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btrfs-progs: mkfs: use sbwrite to update superblock in regular and zoned mode

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Use sbwrite instead of pwrite to support superblock logging in zoned
mode.  In addition, call fsync() to persist the superblock to ensure the
write order. It also helps us to detect an unaligned write (write to a
position other than the write pointer) error.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2021-04-26 15:27:39 +09:00 committed by David Sterba
parent de677ad21d
commit 9d42778b48
1 changed files with 5 additions and 2 deletions
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7
mkfs/common.c
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@ -472,13 +472,16 @@ int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
buf->len = BTRFS_SUPER_INFO_SIZE;
csum_tree_block_size(buf, btrfs_csum_type_size(cfg->csum_type), 0,
cfg->csum_type);
ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE,
cfg->blocks[MKFS_SUPER_BLOCK]);
ret = sbwrite(fd, buf->data, cfg->blocks[MKFS_SUPER_BLOCK]);
if (ret != BTRFS_SUPER_INFO_SIZE) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
ret = fsync(fd);
if (ret)
goto out;
ret = 0;
out: