This is a note to let you know that I've just added the patch titled
NFSD: add support for share reservation conflict to courteous server
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-add-support-for-share-reservation-conflict-to-c.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 47815f9eb7a628e864170cedd2b5fe5e1c3ced7b
Author: Dai Ngo <dai.ngo@xxxxxxxxxx>
Date: Mon May 2 14:19:22 2022 -0700
NFSD: add support for share reservation conflict to courteous server
[ Upstream commit 3d69427151806656abf129342028f3f4e5e1fee0 ]
This patch allows expired client with open state to be in COURTESY
state. Share/access conflict with COURTESY client is resolved by
setting COURTESY client to EXPIRABLE state, schedule laundromat
to run and returning nfserr_jukebox to the request client.
Reviewed-by: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Signed-off-by: Dai Ngo <dai.ngo@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1e15bb2d8382b..3dfdd9e1c5028 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -705,6 +705,57 @@ static unsigned int file_hashval(struct svc_fh *fh)
static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
+/*
+ * Check if courtesy clients have conflicting access and resolve it if possible
+ *
+ * access: is op_share_access if share_access is true.
+ * Check if access mode, op_share_access, would conflict with
+ * the current deny mode of the file 'fp'.
+ * access: is op_share_deny if share_access is false.
+ * Check if the deny mode, op_share_deny, would conflict with
+ * current access of the file 'fp'.
+ * stp: skip checking this entry.
+ * new_stp: normal open, not open upgrade.
+ *
+ * Function returns:
+ * false - access/deny mode conflict with normal client.
+ * true - no conflict or conflict with courtesy client(s) is resolved.
+ */
+static bool
+nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
+ struct nfs4_ol_stateid *stp, u32 access, bool share_access)
+{
+ struct nfs4_ol_stateid *st;
+ bool resolvable = true;
+ unsigned char bmap;
+ struct nfsd_net *nn;
+ struct nfs4_client *clp;
+
+ lockdep_assert_held(&fp->fi_lock);
+ list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
+ /* ignore lock stateid */
+ if (st->st_openstp)
+ continue;
+ if (st == stp && new_stp)
+ continue;
+ /* check file access against deny mode or vice versa */
+ bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
+ if (!(access & bmap_to_share_mode(bmap)))
+ continue;
+ clp = st->st_stid.sc_client;
+ if (try_to_expire_client(clp))
+ continue;
+ resolvable = false;
+ break;
+ }
+ if (resolvable) {
+ clp = stp->st_stid.sc_client;
+ nn = net_generic(clp->net, nfsd_net_id);
+ mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
+ }
+ return resolvable;
+}
+
static void
__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
{
@@ -4985,7 +5036,7 @@ nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
- struct nfsd4_open *open)
+ struct nfsd4_open *open, bool new_stp)
{
struct nfsd_file *nf = NULL;
__be32 status;
@@ -5001,6 +5052,13 @@ static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
*/
status = nfs4_file_check_deny(fp, open->op_share_deny);
if (status != nfs_ok) {
+ if (status != nfserr_share_denied) {
+ spin_unlock(&fp->fi_lock);
+ goto out;
+ }
+ if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
+ stp, open->op_share_deny, false))
+ status = nfserr_jukebox;
spin_unlock(&fp->fi_lock);
goto out;
}
@@ -5008,6 +5066,13 @@ static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
/* set access to the file */
status = nfs4_file_get_access(fp, open->op_share_access);
if (status != nfs_ok) {
+ if (status != nfserr_share_denied) {
+ spin_unlock(&fp->fi_lock);
+ goto out;
+ }
+ if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
+ stp, open->op_share_access, true))
+ status = nfserr_jukebox;
spin_unlock(&fp->fi_lock);
goto out;
}
@@ -5054,21 +5119,29 @@ static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
}
static __be32
-nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
+nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
+ struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
+ struct nfsd4_open *open)
{
__be32 status;
unsigned char old_deny_bmap = stp->st_deny_bmap;
if (!test_access(open->op_share_access, stp))
- return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
+ return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
/* test and set deny mode */
spin_lock(&fp->fi_lock);
status = nfs4_file_check_deny(fp, open->op_share_deny);
if (status == nfs_ok) {
- set_deny(open->op_share_deny, stp);
- fp->fi_share_deny |=
+ if (status != nfserr_share_denied) {
+ set_deny(open->op_share_deny, stp);
+ fp->fi_share_deny |=
(open->op_share_deny & NFS4_SHARE_DENY_BOTH);
+ } else {
+ if (nfs4_resolve_deny_conflicts_locked(fp, false,
+ stp, open->op_share_deny, false))
+ status = nfserr_jukebox;
+ }
}
spin_unlock(&fp->fi_lock);
@@ -5409,7 +5482,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
goto out;
}
} else {
- status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
+ status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
if (status) {
stp->st_stid.sc_type = NFS4_CLOSED_STID;
release_open_stateid(stp);
@@ -5643,6 +5716,26 @@ static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
}
#endif
+static bool
+nfs4_has_any_locks(struct nfs4_client *clp)
+{
+ int i;
+ struct nfs4_stateowner *so;
+
+ spin_lock(&clp->cl_lock);
+ for (i = 0; i < OWNER_HASH_SIZE; i++) {
+ list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
+ so_strhash) {
+ if (so->so_is_open_owner)
+ continue;
+ spin_unlock(&clp->cl_lock);
+ return true;
+ }
+ }
+ spin_unlock(&clp->cl_lock);
+ return false;
+}
+
/*
* place holder for now, no check for lock blockers yet
*/
@@ -5650,8 +5743,8 @@ static bool
nfs4_anylock_blockers(struct nfs4_client *clp)
{
if (atomic_read(&clp->cl_delegs_in_recall) ||
- client_has_openowners(clp) ||
- !list_empty(&clp->async_copies))
+ !list_empty(&clp->async_copies) ||
+ nfs4_has_any_locks(clp))
return true;
return false;
}
