3.16.39-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Benjamin Coddington <[email protected]> commit 149a4fddd0a72d526abbeac0c8deaab03559836a upstream. 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: Benjamin Coddington <[email protected]> Signed-off-by: Alexey Dobriyan <[email protected]> Reviewed-by: Weston Andros Adamson <[email protected]> Signed-off-by: Trond Myklebust <[email protected]> Signed-off-by: Ben Hutchings <[email protected]> --- fs/nfs/write.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1222,6 +1222,9 @@ int nfs_updatepage(struct file *file, st 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; @@ -1232,7 +1235,7 @@ int nfs_updatepage(struct file *file, st 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;
