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 #include "xfs_defer.h"
  42
  43 #include <linux/namei.h>
  44 #include <linux/dax.h>
  45 #include <linux/init.h>
  46 #include <linux/slab.h>
  47 #include <linux/magic.h>
  48 #include <linux/mount.h>
  49 #include <linux/mempool.h>
  50 #include <linux/writeback.h>
  51 #include <linux/kthread.h>
  52 #include <linux/freezer.h>
  53 #include <linux/parser.h>
  54
  55 static const struct super_operations xfs_super_operations;
  56 struct bio_set xfs_ioend_bioset;
  57
  58 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  59 #ifdef DEBUG
  60 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  61 #endif
  62
  63 /*
  64  * Table driven mount option parser.
  65  */
  66 enum {
  67         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
  68         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  69         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  70         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  71         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  72         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  73         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  74         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  75         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
  76 };
  77
  78 static const match_table_t tokens = {
  79         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
  80         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
  81         {Opt_logdev,    "logdev=%s"},   /* log device */
  82         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
  83         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
  84         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
  85         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
  86         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
  87         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
  88         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
  89         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
  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         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
 122         {Opt_err,       NULL},
 123 };
 124
 125
 126 STATIC int
 127 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 128 {
 129         int     last, shift_left_factor = 0, _res;
 130         char    *value;
 131         int     ret = 0;
 132
 133         value = match_strdup(s);
 134         if (!value)
 135                 return -ENOMEM;
 136
 137         last = strlen(value) - 1;
 138         if (value[last] == 'K' || value[last] == 'k') {
 139                 shift_left_factor = 10;
 140                 value[last] = '\0';
 141         }
 142         if (value[last] == 'M' || value[last] == 'm') {
 143                 shift_left_factor = 20;
 144                 value[last] = '\0';
 145         }
 146         if (value[last] == 'G' || value[last] == 'g') {
 147                 shift_left_factor = 30;
 148                 value[last] = '\0';
 149         }
 150
 151         if (kstrtoint(value, base, &_res))
 152                 ret = -EINVAL;
 153         kfree(value);
 154         *res = _res << shift_left_factor;
 155         return ret;
 156 }
 157
 158 /*
 159  * This function fills in xfs_mount_t fields based on mount args.
 160  * Note: the superblock has _not_ yet been read in.
 161  *
 162  * Note that this function leaks the various device name allocations on
 163  * failure.  The caller takes care of them.
 164  *
 165  * *sb is const because this is also used to test options on the remount
 166  * path, and we don't want this to have any side effects at remount time.
 167  * Today this function does not change *sb, but just to future-proof...
 168  */
 169 STATIC int
 170 xfs_parseargs(
 171         struct xfs_mount        *mp,
 172         char                    *options)
 173 {
 174         const struct super_block *sb = mp->m_super;
 175         char                    *p;
 176         substring_t             args[MAX_OPT_ARGS];
 177         int                     dsunit = 0;
 178         int                     dswidth = 0;
 179         int                     iosize = 0;
 180         uint8_t                 iosizelog = 0;
 181
 182         /*
 183          * set up the mount name first so all the errors will refer to the
 184          * correct device.
 185          */
 186         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 187         if (!mp->m_fsname)
 188                 return -ENOMEM;
 189         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 190
 191         /*
 192          * Copy binary VFS mount flags we are interested in.
 193          */
 194         if (sb_rdonly(sb))
 195                 mp->m_flags |= XFS_MOUNT_RDONLY;
 196         if (sb->s_flags & SB_DIRSYNC)
 197                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 198         if (sb->s_flags & SB_SYNCHRONOUS)
 199                 mp->m_flags |= XFS_MOUNT_WSYNC;
 200
 201         /*
 202          * Set some default flags that could be cleared by the mount option
 203          * parsing.
 204          */
 205         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 206
 207         /*
 208          * These can be overridden by the mount option parsing.
 209          */
 210         mp->m_logbufs = -1;
 211         mp->m_logbsize = -1;
 212
 213         if (!options)
 214                 goto done;
 215
 216         while ((p = strsep(&options, ",")) != NULL) {
 217                 int             token;
 218
 219                 if (!*p)
 220                         continue;
 221
 222                 token = match_token(p, tokens, args);
 223                 switch (token) {
 224                 case Opt_logbufs:
 225                         if (match_int(args, &mp->m_logbufs))
 226                                 return -EINVAL;
 227                         break;
 228                 case Opt_logbsize:
 229                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
 230                                 return -EINVAL;
 231                         break;
 232                 case Opt_logdev:
 233                         kfree(mp->m_logname);
 234                         mp->m_logname = match_strdup(args);
 235                         if (!mp->m_logname)
 236                                 return -ENOMEM;
 237                         break;
 238                 case Opt_rtdev:
 239                         kfree(mp->m_rtname);
 240                         mp->m_rtname = match_strdup(args);
 241                         if (!mp->m_rtname)
 242                                 return -ENOMEM;
 243                         break;
 244                 case Opt_allocsize:
 245                 case Opt_biosize:
 246                         if (suffix_kstrtoint(args, 10, &iosize))
 247                                 return -EINVAL;
 248                         iosizelog = ffs(iosize) - 1;
 249                         break;
 250                 case Opt_grpid:
 251                 case Opt_bsdgroups:
 252                         mp->m_flags |= XFS_MOUNT_GRPID;
 253                         break;
 254                 case Opt_nogrpid:
 255                 case Opt_sysvgroups:
 256                         mp->m_flags &= ~XFS_MOUNT_GRPID;
 257                         break;
 258                 case Opt_wsync:
 259                         mp->m_flags |= XFS_MOUNT_WSYNC;
 260                         break;
 261                 case Opt_norecovery:
 262                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
 263                         break;
 264                 case Opt_noalign:
 265                         mp->m_flags |= XFS_MOUNT_NOALIGN;
 266                         break;
 267                 case Opt_swalloc:
 268                         mp->m_flags |= XFS_MOUNT_SWALLOC;
 269                         break;
 270                 case Opt_sunit:
 271                         if (match_int(args, &dsunit))
 272                                 return -EINVAL;
 273                         break;
 274                 case Opt_swidth:
 275                         if (match_int(args, &dswidth))
 276                                 return -EINVAL;
 277                         break;
 278                 case Opt_inode32:
 279                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 280                         break;
 281                 case Opt_inode64:
 282                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 283                         break;
 284                 case Opt_nouuid:
 285                         mp->m_flags |= XFS_MOUNT_NOUUID;
 286                         break;
 287                 case Opt_ikeep:
 288                         mp->m_flags |= XFS_MOUNT_IKEEP;
 289                         break;
 290                 case Opt_noikeep:
 291                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
 292                         break;
 293                 case Opt_largeio:
 294                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 295                         break;
 296                 case Opt_nolargeio:
 297                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 298                         break;
 299                 case Opt_attr2:
 300                         mp->m_flags |= XFS_MOUNT_ATTR2;
 301                         break;
 302                 case Opt_noattr2:
 303                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
 304                         mp->m_flags |= XFS_MOUNT_NOATTR2;
 305                         break;
 306                 case Opt_filestreams:
 307                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 308                         break;
 309                 case Opt_noquota:
 310                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 311                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 312                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 313                         break;
 314                 case Opt_quota:
 315                 case Opt_uquota:
 316                 case Opt_usrquota:
 317                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 318                                          XFS_UQUOTA_ENFD);
 319                         break;
 320                 case Opt_qnoenforce:
 321                 case Opt_uqnoenforce:
 322                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 323                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 324                         break;
 325                 case Opt_pquota:
 326                 case Opt_prjquota:
 327                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 328                                          XFS_PQUOTA_ENFD);
 329                         break;
 330                 case Opt_pqnoenforce:
 331                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 332                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
 333                         break;
 334                 case Opt_gquota:
 335                 case Opt_grpquota:
 336                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 337                                          XFS_GQUOTA_ENFD);
 338                         break;
 339                 case Opt_gqnoenforce:
 340                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 341                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
 342                         break;
 343                 case Opt_discard:
 344                         mp->m_flags |= XFS_MOUNT_DISCARD;
 345                         break;
 346                 case Opt_nodiscard:
 347                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
 348                         break;
 349 #ifdef CONFIG_FS_DAX
 350                 case Opt_dax:
 351                         mp->m_flags |= XFS_MOUNT_DAX;
 352                         break;
 353 #endif
 354                 default:
 355                         xfs_warn(mp, "unknown mount option [%s].", p);
 356                         return -EINVAL;
 357                 }
 358         }
 359
 360         /*
 361          * no recovery flag requires a read-only mount
 362          */
 363         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 364             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 365                 xfs_warn(mp, "no-recovery mounts must be read-only.");
 366                 return -EINVAL;
 367         }
 368
 369         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
 370                 xfs_warn(mp,
 371         "sunit and swidth options incompatible with the noalign option");
 372                 return -EINVAL;
 373         }
 374
 375 #ifndef CONFIG_XFS_QUOTA
 376         if (XFS_IS_QUOTA_RUNNING(mp)) {
 377                 xfs_warn(mp, "quota support not available in this kernel.");
 378                 return -EINVAL;
 379         }
 380 #endif
 381
 382         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 383                 xfs_warn(mp, "sunit and swidth must be specified together");
 384                 return -EINVAL;
 385         }
 386
 387         if (dsunit && (dswidth % dsunit != 0)) {
 388                 xfs_warn(mp,
 389         "stripe width (%d) must be a multiple of the stripe unit (%d)",
 390                         dswidth, dsunit);
 391                 return -EINVAL;
 392         }
 393
 394 done:
 395         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
 396                 /*
 397                  * At this point the superblock has not been read
 398                  * in, therefore we do not know the block size.
 399                  * Before the mount call ends we will convert
 400                  * these to FSBs.
 401                  */
 402                 mp->m_dalign = dsunit;
 403                 mp->m_swidth = dswidth;
 404         }
 405
 406         if (mp->m_logbufs != -1 &&
 407             mp->m_logbufs != 0 &&
 408             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 409              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 410                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 411                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 412                 return -EINVAL;
 413         }
 414         if (mp->m_logbsize != -1 &&
 415             mp->m_logbsize !=  0 &&
 416             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 417              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 418              !is_power_of_2(mp->m_logbsize))) {
 419                 xfs_warn(mp,
 420                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 421                         mp->m_logbsize);
 422                 return -EINVAL;
 423         }
 424
 425         if (iosizelog) {
 426                 if (iosizelog > XFS_MAX_IO_LOG ||
 427                     iosizelog < XFS_MIN_IO_LOG) {
 428                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 429                                 iosizelog, XFS_MIN_IO_LOG,
 430                                 XFS_MAX_IO_LOG);
 431                         return -EINVAL;
 432                 }
 433
 434                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 435                 mp->m_readio_log = iosizelog;
 436                 mp->m_writeio_log = iosizelog;
 437         }
 438
 439         return 0;
 440 }
 441
 442 struct proc_xfs_info {
 443         uint64_t        flag;
 444         char            *str;
 445 };
 446
 447 STATIC void
 448 xfs_showargs(
 449         struct xfs_mount        *mp,
 450         struct seq_file         *m)
 451 {
 452         static struct proc_xfs_info xfs_info_set[] = {
 453                 /* the few simple ones we can get from the mount struct */
 454                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 455                 { XFS_MOUNT_WSYNC,              ",wsync" },
 456                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 457                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 458                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 459                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 460                 { XFS_MOUNT_ATTR2,              ",attr2" },
 461                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 462                 { XFS_MOUNT_GRPID,              ",grpid" },
 463                 { XFS_MOUNT_DISCARD,            ",discard" },
 464                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
 465                 { XFS_MOUNT_DAX,                ",dax" },
 466                 { 0, NULL }
 467         };
 468         static struct proc_xfs_info xfs_info_unset[] = {
 469                 /* the few simple ones we can get from the mount struct */
 470                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
 471                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
 472                 { 0, NULL }
 473         };
 474         struct proc_xfs_info    *xfs_infop;
 475
 476         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 477                 if (mp->m_flags & xfs_infop->flag)
 478                         seq_puts(m, xfs_infop->str);
 479         }
 480         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 481                 if (!(mp->m_flags & xfs_infop->flag))
 482                         seq_puts(m, xfs_infop->str);
 483         }
 484
 485         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 486                 seq_printf(m, ",allocsize=%dk",
 487                                 (int)(1 << mp->m_writeio_log) >> 10);
 488
 489         if (mp->m_logbufs > 0)
 490                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 491         if (mp->m_logbsize > 0)
 492                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 493
 494         if (mp->m_logname)
 495                 seq_show_option(m, "logdev", mp->m_logname);
 496         if (mp->m_rtname)
 497                 seq_show_option(m, "rtdev", mp->m_rtname);
 498
 499         if (mp->m_dalign > 0)
 500                 seq_printf(m, ",sunit=%d",
 501                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 502         if (mp->m_swidth > 0)
 503                 seq_printf(m, ",swidth=%d",
 504                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 505
 506         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 507                 seq_puts(m, ",usrquota");
 508         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 509                 seq_puts(m, ",uqnoenforce");
 510
 511         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 512                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 513                         seq_puts(m, ",prjquota");
 514                 else
 515                         seq_puts(m, ",pqnoenforce");
 516         }
 517         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 518                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 519                         seq_puts(m, ",grpquota");
 520                 else
 521                         seq_puts(m, ",gqnoenforce");
 522         }
 523
 524         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 525                 seq_puts(m, ",noquota");
 526 }
 527
 528 static uint64_t
 529 xfs_max_file_offset(
 530         unsigned int            blockshift)
 531 {
 532         unsigned int            pagefactor = 1;
 533         unsigned int            bitshift = BITS_PER_LONG - 1;
 534
 535         /* Figure out maximum filesize, on Linux this can depend on
 536          * the filesystem blocksize (on 32 bit platforms).
 537          * __block_write_begin does this in an [unsigned] long long...
 538          *      page->index << (PAGE_SHIFT - bbits)
 539          * So, for page sized blocks (4K on 32 bit platforms),
 540          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 541          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
 542          * but for smaller blocksizes it is less (bbits = log2 bsize).
 543          */
 544
 545 #if BITS_PER_LONG == 32
 546         ASSERT(sizeof(sector_t) == 8);
 547         pagefactor = PAGE_SIZE;
 548         bitshift = BITS_PER_LONG;
 549 #endif
 550
 551         return (((uint64_t)pagefactor) << bitshift) - 1;
 552 }
 553
 554 /*
 555  * Set parameters for inode allocation heuristics, taking into account
 556  * filesystem size and inode32/inode64 mount options; i.e. specifically
 557  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 558  *
 559  * Inode allocation patterns are altered only if inode32 is requested
 560  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 561  * If altered, XFS_MOUNT_32BITINODES is set as well.
 562  *
 563  * An agcount independent of that in the mount structure is provided
 564  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 565  * to the potentially higher ag count.
 566  *
 567  * Returns the maximum AG index which may contain inodes.
 568  */
 569 xfs_agnumber_t
 570 xfs_set_inode_alloc(
 571         struct xfs_mount *mp,
 572         xfs_agnumber_t  agcount)
 573 {
 574         xfs_agnumber_t  index;
 575         xfs_agnumber_t  maxagi = 0;
 576         xfs_sb_t        *sbp = &mp->m_sb;
 577         xfs_agnumber_t  max_metadata;
 578         xfs_agino_t     agino;
 579         xfs_ino_t       ino;
 580
 581         /*
 582          * Calculate how much should be reserved for inodes to meet
 583          * the max inode percentage.  Used only for inode32.
 584          */
 585         if (mp->m_maxicount) {
 586                 uint64_t        icount;
 587
 588                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 589                 do_div(icount, 100);
 590                 icount += sbp->sb_agblocks - 1;
 591                 do_div(icount, sbp->sb_agblocks);
 592                 max_metadata = icount;
 593         } else {
 594                 max_metadata = agcount;
 595         }
 596
 597         /* Get the last possible inode in the filesystem */
 598         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 599         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 600
 601         /*
 602          * If user asked for no more than 32-bit inodes, and the fs is
 603          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 604          * the allocator to accommodate the request.
 605          */
 606         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 607                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 608         else
 609                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 610
 611         for (index = 0; index < agcount; index++) {
 612                 struct xfs_perag        *pag;
 613
 614                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 615
 616                 pag = xfs_perag_get(mp, index);
 617
 618                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 619                         if (ino > XFS_MAXINUMBER_32) {
 620                                 pag->pagi_inodeok = 0;
 621                                 pag->pagf_metadata = 0;
 622                         } else {
 623                                 pag->pagi_inodeok = 1;
 624                                 maxagi++;
 625                                 if (index < max_metadata)
 626                                         pag->pagf_metadata = 1;
 627                                 else
 628                                         pag->pagf_metadata = 0;
 629                         }
 630                 } else {
 631                         pag->pagi_inodeok = 1;
 632                         pag->pagf_metadata = 0;
 633                 }
 634
 635                 xfs_perag_put(pag);
 636         }
 637
 638         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 639 }
 640
 641 STATIC int
 642 xfs_blkdev_get(
 643         xfs_mount_t             *mp,
 644         const char              *name,
 645         struct block_device     **bdevp)
 646 {
 647         int                     error = 0;
 648
 649         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 650                                     mp);
 651         if (IS_ERR(*bdevp)) {
 652                 error = PTR_ERR(*bdevp);
 653                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 654         }
 655
 656         return error;
 657 }
 658
 659 STATIC void
 660 xfs_blkdev_put(
 661         struct block_device     *bdev)
 662 {
 663         if (bdev)
 664                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 665 }
 666
 667 void
 668 xfs_blkdev_issue_flush(
 669         xfs_buftarg_t           *buftarg)
 670 {
 671         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 672 }
 673
 674 STATIC void
 675 xfs_close_devices(
 676         struct xfs_mount        *mp)
 677 {
 678         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 679
 680         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 681                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 682                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 683
 684                 xfs_free_buftarg(mp->m_logdev_targp);
 685                 xfs_blkdev_put(logdev);
 686                 fs_put_dax(dax_logdev);
 687         }
 688         if (mp->m_rtdev_targp) {
 689                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 690                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 691
 692                 xfs_free_buftarg(mp->m_rtdev_targp);
 693                 xfs_blkdev_put(rtdev);
 694                 fs_put_dax(dax_rtdev);
 695         }
 696         xfs_free_buftarg(mp->m_ddev_targp);
 697         fs_put_dax(dax_ddev);
 698 }
 699
 700 /*
 701  * The file system configurations are:
 702  *      (1) device (partition) with data and internal log
 703  *      (2) logical volume with data and log subvolumes.
 704  *      (3) logical volume with data, log, and realtime subvolumes.
 705  *
 706  * We only have to handle opening the log and realtime volumes here if
 707  * they are present.  The data subvolume has already been opened by
 708  * get_sb_bdev() and is stored in sb->s_bdev.
 709  */
 710 STATIC int
 711 xfs_open_devices(
 712         struct xfs_mount        *mp)
 713 {
 714         struct block_device     *ddev = mp->m_super->s_bdev;
 715         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 716         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 717         struct block_device     *logdev = NULL, *rtdev = NULL;
 718         int                     error;
 719
 720         /*
 721          * Open real time and log devices - order is important.
 722          */
 723         if (mp->m_logname) {
 724                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 725                 if (error)
 726                         goto out;
 727                 dax_logdev = fs_dax_get_by_bdev(logdev);
 728         }
 729
 730         if (mp->m_rtname) {
 731                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 732                 if (error)
 733                         goto out_close_logdev;
 734
 735                 if (rtdev == ddev || rtdev == logdev) {
 736                         xfs_warn(mp,
 737         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 738                         error = -EINVAL;
 739                         goto out_close_rtdev;
 740                 }
 741                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 742         }
 743
 744         /*
 745          * Setup xfs_mount buffer target pointers
 746          */
 747         error = -ENOMEM;
 748         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 749         if (!mp->m_ddev_targp)
 750                 goto out_close_rtdev;
 751
 752         if (rtdev) {
 753                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 754                 if (!mp->m_rtdev_targp)
 755                         goto out_free_ddev_targ;
 756         }
 757
 758         if (logdev && logdev != ddev) {
 759                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 760                 if (!mp->m_logdev_targp)
 761                         goto out_free_rtdev_targ;
 762         } else {
 763                 mp->m_logdev_targp = mp->m_ddev_targp;
 764         }
 765
 766         return 0;
 767
 768  out_free_rtdev_targ:
 769         if (mp->m_rtdev_targp)
 770                 xfs_free_buftarg(mp->m_rtdev_targp);
 771  out_free_ddev_targ:
 772         xfs_free_buftarg(mp->m_ddev_targp);
 773  out_close_rtdev:
 774         xfs_blkdev_put(rtdev);
 775         fs_put_dax(dax_rtdev);
 776  out_close_logdev:
 777         if (logdev && logdev != ddev) {
 778                 xfs_blkdev_put(logdev);
 779                 fs_put_dax(dax_logdev);
 780         }
 781  out:
 782         fs_put_dax(dax_ddev);
 783         return error;
 784 }
 785
 786 /*
 787  * Setup xfs_mount buffer target pointers based on superblock
 788  */
 789 STATIC int
 790 xfs_setup_devices(
 791         struct xfs_mount        *mp)
 792 {
 793         int                     error;
 794
 795         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 796         if (error)
 797                 return error;
 798
 799         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 800                 unsigned int    log_sector_size = BBSIZE;
 801
 802                 if (xfs_sb_version_hassector(&mp->m_sb))
 803                         log_sector_size = mp->m_sb.sb_logsectsize;
 804                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 805                                             log_sector_size);
 806                 if (error)
 807                         return error;
 808         }
 809         if (mp->m_rtdev_targp) {
 810                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 811                                             mp->m_sb.sb_sectsize);
 812                 if (error)
 813                         return error;
 814         }
 815
 816         return 0;
 817 }
 818
 819 STATIC int
 820 xfs_init_mount_workqueues(
 821         struct xfs_mount        *mp)
 822 {
 823         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 824                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
 825         if (!mp->m_buf_workqueue)
 826                 goto out;
 827
 828         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 829                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 830         if (!mp->m_unwritten_workqueue)
 831                 goto out_destroy_buf;
 832
 833         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 834                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 835         if (!mp->m_cil_workqueue)
 836                 goto out_destroy_unwritten;
 837
 838         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 839                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 840         if (!mp->m_reclaim_workqueue)
 841                 goto out_destroy_cil;
 842
 843         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
 844                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
 845                         mp->m_fsname);
 846         if (!mp->m_log_workqueue)
 847                 goto out_destroy_reclaim;
 848
 849         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 850                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 851         if (!mp->m_eofblocks_workqueue)
 852                 goto out_destroy_log;
 853
 854         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 855                                                mp->m_fsname);
 856         if (!mp->m_sync_workqueue)
 857                 goto out_destroy_eofb;
 858
 859         return 0;
 860
 861 out_destroy_eofb:
 862         destroy_workqueue(mp->m_eofblocks_workqueue);
 863 out_destroy_log:
 864         destroy_workqueue(mp->m_log_workqueue);
 865 out_destroy_reclaim:
 866         destroy_workqueue(mp->m_reclaim_workqueue);
 867 out_destroy_cil:
 868         destroy_workqueue(mp->m_cil_workqueue);
 869 out_destroy_unwritten:
 870         destroy_workqueue(mp->m_unwritten_workqueue);
 871 out_destroy_buf:
 872         destroy_workqueue(mp->m_buf_workqueue);
 873 out:
 874         return -ENOMEM;
 875 }
 876
 877 STATIC void
 878 xfs_destroy_mount_workqueues(
 879         struct xfs_mount        *mp)
 880 {
 881         destroy_workqueue(mp->m_sync_workqueue);
 882         destroy_workqueue(mp->m_eofblocks_workqueue);
 883         destroy_workqueue(mp->m_log_workqueue);
 884         destroy_workqueue(mp->m_reclaim_workqueue);
 885         destroy_workqueue(mp->m_cil_workqueue);
 886         destroy_workqueue(mp->m_unwritten_workqueue);
 887         destroy_workqueue(mp->m_buf_workqueue);
 888 }
 889
 890 /*
 891  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 892  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 893  * for IO to complete so that we effectively throttle multiple callers to the
 894  * rate at which IO is completing.
 895  */
 896 void
 897 xfs_flush_inodes(
 898         struct xfs_mount        *mp)
 899 {
 900         struct super_block      *sb = mp->m_super;
 901
 902         if (down_read_trylock(&sb->s_umount)) {
 903                 sync_inodes_sb(sb);
 904                 up_read(&sb->s_umount);
 905         }
 906 }
 907
 908 /* Catch misguided souls that try to use this interface on XFS */
 909 STATIC struct inode *
 910 xfs_fs_alloc_inode(
 911         struct super_block      *sb)
 912 {
 913         BUG();
 914         return NULL;
 915 }
 916
 917 #ifdef DEBUG
 918 static void
 919 xfs_check_delalloc(
 920         struct xfs_inode        *ip,
 921         int                     whichfork)
 922 {
 923         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 924         struct xfs_bmbt_irec    got;
 925         struct xfs_iext_cursor  icur;
 926
 927         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 928                 return;
 929         do {
 930                 if (isnullstartblock(got.br_startblock)) {
 931                         xfs_warn(ip->i_mount,
 932         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 933                                 ip->i_ino,
 934                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 935                                 got.br_startoff, got.br_blockcount);
 936                 }
 937         } while (xfs_iext_next_extent(ifp, &icur, &got));
 938 }
 939 #else
 940 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 941 #endif
 942
 943 /*
 944  * Now that the generic code is guaranteed not to be accessing
 945  * the linux inode, we can inactivate and reclaim the inode.
 946  */
 947 STATIC void
 948 xfs_fs_destroy_inode(
 949         struct inode            *inode)
 950 {
 951         struct xfs_inode        *ip = XFS_I(inode);
 952
 953         trace_xfs_destroy_inode(ip);
 954
 955         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 956         XFS_STATS_INC(ip->i_mount, vn_rele);
 957         XFS_STATS_INC(ip->i_mount, vn_remove);
 958
 959         xfs_inactive(ip);
 960
 961         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 962                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 963                 xfs_check_delalloc(ip, XFS_COW_FORK);
 964                 ASSERT(0);
 965         }
 966
 967         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 968
 969         /*
 970          * We should never get here with one of the reclaim flags already set.
 971          */
 972         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 973         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 974
 975         /*
 976          * We always use background reclaim here because even if the
 977          * inode is clean, it still may be under IO and hence we have
 978          * to take the flush lock. The background reclaim path handles
 979          * this more efficiently than we can here, so simply let background
 980          * reclaim tear down all inodes.
 981          */
 982         xfs_inode_set_reclaim_tag(ip);
 983 }
 984
 985 static void
 986 xfs_fs_dirty_inode(
 987         struct inode                    *inode,
 988         int                             flag)
 989 {
 990         struct xfs_inode                *ip = XFS_I(inode);
 991         struct xfs_mount                *mp = ip->i_mount;
 992         struct xfs_trans                *tp;
 993
 994         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 995                 return;
 996         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 997                 return;
 998
 999         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
1000                 return;
1001         xfs_ilock(ip, XFS_ILOCK_EXCL);
1002         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1003         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
1004         xfs_trans_commit(tp);
1005 }
1006
1007 /*
1008  * Slab object creation initialisation for the XFS inode.
1009  * This covers only the idempotent fields in the XFS inode;
1010  * all other fields need to be initialised on allocation
1011  * from the slab. This avoids the need to repeatedly initialise
1012  * fields in the xfs inode that left in the initialise state
1013  * when freeing the inode.
1014  */
1015 STATIC void
1016 xfs_fs_inode_init_once(
1017         void                    *inode)
1018 {
1019         struct xfs_inode        *ip = inode;
1020
1021         memset(ip, 0, sizeof(struct xfs_inode));
1022
1023         /* vfs inode */
1024         inode_init_once(VFS_I(ip));
1025
1026         /* xfs inode */
1027         atomic_set(&ip->i_pincount, 0);
1028         spin_lock_init(&ip->i_flags_lock);
1029
1030         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1031                      "xfsino", ip->i_ino);
1032         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1033                      "xfsino", ip->i_ino);
1034 }
1035
1036 /*
1037  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1038  * serialised against cache hits here via the inode->i_lock and igrab() in
1039  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1040  * racing with us, and it avoids needing to grab a spinlock here for every inode
1041  * we drop the final reference on.
1042  */
1043 STATIC int
1044 xfs_fs_drop_inode(
1045         struct inode            *inode)
1046 {
1047         struct xfs_inode        *ip = XFS_I(inode);
1048
1049         /*
1050          * If this unlinked inode is in the middle of recovery, don't
1051          * drop the inode just yet; log recovery will take care of
1052          * that.  See the comment for this inode flag.
1053          */
1054         if (ip->i_flags & XFS_IRECOVERY) {
1055                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1056                 return 0;
1057         }
1058
1059         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1060 }
1061
1062 STATIC void
1063 xfs_free_fsname(
1064         struct xfs_mount        *mp)
1065 {
1066         kfree(mp->m_fsname);
1067         kfree(mp->m_rtname);
1068         kfree(mp->m_logname);
1069 }
1070
1071 STATIC int
1072 xfs_fs_sync_fs(
1073         struct super_block      *sb,
1074         int                     wait)
1075 {
1076         struct xfs_mount        *mp = XFS_M(sb);
1077
1078         /*
1079          * Doing anything during the async pass would be counterproductive.
1080          */
1081         if (!wait)
1082                 return 0;
1083
1084         xfs_log_force(mp, XFS_LOG_SYNC);
1085         if (laptop_mode) {
1086                 /*
1087                  * The disk must be active because we're syncing.
1088                  * We schedule log work now (now that the disk is
1089                  * active) instead of later (when it might not be).
1090                  */
1091                 flush_delayed_work(&mp->m_log->l_work);
1092         }
1093
1094         return 0;
1095 }
1096
1097 STATIC int
1098 xfs_fs_statfs(
1099         struct dentry           *dentry,
1100         struct kstatfs          *statp)
1101 {
1102         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1103         xfs_sb_t                *sbp = &mp->m_sb;
1104         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1105         uint64_t                fakeinos, id;
1106         uint64_t                icount;
1107         uint64_t                ifree;
1108         uint64_t                fdblocks;
1109         xfs_extlen_t            lsize;
1110         int64_t                 ffree;
1111
1112         statp->f_type = XFS_SUPER_MAGIC;
1113         statp->f_namelen = MAXNAMELEN - 1;
1114
1115         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1116         statp->f_fsid.val[0] = (u32)id;
1117         statp->f_fsid.val[1] = (u32)(id >> 32);
1118
1119         icount = percpu_counter_sum(&mp->m_icount);
1120         ifree = percpu_counter_sum(&mp->m_ifree);
1121         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1122
1123         spin_lock(&mp->m_sb_lock);
1124         statp->f_bsize = sbp->sb_blocksize;
1125         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1126         statp->f_blocks = sbp->sb_dblocks - lsize;
1127         spin_unlock(&mp->m_sb_lock);
1128
1129         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1130         statp->f_bavail = statp->f_bfree;
1131
1132         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
1133         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
1134         if (mp->m_maxicount)
1135                 statp->f_files = min_t(typeof(statp->f_files),
1136                                         statp->f_files,
1137                                         mp->m_maxicount);
1138
1139         /* If sb_icount overshot maxicount, report actual allocation */
1140         statp->f_files = max_t(typeof(statp->f_files),
1141                                         statp->f_files,
1142                                         sbp->sb_icount);
1143
1144         /* make sure statp->f_ffree does not underflow */
1145         ffree = statp->f_files - (icount - ifree);
1146         statp->f_ffree = max_t(int64_t, ffree, 0);
1147
1148
1149         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1150             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1151                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1152                 xfs_qm_statvfs(ip, statp);
1153
1154         if (XFS_IS_REALTIME_MOUNT(mp) &&
1155             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
1156                 statp->f_blocks = sbp->sb_rblocks;
1157                 statp->f_bavail = statp->f_bfree =
1158                         sbp->sb_frextents * sbp->sb_rextsize;
1159         }
1160
1161         return 0;
1162 }
1163
1164 STATIC void
1165 xfs_save_resvblks(struct xfs_mount *mp)
1166 {
1167         uint64_t resblks = 0;
1168
1169         mp->m_resblks_save = mp->m_resblks;
1170         xfs_reserve_blocks(mp, &resblks, NULL);
1171 }
1172
1173 STATIC void
1174 xfs_restore_resvblks(struct xfs_mount *mp)
1175 {
1176         uint64_t resblks;
1177
1178         if (mp->m_resblks_save) {
1179                 resblks = mp->m_resblks_save;
1180                 mp->m_resblks_save = 0;
1181         } else
1182                 resblks = xfs_default_resblks(mp);
1183
1184         xfs_reserve_blocks(mp, &resblks, NULL);
1185 }
1186
1187 /*
1188  * Trigger writeback of all the dirty metadata in the file system.
1189  *
1190  * This ensures that the metadata is written to their location on disk rather
1191  * than just existing in transactions in the log. This means after a quiesce
1192  * there is no log replay required to write the inodes to disk - this is the
1193  * primary difference between a sync and a quiesce.
1194  *
1195  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1196  * it is started again when appropriate.
1197  */
1198 void
1199 xfs_quiesce_attr(
1200         struct xfs_mount        *mp)
1201 {
1202         int     error = 0;
1203
1204         /* wait for all modifications to complete */
1205         while (atomic_read(&mp->m_active_trans) > 0)
1206                 delay(100);
1207
1208         /* force the log to unpin objects from the now complete transactions */
1209         xfs_log_force(mp, XFS_LOG_SYNC);
1210
1211         /* reclaim inodes to do any IO before the freeze completes */
1212         xfs_reclaim_inodes(mp, 0);
1213         xfs_reclaim_inodes(mp, SYNC_WAIT);
1214
1215         /* Push the superblock and write an unmount record */
1216         error = xfs_log_sbcount(mp);
1217         if (error)
1218                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1219                                 "Frozen image may not be consistent.");
1220         /*
1221          * Just warn here till VFS can correctly support
1222          * read-only remount without racing.
1223          */
1224         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1225
1226         xfs_log_quiesce(mp);
1227 }
1228
1229 STATIC int
1230 xfs_test_remount_options(
1231         struct super_block      *sb,
1232         char                    *options)
1233 {
1234         int                     error = 0;
1235         struct xfs_mount        *tmp_mp;
1236
1237         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1238         if (!tmp_mp)
1239                 return -ENOMEM;
1240
1241         tmp_mp->m_super = sb;
1242         error = xfs_parseargs(tmp_mp, options);
1243         xfs_free_fsname(tmp_mp);
1244         kmem_free(tmp_mp);
1245
1246         return error;
1247 }
1248
1249 STATIC int
1250 xfs_fs_remount(
1251         struct super_block      *sb,
1252         int                     *flags,
1253         char                    *options)
1254 {
1255         struct xfs_mount        *mp = XFS_M(sb);
1256         xfs_sb_t                *sbp = &mp->m_sb;
1257         substring_t             args[MAX_OPT_ARGS];
1258         char                    *p;
1259         int                     error;
1260
1261         /* First, check for complete junk; i.e. invalid options */
1262         error = xfs_test_remount_options(sb, options);
1263         if (error)
1264                 return error;
1265
1266         sync_filesystem(sb);
1267         while ((p = strsep(&options, ",")) != NULL) {
1268                 int token;
1269
1270                 if (!*p)
1271                         continue;
1272
1273                 token = match_token(p, tokens, args);
1274                 switch (token) {
1275                 case Opt_inode64:
1276                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1277                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1278                         break;
1279                 case Opt_inode32:
1280                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1281                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1282                         break;
1283                 default:
1284                         /*
1285                          * Logically we would return an error here to prevent
1286                          * users from believing they might have changed
1287                          * mount options using remount which can't be changed.
1288                          *
1289                          * But unfortunately mount(8) adds all options from
1290                          * mtab and fstab to the mount arguments in some cases
1291                          * so we can't blindly reject options, but have to
1292                          * check for each specified option if it actually
1293                          * differs from the currently set option and only
1294                          * reject it if that's the case.
1295                          *
1296                          * Until that is implemented we return success for
1297                          * every remount request, and silently ignore all
1298                          * options that we can't actually change.
1299                          */
1300 #if 0
1301                         xfs_info(mp,
1302                 "mount option \"%s\" not supported for remount", p);
1303                         return -EINVAL;
1304 #else
1305                         break;
1306 #endif
1307                 }
1308         }
1309
1310         /* ro -> rw */
1311         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) {
1312                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1313                         xfs_warn(mp,
1314                 "ro->rw transition prohibited on norecovery mount");
1315                         return -EINVAL;
1316                 }
1317
1318                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1319                     xfs_sb_has_ro_compat_feature(sbp,
1320                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1321                         xfs_warn(mp,
1322 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1323                                 (sbp->sb_features_ro_compat &
1324                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1325                         return -EINVAL;
1326                 }
1327
1328                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1329
1330                 /*
1331                  * If this is the first remount to writeable state we
1332                  * might have some superblock changes to update.
1333                  */
1334                 if (mp->m_update_sb) {
1335                         error = xfs_sync_sb(mp, false);
1336                         if (error) {
1337                                 xfs_warn(mp, "failed to write sb changes");
1338                                 return error;
1339                         }
1340                         mp->m_update_sb = false;
1341                 }
1342
1343                 /*
1344                  * Fill out the reserve pool if it is empty. Use the stashed
1345                  * value if it is non-zero, otherwise go with the default.
1346                  */
1347                 xfs_restore_resvblks(mp);
1348                 xfs_log_work_queue(mp);
1349
1350                 /* Recover any CoW blocks that never got remapped. */
1351                 error = xfs_reflink_recover_cow(mp);
1352                 if (error) {
1353                         xfs_err(mp,
1354         "Error %d recovering leftover CoW allocations.", error);
1355                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1356                         return error;
1357                 }
1358                 xfs_start_block_reaping(mp);
1359
1360                 /* Create the per-AG metadata reservation pool .*/
1361                 error = xfs_fs_reserve_ag_blocks(mp);
1362                 if (error && error != -ENOSPC)
1363                         return error;
1364         }
1365
1366         /* rw -> ro */
1367         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) {
1368                 /*
1369                  * Cancel background eofb scanning so it cannot race with the
1370                  * final log force+buftarg wait and deadlock the remount.
1371                  */
1372                 xfs_stop_block_reaping(mp);
1373
1374                 /* Get rid of any leftover CoW reservations... */
1375                 error = xfs_icache_free_cowblocks(mp, NULL);
1376                 if (error) {
1377                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1378                         return error;
1379                 }
1380
1381                 /* Free the per-AG metadata reservation pool. */
1382                 error = xfs_fs_unreserve_ag_blocks(mp);
1383                 if (error) {
1384                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1385                         return error;
1386                 }
1387
1388                 /*
1389                  * Before we sync the metadata, we need to free up the reserve
1390                  * block pool so that the used block count in the superblock on
1391                  * disk is correct at the end of the remount. Stash the current
1392                  * reserve pool size so that if we get remounted rw, we can
1393                  * return it to the same size.
1394                  */
1395                 xfs_save_resvblks(mp);
1396
1397                 xfs_quiesce_attr(mp);
1398                 mp->m_flags |= XFS_MOUNT_RDONLY;
1399         }
1400
1401         return 0;
1402 }
1403
1404 /*
1405  * Second stage of a freeze. The data is already frozen so we only
1406  * need to take care of the metadata. Once that's done sync the superblock
1407  * to the log to dirty it in case of a crash while frozen. This ensures that we
1408  * will recover the unlinked inode lists on the next mount.
1409  */
1410 STATIC int
1411 xfs_fs_freeze(
1412         struct super_block      *sb)
1413 {
1414         struct xfs_mount        *mp = XFS_M(sb);
1415
1416         xfs_stop_block_reaping(mp);
1417         xfs_save_resvblks(mp);
1418         xfs_quiesce_attr(mp);
1419         return xfs_sync_sb(mp, true);
1420 }
1421
1422 STATIC int
1423 xfs_fs_unfreeze(
1424         struct super_block      *sb)
1425 {
1426         struct xfs_mount        *mp = XFS_M(sb);
1427
1428         xfs_restore_resvblks(mp);
1429         xfs_log_work_queue(mp);
1430         xfs_start_block_reaping(mp);
1431         return 0;
1432 }
1433
1434 STATIC int
1435 xfs_fs_show_options(
1436         struct seq_file         *m,
1437         struct dentry           *root)
1438 {
1439         xfs_showargs(XFS_M(root->d_sb), m);
1440         return 0;
1441 }
1442
1443 /*
1444  * This function fills in xfs_mount_t fields based on mount args.
1445  * Note: the superblock _has_ now been read in.
1446  */
1447 STATIC int
1448 xfs_finish_flags(
1449         struct xfs_mount        *mp)
1450 {
1451         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1452
1453         /* Fail a mount where the logbuf is smaller than the log stripe */
1454         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1455                 if (mp->m_logbsize <= 0 &&
1456                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1457                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1458                 } else if (mp->m_logbsize > 0 &&
1459                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1460                         xfs_warn(mp,
1461                 "logbuf size must be greater than or equal to log stripe size");
1462                         return -EINVAL;
1463                 }
1464         } else {
1465                 /* Fail a mount if the logbuf is larger than 32K */
1466                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1467                         xfs_warn(mp,
1468                 "logbuf size for version 1 logs must be 16K or 32K");
1469                         return -EINVAL;
1470                 }
1471         }
1472
1473         /*
1474          * V5 filesystems always use attr2 format for attributes.
1475          */
1476         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1477             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1478                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1479                              "attr2 is always enabled for V5 filesystems.");
1480                 return -EINVAL;
1481         }
1482
1483         /*
1484          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1485          * told by noattr2 to turn it off
1486          */
1487         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1488             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1489                 mp->m_flags |= XFS_MOUNT_ATTR2;
1490
1491         /*
1492          * prohibit r/w mounts of read-only filesystems
1493          */
1494         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1495                 xfs_warn(mp,
1496                         "cannot mount a read-only filesystem as read-write");
1497                 return -EROFS;
1498         }
1499
1500         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1501             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1502             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1503                 xfs_warn(mp,
1504                   "Super block does not support project and group quota together");
1505                 return -EINVAL;
1506         }
1507
1508         return 0;
1509 }
1510
1511 static int
1512 xfs_init_percpu_counters(
1513         struct xfs_mount        *mp)
1514 {
1515         int             error;
1516
1517         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1518         if (error)
1519                 return -ENOMEM;
1520
1521         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1522         if (error)
1523                 goto free_icount;
1524
1525         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1526         if (error)
1527                 goto free_ifree;
1528
1529         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1530         if (error)
1531                 goto free_fdblocks;
1532
1533         return 0;
1534
1535 free_fdblocks:
1536         percpu_counter_destroy(&mp->m_fdblocks);
1537 free_ifree:
1538         percpu_counter_destroy(&mp->m_ifree);
1539 free_icount:
1540         percpu_counter_destroy(&mp->m_icount);
1541         return -ENOMEM;
1542 }
1543
1544 void
1545 xfs_reinit_percpu_counters(
1546         struct xfs_mount        *mp)
1547 {
1548         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1549         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1550         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1551 }
1552
1553 static void
1554 xfs_destroy_percpu_counters(
1555         struct xfs_mount        *mp)
1556 {
1557         percpu_counter_destroy(&mp->m_icount);
1558         percpu_counter_destroy(&mp->m_ifree);
1559         percpu_counter_destroy(&mp->m_fdblocks);
1560         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1561                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1562         percpu_counter_destroy(&mp->m_delalloc_blks);
1563 }
1564
1565 static struct xfs_mount *
1566 xfs_mount_alloc(
1567         struct super_block      *sb)
1568 {
1569         struct xfs_mount        *mp;
1570
1571         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1572         if (!mp)
1573                 return NULL;
1574
1575         mp->m_super = sb;
1576         spin_lock_init(&mp->m_sb_lock);
1577         spin_lock_init(&mp->m_agirotor_lock);
1578         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1579         spin_lock_init(&mp->m_perag_lock);
1580         mutex_init(&mp->m_growlock);
1581         atomic_set(&mp->m_active_trans, 0);
1582         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1583         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1584         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1585         mp->m_kobj.kobject.kset = xfs_kset;
1586         /*
1587          * We don't create the finobt per-ag space reservation until after log
1588          * recovery, so we must set this to true so that an ifree transaction
1589          * started during log recovery will not depend on space reservations
1590          * for finobt expansion.
1591          */
1592         mp->m_finobt_nores = true;
1593         return mp;
1594 }
1595
1596
1597 STATIC int
1598 xfs_fs_fill_super(
1599         struct super_block      *sb,
1600         void                    *data,
1601         int                     silent)
1602 {
1603         struct inode            *root;
1604         struct xfs_mount        *mp = NULL;
1605         int                     flags = 0, error = -ENOMEM;
1606
1607         /*
1608          * allocate mp and do all low-level struct initializations before we
1609          * attach it to the super
1610          */
1611         mp = xfs_mount_alloc(sb);
1612         if (!mp)
1613                 goto out;
1614         sb->s_fs_info = mp;
1615
1616         error = xfs_parseargs(mp, (char *)data);
1617         if (error)
1618                 goto out_free_fsname;
1619
1620         sb_min_blocksize(sb, BBSIZE);
1621         sb->s_xattr = xfs_xattr_handlers;
1622         sb->s_export_op = &xfs_export_operations;
1623 #ifdef CONFIG_XFS_QUOTA
1624         sb->s_qcop = &xfs_quotactl_operations;
1625         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1626 #endif
1627         sb->s_op = &xfs_super_operations;
1628
1629         /*
1630          * Delay mount work if the debug hook is set. This is debug
1631          * instrumention to coordinate simulation of xfs mount failures with
1632          * VFS superblock operations
1633          */
1634         if (xfs_globals.mount_delay) {
1635                 xfs_notice(mp, "Delaying mount for %d seconds.",
1636                         xfs_globals.mount_delay);
1637                 msleep(xfs_globals.mount_delay * 1000);
1638         }
1639
1640         if (silent)
1641                 flags |= XFS_MFSI_QUIET;
1642
1643         error = xfs_open_devices(mp);
1644         if (error)
1645                 goto out_free_fsname;
1646
1647         error = xfs_init_mount_workqueues(mp);
1648         if (error)
1649                 goto out_close_devices;
1650
1651         error = xfs_init_percpu_counters(mp);
1652         if (error)
1653                 goto out_destroy_workqueues;
1654
1655         /* Allocate stats memory before we do operations that might use it */
1656         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1657         if (!mp->m_stats.xs_stats) {
1658                 error = -ENOMEM;
1659                 goto out_destroy_counters;
1660         }
1661
1662         error = xfs_readsb(mp, flags);
1663         if (error)
1664                 goto out_free_stats;
1665
1666         error = xfs_finish_flags(mp);
1667         if (error)
1668                 goto out_free_sb;
1669
1670         error = xfs_setup_devices(mp);
1671         if (error)
1672                 goto out_free_sb;
1673
1674         error = xfs_filestream_mount(mp);
1675         if (error)
1676                 goto out_free_sb;
1677
1678         /*
1679          * we must configure the block size in the superblock before we run the
1680          * full mount process as the mount process can lookup and cache inodes.
1681          */
1682         sb->s_magic = XFS_SUPER_MAGIC;
1683         sb->s_blocksize = mp->m_sb.sb_blocksize;
1684         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1685         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1686         sb->s_max_links = XFS_MAXLINK;
1687         sb->s_time_gran = 1;
1688         set_posix_acl_flag(sb);
1689
1690         /* version 5 superblocks support inode version counters. */
1691         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1692                 sb->s_flags |= SB_I_VERSION;
1693
1694         if (mp->m_flags & XFS_MOUNT_DAX) {
1695                 bool rtdev_is_dax = false, datadev_is_dax;
1696
1697                 xfs_warn(mp,
1698                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1699
1700                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1701                         sb->s_blocksize);
1702                 if (mp->m_rtdev_targp)
1703                         rtdev_is_dax = bdev_dax_supported(
1704                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1705                 if (!rtdev_is_dax && !datadev_is_dax) {
1706                         xfs_alert(mp,
1707                         "DAX unsupported by block device. Turning off DAX.");
1708                         mp->m_flags &= ~XFS_MOUNT_DAX;
1709                 }
1710                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1711                         xfs_alert(mp,
1712                 "DAX and reflink cannot be used together!");
1713                         error = -EINVAL;
1714                         goto out_filestream_unmount;
1715                 }
1716         }
1717
1718         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1719                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1720
1721                 if (!blk_queue_discard(q)) {
1722                         xfs_warn(mp, "mounting with \"discard\" option, but "
1723                                         "the device does not support discard");
1724                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1725                 }
1726         }
1727
1728         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1729                 if (mp->m_sb.sb_rblocks) {
1730                         xfs_alert(mp,
1731         "reflink not compatible with realtime device!");
1732                         error = -EINVAL;
1733                         goto out_filestream_unmount;
1734                 }
1735
1736                 if (xfs_globals.always_cow) {
1737                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1738                         mp->m_always_cow = true;
1739                 }
1740         }
1741
1742         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1743                 xfs_alert(mp,
1744         "reverse mapping btree not compatible with realtime device!");
1745                 error = -EINVAL;
1746                 goto out_filestream_unmount;
1747         }
1748
1749         error = xfs_mountfs(mp);
1750         if (error)
1751                 goto out_filestream_unmount;
1752
1753         root = igrab(VFS_I(mp->m_rootip));
1754         if (!root) {
1755                 error = -ENOENT;
1756                 goto out_unmount;
1757         }
1758         sb->s_root = d_make_root(root);
1759         if (!sb->s_root) {
1760                 error = -ENOMEM;
1761                 goto out_unmount;
1762         }
1763
1764         return 0;
1765
1766  out_filestream_unmount:
1767         xfs_filestream_unmount(mp);
1768  out_free_sb:
1769         xfs_freesb(mp);
1770  out_free_stats:
1771         free_percpu(mp->m_stats.xs_stats);
1772  out_destroy_counters:
1773         xfs_destroy_percpu_counters(mp);
1774  out_destroy_workqueues:
1775         xfs_destroy_mount_workqueues(mp);
1776  out_close_devices:
1777         xfs_close_devices(mp);
1778  out_free_fsname:
1779         sb->s_fs_info = NULL;
1780         xfs_free_fsname(mp);
1781         kfree(mp);
1782  out:
1783         return error;
1784
1785  out_unmount:
1786         xfs_filestream_unmount(mp);
1787         xfs_unmountfs(mp);
1788         goto out_free_sb;
1789 }
1790
1791 STATIC void
1792 xfs_fs_put_super(
1793         struct super_block      *sb)
1794 {
1795         struct xfs_mount        *mp = XFS_M(sb);
1796
1797         /* if ->fill_super failed, we have no mount to tear down */
1798         if (!sb->s_fs_info)
1799                 return;
1800
1801         xfs_notice(mp, "Unmounting Filesystem");
1802         xfs_filestream_unmount(mp);
1803         xfs_unmountfs(mp);
1804
1805         xfs_freesb(mp);
1806         free_percpu(mp->m_stats.xs_stats);
1807         xfs_destroy_percpu_counters(mp);
1808         xfs_destroy_mount_workqueues(mp);
1809         xfs_close_devices(mp);
1810
1811         sb->s_fs_info = NULL;
1812         xfs_free_fsname(mp);
1813         kfree(mp);
1814 }
1815
1816 STATIC struct dentry *
1817 xfs_fs_mount(
1818         struct file_system_type *fs_type,
1819         int                     flags,
1820         const char              *dev_name,
1821         void                    *data)
1822 {
1823         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1824 }
1825
1826 static long
1827 xfs_fs_nr_cached_objects(
1828         struct super_block      *sb,
1829         struct shrink_control   *sc)
1830 {
1831         /* Paranoia: catch incorrect calls during mount setup or teardown */
1832         if (WARN_ON_ONCE(!sb->s_fs_info))
1833                 return 0;
1834         return xfs_reclaim_inodes_count(XFS_M(sb));
1835 }
1836
1837 static long
1838 xfs_fs_free_cached_objects(
1839         struct super_block      *sb,
1840         struct shrink_control   *sc)
1841 {
1842         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1843 }
1844
1845 static const struct super_operations xfs_super_operations = {
1846         .alloc_inode            = xfs_fs_alloc_inode,
1847         .destroy_inode          = xfs_fs_destroy_inode,
1848         .dirty_inode            = xfs_fs_dirty_inode,
1849         .drop_inode             = xfs_fs_drop_inode,
1850         .put_super              = xfs_fs_put_super,
1851         .sync_fs                = xfs_fs_sync_fs,
1852         .freeze_fs              = xfs_fs_freeze,
1853         .unfreeze_fs            = xfs_fs_unfreeze,
1854         .statfs                 = xfs_fs_statfs,
1855         .remount_fs             = xfs_fs_remount,
1856         .show_options           = xfs_fs_show_options,
1857         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1858         .free_cached_objects    = xfs_fs_free_cached_objects,
1859 };
1860
1861 static struct file_system_type xfs_fs_type = {
1862         .owner                  = THIS_MODULE,
1863         .name                   = "xfs",
1864         .mount                  = xfs_fs_mount,
1865         .kill_sb                = kill_block_super,
1866         .fs_flags               = FS_REQUIRES_DEV,
1867 };
1868 MODULE_ALIAS_FS("xfs");
1869
1870 STATIC int __init
1871 xfs_init_zones(void)
1872 {
1873         if (bioset_init(&xfs_ioend_bioset, 4 * (PAGE_SIZE / SECTOR_SIZE),
1874                         offsetof(struct xfs_ioend, io_inline_bio),
1875                         BIOSET_NEED_BVECS))
1876                 goto out;
1877
1878         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1879                                                 "xfs_log_ticket");
1880         if (!xfs_log_ticket_zone)
1881                 goto out_free_ioend_bioset;
1882
1883         xfs_bmap_free_item_zone = kmem_zone_init(
1884                         sizeof(struct xfs_extent_free_item),
1885                         "xfs_bmap_free_item");
1886         if (!xfs_bmap_free_item_zone)
1887                 goto out_destroy_log_ticket_zone;
1888
1889         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1890                                                 "xfs_btree_cur");
1891         if (!xfs_btree_cur_zone)
1892                 goto out_destroy_bmap_free_item_zone;
1893
1894         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1895                                                 "xfs_da_state");
1896         if (!xfs_da_state_zone)
1897                 goto out_destroy_btree_cur_zone;
1898
1899         xfs_ifork_zone = kmem_zone_init(sizeof(struct xfs_ifork), "xfs_ifork");
1900         if (!xfs_ifork_zone)
1901                 goto out_destroy_da_state_zone;
1902
1903         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1904         if (!xfs_trans_zone)
1905                 goto out_destroy_ifork_zone;
1906
1907
1908         /*
1909          * The size of the zone allocated buf log item is the maximum
1910          * size possible under XFS.  This wastes a little bit of memory,
1911          * but it is much faster.
1912          */
1913         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1914                                            "xfs_buf_item");
1915         if (!xfs_buf_item_zone)
1916                 goto out_destroy_trans_zone;
1917
1918         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1919                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1920                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1921         if (!xfs_efd_zone)
1922                 goto out_destroy_buf_item_zone;
1923
1924         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1925                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1926                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1927         if (!xfs_efi_zone)
1928                 goto out_destroy_efd_zone;
1929
1930         xfs_inode_zone =
1931                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1932                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1933                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1934         if (!xfs_inode_zone)
1935                 goto out_destroy_efi_zone;
1936
1937         xfs_ili_zone =
1938                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1939                                         KM_ZONE_SPREAD, NULL);
1940         if (!xfs_ili_zone)
1941                 goto out_destroy_inode_zone;
1942         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1943                                         "xfs_icr");
1944         if (!xfs_icreate_zone)
1945                 goto out_destroy_ili_zone;
1946
1947         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1948                         "xfs_rud_item");
1949         if (!xfs_rud_zone)
1950                 goto out_destroy_icreate_zone;
1951
1952         xfs_rui_zone = kmem_zone_init(
1953                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1954                         "xfs_rui_item");
1955         if (!xfs_rui_zone)
1956                 goto out_destroy_rud_zone;
1957
1958         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1959                         "xfs_cud_item");
1960         if (!xfs_cud_zone)
1961                 goto out_destroy_rui_zone;
1962
1963         xfs_cui_zone = kmem_zone_init(
1964                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1965                         "xfs_cui_item");
1966         if (!xfs_cui_zone)
1967                 goto out_destroy_cud_zone;
1968
1969         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1970                         "xfs_bud_item");
1971         if (!xfs_bud_zone)
1972                 goto out_destroy_cui_zone;
1973
1974         xfs_bui_zone = kmem_zone_init(
1975                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1976                         "xfs_bui_item");
1977         if (!xfs_bui_zone)
1978                 goto out_destroy_bud_zone;
1979
1980         return 0;
1981
1982  out_destroy_bud_zone:
1983         kmem_zone_destroy(xfs_bud_zone);
1984  out_destroy_cui_zone:
1985         kmem_zone_destroy(xfs_cui_zone);
1986  out_destroy_cud_zone:
1987         kmem_zone_destroy(xfs_cud_zone);
1988  out_destroy_rui_zone:
1989         kmem_zone_destroy(xfs_rui_zone);
1990  out_destroy_rud_zone:
1991         kmem_zone_destroy(xfs_rud_zone);
1992  out_destroy_icreate_zone:
1993         kmem_zone_destroy(xfs_icreate_zone);
1994  out_destroy_ili_zone:
1995         kmem_zone_destroy(xfs_ili_zone);
1996  out_destroy_inode_zone:
1997         kmem_zone_destroy(xfs_inode_zone);
1998  out_destroy_efi_zone:
1999         kmem_zone_destroy(xfs_efi_zone);
2000  out_destroy_efd_zone:
2001         kmem_zone_destroy(xfs_efd_zone);
2002  out_destroy_buf_item_zone:
2003         kmem_zone_destroy(xfs_buf_item_zone);
2004  out_destroy_trans_zone:
2005         kmem_zone_destroy(xfs_trans_zone);
2006  out_destroy_ifork_zone:
2007         kmem_zone_destroy(xfs_ifork_zone);
2008  out_destroy_da_state_zone:
2009         kmem_zone_destroy(xfs_da_state_zone);
2010  out_destroy_btree_cur_zone:
2011         kmem_zone_destroy(xfs_btree_cur_zone);
2012  out_destroy_bmap_free_item_zone:
2013         kmem_zone_destroy(xfs_bmap_free_item_zone);
2014  out_destroy_log_ticket_zone:
2015         kmem_zone_destroy(xfs_log_ticket_zone);
2016  out_free_ioend_bioset:
2017         bioset_exit(&xfs_ioend_bioset);
2018  out:
2019         return -ENOMEM;
2020 }
2021
2022 STATIC void
2023 xfs_destroy_zones(void)
2024 {
2025         /*
2026          * Make sure all delayed rcu free are flushed before we
2027          * destroy caches.
2028          */
2029         rcu_barrier();
2030         kmem_zone_destroy(xfs_bui_zone);
2031         kmem_zone_destroy(xfs_bud_zone);
2032         kmem_zone_destroy(xfs_cui_zone);
2033         kmem_zone_destroy(xfs_cud_zone);
2034         kmem_zone_destroy(xfs_rui_zone);
2035         kmem_zone_destroy(xfs_rud_zone);
2036         kmem_zone_destroy(xfs_icreate_zone);
2037         kmem_zone_destroy(xfs_ili_zone);
2038         kmem_zone_destroy(xfs_inode_zone);
2039         kmem_zone_destroy(xfs_efi_zone);
2040         kmem_zone_destroy(xfs_efd_zone);
2041         kmem_zone_destroy(xfs_buf_item_zone);
2042         kmem_zone_destroy(xfs_trans_zone);
2043         kmem_zone_destroy(xfs_ifork_zone);
2044         kmem_zone_destroy(xfs_da_state_zone);
2045         kmem_zone_destroy(xfs_btree_cur_zone);
2046         kmem_zone_destroy(xfs_bmap_free_item_zone);
2047         kmem_zone_destroy(xfs_log_ticket_zone);
2048         bioset_exit(&xfs_ioend_bioset);
2049 }
2050
2051 STATIC int __init
2052 xfs_init_workqueues(void)
2053 {
2054         /*
2055          * The allocation workqueue can be used in memory reclaim situations
2056          * (writepage path), and parallelism is only limited by the number of
2057          * AGs in all the filesystems mounted. Hence use the default large
2058          * max_active value for this workqueue.
2059          */
2060         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2061                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2062         if (!xfs_alloc_wq)
2063                 return -ENOMEM;
2064
2065         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2066         if (!xfs_discard_wq)
2067                 goto out_free_alloc_wq;
2068
2069         return 0;
2070 out_free_alloc_wq:
2071         destroy_workqueue(xfs_alloc_wq);
2072         return -ENOMEM;
2073 }
2074
2075 STATIC void
2076 xfs_destroy_workqueues(void)
2077 {
2078         destroy_workqueue(xfs_discard_wq);
2079         destroy_workqueue(xfs_alloc_wq);
2080 }
2081
2082 STATIC int __init
2083 init_xfs_fs(void)
2084 {
2085         int                     error;
2086
2087         xfs_check_ondisk_structs();
2088
2089         printk(KERN_INFO XFS_VERSION_STRING " with "
2090                          XFS_BUILD_OPTIONS " enabled\n");
2091
2092         xfs_dir_startup();
2093
2094         error = xfs_init_zones();
2095         if (error)
2096                 goto out;
2097
2098         error = xfs_init_workqueues();
2099         if (error)
2100                 goto out_destroy_zones;
2101
2102         error = xfs_mru_cache_init();
2103         if (error)
2104                 goto out_destroy_wq;
2105
2106         error = xfs_buf_init();
2107         if (error)
2108                 goto out_mru_cache_uninit;
2109
2110         error = xfs_init_procfs();
2111         if (error)
2112                 goto out_buf_terminate;
2113
2114         error = xfs_sysctl_register();
2115         if (error)
2116                 goto out_cleanup_procfs;
2117
2118         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2119         if (!xfs_kset) {
2120                 error = -ENOMEM;
2121                 goto out_sysctl_unregister;
2122         }
2123
2124         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2125
2126         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2127         if (!xfsstats.xs_stats) {
2128                 error = -ENOMEM;
2129                 goto out_kset_unregister;
2130         }
2131
2132         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2133                                "stats");
2134         if (error)
2135                 goto out_free_stats;
2136
2137 #ifdef DEBUG
2138         xfs_dbg_kobj.kobject.kset = xfs_kset;
2139         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2140         if (error)
2141                 goto out_remove_stats_kobj;
2142 #endif
2143
2144         error = xfs_qm_init();
2145         if (error)
2146                 goto out_remove_dbg_kobj;
2147
2148         error = register_filesystem(&xfs_fs_type);
2149         if (error)
2150                 goto out_qm_exit;
2151         return 0;
2152
2153  out_qm_exit:
2154         xfs_qm_exit();
2155  out_remove_dbg_kobj:
2156 #ifdef DEBUG
2157         xfs_sysfs_del(&xfs_dbg_kobj);
2158  out_remove_stats_kobj:
2159 #endif
2160         xfs_sysfs_del(&xfsstats.xs_kobj);
2161  out_free_stats:
2162         free_percpu(xfsstats.xs_stats);
2163  out_kset_unregister:
2164         kset_unregister(xfs_kset);
2165  out_sysctl_unregister:
2166         xfs_sysctl_unregister();
2167  out_cleanup_procfs:
2168         xfs_cleanup_procfs();
2169  out_buf_terminate:
2170         xfs_buf_terminate();
2171  out_mru_cache_uninit:
2172         xfs_mru_cache_uninit();
2173  out_destroy_wq:
2174         xfs_destroy_workqueues();
2175  out_destroy_zones:
2176         xfs_destroy_zones();
2177  out:
2178         return error;
2179 }
2180
2181 STATIC void __exit
2182 exit_xfs_fs(void)
2183 {
2184         xfs_qm_exit();
2185         unregister_filesystem(&xfs_fs_type);
2186 #ifdef DEBUG
2187         xfs_sysfs_del(&xfs_dbg_kobj);
2188 #endif
2189         xfs_sysfs_del(&xfsstats.xs_kobj);
2190         free_percpu(xfsstats.xs_stats);
2191         kset_unregister(xfs_kset);
2192         xfs_sysctl_unregister();
2193         xfs_cleanup_procfs();
2194         xfs_buf_terminate();
2195         xfs_mru_cache_uninit();
2196         xfs_destroy_workqueues();
2197         xfs_destroy_zones();
2198         xfs_uuid_table_free();
2199 }
2200
2201 module_init(init_xfs_fs);
2202 module_exit(exit_xfs_fs);
2203
2204 MODULE_AUTHOR("Silicon Graphics, Inc.");
2205 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2206 MODULE_LICENSE("GPL");