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authorMark Fasheh <mfasheh@suse.com>2008-07-21 14:29:16 -0700
committerMark Fasheh <mfasheh@suse.com>2008-10-13 13:57:57 -0700
commit53da4939f349d4edd283b043219221ca5b78e4d4 (patch)
tree3e0f8e1bd5474822431cffd1e449df9b639e1772 /fs/ocfs2/locks.c
parenta447c0932445f92ce6f4c1bd020f62c5097a7842 (diff)
downloadop-kernel-dev-53da4939f349d4edd283b043219221ca5b78e4d4.zip
op-kernel-dev-53da4939f349d4edd283b043219221ca5b78e4d4.tar.gz
ocfs2: POSIX file locks support
This is actually pretty easy since fs/dlm already handles the bulk of the work. The Ocfs2 userspace cluster stack module already uses fs/dlm as the underlying lock manager, so I only had to add the right calls. Cluster-aware POSIX locks ("plocks") can be turned off by the same means at UNIX locks - mount with 'noflocks', or create a local-only Ocfs2 volume. Internally, the file system uses two sets of file_operations, depending on whether cluster aware plocks is required. This turns out to be easier than implementing local-only versions of ->lock. Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/locks.c')
-rw-r--r--fs/ocfs2/locks.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/ocfs2/locks.c b/fs/ocfs2/locks.c
index 203f871..544ac62 100644
--- a/fs/ocfs2/locks.c
+++ b/fs/ocfs2/locks.c
@@ -24,6 +24,7 @@
*/
#include <linux/fs.h>
+#include <linux/fcntl.h>
#define MLOG_MASK_PREFIX ML_INODE
#include <cluster/masklog.h>
@@ -32,6 +33,7 @@
#include "dlmglue.h"
#include "file.h"
+#include "inode.h"
#include "locks.h"
static int ocfs2_do_flock(struct file *file, struct inode *inode,
@@ -123,3 +125,16 @@ int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
else
return ocfs2_do_flock(file, inode, cmd, fl);
}
+
+int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
+{
+ struct inode *inode = file->f_mapping->host;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ if (!(fl->fl_flags & FL_POSIX))
+ return -ENOLCK;
+ if (__mandatory_lock(inode))
+ return -ENOLCK;
+
+ return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
+}
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