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NFS/pnfs: Fix pnfs_generic_prepare_to_resend_writes()

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commit 221203ce6406273cf00e5c6397257d986c003ee6 upstream.

Instead of making assumptions about the commit verifier contents, change
the commit code to ensure we always check that the verifier was set
by the XDR code.

Fixes: f54bcf2ece ("pnfs: Prepare for flexfiles by pulling out common code")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2020-01-06 15:25:04 -05:00 committed by Greg Kroah-Hartman
parent 3060883146
commit 056d165670
5 changed files with 16 additions and 9 deletions
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4
fs/nfs/direct.c
View file

@ -261,10 +261,10 @@ static int nfs_direct_cmp_commit_data_verf(struct nfs_direct_req *dreq,
data->ds_commit_index);
/* verifier not set so always fail */
if (verfp->committed < 0)
if (verfp->committed < 0 || data->res.verf->committed <= NFS_UNSTABLE)
return 1;
return nfs_direct_cmp_verf(verfp, &data->verf);
return nfs_direct_cmp_verf(verfp, data->res.verf);
}
/**

5
fs/nfs/nfs3xdr.c
View file

@ -2380,6 +2380,7 @@ static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
void *data)
{
struct nfs_commitres *result = data;
struct nfs_writeverf *verf = result->verf;
enum nfs_stat status;
int error;
@ -2392,7 +2393,9 @@ static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
result->op_status = status;
if (status != NFS3_OK)
goto out_status;
error = decode_writeverf3(xdr, &result->verf->verifier);
error = decode_writeverf3(xdr, &verf->verifier);
if (!error)
verf->committed = NFS_FILE_SYNC;
out:
return error;
out_status:

5
fs/nfs/nfs4xdr.c
View file

@ -4439,11 +4439,14 @@ static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifi
static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
{
struct nfs_writeverf *verf = res->verf;
int status;
status = decode_op_hdr(xdr, OP_COMMIT);
if (!status)
status = decode_write_verifier(xdr, &res->verf->verifier);
status = decode_write_verifier(xdr, &verf->verifier);
if (!status)
verf->committed = NFS_FILE_SYNC;
return status;
}

7
fs/nfs/pnfs_nfs.c
View file

@ -30,12 +30,11 @@ EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
/* Fake up some data that will cause nfs_commit_release to retry the writes. */
void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
{
struct nfs_page *first = nfs_list_entry(data->pages.next);
struct nfs_writeverf *verf = data->res.verf;
data->task.tk_status = 0;
memcpy(&data->verf.verifier, &first->wb_verf,
sizeof(data->verf.verifier));
data->verf.verifier.data[0]++; /* ensure verifier mismatch */
memset(&verf->verifier, 0, sizeof(verf->verifier));
verf->committed = NFS_UNSTABLE;
}
EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);

4
fs/nfs/write.c
View file

@ -1814,6 +1814,7 @@ static void nfs_commit_done(struct rpc_task *task, void *calldata)
static void nfs_commit_release_pages(struct nfs_commit_data *data)
{
const struct nfs_writeverf *verf = data->res.verf;
struct nfs_page *req;
int status = data->task.tk_status;
struct nfs_commit_info cinfo;
@ -1840,7 +1841,8 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
/* Okay, COMMIT succeeded, apparently. Check the verifier
* returned by the server against all stored verfs. */
if (!nfs_write_verifier_cmp(&req->wb_verf, &data->verf.verifier)) {
if (verf->committed > NFS_UNSTABLE &&
!nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier)) {
/* We have a match */
if (req->wb_page)
nfs_inode_remove_request(req);