On 5/30/13 3:01 PM, Jan Kara wrote:
> On Thu 30-05-13 08:48:24, Eric Sandeen wrote:
>> On 5/30/13 7:45 AM, Jan Kara wrote:
>>> Test whether SEEK_HOLE and SEEK_DATA works correctly with offsets over
>>> 4GB.
>>
>>
>> Hm, should we add 2T as well while we're at it?
>>
>> (and does this cause any new failures?)
> Yes, ext4 is broken. I've sent fixes for it yesterday. I'm not sure what
Argh, sorry I forgot that. I just want to be careful about more rigorous
tests making it look like we have regressions in the code.
> exactly would overflow at 2T ... block counts if signed int is used and
> blocksize is 1KB?
Hum ok, where'd I come up with 2T? :) never mind that maybe, unless
there are other potential trouble points we should add (8T? 16T for
filesystems that can handle it?)
-Eric
> Honza
>
>>> 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)
>>>
>>
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