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xfs: remove if_lastex 

The if_lastex field in struct xfs_ifork is only used as a temporary
index during xfs_bmapi and xfs_bunmapi.  Instead of using the inode
fork to store it keep it local in the callchain.  Fortunately this
is very easy as we already pass a stack copy of it down the whole
chain which can simplify be changed to be passed by reference.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-05-23 08:52:53 +00:00 committed by Alex Elder
parent 548932739b
commit ec90c55634
3 changed files with 205 additions and 225 deletions
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427
fs/xfs/xfs_bmap.c
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File diff suppressed because it is too large Load Diff

2
fs/xfs/xfs_inode.c
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@ -920,7 +920,6 @@ xfs_iread_extents(
/*
* We know that the size is valid (it's checked in iformat_btree)
*/
ifp->if_lastex = NULLEXTNUM;
ifp->if_bytes = ifp->if_real_bytes = 0;
ifp->if_flags |= XFS_IFEXTENTS;
xfs_iext_add(ifp, 0, nextents);
@ -3191,7 +3190,6 @@ xfs_iext_add(
}
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
ifp->if_real_bytes = 0;
ifp->if_lastex = nextents + ext_diff;
}
/*
* Otherwise use a linear (direct) extent list.

1
fs/xfs/xfs_inode.h
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@ -67,7 +67,6 @@ typedef struct xfs_ifork {
short if_broot_bytes; /* bytes allocated for root */
unsigned char if_flags; /* per-fork flags */
unsigned char if_ext_max; /* max # of extent records */
xfs_extnum_t if_lastex; /* last if_extents used */
union {
xfs_bmbt_rec_host_t *if_extents;/* linear map file exts */
xfs_ext_irec_t *if_ext_irec; /* irec map file exts */