fs/xfs/xfs_super.c

   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_da_format.h"
  15 #include "xfs_inode.h"
  16 #include "xfs_btree.h"
  17 #include "xfs_bmap.h"
  18 #include "xfs_alloc.h"
  19 #include "xfs_error.h"
  20 #include "xfs_fsops.h"
  21 #include "xfs_trans.h"
  22 #include "xfs_buf_item.h"
  23 #include "xfs_log.h"
  24 #include "xfs_log_priv.h"
  25 #include "xfs_da_btree.h"
  26 #include "xfs_dir2.h"
  27 #include "xfs_extfree_item.h"
  28 #include "xfs_mru_cache.h"
  29 #include "xfs_inode_item.h"
  30 #include "xfs_icache.h"
  31 #include "xfs_trace.h"
  32 #include "xfs_icreate_item.h"
  33 #include "xfs_filestream.h"
  34 #include "xfs_quota.h"
  35 #include "xfs_sysfs.h"
  36 #include "xfs_ondisk.h"
  37 #include "xfs_rmap_item.h"
  38 #include "xfs_refcount_item.h"
  39 #include "xfs_bmap_item.h"
  40 #include "xfs_reflink.h"
  41
  42 #include <linux/namei.h>
  43 #include <linux/dax.h>
  44 #include <linux/init.h>
  45 #include <linux/slab.h>
  46 #include <linux/mount.h>
  47 #include <linux/mempool.h>
  48 #include <linux/writeback.h>
  49 #include <linux/kthread.h>
  50 #include <linux/freezer.h>
  51 #include <linux/parser.h>
  52
  53 static const struct super_operations xfs_super_operations;
  54 struct bio_set xfs_ioend_bioset;
  55
  56 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  57 #ifdef DEBUG
  58 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  59 #endif
  60
  61 /*
  62  * Table driven mount option parser.
  63  */
  64 enum {
  65         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
  66         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  67         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  68         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
  69         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
  70         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
  71         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
  72         Opt_uquota, Opt_gquota, Opt_pquota,
  73         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  74         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
  75 };
  76
  77 static const match_table_t tokens = {
  78         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
  79         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
  80         {Opt_logdev,    "logdev=%s"},   /* log device */
  81         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
  82         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
  83         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
  84         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
  85         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
  86         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
  87         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
  88         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
  89         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
  90         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
  91         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
  92         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
  93         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
  94         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
  95         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
  96         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
  97         {Opt_inode32,   "inode32"},     /* inode allocation limited to
  98                                          * XFS_MAXINUMBER_32 */
  99         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
 100         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
 101         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
 102         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
 103                                          * in stat(). */
 104         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
 105         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
 106         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
 107         {Opt_quota,     "quota"},       /* disk quotas (user) */
 108         {Opt_noquota,   "noquota"},     /* no quotas */
 109         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
 110         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
 111         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
 112         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
 113         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
 114         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
 115         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
 116         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
 117         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
 118         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
 119         {Opt_discard,   "discard"},     /* Discard unused blocks */
 120         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
 121
 122         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
 123
 124         /* Deprecated mount options scheduled for removal */
 125         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
 126                                          * unwritten extent conversion */
 127         {Opt_nobarrier, "nobarrier"},   /* .. disable */
 128
 129         {Opt_err,       NULL},
 130 };
 131
 132
 133 STATIC int
 134 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 135 {
 136         int     last, shift_left_factor = 0, _res;
 137         char    *value;
 138         int     ret = 0;
 139
 140         value = match_strdup(s);
 141         if (!value)
 142                 return -ENOMEM;
 143
 144         last = strlen(value) - 1;
 145         if (value[last] == 'K' || value[last] == 'k') {
 146                 shift_left_factor = 10;
 147                 value[last] = '\0';
 148         }
 149         if (value[last] == 'M' || value[last] == 'm') {
 150                 shift_left_factor = 20;
 151                 value[last] = '\0';
 152         }
 153         if (value[last] == 'G' || value[last] == 'g') {
 154                 shift_left_factor = 30;
 155                 value[last] = '\0';
 156         }
 157
 158         if (kstrtoint(value, base, &_res))
 159                 ret = -EINVAL;
 160         kfree(value);
 161         *res = _res << shift_left_factor;
 162         return ret;
 163 }
 164
 165 /*
 166  * This function fills in xfs_mount_t fields based on mount args.
 167  * Note: the superblock has _not_ yet been read in.
 168  *
 169  * Note that this function leaks the various device name allocations on
 170  * failure.  The caller takes care of them.
 171  *
 172  * *sb is const because this is also used to test options on the remount
 173  * path, and we don't want this to have any side effects at remount time.
 174  * Today this function does not change *sb, but just to future-proof...
 175  */
 176 STATIC int
 177 xfs_parseargs(
 178         struct xfs_mount        *mp,
 179         char                    *options)
 180 {
 181         const struct super_block *sb = mp->m_super;
 182         char                    *p;
 183         substring_t             args[MAX_OPT_ARGS];
 184         int                     dsunit = 0;
 185         int                     dswidth = 0;
 186         int                     iosize = 0;
 187         uint8_t                 iosizelog = 0;
 188
 189         /*
 190          * set up the mount name first so all the errors will refer to the
 191          * correct device.
 192          */
 193         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 194         if (!mp->m_fsname)
 195                 return -ENOMEM;
 196         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 197
 198         /*
 199          * Copy binary VFS mount flags we are interested in.
 200          */
 201         if (sb_rdonly(sb))
 202                 mp->m_flags |= XFS_MOUNT_RDONLY;
 203         if (sb->s_flags & SB_DIRSYNC)
 204                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 205         if (sb->s_flags & SB_SYNCHRONOUS)
 206                 mp->m_flags |= XFS_MOUNT_WSYNC;
 207
 208         /*
 209          * Set some default flags that could be cleared by the mount option
 210          * parsing.
 211          */
 212         mp->m_flags |= XFS_MOUNT_BARRIER;
 213         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 214
 215         /*
 216          * These can be overridden by the mount option parsing.
 217          */
 218         mp->m_logbufs = -1;
 219         mp->m_logbsize = -1;
 220
 221         if (!options)
 222                 goto done;
 223
 224         while ((p = strsep(&options, ",")) != NULL) {
 225                 int             token;
 226
 227                 if (!*p)
 228                         continue;
 229
 230                 token = match_token(p, tokens, args);
 231                 switch (token) {
 232                 case Opt_logbufs:
 233                         if (match_int(args, &mp->m_logbufs))
 234                                 return -EINVAL;
 235                         break;
 236                 case Opt_logbsize:
 237                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
 238                                 return -EINVAL;
 239                         break;
 240                 case Opt_logdev:
 241                         kfree(mp->m_logname);
 242                         mp->m_logname = match_strdup(args);
 243                         if (!mp->m_logname)
 244                                 return -ENOMEM;
 245                         break;
 246                 case Opt_mtpt:
 247                         xfs_warn(mp, "%s option not allowed on this system", p);
 248                         return -EINVAL;
 249                 case Opt_rtdev:
 250                         kfree(mp->m_rtname);
 251                         mp->m_rtname = match_strdup(args);
 252                         if (!mp->m_rtname)
 253                                 return -ENOMEM;
 254                         break;
 255                 case Opt_allocsize:
 256                 case Opt_biosize:
 257                         if (suffix_kstrtoint(args, 10, &iosize))
 258                                 return -EINVAL;
 259                         iosizelog = ffs(iosize) - 1;
 260                         break;
 261                 case Opt_grpid:
 262                 case Opt_bsdgroups:
 263                         mp->m_flags |= XFS_MOUNT_GRPID;
 264                         break;
 265                 case Opt_nogrpid:
 266                 case Opt_sysvgroups:
 267                         mp->m_flags &= ~XFS_MOUNT_GRPID;
 268                         break;
 269                 case Opt_wsync:
 270                         mp->m_flags |= XFS_MOUNT_WSYNC;
 271                         break;
 272                 case Opt_norecovery:
 273                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
 274                         break;
 275                 case Opt_noalign:
 276                         mp->m_flags |= XFS_MOUNT_NOALIGN;
 277                         break;
 278                 case Opt_swalloc:
 279                         mp->m_flags |= XFS_MOUNT_SWALLOC;
 280                         break;
 281                 case Opt_sunit:
 282                         if (match_int(args, &dsunit))
 283                                 return -EINVAL;
 284                         break;
 285                 case Opt_swidth:
 286                         if (match_int(args, &dswidth))
 287                                 return -EINVAL;
 288                         break;
 289                 case Opt_inode32:
 290                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 291                         break;
 292                 case Opt_inode64:
 293                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 294                         break;
 295                 case Opt_nouuid:
 296                         mp->m_flags |= XFS_MOUNT_NOUUID;
 297                         break;
 298                 case Opt_ikeep:
 299                         mp->m_flags |= XFS_MOUNT_IKEEP;
 300                         break;
 301                 case Opt_noikeep:
 302                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
 303                         break;
 304                 case Opt_largeio:
 305                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 306                         break;
 307                 case Opt_nolargeio:
 308                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 309                         break;
 310                 case Opt_attr2:
 311                         mp->m_flags |= XFS_MOUNT_ATTR2;
 312                         break;
 313                 case Opt_noattr2:
 314                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
 315                         mp->m_flags |= XFS_MOUNT_NOATTR2;
 316                         break;
 317                 case Opt_filestreams:
 318                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 319                         break;
 320                 case Opt_noquota:
 321                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 322                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 323                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 324                         break;
 325                 case Opt_quota:
 326                 case Opt_uquota:
 327                 case Opt_usrquota:
 328                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 329                                          XFS_UQUOTA_ENFD);
 330                         break;
 331                 case Opt_qnoenforce:
 332                 case Opt_uqnoenforce:
 333                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 334                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 335                         break;
 336                 case Opt_pquota:
 337                 case Opt_prjquota:
 338                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 339                                          XFS_PQUOTA_ENFD);
 340                         break;
 341                 case Opt_pqnoenforce:
 342                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 343                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
 344                         break;
 345                 case Opt_gquota:
 346                 case Opt_grpquota:
 347                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 348                                          XFS_GQUOTA_ENFD);
 349                         break;
 350                 case Opt_gqnoenforce:
 351                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 352                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
 353                         break;
 354                 case Opt_discard:
 355                         mp->m_flags |= XFS_MOUNT_DISCARD;
 356                         break;
 357                 case Opt_nodiscard:
 358                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
 359                         break;
 360 #ifdef CONFIG_FS_DAX
 361                 case Opt_dax:
 362                         mp->m_flags |= XFS_MOUNT_DAX;
 363                         break;
 364 #endif
 365                 case Opt_barrier:
 366                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
 367                         mp->m_flags |= XFS_MOUNT_BARRIER;
 368                         break;
 369                 case Opt_nobarrier:
 370                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
 371                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
 372                         break;
 373                 default:
 374                         xfs_warn(mp, "unknown mount option [%s].", p);
 375                         return -EINVAL;
 376                 }
 377         }
 378
 379         /*
 380          * no recovery flag requires a read-only mount
 381          */
 382         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 383             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 384                 xfs_warn(mp, "no-recovery mounts must be read-only.");
 385                 return -EINVAL;
 386         }
 387
 388         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
 389                 xfs_warn(mp,
 390         "sunit and swidth options incompatible with the noalign option");
 391                 return -EINVAL;
 392         }
 393
 394 #ifndef CONFIG_XFS_QUOTA
 395         if (XFS_IS_QUOTA_RUNNING(mp)) {
 396                 xfs_warn(mp, "quota support not available in this kernel.");
 397                 return -EINVAL;
 398         }
 399 #endif
 400
 401         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 402                 xfs_warn(mp, "sunit and swidth must be specified together");
 403                 return -EINVAL;
 404         }
 405
 406         if (dsunit && (dswidth % dsunit != 0)) {
 407                 xfs_warn(mp,
 408         "stripe width (%d) must be a multiple of the stripe unit (%d)",
 409                         dswidth, dsunit);
 410                 return -EINVAL;
 411         }
 412
 413 done:
 414         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
 415                 /*
 416                  * At this point the superblock has not been read
 417                  * in, therefore we do not know the block size.
 418                  * Before the mount call ends we will convert
 419                  * these to FSBs.
 420                  */
 421                 mp->m_dalign = dsunit;
 422                 mp->m_swidth = dswidth;
 423         }
 424
 425         if (mp->m_logbufs != -1 &&
 426             mp->m_logbufs != 0 &&
 427             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 428              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 429                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 430                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 431                 return -EINVAL;
 432         }
 433         if (mp->m_logbsize != -1 &&
 434             mp->m_logbsize !=  0 &&
 435             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 436              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 437              !is_power_of_2(mp->m_logbsize))) {
 438                 xfs_warn(mp,
 439                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 440                         mp->m_logbsize);
 441                 return -EINVAL;
 442         }
 443
 444         if (iosizelog) {
 445                 if (iosizelog > XFS_MAX_IO_LOG ||
 446                     iosizelog < XFS_MIN_IO_LOG) {
 447                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 448                                 iosizelog, XFS_MIN_IO_LOG,
 449                                 XFS_MAX_IO_LOG);
 450                         return -EINVAL;
 451                 }
 452
 453                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 454                 mp->m_readio_log = iosizelog;
 455                 mp->m_writeio_log = iosizelog;
 456         }
 457
 458         return 0;
 459 }
 460
 461 struct proc_xfs_info {
 462         uint64_t        flag;
 463         char            *str;
 464 };
 465
 466 STATIC int
 467 xfs_showargs(
 468         struct xfs_mount        *mp,
 469         struct seq_file         *m)
 470 {
 471         static struct proc_xfs_info xfs_info_set[] = {
 472                 /* the few simple ones we can get from the mount struct */
 473                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 474                 { XFS_MOUNT_WSYNC,              ",wsync" },
 475                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 476                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 477                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 478                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 479                 { XFS_MOUNT_ATTR2,              ",attr2" },
 480                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 481                 { XFS_MOUNT_GRPID,              ",grpid" },
 482                 { XFS_MOUNT_DISCARD,            ",discard" },
 483                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
 484                 { XFS_MOUNT_DAX,                ",dax" },
 485                 { 0, NULL }
 486         };
 487         static struct proc_xfs_info xfs_info_unset[] = {
 488                 /* the few simple ones we can get from the mount struct */
 489                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
 490                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
 491                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
 492                 { 0, NULL }
 493         };
 494         struct proc_xfs_info    *xfs_infop;
 495
 496         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 497                 if (mp->m_flags & xfs_infop->flag)
 498                         seq_puts(m, xfs_infop->str);
 499         }
 500         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 501                 if (!(mp->m_flags & xfs_infop->flag))
 502                         seq_puts(m, xfs_infop->str);
 503         }
 504
 505         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 506                 seq_printf(m, ",allocsize=%dk",
 507                                 (int)(1 << mp->m_writeio_log) >> 10);
 508
 509         if (mp->m_logbufs > 0)
 510                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 511         if (mp->m_logbsize > 0)
 512                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 513
 514         if (mp->m_logname)
 515                 seq_show_option(m, "logdev", mp->m_logname);
 516         if (mp->m_rtname)
 517                 seq_show_option(m, "rtdev", mp->m_rtname);
 518
 519         if (mp->m_dalign > 0)
 520                 seq_printf(m, ",sunit=%d",
 521                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 522         if (mp->m_swidth > 0)
 523                 seq_printf(m, ",swidth=%d",
 524                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 525
 526         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 527                 seq_puts(m, ",usrquota");
 528         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 529                 seq_puts(m, ",uqnoenforce");
 530
 531         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 532                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 533                         seq_puts(m, ",prjquota");
 534                 else
 535                         seq_puts(m, ",pqnoenforce");
 536         }
 537         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 538                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 539                         seq_puts(m, ",grpquota");
 540                 else
 541                         seq_puts(m, ",gqnoenforce");
 542         }
 543
 544         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 545                 seq_puts(m, ",noquota");
 546
 547         return 0;
 548 }
 549 static uint64_t
 550 xfs_max_file_offset(
 551         unsigned int            blockshift)
 552 {
 553         unsigned int            pagefactor = 1;
 554         unsigned int            bitshift = BITS_PER_LONG - 1;
 555
 556         /* Figure out maximum filesize, on Linux this can depend on
 557          * the filesystem blocksize (on 32 bit platforms).
 558          * __block_write_begin does this in an [unsigned] long...
 559          *      page->index << (PAGE_SHIFT - bbits)
 560          * So, for page sized blocks (4K on 32 bit platforms),
 561          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 562          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
 563          * but for smaller blocksizes it is less (bbits = log2 bsize).
 564          * Note1: get_block_t takes a long (implicit cast from above)
 565          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 566          * can optionally convert the [unsigned] long from above into
 567          * an [unsigned] long long.
 568          */
 569
 570 #if BITS_PER_LONG == 32
 571 # if defined(CONFIG_LBDAF)
 572         ASSERT(sizeof(sector_t) == 8);
 573         pagefactor = PAGE_SIZE;
 574         bitshift = BITS_PER_LONG;
 575 # else
 576         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
 577 # endif
 578 #endif
 579
 580         return (((uint64_t)pagefactor) << bitshift) - 1;
 581 }
 582
 583 /*
 584  * Set parameters for inode allocation heuristics, taking into account
 585  * filesystem size and inode32/inode64 mount options; i.e. specifically
 586  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 587  *
 588  * Inode allocation patterns are altered only if inode32 is requested
 589  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 590  * If altered, XFS_MOUNT_32BITINODES is set as well.
 591  *
 592  * An agcount independent of that in the mount structure is provided
 593  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 594  * to the potentially higher ag count.
 595  *
 596  * Returns the maximum AG index which may contain inodes.
 597  */
 598 xfs_agnumber_t
 599 xfs_set_inode_alloc(
 600         struct xfs_mount *mp,
 601         xfs_agnumber_t  agcount)
 602 {
 603         xfs_agnumber_t  index;
 604         xfs_agnumber_t  maxagi = 0;
 605         xfs_sb_t        *sbp = &mp->m_sb;
 606         xfs_agnumber_t  max_metadata;
 607         xfs_agino_t     agino;
 608         xfs_ino_t       ino;
 609
 610         /*
 611          * Calculate how much should be reserved for inodes to meet
 612          * the max inode percentage.  Used only for inode32.
 613          */
 614         if (mp->m_maxicount) {
 615                 uint64_t        icount;
 616
 617                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 618                 do_div(icount, 100);
 619                 icount += sbp->sb_agblocks - 1;
 620                 do_div(icount, sbp->sb_agblocks);
 621                 max_metadata = icount;
 622         } else {
 623                 max_metadata = agcount;
 624         }
 625
 626         /* Get the last possible inode in the filesystem */
 627         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
 628         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 629
 630         /*
 631          * If user asked for no more than 32-bit inodes, and the fs is
 632          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 633          * the allocator to accommodate the request.
 634          */
 635         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 636                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 637         else
 638                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 639
 640         for (index = 0; index < agcount; index++) {
 641                 struct xfs_perag        *pag;
 642
 643                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 644
 645                 pag = xfs_perag_get(mp, index);
 646
 647                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 648                         if (ino > XFS_MAXINUMBER_32) {
 649                                 pag->pagi_inodeok = 0;
 650                                 pag->pagf_metadata = 0;
 651                         } else {
 652                                 pag->pagi_inodeok = 1;
 653                                 maxagi++;
 654                                 if (index < max_metadata)
 655                                         pag->pagf_metadata = 1;
 656                                 else
 657                                         pag->pagf_metadata = 0;
 658                         }
 659                 } else {
 660                         pag->pagi_inodeok = 1;
 661                         pag->pagf_metadata = 0;
 662                 }
 663
 664                 xfs_perag_put(pag);
 665         }
 666
 667         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 668 }
 669
 670 STATIC int
 671 xfs_blkdev_get(
 672         xfs_mount_t             *mp,
 673         const char              *name,
 674         struct block_device     **bdevp)
 675 {
 676         int                     error = 0;
 677
 678         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 679                                     mp);
 680         if (IS_ERR(*bdevp)) {
 681                 error = PTR_ERR(*bdevp);
 682                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 683         }
 684
 685         return error;
 686 }
 687
 688 STATIC void
 689 xfs_blkdev_put(
 690         struct block_device     *bdev)
 691 {
 692         if (bdev)
 693                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 694 }
 695
 696 void
 697 xfs_blkdev_issue_flush(
 698         xfs_buftarg_t           *buftarg)
 699 {
 700         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 701 }
 702
 703 STATIC void
 704 xfs_close_devices(
 705         struct xfs_mount        *mp)
 706 {
 707         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 708
 709         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 710                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 711                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 712
 713                 xfs_free_buftarg(mp->m_logdev_targp);
 714                 xfs_blkdev_put(logdev);
 715                 fs_put_dax(dax_logdev);
 716         }
 717         if (mp->m_rtdev_targp) {
 718                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 719                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 720
 721                 xfs_free_buftarg(mp->m_rtdev_targp);
 722                 xfs_blkdev_put(rtdev);
 723                 fs_put_dax(dax_rtdev);
 724         }
 725         xfs_free_buftarg(mp->m_ddev_targp);
 726         fs_put_dax(dax_ddev);
 727 }
 728
 729 /*
 730  * The file system configurations are:
 731  *      (1) device (partition) with data and internal log
 732  *      (2) logical volume with data and log subvolumes.
 733  *      (3) logical volume with data, log, and realtime subvolumes.
 734  *
 735  * We only have to handle opening the log and realtime volumes here if
 736  * they are present.  The data subvolume has already been opened by
 737  * get_sb_bdev() and is stored in sb->s_bdev.
 738  */
 739 STATIC int
 740 xfs_open_devices(
 741         struct xfs_mount        *mp)
 742 {
 743         struct block_device     *ddev = mp->m_super->s_bdev;
 744         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 745         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 746         struct block_device     *logdev = NULL, *rtdev = NULL;
 747         int                     error;
 748
 749         /*
 750          * Open real time and log devices - order is important.
 751          */
 752         if (mp->m_logname) {
 753                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 754                 if (error)
 755                         goto out;
 756                 dax_logdev = fs_dax_get_by_bdev(logdev);
 757         }
 758
 759         if (mp->m_rtname) {
 760                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 761                 if (error)
 762                         goto out_close_logdev;
 763
 764                 if (rtdev == ddev || rtdev == logdev) {
 765                         xfs_warn(mp,
 766         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 767                         error = -EINVAL;
 768                         goto out_close_rtdev;
 769                 }
 770                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 771         }
 772
 773         /*
 774          * Setup xfs_mount buffer target pointers
 775          */
 776         error = -ENOMEM;
 777         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 778         if (!mp->m_ddev_targp)
 779                 goto out_close_rtdev;
 780
 781         if (rtdev) {
 782                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 783                 if (!mp->m_rtdev_targp)
 784                         goto out_free_ddev_targ;
 785         }
 786
 787         if (logdev && logdev != ddev) {
 788                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 789                 if (!mp->m_logdev_targp)
 790                         goto out_free_rtdev_targ;
 791         } else {
 792                 mp->m_logdev_targp = mp->m_ddev_targp;
 793         }
 794
 795         return 0;
 796
 797  out_free_rtdev_targ:
 798         if (mp->m_rtdev_targp)
 799                 xfs_free_buftarg(mp->m_rtdev_targp);
 800  out_free_ddev_targ:
 801         xfs_free_buftarg(mp->m_ddev_targp);
 802  out_close_rtdev:
 803         xfs_blkdev_put(rtdev);
 804         fs_put_dax(dax_rtdev);
 805  out_close_logdev:
 806         if (logdev && logdev != ddev) {
 807                 xfs_blkdev_put(logdev);
 808                 fs_put_dax(dax_logdev);
 809         }
 810  out:
 811         fs_put_dax(dax_ddev);
 812         return error;
 813 }
 814
 815 /*
 816  * Setup xfs_mount buffer target pointers based on superblock
 817  */
 818 STATIC int
 819 xfs_setup_devices(
 820         struct xfs_mount        *mp)
 821 {
 822         int                     error;
 823
 824         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 825         if (error)
 826                 return error;
 827
 828         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 829                 unsigned int    log_sector_size = BBSIZE;
 830
 831                 if (xfs_sb_version_hassector(&mp->m_sb))
 832                         log_sector_size = mp->m_sb.sb_logsectsize;
 833                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 834                                             log_sector_size);
 835                 if (error)
 836                         return error;
 837         }
 838         if (mp->m_rtdev_targp) {
 839                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 840                                             mp->m_sb.sb_sectsize);
 841                 if (error)
 842                         return error;
 843         }
 844
 845         return 0;
 846 }
 847
 848 STATIC int
 849 xfs_init_mount_workqueues(
 850         struct xfs_mount        *mp)
 851 {
 852         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 853                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
 854         if (!mp->m_buf_workqueue)
 855                 goto out;
 856
 857         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
 858                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 859         if (!mp->m_data_workqueue)
 860                 goto out_destroy_buf;
 861
 862         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 863                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 864         if (!mp->m_unwritten_workqueue)
 865                 goto out_destroy_data_iodone_queue;
 866
 867         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 868                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 869         if (!mp->m_cil_workqueue)
 870                 goto out_destroy_unwritten;
 871
 872         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 873                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 874         if (!mp->m_reclaim_workqueue)
 875                 goto out_destroy_cil;
 876
 877         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
 878                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
 879                         mp->m_fsname);
 880         if (!mp->m_log_workqueue)
 881                 goto out_destroy_reclaim;
 882
 883         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 884                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 885         if (!mp->m_eofblocks_workqueue)
 886                 goto out_destroy_log;
 887
 888         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 889                                                mp->m_fsname);
 890         if (!mp->m_sync_workqueue)
 891                 goto out_destroy_eofb;
 892
 893         return 0;
 894
 895 out_destroy_eofb:
 896         destroy_workqueue(mp->m_eofblocks_workqueue);
 897 out_destroy_log:
 898         destroy_workqueue(mp->m_log_workqueue);
 899 out_destroy_reclaim:
 900         destroy_workqueue(mp->m_reclaim_workqueue);
 901 out_destroy_cil:
 902         destroy_workqueue(mp->m_cil_workqueue);
 903 out_destroy_unwritten:
 904         destroy_workqueue(mp->m_unwritten_workqueue);
 905 out_destroy_data_iodone_queue:
 906         destroy_workqueue(mp->m_data_workqueue);
 907 out_destroy_buf:
 908         destroy_workqueue(mp->m_buf_workqueue);
 909 out:
 910         return -ENOMEM;
 911 }
 912
 913 STATIC void
 914 xfs_destroy_mount_workqueues(
 915         struct xfs_mount        *mp)
 916 {
 917         destroy_workqueue(mp->m_sync_workqueue);
 918         destroy_workqueue(mp->m_eofblocks_workqueue);
 919         destroy_workqueue(mp->m_log_workqueue);
 920         destroy_workqueue(mp->m_reclaim_workqueue);
 921         destroy_workqueue(mp->m_cil_workqueue);
 922         destroy_workqueue(mp->m_data_workqueue);
 923         destroy_workqueue(mp->m_unwritten_workqueue);
 924         destroy_workqueue(mp->m_buf_workqueue);
 925 }
 926
 927 /*
 928  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 929  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 930  * for IO to complete so that we effectively throttle multiple callers to the
 931  * rate at which IO is completing.
 932  */
 933 void
 934 xfs_flush_inodes(
 935         struct xfs_mount        *mp)
 936 {
 937         struct super_block      *sb = mp->m_super;
 938
 939         if (down_read_trylock(&sb->s_umount)) {
 940                 sync_inodes_sb(sb);
 941                 up_read(&sb->s_umount);
 942         }
 943 }
 944
 945 /* Catch misguided souls that try to use this interface on XFS */
 946 STATIC struct inode *
 947 xfs_fs_alloc_inode(
 948         struct super_block      *sb)
 949 {
 950         BUG();
 951         return NULL;
 952 }
 953
 954 /*
 955  * Now that the generic code is guaranteed not to be accessing
 956  * the linux inode, we can inactivate and reclaim the inode.
 957  */
 958 STATIC void
 959 xfs_fs_destroy_inode(
 960         struct inode            *inode)
 961 {
 962         struct xfs_inode        *ip = XFS_I(inode);
 963
 964         trace_xfs_destroy_inode(ip);
 965
 966         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 967         XFS_STATS_INC(ip->i_mount, vn_rele);
 968         XFS_STATS_INC(ip->i_mount, vn_remove);
 969
 970         xfs_inactive(ip);
 971
 972         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
 973         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 974
 975         /*
 976          * We should never get here with one of the reclaim flags already set.
 977          */
 978         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 979         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 980
 981         /*
 982          * We always use background reclaim here because even if the
 983          * inode is clean, it still may be under IO and hence we have
 984          * to take the flush lock. The background reclaim path handles
 985          * this more efficiently than we can here, so simply let background
 986          * reclaim tear down all inodes.
 987          */
 988         xfs_inode_set_reclaim_tag(ip);
 989 }
 990
 991 static void
 992 xfs_fs_dirty_inode(
 993         struct inode                    *inode,
 994         int                             flag)
 995 {
 996         struct xfs_inode                *ip = XFS_I(inode);
 997         struct xfs_mount                *mp = ip->i_mount;
 998         struct xfs_trans                *tp;
 999
1000         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
1001                 return;
1002         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
1003                 return;
1004
1005         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
1006                 return;
1007         xfs_ilock(ip, XFS_ILOCK_EXCL);
1008         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1009         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
1010         xfs_trans_commit(tp);
1011 }
1012
1013 /*
1014  * Slab object creation initialisation for the XFS inode.
1015  * This covers only the idempotent fields in the XFS inode;
1016  * all other fields need to be initialised on allocation
1017  * from the slab. This avoids the need to repeatedly initialise
1018  * fields in the xfs inode that left in the initialise state
1019  * when freeing the inode.
1020  */
1021 STATIC void
1022 xfs_fs_inode_init_once(
1023         void                    *inode)
1024 {
1025         struct xfs_inode        *ip = inode;
1026
1027         memset(ip, 0, sizeof(struct xfs_inode));
1028
1029         /* vfs inode */
1030         inode_init_once(VFS_I(ip));
1031
1032         /* xfs inode */
1033         atomic_set(&ip->i_pincount, 0);
1034         spin_lock_init(&ip->i_flags_lock);
1035
1036         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1037                      "xfsino", ip->i_ino);
1038         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1039                      "xfsino", ip->i_ino);
1040 }
1041
1042 /*
1043  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1044  * serialised against cache hits here via the inode->i_lock and igrab() in
1045  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1046  * racing with us, and it avoids needing to grab a spinlock here for every inode
1047  * we drop the final reference on.
1048  */
1049 STATIC int
1050 xfs_fs_drop_inode(
1051         struct inode            *inode)
1052 {
1053         struct xfs_inode        *ip = XFS_I(inode);
1054
1055         /*
1056          * If this unlinked inode is in the middle of recovery, don't
1057          * drop the inode just yet; log recovery will take care of
1058          * that.  See the comment for this inode flag.
1059          */
1060         if (ip->i_flags & XFS_IRECOVERY) {
1061                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1062                 return 0;
1063         }
1064
1065         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1066 }
1067
1068 STATIC void
1069 xfs_free_fsname(
1070         struct xfs_mount        *mp)
1071 {
1072         kfree(mp->m_fsname);
1073         kfree(mp->m_rtname);
1074         kfree(mp->m_logname);
1075 }
1076
1077 STATIC int
1078 xfs_fs_sync_fs(
1079         struct super_block      *sb,
1080         int                     wait)
1081 {
1082         struct xfs_mount        *mp = XFS_M(sb);
1083
1084         /*
1085          * Doing anything during the async pass would be counterproductive.
1086          */
1087         if (!wait)
1088                 return 0;
1089
1090         xfs_log_force(mp, XFS_LOG_SYNC);
1091         if (laptop_mode) {
1092                 /*
1093                  * The disk must be active because we're syncing.
1094                  * We schedule log work now (now that the disk is
1095                  * active) instead of later (when it might not be).
1096                  */
1097                 flush_delayed_work(&mp->m_log->l_work);
1098         }
1099
1100         return 0;
1101 }
1102
1103 STATIC int
1104 xfs_fs_statfs(
1105         struct dentry           *dentry,
1106         struct kstatfs          *statp)
1107 {
1108         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1109         xfs_sb_t                *sbp = &mp->m_sb;
1110         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1111         uint64_t                fakeinos, id;
1112         uint64_t                icount;
1113         uint64_t                ifree;
1114         uint64_t                fdblocks;
1115         xfs_extlen_t            lsize;
1116         int64_t                 ffree;
1117
1118         statp->f_type = XFS_SB_MAGIC;
1119         statp->f_namelen = MAXNAMELEN - 1;
1120
1121         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1122         statp->f_fsid.val[0] = (u32)id;
1123         statp->f_fsid.val[1] = (u32)(id >> 32);
1124
1125         icount = percpu_counter_sum(&mp->m_icount);
1126         ifree = percpu_counter_sum(&mp->m_ifree);
1127         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1128
1129         spin_lock(&mp->m_sb_lock);
1130         statp->f_bsize = sbp->sb_blocksize;
1131         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1132         statp->f_blocks = sbp->sb_dblocks - lsize;
1133         spin_unlock(&mp->m_sb_lock);
1134
1135         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1136         statp->f_bavail = statp->f_bfree;
1137
1138         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1139         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
1140         if (mp->m_maxicount)
1141                 statp->f_files = min_t(typeof(statp->f_files),
1142                                         statp->f_files,
1143                                         mp->m_maxicount);
1144
1145         /* If sb_icount overshot maxicount, report actual allocation */
1146         statp->f_files = max_t(typeof(statp->f_files),
1147                                         statp->f_files,
1148                                         sbp->sb_icount);
1149
1150         /* make sure statp->f_ffree does not underflow */
1151         ffree = statp->f_files - (icount - ifree);
1152         statp->f_ffree = max_t(int64_t, ffree, 0);
1153
1154
1155         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1156             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1157                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1158                 xfs_qm_statvfs(ip, statp);
1159
1160         if (XFS_IS_REALTIME_MOUNT(mp) &&
1161             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
1162                 statp->f_blocks = sbp->sb_rblocks;
1163                 statp->f_bavail = statp->f_bfree =
1164                         sbp->sb_frextents * sbp->sb_rextsize;
1165         }
1166
1167         return 0;
1168 }
1169
1170 STATIC void
1171 xfs_save_resvblks(struct xfs_mount *mp)
1172 {
1173         uint64_t resblks = 0;
1174
1175         mp->m_resblks_save = mp->m_resblks;
1176         xfs_reserve_blocks(mp, &resblks, NULL);
1177 }
1178
1179 STATIC void
1180 xfs_restore_resvblks(struct xfs_mount *mp)
1181 {
1182         uint64_t resblks;
1183
1184         if (mp->m_resblks_save) {
1185                 resblks = mp->m_resblks_save;
1186                 mp->m_resblks_save = 0;
1187         } else
1188                 resblks = xfs_default_resblks(mp);
1189
1190         xfs_reserve_blocks(mp, &resblks, NULL);
1191 }
1192
1193 /*
1194  * Trigger writeback of all the dirty metadata in the file system.
1195  *
1196  * This ensures that the metadata is written to their location on disk rather
1197  * than just existing in transactions in the log. This means after a quiesce
1198  * there is no log replay required to write the inodes to disk - this is the
1199  * primary difference between a sync and a quiesce.
1200  *
1201  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1202  * it is started again when appropriate.
1203  */
1204 void
1205 xfs_quiesce_attr(
1206         struct xfs_mount        *mp)
1207 {
1208         int     error = 0;
1209
1210         /* wait for all modifications to complete */
1211         while (atomic_read(&mp->m_active_trans) > 0)
1212                 delay(100);
1213
1214         /* force the log to unpin objects from the now complete transactions */
1215         xfs_log_force(mp, XFS_LOG_SYNC);
1216
1217         /* reclaim inodes to do any IO before the freeze completes */
1218         xfs_reclaim_inodes(mp, 0);
1219         xfs_reclaim_inodes(mp, SYNC_WAIT);
1220
1221         /* Push the superblock and write an unmount record */
1222         error = xfs_log_sbcount(mp);
1223         if (error)
1224                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1225                                 "Frozen image may not be consistent.");
1226         /*
1227          * Just warn here till VFS can correctly support
1228          * read-only remount without racing.
1229          */
1230         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1231
1232         xfs_log_quiesce(mp);
1233 }
1234
1235 STATIC int
1236 xfs_test_remount_options(
1237         struct super_block      *sb,
1238         char                    *options)
1239 {
1240         int                     error = 0;
1241         struct xfs_mount        *tmp_mp;
1242
1243         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1244         if (!tmp_mp)
1245                 return -ENOMEM;
1246
1247         tmp_mp->m_super = sb;
1248         error = xfs_parseargs(tmp_mp, options);
1249         xfs_free_fsname(tmp_mp);
1250         kmem_free(tmp_mp);
1251
1252         return error;
1253 }
1254
1255 STATIC int
1256 xfs_fs_remount(
1257         struct super_block      *sb,
1258         int                     *flags,
1259         char                    *options)
1260 {
1261         struct xfs_mount        *mp = XFS_M(sb);
1262         xfs_sb_t                *sbp = &mp->m_sb;
1263         substring_t             args[MAX_OPT_ARGS];
1264         char                    *p;
1265         int                     error;
1266
1267         /* First, check for complete junk; i.e. invalid options */
1268         error = xfs_test_remount_options(sb, options);
1269         if (error)
1270                 return error;
1271
1272         sync_filesystem(sb);
1273         while ((p = strsep(&options, ",")) != NULL) {
1274                 int token;
1275
1276                 if (!*p)
1277                         continue;
1278
1279                 token = match_token(p, tokens, args);
1280                 switch (token) {
1281                 case Opt_barrier:
1282                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1283                         mp->m_flags |= XFS_MOUNT_BARRIER;
1284                         break;
1285                 case Opt_nobarrier:
1286                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1287                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1288                         break;
1289                 case Opt_inode64:
1290                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1291                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1292                         break;
1293                 case Opt_inode32:
1294                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1295                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1296                         break;
1297                 default:
1298                         /*
1299                          * Logically we would return an error here to prevent
1300                          * users from believing they might have changed
1301                          * mount options using remount which can't be changed.
1302                          *
1303                          * But unfortunately mount(8) adds all options from
1304                          * mtab and fstab to the mount arguments in some cases
1305                          * so we can't blindly reject options, but have to
1306                          * check for each specified option if it actually
1307                          * differs from the currently set option and only
1308                          * reject it if that's the case.
1309                          *
1310                          * Until that is implemented we return success for
1311                          * every remount request, and silently ignore all
1312                          * options that we can't actually change.
1313                          */
1314 #if 0
1315                         xfs_info(mp,
1316                 "mount option \"%s\" not supported for remount", p);
1317                         return -EINVAL;
1318 #else
1319                         break;
1320 #endif
1321                 }
1322         }
1323
1324         /* ro -> rw */
1325         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) {
1326                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1327                         xfs_warn(mp,
1328                 "ro->rw transition prohibited on norecovery mount");
1329                         return -EINVAL;
1330                 }
1331
1332                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1333                     xfs_sb_has_ro_compat_feature(sbp,
1334                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1335                         xfs_warn(mp,
1336 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1337                                 (sbp->sb_features_ro_compat &
1338                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1339                         return -EINVAL;
1340                 }
1341
1342                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1343
1344                 /*
1345                  * If this is the first remount to writeable state we
1346                  * might have some superblock changes to update.
1347                  */
1348                 if (mp->m_update_sb) {
1349                         error = xfs_sync_sb(mp, false);
1350                         if (error) {
1351                                 xfs_warn(mp, "failed to write sb changes");
1352                                 return error;
1353                         }
1354                         mp->m_update_sb = false;
1355                 }
1356
1357                 /*
1358                  * Fill out the reserve pool if it is empty. Use the stashed
1359                  * value if it is non-zero, otherwise go with the default.
1360                  */
1361                 xfs_restore_resvblks(mp);
1362                 xfs_log_work_queue(mp);
1363
1364                 /* Recover any CoW blocks that never got remapped. */
1365                 error = xfs_reflink_recover_cow(mp);
1366                 if (error) {
1367                         xfs_err(mp,
1368         "Error %d recovering leftover CoW allocations.", error);
1369                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1370                         return error;
1371                 }
1372                 xfs_icache_enable_reclaim(mp);
1373
1374                 /* Create the per-AG metadata reservation pool .*/
1375                 error = xfs_fs_reserve_ag_blocks(mp);
1376                 if (error && error != -ENOSPC)
1377                         return error;
1378         }
1379
1380         /* rw -> ro */
1381         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) {
1382                 /*
1383                  * Cancel background eofb scanning so it cannot race with the
1384                  * final log force+buftarg wait and deadlock the remount.
1385                  */
1386                 xfs_icache_disable_reclaim(mp);
1387
1388                 /* Get rid of any leftover CoW reservations... */
1389                 error = xfs_icache_free_cowblocks(mp, NULL);
1390                 if (error) {
1391                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1392                         return error;
1393                 }
1394
1395                 /* Free the per-AG metadata reservation pool. */
1396                 error = xfs_fs_unreserve_ag_blocks(mp);
1397                 if (error) {
1398                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1399                         return error;
1400                 }
1401
1402                 /*
1403                  * Before we sync the metadata, we need to free up the reserve
1404                  * block pool so that the used block count in the superblock on
1405                  * disk is correct at the end of the remount. Stash the current
1406                  * reserve pool size so that if we get remounted rw, we can
1407                  * return it to the same size.
1408                  */
1409                 xfs_save_resvblks(mp);
1410
1411                 xfs_quiesce_attr(mp);
1412                 mp->m_flags |= XFS_MOUNT_RDONLY;
1413         }
1414
1415         return 0;
1416 }
1417
1418 /*
1419  * Second stage of a freeze. The data is already frozen so we only
1420  * need to take care of the metadata. Once that's done sync the superblock
1421  * to the log to dirty it in case of a crash while frozen. This ensures that we
1422  * will recover the unlinked inode lists on the next mount.
1423  */
1424 STATIC int
1425 xfs_fs_freeze(
1426         struct super_block      *sb)
1427 {
1428         struct xfs_mount        *mp = XFS_M(sb);
1429
1430         xfs_icache_disable_reclaim(mp);
1431         xfs_save_resvblks(mp);
1432         xfs_quiesce_attr(mp);
1433         return xfs_sync_sb(mp, true);
1434 }
1435
1436 STATIC int
1437 xfs_fs_unfreeze(
1438         struct super_block      *sb)
1439 {
1440         struct xfs_mount        *mp = XFS_M(sb);
1441
1442         xfs_restore_resvblks(mp);
1443         xfs_log_work_queue(mp);
1444         xfs_icache_enable_reclaim(mp);
1445         return 0;
1446 }
1447
1448 STATIC int
1449 xfs_fs_show_options(
1450         struct seq_file         *m,
1451         struct dentry           *root)
1452 {
1453         return xfs_showargs(XFS_M(root->d_sb), m);
1454 }
1455
1456 /*
1457  * This function fills in xfs_mount_t fields based on mount args.
1458  * Note: the superblock _has_ now been read in.
1459  */
1460 STATIC int
1461 xfs_finish_flags(
1462         struct xfs_mount        *mp)
1463 {
1464         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1465
1466         /* Fail a mount where the logbuf is smaller than the log stripe */
1467         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1468                 if (mp->m_logbsize <= 0 &&
1469                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1470                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1471                 } else if (mp->m_logbsize > 0 &&
1472                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1473                         xfs_warn(mp,
1474                 "logbuf size must be greater than or equal to log stripe size");
1475                         return -EINVAL;
1476                 }
1477         } else {
1478                 /* Fail a mount if the logbuf is larger than 32K */
1479                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1480                         xfs_warn(mp,
1481                 "logbuf size for version 1 logs must be 16K or 32K");
1482                         return -EINVAL;
1483                 }
1484         }
1485
1486         /*
1487          * V5 filesystems always use attr2 format for attributes.
1488          */
1489         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1490             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1491                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1492                              "attr2 is always enabled for V5 filesystems.");
1493                 return -EINVAL;
1494         }
1495
1496         /*
1497          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1498          * told by noattr2 to turn it off
1499          */
1500         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1501             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1502                 mp->m_flags |= XFS_MOUNT_ATTR2;
1503
1504         /*
1505          * prohibit r/w mounts of read-only filesystems
1506          */
1507         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1508                 xfs_warn(mp,
1509                         "cannot mount a read-only filesystem as read-write");
1510                 return -EROFS;
1511         }
1512
1513         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1514             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1515             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1516                 xfs_warn(mp,
1517                   "Super block does not support project and group quota together");
1518                 return -EINVAL;
1519         }
1520
1521         return 0;
1522 }
1523
1524 static int
1525 xfs_init_percpu_counters(
1526         struct xfs_mount        *mp)
1527 {
1528         int             error;
1529
1530         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1531         if (error)
1532                 return -ENOMEM;
1533
1534         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1535         if (error)
1536                 goto free_icount;
1537
1538         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1539         if (error)
1540                 goto free_ifree;
1541
1542         return 0;
1543
1544 free_ifree:
1545         percpu_counter_destroy(&mp->m_ifree);
1546 free_icount:
1547         percpu_counter_destroy(&mp->m_icount);
1548         return -ENOMEM;
1549 }
1550
1551 void
1552 xfs_reinit_percpu_counters(
1553         struct xfs_mount        *mp)
1554 {
1555         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1556         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1557         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1558 }
1559
1560 static void
1561 xfs_destroy_percpu_counters(
1562         struct xfs_mount        *mp)
1563 {
1564         percpu_counter_destroy(&mp->m_icount);
1565         percpu_counter_destroy(&mp->m_ifree);
1566         percpu_counter_destroy(&mp->m_fdblocks);
1567 }
1568
1569 static struct xfs_mount *
1570 xfs_mount_alloc(
1571         struct super_block      *sb)
1572 {
1573         struct xfs_mount        *mp;
1574
1575         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1576         if (!mp)
1577                 return NULL;
1578
1579         mp->m_super = sb;
1580         spin_lock_init(&mp->m_sb_lock);
1581         spin_lock_init(&mp->m_agirotor_lock);
1582         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1583         spin_lock_init(&mp->m_perag_lock);
1584         mutex_init(&mp->m_growlock);
1585         atomic_set(&mp->m_active_trans, 0);
1586         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1587         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1588         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1589         mp->m_kobj.kobject.kset = xfs_kset;
1590         return mp;
1591 }
1592
1593
1594 STATIC int
1595 xfs_fs_fill_super(
1596         struct super_block      *sb,
1597         void                    *data,
1598         int                     silent)
1599 {
1600         struct inode            *root;
1601         struct xfs_mount        *mp = NULL;
1602         int                     flags = 0, error = -ENOMEM;
1603
1604         /*
1605          * allocate mp and do all low-level struct initializations before we
1606          * attach it to the super
1607          */
1608         mp = xfs_mount_alloc(sb);
1609         if (!mp)
1610                 goto out;
1611         sb->s_fs_info = mp;
1612
1613         error = xfs_parseargs(mp, (char *)data);
1614         if (error)
1615                 goto out_free_fsname;
1616
1617         sb_min_blocksize(sb, BBSIZE);
1618         sb->s_xattr = xfs_xattr_handlers;
1619         sb->s_export_op = &xfs_export_operations;
1620 #ifdef CONFIG_XFS_QUOTA
1621         sb->s_qcop = &xfs_quotactl_operations;
1622         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1623 #endif
1624         sb->s_op = &xfs_super_operations;
1625
1626         /*
1627          * Delay mount work if the debug hook is set. This is debug
1628          * instrumention to coordinate simulation of xfs mount failures with
1629          * VFS superblock operations
1630          */
1631         if (xfs_globals.mount_delay) {
1632                 xfs_notice(mp, "Delaying mount for %d seconds.",
1633                         xfs_globals.mount_delay);
1634                 msleep(xfs_globals.mount_delay * 1000);
1635         }
1636
1637         if (silent)
1638                 flags |= XFS_MFSI_QUIET;
1639
1640         error = xfs_open_devices(mp);
1641         if (error)
1642                 goto out_free_fsname;
1643
1644         error = xfs_init_mount_workqueues(mp);
1645         if (error)
1646                 goto out_close_devices;
1647
1648         error = xfs_init_percpu_counters(mp);
1649         if (error)
1650                 goto out_destroy_workqueues;
1651
1652         /* Allocate stats memory before we do operations that might use it */
1653         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1654         if (!mp->m_stats.xs_stats) {
1655                 error = -ENOMEM;
1656                 goto out_destroy_counters;
1657         }
1658
1659         error = xfs_readsb(mp, flags);
1660         if (error)
1661                 goto out_free_stats;
1662
1663         error = xfs_finish_flags(mp);
1664         if (error)
1665                 goto out_free_sb;
1666
1667         error = xfs_setup_devices(mp);
1668         if (error)
1669                 goto out_free_sb;
1670
1671         error = xfs_filestream_mount(mp);
1672         if (error)
1673                 goto out_free_sb;
1674
1675         /*
1676          * we must configure the block size in the superblock before we run the
1677          * full mount process as the mount process can lookup and cache inodes.
1678          */
1679         sb->s_magic = XFS_SB_MAGIC;
1680         sb->s_blocksize = mp->m_sb.sb_blocksize;
1681         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1682         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1683         sb->s_max_links = XFS_MAXLINK;
1684         sb->s_time_gran = 1;
1685         set_posix_acl_flag(sb);
1686
1687         /* version 5 superblocks support inode version counters. */
1688         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1689                 sb->s_flags |= SB_I_VERSION;
1690
1691         if (mp->m_flags & XFS_MOUNT_DAX) {
1692                 bool rtdev_is_dax = false, datadev_is_dax;
1693
1694                 xfs_warn(mp,
1695                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1696
1697                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1698                         sb->s_blocksize);
1699                 if (mp->m_rtdev_targp)
1700                         rtdev_is_dax = bdev_dax_supported(
1701                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1702                 if (!rtdev_is_dax && !datadev_is_dax) {
1703                         xfs_alert(mp,
1704                         "DAX unsupported by block device. Turning off DAX.");
1705                         mp->m_flags &= ~XFS_MOUNT_DAX;
1706                 }
1707                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1708                         xfs_alert(mp,
1709                 "DAX and reflink cannot be used together!");
1710                         error = -EINVAL;
1711                         goto out_filestream_unmount;
1712                 }
1713         }
1714
1715         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1716                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1717
1718                 if (!blk_queue_discard(q)) {
1719                         xfs_warn(mp, "mounting with \"discard\" option, but "
1720                                         "the device does not support discard");
1721                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1722                 }
1723         }
1724
1725         if (xfs_sb_version_hasreflink(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1726                 xfs_alert(mp,
1727         "reflink not compatible with realtime device!");
1728                 error = -EINVAL;
1729                 goto out_filestream_unmount;
1730         }
1731
1732         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1733                 xfs_alert(mp,
1734         "reverse mapping btree not compatible with realtime device!");
1735                 error = -EINVAL;
1736                 goto out_filestream_unmount;
1737         }
1738
1739         error = xfs_mountfs(mp);
1740         if (error)
1741                 goto out_filestream_unmount;
1742
1743         root = igrab(VFS_I(mp->m_rootip));
1744         if (!root) {
1745                 error = -ENOENT;
1746                 goto out_unmount;
1747         }
1748         sb->s_root = d_make_root(root);
1749         if (!sb->s_root) {
1750                 error = -ENOMEM;
1751                 goto out_unmount;
1752         }
1753
1754         return 0;
1755
1756  out_filestream_unmount:
1757         xfs_filestream_unmount(mp);
1758  out_free_sb:
1759         xfs_freesb(mp);
1760  out_free_stats:
1761         free_percpu(mp->m_stats.xs_stats);
1762  out_destroy_counters:
1763         xfs_destroy_percpu_counters(mp);
1764  out_destroy_workqueues:
1765         xfs_destroy_mount_workqueues(mp);
1766  out_close_devices:
1767         xfs_close_devices(mp);
1768  out_free_fsname:
1769         sb->s_fs_info = NULL;
1770         xfs_free_fsname(mp);
1771         kfree(mp);
1772  out:
1773         return error;
1774
1775  out_unmount:
1776         xfs_filestream_unmount(mp);
1777         xfs_unmountfs(mp);
1778         goto out_free_sb;
1779 }
1780
1781 STATIC void
1782 xfs_fs_put_super(
1783         struct super_block      *sb)
1784 {
1785         struct xfs_mount        *mp = XFS_M(sb);
1786
1787         /* if ->fill_super failed, we have no mount to tear down */
1788         if (!sb->s_fs_info)
1789                 return;
1790
1791         xfs_notice(mp, "Unmounting Filesystem");
1792         xfs_filestream_unmount(mp);
1793         xfs_unmountfs(mp);
1794
1795         xfs_freesb(mp);
1796         free_percpu(mp->m_stats.xs_stats);
1797         xfs_destroy_percpu_counters(mp);
1798         xfs_destroy_mount_workqueues(mp);
1799         xfs_close_devices(mp);
1800
1801         sb->s_fs_info = NULL;
1802         xfs_free_fsname(mp);
1803         kfree(mp);
1804 }
1805
1806 STATIC struct dentry *
1807 xfs_fs_mount(
1808         struct file_system_type *fs_type,
1809         int                     flags,
1810         const char              *dev_name,
1811         void                    *data)
1812 {
1813         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1814 }
1815
1816 static long
1817 xfs_fs_nr_cached_objects(
1818         struct super_block      *sb,
1819         struct shrink_control   *sc)
1820 {
1821         /* Paranoia: catch incorrect calls during mount setup or teardown */
1822         if (WARN_ON_ONCE(!sb->s_fs_info))
1823                 return 0;
1824         return xfs_reclaim_inodes_count(XFS_M(sb));
1825 }
1826
1827 static long
1828 xfs_fs_free_cached_objects(
1829         struct super_block      *sb,
1830         struct shrink_control   *sc)
1831 {
1832         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1833 }
1834
1835 static const struct super_operations xfs_super_operations = {
1836         .alloc_inode            = xfs_fs_alloc_inode,
1837         .destroy_inode          = xfs_fs_destroy_inode,
1838         .dirty_inode            = xfs_fs_dirty_inode,
1839         .drop_inode             = xfs_fs_drop_inode,
1840         .put_super              = xfs_fs_put_super,
1841         .sync_fs                = xfs_fs_sync_fs,
1842         .freeze_fs              = xfs_fs_freeze,
1843         .unfreeze_fs            = xfs_fs_unfreeze,
1844         .statfs                 = xfs_fs_statfs,
1845         .remount_fs             = xfs_fs_remount,
1846         .show_options           = xfs_fs_show_options,
1847         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1848         .free_cached_objects    = xfs_fs_free_cached_objects,
1849 };
1850
1851 static struct file_system_type xfs_fs_type = {
1852         .owner                  = THIS_MODULE,
1853         .name                   = "xfs",
1854         .mount                  = xfs_fs_mount,
1855         .kill_sb                = kill_block_super,
1856         .fs_flags               = FS_REQUIRES_DEV,
1857 };
1858 MODULE_ALIAS_FS("xfs");
1859
1860 STATIC int __init
1861 xfs_init_zones(void)
1862 {
1863         if (bioset_init(&xfs_ioend_bioset, 4 * MAX_BUF_PER_PAGE,
1864                         offsetof(struct xfs_ioend, io_inline_bio),
1865                         BIOSET_NEED_BVECS))
1866                 goto out;
1867
1868         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1869                                                 "xfs_log_ticket");
1870         if (!xfs_log_ticket_zone)
1871                 goto out_free_ioend_bioset;
1872
1873         xfs_bmap_free_item_zone = kmem_zone_init(
1874                         sizeof(struct xfs_extent_free_item),
1875                         "xfs_bmap_free_item");
1876         if (!xfs_bmap_free_item_zone)
1877                 goto out_destroy_log_ticket_zone;
1878
1879         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1880                                                 "xfs_btree_cur");
1881         if (!xfs_btree_cur_zone)
1882                 goto out_destroy_bmap_free_item_zone;
1883
1884         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1885                                                 "xfs_da_state");
1886         if (!xfs_da_state_zone)
1887                 goto out_destroy_btree_cur_zone;
1888
1889         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1890         if (!xfs_ifork_zone)
1891                 goto out_destroy_da_state_zone;
1892
1893         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1894         if (!xfs_trans_zone)
1895                 goto out_destroy_ifork_zone;
1896
1897
1898         /*
1899          * The size of the zone allocated buf log item is the maximum
1900          * size possible under XFS.  This wastes a little bit of memory,
1901          * but it is much faster.
1902          */
1903         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1904                                            "xfs_buf_item");
1905         if (!xfs_buf_item_zone)
1906                 goto out_destroy_trans_zone;
1907
1908         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1909                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1910                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1911         if (!xfs_efd_zone)
1912                 goto out_destroy_buf_item_zone;
1913
1914         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1915                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1916                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1917         if (!xfs_efi_zone)
1918                 goto out_destroy_efd_zone;
1919
1920         xfs_inode_zone =
1921                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1922                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1923                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1924         if (!xfs_inode_zone)
1925                 goto out_destroy_efi_zone;
1926
1927         xfs_ili_zone =
1928                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1929                                         KM_ZONE_SPREAD, NULL);
1930         if (!xfs_ili_zone)
1931                 goto out_destroy_inode_zone;
1932         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1933                                         "xfs_icr");
1934         if (!xfs_icreate_zone)
1935                 goto out_destroy_ili_zone;
1936
1937         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1938                         "xfs_rud_item");
1939         if (!xfs_rud_zone)
1940                 goto out_destroy_icreate_zone;
1941
1942         xfs_rui_zone = kmem_zone_init(
1943                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1944                         "xfs_rui_item");
1945         if (!xfs_rui_zone)
1946                 goto out_destroy_rud_zone;
1947
1948         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1949                         "xfs_cud_item");
1950         if (!xfs_cud_zone)
1951                 goto out_destroy_rui_zone;
1952
1953         xfs_cui_zone = kmem_zone_init(
1954                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1955                         "xfs_cui_item");
1956         if (!xfs_cui_zone)
1957                 goto out_destroy_cud_zone;
1958
1959         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1960                         "xfs_bud_item");
1961         if (!xfs_bud_zone)
1962                 goto out_destroy_cui_zone;
1963
1964         xfs_bui_zone = kmem_zone_init(
1965                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1966                         "xfs_bui_item");
1967         if (!xfs_bui_zone)
1968                 goto out_destroy_bud_zone;
1969
1970         return 0;
1971
1972  out_destroy_bud_zone:
1973         kmem_zone_destroy(xfs_bud_zone);
1974  out_destroy_cui_zone:
1975         kmem_zone_destroy(xfs_cui_zone);
1976  out_destroy_cud_zone:
1977         kmem_zone_destroy(xfs_cud_zone);
1978  out_destroy_rui_zone:
1979         kmem_zone_destroy(xfs_rui_zone);
1980  out_destroy_rud_zone:
1981         kmem_zone_destroy(xfs_rud_zone);
1982  out_destroy_icreate_zone:
1983         kmem_zone_destroy(xfs_icreate_zone);
1984  out_destroy_ili_zone:
1985         kmem_zone_destroy(xfs_ili_zone);
1986  out_destroy_inode_zone:
1987         kmem_zone_destroy(xfs_inode_zone);
1988  out_destroy_efi_zone:
1989         kmem_zone_destroy(xfs_efi_zone);
1990  out_destroy_efd_zone:
1991         kmem_zone_destroy(xfs_efd_zone);
1992  out_destroy_buf_item_zone:
1993         kmem_zone_destroy(xfs_buf_item_zone);
1994  out_destroy_trans_zone:
1995         kmem_zone_destroy(xfs_trans_zone);
1996  out_destroy_ifork_zone:
1997         kmem_zone_destroy(xfs_ifork_zone);
1998  out_destroy_da_state_zone:
1999         kmem_zone_destroy(xfs_da_state_zone);
2000  out_destroy_btree_cur_zone:
2001         kmem_zone_destroy(xfs_btree_cur_zone);
2002  out_destroy_bmap_free_item_zone:
2003         kmem_zone_destroy(xfs_bmap_free_item_zone);
2004  out_destroy_log_ticket_zone:
2005         kmem_zone_destroy(xfs_log_ticket_zone);
2006  out_free_ioend_bioset:
2007         bioset_exit(&xfs_ioend_bioset);
2008  out:
2009         return -ENOMEM;
2010 }
2011
2012 STATIC void
2013 xfs_destroy_zones(void)
2014 {
2015         /*
2016          * Make sure all delayed rcu free are flushed before we
2017          * destroy caches.
2018          */
2019         rcu_barrier();
2020         kmem_zone_destroy(xfs_bui_zone);
2021         kmem_zone_destroy(xfs_bud_zone);
2022         kmem_zone_destroy(xfs_cui_zone);
2023         kmem_zone_destroy(xfs_cud_zone);
2024         kmem_zone_destroy(xfs_rui_zone);
2025         kmem_zone_destroy(xfs_rud_zone);
2026         kmem_zone_destroy(xfs_icreate_zone);
2027         kmem_zone_destroy(xfs_ili_zone);
2028         kmem_zone_destroy(xfs_inode_zone);
2029         kmem_zone_destroy(xfs_efi_zone);
2030         kmem_zone_destroy(xfs_efd_zone);
2031         kmem_zone_destroy(xfs_buf_item_zone);
2032         kmem_zone_destroy(xfs_trans_zone);
2033         kmem_zone_destroy(xfs_ifork_zone);
2034         kmem_zone_destroy(xfs_da_state_zone);
2035         kmem_zone_destroy(xfs_btree_cur_zone);
2036         kmem_zone_destroy(xfs_bmap_free_item_zone);
2037         kmem_zone_destroy(xfs_log_ticket_zone);
2038         bioset_exit(&xfs_ioend_bioset);
2039 }
2040
2041 STATIC int __init
2042 xfs_init_workqueues(void)
2043 {
2044         /*
2045          * The allocation workqueue can be used in memory reclaim situations
2046          * (writepage path), and parallelism is only limited by the number of
2047          * AGs in all the filesystems mounted. Hence use the default large
2048          * max_active value for this workqueue.
2049          */
2050         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2051                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2052         if (!xfs_alloc_wq)
2053                 return -ENOMEM;
2054
2055         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2056         if (!xfs_discard_wq)
2057                 goto out_free_alloc_wq;
2058
2059         return 0;
2060 out_free_alloc_wq:
2061         destroy_workqueue(xfs_alloc_wq);
2062         return -ENOMEM;
2063 }
2064
2065 STATIC void
2066 xfs_destroy_workqueues(void)
2067 {
2068         destroy_workqueue(xfs_discard_wq);
2069         destroy_workqueue(xfs_alloc_wq);
2070 }
2071
2072 STATIC int __init
2073 init_xfs_fs(void)
2074 {
2075         int                     error;
2076
2077         xfs_check_ondisk_structs();
2078
2079         printk(KERN_INFO XFS_VERSION_STRING " with "
2080                          XFS_BUILD_OPTIONS " enabled\n");
2081
2082         xfs_extent_free_init_defer_op();
2083         xfs_rmap_update_init_defer_op();
2084         xfs_refcount_update_init_defer_op();
2085         xfs_bmap_update_init_defer_op();
2086
2087         xfs_dir_startup();
2088
2089         error = xfs_init_zones();
2090         if (error)
2091                 goto out;
2092
2093         error = xfs_init_workqueues();
2094         if (error)
2095                 goto out_destroy_zones;
2096
2097         error = xfs_mru_cache_init();
2098         if (error)
2099                 goto out_destroy_wq;
2100
2101         error = xfs_buf_init();
2102         if (error)
2103                 goto out_mru_cache_uninit;
2104
2105         error = xfs_init_procfs();
2106         if (error)
2107                 goto out_buf_terminate;
2108
2109         error = xfs_sysctl_register();
2110         if (error)
2111                 goto out_cleanup_procfs;
2112
2113         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2114         if (!xfs_kset) {
2115                 error = -ENOMEM;
2116                 goto out_sysctl_unregister;
2117         }
2118
2119         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2120
2121         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2122         if (!xfsstats.xs_stats) {
2123                 error = -ENOMEM;
2124                 goto out_kset_unregister;
2125         }
2126
2127         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2128                                "stats");
2129         if (error)
2130                 goto out_free_stats;
2131
2132 #ifdef DEBUG
2133         xfs_dbg_kobj.kobject.kset = xfs_kset;
2134         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2135         if (error)
2136                 goto out_remove_stats_kobj;
2137 #endif
2138
2139         error = xfs_qm_init();
2140         if (error)
2141                 goto out_remove_dbg_kobj;
2142
2143         error = register_filesystem(&xfs_fs_type);
2144         if (error)
2145                 goto out_qm_exit;
2146         return 0;
2147
2148  out_qm_exit:
2149         xfs_qm_exit();
2150  out_remove_dbg_kobj:
2151 #ifdef DEBUG
2152         xfs_sysfs_del(&xfs_dbg_kobj);
2153  out_remove_stats_kobj:
2154 #endif
2155         xfs_sysfs_del(&xfsstats.xs_kobj);
2156  out_free_stats:
2157         free_percpu(xfsstats.xs_stats);
2158  out_kset_unregister:
2159         kset_unregister(xfs_kset);
2160  out_sysctl_unregister:
2161         xfs_sysctl_unregister();
2162  out_cleanup_procfs:
2163         xfs_cleanup_procfs();
2164  out_buf_terminate:
2165         xfs_buf_terminate();
2166  out_mru_cache_uninit:
2167         xfs_mru_cache_uninit();
2168  out_destroy_wq:
2169         xfs_destroy_workqueues();
2170  out_destroy_zones:
2171         xfs_destroy_zones();
2172  out:
2173         return error;
2174 }
2175
2176 STATIC void __exit
2177 exit_xfs_fs(void)
2178 {
2179         xfs_qm_exit();
2180         unregister_filesystem(&xfs_fs_type);
2181 #ifdef DEBUG
2182         xfs_sysfs_del(&xfs_dbg_kobj);
2183 #endif
2184         xfs_sysfs_del(&xfsstats.xs_kobj);
2185         free_percpu(xfsstats.xs_stats);
2186         kset_unregister(xfs_kset);
2187         xfs_sysctl_unregister();
2188         xfs_cleanup_procfs();
2189         xfs_buf_terminate();
2190         xfs_mru_cache_uninit();
2191         xfs_destroy_workqueues();
2192         xfs_destroy_zones();
2193         xfs_uuid_table_free();
2194 }
2195
2196 module_init(init_xfs_fs);
2197 module_exit(exit_xfs_fs);
2198
2199 MODULE_AUTHOR("Silicon Graphics, Inc.");
2200 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2201 MODULE_LICENSE("GPL");