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kernfs: remove kernfs_addrm_cxt

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kernfs_addrm_cxt and the accompanying kernfs_addrm_start/finish() were
added because there were operations which should be performed outside
kernfs_mutex after adding and removing kernfs_nodes.  The necessary
operations were recorded in kernfs_addrm_cxt and performed by
kernfs_addrm_finish(); however, after the recent changes which
relocated deactivation and unmapping so that they're performed
directly during removal, the only operation kernfs_addrm_finish()
performs is kernfs_put(), which can be moved inside the removal path
too.

This patch moves the kernfs_put() of the base ref to __kernfs_remove()
and remove kernfs_addrm_cxt and kernfs_addrm_start/finish().

* kernfs_add_one() is updated to grab and release kernfs_mutex itself.
  sysfs_addrm_start/finish() invocations around it are removed from
  all users.

* __kernfs_remove() puts an unlinked node directly instead of chaining
  it to kernfs_addrm_cxt.  Its callers are updated to grab and release
  kernfs_mutex instead of calling kernfs_addrm_start/finish() around
  it.

v2: Rebased on top of "kernfs: associate a new kernfs_node with its
    parent on creation" which dropped @parent from kernfs_add_one().

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2014-02-03 14:02:58 -05:00 • committed by Greg Kroah-Hartman
parent ccf02aaf81
commit 988cd7afb3
5 changed files with 28 additions and 108 deletions
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11
fs/kernfs/kernfs-internal.h
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@ -44,13 +44,6 @@ static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
return kn->dir.root;
}
/*
* Context structure to be used while adding/removing nodes.
*/
struct kernfs_addrm_cxt {
struct kernfs_node *removed;
};
/*
* mount.c
*/
@ -100,9 +93,7 @@ extern const struct inode_operations kernfs_dir_iops;
struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
void kernfs_put_active(struct kernfs_node *kn);
void kernfs_addrm_start(struct kernfs_addrm_cxt *acxt);
int kernfs_add_one(struct kernfs_addrm_cxt *acxt, struct kernfs_node *kn);
void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt);
int kernfs_add_one(struct kernfs_node *kn);
struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
const char *name, umode_t mode,
unsigned flags);