aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorMax Reitz <mreitz@redhat.com>2015-02-10 15:28:51 -0500
committerKevin Wolf <kwolf@redhat.com>2015-03-10 14:02:21 +0100
commit59c0cb7830be68080c6a0d1449253b954350e57d (patch)
tree101df899f44f430e7d82e3eaae63241fc9534f36 /block
parent7453c96b78c2b09aa72924f933bb9616e5474194 (diff)
qcow2: More helpers for refcount modification
Add helper functions for getting and setting refcounts in a refcount array for any possible refcount order, and choose the correct one during refcount initialization. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/qcow2-refcount.c121
1 files changed, 119 insertions, 2 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index c0c1313ddb..dc8d186a82 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -32,10 +32,49 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs,
int64_t offset, int64_t length, uint64_t addend,
bool decrease, enum qcow2_discard_type type);
+static uint64_t get_refcount_ro0(const void *refcount_array, uint64_t index);
+static uint64_t get_refcount_ro1(const void *refcount_array, uint64_t index);
+static uint64_t get_refcount_ro2(const void *refcount_array, uint64_t index);
+static uint64_t get_refcount_ro3(const void *refcount_array, uint64_t index);
static uint64_t get_refcount_ro4(const void *refcount_array, uint64_t index);
+static uint64_t get_refcount_ro5(const void *refcount_array, uint64_t index);
+static uint64_t get_refcount_ro6(const void *refcount_array, uint64_t index);
+static void set_refcount_ro0(void *refcount_array, uint64_t index,
+ uint64_t value);
+static void set_refcount_ro1(void *refcount_array, uint64_t index,
+ uint64_t value);
+static void set_refcount_ro2(void *refcount_array, uint64_t index,
+ uint64_t value);
+static void set_refcount_ro3(void *refcount_array, uint64_t index,
+ uint64_t value);
static void set_refcount_ro4(void *refcount_array, uint64_t index,
uint64_t value);
+static void set_refcount_ro5(void *refcount_array, uint64_t index,
+ uint64_t value);
+static void set_refcount_ro6(void *refcount_array, uint64_t index,
+ uint64_t value);
+
+
+static Qcow2GetRefcountFunc *const get_refcount_funcs[] = {
+ &get_refcount_ro0,
+ &get_refcount_ro1,
+ &get_refcount_ro2,
+ &get_refcount_ro3,
+ &get_refcount_ro4,
+ &get_refcount_ro5,
+ &get_refcount_ro6
+};
+
+static Qcow2SetRefcountFunc *const set_refcount_funcs[] = {
+ &set_refcount_ro0,
+ &set_refcount_ro1,
+ &set_refcount_ro2,
+ &set_refcount_ro3,
+ &set_refcount_ro4,
+ &set_refcount_ro5,
+ &set_refcount_ro6
+};
/*********************************************************/
@@ -47,8 +86,10 @@ int qcow2_refcount_init(BlockDriverState *bs)
unsigned int refcount_table_size2, i;
int ret;
- s->get_refcount = &get_refcount_ro4;
- s->set_refcount = &set_refcount_ro4;
+ assert(s->refcount_order >= 0 && s->refcount_order <= 6);
+
+ s->get_refcount = get_refcount_funcs[s->refcount_order];
+ s->set_refcount = set_refcount_funcs[s->refcount_order];
assert(s->refcount_table_size <= INT_MAX / sizeof(uint64_t));
refcount_table_size2 = s->refcount_table_size * sizeof(uint64_t);
@@ -80,6 +121,59 @@ void qcow2_refcount_close(BlockDriverState *bs)
}
+static uint64_t get_refcount_ro0(const void *refcount_array, uint64_t index)
+{
+ return (((const uint8_t *)refcount_array)[index / 8] >> (index % 8)) & 0x1;
+}
+
+static void set_refcount_ro0(void *refcount_array, uint64_t index,
+ uint64_t value)
+{
+ assert(!(value >> 1));
+ ((uint8_t *)refcount_array)[index / 8] &= ~(0x1 << (index % 8));
+ ((uint8_t *)refcount_array)[index / 8] |= value << (index % 8);
+}
+
+static uint64_t get_refcount_ro1(const void *refcount_array, uint64_t index)
+{
+ return (((const uint8_t *)refcount_array)[index / 4] >> (2 * (index % 4)))
+ & 0x3;
+}
+
+static void set_refcount_ro1(void *refcount_array, uint64_t index,
+ uint64_t value)
+{
+ assert(!(value >> 2));
+ ((uint8_t *)refcount_array)[index / 4] &= ~(0x3 << (2 * (index % 4)));
+ ((uint8_t *)refcount_array)[index / 4] |= value << (2 * (index % 4));
+}
+
+static uint64_t get_refcount_ro2(const void *refcount_array, uint64_t index)
+{
+ return (((const uint8_t *)refcount_array)[index / 2] >> (4 * (index % 2)))
+ & 0xf;
+}
+
+static void set_refcount_ro2(void *refcount_array, uint64_t index,
+ uint64_t value)
+{
+ assert(!(value >> 4));
+ ((uint8_t *)refcount_array)[index / 2] &= ~(0xf << (4 * (index % 2)));
+ ((uint8_t *)refcount_array)[index / 2] |= value << (4 * (index % 2));
+}
+
+static uint64_t get_refcount_ro3(const void *refcount_array, uint64_t index)
+{
+ return ((const uint8_t *)refcount_array)[index];
+}
+
+static void set_refcount_ro3(void *refcount_array, uint64_t index,
+ uint64_t value)
+{
+ assert(!(value >> 8));
+ ((uint8_t *)refcount_array)[index] = value;
+}
+
static uint64_t get_refcount_ro4(const void *refcount_array, uint64_t index)
{
return be16_to_cpu(((const uint16_t *)refcount_array)[index]);
@@ -92,6 +186,29 @@ static void set_refcount_ro4(void *refcount_array, uint64_t index,
((uint16_t *)refcount_array)[index] = cpu_to_be16(value);
}
+static uint64_t get_refcount_ro5(const void *refcount_array, uint64_t index)
+{
+ return be32_to_cpu(((const uint32_t *)refcount_array)[index]);
+}
+
+static void set_refcount_ro5(void *refcount_array, uint64_t index,
+ uint64_t value)
+{
+ assert(!(value >> 32));
+ ((uint32_t *)refcount_array)[index] = cpu_to_be32(value);
+}
+
+static uint64_t get_refcount_ro6(const void *refcount_array, uint64_t index)
+{
+ return be64_to_cpu(((const uint64_t *)refcount_array)[index]);
+}
+
+static void set_refcount_ro6(void *refcount_array, uint64_t index,
+ uint64_t value)
+{
+ ((uint64_t *)refcount_array)[index] = cpu_to_be64(value);
+}
+
static int load_refcount_block(BlockDriverState *bs,
int64_t refcount_block_offset,