fs/xfs/xfs_mount.h

   1 /*
   2  * Copyright (c) 2000-2005 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 #ifndef __XFS_MOUNT_H__
  19 #define __XFS_MOUNT_H__
  20
  21 typedef struct xfs_trans_reservations {
  22         uint    tr_write;       /* extent alloc trans */
  23         uint    tr_itruncate;   /* truncate trans */
  24         uint    tr_rename;      /* rename trans */
  25         uint    tr_link;        /* link trans */
  26         uint    tr_remove;      /* unlink trans */
  27         uint    tr_symlink;     /* symlink trans */
  28         uint    tr_create;      /* create trans */
  29         uint    tr_mkdir;       /* mkdir trans */
  30         uint    tr_ifree;       /* inode free trans */
  31         uint    tr_ichange;     /* inode update trans */
  32         uint    tr_growdata;    /* fs data section grow trans */
  33         uint    tr_swrite;      /* sync write inode trans */
  34         uint    tr_addafork;    /* cvt inode to attributed trans */
  35         uint    tr_writeid;     /* write setuid/setgid file */
  36         uint    tr_attrinval;   /* attr fork buffer invalidation */
  37         uint    tr_attrset;     /* set/create an attribute */
  38         uint    tr_attrrm;      /* remove an attribute */
  39         uint    tr_clearagi;    /* clear bad agi unlinked ino bucket */
  40         uint    tr_growrtalloc; /* grow realtime allocations */
  41         uint    tr_growrtzero;  /* grow realtime zeroing */
  42         uint    tr_growrtfree;  /* grow realtime freeing */
  43 } xfs_trans_reservations_t;
  44
  45 #ifndef __KERNEL__
  46
  47 #define xfs_daddr_to_agno(mp,d) \
  48         ((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
  49 #define xfs_daddr_to_agbno(mp,d) \
  50         ((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))
  51
  52 #else /* __KERNEL__ */
  53
  54 #include "xfs_sync.h"
  55
  56 struct cred;
  57 struct log;
  58 struct xfs_mount_args;
  59 struct xfs_inode;
  60 struct xfs_bmbt_irec;
  61 struct xfs_bmap_free;
  62 struct xfs_extdelta;
  63 struct xfs_swapext;
  64 struct xfs_mru_cache;
  65 struct xfs_nameops;
  66 struct xfs_ail;
  67 struct xfs_quotainfo;
  68
  69
  70 /*
  71  * Prototypes and functions for the Data Migration subsystem.
  72  */
  73
  74 typedef int     (*xfs_send_data_t)(int, struct xfs_inode *,
  75                         xfs_off_t, size_t, int, int *);
  76 typedef int     (*xfs_send_mmap_t)(struct vm_area_struct *, uint);
  77 typedef int     (*xfs_send_destroy_t)(struct xfs_inode *, dm_right_t);
  78 typedef int     (*xfs_send_namesp_t)(dm_eventtype_t, struct xfs_mount *,
  79                         struct xfs_inode *, dm_right_t,
  80                         struct xfs_inode *, dm_right_t,
  81                         const char *, const char *, mode_t, int, int);
  82 typedef int     (*xfs_send_mount_t)(struct xfs_mount *, dm_right_t,
  83                         char *, char *);
  84 typedef void    (*xfs_send_unmount_t)(struct xfs_mount *, struct xfs_inode *,
  85                         dm_right_t, mode_t, int, int);
  86
  87 typedef struct xfs_dmops {
  88         xfs_send_data_t         xfs_send_data;
  89         xfs_send_mmap_t         xfs_send_mmap;
  90         xfs_send_destroy_t      xfs_send_destroy;
  91         xfs_send_namesp_t       xfs_send_namesp;
  92         xfs_send_mount_t        xfs_send_mount;
  93         xfs_send_unmount_t      xfs_send_unmount;
  94 } xfs_dmops_t;
  95
  96 #define XFS_SEND_DATA(mp, ev,ip,off,len,fl,lock) \
  97         (*(mp)->m_dm_ops->xfs_send_data)(ev,ip,off,len,fl,lock)
  98 #define XFS_SEND_MMAP(mp, vma,fl) \
  99         (*(mp)->m_dm_ops->xfs_send_mmap)(vma,fl)
 100 #define XFS_SEND_DESTROY(mp, ip,right) \
 101         (*(mp)->m_dm_ops->xfs_send_destroy)(ip,right)
 102 #define XFS_SEND_NAMESP(mp, ev,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 103         (*(mp)->m_dm_ops->xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 104 #define XFS_SEND_PREUNMOUNT(mp,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 105         (*(mp)->m_dm_ops->xfs_send_namesp)(DM_EVENT_PREUNMOUNT,mp,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 106 #define XFS_SEND_MOUNT(mp,right,path,name) \
 107         (*(mp)->m_dm_ops->xfs_send_mount)(mp,right,path,name)
 108 #define XFS_SEND_UNMOUNT(mp, ip,right,mode,rval,fl) \
 109         (*(mp)->m_dm_ops->xfs_send_unmount)(mp,ip,right,mode,rval,fl)
 110
 111
 112 #ifdef HAVE_PERCPU_SB
 113
 114 /*
 115  * Valid per-cpu incore superblock counters. Note that if you add new counters,
 116  * you may need to define new counter disabled bit field descriptors as there
 117  * are more possible fields in the superblock that can fit in a bitfield on a
 118  * 32 bit platform. The XFS_SBS_* values for the current current counters just
 119  * fit.
 120  */
 121 typedef struct xfs_icsb_cnts {
 122         uint64_t        icsb_fdblocks;
 123         uint64_t        icsb_ifree;
 124         uint64_t        icsb_icount;
 125         unsigned long   icsb_flags;
 126 } xfs_icsb_cnts_t;
 127
 128 #define XFS_ICSB_FLAG_LOCK      (1 << 0)        /* counter lock bit */
 129
 130 #define XFS_ICSB_LAZY_COUNT     (1 << 1)        /* accuracy not needed */
 131
 132 extern int      xfs_icsb_init_counters(struct xfs_mount *);
 133 extern void     xfs_icsb_reinit_counters(struct xfs_mount *);
 134 extern void     xfs_icsb_destroy_counters(struct xfs_mount *);
 135 extern void     xfs_icsb_sync_counters(struct xfs_mount *, int);
 136 extern void     xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
 137
 138 #else
 139 #define xfs_icsb_init_counters(mp)              (0)
 140 #define xfs_icsb_destroy_counters(mp)           do { } while (0)
 141 #define xfs_icsb_reinit_counters(mp)            do { } while (0)
 142 #define xfs_icsb_sync_counters(mp, flags)       do { } while (0)
 143 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
 144 #endif
 145
 146 typedef struct xfs_mount {
 147         struct super_block      *m_super;
 148         xfs_tid_t               m_tid;          /* next unused tid for fs */
 149         struct xfs_ail          *m_ail;         /* fs active log item list */
 150         xfs_sb_t                m_sb;           /* copy of fs superblock */
 151         spinlock_t              m_sb_lock;      /* sb counter lock */
 152         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
 153         char                    *m_fsname;      /* filesystem name */
 154         int                     m_fsname_len;   /* strlen of fs name */
 155         char                    *m_rtname;      /* realtime device name */
 156         char                    *m_logname;     /* external log device name */
 157         int                     m_bsize;        /* fs logical block size */
 158         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
 159         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
 160         spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
 161         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
 162         uint                    m_readio_log;   /* min read size log bytes */
 163         uint                    m_readio_blocks; /* min read size blocks */
 164         uint                    m_writeio_log;  /* min write size log bytes */
 165         uint                    m_writeio_blocks; /* min write size blocks */
 166         struct log              *m_log;         /* log specific stuff */
 167         int                     m_logbufs;      /* number of log buffers */
 168         int                     m_logbsize;     /* size of each log buffer */
 169         uint                    m_rsumlevels;   /* rt summary levels */
 170         uint                    m_rsumsize;     /* size of rt summary, bytes */
 171         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 172         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 173         struct xfs_inode        *m_rootip;      /* pointer to root directory */
 174         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 175         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 176         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 177         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 178         __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
 179         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
 180         __uint8_t               m_agno_log;     /* log #ag's */
 181         __uint8_t               m_agino_log;    /* #bits for agino in inum */
 182         __uint16_t              m_inode_cluster_size;/* min inode buf size */
 183         uint                    m_blockmask;    /* sb_blocksize-1 */
 184         uint                    m_blockwsize;   /* sb_blocksize in words */
 185         uint                    m_blockwmask;   /* blockwsize-1 */
 186         uint                    m_alloc_mxr[2]; /* max alloc btree records */
 187         uint                    m_alloc_mnr[2]; /* min alloc btree records */
 188         uint                    m_bmap_dmxr[2]; /* max bmap btree records */
 189         uint                    m_bmap_dmnr[2]; /* min bmap btree records */
 190         uint                    m_inobt_mxr[2]; /* max inobt btree records */
 191         uint                    m_inobt_mnr[2]; /* min inobt btree records */
 192         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 193         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 194         uint                    m_in_maxlevels; /* max inobt btree levels. */
 195         struct xfs_perag        *m_perag;       /* per-ag accounting info */
 196         struct rw_semaphore     m_peraglock;    /* lock for m_perag (pointer) */
 197         struct mutex            m_growlock;     /* growfs mutex */
 198         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 199         uint                    m_dmevmask;     /* DMI events for this FS */
 200         __uint64_t              m_flags;        /* global mount flags */
 201         uint                    m_dir_node_ents; /* #entries in a dir danode */
 202         uint                    m_attr_node_ents; /* #entries in attr danode */
 203         int                     m_ialloc_inos;  /* inodes in inode allocation */
 204         int                     m_ialloc_blks;  /* blocks in inode allocation */
 205         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 206         uint                    m_qflags;       /* quota status flags */
 207         xfs_trans_reservations_t m_reservations;/* precomputed res values */
 208         __uint64_t              m_maxicount;    /* maximum inode count */
 209         __uint64_t              m_maxioffset;   /* maximum inode offset */
 210         __uint64_t              m_resblks;      /* total reserved blocks */
 211         __uint64_t              m_resblks_avail;/* available reserved blocks */
 212         int                     m_dalign;       /* stripe unit */
 213         int                     m_swidth;       /* stripe width */
 214         int                     m_sinoalign;    /* stripe unit inode alignment */
 215         int                     m_attr_magicpct;/* 37% of the blocksize */
 216         int                     m_dir_magicpct; /* 37% of the dir blocksize */
 217         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 218         const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
 219         int                     m_dirblksize;   /* directory block sz--bytes */
 220         int                     m_dirblkfsbs;   /* directory block sz--fsbs */
 221         xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */
 222         xfs_dablk_t             m_dirleafblk;   /* blockno of dir non-data v2 */
 223         xfs_dablk_t             m_dirfreeblk;   /* blockno of dirfreeindex v2 */
 224         uint                    m_chsize;       /* size of next field */
 225         struct xfs_chash        *m_chash;       /* fs private inode per-cluster
 226                                                  * hash table */
 227         struct xfs_dmops        *m_dm_ops;      /* vector of DMI ops */
 228         struct xfs_qmops        *m_qm_ops;      /* vector of XQM ops */
 229         atomic_t                m_active_trans; /* number trans frozen */
 230 #ifdef HAVE_PERCPU_SB
 231         xfs_icsb_cnts_t         *m_sb_cnts;     /* per-cpu superblock counters */
 232         unsigned long           m_icsb_counters; /* disabled per-cpu counters */
 233         struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
 234         struct mutex            m_icsb_mutex;   /* balancer sync lock */
 235 #endif
 236         struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 237         struct task_struct      *m_sync_task;   /* generalised sync thread */
 238         xfs_sync_work_t         m_sync_work;    /* work item for VFS_SYNC */
 239         struct list_head        m_sync_list;    /* sync thread work item list */
 240         spinlock_t              m_sync_lock;    /* work item list lock */
 241         int                     m_sync_seq;     /* sync thread generation no. */
 242         wait_queue_head_t       m_wait_single_sync_task;
 243         __int64_t               m_update_flags; /* sb flags we need to update
 244                                                    on the next remount,rw */
 245 } xfs_mount_t;
 246
 247 /*
 248  * Flags for m_flags.
 249  */
 250 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 251                                                    must be synchronous except
 252                                                    for space allocations */
 253 #define XFS_MOUNT_DMAPI         (1ULL << 2)     /* dmapi is enabled */
 254 #define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 255 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 256                                                    operations, typically for
 257                                                    disk errors in metadata */
 258 #define XFS_MOUNT_RETERR        (1ULL << 6)     /* return alignment errors to
 259                                                    user */
 260 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 261                                                    allocations */
 262 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 263 #define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 264 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 265 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 266 #define XFS_MOUNT_OSYNCISOSYNC  (1ULL << 13)    /* o_sync is REALLY o_sync */
 267                                                 /* osyncisdsync is now default*/
 268 #define XFS_MOUNT_32BITINODES   (1ULL << 14)    /* do not create inodes above
 269                                                  * 32 bits in size */
 270 #define XFS_MOUNT_SMALL_INUMS   (1ULL << 15)    /* users wants 32bit inodes */
 271 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 272 #define XFS_MOUNT_BARRIER       (1ULL << 17)
 273 #define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 274 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 275                                                  * allocation */
 276 #define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 277 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 278 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 279                                                  * I/O size in stat() */
 280 #define XFS_MOUNT_NO_PERCPU_SB  (1ULL << 23)    /* don't use per-cpu superblock
 281                                                    counters */
 282 #define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 283                                                    allocator */
 284 #define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 285
 286
 287 /*
 288  * Default minimum read and write sizes.
 289  */
 290 #define XFS_READIO_LOG_LARGE    16
 291 #define XFS_WRITEIO_LOG_LARGE   16
 292
 293 /*
 294  * Max and min values for mount-option defined I/O
 295  * preallocation sizes.
 296  */
 297 #define XFS_MAX_IO_LOG          30      /* 1G */
 298 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 299
 300 /*
 301  * Synchronous read and write sizes.  This should be
 302  * better for NFSv2 wsync filesystems.
 303  */
 304 #define XFS_WSYNC_READIO_LOG    15      /* 32k */
 305 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16k */
 306
 307 /*
 308  * Allow large block sizes to be reported to userspace programs if the
 309  * "largeio" mount option is used.
 310  *
 311  * If compatibility mode is specified, simply return the basic unit of caching
 312  * so that we don't get inefficient read/modify/write I/O from user apps.
 313  * Otherwise....
 314  *
 315  * If the underlying volume is a stripe, then return the stripe width in bytes
 316  * as the recommended I/O size. It is not a stripe and we've set a default
 317  * buffered I/O size, return that, otherwise return the compat default.
 318  */
 319 static inline unsigned long
 320 xfs_preferred_iosize(xfs_mount_t *mp)
 321 {
 322         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 323                 return PAGE_CACHE_SIZE;
 324         return (mp->m_swidth ?
 325                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 326                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 327                         (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 328                         PAGE_CACHE_SIZE));
 329 }
 330
 331 #define XFS_MAXIOFFSET(mp)      ((mp)->m_maxioffset)
 332
 333 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 334                                 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 335 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 336 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 337                 int lnnum);
 338 #define xfs_force_shutdown(m,f) \
 339         xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 340
 341 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 342 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 343 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 344 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 345 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 346 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 347
 348 #define xfs_test_for_freeze(mp)         ((mp)->m_super->s_frozen)
 349 #define xfs_wait_for_freeze(mp,l)       vfs_check_frozen((mp)->m_super, (l))
 350
 351 /*
 352  * Flags for xfs_mountfs
 353  */
 354 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 355
 356 static inline xfs_agnumber_t
 357 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 358 {
 359         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 360         do_div(ld, mp->m_sb.sb_agblocks);
 361         return (xfs_agnumber_t) ld;
 362 }
 363
 364 static inline xfs_agblock_t
 365 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 366 {
 367         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 368         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 369 }
 370
 371 /*
 372  * perag get/put wrappers for eventual ref counting
 373  */
 374 static inline xfs_perag_t *
 375 xfs_get_perag(struct xfs_mount *mp, xfs_ino_t ino)
 376 {
 377         return &mp->m_perag[XFS_INO_TO_AGNO(mp, ino)];
 378 }
 379
 380 static inline void
 381 xfs_put_perag(struct xfs_mount *mp, xfs_perag_t *pag)
 382 {
 383         /* nothing to see here, move along */
 384 }
 385
 386 /*
 387  * Per-cpu superblock locking functions
 388  */
 389 #ifdef HAVE_PERCPU_SB
 390 STATIC_INLINE void
 391 xfs_icsb_lock(xfs_mount_t *mp)
 392 {
 393         mutex_lock(&mp->m_icsb_mutex);
 394 }
 395
 396 STATIC_INLINE void
 397 xfs_icsb_unlock(xfs_mount_t *mp)
 398 {
 399         mutex_unlock(&mp->m_icsb_mutex);
 400 }
 401 #else
 402 #define xfs_icsb_lock(mp)
 403 #define xfs_icsb_unlock(mp)
 404 #endif
 405
 406 /*
 407  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
 408  * xfs_growfs can specify a few fields which are more than int limit
 409  */
 410 typedef struct xfs_mod_sb {
 411         xfs_sb_field_t  msb_field;      /* Field to modify, see below */
 412         int64_t         msb_delta;      /* Change to make to specified field */
 413 } xfs_mod_sb_t;
 414
 415 extern int      xfs_log_sbcount(xfs_mount_t *, uint);
 416 extern int      xfs_mountfs(xfs_mount_t *mp);
 417 extern void     xfs_mountfs_check_barriers(xfs_mount_t *mp);
 418
 419 extern void     xfs_unmountfs(xfs_mount_t *);
 420 extern int      xfs_unmountfs_writesb(xfs_mount_t *);
 421 extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
 422 extern int      xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t,
 423                         int64_t, int);
 424 extern int      xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 425                         uint, int);
 426 extern int      xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 427 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 428 extern int      xfs_readsb(xfs_mount_t *, int);
 429 extern void     xfs_freesb(xfs_mount_t *);
 430 extern int      xfs_fs_writable(xfs_mount_t *);
 431 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 432
 433 extern int      xfs_dmops_get(struct xfs_mount *);
 434 extern void     xfs_dmops_put(struct xfs_mount *);
 435
 436 extern struct xfs_dmops xfs_dmcore_xfs;
 437
 438 #endif  /* __KERNEL__ */
 439
 440 extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
 441 extern xfs_agnumber_t   xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t);
 442 extern void     xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
 443 extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 444
 445 #endif  /* __XFS_MOUNT_H__ */