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Just like the other file systems found in /sys/fs, g_vfs_open()

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should be paried with g_vfs_close().  Though g_vfs_close() is a wrapper
around g_wither_geom_close(), r206130 added the following test in
g_vfs_open():

	if (bo->bo_private != vp)
		return (EBUSY);

  Which will cause a 'Device busy' error inside reiserfs_mountfs() if
the same file system is re-mounted again after umount or mounting failure:

	(case 1, /dev/ad4s3 is not a valid REISERFS partition)
	# mount -t reiserfs -o ro /dev/ad4s3 /mnt
	mount: /dev/ad4s3: Invalid argument
	# mount -t msdosfs -o ro /dev/ad4s3 /mnt
	mount: /dev/ad4s3: Device busy

	(case 2, /dev/ad4s3 is a valid REISERFS partition)
	# mount -t reiserfs -o ro /dev/ad4s3 /mnt
	# umount /mnt
	# mount -t reiserfs -o ro /dev/ad4s3 /mnt
	mount: /dev/ad4s3: Device busy

  On the other hand, g_vfs_close() 'fixed' the above cases by doing an
extra step to keep 'sc->sc_bo->bo_private' and 'cp->private' pointers
synchronised.

Reviewed by:	kib
MFC after:	1 month
This commit is contained in:
Tai-hwa Liang 2012-08-01 23:05:57 +00:00
parent 26d121f5df
commit 50e91f8ce1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=238980
1 changed files with 2 additions and 2 deletions
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4
sys/gnu/fs/reiserfs/reiserfs_vfsops.c
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@ -227,7 +227,7 @@ reiserfs_unmount(struct mount *mp, int mntflags)
DROP_GIANT();
g_topology_lock();
g_wither_geom_close(rmp->rm_cp->geom, ENXIO);
g_vfs_close(rmp->rm_cp);
g_topology_unlock();
PICKUP_GIANT();
vrele(rmp->rm_devvp);
@ -611,7 +611,7 @@ reiserfs_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td)
if (cp != NULL) {
DROP_GIANT();
g_topology_lock();
g_wither_geom_close(cp->geom, ENXIO);
g_vfs_close(cp);
g_topology_unlock();
PICKUP_GIANT();
}