Linux-2.6.12-rc2
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!
This commit is contained in:
Linus Torvalds
243
fs/ext3/ioctl.c
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243
fs/ext3/ioctl.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/fs.h>
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#include <linux/jbd.h>
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#include <linux/ext3_fs.h>
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#include <linux/ext3_jbd.h>
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#include <linux/time.h>
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#include <asm/uaccess.h>
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int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
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unsigned long arg)
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{
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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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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 (IS_RDONLY(inode))
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return -EROFS;
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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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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if (!S_ISDIR(inode->i_mode))
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flags &= ~EXT3_DIRSYNC_FL;
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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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return -EPERM;
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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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return -EPERM;
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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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return PTR_ERR(handle);
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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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return err;
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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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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 ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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return -EPERM;
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if (IS_RDONLY(inode))
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return -EROFS;
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if (get_user(generation, (int __user *) arg))
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return -EFAULT;
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handle = ext3_journal_start(inode, 1);
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if (IS_ERR(handle))
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return PTR_ERR(handle);
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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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return err;
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}
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#ifdef CONFIG_JBD_DEBUG
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case EXT3_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(&EXT3_SB(sb)->ro_wait_queue, &wait);
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if (timer_pending(&EXT3_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(&EXT3_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 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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if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
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return -ENOTTY;
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if (IS_RDONLY(inode))
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return -EROFS;
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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return -EACCES;
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if (get_user(rsv_window_size, (int __user *)arg))
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return -EFAULT;
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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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down(&ei->truncate_sem);
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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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up(&ei->truncate_sem);
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return 0;
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}
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case EXT3_IOC_GROUP_EXTEND: {
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unsigned long n_blocks_count;
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struct super_block *sb = inode->i_sb;
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int err;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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if (IS_RDONLY(inode))
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return -EROFS;
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if (get_user(n_blocks_count, (__u32 __user *)arg))
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return -EFAULT;
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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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journal_flush(EXT3_SB(sb)->s_journal);
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journal_unlock_updates(EXT3_SB(sb)->s_journal);
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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;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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if (IS_RDONLY(inode))
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return -EROFS;
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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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return -EFAULT;
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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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journal_flush(EXT3_SB(sb)->s_journal);
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journal_unlock_updates(EXT3_SB(sb)->s_journal);
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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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