X File Systems
X File Systems
Procfs
The proc filesystem (procfs) is a special filesystem in Unix-like operating systems that presents information about processes and other system information in a hierarchical file-like structure, providing a more convenient and standardized method for dynamically accessing process data held in the kernel than traditional tracing methods or direct access to kernel memory. Typically, it is mapped to a mount point named /proc at boot time. Wikipedia
root@edison:~# ls /proc/
1 21 290 45 7 93 filesystems sched_debug
10 210 291 4504 70 94 fs schedstat
11 213 292 451 71 95 interrupts scsi
117 214 297 4523 72 96 iomem self
12 218 3 4526 73 asound ioports slabinfo
125 22 30 4545 76 buddyinfo irq softirqs
126 225 309 4549 77 bus kallsyms stat
127 23 310 46 78 cgroups key-users sys
13 244 317 460 8 cmdline keys sysrq-trigger
131 25 321 47 80 consoles kmsg sysvipc
132 251 327 486 82 cpuinfo kpagecount timer_list
14 256 331 492 83 crypto kpageflags timer_stats
142 26 332 5 84 debug_read_history loadavg tty
16 27 387 541 85 devices locks uptime
166 270 43 60 86 diskstats meminfo version
17 276 434 61 87 dma misc vmallocinfo
18 278 4382 62 88 dri modules vmstat
19 28 4383 63 89 driver mounts zoneinfo
2 284 44 65 9 emmc_ipanic_console mtrr
20 286 4457 66 90 emmc_ipanic_header net
200 289 4458 67 91 execdomains pagetypeinfo
205 29 447 69 92 fb partitions
root@edison:~#Devfs
devfs is an obsolete and no longer available virtual filesystem that automatically generated the contents of /dev on some older versions of the Linux kernel. Wikipedia
root@edison:~# ls /dev/
...
char loop7 ram10 tty14 tty42 ttyPTI0
console mcelog ram11 tty15 tty43 ttyPTI1
cpu mem ram12 tty16 tty44 ttymcu0
cpu_dma_latency mid_ipc ram13 tty17 tty45 ttymcu1
disk mmcblk0 ram14 tty18 tty46 ttymcu2
fd mmcblk0boot0 ram15 tty19 tty47 uhid
full mmcblk0boot1 ram2 tty2 tty48 uinput
fuse mmcblk0p1 ram3 tty20 tty49 urandom
i2c-1 mmcblk0p10 ram4 tty21 tty5 usbmon0
i2c-2 mmcblk0p2 ram5 tty22 tty50 vcs
i2c-3 mmcblk0p3 ram6 tty23 tty51 vcs1
i2c-4 mmcblk0p4 ram7 tty24 tty52 vcs2
i2c-5 mmcblk0p5 ram8 tty25 tty53 vcs3
i2c-6 mmcblk0p6 ram9 tty26 tty54 vcs4
i2c-7 mmcblk0p7 random tty27 tty55 vcs5
iio:device0 mmcblk0p8 rfkill tty28 tty56 vcs6
iio:device1 mmcblk0p9 rtc tty29 tty57 vcsa
initctl mmcblk0rpmb rtc0 tty3 tty58 vcsa1
input mmcblk1 shm tty30 tty59 vcsa2
intel_sst_ctrl mqueue snd tty31 tty6 vcsa3
kmem net spidev5.1 tty32 tty60 vcsa4
kmsg network_latency stderr tty33 tty61 vcsa5
log network_throughput stdin tty34 tty62 vcsa6
loop-control null stdout tty35 tty63 vga_arbiter
loop0 nvram tty tty36 tty7 watchdog
loop1 port tty0 tty37 tty8 zero
loop2 pti tty1 tty38 tty9
loop3 ptmx tty10 tty39 ttyGS0
loop4 pts tty11 tty4 ttyMFD0Sysfs
sysfs is a virtual file system provided by the Linux kernel that exports information about various kernel subsystems, hardware devices, and associated device drivers, from the kernel's device model to user space, through virtual files. Wikipedia
/sys/
/sys/fs
/sys/fs/ext4
/sys/fs/fuse
/sys/fs/selinux
/sys/fs/cgroup
/sys/fs/pstore
/sys/bus
/sys/bus/cpu
/sys/bus/i2c
/sys/bus/hid
/sys/bus/iio
/sys/bus/mmc
/sys/bus/pci
/sys/bus/spi
/sys/bus/usb
/sys/bus/usb-serial
/sys/bus/scsi
/sys/bus/sdio
sys/bus/clocksource
/sys/bus/media
/sys/bus/rpmsg
/sys/bus/serio
/sys/bus/machinecheck
/sys/bus/event_source
/sys/bus/workqueue
/sys/bus/pci_express
/sys/bus/virtio
/sys/bus/virtio
/sys/bus/platform
/sys/bus/mdio_bus
/sys/dev
/sys/dev/char
/sys/dev/block
/sys/devices
/sys/devices/cpu
/sys/devices/software
/sys/devices/pci0000:00
/sys/devices/tracepoint
/sys/devices/system
/sys/devices/virtual
/sys/devices/platform
/sys/devices/breakpoint
/sys/block
/sys/block/ram0
/sys/block/ram1
/sys/block/ram2
/sys/block/ram3
/sys/block/ram4
/sys/block/ram5
/sys/block/ram7
/sys/block/ram8
/sys/block/ram9
/sys/block/loop0
/sys/block/loop1
/sys/block/loop2
/sys/block/loop3
/sys/block/loop4
/sys/block/loop5
/sys/block/loop6
/sys/block/loop7
/sys/block/ram10
/sys/block/ram11
/sys/block/ram12
/sys/block/ram13
/sys/block/ram14
/sys/block/ram15
/sys/block/mmcblk0rpmb
/sys/block/mmcblk0boot0
/sys/block/mmcblk0boot1
/sys/block/mmcblk0
/sys/block/mmcblk1
/sys/class
/sys/class/vc
/sys/class/bdi
/sys/class/bsg
/sys/class/dma
/sys/class/dmi
/sys/class/drm
/sys/class/mem
/sys/class/net
/sys/class/msr
/sys/class/pps
/sys/class/ptp
/sys/class/pwm
/sys/class/rtc
/sys/class/udc
/sys/class/tty
/sys/class/mmc_host
/sys/class/scsi_disk
/sys/class/scsi_host
/sys/class/gpio
/sys/class/leds
/sys/class/misc
/sys/class/regulator
/sys/class/devfreq
/sys/class/i2c-dev
/sys/class/block
/sys/class/cpuid
/sys/class/hwmon
/sys/class/input
/sys/class/graphics
/sys/class/sound
/sys/class/spi_master
/sys/class/power_supply
/sys/class/ieee80211
/sys/class/thermal
/sys/class/firmware
/sys/class/scsi_generic
/sys/class/extcon
/sys/class/hidraw
/sys/class/scsi_device
/sys/class/rfkill
/sys/class/spidev
/sys/class/usbmon
/sys/class/vtconsole
/sys/class/backlight
/sys/class/i2c-adapter
/sys/class/video_output
/sys/class/pci_bus
/sys/class/mdio_bus
/sys/class/bluetooth
/sys/class/video4linux
/sys/power
/sys/power/state
/sys/power/wake_unlock
/sys/power/pm_freeze_timeout
/sys/power/pm_print_times
/sys/power/wakeup_count
/sys/power/pm_async
/sys/power/wake_lock
/sys/power/pm_test
/sys/firmware
/sys/firmware/sfi
/sys/firmware/memmap
/sys/kernel
/sys/kernel/mm
/sys/kernel/rcu_expedited
/sys/kernel/slab
/sys/kernel/pmic_debug
/sys/kernel/debug
/sys/kernel/notes
/sys/kernel/kexec_crash_size
/sys/kernel/config
/sys/kernel/fscaps
/sys/kernel/kexec_crash_loaded
/sys/kernel/uevent_helper
/sys/kernel/uevent_seqnum
/sys/kernel/profiling
/sys/kernel/fw_update
/sys/kernel/vmcoreinfo
/sys/kernel/kexec_loaded
/sys/module
/sys/module/sg
/sys/module/vt
/sys/module/mmc_core
/sys/module/brd
/sys/module/drm
/sys/module/hid
/sys/module/nfs
/sys/module/otg
/sys/module/pti
/sys/module/sit
/sys/module/snd
/sys/module/stm
/sys/module/tcp_cubic
/sys/module/asix
/sys/module/bnep
/sys/module/fuse
/sys/module/hidp
/sys/module/ipv6
/sys/module/loop
/sys/module/cfg80211
/sys/module/ramoops
/sys/module/bcm4334x
/sys/module/u_serial
/sys/module/cpuidle
/sys/module/rcutree
/sys/module/dns_resolver
...
/sys/module/usbcore
/sys/module/input_polldev
/sys/module/xz_dec
/sys/module/pcie_aspm
/sys/module/dwc3_intel_mrfl
/sys/module/netconsole
/sys/module/oprofile
/sys/module/cdc_ncm
/sys/module/bluetooth
/sys/module/rcupdate
/sys/module/intel_mid
/sys/module/snd_intel_sst
/sys/module/intel_idle
/sys/module/nf_conntrack
/sys/module/keyboard
/sys/module/xhci_hcd
/sys/module/snd_seq_midi
/sys/module/nf_conntrack_ipv4 root@edison:~# mount
/dev/mmcblk0p8 on / type ext4 (rw,nodev,noatime,discard,noauto_da_alloc,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=491272k,nr_inodes=122818,mode=755)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cg)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
systemd-1 on /boot type autofs (rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
tmpfs on /tmp type tmpfs (rw)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)
systemd-1 on /home type autofs (rw,relatime,fd=31,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
configfs on /sys/kernel/config type configfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
tmpfs on /var/volatile type tmpfs (rw,relatime)
/dev/mmcblk0p5 on /factory type ext4 (ro,nosuid,nodev,noatime,discard,noauto_da_alloc)
/dev/mmcblk0p10 on /home type ext4 (rw,nosuid,nodev,noatime,discard,noauto_da_alloc,data=ordered)
/dev/mmcblk0p7 on /boot type vfat (rw,nosuid,nodev,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortna)Last updated