| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 26/84] NFS: nfs_set_pgio_error sometimes misses errors | Date | Tue, 29 Sep 2015 17:18:18 +0200 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust <trond.myklebust@primarydata.com>
commit e9ae58aeee8842a50f7e199d602a5ccb2e41a95f upstream.
We should ensure that we always set the pgio_header's error field if a READ or WRITE RPC call returns an error. The current code depends on 'hdr->good_bytes' always being initialised to a large value, which is not always done correctly by callers. When this happens, applications may end up missing important errors.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/nfs/pagelist.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -60,8 +60,8 @@ EXPORT_SYMBOL_GPL(nfs_pgheader_init); void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos) { spin_lock(&hdr->lock); - if (pos < hdr->io_start + hdr->good_bytes) { - set_bit(NFS_IOHDR_ERROR, &hdr->flags); + if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags) + || pos < hdr->io_start + hdr->good_bytes) { clear_bit(NFS_IOHDR_EOF, &hdr->flags); hdr->good_bytes = pos - hdr->io_start; hdr->error = error;
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