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amba
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drwxr-xr-x
2021-04-21 07:33
bcma
[ DIR ]
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byteorder
[ DIR ]
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can
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clk
[ DIR ]
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decompress
[ DIR ]
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dma
[ DIR ]
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fpga
[ DIR ]
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fsl
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gpio
[ DIR ]
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hsi
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i2c
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iio
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input
[ DIR ]
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irqchip
[ DIR ]
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isdn
[ DIR ]
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lockd
[ DIR ]
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mfd
[ DIR ]
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mlx4
[ DIR ]
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mlx5
[ DIR ]
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mmc
[ DIR ]
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mtd
[ DIR ]
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netfilter
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netfilter_arp
[ DIR ]
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netfilter_bridge
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netfilter_ipv4
[ DIR ]
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netfilter_ipv6
[ DIR ]
drwxr-xr-x
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perf
[ DIR ]
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phy
[ DIR ]
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pinctrl
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platform_data
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power
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qed
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raid
[ DIR ]
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regulator
[ DIR ]
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reset
[ DIR ]
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rtc
[ DIR ]
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sched
[ DIR ]
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soc
[ DIR ]
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spi
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ssb
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sunrpc
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ulpi
[ DIR ]
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unaligned
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usb
[ DIR ]
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uwb
[ DIR ]
drwxr-xr-x
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wimax
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drwxr-xr-x
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8250_pci.h
999
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2016-01-11 00:01
a.out.h
315
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acct.h
2.51
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acpi.h
28.55
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2021-04-16 11:57
acpi_dma.h
3.22
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2016-01-11 00:01
acpi_pmtmr.h
635
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2016-01-11 00:01
adb.h
1.75
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adfs_fs.h
535
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aer.h
1.66
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agp_backend.h
3.45
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agpgart.h
3.82
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ahci_platform.h
1.49
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aio.h
879
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alarmtimer.h
1.64
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altera_jtaguart.h
340
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altera_uart.h
358
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amd-iommu.h
5.93
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amifd.h
1.95
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amifdreg.h
2.61
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amigaffs.h
2.86
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anon_inodes.h
455
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apm-emulation.h
1.54
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apm_bios.h
2.68
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apple_bl.h
459
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arm-cci.h
2.01
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arm-smccc.h
9.44
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2021-04-16 11:57
asn1.h
1.99
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2016-01-11 00:01
asn1_ber_bytecode.h
2.72
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asn1_decoder.h
675
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assoc_array.h
3.07
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assoc_array_priv.h
5.49
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2016-01-11 00:01
async.h
1.65
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2016-01-11 00:01
async_tx.h
6.76
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2016-01-11 00:01
ata.h
29.47
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2021-04-16 11:57
ata_platform.h
690
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2016-01-11 00:01
atalk.h
4.32
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2021-04-16 11:57
ath9k_platform.h
1.36
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2016-01-11 00:01
atm.h
248
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2016-01-11 00:01
atm_suni.h
253
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2016-01-11 00:01
atm_tcp.h
472
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2016-01-11 00:01
atmdev.h
9.52
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2016-01-11 00:01
atmel-mci.h
1.31
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2016-01-11 00:01
atmel-ssc.h
9.68
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2016-01-11 00:01
atmel_pdc.h
1.47
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2016-01-11 00:01
atmel_serial.h
7.66
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2016-01-11 00:01
atmel_tc.h
11.33
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2016-01-11 00:01
atomic.h
14.97
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2021-04-16 11:57
attribute_container.h
2.47
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2016-01-11 00:01
audit.h
17.56
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2021-04-16 11:57
auto_dev-ioctl.h
5.06
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2016-01-11 00:01
auto_fs.h
657
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2016-01-11 00:01
auxvec.h
265
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average.h
1.48
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2016-01-11 00:01
b1pcmcia.h
666
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backing-dev-defs.h
7.81
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2021-04-16 11:57
backing-dev.h
14.39
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backlight.h
5.14
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2016-01-11 00:01
balloon_compaction.h
6.91
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2016-01-11 00:01
basic_mmio_gpio.h
2.23
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bcd.h
520
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2016-01-11 00:01
bch.h
2.6
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2016-01-11 00:01
bcm47xx_nvram.h
1.19
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bcm47xx_wdt.h
617
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bfin_mac.h
559
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binfmts.h
3.96
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2016-01-11 00:01
bio.h
21.38
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bit_spinlock.h
2.27
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2016-01-11 00:01
bitmap.h
13.04
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2021-04-16 11:57
bitops.h
5.46
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bitrev.h
2
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bits.h
833
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blk-cgroup.h
21.95
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2016-01-11 00:01
blk-iopoll.h
1.13
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2016-01-11 00:01
blk-mq.h
7.56
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2021-04-16 11:57
blk_types.h
8.43
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2016-01-11 00:01
blkdev.h
50.19
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2021-04-16 11:57
blkpg.h
397
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2016-01-11 00:01
blktrace_api.h
3.4
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2021-04-16 11:57
blockgroup_lock.h
1.14
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2016-01-11 00:01
bma150.h
1.89
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2016-01-11 00:01
bootmem.h
10.61
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bottom_half.h
764
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bpf.h
7.13
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2021-04-16 11:57
brcmphy.h
8.66
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2016-01-11 00:01
bsearch.h
236
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bsg-lib.h
1.98
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bsg.h
734
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btree-128.h
2.63
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2016-01-11 00:01
btree-type.h
3.86
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2016-01-11 00:01
btree.h
6.8
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btrfs.h
106
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buffer_head.h
12.73
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2021-04-16 11:57
bug.h
3.63
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2021-04-16 11:57
c2port.h
1.59
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2016-01-11 00:01
cache.h
2.09
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2021-04-16 11:57
cacheinfo.h
3.04
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capability.h
7.68
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cb710.h
5.69
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2016-01-11 00:01
cciss_ioctl.h
1014
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2016-01-11 00:01
ccp.h
15.37
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2016-01-11 00:01
cdev.h
787
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cdrom.h
8.66
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cfag12864b.h
2.1
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2016-01-11 00:01
cgroup-defs.h
16.01
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2021-04-16 11:57
cgroup.h
20.73
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2021-04-16 11:57
cgroup_subsys.h
1.39
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2016-01-11 00:01
circ_buf.h
1.05
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2016-01-11 00:01
cleancache.h
3.86
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2016-01-11 00:01
clk-provider.h
27.54
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2021-04-16 11:57
clk.h
13.74
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2016-01-11 00:01
clkdev.h
1.32
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2016-01-11 00:01
clksrc-dbx500-prcmu.h
455
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2016-01-11 00:01
clock_cooling.h
2.06
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2016-01-11 00:01
clockchips.h
7.3
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2016-01-11 00:01
clocksource.h
7.59
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2016-01-11 00:01
cm4000_cs.h
160
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2016-01-11 00:01
cma.h
920
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2016-01-11 00:01
cmdline-parser.h
1.17
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cn_proc.h
1.85
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2016-01-11 00:01
cnt32_to_63.h
3.6
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2016-01-11 00:01
coda.h
2.16
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2021-04-16 11:57
coda_psdev.h
2.97
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2021-04-16 11:57
compaction.h
5.74
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2021-04-16 11:57
compat.h
25.59
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compiler-clang.h
525
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compiler-gcc.h
11.09
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compiler-intel.h
1.13
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2016-01-11 00:01
compiler.h
16.7
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2021-04-16 11:57
completion.h
3.47
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2016-01-11 00:01
component.h
1.14
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2016-01-11 00:01
concap.h
3.69
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2016-01-11 00:01
configfs.h
6.88
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2016-01-11 00:01
connector.h
2.43
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2016-01-11 00:01
console.h
6.08
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console_struct.h
5.13
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2016-01-11 00:01
consolemap.h
1
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container.h
668
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2016-01-11 00:01
context_tracking.h
3.15
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2016-01-11 00:01
context_tracking_state.h
1.34
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2016-01-11 00:01
cordic.h
1.75
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2016-01-11 00:01
coredump.h
744
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coresight.h
8.7
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2016-01-11 00:01
count_zeros.h
1.62
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2016-01-11 00:01
cper.h
12.57
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2016-01-11 00:01
cpu.h
10.25
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cpu_cooling.h
3.88
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2016-01-11 00:01
cpu_pm.h
2.78
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cpu_rmap.h
1.86
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cpufeature.h
1.85
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cpufreq-dt.h
569
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cpufreq.h
19.01
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cpuidle.h
8.07
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cpumask.h
24.06
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cpuset.h
6.11
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cputime.h
334
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crash_dump.h
2.82
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crc-ccitt.h
330
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crc-itu-t.h
613
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crc-t10dif.h
376
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crc16.h
622
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crc32.h
2.83
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crc32c.h
254
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crc7.h
277
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crc8.h
3.65
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cred.h
12.26
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crypto.h
62.6
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cryptohash.h
448
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2016-01-11 00:01
cs5535.h
6.28
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ctype.h
1.69
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cuda.h
462
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2016-01-11 00:01
cyclades.h
10.26
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2016-01-11 00:01
davinci_emac.h
1.12
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2016-01-11 00:01
dax.h
1.45
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2016-01-11 00:01
dca.h
2.62
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dcache.h
18.9
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dccp.h
10.69
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dcookies.h
1.25
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2016-01-11 00:01
debug_locks.h
1.48
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debugfs.h
9.86
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debugobjects.h
3.65
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2016-01-11 00:01
delay.h
1.39
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2016-01-11 00:01
delayacct.h
4
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2016-01-11 00:01
dell-led.h
133
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2016-01-11 00:01
devcoredump.h
986
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2016-01-11 00:01
devfreq-event.h
5.64
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devfreq.h
10.5
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2016-01-11 00:01
devfreq_cooling.h
2.56
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2021-04-16 11:57
device-mapper.h
16.3
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2021-04-16 11:57
device.h
47.02
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device_cgroup.h
597
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devpts_fs.h
1.1
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digsig.h
1.35
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dim.h
8.98
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dio.h
10.93
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dirent.h
177
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dlm.h
6.01
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dlm_plock.h
678
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dm-dirty-log.h
3.94
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1.91
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2.85
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3.11
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dm9000.h
1.11
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dma-attrs.h
1.87
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dma-buf.h
8.85
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dma-contiguous.h
4.45
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dma-debug.h
5.09
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dma-direction.h
299
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dma-iommu.h
2.73
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dma-mapping.h
9.4
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dma_remapping.h
1.38
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dmaengine.h
40.34
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dmapool.h
1.09
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2016-01-11 00:01
dmar.h
7.82
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dmi.h
4.01
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dnotify.h
1008
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dns_resolver.h
1.31
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dqblk_qtree.h
2.06
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dqblk_v1.h
288
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dqblk_v2.h
367
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drbd.h
10.26
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drbd_genl.h
15.8
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drbd_genl_api.h
1.73
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drbd_limits.h
7.09
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ds1286.h
1.19
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ds17287rtc.h
2.61
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ds2782_battery.h
119
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dtlk.h
3.46
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2016-01-11 00:01
dw_apb_timer.h
1.71
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dynamic_debug.h
3.91
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dynamic_queue_limits.h
3.66
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earlycpio.h
320
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ecryptfs.h
3.79
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edac.h
24.46
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edd.h
1.43
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edma.h
807
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eeprom_93cx6.h
2.94
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eeprom_93xx46.h
422
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efi-bgrt.h
427
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efi.h
37.01
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efs_vh.h
1.51
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eisa.h
2.92
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2016-01-11 00:01
elevator.h
6.94
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elf-fdpic.h
2.18
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2016-01-11 00:01
elf-randomize.h
544
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2016-01-11 00:01
elf.h
1.44
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elfcore-compat.h
1.2
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elfcore.h
2.42
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elfnote.h
3.5
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enclosure.h
4.6
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err.h
1.48
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errno.h
1.24
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errqueue.h
450
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etherdevice.h
13.77
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ethtool.h
15.11
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eventfd.h
2.05
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eventpoll.h
2.01
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evm.h
2.48
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export.h
2.73
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exportfs.h
7.78
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ext2_fs.h
928
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extcon.h
11.03
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f2fs_fs.h
16.54
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f75375s.h
541
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falloc.h
719
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fanotify.h
206
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fault-inject.h
1.84
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fb.h
28.61
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2021-04-16 11:57
fcdevice.h
988
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fcntl.h
1.23
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fd.h
451
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fddidevice.h
1.08
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fdtable.h
3.2
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fec.h
609
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2016-01-11 00:01
fence.h
12.72
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file.h
1.79
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filter.h
16.17
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fips.h
128
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firewire.h
13.36
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firmware-map.h
1.32
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firmware.h
2.01
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fixp-arith.h
4.41
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flat.h
1.58
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flex_array.h
2.43
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flex_proportions.h
2.78
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fmc-sdb.h
1.25
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fmc.h
8.34
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font.h
1.6
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freezer.h
8.65
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frontswap.h
2.69
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fs.h
101.49
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fs_enet_pd.h
3.38
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fs_pin.h
580
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fs_stack.h
772
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fs_struct.h
999
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fs_uart_pd.h
1.49
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fscache-cache.h
18.39
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fscache.h
27.87
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fsl-diu-fb.h
4.08
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fsl_devices.h
4.28
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fsl_hypervisor.h
2.76
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fsl_ifc.h
24.76
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fsldma.h
398
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fsnotify.h
7.68
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fsnotify_backend.h
16.77
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ftrace.h
29
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ftrace_irq.h
298
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2016-01-11 00:01
futex.h
2.35
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fwnode.h
630
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gameport.h
5.56
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gcd.h
154
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genalloc.h
4.84
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genetlink.h
1.35
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genhd.h
22.75
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genl_magic_func.h
11.91
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genl_magic_struct.h
7.47
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2021-04-16 11:57
getcpu.h
602
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2016-01-11 00:01
gfp.h
21.65
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glob.h
217
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goldfish.h
566
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gpio-fan.h
802
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2016-01-11 00:01
gpio-pxa.h
532
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gpio.h
5.15
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gpio_keys.h
1.66
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gpio_mouse.h
1.46
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hardirq.h
1.7
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hash.h
2.67
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hashtable.h
6.46
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hdlc.h
3.43
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hdlcdrv.h
6.28
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hdmi.h
9.27
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hid-debug.h
2.07
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hid-roccat.h
688
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2016-01-11 00:01
hid-sensor-hub.h
8.67
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hid-sensor-ids.h
6.66
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hid.h
34.79
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hiddev.h
1.88
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hidraw.h
1.49
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highmem.h
5.8
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highuid.h
3.08
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hil.h
18.42
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hil_mlc.h
5.13
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hippidevice.h
1.29
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2016-01-11 00:01
host1x.h
7.72
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hp_sdc.h
14.02
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hpet.h
2.52
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hrtimer.h
14.1
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2021-04-16 11:57
htcpld.h
578
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htirq.h
1.04
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huge_mm.h
6.97
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hugetlb.h
15.3
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hugetlb_cgroup.h
2.97
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hugetlb_inline.h
329
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hw_breakpoint.h
3.81
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hw_random.h
2.11
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hwmon-sysfs.h
1.98
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hwmon-vid.h
1.48
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hwmon.h
1.01
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hwspinlock.h
11.06
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2016-01-11 00:01
hyperv.h
42.12
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i2c-algo-bit.h
2.24
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i2c-algo-pca.h
2.85
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2021-04-16 11:57
i2c-algo-pcf.h
1.88
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i2c-dev.h
1.03
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2016-01-11 00:01
i2c-gpio.h
1.31
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2016-01-11 00:01
i2c-mux-gpio.h
1.35
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i2c-mux-pinctrl.h
1.44
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i2c-mux.h
1.64
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2016-01-11 00:01
i2c-ocores.h
757
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i2c-omap.h
1.17
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i2c-pca-platform.h
402
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i2c-pnx.h
923
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i2c-pxa.h
399
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i2c-smbus.h
1.72
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i2c-xiic.h
1.41
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i2c.h
24.57
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i7300_idle.h
1.91
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i8042.h
2.14
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i8253.h
809
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icmp.h
863
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2016-01-11 00:01
icmpv6.h
1.11
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ide.h
45.45
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idr.h
5.49
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2016-01-11 00:01
ieee80211.h
76.64
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2021-04-16 11:57
ieee802154.h
9.65
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2016-01-11 00:01
if_arp.h
1.52
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if_bridge.h
1.98
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if_eql.h
1.07
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if_ether.h
1.35
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if_fddi.h
3.44
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2016-01-11 00:01
if_frad.h
2.88
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if_link.h
495
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2016-01-11 00:01
if_ltalk.h
149
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if_macvlan.h
2.83
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2016-01-11 00:01
if_phonet.h
274
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if_pppol2tp.h
727
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if_pppox.h
3.11
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if_team.h
7.52
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if_tun.h
1011
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if_tunnel.h
370
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if_vlan.h
17.76
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igmp.h
4.24
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ihex.h
1.92
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ima.h
1.95
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in.h
2.43
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in6.h
1.85
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inet.h
2.61
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inet_diag.h
1.44
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inet_lro.h
3.58
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inetdevice.h
7.72
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init.h
9.58
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init_ohci1394_dma.h
157
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init_task.h
7.44
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initrd.h
583
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inotify.h
657
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2016-01-11 00:01
input-polldev.h
2.17
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input.h
18.49
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integrity.h
1.02
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2016-01-11 00:01
intel-iommu.h
17.05
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intel-svm.h
4.33
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2016-01-11 00:01
intel_pmic_gpio.h
372
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2016-01-11 00:01
interrupt.h
19.76
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interval_tree.h
757
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interval_tree_generic.h
6.96
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io-64-nonatomic-hi-lo.h
610
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io-64-nonatomic-lo-hi.h
610
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io-mapping.h
3.71
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io.h
5.27
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ioc3.h
3.14
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ioc4.h
5.78
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mutex-debug.h
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node.h
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nodemask.h
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nospec.h
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notifier.h
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nsproxy.h
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nvmem-consumer.h
4.11
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nvmem-provider.h
1.06
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4.19
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4.37
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1.4
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olpc-ec.h
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9.94
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once.h
1.65
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3.17
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openvswitch.h
844
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6.1
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1
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3.08
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pagevec.h
1.7
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parport.h
17.82
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parport_pc.h
6.52
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parser.h
982
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pata_arasan_cf_data.h
1.22
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patchkey.h
718
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path.h
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999
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pci-acpi.h
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pci-aspm.h
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pci-ats.h
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415
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pci-ecam.h
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pci.h
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pci_hotplug.h
6.79
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pci_ids.h
116.76
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pcieport_if.h
2.16
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pda_power.h
1.12
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pe.h
15.48
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percpu-defs.h
18.81
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percpu-refcount.h
9.92
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percpu-rwsem.h
1.47
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percpu.h
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percpu_counter.h
4.21
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percpu_ida.h
2.28
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perf_event.h
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perf_regs.h
969
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personality.h
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385
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phonet.h
1.12
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phy.h
26.59
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phy_fixed.h
1.58
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pid.h
5.83
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pid_namespace.h
2.35
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pim.h
518
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pipe_fs_i.h
5.4
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pktcdvd.h
5.87
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pl320-ipc.h
758
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platform_device.h
12.37
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plist.h
8.69
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pm-trace.h
728
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32.04
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1.68
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2.12
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4.09
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8.28
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6.18
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2.3
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poison.h
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poll.h
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posix-clock.h
5.44
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posix-timers.h
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posix_acl.h
3.58
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posix_acl_xattr.h
2.2
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power_supply.h
12.09
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powercap.h
12.58
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ppp-comp.h
3.1
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3.07
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ppp_defs.h
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pps-gpio.h
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3.56
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pr.h
527
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prandom.h
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preempt.h
8.61
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prefetch.h
1.5
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proc_fs.h
3.19
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proc_ns.h
2.18
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profile.h
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projid.h
2.18
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property.h
7.54
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proportions.h
3.19
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psci.h
1.79
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pstore.h
2.54
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pstore_ram.h
2.7
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pti.h
1.53
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ptp_classify.h
2.89
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ptp_clock_kernel.h
6.52
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ptrace.h
15.21
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pvclock_gtod.h
509
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pwm.h
8.44
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pwm_backlight.h
701
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pxa168_eth.h
689
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pxa2xx_ssp.h
9.75
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qcom_scm.h
1.25
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qnx6_fs.h
3.23
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quicklist.h
2.1
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quota.h
18.12
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quotaops.h
10.15
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radix-tree.h
17.93
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raid_class.h
2.08
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ramfs.h
723
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random.h
1.81
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range.h
612
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ras.h
352
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ratelimit.h
1.89
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rational.h
600
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rbtree.h
4.38
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rbtree_augmented.h
7.5
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rbtree_latch.h
6.58
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rcu_sync.h
2.51
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rculist.h
19.93
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rculist_bl.h
4.32
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rculist_nulls.h
4.3
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rcupdate.h
40.18
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rcutiny.h
4.31
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rcutree.h
3.64
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reboot.h
1.91
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reciprocal_div.h
993
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regmap.h
35.16
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regset.h
13
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relay.h
8.61
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remoteproc.h
17.47
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reservation.h
4.41
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reset-controller.h
1.89
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reset.h
2.38
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resource.h
306
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resource_ext.h
2.22
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rfkill-gpio.h
1.13
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rfkill-regulator.h
1.38
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rfkill.h
9.49
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rhashtable.h
27.07
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ring_buffer.h
6.7
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rio.h
16.47
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rio_drv.h
14.01
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rio_ids.h
1.22
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rio_regs.h
14.73
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rmap.h
8.04
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rndis.h
16.83
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root_dev.h
540
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rotary_encoder.h
362
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rpmsg.h
11.41
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rslib.h
2.99
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rtc-ds2404.h
467
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rtc-v3020.h
1.03
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rtc.h
6.9
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rtmutex.h
2.82
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rtnetlink.h
3.9
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rwlock.h
4.29
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rwlock_api_smp.h
7.63
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rwlock_types.h
1.18
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rwsem-spinlock.h
1.47
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rwsem.h
5.12
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rxrpc.h
2.33
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2016-01-11 00:01
s3c_adc_battery.h
932
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sa11x0-dma.h
572
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scatterlist.h
11.58
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scc.h
2.8
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sched.h
94.27
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sched_clock.h
559
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scif.h
58.85
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scpi_protocol.h
2.36
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screen_info.h
152
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sctp.h
21.93
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scx200.h
1.78
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scx200_gpio.h
2.34
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sdb.h
4.13
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sdla.h
6.9
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seccomp.h
2.7
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securebits.h
200
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security.h
44.34
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selection.h
1.34
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selinux.h
910
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sem.h
1.3
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semaphore.h
1.36
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seq_buf.h
3.11
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seq_file.h
6.63
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seq_file_net.h
674
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seqlock.h
16.34
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seqno-fence.h
3.91
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serial.h
630
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serial_8250.h
5.35
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serial_bcm63xx.h
4.69
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serial_core.h
16.06
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serial_max3100.h
1.39
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serial_pnx8xxx.h
2.61
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serial_s3c.h
9.24
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serial_sci.h
1.78
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serio.h
4.38
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sfi.h
5.73
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sfi_acpi.h
3.39
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sh_clk.h
6.09
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sh_dma.h
3.61
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sh_eth.h
396
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sh_intc.h
3.39
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sh_timer.h
133
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shdma-base.h
4.41
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shm.h
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Save
Rename
/* * 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 <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 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; /* Tail of revoke block, for checksumming */ struct jbd2_journal_revoke_tail { __be32 r_checksum; /* crc32c(uuid+revoke_block) */ }; /* 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 /* 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) /** * struct jbd_inode is the structure linking inodes in ordered mode * present in a transaction so that we can sync them during commit. */ struct jbd2_inode { /* Which transaction does this inode belong to? Either the running * transaction or the committing one. [j_list_lock] */ transaction_t *i_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; /* List of inodes in the i_transaction [j_list_lock] */ struct list_head i_list; /* VFS inode this inode belongs to [constant during the lifetime * of the structure] */ struct inode *i_vfs_inode; /* Flags of inode [j_list_lock] */ unsigned long i_flags; }; 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_buffer_credits: Number of remaining buffers we are allowed to dirty. * @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_aborted: flag indicating fatal error on handle **/ /* 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 { /* Which compound transaction is this update a part of? */ transaction_t *h_transaction; /* Which journal handle belongs to - used iff h_reserved set */ journal_t *h_journal; }; /* Handle reserved for finishing the logical operation */ handle_t *h_rsv_handle; /* Number of remaining buffers we are allowed to dirty: */ int h_buffer_credits; /* Reference count on this handle */ int h_ref; /* Field for caller's use to track errors through large fs */ /* operations */ int h_err; /* Flags [no locking] */ unsigned int h_sync: 1; /* sync-on-close */ unsigned int h_jdata: 1; /* force data journaling */ unsigned int h_reserved: 1; /* handle with reserved credits */ unsigned int h_aborted: 1; /* fatal error on handle */ unsigned int h_type: 8; /* for handle statistics */ unsigned int h_line_no: 16; /* for handle statistics */ unsigned long h_start_jiffies; unsigned int h_requested_credits; #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map h_lockdep_map; #endif }; /* * 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_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 * [t_handle_lock] */ atomic_t t_updates; /* * Number of buffers reserved for use by all handles in this transaction * handle but not yet modified. [t_handle_lock] */ atomic_t t_outstanding_credits; /* * 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; /* * How many handles used this transaction? [t_handle_lock] */ atomic_t t_handle_count; /* * 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. * @j_flags: General journaling state flags * @j_errno: Is there an outstanding uncleared error on the journal (from a * prior abort)? * @j_sb_buffer: First part of superblock buffer * @j_superblock: Second part of superblock buffer * @j_format_version: Version of the superblock format * @j_state_lock: Protect the various scalars in the journal * @j_barrier_count: Number of processes waiting to create a barrier lock * @j_barrier: The barrier lock itself * @j_running_transaction: The current running transaction.. * @j_committing_transaction: the transaction we are pushing to disk * @j_checkpoint_transactions: a linked circular list of all transactions * waiting for checkpointing * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction * to start committing, or for a barrier lock to be released * @j_wait_done_commit: Wait queue for waiting for commit to complete * @j_wait_commit: Wait queue to trigger commit * @j_wait_updates: Wait queue to wait for updates to complete * @j_wait_reserved: Wait queue to wait for reserved buffer credits to drop * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints * @j_head: Journal head - identifies the first unused block in the journal * @j_tail: Journal tail - identifies the oldest still-used block in the * journal. * @j_free: Journal free - how many free blocks are there in the journal? * @j_first: The block number of the first usable block * @j_last: The block number one beyond the last usable block * @j_dev: Device where we store the journal * @j_blocksize: blocksize for the location where we store the journal. * @j_blk_offset: starting block offset for into the device where we store the * journal * @j_fs_dev: Device which holds the client fs. For internal journal this will * be equal to j_dev * @j_reserved_credits: Number of buffers reserved from the running transaction * @j_maxlen: Total maximum capacity of the journal region on disk. * @j_list_lock: Protects the buffer lists and internal buffer state. * @j_inode: Optional inode where we store the journal. If present, all journal * block numbers are mapped into this inode via bmap(). * @j_tail_sequence: Sequence number of the oldest transaction in the log * @j_transaction_sequence: Sequence number of the next transaction to grant * @j_commit_sequence: Sequence number of the most recently committed * transaction * @j_commit_request: Sequence number of the most recent transaction wanting * commit * @j_uuid: Uuid of client object. * @j_task: Pointer to the current commit thread for this journal * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a * single compound commit transaction * @j_commit_interval: What is the maximum transaction lifetime before we begin * a commit? * @j_commit_timer: The timer used to wakeup the commit thread * @j_revoke_lock: Protect the revoke table * @j_revoke: The revoke table - maintains the list of revoked blocks in the * current transaction. * @j_revoke_table: alternate revoke tables for j_revoke * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the * number that will fit in j_blocksize * @j_last_sync_writer: most recent pid which did a synchronous write * @j_history: Buffer storing the transactions statistics history * @j_history_max: Maximum number of transactions in the statistics history * @j_history_cur: Current number of transactions in the statistics history * @j_history_lock: Protect the transactions statistics history * @j_proc_entry: procfs entry for the jbd statistics directory * @j_stats: Overall statistics * @j_private: An opaque pointer to fs-private information. */ struct journal_s { /* General journaling state flags [j_state_lock] */ unsigned long j_flags; /* * Is there an outstanding uncleared error on the journal (from a prior * abort)? [j_state_lock] */ int j_errno; /* The superblock buffer */ struct buffer_head *j_sb_buffer; journal_superblock_t *j_superblock; /* Version of the superblock format */ int j_format_version; /* * Protect the various scalars in the journal */ rwlock_t j_state_lock; /* * Number of processes waiting to create a barrier lock [j_state_lock] */ int j_barrier_count; /* The barrier lock itself */ struct mutex j_barrier; /* * Transactions: The current running transaction... * [j_state_lock] [caller holding open handle] */ transaction_t *j_running_transaction; /* * the transaction we are pushing to disk * [j_state_lock] [caller holding open handle] */ transaction_t *j_committing_transaction; /* * ... and a linked circular list of all transactions waiting for * checkpointing. [j_list_lock] */ transaction_t *j_checkpoint_transactions; /* * 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; /* Wait queue for waiting for commit to complete */ wait_queue_head_t j_wait_done_commit; /* Wait queue to trigger commit */ wait_queue_head_t j_wait_commit; /* Wait queue to wait for updates to complete */ wait_queue_head_t j_wait_updates; /* Wait queue to wait for reserved buffer credits to drop */ wait_queue_head_t j_wait_reserved; /* Semaphore for locking against concurrent checkpoints */ struct mutex j_checkpoint_mutex; /* * 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]; /* * Journal head: identifies the first unused block in the journal. * [j_state_lock] */ unsigned long j_head; /* * Journal tail: identifies the oldest still-used block in the journal. * [j_state_lock] */ unsigned long j_tail; /* * Journal free: how many free blocks are there in the journal? * [j_state_lock] */ unsigned long j_free; /* * Journal start and end: the block numbers of the first usable block * and one beyond the last usable block in the journal. [j_state_lock] */ unsigned long j_first; unsigned long j_last; /* * Device, blocksize and starting block offset for the location where we * store the journal. */ struct block_device *j_dev; int j_blocksize; unsigned long long j_blk_offset; char j_devname[BDEVNAME_SIZE+24]; /* * Device which holds the client fs. For internal journal this will be * equal to j_dev. */ struct block_device *j_fs_dev; /* Total maximum capacity of the journal region on disk. */ unsigned int j_maxlen; /* Number of buffers reserved from the running transaction */ atomic_t j_reserved_credits; /* * Protects the buffer lists and internal buffer state. */ spinlock_t j_list_lock; /* Optional inode where we store the journal. If present, all */ /* journal block numbers are mapped into this inode via */ /* bmap(). */ struct inode *j_inode; /* * Sequence number of the oldest transaction in the log [j_state_lock] */ tid_t j_tail_sequence; /* * Sequence number of the next transaction to grant [j_state_lock] */ tid_t j_transaction_sequence; /* * Sequence number of the most recently committed transaction * [j_state_lock]. */ tid_t j_commit_sequence; /* * Sequence number of the most recent transaction wanting commit * [j_state_lock] */ tid_t j_commit_request; /* * 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]; /* Pointer to the current commit thread for this journal */ struct task_struct *j_task; /* * Maximum number of metadata buffers to allow in a single compound * commit transaction */ int j_max_transaction_buffers; /* * What is the maximum transaction lifetime before we begin a commit? */ unsigned long j_commit_interval; /* The timer used to wakeup the commit thread: */ struct timer_list j_commit_timer; /* * The revoke table: maintains the list of revoked blocks in the * current transaction. [j_revoke_lock] */ spinlock_t j_revoke_lock; struct jbd2_revoke_table_s *j_revoke; struct jbd2_revoke_table_s *j_revoke_table[2]; /* * array of bhs for jbd2_journal_commit_transaction */ struct buffer_head **j_wbuf; int j_wbufsize; /* * this is the pid of hte last person to run a synchronous operation * through the journal */ pid_t j_last_sync_writer; /* * the average amount of time in nanoseconds it takes to commit a * transaction to disk. [j_state_lock] */ u64 j_average_commit_time; /* * minimum and maximum times that we should wait for * additional filesystem operations to get batched into a * synchronous handle in microseconds */ u32 j_min_batch_time; u32 j_max_batch_time; /* This function is called when a transaction is closed */ void (*j_commit_callback)(journal_t *, transaction_t *); /* * Journal statistics */ spinlock_t j_history_lock; struct proc_dir_entry *j_proc_entry; struct transaction_stats_s j_stats; /* Failed journal commit ID */ unsigned int j_failed_commit; /* * An opaque pointer to fs-private information. ext3 puts its * superblock pointer here */ void *j_private; /* Reference to checksum algorithm driver via cryptoapi */ struct crypto_shash *j_chksum_driver; /* Precomputed journal UUID checksum for seeding other checksums */ __u32 j_csum_seed; }; /* 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 */ #define JBD2_REC_ERR 0x080 /* The errno in the sb has been recorded */ /* * 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(journal_t *journal); 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 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, 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, 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 *, int nblocks); 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_hard (journal_t *); 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_file_inode(handle_t *handle, struct jbd2_inode *inode); 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_caches(void); extern int jbd2_journal_init_revoke_caches(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(journal_t *journal, transaction_t *transaction, struct list_head *log_bufs, int write_op); /* 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_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; } /* * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for * transaction control blocks. */ #define JBD2_CONTROL_BLOCKS_SHIFT 5 /* * Return the minimum number of blocks which must be free in the journal * before a new transaction may be started. Must be called under j_state_lock. */ static inline int jbd2_space_needed(journal_t *journal) { int nblocks = journal->j_max_transaction_buffers; return nblocks + (nblocks >> JBD2_CONTROL_BLOCKS_SHIFT); } /* * 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) { unsigned long committing = atomic_read(&journal-> j_committing_transaction->t_outstanding_credits); /* Transaction + control blocks */ free -= committing + (committing >> JBD2_CONTROL_BLOCKS_SHIFT); } 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; } #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 */