[PATCH v2 08/17] locks: plumb a "priv" pointer into the setlease routines

Jeff Layton
2014-09-04T12:39:10Z

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>
---
fs/cifs/cifsfs.c | 7 ++++---
fs/libfs.c | 4 +++-
fs/locks.c | 32 ++++++++++++++++++++------------
fs/nfsd/nfs4state.c | 4 ++--
include/linux/fs.h | 12 ++++++------
5 files changed, 35 insertions(+), 24 deletions(-)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 889b98455750..9d7996e8e793 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 **priv)
{
/*
* 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, priv);
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, priv);
else
return -EAGAIN;
}
diff --git a/fs/libfs.c b/fs/libfs.c
index 29012a303ef8..171d2846f2a3 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1081,12 +1081,14 @@ EXPORT_SYMBOL(alloc_anon_inode);
* @filp: file pointer
* @arg: type of lease to obtain
* @flp: new lease supplied for insertion
+ * @priv: private data for lm_setup operation
*
* 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)
+simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
+ void **priv)
{
return -EINVAL;
}
diff --git a/fs/locks.c b/fs/locks.c
index 81a4628f5594..7162a5836dba 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 **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);
}

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 96528f73dda4..f1870eb67b02 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 **priv);
+extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
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 **priv)
{
return -EINVAL;
}

static inline int vfs_setlease(struct file *filp, long arg,
- struct file_lock **lease)
+ struct file_lock **lease, void **priv)
{
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);
@@ -2599,7 +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 int simple_nosetlease(struct file *, long, struct file_lock **, void **);
extern const struct dentry_operations simple_dentry_operations;

extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
--
1.9.3