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Fix bch2_super_write() alignment

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We're about to switch to O_DIRECT only, which means we need to write
with proper alignment.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-01-10 22:26:49 -05:00
parent 9a9af6e9e6
commit 2007d9b6ce
1 changed files with 13 additions and 3 deletions
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16
libbcachefs.c
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@ -342,6 +342,7 @@ struct bch_sb *bch2_format(struct bch_opt_strs fs_opt_strs,
void bch2_super_write(int fd, struct bch_sb *sb)
{
struct nonce nonce = { 0 };
unsigned bs = get_blocksize(fd);
unsigned i;
for (i = 0; i < sb->layout.nr_superblocks; i++) {
@ -349,13 +350,22 @@ void bch2_super_write(int fd, struct bch_sb *sb)
if (sb->offset == BCH_SB_SECTOR) {
/* Write backup layout */
xpwrite(fd, &sb->layout, sizeof(sb->layout),
BCH_SB_LAYOUT_SECTOR << 9,
BUG_ON(bs > 4096);
char *buf = aligned_alloc(bs, bs);
xpread(fd, buf, bs, 4096 - bs);
memcpy(buf + bs - sizeof(sb->layout),
&sb->layout,
sizeof(sb->layout));
xpwrite(fd, buf, bs, 4096 - bs,
"backup layout");
free(buf);
}
sb->csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb), nonce, sb);
xpwrite(fd, sb, vstruct_bytes(sb),
xpwrite(fd, sb, round_up(vstruct_bytes(sb), bs),
le64_to_cpu(sb->offset) << 9,
"superblock");
}