Unverified Commit 55394d29 authored by Dawid Osuchowski's avatar Dawid Osuchowski Committed by Christian Brauner
Browse files

fs: Create anon_inode_getfile_fmode() 



Creates an anon_inode_getfile_fmode() function that works similarly to
anon_inode_getfile() with the addition of being able to set the fmode
member.

Signed-off-by: default avatarDawid Osuchowski <linux@osuchow.ski>
Link: https://lore.kernel.org/r/20240426075854.4723-1-linux@osuchow.ski


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 652efdec

fs/anon_inodes.c

+33 −0
Original line number Diff line number Diff line
@@ -148,6 +148,38 @@ struct file *anon_inode_getfile(const char *name, 
}

EXPORT_SYMBOL_GPL(anon_inode_getfile);



/**

 * anon_inode_getfile_fmode - creates a new file instance by hooking it up to an

 *                      anonymous inode, and a dentry that describe the "class"

 *                      of the file

 *

 * @name:    [in]    name of the "class" of the new file

 * @fops:    [in]    file operations for the new file

 * @priv:    [in]    private data for the new file (will be file's private_data)

 * @flags:   [in]    flags

 * @f_mode:  [in]    fmode

 *

 * Creates a new file by hooking it on a single inode. This is useful for files

 * that do not need to have a full-fledged inode in order to operate correctly.

 * All the files created with anon_inode_getfile() will share a single inode,

 * hence saving memory and avoiding code duplication for the file/inode/dentry

 * setup. Allows setting the fmode. Returns the newly created file* or an error

 * pointer.

 */

struct file *anon_inode_getfile_fmode(const char *name,

				const struct file_operations *fops,

				void *priv, int flags, fmode_t f_mode)

{

	struct file *file;



	file = __anon_inode_getfile(name, fops, priv, flags, NULL, false);

	if (!IS_ERR(file))

		file->f_mode |= f_mode;



	return file;

}

EXPORT_SYMBOL_GPL(anon_inode_getfile_fmode);



/**

 * anon_inode_create_getfile - Like anon_inode_getfile(), but creates a new

 *                             !S_PRIVATE anon inode rather than reuse the
@@ -271,6 +303,7 @@ int anon_inode_create_getfd(const char *name, const struct file_operations *fops 
	return __anon_inode_getfd(name, fops, priv, flags, context_inode, true);

}





static int __init anon_inode_init(void)

{

	anon_inode_mnt = kern_mount(&anon_inode_fs_type);

include/linux/anon_inodes.h

+5 −0
Original line number Diff line number Diff line
@@ -9,12 +9,17 @@ 
#ifndef _LINUX_ANON_INODES_H

#define _LINUX_ANON_INODES_H



#include <linux/types.h>



struct file_operations;

struct inode;



struct file *anon_inode_getfile(const char *name,

				const struct file_operations *fops,

				void *priv, int flags);

struct file *anon_inode_getfile_fmode(const char *name,

				const struct file_operations *fops,

				void *priv, int flags, fmode_t f_mode);

struct file *anon_inode_create_getfile(const char *name,

				       const struct file_operations *fops,

				       void *priv, int flags,