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[Qemu-devel] [PATCH v2 11/37] block: Remove wr_highest_sector from Block
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH v2 11/37] block: Remove wr_highest_sector from BlockAcctStats |
Date: |
Mon, 9 Feb 2015 12:11:11 -0500 |
BlockAcctStats contains statistics about the data transferred from and
to the device; wr_highest_sector does not fit in with the rest.
Furthermore, those statistics are supposed to be specific for a certain
device and not necessarily for a BDS (see the comment above
bdrv_get_stats()); on the other hand, wr_highest_sector may be a rather
important information to know for each BDS. When BlockAcctStats is
finally removed from the BDS, we will want to keep wr_highest_sector in
the BDS.
Finally, wr_highest_sector is renamed to wr_highest_offset and given the
appropriate meaning. Externally, it is represented as an offset so there
is no point in doing something different internally. Its definition is
changed to match that in qapi/block-core.json which is "the offset after
the greatest byte written to". Doing so should not cause any harm since
if external programs tried to calculate the volume usage by
(wr_highest_offset + 512) / volume_size, after this patch they will just
assume the volume to be full slightly earlier than before.
Signed-off-by: Max Reitz <address@hidden>
---
block.c | 4 +++-
block/accounting.c | 8 --------
block/qapi.c | 4 ++--
include/block/accounting.h | 3 ---
include/block/block_int.h | 3 +++
qmp-commands.hx | 4 ++--
6 files changed, 10 insertions(+), 16 deletions(-)
diff --git a/block.c b/block.c
index 7de03e5..4f924c6 100644
--- a/block.c
+++ b/block.c
@@ -3311,7 +3311,9 @@ static int coroutine_fn
bdrv_aligned_pwritev(BlockDriverState *bs,
bdrv_set_dirty(bs, sector_num, nb_sectors);
- block_acct_highest_sector(&bs->stats, sector_num, nb_sectors);
+ if (bs->wr_highest_offset < offset + bytes) {
+ bs->wr_highest_offset = offset + bytes;
+ }
if (ret >= 0) {
bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors);
diff --git a/block/accounting.c b/block/accounting.c
index 01d594f..a423560 100644
--- a/block/accounting.c
+++ b/block/accounting.c
@@ -47,14 +47,6 @@ void block_acct_done(BlockAcctStats *stats, BlockAcctCookie
*cookie)
}
-void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
- unsigned int nb_sectors)
-{
- if (stats->wr_highest_sector < sector_num + nb_sectors - 1) {
- stats->wr_highest_sector = sector_num + nb_sectors - 1;
- }
-}
-
void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
int num_requests)
{
diff --git a/block/qapi.c b/block/qapi.c
index 1808e67..9b27658 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -340,13 +340,13 @@ static BlockStats *bdrv_query_stats(const
BlockDriverState *bs,
s->stats->wr_operations = bs->stats.nr_ops[BLOCK_ACCT_WRITE];
s->stats->rd_merged = bs->stats.merged[BLOCK_ACCT_READ];
s->stats->wr_merged = bs->stats.merged[BLOCK_ACCT_WRITE];
- s->stats->wr_highest_offset =
- bs->stats.wr_highest_sector * BDRV_SECTOR_SIZE;
s->stats->flush_operations = bs->stats.nr_ops[BLOCK_ACCT_FLUSH];
s->stats->wr_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_WRITE];
s->stats->rd_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_READ];
s->stats->flush_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_FLUSH];
+ s->stats->wr_highest_offset = bs->wr_highest_offset;
+
if (bs->file) {
s->has_parent = true;
s->parent = bdrv_query_stats(bs->file, query_backing);
diff --git a/include/block/accounting.h b/include/block/accounting.h
index 4c406cf..66637cd 100644
--- a/include/block/accounting.h
+++ b/include/block/accounting.h
@@ -40,7 +40,6 @@ typedef struct BlockAcctStats {
uint64_t nr_ops[BLOCK_MAX_IOTYPE];
uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
uint64_t merged[BLOCK_MAX_IOTYPE];
- uint64_t wr_highest_sector;
} BlockAcctStats;
typedef struct BlockAcctCookie {
@@ -52,8 +51,6 @@ typedef struct BlockAcctCookie {
void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
int64_t bytes, enum BlockAcctType type);
void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
-void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
- unsigned int nb_sectors);
void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
int num_requests);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 4e7945c..098d1ab 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -366,6 +366,9 @@ struct BlockDriverState {
/* I/O stats (display with "info blockstats"). */
BlockAcctStats stats;
+ /* Offset after the highest byte written to */
+ uint64_t wr_highest_offset;
+
/* I/O Limits */
BlockLimits bl;
diff --git a/qmp-commands.hx b/qmp-commands.hx
index a85d847..9001792 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2304,8 +2304,8 @@ Each json-object contain the following:
- "wr_total_time_ns": total time spend on writes in nano-seconds (json-int)
- "rd_total_time_ns": total time spend on reads in nano-seconds (json-int)
- "flush_total_time_ns": total time spend on cache flushes in nano-seconds
(json-int)
- - "wr_highest_offset": Highest offset of a sector written since the
- BlockDriverState has been opened (json-int)
+ - "wr_highest_offset": The offset after the greatest byte written to the
+ BlockDriverState since it has been opened (json-int)
- "rd_merged": number of read requests that have been merged into
another request (json-int)
- "wr_merged": number of write requests that have been merged into
--
2.1.0
- [Qemu-devel] [PATCH v2 01/37] blockdev: Allow creation of BDS trees without BB, (continued)
- [Qemu-devel] [PATCH v2 01/37] blockdev: Allow creation of BDS trees without BB, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 03/37] hw/block/fdc: Implement tray status, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 02/37] iotests: Only create BB if necessary, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 08/37] block: Make bdrv_is_inserted() recursive, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 10/37] block: Move guest_block_size into BlockBackend, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 09/37] block/quorum: Implement bdrv_is_inserted(), Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 11/37] block: Remove wr_highest_sector from BlockAcctStats,
Max Reitz <=
- [Qemu-devel] [PATCH v2 17/37] block: Prepare remaining BB functions for NULL BDS, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 14/37] block: Add BlockBackendRootState, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 18/37] blockdev: Use BB for blockdev-backup transaction, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 16/37] block: Fail requests to empty BlockBackend, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 13/37] block: Move I/O status and error actions into BB, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 15/37] block: Make some BB functions fall back to BBRS, Max Reitz, 2015/02/09
- [Qemu-devel] [PATCH v2 19/37] block: Add blk_insert_bs(), Max Reitz, 2015/02/09