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| author | Josef Bacik <josef@redhat.com> | 2010-06-21 14:48:16 -0400 |
|---|---|---|
| committer | Josef Bacik <josef@redhat.com> | 2010-10-28 15:59:09 -0400 |
| commit | 0af3d00bad38d3bb9912a60928ad0669f17bdb76 (patch) | |
| tree | abbf4c773138a33dcde483ac60f016c4b5e55dcc /fs/btrfs/transaction.h | |
| parent | f6f94e2ab1b33f0082ac22d71f66385a60d8157f (diff) | |
| download | lwn-0af3d00bad38d3bb9912a60928ad0669f17bdb76.tar.gz lwn-0af3d00bad38d3bb9912a60928ad0669f17bdb76.zip | |
Btrfs: create special free space cache inode
In order to save free space cache, we need an inode to hold the data, and we
need a special item to point at the right inode for the right block group. So
first, create a special item that will point to the right inode, and the number
of extent entries we will have and the number of bitmaps we will have. We
truncate and pre-allocate space everytime to make sure it's uptodate.
This feature will be turned on as soon as you mount with -o space_cache, however
it is safe to boot into old kernels, they will just generate the cache the old
fashion way. When you boot back into a newer kernel we will notice that we
modified and not the cache and automatically discard the cache.
Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs/transaction.h')
| -rw-r--r-- | fs/btrfs/transaction.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index e104986d0bfd..15f83e1c1ef7 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h @@ -87,10 +87,14 @@ static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, int btrfs_end_transaction(struct btrfs_trans_handle *trans, struct btrfs_root *root); +int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, + struct btrfs_root *root); struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, int num_items); struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, int num_blocks); +struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root, + int num_blocks); struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r, int num_blocks); int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |