[linux-2.6-block.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__

struct xlog;
struct xfs_inode;
struct xfs_mru_cache;
struct xfs_nameops;
struct xfs_ail;
struct xfs_quotainfo;
struct xfs_dir_ops;
struct xfs_da_geometry;

/* 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

struct xfs_error_cfg {
	struct xfs_kobj	kobj;
	int		max_retries;
	unsigned long	retry_timeout;	/* in jiffies, 0 = no timeout */
};

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 */

	struct xfs_sb		m_sb;		/* copy of fs superblock */
	spinlock_t		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 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 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 */
	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 */
	uint			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 */
	int			m_ialloc_inos;	/* inodes in inode allocation */
	int			m_ialloc_blks;	/* blocks in inode allocation */
	int			m_ialloc_min_blks;/* min blocks in sparse inode
						   * allocation */
	int			m_inoalign_mask;/* mask sb_inoalignmt if used */
	uint			m_qflags;	/* quota status flags */
	struct xfs_trans_resv	m_resv;		/* precomputed res values */
	__uint64_t		m_maxicount;	/* maximum inode count */
	__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 */
	__uint8_t		m_sectbb_log;	/* sectlog - BBSHIFT */
	const struct xfs_nameops *m_dirnameops;	/* vector of dir name ops */
	const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
	const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
	uint			m_chsize;	/* size of next field */
	atomic_t		m_active_trans;	/* number trans frozen */
	struct xfs_mru_cache	*m_filestream;  /* per-mount filestream data */
	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
	struct delayed_work	m_eofblocks_work; /* background eof blocks
						     trimming */
	bool			m_update_sb;	/* sb needs update in mount */
	int64_t			m_low_space[XFS_LOWSP_MAX];
						/* low free space thresholds */
	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 */

	struct workqueue_struct *m_buf_workqueue;
	struct workqueue_struct	*m_data_workqueue;
	struct workqueue_struct	*m_unwritten_workqueue;
	struct workqueue_struct	*m_cil_workqueue;
	struct workqueue_struct	*m_reclaim_workqueue;
	struct workqueue_struct	*m_log_workqueue;
	struct workqueue_struct *m_eofblocks_workqueue;

	/*
	 * 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;

	bool			m_fail_unmount;
#ifdef DEBUG
	/*
	 * DEBUG mode instrumentation to test and/or trigger delayed allocation
	 * block killing in the event of failed writes. When enabled, all
	 * buffered writes are forced to fail. All delalloc blocks in the range
	 * of the write (including pre-existing delalloc blocks!) are tossed as
	 * part of the write failure error handling sequence.
	 */
	bool			m_fail_writes;
#endif
} 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_UNMOUNTING	(1ULL << 1)	/* filesystem is unmounting */
#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_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_SMALL_INUMS	(1ULL << 14)	/* user wants 32bit inodes */
#define XFS_MOUNT_32BITINODES	(1ULL << 15)	/* inode32 allocator active */
#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 */

#define XFS_MOUNT_DAX		(1ULL << 62)	/* TEST ONLY! */


/*
 * 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_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_SIZE));
}

#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 */

/*
 * 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);
}

#ifdef DEBUG
static inline bool
xfs_mp_fail_writes(struct xfs_mount *mp)
{
	return mp->m_fail_writes;
}
#else
static inline bool
xfs_mp_fail_writes(struct xfs_mount *mp)
{
	return 0;
}
#endif

/*
 * Per-ag incore structure, copies of information in agf and agi, to improve the
 * performance of allocation group selection.
 */
typedef struct xfs_perag {
	struct xfs_mount *pag_mount;	/* owner filesystem */
	xfs_agnumber_t	pag_agno;	/* AG this structure belongs to */
	atomic_t	pag_ref;	/* perag reference count */
	char		pagf_init;	/* this agf's entry is initialized */
	char		pagi_init;	/* this agi's entry is initialized */
	char		pagf_metadata;	/* the agf is preferred to be metadata */
	char		pagi_inodeok;	/* The agi is ok for inodes */
	__uint8_t	pagf_levels[XFS_BTNUM_AGF];
					/* # of levels in bno & cnt btree */
	__uint32_t	pagf_flcount;	/* count of blocks in freelist */
	xfs_extlen_t	pagf_freeblks;	/* total free blocks */
	xfs_extlen_t	pagf_longest;	/* longest free space */
	__uint32_t	pagf_btreeblks;	/* # of blocks held in AGF btrees */
	xfs_agino_t	pagi_freecount;	/* number of free inodes */
	xfs_agino_t	pagi_count;	/* number of allocated inodes */

	/*
	 * Inode allocation search lookup optimisation.
	 * If the pagino matches, the search for new inodes
	 * doesn't need to search the near ones again straight away
	 */
	xfs_agino_t	pagl_pagino;
	xfs_agino_t	pagl_leftrec;
	xfs_agino_t	pagl_rightrec;
	spinlock_t	pagb_lock;	/* lock for pagb_tree */
	struct rb_root	pagb_tree;	/* ordered tree of busy extents */

	atomic_t        pagf_fstrms;    /* # of filestreams active in this AG */

	spinlock_t	pag_ici_lock;	/* incore inode cache lock */
	struct radix_tree_root pag_ici_root;	/* incore inode cache root */
	int		pag_ici_reclaimable;	/* reclaimable inodes */
	struct mutex	pag_ici_reclaim_lock;	/* serialisation point */
	unsigned long	pag_ici_reclaim_cursor;	/* reclaim restart point */

	/* buffer cache index */
	spinlock_t	pag_buf_lock;	/* lock for pag_buf_tree */
	struct rb_root	pag_buf_tree;	/* ordered tree of active buffers */

	/* for rcu-safe freeing */
	struct rcu_head	rcu_head;
	int		pagb_count;	/* pagb slots in use */
} xfs_perag_t;

extern void	xfs_uuid_table_free(void);
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 int	xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
				     xfs_agnumber_t *maxagi);
extern void	xfs_unmountfs(xfs_mount_t *);

extern int	xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
extern int	xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
extern int	xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
				 bool reserved);
extern int	xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);

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 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);

#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
ad223e60	21	struct xlog;
1da177e4	22	struct xfs_inode;
2a82b8be	23	struct xfs_mru_cache;
5163f95a	24	struct xfs_nameops;
82fa9012	25	struct xfs_ail;
7d095257	26	struct xfs_quotainfo;
32c5483a	27	struct xfs_dir_ops;
0650b554	28	struct xfs_da_geometry;
7d095257	29
055388a3 DC	30	/* dynamic preallocation free space thresholds, 5% down to 1% */
	31	enum {
	32	XFS_LOWSP_1_PCNT = 0,
	33	XFS_LOWSP_2_PCNT,
	34	XFS_LOWSP_3_PCNT,
	35	XFS_LOWSP_4_PCNT,
	36	XFS_LOWSP_5_PCNT,
	37	XFS_LOWSP_MAX,
	38	};
	39
192852be CM	40	/*
	41	* Error Configuration
	42	*
	43	* Error classes define the subsystem the configuration belongs to.
	44	* Error numbers define the errors that are configurable.
	45	*/
	46	enum {
ffd40ef6	47	XFS_ERR_METADATA,
192852be CM	48	XFS_ERR_CLASS_MAX,
	49	};
	50	enum {
ffd40ef6	51	XFS_ERR_DEFAULT,
e0a431b3 CM	52	XFS_ERR_EIO,
	53	XFS_ERR_ENOSPC,
	54	XFS_ERR_ENODEV,
192852be CM	55	XFS_ERR_ERRNO_MAX,
	56	};
	57
a5ea70d2 CM	58	#define XFS_ERR_RETRY_FOREVER -1
a5ea70d2 CM	59
192852be CM	60	struct xfs_error_cfg {
	61	struct xfs_kobj kobj;
	62	int max_retries;
a5ea70d2	63	unsigned long retry_timeout; /* in jiffies, 0 = no timeout */
192852be CM	64	};
192852be CM	65
1da177e4	66	typedef struct xfs_mount {
b267ce99	67	struct super_block *m_super;
1da177e4	68	xfs_tid_t m_tid; /* next unused tid for fs */
82fa9012	69	struct xfs_ail m_ail; / fs active log item list */
501ab323 DC	70
501ab323 DC	71	struct xfs_sb m_sb; /* copy of fs superblock */
3685c2a1	72	spinlock_t m_sb_lock; /* sb counter lock */
501ab323	73	struct percpu_counter m_icount; /* allocated inodes counter */
e88b64ea	74	struct percpu_counter m_ifree; /* free inodes counter */
0d485ada	75	struct percpu_counter m_fdblocks; /* free block counter */
501ab323	76
1da177e4 LT	77	struct xfs_buf m_sb_bp; / buffer for superblock */
	78	char m_fsname; / filesystem name */
	79	int m_fsname_len; /* strlen of fs name */
fc1f8c1c NS	80	char m_rtname; / realtime device name */
fc1f8c1c NS	81	char m_logname; / external log device name */
1da177e4 LT	82	int m_bsize; /* fs logical block size */
	83	xfs_agnumber_t m_agfrotor; /* last ag where space found */
	84	xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
36e41eeb	85	spinlock_t m_agirotor_lock;/* .. and lock protecting it */
1da177e4	86	xfs_agnumber_t m_maxagi; /* highest inode alloc group */
1da177e4 LT	87	uint m_readio_log; /* min read size log bytes */
	88	uint m_readio_blocks; /* min read size blocks */
	89	uint m_writeio_log; /* min write size log bytes */
	90	uint m_writeio_blocks; /* min write size blocks */
0650b554 DC	91	struct xfs_da_geometry m_dir_geo; / directory block geometry */
0650b554 DC	92	struct xfs_da_geometry m_attr_geo; / attribute block geometry */
ad223e60	93	struct xlog m_log; / log specific stuff */
1da177e4 LT	94	int m_logbufs; /* number of log buffers */
	95	int m_logbsize; /* size of each log buffer */
	96	uint m_rsumlevels; /* rt summary levels */
	97	uint m_rsumsize; /* size of rt summary, bytes */
	98	struct xfs_inode m_rbmip; / pointer to bitmap inode */
	99	struct xfs_inode m_rsumip; / pointer to summary inode */
	100	struct xfs_inode m_rootip; / pointer to root directory */
	101	struct xfs_quotainfo m_quotainfo; / disk quota information */
	102	xfs_buftarg_t m_ddev_targp; / saves taking the address */
	103	xfs_buftarg_t m_logdev_targp;/ ptr to log device */
	104	xfs_buftarg_t m_rtdev_targp; / ptr to rt device */
1da177e4 LT	105	__uint8_t m_blkbit_log; /* blocklog + NBBY */
	106	__uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
	107	__uint8_t m_agno_log; /* log #ag's */
	108	__uint8_t m_agino_log; /* #bits for agino in inum */
8f80587b	109	uint m_inode_cluster_size;/* min inode buf size */
1da177e4 LT	110	uint m_blockmask; /* sb_blocksize-1 */
	111	uint m_blockwsize; /* sb_blocksize in words */
	112	uint m_blockwmask; /* blockwsize-1 */
60197e8d CH	113	uint m_alloc_mxr[2]; /* max alloc btree records */
	114	uint m_alloc_mnr[2]; /* min alloc btree records */
	115	uint m_bmap_dmxr[2]; /* max bmap btree records */
	116	uint m_bmap_dmnr[2]; /* min bmap btree records */
	117	uint m_inobt_mxr[2]; /* max inobt btree records */
	118	uint m_inobt_mnr[2]; /* min inobt btree records */
1da177e4 LT	119	uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
1da177e4 LT	120	uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
0d87e656	121	uint m_in_maxlevels; /* max inobt btree levels. */
1c1c6ebc DC	122	struct radix_tree_root m_perag_tree; /* per-ag accounting info */
1c1c6ebc DC	123	spinlock_t m_perag_lock; /* lock for m_perag_tree */
cc92e7ac	124	struct mutex m_growlock; /* growfs mutex */
1da177e4 LT	125	int m_fixedfsid[2]; /* unchanged for life of FS */
1da177e4 LT	126	uint m_dmevmask; /* DMI events for this FS */
e718eeb4	127	__uint64_t m_flags; /* global mount flags */
1da177e4 LT	128	int m_ialloc_inos; /* inodes in inode allocation */
1da177e4 LT	129	int m_ialloc_blks; /* blocks in inode allocation */
066a1884 BF	130	int m_ialloc_min_blks;/* min blocks in sparse inode
066a1884 BF	131	* allocation */
1da177e4 LT	132	int m_inoalign_mask;/* mask sb_inoalignmt if used */
1da177e4 LT	133	uint m_qflags; /* quota status flags */
0eadd102	134	struct xfs_trans_resv m_resv; /* precomputed res values */
1da177e4	135	__uint64_t m_maxicount; /* maximum inode count */
1da177e4 LT	136	__uint64_t m_resblks; /* total reserved blocks */
1da177e4 LT	137	__uint64_t m_resblks_avail;/* available reserved blocks */
cbe132a8	138	__uint64_t m_resblks_save; /* reserved blks @ remount,ro */
1da177e4 LT	139	int m_dalign; /* stripe unit */
1da177e4 LT	140	int m_swidth; /* stripe width */
c41564b5	141	int m_sinoalign; /* stripe unit inode alignment */
1da177e4	142	__uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
5163f95a	143	const struct xfs_nameops m_dirnameops; / vector of dir name ops */
32c5483a	144	const struct xfs_dir_ops m_dir_inode_ops; / vector of dir inode ops */
4bceb18f	145	const struct xfs_dir_ops m_nondir_inode_ops; / !dir inode ops */
1da177e4	146	uint m_chsize; /* size of next field */
1da177e4	147	atomic_t m_active_trans; /* number trans frozen */
2a82b8be	148	struct xfs_mru_cache m_filestream; / per-mount filestream data */
a7b339f1	149	struct delayed_work m_reclaim_work; /* background inode reclaim */
579b62fa BF	150	struct delayed_work m_eofblocks_work; /* background eof blocks
579b62fa BF	151	trimming */
61e63ecb	152	bool m_update_sb; /* sb needs update in mount */
055388a3 DC	153	int64_t m_low_space[XFS_LOWSP_MAX];
055388a3 DC	154	/* low free space thresholds */
a31b1d3d	155	struct xfs_kobj m_kobj;
192852be	156	struct xfs_kobj m_error_kobj;
ffd40ef6	157	struct xfs_kobj m_error_meta_kobj;
192852be	158	struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
225e4635	159	struct xstats m_stats; /* per-fs stats */
aa6bf01d	160
78c931b8	161	struct workqueue_struct *m_buf_workqueue;
aa6bf01d CH	162	struct workqueue_struct *m_data_workqueue;
aa6bf01d CH	163	struct workqueue_struct *m_unwritten_workqueue;
4c2d542f	164	struct workqueue_struct *m_cil_workqueue;
5889608d DC	165	struct workqueue_struct *m_reclaim_workqueue;
5889608d DC	166	struct workqueue_struct *m_log_workqueue;
579b62fa	167	struct workqueue_struct *m_eofblocks_workqueue;
52785112 CH	168
	169	/*
	170	* Generation of the filesysyem layout. This is incremented by each
	171	* growfs, and used by the pNFS server to ensure the client updates
	172	* its view of the block device once it gets a layout that might
	173	* reference the newly added blocks. Does not need to be persistent
	174	* as long as we only allow file system size increments, but if we
	175	* ever support shrinks it would have to be persisted in addition
	176	* to various other kinds of pain inflicted on the pNFS server.
	177	*/
	178	__uint32_t m_generation;
801cc4e1	179
e6b3bb78	180	bool m_fail_unmount;
801cc4e1 BF	181	#ifdef DEBUG
	182	/*
	183	* DEBUG mode instrumentation to test and/or trigger delayed allocation
	184	* block killing in the event of failed writes. When enabled, all
	185	* buffered writes are forced to fail. All delalloc blocks in the range
	186	* of the write (including pre-existing delalloc blocks!) are tossed as
	187	* part of the write failure error handling sequence.
	188	*/
	189	bool m_fail_writes;
	190	#endif
1da177e4 LT	191	} xfs_mount_t;
	192
	193	/*
	194	* Flags for m_flags.
	195	*/
92821e2b	196	#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
1da177e4 LT	197	must be synchronous except
1da177e4 LT	198	for space allocations */
e6b3bb78	199	#define XFS_MOUNT_UNMOUNTING (1ULL << 1) /* filesystem is unmounting */
92821e2b	200	#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
e718eeb4	201	#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
1da177e4 LT	202	operations, typically for
1da177e4 LT	203	disk errors in metadata */
e84661aa	204	#define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
e718eeb4	205	#define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
1da177e4	206	allocations */
13059ff0	207	#define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
bd186aa9	208	#define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
e718eeb4	209	#define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
e718eeb4	210	#define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
12c3f05c ES	211	#define XFS_MOUNT_SMALL_INUMS (1ULL << 14) /* user wants 32bit inodes */
12c3f05c ES	212	#define XFS_MOUNT_32BITINODES (1ULL << 15) /* inode32 allocator active */
e718eeb4 NS	213	#define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
e718eeb4 NS	214	#define XFS_MOUNT_BARRIER (1ULL << 17)
1bd960ee	215	#define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
e718eeb4	216	#define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
1da177e4	217	* allocation */
bd186aa9	218	#define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
e718eeb4 NS	219	#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
e718eeb4 NS	220	#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
e8c8b3a7	221	* I/O size in stat() */
2a82b8be DC	222	#define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
2a82b8be DC	223	allocator */
7c12f296	224	#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
e8c8b3a7	225
cbe4dab1 DC	226	#define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */
cbe4dab1 DC	227
1da177e4 LT	228
	229	/*
	230	* Default minimum read and write sizes.
	231	*/
	232	#define XFS_READIO_LOG_LARGE 16
	233	#define XFS_WRITEIO_LOG_LARGE 16
	234
	235	/*
1f443ad7 NS	236	* Max and min values for mount-option defined I/O
1f443ad7 NS	237	* preallocation sizes.
1da177e4	238	*/
1f443ad7	239	#define XFS_MAX_IO_LOG 30 /* 1G */
1da177e4 LT	240	#define XFS_MIN_IO_LOG PAGE_SHIFT
	241
	242	/*
	243	* Synchronous read and write sizes. This should be
	244	* better for NFSv2 wsync filesystems.
	245	*/
9da096fd MP	246	#define XFS_WSYNC_READIO_LOG 15 /* 32k */
9da096fd MP	247	#define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
1da177e4	248
e8c8b3a7 DC	249	/*
e8c8b3a7 DC	250	* Allow large block sizes to be reported to userspace programs if the
556b8b16	251	* "largeio" mount option is used.
e8c8b3a7 DC	252	*
	253	* If compatibility mode is specified, simply return the basic unit of caching
	254	* so that we don't get inefficient read/modify/write I/O from user apps.
	255	* Otherwise....
	256	*
	257	* If the underlying volume is a stripe, then return the stripe width in bytes
	258	* as the recommended I/O size. It is not a stripe and we've set a default
	259	* buffered I/O size, return that, otherwise return the compat default.
	260	*/
	261	static inline unsigned long
	262	xfs_preferred_iosize(xfs_mount_t *mp)
	263	{
	264	if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
09cbfeaf	265	return PAGE_SIZE;
e8c8b3a7 DC	266	return (mp->m_swidth ?
	267	(mp->m_swidth << mp->m_sb.sb_blocklog) :
	268	((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
	269	(1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
09cbfeaf	270	PAGE_SIZE));
e8c8b3a7 DC	271	}
e8c8b3a7 DC	272
92821e2b DC	273	#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
92821e2b DC	274	((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
1da177e4	275	#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
745f6919 CH	276	void xfs_do_force_shutdown(struct xfs_mount mp, int flags, char fname,
745f6919 CH	277	int lnnum);
1da177e4	278	#define xfs_force_shutdown(m,f) \
745f6919	279	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
1da177e4	280
2b5decd0 CH	281	#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
	282	#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
	283	#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
	284	#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
	285	#define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
	286	#define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
	287
1da177e4 LT	288	/*
	289	* Flags for xfs_mountfs
	290	*/
764d1f89	291	#define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
1da177e4	292
a844f451 NS	293	static inline xfs_agnumber_t
a844f451 NS	294	xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
1da177e4	295	{
a844f451 NS	296	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
	297	do_div(ld, mp->m_sb.sb_agblocks);
	298	return (xfs_agnumber_t) ld;
1da177e4 LT	299	}
1da177e4 LT	300
a844f451 NS	301	static inline xfs_agblock_t
a844f451 NS	302	xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
1da177e4	303	{
a844f451 NS	304	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
a844f451 NS	305	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
1da177e4 LT	306	}
1da177e4 LT	307
801cc4e1 BF	308	#ifdef DEBUG
	309	static inline bool
	310	xfs_mp_fail_writes(struct xfs_mount *mp)
	311	{
	312	return mp->m_fail_writes;
	313	}
	314	#else
	315	static inline bool
	316	xfs_mp_fail_writes(struct xfs_mount *mp)
	317	{
	318	return 0;
	319	}
	320	#endif
	321
9356fe22 DC	322	/*
9356fe22 DC	323	* Per-ag incore structure, copies of information in agf and agi, to improve the
4fb6e8ad	324	* performance of allocation group selection.
9356fe22 DC	325	*/
	326	typedef struct xfs_perag {
	327	struct xfs_mount pag_mount; / owner filesystem */
	328	xfs_agnumber_t pag_agno; /* AG this structure belongs to */
	329	atomic_t pag_ref; /* perag reference count */
	330	char pagf_init; /* this agf's entry is initialized */
	331	char pagi_init; /* this agi's entry is initialized */
	332	char pagf_metadata; /* the agf is preferred to be metadata */
	333	char pagi_inodeok; /* The agi is ok for inodes */
	334	__uint8_t pagf_levels[XFS_BTNUM_AGF];
	335	/* # of levels in bno & cnt btree */
	336	__uint32_t pagf_flcount; /* count of blocks in freelist */
	337	xfs_extlen_t pagf_freeblks; /* total free blocks */
	338	xfs_extlen_t pagf_longest; /* longest free space */
	339	__uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
	340	xfs_agino_t pagi_freecount; /* number of free inodes */
	341	xfs_agino_t pagi_count; /* number of allocated inodes */
	342
	343	/*
	344	* Inode allocation search lookup optimisation.
	345	* If the pagino matches, the search for new inodes
	346	* doesn't need to search the near ones again straight away
	347	*/
	348	xfs_agino_t pagl_pagino;
	349	xfs_agino_t pagl_leftrec;
	350	xfs_agino_t pagl_rightrec;
	351	spinlock_t pagb_lock; /* lock for pagb_tree */
	352	struct rb_root pagb_tree; /* ordered tree of busy extents */
	353
	354	atomic_t pagf_fstrms; /* # of filestreams active in this AG */
	355
	356	spinlock_t pag_ici_lock; /* incore inode cache lock */
	357	struct radix_tree_root pag_ici_root; /* incore inode cache root */
	358	int pag_ici_reclaimable; /* reclaimable inodes */
	359	struct mutex pag_ici_reclaim_lock; /* serialisation point */
	360	unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
	361
	362	/* buffer cache index */
	363	spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
	364	struct rb_root pag_buf_tree; /* ordered tree of active buffers */
	365
	366	/* for rcu-safe freeing */
	367	struct rcu_head rcu_head;
	368	int pagb_count; /* pagb slots in use */
	369	} xfs_perag_t;
	370
af3b6382	371	extern void xfs_uuid_table_free(void);
adab0f67	372	extern int xfs_log_sbcount(xfs_mount_t *);
d5db0f97	373	extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
4249023a	374	extern int xfs_mountfs(xfs_mount_t *mp);
ff55068c DC	375	extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
ff55068c DC	376	xfs_agnumber_t *maxagi);
41b5c2e7	377	extern void xfs_unmountfs(xfs_mount_t *);
964aa8d9	378
501ab323	379	extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
e88b64ea	380	extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
0d485ada DC	381	extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
0d485ada DC	382	bool reserved);
bab98bbe DC	383	extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
bab98bbe DC	384
1da177e4	385	extern struct xfs_buf xfs_getsb(xfs_mount_t , int);
764d1f89	386	extern int xfs_readsb(xfs_mount_t *, int);
1da177e4	387	extern void xfs_freesb(xfs_mount_t *);
91ee575f	388	extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
4cc929ee	389	extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
1da177e4	390
d7658d48 CH	391	extern int xfs_dev_is_read_only(struct xfs_mount , char );
d7658d48 CH	392
055388a3 DC	393	extern void xfs_set_low_space_thresholds(struct xfs_mount *);
055388a3 DC	394
3fbbbea3 DC	395	int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
	396	xfs_off_t count_fsb);
	397
df309390 CM	398	struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
	399	int error_class, int error);
	400
1da177e4	401	#endif /* __XFS_MOUNT_H__ */