At Tue, 29 Oct 2013 16:25:52 +0800, Liu Yuan wrote: > > Sheepdog support two kinds of redundancy, full replication and erasure coding. > > # create a fully replicated vdi with x copies > -o redundancy=x (1 <= x <= SD_MAX_COPIES) > > # create a erasure coded vdi with x data strips and y parity strips > -o redundancy=x:y (x must be one of {2,4,8,16} and 1 <= y < SD_EC_MAX_STRIP) > > E.g, to convert a vdi into sheepdog vdi 'test' with 8:3 erasure coding scheme > > $ qemu-img convert -o redundancy=8:3 linux-0.2.img sheepdog:test > > Cc: Kevin Wolf <kw...@redhat.com> > Cc: Stefan Hajnoczi <stefa...@redhat.com> > Signed-off-by: Liu Yuan <namei.u...@gmail.com> > --- > block/sheepdog.c | 78 > ++++++++++++++++++++++++++++++++++++++++++++- > include/block/block_int.h | 1 + > 2 files changed, 78 insertions(+), 1 deletion(-) > > diff --git a/block/sheepdog.c b/block/sheepdog.c > index e66d2f8..bd7cfd6 100644 > --- a/block/sheepdog.c > +++ b/block/sheepdog.c > @@ -91,6 +91,14 @@ > #define SD_NR_VDIS (1U << 24) > #define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22) > #define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS) > +/* > + * For erasure coding, we use at most SD_EC_MAX_STRIP for data strips and > + * (SD_EC_MAX_STRIP - 1) for parity strips > + * > + * SD_MAX_COPIES is sum of number of dats trips and parity strips. > + */ > +#define SD_EC_MAX_STRIP 16 > +#define SD_MAX_COPIES (SD_EC_MAX_STRIP * 2 - 1) > > #define SD_INODE_SIZE (sizeof(SheepdogInode)) > #define CURRENT_VDI_ID 0 > @@ -1446,6 +1454,65 @@ out: > return ret; > } > > +static int64_t is_numeric(const char *s) > +{ > + char *end; > + return strtosz_suffix(s, &end, STRTOSZ_DEFSUFFIX_B); > +}
I think the type of the return value should be bool. Thanks, Kazutaka