GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-28 17:41:50 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

kernfs: add an API to get kernfs node from inode number

Browse source 
Add an API to get kernfs node from inode number. We will need this to
implement exportfs operations.

This API will be used in blktrace too later, so it should be as fast as
possible. To make the API lock free, kernfs node is freed in RCU
context. And we depend on kernfs_node count/ino number to filter out
stale kernfs nodes.

Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li 2017-07-12 11:49:48 -07:00 • committed by Jens Axboe
parent 4a3ef68aca
commit ba16b2846a
3 changed files with 69 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

11
fs/kernfs/mount.c
View file

@ -330,7 +330,16 @@ struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns)
void __init kernfs_init(void)
{
/*
* the slab is freed in RCU context, so kernfs_find_and_get_node_by_ino
* can access the slab lock free. This could introduce stale nodes,
* please see how kernfs_find_and_get_node_by_ino filters out stale
* nodes.
*/
kernfs_node_cache = kmem_cache_create("kernfs_node_cache",
sizeof(struct kernfs_node),
0, SLAB_PANIC, NULL);
0,
SLAB_PANIC | SLAB_TYPESAFE_BY_RCU,
NULL);
}