On (04/28/16 05:13), Dan Streetman wrote:
> Instead of using "zswap" as the name for all zpools created, add
> an atomic counter and use "zswap%x" with the counter number for each
> zpool created, to provide a unique name for each new zpool.
>
> As zsmalloc, one of the zpool implementations, requires/expects a
> unique name for each pool created, zswap should provide a unique name.
> The zsmalloc pool creation does not fail if a new pool with a
> conflicting name is created, unless CONFIG_ZSMALLOC_STAT is enabled;
> in that case, zsmalloc pool creation fails with -ENOMEM. Then zswap
> will be unable to change its compressor parameter if its zpool is
> zsmalloc; it also will be unable to change its zpool parameter back
> to zsmalloc, if it has any existing old zpool using zsmalloc with
> page(s) in it. Attempts to change the parameters will result in
> failure to create the zpool. This changes zswap to provide a
> unique name for each zpool creation.
>
> Fixes: f1c54846ee45 ("zswap: dynamic pool creation")
> Reported-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
> Cc: Dan Streetman <dan.streetman@xxxxxxxxxxxxx>
> Signed-off-by: Dan Streetman <ddstreet@xxxxxxxx>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
-ss
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