On Sat, Aug 23, 2014 at 10:41:14AM -0400, Jeff Layton wrote:
> 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
> auxillary info, and that the caller isn't required to set this unless
> the lm_setup specifically requires it.
>
> Signed-off-by: Jeff Layton <[email protected]>
> ---
> fs/cifs/cifsfs.c | 7 ++++---
> fs/gfs2/file.c | 3 ++-
> fs/locks.c | 33 +++++++++++++++++++++------------
> fs/nfs/file.c | 2 +-
> fs/nfs/internal.h | 2 +-
> fs/nfsd/nfs4state.c | 4 ++--
> include/linux/fs.h | 10 +++++-----
> 7 files changed, 36 insertions(+), 25 deletions(-)
>
> diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
> index 889b98455750..f463d86f097a 100644
> --- a/fs/cifs/cifsfs.c
> +++ b/fs/cifs/cifsfs.c
> @@ -813,7 +813,8 @@ static loff_t cifs_llseek(struct file *file, loff_t
> offset, int whence)
> return generic_file_llseek(file, offset, whence);
> }
>
> -static int cifs_setlease(struct file *file, long arg, struct file_lock
> **lease)
> +static int
> +cifs_setlease(struct file *file, long arg, struct file_lock **lease, void
> **aux)
> {
> /*
> * Note that this is called by vfs setlease with i_lock held to
> @@ -829,7 +830,7 @@ static int cifs_setlease(struct file *file, long arg,
> struct file_lock **lease)
> if (arg == F_UNLCK ||
> ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
> ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
> - return generic_setlease(file, arg, lease);
> + return generic_setlease(file, arg, lease, aux);
> else if (tlink_tcon(cfile->tlink)->local_lease &&
> !CIFS_CACHE_READ(CIFS_I(inode)))
> /*
> @@ -840,7 +841,7 @@ static int cifs_setlease(struct file *file, long arg,
> struct file_lock **lease)
> * knows that the file won't be changed on the server by anyone
> * else.
> */
> - return generic_setlease(file, arg, lease);
> + return generic_setlease(file, arg, lease, aux);
> else
> return -EAGAIN;
> }
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index 26b3f952e6b1..253feff90b4e 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -927,7 +927,8 @@ out_uninit:
> * Returns: errno
> */
>
> -static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
> +static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl,
> + void **aux)
> {
> return -EINVAL;
> }
> diff --git a/fs/locks.c b/fs/locks.c
> index 597e71a1e90f..906e09da115a 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -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
> **aux)
> {
> struct file_lock *fl, **before, **my_before = NULL, *lease;
> struct dentry *dentry = filp->f_path.dentry;
> @@ -1607,6 +1607,7 @@ static int generic_add_lease(struct file *filp, long
> arg, struct file_lock **flp
> }
>
> if (my_before != NULL) {
> + lease = *my_before;
What's this doing in this patch?
--b.
> error = lease->fl_lmops->lm_change(my_before, arg);
> if (!error)
> *flp = *my_before;
> @@ -1630,11 +1631,14 @@ 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)
> @@ -1658,13 +1662,15 @@ 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
> + * @aux: auxillary 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 **aux)
> {
> struct dentry *dentry = filp->f_path.dentry;
> struct inode *inode = dentry->d_inode;
> @@ -1689,19 +1695,20 @@ 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, aux);
> 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
> **aux)
> {
> if (filp->f_op->setlease)
> - return filp->f_op->setlease(filp, arg, lease);
> + return filp->f_op->setlease(filp, arg, lease, aux);
> else
> - return generic_setlease(filp, arg, lease);
> + return generic_setlease(filp, arg, lease, aux);
> }
>
> /**
> @@ -1709,6 +1716,7 @@ 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
> + * @aux: auxillary 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
> @@ -1724,13 +1732,14 @@ static int __vfs_setlease(struct file *filp, long
> arg, struct file_lock **lease)
> * this for leases held by processes on this node.
> */
>
> -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
> **aux)
> {
> 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, aux);
> spin_unlock(&inode->i_lock);
>
> return error;
> @@ -1755,7 +1764,7 @@ 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)
> @@ -1793,7 +1802,7 @@ 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);
> }
>
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index 524dd80d1898..7221022232d9 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -895,7 +895,7 @@ 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)
> +int nfs_setlease(struct file *file, long arg, struct file_lock **fl, void
> **aux)
> {
> dprintk("NFS: setlease(%pD2, arg=%ld)\n", file, arg);
> return -EINVAL;
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index 9056622d2230..dcdc83072c10 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -346,7 +346,7 @@ 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 **);
> +int nfs_setlease(struct file *, long, struct file_lock **, void **);
>
> /* inode.c */
> extern struct workqueue_struct *nfsiod_workqueue;
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index d0a6e8e022a2..d964a41c9151 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -683,7 +683,7 @@ static void nfs4_put_deleg_lease(struct nfs4_file *fp)
> if (!fp->fi_deleg_file)
> return;
> if (atomic_dec_and_test(&fp->fi_delegees)) {
> - vfs_setlease(fp->fi_deleg_file, F_UNLCK, NULL);
> + vfs_setlease(fp->fi_deleg_file, F_UNLCK, NULL, NULL);
> fput(fp->fi_deleg_file);
> fp->fi_deleg_file = NULL;
> }
> @@ -3788,7 +3788,7 @@ static int nfs4_setlease(struct nfs4_delegation *dp)
> }
> fl->fl_file = filp;
> ret = fl;
> - status = vfs_setlease(filp, fl->fl_type, &ret);
> + status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
> if (status) {
> locks_free_lock(fl);
> goto out_fput;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 458f733c96bd..2668d054147f 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -982,8 +982,8 @@ extern int vfs_cancel_lock(struct file *filp, struct
> file_lock *fl);
> extern int flock_lock_file_wait(struct file *filp, 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 **);
> -extern int vfs_setlease(struct file *, long, struct file_lock **);
> +extern int generic_setlease(struct file *, long, struct file_lock **, void
> **aux);
> +extern int vfs_setlease(struct file *, long, struct file_lock **, void
> **aux);
> extern int lease_modify(struct file_lock **, int);
> #else /* !CONFIG_FILE_LOCKING */
> static inline int fcntl_getlk(struct file *file, unsigned int cmd,
> @@ -1100,13 +1100,13 @@ static inline void lease_get_mtime(struct inode
> *inode, struct timespec *time)
> }
>
> static inline int generic_setlease(struct file *filp, long arg,
> - struct file_lock **flp)
> + struct file_lock **flp, void **aux)
> {
> return -EINVAL;
> }
>
> static inline int vfs_setlease(struct file *filp, long arg,
> - struct file_lock **lease)
> + struct file_lock **lease, void **aux)
> {
> return -EINVAL;
> }
> @@ -1494,7 +1494,7 @@ 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 **);
> + int (*setlease)(struct file *, long, struct file_lock **, void **);
> long (*fallocate)(struct file *file, int mode, loff_t offset,
> loff_t len);
> int (*show_fdinfo)(struct seq_file *m, struct file *f);
> --
> 1.9.3
>
> --
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