Btrfs assumes block size to be the same as the machine's page size. This would mean that a Btrfs instance created on a 4k page size machine (e.g. x86) will not be mountable on machines with larger page sizes (e.g. PPC64/AARCH64). This patchset aims to resolve this incompatibility.
This patchset continues with the work posted previously at http://article.gmane.org/gmane.comp.file-systems.btrfs/52408. I have reverted the upstream commit "btrfs: fix lockups from btrfs_clear_path_blocking" (f82c458a2c3ffb94b431fc6ad791a79df1b3713e) since this led to soft-lockups when the patch "Btrfs: subpagesize-blocksize: Prevent writes to an extent buffer when PG_writeback flag is set" is applied. During 2015's Vault Conference Btrfs meetup, Chris Mason had suggested that he will write up a suitable locking function to be used when writing dirty pages that map metadata blocks. Until we have a suitable locking function available, this patchset temporarily disables the commit f82c458a2c3ffb94b431fc6ad791a79df1b3713e. The commits for the Btrfs kernel module can be found at https://github.com/chandanr/linux/tree/btrfs/subpagesize-blocksize. To create a filesystem with block size < page size, a patched version of the Btrfs-progs package is required. The corresponding fixes for Btrfs-progs can be found at https://github.com/chandanr/btrfs-progs/tree/btrfs/subpagesize-blocksize. Fstests run status: 1. x86_64 - With 4k sectorsize, all the tests that succeed with linux-btrfs/integration-4.5 branch also do so with the patches applied. - With 2k sectorsize, all the *generic* tests that succeed with linux-btrfs/integration-4.5 branch also do so with the patches applied. 2. ppc64 - With 4k sectorsize, 16k nodesize and with "nospace_cache" mount option, all the *generic* tests that succeed with linux-btrfs/integration-4.5 branch also do so with the patches applied. - With 64k sectorsize & nodesize, all the tests that succeed with linux-btrfs/integration-4.5 branch also do so with the patches applied. Changes from V13: 1. Enable dedup ioctl to work in subpagesize-blocksize scenario. Changes from V12: 1. The logic in the function btrfs_punch_hole() has been fixed to check for the presence of BLK_STATE_UPTODATE flags for blocks in pages which partially map the file range being punched. Changes from V11: 1. Addressed the review comments provided by Liu Bo for version V11. 2. Fixed file defragmentation code to work in subpagesize-blocksize scenario. 3. Many "hard to reproduce" bugs were fixed. Chandan Rajendra (15): Btrfs: subpagesize-blocksize: Fix whole page read. Btrfs: subpagesize-blocksize: Fix whole page write Btrfs: subpagesize-blocksize: Make sure delalloc range intersects with the locked page's range Btrfs: subpagesize-blocksize: Define extent_buffer_head. Btrfs: subpagesize-blocksize: Read tree blocks whose size is < PAGE_SIZE. Btrfs: subpagesize-blocksize: Write only dirty extent buffers belonging to a page Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE Btrfs: subpagesize-blocksize: Deal with partial ordered extent allocations. Btrfs: subpagesize-blocksize: Explicitly track I/O status of blocks of an ordered extent. Btrfs: subpagesize-blocksize: btrfs_punch_hole: Fix uptodate blocks check Btrfs: subpagesize-blocksize: Prevent writes to an extent buffer when PG_writeback flag is set. Revert "btrfs: fix lockups from btrfs_clear_path_blocking" Btrfs: subpagesize-blocksize: Fix file defragmentation code Btrfs: subpagesize-blocksize: extent_clear_unlock_delalloc: Prevent page from being unlocked more than once Btrfs: subpagesize-blocksize: Enable dedup ioctl fs/btrfs/backref.c | 2 +- fs/btrfs/ctree.c | 37 +- fs/btrfs/ctree.h | 6 +- fs/btrfs/disk-io.c | 161 +++-- fs/btrfs/disk-io.h | 3 + fs/btrfs/extent-tree.c | 17 +- fs/btrfs/extent_io.c | 1606 ++++++++++++++++++++++++++++++------------ fs/btrfs/extent_io.h | 102 ++- fs/btrfs/file.c | 82 ++- fs/btrfs/inode.c | 491 +++++++++---- fs/btrfs/ioctl.c | 205 ++++-- fs/btrfs/locking.c | 24 +- fs/btrfs/locking.h | 2 - fs/btrfs/ordered-data.c | 19 + fs/btrfs/ordered-data.h | 4 + fs/btrfs/relocation.c | 3 + fs/btrfs/root-tree.c | 2 +- fs/btrfs/volumes.c | 2 +- include/trace/events/btrfs.h | 2 +- 19 files changed, 1966 insertions(+), 804 deletions(-) -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
