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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-28 12:41:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-28 12:41:28 -0700
commit266d17a8c0d857a579813ad185cd1640b0d6ccac (patch)
tree5a35b668f26bc93cbcf0c867d38203692aaf7f92 /fs
parent02e2af20f4f9f2aa0c84e9a30a35c02f0fbb7daa (diff)
parent88d99e870143199ba5bf42701dca06ce1d1388f0 (diff)
downloadlwn-266d17a8c0d857a579813ad185cd1640b0d6ccac.tar.gz
lwn-266d17a8c0d857a579813ad185cd1640b0d6ccac.zip
Merge tag 'driver-core-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH: "Here is the set of driver core changes for 5.18-rc1. Not much here, primarily it was a bunch of cleanups and small updates: - kobj_type cleanups for default_groups - documentation updates - firmware loader minor changes - component common helper added and take advantage of it in many drivers (the largest part of this pull request). All of these have been in linux-next for a while with no reported problems" * tag 'driver-core-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (54 commits) Documentation: update stable review cycle documentation drivers/base/dd.c : Remove the initial value of the global variable Documentation: update stable tree link Documentation: add link to stable release candidate tree devres: fix typos in comments Documentation: add note block surrounding security patch note samples/kobject: Use sysfs_emit instead of sprintf base: soc: Make soc_device_match() simpler and easier to read driver core: dd: fix return value of __setup handler driver core: Refactor sysfs and drv/bus remove hooks driver core: Refactor multiple copies of device cleanup scripts: get_abi.pl: Fix typo in help message kernfs: fix typos in comments kernfs: remove unneeded #if 0 guard ALSA: hda/realtek: Make use of the helper component_compare_dev_name video: omapfb: dss: Make use of the helper component_compare_dev power: supply: ab8500: Make use of the helper component_compare_dev ASoC: codecs: wcd938x: Make use of the helper component_compare/release_of iommu/mediatek: Make use of the helper component_compare/release_of drm: of: Make use of the helper component_release_of ...
Diffstat (limited to 'fs')
-rw-r--r--fs/debugfs/inode.c10
-rw-r--r--fs/kernfs/dir.c9
-rw-r--r--fs/kernfs/file.c2
-rw-r--r--fs/kernfs/kernfs-internal.h19
-rw-r--r--fs/sysfs/mount.c2
-rw-r--r--fs/ubifs/sysfs.c3
6 files changed, 41 insertions, 4 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 2f117c57160d..3dcf0b8b4e93 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -450,6 +450,11 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode,
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned.
+ *
+ * NOTE: it's expected that most callers should _ignore_ the errors returned
+ * by this function. Other debugfs functions handle the fact that the "dentry"
+ * passed to them could be an error and they don't crash in that case.
+ * Drivers should generally work fine even if debugfs fails to init anyway.
*/
struct dentry *debugfs_create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
@@ -551,6 +556,11 @@ EXPORT_SYMBOL_GPL(debugfs_create_file_size);
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned.
+ *
+ * NOTE: it's expected that most callers should _ignore_ the errors returned
+ * by this function. Other debugfs functions handle the fact that the "dentry"
+ * passed to them could be an error and they don't crash in that case.
+ * Drivers should generally work fine even if debugfs fails to init anyway.
*/
struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
{
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index e6d9772ddb4c..61a8edc4ba8b 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -971,6 +971,15 @@ void kernfs_destroy_root(struct kernfs_root *root)
}
/**
+ * kernfs_root_to_node - return the kernfs_node associated with a kernfs_root
+ * @root: root to use to lookup
+ */
+struct kernfs_node *kernfs_root_to_node(struct kernfs_root *root)
+{
+ return root->kn;
+}
+
+/**
* kernfs_create_dir_ns - create a directory
* @parent: parent in which to create a new directory
* @name: name of the new directory
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 9414a7a60a9f..74067a73ff78 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -1002,7 +1002,7 @@ struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent,
#endif
/*
- * kn->attr.ops is accesible only while holding active ref. We
+ * kn->attr.ops is accessible only while holding active ref. We
* need to know whether some ops are implemented outside active
* ref. Cache their existence in flags.
*/
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index f9cc912c31e1..eeaa779b929c 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -31,6 +31,24 @@ struct kernfs_iattrs {
atomic_t user_xattr_size;
};
+struct kernfs_root {
+ /* published fields */
+ struct kernfs_node *kn;
+ unsigned int flags; /* KERNFS_ROOT_* flags */
+
+ /* private fields, do not use outside kernfs proper */
+ struct idr ino_idr;
+ u32 last_id_lowbits;
+ u32 id_highbits;
+ struct kernfs_syscall_ops *syscall_ops;
+
+ /* list of kernfs_super_info of this root, protected by kernfs_rwsem */
+ struct list_head supers;
+
+ wait_queue_head_t deactivate_waitq;
+ struct rw_semaphore kernfs_rwsem;
+};
+
/* +1 to avoid triggering overflow warning when negating it */
#define KN_DEACTIVATED_BIAS (INT_MIN + 1)
@@ -122,7 +140,6 @@ int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
/*
* dir.c
*/
-extern struct rw_semaphore kernfs_rwsem;
extern const struct dentry_operations kernfs_dops;
extern const struct file_operations kernfs_dir_fops;
extern const struct inode_operations kernfs_dir_iops;
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index e747c135c1d1..98467bb76737 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -103,7 +103,7 @@ int __init sysfs_init(void)
if (IS_ERR(sysfs_root))
return PTR_ERR(sysfs_root);
- sysfs_root_kn = sysfs_root->kn;
+ sysfs_root_kn = kernfs_root_to_node(sysfs_root);
err = register_filesystem(&sysfs_fs_type);
if (err) {
diff --git a/fs/ubifs/sysfs.c b/fs/ubifs/sysfs.c
index 7acc5a74e5fa..06ad8fa1fcfb 100644
--- a/fs/ubifs/sysfs.c
+++ b/fs/ubifs/sysfs.c
@@ -42,6 +42,7 @@ static struct attribute *ubifs_attrs[] = {
ATTR_LIST(errors_crc),
NULL,
};
+ATTRIBUTE_GROUPS(ubifs);
static ssize_t ubifs_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
@@ -74,7 +75,7 @@ static const struct sysfs_ops ubifs_attr_ops = {
};
static struct kobj_type ubifs_sb_ktype = {
- .default_attrs = ubifs_attrs,
+ .default_groups = ubifs_groups,
.sysfs_ops = &ubifs_attr_ops,
.release = ubifs_sb_release,
};