in fs/ext2/super.c, in ext2_read_super(), I see :
kdev_t dev = sb->s_dev;
But the super block is not locked, and we read sb->s_dev. Is there a
possibility of race condition?
So what is the exact purpose of lock_super() and unlock_super()? What are the
fields of a super block this lock protects? In other words, when should we
take this lock when using a super block?
Another (silly) question : in include/linux/locks.h (not very commented),
extern inline void lock_super(struct super_block * sb)
{
if (sb->s_lock)
__wait_on_super(sb);
sb->s_lock = 1;
}
Now that AFAIK several kernel threads can simultaneously execute on a SMP
machine, is it possible that 2 kernel threads take this lock at the same
time (for both of them, sb->s_lock could be 0 at this time)?
PS : Sorry for the repost, but it seems that vger has eaten my
previous subscribe, so I haven't seen this post and related answers
Best regards,
Regis "HPReg" Duchesne - Engineering Student at ***** ******** *****
www http://www.via.ecp.fr/~regis/
(O o) I use Linux & 3Com (1135 KB/s over 10Mb/s ethernet)
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