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Disable multiple ntfs mounts to the same mountpoint.

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Eliminates panics due to locking issues.
Idea taken from src/sys/gnu/fs/xfs/FreeBSD/xfs_super.c.

PR:	89966, 92000, 104393
Reported by:	H. Matsuo <hiroshi50000 yahoo co jp>,
		Chris <m2chrischou gmail.com>,
		Andrey V. Elsukov <bu7cher yandex ru>,
		Jan Henrik Sylvester <me janh de>
Approved by:	re (kensmith)
This commit is contained in:
Craig Rodrigues 2007-09-21 23:50:15 +00:00
parent 3011bef433
commit 00cedf971b
1 changed files with 15 additions and 1 deletions
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16
sys/fs/ntfs/ntfs_vfsops.c
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@ -261,12 +261,26 @@ ntfs_mountfs(devvp, mp, td)
int error, ronly, i, v;
struct vnode *vp;
struct g_consumer *cp;
struct g_provider *pp;
char *cs_ntfs, *cs_local;
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
DROP_GIANT();
g_topology_lock();
error = g_vfs_open(devvp, &cp, "ntfs", ronly ? 0 : 1);
/*
* XXX: Do not allow more than one consumer to open a device
* associated with a particular GEOM provider.
* This disables multiple read-only mounts of a device,
* but it gets rid of panics in vget() when you try to
* mount the same device more than once.
*/
pp = g_dev_getprovider(devvp->v_rdev);
if ((pp != NULL) && ((pp->acr | pp->acw | pp->ace ) != 0))
error = EPERM;
else
error = g_vfs_open(devvp, &cp, "ntfs", ronly ? 0 : 1);
g_topology_unlock();
PICKUP_GIANT();
VOP_UNLOCK(devvp, 0, td);