diff options
| author | Chris Mason <chris.mason@oracle.com> | 2009-06-09 20:28:34 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-06-10 11:29:52 -0400 |
| commit | 451d7585a8bb1b9bec0d676ce3dece1923164e55 (patch) | |
| tree | b4e9103b7010e45e02deff9ae4470df71475f8de /fs/btrfs/ctree.h | |
| parent | c604480171c510c1beeb81b82418e5bc4de8f1ae (diff) | |
Btrfs: add mount -o ssd_spread to spread allocations out
Some SSDs perform best when reusing block numbers often, while
others perform much better when clustering strictly allocates
big chunks of unused space.
The default mount -o ssd will find rough groupings of blocks
where there are a bunch of free blocks that might have some
allocated blocks mixed in.
mount -o ssd_spread will make sure there are no allocated blocks
mixed in. It should perform better on lower end SSDs.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index ce3ab4e1306..b9d8788b299 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1100,6 +1100,7 @@ struct btrfs_root { #define BTRFS_MOUNT_COMPRESS (1 << 5) #define BTRFS_MOUNT_NOTREELOG (1 << 6) #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) +#define BTRFS_MOUNT_SSD_SPREAD (1 << 8) #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) |