Release the v_writecount reference on the vnode in case of error,
before the vnode is vput() in vm_mmap_vnode(). Error return means that there is no use reference on the vnode from the vm object reference, and failing to restore v_writecount breaks the invariant that v_writecount is less or equal to the usecount. The situation observed when nfs client returns ESTALE for VOP_GETATTR() after the open. In collaboration with: pho MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=248815
@ -1345,6 +1345,10 @@ vm_mmap_vnode(struct thread *td, vm_size_t objsize,
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vfs_mark_atime(vp, cred);
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done:
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if (error != 0 && *writecounted) {
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*writecounted = FALSE;
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vnode_pager_update_writecount(obj, objsize, 0);
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}
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vput(vp);
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return (error);
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}
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