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move dentry_open() calls up into do_mq_open() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-12-01 17:34:22 -05:00
parent eecec19d9e
commit af4a5372e4
1 changed files with 20 additions and 24 deletions
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44
ipc/mqueue.c
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@ -727,17 +727,16 @@ static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr)
/*
* Invoked when creating a new queue via sys_mq_open
*/
static struct file *do_create(struct ipc_namespace *ipc_ns, struct inode *dir,
static int do_create(struct ipc_namespace *ipc_ns, struct inode *dir,
struct path *path, int oflag, umode_t mode,
struct mq_attr *attr)
{
const struct cred *cred = current_cred();
int ret;
if (attr) {
ret = mq_attr_ok(ipc_ns, attr);
if (ret)
return ERR_PTR(ret);
return ret;
} else {
struct mq_attr def_attr;
@ -747,28 +746,23 @@ static struct file *do_create(struct ipc_namespace *ipc_ns, struct inode *dir,
ipc_ns->mq_msgsize_default);
ret = mq_attr_ok(ipc_ns, &def_attr);
if (ret)
return ERR_PTR(ret);
return ret;
}
ret = vfs_mkobj(path->dentry, mode & ~current_umask(),
return vfs_mkobj(path->dentry, mode & ~current_umask(),
mqueue_create_attr, attr);
if (ret)
return ERR_PTR(ret);
return dentry_open(path, oflag, cred);
}
/* Opens existing queue */
static struct file *do_open(struct path *path, int oflag)
static int do_open(struct path *path, int oflag)
{
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
int acc;
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY))
return ERR_PTR(-EINVAL);
return -EINVAL;
acc = oflag2acc[oflag & O_ACCMODE];
if (inode_permission(d_inode(path->dentry), acc))
return ERR_PTR(-EACCES);
return dentry_open(path, oflag, current_cred());
return inode_permission(d_inode(path->dentry), acc);
}
static int do_mq_open(const char __user *u_name, int oflag, umode_t mode,
@ -805,28 +799,30 @@ static int do_mq_open(const char __user *u_name, int oflag, umode_t mode,
if (oflag & O_CREAT) {
if (d_really_is_positive(path.dentry)) { /* entry already exists */
audit_inode(name, path.dentry, 0);
if (oflag & O_EXCL) {
if (oflag & O_EXCL)
error = -EEXIST;
goto out;
}
filp = do_open(&path, oflag);
else
error = do_open(&path, oflag);
} else {
if (ro) {
error = ro;
goto out;
} else {
audit_inode_parent_hidden(name, root);
error = do_create(ipc_ns, d_inode(root), &path,
oflag, mode, attr);
}
audit_inode_parent_hidden(name, root);
filp = do_create(ipc_ns, d_inode(root), &path,
oflag, mode, attr);
}
} else {
if (d_really_is_negative(path.dentry)) {
error = -ENOENT;
goto out;
} else {
audit_inode(name, path.dentry, 0);
error = do_open(&path, oflag);
}
audit_inode(name, path.dentry, 0);
filp = do_open(&path, oflag);
}
if (error)
goto out;
filp = dentry_open(&path, oflag, current_cred());
if (!IS_ERR(filp))
fd_install(fd, filp);