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Subject[PATCH v7 00/22] Support ext4 on NV-DIMMs
Date
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 Linus' 3.14-rc7 (plus Kirill's
patches in linux-next http://marc.info/?l=linux-mm&m=139206489208546&w=2)
and fixes several bugs:

- Initialise cow_page in do_page_mkwrite() (Matthew Wilcox)
- Clear new or unwritten blocks in page fault handler (Matthew Wilcox)
- Only call get_block when necessary (Matthew Wilcox)
- Reword Kconfig options (Matthew Wilcox / Vishal Verma)
- Fix a race between page fault and truncate (Matthew Wilcox)
- Fix a race between fault-for-read and fault-for-write (Matthew Wilcox)
- Zero the correct bytes in dax_new_buf() (Toshi Kani)
- Add DIO_LOCKING to an invocation of dax_do_io in ext4 (Ross Zwisler)

Relative to the last patchset, I folded the 'Add reporting of major faults'
patch into the patch that adds the DAX page fault handler.

The v6 patchset had seven additional xfstests failures. This patchset
now passes approximately as many xfstests as ext4 does on a ramdisk.

Matthew Wilcox (21):
Fix XIP fault vs truncate race
Allow page fault handlers to perform the COW
axonram: Fix bug in direct_access
Change direct_access calling convention
Introduce IS_DAX(inode)
Replace XIP read and write with DAX I/O
Replace the XIP page fault handler with the DAX page fault handler
Replace xip_truncate_page with dax_truncate_page
Remove mm/filemap_xip.c
Remove get_xip_mem
Replace ext2_clear_xip_target with dax_clear_blocks
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
ext4: Make ext4_block_zero_page_range static
ext4: Fix typos
brd: Rename XIP to DAX

Ross Zwisler (1):
ext4: Add DAX functionality

Documentation/filesystems/Locking | 3 -
Documentation/filesystems/dax.txt | 84 ++++++
Documentation/filesystems/ext4.txt | 2 +
Documentation/filesystems/xip.txt | 68 -----
arch/powerpc/sysdev/axonram.c | 8 +-
drivers/block/Kconfig | 13 +-
drivers/block/brd.c | 22 +-
drivers/s390/block/dcssblk.c | 19 +-
fs/Kconfig | 21 +-
fs/Makefile | 1 +
fs/dax.c | 509 +++++++++++++++++++++++++++++++++++++
fs/exofs/inode.c | 1 -
fs/ext2/Kconfig | 11 -
fs/ext2/Makefile | 1 -
fs/ext2/ext2.h | 9 +-
fs/ext2/file.c | 45 +++-
fs/ext2/inode.c | 37 +--
fs/ext2/namei.c | 13 +-
fs/ext2/super.c | 48 ++--
fs/ext2/xip.c | 91 -------
fs/ext2/xip.h | 26 --
fs/ext4/ext4.h | 8 +-
fs/ext4/file.c | 53 +++-
fs/ext4/indirect.c | 19 +-
fs/ext4/inode.c | 94 ++++---
fs/ext4/namei.c | 10 +-
fs/ext4/super.c | 39 ++-
fs/open.c | 5 +-
include/linux/blkdev.h | 4 +-
include/linux/fs.h | 49 +++-
include/linux/mm.h | 2 +
mm/Makefile | 1 -
mm/fadvise.c | 6 +-
mm/filemap.c | 6 +-
mm/filemap_xip.c | 483 -----------------------------------
mm/madvise.c | 2 +-
mm/memory.c | 45 +++-
37 files changed, 984 insertions(+), 874 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

--
1.9.0



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