diff options
| author | Mark Fasheh <mfasheh@suse.com> | 2009-12-07 13:10:48 -0800 |
|---|---|---|
| committer | Joel Becker <joel.becker@oracle.com> | 2010-05-05 18:17:30 -0700 |
| commit | d02f00cc057809d96c044cc72d5b9809d59f7d49 (patch) | |
| tree | 44a6d81ecf9fb4b5aa91c0501a8da2ee36890a38 /fs/ocfs2/cluster | |
| parent | ec20cec7a351584ca6c70ead012e73d61f9a8e04 (diff) | |
| download | lwn-d02f00cc057809d96c044cc72d5b9809d59f7d49.tar.gz lwn-d02f00cc057809d96c044cc72d5b9809d59f7d49.zip | |
ocfs2: allocation reservations
This patch improves Ocfs2 allocation policy by allowing an inode to
reserve a portion of the local alloc bitmap for itself. The reserved
portion (allocation window) is advisory in that other allocation
windows might steal it if the local alloc bitmap becomes
full. Otherwise, the reservations are honored and guaranteed to be
free. When the local alloc window is moved to a different portion of
the bitmap, existing reservations are discarded.
Reservation windows are represented internally by a red-black
tree. Within that tree, each node represents the reservation window of
one inode. An LRU of active reservations is also maintained. When new
data is written, we allocate it from the inodes window. When all bits
in a window are exhausted, we allocate a new one as close to the
previous one as possible. Should we not find free space, an existing
reservation is pulled off the LRU and cannibalized.
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/cluster')
| -rw-r--r-- | fs/ocfs2/cluster/masklog.c | 1 | ||||
| -rw-r--r-- | fs/ocfs2/cluster/masklog.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c index 3bb928a2bf7d..c7fba396392d 100644 --- a/fs/ocfs2/cluster/masklog.c +++ b/fs/ocfs2/cluster/masklog.c @@ -116,6 +116,7 @@ static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = { define_mask(ERROR), define_mask(NOTICE), define_mask(KTHREAD), + define_mask(RESERVATIONS), }; static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, }; diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h index 3dfddbec32f2..fd96e2a2fa56 100644 --- a/fs/ocfs2/cluster/masklog.h +++ b/fs/ocfs2/cluster/masklog.h @@ -119,6 +119,7 @@ #define ML_ERROR 0x0000000100000000ULL /* sent to KERN_ERR */ #define ML_NOTICE 0x0000000200000000ULL /* setn to KERN_NOTICE */ #define ML_KTHREAD 0x0000000400000000ULL /* kernel thread activity */ +#define ML_RESERVATIONS 0x0000000800000000ULL /* ocfs2 alloc reservations */ #define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE) #define MLOG_INITIAL_NOT_MASK (ML_ENTRY|ML_EXIT) |