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sysfs: refactor sysfs_add_file_mode_ns

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Regroup the code so that preallocated attributes and normal attributes are
handled in clearly separate blocks.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210913054121.616001-6-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2021-09-13 07:41:13 +02:00 committed by Greg Kroah-Hartman
parent 5cf3bb0d3a
commit d1a1a9606e
1 changed files with 14 additions and 13 deletions
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27
fs/sysfs/file.c
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@ -261,7 +261,7 @@ int sysfs_add_file_mode_ns(struct kernfs_node *parent,
struct kobject *kobj = parent->priv;
const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
struct lock_class_key *key = NULL;
const struct kernfs_ops *ops;
const struct kernfs_ops *ops = NULL;
struct kernfs_node *kn;
/* every kobject with an attribute needs a ktype assigned */
@ -270,22 +270,23 @@ int sysfs_add_file_mode_ns(struct kernfs_node *parent,
kobject_name(kobj)))
return -EINVAL;
if (sysfs_ops->show && sysfs_ops->store) {
if (mode & SYSFS_PREALLOC)
if (mode & SYSFS_PREALLOC) {
if (sysfs_ops->show && sysfs_ops->store)
ops = &sysfs_prealloc_kfops_rw;
else
ops = &sysfs_file_kfops_rw;
} else if (sysfs_ops->show) {
if (mode & SYSFS_PREALLOC)
else if (sysfs_ops->show)
ops = &sysfs_prealloc_kfops_ro;
else
ops = &sysfs_file_kfops_ro;
} else if (sysfs_ops->store) {
if (mode & SYSFS_PREALLOC)
else if (sysfs_ops->store)
ops = &sysfs_prealloc_kfops_wo;
else
} else {
if (sysfs_ops->show && sysfs_ops->store)
ops = &sysfs_file_kfops_rw;
else if (sysfs_ops->show)
ops = &sysfs_file_kfops_ro;
else if (sysfs_ops->store)
ops = &sysfs_file_kfops_wo;
} else
}
if (!ops)
ops = &sysfs_file_kfops_empty;
#ifdef CONFIG_DEBUG_LOCK_ALLOC