NFS/pnfs: Fix pnfs_generic_prepare_to_resend_writes()

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: f54bcf2ecee9 ("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>

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 9cdac9945483b5c4c19c8c28669629e3a4da2570..9d07b53e1647b537d0d7e977b7339a0594c19c88 100644 (file)
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -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);
 }
 
 /**

diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 6cd33bd5da87c355c47ade6823e2c2683941e1b2..f1cb0b7eb05f90e9abc779094504bdd728327ebd 100644 (file)
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -2373,6 +2373,7 @@ 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;
 
@@ -2385,7 +2386,9 @@ 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:

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 525684b0056fc097e0aaff966004d7a3b7f8fd1d..0b2d051990e99593316b43a2d2d26bc7ded41f4b 100644 (file)
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4409,11 +4409,14 @@ 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;
 }
 

diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index 4a3dd66175fed1732dc4a8c6f8c241e6391d6f53..b0ef37f3e2dd7f126394b2660322b08574ab9bd1 100644 (file)
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -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);
 

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index ed3f5afc4ff7f2e12f3621bf3b4cdb962f958c27..89f36040adf6222cbb26bf481b6235b82bde73f6 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1807,6 +1807,7 @@ 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;
@@ -1833,7 +1834,8 @@ 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);