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Fix total_data_blocks calculation in mkfs

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mkfs was incorrectly initializing total_data_blocks.  The field is meant
to record the number of blocks from the start of the device that the
filesystem could access.  mkfs was subtracting the initial reserved area
of the device, meaning the number of blocks that the filesystem might
access.

This could allow accesses past devices if mount checks the device size
against the smaller total_data_blocks.

And we're about to use total_data_blocks as the start of a new extent to
add when growing the volume.  It needs to be fixed so that this new
grown free extent doesn't overlap with the end of the existing free
extents.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2021-07-29 16:02:14 -07:00
parent 4c1181c055
commit fd686cab86
1 changed files with 2 additions and 2 deletions
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4
utils/src/mkfs.c
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@@ -241,7 +241,7 @@ static int do_mkfs(struct mkfs_args *args)
super->next_ino = cpu_to_le64(SCOUTFS_ROOT_INO + 1);
super->seq = cpu_to_le64(1);
super->total_meta_blocks = cpu_to_le64(last_meta + 1);
super->total_data_blocks = cpu_to_le64(last_data - first_data + 1);
super->total_data_blocks = cpu_to_le64(last_data + 1);
assert(sizeof(args->slots) ==
member_sizeof(struct scoutfs_super_block, qconf.slots));
@@ -316,7 +316,7 @@ static int do_mkfs(struct mkfs_args *args)
blkno = next_meta++;
ret = write_alloc_root(meta_fd, fsid, &super->data_alloc, bt,
1, blkno, first_data,
le64_to_cpu(super->total_data_blocks));
last_data - first_data + 1);
if (ret < 0)
goto out;