kill struct opendata

Just pass struct file *.  Methods are happier that way...
There's no need to return struct file * from finish_open() now,
so let it return int.  Next: saner prototypes for parts in
namei.c
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Documentation/filesystems/Locking

@@ -63,7 +63,7 @@ ata *);
 	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, u64 len);
 	void (*update_time)(struct inode *, struct timespec *, int);
 	int (*atomic_open)(struct inode *, struct dentry *,
-				struct opendata *, unsigned open_flag,
+				struct file *, unsigned open_flag,
 				umode_t create_mode, int *opened);
 
 locking rules:

Documentation/filesystems/vfs.txt

@@ -365,7 +365,7 @@ struct inode_operations {
 	int (*removexattr) (struct dentry *, const char *);
 	void (*update_time)(struct inode *, struct timespec *, int);
 	int (*atomic_open)(struct inode *, struct dentry *,
-				struct opendata *, unsigned open_flag,
+				struct file *, unsigned open_flag,
 				umode_t create_mode, int *opened);
 };
 

fs/9p/vfs_inode.c

@@ -858,12 +858,11 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 
 static int
 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
-		     struct opendata *od, unsigned flags, umode_t mode,
+		     struct file *file, unsigned flags, umode_t mode,
 		     int *opened)
 {
 	int err;
 	u32 perm;
-	struct file *filp;
 	struct v9fs_inode *v9inode;
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid, *inode_fid;
@@ -880,7 +879,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
 
 	/* Only creates */
 	if (!(flags & O_CREAT) || dentry->d_inode) {
-		finish_no_open(od, res);
+		finish_no_open(file, res);
 		return 1;
 	}
 
@@ -918,16 +917,14 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
 		v9inode->writeback_fid = (void *) inode_fid;
 	}
 	mutex_unlock(&v9inode->v_mutex);
-	filp = finish_open(od, dentry, generic_file_open, opened);
-	if (IS_ERR(filp)) {
-		err = PTR_ERR(filp);
+	err = finish_open(file, dentry, generic_file_open, opened);
+	if (err)
 		goto error;
-	}
 
-	filp->private_data = fid;
+	file->private_data = fid;
 #ifdef CONFIG_9P_FSCACHE
 	if (v9ses->cache)
-		v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
+		v9fs_cache_inode_set_cookie(dentry->d_inode, file);
 #endif
 
 	*opened |= FILE_CREATED;

fs/9p/vfs_inode_dotl.c

@@ -242,14 +242,13 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 
 static int
 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
-			  struct opendata *od, unsigned flags, umode_t omode,
+			  struct file *file, unsigned flags, umode_t omode,
 			  int *opened)
 {
 	int err = 0;
 	gid_t gid;
 	umode_t mode;
 	char *name = NULL;
-	struct file *filp;
 	struct p9_qid qid;
 	struct inode *inode;
 	struct p9_fid *fid = NULL;
@@ -270,7 +269,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 
 	/* Only creates */
 	if (!(flags & O_CREAT) || dentry->d_inode) {
-		finish_no_open(od, res);
+		finish_no_open(file, res);
 		return 1;
 	}
 
@@ -357,15 +356,13 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 	}
 	mutex_unlock(&v9inode->v_mutex);
 	/* Since we are opening a file, assign the open fid to the file */
-	filp = finish_open(od, dentry, generic_file_open, opened);
-	if (IS_ERR(filp)) {
-		err = PTR_ERR(filp);
+	err = finish_open(file, dentry, generic_file_open, opened);
+	if (err)
 		goto err_clunk_old_fid;
-	}
-	filp->private_data = ofid;
+	file->private_data = ofid;
 #ifdef CONFIG_9P_FSCACHE
 	if (v9ses->cache)
-		v9fs_cache_inode_set_cookie(inode, filp);
+		v9fs_cache_inode_set_cookie(inode, file);
 #endif
 	*opened |= FILE_CREATED;
 out:

fs/ceph/dir.c

@@ -635,7 +635,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
 }
 
 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
-		     struct opendata *od, unsigned flags, umode_t mode,
+		     struct file *file, unsigned flags, umode_t mode,
 		     int *opened)
 {
 	int err;
@@ -649,7 +649,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 		if (err < 0)
 			return err;
 
-		return ceph_lookup_open(dir, dentry, od, flags, mode, opened);
+		return ceph_lookup_open(dir, dentry, file, flags, mode, opened);
 	}
 
 	if (d_unhashed(dentry)) {
@@ -663,12 +663,12 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 
 	/* We don't deal with positive dentries here */
 	if (dentry->d_inode) {
-		finish_no_open(od, res);
+		finish_no_open(file, res);
 		return 1;
 	}
 
 	*opened |= FILE_CREATED;
-	err = ceph_lookup_open(dir, dentry, od, flags, mode, opened);
+	err = ceph_lookup_open(dir, dentry, file, flags, mode, opened);
 	dput(res);
 
 	return err;

fs/ceph/file.c

@@ -214,12 +214,11 @@ int ceph_open(struct inode *inode, struct file *file)
  * ceph_release gets called).  So fear not!
  */
 int ceph_lookup_open(struct inode *dir, struct dentry *dentry,
-		     struct opendata *od, unsigned flags, umode_t mode,
+		     struct file *file, unsigned flags, umode_t mode,
 		     int *opened)
 {
 	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 	struct ceph_mds_client *mdsc = fsc->mdsc;
-	struct file *file = NULL;
 	struct ceph_mds_request *req;
 	struct dentry *ret;
 	int err;
@@ -248,9 +247,7 @@ int ceph_lookup_open(struct inode *dir, struct dentry *dentry,
 		err = ceph_handle_notrace_create(dir, dentry);
 	if (err)
 		goto out;
-	file = finish_open(od, req->r_dentry, ceph_open, opened);
-	if (IS_ERR(file))
-		err = PTR_ERR(file);
+	err = finish_open(file, req->r_dentry, ceph_open, opened);
 out:
 	ret = ceph_finish_lookup(req, dentry, err);
 	ceph_mdsc_put_request(req);

fs/ceph/super.h

@@ -807,7 +807,7 @@ extern int ceph_copy_from_page_vector(struct page **pages,
 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
 extern int ceph_open(struct inode *inode, struct file *file);
 extern int ceph_lookup_open(struct inode *dir, struct dentry *dentry,
-			     struct opendata *od, unsigned flags,
+			     struct file *od, unsigned flags,
 			     umode_t mode, int *opened);
 extern int ceph_release(struct inode *inode, struct file *filp);
 

fs/cifs/cifsfs.h

@@ -47,7 +47,7 @@ extern struct inode *cifs_root_iget(struct super_block *);
 extern int cifs_create(struct inode *, struct dentry *, umode_t,
 		       struct nameidata *);
 extern int cifs_atomic_open(struct inode *, struct dentry *,
-			    struct opendata *, unsigned, umode_t,
+			    struct file *, unsigned, umode_t,
 			    int *);
 extern struct dentry *cifs_lookup(struct inode *, struct dentry *,
 				  struct nameidata *);

fs/cifs/dir.c

@@ -378,7 +378,7 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry,
 
 int
 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
-		 struct opendata *od, unsigned oflags, umode_t mode,
+		 struct file *file, unsigned oflags, umode_t mode,
 		 int *opened)
 {
 	int rc;
@@ -405,7 +405,7 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 		if (IS_ERR(res))
 			return PTR_ERR(res);
 
-		finish_no_open(od, res);
+		finish_no_open(file, res);
 		return 1;
 	}
 
@@ -431,9 +431,8 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 	if (rc)
 		goto out;
 
-	filp = finish_open(od, direntry, generic_file_open, opened);
-	if (IS_ERR(filp)) {
-		rc = PTR_ERR(filp);
+	rc = finish_open(file, direntry, generic_file_open, opened);
+	if (rc) {
 		CIFSSMBClose(xid, tcon, fileHandle);
 		goto out;
 	}

fs/fuse/dir.c

@@ -370,7 +370,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
  * 'mknod' + 'open' requests.
  */
 static int fuse_create_open(struct inode *dir, struct dentry *entry,
-			    struct opendata *od, unsigned flags,
+			    struct file *file, unsigned flags,
 			    umode_t mode, int *opened)
 {
 	int err;
@@ -382,7 +382,6 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
 	struct fuse_open_out outopen;
 	struct fuse_entry_out outentry;
 	struct fuse_file *ff;
-	struct file *file;
 
 	forget = fuse_alloc_forget();
 	err = -ENOMEM;
@@ -450,14 +449,12 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
 	d_instantiate(entry, inode);
 	fuse_change_entry_timeout(entry, &outentry);
 	fuse_invalidate_attr(dir);
-	file = finish_open(od, entry, generic_file_open, opened);
-	if (IS_ERR(file)) {
-		err = PTR_ERR(file);
+	err = finish_open(file, entry, generic_file_open, opened);
+	if (err) {
 		fuse_sync_release(ff, flags);
 	} else {
 		file->private_data = fuse_file_get(ff);
 		fuse_finish_open(inode, file);
-		err = 0;
 	}
 	return err;
 
@@ -473,7 +470,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
 
 static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
-			    struct opendata *od, unsigned flags,
+			    struct file *file, unsigned flags,
 			    umode_t mode, int *opened)
 {
 	int err;
@@ -498,7 +495,7 @@ static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
 	if (fc->no_create)
 		goto mknod;
 
-	err = fuse_create_open(dir, entry, od, flags, mode, opened);
+	err = fuse_create_open(dir, entry, file, flags, mode, opened);
 	if (err == -ENOSYS) {
 		fc->no_create = 1;
 		goto mknod;
@@ -512,7 +509,7 @@ static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
 	if (err)
 		goto out_dput;
 no_open:
-	finish_no_open(od, res);
+	finish_no_open(file, res);
 	return 1;
 }
 

fs/internal.h

@@ -82,9 +82,6 @@ extern struct super_block *user_get_super(dev_t);
 /*
  * open.c
  */
-struct opendata {
-	struct file *filp;
-};
 struct open_flags {
 	int open_flag;
 	umode_t mode;

fs/namei.c

@@ -2194,7 +2194,7 @@ static int may_o_create(struct path *dir, struct dentry *dentry, umode_t mode)
 }
 
 static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
-				struct path *path, struct opendata *od,
+				struct path *path, struct file *file,
 				const struct open_flags *op,
 				bool *want_write, bool need_lookup,
 				int *opened)
@@ -2269,9 +2269,9 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
 	if (nd->flags & LOOKUP_DIRECTORY)
 		open_flag |= O_DIRECTORY;
 
-	od->filp->f_path.dentry = DENTRY_NOT_SET;
-	od->filp->f_path.mnt = nd->path.mnt;
-	error = dir->i_op->atomic_open(dir, dentry, od, open_flag, mode,
+	file->f_path.dentry = DENTRY_NOT_SET;
+	file->f_path.mnt = nd->path.mnt;
+	error = dir->i_op->atomic_open(dir, dentry, file, open_flag, mode,
 				      opened);
 	if (error < 0) {
 		if (create_error && error == -ENOENT)
@@ -2287,13 +2287,13 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
 	}
 
 	if (error) {	/* returned 1, that is */
-		if (WARN_ON(od->filp->f_path.dentry == DENTRY_NOT_SET)) {
+		if (WARN_ON(file->f_path.dentry == DENTRY_NOT_SET)) {
 			filp = ERR_PTR(-EIO);
 			goto out;
 		}
-		if (od->filp->f_path.dentry) {
+		if (file->f_path.dentry) {
 			dput(dentry);
-			dentry = od->filp->f_path.dentry;
+			dentry = file->f_path.dentry;
 		}
 		goto looked_up;
 	}
@@ -2302,7 +2302,7 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
 	 * We didn't have the inode before the open, so check open permission
 	 * here.
 	 */
-	filp = od->filp;
+	filp = file;
 	error = may_open(&filp->f_path, acc_mode, open_flag);
 	if (error) {
 		fput(filp);
@@ -2350,7 +2350,7 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
  * was performed, only lookup.
  */
 static struct file *lookup_open(struct nameidata *nd, struct path *path,
-				struct opendata *od,
+				struct file *file,
 				const struct open_flags *op,
 				bool *want_write, int *opened)
 {
@@ -2370,7 +2370,7 @@ static struct file *lookup_open(struct nameidata *nd, struct path *path,
 		goto out_no_open;
 
 	if ((nd->flags & LOOKUP_OPEN) && dir_inode->i_op->atomic_open) {
-		return atomic_open(nd, dentry, path, od, op, want_write,
+		return atomic_open(nd, dentry, path, file, op, want_write,
 				   need_lookup, opened);
 	}
 
@@ -2420,7 +2420,7 @@ static struct file *lookup_open(struct nameidata *nd, struct path *path,
  * Handle the last step of open()
  */
 static struct file *do_last(struct nameidata *nd, struct path *path,
-			    struct opendata *od, const struct open_flags *op,
+			    struct file *file, const struct open_flags *op,
 			    int *opened, const char *pathname)
 {
 	struct dentry *dir = nd->path.dentry;
@@ -2497,7 +2497,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
 
 retry_lookup:
 	mutex_lock(&dir->d_inode->i_mutex);
-	filp = lookup_open(nd, path, od, op, &want_write, opened);
+	filp = lookup_open(nd, path, file, op, &want_write, opened);
 	mutex_unlock(&dir->d_inode->i_mutex);
 
 	if (filp) {
@@ -2604,13 +2604,15 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
 	error = may_open(&nd->path, acc_mode, open_flag);
 	if (error)
 		goto exit;
-	od->filp->f_path.mnt = nd->path.mnt;
-	filp = finish_open(od, nd->path.dentry, NULL, opened);
-	if (IS_ERR(filp)) {
-		if (filp == ERR_PTR(-EOPENSTALE))
+	file->f_path.mnt = nd->path.mnt;
+	error = finish_open(file, nd->path.dentry, NULL, opened);
+	if (error) {
+		filp = ERR_PTR(error);
+		if (error == -EOPENSTALE)
 			goto stale_open;
 		goto out;
 	}
+	filp = file;
 opened:
 	error = open_check_o_direct(filp);
 	if (error)
@@ -2663,17 +2665,17 @@ static struct file *path_openat(int dfd, const char *pathname,
 		struct nameidata *nd, const struct open_flags *op, int flags)
 {
 	struct file *base = NULL;
-	struct opendata od;
+	struct file *file;
 	struct file *res;
 	struct path path;
 	int opened = 0;
 	int error;
 
-	od.filp = get_empty_filp();
-	if (!od.filp)
+	file = get_empty_filp();
+	if (!file)
 		return ERR_PTR(-ENFILE);
 
-	od.filp->f_flags = op->open_flag;
+	file->f_flags = op->open_flag;
 
 	error = path_init(dfd, pathname, flags | LOOKUP_PARENT, nd, &base);
 	if (unlikely(error))
@@ -2684,7 +2686,7 @@ static struct file *path_openat(int dfd, const char *pathname,
 	if (unlikely(error))
 		goto out_filp;
 
-	res = do_last(nd, &path, &od, op, &opened, pathname);
+	res = do_last(nd, &path, file, op, &opened, pathname);
 	while (unlikely(!res)) { /* trailing symlink */
 		struct path link = path;
 		void *cookie;
@@ -2699,7 +2701,7 @@ static struct file *path_openat(int dfd, const char *pathname,
 		error = follow_link(&link, nd, &cookie);
 		if (unlikely(error))
 			goto out_filp;
-		res = do_last(nd, &path, &od, op, &opened, pathname);
+		res = do_last(nd, &path, file, op, &opened, pathname);
 		put_link(nd, &link, cookie);
 	}
 out:
@@ -2708,7 +2710,7 @@ static struct file *path_openat(int dfd, const char *pathname,
 	if (base)
 		fput(base);
 	if (!(opened & FILE_OPENED))
-		put_filp(od.filp);
+		put_filp(file);
 	if (res == ERR_PTR(-EOPENSTALE)) {
 		if (flags & LOOKUP_RCU)
 			res = ERR_PTR(-ECHILD);

fs/nfs/dir.c

@@ -112,7 +112,7 @@ const struct inode_operations nfs3_dir_inode_operations = {
 #ifdef CONFIG_NFS_V4
 
 static int nfs_atomic_open(struct inode *, struct dentry *,
-			   struct opendata *, unsigned, umode_t,
+			   struct file *, unsigned, umode_t,
 			   int *);
 const struct inode_operations nfs4_dir_inode_operations = {
 	.create		= nfs_create,
@@ -1389,10 +1389,9 @@ static int do_open(struct inode *inode, struct file *filp)
 
 static int nfs_finish_open(struct nfs_open_context *ctx,
 			   struct dentry *dentry,
-			   struct opendata *od, unsigned open_flags,
+			   struct file *file, unsigned open_flags,
 			   int *opened)
 {
-	struct file *filp;
 	int err;
 
 	if (ctx->dentry != dentry) {
@@ -1407,13 +1406,10 @@ static int nfs_finish_open(struct nfs_open_context *ctx,
 			goto out;
 	}
 
-	filp = finish_open(od, dentry, do_open, opened);
-	if (IS_ERR(filp)) {
-		err = PTR_ERR(filp);
+	err = finish_open(file, dentry, do_open, opened);
+	if (err)
 		goto out;
-	}
-	nfs_file_set_open_context(filp, ctx);
-	err = 0;
+	nfs_file_set_open_context(file, ctx);
 
 out:
 	put_nfs_open_context(ctx);
@@ -1421,7 +1417,7 @@ static int nfs_finish_open(struct nfs_open_context *ctx,
 }
 
 static int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
-			    struct opendata *od, unsigned open_flags,
+			    struct file *file, unsigned open_flags,
 			    umode_t mode, int *opened)
 {
 	struct nfs_open_context *ctx;
@@ -1497,7 +1493,7 @@ static int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 	nfs_unblock_sillyrename(dentry->d_parent);
 	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 
-	err = nfs_finish_open(ctx, dentry, od, open_flags, opened);
+	err = nfs_finish_open(ctx, dentry, file, open_flags, opened);
 
 	dput(res);
 out:
@@ -1509,7 +1505,7 @@ static int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 	if (IS_ERR(res))
 		goto out;
 
-	finish_no_open(od, res);
+	finish_no_open(file, res);
 	return 1;
 }
 

fs/open.c

@@ -781,21 +781,23 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
  * If the open callback is set to NULL, then the standard f_op->open()
  * filesystem callback is substituted.
  */
-struct file *finish_open(struct opendata *od, struct dentry *dentry,
-			 int (*open)(struct inode *, struct file *),
-			 int *opened)
+int finish_open(struct file *file, struct dentry *dentry,
+		int (*open)(struct inode *, struct file *),
+		int *opened)
 {
 	struct file *res;
 	BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
 
-	mntget(od->filp->f_path.mnt);
+	mntget(file->f_path.mnt);
 	dget(dentry);
 
-	res = do_dentry_open(dentry, od->filp->f_path.mnt, od->filp, open, current_cred());
-	if (!IS_ERR(res))
+	res = do_dentry_open(dentry, file->f_path.mnt, file, open, current_cred());
+	if (!IS_ERR(res)) {
 		*opened |= FILE_OPENED;
+		return 0;
+	}
 
-	return res;
+	return PTR_ERR(res);
 }
 EXPORT_SYMBOL(finish_open);
 
@@ -808,9 +810,9 @@ EXPORT_SYMBOL(finish_open);
  * This can be used to set the result of a successful lookup in ->atomic_open().
  * The filesystem's atomic_open() method shall return NULL after calling this.
  */
-void finish_no_open(struct opendata *od, struct dentry *dentry)
+void finish_no_open(struct file *file, struct dentry *dentry)
 {
-	od->filp->f_path.dentry = dentry;
+	file->f_path.dentry = dentry;
 }
 EXPORT_SYMBOL(finish_no_open);
 

include/linux/fs.h

@@ -427,7 +427,6 @@ struct kstatfs;
 struct vm_area_struct;
 struct vfsmount;
 struct cred;
-struct opendata;
 
 extern void __init inode_init(void);
 extern void __init inode_init_early(void);
@@ -1695,7 +1694,7 @@ struct inode_operations {
 		      u64 len);
 	int (*update_time)(struct inode *, struct timespec *, int);
 	int (*atomic_open)(struct inode *, struct dentry *,
-			   struct opendata *, unsigned open_flag,
+			   struct file *, unsigned open_flag,
 			   umode_t create_mode, int *opened);
 } ____cacheline_aligned;
 
@@ -2069,10 +2068,10 @@ enum {
 	FILE_CREATED = 1,
 	FILE_OPENED = 2
 };
-extern struct file *finish_open(struct opendata *od, struct dentry *dentry,
-				int (*open)(struct inode *, struct file *),
-				int *opened);
-extern void finish_no_open(struct opendata *od, struct dentry *dentry);
+extern int finish_open(struct file *file, struct dentry *dentry,
+			int (*open)(struct inode *, struct file *),
+			int *opened);
+extern void finish_no_open(struct file *file, struct dentry *dentry);
 
 /* fs/ioctl.c */