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SubjectRe: [PATCH] ACL supports to mqueue
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On Thu, Nov 3, 2011 at 7:26 PM, Tetsuo Handa
<penguin-kernel@i-love.sakura.ne.jp> wrote:
> I'm not the person to judge the need of this feature, but
>
> | +static const struct inode_operations mqueue_inode_operations = {
> | +#ifdef CONFIG_MQUEUE_POSIX_ACL
> | +     .setxattr    = generic_setxattr,
> | +     .getxattr    = generic_getxattr,
> | +     .listxattr   = generic_listxattr,
> | +     .removexattr = generic_removexattr,
> | +     .check_acl   = generic_check_acl,
> | +     .setattr     = mqueue_setattr,
> | +#endif
> |  };
>
> no need to define mqueue_inode_operations if !CONFIG_MQUEUE_POSIX_ACL. ;-)

Thank you Tetsuo Handa.
The fixed patch is listed in line below.
-----
This patch adds ACL supports to mqueue filesystem.
Based on Linux 3.0.4.

Signed-off-by: Zhou Peng <zhoupeng@nfs.iscas.ac.cn>

diff --git a/fs/Kconfig b/fs/Kconfig
index 19891aa..dbf0aca 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -151,6 +151,14 @@ config TMPFS_XATTR

If unsure, say N.

+config MQUEUE_POSIX_ACL
+ bool "Mqueue POSIX Access Control Lists support"
+ depends on POSIX_MQUEUE
+ select GENERIC_ACL
+ help
+ Mqueue is a file system which is used to suport POSIX msg queue.
+ Say y to get Access Control Lists support for mqueue file system.
+
config HUGETLBFS
bool "HugeTLB file system support"
depends on X86 || IA64 || SPARC64 || (S390 && 64BIT) || \
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 14fb6d6..73cdee2 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -10,6 +10,9 @@
*
* Audit: George Wilson (ltcgcw@us.ibm.com)
*
+ * ACL:
+ * Copyright (c) 2011 Zhou Peng (ailvpeng25@gmail.com)
+ *
* This file is released under the GPL.
*/

@@ -33,6 +36,9 @@
#include <linux/pid.h>
#include <linux/ipc_namespace.h>
#include <linux/slab.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/generic_acl.h>

#include <net/sock.h>
#include "util.h"
@@ -76,6 +82,9 @@ struct mqueue_inode_info {
};

static const struct inode_operations mqueue_dir_inode_operations;
+#ifdef CONFIG_MQUEUE_POSIX_ACL
+static const struct inode_operations mqueue_inode_operations;
+#endif
static const struct file_operations mqueue_file_operations;
static const struct super_operations mqueue_super_ops;
static void remove_notification(struct mqueue_inode_info *info);
@@ -84,6 +93,14 @@ static struct kmem_cache *mqueue_inode_cachep;

static struct ctl_table_header * mq_sysctl_table;

+#ifdef CONFIG_MQUEUE_POSIX_ACL
+static const struct xattr_handler *mqueue_xattr_handlers[] = {
+ &generic_acl_access_handler,
+ &generic_acl_default_handler,
+ NULL
+};
+#endif
+
static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode)
{
return container_of(inode, struct mqueue_inode_info, vfs_inode);
@@ -122,12 +139,19 @@ static struct inode *mqueue_get_inode(struct
super_block *sb,
inode->i_gid = current_fsgid();
inode->i_mtime = inode->i_ctime = inode->i_atime =
CURRENT_TIME;
+#ifdef CONFIG_MQUEUE_POSIX_ACL
+ cache_no_acl(inode);
+#endif

if (S_ISREG(mode)) {
struct mqueue_inode_info *info;
struct task_struct *p = current;
unsigned long mq_bytes, mq_msg_tblsz;

+#ifdef CONFIG_MQUEUE_POSIX_ACL
+ inode->i_op = &mqueue_inode_operations;
+#endif
+
inode->i_fop = &mqueue_file_operations;
inode->i_size = FILENT_SIZE;
/* mqueue specific info */
@@ -192,6 +216,11 @@ static int mqueue_fill_super(struct super_block
*sb, void *data, int silent)
sb->s_magic = MQUEUE_MAGIC;
sb->s_op = &mqueue_super_ops;

+#ifdef CONFIG_MQUEUE_POSIX_ACL
+ sb->s_xattr = mqueue_xattr_handlers;
+ sb->s_flags |= MS_POSIXACL;
+#endif
+
inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO,
NULL);
if (!inode) {
@@ -322,6 +351,16 @@ static int mqueue_create(struct inode *dir,
struct dentry *dentry,
goto out_unlock;
}

+#ifdef CONFIG_MQUEUE_POSIX_ACL
+ error = generic_acl_init(inode, dir);
+ if (error) {
+ iput(inode);
+ spin_lock(&mq_lock);
+ ipc_ns->mq_queues_count--;
+ goto out_unlock;
+ }
+#endif
+
put_ipc_ns(ipc_ns);
dir->i_size += DIRENT_SIZE;
dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
@@ -1217,11 +1256,47 @@ out:
return ret;
}

+#ifdef CONFIG_MQUEUE_POSIX_ACL
+static int mqueue_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ error = simple_setattr(dentry, attr);
+ if (error)
+ return error;
+
+ if (attr->ia_valid & ATTR_MODE)
+ error = generic_acl_chmod(inode);
+
+ return error;
+}
+#endif
+
static const struct inode_operations mqueue_dir_inode_operations = {
.lookup = simple_lookup,
.create = mqueue_create,
.unlink = mqueue_unlink,
+#ifdef CONFIG_MQUEUE_POSIX_ACL
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = generic_listxattr,
+ .removexattr = generic_removexattr,
+ .check_acl = generic_check_acl,
+ .setattr = mqueue_setattr,
+#endif
+};
+
+#ifdef CONFIG_MQUEUE_POSIX_ACL
+static const struct inode_operations mqueue_inode_operations = {
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = generic_listxattr,
+ .removexattr = generic_removexattr,
+ .check_acl = generic_check_acl,
+ .setattr = mqueue_setattr,
};
+#endif

static const struct file_operations mqueue_file_operations = {
.flush = mqueue_flush_file,
--
Zhou Peng
--
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