FM / linux

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux

Name	Size	Mode	Actions
amba/	-	0755	rm
avf/	-	0755	rm
bcma/	-	0755	rm
byteorder/	-	0755	rm
can/	-	0755	rm
ceph/	-	0755	rm
clk/	-	0755	rm
crush/	-	0755	rm
decompress/	-	0755	rm
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
hsi/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	0755	rm
mfd/	-	0755	rm
mlx4/	-	0755	rm
mlx5/	-	0755	rm
mmc/	-	0755	rm
mtd/	-	0755	rm
mux/	-	0755	rm
net/	-	0755	rm
netfilter/	-	0755	rm
netfilter_arp/	-	0755	rm
netfilter_bridge/	-	0755	rm
netfilter_ipv4/	-	0755	rm
netfilter_ipv6/	-	0755	rm
pcs/	-	0755	rm
perf/	-	0755	rm
phy/	-	0755	rm
pinctrl/	-	0755	rm
platform_data/	-	0755	rm
power/	-	0755	rm
qed/	-	0755	rm
raid/	-	0755	rm
regulator/	-	0755	rm
remoteproc/	-	0755	rm
reset/	-	0755	rm
rpmsg/	-	0755	rm
rtc/	-	0755	rm
sched/	-	0755	rm
soc/	-	0755	rm
soundwire/	-	0755	rm
spi/	-	0755	rm
ssb/	-	0755	rm
sunrpc/	-	0755	rm
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
uwb/	-	0755	rm
wimax/	-	0755	rm
8250_pci.h	1038	0644	edit dl rm
a.out.h	354	0644	edit dl rm
acct.h	2551	0644	edit dl rm
acpi.h	43130	0644	edit dl rm
acpi_apmt.h	367	0644	edit dl rm
acpi_dma.h	3300	0644	edit dl rm
acpi_iort.h	3235	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3908	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1772	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1875	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6931	0644	edit dl rm
amd-pstate.h	3356	0644	edit dl rm
anon_inodes.h	494	0644	edit dl rm
aperture.h	1619	0644	edit dl rm
apm-emulation.h	1575	0644	edit dl rm
apm_bios.h	2746	0644	edit dl rm
apple-gmux.h	1459	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	1983	0644	edit dl rm
arm-cci.h	2058	0644	edit dl rm
arm-smccc.h	16066	0644	edit dl rm
arm_sdei.h	2641	0644	edit dl rm
array_size.h	332	0644	edit dl rm
ascii85.h	532	0644	edit dl rm
asn1.h	2039	0644	edit dl rm
asn1_ber_bytecode.h	2783	0644	edit dl rm
asn1_decoder.h	675	0644	edit dl rm
assoc_array.h	3156	0644	edit dl rm
assoc_array_priv.h	5630	0644	edit dl rm
async.h	4591	0644	edit dl rm
async_tx.h	7487	0644	edit dl rm
ata.h	33980	0644	edit dl rm
atalk.h	4550	0644	edit dl rm
ata_platform.h	729	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10457	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1502	0644	edit dl rm
atmel_tc.h	11600	0644	edit dl rm
atm_suni.h	253	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	37546	0644	edit dl rm
attribute_container.h	2799	0644	edit dl rm
audit.h	20332	0644	edit dl rm
audit_arch.h	559	0644	edit dl rm
auto_dev-ioctl.h	454	0644	edit dl rm
auto_fs.h	436	0644	edit dl rm
auxiliary_bus.h	2787	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
b1pcmcia.h	666	0644	edit dl rm
backing-dev-defs.h	10327	0644	edit dl rm
backing-dev.h	12260	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	6745	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2660	0644	edit dl rm
bcm47xx_nvram.h	1247	0644	edit dl rm
bcm47xx_sprom.h	600	0644	edit dl rm
bcm47xx_wdt.h	555	0644	edit dl rm
bcm963xx_nvram.h	3036	0644	edit dl rm
bcm963xx_tag.h	3685	0644	edit dl rm
binfmts.h	5443	0644	edit dl rm
bio.h	20690	0644	edit dl rm
bitfield.h	5899	0644	edit dl rm
bitmap.h	21496	0644	edit dl rm
bitops.h	8870	0644	edit dl rm
bitrev.h	2541	0644	edit dl rm
bits.h	1512	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22728	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	234	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	16074	0644	edit dl rm
blk-pm.h	717	0644	edit dl rm
blkdev.h	58898	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3777	0644	edit dl rm
blk_types.h	15342	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1938	0644	edit dl rm
bottom_half.h	803	0644	edit dl rm
bpf-cgroup.h	19818	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	73387	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	1733	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5349	0644	edit dl rm
bpf_lsm.h	1431	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5395	0644	edit dl rm
bpf_verifier.h	18791	0644	edit dl rm
brcmphy.h	14023	0644	edit dl rm
bsearch.h	275	0644	edit dl rm
bsg-lib.h	2455	0644	edit dl rm
bsg.h	1094	0644	edit dl rm
btf.h	7363	0644	edit dl rm
btf_ids.h	5174	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	6999	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14379	0644	edit dl rm
bug.h	1967	0644	edit dl rm
buildid.h	248	0644	edit dl rm
build_bug.h	3066	0644	edit dl rm
bvec.h	4119	0644	edit dl rm
c2port.h	1529	0644	edit dl rm
cache.h	2182	0644	edit dl rm
cacheinfo.h	4796	0644	edit dl rm
capability.h	8179	0644	edit dl rm
cb710.h	5827	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18697	0644	edit dl rm
cc_platform.h	3140	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9193	0644	edit dl rm
cfag12864b.h	1499	0644	edit dl rm
cgroup-defs.h	27242	0644	edit dl rm
cgroup.h	28880	0644	edit dl rm
cgroup_rdma.h	1358	0644	edit dl rm
cgroup_subsys.h	1259	0644	edit dl rm
circ_buf.h	1120	0644	edit dl rm
cleancache.h	3982	0644	edit dl rm
cleanup.h	14215	0644	edit dl rm
clk-provider.h	37542	0644	edit dl rm
clk.h	25157	0644	edit dl rm
clkdev.h	1698	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	9188	0644	edit dl rm
clock_cooling.h	2106	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	1212	0644	edit dl rm
cmdline-parser.h	1238	0644	edit dl rm
cnt32_to_63.h	3691	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2244	0644	edit dl rm
coda_psdev.h	2692	0644	edit dl rm
compaction.h	7654	0644	edit dl rm
compat.h	35739	0644	edit dl rm
compat_time.h	499	0644	edit dl rm
compiler-clang.h	2446	0644	edit dl rm
compiler-gcc.h	5756	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler.h	15718	0644	edit dl rm
compiler_attributes.h	10600	0644	edit dl rm
compiler_types.h	6931	0644	edit dl rm
completion.h	4201	0644	edit dl rm
component.h	4459	0644	edit dl rm
concap.h	3778	0644	edit dl rm
configfs.h	9441	0644	edit dl rm
connector.h	2490	0644	edit dl rm
console.h	7504	0644	edit dl rm
consolemap.h	1068	0644	edit dl rm
console_struct.h	6966	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	668	0644	edit dl rm
container_of.h	1278	0644	edit dl rm
context_tracking.h	5168	0644	edit dl rm
context_tracking_state.h	1529	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	1794	0644	edit dl rm
coredump.h	797	0644	edit dl rm
coresight-pmu.h	989	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	9676	0644	edit dl rm
counter.h	15497	0644	edit dl rm
counter_enum.h	1463	0644	edit dl rm
count_zeros.h	1660	0644	edit dl rm
cper.h	16826	0644	edit dl rm
cpu.h	7959	0644	edit dl rm
cpufeature.h	1882	0644	edit dl rm
cpufreq.h	34248	0644	edit dl rm
cpuhotplug.h	14269	0644	edit dl rm
cpuidle.h	13061	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	29721	0644	edit dl rm
cpuset.h	8297	0644	edit dl rm
cpu_cooling.h	2389	0644	edit dl rm
cpu_pm.h	2850	0644	edit dl rm
cpu_rmap.h	1902	0644	edit dl rm
crash_core.h	3292	0644	edit dl rm
crash_dump.h	5193	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	613	0644	edit dl rm
crc-t10dif.h	453	0644	edit dl rm
crc4.h	192	0644	edit dl rm
crc7.h	316	0644	edit dl rm
crc8.h	3747	0644	edit dl rm
crc16.h	622	0644	edit dl rm
crc32.h	2894	0644	edit dl rm
crc32c.h	331	0644	edit dl rm
crc32poly.h	610	0644	edit dl rm
cred.h	12749	0644	edit dl rm
crypto.h	59393	0644	edit dl rm
cryptohash.h	546	0644	edit dl rm
cs5535.h	6426	0644	edit dl rm
ctype.h	1791	0644	edit dl rm
cuda.h	501	0644	edit dl rm
cxl_err.h	468	0644	edit dl rm
cyclades.h	10607	0644	edit dl rm
damon.h	19616	0644	edit dl rm
davinci_emac.h	1150	0644	edit dl rm
dax.h	7553	0644	edit dl rm
dca.h	2698	0644	edit dl rm
dcache.h	19621	0644	edit dl rm
dccp.h	10989	0644	edit dl rm
dcookies.h	1329	0644	edit dl rm
debugfs.h	11921	0644	edit dl rm
debugobjects.h	3988	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2335	0644	edit dl rm
delayacct.h	6285	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
dell-led.h	128	0644	edit dl rm
devcoredump.h	2849	0644	edit dl rm
devfreq-event.h	5778	0644	edit dl rm
devfreq.h	12987	0644	edit dl rm
devfreq_cooling.h	3608	0644	edit dl rm
device-mapper.h	19529	0644	edit dl rm
device.h	67275	0644	edit dl rm
device_cgroup.h	1680	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1314	0644	edit dl rm
dev_printk.h	7731	0644	edit dl rm
digsig.h	1379	0644	edit dl rm
dim.h	8951	0644	edit dl rm
dio.h	11229	0644	edit dl rm
dirent.h	216	0644	edit dl rm
dlm.h	7240	0644	edit dl rm
dlm_plock.h	678	0644	edit dl rm
dm-bufio.h	4574	0644	edit dl rm
dm-dirty-log.h	4038	0644	edit dl rm
dm-io.h	1980	0644	edit dl rm
dm-kcopyd.h	3013	0644	edit dl rm
dm-region-hash.h	3182	0644	edit dl rm
dm9000.h	1136	0644	edit dl rm
dma-buf.h	21547	0644	edit dl rm
dma-contiguous.h	5070	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2983	0644	edit dl rm
dma-fence-chain.h	3576	0644	edit dl rm
dma-fence-unwrap.h	2298	0644	edit dl rm
dma-fence.h	21162	0644	edit dl rm
dma-iommu.h	3020	0644	edit dl rm
dma-map-ops.h	10863	0644	edit dl rm
dma-mapping.h	23170	0644	edit dl rm
dma-resv.h	17245	0644	edit dl rm
dmaengine.h	54891	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	8791	0644	edit dl rm
dmi.h	4375	0644	edit dl rm
dnotify.h	1047	0644	edit dl rm
dns_resolver.h	1339	0644	edit dl rm
dqblk_qtree.h	2238	0644	edit dl rm
dqblk_v1.h	327	0644	edit dl rm
dqblk_v2.h	406	0644	edit dl rm
drbd.h	10923	0644	edit dl rm
drbd_genl.h	22010	0644	edit dl rm
drbd_genl_api.h	1808	0644	edit dl rm
drbd_limits.h	8003	0644	edit dl rm
ds2782_battery.h	158	0644	edit dl rm
dtlk.h	3584	0644	edit dl rm
dw_apb_timer.h	1743	0644	edit dl rm
dynamic_debug.h	5831	0644	edit dl rm
dynamic_queue_limits.h	3812	0644	edit dl rm
earlycpio.h	359	0644	edit dl rm
ecryptfs.h	3915	0644	edit dl rm
edac.h	20718	0644	edit dl rm
edd.h	1469	0644	edit dl rm
edma.h	807	0644	edit dl rm
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eeprom_93xx46.h	776	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	62813	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	6059	0644	edit dl rm
elf-fdpic.h	2237	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	1565	0644	edit dl rm
elfcore-compat.h	1267	0644	edit dl rm
elfcore.h	2160	0644	edit dl rm
elfnote.h	3625	0644	edit dl rm
enclosure.h	4711	0644	edit dl rm
energy_model.h	5994	0644	edit dl rm
err.h	1583	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1424	0644	edit dl rm
error-injection.h	607	0644	edit dl rm
errqueue.h	524	0644	edit dl rm
errseq.h	382	0644	edit dl rm
etherdevice.h	16917	0644	edit dl rm
ethtool.h	35580	0644	edit dl rm
ethtool_netlink.h	1920	0644	edit dl rm
eventfd.h	2167	0644	edit dl rm
eventpoll.h	2457	0644	edit dl rm
evm.h	2985	0644	edit dl rm
export.h	3697	0644	edit dl rm
exportfs.h	7692	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	4431	0644	edit dl rm
extcon.h	10270	0644	edit dl rm
f2fs_fs.h	18526	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1719	0644	edit dl rm
fanotify.h	2336	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28712	0644	edit dl rm
fbcon.h	2136	0644	edit dl rm
fcdevice.h	988	0644	edit dl rm
fcntl.h	1808	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	1044	0644	edit dl rm
fdtable.h	3616	0644	edit dl rm
fec.h	609	0644	edit dl rm
file.h	3147	0644	edit dl rm
filter.h	42781	0644	edit dl rm
fips.h	167	0644	edit dl rm
firewire.h	13868	0644	edit dl rm
firmware-map.h	1351	0644	edit dl rm
firmware.h	5874	0644	edit dl rm
fixp-arith.h	4516	0644	edit dl rm
flat.h	1653	0644	edit dl rm
flex_array.h	4412	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
fmc-sdb.h	1319	0644	edit dl rm
fmc.h	9877	0644	edit dl rm
font.h	1598	0644	edit dl rm
fortify-string.h	16550	0644	edit dl rm
freezer.h	9257	0644	edit dl rm
frontswap.h	3121	0644	edit dl rm
fs.h	118914	0644	edit dl rm
fscache-cache.h	19254	0644	edit dl rm
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fsi.h	2424	0644	edit dl rm
fsl-diu-fb.h	4179	0644	edit dl rm
fsldma.h	398	0644	edit dl rm
fsl_devices.h	4430	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25658	0644	edit dl rm
fsnotify.h	7796	0644	edit dl rm
fsnotify_backend.h	20665	0644	edit dl rm
fs_context.h	9097	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4750	0644	edit dl rm
fs_pin.h	619	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1751	0644	edit dl rm
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gcd.h	193	0644	edit dl rm
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genetlink.h	1379	0644	edit dl rm
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getcpu.h	641	0644	edit dl rm
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goldfish.h	605	0644	edit dl rm
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gpio.h	5478	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
hardirq.h	3264	0644	edit dl rm
hash.h	2998	0644	edit dl rm
hashtable.h	6805	0644	edit dl rm
hdlc.h	3413	0644	edit dl rm
hdlcdrv.h	6470	0644	edit dl rm
hdmi.h	12851	0644	edit dl rm
hid-debug.h	1458	0644	edit dl rm
hid-roccat.h	484	0644	edit dl rm
hid-sensor-hub.h	9190	0644	edit dl rm
hid-sensor-ids.h	7617	0644	edit dl rm
hid.h	38339	0644	edit dl rm
hidden.h	966	0644	edit dl rm
hiddev.h	1458	0644	edit dl rm
hidraw.h	1146	0644	edit dl rm
highmem-internal.h	4952	0644	edit dl rm
highmem.h	8235	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5249	0644	edit dl rm
hippidevice.h	1263	0644	edit dl rm
hmm.h	4656	0644	edit dl rm
host1x.h	8618	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16651	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	27496	0644	edit dl rm
hugetlb_cgroup.h	7056	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
huge_mm.h	15743	0644	edit dl rm
hwmon-sysfs.h	2024	0644	edit dl rm
hwmon-vid.h	1518	0644	edit dl rm
hwmon.h	14084	0644	edit dl rm
hwspinlock.h	13044	0644	edit dl rm
hw_breakpoint.h	4405	0644	edit dl rm
hw_random.h	2377	0644	edit dl rm
hyperv.h	50010	0644	edit dl rm
hypervisor.h	748	0644	edit dl rm
i2c-algo-bit.h	2322	0644	edit dl rm
i2c-algo-pca.h	2599	0644	edit dl rm
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Edit: /usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/blkdev.h (58898B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BLKDEV_H
#define _LINUX_BLKDEV_H

#include <linux/sched.h>
#include <linux/sched/clock.h>

#ifdef CONFIG_BLOCK

#include <linux/major.h>
#include <linux/genhd.h>
#include <linux/list.h>
#include <linux/llist.h>
#include <linux/minmax.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/pagemap.h>
#include <linux/backing-dev-defs.h>
#include <linux/wait.h>
#include <linux/mempool.h>
#include <linux/pfn.h>
#include <linux/bio.h>
#include <linux/stringify.h>
#include <linux/gfp.h>
#include <linux/bsg.h>
#include <linux/smp.h>
#include <linux/rcupdate.h>
#include <linux/percpu-refcount.h>
#include <linux/scatterlist.h>
#include <linux/blkzoned.h>
#include <linux/pm.h>
#include <linux/sbitmap.h>

struct module;
struct scsi_ioctl_command;

struct request_queue;
struct elevator_queue;
struct blk_trace;
struct request;
struct sg_io_hdr;
struct bsg_job;
struct blkcg_gq;
struct blk_flush_queue;
struct pr_ops;
struct rq_qos;
struct blk_queue_stats;
struct blk_stat_callback;

#define BLKDEV_MIN_RQ	4
#define BLKDEV_MAX_RQ	128	/* Default maximum */

/* Must be consistent with blk_mq_poll_stats_bkt() */
#define BLK_MQ_POLL_STATS_BKTS 16

/* Doing classic polling */
#define BLK_MQ_POLL_CLASSIC -1

/*
 * Maximum number of blkcg policies allowed to be registered concurrently.
 * Defined here to simplify include dependency.
 */
#define BLKCG_MAX_POLS		5

typedef void (rq_end_io_fn)(struct request *, blk_status_t);

/*
 * request flags */
typedef __u32 __bitwise req_flags_t;

/* drive already may have started this one */
#define RQF_STARTED		((__force req_flags_t)(1 << 1))
/* may not be passed by ioscheduler */
#define RQF_SOFTBARRIER		((__force req_flags_t)(1 << 3))
/* request for flush sequence */
#define RQF_FLUSH_SEQ		((__force req_flags_t)(1 << 4))
/* merge of different types, fail separately */
#define RQF_MIXED_MERGE		((__force req_flags_t)(1 << 5))
/* track inflight for MQ */
#define RQF_MQ_INFLIGHT		((__force req_flags_t)(1 << 6))
/* don't call prep for this one */
#define RQF_DONTPREP		((__force req_flags_t)(1 << 7))
/* set for "ide_preempt" requests and also for requests for which the SCSI
   "quiesce" state must be ignored. */
#define RQF_PREEMPT		((__force req_flags_t)(1 << 8))
/* vaguely specified driver internal error.  Ignored by the block layer */
#define RQF_FAILED		((__force req_flags_t)(1 << 10))
/* don't warn about errors */
#define RQF_QUIET		((__force req_flags_t)(1 << 11))
/* elevator private data attached */
#define RQF_ELVPRIV		((__force req_flags_t)(1 << 12))
/* account I/O stat */
#define RQF_IO_STAT		((__force req_flags_t)(1 << 13))
/* request came from our alloc pool */
#define RQF_ALLOCED		((__force req_flags_t)(1 << 14))
/* runtime pm request */
#define RQF_PM			((__force req_flags_t)(1 << 15))
/* on IO scheduler merge hash */
#define RQF_HASHED		((__force req_flags_t)(1 << 16))
/* IO stats tracking on */
#define RQF_STATS		((__force req_flags_t)(1 << 17))
/* Look at ->special_vec for the actual data payload instead of the
   bio chain. */
#define RQF_SPECIAL_PAYLOAD	((__force req_flags_t)(1 << 18))
/* The per-zone write lock is held for this request */
#define RQF_ZONE_WRITE_LOCKED	((__force req_flags_t)(1 << 19))
/* already slept for hybrid poll */
#define RQF_MQ_POLL_SLEPT	((__force req_flags_t)(1 << 20))
/* ->timeout has been called, don't expire again */
#define RQF_TIMED_OUT		((__force req_flags_t)(1 << 21))

/* flags that prevent us from merging requests: */
#define RQF_NOMERGE_FLAGS \
	(RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)

/*
 * Request state for blk-mq.
 */
enum mq_rq_state {
	MQ_RQ_IDLE		= 0,
	MQ_RQ_IN_FLIGHT		= 1,
	MQ_RQ_COMPLETE		= 2,
};

struct request_aux {
	u64 alloc_time_ns;
	unsigned short stats_sectors;
};

/*
 * Try to put the fields that are referenced together in the same cacheline.
 *
 * If you modify this structure, make sure to update blk_rq_init() and
 * especially blk_mq_rq_ctx_init() to take care of the added fields.
 */
struct request {
	struct request_queue *q;
	struct blk_mq_ctx *mq_ctx;
	struct blk_mq_hw_ctx *mq_hctx;

unsigned int cmd_flags;		/* op and common flags */
	req_flags_t rq_flags;

int internal_tag;

/* the following two fields are internal, NEVER access directly */
	unsigned int __data_len;	/* total data len */
	int tag;
	sector_t __sector;		/* sector cursor */

struct bio *bio;
	struct bio *biotail;

struct list_head queuelist;

/*
	 * The hash is used inside the scheduler, and killed once the
	 * request reaches the dispatch list. The ipi_list is only used
	 * to queue the request for softirq completion, which is long
	 * after the request has been unhashed (and even removed from
	 * the dispatch list).
	 */
	union {
		struct hlist_node hash;	/* merge hash */
		RH_KABI_REPLACE(struct list_head ipi_list, struct llist_node ipi_list)
	};

/*
	 * The rb_node is only used inside the io scheduler, requests
	 * are pruned when moved to the dispatch queue. So let the
	 * completion_data share space with the rb_node.
	 */
	union {
		struct rb_node rb_node;	/* sort/lookup */
		struct bio_vec special_vec;
		void *completion_data;
		int error_count; /* for legacy drivers, don't use */
	};

/*
	 * Three pointers are available for the IO schedulers, if they need
	 * more they have to dynamically allocate it.  Flush requests are
	 * never put on the IO scheduler. So let the flush fields share
	 * space with the elevator data.
	 */
	union {
		struct {
			struct io_cq		*icq;
			void			*priv[2];
		} elv;

struct {
			unsigned int		seq;
			struct list_head	list;
			rq_end_io_fn		*saved_end_io;
		} flush;
	};

struct gendisk *rq_disk;
	struct hd_struct *part;
	/* Time that this request was allocated for this IO. */
	u64 start_time_ns;
	/* Time that I/O was submitted to the device. */
	u64 io_start_time_ns;

#ifdef CONFIG_BLK_WBT
	unsigned short wbt_flags;
#endif
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	RH_KABI_DEPRECATE(unsigned short, throtl_size)
#endif
	/*
	 * Number of scatter-gather DMA addr+len pairs after
	 * physical address coalescing is performed.
	 */
	unsigned short nr_phys_segments;

#if defined(CONFIG_BLK_DEV_INTEGRITY)
	unsigned short nr_integrity_segments;
#endif

unsigned short write_hint;
	unsigned short ioprio;

RH_KABI_DEPRECATE(void *, special)          /* opaque pointer available for LLD use */

unsigned int extra_len;	/* length of alignment and padding */

enum mq_rq_state state;
	refcount_t ref;

unsigned int timeout;
	unsigned long deadline;

union {
		struct __call_single_data csd;
		u64 fifo_time;
	};

/*
	 * completion callback.
	 */
	rq_end_io_fn *end_io;
	void *end_io_data;

/* for bidi */
	RH_KABI_DEPRECATE(struct request *, next_rq)
};

extern struct request_aux *blk_rq_aux(const struct request *rq);

static inline bool blk_op_is_scsi(unsigned int op)
{
	return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
}

static inline bool blk_op_is_private(unsigned int op)
{
	return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
}

static inline bool blk_rq_is_scsi(struct request *rq)
{
	return blk_op_is_scsi(req_op(rq));
}

static inline bool blk_rq_is_private(struct request *rq)
{
	return blk_op_is_private(req_op(rq));
}

static inline bool blk_rq_is_passthrough(struct request *rq)
{
	return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
}

static inline bool bio_is_passthrough(struct bio *bio)
{
	unsigned op = bio_op(bio);

return blk_op_is_scsi(op) || blk_op_is_private(op);
}

static inline bool blk_op_is_passthrough(unsigned int op)
{
	return (blk_op_is_scsi(op & REQ_OP_MASK) ||
			blk_op_is_private(op & REQ_OP_MASK));
}

static inline unsigned short req_get_ioprio(struct request *req)
{
	return req->ioprio;
}

#include <linux/elevator.h>

struct blk_queue_ctx;

typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);

struct bio_vec;
typedef int (dma_drain_needed_fn)(struct request *);

enum blk_eh_timer_return {
	BLK_EH_DONE,		/* drivers has completed the command */
	BLK_EH_RESET_TIMER,	/* reset timer and try again */
};

enum blk_queue_state {
	Queue_down,
	Queue_up,
};

#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */

#define BLK_SCSI_MAX_CMDS	(256)
#define BLK_SCSI_CMD_PER_LONG	(BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))

/*
 * Zoned block device models (zoned limit).
 */
enum blk_zoned_model {
	BLK_ZONED_NONE,	/* Regular block device */
	BLK_ZONED_HA,	/* Host-aware zoned block device */
	BLK_ZONED_HM,	/* Host-managed zoned block device */
};

struct queue_limits {
	unsigned long		bounce_pfn;
	unsigned long		seg_boundary_mask;
	unsigned long		virt_boundary_mask;

unsigned int		max_hw_sectors;
	unsigned int		max_dev_sectors;
	unsigned int		chunk_sectors;
	unsigned int		max_sectors;
	unsigned int		max_segment_size;
	unsigned int		physical_block_size;
	unsigned int		alignment_offset;
	unsigned int		io_min;
	unsigned int		io_opt;
	unsigned int		max_discard_sectors;
	unsigned int		max_hw_discard_sectors;
	unsigned int		max_write_same_sectors;
	unsigned int		max_write_zeroes_sectors;
	unsigned int		discard_granularity;
	unsigned int		discard_alignment;

unsigned short		logical_block_size;
	unsigned short		max_segments;
	unsigned short		max_integrity_segments;
	unsigned short		max_discard_segments;

unsigned char		misaligned;
	unsigned char		discard_misaligned;
	unsigned char		cluster;
	unsigned char		raid_partial_stripes_expensive;
	enum blk_zoned_model	zoned;

RH_KABI_USE(1, unsigned int		max_zone_append_sectors)

RH_KABI_RESERVE(2)
	RH_KABI_RESERVE(3)
	RH_KABI_RESERVE(4)
	RH_KABI_RESERVE(5)
	RH_KABI_RESERVE(6)
	RH_KABI_RESERVE(7)
	RH_KABI_RESERVE(8)
};

typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
			       void *data);

void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model);

#ifdef CONFIG_BLK_DEV_ZONED

#define BLK_ALL_ZONES  ((unsigned int)-1)
int blkdev_report_zones(struct block_device *bdev, sector_t sector,
			unsigned int nr_zones, report_zones_cb cb, void *data);
unsigned int blkdev_nr_zones(struct gendisk *disk);
extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
			    sector_t sectors, sector_t nr_sectors,
			    gfp_t gfp_mask);
int blk_revalidate_disk_zones(struct gendisk *disk,
			      void (*update_driver_data)(struct gendisk *disk));

extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
				     unsigned int cmd, unsigned long arg);
extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
				  unsigned int cmd, unsigned long arg);

#else /* CONFIG_BLK_DEV_ZONED */

static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
{
	return 0;
}

static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
					    fmode_t mode, unsigned int cmd,
					    unsigned long arg)
{
	return -ENOTTY;
}

static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
					 fmode_t mode, unsigned int cmd,
					 unsigned long arg)
{
	return -ENOTTY;
}

#endif /* CONFIG_BLK_DEV_ZONED */

struct request_queue {
	/*
	 * Together with queue_head for cacheline sharing
	 */
	RH_KABI_DEPRECATE(struct list_head,	queue_head)
	struct request		*last_merge;
	struct elevator_queue	*elevator;

struct blk_queue_stats	*stats;
	struct rq_qos		*rq_qos;

make_request_fn		*make_request_fn;
	dma_drain_needed_fn	*dma_drain_needed;

const struct blk_mq_ops	*mq_ops;

/* sw queues */
	struct blk_mq_ctx __percpu	*queue_ctx;
	RH_KABI_DEPRECATE(unsigned int,            nr_queues)

unsigned int		queue_depth;

/* hw dispatch queues */
	struct blk_mq_hw_ctx	**queue_hw_ctx;
	unsigned int		nr_hw_queues;

struct backing_dev_info	*backing_dev_info;

/*
	 * The queue owner gets to use this for whatever they like.
	 * ll_rw_blk doesn't touch it.
	 */
	void			*queuedata;

/*
	 * various queue flags, see QUEUE_* below
	 */
	unsigned long		queue_flags;
	/*
	 * Number of contexts that have called blk_set_pm_only(). If this
	 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
	 * processed.
	 */
	atomic_t		pm_only;

/*
	 * ida allocated id for this queue.  Used to index queues from
	 * ioctx.
	 */
	int			id;

/*
	 * queue needs bounce pages for pages above this limit
	 */
	gfp_t			bounce_gfp;

spinlock_t		queue_lock;

/*
	 * queue kobject
	 */
	struct kobject kobj;

/*
	 * mq queue kobject
	 */
	struct kobject *mq_kobj;

#ifdef  CONFIG_BLK_DEV_INTEGRITY
	struct blk_integrity integrity;
#endif	/* CONFIG_BLK_DEV_INTEGRITY */

#ifdef CONFIG_PM
	struct device		*dev;
	RH_KABI_REPLACE(int	rpm_status, enum rpm_status rpm_status)
	RH_KABI_DEPRECATE(unsigned int,		nr_pending)
#endif

/*
	 * queue settings
	 */
	unsigned long		nr_requests;	/* Max # of requests */

unsigned int		dma_drain_size;
	void			*dma_drain_buffer;
	unsigned int		dma_pad_mask;
	unsigned int		dma_alignment;

unsigned int		rq_timeout;
	int			poll_nsec;

struct blk_stat_callback	*poll_cb;
	struct blk_rq_stat	poll_stat[BLK_MQ_POLL_STATS_BKTS];

struct timer_list	timeout;
	struct work_struct	timeout_work;

struct list_head	icq_list;
#ifdef CONFIG_BLK_CGROUP
	DECLARE_BITMAP		(blkcg_pols, BLKCG_MAX_POLS);
	struct blkcg_gq		*root_blkg;
	struct list_head	blkg_list;
#endif

struct queue_limits	limits;

#if 1 /* CONFIG_BLK_DEV_ZONED */
	/*
	 * Zoned block device information for request dispatch control.
	 * nr_zones is the total number of zones of the device. This is always
	 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
	 * bits which indicates if a zone is conventional (bit set) or
	 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
	 * bits which indicates if a zone is write locked, that is, if a write
	 * request targeting the zone was dispatched. All three fields are
	 * initialized by the low level device driver (e.g. scsi/sd.c).
	 * Stacking drivers (device mappers) may or may not initialize
	 * these fields.
	 *
	 * Reads of this information must be protected with blk_queue_enter() /
	 * blk_queue_exit(). Modifying this information is only allowed while
	 * no requests are being processed. See also blk_mq_freeze_queue() and
	 * blk_mq_unfreeze_queue().
	 */
	unsigned int		nr_zones;
	RH_KABI_REPLACE(unsigned long   *seq_zones_bitmap,
			unsigned long           *conv_zones_bitmap)

unsigned long		*seq_zones_wlock;
#endif /* CONFIG_BLK_DEV_ZONED */

/*
	 * sg stuff
	 */
	unsigned int		sg_timeout;
	unsigned int		sg_reserved_size;
	int			node;
#ifdef CONFIG_BLK_DEV_IO_TRACE
	struct blk_trace RH_KABI_ADD_MODIFIER(__rcu) *blk_trace;
	struct mutex		blk_trace_mutex;
#endif
	/*
	 * for flush operations
	 */
	struct blk_flush_queue	*fq;

struct list_head	requeue_list;
	spinlock_t		requeue_lock;
	struct delayed_work	requeue_work;

struct mutex		sysfs_lock;

RH_KABI_REPLACE(atomic_t                mq_freeze_depth,
			int			mq_freeze_depth)

#if defined(CONFIG_BLK_DEV_BSG)
	struct bsg_class_device bsg_dev;
#endif

#ifdef CONFIG_BLK_DEV_THROTTLING
	/* Throttle data */
	struct throtl_data *td;
#endif
	struct rcu_head		rcu_head;
	wait_queue_head_t	mq_freeze_wq;
	struct percpu_ref	q_usage_counter;
	RH_KABI_DEPRECATE(struct list_head, all_q_node)

struct blk_mq_tag_set	*tag_set;
	struct list_head	tag_set_list;
	struct bio_set		bio_split;

#ifdef CONFIG_BLK_DEBUG_FS
	struct dentry		*debugfs_dir;
	struct dentry		*sched_debugfs_dir;
#endif

bool			mq_sysfs_init_done;

size_t			cmd_size;

RH_KABI_DEPRECATE(struct work_struct,      release_work)

#define BLK_MAX_WRITE_HINTS	5
	u64			write_hints[BLK_MAX_WRITE_HINTS];

/*
	 * for reusing dead hctx instance in case of updating
	 * nr_hw_queues
	 */
	RH_KABI_EXTEND(struct list_head	unused_hctx_list)
	RH_KABI_EXTEND(spinlock_t	unused_hctx_lock)
	/*
	 * Protect concurrent access to q_usage_counter by
	 * percpu_ref_kill() and percpu_ref_reinit().
	 */
	RH_KABI_EXTEND(struct mutex		mq_freeze_lock)

RH_KABI_EXTEND(struct mutex		sysfs_dir_lock)

RH_KABI_EXTEND(struct dentry		*rqos_debugfs_dir)

RH_KABI_EXTEND(unsigned int	required_elevator_features)

RH_KABI_EXTEND(struct mutex		debugfs_mutex)

RH_KABI_EXTEND(atomic_t		nr_active_requests_shared_sbitmap)

RH_KABI_EXTEND(struct sbitmap_queue	sched_bitmap_tags)
	RH_KABI_EXTEND(struct sbitmap_queue	sched_breserved_tags)
	RH_KABI_EXTEND(int			quiesce_depth)
};

/* Keep blk_queue_flag_name[] in sync with the definitions below */
#define QUEUE_FLAG_STOPPED	1	/* queue is stopped */
#define QUEUE_FLAG_DYING	2	/* queue being torn down */
#define QUEUE_FLAG_HCTX_ACTIVE  3	/* at least one blk-mq hctx is active */
#define QUEUE_FLAG_NOMERGES     5	/* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP	6	/* complete on same CPU-group */
#define QUEUE_FLAG_FAIL_IO	7	/* fake timeout */
#define QUEUE_FLAG_UNPRIV_SGIO  8	/* SG_IO free for unprivileged users */
#define QUEUE_FLAG_NONROT	9	/* non-rotational device (SSD) */
#define QUEUE_FLAG_VIRT        QUEUE_FLAG_NONROT /* paravirt device */
#define QUEUE_FLAG_IO_STAT     10	/* do IO stats */
#define QUEUE_FLAG_DISCARD     11	/* supports DISCARD */
#define QUEUE_FLAG_NOXMERGES   12	/* No extended merges */
#define QUEUE_FLAG_ADD_RANDOM  13	/* Contributes to random pool */
#define QUEUE_FLAG_SECERASE    14	/* supports secure erase */
#define QUEUE_FLAG_SAME_FORCE  15	/* force complete on same CPU */
#define QUEUE_FLAG_DEAD        16	/* queue tear-down finished */
#define QUEUE_FLAG_INIT_DONE   17	/* queue is initialized */
#define QUEUE_FLAG_NO_SG_MERGE 18	/* don't attempt to merge SG segments (obsolete) */
#define QUEUE_FLAG_POLL	       19	/* IO polling enabled if set */
#define QUEUE_FLAG_WC	       20	/* Write back caching */
#define QUEUE_FLAG_FUA	       21	/* device supports FUA writes */
#define QUEUE_FLAG_RQ_ALLOC_TIME 22	/* record rq->alloc_time_ns */
#define QUEUE_FLAG_DAX         23	/* device supports DAX */
#define QUEUE_FLAG_STATS       24	/* track rq completion times */
#define QUEUE_FLAG_POLL_STATS  25	/* collecting stats for hybrid polling */
#define QUEUE_FLAG_REGISTERED  26	/* queue has been registered to a disk */
#define QUEUE_FLAG_SCSI_PASSTHROUGH 27	/* queue supports SCSI commands */
#define QUEUE_FLAG_QUIESCED    28	/* queue has been quiesced */
#define QUEUE_FLAG_PCI_P2PDMA  29	/* device supports PCI p2p requests */
#define QUEUE_FLAG_ZONE_RESETALL 30	/* supports Zone Reset All */
#define QUEUE_FLAG_NOWAIT      31	/* device supports NOWAIT */
#define QUEUE_FLAG_STABLE_WRITES 32	/* don't modify blks until WB is done */
#define QUEUE_FLAG_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
				 (1 << QUEUE_FLAG_SAME_COMP)	|	\
				 (1 << QUEUE_FLAG_ADD_RANDOM))

#define QUEUE_FLAG_MQ_DEFAULT	((1UL << QUEUE_FLAG_IO_STAT) |		\
				 (1UL << QUEUE_FLAG_SAME_COMP) |	\
				 (1UL << QUEUE_FLAG_NOWAIT))

void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);

#define blk_queue_stopped(q)	test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_dying(q)	test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
#define blk_queue_dead(q)	test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
#define blk_queue_init_done(q)	test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
#define blk_queue_nomerges(q)	test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_noxmerges(q)	\
	test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
#define blk_queue_unpriv_sgio(q) \
	test_bit(QUEUE_FLAG_UNPRIV_SGIO, &(q)->queue_flags)
#define blk_queue_nonrot(q)	test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
#define blk_queue_stable_writes(q) \
	test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
#define blk_queue_io_stat(q)	test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_add_random(q)	test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
#define blk_queue_discard(q)	test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
#define blk_queue_zone_resetall(q)	\
	test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
#define blk_queue_secure_erase(q) \
	(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
#define blk_queue_dax(q)	test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
#define blk_queue_scsi_passthrough(q)	\
	test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
#define blk_queue_pci_p2pdma(q)	\
	test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
#ifdef CONFIG_BLK_RQ_ALLOC_TIME
#define blk_queue_rq_alloc_time(q)	\
	test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
#else
#define blk_queue_rq_alloc_time(q)	false
#endif

#define blk_noretry_request(rq) \
	((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
			     REQ_FAILFAST_DRIVER))
#define blk_queue_quiesced(q)	test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
#define blk_queue_pm_only(q)	atomic_read(&(q)->pm_only)
#define blk_queue_fua(q)	test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
#define blk_queue_registered(q)	test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
#define blk_queue_nowait(q)	test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)

extern void blk_set_pm_only(struct request_queue *q);
extern void blk_clear_pm_only(struct request_queue *q);

#define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)

#define rq_data_dir(rq)		(op_is_write(req_op(rq)) ? WRITE : READ)

#define rq_dma_dir(rq) \
	(op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)

#define dma_map_bvec(dev, bv, dir, attrs) \
	dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
	(dir), (attrs))

#define queue_to_disk(q)	(dev_to_disk(kobj_to_dev((q)->kobj.parent)))

static inline bool queue_is_mq(struct request_queue *q)
{
	return q->mq_ops;
}

static inline unsigned int blk_queue_cluster(struct request_queue *q)
{
	return q->limits.cluster;
}

static inline enum blk_zoned_model
blk_queue_zoned_model(struct request_queue *q)
{
	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
		return q->limits.zoned;
	return BLK_ZONED_NONE;
}

static inline bool blk_queue_is_zoned(struct request_queue *q)
{
	switch (blk_queue_zoned_model(q)) {
	case BLK_ZONED_HA:
	case BLK_ZONED_HM:
		return true;
	default:
		return false;
	}
}

static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
{
	return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
}

#ifdef CONFIG_BLK_DEV_ZONED
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
	return blk_queue_is_zoned(q) ? q->nr_zones : 0;
}

static inline unsigned int blk_queue_zone_no(struct request_queue *q,
					     sector_t sector)
{
	if (!blk_queue_is_zoned(q))
		return 0;
	return sector >> ilog2(q->limits.chunk_sectors);
}

static inline bool blk_queue_zone_is_seq(struct request_queue *q,
					 sector_t sector)
{
	if (!blk_queue_is_zoned(q))
		return false;
	if (!q->conv_zones_bitmap)
		return true;
	return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
}
#else /* CONFIG_BLK_DEV_ZONED */
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
	return 0;
}
static inline bool blk_queue_zone_is_seq(struct request_queue *q,
					 sector_t sector)
{
	return false;
}
static inline unsigned int blk_queue_zone_no(struct request_queue *q,
					     sector_t sector)
{
	return 0;
}
#endif /* CONFIG_BLK_DEV_ZONED */

static inline bool rq_is_sync(struct request *rq)
{
	return op_is_sync(rq->cmd_flags);
}

static inline bool rq_mergeable(struct request *rq)
{
	if (blk_rq_is_passthrough(rq))
		return false;

if (req_op(rq) == REQ_OP_FLUSH)
		return false;

if (req_op(rq) == REQ_OP_WRITE_ZEROES)
		return false;

if (req_op(rq) == REQ_OP_ZONE_APPEND)
		return false;

if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
		return false;
	if (rq->rq_flags & RQF_NOMERGE_FLAGS)
		return false;

return true;
}

static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
{
	if (bio_page(a) == bio_page(b) &&
	    bio_offset(a) == bio_offset(b))
		return true;

return false;
}

static inline unsigned int blk_queue_depth(struct request_queue *q)
{
	if (q->queue_depth)
		return q->queue_depth;

return q->nr_requests;
}

extern unsigned long blk_max_low_pfn, blk_max_pfn;

/*
 * standard bounce addresses:
 *
 * BLK_BOUNCE_HIGH	: bounce all highmem pages
 * BLK_BOUNCE_ANY	: don't bounce anything
 * BLK_BOUNCE_ISA	: bounce pages above ISA DMA boundary
 */

#if BITS_PER_LONG == 32
#define BLK_BOUNCE_HIGH		((u64)blk_max_low_pfn << PAGE_SHIFT)
#else
#define BLK_BOUNCE_HIGH		-1ULL
#endif
#define BLK_BOUNCE_ANY		(-1ULL)
#define BLK_BOUNCE_ISA		(DMA_BIT_MASK(24))

/*
 * default timeout for SG_IO if none specified
 */
#define BLK_DEFAULT_SG_TIMEOUT	(60 * HZ)
#define BLK_MIN_SG_TIMEOUT	(7 * HZ)

struct rq_map_data {
	struct page **pages;
	int page_order;
	int nr_entries;
	unsigned long offset;
	int null_mapped;
	int from_user;
};

struct req_iterator {
	struct bvec_iter iter;
	struct bio *bio;
};

/* This should not be used directly - use rq_for_each_segment */
#define for_each_bio(_bio)		\
	for (; _bio; _bio = _bio->bi_next)
#define __rq_for_each_bio(_bio, rq)	\
	if ((rq->bio))			\
		for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)

#define rq_for_each_segment(bvl, _rq, _iter)			\
	__rq_for_each_bio(_iter.bio, _rq)			\
		bio_for_each_segment(bvl, _iter.bio, _iter.iter)

#define rq_iter_last(bvec, _iter)				\
		(_iter.bio->bi_next == NULL &&			\
		 bio_iter_last(bvec, _iter.iter))

#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
# error	"You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
#endif
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
extern void rq_flush_dcache_pages(struct request *rq);
#else
static inline void rq_flush_dcache_pages(struct request *rq)
{
}
#endif

extern int blk_register_queue(struct gendisk *disk);
extern void blk_unregister_queue(struct gendisk *disk);
extern blk_qc_t generic_make_request(struct bio *bio);
extern blk_qc_t direct_make_request(struct bio *bio);
extern void blk_rq_init(struct request_queue *q, struct request *rq);
extern void blk_put_request(struct request *);
extern struct request *blk_get_request(struct request_queue *, unsigned int op,
				       blk_mq_req_flags_t flags);
extern int blk_lld_busy(struct request_queue *q);
extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
			     struct bio_set *bs, gfp_t gfp_mask,
			     int (*bio_ctr)(struct bio *, struct bio *, void *),
			     void *data);
extern void blk_rq_unprep_clone(struct request *rq);
extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
				     struct request *rq);
extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
extern void blk_queue_split(struct request_queue *, struct bio **);
extern void blk_recount_segments(struct request_queue *, struct bio *);
extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
			      unsigned int, void __user *);
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
			  unsigned int, void __user *);
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
			 struct scsi_ioctl_command __user *);

extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
extern void blk_queue_exit(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q);
extern int blk_rq_map_user(struct request_queue *, struct request *,
			   struct rq_map_data *, void __user *, unsigned long,
			   gfp_t);
extern int blk_rq_unmap_user(struct bio *);
extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
			       struct rq_map_data *, const struct iov_iter *,
			       gfp_t);
extern void blk_execute_rq(struct request_queue *, struct gendisk *,
			  struct request *, int);
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
				  struct request *, int, rq_end_io_fn *);
blk_status_t blk_execute_rq_rh(struct request_queue *, struct gendisk *,
			  struct request *, int);

/* Helper to convert REQ_OP_XXX to its string format XXX */
extern const char *blk_op_str(unsigned int op);

int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno);

int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);

static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{
	return bdev->bd_disk->queue;	/* this is never NULL */
}

/*
 * The basic unit of block I/O is a sector. It is used in a number of contexts
 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
 * bytes. Variables of type sector_t represent an offset or size that is a
 * multiple of 512 bytes. Hence these two constants.
 */
#ifndef SECTOR_SHIFT
#define SECTOR_SHIFT 9
#endif
#ifndef SECTOR_SIZE
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
#endif

/*
 * blk_rq_pos()			: the current sector
 * blk_rq_bytes()		: bytes left in the entire request
 * blk_rq_cur_bytes()		: bytes left in the current segment
 * blk_rq_err_bytes()		: bytes left till the next error boundary
 * blk_rq_sectors()		: sectors left in the entire request
 * blk_rq_cur_sectors()		: sectors left in the current segment
 * blk_rq_stats_sectors()	: sectors of the entire request used for stats
 */
static inline sector_t blk_rq_pos(const struct request *rq)
{
	return rq->__sector;
}

static inline unsigned int blk_rq_bytes(const struct request *rq)
{
	return rq->__data_len;
}

static inline int blk_rq_cur_bytes(const struct request *rq)
{
	return rq->bio ? bio_cur_bytes(rq->bio) : 0;
}

extern unsigned int blk_rq_err_bytes(const struct request *rq);

static inline unsigned int blk_rq_sectors(const struct request *rq)
{
	return blk_rq_bytes(rq) >> SECTOR_SHIFT;
}

static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
{
	return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
}

static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
{
	return blk_rq_aux(rq)->stats_sectors;
}

#ifdef CONFIG_BLK_DEV_ZONED

/* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);

static inline unsigned int blk_rq_zone_no(struct request *rq)
{
	return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
}

static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
{
	return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
}
#endif /* CONFIG_BLK_DEV_ZONED */

/*
 * Some commands like WRITE SAME have a payload or data transfer size which
 * is different from the size of the request.  Any driver that supports such
 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
 * calculate the data transfer size.
 */
static inline unsigned int blk_rq_payload_bytes(struct request *rq)
{
	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
		return rq->special_vec.bv_len;
	return blk_rq_bytes(rq);
}

static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
						     int op)
{
	if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
		return min(q->limits.max_discard_sectors,
			   UINT_MAX >> SECTOR_SHIFT);

if (unlikely(op == REQ_OP_WRITE_SAME))
		return q->limits.max_write_same_sectors;

if (unlikely(op == REQ_OP_WRITE_ZEROES))
		return q->limits.max_write_zeroes_sectors;

return q->limits.max_sectors;
}

/*
 * Return maximum size of a request at given offset. Only valid for
 * file system requests.
 */
static inline unsigned int blk_max_size_offset(struct request_queue *q,
					       sector_t offset,
					       unsigned int chunk_sectors)
{
	if (!chunk_sectors) {
		if (q->limits.chunk_sectors)
			chunk_sectors = q->limits.chunk_sectors;
		else
			return q->limits.max_sectors;
	}

if (likely(is_power_of_2(chunk_sectors)))
		chunk_sectors -= offset & (chunk_sectors - 1);
	else
		chunk_sectors -= sector_div(offset, chunk_sectors);

return min(q->limits.max_sectors, chunk_sectors);
}

static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
						  sector_t offset)
{
	struct request_queue *q = rq->q;

if (blk_rq_is_passthrough(rq))
		return q->limits.max_hw_sectors;

if (!q->limits.chunk_sectors ||
	    req_op(rq) == REQ_OP_DISCARD ||
	    req_op(rq) == REQ_OP_SECURE_ERASE)
		return blk_queue_get_max_sectors(q, req_op(rq));

return min(blk_max_size_offset(q, offset, 0),
			blk_queue_get_max_sectors(q, req_op(rq)));
}

static inline unsigned int blk_rq_count_bios(struct request *rq)
{
	unsigned int nr_bios = 0;
	struct bio *bio;

__rq_for_each_bio(bio, rq)
		nr_bios++;

return nr_bios;
}

void blk_steal_bios(struct bio_list *list, struct request *rq);

/*
 * Request completion related functions.
 *
 * blk_update_request() completes given number of bytes and updates
 * the request without completing it.
 */
extern bool blk_update_request(struct request *rq, blk_status_t error,
			       unsigned int nr_bytes);

extern void blk_abort_request(struct request *);

/*
 * Access functions for manipulating queue properties
 */
extern void blk_cleanup_queue(struct request_queue *);
extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
extern void blk_queue_bounce_limit(struct request_queue *, u64);
extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
extern void blk_queue_max_segments(struct request_queue *, unsigned short);
extern void blk_queue_max_discard_segments(struct request_queue *,
		unsigned short);
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
extern void blk_queue_max_discard_sectors(struct request_queue *q,
		unsigned int max_discard_sectors);
extern void blk_queue_max_write_same_sectors(struct request_queue *q,
		unsigned int max_write_same_sectors);
extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
		unsigned int max_write_same_sectors);
extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
		unsigned int max_zone_append_sectors);
extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
extern void blk_queue_alignment_offset(struct request_queue *q,
				       unsigned int alignment);
void blk_queue_update_readahead(struct request_queue *q);
extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
extern void blk_set_default_limits(struct queue_limits *lim);
extern void blk_set_stacking_limits(struct queue_limits *lim);
extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
			    sector_t offset);
extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
			    sector_t offset);
extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
			      sector_t offset);
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
extern int blk_queue_dma_drain(struct request_queue *q,
			       dma_drain_needed_fn *dma_drain_needed,
			       void *buf, unsigned int size);
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
extern void blk_queue_required_elevator_features(struct request_queue *q,
						 unsigned int features);

/*
 * Number of physical segments as sent to the device.
 *
 * Normally this is the number of discontiguous data segments sent by the
 * submitter.  But for data-less command like discard we might have no
 * actual data segments submitted, but the driver might have to add it's
 * own special payload.  In that case we still return 1 here so that this
 * special payload will be mapped.
 */
static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
{
	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
		return 1;
	return rq->nr_phys_segments;
}

/*
 * Number of discard segments (or ranges) the driver needs to fill in.
 * Each discard bio merged into a request is counted as one segment.
 */
static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
{
	return max_t(unsigned short, rq->nr_phys_segments, 1);
}

int __blk_rq_map_sg(struct request_queue *q, struct request *rq,
		struct scatterlist *sglist, struct scatterlist **last_sg);
static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
		struct scatterlist *sglist)
{
	struct scatterlist *last_sg = NULL;

return __blk_rq_map_sg(q, rq, sglist, &last_sg);
}
extern void blk_dump_rq_flags(struct request *, char *);
extern long nr_blockdev_pages(void);

bool __must_check blk_get_queue(struct request_queue *);
struct request_queue *blk_alloc_queue(gfp_t);
struct request_queue *blk_alloc_queue_rh(make_request_fn make_request, int node_id);
extern void blk_put_queue(struct request_queue *);
extern void blk_set_queue_dying(struct request_queue *);

/*
 * blk_plug permits building a queue of related requests by holding the I/O
 * fragments for a short period. This allows merging of sequential requests
 * into single larger request. As the requests are moved from a per-task list to
 * the device's request_queue in a batch, this results in improved scalability
 * as the lock contention for request_queue lock is reduced.
 *
 * It is ok not to disable preemption when adding the request to the plug list
 * or when attempting a merge, because blk_schedule_flush_list() will only flush
 * the plug list when the task sleeps by itself. For details, please see
 * schedule() where blk_schedule_flush_plug() is called.
 */
struct blk_plug {
	struct list_head mq_list; /* blk-mq requests */
	struct list_head cb_list; /* md requires an unplug callback */
	unsigned short rq_count;
	bool multiple_queues;
};
#define BLK_MAX_REQUEST_COUNT 16
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)

struct blk_plug_cb;
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
struct blk_plug_cb {
	struct list_head list;
	blk_plug_cb_fn callback;
	void *data;
};
extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
					     void *data, int size);
extern void blk_start_plug(struct blk_plug *);
extern void blk_finish_plug(struct blk_plug *);
extern void blk_flush_plug_list(struct blk_plug *, bool);

static inline void blk_flush_plug(struct task_struct *tsk)
{
	struct blk_plug *plug = tsk->plug;

if (plug)
		blk_flush_plug_list(plug, false);
}

static inline void blk_schedule_flush_plug(struct task_struct *tsk)
{
	struct blk_plug *plug = tsk->plug;

if (plug)
		blk_flush_plug_list(plug, true);
}

static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
	struct blk_plug *plug = tsk->plug;

return plug &&
		 (!list_empty(&plug->mq_list) ||
		 !list_empty(&plug->cb_list));
}

extern void blk_io_schedule(void);

int blkdev_issue_flush(struct block_device *bdev);
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, struct page *page);

#define BLKDEV_DISCARD_SECURE	(1 << 0)	/* issue a secure erase */

extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, int flags,
		struct bio **biop);

#define BLKDEV_ZERO_NOUNMAP	(1 << 0)  /* do not free blocks */
#define BLKDEV_ZERO_NOFALLBACK	(1 << 1)  /* don't write explicit zeroes */

extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
		unsigned flags);
extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, unsigned flags);

static inline int sb_issue_discard(struct super_block *sb, sector_t block,
		sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
{
	return blkdev_issue_discard(sb->s_bdev,
				    block << (sb->s_blocksize_bits -
					      SECTOR_SHIFT),
				    nr_blocks << (sb->s_blocksize_bits -
						  SECTOR_SHIFT),
				    gfp_mask, flags);
}
static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
		sector_t nr_blocks, gfp_t gfp_mask)
{
	return blkdev_issue_zeroout(sb->s_bdev,
				    block << (sb->s_blocksize_bits -
					      SECTOR_SHIFT),
				    nr_blocks << (sb->s_blocksize_bits -
						  SECTOR_SHIFT),
				    gfp_mask, 0);
}

extern int blk_verify_command(struct request_queue *q, unsigned char *cmd,
			      fmode_t mode);

static inline bool bdev_is_partition(struct block_device *bdev)
{
	return bdev->bd_partno;
}

enum blk_default_limits {
	BLK_MAX_SEGMENTS	= 128,
	BLK_SAFE_MAX_SECTORS	= 255,
	BLK_DEF_MAX_SECTORS	= 2560,
	BLK_MAX_SEGMENT_SIZE	= 65536,
	BLK_SEG_BOUNDARY_MASK	= 0xFFFFFFFFUL,
};

static inline unsigned long queue_segment_boundary(struct request_queue *q)
{
	return q->limits.seg_boundary_mask;
}

static inline unsigned long queue_virt_boundary(struct request_queue *q)
{
	return q->limits.virt_boundary_mask;
}

static inline unsigned int queue_max_sectors(struct request_queue *q)
{
	return q->limits.max_sectors;
}

static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
{
	return q->limits.max_hw_sectors;
}

static inline unsigned short queue_max_segments(struct request_queue *q)
{
	return q->limits.max_segments;
}

static inline unsigned short queue_max_discard_segments(struct request_queue *q)
{
	return q->limits.max_discard_segments;
}

static inline unsigned int queue_max_segment_size(struct request_queue *q)
{
	return q->limits.max_segment_size;
}

static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
{
	return q->limits.max_zone_append_sectors;
}

static inline unsigned short queue_logical_block_size(struct request_queue *q)
{
	int retval = 512;

if (q && q->limits.logical_block_size)
		retval = q->limits.logical_block_size;

return retval;
}

static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
{
	return queue_logical_block_size(bdev_get_queue(bdev));
}

static inline unsigned int queue_physical_block_size(struct request_queue *q)
{
	return q->limits.physical_block_size;
}

static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
{
	return queue_physical_block_size(bdev_get_queue(bdev));
}

static inline unsigned int queue_io_min(struct request_queue *q)
{
	return q->limits.io_min;
}

static inline int bdev_io_min(struct block_device *bdev)
{
	return queue_io_min(bdev_get_queue(bdev));
}

static inline unsigned int queue_io_opt(struct request_queue *q)
{
	return q->limits.io_opt;
}

static inline int bdev_io_opt(struct block_device *bdev)
{
	return queue_io_opt(bdev_get_queue(bdev));
}

static inline int queue_alignment_offset(struct request_queue *q)
{
	if (q->limits.misaligned)
		return -1;

return q->limits.alignment_offset;
}

static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
{
	unsigned int granularity = max(lim->physical_block_size, lim->io_min);
	unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
		<< SECTOR_SHIFT;

return (granularity + lim->alignment_offset - alignment) % granularity;
}

static inline int bdev_alignment_offset(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (q->limits.misaligned)
		return -1;

if (bdev_is_partition(bdev))
		return bdev->bd_part->alignment_offset;

return q->limits.alignment_offset;
}

static inline int queue_discard_alignment(struct request_queue *q)
{
	if (q->limits.discard_misaligned)
		return -1;

return q->limits.discard_alignment;
}

static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
{
	unsigned int alignment, granularity, offset;

if (!lim->max_discard_sectors)
		return 0;

/* Why are these in bytes, not sectors? */
	alignment = lim->discard_alignment >> SECTOR_SHIFT;
	granularity = lim->discard_granularity >> SECTOR_SHIFT;
	if (!granularity)
		return 0;

/* Offset of the partition start in 'granularity' sectors */
	offset = sector_div(sector, granularity);

/* And why do we do this modulus *again* in blkdev_issue_discard()? */
	offset = (granularity + alignment - offset) % granularity;

/* Turn it back into bytes, gaah */
	return offset << SECTOR_SHIFT;
}

/*
 * Two cases of handling DISCARD merge:
 * If max_discard_segments > 1, the driver takes every bio
 * as a range and send them to controller together. The ranges
 * needn't to be contiguous.
 * Otherwise, the bios/requests will be handled as same as
 * others which should be contiguous.
 */
static inline bool blk_discard_mergable(struct request *req)
{
	if (req_op(req) == REQ_OP_DISCARD &&
	    queue_max_discard_segments(req->q) > 1)
		return true;
	return false;
}

static inline int bdev_discard_alignment(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (bdev_is_partition(bdev))
		return bdev->bd_part->discard_alignment;

return q->limits.discard_alignment;
}

static inline unsigned int bdev_write_same(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (q)
		return q->limits.max_write_same_sectors;

return 0;
}

static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (q)
		return q->limits.max_write_zeroes_sectors;

return 0;
}

static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (q)
		return blk_queue_zoned_model(q);

return BLK_ZONED_NONE;
}

static inline bool bdev_is_zoned(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (q)
		return blk_queue_is_zoned(q);

return false;
}

static inline sector_t bdev_zone_sectors(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

if (q)
		return blk_queue_zone_sectors(q);
	return 0;
}

static inline int queue_dma_alignment(struct request_queue *q)
{
	return q ? q->dma_alignment : 511;
}

static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
				 unsigned int len)
{
	unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
	return !(addr & alignment) && !(len & alignment);
}

/* assumes size > 256 */
static inline unsigned int blksize_bits(unsigned int size)
{
	unsigned int bits = 8;
	do {
		bits++;
		size >>= 1;
	} while (size > 256);
	return bits;
}

static inline unsigned int block_size(struct block_device *bdev)
{
	return bdev->bd_block_size;
}

int kblockd_schedule_work(struct work_struct *work);
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);

#define MODULE_ALIAS_BLOCKDEV(major,minor) \
	MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
	MODULE_ALIAS("block-major-" __stringify(major) "-*")

#if defined(CONFIG_BLK_DEV_INTEGRITY)

enum blk_integrity_flags {
	BLK_INTEGRITY_VERIFY		= 1 << 0,
	BLK_INTEGRITY_GENERATE		= 1 << 1,
	BLK_INTEGRITY_DEVICE_CAPABLE	= 1 << 2,
	BLK_INTEGRITY_IP_CHECKSUM	= 1 << 3,
};

struct blk_integrity_iter {
	void			*prot_buf;
	void			*data_buf;
	sector_t		seed;
	unsigned int		data_size;
	unsigned short		interval;
	const char		*disk_name;
};

typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
typedef void (integrity_prepare_fn) (struct request *);
typedef void (integrity_complete_fn) (struct request *, unsigned int);

struct blk_integrity_profile_ext_ops {
	integrity_prepare_fn		*prepare_fn;
	integrity_complete_fn		*complete_fn;

RH_KABI_RESERVE(1)
	RH_KABI_RESERVE(2)
	RH_KABI_RESERVE(3)
	RH_KABI_RESERVE(4)
};

struct blk_integrity_profile {
	integrity_processing_fn		*generate_fn;
	integrity_processing_fn		*verify_fn;
	const char			*name;

RH_KABI_USE(1, const struct blk_integrity_profile_ext_ops *ext_ops)
	RH_KABI_RESERVE(2)
};

extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
extern void blk_integrity_unregister(struct gendisk *);
extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
				   struct scatterlist *);
extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);

static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{
	struct blk_integrity *bi = &disk->queue->integrity;

if (!bi->profile)
		return NULL;

return bi;
}

static inline
struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
{
	return blk_get_integrity(bdev->bd_disk);
}

static inline bool blk_integrity_rq(struct request *rq)
{
	return rq->cmd_flags & REQ_INTEGRITY;
}

static inline void blk_queue_max_integrity_segments(struct request_queue *q,
						    unsigned int segs)
{
	q->limits.max_integrity_segments = segs;
}

static inline unsigned short
queue_max_integrity_segments(struct request_queue *q)
{
	return q->limits.max_integrity_segments;
}

/**
 * bio_integrity_intervals - Return number of integrity intervals for a bio
 * @bi:		blk_integrity profile for device
 * @sectors:	Size of the bio in 512-byte sectors
 *
 * Description: The block layer calculates everything in 512 byte
 * sectors but integrity metadata is done in terms of the data integrity
 * interval size of the storage device.  Convert the block layer sectors
 * to the appropriate number of integrity intervals.
 */
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
						   unsigned int sectors)
{
	return sectors >> (bi->interval_exp - 9);
}

static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
					       unsigned int sectors)
{
	return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
}

/*
 * Return the first bvec that contains integrity data.  Only drivers that are
 * limited to a single integrity segment should use this helper.
 */
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
{
	if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
		return NULL;
	return rq->bio->bi_integrity->bip_vec;
}

#else /* CONFIG_BLK_DEV_INTEGRITY */

struct bio;
struct block_device;
struct gendisk;
struct blk_integrity;

static inline int blk_integrity_rq(struct request *rq)
{
	return 0;
}
static inline int blk_rq_count_integrity_sg(struct request_queue *q,
					    struct bio *b)
{
	return 0;
}
static inline int blk_rq_map_integrity_sg(struct request_queue *q,
					  struct bio *b,
					  struct scatterlist *s)
{
	return 0;
}
static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
{
	return NULL;
}
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{
	return NULL;
}
static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
{
	return 0;
}
static inline void blk_integrity_register(struct gendisk *d,
					 struct blk_integrity *b)
{
}
static inline void blk_integrity_unregister(struct gendisk *d)
{
}
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
						    unsigned int segs)
{
}
static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
{
	return 0;
}

static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
						   unsigned int sectors)
{
	return 0;
}

static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
					       unsigned int sectors)
{
	return 0;
}

static inline struct bio_vec *rq_integrity_vec(struct request *rq)
{
	return NULL;
}

#endif /* CONFIG_BLK_DEV_INTEGRITY */

struct block_device_operations {
	int (*open) (struct block_device *, fmode_t);
	void (*release) (struct gendisk *, fmode_t);
	int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
	int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
	int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
	unsigned int (*check_events) (struct gendisk *disk,
				      unsigned int clearing);
	/* ->media_changed() is DEPRECATED, use ->check_events() instead */
	int (*media_changed) (struct gendisk *);
	void (*unlock_native_capacity) (struct gendisk *);
	int (*revalidate_disk) (struct gendisk *);
	int (*getgeo)(struct block_device *, struct hd_geometry *);
	/* this callback is with swap_lock and sometimes page table lock held */
	void (*swap_slot_free_notify) (struct block_device *, unsigned long);

RH_KABI_REPLACE(
	int (*report_zones)(struct gendisk *, sector_t sector,
			    struct blk_zone *zones, unsigned int *nr_zones,
			    gfp_t gfp_mask),
	int (*report_zones)(struct gendisk *, sector_t sector,
			unsigned int nr_zones, report_zones_cb cb, void *data)
	)
	struct module *owner;
	const struct pr_ops *pr_ops;

RH_KABI_USE(1, char *(*devnode)(struct gendisk *disk, umode_t *mode))
	RH_KABI_USE(2, int (*set_read_only)(struct block_device *bdev, bool ro))

RH_KABI_RESERVE(3)
	RH_KABI_RESERVE(4)
};

extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
				 unsigned long);
extern int bdev_read_page(struct block_device *, sector_t, struct page *);
extern int bdev_write_page(struct block_device *, sector_t, struct page *,
						struct writeback_control *);

#ifdef CONFIG_BLK_DEV_ZONED
bool blk_req_needs_zone_write_lock(struct request *rq);
bool blk_req_zone_write_trylock(struct request *rq);
void __blk_req_zone_write_lock(struct request *rq);
void __blk_req_zone_write_unlock(struct request *rq);

static inline void blk_req_zone_write_lock(struct request *rq)
{
	if (blk_req_needs_zone_write_lock(rq))
		__blk_req_zone_write_lock(rq);
}

static inline void blk_req_zone_write_unlock(struct request *rq)
{
	if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
		__blk_req_zone_write_unlock(rq);
}

static inline bool blk_req_zone_is_write_locked(struct request *rq)
{
	return rq->q->seq_zones_wlock &&
		test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
}

static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
{
	if (!blk_req_needs_zone_write_lock(rq))
		return true;
	return !blk_req_zone_is_write_locked(rq);
}
#else
static inline bool blk_req_needs_zone_write_lock(struct request *rq)
{
	return false;
}

static inline void blk_req_zone_write_lock(struct request *rq)
{
}

static inline void blk_req_zone_write_unlock(struct request *rq)
{
}
static inline bool blk_req_zone_is_write_locked(struct request *rq)
{
	return false;
}

static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
{
	return true;
}
#endif /* CONFIG_BLK_DEV_ZONED */

#else /* CONFIG_BLOCK */

struct block_device;

/*
 * stubs for when the block layer is configured out
 */
#define buffer_heads_over_limit 0

static inline long nr_blockdev_pages(void)
{
	return 0;
}

struct blk_plug {
};

static inline void blk_start_plug(struct blk_plug *plug)
{
}

static inline void blk_finish_plug(struct blk_plug *plug)
{
}

static inline void blk_flush_plug(struct task_struct *task)
{
}

static inline void blk_schedule_flush_plug(struct task_struct *task)
{
}

static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
	return false;
}

static inline int blkdev_issue_flush(struct block_device *bdev)
{
	return 0;
}

#endif /* CONFIG_BLOCK */

static inline void blk_wake_io_task(struct task_struct *waiter)
{
	/*
	 * If we're polling, the task itself is doing the completions. For
	 * that case, we don't need to signal a wakeup, it's enough to just
	 * mark us as RUNNING.
	 */
	if (waiter == current)
		__set_current_state(TASK_RUNNING);
	else
		wake_up_process(waiter);
}

#ifdef CONFIG_BLOCK
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
		unsigned int op);
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
		unsigned long start_time);

unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part,
				 struct bio *bio);
void part_end_io_acct(struct hd_struct *part, struct bio *bio,
		      unsigned long start_time);

void bio_start_io_acct_time(struct bio *bio, unsigned int sectors,
			    unsigned long start_time);
unsigned long bio_start_io_acct(struct bio *bio);

/**
 * bio_end_io_acct - end I/O accounting for bio based drivers
 * @bio:	bio to end account for
 * @start:	start time returned by bio_start_io_acct()
 */
static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
{
	return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time);
}
#endif /* CONFIG_BLOCK */

int bdev_read_only(struct block_device *bdev);
int set_blocksize(struct block_device *bdev, int size);

const char *bdevname(struct block_device *bdev, char *buffer);
struct block_device *lookup_bdev(const char *);

void blkdev_show(struct seq_file *seqf, off_t offset);

#define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_MAX	512
#else
#define BLKDEV_MAJOR_MAX	0
#endif

int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
		void *holder);
struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole,
		void *holder);
void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
		void *holder);
void blkdev_put(struct block_device *bdev, fmode_t mode);

struct block_device *bdget(dev_t);
struct block_device *bdgrab(struct block_device *bdev);
void bdput(struct block_device *);
int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
		loff_t lend);

#ifdef CONFIG_BLOCK
void invalidate_bdev(struct block_device *bdev);
int sync_blockdev(struct block_device *bdev);
#else
static inline void invalidate_bdev(struct block_device *bdev)
{
}
static inline int sync_blockdev(struct block_device *bdev)
{
	return 0;
}
#endif
int fsync_bdev(struct block_device *bdev);

struct super_block *freeze_bdev(struct block_device *bdev);
int thaw_bdev(struct block_device *bdev, struct super_block *sb);

#endif /* _LINUX_BLKDEV_H */

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