opensolaris_lookup: use vfs_busy in traverse before calling VFS_ROOT
... to ensure that we have a valid mountpoint during the call. Reviewed by: kib MFC after: 19 days
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=242569
@ -88,6 +88,7 @@ traverse(vnode_t **cvpp, int lktype)
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vfsp = vn_mountedvfs(cvp);
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if (vfsp == NULL)
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break;
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error = vfs_busy(vfsp, 0);
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/*
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* tvp is NULL for *cvpp vnode, which we can't unlock.
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*/
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@ -95,12 +96,15 @@ traverse(vnode_t **cvpp, int lktype)
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vput(cvp);
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else
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vrele(cvp);
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if (error)
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return (error);
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/*
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* The read lock must be held across the call to VFS_ROOT() to
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* prevent a concurrent unmount from destroying the vfs.
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*/
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error = VFS_ROOT(vfsp, lktype, &tvp);
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vfs_unbusy(vfsp);
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if (error != 0)
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return (error);
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cvp = tvp;
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