From: Robin Dong <sanbai@xxxxxxxxxx>
Using mkfs.btrfs like:
mkfs.btrfs -b 1048576 /dev/sda
will report error:
mkfs.btrfs: volumes.c:796: btrfs_alloc_chunk: Assertion `!(ret)' failed.
Aborted
because the length of dev_extent is 4MB.
But if we use mkfs.btrfs with 8MB total bytes, the newly mounted btrfs filesystem
would not contain even one empty file. So 12MB will be good min-value for block_count.
Signed-off-by: Robin Dong <sanbai@xxxxxxxxxx>
---
mkfs.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/mkfs.c b/mkfs.c
index 8420482..496faa8 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1345,7 +1345,11 @@ int main(int ac, char **av)
&dev_block_count, &mixed, nodiscard);
if (block_count == 0)
block_count = dev_block_count;
- else if (block_count > dev_block_count) {
+ else if (block_count < 3 * BTRFS_MKFS_SYSTEM_GROUP_SIZE) {
+ fprintf(stderr, "Illegal total number of bytes %u\n",
+ block_count);
+ exit(1);
+ } else if (block_count > dev_block_count) {
fprintf(stderr, "%s is smaller than requested size\n", file);
exit(1);
}
--
1.7.3.2
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