Test whether SEEK_HOLE and SEEK_DATA works correctly with offsets over
4GB.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
src/seek_sanity_test.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/src/seek_sanity_test.c b/src/seek_sanity_test.c
index 7d5868b..55e7ed6 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>
@@ -191,6 +192,42 @@ static int do_lseek(int testnum, int subtest, int fd, int filsz, int origin,
return ret;
}
+/* test a huge file to check for 4G overflows */
+static int test10(int fd, int testnum)
+{
+ char *buf = NULL;
+ int bufsz = alloc_size;
+ off_t filsz = 8ULL << 30; /* 8G */
+ 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)
+ 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);
+
+out:
+ do_free(buf);
+ return ret;
+}
/*
* test file with unwritten extents, have both dirty and
* writeback pages in page cache.
@@ -577,6 +614,7 @@ 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" },
};
static int run_test(struct testrec *tr)
--
1.8.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
