[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>

7 files changed, 8 insertions, 8 deletions

diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index c98755dca868..d56c0577c710 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -74,7 +74,7 @@ extern ssize_t cifs_user_write(struct file *file, const char __user *write_data,
                          size_t write_size, loff_t * poffset);
 extern int cifs_lock(struct file *, int, struct file_lock *);
 extern int cifs_fsync(struct file *, struct dentry *, int);
-extern int cifs_flush(struct file *);
+extern int cifs_flush(struct file *, fl_owner_t id);
 extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
 extern const struct file_operations cifs_dir_ops;
 extern int cifs_dir_open(struct inode *inode, struct file *file);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 487ea8b3baaa..b4a18c1cab0a 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1417,7 +1417,7 @@ int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
  * As file closes, flush all cached write data for this inode checking
  * for write behind errors.
  */
-int cifs_flush(struct file *file)
+int cifs_flush(struct file *file, fl_owner_t id)
 {
         struct inode * inode = file->f_dentry->d_inode;
         int rc = 0;
diff --git a/fs/coda/file.c b/fs/coda/file.c
index 7c2642431fa5..cc66c681bd11 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -164,7 +164,7 @@ int coda_open(struct inode *coda_inode, struct file *coda_file)
         return 0;
 }
 
-int coda_flush(struct file *coda_file)
+int coda_flush(struct file *coda_file, fl_owner_t id)
 {
         unsigned short flags = coda_file->f_flags & ~O_EXCL;
         unsigned short coda_flags = coda_flags_to_cflags(flags);
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index fc342cf7c2cc..087f3b734f40 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -169,7 +169,7 @@ static int fuse_release(struct inode *inode, struct file *file)
         return fuse_release_common(inode, file, 0);
 }
 
-static int fuse_flush(struct file *file)
+static int fuse_flush(struct file *file, fl_owner_t id)
 {
         struct inode *inode = file->f_dentry->d_inode;
         struct fuse_conn *fc = get_fuse_conn(inode);
diff --git a/fs/locks.c b/fs/locks.c
index e588e1c265f7..f8a634ac1121 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1907,7 +1907,7 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner)
                 return;
 
         lock.fl_type = F_UNLCK;
-        lock.fl_flags = FL_POSIX;
+        lock.fl_flags = FL_POSIX | FL_CLOSE;
         lock.fl_start = 0;
         lock.fl_end = OFFSET_MAX;
         lock.fl_owner = owner;
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index fade02c15e6e..fa05c027ea11 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -43,7 +43,7 @@ static int  nfs_file_mmap(struct file *, struct vm_area_struct *);
 static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
 static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t);
 static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t);
-static int  nfs_file_flush(struct file *);
+static int  nfs_file_flush(struct file *, fl_owner_t id);
 static int  nfs_fsync(struct file *, struct dentry *dentry, int datasync);
 static int nfs_check_flags(int flags);
 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
@@ -188,7 +188,7 @@ static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
  *
  */
 static int
-nfs_file_flush(struct file *file)
+nfs_file_flush(struct file *file, fl_owner_t id)
 {
         struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
         struct inode    *inode = file->f_dentry->d_inode;
diff --git a/fs/open.c b/fs/open.c
index a37ff861108f..5fb16e5267dc 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1152,7 +1152,7 @@ int filp_close(struct file *filp, fl_owner_t id)
         }
 
         if (filp->f_op && filp->f_op->flush)
-                retval = filp->f_op->flush(filp);
+                retval = filp->f_op->flush(filp, id);
 
         dnotify_flush(filp, id);
         locks_remove_posix(filp, id);