Hi,
I played around with ext4 online defrag on 2.6.31-rc3 and noticed a problem.
The core is this:
# filefrag -v /usr/bin/gimp-2.6
File size of /usr/bin/gimp-2.6 is 4677400 (1142 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 2884963 29
1 29 2890819 2884991 29
2 58 2906960 2890847 62
3 120 2893864 2907021 29
4 149 2898531 2893892 29
5 178 2887012 2898559 28
6 206 2887261 2887039 27
7 233 2888229 2887287 27
8 260 2907727 2888255 49
9 309 2907811 2907775 90
10 399 2889078 2907900 26
11 425 2890641 2889103 26
12 451 2908065 2890666 31
13 482 2908136 2908095 33
14 515 2908170 2908168 54
15 569 2908257 2908223 31
16 600 2908378 2908287 38
17 638 2886399 2908415 25
18 663 2908646 2886423 26
19 689 2909129 2908671 56
20 745 2909186 2909184 62
21 807 2909281 2909247 31
22 838 2902503 2909311 25
23 863 103690 2902527 161
24 1024 109621 103850 118 eof
/usr/bin/gimp-2.6: 25 extents found
ext4 defragmentation for /usr/bin/gimp-2.6
[1/1]/usr/bin/gimp-2.6: 100% extents: 25 -> 25 [ OK ]
Success: [1/1]
(filefrag will output very much the same now)
But now the really interesting part starts: when I copy away
that file (as far as I understand the code, e4defrag allocates
space in /usr/bin too), I get:
cp -a /usr/bin/gimp-2.6{,.defrag} (I have 50% free, so I expect it to find
room):
filefrag -v /usr/bin/gimp-2.6.defrag
File size of /usr/bin/gimp-2.6.defrag is 4677400 (1142 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 452952 40
1 40 439168 452991 32
2 72 442912 439199 32
3 104 448544 442943 32
4 136 449472 448575 32
5 168 453920 449503 32
6 200 429625 453951 31
7 231 430714 429655 31
8 262 435296 430744 31
9 293 454842 435326 31
10 324 436410 454872 29
11 353 426832 436438 28
12 381 453651 426859 27
13 408 447705 453677 25
14 433 436510 447729 23
15 456 442421 436532 23
16 479 451098 442443 23
17 502 447082 451120 22
18 524 451647 447103 22
19 546 437950 451668 21
20 567 439293 437970 21
21 588 454464 439313 21
22 609 455776 454484 21
23 630 454624 455796 20
24 650 450592 454643 18
25 668 451136 450609 18
26 686 452305 451153 18
27 704 427088 452322 16
28 720 427568 427103 16
29 736 427952 427583 16
30 752 427984 427967 16
31 768 650240 427999 256
32 1024 634851 650495 69
33 1093 633344 634919 49 eof
/usr/bin/gimp-2.6.defrag: 34 extents found
Now that I call fragmented! Calling e4defrag again gives me
34->28 and now it moved _parts_
..
24 781 478136 480191 56
25 837 475850 478191 54
26 891 1836751 475903 133
27 1024 1875978 1836883 118 eof
/usr/bin/gimp-2.6.defrag: 28 extents found
This looks really strange to me, is this a problem with my very file system or
a bug?
Greetings, Stephan
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