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[Qemu-devel] [PATCH 8/8] block/raw-posix: set max_write_zeroes to INT_MA
From: |
Denis V. Lunev |
Subject: |
[Qemu-devel] [PATCH 8/8] block/raw-posix: set max_write_zeroes to INT_MAX for regular files |
Date: |
Tue, 30 Dec 2014 12:20:50 +0300 |
fallocate() works fine and could handle properly with arbitrary size
requests. There is no sense to reduce the amount of space to fallocate.
The bigger the size, the better is performance as the amount of journal
updates is reduced.
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Kevin Wolf <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Peter Lieven <address@hidden>
---
block/raw-posix.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 57b94ad..3e156c4 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -292,6 +292,20 @@ static void raw_probe_alignment(BlockDriverState *bs, int
fd, Error **errp)
}
}
+static void raw_probe_max_write_zeroes(BlockDriverState *bs)
+{
+ BDRVRawState *s = bs->opaque;
+ struct stat st;
+
+ if (fstat(s->fd, &st) < 0) {
+ return; /* no problem, keep default value */
+ }
+ if (!S_ISREG(st.st_mode) || !s->discard_zeroes) {
+ return;
+ }
+ bs->bl.max_write_zeroes = INT_MAX;
+}
+
static void raw_parse_flags(int bdrv_flags, int *open_flags)
{
assert(open_flags != NULL);
@@ -598,6 +612,7 @@ static int raw_reopen_prepare(BDRVReopenState *state,
/* Fail already reopen_prepare() if we can't get a working O_DIRECT
* alignment with the new fd. */
if (raw_s->fd != -1) {
+ raw_probe_max_write_zeroes(state->bs);
raw_probe_alignment(state->bs, raw_s->fd, &local_err);
if (local_err) {
qemu_close(raw_s->fd);
@@ -651,6 +666,8 @@ static void raw_refresh_limits(BlockDriverState *bs, Error
**errp)
raw_probe_alignment(bs, s->fd, errp);
bs->bl.opt_mem_alignment = s->buf_align;
+
+ raw_probe_max_write_zeroes(bs);
}
static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
--
1.9.1
- [Qemu-devel] [PATCH v3 0/8] eliminate data write in bdrv_write_zeroes on Linux in raw-posix.c, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 8/8] block/raw-posix: set max_write_zeroes to INT_MAX for regular files,
Denis V. Lunev <=
- [Qemu-devel] [PATCH 7/8] block/raw-posix: call plain fallocate in handle_aiocb_write_zeroes, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 1/8] block: prepare bdrv_co_do_write_zeroes to deal with large bl.max_write_zeroes, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 5/8] block/raw-posix: refactor handle_aiocb_write_zeroes a bit, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 6/8] block: use fallocate(FALLOC_FL_PUNCH_HOLE) & fallocate(0) to write zeroes, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 2/8] block: use fallocate(FALLOC_FL_ZERO_RANGE) in handle_aiocb_write_zeroes, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 3/8] block/raw-posix: create do_fallocate helper, Denis V. Lunev, 2014/12/30
- [Qemu-devel] [PATCH 4/8] block/raw-posix: create translate_err helper to merge errno values, Denis V. Lunev, 2014/12/30
- Re: [Qemu-devel] [PATCH v3 0/8] eliminate data write in bdrv_write_zeroes on Linux in raw-posix.c, Peter Lieven, 2014/12/30