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NFS: nfs_set_pgio_error sometimes misses errors

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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>
This commit is contained in:
Trond Myklebust 2015-08-17 12:57:07 -05:00
parent efcbc04e16
commit e9ae58aeee
1 changed files with 2 additions and 2 deletions
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4
fs/nfs/pagelist.c
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@ -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) void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos)
{ {
spin_lock(&hdr->lock); spin_lock(&hdr->lock);
if (pos < hdr->io_start + hdr->good_bytes) { if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags)
set_bit(NFS_IOHDR_ERROR, &hdr->flags); || pos < hdr->io_start + hdr->good_bytes) {
clear_bit(NFS_IOHDR_EOF, &hdr->flags); clear_bit(NFS_IOHDR_EOF, &hdr->flags);
hdr->good_bytes = pos - hdr->io_start; hdr->good_bytes = pos - hdr->io_start;
hdr->error = error; hdr->error = error;