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 <[email protected]> Signed-off-by: Hidetoshi Seto <[email protected]> --- mkfs.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/mkfs.c b/mkfs.c index b412b7e..a98fe54 100644 --- a/mkfs.c +++ b/mkfs.c @@ -1422,6 +1422,12 @@ 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 + -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
