*/
#ifdef CONFIG_SYSCTL
int proc_nr_inodes(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
inodes_stat.nr_inodes = get_nr_inodes();
inodes_stat.nr_unused = get_nr_inodes_unused();
spin_lock(&inode_hash_lock);
spin_lock(&inode->i_lock);
- hlist_add_head(&inode->i_hash, b);
+ hlist_add_head_rcu(&inode->i_hash, b);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_hash_lock);
}
{
spin_lock(&inode_hash_lock);
spin_lock(&inode->i_lock);
- hlist_del_init(&inode->i_hash);
+ hlist_del_init_rcu(&inode->i_hash);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_hash_lock);
}
*/
spin_lock(&inode->i_lock);
inode->i_state |= I_NEW;
- hlist_add_head(&inode->i_hash, head);
+ hlist_add_head_rcu(&inode->i_hash, head);
spin_unlock(&inode->i_lock);
if (!creating)
inode_sb_list_add(inode);
inode->i_ino = ino;
spin_lock(&inode->i_lock);
inode->i_state = I_NEW;
- hlist_add_head(&inode->i_hash, head);
+ hlist_add_head_rcu(&inode->i_hash, head);
spin_unlock(&inode->i_lock);
inode_sb_list_add(inode);
spin_unlock(&inode_hash_lock);
struct hlist_head *b = inode_hashtable + hash(sb, ino);
struct inode *inode;
- spin_lock(&inode_hash_lock);
- hlist_for_each_entry(inode, b, i_hash) {
- if (inode->i_ino == ino && inode->i_sb == sb) {
- spin_unlock(&inode_hash_lock);
+ hlist_for_each_entry_rcu(inode, b, i_hash) {
+ if (inode->i_ino == ino && inode->i_sb == sb)
return 0;
- }
}
- spin_unlock(&inode_hash_lock);
-
return 1;
}
static unsigned int counter;
ino_t res;
+ rcu_read_lock();
spin_lock(&iunique_lock);
do {
if (counter <= max_reserved)
res = counter++;
} while (!test_inode_iunique(sb, res));
spin_unlock(&iunique_lock);
+ rcu_read_unlock();
return res;
}
}
EXPORT_SYMBOL(find_inode_nowait);
+/**
+ * find_inode_rcu - find an inode in the inode cache
+ * @sb: Super block of file system to search
+ * @hashval: Key to hash
+ * @test: Function to test match on an inode
+ * @data: Data for test function
+ *
+ * Search for the inode specified by @hashval and @data in the inode cache,
+ * where the helper function @test will return 0 if the inode does not match
+ * and 1 if it does. The @test function must be responsible for taking the
+ * i_lock spin_lock and checking i_state for an inode being freed or being
+ * initialized.
+ *
+ * If successful, this will return the inode for which the @test function
+ * returned 1 and NULL otherwise.
+ *
+ * The @test function is not permitted to take a ref on any inode presented.
+ * It is also not permitted to sleep.
+ *
+ * The caller must hold the RCU read lock.
+ */
+struct inode *find_inode_rcu(struct super_block *sb, unsigned long hashval,
+ int (*test)(struct inode *, void *), void *data)
+{
+ struct hlist_head *head = inode_hashtable + hash(sb, hashval);
+ struct inode *inode;
+
+ RCU_LOCKDEP_WARN(!rcu_read_lock_held(),
+ "suspicious find_inode_rcu() usage");
+
+ hlist_for_each_entry_rcu(inode, head, i_hash) {
+ if (inode->i_sb == sb &&
+ !(READ_ONCE(inode->i_state) & (I_FREEING | I_WILL_FREE)) &&
+ test(inode, data))
+ return inode;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(find_inode_rcu);
+
+/**
+ * find_inode_by_rcu - Find an inode in the inode cache
+ * @sb: Super block of file system to search
+ * @ino: The inode number to match
+ *
+ * Search for the inode specified by @hashval and @data in the inode cache,
+ * where the helper function @test will return 0 if the inode does not match
+ * and 1 if it does. The @test function must be responsible for taking the
+ * i_lock spin_lock and checking i_state for an inode being freed or being
+ * initialized.
+ *
+ * If successful, this will return the inode for which the @test function
+ * returned 1 and NULL otherwise.
+ *
+ * The @test function is not permitted to take a ref on any inode presented.
+ * It is also not permitted to sleep.
+ *
+ * The caller must hold the RCU read lock.
+ */
+struct inode *find_inode_by_ino_rcu(struct super_block *sb,
+ unsigned long ino)
+{
+ struct hlist_head *head = inode_hashtable + hash(sb, ino);
+ struct inode *inode;
+
+ RCU_LOCKDEP_WARN(!rcu_read_lock_held(),
+ "suspicious find_inode_by_ino_rcu() usage");
+
+ hlist_for_each_entry_rcu(inode, head, i_hash) {
+ if (inode->i_ino == ino &&
+ inode->i_sb == sb &&
+ !(READ_ONCE(inode->i_state) & (I_FREEING | I_WILL_FREE)))
+ return inode;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(find_inode_by_ino_rcu);
+
int insert_inode_locked(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
if (likely(!old)) {
spin_lock(&inode->i_lock);
inode->i_state |= I_NEW | I_CREATING;
- hlist_add_head(&inode->i_hash, head);
+ hlist_add_head_rcu(&inode->i_hash, head);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_hash_lock);
return 0;
{
struct super_block *sb = inode->i_sb;
const struct super_operations *op = inode->i_sb->s_op;
+ unsigned long state;
int drop;
WARN_ON(inode->i_state & I_NEW);
return;
}
+ state = inode->i_state;
if (!drop) {
- inode->i_state |= I_WILL_FREE;
+ WRITE_ONCE(inode->i_state, state | I_WILL_FREE);
spin_unlock(&inode->i_lock);
+
write_inode_now(inode, 1);
+
spin_lock(&inode->i_lock);
- WARN_ON(inode->i_state & I_NEW);
- inode->i_state &= ~I_WILL_FREE;
+ state = inode->i_state;
+ WARN_ON(state & I_NEW);
+ state &= ~I_WILL_FREE;
}
- inode->i_state |= I_FREEING;
+ WRITE_ONCE(inode->i_state, state | I_FREEING);
if (!list_empty(&inode->i_lru))
inode_lru_list_del(inode);
spin_unlock(&inode->i_lock);
projects / linux-2.6-microblaze.git / blobdiff