diff options
| author | Josef Bacik <jbacik@fusionio.com> | 2013-10-22 20:18:51 +0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-01-29 01:19:21 +0400 |
| commit | 16e7549f045d33b0c5b0ebf19d08439e9221d40c (patch) | |
| tree | a7f3c3bbe5fa0cf6bf821f3a26d8969647dfd20d /fs/btrfs/ctree.h | |
| parent | d8ec26d7f8287f5788a494f56e8814210f0e64be (diff) | |
| download | linux-16e7549f045d33b0c5b0ebf19d08439e9221d40c.tar.xz | |
Btrfs: incompatible format change to remove hole extents
Btrfs has always had these filler extent data items for holes in inodes. This
has made somethings very easy, like logging hole punches and sending hole
punches. However for large holey files these extent data items are pure
overhead. So add an incompatible feature to no longer add hole extents to
reduce the amount of metadata used by these sort of files. This has a few
changes for logging and send obviously since they will need to detect holes and
log/send the holes if there are any. I've tested this thoroughly with xfstests
and it doesn't cause any issues with and without the incompat format set.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 54ab86127f7a..8be78f7d57e1 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -521,6 +521,7 @@ struct btrfs_super_block { #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6) #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7) #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8) +#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9) #define BTRFS_FEATURE_COMPAT_SUPP 0ULL #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL @@ -532,7 +533,8 @@ struct btrfs_super_block { BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ BTRFS_FEATURE_INCOMPAT_RAID56 | \ BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ - BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA) + BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \ + BTRFS_FEATURE_INCOMPAT_NO_HOLES) /* * A leaf is full of items. offset and size tell us where to find @@ -3399,6 +3401,7 @@ static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, } int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); +int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, u64 time_seq); static inline int btrfs_next_old_item(struct btrfs_root *root, |