On Wed, Sep 15, 2010 at 4:14 AM, McPacino <mcpacino@xxxxxxxxx> wrote: > On Tue, Sep 14, 2010 at 7:09 AM, Andrew Morton > <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: >> >> On Wed, 8 Sep 2010 18:07:10 +0800 >> Cong Meng <mcpacino@xxxxxxxxx> wrote: >> >> > I sent this patch half mount ago, but no response at all. If anything is >> > wrong, please tell me. Thanks a lots. This is my first time to send patch >> > to linux kernel. >> > >> > The invocation of __getblk(bdev, block, size) will cause kernel stall if >> > the @size parameter is not equal to the blockr-size of @bdev, which is saved >> > in bdev->bd_inode->i_blkbits. >> > >> > submit_bh() has the similar problem. >> > >> > This patch calculates the block-size using i_blkbits. >> > So that, for example, __getblk() can get a 4K buffer head while the >> > block-size of @bdev is 1K. >> > >> >> This comes up every couple of years and iirc we always decided that >> it's a bug in the calling code somewhere. How did you hit it? >> > > I am working on a new multi-version snapshot target module for device-mapper > which is almost done. And you hope to have this code included upstream? Do you intend to post your patches to dm-devel? Thanks, Mike -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
