From patchwork Wed Apr 24 23:38:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dawid Osuchowski X-Patchwork-Id: 13642681 Received: from mout-y-209.mailbox.org (mout-y-209.mailbox.org [91.198.250.237]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0BB102901 for ; Wed, 24 Apr 2024 23:39:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.198.250.237 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714001955; cv=none; b=Zebq0hG3mvAW/8gKpTqVqybTj1E6qenyZCBgTORiapANBCYaNl4s1JT0djmOz7LFCOc5XrDTg8f5TwkQQ0XhN7U9u1E/IeoOGSyNhkqm14RLAa5wH6HFT0/E4kQHc7Yab61w5WcOx7OQkEPZhlKns7HCo2h0hIAvjIyoMRlBS2o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714001955; c=relaxed/simple; bh=FZZzVKO8Bg0bp98Bo7rC6cfFb+v4vpYs4mrMF1b6Nbo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oB23KwRjzaPhWFMG14bMrXzjegRTtLIbS2KUkEvIfZz4zrx8eYNv5ocrrcRlHlKmNwGyU0eYc0hzryEnSzBGQWFKznrJ9CrfcN2CG3ChC3cN7N0/bnNBXl/BFZyLXg2oxCwAUokbwxkUCI96pPpxWH3tSAU1d9ZAnLNsO72VBYA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=osuchow.ski; spf=none smtp.mailfrom=osuchow.ski; arc=none smtp.client-ip=91.198.250.237 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=osuchow.ski Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=osuchow.ski Received: from smtp202.mailbox.org (smtp202.mailbox.org [10.196.197.202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-y-209.mailbox.org (Postfix) with ESMTPS id 4VPwRr3ZfWz9xSb; Thu, 25 Apr 2024 01:39:04 +0200 (CEST) From: Dawid Osuchowski To: linux-fsdevel@vger.kernel.org Cc: viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, Dawid Osuchowski Subject: [PATCH] fs: Create anon_inode_getfile_fmode() Date: Thu, 25 Apr 2024 01:38:59 +0200 Message-ID: <20240424233859.7640-1-linux@osuchow.ski> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: Dawid Osuchowski --- fs/anon_inodes.c | 48 +++++++++++++++++++++++++++++++++++++ include/linux/anon_inodes.h | 3 +++ 2 files changed, 51 insertions(+) diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c index 0496cb5b6eab..6d61d7d1669a 100644 --- a/fs/anon_inodes.c +++ b/fs/anon_inodes.c @@ -148,6 +148,53 @@ struct file *anon_inode_getfile(const char *name, } EXPORT_SYMBOL_GPL(anon_inode_getfile); + +static 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)) + goto err; + + file->f_mode |= f_mode; + + return file; + +err: + return file; +} + +/** + * 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) +{ + return __anon_inode_getfile_fmode(name, fops, priv, + flags, f_mode); +} +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 +318,7 @@ 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); diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h index 93a5f16d03f3..ee55f9c11a16 100644 --- a/include/linux/anon_inodes.h +++ b/include/linux/anon_inodes.h @@ -15,6 +15,9 @@ 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, unsigned int f_mode); struct file *anon_inode_create_getfile(const char *name, const struct file_operations *fops, void *priv, int flags,