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-rw-r--r--fs/ocfs2/dlm/dlmfs.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c
index 77d0df42fe0..ddf55dafba2 100644
--- a/fs/ocfs2/dlm/dlmfs.c
+++ b/fs/ocfs2/dlm/dlmfs.c
@@ -43,6 +43,7 @@
#include <linux/init.h>
#include <linux/string.h>
#include <linux/backing-dev.h>
+#include <linux/poll.h>
#include <asm/uaccess.h>
@@ -98,8 +99,12 @@ static const struct dlm_protocol_version user_locking_protocol = {
* The ABI features are local to this machine's dlmfs mount. This is
* distinct from the locking protocol, which is concerned with inter-node
* interaction.
+ *
+ * Capabilities:
+ * - bast : POLLIN against the file descriptor of a held lock
+ * signifies a bast fired on the lock.
*/
-#define DLMFS_CAPABILITIES ""
+#define DLMFS_CAPABILITIES "bast"
extern int param_set_dlmfs_capabilities(const char *val,
struct kernel_param *kp)
{
@@ -215,6 +220,22 @@ static int dlmfs_file_release(struct inode *inode,
return 0;
}
+static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
+{
+ int event = 0;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct dlmfs_inode_private *ip = DLMFS_I(inode);
+
+ poll_wait(file, &ip->ip_lockres.l_event, wait);
+
+ spin_lock(&ip->ip_lockres.l_lock);
+ if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED)
+ event = POLLIN | POLLRDNORM;
+ spin_unlock(&ip->ip_lockres.l_lock);
+
+ return event;
+}
+
static ssize_t dlmfs_file_read(struct file *filp,
char __user *buf,
size_t count,
@@ -585,6 +606,7 @@ static int dlmfs_fill_super(struct super_block * sb,
static const struct file_operations dlmfs_file_operations = {
.open = dlmfs_file_open,
.release = dlmfs_file_release,
+ .poll = dlmfs_file_poll,
.read = dlmfs_file_read,
.write = dlmfs_file_write,
};