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Proof step 30 from proof refine-readpage (previous step)

# buf0 = VFS_PAGE_SIZE, fs[ri[datakey(m, pageno)]] = datanode(key, buf1), buf = buf0, buf2 = buf0, dirs = abs-dirs(fs, ri), err = err1, files = abs-files(fs, ri), inode = mkinode(m, md, boolvar1, m0, m1, m2), orphans(fs, ri).inodes?, fo.inodes?, afs-cons(abs-dirs(fs, ri), abs-files(fs, ri)), file-node-cons(fs, ri), log-cons(log, fs), orphans-cons(fs, ri, orphans(fs, ri)), replay-cons-strong(fs, ri, orphans(fs, ri), fi, fo, log), ri-inj(ri), ri-inj(fi), ubifs-cons(fs, ri, orphans(fs, ri), fi, fo, log), inodekey(m) ∈ ri, datakey(m, pageno) ∈ ri, ri[datakey(m, pageno)] ∈ fs, asynced → boolvar2 ⊦ ⟨{if pageno ∈ files[inode.ino].content then buf := files[inode.ino].content[pageno] else buf := zeropage; err := ESUCCESS} or fail#(; ; err)⟩ ((asynced → boolvar2) ∧ copy(buf1, 0, buf2, 0, VFS_PAGE_SIZE) = buf ∧ ESUCCESS = err), fs[ri[inodekey(m)]].directory

Heuristic symbolic execution applied rule or right

And obtained the following new goals

Rule argument

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