X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fmd%2Fdm-table.c;h=04e5fd742c2c29e42fbba920e1303b889229ccf7;hb=95ea4705746f52e17f1f14f9136ea2106ffe3b26;hp=d2eb3c5936822832f6087acaf8e9d44943530914;hpb=afb24528f9012e5c6361ca9a9128c7c089c1cc7c;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index d2eb3c5..04e5fd7 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -43,7 +43,7 @@ struct dm_table {
 	 * device.  This should be a combination of FMODE_READ
 	 * and FMODE_WRITE.
 	 */
-	int mode;
+	fmode_t mode;
 
 	/* a list of devices used by this table */
 	struct list_head devices;
@@ -217,7 +217,7 @@ static int alloc_targets(struct dm_table *t, unsigned int num)
 	return 0;
 }
 
-int dm_table_create(struct dm_table **result, int mode,
+int dm_table_create(struct dm_table **result, fmode_t mode,
 		    unsigned num_targets, struct mapped_device *md)
 {
 	struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
@@ -245,50 +245,13 @@ int dm_table_create(struct dm_table **result, int mode,
 	return 0;
 }
 
-int dm_create_error_table(struct dm_table **result, struct mapped_device *md)
-{
-	struct dm_table *t;
-	sector_t dev_size = 1;
-	int r;
-
-	/*
-	 * Find current size of device.
-	 * Default to 1 sector if inactive.
-	 */
-	t = dm_get_table(md);
-	if (t) {
-		dev_size = dm_table_get_size(t);
-		dm_table_put(t);
-	}
-
-	r = dm_table_create(&t, FMODE_READ, 1, md);
-	if (r)
-		return r;
-
-	r = dm_table_add_target(t, "error", 0, dev_size, NULL);
-	if (r)
-		goto out;
-
-	r = dm_table_complete(t);
-	if (r)
-		goto out;
-
-	*result = t;
-
-out:
-	if (r)
-		dm_table_put(t);
-
-	return r;
-}
-EXPORT_SYMBOL_GPL(dm_create_error_table);
-
 static void free_devices(struct list_head *devices)
 {
 	struct list_head *tmp, *next;
 
 	list_for_each_safe(tmp, next, devices) {
-		struct dm_dev *dd = list_entry(tmp, struct dm_dev, list);
+		struct dm_dev_internal *dd =
+		    list_entry(tmp, struct dm_dev_internal, list);
 		kfree(dd);
 	}
 }
@@ -350,44 +313,14 @@ static inline int check_space(struct dm_table *t)
 }
 
 /*
- * Convert a device path to a dev_t.
- */
-static int lookup_device(const char *path, dev_t *dev)
-{
-	int r;
-	struct nameidata nd;
-	struct inode *inode;
-
-	if ((r = path_lookup(path, LOOKUP_FOLLOW, &nd)))
-		return r;
-
-	inode = nd.dentry->d_inode;
-	if (!inode) {
-		r = -ENOENT;
-		goto out;
-	}
-
-	if (!S_ISBLK(inode->i_mode)) {
-		r = -ENOTBLK;
-		goto out;
-	}
-
-	*dev = inode->i_rdev;
-
- out:
-	path_release(&nd);
-	return r;
-}
-
-/*
  * See if we've already got a device in the list.
  */
-static struct dm_dev *find_device(struct list_head *l, dev_t dev)
+static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev)
 {
-	struct dm_dev *dd;
+	struct dm_dev_internal *dd;
 
 	list_for_each_entry (dd, l, list)
-		if (dd->bdev->bd_dev == dev)
+		if (dd->dm_dev.bdev->bd_dev == dev)
 			return dd;
 
 	return NULL;
@@ -396,45 +329,47 @@ static struct dm_dev *find_device(struct list_head *l, dev_t dev)
 /*
  * Open a device so we can use it as a map destination.
  */
-static int open_dev(struct dm_dev *d, dev_t dev, struct mapped_device *md)
+static int open_dev(struct dm_dev_internal *d, dev_t dev,
+		    struct mapped_device *md)
 {
 	static char *_claim_ptr = "I belong to device-mapper";
 	struct block_device *bdev;
 
 	int r;
 
-	BUG_ON(d->bdev);
+	BUG_ON(d->dm_dev.bdev);
 
-	bdev = open_by_devnum(dev, d->mode);
+	bdev = open_by_devnum(dev, d->dm_dev.mode);
 	if (IS_ERR(bdev))
 		return PTR_ERR(bdev);
 	r = bd_claim_by_disk(bdev, _claim_ptr, dm_disk(md));
 	if (r)
-		blkdev_put(bdev);
+		blkdev_put(bdev, d->dm_dev.mode);
 	else
-		d->bdev = bdev;
+		d->dm_dev.bdev = bdev;
 	return r;
 }
 
 /*
  * Close a device that we've been using.
  */
-static void close_dev(struct dm_dev *d, struct mapped_device *md)
+static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
 {
-	if (!d->bdev)
+	if (!d->dm_dev.bdev)
 		return;
 
-	bd_release_from_disk(d->bdev, dm_disk(md));
-	blkdev_put(d->bdev);
-	d->bdev = NULL;
+	bd_release_from_disk(d->dm_dev.bdev, dm_disk(md));
+	blkdev_put(d->dm_dev.bdev, d->dm_dev.mode);
+	d->dm_dev.bdev = NULL;
 }
 
 /*
  * If possible, this checks an area of a destination device is valid.
  */
-static int check_device_area(struct dm_dev *dd, sector_t start, sector_t len)
+static int check_device_area(struct dm_dev_internal *dd, sector_t start,
+			     sector_t len)
 {
-	sector_t dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;
+	sector_t dev_size = dd->dm_dev.bdev->bd_inode->i_size >> SECTOR_SHIFT;
 
 	if (!dev_size)
 		return 1;
@@ -447,16 +382,17 @@ static int check_device_area(struct dm_dev *dd, sector_t start, sector_t len)
  * careful to leave things as they were if we fail to reopen the
  * device.
  */
-static int upgrade_mode(struct dm_dev *dd, int new_mode, struct mapped_device *md)
+static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
+			struct mapped_device *md)
 {
 	int r;
-	struct dm_dev dd_copy;
-	dev_t dev = dd->bdev->bd_dev;
+	struct dm_dev_internal dd_copy;
+	dev_t dev = dd->dm_dev.bdev->bd_dev;
 
 	dd_copy = *dd;
 
-	dd->mode |= new_mode;
-	dd->bdev = NULL;
+	dd->dm_dev.mode |= new_mode;
+	dd->dm_dev.bdev = NULL;
 	r = open_dev(dd, dev, md);
 	if (!r)
 		close_dev(&dd_copy, md);
@@ -472,11 +408,11 @@ static int upgrade_mode(struct dm_dev *dd, int new_mode, struct mapped_device *m
  */
 static int __table_get_device(struct dm_table *t, struct dm_target *ti,
 			      const char *path, sector_t start, sector_t len,
-			      int mode, struct dm_dev **result)
+			      fmode_t mode, struct dm_dev **result)
 {
 	int r;
-	dev_t dev;
-	struct dm_dev *dd;
+	dev_t uninitialized_var(dev);
+	struct dm_dev_internal *dd;
 	unsigned int major, minor;
 
 	BUG_ON(!t);
@@ -488,8 +424,12 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
 			return -EOVERFLOW;
 	} else {
 		/* convert the path to a device */
-		if ((r = lookup_device(path, &dev)))
-			return r;
+		struct block_device *bdev = lookup_bdev(path);
+
+		if (IS_ERR(bdev))
+			return PTR_ERR(bdev);
+		dev = bdev->bd_dev;
+		bdput(bdev);
 	}
 
 	dd = find_device(&t->devices, dev);
@@ -498,20 +438,20 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
 		if (!dd)
 			return -ENOMEM;
 
-		dd->mode = mode;
-		dd->bdev = NULL;
+		dd->dm_dev.mode = mode;
+		dd->dm_dev.bdev = NULL;
 
 		if ((r = open_dev(dd, dev, t->md))) {
 			kfree(dd);
 			return r;
 		}
 
-		format_dev_t(dd->name, dev);
+		format_dev_t(dd->dm_dev.name, dev);
 
 		atomic_set(&dd->count, 0);
 		list_add(&dd->list, &t->devices);
 
-	} else if (dd->mode != (mode | dd->mode)) {
+	} else if (dd->dm_dev.mode != (mode | dd->dm_dev.mode)) {
 		r = upgrade_mode(dd, mode, t->md);
 		if (r)
 			return r;
@@ -520,11 +460,11 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
 
 	if (!check_device_area(dd, start, len)) {
 		DMWARN("device %s too small for target", path);
-		dm_put_device(ti, dd);
+		dm_put_device(ti, &dd->dm_dev);
 		return -EINVAL;
 	}
 
-	*result = dd;
+	*result = &dd->dm_dev;
 
 	return 0;
 }
@@ -533,6 +473,13 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
 {
 	struct request_queue *q = bdev_get_queue(bdev);
 	struct io_restrictions *rs = &ti->limits;
+	char b[BDEVNAME_SIZE];
+
+	if (unlikely(!q)) {
+		DMWARN("%s: Cannot set limits for nonexistent device %s",
+		       dm_device_name(ti->table->md), bdevname(bdev, b));
+		return;
+	}
 
 	/*
 	 * Combine the device limits low.
@@ -544,14 +491,13 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
 	rs->max_sectors =
 		min_not_zero(rs->max_sectors, q->max_sectors);
 
-	/* FIXME: Device-Mapper on top of RAID-0 breaks because DM
-	 *        currently doesn't honor MD's merge_bvec_fn routine.
-	 *        In this case, we'll force DM to use PAGE_SIZE or
-	 *        smaller I/O, just to be safe. A better fix is in the
-	 *        works, but add this for the time being so it will at
-	 *        least operate correctly.
+	/*
+	 * Check if merge fn is supported.
+	 * If not we'll force DM to use PAGE_SIZE or
+	 * smaller I/O, just to be safe.
 	 */
-	if (q->merge_bvec_fn)
+
+	if (q->merge_bvec_fn && !ti->type->merge)
 		rs->max_sectors =
 			min_not_zero(rs->max_sectors,
 				     (unsigned int) (PAGE_SIZE >> 9));
@@ -582,7 +528,7 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
 EXPORT_SYMBOL_GPL(dm_set_device_limits);
 
 int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
-		  sector_t len, int mode, struct dm_dev **result)
+		  sector_t len, fmode_t mode, struct dm_dev **result)
 {
 	int r = __table_get_device(ti->table, ti, path,
 				   start, len, mode, result);
@@ -596,8 +542,11 @@ int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
 /*
  * Decrement a devices use count and remove it if necessary.
  */
-void dm_put_device(struct dm_target *ti, struct dm_dev *dd)
+void dm_put_device(struct dm_target *ti, struct dm_dev *d)
 {
+	struct dm_dev_internal *dd = container_of(d, struct dm_dev_internal,
+						  dm_dev);
+
 	if (atomic_dec_and_test(&dd->count)) {
 		close_dev(dd, ti->table->md);
 		list_del(&dd->list);
@@ -719,7 +668,7 @@ static void check_for_valid_limits(struct io_restrictions *rs)
 	if (!rs->max_segment_size)
 		rs->max_segment_size = MAX_SEGMENT_SIZE;
 	if (!rs->seg_boundary_mask)
-		rs->seg_boundary_mask = -1;
+		rs->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
 	if (!rs->bounce_pfn)
 		rs->bounce_pfn = -1;
 }
@@ -804,7 +753,7 @@ static int setup_indexes(struct dm_table *t)
 		return -ENOMEM;
 
 	/* set up internal nodes, bottom-up */
-	for (i = t->depth - 2, total = 0; i >= 0; i--) {
+	for (i = t->depth - 2; i >= 0; i--) {
 		t->index[i] = indexes;
 		indexes += (KEYS_PER_NODE * t->counts[i]);
 		setup_btree_index(i, t);
@@ -911,10 +860,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
 	q->max_hw_sectors = t->limits.max_hw_sectors;
 	q->seg_boundary_mask = t->limits.seg_boundary_mask;
 	q->bounce_pfn = t->limits.bounce_pfn;
+
 	if (t->limits.no_cluster)
-		q->queue_flags &= ~(1 << QUEUE_FLAG_CLUSTER);
+		queue_flag_clear_unlocked(QUEUE_FLAG_CLUSTER, q);
 	else
-		q->queue_flags |= (1 << QUEUE_FLAG_CLUSTER);
+		queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, q);
 
 }
 
@@ -928,7 +878,7 @@ struct list_head *dm_table_get_devices(struct dm_table *t)
 	return &t->devices;
 }
 
-int dm_table_get_mode(struct dm_table *t)
+fmode_t dm_table_get_mode(struct dm_table *t)
 {
 	return t->mode;
 }
@@ -954,7 +904,7 @@ void dm_table_presuspend_targets(struct dm_table *t)
 	if (!t)
 		return;
 
-	return suspend_targets(t, 0);
+	suspend_targets(t, 0);
 }
 
 void dm_table_postsuspend_targets(struct dm_table *t)
@@ -962,7 +912,7 @@ void dm_table_postsuspend_targets(struct dm_table *t)
 	if (!t)
 		return;
 
-	return suspend_targets(t, 1);
+	suspend_targets(t, 1);
 }
 
 int dm_table_resume_targets(struct dm_table *t)
@@ -992,13 +942,20 @@ int dm_table_resume_targets(struct dm_table *t)
 
 int dm_table_any_congested(struct dm_table *t, int bdi_bits)
 {
-	struct dm_dev *dd;
+	struct dm_dev_internal *dd;
 	struct list_head *devices = dm_table_get_devices(t);
 	int r = 0;
 
 	list_for_each_entry(dd, devices, list) {
-		struct request_queue *q = bdev_get_queue(dd->bdev);
-		r |= bdi_congested(&q->backing_dev_info, bdi_bits);
+		struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev);
+		char b[BDEVNAME_SIZE];
+
+		if (likely(q))
+			r |= bdi_congested(&q->backing_dev_info, bdi_bits);
+		else
+			DMWARN_LIMIT("%s: any_congested: nonexistent device %s",
+				     dm_device_name(t->md),
+				     bdevname(dd->dm_dev.bdev, b));
 	}
 
 	return r;
@@ -1006,13 +963,19 @@ int dm_table_any_congested(struct dm_table *t, int bdi_bits)
 
 void dm_table_unplug_all(struct dm_table *t)
 {
-	struct dm_dev *dd;
+	struct dm_dev_internal *dd;
 	struct list_head *devices = dm_table_get_devices(t);
 
 	list_for_each_entry(dd, devices, list) {
-		struct request_queue *q = bdev_get_queue(dd->bdev);
-
-		blk_unplug(q);
+		struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev);
+		char b[BDEVNAME_SIZE];
+
+		if (likely(q))
+			blk_unplug(q);
+		else
+			DMWARN_LIMIT("%s: Cannot unplug nonexistent device %s",
+				     dm_device_name(t->md),
+				     bdevname(dd->dm_dev.bdev, b));
 	}
 }