Stat output problem

mmhs · 08-09-2012, 02:04 PM

hi guys

i got confused about stat output

stat manual says

File : Size in Bytes
Blocks : Number of blocks used
IO Block : Size in bytes of every block.

when i use stat command for passwd file it says

Code:

~#stat /etc/passwd
 
File: `/etc/passwd'
Size: 999       	Blocks: 8          IO Block: 4096   regular file
Device: ca00h/51712d	Inode: 845         Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2011-05-26 12:14:41.000000000 +0200
Modify: 2011-05-26 12:14:41.000000000 +0200
Change: 2011-05-26 12:14:41.000000000 +0200

size is 999 bytes and every block is 4096 bytes how can this file use 8 blocks ???

8 blocks === 8 * 4096 = 32768

file size should be 32769 bytes to use 8 blocks !!

Kustom42 · 08-09-2012, 03:49 PM

IO Block sizes are usually 4096, it has to do with the way hardware works. Heres a good article that should explain everything to you:

http://www.linuxintro.org/wiki/Block...nd_block_sizes

If you have more questions after that juts let us know.

mmhs · 08-09-2012, 11:20 PM

Quote:

Originally Posted by Kustom42

IO Block sizes are usually 4096, it has to do with the way hardware works. Heres a good article that should explain everything to you:

http://www.linuxintro.org/wiki/Block...nd_block_sizes

If you have more questions after that juts let us know.

thx man

but i'm of the opinion for store a file with 999 bytes you need just one block . why it his example the file with 999 bytes needs 8 blocks ?????

mmhs · 08-10-2012, 12:30 PM

no one ?????

Kustom42 · 08-10-2012, 05:44 PM

8 bit rule, everything is in eights.

rknichols · 08-11-2012, 12:21 PM

Quote:

Originally Posted by mmhs

hi guys

i got confused about stat output

stat manual says

File : Size in Bytes
Blocks : Number of blocks used
IO Block : Size in bytes of every block.

Code:

Size: 999       	Blocks: 8          IO Block: 4096   regular file

I don't know where you found that "stat manual," but what you quoted is not correct. "Blocks" is reporting the number of 512B blocks allocated, and "IO Block" is reporting the file system's blocksize. What you have is 1 filesystem block (the minimum allocation), and that 4096B block uses 8 512B blocks on the device.