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authorJ. Bruce Fields <bfields@redhat.com>2012-03-05 13:18:59 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2013-11-09 00:16:41 -0500
commitdf4e8d2c1d2bbbbace706bfe5417320c9e3fbee3 (patch)
tree0a56a71e11f39a638be30064411dc6c3363114b6 /include/linux/fs.h
parent617588d5186c887eb94321b021bb5a46f896f4b3 (diff)
downloadlinux-linaro-stable-df4e8d2c1d2bbbbace706bfe5417320c9e3fbee3.tar.gz
locks: implement delegations
Implement NFSv4 delegations at the vfs level using the new FL_DELEG lock type. Note nfsd is the only delegation user and is only using read delegations. Warn on any attempt to set a write delegation for now. We'll come back to that case later. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r--include/linux/fs.h18
1 files changed, 15 insertions, 3 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 129e150f9e94..8e4be1be1a62 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1022,7 +1022,7 @@ extern int vfs_test_lock(struct file *, struct file_lock *);
extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
-extern int __break_lease(struct inode *inode, unsigned int flags);
+extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
extern void lease_get_mtime(struct inode *, struct timespec *time);
extern int generic_setlease(struct file *, long, struct file_lock **);
extern int vfs_setlease(struct file *, long, struct file_lock **);
@@ -1131,7 +1131,7 @@ static inline int flock_lock_file_wait(struct file *filp,
return -ENOLCK;
}
-static inline int __break_lease(struct inode *inode, unsigned int mode)
+static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
{
return 0;
}
@@ -1961,9 +1961,17 @@ static inline int locks_verify_truncate(struct inode *inode,
static inline int break_lease(struct inode *inode, unsigned int mode)
{
if (inode->i_flock)
- return __break_lease(inode, mode);
+ return __break_lease(inode, mode, FL_LEASE);
return 0;
}
+
+static inline int break_deleg(struct inode *inode, unsigned int mode)
+{
+ if (inode->i_flock)
+ return __break_lease(inode, mode, FL_DELEG);
+ return 0;
+}
+
#else /* !CONFIG_FILE_LOCKING */
static inline int locks_mandatory_locked(struct inode *inode)
{
@@ -2003,6 +2011,10 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
return 0;
}
+static inline int break_deleg(struct inode *inode, unsigned int mode)
+{
+ return 0;
+}
#endif /* CONFIG_FILE_LOCKING */
/* fs/open.c */