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authorTrond Myklebust <trondmy@gmail.com>2020-01-06 13:40:36 -0500
committerJ. Bruce Fields <bfields@redhat.com>2020-01-22 16:25:41 -0500
commit524ff1af226ce0f6348d48b413849b2bd16c5b60 (patch)
tree65cb33075b71b208f4acfd4dbe2d6fe3b5c29e41 /fs/nfsd
parent809fe3c533789ebb51c1873b80c7dafbad9dbf19 (diff)
downloadlinux-524ff1af226ce0f6348d48b413849b2bd16c5b60.tar.bz2
nfsd: Ensure sampling of the commit verifier is atomic with the commit
When we have a successful commit, ensure we sample the commit verifier before releasing the lock. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs3proc.c3
-rw-r--r--fs/nfsd/nfs3xdr.c8
-rw-r--r--fs/nfsd/nfs4proc.c4
-rw-r--r--fs/nfsd/vfs.c8
-rw-r--r--fs/nfsd/vfs.h2
-rw-r--r--fs/nfsd/xdr3.h1
6 files changed, 14 insertions, 12 deletions
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index cea68d8411ac..ffdc592868a6 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -683,7 +683,8 @@ nfsd3_proc_commit(struct svc_rqst *rqstp)
RETURN_STATUS(nfserr_inval);
fh_copy(&resp->fh, &argp->fh);
- nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
+ nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count,
+ resp->verf);
RETURN_STATUS(nfserr);
}
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index c997b710af27..1ae4fc2eec00 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -1121,16 +1121,12 @@ int
nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd3_commitres *resp = rqstp->rq_resp;
- struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
- __be32 verf[2];
p = encode_wcc_data(rqstp, p, &resp->fh);
/* Write verifier */
if (resp->status == 0) {
- /* unique identifier, y2038 overflow can be ignored */
- nfsd_copy_boot_verifier(verf, nn);
- *p++ = verf[0];
- *p++ = verf[1];
+ *p++ = resp->verf[0];
+ *p++ = resp->verf[1];
}
return xdr_ressize_check(rqstp, p);
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 634f32d847e0..c3455e1b0d50 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -590,9 +590,9 @@ nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
{
struct nfsd4_commit *commit = &u->commit;
- gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
- commit->co_count);
+ commit->co_count,
+ (__be32 *)commit->co_verf.data);
}
static __be32
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 126149b06463..dc07d9797f11 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1105,7 +1105,7 @@ out:
*/
__be32
nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
- loff_t offset, unsigned long count)
+ loff_t offset, unsigned long count, __be32 *verf)
{
struct nfsd_file *nf;
loff_t end = LLONG_MAX;
@@ -1130,6 +1130,8 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
switch (err2) {
case 0:
+ nfsd_copy_boot_verifier(verf, net_generic(nf->nf_net,
+ nfsd_net_id));
break;
case -EINVAL:
err = nfserr_notsupp;
@@ -1140,7 +1142,9 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
nfsd_net_id));
}
up_write(&nf->nf_rwsem);
- }
+ } else
+ nfsd_copy_boot_verifier(verf, net_generic(nf->nf_net,
+ nfsd_net_id));
nfsd_file_put(nf);
out:
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index a91cd7982885..d23d9daacc3d 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -74,7 +74,7 @@ __be32 do_nfsd_create(struct svc_rqst *, struct svc_fh *,
struct svc_fh *res, int createmode,
u32 *verifier, bool *truncp, bool *created);
__be32 nfsd_commit(struct svc_rqst *, struct svc_fh *,
- loff_t, unsigned long);
+ loff_t, unsigned long, __be32 *verf);
#endif /* CONFIG_NFSD_V3 */
int nfsd_open_break_lease(struct inode *, int);
__be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
diff --git a/fs/nfsd/xdr3.h b/fs/nfsd/xdr3.h
index 0fa12988fb6a..fe6fd4556c2e 100644
--- a/fs/nfsd/xdr3.h
+++ b/fs/nfsd/xdr3.h
@@ -223,6 +223,7 @@ struct nfsd3_pathconfres {
struct nfsd3_commitres {
__be32 status;
struct svc_fh fh;
+ __be32 verf[2];
};
struct nfsd3_getaclres {