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authorPeter Maydell <peter.maydell@linaro.org>2015-06-15 10:43:06 +0100
committerPeter Maydell <peter.maydell@linaro.org>2015-06-15 10:43:06 +0100
commitf3e3b083d4c266ea864ae3c83da49d4086857679 (patch)
treebf422fd90fea01dad6ca30d5e29aaa63a314fd4c /block.c
parent8aeaa055f5d3d4e87bf870892ba301eae57bdc1d (diff)
parent67251a311371c4d22e803f151f47fe817175b6c3 (diff)
downloadqemu-arm-f3e3b083d4c266ea864ae3c83da49d4086857679.tar.gz
Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer core and image format patches # gpg: Signature made Fri Jun 12 16:08:53 2015 BST using RSA key ID C88F2FD6 # gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" * remotes/kevin/tags/for-upstream: (25 commits) block: Fix reopen flag inheritance block: Add BlockDriverState.inherits_from block: Add list of children to BlockDriverState queue.h: Add QLIST_FIX_HEAD_PTR() block: Drain requests before swapping nodes in bdrv_swap() block: Move flag inheritance to bdrv_open_inherit() block: Use QemuOpts in bdrv_open_common() block: Use macro for cache option names vmdk: Use bdrv_open_image() quorum: Use bdrv_open_image() check-qdict: Test cases for new functions qdict: Add qdict_{set,copy}_default() qdict: Add qdict_array_entries() iotests: Add tests for overriding BDRV_O_PROTOCOL block: driver should override flags in bdrv_open() block: Change bitmap truncate conditional to assertion block: record new size in bdrv_dirty_bitmap_truncate raw-posix: Fix .bdrv_co_get_block_status() for unaligned image size vmdk: Use vmdk_find_index_in_cluster everywhere vmdk: Fix index_in_cluster calculation in vmdk_co_get_block_status ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'block.c')
-rw-r--r--block.c237
1 files changed, 197 insertions, 40 deletions
diff --git a/block.c b/block.c
index 54d789a8e9..dd4f58d6cb 100644
--- a/block.c
+++ b/block.c
@@ -80,6 +80,12 @@ static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states =
static QLIST_HEAD(, BlockDriver) bdrv_drivers =
QLIST_HEAD_INITIALIZER(bdrv_drivers);
+static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
+ const char *reference, QDict *options, int flags,
+ BlockDriverState *parent,
+ const BdrvChildRole *child_role,
+ BlockDriver *drv, Error **errp);
+
static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs);
/* If non-zero, use only whitelisted block drivers */
static int use_bdrv_whitelist;
@@ -683,8 +689,8 @@ static int bdrv_temp_snapshot_flags(int flags)
}
/*
- * Returns the flags that bs->file should get, based on the given flags for
- * the parent BDS
+ * Returns the flags that bs->file should get if a protocol driver is expected,
+ * based on the given flags for the parent BDS
*/
static int bdrv_inherited_flags(int flags)
{
@@ -701,6 +707,25 @@ static int bdrv_inherited_flags(int flags)
return flags;
}
+const BdrvChildRole child_file = {
+ .inherit_flags = bdrv_inherited_flags,
+};
+
+/*
+ * Returns the flags that bs->file should get if the use of formats (and not
+ * only protocols) is permitted for it, based on the given flags for the parent
+ * BDS
+ */
+static int bdrv_inherited_fmt_flags(int parent_flags)
+{
+ int flags = child_file.inherit_flags(parent_flags);
+ return flags & ~BDRV_O_PROTOCOL;
+}
+
+const BdrvChildRole child_format = {
+ .inherit_flags = bdrv_inherited_fmt_flags,
+};
+
/*
* Returns the flags that bs->backing_hd should get, based on the given flags
* for the parent BDS
@@ -716,6 +741,10 @@ static int bdrv_backing_flags(int flags)
return flags;
}
+static const BdrvChildRole child_backing = {
+ .inherit_flags = bdrv_backing_flags,
+};
+
static int bdrv_open_flags(BlockDriverState *bs, int flags)
{
int open_flags = flags | BDRV_O_CACHE_WB;
@@ -768,6 +797,19 @@ static void bdrv_assign_node_name(BlockDriverState *bs,
QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list);
}
+static QemuOptsList bdrv_runtime_opts = {
+ .name = "bdrv_common",
+ .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head),
+ .desc = {
+ {
+ .name = "node-name",
+ .type = QEMU_OPT_STRING,
+ .help = "Node name of the block device node",
+ },
+ { /* end of list */ }
+ },
+};
+
/*
* Common part for opening disk images and files
*
@@ -779,6 +821,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
int ret, open_flags;
const char *filename;
const char *node_name = NULL;
+ QemuOpts *opts;
Error *local_err = NULL;
assert(drv != NULL);
@@ -799,23 +842,22 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name);
- node_name = qdict_get_try_str(options, "node-name");
- bdrv_assign_node_name(bs, node_name, &local_err);
+ opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort);
+ qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
- return -EINVAL;
+ ret = -EINVAL;
+ goto fail_opts;
}
- qdict_del(options, "node-name");
- /* bdrv_open() with directly using a protocol as drv. This layer is already
- * opened, so assign it to bs (while file becomes a closed BlockDriverState)
- * and return immediately. */
- if (file != NULL && drv->bdrv_file_open) {
- bdrv_swap(file, bs);
- return 0;
+ node_name = qemu_opt_get(opts, "node-name");
+ bdrv_assign_node_name(bs, node_name, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ ret = -EINVAL;
+ goto fail_opts;
}
- bs->open_flags = flags;
bs->guest_block_size = 512;
bs->request_alignment = 512;
bs->zero_beyond_eof = true;
@@ -828,7 +870,8 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
? "Driver '%s' can only be used for read-only devices"
: "Driver '%s' is not whitelisted",
drv->format_name);
- return -ENOTSUP;
+ ret = -ENOTSUP;
+ goto fail_opts;
}
assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
@@ -837,7 +880,8 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
bdrv_enable_copy_on_read(bs);
} else {
error_setg(errp, "Can't use copy-on-read on read-only device");
- return -EINVAL;
+ ret = -EINVAL;
+ goto fail_opts;
}
}
@@ -903,6 +947,8 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
assert(bdrv_opt_mem_align(bs) != 0);
assert(bdrv_min_mem_align(bs) != 0);
assert((bs->request_alignment != 0) || bs->sg);
+
+ qemu_opts_del(opts);
return 0;
free_and_fail:
@@ -910,6 +956,8 @@ free_and_fail:
g_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;
+fail_opts:
+ qemu_opts_del(opts);
return ret;
}
@@ -943,14 +991,17 @@ static QDict *parse_json_filename(const char *filename, Error **errp)
/*
* Fills in default options for opening images and converts the legacy
* filename/flags pair to option QDict entries.
+ * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a
+ * block driver has been specified explicitly.
*/
-static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
- BlockDriver *drv, Error **errp)
+static int bdrv_fill_options(QDict **options, const char **pfilename,
+ int *flags, BlockDriver *drv, Error **errp)
{
const char *filename = *pfilename;
const char *drvname;
- bool protocol = flags & BDRV_O_PROTOCOL;
+ bool protocol = *flags & BDRV_O_PROTOCOL;
bool parse_filename = false;
+ BlockDriver *tmp_drv;
Error *local_err = NULL;
/* Parse json: pseudo-protocol */
@@ -968,6 +1019,24 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
*pfilename = filename = NULL;
}
+ drvname = qdict_get_try_str(*options, "driver");
+
+ /* If the user has explicitly specified the driver, this choice should
+ * override the BDRV_O_PROTOCOL flag */
+ tmp_drv = drv;
+ if (!tmp_drv && drvname) {
+ tmp_drv = bdrv_find_format(drvname);
+ }
+ if (tmp_drv) {
+ protocol = tmp_drv->bdrv_file_open;
+ }
+
+ if (protocol) {
+ *flags |= BDRV_O_PROTOCOL;
+ } else {
+ *flags &= ~BDRV_O_PROTOCOL;
+ }
+
/* Fetch the file name from the options QDict if necessary */
if (protocol && filename) {
if (!qdict_haskey(*options, "filename")) {
@@ -982,7 +1051,6 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
/* Find the right block driver */
filename = qdict_get_try_str(*options, "filename");
- drvname = qdict_get_try_str(*options, "driver");
if (drv) {
if (drvname) {
@@ -1119,9 +1187,10 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp)
}
assert(bs->backing_hd == NULL);
- ret = bdrv_open(&backing_hd,
- *backing_filename ? backing_filename : NULL, NULL, options,
- bdrv_backing_flags(bs->open_flags), NULL, &local_err);
+ ret = bdrv_open_inherit(&backing_hd,
+ *backing_filename ? backing_filename : NULL,
+ NULL, options, 0, bs, &child_backing,
+ NULL, &local_err);
if (ret < 0) {
bdrv_unref(backing_hd);
backing_hd = NULL;
@@ -1155,7 +1224,8 @@ free_exit:
* To conform with the behavior of bdrv_open(), *pbs has to be NULL.
*/
int bdrv_open_image(BlockDriverState **pbs, const char *filename,
- QDict *options, const char *bdref_key, int flags,
+ QDict *options, const char *bdref_key,
+ BlockDriverState* parent, const BdrvChildRole *child_role,
bool allow_none, Error **errp)
{
QDict *image_options;
@@ -1183,7 +1253,8 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
goto done;
}
- ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp);
+ ret = bdrv_open_inherit(pbs, filename, reference, image_options, 0,
+ parent, child_role, NULL, errp);
done:
qdict_del(options, bdref_key);
@@ -1255,6 +1326,19 @@ out:
return ret;
}
+static void bdrv_attach_child(BlockDriverState *parent_bs,
+ BlockDriverState *child_bs,
+ const BdrvChildRole *child_role)
+{
+ BdrvChild *child = g_new(BdrvChild, 1);
+ *child = (BdrvChild) {
+ .bs = child_bs,
+ .role = child_role,
+ };
+
+ QLIST_INSERT_HEAD(&parent_bs->children, child, next);
+}
+
/*
* Opens a disk image (raw, qcow2, vmdk, ...)
*
@@ -1270,9 +1354,11 @@ out:
* should be opened. If specified, neither options nor a filename may be given,
* nor can an existing BDS be reused (that is, *pbs has to be NULL).
*/
-int bdrv_open(BlockDriverState **pbs, const char *filename,
- const char *reference, QDict *options, int flags,
- BlockDriver *drv, Error **errp)
+static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
+ const char *reference, QDict *options, int flags,
+ BlockDriverState *parent,
+ const BdrvChildRole *child_role,
+ BlockDriver *drv, Error **errp)
{
int ret;
BlockDriverState *file = NULL, *bs;
@@ -1281,6 +1367,8 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
int snapshot_flags = 0;
assert(pbs);
+ assert(!child_role || !flags);
+ assert(!child_role == !parent);
if (reference) {
bool options_non_empty = options ? qdict_size(options) : false;
@@ -1303,6 +1391,9 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
return -ENODEV;
}
bdrv_ref(bs);
+ if (child_role) {
+ bdrv_attach_child(parent, bs, child_role);
+ }
*pbs = bs;
return 0;
}
@@ -1318,7 +1409,12 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
options = qdict_new();
}
- ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err);
+ if (child_role) {
+ bs->inherits_from = parent;
+ flags = child_role->inherit_flags(parent->open_flags);
+ }
+
+ ret = bdrv_fill_options(&options, &filename, &flags, drv, &local_err);
if (local_err) {
goto fail;
}
@@ -1337,12 +1433,8 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
}
assert(drvname || !(flags & BDRV_O_PROTOCOL));
- if (drv && !drv->bdrv_file_open) {
- /* If the user explicitly wants a format driver here, we'll need to add
- * another layer for the protocol in bs->file */
- flags &= ~BDRV_O_PROTOCOL;
- }
+ bs->open_flags = flags;
bs->options = options;
options = qdict_clone_shallow(options);
@@ -1357,9 +1449,9 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
}
assert(file == NULL);
+ bs->open_flags = flags;
ret = bdrv_open_image(&file, filename, options, "file",
- bdrv_inherited_flags(flags),
- true, &local_err);
+ bs, &child_file, true, &local_err);
if (ret < 0) {
goto fail;
}
@@ -1378,6 +1470,12 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
goto fail;
}
+ /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */
+ assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open);
+ /* file must be NULL if a protocol BDS is about to be created
+ * (the inverse results in an error message from bdrv_open_common()) */
+ assert(!(flags & BDRV_O_PROTOCOL) || !file);
+
/* Open the image */
ret = bdrv_open_common(bs, file, options, flags, drv, &local_err);
if (ret < 0) {
@@ -1440,6 +1538,10 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
goto close_and_fail;
}
+ if (child_role) {
+ bdrv_attach_child(parent, bs, child_role);
+ }
+
QDECREF(options);
*pbs = bs;
return 0;
@@ -1476,6 +1578,14 @@ close_and_fail:
return ret;
}
+int bdrv_open(BlockDriverState **pbs, const char *filename,
+ const char *reference, QDict *options, int flags,
+ BlockDriver *drv, Error **errp)
+{
+ return bdrv_open_inherit(pbs, filename, reference, options, flags, NULL,
+ NULL, drv, errp);
+}
+
typedef struct BlockReopenQueueEntry {
bool prepared;
BDRVReopenState state;
@@ -1506,6 +1616,8 @@ BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
assert(bs != NULL);
BlockReopenQueueEntry *bs_entry;
+ BdrvChild *child;
+
if (bs_queue == NULL) {
bs_queue = g_new0(BlockReopenQueue, 1);
QSIMPLEQ_INIT(bs_queue);
@@ -1514,8 +1626,15 @@ BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
/* bdrv_open() masks this flag out */
flags &= ~BDRV_O_PROTOCOL;
- if (bs->file) {
- bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags));
+ QLIST_FOREACH(child, &bs->children, next) {
+ int child_flags;
+
+ if (child->bs->inherits_from != bs) {
+ continue;
+ }
+
+ child_flags = child->role->inherit_flags(flags);
+ bdrv_reopen_queue(bs_queue, child->bs, child_flags);
}
bs_entry = g_new0(BlockReopenQueueEntry, 1);
@@ -1726,6 +1845,16 @@ void bdrv_close(BlockDriverState *bs)
notifier_list_notify(&bs->close_notifiers, bs);
if (bs->drv) {
+ BdrvChild *child, *next;
+
+ QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
+ if (child->bs->inherits_from == bs) {
+ child->bs->inherits_from = NULL;
+ }
+ QLIST_REMOVE(child, next);
+ g_free(child);
+ }
+
if (bs->backing_hd) {
BlockDriverState *backing_hd = bs->backing_hd;
bdrv_set_backing_hd(bs, NULL);
@@ -1876,6 +2005,10 @@ static void bdrv_move_feature_fields(BlockDriverState *bs_dest,
void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old)
{
BlockDriverState tmp;
+ BdrvChild *child;
+
+ bdrv_drain(bs_new);
+ bdrv_drain(bs_old);
/* The code needs to swap the node_name but simply swapping node_list won't
* work so first remove the nodes from the graph list, do the swap then
@@ -1935,6 +2068,30 @@ void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old)
QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list);
}
+ /*
+ * Update lh_first.le_prev for non-empty lists.
+ *
+ * The head of the op blocker list doesn't change because it is moved back
+ * in bdrv_move_feature_fields().
+ */
+ assert(QLIST_EMPTY(&bs_old->tracked_requests));
+ assert(QLIST_EMPTY(&bs_new->tracked_requests));
+
+ QLIST_FIX_HEAD_PTR(&bs_new->children, next);
+ QLIST_FIX_HEAD_PTR(&bs_old->children, next);
+
+ /* Update references in bs->opaque and children */
+ QLIST_FOREACH(child, &bs_old->children, next) {
+ if (child->bs->inherits_from == bs_new) {
+ child->bs->inherits_from = bs_old;
+ }
+ }
+ QLIST_FOREACH(child, &bs_new->children, next) {
+ if (child->bs->inherits_from == bs_old) {
+ child->bs->inherits_from = bs_new;
+ }
+ }
+
bdrv_rebind(bs_new);
bdrv_rebind(bs_old);
}
@@ -1957,6 +2114,7 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top)
/* The contents of 'tmp' will become bs_top, as we are
* swapping bs_new and bs_top contents. */
bdrv_set_backing_hd(bs_top, bs_new);
+ bdrv_attach_child(bs_top, bs_new, &child_backing);
}
static void bdrv_delete(BlockDriverState *bs)
@@ -3242,10 +3400,9 @@ static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)
uint64_t size = bdrv_nb_sectors(bs);
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
- if (bdrv_dirty_bitmap_frozen(bitmap)) {
- continue;
- }
+ assert(!bdrv_dirty_bitmap_frozen(bitmap));
hbitmap_truncate(bitmap->bitmap, size);
+ bitmap->size = size;
}
}