Date: Wed, 2 Aug 2017 12:35:47 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Konstantin Belousov <kib@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r321920 - head/sys/sys Message-ID: <7b1d274f-a531-f788-742a-a8375fe76763@selasky.org> In-Reply-To: <201708021014.v72AEHEk061037@repo.freebsd.org> References: <201708021014.v72AEHEk061037@repo.freebsd.org>
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On 08/02/17 12:14, Konstantin Belousov wrote: > Author: kib > Date: Wed Aug 2 10:14:17 2017 > New Revision: 321920 > URL: https://svnweb.freebsd.org/changeset/base/321920 > > Log: > Change major()/minor() to work with 64bit dev_t. > > Since traditional types for the macros values are int, remove the > cookie trick and just split the dev_t at the word boundary. > > Reported by: Victor Stinner <victor.stinner@gmail.com> > PR: 221048 > Sponsored by: The FreeBSD Foundation > > Modified: > head/sys/sys/types.h > > Modified: head/sys/sys/types.h > ============================================================================== > --- head/sys/sys/types.h Wed Aug 2 10:12:10 2017 (r321919) > +++ head/sys/sys/types.h Wed Aug 2 10:14:17 2017 (r321920) > @@ -364,14 +364,9 @@ __bitcount64(__uint64_t _x) > > #include <sys/select.h> > > -/* > - * minor() gives a cookie instead of an index since we don't want to > - * change the meanings of bits 0-15 or waste time and space shifting > - * bits 16-31 for devices that don't use them. > - */ > -#define major(x) ((int)(((u_int)(x) >> 8)&0xff)) /* major number */ > -#define minor(x) ((int)((x)&0xffff00ff)) /* minor number */ > -#define makedev(x,y) ((dev_t)(((x) << 8) | (y))) /* create dev_t */ > +#define major(x) ((int)((dev_t)(x) >> 32)) /* major number */ > +#define minor(x) ((int)((x) & 0xffffffff)) /* minor number */ > +#define makedev(x, y) (((dev_t)(x) << 32) | (y)) /* create dev_t */ > > /* > * These declarations belong elsewhere, but are repeated here and in > Hi, This change breaks the LinuxKPI: > struct linux_cdev * > linux_find_cdev(const char *name, unsigned major, unsigned minor) > { > int unit = MKDEV(major, minor); > struct cdev *cdev; > > dev_lock(); > LIST_FOREACH(cdev, &linuxcdevsw.d_devs, si_list) { > struct linux_cdev *ldev = cdev->si_drv1; > if (dev2unit(cdev) == unit && > strcmp(kobject_name(&ldev->kobj), name) == 0) { > break; > } > } > dev_unlock(); > > return (cdev != NULL ? cdev->si_drv1 : NULL); > } You will also need to change cdev->si_drv0 to dev_t and fix the make_dev() functions too. > struct cdev { > void *si_spare0; > u_int si_flags; > #define SI_ETERNAL 0x0001 /* never destroyed */ > #define SI_ALIAS 0x0002 /* carrier of alias name */ > #define SI_NAMED 0x0004 /* make_dev{_alias} has been called */ > #define SI_CHEAPCLONE 0x0008 /* can be removed_dev'ed when vnode reclaims */ > #define SI_CHILD 0x0010 /* child of another struct cdev **/ > #define SI_DUMPDEV 0x0080 /* is kernel dumpdev */ > #define SI_CLONELIST 0x0200 /* on a clone list */ > #define SI_UNMAPPED 0x0400 /* can handle unmapped I/O */ > #define SI_NOSPLIT 0x0800 /* I/O should not be split up */ > struct timespec si_atime; > struct timespec si_ctime; > struct timespec si_mtime; > uid_t si_uid; > gid_t si_gid; > mode_t si_mode; > struct ucred *si_cred; /* cached clone-time credential */ > int si_drv0; Further this update assigns a 64-bit value to tfsid.val[0], which is 32-bit ?? > sys/sys/mount.h:typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */ sys/kern/vfs_subr.c: tfsid.val[0] = makedev(255, And there are more places like this! Did you properly check all uses of makedev() in the kernel before making this change? --HPS
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