I have several ZFS file systems being served via NFS to lots of NFS
clients. I need to figure out who is writing to what files so did
what most of us do, searched the Internet for a script that someone
else wrote. Found something, tested it out on our Engineer systems
and it worked great for what I want with some minor modifications.
When I went to use it on a production system, I started seeing lots of
errors.
This is what I see:
DATE R/W/D cr_uid: cr_uid cr_gid: cr_gid
cr_ruid: cr_ruid cr_rgid: cr_rgid Path
dtrace: error on enabled probe ID 5 (ID 26645:
fbt:zfs:zfs_write:return): invalid address (0x0) in predicate at DIF
offset 28
dtrace: error on enabled probe ID 5 (ID 26645:
fbt:zfs:zfs_write:return): invalid address (0x0) in predicate at DIF
offset 28
dtrace: error on enabled probe ID 5 (ID 26645:
fbt:zfs:zfs_write:return): invalid address (0x0) in predicate at DIF
offset 28
--------- SNIPPED LOTS of similar errors -----------
2012 Mar 26 12:45:23 D cr_uid: 769 cr_gid: 40
cr_ruid: 769 cr_rgid: 40
2012 Mar 26 12:45:23 D cr_uid: 769 cr_gid: 40
cr_ruid: 769 cr_rgid: 40
dtrace: error on enabled probe ID 3 (ID 26643:
fbt:zfs:zfs_read:return): invalid address (0x0) in predicate at DIF
offset 28
2012 Mar 26 12:45:31 W cr_uid: 769 cr_gid: 40
cr_ruid: 769 cr_rgid: 40
/clients/abc0101/rep/homes/tsgops/LCPPAGNITE/2012-03-23/nitelog.txt
dtrace: error on enabled probe ID 5 (ID 26645:
fbt:zfs:zfs_write:return): invalid address (0x0) in predicate at DIF
offset 28
dtrace: error on enabled probe ID 5 (ID 26645:
fbt:zfs:zfs_write:return): invalid address (0x0) in predicate at DIF
offset 28
dtrace: error on enabled probe ID 5 (ID 26645:
fbt:zfs:zfs_write:return): invalid address (0x0) in predicate at DIF
offset 28
The script is below.
Both the Engineering and production systems are Sol10 Update10. Zpool
versions are different. 15 on the Engineering system and 10 on the
production system. The script is invoked as follows: zfs_user.d
/clients/abc0101/rep/. The really odd things is, if I remove the
'zfs_write' tracing from the script and leave the 'zfs_read' in the
script runs fine, which you would expect since there are no read
related errors above. But if I then simply search and replace read ->
write, I see the errors. The function prototypes for both zfs_read
and zfs_write are identical. So I don't expect that is the problem.
My understanding of DTrace, which is somewhat limited at this point,
is that the 'self->' variables are thread specific so I should not be
causing problems due to multiple invocations by different threads.
It seems to me that I missing something very simple, but I cannot
figure it out. Any thoughts?
#!/usr/sbin/dtrace -s
#pragma D option quiet
BEGIN
{
printf("%20s%20s cr_uid: %5s cr_gid: %5s cr_ruid: %5s cr_rgid: %5s %s\n",
"DATE",
"R/W/D",
"cr_uid",
"cr_gid",
"cr_ruid",
"cr_rgid",
"Path" );
}
zfs_read:entry
{
self->filepath = args[0]->v_path;
self->cred = (cred_t *)args[3];
}
zfs_read:return
/strstr(stringof(self->filepath), $1) != NULL/ {
printf("%20Y%20s cr_uid: %5d cr_gid: %5d cr_ruid: %5d cr_rgid: %5d %s\n",
walltimestamp,
"R",
self->cred->cr_uid,
self->cred->cr_gid,
self->cred->cr_ruid,
self->cred->cr_rgid,
stringof(self->filepath) );
self->filepath = 0;
self->cred = 0;
}
zfs_write:entry
{
self->filepath = args[0]->v_path;
self->cred = (cred_t *)args[3];
}
zfs_write:return
/strstr(stringof(self->filepath), $1) != NULL/ {
printf("%20Y%20s cr_uid: %5d cr_gid: %5d cr_ruid: %5d cr_rgid: %5d %s\n",
walltimestamp,
"W",
self->cred->cr_uid,
self->cred->cr_gid,
self->cred->cr_ruid,
self->cred->cr_rgid,
stringof(self->filepath) );
}
zfs_remove:entry
{
self->filepath = strjoin (stringof(args[0]->v_path), "/");
self->filepath = strjoin ( self->filepath, stringof(args[1]));
self->cred = (cred_t *)args[2];
}
zfs_remove:return
/strstr(stringof(self->filepath), $1) != NULL/ {
printf("%20Y%20s cr_uid: %5d cr_gid: %5d cr_ruid: %5d cr_rgid: %5d %s\n",
walltimestamp,
"D",
self->cred->cr_uid,
self->cred->cr_gid,
self->cred->cr_ruid,
self->cred->cr_rgid,
stringof(self->filepath) );
self->filepath = 0;
}
-----RTU
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