From: Omar Sandoval <osandov@xxxxxx>
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. I have test cases
(including fsstress support) and example programs which I'll send up
[1].
The main use-case is Btrfs send/receive: currently, when sending data
from one compressed filesystem to another, the sending side decompresses
the data and the receiving side recompresses it before writing it out.
This is wasteful and can be avoided if we can just send and write
compressed extents. The patches implementing the send/receive support
will be sent shortly.
Patches 1-3 add the VFS support and UAPI. Patch 4 is a fix that this
series depends on; it can be merged independently. Patches 5-8 are Btrfs
prep patches. Patch 9 adds Btrfs encoded read support and patch 10 adds
Btrfs encoded write support.
These patches are based on Dave Sterba's Btrfs misc-next branch [2],
which is in turn currently based on v5.12-rc3.
Changes since v7 [3]:
- Rebased on current kdave/misc-next (v5.12-rc3).
Omar Sandoval (10):
iov_iter: add copy_struct_from_iter()
fs: add O_ALLOW_ENCODED open flag
fs: add RWF_ENCODED for reading/writing compressed data
btrfs: fix check_data_csum() error message for direct I/O
btrfs: don't advance offset for compressed bios in
btrfs_csum_one_bio()
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
1: https://github.com/osandov/xfstests/tree/rwf-encoded
2: https://github.com/kdave/btrfs-devel/tree/misc-next
3: https://lore.kernel.org/linux-btrfs/cover.1611346706.git.osandov@xxxxxx/
Documentation/filesystems/encoded_io.rst | 74 ++
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 | 12 +-
fs/btrfs/compression.h | 6 +-
fs/btrfs/ctree.h | 9 +-
fs/btrfs/delalloc-space.c | 18 +-
fs/btrfs/file-item.c | 35 +-
fs/btrfs/file.c | 46 +-
fs/btrfs/inode.c | 936 ++++++++++++++++++++---
fs/btrfs/ordered-data.c | 80 +-
fs/btrfs/ordered-data.h | 18 +-
fs/btrfs/relocation.c | 4 +-
fs/fcntl.c | 10 +-
fs/namei.c | 4 +
fs/read_write.c | 168 +++-
include/linux/encoded_io.h | 17 +
include/linux/fcntl.h | 2 +-
include/linux/fs.h | 13 +
include/linux/uio.h | 2 +
include/uapi/asm-generic/fcntl.h | 4 +
include/uapi/linux/encoded_io.h | 30 +
include/uapi/linux/fs.h | 5 +-
lib/iov_iter.c | 82 ++
26 files changed, 1378 insertions(+), 201 deletions(-)
create mode 100644 Documentation/filesystems/encoded_io.rst
create mode 100644 include/linux/encoded_io.h
create mode 100644 include/uapi/linux/encoded_io.h
--
2.30.2
