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Mark Fasheh 9c7af40b21 ocfs2: throttle back local alloc when low on disk space 
Ocfs2's local allocator disables itself for the duration of a mount point
when it has trouble allocating a large enough area from the primary bitmap.
That can cause performance problems, especially for disks which were only
temporarily full or fragmented. This patch allows for the allocator to
shrink it's window first, before being disabled. Later, it can also be
re-enabled so that any performance drop is minimized.

To do this, we allow the value of osb->local_alloc_bits to be shrunk when
needed. The default value is recorded in a mostly read-only variable so that
we can re-initialize when required.

Locking had to be updated so that we could protect changes to
local_alloc_bits. Mostly this involves protecting various local alloc values
with the osb spinlock. A new state is also added, OCFS2_LA_THROTTLED, which
is used when the local allocator is has shrunk, but is not disabled. If the
available space dips below 1 megabyte, the local alloc file is disabled. In
either case, local alloc is re-enabled 30 seconds after the event, or when
an appropriate amount of bits is seen in the primary bitmap.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
 		2008-10-13 13:57:57 -07:00
..
cluster [PATCH] ocfs2/cluster/netdebug.c: fix warning 2008-08-22 10:56:57 -07:00
dlm SL*B: drop kmem cache argument from constructor 2008-07-26 12:00:07 -07:00
Makefile ocfs2: Allow selection of cluster plug-ins. 2008-04-18 08:56:07 -07:00
alloc.c ocfs2: fiemap support 2008-10-03 17:32:11 -04:00
alloc.h ocfs2: fiemap support 2008-10-03 17:32:11 -04:00
aops.c ocfs2: Fix a bug in direct IO read. 2008-09-10 01:44:08 -07:00
aops.h ocfs2: convert to new aops 2007-10-16 09:42:58 -07:00
buffer_head_io.c ocfs2: clean up bh null checks 2008-01-25 15:05:48 -08:00
buffer_head_io.h [PATCH 1/2] ocfs2: Add group extend for online resize 2008-01-25 14:53:35 -08:00
dcache.c ocfs2: Remove mount/unmount votes 2008-01-25 14:45:34 -08:00
dcache.h ocfs2: Remove special casing for inode creation in ocfs2_dentry_attach_lock() 2006-09-24 13:50:45 -07:00
dir.c ocfs2: correctly set i_blocks after inline dir gets expanded 2008-08-22 11:09:02 -07:00
dir.h ocfs2: Rename cleanups 2007-10-12 11:54:38 -07:00
dlmglue.c ocfs2: fix printk format warnings with OCFS2_FS_STATS=n 2008-07-14 13:57:14 -07:00
dlmglue.h ocfs2: Break out stackglue into modules. 2008-04-18 08:56:05 -07:00
export.c ocfs2: Silence false lockdep warnings 2008-01-25 15:05:44 -08:00
export.h exportfs: make struct export_operations const 2007-10-22 08:13:21 -07:00
extent_map.c ocfs2: fiemap support 2008-10-03 17:32:11 -04:00
extent_map.h ocfs2: fiemap support 2008-10-03 17:32:11 -04:00
file.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
file.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
heartbeat.c ocfs2: Move o2hb functionality into the stack glue. 2008-04-18 08:56:04 -07:00
heartbeat.h ocfs2: Move o2hb functionality into the stack glue. 2008-04-18 08:56:04 -07:00
inode.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
inode.h ocfs2: Silence false lockdep warnings 2008-01-25 15:05:44 -08:00
ioctl.c [PATCH] r/o bind mounts: elevate write count for ioctls() 2008-04-19 00:29:24 -04:00
ioctl.h ocfs2: Convert ocfs2 over to unlocked_ioctl 2008-04-18 08:56:11 -07:00
journal.c ocfs2: Fix sleep-with-spinlock recovery regression 2008-08-22 11:08:38 -07:00
journal.h [PATCH 2/2] ocfs2: Fix race between mount and recovery 2008-07-31 16:21:14 -07:00
localalloc.c ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
localalloc.h ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
locks.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
locks.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
mmap.c ocfs2: Rename ocfs2_meta_[un]lock 2008-01-25 14:46:01 -08:00
mmap.h [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:47 -08:00
namei.c ocfs2: Improve rename locking 2008-04-18 08:56:11 -07:00
namei.h ocfs2: Move directory manipulation code into dir.c 2007-10-12 11:54:36 -07:00
ocfs1_fs_compat.h fs/: Spelling fixes 2008-02-03 17:33:42 +02:00
ocfs2.h ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
ocfs2_fs.h [PATCH 1/2] ocfs2: Add counter in struct ocfs2_dinode to track journal replays 2008-07-31 16:21:13 -07:00
ocfs2_lockid.h ocfs2: Change mlog_bug_on to BUG_ON in ocfs2_lockid.h 2008-04-18 08:56:07 -07:00
ocfs2_lockingver.h ocfs2: Negotiate locking protocol versions. 2008-02-06 16:11:29 -08:00
resize.c ocfs2: Fix an endian bug in online resize. 2008-03-10 15:14:07 -07:00
resize.h [PATCH 2/2] ocfs2: Implement group add for online resize 2008-01-25 15:04:24 -08:00
slot_map.c ocfs2: Abstract out node number queries. 2008-04-18 08:56:04 -07:00
slot_map.h ocfs2: De-magic the in-memory slot map. 2008-04-18 08:56:03 -07:00
stack_o2cb.c ocfs2: Remove ->hangup() from stack glue operations. 2008-06-16 10:46:52 -07:00
stack_user.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
stackglue.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
stackglue.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
suballoc.c ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
suballoc.h ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
super.c ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
super.h ocfs2: use s_maxbytes directly in ocfs2_change_file_space() 2007-08-09 17:25:07 -07:00
symlink.c ocfs2: Allow uid/gid/perm changes of symlinks 2008-04-30 17:09:54 -07:00
symlink.h [PATCH] mark struct inode_operations const 2 2007-02-12 09:48:46 -08:00
sysfile.c ocfs2: Silence false lockdep warnings 2008-01-25 15:05:44 -08:00
sysfile.h [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:47 -08:00
uptodate.c mm: Remove slab destructors from kmem_cache_create(). 2007-07-20 10:11:58 +09:00
uptodate.h ocfs2: implement directory read-ahead 2006-09-20 15:53:40 -07:00
ver.c ocfs2: bump version number 2008-01-25 15:05:46 -08:00
ver.h [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:47 -08:00