linux-kernel - Re: [PATCH 1/3] locks: introduce locks_lock_inode

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Date:	Thu, 22 Oct 2015 12:21:44 -0400 (EDT)
From:	Benjamin Coddington <bcodding@...hat.com>
To:	Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Alexander Viro <viro@...iv.linux.org.uk>
cc:	Christoph Hellwig <hch@...radead.org>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Eric Van Hensbergen <ericvh@...il.com>,
	Ron Minnich <rminnich@...dia.gov>,
	Latchesar Ionkov <lucho@...kov.net>,
	Yan Zheng <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
	Ilya Dryomov <idryomov@...il.com>,
	Steve French <sfrench@...ba.org>,
	Christine Caulfield <ccaulfie@...hat.com>,
	David Teigland <teigland@...hat.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Bob Peterson <rpeterso@...hat.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>,
	aybuke ozdemir <aybuke.147@...il.com>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Abdul Hussain <habdul@...teon.com>,
	lustre-devel@...ts.lustre.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
	ceph-devel@...r.kernel.org, linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org, cluster-devel@...hat.com,
	fuse-devel@...ts.sourceforge.net, linux-nfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: [PATCH 1/3] locks: introduce locks_lock_inode_wait()

On Thu, 22 Oct 2015, Benjamin Coddington wrote:

> Users of the locks API commonly call either posix_lock_file_wait() or
> flock_lock_file_wait() depending upon the lock type.  Add a new function
> locks_lock_inode_wait() which will check and call the correct function for
> the type of lock passed in.
>
> Signed-off-by: Benjamin Coddington <bcodding@...hat.com>
> ---
>  fs/locks.c         |   24 ++++++++++++++++++++++++
>  include/linux/fs.h |   11 +++++++++++
>  2 files changed, 35 insertions(+), 0 deletions(-)
>
> diff --git a/fs/locks.c b/fs/locks.c
> index 2a54c80..68b1784 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -1876,6 +1876,30 @@ int flock_lock_inode_wait(struct inode *inode, struct file_lock *fl)
>  EXPORT_SYMBOL(flock_lock_inode_wait);
>
>  /**
> + * locks_lock_inode_wait - Apply a lock to an inode
> + * @inode: inode of the file to apply to
> + * @fl: The lock to be applied
> + *
> + * Apply a POSIX or FLOCK style lock request to an inode.
> + */
> +int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl)
> +{
> +	int res = 0;
> +	switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
> +		case FL_POSIX:
> +			res = posix_lock_inode_wait(inode, fl);
> +			break;
> +		case FL_FLOCK:
> +			res = flock_lock_inode_wait(inode, fl);
> +			break;
> +		default:
> +			BUG();
> +	}
> +	return res;
> +}
> +EXPORT_SYMBOL(locks_lock_inode_wait);
> +
> +/**
>   *	sys_flock: - flock() system call.
>   *	@fd: the file descriptor to lock.
>   *	@cmd: the type of lock to apply.
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 72d8a84..2e283b7 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1059,6 +1059,7 @@ 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_inode_wait(struct inode *inode, struct file_lock *fl);
> +extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
>  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 **, void **priv);
> @@ -1177,6 +1178,11 @@ static inline int flock_lock_inode_wait(struct inode *inode,
>  	return -ENOLCK;
>  }
>
> +static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
> +{
> +	return -ENOLCK;
> +}
> +

So, this is obviously wrong - thank you 0-day robot.  Yes, I did build and
test against these patches, but went back and added this after I realized it
should work w/o CONFIG_FILE_LOCKING.  I'll re-send.

Ben

>  static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
>  {
>  	return 0;
> @@ -1225,6 +1231,11 @@ static inline int flock_lock_file_wait(struct file *filp, struct file_lock *fl)
>  	return flock_lock_inode_wait(file_inode(filp), fl);
>  }
>
> +static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
> +{
> +	return locks_lock_inode_wait(file_inode(filp), fl);
> +}
> +
>  struct fasync_struct {
>  	spinlock_t		fa_lock;
>  	int			magic;
> --
> 1.7.1
>
> --
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