Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / ext2 / ioctl.c

diff --git a/kernel/fs/ext2/ioctl.c b/kernel/fs/ext2/ioctl.c
new file mode 100644 (file)
index 0000000..5d46c09
--- /dev/null
+++ b/kernel/fs/ext2/ioctl.c
@@ -0,0 +1,188 @@
+/*
+ * linux/fs/ext2/ioctl.c
+ *
+ * Copyright (C) 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ */
+
+#include "ext2.h"
+#include <linux/capability.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/compat.h>
+#include <linux/mount.h>
+#include <asm/current.h>
+#include <asm/uaccess.h>
+
+
+long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+       struct inode *inode = file_inode(filp);
+       struct ext2_inode_info *ei = EXT2_I(inode);
+       unsigned int flags;
+       unsigned short rsv_window_size;
+       int ret;
+
+       ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
+
+       switch (cmd) {
+       case EXT2_IOC_GETFLAGS:
+               ext2_get_inode_flags(ei);
+               flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
+               return put_user(flags, (int __user *) arg);
+       case EXT2_IOC_SETFLAGS: {
+               unsigned int oldflags;
+
+               ret = mnt_want_write_file(filp);
+               if (ret)
+                       return ret;
+
+               if (!inode_owner_or_capable(inode)) {
+                       ret = -EACCES;
+                       goto setflags_out;
+               }
+
+               if (get_user(flags, (int __user *) arg)) {
+                       ret = -EFAULT;
+                       goto setflags_out;
+               }
+
+               flags = ext2_mask_flags(inode->i_mode, flags);
+
+               mutex_lock(&inode->i_mutex);
+               /* Is it quota file? Do not allow user to mess with it */
+               if (IS_NOQUOTA(inode)) {
+                       mutex_unlock(&inode->i_mutex);
+                       ret = -EPERM;
+                       goto setflags_out;
+               }
+               oldflags = ei->i_flags;
+
+               /*
+                * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+                * the relevant capability.
+                *
+                * This test looks nicer. Thanks to Pauline Middelink
+                */
+               if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
+                       if (!capable(CAP_LINUX_IMMUTABLE)) {
+                               mutex_unlock(&inode->i_mutex);
+                               ret = -EPERM;
+                               goto setflags_out;
+                       }
+               }
+
+               flags = flags & EXT2_FL_USER_MODIFIABLE;
+               flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
+               ei->i_flags = flags;
+
+               ext2_set_inode_flags(inode);
+               inode->i_ctime = CURRENT_TIME_SEC;
+               mutex_unlock(&inode->i_mutex);
+
+               mark_inode_dirty(inode);
+setflags_out:
+               mnt_drop_write_file(filp);
+               return ret;
+       }
+       case EXT2_IOC_GETVERSION:
+               return put_user(inode->i_generation, (int __user *) arg);
+       case EXT2_IOC_SETVERSION: {
+               __u32 generation;
+
+               if (!inode_owner_or_capable(inode))
+                       return -EPERM;
+               ret = mnt_want_write_file(filp);
+               if (ret)
+                       return ret;
+               if (get_user(generation, (int __user *) arg)) {
+                       ret = -EFAULT;
+                       goto setversion_out;
+               }
+
+               mutex_lock(&inode->i_mutex);
+               inode->i_ctime = CURRENT_TIME_SEC;
+               inode->i_generation = generation;
+               mutex_unlock(&inode->i_mutex);
+
+               mark_inode_dirty(inode);
+setversion_out:
+               mnt_drop_write_file(filp);
+               return ret;
+       }
+       case EXT2_IOC_GETRSVSZ:
+               if (test_opt(inode->i_sb, RESERVATION)
+                       && S_ISREG(inode->i_mode)
+                       && ei->i_block_alloc_info) {
+                       rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
+                       return put_user(rsv_window_size, (int __user *)arg);
+               }
+               return -ENOTTY;
+       case EXT2_IOC_SETRSVSZ: {
+
+               if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+                       return -ENOTTY;
+
+               if (!inode_owner_or_capable(inode))
+                       return -EACCES;
+
+               if (get_user(rsv_window_size, (int __user *)arg))
+                       return -EFAULT;
+
+               ret = mnt_want_write_file(filp);
+               if (ret)
+                       return ret;
+
+               if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
+                       rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
+
+               /*
+                * need to allocate reservation structure for this inode
+                * before set the window size
+                */
+               /*
+                * XXX What lock should protect the rsv_goal_size?
+                * Accessed in ext2_get_block only.  ext3 uses i_truncate.
+                */
+               mutex_lock(&ei->truncate_mutex);
+               if (!ei->i_block_alloc_info)
+                       ext2_init_block_alloc_info(inode);
+
+               if (ei->i_block_alloc_info){
+                       struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
+                       rsv->rsv_goal_size = rsv_window_size;
+               }
+               mutex_unlock(&ei->truncate_mutex);
+               mnt_drop_write_file(filp);
+               return 0;
+       }
+       default:
+               return -ENOTTY;
+       }
+}
+
+#ifdef CONFIG_COMPAT
+long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+       /* These are just misnamed, they actually get/put from/to user an int */
+       switch (cmd) {
+       case EXT2_IOC32_GETFLAGS:
+               cmd = EXT2_IOC_GETFLAGS;
+               break;
+       case EXT2_IOC32_SETFLAGS:
+               cmd = EXT2_IOC_SETFLAGS;
+               break;
+       case EXT2_IOC32_GETVERSION:
+               cmd = EXT2_IOC_GETVERSION;
+               break;
+       case EXT2_IOC32_SETVERSION:
+               cmd = EXT2_IOC_SETVERSION;
+               break;
+       default:
+               return -ENOIOCTLCMD;
+       }
+       return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif