On 2017/11/28 15:20, Eryu Guan wrote:
On Mon, Nov 27, 2017 at 10:34:27AM +0800, Xiao Yang wrote:I got the following message when running generic/465 in ext4 data=journal mode --------------------------------------------------------------- QA output created by 465 non-aio dio test encounter an error: block 0 offset 4096, content 62 encounter an error: block 0 offset 122880, content 62 encounter an error: block 0 offset 274432, content 62 encounter an error: block 0 offset 86016, content 62 aio-dio test encounter an error: block 0 offset 28672, content 62 encounter an error: block 0 offset 12288, content 62 encounter an error: block 2 offset 16384, content 62 encounter an error: block 1 offset 565248, content 62 --------------------------------------------------------------- In ext4 data=journal mode, direct read will fall back to buffer read, and buffer read doesn't take inode lock, so it doesn't need to wait for the writer to finish first and sees the intermediate inode size and returns data less than 1M. We can just check the actual read data instead of the whole read buffer. Signed-off-by: Xiao Yang<yangx.jy@xxxxxxxxxxxxxx> --- src/aio-dio-regress/aio-dio-append-write-read-race.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/src/aio-dio-regress/aio-dio-append-write-read-race.c b/src/aio-dio-regress/aio-dio-append-write-read-race.c index 8f94d50..eaec784 100644 --- a/src/aio-dio-regress/aio-dio-append-write-read-race.c +++ b/src/aio-dio-regress/aio-dio-append-write-read-race.c @@ -43,6 +43,7 @@ struct io_data { off_t offset; char *buf; int use_aio; + size_t act_sz;I think this should be a signed value, as pread returns ssize_t. And maybe rename the variable to read_sz? Otherwise looks fine to me. And I can do the updates on commit, if there's no further review comments.
Hi Eryu, Thanks for your comment, i can send v3 patch as you suggested. :-) Thanks, Xiao Yang
Thanks, Eryu}; int reader_ready = 0; @@ -57,15 +58,14 @@ static void usage(const char *prog) static void *reader(void *arg) { struct io_data *data = (struct io_data *)arg; - int ret; memset(data->buf, 'b', data->blksize); reader_ready = 1; do { - ret = pread(data->fd, data->buf, data->blksize, data->offset); - if (ret< 0) + data->act_sz = pread(data->fd, data->buf, data->blksize, data->offset); + if (data->act_sz< 0) perror("read file"); - } while (ret<= 0); + } while (data->act_sz<= 0); return NULL; } @@ -203,7 +203,7 @@ int main(int argc, char *argv[]) goto err; } - for (j = 0; j< blksize; j++) { + for (j = 0; j< rdata.act_sz; j++) { if (rdata.buf[j] != 'a') { fail("encounter an error: " "block %d offset %d, content %x\n", -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe fstests" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html.
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