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authorDarrick J. Wong <darrick.wong@oracle.com>2016-10-03 09:11:46 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2016-10-05 16:26:28 -0700
commit83104d449e8c44e4870a795132437257cdf80006 (patch)
treeb121d0dc8b995abc636adad9adbfa723dcbb8f3e /fs/xfs/xfs_icache.h
parent90e2056d76adc7894a019f5289d259de58065e13 (diff)
downloadlinux-83104d449e8c44e4870a795132437257cdf80006.tar.bz2
xfs: garbage collect old cowextsz reservations
Trim CoW reservations made on behalf of a cowextsz hint if they get too old or we run low on quota, so long as we don't have dirty data awaiting writeback or directio operations in progress. Garbage collection of the cowextsize extents are kept separate from prealloc extent reaping because setting the CoW prealloc lifetime to a (much) higher value than the regular prealloc extent lifetime has been useful for combatting CoW fragmentation on VM hosts where the VMs experience bursty write behaviors and we can keep the utilization ratios low enough that we don't start to run out of space. IOWs, it benefits us to keep the CoW fork reservations around for as long as we can unless we run out of blocks or hit inode reclaim. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_icache.h')
-rw-r--r--fs/xfs/xfs_icache.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/xfs/xfs_icache.h b/fs/xfs/xfs_icache.h
index 05bac99bef75..a1e02f4708ab 100644
--- a/fs/xfs/xfs_icache.h
+++ b/fs/xfs/xfs_icache.h
@@ -40,6 +40,7 @@ struct xfs_eofblocks {
in xfs_inode_ag_iterator */
#define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */
#define XFS_ICI_EOFBLOCKS_TAG 1 /* inode has blocks beyond EOF */
+#define XFS_ICI_COWBLOCKS_TAG 2 /* inode can have cow blocks to gc */
/*
* Flags for xfs_iget()
@@ -70,6 +71,12 @@ int xfs_inode_free_quota_eofblocks(struct xfs_inode *ip);
void xfs_eofblocks_worker(struct work_struct *);
void xfs_queue_eofblocks(struct xfs_mount *);
+void xfs_inode_set_cowblocks_tag(struct xfs_inode *ip);
+void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip);
+int xfs_icache_free_cowblocks(struct xfs_mount *, struct xfs_eofblocks *);
+int xfs_inode_free_quota_cowblocks(struct xfs_inode *ip);
+void xfs_cowblocks_worker(struct work_struct *);
+
int xfs_inode_ag_iterator(struct xfs_mount *mp,
int (*execute)(struct xfs_inode *ip, int flags, void *args),
int flags, void *args);