Iwu DEBUGFS - Gosi oge ịmepụta faịlụ na Linux

Na sistemụ Unix dị ka Linux, a na-ewere ihe niile dị ka faịlụ, yana ozi niile gbasara faịlụ (metadata ma ọ bụ njirimara faịlụ dị ka oge okike, mgbanwe ikpeazụ wdg ..), belụsọ na echekwara ọdịnaya faịlụ n'ezie na inode na Linux. na-achọpụta faịlụ ọ bụla site na nọmba inode ya na-abụghị aha faịlụ mmadụ nwere ike ịgụ.

Na mgbakwunye, mgbanwe data ikpeazụ, ohere ikpeazụ, mgbanwe ọnọdụ ikpeazụ na ọtụtụ ndị ọzọ. Anyị ga-ejikọta mmemme abụọ ahụ ka ịchọta oge ịmepụta faịlụ na Linux.

N'isiokwu a, anyị ga-akọwa otu esi achọta otu n'ime àgwà dị oke mkpa nke faịlụ site na iji debugfs na stat mmemme iji nweta ozi okike/ nweta ozi na-esonụ maka faịlụ na Linux faịlụ.

  • oge: na-egosi oge mgbanwe faịlụ.
  • oge: na-egosi oge ịnweta faịlụ.
  • mtime: na-egosi oge mgbanwe faịlụ.
  • crtime: na-egosi oge imepụta faịlụ.

Chọta ụbọchị okike faịlụ na Linux

1. Ịchọta ụbọchị mmepụta faịlụ na oge crtime bụ ịchọta inode nke faịlụ site na iji iwu stat megide faịlụ a na-akpọ About-TecMint.

$ stat About-TecMint 

  File: 'About-TecMint'
  Size: 260       	Blocks: 8          IO Block: 4096   regular file
Device: 80ah/2058d	Inode: 14420015    Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ tecmint)   Gid: ( 1000/ tecmint)
Access: 2017-02-23 14:15:20.263337740 +0530
Modify: 2015-10-22 15:08:25.236299000 +0530
Change: 2016-08-01 10:26:36.603280013 +0530
 Birth: -

N'aka nke ọzọ, ịnwere ike iji iwu ls-i megide faịlụ a na-akpọ About-TecMint.

$ ls -i About-TecMint
 
14420015 About-TecMint

Site na mmepụta nke iwu ndị a dị n'elu, nọmba inode faịlụ bụ 14420015. Biko detuo nọmba inode a pụrụ iche ka anyị ga-eji nọmba inode a na usoro ndị a.

2. Ugbu a, anyị kwesịrị ịchọta usoro faịlụ mgbọrọgwụ nke faịlụ anyị bi, naanị nye iwu df -h na-esonụ iji chọpụta usoro faịlụ mgbọrọgwụ.

$ df -h

Filesystem      Size  Used Avail Use% Mounted on
udev            3.9G     0  3.9G   0% /dev
tmpfs           788M  9.7M  779M   2% /run
/dev/sda10      324G  277G   31G  91% /
tmpfs           3.9G  192M  3.7G   5% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/loop3       87M   87M     0 100% /snap/core/4486
/dev/loop0       87M   87M     0 100% /snap/core/4407
/dev/loop1       82M   82M     0 100% /snap/core/4206
/dev/loop2      181M  181M     0 100% /snap/vlc/190
/dev/loop4      189M  189M     0 100% /snap/vlc/158
cgmfs           100K     0  100K   0% /run/cgmanager/fs
tmpfs           788M   40K  788M   1% /run/user/1000

Site na mmepụta nke dị n'elu, usoro faịlụ maka nkebi mgbọrọgwụ bụ /dev/sda10(dee ndetu nke usoro faịlụ a). Nke a ga-adị iche na sistemụ gị.

3. Ọzọ, jiri iwu debugfs chọta oge okike nke faịlụ a na-akpọ About-TecMint, ya na ọkọlọtọ -R nke na-enye ntụziaka debugfs iji mebie otu iwu mpụga akọwapụtara na nọmba inode 14420015. stat na nke a) wee pụọ.

$ sudo debugfs -R 'stat <14420015>' /dev/sda10

Inode: 14420015   Type: regular    Mode:  0777   Flags: 0x80000
Generation: 2130000141    Version: 0x00000000:00000001
User:  1000   Group:  1000   Size: 260
File ACL: 0    Directory ACL: 0
Links: 1   Blockcount: 8
Fragment:  Address: 0    Number: 0    Size: 0
 ctime: 0x579ed684:8fd54a34 -- Mon Aug  1 10:26:36 2016
 atime: 0x58aea120:3ec8dc30 -- Thu Feb 23 14:15:20 2017
 mtime: 0x5628ae91:38568be0 -- Thu Oct 22 15:08:25 2015
crtime: 0x579ed684:8fd54a34 -- Mon Aug  1 10:26:36 2016
Size of extra inode fields: 32
EXTENTS:
(0):57750808
(END)

Site na mmepụta dị n'elu ọ na-eme ka ọ pụta ìhè na faịlụ About-TecMint ka emepụtara na Mon Aug 1 10:26:36 2016 dị ka e nyere site crtime. Ị ga-ahụkwa oge, oge na mtime nke faịlụ gị.