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Keep read and write fds with each nlm_file

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We shouldn't really be using a read-only file descriptor to take a write
lock.

Most filesystems will put up with it.  But NFS, for example, won't.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
J. Bruce Fields 2021-08-23 16:44:00 -04:00 • committed by Chuck Lever
parent b661601a9f
commit 7f024fcd5c
7 changed files with 111 additions and 44 deletions
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9
include/linux/lockd/lockd.h
View file

@ -10,6 +10,8 @@
#ifndef LINUX_LOCKD_LOCKD_H
#define LINUX_LOCKD_LOCKD_H
/* XXX: a lot of this should really be under fs/lockd. */
#include <linux/in.h>
#include <linux/in6.h>
#include <net/ipv6.h>
@ -154,7 +156,8 @@ struct nlm_rqst {
struct nlm_file {
struct hlist_node f_list; /* linked list */
struct nfs_fh f_handle; /* NFS file handle */
struct file * f_file; /* VFS file pointer */
struct file * f_file[2]; /* VFS file pointers,
indexed by O_ flags */
struct nlm_share * f_shares; /* DOS shares */
struct list_head f_blocks; /* blocked locks */
unsigned int f_locks; /* guesstimate # of locks */
@ -267,6 +270,7 @@ typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
/*
* Server-side lock handling
*/
int lock_to_openmode(struct file_lock *);
__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
struct nlm_host *, struct nlm_lock *, int,
struct nlm_cookie *, int);
@ -301,7 +305,8 @@ int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
{
return locks_inode(file->f_file);
return locks_inode(file->f_file[O_RDONLY] ?
file->f_file[O_RDONLY] : file->f_file[O_WRONLY]);
}
static inline int __nlm_privileged_request4(const struct sockaddr *sap)