I'm running a btrfs-debug patch on one of our nodes. This patch prints
calls to btrfs_orphan_add. I'm still waiting for the problem the patch
was intended to trace, but in the logs I found something ceph related
I don't understand:
When I look at the btrfs_orphan_add messages there is one inode that
is updated over and over again. When I count the inodes in my log, I
can see the following distribution (only inodes with more than 500
btrfs_orphan_add calls listed):
#cnt Inode
1117 7403
17218 7457
848 7484
539 7984
1446 9098
635 9346
When I look at the filesysteme, I can see that inode 7457 belongs to:
current/meta/DIR_8/DIR_A/pginfo\u2.8d__0_28D2BFA8
I don't know how the pginfo stuff works, but I really wonder why the
distribution is so uneven.
"strace -f | grep 28D2BFA8" is giving me the this output:
[...]
[pid 3840] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=8, ...}) = 0
[pid 3840] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=8, ...}) = 0
[pid 3840]
truncate("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
0) = 0
[pid 3840] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
[pid 3840] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
[pid 3840] open("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
O_WRONLY|O_CREAT, 0644) = 64
[pid 3841] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=8, ...}) = 0
[pid 3841] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=8, ...}) = 0
[pid 3841]
truncate("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
0) = 0
[pid 3841] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
[pid 3841] stat("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
[pid 3841] open("/ceph/osd.015/current/meta/DIR_2/pginfo\\u2.d6__0_28D16932",
O_WRONLY|O_CREAT, 0644) = 64
[...]
Regards,
Christian
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