linux/fs/gfs2
Benjamin Marzinski 2e60d7683c GFS2: update freeze code to use freeze/thaw_super on all nodes
The current gfs2 freezing code is considerably more complicated than it
should be because it doesn't use the vfs freezing code on any node except
the one that begins the freeze.  This is because it needs to acquire a
cluster glock before calling the vfs code to prevent a deadlock, and
without the new freeze_super and thaw_super hooks, that was impossible. To
deal with the issue, gfs2 had to do some hacky locking tricks to make sure
that a frozen node couldn't be holding on a lock it needed to do the
unfreeze ioctl.

This patch makes use of the new hooks to simply the gfs2 locking code. Now,
all the nodes in the cluster freeze and thaw in exactly the same way. Every
node in the cluster caches the freeze glock in the shared state.  The new
freeze_super hook allows the freezing node to grab this freeze glock in
the exclusive state without first calling the vfs freeze_super function.
All the nodes in the cluster see this lock change, and call the vfs
freeze_super function. The vfs locking code guarantees that the nodes can't
get stuck holding the glocks necessary to unfreeze the system.  To
unfreeze, the freezing node uses the new thaw_super hook to drop the freeze
glock. Again, all the nodes notice this, reacquire the glock in shared mode
and call the vfs thaw_super function.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2014-11-17 10:36:39 +00:00
..
acl.c GFS2: inline function gfs2_set_mode 2014-03-19 15:53:52 +00:00
acl.h GFS2: Increase the max number of ACLs 2014-03-19 15:16:24 +00:00
aops.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
bmap.c GFS2: Change maxlen variables to size_t 2014-08-21 10:22:23 +01:00
bmap.h GFS2: Clean up journal extent mapping 2014-03-03 13:50:12 +00:00
dentry.c vfs: Remove unnecessary calls of check_submounts_and_drop 2014-10-09 02:38:56 -04:00
dir.c GFS2: Make rename not save dirent location 2014-10-01 14:06:15 +01:00
dir.h GFS2: Make rename not save dirent location 2014-10-01 14:06:15 +01:00
export.c [readdir] constify ->actor 2013-06-29 12:57:05 +04:00
file.c GFS2: Update timestamps on fallocate 2014-11-14 14:16:33 +00:00
gfs2.h
glock.c GFS2: use _RET_IP_ instead of (unsigned long)__builtin_return_address(0) 2014-10-08 09:57:07 +01:00
glock.h GFS2: Don't use ENOBUFS when ENOMEM is the correct error code 2014-01-16 10:31:13 +00:00
glops.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
glops.h GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
incore.h GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
inode.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
inode.h GFS2: Add atomic_open support 2013-06-14 11:17:15 +01:00
Kconfig Finally eradicate CONFIG_HOTPLUG 2013-06-03 14:20:18 -07:00
lock_dlm.c Merge branch 'sched/urgent' into sched/core, to merge fixes before applying new changes 2014-07-28 10:03:00 +02:00
log.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
log.h GFS2: remove transaction glock 2014-05-14 10:04:34 +01:00
lops.c GFS2: lops.c: replace 0 by NULL for pointers 2014-04-28 09:41:55 +01:00
lops.h GFS2: Move log buffer lists into transaction 2014-02-24 16:54:54 +00:00
main.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
Makefile
meta_io.c mm: non-atomically mark page accessed during page cache allocation where possible 2014-06-04 16:54:10 -07:00
meta_io.h GFS2: Fix address space from page function 2014-03-31 17:48:27 +01:00
ops_fstype.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
quota.c GFS2: remove transaction glock 2014-05-14 10:04:34 +01:00
quota.h GFS2: Use RCU/hlist_bl based hash for quotas 2014-01-14 19:27:56 +00:00
recovery.c sched: Remove proliferation of wait_on_bit() action functions 2014-07-16 15:10:39 +02:00
recovery.h GFS2: Move recovery variables to journal structure in memory 2014-03-07 09:14:48 +00:00
rgrp.c GFS2: If we use up our block reservation, request more next time 2014-11-03 19:26:54 +00:00
rgrp.h GFS2: If we use up our block reservation, request more next time 2014-11-03 19:26:54 +00:00
super.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
super.h GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
sys.c This must be about the smallest merge window patch set ever for GFS2. 2014-06-04 08:30:10 -07:00
sys.h GFS2: dlm based recovery coordination 2012-01-11 09:23:05 +00:00
trace_gfs2.h GFS2: Add origin indicator to glock demote tracing 2013-04-10 10:32:05 +01:00
trans.c GFS2: update freeze code to use freeze/thaw_super on all nodes 2014-11-17 10:36:39 +00:00
trans.h GFS2: Split gfs2_trans_add_bh() into two 2013-01-29 10:28:04 +00:00
util.c GFS2: Convert gfs2_lm_withdraw to use fs_err 2014-03-07 09:39:18 +00:00
util.h GFS2: Convert gfs2_lm_withdraw to use fs_err 2014-03-07 09:39:18 +00:00
xattr.c gfs2: use generic posix ACL infrastructure 2014-01-25 23:58:22 -05:00
xattr.h