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authorDave Chinner <dchinner@redhat.com>2013-08-30 10:23:44 +1000
committerBen Myers <bpm@sgi.com>2013-09-10 10:26:47 -0500
commit21b5c9784bceb8b8e0095f87355f3b138ebac2d0 (patch)
tree52b179280cb81bba1d7304a41676ed64d847067a /fs/xfs/xfs_log_format.h
parent0f295a214bb7658ca37bd61a8a1f0cd4a9d86c1f (diff)
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xfs: swap extents operations for CRC filesystems
For CRC enabled filesystems, we can't just swap inode forks from one inode to another when defragmenting a file - the blocks in the inode fork bmap btree contain pointers back to the owner inode. Hence if we are to swap the inode forks we have to atomically modify every block in the btree during the transaction. We are doing an entire fork swap here, so we could create a new transaction item type that indicates we are changing the owner of a certain structure from one value to another. If we combine this with ordered buffer logging to modify all the buffers in the tree, then we can change the buffers in the tree without needing log space for the operation. However, this then requires log recovery to perform the modification of the owner information of the objects/structures in question. This does introduce some interesting ordering details into recovery: we have to make sure that the owner change replay occurs after the change that moves the objects is made, not before. Hence we can't use a separate log item for this as we have no guarantee of strict ordering between multiple items in the log due to the relogging action of asynchronous transaction commits. Hence there is no "generic" method we can use for changing the ownership of arbitrary metadata structures. For inode forks, however, there is a simple method of communicating that the fork contents need the owner rewritten - we can pass a inode log format flag for the fork for the transaction that does a fork swap. This flag will then follow the inode fork through relogging actions so when the swap actually gets replayed the ownership can be changed immediately by log recovery. So that gives us a simple method of "whole fork" exchange between two inodes. This is relatively simple to implement, so it makes sense to do this as an initial implementation to support xfs_fsr on CRC enabled filesytems in the same manner as we do on existing filesystems. This commit introduces the swapext driven functionality, the recovery functionality will be in a separate patch. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_log_format.h')
-rw-r--r--fs/xfs/xfs_log_format.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log_format.h b/fs/xfs/xfs_log_format.h
index 31e3a06c4644..08a6fbe03bb6 100644
--- a/fs/xfs/xfs_log_format.h
+++ b/fs/xfs/xfs_log_format.h
@@ -474,6 +474,7 @@ typedef struct xfs_inode_log_format_64 {
#define XFS_ILOG_ADATA 0x040 /* log i_af.if_data */
#define XFS_ILOG_AEXT 0x080 /* log i_af.if_extents */
#define XFS_ILOG_ABROOT 0x100 /* log i_af.i_broot */
+#define XFS_ILOG_OWNER 0x200 /* change the extent tree owner on replay */
/*