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Date: Fri, 31 May 2013 10:41:55 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: Jan Kara <jack@...e.cz>
CC: xfs@....sgi.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3 v2] 285: Test offsets over 4GB
On 5/30/13 4:21 PM, Jan Kara wrote:
> Test whether SEEK_HOLE and SEEK_DATA works correctly with offsets over
> 4GB, 8TB, and 16TB.
>
> Signed-off-by: Jan Kara <jack@...e.cz>
Looks fine
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
fallocate makes ext3 fail for similar reasons, will send a similar patch
to fix that up.
> ---
> 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)
>
--
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