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Kevin Wolf 250196f19c qcow2: Reduce number of I/O requests 
If the first part of a write request is allocated, but the second isn't
and it can be allocated so that the resulting area is contiguous, handle
it at once. This is a common case for sequential writes.

After this patch, alloc_cluster_offset() only checks if the clusters are
already allocated or how many new clusters can be allocated contigouosly.
The actual cluster allocation is split off into a new function
do_alloc_cluster_offset().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
 		2012-03-12 15:14:07 +01:00
..
blkdebug.c block: replace unchecked strdup/malloc/calloc with glib 2012-01-26 11:39:03 +01:00
blkverify.c block: replace unchecked strdup/malloc/calloc with glib 2012-01-26 11:39:03 +01:00
bochs.c block: take lock around bdrv_read implementations 2011-10-21 17:34:14 +02:00
cloop.c block/cloop: Use g_free instead of free 2011-11-04 14:24:12 +01:00
cow.c block/cow: Return real error code 2011-12-15 12:40:33 +01:00
curl.c block: qemu_aio_get does not return NULL 2011-12-15 12:40:08 +01:00
dmg.c block: take lock around bdrv_read implementations 2011-10-21 17:34:14 +02:00
iscsi.c iSCSI: add configuration variables for iSCSI 2012-02-09 16:17:50 +01:00
nbd.c nbd: add support for NBD_CMD_TRIM 2011-12-22 11:53:57 +01:00
parallels.c block: take lock around bdrv_read implementations 2011-10-21 17:34:14 +02:00
qcow.c qcow: Use bdrv functions to replace file operation 2012-01-26 14:49:18 +01:00
qcow2-cache.c qcow2: Add some tracing 2012-03-12 15:14:06 +01:00
qcow2-cluster.c qcow2: Reduce number of I/O requests 2012-03-12 15:14:07 +01:00
qcow2-refcount.c qcow2: Add qcow2_alloc_clusters_at() 2012-03-12 15:14:07 +01:00
qcow2-snapshot.c qcow2: Allow >4 GB VM state 2011-12-15 12:40:33 +01:00
qcow2.c qcow2: Add error messages in qcow2_truncate 2012-03-12 15:14:06 +01:00
qcow2.h qcow2: Reduce number of I/O requests 2012-03-12 15:14:07 +01:00
qed-check.c Use glib memory allocation and free functions 2011-08-20 23:01:08 -05:00
qed-cluster.c Use glib memory allocation and free functions 2011-08-20 23:01:08 -05:00
qed-gencb.c Use glib memory allocation and free functions 2011-08-20 23:01:08 -05:00
qed-l2-cache.c qed: do not evict in-use L2 table cache entries 2012-03-12 15:14:06 +01:00
qed-table.c block: bdrv_aio_* do not return NULL 2011-12-15 12:40:07 +01:00
qed.c qed: add .bdrv_co_write_zeroes() support 2012-02-09 16:17:50 +01:00
qed.h qed: add .bdrv_co_write_zeroes() support 2012-02-09 16:17:50 +01:00
raw-posix-aio.h prepare for future GPLv2+ relicensing 2012-01-13 10:55:56 -06:00
raw-posix.c block: bdrv_eject(): Make eject_flag a real bool 2012-02-22 17:23:05 -02:00
raw-win32.c block: Rename bdrv_co_flush to bdrv_co_flush_to_disk 2011-11-11 14:02:59 +01:00
raw.c block: bdrv_eject(): Make eject_flag a real bool 2012-02-22 17:23:05 -02:00
rbd.c rbd: wire up snapshot removal and rollback functionality 2012-01-26 11:39:03 +01:00
sheepdog.c sheepdog: fix co_recv coroutine context 2012-02-09 16:17:51 +01:00
stream.c block: add support for partial streaming 2012-01-26 14:49:18 +01:00
vdi.c block/vdi: Zero unused parts when allocating a new block (fix #919242) 2012-01-26 14:49:18 +01:00
vmdk.c block/vmdk: Fix warning from splint (comparision of unsigned value) 2012-03-07 13:03:51 +00:00
vpc.c vpc: Round up image size during fixed image creation 2012-02-09 16:17:51 +01:00
vvfat.c vvfat: avoid leaking file descriptor in commit_one_file() 2012-01-13 10:36:59 +00:00