[PATCH 56/63] xfs: set a default CoW extent size of 32 blocks

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



If the admin doesn't set a CoW extent size or a regular extent size
hint, default to creating CoW reservations 32 blocks long to reduce
fragmentation.

Signed-off-by: DarricK J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/xfs_inode.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)


diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 07c300b..a9fb223 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -80,7 +80,8 @@ xfs_get_extsz_hint(
 /*
  * Helper function to extract CoW extent size hint from inode.
  * Between the extent size hint and the CoW extent size hint, we
- * return the greater of the two.
+ * return the greater of the two.  If the value is zero (automatic),
+ * default to 32 blocks.
  */
 xfs_extlen_t
 xfs_get_cowextsz_hint(
@@ -93,9 +94,10 @@ xfs_get_cowextsz_hint(
 		a = ip->i_d.di_cowextsize;
 	b = xfs_get_extsz_hint(ip);
 
-	if (a > b)
-		return a;
-	return b;
+	a = max(a, b);
+	if (a == 0)
+		return 32;
+	return a;
 }
 
 /*

--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux