328 lines
7.4 KiB
C
328 lines
7.4 KiB
C
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/*
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* linux/fs/ext3/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/mount.h>
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#include <linux/compat.h>
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#include <asm/uaccess.h>
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#include "ext3.h"
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long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file_inode(filp);
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struct ext3_inode_info *ei = EXT3_I(inode);
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unsigned int flags;
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unsigned short rsv_window_size;
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ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
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switch (cmd) {
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case EXT3_IOC_GETFLAGS:
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ext3_get_inode_flags(ei);
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flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
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return put_user(flags, (int __user *) arg);
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case EXT3_IOC_SETFLAGS: {
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handle_t *handle = NULL;
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int err;
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struct ext3_iloc iloc;
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unsigned int oldflags;
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unsigned int jflag;
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if (!inode_owner_or_capable(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_file(filp);
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if (err)
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return err;
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flags = ext3_mask_flags(inode->i_mode, flags);
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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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err = -EPERM;
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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 & EXT3_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) & (EXT3_APPEND_FL | EXT3_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) & (EXT3_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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handle = ext3_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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handle->h_sync = 1;
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err = ext3_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 & EXT3_FL_USER_MODIFIABLE;
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flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
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ei->i_flags = flags;
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ext3_set_inode_flags(inode);
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inode->i_ctime = CURRENT_TIME_SEC;
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err = ext3_mark_iloc_dirty(handle, inode, &iloc);
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flags_err:
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ext3_journal_stop(handle);
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if (err)
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goto flags_out;
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if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
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err = ext3_change_inode_journal_flag(inode, jflag);
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flags_out:
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mutex_unlock(&inode->i_mutex);
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mnt_drop_write_file(filp);
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return err;
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}
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case EXT3_IOC_GETVERSION:
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case EXT3_IOC_GETVERSION_OLD:
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return put_user(inode->i_generation, (int __user *) arg);
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case EXT3_IOC_SETVERSION:
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case EXT3_IOC_SETVERSION_OLD: {
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handle_t *handle;
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struct ext3_iloc iloc;
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__u32 generation;
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int err;
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if (!inode_owner_or_capable(inode))
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return -EPERM;
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err = mnt_want_write_file(filp);
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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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mutex_lock(&inode->i_mutex);
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handle = ext3_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 unlock_out;
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}
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err = ext3_reserve_inode_write(handle, inode, &iloc);
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if (err == 0) {
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inode->i_ctime = CURRENT_TIME_SEC;
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inode->i_generation = generation;
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err = ext3_mark_iloc_dirty(handle, inode, &iloc);
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}
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ext3_journal_stop(handle);
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unlock_out:
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mutex_unlock(&inode->i_mutex);
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setversion_out:
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mnt_drop_write_file(filp);
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return err;
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}
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case EXT3_IOC_GETRSVSZ:
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if (test_opt(inode->i_sb, RESERVATION)
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&& S_ISREG(inode->i_mode)
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&& ei->i_block_alloc_info) {
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rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
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return put_user(rsv_window_size, (int __user *)arg);
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}
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return -ENOTTY;
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case EXT3_IOC_SETRSVSZ: {
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int err;
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if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
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return -ENOTTY;
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err = mnt_want_write_file(filp);
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if (err)
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return err;
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if (!inode_owner_or_capable(inode)) {
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err = -EACCES;
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goto setrsvsz_out;
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}
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if (get_user(rsv_window_size, (int __user *)arg)) {
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err = -EFAULT;
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goto setrsvsz_out;
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}
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if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
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rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
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/*
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* need to allocate reservation structure for this inode
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* before set the window size
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*/
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mutex_lock(&ei->truncate_mutex);
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if (!ei->i_block_alloc_info)
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ext3_init_block_alloc_info(inode);
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if (ei->i_block_alloc_info){
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struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
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rsv->rsv_goal_size = rsv_window_size;
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}
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mutex_unlock(&ei->truncate_mutex);
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setrsvsz_out:
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mnt_drop_write_file(filp);
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return err;
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}
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case EXT3_IOC_GROUP_EXTEND: {
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ext3_fsblk_t n_blocks_count;
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struct super_block *sb = inode->i_sb;
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int err, err2;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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err = mnt_want_write_file(filp);
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if (err)
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return err;
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if (get_user(n_blocks_count, (__u32 __user *)arg)) {
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err = -EFAULT;
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goto group_extend_out;
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}
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err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
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journal_lock_updates(EXT3_SB(sb)->s_journal);
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err2 = journal_flush(EXT3_SB(sb)->s_journal);
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journal_unlock_updates(EXT3_SB(sb)->s_journal);
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if (err == 0)
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err = err2;
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group_extend_out:
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mnt_drop_write_file(filp);
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return err;
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}
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case EXT3_IOC_GROUP_ADD: {
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struct ext3_new_group_data input;
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struct super_block *sb = inode->i_sb;
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int err, err2;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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err = mnt_want_write_file(filp);
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if (err)
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return err;
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if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
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sizeof(input))) {
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err = -EFAULT;
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goto group_add_out;
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}
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err = ext3_group_add(sb, &input);
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journal_lock_updates(EXT3_SB(sb)->s_journal);
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err2 = journal_flush(EXT3_SB(sb)->s_journal);
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journal_unlock_updates(EXT3_SB(sb)->s_journal);
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if (err == 0)
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err = err2;
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group_add_out:
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mnt_drop_write_file(filp);
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return err;
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}
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case FITRIM: {
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struct super_block *sb = inode->i_sb;
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struct fstrim_range range;
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int ret = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (copy_from_user(&range, (struct fstrim_range __user *)arg,
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sizeof(range)))
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return -EFAULT;
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ret = ext3_trim_fs(sb, &range);
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if (ret < 0)
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return ret;
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if (copy_to_user((struct fstrim_range __user *)arg, &range,
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sizeof(range)))
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return -EFAULT;
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return 0;
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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 ext3_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 EXT3_IOC32_GETFLAGS:
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cmd = EXT3_IOC_GETFLAGS;
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break;
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case EXT3_IOC32_SETFLAGS:
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cmd = EXT3_IOC_SETFLAGS;
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break;
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case EXT3_IOC32_GETVERSION:
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cmd = EXT3_IOC_GETVERSION;
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break;
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case EXT3_IOC32_SETVERSION:
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cmd = EXT3_IOC_SETVERSION;
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break;
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case EXT3_IOC32_GROUP_EXTEND:
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cmd = EXT3_IOC_GROUP_EXTEND;
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break;
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case EXT3_IOC32_GETVERSION_OLD:
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cmd = EXT3_IOC_GETVERSION_OLD;
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break;
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case EXT3_IOC32_SETVERSION_OLD:
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cmd = EXT3_IOC_SETVERSION_OLD;
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break;
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#ifdef CONFIG_JBD_DEBUG
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case EXT3_IOC32_WAIT_FOR_READONLY:
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cmd = EXT3_IOC_WAIT_FOR_READONLY;
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break;
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#endif
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case EXT3_IOC32_GETRSVSZ:
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cmd = EXT3_IOC_GETRSVSZ;
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break;
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case EXT3_IOC32_SETRSVSZ:
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cmd = EXT3_IOC_SETRSVSZ;
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break;
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case EXT3_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 ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
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}
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#endif
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