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block: Don't throw away errno via error_setg

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There are a handful of places in the block layer where a failure path
has a valid -errno value, yet error_setg() is used.  Those instances
should instead use error_setg_errno(), to preserve as much error
information as possible.

This patch replaces those instances with error_setg_errno(), so that
errno is passed up the stack in the error message.

Reported-By: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Jeff Cody 2014-02-12 14:46:24 -05:00 committed by Stefan Hajnoczi
parent 28f106afb3
commit 39a611a3e0
3 changed files with 17 additions and 10 deletions
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13
block/mirror.c
View file

@ -633,6 +633,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
{
int64_t length, base_length;
int orig_base_flags;
int ret;
orig_base_flags = bdrv_get_flags(base);
@ -642,19 +643,23 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
length = bdrv_getlength(bs);
if (length < 0) {
error_setg(errp, "Unable to determine length of %s", bs->filename);
error_setg_errno(errp, -length,
"Unable to determine length of %s", bs->filename);
goto error_restore_flags;
}
base_length = bdrv_getlength(base);
if (base_length < 0) {
error_setg(errp, "Unable to determine length of %s", base->filename);
error_setg_errno(errp, -base_length,
"Unable to determine length of %s", base->filename);
goto error_restore_flags;
}
if (length > base_length) {
if (bdrv_truncate(base, length) < 0) {
error_setg(errp, "Top image %s is larger than base image %s, and "
ret = bdrv_truncate(base, length);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Top image %s is larger than base image %s, and "
"resize of base image failed",
bs->filename, base->filename);
goto error_restore_flags;

8
block/qcow2-snapshot.c
View file

@ -606,7 +606,8 @@ int qcow2_snapshot_delete(BlockDriverState *bs,
s->nb_snapshots--;
ret = qcow2_write_snapshots(bs);
if (ret < 0) {
error_setg(errp, "Failed to remove snapshot from snapshot list");
error_setg_errno(errp, -ret,
"Failed to remove snapshot from snapshot list");
return ret;
}
@ -624,7 +625,7 @@ int qcow2_snapshot_delete(BlockDriverState *bs,
ret = qcow2_update_snapshot_refcount(bs, sn.l1_table_offset,
sn.l1_size, -1);
if (ret < 0) {
error_setg(errp, "Failed to free the cluster and L1 table");
error_setg_errno(errp, -ret, "Failed to free the cluster and L1 table");
return ret;
}
qcow2_free_clusters(bs, sn.l1_table_offset, sn.l1_size * sizeof(uint64_t),
@ -633,7 +634,8 @@ int qcow2_snapshot_delete(BlockDriverState *bs,
/* must update the copied flag on the current cluster offsets */
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
if (ret < 0) {
error_setg(errp, "Failed to update snapshot status in disk");
error_setg_errno(errp, -ret,
"Failed to update snapshot status in disk");
return ret;
}

6
block/vmdk.c
View file

@ -1502,7 +1502,7 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
if (flat) {
ret = bdrv_truncate(bs, filesize);
if (ret < 0) {
error_setg(errp, "Could not truncate file");
error_setg_errno(errp, -ret, "Could not truncate file");
}
goto exit;
}
@ -1562,7 +1562,7 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
ret = bdrv_truncate(bs, le64_to_cpu(header.grain_offset) << 9);
if (ret < 0) {
error_setg(errp, "Could not truncate file");
error_setg_errno(errp, -ret, "Could not truncate file");
goto exit;
}
@ -1846,7 +1846,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
if (desc_offset == 0) {
ret = bdrv_truncate(new_bs, desc_len);
if (ret < 0) {
error_setg(errp, "Could not truncate file");
error_setg_errno(errp, -ret, "Could not truncate file");
}
}
exit: