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kernfs: add exportfs operations

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Now we have the facilities to implement exportfs operations. The idea is
cgroup can export the fhandle info to userspace, then userspace uses
fhandle to find the cgroup name. Another example is userspace can get
fhandle for a cgroup and BPF uses the fhandle to filter info for the
cgroup.

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 11:49:51 -07:00 • committed by Jens Axboe
parent c53cd490b1
commit aa81882534
3 changed files with 70 additions and 1 deletions
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12
include/linux/kernfs.h
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@ -69,6 +69,12 @@ enum kernfs_root_flag {
* following flag enables that behavior.
*/
KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK = 0x0002,
/*
* The filesystem supports exportfs operation, so userspace can use
* fhandle to access nodes of the fs.
*/
KERNFS_ROOT_SUPPORT_EXPORTOP = 0x0004,
};
/* type-specific structures for kernfs_node union members */
@ -98,6 +104,12 @@ struct kernfs_elem_attr {
/* represent a kernfs node */
union kernfs_node_id {
struct {
/*
* blktrace will export this struct as a simplified 'struct
* fid' (which is a big data struction), so userspace can use
* it to find kernfs node. The layout must match the first two
* fields of 'struct fid' exactly.
*/
u32 ino;
u32 generation;
};