[PATCH] kdev_t crapectomy

	* since the last caller of is_read_only() is gone, the function
itself is removed.
	* destroy_buffers() is not used anymore; gone.
	* fsync_dev() is gone; the only user is (broken) lvm.c and first
step in fixing lvm.c will consist of propagating struct block_device *
anyway; at that point we'll just use fsync_bdev() in there.
	* prototype of bio_ioctl() removed - function doesn't exist
anymore.

Documentation/filesystems/porting

@@ -228,3 +228,21 @@ anything from oops to silent memory corruption.
 	Use bdev_read_only(bdev) instead of is_read_only(kdev).  The latter
 is still alive, but only because of the mess in drivers/s390/block/dasd.c.
 As soon as it gets fixed is_read_only() will die.
+
+---
+[mandatory]
+
+	is_read_only() is gone; use bdev_read_only() instead.
+
+---
+[mandatory]
+
+	destroy_buffers() is gone; use invalidate_bdev().
+
+---
+[mandatory]
+
+	fsync_dev() is gone; use fsync_bdev().  NOTE: lvm breakage is
+deliberate; as soon as struct block_device * is propagated in a reasonable
+way by that code fixing will become trivial; until then nothing can be
+done.

drivers/block/ll_rw_blk.c

@@ -1212,21 +1212,19 @@ void blk_put_request(struct request *rq)
 
 static long ro_bits[MAX_BLKDEV][8];
 
-int is_read_only(kdev_t dev)
+int bdev_read_only(struct block_device *bdev)
 {
 	int minor,major;
 
-	major = major(dev);
-	minor = minor(dev);
-	if (major < 0 || major >= MAX_BLKDEV) return 0;
+	if (!bdev)
+		return 0;
+	major = MAJOR(bdev->bd_dev);
+	minor = MINOR(bdev->bd_dev);
+	if (major < 0 || major >= MAX_BLKDEV)
+		return 0;
 	return ro_bits[major][minor >> 5] & (1 << (minor & 31));
 }
 
-int bdev_read_only(struct block_device *bdev)
-{
-	return bdev && is_read_only(to_kdev_t(bdev->bd_dev));
-}
-
 void set_device_ro(kdev_t dev,int flag)
 {
 	int minor,major;

fs/buffer.c

@@ -243,22 +243,6 @@ int fsync_bdev(struct block_device *bdev)
 	return sync_blockdev(bdev);
 }
 
-/*
- * Write out and wait upon all dirty data associated with this
- * kdev_t.   Filesystem data as well as the underlying block
- * device.  Takes the superblock lock.
- */
-int fsync_dev(kdev_t dev)
-{
-	struct block_device *bdev = bdget(kdev_t_to_nr(dev));
-	if (bdev) {
-		int res = fsync_bdev(bdev);
-		bdput(bdev);
-		return res;
-	}
-	return 0;
-}
-
 /*
  * sync everything.
  */

include/linux/bio.h

@@ -203,8 +203,6 @@ extern struct bio *bio_copy(struct bio *, int, int);
 
 extern inline void bio_init(struct bio *);
 
-extern int bio_ioctl(kdev_t, unsigned int, unsigned long);
-
 #ifdef CONFIG_HIGHMEM
 /*
  * remember to add offset! and never ever reenable interrupts between a

include/linux/buffer_head.h

@@ -121,7 +121,6 @@ BUFFER_FNS(Boundary, boundary)
 #define page_has_buffers(page)	PagePrivate(page)
 
 #define invalidate_buffers(dev)	__invalidate_buffers((dev), 0)
-#define destroy_buffers(dev)	__invalidate_buffers((dev), 1)
 
 
 /*
@@ -156,7 +155,6 @@ int sync_blockdev(struct block_device *bdev);
 void __wait_on_buffer(struct buffer_head *);
 void sleep_on_buffer(struct buffer_head *bh);
 void wake_up_buffer(struct buffer_head *bh);
-int fsync_dev(kdev_t);
 int fsync_bdev(struct block_device *);
 int fsync_super(struct super_block *);
 int fsync_no_super(struct block_device *);

include/linux/fs.h

@@ -1220,7 +1220,6 @@ extern void ll_rw_block(int, int, struct buffer_head * bh[]);
 extern int submit_bh(int, struct buffer_head *);
 struct bio;
 extern int submit_bio(int, struct bio *);
-extern int is_read_only(kdev_t);
 extern int bdev_read_only(struct block_device *);
 extern int set_blocksize(struct block_device *, int);
 extern int sb_set_blocksize(struct super_block *, int);

kernel/ksyms.c

@@ -185,7 +185,6 @@ EXPORT_SYMBOL(invalidate_inodes);
 EXPORT_SYMBOL(invalidate_device);
 EXPORT_SYMBOL(invalidate_inode_pages);
 EXPORT_SYMBOL(truncate_inode_pages);
-EXPORT_SYMBOL(fsync_dev);
 EXPORT_SYMBOL(fsync_bdev);
 EXPORT_SYMBOL(permission);
 EXPORT_SYMBOL(vfs_permission);
@@ -329,7 +328,6 @@ EXPORT_SYMBOL(tty_std_termios);
 /* block device driver support */
 EXPORT_SYMBOL(blk_size);
 EXPORT_SYMBOL(blk_dev);
-EXPORT_SYMBOL(is_read_only);
 EXPORT_SYMBOL(bdev_read_only);
 EXPORT_SYMBOL(set_device_ro);
 EXPORT_SYMBOL(bmap);