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/*

 * 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/sched.h>

#include <asm/uaccess.h>

int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,

                unsigned long arg)

{

        unsigned int flags;

        ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);

        switch (cmd) {

        case EXT3_IOC_GETFLAGS:

                flags = inode->u.ext3_i.i_flags & EXT3_FL_USER_VISIBLE;

                return put_user(flags, (int *) 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 *) arg))

                        return -EFAULT;

                oldflags = inode->u.ext3_i.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;

                inode->u.ext3_i.i_flags = flags;

                ext3_set_inode_flags(inode);

                inode->i_ctime = CURRENT_TIME;

                err = ext3_mark_iloc_dirty(handle, inode, &iloc);

flags_err:

                ext3_journal_stop(handle, inode);

                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 *) 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 *) 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)

                        return err;

                inode->i_ctime = CURRENT_TIME;

                inode->i_generation = generation;

                err = ext3_mark_iloc_dirty(handle, inode, &iloc);

                ext3_journal_stop(handle, inode);

                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(&sb->u.ext3_sb.ro_wait_queue, &wait);

                        if (timer_pending(&sb->u.ext3_sb.turn_ro_timer)) {

                                schedule();

                                ret = 1;

                        }

                        remove_wait_queue(&sb->u.ext3_sb.ro_wait_queue, &wait);

                        return ret;

                }

#endif

        default:

                return -ENOTTY;

        }

}