linux/fs/xfs/xfs_super.c
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   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_log.h"
  21#include "xfs_inum.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_dir2.h"
  26#include "xfs_alloc.h"
  27#include "xfs_quota.h"
  28#include "xfs_mount.h"
  29#include "xfs_bmap_btree.h"
  30#include "xfs_alloc_btree.h"
  31#include "xfs_ialloc_btree.h"
  32#include "xfs_dinode.h"
  33#include "xfs_inode.h"
  34#include "xfs_btree.h"
  35#include "xfs_ialloc.h"
  36#include "xfs_bmap.h"
  37#include "xfs_rtalloc.h"
  38#include "xfs_error.h"
  39#include "xfs_itable.h"
  40#include "xfs_fsops.h"
  41#include "xfs_attr.h"
  42#include "xfs_buf_item.h"
  43#include "xfs_utils.h"
  44#include "xfs_vnodeops.h"
  45#include "xfs_log_priv.h"
  46#include "xfs_trans_priv.h"
  47#include "xfs_filestream.h"
  48#include "xfs_da_btree.h"
  49#include "xfs_extfree_item.h"
  50#include "xfs_mru_cache.h"
  51#include "xfs_inode_item.h"
  52#include "xfs_sync.h"
  53#include "xfs_trace.h"
  54
  55#include <linux/namei.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
  65static const struct super_operations xfs_super_operations;
  66static kmem_zone_t *xfs_ioend_zone;
  67mempool_t *xfs_ioend_pool;
  68
  69#define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
  70#define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
  71#define MNTOPT_LOGDEV   "logdev"        /* log device */
  72#define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
  73#define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
  74#define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
  75#define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
  76#define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
  77#define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
  78#define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
  79#define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
  80#define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
  81#define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
  82#define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
  83#define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
  84#define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
  85#define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
  86#define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
  87#define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
  88                                         * unwritten extent conversion */
  89#define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
  90#define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
  91#define MNTOPT_32BITINODE   "inode32"   /* inode allocation limited to
  92                                         * XFS_MAXINUMBER_32 */
  93#define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
  94#define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
  95#define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
  96#define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
  97                                         * in stat(). */
  98#define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
  99#define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
 100#define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
 101#define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
 102#define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
 103#define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
 104#define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
 105#define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
 106#define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
 107#define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
 108#define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
 109#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
 110#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
 111#define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
 112#define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
 113#define MNTOPT_DELAYLOG    "delaylog"   /* Delayed logging enabled */
 114#define MNTOPT_NODELAYLOG  "nodelaylog" /* Delayed logging disabled */
 115#define MNTOPT_DISCARD     "discard"    /* Discard unused blocks */
 116#define MNTOPT_NODISCARD   "nodiscard"  /* Do not discard unused blocks */
 117
 118/*
 119 * Table driven mount option parser.
 120 *
 121 * Currently only used for remount, but it will be used for mount
 122 * in the future, too.
 123 */
 124enum {
 125        Opt_barrier,
 126        Opt_nobarrier,
 127        Opt_inode64,
 128        Opt_inode32,
 129        Opt_err
 130};
 131
 132static const match_table_t tokens = {
 133        {Opt_barrier, "barrier"},
 134        {Opt_nobarrier, "nobarrier"},
 135        {Opt_inode64, "inode64"},
 136        {Opt_inode32, "inode32"},
 137        {Opt_err, NULL}
 138};
 139
 140
 141STATIC unsigned long
 142suffix_strtoul(char *s, char **endp, unsigned int base)
 143{
 144        int     last, shift_left_factor = 0;
 145        char    *value = s;
 146
 147        last = strlen(value) - 1;
 148        if (value[last] == 'K' || value[last] == 'k') {
 149                shift_left_factor = 10;
 150                value[last] = '\0';
 151        }
 152        if (value[last] == 'M' || value[last] == 'm') {
 153                shift_left_factor = 20;
 154                value[last] = '\0';
 155        }
 156        if (value[last] == 'G' || value[last] == 'g') {
 157                shift_left_factor = 30;
 158                value[last] = '\0';
 159        }
 160
 161        return simple_strtoul((const char *)s, endp, base) << shift_left_factor;
 162}
 163
 164/*
 165 * This function fills in xfs_mount_t fields based on mount args.
 166 * Note: the superblock has _not_ yet been read in.
 167 *
 168 * Note that this function leaks the various device name allocations on
 169 * failure.  The caller takes care of them.
 170 */
 171STATIC int
 172xfs_parseargs(
 173        struct xfs_mount        *mp,
 174        char                    *options)
 175{
 176        struct super_block      *sb = mp->m_super;
 177        char                    *this_char, *value, *eov;
 178        int                     dsunit = 0;
 179        int                     dswidth = 0;
 180        int                     iosize = 0;
 181        __uint8_t               iosizelog = 0;
 182
 183        /*
 184         * set up the mount name first so all the errors will refer to the
 185         * correct device.
 186         */
 187        mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
 188        if (!mp->m_fsname)
 189                return ENOMEM;
 190        mp->m_fsname_len = strlen(mp->m_fsname) + 1;
 191
 192        /*
 193         * Copy binary VFS mount flags we are interested in.
 194         */
 195        if (sb->s_flags & MS_RDONLY)
 196                mp->m_flags |= XFS_MOUNT_RDONLY;
 197        if (sb->s_flags & MS_DIRSYNC)
 198                mp->m_flags |= XFS_MOUNT_DIRSYNC;
 199        if (sb->s_flags & MS_SYNCHRONOUS)
 200                mp->m_flags |= XFS_MOUNT_WSYNC;
 201
 202        /*
 203         * Set some default flags that could be cleared by the mount option
 204         * parsing.
 205         */
 206        mp->m_flags |= XFS_MOUNT_BARRIER;
 207        mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 208#if !XFS_BIG_INUMS
 209        mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 210#endif
 211
 212        /*
 213         * These can be overridden by the mount option parsing.
 214         */
 215        mp->m_logbufs = -1;
 216        mp->m_logbsize = -1;
 217
 218        if (!options)
 219                goto done;
 220
 221        while ((this_char = strsep(&options, ",")) != NULL) {
 222                if (!*this_char)
 223                        continue;
 224                if ((value = strchr(this_char, '=')) != NULL)
 225                        *value++ = 0;
 226
 227                if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
 228                        if (!value || !*value) {
 229                                xfs_warn(mp, "%s option requires an argument",
 230                                        this_char);
 231                                return EINVAL;
 232                        }
 233                        mp->m_logbufs = simple_strtoul(value, &eov, 10);
 234                } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
 235                        if (!value || !*value) {
 236                                xfs_warn(mp, "%s option requires an argument",
 237                                        this_char);
 238                                return EINVAL;
 239                        }
 240                        mp->m_logbsize = suffix_strtoul(value, &eov, 10);
 241                } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
 242                        if (!value || !*value) {
 243                                xfs_warn(mp, "%s option requires an argument",
 244                                        this_char);
 245                                return EINVAL;
 246                        }
 247                        mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
 248                        if (!mp->m_logname)
 249                                return ENOMEM;
 250                } else if (!strcmp(this_char, MNTOPT_MTPT)) {
 251                        xfs_warn(mp, "%s option not allowed on this system",
 252                                this_char);
 253                        return EINVAL;
 254                } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
 255                        if (!value || !*value) {
 256                                xfs_warn(mp, "%s option requires an argument",
 257                                        this_char);
 258                                return EINVAL;
 259                        }
 260                        mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
 261                        if (!mp->m_rtname)
 262                                return ENOMEM;
 263                } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
 264                        if (!value || !*value) {
 265                                xfs_warn(mp, "%s option requires an argument",
 266                                        this_char);
 267                                return EINVAL;
 268                        }
 269                        iosize = simple_strtoul(value, &eov, 10);
 270                        iosizelog = ffs(iosize) - 1;
 271                } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
 272                        if (!value || !*value) {
 273                                xfs_warn(mp, "%s option requires an argument",
 274                                        this_char);
 275                                return EINVAL;
 276                        }
 277                        iosize = suffix_strtoul(value, &eov, 10);
 278                        iosizelog = ffs(iosize) - 1;
 279                } else if (!strcmp(this_char, MNTOPT_GRPID) ||
 280                           !strcmp(this_char, MNTOPT_BSDGROUPS)) {
 281                        mp->m_flags |= XFS_MOUNT_GRPID;
 282                } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
 283                           !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
 284                        mp->m_flags &= ~XFS_MOUNT_GRPID;
 285                } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
 286                        mp->m_flags |= XFS_MOUNT_WSYNC;
 287                } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
 288                        mp->m_flags |= XFS_MOUNT_NORECOVERY;
 289                } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
 290                        mp->m_flags |= XFS_MOUNT_NOALIGN;
 291                } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
 292                        mp->m_flags |= XFS_MOUNT_SWALLOC;
 293                } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
 294                        if (!value || !*value) {
 295                                xfs_warn(mp, "%s option requires an argument",
 296                                        this_char);
 297                                return EINVAL;
 298                        }
 299                        dsunit = simple_strtoul(value, &eov, 10);
 300                } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
 301                        if (!value || !*value) {
 302                                xfs_warn(mp, "%s option requires an argument",
 303                                        this_char);
 304                                return EINVAL;
 305                        }
 306                        dswidth = simple_strtoul(value, &eov, 10);
 307                } else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
 308                        mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
 309                } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
 310                        mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
 311#if !XFS_BIG_INUMS
 312                        xfs_warn(mp, "%s option not allowed on this system",
 313                                this_char);
 314                        return EINVAL;
 315#endif
 316                } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
 317                        mp->m_flags |= XFS_MOUNT_NOUUID;
 318                } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
 319                        mp->m_flags |= XFS_MOUNT_BARRIER;
 320                } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
 321                        mp->m_flags &= ~XFS_MOUNT_BARRIER;
 322                } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
 323                        mp->m_flags |= XFS_MOUNT_IKEEP;
 324                } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
 325                        mp->m_flags &= ~XFS_MOUNT_IKEEP;
 326                } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
 327                        mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
 328                } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
 329                        mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 330                } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
 331                        mp->m_flags |= XFS_MOUNT_ATTR2;
 332                } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
 333                        mp->m_flags &= ~XFS_MOUNT_ATTR2;
 334                        mp->m_flags |= XFS_MOUNT_NOATTR2;
 335                } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
 336                        mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 337                } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
 338                        mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
 339                        mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
 340                        mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
 341                } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
 342                           !strcmp(this_char, MNTOPT_UQUOTA) ||
 343                           !strcmp(this_char, MNTOPT_USRQUOTA)) {
 344                        mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
 345                                         XFS_UQUOTA_ENFD);
 346                } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
 347                           !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
 348                        mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
 349                        mp->m_qflags &= ~XFS_UQUOTA_ENFD;
 350                } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
 351                           !strcmp(this_char, MNTOPT_PRJQUOTA)) {
 352                        mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
 353                                         XFS_OQUOTA_ENFD);
 354                } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
 355                        mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
 356                        mp->m_qflags &= ~XFS_OQUOTA_ENFD;
 357                } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
 358                           !strcmp(this_char, MNTOPT_GRPQUOTA)) {
 359                        mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
 360                                         XFS_OQUOTA_ENFD);
 361                } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
 362                        mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
 363                        mp->m_qflags &= ~XFS_OQUOTA_ENFD;
 364                } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
 365                        xfs_warn(mp,
 366        "delaylog is the default now, option is deprecated.");
 367                } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
 368                        xfs_warn(mp,
 369        "nodelaylog support has been removed, option is deprecated.");
 370                } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
 371                        mp->m_flags |= XFS_MOUNT_DISCARD;
 372                } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
 373                        mp->m_flags &= ~XFS_MOUNT_DISCARD;
 374                } else if (!strcmp(this_char, "ihashsize")) {
 375                        xfs_warn(mp,
 376        "ihashsize no longer used, option is deprecated.");
 377                } else if (!strcmp(this_char, "osyncisdsync")) {
 378                        xfs_warn(mp,
 379        "osyncisdsync has no effect, option is deprecated.");
 380                } else if (!strcmp(this_char, "osyncisosync")) {
 381                        xfs_warn(mp,
 382        "osyncisosync has no effect, option is deprecated.");
 383                } else if (!strcmp(this_char, "irixsgid")) {
 384                        xfs_warn(mp,
 385        "irixsgid is now a sysctl(2) variable, option is deprecated.");
 386                } else {
 387                        xfs_warn(mp, "unknown mount option [%s].", this_char);
 388                        return EINVAL;
 389                }
 390        }
 391
 392        /*
 393         * no recovery flag requires a read-only mount
 394         */
 395        if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
 396            !(mp->m_flags & XFS_MOUNT_RDONLY)) {
 397                xfs_warn(mp, "no-recovery mounts must be read-only.");
 398                return EINVAL;
 399        }
 400
 401        if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
 402                xfs_warn(mp,
 403        "sunit and swidth options incompatible with the noalign option");
 404                return EINVAL;
 405        }
 406
 407#ifndef CONFIG_XFS_QUOTA
 408        if (XFS_IS_QUOTA_RUNNING(mp)) {
 409                xfs_warn(mp, "quota support not available in this kernel.");
 410                return EINVAL;
 411        }
 412#endif
 413
 414        if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
 415            (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
 416                xfs_warn(mp, "cannot mount with both project and group quota");
 417                return EINVAL;
 418        }
 419
 420        if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 421                xfs_warn(mp, "sunit and swidth must be specified together");
 422                return EINVAL;
 423        }
 424
 425        if (dsunit && (dswidth % dsunit != 0)) {
 426                xfs_warn(mp,
 427        "stripe width (%d) must be a multiple of the stripe unit (%d)",
 428                        dswidth, dsunit);
 429                return EINVAL;
 430        }
 431
 432done:
 433        if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) {
 434                /*
 435                 * At this point the superblock has not been read
 436                 * in, therefore we do not know the block size.
 437                 * Before the mount call ends we will convert
 438                 * these to FSBs.
 439                 */
 440                if (dsunit) {
 441                        mp->m_dalign = dsunit;
 442                        mp->m_flags |= XFS_MOUNT_RETERR;
 443                }
 444
 445                if (dswidth)
 446                        mp->m_swidth = dswidth;
 447        }
 448
 449        if (mp->m_logbufs != -1 &&
 450            mp->m_logbufs != 0 &&
 451            (mp->m_logbufs < XLOG_MIN_ICLOGS ||
 452             mp->m_logbufs > XLOG_MAX_ICLOGS)) {
 453                xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
 454                        mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 455                return XFS_ERROR(EINVAL);
 456        }
 457        if (mp->m_logbsize != -1 &&
 458            mp->m_logbsize !=  0 &&
 459            (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
 460             mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
 461             !is_power_of_2(mp->m_logbsize))) {
 462                xfs_warn(mp,
 463                        "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 464                        mp->m_logbsize);
 465                return XFS_ERROR(EINVAL);
 466        }
 467
 468        if (iosizelog) {
 469                if (iosizelog > XFS_MAX_IO_LOG ||
 470                    iosizelog < XFS_MIN_IO_LOG) {
 471                        xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
 472                                iosizelog, XFS_MIN_IO_LOG,
 473                                XFS_MAX_IO_LOG);
 474                        return XFS_ERROR(EINVAL);
 475                }
 476
 477                mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 478                mp->m_readio_log = iosizelog;
 479                mp->m_writeio_log = iosizelog;
 480        }
 481
 482        return 0;
 483}
 484
 485struct proc_xfs_info {
 486        int     flag;
 487        char    *str;
 488};
 489
 490STATIC int
 491xfs_showargs(
 492        struct xfs_mount        *mp,
 493        struct seq_file         *m)
 494{
 495        static struct proc_xfs_info xfs_info_set[] = {
 496                /* the few simple ones we can get from the mount struct */
 497                { XFS_MOUNT_IKEEP,              "," MNTOPT_IKEEP },
 498                { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
 499                { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
 500                { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
 501                { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
 502                { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
 503                { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
 504                { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
 505                { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
 506                { XFS_MOUNT_DISCARD,            "," MNTOPT_DISCARD },
 507                { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_32BITINODE },
 508                { 0, NULL }
 509        };
 510        static struct proc_xfs_info xfs_info_unset[] = {
 511                /* the few simple ones we can get from the mount struct */
 512                { XFS_MOUNT_COMPAT_IOSIZE,      "," MNTOPT_LARGEIO },
 513                { XFS_MOUNT_BARRIER,            "," MNTOPT_NOBARRIER },
 514                { XFS_MOUNT_SMALL_INUMS,        "," MNTOPT_64BITINODE },
 515                { 0, NULL }
 516        };
 517        struct proc_xfs_info    *xfs_infop;
 518
 519        for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
 520                if (mp->m_flags & xfs_infop->flag)
 521                        seq_puts(m, xfs_infop->str);
 522        }
 523        for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
 524                if (!(mp->m_flags & xfs_infop->flag))
 525                        seq_puts(m, xfs_infop->str);
 526        }
 527
 528        if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
 529                seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
 530                                (int)(1 << mp->m_writeio_log) >> 10);
 531
 532        if (mp->m_logbufs > 0)
 533                seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
 534        if (mp->m_logbsize > 0)
 535                seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
 536
 537        if (mp->m_logname)
 538                seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
 539        if (mp->m_rtname)
 540                seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
 541
 542        if (mp->m_dalign > 0)
 543                seq_printf(m, "," MNTOPT_SUNIT "=%d",
 544                                (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
 545        if (mp->m_swidth > 0)
 546                seq_printf(m, "," MNTOPT_SWIDTH "=%d",
 547                                (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
 548
 549        if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
 550                seq_puts(m, "," MNTOPT_USRQUOTA);
 551        else if (mp->m_qflags & XFS_UQUOTA_ACCT)
 552                seq_puts(m, "," MNTOPT_UQUOTANOENF);
 553
 554        /* Either project or group quotas can be active, not both */
 555
 556        if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 557                if (mp->m_qflags & XFS_OQUOTA_ENFD)
 558                        seq_puts(m, "," MNTOPT_PRJQUOTA);
 559                else
 560                        seq_puts(m, "," MNTOPT_PQUOTANOENF);
 561        } else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 562                if (mp->m_qflags & XFS_OQUOTA_ENFD)
 563                        seq_puts(m, "," MNTOPT_GRPQUOTA);
 564                else
 565                        seq_puts(m, "," MNTOPT_GQUOTANOENF);
 566        }
 567
 568        if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 569                seq_puts(m, "," MNTOPT_NOQUOTA);
 570
 571        return 0;
 572}
 573__uint64_t
 574xfs_max_file_offset(
 575        unsigned int            blockshift)
 576{
 577        unsigned int            pagefactor = 1;
 578        unsigned int            bitshift = BITS_PER_LONG - 1;
 579
 580        /* Figure out maximum filesize, on Linux this can depend on
 581         * the filesystem blocksize (on 32 bit platforms).
 582         * __block_write_begin does this in an [unsigned] long...
 583         *      page->index << (PAGE_CACHE_SHIFT - bbits)
 584         * So, for page sized blocks (4K on 32 bit platforms),
 585         * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 586         *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
 587         * but for smaller blocksizes it is less (bbits = log2 bsize).
 588         * Note1: get_block_t takes a long (implicit cast from above)
 589         * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 590         * can optionally convert the [unsigned] long from above into
 591         * an [unsigned] long long.
 592         */
 593
 594#if BITS_PER_LONG == 32
 595# if defined(CONFIG_LBDAF)
 596        ASSERT(sizeof(sector_t) == 8);
 597        pagefactor = PAGE_CACHE_SIZE;
 598        bitshift = BITS_PER_LONG;
 599# else
 600        pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
 601# endif
 602#endif
 603
 604        return (((__uint64_t)pagefactor) << bitshift) - 1;
 605}
 606
 607xfs_agnumber_t
 608xfs_set_inode32(struct xfs_mount *mp)
 609{
 610        xfs_agnumber_t  index = 0;
 611        xfs_agnumber_t  maxagi = 0;
 612        xfs_sb_t        *sbp = &mp->m_sb;
 613        xfs_agnumber_t  max_metadata;
 614        xfs_agino_t     agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0);
 615        xfs_ino_t       ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino);
 616        xfs_perag_t     *pag;
 617
 618        /* Calculate how much should be reserved for inodes to meet
 619         * the max inode percentage.
 620         */
 621        if (mp->m_maxicount) {
 622                __uint64_t      icount;
 623
 624                icount = sbp->sb_dblocks * sbp->sb_imax_pct;
 625                do_div(icount, 100);
 626                icount += sbp->sb_agblocks - 1;
 627                do_div(icount, sbp->sb_agblocks);
 628                max_metadata = icount;
 629        } else {
 630                max_metadata = sbp->sb_agcount;
 631        }
 632
 633        for (index = 0; index < sbp->sb_agcount; index++) {
 634                ino = XFS_AGINO_TO_INO(mp, index, agino);
 635
 636                if (ino > XFS_MAXINUMBER_32) {
 637                        pag = xfs_perag_get(mp, index);
 638                        pag->pagi_inodeok = 0;
 639                        pag->pagf_metadata = 0;
 640                        xfs_perag_put(pag);
 641                        continue;
 642                }
 643
 644                pag = xfs_perag_get(mp, index);
 645                pag->pagi_inodeok = 1;
 646                maxagi++;
 647                if (index < max_metadata)
 648                        pag->pagf_metadata = 1;
 649                xfs_perag_put(pag);
 650        }
 651        mp->m_flags |= (XFS_MOUNT_32BITINODES |
 652                        XFS_MOUNT_SMALL_INUMS);
 653
 654        return maxagi;
 655}
 656
 657xfs_agnumber_t
 658xfs_set_inode64(struct xfs_mount *mp)
 659{
 660        xfs_agnumber_t index = 0;
 661
 662        for (index = 0; index < mp->m_sb.sb_agcount; index++) {
 663                struct xfs_perag        *pag;
 664
 665                pag = xfs_perag_get(mp, index);
 666                pag->pagi_inodeok = 1;
 667                pag->pagf_metadata = 0;
 668                xfs_perag_put(pag);
 669        }
 670
 671        /* There is no need for lock protection on m_flags,
 672         * the rw_semaphore of the VFS superblock is locked
 673         * during mount/umount/remount operations, so this is
 674         * enough to avoid concurency on the m_flags field
 675         */
 676        mp->m_flags &= ~(XFS_MOUNT_32BITINODES |
 677                         XFS_MOUNT_SMALL_INUMS);
 678        return index;
 679}
 680
 681STATIC int
 682xfs_blkdev_get(
 683        xfs_mount_t             *mp,
 684        const char              *name,
 685        struct block_device     **bdevp)
 686{
 687        int                     error = 0;
 688
 689        *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
 690                                    mp);
 691        if (IS_ERR(*bdevp)) {
 692                error = PTR_ERR(*bdevp);
 693                xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
 694        }
 695
 696        return -error;
 697}
 698
 699STATIC void
 700xfs_blkdev_put(
 701        struct block_device     *bdev)
 702{
 703        if (bdev)
 704                blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 705}
 706
 707void
 708xfs_blkdev_issue_flush(
 709        xfs_buftarg_t           *buftarg)
 710{
 711        blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
 712}
 713
 714STATIC void
 715xfs_close_devices(
 716        struct xfs_mount        *mp)
 717{
 718        if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 719                struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
 720                xfs_free_buftarg(mp, mp->m_logdev_targp);
 721                xfs_blkdev_put(logdev);
 722        }
 723        if (mp->m_rtdev_targp) {
 724                struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
 725                xfs_free_buftarg(mp, mp->m_rtdev_targp);
 726                xfs_blkdev_put(rtdev);
 727        }
 728        xfs_free_buftarg(mp, mp->m_ddev_targp);
 729}
 730
 731/*
 732 * The file system configurations are:
 733 *      (1) device (partition) with data and internal log
 734 *      (2) logical volume with data and log subvolumes.
 735 *      (3) logical volume with data, log, and realtime subvolumes.
 736 *
 737 * We only have to handle opening the log and realtime volumes here if
 738 * they are present.  The data subvolume has already been opened by
 739 * get_sb_bdev() and is stored in sb->s_bdev.
 740 */
 741STATIC int
 742xfs_open_devices(
 743        struct xfs_mount        *mp)
 744{
 745        struct block_device     *ddev = mp->m_super->s_bdev;
 746        struct block_device     *logdev = NULL, *rtdev = NULL;
 747        int                     error;
 748
 749        /*
 750         * Open real time and log devices - order is important.
 751         */
 752        if (mp->m_logname) {
 753                error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
 754                if (error)
 755                        goto out;
 756        }
 757
 758        if (mp->m_rtname) {
 759                error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
 760                if (error)
 761                        goto out_close_logdev;
 762
 763                if (rtdev == ddev || rtdev == logdev) {
 764                        xfs_warn(mp,
 765        "Cannot mount filesystem with identical rtdev and ddev/logdev.");
 766                        error = EINVAL;
 767                        goto out_close_rtdev;
 768                }
 769        }
 770
 771        /*
 772         * Setup xfs_mount buffer target pointers
 773         */
 774        error = ENOMEM;
 775        mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
 776        if (!mp->m_ddev_targp)
 777                goto out_close_rtdev;
 778
 779        if (rtdev) {
 780                mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
 781                                                        mp->m_fsname);
 782                if (!mp->m_rtdev_targp)
 783                        goto out_free_ddev_targ;
 784        }
 785
 786        if (logdev && logdev != ddev) {
 787                mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
 788                                                        mp->m_fsname);
 789                if (!mp->m_logdev_targp)
 790                        goto out_free_rtdev_targ;
 791        } else {
 792                mp->m_logdev_targp = mp->m_ddev_targp;
 793        }
 794
 795        return 0;
 796
 797 out_free_rtdev_targ:
 798        if (mp->m_rtdev_targp)
 799                xfs_free_buftarg(mp, mp->m_rtdev_targp);
 800 out_free_ddev_targ:
 801        xfs_free_buftarg(mp, mp->m_ddev_targp);
 802 out_close_rtdev:
 803        if (rtdev)
 804                xfs_blkdev_put(rtdev);
 805 out_close_logdev:
 806        if (logdev && logdev != ddev)
 807                xfs_blkdev_put(logdev);
 808 out:
 809        return error;
 810}
 811
 812/*
 813 * Setup xfs_mount buffer target pointers based on superblock
 814 */
 815STATIC int
 816xfs_setup_devices(
 817        struct xfs_mount        *mp)
 818{
 819        int                     error;
 820
 821        error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
 822                                    mp->m_sb.sb_sectsize);
 823        if (error)
 824                return error;
 825
 826        if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
 827                unsigned int    log_sector_size = BBSIZE;
 828
 829                if (xfs_sb_version_hassector(&mp->m_sb))
 830                        log_sector_size = mp->m_sb.sb_logsectsize;
 831                error = xfs_setsize_buftarg(mp->m_logdev_targp,
 832                                            mp->m_sb.sb_blocksize,
 833                                            log_sector_size);
 834                if (error)
 835                        return error;
 836        }
 837        if (mp->m_rtdev_targp) {
 838                error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 839                                            mp->m_sb.sb_blocksize,
 840                                            mp->m_sb.sb_sectsize);
 841                if (error)
 842                        return error;
 843        }
 844
 845        return 0;
 846}
 847
 848STATIC int
 849xfs_init_mount_workqueues(
 850        struct xfs_mount        *mp)
 851{
 852        mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
 853                        WQ_MEM_RECLAIM, 0, mp->m_fsname);
 854        if (!mp->m_data_workqueue)
 855                goto out;
 856
 857        mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
 858                        WQ_MEM_RECLAIM, 0, mp->m_fsname);
 859        if (!mp->m_unwritten_workqueue)
 860                goto out_destroy_data_iodone_queue;
 861
 862        mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
 863                        WQ_MEM_RECLAIM, 0, mp->m_fsname);
 864        if (!mp->m_cil_workqueue)
 865                goto out_destroy_unwritten;
 866        return 0;
 867
 868out_destroy_unwritten:
 869        destroy_workqueue(mp->m_unwritten_workqueue);
 870out_destroy_data_iodone_queue:
 871        destroy_workqueue(mp->m_data_workqueue);
 872out:
 873        return -ENOMEM;
 874}
 875
 876STATIC void
 877xfs_destroy_mount_workqueues(
 878        struct xfs_mount        *mp)
 879{
 880        destroy_workqueue(mp->m_cil_workqueue);
 881        destroy_workqueue(mp->m_data_workqueue);
 882        destroy_workqueue(mp->m_unwritten_workqueue);
 883}
 884
 885/* Catch misguided souls that try to use this interface on XFS */
 886STATIC struct inode *
 887xfs_fs_alloc_inode(
 888        struct super_block      *sb)
 889{
 890        BUG();
 891        return NULL;
 892}
 893
 894/*
 895 * Now that the generic code is guaranteed not to be accessing
 896 * the linux inode, we can reclaim the inode.
 897 */
 898STATIC void
 899xfs_fs_destroy_inode(
 900        struct inode            *inode)
 901{
 902        struct xfs_inode        *ip = XFS_I(inode);
 903
 904        trace_xfs_destroy_inode(ip);
 905
 906        XFS_STATS_INC(vn_reclaim);
 907
 908        /* bad inode, get out here ASAP */
 909        if (is_bad_inode(inode))
 910                goto out_reclaim;
 911
 912        ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
 913
 914        /*
 915         * We should never get here with one of the reclaim flags already set.
 916         */
 917        ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
 918        ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
 919
 920        /*
 921         * We always use background reclaim here because even if the
 922         * inode is clean, it still may be under IO and hence we have
 923         * to take the flush lock. The background reclaim path handles
 924         * this more efficiently than we can here, so simply let background
 925         * reclaim tear down all inodes.
 926         */
 927out_reclaim:
 928        xfs_inode_set_reclaim_tag(ip);
 929}
 930
 931/*
 932 * Slab object creation initialisation for the XFS inode.
 933 * This covers only the idempotent fields in the XFS inode;
 934 * all other fields need to be initialised on allocation
 935 * from the slab. This avoids the need to repeatedly initialise
 936 * fields in the xfs inode that left in the initialise state
 937 * when freeing the inode.
 938 */
 939STATIC void
 940xfs_fs_inode_init_once(
 941        void                    *inode)
 942{
 943        struct xfs_inode        *ip = inode;
 944
 945        memset(ip, 0, sizeof(struct xfs_inode));
 946
 947        /* vfs inode */
 948        inode_init_once(VFS_I(ip));
 949
 950        /* xfs inode */
 951        atomic_set(&ip->i_pincount, 0);
 952        spin_lock_init(&ip->i_flags_lock);
 953
 954        mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
 955                     "xfsino", ip->i_ino);
 956}
 957
 958STATIC void
 959xfs_fs_evict_inode(
 960        struct inode            *inode)
 961{
 962        xfs_inode_t             *ip = XFS_I(inode);
 963
 964        ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
 965
 966        trace_xfs_evict_inode(ip);
 967
 968        truncate_inode_pages(&inode->i_data, 0);
 969        clear_inode(inode);
 970        XFS_STATS_INC(vn_rele);
 971        XFS_STATS_INC(vn_remove);
 972        XFS_STATS_DEC(vn_active);
 973
 974        xfs_inactive(ip);
 975}
 976
 977/*
 978 * We do an unlocked check for XFS_IDONTCACHE here because we are already
 979 * serialised against cache hits here via the inode->i_lock and igrab() in
 980 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
 981 * racing with us, and it avoids needing to grab a spinlock here for every inode
 982 * we drop the final reference on.
 983 */
 984STATIC int
 985xfs_fs_drop_inode(
 986        struct inode            *inode)
 987{
 988        struct xfs_inode        *ip = XFS_I(inode);
 989
 990        return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
 991}
 992
 993STATIC void
 994xfs_free_fsname(
 995        struct xfs_mount        *mp)
 996{
 997        kfree(mp->m_fsname);
 998        kfree(mp->m_rtname);
 999        kfree(mp->m_logname);
1000}
1001
1002STATIC void
1003xfs_fs_put_super(
1004        struct super_block      *sb)
1005{
1006        struct xfs_mount        *mp = XFS_M(sb);
1007
1008        xfs_filestream_unmount(mp);
1009        cancel_delayed_work_sync(&mp->m_sync_work);
1010        xfs_unmountfs(mp);
1011        xfs_syncd_stop(mp);
1012        xfs_freesb(mp);
1013        xfs_icsb_destroy_counters(mp);
1014        xfs_destroy_mount_workqueues(mp);
1015        xfs_close_devices(mp);
1016        xfs_free_fsname(mp);
1017        kfree(mp);
1018}
1019
1020STATIC int
1021xfs_fs_sync_fs(
1022        struct super_block      *sb,
1023        int                     wait)
1024{
1025        struct xfs_mount        *mp = XFS_M(sb);
1026        int                     error;
1027
1028        /*
1029         * Doing anything during the async pass would be counterproductive.
1030         */
1031        if (!wait)
1032                return 0;
1033
1034        error = xfs_quiesce_data(mp);
1035        if (error)
1036                return -error;
1037
1038        if (laptop_mode) {
1039                /*
1040                 * The disk must be active because we're syncing.
1041                 * We schedule xfssyncd now (now that the disk is
1042                 * active) instead of later (when it might not be).
1043                 */
1044                flush_delayed_work(&mp->m_sync_work);
1045        }
1046
1047        return 0;
1048}
1049
1050STATIC int
1051xfs_fs_statfs(
1052        struct dentry           *dentry,
1053        struct kstatfs          *statp)
1054{
1055        struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1056        xfs_sb_t                *sbp = &mp->m_sb;
1057        struct xfs_inode        *ip = XFS_I(dentry->d_inode);
1058        __uint64_t              fakeinos, id;
1059        xfs_extlen_t            lsize;
1060        __int64_t               ffree;
1061
1062        statp->f_type = XFS_SB_MAGIC;
1063        statp->f_namelen = MAXNAMELEN - 1;
1064
1065        id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1066        statp->f_fsid.val[0] = (u32)id;
1067        statp->f_fsid.val[1] = (u32)(id >> 32);
1068
1069        xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
1070
1071        spin_lock(&mp->m_sb_lock);
1072        statp->f_bsize = sbp->sb_blocksize;
1073        lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1074        statp->f_blocks = sbp->sb_dblocks - lsize;
1075        statp->f_bfree = statp->f_bavail =
1076                                sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1077        fakeinos = statp->f_bfree << sbp->sb_inopblog;
1078        statp->f_files =
1079            MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1080        if (mp->m_maxicount)
1081                statp->f_files = min_t(typeof(statp->f_files),
1082                                        statp->f_files,
1083                                        mp->m_maxicount);
1084
1085        /* make sure statp->f_ffree does not underflow */
1086        ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
1087        statp->f_ffree = max_t(__int64_t, ffree, 0);
1088
1089        spin_unlock(&mp->m_sb_lock);
1090
1091        if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1092            ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
1093                              (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
1094                xfs_qm_statvfs(ip, statp);
1095        return 0;
1096}
1097
1098STATIC void
1099xfs_save_resvblks(struct xfs_mount *mp)
1100{
1101        __uint64_t resblks = 0;
1102
1103        mp->m_resblks_save = mp->m_resblks;
1104        xfs_reserve_blocks(mp, &resblks, NULL);
1105}
1106
1107STATIC void
1108xfs_restore_resvblks(struct xfs_mount *mp)
1109{
1110        __uint64_t resblks;
1111
1112        if (mp->m_resblks_save) {
1113                resblks = mp->m_resblks_save;
1114                mp->m_resblks_save = 0;
1115        } else
1116                resblks = xfs_default_resblks(mp);
1117
1118        xfs_reserve_blocks(mp, &resblks, NULL);
1119}
1120
1121STATIC int
1122xfs_fs_remount(
1123        struct super_block      *sb,
1124        int                     *flags,
1125        char                    *options)
1126{
1127        struct xfs_mount        *mp = XFS_M(sb);
1128        substring_t             args[MAX_OPT_ARGS];
1129        char                    *p;
1130        int                     error;
1131
1132        while ((p = strsep(&options, ",")) != NULL) {
1133                int token;
1134
1135                if (!*p)
1136                        continue;
1137
1138                token = match_token(p, tokens, args);
1139                switch (token) {
1140                case Opt_barrier:
1141                        mp->m_flags |= XFS_MOUNT_BARRIER;
1142                        break;
1143                case Opt_nobarrier:
1144                        mp->m_flags &= ~XFS_MOUNT_BARRIER;
1145                        break;
1146                case Opt_inode64:
1147                        mp->m_maxagi = xfs_set_inode64(mp);
1148                        break;
1149                case Opt_inode32:
1150                        mp->m_maxagi = xfs_set_inode32(mp);
1151                        break;
1152                default:
1153                        /*
1154                         * Logically we would return an error here to prevent
1155                         * users from believing they might have changed
1156                         * mount options using remount which can't be changed.
1157                         *
1158                         * But unfortunately mount(8) adds all options from
1159                         * mtab and fstab to the mount arguments in some cases
1160                         * so we can't blindly reject options, but have to
1161                         * check for each specified option if it actually
1162                         * differs from the currently set option and only
1163                         * reject it if that's the case.
1164                         *
1165                         * Until that is implemented we return success for
1166                         * every remount request, and silently ignore all
1167                         * options that we can't actually change.
1168                         */
1169#if 0
1170                        xfs_info(mp,
1171                "mount option \"%s\" not supported for remount\n", p);
1172                        return -EINVAL;
1173#else
1174                        break;
1175#endif
1176                }
1177        }
1178
1179        /* ro -> rw */
1180        if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1181                mp->m_flags &= ~XFS_MOUNT_RDONLY;
1182
1183                /*
1184                 * If this is the first remount to writeable state we
1185                 * might have some superblock changes to update.
1186                 */
1187                if (mp->m_update_flags) {
1188                        error = xfs_mount_log_sb(mp, mp->m_update_flags);
1189                        if (error) {
1190                                xfs_warn(mp, "failed to write sb changes");
1191                                return error;
1192                        }
1193                        mp->m_update_flags = 0;
1194                }
1195
1196                /*
1197                 * Fill out the reserve pool if it is empty. Use the stashed
1198                 * value if it is non-zero, otherwise go with the default.
1199                 */
1200                xfs_restore_resvblks(mp);
1201        }
1202
1203        /* rw -> ro */
1204        if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1205                /*
1206                 * After we have synced the data but before we sync the
1207                 * metadata, we need to free up the reserve block pool so that
1208                 * the used block count in the superblock on disk is correct at
1209                 * the end of the remount. Stash the current reserve pool size
1210                 * so that if we get remounted rw, we can return it to the same
1211                 * size.
1212                 */
1213
1214                xfs_quiesce_data(mp);
1215                xfs_save_resvblks(mp);
1216                xfs_quiesce_attr(mp);
1217                mp->m_flags |= XFS_MOUNT_RDONLY;
1218        }
1219
1220        return 0;
1221}
1222
1223/*
1224 * Second stage of a freeze. The data is already frozen so we only
1225 * need to take care of the metadata. Once that's done write a dummy
1226 * record to dirty the log in case of a crash while frozen.
1227 */
1228STATIC int
1229xfs_fs_freeze(
1230        struct super_block      *sb)
1231{
1232        struct xfs_mount        *mp = XFS_M(sb);
1233
1234        xfs_save_resvblks(mp);
1235        xfs_quiesce_attr(mp);
1236        return -xfs_fs_log_dummy(mp);
1237}
1238
1239STATIC int
1240xfs_fs_unfreeze(
1241        struct super_block      *sb)
1242{
1243        struct xfs_mount        *mp = XFS_M(sb);
1244
1245        xfs_restore_resvblks(mp);
1246        return 0;
1247}
1248
1249STATIC int
1250xfs_fs_show_options(
1251        struct seq_file         *m,
1252        struct dentry           *root)
1253{
1254        return -xfs_showargs(XFS_M(root->d_sb), m);
1255}
1256
1257/*
1258 * This function fills in xfs_mount_t fields based on mount args.
1259 * Note: the superblock _has_ now been read in.
1260 */
1261STATIC int
1262xfs_finish_flags(
1263        struct xfs_mount        *mp)
1264{
1265        int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1266
1267        /* Fail a mount where the logbuf is smaller than the log stripe */
1268        if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1269                if (mp->m_logbsize <= 0 &&
1270                    mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1271                        mp->m_logbsize = mp->m_sb.sb_logsunit;
1272                } else if (mp->m_logbsize > 0 &&
1273                           mp->m_logbsize < mp->m_sb.sb_logsunit) {
1274                        xfs_warn(mp,
1275                "logbuf size must be greater than or equal to log stripe size");
1276                        return XFS_ERROR(EINVAL);
1277                }
1278        } else {
1279                /* Fail a mount if the logbuf is larger than 32K */
1280                if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1281                        xfs_warn(mp,
1282                "logbuf size for version 1 logs must be 16K or 32K");
1283                        return XFS_ERROR(EINVAL);
1284                }
1285        }
1286
1287        /*
1288         * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1289         * told by noattr2 to turn it off
1290         */
1291        if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1292            !(mp->m_flags & XFS_MOUNT_NOATTR2))
1293                mp->m_flags |= XFS_MOUNT_ATTR2;
1294
1295        /*
1296         * prohibit r/w mounts of read-only filesystems
1297         */
1298        if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1299                xfs_warn(mp,
1300                        "cannot mount a read-only filesystem as read-write");
1301                return XFS_ERROR(EROFS);
1302        }
1303
1304        return 0;
1305}
1306
1307STATIC int
1308xfs_fs_fill_super(
1309        struct super_block      *sb,
1310        void                    *data,
1311        int                     silent)
1312{
1313        struct inode            *root;
1314        struct xfs_mount        *mp = NULL;
1315        int                     flags = 0, error = ENOMEM;
1316
1317        mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1318        if (!mp)
1319                goto out;
1320
1321        spin_lock_init(&mp->m_sb_lock);
1322        mutex_init(&mp->m_growlock);
1323        atomic_set(&mp->m_active_trans, 0);
1324
1325        mp->m_super = sb;
1326        sb->s_fs_info = mp;
1327
1328        error = xfs_parseargs(mp, (char *)data);
1329        if (error)
1330                goto out_free_fsname;
1331
1332        sb_min_blocksize(sb, BBSIZE);
1333        sb->s_xattr = xfs_xattr_handlers;
1334        sb->s_export_op = &xfs_export_operations;
1335#ifdef CONFIG_XFS_QUOTA
1336        sb->s_qcop = &xfs_quotactl_operations;
1337#endif
1338        sb->s_op = &xfs_super_operations;
1339
1340        if (silent)
1341                flags |= XFS_MFSI_QUIET;
1342
1343        error = xfs_open_devices(mp);
1344        if (error)
1345                goto out_free_fsname;
1346
1347        error = xfs_init_mount_workqueues(mp);
1348        if (error)
1349                goto out_close_devices;
1350
1351        error = xfs_icsb_init_counters(mp);
1352        if (error)
1353                goto out_destroy_workqueues;
1354
1355        error = xfs_readsb(mp, flags);
1356        if (error)
1357                goto out_destroy_counters;
1358
1359        error = xfs_finish_flags(mp);
1360        if (error)
1361                goto out_free_sb;
1362
1363        error = xfs_setup_devices(mp);
1364        if (error)
1365                goto out_free_sb;
1366
1367        error = xfs_filestream_mount(mp);
1368        if (error)
1369                goto out_free_sb;
1370
1371        /*
1372         * we must configure the block size in the superblock before we run the
1373         * full mount process as the mount process can lookup and cache inodes.
1374         * For the same reason we must also initialise the syncd and register
1375         * the inode cache shrinker so that inodes can be reclaimed during
1376         * operations like a quotacheck that iterate all inodes in the
1377         * filesystem.
1378         */
1379        sb->s_magic = XFS_SB_MAGIC;
1380        sb->s_blocksize = mp->m_sb.sb_blocksize;
1381        sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1382        sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1383        sb->s_max_links = XFS_MAXLINK;
1384        sb->s_time_gran = 1;
1385        set_posix_acl_flag(sb);
1386
1387        error = xfs_syncd_init(mp);
1388        if (error)
1389                goto out_filestream_unmount;
1390
1391        error = xfs_mountfs(mp);
1392        if (error)
1393                goto out_syncd_stop;
1394
1395        root = igrab(VFS_I(mp->m_rootip));
1396        if (!root) {
1397                error = ENOENT;
1398                goto out_unmount;
1399        }
1400        if (is_bad_inode(root)) {
1401                error = EINVAL;
1402                goto out_unmount;
1403        }
1404        sb->s_root = d_make_root(root);
1405        if (!sb->s_root) {
1406                error = ENOMEM;
1407                goto out_unmount;
1408        }
1409
1410        return 0;
1411 out_syncd_stop:
1412        xfs_syncd_stop(mp);
1413 out_filestream_unmount:
1414        xfs_filestream_unmount(mp);
1415 out_free_sb:
1416        xfs_freesb(mp);
1417 out_destroy_counters:
1418        xfs_icsb_destroy_counters(mp);
1419out_destroy_workqueues:
1420        xfs_destroy_mount_workqueues(mp);
1421 out_close_devices:
1422        xfs_close_devices(mp);
1423 out_free_fsname:
1424        xfs_free_fsname(mp);
1425        kfree(mp);
1426 out:
1427        return -error;
1428
1429 out_unmount:
1430        xfs_filestream_unmount(mp);
1431        xfs_unmountfs(mp);
1432        xfs_syncd_stop(mp);
1433        goto out_free_sb;
1434}
1435
1436STATIC struct dentry *
1437xfs_fs_mount(
1438        struct file_system_type *fs_type,
1439        int                     flags,
1440        const char              *dev_name,
1441        void                    *data)
1442{
1443        return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1444}
1445
1446static int
1447xfs_fs_nr_cached_objects(
1448        struct super_block      *sb)
1449{
1450        return xfs_reclaim_inodes_count(XFS_M(sb));
1451}
1452
1453static void
1454xfs_fs_free_cached_objects(
1455        struct super_block      *sb,
1456        int                     nr_to_scan)
1457{
1458        xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
1459}
1460
1461static const struct super_operations xfs_super_operations = {
1462        .alloc_inode            = xfs_fs_alloc_inode,
1463        .destroy_inode          = xfs_fs_destroy_inode,
1464        .evict_inode            = xfs_fs_evict_inode,
1465        .drop_inode             = xfs_fs_drop_inode,
1466        .put_super              = xfs_fs_put_super,
1467        .sync_fs                = xfs_fs_sync_fs,
1468        .freeze_fs              = xfs_fs_freeze,
1469        .unfreeze_fs            = xfs_fs_unfreeze,
1470        .statfs                 = xfs_fs_statfs,
1471        .remount_fs             = xfs_fs_remount,
1472        .show_options           = xfs_fs_show_options,
1473        .nr_cached_objects      = xfs_fs_nr_cached_objects,
1474        .free_cached_objects    = xfs_fs_free_cached_objects,
1475};
1476
1477static struct file_system_type xfs_fs_type = {
1478        .owner                  = THIS_MODULE,
1479        .name                   = "xfs",
1480        .mount                  = xfs_fs_mount,
1481        .kill_sb                = kill_block_super,
1482        .fs_flags               = FS_REQUIRES_DEV,
1483};
1484
1485STATIC int __init
1486xfs_init_zones(void)
1487{
1488
1489        xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
1490        if (!xfs_ioend_zone)
1491                goto out;
1492
1493        xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
1494                                                  xfs_ioend_zone);
1495        if (!xfs_ioend_pool)
1496                goto out_destroy_ioend_zone;
1497
1498        xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1499                                                "xfs_log_ticket");
1500        if (!xfs_log_ticket_zone)
1501                goto out_destroy_ioend_pool;
1502
1503        xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
1504                                                "xfs_bmap_free_item");
1505        if (!xfs_bmap_free_item_zone)
1506                goto out_destroy_log_ticket_zone;
1507
1508        xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1509                                                "xfs_btree_cur");
1510        if (!xfs_btree_cur_zone)
1511                goto out_destroy_bmap_free_item_zone;
1512
1513        xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1514                                                "xfs_da_state");
1515        if (!xfs_da_state_zone)
1516                goto out_destroy_btree_cur_zone;
1517
1518        xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1519        if (!xfs_ifork_zone)
1520                goto out_destroy_da_state_zone;
1521
1522        xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1523        if (!xfs_trans_zone)
1524                goto out_destroy_ifork_zone;
1525
1526        xfs_log_item_desc_zone =
1527                kmem_zone_init(sizeof(struct xfs_log_item_desc),
1528                               "xfs_log_item_desc");
1529        if (!xfs_log_item_desc_zone)
1530                goto out_destroy_trans_zone;
1531
1532        /*
1533         * The size of the zone allocated buf log item is the maximum
1534         * size possible under XFS.  This wastes a little bit of memory,
1535         * but it is much faster.
1536         */
1537        xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1538                                           "xfs_buf_item");
1539        if (!xfs_buf_item_zone)
1540                goto out_destroy_log_item_desc_zone;
1541
1542        xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1543                        ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1544                                 sizeof(xfs_extent_t))), "xfs_efd_item");
1545        if (!xfs_efd_zone)
1546                goto out_destroy_buf_item_zone;
1547
1548        xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1549                        ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1550                                sizeof(xfs_extent_t))), "xfs_efi_item");
1551        if (!xfs_efi_zone)
1552                goto out_destroy_efd_zone;
1553
1554        xfs_inode_zone =
1555                kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1556                        KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
1557                        xfs_fs_inode_init_once);
1558        if (!xfs_inode_zone)
1559                goto out_destroy_efi_zone;
1560
1561        xfs_ili_zone =
1562                kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1563                                        KM_ZONE_SPREAD, NULL);
1564        if (!xfs_ili_zone)
1565                goto out_destroy_inode_zone;
1566
1567        return 0;
1568
1569 out_destroy_inode_zone:
1570        kmem_zone_destroy(xfs_inode_zone);
1571 out_destroy_efi_zone:
1572        kmem_zone_destroy(xfs_efi_zone);
1573 out_destroy_efd_zone:
1574        kmem_zone_destroy(xfs_efd_zone);
1575 out_destroy_buf_item_zone:
1576        kmem_zone_destroy(xfs_buf_item_zone);
1577 out_destroy_log_item_desc_zone:
1578        kmem_zone_destroy(xfs_log_item_desc_zone);
1579 out_destroy_trans_zone:
1580        kmem_zone_destroy(xfs_trans_zone);
1581 out_destroy_ifork_zone:
1582        kmem_zone_destroy(xfs_ifork_zone);
1583 out_destroy_da_state_zone:
1584        kmem_zone_destroy(xfs_da_state_zone);
1585 out_destroy_btree_cur_zone:
1586        kmem_zone_destroy(xfs_btree_cur_zone);
1587 out_destroy_bmap_free_item_zone:
1588        kmem_zone_destroy(xfs_bmap_free_item_zone);
1589 out_destroy_log_ticket_zone:
1590        kmem_zone_destroy(xfs_log_ticket_zone);
1591 out_destroy_ioend_pool:
1592        mempool_destroy(xfs_ioend_pool);
1593 out_destroy_ioend_zone:
1594        kmem_zone_destroy(xfs_ioend_zone);
1595 out:
1596        return -ENOMEM;
1597}
1598
1599STATIC void
1600xfs_destroy_zones(void)
1601{
1602        /*
1603         * Make sure all delayed rcu free are flushed before we
1604         * destroy caches.
1605         */
1606        rcu_barrier();
1607        kmem_zone_destroy(xfs_ili_zone);
1608        kmem_zone_destroy(xfs_inode_zone);
1609        kmem_zone_destroy(xfs_efi_zone);
1610        kmem_zone_destroy(xfs_efd_zone);
1611        kmem_zone_destroy(xfs_buf_item_zone);
1612        kmem_zone_destroy(xfs_log_item_desc_zone);
1613        kmem_zone_destroy(xfs_trans_zone);
1614        kmem_zone_destroy(xfs_ifork_zone);
1615        kmem_zone_destroy(xfs_da_state_zone);
1616        kmem_zone_destroy(xfs_btree_cur_zone);
1617        kmem_zone_destroy(xfs_bmap_free_item_zone);
1618        kmem_zone_destroy(xfs_log_ticket_zone);
1619        mempool_destroy(xfs_ioend_pool);
1620        kmem_zone_destroy(xfs_ioend_zone);
1621
1622}
1623
1624STATIC int __init
1625xfs_init_workqueues(void)
1626{
1627        /*
1628         * We never want to the same work item to run twice, reclaiming inodes
1629         * or idling the log is not going to get any faster by multiple CPUs
1630         * competing for ressources.  Use the default large max_active value
1631         * so that even lots of filesystems can perform these task in parallel.
1632         */
1633        xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0);
1634        if (!xfs_syncd_wq)
1635                return -ENOMEM;
1636
1637        /*
1638         * The allocation workqueue can be used in memory reclaim situations
1639         * (writepage path), and parallelism is only limited by the number of
1640         * AGs in all the filesystems mounted. Hence use the default large
1641         * max_active value for this workqueue.
1642         */
1643        xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
1644        if (!xfs_alloc_wq)
1645                goto out_destroy_syncd;
1646
1647        return 0;
1648
1649out_destroy_syncd:
1650        destroy_workqueue(xfs_syncd_wq);
1651        return -ENOMEM;
1652}
1653
1654STATIC void
1655xfs_destroy_workqueues(void)
1656{
1657        destroy_workqueue(xfs_alloc_wq);
1658        destroy_workqueue(xfs_syncd_wq);
1659}
1660
1661STATIC int __init
1662init_xfs_fs(void)
1663{
1664        int                     error;
1665
1666        printk(KERN_INFO XFS_VERSION_STRING " with "
1667                         XFS_BUILD_OPTIONS " enabled\n");
1668
1669        xfs_dir_startup();
1670
1671        error = xfs_init_zones();
1672        if (error)
1673                goto out;
1674
1675        error = xfs_init_workqueues();
1676        if (error)
1677                goto out_destroy_zones;
1678
1679        error = xfs_mru_cache_init();
1680        if (error)
1681                goto out_destroy_wq;
1682
1683        error = xfs_filestream_init();
1684        if (error)
1685                goto out_mru_cache_uninit;
1686
1687        error = xfs_buf_init();
1688        if (error)
1689                goto out_filestream_uninit;
1690
1691        error = xfs_init_procfs();
1692        if (error)
1693                goto out_buf_terminate;
1694
1695        error = xfs_sysctl_register();
1696        if (error)
1697                goto out_cleanup_procfs;
1698
1699        error = xfs_qm_init();
1700        if (error)
1701                goto out_sysctl_unregister;
1702
1703        error = register_filesystem(&xfs_fs_type);
1704        if (error)
1705                goto out_qm_exit;
1706        return 0;
1707
1708 out_qm_exit:
1709        xfs_qm_exit();
1710 out_sysctl_unregister:
1711        xfs_sysctl_unregister();
1712 out_cleanup_procfs:
1713        xfs_cleanup_procfs();
1714 out_buf_terminate:
1715        xfs_buf_terminate();
1716 out_filestream_uninit:
1717        xfs_filestream_uninit();
1718 out_mru_cache_uninit:
1719        xfs_mru_cache_uninit();
1720 out_destroy_wq:
1721        xfs_destroy_workqueues();
1722 out_destroy_zones:
1723        xfs_destroy_zones();
1724 out:
1725        return error;
1726}
1727
1728STATIC void __exit
1729exit_xfs_fs(void)
1730{
1731        xfs_qm_exit();
1732        unregister_filesystem(&xfs_fs_type);
1733        xfs_sysctl_unregister();
1734        xfs_cleanup_procfs();
1735        xfs_buf_terminate();
1736        xfs_filestream_uninit();
1737        xfs_mru_cache_uninit();
1738        xfs_destroy_workqueues();
1739        xfs_destroy_zones();
1740}
1741
1742module_init(init_xfs_fs);
1743module_exit(exit_xfs_fs);
1744
1745MODULE_AUTHOR("Silicon Graphics, Inc.");
1746MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1747MODULE_LICENSE("GPL");
1748
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