• Takashi Sato's avatar
    ext3: support large blocksize up to PAGESIZE · 0f0a89eb
    Takashi Sato authored
    
    
    This patch set supports large block size(>4k, <=64k) in ext3 just enlarging
    the block size limit.  But it is NOT possible to have 64kB blocksize on
    ext3 without some changes to the directory handling code.  The reason is
    that an empty 64kB directory block would have a rec_len == (__u16)2^16 ==
    0, and this would cause an error to be hit in the filesystem.  The proposed
    solution is treat 64k rec_len with a an impossible value like rec_len =
    0xffff to handle this.
    
    The Patch-set consists of the following 2 patches.
      [1/2]  ext3: enlarge blocksize
             - Allow blocksize up to pagesize
    
      [2/2]  ext3: fix rec_len overflow
             - prevent rec_len from overflow with 64KB blocksize
    
    Now on 64k page ppc64 box runs with this patch set we could create a 64k
    block size ext3, and able to handle empty directory block.
    Signed-off-by: default avatarTakashi Sato <sho@tnes.nec.co.jp>
    Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
    Cc: <linux-ext4@vger.kernel.org>
    Acked-by: default avatarChristoph Lameter <clameter@sgi.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    0f0a89eb