fiemap ioctl() example by Colin Ian King (2010). gpl2 license.

Small example:

root@trout:~/nlitend/dev/fiemapxz# ls -li total 32 3550986 -rwxr-xr-x 1 root root 21032 Feb 4 17:47 fiemap 3550710 -rw-r--r-- 1 root root 3257 Feb 4 17:44 fiemap.c 3550985 -rw-r--r-- 1 root root 97 Feb 4 17:44 Makefile

root@trout:~/nlitend/dev/fiemapxz# ./fiemap Makefile File Makefile has 1 extents: -# Logical Physical Length Flags 0: 0000000000000000 0000000d8c1cd000 0000000000001000 0001

convert the hex and divide by pagesize:

root@trout:/nlitend/dev/fiemapxz# printf '%d\n' 0x0000000d8c1cd000 58185273344 root@trout:/nlitend/dev/fiemapxz# getconf PAGESIZE 4096 root@trout:~/nlitend/dev/fiemapxz# echo "58185273344 / 4096"|bc 14205389

WALLAH!

root@trout:~/nlitend/dev/fiemapxz# debugfs /dev/sda1 debugfs 1.42.9 (4-Feb-2014) debugfs: icheck 14205389 Block Inode number 14205389 3550985

which is the inode number for Makefile.

root@trout:~/nlitend/dev/fiemapxz# ls -li Makefile 3550985 -rw-r--r-- 1 root root 97 Feb 4 17:44 Makefile

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