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xfs: maintain a sequence count for inode fork manipulations

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Add a simple 32-bit unsigned integer as the sequence count for
modifications to the extent list in the inode fork.  This will be
used to optimize away extent list lookups in the writeback code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
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 2018-07-17 16:51:51 -07:00 committed by Darrick J. Wong
parent 9e037cb797
commit 745b3f76d1
2 changed files with 7 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
fs/xfs/libxfs/xfs_iext_tree.c
View file

@ -624,6 +624,8 @@ xfs_iext_insert(
struct xfs_iext_leaf *new = NULL; struct xfs_iext_leaf *new = NULL;
int nr_entries, i; int nr_entries, i;
ifp->if_seq++;
if (ifp->if_height == 0) if (ifp->if_height == 0)
xfs_iext_alloc_root(ifp, cur); xfs_iext_alloc_root(ifp, cur);
else if (ifp->if_height == 1) else if (ifp->if_height == 1)
@ -864,6 +866,8 @@ xfs_iext_remove(
ASSERT(ifp->if_u1.if_root != NULL); ASSERT(ifp->if_u1.if_root != NULL);
ASSERT(xfs_iext_valid(ifp, cur)); ASSERT(xfs_iext_valid(ifp, cur));
ifp->if_seq++;
nr_entries = xfs_iext_leaf_nr_entries(ifp, leaf, cur->pos) - 1; nr_entries = xfs_iext_leaf_nr_entries(ifp, leaf, cur->pos) - 1;
for (i = cur->pos; i < nr_entries; i++) for (i = cur->pos; i < nr_entries; i++)
leaf->recs[i] = leaf->recs[i + 1]; leaf->recs[i] = leaf->recs[i + 1];
@ -970,6 +974,8 @@ xfs_iext_update_extent(
{ {
struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state); struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state);
ifp->if_seq++;
if (cur->pos == 0) { if (cur->pos == 0) {
struct xfs_bmbt_irec old; struct xfs_bmbt_irec old;

1
fs/xfs/libxfs/xfs_inode_fork.h
View file

@ -14,6 +14,7 @@ struct xfs_dinode;
*/ */
struct xfs_ifork { struct xfs_ifork {
int if_bytes; /* bytes in if_u1 */ int if_bytes; /* bytes in if_u1 */
unsigned int if_seq; /* cow fork mod counter */
struct xfs_btree_block *if_broot; /* file's incore btree root */ struct xfs_btree_block *if_broot; /* file's incore btree root */
short if_broot_bytes; /* bytes allocated for root */ short if_broot_bytes; /* bytes allocated for root */
unsigned char if_flags; /* per-fork flags */ unsigned char if_flags; /* per-fork flags */