From patchwork Tue Dec 10 17:02:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Bottomley X-Patchwork-Id: 848943 Received: from bedivere.hansenpartnership.com (bedivere.hansenpartnership.com [96.44.175.130]) (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 A72792327A9; Tue, 10 Dec 2024 17:03:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.44.175.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733850227; cv=none; b=R9JWgqEP5k2nH6n5rZuOPGXq1wA9P1nG3OxTgfZFLVeAMsdzlireACPoFLvi82L/IJp+sTDxZQd345gEP1fvh+gZLST1/VfB03FO6ZuE32Vw1EgGOcWxHmJF6RSrdd8T9NfD8yqnOxv5ke6YZ+CNVe2echUpB4o+lczsCqtLZy4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733850227; c=relaxed/simple; bh=XMUxmN/lKFGxcD+y+4IND8ySLKRc9nUNBYc6o60jlqQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=e7b3MSShwOwiHyWMmvB6UWvQ61/PVuLeOkvZUQ/v7fNcbfPZBmrqxF6+X7FAi4M9yXa4qI+Dv+K7P6+U38EyvGpD0TAS58BoVnFDXwKBqZ8M43RXdjEcn/RGsS3ET4254jZiJ5zAoTzcH2HZLO74f3CjZmzSthKd3f0G///KJek= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=Lopd55rM; arc=none smtp.client-ip=96.44.175.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="Lopd55rM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1733850225; bh=XMUxmN/lKFGxcD+y+4IND8ySLKRc9nUNBYc6o60jlqQ=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References:From; b=Lopd55rMq1j+t2kma0FPBDFYUN9fMUuU7RCvj5nIMadPrhQLk2I8kE8pOV1FrZf// poIfCE1Bd84VcJpPTadTgmxFjdmCw/YEvfXmYv/sqCqmfdXzZpFnjITtOSGmpdH69r wWOsSxmTjDKctiqKVhXbyl7SVjGLXLlKz4LAy+Uk= Received: from localhost (localhost [127.0.0.1]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id 1177912813BB; Tue, 10 Dec 2024 12:03:45 -0500 (EST) Received: from bedivere.hansenpartnership.com ([127.0.0.1]) by localhost (bedivere.hansenpartnership.com [127.0.0.1]) (amavis, port 10024) with ESMTP id kjHLy__HkyvD; Tue, 10 Dec 2024 12:03:44 -0500 (EST) Received: from lingrow.int.hansenpartnership.com (unknown [153.66.160.227]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id 7039412813B6; Tue, 10 Dec 2024 12:03:44 -0500 (EST) From: James Bottomley To: linux-fsdevel@vger.kernel.org, linux-efi@vger.kernel.org Cc: Ard Biesheuvel , Jeremy Kerr Subject: [PATCH 4/6] efivarfs: move freeing of variable entry into evict_inode Date: Tue, 10 Dec 2024 12:02:22 -0500 Message-Id: <20241210170224.19159-5-James.Bottomley@HansenPartnership.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20241210170224.19159-1-James.Bottomley@HansenPartnership.com> References: <20241210170224.19159-1-James.Bottomley@HansenPartnership.com> Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Make the inodes the default management vehicle for struct efivar_entry, so they are now all freed automatically if the file is removed and on unmount in kill_litter_super(). Remove the now superfluous iterator to free the entries after kill_litter_super(). Also fixes a bug where some entry freeing was missing causing efivarfs to leak memory. Signed-off-by: James Bottomley --- fs/efivarfs/internal.h | 1 - fs/efivarfs/super.c | 15 +++++++-------- fs/efivarfs/vars.c | 39 +++------------------------------------ 3 files changed, 10 insertions(+), 45 deletions(-) diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h index 84a36e6fb653..d768bfa7f12b 100644 --- a/fs/efivarfs/internal.h +++ b/fs/efivarfs/internal.h @@ -37,7 +37,6 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *, int efivar_entry_add(struct efivar_entry *entry, struct list_head *head); void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head); -void efivar_entry_remove(struct efivar_entry *entry); int efivar_entry_delete(struct efivar_entry *entry); int efivar_entry_size(struct efivar_entry *entry, unsigned long *size); diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index dc3870ae784b..70b99f58c906 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -41,6 +41,12 @@ static int efivarfs_ops_notifier(struct notifier_block *nb, unsigned long event, static void efivarfs_evict_inode(struct inode *inode) { + struct efivar_entry *entry = inode->i_private; + + if (entry) { + list_del(&entry->list); + kfree(entry); + } clear_inode(inode); } @@ -269,13 +275,6 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, return err; } -static int efivarfs_destroy(struct efivar_entry *entry, void *data) -{ - efivar_entry_remove(entry); - kfree(entry); - return 0; -} - enum { Opt_uid, Opt_gid, }; @@ -398,7 +397,7 @@ static void efivarfs_kill_sb(struct super_block *sb) kill_litter_super(sb); /* Remove all entries and destroy */ - efivar_entry_iter(efivarfs_destroy, &sfi->efivarfs_list, NULL); + WARN_ON(!list_empty(&sfi->efivarfs_list)); kfree(sfi); } diff --git a/fs/efivarfs/vars.c b/fs/efivarfs/vars.c index f6380fdbe173..bda8e8b869e8 100644 --- a/fs/efivarfs/vars.c +++ b/fs/efivarfs/vars.c @@ -485,34 +485,6 @@ void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head) list_add(&entry->list, head); } -/** - * efivar_entry_remove - remove entry from variable list - * @entry: entry to remove from list - * - * Returns 0 on success, or a kernel error code on failure. - */ -void efivar_entry_remove(struct efivar_entry *entry) -{ - list_del(&entry->list); -} - -/* - * efivar_entry_list_del_unlock - remove entry from variable list - * @entry: entry to remove - * - * Remove @entry from the variable list and release the list lock. - * - * NOTE: slightly weird locking semantics here - we expect to be - * called with the efivars lock already held, and we release it before - * returning. This is because this function is usually called after - * set_variable() while the lock is still held. - */ -static void efivar_entry_list_del_unlock(struct efivar_entry *entry) -{ - list_del(&entry->list); - efivar_unlock(); -} - /** * efivar_entry_delete - delete variable and remove entry from list * @entry: entry containing variable to delete @@ -536,12 +508,10 @@ int efivar_entry_delete(struct efivar_entry *entry) status = efivar_set_variable_locked(entry->var.VariableName, &entry->var.VendorGuid, 0, 0, NULL, false); - if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) { - efivar_unlock(); + efivar_unlock(); + if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) return efi_status_to_err(status); - } - efivar_entry_list_del_unlock(entry); return 0; } @@ -679,10 +649,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes, &entry->var.VendorGuid, NULL, size, NULL); - if (status == EFI_NOT_FOUND) - efivar_entry_list_del_unlock(entry); - else - efivar_unlock(); + efivar_unlock(); if (status && status != EFI_BUFFER_TOO_SMALL) return efi_status_to_err(status);