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| author |   Josef Bacik <jbacik@fb.com> | 2014-09-10 16:20:45 -0400 |
|---|---|---|
| committer |   Chris Mason <clm@fb.com> | 2014-09-17 13:38:24 -0700 |
| commit | dc046b10c8b7d4f40befe457acb82340bf8b0699 (patch) | |
| tree | 2659e92649b19df4cd54a65eabd34f961f8d57f8 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | Btrfs: add missing compression property remove in btrfs_ioctl_setflags (diff) | |
| download | linux-dev-dc046b10c8b7d4f40befe457acb82340bf8b0699.tar.xz linux-dev-dc046b10c8b7d4f40befe457acb82340bf8b0699.zip | |
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 'tools/perf/scripts/python/call-graph-from-postgresql.py')
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