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 how DAX IO is re-routed as direct IO. We add a new iocb flag for DAX to distinguish it from actual direct IO, and if we're in O_DIRECT, use the regular direct_IO path instead of DAX. This gives us an opportunity to do recovery by doing O_DIRECT writes that will go through the driver to clear errors from bad sectors. 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 v4: - Remove the dax->direct_IO fallbacks entirely. Instead, go through the usual direct_IO path when we're in O_DIRECT, and use dax_IO for other, non O_DIRECT IO. (Dan, Christoph) 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): fs: prioritize and separate direct_io from dax_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/block/loop.c | 2 +- drivers/nvdimm/pmem.c | 17 +++++++--- drivers/s390/block/dcssblk.c | 12 +++---- fs/block_dev.c | 19 ++++++++--- fs/dax.c | 78 +++++++++++++++---------------------------- fs/ext2/inode.c | 23 ++++++++----- fs/ext4/file.c | 2 +- fs/ext4/inode.c | 19 +++++++---- fs/xfs/xfs_aops.c | 20 +++++++---- fs/xfs/xfs_bmap_util.c | 15 +++------ fs/xfs/xfs_file.c | 4 +-- include/linux/blkdev.h | 3 +- include/linux/dax.h | 1 - include/linux/fs.h | 15 +++++++-- mm/filemap.c | 4 +-- 18 files changed, 134 insertions(+), 128 deletions(-) -- 2.5.5 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
