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qcow2: Nicer variable names in qcow2_update_snapshot_refcount()

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In order to keep checkpatch happy when the next patch changes
indentation, we first have to shorten some long lines.  The easiest
approach is to use a new variable in place of
'offset & L2E_OFFSET_MASK', except that 'offset' is the best name
for that variable.  Change '[old_]offset' to '[old_]entry' to
make room.

While touching things, also fix checkpatch warnings about unusual
'for' statements.

Suggested by Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 20170507000552.20847-2-eblake@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Eric Blake 2017-05-06 19:05:41 -05:00 committed by Max Reitz
parent 40812d9373
commit b32cbae111
1 changed files with 22 additions and 20 deletions
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36
block/qcow2-refcount.c
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@ -1059,9 +1059,9 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
int64_t l1_table_offset, int l1_size, int addend)
{
BDRVQcow2State *s = bs->opaque;
uint64_t *l1_table, *l2_table, l2_offset, offset, l1_size2, refcount;
uint64_t *l1_table, *l2_table, l2_offset, entry, l1_size2, refcount;
bool l1_allocated = false;
int64_t old_offset, old_l2_offset;
int64_t old_entry, old_l2_offset;
int i, j, l1_modified = 0, nb_csectors;
int ret;
@ -1089,8 +1089,9 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
goto fail;
}
for(i = 0;i < l1_size; i++)
for (i = 0; i < l1_size; i++) {
be64_to_cpus(&l1_table[i]);
}
} else {
assert(l1_size == s->l1_size);
l1_table = s->l1_table;
@ -1119,18 +1120,20 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
for (j = 0; j < s->l2_size; j++) {
uint64_t cluster_index;
uint64_t offset;
offset = be64_to_cpu(l2_table[j]);
old_offset = offset;
offset &= ~QCOW_OFLAG_COPIED;
entry = be64_to_cpu(l2_table[j]);
old_entry = entry;
entry &= ~QCOW_OFLAG_COPIED;
offset = entry & L2E_OFFSET_MASK;
switch (qcow2_get_cluster_type(offset)) {
switch (qcow2_get_cluster_type(entry)) {
case QCOW2_CLUSTER_COMPRESSED:
nb_csectors = ((offset >> s->csize_shift) &
nb_csectors = ((entry >> s->csize_shift) &
s->csize_mask) + 1;
if (addend != 0) {
ret = update_refcount(bs,
(offset & s->cluster_offset_mask) & ~511,
(entry & s->cluster_offset_mask) & ~511,
nb_csectors * 512, abs(addend), addend < 0,
QCOW2_DISCARD_SNAPSHOT);
if (ret < 0) {
@ -1143,18 +1146,17 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
case QCOW2_CLUSTER_NORMAL:
case QCOW2_CLUSTER_ZERO:
if (offset_into_cluster(s, offset & L2E_OFFSET_MASK)) {
if (offset_into_cluster(s, offset)) {
qcow2_signal_corruption(bs, true, -1, -1, "Data "
"cluster offset %#llx "
"cluster offset %#" PRIx64
" unaligned (L2 offset: %#"
PRIx64 ", L2 index: %#x)",
offset & L2E_OFFSET_MASK,
l2_offset, j);
offset, l2_offset, j);
ret = -EIO;
goto fail;
}
cluster_index = (offset & L2E_OFFSET_MASK) >> s->cluster_bits;
cluster_index = offset >> s->cluster_bits;
if (!cluster_index) {
/* unallocated */
refcount = 0;
@ -1184,14 +1186,14 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
}
if (refcount == 1) {
offset |= QCOW_OFLAG_COPIED;
entry |= QCOW_OFLAG_COPIED;
}
if (offset != old_offset) {
if (entry != old_entry) {
if (addend > 0) {
qcow2_cache_set_dependency(bs, s->l2_table_cache,
s->refcount_block_cache);
}
l2_table[j] = cpu_to_be64(offset);
l2_table[j] = cpu_to_be64(entry);
qcow2_cache_entry_mark_dirty(bs, s->l2_table_cache,
l2_table);
}