Merge master.kernel.org:/home/hch/BK/xfs/linux-2.5

into home.transmeta.com:/home/torvalds/v2.5/linux

fs/block_dev.c

@@ -22,6 +22,7 @@
 #include <linux/mpage.h>
 #include <linux/mount.h>
 #include <linux/uio.h>
+#include <linux/namei.h>
 #include <asm/uaccess.h>
 
 
@@ -796,3 +797,82 @@ const char *__bdevname(dev_t dev)
 	sprintf(buffer, "%s(%d,%d)", name, MAJOR(dev), MINOR(dev));
 	return buffer;
 }
+
+/**
+ * open_bdev_excl  -  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
+ * @kind:	usage (same as the 4th paramter to blkdev_get)
+ * @holder:	owner for exclusion
+ *
+ * Open the blockdevice described by the special file at @path, claim it
+ * for the @holder and properly set it up for @kind usage.
+ */
+struct block_device *open_bdev_excl(const char *path, int flags,
+				    int kind, void *holder)
+{
+	struct inode *inode;
+	struct block_device *bdev;
+	struct nameidata nd;
+	mode_t mode = FMODE_READ;
+	int error = 0;
+
+	if (!path || !*path)
+		return ERR_PTR(-EINVAL);
+
+	error = path_lookup(path, LOOKUP_FOLLOW, &nd);
+	if (error)
+		return ERR_PTR(error);
+
+	inode = nd.dentry->d_inode;
+	error = -ENOTBLK;
+	if (!S_ISBLK(inode->i_mode))
+		goto path_release;
+	error = -EACCES;
+	if (nd.mnt->mnt_flags & MNT_NODEV)
+		goto path_release;
+	error = bd_acquire(inode);
+	if (error)
+		goto path_release;
+	bdev = inode->i_bdev;
+
+	/* Done with lookups */
+	path_release(&nd);
+
+	if (!(flags & MS_RDONLY))
+		mode |= FMODE_WRITE;
+	error = blkdev_get(bdev, mode, 0, kind);
+	if (error)
+		return ERR_PTR(error);
+	error = -EACCES;
+	if (!(flags & MS_RDONLY) && bdev_read_only(bdev))
+		goto blkdev_put;
+	error = bd_claim(bdev, holder);
+	if (error)
+		goto blkdev_put;
+
+	return bdev;
+	
+blkdev_put:
+	blkdev_put(bdev, BDEV_FS);
+	return ERR_PTR(error);
+
+path_release:
+	path_release(&nd);
+	return ERR_PTR(error);
+}
+
+/**
+ * close_bdev_excl  -  release a blockdevice openen by open_bdev_excl()
+ *
+ * @bdev:	blockdevice to close
+ * @kind:	usage (same as the 4th paramter to blkdev_get)
+ *
+ * This is the counterpart to open_bdev_excl().
+ */
+void close_bdev_excl(struct block_device *bdev, int kind)
+{
+	bd_release(bdev);
+	blkdev_put(bdev, kind);
+}

fs/super.c

@@ -505,55 +505,25 @@ struct super_block *get_sb_bdev(struct file_system_type *fs_type,
 	int flags, char *dev_name, void * data,
 	int (*fill_super)(struct super_block *, void *, int))
 {
-	struct inode *inode;
 	struct block_device *bdev;
-	struct super_block * s;
-	struct nameidata nd;
+	struct super_block *s;
 	int error = 0;
-	mode_t mode = FMODE_READ; /* we always need it ;-) */
 
-	/* What device it is? */
-	if (!dev_name || !*dev_name)
-		return ERR_PTR(-EINVAL);
-	error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
-	if (error)
-		return ERR_PTR(error);
-	inode = nd.dentry->d_inode;
-	error = -ENOTBLK;
-	if (!S_ISBLK(inode->i_mode))
-		goto out;
-	error = -EACCES;
-	if (nd.mnt->mnt_flags & MNT_NODEV)
-		goto out;
-	error = bd_acquire(inode);
-	if (error)
-		goto out;
-	bdev = inode->i_bdev;
-	/* Done with lookups, semaphore down */
-	if (!(flags & MS_RDONLY))
-		mode |= FMODE_WRITE;
-	error = blkdev_get(bdev, mode, 0, BDEV_FS);
-	if (error)
-		goto out;
-	error = -EACCES;
-	if (!(flags & MS_RDONLY) && bdev_read_only(bdev))
-		goto out1;
-	error = bd_claim(bdev, fs_type);
-	if (error)
-		goto out1;
+	bdev = open_bdev_excl(dev_name, flags, BDEV_FS, fs_type);
+	if (IS_ERR(bdev))
+		return (struct super_block *)bdev;
 
 	s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
-	if (IS_ERR(s)) {
-		bd_release(bdev);
-		blkdev_put(bdev, BDEV_FS);
-	} else if (s->s_root) {
+	if (IS_ERR(s))
+		goto out;
+
+	if (s->s_root) {
 		if ((flags ^ s->s_flags) & MS_RDONLY) {
 			up_write(&s->s_umount);
 			deactivate_super(s);
 			s = ERR_PTR(-EBUSY);
 		}
-		bd_release(bdev);
-		blkdev_put(bdev, BDEV_FS);
+		goto out;
 	} else {
 		s->s_flags = flags;
 		strncpy(s->s_id, bdevname(bdev), sizeof(s->s_id));
@@ -567,14 +537,12 @@ struct super_block *get_sb_bdev(struct file_system_type *fs_type,
 		} else
 			s->s_flags |= MS_ACTIVE;
 	}
-	path_release(&nd);
+
 	return s;
 
-out1:
-	blkdev_put(bdev, BDEV_FS);
 out:
-	path_release(&nd);
-	return ERR_PTR(error);
+	close_bdev_excl(bdev, BDEV_FS);
+	return s;
 }
 
 void kill_block_super(struct super_block *sb)
@@ -582,8 +550,7 @@ void kill_block_super(struct super_block *sb)
 	struct block_device *bdev = sb->s_bdev;
 	generic_shutdown_super(sb);
 	set_blocksize(bdev, sb->s_old_blocksize);
-	bd_release(bdev);
-	blkdev_put(bdev, BDEV_FS);
+	close_bdev_excl(bdev, BDEV_FS);
 }
 
 struct super_block *get_sb_nodev(struct file_system_type *fs_type,

fs/xfs/linux/xfs_linux.h

@@ -42,7 +42,6 @@
 #include <linux/sched.h>
 #include <linux/bitops.h>
 #include <linux/major.h>
-#include <linux/root_dev.h>
 
 #include <asm/page.h>
 #include <asm/div64.h>

fs/xfs/linux/xfs_lrw.c

@@ -215,54 +215,46 @@ xfs_sendfile(
 	void			*target,
 	cred_t			*credp)
 {
-	size_t			size = 0;
 	ssize_t			ret;
 	xfs_fsize_t		n;
 	xfs_inode_t		*ip;
-	xfs_mount_t		*mp;
 	vnode_t			*vp;
+	int			invisible = (filp->f_mode & FINVIS);
 
 	ip = XFS_BHVTOI(bdp);
 	vp = BHV_TO_VNODE(bdp);
-	mp = ip->i_mount;
 	vn_trace_entry(vp, "xfs_sendfile", (inst_t *)__return_address);
 
 	XFS_STATS_INC(xfsstats.xs_read_calls);
 
 	n = XFS_MAX_FILE_OFFSET - *offp;
-	if ((n <= 0) || (size == 0))
+	if ((n <= 0) || (count == 0))
 		return 0;
 
-	if (n < size)
-		size = n;
+	if (n < count)
+		count = n;
 
-	if (XFS_FORCED_SHUTDOWN(mp)) {
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
 		return -EIO;
-	}
 
 	xfs_ilock(ip, XFS_IOLOCK_SHARED);
-
-	if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ) &&
-	    !(filp->f_mode & FINVIS)) {
-		int error;
+	if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ) && !invisible) {
 		vrwlock_t locktype = VRWLOCK_READ;
+		int error;
 
 		error = xfs_dm_send_data_event(DM_EVENT_READ, bdp, *offp,
-				size, FILP_DELAY_FLAG(filp), &locktype);
+				count, FILP_DELAY_FLAG(filp), &locktype);
 		if (error) {
 			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
 			return -error;
 		}
 	}
-
 	ret = generic_file_sendfile(filp, offp, count, actor, target);
 	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
 
 	XFS_STATS_ADD(xfsstats.xs_read_bytes, ret);
-
-	if (!(filp->f_mode & FINVIS))
+	if (!invisible)
 		xfs_ichgtime(ip, XFS_ICHGTIME_ACC);
-
 	return ret;
 }
 

fs/xfs/linux/xfs_lrw.h

@@ -58,6 +58,9 @@ extern ssize_t xfs_read (struct bhv_desc *, struct file *,
 extern ssize_t xfs_write (struct bhv_desc *, struct file *,
 				const struct iovec *, unsigned long,
 				loff_t *, struct cred *);
+extern ssize_t xfs_sendfile (struct bhv_desc *, struct file *,
+				loff_t *, size_t, read_actor_t,
+				void *, struct cred *);
 
 extern int xfs_dev_is_read_only (struct xfs_mount *, char *);
 

fs/xfs/linux/xfs_super.c

@@ -468,27 +468,18 @@ xfs_initialize_vnode(
 
 int
 xfs_blkdev_get(
+	xfs_mount_t		*mp,
 	const char		*name,
 	struct block_device	**bdevp)
 {
-	struct nameidata	nd;
-	int			error;
+	int			error = 0;
 
-	error = path_lookup(name, LOOKUP_FOLLOW, &nd);
-	if (error) {
+	*bdevp = open_bdev_excl(name, 0, BDEV_FS, mp);
+	if (IS_ERR(*bdevp)) {
+		error = PTR_ERR(*bdevp);
 		printk("XFS: Invalid device [%s], error=%d\n", name, error);
-		return -error;
-	}
-
-	/* I think we actually want bd_acquire here..  --hch */
-	*bdevp = bdget(kdev_t_to_nr(nd.dentry->d_inode->i_rdev));
-	if (*bdevp) {
-		error = blkdev_get(*bdevp, FMODE_READ|FMODE_WRITE, 0, BDEV_FS);
-	} else {
-		error = -ENOMEM;
 	}
 
-	path_release(&nd);
 	return -error;
 }
 
@@ -497,7 +488,7 @@ xfs_blkdev_put(
 	struct block_device	*bdev)
 {
 	if (bdev)
-		blkdev_put(bdev, BDEV_FS);
+		close_bdev_excl(bdev, BDEV_FS);
 }
 
 void
@@ -761,17 +752,6 @@ linvfs_clear_inode(
 	}
 }
 
-STATIC void
-linvfs_put_inode(
-	struct inode		*ip)
-{
-	vnode_t			*vp = LINVFS_GET_VP(ip);
-	int			error;
-
-	if (vp && vp->v_fbhv && (atomic_read(&ip->i_count) == 1))
-		VOP_RELEASE(vp, error);
-}
-
 STATIC void
 linvfs_put_super(
 	struct super_block	*sb)
@@ -989,7 +969,6 @@ STATIC struct super_operations linvfs_sops = {
 	.alloc_inode		= linvfs_alloc_inode,
 	.destroy_inode		= linvfs_destroy_inode,
 	.write_inode		= linvfs_write_inode,
-	.put_inode		= linvfs_put_inode,
 	.clear_inode		= linvfs_clear_inode,
 	.put_super		= linvfs_put_super,
 	.write_super		= linvfs_write_super,

fs/xfs/linux/xfs_super.h

@@ -78,12 +78,14 @@
 #define LINVFS_SET_VFS(s, vfsp) \
 	((s)->s_fs_info = vfsp)
 
+struct xfs_mount;
 struct pb_target;
 struct block_device;
 
 extern void xfs_initialize_vnode (bhv_desc_t *, vnode_t *, bhv_desc_t *, int);
 
-extern int  xfs_blkdev_get (const char *, struct block_device **);
+extern int  xfs_blkdev_get (struct xfs_mount *, const char *,
+				struct block_device **);
 extern void xfs_blkdev_put (struct block_device *);
 
 extern struct pb_target *xfs_alloc_buftarg (struct block_device *);

fs/xfs/pagebuf/page_buf.h

@@ -109,7 +109,6 @@ typedef enum page_buf_flags_e {		/* pb_flags values */
 
 	/* flags used only internally */
 	_PBF_LOCKABLE = (1 << 19), /* page_buf_t may be locked		   */
-	_PBF_PRIVATE_BH = (1 << 20), /* do not use public buffer heads	   */
 	_PBF_ALL_PAGES_MAPPED = (1 << 21),
 				/* all pages in rage are mapped		   */
 	_PBF_ADDR_ALLOCATED = (1 << 22),
@@ -195,6 +194,10 @@ typedef int (*page_buf_bdstrat_t)(struct page_buf_s *);
 #define PB_PAGES	4
 
 typedef struct page_buf_s {
+	struct semaphore	pb_sema;	/* semaphore for lockables  */
+	unsigned long		pb_flushtime;	/* time to flush pagebuf    */
+	atomic_t		pb_pin_count;	/* pin count		    */
+	wait_queue_head_t	pb_waiters;	/* unpin waiters	    */
 	struct list_head	pb_list;
 	page_buf_flags_t	pb_flags;	/* status flags */
 	struct list_head	pb_hash_list;
@@ -221,6 +224,9 @@ typedef struct page_buf_s {
 	unsigned char		pb_hash_index;	/* hash table index	*/
 	struct page		**pb_pages;	/* array of page pointers */
 	struct page		*pb_page_array[PB_PAGES]; /* inline pages */
+#ifdef PAGEBUF_LOCK_TRACKING
+	int			pb_last_holder;
+#endif
 } page_buf_t;
 
 
@@ -244,14 +250,6 @@ extern page_buf_t *pagebuf_get(		/* allocate a buffer		*/
 		page_buf_flags_t);	/* PBF_LOCK, PBF_READ,		*/
 					/* PBF_ASYNC			*/	
 
-extern page_buf_t *pagebuf_lookup(
-		struct pb_target *,
-		struct inode *,
-		loff_t,			/* starting offset of range	*/
-		size_t,			/* length of range		*/
-		page_buf_flags_t);	/* PBF_READ, PBF_WRITE,		*/
-					/* PBF_FORCEIO, _PBF_LOCKABLE	*/
-
 extern page_buf_t *pagebuf_get_empty(	/* allocate pagebuf struct with */
 					/*  no memory or disk address	*/
 		struct pb_target *);	/* mount point "fake" inode	*/
@@ -340,7 +338,7 @@ extern caddr_t	pagebuf_offset(page_buf_t *, off_t);
 
 extern void pagebuf_iomove(		/* move data in/out of pagebuf	*/
 		page_buf_t *,		/* buffer to manipulate		*/
-		off_t,			/* starting buffer offset	*/
+		size_t,			/* starting buffer offset	*/
 		size_t,			/* length in buffer		*/
 		caddr_t,		/* data pointer			*/
 		page_buf_rw_t);		/* direction			*/

fs/xfs/pagebuf/page_buf_internal.h

@@ -48,24 +48,10 @@
 #define page_has_buffers(page)	((page)->buffers)
 #endif
 
-typedef struct page_buf_private_s {
-	page_buf_t		pb_common;	/* public part of structure */
-	struct semaphore	pb_sema;	/* semaphore for lockables  */
-	unsigned long		pb_flushtime;	/* time to flush pagebuf    */
-	atomic_t		pb_pin_count;	/* pin count		    */
-	wait_queue_head_t	pb_waiters;	/* unpin waiters	    */
 #ifdef PAGEBUF_LOCK_TRACKING
-	int			pb_last_holder;
-#endif
-} page_buf_private_t;
-
-#define PBC(pb) (&((pb)->pb_common))
-#define PBP(pb) ((page_buf_private_t *) (pb))
-
-#ifdef PAGEBUF_LOCK_TRACKING
-#define PB_SET_OWNER(pb)	(PBP(pb)->pb_last_holder = current->pid)
-#define PB_CLEAR_OWNER(pb)	(PBP(pb)->pb_last_holder = -1)
-#define PB_GET_OWNER(pb)	(PBP(pb)->pb_last_holder)
+#define PB_SET_OWNER(pb)	(pb->pb_last_holder = current->pid)
+#define PB_CLEAR_OWNER(pb)	(pb->pb_last_holder = -1)
+#define PB_GET_OWNER(pb)	(pb->pb_last_holder)
 #else
 #define PB_SET_OWNER(pb)
 #define PB_CLEAR_OWNER(pb)
@@ -95,12 +81,6 @@ struct pagebuf_trace_buf {
 #define PB_TRACE_BUFSIZE	1024
 #define CIRC_INC(i)	(((i) + 1) & (PB_TRACE_BUFSIZE - 1))
 
-typedef struct pagebuf_daemon {
-	int			active;
-	spinlock_t		pb_delwrite_lock;
-	struct list_head	pb_delwrite_l;
-} pagebuf_daemon_t;
-
 /*
  * Tunable pagebuf parameters
  */

fs/xfs/pagebuf/page_buf_locking.c

@@ -75,7 +75,7 @@ pagebuf_cond_lock(			/* lock buffer, if not locked	*/
 
 	ASSERT(pb->pb_flags & _PBF_LOCKABLE);
 
-	locked = down_trylock(&PBP(pb)->pb_sema) == 0;
+	locked = down_trylock(&pb->pb_sema) == 0;
 	if (locked) {
 		PB_SET_OWNER(pb);
 	}
@@ -95,7 +95,7 @@ pagebuf_lock_value(
 	page_buf_t		*pb)
 {
 	ASSERT(pb->pb_flags & _PBF_LOCKABLE);
-	return(atomic_read(&PBP(pb)->pb_sema.count));
+	return(atomic_read(&pb->pb_sema.count));
 }
 
 /*
@@ -114,7 +114,7 @@ pagebuf_lock(
 
 	PB_TRACE(pb, PB_TRACE_REC(lock), 0);
 	pagebuf_run_queues(pb);
-	down(&PBP(pb)->pb_sema);
+	down(&pb->pb_sema);
 	PB_SET_OWNER(pb);
 	PB_TRACE(pb, PB_TRACE_REC(locked), 0);
 	return 0;
@@ -133,6 +133,6 @@ pagebuf_unlock(				/* unlock buffer		*/
 {
 	ASSERT(pb->pb_flags & _PBF_LOCKABLE);
 	PB_CLEAR_OWNER(pb);
-	up(&PBP(pb)->pb_sema);
+	up(&pb->pb_sema);
 	PB_TRACE(pb, PB_TRACE_REC(unlock), 0);
 }

fs/xfs/xfs_mount.h

@@ -428,11 +428,6 @@ int		xfs_syncsub(xfs_mount_t *, int, int, int *);
 void		xfs_initialize_perag(xfs_mount_t *, int);
 void		xfs_xlatesb(void *, struct xfs_sb *, int, xfs_arch_t, __int64_t);
 
-int		xfs_blkdev_get(const char *, struct block_device **);
-void		xfs_blkdev_put(struct block_device *);
-struct xfs_buftarg *xfs_alloc_buftarg(struct block_device *);
-void		xfs_free_buftarg(struct xfs_buftarg *);
-
 /*
  * Flags for freeze operations.
  */

fs/xfs/xfs_vfsops.c

@@ -381,8 +381,9 @@ xfs_finish_flags(
  *	(2) logical volume with data and log subvolumes.
  *	(3) logical volume with data, log, and realtime subvolumes.
  *
- * The Linux VFS took care of finding and opening the data volume for
- * us.  We have to handle the other two (if present) here.
+ * We only have to handle opening the log and realtime volumes here if
+ * they are present.  The data subvolume has already been opened by
+ * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
  */
 STATIC int
 xfs_mount(
@@ -398,19 +399,24 @@ xfs_mount(
 	ddev = vfsp->vfs_super->s_bdev;
 	logdev = rtdev = NULL;
 
+	/*
+	 * Allocate VFS private data (xfs mount structure).
+	 */
+	mp = xfs_mount_init();
+
 	/*
 	 * Open real time and log devices - order is important.
 	 */
 	if (args->logname[0]) {
-		error = xfs_blkdev_get(args->logname, &logdev);
+		error = xfs_blkdev_get(mp, args->logname, &logdev);
 		if (error)
-			return error;
+			goto free_mp;
 	}
 	if (args->rtname[0]) {
-		error = xfs_blkdev_get(args->rtname, &rtdev);
+		error = xfs_blkdev_get(mp, args->rtname, &rtdev);
 		if (error) {
 			xfs_blkdev_put(logdev);
-			return error;
+			goto free_mp;
 		}
 
 		if (rtdev == ddev || rtdev == logdev) {
@@ -418,15 +424,11 @@ xfs_mount(
 	"XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
 			xfs_blkdev_put(logdev);
 			xfs_blkdev_put(rtdev);
-			return EINVAL;
+			error = EINVAL;
+			goto free_mp;
 		}
 	}
 
-	/*
-	 * Allocate VFS private data (xfs mount structure).
-	 */
-	mp = xfs_mount_init();
-
 	vfs_insertbhv(vfsp, &mp->m_bhv, &xfs_vfsops, mp);
 
 	mp->m_ddev_targp = xfs_alloc_buftarg(ddev);
@@ -459,7 +461,7 @@ xfs_mount(
 		xfs_size_buftarg(mp->m_logdev_targp, mp->m_sb.sb_blocksize, ss);
 	}
 	if (rtdev)
-		xfs_size_buftarg(mp->m_logdev_targp, mp->m_sb.sb_blocksize,
+		xfs_size_buftarg(mp->m_rtdev_targp, mp->m_sb.sb_blocksize,
 				 mp->m_sb.sb_blocksize);
 
 	error = xfs_mountfs(vfsp, mp, ddev->bd_dev, flags);
@@ -476,6 +478,8 @@ xfs_mount(
 		xfs_binval(mp->m_rtdev_targp);
 	}
 	xfs_unmountfs_close(mp, NULL);
+
+ free_mp:
 	xfs_mount_free(mp, 1);
 	return error;
 }

fs/xfs/xfs_vnodeops.c

@@ -4870,6 +4870,7 @@ vnodeops_t xfs_vnodeops = {
 	BHV_IDENTITY_INIT(VN_BHV_XFS,VNODE_POSITION_XFS),
 	.vop_open		= xfs_open,
 	.vop_read		= xfs_read,
+	.vop_sendfile		= xfs_sendfile,
 	.vop_write		= xfs_write,
 	.vop_ioctl		= xfs_ioctl,
 	.vop_getattr		= xfs_getattr,

fs/xfs/xfsidbg.c

@@ -1793,7 +1793,7 @@ kdbm_pb_flags(int argc, const char **argv, const char **envp, struct pt_regs *re
 static int
 kdbm_pb(int argc, const char **argv, const char **envp, struct pt_regs *regs)
 {
-	page_buf_private_t bp;
+	page_buf_t bp;
 	unsigned long addr;
 	long	offset=0;
 	int nextarg;
@@ -1808,43 +1808,43 @@ kdbm_pb(int argc, const char **argv, const char **envp, struct pt_regs *regs)
 		return diag;
 
 	kdb_printf("page_buf_t at 0x%lx\n", addr);
-	kdb_printf("  pb_flags %s\n", pb_flags(bp.pb_common.pb_flags));
+	kdb_printf("  pb_flags %s\n", pb_flags(bp.pb_flags));
 	kdb_printf("  pb_target 0x%p pb_hold %d pb_next 0x%p pb_prev 0x%p\n",
-		   bp.pb_common.pb_target, bp.pb_common.pb_hold.counter,
-		   bp.pb_common.pb_list.next, bp.pb_common.pb_list.prev);
+		   bp.pb_target, bp.pb_hold.counter,
+		   bp.pb_list.next, bp.pb_list.prev);
 	kdb_printf("  pb_hash_index %d pb_hash_next 0x%p pb_hash_prev 0x%p\n",
-		   bp.pb_common.pb_hash_index,
-		   bp.pb_common.pb_hash_list.next,
-		   bp.pb_common.pb_hash_list.prev);
+		   bp.pb_hash_index,
+		   bp.pb_hash_list.next,
+		   bp.pb_hash_list.prev);
 	kdb_printf("  pb_file_offset 0x%llx pb_buffer_length 0x%llx pb_addr 0x%p\n",
-		   (unsigned long long) bp.pb_common.pb_file_offset,
-		   (unsigned long long) bp.pb_common.pb_buffer_length,
-		   bp.pb_common.pb_addr);
+		   (unsigned long long) bp.pb_file_offset,
+		   (unsigned long long) bp.pb_buffer_length,
+		   bp.pb_addr);
 	kdb_printf("  pb_bn 0x%Lx pb_count_desired 0x%lx\n",
-		   bp.pb_common.pb_bn,
-		   (unsigned long) bp.pb_common.pb_count_desired);
+		   bp.pb_bn,
+		   (unsigned long) bp.pb_count_desired);
 	kdb_printf("  pb_io_remaining %d pb_error %u\n",
-		   bp.pb_common.pb_io_remaining.counter,
-		   bp.pb_common.pb_error);
+		   bp.pb_io_remaining.counter,
+		   bp.pb_error);
 	kdb_printf("  pb_page_count %u pb_offset 0x%x pb_pages 0x%p\n",
-		bp.pb_common.pb_page_count, bp.pb_common.pb_offset,
-		bp.pb_common.pb_pages);
+		bp.pb_page_count, bp.pb_offset,
+		bp.pb_pages);
 #ifdef PAGEBUF_LOCK_TRACKING
 	kdb_printf("  pb_iodonesema (%d,%d) pb_sema (%d,%d) pincount (%d) last holder %d\n",
-		   bp.pb_common.pb_iodonesema.count.counter,
-		   bp.pb_common.pb_iodonesema.sleepers,
+		   bp.pb_iodonesema.count.counter,
+		   bp.pb_iodonesema.sleepers,
 		   bp.pb_sema.count.counter, bp.pb_sema.sleepers,
 		   bp.pb_pin_count.counter, bp.pb_last_holder);
 #else
 	kdb_printf("  pb_iodonesema (%d,%d) pb_sema (%d,%d) pincount (%d)\n",
-		   bp.pb_common.pb_iodonesema.count.counter,
-		   bp.pb_common.pb_iodonesema.sleepers,
+		   bp.pb_iodonesema.count.counter,
+		   bp.pb_iodonesema.sleepers,
 		   bp.pb_sema.count.counter, bp.pb_sema.sleepers,
 		   bp.pb_pin_count.counter);
 #endif
-	if (bp.pb_common.pb_fspriv || bp.pb_common.pb_fspriv2) {
+	if (bp.pb_fspriv || bp.pb_fspriv2) {
 		kdb_printf(  "pb_fspriv 0x%p pb_fspriv2 0x%p\n",
-			   bp.pb_common.pb_fspriv, bp.pb_common.pb_fspriv2);
+			   bp.pb_fspriv, bp.pb_fspriv2);
 	}
 
 	return 0;

include/linux/fs.h

@@ -1098,15 +1098,20 @@ extern int bd_claim(struct block_device *, void *);
 extern void bd_release(struct block_device *);
 extern void blk_run_queues(void);
 
-/* fs/devices.c */
+/* fs/char_dev.c */
 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 extern int unregister_chrdev(unsigned int, const char *);
 extern int chrdev_open(struct inode *, struct file *);
+
+/* fs/block_dev.c */
 extern const char *__bdevname(dev_t);
 extern inline const char *bdevname(struct block_device *bdev)
 {
 	return __bdevname(bdev->bd_dev);
 }
+extern struct block_device *open_bdev_excl(const char *, int, int, void *);
+extern void close_bdev_excl(struct block_device *, int);
+
 extern const char * cdevname(kdev_t);
 extern const char * kdevname(kdev_t);
 extern void init_special_inode(struct inode *, umode_t, dev_t);

kernel/ksyms.c

@@ -203,6 +203,8 @@ EXPORT_SYMBOL(bdget);
 EXPORT_SYMBOL(bdput);
 EXPORT_SYMBOL(bd_claim);
 EXPORT_SYMBOL(bd_release);
+EXPORT_SYMBOL(open_bdev_excl);
+EXPORT_SYMBOL(close_bdev_excl);
 EXPORT_SYMBOL(__brelse);
 EXPORT_SYMBOL(__bforget);
 EXPORT_SYMBOL(ll_rw_block);