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_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
  39 #include <linux/magic.h>
  40 #include <linux/parser.h>
  41
  42 static const struct super_operations xfs_super_operations;
  43
  44 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  45 #ifdef DEBUG
  46 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  47 #endif
  48
  49 /*
  50  * Table driven mount option parser.
  51  */
  52 enum {
  53         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
  54         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  55         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  56         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  57         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  58         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  59         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  60         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  61         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
  62 };
  63
  64 static const match_table_t tokens = {
  65         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
  66         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
  67         {Opt_logdev,    "logdev=%s"},   /* log device */
  68         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
  69         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
  70         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
  71         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
  72         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
  73         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
  74         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
  75         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
  76         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
  77         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
  78         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
  79         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
  80         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
  81         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
  82         {Opt_inode32,   "inode32"},     /* inode allocation limited to
  83                                          * XFS_MAXINUMBER_32 */
  84         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
  85         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
  86         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
  87         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
  88                                          * in stat(). */
  89         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
  90         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
  91         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
  92         {Opt_quota,     "quota"},       /* disk quotas (user) */
  93         {Opt_noquota,   "noquota"},     /* no quotas */
  94         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
  95         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
  96         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
  97         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
  98         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
  99         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
 100         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
 101         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
 102         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
 103         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
 104         {Opt_discard,   "discard"},     /* Discard unused blocks */
 105         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
 106         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
 107         {Opt_err,       NULL},
 108 };
 109
 110
 111 STATIC int
 112 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 113 {
 114         int     last, shift_left_factor = 0, _res;
 115         char    *value;
 116         int     ret = 0;
 117
 118         value = match_strdup(s);
 119         if (!value)
 120                 return -ENOMEM;
 121
 122         last = strlen(value) - 1;
 123         if (value[last] == 'K' || value[last] == 'k') {
 124                 shift_left_factor = 10;
 125                 value[last] = '\0';
 126         }
 127         if (value[last] == 'M' || value[last] == 'm') {
 128                 shift_left_factor = 20;
 129                 value[last] = '\0';
 130         }
 131         if (value[last] == 'G' || value[last] == 'g') {
 132                 shift_left_factor = 30;
 133                 value[last] = '\0';
 134         }
 135
 136         if (kstrtoint(value, base, &_res))
 137                 ret = -EINVAL;
 138         kfree(value);
 139         *res = _res << shift_left_factor;
 140         return ret;
 141 }
 142
 143 /*
 144  * This function fills in xfs_mount_t fields based on mount args.
 145  * Note: the superblock has _not_ yet been read in.
 146  *
 147  * Note that this function leaks the various device name allocations on
 148  * failure.  The caller takes care of them.
 149  *
 150  * *sb is const because this is also used to test options on the remount
 151  * path, and we don't want this to have any side effects at remount time.
 152  * Today this function does not change *sb, but just to future-proof...
 153  */
 154 STATIC int
 155 xfs_parseargs(
 156         struct xfs_mount        *mp,
 157         char                    *options)
 158 {
 159         const struct super_block *sb = mp->m_super;
 160         char                    *p;
 161         substring_t             args[MAX_OPT_ARGS];
 162         int                     iosize = 0;
 163         uint8_t                 iosizelog = 0;
 164
 165         /*
 166          * set up the mount name first so all the errors will refer to the
 167          * correct device.
 168          */
 169         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 170         if (!mp->m_fsname)
 171                 return -ENOMEM;
 172         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 173
 174         /*
 175          * Copy binary VFS mount flags we are interested in.
 176          */
 177         if (sb_rdonly(sb))
 178                 mp->m_flags |= XFS_MOUNT_RDONLY;
 179         if (sb->s_flags & SB_DIRSYNC)
 180                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 181         if (sb->s_flags & SB_SYNCHRONOUS)
 182                 mp->m_flags |= XFS_MOUNT_WSYNC;
 183
 184         /*
 185          * Set some default flags that could be cleared by the mount option
 186          * parsing.
 187          */
 188         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 189
 190         /*
 191          * These can be overridden by the mount option parsing.
 192          */
 193         mp->m_logbufs = -1;
 194         mp->m_logbsize = -1;
 195
 196         if (!options)
 197                 goto done;
 198
 199         while ((p = strsep(&options, ",")) != NULL) {
 200                 int             token;
 201
 202                 if (!*p)
 203                         continue;
 204
 205                 token = match_token(p, tokens, args);
 206                 switch (token) {
 207                 case Opt_logbufs:
 208                         if (match_int(args, &mp->m_logbufs))
 209                                 return -EINVAL;
 210                         break;
 211                 case Opt_logbsize:
 212                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
 213                                 return -EINVAL;
 214                         break;
 215                 case Opt_logdev:
 216                         kfree(mp->m_logname);
 217                         mp->m_logname = match_strdup(args);
 218                         if (!mp->m_logname)
 219                                 return -ENOMEM;
 220                         break;
 221                 case Opt_rtdev:
 222                         kfree(mp->m_rtname);
 223                         mp->m_rtname = match_strdup(args);
 224                         if (!mp->m_rtname)
 225                                 return -ENOMEM;
 226                         break;
 227                 case Opt_allocsize:
 228                         if (suffix_kstrtoint(args, 10, &iosize))
 229                                 return -EINVAL;
 230                         iosizelog = ffs(iosize) - 1;
 231                         break;
 232                 case Opt_grpid:
 233                 case Opt_bsdgroups:
 234                         mp->m_flags |= XFS_MOUNT_GRPID;
 235                         break;
 236                 case Opt_nogrpid:
 237                 case Opt_sysvgroups:
 238                         mp->m_flags &= ~XFS_MOUNT_GRPID;
 239                         break;
 240                 case Opt_wsync:
 241                         mp->m_flags |= XFS_MOUNT_WSYNC;
 242                         break;
 243                 case Opt_norecovery:
 244                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
 245                         break;
 246                 case Opt_noalign:
 247                         mp->m_flags |= XFS_MOUNT_NOALIGN;
 248                         break;
 249                 case Opt_swalloc:
 250                         mp->m_flags |= XFS_MOUNT_SWALLOC;
 251                         break;
 252                 case Opt_sunit:
 253                         if (match_int(args, &mp->m_dalign))
 254                                 return -EINVAL;
 255                         break;
 256                 case Opt_swidth:
 257                         if (match_int(args, &mp->m_swidth))
 258                                 return -EINVAL;
 259                         break;
 260                 case Opt_inode32:
 261                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 262                         break;
 263                 case Opt_inode64:
 264                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 265                         break;
 266                 case Opt_nouuid:
 267                         mp->m_flags |= XFS_MOUNT_NOUUID;
 268                         break;
 269                 case Opt_ikeep:
 270                         mp->m_flags |= XFS_MOUNT_IKEEP;
 271                         break;
 272                 case Opt_noikeep:
 273                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
 274                         break;
 275                 case Opt_largeio:
 276                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 277                         break;
 278                 case Opt_nolargeio:
 279                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 280                         break;
 281                 case Opt_attr2:
 282                         mp->m_flags |= XFS_MOUNT_ATTR2;
 283                         break;
 284                 case Opt_noattr2:
 285                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
 286                         mp->m_flags |= XFS_MOUNT_NOATTR2;
 287                         break;
 288                 case Opt_filestreams:
 289                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 290                         break;
 291                 case Opt_noquota:
 292                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 293                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 294                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 295                         break;
 296                 case Opt_quota:
 297                 case Opt_uquota:
 298                 case Opt_usrquota:
 299                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 300                                          XFS_UQUOTA_ENFD);
 301                         break;
 302                 case Opt_qnoenforce:
 303                 case Opt_uqnoenforce:
 304                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 305                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 306                         break;
 307                 case Opt_pquota:
 308                 case Opt_prjquota:
 309                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 310                                          XFS_PQUOTA_ENFD);
 311                         break;
 312                 case Opt_pqnoenforce:
 313                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 314                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
 315                         break;
 316                 case Opt_gquota:
 317                 case Opt_grpquota:
 318                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 319                                          XFS_GQUOTA_ENFD);
 320                         break;
 321                 case Opt_gqnoenforce:
 322                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 323                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
 324                         break;
 325                 case Opt_discard:
 326                         mp->m_flags |= XFS_MOUNT_DISCARD;
 327                         break;
 328                 case Opt_nodiscard:
 329                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
 330                         break;
 331 #ifdef CONFIG_FS_DAX
 332                 case Opt_dax:
 333                         mp->m_flags |= XFS_MOUNT_DAX;
 334                         break;
 335 #endif
 336                 default:
 337                         xfs_warn(mp, "unknown mount option [%s].", p);
 338                         return -EINVAL;
 339                 }
 340         }
 341
 342         /*
 343          * no recovery flag requires a read-only mount
 344          */
 345         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 346             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 347                 xfs_warn(mp, "no-recovery mounts must be read-only.");
 348                 return -EINVAL;
 349         }
 350
 351         if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
 352             (mp->m_dalign || mp->m_swidth)) {
 353                 xfs_warn(mp,
 354         "sunit and swidth options incompatible with the noalign option");
 355                 return -EINVAL;
 356         }
 357
 358 #ifndef CONFIG_XFS_QUOTA
 359         if (XFS_IS_QUOTA_RUNNING(mp)) {
 360                 xfs_warn(mp, "quota support not available in this kernel.");
 361                 return -EINVAL;
 362         }
 363 #endif
 364
 365         if ((mp->m_dalign && !mp->m_swidth) ||
 366             (!mp->m_dalign && mp->m_swidth)) {
 367                 xfs_warn(mp, "sunit and swidth must be specified together");
 368                 return -EINVAL;
 369         }
 370
 371         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
 372                 xfs_warn(mp,
 373         "stripe width (%d) must be a multiple of the stripe unit (%d)",
 374                         mp->m_swidth, mp->m_dalign);
 375                 return -EINVAL;
 376         }
 377
 378 done:
 379         if (mp->m_logbufs != -1 &&
 380             mp->m_logbufs != 0 &&
 381             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 382              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 383                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 384                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 385                 return -EINVAL;
 386         }
 387         if (mp->m_logbsize != -1 &&
 388             mp->m_logbsize !=  0 &&
 389             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 390              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 391              !is_power_of_2(mp->m_logbsize))) {
 392                 xfs_warn(mp,
 393                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 394                         mp->m_logbsize);
 395                 return -EINVAL;
 396         }
 397
 398         if (iosizelog) {
 399                 if (iosizelog > XFS_MAX_IO_LOG ||
 400                     iosizelog < XFS_MIN_IO_LOG) {
 401                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 402                                 iosizelog, XFS_MIN_IO_LOG,
 403                                 XFS_MAX_IO_LOG);
 404                         return -EINVAL;
 405                 }
 406
 407                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 408                 mp->m_readio_log = iosizelog;
 409                 mp->m_writeio_log = iosizelog;
 410         }
 411
 412         return 0;
 413 }
 414
 415 struct proc_xfs_info {
 416         uint64_t        flag;
 417         char            *str;
 418 };
 419
 420 STATIC void
 421 xfs_showargs(
 422         struct xfs_mount        *mp,
 423         struct seq_file         *m)
 424 {
 425         static struct proc_xfs_info xfs_info_set[] = {
 426                 /* the few simple ones we can get from the mount struct */
 427                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 428                 { XFS_MOUNT_WSYNC,              ",wsync" },
 429                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 430                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 431                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 432                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 433                 { XFS_MOUNT_ATTR2,              ",attr2" },
 434                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 435                 { XFS_MOUNT_GRPID,              ",grpid" },
 436                 { XFS_MOUNT_DISCARD,            ",discard" },
 437                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
 438                 { XFS_MOUNT_DAX,                ",dax" },
 439                 { 0, NULL }
 440         };
 441         static struct proc_xfs_info xfs_info_unset[] = {
 442                 /* the few simple ones we can get from the mount struct */
 443                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
 444                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
 445                 { 0, NULL }
 446         };
 447         struct proc_xfs_info    *xfs_infop;
 448
 449         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 450                 if (mp->m_flags & xfs_infop->flag)
 451                         seq_puts(m, xfs_infop->str);
 452         }
 453         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 454                 if (!(mp->m_flags & xfs_infop->flag))
 455                         seq_puts(m, xfs_infop->str);
 456         }
 457
 458         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 459                 seq_printf(m, ",allocsize=%dk",
 460                                 (int)(1 << mp->m_writeio_log) >> 10);
 461
 462         if (mp->m_logbufs > 0)
 463                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 464         if (mp->m_logbsize > 0)
 465                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 466
 467         if (mp->m_logname)
 468                 seq_show_option(m, "logdev", mp->m_logname);
 469         if (mp->m_rtname)
 470                 seq_show_option(m, "rtdev", mp->m_rtname);
 471
 472         if (mp->m_dalign > 0)
 473                 seq_printf(m, ",sunit=%d",
 474                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 475         if (mp->m_swidth > 0)
 476                 seq_printf(m, ",swidth=%d",
 477                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 478
 479         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 480                 seq_puts(m, ",usrquota");
 481         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 482                 seq_puts(m, ",uqnoenforce");
 483
 484         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 485                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 486                         seq_puts(m, ",prjquota");
 487                 else
 488                         seq_puts(m, ",pqnoenforce");
 489         }
 490         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 491                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 492                         seq_puts(m, ",grpquota");
 493                 else
 494                         seq_puts(m, ",gqnoenforce");
 495         }
 496
 497         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 498                 seq_puts(m, ",noquota");
 499 }
 500
 501 static uint64_t
 502 xfs_max_file_offset(
 503         unsigned int            blockshift)
 504 {
 505         unsigned int            pagefactor = 1;
 506         unsigned int            bitshift = BITS_PER_LONG - 1;
 507
 508         /* Figure out maximum filesize, on Linux this can depend on
 509          * the filesystem blocksize (on 32 bit platforms).
 510          * __block_write_begin does this in an [unsigned] long long...
 511          *      page->index << (PAGE_SHIFT - bbits)
 512          * So, for page sized blocks (4K on 32 bit platforms),
 513          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 514          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
 515          * but for smaller blocksizes it is less (bbits = log2 bsize).
 516          */
 517
 518 #if BITS_PER_LONG == 32
 519         ASSERT(sizeof(sector_t) == 8);
 520         pagefactor = PAGE_SIZE;
 521         bitshift = BITS_PER_LONG;
 522 #endif
 523
 524         return (((uint64_t)pagefactor) << bitshift) - 1;
 525 }
 526
 527 /*
 528  * Set parameters for inode allocation heuristics, taking into account
 529  * filesystem size and inode32/inode64 mount options; i.e. specifically
 530  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 531  *
 532  * Inode allocation patterns are altered only if inode32 is requested
 533  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 534  * If altered, XFS_MOUNT_32BITINODES is set as well.
 535  *
 536  * An agcount independent of that in the mount structure is provided
 537  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 538  * to the potentially higher ag count.
 539  *
 540  * Returns the maximum AG index which may contain inodes.
 541  */
 542 xfs_agnumber_t
 543 xfs_set_inode_alloc(
 544         struct xfs_mount *mp,
 545         xfs_agnumber_t  agcount)
 546 {
 547         xfs_agnumber_t  index;
 548         xfs_agnumber_t  maxagi = 0;
 549         xfs_sb_t        *sbp = &mp->m_sb;
 550         xfs_agnumber_t  max_metadata;
 551         xfs_agino_t     agino;
 552         xfs_ino_t       ino;
 553
 554         /*
 555          * Calculate how much should be reserved for inodes to meet
 556          * the max inode percentage.  Used only for inode32.
 557          */
 558         if (M_IGEO(mp)->maxicount) {
 559                 uint64_t        icount;
 560
 561                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 562                 do_div(icount, 100);
 563                 icount += sbp->sb_agblocks - 1;
 564                 do_div(icount, sbp->sb_agblocks);
 565                 max_metadata = icount;
 566         } else {
 567                 max_metadata = agcount;
 568         }
 569
 570         /* Get the last possible inode in the filesystem */
 571         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 572         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 573
 574         /*
 575          * If user asked for no more than 32-bit inodes, and the fs is
 576          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 577          * the allocator to accommodate the request.
 578          */
 579         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 580                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 581         else
 582                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 583
 584         for (index = 0; index < agcount; index++) {
 585                 struct xfs_perag        *pag;
 586
 587                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 588
 589                 pag = xfs_perag_get(mp, index);
 590
 591                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 592                         if (ino > XFS_MAXINUMBER_32) {
 593                                 pag->pagi_inodeok = 0;
 594                                 pag->pagf_metadata = 0;
 595                         } else {
 596                                 pag->pagi_inodeok = 1;
 597                                 maxagi++;
 598                                 if (index < max_metadata)
 599                                         pag->pagf_metadata = 1;
 600                                 else
 601                                         pag->pagf_metadata = 0;
 602                         }
 603                 } else {
 604                         pag->pagi_inodeok = 1;
 605                         pag->pagf_metadata = 0;
 606                 }
 607
 608                 xfs_perag_put(pag);
 609         }
 610
 611         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 612 }
 613
 614 STATIC int
 615 xfs_blkdev_get(
 616         xfs_mount_t             *mp,
 617         const char              *name,
 618         struct block_device     **bdevp)
 619 {
 620         int                     error = 0;
 621
 622         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 623                                     mp);
 624         if (IS_ERR(*bdevp)) {
 625                 error = PTR_ERR(*bdevp);
 626                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 627         }
 628
 629         return error;
 630 }
 631
 632 STATIC void
 633 xfs_blkdev_put(
 634         struct block_device     *bdev)
 635 {
 636         if (bdev)
 637                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 638 }
 639
 640 void
 641 xfs_blkdev_issue_flush(
 642         xfs_buftarg_t           *buftarg)
 643 {
 644         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 645 }
 646
 647 STATIC void
 648 xfs_close_devices(
 649         struct xfs_mount        *mp)
 650 {
 651         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 652
 653         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 654                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 655                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 656
 657                 xfs_free_buftarg(mp->m_logdev_targp);
 658                 xfs_blkdev_put(logdev);
 659                 fs_put_dax(dax_logdev);
 660         }
 661         if (mp->m_rtdev_targp) {
 662                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 663                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 664
 665                 xfs_free_buftarg(mp->m_rtdev_targp);
 666                 xfs_blkdev_put(rtdev);
 667                 fs_put_dax(dax_rtdev);
 668         }
 669         xfs_free_buftarg(mp->m_ddev_targp);
 670         fs_put_dax(dax_ddev);
 671 }
 672
 673 /*
 674  * The file system configurations are:
 675  *      (1) device (partition) with data and internal log
 676  *      (2) logical volume with data and log subvolumes.
 677  *      (3) logical volume with data, log, and realtime subvolumes.
 678  *
 679  * We only have to handle opening the log and realtime volumes here if
 680  * they are present.  The data subvolume has already been opened by
 681  * get_sb_bdev() and is stored in sb->s_bdev.
 682  */
 683 STATIC int
 684 xfs_open_devices(
 685         struct xfs_mount        *mp)
 686 {
 687         struct block_device     *ddev = mp->m_super->s_bdev;
 688         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 689         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 690         struct block_device     *logdev = NULL, *rtdev = NULL;
 691         int                     error;
 692
 693         /*
 694          * Open real time and log devices - order is important.
 695          */
 696         if (mp->m_logname) {
 697                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 698                 if (error)
 699                         goto out;
 700                 dax_logdev = fs_dax_get_by_bdev(logdev);
 701         }
 702
 703         if (mp->m_rtname) {
 704                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 705                 if (error)
 706                         goto out_close_logdev;
 707
 708                 if (rtdev == ddev || rtdev == logdev) {
 709                         xfs_warn(mp,
 710         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 711                         error = -EINVAL;
 712                         goto out_close_rtdev;
 713                 }
 714                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 715         }
 716
 717         /*
 718          * Setup xfs_mount buffer target pointers
 719          */
 720         error = -ENOMEM;
 721         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 722         if (!mp->m_ddev_targp)
 723                 goto out_close_rtdev;
 724
 725         if (rtdev) {
 726                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 727                 if (!mp->m_rtdev_targp)
 728                         goto out_free_ddev_targ;
 729         }
 730
 731         if (logdev && logdev != ddev) {
 732                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 733                 if (!mp->m_logdev_targp)
 734                         goto out_free_rtdev_targ;
 735         } else {
 736                 mp->m_logdev_targp = mp->m_ddev_targp;
 737         }
 738
 739         return 0;
 740
 741  out_free_rtdev_targ:
 742         if (mp->m_rtdev_targp)
 743                 xfs_free_buftarg(mp->m_rtdev_targp);
 744  out_free_ddev_targ:
 745         xfs_free_buftarg(mp->m_ddev_targp);
 746  out_close_rtdev:
 747         xfs_blkdev_put(rtdev);
 748         fs_put_dax(dax_rtdev);
 749  out_close_logdev:
 750         if (logdev && logdev != ddev) {
 751                 xfs_blkdev_put(logdev);
 752                 fs_put_dax(dax_logdev);
 753         }
 754  out:
 755         fs_put_dax(dax_ddev);
 756         return error;
 757 }
 758
 759 /*
 760  * Setup xfs_mount buffer target pointers based on superblock
 761  */
 762 STATIC int
 763 xfs_setup_devices(
 764         struct xfs_mount        *mp)
 765 {
 766         int                     error;
 767
 768         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 769         if (error)
 770                 return error;
 771
 772         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 773                 unsigned int    log_sector_size = BBSIZE;
 774
 775                 if (xfs_sb_version_hassector(&mp->m_sb))
 776                         log_sector_size = mp->m_sb.sb_logsectsize;
 777                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 778                                             log_sector_size);
 779                 if (error)
 780                         return error;
 781         }
 782         if (mp->m_rtdev_targp) {
 783                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 784                                             mp->m_sb.sb_sectsize);
 785                 if (error)
 786                         return error;
 787         }
 788
 789         return 0;
 790 }
 791
 792 STATIC int
 793 xfs_init_mount_workqueues(
 794         struct xfs_mount        *mp)
 795 {
 796         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 797                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
 798         if (!mp->m_buf_workqueue)
 799                 goto out;
 800
 801         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 802                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 803         if (!mp->m_unwritten_workqueue)
 804                 goto out_destroy_buf;
 805
 806         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 807                         WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND,
 808                         0, mp->m_fsname);
 809         if (!mp->m_cil_workqueue)
 810                 goto out_destroy_unwritten;
 811
 812         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 813                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 814         if (!mp->m_reclaim_workqueue)
 815                 goto out_destroy_cil;
 816
 817         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 818                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 819         if (!mp->m_eofblocks_workqueue)
 820                 goto out_destroy_reclaim;
 821
 822         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 823                                                mp->m_fsname);
 824         if (!mp->m_sync_workqueue)
 825                 goto out_destroy_eofb;
 826
 827         return 0;
 828
 829 out_destroy_eofb:
 830         destroy_workqueue(mp->m_eofblocks_workqueue);
 831 out_destroy_reclaim:
 832         destroy_workqueue(mp->m_reclaim_workqueue);
 833 out_destroy_cil:
 834         destroy_workqueue(mp->m_cil_workqueue);
 835 out_destroy_unwritten:
 836         destroy_workqueue(mp->m_unwritten_workqueue);
 837 out_destroy_buf:
 838         destroy_workqueue(mp->m_buf_workqueue);
 839 out:
 840         return -ENOMEM;
 841 }
 842
 843 STATIC void
 844 xfs_destroy_mount_workqueues(
 845         struct xfs_mount        *mp)
 846 {
 847         destroy_workqueue(mp->m_sync_workqueue);
 848         destroy_workqueue(mp->m_eofblocks_workqueue);
 849         destroy_workqueue(mp->m_reclaim_workqueue);
 850         destroy_workqueue(mp->m_cil_workqueue);
 851         destroy_workqueue(mp->m_unwritten_workqueue);
 852         destroy_workqueue(mp->m_buf_workqueue);
 853 }
 854
 855 /*
 856  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 857  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 858  * for IO to complete so that we effectively throttle multiple callers to the
 859  * rate at which IO is completing.
 860  */
 861 void
 862 xfs_flush_inodes(
 863         struct xfs_mount        *mp)
 864 {
 865         struct super_block      *sb = mp->m_super;
 866
 867         if (down_read_trylock(&sb->s_umount)) {
 868                 sync_inodes_sb(sb);
 869                 up_read(&sb->s_umount);
 870         }
 871 }
 872
 873 /* Catch misguided souls that try to use this interface on XFS */
 874 STATIC struct inode *
 875 xfs_fs_alloc_inode(
 876         struct super_block      *sb)
 877 {
 878         BUG();
 879         return NULL;
 880 }
 881
 882 #ifdef DEBUG
 883 static void
 884 xfs_check_delalloc(
 885         struct xfs_inode        *ip,
 886         int                     whichfork)
 887 {
 888         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 889         struct xfs_bmbt_irec    got;
 890         struct xfs_iext_cursor  icur;
 891
 892         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 893                 return;
 894         do {
 895                 if (isnullstartblock(got.br_startblock)) {
 896                         xfs_warn(ip->i_mount,
 897         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 898                                 ip->i_ino,
 899                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 900                                 got.br_startoff, got.br_blockcount);
 901                 }
 902         } while (xfs_iext_next_extent(ifp, &icur, &got));
 903 }
 904 #else
 905 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 906 #endif
 907
 908 /*
 909  * Now that the generic code is guaranteed not to be accessing
 910  * the linux inode, we can inactivate and reclaim the inode.
 911  */
 912 STATIC void
 913 xfs_fs_destroy_inode(
 914         struct inode            *inode)
 915 {
 916         struct xfs_inode        *ip = XFS_I(inode);
 917
 918         trace_xfs_destroy_inode(ip);
 919
 920         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 921         XFS_STATS_INC(ip->i_mount, vn_rele);
 922         XFS_STATS_INC(ip->i_mount, vn_remove);
 923
 924         xfs_inactive(ip);
 925
 926         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 927                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 928                 xfs_check_delalloc(ip, XFS_COW_FORK);
 929                 ASSERT(0);
 930         }
 931
 932         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 933
 934         /*
 935          * We should never get here with one of the reclaim flags already set.
 936          */
 937         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 938         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 939
 940         /*
 941          * We always use background reclaim here because even if the
 942          * inode is clean, it still may be under IO and hence we have
 943          * to take the flush lock. The background reclaim path handles
 944          * this more efficiently than we can here, so simply let background
 945          * reclaim tear down all inodes.
 946          */
 947         xfs_inode_set_reclaim_tag(ip);
 948 }
 949
 950 static void
 951 xfs_fs_dirty_inode(
 952         struct inode                    *inode,
 953         int                             flag)
 954 {
 955         struct xfs_inode                *ip = XFS_I(inode);
 956         struct xfs_mount                *mp = ip->i_mount;
 957         struct xfs_trans                *tp;
 958
 959         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 960                 return;
 961         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 962                 return;
 963
 964         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 965                 return;
 966         xfs_ilock(ip, XFS_ILOCK_EXCL);
 967         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 968         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 969         xfs_trans_commit(tp);
 970 }
 971
 972 /*
 973  * Slab object creation initialisation for the XFS inode.
 974  * This covers only the idempotent fields in the XFS inode;
 975  * all other fields need to be initialised on allocation
 976  * from the slab. This avoids the need to repeatedly initialise
 977  * fields in the xfs inode that left in the initialise state
 978  * when freeing the inode.
 979  */
 980 STATIC void
 981 xfs_fs_inode_init_once(
 982         void                    *inode)
 983 {
 984         struct xfs_inode        *ip = inode;
 985
 986         memset(ip, 0, sizeof(struct xfs_inode));
 987
 988         /* vfs inode */
 989         inode_init_once(VFS_I(ip));
 990
 991         /* xfs inode */
 992         atomic_set(&ip->i_pincount, 0);
 993         spin_lock_init(&ip->i_flags_lock);
 994
 995         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 996                      "xfsino", ip->i_ino);
 997         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 998                      "xfsino", ip->i_ino);
 999 }
1000
1001 /*
1002  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1003  * serialised against cache hits here via the inode->i_lock and igrab() in
1004  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1005  * racing with us, and it avoids needing to grab a spinlock here for every inode
1006  * we drop the final reference on.
1007  */
1008 STATIC int
1009 xfs_fs_drop_inode(
1010         struct inode            *inode)
1011 {
1012         struct xfs_inode        *ip = XFS_I(inode);
1013
1014         /*
1015          * If this unlinked inode is in the middle of recovery, don't
1016          * drop the inode just yet; log recovery will take care of
1017          * that.  See the comment for this inode flag.
1018          */
1019         if (ip->i_flags & XFS_IRECOVERY) {
1020                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1021                 return 0;
1022         }
1023
1024         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1025 }
1026
1027 STATIC void
1028 xfs_free_fsname(
1029         struct xfs_mount        *mp)
1030 {
1031         kfree(mp->m_fsname);
1032         kfree(mp->m_rtname);
1033         kfree(mp->m_logname);
1034 }
1035
1036 STATIC int
1037 xfs_fs_sync_fs(
1038         struct super_block      *sb,
1039         int                     wait)
1040 {
1041         struct xfs_mount        *mp = XFS_M(sb);
1042
1043         /*
1044          * Doing anything during the async pass would be counterproductive.
1045          */
1046         if (!wait)
1047                 return 0;
1048
1049         xfs_log_force(mp, XFS_LOG_SYNC);
1050         if (laptop_mode) {
1051                 /*
1052                  * The disk must be active because we're syncing.
1053                  * We schedule log work now (now that the disk is
1054                  * active) instead of later (when it might not be).
1055                  */
1056                 flush_delayed_work(&mp->m_log->l_work);
1057         }
1058
1059         return 0;
1060 }
1061
1062 STATIC int
1063 xfs_fs_statfs(
1064         struct dentry           *dentry,
1065         struct kstatfs          *statp)
1066 {
1067         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1068         xfs_sb_t                *sbp = &mp->m_sb;
1069         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1070         uint64_t                fakeinos, id;
1071         uint64_t                icount;
1072         uint64_t                ifree;
1073         uint64_t                fdblocks;
1074         xfs_extlen_t            lsize;
1075         int64_t                 ffree;
1076
1077         statp->f_type = XFS_SUPER_MAGIC;
1078         statp->f_namelen = MAXNAMELEN - 1;
1079
1080         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1081         statp->f_fsid.val[0] = (u32)id;
1082         statp->f_fsid.val[1] = (u32)(id >> 32);
1083
1084         icount = percpu_counter_sum(&mp->m_icount);
1085         ifree = percpu_counter_sum(&mp->m_ifree);
1086         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1087
1088         spin_lock(&mp->m_sb_lock);
1089         statp->f_bsize = sbp->sb_blocksize;
1090         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1091         statp->f_blocks = sbp->sb_dblocks - lsize;
1092         spin_unlock(&mp->m_sb_lock);
1093
1094         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1095         statp->f_bavail = statp->f_bfree;
1096
1097         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
1098         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
1099         if (M_IGEO(mp)->maxicount)
1100                 statp->f_files = min_t(typeof(statp->f_files),
1101                                         statp->f_files,
1102                                         M_IGEO(mp)->maxicount);
1103
1104         /* If sb_icount overshot maxicount, report actual allocation */
1105         statp->f_files = max_t(typeof(statp->f_files),
1106                                         statp->f_files,
1107                                         sbp->sb_icount);
1108
1109         /* make sure statp->f_ffree does not underflow */
1110         ffree = statp->f_files - (icount - ifree);
1111         statp->f_ffree = max_t(int64_t, ffree, 0);
1112
1113
1114         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1115             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1116                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1117                 xfs_qm_statvfs(ip, statp);
1118
1119         if (XFS_IS_REALTIME_MOUNT(mp) &&
1120             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
1121                 statp->f_blocks = sbp->sb_rblocks;
1122                 statp->f_bavail = statp->f_bfree =
1123                         sbp->sb_frextents * sbp->sb_rextsize;
1124         }
1125
1126         return 0;
1127 }
1128
1129 STATIC void
1130 xfs_save_resvblks(struct xfs_mount *mp)
1131 {
1132         uint64_t resblks = 0;
1133
1134         mp->m_resblks_save = mp->m_resblks;
1135         xfs_reserve_blocks(mp, &resblks, NULL);
1136 }
1137
1138 STATIC void
1139 xfs_restore_resvblks(struct xfs_mount *mp)
1140 {
1141         uint64_t resblks;
1142
1143         if (mp->m_resblks_save) {
1144                 resblks = mp->m_resblks_save;
1145                 mp->m_resblks_save = 0;
1146         } else
1147                 resblks = xfs_default_resblks(mp);
1148
1149         xfs_reserve_blocks(mp, &resblks, NULL);
1150 }
1151
1152 /*
1153  * Trigger writeback of all the dirty metadata in the file system.
1154  *
1155  * This ensures that the metadata is written to their location on disk rather
1156  * than just existing in transactions in the log. This means after a quiesce
1157  * there is no log replay required to write the inodes to disk - this is the
1158  * primary difference between a sync and a quiesce.
1159  *
1160  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1161  * it is started again when appropriate.
1162  */
1163 void
1164 xfs_quiesce_attr(
1165         struct xfs_mount        *mp)
1166 {
1167         int     error = 0;
1168
1169         /* wait for all modifications to complete */
1170         while (atomic_read(&mp->m_active_trans) > 0)
1171                 delay(100);
1172
1173         /* force the log to unpin objects from the now complete transactions */
1174         xfs_log_force(mp, XFS_LOG_SYNC);
1175
1176         /* reclaim inodes to do any IO before the freeze completes */
1177         xfs_reclaim_inodes(mp, 0);
1178         xfs_reclaim_inodes(mp, SYNC_WAIT);
1179
1180         /* Push the superblock and write an unmount record */
1181         error = xfs_log_sbcount(mp);
1182         if (error)
1183                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1184                                 "Frozen image may not be consistent.");
1185         /*
1186          * Just warn here till VFS can correctly support
1187          * read-only remount without racing.
1188          */
1189         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1190
1191         xfs_log_quiesce(mp);
1192 }
1193
1194 STATIC int
1195 xfs_test_remount_options(
1196         struct super_block      *sb,
1197         char                    *options)
1198 {
1199         int                     error = 0;
1200         struct xfs_mount        *tmp_mp;
1201
1202         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1203         if (!tmp_mp)
1204                 return -ENOMEM;
1205
1206         tmp_mp->m_super = sb;
1207         error = xfs_parseargs(tmp_mp, options);
1208         xfs_free_fsname(tmp_mp);
1209         kmem_free(tmp_mp);
1210
1211         return error;
1212 }
1213
1214 STATIC int
1215 xfs_fs_remount(
1216         struct super_block      *sb,
1217         int                     *flags,
1218         char                    *options)
1219 {
1220         struct xfs_mount        *mp = XFS_M(sb);
1221         xfs_sb_t                *sbp = &mp->m_sb;
1222         substring_t             args[MAX_OPT_ARGS];
1223         char                    *p;
1224         int                     error;
1225
1226         /* First, check for complete junk; i.e. invalid options */
1227         error = xfs_test_remount_options(sb, options);
1228         if (error)
1229                 return error;
1230
1231         sync_filesystem(sb);
1232         while ((p = strsep(&options, ",")) != NULL) {
1233                 int token;
1234
1235                 if (!*p)
1236                         continue;
1237
1238                 token = match_token(p, tokens, args);
1239                 switch (token) {
1240                 case Opt_inode64:
1241                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1242                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1243                         break;
1244                 case Opt_inode32:
1245                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1246                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1247                         break;
1248                 default:
1249                         /*
1250                          * Logically we would return an error here to prevent
1251                          * users from believing they might have changed
1252                          * mount options using remount which can't be changed.
1253                          *
1254                          * But unfortunately mount(8) adds all options from
1255                          * mtab and fstab to the mount arguments in some cases
1256                          * so we can't blindly reject options, but have to
1257                          * check for each specified option if it actually
1258                          * differs from the currently set option and only
1259                          * reject it if that's the case.
1260                          *
1261                          * Until that is implemented we return success for
1262                          * every remount request, and silently ignore all
1263                          * options that we can't actually change.
1264                          */
1265 #if 0
1266                         xfs_info(mp,
1267                 "mount option \"%s\" not supported for remount", p);
1268                         return -EINVAL;
1269 #else
1270                         break;
1271 #endif
1272                 }
1273         }
1274
1275         /* ro -> rw */
1276         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) {
1277                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1278                         xfs_warn(mp,
1279                 "ro->rw transition prohibited on norecovery mount");
1280                         return -EINVAL;
1281                 }
1282
1283                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1284                     xfs_sb_has_ro_compat_feature(sbp,
1285                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1286                         xfs_warn(mp,
1287 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1288                                 (sbp->sb_features_ro_compat &
1289                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1290                         return -EINVAL;
1291                 }
1292
1293                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1294
1295                 /*
1296                  * If this is the first remount to writeable state we
1297                  * might have some superblock changes to update.
1298                  */
1299                 if (mp->m_update_sb) {
1300                         error = xfs_sync_sb(mp, false);
1301                         if (error) {
1302                                 xfs_warn(mp, "failed to write sb changes");
1303                                 return error;
1304                         }
1305                         mp->m_update_sb = false;
1306                 }
1307
1308                 /*
1309                  * Fill out the reserve pool if it is empty. Use the stashed
1310                  * value if it is non-zero, otherwise go with the default.
1311                  */
1312                 xfs_restore_resvblks(mp);
1313                 xfs_log_work_queue(mp);
1314
1315                 /* Recover any CoW blocks that never got remapped. */
1316                 error = xfs_reflink_recover_cow(mp);
1317                 if (error) {
1318                         xfs_err(mp,
1319         "Error %d recovering leftover CoW allocations.", error);
1320                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1321                         return error;
1322                 }
1323                 xfs_start_block_reaping(mp);
1324
1325                 /* Create the per-AG metadata reservation pool .*/
1326                 error = xfs_fs_reserve_ag_blocks(mp);
1327                 if (error && error != -ENOSPC)
1328                         return error;
1329         }
1330
1331         /* rw -> ro */
1332         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) {
1333                 /*
1334                  * Cancel background eofb scanning so it cannot race with the
1335                  * final log force+buftarg wait and deadlock the remount.
1336                  */
1337                 xfs_stop_block_reaping(mp);
1338
1339                 /* Get rid of any leftover CoW reservations... */
1340                 error = xfs_icache_free_cowblocks(mp, NULL);
1341                 if (error) {
1342                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1343                         return error;
1344                 }
1345
1346                 /* Free the per-AG metadata reservation pool. */
1347                 error = xfs_fs_unreserve_ag_blocks(mp);
1348                 if (error) {
1349                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1350                         return error;
1351                 }
1352
1353                 /*
1354                  * Before we sync the metadata, we need to free up the reserve
1355                  * block pool so that the used block count in the superblock on
1356                  * disk is correct at the end of the remount. Stash the current
1357                  * reserve pool size so that if we get remounted rw, we can
1358                  * return it to the same size.
1359                  */
1360                 xfs_save_resvblks(mp);
1361
1362                 xfs_quiesce_attr(mp);
1363                 mp->m_flags |= XFS_MOUNT_RDONLY;
1364         }
1365
1366         return 0;
1367 }
1368
1369 /*
1370  * Second stage of a freeze. The data is already frozen so we only
1371  * need to take care of the metadata. Once that's done sync the superblock
1372  * to the log to dirty it in case of a crash while frozen. This ensures that we
1373  * will recover the unlinked inode lists on the next mount.
1374  */
1375 STATIC int
1376 xfs_fs_freeze(
1377         struct super_block      *sb)
1378 {
1379         struct xfs_mount        *mp = XFS_M(sb);
1380
1381         xfs_stop_block_reaping(mp);
1382         xfs_save_resvblks(mp);
1383         xfs_quiesce_attr(mp);
1384         return xfs_sync_sb(mp, true);
1385 }
1386
1387 STATIC int
1388 xfs_fs_unfreeze(
1389         struct super_block      *sb)
1390 {
1391         struct xfs_mount        *mp = XFS_M(sb);
1392
1393         xfs_restore_resvblks(mp);
1394         xfs_log_work_queue(mp);
1395         xfs_start_block_reaping(mp);
1396         return 0;
1397 }
1398
1399 STATIC int
1400 xfs_fs_show_options(
1401         struct seq_file         *m,
1402         struct dentry           *root)
1403 {
1404         xfs_showargs(XFS_M(root->d_sb), m);
1405         return 0;
1406 }
1407
1408 /*
1409  * This function fills in xfs_mount_t fields based on mount args.
1410  * Note: the superblock _has_ now been read in.
1411  */
1412 STATIC int
1413 xfs_finish_flags(
1414         struct xfs_mount        *mp)
1415 {
1416         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1417
1418         /* Fail a mount where the logbuf is smaller than the log stripe */
1419         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1420                 if (mp->m_logbsize <= 0 &&
1421                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1422                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1423                 } else if (mp->m_logbsize > 0 &&
1424                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1425                         xfs_warn(mp,
1426                 "logbuf size must be greater than or equal to log stripe size");
1427                         return -EINVAL;
1428                 }
1429         } else {
1430                 /* Fail a mount if the logbuf is larger than 32K */
1431                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1432                         xfs_warn(mp,
1433                 "logbuf size for version 1 logs must be 16K or 32K");
1434                         return -EINVAL;
1435                 }
1436         }
1437
1438         /*
1439          * V5 filesystems always use attr2 format for attributes.
1440          */
1441         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1442             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1443                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1444                              "attr2 is always enabled for V5 filesystems.");
1445                 return -EINVAL;
1446         }
1447
1448         /*
1449          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1450          * told by noattr2 to turn it off
1451          */
1452         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1453             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1454                 mp->m_flags |= XFS_MOUNT_ATTR2;
1455
1456         /*
1457          * prohibit r/w mounts of read-only filesystems
1458          */
1459         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1460                 xfs_warn(mp,
1461                         "cannot mount a read-only filesystem as read-write");
1462                 return -EROFS;
1463         }
1464
1465         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1466             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1467             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1468                 xfs_warn(mp,
1469                   "Super block does not support project and group quota together");
1470                 return -EINVAL;
1471         }
1472
1473         return 0;
1474 }
1475
1476 static int
1477 xfs_init_percpu_counters(
1478         struct xfs_mount        *mp)
1479 {
1480         int             error;
1481
1482         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1483         if (error)
1484                 return -ENOMEM;
1485
1486         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1487         if (error)
1488                 goto free_icount;
1489
1490         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1491         if (error)
1492                 goto free_ifree;
1493
1494         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1495         if (error)
1496                 goto free_fdblocks;
1497
1498         return 0;
1499
1500 free_fdblocks:
1501         percpu_counter_destroy(&mp->m_fdblocks);
1502 free_ifree:
1503         percpu_counter_destroy(&mp->m_ifree);
1504 free_icount:
1505         percpu_counter_destroy(&mp->m_icount);
1506         return -ENOMEM;
1507 }
1508
1509 void
1510 xfs_reinit_percpu_counters(
1511         struct xfs_mount        *mp)
1512 {
1513         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1514         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1515         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1516 }
1517
1518 static void
1519 xfs_destroy_percpu_counters(
1520         struct xfs_mount        *mp)
1521 {
1522         percpu_counter_destroy(&mp->m_icount);
1523         percpu_counter_destroy(&mp->m_ifree);
1524         percpu_counter_destroy(&mp->m_fdblocks);
1525         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1526                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1527         percpu_counter_destroy(&mp->m_delalloc_blks);
1528 }
1529
1530 static struct xfs_mount *
1531 xfs_mount_alloc(
1532         struct super_block      *sb)
1533 {
1534         struct xfs_mount        *mp;
1535
1536         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1537         if (!mp)
1538                 return NULL;
1539
1540         mp->m_super = sb;
1541         spin_lock_init(&mp->m_sb_lock);
1542         spin_lock_init(&mp->m_agirotor_lock);
1543         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1544         spin_lock_init(&mp->m_perag_lock);
1545         mutex_init(&mp->m_growlock);
1546         atomic_set(&mp->m_active_trans, 0);
1547         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1548         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1549         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1550         mp->m_kobj.kobject.kset = xfs_kset;
1551         /*
1552          * We don't create the finobt per-ag space reservation until after log
1553          * recovery, so we must set this to true so that an ifree transaction
1554          * started during log recovery will not depend on space reservations
1555          * for finobt expansion.
1556          */
1557         mp->m_finobt_nores = true;
1558         return mp;
1559 }
1560
1561
1562 STATIC int
1563 xfs_fs_fill_super(
1564         struct super_block      *sb,
1565         void                    *data,
1566         int                     silent)
1567 {
1568         struct inode            *root;
1569         struct xfs_mount        *mp = NULL;
1570         int                     flags = 0, error = -ENOMEM;
1571
1572         /*
1573          * allocate mp and do all low-level struct initializations before we
1574          * attach it to the super
1575          */
1576         mp = xfs_mount_alloc(sb);
1577         if (!mp)
1578                 goto out;
1579         sb->s_fs_info = mp;
1580
1581         error = xfs_parseargs(mp, (char *)data);
1582         if (error)
1583                 goto out_free_fsname;
1584
1585         sb_min_blocksize(sb, BBSIZE);
1586         sb->s_xattr = xfs_xattr_handlers;
1587         sb->s_export_op = &xfs_export_operations;
1588 #ifdef CONFIG_XFS_QUOTA
1589         sb->s_qcop = &xfs_quotactl_operations;
1590         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1591 #endif
1592         sb->s_op = &xfs_super_operations;
1593
1594         /*
1595          * Delay mount work if the debug hook is set. This is debug
1596          * instrumention to coordinate simulation of xfs mount failures with
1597          * VFS superblock operations
1598          */
1599         if (xfs_globals.mount_delay) {
1600                 xfs_notice(mp, "Delaying mount for %d seconds.",
1601                         xfs_globals.mount_delay);
1602                 msleep(xfs_globals.mount_delay * 1000);
1603         }
1604
1605         if (silent)
1606                 flags |= XFS_MFSI_QUIET;
1607
1608         error = xfs_open_devices(mp);
1609         if (error)
1610                 goto out_free_fsname;
1611
1612         error = xfs_init_mount_workqueues(mp);
1613         if (error)
1614                 goto out_close_devices;
1615
1616         error = xfs_init_percpu_counters(mp);
1617         if (error)
1618                 goto out_destroy_workqueues;
1619
1620         /* Allocate stats memory before we do operations that might use it */
1621         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1622         if (!mp->m_stats.xs_stats) {
1623                 error = -ENOMEM;
1624                 goto out_destroy_counters;
1625         }
1626
1627         error = xfs_readsb(mp, flags);
1628         if (error)
1629                 goto out_free_stats;
1630
1631         error = xfs_finish_flags(mp);
1632         if (error)
1633                 goto out_free_sb;
1634
1635         error = xfs_setup_devices(mp);
1636         if (error)
1637                 goto out_free_sb;
1638
1639         error = xfs_filestream_mount(mp);
1640         if (error)
1641                 goto out_free_sb;
1642
1643         /*
1644          * we must configure the block size in the superblock before we run the
1645          * full mount process as the mount process can lookup and cache inodes.
1646          */
1647         sb->s_magic = XFS_SUPER_MAGIC;
1648         sb->s_blocksize = mp->m_sb.sb_blocksize;
1649         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1650         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1651         sb->s_max_links = XFS_MAXLINK;
1652         sb->s_time_gran = 1;
1653         sb->s_time_min = S32_MIN;
1654         sb->s_time_max = S32_MAX;
1655         sb->s_iflags |= SB_I_CGROUPWB;
1656
1657         set_posix_acl_flag(sb);
1658
1659         /* version 5 superblocks support inode version counters. */
1660         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1661                 sb->s_flags |= SB_I_VERSION;
1662
1663         if (mp->m_flags & XFS_MOUNT_DAX) {
1664                 bool rtdev_is_dax = false, datadev_is_dax;
1665
1666                 xfs_warn(mp,
1667                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1668
1669                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1670                         sb->s_blocksize);
1671                 if (mp->m_rtdev_targp)
1672                         rtdev_is_dax = bdev_dax_supported(
1673                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1674                 if (!rtdev_is_dax && !datadev_is_dax) {
1675                         xfs_alert(mp,
1676                         "DAX unsupported by block device. Turning off DAX.");
1677                         mp->m_flags &= ~XFS_MOUNT_DAX;
1678                 }
1679                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1680                         xfs_alert(mp,
1681                 "DAX and reflink cannot be used together!");
1682                         error = -EINVAL;
1683                         goto out_filestream_unmount;
1684                 }
1685         }
1686
1687         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1688                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1689
1690                 if (!blk_queue_discard(q)) {
1691                         xfs_warn(mp, "mounting with \"discard\" option, but "
1692                                         "the device does not support discard");
1693                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1694                 }
1695         }
1696
1697         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1698                 if (mp->m_sb.sb_rblocks) {
1699                         xfs_alert(mp,
1700         "reflink not compatible with realtime device!");
1701                         error = -EINVAL;
1702                         goto out_filestream_unmount;
1703                 }
1704
1705                 if (xfs_globals.always_cow) {
1706                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1707                         mp->m_always_cow = true;
1708                 }
1709         }
1710
1711         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1712                 xfs_alert(mp,
1713         "reverse mapping btree not compatible with realtime device!");
1714                 error = -EINVAL;
1715                 goto out_filestream_unmount;
1716         }
1717
1718         error = xfs_mountfs(mp);
1719         if (error)
1720                 goto out_filestream_unmount;
1721
1722         root = igrab(VFS_I(mp->m_rootip));
1723         if (!root) {
1724                 error = -ENOENT;
1725                 goto out_unmount;
1726         }
1727         sb->s_root = d_make_root(root);
1728         if (!sb->s_root) {
1729                 error = -ENOMEM;
1730                 goto out_unmount;
1731         }
1732
1733         return 0;
1734
1735  out_filestream_unmount:
1736         xfs_filestream_unmount(mp);
1737  out_free_sb:
1738         xfs_freesb(mp);
1739  out_free_stats:
1740         free_percpu(mp->m_stats.xs_stats);
1741  out_destroy_counters:
1742         xfs_destroy_percpu_counters(mp);
1743  out_destroy_workqueues:
1744         xfs_destroy_mount_workqueues(mp);
1745  out_close_devices:
1746         xfs_close_devices(mp);
1747  out_free_fsname:
1748         sb->s_fs_info = NULL;
1749         xfs_free_fsname(mp);
1750         kfree(mp);
1751  out:
1752         return error;
1753
1754  out_unmount:
1755         xfs_filestream_unmount(mp);
1756         xfs_unmountfs(mp);
1757         goto out_free_sb;
1758 }
1759
1760 STATIC void
1761 xfs_fs_put_super(
1762         struct super_block      *sb)
1763 {
1764         struct xfs_mount        *mp = XFS_M(sb);
1765
1766         /* if ->fill_super failed, we have no mount to tear down */
1767         if (!sb->s_fs_info)
1768                 return;
1769
1770         xfs_notice(mp, "Unmounting Filesystem");
1771         xfs_filestream_unmount(mp);
1772         xfs_unmountfs(mp);
1773
1774         xfs_freesb(mp);
1775         free_percpu(mp->m_stats.xs_stats);
1776         xfs_destroy_percpu_counters(mp);
1777         xfs_destroy_mount_workqueues(mp);
1778         xfs_close_devices(mp);
1779
1780         sb->s_fs_info = NULL;
1781         xfs_free_fsname(mp);
1782         kfree(mp);
1783 }
1784
1785 STATIC struct dentry *
1786 xfs_fs_mount(
1787         struct file_system_type *fs_type,
1788         int                     flags,
1789         const char              *dev_name,
1790         void                    *data)
1791 {
1792         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1793 }
1794
1795 static long
1796 xfs_fs_nr_cached_objects(
1797         struct super_block      *sb,
1798         struct shrink_control   *sc)
1799 {
1800         /* Paranoia: catch incorrect calls during mount setup or teardown */
1801         if (WARN_ON_ONCE(!sb->s_fs_info))
1802                 return 0;
1803         return xfs_reclaim_inodes_count(XFS_M(sb));
1804 }
1805
1806 static long
1807 xfs_fs_free_cached_objects(
1808         struct super_block      *sb,
1809         struct shrink_control   *sc)
1810 {
1811         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1812 }
1813
1814 static const struct super_operations xfs_super_operations = {
1815         .alloc_inode            = xfs_fs_alloc_inode,
1816         .destroy_inode          = xfs_fs_destroy_inode,
1817         .dirty_inode            = xfs_fs_dirty_inode,
1818         .drop_inode             = xfs_fs_drop_inode,
1819         .put_super              = xfs_fs_put_super,
1820         .sync_fs                = xfs_fs_sync_fs,
1821         .freeze_fs              = xfs_fs_freeze,
1822         .unfreeze_fs            = xfs_fs_unfreeze,
1823         .statfs                 = xfs_fs_statfs,
1824         .remount_fs             = xfs_fs_remount,
1825         .show_options           = xfs_fs_show_options,
1826         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1827         .free_cached_objects    = xfs_fs_free_cached_objects,
1828 };
1829
1830 static struct file_system_type xfs_fs_type = {
1831         .owner                  = THIS_MODULE,
1832         .name                   = "xfs",
1833         .mount                  = xfs_fs_mount,
1834         .kill_sb                = kill_block_super,
1835         .fs_flags               = FS_REQUIRES_DEV,
1836 };
1837 MODULE_ALIAS_FS("xfs");
1838
1839 STATIC int __init
1840 xfs_init_zones(void)
1841 {
1842         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1843                                                 "xfs_log_ticket");
1844         if (!xfs_log_ticket_zone)
1845                 goto out;
1846
1847         xfs_bmap_free_item_zone = kmem_zone_init(
1848                         sizeof(struct xfs_extent_free_item),
1849                         "xfs_bmap_free_item");
1850         if (!xfs_bmap_free_item_zone)
1851                 goto out_destroy_log_ticket_zone;
1852
1853         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1854                                                 "xfs_btree_cur");
1855         if (!xfs_btree_cur_zone)
1856                 goto out_destroy_bmap_free_item_zone;
1857
1858         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1859                                                 "xfs_da_state");
1860         if (!xfs_da_state_zone)
1861                 goto out_destroy_btree_cur_zone;
1862
1863         xfs_ifork_zone = kmem_zone_init(sizeof(struct xfs_ifork), "xfs_ifork");
1864         if (!xfs_ifork_zone)
1865                 goto out_destroy_da_state_zone;
1866
1867         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1868         if (!xfs_trans_zone)
1869                 goto out_destroy_ifork_zone;
1870
1871
1872         /*
1873          * The size of the zone allocated buf log item is the maximum
1874          * size possible under XFS.  This wastes a little bit of memory,
1875          * but it is much faster.
1876          */
1877         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1878                                            "xfs_buf_item");
1879         if (!xfs_buf_item_zone)
1880                 goto out_destroy_trans_zone;
1881
1882         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1883                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1884                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1885         if (!xfs_efd_zone)
1886                 goto out_destroy_buf_item_zone;
1887
1888         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1889                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1890                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1891         if (!xfs_efi_zone)
1892                 goto out_destroy_efd_zone;
1893
1894         xfs_inode_zone =
1895                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1896                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1897                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1898         if (!xfs_inode_zone)
1899                 goto out_destroy_efi_zone;
1900
1901         xfs_ili_zone =
1902                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1903                                         KM_ZONE_SPREAD, NULL);
1904         if (!xfs_ili_zone)
1905                 goto out_destroy_inode_zone;
1906         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1907                                         "xfs_icr");
1908         if (!xfs_icreate_zone)
1909                 goto out_destroy_ili_zone;
1910
1911         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1912                         "xfs_rud_item");
1913         if (!xfs_rud_zone)
1914                 goto out_destroy_icreate_zone;
1915
1916         xfs_rui_zone = kmem_zone_init(
1917                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1918                         "xfs_rui_item");
1919         if (!xfs_rui_zone)
1920                 goto out_destroy_rud_zone;
1921
1922         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1923                         "xfs_cud_item");
1924         if (!xfs_cud_zone)
1925                 goto out_destroy_rui_zone;
1926
1927         xfs_cui_zone = kmem_zone_init(
1928                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1929                         "xfs_cui_item");
1930         if (!xfs_cui_zone)
1931                 goto out_destroy_cud_zone;
1932
1933         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1934                         "xfs_bud_item");
1935         if (!xfs_bud_zone)
1936                 goto out_destroy_cui_zone;
1937
1938         xfs_bui_zone = kmem_zone_init(
1939                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1940                         "xfs_bui_item");
1941         if (!xfs_bui_zone)
1942                 goto out_destroy_bud_zone;
1943
1944         return 0;
1945
1946  out_destroy_bud_zone:
1947         kmem_zone_destroy(xfs_bud_zone);
1948  out_destroy_cui_zone:
1949         kmem_zone_destroy(xfs_cui_zone);
1950  out_destroy_cud_zone:
1951         kmem_zone_destroy(xfs_cud_zone);
1952  out_destroy_rui_zone:
1953         kmem_zone_destroy(xfs_rui_zone);
1954  out_destroy_rud_zone:
1955         kmem_zone_destroy(xfs_rud_zone);
1956  out_destroy_icreate_zone:
1957         kmem_zone_destroy(xfs_icreate_zone);
1958  out_destroy_ili_zone:
1959         kmem_zone_destroy(xfs_ili_zone);
1960  out_destroy_inode_zone:
1961         kmem_zone_destroy(xfs_inode_zone);
1962  out_destroy_efi_zone:
1963         kmem_zone_destroy(xfs_efi_zone);
1964  out_destroy_efd_zone:
1965         kmem_zone_destroy(xfs_efd_zone);
1966  out_destroy_buf_item_zone:
1967         kmem_zone_destroy(xfs_buf_item_zone);
1968  out_destroy_trans_zone:
1969         kmem_zone_destroy(xfs_trans_zone);
1970  out_destroy_ifork_zone:
1971         kmem_zone_destroy(xfs_ifork_zone);
1972  out_destroy_da_state_zone:
1973         kmem_zone_destroy(xfs_da_state_zone);
1974  out_destroy_btree_cur_zone:
1975         kmem_zone_destroy(xfs_btree_cur_zone);
1976  out_destroy_bmap_free_item_zone:
1977         kmem_zone_destroy(xfs_bmap_free_item_zone);
1978  out_destroy_log_ticket_zone:
1979         kmem_zone_destroy(xfs_log_ticket_zone);
1980  out:
1981         return -ENOMEM;
1982 }
1983
1984 STATIC void
1985 xfs_destroy_zones(void)
1986 {
1987         /*
1988          * Make sure all delayed rcu free are flushed before we
1989          * destroy caches.
1990          */
1991         rcu_barrier();
1992         kmem_zone_destroy(xfs_bui_zone);
1993         kmem_zone_destroy(xfs_bud_zone);
1994         kmem_zone_destroy(xfs_cui_zone);
1995         kmem_zone_destroy(xfs_cud_zone);
1996         kmem_zone_destroy(xfs_rui_zone);
1997         kmem_zone_destroy(xfs_rud_zone);
1998         kmem_zone_destroy(xfs_icreate_zone);
1999         kmem_zone_destroy(xfs_ili_zone);
2000         kmem_zone_destroy(xfs_inode_zone);
2001         kmem_zone_destroy(xfs_efi_zone);
2002         kmem_zone_destroy(xfs_efd_zone);
2003         kmem_zone_destroy(xfs_buf_item_zone);
2004         kmem_zone_destroy(xfs_trans_zone);
2005         kmem_zone_destroy(xfs_ifork_zone);
2006         kmem_zone_destroy(xfs_da_state_zone);
2007         kmem_zone_destroy(xfs_btree_cur_zone);
2008         kmem_zone_destroy(xfs_bmap_free_item_zone);
2009         kmem_zone_destroy(xfs_log_ticket_zone);
2010 }
2011
2012 STATIC int __init
2013 xfs_init_workqueues(void)
2014 {
2015         /*
2016          * The allocation workqueue can be used in memory reclaim situations
2017          * (writepage path), and parallelism is only limited by the number of
2018          * AGs in all the filesystems mounted. Hence use the default large
2019          * max_active value for this workqueue.
2020          */
2021         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2022                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2023         if (!xfs_alloc_wq)
2024                 return -ENOMEM;
2025
2026         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2027         if (!xfs_discard_wq)
2028                 goto out_free_alloc_wq;
2029
2030         return 0;
2031 out_free_alloc_wq:
2032         destroy_workqueue(xfs_alloc_wq);
2033         return -ENOMEM;
2034 }
2035
2036 STATIC void
2037 xfs_destroy_workqueues(void)
2038 {
2039         destroy_workqueue(xfs_discard_wq);
2040         destroy_workqueue(xfs_alloc_wq);
2041 }
2042
2043 STATIC int __init
2044 init_xfs_fs(void)
2045 {
2046         int                     error;
2047
2048         xfs_check_ondisk_structs();
2049
2050         printk(KERN_INFO XFS_VERSION_STRING " with "
2051                          XFS_BUILD_OPTIONS " enabled\n");
2052
2053         xfs_dir_startup();
2054
2055         error = xfs_init_zones();
2056         if (error)
2057                 goto out;
2058
2059         error = xfs_init_workqueues();
2060         if (error)
2061                 goto out_destroy_zones;
2062
2063         error = xfs_mru_cache_init();
2064         if (error)
2065                 goto out_destroy_wq;
2066
2067         error = xfs_buf_init();
2068         if (error)
2069                 goto out_mru_cache_uninit;
2070
2071         error = xfs_init_procfs();
2072         if (error)
2073                 goto out_buf_terminate;
2074
2075         error = xfs_sysctl_register();
2076         if (error)
2077                 goto out_cleanup_procfs;
2078
2079         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2080         if (!xfs_kset) {
2081                 error = -ENOMEM;
2082                 goto out_sysctl_unregister;
2083         }
2084
2085         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2086
2087         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2088         if (!xfsstats.xs_stats) {
2089                 error = -ENOMEM;
2090                 goto out_kset_unregister;
2091         }
2092
2093         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2094                                "stats");
2095         if (error)
2096                 goto out_free_stats;
2097
2098 #ifdef DEBUG
2099         xfs_dbg_kobj.kobject.kset = xfs_kset;
2100         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2101         if (error)
2102                 goto out_remove_stats_kobj;
2103 #endif
2104
2105         error = xfs_qm_init();
2106         if (error)
2107                 goto out_remove_dbg_kobj;
2108
2109         error = register_filesystem(&xfs_fs_type);
2110         if (error)
2111                 goto out_qm_exit;
2112         return 0;
2113
2114  out_qm_exit:
2115         xfs_qm_exit();
2116  out_remove_dbg_kobj:
2117 #ifdef DEBUG
2118         xfs_sysfs_del(&xfs_dbg_kobj);
2119  out_remove_stats_kobj:
2120 #endif
2121         xfs_sysfs_del(&xfsstats.xs_kobj);
2122  out_free_stats:
2123         free_percpu(xfsstats.xs_stats);
2124  out_kset_unregister:
2125         kset_unregister(xfs_kset);
2126  out_sysctl_unregister:
2127         xfs_sysctl_unregister();
2128  out_cleanup_procfs:
2129         xfs_cleanup_procfs();
2130  out_buf_terminate:
2131         xfs_buf_terminate();
2132  out_mru_cache_uninit:
2133         xfs_mru_cache_uninit();
2134  out_destroy_wq:
2135         xfs_destroy_workqueues();
2136  out_destroy_zones:
2137         xfs_destroy_zones();
2138  out:
2139         return error;
2140 }
2141
2142 STATIC void __exit
2143 exit_xfs_fs(void)
2144 {
2145         xfs_qm_exit();
2146         unregister_filesystem(&xfs_fs_type);
2147 #ifdef DEBUG
2148         xfs_sysfs_del(&xfs_dbg_kobj);
2149 #endif
2150         xfs_sysfs_del(&xfsstats.xs_kobj);
2151         free_percpu(xfsstats.xs_stats);
2152         kset_unregister(xfs_kset);
2153         xfs_sysctl_unregister();
2154         xfs_cleanup_procfs();
2155         xfs_buf_terminate();
2156         xfs_mru_cache_uninit();
2157         xfs_destroy_workqueues();
2158         xfs_destroy_zones();
2159         xfs_uuid_table_free();
2160 }
2161
2162 module_init(init_xfs_fs);
2163 module_exit(exit_xfs_fs);
2164
2165 MODULE_AUTHOR("Silicon Graphics, Inc.");
2166 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2167 MODULE_LICENSE("GPL");