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). The fifth patch changes the behaviour of dax_do_io by adding a wrapper around it that is passed all the arguments also needed by __blockdev_do_direct_IO. If (the new) __dax_do_io fails with -EIO due to a bad block, we simply retry with the direct_IO path which forces the IO to go through the block driver, and can attempt to clear the error. Patch 6 reduces our calls to clear_pmem from dax in the truncate/hole-punch cases. We check if the range being truncated is sector aligned/sized, and if so, send blkdev_issue_zeroout instead of clear_pmem so that errors can be handled better by the driver. Patch 7 fixes a redundant comment in DAX and is mostly unrelated to the rest of this series. This series also depends on/is based on Jan Kara's DAX Locking fixes series [1]. [1]: http://www.spinics.net/lists/linux-mm/msg105819.html v3: - Wrapper-ize the direct_IO fallback again and make an exception for -EIOCBQUEUED (Jeff, Dan) - Reduce clear_pmem usage in DAX to the minimum 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) Matthew Wilcox (1): dax: use sb_issue_zerout instead of calling dax_clear_sectors Vishal Verma (3): dax: handle media errors in dax_do_io dax: for truncate/hole-punch, do zeroing through the driver if possible dax: fix a comment in dax_zero_page_range and dax_truncate_page 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 | 7 ++-- fs/dax.c | 78 +++++++++++++++---------------------------- fs/ext2/inode.c | 12 +++---- fs/ext4/inode.c | 5 +-- fs/xfs/xfs_aops.c | 8 ++--- fs/xfs/xfs_bmap_util.c | 15 +++------ include/linux/blkdev.h | 3 +- include/linux/dax.h | 31 ++++++++++++++++- 13 files changed, 108 insertions(+), 108 deletions(-) -- 2.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
