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xfs: use xfs_iext_*_extent helpers in xfs_bmap_shift_extents 

This abstracts the function away from details of the low-level extent
list implementation.

Note that it seems like the previous implementation of rmap for
the merge case was completely broken, but it no seems appear to
trigger that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-08-29 15:44:13 -07:00 committed by Darrick J. Wong
parent 05b7c8ab2b
commit 4da6b514ea
1 changed files with 90 additions and 94 deletions
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184
fs/xfs/libxfs/xfs_bmap.c
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@ -5881,32 +5881,26 @@ xfs_bmse_merge(
int whichfork,
xfs_fileoff_t shift, /* shift fsb */
int current_ext, /* idx of gotp */
struct xfs_bmbt_rec_host *gotp, /* extent to shift */
struct xfs_bmbt_rec_host *leftp, /* preceding extent */
struct xfs_bmbt_irec *got, /* extent to shift */
struct xfs_bmbt_irec *left, /* preceding extent */
struct xfs_btree_cur *cur,
int *logflags) /* output */
int *logflags, /* output */
struct xfs_defer_ops *dfops)
{
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec left;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec new;
xfs_filblks_t blockcount;
int error, i;
struct xfs_mount *mp = ip->i_mount;
xfs_bmbt_get_all(gotp, &got);
xfs_bmbt_get_all(leftp, &left);
blockcount = left.br_blockcount + got.br_blockcount;
blockcount = left->br_blockcount + got->br_blockcount;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(xfs_bmse_can_merge(&left, &got, shift));
ASSERT(xfs_bmse_can_merge(left, got, shift));
/*
* Merge the in-core extents. Note that the host record pointers and
* current_ext index are invalid once the extent has been removed via
* xfs_iext_remove().
*/
xfs_bmbt_set_blockcount(leftp, blockcount);
xfs_iext_remove(ip, current_ext, 1, 0);
new = *left;
new.br_blockcount = blockcount;
/*
* Update the on-disk extent count, the btree if necessary and log the
@ -5917,12 +5911,12 @@ xfs_bmse_merge(
*logflags |= XFS_ILOG_CORE;
if (!cur) {
*logflags |= XFS_ILOG_DEXT;
return 0;
goto done;
}
/* lookup and remove the extent to merge */
error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock,
got.br_blockcount, &i);
error = xfs_bmbt_lookup_eq(cur, got->br_startoff, got->br_startblock,
got->br_blockcount, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
@ -5933,16 +5927,29 @@ xfs_bmse_merge(
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
/* lookup and update size of the previous extent */
error = xfs_bmbt_lookup_eq(cur, left.br_startoff, left.br_startblock,
left.br_blockcount, &i);
error = xfs_bmbt_lookup_eq(cur, left->br_startoff, left->br_startblock,
left->br_blockcount, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
left.br_blockcount = blockcount;
error = xfs_bmbt_update(cur, new.br_startoff, new.br_startblock,
new.br_blockcount, new.br_state);
if (error)
return error;
return xfs_bmbt_update(cur, left.br_startoff, left.br_startblock,
left.br_blockcount, left.br_state);
done:
xfs_iext_update_extent(ifp, current_ext - 1, &new);
xfs_iext_remove(ip, current_ext, 1, 0);
/* update reverse mapping */
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, got);
if (error)
return error;
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, left);
if (error)
return error;
return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &new);
}
/*
@ -5954,7 +5961,7 @@ xfs_bmse_shift_one(
int whichfork,
xfs_fileoff_t offset_shift_fsb,
int *current_ext,
struct xfs_bmbt_rec_host *gotp,
struct xfs_bmbt_irec *got,
struct xfs_btree_cur *cur,
int *logflags,
enum shift_direction direction,
@ -5963,9 +5970,7 @@ xfs_bmse_shift_one(
struct xfs_ifork *ifp;
struct xfs_mount *mp;
xfs_fileoff_t startoff;
struct xfs_bmbt_rec_host *adj_irecp;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec adj_irec;
struct xfs_bmbt_irec adj_irec, new;
int error;
int i;
int total_extents;
@ -5974,13 +5979,11 @@ xfs_bmse_shift_one(
ifp = XFS_IFORK_PTR(ip, whichfork);
total_extents = xfs_iext_count(ifp);
xfs_bmbt_get_all(gotp, &got);
/* delalloc extents should be prevented by caller */
XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock));
XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got->br_startblock));
if (direction == SHIFT_LEFT) {
startoff = got.br_startoff - offset_shift_fsb;
startoff = got->br_startoff - offset_shift_fsb;
/*
* Check for merge if we've got an extent to the left,
@ -5988,46 +5991,39 @@ xfs_bmse_shift_one(
* of the file for the shift.
*/
if (!*current_ext) {
if (got.br_startoff < offset_shift_fsb)
if (got->br_startoff < offset_shift_fsb)
return -EINVAL;
goto update_current_ext;
}
/*
* grab the left extent and check for a large
* enough hole.
*/
adj_irecp = xfs_iext_get_ext(ifp, *current_ext - 1);
xfs_bmbt_get_all(adj_irecp, &adj_irec);
if (startoff <
adj_irec.br_startoff + adj_irec.br_blockcount)
/*
* grab the left extent and check for a large enough hole.
*/
xfs_iext_get_extent(ifp, *current_ext - 1, &adj_irec);
if (startoff < adj_irec.br_startoff + adj_irec.br_blockcount)
return -EINVAL;
/* check whether to merge the extent or shift it down */
if (xfs_bmse_can_merge(&adj_irec, &got,
offset_shift_fsb)) {
error = xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
*current_ext, gotp, adj_irecp,
cur, logflags);
if (error)
return error;
adj_irec = got;
goto update_rmap;
if (xfs_bmse_can_merge(&adj_irec, got, offset_shift_fsb)) {
return xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
*current_ext, got, &adj_irec,
cur, logflags, dfops);
}
} else {
startoff = got.br_startoff + offset_shift_fsb;
startoff = got->br_startoff + offset_shift_fsb;
/* nothing to move if this is the last extent */
if (*current_ext >= (total_extents - 1))
goto update_current_ext;
/*
* If this is not the last extent in the file, make sure there
* is enough room between current extent and next extent for
* accommodating the shift.
*/
adj_irecp = xfs_iext_get_ext(ifp, *current_ext + 1);
xfs_bmbt_get_all(adj_irecp, &adj_irec);
if (startoff + got.br_blockcount > adj_irec.br_startoff)
xfs_iext_get_extent(ifp, *current_ext + 1, &adj_irec);
if (startoff + got->br_blockcount > adj_irec.br_startoff)
return -EINVAL;
/*
* Unlike a left shift (which involves a hole punch),
* a right shift does not modify extent neighbors
@ -6035,45 +6031,48 @@ xfs_bmse_shift_one(
* in this scenario. Check anyways and warn if we
* encounter two extents that could be one.
*/
if (xfs_bmse_can_merge(&got, &adj_irec, offset_shift_fsb))
if (xfs_bmse_can_merge(got, &adj_irec, offset_shift_fsb))
WARN_ON_ONCE(1);
}
/*
* Increment the extent index for the next iteration, update the start
* offset of the in-core extent and update the btree if applicable.
*/
update_current_ext:
*logflags |= XFS_ILOG_CORE;
new = *got;
new.br_startoff = startoff;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, got->br_startoff,
got->br_startblock, got->br_blockcount, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
error = xfs_bmbt_update(cur, new.br_startoff,
new.br_startblock, new.br_blockcount,
new.br_state);
if (error)
return error;
} else {
*logflags |= XFS_ILOG_DEXT;
}
xfs_iext_update_extent(ifp, *current_ext, &new);
if (direction == SHIFT_LEFT)
(*current_ext)++;
else
(*current_ext)--;
xfs_bmbt_set_startoff(gotp, startoff);
*logflags |= XFS_ILOG_CORE;
adj_irec = got;
if (!cur) {
*logflags |= XFS_ILOG_DEXT;
goto update_rmap;
}
error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock,
got.br_blockcount, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
got.br_startoff = startoff;
error = xfs_bmbt_update(cur, got.br_startoff, got.br_startblock,
got.br_blockcount, got.br_state);
if (error)
return error;
update_rmap:
/* update reverse mapping */
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, &adj_irec);
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, got);
if (error)
return error;
adj_irec.br_startoff = startoff;
return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &adj_irec);
return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &new);
}
/*
@ -6100,7 +6099,6 @@ xfs_bmap_shift_extents(
int num_exts)
{
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_rec_host *gotp;
struct xfs_bmbt_irec got;
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
@ -6161,25 +6159,23 @@ xfs_bmap_shift_extents(
ASSERT(direction == SHIFT_RIGHT);
current_ext = total_extents - 1;
gotp = xfs_iext_get_ext(ifp, current_ext);
xfs_bmbt_get_all(gotp, &got);
*next_fsb = got.br_startoff;
if (stop_fsb > *next_fsb) {
xfs_iext_get_extent(ifp, current_ext, &got);
if (stop_fsb > got.br_startoff) {
*done = 1;
goto del_cursor;
}
*next_fsb = got.br_startoff;
} else {
/*
* Look up the extent index for the fsb where we start shifting. We can
* henceforth iterate with current_ext as extent list changes are locked
* out via ilock.
*
* gotp can be null in 2 cases: 1) if there are no extents or 2)
* *next_fsb lies in a hole beyond which there are no extents. Either
* way, we are done.
* If next_fsb lies in a hole beyond which there are no extents we are
* done.
*/
gotp = xfs_iext_bno_to_ext(ifp, *next_fsb, &current_ext);
if (!gotp) {
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &current_ext,
&got)) {
*done = 1;
goto del_cursor;
}
@ -6187,7 +6183,9 @@ xfs_bmap_shift_extents(
/* Lookup the extent index at which we have to stop */
if (direction == SHIFT_RIGHT) {
xfs_iext_bno_to_ext(ifp, stop_fsb, &stop_extent);
struct xfs_bmbt_irec s;
xfs_iext_lookup_extent(ip, ifp, stop_fsb, &stop_extent, &s);
/* Make stop_extent exclusive of shift range */
stop_extent--;
if (current_ext <= stop_extent) {
@ -6204,7 +6202,7 @@ xfs_bmap_shift_extents(
while (nexts++ < num_exts) {
error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
&current_ext, gotp, cur, &logflags,
&current_ext, &got, cur, &logflags,
direction, dfops);
if (error)
goto del_cursor;
@ -6222,13 +6220,11 @@ xfs_bmap_shift_extents(
*next_fsb = NULLFSBLOCK;
break;
}
gotp = xfs_iext_get_ext(ifp, current_ext);
xfs_iext_get_extent(ifp, current_ext, &got);
}
if (!*done) {
xfs_bmbt_get_all(gotp, &got);
if (!*done)
*next_fsb = got.br_startoff;
}
del_cursor:
if (cur)