The implementation of the ATA FLUSH command invokes a flush at the block
layer, which may on raw files on POSIX entail a synchronous fdatasync().
This may in some cases take so long that the SLES 11 SP1 guest driver
reports I/O errors and filesystems get corrupted or remounted read-only.
Avoid this by setting BUSY_STAT, so that the guest is made aware we are
in the middle of an operation and no ATA commands are attempted to be
processed concurrently.
Addresses BNC#637297.
Suggested-by: Gonglei (Arei) <arei.gong...@huawei.com>
Signed-off-by: Andreas Färber <afaer...@suse.de>
---
hw/ide/core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/hw/ide/core.c b/hw/ide/core.c
index c7a8041..bf1ff18 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -795,6 +795,8 @@ static void ide_flush_cb(void *opaque, int ret)
{
IDEState *s = opaque;
+ s->status &= ~BUSY_STAT;
+
if (ret < 0) {
/* XXX: What sector number to set here? */
if (ide_handle_rw_error(s, -ret, BM_STATUS_RETRY_FLUSH)) {
@@ -814,6 +816,7 @@ void ide_flush_cache(IDEState *s)
return;
}
+ s->status |= BUSY_STAT;
bdrv_acct_start(s->bs, &s->acct, 0, BDRV_ACCT_FLUSH);
bdrv_aio_flush(s->bs, ide_flush_cb, s);
}
--
1.8.1.4
