From 4ab1559085d688dddf4de77f1ead3102e243e668 Mon Sep 17 00:00:00 2001 From: Chunyan Liu Date: Mon, 30 Jun 2014 14:29:58 +0800 Subject: qemu-img create: add 'nocow' option Add 'nocow' option so that users could have a chance to set NOCOW flag to newly created files. It's useful on btrfs file system to enhance performance. Btrfs has low performance when hosting VM images, even more when the guest in those VM are also using btrfs as file system. One way to mitigate this bad performance is to turn off COW attributes on VM files. Generally, there are two ways to turn off NOCOW on btrfs: a) by mounting fs with nodatacow, then all newly created files will be NOCOW. b) per file. Add the NOCOW file attribute. It could only be done to empty or new files. This patch tries the second way, according to the option, it could add NOCOW per file. For most block drivers, since the create file step is in raw-posix.c, so we can do setting NOCOW flag ioctl in raw-posix.c only. But there are some exceptions, like block/vpc.c and block/vdi.c, they are creating file by calling qemu_open directly. For them, do the same setting NOCOW flag ioctl work in them separately. [Fixed up 082.out due to the new 'nocow' creation option --Stefan] Signed-off-by: Chunyan Liu Signed-off-by: Stefan Hajnoczi --- block/qed.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'block/qed.c') diff --git a/block/qed.c b/block/qed.c index eddae929eb..b69374b6a2 100644 --- a/block/qed.c +++ b/block/qed.c @@ -567,7 +567,7 @@ static void bdrv_qed_close(BlockDriverState *bs) static int qed_create(const char *filename, uint32_t cluster_size, uint64_t image_size, uint32_t table_size, const char *backing_file, const char *backing_fmt, - Error **errp) + QemuOpts *opts, Error **errp) { QEDHeader header = { .magic = QED_MAGIC, @@ -586,7 +586,7 @@ static int qed_create(const char *filename, uint32_t cluster_size, int ret = 0; BlockDriverState *bs; - ret = bdrv_create_file(filename, NULL, &local_err); + ret = bdrv_create_file(filename, opts, &local_err); if (ret < 0) { error_propagate(errp, local_err); return ret; @@ -682,7 +682,7 @@ static int bdrv_qed_create(const char *filename, QemuOpts *opts, Error **errp) } ret = qed_create(filename, cluster_size, image_size, table_size, - backing_file, backing_fmt, errp); + backing_file, backing_fmt, opts, errp); finish: g_free(backing_file); -- cgit v1.2.3