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From 89ef5998670954140a6e605f6a5e6286ee3a5eb2 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Tue, 18 Nov 2014 15:30:18 +0100
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Subject: [PATCH 39/41] raw-posix: raw_co_get_block_status() return value
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Message-id: <1416324620-16229-6-git-send-email-mreitz@redhat.com>
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Patchwork-id: 62440
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O-Subject: [RHEL-7.1/7.0.z qemu-kvm PATCH v3 5/7] raw-posix: raw_co_get_block_status() return value
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Bugzilla: 1160237
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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Instead of generating the full return value thrice in try_fiemap(),
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try_seek_hole() and as a fall-back in raw_co_get_block_status() itself,
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generate the value only in raw_co_get_block_status().
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While at it, also remove the pnum parameter from try_fiemap() and
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try_seek_hole().
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Suggested-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Message-id: 1414148280-17949-3-git-send-email-mreitz@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit d7f62751a14d1d34c7d388431a3e403ef1fe28a5)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/raw-posix.c | 28 ++++++++++++++--------------
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1 file changed, 14 insertions(+), 14 deletions(-)
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diff --git a/block/raw-posix.c b/block/raw-posix.c
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index 75a81b1..a46e50b 100644
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--- a/block/raw-posix.c
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+++ b/block/raw-posix.c
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@@ -1308,12 +1308,12 @@ out:
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return result;
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}
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-static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
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- off_t *hole, int nb_sectors, int *pnum)
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+static int try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
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+ off_t *hole, int nb_sectors)
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{
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#ifdef CONFIG_FIEMAP
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BDRVRawState *s = bs->opaque;
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- int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
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+ int ret = 0;
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struct {
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struct fiemap fm;
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struct fiemap_extent fe;
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@@ -1354,8 +1354,8 @@ static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
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#endif
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}
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-static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
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- off_t *hole, int *pnum)
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+static int try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
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+ off_t *hole)
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{
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#if defined SEEK_HOLE && defined SEEK_DATA
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BDRVRawState *s = bs->opaque;
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@@ -1375,7 +1375,7 @@ static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
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}
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}
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- return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
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+ return 0;
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#else
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return -ENOTSUP;
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#endif
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@@ -1402,7 +1402,7 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
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{
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off_t start, data = 0, hole = 0;
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int64_t total_size;
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- int64_t ret;
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+ int ret;
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ret = fd_open(bs);
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if (ret < 0) {
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@@ -1420,28 +1420,28 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
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nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
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}
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- ret = try_seek_hole(bs, start, &data, &hole, pnum);
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+ ret = try_seek_hole(bs, start, &data, &hole);
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if (ret < 0) {
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- ret = try_fiemap(bs, start, &data, &hole, nb_sectors, pnum);
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+ ret = try_fiemap(bs, start, &data, &hole, nb_sectors);
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if (ret < 0) {
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/* Assume everything is allocated. */
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data = 0;
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hole = start + nb_sectors * BDRV_SECTOR_SIZE;
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- ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
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+ ret = 0;
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}
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}
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+ assert(ret >= 0);
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+
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if (data <= start) {
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/* On a data extent, compute sectors to the end of the extent. */
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*pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
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+ return ret | BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
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} else {
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/* On a hole, compute sectors to the beginning of the next extent. */
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*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
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- ret &= ~BDRV_BLOCK_DATA;
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- ret |= BDRV_BLOCK_ZERO;
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+ return ret | BDRV_BLOCK_ZERO | BDRV_BLOCK_OFFSET_VALID | start;
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}
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-
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- return ret;
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}
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static coroutine_fn BlockDriverAIOCB *raw_aio_discard(BlockDriverState *bs,
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--
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1.8.3.1
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