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This series introduces a method to issue atomic writes via a software-based method. The software-based method is used as a fallback for when attempting to issue an atomic write over misaligned or multiple extents. For xfs, this support is based on reflink CoW support. The basic idea of this CoW method is to alloc a range in the CoW fork, write the data, and atomically update the mapping. Initial mysql performance testing has shown this method to perform ok. However, there we are only using 16K atomic writes (and 4K block size), so typically - and thankfully - this software fallback method won't be used often. For other FSes which want large atomics writes and don't support CoW, I think that they can follow the example in [0]. Catherine is currently working on further xfstests for this feature, which we hope to share soon. Based on f0447f80aec8 (xfs/next-rc, xfs/for-next) xfs: remove duplicate Zoned Filesystems sections in admin-guide [0] https://lore.kernel.org/linux-xfs/20250310183946.932054-1-john.g.garry@oracle.com/ Differences to v8: - Darrick reworked patch for mount option - Darrick reworked patch to ignore HW - Minor changes and cleanups from Darrick - Rework some commit messages (Christoph) - Pick up RB tags from Christoph (thanks!) Differences to v7: - Add patch for mp hw awu max and min - Fixed for awu max mount option (Darrick) Differences to v6: - log item sizes updates (Darrick) - rtvol support (Darrick) - mount option for atomic writes (Darrick) - Add RB tags from Darrick and Christoph (Thanks!) Darrick J. Wong (4): xfs: add helpers to compute log item overhead xfs: add helpers to compute transaction reservation for finishing intent items xfs: ignore HW which cannot atomic write a single block xfs: allow sysadmins to specify a maximum atomic write limit at mount time John Garry (11): fs: add atomic write unit max opt to statx xfs: rename xfs_inode_can_atomicwrite() -> xfs_inode_can_hw_atomic_write() xfs: allow block allocator to take an alignment hint xfs: refactor xfs_reflink_end_cow_extent() xfs: refine atomic write size check in xfs_file_write_iter() xfs: add xfs_atomic_write_cow_iomap_begin() xfs: add large atomic writes checks in xfs_direct_write_iomap_begin() xfs: commit CoW-based atomic writes atomically xfs: add xfs_file_dio_write_atomic() xfs: add xfs_compute_atomic_write_unit_max() xfs: update atomic write limits Documentation/admin-guide/xfs.rst | 11 + block/bdev.c | 3 +- fs/ext4/inode.c | 2 +- fs/stat.c | 6 +- fs/xfs/libxfs/xfs_bmap.c | 5 + fs/xfs/libxfs/xfs_bmap.h | 6 +- fs/xfs/libxfs/xfs_log_rlimit.c | 4 + fs/xfs/libxfs/xfs_trans_resv.c | 343 +++++++++++++++++++++++++++--- fs/xfs/libxfs/xfs_trans_resv.h | 25 +++ fs/xfs/xfs_bmap_item.c | 10 + fs/xfs/xfs_bmap_item.h | 3 + fs/xfs/xfs_buf.c | 41 +++- fs/xfs/xfs_buf.h | 3 +- fs/xfs/xfs_buf_item.c | 19 ++ fs/xfs/xfs_buf_item.h | 3 + fs/xfs/xfs_extfree_item.c | 10 + fs/xfs/xfs_extfree_item.h | 3 + fs/xfs/xfs_file.c | 87 +++++++- fs/xfs/xfs_inode.h | 14 +- fs/xfs/xfs_iomap.c | 190 ++++++++++++++++- fs/xfs/xfs_iomap.h | 1 + fs/xfs/xfs_iops.c | 76 ++++++- fs/xfs/xfs_iops.h | 3 + fs/xfs/xfs_log_cil.c | 4 +- fs/xfs/xfs_log_priv.h | 13 ++ fs/xfs/xfs_mount.c | 166 +++++++++++++++ fs/xfs/xfs_mount.h | 17 ++ fs/xfs/xfs_refcount_item.c | 10 + fs/xfs/xfs_refcount_item.h | 3 + fs/xfs/xfs_reflink.c | 146 ++++++++++--- fs/xfs/xfs_reflink.h | 6 + fs/xfs/xfs_rmap_item.c | 10 + fs/xfs/xfs_rmap_item.h | 3 + fs/xfs/xfs_super.c | 58 ++++- fs/xfs/xfs_trace.h | 115 ++++++++++ include/linux/fs.h | 3 +- include/linux/stat.h | 1 + include/uapi/linux/stat.h | 8 +- 38 files changed, 1322 insertions(+), 109 deletions(-) -- 2.31.1