Expand on fill_device option since it apparently causes confusion

[fio.git] / io_u.c

diff --git a/io_u.c b/io_u.c
index 6d539a01fbdaec105144c2b93252683a4630af46..1a45706f160556f2c153bf82505370b484d7055e 100644 (file)
--- a/io_u.c
+++ b/io_u.c
@@ -126,16 +126,20 @@ static unsigned long long last_block(struct thread_data *td, struct fio_file *f,
 static int get_next_free_block(struct thread_data *td, struct fio_file *f,
                               enum fio_ddir ddir, unsigned long long *b)
 {
-       unsigned long long min_bs = td->o.rw_min_bs;
+       unsigned long long min_bs = td->o.rw_min_bs, lastb;
        int i;
 
+       lastb = last_block(td, f, ddir);
+       if (!lastb)
+               return 1;
+
        i = f->last_free_lookup;
        *b = (i * BLOCKS_PER_MAP);
        while ((*b) * min_bs < f->real_file_size &&
                (*b) * min_bs < f->io_size) {
                if (f->file_map[i] != (unsigned int) -1) {
                        *b += ffz(f->file_map[i]);
-                       if (*b > last_block(td, f, ddir))
+                       if (*b > lastb)
                                break;
                        f->last_free_lookup = i;
                        return 0;
@@ -152,14 +156,17 @@ static int get_next_free_block(struct thread_data *td, struct fio_file *f,
 static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
                                enum fio_ddir ddir, unsigned long long *b)
 {
-       unsigned long long r;
+       unsigned long long r, lastb;
        int loops = 5;
 
+       lastb = last_block(td, f, ddir);
+       if (!lastb)
+               return 1;
+
        do {
                r = os_random_long(&td->random_state);
                dprint(FD_RANDOM, "off rand %llu\n", r);
-               *b = (last_block(td, f, ddir) - 1)
-                       * (r / ((unsigned long long) OS_RAND_MAX + 1.0));
+               *b = (lastb - 1) * (r / ((unsigned long long) OS_RAND_MAX + 1.0));
 
                /*
                 * if we are not maintaining a random map, we are done.
@@ -628,31 +635,31 @@ out:
 
 static void __io_u_mark_map(unsigned int *map, unsigned int nr)
 {
-       int index = 0;
+       int idx = 0;
 
        switch (nr) {
        default:
-               index = 6;
+               idx = 6;
                break;
        case 33 ... 64:
-               index = 5;
+               idx = 5;
                break;
        case 17 ... 32:
-               index = 4;
+               idx = 4;
                break;
        case 9 ... 16:
-               index = 3;
+               idx = 3;
                break;
        case 5 ... 8:
-               index = 2;
+               idx = 2;
                break;
        case 1 ... 4:
-               index = 1;
+               idx = 1;
        case 0:
                break;
        }
 
-       map[index]++;
+       map[idx]++;
 }
 
 void io_u_mark_submit(struct thread_data *td, unsigned int nr)
@@ -669,117 +676,117 @@ void io_u_mark_complete(struct thread_data *td, unsigned int nr)
 
 void io_u_mark_depth(struct thread_data *td, unsigned int nr)
 {
-       int index = 0;
+       int idx = 0;
 
        switch (td->cur_depth) {
        default:
-               index = 6;
+               idx = 6;
                break;
        case 32 ... 63:
-               index = 5;
+               idx = 5;
                break;
        case 16 ... 31:
-               index = 4;
+               idx = 4;
                break;
        case 8 ... 15:
-               index = 3;
+               idx = 3;
                break;
        case 4 ... 7:
-               index = 2;
+               idx = 2;
                break;
        case 2 ... 3:
-               index = 1;
+               idx = 1;
        case 1:
                break;
        }
 
-       td->ts.io_u_map[index] += nr;
+       td->ts.io_u_map[idx] += nr;
 }
 
 static void io_u_mark_lat_usec(struct thread_data *td, unsigned long usec)
 {
-       int index = 0;
+       int idx = 0;
 
        assert(usec < 1000);
 
        switch (usec) {
        case 750 ... 999:
-               index = 9;
+               idx = 9;
                break;
        case 500 ... 749:
-               index = 8;
+               idx = 8;
                break;
        case 250 ... 499:
-               index = 7;
+               idx = 7;
                break;
        case 100 ... 249:
-               index = 6;
+               idx = 6;
                break;
        case 50 ... 99:
-               index = 5;
+               idx = 5;
                break;
        case 20 ... 49:
-               index = 4;
+               idx = 4;
                break;
        case 10 ... 19:
-               index = 3;
+               idx = 3;
                break;
        case 4 ... 9:
-               index = 2;
+               idx = 2;
                break;
        case 2 ... 3:
-               index = 1;
+               idx = 1;
        case 0 ... 1:
                break;
        }
 
-       assert(index < FIO_IO_U_LAT_U_NR);
-       td->ts.io_u_lat_u[index]++;
+       assert(idx < FIO_IO_U_LAT_U_NR);
+       td->ts.io_u_lat_u[idx]++;
 }
 
 static void io_u_mark_lat_msec(struct thread_data *td, unsigned long msec)
 {
-       int index = 0;
+       int idx = 0;
 
        switch (msec) {
        default:
-               index = 11;
+               idx = 11;
                break;
        case 1000 ... 1999:
-               index = 10;
+               idx = 10;
                break;
        case 750 ... 999:
-               index = 9;
+               idx = 9;
                break;
        case 500 ... 749:
-               index = 8;
+               idx = 8;
                break;
        case 250 ... 499:
-               index = 7;
+               idx = 7;
                break;
        case 100 ... 249:
-               index = 6;
+               idx = 6;
                break;
        case 50 ... 99:
-               index = 5;
+               idx = 5;
                break;
        case 20 ... 49:
-               index = 4;
+               idx = 4;
                break;
        case 10 ... 19:
-               index = 3;
+               idx = 3;
                break;
        case 4 ... 9:
-               index = 2;
+               idx = 2;
                break;
        case 2 ... 3:
-               index = 1;
+               idx = 1;
        case 0 ... 1:
                break;
        }
 
-       assert(index < FIO_IO_U_LAT_M_NR);
-       td->ts.io_u_lat_m[index]++;
+       assert(idx < FIO_IO_U_LAT_M_NR);
+       td->ts.io_u_lat_m[idx]++;
 }
 
 static void io_u_mark_latency(struct thread_data *td, unsigned long usec)
@@ -1367,6 +1374,8 @@ void io_u_queued(struct thread_data *td, struct io_u *io_u)
 void io_u_fill_buffer(struct thread_data *td, struct io_u *io_u,
                      unsigned int max_bs)
 {
+       io_u->buf_filled_len = 0;
+
        if (!td->o.zero_buffers)
                fill_random_buf(io_u->buf, max_bs);
        else