b42549ad69
If requested, return the actual mapping size to the caller in addition to the address. journal_file_move_to_object() often performs two successive mmap_cache_get() calls via journal_file_move_to(); one to get the object header, then another to get the entire object when it's larger than the header's size. If mmap_cache_get() returned the actual mapping's size, it's probable that the second mmap_cache_get() could be skipped when the established mapping already encompassed the desired size.
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "fd-util.h"
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#include "fileio.h"
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#include "macro.h"
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#include "mmap-cache.h"
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#include "util.h"
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int main(int argc, char *argv[]) {
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MMapFileDescriptor *fx;
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int x, y, z, r;
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char px[] = "/tmp/testmmapXXXXXXX", py[] = "/tmp/testmmapYXXXXXX", pz[] = "/tmp/testmmapZXXXXXX";
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MMapCache *m;
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void *p, *q;
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assert_se(m = mmap_cache_new());
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x = mkostemp_safe(px);
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assert_se(x >= 0);
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unlink(px);
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assert_se(fx = mmap_cache_add_fd(m, x));
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y = mkostemp_safe(py);
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assert_se(y >= 0);
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unlink(py);
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z = mkostemp_safe(pz);
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assert_se(z >= 0);
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unlink(pz);
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r = mmap_cache_get(m, fx, PROT_READ, 0, false, 1, 2, NULL, &p, NULL);
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assert_se(r >= 0);
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r = mmap_cache_get(m, fx, PROT_READ, 0, false, 2, 2, NULL, &q, NULL);
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assert_se(r >= 0);
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assert_se((uint8_t*) p + 1 == (uint8_t*) q);
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r = mmap_cache_get(m, fx, PROT_READ, 1, false, 3, 2, NULL, &q, NULL);
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assert_se(r >= 0);
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assert_se((uint8_t*) p + 2 == (uint8_t*) q);
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r = mmap_cache_get(m, fx, PROT_READ, 0, false, 16ULL*1024ULL*1024ULL, 2, NULL, &p, NULL);
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assert_se(r >= 0);
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r = mmap_cache_get(m, fx, PROT_READ, 1, false, 16ULL*1024ULL*1024ULL+1, 2, NULL, &q, NULL);
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assert_se(r >= 0);
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assert_se((uint8_t*) p + 1 == (uint8_t*) q);
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mmap_cache_free_fd(m, fx);
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mmap_cache_unref(m);
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safe_close(x);
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safe_close(y);
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safe_close(z);
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return 0;
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}
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