From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753972AbbINMfL (ORCPT ); Mon, 14 Sep 2015 08:35:11 -0400 Received: from bhuna.collabora.co.uk ([93.93.135.160]:47276 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752141AbbINMfG (ORCPT ); Mon, 14 Sep 2015 08:35:06 -0400 From: =?UTF-8?q?Emilio=20L=C3=B3pez?= To: gregkh@linuxfoundation.org, olof@lixom.net, kgene@kernel.org, k.kozlowski@samsung.com, linux@roeck-us.net Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, =?UTF-8?q?Emilio=20L=C3=B3pez?= Subject: [PATCH v2 1/3] sysfs: Support is_visible() on binary attributes Date: Mon, 14 Sep 2015 09:34:07 -0300 Message-Id: <1442234049-18637-2-git-send-email-emilio.lopez@collabora.co.uk> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1442234049-18637-1-git-send-email-emilio.lopez@collabora.co.uk> References: <1442234049-18637-1-git-send-email-emilio.lopez@collabora.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org According to the sysfs header file: "The returned value will replace static permissions defined in struct attribute or struct bin_attribute." but this isn't the case, as is_visible is only called on struct attribute only. This patch introduces a new is_bin_visible() function to implement the same functionality for binary attributes, and updates documentation accordingly. Signed-off-by: Emilio López --- Changes from v1: - Don't overload is_visible, introduce is_bin_visible instead as discussed on the list. fs/sysfs/group.c | 17 +++++++++++++++-- include/linux/sysfs.h | 18 ++++++++++++++---- 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 39a0199..51b56e6 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -73,13 +73,26 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj, } if (grp->bin_attrs) { - for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++) { + for (i = 0, bin_attr = grp->bin_attrs; *bin_attr; i++, bin_attr++) { + umode_t mode = (*bin_attr)->attr.mode; + if (update) kernfs_remove_by_name(parent, (*bin_attr)->attr.name); + if (grp->is_bin_visible) { + mode = grp->is_bin_visible(kobj, *bin_attr, i); + if (!mode) + continue; + } + + WARN(mode & ~(SYSFS_PREALLOC | 0664), + "Attribute %s: Invalid permissions 0%o\n", + (*bin_attr)->attr.name, mode); + + mode &= SYSFS_PREALLOC | 0664; error = sysfs_add_file_mode_ns(parent, &(*bin_attr)->attr, true, - (*bin_attr)->attr.mode, NULL); + mode, NULL); if (error) break; } diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 9f65758..2f66050 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -64,10 +64,18 @@ do { \ * a new subdirectory with this name. * @is_visible: Optional: Function to return permissions associated with an * attribute of the group. Will be called repeatedly for each - * attribute in the group. Only read/write permissions as well as - * SYSFS_PREALLOC are accepted. Must return 0 if an attribute is - * not visible. The returned value will replace static permissions - * defined in struct attribute or struct bin_attribute. + * non-binary attribute in the group. Only read/write + * permissions as well as SYSFS_PREALLOC are accepted. Must + * return 0 if an attribute is not visible. The returned value + * will replace static permissions defined in struct attribute. + * @is_bin_visible: + * Optional: Function to return permissions associated with a + * binary attribute of the group. Will be called repeatedly + * for each binary attribute in the group. Only read/write + * permissions as well as SYSFS_PREALLOC are accepted. Must + * return 0 if a binary attribute is not visible. The returned + * value will replace static permissions defined in + * struct bin_attribute. * @attrs: Pointer to NULL terminated list of attributes. * @bin_attrs: Pointer to NULL terminated list of binary attributes. * Either attrs or bin_attrs or both must be provided. @@ -76,6 +84,8 @@ struct attribute_group { const char *name; umode_t (*is_visible)(struct kobject *, struct attribute *, int); + umode_t (*is_bin_visible)(struct kobject *, + struct bin_attribute *, int); struct attribute **attrs; struct bin_attribute **bin_attrs; }; -- 2.1.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: emilio.lopez@collabora.co.uk (=?UTF-8?q?Emilio=20L=C3=B3pez?=) Date: Mon, 14 Sep 2015 09:34:07 -0300 Subject: [PATCH v2 1/3] sysfs: Support is_visible() on binary attributes In-Reply-To: <1442234049-18637-1-git-send-email-emilio.lopez@collabora.co.uk> References: <1442234049-18637-1-git-send-email-emilio.lopez@collabora.co.uk> Message-ID: <1442234049-18637-2-git-send-email-emilio.lopez@collabora.co.uk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org According to the sysfs header file: "The returned value will replace static permissions defined in struct attribute or struct bin_attribute." but this isn't the case, as is_visible is only called on struct attribute only. This patch introduces a new is_bin_visible() function to implement the same functionality for binary attributes, and updates documentation accordingly. Signed-off-by: Emilio L?pez --- Changes from v1: - Don't overload is_visible, introduce is_bin_visible instead as discussed on the list. fs/sysfs/group.c | 17 +++++++++++++++-- include/linux/sysfs.h | 18 ++++++++++++++---- 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 39a0199..51b56e6 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -73,13 +73,26 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj, } if (grp->bin_attrs) { - for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++) { + for (i = 0, bin_attr = grp->bin_attrs; *bin_attr; i++, bin_attr++) { + umode_t mode = (*bin_attr)->attr.mode; + if (update) kernfs_remove_by_name(parent, (*bin_attr)->attr.name); + if (grp->is_bin_visible) { + mode = grp->is_bin_visible(kobj, *bin_attr, i); + if (!mode) + continue; + } + + WARN(mode & ~(SYSFS_PREALLOC | 0664), + "Attribute %s: Invalid permissions 0%o\n", + (*bin_attr)->attr.name, mode); + + mode &= SYSFS_PREALLOC | 0664; error = sysfs_add_file_mode_ns(parent, &(*bin_attr)->attr, true, - (*bin_attr)->attr.mode, NULL); + mode, NULL); if (error) break; } diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 9f65758..2f66050 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -64,10 +64,18 @@ do { \ * a new subdirectory with this name. * @is_visible: Optional: Function to return permissions associated with an * attribute of the group. Will be called repeatedly for each - * attribute in the group. Only read/write permissions as well as - * SYSFS_PREALLOC are accepted. Must return 0 if an attribute is - * not visible. The returned value will replace static permissions - * defined in struct attribute or struct bin_attribute. + * non-binary attribute in the group. Only read/write + * permissions as well as SYSFS_PREALLOC are accepted. Must + * return 0 if an attribute is not visible. The returned value + * will replace static permissions defined in struct attribute. + * @is_bin_visible: + * Optional: Function to return permissions associated with a + * binary attribute of the group. Will be called repeatedly + * for each binary attribute in the group. Only read/write + * permissions as well as SYSFS_PREALLOC are accepted. Must + * return 0 if a binary attribute is not visible. The returned + * value will replace static permissions defined in + * struct bin_attribute. * @attrs: Pointer to NULL terminated list of attributes. * @bin_attrs: Pointer to NULL terminated list of binary attributes. * Either attrs or bin_attrs or both must be provided. @@ -76,6 +84,8 @@ struct attribute_group { const char *name; umode_t (*is_visible)(struct kobject *, struct attribute *, int); + umode_t (*is_bin_visible)(struct kobject *, + struct bin_attribute *, int); struct attribute **attrs; struct bin_attribute **bin_attrs; }; -- 2.1.4