#include "qemu/timer.h"
#include "qemu/hbitmap.h"
#include "block/snapshot.h"
-#include "qemu/main-loop.h"
#include "qemu/throttle.h"
#define BLOCK_FLAG_LAZY_REFCOUNTS 8
#define BLOCK_OPT_NOCOW "nocow"
#define BLOCK_OPT_OBJECT_SIZE "object_size"
#define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
+#define BLOCK_OPT_DATA_FILE "data_file"
+#define BLOCK_OPT_DATA_FILE_RAW "data_file_raw"
#define BLOCK_PROBE_BUF_SIZE 512
/* List of options for creating images, terminated by name == NULL */
QemuOptsList *create_opts;
+ /*
+ * If this driver supports reopening images this contains a
+ * NULL-terminated list of the runtime options that can be
+ * modified. If an option in this list is unspecified during
+ * reopen then it _must_ be reset to its default value or return
+ * an error.
+ */
+ const char *const *mutable_opts;
/*
* Returns 0 for completed check, -errno for internal errors.
* These functions must not change the graph (and therefore also must not
* call aio_poll(), which could change the graph indirectly).
*
+ * If drained_end() schedules background operations, it must atomically
+ * increment *drained_end_counter for each such operation and atomically
+ * decrement it once the operation has settled.
+ *
* Note that this can be nested. If drained_begin() was called twice, new
* I/O is allowed only after drained_end() was called twice, too.
*/
void (*drained_begin)(BdrvChild *child);
- void (*drained_end)(BdrvChild *child);
+ void (*drained_end)(BdrvChild *child, int *drained_end_counter);
/*
* Returns whether the parent has pending requests for the child. This
* can update its reference. */
int (*update_filename)(BdrvChild *child, BlockDriverState *new_base,
const char *filename, Error **errp);
+
+ bool (*can_set_aio_ctx)(BdrvChild *child, AioContext *ctx,
+ GSList **ignore, Error **errp);
+ void (*set_aio_ctx)(BdrvChild *child, AioContext *ctx, GSList **ignore);
};
extern const BdrvChildRole child_file;
uint64_t backup_perm;
uint64_t backup_shared_perm;
+ /*
+ * This link is frozen: the child can neither be replaced nor
+ * detached from the parent.
+ */
+ bool frozen;
+
+ /*
+ * How many times the parent of this child has been drained
+ * (through role->drained_*).
+ * Usually, this is equal to bs->quiesce_counter (potentially
+ * reduced by bdrv_drain_all_count). It may differ while the
+ * child is entering or leaving a drained section.
+ */
+ int parent_quiesce_counter;
+
QLIST_ENTRY(BdrvChild) next;
QLIST_ENTRY(BdrvChild) next_parent;
};
/* operation blockers */
QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX];
- /* long-running background operation */
- BlockJob *job;
-
/* The node that this node inherited default options from (and a reopen on
* which can affect this node by changing these defaults). This is always a
* parent node of this node. */
/* Only read/written by whoever has set active_flush_req to true. */
unsigned int flushed_gen; /* Flushed write generation */
+
+ /* BdrvChild links to this node may never be frozen */
+ bool never_freeze;
};
struct BlockBackendRootState {
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags);
+static inline int coroutine_fn bdrv_co_pread(BdrvChild *child,
+ int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags)
+{
+ QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
+
+ return bdrv_co_preadv(child, offset, bytes, &qiov, flags);
+}
+
+static inline int coroutine_fn bdrv_co_pwrite(BdrvChild *child,
+ int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags)
+{
+ QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
+
+ return bdrv_co_pwritev(child, offset, bytes, &qiov, flags);
+}
+
extern unsigned int bdrv_drain_all_count;
void bdrv_apply_subtree_drain(BdrvChild *child, BlockDriverState *new_parent);
void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent);
void bdrv_add_before_write_notifier(BlockDriverState *bs,
NotifierWithReturn *notifier);
-/**
- * bdrv_detach_aio_context:
- *
- * May be called from .bdrv_detach_aio_context() to detach children from the
- * current #AioContext. This is only needed by block drivers that manage their
- * own children. Both ->file and ->backing are automatically handled and
- * block drivers should not call this function on them explicitly.
- */
-void bdrv_detach_aio_context(BlockDriverState *bs);
-
-/**
- * bdrv_attach_aio_context:
- *
- * May be called from .bdrv_attach_aio_context() to attach children to the new
- * #AioContext. This is only needed by block drivers that manage their own
- * children. Both ->file and ->backing are automatically handled and block
- * drivers should not call this function on them explicitly.
- */
-void bdrv_attach_aio_context(BlockDriverState *bs,
- AioContext *new_context);
-
/**
* bdrv_add_aio_context_notifier:
*
* @errp: Error object.
*
*/
-void commit_active_start(const char *job_id, BlockDriverState *bs,
- BlockDriverState *base, int creation_flags,
- int64_t speed, BlockdevOnError on_error,
- const char *filter_node_name,
- BlockCompletionFunc *cb, void *opaque,
- bool auto_complete, Error **errp);
+BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs,
+ BlockDriverState *base, int creation_flags,
+ int64_t speed, BlockdevOnError on_error,
+ const char *filter_node_name,
+ BlockCompletionFunc *cb, void *opaque,
+ bool auto_complete, Error **errp);
/*
* mirror_start:
* @job_id: The id of the newly-created job, or %NULL to use the
BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
const char *child_name,
const BdrvChildRole *child_role,
+ AioContext *ctx,
uint64_t perm, uint64_t shared_perm,
void *opaque, Error **errp);
void bdrv_root_unref_child(BdrvChild *child);
+/**
+ * Sets a BdrvChild's permissions. Avoid if the parent is a BDS; use
+ * bdrv_child_refresh_perms() instead and make the parent's
+ * .bdrv_child_perm() implementation return the correct values.
+ */
int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
Error **errp);
+/**
+ * Calls bs->drv->bdrv_child_perm() and updates the child's permission
+ * masks with the result.
+ * Drivers should invoke this function whenever an event occurs that
+ * makes their .bdrv_child_perm() implementation return different
+ * values than before, but which will not result in the block layer
+ * automatically refreshing the permissions.
+ */
+int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp);
+
/* Default implementation for BlockDriver.bdrv_child_perm() that can be used by
* block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to
* all children */
projects / qemu.git / blobdiff