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xfs: remove the if_ext_max field in struct xfs_ifork

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We spent a lot of effort to maintain this field, but it always equals to the
fork size divided by the constant size of an extent.  The prime use of it is
to assert that the two stay in sync.  Just divide the fork size by the extent
size in the few places that we actually use it and remove the overhead
of maintaining it.  Also introduce a few helpers to consolidate the places
where we actually care about the value.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig
2011-12-18 20:00:07 +00:00
committed by Ben Myers
parent 3d2b3129c2
commit 8096b1ebb5
8 changed files with 81 additions and 115 deletions
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101
fs/xfs/xfs_bmap.c
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@@ -249,7 +249,27 @@ xfs_bmbt_lookup_ge(
}
/*
* Update the record referred to by cur to the value given
* Check if the inode needs to be converted to btree format.
*/
static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
{
return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >
XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Check if the inode should be converted to extent format.
*/
static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
{
return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <=
XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Update the record referred to by cur to the value given
* by [off, bno, len, state].
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
@@ -683,8 +703,8 @@ xfs_bmap_add_extent_delay_real(
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
if (bma->ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
bma->ip->i_d.di_nextents > bma->ip->i_df.if_ext_max) {
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->flist,
&bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
@@ -767,8 +787,8 @@ xfs_bmap_add_extent_delay_real(
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
if (bma->ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
bma->ip->i_d.di_nextents > bma->ip->i_df.if_ext_max) {
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->flist, &bma->cur, 1,
&tmp_rval, XFS_DATA_FORK);
@@ -836,8 +856,8 @@ xfs_bmap_add_extent_delay_real(
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
if (bma->ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
bma->ip->i_d.di_nextents > bma->ip->i_df.if_ext_max) {
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->flist, &bma->cur,
1, &tmp_rval, XFS_DATA_FORK);
@@ -884,8 +904,7 @@ xfs_bmap_add_extent_delay_real(
}
/* convert to a btree if necessary */
if (XFS_IFORK_FORMAT(bma->ip, XFS_DATA_FORK) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(bma->ip, XFS_DATA_FORK) > ifp->if_ext_max) {
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(bma->cur == NULL);
@@ -1421,8 +1440,7 @@ xfs_bmap_add_extent_unwritten_real(
}
/* convert to a btree if necessary */
if (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > ifp->if_ext_max) {
if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
@@ -1812,8 +1830,7 @@ xfs_bmap_add_extent_hole_real(
}
/* convert to a btree if necessary */
if (XFS_IFORK_FORMAT(bma->ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(bma->ip, whichfork) > ifp->if_ext_max) {
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(bma->cur == NULL);
@@ -3037,8 +3054,7 @@ xfs_bmap_extents_to_btree(
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
/*
* Make space in the inode incore.
*/
@@ -3184,13 +3200,8 @@ xfs_bmap_forkoff_reset(
ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
if (dfl_forkoff > ip->i_d.di_forkoff) {
if (dfl_forkoff > ip->i_d.di_forkoff)
ip->i_d.di_forkoff = dfl_forkoff;
ip->i_df.if_ext_max =
XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
ip->i_afp->if_ext_max =
XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
}
}
}
@@ -3430,8 +3441,6 @@ xfs_bmap_add_attrfork(
int error; /* error return value */
ASSERT(XFS_IFORK_Q(ip) == 0);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
mp = ip->i_mount;
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
@@ -3486,12 +3495,9 @@ xfs_bmap_add_attrfork(
error = XFS_ERROR(EINVAL);
goto error1;
}
ip->i_df.if_ext_max =
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(ip->i_afp == NULL);
ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
ip->i_afp->if_ext_max =
XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
ip->i_afp->if_flags = XFS_IFEXTENTS;
logflags = 0;
xfs_bmap_init(&flist, &firstblock);
@@ -3535,20 +3541,17 @@ xfs_bmap_add_attrfork(
} else
spin_unlock(&mp->m_sb_lock);
}
if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
error = xfs_bmap_finish(&tp, &flist, &committed);
if (error)
goto error2;
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
return error;
return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
error2:
xfs_bmap_cancel(&flist);
error1:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
error0:
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
ASSERT(ip->i_df.if_ext_max ==
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
return error;
}
@@ -4379,8 +4382,6 @@ xfs_bmapi_read(
XFS_STATS_INC(xs_blk_mapr);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, whichfork);
@@ -4871,8 +4872,6 @@ xfs_bmapi_write(
return XFS_ERROR(EIO);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
XFS_STATS_INC(xs_blk_mapw);
@@ -4981,8 +4980,7 @@ xfs_bmapi_write(
/*
* Transform from btree to extents, give it cur.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
if (xfs_bmap_wants_extents(ip, whichfork)) {
int tmp_logflags = 0;
ASSERT(bma.cur);
@@ -4992,10 +4990,10 @@ xfs_bmapi_write(
if (error)
goto error0;
}
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
XFS_IFORK_NEXTENTS(ip, whichfork) >
XFS_IFORK_MAXEXT(ip, whichfork));
error = 0;
error0:
/*
@@ -5095,8 +5093,7 @@ xfs_bunmapi(
ASSERT(len > 0);
ASSERT(nexts >= 0);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
@@ -5322,7 +5319,8 @@ xfs_bunmapi(
*/
if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */
XFS_IFORK_MAXEXT(ip, whichfork) &&
del.br_startoff > got.br_startoff &&
del.br_startoff + del.br_blockcount <
got.br_startoff + got.br_blockcount) {
@@ -5353,13 +5351,11 @@ nodelete:
}
}
*done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
/*
* Convert to a btree if necessary.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
if (xfs_bmap_needs_btree(ip, whichfork)) {
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
&cur, 0, &tmp_logflags, whichfork);
@@ -5370,8 +5366,7 @@ nodelete:
/*
* transform from btree to extents, give it cur
*/
else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
else if (xfs_bmap_wants_extents(ip, whichfork)) {
ASSERT(cur != NULL);
error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
whichfork);
@@ -5382,8 +5377,6 @@ nodelete:
/*
* transform from extents to local?
*/
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
error = 0;
error0:
/*