Revision bc352085 block-qcow2.c
| b/block-qcow2.c | ||
|---|---|---|
| 870 | 870 |
BDRVQcowState *s = bs->opaque; |
| 871 | 871 |
int l2_index, ret; |
| 872 | 872 |
uint64_t l2_offset, *l2_table, cluster_offset; |
| 873 |
int nb_available, nb_clusters, i; |
|
| 873 |
int nb_available, nb_clusters, i, j;
|
|
| 874 | 874 |
uint64_t start_sect, current; |
| 875 | 875 |
|
| 876 | 876 |
ret = get_cluster_table(bs, offset, &l2_table, &l2_offset, &l2_index); |
| ... | ... | |
| 909 | 909 |
if (cluster_offset & QCOW_OFLAG_COMPRESSED) |
| 910 | 910 |
nb_clusters = 1; |
| 911 | 911 |
|
| 912 |
/* how many empty or how many to free ? */
|
|
| 912 |
/* how many available clusters ? */
|
|
| 913 | 913 |
|
| 914 |
if (!cluster_offset) {
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|
| 914 |
i = 0; |
|
| 915 |
while (i < nb_clusters) {
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|
| 915 | 916 |
|
| 916 |
/* how many free clusters ? */
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| 917 |
i++;
|
|
| 917 | 918 |
|
| 918 |
i = 1; |
|
| 919 |
while (i < nb_clusters && |
|
| 920 |
l2_table[l2_index + i] == 0) {
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| 921 |
i++; |
|
| 922 |
} |
|
| 923 |
nb_clusters = i; |
|
| 919 |
if (!cluster_offset) {
|
|
| 924 | 920 |
|
| 925 |
} else {
|
|
| 921 |
/* how many free clusters ? */
|
|
| 926 | 922 |
|
| 927 |
/* how many contiguous clusters ? */ |
|
| 923 |
while (i < nb_clusters) {
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|
| 924 |
cluster_offset = l2_table[l2_index + i]; |
|
| 925 |
if (cluster_offset != 0) |
|
| 926 |
break; |
|
| 927 |
i++; |
|
| 928 |
} |
|
| 928 | 929 |
|
| 929 |
for (i = 1; i < nb_clusters; i++) {
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|
| 930 |
current = be64_to_cpu(l2_table[l2_index + i]); |
|
| 931 |
if (cluster_offset + (i << s->cluster_bits) != current) |
|
| 930 |
if ((cluster_offset & QCOW_OFLAG_COPIED) || |
|
| 931 |
(cluster_offset & QCOW_OFLAG_COMPRESSED)) |
|
| 932 | 932 |
break; |
| 933 |
} |
|
| 934 |
nb_clusters = i; |
|
| 935 | 933 |
|
| 936 |
free_any_clusters(bs, cluster_offset, i); |
|
| 934 |
} else {
|
|
| 935 |
|
|
| 936 |
/* how many contiguous clusters ? */ |
|
| 937 |
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|
| 938 |
j = 1; |
|
| 939 |
current = 0; |
|
| 940 |
while (i < nb_clusters) {
|
|
| 941 |
current = be64_to_cpu(l2_table[l2_index + i]); |
|
| 942 |
if (cluster_offset + (j << s->cluster_bits) != current) |
|
| 943 |
break; |
|
| 944 |
|
|
| 945 |
i++; |
|
| 946 |
j++; |
|
| 947 |
} |
|
| 948 |
|
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| 949 |
free_any_clusters(bs, cluster_offset, j); |
|
| 950 |
if (current) |
|
| 951 |
break; |
|
| 952 |
cluster_offset = current; |
|
| 953 |
} |
|
| 937 | 954 |
} |
| 955 |
nb_clusters = i; |
|
| 938 | 956 |
|
| 939 | 957 |
/* allocate a new cluster */ |
| 940 | 958 |
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