[lkml]   [2009]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject[PATCH 0/1] vfs: umount_begin BKL pushdown v2
Push the BKL acquisition from vfs to every specific filesystems
with hope that it can be eliminated in a second moment.

Filesystems, which support umount_begin(), changed by this patch
are 9p, nfs, cifs and fuse.

Collapsed all patches into only one as requested by Al Viro.

Moved CIFS_SB() down into BKL protected zone as requested by Matthew Wilcox.

It is hard to say if tcon (into cifs's umount_begin() function) should be
protected by BKL. Up to now umount_begin() is always called with BKL held
so in uncertainty I maintain same logic. So I moved unlock_kernel() to at
the bottom of that function as requested by Al Viro and Matthew Wilcox.

About cifs's umount_begin() function I suspect that a deadlock or circular
locking dependency can happens into kill-the-BKL tree if that patch is applied.

 \ /
  Last update: 2009-04-24 09:09    [W:0.092 / U:0.448 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site