Hi Andrew & others, This is a resend of the patchset to fix page cache coherency with BLKZEROOUT and implement fallocate for block devices. This time I'm sending it direct to Andrew for inclusion because the block layer maintainer has not been responsive over the past year of submissions. Can this please go upstream for 4.9? The first patch is still a fix to the existing BLKZEROOUT ioctl to invalidate the page cache if the zeroing command to the underlying device succeeds. Without this patch we still have the pagecache coherence bug that's been in the kernel forever. The second patch changes the internal block device functions to reject attempts to discard or zeroout that are not aligned to the logical block size. Previously, we only checked that the start/len parameters were 512-byte aligned, which caused kernel BUG_ONs for unaligned IOs to 4k-LBA devices. The third patch creates an fallocate handler for block devices, wires up the FALLOC_FL_PUNCH_HOLE flag to zeroing-discard, and connects FALLOC_FL_ZERO_RANGE to write-same so that we can have a consistent fallocate interface between files and block devices. It also allows the combination of PUNCH_HOLE and NO_HIDE_STALE to invoke non-zeroing discard. Test cases for the new block device fallocate are now in xfstests as generic/349-351. Comments and questions are, as always, welcome. Patches are against 4.8-rc8. v7: Strengthen parameter checking and fix various code issues pointed out by Linus and Christoph. v8: More code rearranging, rebase to 4.6-rc3, and dig into alignment issues. v9: Forward port to 4.7. v10: Forward port to 4.8. Remove the extra call to invalidate_inode_pages2_range per Bart Van Assche's request. --D -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
