[PATCH 1/2] erofs: allow readdir() to be interrupted

[Chao Yu]

In a quick slow device, readdir() may loop for long time in large
directory, let's give a chance to allow it to be interrupted by
userspace.

Signed-off-by: Chao Yu <chao at kernel.org>
---
 fs/erofs/dir.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c
index 2fae209d0274..cff61c5a172b 100644
--- a/fs/erofs/dir.c
+++ b/fs/erofs/dir.c
@@ -58,6 +58,13 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
 		struct erofs_dirent *de;
 		unsigned int nameoff, maxsize;
 
+		/* allow readdir() to be interrupted */
+		if (fatal_signal_pending(current)) {
+			err = -ERESTARTSYS;
+			break;
+		}
+		cond_resched();
+
 		de = erofs_bread(&buf, dbstart, true);
 		if (IS_ERR(de)) {
 			erofs_err(sb, "failed to readdir of logical block %llu of nid %llu",
-- 
2.49.0