_destroy(xfs_btree_cur_zone);
1685  out_destroy_bmap_free_item_zone:
1686 	kmem_zone_destroy(xfs_bmap_free_item_zone);
1687  out_destroy_log_ticket_zone:
1688 	kmem_zone_destroy(xfs_log_ticket_zone);
1689  out_destroy_ioend_pool:
1690 	mempool_destroy(xfs_ioend_pool);
1691  out_destroy_ioend_zone:
1692 	kmem_zone_destroy(xfs_ioend_zone);
1693  out:
1694 	return -ENOMEM;
1695 }
1696 
1697 STATIC void
1698 xfs_destroy_zones(void)
1699 {
1700 	/*
1701 	 * Make sure all delayed rcu free are flushed before we
1702 	 * destroy caches.
1703 	 */
1704 	rcu_barrier();
1705 	kmem_zone_destroy(xfs_icreate_zone);
1706 	kmem_zone_destroy(xfs_ili_zone);
1707 	kmem_zone_destroy(xfs_inode_zone);
1708 	kmem_zone_destroy(xfs_efi_zone);
1709 	kmem_zone_destroy(xfs_efd_zone);
1710 	kmem_zone_destroy(xfs_buf_item_zone);
1711 	kmem_zone_destroy(xfs_log_item_desc_zone);
1712 	kmem_zone_destroy(xfs_trans_zone);
1713 	kmem_zone_destroy(xfs_ifork_zone);
1714 	kmem_zone_destroy(xfs_da_state_zone);
1715 	kmem_zone_destroy(xfs_btree_cur_zone);
1716 	kmem_zone_destroy(xfs_bmap_free_item_zone);
1717 	kmem_zone_destroy(xfs_log_ticket_zone);
1718 	mempool_destroy(xfs_ioend_pool);
1719 	kmem_zone_destroy(xfs_ioend_zone);
1720 
1721 }
1722 
1723 STATIC int __init
1724 xfs_init_workqueues(void)
1725 {
1726 	/*
1727 	 * The allocation workqueue can be used in memory reclaim situations
1728 	 * (writepage path), and parallelism is only limited by the number of
1729 	 * AGs in all the filesystems mounted. Hence use the default large
1730 	 * max_active value for this workqueue.
1731 	 */
1732 	xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1733 	if (!xfs_alloc_wq)
1734 		return -ENOMEM;
1735 
1736 	return 0;
1737 }
1738 
1739 STATIC void
1740 xfs_destroy_workqueues(void)
1741 {
1742 	destroy_workqueue(xfs_alloc_wq);
1743 }
1744 
1745 STATIC int __init
1746 init_xfs_fs(void)
1747 {
1748 	int			error;
1749 
1750 	printk(KERN_INFO XFS_VERSION_STRING " with "
1751 			 XFS_BUILD_OPTIONS " enabled\n");
1752 
1753 	xfs_dir_startup();
1754 
1755 	error = xfs_init_zones();
1756 	if (error)
1757 		goto out;
1758 
1759 	error = xfs_init_workqueues();
1760 	if (error)
1761 		goto out_destroy_zones;
1762 
1763 	error = xfs_mru_cache_init();
1764 	if (error)
1765 		goto out_destroy_wq;
1766 
1767 	error = xfs_filestream_init();
1768 	if (error)
1769 		goto out_mru_cache_uninit;
1770 
1771 	error = xfs_buf_init();
1772 	if (error)
1773 		goto out_filestream_uninit;
1774 
1775 	error = xfs_init_procfs();
1776 	if (error)
1777 		goto out_buf_terminate;
1778 
1779 	error = xfs_sysctl_register();
1780 	if (error)
1781 		goto out_cleanup_procfs;
1782 
1783 	error = xfs_qm_init();
1784 	if (error)
1785 		goto out_sysctl_unregister;
1786 
1787 	error = register_filesystem(&xfs_fs_type);
1788 	if (error)
1789 		goto out_qm_exit;
1790 	return 0;
1791 
1792  out_qm_exit:
1793 	xfs_qm_exit();
1794  out_sysctl_unregister:
1795 	xfs_sysctl_unregister();
1796  out_cleanup_procfs:
1797 	xfs_cleanup_procfs();
1798  out_buf_terminate:
1799 	xfs_buf_terminate();
1800  out_filestream_uninit:
1801 	xfs_filestream_uninit();
1802  out_mru_cache_uninit:
1803 	xfs_mru_cache_uninit();
1804  out_destroy_wq:
1805 	xfs_destroy_workqueues();
1806  out_destroy_zones:
1807 	xfs_destroy_zones();
1808  out:
1809 	return error;
1810 }
1811 
1812 STATIC void __exit
1813 exit_xfs_fs(void)
1814 {
1815 	xfs_qm_exit();
1816 	unregister_filesystem(&xfs_fs_type);
1817 	xfs_sysctl_unregister();
1818 	xfs_cleanup_procfs();
1819 	xfs_buf_terminate();
1820 	xfs_filestream_uninit();
1821 	xfs_mru_cache_uninit();
1822 	xfs_destroy_workqueues();
1823 	xfs_destroy_zones();
1824 }
1825 
1826 module_init(init_xfs_fs);
1827 module_exit(exit_xfs_fs);
1828 
1829 MODULE_AUTHOR("Silicon Graphics, Inc.");
1830 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1831 MODULE_LICENSE("GPL");
1832