Hello Gluster-Devels,
actually I am writing my first xlator according to this tutorial:
https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/translator-development.md
So I put the rot-13 Xlator and wrote my own stuff. My idea is to change the
iovec-content and put a new content in it.
My readv_cbk look like this:
int32_t
stub_iovec (xlator_t *this, struct iovec *vector, struct iobref *iobref, struct
iatt *stbuf, int count)
{
int i;
for (i = 0; i < count; i++) {
struct iobuf *iobuf = NULL;
iobuf = iobuf_get(this->ctx->iobuf_pool);
iobuf_unref(iobref->iobrefs[i]);
iobref = iobref_new();
iobref_add(iobref, iobuf);
char temp[] = "I am the manipulated content!!!\n";
char *buf0 = "I am the manipulated content!!!\n";
vector[i].iov_base = buf0;
vector[i].iov_len = sizeof(temp);
stbuf->ia_size = sizeof(temp);
return stbuf->ia_size;
}
}
int32_t
stub_readv_cbk (call_frame_t *frame,
void *cookie,
xlator_t *this,
int32_t op_ret,
int32_t op_errno,
struct iovec *vector,
int32_t count,
struct iatt *stbuf,
struct iobref *iobref, dict_t *xdata)
{
gf_log (this->name, GF_LOG_DEBUG, "Führe stub_readv_cbk aus!!!");
int32_t new_op_ret = stub_iovec(this, vector, iobref, stbuf, count);
STACK_UNWIND_STRICT (readv, frame, new_op_ret, op_errno, vector,
count,
stbuf, iobref, xdata);
return 0;
}
Ist not really working at all. If I have an original content like a simple
"orig" in a test.txt and change it to "manipulate",
the command "cat /mnt/gluster/test.txt" show me an "mani". The size if the
content did not changed.
Any idea about hat?
Regards
David
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