Hi
I realized that the first patch of my patch series is missing, although
I successfully send them to the block mailing list. In addition to that,
I checked my mail server's log and I personally received a copy of my
patches. Also, I have not received any undelivered mail message from the
mailing list sever. So everything seems fine.
In preparation for submitting the patch series, I checked the size of
each patch. I can confirm that all patches are smaller than the 300kB
size limit stated in the documentation [1]. Did I do something wrong?
Regards,
Manuel
[1]
https://www.kernel.org/doc/html/v5.3-rc5/process/submitting-patches.html#e-mail-size
On 8/24/19 12:56 AM, developm...@manuel-bentele.de wrote:
From: Manuel Bentele <developm...@manuel-bentele.de>
Hi
Regarding to the following discussion [1] on the mailing list I show you
the result of my work as announced at the end of the discussion [2].
The discussion was about the project topic of how to implement the
reading/writing of QCOW2 in the kernel. The project focuses on an read-only
in-kernel QCOW2 implementation to increase the read/write performance
and tries to avoid nbd. Furthermore, the project is part of a project
series to develop a in-kernel network boot infrastructure that has no need
for any user space interaction (e.g. nbd) anymore.
During the discussion, it turned out that the implementation as device
mapper target is not applicable. The device mapper stacks different
functionality such as compression or encryption on multiple block device
layers whereas an implementation for the QCOW2 container format provides
these functionalities on one block device layer. Using FUSE is also not
possible due to performance reasons and user space interaction.
Therefore, I propose the extension of the loop device module. I created a
new file format subsystem which is part of the loop device module. The file
format subsystem abstracts the direct file access and provides an driver
API to implement various disk file formats such as QCOW2, VDI and VMDK.
File format drivers are implemented as kernel modules and can be registered
by the file format subsystem.
The patch series contains documentation for the file format subsystem and
the loop device module, too. Also, it provides a default RAW file format
driver and a read-only QCOW2 driver. The RAW file format driver is based on
the file specific parts of the existing loop device implementation and
preserves the default behaviour of a loop device. More specific information
can be found in the commit logs of the following patches.
Regards,
Manuel
[1] https://www.spinics.net/lists/linux-block/msg39538.html
[2] https://www.spinics.net/lists/linux-block/msg40479.html
Manuel Bentele (5):
block: loop: add file format subsystem for loop devices
doc: admin-guide: add loop block device documentation
doc: driver-api: add loop file format subsystem API documentation
block: loop: add QCOW2 loop file format driver (read-only)
doc: admin-guide: add QCOW2 file format to loop device documentation
Documentation/admin-guide/blockdev/index.rst | 1 +
Documentation/admin-guide/blockdev/loop.rst | 85 ++
Documentation/driver-api/index.rst | 1 +
Documentation/driver-api/loop-file-fmt.rst | 137 +++
arch/alpha/configs/defconfig | 1 +
arch/arc/configs/axs103_defconfig | 1 +
arch/arc/configs/axs103_smp_defconfig | 1 +
arch/arm/configs/am200epdkit_defconfig | 1 +
arch/arm/configs/aspeed_g4_defconfig | 1 +
arch/arm/configs/aspeed_g5_defconfig | 1 +
arch/arm/configs/assabet_defconfig | 1 +
arch/arm/configs/at91_dt_defconfig | 1 +
arch/arm/configs/axm55xx_defconfig | 1 +
arch/arm/configs/badge4_defconfig | 1 +
arch/arm/configs/cerfcube_defconfig | 1 +
arch/arm/configs/cm_x2xx_defconfig | 1 +
arch/arm/configs/cm_x300_defconfig | 1 +
arch/arm/configs/cns3420vb_defconfig | 1 +
arch/arm/configs/colibri_pxa270_defconfig | 1 +
arch/arm/configs/collie_defconfig | 1 +
arch/arm/configs/corgi_defconfig | 1 +
arch/arm/configs/davinci_all_defconfig | 1 +
arch/arm/configs/dove_defconfig | 1 +
arch/arm/configs/em_x270_defconfig | 1 +
arch/arm/configs/eseries_pxa_defconfig | 1 +
arch/arm/configs/exynos_defconfig | 1 +
arch/arm/configs/ezx_defconfig | 1 +
arch/arm/configs/footbridge_defconfig | 1 +
arch/arm/configs/h3600_defconfig | 1 +
arch/arm/configs/imote2_defconfig | 1 +
arch/arm/configs/imx_v6_v7_defconfig | 1 +
arch/arm/configs/integrator_defconfig | 1 +
arch/arm/configs/iop32x_defconfig | 1 +
arch/arm/configs/ixp4xx_defconfig | 1 +
arch/arm/configs/jornada720_defconfig | 1 +
arch/arm/configs/keystone_defconfig | 1 +
arch/arm/configs/lpc32xx_defconfig | 1 +
arch/arm/configs/milbeaut_m10v_defconfig | 1 +
arch/arm/configs/mini2440_defconfig | 1 +
arch/arm/configs/multi_v5_defconfig | 1 +
arch/arm/configs/multi_v7_defconfig | 1 +
arch/arm/configs/mv78xx0_defconfig | 1 +
arch/arm/configs/mvebu_v5_defconfig | 1 +
arch/arm/configs/netwinder_defconfig | 1 +
arch/arm/configs/nhk8815_defconfig | 1 +
arch/arm/configs/omap1_defconfig | 1 +
arch/arm/configs/omap2plus_defconfig | 1 +
arch/arm/configs/orion5x_defconfig | 1 +
arch/arm/configs/oxnas_v6_defconfig | 1 +
arch/arm/configs/palmz72_defconfig | 1 +
arch/arm/configs/pleb_defconfig | 1 +
arch/arm/configs/prima2_defconfig | 1 +
arch/arm/configs/pxa3xx_defconfig | 1 +
arch/arm/configs/pxa_defconfig | 1 +
arch/arm/configs/qcom_defconfig | 1 +
arch/arm/configs/rpc_defconfig | 1 +
arch/arm/configs/s3c2410_defconfig | 1 +
arch/arm/configs/s3c6400_defconfig | 1 +
arch/arm/configs/s5pv210_defconfig | 1 +
arch/arm/configs/sama5_defconfig | 1 +
arch/arm/configs/simpad_defconfig | 1 +
arch/arm/configs/socfpga_defconfig | 1 +
arch/arm/configs/spitz_defconfig | 1 +
arch/arm/configs/tango4_defconfig | 1 +
arch/arm/configs/tegra_defconfig | 1 +
arch/arm/configs/trizeps4_defconfig | 1 +
arch/arm/configs/viper_defconfig | 1 +
arch/arm/configs/zeus_defconfig | 1 +
arch/arm/configs/zx_defconfig | 1 +
arch/arm64/configs/defconfig | 1 +
arch/c6x/configs/dsk6455_defconfig | 1 +
arch/c6x/configs/evmc6457_defconfig | 1 +
arch/c6x/configs/evmc6472_defconfig | 1 +
arch/c6x/configs/evmc6474_defconfig | 1 +
arch/c6x/configs/evmc6678_defconfig | 1 +
arch/csky/configs/defconfig | 1 +
arch/hexagon/configs/comet_defconfig | 1 +
arch/ia64/configs/bigsur_defconfig | 1 +
arch/ia64/configs/generic_defconfig | 1 +
arch/ia64/configs/gensparse_defconfig | 1 +
arch/ia64/configs/tiger_defconfig | 1 +
arch/ia64/configs/zx1_defconfig | 1 +
arch/m68k/configs/amiga_defconfig | 1 +
arch/m68k/configs/apollo_defconfig | 1 +
arch/m68k/configs/atari_defconfig | 1 +
arch/m68k/configs/bvme6000_defconfig | 1 +
arch/m68k/configs/hp300_defconfig | 1 +
arch/m68k/configs/mac_defconfig | 1 +
arch/m68k/configs/multi_defconfig | 1 +
arch/m68k/configs/mvme147_defconfig | 1 +
arch/m68k/configs/mvme16x_defconfig | 1 +
arch/m68k/configs/q40_defconfig | 1 +
arch/m68k/configs/sun3_defconfig | 1 +
arch/m68k/configs/sun3x_defconfig | 1 +
arch/mips/configs/bigsur_defconfig | 1 +
arch/mips/configs/cavium_octeon_defconfig | 1 +
arch/mips/configs/cobalt_defconfig | 1 +
arch/mips/configs/decstation_64_defconfig | 1 +
arch/mips/configs/decstation_defconfig | 1 +
arch/mips/configs/decstation_r4k_defconfig | 1 +
arch/mips/configs/fuloong2e_defconfig | 1 +
arch/mips/configs/generic/board-ocelot.config | 1 +
arch/mips/configs/gpr_defconfig | 1 +
arch/mips/configs/ip27_defconfig | 1 +
arch/mips/configs/ip32_defconfig | 1 +
arch/mips/configs/jazz_defconfig | 1 +
arch/mips/configs/lemote2f_defconfig | 1 +
arch/mips/configs/loongson1b_defconfig | 1 +
arch/mips/configs/loongson1c_defconfig | 1 +
arch/mips/configs/loongson3_defconfig | 1 +
arch/mips/configs/malta_defconfig | 1 +
arch/mips/configs/malta_kvm_defconfig | 1 +
arch/mips/configs/malta_kvm_guest_defconfig | 1 +
arch/mips/configs/malta_qemu_32r6_defconfig | 1 +
arch/mips/configs/maltaaprp_defconfig | 1 +
arch/mips/configs/maltasmvp_defconfig | 1 +
arch/mips/configs/maltasmvp_eva_defconfig | 1 +
arch/mips/configs/maltaup_defconfig | 1 +
arch/mips/configs/maltaup_xpa_defconfig | 1 +
arch/mips/configs/markeins_defconfig | 1 +
arch/mips/configs/mips_paravirt_defconfig | 1 +
arch/mips/configs/nlm_xlp_defconfig | 1 +
arch/mips/configs/nlm_xlr_defconfig | 1 +
arch/mips/configs/pic32mzda_defconfig | 1 +
arch/mips/configs/pistachio_defconfig | 1 +
arch/mips/configs/pnx8335_stb225_defconfig | 1 +
arch/mips/configs/rbtx49xx_defconfig | 1 +
arch/mips/configs/rm200_defconfig | 1 +
arch/mips/configs/tb0219_defconfig | 1 +
arch/mips/configs/tb0226_defconfig | 1 +
arch/mips/configs/tb0287_defconfig | 1 +
arch/nios2/configs/10m50_defconfig | 1 +
arch/nios2/configs/3c120_defconfig | 1 +
arch/parisc/configs/712_defconfig | 1 +
arch/parisc/configs/a500_defconfig | 1 +
arch/parisc/configs/b180_defconfig | 1 +
arch/parisc/configs/c3000_defconfig | 1 +
arch/parisc/configs/c8000_defconfig | 1 +
arch/parisc/configs/defconfig | 1 +
arch/parisc/configs/generic-32bit_defconfig | 1 +
arch/parisc/configs/generic-64bit_defconfig | 1 +
arch/powerpc/configs/40x/virtex_defconfig | 1 +
arch/powerpc/configs/44x/sam440ep_defconfig | 1 +
arch/powerpc/configs/44x/virtex5_defconfig | 1 +
arch/powerpc/configs/52xx/cm5200_defconfig | 1 +
arch/powerpc/configs/52xx/lite5200b_defconfig | 1 +
arch/powerpc/configs/52xx/motionpro_defconfig | 1 +
arch/powerpc/configs/52xx/tqm5200_defconfig | 1 +
arch/powerpc/configs/83xx/asp8347_defconfig | 1 +
.../configs/83xx/mpc8313_rdb_defconfig | 1 +
.../configs/83xx/mpc8315_rdb_defconfig | 1 +
.../configs/83xx/mpc832x_mds_defconfig | 1 +
.../configs/83xx/mpc832x_rdb_defconfig | 1 +
.../configs/83xx/mpc834x_itx_defconfig | 1 +
.../configs/83xx/mpc834x_itxgp_defconfig | 1 +
.../configs/83xx/mpc834x_mds_defconfig | 1 +
.../configs/83xx/mpc836x_mds_defconfig | 1 +
.../configs/83xx/mpc836x_rdk_defconfig | 1 +
.../configs/83xx/mpc837x_mds_defconfig | 1 +
.../configs/83xx/mpc837x_rdb_defconfig | 1 +
arch/powerpc/configs/85xx/ge_imp3a_defconfig | 1 +
arch/powerpc/configs/85xx/ksi8560_defconfig | 1 +
.../configs/85xx/mpc8540_ads_defconfig | 1 +
.../configs/85xx/mpc8560_ads_defconfig | 1 +
.../configs/85xx/mpc85xx_cds_defconfig | 1 +
arch/powerpc/configs/85xx/sbc8548_defconfig | 1 +
arch/powerpc/configs/85xx/socrates_defconfig | 1 +
arch/powerpc/configs/85xx/stx_gp3_defconfig | 1 +
arch/powerpc/configs/85xx/tqm8540_defconfig | 1 +
arch/powerpc/configs/85xx/tqm8541_defconfig | 1 +
arch/powerpc/configs/85xx/tqm8548_defconfig | 1 +
arch/powerpc/configs/85xx/tqm8555_defconfig | 1 +
arch/powerpc/configs/85xx/tqm8560_defconfig | 1 +
.../configs/85xx/xes_mpc85xx_defconfig | 1 +
arch/powerpc/configs/amigaone_defconfig | 1 +
arch/powerpc/configs/cell_defconfig | 1 +
arch/powerpc/configs/chrp32_defconfig | 1 +
arch/powerpc/configs/ep8248e_defconfig | 1 +
arch/powerpc/configs/fsl-emb-nonhw.config | 1 +
arch/powerpc/configs/g5_defconfig | 1 +
arch/powerpc/configs/gamecube_defconfig | 1 +
arch/powerpc/configs/holly_defconfig | 1 +
arch/powerpc/configs/linkstation_defconfig | 1 +
arch/powerpc/configs/mgcoge_defconfig | 1 +
arch/powerpc/configs/mpc5200_defconfig | 1 +
arch/powerpc/configs/mpc7448_hpc2_defconfig | 1 +
arch/powerpc/configs/mpc8272_ads_defconfig | 1 +
arch/powerpc/configs/mpc83xx_defconfig | 1 +
arch/powerpc/configs/mpc866_ads_defconfig | 1 +
arch/powerpc/configs/mvme5100_defconfig | 1 +
arch/powerpc/configs/pasemi_defconfig | 1 +
arch/powerpc/configs/pmac32_defconfig | 1 +
arch/powerpc/configs/powernv_defconfig | 1 +
arch/powerpc/configs/ppc64_defconfig | 1 +
arch/powerpc/configs/ppc64e_defconfig | 1 +
arch/powerpc/configs/ppc6xx_defconfig | 1 +
arch/powerpc/configs/pq2fads_defconfig | 1 +
arch/powerpc/configs/ps3_defconfig | 1 +
arch/powerpc/configs/pseries_defconfig | 1 +
arch/powerpc/configs/skiroot_defconfig | 1 +
arch/powerpc/configs/wii_defconfig | 1 +
arch/riscv/configs/defconfig | 1 +
arch/riscv/configs/rv32_defconfig | 1 +
arch/s390/configs/debug_defconfig | 1 +
arch/s390/configs/defconfig | 1 +
arch/sh/configs/cayman_defconfig | 1 +
arch/sh/configs/landisk_defconfig | 1 +
arch/sh/configs/lboxre2_defconfig | 1 +
arch/sh/configs/rsk7264_defconfig | 1 +
arch/sh/configs/sdk7780_defconfig | 1 +
arch/sh/configs/sdk7786_defconfig | 1 +
arch/sh/configs/se7206_defconfig | 1 +
arch/sh/configs/se7780_defconfig | 1 +
arch/sh/configs/sh03_defconfig | 1 +
arch/sh/configs/sh2007_defconfig | 1 +
arch/sh/configs/sh7785lcr_32bit_defconfig | 1 +
arch/sh/configs/shmin_defconfig | 1 +
arch/sh/configs/titan_defconfig | 1 +
arch/sparc/configs/sparc32_defconfig | 1 +
arch/sparc/configs/sparc64_defconfig | 1 +
arch/um/configs/i386_defconfig | 1 +
arch/um/configs/x86_64_defconfig | 1 +
arch/unicore32/configs/defconfig | 1 +
arch/x86/configs/i386_defconfig | 1 +
arch/x86/configs/x86_64_defconfig | 1 +
arch/xtensa/configs/audio_kc705_defconfig | 1 +
arch/xtensa/configs/cadence_csp_defconfig | 1 +
arch/xtensa/configs/generic_kc705_defconfig | 1 +
arch/xtensa/configs/nommu_kc705_defconfig | 1 +
arch/xtensa/configs/smp_lx200_defconfig | 1 +
arch/xtensa/configs/virt_defconfig | 1 +
drivers/block/Kconfig | 73 +-
drivers/block/Makefile | 4 +-
drivers/block/loop/Kconfig | 93 ++
drivers/block/loop/Makefile | 13 +
drivers/block/{ => loop}/cryptoloop.c | 2 +-
drivers/block/loop/loop_file_fmt.c | 328 ++++++
drivers/block/loop/loop_file_fmt.h | 351 +++++++
drivers/block/loop/loop_file_fmt_qcow_cache.c | 218 ++++
drivers/block/loop/loop_file_fmt_qcow_cache.h | 51 +
.../block/loop/loop_file_fmt_qcow_cluster.c | 270 +++++
.../block/loop/loop_file_fmt_qcow_cluster.h | 23 +
drivers/block/loop/loop_file_fmt_qcow_main.c | 945 ++++++++++++++++++
drivers/block/loop/loop_file_fmt_qcow_main.h | 417 ++++++++
drivers/block/loop/loop_file_fmt_raw.c | 449 +++++++++
drivers/block/{loop.c => loop/loop_main.c} | 567 ++++-------
drivers/block/{loop.h => loop/loop_main.h} | 14 +-
include/uapi/linux/loop.h | 14 +-
248 files changed, 3861 insertions(+), 422 deletions(-)
create mode 100644 Documentation/admin-guide/blockdev/loop.rst
create mode 100644 Documentation/driver-api/loop-file-fmt.rst
create mode 100644 drivers/block/loop/Kconfig
create mode 100644 drivers/block/loop/Makefile
rename drivers/block/{ => loop}/cryptoloop.c (99%)
create mode 100644 drivers/block/loop/loop_file_fmt.c
create mode 100644 drivers/block/loop/loop_file_fmt.h
create mode 100644 drivers/block/loop/loop_file_fmt_qcow_cache.c
create mode 100644 drivers/block/loop/loop_file_fmt_qcow_cache.h
create mode 100644 drivers/block/loop/loop_file_fmt_qcow_cluster.c
create mode 100644 drivers/block/loop/loop_file_fmt_qcow_cluster.h
create mode 100644 drivers/block/loop/loop_file_fmt_qcow_main.c
create mode 100644 drivers/block/loop/loop_file_fmt_qcow_main.h
create mode 100644 drivers/block/loop/loop_file_fmt_raw.c
rename drivers/block/{loop.c => loop/loop_main.c} (86%)
rename drivers/block/{loop.h => loop/loop_main.h} (92%)
