diff options
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 5e5f4132d9..fe915681b2 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -272,6 +272,37 @@ static int qcow2_mark_clean(BlockDriverState *bs) return 0; } +/* + * Marks the image as corrupt. + */ +int qcow2_mark_corrupt(BlockDriverState *bs) +{ + BDRVQcowState *s = bs->opaque; + + s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; + return qcow2_update_header(bs); +} + +/* + * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes + * before if necessary. + */ +int qcow2_mark_consistent(BlockDriverState *bs) +{ + BDRVQcowState *s = bs->opaque; + + if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { + int ret = bdrv_flush(bs); + if (ret < 0) { + return ret; + } + + s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; + return qcow2_update_header(bs); + } + return 0; +} + static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix) { @@ -402,6 +433,17 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags) goto fail; } + if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { + /* Corrupt images may not be written to unless they are being repaired + */ + if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { + error_report("qcow2: Image is corrupt; cannot be opened " + "read/write."); + ret = -EACCES; + goto fail; + } + } + /* Check support for various header values */ if (header.refcount_order != 4) { report_unsupported(bs, "%d bit reference counts", @@ -1130,6 +1172,11 @@ int qcow2_update_header(BlockDriverState *bs) .name = "dirty bit", }, { + .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, + .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, + .name = "corrupt bit", + }, + { .type = QCOW2_FEAT_TYPE_COMPATIBLE, .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, .name = "lazy refcounts", |