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author | Dennis Zhou (Facebook) <dennisszhou@gmail.com> | 2018-09-11 14:41:27 -0400 |
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committer | Jens Axboe <axboe@kernel.dk> | 2018-09-21 20:29:03 -0600 |
commit | 49f4c2dc2b5066e9211101c59cc0828e81d41614 (patch) | |
tree | 217391585a20535d3c2606d98659786bf73682e2 /block/bio.c | |
parent | 27e6fa996c534c32702aa4d32db0ffa383acd050 (diff) | |
download | linux-49f4c2dc2b5066e9211101c59cc0828e81d41614.tar.bz2 |
blkcg: update blkg_lookup_create to do locking
To know when to create a blkg, the general pattern is to do a
blkg_lookup and if that fails, lock and then do a lookup again and if
that fails finally create. It doesn't make much sense for everyone who
wants to do creation to write this themselves.
This changes blkg_lookup_create to do locking and implement this
pattern. The old blkg_lookup_create is renamed to __blkg_lookup_create.
If a call site wants to do its own error handling or already owns the
queue lock, they can use __blkg_lookup_create. This will be used in
upcoming patches.
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bio.c')
0 files changed, 0 insertions, 0 deletions