Dear folks, dear Ryusuke,
I've found a bug in the cleanerd/nilfs interaction that might give rise to the
various problems we've seen recently with the cleanerd. It comes down to the
wrong counting of the number of dirty segments and the wrong counting of the
number of checkpoints.
I created this disc using the NiLFS version 2.05 with 2.06 userland (AFAIK)
with mkfs.nilfs and created a sparse file on it with my sparse file generator
I created for UDF testing. It dismounted fine giving a nilfs_dump
`vnd0e-dump-3'. When i remounted it again, the cleanerd started after a while
and after unmounting it gives `vnd03-dump-3-cleanerd'. A diff shows:
(superblock)
--- /root/luiaard/root/vnd0e-dump-3 2009-01-25 17:10:22.000000000 +0100
+++ /root/luiaard/root/vnd0e-dump-3-cleanerd 2009-01-28 17:24:07.000000000
+0100
@@ -7,7 +7,7 @@
Flags 0x0000
CRC seed 0xd4dd3d5a
- Checksum (CRC) 0x05ec6c58 (OK)
+ Checksum (CRC) 0xddd0a2f7 (OK)
Blocksize 4096
Number of segments 499
@@ -17,15 +17,15 @@
Blocks per segment 2048
Reserved segments percent 5
- Last checkpoint number 8
- Last pseg blocknr writen 12288
+ Last checkpoint number 11
+ Last pseg blocknr writen 13726
Seq. number last segment 6
- Free blocks count 1005568
+ Free blocks count 1015808
FS Creation time Sun Jan 25 17:05:10 2009
- FS last mount time Sun Jan 25 17:05:14 2009
- FS last write time Sun Jan 25 17:06:02 2009
+ FS last mount time Wed Jan 28 17:21:25 2009
+ FS last write time Wed Jan 28 17:21:44 2009
- Mount count 1
+ Mount count 2
Max mount count 50
FS state 0x1<VALID_FS>
Error behaviour flags 0x0001
And the su and cp files give:
@@ -30743,34 +31480,34 @@
Reading file `SU.out` for 1 blocks (4 Kb)
SU file dump
- nclean 491
- ndirty 8
+ nclean 496
+ ndirty 21474836483
last alloced 7
Segment 0
- Last modified Sun Jan 25 17:05:28 2009
- Containing nblks 2047
- Flags 0x2<DIRTY>
+ Last modified Thu Jan 1 01:00:00 1970
+ Containing nblks 0
+ Flags 0x0
......
@@ -30789,136 +31526,72 @@
Reading file `CP.out` for 1 blocks (4 Kb)
CP file dump
- Number of checkpoints 8
+ Number of checkpoints 8589934596
Number of snapshots 0
Checkpoint number 1
- Flags 0x0
+ Flags 0x2<INVALID>
Checkpoints in block 0
Created at Sun Jan 25 17:05:10 2009
Blocks incremented 11
Inodes count 3
Blocks count (red.) 9
---------------------
ny idea as to if and why this can happen? Has it been fixed in the meantime?
or could this be a clue as to the wierd behaviour seen by others including the
corruption?
With regards,
Reinoud
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