linux-ext4 - working on extent locks for i

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Date:	Thu, 12 Jan 2012 20:01:43 -0700
From:	Allison Henderson <achender@...ux.vnet.ibm.com>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Lukas Czerner <lczerner@...hat.com>
Subject: working on extent locks for i_mutex

Hi All,

I know this is an old topic, but I am poking it again because I've had 
some work items wrap up, and Im planning on picking up on this one 
again.  I am thinking about implementing extent locks to replace 
i_mutex.  So I just wanted to touch base with folks and see what people 
are working on because I know there were some folks out there that were 
thing about doing similar solutions.

A while ago I had done some investigation on where i_mutex is currently 
used, so I did a review and updated my list.  Only one thing had been 
removed, but I will leave the list here since it was a while ago.  Let 
me know if anyone has been working on similar concept.  Thx!

Allison

List of ext4 functions that lock i_mutex:
ext4_sync_file
ext4_fallocate
ext4_move_extents via two helper routines:
     mext_inode_double_lock and mext_inode_double_unlock
ext4_ioctl (for the EXT4_IOC_SETFLAGS ioctl)
ext4_quota_write
ext4_llseek
ext4_end_io_work
ext4_ind_direct_IO (only while calling ext4_flush_completed_IO)

Functions called by vfs with i_mutex locked:
ext4_setattr
ext4_da_writepages
ext4_rmdir
ext4_unlink
ext4_symlink
ext4_link
ext4_rename
ext4_get_block

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