xfs: remove xfs_bmse_shift_one
Instead do the actual left and right shift work in the callers, and just keep a helper to update the bmap and rmap btrees as well as the in-core extent list. 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
Darrick J. Wong
Родитель
ecfea3f0c8
Коммит
bf8062800a
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@ -5579,94 +5579,21 @@ done:
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return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &new);
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}
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/*
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* Shift a single extent.
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*/
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STATIC int
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xfs_bmse_shift_one(
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struct xfs_inode *ip,
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int whichfork,
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xfs_fileoff_t offset_shift_fsb,
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int *current_ext,
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struct xfs_bmbt_irec *got,
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struct xfs_btree_cur *cur,
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int *logflags,
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enum shift_direction direction,
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struct xfs_defer_ops *dfops)
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static int
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xfs_bmap_shift_update_extent(
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struct xfs_inode *ip,
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int whichfork,
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xfs_extnum_t idx,
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struct xfs_bmbt_irec *got,
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struct xfs_btree_cur *cur,
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int *logflags,
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struct xfs_defer_ops *dfops,
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xfs_fileoff_t startoff)
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{
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struct xfs_ifork *ifp;
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struct xfs_mount *mp;
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xfs_fileoff_t startoff;
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struct xfs_bmbt_irec adj_irec, new;
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int error;
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int i;
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int total_extents;
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_bmbt_irec new;
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int error, i;
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mp = ip->i_mount;
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ifp = XFS_IFORK_PTR(ip, whichfork);
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total_extents = xfs_iext_count(ifp);
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/* delalloc extents should be prevented by caller */
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XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got->br_startblock));
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if (direction == SHIFT_LEFT) {
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startoff = got->br_startoff - offset_shift_fsb;
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/*
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* Check for merge if we've got an extent to the left,
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* otherwise make sure there's enough room at the start
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* of the file for the shift.
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*/
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if (!*current_ext) {
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if (got->br_startoff < offset_shift_fsb)
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return -EINVAL;
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goto update_current_ext;
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}
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/*
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* grab the left extent and check for a large enough hole.
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*/
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xfs_iext_get_extent(ifp, *current_ext - 1, &adj_irec);
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if (startoff < adj_irec.br_startoff + adj_irec.br_blockcount)
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return -EINVAL;
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/* check whether to merge the extent or shift it down */
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if (xfs_bmse_can_merge(&adj_irec, got, offset_shift_fsb)) {
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return xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
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*current_ext, got, &adj_irec,
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cur, logflags, dfops);
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}
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} else {
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startoff = got->br_startoff + offset_shift_fsb;
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/* nothing to move if this is the last extent */
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if (*current_ext >= (total_extents - 1))
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goto update_current_ext;
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/*
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* If this is not the last extent in the file, make sure there
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* is enough room between current extent and next extent for
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* accommodating the shift.
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*/
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xfs_iext_get_extent(ifp, *current_ext + 1, &adj_irec);
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if (startoff + got->br_blockcount > adj_irec.br_startoff)
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return -EINVAL;
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/*
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* Unlike a left shift (which involves a hole punch),
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* a right shift does not modify extent neighbors
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* in any way. We should never find mergeable extents
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* in this scenario. Check anyways and warn if we
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* encounter two extents that could be one.
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*/
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if (xfs_bmse_can_merge(got, &adj_irec, offset_shift_fsb))
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WARN_ON_ONCE(1);
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}
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/*
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* Increment the extent index for the next iteration, update the start
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* offset of the in-core extent and update the btree if applicable.
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*/
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update_current_ext:
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*logflags |= XFS_ILOG_CORE;
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new = *got;
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@ -5685,13 +5612,8 @@ update_current_ext:
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*logflags |= XFS_ILOG_DEXT;
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}
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xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork),
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*current_ext, &new);
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if (direction == SHIFT_LEFT)
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(*current_ext)++;
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else
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(*current_ext)--;
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xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), idx,
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&new);
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/* update reverse mapping */
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error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, got);
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@ -5715,10 +5637,11 @@ xfs_bmap_collapse_extents(
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
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struct xfs_btree_cur *cur = NULL;
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struct xfs_bmbt_irec got;
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struct xfs_bmbt_irec got, prev;
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xfs_extnum_t current_ext;
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xfs_extnum_t total_extents;
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xfs_extnum_t stop_extent;
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xfs_fileoff_t new_startoff;
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int error = 0;
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int logflags = 0;
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@ -5771,6 +5694,7 @@ xfs_bmap_collapse_extents(
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*done = true;
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goto del_cursor;
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}
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XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock));
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stop_extent = total_extents;
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if (current_ext >= stop_extent) {
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@ -5778,11 +5702,36 @@ xfs_bmap_collapse_extents(
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goto del_cursor;
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}
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error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
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¤t_ext, &got, cur, &logflags,
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SHIFT_LEFT, dfops);
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new_startoff = got.br_startoff - offset_shift_fsb;
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if (current_ext) {
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xfs_iext_get_extent(ifp, current_ext - 1, &prev);
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if (new_startoff < prev.br_startoff + prev.br_blockcount) {
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error = -EINVAL;
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goto del_cursor;
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}
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/* check whether to merge the extent or shift it down */
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if (xfs_bmse_can_merge(&prev, &got, offset_shift_fsb)) {
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error = xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
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current_ext, &got, &prev, cur,
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&logflags, dfops);
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if (error)
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goto del_cursor;
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goto done;
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}
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} else {
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if (got.br_startoff < offset_shift_fsb) {
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error = -EINVAL;
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goto del_cursor;
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}
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}
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error = xfs_bmap_shift_update_extent(ip, whichfork, current_ext, &got,
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cur, &logflags, dfops, new_startoff);
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if (error)
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goto del_cursor;
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current_ext++;
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done:
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/*
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* If there was an extent merge during the shift, the extent
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* count can change. Update the total and grade the next record.
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@ -5795,17 +5744,13 @@ xfs_bmap_collapse_extents(
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}
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xfs_iext_get_extent(ifp, current_ext, &got);
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if (!*done)
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*next_fsb = got.br_startoff;
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*next_fsb = got.br_startoff;
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del_cursor:
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if (cur)
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xfs_btree_del_cursor(cur,
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error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
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if (logflags)
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xfs_trans_log_inode(tp, ip, logflags);
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return error;
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}
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@ -5824,10 +5769,11 @@ xfs_bmap_insert_extents(
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
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struct xfs_btree_cur *cur = NULL;
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struct xfs_bmbt_irec got, s;
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struct xfs_bmbt_irec got, next, s;
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xfs_extnum_t current_ext;
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xfs_extnum_t total_extents;
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xfs_extnum_t stop_extent;
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xfs_fileoff_t new_startoff;
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int error = 0;
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int logflags = 0;
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@ -5894,6 +5840,7 @@ xfs_bmap_insert_extents(
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goto del_cursor;
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}
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}
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XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock));
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/* Lookup the extent index at which we have to stop */
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xfs_iext_lookup_extent(ip, ifp, stop_fsb, &stop_extent, &s);
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@ -5904,27 +5851,41 @@ xfs_bmap_insert_extents(
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goto del_cursor;
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}
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error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
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¤t_ext, &got, cur, &logflags,
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SHIFT_RIGHT, dfops);
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new_startoff = got.br_startoff + offset_shift_fsb;
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if (current_ext < total_extents - 1) {
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xfs_iext_get_extent(ifp, current_ext + 1, &next);
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if (new_startoff + got.br_blockcount > next.br_startoff) {
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error = -EINVAL;
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goto del_cursor;
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}
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/*
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* Unlike a left shift (which involves a hole punch), a right
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* shift does not modify extent neighbors in any way. We should
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* never find mergeable extents in this scenario. Check anyways
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* and warn if we encounter two extents that could be one.
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*/
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if (xfs_bmse_can_merge(&got, &next, offset_shift_fsb))
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WARN_ON_ONCE(1);
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}
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error = xfs_bmap_shift_update_extent(ip, whichfork, current_ext, &got,
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cur, &logflags, dfops, new_startoff);
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if (error)
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goto del_cursor;
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if (current_ext == stop_extent) {
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if (--current_ext == stop_extent) {
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*done = true;
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goto del_cursor;
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}
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xfs_iext_get_extent(ifp, current_ext, &got);
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*next_fsb = got.br_startoff;
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del_cursor:
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if (cur)
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xfs_btree_del_cursor(cur,
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error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
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if (logflags)
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xfs_trans_log_inode(tp, ip, logflags);
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return error;
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}
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@ -183,11 +183,6 @@ static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
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!isnullstartblock(irec->br_startblock);
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}
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enum shift_direction {
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SHIFT_LEFT = 0,
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SHIFT_RIGHT,
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};
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void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
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xfs_filblks_t len);
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void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
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