• Dan Streetman's avatar
    zpool: add zpool_has_pool() · 3f0e1312
    Dan Streetman authored
    This series makes creation of the zpool and compressor dynamic, so that
    they can be changed at runtime.  This makes using/configuring zswap
    easier, as before this zswap had to be configured at boot time, using boot
    params.
    
    This uses a single list to track both the zpool and compressor together,
    although Seth had mentioned an alternative which is to track the zpools
    and compressors using separate lists.  In the most common case, only a
    single zpool and single compressor, using one list is slightly simpler
    than using two lists, and for the uncommon case of multiple zpools and/or
    compressors, using one list is slightly less simple (and uses slightly
    more memory, probably) than using two lists.
    
    This patch (of 4):
    
    Add zpool_has_pool() function, indicating if the specified type of zpool
    is available (i.e.  zsmalloc or zbud).  This allows checking if a pool is
    available, without actually trying to allocate it, similar to
    crypto_has_alg().
    
    This is used by a following patch to zswap that enables the dynamic
    runtime creation of zswap zpools.
    Signed-off-by: default avatarDan Streetman <ddstreet@ieee.org>
    Acked-by: default avatarSeth Jennings <sjennings@variantweb.net>
    Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    3f0e1312
zpool.c 9.86 KB