linux-ext4 - [PATCH] improved filefrag output

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-id: <91100C56-7646-4560-8FF6-B36953B69B16@sun.com>
Date:	Thu, 18 Feb 2010 06:07:23 -0700
From:	Andreas Dilger <adilger@....com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH] improved filefrag output

Attached is a patch to improve the filefrag output.  The most  
important part of the change is that it allows the "extent format"  
output to be used even if the filesystem does not support FIEMAP.   
This is useful for older kernels (i.e. most vendor kernels), or in  
case FIEMAP hasn't been wired into a filesystem yet.

The extent format output is improved to be more similar to that of  
xfs_bmap, so it prints out a range of logical and physical block  
numbers, in addition to the extent length, so that it is easier to see  
where the discontinuities are.  There is also an option to print out  
the extents/lengths in hex, and using a different blocksize (e.g. "- 
b1M" to print in units of 1MB):

$ filefrag -e -b1M "Indiana Jones And The Temple Of Doom.avi"
  ext:     device_logical:        physical_offset: length: flags:
    0:        0..       1:     320566..    320567:      1:
    1:        1..       3:     320866..    320868:      2:
    2:        3..       3:     320768..    320768:      0:
    3:        4..      29:     320870..    320895:     26:
    4:       30..     155:     320898..    321023:    126:
    5:      156..     281:     321026..    321151:    126:
    6:      282..     407:     321154..    321279:    126:
    7:      408..     533:     321282..    321407:    126:
    8:      534..     659:     321410..    321535:    126:

Also included is support for FIEMAP extensions to support multi-device  
filesystems (e.g. Lustre, ZFS, maybe btrfs in the future).

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

Download attachment "e2fsprogs-fiemap-lustre.patch" of type "application/octet-stream" (20492 bytes)