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Brian Behlendorf 71c9f0b003 Make kstat.ks_update() callback atomic

Move the kstat ks_update() callback under the ks_lock.  This
enables dynamically sized kstats without modification to the
kstat API.

  * Create a kstat with the KSTAT_FLAG_VIRTUAL flag.
  * Register a ->ks_update() callback which does:
    o Frees any existing ks_data buffer.
    o Set ks_data_size to the kstat array size.
    o Set ks_data to an allocated buffer of size ks_data_size
    o Populate the array of buffers with the required data.

The buffer allocated in the ks_update() callback is guaranteed
to remain allocated and valid while the proc sequence handler
iterates over the buffer.  The lock will not be dropped until
kstat_seq_stop() function is run making it safe for concurrent
access.  To allow the ks_update() callback to perform memory
allocations the lock was changed to a mutex.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

2012-10-23 09:36:19 -07:00

Makefile.in

Add script for builtin module building.

2012-07-26 15:13:09 -07:00

spl-atomic.c

Linux 2.6.39 compat, DEFINE_SPINLOCK()

2011-04-20 12:01:11 -07:00

spl-condvar.c

Debug cv_destroy() with mutex held

2012-09-10 10:23:26 -07:00

spl-cred.c

Add crgetfsuid()/crgetfsgid() helpers