/*
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/*
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* linux/fs/ext2/ioctl.c
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* linux/fs/ext2/ioctl.c
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*
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*
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* Copyright (C) 1993, 1994, 1995
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* Copyright (C) 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* Universite Pierre et Marie Curie (Paris VI)
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*/
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*/
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/ioctl.h>
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#include <linux/ioctl.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
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int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
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unsigned long arg)
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unsigned long arg)
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{
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{
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int err;
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int err;
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unsigned long flags;
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unsigned long flags;
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ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
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ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
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switch (cmd) {
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switch (cmd) {
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case EXT2_IOC_GETFLAGS:
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case EXT2_IOC_GETFLAGS:
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err = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
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err = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
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if (err)
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if (err)
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return err;
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return err;
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put_user(inode->u.ext2_i.i_flags, (int *) arg);
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put_user(inode->u.ext2_i.i_flags, (int *) arg);
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return 0;
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return 0;
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case EXT2_IOC_SETFLAGS:
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case EXT2_IOC_SETFLAGS:
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err = verify_area(VERIFY_READ, (int *) arg, sizeof(int));
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err = verify_area(VERIFY_READ, (int *) arg, sizeof(int));
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if (err)
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if (err)
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return err;
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return err;
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flags = get_user((int *) arg);
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flags = get_user((int *) arg);
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/*
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/*
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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* the super user when the security level is zero.
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* the super user when the security level is zero.
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*/
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*/
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if ((flags & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) ^
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if ((flags & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) ^
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(inode->u.ext2_i.i_flags &
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(inode->u.ext2_i.i_flags &
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(EXT2_APPEND_FL | EXT2_IMMUTABLE_FL))) {
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(EXT2_APPEND_FL | EXT2_IMMUTABLE_FL))) {
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/* This test looks nicer. Thanks to Pauline Middelink */
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/* This test looks nicer. Thanks to Pauline Middelink */
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if (!fsuser() || securelevel > 0)
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if (!fsuser() || securelevel > 0)
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return -EPERM;
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return -EPERM;
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} else
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} else
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if ((current->fsuid != inode->i_uid) && !fsuser())
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if ((current->fsuid != inode->i_uid) && !fsuser())
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return -EPERM;
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return -EPERM;
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if (IS_RDONLY(inode))
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if (IS_RDONLY(inode))
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return -EROFS;
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return -EROFS;
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inode->u.ext2_i.i_flags = flags;
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inode->u.ext2_i.i_flags = flags;
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if (flags & EXT2_APPEND_FL)
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if (flags & EXT2_APPEND_FL)
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inode->i_flags |= S_APPEND;
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inode->i_flags |= S_APPEND;
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else
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else
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inode->i_flags &= ~S_APPEND;
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inode->i_flags &= ~S_APPEND;
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if (flags & EXT2_IMMUTABLE_FL)
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if (flags & EXT2_IMMUTABLE_FL)
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inode->i_flags |= S_IMMUTABLE;
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inode->i_flags |= S_IMMUTABLE;
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else
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else
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inode->i_flags &= ~S_IMMUTABLE;
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inode->i_flags &= ~S_IMMUTABLE;
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if (flags & EXT2_NOATIME_FL)
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if (flags & EXT2_NOATIME_FL)
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inode->i_flags |= MS_NOATIME;
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inode->i_flags |= MS_NOATIME;
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else
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else
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inode->i_flags &= ~MS_NOATIME;
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inode->i_flags &= ~MS_NOATIME;
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inode->i_ctime = CURRENT_TIME;
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inode->i_ctime = CURRENT_TIME;
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inode->i_dirt = 1;
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inode->i_dirt = 1;
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return 0;
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return 0;
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case EXT2_IOC_GETVERSION:
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case EXT2_IOC_GETVERSION:
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err = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
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err = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
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if (err)
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if (err)
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return err;
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return err;
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put_user(inode->u.ext2_i.i_version, (int *) arg);
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put_user(inode->u.ext2_i.i_version, (int *) arg);
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return 0;
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return 0;
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case EXT2_IOC_SETVERSION:
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case EXT2_IOC_SETVERSION:
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if ((current->fsuid != inode->i_uid) && !fsuser())
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if ((current->fsuid != inode->i_uid) && !fsuser())
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return -EPERM;
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return -EPERM;
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if (IS_RDONLY(inode))
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if (IS_RDONLY(inode))
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return -EROFS;
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return -EROFS;
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err = verify_area(VERIFY_READ, (int *) arg, sizeof(int));
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err = verify_area(VERIFY_READ, (int *) arg, sizeof(int));
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if (err)
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if (err)
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return err;
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return err;
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inode->u.ext2_i.i_version = get_user((int *) arg);
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inode->u.ext2_i.i_version = get_user((int *) arg);
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inode->i_ctime = CURRENT_TIME;
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inode->i_ctime = CURRENT_TIME;
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inode->i_dirt = 1;
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inode->i_dirt = 1;
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return 0;
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return 0;
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default:
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default:
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return -ENOTTY;
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return -ENOTTY;
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}
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}
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}
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}
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