From: Vishal Verma Subject: [PATCH v2 0/5] dax: handling of media errors Date: Tue, 29 Mar 2016 19:59:45 -0600 Message-ID: <1459303190-20072-1-git-send-email-vishal.l.verma@intel.com> Cc: Vishal Verma , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, xfs@oss.sgi.com, linux-ext4@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox , Ross Zwisler , Dan Williams , Dave Chinner , Jan Kara , Jens Axboe , Al Viro , Andrew Morton , linux-kernel@vger.kernel.org, Christoph Hellwig To: linux-nvdimm@lists.01.org Return-path: Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org Until now, dax has been disabled if media errors were found on any device. This series attempts to address that. The first three patches from Dan re-enable dax even when media errors are present. The fourth patch from Matthew removes the zeroout path from dax entirely, making zeroout operations always go through the driver (The motivation is that if a backing device has media errors, and we create a sparse file on it, we don't want the initial zeroing to happen via dax, we want to give the block driver a chance to clear the errors). One pending item is addressing clear_pmem usages in dax.c. clear_pmem is 'unsafe' as it attempts to simply memcpy, and does not go through the driver. We have a few options of solving this: 1. Remove all usages of clear_pmem that are not sector-aligned. For the ones that are aligned, replace them with a bio submission that goes through the driver to clear errors. 2. Export from the block layer, either an API to zero sub-sector ranges, or in general, clear errors in a range. The dax attempts to clear_pmem can then use either of these and not be hit be media errors. I'll send out a v3 with a crack at option 1, but I wanted to get these changes (especially the ones in xfs) out for review. The fifth patch changes all the callers of dax_do_io to check for EIO, and fallback to direct_IO as needed. This forces the IO to go through the block driver, and can attempt to clear the error. v2: - Use blockdev_issue_zeroout in xfs instead of sb_issue_zeroout (Christoph) - Un-wrapper-ize dax_do_io and leave the fallback to direct_IO to callers (Christoph) - Rebase to v4.6-rc1 (fixup a couple of conflicts in ext4 and xfs) Dan Williams (3): block, dax: pass blk_dax_ctl through to drivers dax: fallback from pmd to pte on error dax: enable dax in the presence of known media errors (badblocks) Vishal Verma (2): dax: use sb_issue_zerout instead of calling dax_clear_sectors dax: handle media errors in dax_do_io arch/powerpc/sysdev/axonram.c | 10 +++++----- block/ioctl.c | 9 --------- drivers/block/brd.c | 9 +++++---- drivers/nvdimm/pmem.c | 17 +++++++++++++---- drivers/s390/block/dcssblk.c | 12 ++++++------ fs/block_dev.c | 19 +++++++++++++++---- fs/dax.c | 36 ++---------------------------------- fs/ext2/inode.c | 29 ++++++++++++++++++----------- fs/ext4/indirect.c | 18 +++++++++++++----- fs/ext4/inode.c | 21 ++++++++++++++------- fs/xfs/xfs_aops.c | 14 ++++++++++++-- fs/xfs/xfs_bmap_util.c | 15 ++++----------- include/linux/blkdev.h | 3 +-- include/linux/dax.h | 1 - 14 files changed, 108 insertions(+), 105 deletions(-) -- 2.5.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org