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@xxxxxx>
---
fs/xfs/libxfs/xfs_iext_tree.c | 6 ++++++
fs/xfs/libxfs/xfs_inode_fork.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_iext_tree.c b/fs/xfs/libxfs/xfs_iext_tree.c
index b80c63faace2..8a7aea041ee1 100644
--- a/fs/xfs/libxfs/xfs_iext_tree.c
+++ b/fs/xfs/libxfs/xfs_iext_tree.c
@@ -624,6 +624,8 @@ xfs_iext_insert(
struct xfs_iext_leaf *new = NULL;
int nr_entries, i;
+ ifp->if_seq++;
+
if (ifp->if_height == 0)
xfs_iext_alloc_root(ifp, cur);
else if (ifp->if_height == 1)
@@ -864,6 +866,8 @@ xfs_iext_remove(
ASSERT(ifp->if_u1.if_root != NULL);
ASSERT(xfs_iext_valid(ifp, cur));
+ ifp->if_seq++;
+
nr_entries = xfs_iext_leaf_nr_entries(ifp, leaf, cur->pos) - 1;
for (i = cur->pos; i < nr_entries; i++)
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);
+ ifp->if_seq++;
+
if (cur->pos == 0) {
struct xfs_bmbt_irec old;
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index 1492143371f3..f20b2468ca35 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -14,6 +14,7 @@ struct xfs_dinode;
*/
struct xfs_ifork {
int if_bytes; /* bytes in if_u1 */
+ unsigned int if_seq;
struct xfs_btree_block *if_broot; /* file's incore btree root */
short if_broot_bytes; /* bytes allocated for root */
unsigned char if_flags; /* per-fork flags */
--
2.18.0
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