fs/xfs/xfs_super.c

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include "xfs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_da_format.h"
  27 #include "xfs_inode.h"
  28 #include "xfs_btree.h"
  29 #include "xfs_bmap.h"
  30 #include "xfs_alloc.h"
  31 #include "xfs_error.h"
  32 #include "xfs_fsops.h"
  33 #include "xfs_trans.h"
  34 #include "xfs_buf_item.h"
  35 #include "xfs_log.h"
  36 #include "xfs_log_priv.h"
  37 #include "xfs_da_btree.h"
  38 #include "xfs_dir2.h"
  39 #include "xfs_extfree_item.h"
  40 #include "xfs_mru_cache.h"
  41 #include "xfs_inode_item.h"
  42 #include "xfs_icache.h"
  43 #include "xfs_trace.h"
  44 #include "xfs_icreate_item.h"
  45 #include "xfs_filestream.h"
  46 #include "xfs_quota.h"
  47 #include "xfs_sysfs.h"
  48 #include "xfs_ondisk.h"
  49 #include "xfs_rmap_item.h"
  50 #include "xfs_refcount_item.h"
  51 #include "xfs_bmap_item.h"
  52 #include "xfs_reflink.h"
  53
  54 #include <linux/namei.h>
  55 #include <linux/dax.h>
  56 #include <linux/init.h>
  57 #include <linux/slab.h>
  58 #include <linux/mount.h>
  59 #include <linux/mempool.h>
  60 #include <linux/writeback.h>
  61 #include <linux/kthread.h>
  62 #include <linux/freezer.h>
  63 #include <linux/parser.h>
  64
  65 static const struct super_operations xfs_super_operations;
  66 struct bio_set *xfs_ioend_bioset;
  67
  68 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  69 #ifdef DEBUG
  70 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  71 #endif
  72
  73 /*
  74  * Table driven mount option parser.
  75  */
  76 enum {
  77         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
  78         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  79         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  80         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
  81         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
  82         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
  83         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
  84         Opt_uquota, Opt_gquota, Opt_pquota,
  85         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  86         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
  87 };
  88
  89 static const match_table_t tokens = {
  90         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
  91         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
  92         {Opt_logdev,    "logdev=%s"},   /* log device */
  93         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
  94         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
  95         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
  96         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
  97         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
  98         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
  99         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
 100         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
 101         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
 102         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
 103         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
 104         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
 105         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
 106         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
 107         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
 108         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
 109         {Opt_inode32,   "inode32"},     /* inode allocation limited to
 110                                          * XFS_MAXINUMBER_32 */
 111         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
 112         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
 113         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
 114         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
 115                                          * in stat(). */
 116         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
 117         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
 118         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
 119         {Opt_quota,     "quota"},       /* disk quotas (user) */
 120         {Opt_noquota,   "noquota"},     /* no quotas */
 121         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
 122         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
 123         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
 124         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
 125         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
 126         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
 127         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
 128         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
 129         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
 130         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
 131         {Opt_discard,   "discard"},     /* Discard unused blocks */
 132         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
 133
 134         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
 135
 136         /* Deprecated mount options scheduled for removal */
 137         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
 138                                          * unwritten extent conversion */
 139         {Opt_nobarrier, "nobarrier"},   /* .. disable */
 140
 141         {Opt_err,       NULL},
 142 };
 143
 144
 145 STATIC int
 146 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 147 {
 148         int     last, shift_left_factor = 0, _res;
 149         char    *value;
 150         int     ret = 0;
 151
 152         value = match_strdup(s);
 153         if (!value)
 154                 return -ENOMEM;
 155
 156         last = strlen(value) - 1;
 157         if (value[last] == 'K' || value[last] == 'k') {
 158                 shift_left_factor = 10;
 159                 value[last] = '\0';
 160         }
 161         if (value[last] == 'M' || value[last] == 'm') {
 162                 shift_left_factor = 20;
 163                 value[last] = '\0';
 164         }
 165         if (value[last] == 'G' || value[last] == 'g') {
 166                 shift_left_factor = 30;
 167                 value[last] = '\0';
 168         }
 169
 170         if (kstrtoint(value, base, &_res))
 171                 ret = -EINVAL;
 172         kfree(value);
 173         *res = _res << shift_left_factor;
 174         return ret;
 175 }
 176
 177 /*
 178  * This function fills in xfs_mount_t fields based on mount args.
 179  * Note: the superblock has _not_ yet been read in.
 180  *
 181  * Note that this function leaks the various device name allocations on
 182  * failure.  The caller takes care of them.
 183  *
 184  * *sb is const because this is also used to test options on the remount
 185  * path, and we don't want this to have any side effects at remount time.
 186  * Today this function does not change *sb, but just to future-proof...
 187  */
 188 STATIC int
 189 xfs_parseargs(
 190         struct xfs_mount        *mp,
 191         char                    *options)
 192 {
 193         const struct super_block *sb = mp->m_super;
 194         char                    *p;
 195         substring_t             args[MAX_OPT_ARGS];
 196         int                     dsunit = 0;
 197         int                     dswidth = 0;
 198         int                     iosize = 0;
 199         uint8_t                 iosizelog = 0;
 200
 201         /*
 202          * set up the mount name first so all the errors will refer to the
 203          * correct device.
 204          */
 205         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 206         if (!mp->m_fsname)
 207                 return -ENOMEM;
 208         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 209
 210         /*
 211          * Copy binary VFS mount flags we are interested in.
 212          */
 213         if (sb_rdonly(sb))
 214                 mp->m_flags |= XFS_MOUNT_RDONLY;
 215         if (sb->s_flags & MS_DIRSYNC)
 216                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 217         if (sb->s_flags & MS_SYNCHRONOUS)
 218                 mp->m_flags |= XFS_MOUNT_WSYNC;
 219
 220         /*
 221          * Set some default flags that could be cleared by the mount option
 222          * parsing.
 223          */
 224         mp->m_flags |= XFS_MOUNT_BARRIER;
 225         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 226
 227         /*
 228          * These can be overridden by the mount option parsing.
 229          */
 230         mp->m_logbufs = -1;
 231         mp->m_logbsize = -1;
 232
 233         if (!options)
 234                 goto done;
 235
 236         while ((p = strsep(&options, ",")) != NULL) {
 237                 int             token;
 238
 239                 if (!*p)
 240                         continue;
 241
 242                 token = match_token(p, tokens, args);
 243                 switch (token) {
 244                 case Opt_logbufs:
 245                         if (match_int(args, &mp->m_logbufs))
 246                                 return -EINVAL;
 247                         break;
 248                 case Opt_logbsize:
 249                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
 250                                 return -EINVAL;
 251                         break;
 252                 case Opt_logdev:
 253                         mp->m_logname = match_strdup(args);
 254                         if (!mp->m_logname)
 255                                 return -ENOMEM;
 256                         break;
 257                 case Opt_mtpt:
 258                         xfs_warn(mp, "%s option not allowed on this system", p);
 259                         return -EINVAL;
 260                 case Opt_rtdev:
 261                         mp->m_rtname = match_strdup(args);
 262                         if (!mp->m_rtname)
 263                                 return -ENOMEM;
 264                         break;
 265                 case Opt_allocsize:
 266                 case Opt_biosize:
 267                         if (suffix_kstrtoint(args, 10, &iosize))
 268                                 return -EINVAL;
 269                         iosizelog = ffs(iosize) - 1;
 270                         break;
 271                 case Opt_grpid:
 272                 case Opt_bsdgroups:
 273                         mp->m_flags |= XFS_MOUNT_GRPID;
 274                         break;
 275                 case Opt_nogrpid:
 276                 case Opt_sysvgroups:
 277                         mp->m_flags &= ~XFS_MOUNT_GRPID;
 278                         break;
 279                 case Opt_wsync:
 280                         mp->m_flags |= XFS_MOUNT_WSYNC;
 281                         break;
 282                 case Opt_norecovery:
 283                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
 284                         break;
 285                 case Opt_noalign:
 286                         mp->m_flags |= XFS_MOUNT_NOALIGN;
 287                         break;
 288                 case Opt_swalloc:
 289                         mp->m_flags |= XFS_MOUNT_SWALLOC;
 290                         break;
 291                 case Opt_sunit:
 292                         if (match_int(args, &dsunit))
 293                                 return -EINVAL;
 294                         break;
 295                 case Opt_swidth:
 296                         if (match_int(args, &dswidth))
 297                                 return -EINVAL;
 298                         break;
 299                 case Opt_inode32:
 300                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 301                         break;
 302                 case Opt_inode64:
 303                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 304                         break;
 305                 case Opt_nouuid:
 306                         mp->m_flags |= XFS_MOUNT_NOUUID;
 307                         break;
 308                 case Opt_ikeep:
 309                         mp->m_flags |= XFS_MOUNT_IKEEP;
 310                         break;
 311                 case Opt_noikeep:
 312                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
 313                         break;
 314                 case Opt_largeio:
 315                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 316                         break;
 317                 case Opt_nolargeio:
 318                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 319                         break;
 320                 case Opt_attr2:
 321                         mp->m_flags |= XFS_MOUNT_ATTR2;
 322                         break;
 323                 case Opt_noattr2:
 324                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
 325                         mp->m_flags |= XFS_MOUNT_NOATTR2;
 326                         break;
 327                 case Opt_filestreams:
 328                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 329                         break;
 330                 case Opt_noquota:
 331                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 332                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 333                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 334                         break;
 335                 case Opt_quota:
 336                 case Opt_uquota:
 337                 case Opt_usrquota:
 338                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 339                                          XFS_UQUOTA_ENFD);
 340                         break;
 341                 case Opt_qnoenforce:
 342                 case Opt_uqnoenforce:
 343                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 344                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 345                         break;
 346                 case Opt_pquota:
 347                 case Opt_prjquota:
 348                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 349                                          XFS_PQUOTA_ENFD);
 350                         break;
 351                 case Opt_pqnoenforce:
 352                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 353                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
 354                         break;
 355                 case Opt_gquota:
 356                 case Opt_grpquota:
 357                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 358                                          XFS_GQUOTA_ENFD);
 359                         break;
 360                 case Opt_gqnoenforce:
 361                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 362                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
 363                         break;
 364                 case Opt_discard:
 365                         mp->m_flags |= XFS_MOUNT_DISCARD;
 366                         break;
 367                 case Opt_nodiscard:
 368                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
 369                         break;
 370 #ifdef CONFIG_FS_DAX
 371                 case Opt_dax:
 372                         mp->m_flags |= XFS_MOUNT_DAX;
 373                         break;
 374 #endif
 375                 case Opt_barrier:
 376                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
 377                         mp->m_flags |= XFS_MOUNT_BARRIER;
 378                         break;
 379                 case Opt_nobarrier:
 380                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
 381                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
 382                         break;
 383                 default:
 384                         xfs_warn(mp, "unknown mount option [%s].", p);
 385                         return -EINVAL;
 386                 }
 387         }
 388
 389         /*
 390          * no recovery flag requires a read-only mount
 391          */
 392         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 393             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 394                 xfs_warn(mp, "no-recovery mounts must be read-only.");
 395                 return -EINVAL;
 396         }
 397
 398         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
 399                 xfs_warn(mp,
 400         "sunit and swidth options incompatible with the noalign option");
 401                 return -EINVAL;
 402         }
 403
 404 #ifndef CONFIG_XFS_QUOTA
 405         if (XFS_IS_QUOTA_RUNNING(mp)) {
 406                 xfs_warn(mp, "quota support not available in this kernel.");
 407                 return -EINVAL;
 408         }
 409 #endif
 410
 411         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 412                 xfs_warn(mp, "sunit and swidth must be specified together");
 413                 return -EINVAL;
 414         }
 415
 416         if (dsunit && (dswidth % dsunit != 0)) {
 417                 xfs_warn(mp,
 418         "stripe width (%d) must be a multiple of the stripe unit (%d)",
 419                         dswidth, dsunit);
 420                 return -EINVAL;
 421         }
 422
 423 done:
 424         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
 425                 /*
 426                  * At this point the superblock has not been read
 427                  * in, therefore we do not know the block size.
 428                  * Before the mount call ends we will convert
 429                  * these to FSBs.
 430                  */
 431                 mp->m_dalign = dsunit;
 432                 mp->m_swidth = dswidth;
 433         }
 434
 435         if (mp->m_logbufs != -1 &&
 436             mp->m_logbufs != 0 &&
 437             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 438              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 439                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 440                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 441                 return -EINVAL;
 442         }
 443         if (mp->m_logbsize != -1 &&
 444             mp->m_logbsize !=  0 &&
 445             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 446              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 447              !is_power_of_2(mp->m_logbsize))) {
 448                 xfs_warn(mp,
 449                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 450                         mp->m_logbsize);
 451                 return -EINVAL;
 452         }
 453
 454         if (iosizelog) {
 455                 if (iosizelog > XFS_MAX_IO_LOG ||
 456                     iosizelog < XFS_MIN_IO_LOG) {
 457                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 458                                 iosizelog, XFS_MIN_IO_LOG,
 459                                 XFS_MAX_IO_LOG);
 460                         return -EINVAL;
 461                 }
 462
 463                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 464                 mp->m_readio_log = iosizelog;
 465                 mp->m_writeio_log = iosizelog;
 466         }
 467
 468         return 0;
 469 }
 470
 471 struct proc_xfs_info {
 472         uint64_t        flag;
 473         char            *str;
 474 };
 475
 476 STATIC int
 477 xfs_showargs(
 478         struct xfs_mount        *mp,
 479         struct seq_file         *m)
 480 {
 481         static struct proc_xfs_info xfs_info_set[] = {
 482                 /* the few simple ones we can get from the mount struct */
 483                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 484                 { XFS_MOUNT_WSYNC,              ",wsync" },
 485                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 486                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 487                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 488                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 489                 { XFS_MOUNT_ATTR2,              ",attr2" },
 490                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 491                 { XFS_MOUNT_GRPID,              ",grpid" },
 492                 { XFS_MOUNT_DISCARD,            ",discard" },
 493                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
 494                 { XFS_MOUNT_DAX,                ",dax" },
 495                 { 0, NULL }
 496         };
 497         static struct proc_xfs_info xfs_info_unset[] = {
 498                 /* the few simple ones we can get from the mount struct */
 499                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
 500                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
 501                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
 502                 { 0, NULL }
 503         };
 504         struct proc_xfs_info    *xfs_infop;
 505
 506         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 507                 if (mp->m_flags & xfs_infop->flag)
 508                         seq_puts(m, xfs_infop->str);
 509         }
 510         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 511                 if (!(mp->m_flags & xfs_infop->flag))
 512                         seq_puts(m, xfs_infop->str);
 513         }
 514
 515         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 516                 seq_printf(m, ",allocsize=%dk",
 517                                 (int)(1 << mp->m_writeio_log) >> 10);
 518
 519         if (mp->m_logbufs > 0)
 520                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 521         if (mp->m_logbsize > 0)
 522                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 523
 524         if (mp->m_logname)
 525                 seq_show_option(m, "logdev", mp->m_logname);
 526         if (mp->m_rtname)
 527                 seq_show_option(m, "rtdev", mp->m_rtname);
 528
 529         if (mp->m_dalign > 0)
 530                 seq_printf(m, ",sunit=%d",
 531                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 532         if (mp->m_swidth > 0)
 533                 seq_printf(m, ",swidth=%d",
 534                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 535
 536         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 537                 seq_puts(m, ",usrquota");
 538         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 539                 seq_puts(m, ",uqnoenforce");
 540
 541         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 542                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 543                         seq_puts(m, ",prjquota");
 544                 else
 545                         seq_puts(m, ",pqnoenforce");
 546         }
 547         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 548                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 549                         seq_puts(m, ",grpquota");
 550                 else
 551                         seq_puts(m, ",gqnoenforce");
 552         }
 553
 554         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 555                 seq_puts(m, ",noquota");
 556
 557         return 0;
 558 }
 559 static uint64_t
 560 xfs_max_file_offset(
 561         unsigned int            blockshift)
 562 {
 563         unsigned int            pagefactor = 1;
 564         unsigned int            bitshift = BITS_PER_LONG - 1;
 565
 566         /* Figure out maximum filesize, on Linux this can depend on
 567          * the filesystem blocksize (on 32 bit platforms).
 568          * __block_write_begin does this in an [unsigned] long...
 569          *      page->index << (PAGE_SHIFT - bbits)
 570          * So, for page sized blocks (4K on 32 bit platforms),
 571          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 572          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
 573          * but for smaller blocksizes it is less (bbits = log2 bsize).
 574          * Note1: get_block_t takes a long (implicit cast from above)
 575          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 576          * can optionally convert the [unsigned] long from above into
 577          * an [unsigned] long long.
 578          */
 579
 580 #if BITS_PER_LONG == 32
 581 # if defined(CONFIG_LBDAF)
 582         ASSERT(sizeof(sector_t) == 8);
 583         pagefactor = PAGE_SIZE;
 584         bitshift = BITS_PER_LONG;
 585 # else
 586         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
 587 # endif
 588 #endif
 589
 590         return (((uint64_t)pagefactor) << bitshift) - 1;
 591 }
 592
 593 /*
 594  * Set parameters for inode allocation heuristics, taking into account
 595  * filesystem size and inode32/inode64 mount options; i.e. specifically
 596  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 597  *
 598  * Inode allocation patterns are altered only if inode32 is requested
 599  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 600  * If altered, XFS_MOUNT_32BITINODES is set as well.
 601  *
 602  * An agcount independent of that in the mount structure is provided
 603  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 604  * to the potentially higher ag count.
 605  *
 606  * Returns the maximum AG index which may contain inodes.
 607  */
 608 xfs_agnumber_t
 609 xfs_set_inode_alloc(
 610         struct xfs_mount *mp,
 611         xfs_agnumber_t  agcount)
 612 {
 613         xfs_agnumber_t  index;
 614         xfs_agnumber_t  maxagi = 0;
 615         xfs_sb_t        *sbp = &mp->m_sb;
 616         xfs_agnumber_t  max_metadata;
 617         xfs_agino_t     agino;
 618         xfs_ino_t       ino;
 619
 620         /*
 621          * Calculate how much should be reserved for inodes to meet
 622          * the max inode percentage.  Used only for inode32.
 623          */
 624         if (mp->m_maxicount) {
 625                 uint64_t        icount;
 626
 627                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 628                 do_div(icount, 100);
 629                 icount += sbp->sb_agblocks - 1;
 630                 do_div(icount, sbp->sb_agblocks);
 631                 max_metadata = icount;
 632         } else {
 633                 max_metadata = agcount;
 634         }
 635
 636         /* Get the last possible inode in the filesystem */
 637         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
 638         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 639
 640         /*
 641          * If user asked for no more than 32-bit inodes, and the fs is
 642          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 643          * the allocator to accommodate the request.
 644          */
 645         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 646                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 647         else
 648                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 649
 650         for (index = 0; index < agcount; index++) {
 651                 struct xfs_perag        *pag;
 652
 653                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 654
 655                 pag = xfs_perag_get(mp, index);
 656
 657                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 658                         if (ino > XFS_MAXINUMBER_32) {
 659                                 pag->pagi_inodeok = 0;
 660                                 pag->pagf_metadata = 0;
 661                         } else {
 662                                 pag->pagi_inodeok = 1;
 663                                 maxagi++;
 664                                 if (index < max_metadata)
 665                                         pag->pagf_metadata = 1;
 666                                 else
 667                                         pag->pagf_metadata = 0;
 668                         }
 669                 } else {
 670                         pag->pagi_inodeok = 1;
 671                         pag->pagf_metadata = 0;
 672                 }
 673
 674                 xfs_perag_put(pag);
 675         }
 676
 677         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 678 }
 679
 680 STATIC int
 681 xfs_blkdev_get(
 682         xfs_mount_t             *mp,
 683         const char              *name,
 684         struct block_device     **bdevp)
 685 {
 686         int                     error = 0;
 687
 688         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 689                                     mp);
 690         if (IS_ERR(*bdevp)) {
 691                 error = PTR_ERR(*bdevp);
 692                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 693         }
 694
 695         return error;
 696 }
 697
 698 STATIC void
 699 xfs_blkdev_put(
 700         struct block_device     *bdev)
 701 {
 702         if (bdev)
 703                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 704 }
 705
 706 void
 707 xfs_blkdev_issue_flush(
 708         xfs_buftarg_t           *buftarg)
 709 {
 710         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 711 }
 712
 713 STATIC void
 714 xfs_close_devices(
 715         struct xfs_mount        *mp)
 716 {
 717         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 718
 719         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 720                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 721                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 722
 723                 xfs_free_buftarg(mp, mp->m_logdev_targp);
 724                 xfs_blkdev_put(logdev);
 725                 fs_put_dax(dax_logdev);
 726         }
 727         if (mp->m_rtdev_targp) {
 728                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 729                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 730
 731                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
 732                 xfs_blkdev_put(rtdev);
 733                 fs_put_dax(dax_rtdev);
 734         }
 735         xfs_free_buftarg(mp, mp->m_ddev_targp);
 736         fs_put_dax(dax_ddev);
 737 }
 738
 739 /*
 740  * The file system configurations are:
 741  *      (1) device (partition) with data and internal log
 742  *      (2) logical volume with data and log subvolumes.
 743  *      (3) logical volume with data, log, and realtime subvolumes.
 744  *
 745  * We only have to handle opening the log and realtime volumes here if
 746  * they are present.  The data subvolume has already been opened by
 747  * get_sb_bdev() and is stored in sb->s_bdev.
 748  */
 749 STATIC int
 750 xfs_open_devices(
 751         struct xfs_mount        *mp)
 752 {
 753         struct block_device     *ddev = mp->m_super->s_bdev;
 754         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 755         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 756         struct block_device     *logdev = NULL, *rtdev = NULL;
 757         int                     error;
 758
 759         /*
 760          * Open real time and log devices - order is important.
 761          */
 762         if (mp->m_logname) {
 763                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 764                 if (error)
 765                         goto out;
 766                 dax_logdev = fs_dax_get_by_bdev(logdev);
 767         }
 768
 769         if (mp->m_rtname) {
 770                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 771                 if (error)
 772                         goto out_close_logdev;
 773
 774                 if (rtdev == ddev || rtdev == logdev) {
 775                         xfs_warn(mp,
 776         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 777                         error = -EINVAL;
 778                         goto out_close_rtdev;
 779                 }
 780                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 781         }
 782
 783         /*
 784          * Setup xfs_mount buffer target pointers
 785          */
 786         error = -ENOMEM;
 787         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 788         if (!mp->m_ddev_targp)
 789                 goto out_close_rtdev;
 790
 791         if (rtdev) {
 792                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 793                 if (!mp->m_rtdev_targp)
 794                         goto out_free_ddev_targ;
 795         }
 796
 797         if (logdev && logdev != ddev) {
 798                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 799                 if (!mp->m_logdev_targp)
 800                         goto out_free_rtdev_targ;
 801         } else {
 802                 mp->m_logdev_targp = mp->m_ddev_targp;
 803         }
 804
 805         return 0;
 806
 807  out_free_rtdev_targ:
 808         if (mp->m_rtdev_targp)
 809                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
 810  out_free_ddev_targ:
 811         xfs_free_buftarg(mp, mp->m_ddev_targp);
 812  out_close_rtdev:
 813         xfs_blkdev_put(rtdev);
 814         fs_put_dax(dax_rtdev);
 815  out_close_logdev:
 816         if (logdev && logdev != ddev) {
 817                 xfs_blkdev_put(logdev);
 818                 fs_put_dax(dax_logdev);
 819         }
 820  out:
 821         fs_put_dax(dax_ddev);
 822         return error;
 823 }
 824
 825 /*
 826  * Setup xfs_mount buffer target pointers based on superblock
 827  */
 828 STATIC int
 829 xfs_setup_devices(
 830         struct xfs_mount        *mp)
 831 {
 832         int                     error;
 833
 834         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 835         if (error)
 836                 return error;
 837
 838         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 839                 unsigned int    log_sector_size = BBSIZE;
 840
 841                 if (xfs_sb_version_hassector(&mp->m_sb))
 842                         log_sector_size = mp->m_sb.sb_logsectsize;
 843                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 844                                             log_sector_size);
 845                 if (error)
 846                         return error;
 847         }
 848         if (mp->m_rtdev_targp) {
 849                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 850                                             mp->m_sb.sb_sectsize);
 851                 if (error)
 852                         return error;
 853         }
 854
 855         return 0;
 856 }
 857
 858 STATIC int
 859 xfs_init_mount_workqueues(
 860         struct xfs_mount        *mp)
 861 {
 862         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 863                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
 864         if (!mp->m_buf_workqueue)
 865                 goto out;
 866
 867         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
 868                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 869         if (!mp->m_data_workqueue)
 870                 goto out_destroy_buf;
 871
 872         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 873                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 874         if (!mp->m_unwritten_workqueue)
 875                 goto out_destroy_data_iodone_queue;
 876
 877         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 878                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 879         if (!mp->m_cil_workqueue)
 880                 goto out_destroy_unwritten;
 881
 882         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 883                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 884         if (!mp->m_reclaim_workqueue)
 885                 goto out_destroy_cil;
 886
 887         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
 888                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
 889                         mp->m_fsname);
 890         if (!mp->m_log_workqueue)
 891                 goto out_destroy_reclaim;
 892
 893         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 894                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 895         if (!mp->m_eofblocks_workqueue)
 896                 goto out_destroy_log;
 897
 898         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 899                                                mp->m_fsname);
 900         if (!mp->m_sync_workqueue)
 901                 goto out_destroy_eofb;
 902
 903         return 0;
 904
 905 out_destroy_eofb:
 906         destroy_workqueue(mp->m_eofblocks_workqueue);
 907 out_destroy_log:
 908         destroy_workqueue(mp->m_log_workqueue);
 909 out_destroy_reclaim:
 910         destroy_workqueue(mp->m_reclaim_workqueue);
 911 out_destroy_cil:
 912         destroy_workqueue(mp->m_cil_workqueue);
 913 out_destroy_unwritten:
 914         destroy_workqueue(mp->m_unwritten_workqueue);
 915 out_destroy_data_iodone_queue:
 916         destroy_workqueue(mp->m_data_workqueue);
 917 out_destroy_buf:
 918         destroy_workqueue(mp->m_buf_workqueue);
 919 out:
 920         return -ENOMEM;
 921 }
 922
 923 STATIC void
 924 xfs_destroy_mount_workqueues(
 925         struct xfs_mount        *mp)
 926 {
 927         destroy_workqueue(mp->m_sync_workqueue);
 928         destroy_workqueue(mp->m_eofblocks_workqueue);
 929         destroy_workqueue(mp->m_log_workqueue);
 930         destroy_workqueue(mp->m_reclaim_workqueue);
 931         destroy_workqueue(mp->m_cil_workqueue);
 932         destroy_workqueue(mp->m_data_workqueue);
 933         destroy_workqueue(mp->m_unwritten_workqueue);
 934         destroy_workqueue(mp->m_buf_workqueue);
 935 }
 936
 937 /*
 938  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 939  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 940  * for IO to complete so that we effectively throttle multiple callers to the
 941  * rate at which IO is completing.
 942  */
 943 void
 944 xfs_flush_inodes(
 945         struct xfs_mount        *mp)
 946 {
 947         struct super_block      *sb = mp->m_super;
 948
 949         if (down_read_trylock(&sb->s_umount)) {
 950                 sync_inodes_sb(sb);
 951                 up_read(&sb->s_umount);
 952         }
 953 }
 954
 955 /* Catch misguided souls that try to use this interface on XFS */
 956 STATIC struct inode *
 957 xfs_fs_alloc_inode(
 958         struct super_block      *sb)
 959 {
 960         BUG();
 961         return NULL;
 962 }
 963
 964 /*
 965  * Now that the generic code is guaranteed not to be accessing
 966  * the linux inode, we can inactivate and reclaim the inode.
 967  */
 968 STATIC void
 969 xfs_fs_destroy_inode(
 970         struct inode            *inode)
 971 {
 972         struct xfs_inode        *ip = XFS_I(inode);
 973         int                     error;
 974
 975         trace_xfs_destroy_inode(ip);
 976
 977         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 978         XFS_STATS_INC(ip->i_mount, vn_rele);
 979         XFS_STATS_INC(ip->i_mount, vn_remove);
 980
 981         if (xfs_is_reflink_inode(ip)) {
 982                 error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
 983                 if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
 984                         xfs_warn(ip->i_mount,
 985 "Error %d while evicting CoW blocks for inode %llu.",
 986                                         error, ip->i_ino);
 987         }
 988
 989         xfs_inactive(ip);
 990
 991         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
 992         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 993
 994         /*
 995          * We should never get here with one of the reclaim flags already set.
 996          */
 997         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 998         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 999
1000         /*
1001          * We always use background reclaim here because even if the
1002          * inode is clean, it still may be under IO and hence we have
1003          * to take the flush lock. The background reclaim path handles
1004          * this more efficiently than we can here, so simply let background
1005          * reclaim tear down all inodes.
1006          */
1007         xfs_inode_set_reclaim_tag(ip);
1008 }
1009
1010 /*
1011  * Slab object creation initialisation for the XFS inode.
1012  * This covers only the idempotent fields in the XFS inode;
1013  * all other fields need to be initialised on allocation
1014  * from the slab. This avoids the need to repeatedly initialise
1015  * fields in the xfs inode that left in the initialise state
1016  * when freeing the inode.
1017  */
1018 STATIC void
1019 xfs_fs_inode_init_once(
1020         void                    *inode)
1021 {
1022         struct xfs_inode        *ip = inode;
1023
1024         memset(ip, 0, sizeof(struct xfs_inode));
1025
1026         /* vfs inode */
1027         inode_init_once(VFS_I(ip));
1028
1029         /* xfs inode */
1030         atomic_set(&ip->i_pincount, 0);
1031         spin_lock_init(&ip->i_flags_lock);
1032
1033         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1034                      "xfsino", ip->i_ino);
1035         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1036                      "xfsino", ip->i_ino);
1037 }
1038
1039 /*
1040  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1041  * serialised against cache hits here via the inode->i_lock and igrab() in
1042  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1043  * racing with us, and it avoids needing to grab a spinlock here for every inode
1044  * we drop the final reference on.
1045  */
1046 STATIC int
1047 xfs_fs_drop_inode(
1048         struct inode            *inode)
1049 {
1050         struct xfs_inode        *ip = XFS_I(inode);
1051
1052         /*
1053          * If this unlinked inode is in the middle of recovery, don't
1054          * drop the inode just yet; log recovery will take care of
1055          * that.  See the comment for this inode flag.
1056          */
1057         if (ip->i_flags & XFS_IRECOVERY) {
1058                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1059                 return 0;
1060         }
1061
1062         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1063 }
1064
1065 STATIC void
1066 xfs_free_fsname(
1067         struct xfs_mount        *mp)
1068 {
1069         kfree(mp->m_fsname);
1070         kfree(mp->m_rtname);
1071         kfree(mp->m_logname);
1072 }
1073
1074 STATIC int
1075 xfs_fs_sync_fs(
1076         struct super_block      *sb,
1077         int                     wait)
1078 {
1079         struct xfs_mount        *mp = XFS_M(sb);
1080
1081         /*
1082          * Doing anything during the async pass would be counterproductive.
1083          */
1084         if (!wait)
1085                 return 0;
1086
1087         xfs_log_force(mp, XFS_LOG_SYNC);
1088         if (laptop_mode) {
1089                 /*
1090                  * The disk must be active because we're syncing.
1091                  * We schedule log work now (now that the disk is
1092                  * active) instead of later (when it might not be).
1093                  */
1094                 flush_delayed_work(&mp->m_log->l_work);
1095         }
1096
1097         return 0;
1098 }
1099
1100 STATIC int
1101 xfs_fs_statfs(
1102         struct dentry           *dentry,
1103         struct kstatfs          *statp)
1104 {
1105         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1106         xfs_sb_t                *sbp = &mp->m_sb;
1107         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1108         uint64_t                fakeinos, id;
1109         uint64_t                icount;
1110         uint64_t                ifree;
1111         uint64_t                fdblocks;
1112         xfs_extlen_t            lsize;
1113         int64_t                 ffree;
1114
1115         statp->f_type = XFS_SB_MAGIC;
1116         statp->f_namelen = MAXNAMELEN - 1;
1117
1118         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1119         statp->f_fsid.val[0] = (u32)id;
1120         statp->f_fsid.val[1] = (u32)(id >> 32);
1121
1122         icount = percpu_counter_sum(&mp->m_icount);
1123         ifree = percpu_counter_sum(&mp->m_ifree);
1124         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1125
1126         spin_lock(&mp->m_sb_lock);
1127         statp->f_bsize = sbp->sb_blocksize;
1128         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1129         statp->f_blocks = sbp->sb_dblocks - lsize;
1130         spin_unlock(&mp->m_sb_lock);
1131
1132         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1133         statp->f_bavail = statp->f_bfree;
1134
1135         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1136         statp->f_files = MIN(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
1137         if (mp->m_maxicount)
1138                 statp->f_files = min_t(typeof(statp->f_files),
1139                                         statp->f_files,
1140                                         mp->m_maxicount);
1141
1142         /* If sb_icount overshot maxicount, report actual allocation */
1143         statp->f_files = max_t(typeof(statp->f_files),
1144                                         statp->f_files,
1145                                         sbp->sb_icount);
1146
1147         /* make sure statp->f_ffree does not underflow */
1148         ffree = statp->f_files - (icount - ifree);
1149         statp->f_ffree = max_t(int64_t, ffree, 0);
1150
1151
1152         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1153             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1154                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1155                 xfs_qm_statvfs(ip, statp);
1156         return 0;
1157 }
1158
1159 STATIC void
1160 xfs_save_resvblks(struct xfs_mount *mp)
1161 {
1162         uint64_t resblks = 0;
1163
1164         mp->m_resblks_save = mp->m_resblks;
1165         xfs_reserve_blocks(mp, &resblks, NULL);
1166 }
1167
1168 STATIC void
1169 xfs_restore_resvblks(struct xfs_mount *mp)
1170 {
1171         uint64_t resblks;
1172
1173         if (mp->m_resblks_save) {
1174                 resblks = mp->m_resblks_save;
1175                 mp->m_resblks_save = 0;
1176         } else
1177                 resblks = xfs_default_resblks(mp);
1178
1179         xfs_reserve_blocks(mp, &resblks, NULL);
1180 }
1181
1182 /*
1183  * Trigger writeback of all the dirty metadata in the file system.
1184  *
1185  * This ensures that the metadata is written to their location on disk rather
1186  * than just existing in transactions in the log. This means after a quiesce
1187  * there is no log replay required to write the inodes to disk - this is the
1188  * primary difference between a sync and a quiesce.
1189  *
1190  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1191  * it is started again when appropriate.
1192  */
1193 void
1194 xfs_quiesce_attr(
1195         struct xfs_mount        *mp)
1196 {
1197         int     error = 0;
1198
1199         /* wait for all modifications to complete */
1200         while (atomic_read(&mp->m_active_trans) > 0)
1201                 delay(100);
1202
1203         /* force the log to unpin objects from the now complete transactions */
1204         xfs_log_force(mp, XFS_LOG_SYNC);
1205
1206         /* reclaim inodes to do any IO before the freeze completes */
1207         xfs_reclaim_inodes(mp, 0);
1208         xfs_reclaim_inodes(mp, SYNC_WAIT);
1209
1210         /* Push the superblock and write an unmount record */
1211         error = xfs_log_sbcount(mp);
1212         if (error)
1213                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1214                                 "Frozen image may not be consistent.");
1215         /*
1216          * Just warn here till VFS can correctly support
1217          * read-only remount without racing.
1218          */
1219         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1220
1221         xfs_log_quiesce(mp);
1222 }
1223
1224 STATIC int
1225 xfs_test_remount_options(
1226         struct super_block      *sb,
1227         struct xfs_mount        *mp,
1228         char                    *options)
1229 {
1230         int                     error = 0;
1231         struct xfs_mount        *tmp_mp;
1232
1233         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1234         if (!tmp_mp)
1235                 return -ENOMEM;
1236
1237         tmp_mp->m_super = sb;
1238         error = xfs_parseargs(tmp_mp, options);
1239         xfs_free_fsname(tmp_mp);
1240         kmem_free(tmp_mp);
1241
1242         return error;
1243 }
1244
1245 STATIC int
1246 xfs_fs_remount(
1247         struct super_block      *sb,
1248         int                     *flags,
1249         char                    *options)
1250 {
1251         struct xfs_mount        *mp = XFS_M(sb);
1252         xfs_sb_t                *sbp = &mp->m_sb;
1253         substring_t             args[MAX_OPT_ARGS];
1254         char                    *p;
1255         int                     error;
1256
1257         /* First, check for complete junk; i.e. invalid options */
1258         error = xfs_test_remount_options(sb, mp, options);
1259         if (error)
1260                 return error;
1261
1262         sync_filesystem(sb);
1263         while ((p = strsep(&options, ",")) != NULL) {
1264                 int token;
1265
1266                 if (!*p)
1267                         continue;
1268
1269                 token = match_token(p, tokens, args);
1270                 switch (token) {
1271                 case Opt_barrier:
1272                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1273                         mp->m_flags |= XFS_MOUNT_BARRIER;
1274                         break;
1275                 case Opt_nobarrier:
1276                         xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1277                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1278                         break;
1279                 case Opt_inode64:
1280                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1281                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1282                         break;
1283                 case Opt_inode32:
1284                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1285                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1286                         break;
1287                 default:
1288                         /*
1289                          * Logically we would return an error here to prevent
1290                          * users from believing they might have changed
1291                          * mount options using remount which can't be changed.
1292                          *
1293                          * But unfortunately mount(8) adds all options from
1294                          * mtab and fstab to the mount arguments in some cases
1295                          * so we can't blindly reject options, but have to
1296                          * check for each specified option if it actually
1297                          * differs from the currently set option and only
1298                          * reject it if that's the case.
1299                          *
1300                          * Until that is implemented we return success for
1301                          * every remount request, and silently ignore all
1302                          * options that we can't actually change.
1303                          */
1304 #if 0
1305                         xfs_info(mp,
1306                 "mount option \"%s\" not supported for remount", p);
1307                         return -EINVAL;
1308 #else
1309                         break;
1310 #endif
1311                 }
1312         }
1313
1314         /* ro -> rw */
1315         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1316                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1317                         xfs_warn(mp,
1318                 "ro->rw transition prohibited on norecovery mount");
1319                         return -EINVAL;
1320                 }
1321
1322                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1323                     xfs_sb_has_ro_compat_feature(sbp,
1324                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1325                         xfs_warn(mp,
1326 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1327                                 (sbp->sb_features_ro_compat &
1328                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1329                         return -EINVAL;
1330                 }
1331
1332                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1333
1334                 /*
1335                  * If this is the first remount to writeable state we
1336                  * might have some superblock changes to update.
1337                  */
1338                 if (mp->m_update_sb) {
1339                         error = xfs_sync_sb(mp, false);
1340                         if (error) {
1341                                 xfs_warn(mp, "failed to write sb changes");
1342                                 return error;
1343                         }
1344                         mp->m_update_sb = false;
1345                 }
1346
1347                 /*
1348                  * Fill out the reserve pool if it is empty. Use the stashed
1349                  * value if it is non-zero, otherwise go with the default.
1350                  */
1351                 xfs_restore_resvblks(mp);
1352                 xfs_log_work_queue(mp);
1353                 xfs_queue_eofblocks(mp);
1354
1355                 /* Recover any CoW blocks that never got remapped. */
1356                 error = xfs_reflink_recover_cow(mp);
1357                 if (error) {
1358                         xfs_err(mp,
1359         "Error %d recovering leftover CoW allocations.", error);
1360                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1361                         return error;
1362                 }
1363
1364                 /* Create the per-AG metadata reservation pool .*/
1365                 error = xfs_fs_reserve_ag_blocks(mp);
1366                 if (error && error != -ENOSPC)
1367                         return error;
1368         }
1369
1370         /* rw -> ro */
1371         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1372                 /* Free the per-AG metadata reservation pool. */
1373                 error = xfs_fs_unreserve_ag_blocks(mp);
1374                 if (error) {
1375                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1376                         return error;
1377                 }
1378
1379                 /*
1380                  * Before we sync the metadata, we need to free up the reserve
1381                  * block pool so that the used block count in the superblock on
1382                  * disk is correct at the end of the remount. Stash the current
1383                  * reserve pool size so that if we get remounted rw, we can
1384                  * return it to the same size.
1385                  */
1386                 xfs_save_resvblks(mp);
1387
1388                 /*
1389                  * Cancel background eofb scanning so it cannot race with the
1390                  * final log force+buftarg wait and deadlock the remount.
1391                  */
1392                 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1393
1394                 xfs_quiesce_attr(mp);
1395                 mp->m_flags |= XFS_MOUNT_RDONLY;
1396         }
1397
1398         return 0;
1399 }
1400
1401 /*
1402  * Second stage of a freeze. The data is already frozen so we only
1403  * need to take care of the metadata. Once that's done sync the superblock
1404  * to the log to dirty it in case of a crash while frozen. This ensures that we
1405  * will recover the unlinked inode lists on the next mount.
1406  */
1407 STATIC int
1408 xfs_fs_freeze(
1409         struct super_block      *sb)
1410 {
1411         struct xfs_mount        *mp = XFS_M(sb);
1412
1413         xfs_save_resvblks(mp);
1414         xfs_quiesce_attr(mp);
1415         return xfs_sync_sb(mp, true);
1416 }
1417
1418 STATIC int
1419 xfs_fs_unfreeze(
1420         struct super_block      *sb)
1421 {
1422         struct xfs_mount        *mp = XFS_M(sb);
1423
1424         xfs_restore_resvblks(mp);
1425         xfs_log_work_queue(mp);
1426         return 0;
1427 }
1428
1429 STATIC int
1430 xfs_fs_show_options(
1431         struct seq_file         *m,
1432         struct dentry           *root)
1433 {
1434         return xfs_showargs(XFS_M(root->d_sb), m);
1435 }
1436
1437 /*
1438  * This function fills in xfs_mount_t fields based on mount args.
1439  * Note: the superblock _has_ now been read in.
1440  */
1441 STATIC int
1442 xfs_finish_flags(
1443         struct xfs_mount        *mp)
1444 {
1445         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1446
1447         /* Fail a mount where the logbuf is smaller than the log stripe */
1448         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1449                 if (mp->m_logbsize <= 0 &&
1450                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1451                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1452                 } else if (mp->m_logbsize > 0 &&
1453                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1454                         xfs_warn(mp,
1455                 "logbuf size must be greater than or equal to log stripe size");
1456                         return -EINVAL;
1457                 }
1458         } else {
1459                 /* Fail a mount if the logbuf is larger than 32K */
1460                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1461                         xfs_warn(mp,
1462                 "logbuf size for version 1 logs must be 16K or 32K");
1463                         return -EINVAL;
1464                 }
1465         }
1466
1467         /*
1468          * V5 filesystems always use attr2 format for attributes.
1469          */
1470         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1471             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1472                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1473                              "attr2 is always enabled for V5 filesystems.");
1474                 return -EINVAL;
1475         }
1476
1477         /*
1478          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1479          * told by noattr2 to turn it off
1480          */
1481         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1482             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1483                 mp->m_flags |= XFS_MOUNT_ATTR2;
1484
1485         /*
1486          * prohibit r/w mounts of read-only filesystems
1487          */
1488         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1489                 xfs_warn(mp,
1490                         "cannot mount a read-only filesystem as read-write");
1491                 return -EROFS;
1492         }
1493
1494         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1495             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1496             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1497                 xfs_warn(mp,
1498                   "Super block does not support project and group quota together");
1499                 return -EINVAL;
1500         }
1501
1502         return 0;
1503 }
1504
1505 static int
1506 xfs_init_percpu_counters(
1507         struct xfs_mount        *mp)
1508 {
1509         int             error;
1510
1511         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1512         if (error)
1513                 return -ENOMEM;
1514
1515         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1516         if (error)
1517                 goto free_icount;
1518
1519         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1520         if (error)
1521                 goto free_ifree;
1522
1523         return 0;
1524
1525 free_ifree:
1526         percpu_counter_destroy(&mp->m_ifree);
1527 free_icount:
1528         percpu_counter_destroy(&mp->m_icount);
1529         return -ENOMEM;
1530 }
1531
1532 void
1533 xfs_reinit_percpu_counters(
1534         struct xfs_mount        *mp)
1535 {
1536         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1537         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1538         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1539 }
1540
1541 static void
1542 xfs_destroy_percpu_counters(
1543         struct xfs_mount        *mp)
1544 {
1545         percpu_counter_destroy(&mp->m_icount);
1546         percpu_counter_destroy(&mp->m_ifree);
1547         percpu_counter_destroy(&mp->m_fdblocks);
1548 }
1549
1550 STATIC int
1551 xfs_fs_fill_super(
1552         struct super_block      *sb,
1553         void                    *data,
1554         int                     silent)
1555 {
1556         struct inode            *root;
1557         struct xfs_mount        *mp = NULL;
1558         int                     flags = 0, error = -ENOMEM;
1559
1560         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1561         if (!mp)
1562                 goto out;
1563
1564         spin_lock_init(&mp->m_sb_lock);
1565         mutex_init(&mp->m_growlock);
1566         atomic_set(&mp->m_active_trans, 0);
1567         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1568         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1569         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1570         mp->m_kobj.kobject.kset = xfs_kset;
1571
1572         mp->m_super = sb;
1573         sb->s_fs_info = mp;
1574
1575         error = xfs_parseargs(mp, (char *)data);
1576         if (error)
1577                 goto out_free_fsname;
1578
1579         sb_min_blocksize(sb, BBSIZE);
1580         sb->s_xattr = xfs_xattr_handlers;
1581         sb->s_export_op = &xfs_export_operations;
1582 #ifdef CONFIG_XFS_QUOTA
1583         sb->s_qcop = &xfs_quotactl_operations;
1584         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1585 #endif
1586         sb->s_op = &xfs_super_operations;
1587
1588         if (silent)
1589                 flags |= XFS_MFSI_QUIET;
1590
1591         error = xfs_open_devices(mp);
1592         if (error)
1593                 goto out_free_fsname;
1594
1595         error = xfs_init_mount_workqueues(mp);
1596         if (error)
1597                 goto out_close_devices;
1598
1599         error = xfs_init_percpu_counters(mp);
1600         if (error)
1601                 goto out_destroy_workqueues;
1602
1603         /* Allocate stats memory before we do operations that might use it */
1604         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1605         if (!mp->m_stats.xs_stats) {
1606                 error = -ENOMEM;
1607                 goto out_destroy_counters;
1608         }
1609
1610         error = xfs_readsb(mp, flags);
1611         if (error)
1612                 goto out_free_stats;
1613
1614         error = xfs_finish_flags(mp);
1615         if (error)
1616                 goto out_free_sb;
1617
1618         error = xfs_setup_devices(mp);
1619         if (error)
1620                 goto out_free_sb;
1621
1622         error = xfs_filestream_mount(mp);
1623         if (error)
1624                 goto out_free_sb;
1625
1626         /*
1627          * we must configure the block size in the superblock before we run the
1628          * full mount process as the mount process can lookup and cache inodes.
1629          */
1630         sb->s_magic = XFS_SB_MAGIC;
1631         sb->s_blocksize = mp->m_sb.sb_blocksize;
1632         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1633         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1634         sb->s_max_links = XFS_MAXLINK;
1635         sb->s_time_gran = 1;
1636         set_posix_acl_flag(sb);
1637
1638         /* version 5 superblocks support inode version counters. */
1639         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1640                 sb->s_flags |= SB_I_VERSION;
1641
1642         if (mp->m_flags & XFS_MOUNT_DAX) {
1643                 bool rtdev_is_dax = false, datadev_is_dax;
1644
1645                 xfs_warn(mp,
1646                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1647
1648                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1649                         sb->s_blocksize);
1650                 if (mp->m_rtdev_targp)
1651                         rtdev_is_dax = bdev_dax_supported(
1652                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1653                 if (!rtdev_is_dax && !datadev_is_dax) {
1654                         xfs_alert(mp,
1655                         "DAX unsupported by block device. Turning off DAX.");
1656                         mp->m_flags &= ~XFS_MOUNT_DAX;
1657                 }
1658                 if (xfs_sb_version_hasreflink(&mp->m_sb))
1659                         xfs_alert(mp,
1660                 "DAX and reflink have not been tested together!");
1661         }
1662
1663         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1664                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1665
1666                 if (!blk_queue_discard(q)) {
1667                         xfs_warn(mp, "mounting with \"discard\" option, but "
1668                                         "the device does not support discard");
1669                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1670                 }
1671         }
1672
1673         if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
1674                 if (mp->m_sb.sb_rblocks) {
1675                         xfs_alert(mp,
1676         "EXPERIMENTAL reverse mapping btree not compatible with realtime device!");
1677                         error = -EINVAL;
1678                         goto out_filestream_unmount;
1679                 }
1680                 xfs_alert(mp,
1681         "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
1682         }
1683
1684         if (xfs_sb_version_hasreflink(&mp->m_sb))
1685                 xfs_alert(mp,
1686         "EXPERIMENTAL reflink feature enabled. Use at your own risk!");
1687
1688         error = xfs_mountfs(mp);
1689         if (error)
1690                 goto out_filestream_unmount;
1691
1692         root = igrab(VFS_I(mp->m_rootip));
1693         if (!root) {
1694                 error = -ENOENT;
1695                 goto out_unmount;
1696         }
1697         sb->s_root = d_make_root(root);
1698         if (!sb->s_root) {
1699                 error = -ENOMEM;
1700                 goto out_unmount;
1701         }
1702
1703         return 0;
1704
1705  out_filestream_unmount:
1706         xfs_filestream_unmount(mp);
1707  out_free_sb:
1708         xfs_freesb(mp);
1709  out_free_stats:
1710         free_percpu(mp->m_stats.xs_stats);
1711  out_destroy_counters:
1712         xfs_destroy_percpu_counters(mp);
1713  out_destroy_workqueues:
1714         xfs_destroy_mount_workqueues(mp);
1715  out_close_devices:
1716         xfs_close_devices(mp);
1717  out_free_fsname:
1718         sb->s_fs_info = NULL;
1719         xfs_free_fsname(mp);
1720         kfree(mp);
1721  out:
1722         return error;
1723
1724  out_unmount:
1725         xfs_filestream_unmount(mp);
1726         xfs_unmountfs(mp);
1727         goto out_free_sb;
1728 }
1729
1730 STATIC void
1731 xfs_fs_put_super(
1732         struct super_block      *sb)
1733 {
1734         struct xfs_mount        *mp = XFS_M(sb);
1735
1736         /* if ->fill_super failed, we have no mount to tear down */
1737         if (!sb->s_fs_info)
1738                 return;
1739
1740         xfs_notice(mp, "Unmounting Filesystem");
1741         xfs_filestream_unmount(mp);
1742         xfs_unmountfs(mp);
1743
1744         xfs_freesb(mp);
1745         free_percpu(mp->m_stats.xs_stats);
1746         xfs_destroy_percpu_counters(mp);
1747         xfs_destroy_mount_workqueues(mp);
1748         xfs_close_devices(mp);
1749
1750         sb->s_fs_info = NULL;
1751         xfs_free_fsname(mp);
1752         kfree(mp);
1753 }
1754
1755 STATIC struct dentry *
1756 xfs_fs_mount(
1757         struct file_system_type *fs_type,
1758         int                     flags,
1759         const char              *dev_name,
1760         void                    *data)
1761 {
1762         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1763 }
1764
1765 static long
1766 xfs_fs_nr_cached_objects(
1767         struct super_block      *sb,
1768         struct shrink_control   *sc)
1769 {
1770         /* Paranoia: catch incorrect calls during mount setup or teardown */
1771         if (WARN_ON_ONCE(!sb->s_fs_info))
1772                 return 0;
1773         return xfs_reclaim_inodes_count(XFS_M(sb));
1774 }
1775
1776 static long
1777 xfs_fs_free_cached_objects(
1778         struct super_block      *sb,
1779         struct shrink_control   *sc)
1780 {
1781         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1782 }
1783
1784 static const struct super_operations xfs_super_operations = {
1785         .alloc_inode            = xfs_fs_alloc_inode,
1786         .destroy_inode          = xfs_fs_destroy_inode,
1787         .drop_inode             = xfs_fs_drop_inode,
1788         .put_super              = xfs_fs_put_super,
1789         .sync_fs                = xfs_fs_sync_fs,
1790         .freeze_fs              = xfs_fs_freeze,
1791         .unfreeze_fs            = xfs_fs_unfreeze,
1792         .statfs                 = xfs_fs_statfs,
1793         .remount_fs             = xfs_fs_remount,
1794         .show_options           = xfs_fs_show_options,
1795         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1796         .free_cached_objects    = xfs_fs_free_cached_objects,
1797 };
1798
1799 static struct file_system_type xfs_fs_type = {
1800         .owner                  = THIS_MODULE,
1801         .name                   = "xfs",
1802         .mount                  = xfs_fs_mount,
1803         .kill_sb                = kill_block_super,
1804         .fs_flags               = FS_REQUIRES_DEV,
1805 };
1806 MODULE_ALIAS_FS("xfs");
1807
1808 STATIC int __init
1809 xfs_init_zones(void)
1810 {
1811         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1812                         offsetof(struct xfs_ioend, io_inline_bio),
1813                         BIOSET_NEED_BVECS);
1814         if (!xfs_ioend_bioset)
1815                 goto out;
1816
1817         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1818                                                 "xfs_log_ticket");
1819         if (!xfs_log_ticket_zone)
1820                 goto out_free_ioend_bioset;
1821
1822         xfs_bmap_free_item_zone = kmem_zone_init(
1823                         sizeof(struct xfs_extent_free_item),
1824                         "xfs_bmap_free_item");
1825         if (!xfs_bmap_free_item_zone)
1826                 goto out_destroy_log_ticket_zone;
1827
1828         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1829                                                 "xfs_btree_cur");
1830         if (!xfs_btree_cur_zone)
1831                 goto out_destroy_bmap_free_item_zone;
1832
1833         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1834                                                 "xfs_da_state");
1835         if (!xfs_da_state_zone)
1836                 goto out_destroy_btree_cur_zone;
1837
1838         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1839         if (!xfs_ifork_zone)
1840                 goto out_destroy_da_state_zone;
1841
1842         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1843         if (!xfs_trans_zone)
1844                 goto out_destroy_ifork_zone;
1845
1846         xfs_log_item_desc_zone =
1847                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1848                                "xfs_log_item_desc");
1849         if (!xfs_log_item_desc_zone)
1850                 goto out_destroy_trans_zone;
1851
1852         /*
1853          * The size of the zone allocated buf log item is the maximum
1854          * size possible under XFS.  This wastes a little bit of memory,
1855          * but it is much faster.
1856          */
1857         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1858                                            "xfs_buf_item");
1859         if (!xfs_buf_item_zone)
1860                 goto out_destroy_log_item_desc_zone;
1861
1862         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1863                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1864                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1865         if (!xfs_efd_zone)
1866                 goto out_destroy_buf_item_zone;
1867
1868         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1869                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1870                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1871         if (!xfs_efi_zone)
1872                 goto out_destroy_efd_zone;
1873
1874         xfs_inode_zone =
1875                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1876                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1877                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1878         if (!xfs_inode_zone)
1879                 goto out_destroy_efi_zone;
1880
1881         xfs_ili_zone =
1882                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1883                                         KM_ZONE_SPREAD, NULL);
1884         if (!xfs_ili_zone)
1885                 goto out_destroy_inode_zone;
1886         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1887                                         "xfs_icr");
1888         if (!xfs_icreate_zone)
1889                 goto out_destroy_ili_zone;
1890
1891         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1892                         "xfs_rud_item");
1893         if (!xfs_rud_zone)
1894                 goto out_destroy_icreate_zone;
1895
1896         xfs_rui_zone = kmem_zone_init(
1897                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1898                         "xfs_rui_item");
1899         if (!xfs_rui_zone)
1900                 goto out_destroy_rud_zone;
1901
1902         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1903                         "xfs_cud_item");
1904         if (!xfs_cud_zone)
1905                 goto out_destroy_rui_zone;
1906
1907         xfs_cui_zone = kmem_zone_init(
1908                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1909                         "xfs_cui_item");
1910         if (!xfs_cui_zone)
1911                 goto out_destroy_cud_zone;
1912
1913         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1914                         "xfs_bud_item");
1915         if (!xfs_bud_zone)
1916                 goto out_destroy_cui_zone;
1917
1918         xfs_bui_zone = kmem_zone_init(
1919                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1920                         "xfs_bui_item");
1921         if (!xfs_bui_zone)
1922                 goto out_destroy_bud_zone;
1923
1924         return 0;
1925
1926  out_destroy_bud_zone:
1927         kmem_zone_destroy(xfs_bud_zone);
1928  out_destroy_cui_zone:
1929         kmem_zone_destroy(xfs_cui_zone);
1930  out_destroy_cud_zone:
1931         kmem_zone_destroy(xfs_cud_zone);
1932  out_destroy_rui_zone:
1933         kmem_zone_destroy(xfs_rui_zone);
1934  out_destroy_rud_zone:
1935         kmem_zone_destroy(xfs_rud_zone);
1936  out_destroy_icreate_zone:
1937         kmem_zone_destroy(xfs_icreate_zone);
1938  out_destroy_ili_zone:
1939         kmem_zone_destroy(xfs_ili_zone);
1940  out_destroy_inode_zone:
1941         kmem_zone_destroy(xfs_inode_zone);
1942  out_destroy_efi_zone:
1943         kmem_zone_destroy(xfs_efi_zone);
1944  out_destroy_efd_zone:
1945         kmem_zone_destroy(xfs_efd_zone);
1946  out_destroy_buf_item_zone:
1947         kmem_zone_destroy(xfs_buf_item_zone);
1948  out_destroy_log_item_desc_zone:
1949         kmem_zone_destroy(xfs_log_item_desc_zone);
1950  out_destroy_trans_zone:
1951         kmem_zone_destroy(xfs_trans_zone);
1952  out_destroy_ifork_zone:
1953         kmem_zone_destroy(xfs_ifork_zone);
1954  out_destroy_da_state_zone:
1955         kmem_zone_destroy(xfs_da_state_zone);
1956  out_destroy_btree_cur_zone:
1957         kmem_zone_destroy(xfs_btree_cur_zone);
1958  out_destroy_bmap_free_item_zone:
1959         kmem_zone_destroy(xfs_bmap_free_item_zone);
1960  out_destroy_log_ticket_zone:
1961         kmem_zone_destroy(xfs_log_ticket_zone);
1962  out_free_ioend_bioset:
1963         bioset_free(xfs_ioend_bioset);
1964  out:
1965         return -ENOMEM;
1966 }
1967
1968 STATIC void
1969 xfs_destroy_zones(void)
1970 {
1971         /*
1972          * Make sure all delayed rcu free are flushed before we
1973          * destroy caches.
1974          */
1975         rcu_barrier();
1976         kmem_zone_destroy(xfs_bui_zone);
1977         kmem_zone_destroy(xfs_bud_zone);
1978         kmem_zone_destroy(xfs_cui_zone);
1979         kmem_zone_destroy(xfs_cud_zone);
1980         kmem_zone_destroy(xfs_rui_zone);
1981         kmem_zone_destroy(xfs_rud_zone);
1982         kmem_zone_destroy(xfs_icreate_zone);
1983         kmem_zone_destroy(xfs_ili_zone);
1984         kmem_zone_destroy(xfs_inode_zone);
1985         kmem_zone_destroy(xfs_efi_zone);
1986         kmem_zone_destroy(xfs_efd_zone);
1987         kmem_zone_destroy(xfs_buf_item_zone);
1988         kmem_zone_destroy(xfs_log_item_desc_zone);
1989         kmem_zone_destroy(xfs_trans_zone);
1990         kmem_zone_destroy(xfs_ifork_zone);
1991         kmem_zone_destroy(xfs_da_state_zone);
1992         kmem_zone_destroy(xfs_btree_cur_zone);
1993         kmem_zone_destroy(xfs_bmap_free_item_zone);
1994         kmem_zone_destroy(xfs_log_ticket_zone);
1995         bioset_free(xfs_ioend_bioset);
1996 }
1997
1998 STATIC int __init
1999 xfs_init_workqueues(void)
2000 {
2001         /*
2002          * The allocation workqueue can be used in memory reclaim situations
2003          * (writepage path), and parallelism is only limited by the number of
2004          * AGs in all the filesystems mounted. Hence use the default large
2005          * max_active value for this workqueue.
2006          */
2007         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2008                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2009         if (!xfs_alloc_wq)
2010                 return -ENOMEM;
2011
2012         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2013         if (!xfs_discard_wq)
2014                 goto out_free_alloc_wq;
2015
2016         return 0;
2017 out_free_alloc_wq:
2018         destroy_workqueue(xfs_alloc_wq);
2019         return -ENOMEM;
2020 }
2021
2022 STATIC void
2023 xfs_destroy_workqueues(void)
2024 {
2025         destroy_workqueue(xfs_discard_wq);
2026         destroy_workqueue(xfs_alloc_wq);
2027 }
2028
2029 STATIC int __init
2030 init_xfs_fs(void)
2031 {
2032         int                     error;
2033
2034         xfs_check_ondisk_structs();
2035
2036         printk(KERN_INFO XFS_VERSION_STRING " with "
2037                          XFS_BUILD_OPTIONS " enabled\n");
2038
2039         xfs_extent_free_init_defer_op();
2040         xfs_rmap_update_init_defer_op();
2041         xfs_refcount_update_init_defer_op();
2042         xfs_bmap_update_init_defer_op();
2043
2044         xfs_dir_startup();
2045
2046         error = xfs_init_zones();
2047         if (error)
2048                 goto out;
2049
2050         error = xfs_init_workqueues();
2051         if (error)
2052                 goto out_destroy_zones;
2053
2054         error = xfs_mru_cache_init();
2055         if (error)
2056                 goto out_destroy_wq;
2057
2058         error = xfs_buf_init();
2059         if (error)
2060                 goto out_mru_cache_uninit;
2061
2062         error = xfs_init_procfs();
2063         if (error)
2064                 goto out_buf_terminate;
2065
2066         error = xfs_sysctl_register();
2067         if (error)
2068                 goto out_cleanup_procfs;
2069
2070         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2071         if (!xfs_kset) {
2072                 error = -ENOMEM;
2073                 goto out_sysctl_unregister;
2074         }
2075
2076         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2077
2078         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2079         if (!xfsstats.xs_stats) {
2080                 error = -ENOMEM;
2081                 goto out_kset_unregister;
2082         }
2083
2084         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2085                                "stats");
2086         if (error)
2087                 goto out_free_stats;
2088
2089 #ifdef DEBUG
2090         xfs_dbg_kobj.kobject.kset = xfs_kset;
2091         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2092         if (error)
2093                 goto out_remove_stats_kobj;
2094 #endif
2095
2096         error = xfs_qm_init();
2097         if (error)
2098                 goto out_remove_dbg_kobj;
2099
2100         error = register_filesystem(&xfs_fs_type);
2101         if (error)
2102                 goto out_qm_exit;
2103         return 0;
2104
2105  out_qm_exit:
2106         xfs_qm_exit();
2107  out_remove_dbg_kobj:
2108 #ifdef DEBUG
2109         xfs_sysfs_del(&xfs_dbg_kobj);
2110  out_remove_stats_kobj:
2111 #endif
2112         xfs_sysfs_del(&xfsstats.xs_kobj);
2113  out_free_stats:
2114         free_percpu(xfsstats.xs_stats);
2115  out_kset_unregister:
2116         kset_unregister(xfs_kset);
2117  out_sysctl_unregister:
2118         xfs_sysctl_unregister();
2119  out_cleanup_procfs:
2120         xfs_cleanup_procfs();
2121  out_buf_terminate:
2122         xfs_buf_terminate();
2123  out_mru_cache_uninit:
2124         xfs_mru_cache_uninit();
2125  out_destroy_wq:
2126         xfs_destroy_workqueues();
2127  out_destroy_zones:
2128         xfs_destroy_zones();
2129  out:
2130         return error;
2131 }
2132
2133 STATIC void __exit
2134 exit_xfs_fs(void)
2135 {
2136         xfs_qm_exit();
2137         unregister_filesystem(&xfs_fs_type);
2138 #ifdef DEBUG
2139         xfs_sysfs_del(&xfs_dbg_kobj);
2140 #endif
2141         xfs_sysfs_del(&xfsstats.xs_kobj);
2142         free_percpu(xfsstats.xs_stats);
2143         kset_unregister(xfs_kset);
2144         xfs_sysctl_unregister();
2145         xfs_cleanup_procfs();
2146         xfs_buf_terminate();
2147         xfs_mru_cache_uninit();
2148         xfs_destroy_workqueues();
2149         xfs_destroy_zones();
2150         xfs_uuid_table_free();
2151 }
2152
2153 module_init(init_xfs_fs);
2154 module_exit(exit_xfs_fs);
2155
2156 MODULE_AUTHOR("Silicon Graphics, Inc.");
2157 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2158 MODULE_LICENSE("GPL");