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| author | Chris Mason <chris.mason@oracle.com> | 2008-02-01 14:51:59 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:00 -0400 |
| commit | 21a4989d26d5ce43aac452fd67be592463a5996d (patch) | |
| tree | 5e4c4829264dcae66917ead9625c64ef11646abe | |
| parent | 47e4bb988c853d9af79d76fc5135aee9eeffed77 (diff) | |
| download | linux-21a4989d26d5ce43aac452fd67be592463a5996d.tar.bz2 | |
Btrfs: Hash in the offset and owner for file extent backref keys
This makes searches for backrefs and backref insertion much more efficient
when there are many backrefs for a single extent
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent-tree.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 0fc8dfd58da9..8761aec59e37 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -397,13 +397,12 @@ static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); lenum = cpu_to_le64(ref_generation); low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); - -#if 0 - lenum = cpu_to_le64(owner); - low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); - lenum = cpu_to_le64(owner_offset); - low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); -#endif + if (owner >= BTRFS_FIRST_FREE_OBJECTID) { + lenum = cpu_to_le64(owner); + low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); + lenum = cpu_to_le64(owner_offset); + low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); + } return ((u64)high_crc << 32) | (u64)low_crc; } |