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NFS/pnfs: Fix pnfs_generic_prepare_to_resend_writes() 

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>
This commit is contained in:
Trond Myklebust 2020-01-06 15:25:04 -05:00 committed by Anna Schumaker
parent 2197e9b06c
commit 221203ce64
5 changed files with 16 additions and 9 deletions
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4
fs/nfs/direct.c
View File

@ -245,10 +245,10 @@ 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

@ -2334,6 +2334,7 @@ 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;
@ -2346,7 +2347,9 @@ 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

@ -4313,11 +4313,14 @@ 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

@ -31,12 +31,11 @@ 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

@ -1840,6 +1840,7 @@ 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;
@ -1868,7 +1869,8 @@ 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);