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Message-Id: <1448448851-10343-31-git-send-email-philipp.reisner@linbit.com>
Date: Wed, 25 Nov 2015 11:54:03 +0100
From: Philipp Reisner <philipp.reisner@...bit.com>
To: Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc: drbd-dev@...ts.linbit.com
Subject: [PATCH 30/38] drbd: make drbd known to lsblk: use bd_link_disk_holder
From: Lars Ellenberg <lars.ellenberg@...bit.com>
lsblk should be able to pick up stacking device driver relations
involving DRBD conveniently.
Even though upstream kernel since 2011 says
"DON'T USE THIS UNLESS YOU'RE ALREADY USING IT."
a new user has been added since (bcache),
which sets the precedences for us to use it as well.
Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com>
---
drivers/block/drbd/drbd_int.h | 2 +-
drivers/block/drbd/drbd_main.c | 16 +-----
drivers/block/drbd/drbd_nl.c | 121 ++++++++++++++++++++++++++++-----------
drivers/block/drbd/drbd_worker.c | 2 +-
include/linux/drbd.h | 2 +-
5 files changed, 91 insertions(+), 52 deletions(-)
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 08f266e..a262653 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1126,7 +1126,7 @@ extern int drbd_send_ov_request(struct drbd_peer_device *, sector_t sector, int
extern int drbd_send_bitmap(struct drbd_device *device);
extern void drbd_send_sr_reply(struct drbd_peer_device *, enum drbd_state_rv retcode);
extern void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode);
-extern void drbd_free_ldev(struct drbd_backing_dev *ldev);
+extern void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev);
extern void drbd_device_cleanup(struct drbd_device *device);
void drbd_print_uuids(struct drbd_device *device, const char *text);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index a4aa7eb..136fa73 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1992,7 +1992,7 @@ void drbd_device_cleanup(struct drbd_device *device)
drbd_bm_cleanup(device);
}
- drbd_free_ldev(device->ldev);
+ drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
clear_bit(AL_SUSPENDED, &device->flags);
@@ -2171,7 +2171,7 @@ void drbd_destroy_device(struct kref *kref)
if (device->this_bdev)
bdput(device->this_bdev);
- drbd_free_ldev(device->ldev);
+ drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
drbd_release_all_peer_reqs(device);
@@ -2964,18 +2964,6 @@ fail:
return err;
}
-void drbd_free_ldev(struct drbd_backing_dev *ldev)
-{
- if (ldev == NULL)
- return;
-
- blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
- blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
-
- kfree(ldev->disk_conf);
- kfree(ldev);
-}
-
static void drbd_free_one_sock(struct drbd_socket *ds)
{
struct socket *s;
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 4703f1a..ee34739 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1471,6 +1471,88 @@ success:
return 0;
}
+static struct block_device *open_backing_dev(struct drbd_device *device,
+ const char *bdev_path, void *claim_ptr, bool do_bd_link)
+{
+ struct block_device *bdev;
+ int err = 0;
+
+ bdev = blkdev_get_by_path(bdev_path,
+ FMODE_READ | FMODE_WRITE | FMODE_EXCL, claim_ptr);
+ if (IS_ERR(bdev)) {
+ drbd_err(device, "open(\"%s\") failed with %ld\n",
+ bdev_path, PTR_ERR(bdev));
+ return bdev;
+ }
+
+ if (!do_bd_link)
+ return bdev;
+
+ err = bd_link_disk_holder(bdev, device->vdisk);
+ if (err) {
+ blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+ drbd_err(device, "bd_link_disk_holder(\"%s\", ...) failed with %d\n",
+ bdev_path, err);
+ bdev = ERR_PTR(err);
+ }
+ return bdev;
+}
+
+static int open_backing_devices(struct drbd_device *device,
+ struct disk_conf *new_disk_conf,
+ struct drbd_backing_dev *nbc)
+{
+ struct block_device *bdev;
+
+ bdev = open_backing_dev(device, new_disk_conf->backing_dev, device, true);
+ if (IS_ERR(bdev))
+ return ERR_OPEN_DISK;
+ nbc->backing_bdev = bdev;
+
+ /*
+ * 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 = open_backing_dev(device, new_disk_conf->meta_dev,
+ /* claim ptr: device, if claimed exclusively; shared drbd_m_holder,
+ * if potentially shared with other drbd minors */
+ (new_disk_conf->meta_dev_idx < 0) ? (void*)device : (void*)drbd_m_holder,
+ /* avoid double bd_claim_by_disk() for the same (source,target) tuple,
+ * as would happen with internal metadata. */
+ (new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_FLEX_INT &&
+ new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_INTERNAL));
+ if (IS_ERR(bdev))
+ return ERR_OPEN_MD_DISK;
+ nbc->md_bdev = bdev;
+ return NO_ERROR;
+}
+
+static void close_backing_dev(struct drbd_device *device, struct block_device *bdev,
+ bool do_bd_unlink)
+{
+ if (!bdev)
+ return;
+ if (do_bd_unlink)
+ bd_unlink_disk_holder(bdev, device->vdisk);
+ blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+}
+
+void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev)
+{
+ if (ldev == NULL)
+ return;
+
+ close_backing_dev(device, ldev->md_bdev, ldev->md_bdev != ldev->backing_bdev);
+ close_backing_dev(device, ldev->backing_bdev, true);
+
+ kfree(ldev->disk_conf);
+ kfree(ldev);
+}
+
int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
@@ -1484,7 +1566,6 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
sector_t min_md_device_sectors;
struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
struct disk_conf *new_disk_conf = NULL;
- struct block_device *bdev;
struct lru_cache *resync_lru = NULL;
struct fifo_buffer *new_plan = NULL;
union drbd_state ns, os;
@@ -1572,35 +1653,9 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
}
rcu_read_unlock();
- bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
- FMODE_READ | FMODE_WRITE | FMODE_EXCL, device);
- if (IS_ERR(bdev)) {
- drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
- PTR_ERR(bdev));
- retcode = ERR_OPEN_DISK;
- goto fail;
- }
- nbc->backing_bdev = bdev;
-
- /*
- * 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(new_disk_conf->meta_dev,
- FMODE_READ | FMODE_WRITE | FMODE_EXCL,
- (new_disk_conf->meta_dev_idx < 0) ?
- (void *)device : (void *)drbd_m_holder);
- if (IS_ERR(bdev)) {
- drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
- PTR_ERR(bdev));
- retcode = ERR_OPEN_MD_DISK;
+ retcode = open_backing_devices(device, new_disk_conf, nbc);
+ if (retcode != NO_ERROR)
goto fail;
- }
- nbc->md_bdev = bdev;
if ((nbc->backing_bdev == nbc->md_bdev) !=
(new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
@@ -1900,12 +1955,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
fail:
conn_reconfig_done(connection);
if (nbc) {
- 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);
+ close_backing_dev(device, nbc->md_bdev, nbc->md_bdev != nbc->backing_bdev);
+ close_backing_dev(device, nbc->backing_bdev, true);
kfree(nbc);
}
kfree(new_disk_conf);
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 2f29bf3..eff716c 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1841,7 +1841,7 @@ static void drbd_ldev_destroy(struct drbd_device *device)
device->act_log = NULL;
__acquire(local);
- drbd_free_ldev(device->ldev);
+ drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
__release(local);
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 392fc0e..d6b3c99 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -51,7 +51,7 @@
#endif
extern const char *drbd_buildtag(void);
-#define REL_VERSION "8.4.5"
+#define REL_VERSION "8.4.6"
#define API_VERSION 1
#define PRO_VERSION_MIN 86
#define PRO_VERSION_MAX 101
--
1.9.1
--
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