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authorAl Viro <viro@zeniv.linux.org.uk>2012-06-26 21:58:53 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-23 00:01:29 +0400
commit765927b2d508712d320c8934db963bbe14c3fcec (patch)
tree97acdb14fae285764def396c4ed01d4d5c93e76a /ipc
parentbf349a447059656ebe63fb4fd1ccb27ac1da22ad (diff)
downloadlinux-765927b2d508712d320c8934db963bbe14c3fcec.tar.gz
switch dentry_open() to struct path, make it grab references itself
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/mqueue.c117
1 files changed, 47 insertions, 70 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 2dee38d53c7..f8e54f5b908 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -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;