[ext2resize] [PATCH][RFC] Ext3 online resizing locking issue (Again)

[Glauber de O. C. <go...@br...>]

Hi.

Here is my new trial for the resize lock issue. 
Basically, it goes as follows: 

To ensure that only one resizer is running at a time, I added a global
lock that is acquired in the very beginning of ext3_group_add and
ext3_group_extend. 

lock_super is now only used in ext3_group_add in the moment we alter
s_groups_count, and released after the super block is marked dirty.

In ext3_group_extend, this is done outside the main function, so we can
do it trusting the lock to be already held while in remount, or
acquiring it explicitly while in ioctl. 

The lock in ext3_setup_new_group_blocks was simply wiped out, since this
is always called from one of the functions that already holds the lock
(and thus, in a safe environment)

Signed-off-by: Glauber de Oliveira Costa <go...@br...>


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Glauber de Oliveira Costa
IBM Linux Technology Center - Brazil
go...@br...
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