[PATCH] propagate mode through open_bdev_excl/close_bdev_excl

replace open_bdev_excl/close_bdev_excl with variants taking fmode_t.
superblock gets the value used to mount it stored in sb->s_mode

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 11 insertions, 13 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 05131baf3cf8..4b595904cefd 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1309,32 +1309,29 @@ fail:
 EXPORT_SYMBOL(lookup_bdev);
 
 /**
- * open_bdev_excl  -  open a block device by name and set it up for use
+ * open_bdev_exclusive  -  open a block device by name and set it up for use
  *
  * @path:       special file representing the block device
- * @flags:      %MS_RDONLY for opening read-only
+ * @mode:       FMODE_... combination to pass be used
  * @holder:     owner for exclusion
  *
  * Open the blockdevice described by the special file at @path, claim it
  * for the @holder.
  */
-struct block_device *open_bdev_excl(const char *path, int flags, void *holder)
+struct block_device *open_bdev_exclusive(const char *path, fmode_t mode, void *holder)
 {
         struct block_device *bdev;
-        fmode_t mode = FMODE_READ;
         int error = 0;
 
         bdev = lookup_bdev(path);
         if (IS_ERR(bdev))
                 return bdev;
 
-        if (!(flags & MS_RDONLY))
-                mode |= FMODE_WRITE;
         error = blkdev_get(bdev, mode, 0);
         if (error)
                 return ERR_PTR(error);
         error = -EACCES;
-        if (!(flags & MS_RDONLY) && bdev_read_only(bdev))
+        if ((mode & FMODE_WRITE) && bdev_read_only(bdev))
                 goto blkdev_put;
         error = bd_claim(bdev, holder);
         if (error)
@@ -1347,22 +1344,23 @@ blkdev_put:
         return ERR_PTR(error);
 }
 
-EXPORT_SYMBOL(open_bdev_excl);
+EXPORT_SYMBOL(open_bdev_exclusive);
 
 /**
- * close_bdev_excl  -  release a blockdevice openen by open_bdev_excl()
+ * close_bdev_exclusive  -  close a blockdevice opened by open_bdev_exclusive()
  *
  * @bdev:       blockdevice to close
+ * @mode:       mode, must match that used to open.
  *
- * This is the counterpart to open_bdev_excl().
+ * This is the counterpart to open_bdev_exclusive().
  */
-void close_bdev_excl(struct block_device *bdev)
+void close_bdev_exclusive(struct block_device *bdev, fmode_t mode)
 {
         bd_release(bdev);
-        blkdev_put(bdev, 0);    /* move up in the next patches */
+        blkdev_put(bdev, mode);
 }
 
-EXPORT_SYMBOL(close_bdev_excl);
+EXPORT_SYMBOL(close_bdev_exclusive);
 
 int __invalidate_device(struct block_device *bdev)
 {