diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_iext_tree.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_iext_tree.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/fs/xfs/libxfs/xfs_iext_tree.c b/fs/xfs/libxfs/xfs_iext_tree.c index 8a7aea041ee1..771dd072015d 100644 --- a/fs/xfs/libxfs/xfs_iext_tree.c +++ b/fs/xfs/libxfs/xfs_iext_tree.c @@ -14,6 +14,7 @@ #include "xfs_inode_fork.h" #include "xfs_trans_resv.h" #include "xfs_mount.h" +#include "xfs_bmap.h" #include "xfs_trace.h" /* @@ -612,6 +613,19 @@ xfs_iext_realloc_root( cur->leaf = new; } +/* + * Increment the sequence counter if we are on a COW fork. This allows + * the writeback code to skip looking for a COW extent if the COW fork + * hasn't changed. We use WRITE_ONCE here to ensure the update to the + * sequence counter is seen before the modifications to the extent + * tree itself take effect. + */ +static inline void xfs_iext_inc_seq(struct xfs_ifork *ifp, int state) +{ + if (state & BMAP_COWFORK) + WRITE_ONCE(ifp->if_seq, READ_ONCE(ifp->if_seq) + 1); +} + void xfs_iext_insert( struct xfs_inode *ip, @@ -624,7 +638,7 @@ xfs_iext_insert( struct xfs_iext_leaf *new = NULL; int nr_entries, i; - ifp->if_seq++; + xfs_iext_inc_seq(ifp, state); if (ifp->if_height == 0) xfs_iext_alloc_root(ifp, cur); @@ -866,7 +880,7 @@ xfs_iext_remove( ASSERT(ifp->if_u1.if_root != NULL); ASSERT(xfs_iext_valid(ifp, cur)); - ifp->if_seq++; + xfs_iext_inc_seq(ifp, state); nr_entries = xfs_iext_leaf_nr_entries(ifp, leaf, cur->pos) - 1; for (i = cur->pos; i < nr_entries; i++) @@ -974,7 +988,7 @@ xfs_iext_update_extent( { struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state); - ifp->if_seq++; + xfs_iext_inc_seq(ifp, state); if (cur->pos == 0) { struct xfs_bmbt_irec old; |