This series of patches add support for XIP to ext4. Unfortunately, it turns out to be necessary to rewrite the existing XIP support code first due to races that are unfixable in the current design. Since v4 of this patchset, I've improved the documentation, fixed a couple of warnings that a newer version of gcc emitted, and fixed a bug where we would read/write the wrong address for I/Os that were not aligned to PAGE_SIZE. I've dropped the PMD fault patch from this set since there are some places where we would need to split a PMD page and there's no way to do that right now. In its place, I've added a patch which attempts to add support for unwritten extents. I'm still in two minds about this; on the one hand, it's clearly a win for reads and writes. On the other hand, it adds a lot of complexity, and it probably isn't a win for pagefaults. Patch 2 wants careful review from the MM people. 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_XIP(inode) Treat XIP like O_DIRECT Rewrite XIP page fault handling Change xip_truncate_page to take a get_block parameter Remove mm/filemap_xip.c Remove get_xip_mem Replace ext2_clear_xip_target with xip_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 ext2: Remove ext2_aops_xip xip: Add xip_zero_page_range ext4: Make ext4_block_zero_page_range static ext4: Fix typos xip: Add reporting of major faults XIP: Add support for unwritten extents Ross Zwisler (1): ext4: Add XIP functionality Documentation/filesystems/Locking | 3 - Documentation/filesystems/ext4.txt | 2 + Documentation/filesystems/xip.txt | 126 +++++----- arch/powerpc/sysdev/axonram.c | 8 +- drivers/block/brd.c | 8 +- drivers/s390/block/dcssblk.c | 19 +- fs/Kconfig | 21 +- fs/Makefile | 1 + fs/exofs/inode.c | 1 - fs/ext2/Kconfig | 11 - fs/ext2/Makefile | 1 - fs/ext2/ext2.h | 1 - fs/ext2/file.c | 43 +++- fs/ext2/inode.c | 35 +-- fs/ext2/namei.c | 9 +- fs/ext2/super.c | 38 ++- fs/ext2/xip.c | 91 ------- fs/ext2/xip.h | 26 -- fs/ext4/ext4.h | 4 +- fs/ext4/file.c | 53 +++- fs/ext4/indirect.c | 19 +- fs/ext4/inode.c | 106 +++++--- fs/ext4/namei.c | 10 +- fs/ext4/super.c | 39 ++- fs/open.c | 5 +- fs/xip.c | 428 ++++++++++++++++++++++++++++++++ include/linux/blkdev.h | 4 +- include/linux/fs.h | 47 +++- 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 | 19 +- 35 files changed, 851 insertions(+), 827 deletions(-) delete mode 100644 fs/ext2/xip.c delete mode 100644 fs/ext2/xip.h create mode 100644 fs/xip.c delete mode 100644 mm/filemap_xip.c -- 1.8.5.2 -- 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>