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