NFSv4: Fix the nfsv4 readlink reply buffer alignment

[sfrench/cifs-2.6.git] / fs / locks.c

diff --git a/fs/locks.c b/fs/locks.c
index 838ca542c55659619a894cae34cd860ed21fc0b6..4f2d749ac624f6315f947c4e44513d170ac23e14 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -659,7 +659,7 @@ static int locks_block_on_timeout(struct file_lock *blocker, struct file_lock *w
        return result;
 }
 
-int
+void
 posix_test_lock(struct file *filp, struct file_lock *fl)
 {
        struct file_lock *cfl;
@@ -671,14 +671,12 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
                if (posix_locks_conflict(cfl, fl))
                        break;
        }
-       if (cfl) {
+       if (cfl)
                __locks_copy_lock(fl, cfl);
-               unlock_kernel();
-               return 1;
-       } else
+       else
                fl->fl_type = F_UNLCK;
        unlock_kernel();
-       return 0;
+       return;
 }
 
 EXPORT_SYMBOL(posix_test_lock);
@@ -1326,7 +1324,7 @@ int fcntl_getlease(struct file *filp)
 }
 
 /**
- *     __setlease      -       sets a lease on an open file
+ *     setlease        -       sets a lease on an open file
  *     @filp: file pointer
  *     @arg: type of lease to obtain
  *     @flp: input - file_lock to use, output - file_lock inserted
@@ -1336,13 +1334,21 @@ int fcntl_getlease(struct file *filp)
  *
  *     Called with kernel lock held.
  */
-static int __setlease(struct file *filp, long arg, struct file_lock **flp)
+int setlease(struct file *filp, long arg, struct file_lock **flp)
 {
        struct file_lock *fl, **before, **my_before = NULL, *lease;
        struct dentry *dentry = filp->f_path.dentry;
        struct inode *inode = dentry->d_inode;
        int error, rdlease_count = 0, wrlease_count = 0;
 
+       if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
+               return -EACCES;
+       if (!S_ISREG(inode->i_mode))
+               return -EINVAL;
+       error = security_file_lock(filp, arg);
+       if (error)
+               return error;
+
        time_out_leases(inode);
 
        BUG_ON(!(*flp)->fl_lmops->fl_break);
@@ -1413,39 +1419,49 @@ static int __setlease(struct file *filp, long arg, struct file_lock **flp)
 out:
        return error;
 }
+EXPORT_SYMBOL(setlease);
 
  /**
- *     setlease        -       sets a lease on an open file
+ *     vfs_setlease        -       sets a lease on an open file
  *     @filp: file pointer
  *     @arg: type of lease to obtain
  *     @lease: file_lock to use
  *
  *     Call this to establish a lease on the file.
- *     The fl_lmops fl_break function is required by break_lease
+ *     The (*lease)->fl_lmops->fl_break operation must be set; if not,
+ *     break_lease will oops!
+ *
+ *     This will call the filesystem's setlease file method, if
+ *     defined.  Note that there is no getlease method; instead, the
+ *     filesystem setlease method should call back to setlease() to
+ *     add a lease to the inode's lease list, where fcntl_getlease() can
+ *     find it.  Since fcntl_getlease() only reports whether the current
+ *     task holds a lease, a cluster filesystem need only do this for
+ *     leases held by processes on this node.
+ *
+ *     There is also no break_lease method; filesystems that
+ *     handle their own leases shoud break leases themselves from the
+ *     filesystem's open, create, and (on truncate) setattr methods.
+ *
+ *     Warning: the only current setlease methods exist only to disable
+ *     leases in certain cases.  More vfs changes may be required to
+ *     allow a full filesystem lease implementation.
  */
 
-int setlease(struct file *filp, long arg, struct file_lock **lease)
+int vfs_setlease(struct file *filp, long arg, struct file_lock **lease)
 {
-       struct dentry *dentry = filp->f_path.dentry;
-       struct inode *inode = dentry->d_inode;
        int error;
 
-       if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
-               return -EACCES;
-       if (!S_ISREG(inode->i_mode))
-               return -EINVAL;
-       error = security_file_lock(filp, arg);
-       if (error)
-               return error;
-
        lock_kernel();
-       error = __setlease(filp, arg, lease);
+       if (filp->f_op && filp->f_op->setlease)
+               error = filp->f_op->setlease(filp, arg, lease);
+       else
+               error = setlease(filp, arg, lease);
        unlock_kernel();
 
        return error;
 }
-
-EXPORT_SYMBOL(setlease);
+EXPORT_SYMBOL_GPL(vfs_setlease);
 
 /**
  *     fcntl_setlease  -       sets a lease on an open file
@@ -1464,14 +1480,6 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
        struct inode *inode = dentry->d_inode;
        int error;
 
-       if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
-               return -EACCES;
-       if (!S_ISREG(inode->i_mode))
-               return -EINVAL;
-       error = security_file_lock(filp, arg);
-       if (error)
-               return error;
-
        locks_init_lock(&fl);
        error = lease_init(filp, arg, &fl);
        if (error)
@@ -1479,15 +1487,15 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
 
        lock_kernel();
 
-       error = __setlease(filp, arg, &flp);
+       error = vfs_setlease(filp, arg, &flp);
        if (error || arg == F_UNLCK)
                goto out_unlock;
 
        error = fasync_helper(fd, filp, 1, &flp->fl_fasync);
        if (error < 0) {
-               /* remove lease just inserted by __setlease */
+               /* remove lease just inserted by setlease */
                flp->fl_type = F_UNLCK | F_INPROGRESS;
-               flp->fl_break_time = jiffies- 10;
+               flp->fl_break_time = jiffies - 10;
                time_out_leases(inode);
                goto out_unlock;
        }
@@ -1592,8 +1600,7 @@ asmlinkage long sys_flock(unsigned int fd, unsigned int cmd)
 /**
  * vfs_test_lock - test file byte range lock
  * @filp: The file to test lock for
- * @fl: The lock to test
- * @conf: Place to return a copy of the conflicting lock, if found
+ * @fl: The lock to test; also used to hold result
  *
  * Returns -ERRNO on failure.  Indicates presence of conflicting lock by
  * setting conf->fl_type to something other than F_UNLCK.