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Allow block sizes smaller than backing medium

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Angelo Bulfone 2025-08-21 21:22:08 -07:00 committed by Kent Overstreet
parent 9d90c968b1
commit 4b97a99fa2
1 changed files with 11 additions and 9 deletions
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20
c_src/libbcachefs.c
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@ -201,18 +201,20 @@ struct bch_sb *bch2_format(struct bch_opt_strs fs_opt_strs,
dev_opts_list devs) dev_opts_list devs)
{ {
struct bch_sb_handle sb = { NULL }; struct bch_sb_handle sb = { NULL };
unsigned max_dev_block_size = 0;
darray_for_each(devs, i)
max_dev_block_size = max(max_dev_block_size, get_blocksize(i->bdev->bd_fd));
/* calculate block size: */ /* calculate block size: */
if (!opt_defined(fs_opts, block_size)) if (!opt_defined(fs_opts, block_size)) {
opt_set(fs_opts, block_size, max_dev_block_size); unsigned max_dev_block_size = 0;
darray_for_each(devs, i)
max_dev_block_size = max(max_dev_block_size, get_blocksize(i->bdev->bd_fd));
if (fs_opts.block_size < max_dev_block_size) opt_set(fs_opts, block_size, max_dev_block_size);
die("blocksize too small: %u, must be greater than device blocksize %u", }
fs_opts.block_size, max_dev_block_size);
if (fs_opts.block_size < 512)
die("blocksize too small: %u, must be greater than one sector (512 bytes)",
fs_opts.block_size);
/* get device size, if it wasn't specified: */ /* get device size, if it wasn't specified: */
darray_for_each(devs, i) darray_for_each(devs, i)