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xfs: add xfs_ilock_attr_map_shared

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Equivalent to xfs_ilock_data_map_shared, except for the attribute fork.

Make xfs_getbmap use it if called for the attribute fork instead of
xfs_ilock_data_map_shared.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2013-12-18 02:14:39 -08:00 • committed by Ben Myers
parent 309ecac8e7
commit efa70be165
3 changed files with 42 additions and 22 deletions
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34
fs/xfs/xfs_inode.c
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@ -77,17 +77,18 @@ xfs_get_extsz_hint(
}
/*
* This is a wrapper routine around the xfs_ilock() routine used to centralize
* some grungy code. It is used in places that wish to lock the inode solely
* for reading the extents. The reason these places can't just call
* xfs_ilock(SHARED) is that the inode lock also guards to bringing in of the
* extents from disk for a file in b-tree format. If the inode is in b-tree
* format, then we need to lock the inode exclusively until the extents are read
* in. Locking it exclusively all the time would limit our parallelism
* unnecessarily, though. What we do instead is check to see if the extents
* have been read in yet, and only lock the inode exclusively if they have not.
* These two are wrapper routines around the xfs_ilock() routine used to
* centralize some grungy code. They are used in places that wish to lock the
* inode solely for reading the extents. The reason these places can't just
* call xfs_ilock(ip, XFS_ILOCK_SHARED) is that the inode lock also guards to
* bringing in of the extents from disk for a file in b-tree format. If the
* inode is in b-tree format, then we need to lock the inode exclusively until
* the extents are read in. Locking it exclusively all the time would limit
* our parallelism unnecessarily, though. What we do instead is check to see
* if the extents have been read in yet, and only lock the inode exclusively
* if they have not.
*
* The function returns a value which should be given to the corresponding
* The functions return a value which should be given to the corresponding
* xfs_iunlock() call.
*/
uint
@ -103,6 +104,19 @@ xfs_ilock_data_map_shared(
return lock_mode;
}
uint
xfs_ilock_attr_map_shared(
struct xfs_inode *ip)
{
uint lock_mode = XFS_ILOCK_SHARED;
if (ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE &&
(ip->i_afp->if_flags & XFS_IFEXTENTS) == 0)
lock_mode = XFS_ILOCK_EXCL;
xfs_ilock(ip, lock_mode);
return lock_mode;
}
/*
* The xfs inode contains 2 locks: a multi-reader lock called the
* i_iolock and a multi-reader lock called the i_lock. This routine