diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/kernfs/mount.c | 2 | ||||
| -rw-r--r-- | fs/sysfs/file.c | 27 |
2 files changed, 28 insertions, 1 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index e29f4edf9572..1358c21837f1 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -206,7 +206,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn, struct super_block *sb) { struct dentry *dentry; - struct kernfs_node *knparent = NULL; + struct kernfs_node *knparent; BUG_ON(sb->s_op != &kernfs_sops); diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 7cd64021d453..d1995e2d6c94 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -785,3 +785,30 @@ int sysfs_emit_at(char *buf, int at, const char *fmt, ...) return len; } EXPORT_SYMBOL_GPL(sysfs_emit_at); + +/** + * sysfs_bin_attr_simple_read - read callback to simply copy from memory. + * @file: attribute file which is being read. + * @kobj: object to which the attribute belongs. + * @attr: attribute descriptor. + * @buf: destination buffer. + * @off: offset in bytes from which to read. + * @count: maximum number of bytes to read. + * + * Simple ->read() callback for bin_attributes backed by a buffer in memory. + * The @private and @size members in struct bin_attribute must be set to the + * buffer's location and size before the bin_attribute is created in sysfs. + * + * Bounds check for @off and @count is done in sysfs_kf_bin_read(). + * Negative value check for @off is done in vfs_setpos() and default_llseek(). + * + * Returns number of bytes written to @buf. + */ +ssize_t sysfs_bin_attr_simple_read(struct file *file, struct kobject *kobj, + struct bin_attribute *attr, char *buf, + loff_t off, size_t count) +{ + memcpy(buf, attr->private + off, count); + return count; +} +EXPORT_SYMBOL_GPL(sysfs_bin_attr_simple_read); |