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| author | Paolo Bonzini <pbonzini@redhat.com> | 2011-10-20 13:16:22 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-10-21 17:34:14 +0200 |
| commit | 2914caa088e3fbbdbfd73106af0cae49af1d472e (patch) | |
| tree | 07d3de39e3839400dd903e53c3a86e5224c58def /block/vvfat.c | |
| parent | 848c66e8f5b631961580f7f010a5831430dc84c2 (diff) | |
| download | qemu-2914caa088e3fbbdbfd73106af0cae49af1d472e.zip qemu-2914caa088e3fbbdbfd73106af0cae49af1d472e.tar.gz qemu-2914caa088e3fbbdbfd73106af0cae49af1d472e.tar.bz2 | |
block: take lock around bdrv_read implementations
This does the first part of the conversion to coroutines, by
wrapping bdrv_read implementations to take the mutex.
Drivers that implement bdrv_read rather than bdrv_co_readv can
then benefit from asynchronous operation (at least if the underlying
protocol supports it, which is not the case for raw-win32), even
though they still operate with a bounce buffer.
raw-win32 does not need the lock, because it cannot yield.
nbd also doesn't probably, but better be safe.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/vvfat.c')
| -rw-r--r-- | block/vvfat.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/block/vvfat.c b/block/vvfat.c index 864bfcf..970cccf 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -1281,6 +1281,17 @@ DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); return 0; } +static coroutine_fn int vvfat_co_read(BlockDriverState *bs, int64_t sector_num, + uint8_t *buf, int nb_sectors) +{ + int ret; + BDRVVVFATState *s = bs->opaque; + qemu_co_mutex_lock(&s->lock); + ret = vvfat_read(bs, sector_num, buf, nb_sectors); + qemu_co_mutex_unlock(&s->lock); + return ret; +} + /* LATER TODO: statify all functions */ /* @@ -2805,7 +2816,7 @@ static BlockDriver bdrv_vvfat = { .format_name = "vvfat", .instance_size = sizeof(BDRVVVFATState), .bdrv_file_open = vvfat_open, - .bdrv_read = vvfat_read, + .bdrv_read = vvfat_co_read, .bdrv_write = vvfat_write, .bdrv_close = vvfat_close, .bdrv_is_allocated = vvfat_is_allocated, |