f2fs: allow readdir() to be interrupted

This patch follows ext4 to allow readdir() in large empty directory to
be interrupted. Referenced commit of ext4: 1f60fbe72749 ("ext4: allow
readdir()'s of large empty directories to be interrupted").

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 148927f5bc93984f51a52976652cb2cf918b8ad9..1ebd206a40858b214fcbbd64e7472a246bd463c6 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -10,6 +10,7 @@
  */
 #include <linux/fs.h>
 #include <linux/f2fs_fs.h>
+#include <linux/sched/signal.h>
 #include "f2fs.h"
 #include "node.h"
 #include "acl.h"
@@ -875,6 +876,14 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
                                min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
 
        for (; n < npages; n++) {
+
+               /* allow readdir() to be interrupted */
+               if (fatal_signal_pending(current)) {
+                       err = -ERESTARTSYS;
+                       goto out_free;
+               }
+               cond_resched();
+
                dentry_page = get_lock_data_page(inode, n, false);
                if (IS_ERR(dentry_page)) {
                        err = PTR_ERR(dentry_page);