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kwolf@redhat.com, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/20/19 1:24 PM, Eric Blake wrote: > On 8/20/19 11:46 AM, Denis Plotnikov wrote: >> The patch allows to provide a pattern file for write >> command. There was no similar ability before. >> >> Signed-off-by: Denis Plotnikov >> --- > >> @@ -983,8 +1057,9 @@ static int write_f(BlockBackend *blk, int argc, char **argv) >> /* Some compilers get confused and warn if this is not initialized. */ >> int64_t total = 0; >> int pattern = 0xcd; >> + const char *file_name = NULL; >> >> - while ((c = getopt(argc, argv, "bcCfnpP:quz")) != -1) { >> + while ((c = getopt(argc, argv, "bcCfnpP:quzs:")) != -1) { > > This one looks odd (I would have preserved ordering by sticking s: > between q and u). But a maintainer could fix that. > >> switch (c) { >> case 'b': >> bflag = true; >> @@ -1020,6 +1095,10 @@ static int write_f(BlockBackend *blk, int argc, char **argv) >> case 'z': >> zflag = true; >> break; >> + case 's': >> + sflag = true; >> + file_name = optarg; >> + break; > > Likewise, sorting the cases in the same order as the getopt() listing > helps in finding code during later edits. > >> @@ -1088,7 +1168,14 @@ static int write_f(BlockBackend *blk, int argc, char **argv) >> } >> >> if (!zflag) { >> - buf = qemu_io_alloc(blk, count, pattern); >> + if (sflag) { >> + buf = qemu_io_alloc_from_file(blk, count, file_name); >> + if (!buf) { >> + return -EINVAL; >> + } >> + } else { >> + buf = qemu_io_alloc(blk, count, pattern); >> + } > > Pre-existing, but it is odd that qemu_io_alloc() exit()s rather than > returning NULL on huge allocation requests that can't be met. (Then > again, we have an early exit on any length > 2G, and 2G allocations tend > to succeed on modern development machines). Perhaps it would be nice to > teach qemu-io to use blk_try_blockalign for more graceful handling even > on 32-bit platforms, but that's not the problem of your patch. > > Option ordering is minor enough that I'm fine giving: > > Reviewed-by: Eric Blake > > Now, to figure out which maintainer should take it. Perhaps you want to > add a patch 2/1 that adds an iotest using this new mode, to a) ensure it > doesn't regress, and b) makes it reasonable to take in through the > iotest tree. > Yes, this is a good idea. I'm sure over time we'll pick up uses of pattern writing that will strengthen the the regression testing of the feature, but for now a simple test case will help ensure it. (It'll also help "document" how to use the feature for other test writers.) Thanks!