Test whether SEEK_HOLE and SEEK_DATA works correctly with offsets over
4GB, 8TB, and 16TB.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
src/seek_sanity_test.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 78 insertions(+)
diff --git a/src/seek_sanity_test.c b/src/seek_sanity_test.c
index 748eec2..cd3b1ee 100644
--- a/src/seek_sanity_test.c
+++ b/src/seek_sanity_test.c
@@ -18,6 +18,7 @@
*/
#define _XOPEN_SOURCE 500
+#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/vfs.h>
@@ -125,6 +126,9 @@ static ssize_t do_pwrite(int fd, const void *buf, size_t count, off_t offset)
while (count > written) {
ret = pwrite(fd, buf + written, count - written, offset + written);
if (ret < 0) {
+ /* Don't warn about too large file. It's fs dependent. */
+ if (errno == EFBIG)
+ return ret;
fprintf(stderr, " ERROR %d: Failed to write %ld "
"bytes\n", errno, (long)count);
return ret;
@@ -191,6 +195,77 @@ static int do_lseek(int testnum, int subtest, int fd, int filsz, int origin,
return ret;
}
+static int huge_file_test(int fd, int testnum, off_t filsz)
+{
+ char *buf = NULL;
+ int bufsz = alloc_size * 16; /* XFS seems to round allocated size */
+ off_t off = filsz - 2*bufsz;
+ int ret = -1;
+
+ buf = do_malloc(bufsz);
+ if (!buf)
+ goto out;
+ memset(buf, 'a', bufsz);
+
+ ret = do_pwrite(fd, buf, bufsz, 0);
+ if (ret)
+ goto out;
+ ret = do_pwrite(fd, buf, bufsz, off);
+ if (ret) {
+ /*
+ * Report success. Filesystem just cannot handle so large
+ * offsets and correctly reports it.
+ */
+ if (errno == EFBIG) {
+ fprintf(stdout, "Test skipped as fs doesn't support so large files.\n");
+ ret = 0;
+ }
+ goto out;
+ }
+
+ /* offset at the beginning */
+ ret += do_lseek(testnum, 1, fd, filsz, SEEK_HOLE, 0, bufsz);
+ ret += do_lseek(testnum, 2, fd, filsz, SEEK_HOLE, 1, bufsz);
+ ret += do_lseek(testnum, 3, fd, filsz, SEEK_DATA, 0, 0);
+ ret += do_lseek(testnum, 4, fd, filsz, SEEK_DATA, 1, 1);
+
+ /* offset around eof */
+ ret += do_lseek(testnum, 5, fd, filsz, SEEK_HOLE, off, off + bufsz);
+ ret += do_lseek(testnum, 6, fd, filsz, SEEK_DATA, off, off);
+ ret += do_lseek(testnum, 7, fd, filsz, SEEK_DATA, off + 1, off + 1);
+ ret += do_lseek(testnum, 8, fd, filsz, SEEK_DATA, off - bufsz, off);
+
+out:
+ do_free(buf);
+ return ret;
+}
+
+/*
+ * Test huge file to check for overflows of block counts due to usage of
+ * 32-bit types.
+ */
+static int test12(int fd, int testnum)
+{
+ return huge_file_test(fd, testnum,
+ ((long long)alloc_size << 32) + (1 << 20));
+}
+
+/*
+ * Test huge file to check for overflows of block counts due to usage of
+ * signed types
+ */
+static int test11(int fd, int testnum)
+{
+ return huge_file_test(fd, testnum,
+ ((long long)alloc_size << 31) + (1 << 20));
+}
+
+/* Test an 8G file to check for offset overflows at 1 << 32 */
+static int test10(int fd, int testnum)
+{
+ return huge_file_test(fd, testnum, 8ULL << 30);
+}
+
/*
* test file with unwritten extents, have both dirty and
* writeback pages in page cache.
@@ -577,6 +652,9 @@ struct testrec seek_tests[] = {
{ 7, test07, "Test file with unwritten extents, only have dirty pages" },
{ 8, test08, "Test file with unwritten extents, only have unwritten pages" },
{ 9, test09, "Test file with unwritten extents, have both dirty && unwritten pages" },
+ { 10, test10, "Test a huge file for offset overflow" },
+ { 11, test11, "Test a huge file for block number signed" },
+ { 12, test12, "Test a huge file for block number overflow" },
};
static int run_test(struct testrec *tr)
--
1.8.1.4
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