From: Al Viro viro@zeniv.linux.org.uk
Handle ioctls that might be handled without reaching ->ioctl() in native case on the top level there. The counterpart of vfs_ioctl() (i.e. calling ->unlock_ioctl(), etc.) left as-is; eventually that would turn simply into the call of ->compat_ioctl(), but that'll take more work. Once that is done, we can move the remains of compat_sys_ioctl() into fs/ioctl.c and finally bury fs/compat_ioctl.c.
Signed-off-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Arnd Bergmann arnd@arndb.de --- fs/compat_ioctl.c | 63 +++++++++++++++++++++-------------------------- 1 file changed, 28 insertions(+), 35 deletions(-)
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index ce995d4fa1f4..ecbd5254b547 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -487,19 +487,7 @@ static unsigned int ioctl_pointer[] = { /* compatible ioctls first */ /* Little t */ COMPATIBLE_IOCTL(TIOCOUTQ) -/* Little f */ -COMPATIBLE_IOCTL(FIOCLEX) -COMPATIBLE_IOCTL(FIONCLEX) -COMPATIBLE_IOCTL(FIOASYNC) -COMPATIBLE_IOCTL(FIONBIO) -COMPATIBLE_IOCTL(FIONREAD) /* This is also TIOCINQ */ -COMPATIBLE_IOCTL(FS_IOC_FIEMAP) -/* 0x00 */ -COMPATIBLE_IOCTL(FIBMAP) -COMPATIBLE_IOCTL(FIGETBSZ) /* 'X' - originally XFS but some now in the VFS */ -COMPATIBLE_IOCTL(FIFREEZE) -COMPATIBLE_IOCTL(FITHAW) COMPATIBLE_IOCTL(FITRIM) #ifdef CONFIG_BLOCK /* Big S */ @@ -971,19 +959,39 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, if (error) goto out_fput;
- /* - * To allow the compat_ioctl handlers to be self contained - * we need to check the common ioctls here first. - * Just handle them with the standard handlers below. - */ switch (cmd) { + /* these are never seen by ->ioctl(), no argument or int argument */ case FIOCLEX: case FIONCLEX: + case FIFREEZE: + case FITHAW: + case FICLONE: + goto do_ioctl; + /* these are never seen by ->ioctl(), pointer argument */ case FIONBIO: case FIOASYNC: case FIOQSIZE: - break; - + case FS_IOC_FIEMAP: + case FIGETBSZ: + case FICLONERANGE: + case FIDEDUPERANGE: + goto found_handler; + /* + * The next group is the stuff handled inside file_ioctl(). + * For regular files these never reach ->ioctl(); for + * devices, sockets, etc. they do and one (FIONREAD) is + * even accepted in some cases. In all those cases + * argument has the same type, so we can handle these + * here, shunting them towards do_vfs_ioctl(). + * ->compat_ioctl() will never see any of those. + */ + /* pointer argument, never actually handled by ->ioctl() */ + case FIBMAP: + goto found_handler; + /* handled by some ->ioctl(); always a pointer to int */ + case FIONREAD: + goto found_handler; + /* these two get messy on amd64 due to alignment differences */ #if defined(CONFIG_X86_64) case FS_IOC_RESVSP_32: case FS_IOC_RESVSP64_32: @@ -992,23 +1000,8 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, #else case FS_IOC_RESVSP: case FS_IOC_RESVSP64: - error = ioctl_preallocate(f.file, compat_ptr(arg)); - goto out_fput; -#endif - - case FICLONE: - goto do_ioctl; - case FICLONERANGE: - case FIDEDUPERANGE: - case FS_IOC_FIEMAP: - case FIGETBSZ: goto found_handler; - - case FIBMAP: - case FIONREAD: - if (S_ISREG(file_inode(f.file)->i_mode)) - break; - /*FALL THROUGH*/ +#endif
default: if (f.file->f_op->compat_ioctl) {