fs/xfs/xfs_mount.h - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  * All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it would be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write the Free Software Foundation,
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 #ifndef __XFS_MOUNT_H__
 #define	__XFS_MOUNT_H__

 typedef struct xfs_trans_reservations {
 	uint	tr_write;	/* extent alloc trans */
 	uint	tr_itruncate;	/* truncate trans */
 	uint	tr_rename;	/* rename trans */
 	uint	tr_link;	/* link trans */
 	uint	tr_remove;	/* unlink trans */
 	uint	tr_symlink;	/* symlink trans */
 	uint	tr_create;	/* create trans */
 	uint	tr_mkdir;	/* mkdir trans */
 	uint	tr_ifree;	/* inode free trans */
 	uint	tr_ichange;	/* inode update trans */
 	uint	tr_growdata;	/* fs data section grow trans */
 	uint	tr_swrite;	/* sync write inode trans */
 	uint	tr_addafork;	/* cvt inode to attributed trans */
 	uint	tr_writeid;	/* write setuid/setgid file */
 	uint	tr_attrinval;	/* attr fork buffer invalidation */
 	uint	tr_attrset;	/* set/create an attribute */
 	uint	tr_attrrm;	/* remove an attribute */
 	uint	tr_clearagi;	/* clear bad agi unlinked ino bucket */
 	uint	tr_growrtalloc;	/* grow realtime allocations */
 	uint	tr_growrtzero;	/* grow realtime zeroing */
 	uint	tr_growrtfree;	/* grow realtime freeing */
 } xfs_trans_reservations_t;

 #ifndef __KERNEL__

 #define xfs_daddr_to_agno(mp,d) \
 	((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
 #define xfs_daddr_to_agbno(mp,d) \
 	((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))

 #else /* __KERNEL__ */

 #include "xfs_sync.h"

 struct log;
 struct xfs_mount_args;
 struct xfs_inode;
 struct xfs_bmbt_irec;
 struct xfs_bmap_free;
 struct xfs_extdelta;
 struct xfs_swapext;
 struct xfs_mru_cache;
 struct xfs_nameops;
 struct xfs_ail;
 struct xfs_quotainfo;

 #ifdef HAVE_PERCPU_SB

 /*
  * Valid per-cpu incore superblock counters. Note that if you add new counters,
  * you may need to define new counter disabled bit field descriptors as there
  * are more possible fields in the superblock that can fit in a bitfield on a
  * 32 bit platform. The XFS_SBS_* values for the current current counters just
  * fit.
  */
 typedef struct xfs_icsb_cnts {
 	uint64_t	icsb_fdblocks;
 	uint64_t	icsb_ifree;
 	uint64_t	icsb_icount;
 	unsigned long	icsb_flags;
 } xfs_icsb_cnts_t;

 #define XFS_ICSB_FLAG_LOCK	(1 << 0)	/* counter lock bit */

 #define XFS_ICSB_LAZY_COUNT	(1 << 1)	/* accuracy not needed */

 extern int	xfs_icsb_init_counters(struct xfs_mount *);
 extern void	xfs_icsb_reinit_counters(struct xfs_mount *);
 extern void	xfs_icsb_destroy_counters(struct xfs_mount *);
 extern void	xfs_icsb_sync_counters(struct xfs_mount *, int);
 extern void	xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
 extern int	xfs_icsb_modify_counters(struct xfs_mount *, xfs_sb_field_t,
 						int64_t, int);

 #else
 #define xfs_icsb_init_counters(mp)		(0)
 #define xfs_icsb_destroy_counters(mp)		do { } while (0)
 #define xfs_icsb_reinit_counters(mp)		do { } while (0)
 #define xfs_icsb_sync_counters(mp, flags)	do { } while (0)
 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
 #define xfs_icsb_modify_counters(mp, field, delta, rsvd) \
 	xfs_mod_incore_sb(mp, field, delta, rsvd)
 #endif

 /* 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,
 };

 typedef struct xfs_mount {
 	struct super_block	*m_super;
 	xfs_tid_t		m_tid;		/* next unused tid for fs */
 	struct xfs_ail		*m_ail;		/* fs active log item list */
 	xfs_sb_t		m_sb;		/* copy of fs superblock */
 	spinlock_t		m_sb_lock;	/* sb counter lock */
 	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
 	char			*m_fsname;	/* filesystem name */
 	int			m_fsname_len;	/* strlen of fs name */
 	char			*m_rtname;	/* realtime device name */
 	char			*m_logname;	/* external log device name */
 	int			m_bsize;	/* fs logical block size */
 	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 */
 	xfs_agnumber_t		m_maxagi;	/* highest inode alloc group */
 	uint			m_readio_log;	/* min read size log bytes */
 	uint			m_readio_blocks; /* min read size blocks */
 	uint			m_writeio_log;	/* min write size log bytes */
 	uint			m_writeio_blocks; /* min write size blocks */
 	struct log		*m_log;		/* log specific stuff */
 	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 */
 	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 */
 	__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_agino_log;	/* #bits for agino in inum */
 	__uint16_t		m_inode_cluster_size;/* min inode buf size */
 	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_inobt_mxr[2];	/* max inobt btree records */
 	uint			m_inobt_mnr[2];	/* min inobt btree records */
 	uint			m_ag_maxlevels;	/* XFS_AG_MAXLEVELS */
 	uint			m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 	uint			m_in_maxlevels;	/* max inobt btree levels. */
 	struct radix_tree_root	m_perag_tree;	/* per-ag accounting info */
 	spinlock_t		m_perag_lock;	/* lock for m_perag_tree */
 	struct mutex		m_growlock;	/* growfs mutex */
 	int			m_fixedfsid[2];	/* unchanged for life of FS */
 	uint			m_dmevmask;	/* DMI events for this FS */
 	__uint64_t		m_flags;	/* global mount flags */
 	uint			m_dir_node_ents; /* #entries in a dir danode */
 	uint			m_attr_node_ents; /* #entries in attr danode */
 	int			m_ialloc_inos;	/* inodes in inode allocation */
 	int			m_ialloc_blks;	/* blocks in inode allocation */
 	int			m_inoalign_mask;/* mask sb_inoalignmt if used */
 	uint			m_qflags;	/* quota status flags */
 	xfs_trans_reservations_t m_reservations;/* precomputed res values */
 	__uint64_t		m_maxicount;	/* maximum inode count */
 	__uint64_t		m_maxioffset;	/* maximum inode offset */
 	__uint64_t		m_resblks;	/* total reserved blocks */
 	__uint64_t		m_resblks_avail;/* available reserved blocks */
 	__uint64_t		m_resblks_save;	/* reserved blks @ remount,ro */
 	int			m_dalign;	/* stripe unit */
 	int			m_swidth;	/* stripe width */
 	int			m_sinoalign;	/* stripe unit inode alignment */
 	int			m_attr_magicpct;/* 37% of the blocksize */
 	int			m_dir_magicpct;	/* 37% of the dir blocksize */
 	__uint8_t		m_sectbb_log;	/* sectlog - BBSHIFT */
 	const struct xfs_nameops *m_dirnameops;	/* vector of dir name ops */
 	int			m_dirblksize;	/* directory block sz--bytes */
 	int			m_dirblkfsbs;	/* directory block sz--fsbs */
 	xfs_dablk_t		m_dirdatablk;	/* blockno of dir data v2 */
 	xfs_dablk_t		m_dirleafblk;	/* blockno of dir non-data v2 */
 	xfs_dablk_t		m_dirfreeblk;	/* blockno of dirfreeindex v2 */
 	uint			m_chsize;	/* size of next field */
 	struct xfs_chash	*m_chash;	/* fs private inode per-cluster
 						 * hash table */
 	atomic_t		m_active_trans;	/* number trans frozen */
 #ifdef HAVE_PERCPU_SB
 	xfs_icsb_cnts_t __percpu *m_sb_cnts;	/* per-cpu superblock counters */
 	unsigned long		m_icsb_counters; /* disabled per-cpu counters */
 	struct notifier_block	m_icsb_notifier; /* hotplug cpu notifier */
 	struct mutex		m_icsb_mutex;	/* balancer sync lock */
 #endif
 	struct xfs_mru_cache	*m_filestream;  /* per-mount filestream data */
 	struct delayed_work	m_sync_work;	/* background sync work */
 	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
 	struct work_struct	m_flush_work;	/* background inode flush */
 	__int64_t		m_update_flags;	/* sb flags we need to update
 						   on the next remount,rw */
 	struct shrinker		m_inode_shrink;	/* inode reclaim shrinker */
 	int64_t			m_low_space[XFS_LOWSP_MAX];
 						/* low free space thresholds */
 } xfs_mount_t;

 /*
  * Flags for m_flags.
  */
 #define XFS_MOUNT_WSYNC		(1ULL << 0)	/* for nfs - all metadata ops
 						   must be synchronous except
 						   for space allocations */
 #define XFS_MOUNT_WAS_CLEAN	(1ULL << 3)
 #define XFS_MOUNT_FS_SHUTDOWN	(1ULL << 4)	/* atomic stop of all filesystem
 						   operations, typically for
 						   disk errors in metadata */
 #define XFS_MOUNT_DISCARD	(1ULL << 5)	/* discard unused blocks */
 #define XFS_MOUNT_RETERR	(1ULL << 6)     /* return alignment errors to
 						   user */
 #define XFS_MOUNT_NOALIGN	(1ULL << 7)	/* turn off stripe alignment
 						   allocations */
 #define XFS_MOUNT_ATTR2		(1ULL << 8)	/* allow use of attr2 format */
 #define XFS_MOUNT_GRPID		(1ULL << 9)	/* group-ID assigned from directory */
 #define XFS_MOUNT_NORECOVERY	(1ULL << 10)	/* no recovery - dirty fs */
 #define XFS_MOUNT_DFLT_IOSIZE	(1ULL << 12)	/* set default i/o size */
 #define XFS_MOUNT_32BITINODES	(1ULL << 14)	/* do not create inodes above
 						 * 32 bits in size */
 #define XFS_MOUNT_SMALL_INUMS	(1ULL << 15)	/* users wants 32bit inodes */
 #define XFS_MOUNT_NOUUID	(1ULL << 16)	/* ignore uuid during mount */
 #define XFS_MOUNT_BARRIER	(1ULL << 17)
 #define XFS_MOUNT_IKEEP		(1ULL << 18)	/* keep empty inode clusters*/
 #define XFS_MOUNT_SWALLOC	(1ULL << 19)	/* turn on stripe width
 						 * allocation */
 #define XFS_MOUNT_RDONLY	(1ULL << 20)	/* read-only fs */
 #define XFS_MOUNT_DIRSYNC	(1ULL << 21)	/* synchronous directory ops */
 #define XFS_MOUNT_COMPAT_IOSIZE	(1ULL << 22)	/* don't report large preferred
 						 * I/O size in stat() */
 #define XFS_MOUNT_FILESTREAMS	(1ULL << 24)	/* enable the filestreams
 						   allocator */
 #define XFS_MOUNT_NOATTR2	(1ULL << 25)	/* disable use of attr2 format */


 /*
  * Default minimum read and write sizes.
  */
 #define XFS_READIO_LOG_LARGE	16
 #define XFS_WRITEIO_LOG_LARGE	16

 /*
  * 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

 /*
  * Synchronous read and write sizes.  This should be
  * better for NFSv2 wsync filesystems.
  */
 #define	XFS_WSYNC_READIO_LOG	15	/* 32k */
 #define	XFS_WSYNC_WRITEIO_LOG	14	/* 16k */

 /*
  * Allow large block sizes to be reported to userspace programs if the
  * "largeio" mount option is used.
  *
  * If compatibility mode is specified, simply return the basic unit of caching
  * so that we don't get inefficient read/modify/write I/O from user apps.
  * Otherwise....
  *
  * If the underlying volume is a stripe, then return the stripe width in bytes
  * as the recommended I/O size. It is not a stripe and we've set a default
  * buffered I/O size, return that, otherwise return the compat default.
  */
 static inline unsigned long
 xfs_preferred_iosize(xfs_mount_t *mp)
 {
 	if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 		return PAGE_CACHE_SIZE;
 	return (mp->m_swidth ?
 		(mp->m_swidth << mp->m_sb.sb_blocklog) :
 		((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 			(1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 			PAGE_CACHE_SIZE));
 }

 #define XFS_MAXIOFFSET(mp)	((mp)->m_maxioffset)

 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)	\
 				((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 #define XFS_FORCED_SHUTDOWN(mp)	((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 		int lnnum);
 #define xfs_force_shutdown(m,f)	\
 	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)

 #define SHUTDOWN_META_IO_ERROR	0x0001	/* write attempt to metadata failed */
 #define SHUTDOWN_LOG_IO_ERROR	0x0002	/* write attempt to the log failed */
 #define SHUTDOWN_FORCE_UMOUNT	0x0004	/* shutdown from a forced unmount */
 #define SHUTDOWN_CORRUPT_INCORE	0x0008	/* corrupt in-memory data structures */
 #define SHUTDOWN_REMOTE_REQ	0x0010	/* shutdown came from remote cell */
 #define SHUTDOWN_DEVICE_REQ	0x0020	/* failed all paths to the device */

 #define xfs_test_for_freeze(mp)		((mp)->m_super->s_frozen)
 #define xfs_wait_for_freeze(mp,l)	vfs_check_frozen((mp)->m_super, (l))

 /*
  * 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_daddr_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_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 }

 /*
  * perag get/put wrappers for ref counting
  */
 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
 					int tag);
 void	xfs_perag_put(struct xfs_perag *pag);

 /*
  * Per-cpu superblock locking functions
  */
 #ifdef HAVE_PERCPU_SB
 static inline void
 xfs_icsb_lock(xfs_mount_t *mp)
 {
 	mutex_lock(&mp->m_icsb_mutex);
 }

 static inline void
 xfs_icsb_unlock(xfs_mount_t *mp)
 {
 	mutex_unlock(&mp->m_icsb_mutex);
 }
 #else
 #define xfs_icsb_lock(mp)
 #define xfs_icsb_unlock(mp)
 #endif

 /*
  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
  * xfs_growfs can specify a few fields which are more than int limit
  */
 typedef struct xfs_mod_sb {
 	xfs_sb_field_t	msb_field;	/* Field to modify, see below */
 	int64_t		msb_delta;	/* Change to make to specified field */
 } xfs_mod_sb_t;

 extern int	xfs_log_sbcount(xfs_mount_t *);
 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 *);
 extern int	xfs_unmountfs_writesb(xfs_mount_t *);
 extern int	xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
 extern int	xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 			uint, int);
 extern int	xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 extern int	xfs_readsb(xfs_mount_t *, int);
 extern void	xfs_freesb(xfs_mount_t *);
 extern int	xfs_fs_writable(xfs_mount_t *);
 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 *);

 #endif	/* __KERNEL__ */

 extern void	xfs_mod_sb(struct xfs_trans *, __int64_t);
 extern int	xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
 					xfs_agnumber_t *);
 extern void	xfs_sb_from_disk(struct xfs_mount *, struct xfs_dsb *);
 extern void	xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);

 #endif	/* __XFS_MOUNT_H__ */
	/*
	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	* All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it would be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/
	#ifndef __XFS_MOUNT_H__
	#define __XFS_MOUNT_H__

	typedef struct xfs_trans_reservations {
	uint tr_write; /* extent alloc trans */
	uint tr_itruncate; /* truncate trans */
	uint tr_rename; /* rename trans */
	uint tr_link; /* link trans */
	uint tr_remove; /* unlink trans */
	uint tr_symlink; /* symlink trans */
	uint tr_create; /* create trans */
	uint tr_mkdir; /* mkdir trans */
	uint tr_ifree; /* inode free trans */
	uint tr_ichange; /* inode update trans */
	uint tr_growdata; /* fs data section grow trans */
	uint tr_swrite; /* sync write inode trans */
	uint tr_addafork; /* cvt inode to attributed trans */
	uint tr_writeid; /* write setuid/setgid file */
	uint tr_attrinval; /* attr fork buffer invalidation */
	uint tr_attrset; /* set/create an attribute */
	uint tr_attrrm; /* remove an attribute */
	uint tr_clearagi; /* clear bad agi unlinked ino bucket */
	uint tr_growrtalloc; /* grow realtime allocations */
	uint tr_growrtzero; /* grow realtime zeroing */
	uint tr_growrtfree; /* grow realtime freeing */
	} xfs_trans_reservations_t;

	#ifndef __KERNEL__

	#define xfs_daddr_to_agno(mp,d) \
	((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
	#define xfs_daddr_to_agbno(mp,d) \
	((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))

	#else /* __KERNEL__ */

	#include "xfs_sync.h"

	struct log;
	struct xfs_mount_args;
	struct xfs_inode;
	struct xfs_bmbt_irec;
	struct xfs_bmap_free;
	struct xfs_extdelta;
	struct xfs_swapext;
	struct xfs_mru_cache;
	struct xfs_nameops;
	struct xfs_ail;
	struct xfs_quotainfo;

	#ifdef HAVE_PERCPU_SB

	/*
	* Valid per-cpu incore superblock counters. Note that if you add new counters,
	* you may need to define new counter disabled bit field descriptors as there
	* are more possible fields in the superblock that can fit in a bitfield on a
	* 32 bit platform. The XFS_SBS_* values for the current current counters just
	* fit.
	*/
	typedef struct xfs_icsb_cnts {
	uint64_t icsb_fdblocks;
	uint64_t icsb_ifree;
	uint64_t icsb_icount;
	unsigned long icsb_flags;
	} xfs_icsb_cnts_t;

	#define XFS_ICSB_FLAG_LOCK (1 << 0) /* counter lock bit */

	#define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */

	extern int xfs_icsb_init_counters(struct xfs_mount *);
	extern void xfs_icsb_reinit_counters(struct xfs_mount *);
	extern void xfs_icsb_destroy_counters(struct xfs_mount *);
	extern void xfs_icsb_sync_counters(struct xfs_mount *, int);
	extern void xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
	extern int xfs_icsb_modify_counters(struct xfs_mount *, xfs_sb_field_t,
	int64_t, int);

	#else
	#define xfs_icsb_init_counters(mp) (0)
	#define xfs_icsb_destroy_counters(mp) do { } while (0)
	#define xfs_icsb_reinit_counters(mp) do { } while (0)
	#define xfs_icsb_sync_counters(mp, flags) do { } while (0)
	#define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
	#define xfs_icsb_modify_counters(mp, field, delta, rsvd) \
	xfs_mod_incore_sb(mp, field, delta, rsvd)
	#endif

	/* 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,
	};

	typedef struct xfs_mount {
	struct super_block *m_super;
	xfs_tid_t m_tid; /* next unused tid for fs */
	struct xfs_ail m_ail; / fs active log item list */
	xfs_sb_t m_sb; /* copy of fs superblock */
	spinlock_t m_sb_lock; /* sb counter lock */
	struct xfs_buf m_sb_bp; / buffer for superblock */
	char m_fsname; / filesystem name */
	int m_fsname_len; /* strlen of fs name */
	char m_rtname; / realtime device name */
	char m_logname; / external log device name */
	int m_bsize; /* fs logical block size */
	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 */
	xfs_agnumber_t m_maxagi; /* highest inode alloc group */
	uint m_readio_log; /* min read size log bytes */
	uint m_readio_blocks; /* min read size blocks */
	uint m_writeio_log; /* min write size log bytes */
	uint m_writeio_blocks; /* min write size blocks */
	struct log m_log; / log specific stuff */
	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 */
	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 */
	__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_agino_log; /* #bits for agino in inum */
	__uint16_t m_inode_cluster_size;/* min inode buf size */
	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_inobt_mxr[2]; /* max inobt btree records */
	uint m_inobt_mnr[2]; /* min inobt btree records */
	uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
	uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
	uint m_in_maxlevels; /* max inobt btree levels. */
	struct radix_tree_root m_perag_tree; /* per-ag accounting info */
	spinlock_t m_perag_lock; /* lock for m_perag_tree */
	struct mutex m_growlock; /* growfs mutex */
	int m_fixedfsid[2]; /* unchanged for life of FS */
	uint m_dmevmask; /* DMI events for this FS */
	__uint64_t m_flags; /* global mount flags */
	uint m_dir_node_ents; /* #entries in a dir danode */
	uint m_attr_node_ents; /* #entries in attr danode */
	int m_ialloc_inos; /* inodes in inode allocation */
	int m_ialloc_blks; /* blocks in inode allocation */
	int m_inoalign_mask;/* mask sb_inoalignmt if used */
	uint m_qflags; /* quota status flags */
	xfs_trans_reservations_t m_reservations;/* precomputed res values */
	__uint64_t m_maxicount; /* maximum inode count */
	__uint64_t m_maxioffset; /* maximum inode offset */
	__uint64_t m_resblks; /* total reserved blocks */
	__uint64_t m_resblks_avail;/* available reserved blocks */
	__uint64_t m_resblks_save; /* reserved blks @ remount,ro */
	int m_dalign; /* stripe unit */
	int m_swidth; /* stripe width */
	int m_sinoalign; /* stripe unit inode alignment */
	int m_attr_magicpct;/* 37% of the blocksize */
	int m_dir_magicpct; /* 37% of the dir blocksize */
	__uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
	const struct xfs_nameops m_dirnameops; / vector of dir name ops */
	int m_dirblksize; /* directory block sz--bytes */
	int m_dirblkfsbs; /* directory block sz--fsbs */
	xfs_dablk_t m_dirdatablk; /* blockno of dir data v2 */
	xfs_dablk_t m_dirleafblk; /* blockno of dir non-data v2 */
	xfs_dablk_t m_dirfreeblk; /* blockno of dirfreeindex v2 */
	uint m_chsize; /* size of next field */
	struct xfs_chash m_chash; / fs private inode per-cluster
	* hash table */
	atomic_t m_active_trans; /* number trans frozen */
	#ifdef HAVE_PERCPU_SB
	xfs_icsb_cnts_t __percpu m_sb_cnts; / per-cpu superblock counters */
	unsigned long m_icsb_counters; /* disabled per-cpu counters */
	struct notifier_block m_icsb_notifier; /* hotplug cpu notifier */
	struct mutex m_icsb_mutex; /* balancer sync lock */
	#endif
	struct xfs_mru_cache m_filestream; / per-mount filestream data */
	struct delayed_work m_sync_work; /* background sync work */
	struct delayed_work m_reclaim_work; /* background inode reclaim */
	struct work_struct m_flush_work; /* background inode flush */
	__int64_t m_update_flags; /* sb flags we need to update
	on the next remount,rw */
	struct shrinker m_inode_shrink; /* inode reclaim shrinker */
	int64_t m_low_space[XFS_LOWSP_MAX];
	/* low free space thresholds */
	} xfs_mount_t;

	/*
	* Flags for m_flags.
	*/
	#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
	must be synchronous except
	for space allocations */
	#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
	#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
	operations, typically for
	disk errors in metadata */
	#define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
	#define XFS_MOUNT_RETERR (1ULL << 6) /* return alignment errors to
	user */
	#define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
	allocations */
	#define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
	#define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
	#define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
	#define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
	#define XFS_MOUNT_32BITINODES (1ULL << 14) /* do not create inodes above
	* 32 bits in size */
	#define XFS_MOUNT_SMALL_INUMS (1ULL << 15) /* users wants 32bit inodes */
	#define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
	#define XFS_MOUNT_BARRIER (1ULL << 17)
	#define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
	#define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
	* allocation */
	#define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
	#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
	#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
	* I/O size in stat() */
	#define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
	allocator */
	#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */


	/*
	* Default minimum read and write sizes.
	*/
	#define XFS_READIO_LOG_LARGE 16
	#define XFS_WRITEIO_LOG_LARGE 16

	/*
	* 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

	/*
	* Synchronous read and write sizes. This should be
	* better for NFSv2 wsync filesystems.
	*/
	#define XFS_WSYNC_READIO_LOG 15 /* 32k */
	#define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */

	/*
	* Allow large block sizes to be reported to userspace programs if the
	* "largeio" mount option is used.
	*
	* If compatibility mode is specified, simply return the basic unit of caching
	* so that we don't get inefficient read/modify/write I/O from user apps.
	* Otherwise....
	*
	* If the underlying volume is a stripe, then return the stripe width in bytes
	* as the recommended I/O size. It is not a stripe and we've set a default
	* buffered I/O size, return that, otherwise return the compat default.
	*/
	static inline unsigned long
	xfs_preferred_iosize(xfs_mount_t *mp)
	{
	if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
	return PAGE_CACHE_SIZE;
	return (mp->m_swidth ?
	(mp->m_swidth << mp->m_sb.sb_blocklog) :
	((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
	(1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
	PAGE_CACHE_SIZE));
	}

	#define XFS_MAXIOFFSET(mp) ((mp)->m_maxioffset)

	#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
	((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
	#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
	void xfs_do_force_shutdown(struct xfs_mount mp, int flags, char fname,
	int lnnum);
	#define xfs_force_shutdown(m,f) \
	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)

	#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
	#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
	#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
	#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
	#define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
	#define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */

	#define xfs_test_for_freeze(mp) ((mp)->m_super->s_frozen)
	#define xfs_wait_for_freeze(mp,l) vfs_check_frozen((mp)->m_super, (l))

	/*
	* 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_daddr_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_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
	}

	/*
	* perag get/put wrappers for ref counting
	*/
	struct xfs_perag xfs_perag_get(struct xfs_mount mp, xfs_agnumber_t agno);
	struct xfs_perag xfs_perag_get_tag(struct xfs_mount mp, xfs_agnumber_t agno,
	int tag);
	void xfs_perag_put(struct xfs_perag *pag);

	/*
	* Per-cpu superblock locking functions
	*/
	#ifdef HAVE_PERCPU_SB
	static inline void
	xfs_icsb_lock(xfs_mount_t *mp)
	{
	mutex_lock(&mp->m_icsb_mutex);
	}

	static inline void
	xfs_icsb_unlock(xfs_mount_t *mp)
	{
	mutex_unlock(&mp->m_icsb_mutex);
	}
	#else
	#define xfs_icsb_lock(mp)
	#define xfs_icsb_unlock(mp)
	#endif

	/*
	* This structure is for use by the xfs_mod_incore_sb_batch() routine.
	* xfs_growfs can specify a few fields which are more than int limit
	*/
	typedef struct xfs_mod_sb {
	xfs_sb_field_t msb_field; /* Field to modify, see below */
	int64_t msb_delta; /* Change to make to specified field */
	} xfs_mod_sb_t;

	extern int xfs_log_sbcount(xfs_mount_t *);
	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 *);
	extern int xfs_unmountfs_writesb(xfs_mount_t *);
	extern int xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
	extern int xfs_mod_incore_sb_batch(xfs_mount_t , xfs_mod_sb_t ,
	uint, int);
	extern int xfs_mount_log_sb(xfs_mount_t *, __int64_t);
	extern struct xfs_buf xfs_getsb(xfs_mount_t , int);
	extern int xfs_readsb(xfs_mount_t *, int);
	extern void xfs_freesb(xfs_mount_t *);
	extern int xfs_fs_writable(xfs_mount_t *);
	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 *);

	#endif /* __KERNEL__ */

	extern void xfs_mod_sb(struct xfs_trans *, __int64_t);
	extern int xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
	xfs_agnumber_t *);
	extern void xfs_sb_from_disk(struct xfs_mount , struct xfs_dsb );
	extern void xfs_sb_to_disk(struct xfs_dsb , struct xfs_sb , __int64_t);

	#endif /* __XFS_MOUNT_H__ */