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Don't block pdflush when writing back inodes

When pdflush is writing back inodes, it can get stuck on inode cluster
buffers that are currently under I/O. This occurs when we write data to
multiple inodes in the same inode cluster at the same time.

Effectively, delayed allocation marks the inode dirty during the data
writeback. Hence if the inode cluster was flushed during the writeback
of the first inode, the writeback of the second inode will block waiting
for the inode cluster write to complete before writing it again for the
newly dirtied inode.

Basically, we want to avoid this from happening so we don't block
pdflush and slow down all of writeback. Hence we introduce a
non-blocking async inode flush flag that pdflush uses. If this flag is
set, we use non-blocking operations (e.g. try locks) whereever we can
to avoid blocking or extra I/O being issued.
Merge of xfs-linux-melb:xfs-kern:30501a by kenmcd.

  FLUSH_INODE flag is no longer needed when calling xfs_inode_flush().
  FLUSH_LOG flag is no longer used.

/*
 * 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_VNODE_H__
#define __XFS_VNODE_H__

struct file;
struct bhv_vattr;
struct xfs_iomap;
struct attrlist_cursor_kern;

typedef struct dentry	bhv_vname_t;
typedef __u64		bhv_vnumber_t;
typedef struct inode	bhv_vnode_t;

#define VN_ISLNK(vp)	S_ISLNK((vp)->i_mode)
#define VN_ISREG(vp)	S_ISREG((vp)->i_mode)
#define VN_ISDIR(vp)	S_ISDIR((vp)->i_mode)
#define VN_ISCHR(vp)	S_ISCHR((vp)->i_mode)
#define VN_ISBLK(vp)	S_ISBLK((vp)->i_mode)

/*
 * Vnode to Linux inode mapping.
 */
static inline bhv_vnode_t *vn_from_inode(struct inode *inode)
{
	return inode;
}
static inline struct inode *vn_to_inode(bhv_vnode_t *vnode)
{
	return vnode;
}

/*
 * Values for the vop_rwlock/rwunlock flags parameter.
 */
typedef enum bhv_vrwlock {
	VRWLOCK_NONE,
	VRWLOCK_READ,
	VRWLOCK_WRITE,
	VRWLOCK_WRITE_DIRECT,
	VRWLOCK_TRY_READ,
	VRWLOCK_TRY_WRITE
} bhv_vrwlock_t;

/*
 * Return values for xfs_inactive.  A return value of
 * VN_INACTIVE_NOCACHE implies that the file system behavior
 * has disassociated its state and bhv_desc_t from the vnode.
 */
#define	VN_INACTIVE_CACHE	0
#define	VN_INACTIVE_NOCACHE	1

/*
 * Flags for read/write calls - same values as IRIX
 */
#define IO_ISAIO	0x00001		/* don't wait for completion */
#define IO_ISDIRECT	0x00004		/* bypass page cache */
#define IO_INVIS	0x00020		/* don't update inode timestamps */

/*
 * Flags for xfs_inode_flush
 */
#define FLUSH_SYNC		1	/* wait for flush to complete	*/

/*
 * Flush/Invalidate options for vop_toss/flush/flushinval_pages.
 */
#define FI_NONE			0	/* none */
#define FI_REMAPF		1	/* Do a remapf prior to the operation */
#define FI_REMAPF_LOCKED	2	/* Do a remapf prior to the operation.
					   Prevent VM access to the pages until
					   the operation completes. */

/*
 * Vnode attributes.  va_mask indicates those attributes the caller
 * wants to set or extract.
 */
typedef struct bhv_vattr {
	int		va_mask;	/* bit-mask of attributes present */
	mode_t		va_mode;	/* file access mode and type */
	xfs_nlink_t	va_nlink;	/* number of references to file */
	uid_t		va_uid;		/* owner user id */
	gid_t		va_gid;		/* owner group id */
	xfs_ino_t	va_nodeid;	/* file id */
	xfs_off_t	va_size;	/* file size in bytes */
	u_long		va_blocksize;	/* blocksize preferred for i/o */
	struct timespec	va_atime;	/* time of last access */
	struct timespec	va_mtime;	/* time of last modification */
	struct timespec	va_ctime;	/* time file changed */
	u_int		va_gen;		/* generation number of file */
	xfs_dev_t	va_rdev;	/* device the special file represents */
	__int64_t	va_nblocks;	/* number of blocks allocated */
	u_long		va_xflags;	/* random extended file flags */
	u_long		va_extsize;	/* file extent size */
	u_long		va_nextents;	/* number of extents in file */
	u_long		va_anextents;	/* number of attr extents in file */
	prid_t		va_projid;	/* project id */
} bhv_vattr_t;

/*
 * setattr or getattr attributes
 */
#define XFS_AT_TYPE		0x00000001
#define XFS_AT_MODE		0x00000002
#define XFS_AT_UID		0x00000004
#define XFS_AT_GID		0x00000008
#define XFS_AT_FSID		0x00000010
#define XFS_AT_NODEID		0x00000020
#define XFS_AT_NLINK		0x00000040
#define XFS_AT_SIZE		0x00000080
#define XFS_AT_ATIME		0x00000100
#define XFS_AT_MTIME		0x00000200
#define XFS_AT_CTIME		0x00000400
#define XFS_AT_RDEV		0x00000800
#define XFS_AT_BLKSIZE		0x00001000
#define XFS_AT_NBLOCKS		0x00002000
#define XFS_AT_VCODE		0x00004000
#define XFS_AT_MAC		0x00008000
#define XFS_AT_UPDATIME		0x00010000
#define XFS_AT_UPDMTIME		0x00020000
#define XFS_AT_UPDCTIME		0x00040000
#define XFS_AT_ACL		0x00080000
#define XFS_AT_CAP		0x00100000
#define XFS_AT_INF		0x00200000
#define XFS_AT_XFLAGS		0x00400000
#define XFS_AT_EXTSIZE		0x00800000
#define XFS_AT_NEXTENTS		0x01000000
#define XFS_AT_ANEXTENTS	0x02000000
#define XFS_AT_PROJID		0x04000000
#define XFS_AT_SIZE_NOPERM	0x08000000
#define XFS_AT_GENCOUNT		0x10000000

#define XFS_AT_ALL	(XFS_AT_TYPE|XFS_AT_MODE|XFS_AT_UID|XFS_AT_GID|\
		XFS_AT_FSID|XFS_AT_NODEID|XFS_AT_NLINK|XFS_AT_SIZE|\
		XFS_AT_ATIME|XFS_AT_MTIME|XFS_AT_CTIME|XFS_AT_RDEV|\
		XFS_AT_BLKSIZE|XFS_AT_NBLOCKS|XFS_AT_VCODE|XFS_AT_MAC|\
		XFS_AT_ACL|XFS_AT_CAP|XFS_AT_INF|XFS_AT_XFLAGS|XFS_AT_EXTSIZE|\
		XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS|XFS_AT_PROJID|XFS_AT_GENCOUNT)

#define XFS_AT_STAT	(XFS_AT_TYPE|XFS_AT_MODE|XFS_AT_UID|XFS_AT_GID|\
		XFS_AT_FSID|XFS_AT_NODEID|XFS_AT_NLINK|XFS_AT_SIZE|\
		XFS_AT_ATIME|XFS_AT_MTIME|XFS_AT_CTIME|XFS_AT_RDEV|\
		XFS_AT_BLKSIZE|XFS_AT_NBLOCKS|XFS_AT_PROJID)

#define XFS_AT_TIMES	(XFS_AT_ATIME|XFS_AT_MTIME|XFS_AT_CTIME)

#define XFS_AT_UPDTIMES	(XFS_AT_UPDATIME|XFS_AT_UPDMTIME|XFS_AT_UPDCTIME)

#define XFS_AT_NOSET	(XFS_AT_NLINK|XFS_AT_RDEV|XFS_AT_FSID|XFS_AT_NODEID|\
		XFS_AT_TYPE|XFS_AT_BLKSIZE|XFS_AT_NBLOCKS|XFS_AT_VCODE|\
		XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS|XFS_AT_GENCOUNT)

/*
 *  Modes.
 */
#define VSUID	S_ISUID		/* set user id on execution */
#define VSGID	S_ISGID		/* set group id on execution */
#define VSVTX	S_ISVTX		/* save swapped text even after use */
#define VREAD	S_IRUSR		/* read, write, execute permissions */
#define VWRITE	S_IWUSR
#define VEXEC	S_IXUSR

#define MODEMASK S_IALLUGO	/* mode bits plus permission bits */

/*
 * Check whether mandatory file locking is enabled.
 */
#define MANDLOCK(vp, mode)	\
	(VN_ISREG(vp) && ((mode) & (VSGID|(VEXEC>>3))) == VSGID)

extern void	vn_init(void);
extern int	vn_revalidate(bhv_vnode_t *);

/*
 * Yeah, these don't take vnode anymore at all, all this should be
 * cleaned up at some point.
 */
extern void	vn_iowait(struct xfs_inode *ip);
extern void	vn_iowake(struct xfs_inode *ip);
extern void	vn_ioerror(struct xfs_inode *ip, int error, char *f, int l);

static inline int vn_count(bhv_vnode_t *vp)
{
	return atomic_read(&vn_to_inode(vp)->i_count);
}

/*
 * Vnode reference counting functions (and macros for compatibility).
 */
extern bhv_vnode_t	*vn_hold(bhv_vnode_t *);

#if defined(XFS_INODE_TRACE)
#define VN_HOLD(vp)		\
	((void)vn_hold(vp),	\
	  xfs_itrace_hold(xfs_vtoi(vp), __FILE__, __LINE__, (inst_t *)__return_address))
#define VN_RELE(vp)		\
	  (xfs_itrace_rele(xfs_vtoi(vp), __FILE__, __LINE__, (inst_t *)__return_address), \
	   iput(vn_to_inode(vp)))
#else
#define VN_HOLD(vp)		((void)vn_hold(vp))
#define VN_RELE(vp)		(iput(vn_to_inode(vp)))
#endif

static inline bhv_vnode_t *vn_grab(bhv_vnode_t *vp)
{
	struct inode *inode = igrab(vn_to_inode(vp));
	return inode ? vn_from_inode(inode) : NULL;
}

/*
 * Vname handling macros.
 */
#define VNAME(dentry)		((char *) (dentry)->d_name.name)
#define VNAMELEN(dentry)	((dentry)->d_name.len)
#define VNAME_TO_VNODE(dentry)	(vn_from_inode((dentry)->d_inode))

/*
 * Dealing with bad inodes
 */
static inline int VN_BAD(bhv_vnode_t *vp)
{
	return is_bad_inode(vn_to_inode(vp));
}

/*
 * Extracting atime values in various formats
 */
static inline void vn_atime_to_bstime(bhv_vnode_t *vp, xfs_bstime_t *bs_atime)
{
	bs_atime->tv_sec = vp->i_atime.tv_sec;
	bs_atime->tv_nsec = vp->i_atime.tv_nsec;
}

static inline void vn_atime_to_timespec(bhv_vnode_t *vp, struct timespec *ts)
{
	*ts = vp->i_atime;
}

static inline void vn_atime_to_time_t(bhv_vnode_t *vp, time_t *tt)
{
	*tt = vp->i_atime.tv_sec;
}

/*
 * Some useful predicates.
 */
#define VN_MAPPED(vp)	mapping_mapped(vn_to_inode(vp)->i_mapping)
#define VN_CACHED(vp)	(vn_to_inode(vp)->i_mapping->nrpages)
#define VN_DIRTY(vp)	mapping_tagged(vn_to_inode(vp)->i_mapping, \
					PAGECACHE_TAG_DIRTY)

/*
 * Flags to vop_setattr/getattr.
 */
#define	ATTR_UTIME	0x01	/* non-default utime(2) request */
#define	ATTR_DMI	0x08	/* invocation from a DMI function */
#define	ATTR_LAZY	0x80	/* set/get attributes lazily */
#define	ATTR_NONBLOCK	0x100	/* return EAGAIN if operation would block */
#define ATTR_NOLOCK	0x200	/* Don't grab any conflicting locks */
#define ATTR_NOSIZETOK	0x400	/* Don't get the SIZE token */

/*
 * Flags to vop_fsync/reclaim.
 */
#define FSYNC_NOWAIT	0	/* asynchronous flush */
#define FSYNC_WAIT	0x1	/* synchronous fsync or forced reclaim */
#define FSYNC_INVAL	0x2	/* flush and invalidate cached data */
#define FSYNC_DATA	0x4	/* synchronous fsync of data only */

/*
 * Tracking vnode activity.
 */
#if defined(XFS_INODE_TRACE)

#define	INODE_TRACE_SIZE	16		/* number of trace entries */
#define	INODE_KTRACE_ENTRY	1
#define	INODE_KTRACE_EXIT	2
#define	INODE_KTRACE_HOLD	3
#define	INODE_KTRACE_REF	4
#define	INODE_KTRACE_RELE	5

extern void _xfs_itrace_entry(struct xfs_inode *, const char *, inst_t *);
extern void _xfs_itrace_exit(struct xfs_inode *, const char *, inst_t *);
extern void xfs_itrace_hold(struct xfs_inode *, char *, int, inst_t *);
extern void _xfs_itrace_ref(struct xfs_inode *, char *, int, inst_t *);
extern void xfs_itrace_rele(struct xfs_inode *, char *, int, inst_t *);
#define xfs_itrace_entry(ip)	\
	_xfs_itrace_entry(ip, __FUNCTION__, (inst_t *)__return_address)
#define xfs_itrace_exit(ip)	\
	_xfs_itrace_exit(ip, __FUNCTION__, (inst_t *)__return_address)
#define xfs_itrace_exit_tag(ip, tag)	\
	_xfs_itrace_exit(ip, tag, (inst_t *)__return_address)
#define xfs_itrace_ref(ip)	\
	_xfs_itrace_ref(ip, __FILE__, __LINE__, (inst_t *)__return_address)

#else
#define	xfs_itrace_entry(a)
#define	xfs_itrace_exit(a)
#define	xfs_itrace_exit_tag(a, b)
#define	xfs_itrace_hold(a, b, c, d)
#define	xfs_itrace_ref(a)
#define	xfs_itrace_rele(a, b, c, d)
#endif

#endif	/* __XFS_VNODE_H__ */