#include <linux/backing-dev.h>
#include <linux/capability.h>
#include <linux/sched.h>
+#include <linux/lockdep.h>
+#include <linux/slab.h>
#include <linux/configfs.h>
#include "configfs_internal.h"
+#ifdef CONFIG_LOCKDEP
+static struct lock_class_key default_group_class[MAX_LOCK_DEPTH];
+#endif
+
extern struct super_block * configfs_sb;
static const struct address_space_operations configfs_aops = {
};
static struct backing_dev_info configfs_backing_dev_info = {
+ .name = "configfs",
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static const struct inode_operations configfs_inode_operations ={
static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
{
inode->i_mode = mode;
- inode->i_uid = 0;
- inode->i_gid = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
}
{
struct inode * inode = new_inode(configfs_sb);
if (inode) {
- inode->i_blocks = 0;
inode->i_mapping->a_ops = &configfs_aops;
inode->i_mapping->backing_dev_info = &configfs_backing_dev_info;
inode->i_op = &configfs_inode_operations;
return inode;
}
+#ifdef CONFIG_LOCKDEP
+
+static void configfs_set_inode_lock_class(struct configfs_dirent *sd,
+ struct inode *inode)
+{
+ int depth = sd->s_depth;
+
+ if (depth > 0) {
+ if (depth <= ARRAY_SIZE(default_group_class)) {
+ lockdep_set_class(&inode->i_mutex,
+ &default_group_class[depth - 1]);
+ } else {
+ /*
+ * In practice the maximum level of locking depth is
+ * already reached. Just inform about possible reasons.
+ */
+ printk(KERN_INFO "configfs: Too many levels of inodes"
+ " for the locking correctness validator.\n");
+ printk(KERN_INFO "Spurious warnings may appear.\n");
+ }
+ }
+}
+
+#else /* CONFIG_LOCKDEP */
+
+static void configfs_set_inode_lock_class(struct configfs_dirent *sd,
+ struct inode *inode)
+{
+}
+
+#endif /* CONFIG_LOCKDEP */
+
int configfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
{
int error = 0;
struct inode *p_inode = dentry->d_parent->d_inode;
p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME;
}
+ configfs_set_inode_lock_class(sd, inode);
goto Proceed;
}
else
if (!sd->s_element)
continue;
if (!strcmp(configfs_get_name(sd), name)) {
+ spin_lock(&configfs_dirent_lock);
list_del_init(&sd->s_sibling);
+ spin_unlock(&configfs_dirent_lock);
configfs_drop_dentry(sd, dir);
configfs_put(sd);
break;