[PATCH v2 3/4] ceph: return the real size readed when hit EOF

[xiubli@redhat.com]

From: Xiubo Li <xiubli@redhat.com>

Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/file.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 74db403a4c35..1988e75ad4a2 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -910,6 +910,7 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 	ssize_t ret;
 	u64 off = *ki_pos;
 	u64 len = iov_iter_count(to);
+	u64 i_size = i_size_read(inode);
 
 	dout("sync_read on inode %p %llu~%u\n", inode, *ki_pos, (unsigned)len);
 
@@ -933,7 +934,6 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 		struct page **pages;
 		int num_pages;
 		size_t page_off;
-		u64 i_size;
 		bool more;
 		int idx;
 		size_t left;
@@ -980,7 +980,6 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 
 		ceph_osdc_put_request(req);
 
-		i_size = i_size_read(inode);
 		dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
 		     off, len, ret, i_size, (more ? " MORE" : ""));
 
@@ -1056,11 +1055,14 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 	}
 
 	if (off > *ki_pos) {
-		if (ret >= 0 &&
-		    iov_iter_count(to) > 0 && off >= i_size_read(inode))
+		if (off >= i_size) {
 			*retry_op = CHECK_EOF;
-		ret = off - *ki_pos;
-		*ki_pos = off;
+			ret = i_size - *ki_pos;
+			*ki_pos = i_size;
+		} else {
+			ret = off - *ki_pos;
+			*ki_pos = off;
+		}
 	}
 out:
 	dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
-- 
2.27.0