--- /dev/null
+/*
+ * linux/fs/ext4/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 <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/jbd2.h>
+#include <linux/capability.h>
+#include <linux/ext4_fs.h>
+#include <linux/ext4_jbd2.h>
+#include <linux/time.h>
+#include <linux/compat.h>
+#include <linux/smp_lock.h>
+#include <linux/vs_tag.h>
+#include <asm/uaccess.h>
+
+int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ unsigned int flags;
+ unsigned short rsv_window_size;
+
+ ext4_debug ("cmd = %u, arg = %lu\n", cmd, arg);
+
+ switch (cmd) {
+ case EXT4_IOC_GETFLAGS:
+ flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
+ return put_user(flags, (int __user *) arg);
+ case EXT4_IOC_SETFLAGS: {
+ handle_t *handle = NULL;
+ int err;
+ struct ext4_iloc iloc;
+ unsigned int oldflags;
+ unsigned int jflag;
+
+ if (IS_RDONLY(inode) ||
+ (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
+ return -EROFS;
+
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EACCES;
+
+ if (get_user(flags, (int __user *) arg))
+ return -EFAULT;
+
+ if (!S_ISDIR(inode->i_mode))
+ flags &= ~EXT4_DIRSYNC_FL;
+
+ mutex_lock(&inode->i_mutex);
+ oldflags = ei->i_flags;
+
+ /* The JOURNAL_DATA flag is modifiable only by root */
+ jflag = flags & EXT4_JOURNAL_DATA_FL;
+
+ /*
+ * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+ * the relevant capability.
+ *
+ * This test looks nicer. Thanks to Pauline Middelink
+ */
+ if ((oldflags & EXT4_IMMUTABLE_FL) ||
+ ((flags ^ oldflags) & (EXT4_APPEND_FL |
+ EXT4_IMMUTABLE_FL | EXT4_IUNLINK_FL))) {
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ mutex_unlock(&inode->i_mutex);
+ return -EPERM;
+ }
+ }
+
+ /*
+ * The JOURNAL_DATA flag can only be changed by
+ * the relevant capability.
+ */
+ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
+ if (!capable(CAP_SYS_RESOURCE)) {
+ mutex_unlock(&inode->i_mutex);
+ return -EPERM;
+ }
+ }
+
+
+ handle = ext4_journal_start(inode, 1);
+ if (IS_ERR(handle)) {
+ mutex_unlock(&inode->i_mutex);
+ return PTR_ERR(handle);
+ }
+ if (IS_SYNC(inode))
+ handle->h_sync = 1;
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (err)
+ goto flags_err;
+
+ flags = flags & EXT4_FL_USER_MODIFIABLE;
+ flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
+ ei->i_flags = flags;
+
+ ext4_set_inode_flags(inode);
+ inode->i_ctime = CURRENT_TIME_SEC;
+
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+flags_err:
+ ext4_journal_stop(handle);
+ if (err) {
+ mutex_unlock(&inode->i_mutex);
+ return err;
+ }
+
+ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
+ err = ext4_change_inode_journal_flag(inode, jflag);
+ mutex_unlock(&inode->i_mutex);
+ return err;
+ }
+ case EXT4_IOC_GETVERSION:
+ case EXT4_IOC_GETVERSION_OLD:
+ return put_user(inode->i_generation, (int __user *) arg);
+ case EXT4_IOC_SETVERSION:
+ case EXT4_IOC_SETVERSION_OLD: {
+ handle_t *handle;
+ struct ext4_iloc iloc;
+ __u32 generation;
+ int err;
+
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EPERM;
+ if (IS_RDONLY(inode) ||
+ (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
+ return -EROFS;
+ if (get_user(generation, (int __user *) arg))
+ return -EFAULT;
+
+ handle = ext4_journal_start(inode, 1);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (err == 0) {
+ inode->i_ctime = CURRENT_TIME_SEC;
+ inode->i_generation = generation;
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+ }
+ ext4_journal_stop(handle);
+ return err;
+ }
+#ifdef CONFIG_JBD_DEBUG
+ case EXT4_IOC_WAIT_FOR_READONLY:
+ /*
+ * This is racy - by the time we're woken up and running,
+ * the superblock could be released. And the module could
+ * have been unloaded. So sue me.
+ *
+ * Returns 1 if it slept, else zero.
+ */
+ {
+ struct super_block *sb = inode->i_sb;
+ DECLARE_WAITQUEUE(wait, current);
+ int ret = 0;
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
+ if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
+ schedule();
+ ret = 1;
+ }
+ remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
+ return ret;
+ }
+#endif
+ case EXT4_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 EXT4_IOC_SETRSVSZ: {
+
+ if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+ return -ENOTTY;
+
+ if (IS_RDONLY(inode) ||
+ (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
+ return -EROFS;
+
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EACCES;
+
+ if (get_user(rsv_window_size, (int __user *)arg))
+ return -EFAULT;
+
+ if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS)
+ rsv_window_size = EXT4_MAX_RESERVE_BLOCKS;
+
+ /*
+ * need to allocate reservation structure for this inode
+ * before set the window size
+ */
+ mutex_lock(&ei->truncate_mutex);
+ if (!ei->i_block_alloc_info)
+ ext4_init_block_alloc_info(inode);
+
+ if (ei->i_block_alloc_info){
+ struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
+ rsv->rsv_goal_size = rsv_window_size;
+ }
+ mutex_unlock(&ei->truncate_mutex);
+ return 0;
+ }
+ case EXT4_IOC_GROUP_EXTEND: {
+ ext4_fsblk_t n_blocks_count;
+ struct super_block *sb = inode->i_sb;
+ int err;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ if (IS_RDONLY(inode) ||
+ (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
+ return -EROFS;
+
+ if (get_user(n_blocks_count, (__u32 __user *)arg))
+ return -EFAULT;
+
+ err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
+ jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+ jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+
+ return err;
+ }
+ case EXT4_IOC_GROUP_ADD: {
+ struct ext4_new_group_data input;
+ struct super_block *sb = inode->i_sb;
+ int err;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ if (IS_RDONLY(inode) ||
+ (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
+ return -EROFS;
+
+ if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
+ sizeof(input)))
+ return -EFAULT;
+
+ err = ext4_group_add(sb, &input);
+ jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+ jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+
+ return err;
+ }
+
+#if defined(CONFIG_VSERVER_LEGACY) && !defined(CONFIG_TAGGING_NONE)
+ case EXT4_IOC_SETTAG: {
+ handle_t *handle;
+ struct ext4_iloc iloc;
+ int tag;
+ int err;
+
+ /* fixme: if stealth, return -ENOTTY */
+ if (!capable(CAP_CONTEXT))
+ return -EPERM;
+ if (IS_RDONLY(inode))
+ return -EROFS;
+ if (!(inode->i_sb->s_flags & MS_TAGGED))
+ return -ENOSYS;
+ if (get_user(tag, (int __user *) arg))
+ return -EFAULT;
+
+ handle = ext4_journal_start(inode, 1);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (err)
+ return err;
+
+ inode->i_tag = (tag & 0xFFFF);
+ inode->i_ctime = CURRENT_TIME;
+
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+ ext4_journal_stop(handle);
+ return err;
+ }
+#endif
+
+ default:
+ return -ENOTTY;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ int ret;
+
+ /* These are just misnamed, they actually get/put from/to user an int */
+ switch (cmd) {
+ case EXT4_IOC32_GETFLAGS:
+ cmd = EXT4_IOC_GETFLAGS;
+ break;
+ case EXT4_IOC32_SETFLAGS:
+ cmd = EXT4_IOC_SETFLAGS;
+ break;
+ case EXT4_IOC32_GETVERSION:
+ cmd = EXT4_IOC_GETVERSION;
+ break;
+ case EXT4_IOC32_SETVERSION:
+ cmd = EXT4_IOC_SETVERSION;
+ break;
+ case EXT4_IOC32_GROUP_EXTEND:
+ cmd = EXT4_IOC_GROUP_EXTEND;
+ break;
+ case EXT4_IOC32_GETVERSION_OLD:
+ cmd = EXT4_IOC_GETVERSION_OLD;
+ break;
+ case EXT4_IOC32_SETVERSION_OLD:
+ cmd = EXT4_IOC_SETVERSION_OLD;
+ break;
+#ifdef CONFIG_JBD_DEBUG
+ case EXT4_IOC32_WAIT_FOR_READONLY:
+ cmd = EXT4_IOC_WAIT_FOR_READONLY;
+ break;
+#endif
+ case EXT4_IOC32_GETRSVSZ:
+ cmd = EXT4_IOC_GETRSVSZ;
+ break;
+ case EXT4_IOC32_SETRSVSZ:
+ cmd = EXT4_IOC_SETRSVSZ;
+ break;
+ case EXT4_IOC_GROUP_ADD:
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ lock_kernel();
+ ret = ext4_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
+ unlock_kernel();
+ return ret;
+}
+#endif
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