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| author | Ilya Dryomov <idryomov@gmail.com> | 2012-01-16 22:04:48 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2012-01-16 22:04:48 +0200 |
| commit | ea67176ae8c024f64d85ec33873e5eadf1af7247 (patch) | |
| tree | d3674d6a4807074dbaadfdd260e2aaa3011eab5e /fs/btrfs | |
| parent | 94e60d5a5c4b98a32b1077dec88df09ada712376 (diff) | |
| download | lwn-ea67176ae8c024f64d85ec33873e5eadf1af7247.tar.gz lwn-ea67176ae8c024f64d85ec33873e5eadf1af7247.zip | |
Btrfs: virtual address space subset filter
Select chunks which have at least one byte located inside a given
[vstart, vend) virtual address space range.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/volumes.c | 20 | ||||
| -rw-r--r-- | fs/btrfs/volumes.h | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index c60071a448a5..e86c9e4fe51e 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2207,6 +2207,20 @@ static int chunk_drange_filter(struct extent_buffer *leaf, return 1; } +/* [vstart, vend) */ +static int chunk_vrange_filter(struct extent_buffer *leaf, + struct btrfs_chunk *chunk, + u64 chunk_offset, + struct btrfs_balance_args *bargs) +{ + if (chunk_offset < bargs->vend && + chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) + /* at least part of the chunk is inside this vrange */ + return 0; + + return 1; +} + static int should_balance_chunk(struct btrfs_root *root, struct extent_buffer *leaf, struct btrfs_chunk *chunk, u64 chunk_offset) @@ -2252,6 +2266,12 @@ static int should_balance_chunk(struct btrfs_root *root, return 0; } + /* vrange filter */ + if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && + chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { + return 0; + } + return 1; } diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 844b08e388f2..eac26c359312 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -203,6 +203,7 @@ struct map_lookup { #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) +#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) struct btrfs_balance_args; struct btrfs_balance_control { |