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Btrfs: Hash in the offset and owner for file extent backref keys

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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>
This commit is contained in:
Chris Mason 2008-02-01 14:51:59 -05:00
parent 47e4bb988c
commit 21a4989d26
1 changed files with 6 additions and 7 deletions
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13
fs/btrfs/extent-tree.c
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@ -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;
}