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| author | Chris Mason <chris.mason@oracle.com> | 2007-12-17 20:14:01 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:03:58 -0400 |
| commit | be20aa9dbadc8c06283784ee12bbc0d97dea3418 (patch) | |
| tree | 52bd8b7e21b36d10dbb48f8b163eea992c9cfd4a /fs/btrfs/ctree.h | |
| parent | b6cda9bcb4df7544c67fc3548a53bc1607d59f46 (diff) | |
| download | lwn-be20aa9dbadc8c06283784ee12bbc0d97dea3418.tar.gz lwn-be20aa9dbadc8c06283784ee12bbc0d97dea3418.zip | |
Btrfs: Add mount option to turn off data cow
A number of workloads do not require copy on write data or checksumming.
mount -o nodatasum to disable checksums and -o nodatacow to disable
both copy on write and checksumming.
In nodatacow mode, copy on write is still performed when a given extent
is under snapshot.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 5e255cabfd10..b51b021fff85 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -431,6 +431,7 @@ struct btrfs_root { #define BTRFS_STRING_ITEM_KEY 253 #define BTRFS_MOUNT_NODATASUM 0x1 +#define BTRFS_MOUNT_NODATACOW 0x2 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) @@ -915,6 +916,9 @@ static inline u32 btrfs_level_size(struct btrfs_root *root, int level) { btrfs_item_offset_nr(leaf, slot))) /* extent-tree.c */ +u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, + struct btrfs_path *count_path, + u64 first_extent); int btrfs_extent_post_op(struct btrfs_trans_handle *trans, struct btrfs_root *root); int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy); @@ -974,6 +978,10 @@ int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct extent_buffer *buf, struct extent_buffer *parent, int parent_slot, struct extent_buffer **cow_ret); +int btrfs_copy_root(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct extent_buffer *buf, + struct extent_buffer **cow_ret, u64 new_root_objectid); int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, u32 data_size); int btrfs_truncate_item(struct btrfs_trans_handle *trans, |