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.
Signed-off-by: Dai Ngo <[email protected]>
---
fs/nfsd/nfs4state.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 101 insertions(+), 8 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 917eaab45999..0e98e9c16e3e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -694,6 +694,57 @@ 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)
{
@@ -4969,7 +5020,7 @@ 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;
@@ -4985,6 +5036,13 @@ 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;
}
@@ -4992,6 +5050,13 @@ 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;
}
@@ -5038,21 +5103,29 @@ 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);
@@ -5393,7 +5466,7 @@ 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);
@@ -5627,6 +5700,26 @@ 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
*/
@@ -5634,8 +5727,8 @@ 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;
}
--
2.9.5
On Sun, May 01, 2022 at 10:38:11AM -0700, Dai Ngo wrote:
> 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.
>
Looks good to me.
Reviewed-by: J. Bruce Fields <[email protected]>
--b.
> Signed-off-by: Dai Ngo <[email protected]>
> ---
> fs/nfsd/nfs4state.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 101 insertions(+), 8 deletions(-)
>
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 917eaab45999..0e98e9c16e3e 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -694,6 +694,57 @@ 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)
> {
> @@ -4969,7 +5020,7 @@ 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;
> @@ -4985,6 +5036,13 @@ 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;
> }
> @@ -4992,6 +5050,13 @@ 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;
> }
> @@ -5038,21 +5103,29 @@ 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);
>
> @@ -5393,7 +5466,7 @@ 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);
> @@ -5627,6 +5700,26 @@ 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
> */
> @@ -5634,8 +5727,8 @@ 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;
> }
> --
> 2.9.5