diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 52 |
1 files changed, 37 insertions, 15 deletions
@@ -239,12 +239,6 @@ bool bdrv_is_read_only(BlockDriverState *bs) return bs->read_only; } -/* Returns whether the image file can be written to right now */ -bool bdrv_is_writable(BlockDriverState *bs) -{ - return !bdrv_is_read_only(bs) && !(bs->open_flags & BDRV_O_INACTIVE); -} - int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, bool ignore_allow_rdw, Error **errp) { @@ -1537,6 +1531,41 @@ static int bdrv_child_check_perm(BdrvChild *c, BlockReopenQueue *q, static void bdrv_child_abort_perm_update(BdrvChild *c); static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared); +typedef struct BlockReopenQueueEntry { + bool prepared; + BDRVReopenState state; + QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; +} BlockReopenQueueEntry; + +/* + * Return the flags that @bs will have after the reopens in @q have + * successfully completed. If @q is NULL (or @bs is not contained in @q), + * return the current flags. + */ +static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) +{ + BlockReopenQueueEntry *entry; + + if (q != NULL) { + QSIMPLEQ_FOREACH(entry, q, entry) { + if (entry->state.bs == bs) { + return entry->state.flags; + } + } + } + + return bs->open_flags; +} + +/* Returns whether the image file can be written to after the reopen queue @q + * has been successfully applied, or right now if @q is NULL. */ +static bool bdrv_is_writable(BlockDriverState *bs, BlockReopenQueue *q) +{ + int flags = bdrv_reopen_get_flags(q, bs); + + return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; +} + static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, BdrvChild *c, const BdrvChildRole *role, BlockReopenQueue *reopen_queue, @@ -1574,7 +1603,7 @@ static int bdrv_check_perm(BlockDriverState *bs, BlockReopenQueue *q, /* Write permissions never work with read-only images */ if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && - !bdrv_is_writable(bs)) + !bdrv_is_writable(bs, q)) { error_setg(errp, "Block node is read-only"); return -EPERM; @@ -1864,8 +1893,7 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, &perm, &shared); /* Format drivers may touch metadata even if the guest doesn't write */ - /* TODO Take flags from reopen_queue */ - if (bdrv_is_writable(bs)) { + if (bdrv_is_writable(bs, reopen_queue)) { perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; } @@ -2642,12 +2670,6 @@ BlockDriverState *bdrv_open(const char *filename, const char *reference, NULL, errp); } -typedef struct BlockReopenQueueEntry { - bool prepared; - BDRVReopenState state; - QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; -} BlockReopenQueueEntry; - /* * Adds a BlockDriverState to a simple queue for an atomic, transactional * reopen of multiple devices. |