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author | Alberto Faria <afaria@redhat.com> | 2022-07-05 17:15:09 +0100 |
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committer | Hanna Reitz <hreitz@redhat.com> | 2022-07-12 12:14:56 +0200 |
commit | bf5b16fa401633475d21d69c66532f5b29e8433d (patch) | |
tree | 60779d913b400906135b6bbce90d6128a52ac3ef /qemu-img.c | |
parent | 92529251d2333ea07176cdbd7273483064ba5a7b (diff) | |
download | qemu-bf5b16fa401633475d21d69c66532f5b29e8433d.zip qemu-bf5b16fa401633475d21d69c66532f5b29e8433d.tar.gz qemu-bf5b16fa401633475d21d69c66532f5b29e8433d.tar.bz2 |
block: Make blk_{pread,pwrite}() return 0 on success
They currently return the value of their 'bytes' parameter on success.
Make them return 0 instead, for consistency with other I/O functions and
in preparation to implement them using generated_co_wrapper. This also
makes it clear that short reads/writes are not possible.
Signed-off-by: Alberto Faria <afaria@redhat.com>
Message-Id: <20220705161527.1054072-2-afaria@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Diffstat (limited to 'qemu-img.c')
-rw-r--r-- | qemu-img.c | 25 |
1 files changed, 9 insertions, 16 deletions
@@ -5120,30 +5120,23 @@ static int img_dd(int argc, char **argv) in.buf = g_new(uint8_t, in.bsz); for (out_pos = 0; in_pos < size; block_count++) { - int in_ret, out_ret; + int bytes = (in_pos + in.bsz > size) ? size - in_pos : in.bsz; - if (in_pos + in.bsz > size) { - in_ret = blk_pread(blk1, in_pos, in.buf, size - in_pos); - } else { - in_ret = blk_pread(blk1, in_pos, in.buf, in.bsz); - } - if (in_ret < 0) { + ret = blk_pread(blk1, in_pos, in.buf, bytes); + if (ret < 0) { error_report("error while reading from input image file: %s", - strerror(-in_ret)); - ret = -1; + strerror(-ret)); goto out; } - in_pos += in_ret; + in_pos += bytes; - out_ret = blk_pwrite(blk2, out_pos, in.buf, in_ret, 0); - - if (out_ret < 0) { + ret = blk_pwrite(blk2, out_pos, in.buf, bytes, 0); + if (ret < 0) { error_report("error while writing to output image file: %s", - strerror(-out_ret)); - ret = -1; + strerror(-ret)); goto out; } - out_pos += out_ret; + out_pos += bytes; } out: |