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Subject[PATCH 16/17] pramfs: ioctl operations
From: Marco Stornelli <marco.stornelli@gmail.com>

Ioctl operations.

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
---
diff --git a/fs/pramfs/ioctl.c b/fs/pramfs/ioctl.c
new file mode 100644
index 0000000..092cbe6
--- /dev/null
+++ b/fs/pramfs/ioctl.c
@@ -0,0 +1,121 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Ioctl operations.
+ *
+ * Copyright 2010 Marco Stornelli <marco.stornelli@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/capability.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/compat.h>
+#include <linux/mount.h>
+#include "pram.h"
+
+long pram_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct pram_inode *pi;
+ unsigned int flags;
+ int ret;
+
+ pi = pram_get_inode(inode->i_sb, inode->i_ino);
+ if (!pi)
+ return -EACCES;
+
+ switch (cmd) {
+ case FS_IOC_GETFLAGS:
+ flags = be32_to_cpu(pi->i_flags) & FS_FL_USER_VISIBLE;
+ return put_user(flags, (int __user *) arg);
+ case FS_IOC_SETFLAGS: {
+ unsigned int oldflags;
+
+ ret = mnt_want_write(filp->f_path.mnt);
+ if (ret)
+ return ret;
+
+ if (!is_owner_or_cap(inode)) {
+ ret = -EACCES;
+ goto flags_out;
+ }
+
+ if (get_user(flags, (int __user *) arg)) {
+ ret = -EFAULT;
+ goto flags_out;
+ }
+
+ mutex_lock(&inode->i_mutex);
+ oldflags = be32_to_cpu(pi->i_flags);
+
+ if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ mutex_unlock(&inode->i_mutex);
+ ret = -EPERM;
+ goto flags_out;
+ }
+ }
+
+ if (!S_ISDIR(inode->i_mode))
+ flags &= ~FS_DIRSYNC_FL;
+
+ flags = flags & FS_FL_USER_MODIFIABLE;
+ flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
+ pram_memunlock_inode(inode->i_sb, pi);
+ pi->i_flags = cpu_to_be32(flags);
+ inode->i_ctime = CURRENT_TIME_SEC;
+ pi->i_ctime = cpu_to_be32(inode->i_ctime.tv_sec);
+ pram_set_inode_flags(inode, pi);
+ pram_memlock_inode(inode->i_sb, pi);
+ mutex_unlock(&inode->i_mutex);
+flags_out:
+ mnt_drop_write(filp->f_path.mnt);
+ return ret;
+ }
+ case FS_IOC_GETVERSION:
+ return put_user(inode->i_generation, (int __user *) arg);
+ case FS_IOC_SETVERSION:
+ if (!is_owner_or_cap(inode))
+ return -EPERM;
+ ret = mnt_want_write(filp->f_path.mnt);
+ if (ret)
+ return ret;
+ if (get_user(inode->i_generation, (int __user *) arg)) {
+ ret = -EFAULT;
+ } else {
+ inode->i_ctime = CURRENT_TIME_SEC;
+ pram_update_inode(inode);
+ }
+ mnt_drop_write(filp->f_path.mnt);
+ return ret;
+ default:
+ return -ENOTTY;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+long pram_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FS_IOC32_GETFLAGS:
+ cmd = FS_IOC_GETFLAGS;
+ break;
+ case FS_IOC32_SETFLAGS:
+ cmd = FS_IOC_SETFLAGS;
+ break;
+ case FS_IOC32_GETVERSION:
+ cmd = FS_IOC_GETVERSION;
+ break;
+ case FS_IOC32_SETVERSION:
+ cmd = FS_IOC_SETVERSION;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return pram_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif

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