[PATCH] vfs: add lock owner argument to flush operation

Pass the POSIX lock owner ID to the flush operation.

This is useful for filesystems which don't want to store any locking state
in inode->i_flock but want to handle locking/unlocking POSIX locks
internally.  FUSE is one such filesystem but I think it possible that some
network filesystems would need this also.

Also add a flag to indicate that a POSIX locking request was generated by
close(), so filesystems using the above feature won't send an extra locking
request in this case.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 3 insertions, 3 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index ba325f16d07..5f561fce32d 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -82,7 +82,7 @@ static int evdev_fasync(int fd, struct file *file, int on)
         return retval < 0 ? retval : 0;
 }
 
-static int evdev_flush(struct file * file)
+static int evdev_flush(struct file * file, fl_owner_t id)
 {
         struct evdev_list *list = file->private_data;
         if (!list->evdev->exist) return -ENODEV;
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index ce0ba3a174f..4a2fed350d4 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -4724,7 +4724,7 @@ err_out:
 
 
 /* Flush the tape buffer before close */
-static int os_scsi_tape_flush(struct file * filp)
+static int os_scsi_tape_flush(struct file * filp, fl_owner_t id)
 {
         int                   result = 0, result2;
         struct osst_tape    * STp    = filp->private_data;
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index ad87d73f88e..1272dd249af 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -1193,7 +1193,7 @@ static int st_open(struct inode *inode, struct file *filp)
 
 
 /* Flush the tape buffer before close */
-static int st_flush(struct file *filp)
+static int st_flush(struct file *filp, fl_owner_t id)
 {
         int result = 0, result2;
         unsigned char cmd[MAX_COMMAND_SIZE];