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-rw-r--r--fs/sysfs/file.c140
1 files changed, 75 insertions, 65 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index d019d6ac6ad0..42dcf96881b6 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -45,6 +45,9 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
ssize_t count;
char *buf;
+ if (WARN_ON_ONCE(!ops->show))
+ return -EINVAL;
+
/* acquire buffer and ensure that it's >= PAGE_SIZE and clear */
count = seq_get_buf(sf, &buf);
if (count < PAGE_SIZE) {
@@ -53,15 +56,9 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
}
memset(buf, 0, PAGE_SIZE);
- /*
- * Invoke show(). Control may reach here via seq file lseek even
- * if @ops->show() isn't implemented.
- */
- if (ops->show) {
- count = ops->show(kobj, of->kn->priv, buf);
- if (count < 0)
- return count;
- }
+ count = ops->show(kobj, of->kn->priv, buf);
+ if (count < 0)
+ return count;
/*
* The code works fine with PAGE_SIZE return but it's likely to
@@ -255,59 +252,74 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap = {
};
int sysfs_add_file_mode_ns(struct kernfs_node *parent,
- const struct attribute *attr, bool is_bin,
- umode_t mode, kuid_t uid, kgid_t gid, const void *ns)
+ const struct attribute *attr, umode_t mode, kuid_t uid,
+ kgid_t gid, const void *ns)
{
+ 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;
- loff_t size;
-
- if (!is_bin) {
- struct kobject *kobj = parent->priv;
- const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
-
- /* every kobject with an attribute needs a ktype assigned */
- if (WARN(!sysfs_ops, KERN_ERR
- "missing sysfs attribute operations for kobject: %s\n",
- kobject_name(kobj)))
- return -EINVAL;
-
- if (sysfs_ops->show && sysfs_ops->store) {
- if (mode & SYSFS_PREALLOC)
- ops = &sysfs_prealloc_kfops_rw;
- else
- ops = &sysfs_file_kfops_rw;
- } else if (sysfs_ops->show) {
- if (mode & SYSFS_PREALLOC)
- ops = &sysfs_prealloc_kfops_ro;
- else
- ops = &sysfs_file_kfops_ro;
- } else if (sysfs_ops->store) {
- if (mode & SYSFS_PREALLOC)
- ops = &sysfs_prealloc_kfops_wo;
- else
- ops = &sysfs_file_kfops_wo;
- } else
- ops = &sysfs_file_kfops_empty;
-
- size = PAGE_SIZE;
+
+ /* every kobject with an attribute needs a ktype assigned */
+ if (WARN(!sysfs_ops, KERN_ERR
+ "missing sysfs attribute operations for kobject: %s\n",
+ kobject_name(kobj)))
+ return -EINVAL;
+
+ if (mode & SYSFS_PREALLOC) {
+ if (sysfs_ops->show && sysfs_ops->store)
+ ops = &sysfs_prealloc_kfops_rw;
+ else if (sysfs_ops->show)
+ ops = &sysfs_prealloc_kfops_ro;
+ else if (sysfs_ops->store)
+ ops = &sysfs_prealloc_kfops_wo;
} else {
- struct bin_attribute *battr = (void *)attr;
-
- if (battr->mmap)
- ops = &sysfs_bin_kfops_mmap;
- else if (battr->read && battr->write)
- ops = &sysfs_bin_kfops_rw;
- else if (battr->read)
- ops = &sysfs_bin_kfops_ro;
- else if (battr->write)
- ops = &sysfs_bin_kfops_wo;
- else
- ops = &sysfs_file_kfops_empty;
-
- size = battr->size;
+ 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;
+ }
+
+ if (!ops)
+ ops = &sysfs_file_kfops_empty;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ if (!attr->ignore_lockdep)
+ key = attr->key ?: (struct lock_class_key *)&attr->skey;
+#endif
+
+ kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
+ PAGE_SIZE, ops, (void *)attr, ns, key);
+ if (IS_ERR(kn)) {
+ if (PTR_ERR(kn) == -EEXIST)
+ sysfs_warn_dup(parent, attr->name);
+ return PTR_ERR(kn);
}
+ return 0;
+}
+
+int sysfs_add_bin_file_mode_ns(struct kernfs_node *parent,
+ const struct bin_attribute *battr, umode_t mode,
+ kuid_t uid, kgid_t gid, const void *ns)
+{
+ const struct attribute *attr = &battr->attr;
+ struct lock_class_key *key = NULL;
+ const struct kernfs_ops *ops;
+ struct kernfs_node *kn;
+
+ if (battr->mmap)
+ ops = &sysfs_bin_kfops_mmap;
+ else if (battr->read && battr->write)
+ ops = &sysfs_bin_kfops_rw;
+ else if (battr->read)
+ ops = &sysfs_bin_kfops_ro;
+ else if (battr->write)
+ ops = &sysfs_bin_kfops_wo;
+ else
+ ops = &sysfs_file_kfops_empty;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
if (!attr->ignore_lockdep)
@@ -315,7 +327,7 @@ int sysfs_add_file_mode_ns(struct kernfs_node *parent,
#endif
kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
- size, ops, (void *)attr, ns, key);
+ battr->size, ops, (void *)attr, ns, key);
if (IS_ERR(kn)) {
if (PTR_ERR(kn) == -EEXIST)
sysfs_warn_dup(parent, attr->name);
@@ -340,9 +352,7 @@ int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
return -EINVAL;
kobject_get_ownership(kobj, &uid, &gid);
- return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode,
- uid, gid, ns);
-
+ return sysfs_add_file_mode_ns(kobj->sd, attr, attr->mode, uid, gid, ns);
}
EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
@@ -385,8 +395,8 @@ int sysfs_add_file_to_group(struct kobject *kobj,
return -ENOENT;
kobject_get_ownership(kobj, &uid, &gid);
- error = sysfs_add_file_mode_ns(parent, attr, false,
- attr->mode, uid, gid, NULL);
+ error = sysfs_add_file_mode_ns(parent, attr, attr->mode, uid, gid,
+ NULL);
kernfs_put(parent);
return error;
@@ -555,8 +565,8 @@ int sysfs_create_bin_file(struct kobject *kobj,
return -EINVAL;
kobject_get_ownership(kobj, &uid, &gid);
- return sysfs_add_file_mode_ns(kobj->sd, &attr->attr, true,
- attr->attr.mode, uid, gid, NULL);
+ return sysfs_add_bin_file_mode_ns(kobj->sd, attr, attr->attr.mode, uid,
+ gid, NULL);
}
EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.