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File 3001-btrfs-progs-Introduce-function-to-fix-unaligned-devi.patch of Package btrfsprogs (Revision 284f19b03a5b80740585ce2295b7a003)

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From: Qu Wenruo <wqu@suse.com>
Date: Tue, 17 Oct 2017 13:00:41 +0800
Subject: btrfs-progs: Introduce function to fix unaligned device size
Git-commit: ea9cd9df2be56041e2d62b0e72c77695b03261f7
Patch-mainline: v4.14
References: bsc#1083287

Recent kernel introduced alignment check for dev item, however older
kernel doesn't align device size when adding new device or shrinking
existing device.

This makes noisy kernel warning every time when any DEV_ITEM gets updated.

Introduce function to fix device size on an unmounted filesystem.

Reported-by: Asif Youssuff <yoasif@gmail.com>
Reported-by: Rich Rauenzahn <rrauenza@gmail.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 volumes.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 volumes.h |  2 ++
 2 files changed, 71 insertions(+)

Index: btrfs-progs-v4.5.3/volumes.c
===================================================================
--- btrfs-progs-v4.5.3.orig/volumes.c
+++ btrfs-progs-v4.5.3/volumes.c
@@ -2148,3 +2148,72 @@ int write_raid56_with_parity(struct btrf
 
 	return 0;
 }
+
+/*
+ * Return 0 if size of @device is already good
+ * Return >0 if size of @device is not aligned but fixed without problems
+ * Return <0 if something wrong happened when aligning the size of @device
+ */
+int btrfs_fix_device_size(struct btrfs_fs_info *fs_info,
+			  struct btrfs_device *device)
+{
+	struct btrfs_trans_handle *trans;
+	struct btrfs_key key;
+	struct btrfs_path path;
+	struct btrfs_root *chunk_root = fs_info->chunk_root;
+	struct btrfs_dev_item *di;
+	u64 old_bytes = device->total_bytes;
+	u32 sectorsize = chunk_root->sectorsize;
+	int ret;
+
+	if (IS_ALIGNED(old_bytes, sectorsize))
+		return 0;
+
+	/* Align the in-memory total_bytes first, and use it as correct size */
+	device->total_bytes = round_down(device->total_bytes, sectorsize);
+
+	key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+	key.type = BTRFS_DEV_ITEM_KEY;
+	key.offset = device->devid;
+
+	trans = btrfs_start_transaction(chunk_root, 1);
+	if (IS_ERR(trans)) {
+		ret = PTR_ERR(trans);
+		error("error starting transaction: %d (%s)",
+		      ret, strerror(-ret));
+		return ret;
+	}
+
+	btrfs_init_path(&path);
+	ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
+	if (ret > 0) {
+		error("failed to find DEV_ITEM for devid %llu", device->devid);
+		ret = -ENOENT;
+		goto err;
+	}
+	if (ret < 0) {
+		error("failed to search chunk root: %d (%s)",
+			ret, strerror(-ret));
+		goto err;
+	}
+	di = btrfs_item_ptr(path.nodes[0], path.slots[0], struct btrfs_dev_item);
+	btrfs_set_device_total_bytes(path.nodes[0], di, device->total_bytes);
+	btrfs_mark_buffer_dirty(path.nodes[0]);
+	ret = btrfs_commit_transaction(trans, chunk_root);
+	if (ret < 0) {
+		error("failed to commit current transaction: %d (%s)",
+			ret, strerror(-ret));
+		btrfs_release_path(&path);
+		return ret;
+	}
+	btrfs_release_path(&path);
+	printf("Fixed device size for devid %llu, old size: %llu new size: %llu\n",
+		device->devid, old_bytes, device->total_bytes);
+	return 1;
+
+err:
+	/* We haven't modified anything, it's OK to commit current trans */
+	btrfs_commit_transaction(trans, chunk_root);
+	btrfs_release_path(&path);
+	return ret;
+}
Index: btrfs-progs-v4.5.3/volumes.h
===================================================================
--- btrfs-progs-v4.5.3.orig/volumes.h
+++ btrfs-progs-v4.5.3/volumes.h
@@ -226,4 +226,6 @@ int write_raid56_with_parity(struct btrf
 			     struct extent_buffer *eb,
 			     struct btrfs_multi_bio *multi,
 			     u64 stripe_len, u64 *raid_map);
+int btrfs_fix_device_size(struct btrfs_fs_info *fs_info,
+			  struct btrfs_device *device);
 #endif

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File 3001-btrfs-progs-Introduce-function-to-fix-unaligned-devi.patch of Package btrfsprogs (Revision 284f19b03a5b80740585ce2295b7a003)

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