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authorQu Wenruo <quwenruo@cn.fujitsu.com>2014-01-13 13:36:06 +0800
committerChris Mason <clm@fb.com>2014-01-28 13:20:33 -0800
commit3818aea275423236db38a2d2d0a4951bc6da2e01 (patch)
tree8f6c5e005a8be46049554306acf32786eb3c7d32 /fs/btrfs/transaction.c
parentade2e0b3eeca941a5cd486bac21599ff87f288c8 (diff)
btrfs: Add noinode_cache mount option
Add noinode_cache mount option for btrfs. Since inode map cache involves all the btrfs_find_free_ino/return_ino things and if just trigger the mount_opt, an inode number get from inode map cache will not returned to inode map cache. To keep the find and return inode both in the same behavior, a new bit in mount_opt, CHANGE_INODE_CACHE, is introduced for this idea. CHANGE_INODE_CACHE is set/cleared in remounting, and the original INODE_MAP_CACHE is set/cleared according to CHANGE_INODE_CACHE after a success transaction. Since find/return inode is all done between btrfs_start_transaction and btrfs_commit_transaction, this will keep consistent behavior. Also noinode_cache mount option will not stop the caching_kthread. Cc: David Sterba <dsterba@suse.cz> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 5e2bfdaf8d14..34cd83184c4a 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1826,6 +1826,15 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
goto cleanup_transaction;
}
+ /*
+ * Since the transaction is done, we should set the inode map cache flag
+ * before any other comming transaction.
+ */
+ if (btrfs_test_opt(root, CHANGE_INODE_CACHE))
+ btrfs_set_opt(root->fs_info->mount_opt, INODE_MAP_CACHE);
+ else
+ btrfs_clear_opt(root->fs_info->mount_opt, INODE_MAP_CACHE);
+
/* commit_fs_roots gets rid of all the tree log roots, it is now
* safe to free the root of tree log roots
*/