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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 They are out of date.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>
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@ -48,34 +48,33 @@
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* only emit the appropriage printk() when the caller passes in a constant
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* mask, as is almost always the case.
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*
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* All this bitmask nonsense is hidden from the /proc interface so that Joel
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* doesn't have an aneurism. Reading the file gives a straight forward
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* indication of which bits are on or off:
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* ENTRY off
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* EXIT off
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* All this bitmask nonsense is managed from the files under
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* /sys/fs/o2cb/logmask/. Reading the files gives a straightforward
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* indication of which bits are allowed (allow) or denied (off/deny).
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* ENTRY deny
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* EXIT deny
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* TCP off
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* MSG off
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* SOCKET off
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* ERROR off
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* NOTICE on
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* ERROR allow
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* NOTICE allow
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*
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* Writing changes the state of a given bit and requires a strictly formatted
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* single write() call:
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*
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* write(fd, "ENTRY on", 8);
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* write(fd, "allow", 5);
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*
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* would turn the entry bit on. "1" is also accepted in the place of "on", and
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* "off" and "0" behave as expected.
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* Echoing allow/deny/off string into the logmask files can flip the bits
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* on or off as expected; here is the bash script for example:
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*
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* Some trivial shell can flip all the bits on or off:
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* log_mask="/sys/fs/o2cb/log_mask"
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* for node in ENTRY EXIT TCP MSG SOCKET ERROR NOTICE; do
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* echo allow >"$log_mask"/"$node"
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* done
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*
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* log_mask="/proc/fs/ocfs2_nodemanager/log_mask"
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* cat $log_mask | (
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* while read bit status; do
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* # $1 is "on" or "off", say
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* echo "$bit $1" > $log_mask
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* done
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* )
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* The debugfs.ocfs2 tool can also flip the bits with the -l option:
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*
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* debugfs.ocfs2 -l TCP allow
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*/
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/* for task_struct */
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