diff options
| author |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2019-08-12 18:04:36 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2019-08-19 08:56:04 -0400 |
| commit | eb2c50da9e256dbbb3ff27694440e4c1900cfef8 (patch) | |
| tree | fb5c36bec2b2b8fdceeac4bc0e1fb74455b7e971 /fs/nfs/direct.c | |
| parent | NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend() (diff) | |
| download | linux-dev-eb2c50da9e256dbbb3ff27694440e4c1900cfef8.tar.xz linux-dev-eb2c50da9e256dbbb3ff27694440e4c1900cfef8.zip | |
NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0
If the attempt to resend the I/O results in no bytes being read/written,
we must ensure that we report the error.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Fixes: 0a00b77b331a ("nfs: mirroring support for direct io")
Cc: stable@vger.kernel.org # v3.20+
Diffstat (limited to 'fs/nfs/direct.c')
| -rw-r--r-- | fs/nfs/direct.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 0cb442406168..222d7115db71 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -401,15 +401,21 @@ static void nfs_direct_read_completion(struct nfs_pgio_header *hdr) unsigned long bytes = 0; struct nfs_direct_req *dreq = hdr->dreq; - if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) - goto out_put; - spin_lock(&dreq->lock); - if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && (hdr->good_bytes == 0)) + if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) dreq->error = hdr->error; - else + + if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) { + spin_unlock(&dreq->lock); + goto out_put; + } + + if (hdr->good_bytes != 0) nfs_direct_good_bytes(dreq, hdr); + if (test_bit(NFS_IOHDR_EOF, &hdr->flags)) + dreq->error = 0; + spin_unlock(&dreq->lock); while (!list_empty(&hdr->pages)) { @@ -782,16 +788,19 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr) bool request_commit = false; struct nfs_page *req = nfs_list_entry(hdr->pages.next); - if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) - goto out_put; - nfs_init_cinfo_from_dreq(&cinfo, dreq); spin_lock(&dreq->lock); if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) dreq->error = hdr->error; - if (dreq->error == 0) { + + if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) { + spin_unlock(&dreq->lock); + goto out_put; + } + + if (hdr->good_bytes != 0) { nfs_direct_good_bytes(dreq, hdr); if (nfs_write_need_commit(hdr)) { if (dreq->flags == NFS_ODIRECT_RESCHED_WRITES) |