On 6/9/16 8:41 AM, Jan Tulak wrote:
> lsunit was already tested, but lsu was not. So a thing like -l su=4097 was
> possible. This commit adds a check to fix it.
>
> Signed-off-by: Jan Tulak <jtulak@xxxxxxxxxx>
> ---
> mkfs/xfs_mkfs.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
> index 455bf11..b9b50fe 100644
> --- a/mkfs/xfs_mkfs.c
> +++ b/mkfs/xfs_mkfs.c
> @@ -2875,6 +2875,15 @@ an AG size that is one stripe unit smaller, for example %llu.\n"),
> lsunit = dsunit;
> }
>
> + if (lsu) {
> + if (lsu % blocksize != 0) {
> + fprintf(stderr,
> + _("log stripe unit (%d) must be a multiple of the block size (%d)\n"),
> + lsu, blocksize);
> + exit(1);
> + }
> + }
> +
Hm, I'm not quite seeing the behavior you say you're fixing;
you give the example of -l su=4097, but:
# mkfs/mkfs.xfs -f -dfile,name=fsfile,size=128m -l su=4097
Illegal value 4097 for -l su option. value is too small
So that's really not the relevant test case.
And in these cases it is caught and does fail:
# mkfs/mkfs.xfs -f -dfile,name=fsfile,size=128m -l su=63k
log stripe unit (64512) must be a multiple of the block size (4096)
# mkfs/mkfs.xfs -f -dfile,name=fsfile,size=128m -l su=64512
log stripe unit (64512) must be a multiple of the block size (4096)
But in this case it does not:
# mkfs/mkfs.xfs -f -dfile,name=fsfile,size=128m -l su=16385
meta-data=fsfile isize=512 agcount=4, agsize=8192 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=0
data = bsize=4096 blocks=32768, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=552, version=2
= sectsz=512 sunit=4 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
So what's going on here...? It has something to do with how
calc_stripe_factors() operates, and when that happens vs. the checks.
lsu and lsunit are really specifying the same thing, just in different
units.
Your patch does fix it up, but I wonder if these tests are in the
wrong place; with your patch we essentially do this:
1) Parse lsu value
2) Convert lsu to lsunit
3) Check lsunit (it's ok)
4) Go back and check lsu (it's not ok)
It seems to me that we should recognize either lsu or lsunit
as the "one true value" and convert the other to it as soon as possible,
rather than carrying around both, and checking both at various times.
calc_stripe_factors() does do some validity checks; perhaps it should
check against blocksize multiples as well, so it's all in one place?
And a comment about what that function is doing (converting su's to
sunit's, really) would be helpful.
What do you think?
Your patch does resolve the problem but I think it adds a little more
confusion to already confusing code.
-Eric
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