linux-imx/drivers/block/null_blk/main.c
Greg Kroah-Hartman ba4a8a450d This is the 6.6.55 stable release
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Merge 6.6.55 into android15-6.6-lts

Changes in 6.6.55
	static_call: Handle module init failure correctly in static_call_del_module()
	static_call: Replace pointless WARN_ON() in static_call_module_notify()
	jump_label: Simplify and clarify static_key_fast_inc_cpus_locked()
	jump_label: Fix static_key_slow_dec() yet again
	scsi: st: Fix input/output error on empty drive reset
	scsi: pm8001: Do not overwrite PCI queue mapping
	drm/amdgpu: Fix get each xcp macro
	mailbox: rockchip: fix a typo in module autoloading
	mailbox: bcm2835: Fix timeout during suspend mode
	ceph: remove the incorrect Fw reference check when dirtying pages
	ieee802154: Fix build error
	net: sparx5: Fix invalid timestamps
	net/mlx5: Fix error path in multi-packet WQE transmit
	net/mlx5: Added cond_resched() to crdump collection
	net/mlx5e: Fix NULL deref in mlx5e_tir_builder_alloc()
	net/mlx5e: Fix crash caused by calling __xfrm_state_delete() twice
	netfilter: uapi: NFTA_FLOWTABLE_HOOK is NLA_NESTED
	net: ieee802154: mcr20a: Use IRQF_NO_AUTOEN flag in request_irq()
	net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()
	selftests: netfilter: Fix nft_audit.sh for newer nft binaries
	netfilter: nf_tables: prevent nf_skb_duplicated corruption
	Bluetooth: MGMT: Fix possible crash on mgmt_index_removed
	Bluetooth: L2CAP: Fix uaf in l2cap_connect
	Bluetooth: btmrvl: Use IRQF_NO_AUTOEN flag in request_irq()
	net: Add netif_get_gro_max_size helper for GRO
	net: Fix gso_features_check to check for both dev->gso_{ipv4_,}max_size
	net: ethernet: lantiq_etop: fix memory disclosure
	net: fec: Restart PPS after link state change
	net: fec: Reload PTP registers after link-state change
	net: avoid potential underflow in qdisc_pkt_len_init() with UFO
	net: add more sanity checks to qdisc_pkt_len_init()
	net: stmmac: dwmac4: extend timeout for VLAN Tag register busy bit check
	ipv4: ip_gre: Fix drops of small packets in ipgre_xmit
	net: test for not too small csum_start in virtio_net_hdr_to_skb()
	ppp: do not assume bh is held in ppp_channel_bridge_input()
	iomap: constrain the file range passed to iomap_file_unshare
	dt-bindings: net: xlnx,axi-ethernet: Add missing reg minItems
	sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start
	i2c: xiic: improve error message when transfer fails to start
	i2c: xiic: Try re-initialization on bus busy timeout
	loop: don't set QUEUE_FLAG_NOMERGES
	Bluetooth: hci_sock: Fix not validating setsockopt user input
	media: usbtv: Remove useless locks in usbtv_video_free()
	Bluetooth: ISO: Fix not validating setsockopt user input
	Bluetooth: L2CAP: Fix not validating setsockopt user input
	ASoC: atmel: mchp-pdmc: Skip ALSA restoration if substream runtime is uninitialized
	ALSA: mixer_oss: Remove some incorrect kfree_const() usages
	ALSA: hda/realtek: Fix the push button function for the ALC257
	cifs: Remove intermediate object of failed create reparse call
	ALSA: hda/generic: Unconditionally prefer preferred_dacs pairs
	ASoC: imx-card: Set card.owner to avoid a warning calltrace if SND=m
	cifs: Fix buffer overflow when parsing NFS reparse points
	cifs: Do not convert delimiter when parsing NFS-style symlinks
	ALSA: gus: Fix some error handling paths related to get_bpos() usage
	ALSA: hda/conexant: Fix conflicting quirk for System76 Pangolin
	wifi: ath9k: fix possible integer overflow in ath9k_get_et_stats()
	wifi: rtw89: avoid to add interface to list twice when SER
	wifi: ath9k_htc: Use __skb_set_length() for resetting urb before resubmit
	crypto: x86/sha256 - Add parentheses around macros' single arguments
	crypto: octeontx - Fix authenc setkey
	crypto: octeontx2 - Fix authenc setkey
	ice: Adjust over allocation of memory in ice_sched_add_root_node() and ice_sched_add_node()
	wifi: iwlwifi: mvm: Fix a race in scan abort flow
	wifi: iwlwifi: mvm: drop wrong STA selection in TX
	wifi: cfg80211: Set correct chandef when starting CAC
	net/xen-netback: prevent UAF in xenvif_flush_hash()
	net: hisilicon: hip04: fix OF node leak in probe()
	net: hisilicon: hns_dsaf_mac: fix OF node leak in hns_mac_get_info()
	net: hisilicon: hns_mdio: fix OF node leak in probe()
	ACPI: PAD: fix crash in exit_round_robin()
	ACPICA: Fix memory leak if acpi_ps_get_next_namepath() fails
	ACPICA: Fix memory leak if acpi_ps_get_next_field() fails
	e1000e: avoid failing the system during pm_suspend
	wifi: mt76: mt7915: disable tx worker during tx BA session enable/disable
	net: sched: consistently use rcu_replace_pointer() in taprio_change()
	Bluetooth: btusb: Add Realtek RTL8852C support ID 0x0489:0xe122
	Bluetooth: btrtl: Set msft ext address filter quirk for RTL8852B
	ACPI: video: Add force_vendor quirk for Panasonic Toughbook CF-18
	ACPI: CPPC: Add support for setting EPP register in FFH
	blk_iocost: fix more out of bound shifts
	wifi: ath12k: fix array out-of-bound access in SoC stats
	wifi: ath11k: fix array out-of-bound access in SoC stats
	wifi: rtw88: select WANT_DEV_COREDUMP
	ACPI: EC: Do not release locks during operation region accesses
	ACPICA: check null return of ACPI_ALLOCATE_ZEROED() in acpi_db_convert_to_package()
	tipc: guard against string buffer overrun
	net: mvpp2: Increase size of queue_name buffer
	bnxt_en: Extend maximum length of version string by 1 byte
	ipv4: Check !in_dev earlier for ioctl(SIOCSIFADDR).
	wifi: rtw89: correct base HT rate mask for firmware
	ipv4: Mask upper DSCP bits and ECN bits in NETLINK_FIB_LOOKUP family
	net: atlantic: Avoid warning about potential string truncation
	crypto: simd - Do not call crypto_alloc_tfm during registration
	netpoll: Ensure clean state on setup failures
	tcp: avoid reusing FIN_WAIT2 when trying to find port in connect() process
	wifi: iwlwifi: mvm: use correct key iteration
	wifi: iwlwifi: mvm: avoid NULL pointer dereference
	wifi: mac80211: fix RCU list iterations
	ACPICA: iasl: handle empty connection_node
	proc: add config & param to block forcing mem writes
	drivers/perf: arm_spe: Use perf_allow_kernel() for permissions
	can: netlink: avoid call to do_set_data_bittiming callback with stale can_priv::ctrlmode
	wifi: mt76: mt7915: add dummy HW offload of IEEE 802.11 fragmentation
	wifi: mt76: mt7915: hold dev->mt76.mutex while disabling tx worker
	wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext()
	nfp: Use IRQF_NO_AUTOEN flag in request_irq()
	ALSA: usb-audio: Add input value sanity checks for standard types
	x86/ioapic: Handle allocation failures gracefully
	ALSA: usb-audio: Define macros for quirk table entries
	ALSA: usb-audio: Replace complex quirk lines with macros
	ALSA: usb-audio: Add logitech Audio profile quirk
	ASoC: codecs: wsa883x: Handle reading version failure
	tools/x86/kcpuid: Protect against faulty "max subleaf" values
	x86/pkeys: Add PKRU as a parameter in signal handling functions
	x86/pkeys: Restore altstack access in sigreturn()
	x86/kexec: Add EFI config table identity mapping for kexec kernel
	ALSA: asihpi: Fix potential OOB array access
	ALSA: hdsp: Break infinite MIDI input flush loop
	tools/nolibc: powerpc: limit stack-protector workaround to GCC
	selftests/nolibc: avoid passing NULL to printf("%s")
	x86/syscall: Avoid memcpy() for ia32 syscall_get_arguments()
	hwmon: (nct6775) add G15CF to ASUS WMI monitoring list
	fbdev: efifb: Register sysfs groups through driver core
	fbdev: pxafb: Fix possible use after free in pxafb_task()
	rcuscale: Provide clear error when async specified without primitives
	power: reset: brcmstb: Do not go into infinite loop if reset fails
	iommu/vt-d: Always reserve a domain ID for identity setup
	iommu/vt-d: Fix potential lockup if qi_submit_sync called with 0 count
	drm/stm: Avoid use-after-free issues with crtc and plane
	drm/amdgpu: disallow multiple BO_HANDLES chunks in one submit
	drm/amdkfd: amdkfd_free_gtt_mem clear the correct pointer
	drm/amd/display: Add null check for top_pipe_to_program in commit_planes_for_stream
	ata: pata_serverworks: Do not use the term blacklist
	ata: sata_sil: Rename sil_blacklist to sil_quirks
	HID: Ignore battery for all ELAN I2C-HID devices
	drm/amd/display: Handle null 'stream_status' in 'planes_changed_for_existing_stream'
	drm/amd/display: Check null pointers before using dc->clk_mgr
	drm/amd/display: Add null check for 'afb' in amdgpu_dm_plane_handle_cursor_update (v2)
	drm/amd/display: fix double free issue during amdgpu module unload
	jfs: UBSAN: shift-out-of-bounds in dbFindBits
	jfs: Fix uaf in dbFreeBits
	jfs: check if leafidx greater than num leaves per dmap tree
	scsi: smartpqi: correct stream detection
	drm/msm/adreno: Assign msm_gpu->pdev earlier to avoid nullptrs
	jfs: Fix uninit-value access of new_ea in ea_buffer
	drm/amdgpu: add raven1 gfxoff quirk
	drm/amdgpu: enable gfxoff quirk on HP 705G4
	drm/amdkfd: Fix resource leak in criu restore queue
	HID: multitouch: Add support for Thinkpad X12 Gen 2 Kbd Portfolio
	platform/x86: touchscreen_dmi: add nanote-next quirk
	drm/stm: ltdc: reset plane transparency after plane disable
	drm/amd/display: Check stream before comparing them
	drm/amd/display: Check link_res->hpo_dp_link_enc before using it
	drm/amd/display: Fix index out of bounds in DCN30 degamma hardware format translation
	drm/amd/display: Fix index out of bounds in degamma hardware format translation
	drm/amd/display: Fix index out of bounds in DCN30 color transformation
	drm/amd/display: Avoid overflow assignment in link_dp_cts
	drm/amd/display: Initialize get_bytes_per_element's default to 1
	drm/printer: Allow NULL data in devcoredump printer
	perf,x86: avoid missing caller address in stack traces captured in uprobe
	scsi: aacraid: Rearrange order of struct aac_srb_unit
	scsi: lpfc: Update PRLO handling in direct attached topology
	drm/amdgpu: fix unchecked return value warning for amdgpu_gfx
	perf: Fix event_function_call() locking
	scsi: NCR5380: Initialize buffer for MSG IN and STATUS transfers
	drm/radeon/r100: Handle unknown family in r100_cp_init_microcode()
	drm/amdgpu: Block MMR_READ IOCTL in reset
	drm/amdgpu/gfx9: use rlc safe mode for soft recovery
	drm/amd/pm: ensure the fw_info is not null before using it
	of/irq: Refer to actual buffer size in of_irq_parse_one()
	powerpc/pseries: Use correct data types from pseries_hp_errorlog struct
	drm/amdgpu/gfx11: use rlc safe mode for soft recovery
	drm/amdgpu/gfx10: use rlc safe mode for soft recovery
	platform/x86: lenovo-ymc: Ignore the 0x0 state
	ksmbd: add refcnt to ksmbd_conn struct
	bpf: Make the pointer returned by iter next method valid
	ext4: ext4_search_dir should return a proper error
	ext4: avoid use-after-free in ext4_ext_show_leaf()
	ext4: fix i_data_sem unlock order in ext4_ind_migrate()
	bpftool: Fix undefined behavior caused by shifting into the sign bit
	iomap: handle a post-direct I/O invalidate race in iomap_write_delalloc_release
	bpftool: Fix undefined behavior in qsort(NULL, 0, ...)
	spi: spi-imx: Fix pm_runtime_set_suspended() with runtime pm enabled
	spi: spi-cadence: Use helper function devm_clk_get_enabled()
	spi: spi-cadence: Fix pm_runtime_set_suspended() with runtime pm enabled
	spi: spi-cadence: Fix missing spi_controller_is_target() check
	selftest: hid: add missing run-hid-tools-tests.sh
	spi: s3c64xx: fix timeout counters in flush_fifo
	selftests: breakpoints: use remaining time to check if suspend succeed
	accel/ivpu: Add missing MODULE_FIRMWARE metadata
	spi: rpc-if: Add missing MODULE_DEVICE_TABLE
	perf callchain: Fix stitch LBR memory leaks
	perf: Really fix event_function_call() locking
	selftests: vDSO: fix vDSO name for powerpc
	selftests: vDSO: fix vdso_config for powerpc
	selftests: vDSO: fix vDSO symbols lookup for powerpc64
	selftests/mm: fix charge_reserved_hugetlb.sh test
	powerpc/vdso: Fix VDSO data access when running in a non-root time namespace
	selftests: vDSO: fix ELF hash table entry size for s390x
	selftests: vDSO: fix vdso_config for s390
	Revert "ALSA: hda: Conditionally use snooping for AMD HDMI"
	platform/x86: ISST: Fix the KASAN report slab-out-of-bounds bug
	i2c: stm32f7: Do not prepare/unprepare clock during runtime suspend/resume
	i2c: qcom-geni: Use IRQF_NO_AUTOEN flag in request_irq()
	i2c: xiic: Wait for TX empty to avoid missed TX NAKs
	media: i2c: ar0521: Use cansleep version of gpiod_set_value()
	i2c: xiic: Fix pm_runtime_set_suspended() with runtime pm enabled
	i2c: designware: fix controller is holding SCL low while ENABLE bit is disabled
	rust: sync: require `T: Sync` for `LockedBy::access`
	ovl: fail if trusted xattrs are needed but caller lacks permission
	firmware: tegra: bpmp: Drop unused mbox_client_to_bpmp()
	memory: tegra186-emc: drop unused to_tegra186_emc()
	dt-bindings: clock: exynos7885: Fix duplicated binding
	spi: bcm63xx: Fix module autoloading
	spi: bcm63xx: Fix missing pm_runtime_disable()
	power: supply: hwmon: Fix missing temp1_max_alarm attribute
	perf/core: Fix small negative period being ignored
	parisc: Fix itlb miss handler for 64-bit programs
	drm/mediatek: ovl_adaptor: Add missing of_node_put()
	drm: Consistently use struct drm_mode_rect for FB_DAMAGE_CLIPS
	ALSA: hda/tas2781: Add new quirk for Lenovo Y990 Laptop
	ALSA: core: add isascii() check to card ID generator
	ALSA: usb-audio: Add delay quirk for VIVO USB-C HEADSET
	ALSA: usb-audio: Add native DSD support for Luxman D-08u
	ALSA: line6: add hw monitor volume control to POD HD500X
	ALSA: hda/realtek: Add quirk for Huawei MateBook 13 KLV-WX9
	ALSA: hda/realtek: Add a quirk for HP Pavilion 15z-ec200
	ext4: no need to continue when the number of entries is 1
	ext4: correct encrypted dentry name hash when not casefolded
	ext4: fix slab-use-after-free in ext4_split_extent_at()
	ext4: propagate errors from ext4_find_extent() in ext4_insert_range()
	ext4: fix incorrect tid assumption in ext4_fc_mark_ineligible()
	ext4: dax: fix overflowing extents beyond inode size when partially writing
	ext4: fix incorrect tid assumption in __jbd2_log_wait_for_space()
	ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free
	ext4: aovid use-after-free in ext4_ext_insert_extent()
	ext4: fix double brelse() the buffer of the extents path
	ext4: fix timer use-after-free on failed mount
	ext4: update orig_path in ext4_find_extent()
	ext4: fix incorrect tid assumption in ext4_wait_for_tail_page_commit()
	ext4: fix incorrect tid assumption in jbd2_journal_shrink_checkpoint_list()
	ext4: fix fast commit inode enqueueing during a full journal commit
	ext4: use handle to mark fc as ineligible in __track_dentry_update()
	ext4: mark fc as ineligible using an handle in ext4_xattr_set()
	parisc: Fix 64-bit userspace syscall path
	parisc: Allow mmap(MAP_STACK) memory to automatically expand upwards
	parisc: Fix stack start for ADDR_NO_RANDOMIZE personality
	drm/rockchip: vop: clear DMA stop bit on RK3066
	of: address: Report error on resource bounds overflow
	of/irq: Support #msi-cells=<0> in of_msi_get_domain
	drm: omapdrm: Add missing check for alloc_ordered_workqueue
	resource: fix region_intersects() vs add_memory_driver_managed()
	jbd2: stop waiting for space when jbd2_cleanup_journal_tail() returns error
	jbd2: correctly compare tids with tid_geq function in jbd2_fc_begin_commit
	mm: krealloc: consider spare memory for __GFP_ZERO
	ocfs2: fix the la space leak when unmounting an ocfs2 volume
	ocfs2: fix uninit-value in ocfs2_get_block()
	ocfs2: reserve space for inline xattr before attaching reflink tree
	ocfs2: cancel dqi_sync_work before freeing oinfo
	ocfs2: remove unreasonable unlock in ocfs2_read_blocks
	ocfs2: fix null-ptr-deref when journal load failed.
	ocfs2: fix possible null-ptr-deref in ocfs2_set_buffer_uptodate
	arm64: fix selection of HAVE_DYNAMIC_FTRACE_WITH_ARGS
	arm64: Subscribe Microsoft Azure Cobalt 100 to erratum 3194386
	riscv: define ILLEGAL_POINTER_VALUE for 64bit
	exfat: fix memory leak in exfat_load_bitmap()
	perf python: Disable -Wno-cast-function-type-mismatch if present on clang
	perf hist: Update hist symbol when updating maps
	nfsd: fix delegation_blocked() to block correctly for at least 30 seconds
	nfsd: map the EBADMSG to nfserr_io to avoid warning
	NFSD: Fix NFSv4's PUTPUBFH operation
	i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition
	RDMA/mana_ib: use the correct page size for mapping user-mode doorbell page
	riscv: Fix kernel stack size when KASAN is enabled
	aoe: fix the potential use-after-free problem in more places
	media: ov5675: Fix power on/off delay timings
	clk: rockchip: fix error for unknown clocks
	remoteproc: k3-r5: Fix error handling when power-up failed
	clk: qcom: dispcc-sm8250: use CLK_SET_RATE_PARENT for branch clocks
	media: sun4i_csi: Implement link validate for sun4i_csi subdev
	clk: qcom: gcc-sm8450: Do not turn off PCIe GDSCs during gdsc_disable()
	media: uapi/linux/cec.h: cec_msg_set_reply_to: zero flags
	clk: qcom: clk-rpmh: Fix overflow in BCM vote
	clk: samsung: exynos7885: Update CLKS_NR_FSYS after bindings fix
	clk: qcom: gcc-sm8150: De-register gcc_cpuss_ahb_clk_src
	media: venus: fix use after free bug in venus_remove due to race condition
	clk: qcom: gcc-sm8250: Do not turn off PCIe GDSCs during gdsc_disable()
	media: qcom: camss: Remove use_count guard in stop_streaming
	media: qcom: camss: Fix ordering of pm_runtime_enable
	clk: qcom: gcc-sc8180x: Fix the sdcc2 and sdcc4 clocks freq table
	clk: qcom: clk-alpha-pll: Fix CAL_L_VAL override for LUCID EVO PLL
	smb: client: use actual path when queryfs
	smb3: fix incorrect mode displayed for read-only files
	iio: magnetometer: ak8975: Fix reading for ak099xx sensors
	vrf: revert "vrf: Remove unnecessary RCU-bh critical section"
	gso: fix udp gso fraglist segmentation after pull from frag_list
	tomoyo: fallback to realpath if symlink's pathname does not exist
	net: stmmac: Fix zero-division error when disabling tc cbs
	rtc: at91sam9: fix OF node leak in probe() error path
	Input: adp5589-keys - fix NULL pointer dereference
	Input: adp5589-keys - fix adp5589_gpio_get_value()
	cachefiles: fix dentry leak in cachefiles_open_file()
	ACPI: resource: Add Asus Vivobook X1704VAP to irq1_level_low_skip_override[]
	ACPI: resource: Add Asus ExpertBook B2502CVA to irq1_level_low_skip_override[]
	btrfs: fix a NULL pointer dereference when failed to start a new trasacntion
	btrfs: send: fix invalid clone operation for file that got its size decreased
	btrfs: wait for fixup workers before stopping cleaner kthread during umount
	cpufreq: Avoid a bad reference count on CPU node
	gpio: davinci: fix lazy disable
	net: pcs: xpcs: fix the wrong register that was written back
	Bluetooth: hci_event: Align BR/EDR JUST_WORKS paring with LE
	mac802154: Fix potential RCU dereference issue in mac802154_scan_worker
	ceph: fix cap ref leak via netfs init_request
	tracing/hwlat: Fix a race during cpuhp processing
	tracing/timerlat: Drop interface_lock in stop_kthread()
	tracing/timerlat: Fix a race during cpuhp processing
	tracing/timerlat: Fix duplicated kthread creation due to CPU online/offline
	rtla: Fix the help text in osnoise and timerlat top tools
	close_range(): fix the logics in descriptor table trimming
	drm/i915/gem: fix bitwise and logical AND mixup
	drm/sched: Add locking to drm_sched_entity_modify_sched
	drm/amd/display: Add HDR workaround for specific eDP
	drm/amd/display: Fix system hang while resume with TBT monitor
	cpufreq: intel_pstate: Make hwp_notify_lock a raw spinlock
	kconfig: qconf: fix buffer overflow in debug links
	platform/x86: x86-android-tablets: Create a platform_device from module_init()
	platform/x86: x86-android-tablets: Fix use after free on platform_device_register() errors
	i2c: create debugfs entry per adapter
	i2c: core: Lock address during client device instantiation
	i2c: synquacer: Remove a clk reference from struct synquacer_i2c
	i2c: synquacer: Deal with optional PCLK correctly
	arm64: cputype: Add Neoverse-N3 definitions
	arm64: errata: Expand speculative SSBS workaround once more
	io_uring/net: harden multishot termination case for recv
	uprobes: fix kernel info leak via "[uprobes]" vma
	mm: z3fold: deprecate CONFIG_Z3FOLD
	drm/amd/display: Allow backlight to go below `AMDGPU_DM_DEFAULT_MIN_BACKLIGHT`
	build-id: require program headers to be right after ELF header
	lib/buildid: harden build ID parsing logic
	sched: psi: fix bogus pressure spikes from aggregation race
	net: mana: Enable MANA driver on ARM64 with 4K page size
	net: mana: Add support for page sizes other than 4KB on ARM64
	RDMA/mana_ib: use the correct page table index based on hardware page size
	media: i2c: imx335: Enable regulator supplies
	media: imx335: Fix reset-gpio handling
	remoteproc: k3-r5: Acquire mailbox handle during probe routine
	remoteproc: k3-r5: Delay notification of wakeup event
	dt-bindings: clock: qcom: Add missing UFS QREF clocks
	dt-bindings: clock: qcom: Add GPLL9 support on gcc-sc8180x
	iio: pressure: bmp280: Allow multiple chips id per family of devices
	iio: pressure: bmp280: Improve indentation and line wrapping
	iio: pressure: bmp280: Use BME prefix for BME280 specifics
	iio: pressure: bmp280: Fix regmap for BMP280 device
	iio: pressure: bmp280: Fix waiting time for BMP3xx configuration
	r8169: Fix spelling mistake: "tx_underun" -> "tx_underrun"
	r8169: add tally counter fields added with RTL8125
	clk: qcom: gcc-sc8180x: Add GPLL9 support
	ACPI: battery: Simplify battery hook locking
	ACPI: battery: Fix possible crash when unregistering a battery hook
	btrfs: relocation: return bool from btrfs_should_ignore_reloc_root
	btrfs: relocation: constify parameters where possible
	btrfs: drop the backref cache during relocation if we commit
	drm/rockchip: vop: enable VOP_FEATURE_INTERNAL_RGB on RK3066
	Revert "drm/amd/display: Skip Recompute DSC Params if no Stream on Link"
	ubifs: ubifs_symlink: Fix memleak of inode->i_link in error path
	netfilter: nf_tables: fix memleak in map from abort path
	netfilter: nf_tables: restore set elements when delete set fails
	net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events
	iommufd: Fix protection fault in iommufd_test_syz_conv_iova
	drm/bridge: adv7511: fix crash on irq during probe
	efi/unaccepted: touch soft lockup during memory accept
	platform/x86: think-lmi: Fix password opcode ordering for workstations
	null_blk: Remove usage of the deprecated ida_simple_xx() API
	null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues'
	net: stmmac: move the EST lock to struct stmmac_priv
	rxrpc: Fix a race between socket set up and I/O thread creation
	vhost/scsi: null-ptr-dereference in vhost_scsi_get_req()
	crypto: octeontx* - Select CRYPTO_AUTHENC
	drm/amd/display: Revert Avoid overflow assignment
	perf report: Fix segfault when 'sym' sort key is not used
	drm/amd/display: enable_hpo_dp_link_output: Check link_res->hpo_dp_link_enc before using it
	null_blk: Fix return value of nullb_device_power_store()
	Revert "ubifs: ubifs_symlink: Fix memleak of inode->i_link in error path"
	perf python: Allow checking for the existence of warning options in clang
	Linux 6.6.55

Applicable to GKI build:
  33f3e83227 jump_label: Simplify and clarify static_key_fast_inc_cpus_locked() [1 file, +11/-9]
  86fdd18064 jump_label: Fix static_key_slow_dec() yet again [1 file, +27/-7]
  8691a82abf netfilter: uapi: NFTA_FLOWTABLE_HOOK is NLA_NESTED [1 file, +1/-1]
  4e3542f40f netfilter: nf_tables: prevent nf_skb_duplicated corruption [2 files, +10/-4]
  4883296505 Bluetooth: MGMT: Fix possible crash on mgmt_index_removed [1 file, +14/-9]
  b90907696c Bluetooth: L2CAP: Fix uaf in l2cap_connect [3 files, +3/-9]
  dae9b99bd2 net: Add netif_get_gro_max_size helper for GRO [2 files, +11/-7]
  718b663403 net: Fix gso_features_check to check for both dev->gso_{ipv4_,}max_size [2 files, +10/-1]
  25ab0b87db net: avoid potential underflow in qdisc_pkt_len_init() with UFO [1 file, +1/-1]
  9b0ee571d2 net: add more sanity checks to qdisc_pkt_len_init() [1 file, +7/-3]
  ea8cad4ca5 ipv4: ip_gre: Fix drops of small packets in ipgre_xmit [1 file, +3/-3]
  d9dfd41e32 net: test for not too small csum_start in virtio_net_hdr_to_skb() [1 file, +3/-1]
  f9620e2a66 ppp: do not assume bh is held in ppp_channel_bridge_input() [1 file, +2/-2]
  b66ff9a3fc loop: don't set QUEUE_FLAG_NOMERGES [1 file, +2/-13]
  0c18a64039 Bluetooth: hci_sock: Fix not validating setsockopt user input [1 file, +8/-13]
  6a6baa1ee7 Bluetooth: ISO: Fix not validating setsockopt user input [1 file, +12/-24]
  28234f8ab6 Bluetooth: L2CAP: Fix not validating setsockopt user input [1 file, +20/-32]
  1ab2cfe197 blk_iocost: fix more out of bound shifts [1 file, +5/-3]
  12d26aa7fd tipc: guard against string buffer overrun [1 file, +6/-2]
  d4c4653b60 ipv4: Check !in_dev earlier for ioctl(SIOCSIFADDR). [1 file, +2/-4]
  f989162f55 ipv4: Mask upper DSCP bits and ECN bits in NETLINK_FIB_LOOKUP family [1 file, +1/-1]
  5cce1c07bf tcp: avoid reusing FIN_WAIT2 when trying to find port in connect() process [1 file, +3/-0]
  b4f8240bc3 can: netlink: avoid call to do_set_data_bittiming callback with stale can_priv::ctrlmode [1 file, +51/-51]
  864f68a242 ALSA: usb-audio: Add input value sanity checks for standard types [2 files, +28/-8]
  70d5e30b0a ALSA: usb-audio: Add logitech Audio profile quirk [1 file, +6/-0]
  4ee08b4a72 drm/printer: Allow NULL data in devcoredump printer [2 files, +61/-6]
  66a403d89b perf: Fix event_function_call() locking [1 file, +5/-4]
  fe2c86e192 of/irq: Refer to actual buffer size in of_irq_parse_one() [1 file, +2/-2]
  b111ae42bb bpf: Make the pointer returned by iter next method valid [1 file, +22/-4]
  1fe2852720 ext4: ext4_search_dir should return a proper error [1 file, +7/-5]
  34b2096380 ext4: avoid use-after-free in ext4_ext_show_leaf() [1 file, +4/-5]
  d43776b907 ext4: fix i_data_sem unlock order in ext4_ind_migrate() [1 file, +1/-1]
  390b9e54cd iomap: handle a post-direct I/O invalidate race in iomap_write_delalloc_release [1 file, +9/-1]
  9629c0c3e8 perf: Really fix event_function_call() locking [1 file, +8/-5]
  bf47be5479 ovl: fail if trusted xattrs are needed but caller lacks permission [1 file, +33/-5]
  028258156f firmware: tegra: bpmp: Drop unused mbox_client_to_bpmp() [1 file, +0/-6]
  ff580d0130 memory: tegra186-emc: drop unused to_tegra186_emc() [1 file, +0/-5]
  9fca08c06a perf/core: Fix small negative period being ignored [1 file, +5/-1]
  c923bc8746 drm: Consistently use struct drm_mode_rect for FB_DAMAGE_CLIPS [1 file, +1/-1]
  aba1be9a80 ALSA: core: add isascii() check to card ID generator [1 file, +10/-4]
  9d125aab4c ALSA: usb-audio: Add delay quirk for VIVO USB-C HEADSET [1 file, +2/-0]
  228a8b952c ALSA: usb-audio: Add native DSD support for Luxman D-08u [1 file, +2/-0]
  2d64e7dada ext4: no need to continue when the number of entries is 1 [1 file, +1/-1]
  a56e5f389d ext4: correct encrypted dentry name hash when not casefolded [1 file, +11/-3]
  8fe117790b ext4: fix slab-use-after-free in ext4_split_extent_at() [1 file, +20/-1]
  f4308d8ee3 ext4: propagate errors from ext4_find_extent() in ext4_insert_range() [1 file, +1/-0]
  8c762b4e19 ext4: fix incorrect tid assumption in ext4_fc_mark_ineligible() [1 file, +11/-4]
  5efccdee4a ext4: dax: fix overflowing extents beyond inode size when partially writing [1 file, +4/-4]
  93051d16b3 ext4: fix incorrect tid assumption in __jbd2_log_wait_for_space() [1 file, +5/-2]
  1b558006d9 ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free [1 file, +10/-11]
  8162ee5d94 ext4: aovid use-after-free in ext4_ext_insert_extent() [1 file, +1/-0]
  68a69cf606 ext4: fix double brelse() the buffer of the extents path [1 file, +1/-0]
  9203817ba4 ext4: fix timer use-after-free on failed mount [1 file, +1/-1]
  f55ecc58d0 ext4: update orig_path in ext4_find_extent() [2 files, +2/-2]
  80dccb81b7 ext4: fix incorrect tid assumption in ext4_wait_for_tail_page_commit() [1 file, +7/-4]
  1552199ace ext4: fix incorrect tid assumption in jbd2_journal_shrink_checkpoint_list() [1 file, +5/-2]
  d13a3558e8 ext4: fix fast commit inode enqueueing during a full journal commit [2 files, +15/-2]
  c5771f1c48 ext4: use handle to mark fc as ineligible in __track_dentry_update() [1 file, +11/-8]
  89bbc55d6b ext4: mark fc as ineligible using an handle in ext4_xattr_set() [1 file, +2/-1]
  a17dfde577 parisc: Fix stack start for ADDR_NO_RANDOMIZE personality [1 file, +2/-1]
  d657d28641 of: address: Report error on resource bounds overflow [1 file, +5/-0]
  0022085f11 of/irq: Support #msi-cells=<0> in of_msi_get_domain [1 file, +7/-27]
  393331e16c resource: fix region_intersects() vs add_memory_driver_managed() [1 file, +50/-8]
  1c62dc0d82 jbd2: stop waiting for space when jbd2_cleanup_journal_tail() returns error [1 file, +5/-2]
  fd34962434 jbd2: correctly compare tids with tid_geq function in jbd2_fc_begin_commit [1 file, +1/-1]
  e3a9fc1520 mm: krealloc: consider spare memory for __GFP_ZERO [1 file, +7/-0]
  bf0b3b3525 exfat: fix memory leak in exfat_load_bitmap() [1 file, +5/-5]
  af3122f5fd gso: fix udp gso fraglist segmentation after pull from frag_list [1 file, +20/-2]
  0f41f383b5 cpufreq: Avoid a bad reference count on CPU node [1 file, +1/-5]
  830c03e58b Bluetooth: hci_event: Align BR/EDR JUST_WORKS paring with LE [1 file, +5/-8]
  e676e4ea76 mac802154: Fix potential RCU dereference issue in mac802154_scan_worker [1 file, +3/-1]
  a8023f8b55 close_range(): fix the logics in descriptor table trimming [3 files, +52/-83]
  4a2be5a728 i2c: create debugfs entry per adapter [2 files, +13/-0]
  316be4911f i2c: core: Lock address during client device instantiation [2 files, +31/-0]
  9a3e9aab60 arm64: cputype: Add Neoverse-N3 definitions [1 file, +2/-0]
  24f7989ed2 io_uring/net: harden multishot termination case for recv [1 file, +3/-1]
  5b981d8335 uprobes: fix kernel info leak via "[uprobes]" vma [1 file, +1/-1]
  f941d77962 build-id: require program headers to be right after ELF header [1 file, +14/-0]
  c83a80d8b8 lib/buildid: harden build ID parsing logic [1 file, +44/-32]
GKI (arm64) relevant 79 out of 385 changes, affecting 92 files +798/-486

Change-Id: I44c3665935ccd89562de4f0c904061025569e953
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
2024-10-10 12:10:42 +00:00

2391 lines
59 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and
* Shaohua Li <shli@fb.com>
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/init.h>
#include "null_blk.h"
#undef pr_fmt
#define pr_fmt(fmt) "null_blk: " fmt
#define FREE_BATCH 16
#define TICKS_PER_SEC 50ULL
#define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC)
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
static DECLARE_FAULT_ATTR(null_timeout_attr);
static DECLARE_FAULT_ATTR(null_requeue_attr);
static DECLARE_FAULT_ATTR(null_init_hctx_attr);
#endif
static inline u64 mb_per_tick(int mbps)
{
return (1 << 20) / TICKS_PER_SEC * ((u64) mbps);
}
/*
* Status flags for nullb_device.
*
* CONFIGURED: Device has been configured and turned on. Cannot reconfigure.
* UP: Device is currently on and visible in userspace.
* THROTTLED: Device is being throttled.
* CACHE: Device is using a write-back cache.
*/
enum nullb_device_flags {
NULLB_DEV_FL_CONFIGURED = 0,
NULLB_DEV_FL_UP = 1,
NULLB_DEV_FL_THROTTLED = 2,
NULLB_DEV_FL_CACHE = 3,
};
#define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2)
/*
* nullb_page is a page in memory for nullb devices.
*
* @page: The page holding the data.
* @bitmap: The bitmap represents which sector in the page has data.
* Each bit represents one block size. For example, sector 8
* will use the 7th bit
* The highest 2 bits of bitmap are for special purpose. LOCK means the cache
* page is being flushing to storage. FREE means the cache page is freed and
* should be skipped from flushing to storage. Please see
* null_make_cache_space
*/
struct nullb_page {
struct page *page;
DECLARE_BITMAP(bitmap, MAP_SZ);
};
#define NULLB_PAGE_LOCK (MAP_SZ - 1)
#define NULLB_PAGE_FREE (MAP_SZ - 2)
static LIST_HEAD(nullb_list);
static struct mutex lock;
static int null_major;
static DEFINE_IDA(nullb_indexes);
static struct blk_mq_tag_set tag_set;
enum {
NULL_IRQ_NONE = 0,
NULL_IRQ_SOFTIRQ = 1,
NULL_IRQ_TIMER = 2,
};
static bool g_virt_boundary = false;
module_param_named(virt_boundary, g_virt_boundary, bool, 0444);
MODULE_PARM_DESC(virt_boundary, "Require a virtual boundary for the device. Default: False");
static int g_no_sched;
module_param_named(no_sched, g_no_sched, int, 0444);
MODULE_PARM_DESC(no_sched, "No io scheduler");
static int g_submit_queues = 1;
module_param_named(submit_queues, g_submit_queues, int, 0444);
MODULE_PARM_DESC(submit_queues, "Number of submission queues");
static int g_poll_queues = 1;
module_param_named(poll_queues, g_poll_queues, int, 0444);
MODULE_PARM_DESC(poll_queues, "Number of IOPOLL submission queues");
static int g_home_node = NUMA_NO_NODE;
module_param_named(home_node, g_home_node, int, 0444);
MODULE_PARM_DESC(home_node, "Home node for the device");
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
/*
* For more details about fault injection, please refer to
* Documentation/fault-injection/fault-injection.rst.
*/
static char g_timeout_str[80];
module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444);
MODULE_PARM_DESC(timeout, "Fault injection. timeout=<interval>,<probability>,<space>,<times>");
static char g_requeue_str[80];
module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444);
MODULE_PARM_DESC(requeue, "Fault injection. requeue=<interval>,<probability>,<space>,<times>");
static char g_init_hctx_str[80];
module_param_string(init_hctx, g_init_hctx_str, sizeof(g_init_hctx_str), 0444);
MODULE_PARM_DESC(init_hctx, "Fault injection to fail hctx init. init_hctx=<interval>,<probability>,<space>,<times>");
#endif
static int g_queue_mode = NULL_Q_MQ;
static int null_param_store_val(const char *str, int *val, int min, int max)
{
int ret, new_val;
ret = kstrtoint(str, 10, &new_val);
if (ret)
return -EINVAL;
if (new_val < min || new_val > max)
return -EINVAL;
*val = new_val;
return 0;
}
static int null_set_queue_mode(const char *str, const struct kernel_param *kp)
{
return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ);
}
static const struct kernel_param_ops null_queue_mode_param_ops = {
.set = null_set_queue_mode,
.get = param_get_int,
};
device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444);
MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)");
static int g_gb = 250;
module_param_named(gb, g_gb, int, 0444);
MODULE_PARM_DESC(gb, "Size in GB");
static int g_bs = 512;
module_param_named(bs, g_bs, int, 0444);
MODULE_PARM_DESC(bs, "Block size (in bytes)");
static int g_max_sectors;
module_param_named(max_sectors, g_max_sectors, int, 0444);
MODULE_PARM_DESC(max_sectors, "Maximum size of a command (in 512B sectors)");
static unsigned int g_max_segment_size = BLK_MAX_SEGMENT_SIZE;
module_param_named(max_segment_size, g_max_segment_size, int, 0444);
MODULE_PARM_DESC(max_segment_size, "Maximum size of a segment in bytes");
static unsigned int nr_devices = 1;
module_param(nr_devices, uint, 0444);
MODULE_PARM_DESC(nr_devices, "Number of devices to register");
static bool g_blocking;
module_param_named(blocking, g_blocking, bool, 0444);
MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device");
static bool shared_tags;
module_param(shared_tags, bool, 0444);
MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq");
static bool g_shared_tag_bitmap;
module_param_named(shared_tag_bitmap, g_shared_tag_bitmap, bool, 0444);
MODULE_PARM_DESC(shared_tag_bitmap, "Use shared tag bitmap for all submission queues for blk-mq");
static int g_irqmode = NULL_IRQ_SOFTIRQ;
static int null_set_irqmode(const char *str, const struct kernel_param *kp)
{
return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE,
NULL_IRQ_TIMER);
}
static const struct kernel_param_ops null_irqmode_param_ops = {
.set = null_set_irqmode,
.get = param_get_int,
};
device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444);
MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer");
static unsigned long g_completion_nsec = 10000;
module_param_named(completion_nsec, g_completion_nsec, ulong, 0444);
MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns");
static int g_hw_queue_depth = 64;
module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444);
MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64");
static bool g_use_per_node_hctx;
module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444);
MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false");
static bool g_memory_backed;
module_param_named(memory_backed, g_memory_backed, bool, 0444);
MODULE_PARM_DESC(memory_backed, "Create a memory-backed block device. Default: false");
static bool g_discard;
module_param_named(discard, g_discard, bool, 0444);
MODULE_PARM_DESC(discard, "Support discard operations (requires memory-backed null_blk device). Default: false");
static unsigned long g_cache_size;
module_param_named(cache_size, g_cache_size, ulong, 0444);
MODULE_PARM_DESC(mbps, "Cache size in MiB for memory-backed device. Default: 0 (none)");
static unsigned int g_mbps;
module_param_named(mbps, g_mbps, uint, 0444);
MODULE_PARM_DESC(mbps, "Limit maximum bandwidth (in MiB/s). Default: 0 (no limit)");
static bool g_zoned;
module_param_named(zoned, g_zoned, bool, S_IRUGO);
MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false");
static unsigned long g_zone_size = 256;
module_param_named(zone_size, g_zone_size, ulong, S_IRUGO);
MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256");
static unsigned long g_zone_capacity;
module_param_named(zone_capacity, g_zone_capacity, ulong, 0444);
MODULE_PARM_DESC(zone_capacity, "Zone capacity in MB when block device is zoned. Can be less than or equal to zone size. Default: Zone size");
static unsigned int g_zone_nr_conv;
module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444);
MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0");
static unsigned int g_zone_max_open;
module_param_named(zone_max_open, g_zone_max_open, uint, 0444);
MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones when block device is zoned. Default: 0 (no limit)");
static unsigned int g_zone_max_active;
module_param_named(zone_max_active, g_zone_max_active, uint, 0444);
MODULE_PARM_DESC(zone_max_active, "Maximum number of active zones when block device is zoned. Default: 0 (no limit)");
static struct nullb_device *null_alloc_dev(void);
static void null_free_dev(struct nullb_device *dev);
static void null_del_dev(struct nullb *nullb);
static int null_add_dev(struct nullb_device *dev);
static struct nullb *null_find_dev_by_name(const char *name);
static void null_free_device_storage(struct nullb_device *dev, bool is_cache);
static inline struct nullb_device *to_nullb_device(struct config_item *item)
{
return item ? container_of(to_config_group(item), struct nullb_device, group) : NULL;
}
static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page)
{
return snprintf(page, PAGE_SIZE, "%u\n", val);
}
static inline ssize_t nullb_device_ulong_attr_show(unsigned long val,
char *page)
{
return snprintf(page, PAGE_SIZE, "%lu\n", val);
}
static inline ssize_t nullb_device_bool_attr_show(bool val, char *page)
{
return snprintf(page, PAGE_SIZE, "%u\n", val);
}
static ssize_t nullb_device_uint_attr_store(unsigned int *val,
const char *page, size_t count)
{
unsigned int tmp;
int result;
result = kstrtouint(page, 0, &tmp);
if (result < 0)
return result;
*val = tmp;
return count;
}
static ssize_t nullb_device_ulong_attr_store(unsigned long *val,
const char *page, size_t count)
{
int result;
unsigned long tmp;
result = kstrtoul(page, 0, &tmp);
if (result < 0)
return result;
*val = tmp;
return count;
}
static ssize_t nullb_device_bool_attr_store(bool *val, const char *page,
size_t count)
{
bool tmp;
int result;
result = kstrtobool(page, &tmp);
if (result < 0)
return result;
*val = tmp;
return count;
}
/* The following macro should only be used with TYPE = {uint, ulong, bool}. */
#define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \
static ssize_t \
nullb_device_##NAME##_show(struct config_item *item, char *page) \
{ \
return nullb_device_##TYPE##_attr_show( \
to_nullb_device(item)->NAME, page); \
} \
static ssize_t \
nullb_device_##NAME##_store(struct config_item *item, const char *page, \
size_t count) \
{ \
int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\
struct nullb_device *dev = to_nullb_device(item); \
TYPE new_value = 0; \
int ret; \
\
ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\
if (ret < 0) \
return ret; \
if (apply_fn) \
ret = apply_fn(dev, new_value); \
else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \
ret = -EBUSY; \
if (ret < 0) \
return ret; \
dev->NAME = new_value; \
return count; \
} \
CONFIGFS_ATTR(nullb_device_, NAME);
static int nullb_update_nr_hw_queues(struct nullb_device *dev,
unsigned int submit_queues,
unsigned int poll_queues)
{
struct blk_mq_tag_set *set;
int ret, nr_hw_queues;
if (!dev->nullb)
return 0;
/*
* Make sure at least one submit queue exists.
*/
if (!submit_queues)
return -EINVAL;
/*
* Make sure that null_init_hctx() does not access nullb->queues[] past
* the end of that array.
*/
if (submit_queues > nr_cpu_ids || poll_queues > g_poll_queues)
return -EINVAL;
/*
* Keep previous and new queue numbers in nullb_device for reference in
* the call back function null_map_queues().
*/
dev->prev_submit_queues = dev->submit_queues;
dev->prev_poll_queues = dev->poll_queues;
dev->submit_queues = submit_queues;
dev->poll_queues = poll_queues;
set = dev->nullb->tag_set;
nr_hw_queues = submit_queues + poll_queues;
blk_mq_update_nr_hw_queues(set, nr_hw_queues);
ret = set->nr_hw_queues == nr_hw_queues ? 0 : -ENOMEM;
if (ret) {
/* on error, revert the queue numbers */
dev->submit_queues = dev->prev_submit_queues;
dev->poll_queues = dev->prev_poll_queues;
}
return ret;
}
static int nullb_apply_submit_queues(struct nullb_device *dev,
unsigned int submit_queues)
{
int ret;
mutex_lock(&lock);
ret = nullb_update_nr_hw_queues(dev, submit_queues, dev->poll_queues);
mutex_unlock(&lock);
return ret;
}
static int nullb_apply_poll_queues(struct nullb_device *dev,
unsigned int poll_queues)
{
int ret;
mutex_lock(&lock);
ret = nullb_update_nr_hw_queues(dev, dev->submit_queues, poll_queues);
mutex_unlock(&lock);
return ret;
}
NULLB_DEVICE_ATTR(size, ulong, NULL);
NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL);
NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues);
NULLB_DEVICE_ATTR(poll_queues, uint, nullb_apply_poll_queues);
NULLB_DEVICE_ATTR(home_node, uint, NULL);
NULLB_DEVICE_ATTR(queue_mode, uint, NULL);
NULLB_DEVICE_ATTR(blocksize, uint, NULL);
NULLB_DEVICE_ATTR(max_sectors, uint, NULL);
NULLB_DEVICE_ATTR(max_segment_size, uint, NULL);
NULLB_DEVICE_ATTR(irqmode, uint, NULL);
NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL);
NULLB_DEVICE_ATTR(index, uint, NULL);
NULLB_DEVICE_ATTR(blocking, bool, NULL);
NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL);
NULLB_DEVICE_ATTR(memory_backed, bool, NULL);
NULLB_DEVICE_ATTR(discard, bool, NULL);
NULLB_DEVICE_ATTR(mbps, uint, NULL);
NULLB_DEVICE_ATTR(cache_size, ulong, NULL);
NULLB_DEVICE_ATTR(zoned, bool, NULL);
NULLB_DEVICE_ATTR(zone_size, ulong, NULL);
NULLB_DEVICE_ATTR(zone_capacity, ulong, NULL);
NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL);
NULLB_DEVICE_ATTR(zone_max_open, uint, NULL);
NULLB_DEVICE_ATTR(zone_max_active, uint, NULL);
NULLB_DEVICE_ATTR(virt_boundary, bool, NULL);
NULLB_DEVICE_ATTR(no_sched, bool, NULL);
NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL);
static ssize_t nullb_device_power_show(struct config_item *item, char *page)
{
return nullb_device_bool_attr_show(to_nullb_device(item)->power, page);
}
static ssize_t nullb_device_power_store(struct config_item *item,
const char *page, size_t count)
{
struct nullb_device *dev = to_nullb_device(item);
bool newp = false;
ssize_t ret;
ret = nullb_device_bool_attr_store(&newp, page, count);
if (ret < 0)
return ret;
ret = count;
mutex_lock(&lock);
if (!dev->power && newp) {
if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags))
goto out;
ret = null_add_dev(dev);
if (ret) {
clear_bit(NULLB_DEV_FL_UP, &dev->flags);
goto out;
}
set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags);
dev->power = newp;
ret = count;
} else if (dev->power && !newp) {
if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) {
dev->power = newp;
null_del_dev(dev->nullb);
}
clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags);
}
out:
mutex_unlock(&lock);
return ret;
}
CONFIGFS_ATTR(nullb_device_, power);
static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page)
{
struct nullb_device *t_dev = to_nullb_device(item);
return badblocks_show(&t_dev->badblocks, page, 0);
}
static ssize_t nullb_device_badblocks_store(struct config_item *item,
const char *page, size_t count)
{
struct nullb_device *t_dev = to_nullb_device(item);
char *orig, *buf, *tmp;
u64 start, end;
int ret;
orig = kstrndup(page, count, GFP_KERNEL);
if (!orig)
return -ENOMEM;
buf = strstrip(orig);
ret = -EINVAL;
if (buf[0] != '+' && buf[0] != '-')
goto out;
tmp = strchr(&buf[1], '-');
if (!tmp)
goto out;
*tmp = '\0';
ret = kstrtoull(buf + 1, 0, &start);
if (ret)
goto out;
ret = kstrtoull(tmp + 1, 0, &end);
if (ret)
goto out;
ret = -EINVAL;
if (start > end)
goto out;
/* enable badblocks */
cmpxchg(&t_dev->badblocks.shift, -1, 0);
if (buf[0] == '+')
ret = badblocks_set(&t_dev->badblocks, start,
end - start + 1, 1);
else
ret = badblocks_clear(&t_dev->badblocks, start,
end - start + 1);
if (ret == 0)
ret = count;
out:
kfree(orig);
return ret;
}
CONFIGFS_ATTR(nullb_device_, badblocks);
static ssize_t nullb_device_zone_readonly_store(struct config_item *item,
const char *page, size_t count)
{
struct nullb_device *dev = to_nullb_device(item);
return zone_cond_store(dev, page, count, BLK_ZONE_COND_READONLY);
}
CONFIGFS_ATTR_WO(nullb_device_, zone_readonly);
static ssize_t nullb_device_zone_offline_store(struct config_item *item,
const char *page, size_t count)
{
struct nullb_device *dev = to_nullb_device(item);
return zone_cond_store(dev, page, count, BLK_ZONE_COND_OFFLINE);
}
CONFIGFS_ATTR_WO(nullb_device_, zone_offline);
static struct configfs_attribute *nullb_device_attrs[] = {
&nullb_device_attr_size,
&nullb_device_attr_completion_nsec,
&nullb_device_attr_submit_queues,
&nullb_device_attr_poll_queues,
&nullb_device_attr_home_node,
&nullb_device_attr_queue_mode,
&nullb_device_attr_blocksize,
&nullb_device_attr_max_sectors,
&nullb_device_attr_max_segment_size,
&nullb_device_attr_irqmode,
&nullb_device_attr_hw_queue_depth,
&nullb_device_attr_index,
&nullb_device_attr_blocking,
&nullb_device_attr_use_per_node_hctx,
&nullb_device_attr_power,
&nullb_device_attr_memory_backed,
&nullb_device_attr_discard,
&nullb_device_attr_mbps,
&nullb_device_attr_cache_size,
&nullb_device_attr_badblocks,
&nullb_device_attr_zoned,
&nullb_device_attr_zone_size,
&nullb_device_attr_zone_capacity,
&nullb_device_attr_zone_nr_conv,
&nullb_device_attr_zone_max_open,
&nullb_device_attr_zone_max_active,
&nullb_device_attr_zone_readonly,
&nullb_device_attr_zone_offline,
&nullb_device_attr_virt_boundary,
&nullb_device_attr_no_sched,
&nullb_device_attr_shared_tag_bitmap,
NULL,
};
static void nullb_device_release(struct config_item *item)
{
struct nullb_device *dev = to_nullb_device(item);
null_free_device_storage(dev, false);
null_free_dev(dev);
}
static struct configfs_item_operations nullb_device_ops = {
.release = nullb_device_release,
};
static const struct config_item_type nullb_device_type = {
.ct_item_ops = &nullb_device_ops,
.ct_attrs = nullb_device_attrs,
.ct_owner = THIS_MODULE,
};
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
static void nullb_add_fault_config(struct nullb_device *dev)
{
fault_config_init(&dev->timeout_config, "timeout_inject");
fault_config_init(&dev->requeue_config, "requeue_inject");
fault_config_init(&dev->init_hctx_fault_config, "init_hctx_fault_inject");
configfs_add_default_group(&dev->timeout_config.group, &dev->group);
configfs_add_default_group(&dev->requeue_config.group, &dev->group);
configfs_add_default_group(&dev->init_hctx_fault_config.group, &dev->group);
}
#else
static void nullb_add_fault_config(struct nullb_device *dev)
{
}
#endif
static struct
config_group *nullb_group_make_group(struct config_group *group, const char *name)
{
struct nullb_device *dev;
if (null_find_dev_by_name(name))
return ERR_PTR(-EEXIST);
dev = null_alloc_dev();
if (!dev)
return ERR_PTR(-ENOMEM);
config_group_init_type_name(&dev->group, name, &nullb_device_type);
nullb_add_fault_config(dev);
return &dev->group;
}
static void
nullb_group_drop_item(struct config_group *group, struct config_item *item)
{
struct nullb_device *dev = to_nullb_device(item);
if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) {
mutex_lock(&lock);
dev->power = false;
null_del_dev(dev->nullb);
mutex_unlock(&lock);
}
config_item_put(item);
}
static ssize_t memb_group_features_show(struct config_item *item, char *page)
{
return snprintf(page, PAGE_SIZE,
"badblocks,blocking,blocksize,cache_size,"
"completion_nsec,discard,home_node,hw_queue_depth,"
"irqmode,max_sectors,max_segment_size,mbps,"
"memory_backed,no_sched,"
"poll_queues,power,queue_mode,shared_tag_bitmap,size,"
"submit_queues,use_per_node_hctx,virt_boundary,zoned,"
"zone_capacity,zone_max_active,zone_max_open,"
"zone_nr_conv,zone_offline,zone_readonly,zone_size\n");
}
CONFIGFS_ATTR_RO(memb_group_, features);
static struct configfs_attribute *nullb_group_attrs[] = {
&memb_group_attr_features,
NULL,
};
static struct configfs_group_operations nullb_group_ops = {
.make_group = nullb_group_make_group,
.drop_item = nullb_group_drop_item,
};
static const struct config_item_type nullb_group_type = {
.ct_group_ops = &nullb_group_ops,
.ct_attrs = nullb_group_attrs,
.ct_owner = THIS_MODULE,
};
static struct configfs_subsystem nullb_subsys = {
.su_group = {
.cg_item = {
.ci_namebuf = "nullb",
.ci_type = &nullb_group_type,
},
},
};
static inline int null_cache_active(struct nullb *nullb)
{
return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags);
}
static struct nullb_device *null_alloc_dev(void)
{
struct nullb_device *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
dev->timeout_config.attr = null_timeout_attr;
dev->requeue_config.attr = null_requeue_attr;
dev->init_hctx_fault_config.attr = null_init_hctx_attr;
#endif
INIT_RADIX_TREE(&dev->data, GFP_ATOMIC);
INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC);
if (badblocks_init(&dev->badblocks, 0)) {
kfree(dev);
return NULL;
}
dev->size = g_gb * 1024;
dev->completion_nsec = g_completion_nsec;
dev->submit_queues = g_submit_queues;
dev->prev_submit_queues = g_submit_queues;
dev->poll_queues = g_poll_queues;
dev->prev_poll_queues = g_poll_queues;
dev->home_node = g_home_node;
dev->queue_mode = g_queue_mode;
dev->blocksize = g_bs;
dev->max_sectors = g_max_sectors;
dev->max_segment_size = g_max_segment_size;
dev->irqmode = g_irqmode;
dev->hw_queue_depth = g_hw_queue_depth;
dev->blocking = g_blocking;
dev->memory_backed = g_memory_backed;
dev->discard = g_discard;
dev->cache_size = g_cache_size;
dev->mbps = g_mbps;
dev->use_per_node_hctx = g_use_per_node_hctx;
dev->zoned = g_zoned;
dev->zone_size = g_zone_size;
dev->zone_capacity = g_zone_capacity;
dev->zone_nr_conv = g_zone_nr_conv;
dev->zone_max_open = g_zone_max_open;
dev->zone_max_active = g_zone_max_active;
dev->virt_boundary = g_virt_boundary;
dev->no_sched = g_no_sched;
dev->shared_tag_bitmap = g_shared_tag_bitmap;
return dev;
}
static void null_free_dev(struct nullb_device *dev)
{
if (!dev)
return;
null_free_zoned_dev(dev);
badblocks_exit(&dev->badblocks);
kfree(dev);
}
static void put_tag(struct nullb_queue *nq, unsigned int tag)
{
clear_bit_unlock(tag, nq->tag_map);
if (waitqueue_active(&nq->wait))
wake_up(&nq->wait);
}
static unsigned int get_tag(struct nullb_queue *nq)
{
unsigned int tag;
do {
tag = find_first_zero_bit(nq->tag_map, nq->queue_depth);
if (tag >= nq->queue_depth)
return -1U;
} while (test_and_set_bit_lock(tag, nq->tag_map));
return tag;
}
static void free_cmd(struct nullb_cmd *cmd)
{
put_tag(cmd->nq, cmd->tag);
}
static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer);
static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq)
{
struct nullb_cmd *cmd;
unsigned int tag;
tag = get_tag(nq);
if (tag != -1U) {
cmd = &nq->cmds[tag];
cmd->tag = tag;
cmd->error = BLK_STS_OK;
cmd->nq = nq;
if (nq->dev->irqmode == NULL_IRQ_TIMER) {
hrtimer_init(&cmd->timer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
cmd->timer.function = null_cmd_timer_expired;
}
return cmd;
}
return NULL;
}
static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, struct bio *bio)
{
struct nullb_cmd *cmd;
DEFINE_WAIT(wait);
do {
/*
* This avoids multiple return statements, multiple calls to
* __alloc_cmd() and a fast path call to prepare_to_wait().
*/
cmd = __alloc_cmd(nq);
if (cmd) {
cmd->bio = bio;
return cmd;
}
prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE);
io_schedule();
finish_wait(&nq->wait, &wait);
} while (1);
}
static void end_cmd(struct nullb_cmd *cmd)
{
int queue_mode = cmd->nq->dev->queue_mode;
switch (queue_mode) {
case NULL_Q_MQ:
blk_mq_end_request(cmd->rq, cmd->error);
return;
case NULL_Q_BIO:
cmd->bio->bi_status = cmd->error;
bio_endio(cmd->bio);
break;
}
free_cmd(cmd);
}
static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer)
{
end_cmd(container_of(timer, struct nullb_cmd, timer));
return HRTIMER_NORESTART;
}
static void null_cmd_end_timer(struct nullb_cmd *cmd)
{
ktime_t kt = cmd->nq->dev->completion_nsec;
hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL);
}
static void null_complete_rq(struct request *rq)
{
end_cmd(blk_mq_rq_to_pdu(rq));
}
static struct nullb_page *null_alloc_page(void)
{
struct nullb_page *t_page;
t_page = kmalloc(sizeof(struct nullb_page), GFP_NOIO);
if (!t_page)
return NULL;
t_page->page = alloc_pages(GFP_NOIO, 0);
if (!t_page->page) {
kfree(t_page);
return NULL;
}
memset(t_page->bitmap, 0, sizeof(t_page->bitmap));
return t_page;
}
static void null_free_page(struct nullb_page *t_page)
{
__set_bit(NULLB_PAGE_FREE, t_page->bitmap);
if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))
return;
__free_page(t_page->page);
kfree(t_page);
}
static bool null_page_empty(struct nullb_page *page)
{
int size = MAP_SZ - 2;
return find_first_bit(page->bitmap, size) == size;
}
static void null_free_sector(struct nullb *nullb, sector_t sector,
bool is_cache)
{
unsigned int sector_bit;
u64 idx;
struct nullb_page *t_page, *ret;
struct radix_tree_root *root;
root = is_cache ? &nullb->dev->cache : &nullb->dev->data;
idx = sector >> PAGE_SECTORS_SHIFT;
sector_bit = (sector & SECTOR_MASK);
t_page = radix_tree_lookup(root, idx);
if (t_page) {
__clear_bit(sector_bit, t_page->bitmap);
if (null_page_empty(t_page)) {
ret = radix_tree_delete_item(root, idx, t_page);
WARN_ON(ret != t_page);
null_free_page(ret);
if (is_cache)
nullb->dev->curr_cache -= PAGE_SIZE;
}
}
}
static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx,
struct nullb_page *t_page, bool is_cache)
{
struct radix_tree_root *root;
root = is_cache ? &nullb->dev->cache : &nullb->dev->data;
if (radix_tree_insert(root, idx, t_page)) {
null_free_page(t_page);
t_page = radix_tree_lookup(root, idx);
WARN_ON(!t_page || t_page->page->index != idx);
} else if (is_cache)
nullb->dev->curr_cache += PAGE_SIZE;
return t_page;
}
static void null_free_device_storage(struct nullb_device *dev, bool is_cache)
{
unsigned long pos = 0;
int nr_pages;
struct nullb_page *ret, *t_pages[FREE_BATCH];
struct radix_tree_root *root;
root = is_cache ? &dev->cache : &dev->data;
do {
int i;
nr_pages = radix_tree_gang_lookup(root,
(void **)t_pages, pos, FREE_BATCH);
for (i = 0; i < nr_pages; i++) {
pos = t_pages[i]->page->index;
ret = radix_tree_delete_item(root, pos, t_pages[i]);
WARN_ON(ret != t_pages[i]);
null_free_page(ret);
}
pos++;
} while (nr_pages == FREE_BATCH);
if (is_cache)
dev->curr_cache = 0;
}
static struct nullb_page *__null_lookup_page(struct nullb *nullb,
sector_t sector, bool for_write, bool is_cache)
{
unsigned int sector_bit;
u64 idx;
struct nullb_page *t_page;
struct radix_tree_root *root;
idx = sector >> PAGE_SECTORS_SHIFT;
sector_bit = (sector & SECTOR_MASK);
root = is_cache ? &nullb->dev->cache : &nullb->dev->data;
t_page = radix_tree_lookup(root, idx);
WARN_ON(t_page && t_page->page->index != idx);
if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))
return t_page;
return NULL;
}
static struct nullb_page *null_lookup_page(struct nullb *nullb,
sector_t sector, bool for_write, bool ignore_cache)
{
struct nullb_page *page = NULL;
if (!ignore_cache)
page = __null_lookup_page(nullb, sector, for_write, true);
if (page)
return page;
return __null_lookup_page(nullb, sector, for_write, false);
}
static struct nullb_page *null_insert_page(struct nullb *nullb,
sector_t sector, bool ignore_cache)
__releases(&nullb->lock)
__acquires(&nullb->lock)
{
u64 idx;
struct nullb_page *t_page;
t_page = null_lookup_page(nullb, sector, true, ignore_cache);
if (t_page)
return t_page;
spin_unlock_irq(&nullb->lock);
t_page = null_alloc_page();
if (!t_page)
goto out_lock;
if (radix_tree_preload(GFP_NOIO))
goto out_freepage;
spin_lock_irq(&nullb->lock);
idx = sector >> PAGE_SECTORS_SHIFT;
t_page->page->index = idx;
t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);
radix_tree_preload_end();
return t_page;
out_freepage:
null_free_page(t_page);
out_lock:
spin_lock_irq(&nullb->lock);
return null_lookup_page(nullb, sector, true, ignore_cache);
}
static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page)
{
int i;
unsigned int offset;
u64 idx;
struct nullb_page *t_page, *ret;
void *dst, *src;
idx = c_page->page->index;
t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);
__clear_bit(NULLB_PAGE_LOCK, c_page->bitmap);
if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) {
null_free_page(c_page);
if (t_page && null_page_empty(t_page)) {
ret = radix_tree_delete_item(&nullb->dev->data,
idx, t_page);
null_free_page(t_page);
}
return 0;
}
if (!t_page)
return -ENOMEM;
src = kmap_local_page(c_page->page);
dst = kmap_local_page(t_page->page);
for (i = 0; i < PAGE_SECTORS;
i += (nullb->dev->blocksize >> SECTOR_SHIFT)) {
if (test_bit(i, c_page->bitmap)) {
offset = (i << SECTOR_SHIFT);
memcpy(dst + offset, src + offset,
nullb->dev->blocksize);
__set_bit(i, t_page->bitmap);
}
}
kunmap_local(dst);
kunmap_local(src);
ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page);
null_free_page(ret);
nullb->dev->curr_cache -= PAGE_SIZE;
return 0;
}
static int null_make_cache_space(struct nullb *nullb, unsigned long n)
{
int i, err, nr_pages;
struct nullb_page *c_pages[FREE_BATCH];
unsigned long flushed = 0, one_round;
again:
if ((nullb->dev->cache_size * 1024 * 1024) >
nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0)
return 0;
nr_pages = radix_tree_gang_lookup(&nullb->dev->cache,
(void **)c_pages, nullb->cache_flush_pos, FREE_BATCH);
/*
* nullb_flush_cache_page could unlock before using the c_pages. To
* avoid race, we don't allow page free
*/
for (i = 0; i < nr_pages; i++) {
nullb->cache_flush_pos = c_pages[i]->page->index;
/*
* We found the page which is being flushed to disk by other
* threads
*/
if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap))
c_pages[i] = NULL;
else
__set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap);
}
one_round = 0;
for (i = 0; i < nr_pages; i++) {
if (c_pages[i] == NULL)
continue;
err = null_flush_cache_page(nullb, c_pages[i]);
if (err)
return err;
one_round++;
}
flushed += one_round << PAGE_SHIFT;
if (n > flushed) {
if (nr_pages == 0)
nullb->cache_flush_pos = 0;
if (one_round == 0) {
/* give other threads a chance */
spin_unlock_irq(&nullb->lock);
spin_lock_irq(&nullb->lock);
}
goto again;
}
return 0;
}
static int copy_to_nullb(struct nullb *nullb, struct page *source,
unsigned int off, sector_t sector, size_t n, bool is_fua)
{
size_t temp, count = 0;
unsigned int offset;
struct nullb_page *t_page;
while (count < n) {
temp = min_t(size_t, nullb->dev->blocksize, n - count);
if (null_cache_active(nullb) && !is_fua)
null_make_cache_space(nullb, PAGE_SIZE);
offset = (sector & SECTOR_MASK) << SECTOR_SHIFT;
t_page = null_insert_page(nullb, sector,
!null_cache_active(nullb) || is_fua);
if (!t_page)
return -ENOSPC;
memcpy_page(t_page->page, offset, source, off + count, temp);
__set_bit(sector & SECTOR_MASK, t_page->bitmap);
if (is_fua)
null_free_sector(nullb, sector, true);
count += temp;
sector += temp >> SECTOR_SHIFT;
}
return 0;
}
static int copy_from_nullb(struct nullb *nullb, struct page *dest,
unsigned int off, sector_t sector, size_t n)
{
size_t temp, count = 0;
unsigned int offset;
struct nullb_page *t_page;
while (count < n) {
temp = min_t(size_t, nullb->dev->blocksize, n - count);
offset = (sector & SECTOR_MASK) << SECTOR_SHIFT;
t_page = null_lookup_page(nullb, sector, false,
!null_cache_active(nullb));
if (t_page)
memcpy_page(dest, off + count, t_page->page, offset,
temp);
else
zero_user(dest, off + count, temp);
count += temp;
sector += temp >> SECTOR_SHIFT;
}
return 0;
}
static void nullb_fill_pattern(struct nullb *nullb, struct page *page,
unsigned int len, unsigned int off)
{
memset_page(page, off, 0xff, len);
}
blk_status_t null_handle_discard(struct nullb_device *dev,
sector_t sector, sector_t nr_sectors)
{
struct nullb *nullb = dev->nullb;
size_t n = nr_sectors << SECTOR_SHIFT;
size_t temp;
spin_lock_irq(&nullb->lock);
while (n > 0) {
temp = min_t(size_t, n, dev->blocksize);
null_free_sector(nullb, sector, false);
if (null_cache_active(nullb))
null_free_sector(nullb, sector, true);
sector += temp >> SECTOR_SHIFT;
n -= temp;
}
spin_unlock_irq(&nullb->lock);
return BLK_STS_OK;
}
static int null_handle_flush(struct nullb *nullb)
{
int err;
if (!null_cache_active(nullb))
return 0;
spin_lock_irq(&nullb->lock);
while (true) {
err = null_make_cache_space(nullb,
nullb->dev->cache_size * 1024 * 1024);
if (err || nullb->dev->curr_cache == 0)
break;
}
WARN_ON(!radix_tree_empty(&nullb->dev->cache));
spin_unlock_irq(&nullb->lock);
return err;
}
static int null_transfer(struct nullb *nullb, struct page *page,
unsigned int len, unsigned int off, bool is_write, sector_t sector,
bool is_fua)
{
struct nullb_device *dev = nullb->dev;
unsigned int valid_len = len;
int err = 0;
WARN_ONCE(len > dev->max_segment_size, "%u > %u\n", len,
dev->max_segment_size);
if (!is_write) {
if (dev->zoned)
valid_len = null_zone_valid_read_len(nullb,
sector, len);
if (valid_len) {
err = copy_from_nullb(nullb, page, off,
sector, valid_len);
off += valid_len;
len -= valid_len;
}
if (len)
nullb_fill_pattern(nullb, page, len, off);
flush_dcache_page(page);
} else {
flush_dcache_page(page);
err = copy_to_nullb(nullb, page, off, sector, len, is_fua);
}
return err;
}
static int null_handle_rq(struct nullb_cmd *cmd)
{
struct request *rq = cmd->rq;
struct nullb *nullb = cmd->nq->dev->nullb;
int err;
unsigned int len;
sector_t sector = blk_rq_pos(rq);
struct req_iterator iter;
struct bio_vec bvec;
spin_lock_irq(&nullb->lock);
rq_for_each_segment(bvec, rq, iter) {
len = min(bvec.bv_len, nullb->dev->max_segment_size);
bvec.bv_len = len;
err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset,
op_is_write(req_op(rq)), sector,
rq->cmd_flags & REQ_FUA);
if (err) {
spin_unlock_irq(&nullb->lock);
return err;
}
sector += len >> SECTOR_SHIFT;
}
spin_unlock_irq(&nullb->lock);
return 0;
}
static int null_handle_bio(struct nullb_cmd *cmd)
{
struct bio *bio = cmd->bio;
struct nullb *nullb = cmd->nq->dev->nullb;
int err;
unsigned int len;
sector_t sector = bio->bi_iter.bi_sector;
struct bio_vec bvec;
struct bvec_iter iter;
spin_lock_irq(&nullb->lock);
bio_for_each_segment(bvec, bio, iter) {
len = min(bvec.bv_len, nullb->dev->max_segment_size);
bvec.bv_len = len;
err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset,
op_is_write(bio_op(bio)), sector,
bio->bi_opf & REQ_FUA);
if (err) {
spin_unlock_irq(&nullb->lock);
return err;
}
sector += len >> SECTOR_SHIFT;
}
spin_unlock_irq(&nullb->lock);
return 0;
}
static void null_stop_queue(struct nullb *nullb)
{
struct request_queue *q = nullb->q;
if (nullb->dev->queue_mode == NULL_Q_MQ)
blk_mq_stop_hw_queues(q);
}
static void null_restart_queue_async(struct nullb *nullb)
{
struct request_queue *q = nullb->q;
if (nullb->dev->queue_mode == NULL_Q_MQ)
blk_mq_start_stopped_hw_queues(q, true);
}
static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd)
{
struct nullb_device *dev = cmd->nq->dev;
struct nullb *nullb = dev->nullb;
blk_status_t sts = BLK_STS_OK;
struct request *rq = cmd->rq;
if (!hrtimer_active(&nullb->bw_timer))
hrtimer_restart(&nullb->bw_timer);
if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) {
null_stop_queue(nullb);
/* race with timer */
if (atomic_long_read(&nullb->cur_bytes) > 0)
null_restart_queue_async(nullb);
/* requeue request */
sts = BLK_STS_DEV_RESOURCE;
}
return sts;
}
static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd,
sector_t sector,
sector_t nr_sectors)
{
struct badblocks *bb = &cmd->nq->dev->badblocks;
sector_t first_bad;
int bad_sectors;
if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors))
return BLK_STS_IOERR;
return BLK_STS_OK;
}
static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd,
enum req_op op,
sector_t sector,
sector_t nr_sectors)
{
struct nullb_device *dev = cmd->nq->dev;
int err;
if (op == REQ_OP_DISCARD)
return null_handle_discard(dev, sector, nr_sectors);
if (dev->queue_mode == NULL_Q_BIO)
err = null_handle_bio(cmd);
else
err = null_handle_rq(cmd);
return errno_to_blk_status(err);
}
static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd)
{
struct nullb_device *dev = cmd->nq->dev;
struct bio *bio;
if (dev->memory_backed)
return;
if (dev->queue_mode == NULL_Q_BIO && bio_op(cmd->bio) == REQ_OP_READ) {
zero_fill_bio(cmd->bio);
} else if (req_op(cmd->rq) == REQ_OP_READ) {
__rq_for_each_bio(bio, cmd->rq)
zero_fill_bio(bio);
}
}
static inline void nullb_complete_cmd(struct nullb_cmd *cmd)
{
/*
* Since root privileges are required to configure the null_blk
* driver, it is fine that this driver does not initialize the
* data buffers of read commands. Zero-initialize these buffers
* anyway if KMSAN is enabled to prevent that KMSAN complains
* about null_blk not initializing read data buffers.
*/
if (IS_ENABLED(CONFIG_KMSAN))
nullb_zero_read_cmd_buffer(cmd);
/* Complete IO by inline, softirq or timer */
switch (cmd->nq->dev->irqmode) {
case NULL_IRQ_SOFTIRQ:
switch (cmd->nq->dev->queue_mode) {
case NULL_Q_MQ:
blk_mq_complete_request(cmd->rq);
break;
case NULL_Q_BIO:
/*
* XXX: no proper submitting cpu information available.
*/
end_cmd(cmd);
break;
}
break;
case NULL_IRQ_NONE:
end_cmd(cmd);
break;
case NULL_IRQ_TIMER:
null_cmd_end_timer(cmd);
break;
}
}
blk_status_t null_process_cmd(struct nullb_cmd *cmd, enum req_op op,
sector_t sector, unsigned int nr_sectors)
{
struct nullb_device *dev = cmd->nq->dev;
blk_status_t ret;
if (dev->badblocks.shift != -1) {
ret = null_handle_badblocks(cmd, sector, nr_sectors);
if (ret != BLK_STS_OK)
return ret;
}
if (dev->memory_backed)
return null_handle_memory_backed(cmd, op, sector, nr_sectors);
return BLK_STS_OK;
}
static blk_status_t null_handle_cmd(struct nullb_cmd *cmd, sector_t sector,
sector_t nr_sectors, enum req_op op)
{
struct nullb_device *dev = cmd->nq->dev;
struct nullb *nullb = dev->nullb;
blk_status_t sts;
if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) {
sts = null_handle_throttled(cmd);
if (sts != BLK_STS_OK)
return sts;
}
if (op == REQ_OP_FLUSH) {
cmd->error = errno_to_blk_status(null_handle_flush(nullb));
goto out;
}
if (dev->zoned)
sts = null_process_zoned_cmd(cmd, op, sector, nr_sectors);
else
sts = null_process_cmd(cmd, op, sector, nr_sectors);
/* Do not overwrite errors (e.g. timeout errors) */
if (cmd->error == BLK_STS_OK)
cmd->error = sts;
out:
nullb_complete_cmd(cmd);
return BLK_STS_OK;
}
static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer)
{
struct nullb *nullb = container_of(timer, struct nullb, bw_timer);
ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL);
unsigned int mbps = nullb->dev->mbps;
if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps))
return HRTIMER_NORESTART;
atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps));
null_restart_queue_async(nullb);
hrtimer_forward_now(&nullb->bw_timer, timer_interval);
return HRTIMER_RESTART;
}
static void nullb_setup_bwtimer(struct nullb *nullb)
{
ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL);
hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
nullb->bw_timer.function = nullb_bwtimer_fn;
atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps));
hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL);
}
static struct nullb_queue *nullb_to_queue(struct nullb *nullb)
{
int index = 0;
if (nullb->nr_queues != 1)
index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues);
return &nullb->queues[index];
}
static void null_submit_bio(struct bio *bio)
{
sector_t sector = bio->bi_iter.bi_sector;
sector_t nr_sectors = bio_sectors(bio);
struct nullb *nullb = bio->bi_bdev->bd_disk->private_data;
struct nullb_queue *nq = nullb_to_queue(nullb);
null_handle_cmd(alloc_cmd(nq, bio), sector, nr_sectors, bio_op(bio));
}
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
static bool should_timeout_request(struct request *rq)
{
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq);
struct nullb_device *dev = cmd->nq->dev;
return should_fail(&dev->timeout_config.attr, 1);
}
static bool should_requeue_request(struct request *rq)
{
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq);
struct nullb_device *dev = cmd->nq->dev;
return should_fail(&dev->requeue_config.attr, 1);
}
static bool should_init_hctx_fail(struct nullb_device *dev)
{
return should_fail(&dev->init_hctx_fault_config.attr, 1);
}
#else
static bool should_timeout_request(struct request *rq)
{
return false;
}
static bool should_requeue_request(struct request *rq)
{
return false;
}
static bool should_init_hctx_fail(struct nullb_device *dev)
{
return false;
}
#endif
static void null_map_queues(struct blk_mq_tag_set *set)
{
struct nullb *nullb = set->driver_data;
int i, qoff;
unsigned int submit_queues = g_submit_queues;
unsigned int poll_queues = g_poll_queues;
if (nullb) {
struct nullb_device *dev = nullb->dev;
/*
* Refer nr_hw_queues of the tag set to check if the expected
* number of hardware queues are prepared. If block layer failed
* to prepare them, use previous numbers of submit queues and
* poll queues to map queues.
*/
if (set->nr_hw_queues ==
dev->submit_queues + dev->poll_queues) {
submit_queues = dev->submit_queues;
poll_queues = dev->poll_queues;
} else if (set->nr_hw_queues ==
dev->prev_submit_queues + dev->prev_poll_queues) {
submit_queues = dev->prev_submit_queues;
poll_queues = dev->prev_poll_queues;
} else {
pr_warn("tag set has unexpected nr_hw_queues: %d\n",
set->nr_hw_queues);
WARN_ON_ONCE(true);
submit_queues = 1;
poll_queues = 0;
}
}
for (i = 0, qoff = 0; i < set->nr_maps; i++) {
struct blk_mq_queue_map *map = &set->map[i];
switch (i) {
case HCTX_TYPE_DEFAULT:
map->nr_queues = submit_queues;
break;
case HCTX_TYPE_READ:
map->nr_queues = 0;
continue;
case HCTX_TYPE_POLL:
map->nr_queues = poll_queues;
break;
}
map->queue_offset = qoff;
qoff += map->nr_queues;
blk_mq_map_queues(map);
}
}
static int null_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
{
struct nullb_queue *nq = hctx->driver_data;
LIST_HEAD(list);
int nr = 0;
struct request *rq;
spin_lock(&nq->poll_lock);
list_splice_init(&nq->poll_list, &list);
list_for_each_entry(rq, &list, queuelist)
blk_mq_set_request_complete(rq);
spin_unlock(&nq->poll_lock);
while (!list_empty(&list)) {
struct nullb_cmd *cmd;
struct request *req;
req = list_first_entry(&list, struct request, queuelist);
list_del_init(&req->queuelist);
cmd = blk_mq_rq_to_pdu(req);
cmd->error = null_process_cmd(cmd, req_op(req), blk_rq_pos(req),
blk_rq_sectors(req));
if (!blk_mq_add_to_batch(req, iob, (__force int) cmd->error,
blk_mq_end_request_batch))
end_cmd(cmd);
nr++;
}
return nr;
}
static enum blk_eh_timer_return null_timeout_rq(struct request *rq)
{
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq);
if (hctx->type == HCTX_TYPE_POLL) {
struct nullb_queue *nq = hctx->driver_data;
spin_lock(&nq->poll_lock);
/* The request may have completed meanwhile. */
if (blk_mq_request_completed(rq)) {
spin_unlock(&nq->poll_lock);
return BLK_EH_DONE;
}
list_del_init(&rq->queuelist);
spin_unlock(&nq->poll_lock);
}
pr_info("rq %p timed out\n", rq);
/*
* If the device is marked as blocking (i.e. memory backed or zoned
* device), the submission path may be blocked waiting for resources
* and cause real timeouts. For these real timeouts, the submission
* path will complete the request using blk_mq_complete_request().
* Only fake timeouts need to execute blk_mq_complete_request() here.
*/
cmd->error = BLK_STS_TIMEOUT;
if (cmd->fake_timeout || hctx->type == HCTX_TYPE_POLL)
blk_mq_complete_request(rq);
return BLK_EH_DONE;
}
static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct request *rq = bd->rq;
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq);
struct nullb_queue *nq = hctx->driver_data;
sector_t nr_sectors = blk_rq_sectors(rq);
sector_t sector = blk_rq_pos(rq);
const bool is_poll = hctx->type == HCTX_TYPE_POLL;
might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING);
if (!is_poll && nq->dev->irqmode == NULL_IRQ_TIMER) {
hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
cmd->timer.function = null_cmd_timer_expired;
}
cmd->rq = rq;
cmd->error = BLK_STS_OK;
cmd->nq = nq;
cmd->fake_timeout = should_timeout_request(rq) ||
blk_should_fake_timeout(rq->q);
blk_mq_start_request(rq);
if (should_requeue_request(rq)) {
/*
* Alternate between hitting the core BUSY path, and the
* driver driven requeue path
*/
nq->requeue_selection++;
if (nq->requeue_selection & 1)
return BLK_STS_RESOURCE;
blk_mq_requeue_request(rq, true);
return BLK_STS_OK;
}
if (is_poll) {
spin_lock(&nq->poll_lock);
list_add_tail(&rq->queuelist, &nq->poll_list);
spin_unlock(&nq->poll_lock);
return BLK_STS_OK;
}
if (cmd->fake_timeout)
return BLK_STS_OK;
return null_handle_cmd(cmd, sector, nr_sectors, req_op(rq));
}
static void cleanup_queue(struct nullb_queue *nq)
{
bitmap_free(nq->tag_map);
kfree(nq->cmds);
}
static void cleanup_queues(struct nullb *nullb)
{
int i;
for (i = 0; i < nullb->nr_queues; i++)
cleanup_queue(&nullb->queues[i]);
kfree(nullb->queues);
}
static void null_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
{
struct nullb_queue *nq = hctx->driver_data;
struct nullb *nullb = nq->dev->nullb;
nullb->nr_queues--;
}
static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq)
{
init_waitqueue_head(&nq->wait);
nq->queue_depth = nullb->queue_depth;
nq->dev = nullb->dev;
INIT_LIST_HEAD(&nq->poll_list);
spin_lock_init(&nq->poll_lock);
}
static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data,
unsigned int hctx_idx)
{
struct nullb *nullb = hctx->queue->queuedata;
struct nullb_queue *nq;
if (should_init_hctx_fail(nullb->dev))
return -EFAULT;
nq = &nullb->queues[hctx_idx];
hctx->driver_data = nq;
null_init_queue(nullb, nq);
nullb->nr_queues++;
return 0;
}
static const struct blk_mq_ops null_mq_ops = {
.queue_rq = null_queue_rq,
.complete = null_complete_rq,
.timeout = null_timeout_rq,
.poll = null_poll,
.map_queues = null_map_queues,
.init_hctx = null_init_hctx,
.exit_hctx = null_exit_hctx,
};
static void null_del_dev(struct nullb *nullb)
{
struct nullb_device *dev;
if (!nullb)
return;
dev = nullb->dev;
ida_free(&nullb_indexes, nullb->index);
list_del_init(&nullb->list);
del_gendisk(nullb->disk);
if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) {
hrtimer_cancel(&nullb->bw_timer);
atomic_long_set(&nullb->cur_bytes, LONG_MAX);
null_restart_queue_async(nullb);
}
put_disk(nullb->disk);
if (dev->queue_mode == NULL_Q_MQ &&
nullb->tag_set == &nullb->__tag_set)
blk_mq_free_tag_set(nullb->tag_set);
cleanup_queues(nullb);
if (null_cache_active(nullb))
null_free_device_storage(nullb->dev, true);
kfree(nullb);
dev->nullb = NULL;
}
static void null_config_discard(struct nullb *nullb)
{
if (nullb->dev->discard == false)
return;
if (!nullb->dev->memory_backed) {
nullb->dev->discard = false;
pr_info("discard option is ignored without memory backing\n");
return;
}
if (nullb->dev->zoned) {
nullb->dev->discard = false;
pr_info("discard option is ignored in zoned mode\n");
return;
}
nullb->q->limits.discard_granularity = nullb->dev->blocksize;
blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9);
}
static const struct block_device_operations null_bio_ops = {
.owner = THIS_MODULE,
.submit_bio = null_submit_bio,
.report_zones = null_report_zones,
};
static const struct block_device_operations null_rq_ops = {
.owner = THIS_MODULE,
.report_zones = null_report_zones,
};
static int setup_commands(struct nullb_queue *nq)
{
struct nullb_cmd *cmd;
int i;
nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL);
if (!nq->cmds)
return -ENOMEM;
nq->tag_map = bitmap_zalloc(nq->queue_depth, GFP_KERNEL);
if (!nq->tag_map) {
kfree(nq->cmds);
return -ENOMEM;
}
for (i = 0; i < nq->queue_depth; i++) {
cmd = &nq->cmds[i];
cmd->tag = -1U;
}
return 0;
}
static int setup_queues(struct nullb *nullb)
{
int nqueues = nr_cpu_ids;
if (g_poll_queues)
nqueues += g_poll_queues;
nullb->queues = kcalloc(nqueues, sizeof(struct nullb_queue),
GFP_KERNEL);
if (!nullb->queues)
return -ENOMEM;
nullb->queue_depth = nullb->dev->hw_queue_depth;
return 0;
}
static int init_driver_queues(struct nullb *nullb)
{
struct nullb_queue *nq;
int i, ret = 0;
for (i = 0; i < nullb->dev->submit_queues; i++) {
nq = &nullb->queues[i];
null_init_queue(nullb, nq);
ret = setup_commands(nq);
if (ret)
return ret;
nullb->nr_queues++;
}
return 0;
}
static int null_gendisk_register(struct nullb *nullb)
{
sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT;
struct gendisk *disk = nullb->disk;
set_capacity(disk, size);
disk->major = null_major;
disk->first_minor = nullb->index;
disk->minors = 1;
if (queue_is_mq(nullb->q))
disk->fops = &null_rq_ops;
else
disk->fops = &null_bio_ops;
disk->private_data = nullb;
strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN);
if (nullb->dev->zoned) {
int ret = null_register_zoned_dev(nullb);
if (ret)
return ret;
}
return add_disk(disk);
}
static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
{
unsigned int flags = BLK_MQ_F_SHOULD_MERGE;
int hw_queues, numa_node;
unsigned int queue_depth;
int poll_queues;
if (nullb) {
hw_queues = nullb->dev->submit_queues;
poll_queues = nullb->dev->poll_queues;
queue_depth = nullb->dev->hw_queue_depth;
numa_node = nullb->dev->home_node;
if (nullb->dev->no_sched)
flags |= BLK_MQ_F_NO_SCHED;
if (nullb->dev->shared_tag_bitmap)
flags |= BLK_MQ_F_TAG_HCTX_SHARED;
if (nullb->dev->blocking)
flags |= BLK_MQ_F_BLOCKING;
} else {
hw_queues = g_submit_queues;
poll_queues = g_poll_queues;
queue_depth = g_hw_queue_depth;
numa_node = g_home_node;
if (g_no_sched)
flags |= BLK_MQ_F_NO_SCHED;
if (g_shared_tag_bitmap)
flags |= BLK_MQ_F_TAG_HCTX_SHARED;
if (g_blocking)
flags |= BLK_MQ_F_BLOCKING;
}
set->ops = &null_mq_ops;
set->cmd_size = sizeof(struct nullb_cmd);
set->flags = flags;
set->driver_data = nullb;
set->nr_hw_queues = hw_queues;
set->queue_depth = queue_depth;
set->numa_node = numa_node;
if (poll_queues) {
set->nr_hw_queues += poll_queues;
set->nr_maps = 3;
} else {
set->nr_maps = 1;
}
return blk_mq_alloc_tag_set(set);
}
static int null_validate_conf(struct nullb_device *dev)
{
if (dev->queue_mode == NULL_Q_RQ) {
pr_err("legacy IO path is no longer available\n");
return -EINVAL;
}
if (blk_validate_block_size(dev->blocksize))
return -EINVAL;
if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) {
if (dev->submit_queues != nr_online_nodes)
dev->submit_queues = nr_online_nodes;
} else if (dev->submit_queues > nr_cpu_ids)
dev->submit_queues = nr_cpu_ids;
else if (dev->submit_queues == 0)
dev->submit_queues = 1;
dev->prev_submit_queues = dev->submit_queues;
if (dev->poll_queues > g_poll_queues)
dev->poll_queues = g_poll_queues;
dev->prev_poll_queues = dev->poll_queues;
dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ);
dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER);
/* Do memory allocation, so set blocking */
if (dev->memory_backed)
dev->blocking = true;
else /* cache is meaningless */
dev->cache_size = 0;
dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024,
dev->cache_size);
dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps);
/* can not stop a queue */
if (dev->queue_mode == NULL_Q_BIO)
dev->mbps = 0;
if (dev->zoned && !dev->zone_size) {
pr_err("Invalid zero zone size\n");
return -EINVAL;
}
return 0;
}
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
static bool __null_setup_fault(struct fault_attr *attr, char *str)
{
if (!str[0])
return true;
if (!setup_fault_attr(attr, str))
return false;
attr->verbose = 0;
return true;
}
#endif
static bool null_setup_fault(void)
{
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
if (!__null_setup_fault(&null_timeout_attr, g_timeout_str))
return false;
if (!__null_setup_fault(&null_requeue_attr, g_requeue_str))
return false;
if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str))
return false;
#endif
return true;
}
static int null_add_dev(struct nullb_device *dev)
{
struct nullb *nullb;
int rv;
rv = null_validate_conf(dev);
if (rv)
return rv;
nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node);
if (!nullb) {
rv = -ENOMEM;
goto out;
}
nullb->dev = dev;
dev->nullb = nullb;
spin_lock_init(&nullb->lock);
rv = setup_queues(nullb);
if (rv)
goto out_free_nullb;
if (dev->queue_mode == NULL_Q_MQ) {
if (shared_tags) {
nullb->tag_set = &tag_set;
rv = 0;
} else {
nullb->tag_set = &nullb->__tag_set;
rv = null_init_tag_set(nullb, nullb->tag_set);
}
if (rv)
goto out_cleanup_queues;
nullb->tag_set->timeout = 5 * HZ;
nullb->disk = blk_mq_alloc_disk(nullb->tag_set, nullb);
if (IS_ERR(nullb->disk)) {
rv = PTR_ERR(nullb->disk);
goto out_cleanup_tags;
}
nullb->q = nullb->disk->queue;
} else if (dev->queue_mode == NULL_Q_BIO) {
rv = -ENOMEM;
nullb->disk = blk_alloc_disk(nullb->dev->home_node);
if (!nullb->disk)
goto out_cleanup_queues;
nullb->q = nullb->disk->queue;
rv = init_driver_queues(nullb);
if (rv)
goto out_cleanup_disk;
}
if (dev->mbps) {
set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags);
nullb_setup_bwtimer(nullb);
}
if (dev->cache_size > 0) {
set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags);
blk_queue_write_cache(nullb->q, true, true);
}
if (dev->zoned) {
rv = null_init_zoned_dev(dev, nullb->q);
if (rv)
goto out_cleanup_disk;
}
nullb->q->queuedata = nullb;
blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q);
rv = ida_alloc(&nullb_indexes, GFP_KERNEL);
if (rv < 0)
goto out_cleanup_zone;
nullb->index = rv;
dev->index = rv;
blk_queue_logical_block_size(nullb->q, dev->blocksize);
blk_queue_physical_block_size(nullb->q, dev->blocksize);
if (dev->max_sectors)
blk_queue_max_hw_sectors(nullb->q, dev->max_sectors);
blk_queue_max_segment_size(nullb->q, dev->max_segment_size);
if (dev->virt_boundary)
blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1);
null_config_discard(nullb);
if (config_item_name(&dev->group.cg_item)) {
/* Use configfs dir name as the device name */
snprintf(nullb->disk_name, sizeof(nullb->disk_name),
"%s", config_item_name(&dev->group.cg_item));
} else {
sprintf(nullb->disk_name, "nullb%d", nullb->index);
}
rv = null_gendisk_register(nullb);
if (rv)
goto out_ida_free;
list_add_tail(&nullb->list, &nullb_list);
pr_info("disk %s created\n", nullb->disk_name);
return 0;
out_ida_free:
ida_free(&nullb_indexes, nullb->index);
out_cleanup_zone:
null_free_zoned_dev(dev);
out_cleanup_disk:
put_disk(nullb->disk);
out_cleanup_tags:
if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
blk_mq_free_tag_set(nullb->tag_set);
out_cleanup_queues:
cleanup_queues(nullb);
out_free_nullb:
kfree(nullb);
dev->nullb = NULL;
out:
return rv;
}
static struct nullb *null_find_dev_by_name(const char *name)
{
struct nullb *nullb = NULL, *nb;
mutex_lock(&lock);
list_for_each_entry(nb, &nullb_list, list) {
if (strcmp(nb->disk_name, name) == 0) {
nullb = nb;
break;
}
}
mutex_unlock(&lock);
return nullb;
}
static int null_create_dev(void)
{
struct nullb_device *dev;
int ret;
dev = null_alloc_dev();
if (!dev)
return -ENOMEM;
mutex_lock(&lock);
ret = null_add_dev(dev);
mutex_unlock(&lock);
if (ret) {
null_free_dev(dev);
return ret;
}
return 0;
}
static void null_destroy_dev(struct nullb *nullb)
{
struct nullb_device *dev = nullb->dev;
null_del_dev(nullb);
null_free_device_storage(dev, false);
null_free_dev(dev);
}
static int __init null_init(void)
{
int ret = 0;
unsigned int i;
struct nullb *nullb;
if (g_bs > PAGE_SIZE) {
pr_warn("invalid block size\n");
pr_warn("defaults block size to %lu\n", PAGE_SIZE);
g_bs = PAGE_SIZE;
}
if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) {
pr_err("invalid home_node value\n");
g_home_node = NUMA_NO_NODE;
}
if (!null_setup_fault())
return -EINVAL;
if (g_queue_mode == NULL_Q_RQ) {
pr_err("legacy IO path is no longer available\n");
return -EINVAL;
}
if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
if (g_submit_queues != nr_online_nodes) {
pr_warn("submit_queues param is set to %u.\n",
nr_online_nodes);
g_submit_queues = nr_online_nodes;
}
} else if (g_submit_queues > nr_cpu_ids) {
g_submit_queues = nr_cpu_ids;
} else if (g_submit_queues <= 0) {
g_submit_queues = 1;
}
if (g_queue_mode == NULL_Q_MQ && shared_tags) {
ret = null_init_tag_set(NULL, &tag_set);
if (ret)
return ret;
}
config_group_init(&nullb_subsys.su_group);
mutex_init(&nullb_subsys.su_mutex);
ret = configfs_register_subsystem(&nullb_subsys);
if (ret)
goto err_tagset;
mutex_init(&lock);
null_major = register_blkdev(0, "nullb");
if (null_major < 0) {
ret = null_major;
goto err_conf;
}
for (i = 0; i < nr_devices; i++) {
ret = null_create_dev();
if (ret)
goto err_dev;
}
pr_info("module loaded\n");
return 0;
err_dev:
while (!list_empty(&nullb_list)) {
nullb = list_entry(nullb_list.next, struct nullb, list);
null_destroy_dev(nullb);
}
unregister_blkdev(null_major, "nullb");
err_conf:
configfs_unregister_subsystem(&nullb_subsys);
err_tagset:
if (g_queue_mode == NULL_Q_MQ && shared_tags)
blk_mq_free_tag_set(&tag_set);
return ret;
}
static void __exit null_exit(void)
{
struct nullb *nullb;
configfs_unregister_subsystem(&nullb_subsys);
unregister_blkdev(null_major, "nullb");
mutex_lock(&lock);
while (!list_empty(&nullb_list)) {
nullb = list_entry(nullb_list.next, struct nullb, list);
null_destroy_dev(nullb);
}
mutex_unlock(&lock);
if (g_queue_mode == NULL_Q_MQ && shared_tags)
blk_mq_free_tag_set(&tag_set);
mutex_destroy(&lock);
}
module_init(null_init);
module_exit(null_exit);
MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>");
MODULE_DESCRIPTION("multi queue aware block test driver");
MODULE_LICENSE("GPL");