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 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  * All Rights Reserved.
  */
 #ifndef __XFS_MOUNT_H__
 #define __XFS_MOUNT_H__
 
 struct xlog;
 struct xfs_inode;
 struct xfs_mru_cache;
 struct xfs_ail;
 struct xfs_quotainfo;
 struct xfs_da_geometry;
 struct xfs_perag;
 
 /* dynamic preallocation free space thresholds, 5% down to 1% */
 enum {
     XFS_LOWSP_1_PCNT = 0,
     XFS_LOWSP_2_PCNT,
     XFS_LOWSP_3_PCNT,
     XFS_LOWSP_4_PCNT,
     XFS_LOWSP_5_PCNT,
     XFS_LOWSP_MAX,
 };
 
 /*
  * Error Configuration
  *
  * Error classes define the subsystem the configuration belongs to.
  * Error numbers define the errors that are configurable.
  */
 enum {
     XFS_ERR_METADATA,
     XFS_ERR_CLASS_MAX,
 };
 enum {
     XFS_ERR_DEFAULT,
     XFS_ERR_EIO,
     XFS_ERR_ENOSPC,
     XFS_ERR_ENODEV,
     XFS_ERR_ERRNO_MAX,
 };
 
 #define XFS_ERR_RETRY_FOREVER   -1
 
 /*
  * Although retry_timeout is in jiffies which is normally an unsigned long,
  * we limit the retry timeout to 86400 seconds, or one day.  So even a
  * signed 32-bit long is sufficient for a HZ value up to 24855.  Making it
  * signed lets us store the special "-1" value, meaning retry forever.
  */
 struct xfs_error_cfg {
     struct xfs_kobj kobj;
     int     max_retries;
     long        retry_timeout;  /* in jiffies, -1 = infinite */
 };
 
 /*
  * Per-cpu deferred inode inactivation GC lists.
  */
 struct xfs_inodegc {
     struct llist_head   list;
     struct delayed_work work;
 
     /* approximate count of inodes in the list */
     unsigned int        items;
     unsigned int        shrinker_hits;
 };
 
 /*
  * The struct xfsmount layout is optimised to separate read-mostly variables
  * from variables that are frequently modified. We put the read-mostly variables
  * first, then place all the other variables at the end.
  *
  * Typically, read-mostly variables are those that are set at mount time and
  * never changed again, or only change rarely as a result of things like sysfs
  * knobs being tweaked.
  */
 typedef struct xfs_mount {
     struct xfs_sb       m_sb;       /* copy of fs superblock */
     struct super_block  *m_super;
     struct xfs_ail      *m_ail;     /* fs active log item list */
     struct xfs_buf      *m_sb_bp;   /* buffer for superblock */
     char            *m_rtname;  /* realtime device name */
     char            *m_logname; /* external log device name */
     struct xfs_da_geometry  *m_dir_geo; /* directory block geometry */
     struct xfs_da_geometry  *m_attr_geo;    /* attribute block geometry */
     struct xlog     *m_log;     /* log specific stuff */
     struct xfs_inode    *m_rbmip;   /* pointer to bitmap inode */
     struct xfs_inode    *m_rsumip;  /* pointer to summary inode */
     struct xfs_inode    *m_rootip;  /* pointer to root directory */
     struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
     xfs_buftarg_t       *m_ddev_targp;  /* saves taking the address */
     xfs_buftarg_t       *m_logdev_targp;/* ptr to log device */
     xfs_buftarg_t       *m_rtdev_targp; /* ptr to rt device */
     struct list_head    m_mount_list;   /* global mount list */
     void __percpu       *m_inodegc; /* percpu inodegc structures */
 
     /*
      * Optional cache of rt summary level per bitmap block with the
      * invariant that m_rsum_cache[bbno] <= the minimum i for which
      * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
      * inode lock.
      */
     uint8_t         *m_rsum_cache;
     struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
     struct workqueue_struct *m_buf_workqueue;
     struct workqueue_struct *m_unwritten_workqueue;
     struct workqueue_struct *m_reclaim_workqueue;
     struct workqueue_struct *m_sync_workqueue;
     struct workqueue_struct *m_blockgc_wq;
     struct workqueue_struct *m_inodegc_wq;
 
     int         m_bsize;    /* fs logical block size */
     uint8_t         m_blkbit_log;   /* blocklog + NBBY */
     uint8_t         m_blkbb_log;    /* blocklog - BBSHIFT */
     uint8_t         m_agno_log; /* log #ag's */
     uint8_t         m_sectbb_log;   /* sectlog - BBSHIFT */
     uint            m_blockmask;    /* sb_blocksize-1 */
     uint            m_blockwsize;   /* sb_blocksize in words */
     uint            m_blockwmask;   /* blockwsize-1 */
     uint            m_alloc_mxr[2]; /* max alloc btree records */
     uint            m_alloc_mnr[2]; /* min alloc btree records */
     uint            m_bmap_dmxr[2]; /* max bmap btree records */
     uint            m_bmap_dmnr[2]; /* min bmap btree records */
     uint            m_rmap_mxr[2];  /* max rmap btree records */
     uint            m_rmap_mnr[2];  /* min rmap btree records */
     uint            m_refc_mxr[2];  /* max refc btree records */
     uint            m_refc_mnr[2];  /* min refc btree records */
     uint            m_alloc_maxlevels; /* max alloc btree levels */
     uint            m_bm_maxlevels[2]; /* max bmap btree levels */
     uint            m_rmap_maxlevels; /* max rmap btree levels */
     uint            m_refc_maxlevels; /* max refcount btree level */
     unsigned int        m_agbtree_maxlevels; /* max level of all AG btrees */
     xfs_extlen_t        m_ag_prealloc_blocks; /* reserved ag blocks */
     uint            m_alloc_set_aside; /* space we can't use */
     uint            m_ag_max_usable; /* max space per AG */
     int         m_dalign;   /* stripe unit */
     int         m_swidth;   /* stripe width */
     xfs_agnumber_t      m_maxagi;   /* highest inode alloc group */
     uint            m_allocsize_log;/* min write size log bytes */
     uint            m_allocsize_blocks; /* min write size blocks */
     int         m_logbufs;  /* number of log buffers */
     int         m_logbsize; /* size of each log buffer */
     uint            m_rsumlevels;   /* rt summary levels */
     uint            m_rsumsize; /* size of rt summary, bytes */
     int         m_fixedfsid[2]; /* unchanged for life of FS */
     uint            m_qflags;   /* quota status flags */
     uint64_t        m_features; /* active filesystem features */
     uint64_t        m_low_space[XFS_LOWSP_MAX];
     uint64_t        m_low_rtexts[XFS_LOWSP_MAX];
     struct xfs_ino_geometry m_ino_geo;  /* inode geometry */
     struct xfs_trans_resv   m_resv;     /* precomputed res values */
                         /* low free space thresholds */
     unsigned long       m_opstate;  /* dynamic state flags */
     bool            m_always_cow;
     bool            m_fail_unmount;
     bool            m_finobt_nores; /* no per-AG finobt resv. */
     bool            m_update_sb;    /* sb needs update in mount */
 
     /*
      * Bitsets of per-fs metadata that have been checked and/or are sick.
      * Callers must hold m_sb_lock to access these two fields.
      */
     uint8_t         m_fs_checked;
     uint8_t         m_fs_sick;
     /*
      * Bitsets of rt metadata that have been checked and/or are sick.
      * Callers must hold m_sb_lock to access this field.
      */
     uint8_t         m_rt_checked;
     uint8_t         m_rt_sick;
 
     /*
      * End of read-mostly variables. Frequently written variables and locks
      * should be placed below this comment from now on. The first variable
      * here is marked as cacheline aligned so they it is separated from
      * the read-mostly variables.
      */
 
     spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */
     struct percpu_counter   m_icount;   /* allocated inodes counter */
     struct percpu_counter   m_ifree;    /* free inodes counter */
     struct percpu_counter   m_fdblocks; /* free block counter */
     struct percpu_counter   m_frextents;    /* free rt extent counter */
 
     /*
      * Count of data device blocks reserved for delayed allocations,
      * including indlen blocks.  Does not include allocated CoW staging
      * extents or anything related to the rt device.
      */
     struct percpu_counter   m_delalloc_blks;
     /*
      * Global count of allocation btree blocks in use across all AGs. Only
      * used when perag reservation is enabled. Helps prevent block
      * reservation from attempting to reserve allocation btree blocks.
      */
     atomic64_t      m_allocbt_blks;
 
     struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
     spinlock_t      m_perag_lock;   /* lock for m_perag_tree */
     uint64_t        m_resblks;  /* total reserved blocks */
     uint64_t        m_resblks_avail;/* available reserved blocks */
     uint64_t        m_resblks_save; /* reserved blks @ remount,ro */
     struct delayed_work m_reclaim_work; /* background inode reclaim */
     struct xfs_kobj     m_kobj;
     struct xfs_kobj     m_error_kobj;
     struct xfs_kobj     m_error_meta_kobj;
     struct xfs_error_cfg    m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
     struct xstats       m_stats;    /* per-fs stats */
     xfs_agnumber_t      m_agfrotor; /* last ag where space found */
     xfs_agnumber_t      m_agirotor; /* last ag dir inode alloced */
     spinlock_t      m_agirotor_lock;/* .. and lock protecting it */
 
     /* Memory shrinker to throttle and reprioritize inodegc */
     struct shrinker     m_inodegc_shrinker;
     /*
      * Workqueue item so that we can coalesce multiple inode flush attempts
      * into a single flush.
      */
     struct work_struct  m_flush_inodes_work;
 
     /*
      * Generation of the filesysyem layout.  This is incremented by each
      * growfs, and used by the pNFS server to ensure the client updates
      * its view of the block device once it gets a layout that might
      * reference the newly added blocks.  Does not need to be persistent
      * as long as we only allow file system size increments, but if we
      * ever support shrinks it would have to be persisted in addition
      * to various other kinds of pain inflicted on the pNFS server.
      */
     uint32_t        m_generation;
     struct mutex        m_growlock; /* growfs mutex */
 
 #ifdef DEBUG
     /*
      * Frequency with which errors are injected.  Replaces xfs_etest; the
      * value stored in here is the inverse of the frequency with which the
      * error triggers.  1 = always, 2 = half the time, etc.
      */
     unsigned int        *m_errortag;
     struct xfs_kobj     m_errortag_kobj;
 #endif
 } xfs_mount_t;
 
 #define M_IGEO(mp)      (&(mp)->m_ino_geo)
 
 /*
  * Flags for m_features.
  *
  * These are all the active features in the filesystem, regardless of how
  * they are configured.
  */
 #define XFS_FEAT_ATTR       (1ULL << 0) /* xattrs present in fs */
 #define XFS_FEAT_NLINK      (1ULL << 1) /* 32 bit link counts */
 #define XFS_FEAT_QUOTA      (1ULL << 2) /* quota active */
 #define XFS_FEAT_ALIGN      (1ULL << 3) /* inode alignment */
 #define XFS_FEAT_DALIGN     (1ULL << 4) /* data alignment */
 #define XFS_FEAT_LOGV2      (1ULL << 5) /* version 2 logs */
 #define XFS_FEAT_SECTOR     (1ULL << 6) /* sector size > 512 bytes */
 #define XFS_FEAT_EXTFLG     (1ULL << 7) /* unwritten extents */
 #define XFS_FEAT_ASCIICI    (1ULL << 8) /* ASCII only case-insens. */
 #define XFS_FEAT_LAZYSBCOUNT    (1ULL << 9) /* Superblk counters */
 #define XFS_FEAT_ATTR2      (1ULL << 10)    /* dynamic attr fork */
 #define XFS_FEAT_PARENT     (1ULL << 11)    /* parent pointers */
 #define XFS_FEAT_PROJID32   (1ULL << 12)    /* 32 bit project id */
 #define XFS_FEAT_CRC        (1ULL << 13)    /* metadata CRCs */
 #define XFS_FEAT_V3INODES   (1ULL << 14)    /* Version 3 inodes */
 #define XFS_FEAT_PQUOTINO   (1ULL << 15)    /* non-shared proj/grp quotas */
 #define XFS_FEAT_FTYPE      (1ULL << 16)    /* inode type in dir */
 #define XFS_FEAT_FINOBT     (1ULL << 17)    /* free inode btree */
 #define XFS_FEAT_RMAPBT     (1ULL << 18)    /* reverse map btree */
 #define XFS_FEAT_REFLINK    (1ULL << 19)    /* reflinked files */
 #define XFS_FEAT_SPINODES   (1ULL << 20)    /* sparse inode chunks */
 #define XFS_FEAT_META_UUID  (1ULL << 21)    /* metadata UUID */
 #define XFS_FEAT_REALTIME   (1ULL << 22)    /* realtime device present */
 #define XFS_FEAT_INOBTCNT   (1ULL << 23)    /* inobt block counts */
 #define XFS_FEAT_BIGTIME    (1ULL << 24)    /* large timestamps */
 #define XFS_FEAT_NEEDSREPAIR    (1ULL << 25)    /* needs xfs_repair */
 #define XFS_FEAT_NREXT64    (1ULL << 26)    /* large extent counters */
 
 /* Mount features */
 #define XFS_FEAT_NOATTR2    (1ULL << 48)    /* disable attr2 creation */
 #define XFS_FEAT_NOALIGN    (1ULL << 49)    /* ignore alignment */
 #define XFS_FEAT_ALLOCSIZE  (1ULL << 50)    /* user specified allocation size */
 #define XFS_FEAT_LARGE_IOSIZE   (1ULL << 51)    /* report large preferred
                          * I/O size in stat() */
 #define XFS_FEAT_WSYNC      (1ULL << 52)    /* synchronous metadata ops */
 #define XFS_FEAT_DIRSYNC    (1ULL << 53)    /* synchronous directory ops */
 #define XFS_FEAT_DISCARD    (1ULL << 54)    /* discard unused blocks */
 #define XFS_FEAT_GRPID      (1ULL << 55)    /* group-ID assigned from directory */
 #define XFS_FEAT_SMALL_INUMS    (1ULL << 56)    /* user wants 32bit inodes */
 #define XFS_FEAT_IKEEP      (1ULL << 57)    /* keep empty inode clusters*/
 #define XFS_FEAT_SWALLOC    (1ULL << 58)    /* stripe width allocation */
 #define XFS_FEAT_FILESTREAMS    (1ULL << 59)    /* use filestreams allocator */
 #define XFS_FEAT_DAX_ALWAYS (1ULL << 60)    /* DAX always enabled */
 #define XFS_FEAT_DAX_NEVER  (1ULL << 61)    /* DAX never enabled */
 #define XFS_FEAT_NORECOVERY (1ULL << 62)    /* no recovery - dirty fs */
 #define XFS_FEAT_NOUUID     (1ULL << 63)    /* ignore uuid during mount */
 
 #define __XFS_HAS_FEAT(name, NAME) \
 static inline bool xfs_has_ ## name (struct xfs_mount *mp) \
 { \
     return mp->m_features & XFS_FEAT_ ## NAME; \
 }
 
 /* Some features can be added dynamically so they need a set wrapper, too. */
 #define __XFS_ADD_FEAT(name, NAME) \
     __XFS_HAS_FEAT(name, NAME); \
 static inline void xfs_add_ ## name (struct xfs_mount *mp) \
 { \
     mp->m_features |= XFS_FEAT_ ## NAME; \
     xfs_sb_version_add ## name(&mp->m_sb); \
 }
 
 /* Superblock features */
 __XFS_ADD_FEAT(attr, ATTR)
 __XFS_HAS_FEAT(nlink, NLINK)
 __XFS_ADD_FEAT(quota, QUOTA)
 __XFS_HAS_FEAT(align, ALIGN)
 __XFS_HAS_FEAT(dalign, DALIGN)
 __XFS_HAS_FEAT(logv2, LOGV2)
 __XFS_HAS_FEAT(sector, SECTOR)
 __XFS_HAS_FEAT(extflg, EXTFLG)
 __XFS_HAS_FEAT(asciici, ASCIICI)
 __XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
 __XFS_ADD_FEAT(attr2, ATTR2)
 __XFS_HAS_FEAT(parent, PARENT)
 __XFS_ADD_FEAT(projid32, PROJID32)
 __XFS_HAS_FEAT(crc, CRC)
 __XFS_HAS_FEAT(v3inodes, V3INODES)
 __XFS_HAS_FEAT(pquotino, PQUOTINO)
 __XFS_HAS_FEAT(ftype, FTYPE)
 __XFS_HAS_FEAT(finobt, FINOBT)
 __XFS_HAS_FEAT(rmapbt, RMAPBT)
 __XFS_HAS_FEAT(reflink, REFLINK)
 __XFS_HAS_FEAT(sparseinodes, SPINODES)
 __XFS_HAS_FEAT(metauuid, META_UUID)
 __XFS_HAS_FEAT(realtime, REALTIME)
 __XFS_HAS_FEAT(inobtcounts, INOBTCNT)
 __XFS_HAS_FEAT(bigtime, BIGTIME)
 __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
 __XFS_HAS_FEAT(large_extent_counts, NREXT64)
 
 /*
  * Mount features
  *
  * These do not change dynamically - features that can come and go, such as 32
  * bit inodes and read-only state, are kept as operational state rather than
  * features.
  */
 __XFS_HAS_FEAT(noattr2, NOATTR2)
 __XFS_HAS_FEAT(noalign, NOALIGN)
 __XFS_HAS_FEAT(allocsize, ALLOCSIZE)
 __XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE)
 __XFS_HAS_FEAT(wsync, WSYNC)
 __XFS_HAS_FEAT(dirsync, DIRSYNC)
 __XFS_HAS_FEAT(discard, DISCARD)
 __XFS_HAS_FEAT(grpid, GRPID)
 __XFS_HAS_FEAT(small_inums, SMALL_INUMS)
 __XFS_HAS_FEAT(ikeep, IKEEP)
 __XFS_HAS_FEAT(swalloc, SWALLOC)
 __XFS_HAS_FEAT(filestreams, FILESTREAMS)
 __XFS_HAS_FEAT(dax_always, DAX_ALWAYS)
 __XFS_HAS_FEAT(dax_never, DAX_NEVER)
 __XFS_HAS_FEAT(norecovery, NORECOVERY)
 __XFS_HAS_FEAT(nouuid, NOUUID)
 
 /*
  * Operational mount state flags
  *
  * Use these with atomic bit ops only!
  */
 #define XFS_OPSTATE_UNMOUNTING      0   /* filesystem is unmounting */
 #define XFS_OPSTATE_CLEAN       1   /* mount was clean */
 #define XFS_OPSTATE_SHUTDOWN        2   /* stop all fs operations */
 #define XFS_OPSTATE_INODE32     3   /* inode32 allocator active */
 #define XFS_OPSTATE_READONLY        4   /* read-only fs */
 
 /*
  * If set, inactivation worker threads will be scheduled to process queued
  * inodegc work.  If not, queued inodes remain in memory waiting to be
  * processed.
  */
 #define XFS_OPSTATE_INODEGC_ENABLED 5
 /*
  * If set, background speculative prealloc gc worker threads will be scheduled
  * to process queued blockgc work.  If not, inodes retain their preallocations
  * until explicitly deleted.
  */
 #define XFS_OPSTATE_BLOCKGC_ENABLED 6
 
 /* Kernel has logged a warning about online fsck being used on this fs. */
 #define XFS_OPSTATE_WARNED_SCRUB    7
 /* Kernel has logged a warning about shrink being used on this fs. */
 #define XFS_OPSTATE_WARNED_SHRINK   8
 /* Kernel has logged a warning about logged xattr updates being used. */
 #define XFS_OPSTATE_WARNED_LARP     9
 
 #define __XFS_IS_OPSTATE(name, NAME) \
 static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
 { \
     return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
 } \
 static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
 { \
     return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
 } \
 static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
 { \
     return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
 }
 
 __XFS_IS_OPSTATE(unmounting, UNMOUNTING)
 __XFS_IS_OPSTATE(clean, CLEAN)
 __XFS_IS_OPSTATE(shutdown, SHUTDOWN)
 __XFS_IS_OPSTATE(inode32, INODE32)
 __XFS_IS_OPSTATE(readonly, READONLY)
 __XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED)
 __XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED)
 
 static inline bool
 xfs_should_warn(struct xfs_mount *mp, long nr)
 {
     return !test_and_set_bit(nr, &mp->m_opstate);
 }
 
 #define XFS_OPSTATE_STRINGS \
     { (1UL << XFS_OPSTATE_UNMOUNTING),      "unmounting" }, \
     { (1UL << XFS_OPSTATE_CLEAN),           "clean" }, \
     { (1UL << XFS_OPSTATE_SHUTDOWN),        "shutdown" }, \
     { (1UL << XFS_OPSTATE_INODE32),         "inode32" }, \
     { (1UL << XFS_OPSTATE_READONLY),        "read_only" }, \
     { (1UL << XFS_OPSTATE_INODEGC_ENABLED),     "inodegc" }, \
     { (1UL << XFS_OPSTATE_BLOCKGC_ENABLED),     "blockgc" }, \
     { (1UL << XFS_OPSTATE_WARNED_SCRUB),        "wscrub" }, \
     { (1UL << XFS_OPSTATE_WARNED_SHRINK),       "wshrink" }, \
     { (1UL << XFS_OPSTATE_WARNED_LARP),     "wlarp" }
 
 /*
  * Max and min values for mount-option defined I/O
  * preallocation sizes.
  */
 #define XFS_MAX_IO_LOG      30  /* 1G */
 #define XFS_MIN_IO_LOG      PAGE_SHIFT
 
 void xfs_do_force_shutdown(struct xfs_mount *mp, uint32_t flags, char *fname,
         int lnnum);
 #define xfs_force_shutdown(m,f) \
     xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 
 #define SHUTDOWN_META_IO_ERROR  (1u << 0) /* write attempt to metadata failed */
 #define SHUTDOWN_LOG_IO_ERROR   (1u << 1) /* write attempt to the log failed */
 #define SHUTDOWN_FORCE_UMOUNT   (1u << 2) /* shutdown from a forced unmount */
 #define SHUTDOWN_CORRUPT_INCORE (1u << 3) /* corrupt in-memory structures */
 #define SHUTDOWN_CORRUPT_ONDISK (1u << 4)  /* corrupt metadata on device */
 
 #define XFS_SHUTDOWN_STRINGS \
     { SHUTDOWN_META_IO_ERROR,   "metadata_io" }, \
     { SHUTDOWN_LOG_IO_ERROR,    "log_io" }, \
     { SHUTDOWN_FORCE_UMOUNT,    "force_umount" }, \
     { SHUTDOWN_CORRUPT_INCORE,  "corruption" }
 
 /*
  * Flags for xfs_mountfs
  */
 #define XFS_MFSI_QUIET      0x40    /* Be silent if mount errors found */
 
 static inline xfs_agnumber_t
 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 {
     xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
     do_div(ld, mp->m_sb.sb_agblocks);
     return (xfs_agnumber_t) ld;
 }
 
 static inline xfs_agblock_t
 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 {
     xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
     return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 }
 
 int xfs_buf_hash_init(struct xfs_perag *pag);
 void xfs_buf_hash_destroy(struct xfs_perag *pag);
 
 extern void xfs_uuid_table_free(void);
 extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
 extern int  xfs_mountfs(xfs_mount_t *mp);
 extern void xfs_unmountfs(xfs_mount_t *);
 
 /*
  * Deltas for the block count can vary from 1 to very large, but lock contention
  * only occurs on frequent small block count updates such as in the delayed
  * allocation path for buffered writes (page a time updates). Hence we set
  * a large batch count (1024) to minimise global counter updates except when
  * we get near to ENOSPC and we have to be very accurate with our updates.
  */
 #define XFS_FDBLOCKS_BATCH  1024
 
 /*
  * Estimate the amount of free space that is not available to userspace and is
  * not explicitly reserved from the incore fdblocks.  This includes:
  *
  * - The minimum number of blocks needed to support splitting a bmap btree
  * - The blocks currently in use by the freespace btrees because they record
  *   the actual blocks that will fill per-AG metadata space reservations
  */
 static inline uint64_t
 xfs_fdblocks_unavailable(
     struct xfs_mount    *mp)
 {
     return mp->m_alloc_set_aside + atomic64_read(&mp->m_allocbt_blks);
 }
 
 int xfs_mod_freecounter(struct xfs_mount *mp, struct percpu_counter *counter,
         int64_t delta, bool rsvd);
 
 static inline int
 xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, bool reserved)
 {
     return xfs_mod_freecounter(mp, &mp->m_fdblocks, delta, reserved);
 }
 
 static inline int
 xfs_mod_frextents(struct xfs_mount *mp, int64_t delta)
 {
     return xfs_mod_freecounter(mp, &mp->m_frextents, delta, false);
 }
 
 extern int  xfs_readsb(xfs_mount_t *, int);
 extern void xfs_freesb(xfs_mount_t *);
 extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
 extern int  xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
 
 extern int  xfs_dev_is_read_only(struct xfs_mount *, char *);
 
 extern void xfs_set_low_space_thresholds(struct xfs_mount *);
 
 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
             xfs_off_t count_fsb);
 
 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
         int error_class, int error);
 void xfs_force_summary_recalc(struct xfs_mount *mp);
 int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature);
 bool xfs_clear_incompat_log_features(struct xfs_mount *mp);
 void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
 
 #endif  /* __XFS_MOUNT_H__ */

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