This is the combined patchset showing the additions in the
second half patchset, that will be presented after the first
half patchset is accepted.
Patches 1 to 45 (inclusive) are a new version (v18) of the
first half patchset and have their own cover letter whose
subject line is:
[PATCH v18 00/45] sg: add v4 interface
The idea behind releasing the combined patchset is so they can
be run through the kernel's code sanity checking mechanisms.
So expect some noise.
The additions in the second half patchset are more fully described
in: https://sg.danny.cz/sg/sg_v40.html which is mirrored at:
https://doug-gilbert.github.io/sg_v40.html
The following list is a summary of features in the second patchset:
- add (sg) file descriptor sharing; this is used by:
- request sharing
- multiple requests (mrq) use of SGV4_FLAG_DO_ON_OTHER flag
- add request sharing, mainly to expedite copying. READ bio
handed off to paired WRITE with no data to user space unless
requested. Also capable of using VERIFY(BytChk=1) instead of
the WRITE (what NVMe does in its Compare NVM command).
- extend the request sharing logic so SGV4_FLAG_KEEP_SHARE
will keep bio after a WRITE. This allows for a single
source, multiple destinations copy
- add an extensible SG_SET_GET_EXTENDED ioctl(2) that takes a
fixed size structure (96 byte).
- add multiple requests capability (mrq) in a single ioctl(SG_IO)
or ioctl(SG_IOSUBMIT) invocation. Can be combined with request
sharing.
- add a SGV4_FLAG_IMMED flag for ioctl(SG_IORECEIVE) or
ioctl(SG_IORECEIVE_V3) so they don't wait
- add logic for (block layer generated) tag handling and keep
existing pack_id (packet id) logic which plays a similar role
- add ioctl(SG_IOABORT) to abort an inflight command/request
using its pack-id or tag.
- add shared variable blocking (svb) method to the mrq. Assumes
it is doing copy-like request sharing. By default WRITEs are
unordered (wrt to each other). With SGV4_FLAG_ORDERED_WR flag
WRITEs are ordered as required for ZBC disks.
- add support to pass a fd generated by eventfd(2) to the driver
via an ioctl(2).
- use iopoll/hipri/blk_poll with mrq, especially svb.
- bump the driver version number to 4.0.47
Most of the above are _only_ implemented for the sg version 4
(i.e. based on struct sg_io_v4) interface.
Douglas Gilbert (83):
sg: move functions around
sg: remove typedefs, type+formatting cleanup
sg: sg_log and is_enabled
sg: rework sg_poll(), minor changes
sg: bitops in sg_device
sg: make open count an atomic
sg: move header to uapi section
sg: speed sg_poll and sg_get_num_waiting
sg: sg_allow_if_err_recovery and renames
sg: improve naming
sg: change rwlock to spinlock
sg: ioctl handling
sg: split sg_read
sg: sg_common_write add structure for arguments
sg: rework sg_vma_fault
sg: rework sg_mmap
sg: replace sg_allow_access
sg: rework scatter gather handling
sg: introduce request state machine
sg: sg_find_srp_by_id
sg: sg_fill_request_element
sg: printk change %p to %pK
sg: xarray for fds in device
sg: xarray for reqs in fd
sg: replace rq array with xarray
sg: sense buffer rework
sg: add sg v4 interface support
sg: rework debug info
sg: add 8 byte SCSI LUN to sg_scsi_id
sg: expand sg_comm_wr_t
sg: add sg_iosubmit_v3 and sg_ioreceive_v3 ioctls
sg: add some __must_hold macros
sg: move procfs objects to avoid forward decls
sg: protect multiple receivers
sg: first debugfs support
sg: rework mmap support
sg: defang allow_dio
sg: warn v3 write system call users
sg: add mmap_sz tracking
sg: remove rcv_done request state
sg: track lowest inactive and await indexes
sg: remove unit attention check for device changed
sg: no_dxfer: move to/from kernel buffers
sg: add blk_poll support
sg: bump version to 4.0.12
sg: add sg_ioabort ioctl
sg: add sg_set_get_extended ioctl
sg: sgat_elem_sz and sum_fd_dlens
sg: tag and more_async
sg: add fd sharing , change, unshare
sg: add shared requests
sg: add multiple request support
sg: rename some mrq variables
sg: unlikely likely
sg: mrq abort
sg: reduce atomic operations
sg: add excl_wait flag
sg: tweak sg_find_sfp_by_fd()
sg: add snap_dev flag and snapped in debugfs
sg: compress usercontext to uc
sg: optionally output sg_request.frq_bm flags
sg: work on sg_mrq_sanity()
sg: shared variable blocking
sg: device timestamp
sg: condition met is not an error
sg: split sg_setup_req
sg: finish after read-side request
sg: keep share and dout offset flags
sg: add dlen to sg_comm_wr_t
sg: make use of struct sg_mrq_hold
sg: add mmap IO option for mrq metadata
sg: add eventfd support
sg: table of error number explanations
sg: add ordered write flag
sg: expand source line length to 100 characters
sg: add no_attach_msg parameter
sg: add SGV4_FLAG_REC_ORDER
sg: max to read for mrq sg_ioreceive
sg: mrq: if uniform svb then re-use bio_s
sg: expand bvec usage; re-use bio_s
sg: blk_poll/hipri work for mrq
sg: pollable and non-pollable requests
sg: bump version to 4.0.47
drivers/scsi/sg.c | 10003 +++++++++++++++++++++++++++++++--------
include/scsi/sg.h | 273 +-
include/uapi/scsi/sg.h | 491 ++
3 files changed, 8440 insertions(+), 2327 deletions(-)
create mode 100644 include/uapi/scsi/sg.h
--
2.25.1
