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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-08-17 12:57:07 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-08-17 13:05:03 -0500 |
| commit | e9ae58aeee8842a50f7e199d602a5ccb2e41a95f (patch) | |
| tree | c7a00fc13d2c4eac3a8eb03238301615a9f8e0b2 /fs/nfs/pagelist.c | |
| parent | efcbc04e16dfa95fef76309f89710dd1d99a5453 (diff) | |
| download | lwn-e9ae58aeee8842a50f7e199d602a5ccb2e41a95f.tar.gz lwn-e9ae58aeee8842a50f7e199d602a5ccb2e41a95f.zip | |
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.c | 4 |
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; |