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switch dentry_open() to struct path, make it grab references itself

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-06-26 21:58:53 +04:00
parent bf349a4470
commit 765927b2d5
15 changed files with 106 additions and 151 deletions
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117
ipc/mqueue.c
View file

@ -721,8 +721,8 @@ 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 dentry *dir,
struct dentry *dentry, int oflag, umode_t mode,
static struct file *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();
@ -732,9 +732,9 @@ static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir,
if (attr) {
ret = mq_attr_ok(ipc_ns, attr);
if (ret)
goto out;
return ERR_PTR(ret);
/* store for use during create */
dentry->d_fsdata = attr;
path->dentry->d_fsdata = attr;
} else {
struct mq_attr def_attr;
@ -744,71 +744,51 @@ static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir,
ipc_ns->mq_msgsize_default);
ret = mq_attr_ok(ipc_ns, &def_attr);
if (ret)
goto out;
return ERR_PTR(ret);
}
mode &= ~current_umask();
ret = mnt_want_write(ipc_ns->mq_mnt);
ret = mnt_want_write(path->mnt);
if (ret)
goto out;
ret = vfs_create(dir->d_inode, dentry, mode, true);
dentry->d_fsdata = NULL;
if (ret)
goto out_drop_write;
result = dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
return ERR_PTR(ret);
ret = vfs_create(dir, path->dentry, mode, true);
path->dentry->d_fsdata = NULL;
if (!ret)
result = dentry_open(path, oflag, cred);
else
result = ERR_PTR(ret);
/*
* dentry_open() took a persistent mnt_want_write(),
* so we can now drop this one.
*/
mnt_drop_write(ipc_ns->mq_mnt);
mnt_drop_write(path->mnt);
return result;
out_drop_write:
mnt_drop_write(ipc_ns->mq_mnt);
out:
dput(dentry);
mntput(ipc_ns->mq_mnt);
return ERR_PTR(ret);
}
/* Opens existing queue */
static struct file *do_open(struct ipc_namespace *ipc_ns,
struct dentry *dentry, int oflag)
static struct file *do_open(struct path *path, int oflag)
{
int ret;
const struct cred *cred = current_cred();
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
ret = -EINVAL;
goto err;
}
if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) {
ret = -EACCES;
goto err;
}
return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
err:
dput(dentry);
mntput(ipc_ns->mq_mnt);
return ERR_PTR(ret);
int acc;
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY))
return ERR_PTR(-EINVAL);
acc = oflag2acc[oflag & O_ACCMODE];
if (inode_permission(path->dentry->d_inode, acc))
return ERR_PTR(-EACCES);
return dentry_open(path, oflag, current_cred());
}
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
struct mq_attr __user *, u_attr)
{
struct dentry *dentry;
struct path path;
struct file *filp;
char *name;
struct mq_attr attr;
int fd, error;
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
struct dentry *root = ipc_ns->mq_mnt->mnt_root;
if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr)))
return -EFAULT;
@ -822,52 +802,49 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
if (fd < 0)
goto out_putname;
mutex_lock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name));
if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
error = 0;
mutex_lock(&root->d_inode->i_mutex);
path.dentry = lookup_one_len(name, root, strlen(name));
if (IS_ERR(path.dentry)) {
error = PTR_ERR(path.dentry);
goto out_putfd;
}
mntget(ipc_ns->mq_mnt);
path.mnt = mntget(ipc_ns->mq_mnt);
if (oflag & O_CREAT) {
if (dentry->d_inode) { /* entry already exists */
audit_inode(name, dentry);
if (path.dentry->d_inode) { /* entry already exists */
audit_inode(name, path.dentry);
if (oflag & O_EXCL) {
error = -EEXIST;
goto out;
}
filp = do_open(ipc_ns, dentry, oflag);
filp = do_open(&path, oflag);
} else {
filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root,
dentry, oflag, mode,
filp = do_create(ipc_ns, root->d_inode,
&path, oflag, mode,
u_attr ? &attr : NULL);
}
} else {
if (!dentry->d_inode) {
if (!path.dentry->d_inode) {
error = -ENOENT;
goto out;
}
audit_inode(name, dentry);
filp = do_open(ipc_ns, dentry, oflag);
audit_inode(name, path.dentry);
filp = do_open(&path, oflag);
}
if (IS_ERR(filp)) {
if (!IS_ERR(filp))
fd_install(fd, filp);
else
error = PTR_ERR(filp);
goto out_putfd;
}
fd_install(fd, filp);
goto out_upsem;
out:
dput(dentry);
mntput(ipc_ns->mq_mnt);
path_put(&path);
out_putfd:
put_unused_fd(fd);
fd = error;
out_upsem:
mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
if (error) {
put_unused_fd(fd);
fd = error;
}
mutex_unlock(&root->d_inode->i_mutex);
out_putname:
putname(name);
return fd;