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locks: plumb a "priv" pointer into the setlease routines

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In later patches, we're going to add a new lock_manager_operation to
finish setting up the lease while still holding the i_lock.  To do
this, we'll need to pass a little bit of info in the fcntl setlease
case (primarily an fasync structure). Plumb the extra pointer into
there in advance of that.

We declare this pointer as a void ** to make it clear that this is
private info, and that the caller isn't required to set this unless
the lm_setup specifically requires it.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jeff Layton 2014-08-22 10:40:25 -04:00
parent 0c637be884
commit e6f5c78930
7 changed files with 37 additions and 26 deletions
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32
fs/locks.c
View file

@ -1297,7 +1297,6 @@ int lease_modify(struct file_lock **before, int arg)
}
return 0;
}
EXPORT_SYMBOL(lease_modify);
static bool past_time(unsigned long then)
@ -1543,7 +1542,8 @@ check_conflicting_open(const struct dentry *dentry, const long arg)
return ret;
}
static int generic_add_lease(struct file *filp, long arg, struct file_lock **flp)
static int
generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **priv)
{
struct file_lock *fl, **before, **my_before = NULL, *lease;
struct dentry *dentry = filp->f_path.dentry;
@ -1630,11 +1630,14 @@ static int generic_add_lease(struct file *filp, long arg, struct file_lock **flp
smp_mb();
error = check_conflicting_open(dentry, arg);
if (error)
locks_unlink_lock(before);
goto out_unlink;
out:
if (is_deleg)
mutex_unlock(&inode->i_mutex);
return error;
out_unlink:
locks_unlink_lock(before);
goto out;
}
static int generic_delete_lease(struct file *filp)
@ -1661,13 +1664,15 @@ static int generic_delete_lease(struct file *filp)
* @filp: file pointer
* @arg: type of lease to obtain
* @flp: input - file_lock to use, output - file_lock inserted
* @priv: private data for lm_setup
*
* The (input) flp->fl_lmops->lm_break function is required
* by break_lease().
*
* Called with inode->i_lock held.
*/
int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
int generic_setlease(struct file *filp, long arg, struct file_lock **flp,
void **priv)
{
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
@ -1692,19 +1697,20 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
WARN_ON_ONCE(1);
return -ENOLCK;
}
return generic_add_lease(filp, arg, flp);
return generic_add_lease(filp, arg, flp, priv);
default:
return -EINVAL;
}
}
EXPORT_SYMBOL(generic_setlease);
static int __vfs_setlease(struct file *filp, long arg, struct file_lock **lease)
static int
__vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
{
if (filp->f_op->setlease)
return filp->f_op->setlease(filp, arg, lease);
return filp->f_op->setlease(filp, arg, lease, priv);
else
return generic_setlease(filp, arg, lease);
return generic_setlease(filp, arg, lease, priv);
}
/**
@ -1712,6 +1718,7 @@ static int __vfs_setlease(struct file *filp, long arg, struct file_lock **lease)
* @filp: file pointer
* @arg: type of lease to obtain
* @lease: file_lock to use when adding a lease
* @priv: private info for lm_setup when adding a lease
*
* Call this to establish a lease on the file. The "lease" argument is not
* used for F_UNLCK requests and may be NULL. For commands that set or alter
@ -1720,13 +1727,14 @@ static int __vfs_setlease(struct file *filp, long arg, struct file_lock **lease)
* stack trace).
*/
int vfs_setlease(struct file *filp, long arg, struct file_lock **lease)
int
vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
{
struct inode *inode = file_inode(filp);
int error;
spin_lock(&inode->i_lock);
error = __vfs_setlease(filp, arg, lease);
error = __vfs_setlease(filp, arg, lease, priv);
spin_unlock(&inode->i_lock);
return error;
@ -1751,7 +1759,7 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
}
ret = fl;
spin_lock(&inode->i_lock);
error = __vfs_setlease(filp, arg, &ret);
error = __vfs_setlease(filp, arg, &ret, NULL);
if (error)
goto out_unlock;
if (ret == fl)
@ -1789,7 +1797,7 @@ out_unlock:
int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
{
if (arg == F_UNLCK)
return vfs_setlease(filp, F_UNLCK, NULL);
return vfs_setlease(filp, F_UNLCK, NULL, NULL);
return do_fcntl_add_lease(fd, filp, arg);
}