![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
244 lines
5.8 KiB
C
244 lines
5.8 KiB
C
/*
|
|
* linux/fs/ext3/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/jbd.h>
|
|
#include <linux/ext3_fs.h>
|
|
#include <linux/ext3_jbd.h>
|
|
#include <linux/time.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
|
|
int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct ext3_inode_info *ei = EXT3_I(inode);
|
|
unsigned int flags;
|
|
unsigned short rsv_window_size;
|
|
|
|
ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
|
|
|
|
switch (cmd) {
|
|
case EXT3_IOC_GETFLAGS:
|
|
flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
|
|
return put_user(flags, (int __user *) arg);
|
|
case EXT3_IOC_SETFLAGS: {
|
|
handle_t *handle = NULL;
|
|
int err;
|
|
struct ext3_iloc iloc;
|
|
unsigned int oldflags;
|
|
unsigned int jflag;
|
|
|
|
if (IS_RDONLY(inode))
|
|
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 &= ~EXT3_DIRSYNC_FL;
|
|
|
|
oldflags = ei->i_flags;
|
|
|
|
/* The JOURNAL_DATA flag is modifiable only by root */
|
|
jflag = flags & EXT3_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 ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
|
|
if (!capable(CAP_LINUX_IMMUTABLE))
|
|
return -EPERM;
|
|
}
|
|
|
|
/*
|
|
* The JOURNAL_DATA flag can only be changed by
|
|
* the relevant capability.
|
|
*/
|
|
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
}
|
|
|
|
|
|
handle = ext3_journal_start(inode, 1);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
if (IS_SYNC(inode))
|
|
handle->h_sync = 1;
|
|
err = ext3_reserve_inode_write(handle, inode, &iloc);
|
|
if (err)
|
|
goto flags_err;
|
|
|
|
flags = flags & EXT3_FL_USER_MODIFIABLE;
|
|
flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
|
|
ei->i_flags = flags;
|
|
|
|
ext3_set_inode_flags(inode);
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
|
|
err = ext3_mark_iloc_dirty(handle, inode, &iloc);
|
|
flags_err:
|
|
ext3_journal_stop(handle);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
|
|
err = ext3_change_inode_journal_flag(inode, jflag);
|
|
return err;
|
|
}
|
|
case EXT3_IOC_GETVERSION:
|
|
case EXT3_IOC_GETVERSION_OLD:
|
|
return put_user(inode->i_generation, (int __user *) arg);
|
|
case EXT3_IOC_SETVERSION:
|
|
case EXT3_IOC_SETVERSION_OLD: {
|
|
handle_t *handle;
|
|
struct ext3_iloc iloc;
|
|
__u32 generation;
|
|
int err;
|
|
|
|
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
|
|
return -EPERM;
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
if (get_user(generation, (int __user *) arg))
|
|
return -EFAULT;
|
|
|
|
handle = ext3_journal_start(inode, 1);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
err = ext3_reserve_inode_write(handle, inode, &iloc);
|
|
if (err == 0) {
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
inode->i_generation = generation;
|
|
err = ext3_mark_iloc_dirty(handle, inode, &iloc);
|
|
}
|
|
ext3_journal_stop(handle);
|
|
return err;
|
|
}
|
|
#ifdef CONFIG_JBD_DEBUG
|
|
case EXT3_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(&EXT3_SB(sb)->ro_wait_queue, &wait);
|
|
if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
|
|
schedule();
|
|
ret = 1;
|
|
}
|
|
remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
|
|
return ret;
|
|
}
|
|
#endif
|
|
case EXT3_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 EXT3_IOC_SETRSVSZ: {
|
|
|
|
if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
|
|
return -ENOTTY;
|
|
|
|
if (IS_RDONLY(inode))
|
|
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 > EXT3_MAX_RESERVE_BLOCKS)
|
|
rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
|
|
|
|
/*
|
|
* need to allocate reservation structure for this inode
|
|
* before set the window size
|
|
*/
|
|
down(&ei->truncate_sem);
|
|
if (!ei->i_block_alloc_info)
|
|
ext3_init_block_alloc_info(inode);
|
|
|
|
if (ei->i_block_alloc_info){
|
|
struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
|
|
rsv->rsv_goal_size = rsv_window_size;
|
|
}
|
|
up(&ei->truncate_sem);
|
|
return 0;
|
|
}
|
|
case EXT3_IOC_GROUP_EXTEND: {
|
|
unsigned long n_blocks_count;
|
|
struct super_block *sb = inode->i_sb;
|
|
int err;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
|
|
if (get_user(n_blocks_count, (__u32 __user *)arg))
|
|
return -EFAULT;
|
|
|
|
err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
|
|
journal_lock_updates(EXT3_SB(sb)->s_journal);
|
|
journal_flush(EXT3_SB(sb)->s_journal);
|
|
journal_unlock_updates(EXT3_SB(sb)->s_journal);
|
|
|
|
return err;
|
|
}
|
|
case EXT3_IOC_GROUP_ADD: {
|
|
struct ext3_new_group_data input;
|
|
struct super_block *sb = inode->i_sb;
|
|
int err;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
|
|
if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
|
|
sizeof(input)))
|
|
return -EFAULT;
|
|
|
|
err = ext3_group_add(sb, &input);
|
|
journal_lock_updates(EXT3_SB(sb)->s_journal);
|
|
journal_flush(EXT3_SB(sb)->s_journal);
|
|
journal_unlock_updates(EXT3_SB(sb)->s_journal);
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|