On 08/27/2014 06:45 AM, Matthew Wilcox wrote: > One of the primary uses for NV-DIMMs is to expose them as a block device > and use a filesystem to store files on the NV-DIMM. While that works, > it currently wastes memory and CPU time buffering the files in the page > cache. We have support in ext2 for bypassing the page cache, but it > has some races which are unfixable in the current design. This series > of patches rewrite the underlying support, and add support for direct > access to ext4. > > Note that patch 6/21 has been included in > https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git/log/?h=for-next-candidate > Matthew hi Could you please push this to the regular or a new public tree? (Old versions are at: https://github.com/01org/prd) Thanks Boaz > This iteration of the patchset rebases to 3.17-rc2, changes the page fault > locking, fixes a couple of bugs and makes a few other minor changes. > > - Move the calculation of the maximum size available at the requested > location from the ->direct_access implementations to bdev_direct_access() > - Fix a comment typo (Ross Zwisler) > - Check that the requested length is positive in bdev_direct_access(). If > it is not, assume that it's an errno, and just return it. > - Fix some whitespace issues flagged by checkpatch > - Added the Acked-by responses from Kirill that I forget in the last round > - Added myself to MAINTAINERS for DAX > - Fixed compilation with !CONFIG_DAX (Vishal Verma) > - Revert the locking in the page fault handler back to an earlier version. > If we hit the race that we were trying to protect against, we will leave > blocks allocated past the end of the file. They will be removed on file > removal, the next truncate, or fsck. > > > Matthew Wilcox (20): > axonram: Fix bug in direct_access > Change direct_access calling convention > Fix XIP fault vs truncate race > Allow page fault handlers to perform the COW > Introduce IS_DAX(inode) > Add copy_to_iter(), copy_from_iter() and iov_iter_zero() > Replace XIP read and write with DAX I/O > Replace ext2_clear_xip_target with dax_clear_blocks > Replace the XIP page fault handler with the DAX page fault handler > Replace xip_truncate_page with dax_truncate_page > Replace XIP documentation with DAX documentation > Remove get_xip_mem > ext2: Remove ext2_xip_verify_sb() > ext2: Remove ext2_use_xip > ext2: Remove xip.c and xip.h > Remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX > ext2: Remove ext2_aops_xip > Get rid of most mentions of XIP in ext2 > xip: Add xip_zero_page_range > brd: Rename XIP to DAX > > Ross Zwisler (1): > ext4: Add DAX functionality > > Documentation/filesystems/Locking | 3 - > Documentation/filesystems/dax.txt | 91 +++++++ > Documentation/filesystems/ext4.txt | 2 + > Documentation/filesystems/xip.txt | 68 ----- > MAINTAINERS | 6 + > arch/powerpc/sysdev/axonram.c | 19 +- > drivers/block/Kconfig | 13 +- > drivers/block/brd.c | 26 +- > drivers/s390/block/dcssblk.c | 21 +- > fs/Kconfig | 21 +- > fs/Makefile | 1 + > fs/block_dev.c | 40 +++ > fs/dax.c | 497 +++++++++++++++++++++++++++++++++++++ > fs/exofs/inode.c | 1 - > fs/ext2/Kconfig | 11 - > fs/ext2/Makefile | 1 - > fs/ext2/ext2.h | 10 +- > fs/ext2/file.c | 45 +++- > fs/ext2/inode.c | 38 +-- > fs/ext2/namei.c | 13 +- > fs/ext2/super.c | 53 ++-- > fs/ext2/xip.c | 91 ------- > fs/ext2/xip.h | 26 -- > fs/ext4/ext4.h | 6 + > fs/ext4/file.c | 49 +++- > fs/ext4/indirect.c | 18 +- > fs/ext4/inode.c | 51 ++-- > fs/ext4/namei.c | 10 +- > fs/ext4/super.c | 39 ++- > fs/open.c | 5 +- > include/linux/blkdev.h | 6 +- > include/linux/fs.h | 49 +++- > include/linux/mm.h | 1 + > include/linux/uio.h | 3 + > mm/Makefile | 1 - > mm/fadvise.c | 6 +- > mm/filemap.c | 6 +- > mm/filemap_xip.c | 483 ----------------------------------- > mm/iov_iter.c | 237 ++++++++++++++++-- > mm/madvise.c | 2 +- > mm/memory.c | 33 ++- > 41 files changed, 1229 insertions(+), 873 deletions(-) > create mode 100644 Documentation/filesystems/dax.txt > delete mode 100644 Documentation/filesystems/xip.txt > create mode 100644 fs/dax.c > delete mode 100644 fs/ext2/xip.c > delete mode 100644 fs/ext2/xip.h > delete mode 100644 mm/filemap_xip.c > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>