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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>
This commit is contained in:
Alberto Faria 2022-07-05 17:15:09 +01:00 committed by Hanna Reitz
parent 92529251d2
commit bf5b16fa40
12 changed files with 49 additions and 51 deletions
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8
block.c
View File

@ -1045,14 +1045,16 @@ static int find_image_format(BlockBackend *file, const char *filename,
return ret;
}
drv = bdrv_probe_all(buf, ret, filename);
drv = bdrv_probe_all(buf, sizeof(buf), filename);
if (!drv) {
error_setg(errp, "Could not determine image format: No compatible "
"driver found");
ret = -ENOENT;
*pdrv = NULL;
return -ENOENT;
}
*pdrv = drv;
return ret;
return 0;
}
/**

7
block/block-backend.c
View File

@ -1573,19 +1573,16 @@ int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int bytes)
ret = blk_do_preadv(blk, offset, bytes, &qiov, 0);
blk_dec_in_flight(blk);
return ret < 0 ? ret : bytes;
return ret;
}
int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int bytes,
BdrvRequestFlags flags)
{
int ret;
QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
IO_OR_GS_CODE();
ret = blk_pwritev_part(blk, offset, bytes, &qiov, 0, flags);
return ret < 0 ? ret : bytes;
return blk_pwritev_part(blk, offset, bytes, &qiov, 0, flags);
}
int64_t blk_getlength(BlockBackend *blk)

6
block/qcow.c
View File

@ -891,14 +891,14 @@ static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts,
/* write all the data */
ret = blk_pwrite(qcow_blk, 0, &header, sizeof(header), 0);
if (ret != sizeof(header)) {
if (ret < 0) {
goto exit;
}
if (qcow_opts->has_backing_file) {
ret = blk_pwrite(qcow_blk, sizeof(header),
qcow_opts->backing_file, backing_filename_len, 0);
if (ret != backing_filename_len) {
if (ret < 0) {
goto exit;
}
}
@ -908,7 +908,7 @@ static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts,
i++) {
ret = blk_pwrite(qcow_blk, header_size + BDRV_SECTOR_SIZE * i,
tmp, BDRV_SECTOR_SIZE, 0);
if (ret != BDRV_SECTOR_SIZE) {
if (ret < 0) {
g_free(tmp);
goto exit;
}

2
hw/block/m25p80.c
View File

@ -1532,7 +1532,7 @@ static void m25p80_realize(SSIPeripheral *ss, Error **errp)
trace_m25p80_binding(s);
s->storage = blk_blockalign(s->blk, s->size);
if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) {
if (blk_pread(s->blk, 0, s->storage, s->size) < 0) {
error_setg(errp, "failed to read the initial flash content");
return;
}

4
hw/misc/mac_via.c
View File

@ -1029,8 +1029,8 @@ static void mos6522_q800_via1_realize(DeviceState *dev, Error **errp)
return;
}
len = blk_pread(v1s->blk, 0, v1s->PRAM, sizeof(v1s->PRAM));
if (len != sizeof(v1s->PRAM)) {
ret = blk_pread(v1s->blk, 0, v1s->PRAM, sizeof(v1s->PRAM));
if (ret < 0) {
error_setg(errp, "can't read PRAM contents");
return;
}

2
hw/misc/sifive_u_otp.c
View File

@ -240,7 +240,7 @@ static void sifive_u_otp_realize(DeviceState *dev, Error **errp)
return;
}
if (blk_pread(s->blk, 0, s->fuse, filesize) != filesize) {
if (blk_pread(s->blk, 0, s->fuse, filesize) < 0) {
error_setg(errp, "failed to read the initial flash content");
return;
}

8
hw/nvram/eeprom_at24c.c
View File

@ -64,8 +64,8 @@ int at24c_eeprom_event(I2CSlave *s, enum i2c_event event)
case I2C_START_RECV:
DPRINTK("clear\n");
if (ee->blk && ee->changed) {
int len = blk_pwrite(ee->blk, 0, ee->mem, ee->rsize, 0);
if (len != ee->rsize) {
int ret = blk_pwrite(ee->blk, 0, ee->mem, ee->rsize, 0);
if (ret < 0) {
ERR(TYPE_AT24C_EE
" : failed to write backing file\n");
}
@ -165,9 +165,9 @@ void at24c_eeprom_reset(DeviceState *state)
memset(ee->mem, 0, ee->rsize);
if (ee->blk) {
int len = blk_pread(ee->blk, 0, ee->mem, ee->rsize);
int ret = blk_pread(ee->blk, 0, ee->mem, ee->rsize);
if (len != ee->rsize) {
if (ret < 0) {
ERR(TYPE_AT24C_EE
" : Failed initial sync with backing file\n");
}

14
hw/nvram/spapr_nvram.c
View File

@ -103,7 +103,7 @@ static void rtas_nvram_store(PowerPCCPU *cpu, SpaprMachineState *spapr,
{
SpaprNvram *nvram = spapr->nvram;
hwaddr offset, buffer, len;
int alen;
int ret;
void *membuf;
if ((nargs != 3) || (nret != 2)) {
@ -128,9 +128,9 @@ static void rtas_nvram_store(PowerPCCPU *cpu, SpaprMachineState *spapr,
membuf = cpu_physical_memory_map(buffer, &len, false);
alen = len;
ret = 0;
if (nvram->blk) {
alen = blk_pwrite(nvram->blk, offset, membuf, len, 0);
ret = blk_pwrite(nvram->blk, offset, membuf, len, 0);
}
assert(nvram->buf);
@ -138,8 +138,8 @@ static void rtas_nvram_store(PowerPCCPU *cpu, SpaprMachineState *spapr,
cpu_physical_memory_unmap(membuf, len, 0, len);
rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS);
rtas_st(rets, 1, (alen < 0) ? 0 : alen);
rtas_st(rets, 0, (ret < 0) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS);
rtas_st(rets, 1, (ret < 0) ? 0 : len);
}
static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp)
@ -179,9 +179,9 @@ static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp)
}
if (nvram->blk) {
int alen = blk_pread(nvram->blk, 0, nvram->buf, nvram->size);
ret = blk_pread(nvram->blk, 0, nvram->buf, nvram->size);
if (alen != nvram->size) {
if (ret < 0) {
error_setg(errp, "can't read spapr-nvram contents");
return;
}

2
hw/ppc/pnv_pnor.c
View File

@ -99,7 +99,7 @@ static void pnv_pnor_realize(DeviceState *dev, Error **errp)
s->storage = blk_blockalign(s->blk, s->size);
if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) {
if (blk_pread(s->blk, 0, s->storage, s->size) < 0) {
error_setg(errp, "failed to read the initial flash content");
return;
}

25
qemu-img.c
View File

@ -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:

18
qemu-io-cmds.c
View File

@ -541,28 +541,34 @@ fail:
static int do_pread(BlockBackend *blk, char *buf, int64_t offset,
int64_t bytes, int64_t *total)
{
int ret;
if (bytes > INT_MAX) {
return -ERANGE;
}
*total = blk_pread(blk, offset, (uint8_t *)buf, bytes);
if (*total < 0) {
return *total;
ret = blk_pread(blk, offset, (uint8_t *)buf, bytes);
if (ret < 0) {
return ret;
}
*total = bytes;
return 1;
}
static int do_pwrite(BlockBackend *blk, char *buf, int64_t offset,
int64_t bytes, int flags, int64_t *total)
{
int ret;
if (bytes > INT_MAX) {
return -ERANGE;
}
*total = blk_pwrite(blk, offset, (uint8_t *)buf, bytes, flags);
if (*total < 0) {
return *total;
ret = blk_pwrite(blk, offset, (uint8_t *)buf, bytes, flags);
if (ret < 0) {
return ret;
}
*total = bytes;
return 1;
}

4
tests/unit/test-block-iothread.c
View File

@ -117,7 +117,7 @@ static void test_sync_op_blk_pread(BlockBackend *blk)
/* Success */
ret = blk_pread(blk, 0, buf, sizeof(buf));
g_assert_cmpint(ret, ==, 512);
g_assert_cmpint(ret, ==, 0);
/* Early error: Negative offset */
ret = blk_pread(blk, -2, buf, sizeof(buf));
@ -131,7 +131,7 @@ static void test_sync_op_blk_pwrite(BlockBackend *blk)
/* Success */
ret = blk_pwrite(blk, 0, buf, sizeof(buf), 0);
g_assert_cmpint(ret, ==, 512);
g_assert_cmpint(ret, ==, 0);
/* Early error: Negative offset */
ret = blk_pwrite(blk, -2, buf, sizeof(buf), 0);