[linux-block.git] / fs / xfs / xfs_inode.h

/*
 * Copyright (c) 2000-2003,2005 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_INODE_H__
#define	__XFS_INODE_H__

#include "xfs_inode_buf.h"
#include "xfs_inode_fork.h"

/*
 * Kernel only inode definitions
 */

struct xfs_dinode;
struct xfs_inode;
struct xfs_buf;
struct xfs_bmap_free;
struct xfs_bmbt_irec;
struct xfs_inode_log_item;
struct xfs_mount;
struct xfs_trans;
struct xfs_dquot;

typedef struct xfs_inode {
	/* Inode linking and identification information. */
	struct xfs_mount	*i_mount;	/* fs mount struct ptr */
	struct xfs_dquot	*i_udquot;	/* user dquot */
	struct xfs_dquot	*i_gdquot;	/* group dquot */
	struct xfs_dquot	*i_pdquot;	/* project dquot */

	/* Inode location stuff */
	xfs_ino_t		i_ino;		/* inode number (agno/agino)*/
	struct xfs_imap		i_imap;		/* location for xfs_imap() */

	/* Extent information. */
	xfs_ifork_t		*i_afp;		/* attribute fork pointer */
	xfs_ifork_t		i_df;		/* data fork */

	/* Transaction and locking information. */
	struct xfs_inode_log_item *i_itemp;	/* logging information */
	mrlock_t		i_lock;		/* inode lock */
	mrlock_t		i_iolock;	/* inode IO lock */
	atomic_t		i_pincount;	/* inode pin count */
	spinlock_t		i_flags_lock;	/* inode i_flags lock */
	/* Miscellaneous state. */
	unsigned long		i_flags;	/* see defined flags below */
	unsigned int		i_delayed_blks;	/* count of delay alloc blks */

	xfs_icdinode_t		i_d;		/* most of ondisk inode */

	/* VFS inode */
	struct inode		i_vnode;	/* embedded VFS inode */
} xfs_inode_t;

/* Convert from vfs inode to xfs inode */
static inline struct xfs_inode *XFS_I(struct inode *inode)
{
	return container_of(inode, struct xfs_inode, i_vnode);
}

/* convert from xfs inode to vfs inode */
static inline struct inode *VFS_I(struct xfs_inode *ip)
{
	return &ip->i_vnode;
}

/*
 * For regular files we only update the on-disk filesize when actually
 * writing data back to disk.  Until then only the copy in the VFS inode
 * is uptodate.
 */
static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
{
	if (S_ISREG(ip->i_d.di_mode))
		return i_size_read(VFS_I(ip));
	return ip->i_d.di_size;
}

/*
 * If this I/O goes past the on-disk inode size update it unless it would
 * be past the current in-core inode size.
 */
static inline xfs_fsize_t
xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
{
	xfs_fsize_t i_size = i_size_read(VFS_I(ip));

	if (new_size > i_size)
		new_size = i_size;
	return new_size > ip->i_d.di_size ? new_size : 0;
}

/*
 * i_flags helper functions
 */
static inline void
__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
{
	ip->i_flags |= flags;
}

static inline void
xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
{
	spin_lock(&ip->i_flags_lock);
	__xfs_iflags_set(ip, flags);
	spin_unlock(&ip->i_flags_lock);
}

static inline void
xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
{
	spin_lock(&ip->i_flags_lock);
	ip->i_flags &= ~flags;
	spin_unlock(&ip->i_flags_lock);
}

static inline int
__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
{
	return (ip->i_flags & flags);
}

static inline int
xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
{
	int ret;
	spin_lock(&ip->i_flags_lock);
	ret = __xfs_iflags_test(ip, flags);
	spin_unlock(&ip->i_flags_lock);
	return ret;
}

static inline int
xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
{
	int ret;

	spin_lock(&ip->i_flags_lock);
	ret = ip->i_flags & flags;
	if (ret)
		ip->i_flags &= ~flags;
	spin_unlock(&ip->i_flags_lock);
	return ret;
}

static inline int
xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
{
	int ret;

	spin_lock(&ip->i_flags_lock);
	ret = ip->i_flags & flags;
	if (!ret)
		ip->i_flags |= flags;
	spin_unlock(&ip->i_flags_lock);
	return ret;
}

/*
 * Project quota id helpers (previously projid was 16bit only
 * and using two 16bit values to hold new 32bit projid was chosen
 * to retain compatibility with "old" filesystems).
 */
static inline prid_t
xfs_get_projid(struct xfs_inode *ip)
{
	return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
}

static inline void
xfs_set_projid(struct xfs_inode *ip,
		prid_t projid)
{
	ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
	ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
}

/*
 * In-core inode flags.
 */
#define XFS_IRECLAIM		(1 << 0) /* started reclaiming this inode */
#define XFS_ISTALE		(1 << 1) /* inode has been staled */
#define XFS_IRECLAIMABLE	(1 << 2) /* inode can be reclaimed */
#define XFS_INEW		(1 << 3) /* inode has just been allocated */
#define XFS_IFILESTREAM		(1 << 4) /* inode is in a filestream dir. */
#define XFS_ITRUNCATED		(1 << 5) /* truncated down so flush-on-close */
#define XFS_IDIRTY_RELEASE	(1 << 6) /* dirty release already seen */
#define __XFS_IFLOCK_BIT	7	 /* inode is being flushed right now */
#define XFS_IFLOCK		(1 << __XFS_IFLOCK_BIT)
#define __XFS_IPINNED_BIT	8	 /* wakeup key for zero pin count */
#define XFS_IPINNED		(1 << __XFS_IPINNED_BIT)
#define XFS_IDONTCACHE		(1 << 9) /* don't cache the inode long term */

/*
 * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 * inode lookup. This prevents unintended behaviour on the new inode from
 * ocurring.
 */
#define XFS_IRECLAIM_RESET_FLAGS	\
	(XFS_IRECLAIMABLE | XFS_IRECLAIM | \
	 XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | \
	 XFS_IFILESTREAM);

/*
 * Synchronize processes attempting to flush the in-core inode back to disk.
 */

extern void __xfs_iflock(struct xfs_inode *ip);

static inline int xfs_iflock_nowait(struct xfs_inode *ip)
{
	return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
}

static inline void xfs_iflock(struct xfs_inode *ip)
{
	if (!xfs_iflock_nowait(ip))
		__xfs_iflock(ip);
}

static inline void xfs_ifunlock(struct xfs_inode *ip)
{
	xfs_iflags_clear(ip, XFS_IFLOCK);
	smp_mb();
	wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
}

static inline int xfs_isiflocked(struct xfs_inode *ip)
{
	return xfs_iflags_test(ip, XFS_IFLOCK);
}

/*
 * Flags for inode locking.
 * Bit ranges:	1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 *		1<<16 - 1<<32-1 -- lockdep annotation (integers)
 */
#define	XFS_IOLOCK_EXCL		(1<<0)
#define	XFS_IOLOCK_SHARED	(1<<1)
#define	XFS_ILOCK_EXCL		(1<<2)
#define	XFS_ILOCK_SHARED	(1<<3)

#define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)

#define XFS_LOCK_FLAGS \
	{ XFS_IOLOCK_EXCL,	"IOLOCK_EXCL" }, \
	{ XFS_IOLOCK_SHARED,	"IOLOCK_SHARED" }, \
	{ XFS_ILOCK_EXCL,	"ILOCK_EXCL" }, \
	{ XFS_ILOCK_SHARED,	"ILOCK_SHARED" }


/*
 * Flags for lockdep annotations.
 *
 * XFS_LOCK_PARENT - for directory operations that require locking a
 * parent directory inode and a child entry inode.  The parent gets locked
 * with this flag so it gets a lockdep subclass of 1 and the child entry
 * lock will have a lockdep subclass of 0.
 *
 * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 * inodes do not participate in the normal lock order, and thus have their
 * own subclasses.
 *
 * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 * with xfs_lock_inodes().  This flag is used as the starting subclass
 * and each subsequent lock acquired will increment the subclass by one.
 * So the first lock acquired will have a lockdep subclass of 4, the
 * second lock will have a lockdep subclass of 5, and so on. It is
 * the responsibility of the class builder to shift this to the correct
 * portion of the lock_mode lockdep mask.
 */
#define XFS_LOCK_PARENT		1
#define XFS_LOCK_RTBITMAP	2
#define XFS_LOCK_RTSUM		3
#define XFS_LOCK_INUMORDER	4

#define XFS_IOLOCK_SHIFT	16
#define	XFS_IOLOCK_PARENT	(XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)

#define XFS_ILOCK_SHIFT		24
#define	XFS_ILOCK_PARENT	(XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
#define	XFS_ILOCK_RTBITMAP	(XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
#define	XFS_ILOCK_RTSUM		(XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)

#define XFS_IOLOCK_DEP_MASK	0x00ff0000
#define XFS_ILOCK_DEP_MASK	0xff000000
#define XFS_LOCK_DEP_MASK	(XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)

#define XFS_IOLOCK_DEP(flags)	(((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
#define XFS_ILOCK_DEP(flags)	(((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)

/*
 * For multiple groups support: if S_ISGID bit is set in the parent
 * directory, group of new file is set to that of the parent, and
 * new subdirectory gets S_ISGID bit from parent.
 */
#define XFS_INHERIT_GID(pip)	\
	(((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
	 ((pip)->i_d.di_mode & S_ISGID))


/*
 * xfs_inode.c prototypes.
 */
void		xfs_ilock(xfs_inode_t *, uint);
int		xfs_ilock_nowait(xfs_inode_t *, uint);
void		xfs_iunlock(xfs_inode_t *, uint);
void		xfs_ilock_demote(xfs_inode_t *, uint);
int		xfs_isilocked(xfs_inode_t *, uint);
uint		xfs_ilock_map_shared(xfs_inode_t *);
void		xfs_iunlock_map_shared(xfs_inode_t *, uint);
int		xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
			   xfs_nlink_t, xfs_dev_t, prid_t, int,
			   struct xfs_buf **, xfs_inode_t **);

uint		xfs_ip2xflags(struct xfs_inode *);
uint		xfs_dic2xflags(struct xfs_dinode *);
int		xfs_ifree(struct xfs_trans *, xfs_inode_t *,
			   struct xfs_bmap_free *);
int		xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
				      int, xfs_fsize_t);
int		xfs_iunlink(struct xfs_trans *, xfs_inode_t *);

void		xfs_iext_realloc(xfs_inode_t *, int, int);

void		xfs_iunpin_wait(xfs_inode_t *);
#define xfs_ipincount(ip)	((unsigned int) atomic_read(&ip->i_pincount))

int		xfs_iflush(struct xfs_inode *, struct xfs_buf **);
void		xfs_lock_inodes(xfs_inode_t **, int, uint);
void		xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);

xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);

#define IHOLD(ip) \
do { \
	ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
	ihold(VFS_I(ip)); \
	trace_xfs_ihold(ip, _THIS_IP_); \
} while (0)

#define IRELE(ip) \
do { \
	trace_xfs_irele(ip, _THIS_IP_); \
	iput(VFS_I(ip)); \
} while (0)

extern struct kmem_zone	*xfs_inode_zone;

#endif	/* __XFS_INODE_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2003,2005 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_INODE_H__
	19	#define __XFS_INODE_H__
	20
1fd7115e	21	#include "xfs_inode_buf.h"
5c4d97d0	22	#include "xfs_inode_fork.h"
1da177e4	23
92bfc6e7	24	/*
1fd7115e	25	* Kernel only inode definitions
92bfc6e7	26	*/
847fff5c	27
1fd7115e DC	28	struct xfs_dinode;
1fd7115e DC	29	struct xfs_inode;
847fff5c BN	30	struct xfs_buf;
	31	struct xfs_bmap_free;
	32	struct xfs_bmbt_irec;
847fff5c BN	33	struct xfs_inode_log_item;
	34	struct xfs_mount;
	35	struct xfs_trans;
	36	struct xfs_dquot;
	37
1da177e4 LT	38	typedef struct xfs_inode {
1da177e4 LT	39	/* Inode linking and identification information. */
1da177e4	40	struct xfs_mount i_mount; / fs mount struct ptr */
1da177e4 LT	41	struct xfs_dquot i_udquot; / user dquot */
1da177e4 LT	42	struct xfs_dquot i_gdquot; / group dquot */
92f8ff73	43	struct xfs_dquot i_pdquot; / project dquot */
1da177e4 LT	44
	45	/* Inode location stuff */
	46	xfs_ino_t i_ino; /* inode number (agno/agino)*/
92bfc6e7	47	struct xfs_imap i_imap; /* location for xfs_imap() */
1da177e4 LT	48
	49	/* Extent information. */
	50	xfs_ifork_t i_afp; / attribute fork pointer */
	51	xfs_ifork_t i_df; /* data fork */
	52
	53	/* Transaction and locking information. */
1da177e4 LT	54	struct xfs_inode_log_item i_itemp; / logging information */
	55	mrlock_t i_lock; /* inode lock */
	56	mrlock_t i_iolock; /* inode IO lock */
1da177e4	57	atomic_t i_pincount; /* inode pin count */
f273ab84	58	spinlock_t i_flags_lock; /* inode i_flags lock */
1da177e4	59	/* Miscellaneous state. */
49e4c70e	60	unsigned long i_flags; /* see defined flags below */
1da177e4 LT	61	unsigned int i_delayed_blks; /* count of delay alloc blks */
1da177e4 LT	62
347d1c01	63	xfs_icdinode_t i_d; /* most of ondisk inode */
1da177e4	64
bf904248 DC	65	/* VFS inode */
bf904248 DC	66	struct inode i_vnode; /* embedded VFS inode */
1da177e4 LT	67	} xfs_inode_t;
1da177e4 LT	68
01651646 DC	69	/* Convert from vfs inode to xfs inode */
	70	static inline struct xfs_inode XFS_I(struct inode inode)
	71	{
bf904248	72	return container_of(inode, struct xfs_inode, i_vnode);
01651646 DC	73	}
01651646 DC	74
01651646 DC	75	/* convert from xfs inode to vfs inode */
	76	static inline struct inode VFS_I(struct xfs_inode ip)
	77	{
bf904248	78	return &ip->i_vnode;
01651646	79	}
01651646	80
ce7ae151 CH	81	/*
	82	* For regular files we only update the on-disk filesize when actually
	83	* writing data back to disk. Until then only the copy in the VFS inode
	84	* is uptodate.
	85	*/
	86	static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
	87	{
	88	if (S_ISREG(ip->i_d.di_mode))
	89	return i_size_read(VFS_I(ip));
	90	return ip->i_d.di_size;
	91	}
	92
6923e686 CH	93	/*
	94	* If this I/O goes past the on-disk inode size update it unless it would
	95	* be past the current in-core inode size.
	96	*/
	97	static inline xfs_fsize_t
	98	xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
	99	{
	100	xfs_fsize_t i_size = i_size_read(VFS_I(ip));
	101
	102	if (new_size > i_size)
	103	new_size = i_size;
	104	return new_size > ip->i_d.di_size ? new_size : 0;
	105	}
	106
7a18c386 DC	107	/*
	108	* i_flags helper functions
	109	*/
	110	static inline void
	111	__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
	112	{
	113	ip->i_flags \|= flags;
	114	}
	115
	116	static inline void
	117	xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
	118	{
	119	spin_lock(&ip->i_flags_lock);
	120	__xfs_iflags_set(ip, flags);
	121	spin_unlock(&ip->i_flags_lock);
	122	}
	123
	124	static inline void
	125	xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
	126	{
	127	spin_lock(&ip->i_flags_lock);
	128	ip->i_flags &= ~flags;
	129	spin_unlock(&ip->i_flags_lock);
	130	}
	131
	132	static inline int
	133	__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
	134	{
	135	return (ip->i_flags & flags);
	136	}
	137
	138	static inline int
	139	xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
	140	{
	141	int ret;
	142	spin_lock(&ip->i_flags_lock);
	143	ret = __xfs_iflags_test(ip, flags);
	144	spin_unlock(&ip->i_flags_lock);
	145	return ret;
	146	}
09262b43 CH	147
	148	static inline int
	149	xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
	150	{
	151	int ret;
	152
	153	spin_lock(&ip->i_flags_lock);
	154	ret = ip->i_flags & flags;
	155	if (ret)
	156	ip->i_flags &= ~flags;
	157	spin_unlock(&ip->i_flags_lock);
	158	return ret;
	159	}
1da177e4	160
474fce06 CH	161	static inline int
	162	xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
	163	{
	164	int ret;
	165
	166	spin_lock(&ip->i_flags_lock);
	167	ret = ip->i_flags & flags;
	168	if (!ret)
	169	ip->i_flags \|= flags;
	170	spin_unlock(&ip->i_flags_lock);
	171	return ret;
	172	}
	173
6743099c AM	174	/*
6743099c AM	175	* Project quota id helpers (previously projid was 16bit only
25985edc	176	* and using two 16bit values to hold new 32bit projid was chosen
6743099c AM	177	* to retain compatibility with "old" filesystems).
	178	*/
	179	static inline prid_t
	180	xfs_get_projid(struct xfs_inode *ip)
	181	{
	182	return (prid_t)ip->i_d.di_projid_hi << 16 \| ip->i_d.di_projid_lo;
	183	}
	184
	185	static inline void
	186	xfs_set_projid(struct xfs_inode *ip,
	187	prid_t projid)
	188	{
	189	ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
	190	ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
	191	}
	192
1da177e4 LT	193	/*
	194	* In-core inode flags.
	195	*/
474fce06 CH	196	#define XFS_IRECLAIM (1 << 0) /* started reclaiming this inode */
	197	#define XFS_ISTALE (1 << 1) /* inode has been staled */
	198	#define XFS_IRECLAIMABLE (1 << 2) /* inode can be reclaimed */
	199	#define XFS_INEW (1 << 3) /* inode has just been allocated */
	200	#define XFS_IFILESTREAM (1 << 4) /* inode is in a filestream dir. */
	201	#define XFS_ITRUNCATED (1 << 5) /* truncated down so flush-on-close */
	202	#define XFS_IDIRTY_RELEASE (1 << 6) /* dirty release already seen */
	203	#define __XFS_IFLOCK_BIT 7 /* inode is being flushed right now */
	204	#define XFS_IFLOCK (1 << __XFS_IFLOCK_BIT)
f392e631 CH	205	#define __XFS_IPINNED_BIT 8 /* wakeup key for zero pin count */
f392e631 CH	206	#define XFS_IPINNED (1 << __XFS_IPINNED_BIT)
5132ba8f	207	#define XFS_IDONTCACHE (1 << 9) /* don't cache the inode long term */
1da177e4	208
778e24bb DC	209	/*
778e24bb DC	210	* Per-lifetime flags need to be reset when re-using a reclaimable inode during
5132ba8f	211	* inode lookup. This prevents unintended behaviour on the new inode from
778e24bb DC	212	* ocurring.
	213	*/
	214	#define XFS_IRECLAIM_RESET_FLAGS \
	215	(XFS_IRECLAIMABLE \| XFS_IRECLAIM \| \
	216	XFS_IDIRTY_RELEASE \| XFS_ITRUNCATED \| \
	217	XFS_IFILESTREAM);
	218
474fce06 CH	219	/*
	220	* Synchronize processes attempting to flush the in-core inode back to disk.
	221	*/
	222
	223	extern void __xfs_iflock(struct xfs_inode *ip);
	224
	225	static inline int xfs_iflock_nowait(struct xfs_inode *ip)
	226	{
	227	return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
	228	}
	229
	230	static inline void xfs_iflock(struct xfs_inode *ip)
	231	{
	232	if (!xfs_iflock_nowait(ip))
	233	__xfs_iflock(ip);
	234	}
	235
	236	static inline void xfs_ifunlock(struct xfs_inode *ip)
	237	{
	238	xfs_iflags_clear(ip, XFS_IFLOCK);
311f08ac	239	smp_mb();
474fce06 CH	240	wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
	241	}
	242
	243	static inline int xfs_isiflocked(struct xfs_inode *ip)
	244	{
	245	return xfs_iflags_test(ip, XFS_IFLOCK);
	246	}
	247
1da177e4 LT	248	/*
1da177e4 LT	249	* Flags for inode locking.
f7c66ce3 LM	250	* Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield)
f7c66ce3 LM	251	* 1<<16 - 1<<32-1 -- lockdep annotation (integers)
1da177e4	252	*/
f7c66ce3 LM	253	#define XFS_IOLOCK_EXCL (1<<0)
	254	#define XFS_IOLOCK_SHARED (1<<1)
	255	#define XFS_ILOCK_EXCL (1<<2)
	256	#define XFS_ILOCK_SHARED (1<<3)
1da177e4	257
f7c66ce3	258	#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL \| XFS_IOLOCK_SHARED \
579aa9ca	259	\| XFS_ILOCK_EXCL \| XFS_ILOCK_SHARED)
f7c66ce3	260
0b1b213f CH	261	#define XFS_LOCK_FLAGS \
	262	{ XFS_IOLOCK_EXCL, "IOLOCK_EXCL" }, \
	263	{ XFS_IOLOCK_SHARED, "IOLOCK_SHARED" }, \
	264	{ XFS_ILOCK_EXCL, "ILOCK_EXCL" }, \
5b03ff1b	265	{ XFS_ILOCK_SHARED, "ILOCK_SHARED" }
0b1b213f CH	266
0b1b213f CH	267
f7c66ce3 LM	268	/*
	269	* Flags for lockdep annotations.
	270	*
9681153b CH	271	* XFS_LOCK_PARENT - for directory operations that require locking a
	272	* parent directory inode and a child entry inode. The parent gets locked
	273	* with this flag so it gets a lockdep subclass of 1 and the child entry
	274	* lock will have a lockdep subclass of 0.
	275	*
	276	* XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
	277	* inodes do not participate in the normal lock order, and thus have their
	278	* own subclasses.
f7c66ce3	279	*
0f1145cc	280	* XFS_LOCK_INUMORDER - for locking several inodes at the some time
f7c66ce3 LM	281	* with xfs_lock_inodes(). This flag is used as the starting subclass
f7c66ce3 LM	282	* and each subsequent lock acquired will increment the subclass by one.
9681153b CH	283	* So the first lock acquired will have a lockdep subclass of 4, the
9681153b CH	284	* second lock will have a lockdep subclass of 5, and so on. It is
0f1145cc DC	285	* the responsibility of the class builder to shift this to the correct
0f1145cc DC	286	* portion of the lock_mode lockdep mask.
f7c66ce3	287	*/
0f1145cc	288	#define XFS_LOCK_PARENT 1
9681153b CH	289	#define XFS_LOCK_RTBITMAP 2
	290	#define XFS_LOCK_RTSUM 3
	291	#define XFS_LOCK_INUMORDER 4
0f1145cc	292
f7c66ce3	293	#define XFS_IOLOCK_SHIFT 16
0f1145cc	294	#define XFS_IOLOCK_PARENT (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
f7c66ce3 LM	295
f7c66ce3 LM	296	#define XFS_ILOCK_SHIFT 24
0f1145cc	297	#define XFS_ILOCK_PARENT (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
9681153b CH	298	#define XFS_ILOCK_RTBITMAP (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
9681153b CH	299	#define XFS_ILOCK_RTSUM (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
f7c66ce3 LM	300
	301	#define XFS_IOLOCK_DEP_MASK 0x00ff0000
	302	#define XFS_ILOCK_DEP_MASK 0xff000000
	303	#define XFS_LOCK_DEP_MASK (XFS_IOLOCK_DEP_MASK \| XFS_ILOCK_DEP_MASK)
	304
	305	#define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
	306	#define XFS_ILOCK_DEP(flags) (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
1da177e4	307
1da177e4 LT	308	/*
	309	* For multiple groups support: if S_ISGID bit is set in the parent
	310	* directory, group of new file is set to that of the parent, and
	311	* new subdirectory gets S_ISGID bit from parent.
	312	*/
bd186aa9 CH	313	#define XFS_INHERIT_GID(pip) \
	314	(((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) \|\| \
	315	((pip)->i_d.di_mode & S_ISGID))
1da177e4	316
33479e05	317
745b1f47	318	/*
33479e05	319	* xfs_inode.c prototypes.
745b1f47	320	*/
1da177e4 LT	321	void xfs_ilock(xfs_inode_t *, uint);
	322	int xfs_ilock_nowait(xfs_inode_t *, uint);
	323	void xfs_iunlock(xfs_inode_t *, uint);
	324	void xfs_ilock_demote(xfs_inode_t *, uint);
579aa9ca	325	int xfs_isilocked(xfs_inode_t *, uint);
1da177e4 LT	326	uint xfs_ilock_map_shared(xfs_inode_t *);
1da177e4 LT	327	void xfs_iunlock_map_shared(xfs_inode_t *, uint);
576b1d67	328	int xfs_ialloc(struct xfs_trans , xfs_inode_t , umode_t,
6743099c	329	xfs_nlink_t, xfs_dev_t, prid_t, int,
08358906	330	struct xfs_buf , xfs_inode_t );
347d1c01	331
1da177e4	332	uint xfs_ip2xflags(struct xfs_inode *);
45ba598e	333	uint xfs_dic2xflags(struct xfs_dinode *);
1da177e4 LT	334	int xfs_ifree(struct xfs_trans , xfs_inode_t ,
1da177e4 LT	335	struct xfs_bmap_free *);
8f04c47a CH	336	int xfs_itruncate_extents(struct xfs_trans *, struct xfs_inode ,
8f04c47a CH	337	int, xfs_fsize_t);
1da177e4	338	int xfs_iunlink(struct xfs_trans , xfs_inode_t );
1da177e4	339
1da177e4	340	void xfs_iext_realloc(xfs_inode_t *, int, int);
1fd7115e	341
777df5af	342	void xfs_iunpin_wait(xfs_inode_t *);
1fd7115e DC	343	#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
1fd7115e DC	344
4c46819a	345	int xfs_iflush(struct xfs_inode , struct xfs_buf *);
cfa853e4	346	void xfs_lock_inodes(xfs_inode_t **, int, uint);
e1cccd91	347	void xfs_lock_two_inodes(xfs_inode_t , xfs_inode_t , uint);
1da177e4	348
2a0ec1d9 DC	349	xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
2a0ec1d9 DC	350
5a8d0f3c CH	351	#define IHOLD(ip) \
	352	do { \
	353	ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
7de9c6ee	354	ihold(VFS_I(ip)); \
0b1b213f	355	trace_xfs_ihold(ip, _THIS_IP_); \
5a8d0f3c CH	356	} while (0)
	357
	358	#define IRELE(ip) \
	359	do { \
0b1b213f	360	trace_xfs_irele(ip, _THIS_IP_); \
5a8d0f3c CH	361	iput(VFS_I(ip)); \
	362	} while (0)
	363
1da177e4	364	extern struct kmem_zone *xfs_inode_zone;
1da177e4	365
1da177e4	366	#endif /* __XFS_INODE_H__ */