test_virtmem.c 52 KB
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/* Wendelin.bigfile | virtual memory tests
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 * Copyright (C) 2014-2019  Nexedi SA and Contributors.
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 *                          Kirill Smelkov <kirr@nexedi.com>
 *
 * This program is free software: you can Use, Study, Modify and Redistribute
 * it under the terms of the GNU General Public License version 3, or (at your
 * option) any later version, as published by the Free Software Foundation.
 *
 * You can also Link and Combine this program with other software covered by
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 * the terms of any of the Free Software licenses or any of the Open Source
 * Initiative approved licenses and Convey the resulting work. Corresponding
 * source of such a combination shall include the source code for all other
 * software used.
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 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See COPYING file for full licensing terms.
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 * See https://www.nexedi.com/licensing for rationale and options.
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 */

// XXX better link with it
#include "../virtmem.c"
#include    "../pagemap.c"
#include    "../ram.c"
#include "../ram_shmfs.c"
#include "../pagefault.c"

#include <ccan/tap/tap.h>
#include <setjmp.h>
#include <signal.h>
#include <errno.h>

#include "../../t/t_utils.h"
#include   "../../t/t_utils.c"

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/* test_vmamap verifies addr -> VMA lookup. */
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void test_vmamap()
{
    VMA vma1, vma2, vma3;

    vma1.addr_start = 0x1000;
    vma1.addr_stop  = 0x2000;

    vma2.addr_start = 0x2000;
    vma2.addr_stop  = 0x3000;

    vma3.addr_start = 0x3000;
    vma3.addr_stop  = 0x4000;

    VMA *L(uintptr_t addr)  { return virt_lookup_vma((void *)addr); }

    diag("Testing vmamap");
    ok1(list_empty(&vma_list));
    ok1(!L(0));
    ok1(!L(0x1000-1));
    ok1(!L(0x1000));
    ok1(!L(0x1800));
    ok1(!L(0x2000-1));
    ok1(!L(0x2000));

    virt_register_vma(&vma3);
    ok1(!L(0x3000-1));
    ok1( L(0x3000) == &vma3 );
    ok1( L(0x3800) == &vma3 );
    ok1( L(0x4000-1) == &vma3 );
    ok1(!L(0x4000));

    virt_register_vma(&vma1);
    ok1(!L(0x1000-1));
    ok1( L(0x1000) == &vma1 );
    ok1( L(0x1800) == &vma1 );
    ok1( L(0x2000-1) == &vma1 );
    ok1(!L(0x2000));
    ok1(!L(0x3000-1));
    ok1( L(0x3000) == &vma3 );
    ok1( L(0x3800) == &vma3 );
    ok1( L(0x4000-1) == &vma3 );
    ok1(!L(0x4000));

    virt_register_vma(&vma2);
    ok1(!L(0x1000-1));
    ok1( L(0x1000) == &vma1 );
    ok1( L(0x1800) == &vma1 );
    ok1( L(0x2000-1) == &vma1 );
    ok1( L(0x2000) == &vma2 );
    ok1( L(0x2800) == &vma2 );
    ok1( L(0x3000-1) == &vma2);
    ok1( L(0x3000) == &vma3 );
    ok1( L(0x3800) == &vma3 );
    ok1( L(0x4000-1) == &vma3 );
    ok1(!L(0x4000));

    virt_unregister_vma(&vma3);
    ok1(!L(0x1000-1));
    ok1( L(0x1000) == &vma1 );
    ok1( L(0x1800) == &vma1 );
    ok1( L(0x2000-1) == &vma1 );
    ok1( L(0x2000) == &vma2 );
    ok1( L(0x2800) == &vma2 );
    ok1( L(0x3000-1) == &vma2);
    ok1(!L(0x3000));
    ok1(!L(0x3800));
    ok1(!L(0x4000-1));
    ok1(!L(0x4000));

    virt_register_vma(&vma3);
    ok1(!L(0x1000-1));
    ok1( L(0x1000) == &vma1 );
    ok1( L(0x1800) == &vma1 );
    ok1( L(0x2000-1) == &vma1 );
    ok1( L(0x2000) == &vma2 );
    ok1( L(0x2800) == &vma2 );
    ok1( L(0x3000-1) == &vma2);
    ok1( L(0x3000) == &vma3 );
    ok1( L(0x3800) == &vma3 );
    ok1( L(0x4000-1) == &vma3 );
    ok1(!L(0x4000));

    virt_unregister_vma(&vma2);
    ok1(!L(0x1000-1));
    ok1( L(0x1000) == &vma1 );
    ok1( L(0x1800) == &vma1 );
    ok1( L(0x2000-1) == &vma1 );
    ok1(!L(0x2000));
    ok1(!L(0x2800));
    ok1(!L(0x3000-1));
    ok1( L(0x3000) == &vma3 );
    ok1( L(0x3800) == &vma3 );
    ok1( L(0x4000-1) == &vma3 );
    ok1(!L(0x4000));

    virt_unregister_vma(&vma1);
    ok1(!L(0x1000-1));
    ok1(!L(0x1000));
    ok1(!L(0x1800));
    ok1(!L(0x2000-1));
    ok1(!L(0x2000));
    ok1(!L(0x2800));
    ok1(!L(0x3000-1));
    ok1( L(0x3000) == &vma3 );
    ok1( L(0x3800) == &vma3 );
    ok1( L(0x4000-1) == &vma3 );
    ok1(!L(0x4000));

    virt_unregister_vma(&vma3);
    ok1(!L(0x1000-1));
    ok1(!L(0x1000));
    ok1(!L(0x1800));
    ok1(!L(0x2000-1));
    ok1(!L(0x2000));
    ok1(!L(0x2800));
    ok1(!L(0x3000-1));
    ok1(!L(0x3000));
    ok1(!L(0x3800));
    ok1(!L(0x4000-1));
    ok1(!L(0x4000));

    ok1(list_empty(&vma_list));
}


/* file that reads #blk on loadblk(blk) */
struct BigFileIdentity {
    BigFile;
};
typedef struct BigFileIdentity BigFileIdentity;


int fileid_loadblk(BigFile *file, blk_t blk, void *buf)
{
    blk_t  *bbuf  = buf;
    size_t  bsize = file->blksize / sizeof(*bbuf);

    while (bsize--)
        *bbuf++ = blk;

    return 0;
}


static const struct bigfile_ops fileid_ops = {
    .loadblk    = fileid_loadblk,
    .storeblk   = NULL, // XXX
    .release    = NULL, // XXX
};



/* tell ASAN we are using own SIGSEGV handler in MUST_FAULT */
const char *__asan_default_options()
{
    return "allow_user_segv_handler=1";
}

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/* tell TSAN we are OK with calling async-sig-unsafe functions from sync SIGSEGV */
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const char *__tsan_default_options()
{
    return "report_signal_unsafe=0";
}


/* whether appropriate page of vma is mapped */
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// XXX BUG on out-of-bounds
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int M(VMA *vma, pgoff_t idx) {  return bitmap_test_bit(vma->page_ismappedv, idx);   }


/* check that
 *
 * - page != NULL,
 * - page is the same as fileh->pagemap[pgoffset],
 * - with expected page->state and page->refcnt.
 */
#define __CHECK_PAGE(page, fileh, pgoffset, pgstate, pgrefcnt) do { \
    ok1(page);                                                      \
    ok1(page == pagemap_get(&(fileh)->pagemap, (pgoffset)));        \
    ok1((page)->state  == (pgstate));                               \
    ok1((page)->refcnt == (pgrefcnt));                              \
} while (0)

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/* check that fileh->pagemap[pgoffset] is empty */
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#define __CHECK_NOPAGE(fileh, pgoffset) do {            \
    ok1(!pagemap_get(&(fileh)->pagemap, (pgoffset)));   \
} while (0)

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/* _pagev_str returns string representation for vector of pages.
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 * returned memory has to be freed by user. */
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char *_pagev_str(Page **pagev, int pagec) {
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        char *vstr; size_t _;
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        FILE *w = open_memstream(&vstr, &_);

        for (int i=0; i<pagec; i++)
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            fprintf(w, "%sp%ld%s", (i == 0 ? "[" : ", "),
                    pagev[i]->f_pgoffset, (i == pagec - 1 ? "]" : ""));
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        fclose(w);
        return vstr;
}

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/* _assert_pagev asserts that two page vectors are the same */
void _assert_pagev(const char *subj, Page **vok, int nok, Page **pagev, int n,
                   const char *func, const char *file, int line)
{
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    char *vstr = _pagev_str(pagev, n);
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    if (!(n == nok && !memcmp(pagev, vok, n*sizeof(*pagev)))) {
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        char *vstr_ok = _pagev_str(vok, nok);
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        fprintf(stderr, "%s: failed\n", subj);
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        fprintf(stderr, "have: %s\n", vstr);
        fprintf(stderr, "want: %s\n", vstr_ok);
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        _gen_result(0, func, file, line, "%s failed", subj);
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        free(vstr_ok);
    } else {
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        pass("%s %s", subj, vstr);
    }
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    free(vstr);
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}

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/* _check_mru checks that ram has MRU pages as specified by mruok. */
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void _check_mru(RAM *ram, Page *mruok[], int nok, const char *func, const char *file, int line) {
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    Page **mruv = NULL;
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    int n = 0;
    struct list_head *h;

    // collect mruv
    list_for_each_backwardly(h, &ram->lru_list) {
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        n++;
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        mruv = realloc(mruv, n*sizeof(*mruv));
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        mruv[n-1] = list_entry(h, Page, lru);
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    }

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    _assert_pagev("check_mru", mruok, nok, mruv, n, func, file, line);
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    free(mruv);
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}

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/* __CHECK_MRU(ram, ...pagev) - assert that ram has MRU pages as expected */
#define __CHECK_MRU(ram, ...) do {                                                  \
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    Page *__mruok[] = {__VA_ARGS__};                                                \
    _check_mru(ram, __mruok, ARRAY_SIZE(__mruok), __func__, __FILE__, __LINE__);    \
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} while(0)


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/* _check_dirty checks that fileh has dirty pages as specified.
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 * the order of dirty list traversal is to go through most recently dirtied pages first. */
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void _check_dirty(BigFileH *fileh, Page *dirtyok[], int nok, const char *func, const char *file, int line) {
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    Page **dirtyv = NULL;
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    int n = 0;
    struct list_head *h;

    // collect dirtyv
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    list_for_each_backwardly(h, &fileh->dirty_pages) {
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        n++;
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        dirtyv = realloc(dirtyv, n*sizeof(*dirtyv));
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        dirtyv[n-1] = list_entry(h, Page, in_dirty);
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    }

    _assert_pagev("check_dirty", dirtyok, nok, dirtyv, n, func, file, line);
    free(dirtyv);

}

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/* __CHECK_DIRTY(fileh, ...pagev) - assert that fileh has dirty pages as expected */
#define __CHECK_DIRTY(fileh, ...) do {                                                      \
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    Page *__dirtyok[] = {__VA_ARGS__};                                                      \
    _check_dirty(fileh, __dirtyok, ARRAY_SIZE(__dirtyok), __func__, __FILE__, __LINE__);    \
} while(0)



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/* vma_on_pagefault() assumes virtmem_lock is taken by caller and can ask it to
 * retry. Handle fault to the end, like on_pagefault() does. */
void xvma_on_pagefault(VMA *vma, uintptr_t addr, int write) {
    virt_lock();
    while (1) {
        VMFaultResult vmres;
        vmres = vma_on_pagefault(vma, addr, write);

        if (vmres == VM_HANDLED)
            break;
        if (vmres == VM_RETRY)
            continue;

        fail("Unexpected return code from vma_on_pagefault: %i", vmres);
    }
    virt_unlock();
}


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/* test access to file mappings via explicit vma_on_pagefault() calls */
void test_file_access_synthetic(void)
{
    RAM *ram, *ram0;
    BigFileH fh_struct, *fh = &fh_struct;
    VMA vma_struct, *vma = &vma_struct;
    Page *page0, *page1, *page2, *page3;
    blk_t *b0, *b2;
    size_t PS, PSb;
    int err;

    /* MUST_FAULT(code) - checks that code faults */
    sigjmp_buf    fault_jmp;
    volatile int  fault_expected = 0;
    void sigfault_handler(int sig) {
        if (!fault_expected) {
            diag("Unexpected fault - abort");
            abort();
        }
        /* just return from sighandler to proper place */
        fault_expected = 0;
        siglongjmp(fault_jmp, 1);
    }
#define MUST_FAULT(code) do {                                   \
    fault_expected = 1;                                         \
    if (!sigsetjmp(fault_jmp, 1)) {                             \
        code; /* should pagefault -> sighandler does longjmp */ \
        fail("'" #code "' did not cause fault");                \
    }                                                           \
    else {                                                      \
        pass("'" #code "' faulted");                            \
    }                                                           \
} while (0)


    diag("Testing file access (synthetic)");

    struct sigaction act, saveact;
    act.sa_handler = sigfault_handler;
    act.sa_flags   = 0;
    ok1(!sigemptyset(&act.sa_mask));
    ok1(!sigaction(SIGSEGV, &act, &saveact));

    /* ram limited to exactly 3 pages (so that we know we trigger reclaim on
     * exactly when allocating more) */
    ram0 = ram_new(NULL, NULL);
    ok1(ram0);
    ram = ram_limited_new(ram0, 3);
    ok1(ram);
    PS = ram->pagesize;
    PSb = PS / sizeof(blk_t);   /* page size in blk_t units */

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/* implicitly use ram=ram */
#define CHECK_MRU(...)  __CHECK_MRU(ram, __VA_ARGS__)

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    /* ensure we are starting from new ram */
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    CHECK_MRU(/*empty*/);
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    /* setup id file */
    struct bigfile_ops x_ops = {.loadblk = fileid_loadblk};
    BigFileIdentity fileid = {
        .blksize    = ram->pagesize,    /* artificially blksize = pagesize */
        .file_ops   = &x_ops,
    };

    err = fileh_open(fh, &fileid, ram);
    ok1(!err);
    ok1(list_empty(&fh->mmaps));

/* implicitly use fileh=fh */
#define CHECK_PAGE(page, pgoffset, pgstate, pgrefcnt)   \
                __CHECK_PAGE(page, fh, pgoffset, pgstate, pgrefcnt)
#define CHECK_NOPAGE(pgoffset)  __CHECK_NOPAGE(fh, pgoffset)
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#define CHECK_DIRTY(...)        __CHECK_DIRTY(fh, __VA_ARGS__)
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    err = fileh_mmap(vma, fh, 100, 4);
    ok1(!err);

    ok1(fh->mmaps.next == &vma->same_fileh);
    ok1(vma->same_fileh.next == &fh->mmaps);

    /* all pages initially unmapped
     * M                R                               W                           */
    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_NOPAGE(         100                      );
    CHECK_NOPAGE(         101                      );
    CHECK_NOPAGE(         102                      );
    CHECK_NOPAGE(         103                      );

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    CHECK_MRU   (/*empty*/);
    CHECK_DIRTY (/*empty */);
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    /* simulate read access to page[0] - it should load it */
    diag("read page[0]");
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    xvma_on_pagefault(vma, vma->addr_start + 0*PS, 0);
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    ok1( M(vma, 0));                B(vma, 0*PSb);      MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    page0 = pagemap_get(&fh->pagemap, 100);
    CHECK_PAGE  (page0,   100,    PAGE_LOADED,    1);
    CHECK_NOPAGE(         101                      );
    CHECK_NOPAGE(         102                      );
    CHECK_NOPAGE(         103                      );

    ok1(B(vma, 0*PSb + 0) == 100);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);

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    CHECK_MRU   (page0);
    CHECK_DIRTY (/*empty*/);
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    /* simulate write access to page[2] - it should load it and mark page dirty */
    diag("write page[2]");
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    xvma_on_pagefault(vma, vma->addr_start + 2*PS, 1);
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    ok1( M(vma, 0));                B(vma, 0*PSb);      MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    page2 = pagemap_get(&fh->pagemap, 102);
    CHECK_PAGE  (page0,   100, PAGE_LOADED,   1);
    CHECK_NOPAGE(         101                  );
    CHECK_PAGE  (page2,   102, PAGE_DIRTY,    1);
    CHECK_NOPAGE(         103                  );

    ok1(B(vma, 0*PSb + 0) == 100);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);
    ok1(B(vma, 2*PSb + 0) ==  12);  /* overwritten at fault w check */
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);

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    CHECK_MRU   (page2, page0);
    CHECK_DIRTY (page2);
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    /* read access to page[3] - load */
    diag("read page[3]");
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    xvma_on_pagefault(vma, vma->addr_start + 3*PS, 0);
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    ok1( M(vma, 0));                B(vma, 0*PSb);      MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1( M(vma, 3));                B(vma, 3*PSb);      MUST_FAULT( B(vma, 3*PSb) = 13  );

    page3 = pagemap_get(&fh->pagemap, 103);
    CHECK_PAGE  (page0,   100,    PAGE_LOADED,    1);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    1);

    ok1(B(vma, 0*PSb + 0) == 100);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);
    ok1(B(vma, 2*PSb + 0) ==  12);
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);
    ok1(B(vma, 3*PSb + 0) == 103);
    ok1(B(vma, 3*PSb + 1) == 103);
    ok1(B(vma, 3*PSb + PSb - 1) == 103);

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    CHECK_MRU   (page3, page2, page0);
    CHECK_DIRTY (page2);
505

506 507 508

    /* write access to page[0] - upgrade loaded -> dirty */
    diag("write page[0]");
509
    xvma_on_pagefault(vma, vma->addr_start + 0*PS, 1);
510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530

    ok1( M(vma, 0));                B(vma, 0*PSb);                  B(vma, 0*PSb) = 10;
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1( M(vma, 3));                B(vma, 3*PSb);      MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    1);

    ok1(B(vma, 0*PSb + 0) ==  10);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);
    ok1(B(vma, 2*PSb + 0) ==  12);
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);
    ok1(B(vma, 3*PSb + 0) == 103);
    ok1(B(vma, 3*PSb + 1) == 103);
    ok1(B(vma, 3*PSb + PSb - 1) == 103);

531 532
    CHECK_MRU   (page0, page3, page2);    /* page0 became MRU */
    CHECK_DIRTY (page0, page2);
533

534 535 536 537 538 539 540

    /* read page[1]
     *
     * as 3 pages were already allocated it should trigger reclaim (we set up
     * RAMLimited with 3 allocated pages max). Evicted will be page[3] - as it
     * is the only PAGE_LOADED page. */
    diag("read page[1]");
541
    xvma_on_pagefault(vma, vma->addr_start + 1*PS, 0);
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    ok1( M(vma, 0));                B(vma, 0*PSb);                  B(vma, 0*PSb) = 10;
    ok1( M(vma, 1));                B(vma, 1*PSb);      MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    page1 = pagemap_get(&fh->pagemap, 101);
    page3 = pagemap_get(&fh->pagemap, 103);
    ok1(!page3);
    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    CHECK_PAGE  (page1,   101,    PAGE_LOADED,    1);
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_NOPAGE(         103                      );

    ok1(B(vma, 0*PSb + 0) ==  10);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);
    ok1(B(vma, 1*PSb + 0) == 101);
    ok1(B(vma, 1*PSb + 1) == 101);
    ok1(B(vma, 1*PSb + PSb - 1) == 101);
    ok1(B(vma, 2*PSb + 0) ==  12);
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);

566 567
    CHECK_MRU   (page1, page0, page2);
    CHECK_DIRTY (page0, page2);
568

569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593

    /* now explicit reclaim - should evict page[1]  (the only PAGE_LOADED page) */
    diag("reclaim");
    ok1(1 == ram_reclaim(ram) );

    ok1( M(vma, 0));                B(vma, 0*PSb);                  B(vma, 0*PSb) = 10;
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    page1 = pagemap_get(&fh->pagemap, 101);
    ok1(!page1);
    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_NOPAGE(         103                      );

    ok1(B(vma, 0*PSb + 0) ==  10);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);
    ok1(B(vma, 2*PSb + 0) ==  12);
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);

    /* page[3] went away */
594 595
    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);
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597 598 599 600 601 602 603 604 605 606 607 608 609

    /* unmap vma - dirty pages should stay in fh->pagemap and memory should
     * not be forgotten */
    diag("vma_unmap");
    vma_unmap(vma);

    ok1(list_empty(&fh->mmaps));

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         103                      );

610 611
    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);
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613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
    b0 = page_mmap(page0, NULL, PROT_READ);
    ok1(b0);
    b2 = page_mmap(page2, NULL, PROT_READ);
    ok1(b2);

    ok1(b0[0] ==  10);
    ok1(b0[1] == 100);
    ok1(b0[PSb - 1] == 100);
    ok1(b2[0] ==  12);
    ok1(b2[1] == 102);
    ok1(b2[PSb - 1] == 102);

    xmunmap(b0, PS);
    xmunmap(b2, PS);


    /* map vma back - dirty pages should be there but not mapped to vma */
    diag("vma mmap again");
    err = fileh_mmap(vma, fh, 100, 4);
    ok1(!err);

    ok1(fh->mmaps.next == &vma->same_fileh);
    ok1(vma->same_fileh.next == &fh->mmaps);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         103                      );

647 648
    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);
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650 651 652

    /* read access to page[2] - should map it R/W - the page is in PAGE_DIRTY state */
    diag("read page[2]");
653
    xvma_on_pagefault(vma, vma->addr_start + 2*PS, 0);
654 655 656 657 658 659 660 661 662 663 664

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_NOPAGE(         103                      );

665 666
    CHECK_MRU   (page2, page0);
    CHECK_DIRTY (page0, page2);
667

668 669 670 671 672 673 674 675 676 677 678 679 680 681 682

    /* discard - changes should go away */
    diag("discard");
    fileh_dirty_discard(fh);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_EMPTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_EMPTY,     0);
    CHECK_NOPAGE(         103                      );

683 684
    CHECK_MRU   (page2, page0);
    CHECK_DIRTY (/*empty*/);
685

686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703

    /* writeout in 3 variants - STORE, MARK, STORE+MARK */
    diag("writeout");

    /* storeblk which just remembers which blk was written out */
    blk_t blkv[16];
    size_t blkv_len;
    int storeblk_trace(BigFile *file, blk_t blk, const void *buf)
    {
        ok1(blkv_len < ARRAY_SIZE(blkv));
        blkv[blkv_len++] = blk;
        return 0;
    }
    x_ops.storeblk = storeblk_trace;


    /* read  page[3] (so that we have 1 PAGE_LOADED besides PAGE_DIRTY pages) */
    ok1(!pagemap_get(&fh->pagemap, 103));
704
    xvma_on_pagefault(vma, vma->addr_start + 3*PS, 0);
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    page3 = pagemap_get(&fh->pagemap, 103);
    ok1(page3);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1( M(vma, 3));                B(vma, 3*PSb);      MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_EMPTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_EMPTY,     0);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    1);

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    CHECK_MRU   (page3, page2, page0);
    CHECK_DIRTY (/*empty*/);
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721 722 723

    /* prepare state (2 dirty pages, only 1 mapped) */
    void mkdirty2() {
724
        xvma_on_pagefault(vma, vma->addr_start + 2*PS, 1);  /* write page[2] */
725
        xvma_on_pagefault(vma, vma->addr_start + 0*PS, 1);  /* write page[0] */
726 727 728
        vma_unmap(vma);
        err = fileh_mmap(vma, fh, 100, 4);
        ok1(!err);
729
        xvma_on_pagefault(vma, vma->addr_start + 2*PS, 0);
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        ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
        ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
        ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
        ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

        CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
        CHECK_NOPAGE(         101                      );
        CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
        CHECK_PAGE  (page3,   103,    PAGE_LOADED,    0);

741 742
        CHECK_MRU   (page2, page0, page3);
        CHECK_DIRTY (page0, page2);
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
    }

    diag("writeout (store)");
    mkdirty2();
    blkv_len = 0;
    ok1(!fileh_dirty_writeout(fh, WRITEOUT_STORE));

    ok1(blkv_len == 2);
    ok1(blkv[0] == 100);
    ok1(blkv[1] == 102);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    0);

764
    /* NOTE - becomes sorted by ->f_pgoffset */
765
    CHECK_DIRTY (page2, page0); /* checked in reverse order */
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782

    diag("writeout (mark)");
    blkv_len = 0;
    ok1(!fileh_dirty_writeout(fh, WRITEOUT_MARKSTORED));

    ok1(blkv_len == 0);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);      MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_LOADED,    0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_LOADED,    1);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    0);

783 784
    CHECK_MRU   (page2, page0, page3);
    CHECK_DIRTY (/*empty*/);
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804

    diag("writeout (store+mark)");
    mkdirty2();
    blkv_len = 0;
    ok1(!fileh_dirty_writeout(fh, WRITEOUT_STORE | WRITEOUT_MARKSTORED));

    ok1(blkv_len == 2);
    ok1(blkv[0] == 100);
    ok1(blkv[1] == 102);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);      MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_LOADED,    0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_LOADED,    1);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    0);

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    CHECK_MRU   (page2, page0, page3);
    CHECK_DIRTY (/*empty*/);
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808
    /* invalidation */
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
    diag("invalidate");
    mkdirty2();

    fileh_invalidate_page(fh, 101);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    0);

824 825
    CHECK_MRU   (page2, page0, page3);
    CHECK_DIRTY (page0, page2);
826

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    fileh_invalidate_page(fh, 103);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1( M(vma, 2));                B(vma, 2*PSb);                  B(vma, 2*PSb) = 12;
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    CHECK_PAGE  (page3,   103,    PAGE_EMPTY,     0);

840 841
    CHECK_MRU   (page2, page0, page3);
    CHECK_DIRTY (page0, page2);
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    fileh_invalidate_page(fh, 102);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_EMPTY,     0);
    CHECK_PAGE  (page3,   103,    PAGE_EMPTY,     0);

856 857
    CHECK_MRU   (page2, page0, page3);
    CHECK_DIRTY (page0);
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    fileh_invalidate_page(fh, 100);

    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1(!M(vma, 3));    MUST_FAULT( B(vma, 3*PSb) );    MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_EMPTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_EMPTY,     0);
    CHECK_PAGE  (page3,   103,    PAGE_EMPTY,     0);

872 873
    CHECK_MRU   (page2, page0, page3);
    CHECK_DIRTY (/*empty*/);
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875
    /* read page[3] back */
876
    xvma_on_pagefault(vma, vma->addr_start + 3*PS, 0);
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    ok1(!M(vma, 0));    MUST_FAULT( B(vma, 0*PSb) );    MUST_FAULT( B(vma, 0*PSb) = 10  );
    ok1(!M(vma, 1));    MUST_FAULT( B(vma, 1*PSb) );    MUST_FAULT( B(vma, 1*PSb) = 11  );
    ok1(!M(vma, 2));    MUST_FAULT( B(vma, 2*PSb) );    MUST_FAULT( B(vma, 2*PSb) = 12  );
    ok1( M(vma, 3));                B(vma, 3*PSb);      MUST_FAULT( B(vma, 3*PSb) = 13  );

    CHECK_PAGE  (page0,   100,    PAGE_EMPTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_EMPTY,     0);
    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    1);

888 889
    CHECK_MRU   (page3, page2, page0);
    CHECK_DIRTY (/*empty*/);
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891

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    diag("fileh_close");
    /* dirty some pages again - so that test fileh_close with not all pages being non-dirty */
    mkdirty2();
    vma_unmap(vma);

    /* ensure pages stay in ram lru with expected state */
898
    CHECK_MRU(page2, page0, page3);
899 900 901
    ok1(page2->state == PAGE_DIRTY);
    ok1(page0->state == PAGE_DIRTY);
    ok1(page3->state == PAGE_LOADED);
902 903 904 905

    fileh_close(fh);

    /* pages associated with fileh should go away after fileh_close() */
906
    CHECK_MRU(/*empty*/);
907 908 909


    /* free resources & restore SIGSEGV handler */
910 911
    ram_close(ram);  free(ram);
    ram_close(ram0); free(ram0);
912 913 914

    ok1(!sigaction(SIGSEGV, &saveact, NULL));

915
#undef  CHECK_MRU
916 917
#undef  CHECK_PAGE
#undef  CHECK_NOPAGE
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#undef  CHECK_DIRTY
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}


/* file access via real pagefault
 *
 * this test tests that SIGSEGV pagefault handler works and only that. Most of
 * virtual memory behaviour is more explicitly tested in
 * test_file_access_synthetic().
 */
void test_file_access_pagefault()
{
    RAM *ram;
    BigFileH fh_struct, *fh = &fh_struct;
    VMA vma_struct, *vma = &vma_struct;
    Page *page0, *page2, *page3;
    size_t PS, PSb;
    int err;

    diag("Testing file access (pagefault)");

    // XXX save/restore sigaction ?
    ok1(!pagefault_init());

    ram = ram_new(NULL,NULL);
    ok1(ram);
    PS = ram->pagesize;
    PSb = PS / sizeof(blk_t);   /* page size in blk_t units */

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/* implicitly use ram=ram */
#define CHECK_MRU(...)  __CHECK_MRU(ram, __VA_ARGS__)

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    /* ensure we are starting from new ram */
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    CHECK_MRU(/*empty*/);
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    /* setup id file */
    BigFileIdentity fileid = {
        .blksize    = ram->pagesize,    /* artificially blksize = pagesize */
        .file_ops   = &fileid_ops,
    };

    err = fileh_open(fh, &fileid, ram);
    ok1(!err);

/* implicitly use fileh=fh */
#define CHECK_PAGE(page, pgoffset, pgstate, pgrefcnt)   \
                __CHECK_PAGE(page, fh, pgoffset, pgstate, pgrefcnt)
#define CHECK_NOPAGE(pgoffset)  __CHECK_NOPAGE(fh, pgoffset)
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#define CHECK_DIRTY(...)        __CHECK_DIRTY(fh, __VA_ARGS__)
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    err = fileh_mmap(vma, fh, 100, 4);
    ok1(!err);

    /* all pages initially unmapped */
    ok1(!M(vma, 0));    CHECK_NOPAGE(       100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(       101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(       102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(       103                      );

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    CHECK_MRU(/*empty*/);
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    /* read page[0] */
    ok1(B(vma, 0*PSb) == 100);

    page0 = pagemap_get(&fh->pagemap, 100);
    ok1( M(vma, 0));    CHECK_PAGE  (page0, 100,    PAGE_LOADED,    1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(       101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(       102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(       103                      );

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    CHECK_MRU(page0);
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    /* write to page[2] */
    B(vma, 2*PSb) = 12;

    page2 = pagemap_get(&fh->pagemap, 102);
    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_LOADED,    1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

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    CHECK_MRU(page2, page0);
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    /* read page[3] */
    ok1(B(vma, 3*PSb) == 103);

    page3 = pagemap_get(&fh->pagemap, 103);
    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_LOADED,    1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1( M(vma, 3));    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    1);

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    CHECK_MRU(page3, page2, page0);
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    /* write to page[0] */
    B(vma, 0*PSb) = 10;

    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                       );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1( M(vma, 3));    CHECK_PAGE  (page3,   103,    PAGE_LOADED,    1);

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    CHECK_MRU(page0, page3, page2);    /* page0 became MRU */
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    /* unmap vma */
    vma_unmap(vma);


    /* free resources */
    fileh_close(fh);
    // ok1(list_empty(&ram->lru_list));
    ram_close(ram);
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    free(ram);
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#undef  CHECK_MRU
#undef  CHECK_PAGE
#undef  CHECK_NOPAGE
#undef  CHECK_DIRTY
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}


/*
 * test that pagefault saves/restores thread state correctly
 */

void test_pagefault_savestate()
{
    RAM *ram;
    BigFileH fh_struct, *fh = &fh_struct;
    VMA vma_struct, *vma = &vma_struct;
    int err;

    diag("Testing how pagefault handler saves/restores thread state");

    // XXX save/restore sigaction ?
    ok1(!pagefault_init());

    ram = ram_new(NULL,NULL);
    ok1(ram);

    /* setup bad file */
    volatile int loadblk_run;
    int badfile_loadblk(BigFile *file, blk_t blk, void *buf)
    {
        /* we are bad file - just say everything is ok... */

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        /* and before that corrupt thread state - to verify that pagefault handler
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         * will restore it. */
        errno = 98;
        /* Also tell we were here via, so that the test can be sure we actually
         * tried to make things go bad. */
        loadblk_run = 1;

        return 0;
    }

    const struct bigfile_ops badfile_ops = {
        .loadblk    = badfile_loadblk,
    };

    BigFile f = {
        .blksize    = ram->pagesize,    /* artificial */
        .file_ops   = &badfile_ops,
    };

    err = fileh_open(fh, &f, ram);
    ok1(!err);

    err = fileh_mmap(vma, fh, 0, 1);
    ok1(!err);

    /* before we touched anything */
    errno = 1;
    loadblk_run = 0;
    ok1(errno == 1);
    ok1(!loadblk_run);

    /* read page[0] - it should trigger badfile_loadblk() */
    ok1(B(vma, 0) == 0);

    ok1(loadblk_run);
    ok1(errno == 1);


    /* free resources */
    vma_unmap(vma);
    fileh_close(fh);
    ram_close(ram);
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    free(ram);
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}

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/* ---------------------------------------- */

/* test access to file mappings with file having .mmap* instead of .loadblk
 *
 * mmapbase is virtmem mode used with wcfs: RAM pages are used only for dirtied
 * data and everything else comes as read-only mmap from wcfs file.
 */

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/* BigFileMMap is BigFile that mmaps blkdata for read from a regular file.
 *
 * Store, contrary to load, is done via regular file writes. */
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struct BigFileMMap {
    BigFile;
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    int fd;         /* fd of file to mmap */
    int nstoreblk;  /* number of times storeblk called */
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};
typedef struct BigFileMMap BigFileMMap;

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void mmapfile_release(BigFile *file) {
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    BigFileMMap *f = upcast(BigFileMMap*, file);
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    int err;
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    err = close(f->fd);
    BUG_ON(err);
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}

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int mmapfile_storeblk(BigFile *file, blk_t blk, const void *buf) {
    BigFileMMap *f = upcast(BigFileMMap*, file);
    size_t n = f->blksize;
    off_t at = blk*f->blksize;

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    f->nstoreblk++;

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    while (n > 0) {
        ssize_t wrote;
        wrote = pwrite(f->fd, buf, n, at);
        if (wrote == -1)
            return -1;

        BUG_ON(wrote > n);
        n -= wrote;
        buf += wrote;
    }

    return 0;
}

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void *mmapfile_mmap_setup_read(BigFile *file, blk_t blk, size_t blklen, VMA *vma) {
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    BigFileMMap *f = upcast(BigFileMMap*, file);
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    void *addr;
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    addr = mmap(NULL, blklen*f->blksize, PROT_READ, MAP_SHARED, f->fd, blk*f->blksize);
    if (addr == MAP_FAILED)
        addr = NULL;

    return addr;
}

int mmapfile_remmap_blk_read(BigFile *file, blk_t blk, VMA *vma) {
    BigFileMMap *f = upcast(BigFileMMap*, file);
    TODO (f->blksize != vma->fileh->ramh->ram->pagesize);
    ASSERT(vma->f_pgoffset <= blk && blk < vma_addr_fpgoffset(vma, vma->addr_stop));
    pgoff_t pgoff_invma = blk - vma->f_pgoffset;
    uintptr_t addr = vma->addr_start + pgoff_invma*f->blksize;
    void *mapped;

    mapped = mmap((void *)addr, 1*f->blksize, PROT_READ, MAP_SHARED | MAP_FIXED, f->fd, blk*f->blksize);
    if (mapped == MAP_FAILED)
        return -1;

    ASSERT(mapped == (void *)addr);
    return 0;
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}

static const struct bigfile_ops mmapfile_ops = {
    .loadblk            = NULL,
    .mmap_setup_read    = mmapfile_mmap_setup_read,
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    .remmap_blk_read    = mmapfile_remmap_blk_read,
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    .storeblk           = mmapfile_storeblk,
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    .release            = mmapfile_release,
};


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/* verify virtmem behaviour when it is given BigFile with .mmap_* to handle data load. */
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void test_file_access_mmapbase(void)
{
    RAM *ram;
    BigFileH fh_struct, *fh = &fh_struct;
    VMA vma_struct, *vma = &vma_struct;
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    VMA vma2_struct, *vma2 = &vma2_struct;
    Page *page0, *page2, *page3;
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    blk_t *b0, *b2;
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    size_t PS, PSb;
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    int fd, err;

    diag("Testing file access (mmap base)");

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    // XXX save/restore sigaction ?
    ok1(!pagefault_init());

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    ram = ram_new(NULL, NULL);
    ok1(ram);
    PS = ram->pagesize;
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    PSb = PS / sizeof(blk_t);   /* page size in blk_t units */
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/* implicitly use ram=ram */
#define CHECK_MRU(...)  __CHECK_MRU(ram, __VA_ARGS__)

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    /* ensure we are starting from new ram */
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    CHECK_MRU(/*empty*/);
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    /* setup mmaped file */
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    char path[] = "/tmp/bigfile_mmap.XXXXXX";
    fd = mkstemp(path);
    ok1(fd != -1);
    err = unlink(path);
    ok1(!err);

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    BigFileMMap file = {
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        .blksize    = ram->pagesize,    /* artificially blksize = pagesize */
        .file_ops   = &mmapfile_ops,
        .fd         = fd,
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        .nstoreblk  = 0,
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    };

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    /* fstore stores data into file[blk] */
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    void fstore(blk_t blk, blk_t data) {
        blk_t *buf;
        int i;
        buf = malloc(file.blksize);
        BUG_ON(!buf);
        for (i=0; i < file.blksize/sizeof(*buf); i++)
            buf[i] = data;
        err = file.file_ops->storeblk(&file, blk, buf);
        BUG_ON(err);
        free(buf);
    }

    /* initialize file[100 +4) */
    fstore(100, 100);
    fstore(101, 101);
    fstore(102, 102);
    fstore(103, 103);


    err = fileh_open(fh, &file, ram);
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    ok1(!err);

/* implicitly use fileh=fh */
#define CHECK_PAGE(page, pgoffset, pgstate, pgrefcnt)   \
                __CHECK_PAGE(page, fh, pgoffset, pgstate, pgrefcnt)
#define CHECK_NOPAGE(pgoffset)  __CHECK_NOPAGE(fh, pgoffset)
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#define CHECK_DIRTY(...)        __CHECK_DIRTY(fh, __VA_ARGS__)
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    err = fileh_mmap(vma, fh, 100, 4);
    ok1(!err);

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    ok1(fh->mmaps.next == &vma->same_fileh);
    ok1(vma->same_fileh.next == &fh->mmaps);

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    /* all pages initially unmapped */
    ok1(!M(vma, 0));    CHECK_NOPAGE(       100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(       101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(       102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(       103                      );

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    CHECK_MRU   (/*empty*/);
    CHECK_DIRTY (/*empty*/);
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    /* read page[0] - served from base mmap and no RAM page is loaded */
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    ok1(B(vma, 0*PSb + 0) == 100);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);
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    ok1(!M(vma, 0));    CHECK_NOPAGE(       100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(       101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(       102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(       103                      );
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    CHECK_MRU   (/*empty*/);
    CHECK_DIRTY (/*empty*/);
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    /* write to page[2] - page2 is copy-on-write created in RAM */
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    B(vma, 2*PSb) = 12;

    page2 = pagemap_get(&fh->pagemap, 102);
    ok1(!M(vma, 0));    CHECK_NOPAGE(         100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

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    ok1(B(vma, 2*PSb + 0) ==  12); /* set by write */
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);

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    CHECK_MRU   (page2);
    CHECK_DIRTY (page2);
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    /* read page[3] - served from base mmap */
    ok1(B(vma, 3*PSb + 0) == 103);
    ok1(B(vma, 3*PSb + 1) == 103);
    ok1(B(vma, 3*PSb + PSb - 1) == 103);

    ok1(!M(vma, 0));    CHECK_NOPAGE(         100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

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    CHECK_MRU   (page2);
    CHECK_DIRTY (page2);
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    /* write to page[0] - page COW'ed into RAM */
    B(vma, 0*PSb) = 10;

    page0 = pagemap_get(&fh->pagemap, 100);
    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

    ok1(B(vma, 0*PSb + 0) ==  10); /* set by write */
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);

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    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);

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    /* unmap vma - dirty pages should stay in fh->pagemap and memory should
     * not be forgotten */
    diag("vma_unmap");
    vma_unmap(vma);

    ok1(list_empty(&fh->mmaps));

    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         101                      );
    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     0);
    CHECK_NOPAGE(         103                      );

    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);

    b0 = page_mmap(page0, NULL, PROT_READ); ok1(b0);
    b2 = page_mmap(page2, NULL, PROT_READ); ok1(b2);

    ok1(b0[0] ==  10);
    ok1(b0[1] == 100);
    ok1(b0[PSb - 1] == 100);
    ok1(b2[0] ==  12);
    ok1(b2[1] == 102);
    ok1(b2[PSb - 1] == 102);

    xmunmap(b0, PS);
    xmunmap(b2, PS);

    // XXX verify notify_munmap was correctly called

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    /* map vma back - dirty pages should be there _and_ mapped to vma.
     * (this differs from !wcfs case which does not mmap dirty pages until access) */
    diag("vma mmap again");
    err = fileh_mmap(vma, fh, 100, 4);
    ok1(!err);

    ok1(fh->mmaps.next == &vma->same_fileh);
    ok1(vma->same_fileh.next == &fh->mmaps);

    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);

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    /* dirtying a page in one mapping should automatically mmap the dirty page
     * in all other wcfs mappings */
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    diag("dirty page in vma2 -> dirties vma1");
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    err = fileh_mmap(vma2, fh, 100, 4);
    ok1(!err);

    ok1(fh->mmaps.next == &vma->same_fileh);
    ok1(vma->same_fileh.next == &vma2->same_fileh);
    ok1(vma2->same_fileh.next == &fh->mmaps);

    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     2);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     2);
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

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    ok1( M(vma2, 0));
    ok1(!M(vma2, 1));
    ok1( M(vma2, 2));
    ok1(!M(vma2, 3));
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    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page0, page2);

    B(vma2, 3*PSb) = 13;    /* write to page[3] via vma2 */

    page3 = pagemap_get(&fh->pagemap, 103);
    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     2);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     2);
    ok1( M(vma, 3));    CHECK_PAGE  (page3,   103,    PAGE_DIRTY,     2);

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    ok1( M(vma2, 0));
    ok1(!M(vma2, 1));
    ok1( M(vma2, 2));
    ok1( M(vma2, 3));
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    ok1(B(vma,  3*PSb + 0) ==  13); /* set by write */
    ok1(B(vma,  3*PSb + 1) == 103);
    ok1(B(vma,  3*PSb + PSb - 1) == 103);

    ok1(B(vma2, 3*PSb + 0) ==  13); /* set by write */
    ok1(B(vma2, 3*PSb + 1) == 103);
    ok1(B(vma2, 3*PSb + PSb - 1) == 103);

    CHECK_MRU   (page3, page0, page2);
    CHECK_DIRTY (page3, page0, page2);

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    /* unmap vma2 */
    diag("unmap vma2");
    vma_unmap(vma2);

    ok1(fh->mmaps.next == &vma->same_fileh);
    ok1(vma->same_fileh.next == &fh->mmaps);

    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1( M(vma, 2));    CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     1);
    ok1( M(vma, 3));    CHECK_PAGE  (page3,   103,    PAGE_DIRTY,     1);

    CHECK_MRU   (page3, page0, page2);
    CHECK_DIRTY (page3, page0, page2);
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    /* discard - changes should go away */
    diag("discard");
    fileh_dirty_discard(fh);

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    CHECK_NOPAGE(         100                      );

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    ok1(!M(vma, 0));    CHECK_NOPAGE(         100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(         102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );
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    CHECK_MRU   (/*empty*/);
    CHECK_DIRTY (/*empty*/);

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    /* discarded pages should read from base layer again */
    ok1(B(vma, 0*PSb + 0) == 100);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);

    ok1(B(vma, 2*PSb + 0) == 102);
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);

    ok1(B(vma, 3*PSb + 0) == 103);
    ok1(B(vma, 3*PSb + 1) == 103);
    ok1(B(vma, 3*PSb + PSb - 1) == 103);

    ok1(!M(vma, 0));    CHECK_NOPAGE(         100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(         102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(         103                      );

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    /* writeout in 3 variants - STORE, MARK, STORE+MARK */
    diag("writeout");
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    /* mkdirty2 prepares state with 2 dirty pages only 1 of which is mapped */
    void mkdirty2(int gen) {
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        vma_unmap(vma);
        CHECK_NOPAGE(         100                      );
        CHECK_NOPAGE(         101                      );
        CHECK_NOPAGE(         102                      );
        CHECK_NOPAGE(         103                      );
        page0 = page2 = page3 = NULL;

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        err = fileh_mmap(vma, fh, 100, 4);
        ok1(!err);

        B(vma, 2*PSb) = gen + 2;
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        B(vma, 0*PSb) = gen + 0;
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        vma_unmap(vma);
        page0 = pagemap_get(&fh->pagemap, 100); ok1(page0);
        page2 = pagemap_get(&fh->pagemap, 102); ok1(page2);

        err = fileh_mmap(vma, fh, 100, 2); /* note - only 2 pages */
        ok1(!err);

        ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
        ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
                            CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     0);
                            CHECK_NOPAGE(         103                      );
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        CHECK_MRU   (page0, page2);
        CHECK_DIRTY (page0, page2);
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    }
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    diag("writeout (store)");
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    mkdirty2(10);
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    file.nstoreblk = 0;
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    ok1(!fileh_dirty_writeout(fh, WRITEOUT_STORE));
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    ok1(file.nstoreblk == 2);
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    ok1( M(vma, 0));    CHECK_PAGE  (page0,   100,    PAGE_DIRTY,     1);
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
                        CHECK_PAGE  (page2,   102,    PAGE_DIRTY,     0);
                        CHECK_NOPAGE(         103                      );

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    CHECK_MRU   (page0, page2);
    CHECK_DIRTY (page2, page0); /* note becomes sorted by f_pgoffset */
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    ok1(B(vma, 0*PSb + 0) ==  10);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);

    b0 = page_mmap(page0, NULL, PROT_READ); ok1(b0);
    b2 = page_mmap(page2, NULL, PROT_READ); ok1(b2);

    ok1(b0[0] ==  10);
    ok1(b0[1] == 100);
    ok1(b0[PSb - 1] == 100);
    ok1(b2[0] ==  12);
    ok1(b2[1] == 102);
    ok1(b2[PSb - 1] == 102);

    xmunmap(b0, PS);
    xmunmap(b2, PS);
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    diag("writeout (mark)");
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    file.nstoreblk = 0;
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    ok1(!fileh_dirty_writeout(fh, WRITEOUT_MARKSTORED));
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    ok1(file.nstoreblk == 0);

    ok1(!M(vma, 0));    CHECK_NOPAGE(         100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(         101                      );
                        CHECK_NOPAGE(         102                      );
                        CHECK_NOPAGE(         103                      );

    CHECK_MRU   (/*empty*/);
    CHECK_DIRTY (/*empty*/);

    vma_unmap(vma);
    err = fileh_mmap(vma, fh, 100, 4);

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    /* data saved; served from base layer */
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    ok1(B(vma, 0*PSb + 0) ==  10);
    ok1(B(vma, 0*PSb + 1) == 100);
    ok1(B(vma, 0*PSb + PSb - 1) == 100);

    ok1(B(vma, 2*PSb + 0) ==  12);
    ok1(B(vma, 2*PSb + 1) == 102);
    ok1(B(vma, 2*PSb + PSb - 1) == 102);

    ok1(!M(vma, 0));    CHECK_NOPAGE(       100                      );
    ok1(!M(vma, 1));    CHECK_NOPAGE(       101                      );
    ok1(!M(vma, 2));    CHECK_NOPAGE(       102                      );
    ok1(!M(vma, 3));    CHECK_NOPAGE(       103                      );
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    // XXX invalidation ?
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    // XXX fileh close

    /* free resources */
    ram_close(ram);
    free(ram);
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#undef  CHECK_MRU
#undef  CHECK_PAGE
#undef  CHECK_NOPAGE
#undef  CHECK_DIRTY
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}
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// TODO test for loadblk that returns -1

int main()
{
    tap_fail_callback = abort;  // XXX to catch failure immediately

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  if (0) {
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    test_vmamap();
    test_file_access_synthetic();
    test_file_access_pagefault();
    test_pagefault_savestate();
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  }
    test_file_access_mmapbase();
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    return 0;
}