/* * linux/fs/jfs/ioctl.c * * Copyright (C) 2006 Herbert Poetzl * adapted from Remy Card's ext2/ioctl.c */ #include <linux/fs.h> #include <linux/ctype.h> #include <linux/capability.h> #include <linux/time.h> #include <asm/current.h> #include <asm/uaccess.h> #include "jfs_incore.h" #include "jfs_dinode.h" #include "jfs_inode.h" static struct { long jfs_flag; long ext2_flag; } jfs_map[] = { {JFS_NOATIME_FL, FS_NOATIME_FL}, {JFS_DIRSYNC_FL, FS_DIRSYNC_FL}, {JFS_SYNC_FL, FS_SYNC_FL}, {JFS_SECRM_FL, FS_SECRM_FL}, {JFS_UNRM_FL, FS_UNRM_FL}, {JFS_APPEND_FL, FS_APPEND_FL}, {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL}, {0, 0}, }; static long jfs_map_ext2(unsigned long flags, int from) { int index=0; long mapped=0; while (jfs_map[index].jfs_flag) { if (from) { if (jfs_map[index].ext2_flag & flags) mapped |= jfs_map[index].jfs_flag; } else { if (jfs_map[index].jfs_flag & flags) mapped |= jfs_map[index].ext2_flag; } index++; } return mapped; } int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg) { struct jfs_inode_info *jfs_inode = JFS_IP(inode); unsigned int flags; switch (cmd) { case JFS_IOC_GETFLAGS: flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE; flags = jfs_map_ext2(flags, 0); return put_user(flags, (int __user *) arg); case JFS_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 __user *) arg)) return -EFAULT; flags = jfs_map_ext2(flags, 1); if (!S_ISDIR(inode->i_mode)) flags &= ~JFS_DIRSYNC_FL; oldflags = jfs_inode->mode2; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. */ if ((oldflags & JFS_IMMUTABLE_FL) || ((flags ^ oldflags) & (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { if (!capable(CAP_LINUX_IMMUTABLE)) return -EPERM; } flags = flags & JFS_FL_USER_MODIFIABLE; flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; jfs_inode->mode2 = flags; jfs_set_inode_flags(inode); inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); return 0; } default: return -ENOTTY; } }