提交 149a4fdd 编写于 作者: B Benjamin Coddington 提交者: Trond Myklebust

nfs: don't create zero-length requests

NFS doesn't expect requests with wb_bytes set to zero and may make
unexpected decisions about how to handle that request at the page IO layer.
Skip request creation if we won't have any wb_bytes in the request.
Signed-off-by: NBenjamin Coddington <bcodding@redhat.com>
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: NWeston Andros Adamson <dros@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
上级 ffb6ca33
......@@ -1291,6 +1291,9 @@ int nfs_updatepage(struct file *file, struct page *page,
dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n",
file, count, (long long)(page_file_offset(page) + offset));
if (!count)
goto out;
if (nfs_can_extend_write(file, page, inode)) {
count = max(count + offset, nfs_page_length(page));
offset = 0;
......@@ -1301,7 +1304,7 @@ int nfs_updatepage(struct file *file, struct page *page,
nfs_set_pageerror(page);
else
__set_page_dirty_nobuffers(page);
out:
dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
status, (long long)i_size_read(inode));
return status;
......
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