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blktrace: add an option to allow displaying cgroup path

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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Shaohua Li 2017-07-12 11:49:55 -07:00 • committed by Jens Axboe
commit 69fd5c3917
5 changed files with 52 additions and 1 deletions
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19
fs/kernfs/mount.c
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@ -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)
{