ext4: switch to ->iterate_shared()

Note that we need relax_dir() equivalent for directories
locked shared.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 9 insertions, 2 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 561d7308b393..5d00bf060254 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -266,7 +266,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
                         ctx->pos += ext4_rec_len_from_disk(de->rec_len,
                                                 sb->s_blocksize);
                 }
-                if ((ctx->pos < inode->i_size) && !dir_relax(inode))
+                if ((ctx->pos < inode->i_size) && !dir_relax_shared(inode))
                         goto done;
                 brelse(bh);
                 bh = NULL;
@@ -644,7 +644,7 @@ int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, void *buf,
 const struct file_operations ext4_dir_operations = {
         .llseek         = ext4_dir_llseek,
         .read           = generic_read_dir,
-        .iterate        = ext4_readdir,
+        .iterate_shared = ext4_readdir,
         .unlocked_ioctl = ext4_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = ext4_compat_ioctl,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3dc0258a2b64..e87245ac6941 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3134,6 +3134,13 @@ static inline bool dir_relax(struct inode *inode)
         return !IS_DEADDIR(inode);
 }
 
+static inline bool dir_relax_shared(struct inode *inode)
+{
+        inode_unlock_shared(inode);
+        inode_lock_shared(inode);
+        return !IS_DEADDIR(inode);
+}
+
 extern bool path_noexec(const struct path *path);
 extern void inode_nohighmem(struct inode *inode);