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Block layer patches for 2.8.0-rc2

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Merge remote-tracking branch 'kwolf/tags/for-upstream' into staging

Block layer patches for 2.8.0-rc2

# gpg: Signature made Tue 29 Nov 2016 03:16:10 PM GMT
# gpg:                using RSA key 0x7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* kwolf/tags/for-upstream:
  docs: Specify that cache-clean-interval is only supported in Linux
  qcow2: Remove stale comment
  qcow2: Allow 'cache-clean-interval' in Linux only
  qcow2: Make qcow2_cache_table_release() work only in Linux

Message-id: 1480436227-2211-1-git-send-email-kwolf@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2016-11-29 17:06:38 +00:00
parent 7ecf44a579 8f57758311
commit f05234df63
3 changed files with 14 additions and 5 deletions
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6
block/qcow2-cache.c
View file

@ -22,7 +22,6 @@
* THE SOFTWARE.
*/
/* Needed for CONFIG_MADVISE */
#include "qemu/osdep.h"
#include "block/block_int.h"
#include "qemu-common.h"
@ -66,7 +65,8 @@ static inline int qcow2_cache_get_table_idx(BlockDriverState *bs,
static void qcow2_cache_table_release(BlockDriverState *bs, Qcow2Cache *c,
int i, int num_tables)
{
#if QEMU_MADV_DONTNEED != QEMU_MADV_INVALID
/* Using MADV_DONTNEED to discard memory is a Linux-specific feature */
#ifdef CONFIG_LINUX
BDRVQcow2State *s = bs->opaque;
void *t = qcow2_cache_get_table_addr(bs, c, i);
int align = getpagesize();
@ -74,7 +74,7 @@ static void qcow2_cache_table_release(BlockDriverState *bs, Qcow2Cache *c,
size_t offset = QEMU_ALIGN_UP((uintptr_t) t, align) - (uintptr_t) t;
size_t length = QEMU_ALIGN_DOWN(mem_size - offset, align);
if (length > 0) {
qemu_madvise((uint8_t *) t + offset, length, QEMU_MADV_DONTNEED);
madvise((uint8_t *) t + offset, length, MADV_DONTNEED);
}
#endif
}

8
block/qcow2.c
View file

@ -668,6 +668,14 @@ static int qcow2_update_options_prepare(BlockDriverState *bs,
r->cache_clean_interval =
qemu_opt_get_number(opts, QCOW2_OPT_CACHE_CLEAN_INTERVAL,
s->cache_clean_interval);
#ifndef CONFIG_LINUX
if (r->cache_clean_interval != 0) {
error_setg(errp, QCOW2_OPT_CACHE_CLEAN_INTERVAL
" not supported on this host");
ret = -EINVAL;
goto fail;
}
#endif
if (r->cache_clean_interval > UINT_MAX) {
error_setg(errp, "Cache clean interval too big");
ret = -EINVAL;

5
docs/qcow2-cache.txt
View file

@ -160,5 +160,6 @@ If unset, the default value for this parameter is 0 and it disables
this feature.
Note that this functionality currently relies on the MADV_DONTNEED
argument for madvise() to actually free the memory, so it is not
useful in systems that don't follow that behavior.
argument for madvise() to actually free the memory. This is a
Linux-specific feature, so cache-clean-interval is not supported in
other systems.