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/jbd2.h (47971B)

/*
 * linux/include/linux/jbd2.h
 *
 * Written by Stephen C. Tweedie <sct@redhat.com>
 *
 * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
 *
 * This file is part of the Linux kernel and is made available under
 * the terms of the GNU General Public License, version 2, or at your
 * option, any later version, incorporated herein by reference.
 *
 * Definitions for transaction data structures for the buffer cache
 * filesystem journaling support.
 */

#ifndef _LINUX_JBD2_H
#define _LINUX_JBD2_H

/* Allow this file to be included directly into e2fsprogs */
#ifndef __KERNEL__
#include "jfs_compat.h"
#define JBD2_DEBUG
#else

#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/journal-head.h>
#include <linux/stddef.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/bit_spinlock.h>
#include <linux/blkdev.h>
#include <crypto/hash.h>
#endif

#define journal_oom_retry 1

/*
 * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds
 * certain classes of error which can occur due to failed IOs.  Under
 * normal use we want ext4 to continue after such errors, because
 * hardware _can_ fail, but for debugging purposes when running tests on
 * known-good hardware we may want to trap these errors.
 */
#undef JBD2_PARANOID_IOFAIL

/*
 * The default maximum commit age, in seconds.
 */
#define JBD2_DEFAULT_MAX_COMMIT_AGE 5

#ifdef CONFIG_JBD2_DEBUG
/*
 * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal
 * consistency checks.  By default we don't do this unless
 * CONFIG_JBD2_DEBUG is on.
 */
#define JBD2_EXPENSIVE_CHECKING
extern ushort jbd2_journal_enable_debug;
void __jbd2_debug(int level, const char *file, const char *func,
		  unsigned int line, const char *fmt, ...);

#define jbd_debug(n, fmt, a...) \
	__jbd2_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a)
#else
#define jbd_debug(n, fmt, a...)    /**/
#endif

extern void *jbd2_alloc(size_t size, gfp_t flags);
extern void jbd2_free(void *ptr, size_t size);

#define JBD2_MIN_JOURNAL_BLOCKS 1024

#ifdef __KERNEL__

/**
 * typedef handle_t - The handle_t type represents a single atomic update being performed by some process.
 *
 * All filesystem modifications made by the process go
 * through this handle.  Recursive operations (such as quota operations)
 * are gathered into a single update.
 *
 * The buffer credits field is used to account for journaled buffers
 * being modified by the running process.  To ensure that there is
 * enough log space for all outstanding operations, we need to limit the
 * number of outstanding buffers possible at any time.  When the
 * operation completes, any buffer credits not used are credited back to
 * the transaction, so that at all times we know how many buffers the
 * outstanding updates on a transaction might possibly touch.
 *
 * This is an opaque datatype.
 **/
typedef struct jbd2_journal_handle handle_t;	/* Atomic operation type */

/**
 * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem.
 *
 * journal_t is linked to from the fs superblock structure.
 *
 * We use the journal_t to keep track of all outstanding transaction
 * activity on the filesystem, and to manage the state of the log
 * writing process.
 *
 * This is an opaque datatype.
 **/
typedef struct journal_s	journal_t;	/* Journal control structure */
#endif

/*
 * Internal structures used by the logging mechanism:
 */

#define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */

/*
 * On-disk structures
 */

/*
 * Descriptor block types:
 */

#define JBD2_DESCRIPTOR_BLOCK	1
#define JBD2_COMMIT_BLOCK	2
#define JBD2_SUPERBLOCK_V1	3
#define JBD2_SUPERBLOCK_V2	4
#define JBD2_REVOKE_BLOCK	5

/*
 * Standard header for all descriptor blocks:
 */
typedef struct journal_header_s
{
	__be32		h_magic;
	__be32		h_blocktype;
	__be32		h_sequence;
} journal_header_t;

/*
 * Checksum types.
 */
#define JBD2_CRC32_CHKSUM   1
#define JBD2_MD5_CHKSUM     2
#define JBD2_SHA1_CHKSUM    3
#define JBD2_CRC32C_CHKSUM  4

#define JBD2_CRC32_CHKSUM_SIZE 4

#define JBD2_CHECKSUM_BYTES (32 / sizeof(u32))
/*
 * Commit block header for storing transactional checksums:
 *
 * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum*
 * fields are used to store a checksum of the descriptor and data blocks.
 *
 * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum
 * field is used to store crc32c(uuid+commit_block).  Each journal metadata
 * block gets its own checksum, and data block checksums are stored in
 * journal_block_tag (in the descriptor).  The other h_chksum* fields are
 * not used.
 *
 * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses
 * journal_block_tag3_t to store a full 32-bit checksum.  Everything else
 * is the same as v2.
 *
 * Checksum v1, v2, and v3 are mutually exclusive features.
 */
struct commit_header {
	__be32		h_magic;
	__be32          h_blocktype;
	__be32          h_sequence;
	unsigned char   h_chksum_type;
	unsigned char   h_chksum_size;
	unsigned char 	h_padding[2];
	__be32 		h_chksum[JBD2_CHECKSUM_BYTES];
	__be64		h_commit_sec;
	__be32		h_commit_nsec;
};

/*
 * The block tag: used to describe a single buffer in the journal.
 * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this
 * raw struct shouldn't be used for pointer math or sizeof() - use
 * journal_tag_bytes(journal) instead to compute this.
 */
typedef struct journal_block_tag3_s
{
	__be32		t_blocknr;	/* The on-disk block number */
	__be32		t_flags;	/* See below */
	__be32		t_blocknr_high; /* most-significant high 32bits. */
	__be32		t_checksum;	/* crc32c(uuid+seq+block) */
} journal_block_tag3_t;

typedef struct journal_block_tag_s
{
	__be32		t_blocknr;	/* The on-disk block number */
	__be16		t_checksum;	/* truncated crc32c(uuid+seq+block) */
	__be16		t_flags;	/* See below */
	__be32		t_blocknr_high; /* most-significant high 32bits. */
} journal_block_tag_t;

/* Tail of descriptor or revoke block, for checksumming */
struct jbd2_journal_block_tail {
	__be32		t_checksum;	/* crc32c(uuid+descr_block) */
};

/*
 * The revoke descriptor: used on disk to describe a series of blocks to
 * be revoked from the log
 */
typedef struct jbd2_journal_revoke_header_s
{
	journal_header_t r_header;
	__be32		 r_count;	/* Count of bytes used in the block */
} jbd2_journal_revoke_header_t;

/* Definitions for the journal tag flags word: */
#define JBD2_FLAG_ESCAPE		1	/* on-disk block is escaped */
#define JBD2_FLAG_SAME_UUID	2	/* block has same uuid as previous */
#define JBD2_FLAG_DELETED	4	/* block deleted by this transaction */
#define JBD2_FLAG_LAST_TAG	8	/* last tag in this descriptor block */

/*
 * The journal superblock.  All fields are in big-endian byte order.
 */
typedef struct journal_superblock_s
{
/* 0x0000 */
	journal_header_t s_header;

/* 0x000C */
	/* Static information describing the journal */
	__be32	s_blocksize;		/* journal device blocksize */
	__be32	s_maxlen;		/* total blocks in journal file */
	__be32	s_first;		/* first block of log information */

/* 0x0018 */
	/* Dynamic information describing the current state of the log */
	__be32	s_sequence;		/* first commit ID expected in log */
	__be32	s_start;		/* blocknr of start of log */

/* 0x0020 */
	/* Error value, as set by jbd2_journal_abort(). */
	__be32	s_errno;

/* 0x0024 */
	/* Remaining fields are only valid in a version-2 superblock */
	__be32	s_feature_compat;	/* compatible feature set */
	__be32	s_feature_incompat;	/* incompatible feature set */
	__be32	s_feature_ro_compat;	/* readonly-compatible feature set */
/* 0x0030 */
	__u8	s_uuid[16];		/* 128-bit uuid for journal */

/* 0x0040 */
	__be32	s_nr_users;		/* Nr of filesystems sharing log */

__be32	s_dynsuper;		/* Blocknr of dynamic superblock copy*/

/* 0x0048 */
	__be32	s_max_transaction;	/* Limit of journal blocks per trans.*/
	__be32	s_max_trans_data;	/* Limit of data blocks per trans. */

/* 0x0050 */
	__u8	s_checksum_type;	/* checksum type */
	__u8	s_padding2[3];
	__u32	s_padding[42];
	__be32	s_checksum;		/* crc32c(superblock) */

/* 0x0100 */
	__u8	s_users[16*48];		/* ids of all fs'es sharing the log */
/* 0x0400 */
} journal_superblock_t;

/* Use the jbd2_{has,set,clear}_feature_* helpers; these will be removed */
#define JBD2_HAS_COMPAT_FEATURE(j,mask)					\
	((j)->j_format_version >= 2 &&					\
	 ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
#define JBD2_HAS_RO_COMPAT_FEATURE(j,mask)				\
	((j)->j_format_version >= 2 &&					\
	 ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
#define JBD2_HAS_INCOMPAT_FEATURE(j,mask)				\
	((j)->j_format_version >= 2 &&					\
	 ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))

#define JBD2_FEATURE_COMPAT_CHECKSUM		0x00000001

#define JBD2_FEATURE_INCOMPAT_REVOKE		0x00000001
#define JBD2_FEATURE_INCOMPAT_64BIT		0x00000002
#define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT	0x00000004
#define JBD2_FEATURE_INCOMPAT_CSUM_V2		0x00000008
#define JBD2_FEATURE_INCOMPAT_CSUM_V3		0x00000010

/* See "journal feature predicate functions" below */

/* Features known to this kernel version: */
#define JBD2_KNOWN_COMPAT_FEATURES	JBD2_FEATURE_COMPAT_CHECKSUM
#define JBD2_KNOWN_ROCOMPAT_FEATURES	0
#define JBD2_KNOWN_INCOMPAT_FEATURES	(JBD2_FEATURE_INCOMPAT_REVOKE | \
					JBD2_FEATURE_INCOMPAT_64BIT | \
					JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \
					JBD2_FEATURE_INCOMPAT_CSUM_V2 | \
					JBD2_FEATURE_INCOMPAT_CSUM_V3)

#ifdef __KERNEL__

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

enum jbd_state_bits {
	BH_JBD			/* Has an attached ext3 journal_head */
	  = BH_PrivateStart,
	BH_JWrite,		/* Being written to log (@@@ DEBUGGING) */
	BH_Freed,		/* Has been freed (truncated) */
	BH_Revoked,		/* Has been revoked from the log */
	BH_RevokeValid,		/* Revoked flag is valid */
	BH_JBDDirty,		/* Is dirty but journaled */
	BH_State,		/* Pins most journal_head state */
	BH_JournalHead,		/* Pins bh->b_private and jh->b_bh */
	BH_Shadow,		/* IO on shadow buffer is running */
	BH_Verified,		/* Metadata block has been verified ok */
	BH_JBDPrivateStart,	/* First bit available for private use by FS */
};

BUFFER_FNS(JBD, jbd)
BUFFER_FNS(JWrite, jwrite)
BUFFER_FNS(JBDDirty, jbddirty)
TAS_BUFFER_FNS(JBDDirty, jbddirty)
BUFFER_FNS(Revoked, revoked)
TAS_BUFFER_FNS(Revoked, revoked)
BUFFER_FNS(RevokeValid, revokevalid)
TAS_BUFFER_FNS(RevokeValid, revokevalid)
BUFFER_FNS(Freed, freed)
BUFFER_FNS(Shadow, shadow)
BUFFER_FNS(Verified, verified)

static inline struct buffer_head *jh2bh(struct journal_head *jh)
{
	return jh->b_bh;
}

static inline struct journal_head *bh2jh(struct buffer_head *bh)
{
	return bh->b_private;
}

static inline void jbd_lock_bh_state(struct buffer_head *bh)
{
	bit_spin_lock(BH_State, &bh->b_state);
}

static inline int jbd_trylock_bh_state(struct buffer_head *bh)
{
	return bit_spin_trylock(BH_State, &bh->b_state);
}

static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
{
	return bit_spin_is_locked(BH_State, &bh->b_state);
}

static inline void jbd_unlock_bh_state(struct buffer_head *bh)
{
	bit_spin_unlock(BH_State, &bh->b_state);
}

static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
{
	bit_spin_lock(BH_JournalHead, &bh->b_state);
}

static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
{
	bit_spin_unlock(BH_JournalHead, &bh->b_state);
}

#define J_ASSERT(assert)	BUG_ON(!(assert))

#define J_ASSERT_BH(bh, expr)	J_ASSERT(expr)
#define J_ASSERT_JH(jh, expr)	J_ASSERT(expr)

#if defined(JBD2_PARANOID_IOFAIL)
#define J_EXPECT(expr, why...)		J_ASSERT(expr)
#define J_EXPECT_BH(bh, expr, why...)	J_ASSERT_BH(bh, expr)
#define J_EXPECT_JH(jh, expr, why...)	J_ASSERT_JH(jh, expr)
#else
#define __journal_expect(expr, why...)					     \
	({								     \
		int val = (expr);					     \
		if (!val) {						     \
			printk(KERN_ERR					     \
			       "JBD2 unexpected failure: %s: %s;\n",	     \
			       __func__, #expr);			     \
			printk(KERN_ERR why "\n");			     \
		}							     \
		val;							     \
	})
#define J_EXPECT(expr, why...)		__journal_expect(expr, ## why)
#define J_EXPECT_BH(bh, expr, why...)	__journal_expect(expr, ## why)
#define J_EXPECT_JH(jh, expr, why...)	__journal_expect(expr, ## why)
#endif

/* Flags in jbd_inode->i_flags */
#define __JI_COMMIT_RUNNING 0
#define __JI_WRITE_DATA 1
#define __JI_WAIT_DATA 2

/*
 * Commit of the inode data in progress. We use this flag to protect us from
 * concurrent deletion of inode. We cannot use reference to inode for this
 * since we cannot afford doing last iput() on behalf of kjournald
 */
#define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
/* Write allocated dirty buffers in this inode before commit */
#define JI_WRITE_DATA (1 << __JI_WRITE_DATA)
/* Wait for outstanding data writes for this inode before commit */
#define JI_WAIT_DATA (1 << __JI_WAIT_DATA)

/**
 * struct jbd_inode - The jbd_inode type is the structure linking inodes in
 * ordered mode present in a transaction so that we can sync them during commit.
 */
struct jbd2_inode {
	/**
	 * @i_transaction:
	 *
	 * Which transaction does this inode belong to? Either the running
	 * transaction or the committing one. [j_list_lock]
	 */
	transaction_t *i_transaction;

/**
	 * @i_next_transaction:
	 *
	 * Pointer to the running transaction modifying inode's data in case
	 * there is already a committing transaction touching it. [j_list_lock]
	 */
	transaction_t *i_next_transaction;

/**
	 * @i_list: List of inodes in the i_transaction [j_list_lock]
	 */
	struct list_head i_list;

/**
	 * @i_vfs_inode:
	 *
	 * VFS inode this inode belongs to [constant for lifetime of structure]
	 */
	struct inode *i_vfs_inode;

/**
	 * @i_flags: Flags of inode [j_list_lock]
	 */
	unsigned long i_flags;

/**
	 * @i_dirty_start:
	 *
	 * Offset in bytes where the dirty range for this inode starts.
	 * [j_list_lock]
	 */
	loff_t i_dirty_start;

/**
	 * @i_dirty_end:
	 *
	 * Inclusive offset in bytes where the dirty range for this inode
	 * ends. [j_list_lock]
	 */
	loff_t i_dirty_end;
};

struct jbd2_revoke_table_s;

/**
 * struct handle_s - The handle_s type is the concrete type associated with
 *     handle_t.
 * @h_transaction: Which compound transaction is this update a part of?
 * @h_journal: Which journal handle belongs to - used iff h_reserved set.
 * @h_rsv_handle: Handle reserved for finishing the logical operation.
 * @h_total_credits: Number of remaining buffers we are allowed to add to
 *	journal. These are dirty buffers and revoke descriptor blocks.
 * @h_revoke_credits: Number of remaining revoke records available for handle
 * @h_ref: Reference count on this handle.
 * @h_err: Field for caller's use to track errors through large fs operations.
 * @h_sync: Flag for sync-on-close.
 * @h_jdata: Flag to force data journaling.
 * @h_reserved: Flag for handle for reserved credits.
 * @h_aborted: Flag indicating fatal error on handle.
 * @h_type: For handle statistics.
 * @h_line_no: For handle statistics.
 * @h_start_jiffies: Handle Start time.
 * @h_requested_credits: Holds @h_total_credits after handle is started.
 * @h_revoke_credits_requested: Holds @h_revoke_credits after handle is started.
 * @saved_alloc_context: Saved context while transaction is open.
 **/

/* Docbook can't yet cope with the bit fields, but will leave the documentation
 * in so it can be fixed later.
 */

struct jbd2_journal_handle
{
	union {
		transaction_t	*h_transaction;
		/* Which journal handle belongs to - used iff h_reserved set */
		journal_t	*h_journal;
	};

handle_t		*h_rsv_handle;
	int			h_total_credits;
	int			h_revoke_credits;
	int			h_revoke_credits_requested;
	int			h_ref;
	int			h_err;

/* Flags [no locking] */
	unsigned int	h_sync:		1;
	unsigned int	h_jdata:	1;
	unsigned int	h_reserved:	1;
	unsigned int	h_aborted:	1;
	unsigned int	h_type:		8;
	unsigned int	h_line_no:	16;

unsigned long		h_start_jiffies;
	unsigned int		h_requested_credits;

unsigned int		saved_alloc_context;
};

/*
 * Some stats for checkpoint phase
 */
struct transaction_chp_stats_s {
	unsigned long		cs_chp_time;
	__u32			cs_forced_to_close;
	__u32			cs_written;
	__u32			cs_dropped;
};

/* The transaction_t type is the guts of the journaling mechanism.  It
 * tracks a compound transaction through its various states:
 *
 * RUNNING:	accepting new updates
 * LOCKED:	Updates still running but we don't accept new ones
 * RUNDOWN:	Updates are tidying up but have finished requesting
 *		new buffers to modify (state not used for now)
 * FLUSH:       All updates complete, but we are still writing to disk
 * COMMIT:      All data on disk, writing commit record
 * FINISHED:	We still have to keep the transaction for checkpointing.
 *
 * The transaction keeps track of all of the buffers modified by a
 * running transaction, and all of the buffers committed but not yet
 * flushed to home for finished transactions.
 */

/*
 * Lock ranking:
 *
 *    j_list_lock
 *      ->jbd_lock_bh_journal_head()	(This is "innermost")
 *
 *    j_state_lock
 *    ->jbd_lock_bh_state()
 *
 *    jbd_lock_bh_state()
 *    ->j_list_lock
 *
 *    j_state_lock
 *    ->t_handle_lock
 *
 *    j_state_lock
 *    ->j_list_lock			(journal_unmap_buffer)
 *
 */

struct transaction_s
{
	/* Pointer to the journal for this transaction. [no locking] */
	journal_t		*t_journal;

/* Sequence number for this transaction [no locking] */
	tid_t			t_tid;

/*
	 * Transaction's current state
	 * [no locking - only kjournald2 alters this]
	 * [j_list_lock] guards transition of a transaction into T_FINISHED
	 * state and subsequent call of __jbd2_journal_drop_transaction()
	 * FIXME: needs barriers
	 * KLUDGE: [use j_state_lock]
	 */
	enum {
		T_RUNNING,
		T_LOCKED,
		T_SWITCH,
		T_FLUSH,
		T_COMMIT,
		T_COMMIT_DFLUSH,
		T_COMMIT_JFLUSH,
		T_COMMIT_CALLBACK,
		T_FINISHED
	}			t_state;

/*
	 * Where in the log does this transaction's commit start? [no locking]
	 */
	unsigned long		t_log_start;

/* Number of buffers on the t_buffers list [j_list_lock] */
	int			t_nr_buffers;

/*
	 * Doubly-linked circular list of all buffers reserved but not yet
	 * modified by this transaction [j_list_lock]
	 */
	struct journal_head	*t_reserved_list;

/*
	 * Doubly-linked circular list of all metadata buffers owned by this
	 * transaction [j_list_lock]
	 */
	struct journal_head	*t_buffers;

/*
	 * Doubly-linked circular list of all forget buffers (superseded
	 * buffers which we can un-checkpoint once this transaction commits)
	 * [j_list_lock]
	 */
	struct journal_head	*t_forget;

/*
	 * Doubly-linked circular list of all buffers still to be flushed before
	 * this transaction can be checkpointed. [j_list_lock]
	 */
	struct journal_head	*t_checkpoint_list;

/*
	 * Doubly-linked circular list of all buffers submitted for IO while
	 * checkpointing. [j_list_lock]
	 */
	struct journal_head	*t_checkpoint_io_list;

/*
	 * Doubly-linked circular list of metadata buffers being shadowed by log
	 * IO.  The IO buffers on the iobuf list and the shadow buffers on this
	 * list match each other one for one at all times. [j_list_lock]
	 */
	struct journal_head	*t_shadow_list;

/*
	 * List of inodes whose data we've modified in data=ordered mode.
	 * [j_list_lock]
	 */
	struct list_head	t_inode_list;

/*
	 * Protects info related to handles
	 */
	spinlock_t		t_handle_lock;

/*
	 * Longest time some handle had to wait for running transaction
	 */
	unsigned long		t_max_wait;

/*
	 * When transaction started
	 */
	unsigned long		t_start;

/*
	 * When commit was requested
	 */
	unsigned long		t_requested;

/*
	 * Checkpointing stats [j_checkpoint_sem]
	 */
	struct transaction_chp_stats_s t_chp_stats;

/*
	 * Number of outstanding updates running on this transaction
	 * [none]
	 */
	atomic_t		t_updates;

/*
	 * Number of blocks reserved for this transaction in the journal.
	 * This is including all credits reserved when starting transaction
	 * handles as well as all journal descriptor blocks needed for this
	 * transaction. [none]
	 */
	atomic_t		t_outstanding_credits;

/*
	 * Number of revoke records for this transaction added by already
	 * stopped handles. [none]
	 */
	atomic_t		t_outstanding_revokes;

/*
	 * How many handles used this transaction? [none]
	 */
	atomic_t		t_handle_count;

/*
	 * Forward and backward links for the circular list of all transactions
	 * awaiting checkpoint. [j_list_lock]
	 */
	transaction_t		*t_cpnext, *t_cpprev;

/*
	 * When will the transaction expire (become due for commit), in jiffies?
	 * [no locking]
	 */
	unsigned long		t_expires;

/*
	 * When this transaction started, in nanoseconds [no locking]
	 */
	ktime_t			t_start_time;

/*
	 * This transaction is being forced and some process is
	 * waiting for it to finish.
	 */
	unsigned int t_synchronous_commit:1;

/* Disk flush needs to be sent to fs partition [no locking] */
	int			t_need_data_flush;

/*
	 * For use by the filesystem to store fs-specific data
	 * structures associated with the transaction
	 */
	struct list_head	t_private_list;
};

struct transaction_run_stats_s {
	unsigned long		rs_wait;
	unsigned long		rs_request_delay;
	unsigned long		rs_running;
	unsigned long		rs_locked;
	unsigned long		rs_flushing;
	unsigned long		rs_logging;

__u32			rs_handle_count;
	__u32			rs_blocks;
	__u32			rs_blocks_logged;
};

struct transaction_stats_s {
	unsigned long		ts_tid;
	unsigned long		ts_requested;
	struct transaction_run_stats_s run;
};

static inline unsigned long
jbd2_time_diff(unsigned long start, unsigned long end)
{
	if (end >= start)
		return end - start;

return end + (MAX_JIFFY_OFFSET - start);
}

#define JBD2_NR_BATCH	64

/**
 * struct journal_s - The journal_s type is the concrete type associated with
 *     journal_t.
 */
struct journal_s
{
	/**
	 * @j_flags: General journaling state flags [j_state_lock]
	 */
	unsigned long		j_flags;

/**
	 * @j_errno:
	 *
	 * Is there an outstanding uncleared error on the journal (from a prior
	 * abort)? [j_state_lock]
	 */
	int			j_errno;

/**
	 * @j_abort_mutex: Lock the whole aborting procedure.
	 */
	struct mutex		j_abort_mutex;

/**
	 * @j_sb_buffer: The first part of the superblock buffer.
	 */
	struct buffer_head	*j_sb_buffer;

/**
	 * @j_superblock: The second part of the superblock buffer.
	 */
	journal_superblock_t	*j_superblock;

/**
	 * @j_format_version: Version of the superblock format.
	 */
	int			j_format_version;

/**
	 * @j_state_lock: Protect the various scalars in the journal.
	 */
	rwlock_t		j_state_lock;

/**
	 * @j_barrier_count:
	 *
	 * Number of processes waiting to create a barrier lock [j_state_lock]
	 */
	int			j_barrier_count;

/**
	 * @j_barrier: The barrier lock itself.
	 */
	struct mutex		j_barrier;

/**
	 * @j_running_transaction:
	 *
	 * Transactions: The current running transaction...
	 * [j_state_lock] [caller holding open handle]
	 */
	transaction_t		*j_running_transaction;

/**
	 * @j_committing_transaction:
	 *
	 * the transaction we are pushing to disk
	 * [j_state_lock] [caller holding open handle]
	 */
	transaction_t		*j_committing_transaction;

/**
	 * @j_checkpoint_transactions:
	 *
	 * ... and a linked circular list of all transactions waiting for
	 * checkpointing. [j_list_lock]
	 */
	transaction_t		*j_checkpoint_transactions;

/**
	 * @j_wait_transaction_locked:
	 *
	 * Wait queue for waiting for a locked transaction to start committing,
	 * or for a barrier lock to be released.
	 */
	wait_queue_head_t	j_wait_transaction_locked;

/**
	 * @j_wait_done_commit: Wait queue for waiting for commit to complete.
	 */
	wait_queue_head_t	j_wait_done_commit;

/**
	 * @j_wait_commit: Wait queue to trigger commit.
	 */
	wait_queue_head_t	j_wait_commit;

/**
	 * @j_wait_updates: Wait queue to wait for updates to complete.
	 */
	wait_queue_head_t	j_wait_updates;

/**
	 * @j_wait_reserved:
	 *
	 * Wait queue to wait for reserved buffer credits to drop.
	 */
	wait_queue_head_t	j_wait_reserved;

/**
	 * @j_checkpoint_mutex:
	 *
	 * Semaphore for locking against concurrent checkpoints.
	 */
	struct mutex		j_checkpoint_mutex;

/**
	 * @j_chkpt_bhs:
	 *
	 * List of buffer heads used by the checkpoint routine.  This
	 * was moved from jbd2_log_do_checkpoint() to reduce stack
	 * usage.  Access to this array is controlled by the
	 * @j_checkpoint_mutex.  [j_checkpoint_mutex]
	 */
	struct buffer_head	*j_chkpt_bhs[JBD2_NR_BATCH];

/**
	 * @j_head:
	 *
	 * Journal head: identifies the first unused block in the journal.
	 * [j_state_lock]
	 */
	unsigned long		j_head;

/**
	 * @j_tail:
	 *
	 * Journal tail: identifies the oldest still-used block in the journal.
	 * [j_state_lock]
	 */
	unsigned long		j_tail;

/**
	 * @j_free:
	 *
	 * Journal free: how many free blocks are there in the journal?
	 * [j_state_lock]
	 */
	unsigned long		j_free;

/**
	 * @j_first:
	 *
	 * The block number of the first usable block in the journal
	 * [j_state_lock].
	 */
	unsigned long		j_first;

/**
	 * @j_last:
	 *
	 * The block number one beyond the last usable block in the journal
	 * [j_state_lock].
	 */
	unsigned long		j_last;

/**
	 * @j_dev: Device where we store the journal.
	 */
	struct block_device	*j_dev;

/**
	 * @j_blocksize: Block size for the location where we store the journal.
	 */
	int			j_blocksize;

/**
	 * @j_blk_offset:
	 *
	 * Starting block offset into the device where we store the journal.
	 */
	unsigned long long	j_blk_offset;

/**
	 * @j_devname: Journal device name.
	 */
	char			j_devname[BDEVNAME_SIZE+24];

/**
	 * @j_fs_dev:
	 *
	 * Device which holds the client fs.  For internal journal this will be
	 * equal to j_dev.
	 */
	struct block_device	*j_fs_dev;

/**
	 * @j_maxlen: Total maximum capacity of the journal region on disk.
	 */
	unsigned int		j_maxlen;

/**
	 * @j_reserved_credits:
	 *
	 * Number of buffers reserved from the running transaction.
	 */
	atomic_t		j_reserved_credits;

/**
	 * @j_list_lock: Protects the buffer lists and internal buffer state.
	 */
	spinlock_t		j_list_lock;

/**
	 * @j_inode:
	 *
	 * Optional inode where we store the journal.  If present, all
	 * journal block numbers are mapped into this inode via bmap().
	 */
	struct inode		*j_inode;

/**
	 * @j_tail_sequence:
	 *
	 * Sequence number of the oldest transaction in the log [j_state_lock]
	 */
	tid_t			j_tail_sequence;

/**
	 * @j_transaction_sequence:
	 *
	 * Sequence number of the next transaction to grant [j_state_lock]
	 */
	tid_t			j_transaction_sequence;

/**
	 * @j_commit_sequence:
	 *
	 * Sequence number of the most recently committed transaction
	 * [j_state_lock].
	 */
	tid_t			j_commit_sequence;

/**
	 * @j_commit_request:
	 *
	 * Sequence number of the most recent transaction wanting commit
	 * [j_state_lock]
	 */
	tid_t			j_commit_request;

/**
	 * @j_uuid:
	 *
	 * Journal uuid: identifies the object (filesystem, LVM volume etc)
	 * backed by this journal.  This will eventually be replaced by an array
	 * of uuids, allowing us to index multiple devices within a single
	 * journal and to perform atomic updates across them.
	 */
	__u8			j_uuid[16];

/**
	 * @j_task: Pointer to the current commit thread for this journal.
	 */
	struct task_struct	*j_task;

/**
	 * @j_max_transaction_buffers:
	 *
	 * Maximum number of metadata buffers to allow in a single compound
	 * commit transaction.
	 */
	int			j_max_transaction_buffers;

/**
	 * @j_revoke_records_per_block:
	 *
	 * Number of revoke records that fit in one descriptor block.
	 */
	int			j_revoke_records_per_block;

/**
	 * @j_commit_interval:
	 *
	 * What is the maximum transaction lifetime before we begin a commit?
	 */
	unsigned long		j_commit_interval;

/**
	 * @j_commit_timer: The timer used to wakeup the commit thread.
	 */
	struct timer_list	j_commit_timer;

/**
	 * @j_revoke_lock: Protect the revoke table.
	 */
	spinlock_t		j_revoke_lock;

/**
	 * @j_revoke:
	 *
	 * The revoke table - maintains the list of revoked blocks in the
	 * current transaction.
	 */
	struct jbd2_revoke_table_s *j_revoke;

/**
	 * @j_revoke_table: Alternate revoke tables for j_revoke.
	 */
	struct jbd2_revoke_table_s *j_revoke_table[2];

/**
	 * @j_wbuf: Array of bhs for jbd2_journal_commit_transaction.
	 */
	struct buffer_head	**j_wbuf;

/**
	 * @j_wbufsize:
	 *
	 * Size of @j_wbuf array.
	 */
	int			j_wbufsize;

/**
	 * @j_last_sync_writer:
	 *
	 * The pid of the last person to run a synchronous operation
	 * through the journal.
	 */
	pid_t			j_last_sync_writer;

/**
	 * @j_average_commit_time:
	 *
	 * The average amount of time in nanoseconds it takes to commit a
	 * transaction to disk. [j_state_lock]
	 */
	u64			j_average_commit_time;

/**
	 * @j_min_batch_time:
	 *
	 * Minimum time that we should wait for additional filesystem operations
	 * to get batched into a synchronous handle in microseconds.
	 */
	u32			j_min_batch_time;

/**
	 * @j_max_batch_time:
	 *
	 * Maximum time that we should wait for additional filesystem operations
	 * to get batched into a synchronous handle in microseconds.
	 */
	u32			j_max_batch_time;

/**
	 * @j_commit_callback:
	 *
	 * This function is called when a transaction is closed.
	 */
	void			(*j_commit_callback)(journal_t *,
						     transaction_t *);

/*
	 * Journal statistics
	 */

/**
	 * @j_history_lock: Protect the transactions statistics history.
	 */
	spinlock_t		j_history_lock;

/**
	 * @j_proc_entry: procfs entry for the jbd statistics directory.
	 */
	struct proc_dir_entry	*j_proc_entry;

/**
	 * @j_stats: Overall statistics.
	 */
	struct transaction_stats_s j_stats;

/**
	 * @j_failed_commit: Failed journal commit ID.
	 */
	unsigned int		j_failed_commit;

/**
	 * @j_private:
	 *
	 * An opaque pointer to fs-private information.  ext3 puts its
	 * superblock pointer here.
	 */
	void *j_private;

/**
	 * @j_chksum_driver:
	 *
	 * Reference to checksum algorithm driver via cryptoapi.
	 */
	struct crypto_shash *j_chksum_driver;

/**
	 * @j_csum_seed:
	 *
	 * Precomputed journal UUID checksum for seeding other checksums.
	 */
	__u32 j_csum_seed;

#ifdef CONFIG_DEBUG_LOCK_ALLOC
	/**
	 * @j_trans_commit_map:
	 *
	 * Lockdep entity to track transaction commit dependencies. Handles
	 * hold this "lock" for read, when we wait for commit, we acquire the
	 * "lock" for writing. This matches the properties of jbd2 journalling
	 * where the running transaction has to wait for all handles to be
	 * dropped to commit that transaction and also acquiring a handle may
	 * require transaction commit to finish.
	 */
	struct lockdep_map	j_trans_commit_map;
#endif
};

#define jbd2_might_wait_for_commit(j) \
	do { \
		rwsem_acquire(&j->j_trans_commit_map, 0, 0, _THIS_IP_); \
		rwsem_release(&j->j_trans_commit_map, _THIS_IP_); \
	} while (0)

/* journal feature predicate functions */
#define JBD2_FEATURE_COMPAT_FUNCS(name, flagname) \
static inline bool jbd2_has_feature_##name(journal_t *j) \
{ \
	return ((j)->j_format_version >= 2 && \
		((j)->j_superblock->s_feature_compat & \
		 cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname)) != 0); \
} \
static inline void jbd2_set_feature_##name(journal_t *j) \
{ \
	(j)->j_superblock->s_feature_compat |= \
		cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \
} \
static inline void jbd2_clear_feature_##name(journal_t *j) \
{ \
	(j)->j_superblock->s_feature_compat &= \
		~cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \
}

#define JBD2_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
static inline bool jbd2_has_feature_##name(journal_t *j) \
{ \
	return ((j)->j_format_version >= 2 && \
		((j)->j_superblock->s_feature_ro_compat & \
		 cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname)) != 0); \
} \
static inline void jbd2_set_feature_##name(journal_t *j) \
{ \
	(j)->j_superblock->s_feature_ro_compat |= \
		cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \
} \
static inline void jbd2_clear_feature_##name(journal_t *j) \
{ \
	(j)->j_superblock->s_feature_ro_compat &= \
		~cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \
}

#define JBD2_FEATURE_INCOMPAT_FUNCS(name, flagname) \
static inline bool jbd2_has_feature_##name(journal_t *j) \
{ \
	return ((j)->j_format_version >= 2 && \
		((j)->j_superblock->s_feature_incompat & \
		 cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname)) != 0); \
} \
static inline void jbd2_set_feature_##name(journal_t *j) \
{ \
	(j)->j_superblock->s_feature_incompat |= \
		cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \
} \
static inline void jbd2_clear_feature_##name(journal_t *j) \
{ \
	(j)->j_superblock->s_feature_incompat &= \
		~cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \
}

JBD2_FEATURE_COMPAT_FUNCS(checksum,		CHECKSUM)

JBD2_FEATURE_INCOMPAT_FUNCS(revoke,		REVOKE)
JBD2_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
JBD2_FEATURE_INCOMPAT_FUNCS(async_commit,	ASYNC_COMMIT)
JBD2_FEATURE_INCOMPAT_FUNCS(csum2,		CSUM_V2)
JBD2_FEATURE_INCOMPAT_FUNCS(csum3,		CSUM_V3)

/*
 * Journal flag definitions
 */
#define JBD2_UNMOUNT	0x001	/* Journal thread is being destroyed */
#define JBD2_ABORT	0x002	/* Journaling has been aborted for errors. */
#define JBD2_ACK_ERR	0x004	/* The errno in the sb has been acked */
#define JBD2_FLUSHED	0x008	/* The journal superblock has been flushed */
#define JBD2_LOADED	0x010	/* The journal superblock has been loaded */
#define JBD2_BARRIER	0x020	/* Use IDE barriers */
#define JBD2_ABORT_ON_SYNCDATA_ERR	0x040	/* Abort the journal on file
						 * data write error in ordered
						 * mode */

/*
 * Function declarations for the journaling transaction and buffer
 * management
 */

/* Filing buffers */
extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *);
extern void __jbd2_journal_refile_buffer(struct journal_head *);
extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *);
extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
extern void __journal_free_buffer(struct journal_head *bh);
extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
extern void __journal_clean_data_list(transaction_t *transaction);
static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh)
{
	list_add_tail(&bh->b_assoc_buffers, head);
}
static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
{
	list_del_init(&bh->b_assoc_buffers);
}

/* Log buffer allocation */
struct buffer_head *jbd2_journal_get_descriptor_buffer(transaction_t *, int);
void jbd2_descriptor_block_csum_set(journal_t *, struct buffer_head *);
int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid,
			      unsigned long *block);
int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);

/* Commit management */
extern void jbd2_journal_commit_transaction(journal_t *);

/* Checkpoint list management */
void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy);
int __jbd2_journal_remove_checkpoint(struct journal_head *);
void jbd2_journal_destroy_checkpoint(journal_t *journal);
void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);

/*
 * Triggers
 */

struct jbd2_buffer_trigger_type {
	/*
	 * Fired a the moment data to write to the journal are known to be
	 * stable - so either at the moment b_frozen_data is created or just
	 * before a buffer is written to the journal.  mapped_data is a mapped
	 * buffer that is the frozen data for commit.
	 */
	void (*t_frozen)(struct jbd2_buffer_trigger_type *type,
			 struct buffer_head *bh, void *mapped_data,
			 size_t size);

/*
	 * Fired during journal abort for dirty buffers that will not be
	 * committed.
	 */
	void (*t_abort)(struct jbd2_buffer_trigger_type *type,
			struct buffer_head *bh);
};

extern void jbd2_buffer_frozen_trigger(struct journal_head *jh,
				       void *mapped_data,
				       struct jbd2_buffer_trigger_type *triggers);
extern void jbd2_buffer_abort_trigger(struct journal_head *jh,
				      struct jbd2_buffer_trigger_type *triggers);

/* Buffer IO */
extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
					      struct journal_head *jh_in,
					      struct buffer_head **bh_out,
					      sector_t blocknr);

/* Transaction locking */
extern void		__wait_on_journal (journal_t *);

/* Transaction cache support */
extern void jbd2_journal_destroy_transaction_cache(void);
extern int __init jbd2_journal_init_transaction_cache(void);
extern void jbd2_journal_free_transaction(transaction_t *);

/*
 * Journal locking.
 *
 * We need to lock the journal during transaction state changes so that nobody
 * ever tries to take a handle on the running transaction while we are in the
 * middle of moving it to the commit phase.  j_state_lock does this.
 *
 * Note that the locking is completely interrupt unsafe.  We never touch
 * journal structures from interrupts.
 */

static inline handle_t *journal_current_handle(void)
{
	return current->journal_info;
}

/* The journaling code user interface:
 *
 * Create and destroy handles
 * Register buffer modifications against the current transaction.
 */

extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks,
				     int revoke_records, gfp_t gfp_mask,
				     unsigned int type, unsigned int line_no);
extern int	 jbd2_journal_restart(handle_t *, int nblocks);
extern int	 jbd2__journal_restart(handle_t *, int nblocks,
				       int revoke_records, gfp_t gfp_mask);
extern int	 jbd2_journal_start_reserved(handle_t *handle,
				unsigned int type, unsigned int line_no);
extern void	 jbd2_journal_free_reserved(handle_t *handle);
extern int	 jbd2_journal_extend(handle_t *handle, int nblocks,
				     int revoke_records);
extern int	 jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
extern int	 jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
extern int	 jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
void		 jbd2_journal_set_triggers(struct buffer_head *,
					   struct jbd2_buffer_trigger_type *type);
extern int	 jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
extern int	 jbd2_journal_forget (handle_t *, struct buffer_head *);
extern void	 journal_sync_buffer (struct buffer_head *);
extern int	 jbd2_journal_invalidatepage(journal_t *,
				struct page *, unsigned int, unsigned int);
extern int	 jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
extern int	 jbd2_journal_stop(handle_t *);
extern int	 jbd2_journal_flush (journal_t *);
extern void	 jbd2_journal_lock_updates (journal_t *);
extern void	 jbd2_journal_unlock_updates (journal_t *);

extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
				struct block_device *fs_dev,
				unsigned long long start, int len, int bsize);
extern journal_t * jbd2_journal_init_inode (struct inode *);
extern int	   jbd2_journal_update_format (journal_t *);
extern int	   jbd2_journal_check_used_features
		   (journal_t *, unsigned long, unsigned long, unsigned long);
extern int	   jbd2_journal_check_available_features
		   (journal_t *, unsigned long, unsigned long, unsigned long);
extern int	   jbd2_journal_set_features
		   (journal_t *, unsigned long, unsigned long, unsigned long);
extern void	   jbd2_journal_clear_features
		   (journal_t *, unsigned long, unsigned long, unsigned long);
extern int	   jbd2_journal_load       (journal_t *journal);
extern int	   jbd2_journal_destroy    (journal_t *);
extern int	   jbd2_journal_recover    (journal_t *journal);
extern int	   jbd2_journal_wipe       (journal_t *, int);
extern int	   jbd2_journal_skip_recovery	(journal_t *);
extern void	   jbd2_journal_update_sb_errno(journal_t *);
extern int	   jbd2_journal_update_sb_log_tail	(journal_t *, tid_t,
				unsigned long, int);
extern void	   jbd2_journal_abort      (journal_t *, int);
extern int	   jbd2_journal_errno      (journal_t *);
extern void	   jbd2_journal_ack_err    (journal_t *);
extern int	   jbd2_journal_clear_err  (journal_t *);
extern int	   jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
extern int	   jbd2_journal_force_commit(journal_t *);
extern int	   jbd2_journal_force_commit_nested(journal_t *);
extern int	   jbd2_journal_inode_add_write(handle_t *handle, struct jbd2_inode *inode);
extern int	   jbd2_journal_inode_add_wait(handle_t *handle, struct jbd2_inode *inode);
extern int	   jbd2_journal_inode_ranged_write(handle_t *handle,
			struct jbd2_inode *inode, loff_t start_byte,
			loff_t length);
extern int	   jbd2_journal_inode_ranged_wait(handle_t *handle,
			struct jbd2_inode *inode, loff_t start_byte,
			loff_t length);
extern int	   jbd2_journal_begin_ordered_truncate(journal_t *journal,
				struct jbd2_inode *inode, loff_t new_size);
extern void	   jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
extern void	   jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);

/*
 * journal_head management
 */
struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh);
struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);
void jbd2_journal_put_journal_head(struct journal_head *jh);

/*
 * handle management
 */
extern struct kmem_cache *jbd2_handle_cache;

static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
{
	return kmem_cache_zalloc(jbd2_handle_cache, gfp_flags);
}

static inline void jbd2_free_handle(handle_t *handle)
{
	kmem_cache_free(jbd2_handle_cache, handle);
}

/*
 * jbd2_inode management (optional, for those file systems that want to use
 * dynamically allocated jbd2_inode structures)
 */
extern struct kmem_cache *jbd2_inode_cache;

static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags)
{
	return kmem_cache_alloc(jbd2_inode_cache, gfp_flags);
}

static inline void jbd2_free_inode(struct jbd2_inode *jinode)
{
	kmem_cache_free(jbd2_inode_cache, jinode);
}

/* Primary revoke support */
#define JOURNAL_REVOKE_DEFAULT_HASH 256
extern int	   jbd2_journal_init_revoke(journal_t *, int);
extern void	   jbd2_journal_destroy_revoke_record_cache(void);
extern void	   jbd2_journal_destroy_revoke_table_cache(void);
extern int __init jbd2_journal_init_revoke_record_cache(void);
extern int __init jbd2_journal_init_revoke_table_cache(void);

extern void	   jbd2_journal_destroy_revoke(journal_t *);
extern int	   jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
extern int	   jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
extern void	   jbd2_journal_write_revoke_records(transaction_t *transaction,
						     struct list_head *log_bufs);

/* Recovery revoke support */
extern int	jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
extern int	jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t);
extern void	jbd2_journal_clear_revoke(journal_t *);
extern void	jbd2_journal_switch_revoke_table(journal_t *journal);
extern void	jbd2_clear_buffer_revoked_flags(journal_t *journal);

/*
 * The log thread user interface:
 *
 * Request space in the current transaction, and force transaction commit
 * transitions on demand.
 */

int jbd2_log_start_commit(journal_t *journal, tid_t tid);
int __jbd2_log_start_commit(journal_t *journal, tid_t tid);
int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
int jbd2_transaction_committed(journal_t *journal, tid_t tid);
int jbd2_complete_transaction(journal_t *journal, tid_t tid);
int jbd2_log_do_checkpoint(journal_t *journal);
int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid);

void __jbd2_log_wait_for_space(journal_t *journal);
extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
extern int jbd2_cleanup_journal_tail(journal_t *);

/*
 * is_journal_abort
 *
 * Simple test wrapper function to test the JBD2_ABORT state flag.  This
 * bit, when set, indicates that we have had a fatal error somewhere,
 * either inside the journaling layer or indicated to us by the client
 * (eg. ext3), and that we and should not commit any further
 * transactions.
 */

static inline int is_journal_aborted(journal_t *journal)
{
	return journal->j_flags & JBD2_ABORT;
}

static inline int is_handle_aborted(handle_t *handle)
{
	if (handle->h_aborted || !handle->h_transaction)
		return 1;
	return is_journal_aborted(handle->h_transaction->t_journal);
}

static inline void jbd2_journal_abort_handle(handle_t *handle)
{
	handle->h_aborted = 1;
}

#endif /* __KERNEL__   */

/* Comparison functions for transaction IDs: perform comparisons using
 * modulo arithmetic so that they work over sequence number wraps. */

static inline int tid_gt(tid_t x, tid_t y)
{
	int difference = (x - y);
	return (difference > 0);
}

static inline int tid_geq(tid_t x, tid_t y)
{
	int difference = (x - y);
	return (difference >= 0);
}

extern int jbd2_journal_blocks_per_page(struct inode *inode);
extern size_t journal_tag_bytes(journal_t *journal);

static inline bool jbd2_journal_has_csum_v2or3_feature(journal_t *j)
{
	return jbd2_has_feature_csum2(j) || jbd2_has_feature_csum3(j);
}

static inline int jbd2_journal_has_csum_v2or3(journal_t *journal)
{
	WARN_ON_ONCE(jbd2_journal_has_csum_v2or3_feature(journal) &&
		     journal->j_chksum_driver == NULL);

return journal->j_chksum_driver != NULL;
}

/*
 * Return number of free blocks in the log. Must be called under j_state_lock.
 */
static inline unsigned long jbd2_log_space_left(journal_t *journal)
{
	/* Allow for rounding errors */
	long free = journal->j_free - 32;

if (journal->j_committing_transaction) {
		free -= atomic_read(&journal->
                        j_committing_transaction->t_outstanding_credits);
	}
	return max_t(long, free, 0);
}

/*
 * Definitions which augment the buffer_head layer
 */

/* journaling buffer types */
#define BJ_None		0	/* Not journaled */
#define BJ_Metadata	1	/* Normal journaled metadata */
#define BJ_Forget	2	/* Buffer superseded by this transaction */
#define BJ_Shadow	3	/* Buffer contents being shadowed to the log */
#define BJ_Reserved	4	/* Buffer is reserved for access by journal */
#define BJ_Types	5

extern int jbd_blocks_per_page(struct inode *inode);

/* JBD uses a CRC32 checksum */
#define JBD_MAX_CHECKSUM_SIZE 4

static inline u32 jbd2_chksum(journal_t *journal, u32 crc,
			      const void *address, unsigned int length)
{
	struct {
		struct shash_desc shash;
		char ctx[JBD_MAX_CHECKSUM_SIZE];
	} desc;
	int err;

BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) >
		JBD_MAX_CHECKSUM_SIZE);

desc.shash.tfm = journal->j_chksum_driver;
	desc.shash.flags = 0;
	*(u32 *)desc.ctx = crc;

err = crypto_shash_update(&desc.shash, address, length);
	BUG_ON(err);

return *(u32 *)desc.ctx;
}

/* Return most recent uncommitted transaction */
static inline tid_t  jbd2_get_latest_transaction(journal_t *journal)
{
	tid_t tid;

read_lock(&journal->j_state_lock);
	tid = journal->j_commit_request;
	if (journal->j_running_transaction)
		tid = journal->j_running_transaction->t_tid;
	read_unlock(&journal->j_state_lock);
	return tid;
}

static inline int jbd2_handle_buffer_credits(handle_t *handle)
{
	journal_t *journal;

if (!handle->h_reserved)
		journal = handle->h_transaction->t_journal;
	else
		journal = handle->h_journal;

return handle->h_total_credits -
		DIV_ROUND_UP(handle->h_revoke_credits_requested,
			     journal->j_revoke_records_per_block);
}

#ifdef __KERNEL__

#define buffer_trace_init(bh)	do {} while (0)
#define print_buffer_fields(bh)	do {} while (0)
#define print_buffer_trace(bh)	do {} while (0)
#define BUFFER_TRACE(bh, info)	do {} while (0)
#define BUFFER_TRACE2(bh, bh2, info)	do {} while (0)
#define JBUFFER_TRACE(jh, info)	do {} while (0)

#endif	/* __KERNEL__ */

#define EFSBADCRC	EBADMSG		/* Bad CRC detected */
#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */

#endif	/* _LINUX_JBD2_H */

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