fs/xfs/xfs_super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "xfs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_sb.h"
  13 #include "xfs_mount.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_btree.h"
  16 #include "xfs_bmap.h"
  17 #include "xfs_alloc.h"
  18 #include "xfs_fsops.h"
  19 #include "xfs_trans.h"
  20 #include "xfs_buf_item.h"
  21 #include "xfs_log.h"
  22 #include "xfs_log_priv.h"
  23 #include "xfs_dir2.h"
  24 #include "xfs_extfree_item.h"
  25 #include "xfs_mru_cache.h"
  26 #include "xfs_inode_item.h"
  27 #include "xfs_icache.h"
  28 #include "xfs_trace.h"
  29 #include "xfs_icreate_item.h"
  30 #include "xfs_filestream.h"
  31 #include "xfs_quota.h"
  32 #include "xfs_sysfs.h"
  33 #include "xfs_ondisk.h"
  34 #include "xfs_rmap_item.h"
  35 #include "xfs_refcount_item.h"
  36 #include "xfs_bmap_item.h"
  37 #include "xfs_reflink.h"
  38
  39 #include <linux/magic.h>
  40 #include <linux/parser.h>
  41
  42 static const struct super_operations xfs_super_operations;
  43
  44 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
  45 #ifdef DEBUG
  46 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
  47 #endif
  48
  49 /*
  50  * Table driven mount option parser.
  51  */
  52 enum {
  53         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
  54         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
  55         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
  56         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
  57         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
  58         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
  59         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
  60         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
  61         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
  62 };
  63
  64 static const match_table_t tokens = {
  65         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
  66         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
  67         {Opt_logdev,    "logdev=%s"},   /* log device */
  68         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
  69         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
  70         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
  71         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
  72         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
  73         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
  74         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
  75         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
  76         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
  77         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
  78         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
  79         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
  80         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
  81         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
  82         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
  83         {Opt_inode32,   "inode32"},     /* inode allocation limited to
  84                                          * XFS_MAXINUMBER_32 */
  85         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
  86         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
  87         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
  88         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
  89                                          * in stat(). */
  90         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
  91         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
  92         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
  93         {Opt_quota,     "quota"},       /* disk quotas (user) */
  94         {Opt_noquota,   "noquota"},     /* no quotas */
  95         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
  96         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
  97         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
  98         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
  99         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
 100         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
 101         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
 102         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
 103         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
 104         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
 105         {Opt_discard,   "discard"},     /* Discard unused blocks */
 106         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
 107         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
 108         {Opt_err,       NULL},
 109 };
 110
 111
 112 STATIC int
 113 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 114 {
 115         int     last, shift_left_factor = 0, _res;
 116         char    *value;
 117         int     ret = 0;
 118
 119         value = match_strdup(s);
 120         if (!value)
 121                 return -ENOMEM;
 122
 123         last = strlen(value) - 1;
 124         if (value[last] == 'K' || value[last] == 'k') {
 125                 shift_left_factor = 10;
 126                 value[last] = '\0';
 127         }
 128         if (value[last] == 'M' || value[last] == 'm') {
 129                 shift_left_factor = 20;
 130                 value[last] = '\0';
 131         }
 132         if (value[last] == 'G' || value[last] == 'g') {
 133                 shift_left_factor = 30;
 134                 value[last] = '\0';
 135         }
 136
 137         if (kstrtoint(value, base, &_res))
 138                 ret = -EINVAL;
 139         kfree(value);
 140         *res = _res << shift_left_factor;
 141         return ret;
 142 }
 143
 144 /*
 145  * This function fills in xfs_mount_t fields based on mount args.
 146  * Note: the superblock has _not_ yet been read in.
 147  *
 148  * Note that this function leaks the various device name allocations on
 149  * failure.  The caller takes care of them.
 150  *
 151  * *sb is const because this is also used to test options on the remount
 152  * path, and we don't want this to have any side effects at remount time.
 153  * Today this function does not change *sb, but just to future-proof...
 154  */
 155 STATIC int
 156 xfs_parseargs(
 157         struct xfs_mount        *mp,
 158         char                    *options)
 159 {
 160         const struct super_block *sb = mp->m_super;
 161         char                    *p;
 162         substring_t             args[MAX_OPT_ARGS];
 163         int                     dsunit = 0;
 164         int                     dswidth = 0;
 165         int                     iosize = 0;
 166         uint8_t                 iosizelog = 0;
 167
 168         /*
 169          * set up the mount name first so all the errors will refer to the
 170          * correct device.
 171          */
 172         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 173         if (!mp->m_fsname)
 174                 return -ENOMEM;
 175         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 176
 177         /*
 178          * Copy binary VFS mount flags we are interested in.
 179          */
 180         if (sb_rdonly(sb))
 181                 mp->m_flags |= XFS_MOUNT_RDONLY;
 182         if (sb->s_flags & SB_DIRSYNC)
 183                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 184         if (sb->s_flags & SB_SYNCHRONOUS)
 185                 mp->m_flags |= XFS_MOUNT_WSYNC;
 186
 187         /*
 188          * Set some default flags that could be cleared by the mount option
 189          * parsing.
 190          */
 191         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 192
 193         /*
 194          * These can be overridden by the mount option parsing.
 195          */
 196         mp->m_logbufs = -1;
 197         mp->m_logbsize = -1;
 198
 199         if (!options)
 200                 goto done;
 201
 202         while ((p = strsep(&options, ",")) != NULL) {
 203                 int             token;
 204
 205                 if (!*p)
 206                         continue;
 207
 208                 token = match_token(p, tokens, args);
 209                 switch (token) {
 210                 case Opt_logbufs:
 211                         if (match_int(args, &mp->m_logbufs))
 212                                 return -EINVAL;
 213                         break;
 214                 case Opt_logbsize:
 215                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
 216                                 return -EINVAL;
 217                         break;
 218                 case Opt_logdev:
 219                         kfree(mp->m_logname);
 220                         mp->m_logname = match_strdup(args);
 221                         if (!mp->m_logname)
 222                                 return -ENOMEM;
 223                         break;
 224                 case Opt_rtdev:
 225                         kfree(mp->m_rtname);
 226                         mp->m_rtname = match_strdup(args);
 227                         if (!mp->m_rtname)
 228                                 return -ENOMEM;
 229                         break;
 230                 case Opt_allocsize:
 231                 case Opt_biosize:
 232                         if (suffix_kstrtoint(args, 10, &iosize))
 233                                 return -EINVAL;
 234                         iosizelog = ffs(iosize) - 1;
 235                         break;
 236                 case Opt_grpid:
 237                 case Opt_bsdgroups:
 238                         mp->m_flags |= XFS_MOUNT_GRPID;
 239                         break;
 240                 case Opt_nogrpid:
 241                 case Opt_sysvgroups:
 242                         mp->m_flags &= ~XFS_MOUNT_GRPID;
 243                         break;
 244                 case Opt_wsync:
 245                         mp->m_flags |= XFS_MOUNT_WSYNC;
 246                         break;
 247                 case Opt_norecovery:
 248                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
 249                         break;
 250                 case Opt_noalign:
 251                         mp->m_flags |= XFS_MOUNT_NOALIGN;
 252                         break;
 253                 case Opt_swalloc:
 254                         mp->m_flags |= XFS_MOUNT_SWALLOC;
 255                         break;
 256                 case Opt_sunit:
 257                         if (match_int(args, &dsunit))
 258                                 return -EINVAL;
 259                         break;
 260                 case Opt_swidth:
 261                         if (match_int(args, &dswidth))
 262                                 return -EINVAL;
 263                         break;
 264                 case Opt_inode32:
 265                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 266                         break;
 267                 case Opt_inode64:
 268                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 269                         break;
 270                 case Opt_nouuid:
 271                         mp->m_flags |= XFS_MOUNT_NOUUID;
 272                         break;
 273                 case Opt_ikeep:
 274                         mp->m_flags |= XFS_MOUNT_IKEEP;
 275                         break;
 276                 case Opt_noikeep:
 277                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
 278                         break;
 279                 case Opt_largeio:
 280                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 281                         break;
 282                 case Opt_nolargeio:
 283                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 284                         break;
 285                 case Opt_attr2:
 286                         mp->m_flags |= XFS_MOUNT_ATTR2;
 287                         break;
 288                 case Opt_noattr2:
 289                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
 290                         mp->m_flags |= XFS_MOUNT_NOATTR2;
 291                         break;
 292                 case Opt_filestreams:
 293                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 294                         break;
 295                 case Opt_noquota:
 296                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 297                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 298                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 299                         break;
 300                 case Opt_quota:
 301                 case Opt_uquota:
 302                 case Opt_usrquota:
 303                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 304                                          XFS_UQUOTA_ENFD);
 305                         break;
 306                 case Opt_qnoenforce:
 307                 case Opt_uqnoenforce:
 308                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 309                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 310                         break;
 311                 case Opt_pquota:
 312                 case Opt_prjquota:
 313                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 314                                          XFS_PQUOTA_ENFD);
 315                         break;
 316                 case Opt_pqnoenforce:
 317                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 318                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
 319                         break;
 320                 case Opt_gquota:
 321                 case Opt_grpquota:
 322                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 323                                          XFS_GQUOTA_ENFD);
 324                         break;
 325                 case Opt_gqnoenforce:
 326                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 327                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
 328                         break;
 329                 case Opt_discard:
 330                         mp->m_flags |= XFS_MOUNT_DISCARD;
 331                         break;
 332                 case Opt_nodiscard:
 333                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
 334                         break;
 335 #ifdef CONFIG_FS_DAX
 336                 case Opt_dax:
 337                         mp->m_flags |= XFS_MOUNT_DAX;
 338                         break;
 339 #endif
 340                 default:
 341                         xfs_warn(mp, "unknown mount option [%s].", p);
 342                         return -EINVAL;
 343                 }
 344         }
 345
 346         /*
 347          * no recovery flag requires a read-only mount
 348          */
 349         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 350             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 351                 xfs_warn(mp, "no-recovery mounts must be read-only.");
 352                 return -EINVAL;
 353         }
 354
 355         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
 356                 xfs_warn(mp,
 357         "sunit and swidth options incompatible with the noalign option");
 358                 return -EINVAL;
 359         }
 360
 361 #ifndef CONFIG_XFS_QUOTA
 362         if (XFS_IS_QUOTA_RUNNING(mp)) {
 363                 xfs_warn(mp, "quota support not available in this kernel.");
 364                 return -EINVAL;
 365         }
 366 #endif
 367
 368         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 369                 xfs_warn(mp, "sunit and swidth must be specified together");
 370                 return -EINVAL;
 371         }
 372
 373         if (dsunit && (dswidth % dsunit != 0)) {
 374                 xfs_warn(mp,
 375         "stripe width (%d) must be a multiple of the stripe unit (%d)",
 376                         dswidth, dsunit);
 377                 return -EINVAL;
 378         }
 379
 380 done:
 381         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
 382                 /*
 383                  * At this point the superblock has not been read
 384                  * in, therefore we do not know the block size.
 385                  * Before the mount call ends we will convert
 386                  * these to FSBs.
 387                  */
 388                 mp->m_dalign = dsunit;
 389                 mp->m_swidth = dswidth;
 390         }
 391
 392         if (mp->m_logbufs != -1 &&
 393             mp->m_logbufs != 0 &&
 394             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 395              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 396                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 397                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 398                 return -EINVAL;
 399         }
 400         if (mp->m_logbsize != -1 &&
 401             mp->m_logbsize !=  0 &&
 402             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 403              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 404              !is_power_of_2(mp->m_logbsize))) {
 405                 xfs_warn(mp,
 406                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 407                         mp->m_logbsize);
 408                 return -EINVAL;
 409         }
 410
 411         if (iosizelog) {
 412                 if (iosizelog > XFS_MAX_IO_LOG ||
 413                     iosizelog < XFS_MIN_IO_LOG) {
 414                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 415                                 iosizelog, XFS_MIN_IO_LOG,
 416                                 XFS_MAX_IO_LOG);
 417                         return -EINVAL;
 418                 }
 419
 420                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 421                 mp->m_readio_log = iosizelog;
 422                 mp->m_writeio_log = iosizelog;
 423         }
 424
 425         return 0;
 426 }
 427
 428 struct proc_xfs_info {
 429         uint64_t        flag;
 430         char            *str;
 431 };
 432
 433 STATIC void
 434 xfs_showargs(
 435         struct xfs_mount        *mp,
 436         struct seq_file         *m)
 437 {
 438         static struct proc_xfs_info xfs_info_set[] = {
 439                 /* the few simple ones we can get from the mount struct */
 440                 { XFS_MOUNT_IKEEP,              ",ikeep" },
 441                 { XFS_MOUNT_WSYNC,              ",wsync" },
 442                 { XFS_MOUNT_NOALIGN,            ",noalign" },
 443                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
 444                 { XFS_MOUNT_NOUUID,             ",nouuid" },
 445                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
 446                 { XFS_MOUNT_ATTR2,              ",attr2" },
 447                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
 448                 { XFS_MOUNT_GRPID,              ",grpid" },
 449                 { XFS_MOUNT_DISCARD,            ",discard" },
 450                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
 451                 { XFS_MOUNT_DAX,                ",dax" },
 452                 { 0, NULL }
 453         };
 454         static struct proc_xfs_info xfs_info_unset[] = {
 455                 /* the few simple ones we can get from the mount struct */
 456                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
 457                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
 458                 { 0, NULL }
 459         };
 460         struct proc_xfs_info    *xfs_infop;
 461
 462         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 463                 if (mp->m_flags & xfs_infop->flag)
 464                         seq_puts(m, xfs_infop->str);
 465         }
 466         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 467                 if (!(mp->m_flags & xfs_infop->flag))
 468                         seq_puts(m, xfs_infop->str);
 469         }
 470
 471         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 472                 seq_printf(m, ",allocsize=%dk",
 473                                 (int)(1 << mp->m_writeio_log) >> 10);
 474
 475         if (mp->m_logbufs > 0)
 476                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
 477         if (mp->m_logbsize > 0)
 478                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
 479
 480         if (mp->m_logname)
 481                 seq_show_option(m, "logdev", mp->m_logname);
 482         if (mp->m_rtname)
 483                 seq_show_option(m, "rtdev", mp->m_rtname);
 484
 485         if (mp->m_dalign > 0)
 486                 seq_printf(m, ",sunit=%d",
 487                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 488         if (mp->m_swidth > 0)
 489                 seq_printf(m, ",swidth=%d",
 490                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 491
 492         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 493                 seq_puts(m, ",usrquota");
 494         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 495                 seq_puts(m, ",uqnoenforce");
 496
 497         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 498                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
 499                         seq_puts(m, ",prjquota");
 500                 else
 501                         seq_puts(m, ",pqnoenforce");
 502         }
 503         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 504                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
 505                         seq_puts(m, ",grpquota");
 506                 else
 507                         seq_puts(m, ",gqnoenforce");
 508         }
 509
 510         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 511                 seq_puts(m, ",noquota");
 512 }
 513
 514 static uint64_t
 515 xfs_max_file_offset(
 516         unsigned int            blockshift)
 517 {
 518         unsigned int            pagefactor = 1;
 519         unsigned int            bitshift = BITS_PER_LONG - 1;
 520
 521         /* Figure out maximum filesize, on Linux this can depend on
 522          * the filesystem blocksize (on 32 bit platforms).
 523          * __block_write_begin does this in an [unsigned] long long...
 524          *      page->index << (PAGE_SHIFT - bbits)
 525          * So, for page sized blocks (4K on 32 bit platforms),
 526          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 527          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
 528          * but for smaller blocksizes it is less (bbits = log2 bsize).
 529          */
 530
 531 #if BITS_PER_LONG == 32
 532         ASSERT(sizeof(sector_t) == 8);
 533         pagefactor = PAGE_SIZE;
 534         bitshift = BITS_PER_LONG;
 535 #endif
 536
 537         return (((uint64_t)pagefactor) << bitshift) - 1;
 538 }
 539
 540 /*
 541  * Set parameters for inode allocation heuristics, taking into account
 542  * filesystem size and inode32/inode64 mount options; i.e. specifically
 543  * whether or not XFS_MOUNT_SMALL_INUMS is set.
 544  *
 545  * Inode allocation patterns are altered only if inode32 is requested
 546  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
 547  * If altered, XFS_MOUNT_32BITINODES is set as well.
 548  *
 549  * An agcount independent of that in the mount structure is provided
 550  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
 551  * to the potentially higher ag count.
 552  *
 553  * Returns the maximum AG index which may contain inodes.
 554  */
 555 xfs_agnumber_t
 556 xfs_set_inode_alloc(
 557         struct xfs_mount *mp,
 558         xfs_agnumber_t  agcount)
 559 {
 560         xfs_agnumber_t  index;
 561         xfs_agnumber_t  maxagi = 0;
 562         xfs_sb_t        *sbp = &mp->m_sb;
 563         xfs_agnumber_t  max_metadata;
 564         xfs_agino_t     agino;
 565         xfs_ino_t       ino;
 566
 567         /*
 568          * Calculate how much should be reserved for inodes to meet
 569          * the max inode percentage.  Used only for inode32.
 570          */
 571         if (M_IGEO(mp)->maxicount) {
 572                 uint64_t        icount;
 573
 574                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 575                 do_div(icount, 100);
 576                 icount += sbp->sb_agblocks - 1;
 577                 do_div(icount, sbp->sb_agblocks);
 578                 max_metadata = icount;
 579         } else {
 580                 max_metadata = agcount;
 581         }
 582
 583         /* Get the last possible inode in the filesystem */
 584         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
 585         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
 586
 587         /*
 588          * If user asked for no more than 32-bit inodes, and the fs is
 589          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
 590          * the allocator to accommodate the request.
 591          */
 592         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
 593                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 594         else
 595                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
 596
 597         for (index = 0; index < agcount; index++) {
 598                 struct xfs_perag        *pag;
 599
 600                 ino = XFS_AGINO_TO_INO(mp, index, agino);
 601
 602                 pag = xfs_perag_get(mp, index);
 603
 604                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
 605                         if (ino > XFS_MAXINUMBER_32) {
 606                                 pag->pagi_inodeok = 0;
 607                                 pag->pagf_metadata = 0;
 608                         } else {
 609                                 pag->pagi_inodeok = 1;
 610                                 maxagi++;
 611                                 if (index < max_metadata)
 612                                         pag->pagf_metadata = 1;
 613                                 else
 614                                         pag->pagf_metadata = 0;
 615                         }
 616                 } else {
 617                         pag->pagi_inodeok = 1;
 618                         pag->pagf_metadata = 0;
 619                 }
 620
 621                 xfs_perag_put(pag);
 622         }
 623
 624         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
 625 }
 626
 627 STATIC int
 628 xfs_blkdev_get(
 629         xfs_mount_t             *mp,
 630         const char              *name,
 631         struct block_device     **bdevp)
 632 {
 633         int                     error = 0;
 634
 635         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 636                                     mp);
 637         if (IS_ERR(*bdevp)) {
 638                 error = PTR_ERR(*bdevp);
 639                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
 640         }
 641
 642         return error;
 643 }
 644
 645 STATIC void
 646 xfs_blkdev_put(
 647         struct block_device     *bdev)
 648 {
 649         if (bdev)
 650                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 651 }
 652
 653 void
 654 xfs_blkdev_issue_flush(
 655         xfs_buftarg_t           *buftarg)
 656 {
 657         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 658 }
 659
 660 STATIC void
 661 xfs_close_devices(
 662         struct xfs_mount        *mp)
 663 {
 664         struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
 665
 666         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 667                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 668                 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
 669
 670                 xfs_free_buftarg(mp->m_logdev_targp);
 671                 xfs_blkdev_put(logdev);
 672                 fs_put_dax(dax_logdev);
 673         }
 674         if (mp->m_rtdev_targp) {
 675                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 676                 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
 677
 678                 xfs_free_buftarg(mp->m_rtdev_targp);
 679                 xfs_blkdev_put(rtdev);
 680                 fs_put_dax(dax_rtdev);
 681         }
 682         xfs_free_buftarg(mp->m_ddev_targp);
 683         fs_put_dax(dax_ddev);
 684 }
 685
 686 /*
 687  * The file system configurations are:
 688  *      (1) device (partition) with data and internal log
 689  *      (2) logical volume with data and log subvolumes.
 690  *      (3) logical volume with data, log, and realtime subvolumes.
 691  *
 692  * We only have to handle opening the log and realtime volumes here if
 693  * they are present.  The data subvolume has already been opened by
 694  * get_sb_bdev() and is stored in sb->s_bdev.
 695  */
 696 STATIC int
 697 xfs_open_devices(
 698         struct xfs_mount        *mp)
 699 {
 700         struct block_device     *ddev = mp->m_super->s_bdev;
 701         struct dax_device       *dax_ddev = fs_dax_get_by_bdev(ddev);
 702         struct dax_device       *dax_logdev = NULL, *dax_rtdev = NULL;
 703         struct block_device     *logdev = NULL, *rtdev = NULL;
 704         int                     error;
 705
 706         /*
 707          * Open real time and log devices - order is important.
 708          */
 709         if (mp->m_logname) {
 710                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 711                 if (error)
 712                         goto out;
 713                 dax_logdev = fs_dax_get_by_bdev(logdev);
 714         }
 715
 716         if (mp->m_rtname) {
 717                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 718                 if (error)
 719                         goto out_close_logdev;
 720
 721                 if (rtdev == ddev || rtdev == logdev) {
 722                         xfs_warn(mp,
 723         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 724                         error = -EINVAL;
 725                         goto out_close_rtdev;
 726                 }
 727                 dax_rtdev = fs_dax_get_by_bdev(rtdev);
 728         }
 729
 730         /*
 731          * Setup xfs_mount buffer target pointers
 732          */
 733         error = -ENOMEM;
 734         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
 735         if (!mp->m_ddev_targp)
 736                 goto out_close_rtdev;
 737
 738         if (rtdev) {
 739                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
 740                 if (!mp->m_rtdev_targp)
 741                         goto out_free_ddev_targ;
 742         }
 743
 744         if (logdev && logdev != ddev) {
 745                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
 746                 if (!mp->m_logdev_targp)
 747                         goto out_free_rtdev_targ;
 748         } else {
 749                 mp->m_logdev_targp = mp->m_ddev_targp;
 750         }
 751
 752         return 0;
 753
 754  out_free_rtdev_targ:
 755         if (mp->m_rtdev_targp)
 756                 xfs_free_buftarg(mp->m_rtdev_targp);
 757  out_free_ddev_targ:
 758         xfs_free_buftarg(mp->m_ddev_targp);
 759  out_close_rtdev:
 760         xfs_blkdev_put(rtdev);
 761         fs_put_dax(dax_rtdev);
 762  out_close_logdev:
 763         if (logdev && logdev != ddev) {
 764                 xfs_blkdev_put(logdev);
 765                 fs_put_dax(dax_logdev);
 766         }
 767  out:
 768         fs_put_dax(dax_ddev);
 769         return error;
 770 }
 771
 772 /*
 773  * Setup xfs_mount buffer target pointers based on superblock
 774  */
 775 STATIC int
 776 xfs_setup_devices(
 777         struct xfs_mount        *mp)
 778 {
 779         int                     error;
 780
 781         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
 782         if (error)
 783                 return error;
 784
 785         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 786                 unsigned int    log_sector_size = BBSIZE;
 787
 788                 if (xfs_sb_version_hassector(&mp->m_sb))
 789                         log_sector_size = mp->m_sb.sb_logsectsize;
 790                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 791                                             log_sector_size);
 792                 if (error)
 793                         return error;
 794         }
 795         if (mp->m_rtdev_targp) {
 796                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 797                                             mp->m_sb.sb_sectsize);
 798                 if (error)
 799                         return error;
 800         }
 801
 802         return 0;
 803 }
 804
 805 STATIC int
 806 xfs_init_mount_workqueues(
 807         struct xfs_mount        *mp)
 808 {
 809         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
 810                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
 811         if (!mp->m_buf_workqueue)
 812                 goto out;
 813
 814         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 815                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 816         if (!mp->m_unwritten_workqueue)
 817                 goto out_destroy_buf;
 818
 819         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 820                         WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND,
 821                         0, mp->m_fsname);
 822         if (!mp->m_cil_workqueue)
 823                 goto out_destroy_unwritten;
 824
 825         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
 826                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 827         if (!mp->m_reclaim_workqueue)
 828                 goto out_destroy_cil;
 829
 830         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
 831                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
 832         if (!mp->m_eofblocks_workqueue)
 833                 goto out_destroy_reclaim;
 834
 835         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
 836                                                mp->m_fsname);
 837         if (!mp->m_sync_workqueue)
 838                 goto out_destroy_eofb;
 839
 840         return 0;
 841
 842 out_destroy_eofb:
 843         destroy_workqueue(mp->m_eofblocks_workqueue);
 844 out_destroy_reclaim:
 845         destroy_workqueue(mp->m_reclaim_workqueue);
 846 out_destroy_cil:
 847         destroy_workqueue(mp->m_cil_workqueue);
 848 out_destroy_unwritten:
 849         destroy_workqueue(mp->m_unwritten_workqueue);
 850 out_destroy_buf:
 851         destroy_workqueue(mp->m_buf_workqueue);
 852 out:
 853         return -ENOMEM;
 854 }
 855
 856 STATIC void
 857 xfs_destroy_mount_workqueues(
 858         struct xfs_mount        *mp)
 859 {
 860         destroy_workqueue(mp->m_sync_workqueue);
 861         destroy_workqueue(mp->m_eofblocks_workqueue);
 862         destroy_workqueue(mp->m_reclaim_workqueue);
 863         destroy_workqueue(mp->m_cil_workqueue);
 864         destroy_workqueue(mp->m_unwritten_workqueue);
 865         destroy_workqueue(mp->m_buf_workqueue);
 866 }
 867
 868 /*
 869  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
 870  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
 871  * for IO to complete so that we effectively throttle multiple callers to the
 872  * rate at which IO is completing.
 873  */
 874 void
 875 xfs_flush_inodes(
 876         struct xfs_mount        *mp)
 877 {
 878         struct super_block      *sb = mp->m_super;
 879
 880         if (down_read_trylock(&sb->s_umount)) {
 881                 sync_inodes_sb(sb);
 882                 up_read(&sb->s_umount);
 883         }
 884 }
 885
 886 /* Catch misguided souls that try to use this interface on XFS */
 887 STATIC struct inode *
 888 xfs_fs_alloc_inode(
 889         struct super_block      *sb)
 890 {
 891         BUG();
 892         return NULL;
 893 }
 894
 895 #ifdef DEBUG
 896 static void
 897 xfs_check_delalloc(
 898         struct xfs_inode        *ip,
 899         int                     whichfork)
 900 {
 901         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 902         struct xfs_bmbt_irec    got;
 903         struct xfs_iext_cursor  icur;
 904
 905         if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
 906                 return;
 907         do {
 908                 if (isnullstartblock(got.br_startblock)) {
 909                         xfs_warn(ip->i_mount,
 910         "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
 911                                 ip->i_ino,
 912                                 whichfork == XFS_DATA_FORK ? "data" : "cow",
 913                                 got.br_startoff, got.br_blockcount);
 914                 }
 915         } while (xfs_iext_next_extent(ifp, &icur, &got));
 916 }
 917 #else
 918 #define xfs_check_delalloc(ip, whichfork)       do { } while (0)
 919 #endif
 920
 921 /*
 922  * Now that the generic code is guaranteed not to be accessing
 923  * the linux inode, we can inactivate and reclaim the inode.
 924  */
 925 STATIC void
 926 xfs_fs_destroy_inode(
 927         struct inode            *inode)
 928 {
 929         struct xfs_inode        *ip = XFS_I(inode);
 930
 931         trace_xfs_destroy_inode(ip);
 932
 933         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 934         XFS_STATS_INC(ip->i_mount, vn_rele);
 935         XFS_STATS_INC(ip->i_mount, vn_remove);
 936
 937         xfs_inactive(ip);
 938
 939         if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
 940                 xfs_check_delalloc(ip, XFS_DATA_FORK);
 941                 xfs_check_delalloc(ip, XFS_COW_FORK);
 942                 ASSERT(0);
 943         }
 944
 945         XFS_STATS_INC(ip->i_mount, vn_reclaim);
 946
 947         /*
 948          * We should never get here with one of the reclaim flags already set.
 949          */
 950         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 951         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 952
 953         /*
 954          * We always use background reclaim here because even if the
 955          * inode is clean, it still may be under IO and hence we have
 956          * to take the flush lock. The background reclaim path handles
 957          * this more efficiently than we can here, so simply let background
 958          * reclaim tear down all inodes.
 959          */
 960         xfs_inode_set_reclaim_tag(ip);
 961 }
 962
 963 static void
 964 xfs_fs_dirty_inode(
 965         struct inode                    *inode,
 966         int                             flag)
 967 {
 968         struct xfs_inode                *ip = XFS_I(inode);
 969         struct xfs_mount                *mp = ip->i_mount;
 970         struct xfs_trans                *tp;
 971
 972         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
 973                 return;
 974         if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
 975                 return;
 976
 977         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
 978                 return;
 979         xfs_ilock(ip, XFS_ILOCK_EXCL);
 980         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 981         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 982         xfs_trans_commit(tp);
 983 }
 984
 985 /*
 986  * Slab object creation initialisation for the XFS inode.
 987  * This covers only the idempotent fields in the XFS inode;
 988  * all other fields need to be initialised on allocation
 989  * from the slab. This avoids the need to repeatedly initialise
 990  * fields in the xfs inode that left in the initialise state
 991  * when freeing the inode.
 992  */
 993 STATIC void
 994 xfs_fs_inode_init_once(
 995         void                    *inode)
 996 {
 997         struct xfs_inode        *ip = inode;
 998
 999         memset(ip, 0, sizeof(struct xfs_inode));
1000
1001         /* vfs inode */
1002         inode_init_once(VFS_I(ip));
1003
1004         /* xfs inode */
1005         atomic_set(&ip->i_pincount, 0);
1006         spin_lock_init(&ip->i_flags_lock);
1007
1008         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1009                      "xfsino", ip->i_ino);
1010         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1011                      "xfsino", ip->i_ino);
1012 }
1013
1014 /*
1015  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1016  * serialised against cache hits here via the inode->i_lock and igrab() in
1017  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1018  * racing with us, and it avoids needing to grab a spinlock here for every inode
1019  * we drop the final reference on.
1020  */
1021 STATIC int
1022 xfs_fs_drop_inode(
1023         struct inode            *inode)
1024 {
1025         struct xfs_inode        *ip = XFS_I(inode);
1026
1027         /*
1028          * If this unlinked inode is in the middle of recovery, don't
1029          * drop the inode just yet; log recovery will take care of
1030          * that.  See the comment for this inode flag.
1031          */
1032         if (ip->i_flags & XFS_IRECOVERY) {
1033                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1034                 return 0;
1035         }
1036
1037         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1038 }
1039
1040 STATIC void
1041 xfs_free_fsname(
1042         struct xfs_mount        *mp)
1043 {
1044         kfree(mp->m_fsname);
1045         kfree(mp->m_rtname);
1046         kfree(mp->m_logname);
1047 }
1048
1049 STATIC int
1050 xfs_fs_sync_fs(
1051         struct super_block      *sb,
1052         int                     wait)
1053 {
1054         struct xfs_mount        *mp = XFS_M(sb);
1055
1056         /*
1057          * Doing anything during the async pass would be counterproductive.
1058          */
1059         if (!wait)
1060                 return 0;
1061
1062         xfs_log_force(mp, XFS_LOG_SYNC);
1063         if (laptop_mode) {
1064                 /*
1065                  * The disk must be active because we're syncing.
1066                  * We schedule log work now (now that the disk is
1067                  * active) instead of later (when it might not be).
1068                  */
1069                 flush_delayed_work(&mp->m_log->l_work);
1070         }
1071
1072         return 0;
1073 }
1074
1075 STATIC int
1076 xfs_fs_statfs(
1077         struct dentry           *dentry,
1078         struct kstatfs          *statp)
1079 {
1080         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1081         xfs_sb_t                *sbp = &mp->m_sb;
1082         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1083         uint64_t                fakeinos, id;
1084         uint64_t                icount;
1085         uint64_t                ifree;
1086         uint64_t                fdblocks;
1087         xfs_extlen_t            lsize;
1088         int64_t                 ffree;
1089
1090         statp->f_type = XFS_SUPER_MAGIC;
1091         statp->f_namelen = MAXNAMELEN - 1;
1092
1093         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1094         statp->f_fsid.val[0] = (u32)id;
1095         statp->f_fsid.val[1] = (u32)(id >> 32);
1096
1097         icount = percpu_counter_sum(&mp->m_icount);
1098         ifree = percpu_counter_sum(&mp->m_ifree);
1099         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1100
1101         spin_lock(&mp->m_sb_lock);
1102         statp->f_bsize = sbp->sb_blocksize;
1103         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1104         statp->f_blocks = sbp->sb_dblocks - lsize;
1105         spin_unlock(&mp->m_sb_lock);
1106
1107         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1108         statp->f_bavail = statp->f_bfree;
1109
1110         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
1111         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
1112         if (M_IGEO(mp)->maxicount)
1113                 statp->f_files = min_t(typeof(statp->f_files),
1114                                         statp->f_files,
1115                                         M_IGEO(mp)->maxicount);
1116
1117         /* If sb_icount overshot maxicount, report actual allocation */
1118         statp->f_files = max_t(typeof(statp->f_files),
1119                                         statp->f_files,
1120                                         sbp->sb_icount);
1121
1122         /* make sure statp->f_ffree does not underflow */
1123         ffree = statp->f_files - (icount - ifree);
1124         statp->f_ffree = max_t(int64_t, ffree, 0);
1125
1126
1127         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1128             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1129                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1130                 xfs_qm_statvfs(ip, statp);
1131
1132         if (XFS_IS_REALTIME_MOUNT(mp) &&
1133             (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
1134                 statp->f_blocks = sbp->sb_rblocks;
1135                 statp->f_bavail = statp->f_bfree =
1136                         sbp->sb_frextents * sbp->sb_rextsize;
1137         }
1138
1139         return 0;
1140 }
1141
1142 STATIC void
1143 xfs_save_resvblks(struct xfs_mount *mp)
1144 {
1145         uint64_t resblks = 0;
1146
1147         mp->m_resblks_save = mp->m_resblks;
1148         xfs_reserve_blocks(mp, &resblks, NULL);
1149 }
1150
1151 STATIC void
1152 xfs_restore_resvblks(struct xfs_mount *mp)
1153 {
1154         uint64_t resblks;
1155
1156         if (mp->m_resblks_save) {
1157                 resblks = mp->m_resblks_save;
1158                 mp->m_resblks_save = 0;
1159         } else
1160                 resblks = xfs_default_resblks(mp);
1161
1162         xfs_reserve_blocks(mp, &resblks, NULL);
1163 }
1164
1165 /*
1166  * Trigger writeback of all the dirty metadata in the file system.
1167  *
1168  * This ensures that the metadata is written to their location on disk rather
1169  * than just existing in transactions in the log. This means after a quiesce
1170  * there is no log replay required to write the inodes to disk - this is the
1171  * primary difference between a sync and a quiesce.
1172  *
1173  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1174  * it is started again when appropriate.
1175  */
1176 void
1177 xfs_quiesce_attr(
1178         struct xfs_mount        *mp)
1179 {
1180         int     error = 0;
1181
1182         /* wait for all modifications to complete */
1183         while (atomic_read(&mp->m_active_trans) > 0)
1184                 delay(100);
1185
1186         /* force the log to unpin objects from the now complete transactions */
1187         xfs_log_force(mp, XFS_LOG_SYNC);
1188
1189         /* reclaim inodes to do any IO before the freeze completes */
1190         xfs_reclaim_inodes(mp, 0);
1191         xfs_reclaim_inodes(mp, SYNC_WAIT);
1192
1193         /* Push the superblock and write an unmount record */
1194         error = xfs_log_sbcount(mp);
1195         if (error)
1196                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1197                                 "Frozen image may not be consistent.");
1198         /*
1199          * Just warn here till VFS can correctly support
1200          * read-only remount without racing.
1201          */
1202         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1203
1204         xfs_log_quiesce(mp);
1205 }
1206
1207 STATIC int
1208 xfs_test_remount_options(
1209         struct super_block      *sb,
1210         char                    *options)
1211 {
1212         int                     error = 0;
1213         struct xfs_mount        *tmp_mp;
1214
1215         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1216         if (!tmp_mp)
1217                 return -ENOMEM;
1218
1219         tmp_mp->m_super = sb;
1220         error = xfs_parseargs(tmp_mp, options);
1221         xfs_free_fsname(tmp_mp);
1222         kmem_free(tmp_mp);
1223
1224         return error;
1225 }
1226
1227 STATIC int
1228 xfs_fs_remount(
1229         struct super_block      *sb,
1230         int                     *flags,
1231         char                    *options)
1232 {
1233         struct xfs_mount        *mp = XFS_M(sb);
1234         xfs_sb_t                *sbp = &mp->m_sb;
1235         substring_t             args[MAX_OPT_ARGS];
1236         char                    *p;
1237         int                     error;
1238
1239         /* First, check for complete junk; i.e. invalid options */
1240         error = xfs_test_remount_options(sb, options);
1241         if (error)
1242                 return error;
1243
1244         sync_filesystem(sb);
1245         while ((p = strsep(&options, ",")) != NULL) {
1246                 int token;
1247
1248                 if (!*p)
1249                         continue;
1250
1251                 token = match_token(p, tokens, args);
1252                 switch (token) {
1253                 case Opt_inode64:
1254                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1255                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1256                         break;
1257                 case Opt_inode32:
1258                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1259                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1260                         break;
1261                 default:
1262                         /*
1263                          * Logically we would return an error here to prevent
1264                          * users from believing they might have changed
1265                          * mount options using remount which can't be changed.
1266                          *
1267                          * But unfortunately mount(8) adds all options from
1268                          * mtab and fstab to the mount arguments in some cases
1269                          * so we can't blindly reject options, but have to
1270                          * check for each specified option if it actually
1271                          * differs from the currently set option and only
1272                          * reject it if that's the case.
1273                          *
1274                          * Until that is implemented we return success for
1275                          * every remount request, and silently ignore all
1276                          * options that we can't actually change.
1277                          */
1278 #if 0
1279                         xfs_info(mp,
1280                 "mount option \"%s\" not supported for remount", p);
1281                         return -EINVAL;
1282 #else
1283                         break;
1284 #endif
1285                 }
1286         }
1287
1288         /* ro -> rw */
1289         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) {
1290                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1291                         xfs_warn(mp,
1292                 "ro->rw transition prohibited on norecovery mount");
1293                         return -EINVAL;
1294                 }
1295
1296                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1297                     xfs_sb_has_ro_compat_feature(sbp,
1298                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1299                         xfs_warn(mp,
1300 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1301                                 (sbp->sb_features_ro_compat &
1302                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1303                         return -EINVAL;
1304                 }
1305
1306                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1307
1308                 /*
1309                  * If this is the first remount to writeable state we
1310                  * might have some superblock changes to update.
1311                  */
1312                 if (mp->m_update_sb) {
1313                         error = xfs_sync_sb(mp, false);
1314                         if (error) {
1315                                 xfs_warn(mp, "failed to write sb changes");
1316                                 return error;
1317                         }
1318                         mp->m_update_sb = false;
1319                 }
1320
1321                 /*
1322                  * Fill out the reserve pool if it is empty. Use the stashed
1323                  * value if it is non-zero, otherwise go with the default.
1324                  */
1325                 xfs_restore_resvblks(mp);
1326                 xfs_log_work_queue(mp);
1327
1328                 /* Recover any CoW blocks that never got remapped. */
1329                 error = xfs_reflink_recover_cow(mp);
1330                 if (error) {
1331                         xfs_err(mp,
1332         "Error %d recovering leftover CoW allocations.", error);
1333                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1334                         return error;
1335                 }
1336                 xfs_start_block_reaping(mp);
1337
1338                 /* Create the per-AG metadata reservation pool .*/
1339                 error = xfs_fs_reserve_ag_blocks(mp);
1340                 if (error && error != -ENOSPC)
1341                         return error;
1342         }
1343
1344         /* rw -> ro */
1345         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) {
1346                 /*
1347                  * Cancel background eofb scanning so it cannot race with the
1348                  * final log force+buftarg wait and deadlock the remount.
1349                  */
1350                 xfs_stop_block_reaping(mp);
1351
1352                 /* Get rid of any leftover CoW reservations... */
1353                 error = xfs_icache_free_cowblocks(mp, NULL);
1354                 if (error) {
1355                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1356                         return error;
1357                 }
1358
1359                 /* Free the per-AG metadata reservation pool. */
1360                 error = xfs_fs_unreserve_ag_blocks(mp);
1361                 if (error) {
1362                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1363                         return error;
1364                 }
1365
1366                 /*
1367                  * Before we sync the metadata, we need to free up the reserve
1368                  * block pool so that the used block count in the superblock on
1369                  * disk is correct at the end of the remount. Stash the current
1370                  * reserve pool size so that if we get remounted rw, we can
1371                  * return it to the same size.
1372                  */
1373                 xfs_save_resvblks(mp);
1374
1375                 xfs_quiesce_attr(mp);
1376                 mp->m_flags |= XFS_MOUNT_RDONLY;
1377         }
1378
1379         return 0;
1380 }
1381
1382 /*
1383  * Second stage of a freeze. The data is already frozen so we only
1384  * need to take care of the metadata. Once that's done sync the superblock
1385  * to the log to dirty it in case of a crash while frozen. This ensures that we
1386  * will recover the unlinked inode lists on the next mount.
1387  */
1388 STATIC int
1389 xfs_fs_freeze(
1390         struct super_block      *sb)
1391 {
1392         struct xfs_mount        *mp = XFS_M(sb);
1393
1394         xfs_stop_block_reaping(mp);
1395         xfs_save_resvblks(mp);
1396         xfs_quiesce_attr(mp);
1397         return xfs_sync_sb(mp, true);
1398 }
1399
1400 STATIC int
1401 xfs_fs_unfreeze(
1402         struct super_block      *sb)
1403 {
1404         struct xfs_mount        *mp = XFS_M(sb);
1405
1406         xfs_restore_resvblks(mp);
1407         xfs_log_work_queue(mp);
1408         xfs_start_block_reaping(mp);
1409         return 0;
1410 }
1411
1412 STATIC int
1413 xfs_fs_show_options(
1414         struct seq_file         *m,
1415         struct dentry           *root)
1416 {
1417         xfs_showargs(XFS_M(root->d_sb), m);
1418         return 0;
1419 }
1420
1421 /*
1422  * This function fills in xfs_mount_t fields based on mount args.
1423  * Note: the superblock _has_ now been read in.
1424  */
1425 STATIC int
1426 xfs_finish_flags(
1427         struct xfs_mount        *mp)
1428 {
1429         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1430
1431         /* Fail a mount where the logbuf is smaller than the log stripe */
1432         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1433                 if (mp->m_logbsize <= 0 &&
1434                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1435                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1436                 } else if (mp->m_logbsize > 0 &&
1437                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1438                         xfs_warn(mp,
1439                 "logbuf size must be greater than or equal to log stripe size");
1440                         return -EINVAL;
1441                 }
1442         } else {
1443                 /* Fail a mount if the logbuf is larger than 32K */
1444                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1445                         xfs_warn(mp,
1446                 "logbuf size for version 1 logs must be 16K or 32K");
1447                         return -EINVAL;
1448                 }
1449         }
1450
1451         /*
1452          * V5 filesystems always use attr2 format for attributes.
1453          */
1454         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1455             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1456                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1457                              "attr2 is always enabled for V5 filesystems.");
1458                 return -EINVAL;
1459         }
1460
1461         /*
1462          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1463          * told by noattr2 to turn it off
1464          */
1465         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1466             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1467                 mp->m_flags |= XFS_MOUNT_ATTR2;
1468
1469         /*
1470          * prohibit r/w mounts of read-only filesystems
1471          */
1472         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1473                 xfs_warn(mp,
1474                         "cannot mount a read-only filesystem as read-write");
1475                 return -EROFS;
1476         }
1477
1478         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1479             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1480             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1481                 xfs_warn(mp,
1482                   "Super block does not support project and group quota together");
1483                 return -EINVAL;
1484         }
1485
1486         return 0;
1487 }
1488
1489 static int
1490 xfs_init_percpu_counters(
1491         struct xfs_mount        *mp)
1492 {
1493         int             error;
1494
1495         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1496         if (error)
1497                 return -ENOMEM;
1498
1499         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1500         if (error)
1501                 goto free_icount;
1502
1503         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1504         if (error)
1505                 goto free_ifree;
1506
1507         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1508         if (error)
1509                 goto free_fdblocks;
1510
1511         return 0;
1512
1513 free_fdblocks:
1514         percpu_counter_destroy(&mp->m_fdblocks);
1515 free_ifree:
1516         percpu_counter_destroy(&mp->m_ifree);
1517 free_icount:
1518         percpu_counter_destroy(&mp->m_icount);
1519         return -ENOMEM;
1520 }
1521
1522 void
1523 xfs_reinit_percpu_counters(
1524         struct xfs_mount        *mp)
1525 {
1526         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1527         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1528         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1529 }
1530
1531 static void
1532 xfs_destroy_percpu_counters(
1533         struct xfs_mount        *mp)
1534 {
1535         percpu_counter_destroy(&mp->m_icount);
1536         percpu_counter_destroy(&mp->m_ifree);
1537         percpu_counter_destroy(&mp->m_fdblocks);
1538         ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1539                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1540         percpu_counter_destroy(&mp->m_delalloc_blks);
1541 }
1542
1543 static struct xfs_mount *
1544 xfs_mount_alloc(
1545         struct super_block      *sb)
1546 {
1547         struct xfs_mount        *mp;
1548
1549         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1550         if (!mp)
1551                 return NULL;
1552
1553         mp->m_super = sb;
1554         spin_lock_init(&mp->m_sb_lock);
1555         spin_lock_init(&mp->m_agirotor_lock);
1556         INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1557         spin_lock_init(&mp->m_perag_lock);
1558         mutex_init(&mp->m_growlock);
1559         atomic_set(&mp->m_active_trans, 0);
1560         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1561         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1562         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1563         mp->m_kobj.kobject.kset = xfs_kset;
1564         /*
1565          * We don't create the finobt per-ag space reservation until after log
1566          * recovery, so we must set this to true so that an ifree transaction
1567          * started during log recovery will not depend on space reservations
1568          * for finobt expansion.
1569          */
1570         mp->m_finobt_nores = true;
1571         return mp;
1572 }
1573
1574
1575 STATIC int
1576 xfs_fs_fill_super(
1577         struct super_block      *sb,
1578         void                    *data,
1579         int                     silent)
1580 {
1581         struct inode            *root;
1582         struct xfs_mount        *mp = NULL;
1583         int                     flags = 0, error = -ENOMEM;
1584
1585         /*
1586          * allocate mp and do all low-level struct initializations before we
1587          * attach it to the super
1588          */
1589         mp = xfs_mount_alloc(sb);
1590         if (!mp)
1591                 goto out;
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         /*
1608          * Delay mount work if the debug hook is set. This is debug
1609          * instrumention to coordinate simulation of xfs mount failures with
1610          * VFS superblock operations
1611          */
1612         if (xfs_globals.mount_delay) {
1613                 xfs_notice(mp, "Delaying mount for %d seconds.",
1614                         xfs_globals.mount_delay);
1615                 msleep(xfs_globals.mount_delay * 1000);
1616         }
1617
1618         if (silent)
1619                 flags |= XFS_MFSI_QUIET;
1620
1621         error = xfs_open_devices(mp);
1622         if (error)
1623                 goto out_free_fsname;
1624
1625         error = xfs_init_mount_workqueues(mp);
1626         if (error)
1627                 goto out_close_devices;
1628
1629         error = xfs_init_percpu_counters(mp);
1630         if (error)
1631                 goto out_destroy_workqueues;
1632
1633         /* Allocate stats memory before we do operations that might use it */
1634         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1635         if (!mp->m_stats.xs_stats) {
1636                 error = -ENOMEM;
1637                 goto out_destroy_counters;
1638         }
1639
1640         error = xfs_readsb(mp, flags);
1641         if (error)
1642                 goto out_free_stats;
1643
1644         error = xfs_finish_flags(mp);
1645         if (error)
1646                 goto out_free_sb;
1647
1648         error = xfs_setup_devices(mp);
1649         if (error)
1650                 goto out_free_sb;
1651
1652         error = xfs_filestream_mount(mp);
1653         if (error)
1654                 goto out_free_sb;
1655
1656         /*
1657          * we must configure the block size in the superblock before we run the
1658          * full mount process as the mount process can lookup and cache inodes.
1659          */
1660         sb->s_magic = XFS_SUPER_MAGIC;
1661         sb->s_blocksize = mp->m_sb.sb_blocksize;
1662         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1663         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1664         sb->s_max_links = XFS_MAXLINK;
1665         sb->s_time_gran = 1;
1666         sb->s_time_min = S32_MIN;
1667         sb->s_time_max = S32_MAX;
1668         sb->s_iflags |= SB_I_CGROUPWB;
1669
1670         set_posix_acl_flag(sb);
1671
1672         /* version 5 superblocks support inode version counters. */
1673         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1674                 sb->s_flags |= SB_I_VERSION;
1675
1676         if (mp->m_flags & XFS_MOUNT_DAX) {
1677                 bool rtdev_is_dax = false, datadev_is_dax;
1678
1679                 xfs_warn(mp,
1680                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1681
1682                 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1683                         sb->s_blocksize);
1684                 if (mp->m_rtdev_targp)
1685                         rtdev_is_dax = bdev_dax_supported(
1686                                 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1687                 if (!rtdev_is_dax && !datadev_is_dax) {
1688                         xfs_alert(mp,
1689                         "DAX unsupported by block device. Turning off DAX.");
1690                         mp->m_flags &= ~XFS_MOUNT_DAX;
1691                 }
1692                 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1693                         xfs_alert(mp,
1694                 "DAX and reflink cannot be used together!");
1695                         error = -EINVAL;
1696                         goto out_filestream_unmount;
1697                 }
1698         }
1699
1700         if (mp->m_flags & XFS_MOUNT_DISCARD) {
1701                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1702
1703                 if (!blk_queue_discard(q)) {
1704                         xfs_warn(mp, "mounting with \"discard\" option, but "
1705                                         "the device does not support discard");
1706                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
1707                 }
1708         }
1709
1710         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1711                 if (mp->m_sb.sb_rblocks) {
1712                         xfs_alert(mp,
1713         "reflink not compatible with realtime device!");
1714                         error = -EINVAL;
1715                         goto out_filestream_unmount;
1716                 }
1717
1718                 if (xfs_globals.always_cow) {
1719                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1720                         mp->m_always_cow = true;
1721                 }
1722         }
1723
1724         if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1725                 xfs_alert(mp,
1726         "reverse mapping btree not compatible with realtime device!");
1727                 error = -EINVAL;
1728                 goto out_filestream_unmount;
1729         }
1730
1731         error = xfs_mountfs(mp);
1732         if (error)
1733                 goto out_filestream_unmount;
1734
1735         root = igrab(VFS_I(mp->m_rootip));
1736         if (!root) {
1737                 error = -ENOENT;
1738                 goto out_unmount;
1739         }
1740         sb->s_root = d_make_root(root);
1741         if (!sb->s_root) {
1742                 error = -ENOMEM;
1743                 goto out_unmount;
1744         }
1745
1746         return 0;
1747
1748  out_filestream_unmount:
1749         xfs_filestream_unmount(mp);
1750  out_free_sb:
1751         xfs_freesb(mp);
1752  out_free_stats:
1753         free_percpu(mp->m_stats.xs_stats);
1754  out_destroy_counters:
1755         xfs_destroy_percpu_counters(mp);
1756  out_destroy_workqueues:
1757         xfs_destroy_mount_workqueues(mp);
1758  out_close_devices:
1759         xfs_close_devices(mp);
1760  out_free_fsname:
1761         sb->s_fs_info = NULL;
1762         xfs_free_fsname(mp);
1763         kfree(mp);
1764  out:
1765         return error;
1766
1767  out_unmount:
1768         xfs_filestream_unmount(mp);
1769         xfs_unmountfs(mp);
1770         goto out_free_sb;
1771 }
1772
1773 STATIC void
1774 xfs_fs_put_super(
1775         struct super_block      *sb)
1776 {
1777         struct xfs_mount        *mp = XFS_M(sb);
1778
1779         /* if ->fill_super failed, we have no mount to tear down */
1780         if (!sb->s_fs_info)
1781                 return;
1782
1783         xfs_notice(mp, "Unmounting Filesystem");
1784         xfs_filestream_unmount(mp);
1785         xfs_unmountfs(mp);
1786
1787         xfs_freesb(mp);
1788         free_percpu(mp->m_stats.xs_stats);
1789         xfs_destroy_percpu_counters(mp);
1790         xfs_destroy_mount_workqueues(mp);
1791         xfs_close_devices(mp);
1792
1793         sb->s_fs_info = NULL;
1794         xfs_free_fsname(mp);
1795         kfree(mp);
1796 }
1797
1798 STATIC struct dentry *
1799 xfs_fs_mount(
1800         struct file_system_type *fs_type,
1801         int                     flags,
1802         const char              *dev_name,
1803         void                    *data)
1804 {
1805         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1806 }
1807
1808 static long
1809 xfs_fs_nr_cached_objects(
1810         struct super_block      *sb,
1811         struct shrink_control   *sc)
1812 {
1813         /* Paranoia: catch incorrect calls during mount setup or teardown */
1814         if (WARN_ON_ONCE(!sb->s_fs_info))
1815                 return 0;
1816         return xfs_reclaim_inodes_count(XFS_M(sb));
1817 }
1818
1819 static long
1820 xfs_fs_free_cached_objects(
1821         struct super_block      *sb,
1822         struct shrink_control   *sc)
1823 {
1824         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1825 }
1826
1827 static const struct super_operations xfs_super_operations = {
1828         .alloc_inode            = xfs_fs_alloc_inode,
1829         .destroy_inode          = xfs_fs_destroy_inode,
1830         .dirty_inode            = xfs_fs_dirty_inode,
1831         .drop_inode             = xfs_fs_drop_inode,
1832         .put_super              = xfs_fs_put_super,
1833         .sync_fs                = xfs_fs_sync_fs,
1834         .freeze_fs              = xfs_fs_freeze,
1835         .unfreeze_fs            = xfs_fs_unfreeze,
1836         .statfs                 = xfs_fs_statfs,
1837         .remount_fs             = xfs_fs_remount,
1838         .show_options           = xfs_fs_show_options,
1839         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1840         .free_cached_objects    = xfs_fs_free_cached_objects,
1841 };
1842
1843 static struct file_system_type xfs_fs_type = {
1844         .owner                  = THIS_MODULE,
1845         .name                   = "xfs",
1846         .mount                  = xfs_fs_mount,
1847         .kill_sb                = kill_block_super,
1848         .fs_flags               = FS_REQUIRES_DEV,
1849 };
1850 MODULE_ALIAS_FS("xfs");
1851
1852 STATIC int __init
1853 xfs_init_zones(void)
1854 {
1855         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1856                                                 "xfs_log_ticket");
1857         if (!xfs_log_ticket_zone)
1858                 goto out;
1859
1860         xfs_bmap_free_item_zone = kmem_zone_init(
1861                         sizeof(struct xfs_extent_free_item),
1862                         "xfs_bmap_free_item");
1863         if (!xfs_bmap_free_item_zone)
1864                 goto out_destroy_log_ticket_zone;
1865
1866         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1867                                                 "xfs_btree_cur");
1868         if (!xfs_btree_cur_zone)
1869                 goto out_destroy_bmap_free_item_zone;
1870
1871         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1872                                                 "xfs_da_state");
1873         if (!xfs_da_state_zone)
1874                 goto out_destroy_btree_cur_zone;
1875
1876         xfs_ifork_zone = kmem_zone_init(sizeof(struct xfs_ifork), "xfs_ifork");
1877         if (!xfs_ifork_zone)
1878                 goto out_destroy_da_state_zone;
1879
1880         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1881         if (!xfs_trans_zone)
1882                 goto out_destroy_ifork_zone;
1883
1884
1885         /*
1886          * The size of the zone allocated buf log item is the maximum
1887          * size possible under XFS.  This wastes a little bit of memory,
1888          * but it is much faster.
1889          */
1890         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1891                                            "xfs_buf_item");
1892         if (!xfs_buf_item_zone)
1893                 goto out_destroy_trans_zone;
1894
1895         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1896                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1897                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1898         if (!xfs_efd_zone)
1899                 goto out_destroy_buf_item_zone;
1900
1901         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1902                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1903                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1904         if (!xfs_efi_zone)
1905                 goto out_destroy_efd_zone;
1906
1907         xfs_inode_zone =
1908                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1909                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1910                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1911         if (!xfs_inode_zone)
1912                 goto out_destroy_efi_zone;
1913
1914         xfs_ili_zone =
1915                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1916                                         KM_ZONE_SPREAD, NULL);
1917         if (!xfs_ili_zone)
1918                 goto out_destroy_inode_zone;
1919         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1920                                         "xfs_icr");
1921         if (!xfs_icreate_zone)
1922                 goto out_destroy_ili_zone;
1923
1924         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1925                         "xfs_rud_item");
1926         if (!xfs_rud_zone)
1927                 goto out_destroy_icreate_zone;
1928
1929         xfs_rui_zone = kmem_zone_init(
1930                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1931                         "xfs_rui_item");
1932         if (!xfs_rui_zone)
1933                 goto out_destroy_rud_zone;
1934
1935         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1936                         "xfs_cud_item");
1937         if (!xfs_cud_zone)
1938                 goto out_destroy_rui_zone;
1939
1940         xfs_cui_zone = kmem_zone_init(
1941                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1942                         "xfs_cui_item");
1943         if (!xfs_cui_zone)
1944                 goto out_destroy_cud_zone;
1945
1946         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1947                         "xfs_bud_item");
1948         if (!xfs_bud_zone)
1949                 goto out_destroy_cui_zone;
1950
1951         xfs_bui_zone = kmem_zone_init(
1952                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1953                         "xfs_bui_item");
1954         if (!xfs_bui_zone)
1955                 goto out_destroy_bud_zone;
1956
1957         return 0;
1958
1959  out_destroy_bud_zone:
1960         kmem_zone_destroy(xfs_bud_zone);
1961  out_destroy_cui_zone:
1962         kmem_zone_destroy(xfs_cui_zone);
1963  out_destroy_cud_zone:
1964         kmem_zone_destroy(xfs_cud_zone);
1965  out_destroy_rui_zone:
1966         kmem_zone_destroy(xfs_rui_zone);
1967  out_destroy_rud_zone:
1968         kmem_zone_destroy(xfs_rud_zone);
1969  out_destroy_icreate_zone:
1970         kmem_zone_destroy(xfs_icreate_zone);
1971  out_destroy_ili_zone:
1972         kmem_zone_destroy(xfs_ili_zone);
1973  out_destroy_inode_zone:
1974         kmem_zone_destroy(xfs_inode_zone);
1975  out_destroy_efi_zone:
1976         kmem_zone_destroy(xfs_efi_zone);
1977  out_destroy_efd_zone:
1978         kmem_zone_destroy(xfs_efd_zone);
1979  out_destroy_buf_item_zone:
1980         kmem_zone_destroy(xfs_buf_item_zone);
1981  out_destroy_trans_zone:
1982         kmem_zone_destroy(xfs_trans_zone);
1983  out_destroy_ifork_zone:
1984         kmem_zone_destroy(xfs_ifork_zone);
1985  out_destroy_da_state_zone:
1986         kmem_zone_destroy(xfs_da_state_zone);
1987  out_destroy_btree_cur_zone:
1988         kmem_zone_destroy(xfs_btree_cur_zone);
1989  out_destroy_bmap_free_item_zone:
1990         kmem_zone_destroy(xfs_bmap_free_item_zone);
1991  out_destroy_log_ticket_zone:
1992         kmem_zone_destroy(xfs_log_ticket_zone);
1993  out:
1994         return -ENOMEM;
1995 }
1996
1997 STATIC void
1998 xfs_destroy_zones(void)
1999 {
2000         /*
2001          * Make sure all delayed rcu free are flushed before we
2002          * destroy caches.
2003          */
2004         rcu_barrier();
2005         kmem_zone_destroy(xfs_bui_zone);
2006         kmem_zone_destroy(xfs_bud_zone);
2007         kmem_zone_destroy(xfs_cui_zone);
2008         kmem_zone_destroy(xfs_cud_zone);
2009         kmem_zone_destroy(xfs_rui_zone);
2010         kmem_zone_destroy(xfs_rud_zone);
2011         kmem_zone_destroy(xfs_icreate_zone);
2012         kmem_zone_destroy(xfs_ili_zone);
2013         kmem_zone_destroy(xfs_inode_zone);
2014         kmem_zone_destroy(xfs_efi_zone);
2015         kmem_zone_destroy(xfs_efd_zone);
2016         kmem_zone_destroy(xfs_buf_item_zone);
2017         kmem_zone_destroy(xfs_trans_zone);
2018         kmem_zone_destroy(xfs_ifork_zone);
2019         kmem_zone_destroy(xfs_da_state_zone);
2020         kmem_zone_destroy(xfs_btree_cur_zone);
2021         kmem_zone_destroy(xfs_bmap_free_item_zone);
2022         kmem_zone_destroy(xfs_log_ticket_zone);
2023 }
2024
2025 STATIC int __init
2026 xfs_init_workqueues(void)
2027 {
2028         /*
2029          * The allocation workqueue can be used in memory reclaim situations
2030          * (writepage path), and parallelism is only limited by the number of
2031          * AGs in all the filesystems mounted. Hence use the default large
2032          * max_active value for this workqueue.
2033          */
2034         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2035                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2036         if (!xfs_alloc_wq)
2037                 return -ENOMEM;
2038
2039         xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2040         if (!xfs_discard_wq)
2041                 goto out_free_alloc_wq;
2042
2043         return 0;
2044 out_free_alloc_wq:
2045         destroy_workqueue(xfs_alloc_wq);
2046         return -ENOMEM;
2047 }
2048
2049 STATIC void
2050 xfs_destroy_workqueues(void)
2051 {
2052         destroy_workqueue(xfs_discard_wq);
2053         destroy_workqueue(xfs_alloc_wq);
2054 }
2055
2056 STATIC int __init
2057 init_xfs_fs(void)
2058 {
2059         int                     error;
2060
2061         xfs_check_ondisk_structs();
2062
2063         printk(KERN_INFO XFS_VERSION_STRING " with "
2064                          XFS_BUILD_OPTIONS " enabled\n");
2065
2066         xfs_dir_startup();
2067
2068         error = xfs_init_zones();
2069         if (error)
2070                 goto out;
2071
2072         error = xfs_init_workqueues();
2073         if (error)
2074                 goto out_destroy_zones;
2075
2076         error = xfs_mru_cache_init();
2077         if (error)
2078                 goto out_destroy_wq;
2079
2080         error = xfs_buf_init();
2081         if (error)
2082                 goto out_mru_cache_uninit;
2083
2084         error = xfs_init_procfs();
2085         if (error)
2086                 goto out_buf_terminate;
2087
2088         error = xfs_sysctl_register();
2089         if (error)
2090                 goto out_cleanup_procfs;
2091
2092         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2093         if (!xfs_kset) {
2094                 error = -ENOMEM;
2095                 goto out_sysctl_unregister;
2096         }
2097
2098         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2099
2100         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2101         if (!xfsstats.xs_stats) {
2102                 error = -ENOMEM;
2103                 goto out_kset_unregister;
2104         }
2105
2106         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2107                                "stats");
2108         if (error)
2109                 goto out_free_stats;
2110
2111 #ifdef DEBUG
2112         xfs_dbg_kobj.kobject.kset = xfs_kset;
2113         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2114         if (error)
2115                 goto out_remove_stats_kobj;
2116 #endif
2117
2118         error = xfs_qm_init();
2119         if (error)
2120                 goto out_remove_dbg_kobj;
2121
2122         error = register_filesystem(&xfs_fs_type);
2123         if (error)
2124                 goto out_qm_exit;
2125         return 0;
2126
2127  out_qm_exit:
2128         xfs_qm_exit();
2129  out_remove_dbg_kobj:
2130 #ifdef DEBUG
2131         xfs_sysfs_del(&xfs_dbg_kobj);
2132  out_remove_stats_kobj:
2133 #endif
2134         xfs_sysfs_del(&xfsstats.xs_kobj);
2135  out_free_stats:
2136         free_percpu(xfsstats.xs_stats);
2137  out_kset_unregister:
2138         kset_unregister(xfs_kset);
2139  out_sysctl_unregister:
2140         xfs_sysctl_unregister();
2141  out_cleanup_procfs:
2142         xfs_cleanup_procfs();
2143  out_buf_terminate:
2144         xfs_buf_terminate();
2145  out_mru_cache_uninit:
2146         xfs_mru_cache_uninit();
2147  out_destroy_wq:
2148         xfs_destroy_workqueues();
2149  out_destroy_zones:
2150         xfs_destroy_zones();
2151  out:
2152         return error;
2153 }
2154
2155 STATIC void __exit
2156 exit_xfs_fs(void)
2157 {
2158         xfs_qm_exit();
2159         unregister_filesystem(&xfs_fs_type);
2160 #ifdef DEBUG
2161         xfs_sysfs_del(&xfs_dbg_kobj);
2162 #endif
2163         xfs_sysfs_del(&xfsstats.xs_kobj);
2164         free_percpu(xfsstats.xs_stats);
2165         kset_unregister(xfs_kset);
2166         xfs_sysctl_unregister();
2167         xfs_cleanup_procfs();
2168         xfs_buf_terminate();
2169         xfs_mru_cache_uninit();
2170         xfs_destroy_workqueues();
2171         xfs_destroy_zones();
2172         xfs_uuid_table_free();
2173 }
2174
2175 module_init(init_xfs_fs);
2176 module_exit(exit_xfs_fs);
2177
2178 MODULE_AUTHOR("Silicon Graphics, Inc.");
2179 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2180 MODULE_LICENSE("GPL");