~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_super.c

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  4  * All Rights Reserved.
  5  */
  6 
  7 #include "xfs.h"
  8 #include "xfs_shared.h"
  9 #include "xfs_format.h"
 10 #include "xfs_log_format.h"
 11 #include "xfs_trans_resv.h"
 12 #include "xfs_sb.h"
 13 #include "xfs_mount.h"
 14 #include "xfs_inode.h"
 15 #include "xfs_btree.h"
 16 #include "xfs_bmap.h"
 17 #include "xfs_alloc.h"
 18 #include "xfs_fsops.h"
 19 #include "xfs_trans.h"
 20 #include "xfs_buf_item.h"
 21 #include "xfs_log.h"
 22 #include "xfs_log_priv.h"
 23 #include "xfs_dir2.h"
 24 #include "xfs_extfree_item.h"
 25 #include "xfs_mru_cache.h"
 26 #include "xfs_inode_item.h"
 27 #include "xfs_icache.h"
 28 #include "xfs_trace.h"
 29 #include "xfs_icreate_item.h"
 30 #include "xfs_filestream.h"
 31 #include "xfs_quota.h"
 32 #include "xfs_sysfs.h"
 33 #include "xfs_ondisk.h"
 34 #include "xfs_rmap_item.h"
 35 #include "xfs_refcount_item.h"
 36 #include "xfs_bmap_item.h"
 37 #include "xfs_reflink.h"
 38 #include "xfs_pwork.h"
 39 #include "xfs_ag.h"
 40 #include "xfs_defer.h"
 41 
 42 #include <linux/magic.h>
 43 #include <linux/fs_context.h>
 44 #include <linux/fs_parser.h>
 45 
 46 static const struct super_operations xfs_super_operations;
 47 
 48 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 49 #ifdef DEBUG
 50 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 51 #endif
 52 
 53 #ifdef CONFIG_HOTPLUG_CPU
 54 static LIST_HEAD(xfs_mount_list);
 55 static DEFINE_SPINLOCK(xfs_mount_list_lock);
 56 
 57 static inline void xfs_mount_list_add(struct xfs_mount *mp)
 58 {
 59         spin_lock(&xfs_mount_list_lock);
 60         list_add(&mp->m_mount_list, &xfs_mount_list);
 61         spin_unlock(&xfs_mount_list_lock);
 62 }
 63 
 64 static inline void xfs_mount_list_del(struct xfs_mount *mp)
 65 {
 66         spin_lock(&xfs_mount_list_lock);
 67         list_del(&mp->m_mount_list);
 68         spin_unlock(&xfs_mount_list_lock);
 69 }
 70 #else /* !CONFIG_HOTPLUG_CPU */
 71 static inline void xfs_mount_list_add(struct xfs_mount *mp) {}
 72 static inline void xfs_mount_list_del(struct xfs_mount *mp) {}
 73 #endif
 74 
 75 enum xfs_dax_mode {
 76         XFS_DAX_INODE = 0,
 77         XFS_DAX_ALWAYS = 1,
 78         XFS_DAX_NEVER = 2,
 79 };
 80 
 81 static void
 82 xfs_mount_set_dax_mode(
 83         struct xfs_mount        *mp,
 84         enum xfs_dax_mode       mode)
 85 {
 86         switch (mode) {
 87         case XFS_DAX_INODE:
 88                 mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER);
 89                 break;
 90         case XFS_DAX_ALWAYS:
 91                 mp->m_features |= XFS_FEAT_DAX_ALWAYS;
 92                 mp->m_features &= ~XFS_FEAT_DAX_NEVER;
 93                 break;
 94         case XFS_DAX_NEVER:
 95                 mp->m_features |= XFS_FEAT_DAX_NEVER;
 96                 mp->m_features &= ~XFS_FEAT_DAX_ALWAYS;
 97                 break;
 98         }
 99 }
100 
101 static const struct constant_table dax_param_enums[] = {
102         {"inode",       XFS_DAX_INODE },
103         {"always",      XFS_DAX_ALWAYS },
104         {"never",       XFS_DAX_NEVER },
105         {}
106 };
107 
108 /*
109  * Table driven mount option parser.
110  */
111 enum {
112         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
113         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
114         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
115         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
116         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
117         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
118         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
119         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
120         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
121 };
122 
123 static const struct fs_parameter_spec xfs_fs_parameters[] = {
124         fsparam_u32("logbufs",          Opt_logbufs),
125         fsparam_string("logbsize",      Opt_logbsize),
126         fsparam_string("logdev",        Opt_logdev),
127         fsparam_string("rtdev",         Opt_rtdev),
128         fsparam_flag("wsync",           Opt_wsync),
129         fsparam_flag("noalign",         Opt_noalign),
130         fsparam_flag("swalloc",         Opt_swalloc),
131         fsparam_u32("sunit",            Opt_sunit),
132         fsparam_u32("swidth",           Opt_swidth),
133         fsparam_flag("nouuid",          Opt_nouuid),
134         fsparam_flag("grpid",           Opt_grpid),
135         fsparam_flag("nogrpid",         Opt_nogrpid),
136         fsparam_flag("bsdgroups",       Opt_bsdgroups),
137         fsparam_flag("sysvgroups",      Opt_sysvgroups),
138         fsparam_string("allocsize",     Opt_allocsize),
139         fsparam_flag("norecovery",      Opt_norecovery),
140         fsparam_flag("inode64",         Opt_inode64),
141         fsparam_flag("inode32",         Opt_inode32),
142         fsparam_flag("ikeep",           Opt_ikeep),
143         fsparam_flag("noikeep",         Opt_noikeep),
144         fsparam_flag("largeio",         Opt_largeio),
145         fsparam_flag("nolargeio",       Opt_nolargeio),
146         fsparam_flag("attr2",           Opt_attr2),
147         fsparam_flag("noattr2",         Opt_noattr2),
148         fsparam_flag("filestreams",     Opt_filestreams),
149         fsparam_flag("quota",           Opt_quota),
150         fsparam_flag("noquota",         Opt_noquota),
151         fsparam_flag("usrquota",        Opt_usrquota),
152         fsparam_flag("grpquota",        Opt_grpquota),
153         fsparam_flag("prjquota",        Opt_prjquota),
154         fsparam_flag("uquota",          Opt_uquota),
155         fsparam_flag("gquota",          Opt_gquota),
156         fsparam_flag("pquota",          Opt_pquota),
157         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
158         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
159         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
160         fsparam_flag("qnoenforce",      Opt_qnoenforce),
161         fsparam_flag("discard",         Opt_discard),
162         fsparam_flag("nodiscard",       Opt_nodiscard),
163         fsparam_flag("dax",             Opt_dax),
164         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
165         {}
166 };
167 
168 struct proc_xfs_info {
169         uint64_t        flag;
170         char            *str;
171 };
172 
173 static int
174 xfs_fs_show_options(
175         struct seq_file         *m,
176         struct dentry           *root)
177 {
178         static struct proc_xfs_info xfs_info_set[] = {
179                 /* the few simple ones we can get from the mount struct */
180                 { XFS_FEAT_IKEEP,               ",ikeep" },
181                 { XFS_FEAT_WSYNC,               ",wsync" },
182                 { XFS_FEAT_NOALIGN,             ",noalign" },
183                 { XFS_FEAT_SWALLOC,             ",swalloc" },
184                 { XFS_FEAT_NOUUID,              ",nouuid" },
185                 { XFS_FEAT_NORECOVERY,          ",norecovery" },
186                 { XFS_FEAT_ATTR2,               ",attr2" },
187                 { XFS_FEAT_FILESTREAMS,         ",filestreams" },
188                 { XFS_FEAT_GRPID,               ",grpid" },
189                 { XFS_FEAT_DISCARD,             ",discard" },
190                 { XFS_FEAT_LARGE_IOSIZE,        ",largeio" },
191                 { XFS_FEAT_DAX_ALWAYS,          ",dax=always" },
192                 { XFS_FEAT_DAX_NEVER,           ",dax=never" },
193                 { 0, NULL }
194         };
195         struct xfs_mount        *mp = XFS_M(root->d_sb);
196         struct proc_xfs_info    *xfs_infop;
197 
198         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
199                 if (mp->m_features & xfs_infop->flag)
200                         seq_puts(m, xfs_infop->str);
201         }
202 
203         seq_printf(m, ",inode%d", xfs_has_small_inums(mp) ? 32 : 64);
204 
205         if (xfs_has_allocsize(mp))
206                 seq_printf(m, ",allocsize=%dk",
207                            (1 << mp->m_allocsize_log) >> 10);
208 
209         if (mp->m_logbufs > 0)
210                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
211         if (mp->m_logbsize > 0)
212                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
213 
214         if (mp->m_logname)
215                 seq_show_option(m, "logdev", mp->m_logname);
216         if (mp->m_rtname)
217                 seq_show_option(m, "rtdev", mp->m_rtname);
218 
219         if (mp->m_dalign > 0)
220                 seq_printf(m, ",sunit=%d",
221                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
222         if (mp->m_swidth > 0)
223                 seq_printf(m, ",swidth=%d",
224                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
225 
226         if (mp->m_qflags & XFS_UQUOTA_ENFD)
227                 seq_puts(m, ",usrquota");
228         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
229                 seq_puts(m, ",uqnoenforce");
230 
231         if (mp->m_qflags & XFS_PQUOTA_ENFD)
232                 seq_puts(m, ",prjquota");
233         else if (mp->m_qflags & XFS_PQUOTA_ACCT)
234                 seq_puts(m, ",pqnoenforce");
235 
236         if (mp->m_qflags & XFS_GQUOTA_ENFD)
237                 seq_puts(m, ",grpquota");
238         else if (mp->m_qflags & XFS_GQUOTA_ACCT)
239                 seq_puts(m, ",gqnoenforce");
240 
241         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
242                 seq_puts(m, ",noquota");
243 
244         return 0;
245 }
246 
247 /*
248  * Set parameters for inode allocation heuristics, taking into account
249  * filesystem size and inode32/inode64 mount options; i.e. specifically
250  * whether or not XFS_FEAT_SMALL_INUMS is set.
251  *
252  * Inode allocation patterns are altered only if inode32 is requested
253  * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large.
254  * If altered, XFS_OPSTATE_INODE32 is set as well.
255  *
256  * An agcount independent of that in the mount structure is provided
257  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
258  * to the potentially higher ag count.
259  *
260  * Returns the maximum AG index which may contain inodes.
261  */
262 xfs_agnumber_t
263 xfs_set_inode_alloc(
264         struct xfs_mount *mp,
265         xfs_agnumber_t  agcount)
266 {
267         xfs_agnumber_t  index;
268         xfs_agnumber_t  maxagi = 0;
269         xfs_sb_t        *sbp = &mp->m_sb;
270         xfs_agnumber_t  max_metadata;
271         xfs_agino_t     agino;
272         xfs_ino_t       ino;
273 
274         /*
275          * Calculate how much should be reserved for inodes to meet
276          * the max inode percentage.  Used only for inode32.
277          */
278         if (M_IGEO(mp)->maxicount) {
279                 uint64_t        icount;
280 
281                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
282                 do_div(icount, 100);
283                 icount += sbp->sb_agblocks - 1;
284                 do_div(icount, sbp->sb_agblocks);
285                 max_metadata = icount;
286         } else {
287                 max_metadata = agcount;
288         }
289 
290         /* Get the last possible inode in the filesystem */
291         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
292         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
293 
294         /*
295          * If user asked for no more than 32-bit inodes, and the fs is
296          * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter
297          * the allocator to accommodate the request.
298          */
299         if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32)
300                 set_bit(XFS_OPSTATE_INODE32, &mp->m_opstate);
301         else
302                 clear_bit(XFS_OPSTATE_INODE32, &mp->m_opstate);
303 
304         for (index = 0; index < agcount; index++) {
305                 struct xfs_perag        *pag;
306 
307                 ino = XFS_AGINO_TO_INO(mp, index, agino);
308 
309                 pag = xfs_perag_get(mp, index);
310 
311                 if (xfs_is_inode32(mp)) {
312                         if (ino > XFS_MAXINUMBER_32) {
313                                 pag->pagi_inodeok = 0;
314                                 pag->pagf_metadata = 0;
315                         } else {
316                                 pag->pagi_inodeok = 1;
317                                 maxagi++;
318                                 if (index < max_metadata)
319                                         pag->pagf_metadata = 1;
320                                 else
321                                         pag->pagf_metadata = 0;
322                         }
323                 } else {
324                         pag->pagi_inodeok = 1;
325                         pag->pagf_metadata = 0;
326                 }
327 
328                 xfs_perag_put(pag);
329         }
330 
331         return xfs_is_inode32(mp) ? maxagi : agcount;
332 }
333 
334 static bool
335 xfs_buftarg_is_dax(
336         struct super_block      *sb,
337         struct xfs_buftarg      *bt)
338 {
339         return dax_supported(bt->bt_daxdev, bt->bt_bdev, sb->s_blocksize, 0,
340                         bdev_nr_sectors(bt->bt_bdev));
341 }
342 
343 STATIC int
344 xfs_blkdev_get(
345         xfs_mount_t             *mp,
346         const char              *name,
347         struct block_device     **bdevp)
348 {
349         int                     error = 0;
350 
351         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
352                                     mp);
353         if (IS_ERR(*bdevp)) {
354                 error = PTR_ERR(*bdevp);
355                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
356         }
357 
358         return error;
359 }
360 
361 STATIC void
362 xfs_blkdev_put(
363         struct block_device     *bdev)
364 {
365         if (bdev)
366                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
367 }
368 
369 STATIC void
370 xfs_close_devices(
371         struct xfs_mount        *mp)
372 {
373         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
374 
375         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
376                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
377                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
378 
379                 xfs_free_buftarg(mp->m_logdev_targp);
380                 xfs_blkdev_put(logdev);
381                 fs_put_dax(dax_logdev);
382         }
383         if (mp->m_rtdev_targp) {
384                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
385                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
386 
387                 xfs_free_buftarg(mp->m_rtdev_targp);
388                 xfs_blkdev_put(rtdev);
389                 fs_put_dax(dax_rtdev);
390         }
391         xfs_free_buftarg(mp->m_ddev_targp);
392         fs_put_dax(dax_ddev);
393 }
394 
395 /*
396  * The file system configurations are:
397  *      (1) device (partition) with data and internal log
398  *      (2) logical volume with data and log subvolumes.
399  *      (3) logical volume with data, log, and realtime subvolumes.
400  *
401  * We only have to handle opening the log and realtime volumes here if
402  * they are present.  The data subvolume has already been opened by
403  * get_sb_bdev() and is stored in sb->s_bdev.
404  */
405 STATIC int
406 xfs_open_devices(
407         struct xfs_mount        *mp)
408 {
409         struct block_device     *ddev = mp->m_super->s_bdev;
410         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
411         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
412         struct block_device     *logdev = NULL, *rtdev = NULL;
413         int                     error;
414 
415         /*
416          * Open real time and log devices - order is important.
417          */
418         if (mp->m_logname) {
419                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
420                 if (error)
421                         goto out;
422                 dax_logdev = fs_dax_get_by_bdev(logdev);
423         }
424 
425         if (mp->m_rtname) {
426                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
427                 if (error)
428                         goto out_close_logdev;
429 
430                 if (rtdev == ddev || rtdev == logdev) {
431                         xfs_warn(mp,
432         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
433                         error = -EINVAL;
434                         goto out_close_rtdev;
435                 }
436                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
437         }
438 
439         /*
440          * Setup xfs_mount buffer target pointers
441          */
442         error = -ENOMEM;
443         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
444         if (!mp->m_ddev_targp)
445                 goto out_close_rtdev;
446 
447         if (rtdev) {
448                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
449                 if (!mp->m_rtdev_targp)
450                         goto out_free_ddev_targ;
451         }
452 
453         if (logdev && logdev != ddev) {
454                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
455                 if (!mp->m_logdev_targp)
456                         goto out_free_rtdev_targ;
457         } else {
458                 mp->m_logdev_targp = mp->m_ddev_targp;
459         }
460 
461         return 0;
462 
463  out_free_rtdev_targ:
464         if (mp->m_rtdev_targp)
465                 xfs_free_buftarg(mp->m_rtdev_targp);
466  out_free_ddev_targ:
467         xfs_free_buftarg(mp->m_ddev_targp);
468  out_close_rtdev:
469         xfs_blkdev_put(rtdev);
470         fs_put_dax(dax_rtdev);
471  out_close_logdev:
472         if (logdev && logdev != ddev) {
473                 xfs_blkdev_put(logdev);
474                 fs_put_dax(dax_logdev);
475         }
476  out:
477         fs_put_dax(dax_ddev);
478         return error;
479 }
480 
481 /*
482  * Setup xfs_mount buffer target pointers based on superblock
483  */
484 STATIC int
485 xfs_setup_devices(
486         struct xfs_mount        *mp)
487 {
488         int                     error;
489 
490         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
491         if (error)
492                 return error;
493 
494         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
495                 unsigned int    log_sector_size = BBSIZE;
496 
497                 if (xfs_has_sector(mp))
498                         log_sector_size = mp->m_sb.sb_logsectsize;
499                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
500                                             log_sector_size);
501                 if (error)
502                         return error;
503         }
504         if (mp->m_rtdev_targp) {
505                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
506                                             mp->m_sb.sb_sectsize);
507                 if (error)
508                         return error;
509         }
510 
511         return 0;
512 }
513 
514 STATIC int
515 xfs_init_mount_workqueues(
516         struct xfs_mount        *mp)
517 {
518         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
519                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
520                         1, mp->m_super->s_id);
521         if (!mp->m_buf_workqueue)
522                 goto out;
523 
524         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
525                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
526                         0, mp->m_super->s_id);
527         if (!mp->m_unwritten_workqueue)
528                 goto out_destroy_buf;
529 
530         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
531                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
532                         0, mp->m_super->s_id);
533         if (!mp->m_reclaim_workqueue)
534                 goto out_destroy_unwritten;
535 
536         mp->m_blockgc_wq = alloc_workqueue("xfs-blockgc/%s",
537                         XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
538                         0, mp->m_super->s_id);
539         if (!mp->m_blockgc_wq)
540                 goto out_destroy_reclaim;
541 
542         mp->m_inodegc_wq = alloc_workqueue("xfs-inodegc/%s",
543                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
544                         1, mp->m_super->s_id);
545         if (!mp->m_inodegc_wq)
546                 goto out_destroy_blockgc;
547 
548         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
549                         XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
550         if (!mp->m_sync_workqueue)
551                 goto out_destroy_inodegc;
552 
553         return 0;
554 
555 out_destroy_inodegc:
556         destroy_workqueue(mp->m_inodegc_wq);
557 out_destroy_blockgc:
558         destroy_workqueue(mp->m_blockgc_wq);
559 out_destroy_reclaim:
560         destroy_workqueue(mp->m_reclaim_workqueue);
561 out_destroy_unwritten:
562         destroy_workqueue(mp->m_unwritten_workqueue);
563 out_destroy_buf:
564         destroy_workqueue(mp->m_buf_workqueue);
565 out:
566         return -ENOMEM;
567 }
568 
569 STATIC void
570 xfs_destroy_mount_workqueues(
571         struct xfs_mount        *mp)
572 {
573         destroy_workqueue(mp->m_sync_workqueue);
574         destroy_workqueue(mp->m_blockgc_wq);
575         destroy_workqueue(mp->m_inodegc_wq);
576         destroy_workqueue(mp->m_reclaim_workqueue);
577         destroy_workqueue(mp->m_unwritten_workqueue);
578         destroy_workqueue(mp->m_buf_workqueue);
579 }
580 
581 static void
582 xfs_flush_inodes_worker(
583         struct work_struct      *work)
584 {
585         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
586                                                    m_flush_inodes_work);
587         struct super_block      *sb = mp->m_super;
588 
589         if (down_read_trylock(&sb->s_umount)) {
590                 sync_inodes_sb(sb);
591                 up_read(&sb->s_umount);
592         }
593 }
594 
595 /*
596  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
597  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
598  * for IO to complete so that we effectively throttle multiple callers to the
599  * rate at which IO is completing.
600  */
601 void
602 xfs_flush_inodes(
603         struct xfs_mount        *mp)
604 {
605         /*
606          * If flush_work() returns true then that means we waited for a flush
607          * which was already in progress.  Don't bother running another scan.
608          */
609         if (flush_work(&mp->m_flush_inodes_work))
610                 return;
611 
612         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
613         flush_work(&mp->m_flush_inodes_work);
614 }
615 
616 /* Catch misguided souls that try to use this interface on XFS */
617 STATIC struct inode *
618 xfs_fs_alloc_inode(
619         struct super_block      *sb)
620 {
621         BUG();
622         return NULL;
623 }
624 
625 /*
626  * Now that the generic code is guaranteed not to be accessing
627  * the linux inode, we can inactivate and reclaim the inode.
628  */
629 STATIC void
630 xfs_fs_destroy_inode(
631         struct inode            *inode)
632 {
633         struct xfs_inode        *ip = XFS_I(inode);
634 
635         trace_xfs_destroy_inode(ip);
636 
637         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
638         XFS_STATS_INC(ip->i_mount, vn_rele);
639         XFS_STATS_INC(ip->i_mount, vn_remove);
640         xfs_inode_mark_reclaimable(ip);
641 }
642 
643 static void
644 xfs_fs_dirty_inode(
645         struct inode                    *inode,
646         int                             flag)
647 {
648         struct xfs_inode                *ip = XFS_I(inode);
649         struct xfs_mount                *mp = ip->i_mount;
650         struct xfs_trans                *tp;
651 
652         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
653                 return;
654         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
655                 return;
656 
657         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
658                 return;
659         xfs_ilock(ip, XFS_ILOCK_EXCL);
660         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
661         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
662         xfs_trans_commit(tp);
663 }
664 
665 /*
666  * Slab object creation initialisation for the XFS inode.
667  * This covers only the idempotent fields in the XFS inode;
668  * all other fields need to be initialised on allocation
669  * from the slab. This avoids the need to repeatedly initialise
670  * fields in the xfs inode that left in the initialise state
671  * when freeing the inode.
672  */
673 STATIC void
674 xfs_fs_inode_init_once(
675         void                    *inode)
676 {
677         struct xfs_inode        *ip = inode;
678 
679         memset(ip, 0, sizeof(struct xfs_inode));
680 
681         /* vfs inode */
682         inode_init_once(VFS_I(ip));
683 
684         /* xfs inode */
685         atomic_set(&ip->i_pincount, 0);
686         spin_lock_init(&ip->i_flags_lock);
687 
688         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
689                      "xfsino", ip->i_ino);
690 }
691 
692 /*
693  * We do an unlocked check for XFS_IDONTCACHE here because we are already
694  * serialised against cache hits here via the inode->i_lock and igrab() in
695  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
696  * racing with us, and it avoids needing to grab a spinlock here for every inode
697  * we drop the final reference on.
698  */
699 STATIC int
700 xfs_fs_drop_inode(
701         struct inode            *inode)
702 {
703         struct xfs_inode        *ip = XFS_I(inode);
704 
705         /*
706          * If this unlinked inode is in the middle of recovery, don't
707          * drop the inode just yet; log recovery will take care of
708          * that.  See the comment for this inode flag.
709          */
710         if (ip->i_flags & XFS_IRECOVERY) {
711                 ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
712                 return 0;
713         }
714 
715         return generic_drop_inode(inode);
716 }
717 
718 static void
719 xfs_mount_free(
720         struct xfs_mount        *mp)
721 {
722         kfree(mp->m_rtname);
723         kfree(mp->m_logname);
724         kmem_free(mp);
725 }
726 
727 STATIC int
728 xfs_fs_sync_fs(
729         struct super_block      *sb,
730         int                     wait)
731 {
732         struct xfs_mount        *mp = XFS_M(sb);
733 
734         trace_xfs_fs_sync_fs(mp, __return_address);
735 
736         /*
737          * Doing anything during the async pass would be counterproductive.
738          */
739         if (!wait)
740                 return 0;
741 
742         xfs_log_force(mp, XFS_LOG_SYNC);
743         if (laptop_mode) {
744                 /*
745                  * The disk must be active because we're syncing.
746                  * We schedule log work now (now that the disk is
747                  * active) instead of later (when it might not be).
748                  */
749                 flush_delayed_work(&mp->m_log->l_work);
750         }
751 
752         /*
753          * If we are called with page faults frozen out, it means we are about
754          * to freeze the transaction subsystem. Take the opportunity to shut
755          * down inodegc because once SB_FREEZE_FS is set it's too late to
756          * prevent inactivation races with freeze. The fs doesn't get called
757          * again by the freezing process until after SB_FREEZE_FS has been set,
758          * so it's now or never.  Same logic applies to speculative allocation
759          * garbage collection.
760          *
761          * We don't care if this is a normal syncfs call that does this or
762          * freeze that does this - we can run this multiple times without issue
763          * and we won't race with a restart because a restart can only occur
764          * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
765          */
766         if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
767                 xfs_inodegc_stop(mp);
768                 xfs_blockgc_stop(mp);
769         }
770 
771         return 0;
772 }
773 
774 STATIC int
775 xfs_fs_statfs(
776         struct dentry           *dentry,
777         struct kstatfs          *statp)
778 {
779         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
780         xfs_sb_t                *sbp = &mp->m_sb;
781         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
782         uint64_t                fakeinos, id;
783         uint64_t                icount;
784         uint64_t                ifree;
785         uint64_t                fdblocks;
786         xfs_extlen_t            lsize;
787         int64_t                 ffree;
788 
789         /* Wait for whatever inactivations are in progress. */
790         xfs_inodegc_flush(mp);
791 
792         statp->f_type = XFS_SUPER_MAGIC;
793         statp->f_namelen = MAXNAMELEN - 1;
794 
795         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
796         statp->f_fsid = u64_to_fsid(id);
797 
798         icount = percpu_counter_sum(&mp->m_icount);
799         ifree = percpu_counter_sum(&mp->m_ifree);
800         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
801 
802         spin_lock(&mp->m_sb_lock);
803         statp->f_bsize = sbp->sb_blocksize;
804         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
805         statp->f_blocks = sbp->sb_dblocks - lsize;
806         spin_unlock(&mp->m_sb_lock);
807 
808         /* make sure statp->f_bfree does not underflow */
809         statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
810         statp->f_bavail = statp->f_bfree;
811 
812         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
813         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
814         if (M_IGEO(mp)->maxicount)
815                 statp->f_files = min_t(typeof(statp->f_files),
816                                         statp->f_files,
817                                         M_IGEO(mp)->maxicount);
818 
819         /* If sb_icount overshot maxicount, report actual allocation */
820         statp->f_files = max_t(typeof(statp->f_files),
821                                         statp->f_files,
822                                         sbp->sb_icount);
823 
824         /* make sure statp->f_ffree does not underflow */
825         ffree = statp->f_files - (icount - ifree);
826         statp->f_ffree = max_t(int64_t, ffree, 0);
827 
828 
829         if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
830             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
831                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
832                 xfs_qm_statvfs(ip, statp);
833 
834         if (XFS_IS_REALTIME_MOUNT(mp) &&
835             (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
836                 statp->f_blocks = sbp->sb_rblocks;
837                 statp->f_bavail = statp->f_bfree =
838                         sbp->sb_frextents * sbp->sb_rextsize;
839         }
840 
841         return 0;
842 }
843 
844 STATIC void
845 xfs_save_resvblks(struct xfs_mount *mp)
846 {
847         uint64_t resblks = 0;
848 
849         mp->m_resblks_save = mp->m_resblks;
850         xfs_reserve_blocks(mp, &resblks, NULL);
851 }
852 
853 STATIC void
854 xfs_restore_resvblks(struct xfs_mount *mp)
855 {
856         uint64_t resblks;
857 
858         if (mp->m_resblks_save) {
859                 resblks = mp->m_resblks_save;
860                 mp->m_resblks_save = 0;
861         } else
862                 resblks = xfs_default_resblks(mp);
863 
864         xfs_reserve_blocks(mp, &resblks, NULL);
865 }
866 
867 /*
868  * Second stage of a freeze. The data is already frozen so we only
869  * need to take care of the metadata. Once that's done sync the superblock
870  * to the log to dirty it in case of a crash while frozen. This ensures that we
871  * will recover the unlinked inode lists on the next mount.
872  */
873 STATIC int
874 xfs_fs_freeze(
875         struct super_block      *sb)
876 {
877         struct xfs_mount        *mp = XFS_M(sb);
878         unsigned int            flags;
879         int                     ret;
880 
881         /*
882          * The filesystem is now frozen far enough that memory reclaim
883          * cannot safely operate on the filesystem. Hence we need to
884          * set a GFP_NOFS context here to avoid recursion deadlocks.
885          */
886         flags = memalloc_nofs_save();
887         xfs_save_resvblks(mp);
888         ret = xfs_log_quiesce(mp);
889         memalloc_nofs_restore(flags);
890 
891         /*
892          * For read-write filesystems, we need to restart the inodegc on error
893          * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
894          * going to be run to restart it now.  We are at SB_FREEZE_FS level
895          * here, so we can restart safely without racing with a stop in
896          * xfs_fs_sync_fs().
897          */
898         if (ret && !xfs_is_readonly(mp)) {
899                 xfs_blockgc_start(mp);
900                 xfs_inodegc_start(mp);
901         }
902 
903         return ret;
904 }
905 
906 STATIC int
907 xfs_fs_unfreeze(
908         struct super_block      *sb)
909 {
910         struct xfs_mount        *mp = XFS_M(sb);
911 
912         xfs_restore_resvblks(mp);
913         xfs_log_work_queue(mp);
914 
915         /*
916          * Don't reactivate the inodegc worker on a readonly filesystem because
917          * inodes are sent directly to reclaim.  Don't reactivate the blockgc
918          * worker because there are no speculative preallocations on a readonly
919          * filesystem.
920          */
921         if (!xfs_is_readonly(mp)) {
922                 xfs_blockgc_start(mp);
923                 xfs_inodegc_start(mp);
924         }
925 
926         return 0;
927 }
928 
929 /*
930  * This function fills in xfs_mount_t fields based on mount args.
931  * Note: the superblock _has_ now been read in.
932  */
933 STATIC int
934 xfs_finish_flags(
935         struct xfs_mount        *mp)
936 {
937         /* Fail a mount where the logbuf is smaller than the log stripe */
938         if (xfs_has_logv2(mp)) {
939                 if (mp->m_logbsize <= 0 &&
940                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
941                         mp->m_logbsize = mp->m_sb.sb_logsunit;
942                 } else if (mp->m_logbsize > 0 &&
943                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
944                         xfs_warn(mp,
945                 "logbuf size must be greater than or equal to log stripe size");
946                         return -EINVAL;
947                 }
948         } else {
949                 /* Fail a mount if the logbuf is larger than 32K */
950                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
951                         xfs_warn(mp,
952                 "logbuf size for version 1 logs must be 16K or 32K");
953                         return -EINVAL;
954                 }
955         }
956 
957         /*
958          * V5 filesystems always use attr2 format for attributes.
959          */
960         if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
961                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
962                              "attr2 is always enabled for V5 filesystems.");
963                 return -EINVAL;
964         }
965 
966         /*
967          * prohibit r/w mounts of read-only filesystems
968          */
969         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
970                 xfs_warn(mp,
971                         "cannot mount a read-only filesystem as read-write");
972                 return -EROFS;
973         }
974 
975         if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
976             (mp->m_qflags & XFS_PQUOTA_ACCT) &&
977             !xfs_has_pquotino(mp)) {
978                 xfs_warn(mp,
979                   "Super block does not support project and group quota together");
980                 return -EINVAL;
981         }
982 
983         return 0;
984 }
985 
986 static int
987 xfs_init_percpu_counters(
988         struct xfs_mount        *mp)
989 {
990         int             error;
991 
992         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
993         if (error)
994                 return -ENOMEM;
995 
996         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
997         if (error)
998                 goto free_icount;
999 
1000         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1001         if (error)
1002                 goto free_ifree;
1003 
1004         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1005         if (error)
1006                 goto free_fdblocks;
1007 
1008         return 0;
1009 
1010 free_fdblocks:
1011         percpu_counter_destroy(&mp->m_fdblocks);
1012 free_ifree:
1013         percpu_counter_destroy(&mp->m_ifree);
1014 free_icount:
1015         percpu_counter_destroy(&mp->m_icount);
1016         return -ENOMEM;
1017 }
1018 
1019 void
1020 xfs_reinit_percpu_counters(
1021         struct xfs_mount        *mp)
1022 {
1023         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1024         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1025         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1026 }
1027 
1028 static void
1029 xfs_destroy_percpu_counters(
1030         struct xfs_mount        *mp)
1031 {
1032         percpu_counter_destroy(&mp->m_icount);
1033         percpu_counter_destroy(&mp->m_ifree);
1034         percpu_counter_destroy(&mp->m_fdblocks);
1035         ASSERT(xfs_is_shutdown(mp) ||
1036                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1037         percpu_counter_destroy(&mp->m_delalloc_blks);
1038 }
1039 
1040 static int
1041 xfs_inodegc_init_percpu(
1042         struct xfs_mount        *mp)
1043 {
1044         struct xfs_inodegc      *gc;
1045         int                     cpu;
1046 
1047         mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
1048         if (!mp->m_inodegc)
1049                 return -ENOMEM;
1050 
1051         for_each_possible_cpu(cpu) {
1052                 gc = per_cpu_ptr(mp->m_inodegc, cpu);
1053                 init_llist_head(&gc->list);
1054                 gc->items = 0;
1055                 INIT_WORK(&gc->work, xfs_inodegc_worker);
1056         }
1057         return 0;
1058 }
1059 
1060 static void
1061 xfs_inodegc_free_percpu(
1062         struct xfs_mount        *mp)
1063 {
1064         if (!mp->m_inodegc)
1065                 return;
1066         free_percpu(mp->m_inodegc);
1067 }
1068 
1069 static void
1070 xfs_fs_put_super(
1071         struct super_block      *sb)
1072 {
1073         struct xfs_mount        *mp = XFS_M(sb);
1074 
1075         /* if ->fill_super failed, we have no mount to tear down */
1076         if (!sb->s_fs_info)
1077                 return;
1078 
1079         xfs_notice(mp, "Unmounting Filesystem");
1080         xfs_filestream_unmount(mp);
1081         xfs_unmountfs(mp);
1082 
1083         xfs_freesb(mp);
1084         free_percpu(mp->m_stats.xs_stats);
1085         xfs_mount_list_del(mp);
1086         xfs_inodegc_free_percpu(mp);
1087         xfs_destroy_percpu_counters(mp);
1088         xfs_destroy_mount_workqueues(mp);
1089         xfs_close_devices(mp);
1090 
1091         sb->s_fs_info = NULL;
1092         xfs_mount_free(mp);
1093 }
1094 
1095 static long
1096 xfs_fs_nr_cached_objects(
1097         struct super_block      *sb,
1098         struct shrink_control   *sc)
1099 {
1100         /* Paranoia: catch incorrect calls during mount setup or teardown */
1101         if (WARN_ON_ONCE(!sb->s_fs_info))
1102                 return 0;
1103         return xfs_reclaim_inodes_count(XFS_M(sb));
1104 }
1105 
1106 static long
1107 xfs_fs_free_cached_objects(
1108         struct super_block      *sb,
1109         struct shrink_control   *sc)
1110 {
1111         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1112 }
1113 
1114 static const struct super_operations xfs_super_operations = {
1115         .alloc_inode            = xfs_fs_alloc_inode,
1116         .destroy_inode          = xfs_fs_destroy_inode,
1117         .dirty_inode            = xfs_fs_dirty_inode,
1118         .drop_inode             = xfs_fs_drop_inode,
1119         .put_super              = xfs_fs_put_super,
1120         .sync_fs                = xfs_fs_sync_fs,
1121         .freeze_fs              = xfs_fs_freeze,
1122         .unfreeze_fs            = xfs_fs_unfreeze,
1123         .statfs                 = xfs_fs_statfs,
1124         .show_options           = xfs_fs_show_options,
1125         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1126         .free_cached_objects    = xfs_fs_free_cached_objects,
1127 };
1128 
1129 static int
1130 suffix_kstrtoint(
1131         const char      *s,
1132         unsigned int    base,
1133         int             *res)
1134 {
1135         int             last, shift_left_factor = 0, _res;
1136         char            *value;
1137         int             ret = 0;
1138 
1139         value = kstrdup(s, GFP_KERNEL);
1140         if (!value)
1141                 return -ENOMEM;
1142 
1143         last = strlen(value) - 1;
1144         if (value[last] == 'K' || value[last] == 'k') {
1145                 shift_left_factor = 10;
1146                 value[last] = '\0';
1147         }
1148         if (value[last] == 'M' || value[last] == 'm') {
1149                 shift_left_factor = 20;
1150                 value[last] = '\0';
1151         }
1152         if (value[last] == 'G' || value[last] == 'g') {
1153                 shift_left_factor = 30;
1154                 value[last] = '\0';
1155         }
1156 
1157         if (kstrtoint(value, base, &_res))
1158                 ret = -EINVAL;
1159         kfree(value);
1160         *res = _res << shift_left_factor;
1161         return ret;
1162 }
1163 
1164 static inline void
1165 xfs_fs_warn_deprecated(
1166         struct fs_context       *fc,
1167         struct fs_parameter     *param,
1168         uint64_t                flag,
1169         bool                    value)
1170 {
1171         /* Don't print the warning if reconfiguring and current mount point
1172          * already had the flag set
1173          */
1174         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1175             !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
1176                 return;
1177         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1178 }
1179 
1180 /*
1181  * Set mount state from a mount option.
1182  *
1183  * NOTE: mp->m_super is NULL here!
1184  */
1185 static int
1186 xfs_fs_parse_param(
1187         struct fs_context       *fc,
1188         struct fs_parameter     *param)
1189 {
1190         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1191         struct fs_parse_result  result;
1192         int                     size = 0;
1193         int                     opt;
1194 
1195         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1196         if (opt < 0)
1197                 return opt;
1198 
1199         switch (opt) {
1200         case Opt_logbufs:
1201                 parsing_mp->m_logbufs = result.uint_32;
1202                 return 0;
1203         case Opt_logbsize:
1204                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1205                         return -EINVAL;
1206                 return 0;
1207         case Opt_logdev:
1208                 kfree(parsing_mp->m_logname);
1209                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1210                 if (!parsing_mp->m_logname)
1211                         return -ENOMEM;
1212                 return 0;
1213         case Opt_rtdev:
1214                 kfree(parsing_mp->m_rtname);
1215                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1216                 if (!parsing_mp->m_rtname)
1217                         return -ENOMEM;
1218                 return 0;
1219         case Opt_allocsize:
1220                 if (suffix_kstrtoint(param->string, 10, &size))
1221                         return -EINVAL;
1222                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1223                 parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
1224                 return 0;
1225         case Opt_grpid:
1226         case Opt_bsdgroups:
1227                 parsing_mp->m_features |= XFS_FEAT_GRPID;
1228                 return 0;
1229         case Opt_nogrpid:
1230         case Opt_sysvgroups:
1231                 parsing_mp->m_features &= ~XFS_FEAT_GRPID;
1232                 return 0;
1233         case Opt_wsync:
1234                 parsing_mp->m_features |= XFS_FEAT_WSYNC;
1235                 return 0;
1236         case Opt_norecovery:
1237                 parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
1238                 return 0;
1239         case Opt_noalign:
1240                 parsing_mp->m_features |= XFS_FEAT_NOALIGN;
1241                 return 0;
1242         case Opt_swalloc:
1243                 parsing_mp->m_features |= XFS_FEAT_SWALLOC;
1244                 return 0;
1245         case Opt_sunit:
1246                 parsing_mp->m_dalign = result.uint_32;
1247                 return 0;
1248         case Opt_swidth:
1249                 parsing_mp->m_swidth = result.uint_32;
1250                 return 0;
1251         case Opt_inode32:
1252                 parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
1253                 return 0;
1254         case Opt_inode64:
1255                 parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1256                 return 0;
1257         case Opt_nouuid:
1258                 parsing_mp->m_features |= XFS_FEAT_NOUUID;
1259                 return 0;
1260         case Opt_largeio:
1261                 parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
1262                 return 0;
1263         case Opt_nolargeio:
1264                 parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
1265                 return 0;
1266         case Opt_filestreams:
1267                 parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
1268                 return 0;
1269         case Opt_noquota:
1270                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1271                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1272                 return 0;
1273         case Opt_quota:
1274         case Opt_uquota:
1275         case Opt_usrquota:
1276                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
1277                 return 0;
1278         case Opt_qnoenforce:
1279         case Opt_uqnoenforce:
1280                 parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
1281                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1282                 return 0;
1283         case Opt_pquota:
1284         case Opt_prjquota:
1285                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
1286                 return 0;
1287         case Opt_pqnoenforce:
1288                 parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
1289                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1290                 return 0;
1291         case Opt_gquota:
1292         case Opt_grpquota:
1293                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
1294                 return 0;
1295         case Opt_gqnoenforce:
1296                 parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
1297                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1298                 return 0;
1299         case Opt_discard:
1300                 parsing_mp->m_features |= XFS_FEAT_DISCARD;
1301                 return 0;
1302         case Opt_nodiscard:
1303                 parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
1304                 return 0;
1305 #ifdef CONFIG_FS_DAX
1306         case Opt_dax:
1307                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1308                 return 0;
1309         case Opt_dax_enum:
1310                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1311                 return 0;
1312 #endif
1313         /* Following mount options will be removed in September 2025 */
1314         case Opt_ikeep:
1315                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
1316                 parsing_mp->m_features |= XFS_FEAT_IKEEP;
1317                 return 0;
1318         case Opt_noikeep:
1319                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, false);
1320                 parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
1321                 return 0;
1322         case Opt_attr2:
1323                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, true);
1324                 parsing_mp->m_features |= XFS_FEAT_ATTR2;
1325                 return 0;
1326         case Opt_noattr2:
1327                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
1328                 parsing_mp->m_features |= XFS_FEAT_NOATTR2;
1329                 return 0;
1330         default:
1331                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1332                 return -EINVAL;
1333         }
1334 
1335         return 0;
1336 }
1337 
1338 static int
1339 xfs_fs_validate_params(
1340         struct xfs_mount        *mp)
1341 {
1342         /* No recovery flag requires a read-only mount */
1343         if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
1344                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1345                 return -EINVAL;
1346         }
1347 
1348         /*
1349          * We have not read the superblock at this point, so only the attr2
1350          * mount option can set the attr2 feature by this stage.
1351          */
1352         if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
1353                 xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
1354                 return -EINVAL;
1355         }
1356 
1357 
1358         if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
1359                 xfs_warn(mp,
1360         "sunit and swidth options incompatible with the noalign option");
1361                 return -EINVAL;
1362         }
1363 
1364         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1365                 xfs_warn(mp, "quota support not available in this kernel.");
1366                 return -EINVAL;
1367         }
1368 
1369         if ((mp->m_dalign && !mp->m_swidth) ||
1370             (!mp->m_dalign && mp->m_swidth)) {
1371                 xfs_warn(mp, "sunit and swidth must be specified together");
1372                 return -EINVAL;
1373         }
1374 
1375         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1376                 xfs_warn(mp,
1377         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1378                         mp->m_swidth, mp->m_dalign);
1379                 return -EINVAL;
1380         }
1381 
1382         if (mp->m_logbufs != -1 &&
1383             mp->m_logbufs != 0 &&
1384             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1385              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1386                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1387                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1388                 return -EINVAL;
1389         }
1390 
1391         if (mp->m_logbsize != -1 &&
1392             mp->m_logbsize !=  0 &&
1393             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1394              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1395              !is_power_of_2(mp->m_logbsize))) {
1396                 xfs_warn(mp,
1397                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1398                         mp->m_logbsize);
1399                 return -EINVAL;
1400         }
1401 
1402         if (xfs_has_allocsize(mp) &&
1403             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1404              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1405                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1406                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1407                 return -EINVAL;
1408         }
1409 
1410         return 0;
1411 }
1412 
1413 static int
1414 xfs_fs_fill_super(
1415         struct super_block      *sb,
1416         struct fs_context       *fc)
1417 {
1418         struct xfs_mount        *mp = sb->s_fs_info;
1419         struct inode            *root;
1420         int                     flags = 0, error;
1421 
1422         mp->m_super = sb;
1423 
1424         error = xfs_fs_validate_params(mp);
1425         if (error)
1426                 goto out_free_names;
1427 
1428         sb_min_blocksize(sb, BBSIZE);
1429         sb->s_xattr = xfs_xattr_handlers;
1430         sb->s_export_op = &xfs_export_operations;
1431 #ifdef CONFIG_XFS_QUOTA
1432         sb->s_qcop = &xfs_quotactl_operations;
1433         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1434 #endif
1435         sb->s_op = &xfs_super_operations;
1436 
1437         /*
1438          * Delay mount work if the debug hook is set. This is debug
1439          * instrumention to coordinate simulation of xfs mount failures with
1440          * VFS superblock operations
1441          */
1442         if (xfs_globals.mount_delay) {
1443                 xfs_notice(mp, "Delaying mount for %d seconds.",
1444                         xfs_globals.mount_delay);
1445                 msleep(xfs_globals.mount_delay * 1000);
1446         }
1447 
1448         if (fc->sb_flags & SB_SILENT)
1449                 flags |= XFS_MFSI_QUIET;
1450 
1451         error = xfs_open_devices(mp);
1452         if (error)
1453                 goto out_free_names;
1454 
1455         error = xfs_init_mount_workqueues(mp);
1456         if (error)
1457                 goto out_close_devices;
1458 
1459         error = xfs_init_percpu_counters(mp);
1460         if (error)
1461                 goto out_destroy_workqueues;
1462 
1463         error = xfs_inodegc_init_percpu(mp);
1464         if (error)
1465                 goto out_destroy_counters;
1466 
1467         /*
1468          * All percpu data structures requiring cleanup when a cpu goes offline
1469          * must be allocated before adding this @mp to the cpu-dead handler's
1470          * mount list.
1471          */
1472         xfs_mount_list_add(mp);
1473 
1474         /* Allocate stats memory before we do operations that might use it */
1475         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1476         if (!mp->m_stats.xs_stats) {
1477                 error = -ENOMEM;
1478                 goto out_destroy_inodegc;
1479         }
1480 
1481         error = xfs_readsb(mp, flags);
1482         if (error)
1483                 goto out_free_stats;
1484 
1485         error = xfs_finish_flags(mp);
1486         if (error)
1487                 goto out_free_sb;
1488 
1489         error = xfs_setup_devices(mp);
1490         if (error)
1491                 goto out_free_sb;
1492 
1493         /* V4 support is undergoing deprecation. */
1494         if (!xfs_has_crc(mp)) {
1495 #ifdef CONFIG_XFS_SUPPORT_V4
1496                 xfs_warn_once(mp,
1497         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1498 #else
1499                 xfs_warn(mp,
1500         "Deprecated V4 format (crc=0) not supported by kernel.");
1501                 error = -EINVAL;
1502                 goto out_free_sb;
1503 #endif
1504         }
1505 
1506         /* Filesystem claims it needs repair, so refuse the mount. */
1507         if (xfs_has_needsrepair(mp)) {
1508                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1509                 error = -EFSCORRUPTED;
1510                 goto out_free_sb;
1511         }
1512 
1513         /*
1514          * Don't touch the filesystem if a user tool thinks it owns the primary
1515          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1516          * we don't check them at all.
1517          */
1518         if (mp->m_sb.sb_inprogress) {
1519                 xfs_warn(mp, "Offline file system operation in progress!");
1520                 error = -EFSCORRUPTED;
1521                 goto out_free_sb;
1522         }
1523 
1524         /*
1525          * Until this is fixed only page-sized or smaller data blocks work.
1526          */
1527         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1528                 xfs_warn(mp,
1529                 "File system with blocksize %d bytes. "
1530                 "Only pagesize (%ld) or less will currently work.",
1531                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1532                 error = -ENOSYS;
1533                 goto out_free_sb;
1534         }
1535 
1536         /* Ensure this filesystem fits in the page cache limits */
1537         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1538             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1539                 xfs_warn(mp,
1540                 "file system too large to be mounted on this system.");
1541                 error = -EFBIG;
1542                 goto out_free_sb;
1543         }
1544 
1545         /*
1546          * XFS block mappings use 54 bits to store the logical block offset.
1547          * This should suffice to handle the maximum file size that the VFS
1548          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1549          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1550          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1551          * to check this assertion.
1552          *
1553          * Avoid integer overflow by comparing the maximum bmbt offset to the
1554          * maximum pagecache offset in units of fs blocks.
1555          */
1556         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1557                 xfs_warn(mp,
1558 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1559                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1560                          XFS_MAX_FILEOFF);
1561                 error = -EINVAL;
1562                 goto out_free_sb;
1563         }
1564 
1565         error = xfs_filestream_mount(mp);
1566         if (error)
1567                 goto out_free_sb;
1568 
1569         /*
1570          * we must configure the block size in the superblock before we run the
1571          * full mount process as the mount process can lookup and cache inodes.
1572          */
1573         sb->s_magic = XFS_SUPER_MAGIC;
1574         sb->s_blocksize = mp->m_sb.sb_blocksize;
1575         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1576         sb->s_maxbytes = MAX_LFS_FILESIZE;
1577         sb->s_max_links = XFS_MAXLINK;
1578         sb->s_time_gran = 1;
1579         if (xfs_has_bigtime(mp)) {
1580                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1581                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1582         } else {
1583                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1584                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1585         }
1586         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1587         sb->s_iflags |= SB_I_CGROUPWB;
1588 
1589         set_posix_acl_flag(sb);
1590 
1591         /* version 5 superblocks support inode version counters. */
1592         if (xfs_has_crc(mp))
1593                 sb->s_flags |= SB_I_VERSION;
1594 
1595         if (xfs_has_dax_always(mp)) {
1596                 bool rtdev_is_dax = false, datadev_is_dax;
1597 
1598                 xfs_warn(mp,
1599                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1600 
1601                 datadev_is_dax = xfs_buftarg_is_dax(sb, mp->m_ddev_targp);
1602                 if (mp->m_rtdev_targp)
1603                         rtdev_is_dax = xfs_buftarg_is_dax(sb,
1604                                                 mp->m_rtdev_targp);
1605                 if (!rtdev_is_dax && !datadev_is_dax) {
1606                         xfs_alert(mp,
1607                         "DAX unsupported by block device. Turning off DAX.");
1608                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1609                 }
1610                 if (xfs_has_reflink(mp)) {
1611                         xfs_alert(mp,
1612                 "DAX and reflink cannot be used together!");
1613                         error = -EINVAL;
1614                         goto out_filestream_unmount;
1615                 }
1616         }
1617 
1618         if (xfs_has_discard(mp)) {
1619                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1620 
1621                 if (!blk_queue_discard(q)) {
1622                         xfs_warn(mp, "mounting with \"discard\" option, but "
1623                                         "the device does not support discard");
1624                         mp->m_features &= ~XFS_FEAT_DISCARD;
1625                 }
1626         }
1627 
1628         if (xfs_has_reflink(mp)) {
1629                 if (mp->m_sb.sb_rblocks) {
1630                         xfs_alert(mp,
1631         "reflink not compatible with realtime device!");
1632                         error = -EINVAL;
1633                         goto out_filestream_unmount;
1634                 }
1635 
1636                 if (xfs_globals.always_cow) {
1637                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1638                         mp->m_always_cow = true;
1639                 }
1640         }
1641 
1642         if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
1643                 xfs_alert(mp,
1644         "reverse mapping btree not compatible with realtime device!");
1645                 error = -EINVAL;
1646                 goto out_filestream_unmount;
1647         }
1648 
1649         error = xfs_mountfs(mp);
1650         if (error)
1651                 goto out_filestream_unmount;
1652 
1653         root = igrab(VFS_I(mp->m_rootip));
1654         if (!root) {
1655                 error = -ENOENT;
1656                 goto out_unmount;
1657         }
1658         sb->s_root = d_make_root(root);
1659         if (!sb->s_root) {
1660                 error = -ENOMEM;
1661                 goto out_unmount;
1662         }
1663 
1664         return 0;
1665 
1666  out_filestream_unmount:
1667         xfs_filestream_unmount(mp);
1668  out_free_sb:
1669         xfs_freesb(mp);
1670  out_free_stats:
1671         free_percpu(mp->m_stats.xs_stats);
1672  out_destroy_inodegc:
1673         xfs_mount_list_del(mp);
1674         xfs_inodegc_free_percpu(mp);
1675  out_destroy_counters:
1676         xfs_destroy_percpu_counters(mp);
1677  out_destroy_workqueues:
1678         xfs_destroy_mount_workqueues(mp);
1679  out_close_devices:
1680         xfs_close_devices(mp);
1681  out_free_names:
1682         sb->s_fs_info = NULL;
1683         xfs_mount_free(mp);
1684         return error;
1685 
1686  out_unmount:
1687         xfs_filestream_unmount(mp);
1688         xfs_unmountfs(mp);
1689         goto out_free_sb;
1690 }
1691 
1692 static int
1693 xfs_fs_get_tree(
1694         struct fs_context       *fc)
1695 {
1696         return get_tree_bdev(fc, xfs_fs_fill_super);
1697 }
1698 
1699 static int
1700 xfs_remount_rw(
1701         struct xfs_mount        *mp)
1702 {
1703         struct xfs_sb           *sbp = &mp->m_sb;
1704         int error;
1705 
1706         if (xfs_has_norecovery(mp)) {
1707                 xfs_warn(mp,
1708                         "ro->rw transition prohibited on norecovery mount");
1709                 return -EINVAL;
1710         }
1711 
1712         if (xfs_sb_is_v5(sbp) &&
1713             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1714                 xfs_warn(mp,
1715         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1716                         (sbp->sb_features_ro_compat &
1717                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1718                 return -EINVAL;
1719         }
1720 
1721         clear_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1722 
1723         /*
1724          * If this is the first remount to writeable state we might have some
1725          * superblock changes to update.
1726          */
1727         if (mp->m_update_sb) {
1728                 error = xfs_sync_sb(mp, false);
1729                 if (error) {
1730                         xfs_warn(mp, "failed to write sb changes");
1731                         return error;
1732                 }
1733                 mp->m_update_sb = false;
1734         }
1735 
1736         /*
1737          * Fill out the reserve pool if it is empty. Use the stashed value if
1738          * it is non-zero, otherwise go with the default.
1739          */
1740         xfs_restore_resvblks(mp);
1741         xfs_log_work_queue(mp);
1742 
1743         /* Recover any CoW blocks that never got remapped. */
1744         error = xfs_reflink_recover_cow(mp);
1745         if (error) {
1746                 xfs_err(mp,
1747                         "Error %d recovering leftover CoW allocations.", error);
1748                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1749                 return error;
1750         }
1751         xfs_blockgc_start(mp);
1752 
1753         /* Create the per-AG metadata reservation pool .*/
1754         error = xfs_fs_reserve_ag_blocks(mp);
1755         if (error && error != -ENOSPC)
1756                 return error;
1757 
1758         /* Re-enable the background inode inactivation worker. */
1759         xfs_inodegc_start(mp);
1760 
1761         return 0;
1762 }
1763 
1764 static int
1765 xfs_remount_ro(
1766         struct xfs_mount        *mp)
1767 {
1768         struct xfs_icwalk       icw = {
1769                 .icw_flags      = XFS_ICWALK_FLAG_SYNC,
1770         };
1771         int                     error;
1772 
1773         /*
1774          * Cancel background eofb scanning so it cannot race with the final
1775          * log force+buftarg wait and deadlock the remount.
1776          */
1777         xfs_blockgc_stop(mp);
1778 
1779         /*
1780          * Clear out all remaining COW staging extents and speculative post-EOF
1781          * preallocations so that we don't leave inodes requiring inactivation
1782          * cleanups during reclaim on a read-only mount.  We must process every
1783          * cached inode, so this requires a synchronous cache scan.
1784          */
1785         error = xfs_blockgc_free_space(mp, &icw);
1786         if (error) {
1787                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1788                 return error;
1789         }
1790 
1791         /*
1792          * Stop the inodegc background worker.  xfs_fs_reconfigure already
1793          * flushed all pending inodegc work when it sync'd the filesystem.
1794          * The VFS holds s_umount, so we know that inodes cannot enter
1795          * xfs_fs_destroy_inode during a remount operation.  In readonly mode
1796          * we send inodes straight to reclaim, so no inodes will be queued.
1797          */
1798         xfs_inodegc_stop(mp);
1799 
1800         /* Free the per-AG metadata reservation pool. */
1801         error = xfs_fs_unreserve_ag_blocks(mp);
1802         if (error) {
1803                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1804                 return error;
1805         }
1806 
1807         /*
1808          * Before we sync the metadata, we need to free up the reserve block
1809          * pool so that the used block count in the superblock on disk is
1810          * correct at the end of the remount. Stash the current* reserve pool
1811          * size so that if we get remounted rw, we can return it to the same
1812          * size.
1813          */
1814         xfs_save_resvblks(mp);
1815 
1816         xfs_log_clean(mp);
1817         set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1818 
1819         return 0;
1820 }
1821 
1822 /*
1823  * Logically we would return an error here to prevent users from believing
1824  * they might have changed mount options using remount which can't be changed.
1825  *
1826  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1827  * arguments in some cases so we can't blindly reject options, but have to
1828  * check for each specified option if it actually differs from the currently
1829  * set option and only reject it if that's the case.
1830  *
1831  * Until that is implemented we return success for every remount request, and
1832  * silently ignore all options that we can't actually change.
1833  */
1834 static int
1835 xfs_fs_reconfigure(
1836         struct fs_context *fc)
1837 {
1838         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1839         struct xfs_mount        *new_mp = fc->s_fs_info;
1840         int                     flags = fc->sb_flags;
1841         int                     error;
1842 
1843         /* version 5 superblocks always support version counters. */
1844         if (xfs_has_crc(mp))
1845                 fc->sb_flags |= SB_I_VERSION;
1846 
1847         error = xfs_fs_validate_params(new_mp);
1848         if (error)
1849                 return error;
1850 
1851         sync_filesystem(mp->m_super);
1852 
1853         /* inode32 -> inode64 */
1854         if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
1855                 mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1856                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1857         }
1858 
1859         /* inode64 -> inode32 */
1860         if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) {
1861                 mp->m_features |= XFS_FEAT_SMALL_INUMS;
1862                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1863         }
1864 
1865         /* ro -> rw */
1866         if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
1867                 error = xfs_remount_rw(mp);
1868                 if (error)
1869                         return error;
1870         }
1871 
1872         /* rw -> ro */
1873         if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
1874                 error = xfs_remount_ro(mp);
1875                 if (error)
1876                         return error;
1877         }
1878 
1879         return 0;
1880 }
1881 
1882 static void xfs_fs_free(
1883         struct fs_context       *fc)
1884 {
1885         struct xfs_mount        *mp = fc->s_fs_info;
1886 
1887         /*
1888          * mp is stored in the fs_context when it is initialized.
1889          * mp is transferred to the superblock on a successful mount,
1890          * but if an error occurs before the transfer we have to free
1891          * it here.
1892          */
1893         if (mp)
1894                 xfs_mount_free(mp);
1895 }
1896 
1897 static const struct fs_context_operations xfs_context_ops = {
1898         .parse_param = xfs_fs_parse_param,
1899         .get_tree    = xfs_fs_get_tree,
1900         .reconfigure = xfs_fs_reconfigure,
1901         .free        = xfs_fs_free,
1902 };
1903 
1904 static int xfs_init_fs_context(
1905         struct fs_context       *fc)
1906 {
1907         struct xfs_mount        *mp;
1908 
1909         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1910         if (!mp)
1911                 return -ENOMEM;
1912 
1913         spin_lock_init(&mp->m_sb_lock);
1914         spin_lock_init(&mp->m_agirotor_lock);
1915         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1916         spin_lock_init(&mp->m_perag_lock);
1917         mutex_init(&mp->m_growlock);
1918         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1919         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1920         mp->m_kobj.kobject.kset = xfs_kset;
1921         /*
1922          * We don't create the finobt per-ag space reservation until after log
1923          * recovery, so we must set this to true so that an ifree transaction
1924          * started during log recovery will not depend on space reservations
1925          * for finobt expansion.
1926          */
1927         mp->m_finobt_nores = true;
1928 
1929         /*
1930          * These can be overridden by the mount option parsing.
1931          */
1932         mp->m_logbufs = -1;
1933         mp->m_logbsize = -1;
1934         mp->m_allocsize_log = 16; /* 64k */
1935 
1936         /*
1937          * Copy binary VFS mount flags we are interested in.
1938          */
1939         if (fc->sb_flags & SB_RDONLY)
1940                 set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
1941         if (fc->sb_flags & SB_DIRSYNC)
1942                 mp->m_features |= XFS_FEAT_DIRSYNC;
1943         if (fc->sb_flags & SB_SYNCHRONOUS)
1944                 mp->m_features |= XFS_FEAT_WSYNC;
1945 
1946         fc->s_fs_info = mp;
1947         fc->ops = &xfs_context_ops;
1948 
1949         return 0;
1950 }
1951 
1952 static struct file_system_type xfs_fs_type = {
1953         .owner                  = THIS_MODULE,
1954         .name                   = "xfs",
1955         .init_fs_context        = xfs_init_fs_context,
1956         .parameters             = xfs_fs_parameters,
1957         .kill_sb                = kill_block_super,
1958         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1959 };
1960 MODULE_ALIAS_FS("xfs");
1961 
1962 STATIC int __init
1963 xfs_init_caches(void)
1964 {
1965         int             error;
1966 
1967         xfs_log_ticket_cache = kmem_cache_create("xfs_log_ticket",
1968                                                 sizeof(struct xlog_ticket),
1969                                                 0, 0, NULL);
1970         if (!xfs_log_ticket_cache)
1971                 goto out;
1972 
1973         error = xfs_btree_init_cur_caches();
1974         if (error)
1975                 goto out_destroy_log_ticket_cache;
1976 
1977         error = xfs_defer_init_item_caches();
1978         if (error)
1979                 goto out_destroy_btree_cur_cache;
1980 
1981         xfs_da_state_cache = kmem_cache_create("xfs_da_state",
1982                                               sizeof(struct xfs_da_state),
1983                                               0, 0, NULL);
1984         if (!xfs_da_state_cache)
1985                 goto out_destroy_defer_item_cache;
1986 
1987         xfs_ifork_cache = kmem_cache_create("xfs_ifork",
1988                                            sizeof(struct xfs_ifork),
1989                                            0, 0, NULL);
1990         if (!xfs_ifork_cache)
1991                 goto out_destroy_da_state_cache;
1992 
1993         xfs_trans_cache = kmem_cache_create("xfs_trans",
1994                                            sizeof(struct xfs_trans),
1995                                            0, 0, NULL);
1996         if (!xfs_trans_cache)
1997                 goto out_destroy_ifork_cache;
1998 
1999 
2000         /*
2001          * The size of the cache-allocated buf log item is the maximum
2002          * size possible under XFS.  This wastes a little bit of memory,
2003          * but it is much faster.
2004          */
2005         xfs_buf_item_cache = kmem_cache_create("xfs_buf_item",
2006                                               sizeof(struct xfs_buf_log_item),
2007                                               0, 0, NULL);
2008         if (!xfs_buf_item_cache)
2009                 goto out_destroy_trans_cache;
2010 
2011         xfs_efd_cache = kmem_cache_create("xfs_efd_item",
2012                                         (sizeof(struct xfs_efd_log_item) +
2013                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
2014                                         sizeof(struct xfs_extent)),
2015                                         0, 0, NULL);
2016         if (!xfs_efd_cache)
2017                 goto out_destroy_buf_item_cache;
2018 
2019         xfs_efi_cache = kmem_cache_create("xfs_efi_item",
2020                                          (sizeof(struct xfs_efi_log_item) +
2021                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
2022                                          sizeof(struct xfs_extent)),
2023                                          0, 0, NULL);
2024         if (!xfs_efi_cache)
2025                 goto out_destroy_efd_cache;
2026 
2027         xfs_inode_cache = kmem_cache_create("xfs_inode",
2028                                            sizeof(struct xfs_inode), 0,
2029                                            (SLAB_HWCACHE_ALIGN |
2030                                             SLAB_RECLAIM_ACCOUNT |
2031                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
2032                                            xfs_fs_inode_init_once);
2033         if (!xfs_inode_cache)
2034                 goto out_destroy_efi_cache;
2035 
2036         xfs_ili_cache = kmem_cache_create("xfs_ili",
2037                                          sizeof(struct xfs_inode_log_item), 0,
2038                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
2039                                          NULL);
2040         if (!xfs_ili_cache)
2041                 goto out_destroy_inode_cache;
2042 
2043         xfs_icreate_cache = kmem_cache_create("xfs_icr",
2044                                              sizeof(struct xfs_icreate_item),
2045                                              0, 0, NULL);
2046         if (!xfs_icreate_cache)
2047                 goto out_destroy_ili_cache;
2048 
2049         xfs_rud_cache = kmem_cache_create("xfs_rud_item",
2050                                          sizeof(struct xfs_rud_log_item),
2051                                          0, 0, NULL);
2052         if (!xfs_rud_cache)
2053                 goto out_destroy_icreate_cache;
2054 
2055         xfs_rui_cache = kmem_cache_create("xfs_rui_item",
2056                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2057                         0, 0, NULL);
2058         if (!xfs_rui_cache)
2059                 goto out_destroy_rud_cache;
2060 
2061         xfs_cud_cache = kmem_cache_create("xfs_cud_item",
2062                                          sizeof(struct xfs_cud_log_item),
2063                                          0, 0, NULL);
2064         if (!xfs_cud_cache)
2065                 goto out_destroy_rui_cache;
2066 
2067         xfs_cui_cache = kmem_cache_create("xfs_cui_item",
2068                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2069                         0, 0, NULL);
2070         if (!xfs_cui_cache)
2071                 goto out_destroy_cud_cache;
2072 
2073         xfs_bud_cache = kmem_cache_create("xfs_bud_item",
2074                                          sizeof(struct xfs_bud_log_item),
2075                                          0, 0, NULL);
2076         if (!xfs_bud_cache)
2077                 goto out_destroy_cui_cache;
2078 
2079         xfs_bui_cache = kmem_cache_create("xfs_bui_item",
2080                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2081                         0, 0, NULL);
2082         if (!xfs_bui_cache)
2083                 goto out_destroy_bud_cache;
2084 
2085         return 0;
2086 
2087  out_destroy_bud_cache:
2088         kmem_cache_destroy(xfs_bud_cache);
2089  out_destroy_cui_cache:
2090         kmem_cache_destroy(xfs_cui_cache);
2091  out_destroy_cud_cache:
2092         kmem_cache_destroy(xfs_cud_cache);
2093  out_destroy_rui_cache:
2094         kmem_cache_destroy(xfs_rui_cache);
2095  out_destroy_rud_cache:
2096         kmem_cache_destroy(xfs_rud_cache);
2097  out_destroy_icreate_cache:
2098         kmem_cache_destroy(xfs_icreate_cache);
2099  out_destroy_ili_cache:
2100         kmem_cache_destroy(xfs_ili_cache);
2101  out_destroy_inode_cache:
2102         kmem_cache_destroy(xfs_inode_cache);
2103  out_destroy_efi_cache:
2104         kmem_cache_destroy(xfs_efi_cache);
2105  out_destroy_efd_cache:
2106         kmem_cache_destroy(xfs_efd_cache);
2107  out_destroy_buf_item_cache:
2108         kmem_cache_destroy(xfs_buf_item_cache);
2109  out_destroy_trans_cache:
2110         kmem_cache_destroy(xfs_trans_cache);
2111  out_destroy_ifork_cache:
2112         kmem_cache_destroy(xfs_ifork_cache);
2113  out_destroy_da_state_cache:
2114         kmem_cache_destroy(xfs_da_state_cache);
2115  out_destroy_defer_item_cache:
2116         xfs_defer_destroy_item_caches();
2117  out_destroy_btree_cur_cache:
2118         xfs_btree_destroy_cur_caches();
2119  out_destroy_log_ticket_cache:
2120         kmem_cache_destroy(xfs_log_ticket_cache);
2121  out:
2122         return -ENOMEM;
2123 }
2124 
2125 STATIC void
2126 xfs_destroy_caches(void)
2127 {
2128         /*
2129          * Make sure all delayed rcu free are flushed before we
2130          * destroy caches.
2131          */
2132         rcu_barrier();
2133         kmem_cache_destroy(xfs_bui_cache);
2134         kmem_cache_destroy(xfs_bud_cache);
2135         kmem_cache_destroy(xfs_cui_cache);
2136         kmem_cache_destroy(xfs_cud_cache);
2137         kmem_cache_destroy(xfs_rui_cache);
2138         kmem_cache_destroy(xfs_rud_cache);
2139         kmem_cache_destroy(xfs_icreate_cache);
2140         kmem_cache_destroy(xfs_ili_cache);
2141         kmem_cache_destroy(xfs_inode_cache);
2142         kmem_cache_destroy(xfs_efi_cache);
2143         kmem_cache_destroy(xfs_efd_cache);
2144         kmem_cache_destroy(xfs_buf_item_cache);
2145         kmem_cache_destroy(xfs_trans_cache);
2146         kmem_cache_destroy(xfs_ifork_cache);
2147         kmem_cache_destroy(xfs_da_state_cache);
2148         xfs_defer_destroy_item_caches();
2149         xfs_btree_destroy_cur_caches();
2150         kmem_cache_destroy(xfs_log_ticket_cache);
2151 }
2152 
2153 STATIC int __init
2154 xfs_init_workqueues(void)
2155 {
2156         /*
2157          * The allocation workqueue can be used in memory reclaim situations
2158          * (writepage path), and parallelism is only limited by the number of
2159          * AGs in all the filesystems mounted. Hence use the default large
2160          * max_active value for this workqueue.
2161          */
2162         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2163                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2164         if (!xfs_alloc_wq)
2165                 return -ENOMEM;
2166 
2167         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2168                         0);
2169         if (!xfs_discard_wq)
2170                 goto out_free_alloc_wq;
2171 
2172         return 0;
2173 out_free_alloc_wq:
2174         destroy_workqueue(xfs_alloc_wq);
2175         return -ENOMEM;
2176 }
2177 
2178 STATIC void
2179 xfs_destroy_workqueues(void)
2180 {
2181         destroy_workqueue(xfs_discard_wq);
2182         destroy_workqueue(xfs_alloc_wq);
2183 }
2184 
2185 #ifdef CONFIG_HOTPLUG_CPU
2186 static int
2187 xfs_cpu_dead(
2188         unsigned int            cpu)
2189 {
2190         struct xfs_mount        *mp, *n;
2191 
2192         spin_lock(&xfs_mount_list_lock);
2193         list_for_each_entry_safe(mp, n, &xfs_mount_list, m_mount_list) {
2194                 spin_unlock(&xfs_mount_list_lock);
2195                 xfs_inodegc_cpu_dead(mp, cpu);
2196                 spin_lock(&xfs_mount_list_lock);
2197         }
2198         spin_unlock(&xfs_mount_list_lock);
2199         return 0;
2200 }
2201 
2202 static int __init
2203 xfs_cpu_hotplug_init(void)
2204 {
2205         int     error;
2206 
2207         error = cpuhp_setup_state_nocalls(CPUHP_XFS_DEAD, "xfs:dead", NULL,
2208                         xfs_cpu_dead);
2209         if (error < 0)
2210                 xfs_alert(NULL,
2211 "Failed to initialise CPU hotplug, error %d. XFS is non-functional.",
2212                         error);
2213         return error;
2214 }
2215 
2216 static void
2217 xfs_cpu_hotplug_destroy(void)
2218 {
2219         cpuhp_remove_state_nocalls(CPUHP_XFS_DEAD);
2220 }
2221 
2222 #else /* !CONFIG_HOTPLUG_CPU */
2223 static inline int xfs_cpu_hotplug_init(void) { return 0; }
2224 static inline void xfs_cpu_hotplug_destroy(void) {}
2225 #endif
2226 
2227 STATIC int __init
2228 init_xfs_fs(void)
2229 {
2230         int                     error;
2231 
2232         xfs_check_ondisk_structs();
2233 
2234         printk(KERN_INFO XFS_VERSION_STRING " with "
2235                          XFS_BUILD_OPTIONS " enabled\n");
2236 
2237         xfs_dir_startup();
2238 
2239         error = xfs_cpu_hotplug_init();
2240         if (error)
2241                 goto out;
2242 
2243         error = xfs_init_caches();
2244         if (error)
2245                 goto out_destroy_hp;
2246 
2247         error = xfs_init_workqueues();
2248         if (error)
2249                 goto out_destroy_caches;
2250 
2251         error = xfs_mru_cache_init();
2252         if (error)
2253                 goto out_destroy_wq;
2254 
2255         error = xfs_buf_init();
2256         if (error)
2257                 goto out_mru_cache_uninit;
2258 
2259         error = xfs_init_procfs();
2260         if (error)
2261                 goto out_buf_terminate;
2262 
2263         error = xfs_sysctl_register();
2264         if (error)
2265                 goto out_cleanup_procfs;
2266 
2267         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2268         if (!xfs_kset) {
2269                 error = -ENOMEM;
2270                 goto out_sysctl_unregister;
2271         }
2272 
2273         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2274 
2275         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2276         if (!xfsstats.xs_stats) {
2277                 error = -ENOMEM;
2278                 goto out_kset_unregister;
2279         }
2280 
2281         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2282                                "stats");
2283         if (error)
2284                 goto out_free_stats;
2285 
2286 #ifdef DEBUG
2287         xfs_dbg_kobj.kobject.kset = xfs_kset;
2288         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2289         if (error)
2290                 goto out_remove_stats_kobj;
2291 #endif
2292 
2293         error = xfs_qm_init();
2294         if (error)
2295                 goto out_remove_dbg_kobj;
2296 
2297         error = register_filesystem(&xfs_fs_type);
2298         if (error)
2299                 goto out_qm_exit;
2300         return 0;
2301 
2302  out_qm_exit:
2303         xfs_qm_exit();
2304  out_remove_dbg_kobj:
2305 #ifdef DEBUG
2306         xfs_sysfs_del(&xfs_dbg_kobj);
2307  out_remove_stats_kobj:
2308 #endif
2309         xfs_sysfs_del(&xfsstats.xs_kobj);
2310  out_free_stats:
2311         free_percpu(xfsstats.xs_stats);
2312  out_kset_unregister:
2313         kset_unregister(xfs_kset);
2314  out_sysctl_unregister:
2315         xfs_sysctl_unregister();
2316  out_cleanup_procfs:
2317         xfs_cleanup_procfs();
2318  out_buf_terminate:
2319         xfs_buf_terminate();
2320  out_mru_cache_uninit:
2321         xfs_mru_cache_uninit();
2322  out_destroy_wq:
2323         xfs_destroy_workqueues();
2324  out_destroy_caches:
2325         xfs_destroy_caches();
2326  out_destroy_hp:
2327         xfs_cpu_hotplug_destroy();
2328  out:
2329         return error;
2330 }
2331 
2332 STATIC void __exit
2333 exit_xfs_fs(void)
2334 {
2335         xfs_qm_exit();
2336         unregister_filesystem(&xfs_fs_type);
2337 #ifdef DEBUG
2338         xfs_sysfs_del(&xfs_dbg_kobj);
2339 #endif
2340         xfs_sysfs_del(&xfsstats.xs_kobj);
2341         free_percpu(xfsstats.xs_stats);
2342         kset_unregister(xfs_kset);
2343         xfs_sysctl_unregister();
2344         xfs_cleanup_procfs();
2345         xfs_buf_terminate();
2346         xfs_mru_cache_uninit();
2347         xfs_destroy_workqueues();
2348         xfs_destroy_caches();
2349         xfs_uuid_table_free();
2350         xfs_cpu_hotplug_destroy();
2351 }
2352 
2353 module_init(init_xfs_fs);
2354 module_exit(exit_xfs_fs);
2355 
2356 MODULE_AUTHOR("Silicon Graphics, Inc.");
2357 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2358 MODULE_LICENSE("GPL");
2359 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp