On Tue, 18 Aug 2015 16:06:00 -0400 Dan Streetman <ddstreet@xxxxxxxx> wrote:
> Add ZPOOL_MAX_TYPE_NAME define, and change zpool_driver *type field to
> type[ZPOOL_MAX_TYPE_NAME]. Remove redundant type field from struct zpool
> and use zpool->driver->type instead.
>
> The define will be used by zswap for its zpool param type name length.
>
Patchset is fugly. All this putzing around with fixed-length strings,
worrying about overflow and is-it-null-terminated-or-isnt-it. Shudder.
It's much better to use variable-length strings everywhere. We're not
operating in contexts which can't use kmalloc, we're not
performance-intensive and these strings aren't being written to
fixed-size fields on disk or anything. Why do we need any fixed-length
strings?
IOW, why not just replace that alloca with a kstrdup()?
> --- a/include/linux/zpool.h
> +++ b/include/linux/zpool.h
>
> ...
>
> @@ -79,7 +77,7 @@ static struct zpool_driver *zpool_get_driver(char *type)
>
> spin_lock(&drivers_lock);
> list_for_each_entry(driver, &drivers_head, list) {
> - if (!strcmp(driver->type, type)) {
> + if (!strncmp(driver->type, type, ZPOOL_MAX_TYPE_NAME)) {
Why strncmp? Please tell me these strings are always null-terminated.
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