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Proof step 4 from proof readpage-prepost (previous step)

((m0 =>mkfile(n0, md, m, σ) * F))(files), afs-cons(dirs, files) ⊦ [afs_readpage#(mkinode(m0, md0, boolvar, m1, m2, m3), n, dirs, files, asynced; buf, err)] (err = ESUCCESS ∧ ⌜buf⌝ = (σ from n * VFS_PAGE_SIZE) to VFS_PAGE_SIZE ∨ ⌊err⌋ )

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 5:
inode = mkinode(m0, md0, boolvar, m1, m2, m3), pageno = n, ((m0 =>mkfile(n0, md, m, σ) * F))(files), afs-cons(dirs, files) ⊦ [if pre-readpage(inode, pageno, buf, dirs, files) then { {if pageno ∈ files[inode.ino].content then buf := files[inode.ino].content[pageno] else buf := zeropage; err := ESUCCESS} or fail#(; ; err)} else abort] (err = ESUCCESS ∧ ⌜buf⌝ = (σ from n * VFS_PAGE_SIZE) to VFS_PAGE_SIZE ∨ ⌊err⌋ )

Rule argument

pos: right 1

Additional information

Used simplifier rules: afs_readpage#(INODE, PAGENO, DIRS, FILES, ASYNCED; PBUF, ERR) {if pre-readpage(INODE, PAGENO, PBUF, DIRS, FILES) then { {if PAGENO ∈ FILES[INODE.ino].content then PBUF := FILES[INODE.ino].content[PAGENO] else PBUF := zeropage; ERR := ESUCCESS} or fail#(; ; ERR)} else abort };