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 unsigned char *, const unsigned char *,
  82                         mode_t, int, int);
  83 typedef int     (*xfs_send_mount_t)(struct xfs_mount *, dm_right_t,
  84                         char *, char *);
  85 typedef void    (*xfs_send_unmount_t)(struct xfs_mount *, struct xfs_inode *,
  86                         dm_right_t, mode_t, int, int);
  87
  88 typedef struct xfs_dmops {
  89         xfs_send_data_t         xfs_send_data;
  90         xfs_send_mmap_t         xfs_send_mmap;
  91         xfs_send_destroy_t      xfs_send_destroy;
  92         xfs_send_namesp_t       xfs_send_namesp;
  93         xfs_send_mount_t        xfs_send_mount;
  94         xfs_send_unmount_t      xfs_send_unmount;
  95 } xfs_dmops_t;
  96
  97 #define XFS_DMAPI_UNMOUNT_FLAGS(mp) \
  98         (((mp)->m_dmevmask & (1 << DM_EVENT_UNMOUNT)) ? 0 : DM_FLAGS_UNWANTED)
  99
 100 #define XFS_SEND_DATA(mp, ev,ip,off,len,fl,lock) \
 101         (*(mp)->m_dm_ops->xfs_send_data)(ev,ip,off,len,fl,lock)
 102 #define XFS_SEND_MMAP(mp, vma,fl) \
 103         (*(mp)->m_dm_ops->xfs_send_mmap)(vma,fl)
 104 #define XFS_SEND_DESTROY(mp, ip,right) \
 105         (*(mp)->m_dm_ops->xfs_send_destroy)(ip,right)
 106 #define XFS_SEND_NAMESP(mp, ev,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 107         (*(mp)->m_dm_ops->xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 108 #define XFS_SEND_MOUNT(mp,right,path,name) \
 109         (*(mp)->m_dm_ops->xfs_send_mount)(mp,right,path,name)
 110 #define XFS_SEND_PREUNMOUNT(mp) \
 111 do { \
 112         if (mp->m_flags & XFS_MOUNT_DMAPI) { \
 113                 (*(mp)->m_dm_ops->xfs_send_namesp)(DM_EVENT_PREUNMOUNT, mp, \
 114                         (mp)->m_rootip, DM_RIGHT_NULL, \
 115                         (mp)->m_rootip, DM_RIGHT_NULL, \
 116                         NULL, NULL, 0, 0, XFS_DMAPI_UNMOUNT_FLAGS(mp)); \
 117         } \
 118 } while (0)
 119 #define XFS_SEND_UNMOUNT(mp) \
 120 do { \
 121         if (mp->m_flags & XFS_MOUNT_DMAPI) { \
 122                 (*(mp)->m_dm_ops->xfs_send_unmount)(mp, (mp)->m_rootip, \
 123                         DM_RIGHT_NULL, 0, 0, XFS_DMAPI_UNMOUNT_FLAGS(mp)); \
 124         } \
 125 } while (0)
 126
 127
 128 #ifdef HAVE_PERCPU_SB
 129
 130 /*
 131  * Valid per-cpu incore superblock counters. Note that if you add new counters,
 132  * you may need to define new counter disabled bit field descriptors as there
 133  * are more possible fields in the superblock that can fit in a bitfield on a
 134  * 32 bit platform. The XFS_SBS_* values for the current current counters just
 135  * fit.
 136  */
 137 typedef struct xfs_icsb_cnts {
 138         uint64_t        icsb_fdblocks;
 139         uint64_t        icsb_ifree;
 140         uint64_t        icsb_icount;
 141         unsigned long   icsb_flags;
 142 } xfs_icsb_cnts_t;
 143
 144 #define XFS_ICSB_FLAG_LOCK      (1 << 0)        /* counter lock bit */
 145
 146 #define XFS_ICSB_LAZY_COUNT     (1 << 1)        /* accuracy not needed */
 147
 148 extern int      xfs_icsb_init_counters(struct xfs_mount *);
 149 extern void     xfs_icsb_reinit_counters(struct xfs_mount *);
 150 extern void     xfs_icsb_destroy_counters(struct xfs_mount *);
 151 extern void     xfs_icsb_sync_counters(struct xfs_mount *, int);
 152 extern void     xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
 153
 154 #else
 155 #define xfs_icsb_init_counters(mp)              (0)
 156 #define xfs_icsb_destroy_counters(mp)           do { } while (0)
 157 #define xfs_icsb_reinit_counters(mp)            do { } while (0)
 158 #define xfs_icsb_sync_counters(mp, flags)       do { } while (0)
 159 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
 160 #endif
 161
 162 typedef struct xfs_mount {
 163         struct super_block      *m_super;
 164         xfs_tid_t               m_tid;          /* next unused tid for fs */
 165         struct xfs_ail          *m_ail;         /* fs active log item list */
 166         xfs_sb_t                m_sb;           /* copy of fs superblock */
 167         spinlock_t              m_sb_lock;      /* sb counter lock */
 168         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
 169         char                    *m_fsname;      /* filesystem name */
 170         int                     m_fsname_len;   /* strlen of fs name */
 171         char                    *m_rtname;      /* realtime device name */
 172         char                    *m_logname;     /* external log device name */
 173         int                     m_bsize;        /* fs logical block size */
 174         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
 175         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
 176         spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
 177         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
 178         uint                    m_readio_log;   /* min read size log bytes */
 179         uint                    m_readio_blocks; /* min read size blocks */
 180         uint                    m_writeio_log;  /* min write size log bytes */
 181         uint                    m_writeio_blocks; /* min write size blocks */
 182         struct log              *m_log;         /* log specific stuff */
 183         int                     m_logbufs;      /* number of log buffers */
 184         int                     m_logbsize;     /* size of each log buffer */
 185         uint                    m_rsumlevels;   /* rt summary levels */
 186         uint                    m_rsumsize;     /* size of rt summary, bytes */
 187         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 188         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 189         struct xfs_inode        *m_rootip;      /* pointer to root directory */
 190         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 191         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 192         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 193         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 194         __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
 195         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
 196         __uint8_t               m_agno_log;     /* log #ag's */
 197         __uint8_t               m_agino_log;    /* #bits for agino in inum */
 198         __uint16_t              m_inode_cluster_size;/* min inode buf size */
 199         uint                    m_blockmask;    /* sb_blocksize-1 */
 200         uint                    m_blockwsize;   /* sb_blocksize in words */
 201         uint                    m_blockwmask;   /* blockwsize-1 */
 202         uint                    m_alloc_mxr[2]; /* max alloc btree records */
 203         uint                    m_alloc_mnr[2]; /* min alloc btree records */
 204         uint                    m_bmap_dmxr[2]; /* max bmap btree records */
 205         uint                    m_bmap_dmnr[2]; /* min bmap btree records */
 206         uint                    m_inobt_mxr[2]; /* max inobt btree records */
 207         uint                    m_inobt_mnr[2]; /* min inobt btree records */
 208         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 209         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 210         uint                    m_in_maxlevels; /* max inobt btree levels. */
 211         struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
 212         spinlock_t              m_perag_lock;   /* lock for m_perag_tree */
 213         struct mutex            m_growlock;     /* growfs mutex */
 214         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 215         uint                    m_dmevmask;     /* DMI events for this FS */
 216         __uint64_t              m_flags;        /* global mount flags */
 217         uint                    m_dir_node_ents; /* #entries in a dir danode */
 218         uint                    m_attr_node_ents; /* #entries in attr danode */
 219         int                     m_ialloc_inos;  /* inodes in inode allocation */
 220         int                     m_ialloc_blks;  /* blocks in inode allocation */
 221         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 222         uint                    m_qflags;       /* quota status flags */
 223         xfs_trans_reservations_t m_reservations;/* precomputed res values */
 224         __uint64_t              m_maxicount;    /* maximum inode count */
 225         __uint64_t              m_maxioffset;   /* maximum inode offset */
 226         __uint64_t              m_resblks;      /* total reserved blocks */
 227         __uint64_t              m_resblks_avail;/* available reserved blocks */
 228         __uint64_t              m_resblks_save; /* reserved blks @ remount,ro */
 229         int                     m_dalign;       /* stripe unit */
 230         int                     m_swidth;       /* stripe width */
 231         int                     m_sinoalign;    /* stripe unit inode alignment */
 232         int                     m_attr_magicpct;/* 37% of the blocksize */
 233         int                     m_dir_magicpct; /* 37% of the dir blocksize */
 234         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 235         const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
 236         int                     m_dirblksize;   /* directory block sz--bytes */
 237         int                     m_dirblkfsbs;   /* directory block sz--fsbs */
 238         xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */
 239         xfs_dablk_t             m_dirleafblk;   /* blockno of dir non-data v2 */
 240         xfs_dablk_t             m_dirfreeblk;   /* blockno of dirfreeindex v2 */
 241         uint                    m_chsize;       /* size of next field */
 242         struct xfs_chash        *m_chash;       /* fs private inode per-cluster
 243                                                  * hash table */
 244         struct xfs_dmops        *m_dm_ops;      /* vector of DMI ops */
 245         struct xfs_qmops        *m_qm_ops;      /* vector of XQM ops */
 246         atomic_t                m_active_trans; /* number trans frozen */
 247 #ifdef HAVE_PERCPU_SB
 248         xfs_icsb_cnts_t __percpu *m_sb_cnts;    /* per-cpu superblock counters */
 249         unsigned long           m_icsb_counters; /* disabled per-cpu counters */
 250         struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
 251         struct mutex            m_icsb_mutex;   /* balancer sync lock */
 252 #endif
 253         struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 254         struct task_struct      *m_sync_task;   /* generalised sync thread */
 255         xfs_sync_work_t         m_sync_work;    /* work item for VFS_SYNC */
 256         struct list_head        m_sync_list;    /* sync thread work item list */
 257         spinlock_t              m_sync_lock;    /* work item list lock */
 258         int                     m_sync_seq;     /* sync thread generation no. */
 259         wait_queue_head_t       m_wait_single_sync_task;
 260         __int64_t               m_update_flags; /* sb flags we need to update
 261                                                    on the next remount,rw */
 262         struct list_head        m_mplist;       /* inode shrinker mount list */
 263 } xfs_mount_t;
 264
 265 /*
 266  * Flags for m_flags.
 267  */
 268 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 269                                                    must be synchronous except
 270                                                    for space allocations */
 271 #define XFS_MOUNT_DELAYLOG      (1ULL << 1)     /* delayed logging is enabled */
 272 #define XFS_MOUNT_DMAPI         (1ULL << 2)     /* dmapi is enabled */
 273 #define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 274 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 275                                                    operations, typically for
 276                                                    disk errors in metadata */
 277 #define XFS_MOUNT_RETERR        (1ULL << 6)     /* return alignment errors to
 278                                                    user */
 279 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 280                                                    allocations */
 281 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 282 #define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 283 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 284 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 285 #define XFS_MOUNT_OSYNCISOSYNC  (1ULL << 13)    /* o_sync is REALLY o_sync */
 286                                                 /* osyncisdsync is now default*/
 287 #define XFS_MOUNT_32BITINODES   (1ULL << 14)    /* do not create inodes above
 288                                                  * 32 bits in size */
 289 #define XFS_MOUNT_SMALL_INUMS   (1ULL << 15)    /* users wants 32bit inodes */
 290 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 291 #define XFS_MOUNT_BARRIER       (1ULL << 17)
 292 #define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 293 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 294                                                  * allocation */
 295 #define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 296 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 297 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 298                                                  * I/O size in stat() */
 299 #define XFS_MOUNT_NO_PERCPU_SB  (1ULL << 23)    /* don't use per-cpu superblock
 300                                                    counters */
 301 #define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 302                                                    allocator */
 303 #define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 304
 305
 306 /*
 307  * Default minimum read and write sizes.
 308  */
 309 #define XFS_READIO_LOG_LARGE    16
 310 #define XFS_WRITEIO_LOG_LARGE   16
 311
 312 /*
 313  * Max and min values for mount-option defined I/O
 314  * preallocation sizes.
 315  */
 316 #define XFS_MAX_IO_LOG          30      /* 1G */
 317 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 318
 319 /*
 320  * Synchronous read and write sizes.  This should be
 321  * better for NFSv2 wsync filesystems.
 322  */
 323 #define XFS_WSYNC_READIO_LOG    15      /* 32k */
 324 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16k */
 325
 326 /*
 327  * Allow large block sizes to be reported to userspace programs if the
 328  * "largeio" mount option is used.
 329  *
 330  * If compatibility mode is specified, simply return the basic unit of caching
 331  * so that we don't get inefficient read/modify/write I/O from user apps.
 332  * Otherwise....
 333  *
 334  * If the underlying volume is a stripe, then return the stripe width in bytes
 335  * as the recommended I/O size. It is not a stripe and we've set a default
 336  * buffered I/O size, return that, otherwise return the compat default.
 337  */
 338 static inline unsigned long
 339 xfs_preferred_iosize(xfs_mount_t *mp)
 340 {
 341         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 342                 return PAGE_CACHE_SIZE;
 343         return (mp->m_swidth ?
 344                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 345                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 346                         (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 347                         PAGE_CACHE_SIZE));
 348 }
 349
 350 #define XFS_MAXIOFFSET(mp)      ((mp)->m_maxioffset)
 351
 352 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 353                                 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 354 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 355 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 356                 int lnnum);
 357 #define xfs_force_shutdown(m,f) \
 358         xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 359
 360 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 361 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 362 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 363 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 364 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 365 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 366
 367 #define xfs_test_for_freeze(mp)         ((mp)->m_super->s_frozen)
 368 #define xfs_wait_for_freeze(mp,l)       vfs_check_frozen((mp)->m_super, (l))
 369
 370 /*
 371  * Flags for xfs_mountfs
 372  */
 373 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 374
 375 static inline xfs_agnumber_t
 376 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 377 {
 378         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 379         do_div(ld, mp->m_sb.sb_agblocks);
 380         return (xfs_agnumber_t) ld;
 381 }
 382
 383 static inline xfs_agblock_t
 384 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 385 {
 386         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 387         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 388 }
 389
 390 /*
 391  * perag get/put wrappers for ref counting
 392  */
 393 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
 394 void    xfs_perag_put(struct xfs_perag *pag);
 395
 396 /*
 397  * Per-cpu superblock locking functions
 398  */
 399 #ifdef HAVE_PERCPU_SB
 400 static inline void
 401 xfs_icsb_lock(xfs_mount_t *mp)
 402 {
 403         mutex_lock(&mp->m_icsb_mutex);
 404 }
 405
 406 static inline void
 407 xfs_icsb_unlock(xfs_mount_t *mp)
 408 {
 409         mutex_unlock(&mp->m_icsb_mutex);
 410 }
 411 #else
 412 #define xfs_icsb_lock(mp)
 413 #define xfs_icsb_unlock(mp)
 414 #endif
 415
 416 /*
 417  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
 418  * xfs_growfs can specify a few fields which are more than int limit
 419  */
 420 typedef struct xfs_mod_sb {
 421         xfs_sb_field_t  msb_field;      /* Field to modify, see below */
 422         int64_t         msb_delta;      /* Change to make to specified field */
 423 } xfs_mod_sb_t;
 424
 425 extern int      xfs_log_sbcount(xfs_mount_t *, uint);
 426 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
 427 extern int      xfs_mountfs(xfs_mount_t *mp);
 428
 429 extern void     xfs_unmountfs(xfs_mount_t *);
 430 extern int      xfs_unmountfs_writesb(xfs_mount_t *);
 431 extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
 432 extern int      xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 433                         uint, int);
 434 extern int      xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 435 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 436 extern int      xfs_readsb(xfs_mount_t *, int);
 437 extern void     xfs_freesb(xfs_mount_t *);
 438 extern int      xfs_fs_writable(xfs_mount_t *);
 439 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 440
 441 extern int      xfs_dev_is_read_only(struct xfs_mount *, char *);
 442
 443 extern int      xfs_dmops_get(struct xfs_mount *);
 444 extern void     xfs_dmops_put(struct xfs_mount *);
 445
 446 extern struct xfs_dmops xfs_dmcore_xfs;
 447
 448 #endif  /* __KERNEL__ */
 449
 450 extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
 451 extern int      xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
 452                                         xfs_agnumber_t *);
 453 extern void     xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
 454 extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 455
 456 #endif  /* __XFS_MOUNT_H__ */