From 0b47923f65c2e457bb642b949f0e3dda722eba35 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Sat, 13 Jun 2015 16:22:26 +0200 Subject: [PATCH 32/42] qcow2: Drop REFCOUNT_SHIFT Message-id: <1434212556-3927-33-git-send-email-mreitz@redhat.com> Patchwork-id: 66051 O-Subject: [RHEL-7.2 qemu-kvm PATCH 32/42] qcow2: Drop REFCOUNT_SHIFT Bugzilla: 1129893 RH-Acked-by: Jeffrey Cody RH-Acked-by: Fam Zheng RH-Acked-by: Stefan Hajnoczi BZ: 1129893 With BDRVQcowState.refcount_block_bits, we don't need REFCOUNT_SHIFT anymore. Signed-off-by: Max Reitz Reviewed-by: Eric Blake Signed-off-by: Kevin Wolf (cherry picked from commit 17bd5f472754acd2458b53dc02a30d5651e6dd79) Signed-off-by: Max Reitz Signed-off-by: Miroslav Rezanina --- block/qcow2-refcount.c | 32 ++++++++++++++------------------ block/qcow2.c | 2 +- block/qcow2.h | 2 -- 3 files changed, 15 insertions(+), 21 deletions(-) diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index fe36bbd..87b932c 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -94,7 +94,7 @@ static int get_refcount(BlockDriverState *bs, int64_t cluster_index) uint16_t *refcount_block; uint16_t refcount; - refcount_table_index = cluster_index >> (s->cluster_bits - REFCOUNT_SHIFT); + refcount_table_index = cluster_index >> s->refcount_block_bits; if (refcount_table_index >= s->refcount_table_size) return 0; refcount_block_offset = s->refcount_table[refcount_table_index]; @@ -114,8 +114,7 @@ static int get_refcount(BlockDriverState *bs, int64_t cluster_index) return ret; } - block_index = cluster_index & - ((1 << (s->cluster_bits - REFCOUNT_SHIFT)) - 1); + block_index = cluster_index & (s->refcount_block_size - 1); refcount = be16_to_cpu(refcount_block[block_index]); ret = qcow2_cache_put(bs, s->refcount_block_cache, @@ -150,8 +149,8 @@ static unsigned int next_refcount_table_size(BDRVQcowState *s, static int in_same_refcount_block(BDRVQcowState *s, uint64_t offset_a, uint64_t offset_b) { - uint64_t block_a = offset_a >> (2 * s->cluster_bits - REFCOUNT_SHIFT); - uint64_t block_b = offset_b >> (2 * s->cluster_bits - REFCOUNT_SHIFT); + uint64_t block_a = offset_a >> (s->cluster_bits + s->refcount_block_bits); + uint64_t block_b = offset_b >> (s->cluster_bits + s->refcount_block_bits); return (block_a == block_b); } @@ -172,7 +171,7 @@ static int alloc_refcount_block(BlockDriverState *bs, BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC); /* Find the refcount block for the given cluster */ - refcount_table_index = cluster_index >> (s->cluster_bits - REFCOUNT_SHIFT); + refcount_table_index = cluster_index >> s->refcount_block_bits; if (refcount_table_index < s->refcount_table_size) { @@ -249,7 +248,7 @@ static int alloc_refcount_block(BlockDriverState *bs, /* The block describes itself, need to update the cache */ int block_index = (new_block >> s->cluster_bits) & - ((1 << (s->cluster_bits - REFCOUNT_SHIFT)) - 1); + (s->refcount_block_size - 1); (*refcount_block)[block_index] = cpu_to_be16(1); } else { /* Described somewhere else. This can recurse at most twice before we @@ -321,8 +320,7 @@ static int alloc_refcount_block(BlockDriverState *bs, BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_GROW); /* Calculate the number of refcount blocks needed so far */ - uint64_t refcount_block_clusters = 1 << (s->cluster_bits - REFCOUNT_SHIFT); - uint64_t blocks_used = DIV_ROUND_UP(cluster_index, refcount_block_clusters); + uint64_t blocks_used = DIV_ROUND_UP(cluster_index, s->refcount_block_size); if (blocks_used > QCOW_MAX_REFTABLE_SIZE / sizeof(uint64_t)) { return -EFBIG; @@ -336,14 +334,14 @@ static int alloc_refcount_block(BlockDriverState *bs, uint64_t table_clusters = size_to_clusters(s, table_size * sizeof(uint64_t)); blocks_clusters = 1 + - ((table_clusters + refcount_block_clusters - 1) - / refcount_block_clusters); + ((table_clusters + s->refcount_block_size - 1) + / s->refcount_block_size); uint64_t meta_clusters = table_clusters + blocks_clusters; last_table_size = table_size; table_size = next_refcount_table_size(s, blocks_used + - ((meta_clusters + refcount_block_clusters - 1) - / refcount_block_clusters)); + ((meta_clusters + s->refcount_block_size - 1) + / s->refcount_block_size)); } while (last_table_size != table_size); @@ -353,7 +351,7 @@ static int alloc_refcount_block(BlockDriverState *bs, #endif /* Create the new refcount table and blocks */ - uint64_t meta_offset = (blocks_used * refcount_block_clusters) * + uint64_t meta_offset = (blocks_used * s->refcount_block_size) * s->cluster_size; uint64_t table_offset = meta_offset + blocks_clusters * s->cluster_size; uint16_t *new_blocks = g_malloc0(blocks_clusters * s->cluster_size); @@ -545,8 +543,7 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs, { int block_index, refcount; int64_t cluster_index = cluster_offset >> s->cluster_bits; - int64_t table_index = - cluster_index >> (s->cluster_bits - REFCOUNT_SHIFT); + int64_t table_index = cluster_index >> s->refcount_block_bits; /* Load the refcount block and allocate it if needed */ if (table_index != old_table_index) { @@ -568,8 +565,7 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs, qcow2_cache_entry_mark_dirty(s->refcount_block_cache, refcount_block); /* we can update the count and save it */ - block_index = cluster_index & - ((1 << (s->cluster_bits - REFCOUNT_SHIFT)) - 1); + block_index = cluster_index & (s->refcount_block_size - 1); refcount = be16_to_cpu(refcount_block[block_index]); refcount += addend; diff --git a/block/qcow2.c b/block/qcow2.c index 6c3c6bc..4e60077 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1678,7 +1678,7 @@ static int qcow2_create2(const char *filename, int64_t total_size, .l1_size = cpu_to_be32(0), .refcount_table_offset = cpu_to_be64(cluster_size), .refcount_table_clusters = cpu_to_be32(1), - .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), + .refcount_order = cpu_to_be32(4), .header_length = cpu_to_be32(sizeof(*header)), }; diff --git a/block/qcow2.h b/block/qcow2.h index b65f629..b210a7f 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -59,8 +59,6 @@ /* The cluster reads as all zeros */ #define QCOW_OFLAG_ZERO (1LL << 0) -#define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */ - #define MIN_CLUSTER_BITS 9 #define MAX_CLUSTER_BITS 21 -- 1.8.3.1