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ocfs2: update comments in masklog.h 

In the mainline ocfs2 code, the interface for masklog is in files under
/sys/fs/o2cb/masklog, but the comments in fs/ocfs2/cluster/masklog.h
reference the old /proc interface.  They are out of date.

This patch modifies the comments in cluster/masklog.h, which also provides
a bash script example on how to change the log mask bits.

Signed-off-by: Coly Li <coly.li@suse.de>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
hifive-unleashed-5.1
Coly Li 2009-05-05 20:03:28 +08:00 committed by Joel Becker
parent a46fa684fc
commit 2b53bc7bff
1 changed files with 17 additions and 18 deletions
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35
fs/ocfs2/cluster/masklog.h
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@ -48,34 +48,33 @@
* only emit the appropriage printk() when the caller passes in a constant * only emit the appropriage printk() when the caller passes in a constant
* mask, as is almost always the case. * mask, as is almost always the case.
* *
* All this bitmask nonsense is hidden from the /proc interface so that Joel * All this bitmask nonsense is managed from the files under
* doesn't have an aneurism. Reading the file gives a straight forward * /sys/fs/o2cb/logmask/. Reading the files gives a straightforward
* indication of which bits are on or off: * indication of which bits are allowed (allow) or denied (off/deny).
* ENTRY off * ENTRY deny
* EXIT off * EXIT deny
* TCP off * TCP off
* MSG off * MSG off
* SOCKET off * SOCKET off
* ERROR off * ERROR allow
* NOTICE on * NOTICE allow
* *
* Writing changes the state of a given bit and requires a strictly formatted * Writing changes the state of a given bit and requires a strictly formatted
* single write() call: * single write() call:
* *
* write(fd, "ENTRY on", 8); * write(fd, "allow", 5);
* *
* would turn the entry bit on. "1" is also accepted in the place of "on", and * Echoing allow/deny/off string into the logmask files can flip the bits
* "off" and "0" behave as expected. * on or off as expected; here is the bash script for example:
* *
* Some trivial shell can flip all the bits on or off: * log_mask="/sys/fs/o2cb/log_mask"
* for node in ENTRY EXIT TCP MSG SOCKET ERROR NOTICE; do
* echo allow >"$log_mask"/"$node"
* done
* *
* log_mask="/proc/fs/ocfs2_nodemanager/log_mask" * The debugfs.ocfs2 tool can also flip the bits with the -l option:
* cat $log_mask | ( *
* while read bit status; do * debugfs.ocfs2 -l TCP allow
* # $1 is "on" or "off", say
* echo "$bit $1" > $log_mask
* done
* )
*/ */
/* for task_struct */ /* for task_struct */