Commit 0efaa7e8 authored by Jeff Layton's avatar Jeff Layton
Browse files

locks: generic_delete_lease doesn't need a file_lock at all 



Ensure that it's OK to pass in a NULL file_lock double pointer on
a F_UNLCK request and convert the vfs_setlease F_UNLCK callers to
do just that.

Finally, turn the BUG_ON in generic_setlease into a WARN_ON_ONCE
with an error return. That's a problem we can handle without
crashing the box if it occurs.

Signed-off-by: default avatarJeff Layton <jlayton@primarydata.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 415b96c5

fs/locks.c

+14 −20
Original line number Original line Diff line number Diff line
@@ -1637,22 +1637,23 @@ out: 
	return error;

	return error;

}

}





static int generic_delete_lease(struct file *filp, struct file_lock **flp)

static int generic_delete_lease(struct file *filp)

{

{

	int error = -EAGAIN;

	struct file_lock *fl, **before;

	struct file_lock *fl, **before;

	struct dentry *dentry = filp->f_path.dentry;

	struct dentry *dentry = filp->f_path.dentry;

	struct inode *inode = dentry->d_inode;

	struct inode *inode = dentry->d_inode;





	trace_generic_delete_lease(inode, *flp);



	for (before = &inode->i_flock;

	for (before = &inode->i_flock;

			((fl = *before) != NULL) && IS_LEASE(fl);

			((fl = *before) != NULL) && IS_LEASE(fl);

			before = &fl->fl_next) {

			before = &fl->fl_next) {

		if (fl->fl_file != filp)

		if (fl->fl_file == filp)

			continue;

			break;

		return (*flp)->fl_lmops->lm_change(before, F_UNLCK);

	}

	}

	return -EAGAIN;

	trace_generic_delete_lease(inode, fl);

	if (fl)

		error = fl->fl_lmops->lm_change(before, F_UNLCK);

	return error;

}

}





/**

/**
@@ -1682,13 +1683,15 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) 




	time_out_leases(inode);

	time_out_leases(inode);





	BUG_ON(!(*flp)->fl_lmops->lm_break);



	switch (arg) {

	switch (arg) {

	case F_UNLCK:

	case F_UNLCK:

		return generic_delete_lease(filp, flp);

		return generic_delete_lease(filp);

	case F_RDLCK:

	case F_RDLCK:

	case F_WRLCK:

	case F_WRLCK:

		if (!(*flp)->fl_lmops->lm_break) {

			WARN_ON_ONCE(1);

			return -ENOLCK;

		}

		return generic_add_lease(filp, arg, flp);

		return generic_add_lease(filp, arg, flp);

	default:

	default:

		return -EINVAL;

		return -EINVAL;
@@ -1744,15 +1747,6 @@ int vfs_setlease(struct file *filp, long arg, struct file_lock **lease) 
}

}

EXPORT_SYMBOL_GPL(vfs_setlease);

EXPORT_SYMBOL_GPL(vfs_setlease);





static int do_fcntl_delete_lease(struct file *filp)

{

	struct file_lock fl, *flp = &fl;



	lease_init(filp, F_UNLCK, flp);



	return vfs_setlease(filp, F_UNLCK, &flp);

}



static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)

static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)

{

{

	struct file_lock *fl, *ret;

	struct file_lock *fl, *ret;
@@ -1809,7 +1803,7 @@ out_unlock: 
int fcntl_setlease(unsigned int fd, struct file *filp, long arg)

int fcntl_setlease(unsigned int fd, struct file *filp, long arg)

{

{

	if (arg == F_UNLCK)

	if (arg == F_UNLCK)

		return do_fcntl_delete_lease(filp);

		return vfs_setlease(filp, F_UNLCK, NULL);

	return do_fcntl_add_lease(fd, filp, arg);

	return do_fcntl_add_lease(fd, filp, arg);

}

}

fs/nfsd/nfs4state.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -690,7 +690,7 @@ static void nfs4_put_deleg_lease(struct nfs4_file *fp) 
	spin_unlock(&fp->fi_lock);

	spin_unlock(&fp->fi_lock);





	if (filp) {

	if (filp) {

		vfs_setlease(filp, F_UNLCK, &fl);

		vfs_setlease(filp, F_UNLCK, NULL);

		fput(filp);

		fput(filp);

	}

	}

}

}

include/trace/events/filelock.h

+7 −7
Original line number Original line Diff line number Diff line
@@ -53,15 +53,15 @@ DECLARE_EVENT_CLASS(filelock_lease, 
	),

	),





	TP_fast_assign(

	TP_fast_assign(

		__entry->fl = fl;

		__entry->fl = fl ? fl : NULL;

		__entry->s_dev = inode->i_sb->s_dev;

		__entry->s_dev = inode->i_sb->s_dev;

		__entry->i_ino = inode->i_ino;

		__entry->i_ino = inode->i_ino;

		__entry->fl_next = fl->fl_next;

		__entry->fl_next = fl ? fl->fl_next : NULL;

		__entry->fl_owner = fl->fl_owner;

		__entry->fl_owner = fl ? fl->fl_owner : NULL;

		__entry->fl_flags = fl->fl_flags;

		__entry->fl_flags = fl ? fl->fl_flags : 0;

		__entry->fl_type = fl->fl_type;

		__entry->fl_type = fl ? fl->fl_type : 0;

		__entry->fl_break_time = fl->fl_break_time;

		__entry->fl_break_time = fl ? fl->fl_break_time : 0;

		__entry->fl_downgrade_time = fl->fl_downgrade_time;

		__entry->fl_downgrade_time = fl ? fl->fl_downgrade_time : 0;

	),

	),





	TP_printk("fl=0x%p dev=0x%x:0x%x ino=0x%lx fl_next=0x%p fl_owner=0x%p fl_flags=%s fl_type=%s fl_break_time=%lu fl_downgrade_time=%lu",

	TP_printk("fl=0x%p dev=0x%x:0x%x ino=0x%lx fl_next=0x%p fl_owner=0x%p fl_flags=%s fl_type=%s fl_break_time=%lu fl_downgrade_time=%lu",

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