From: Christoph Hellwig Date: Fri, 31 Oct 2025 13:10:27 +0000 (+0100) Subject: xfs: support sub-block aligned vectors in always COW mode X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8caec6c9fef70c0d0ce1bf38ad343e18e5e1f6a0;p=thirdparty%2Flinux.git xfs: support sub-block aligned vectors in always COW mode Now that the block layer and iomap have grown support to indicate the bio sector size explicitly instead of assuming the device sector size, we can ask for logical block size alignment and thus support direct I/O writes where the overall size is logical block size aligned, but the boundaries between vectors might not be. Signed-off-by: Christoph Hellwig Link: https://patch.msgid.link/20251031131045.1613229-3-hch@lst.de Reviewed-by: Darrick J. Wong Signed-off-by: Christian Brauner --- diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 5b9864c8582e5..6108612182e2f 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -676,8 +676,17 @@ xfs_file_dio_write_aligned( struct xfs_zone_alloc_ctx *ac) { unsigned int iolock = XFS_IOLOCK_SHARED; + unsigned int dio_flags = 0; ssize_t ret; + /* + * For always COW inodes, each bio must be aligned to the file system + * block size and not just the device sector size because we need to + * allocate a block-aligned amount of space for each write. + */ + if (xfs_is_always_cow_inode(ip)) + dio_flags |= IOMAP_DIO_FSBLOCK_ALIGNED; + ret = xfs_ilock_iocb_for_write(iocb, &iolock); if (ret) return ret; @@ -695,7 +704,7 @@ xfs_file_dio_write_aligned( iolock = XFS_IOLOCK_SHARED; } trace_xfs_file_direct_write(iocb, from); - ret = iomap_dio_rw(iocb, from, ops, dops, 0, ac, 0); + ret = iomap_dio_rw(iocb, from, ops, dops, dio_flags, ac, 0); out_unlock: xfs_iunlock(ip, iolock); return ret; @@ -892,15 +901,7 @@ xfs_file_dio_write( if ((iocb->ki_pos | count) & target->bt_logical_sectormask) return -EINVAL; - /* - * For always COW inodes we also must check the alignment of each - * individual iovec segment, as they could end up with different - * I/Os due to the way bio_iov_iter_get_pages works, and we'd - * then overwrite an already written block. - */ - if (((iocb->ki_pos | count) & ip->i_mount->m_blockmask) || - (xfs_is_always_cow_inode(ip) && - (iov_iter_alignment(from) & ip->i_mount->m_blockmask))) + if ((iocb->ki_pos | count) & ip->i_mount->m_blockmask) return xfs_file_dio_write_unaligned(ip, iocb, from); if (xfs_is_zoned_inode(ip)) return xfs_file_dio_write_zoned(ip, iocb, from);