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qcow2: Use negated overflow check mask

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In qcow2_check_metadata_overlap and qcow2_pre_write_overlap_check,
change the parameter signifying the checks to perform from its current
positive form to a negative one, i.e., it will no longer explicitly
specify every check to perform but rather a mask of checks not to
perform.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2013-10-10 11:09:23 +02:00 committed by Kevin Wolf
parent 8f94a6e40e
commit 231bb26764
6 changed files with 29 additions and 38 deletions
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8
block/qcow2-cache.c
View File

@ -115,15 +115,13 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i)
}
if (c == s->refcount_block_cache) {
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_DEFAULT & ~QCOW2_OL_REFCOUNT_BLOCK,
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_REFCOUNT_BLOCK,
c->entries[i].offset, s->cluster_size);
} else if (c == s->l2_table_cache) {
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L2,
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L2,
c->entries[i].offset, s->cluster_size);
} else {
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
ret = qcow2_pre_write_overlap_check(bs, 0,
c->entries[i].offset, s->cluster_size);
}

16
block/qcow2-cluster.c
View File

@ -83,8 +83,8 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
/* the L1 position has not yet been updated, so these clusters must
* indeed be completely free */
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
new_l1_table_offset, new_l1_size2);
ret = qcow2_pre_write_overlap_check(bs, 0, new_l1_table_offset,
new_l1_size2);
if (ret < 0) {
goto fail;
}
@ -160,8 +160,7 @@ int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index)
buf[i] = cpu_to_be64(s->l1_table[l1_start_index + i]);
}
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L1,
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L1,
s->l1_table_offset + 8 * l1_start_index, sizeof(buf));
if (ret < 0) {
return ret;
@ -396,7 +395,7 @@ static int coroutine_fn copy_sectors(BlockDriverState *bs,
&s->aes_encrypt_key);
}
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
ret = qcow2_pre_write_overlap_check(bs, 0,
cluster_offset + n_start * BDRV_SECTOR_SIZE, n * BDRV_SECTOR_SIZE);
if (ret < 0) {
goto out;
@ -1604,8 +1603,7 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
}
}
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
offset, s->cluster_size);
ret = qcow2_pre_write_overlap_check(bs, 0, offset, s->cluster_size);
if (ret < 0) {
if (!preallocated) {
qcow2_free_clusters(bs, offset, s->cluster_size,
@ -1661,8 +1659,8 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
}
} else {
if (l2_dirty) {
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT &
~(QCOW2_OL_INACTIVE_L2 | QCOW2_OL_ACTIVE_L2), l2_offset,
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_INACTIVE_L2 | QCOW2_OL_ACTIVE_L2, l2_offset,
s->cluster_size);
if (ret < 0) {
goto fail;

22
block/qcow2-refcount.c
View File

@ -1311,9 +1311,8 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
}
if (l2_dirty) {
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L2, l2_offset,
s->cluster_size);
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L2,
l2_offset, s->cluster_size);
if (ret < 0) {
fprintf(stderr, "ERROR: Could not write L2 table; metadata "
"overlap check failed: %s\n", strerror(-ret));
@ -1354,8 +1353,7 @@ static int write_reftable_entry(BlockDriverState *bs, int rt_index)
buf[i] = cpu_to_be64(s->refcount_table[rt_start_index + i]);
}
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_DEFAULT & ~QCOW2_OL_REFCOUNT_TABLE,
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_REFCOUNT_TABLE,
s->refcount_table_offset + rt_start_index * sizeof(uint64_t),
sizeof(buf));
if (ret < 0) {
@ -1406,8 +1404,7 @@ static int64_t realloc_refcount_block(BlockDriverState *bs, int reftable_index,
/* new block has not yet been entered into refcount table, therefore it is
* no refcount block yet (regarding this check) */
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, new_offset,
s->cluster_size);
ret = qcow2_pre_write_overlap_check(bs, 0, new_offset, s->cluster_size);
if (ret < 0) {
fprintf(stderr, "Could not write refcount block; metadata overlap "
"check failed: %s\n", strerror(-ret));
@ -1639,8 +1636,8 @@ fail:
* looking for overlaps with important metadata sections (L1/L2 tables etc.),
* i.e. a sanity check without relying on the refcount tables.
*
* The chk parameter specifies exactly what checks to perform (being a bitmask
* of QCow2MetadataOverlap values).
* The ign parameter specifies what checks not to perform (being a bitmask of
* QCow2MetadataOverlap values), i.e., what sections to ignore.
*
* Returns:
* - 0 if writing to this offset will not affect the mentioned metadata
@ -1648,10 +1645,11 @@ fail:
* - a negative value (-errno) indicating an error while performing a check,
* e.g. when bdrv_read failed on QCOW2_OL_INACTIVE_L2
*/
int qcow2_check_metadata_overlap(BlockDriverState *bs, int chk, int64_t offset,
int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
int64_t size)
{
BDRVQcowState *s = bs->opaque;
int chk = QCOW2_OL_DEFAULT & ~ign;
int i, j;
if (!size) {
@ -1767,10 +1765,10 @@ static const char *metadata_ol_names[] = {
* Returns 0 if there were neither overlaps nor errors while checking for
* overlaps; or a negative value (-errno) on error.
*/
int qcow2_pre_write_overlap_check(BlockDriverState *bs, int chk, int64_t offset,
int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
int64_t size)
{
int ret = qcow2_check_metadata_overlap(bs, chk, offset, size);
int ret = qcow2_check_metadata_overlap(bs, ign, offset, size);
if (ret < 0) {
return ret;

12
block/qcow2-snapshot.c
View File

@ -192,8 +192,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
/* The snapshot list position has not yet been updated, so these clusters
* must indeed be completely free */
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, offset,
snapshots_size);
ret = qcow2_pre_write_overlap_check(bs, 0, offset, snapshots_size);
if (ret < 0) {
goto fail;
}
@ -395,8 +394,8 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
l1_table[i] = cpu_to_be64(s->l1_table[i]);
}
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
sn->l1_table_offset, s->l1_size * sizeof(uint64_t));
ret = qcow2_pre_write_overlap_check(bs, 0, sn->l1_table_offset,
s->l1_size * sizeof(uint64_t));
if (ret < 0) {
goto fail;
}
@ -521,9 +520,8 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
goto fail;
}
ret = qcow2_pre_write_overlap_check(bs,
QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L1,
s->l1_table_offset, cur_l1_bytes);
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L1,
s->l1_table_offset, cur_l1_bytes);
if (ret < 0) {
goto fail;
}

5
block/qcow2.c
View File

@ -965,7 +965,7 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
cur_nr_sectors * 512);
}
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
ret = qcow2_pre_write_overlap_check(bs, 0,
cluster_offset + index_in_cluster * BDRV_SECTOR_SIZE,
cur_nr_sectors * BDRV_SECTOR_SIZE);
if (ret < 0) {
@ -1751,8 +1751,7 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
}
cluster_offset &= s->cluster_offset_mask;
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
cluster_offset, out_len);
ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len);
if (ret < 0) {
goto fail;
}

4
block/qcow2.h
View File

@ -433,9 +433,9 @@ int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
void qcow2_process_discards(BlockDriverState *bs, int ret);
int qcow2_check_metadata_overlap(BlockDriverState *bs, int chk, int64_t offset,
int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
int64_t size);
int qcow2_pre_write_overlap_check(BlockDriverState *bs, int chk, int64_t offset,
int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
int64_t size);
/* qcow2-cluster.c functions */