28 files changed, 377 insertions, 719 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
index 3d866d0037f2..fefa9a496708 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -295,11 +295,12 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                         return -EINVAL;
                 if (get_user(n, (int __user *) arg))
                         return -EFAULT;
-                if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
+                if (!(mode & FMODE_EXCL) &&
+                    blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
                         return -EBUSY;
                 ret = set_blocksize(bdev, n);
                 if (!(mode & FMODE_EXCL))
-                        bd_release(bdev);
+                        blkdev_put(bdev, mode | FMODE_EXCL);
                 return ret;
         case BLKPG:
                 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 1ea1a34e78b2..3803a0348937 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -911,8 +911,6 @@ struct drbd_md {
 struct drbd_backing_dev {
         struct block_device *backing_bdev;
         struct block_device *md_bdev;
-        struct file *lo_file;
-        struct file *md_file;
         struct drbd_md md;
         struct disk_conf dc; /* The user provided config... */
         sector_t known_size; /* last known size of that backing device */
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 6be5401d0e88..29cd0dc9fe4f 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3372,11 +3372,8 @@ void drbd_free_bc(struct drbd_backing_dev *ldev)
         if (ldev == NULL)
                 return;
 
-        bd_release(ldev->backing_bdev);
-        bd_release(ldev->md_bdev);
-
-        fput(ldev->lo_file);
-        fput(ldev->md_file);
+        blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+        blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
 
         kfree(ldev);
 }
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 29e5c70e4e26..8cbfaa687d72 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -855,7 +855,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
         sector_t max_possible_sectors;
         sector_t min_md_device_sectors;
         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
-        struct inode *inode, *inode2;
+        struct block_device *bdev;
         struct lru_cache *resync_lru = NULL;
         union drbd_state ns, os;
         unsigned int max_seg_s;
@@ -907,46 +907,40 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
                 }
         }
 
-        nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
-        if (IS_ERR(nbc->lo_file)) {
+        bdev = blkdev_get_by_path(nbc->dc.backing_dev,
+                                  FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
+        if (IS_ERR(bdev)) {
                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
-                    PTR_ERR(nbc->lo_file));
-                nbc->lo_file = NULL;
+                        PTR_ERR(bdev));
                 retcode = ERR_OPEN_DISK;
                 goto fail;
         }
+        nbc->backing_bdev = bdev;
 
-        inode = nbc->lo_file->f_dentry->d_inode;
-
-        if (!S_ISBLK(inode->i_mode)) {
-                retcode = ERR_DISK_NOT_BDEV;
-                goto fail;
-        }
-
-        nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
-        if (IS_ERR(nbc->md_file)) {
+        /*
+         * meta_dev_idx >= 0: external fixed size, possibly multiple
+         * drbd sharing one meta device.  TODO in that case, paranoia
+         * check that [md_bdev, meta_dev_idx] is not yet used by some
+         * other drbd minor!  (if you use drbd.conf + drbdadm, that
+         * should check it for you already; but if you don't, or
+         * someone fooled it, we need to double check here)
+         */
+        bdev = blkdev_get_by_path(nbc->dc.meta_dev,
+                                  FMODE_READ | FMODE_WRITE | FMODE_EXCL,
+                                  (nbc->dc.meta_dev_idx < 0) ?
+                                  (void *)mdev : (void *)drbd_m_holder);
+        if (IS_ERR(bdev)) {
                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
-                    PTR_ERR(nbc->md_file));
-                nbc->md_file = NULL;
+                        PTR_ERR(bdev));
                 retcode = ERR_OPEN_MD_DISK;
                 goto fail;
         }
+        nbc->md_bdev = bdev;
 
-        inode2 = nbc->md_file->f_dentry->d_inode;
-
-        if (!S_ISBLK(inode2->i_mode)) {
-                retcode = ERR_MD_NOT_BDEV;
-                goto fail;
-        }
-
-        nbc->backing_bdev = inode->i_bdev;
-        if (bd_claim(nbc->backing_bdev, mdev)) {
-                printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
-                       nbc->backing_bdev, mdev,
-                       nbc->backing_bdev->bd_holder,
-                       nbc->backing_bdev->bd_contains->bd_holder,
-                       nbc->backing_bdev->bd_holders);
-                retcode = ERR_BDCLAIM_DISK;
+        if ((nbc->backing_bdev == nbc->md_bdev) !=
+            (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
+             nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
+                retcode = ERR_MD_IDX_INVALID;
                 goto fail;
         }
 
@@ -955,28 +949,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
                         offsetof(struct bm_extent, lce));
         if (!resync_lru) {
                 retcode = ERR_NOMEM;
-                goto release_bdev_fail;
-        }
-
-        /* meta_dev_idx >= 0: external fixed size,
-         * possibly multiple drbd sharing one meta device.
-         * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
-         * not yet used by some other drbd minor!
-         * (if you use drbd.conf + drbdadm,
-         * that should check it for you already; but if you don't, or someone
-         * fooled it, we need to double check here) */
-        nbc->md_bdev = inode2->i_bdev;
-        if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
-                                : (void *) drbd_m_holder)) {
-                retcode = ERR_BDCLAIM_MD_DISK;
-                goto release_bdev_fail;
-        }
-
-        if ((nbc->backing_bdev == nbc->md_bdev) !=
-            (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
-             nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
-                retcode = ERR_MD_IDX_INVALID;
-                goto release_bdev2_fail;
+                goto fail;
         }
 
         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
@@ -987,7 +960,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
                         (unsigned long long) drbd_get_max_capacity(nbc),
                         (unsigned long long) nbc->dc.disk_size);
                 retcode = ERR_DISK_TO_SMALL;
-                goto release_bdev2_fail;
+                goto fail;
         }
 
         if (nbc->dc.meta_dev_idx < 0) {
@@ -1004,7 +977,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
                 dev_warn(DEV, "refusing attach: md-device too small, "
                      "at least %llu sectors needed for this meta-disk type\n",
                      (unsigned long long) min_md_device_sectors);
-                goto release_bdev2_fail;
+                goto fail;
         }
 
         /* Make sure the new disk is big enough
@@ -1012,7 +985,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
         if (drbd_get_max_capacity(nbc) <
             drbd_get_capacity(mdev->this_bdev)) {
                 retcode = ERR_DISK_TO_SMALL;
-                goto release_bdev2_fail;
+                goto fail;
         }
 
         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
@@ -1035,7 +1008,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
         retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
         drbd_resume_io(mdev);
         if (retcode < SS_SUCCESS)
-                goto release_bdev2_fail;
+                goto fail;
 
         if (!get_ldev_if_state(mdev, D_ATTACHING))
                 goto force_diskless;
@@ -1269,18 +1242,14 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
  force_diskless:
         drbd_force_state(mdev, NS(disk, D_FAILED));
         drbd_md_sync(mdev);
- release_bdev2_fail:
-        if (nbc)
-                bd_release(nbc->md_bdev);
- release_bdev_fail:
-        if (nbc)
-                bd_release(nbc->backing_bdev);
  fail:
         if (nbc) {
-                if (nbc->lo_file)
-                        fput(nbc->lo_file);
-                if (nbc->md_file)
-                        fput(nbc->md_file);
+                if (nbc->backing_bdev)
+                        blkdev_put(nbc->backing_bdev,
+                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+                if (nbc->md_bdev)
+                        blkdev_put(nbc->md_bdev,
+                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL);
                 kfree(nbc);
         }
         lc_destroy(resync_lru);
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 19b3568e9326..77d70eebb6b2 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2296,15 +2296,12 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
          * so bdget() can't fail.
          */
         bdget(pd->bdev->bd_dev);
-        if ((ret = blkdev_get(pd->bdev, FMODE_READ)))
+        if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd)))
                 goto out;
 
-        if ((ret = bd_claim(pd->bdev, pd)))
-                goto out_putdev;
-
         if ((ret = pkt_get_last_written(pd, &lba))) {
                 printk(DRIVER_NAME": pkt_get_last_written failed\n");
-                goto out_unclaim;
+                goto out_putdev;
         }
 
         set_capacity(pd->disk, lba << 2);
@@ -2314,7 +2311,7 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
         q = bdev_get_queue(pd->bdev);
         if (write) {
                 if ((ret = pkt_open_write(pd)))
-                        goto out_unclaim;
+                        goto out_putdev;
                 /*
                  * Some CDRW drives can not handle writes larger than one packet,
                  * even if the size is a multiple of the packet size.
@@ -2329,23 +2326,21 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
         }
 
         if ((ret = pkt_set_segment_merging(pd, q)))
-                goto out_unclaim;
+                goto out_putdev;
 
         if (write) {
                 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
                         printk(DRIVER_NAME": not enough memory for buffers\n");
                         ret = -ENOMEM;
-                        goto out_unclaim;
+                        goto out_putdev;
                 }
                 printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
         }
 
         return 0;
 
-out_unclaim:
-        bd_release(pd->bdev);
 out_putdev:
-        blkdev_put(pd->bdev, FMODE_READ);
+        blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
 out:
         return ret;
 }
@@ -2362,8 +2357,7 @@ static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
         pkt_lock_door(pd, 0);
 
         pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
-        bd_release(pd->bdev);
-        blkdev_put(pd->bdev, FMODE_READ);
+        blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
 
         pkt_shrink_pktlist(pd);
 }
@@ -2733,7 +2727,7 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
         bdev = bdget(dev);
         if (!bdev)
                 return -ENOMEM;
-        ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY);
+        ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
         if (ret)
                 return ret;
 
diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index bfe25ea9766b..b4b9d5a47885 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -65,15 +65,12 @@ static int raw_open(struct inode *inode, struct file *filp)
         if (!bdev)
                 goto out;
         igrab(bdev->bd_inode);
-        err = blkdev_get(bdev, filp->f_mode);
+        err = blkdev_get(bdev, filp->f_mode | FMODE_EXCL, raw_open);
         if (err)
                 goto out;
-        err = bd_claim(bdev, raw_open);
-        if (err)
-                goto out1;
         err = set_blocksize(bdev, bdev_logical_block_size(bdev));
         if (err)
-                goto out2;
+                goto out1;
         filp->f_flags |= O_DIRECT;
         filp->f_mapping = bdev->bd_inode->i_mapping;
         if (++raw_devices[minor].inuse == 1)
@@ -83,10 +80,8 @@ static int raw_open(struct inode *inode, struct file *filp)
         mutex_unlock(&raw_mutex);
         return 0;
 
-out2:
-        bd_release(bdev);
 out1:
-        blkdev_put(bdev, filp->f_mode);
+        blkdev_put(bdev, filp->f_mode | FMODE_EXCL);
 out:
         mutex_unlock(&raw_mutex);
         return err;
@@ -110,8 +105,7 @@ static int raw_release(struct inode *inode, struct file *filp)
         }
         mutex_unlock(&raw_mutex);
 
-        bd_release(bdev);
-        blkdev_put(bdev, filp->f_mode);
+        blkdev_put(bdev, filp->f_mode | FMODE_EXCL);
         return 0;
 }
 
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 90267f8d64ee..67150c32986c 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -325,15 +325,18 @@ static int open_dev(struct dm_dev_internal *d, dev_t dev,
 
         BUG_ON(d->dm_dev.bdev);
 
-        bdev = open_by_devnum(dev, d->dm_dev.mode);
+        bdev = blkdev_get_by_dev(dev, d->dm_dev.mode | FMODE_EXCL, _claim_ptr);
         if (IS_ERR(bdev))
                 return PTR_ERR(bdev);
-        r = bd_claim_by_disk(bdev, _claim_ptr, dm_disk(md));
-        if (r)
-                blkdev_put(bdev, d->dm_dev.mode);
-        else
-                d->dm_dev.bdev = bdev;
-        return r;
+
+        r = bd_link_disk_holder(bdev, dm_disk(md));
+        if (r) {
+                blkdev_put(bdev, d->dm_dev.mode | FMODE_EXCL);
+                return r;
+        }
+
+        d->dm_dev.bdev = bdev;
+        return 0;
 }
 
 /*
@@ -344,8 +347,7 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
         if (!d->dm_dev.bdev)
                 return;
 
-        bd_release_from_disk(d->dm_dev.bdev, dm_disk(md));
-        blkdev_put(d->dm_dev.bdev, d->dm_dev.mode);
+        blkdev_put(d->dm_dev.bdev, d->dm_dev.mode | FMODE_EXCL);
         d->dm_dev.bdev = NULL;
 }
 
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 324a3663fcda..3bacccab1b8c 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1880,7 +1880,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
         rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
 
         list_add_rcu(&rdev->same_set, &mddev->disks);
-        bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
+        bd_link_disk_holder(rdev->bdev, mddev->gendisk);
 
         /* May as well allow recovery to be retried once */
         mddev->recovery_disabled = 0;
@@ -1907,7 +1907,6 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
                 MD_BUG();
                 return;
         }
-        bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
         list_del_rcu(&rdev->same_set);
         printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
         rdev->mddev = NULL;
@@ -1935,19 +1934,13 @@ static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
         struct block_device *bdev;
         char b[BDEVNAME_SIZE];
 
-        bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
+        bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+                                 shared ? (mdk_rdev_t *)lock_rdev : rdev);
         if (IS_ERR(bdev)) {
                 printk(KERN_ERR "md: could not open %s.\n",
                         __bdevname(dev, b));
                 return PTR_ERR(bdev);
         }
-        err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
-        if (err) {
-                printk(KERN_ERR "md: could not bd_claim %s.\n",
-                        bdevname(bdev, b));
-                blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
-                return err;
-        }
         if (!shared)
                 set_bit(AllReserved, &rdev->flags);
         rdev->bdev = bdev;
@@ -1960,8 +1953,7 @@ static void unlock_rdev(mdk_rdev_t *rdev)
         rdev->bdev = NULL;
         if (!bdev)
                 MD_BUG();
-        bd_release(bdev);
-        blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
+        blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 }
 
 void md_autodetect_dev(dev_t dev);
diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index 2cf0cc6a4189..f29a6f9df6e7 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -224,7 +224,7 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
         if (dev->blkdev) {
                 invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
                                         0, -1);
-                close_bdev_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
+                blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
         }
 
         kfree(dev);
@@ -234,6 +234,7 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
 /* FIXME: ensure that mtd->size % erase_size == 0 */
 static struct block2mtd_dev *add_device(char *devname, int erase_size)
 {
+        const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
         struct block_device *bdev;
         struct block2mtd_dev *dev;
         char *name;
@@ -246,7 +247,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
                 return NULL;
 
         /* Get a handle on the device */
-        bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, NULL);
+        bdev = blkdev_get_by_path(devname, mode, dev);
 #ifndef MODULE
         if (IS_ERR(bdev)) {
 
@@ -254,9 +255,8 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
                    to resolve the device name by other means. */
 
                 dev_t devt = name_to_dev_t(devname);
-                if (devt) {
-                        bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
-                }
+                if (devt)
+                        bdev = blkdev_get_by_dev(devt, mode, dev);
         }
 #endif
 
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 30a1ca3d08b7..5505bc07e1e7 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -103,7 +103,7 @@ int dasd_scan_partitions(struct dasd_block *block)
         struct block_device *bdev;
 
         bdev = bdget_disk(block->gdp, 0);
-        if (!bdev || blkdev_get(bdev, FMODE_READ) < 0)
+        if (!bdev || blkdev_get(bdev, FMODE_READ, NULL) < 0)
                 return -ENODEV;
         /*
          * See fs/partition/check.c:register_disk,rescan_partitions
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 3b513bafaf2a..b015561fd602 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -543,7 +543,7 @@ static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
         ro = curlun->initially_ro;
         if (!ro) {
                 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
-                if (-EROFS == PTR_ERR(filp))
+                if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES)
                         ro = 1;
         }
         if (ro)
@@ -558,10 +558,7 @@ static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
 
         if (filp->f_path.dentry)
                 inode = filp->f_path.dentry->d_inode;
-        if (inode && S_ISBLK(inode->i_mode)) {
-                if (bdev_read_only(inode->i_bdev))
-                        ro = 1;
-        } else if (!inode || !S_ISREG(inode->i_mode)) {
+        if (!inode || (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) {
                 LINFO(curlun, "invalid file type: %s\n", filename);
                 goto out;
         }
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 06e8ff12b97c..c1c1b8c3fb99 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -426,9 +426,6 @@ static void init_once(void *foo)
         mutex_init(&bdev->bd_mutex);
         INIT_LIST_HEAD(&bdev->bd_inodes);
         INIT_LIST_HEAD(&bdev->bd_list);
-#ifdef CONFIG_SYSFS
-        INIT_LIST_HEAD(&bdev->bd_holder_list);
-#endif
         inode_init_once(&ei->vfs_inode);
         /* Initialize mutex for freeze. */
         mutex_init(&bdev->bd_fsfreeze_mutex);
@@ -663,7 +660,7 @@ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole,
         else if (bdev->bd_contains == bdev)
                 return true;     /* is a whole device which isn't held */
 
-        else if (whole->bd_holder == bd_claim)
+        else if (whole->bd_holder == bd_may_claim)
                 return true;     /* is a partition of a device that is being partitioned */
         else if (whole->bd_holder != NULL)
                 return false;    /* is a partition of a held device */
@@ -775,439 +772,87 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
         }
 }
 
-/* releases bdev_lock */
-static void __bd_abort_claiming(struct block_device *whole, void *holder)
-{
-        BUG_ON(whole->bd_claiming != holder);
-        whole->bd_claiming = NULL;
-        wake_up_bit(&whole->bd_claiming, 0);
-
-        spin_unlock(&bdev_lock);
-        bdput(whole);
-}
-
-/**
- * bd_abort_claiming - abort claiming a block device
- * @whole: whole block device returned by bd_start_claiming()
- * @holder: holder trying to claim @bdev
- *
- * Abort a claiming block started by bd_start_claiming().  Note that
- * @whole is not the block device to be claimed but the whole device
- * returned by bd_start_claiming().
- *
- * CONTEXT:
- * Grabs and releases bdev_lock.
- */
-static void bd_abort_claiming(struct block_device *whole, void *holder)
-{
-        spin_lock(&bdev_lock);
-        __bd_abort_claiming(whole, holder);             /* releases bdev_lock */
-}
-
-/* increment holders when we have a legitimate claim. requires bdev_lock */
-static void __bd_claim(struct block_device *bdev, struct block_device *whole,
-                                        void *holder)
-{
-        /* note that for a whole device bd_holders
-         * will be incremented twice, and bd_holder will
-         * be set to bd_claim before being set to holder
-         */
-        whole->bd_holders++;
-        whole->bd_holder = bd_claim;
-        bdev->bd_holders++;
-        bdev->bd_holder = holder;
-}
-
-/**
- * bd_finish_claiming - finish claiming a block device
- * @bdev: block device of interest (passed to bd_start_claiming())
- * @whole: whole block device returned by bd_start_claiming()
- * @holder: holder trying to claim @bdev
- *
- * Finish a claiming block started by bd_start_claiming().
- *
- * CONTEXT:
- * Grabs and releases bdev_lock.
- */
-static void bd_finish_claiming(struct block_device *bdev,
-                                struct block_device *whole, void *holder)
-{
-        spin_lock(&bdev_lock);
-        BUG_ON(!bd_may_claim(bdev, whole, holder));
-        __bd_claim(bdev, whole, holder);
-        __bd_abort_claiming(whole, holder); /* not actually an abort */
-}
-
-/**
- * bd_claim - claim a block device
- * @bdev: block device to claim
- * @holder: holder trying to claim @bdev
- *
- * Try to claim @bdev which must have been opened successfully.
- *
- * CONTEXT:
- * Might sleep.
- *
- * RETURNS:
- * 0 if successful, -EBUSY if @bdev is already claimed.
- */
-int bd_claim(struct block_device *bdev, void *holder)
-{
-        struct block_device *whole = bdev->bd_contains;
-        int res;
-
-        might_sleep();
-
-        spin_lock(&bdev_lock);
-        res = bd_prepare_to_claim(bdev, whole, holder);
-        if (res == 0)
-                __bd_claim(bdev, whole, holder);
-        spin_unlock(&bdev_lock);
-
-        return res;
-}
-EXPORT_SYMBOL(bd_claim);
-
-void bd_release(struct block_device *bdev)
-{
-        spin_lock(&bdev_lock);
-        if (!--bdev->bd_contains->bd_holders)
-                bdev->bd_contains->bd_holder = NULL;
-        if (!--bdev->bd_holders)
-                bdev->bd_holder = NULL;
-        spin_unlock(&bdev_lock);
-}
-
-EXPORT_SYMBOL(bd_release);
-
 #ifdef CONFIG_SYSFS
-/*
- * Functions for bd_claim_by_kobject / bd_release_from_kobject
- *
- *     If a kobject is passed to bd_claim_by_kobject()
- *     and the kobject has a parent directory,
- *     following symlinks are created:
- *        o from the kobject to the claimed bdev
- *        o from "holders" directory of the bdev to the parent of the kobject
- *     bd_release_from_kobject() removes these symlinks.
- *
- *     Example:
- *        If /dev/dm-0 maps to /dev/sda, kobject corresponding to
- *        /sys/block/dm-0/slaves is passed to bd_claim_by_kobject(), then:
- *           /sys/block/dm-0/slaves/sda --> /sys/block/sda
- *           /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
- */
-
 static int add_symlink(struct kobject *from, struct kobject *to)
 {
-        if (!from || !to)
-                return 0;
         return sysfs_create_link(from, to, kobject_name(to));
 }
 
 static void del_symlink(struct kobject *from, struct kobject *to)
 {
-        if (!from || !to)
-                return;
         sysfs_remove_link(from, kobject_name(to));
 }
 
-/*
- * 'struct bd_holder' contains pointers to kobjects symlinked by
- * bd_claim_by_kobject.
- * It's connected to bd_holder_list which is protected by bdev->bd_sem.
- */
-struct bd_holder {
-        struct list_head list;  /* chain of holders of the bdev */
-        int count;              /* references from the holder */
-        struct kobject *sdir;   /* holder object, e.g. "/block/dm-0/slaves" */
-        struct kobject *hdev;   /* e.g. "/block/dm-0" */
-        struct kobject *hdir;   /* e.g. "/block/sda/holders" */
-        struct kobject *sdev;   /* e.g. "/block/sda" */
-};
-
-/*
- * Get references of related kobjects at once.
- * Returns 1 on success. 0 on failure.
- *
- * Should call bd_holder_release_dirs() after successful use.
- */
-static int bd_holder_grab_dirs(struct block_device *bdev,
-                        struct bd_holder *bo)
-{
-        if (!bdev || !bo)
-                return 0;
-
-        bo->sdir = kobject_get(bo->sdir);
-        if (!bo->sdir)
-                return 0;
-
-        bo->hdev = kobject_get(bo->sdir->parent);
-        if (!bo->hdev)
-                goto fail_put_sdir;
-
-        bo->sdev = kobject_get(&part_to_dev(bdev->bd_part)->kobj);
-        if (!bo->sdev)
-                goto fail_put_hdev;
-
-        bo->hdir = kobject_get(bdev->bd_part->holder_dir);
-        if (!bo->hdir)
-                goto fail_put_sdev;
-
-        return 1;
-
-fail_put_sdev:
-        kobject_put(bo->sdev);
-fail_put_hdev:
-        kobject_put(bo->hdev);
-fail_put_sdir:
-        kobject_put(bo->sdir);
-
-        return 0;
-}
-
-/* Put references of related kobjects at once. */
-static void bd_holder_release_dirs(struct bd_holder *bo)
-{
-        kobject_put(bo->hdir);
-        kobject_put(bo->sdev);
-        kobject_put(bo->hdev);
-        kobject_put(bo->sdir);
-}
-
-static struct bd_holder *alloc_bd_holder(struct kobject *kobj)
-{
-        struct bd_holder *bo;
-
-        bo = kzalloc(sizeof(*bo), GFP_KERNEL);
-        if (!bo)
-                return NULL;
-
-        bo->count = 1;
-        bo->sdir = kobj;
-
-        return bo;
-}
-
-static void free_bd_holder(struct bd_holder *bo)
-{
-        kfree(bo);
-}
-
-/**
- * find_bd_holder - find matching struct bd_holder from the block device
- *
- * @bdev:       struct block device to be searched
- * @bo:         target struct bd_holder
- *
- * Returns matching entry with @bo in @bdev->bd_holder_list.
- * If found, increment the reference count and return the pointer.
- * If not found, returns NULL.
- */
-static struct bd_holder *find_bd_holder(struct block_device *bdev,
-                                        struct bd_holder *bo)
-{
-        struct bd_holder *tmp;
-
-        list_for_each_entry(tmp, &bdev->bd_holder_list, list)
-                if (tmp->sdir == bo->sdir) {
-                        tmp->count++;
-                        return tmp;
-                }
-
-        return NULL;
-}
-
 /**
- * add_bd_holder - create sysfs symlinks for bd_claim() relationship
- *
- * @bdev:       block device to be bd_claimed
- * @bo:         preallocated and initialized by alloc_bd_holder()
+ * bd_link_disk_holder - create symlinks between holding disk and slave bdev
+ * @bdev: the claimed slave bdev
+ * @disk: the holding disk
  *
- * Add @bo to @bdev->bd_holder_list, create symlinks.
- *
- * Returns 0 if symlinks are created.
- * Returns -ve if something fails.
- */
-static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
-{
-        int err;
-
-        if (!bo)
-                return -EINVAL;
-
-        if (!bd_holder_grab_dirs(bdev, bo))
-                return -EBUSY;
-
-        err = add_symlink(bo->sdir, bo->sdev);
-        if (err)
-                return err;
-
-        err = add_symlink(bo->hdir, bo->hdev);
-        if (err) {
-                del_symlink(bo->sdir, bo->sdev);
-                return err;
-        }
-
-        list_add_tail(&bo->list, &bdev->bd_holder_list);
-        return 0;
-}
-
-/**
- * del_bd_holder - delete sysfs symlinks for bd_claim() relationship
+ * This functions creates the following sysfs symlinks.
  *
- * @bdev:       block device to be bd_claimed
- * @kobj:       holder's kobject
+ * - from "slaves" directory of the holder @disk to the claimed @bdev
+ * - from "holders" directory of the @bdev to the holder @disk
  *
- * If there is matching entry with @kobj in @bdev->bd_holder_list
- * and no other bd_claim() from the same kobject,
- * remove the struct bd_holder from the list, delete symlinks for it.
+ * For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is
+ * passed to bd_link_disk_holder(), then:
  *
- * Returns a pointer to the struct bd_holder when it's removed from the list
- * and ready to be freed.
- * Returns NULL if matching claim isn't found or there is other bd_claim()
- * by the same kobject.
- */
-static struct bd_holder *del_bd_holder(struct block_device *bdev,
-                                        struct kobject *kobj)
-{
-        struct bd_holder *bo;
-
-        list_for_each_entry(bo, &bdev->bd_holder_list, list) {
-                if (bo->sdir == kobj) {
-                        bo->count--;
-                        BUG_ON(bo->count < 0);
-                        if (!bo->count) {
-                                list_del(&bo->list);
-                                del_symlink(bo->sdir, bo->sdev);
-                                del_symlink(bo->hdir, bo->hdev);
-                                bd_holder_release_dirs(bo);
-                                return bo;
-                        }
-                        break;
-                }
-        }
-
-        return NULL;
-}
-
-/**
- * bd_claim_by_kobject - bd_claim() with additional kobject signature
+ *   /sys/block/dm-0/slaves/sda --> /sys/block/sda
+ *   /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
  *
- * @bdev:       block device to be claimed
- * @holder:     holder's signature
- * @kobj:       holder's kobject
+ * The caller must have claimed @bdev before calling this function and
+ * ensure that both @bdev and @disk are valid during the creation and
+ * lifetime of these symlinks.
  *
- * Do bd_claim() and if it succeeds, create sysfs symlinks between
- * the bdev and the holder's kobject.
- * Use bd_release_from_kobject() when relesing the claimed bdev.
+ * CONTEXT:
+ * Might sleep.
  *
- * Returns 0 on success. (same as bd_claim())
- * Returns errno on failure.
+ * RETURNS:
+ * 0 on success, -errno on failure.
  */
-static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
-                                struct kobject *kobj)
+int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk)
 {
-        int err;
-        struct bd_holder *bo, *found;
-
-        if (!kobj)
-                return -EINVAL;
-
-        bo = alloc_bd_holder(kobj);
-        if (!bo)
-                return -ENOMEM;
+        int ret = 0;
 
         mutex_lock(&bdev->bd_mutex);
 
-        err = bd_claim(bdev, holder);
-        if (err)
-                goto fail;
+        WARN_ON_ONCE(!bdev->bd_holder || bdev->bd_holder_disk);
 
-        found = find_bd_holder(bdev, bo);
-        if (found)
-                goto fail;
+        /* FIXME: remove the following once add_disk() handles errors */
+        if (WARN_ON(!disk->slave_dir || !bdev->bd_part->holder_dir))
+                goto out_unlock;
 
-        err = add_bd_holder(bdev, bo);
-        if (err)
-                bd_release(bdev);
-        else
-                bo = NULL;
-fail:
-        mutex_unlock(&bdev->bd_mutex);
-        free_bd_holder(bo);
-        return err;
-}
+        ret = add_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
+        if (ret)
+                goto out_unlock;
 
-/**
- * bd_release_from_kobject - bd_release() with additional kobject signature
- *
- * @bdev:       block device to be released
- * @kobj:       holder's kobject
- *
- * Do bd_release() and remove sysfs symlinks created by bd_claim_by_kobject().
- */
-static void bd_release_from_kobject(struct block_device *bdev,
-                                        struct kobject *kobj)
-{
-        if (!kobj)
-                return;
+        ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
+        if (ret) {
+                del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
+                goto out_unlock;
+        }
 
-        mutex_lock(&bdev->bd_mutex);
-        bd_release(bdev);
-        free_bd_holder(del_bd_holder(bdev, kobj));
+        bdev->bd_holder_disk = disk;
+out_unlock:
         mutex_unlock(&bdev->bd_mutex);
+        return ret;
 }
+EXPORT_SYMBOL_GPL(bd_link_disk_holder);
 
-/**
- * bd_claim_by_disk - wrapper function for bd_claim_by_kobject()
- *
- * @bdev:       block device to be claimed
- * @holder:     holder's signature
- * @disk:       holder's gendisk
- *
- * Call bd_claim_by_kobject() with getting @disk->slave_dir.
- */
-int bd_claim_by_disk(struct block_device *bdev, void *holder,
-                        struct gendisk *disk)
+static void bd_unlink_disk_holder(struct block_device *bdev)
 {
-        return bd_claim_by_kobject(bdev, holder, kobject_get(disk->slave_dir));
-}
-EXPORT_SYMBOL_GPL(bd_claim_by_disk);
+        struct gendisk *disk = bdev->bd_holder_disk;
 
-/**
- * bd_release_from_disk - wrapper function for bd_release_from_kobject()
- *
- * @bdev:       block device to be claimed
- * @disk:       holder's gendisk
- *
- * Call bd_release_from_kobject() and put @disk->slave_dir.
- */
-void bd_release_from_disk(struct block_device *bdev, struct gendisk *disk)
-{
-        bd_release_from_kobject(bdev, disk->slave_dir);
-        kobject_put(disk->slave_dir);
-}
-EXPORT_SYMBOL_GPL(bd_release_from_disk);
-#endif
+        bdev->bd_holder_disk = NULL;
+        if (!disk)
+                return;
 
-/*
- * Tries to open block device by device number.  Use it ONLY if you
- * really do not have anything better - i.e. when you are behind a
- * truly sucky interface and all you are given is a device number.  _Never_
- * to be used for internal purposes.  If you ever need it - reconsider
- * your API.
- */
-struct block_device *open_by_devnum(dev_t dev, fmode_t mode)
-{
-        struct block_device *bdev = bdget(dev);
-        int err = -ENOMEM;
-        if (bdev)
-                err = blkdev_get(bdev, mode);
-        return err ? ERR_PTR(err) : bdev;
+        del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
+        del_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
 }
-
-EXPORT_SYMBOL(open_by_devnum);
+#else
+static inline void bd_unlink_disk_holder(struct block_device *bdev)
+{ }
+#endif
 
 /**
  * flush_disk - invalidates all buffer-cache entries on a disk
@@ -1469,17 +1114,156 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
         return ret;
 }
 
-int blkdev_get(struct block_device *bdev, fmode_t mode)
+/**
+ * blkdev_get - open a block device
+ * @bdev: block_device to open
+ * @mode: FMODE_* mask
+ * @holder: exclusive holder identifier
+ *
+ * Open @bdev with @mode.  If @mode includes %FMODE_EXCL, @bdev is
+ * open with exclusive access.  Specifying %FMODE_EXCL with %NULL
+ * @holder is invalid.  Exclusive opens may nest for the same @holder.
+ *
+ * On success, the reference count of @bdev is unchanged.  On failure,
+ * @bdev is put.
+ *
+ * CONTEXT:
+ * Might sleep.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
 {
-        return __blkdev_get(bdev, mode, 0);
+        struct block_device *whole = NULL;
+        int res;
+
+        WARN_ON_ONCE((mode & FMODE_EXCL) && !holder);
+
+        if ((mode & FMODE_EXCL) && holder) {
+                whole = bd_start_claiming(bdev, holder);
+                if (IS_ERR(whole)) {
+                        bdput(bdev);
+                        return PTR_ERR(whole);
+                }
+        }
+
+        res = __blkdev_get(bdev, mode, 0);
+
+        /* __blkdev_get() may alter read only status, check it afterwards */
+        if (!res && (mode & FMODE_WRITE) && bdev_read_only(bdev)) {
+                __blkdev_put(bdev, mode, 0);
+                res = -EACCES;
+        }
+
+        if (whole) {
+                /* finish claiming */
+                spin_lock(&bdev_lock);
+
+                if (res == 0) {
+                        BUG_ON(!bd_may_claim(bdev, whole, holder));
+                        /*
+                         * Note that for a whole device bd_holders
+                         * will be incremented twice, and bd_holder
+                         * will be set to bd_may_claim before being
+                         * set to holder
+                         */
+                        whole->bd_holders++;
+                        whole->bd_holder = bd_may_claim;
+                        bdev->bd_holders++;
+                        bdev->bd_holder = holder;
+                }
+
+                /* tell others that we're done */
+                BUG_ON(whole->bd_claiming != holder);
+                whole->bd_claiming = NULL;
+                wake_up_bit(&whole->bd_claiming, 0);
+
+                spin_unlock(&bdev_lock);
+                bdput(whole);
+        }
+
+        return res;
 }
 EXPORT_SYMBOL(blkdev_get);
 
+/**
+ * blkdev_get_by_path - open a block device by name
+ * @path: path to the block device to open
+ * @mode: FMODE_* mask
+ * @holder: exclusive holder identifier
+ *
+ * Open the blockdevice described by the device file at @path.  @mode
+ * and @holder are identical to blkdev_get().
+ *
+ * On success, the returned block_device has reference count of one.
+ *
+ * CONTEXT:
+ * Might sleep.
+ *
+ * RETURNS:
+ * Pointer to block_device on success, ERR_PTR(-errno) on failure.
+ */
+struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
+                                        void *holder)
+{
+        struct block_device *bdev;
+        int err;
+
+        bdev = lookup_bdev(path);
+        if (IS_ERR(bdev))
+                return bdev;
+
+        err = blkdev_get(bdev, mode, holder);
+        if (err)
+                return ERR_PTR(err);
+
+        return bdev;
+}
+EXPORT_SYMBOL(blkdev_get_by_path);
+
+/**
+ * blkdev_get_by_dev - open a block device by device number
+ * @dev: device number of block device to open
+ * @mode: FMODE_* mask
+ * @holder: exclusive holder identifier
+ *
+ * Open the blockdevice described by device number @dev.  @mode and
+ * @holder are identical to blkdev_get().
+ *
+ * Use it ONLY if you really do not have anything better - i.e. when
+ * you are behind a truly sucky interface and all you are given is a
+ * device number.  _Never_ to be used for internal purposes.  If you
+ * ever need it - reconsider your API.
+ *
+ * On success, the returned block_device has reference count of one.
+ *
+ * CONTEXT:
+ * Might sleep.
+ *
+ * RETURNS:
+ * Pointer to block_device on success, ERR_PTR(-errno) on failure.
+ */
+struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder)
+{
+        struct block_device *bdev;
+        int err;
+
+        bdev = bdget(dev);
+        if (!bdev)
+                return ERR_PTR(-ENOMEM);
+
+        err = blkdev_get(bdev, mode, holder);
+        if (err)
+                return ERR_PTR(err);
+
+        return bdev;
+}
+EXPORT_SYMBOL(blkdev_get_by_dev);
+
 static int blkdev_open(struct inode * inode, struct file * filp)
 {
-        struct block_device *whole = NULL;
         struct block_device *bdev;
-        int res;
 
         /*
          * Preserve backwards compatibility and allow large file access
@@ -1500,26 +1284,9 @@ static int blkdev_open(struct inode * inode, struct file * filp)
         if (bdev == NULL)
                 return -ENOMEM;
 
-        if (filp->f_mode & FMODE_EXCL) {
-                whole = bd_start_claiming(bdev, filp);
-                if (IS_ERR(whole)) {
-                        bdput(bdev);
-                        return PTR_ERR(whole);
-                }
-        }
-
         filp->f_mapping = bdev->bd_inode->i_mapping;
 
-        res = blkdev_get(bdev, filp->f_mode);
-
-        if (whole) {
-                if (res == 0)
-                        bd_finish_claiming(bdev, whole, filp);
-                else
-                        bd_abort_claiming(whole, filp);
-        }
-
-        return res;
+        return blkdev_get(bdev, filp->f_mode, filp);
 }
 
 static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
@@ -1533,6 +1300,7 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
                 bdev->bd_part_count--;
 
         if (!--bdev->bd_openers) {
+                WARN_ON_ONCE(bdev->bd_holders);
                 sync_blockdev(bdev);
                 kill_bdev(bdev);
         }
@@ -1563,6 +1331,34 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
 
 int blkdev_put(struct block_device *bdev, fmode_t mode)
 {
+        if (mode & FMODE_EXCL) {
+                bool bdev_free;
+
+                /*
+                 * Release a claim on the device.  The holder fields
+                 * are protected with bdev_lock.  bd_mutex is to
+                 * synchronize disk_holder unlinking.
+                 */
+                mutex_lock(&bdev->bd_mutex);
+                spin_lock(&bdev_lock);
+
+                WARN_ON_ONCE(--bdev->bd_holders < 0);
+                WARN_ON_ONCE(--bdev->bd_contains->bd_holders < 0);
+
+                /* bd_contains might point to self, check in a separate step */
+                if ((bdev_free = !bdev->bd_holders))
+                        bdev->bd_holder = NULL;
+                if (!bdev->bd_contains->bd_holders)
+                        bdev->bd_contains->bd_holder = NULL;
+
+                spin_unlock(&bdev_lock);
+
+                /* if this was the last claim, holder link should go too */
+                if (bdev_free)
+                        bd_unlink_disk_holder(bdev);
+
+                mutex_unlock(&bdev->bd_mutex);
+        }
         return __blkdev_put(bdev, mode, 0);
 }
 EXPORT_SYMBOL(blkdev_put);
@@ -1570,8 +1366,7 @@ EXPORT_SYMBOL(blkdev_put);
 static int blkdev_close(struct inode * inode, struct file * filp)
 {
         struct block_device *bdev = I_BDEV(filp->f_mapping->host);
-        if (bdev->bd_holder == filp)
-                bd_release(bdev);
+
         return blkdev_put(bdev, filp->f_mode);
 }
 
@@ -1716,67 +1511,6 @@ fail:
 }
 EXPORT_SYMBOL(lookup_bdev);
 
-/**
- * open_bdev_exclusive  -  open a block device by name and set it up for use
- *
- * @path:       special file representing the block device
- * @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_exclusive(const char *path, fmode_t mode, void *holder)
-{
-        struct block_device *bdev, *whole;
-        int error;
-
-        bdev = lookup_bdev(path);
-        if (IS_ERR(bdev))
-                return bdev;
-
-        whole = bd_start_claiming(bdev, holder);
-        if (IS_ERR(whole)) {
-                bdput(bdev);
-                return whole;
-        }
-
-        error = blkdev_get(bdev, mode);
-        if (error)
-                goto out_abort_claiming;
-
-        error = -EACCES;
-        if ((mode & FMODE_WRITE) && bdev_read_only(bdev))
-                goto out_blkdev_put;
-
-        bd_finish_claiming(bdev, whole, holder);
-        return bdev;
-
-out_blkdev_put:
-        blkdev_put(bdev, mode);
-out_abort_claiming:
-        bd_abort_claiming(whole, holder);
-        return ERR_PTR(error);
-}
-
-EXPORT_SYMBOL(open_bdev_exclusive);
-
-/**
- * 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_exclusive().
- */
-void close_bdev_exclusive(struct block_device *bdev, fmode_t mode)
-{
-        bd_release(bdev);
-        blkdev_put(bdev, mode);
-}
-
-EXPORT_SYMBOL(close_bdev_exclusive);
-
 int __invalidate_device(struct block_device *bdev)
 {
         struct super_block *sb = get_super(bdev);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index cc04dc1445d6..95324e9f9280 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -489,7 +489,7 @@ again:
                         continue;
 
                 if (device->bdev) {
-                        close_bdev_exclusive(device->bdev, device->mode);
+                        blkdev_put(device->bdev, device->mode);
                         device->bdev = NULL;
                         fs_devices->open_devices--;
                 }
@@ -523,7 +523,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 
         list_for_each_entry(device, &fs_devices->devices, dev_list) {
                 if (device->bdev) {
-                        close_bdev_exclusive(device->bdev, device->mode);
+                        blkdev_put(device->bdev, device->mode);
                         fs_devices->open_devices--;
                 }
                 if (device->writeable) {
@@ -580,13 +580,15 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
         int seeding = 1;
         int ret = 0;
 
+        flags |= FMODE_EXCL;
+
         list_for_each_entry(device, head, dev_list) {
                 if (device->bdev)
                         continue;
                 if (!device->name)
                         continue;
 
-                bdev = open_bdev_exclusive(device->name, flags, holder);
+                bdev = blkdev_get_by_path(device->name, flags, holder);
                 if (IS_ERR(bdev)) {
                         printk(KERN_INFO "open %s failed\n", device->name);
                         goto error;
@@ -638,7 +640,7 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 error_brelse:
                 brelse(bh);
 error_close:
-                close_bdev_exclusive(bdev, FMODE_READ);
+                blkdev_put(bdev, flags);
 error:
                 continue;
         }
@@ -684,7 +686,8 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 
         mutex_lock(&uuid_mutex);
 
-        bdev = open_bdev_exclusive(path, flags, holder);
+        flags |= FMODE_EXCL;
+        bdev = blkdev_get_by_path(path, flags, holder);
 
         if (IS_ERR(bdev)) {
                 ret = PTR_ERR(bdev);
@@ -716,7 +719,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 
         brelse(bh);
 error_close:
-        close_bdev_exclusive(bdev, flags);
+        blkdev_put(bdev, flags);
 error:
         mutex_unlock(&uuid_mutex);
         return ret;
@@ -1179,8 +1182,8 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
                         goto out;
                 }
         } else {
-                bdev = open_bdev_exclusive(device_path, FMODE_READ,
-                                      root->fs_info->bdev_holder);
+                bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL,
+                                          root->fs_info->bdev_holder);
                 if (IS_ERR(bdev)) {
                         ret = PTR_ERR(bdev);
                         goto out;
@@ -1244,7 +1247,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
                 root->fs_info->fs_devices->latest_bdev = next_device->bdev;
 
         if (device->bdev) {
-                close_bdev_exclusive(device->bdev, device->mode);
+                blkdev_put(device->bdev, device->mode);
                 device->bdev = NULL;
                 device->fs_devices->open_devices--;
         }
@@ -1287,7 +1290,7 @@ error_brelse:
         brelse(bh);
 error_close:
         if (bdev)
-                close_bdev_exclusive(bdev, FMODE_READ);
+                blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
 out:
         mutex_unlock(&root->fs_info->volume_mutex);
         mutex_unlock(&uuid_mutex);
@@ -1439,7 +1442,8 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
         if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding)
                 return -EINVAL;
 
-        bdev = open_bdev_exclusive(device_path, 0, root->fs_info->bdev_holder);
+        bdev = blkdev_get_by_path(device_path, FMODE_EXCL,
+                                  root->fs_info->bdev_holder);
         if (IS_ERR(bdev))
                 return PTR_ERR(bdev);
 
@@ -1565,7 +1569,7 @@ out:
         mutex_unlock(&root->fs_info->volume_mutex);
         return ret;
 error:
-        close_bdev_exclusive(bdev, 0);
+        blkdev_put(bdev, FMODE_EXCL);
         if (seeding_dev) {
                 mutex_unlock(&uuid_mutex);
                 up_write(&sb->s_umount);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 2b638b6e4eea..856e75770304 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -49,7 +49,7 @@ struct btrfs_device {
 
         struct block_device *bdev;
 
-        /* the mode sent to open_bdev_exclusive */
+        /* the mode sent to blkdev_get */
         fmode_t mode;
 
         char *name;
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 2fedaf8b5012..123720ba786d 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -347,7 +347,7 @@ static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
         struct block_device *bdev;
         char b[BDEVNAME_SIZE];
 
-        bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
+        bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
         if (IS_ERR(bdev))
                 goto fail;
         return bdev;
@@ -364,8 +364,7 @@ fail:
  */
 static int ext3_blkdev_put(struct block_device *bdev)
 {
-        bd_release(bdev);
-        return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
+        return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 }
 
 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
@@ -2136,13 +2135,6 @@ static journal_t *ext3_get_dev_journal(struct super_block *sb,
         if (bdev == NULL)
                 return NULL;
 
-        if (bd_claim(bdev, sb)) {
-                ext3_msg(sb, KERN_ERR,
-                        "error: failed to claim external journal device");
-                blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
-                return NULL;
-        }
-
         blocksize = sb->s_blocksize;
         hblock = bdev_logical_block_size(bdev);
         if (blocksize < hblock) {
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 61182fe6254e..bd63e6927219 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -647,7 +647,7 @@ static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
         struct block_device *bdev;
         char b[BDEVNAME_SIZE];
 
-        bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
+        bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
         if (IS_ERR(bdev))
                 goto fail;
         return bdev;
@@ -663,8 +663,7 @@ fail:
  */
 static int ext4_blkdev_put(struct block_device *bdev)
 {
-        bd_release(bdev);
-        return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
+        return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 }
 
 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
@@ -3758,13 +3757,6 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
         if (bdev == NULL)
                 return NULL;
 
-        if (bd_claim(bdev, sb)) {
-                ext4_msg(sb, KERN_ERR,
-                        "failed to claim external journal device");
-                blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
-                return NULL;
-        }
-
         blocksize = sb->s_blocksize;
         hblock = bdev_logical_block_size(bdev);
         if (blocksize < hblock) {
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 3eb1393f7b81..bc56ccf98ffd 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1268,7 +1268,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
 {
         struct block_device *bdev;
         struct super_block *s;
-        fmode_t mode = FMODE_READ;
+        fmode_t mode = FMODE_READ | FMODE_EXCL;
         int error;
         struct gfs2_args args;
         struct gfs2_sbd *sdp;
@@ -1276,7 +1276,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
         if (!(flags & MS_RDONLY))
                 mode |= FMODE_WRITE;
 
-        bdev = open_bdev_exclusive(dev_name, mode, fs_type);
+        bdev = blkdev_get_by_path(dev_name, mode, fs_type);
         if (IS_ERR(bdev))
                 return ERR_CAST(bdev);
 
@@ -1298,7 +1298,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
                 goto error_bdev;
 
         if (s->s_root)
-                close_bdev_exclusive(bdev, mode);
+                blkdev_put(bdev, mode);
 
         memset(&args, 0, sizeof(args));
         args.ar_quota = GFS2_QUOTA_DEFAULT;
@@ -1342,7 +1342,7 @@ error_super:
         deactivate_locked_super(s);
         return ERR_PTR(error);
 error_bdev:
-        close_bdev_exclusive(bdev, mode);
+        blkdev_put(bdev, mode);
         return ERR_PTR(error);
 }
 
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index e1b8493b9aaa..278e3fb40b71 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -1120,16 +1120,13 @@ int lmLogOpen(struct super_block *sb)
          * file systems to log may have n-to-1 relationship;
          */
 
-        bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE);
+        bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+                                 log);
         if (IS_ERR(bdev)) {
                 rc = -PTR_ERR(bdev);
                 goto free;
         }
 
-        if ((rc = bd_claim(bdev, log))) {
-                goto close;
-        }
-
         log->bdev = bdev;
         memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
 
@@ -1137,7 +1134,7 @@ int lmLogOpen(struct super_block *sb)
          * initialize log:
          */
         if ((rc = lmLogInit(log)))
-                goto unclaim;
+                goto close;
 
         list_add(&log->journal_list, &jfs_external_logs);
 
@@ -1163,11 +1160,8 @@ journal_found:
         list_del(&log->journal_list);
         lbmLogShutdown(log);
 
-      unclaim:
-        bd_release(bdev);
-
       close:            /* close external log device */
-        blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
+        blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 
       free:             /* free log descriptor */
         mutex_unlock(&jfs_log_mutex);
@@ -1512,8 +1506,7 @@ int lmLogClose(struct super_block *sb)
         bdev = log->bdev;
         rc = lmLogShutdown(log);
 
-        bd_release(bdev);
-        blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
+        blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 
         kfree(log);
 
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 92ca6fbe09bd..723bc5bca09a 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -300,7 +300,7 @@ static int bdev_write_sb(struct super_block *sb, struct page *page)
 
 static void bdev_put_device(struct logfs_super *s)
 {
-        close_bdev_exclusive(s->s_bdev, FMODE_READ|FMODE_WRITE);
+        blkdev_put(s->s_bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 }
 
 static int bdev_can_write_buf(struct super_block *sb, u64 ofs)
@@ -325,13 +325,14 @@ int logfs_get_sb_bdev(struct logfs_super *p, struct file_system_type *type,
 {
         struct block_device *bdev;
 
-        bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, type);
+        bdev = blkdev_get_by_path(devname, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+                                  type);
         if (IS_ERR(bdev))
                 return PTR_ERR(bdev);
 
         if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
                 int mtdnr = MINOR(bdev->bd_dev);
-                close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
+                blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
                 return logfs_get_sb_mtd(p, mtdnr);
         }
 
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index f804d41ec9d3..0030640e2d72 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -1147,14 +1147,14 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
 {
         struct nilfs_super_data sd;
         struct super_block *s;
-        fmode_t mode = FMODE_READ;
+        fmode_t mode = FMODE_READ | FMODE_EXCL;
         struct dentry *root_dentry;
         int err, s_new = false;
 
         if (!(flags & MS_RDONLY))
                 mode |= FMODE_WRITE;
 
-        sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
+        sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
         if (IS_ERR(sd.bdev))
                 return ERR_CAST(sd.bdev);
 
@@ -1233,7 +1233,7 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
         }
 
         if (!s_new)
-                close_bdev_exclusive(sd.bdev, mode);
+                blkdev_put(sd.bdev, mode);
 
         return root_dentry;
 
@@ -1242,7 +1242,7 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
 
  failed:
         if (!s_new)
-                close_bdev_exclusive(sd.bdev, mode);
+                blkdev_put(sd.bdev, mode);
         return ERR_PTR(err);
 }
 
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 52c7557f3e25..d0a2721eaceb 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1674,7 +1674,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
                 goto out;
 
         reg->hr_bdev = I_BDEV(filp->f_mapping->host);
-        ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ);
+        ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL);
         if (ret) {
                 reg->hr_bdev = NULL;
                 goto out;
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 12213f7ce7a2..bdf8d3cc95a4 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -558,7 +558,7 @@ void register_disk(struct gendisk *disk)
                 goto exit;
 
         bdev->bd_invalidated = 1;
-        err = blkdev_get(bdev, FMODE_READ);
+        err = blkdev_get(bdev, FMODE_READ, NULL);
         if (err < 0)
                 goto exit;
         blkdev_put(bdev, FMODE_READ);
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 076c8b194682..e2fce519c0f2 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -2552,8 +2552,6 @@ static int release_journal_dev(struct super_block *super,
         result = 0;
 
         if (journal->j_dev_bd != NULL) {
-                if (journal->j_dev_bd->bd_dev != super->s_dev)
-                        bd_release(journal->j_dev_bd);
                 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
                 journal->j_dev_bd = NULL;
         }
@@ -2571,7 +2569,7 @@ static int journal_init_dev(struct super_block *super,
 {
         int result;
         dev_t jdev;
-        fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE;
+        fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
         char b[BDEVNAME_SIZE];
 
         result = 0;
@@ -2585,7 +2583,10 @@ static int journal_init_dev(struct super_block *super,
 
         /* there is no "jdev" option and journal is on separate device */
         if ((!jdev_name || !jdev_name[0])) {
-                journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
+                if (jdev == super->s_dev)
+                        blkdev_mode &= ~FMODE_EXCL;
+                journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
+                                                      journal);
                 journal->j_dev_mode = blkdev_mode;
                 if (IS_ERR(journal->j_dev_bd)) {
                         result = PTR_ERR(journal->j_dev_bd);
@@ -2594,22 +2595,14 @@ static int journal_init_dev(struct super_block *super,
                                          "cannot init journal device '%s': %i",
                                          __bdevname(jdev, b), result);
                         return result;
-                } else if (jdev != super->s_dev) {
-                        result = bd_claim(journal->j_dev_bd, journal);
-                        if (result) {
-                                blkdev_put(journal->j_dev_bd, blkdev_mode);
-                                return result;
-                        }
-
+                } else if (jdev != super->s_dev)
                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
-                }
 
                 return 0;
         }
 
         journal->j_dev_mode = blkdev_mode;
-        journal->j_dev_bd = open_bdev_exclusive(jdev_name,
-                                                blkdev_mode, journal);
+        journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
         if (IS_ERR(journal->j_dev_bd)) {
                 result = PTR_ERR(journal->j_dev_bd);
                 journal->j_dev_bd = NULL;
diff --git a/fs/super.c b/fs/super.c
index ca696155cd9a..5d9a4497849a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -766,13 +766,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 {
         struct block_device *bdev;
         struct super_block *s;
-        fmode_t mode = FMODE_READ;
+        fmode_t mode = FMODE_READ | FMODE_EXCL;
         int error = 0;
 
         if (!(flags & MS_RDONLY))
                 mode |= FMODE_WRITE;
 
-        bdev = open_bdev_exclusive(dev_name, mode, fs_type);
+        bdev = blkdev_get_by_path(dev_name, mode, fs_type);
         if (IS_ERR(bdev))
                 return ERR_CAST(bdev);
 
@@ -801,13 +801,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 
                 /*
                  * s_umount nests inside bd_mutex during
-                 * __invalidate_device().  close_bdev_exclusive()
-                 * acquires bd_mutex and can't be called under
-                 * s_umount.  Drop s_umount temporarily.  This is safe
-                 * as we're holding an active reference.
+                 * __invalidate_device().  blkdev_put() acquires
+                 * bd_mutex and can't be called under s_umount.  Drop
+                 * s_umount temporarily.  This is safe as we're
+                 * holding an active reference.
                  */
                 up_write(&s->s_umount);
-                close_bdev_exclusive(bdev, mode);
+                blkdev_put(bdev, mode);
                 down_write(&s->s_umount);
         } else {
                 char b[BDEVNAME_SIZE];
@@ -831,7 +831,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 error_s:
         error = PTR_ERR(s);
 error_bdev:
-        close_bdev_exclusive(bdev, mode);
+        blkdev_put(bdev, mode);
 error:
         return ERR_PTR(error);
 }
@@ -862,7 +862,8 @@ void kill_block_super(struct super_block *sb)
         bdev->bd_super = NULL;
         generic_shutdown_super(sb);
         sync_blockdev(bdev);
-        close_bdev_exclusive(bdev, mode);
+        WARN_ON_ONCE(!(mode & FMODE_EXCL));
+        blkdev_put(bdev, mode | FMODE_EXCL);
 }
 
 EXPORT_SYMBOL(kill_block_super);
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 064f964d4f3c..2d2ce7f651a7 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -606,7 +606,8 @@ xfs_blkdev_get(
 {
         int                     error = 0;
 
-        *bdevp = open_bdev_exclusive(name, FMODE_READ|FMODE_WRITE, mp);
+        *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+                                    mp);
         if (IS_ERR(*bdevp)) {
                 error = PTR_ERR(*bdevp);
                 printk("XFS: Invalid device [%s], error=%d\n", name, error);
@@ -620,7 +621,7 @@ xfs_blkdev_put(
         struct block_device     *bdev)
 {
         if (bdev)
-                close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
+                blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 }
 
 /*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 334d68a17108..f48501563917 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -663,7 +663,7 @@ struct block_device {
         void *                  bd_holder;
         int                     bd_holders;
 #ifdef CONFIG_SYSFS
-        struct list_head        bd_holder_list;
+        struct gendisk *        bd_holder_disk; /* for sysfs slave linkng */
 #endif
         struct block_device *   bd_contains;
         unsigned                bd_block_size;
@@ -2006,7 +2006,6 @@ extern struct block_device *bdgrab(struct block_device *bdev);
 extern void bd_set_size(struct block_device *, loff_t size);
 extern void bd_forget(struct inode *inode);
 extern void bdput(struct block_device *);
-extern struct block_device *open_by_devnum(dev_t, fmode_t);
 extern void invalidate_bdev(struct block_device *);
 extern int sync_blockdev(struct block_device *bdev);
 extern struct super_block *freeze_bdev(struct block_device *);
@@ -2037,16 +2036,20 @@ extern const struct file_operations def_fifo_fops;
 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
-extern int blkdev_get(struct block_device *, fmode_t);
-extern int blkdev_put(struct block_device *, fmode_t);
-extern int bd_claim(struct block_device *, void *);
-extern void bd_release(struct block_device *);
+extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
+extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
+                                               void *holder);
+extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
+                                              void *holder);
+extern int blkdev_put(struct block_device *bdev, fmode_t mode);
 #ifdef CONFIG_SYSFS
-extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
-extern void bd_release_from_disk(struct block_device *, struct gendisk *);
+extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
 #else
-#define bd_claim_by_disk(bdev, holder, disk)    bd_claim(bdev, holder)
-#define bd_release_from_disk(bdev, disk)        bd_release(bdev)
+static inline int bd_link_disk_holder(struct block_device *bdev,
+                                      struct gendisk *disk)
+{
+        return 0;
+}
 #endif
 #endif
 
@@ -2082,8 +2085,6 @@ static inline void unregister_chrdev(unsigned int major, const char *name)
 extern const char *__bdevname(dev_t, char *buffer);
 extern const char *bdevname(struct block_device *bdev, char *buffer);
 extern struct block_device *lookup_bdev(const char *);
-extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
-extern void close_bdev_exclusive(struct block_device *, fmode_t);
 extern void blkdev_show(struct seq_file *,off_t);
 
 #else
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index a0e4a86ccf94..b019609d1b45 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -223,7 +223,7 @@ static int swsusp_swap_check(void)
                 return res;
 
         root_swap = res;
-        res = blkdev_get(hib_resume_bdev, FMODE_WRITE);
+        res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL);
         if (res)
                 return res;
 
@@ -907,7 +907,8 @@ int swsusp_check(void)
 {
         int error;
 
-        hib_resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
+        hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device,
+                                            FMODE_READ, NULL);
         if (!IS_ERR(hib_resume_bdev)) {
                 set_blocksize(hib_resume_bdev, PAGE_SIZE);
                 clear_page(swsusp_header);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 67ddaaf98c74..b6adcfbf6f48 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1677,7 +1677,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
         if (S_ISBLK(inode->i_mode)) {
                 struct block_device *bdev = I_BDEV(inode);
                 set_blocksize(bdev, p->old_block_size);
-                bd_release(bdev);
+                blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
         } else {
                 mutex_lock(&inode->i_mutex);
                 inode->i_flags &= ~S_SWAPFILE;
@@ -1939,7 +1939,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
         error = -EINVAL;
         if (S_ISBLK(inode->i_mode)) {
                 bdev = I_BDEV(inode);
-                error = bd_claim(bdev, sys_swapon);
+                error = blkdev_get(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL,
+                                   sys_swapon);
                 if (error < 0) {
                         bdev = NULL;
                         error = -EINVAL;
@@ -2136,7 +2137,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 bad_swap:
         if (bdev) {
                 set_blocksize(bdev, p->old_block_size);
-                bd_release(bdev);
+                blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
         }
         destroy_swap_extents(p);
         swap_cgroup_swapoff(type);