[people/ms/linux.git] / fs / xfs / 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__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	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.
1da177e4	13	*
7b718769 NS	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
1da177e4 LT	17	*/
	18	#ifndef __XFS_MOUNT_H__
	19	#define __XFS_MOUNT_H__
	20
1da177e4 LT	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
1da177e4	45	#ifndef __KERNEL__
847fff5c	46
9d87c319	47	#define xfs_daddr_to_agno(mp,d) \
1da177e4	48	((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
9d87c319	49	#define xfs_daddr_to_agbno(mp,d) \
1da177e4	50	((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))
847fff5c BN	51
	52	#else /* __KERNEL__ */
	53
6d73cf13 CH	54	#include "xfs_sync.h"
6d73cf13 CH	55
1da177e4	56	struct log;
1da177e4	57	struct xfs_mount_args;
1da177e4	58	struct xfs_inode;
1da177e4 LT	59	struct xfs_bmbt_irec;
1da177e4 LT	60	struct xfs_bmap_free;
3e57ecf6 OW	61	struct xfs_extdelta;
3e57ecf6 OW	62	struct xfs_swapext;
2a82b8be	63	struct xfs_mru_cache;
5163f95a	64	struct xfs_nameops;
82fa9012	65	struct xfs_ail;
7d095257 CH	66	struct xfs_quotainfo;
7d095257 CH	67
8d280b98 DC	68	#ifdef HAVE_PERCPU_SB
	69
	70	/*
	71	* Valid per-cpu incore superblock counters. Note that if you add new counters,
	72	* you may need to define new counter disabled bit field descriptors as there
	73	* are more possible fields in the superblock that can fit in a bitfield on a
	74	* 32 bit platform. The XFS_SBS_* values for the current current counters just
	75	* fit.
	76	*/
	77	typedef struct xfs_icsb_cnts {
	78	uint64_t icsb_fdblocks;
	79	uint64_t icsb_ifree;
	80	uint64_t icsb_icount;
01e1b69c	81	unsigned long icsb_flags;
8d280b98 DC	82	} xfs_icsb_cnts_t;
8d280b98 DC	83
01e1b69c DC	84	#define XFS_ICSB_FLAG_LOCK (1 << 0) /* counter lock bit */
01e1b69c DC	85
8d280b98 DC	86	#define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */
	87
	88	extern int xfs_icsb_init_counters(struct xfs_mount *);
5478eead	89	extern void xfs_icsb_reinit_counters(struct xfs_mount *);
c962fb79	90	extern void xfs_icsb_destroy_counters(struct xfs_mount *);
d4d90b57 CH	91	extern void xfs_icsb_sync_counters(struct xfs_mount *, int);
d4d90b57 CH	92	extern void xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
96540c78 CH	93	extern int xfs_icsb_modify_counters(struct xfs_mount *, xfs_sb_field_t,
96540c78 CH	94	int64_t, int);
8d280b98 DC	95
8d280b98 DC	96	#else
c962fb79 CH	97	#define xfs_icsb_init_counters(mp) (0)
	98	#define xfs_icsb_destroy_counters(mp) do { } while (0)
	99	#define xfs_icsb_reinit_counters(mp) do { } while (0)
d4d90b57	100	#define xfs_icsb_sync_counters(mp, flags) do { } while (0)
7155054c	101	#define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
96540c78 CH	102	#define xfs_icsb_modify_counters(mp, field, delta, rsvd) \
96540c78 CH	103	xfs_mod_incore_sb(mp, field, delta, rsvd)
8d280b98	104	#endif
1da177e4	105
055388a3 DC	106	/* dynamic preallocation free space thresholds, 5% down to 1% */
	107	enum {
	108	XFS_LOWSP_1_PCNT = 0,
	109	XFS_LOWSP_2_PCNT,
	110	XFS_LOWSP_3_PCNT,
	111	XFS_LOWSP_4_PCNT,
	112	XFS_LOWSP_5_PCNT,
	113	XFS_LOWSP_MAX,
	114	};
	115
1da177e4	116	typedef struct xfs_mount {
b267ce99	117	struct super_block *m_super;
1da177e4	118	xfs_tid_t m_tid; /* next unused tid for fs */
82fa9012	119	struct xfs_ail m_ail; / fs active log item list */
1da177e4	120	xfs_sb_t m_sb; /* copy of fs superblock */
3685c2a1	121	spinlock_t m_sb_lock; /* sb counter lock */
1da177e4 LT	122	struct xfs_buf m_sb_bp; / buffer for superblock */
	123	char m_fsname; / filesystem name */
	124	int m_fsname_len; /* strlen of fs name */
fc1f8c1c NS	125	char m_rtname; / realtime device name */
fc1f8c1c NS	126	char m_logname; / external log device name */
1da177e4 LT	127	int m_bsize; /* fs logical block size */
	128	xfs_agnumber_t m_agfrotor; /* last ag where space found */
	129	xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
36e41eeb	130	spinlock_t m_agirotor_lock;/* .. and lock protecting it */
1da177e4	131	xfs_agnumber_t m_maxagi; /* highest inode alloc group */
1da177e4 LT	132	uint m_readio_log; /* min read size log bytes */
	133	uint m_readio_blocks; /* min read size blocks */
	134	uint m_writeio_log; /* min write size log bytes */
	135	uint m_writeio_blocks; /* min write size blocks */
	136	struct log m_log; / log specific stuff */
	137	int m_logbufs; /* number of log buffers */
	138	int m_logbsize; /* size of each log buffer */
	139	uint m_rsumlevels; /* rt summary levels */
	140	uint m_rsumsize; /* size of rt summary, bytes */
	141	struct xfs_inode m_rbmip; / pointer to bitmap inode */
	142	struct xfs_inode m_rsumip; / pointer to summary inode */
	143	struct xfs_inode m_rootip; / pointer to root directory */
	144	struct xfs_quotainfo m_quotainfo; / disk quota information */
	145	xfs_buftarg_t m_ddev_targp; / saves taking the address */
	146	xfs_buftarg_t m_logdev_targp;/ ptr to log device */
	147	xfs_buftarg_t m_rtdev_targp; / ptr to rt device */
1da177e4 LT	148	__uint8_t m_blkbit_log; /* blocklog + NBBY */
	149	__uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
	150	__uint8_t m_agno_log; /* log #ag's */
	151	__uint8_t m_agino_log; /* #bits for agino in inum */
1da177e4 LT	152	__uint16_t m_inode_cluster_size;/* min inode buf size */
	153	uint m_blockmask; /* sb_blocksize-1 */
	154	uint m_blockwsize; /* sb_blocksize in words */
	155	uint m_blockwmask; /* blockwsize-1 */
60197e8d CH	156	uint m_alloc_mxr[2]; /* max alloc btree records */
	157	uint m_alloc_mnr[2]; /* min alloc btree records */
	158	uint m_bmap_dmxr[2]; /* max bmap btree records */
	159	uint m_bmap_dmnr[2]; /* min bmap btree records */
	160	uint m_inobt_mxr[2]; /* max inobt btree records */
	161	uint m_inobt_mnr[2]; /* min inobt btree records */
1da177e4 LT	162	uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
1da177e4 LT	163	uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
0d87e656	164	uint m_in_maxlevels; /* max inobt btree levels. */
1c1c6ebc DC	165	struct radix_tree_root m_perag_tree; /* per-ag accounting info */
1c1c6ebc DC	166	spinlock_t m_perag_lock; /* lock for m_perag_tree */
cc92e7ac	167	struct mutex m_growlock; /* growfs mutex */
1da177e4 LT	168	int m_fixedfsid[2]; /* unchanged for life of FS */
1da177e4 LT	169	uint m_dmevmask; /* DMI events for this FS */
e718eeb4	170	__uint64_t m_flags; /* global mount flags */
1da177e4 LT	171	uint m_dir_node_ents; /* #entries in a dir danode */
	172	uint m_attr_node_ents; /* #entries in attr danode */
	173	int m_ialloc_inos; /* inodes in inode allocation */
	174	int m_ialloc_blks; /* blocks in inode allocation */
1da177e4 LT	175	int m_inoalign_mask;/* mask sb_inoalignmt if used */
	176	uint m_qflags; /* quota status flags */
	177	xfs_trans_reservations_t m_reservations;/* precomputed res values */
	178	__uint64_t m_maxicount; /* maximum inode count */
	179	__uint64_t m_maxioffset; /* maximum inode offset */
	180	__uint64_t m_resblks; /* total reserved blocks */
	181	__uint64_t m_resblks_avail;/* available reserved blocks */
cbe132a8	182	__uint64_t m_resblks_save; /* reserved blks @ remount,ro */
1da177e4 LT	183	int m_dalign; /* stripe unit */
1da177e4 LT	184	int m_swidth; /* stripe width */
c41564b5	185	int m_sinoalign; /* stripe unit inode alignment */
1da177e4 LT	186	int m_attr_magicpct;/* 37% of the blocksize */
1da177e4 LT	187	int m_dir_magicpct; /* 37% of the dir blocksize */
1da177e4	188	__uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
5163f95a	189	const struct xfs_nameops m_dirnameops; / vector of dir name ops */
1da177e4 LT	190	int m_dirblksize; /* directory block sz--bytes */
	191	int m_dirblkfsbs; /* directory block sz--fsbs */
	192	xfs_dablk_t m_dirdatablk; /* blockno of dir data v2 */
	193	xfs_dablk_t m_dirleafblk; /* blockno of dir non-data v2 */
	194	xfs_dablk_t m_dirfreeblk; /* blockno of dirfreeindex v2 */
	195	uint m_chsize; /* size of next field */
	196	struct xfs_chash m_chash; / fs private inode per-cluster
	197	* hash table */
1da177e4	198	atomic_t m_active_trans; /* number trans frozen */
8d280b98	199	#ifdef HAVE_PERCPU_SB
003cb608	200	xfs_icsb_cnts_t __percpu m_sb_cnts; / per-cpu superblock counters */
8d280b98	201	unsigned long m_icsb_counters; /* disabled per-cpu counters */
e8234a68	202	struct notifier_block m_icsb_notifier; /* hotplug cpu notifier */
20b64285	203	struct mutex m_icsb_mutex; /* balancer sync lock */
8d280b98	204	#endif
2a82b8be	205	struct xfs_mru_cache m_filestream; / per-mount filestream data */
c6d09b66	206	struct delayed_work m_sync_work; /* background sync work */
a7b339f1	207	struct delayed_work m_reclaim_work; /* background inode reclaim */
89e4cb55	208	struct work_struct m_flush_work; /* background inode flush */
7884bc86 CH	209	__int64_t m_update_flags; /* sb flags we need to update
7884bc86 CH	210	on the next remount,rw */
70e60ce7	211	struct shrinker m_inode_shrink; /* inode reclaim shrinker */
055388a3 DC	212	int64_t m_low_space[XFS_LOWSP_MAX];
055388a3 DC	213	/* low free space thresholds */
1da177e4 LT	214	} xfs_mount_t;
	215
	216	/*
	217	* Flags for m_flags.
	218	*/
92821e2b	219	#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
1da177e4 LT	220	must be synchronous except
1da177e4 LT	221	for space allocations */
92821e2b	222	#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
e718eeb4	223	#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
1da177e4 LT	224	operations, typically for
1da177e4 LT	225	disk errors in metadata */
e84661aa	226	#define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
e718eeb4	227	#define XFS_MOUNT_RETERR (1ULL << 6) /* return alignment errors to
1da177e4	228	user */
e718eeb4	229	#define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
1da177e4	230	allocations */
13059ff0	231	#define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
bd186aa9	232	#define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
e718eeb4	233	#define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
e718eeb4	234	#define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
e718eeb4	235	#define XFS_MOUNT_32BITINODES (1ULL << 14) /* do not create inodes above
1da177e4	236	* 32 bits in size */
bd186aa9	237	#define XFS_MOUNT_SMALL_INUMS (1ULL << 15) /* users wants 32bit inodes */
e718eeb4 NS	238	#define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
e718eeb4 NS	239	#define XFS_MOUNT_BARRIER (1ULL << 17)
1bd960ee	240	#define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
e718eeb4	241	#define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
1da177e4	242	* allocation */
bd186aa9	243	#define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
e718eeb4 NS	244	#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
e718eeb4 NS	245	#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
e8c8b3a7	246	* I/O size in stat() */
2a82b8be DC	247	#define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
2a82b8be DC	248	allocator */
7c12f296	249	#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
e8c8b3a7	250
1da177e4 LT	251
	252	/*
	253	* Default minimum read and write sizes.
	254	*/
	255	#define XFS_READIO_LOG_LARGE 16
	256	#define XFS_WRITEIO_LOG_LARGE 16
	257
	258	/*
1f443ad7 NS	259	* Max and min values for mount-option defined I/O
1f443ad7 NS	260	* preallocation sizes.
1da177e4	261	*/
1f443ad7	262	#define XFS_MAX_IO_LOG 30 /* 1G */
1da177e4 LT	263	#define XFS_MIN_IO_LOG PAGE_SHIFT
	264
	265	/*
	266	* Synchronous read and write sizes. This should be
	267	* better for NFSv2 wsync filesystems.
	268	*/
9da096fd MP	269	#define XFS_WSYNC_READIO_LOG 15 /* 32k */
9da096fd MP	270	#define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
1da177e4	271
e8c8b3a7 DC	272	/*
e8c8b3a7 DC	273	* Allow large block sizes to be reported to userspace programs if the
556b8b16	274	* "largeio" mount option is used.
e8c8b3a7 DC	275	*
	276	* If compatibility mode is specified, simply return the basic unit of caching
	277	* so that we don't get inefficient read/modify/write I/O from user apps.
	278	* Otherwise....
	279	*
	280	* If the underlying volume is a stripe, then return the stripe width in bytes
	281	* as the recommended I/O size. It is not a stripe and we've set a default
	282	* buffered I/O size, return that, otherwise return the compat default.
	283	*/
	284	static inline unsigned long
	285	xfs_preferred_iosize(xfs_mount_t *mp)
	286	{
	287	if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
	288	return PAGE_CACHE_SIZE;
	289	return (mp->m_swidth ?
	290	(mp->m_swidth << mp->m_sb.sb_blocklog) :
	291	((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
	292	(1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
	293	PAGE_CACHE_SIZE));
	294	}
	295
1da177e4 LT	296	#define XFS_MAXIOFFSET(mp) ((mp)->m_maxioffset)
1da177e4 LT	297
92821e2b DC	298	#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
92821e2b DC	299	((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
1da177e4	300	#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
745f6919 CH	301	void xfs_do_force_shutdown(struct xfs_mount mp, int flags, char fname,
745f6919 CH	302	int lnnum);
1da177e4	303	#define xfs_force_shutdown(m,f) \
745f6919	304	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
1da177e4	305
2b5decd0 CH	306	#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
	307	#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
	308	#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
	309	#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
	310	#define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
	311	#define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
	312
	313	#define xfs_test_for_freeze(mp) ((mp)->m_super->s_frozen)
	314	#define xfs_wait_for_freeze(mp,l) vfs_check_frozen((mp)->m_super, (l))
	315
1da177e4 LT	316	/*
	317	* Flags for xfs_mountfs
	318	*/
764d1f89	319	#define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
1da177e4	320
a844f451 NS	321	static inline xfs_agnumber_t
a844f451 NS	322	xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
1da177e4	323	{
a844f451 NS	324	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
	325	do_div(ld, mp->m_sb.sb_agblocks);
	326	return (xfs_agnumber_t) ld;
1da177e4 LT	327	}
1da177e4 LT	328
a844f451 NS	329	static inline xfs_agblock_t
a844f451 NS	330	xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
1da177e4	331	{
a844f451 NS	332	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
a844f451 NS	333	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
1da177e4 LT	334	}
1da177e4 LT	335
da353b0d	336	/*
aed3bb90	337	* perag get/put wrappers for ref counting
da353b0d	338	*/
0fa800fb	339	struct xfs_perag xfs_perag_get(struct xfs_mount mp, xfs_agnumber_t agno);
65d0f205 DC	340	struct xfs_perag xfs_perag_get_tag(struct xfs_mount mp, xfs_agnumber_t agno,
65d0f205 DC	341	int tag);
0fa800fb	342	void xfs_perag_put(struct xfs_perag *pag);
da353b0d	343
03135cf7 DC	344	/*
	345	* Per-cpu superblock locking functions
	346	*/
	347	#ifdef HAVE_PERCPU_SB
b8f82a4a	348	static inline void
03135cf7 DC	349	xfs_icsb_lock(xfs_mount_t *mp)
	350	{
	351	mutex_lock(&mp->m_icsb_mutex);
	352	}
	353
b8f82a4a	354	static inline void
03135cf7 DC	355	xfs_icsb_unlock(xfs_mount_t *mp)
	356	{
	357	mutex_unlock(&mp->m_icsb_mutex);
	358	}
	359	#else
	360	#define xfs_icsb_lock(mp)
	361	#define xfs_icsb_unlock(mp)
	362	#endif
	363
1da177e4 LT	364	/*
1da177e4 LT	365	* This structure is for use by the xfs_mod_incore_sb_batch() routine.
20f4ebf2	366	* xfs_growfs can specify a few fields which are more than int limit
1da177e4 LT	367	*/
	368	typedef struct xfs_mod_sb {
	369	xfs_sb_field_t msb_field; /* Field to modify, see below */
20f4ebf2	370	int64_t msb_delta; /* Change to make to specified field */
1da177e4 LT	371	} xfs_mod_sb_t;
1da177e4 LT	372
adab0f67	373	extern int xfs_log_sbcount(xfs_mount_t *);
d5db0f97	374	extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
4249023a	375	extern int xfs_mountfs(xfs_mount_t *mp);
1da177e4	376
41b5c2e7	377	extern void xfs_unmountfs(xfs_mount_t *);
1da177e4	378	extern int xfs_unmountfs_writesb(xfs_mount_t *);
20f4ebf2	379	extern int xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
1da177e4 LT	380	extern int xfs_mod_incore_sb_batch(xfs_mount_t , xfs_mod_sb_t ,
1da177e4 LT	381	uint, int);
7884bc86	382	extern int xfs_mount_log_sb(xfs_mount_t *, __int64_t);
1da177e4	383	extern struct xfs_buf xfs_getsb(xfs_mount_t , int);
764d1f89	384	extern int xfs_readsb(xfs_mount_t *, int);
1da177e4	385	extern void xfs_freesb(xfs_mount_t *);
92821e2b	386	extern int xfs_fs_writable(xfs_mount_t *);
4cc929ee	387	extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
1da177e4	388
d7658d48 CH	389	extern int xfs_dev_is_read_only(struct xfs_mount , char );
d7658d48 CH	390
055388a3 DC	391	extern void xfs_set_low_space_thresholds(struct xfs_mount *);
055388a3 DC	392
1da177e4 LT	393	#endif /* __KERNEL__ */
1da177e4 LT	394
847fff5c	395	extern void xfs_mod_sb(struct xfs_trans *, __int64_t);
1c1c6ebc DC	396	extern int xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
1c1c6ebc DC	397	xfs_agnumber_t *);
6bd92a23	398	extern void xfs_sb_from_disk(struct xfs_mount , struct xfs_dsb );
847fff5c BN	399	extern void xfs_sb_to_disk(struct xfs_dsb , struct xfs_sb , __int64_t);
847fff5c BN	400
1da177e4	401	#endif /* __XFS_MOUNT_H__ */