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

 /*
  * 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_defer_ops;
 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_cowfp;	/* copy on write extents */
 	xfs_ifork_t		i_df;		/* data fork */

 	/* operations vectors */
 	const struct xfs_dir_ops *d_ops;		/* directory ops vector */

 	/* Transaction and locking information. */
 	struct xfs_inode_log_item *i_itemp;	/* logging information */
 	mrlock_t		i_lock;		/* inode lock */
 	mrlock_t		i_mmaplock;	/* inode mmap 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 */

 	struct xfs_icdinode	i_d;		/* most of ondisk inode */

 	xfs_extnum_t		i_cnextents;	/* # of extents in cow fork */
 	unsigned int		i_cformat;	/* format of cow fork */

 	/* 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(VFS_I(ip)->i_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 < 0)
 		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);
 }

 static inline prid_t
 xfs_get_initial_prid(struct xfs_inode *dp)
 {
 	if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
 		return xfs_get_projid(dp);

 	return XFS_PROJID_DEFAULT;
 }

 static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
 {
 	return ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
 }

 /*
  * 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_BIT		3	 /* inode has just been allocated */
 #define XFS_INEW		(1 << __XFS_INEW_BIT)
 #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 */
 #define XFS_IEOFBLOCKS		(1 << 10)/* has the preallocblocks tag set */
 /*
  * If this unlinked inode is in the middle of recovery, don't let drop_inode
  * truncate and free the inode.  This can happen if we iget the inode during
  * log recovery to replay a bmap operation on the inode.
  */
 #define XFS_IRECOVERY		(1 << 11)

 /*
  * 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)

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

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

 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)
 {
 	ASSERT(xfs_isiflocked(ip));
 	xfs_iflags_clear(ip, XFS_IFLOCK);
 	smp_mb();
 	wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
 }

 /*
  * 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_MMAPLOCK_EXCL	(1<<4)
 #define	XFS_MMAPLOCK_SHARED	(1<<5)

 #define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
 				| XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_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" }, \
 	{ XFS_MMAPLOCK_EXCL,	"MMAPLOCK_EXCL" }, \
 	{ XFS_MMAPLOCK_SHARED,	"MMAPLOCK_SHARED" }


 /*
  * Flags for lockdep annotations.
  *
  * XFS_LOCK_PARENT - for directory operations that require locking a
  * parent directory inode and a child entry inode. IOLOCK requires nesting,
  * MMAPLOCK does not support this class, ILOCK requires a single subclass
  * to differentiate parent from child.
  *
  * 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.
  * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
  * limited to the subclasses we can represent via nesting. We need at least
  * 5 inodes nest depth for the ILOCK through rename, and we also have to support
  * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
  * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
  * 8 subclasses supported by lockdep.
  *
  * This also means we have to number the sub-classes in the lowest bits of
  * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
  * mask and we can't use bit-masking to build the subclasses. What a mess.
  *
  * Bit layout:
  *
  * Bit		Lock Region
  * 16-19	XFS_IOLOCK_SHIFT dependencies
  * 20-23	XFS_MMAPLOCK_SHIFT dependencies
  * 24-31	XFS_ILOCK_SHIFT dependencies
  *
  * IOLOCK values
  *
  * 0-3		subclass value
  * 4-7		unused
  *
  * MMAPLOCK values
  *
  * 0-3		subclass value
  * 4-7		unused
  *
  * ILOCK values
  * 0-4		subclass values
  * 5		PARENT subclass (not nestable)
  * 6		RTBITMAP subclass (not nestable)
  * 7		RTSUM subclass (not nestable)
  *
  */
 #define XFS_IOLOCK_SHIFT		16
 #define XFS_IOLOCK_MAX_SUBCLASS		3
 #define XFS_IOLOCK_DEP_MASK		0x000f0000

 #define XFS_MMAPLOCK_SHIFT		20
 #define XFS_MMAPLOCK_NUMORDER		0
 #define XFS_MMAPLOCK_MAX_SUBCLASS	3
 #define XFS_MMAPLOCK_DEP_MASK		0x00f00000

 #define XFS_ILOCK_SHIFT			24
 #define XFS_ILOCK_PARENT_VAL		5
 #define XFS_ILOCK_MAX_SUBCLASS		(XFS_ILOCK_PARENT_VAL - 1)
 #define XFS_ILOCK_RTBITMAP_VAL		6
 #define XFS_ILOCK_RTSUM_VAL		7
 #define XFS_ILOCK_DEP_MASK		0xff000000
 #define	XFS_ILOCK_PARENT		(XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
 #define	XFS_ILOCK_RTBITMAP		(XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
 #define	XFS_ILOCK_RTSUM			(XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)

 #define XFS_LOCK_SUBCLASS_MASK	(XFS_IOLOCK_DEP_MASK | \
 				 XFS_MMAPLOCK_DEP_MASK | \
 				 XFS_ILOCK_DEP_MASK)

 #define XFS_IOLOCK_DEP(flags)	(((flags) & XFS_IOLOCK_DEP_MASK) \
 					>> XFS_IOLOCK_SHIFT)
 #define XFS_MMAPLOCK_DEP(flags)	(((flags) & XFS_MMAPLOCK_DEP_MASK) \
 					>> XFS_MMAPLOCK_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) || \
 	 (VFS_I(pip)->i_mode & S_ISGID))

 int		xfs_release(struct xfs_inode *ip);
 void		xfs_inactive(struct xfs_inode *ip);
 int		xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
 			   struct xfs_inode **ipp, struct xfs_name *ci_name);
 int		xfs_create(struct xfs_inode *dp, struct xfs_name *name,
 			   umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
 int		xfs_create_tmpfile(struct xfs_inode *dp, struct dentry *dentry,
 			   umode_t mode, struct xfs_inode **ipp);
 int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 			   struct xfs_inode *ip);
 int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 			 struct xfs_name *target_name);
 int		xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
 			   struct xfs_inode *src_ip, struct xfs_inode *target_dp,
 			   struct xfs_name *target_name,
 			   struct xfs_inode *target_ip, unsigned int flags);

 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_data_map_shared(struct xfs_inode *);
 uint		xfs_ilock_attr_map_shared(struct xfs_inode *);

 uint		xfs_ip2xflags(struct xfs_inode *);
 int		xfs_ifree(struct xfs_trans *, xfs_inode_t *,
 			   struct xfs_defer_ops *);
 int		xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
 				      int, xfs_fsize_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_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);

 xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);
 xfs_extlen_t	xfs_get_cowextsz_hint(struct xfs_inode *ip);

 int		xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
 			       xfs_nlink_t, xfs_dev_t, prid_t, int,
 			       struct xfs_inode **, int *);

 /* from xfs_file.c */
 enum xfs_prealloc_flags {
 	XFS_PREALLOC_SET	= (1 << 1),
 	XFS_PREALLOC_CLEAR	= (1 << 2),
 	XFS_PREALLOC_SYNC	= (1 << 3),
 	XFS_PREALLOC_INVISIBLE	= (1 << 4),
 };

 int	xfs_update_prealloc_flags(struct xfs_inode *ip,
 				  enum xfs_prealloc_flags flags);
 int	xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
 		     xfs_fsize_t isize, bool *did_zeroing);
 int	xfs_zero_range(struct xfs_inode *ip, xfs_off_t pos, xfs_off_t count,
 		bool *did_zero);
 loff_t	__xfs_seek_hole_data(struct inode *inode, loff_t start,
 			     loff_t eof, int whence);


 /* from xfs_iops.c */
 extern void xfs_setup_inode(struct xfs_inode *ip);
 extern void xfs_setup_iops(struct xfs_inode *ip);

 /*
  * When setting up a newly allocated inode, we need to call
  * xfs_finish_inode_setup() once the inode is fully instantiated at
  * the VFS level to prevent the rest of the world seeing the inode
  * before we've completed instantiation. Otherwise we can do it
  * the moment the inode lookup is complete.
  */
 static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
 {
 	xfs_iflags_clear(ip, XFS_INEW);
 	barrier();
 	unlock_new_inode(VFS_I(ip));
 	wake_up_bit(&ip->i_flags, __XFS_INEW_BIT);
 }

 static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
 {
 	xfs_setup_inode(ip);
 	xfs_setup_iops(ip);
 	xfs_finish_inode_setup(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;

 /* The default CoW extent size hint. */
 #define XFS_DEFAULT_COWEXTSZ_HINT 32

 #endif	/* __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_defer_ops;
	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_cowfp; / copy on write extents */
	xfs_ifork_t i_df; /* data fork */

	/* operations vectors */
	const struct xfs_dir_ops d_ops; / directory ops vector */

	/* Transaction and locking information. */
	struct xfs_inode_log_item i_itemp; / logging information */
	mrlock_t i_lock; /* inode lock */
	mrlock_t i_mmaplock; /* inode mmap 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 */

	struct xfs_icdinode i_d; /* most of ondisk inode */

	xfs_extnum_t i_cnextents; /* # of extents in cow fork */
	unsigned int i_cformat; /* format of cow fork */

	/* 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(VFS_I(ip)->i_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 < 0)
	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);
	}

	static inline prid_t
	xfs_get_initial_prid(struct xfs_inode *dp)
	{
	if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
	return xfs_get_projid(dp);

	return XFS_PROJID_DEFAULT;
	}

	static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
	{
	return ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
	}

	/*
	* 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_BIT 3 /* inode has just been allocated */
	#define XFS_INEW (1 << __XFS_INEW_BIT)
	#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 */
	#define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */
	/*
	* If this unlinked inode is in the middle of recovery, don't let drop_inode
	* truncate and free the inode. This can happen if we iget the inode during
	* log recovery to replay a bmap operation on the inode.
	*/
	#define XFS_IRECOVERY (1 << 11)

	/*
	* 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)

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

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

	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)
	{
	ASSERT(xfs_isiflocked(ip));
	xfs_iflags_clear(ip, XFS_IFLOCK);
	smp_mb();
	wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
	}

	/*
	* 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_MMAPLOCK_EXCL (1<<4)
	#define XFS_MMAPLOCK_SHARED (1<<5)

	#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL \| XFS_IOLOCK_SHARED \
	\| XFS_ILOCK_EXCL \| XFS_ILOCK_SHARED \
	\| XFS_MMAPLOCK_EXCL \| XFS_MMAPLOCK_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" }, \
	{ XFS_MMAPLOCK_EXCL, "MMAPLOCK_EXCL" }, \
	{ XFS_MMAPLOCK_SHARED, "MMAPLOCK_SHARED" }


	/*
	* Flags for lockdep annotations.
	*
	* XFS_LOCK_PARENT - for directory operations that require locking a
	* parent directory inode and a child entry inode. IOLOCK requires nesting,
	* MMAPLOCK does not support this class, ILOCK requires a single subclass
	* to differentiate parent from child.
	*
	* 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.
	* However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
	* limited to the subclasses we can represent via nesting. We need at least
	* 5 inodes nest depth for the ILOCK through rename, and we also have to support
	* XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
	* and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
	* 8 subclasses supported by lockdep.
	*
	* This also means we have to number the sub-classes in the lowest bits of
	* the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
	* mask and we can't use bit-masking to build the subclasses. What a mess.
	*
	* Bit layout:
	*
	* Bit Lock Region
	* 16-19 XFS_IOLOCK_SHIFT dependencies
	* 20-23 XFS_MMAPLOCK_SHIFT dependencies
	* 24-31 XFS_ILOCK_SHIFT dependencies
	*
	* IOLOCK values
	*
	* 0-3 subclass value
	* 4-7 unused
	*
	* MMAPLOCK values
	*
	* 0-3 subclass value
	* 4-7 unused
	*
	* ILOCK values
	* 0-4 subclass values
	* 5 PARENT subclass (not nestable)
	* 6 RTBITMAP subclass (not nestable)
	* 7 RTSUM subclass (not nestable)
	*
	*/
	#define XFS_IOLOCK_SHIFT 16
	#define XFS_IOLOCK_MAX_SUBCLASS 3
	#define XFS_IOLOCK_DEP_MASK 0x000f0000

	#define XFS_MMAPLOCK_SHIFT 20
	#define XFS_MMAPLOCK_NUMORDER 0
	#define XFS_MMAPLOCK_MAX_SUBCLASS 3
	#define XFS_MMAPLOCK_DEP_MASK 0x00f00000

	#define XFS_ILOCK_SHIFT 24
	#define XFS_ILOCK_PARENT_VAL 5
	#define XFS_ILOCK_MAX_SUBCLASS (XFS_ILOCK_PARENT_VAL - 1)
	#define XFS_ILOCK_RTBITMAP_VAL 6
	#define XFS_ILOCK_RTSUM_VAL 7
	#define XFS_ILOCK_DEP_MASK 0xff000000
	#define XFS_ILOCK_PARENT (XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
	#define XFS_ILOCK_RTBITMAP (XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
	#define XFS_ILOCK_RTSUM (XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)

	#define XFS_LOCK_SUBCLASS_MASK (XFS_IOLOCK_DEP_MASK \| \
	XFS_MMAPLOCK_DEP_MASK \| \
	XFS_ILOCK_DEP_MASK)

	#define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) \
	>> XFS_IOLOCK_SHIFT)
	#define XFS_MMAPLOCK_DEP(flags) (((flags) & XFS_MMAPLOCK_DEP_MASK) \
	>> XFS_MMAPLOCK_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) \|\| \
	(VFS_I(pip)->i_mode & S_ISGID))

	int xfs_release(struct xfs_inode *ip);
	void xfs_inactive(struct xfs_inode *ip);
	int xfs_lookup(struct xfs_inode dp, struct xfs_name name,
	struct xfs_inode *ipp, struct xfs_name ci_name);
	int xfs_create(struct xfs_inode dp, struct xfs_name name,
	umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
	int xfs_create_tmpfile(struct xfs_inode dp, struct dentry dentry,
	umode_t mode, struct xfs_inode **ipp);
	int xfs_remove(struct xfs_inode dp, struct xfs_name name,
	struct xfs_inode *ip);
	int xfs_link(struct xfs_inode tdp, struct xfs_inode sip,
	struct xfs_name *target_name);
	int xfs_rename(struct xfs_inode src_dp, struct xfs_name src_name,
	struct xfs_inode src_ip, struct xfs_inode target_dp,
	struct xfs_name *target_name,
	struct xfs_inode *target_ip, unsigned int flags);

	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_data_map_shared(struct xfs_inode *);
	uint xfs_ilock_attr_map_shared(struct xfs_inode *);

	uint xfs_ip2xflags(struct xfs_inode *);
	int xfs_ifree(struct xfs_trans , xfs_inode_t ,
	struct xfs_defer_ops *);
	int xfs_itruncate_extents(struct xfs_trans *, struct xfs_inode ,
	int, xfs_fsize_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_two_inodes(xfs_inode_t , xfs_inode_t , uint);

	xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
	xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip);

	int xfs_dir_ialloc(struct xfs_trans *, struct xfs_inode , umode_t,
	xfs_nlink_t, xfs_dev_t, prid_t, int,
	struct xfs_inode *, int );

	/* from xfs_file.c */
	enum xfs_prealloc_flags {
	XFS_PREALLOC_SET = (1 << 1),
	XFS_PREALLOC_CLEAR = (1 << 2),
	XFS_PREALLOC_SYNC = (1 << 3),
	XFS_PREALLOC_INVISIBLE = (1 << 4),
	};

	int xfs_update_prealloc_flags(struct xfs_inode *ip,
	enum xfs_prealloc_flags flags);
	int xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
	xfs_fsize_t isize, bool *did_zeroing);
	int xfs_zero_range(struct xfs_inode *ip, xfs_off_t pos, xfs_off_t count,
	bool *did_zero);
	loff_t __xfs_seek_hole_data(struct inode *inode, loff_t start,
	loff_t eof, int whence);


	/* from xfs_iops.c */
	extern void xfs_setup_inode(struct xfs_inode *ip);
	extern void xfs_setup_iops(struct xfs_inode *ip);

	/*
	* When setting up a newly allocated inode, we need to call
	* xfs_finish_inode_setup() once the inode is fully instantiated at
	* the VFS level to prevent the rest of the world seeing the inode
	* before we've completed instantiation. Otherwise we can do it
	* the moment the inode lookup is complete.
	*/
	static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
	{
	xfs_iflags_clear(ip, XFS_INEW);
	barrier();
	unlock_new_inode(VFS_I(ip));
	wake_up_bit(&ip->i_flags, __XFS_INEW_BIT);
	}

	static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
	{
	xfs_setup_inode(ip);
	xfs_setup_iops(ip);
	xfs_finish_inode_setup(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;

	/* The default CoW extent size hint. */
	#define XFS_DEFAULT_COWEXTSZ_HINT 32

	#endif /* __XFS_INODE_H__ */