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nfsd: allow layout state to be admin-revoked. 

When there is layout state on a filesystem that is being "unlocked" that
is now revoked, which involves closing the nfsd_file and releasing the
vfs lease.

To avoid races, ->ls_file can now be accessed either:
 - under ->fi_lock for the state's sc_file or
 - under rcu_read_lock() if nfsd_file_get() is used.
To support this, ->fence_client and nfsd4_cb_layout_fail() now take a
second argument being the nfsd_file.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
NeilBrown 2024-01-30 12:08:33 +11:00 committed by Chuck Lever
parent 06efa66750
commit 1e33e1414b
4 changed files with 50 additions and 16 deletions
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4
fs/nfsd/blocklayout.c
View File

@ -328,10 +328,10 @@ nfsd4_scsi_proc_layoutcommit(struct inode *inode,
}
static void
nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls, struct nfsd_file *file)
{
struct nfs4_client *clp = ls->ls_stid.sc_client;
struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev;
struct block_device *bdev = file->nf_file->f_path.mnt->mnt_sb->s_bdev;
bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
nfsd4_scsi_pr_key(clp), 0, true);

43
fs/nfsd/nfs4layouts.c
View File

@ -152,6 +152,23 @@ void nfsd4_setup_layout_type(struct svc_export *exp)
#endif
}
void nfsd4_close_layout(struct nfs4_layout_stateid *ls)
{
struct nfsd_file *fl;
spin_lock(&ls->ls_stid.sc_file->fi_lock);
fl = ls->ls_file;
ls->ls_file = NULL;
spin_unlock(&ls->ls_stid.sc_file->fi_lock);
if (fl) {
if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
vfs_setlease(fl->nf_file, F_UNLCK, NULL,
(void **)&ls);
nfsd_file_put(fl);
}
}
static void
nfsd4_free_layout_stateid(struct nfs4_stid *stid)
{
@ -169,9 +186,7 @@ nfsd4_free_layout_stateid(struct nfs4_stid *stid)
list_del_init(&ls->ls_perfile);
spin_unlock(&fp->fi_lock);
if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls);
nfsd_file_put(ls->ls_file);
nfsd4_close_layout(ls);
if (ls->ls_recalled)
atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
@ -605,7 +620,7 @@ nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
}
static void
nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls, struct nfsd_file *file)
{
struct nfs4_client *clp = ls->ls_stid.sc_client;
char addr_str[INET6_ADDRSTRLEN];
@ -627,7 +642,7 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
argv[0] = (char *)nfsd_recall_failed;
argv[1] = addr_str;
argv[2] = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_id;
argv[2] = file->nf_file->f_path.mnt->mnt_sb->s_id;
argv[3] = NULL;
error = call_usermodehelper(nfsd_recall_failed, argv, envp,
@ -657,6 +672,7 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
struct nfsd_net *nn;
ktime_t now, cutoff;
const struct nfsd4_layout_ops *ops;
struct nfsd_file *fl;
trace_nfsd_cb_layout_done(&ls->ls_stid.sc_stateid, task);
switch (task->tk_status) {
@ -688,12 +704,17 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
* Unknown error or non-responding client, we'll need to fence.
*/
trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid);
ops = nfsd4_layout_ops[ls->ls_layout_type];
if (ops->fence_client)
ops->fence_client(ls);
else
nfsd4_cb_layout_fail(ls);
rcu_read_lock();
fl = nfsd_file_get(ls->ls_file);
rcu_read_unlock();
if (fl) {
ops = nfsd4_layout_ops[ls->ls_layout_type];
if (ops->fence_client)
ops->fence_client(ls, fl);
else
nfsd4_cb_layout_fail(ls, fl);
nfsd_file_put(fl);
}
return 1;
case -NFS4ERR_NOMATCHING_LAYOUT:
trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);

11
fs/nfsd/nfs4state.c
View File

@ -1721,7 +1721,7 @@ void nfsd4_revoke_states(struct net *net, struct super_block *sb)
unsigned int idhashval;
unsigned int sc_types;
sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG;
sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
spin_lock(&nn->client_lock);
for (idhashval = 0; idhashval < CLIENT_HASH_MASK; idhashval++) {
@ -1734,6 +1734,7 @@ void nfsd4_revoke_states(struct net *net, struct super_block *sb)
if (stid) {
struct nfs4_ol_stateid *stp;
struct nfs4_delegation *dp;
struct nfs4_layout_stateid *ls;
spin_unlock(&nn->client_lock);
switch (stid->sc_type) {
@ -1789,6 +1790,10 @@ void nfsd4_revoke_states(struct net *net, struct super_block *sb)
if (dp)
revoke_delegation(dp);
break;
case SC_TYPE_LAYOUT:
ls = layoutstateid(stid);
nfsd4_close_layout(ls);
break;
}
nfs4_put_stid(stid);
spin_lock(&nn->client_lock);
@ -2868,7 +2873,6 @@ static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
struct nfsd_file *file;
ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
file = ls->ls_file;
seq_puts(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
@ -2876,12 +2880,15 @@ static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
/* XXX: What else would be useful? */
spin_lock(&ls->ls_stid.sc_file->fi_lock);
file = ls->ls_file;
if (file) {
seq_puts(s, ", ");
nfs4_show_superblock(s, file);
seq_puts(s, ", ");
nfs4_show_fname(s, file);
}
spin_unlock(&ls->ls_stid.sc_file->fi_lock);
if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
seq_puts(s, ", admin-revoked");
seq_puts(s, " }\n");

8
fs/nfsd/pnfs.h
View File

@ -37,7 +37,8 @@ struct nfsd4_layout_ops {
__be32 (*proc_layoutcommit)(struct inode *inode,
struct nfsd4_layoutcommit *lcp);
void (*fence_client)(struct nfs4_layout_stateid *ls);
void (*fence_client)(struct nfs4_layout_stateid *ls,
struct nfsd_file *file);
};
extern const struct nfsd4_layout_ops *nfsd4_layout_ops[];
@ -72,11 +73,13 @@ void nfsd4_setup_layout_type(struct svc_export *exp);
void nfsd4_return_all_client_layouts(struct nfs4_client *);
void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
struct nfs4_file *fp);
void nfsd4_close_layout(struct nfs4_layout_stateid *ls);
int nfsd4_init_pnfs(void);
void nfsd4_exit_pnfs(void);
#else
struct nfs4_client;
struct nfs4_file;
struct nfs4_layout_stateid;
static inline void nfsd4_setup_layout_type(struct svc_export *exp)
{
@ -89,6 +92,9 @@ static inline void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
struct nfs4_file *fp)
{
}
static inline void nfsd4_close_layout(struct nfs4_layout_stateid *ls)
{
}
static inline void nfsd4_exit_pnfs(void)
{
}