diff mbox series

ceph: skip copying the data extends the file EOF

Message ID 20240221092925.89408-1-xiubli@redhat.com
State Superseded
Headers show
Series ceph: skip copying the data extends the file EOF | expand

Commit Message

Xiubo Li Feb. 21, 2024, 9:29 a.m. UTC 
From: Xiubo Li <xiubli@redhat.com>

If hits the EOF it will revise the return value to the i_size
instead of the real length read, but it will advance the offset
of iovc, then for the next try it may be incorrectly skipped.

This will just skip advancing the iovc's offset more than i_size.

URL: https://patchwork.kernel.org/project/ceph-devel/list/?series=819323
Reported-by: Frank Hsiao 蕭法宣 <frankhsiao@qnap.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/file.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 71d29571712d..2b2b07a0a61b 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1195,7 +1195,7 @@  ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 		}
 
 		idx = 0;
-		left = ret > 0 ? ret : 0;
+		left = ret > 0 ? umin(ret, i_size) : 0;
 		while (left > 0) {
 			size_t plen, copied;
 
@@ -1224,15 +1224,13 @@  ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 	}
 
 	if (ret > 0) {
-		if (off > *ki_pos) {
-			if (off >= i_size) {
-				*retry_op = CHECK_EOF;
-				ret = i_size - *ki_pos;
-				*ki_pos = i_size;
-			} else {
-				ret = off - *ki_pos;
-				*ki_pos = off;
-			}
+		if (off >= i_size) {
+			*retry_op = CHECK_EOF;
+			ret = i_size - *ki_pos;
+			*ki_pos = i_size;
+		} else {
+			ret = off - *ki_pos;
+			*ki_pos = off;
 		}
 
 		if (last_objver)