Konstantin Belousov cc3d8c35f5 There are several code sequences like ... vfs_busy(mp); vfs_write_suspend(mp); which are problematic if other thread starts unmount between two calls. The unmount starts a write, while vfs_write_suspend() drain writers. On the other hand, unmount drains busy references, causing the deadlock. Add a flag argument to vfs_write_suspend and require the callers of it to specify VS_SKIP_UNMOUNT flag, when the call is performed not in the mount path, i.e. the covered vnode is not locked. The suspension is not attempted if VS_SKIP_UNMOUNT is specified and unmount is in progress. Reported and tested by: Andreas Longwitz <longwitz@incore.de> Sponsored by: The FreeBSD Foundation MFC after: 3 weeks		2013-07-09 20:49:32 +00:00
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ffs_alloc.c	Make better use of metadata area by avoiding using it for data blocks	2013-07-02 21:07:08 +00:00
ffs_balloc.c	Make better use of metadata area by avoiding using it for data blocks	2013-07-02 21:07:08 +00:00
ffs_extern.h	Add UFS writesuspension mechanism, designed to allow userland processes	2012-11-18 18:57:19 +00:00
ffs_inode.c	- Convert the bufobj lock to rwlock.	2013-05-31 00:43:41 +00:00
ffs_rawread.c	Do not remap usermode pages into KVA for physio.	2013-03-19 14:43:57 +00:00
ffs_snapshot.c	There are several code sequences like	2013-07-09 20:49:32 +00:00
ffs_softdep.c	- Convert the bufobj lock to rwlock.	2013-05-31 00:43:41 +00:00
ffs_subr.c	- Merge soft-updates journaling from projects/suj/head into head. This	2010-04-24 07:05:35 +00:00
ffs_suspend.c	There are several code sequences like	2013-07-09 20:49:32 +00:00
ffs_tables.c
ffs_vfsops.c	There are several code sequences like	2013-07-09 20:49:32 +00:00
ffs_vnops.c	UFS support of the unmapped i/o for the user data buffers.	2013-03-19 15:08:15 +00:00
fs.h	The purpose of this change to the FFS layout policy is to reduce the	2013-03-22 21:45:28 +00:00
softdep.h	- Speed up pendingblock processing again. Having too much delay between	2011-07-04 22:08:04 +00:00