CIFS: Fix wsize usage in writepages
If a server change maximum buffer size for write (wsize) requests
on reconnect we can fail on repeating with a big size buffer on
-EAGAIN error in writepages. Fix this by checking wsize all the
time before repeating request in writepages.
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 0064d38f..ff4a9c3 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2009,19 +2009,17 @@
(loff_t)PAGE_CACHE_SIZE);
wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + wdata->tailsz;
- do {
- if (wdata->cfile != NULL)
- cifsFileInfo_put(wdata->cfile);
- wdata->cfile = find_writable_file(CIFS_I(mapping->host), false);
- if (!wdata->cfile) {
- cifs_dbg(VFS, "No writable handles for inode\n");
- rc = -EBADF;
- break;
- }
+ if (wdata->cfile != NULL)
+ cifsFileInfo_put(wdata->cfile);
+ wdata->cfile = find_writable_file(CIFS_I(mapping->host), false);
+ if (!wdata->cfile) {
+ cifs_dbg(VFS, "No writable handles for inode\n");
+ rc = -EBADF;
+ } else {
wdata->pid = wdata->cfile->pid;
server = tlink_tcon(wdata->cfile->tlink)->ses->server;
rc = server->ops->async_writev(wdata, cifs_writedata_release);
- } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN);
+ }
for (i = 0; i < nr_pages; ++i)
unlock_page(wdata->pages[i]);
@@ -2058,7 +2056,7 @@
retry:
while (!done && index <= end) {
unsigned int i, nr_pages, found_pages;
- pgoff_t next = 0, tofind;
+ pgoff_t next = 0, tofind, saved_index = index;
tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
end - index) + 1;
@@ -2102,6 +2100,11 @@
}
kref_put(&wdata->refcount, cifs_writedata_release);
+ if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) {
+ index = saved_index;
+ continue;
+ }
+
wbc->nr_to_write -= nr_pages;
if (wbc->nr_to_write <= 0)
done = true;