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kernfs: Rename kernfs_put_open_node to kernfs_unlink_open_file.

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Since we are no longer using refcnt for kernfs_open_node instances, rename
kernfs_put_open_node to kernfs_unlink_open_file to reflect this change.
Also update function description and inline comments accordingly.

Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
Link: https://lore.kernel.org/r/20220504095123.295859-2-imran.f.khan@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Imran Khan 2022-05-04 19:51:19 +10:00 committed by Greg Kroah-Hartman
parent d143b9db80
commit c1b1352f21
1 changed files with 19 additions and 9 deletions
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28
fs/kernfs/file.c
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@ -552,18 +552,19 @@ static int kernfs_get_open_node(struct kernfs_node *kn,
}
/**
* kernfs_put_open_node - put kernfs_open_node
* kernfs_unlink_open_file - Unlink @of from @kn.
*
* @kn: target kernfs_node
* @of: associated kernfs_open_file
*
* Put @kn->attr.open and unlink @of from the files list. If
* list of associated open files becomes empty, disassociate and
* free kernfs_open_node.
* Unlink @of from list of @kn's associated open files. If list of
* associated open files becomes empty, disassociate and free
* kernfs_open_node.
*
* LOCKING:
* None.
*/
static void kernfs_put_open_node(struct kernfs_node *kn,
static void kernfs_unlink_open_file(struct kernfs_node *kn,
struct kernfs_open_file *of)
{
struct kernfs_open_node *on = kn->attr.open;
@ -703,7 +704,7 @@ static int kernfs_fop_open(struct inode *inode, struct file *file)
return 0;
err_put_node:
kernfs_put_open_node(kn, of);
kernfs_unlink_open_file(kn, of);
err_seq_release:
seq_release(inode, file);
err_free:
@ -749,7 +750,7 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp)
mutex_unlock(&kernfs_open_file_mutex);
}
kernfs_put_open_node(kn, of);
kernfs_unlink_open_file(kn, of);
seq_release(inode, filp);
kfree(of->prealloc_buf);
kfree(of);
@ -765,8 +766,15 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
if (!(kn->flags & (KERNFS_HAS_MMAP | KERNFS_HAS_RELEASE)))
return;
on = kn->attr.open;
if (!on)
/*
* lockless opportunistic check is safe below because no one is adding to
* ->attr.open at this point of time. This check allows early bail out
* if ->attr.open is already NULL. kernfs_unlink_open_file makes
* ->attr.open NULL only while holding kernfs_open_file_mutex so below
* check under kernfs_open_file_mutex will ensure bailing out if
* ->attr.open became NULL while waiting for the mutex.
*/
if (!kn->attr.open)
return;
mutex_lock(&kernfs_open_file_mutex);
@ -775,6 +783,8 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
return;
}
on = kn->attr.open;
list_for_each_entry(of, &on->files, list) {
struct inode *inode = file_inode(of->file);