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#include "metadisp.h"
#include <glusterfs/call-stub.h>
/**
* The stat flow in METADISP is complicated because we must
* do ensure a few things:
* 1. stat, on the path within the metadata layer,
* MUST get the backend FD of the data layer.
* --- we wind to the metadata layer, then the data layer.
*
* 2. the metadata layer MUST be able to ask the data
* layer for stat information.
* --- this is 'syncop-internal-from-posix'
*
* 3. when the metadata exists BUT the data is missing,
* we MUST mark the backend file as bad and heal it.
*/
int32_t
metadisp_stat_backend_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, struct iatt *buf,
dict_t *xdata)
{
METADISP_TRACE("got backend stat results %d %d", op_ret, op_errno);
if (op_errno == ENOENT) {
STACK_UNWIND_STRICT(open, frame, -1, ENODATA, NULL, NULL);
return 0;
}
STACK_UNWIND_STRICT(stat, frame, op_ret, op_errno, buf, xdata);
return 0;
}
int32_t
metadisp_stat_resume(call_frame_t *frame, xlator_t *this, loc_t *loc,
dict_t *xdata)
{
METADISP_TRACE("winding stat to path %s", loc->path);
if (gf_uuid_is_null(loc->gfid)) {
METADISP_TRACE("bad object, sending EUCLEAN");
STACK_UNWIND_STRICT(open, frame, -1, EUCLEAN, NULL, NULL);
return 0;
}
STACK_WIND(frame, metadisp_stat_backend_cbk, SECOND_CHILD(this),
SECOND_CHILD(this)->fops->stat, loc, xdata);
return 0;
}
int32_t
metadisp_stat_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, struct iatt *buf,
dict_t *xdata)
{
call_stub_t *stub = NULL;
METADISP_TRACE("got stat results %d %d", op_ret, op_errno);
if (cookie) {
stub = cookie;
}
if (op_ret != 0) {
goto unwind;
}
// only use the stub for the files
if (!IA_ISREG(buf->ia_type)) {
goto unwind;
}
if (stub->poison) {
call_stub_destroy(stub);
stub = NULL;
return 0;
}
call_resume(stub);
return 0;
unwind:
if (stub) {
call_stub_destroy(stub);
}
STACK_UNWIND_STRICT(stat, frame, op_ret, op_errno, buf, xdata);
return 0;
}
int32_t
metadisp_stat(call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
{
call_stub_t *stub = NULL;
int32_t ret = 0;
loc_t backend_loc = {
0,
};
METADISP_FILTER_ROOT(stat, loc, xdata);
if (build_backend_loc(loc->gfid, loc, &backend_loc)) {
goto unwind;
}
if (dict_get_int32(xdata, "syncop-internal-from-posix", &ret) == 0) {
// if we've just been sent a stat from posix, then we know
// that we must send down a stat for a file to the second child.
//
// that means we can skip the stat for the first child and just
// send to the data disk.
METADISP_TRACE("got syncop-internal-from-posix");
STACK_WIND(frame, default_stat_cbk, DATA_CHILD(this),
DATA_CHILD(this)->fops->stat, &backend_loc, xdata);
return 0;
}
// we do not know if the request is for a file, folder, etc. wind
// to first child to find out.
stub = fop_stat_stub(frame, metadisp_stat_resume, &backend_loc, xdata);
METADISP_TRACE("winding stat to first child %s", loc->path);
STACK_WIND_COOKIE(frame, metadisp_stat_cbk, stub, METADATA_CHILD(this),
METADATA_CHILD(this)->fops->stat, loc, xdata);
return 0;
unwind:
STACK_UNWIND_STRICT(stat, frame, -1, EINVAL, NULL, NULL);
return 0;
}
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