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Date: Fri, 01 Aug 2014 14:53:06 -0600 From: Ross Zwisler <ross.zwisler@...ux.intel.com> To: "Wilcox, Matthew R" <matthew.r.wilcox@...el.com>, Boaz Harrosh <openosd@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH v9 00/22] Support ext4 on NV-DIMMs On Fri, 2014-08-01 at 09:27 -0400, Matthew Wilcox wrote: > From: Matthew Wilcox <willy@...ux.intel.com> > > 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. > > This iteration of the patchset rebases to 3.16-rc7 and makes substantial > changes based on feedback from Jan Kara, Boaz Harrosh and Kirill Shutemov: > > - Fixes a double-unlock on i_mmap_mutex > - Switch the order of calling delete_from_page_cache() and > unmap_mapping_range() to match the truncate path > - Make dax_mkwrite a macro (Kirill) > - Drop vm_replace_mixed(); instead call unmap_mapping_range() before calling > vm_insert_mixed() (Kirill) > - Avoid lock inversion between i_mmap_mutex and transaction start (Jan) > - Move alignment & length checks into bdev_direct_access() (Boaz) > - Fix bugs in COW code; unfortunately this means reintroducing the knowledge > that the i_mmap_mutex protects PFNs to the core MM code. > > Jan Kara (1): > ext4: Avoid lock inversion between i_mmap_mutex and transaction start > > 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 ------ > 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 | 34 +++ > fs/dax.c | 476 ++++++++++++++++++++++++++++++++++++ > 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 | 53 +++- > fs/ext4/indirect.c | 18 +- > fs/ext4/inode.c | 65 +++-- > 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 ++- > 40 files changed, 1206 insertions(+), 881 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 I've updated the master branch of PRD's GitHub repo (https://github.com/01org/prd) so that it is Linus's tip + DAX v9 + PRD. I've also added a patch to PRD to enable dynamic allocation of partition numbers. - Ross -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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