Revision 8b81a7b6 block/qcow2-refcount.c
| b/block/qcow2-refcount.c | ||
|---|---|---|
| 861 | 861 |
} |
| 862 | 862 |
|
| 863 | 863 |
for(j = 0; j < s->l2_size; j++) {
|
| 864 |
uint64_t cluster_index; |
|
| 865 |
|
|
| 864 | 866 |
offset = be64_to_cpu(l2_table[j]); |
| 865 |
if (offset != 0) {
|
|
| 866 |
old_offset = offset; |
|
| 867 |
offset &= ~QCOW_OFLAG_COPIED; |
|
| 868 |
if (offset & QCOW_OFLAG_COMPRESSED) {
|
|
| 867 |
old_offset = offset; |
|
| 868 |
offset &= ~QCOW_OFLAG_COPIED; |
|
| 869 |
|
|
| 870 |
switch (qcow2_get_cluster_type(offset)) {
|
|
| 871 |
case QCOW2_CLUSTER_COMPRESSED: |
|
| 869 | 872 |
nb_csectors = ((offset >> s->csize_shift) & |
| 870 | 873 |
s->csize_mask) + 1; |
| 871 | 874 |
if (addend != 0) {
|
| ... | ... | |
| 880 | 883 |
} |
| 881 | 884 |
/* compressed clusters are never modified */ |
| 882 | 885 |
refcount = 2; |
| 883 |
} else {
|
|
| 884 |
uint64_t cluster_index = (offset & L2E_OFFSET_MASK) >> s->cluster_bits; |
|
| 886 |
break; |
|
| 887 |
|
|
| 888 |
case QCOW2_CLUSTER_NORMAL: |
|
| 889 |
case QCOW2_CLUSTER_ZERO: |
|
| 890 |
cluster_index = (offset & L2E_OFFSET_MASK) >> s->cluster_bits; |
|
| 891 |
if (!cluster_index) {
|
|
| 892 |
/* unallocated */ |
|
| 893 |
refcount = 0; |
|
| 894 |
break; |
|
| 895 |
} |
|
| 885 | 896 |
if (addend != 0) {
|
| 886 | 897 |
refcount = update_cluster_refcount(bs, cluster_index, addend, |
| 887 | 898 |
QCOW2_DISCARD_SNAPSHOT); |
| ... | ... | |
| 893 | 904 |
ret = refcount; |
| 894 | 905 |
goto fail; |
| 895 | 906 |
} |
| 896 |
}
|
|
| 907 |
break;
|
|
| 897 | 908 |
|
| 898 |
if (refcount == 1) {
|
|
| 899 |
offset |= QCOW_OFLAG_COPIED; |
|
| 900 |
} |
|
| 901 |
if (offset != old_offset) {
|
|
| 902 |
if (addend > 0) {
|
|
| 903 |
qcow2_cache_set_dependency(bs, s->l2_table_cache, |
|
| 904 |
s->refcount_block_cache); |
|
| 905 |
} |
|
| 906 |
l2_table[j] = cpu_to_be64(offset); |
|
| 907 |
qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table); |
|
| 909 |
case QCOW2_CLUSTER_UNALLOCATED: |
|
| 910 |
refcount = 0; |
|
| 911 |
break; |
|
| 912 |
|
|
| 913 |
default: |
|
| 914 |
abort(); |
|
| 915 |
} |
|
| 916 |
|
|
| 917 |
if (refcount == 1) {
|
|
| 918 |
offset |= QCOW_OFLAG_COPIED; |
|
| 919 |
} |
|
| 920 |
if (offset != old_offset) {
|
|
| 921 |
if (addend > 0) {
|
|
| 922 |
qcow2_cache_set_dependency(bs, s->l2_table_cache, |
|
| 923 |
s->refcount_block_cache); |
|
| 908 | 924 |
} |
| 925 |
l2_table[j] = cpu_to_be64(offset); |
|
| 926 |
qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table); |
|
| 909 | 927 |
} |
| 910 | 928 |
} |
| 911 | 929 |
|
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