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8d6884ce9c
freebsd-skq/sys
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Konstantin Belousov 8d6884ce9c When the journaled FFS volume is suspended due to the journal space 
becoming too low, the softdep flush thread processes the workitems,
which frees the space in journal, and then unsuspends the fs.  The
softdep_flush() and other workitem processing functions busy the
filesystem before iterating over the worklist, to prevent the parallel
unmount from freeing the mount data. The vfs_busy() is called with
MBF_NOWAIT flag.

Now, if the unmount is already started and the filesystem is suspended
due to low journal space, the journal is never flushed and filesystem
is never unsuspended, because vfs_busy(MBF_NOWAIT) call cannot succeed
for the unmounting fs, and softdep_flush() does not process the
workitems. Unmount needs to write metadata, where it hangs in the
"suspfs" state.

Move the vn_start_write() call in the dounmount() before setting the
MNTK_UNMOUNT flag. This practically ensures that softdep_flush()
processed the pending journal writes by making dounmount() wait for
the lift of the suspension.

Sponsored by:	The FreeBSD Foundation
Reported and tested by:	pho
MFC after:	2 weeks
2013-03-20 21:07:49 +00:00
..
amd64 Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
arm Integrate Efika MX project back to home. 2013-03-20 15:39:27 +00:00
boot Integrate Efika MX project back to home. 2013-03-20 15:39:27 +00:00
bsm - Implement two new system calls: 2013-03-02 21:11:30 +00:00
cam Commit the removal of a whitespace to record the proper commit message 2013-03-19 15:05:21 +00:00
cddl Plug memory leak in dsl_check_snap_cb() 2013-03-19 07:47:51 +00:00
compat Use m_get/m_gethdr instead of compat macros. 2013-03-15 12:55:30 +00:00
conf Sync back vmcontention branch into HEAD: 2013-03-18 00:25:02 +00:00
contrib Simplify TAILQ usage and avoid additional memory allocations. 2013-03-05 08:08:16 +00:00
crypto When porting XTS-related code from OpenBSD I forgot to update copyright (only 2013-02-20 22:59:53 +00:00
ddb Small textdump enhancements. 2012-11-01 04:07:08 +00:00
dev Integrate Efika MX project back to home. 2013-03-20 15:39:27 +00:00
fs Fix remainder calculation when biosize is not a power of 2 2013-03-19 13:06:11 +00:00
gdb
geom The geom_part provider supports unmapped bio iff the underlying 2013-03-19 14:50:24 +00:00
gnu/fs/reiserfs Garbage collect XFS bits which are now already completely disconnected 2013-03-02 15:33:54 +00:00
i386 Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
ia64 Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
isa
kern When the journaled FFS volume is suspended due to the journal space 2013-03-20 21:07:49 +00:00
kgssapi Piete.Brooks at cl.cam.ac.uk reported via email a crash which was 2012-12-18 00:25:48 +00:00
libkern Add __aeabi_memset to libkern, implemented using memset, as clang may 2013-03-16 23:11:55 +00:00
mips Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
modules Fix the powerpc64 build. MACHINE_CPUARCH is common for powerpc/powerpc64, 2013-03-19 00:39:02 +00:00
net Fix style and comments. 2013-03-19 05:51:47 +00:00
net80211 Add VNET wrappers around the rest of the ieee80211 rtsock messages. 2013-03-20 02:42:52 +00:00
netatalk Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
netgraph Fix compilation warning. 2013-02-15 07:58:51 +00:00
netinet Add ipfw support for setting/matching DiffServ codepoints (DSCP). 2013-03-20 10:35:33 +00:00
netinet6 - Use m_getcl() instead of hand allocating. 2013-03-15 13:48:53 +00:00
netipsec Use m_get2() + m_align() instead of hand made key_alloc_mbuf(). Code 2013-03-15 10:20:15 +00:00
netipx Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
netnatm Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
netpfil Add ipfw support for setting/matching DiffServ codepoints (DSCP). 2013-03-20 10:35:33 +00:00
netsmb Call make_dev_credf() rather than using the couple make_dev()/dev_ref(). 2013-03-09 16:58:19 +00:00
nfs Use m_get() and m_getcl() instead of compat macros. 2013-03-15 10:21:18 +00:00
nfsclient Fix remainder calculation when biosize is not a power of 2 2013-03-19 13:06:11 +00:00
nfsserver Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
nlm Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
ofed Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
opencrypto When porting XTS-related code from OpenBSD I forgot to update copyright (only 2013-02-20 22:59:53 +00:00
pc98 Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
pci Fix build. 2013-02-21 12:52:18 +00:00
powerpc Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
rpc Revert 195703 and 195821 as this special stop handling in NFS is now 2013-03-13 21:06:03 +00:00
security Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
sparc64 Implement the concept of the unmapped VMIO buffers, i.e. buffers which 2013-03-19 14:13:12 +00:00
sys When renaming a directory from one parent directory to another, 2013-03-20 17:57:00 +00:00
teken
tools Further refine the handling of stop signals in the NFS client. The 2013-02-21 19:02:50 +00:00
ufs When renaming a directory from one parent directory to another, 2013-03-20 17:57:00 +00:00
vm Fix the logic inversion in the r248512. 2013-03-20 09:44:23 +00:00
x86 MFcalloutng: 2013-02-28 13:46:03 +00:00
xdr Use m_get() and m_getcl() instead of compat macros. 2013-03-15 10:21:18 +00:00
xen Move the corresponding MTX_SYSINIT() next to their struct mtx declaration 2012-10-26 17:31:35 +00:00
Makefile Remove netncp cscope entry missed in r248097 2013-03-12 14:21:52 +00:00