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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-08-17 20:57:07 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-08-17 21:05:03 +0300
commite9ae58aeee8842a50f7e199d602a5ccb2e41a95f (patch)
treec7a00fc13d2c4eac3a8eb03238301615a9f8e0b2 /fs/nfs/pagelist.c
parentefcbc04e16dfa95fef76309f89710dd1d99a5453 (diff)
downloadlinux-e9ae58aeee8842a50f7e199d602a5ccb2e41a95f.tar.xz
NFS: nfs_set_pgio_error sometimes misses errors
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. Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pagelist.c')
-rw-r--r--fs/nfs/pagelist.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 4984bbe55ff1..7c5718ba625e 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -77,8 +77,8 @@ 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;