File 0025-compat-drdb-Convert-to-use-bdev_open_by_pa... of Package drbd

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File 0025-compat-drdb-Convert-to-use-bdev_open_by_path.patch of Package drbd (Revision 9b15dc401a5ac4b247d86cd8bd6be1ab)

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From 604f31ab14eeca9eddb42028de93bb89f3ae6515 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20B=C3=B6hmwalder?=
 <christoph.boehmwalder@linbit.com>
Date: Thu, 4 Apr 2024 16:27:51 +0200
Subject: [PATCH 2/3] compat: drdb: Convert to use bdev_open_by_path()

Equivalent to upstream Linux commit 75e27d373425
("drdb [sic]: Convert to use bdev_open_by_path()"), plus a compat patch.
---
 .../cocci/bdev_open_by_path__no_present.cocci | 173 ++++++++++++++++++
 drbd/drbd-kernel-compat/gen_patch_names.c     |   3 +
 .../tests/have_bdev_open_by_path.c            |   8 +
 drbd/drbd_int.h                               |   2 +
 drbd/drbd_nl.c                                |  59 +++---
 5 files changed, 216 insertions(+), 29 deletions(-)
 create mode 100644 drbd/drbd-kernel-compat/cocci/bdev_open_by_path__no_present.cocci
 create mode 100644 drbd/drbd-kernel-compat/tests/have_bdev_open_by_path.c

diff --git a/drbd/drbd-kernel-compat/cocci/bdev_open_by_path__no_present.cocci b/drbd/drbd-kernel-compat/cocci/bdev_open_by_path__no_present.cocci
new file mode 100644
index 000000000000..983f05080f79
--- /dev/null
+++ b/drbd/drbd-kernel-compat/cocci/bdev_open_by_path__no_present.cocci
@@ -0,0 +1,173 @@
+@@
+@@
+struct drbd_backing_dev {
+...
+- struct bdev_handle *backing_bdev_handle;
+...
+- struct bdev_handle *md_bdev_handle;
+...
+}
+
+@@
+identifier handle;
+@@
+static void close_backing_dev(...,
+-	struct bdev_handle *handle
++	struct block_device *bdev, void *holder
+	, ...
+ )
+{
+<...
+(
+- handle->bdev
++ bdev
+|
+- bdev_release(handle)
++ blkdev_put(bdev, holder)
+|
+- handle
++ bdev
+)
+...>
+} 
+
+@@
+identifier device;
+struct bdev_handle *handle;
+identifier err;
+identifier new_disk_conf;
+@@
+// special case: when linking the meta_dev, we want to pass meta_claim_ptr to close instead of device
+err = link_backing_dev(..., new_disk_conf->meta_dev, ...);
+if (err) {
+	...
+	close_backing_dev(device,
+-		handle
++		bdev, meta_claim_ptr
+	, ...);
+	...
+}
+
+@@
+identifier ldev;
+struct bdev_handle *handle;
+identifier device;
+@@
+// generic close_backing_dev usage
+close_backing_dev(device,
+(
+- ldev->backing_bdev_handle
++ ldev->backing_bdev, device
+|
+- ldev->md_bdev_handle
++ ldev->md_bdev,
++ ldev->md.meta_dev_idx < 0 ? (void *)device : (void *)drbd_m_holder
+|
+- handle
++ bdev, device
+)
+, ...);
+
+@@
+identifier handle;
+@@
+- struct bdev_handle *
++ struct block_device *
+open_backing_dev(...)
+{
+...
+- struct bdev_handle *handle = bdev_open_by_path(
++ struct block_device *bdev = blkdev_get_by_path(
+...);
+<...
+(
+IS_ERR
+|
+PTR_ERR
+)
+ (
+- handle
++ bdev
+ )
+...>
+return
+- handle
++ bdev
+;
+}
+
+@@
+identifier handle;
+identifier err;
+@@
+static int link_backing_dev(...,
+-	struct bdev_handle *handle
++	struct block_device *bdev
+ )
+{
+...
+int err = bd_link_disk_holder(
+-	handle->bdev
++	bdev
+	, ...);
+if (err) {
+-	bdev_release(handle);
+	...
+}
+...
+}
+
+@@
+identifier device;
+expression bd;
+identifier handle;
+@@
+// generic link_backing_dev usage
+link_backing_dev(device, bd,
+-	handle
++	bdev
+ )
+
+@@
+identifier handle;
+@@
+// generic open_backing_dev usage
+{
+...
+- struct bdev_handle *handle;
++ struct block_device *bdev;
+<...
+(
+- handle
++ bdev
+= open_backing_dev(...);
+|
+IS_ERR(
+- handle
++ bdev
+ )
+)
+...>
+}
+
+@@
+struct drbd_backing_dev *nbc;
+identifier handle;
+@@
+(
+- nbc->backing_bdev = handle->bdev;
+- nbc->backing_bdev_handle = handle;
++ nbc->backing_bdev = bdev;
+|
+- nbc->md_bdev = handle->bdev;
+- nbc->md_bdev_handle = handle;
++ nbc->md_bdev = bdev;
+)
+
+@@
+identifier handle;
+identifier nbc;
+@@
+// only this one comparison exists in the code, just special-case it instead of implementing the generic case
+- handle != nbc->backing_bdev_handle
++ bdev != nbc->backing_bdev
diff --git a/drbd/drbd-kernel-compat/gen_patch_names.c b/drbd/drbd-kernel-compat/gen_patch_names.c
index 86a7ce7a93ed..d6fe75a80cf6 100644
--- a/drbd/drbd-kernel-compat/gen_patch_names.c
+++ b/drbd/drbd-kernel-compat/gen_patch_names.c
@@ -559,6 +559,9 @@ int main(int argc, char **argv)
 	patch(1, "__bio_add_page", true, false,
 	      COMPAT_HAVE___BIO_ADD_PAGE, "present");
 
+	patch(1, "bdev_open_by_path", true, false,
+	      COMPAT_HAVE_BDEV_OPEN_BY_PATH, "present");
+
 	patch(1, "blkdev_get_by_path", true, false,
 	      COMPAT_BLKDEV_GET_BY_PATH_HAS_HOLDER_OPS, "has_holder_ops");
 
diff --git a/drbd/drbd-kernel-compat/tests/have_bdev_open_by_path.c b/drbd/drbd-kernel-compat/tests/have_bdev_open_by_path.c
new file mode 100644
index 000000000000..92266de0b15b
--- /dev/null
+++ b/drbd/drbd-kernel-compat/tests/have_bdev_open_by_path.c
@@ -0,0 +1,8 @@
+/* { "version": "v6.7", "commit": "e719b4d156749f02eafed31a3c515f2aa9dcc72a", "comment": "introduce bdev_open_by_* functions", "author": "Jan Kara <jack@suse.cz>", "date": "Wed Sep 27 11:34:07 2023 +0200" } */
+
+#include <linux/blkdev.h>
+
+struct bdev_handle *foo(const char *path, blk_mode_t mode, void *holder,
+		const struct blk_holder_ops *hops) {
+	return bdev_open_by_path(path, mode, holder, hops);
+}
diff --git a/drbd/drbd_int.h b/drbd/drbd_int.h
index cf593c09cda1..a41b228cb13b 100644
--- a/drbd/drbd_int.h
+++ b/drbd/drbd_int.h
@@ -700,7 +700,9 @@ struct drbd_md {
 
 struct drbd_backing_dev {
 	struct block_device *backing_bdev;
+	struct bdev_handle *backing_bdev_handle;
 	struct block_device *md_bdev;
+	struct bdev_handle *md_bdev_handle;
 	struct drbd_md md;
 	struct disk_conf __rcu *disk_conf; /* RCU, for updates: resource->conf_update */
 	sector_t known_size; /* last known size of that backing device */
diff --git a/drbd/drbd_nl.c b/drbd/drbd_nl.c
index a355f5d5feb1..6a48287e251e 100644
--- a/drbd/drbd_nl.c
+++ b/drbd/drbd_nl.c
@@ -94,7 +94,7 @@ atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
 
 DEFINE_MUTEX(notification_mutex);
 
-/* used blkdev_get_by_path, to claim our meta data device(s) */
+/* used bdev_open_by_path, to claim our meta data device(s) */
 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
 
 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
@@ -2535,14 +2535,14 @@ bool want_bitmap(struct drbd_peer_device *peer_device)
 	return want_bitmap;
 }
 
-static void close_backing_dev(struct drbd_device *device, struct block_device *bdev,
-	void *holder, bool do_bd_unlink)
+static void close_backing_dev(struct drbd_device *device,
+		struct bdev_handle *handle, bool do_bd_unlink)
 {
-	if (!bdev)
+	if (!handle)
 		return;
 	if (do_bd_unlink)
-		bd_unlink_disk_holder(bdev, device->vdisk);
-	blkdev_put(bdev, holder);
+		bd_unlink_disk_holder(handle->bdev, device->vdisk);
+	bdev_release(handle);
 }
 
 void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev)
@@ -2553,33 +2553,33 @@ void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *
 	drbd_dax_close(ldev);
 
 	close_backing_dev(device,
-			  ldev->md_bdev,
-			  ldev->md.meta_dev_idx < 0 ? (void *)device : (void *)drbd_m_holder,
+			  ldev->md_bdev_handle,
 			  ldev->md_bdev != ldev->backing_bdev);
-	close_backing_dev(device, ldev->backing_bdev, device, true);
+	close_backing_dev(device, ldev->backing_bdev_handle, true);
 
 	kfree(ldev->disk_conf);
 	kfree(ldev);
 }
 
-static struct block_device *open_backing_dev(struct drbd_device *device,
+static struct bdev_handle *open_backing_dev(struct drbd_device *device,
 		const char *bdev_path, void *claim_ptr)
 {
-	struct block_device *bdev = blkdev_get_by_path(bdev_path,
+	struct bdev_handle *handle = bdev_open_by_path(bdev_path,
 				  BLK_OPEN_READ | BLK_OPEN_WRITE,
 				  claim_ptr, NULL);
-	if (IS_ERR(bdev)) {
+	if (IS_ERR(handle)) {
 		drbd_err(device, "open(\"%s\") failed with %ld\n",
-				bdev_path, PTR_ERR(bdev));
+				bdev_path, PTR_ERR(handle));
 	}
-	return bdev;
+	return handle;
 }
 
 static int link_backing_dev(struct drbd_device *device,
-		const char *bdev_path, struct block_device *bdev)
+		const char *bdev_path, struct bdev_handle *handle)
 {
-	int err = bd_link_disk_holder(bdev, device->vdisk);
+	int err = bd_link_disk_holder(handle->bdev, device->vdisk);
 	if (err) {
+		bdev_release(handle);
 		drbd_err(device, "bd_link_disk_holder(\"%s\", ...) failed with %d\n",
 				bdev_path, err);
 	}
@@ -2590,22 +2590,22 @@ static int open_backing_devices(struct drbd_device *device,
 		struct disk_conf *new_disk_conf,
 		struct drbd_backing_dev *nbc)
 {
-	struct block_device *bdev;
+	struct bdev_handle *handle;
 	void *meta_claim_ptr;
 	int err;
 
-	bdev = open_backing_dev(device, new_disk_conf->backing_dev, device);
-	if (IS_ERR(bdev))
+	handle = open_backing_dev(device, new_disk_conf->backing_dev, device);
+	if (IS_ERR(handle))
 		return ERR_OPEN_DISK;
 
-	err = link_backing_dev(device, new_disk_conf->backing_dev, bdev);
+	err = link_backing_dev(device, new_disk_conf->backing_dev, handle);
 	if (err) {
 		/* close without unlinking; otherwise error path will try to unlink */
-		close_backing_dev(device, bdev, device, false);
+		close_backing_dev(device, handle, false);
 		return ERR_OPEN_DISK;
 	}
-
-	nbc->backing_bdev = bdev;
+	nbc->backing_bdev = handle->bdev;
+	nbc->backing_bdev_handle = handle;
 
 	/* meta_claim_ptr: device, if claimed exclusively; shared drbd_m_holder,
 	 * if potentially shared with other drbd minors
@@ -2620,22 +2620,23 @@ static int open_backing_devices(struct drbd_device *device,
 	 * 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, meta_claim_ptr);
-	if (IS_ERR(bdev))
+	handle = open_backing_dev(device, new_disk_conf->meta_dev, meta_claim_ptr);
+	if (IS_ERR(handle))
 		return ERR_OPEN_MD_DISK;
 
 	/* avoid double bd_claim_by_disk() for the same (source,target) tuple,
 	 * as would happen with internal metadata. */
-	if (bdev != nbc->backing_bdev) {
-		err = link_backing_dev(device, new_disk_conf->meta_dev, bdev);
+	if (handle != nbc->backing_bdev_handle) {
+		err = link_backing_dev(device, new_disk_conf->meta_dev, handle);
 		if (err) {
 			/* close without unlinking; otherwise error path will try to unlink */
-			close_backing_dev(device, bdev, meta_claim_ptr, false);
+			close_backing_dev(device, handle, false);
 			return ERR_OPEN_MD_DISK;
 		}
 	}
 
-	nbc->md_bdev = bdev;
+	nbc->md_bdev = handle->bdev;
+	nbc->md_bdev_handle = handle;
 	return NO_ERROR;
 }
 
-- 
2.44.0

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File 0025-compat-drdb-Convert-to-use-bdev_open_by_path.patch of Package drbd (Revision 9b15dc401a5ac4b247d86cd8bd6be1ab)

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