BMC/Intel-BMC/linux.git/fs/gfs2/main.c, branch dev

GFS2: update freeze code to use freeze/thaw_super on all nodes

2014-11-17T10:36:39+00:00

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 Signed-off-by: Steven Whitehouse

GFS2: Use pr_ more consistently

2014-03-07T09:30:51+00:00

Add pr_fmt, remove embedded "GFS2: " prefixes. This now consistently emits lower case "gfs2: " for each message. Other miscellanea around these changes: o Add missing newlines o Coalesce formats o Realign arguments Signed-off-by: Joe Perches Signed-off-by: Steven Whitehouse

GFS2: global conversion to pr_foo()

2014-03-06T17:34:06+00:00

-All printk(KERN_foo converted to pr_foo(). -Messages updated to fit in 80 columns. -fs_macros converted as well. -fs_printk removed. Signed-off-by: Fabian Frederick Signed-off-by: Steven Whitehouse

GFS2: Use RCU/hlist_bl based hash for quotas

2014-01-14T19:27:56+00:00

Prior to this patch, GFS2 kept all the quotas for each super block in a single linked list. This is rather slow when there are large numbers of quotas. This patch introduces a hlist_bl based hash table, similar to the one used for glocks. The initial look up of the quota is now lockless in the case where it is already cached, although we still have to take the per quota spinlock in order to bump the ref count. Either way though, this is a big improvement on what was there before. The qd_lock and the per super block list is preserved, for the time being. However it is intended that since this is no longer used for its original role, it should be possible to shrink the number of items on that list in due course and remove the requirement to take qd_lock in qd_get. Signed-off-by: Steven Whitehouse Cc: Abhijith Das Cc: Paul E. McKenney

GFS2: Use generic list_lru for quota

2013-11-04T11:17:49+00:00

By using the generic list_lru code, we can now separate the per sb quota list locking from the lru locking. The lru lock is made into the inner-most lock. As a result of this new lock order, we may occasionally see items on the per-sb quota list which are "dead" so that the two places where we traverse that list are updated to take account of that. As a result of this patch, the gfs2 quota shrinker is now NUMA zone aware, and we are also laying the foundations for further improvments in due course. Signed-off-by: Steven Whitehouse Signed-off-by: Abhijith Das Tested-by: Abhijith Das Cc: Dave Chinner

fs: convert fs shrinkers to new scan/count API

2013-09-10T22:56:31+00:00

Convert the filesystem shrinkers to use the new API, and standardise some of the behaviours of the shrinkers at the same time. For example, nr_to_scan means the number of objects to scan, not the number of objects to free. I refactored the CIFS idmap shrinker a little - it really needs to be broken up into a shrinker per tree and keep an item count with the tree root so that we don't need to walk the tree every time the shrinker needs to count the number of objects in the tree (i.e. all the time under memory pressure). [glommer@openvz.org: fixes for ext4, ubifs, nfs, cifs and glock. Fixes are needed mainly due to new code merged in the tree] [assorted fixes folded in] Signed-off-by: Dave Chinner Signed-off-by: Glauber Costa Acked-by: Mel Gorman Acked-by: Artem Bityutskiy Acked-by: Jan Kara Acked-by: Steven Whitehouse Cc: Adrian Hunter Cc: "Theodore Ts'o" Cc: Adrian Hunter Cc: Al Viro Cc: Artem Bityutskiy Cc: Arve Hjønnevåg Cc: Carlos Maiolino Cc: Christoph Hellwig Cc: Chuck Lever Cc: Daniel Vetter Cc: David Rientjes Cc: Gleb Natapov Cc: Greg Thelen Cc: J. Bruce Fields Cc: Jan Kara Cc: Jerome Glisse Cc: John Stultz Cc: KAMEZAWA Hiroyuki Cc: Kent Overstreet Cc: Kirill A. Shutemov Cc: Marcelo Tosatti Cc: Mel Gorman Cc: Steven Whitehouse Cc: Thomas Hellstrom Cc: Trond Myklebust Signed-off-by: Andrew Morton Signed-off-by: Al Viro

GFS2: WQ_NON_REENTRANT is meaningless and going away

2013-08-19T08:33:01+00:00

dbf2576e37 ("workqueue: make all workqueues non-reentrant") made WQ_NON_REENTRANT no-op and the flag is going away. Remove its usages. This patch doesn't introduce any behavior changes. Signed-off-by: Tejun Heo Signed-off-by: Steven Whitehouse Cc: cluster-devel@redhat.com

GFS2: Fold quota data into the reservations struct

2012-06-06T10:20:22+00:00

This patch moves the ancillary quota data structures into the block reservations structure. This saves GFS2 some time and effort in allocating and deallocating the qadata structure. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse

GFS2: Clean up log write code path

2012-04-24T15:44:34+00:00

Prior to this patch, we have two ways of sending i/o to the log. One of those is used when we need to allocate both the data to be written itself and also a buffer head to submit it. This is done via sb_getblk and friends. This is used mostly for writing log headers. The other method is used when writing blocks which have some in-place counterpart. This is the case for all the metadata blocks which are journalled, and when journaled data is in use, for unescaped journalled data blocks. This patch replaces both of those two methods, and about half a dozen separate i/o submission points with a single i/o submission function. We also go direct to bio rather than using buffer heads, since this allows us to build i/o requests of the maximum size for the block device in question. It also reduces the memory required for flushing the log, which can be very useful in low memory situations. Signed-off-by: Steven Whitehouse

GFS2: Use slab for block reservation memory

2012-04-24T15:44:29+00:00

This patch changes block reservations so it uses slab storage. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse