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| author | Shaohua Li <shli@fb.com> | 2017-07-12 21:49:55 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-07-29 18:00:03 +0300 |
| commit | 69fd5c391763bd94a40dd152bc72a7f230137150 (patch) | |
| tree | 9f44111556c0f8ac14410703a79c42289ea768c2 /fs/kernfs | |
| parent | 007cc56b7eeca8848021bc43aca2b8607fbe5589 (diff) | |
| download | linux-69fd5c391763bd94a40dd152bc72a7f230137150.tar.xz | |
blktrace: add an option to allow displaying cgroup path
By default we output cgroup id in blktrace. This adds an option to
display cgroup path. Since get cgroup path is a relativly heavy
operation, we don't enable it by default.
with the option enabled, blktrace will output something like this:
dd-1353 [007] d..2 293.015252: 8,0 /test/level D R 24 + 8 [dd]
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/kernfs')
| -rw-r--r-- | fs/kernfs/mount.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index fa323589704f..7c452f4d83e9 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -65,6 +65,25 @@ const struct super_operations kernfs_sops = { .show_path = kernfs_sop_show_path, }; +/* + * Similar to kernfs_fh_get_inode, this one gets kernfs node from inode + * number and generation + */ +struct kernfs_node *kernfs_get_node_by_id(struct kernfs_root *root, + const union kernfs_node_id *id) +{ + struct kernfs_node *kn; + + kn = kernfs_find_and_get_node_by_ino(root, id->ino); + if (!kn) + return NULL; + if (kn->id.generation != id->generation) { + kernfs_put(kn); + return NULL; + } + return kn; +} + static struct inode *kernfs_fh_get_inode(struct super_block *sb, u64 ino, u32 generation) { |