File 0059-btrfs-progs-error-if-device-for-mkfs-is-to... of Package btrfsprogs

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File 0059-btrfs-progs-error-if-device-for-mkfs-is-too-small.patch of Package btrfsprogs (Revision a1fa8706ea6f674729b1ea3cd3930007)

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From 684d9a33f77967a9b50b597cece1b2b2e29d2b8d Mon Sep 17 00:00:00 2001
From: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Date: Thu, 5 Sep 2013 15:53:34 +0900
Subject: [PATCH 59/62] btrfs-progs: error if device for mkfs is too small

Eric pointed out that mkfs abort if specified volume is too small:

# truncate --size=2m testfile
  # ./mkfs.btrfs testfile
   :
  SMALL VOLUME: forcing mixed metadata/data groups
  mkfs.btrfs: volumes.c:852: btrfs_alloc_chunk: Assertion `!(ret)' failed.
  Aborted (core dumped)

As the first step to fix problems around there, let mkfs to report
error if the size of target volume is less than the size of the first
system block group, BTRFS_MKFS_SYSTEM_GROUP_SIZE (= 4MB).

Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---
 mkfs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mkfs.c b/mkfs.c
index 8a68f8a9f762..9a017c1dc95b 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1400,6 +1400,12 @@ int main(int ac, char **av)
 		}
 	}
 
+	/* To create the first block group and chunk 0 in make_btrfs */
+	if (dev_block_count < BTRFS_MKFS_SYSTEM_GROUP_SIZE) {
+		fprintf(stderr, "device is too small to make filesystem\n");
+		exit(1);
+	}
+ 
 	blocks[0] = BTRFS_SUPER_INFO_OFFSET;
 	for (i = 1; i < 7; i++) {
 		blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
-- 
1.8.3.1

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File 0059-btrfs-progs-error-if-device-for-mkfs-is-too-small.patch of Package btrfsprogs (Revision a1fa8706ea6f674729b1ea3cd3930007)

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