On Wed, Nov 20, 2019 at 10:24:20AM -0800, Omar Sandoval wrote: > From: Omar Sandoval <osandov@xxxxxx> > > Hello, > > This series adds an API for reading compressed data on a filesystem > without decompressing it as well as support for writing compressed data > directly to the filesystem. As with the previous submissions, I've > included a man page patch describing the API, and test cases and example > programs are available [1]. > > This version reworks the VFS interface to be backward and forward > compatible and support for writing inline and bookend extents to the > Btrfs implementation. > > Patches 1-3 add the VFS support. Patches 4-7 are Btrfs cleanups > necessary for the encoded I/O support that can go in independently of > this series. Patches 8-10 are Btrfs prep patches. Patch 11 adds Btrfs > encoded read support and patch 12 adds Btrfs encoded write support. > > A few TODOs remain: > > - Once we've settled on the interface, I'll add RWF_ENCODED support to > fsstress and friends and send up the xfstests patches in [1]. > - btrfs_encoded_read() still doesn't implement repair. > > Changes from v2 [2]: > > - Rebase on v5.4-rc8 > - Add patch 1 introducing copy_struct_from_iter() as suggested by Aleksa > - Rename O_ENCODED to O_ALLOW_ENCODED as suggested by Amir > - Add arch-specific definitions of O_ALLOW_ENCODED for alpha, parisc, > and sparc > - Rework the VFS interface to be backward and forward compatible > - Document the VFS interface as requested by Dave > - Use __aligned_u64 for struct encoded_iov as noted by Aleksa > - Fix len/unencoded_len mixup in mm/filemap.c as noted by Nikolay > - Add support for writing inline and bookend extents to Btrfs > - Use ENOBUFS for "buffers not big enough for encoded extent" case and > E2BIG for "encoded_iov has unsupported fields" case > > Please share any comments on the API or implementation. Thanks! > > 1: https://github.com/osandov/xfstests/tree/rwf-encoded > 2: https://lore.kernel.org/linux-btrfs/cover.1571164762.git.osandov@xxxxxx/ > > Omar Sandoval (12): > iov_iter: add copy_struct_from_iter() > fs: add O_ALLOW_ENCODED open flag > fs: add RWF_ENCODED for reading/writing compressed data > btrfs: get rid of trivial __btrfs_lookup_bio_sums() wrappers > btrfs: don't advance offset for compressed bios in > btrfs_csum_one_bio() > btrfs: remove dead snapshot-aware defrag code > btrfs: make btrfs_ordered_extent naming consistent with > btrfs_file_extent_item > btrfs: add ram_bytes and offset to btrfs_ordered_extent > btrfs: support different disk extent size for delalloc > btrfs: optionally extend i_size in cow_file_range_inline() > btrfs: implement RWF_ENCODED reads > btrfs: implement RWF_ENCODED writes > > Documentation/filesystems/encoded_io.rst | 79 + > Documentation/filesystems/index.rst | 1 + > arch/alpha/include/uapi/asm/fcntl.h | 1 + > arch/parisc/include/uapi/asm/fcntl.h | 1 + > arch/sparc/include/uapi/asm/fcntl.h | 1 + > fs/btrfs/compression.c | 15 +- > fs/btrfs/compression.h | 5 +- > fs/btrfs/ctree.h | 13 +- > fs/btrfs/delalloc-space.c | 38 +- > fs/btrfs/delalloc-space.h | 4 +- > fs/btrfs/file-item.c | 54 +- > fs/btrfs/file.c | 61 +- > fs/btrfs/inode.c | 2463 +++++++++++----------- > fs/btrfs/ordered-data.c | 106 +- > fs/btrfs/ordered-data.h | 28 +- > fs/btrfs/relocation.c | 9 +- > fs/fcntl.c | 10 +- > fs/namei.c | 4 + > include/linux/fcntl.h | 2 +- > include/linux/fs.h | 16 + > include/linux/uio.h | 2 + > include/trace/events/btrfs.h | 6 +- > include/uapi/asm-generic/fcntl.h | 4 + > include/uapi/linux/fs.h | 33 +- > lib/iov_iter.c | 82 + > mm/filemap.c | 165 +- > 26 files changed, 1807 insertions(+), 1396 deletions(-) > create mode 100644 Documentation/filesystems/encoded_io.rst Ping. Al, would you mind taking a look at the generic bits/interface?
