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

Version: ~ [ linux-6.0-rc6 ] ~ [ linux-5.19.10 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.69 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.144 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.214 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.259 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.294 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.329 ] ~ [ 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 ] ~
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  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 
 41 #include <linux/magic.h>
 42 #include <linux/fs_context.h>
 43 #include <linux/fs_parser.h>
 44 
 45 static const struct super_operations xfs_super_operations;
 46 
 47 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
 48 #ifdef DEBUG
 49 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
 50 #endif
 51 
 52 enum xfs_dax_mode {
 53         XFS_DAX_INODE = 0,
 54         XFS_DAX_ALWAYS = 1,
 55         XFS_DAX_NEVER = 2,
 56 };
 57 
 58 static void
 59 xfs_mount_set_dax_mode(
 60         struct xfs_mount        *mp,
 61         enum xfs_dax_mode       mode)
 62 {
 63         switch (mode) {
 64         case XFS_DAX_INODE:
 65                 mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER);
 66                 break;
 67         case XFS_DAX_ALWAYS:
 68                 mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
 69                 mp->m_flags &= ~XFS_MOUNT_DAX_NEVER;
 70                 break;
 71         case XFS_DAX_NEVER:
 72                 mp->m_flags |= XFS_MOUNT_DAX_NEVER;
 73                 mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
 74                 break;
 75         }
 76 }
 77 
 78 static const struct constant_table dax_param_enums[] = {
 79         {"inode",       XFS_DAX_INODE },
 80         {"always",      XFS_DAX_ALWAYS },
 81         {"never",       XFS_DAX_NEVER },
 82         {}
 83 };
 84 
 85 /*
 86  * Table driven mount option parser.
 87  */
 88 enum {
 89         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
 90         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
 91         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
 92         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
 93         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
 94         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
 95         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
 96         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
 97         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
 98 };
 99 
100 static const struct fs_parameter_spec xfs_fs_parameters[] = {
101         fsparam_u32("logbufs",          Opt_logbufs),
102         fsparam_string("logbsize",      Opt_logbsize),
103         fsparam_string("logdev",        Opt_logdev),
104         fsparam_string("rtdev",         Opt_rtdev),
105         fsparam_flag("wsync",           Opt_wsync),
106         fsparam_flag("noalign",         Opt_noalign),
107         fsparam_flag("swalloc",         Opt_swalloc),
108         fsparam_u32("sunit",            Opt_sunit),
109         fsparam_u32("swidth",           Opt_swidth),
110         fsparam_flag("nouuid",          Opt_nouuid),
111         fsparam_flag("grpid",           Opt_grpid),
112         fsparam_flag("nogrpid",         Opt_nogrpid),
113         fsparam_flag("bsdgroups",       Opt_bsdgroups),
114         fsparam_flag("sysvgroups",      Opt_sysvgroups),
115         fsparam_string("allocsize",     Opt_allocsize),
116         fsparam_flag("norecovery",      Opt_norecovery),
117         fsparam_flag("inode64",         Opt_inode64),
118         fsparam_flag("inode32",         Opt_inode32),
119         fsparam_flag("ikeep",           Opt_ikeep),
120         fsparam_flag("noikeep",         Opt_noikeep),
121         fsparam_flag("largeio",         Opt_largeio),
122         fsparam_flag("nolargeio",       Opt_nolargeio),
123         fsparam_flag("attr2",           Opt_attr2),
124         fsparam_flag("noattr2",         Opt_noattr2),
125         fsparam_flag("filestreams",     Opt_filestreams),
126         fsparam_flag("quota",           Opt_quota),
127         fsparam_flag("noquota",         Opt_noquota),
128         fsparam_flag("usrquota",        Opt_usrquota),
129         fsparam_flag("grpquota",        Opt_grpquota),
130         fsparam_flag("prjquota",        Opt_prjquota),
131         fsparam_flag("uquota",          Opt_uquota),
132         fsparam_flag("gquota",          Opt_gquota),
133         fsparam_flag("pquota",          Opt_pquota),
134         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
135         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
136         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
137         fsparam_flag("qnoenforce",      Opt_qnoenforce),
138         fsparam_flag("discard",         Opt_discard),
139         fsparam_flag("nodiscard",       Opt_nodiscard),
140         fsparam_flag("dax",             Opt_dax),
141         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
142         {}
143 };
144 
145 struct proc_xfs_info {
146         uint64_t        flag;
147         char            *str;
148 };
149 
150 static int
151 xfs_fs_show_options(
152         struct seq_file         *m,
153         struct dentry           *root)
154 {
155         static struct proc_xfs_info xfs_info_set[] = {
156                 /* the few simple ones we can get from the mount struct */
157                 { XFS_MOUNT_IKEEP,              ",ikeep" },
158                 { XFS_MOUNT_WSYNC,              ",wsync" },
159                 { XFS_MOUNT_NOALIGN,            ",noalign" },
160                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
161                 { XFS_MOUNT_NOUUID,             ",nouuid" },
162                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
163                 { XFS_MOUNT_ATTR2,              ",attr2" },
164                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
165                 { XFS_MOUNT_GRPID,              ",grpid" },
166                 { XFS_MOUNT_DISCARD,            ",discard" },
167                 { XFS_MOUNT_LARGEIO,            ",largeio" },
168                 { XFS_MOUNT_DAX_ALWAYS,         ",dax=always" },
169                 { XFS_MOUNT_DAX_NEVER,          ",dax=never" },
170                 { 0, NULL }
171         };
172         struct xfs_mount        *mp = XFS_M(root->d_sb);
173         struct proc_xfs_info    *xfs_infop;
174 
175         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
176                 if (mp->m_flags & xfs_infop->flag)
177                         seq_puts(m, xfs_infop->str);
178         }
179 
180         seq_printf(m, ",inode%d",
181                 (mp->m_flags & XFS_MOUNT_SMALL_INUMS) ? 32 : 64);
182 
183         if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
184                 seq_printf(m, ",allocsize=%dk",
185                            (1 << mp->m_allocsize_log) >> 10);
186 
187         if (mp->m_logbufs > 0)
188                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
189         if (mp->m_logbsize > 0)
190                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
191 
192         if (mp->m_logname)
193                 seq_show_option(m, "logdev", mp->m_logname);
194         if (mp->m_rtname)
195                 seq_show_option(m, "rtdev", mp->m_rtname);
196 
197         if (mp->m_dalign > 0)
198                 seq_printf(m, ",sunit=%d",
199                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
200         if (mp->m_swidth > 0)
201                 seq_printf(m, ",swidth=%d",
202                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
203 
204         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
205                 if (mp->m_qflags & XFS_UQUOTA_ENFD)
206                         seq_puts(m, ",usrquota");
207                 else
208                         seq_puts(m, ",uqnoenforce");
209         }
210 
211         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
212                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
213                         seq_puts(m, ",prjquota");
214                 else
215                         seq_puts(m, ",pqnoenforce");
216         }
217         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
218                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
219                         seq_puts(m, ",grpquota");
220                 else
221                         seq_puts(m, ",gqnoenforce");
222         }
223 
224         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
225                 seq_puts(m, ",noquota");
226 
227         return 0;
228 }
229 
230 /*
231  * Set parameters for inode allocation heuristics, taking into account
232  * filesystem size and inode32/inode64 mount options; i.e. specifically
233  * whether or not XFS_MOUNT_SMALL_INUMS is set.
234  *
235  * Inode allocation patterns are altered only if inode32 is requested
236  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
237  * If altered, XFS_MOUNT_32BITINODES is set as well.
238  *
239  * An agcount independent of that in the mount structure is provided
240  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
241  * to the potentially higher ag count.
242  *
243  * Returns the maximum AG index which may contain inodes.
244  */
245 xfs_agnumber_t
246 xfs_set_inode_alloc(
247         struct xfs_mount *mp,
248         xfs_agnumber_t  agcount)
249 {
250         xfs_agnumber_t  index;
251         xfs_agnumber_t  maxagi = 0;
252         xfs_sb_t        *sbp = &mp->m_sb;
253         xfs_agnumber_t  max_metadata;
254         xfs_agino_t     agino;
255         xfs_ino_t       ino;
256 
257         /*
258          * Calculate how much should be reserved for inodes to meet
259          * the max inode percentage.  Used only for inode32.
260          */
261         if (M_IGEO(mp)->maxicount) {
262                 uint64_t        icount;
263 
264                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
265                 do_div(icount, 100);
266                 icount += sbp->sb_agblocks - 1;
267                 do_div(icount, sbp->sb_agblocks);
268                 max_metadata = icount;
269         } else {
270                 max_metadata = agcount;
271         }
272 
273         /* Get the last possible inode in the filesystem */
274         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
275         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
276 
277         /*
278          * If user asked for no more than 32-bit inodes, and the fs is
279          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
280          * the allocator to accommodate the request.
281          */
282         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
283                 mp->m_flags |= XFS_MOUNT_32BITINODES;
284         else
285                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
286 
287         for (index = 0; index < agcount; index++) {
288                 struct xfs_perag        *pag;
289 
290                 ino = XFS_AGINO_TO_INO(mp, index, agino);
291 
292                 pag = xfs_perag_get(mp, index);
293 
294                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
295                         if (ino > XFS_MAXINUMBER_32) {
296                                 pag->pagi_inodeok = 0;
297                                 pag->pagf_metadata = 0;
298                         } else {
299                                 pag->pagi_inodeok = 1;
300                                 maxagi++;
301                                 if (index < max_metadata)
302                                         pag->pagf_metadata = 1;
303                                 else
304                                         pag->pagf_metadata = 0;
305                         }
306                 } else {
307                         pag->pagi_inodeok = 1;
308                         pag->pagf_metadata = 0;
309                 }
310 
311                 xfs_perag_put(pag);
312         }
313 
314         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
315 }
316 
317 STATIC int
318 xfs_blkdev_get(
319         xfs_mount_t             *mp,
320         const char              *name,
321         struct block_device     **bdevp)
322 {
323         int                     error = 0;
324 
325         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
326                                     mp);
327         if (IS_ERR(*bdevp)) {
328                 error = PTR_ERR(*bdevp);
329                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
330         }
331 
332         return error;
333 }
334 
335 STATIC void
336 xfs_blkdev_put(
337         struct block_device     *bdev)
338 {
339         if (bdev)
340                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
341 }
342 
343 STATIC void
344 xfs_close_devices(
345         struct xfs_mount        *mp)
346 {
347         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
348 
349         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
350                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
351                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
352 
353                 xfs_free_buftarg(mp->m_logdev_targp);
354                 xfs_blkdev_put(logdev);
355                 fs_put_dax(dax_logdev);
356         }
357         if (mp->m_rtdev_targp) {
358                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
359                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
360 
361                 xfs_free_buftarg(mp->m_rtdev_targp);
362                 xfs_blkdev_put(rtdev);
363                 fs_put_dax(dax_rtdev);
364         }
365         xfs_free_buftarg(mp->m_ddev_targp);
366         fs_put_dax(dax_ddev);
367 }
368 
369 /*
370  * The file system configurations are:
371  *      (1) device (partition) with data and internal log
372  *      (2) logical volume with data and log subvolumes.
373  *      (3) logical volume with data, log, and realtime subvolumes.
374  *
375  * We only have to handle opening the log and realtime volumes here if
376  * they are present.  The data subvolume has already been opened by
377  * get_sb_bdev() and is stored in sb->s_bdev.
378  */
379 STATIC int
380 xfs_open_devices(
381         struct xfs_mount        *mp)
382 {
383         struct block_device     *ddev = mp->m_super->s_bdev;
384         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
385         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
386         struct block_device     *logdev = NULL, *rtdev = NULL;
387         int                     error;
388 
389         /*
390          * Open real time and log devices - order is important.
391          */
392         if (mp->m_logname) {
393                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
394                 if (error)
395                         goto out;
396                 dax_logdev = fs_dax_get_by_bdev(logdev);
397         }
398 
399         if (mp->m_rtname) {
400                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
401                 if (error)
402                         goto out_close_logdev;
403 
404                 if (rtdev == ddev || rtdev == logdev) {
405                         xfs_warn(mp,
406         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
407                         error = -EINVAL;
408                         goto out_close_rtdev;
409                 }
410                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
411         }
412 
413         /*
414          * Setup xfs_mount buffer target pointers
415          */
416         error = -ENOMEM;
417         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
418         if (!mp->m_ddev_targp)
419                 goto out_close_rtdev;
420 
421         if (rtdev) {
422                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
423                 if (!mp->m_rtdev_targp)
424                         goto out_free_ddev_targ;
425         }
426 
427         if (logdev && logdev != ddev) {
428                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
429                 if (!mp->m_logdev_targp)
430                         goto out_free_rtdev_targ;
431         } else {
432                 mp->m_logdev_targp = mp->m_ddev_targp;
433         }
434 
435         return 0;
436 
437  out_free_rtdev_targ:
438         if (mp->m_rtdev_targp)
439                 xfs_free_buftarg(mp->m_rtdev_targp);
440  out_free_ddev_targ:
441         xfs_free_buftarg(mp->m_ddev_targp);
442  out_close_rtdev:
443         xfs_blkdev_put(rtdev);
444         fs_put_dax(dax_rtdev);
445  out_close_logdev:
446         if (logdev && logdev != ddev) {
447                 xfs_blkdev_put(logdev);
448                 fs_put_dax(dax_logdev);
449         }
450  out:
451         fs_put_dax(dax_ddev);
452         return error;
453 }
454 
455 /*
456  * Setup xfs_mount buffer target pointers based on superblock
457  */
458 STATIC int
459 xfs_setup_devices(
460         struct xfs_mount        *mp)
461 {
462         int                     error;
463 
464         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
465         if (error)
466                 return error;
467 
468         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
469                 unsigned int    log_sector_size = BBSIZE;
470 
471                 if (xfs_sb_version_hassector(&mp->m_sb))
472                         log_sector_size = mp->m_sb.sb_logsectsize;
473                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
474                                             log_sector_size);
475                 if (error)
476                         return error;
477         }
478         if (mp->m_rtdev_targp) {
479                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
480                                             mp->m_sb.sb_sectsize);
481                 if (error)
482                         return error;
483         }
484 
485         return 0;
486 }
487 
488 STATIC int
489 xfs_init_mount_workqueues(
490         struct xfs_mount        *mp)
491 {
492         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
493                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
494                         1, mp->m_super->s_id);
495         if (!mp->m_buf_workqueue)
496                 goto out;
497 
498         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
499                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
500                         0, mp->m_super->s_id);
501         if (!mp->m_unwritten_workqueue)
502                 goto out_destroy_buf;
503 
504         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
505                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_UNBOUND),
506                         0, mp->m_super->s_id);
507         if (!mp->m_cil_workqueue)
508                 goto out_destroy_unwritten;
509 
510         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
511                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
512                         0, mp->m_super->s_id);
513         if (!mp->m_reclaim_workqueue)
514                 goto out_destroy_cil;
515 
516         mp->m_gc_workqueue = alloc_workqueue("xfs-gc/%s",
517                         WQ_SYSFS | WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM,
518                         0, mp->m_super->s_id);
519         if (!mp->m_gc_workqueue)
520                 goto out_destroy_reclaim;
521 
522         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
523                         XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
524         if (!mp->m_sync_workqueue)
525                 goto out_destroy_eofb;
526 
527         return 0;
528 
529 out_destroy_eofb:
530         destroy_workqueue(mp->m_gc_workqueue);
531 out_destroy_reclaim:
532         destroy_workqueue(mp->m_reclaim_workqueue);
533 out_destroy_cil:
534         destroy_workqueue(mp->m_cil_workqueue);
535 out_destroy_unwritten:
536         destroy_workqueue(mp->m_unwritten_workqueue);
537 out_destroy_buf:
538         destroy_workqueue(mp->m_buf_workqueue);
539 out:
540         return -ENOMEM;
541 }
542 
543 STATIC void
544 xfs_destroy_mount_workqueues(
545         struct xfs_mount        *mp)
546 {
547         destroy_workqueue(mp->m_sync_workqueue);
548         destroy_workqueue(mp->m_gc_workqueue);
549         destroy_workqueue(mp->m_reclaim_workqueue);
550         destroy_workqueue(mp->m_cil_workqueue);
551         destroy_workqueue(mp->m_unwritten_workqueue);
552         destroy_workqueue(mp->m_buf_workqueue);
553 }
554 
555 static void
556 xfs_flush_inodes_worker(
557         struct work_struct      *work)
558 {
559         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
560                                                    m_flush_inodes_work);
561         struct super_block      *sb = mp->m_super;
562 
563         if (down_read_trylock(&sb->s_umount)) {
564                 sync_inodes_sb(sb);
565                 up_read(&sb->s_umount);
566         }
567 }
568 
569 /*
570  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
571  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
572  * for IO to complete so that we effectively throttle multiple callers to the
573  * rate at which IO is completing.
574  */
575 void
576 xfs_flush_inodes(
577         struct xfs_mount        *mp)
578 {
579         /*
580          * If flush_work() returns true then that means we waited for a flush
581          * which was already in progress.  Don't bother running another scan.
582          */
583         if (flush_work(&mp->m_flush_inodes_work))
584                 return;
585 
586         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
587         flush_work(&mp->m_flush_inodes_work);
588 }
589 
590 /* Catch misguided souls that try to use this interface on XFS */
591 STATIC struct inode *
592 xfs_fs_alloc_inode(
593         struct super_block      *sb)
594 {
595         BUG();
596         return NULL;
597 }
598 
599 #ifdef DEBUG
600 static void
601 xfs_check_delalloc(
602         struct xfs_inode        *ip,
603         int                     whichfork)
604 {
605         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
606         struct xfs_bmbt_irec    got;
607         struct xfs_iext_cursor  icur;
608 
609         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
610                 return;
611         do {
612                 if (isnullstartblock(got.br_startblock)) {
613                         xfs_warn(ip->i_mount,
614         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
615                                 ip->i_ino,
616                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
617                                 got.br_startoff, got.br_blockcount);
618                 }
619         } while (xfs_iext_next_extent(ifp, &icur, &got));
620 }
621 #else
622 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
623 #endif
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 
641         xfs_inactive(ip);
642 
643         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
644                 xfs_check_delalloc(ip, XFS_DATA_FORK);
645                 xfs_check_delalloc(ip, XFS_COW_FORK);
646                 ASSERT(0);
647         }
648 
649         XFS_STATS_INC(ip->i_mount, vn_reclaim);
650 
651         /*
652          * We should never get here with one of the reclaim flags already set.
653          */
654         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
655         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
656 
657         /*
658          * We always use background reclaim here because even if the inode is
659          * clean, it still may be under IO and hence we have wait for IO
660          * completion to occur before we can reclaim the inode. The background
661          * reclaim path handles this more efficiently than we can here, so
662          * simply let background reclaim tear down all inodes.
663          */
664         xfs_inode_mark_reclaimable(ip);
665 }
666 
667 static void
668 xfs_fs_dirty_inode(
669         struct inode                    *inode,
670         int                             flag)
671 {
672         struct xfs_inode                *ip = XFS_I(inode);
673         struct xfs_mount                *mp = ip->i_mount;
674         struct xfs_trans                *tp;
675 
676         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
677                 return;
678         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
679                 return;
680 
681         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
682                 return;
683         xfs_ilock(ip, XFS_ILOCK_EXCL);
684         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
685         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
686         xfs_trans_commit(tp);
687 }
688 
689 /*
690  * Slab object creation initialisation for the XFS inode.
691  * This covers only the idempotent fields in the XFS inode;
692  * all other fields need to be initialised on allocation
693  * from the slab. This avoids the need to repeatedly initialise
694  * fields in the xfs inode that left in the initialise state
695  * when freeing the inode.
696  */
697 STATIC void
698 xfs_fs_inode_init_once(
699         void                    *inode)
700 {
701         struct xfs_inode        *ip = inode;
702 
703         memset(ip, 0, sizeof(struct xfs_inode));
704 
705         /* vfs inode */
706         inode_init_once(VFS_I(ip));
707 
708         /* xfs inode */
709         atomic_set(&ip->i_pincount, 0);
710         spin_lock_init(&ip->i_flags_lock);
711 
712         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
713                      "xfsino", ip->i_ino);
714         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
715                      "xfsino", ip->i_ino);
716 }
717 
718 /*
719  * We do an unlocked check for XFS_IDONTCACHE here because we are already
720  * serialised against cache hits here via the inode->i_lock and igrab() in
721  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
722  * racing with us, and it avoids needing to grab a spinlock here for every inode
723  * we drop the final reference on.
724  */
725 STATIC int
726 xfs_fs_drop_inode(
727         struct inode            *inode)
728 {
729         struct xfs_inode        *ip = XFS_I(inode);
730 
731         /*
732          * If this unlinked inode is in the middle of recovery, don't
733          * drop the inode just yet; log recovery will take care of
734          * that.  See the comment for this inode flag.
735          */
736         if (ip->i_flags & XFS_IRECOVERY) {
737                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
738                 return 0;
739         }
740 
741         return generic_drop_inode(inode);
742 }
743 
744 static void
745 xfs_mount_free(
746         struct xfs_mount        *mp)
747 {
748         kfree(mp->m_rtname);
749         kfree(mp->m_logname);
750         kmem_free(mp);
751 }
752 
753 STATIC int
754 xfs_fs_sync_fs(
755         struct super_block      *sb,
756         int                     wait)
757 {
758         struct xfs_mount        *mp = XFS_M(sb);
759 
760         /*
761          * Doing anything during the async pass would be counterproductive.
762          */
763         if (!wait)
764                 return 0;
765 
766         xfs_log_force(mp, XFS_LOG_SYNC);
767         if (laptop_mode) {
768                 /*
769                  * The disk must be active because we're syncing.
770                  * We schedule log work now (now that the disk is
771                  * active) instead of later (when it might not be).
772                  */
773                 flush_delayed_work(&mp->m_log->l_work);
774         }
775 
776         return 0;
777 }
778 
779 STATIC int
780 xfs_fs_statfs(
781         struct dentry           *dentry,
782         struct kstatfs          *statp)
783 {
784         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
785         xfs_sb_t                *sbp = &mp->m_sb;
786         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
787         uint64_t                fakeinos, id;
788         uint64_t                icount;
789         uint64_t                ifree;
790         uint64_t                fdblocks;
791         xfs_extlen_t            lsize;
792         int64_t                 ffree;
793 
794         statp->f_type = XFS_SUPER_MAGIC;
795         statp->f_namelen = MAXNAMELEN - 1;
796 
797         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
798         statp->f_fsid = u64_to_fsid(id);
799 
800         icount = percpu_counter_sum(&mp->m_icount);
801         ifree = percpu_counter_sum(&mp->m_ifree);
802         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
803 
804         spin_lock(&mp->m_sb_lock);
805         statp->f_bsize = sbp->sb_blocksize;
806         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
807         statp->f_blocks = sbp->sb_dblocks - lsize;
808         spin_unlock(&mp->m_sb_lock);
809 
810         /* make sure statp->f_bfree does not underflow */
811         statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
812         statp->f_bavail = statp->f_bfree;
813 
814         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
815         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
816         if (M_IGEO(mp)->maxicount)
817                 statp->f_files = min_t(typeof(statp->f_files),
818                                         statp->f_files,
819                                         M_IGEO(mp)->maxicount);
820 
821         /* If sb_icount overshot maxicount, report actual allocation */
822         statp->f_files = max_t(typeof(statp->f_files),
823                                         statp->f_files,
824                                         sbp->sb_icount);
825 
826         /* make sure statp->f_ffree does not underflow */
827         ffree = statp->f_files - (icount - ifree);
828         statp->f_ffree = max_t(int64_t, ffree, 0);
829 
830 
831         if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
832             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
833                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
834                 xfs_qm_statvfs(ip, statp);
835 
836         if (XFS_IS_REALTIME_MOUNT(mp) &&
837             (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
838                 statp->f_blocks = sbp->sb_rblocks;
839                 statp->f_bavail = statp->f_bfree =
840                         sbp->sb_frextents * sbp->sb_rextsize;
841         }
842 
843         return 0;
844 }
845 
846 STATIC void
847 xfs_save_resvblks(struct xfs_mount *mp)
848 {
849         uint64_t resblks = 0;
850 
851         mp->m_resblks_save = mp->m_resblks;
852         xfs_reserve_blocks(mp, &resblks, NULL);
853 }
854 
855 STATIC void
856 xfs_restore_resvblks(struct xfs_mount *mp)
857 {
858         uint64_t resblks;
859 
860         if (mp->m_resblks_save) {
861                 resblks = mp->m_resblks_save;
862                 mp->m_resblks_save = 0;
863         } else
864                 resblks = xfs_default_resblks(mp);
865 
866         xfs_reserve_blocks(mp, &resblks, NULL);
867 }
868 
869 /*
870  * Second stage of a freeze. The data is already frozen so we only
871  * need to take care of the metadata. Once that's done sync the superblock
872  * to the log to dirty it in case of a crash while frozen. This ensures that we
873  * will recover the unlinked inode lists on the next mount.
874  */
875 STATIC int
876 xfs_fs_freeze(
877         struct super_block      *sb)
878 {
879         struct xfs_mount        *mp = XFS_M(sb);
880         unsigned int            flags;
881         int                     ret;
882 
883         /*
884          * The filesystem is now frozen far enough that memory reclaim
885          * cannot safely operate on the filesystem. Hence we need to
886          * set a GFP_NOFS context here to avoid recursion deadlocks.
887          */
888         flags = memalloc_nofs_save();
889         xfs_blockgc_stop(mp);
890         xfs_save_resvblks(mp);
891         ret = xfs_log_quiesce(mp);
892         memalloc_nofs_restore(flags);
893         return ret;
894 }
895 
896 STATIC int
897 xfs_fs_unfreeze(
898         struct super_block      *sb)
899 {
900         struct xfs_mount        *mp = XFS_M(sb);
901 
902         xfs_restore_resvblks(mp);
903         xfs_log_work_queue(mp);
904         xfs_blockgc_start(mp);
905         return 0;
906 }
907 
908 /*
909  * This function fills in xfs_mount_t fields based on mount args.
910  * Note: the superblock _has_ now been read in.
911  */
912 STATIC int
913 xfs_finish_flags(
914         struct xfs_mount        *mp)
915 {
916         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
917 
918         /* Fail a mount where the logbuf is smaller than the log stripe */
919         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
920                 if (mp->m_logbsize <= 0 &&
921                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
922                         mp->m_logbsize = mp->m_sb.sb_logsunit;
923                 } else if (mp->m_logbsize > 0 &&
924                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
925                         xfs_warn(mp,
926                 "logbuf size must be greater than or equal to log stripe size");
927                         return -EINVAL;
928                 }
929         } else {
930                 /* Fail a mount if the logbuf is larger than 32K */
931                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
932                         xfs_warn(mp,
933                 "logbuf size for version 1 logs must be 16K or 32K");
934                         return -EINVAL;
935                 }
936         }
937 
938         /*
939          * V5 filesystems always use attr2 format for attributes.
940          */
941         if (xfs_sb_version_hascrc(&mp->m_sb) &&
942             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
943                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
944                              "attr2 is always enabled for V5 filesystems.");
945                 return -EINVAL;
946         }
947 
948         /*
949          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
950          * told by noattr2 to turn it off
951          */
952         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
953             !(mp->m_flags & XFS_MOUNT_NOATTR2))
954                 mp->m_flags |= XFS_MOUNT_ATTR2;
955 
956         /*
957          * prohibit r/w mounts of read-only filesystems
958          */
959         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
960                 xfs_warn(mp,
961                         "cannot mount a read-only filesystem as read-write");
962                 return -EROFS;
963         }
964 
965         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
966             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
967             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
968                 xfs_warn(mp,
969                   "Super block does not support project and group quota together");
970                 return -EINVAL;
971         }
972 
973         return 0;
974 }
975 
976 static int
977 xfs_init_percpu_counters(
978         struct xfs_mount        *mp)
979 {
980         int             error;
981 
982         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
983         if (error)
984                 return -ENOMEM;
985 
986         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
987         if (error)
988                 goto free_icount;
989 
990         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
991         if (error)
992                 goto free_ifree;
993 
994         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
995         if (error)
996                 goto free_fdblocks;
997 
998         return 0;
999 
1000 free_fdblocks:
1001         percpu_counter_destroy(&mp->m_fdblocks);
1002 free_ifree:
1003         percpu_counter_destroy(&mp->m_ifree);
1004 free_icount:
1005         percpu_counter_destroy(&mp->m_icount);
1006         return -ENOMEM;
1007 }
1008 
1009 void
1010 xfs_reinit_percpu_counters(
1011         struct xfs_mount        *mp)
1012 {
1013         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1014         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1015         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1016 }
1017 
1018 static void
1019 xfs_destroy_percpu_counters(
1020         struct xfs_mount        *mp)
1021 {
1022         percpu_counter_destroy(&mp->m_icount);
1023         percpu_counter_destroy(&mp->m_ifree);
1024         percpu_counter_destroy(&mp->m_fdblocks);
1025         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1026                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1027         percpu_counter_destroy(&mp->m_delalloc_blks);
1028 }
1029 
1030 static void
1031 xfs_fs_put_super(
1032         struct super_block      *sb)
1033 {
1034         struct xfs_mount        *mp = XFS_M(sb);
1035 
1036         /* if ->fill_super failed, we have no mount to tear down */
1037         if (!sb->s_fs_info)
1038                 return;
1039 
1040         xfs_notice(mp, "Unmounting Filesystem");
1041         xfs_filestream_unmount(mp);
1042         xfs_unmountfs(mp);
1043 
1044         xfs_freesb(mp);
1045         free_percpu(mp->m_stats.xs_stats);
1046         xfs_destroy_percpu_counters(mp);
1047         xfs_destroy_mount_workqueues(mp);
1048         xfs_close_devices(mp);
1049 
1050         sb->s_fs_info = NULL;
1051         xfs_mount_free(mp);
1052 }
1053 
1054 static long
1055 xfs_fs_nr_cached_objects(
1056         struct super_block      *sb,
1057         struct shrink_control   *sc)
1058 {
1059         /* Paranoia: catch incorrect calls during mount setup or teardown */
1060         if (WARN_ON_ONCE(!sb->s_fs_info))
1061                 return 0;
1062         return xfs_reclaim_inodes_count(XFS_M(sb));
1063 }
1064 
1065 static long
1066 xfs_fs_free_cached_objects(
1067         struct super_block      *sb,
1068         struct shrink_control   *sc)
1069 {
1070         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1071 }
1072 
1073 static const struct super_operations xfs_super_operations = {
1074         .alloc_inode            = xfs_fs_alloc_inode,
1075         .destroy_inode          = xfs_fs_destroy_inode,
1076         .dirty_inode            = xfs_fs_dirty_inode,
1077         .drop_inode             = xfs_fs_drop_inode,
1078         .put_super              = xfs_fs_put_super,
1079         .sync_fs                = xfs_fs_sync_fs,
1080         .freeze_fs              = xfs_fs_freeze,
1081         .unfreeze_fs            = xfs_fs_unfreeze,
1082         .statfs                 = xfs_fs_statfs,
1083         .show_options           = xfs_fs_show_options,
1084         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1085         .free_cached_objects    = xfs_fs_free_cached_objects,
1086 };
1087 
1088 static int
1089 suffix_kstrtoint(
1090         const char      *s,
1091         unsigned int    base,
1092         int             *res)
1093 {
1094         int             last, shift_left_factor = 0, _res;
1095         char            *value;
1096         int             ret = 0;
1097 
1098         value = kstrdup(s, GFP_KERNEL);
1099         if (!value)
1100                 return -ENOMEM;
1101 
1102         last = strlen(value) - 1;
1103         if (value[last] == 'K' || value[last] == 'k') {
1104                 shift_left_factor = 10;
1105                 value[last] = '\0';
1106         }
1107         if (value[last] == 'M' || value[last] == 'm') {
1108                 shift_left_factor = 20;
1109                 value[last] = '\0';
1110         }
1111         if (value[last] == 'G' || value[last] == 'g') {
1112                 shift_left_factor = 30;
1113                 value[last] = '\0';
1114         }
1115 
1116         if (kstrtoint(value, base, &_res))
1117                 ret = -EINVAL;
1118         kfree(value);
1119         *res = _res << shift_left_factor;
1120         return ret;
1121 }
1122 
1123 static inline void
1124 xfs_fs_warn_deprecated(
1125         struct fs_context       *fc,
1126         struct fs_parameter     *param,
1127         uint64_t                flag,
1128         bool                    value)
1129 {
1130         /* Don't print the warning if reconfiguring and current mount point
1131          * already had the flag set
1132          */
1133         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1134                         !!(XFS_M(fc->root->d_sb)->m_flags & flag) == value)
1135                 return;
1136         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1137 }
1138 
1139 /*
1140  * Set mount state from a mount option.
1141  *
1142  * NOTE: mp->m_super is NULL here!
1143  */
1144 static int
1145 xfs_fs_parse_param(
1146         struct fs_context       *fc,
1147         struct fs_parameter     *param)
1148 {
1149         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1150         struct fs_parse_result  result;
1151         int                     size = 0;
1152         int                     opt;
1153 
1154         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1155         if (opt < 0)
1156                 return opt;
1157 
1158         switch (opt) {
1159         case Opt_logbufs:
1160                 parsing_mp->m_logbufs = result.uint_32;
1161                 return 0;
1162         case Opt_logbsize:
1163                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1164                         return -EINVAL;
1165                 return 0;
1166         case Opt_logdev:
1167                 kfree(parsing_mp->m_logname);
1168                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1169                 if (!parsing_mp->m_logname)
1170                         return -ENOMEM;
1171                 return 0;
1172         case Opt_rtdev:
1173                 kfree(parsing_mp->m_rtname);
1174                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1175                 if (!parsing_mp->m_rtname)
1176                         return -ENOMEM;
1177                 return 0;
1178         case Opt_allocsize:
1179                 if (suffix_kstrtoint(param->string, 10, &size))
1180                         return -EINVAL;
1181                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1182                 parsing_mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1183                 return 0;
1184         case Opt_grpid:
1185         case Opt_bsdgroups:
1186                 parsing_mp->m_flags |= XFS_MOUNT_GRPID;
1187                 return 0;
1188         case Opt_nogrpid:
1189         case Opt_sysvgroups:
1190                 parsing_mp->m_flags &= ~XFS_MOUNT_GRPID;
1191                 return 0;
1192         case Opt_wsync:
1193                 parsing_mp->m_flags |= XFS_MOUNT_WSYNC;
1194                 return 0;
1195         case Opt_norecovery:
1196                 parsing_mp->m_flags |= XFS_MOUNT_NORECOVERY;
1197                 return 0;
1198         case Opt_noalign:
1199                 parsing_mp->m_flags |= XFS_MOUNT_NOALIGN;
1200                 return 0;
1201         case Opt_swalloc:
1202                 parsing_mp->m_flags |= XFS_MOUNT_SWALLOC;
1203                 return 0;
1204         case Opt_sunit:
1205                 parsing_mp->m_dalign = result.uint_32;
1206                 return 0;
1207         case Opt_swidth:
1208                 parsing_mp->m_swidth = result.uint_32;
1209                 return 0;
1210         case Opt_inode32:
1211                 parsing_mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1212                 return 0;
1213         case Opt_inode64:
1214                 parsing_mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1215                 return 0;
1216         case Opt_nouuid:
1217                 parsing_mp->m_flags |= XFS_MOUNT_NOUUID;
1218                 return 0;
1219         case Opt_largeio:
1220                 parsing_mp->m_flags |= XFS_MOUNT_LARGEIO;
1221                 return 0;
1222         case Opt_nolargeio:
1223                 parsing_mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1224                 return 0;
1225         case Opt_filestreams:
1226                 parsing_mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1227                 return 0;
1228         case Opt_noquota:
1229                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1230                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1231                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
1232                 return 0;
1233         case Opt_quota:
1234         case Opt_uquota:
1235         case Opt_usrquota:
1236                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
1237                                  XFS_UQUOTA_ENFD);
1238                 return 0;
1239         case Opt_qnoenforce:
1240         case Opt_uqnoenforce:
1241                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1242                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1243                 return 0;
1244         case Opt_pquota:
1245         case Opt_prjquota:
1246                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1247                                  XFS_PQUOTA_ENFD);
1248                 return 0;
1249         case Opt_pqnoenforce:
1250                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1251                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1252                 return 0;
1253         case Opt_gquota:
1254         case Opt_grpquota:
1255                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1256                                  XFS_GQUOTA_ENFD);
1257                 return 0;
1258         case Opt_gqnoenforce:
1259                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1260                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1261                 return 0;
1262         case Opt_discard:
1263                 parsing_mp->m_flags |= XFS_MOUNT_DISCARD;
1264                 return 0;
1265         case Opt_nodiscard:
1266                 parsing_mp->m_flags &= ~XFS_MOUNT_DISCARD;
1267                 return 0;
1268 #ifdef CONFIG_FS_DAX
1269         case Opt_dax:
1270                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1271                 return 0;
1272         case Opt_dax_enum:
1273                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1274                 return 0;
1275 #endif
1276         /* Following mount options will be removed in September 2025 */
1277         case Opt_ikeep:
1278                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
1279                 parsing_mp->m_flags |= XFS_MOUNT_IKEEP;
1280                 return 0;
1281         case Opt_noikeep:
1282                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, false);
1283                 parsing_mp->m_flags &= ~XFS_MOUNT_IKEEP;
1284                 return 0;
1285         case Opt_attr2:
1286                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_ATTR2, true);
1287                 parsing_mp->m_flags |= XFS_MOUNT_ATTR2;
1288                 return 0;
1289         case Opt_noattr2:
1290                 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_NOATTR2, true);
1291                 parsing_mp->m_flags &= ~XFS_MOUNT_ATTR2;
1292                 parsing_mp->m_flags |= XFS_MOUNT_NOATTR2;
1293                 return 0;
1294         default:
1295                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1296                 return -EINVAL;
1297         }
1298 
1299         return 0;
1300 }
1301 
1302 static int
1303 xfs_fs_validate_params(
1304         struct xfs_mount        *mp)
1305 {
1306         /*
1307          * no recovery flag requires a read-only mount
1308          */
1309         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1310             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1311                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1312                 return -EINVAL;
1313         }
1314 
1315         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1316             (mp->m_dalign || mp->m_swidth)) {
1317                 xfs_warn(mp,
1318         "sunit and swidth options incompatible with the noalign option");
1319                 return -EINVAL;
1320         }
1321 
1322         if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1323                 xfs_warn(mp, "quota support not available in this kernel.");
1324                 return -EINVAL;
1325         }
1326 
1327         if ((mp->m_dalign && !mp->m_swidth) ||
1328             (!mp->m_dalign && mp->m_swidth)) {
1329                 xfs_warn(mp, "sunit and swidth must be specified together");
1330                 return -EINVAL;
1331         }
1332 
1333         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1334                 xfs_warn(mp,
1335         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1336                         mp->m_swidth, mp->m_dalign);
1337                 return -EINVAL;
1338         }
1339 
1340         if (mp->m_logbufs != -1 &&
1341             mp->m_logbufs != 0 &&
1342             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1343              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1344                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1345                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1346                 return -EINVAL;
1347         }
1348 
1349         if (mp->m_logbsize != -1 &&
1350             mp->m_logbsize !=  0 &&
1351             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1352              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1353              !is_power_of_2(mp->m_logbsize))) {
1354                 xfs_warn(mp,
1355                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1356                         mp->m_logbsize);
1357                 return -EINVAL;
1358         }
1359 
1360         if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1361             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1362              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1363                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1364                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1365                 return -EINVAL;
1366         }
1367 
1368         return 0;
1369 }
1370 
1371 static int
1372 xfs_fs_fill_super(
1373         struct super_block      *sb,
1374         struct fs_context       *fc)
1375 {
1376         struct xfs_mount        *mp = sb->s_fs_info;
1377         struct inode            *root;
1378         int                     flags = 0, error;
1379 
1380         mp->m_super = sb;
1381 
1382         error = xfs_fs_validate_params(mp);
1383         if (error)
1384                 goto out_free_names;
1385 
1386         sb_min_blocksize(sb, BBSIZE);
1387         sb->s_xattr = xfs_xattr_handlers;
1388         sb->s_export_op = &xfs_export_operations;
1389 #ifdef CONFIG_XFS_QUOTA
1390         sb->s_qcop = &xfs_quotactl_operations;
1391         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1392 #endif
1393         sb->s_op = &xfs_super_operations;
1394 
1395         /*
1396          * Delay mount work if the debug hook is set. This is debug
1397          * instrumention to coordinate simulation of xfs mount failures with
1398          * VFS superblock operations
1399          */
1400         if (xfs_globals.mount_delay) {
1401                 xfs_notice(mp, "Delaying mount for %d seconds.",
1402                         xfs_globals.mount_delay);
1403                 msleep(xfs_globals.mount_delay * 1000);
1404         }
1405 
1406         if (fc->sb_flags & SB_SILENT)
1407                 flags |= XFS_MFSI_QUIET;
1408 
1409         error = xfs_open_devices(mp);
1410         if (error)
1411                 goto out_free_names;
1412 
1413         error = xfs_init_mount_workqueues(mp);
1414         if (error)
1415                 goto out_close_devices;
1416 
1417         error = xfs_init_percpu_counters(mp);
1418         if (error)
1419                 goto out_destroy_workqueues;
1420 
1421         /* Allocate stats memory before we do operations that might use it */
1422         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1423         if (!mp->m_stats.xs_stats) {
1424                 error = -ENOMEM;
1425                 goto out_destroy_counters;
1426         }
1427 
1428         error = xfs_readsb(mp, flags);
1429         if (error)
1430                 goto out_free_stats;
1431 
1432         error = xfs_finish_flags(mp);
1433         if (error)
1434                 goto out_free_sb;
1435 
1436         error = xfs_setup_devices(mp);
1437         if (error)
1438                 goto out_free_sb;
1439 
1440         /* V4 support is undergoing deprecation. */
1441         if (!xfs_sb_version_hascrc(&mp->m_sb)) {
1442 #ifdef CONFIG_XFS_SUPPORT_V4
1443                 xfs_warn_once(mp,
1444         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1445 #else
1446                 xfs_warn(mp,
1447         "Deprecated V4 format (crc=0) not supported by kernel.");
1448                 error = -EINVAL;
1449                 goto out_free_sb;
1450 #endif
1451         }
1452 
1453         /* Filesystem claims it needs repair, so refuse the mount. */
1454         if (xfs_sb_version_needsrepair(&mp->m_sb)) {
1455                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1456                 error = -EFSCORRUPTED;
1457                 goto out_free_sb;
1458         }
1459 
1460         /*
1461          * Don't touch the filesystem if a user tool thinks it owns the primary
1462          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1463          * we don't check them at all.
1464          */
1465         if (mp->m_sb.sb_inprogress) {
1466                 xfs_warn(mp, "Offline file system operation in progress!");
1467                 error = -EFSCORRUPTED;
1468                 goto out_free_sb;
1469         }
1470 
1471         /*
1472          * Until this is fixed only page-sized or smaller data blocks work.
1473          */
1474         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1475                 xfs_warn(mp,
1476                 "File system with blocksize %d bytes. "
1477                 "Only pagesize (%ld) or less will currently work.",
1478                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1479                 error = -ENOSYS;
1480                 goto out_free_sb;
1481         }
1482 
1483         /* Ensure this filesystem fits in the page cache limits */
1484         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1485             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1486                 xfs_warn(mp,
1487                 "file system too large to be mounted on this system.");
1488                 error = -EFBIG;
1489                 goto out_free_sb;
1490         }
1491 
1492         /*
1493          * XFS block mappings use 54 bits to store the logical block offset.
1494          * This should suffice to handle the maximum file size that the VFS
1495          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1496          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1497          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1498          * to check this assertion.
1499          *
1500          * Avoid integer overflow by comparing the maximum bmbt offset to the
1501          * maximum pagecache offset in units of fs blocks.
1502          */
1503         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1504                 xfs_warn(mp,
1505 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1506                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1507                          XFS_MAX_FILEOFF);
1508                 error = -EINVAL;
1509                 goto out_free_sb;
1510         }
1511 
1512         error = xfs_filestream_mount(mp);
1513         if (error)
1514                 goto out_free_sb;
1515 
1516         /*
1517          * we must configure the block size in the superblock before we run the
1518          * full mount process as the mount process can lookup and cache inodes.
1519          */
1520         sb->s_magic = XFS_SUPER_MAGIC;
1521         sb->s_blocksize = mp->m_sb.sb_blocksize;
1522         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1523         sb->s_maxbytes = MAX_LFS_FILESIZE;
1524         sb->s_max_links = XFS_MAXLINK;
1525         sb->s_time_gran = 1;
1526         if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
1527                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1528                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1529         } else {
1530                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1531                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1532         }
1533         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1534         sb->s_iflags |= SB_I_CGROUPWB;
1535 
1536         set_posix_acl_flag(sb);
1537 
1538         /* version 5 superblocks support inode version counters. */
1539         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1540                 sb->s_flags |= SB_I_VERSION;
1541 
1542         if (xfs_sb_version_hasbigtime(&mp->m_sb))
1543                 xfs_warn(mp,
1544  "EXPERIMENTAL big timestamp feature in use. Use at your own risk!");
1545 
1546         if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
1547                 bool rtdev_is_dax = false, datadev_is_dax;
1548 
1549                 xfs_warn(mp,
1550                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1551 
1552                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1553                         sb->s_blocksize);
1554                 if (mp->m_rtdev_targp)
1555                         rtdev_is_dax = bdev_dax_supported(
1556                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1557                 if (!rtdev_is_dax && !datadev_is_dax) {
1558                         xfs_alert(mp,
1559                         "DAX unsupported by block device. Turning off DAX.");
1560                         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1561                 }
1562                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1563                         xfs_alert(mp,
1564                 "DAX and reflink cannot be used together!");
1565                         error = -EINVAL;
1566                         goto out_filestream_unmount;
1567                 }
1568         }
1569 
1570         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1571                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1572 
1573                 if (!blk_queue_discard(q)) {
1574                         xfs_warn(mp, "mounting with \"discard\" option, but "
1575                                         "the device does not support discard");
1576                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1577                 }
1578         }
1579 
1580         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1581                 if (mp->m_sb.sb_rblocks) {
1582                         xfs_alert(mp,
1583         "reflink not compatible with realtime device!");
1584                         error = -EINVAL;
1585                         goto out_filestream_unmount;
1586                 }
1587 
1588                 if (xfs_globals.always_cow) {
1589                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1590                         mp->m_always_cow = true;
1591                 }
1592         }
1593 
1594         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1595                 xfs_alert(mp,
1596         "reverse mapping btree not compatible with realtime device!");
1597                 error = -EINVAL;
1598                 goto out_filestream_unmount;
1599         }
1600 
1601         if (xfs_sb_version_hasinobtcounts(&mp->m_sb))
1602                 xfs_warn(mp,
1603  "EXPERIMENTAL inode btree counters feature in use. Use at your own risk!");
1604 
1605         error = xfs_mountfs(mp);
1606         if (error)
1607                 goto out_filestream_unmount;
1608 
1609         root = igrab(VFS_I(mp->m_rootip));
1610         if (!root) {
1611                 error = -ENOENT;
1612                 goto out_unmount;
1613         }
1614         sb->s_root = d_make_root(root);
1615         if (!sb->s_root) {
1616                 error = -ENOMEM;
1617                 goto out_unmount;
1618         }
1619 
1620         return 0;
1621 
1622  out_filestream_unmount:
1623         xfs_filestream_unmount(mp);
1624  out_free_sb:
1625         xfs_freesb(mp);
1626  out_free_stats:
1627         free_percpu(mp->m_stats.xs_stats);
1628  out_destroy_counters:
1629         xfs_destroy_percpu_counters(mp);
1630  out_destroy_workqueues:
1631         xfs_destroy_mount_workqueues(mp);
1632  out_close_devices:
1633         xfs_close_devices(mp);
1634  out_free_names:
1635         sb->s_fs_info = NULL;
1636         xfs_mount_free(mp);
1637         return error;
1638 
1639  out_unmount:
1640         xfs_filestream_unmount(mp);
1641         xfs_unmountfs(mp);
1642         goto out_free_sb;
1643 }
1644 
1645 static int
1646 xfs_fs_get_tree(
1647         struct fs_context       *fc)
1648 {
1649         return get_tree_bdev(fc, xfs_fs_fill_super);
1650 }
1651 
1652 static int
1653 xfs_remount_rw(
1654         struct xfs_mount        *mp)
1655 {
1656         struct xfs_sb           *sbp = &mp->m_sb;
1657         int error;
1658 
1659         if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1660                 xfs_warn(mp,
1661                         "ro->rw transition prohibited on norecovery mount");
1662                 return -EINVAL;
1663         }
1664 
1665         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1666             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1667                 xfs_warn(mp,
1668         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1669                         (sbp->sb_features_ro_compat &
1670                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1671                 return -EINVAL;
1672         }
1673 
1674         mp->m_flags &= ~XFS_MOUNT_RDONLY;
1675 
1676         /*
1677          * If this is the first remount to writeable state we might have some
1678          * superblock changes to update.
1679          */
1680         if (mp->m_update_sb) {
1681                 error = xfs_sync_sb(mp, false);
1682                 if (error) {
1683                         xfs_warn(mp, "failed to write sb changes");
1684                         return error;
1685                 }
1686                 mp->m_update_sb = false;
1687         }
1688 
1689         /*
1690          * Fill out the reserve pool if it is empty. Use the stashed value if
1691          * it is non-zero, otherwise go with the default.
1692          */
1693         xfs_restore_resvblks(mp);
1694         xfs_log_work_queue(mp);
1695 
1696         /* Recover any CoW blocks that never got remapped. */
1697         error = xfs_reflink_recover_cow(mp);
1698         if (error) {
1699                 xfs_err(mp,
1700                         "Error %d recovering leftover CoW allocations.", error);
1701                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1702                 return error;
1703         }
1704         xfs_blockgc_start(mp);
1705 
1706         /* Create the per-AG metadata reservation pool .*/
1707         error = xfs_fs_reserve_ag_blocks(mp);
1708         if (error && error != -ENOSPC)
1709                 return error;
1710 
1711         return 0;
1712 }
1713 
1714 static int
1715 xfs_remount_ro(
1716         struct xfs_mount        *mp)
1717 {
1718         int error;
1719 
1720         /*
1721          * Cancel background eofb scanning so it cannot race with the final
1722          * log force+buftarg wait and deadlock the remount.
1723          */
1724         xfs_blockgc_stop(mp);
1725 
1726         /* Get rid of any leftover CoW reservations... */
1727         error = xfs_blockgc_free_space(mp, NULL);
1728         if (error) {
1729                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1730                 return error;
1731         }
1732 
1733         /* Free the per-AG metadata reservation pool. */
1734         error = xfs_fs_unreserve_ag_blocks(mp);
1735         if (error) {
1736                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1737                 return error;
1738         }
1739 
1740         /*
1741          * Before we sync the metadata, we need to free up the reserve block
1742          * pool so that the used block count in the superblock on disk is
1743          * correct at the end of the remount. Stash the current* reserve pool
1744          * size so that if we get remounted rw, we can return it to the same
1745          * size.
1746          */
1747         xfs_save_resvblks(mp);
1748 
1749         xfs_log_clean(mp);
1750         mp->m_flags |= XFS_MOUNT_RDONLY;
1751 
1752         return 0;
1753 }
1754 
1755 /*
1756  * Logically we would return an error here to prevent users from believing
1757  * they might have changed mount options using remount which can't be changed.
1758  *
1759  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1760  * arguments in some cases so we can't blindly reject options, but have to
1761  * check for each specified option if it actually differs from the currently
1762  * set option and only reject it if that's the case.
1763  *
1764  * Until that is implemented we return success for every remount request, and
1765  * silently ignore all options that we can't actually change.
1766  */
1767 static int
1768 xfs_fs_reconfigure(
1769         struct fs_context *fc)
1770 {
1771         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1772         struct xfs_mount        *new_mp = fc->s_fs_info;
1773         xfs_sb_t                *sbp = &mp->m_sb;
1774         int                     flags = fc->sb_flags;
1775         int                     error;
1776 
1777         /* version 5 superblocks always support version counters. */
1778         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1779                 fc->sb_flags |= SB_I_VERSION;
1780 
1781         error = xfs_fs_validate_params(new_mp);
1782         if (error)
1783                 return error;
1784 
1785         sync_filesystem(mp->m_super);
1786 
1787         /* inode32 -> inode64 */
1788         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1789             !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1790                 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1791                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1792         }
1793 
1794         /* inode64 -> inode32 */
1795         if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1796             (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1797                 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1798                 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1799         }
1800 
1801         /* ro -> rw */
1802         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1803                 error = xfs_remount_rw(mp);
1804                 if (error)
1805                         return error;
1806         }
1807 
1808         /* rw -> ro */
1809         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1810                 error = xfs_remount_ro(mp);
1811                 if (error)
1812                         return error;
1813         }
1814 
1815         return 0;
1816 }
1817 
1818 static void xfs_fs_free(
1819         struct fs_context       *fc)
1820 {
1821         struct xfs_mount        *mp = fc->s_fs_info;
1822 
1823         /*
1824          * mp is stored in the fs_context when it is initialized.
1825          * mp is transferred to the superblock on a successful mount,
1826          * but if an error occurs before the transfer we have to free
1827          * it here.
1828          */
1829         if (mp)
1830                 xfs_mount_free(mp);
1831 }
1832 
1833 static const struct fs_context_operations xfs_context_ops = {
1834         .parse_param = xfs_fs_parse_param,
1835         .get_tree    = xfs_fs_get_tree,
1836         .reconfigure = xfs_fs_reconfigure,
1837         .free        = xfs_fs_free,
1838 };
1839 
1840 static int xfs_init_fs_context(
1841         struct fs_context       *fc)
1842 {
1843         struct xfs_mount        *mp;
1844 
1845         mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1846         if (!mp)
1847                 return -ENOMEM;
1848 
1849         spin_lock_init(&mp->m_sb_lock);
1850         spin_lock_init(&mp->m_agirotor_lock);
1851         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1852         spin_lock_init(&mp->m_perag_lock);
1853         mutex_init(&mp->m_growlock);
1854         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1855         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1856         mp->m_kobj.kobject.kset = xfs_kset;
1857         /*
1858          * We don't create the finobt per-ag space reservation until after log
1859          * recovery, so we must set this to true so that an ifree transaction
1860          * started during log recovery will not depend on space reservations
1861          * for finobt expansion.
1862          */
1863         mp->m_finobt_nores = true;
1864 
1865         /*
1866          * These can be overridden by the mount option parsing.
1867          */
1868         mp->m_logbufs = -1;
1869         mp->m_logbsize = -1;
1870         mp->m_allocsize_log = 16; /* 64k */
1871 
1872         /*
1873          * Copy binary VFS mount flags we are interested in.
1874          */
1875         if (fc->sb_flags & SB_RDONLY)
1876                 mp->m_flags |= XFS_MOUNT_RDONLY;
1877         if (fc->sb_flags & SB_DIRSYNC)
1878                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1879         if (fc->sb_flags & SB_SYNCHRONOUS)
1880                 mp->m_flags |= XFS_MOUNT_WSYNC;
1881 
1882         fc->s_fs_info = mp;
1883         fc->ops = &xfs_context_ops;
1884 
1885         return 0;
1886 }
1887 
1888 static struct file_system_type xfs_fs_type = {
1889         .owner                  = THIS_MODULE,
1890         .name                   = "xfs",
1891         .init_fs_context        = xfs_init_fs_context,
1892         .parameters             = xfs_fs_parameters,
1893         .kill_sb                = kill_block_super,
1894         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1895 };
1896 MODULE_ALIAS_FS("xfs");
1897 
1898 STATIC int __init
1899 xfs_init_zones(void)
1900 {
1901         xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1902                                                 sizeof(struct xlog_ticket),
1903                                                 0, 0, NULL);
1904         if (!xfs_log_ticket_zone)
1905                 goto out;
1906 
1907         xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1908                                         sizeof(struct xfs_extent_free_item),
1909                                         0, 0, NULL);
1910         if (!xfs_bmap_free_item_zone)
1911                 goto out_destroy_log_ticket_zone;
1912 
1913         xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1914                                                sizeof(struct xfs_btree_cur),
1915                                                0, 0, NULL);
1916         if (!xfs_btree_cur_zone)
1917                 goto out_destroy_bmap_free_item_zone;
1918 
1919         xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1920                                               sizeof(struct xfs_da_state),
1921                                               0, 0, NULL);
1922         if (!xfs_da_state_zone)
1923                 goto out_destroy_btree_cur_zone;
1924 
1925         xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1926                                            sizeof(struct xfs_ifork),
1927                                            0, 0, NULL);
1928         if (!xfs_ifork_zone)
1929                 goto out_destroy_da_state_zone;
1930 
1931         xfs_trans_zone = kmem_cache_create("xfs_trans",
1932                                            sizeof(struct xfs_trans),
1933                                            0, 0, NULL);
1934         if (!xfs_trans_zone)
1935                 goto out_destroy_ifork_zone;
1936 
1937 
1938         /*
1939          * The size of the zone allocated buf log item is the maximum
1940          * size possible under XFS.  This wastes a little bit of memory,
1941          * but it is much faster.
1942          */
1943         xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1944                                               sizeof(struct xfs_buf_log_item),
1945                                               0, 0, NULL);
1946         if (!xfs_buf_item_zone)
1947                 goto out_destroy_trans_zone;
1948 
1949         xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1950                                         (sizeof(struct xfs_efd_log_item) +
1951                                         (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1952                                         sizeof(struct xfs_extent)),
1953                                         0, 0, NULL);
1954         if (!xfs_efd_zone)
1955                 goto out_destroy_buf_item_zone;
1956 
1957         xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1958                                          (sizeof(struct xfs_efi_log_item) +
1959                                          (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1960                                          sizeof(struct xfs_extent)),
1961                                          0, 0, NULL);
1962         if (!xfs_efi_zone)
1963                 goto out_destroy_efd_zone;
1964 
1965         xfs_inode_zone = kmem_cache_create("xfs_inode",
1966                                            sizeof(struct xfs_inode), 0,
1967                                            (SLAB_HWCACHE_ALIGN |
1968                                             SLAB_RECLAIM_ACCOUNT |
1969                                             SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1970                                            xfs_fs_inode_init_once);
1971         if (!xfs_inode_zone)
1972                 goto out_destroy_efi_zone;
1973 
1974         xfs_ili_zone = kmem_cache_create("xfs_ili",
1975                                          sizeof(struct xfs_inode_log_item), 0,
1976                                          SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1977                                          NULL);
1978         if (!xfs_ili_zone)
1979                 goto out_destroy_inode_zone;
1980 
1981         xfs_icreate_zone = kmem_cache_create("xfs_icr",
1982                                              sizeof(struct xfs_icreate_item),
1983                                              0, 0, NULL);
1984         if (!xfs_icreate_zone)
1985                 goto out_destroy_ili_zone;
1986 
1987         xfs_rud_zone = kmem_cache_create("xfs_rud_item",
1988                                          sizeof(struct xfs_rud_log_item),
1989                                          0, 0, NULL);
1990         if (!xfs_rud_zone)
1991                 goto out_destroy_icreate_zone;
1992 
1993         xfs_rui_zone = kmem_cache_create("xfs_rui_item",
1994                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1995                         0, 0, NULL);
1996         if (!xfs_rui_zone)
1997                 goto out_destroy_rud_zone;
1998 
1999         xfs_cud_zone = kmem_cache_create("xfs_cud_item",
2000                                          sizeof(struct xfs_cud_log_item),
2001                                          0, 0, NULL);
2002         if (!xfs_cud_zone)
2003                 goto out_destroy_rui_zone;
2004 
2005         xfs_cui_zone = kmem_cache_create("xfs_cui_item",
2006                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2007                         0, 0, NULL);
2008         if (!xfs_cui_zone)
2009                 goto out_destroy_cud_zone;
2010 
2011         xfs_bud_zone = kmem_cache_create("xfs_bud_item",
2012                                          sizeof(struct xfs_bud_log_item),
2013                                          0, 0, NULL);
2014         if (!xfs_bud_zone)
2015                 goto out_destroy_cui_zone;
2016 
2017         xfs_bui_zone = kmem_cache_create("xfs_bui_item",
2018                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2019                         0, 0, NULL);
2020         if (!xfs_bui_zone)
2021                 goto out_destroy_bud_zone;
2022 
2023         return 0;
2024 
2025  out_destroy_bud_zone:
2026         kmem_cache_destroy(xfs_bud_zone);
2027  out_destroy_cui_zone:
2028         kmem_cache_destroy(xfs_cui_zone);
2029  out_destroy_cud_zone:
2030         kmem_cache_destroy(xfs_cud_zone);
2031  out_destroy_rui_zone:
2032         kmem_cache_destroy(xfs_rui_zone);
2033  out_destroy_rud_zone:
2034         kmem_cache_destroy(xfs_rud_zone);
2035  out_destroy_icreate_zone:
2036         kmem_cache_destroy(xfs_icreate_zone);
2037  out_destroy_ili_zone:
2038         kmem_cache_destroy(xfs_ili_zone);
2039  out_destroy_inode_zone:
2040         kmem_cache_destroy(xfs_inode_zone);
2041  out_destroy_efi_zone:
2042         kmem_cache_destroy(xfs_efi_zone);
2043  out_destroy_efd_zone:
2044         kmem_cache_destroy(xfs_efd_zone);
2045  out_destroy_buf_item_zone:
2046         kmem_cache_destroy(xfs_buf_item_zone);
2047  out_destroy_trans_zone:
2048         kmem_cache_destroy(xfs_trans_zone);
2049  out_destroy_ifork_zone:
2050         kmem_cache_destroy(xfs_ifork_zone);
2051  out_destroy_da_state_zone:
2052         kmem_cache_destroy(xfs_da_state_zone);
2053  out_destroy_btree_cur_zone:
2054         kmem_cache_destroy(xfs_btree_cur_zone);
2055  out_destroy_bmap_free_item_zone:
2056         kmem_cache_destroy(xfs_bmap_free_item_zone);
2057  out_destroy_log_ticket_zone:
2058         kmem_cache_destroy(xfs_log_ticket_zone);
2059  out:
2060         return -ENOMEM;
2061 }
2062 
2063 STATIC void
2064 xfs_destroy_zones(void)
2065 {
2066         /*
2067          * Make sure all delayed rcu free are flushed before we
2068          * destroy caches.
2069          */
2070         rcu_barrier();
2071         kmem_cache_destroy(xfs_bui_zone);
2072         kmem_cache_destroy(xfs_bud_zone);
2073         kmem_cache_destroy(xfs_cui_zone);
2074         kmem_cache_destroy(xfs_cud_zone);
2075         kmem_cache_destroy(xfs_rui_zone);
2076         kmem_cache_destroy(xfs_rud_zone);
2077         kmem_cache_destroy(xfs_icreate_zone);
2078         kmem_cache_destroy(xfs_ili_zone);
2079         kmem_cache_destroy(xfs_inode_zone);
2080         kmem_cache_destroy(xfs_efi_zone);
2081         kmem_cache_destroy(xfs_efd_zone);
2082         kmem_cache_destroy(xfs_buf_item_zone);
2083         kmem_cache_destroy(xfs_trans_zone);
2084         kmem_cache_destroy(xfs_ifork_zone);
2085         kmem_cache_destroy(xfs_da_state_zone);
2086         kmem_cache_destroy(xfs_btree_cur_zone);
2087         kmem_cache_destroy(xfs_bmap_free_item_zone);
2088         kmem_cache_destroy(xfs_log_ticket_zone);
2089 }
2090 
2091 STATIC int __init
2092 xfs_init_workqueues(void)
2093 {
2094         /*
2095          * The allocation workqueue can be used in memory reclaim situations
2096          * (writepage path), and parallelism is only limited by the number of
2097          * AGs in all the filesystems mounted. Hence use the default large
2098          * max_active value for this workqueue.
2099          */
2100         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2101                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2102         if (!xfs_alloc_wq)
2103                 return -ENOMEM;
2104 
2105         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2106                         0);
2107         if (!xfs_discard_wq)
2108                 goto out_free_alloc_wq;
2109 
2110         return 0;
2111 out_free_alloc_wq:
2112         destroy_workqueue(xfs_alloc_wq);
2113         return -ENOMEM;
2114 }
2115 
2116 STATIC void
2117 xfs_destroy_workqueues(void)
2118 {
2119         destroy_workqueue(xfs_discard_wq);
2120         destroy_workqueue(xfs_alloc_wq);
2121 }
2122 
2123 STATIC int __init
2124 init_xfs_fs(void)
2125 {
2126         int                     error;
2127 
2128         xfs_check_ondisk_structs();
2129 
2130         printk(KERN_INFO XFS_VERSION_STRING " with "
2131                          XFS_BUILD_OPTIONS " enabled\n");
2132 
2133         xfs_dir_startup();
2134 
2135         error = xfs_init_zones();
2136         if (error)
2137                 goto out;
2138 
2139         error = xfs_init_workqueues();
2140         if (error)
2141                 goto out_destroy_zones;
2142 
2143         error = xfs_mru_cache_init();
2144         if (error)
2145                 goto out_destroy_wq;
2146 
2147         error = xfs_buf_init();
2148         if (error)
2149                 goto out_mru_cache_uninit;
2150 
2151         error = xfs_init_procfs();
2152         if (error)
2153                 goto out_buf_terminate;
2154 
2155         error = xfs_sysctl_register();
2156         if (error)
2157                 goto out_cleanup_procfs;
2158 
2159         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2160         if (!xfs_kset) {
2161                 error = -ENOMEM;
2162                 goto out_sysctl_unregister;
2163         }
2164 
2165         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2166 
2167         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2168         if (!xfsstats.xs_stats) {
2169                 error = -ENOMEM;
2170                 goto out_kset_unregister;
2171         }
2172 
2173         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2174                                "stats");
2175         if (error)
2176                 goto out_free_stats;
2177 
2178 #ifdef DEBUG
2179         xfs_dbg_kobj.kobject.kset = xfs_kset;
2180         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2181         if (error)
2182                 goto out_remove_stats_kobj;
2183 #endif
2184 
2185         error = xfs_qm_init();
2186         if (error)
2187                 goto out_remove_dbg_kobj;
2188 
2189         error = register_filesystem(&xfs_fs_type);
2190         if (error)
2191                 goto out_qm_exit;
2192         return 0;
2193 
2194  out_qm_exit:
2195         xfs_qm_exit();
2196  out_remove_dbg_kobj:
2197 #ifdef DEBUG
2198         xfs_sysfs_del(&xfs_dbg_kobj);
2199  out_remove_stats_kobj:
2200 #endif
2201         xfs_sysfs_del(&xfsstats.xs_kobj);
2202  out_free_stats:
2203         free_percpu(xfsstats.xs_stats);
2204  out_kset_unregister:
2205         kset_unregister(xfs_kset);
2206  out_sysctl_unregister:
2207         xfs_sysctl_unregister();
2208  out_cleanup_procfs:
2209         xfs_cleanup_procfs();
2210  out_buf_terminate:
2211         xfs_buf_terminate();
2212  out_mru_cache_uninit:
2213         xfs_mru_cache_uninit();
2214  out_destroy_wq:
2215         xfs_destroy_workqueues();
2216  out_destroy_zones:
2217         xfs_destroy_zones();
2218  out:
2219         return error;
2220 }
2221 
2222 STATIC void __exit
2223 exit_xfs_fs(void)
2224 {
2225         xfs_qm_exit();
2226         unregister_filesystem(&xfs_fs_type);
2227 #ifdef DEBUG
2228         xfs_sysfs_del(&xfs_dbg_kobj);
2229 #endif
2230         xfs_sysfs_del(&xfsstats.xs_kobj);
2231         free_percpu(xfsstats.xs_stats);
2232         kset_unregister(xfs_kset);
2233         xfs_sysctl_unregister();
2234         xfs_cleanup_procfs();
2235         xfs_buf_terminate();
2236         xfs_mru_cache_uninit();
2237         xfs_destroy_workqueues();
2238         xfs_destroy_zones();
2239         xfs_uuid_table_free();
2240 }
2241 
2242 module_init(init_xfs_fs);
2243 module_exit(exit_xfs_fs);
2244 
2245 MODULE_AUTHOR("Silicon Graphics, Inc.");
2246 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2247 MODULE_LICENSE("GPL");
2248 

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