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Blame SOURCES/kvm-raw-posix-implement-write_zeroes-with-MAY_UNMAP-for-.patch.patch.patch.patch

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From 4a5025f224c53d2194e2f62cb730a1fef961ff45 Mon Sep 17 00:00:00 2001
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Message-Id: <4a5025f224c53d2194e2f62cb730a1fef961ff45.1389014116.git.minovotn@redhat.com>
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In-Reply-To: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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References: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 9 Dec 2013 14:09:27 +0100
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Subject: [PATCH 39/50] raw-posix: implement write_zeroes with MAY_UNMAP for
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 files
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-42-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56078
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 41/52] raw-posix: implement write_zeroes with MAY_UNMAP for files
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Bugzilla: 1007815
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Writing zeroes to a file can be done by punching a hole if
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MAY_UNMAP is set.
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Note that in this case ENOTSUP is not ignored, but makes
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the block layer fall back to the generic implementation.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 260a82e524b7f86c12b8e39d4c3f208af95645f7)
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---
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 block/raw-posix.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
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 trace-events      |  1 +
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 2 files changed, 65 insertions(+), 2 deletions(-)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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 block/raw-posix.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
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 trace-events      |  1 +
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 2 files changed, 65 insertions(+), 2 deletions(-)
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diff --git a/block/raw-posix.c b/block/raw-posix.c
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index 7a140b0..ca5bcb3 100644
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--- a/block/raw-posix.c
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+++ b/block/raw-posix.c
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@@ -139,9 +139,10 @@ typedef struct BDRVRawState {
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     void *aio_ctx;
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 #endif
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 #ifdef CONFIG_XFS
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-    bool is_xfs : 1;
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+    bool is_xfs:1;
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 #endif
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-    bool has_discard : 1;
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+    bool has_discard:1;
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+    bool discard_zeroes:1;
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 } BDRVRawState;
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 typedef struct BDRVRawReopenState {
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@@ -283,6 +284,7 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
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     Error *local_err = NULL;
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     const char *filename;
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     int fd, ret;
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+    struct stat st;
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     opts = qemu_opts_create_nofail(&raw_runtime_opts);
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     qemu_opts_absorb_qdict(opts, options, &local_err);
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@@ -325,6 +327,15 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
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 #endif
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     s->has_discard = true;
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+
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+    if (fstat(s->fd, &st) < 0) {
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+        error_setg_errno(errp, errno, "Could not stat file");
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+        goto fail;
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+    }
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+    if (S_ISREG(st.st_mode)) {
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+        s->discard_zeroes = true;
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+    }
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+
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 #ifdef CONFIG_XFS
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     if (platform_test_xfs_fd(s->fd)) {
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         s->is_xfs = true;
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@@ -788,6 +799,29 @@ static int aio_worker(void *arg)
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     return ret;
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 }
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+static int paio_submit_co(BlockDriverState *bs, int fd,
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+        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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+        int type)
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+{
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+    RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
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+    ThreadPool *pool;
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+
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+    acb->bs = bs;
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+    acb->aio_type = type;
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+    acb->aio_fildes = fd;
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+
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+    if (qiov) {
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+        acb->aio_iov = qiov->iov;
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+        acb->aio_niov = qiov->niov;
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+    }
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+    acb->aio_nbytes = nb_sectors * 512;
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+    acb->aio_offset = sector_num * 512;
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+
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+    trace_paio_submit_co(sector_num, nb_sectors, type);
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+    pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
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+    return thread_pool_submit_co(pool, aio_worker, acb);
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+}
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+
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 static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
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         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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         BlockDriverCompletionFunc *cb, void *opaque, int type)
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@@ -1200,6 +1234,31 @@ static coroutine_fn BlockDriverAIOCB *raw_aio_discard(BlockDriverState *bs,
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                        cb, opaque, QEMU_AIO_DISCARD);
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 }
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+static int coroutine_fn raw_co_write_zeroes(
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+    BlockDriverState *bs, int64_t sector_num,
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+    int nb_sectors, BdrvRequestFlags flags)
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+{
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+    BDRVRawState *s = bs->opaque;
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+
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+    if (!(flags & BDRV_REQ_MAY_UNMAP)) {
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+        return -ENOTSUP;
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+    }
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+    if (!s->discard_zeroes) {
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+        return -ENOTSUP;
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+    }
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+    return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
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+                          QEMU_AIO_DISCARD);
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+}
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+
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+static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
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+{
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+    BDRVRawState *s = bs->opaque;
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+
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+    bdi->unallocated_blocks_are_zero = s->discard_zeroes;
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+    bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
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+    return 0;
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+}
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+
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 static QEMUOptionParameter raw_create_options[] = {
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     {
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         .name = BLOCK_OPT_SIZE,
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@@ -1222,6 +1281,7 @@ static BlockDriver bdrv_file = {
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     .bdrv_create = raw_create,
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     .bdrv_has_zero_init = bdrv_has_zero_init_1,
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     .bdrv_co_get_block_status = raw_co_get_block_status,
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+    .bdrv_co_write_zeroes = raw_co_write_zeroes,
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     .bdrv_aio_readv = raw_aio_readv,
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     .bdrv_aio_writev = raw_aio_writev,
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@@ -1230,6 +1290,7 @@ static BlockDriver bdrv_file = {
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     .bdrv_truncate = raw_truncate,
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     .bdrv_getlength = raw_getlength,
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+    .bdrv_get_info = raw_get_info,
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     .bdrv_get_allocated_file_size
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                         = raw_get_allocated_file_size,
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@@ -1584,6 +1645,7 @@ static BlockDriver bdrv_host_device = {
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     .bdrv_truncate      = raw_truncate,
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     .bdrv_getlength	= raw_getlength,
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+    .bdrv_get_info = raw_get_info,
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     .bdrv_get_allocated_file_size
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                         = raw_get_allocated_file_size,
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diff --git a/trace-events b/trace-events
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index 40d4312..e9ee94f 100644
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--- a/trace-events
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+++ b/trace-events
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@@ -120,6 +120,7 @@ thread_pool_cancel(void *req, void *opaque) "req %p opaque %p"
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 # block/raw-win32.c
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 # block/raw-posix.c
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+paio_submit_co(int64_t sector_num, int nb_sectors, int type) "sector_num %"PRId64" nb_sectors %d type %d"
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 paio_submit(void *acb, void *opaque, int64_t sector_num, int nb_sectors, int type) "acb %p opaque %p sector_num %"PRId64" nb_sectors %d type %d"
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 # ioport.c
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-- 
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1.7.11.7
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