diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2010-06-18 16:31:14 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2010-06-22 14:38:02 +0200 |
| commit | b0ad5a455d7e5352d4c86ba945112011dbeadfb8 (patch) | |
| tree | 8a39d9508ad5b25ddb4d9cec6957625349587958 | |
| parent | f08145fe16470aca09304099888f68cfbc5d1de7 (diff) | |
| download | qemu-b0ad5a455d7e5352d4c86ba945112011dbeadfb8.zip | |
cow: Use bdrv_(p)write_sync for metadata writes
Use bdrv_(p)write_sync to ensure metadata integrity in case of a crash.
While at it, correct the wrong usage of errno.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/cow.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/block/cow.c b/block/cow.c index d146434181..eedcc48772 100644 --- a/block/cow.c +++ b/block/cow.c @@ -97,17 +97,18 @@ static inline int cow_set_bit(BlockDriverState *bs, int64_t bitnum) { uint64_t offset = sizeof(struct cow_header_v2) + bitnum / 8; uint8_t bitmap; + int ret; - if (bdrv_pread(bs->file, offset, &bitmap, sizeof(bitmap)) != - sizeof(bitmap)) { - return -errno; + ret = bdrv_pread(bs->file, offset, &bitmap, sizeof(bitmap)); + if (ret < 0) { + return ret; } bitmap |= (1 << (bitnum % 8)); - if (bdrv_pwrite(bs->file, offset, &bitmap, sizeof(bitmap)) != - sizeof(bitmap)) { - return -errno; + ret = bdrv_pwrite_sync(bs->file, offset, &bitmap, sizeof(bitmap)); + if (ret < 0) { + return ret; } return 0; } @@ -116,10 +117,11 @@ static inline int is_bit_set(BlockDriverState *bs, int64_t bitnum) { uint64_t offset = sizeof(struct cow_header_v2) + bitnum / 8; uint8_t bitmap; + int ret; - if (bdrv_pread(bs->file, offset, &bitmap, sizeof(bitmap)) != - sizeof(bitmap)) { - return -errno; + ret = bdrv_pread(bs->file, offset, &bitmap, sizeof(bitmap)); + if (ret < 0) { + return ret; } return !!(bitmap & (1 << (bitnum % 8))); |