[PATCH 05/13] sysfs: refactor sysfs_add_file_mode_ns
From: Christoph Hellwig <hch@lst.de>
Date: 2021-09-13 05:47:54
Also in:
linux-fsdevel, linux-xfs, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, filesystems (vfs and infrastructure), the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Alexander Viro, Christian Brauner, Linus Torvalds
Regroup the code so that preallocated attributes and normal attributes are handled in clearly separate blocks. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/sysfs/file.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index f737bd61f71bf..74a2a8021c8bb 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c@@ -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
--
2.30.2