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locks: consolidate "nolease" routines

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GFS2 and NFS have setlease routines that always just return -EINVAL.
Turn that into a generic routine that can live in fs/libfs.c.

Cc: <linux-nfs@vger.kernel.org>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: <cluster-devel@redhat.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jeff Layton 2014-08-27 06:49:41 -04:00
parent 699688a416
commit 1c994a0909
6 changed files with 20 additions and 35 deletions
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22
fs/gfs2/file.c
View file

@ -912,26 +912,6 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
/**
* gfs2_setlease - acquire/release a file lease
* @file: the file pointer
* @arg: lease type
* @fl: file lock
*
* We don't currently have a way to enforce a lease across the whole
* cluster; until we do, disable leases (by just returning -EINVAL),
* unless the administrator has requested purely local locking.
*
* Locking: called under i_lock
*
* Returns: errno
*/
static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
{
return -EINVAL;
}
/**
* gfs2_lock - acquire/release a posix lock on a file
* @file: the file pointer
@ -1069,7 +1049,7 @@ const struct file_operations gfs2_file_fops = {
.flock = gfs2_flock,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.setlease = gfs2_setlease,
.setlease = simple_nosetlease,
.fallocate = gfs2_fallocate,
};

16
fs/libfs.c
View file

@ -1075,3 +1075,19 @@ struct inode *alloc_anon_inode(struct super_block *s)
return inode;
}
EXPORT_SYMBOL(alloc_anon_inode);
/**
* simple_nosetlease - generic helper for prohibiting leases
* @filp: file pointer
* @arg: type of lease to obtain
* @flp: new lease supplied for insertion
*
* Generic helper for filesystems that do not wish to allow leases to be set.
* All arguments are ignored and it just returns -EINVAL.
*/
int
simple_nosetlease(struct file *filp, long arg, struct file_lock **flp)
{
return -EINVAL;
}
EXPORT_SYMBOL(simple_nosetlease);

13
fs/nfs/file.c
View file

@ -891,17 +891,6 @@ int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
}
EXPORT_SYMBOL_GPL(nfs_flock);
/*
* There is no protocol support for leases, so we have no way to implement
* them correctly in the face of opens by other clients.
*/
int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
{
dprintk("NFS: setlease(%pD2, arg=%ld)\n", file, arg);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(nfs_setlease);
const struct file_operations nfs_file_operations = {
.llseek = nfs_file_llseek,
.read = new_sync_read,
@ -918,6 +907,6 @@ const struct file_operations nfs_file_operations = {
.splice_read = nfs_file_splice_read,
.splice_write = iter_file_splice_write,
.check_flags = nfs_check_flags,
.setlease = nfs_setlease,
.setlease = simple_nosetlease,
};
EXPORT_SYMBOL_GPL(nfs_file_operations);

1
fs/nfs/internal.h
View file

@ -346,7 +346,6 @@ int nfs_file_release(struct inode *, struct file *);
int nfs_lock(struct file *, int, struct file_lock *);
int nfs_flock(struct file *, int, struct file_lock *);
int nfs_check_flags(int);
int nfs_setlease(struct file *, long, struct file_lock **);
/* inode.c */
extern struct workqueue_struct *nfsiod_workqueue;

2
fs/nfs/nfs4file.c
View file

@ -131,5 +131,5 @@ const struct file_operations nfs4_file_operations = {
.splice_read = nfs_file_splice_read,
.splice_write = iter_file_splice_write,
.check_flags = nfs_check_flags,
.setlease = nfs_setlease,
.setlease = simple_nosetlease,
};

1
include/linux/fs.h
View file

@ -2599,6 +2599,7 @@ extern int simple_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata);
extern int always_delete_dentry(const struct dentry *);
extern struct inode *alloc_anon_inode(struct super_block *);
extern int simple_nosetlease(struct file *, long, struct file_lock **);
extern const struct dentry_operations simple_dentry_operations;
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);