xfs_inodes_free_eofblocks() implements scanning functionality for
EOFBLOCKS inodes. It uses the AG iterator to walk the tagged inodes
and free post-EOF blocks via the xfs_inode_free_eofblocks() execute
function. The scan can be invoked in best-effort mode or wait
(force) mode.
A best-effort scan (default) handles all inodes that do not have a
dirty cache and we successfully acquire the io lock via trylock. In
wait mode, we continue to cycle through an AG until all inodes are
handled.
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/xfs_sync.c | 40 ++++++++++++++++++++++++++++++++++++++++
fs/xfs/xfs_sync.h | 1 +
fs/xfs/xfs_trace.h | 1 +
3 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c
index 0da93c9..48cab9f 100644
--- a/fs/xfs/xfs_sync.c
+++ b/fs/xfs/xfs_sync.c
@@ -1014,6 +1014,46 @@ xfs_reclaim_inodes_count(
return reclaimable;
}
+STATIC int
+xfs_inode_free_eofblocks(
+ struct xfs_inode *ip,
+ struct xfs_perag *pag,
+ int flags,
+ void *args)
+{
+ int ret;
+ bool force = flags & SYNC_WAIT;
+
+ if (!xfs_can_free_eofblocks(ip, false)) {
+ /* inode could be preallocated or append-only */
+ trace_xfs_inode_free_eofblocks_invalid(ip);
+ xfs_inode_clear_eofblocks_tag(ip);
+ return 0;
+ }
+
+ if (!force && mapping_tagged(VFS_I(ip)->i_mapping,
+ PAGECACHE_TAG_DIRTY))
+ return 0;
+
+ ret = xfs_free_eofblocks(ip->i_mount, ip, false);
+
+ /* ignore EAGAIN on a best effort scan */
+ if (!force && (ret == EAGAIN))
+ ret = 0;
+
+ return ret;
+}
+
+int
+xfs_inodes_free_eofblocks(
+ struct xfs_mount *mp,
+ int flags)
+{
+ ASSERT((flags & ~(SYNC_TRYLOCK|SYNC_WAIT)) == 0);
+ return xfs_inode_ag_iterator_tag(mp, xfs_inode_free_eofblocks, flags,
+ NULL, XFS_ICI_EOFBLOCKS_TAG);
+}
+
void
xfs_inode_set_eofblocks_tag(
xfs_inode_t *ip)
diff --git a/fs/xfs/xfs_sync.h b/fs/xfs/xfs_sync.h
index 463ea0a..307654a 100644
--- a/fs/xfs/xfs_sync.h
+++ b/fs/xfs/xfs_sync.h
@@ -45,6 +45,7 @@ void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
void xfs_inode_set_eofblocks_tag(struct xfs_inode *ip);
void xfs_inode_clear_eofblocks_tag(struct xfs_inode *ip);
+int xfs_inodes_free_eofblocks(struct xfs_mount *, int);
int xfs_sync_inode_grab(struct xfs_inode *ip);
int xfs_inode_ag_iterator(struct xfs_mount *mp,
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 6f46e03..cb52346 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -589,6 +589,7 @@ DEFINE_INODE_EVENT(xfs_dquot_dqdetach);
DEFINE_INODE_EVENT(xfs_inode_set_eofblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_clear_eofblocks_tag);
+DEFINE_INODE_EVENT(xfs_inode_free_eofblocks_invalid);
DECLARE_EVENT_CLASS(xfs_iref_class,
TP_PROTO(struct xfs_inode *ip, unsigned long caller_ip),
--
1.7.7.6
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