if (path_is_absolute(filename)) {
pstrcpy(dest, dest_size, filename);
} else {
- p = strchr(base_path, ':');
- if (p)
- p++;
- else
- p = base_path;
+ const char *protocol_stripped = NULL;
+
+ if (path_has_protocol(base_path)) {
+ protocol_stripped = strchr(base_path, ':');
+ if (protocol_stripped) {
+ protocol_stripped++;
+ }
+ }
+ p = protocol_stripped ?: base_path;
+
p1 = strrchr(base_path, '/');
#ifdef _WIN32
{
}
}
+/*
+ * Helper function for bdrv_parse_filename() implementations to remove optional
+ * protocol prefixes (especially "file:") from a filename and for putting the
+ * stripped filename into the options QDict if there is such a prefix.
+ */
+void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix,
+ QDict *options)
+{
+ if (strstart(filename, prefix, &filename)) {
+ /* Stripping the explicit protocol prefix may result in a protocol
+ * prefix being (wrongly) detected (if the filename contains a colon) */
+ if (path_has_protocol(filename)) {
+ QString *fat_filename;
+
+ /* This means there is some colon before the first slash; therefore,
+ * this cannot be an absolute path */
+ assert(!path_is_absolute(filename));
+
+ /* And we can thus fix the protocol detection issue by prefixing it
+ * by "./" */
+ fat_filename = qstring_from_str("./");
+ qstring_append(fat_filename, filename);
+
+ assert(!path_has_protocol(qstring_get_str(fat_filename)));
+
+ qdict_put(options, "filename", fat_filename);
+ } else {
+ /* If no protocol prefix was detected, we can use the shortened
+ * filename as-is */
+ qdict_put_str(options, "filename", filename);
+ }
+ }
+}
+
+
+/* Returns whether the image file is opened as read-only. Note that this can
+ * return false and writing to the image file is still not possible because the
+ * image is inactivated. */
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, Error **errp)
{
/* Do not set read_only if copy_on_read is enabled */
QLIST_INIT(&bs->op_blockers[i]);
}
notifier_with_return_list_init(&bs->before_write_notifiers);
+ qemu_co_mutex_init(&bs->reqs_lock);
+ qemu_mutex_init(&bs->dirty_bitmap_mutex);
bs->refcnt = 1;
bs->aio_context = qemu_get_aio_context();
bdrv_drained_end(bs);
}
+static int bdrv_child_cb_inactivate(BdrvChild *child)
+{
+ BlockDriverState *bs = child->opaque;
+ assert(bs->open_flags & BDRV_O_INACTIVE);
+ return 0;
+}
+
/*
* Returns the options and flags that a temporary snapshot should get, based on
* the originally requested flags (the originally requested image will have
.inherit_options = bdrv_inherited_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
/*
.inherit_options = bdrv_inherited_fmt_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
static void bdrv_backing_attach(BdrvChild *c)
.inherit_options = bdrv_backing_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
static int bdrv_open_flags(BlockDriverState *bs, int flags)
goto fail_opts;
}
- assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
+ /* bdrv_new() and bdrv_close() make it so */
+ assert(atomic_read(&bs->copy_on_read) == 0);
+
if (bs->open_flags & BDRV_O_COPY_ON_READ) {
if (!bs->read_only) {
bdrv_enable_copy_on_read(bs);
/* Write permissions never work with read-only images */
if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) &&
- bdrv_is_read_only(bs))
+ !bdrv_is_writable(bs))
{
error_setg(errp, "Block node is read-only");
return -EPERM;
bdrv_filter_default_perms(bs, c, role, perm, shared, &perm, &shared);
/* Format drivers may touch metadata even if the guest doesn't write */
- if (!bdrv_is_read_only(bs)) {
+ if (bdrv_is_writable(bs)) {
perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
}
BLK_PERM_WRITE_UNCHANGED;
}
+ if (bs->open_flags & BDRV_O_INACTIVE) {
+ shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
+ }
+
*nperm = perm;
*nshared = shared;
}
ret = -EINVAL;
goto free_exit;
}
+ bdrv_set_aio_context(backing_hd, bdrv_get_aio_context(bs));
/* Hook up the backing file link; drop our reference, bs owns the
* backing_hd reference now */
goto close_and_fail;
}
- if (!bdrv_key_required(bs)) {
- bdrv_parent_cb_change_media(bs, true);
- } else if (!runstate_check(RUN_STATE_PRELAUNCH)
- && !runstate_check(RUN_STATE_INMIGRATE)
- && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */
- error_setg(errp,
- "Guest must be stopped for opening of encrypted image");
- goto close_and_fail;
- }
+ bdrv_parent_cb_change_media(bs, true);
QDECREF(options);
void bdrv_reopen_commit(BDRVReopenState *reopen_state)
{
BlockDriver *drv;
+ BlockDriverState *bs;
+ bool old_can_write, new_can_write;
assert(reopen_state != NULL);
- drv = reopen_state->bs->drv;
+ bs = reopen_state->bs;
+ drv = bs->drv;
assert(drv != NULL);
+ old_can_write =
+ !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE);
+
/* If there are any driver level actions to take */
if (drv->bdrv_reopen_commit) {
drv->bdrv_reopen_commit(reopen_state);
}
/* set BDS specific flags now */
- QDECREF(reopen_state->bs->explicit_options);
+ QDECREF(bs->explicit_options);
- reopen_state->bs->explicit_options = reopen_state->explicit_options;
- reopen_state->bs->open_flags = reopen_state->flags;
- reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR);
+ bs->explicit_options = reopen_state->explicit_options;
+ bs->open_flags = reopen_state->flags;
+ bs->read_only = !(reopen_state->flags & BDRV_O_RDWR);
- bdrv_refresh_limits(reopen_state->bs, NULL);
+ bdrv_refresh_limits(bs, NULL);
+
+ new_can_write =
+ !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE);
+ if (!old_can_write && new_can_write && drv->bdrv_reopen_bitmaps_rw) {
+ Error *local_err = NULL;
+ if (drv->bdrv_reopen_bitmaps_rw(bs, &local_err) < 0) {
+ /* This is not fatal, bitmaps just left read-only, so all following
+ * writes will fail. User can remove read-only bitmaps to unblock
+ * writes.
+ */
+ error_reportf_err(local_err,
+ "%s: Failed to make dirty bitmaps writable: ",
+ bdrv_get_node_name(bs));
+ }
+ }
}
/*
bdrv_flush(bs);
bdrv_drain(bs); /* in case flush left pending I/O */
- bdrv_release_named_dirty_bitmaps(bs);
- assert(QLIST_EMPTY(&bs->dirty_bitmaps));
-
if (bs->drv) {
BdrvChild *child, *next;
g_free(bs->opaque);
bs->opaque = NULL;
- bs->copy_on_read = 0;
+ atomic_set(&bs->copy_on_read, 0);
bs->backing_file[0] = '\0';
bs->backing_format[0] = '\0';
bs->total_sectors = 0;
bs->encrypted = false;
- bs->valid_key = false;
bs->sg = false;
QDECREF(bs->options);
QDECREF(bs->explicit_options);
bs->full_open_options = NULL;
}
+ bdrv_release_named_dirty_bitmaps(bs);
+ assert(QLIST_EMPTY(&bs->dirty_bitmaps));
+
QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) {
g_free(ban);
}
/**
* Truncate file to 'offset' bytes (needed only for file protocols)
*/
-int bdrv_truncate(BdrvChild *child, int64_t offset, Error **errp)
+int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc,
+ Error **errp)
{
BlockDriverState *bs = child->bs;
BlockDriver *drv = bs->drv;
assert(!(bs->open_flags & BDRV_O_INACTIVE));
- ret = drv->bdrv_truncate(bs, offset, errp);
+ ret = drv->bdrv_truncate(bs, offset, prealloc, errp);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
bdrv_dirty_bitmap_truncate(bs);
bdrv_parent_cb_resize(bs);
- ++bs->write_gen;
+ atomic_inc(&bs->write_gen);
}
return ret;
}
return -ENOTSUP;
}
+/*
+ * bdrv_measure:
+ * @drv: Format driver
+ * @opts: Creation options for new image
+ * @in_bs: Existing image containing data for new image (may be NULL)
+ * @errp: Error object
+ * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo())
+ * or NULL on error
+ *
+ * Calculate file size required to create a new image.
+ *
+ * If @in_bs is given then space for allocated clusters and zero clusters
+ * from that image are included in the calculation. If @opts contains a
+ * backing file that is shared by @in_bs then backing clusters may be omitted
+ * from the calculation.
+ *
+ * If @in_bs is NULL then the calculation includes no allocated clusters
+ * unless a preallocation option is given in @opts.
+ *
+ * Note that @in_bs may use a different BlockDriver from @drv.
+ *
+ * If an error occurs the @errp pointer is set.
+ */
+BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts,
+ BlockDriverState *in_bs, Error **errp)
+{
+ if (!drv->bdrv_measure) {
+ error_setg(errp, "Block driver '%s' does not support size measurement",
+ drv->format_name);
+ return NULL;
+ }
+
+ return drv->bdrv_measure(opts, in_bs, errp);
+}
+
/**
* Return number of sectors on success, -errno on error.
*/
return bs->encrypted;
}
-bool bdrv_key_required(BlockDriverState *bs)
-{
- BdrvChild *backing = bs->backing;
-
- if (backing && backing->bs->encrypted && !backing->bs->valid_key) {
- return true;
- }
- return (bs->encrypted && !bs->valid_key);
-}
-
-int bdrv_set_key(BlockDriverState *bs, const char *key)
-{
- int ret;
- if (bs->backing && bs->backing->bs->encrypted) {
- ret = bdrv_set_key(bs->backing->bs, key);
- if (ret < 0)
- return ret;
- if (!bs->encrypted)
- return 0;
- }
- if (!bs->encrypted) {
- return -EINVAL;
- } else if (!bs->drv || !bs->drv->bdrv_set_key) {
- return -ENOMEDIUM;
- }
- ret = bs->drv->bdrv_set_key(bs, key);
- if (ret < 0) {
- bs->valid_key = false;
- } else if (!bs->valid_key) {
- /* call the change callback now, we skipped it on open */
- bs->valid_key = true;
- bdrv_parent_cb_change_media(bs, true);
- }
- return ret;
-}
-
-/*
- * Provide an encryption key for @bs.
- * If @key is non-null:
- * If @bs is not encrypted, fail.
- * Else if the key is invalid, fail.
- * Else set @bs's key to @key, replacing the existing key, if any.
- * If @key is null:
- * If @bs is encrypted and still lacks a key, fail.
- * Else do nothing.
- * On failure, store an error object through @errp if non-null.
- */
-void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp)
-{
- if (key) {
- if (!bdrv_is_encrypted(bs)) {
- error_setg(errp, "Node '%s' is not encrypted",
- bdrv_get_device_or_node_name(bs));
- } else if (bdrv_set_key(bs, key) < 0) {
- error_setg(errp, QERR_INVALID_PASSWORD);
- }
- } else {
- if (bdrv_key_required(bs)) {
- error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED,
- "'%s' (%s) is encrypted",
- bdrv_get_device_or_node_name(bs),
- bdrv_get_encrypted_filename(bs));
- }
- }
-}
-
const char *bdrv_get_format_name(BlockDriverState *bs)
{
return bs->drv ? bs->drv->format_name : NULL;
void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp)
{
BdrvChild *child, *parent;
+ uint64_t perm, shared_perm;
Error *local_err = NULL;
int ret;
return;
}
+ /* Update permissions, they may differ for inactive nodes */
+ bdrv_get_cumulative_perm(bs, &perm, &shared_perm);
+ ret = bdrv_check_perm(bs, perm, shared_perm, NULL, &local_err);
+ if (ret < 0) {
+ bs->open_flags |= BDRV_O_INACTIVE;
+ error_propagate(errp, local_err);
+ return;
+ }
+ bdrv_set_perm(bs, perm, shared_perm);
+
QLIST_FOREACH(parent, &bs->parents, next_parent) {
if (parent->role->activate) {
parent->role->activate(parent, &local_err);
static int bdrv_inactivate_recurse(BlockDriverState *bs,
bool setting_flag)
{
- BdrvChild *child;
+ BdrvChild *child, *parent;
int ret;
if (!setting_flag && bs->drv->bdrv_inactivate) {
}
}
+ if (setting_flag) {
+ uint64_t perm, shared_perm;
+
+ bs->open_flags |= BDRV_O_INACTIVE;
+
+ QLIST_FOREACH(parent, &bs->parents, next_parent) {
+ if (parent->role->inactivate) {
+ ret = parent->role->inactivate(parent);
+ if (ret < 0) {
+ bs->open_flags &= ~BDRV_O_INACTIVE;
+ return ret;
+ }
+ }
+ }
+
+ /* Update permissions, they may differ for inactive nodes */
+ bdrv_get_cumulative_perm(bs, &perm, &shared_perm);
+ bdrv_check_perm(bs, perm, shared_perm, NULL, &error_abort);
+ bdrv_set_perm(bs, perm, shared_perm);
+ }
+
QLIST_FOREACH(child, &bs->children, next) {
ret = bdrv_inactivate_recurse(child->bs, setting_flag);
if (ret < 0) {
}
}
- if (setting_flag) {
- bs->open_flags |= BDRV_O_INACTIVE;
- }
+ /* At this point persistent bitmaps should be already stored by the format
+ * driver */
+ bdrv_release_persistent_dirty_bitmaps(bs);
+
return 0;
}
assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX);
if (!QLIST_EMPTY(&bs->op_blockers[op])) {
blocker = QLIST_FIRST(&bs->op_blockers[op]);
- if (errp) {
- *errp = error_copy(blocker->reason);
- error_prepend(errp, "Node '%s' is busy: ",
- bdrv_get_device_or_node_name(bs));
- }
+ error_propagate(errp, error_copy(blocker->reason));
+ error_prepend(errp, "Node '%s' is busy: ",
+ bdrv_get_device_or_node_name(bs));
return true;
}
return false;
parent_bs->drv->bdrv_del_child(parent_bs, child, errp);
}
+
+bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,
+ uint32_t granularity, Error **errp)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv) {
+ error_setg_errno(errp, ENOMEDIUM,
+ "Can't store persistent bitmaps to %s",
+ bdrv_get_device_or_node_name(bs));
+ return false;
+ }
+
+ if (!drv->bdrv_can_store_new_dirty_bitmap) {
+ error_setg_errno(errp, ENOTSUP,
+ "Can't store persistent bitmaps to %s",
+ bdrv_get_device_or_node_name(bs));
+ return false;
+ }
+
+ return drv->bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp);
+}
projects / thirdparty / qemu.git / blobdiff