374 lines
8.5 KiB
C
374 lines
8.5 KiB
C
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/*
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* linux/fs/ext4/ioctl.c
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*
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* Copyright (C) 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*/
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#include <linux/fs.h>
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#include <linux/jbd2.h>
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#include <linux/capability.h>
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#include <linux/time.h>
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/file.h>
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#include <asm/uaccess.h>
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#include "ext4_jbd2.h"
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#include "ext4.h"
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long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct ext4_inode_info *ei = EXT4_I(inode);
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unsigned int flags;
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ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
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switch (cmd) {
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case EXT4_IOC_GETFLAGS:
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ext4_get_inode_flags(ei);
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flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
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return put_user(flags, (int __user *) arg);
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case EXT4_IOC_SETFLAGS: {
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handle_t *handle = NULL;
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int err, migrate = 0;
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struct ext4_iloc iloc;
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unsigned int oldflags;
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unsigned int jflag;
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if (!is_owner_or_cap(inode))
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return -EACCES;
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if (get_user(flags, (int __user *) arg))
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return -EFAULT;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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flags = ext4_mask_flags(inode->i_mode, flags);
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err = -EPERM;
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mutex_lock(&inode->i_mutex);
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/* Is it quota file? Do not allow user to mess with it */
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if (IS_NOQUOTA(inode))
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goto flags_out;
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oldflags = ei->i_flags;
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/* The JOURNAL_DATA flag is modifiable only by root */
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jflag = flags & EXT4_JOURNAL_DATA_FL;
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/*
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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* the relevant capability.
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*
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* This test looks nicer. Thanks to Pauline Middelink
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*/
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if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
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if (!capable(CAP_LINUX_IMMUTABLE))
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goto flags_out;
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}
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/*
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* The JOURNAL_DATA flag can only be changed by
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* the relevant capability.
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*/
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if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
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if (!capable(CAP_SYS_RESOURCE))
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goto flags_out;
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}
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if (oldflags & EXT4_EXTENTS_FL) {
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/* We don't support clearning extent flags */
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if (!(flags & EXT4_EXTENTS_FL)) {
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err = -EOPNOTSUPP;
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goto flags_out;
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}
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} else if (flags & EXT4_EXTENTS_FL) {
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/* migrate the file */
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migrate = 1;
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flags &= ~EXT4_EXTENTS_FL;
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}
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handle = ext4_journal_start(inode, 1);
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if (IS_ERR(handle)) {
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err = PTR_ERR(handle);
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goto flags_out;
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}
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if (IS_SYNC(inode))
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ext4_handle_sync(handle);
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err = ext4_reserve_inode_write(handle, inode, &iloc);
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if (err)
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goto flags_err;
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flags = flags & EXT4_FL_USER_MODIFIABLE;
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flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
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ei->i_flags = flags;
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ext4_set_inode_flags(inode);
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inode->i_ctime = ext4_current_time(inode);
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err = ext4_mark_iloc_dirty(handle, inode, &iloc);
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flags_err:
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ext4_journal_stop(handle);
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if (err)
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goto flags_out;
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if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
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err = ext4_change_inode_journal_flag(inode, jflag);
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if (err)
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goto flags_out;
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if (migrate)
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err = ext4_ext_migrate(inode);
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flags_out:
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mutex_unlock(&inode->i_mutex);
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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case EXT4_IOC_GETVERSION:
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case EXT4_IOC_GETVERSION_OLD:
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return put_user(inode->i_generation, (int __user *) arg);
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case EXT4_IOC_SETVERSION:
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case EXT4_IOC_SETVERSION_OLD: {
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handle_t *handle;
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struct ext4_iloc iloc;
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__u32 generation;
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int err;
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if (!is_owner_or_cap(inode))
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return -EPERM;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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if (get_user(generation, (int __user *) arg)) {
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err = -EFAULT;
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goto setversion_out;
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}
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handle = ext4_journal_start(inode, 1);
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if (IS_ERR(handle)) {
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err = PTR_ERR(handle);
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goto setversion_out;
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}
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err = ext4_reserve_inode_write(handle, inode, &iloc);
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if (err == 0) {
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inode->i_ctime = ext4_current_time(inode);
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inode->i_generation = generation;
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err = ext4_mark_iloc_dirty(handle, inode, &iloc);
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}
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ext4_journal_stop(handle);
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setversion_out:
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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#ifdef CONFIG_JBD2_DEBUG
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case EXT4_IOC_WAIT_FOR_READONLY:
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/*
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* This is racy - by the time we're woken up and running,
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* the superblock could be released. And the module could
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* have been unloaded. So sue me.
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*
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* Returns 1 if it slept, else zero.
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*/
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{
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struct super_block *sb = inode->i_sb;
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DECLARE_WAITQUEUE(wait, current);
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int ret = 0;
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
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if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
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schedule();
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ret = 1;
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}
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remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
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return ret;
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}
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#endif
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case EXT4_IOC_GROUP_EXTEND: {
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ext4_fsblk_t n_blocks_count;
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struct super_block *sb = inode->i_sb;
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int err, err2=0;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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if (get_user(n_blocks_count, (__u32 __user *)arg))
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return -EFAULT;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
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if (EXT4_SB(sb)->s_journal) {
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jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
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err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
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jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
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}
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if (err == 0)
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err = err2;
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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case EXT4_IOC_MOVE_EXT: {
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struct move_extent me;
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struct file *donor_filp;
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int err;
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if (!(filp->f_mode & FMODE_READ) ||
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!(filp->f_mode & FMODE_WRITE))
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return -EBADF;
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if (copy_from_user(&me,
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(struct move_extent __user *)arg, sizeof(me)))
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return -EFAULT;
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me.moved_len = 0;
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donor_filp = fget(me.donor_fd);
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if (!donor_filp)
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return -EBADF;
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if (!(donor_filp->f_mode & FMODE_WRITE)) {
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err = -EBADF;
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goto mext_out;
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}
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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goto mext_out;
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err = ext4_move_extents(filp, donor_filp, me.orig_start,
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me.donor_start, me.len, &me.moved_len);
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mnt_drop_write(filp->f_path.mnt);
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if (me.moved_len > 0)
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file_remove_suid(donor_filp);
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if (copy_to_user((struct move_extent *)arg, &me, sizeof(me)))
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err = -EFAULT;
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mext_out:
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fput(donor_filp);
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return err;
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}
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case EXT4_IOC_GROUP_ADD: {
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struct ext4_new_group_data input;
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struct super_block *sb = inode->i_sb;
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int err, err2=0;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
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sizeof(input)))
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return -EFAULT;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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err = ext4_group_add(sb, &input);
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if (EXT4_SB(sb)->s_journal) {
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jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
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err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
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jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
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}
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if (err == 0)
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err = err2;
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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case EXT4_IOC_MIGRATE:
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{
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int err;
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if (!is_owner_or_cap(inode))
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return -EACCES;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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/*
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* inode_mutex prevent write and truncate on the file.
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* Read still goes through. We take i_data_sem in
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* ext4_ext_swap_inode_data before we switch the
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* inode format to prevent read.
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*/
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mutex_lock(&(inode->i_mutex));
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err = ext4_ext_migrate(inode);
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mutex_unlock(&(inode->i_mutex));
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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case EXT4_IOC_ALLOC_DA_BLKS:
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{
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int err;
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if (!is_owner_or_cap(inode))
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return -EACCES;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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err = ext4_alloc_da_blocks(inode);
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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default:
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return -ENOTTY;
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}
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}
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#ifdef CONFIG_COMPAT
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long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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/* These are just misnamed, they actually get/put from/to user an int */
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switch (cmd) {
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case EXT4_IOC32_GETFLAGS:
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cmd = EXT4_IOC_GETFLAGS;
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break;
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case EXT4_IOC32_SETFLAGS:
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cmd = EXT4_IOC_SETFLAGS;
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break;
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case EXT4_IOC32_GETVERSION:
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cmd = EXT4_IOC_GETVERSION;
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break;
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case EXT4_IOC32_SETVERSION:
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cmd = EXT4_IOC_SETVERSION;
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break;
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case EXT4_IOC32_GROUP_EXTEND:
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cmd = EXT4_IOC_GROUP_EXTEND;
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break;
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case EXT4_IOC32_GETVERSION_OLD:
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cmd = EXT4_IOC_GETVERSION_OLD;
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break;
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case EXT4_IOC32_SETVERSION_OLD:
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cmd = EXT4_IOC_SETVERSION_OLD;
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break;
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#ifdef CONFIG_JBD2_DEBUG
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case EXT4_IOC32_WAIT_FOR_READONLY:
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cmd = EXT4_IOC_WAIT_FOR_READONLY;
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break;
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#endif
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case EXT4_IOC32_GETRSVSZ:
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cmd = EXT4_IOC_GETRSVSZ;
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break;
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case EXT4_IOC32_SETRSVSZ:
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cmd = EXT4_IOC_SETRSVSZ;
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break;
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case EXT4_IOC_GROUP_ADD:
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
|
||
|
|
}
|
||
|
|
#endif
|