From: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Currently leases are only kept locally, so there's no way for a distributed
filesystem to enforce them against multiple clients. We're particularly
interested in the case of nfsd exporting a cluster filesystem, in which
case nfsd needs cluster-coherent leases in order to implement delegations
correctly.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
---
fs/locks.c | 7 +++++--
include/linux/fs.h | 1 +
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index 6ad3c7b..8fa4420 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1442,7 +1442,10 @@ int setlease(struct file *filp, long arg, struct file_lock **lease)
int error;
lock_kernel();
- error = __setlease(filp, arg, lease);
+ if (filp->f_op && filp->f_op->setlease)
+ error = filp->f_op->setlease(filp, arg, lease);
+ else
+ error = __setlease(filp, arg, lease);
unlock_kernel();
return error;
@@ -1474,7 +1477,7 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
lock_kernel();
- error = __setlease(filp, arg, &flp);
+ error = setlease(filp, arg, &flp);
if (error || arg == F_UNLCK)
goto out_unlock;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6a41f4c..4fbbc7f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1113,6 +1113,7 @@ struct file_operations {
int (*flock) (struct file *, int, struct file_lock *);
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
+ int (*setlease)(struct file *, long, struct file_lock **);
};
struct inode_operations {
--
1.5.2.58.g98ee
-
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