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Theorem fsync-pages-overwrite

valid-file-inode(inode, dirs, files), pcache-cons(pcache, dirs, files), afs-cons(dirs, files), files = files0, pcache0 = pcache ⊦ [cache_fsync-pages#(inode, dirs; err, files, pcache, asynced)] (err = ESUCCESS → files[inode.ino].trunc(inode.size) = (files0 ⊕ pcache0)[inode.ino].trunc(inode.size))

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