/* * 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/mount.h> #include <linux/time.h> #include <linux/sched.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; } long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = filp->f_dentry->d_inode; struct jfs_inode_info *jfs_inode = JFS_IP(inode); unsigned int flags; switch (cmd) { case JFS_IOC_GETFLAGS: jfs_get_inode_flags(jfs_inode); 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; int err; err = mnt_want_write(filp->f_path.mnt); if (err) return err; if (!is_owner_or_cap(inode)) { err = -EACCES; goto setflags_out; } if (get_user(flags, (int __user *) arg)) { err = -EFAULT; goto setflags_out; } flags = jfs_map_ext2(flags, 1); if (!S_ISDIR(inode->i_mode)) flags &= ~JFS_DIRSYNC_FL; /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { err = -EPERM; goto setflags_out; } /* Lock against other parallel changes of flags */ mutex_lock(&inode->i_mutex); jfs_get_inode_flags(jfs_inode); 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)) { mutex_unlock(&inode->i_mutex); err = -EPERM; goto setflags_out; } } flags = flags & JFS_FL_USER_MODIFIABLE; flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; jfs_inode->mode2 = flags; jfs_set_inode_flags(inode); mutex_unlock(&inode->i_mutex); inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); setflags_out: mnt_drop_write(filp->f_path.mnt); return err; } default: return -ENOTTY; } } #ifdef CONFIG_COMPAT long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { /* While these ioctl numbers defined with 'long' and have different * numbers than the 64bit ABI, * the actual implementation only deals with ints and is compatible. */ switch (cmd) { case JFS_IOC_GETFLAGS32: cmd = JFS_IOC_GETFLAGS; break; case JFS_IOC_SETFLAGS32: cmd = JFS_IOC_SETFLAGS; break; } return jfs_ioctl(filp, cmd, arg); } #endif