fuse: don't use inode in fuse_sync_release()

Make fuse_sync_release() a generic helper function that doesn't need a
struct inode pointer.  This makes it suitable for use by CUSE.

Change return value of fuse_release_common() from int to void.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

3 files changed, 36 insertions, 39 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index faa3b2f86740..b3089a083d30 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -362,19 +362,6 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
 }
 
 /*
- * Synchronous release for the case when something goes wrong in CREATE_OPEN
- */
-static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff,
-                              int flags)
-{
-        fuse_release_fill(ff, flags, FUSE_RELEASE);
-        ff->reserved_req->force = 1;
-        fuse_request_send(fc, ff->reserved_req);
-        fuse_put_request(fc, ff->reserved_req);
-        kfree(ff);
-}
-
-/*
  * Atomic create+open operation
  *
  * If the filesystem doesn't support this, then fall back to separate
@@ -452,7 +439,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
                           &outentry.attr, entry_attr_timeout(&outentry), 0);
         if (!inode) {
                 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
-                fuse_sync_release(fc, ff, flags);
+                fuse_sync_release(ff, flags);
                 fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
                 return -ENOMEM;
         }
@@ -462,7 +449,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
         fuse_invalidate_attr(dir);
         file = lookup_instantiate_filp(nd, entry, generic_file_open);
         if (IS_ERR(file)) {
-                fuse_sync_release(fc, ff, flags);
+                fuse_sync_release(ff, flags);
                 return PTR_ERR(file);
         }
         file->private_data = fuse_file_get(ff);
@@ -1108,7 +1095,9 @@ static int fuse_dir_open(struct inode *inode, struct file *file)
 
 static int fuse_dir_release(struct inode *inode, struct file *file)
 {
-        return fuse_release_common(inode, file, 1);
+        fuse_release_common(file, FUSE_RELEASEDIR);
+
+        return 0;
 }
 
 static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 6bdaa55ae613..ab627b40c3ea 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -93,10 +93,9 @@ static void fuse_file_put(struct fuse_file *ff)
 {
         if (atomic_dec_and_test(&ff->count)) {
                 struct fuse_req *req = ff->reserved_req;
-                struct inode *inode = req->misc.release.path.dentry->d_inode;
-                struct fuse_conn *fc = get_fuse_conn(inode);
+
                 req->end = fuse_release_end;
-                fuse_request_send_background(fc, req);
+                fuse_request_send_background(ff->fc, req);
                 kfree(ff);
         }
 }
@@ -164,11 +163,20 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
         return 0;
 }
 
-void fuse_release_fill(struct fuse_file *ff, int flags, int opcode)
+static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
 {
+        struct fuse_conn *fc = ff->fc;
         struct fuse_req *req = ff->reserved_req;
         struct fuse_release_in *inarg = &req->misc.release.in;
 
+        spin_lock(&fc->lock);
+        list_del(&ff->write_entry);
+        if (!RB_EMPTY_NODE(&ff->polled_node))
+                rb_erase(&ff->polled_node, &fc->polled_files);
+        spin_unlock(&fc->lock);
+
+        wake_up_interruptible_sync(&ff->poll_wait);
+
         inarg->fh = ff->fh;
         inarg->flags = flags;
         req->in.h.opcode = opcode;
@@ -178,40 +186,28 @@ void fuse_release_fill(struct fuse_file *ff, int flags, int opcode)
         req->in.args[0].value = inarg;
 }
 
-int fuse_release_common(struct inode *inode, struct file *file, int isdir)
+void fuse_release_common(struct file *file, int opcode)
 {
-        struct fuse_conn *fc;
         struct fuse_file *ff;
         struct fuse_req *req;
 
         ff = file->private_data;
         if (unlikely(!ff))
-                return 0;       /* return value is ignored by VFS */
+                return;
 
-        fc = get_fuse_conn(inode);
         req = ff->reserved_req;
-
-        fuse_release_fill(ff, file->f_flags,
-                          isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
+        fuse_prepare_release(ff, file->f_flags, opcode);
 
         /* Hold vfsmount and dentry until release is finished */
         path_get(&file->f_path);
         req->misc.release.path = file->f_path;
 
-        spin_lock(&fc->lock);
-        list_del(&ff->write_entry);
-        if (!RB_EMPTY_NODE(&ff->polled_node))
-                rb_erase(&ff->polled_node, &fc->polled_files);
-        spin_unlock(&fc->lock);
-
-        wake_up_interruptible_sync(&ff->poll_wait);
         /*
          * Normally this will send the RELEASE request, however if
          * some asynchronous READ or WRITE requests are outstanding,
          * the sending will be delayed.
          */
         fuse_file_put(ff);
-        return 0;
 }
 
 static int fuse_open(struct inode *inode, struct file *file)
@@ -221,7 +217,20 @@ static int fuse_open(struct inode *inode, struct file *file)
 
 static int fuse_release(struct inode *inode, struct file *file)
 {
-        return fuse_release_common(inode, file, 0);
+        fuse_release_common(file, FUSE_RELEASE);
+
+        /* return value is ignored by VFS */
+        return 0;
+}
+
+void fuse_sync_release(struct fuse_file *ff, int flags)
+{
+        WARN_ON(atomic_read(&ff->count) > 1);
+        fuse_prepare_release(ff, flags, FUSE_RELEASE);
+        ff->reserved_req->force = 1;
+        fuse_request_send(ff->fc, ff->reserved_req);
+        fuse_put_request(ff->fc, ff->reserved_req);
+        kfree(ff);
 }
 
 /*
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 429e669d7859..ef2e1f3780b5 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -535,13 +535,12 @@ struct fuse_file *fuse_file_get(struct fuse_file *ff);
 void fuse_file_free(struct fuse_file *ff);
 void fuse_finish_open(struct inode *inode, struct file *file);
 
-/** Fill in ff->reserved_req with a RELEASE request */
-void fuse_release_fill(struct fuse_file *ff, int flags, int opcode);
+void fuse_sync_release(struct fuse_file *ff, int flags);
 
 /**
  * Send RELEASE or RELEASEDIR request
  */
-int fuse_release_common(struct inode *inode, struct file *file, int isdir);
+void fuse_release_common(struct file *file, int opcode);
 
 /**
  * Send FSYNC or FSYNCDIR request