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