#include <math.h>
#include <string.h>
+#define PRINT_SIG(__who, __sig) \
+ printf("%s (%lu): id %lu, object %lu, offset %lu\n", \
+ #__who, (uint64_t)(__sig), \
+ ((struct signature *)__sig)->id, \
+ ((struct signature *)__sig)->object, \
+ ((struct signature *)__sig)->offset);
+
/******************************\
* Static miscellaneous tools *
\******************************/
return new / (prefs->os / prefs->bs);
}
+static inline int _snap_to_bound8(uint64_t space)
+{
+ return space > 8 ? 8 : space;
+}
+
static inline double timespec2double(struct timespec num)
{
return (double) (num.tv_sec * pow(10, 9) + num.tv_nsec);
}
+static inline void write_sig(struct bench_lfsr *sg, uint64_t *d, uint64_t s,
+ int pos)
+{
+ uint64_t i;
+ uint64_t last_val;
+ uint64_t space_left;
+
+ /* Write random numbers (based on global_id) every 24 bytes */
+ /* TODO: Should we use memcpy? */
+ for (i = pos; i < s - (3 - pos); i += 3)
+ *(d + i) = lfsr_next(sg);
+
+ /* special care for last chunk */
+ last_val = lfsr_next(sg);
+ space_left = s - (i * 8);
+ memcpy(d + i, &last_val, _snap_to_bound8(space_left));
+}
+
+static inline int read_sig(struct bench_lfsr *sg, uint64_t *d, uint64_t s,
+ int pos)
+{
+ uint64_t i;
+ uint64_t last_val;
+ uint64_t space_left;
+
+ /* TODO: Should we use memcmp? */
+ for (i = pos; i < s - (3 - pos); i += 3) {
+ if (*(d + i) != lfsr_next(sg))
+ return 1;
+ }
+ /* special care for last chunk */
+ last_val = lfsr_next(sg);
+ space_left = s - (i * 8);
+ if (memcmp(d + i, &last_val, _snap_to_bound8(space_left)))
+ return 1;
+
+ return 0;
+}
+
/*
* Seperates a double number in seconds, msec, usec, nsec
* Expects a number in nanoseconds (e.g. a number from timespec2double)
XSEGLOG2(&lc, D, "Target name of request is %s\n", req_target);
}
-void create_chunk(struct bench *prefs, struct xseg_request *req, uint64_t new)
-{
- struct xseg *xseg = prefs->peer->xseg;
- void *req_data;
- uint64_t id;
- uint64_t object;
- struct bench_lfsr id_lfsr, obj_lfsr, off_lfsr;
- uint64_t i;
uint64_t determine_next(struct bench *prefs)
{
return lfsr_next(prefs->lfsr);
}
- id = _get_id();
- object = _get_object(prefs, new);
+/*
+ * ***********************************************
+ * `create_chunk` handles 3 identifiers:
+ * 1. The benchmark's global_id
+ * 2. The object's number
+ * 3. The chunk offset in the object
+ *
+ * ************************************************
+ * `_create_chunk_full` takes the above 3 identifiers and feeds them as seeds
+ * in 63-bit LFSRs. The numbers generated are written consecutively in chunk's
+ * memory range. For example, for a 72-byte chunk:
+ *
+ * || 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 ||
+ * ^ 8 16 24 32 40 48 56 64 ^
+ * | |
+ * | |
+ * start end
+ *
+ * 1,2,3 differ between each iteration
+ *
+ * **************************************************
+ * `_create_chunk_meta` simply writes the above 3 ids in the start and end of
+ * the chunk's memory range, so it should be much faster (but less safe)
+ *
+ * **************************************************
+ * In both cases, special care is taken not to exceed the chunk's memory range.
+ * Also, the bare minimum chunk to verify should be 48 bytes. This limit is set
+ * by _create_chunk_meta, which expects to write in a memory at least this big.
+ */
+static int _readwrite_chunk_full(struct xseg *xseg, struct xseg_request *req,
+ uint64_t id, uint64_t object)
+{
+ struct bench_lfsr id_lfsr;
+ struct bench_lfsr obj_lfsr;
+ struct bench_lfsr off_lfsr;
+ uint64_t *d = (uint64_t *)xseg_get_data(xseg, req);
+ uint64_t s = req->size;
+
+ /* Create 63-bit LFSRs */
+ lfsr_init(&id_lfsr, 0x7FFFFFFF, id, 0);
+ lfsr_init(&obj_lfsr, 0x7FFFFFFF, object, 0);
+ lfsr_init(&off_lfsr, 0x7FFFFFFF, req->offset, 0);
+
+ if (s < sizeof(struct signature)) {
+ XSEGLOG2(&lc, E, "Too small chunk size (%lu butes). Leaving.", s);
+ return 1;
+ }
- req_data = xseg_get_data(xseg, req);
+ /*
+ * Every write operation has its read counterpart which, if it finds any
+ * corruption, returns 1
+ */
+
+ if (req->op == X_WRITE) {
+ write_sig(&id_lfsr, d, s, 1);
+ write_sig(&obj_lfsr, d, s, 2);
+ write_sig(&off_lfsr, d, s, 3);
+ } else {
+ if (read_sig(&id_lfsr, d, s, 1))
+ return 1;
+ if (read_sig(&obj_lfsr, d, s, 2))
+ return 1;
+ if(read_sig(&off_lfsr, d, s, 3))
+ return 1;
+ }
- lfsr_init(&id_lfsr, 0xFFFFFFFF, id, 0);
- lfsr_init(&obj_lfsr, 0xFFFFFFFF, object, 0);
- lfsr_init(&off_lfsr, 0xFFFFFFFF, req->offset, 0);
+ return 0;
+}
- for (i = 0; i < req->size; i += 192) {
- /*
- * lfsr-next
- * copy to memory
- */
+static int _readwrite_chunk_meta(struct xseg *xseg, struct xseg_request *req,
+ uint64_t id, uint64_t object)
+{
+ char *d = xseg_get_data(xseg, req);
+ uint64_t s = req->size;
+ struct signature sig;
+ int sig_s = sizeof(struct signature);
+ int r = 0;
+
+ sig.id = id;
+ sig.object = object;
+ sig.offset = req->offset;
+
+ if (s < sig_s) {
+ XSEGLOG2(&lc, E, "Too small chunk size (%lu butes). Leaving.", s);
+ return 1;
}
- /* check for left-overs chunk */
- for (i = 64; i < req->size; i += 192) {
- /*
- * lfsr-next
- * copy to memory
- */
+ //PRINT_SIG(expected, (&sig));
+ /* Read/Write chunk signature both at its start and at its end */
+ if (req->op == X_WRITE) {
+ memcpy(d, &sig, sig_s);
+ memcpy(d + s - sig_s, &sig, sig_s);
+ } else {
+ if (memcmp(d, &sig, sig_s))
+ r = 1;
+ else if (memcmp(d + s - sig_s, &sig, sig_s))
+ r = 1;
}
- /* check for left-overs chunk */
+ //PRINT_SIG(start, d);
+ //PRINT_SIG(end, (d + s - sig_s));
+ return r;
+}
+
+/*
+ * We want these functions to be as fast as possible in case we haven't asked
+ * for verification
+ * TODO: Make them prettier but keep the speed of this implementation
+ */
+void create_chunk(struct bench *prefs, struct xseg_request *req, uint64_t new)
+{
+ struct xseg *xseg = prefs->peer->xseg;
+ uint64_t id;
+ uint64_t object;
+ int verify;
- for (i = 128; i < req->size; i += 192) {
- /*
- * lfsr-next
- * copy to memory
- */
+ verify = GET_FLAG(VERIFY, prefs->flags);
+ switch (verify) {
+ case VERIFY_NO:
+ break;
+ case VERIFY_META:
+ id = _get_id();
+ object = _get_object(prefs, new);
+ _readwrite_chunk_meta(xseg, req, id, object);
+ break;
+ case VERIFY_FULL:
+ id = _get_id();
+ object = _get_object(prefs, new);
+ _readwrite_chunk_full(xseg, req, id, object);
+ break;
+ default:
+ XSEGLOG2(&lc, W, "Unexpected verification mode: %d\n", verify);
}
- /* check for left-overs chunk */
}
int read_chunk(struct bench *prefs, struct xseg_request *req)
{
- if ((prefs->flags & (1 << PATTERN_FLAG)) == IO_SEQ)
- return prefs->sub_tm->completed;
- else {
- return lfsr_next(prefs->lfsr);
+ struct xseg *xseg = prefs->peer->xseg;
+ uint64_t id;
+ uint64_t object;
+ char *target;
+ int verify;
+ int r = 0;
+
+ verify = GET_FLAG(VERIFY, prefs->flags);
+ switch (verify) {
+ case VERIFY_NO:
+ break;
+ case VERIFY_META:
+ id = _get_id();
+ target = xseg_get_target(xseg, req);
+ object = _get_object_from_name(target);
+ r = _readwrite_chunk_meta(xseg, req, id, object);
+ break;
+ case VERIFY_FULL:
+ id = _get_id();
+ target = xseg_get_target(xseg, req);
+ object = _get_object_from_name(target);
+ r = _readwrite_chunk_full(xseg, req, id, object);
+ break;
+ default:
+ XSEGLOG2(&lc, W, "Unexpected verification mode: %d\n", verify);
}
+ return r;
}
+
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