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btrfs: Add noinode_cache mount option

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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>
This commit is contained in:
Qu Wenruo
2014-01-13 13:36:06 +08:00
committed by Chris Mason
parent ade2e0b3ee
commit 3818aea275
4 changed files with 22 additions and 2 deletions
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fs/btrfs/transaction.c
+9
View File
@@ -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
*/