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qemu-img: make progress output more accurate during convert

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the progress output is very bumpy if the input images contains
a significant portion of unallocated sectors. This patch
checks how much sectors are allocated a priori if progress
output is selected.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Lieven 2013-12-05 15:54:53 +01:00 committed by Kevin Wolf
parent 3d94ce60ae
commit 802c3d4ccc
1 changed files with 21 additions and 5 deletions
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26
qemu-img.c
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@ -1135,8 +1135,7 @@ static int img_convert(int argc, char **argv)
const char *fmt, *out_fmt, *cache, *out_baseimg, *out_filename;
BlockDriver *drv, *proto_drv;
BlockDriverState **bs = NULL, *out_bs = NULL;
int64_t total_sectors, nb_sectors, sector_num, bs_offset,
sector_num_next_status = 0;
int64_t total_sectors, nb_sectors, sector_num, bs_offset;
uint64_t bs_sectors;
uint8_t * buf = NULL;
size_t bufsectors = IO_BUF_SIZE / BDRV_SECTOR_SIZE;
@ -1505,6 +1504,8 @@ static int img_convert(int argc, char **argv)
/* signal EOF to align */
bdrv_write_compressed(out_bs, 0, NULL, 0);
} else {
int64_t sectors_to_read, sectors_read, sector_num_next_status;
bool count_allocated_sectors;
int has_zero_init = min_sparse ? bdrv_has_zero_init(out_bs) : 0;
if (!has_zero_init && bdrv_can_write_zeroes_with_unmap(out_bs)) {
@ -1515,12 +1516,21 @@ static int img_convert(int argc, char **argv)
has_zero_init = 1;
}
sectors_to_read = total_sectors;
count_allocated_sectors = progress && (out_baseimg || has_zero_init);
restart:
sector_num = 0; // total number of sectors converted so far
nb_sectors = total_sectors - sector_num;
sectors_read = 0;
sector_num_next_status = 0;
for(;;) {
nb_sectors = total_sectors - sector_num;
if (nb_sectors <= 0) {
if (count_allocated_sectors) {
sectors_to_read = sectors_read;
count_allocated_sectors = false;
goto restart;
}
ret = 0;
break;
}
@ -1586,8 +1596,14 @@ static int img_convert(int argc, char **argv)
}
n = MIN(n, bs_sectors - (sector_num - bs_offset));
n1 = n;
sectors_read += n;
if (count_allocated_sectors) {
sector_num += n;
continue;
}
n1 = n;
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n);
if (ret < 0) {
error_report("error while reading sector %" PRId64 ": %s",
@ -1612,7 +1628,7 @@ static int img_convert(int argc, char **argv)
n -= n1;
buf1 += n1 * 512;
}
qemu_progress_print(100.0 * sector_num / total_sectors, 0);
qemu_progress_print(100.0 * sectors_read / sectors_to_read, 0);
}
}
out: