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authorJeff Layton <jlayton@kernel.org>2021-08-19 14:56:38 -0400
committerJeff Layton <jlayton@kernel.org>2021-08-23 06:15:36 -0400
commitf7e33bdbd6d1bdf9c3df8bba5abcf3399f957ac3 (patch)
tree00770e117522b347bb99858aa9069171f0c8b779 /fs/nfsd
parent2f488f698fda820f8e6fa0407630154eceb145d6 (diff)
fs: remove mandatory file locking support
We added CONFIG_MANDATORY_FILE_LOCKING in 2015, and soon after turned it off in Fedora and RHEL8. Several other distros have followed suit. I've heard of one problem in all that time: Someone migrated from an older distro that supported "-o mand" to one that didn't, and the host had a fstab entry with "mand" in it which broke on reboot. They didn't actually _use_ mandatory locking so they just removed the mount option and moved on. This patch rips out mandatory locking support wholesale from the kernel, along with the Kconfig option and the Documentation file. It also changes the mount code to ignore the "mand" mount option instead of erroring out, and to throw a big, ugly warning. Signed-off-by: Jeff Layton <jlayton@kernel.org>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c14
-rw-r--r--fs/nfsd/vfs.c23
2 files changed, 1 insertions, 36 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index fa67ecd5fe63..8313e1dbb5dc 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5735,16 +5735,6 @@ check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid,
NFS4_SHARE_DENY_READ);
}
-/*
- * Allow READ/WRITE during grace period on recovered state only for files
- * that are not able to provide mandatory locking.
- */
-static inline int
-grace_disallows_io(struct net *net, struct inode *inode)
-{
- return opens_in_grace(net) && mandatory_lock(inode);
-}
-
static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
{
/*
@@ -6026,7 +6016,6 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
stateid_t *stateid, int flags, struct nfsd_file **nfp,
struct nfs4_stid **cstid)
{
- struct inode *ino = d_inode(fhp->fh_dentry);
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct nfs4_stid *s = NULL;
@@ -6035,9 +6024,6 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
if (nfp)
*nfp = NULL;
- if (grace_disallows_io(net, ino))
- return nfserr_grace;
-
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
status = check_special_stateids(net, fhp, stateid, flags);
goto done;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index a224a5e23cc1..92e77f92268a 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -333,7 +333,6 @@ nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct iattr *iap)
{
struct inode *inode = d_inode(fhp->fh_dentry);
- int host_err;
if (iap->ia_size < inode->i_size) {
__be32 err;
@@ -343,20 +342,7 @@ nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (err)
return err;
}
-
- host_err = get_write_access(inode);
- if (host_err)
- goto out_nfserrno;
-
- host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
- if (host_err)
- goto out_put_write_access;
- return 0;
-
-out_put_write_access:
- put_write_access(inode);
-out_nfserrno:
- return nfserrno(host_err);
+ return nfserrno(get_write_access(inode));
}
/*
@@ -750,13 +736,6 @@ __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
err = nfserr_perm;
if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE))
goto out;
- /*
- * We must ignore files (but only files) which might have mandatory
- * locks on them because there is no way to know if the accesser has
- * the lock.
- */
- if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
- goto out;
if (!inode->i_fop)
goto out;