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NFSv4: Add support for application leases underpinned by a delegation

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If the NFSv4 client already holds a delegation for a file, then we can
support application leases (i.e. fcntl(fd, F_SETLEASE,...)) because the
underlying delegation guarantees that the file is not being modified on
the server by another client in a way that might conflict with the lease
guarantees.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-05-07 10:06:13 -04:00
parent 6b4befc0a0
commit e93a5e9306
3 changed files with 46 additions and 2 deletions
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3
fs/nfs/nfs4_fs.h
View file

@ -323,7 +323,8 @@ extern int update_open_stateid(struct nfs4_state *state,
const nfs4_stateid *open_stateid,
const nfs4_stateid *deleg_stateid,
fmode_t fmode);
extern int nfs4_proc_setlease(struct file *file, long arg,
struct file_lock **lease, void **priv);
extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
struct nfs_fsinfo *fsinfo);
extern void nfs4_update_changeattr(struct inode *dir,

8
fs/nfs/nfs4file.c
View file

@ -435,6 +435,12 @@ void nfs42_ssc_unregister_ops(void)
}
#endif /* CONFIG_NFS_V4_2 */
static int nfs4_setlease(struct file *file, long arg, struct file_lock **lease,
void **priv)
{
return nfs4_proc_setlease(file, arg, lease, priv);
}
const struct file_operations nfs4_file_operations = {
.read_iter = nfs_file_read,
.write_iter = nfs_file_write,
@ -448,7 +454,7 @@ const struct file_operations nfs4_file_operations = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.check_flags = nfs_check_flags,
.setlease = simple_nosetlease,
.setlease = nfs4_setlease,
#ifdef CONFIG_NFS_V4_2
.copy_file_range = nfs4_copy_file_range,
.llseek = nfs4_file_llseek,

37
fs/nfs/nfs4proc.c
View file

@ -7438,6 +7438,43 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
return nfs4_retry_setlk(state, cmd, request);
}
static int nfs4_delete_lease(struct file *file, void **priv)
{
return generic_setlease(file, F_UNLCK, NULL, priv);
}
static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
void **priv)
{
struct inode *inode = file_inode(file);
fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
int ret;
/* No delegation, no lease */
if (!nfs4_have_delegation(inode, type))
return -ENOLCK;
ret = generic_setlease(file, arg, lease, priv);
if (ret || nfs4_have_delegation(inode, type))
return ret;
/* We raced with a delegation return */
nfs4_delete_lease(file, priv);
return -ENOLCK;
}
int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
void **priv)
{
switch (arg) {
case F_RDLCK:
case F_WRLCK:
return nfs4_add_lease(file, arg, lease, priv);
case F_UNLCK:
return nfs4_delete_lease(file, priv);
default:
return -EINVAL;
}
}
int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
{
struct nfs_server *server = NFS_SERVER(state->inode);