---559023410-486725371-929753729=:5639
Content-Type: TEXT/PLAIN; charset=US-ASCII
Attached patch does (OK, tries to do) the following:
a) ->f_count became atomic_t. fput() still needs the big lock being held,
but changes of ->f_count outside of big lock are kosher now. Moreover,
fput() is OK if we have two pointers on hands (and thus know that f_count
will be at least 2).
b) ->i_writecount became atomic too. We still depend on the fact that
do_mmap(), get_write_access() and prepare_binfmt() are called with big
lock, but the rest is SMP-safe now.
c) new field added to struct inode: ->i_shared_lock. It's a spinlock and
access to ->i_mmap and the shared areas ring is protected by grabbing it.
We still depend on the fact that do_mmap() and fcntl_setlk() are called
with big lock.
d) shm_open() and shm_close() grab (and release) the big lock.
That makes insert_vm_struct() and merge_segments() SMP-safe. Since
->f_count manipulations are safe too we can remove the lock_kernel() from
many places - see subject ;-)
Folks, give it a look, please. The patch is against 2.3.7-pre9 and I think
that it doesn't open any new races ;-) I would be very grateful if VM
folks would look at it.
Cheers,
Al
---559023410-486725371-929753729=:5639
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