CIFS: Fix rsize usage for sync read
If a server changes maximum buffer size for read requests (rsize)
on reconnect we can fail on repeating with a big size buffer on
-EAGAIN error in cifs_read. Fix this by checking rsize all the
time before repeating requests.
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index bbc3859..00b2a25 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3148,18 +3148,19 @@
for (total_read = 0, cur_offset = read_data; read_size > total_read;
total_read += bytes_read, cur_offset += bytes_read) {
- current_read_size = min_t(uint, read_size - total_read, rsize);
- /*
- * For windows me and 9x we do not want to request more than it
- * negotiated since it will refuse the read then.
- */
- if ((tcon->ses) && !(tcon->ses->capabilities &
+ do {
+ current_read_size = min_t(uint, read_size - total_read,
+ rsize);
+ /*
+ * For windows me and 9x we do not want to request more
+ * than it negotiated since it will refuse the read
+ * then.
+ */
+ if ((tcon->ses) && !(tcon->ses->capabilities &
tcon->ses->server->vals->cap_large_files)) {
- current_read_size = min_t(uint, current_read_size,
- CIFSMaxBufSize);
- }
- rc = -EAGAIN;
- while (rc == -EAGAIN) {
+ current_read_size = min_t(uint,
+ current_read_size, CIFSMaxBufSize);
+ }
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, true);
if (rc != 0)
@@ -3172,7 +3173,8 @@
rc = server->ops->sync_read(xid, open_file, &io_parms,
&bytes_read, &cur_offset,
&buf_type);
- }
+ } while (rc == -EAGAIN);
+
if (rc || (bytes_read == 0)) {
if (total_read) {
break;