From: João Silva
The fstat call can take a long time to finish when running over
NFS. Add a version of it that runs in the thread pool.
Adapt one of its users, raw_co_get_allocated_file size to use the new
version. That function is called via QMP under the qemu_global_mutex
so it has a large chance of blocking VCPU threads in case it takes too
long to finish.
Reviewed-by: Claudio Fontana
Signed-off-by: João Silva
Signed-off-by: Fabiano Rosas
---
block/file-posix.c | 40 +---
include/block/raw-aio.h | 4 +++-
2 files changed, 40 insertions(+), 4 deletions(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index ac1ed54811..45232dc0f9 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -227,6 +227,9 @@ typedef struct RawPosixAIOData {
struct {
unsigned long op;
} zone_mgmt;
+struct {
+struct stat *st;
+} fstat;
};
} RawPosixAIOData;
@@ -2614,6 +2617,34 @@ static void raw_close(BlockDriverState *bs)
}
}
+static int handle_aiocb_fstat(void *opaque)
+{
+RawPosixAIOData *aiocb = opaque;
+
+if (fstat(aiocb->aio_fildes, aiocb->fstat.st) < 0) {
+return -errno;
+}
+
+return 0;
+}
+
+static int coroutine_fn raw_co_fstat(BlockDriverState *bs, struct stat *st)
+{
+BDRVRawState *s = bs->opaque;
+RawPosixAIOData acb;
+
+acb = (RawPosixAIOData) {
+.bs = bs,
+.aio_fildes = s->fd,
+.aio_type = QEMU_AIO_FSTAT,
+.fstat = {
+.st = st,
+},
+};
+
+return raw_thread_pool_submit(handle_aiocb_fstat, );
+}
+
/**
* Truncates the given regular file @fd to @offset and, when growing, fills the
* new space according to @prealloc.
@@ -2853,11 +2884,14 @@ static int64_t coroutine_fn
raw_co_getlength(BlockDriverState *bs)
static int64_t coroutine_fn raw_co_get_allocated_file_size(BlockDriverState
*bs)
{
struct stat st;
-BDRVRawState *s = bs->opaque;
+int ret;
-if (fstat(s->fd, ) < 0) {
-return -errno;
+ret = raw_co_fstat(bs, );
+
+if (ret) {
+return ret;
}
+
return (int64_t)st.st_blocks * 512;
}
diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h
index 0f63c2800c..1f2c678461 100644
--- a/include/block/raw-aio.h
+++ b/include/block/raw-aio.h
@@ -31,6 +31,7 @@
#define QEMU_AIO_ZONE_REPORT 0x0100
#define QEMU_AIO_ZONE_MGMT0x0200
#define QEMU_AIO_ZONE_APPEND 0x0400
+#define QEMU_AIO_FSTAT0x0800
#define QEMU_AIO_TYPE_MASK \
(QEMU_AIO_READ | \
QEMU_AIO_WRITE | \
@@ -42,7 +43,8 @@
QEMU_AIO_TRUNCATE | \
QEMU_AIO_ZONE_REPORT | \
QEMU_AIO_ZONE_MGMT | \
- QEMU_AIO_ZONE_APPEND)
+ QEMU_AIO_ZONE_APPEND | \
+ QEMU_AIO_FSTAT)
/* AIO flags */
#define QEMU_AIO_MISALIGNED 0x1000
--
2.35.3
