ioctl.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /*
- * linux/fs/ext2/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/ext2_fs.h>
- #include <linux/sched.h>
- #include <asm/uaccess.h>
- int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
- unsigned long arg)
- {
- unsigned int flags;
- ext2_debug ("cmd = %u, arg = %lun", cmd, arg);
- switch (cmd) {
- case EXT2_IOC_GETFLAGS:
- flags = inode->u.ext2_i.i_flags & EXT2_FL_USER_VISIBLE;
- return put_user(flags, (int *) arg);
- case EXT2_IOC_SETFLAGS: {
- unsigned int oldflags;
- 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.ext2_i.i_flags;
- /*
- * 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) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
- if (!capable(CAP_LINUX_IMMUTABLE))
- return -EPERM;
- }
- flags = flags & EXT2_FL_USER_MODIFIABLE;
- flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
- inode->u.ext2_i.i_flags = flags;
- if (flags & EXT2_SYNC_FL)
- inode->i_flags |= S_SYNC;
- else
- inode->i_flags &= ~S_SYNC;
- if (flags & EXT2_APPEND_FL)
- inode->i_flags |= S_APPEND;
- else
- inode->i_flags &= ~S_APPEND;
- if (flags & EXT2_IMMUTABLE_FL)
- inode->i_flags |= S_IMMUTABLE;
- else
- inode->i_flags &= ~S_IMMUTABLE;
- if (flags & EXT2_NOATIME_FL)
- inode->i_flags |= S_NOATIME;
- else
- inode->i_flags &= ~S_NOATIME;
- inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(inode);
- return 0;
- }
- case EXT2_IOC_GETVERSION:
- return put_user(inode->i_generation, (int *) arg);
- case EXT2_IOC_SETVERSION:
- if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
- return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(inode->i_generation, (int *) arg))
- return -EFAULT;
- inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(inode);
- return 0;
- default:
- return -ENOTTY;
- }
- }