mmap as a popular and basic operation, most of softwares use it to
access files.
More and more customers report bugs related with mmap/munmap and
other stress conditions. So add mmap test into fsstress to reproduce
or find more bugs easily.
Signed-off-by: Zorro Lang <zlang@xxxxxxxxxx>
---
Hi,
I've tested this patch on XFS by running:
./ltp/fsstress -d /mnt/scratch -f mmap=1000 -f creat=500 -f mkdir=500 -n 2000 -p10 -v
./ltp/fsstress -d /mnt/scratch -f mmap=1000 -f dwrite=1000 -f write=1000 -f creat=500 -f mkdir=500 -n 4000 -p10 -v
./ltp/fsstress -d /mnt/scratch -n 5000 -p10 -v
I didn't find any unexpected errors. Please help to review.
I'll send another patch to LTP if this patch can be merged into xfstests.
Thanks,
Zorro
ltp/fsstress.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/global.h | 4 +++
2 files changed, 81 insertions(+)
diff --git a/ltp/fsstress.c b/ltp/fsstress.c
index 35e2765..5914551 100644
--- a/ltp/fsstress.c
+++ b/ltp/fsstress.c
@@ -2585,7 +2585,84 @@ link_f(int opno, long r)
void
mmap_f(int opno, long r)
{
+ char *addr;
+ int e;
+ pathname_t f;
+ int fd;
+ size_t len;
+ __int64_t lr;
+ off64_t off;
+ int flags;
+ struct stat64 stb;
+ int v;
+ char st[1024];
+ init_pathname(&f);
+ if (!get_fname(FT_REGFILE, r, &f, NULL, NULL, &v)) {
+ if (v)
+ printf("%d/%d: mmap - no filename\n", procid, opno);
+ free_pathname(&f);
+ return;
+ }
+ fd = open_path(&f, O_RDWR);
+ e = fd < 0 ? errno : 0;
+ check_cwd();
+ if (fd < 0) {
+ if (v)
+ printf("%d/%d: mmap - open %s failed %d\n",
+ procid, opno, f.path, e);
+ free_pathname(&f);
+ return;
+ }
+ if (fstat64(fd, &stb) < 0) {
+ if (v)
+ printf("%d/%d: write - fstat64 %s failed %d\n",
+ procid, opno, f.path, errno);
+ free_pathname(&f);
+ close(fd);
+ return;
+ }
+ inode_info(st, sizeof(st), &stb, v);
+ lr = ((__int64_t)random() << 32) + random();
+ off = (off64_t)(lr % MIN(stb.st_size + (1024 * 1024), MAXFSIZE));
+ off %= maxfsize;
+ off &= (off64_t)(~(sysconf(_SC_PAGE_SIZE) - 1));
+ len = (size_t)(random() % MIN(maxfsize - off, FILELEN_MAX)) + 1;
+
+ /*
+ * truncate file to the size we need to map and access,
+ * keep away SIGBUS / SIGSEGV killing this process
+ */
+ e = truncate64_path(&f, off + len) < 0 ? errno : 0;
+ /* try private file mappings with 20% rate */
+ flags = (random() % 20) ? MAP_SHARED : MAP_PRIVATE;
+ do {
+ addr = mmap(NULL, len, PROT_READ | PROT_WRITE, flags, fd, off);
+ e = (addr == MAP_FAILED) ? errno : 0;
+ if (errno == ENOMEM && flags & MAP_PRIVATE) {
+ /* turn to shared mapping if memeory is not enough for private mapping */
+ flags = MAP_SHARED;
+ } else if (errno == ENOMEM && len > sysconf(_SC_PAGE_SIZE)) {
+ /* reduce mapping length, if memeory is not enough for shared mapping */
+ len /= 2;
+ }
+ } while (errno == ENOMEM && len > sysconf(_SC_PAGE_SIZE));
+ if (v)
+ printf("%d/%d: mmap %s%s [%lld,%d,%s] %d\n",
+ procid, opno, f.path, st, (long long)off, (int)len,
+ (flags & MAP_PRIVATE) ? "MAP_PRIVATE" : "MAP_SHARED", e);
+
+ if (addr != MAP_FAILED) {
+ memset(addr, nameseq & 0xff, len);
+ e = munmap(addr, len) < 0 ? errno : 0;
+ if (v)
+ printf("%d/%d: munmap %s%s [%lld,%d] %d\n",
+ procid, opno, f.path, st, (long long)off,
+ (int)len, e);
+ }
+
+ free_pathname(&f);
+ close(fd);
}
void
diff --git a/src/global.h b/src/global.h
index f63246b..51d1e94 100644
--- a/src/global.h
+++ b/src/global.h
@@ -178,4 +178,8 @@
#endif /* HAVE_LINUX_FALLOC_H */
+#ifndef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
#endif /* GLOBAL_H */
--
2.7.4
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