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| author | Tejun Heo | 2014-02-03 20:09:15 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2014-02-08 01:00:41 +0100 |
| commit | 0c23b2259a4850494e2c53e864ea840597c6cdd3 (patch) | |
| tree | f4d061ea433e443edd43d1f0a186e06aeb2ed95e /fs/kernfs/dir.c | |
| parent | kernfs: add kernfs_open_file->priv (diff) | |
| download | kernel-qcow2-linux-0c23b2259a4850494e2c53e864ea840597c6cdd3.tar.gz kernel-qcow2-linux-0c23b2259a4850494e2c53e864ea840597c6cdd3.tar.xz kernel-qcow2-linux-0c23b2259a4850494e2c53e864ea840597c6cdd3.zip | |
kernfs: implement kernfs_node_from_dentry(), kernfs_root_from_sb() and kernfs_rename()
Implement helpers to determine node from dentry and root from
super_block. Also add a kernfs_rename_ns() wrapper which assumes NULL
namespace. These generally make sense and will be used by cgroup.
v2: Some dummy implementations for !CONFIG_SYSFS was missing. Fixed.
Reported by kbuild test robot.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs/dir.c')
| -rw-r--r-- | fs/kernfs/dir.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 3cff0a233cd1..42a250f83b98 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -350,6 +350,24 @@ const struct dentry_operations kernfs_dops = { .d_release = kernfs_dop_release, }; +/** + * kernfs_node_from_dentry - determine kernfs_node associated with a dentry + * @dentry: the dentry in question + * + * Return the kernfs_node associated with @dentry. If @dentry is not a + * kernfs one, %NULL is returned. + * + * While the returned kernfs_node will stay accessible as long as @dentry + * is accessible, the returned node can be in any state and the caller is + * fully responsible for determining what's accessible. + */ +struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry) +{ + if (dentry->d_op == &kernfs_dops) + return dentry->d_fsdata; + return NULL; +} + static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root, const char *name, umode_t mode, unsigned flags) |