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xfs: in btree_lshift, only allocate temporary cursor when needed

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We only need the temporary cursor in _btree_lshift if we're shifting
in an overlapped btree.  Therefore, factor that into a single block
of code so we avoid unnecessary cursor duplication.

Also fix use of the wrong cursor when checking for corruption in
xfs_btree_rshift().

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-08-03 12:26:22 +10:00 committed by Dave Chinner
parent 1f704b2b47
commit c1d22ae89c
1 changed files with 19 additions and 19 deletions
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38
fs/xfs/libxfs/xfs_btree.c
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@ -2397,29 +2397,29 @@ xfs_btree_lshift(
* Using a temporary cursor, update the parent key values of the
* block on the left.
*/
error = xfs_btree_dup_cursor(cur, &tcur);
if (error)
goto error0;
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, error0);
if (cur->bc_flags & XFS_BTREE_OVERLAPPING) {
error = xfs_btree_dup_cursor(cur, &tcur);
if (error)
goto error0;
i = xfs_btree_firstrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(tcur->bc_mp, i == 1, error0);
error = xfs_btree_decrement(tcur, level, &i);
if (error)
goto error1;
error = xfs_btree_decrement(tcur, level, &i);
if (error)
goto error1;
/* Update the parent high keys of the left block, if needed. */
error = xfs_btree_update_keys(tcur, level);
if (error)
goto error1;
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
}
/* Update the parent keys of the right block. */
error = xfs_btree_update_keys(cur, level);
if (error)
goto error1;
/* Update the parent high keys of the left block, if needed. */
if (tcur->bc_flags & XFS_BTREE_OVERLAPPING) {
error = xfs_btree_update_keys(tcur, level);
if (error)
goto error1;
}
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
goto error0;
/* Slide the cursor value left one. */
cur->bc_ptrs[level]--;
@ -2580,7 +2580,7 @@ xfs_btree_rshift(
if (error)
goto error0;
i = xfs_btree_lastrec(tcur, level);
XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, error0);
XFS_WANT_CORRUPTED_GOTO(tcur->bc_mp, i == 1, error0);
error = xfs_btree_increment(tcur, level, &i);
if (error)