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btrfs: sysfs: refactor output formatting in btrfs_read_policy_show()

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Refactor the logic in btrfs_read_policy_show() for easier extension with
more balancing methods.  Streamline the space and bracket handling
around the active policy without altering the functional output.  This
is in preparation to add more methods.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2025-01-02 02:06:31 +08:00 committed by David Sterba
parent a5019b7070
commit 83be7f8b9c
1 changed files with 10 additions and 8 deletions
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18
fs/btrfs/sysfs.c
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@ -1316,14 +1316,16 @@ static ssize_t btrfs_read_policy_show(struct kobject *kobj,
int i; int i;
for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
if (policy == i) if (ret != 0)
ret += sysfs_emit_at(buf, ret, "%s[%s]", ret += sysfs_emit_at(buf, ret, " ");
(ret == 0 ? "" : " "),
btrfs_read_policy_name[i]); if (i == policy)
else ret += sysfs_emit_at(buf, ret, "[");
ret += sysfs_emit_at(buf, ret, "%s%s",
(ret == 0 ? "" : " "), ret += sysfs_emit_at(buf, ret, "%s", btrfs_read_policy_name[i]);
btrfs_read_policy_name[i]);
if (i == policy)
ret += sysfs_emit_at(buf, ret, "]");
} }
ret += sysfs_emit_at(buf, ret, "\n"); ret += sysfs_emit_at(buf, ret, "\n");