Further refine r352393, only call vnode_pager_setsize() outside the
node lock when shrinking. This is similar to r252528, applied to the above commit. Apparently there is a race which makes necessary at least to keep the n_size and pager size consistent when extending. Current suspect is that iod threads perform vnode_pager_setsize() without taking the vnode lock, which corrupts the file content. Reported and tested by: Masachika ISHIZUKA <ish@amail.plala.or.jp> Discussed with: rmacklem (related issues) Sponsored by: The FreeBSD Foundation MFC after: 1 week
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@ -414,12 +414,12 @@ nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
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struct nfsnode *np;
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struct nfsmount *nmp;
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struct timespec mtime_save;
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vm_object_t object;
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u_quad_t nsize;
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int setnsize, error, force_fid_err;
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int error, force_fid_err;
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bool setnsize;
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error = 0;
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setnsize = 0;
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nsize = 0;
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/*
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* If v_type == VNON it is a new node, so fill in the v_type,
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@ -511,8 +511,7 @@ nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
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* zero np->n_attrstamp to indicate that
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* the attributes are stale.
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*/
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nsize = vap->va_size = np->n_size;
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setnsize = 1;
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vap->va_size = np->n_size;
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np->n_attrstamp = 0;
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KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
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} else if (np->n_flag & NMODIFIED) {
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@ -526,22 +525,9 @@ nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
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np->n_size = vap->va_size;
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np->n_flag |= NSIZECHANGED;
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}
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nsize = np->n_size;
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setnsize = 1;
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} else if (vap->va_size < np->n_size) {
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/*
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* When shrinking the size, the call to
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* vnode_pager_setsize() cannot be done
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* with the mutex held, so delay it until
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* after the mtx_unlock call.
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*/
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nsize = np->n_size = vap->va_size;
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np->n_flag |= NSIZECHANGED;
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setnsize = 1;
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} else {
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nsize = np->n_size = vap->va_size;
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np->n_size = vap->va_size;
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np->n_flag |= NSIZECHANGED;
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setnsize = 1;
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}
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} else {
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np->n_size = vap->va_size;
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@ -579,6 +565,23 @@ nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
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if (np->n_attrstamp != 0)
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KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
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#endif
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nsize = vap->va_size;
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object = vp->v_object;
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setnsize = false;
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if (object != NULL) {
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if (OFF_TO_IDX(nsize + PAGE_MASK) < object->size) {
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/*
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* When shrinking the size, the call to
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* vnode_pager_setsize() cannot be done with
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* the mutex held, because we might need to
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* wait for a busy page. Delay it until after
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* the node is unlocked.
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*/
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setnsize = true;
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} else {
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vnode_pager_setsize(vp, nsize);
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}
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}
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NFSUNLOCKNODE(np);
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if (setnsize)
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vnode_pager_setsize(vp, nsize);
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