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filters in order.
eg,
f = composite_filter_create(2, regex_filter, persistent_filter);
ownership of the filters passes, they will be destroyed when f's
destroy method is called.
devices {
# first match is final, eg. /dev/ide/cdrom
# get's rejected due to the first pattern
filter=["r/cdrom/", # don't touch the music !
"a/hd[a-d][0-9]+/",
"a/ide/",
"a/sd/",
"a/md/",
"a|loop/[0-9]+|", # accept devfs style loop back
"r/loop/", # and reject old style
"a/dasd/",
"a/dac960/",
"a/nbd/",
"a/ida/",
"a/cciss/",
"a/ubd/",
"r/.*/"] # reject all others
}
Alasdair this is ready to roll into the tools now.
and builds a *very* efficient engine that will tell you which regex a string
matches with only a single pass through the string. To be used in the config
file when specifying devices.
o Anchor's aren't supported yet (^ and $) but that won't take long.
o Also when we get some realistic config files we may want to consider adding an
extra level of indirection to the dfa state in order to compress the table.
It all depends on how large typical tables get.
Things to note:
o Changes to the dm-*.c files have been kept as small as possible during
the development of the new fs interface and there are a few places where
the new code does odd things to give the original code what it wants. These
places will gradually go away during the next few days once we are sure the
new code is sound.
o I've spent most of my testing time looking at the parser since thats where
a lot of the changes are, I've not checked the actual I/O very much, but
then that code hasn't changed at all.
o The print operation in the target type operations is there to help in
debugging and will go away eventually
o There are some other printk's which will also go away once we are sure that
things are working correctly.
o I've tagged the old code with PRE_DMFS if you want to use that until this is
stable.
o There are no kernel patches for this yet (will fix after lunch... :-)
o Makefile needs some changes
o need to EXPORT_SYMBOL(deny_write_access); in ksyms.c
How to use the new interface ?
mount -t dmfs dmfs /mnt/dm
cd /mnt/dm
mkdir fish fish/tank
cd fish/tank
cat ~/my.table > table
cd ..
ln -s tank ACTIVE
Creates a logical volume called fish and activates a table called tank, if
there is a problem doing the link, look in /mnt/dm/fish/tank/errors to see
what is wrong.
If you see any odd things happening, let me know right away as I'm sure there'll
be one or two things that slipped through my testing.
