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| author | Josef Bacik <jbacik@fb.com> | 2014-09-11 00:20:45 +0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-09-18 00:38:24 +0400 |
| commit | dc046b10c8b7d4f40befe457acb82340bf8b0699 (patch) | |
| tree | 2659e92649b19df4cd54a65eabd34f961f8d57f8 /kernel | |
| parent | 78a017a2c92df9b571db0a55a016280f9019c65e (diff) | |
| download | linux-dc046b10c8b7d4f40befe457acb82340bf8b0699.tar.xz | |
Btrfs: make fiemap not blow when you have lots of snapshots
We have been iterating all references for each extent we have in a file when we
do fiemap to see if it is shared. This is fine when you have a few clones or a
few snapshots, but when you have 5k snapshots suddenly fiemap just sits there
and stares at you. So add btrfs_check_shared which will use the backref walking
code but will short circuit as soon as it finds a root or inode that doesn't
match the one we currently have. This makes fiemap on my testbox go from
looking at me blankly for a day to spitting out actual output in a reasonable
amount of time. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions