K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2009-02-14T23:02:21.029446Z
K 7
svn:log
V 850
MFC r183073:
When attempt is made to suspend a filesystem that is already syspended,
wait until the current suspension is lifted instead of silently returning
success immediately. The consequences of calling vfs_write() resume when
not owning the suspension are not well-defined at best.

Add the vfs_susp_clean() mount method to be called from
vfs_write_resume(). Set it to process_deferred_inactive() for ffs, and
stop calling it manually.

Add the thread flag TDP_IGNSUSP that allows to bypass the suspension
point in the vn_start_write. It is intended for use by VFS in the
situations where the suspender want to do some i/o requiring calls to
vn_start_write(), and this i/o cannot be done later.

Note that addition of the mount method and new struct mount field change
the KBI. This was approved by re and no objections on stable@ were
raised.

END