diff options
Diffstat (limited to 'qemu/block.c')
| -rw-r--r-- | qemu/block.c | 1944 |
1 files changed, 837 insertions, 1107 deletions
diff --git a/qemu/block.c b/qemu/block.c index d088ee02f..d4939b49b 100644 --- a/qemu/block.c +++ b/qemu/block.c @@ -21,28 +21,28 @@ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ -#include "config-host.h" -#include "qemu-common.h" +#include "qemu/osdep.h" #include "trace.h" #include "block/block_int.h" #include "block/blockjob.h" #include "qemu/error-report.h" #include "qemu/module.h" #include "qapi/qmp/qerror.h" +#include "qapi/qmp/qbool.h" #include "qapi/qmp/qjson.h" #include "sysemu/block-backend.h" #include "sysemu/sysemu.h" #include "qemu/notify.h" -#include "block/coroutine.h" +#include "qemu/coroutine.h" #include "block/qapi.h" #include "qmp-commands.h" #include "qemu/timer.h" #include "qapi-event.h" #include "block/throttle-groups.h" +#include "qemu/cutils.h" +#include "qemu/id.h" #ifdef CONFIG_BSD -#include <sys/types.h> -#include <sys/stat.h> #include <sys/ioctl.h> #include <sys/queue.h> #ifndef __DragonFly__ @@ -54,44 +54,27 @@ #include <windows.h> #endif -/** - * A BdrvDirtyBitmap can be in three possible states: - * (1) successor is NULL and disabled is false: full r/w mode - * (2) successor is NULL and disabled is true: read only mode ("disabled") - * (3) successor is set: frozen mode. - * A frozen bitmap cannot be renamed, deleted, anonymized, cleared, set, - * or enabled. A frozen bitmap can only abdicate() or reclaim(). - */ -struct BdrvDirtyBitmap { - HBitmap *bitmap; /* Dirty sector bitmap implementation */ - BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ - char *name; /* Optional non-empty unique ID */ - int64_t size; /* Size of the bitmap (Number of sectors) */ - bool disabled; /* Bitmap is read-only */ - QLIST_ENTRY(BdrvDirtyBitmap) list; -}; - #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ -static QTAILQ_HEAD(, BlockDriverState) bdrv_states = - QTAILQ_HEAD_INITIALIZER(bdrv_states); - static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); +static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = + QTAILQ_HEAD_INITIALIZER(all_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); + const BdrvChildRole *child_role, Error **errp); -static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs); /* If non-zero, use only whitelisted block drivers */ static int use_bdrv_whitelist; +static void bdrv_close(BlockDriverState *bs); + #ifdef _WIN32 static int is_windows_drive_prefix(const char *filename) { @@ -242,10 +225,7 @@ void bdrv_register(BlockDriver *bdrv) BlockDriverState *bdrv_new_root(void) { - BlockDriverState *bs = bdrv_new(); - - QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); - return bs; + return bdrv_new(); } BlockDriverState *bdrv_new(void) @@ -258,20 +238,15 @@ BlockDriverState *bdrv_new(void) for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { QLIST_INIT(&bs->op_blockers[i]); } - bdrv_iostatus_disable(bs); - notifier_list_init(&bs->close_notifiers); notifier_with_return_list_init(&bs->before_write_notifiers); qemu_co_queue_init(&bs->throttled_reqs[0]); qemu_co_queue_init(&bs->throttled_reqs[1]); bs->refcnt = 1; bs->aio_context = qemu_get_aio_context(); - return bs; -} + QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); -void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) -{ - notifier_list_add(&bs->close_notifiers, notify); + return bs; } BlockDriver *bdrv_find_format(const char *format_name) @@ -314,11 +289,9 @@ static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) return 0; } -BlockDriver *bdrv_find_whitelisted_format(const char *format_name, - bool read_only) +bool bdrv_uses_whitelist(void) { - BlockDriver *drv = bdrv_find_format(format_name); - return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; + return use_bdrv_whitelist; } typedef struct CreateCo { @@ -634,6 +607,20 @@ static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) } /** + * Combines a QDict of new block driver @options with any missing options taken + * from @old_options, so that leaving out an option defaults to its old value. + */ +static void bdrv_join_options(BlockDriverState *bs, QDict *options, + QDict *old_options) +{ + if (bs->drv && bs->drv->bdrv_join_options) { + bs->drv->bdrv_join_options(options, old_options); + } else { + qdict_join(options, old_options, false); + } +} + +/** * Set open flags for a given discard mode * * Return 0 on success, -1 if the discard mode was invalid. @@ -658,21 +645,23 @@ int bdrv_parse_discard_flags(const char *mode, int *flags) * * Return 0 on success, -1 if the cache mode was invalid. */ -int bdrv_parse_cache_flags(const char *mode, int *flags) +int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) { *flags &= ~BDRV_O_CACHE_MASK; if (!strcmp(mode, "off") || !strcmp(mode, "none")) { - *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; + *writethrough = false; + *flags |= BDRV_O_NOCACHE; } else if (!strcmp(mode, "directsync")) { + *writethrough = true; *flags |= BDRV_O_NOCACHE; } else if (!strcmp(mode, "writeback")) { - *flags |= BDRV_O_CACHE_WB; + *writethrough = false; } else if (!strcmp(mode, "unsafe")) { - *flags |= BDRV_O_CACHE_WB; + *writethrough = false; *flags |= BDRV_O_NO_FLUSH; } else if (!strcmp(mode, "writethrough")) { - /* this is the default */ + *writethrough = true; } else { return -1; } @@ -681,75 +670,101 @@ int bdrv_parse_cache_flags(const char *mode, int *flags) } /* - * Returns the flags that a temporary snapshot should get, based on the - * originally requested flags (the originally requested image will have flags - * like a backing file) + * Returns the options and flags that a temporary snapshot should get, based on + * the originally requested flags (the originally requested image will have + * flags like a backing file) */ -static int bdrv_temp_snapshot_flags(int flags) +static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, + int parent_flags, QDict *parent_options) { - return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; + *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; + + /* For temporary files, unconditional cache=unsafe is fine */ + qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); + qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); } /* - * Returns the flags that bs->file should get if a protocol driver is expected, - * based on the given flags for the parent BDS + * Returns the options and flags that bs->file should get if a protocol driver + * is expected, based on the given options and flags for the parent BDS */ -static int bdrv_inherited_flags(int flags) +static void bdrv_inherited_options(int *child_flags, QDict *child_options, + int parent_flags, QDict *parent_options) { + int flags = parent_flags; + /* Enable protocol handling, disable format probing for bs->file */ flags |= BDRV_O_PROTOCOL; + /* If the cache mode isn't explicitly set, inherit direct and no-flush from + * the parent. */ + qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); + qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); + /* Our block drivers take care to send flushes and respect unmap policy, - * so we can enable both unconditionally on lower layers. */ - flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; + * so we can default to enable both on lower layers regardless of the + * corresponding parent options. */ + flags |= BDRV_O_UNMAP; /* Clear flags that only apply to the top layer */ - flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); + flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ | + BDRV_O_NO_IO); - return flags; + *child_flags = flags; } const BdrvChildRole child_file = { - .inherit_flags = bdrv_inherited_flags, + .inherit_options = bdrv_inherited_options, }; /* - * 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 + * Returns the options and flags that bs->file should get if the use of formats + * (and not only protocols) is permitted for it, based on the given options and + * flags for the parent BDS */ -static int bdrv_inherited_fmt_flags(int parent_flags) +static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options, + int parent_flags, QDict *parent_options) { - int flags = child_file.inherit_flags(parent_flags); - return flags & ~BDRV_O_PROTOCOL; + child_file.inherit_options(child_flags, child_options, + parent_flags, parent_options); + + *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO); } const BdrvChildRole child_format = { - .inherit_flags = bdrv_inherited_fmt_flags, + .inherit_options = bdrv_inherited_fmt_options, }; /* - * Returns the flags that bs->backing_hd should get, based on the given flags - * for the parent BDS + * Returns the options and flags that bs->backing should get, based on the + * given options and flags for the parent BDS */ -static int bdrv_backing_flags(int flags) +static void bdrv_backing_options(int *child_flags, QDict *child_options, + int parent_flags, QDict *parent_options) { + int flags = parent_flags; + + /* The cache mode is inherited unmodified for backing files; except WCE, + * which is only applied on the top level (BlockBackend) */ + qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); + qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); + /* backing files always opened read-only */ flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); /* snapshot=on is handled on the top layer */ flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); - return flags; + *child_flags = flags; } static const BdrvChildRole child_backing = { - .inherit_flags = bdrv_backing_flags, + .inherit_options = bdrv_backing_options, }; static int bdrv_open_flags(BlockDriverState *bs, int flags) { - int open_flags = flags | BDRV_O_CACHE_WB; + int open_flags = flags; /* * Clear flags that are internal to the block layer before opening the @@ -767,16 +782,46 @@ static int bdrv_open_flags(BlockDriverState *bs, int flags) return open_flags; } +static void update_flags_from_options(int *flags, QemuOpts *opts) +{ + *flags &= ~BDRV_O_CACHE_MASK; + + assert(qemu_opt_find(opts, BDRV_OPT_CACHE_NO_FLUSH)); + if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { + *flags |= BDRV_O_NO_FLUSH; + } + + assert(qemu_opt_find(opts, BDRV_OPT_CACHE_DIRECT)); + if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { + *flags |= BDRV_O_NOCACHE; + } +} + +static void update_options_from_flags(QDict *options, int flags) +{ + if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { + qdict_put(options, BDRV_OPT_CACHE_DIRECT, + qbool_from_bool(flags & BDRV_O_NOCACHE)); + } + if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { + qdict_put(options, BDRV_OPT_CACHE_NO_FLUSH, + qbool_from_bool(flags & BDRV_O_NO_FLUSH)); + } +} + static void bdrv_assign_node_name(BlockDriverState *bs, const char *node_name, Error **errp) { - if (!node_name) { - return; - } + char *gen_node_name = NULL; - /* Check for empty string or invalid characters */ - if (!id_wellformed(node_name)) { + if (!node_name) { + node_name = gen_node_name = id_generate(ID_BLOCK); + } else if (!id_wellformed(node_name)) { + /* + * Check for empty string or invalid characters, but not if it is + * generated (generated names use characters not available to the user) + */ error_setg(errp, "Invalid node name"); return; } @@ -785,18 +830,20 @@ static void bdrv_assign_node_name(BlockDriverState *bs, if (blk_by_name(node_name)) { error_setg(errp, "node-name=%s is conflicting with a device id", node_name); - return; + goto out; } /* takes care of avoiding duplicates node names */ if (bdrv_find_node(node_name)) { error_setg(errp, "Duplicate node name"); - return; + goto out; } /* copy node name into the bs and insert it into the graph list */ pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); +out: + g_free(gen_node_name); } static QemuOptsList bdrv_runtime_opts = { @@ -808,6 +855,21 @@ static QemuOptsList bdrv_runtime_opts = { .type = QEMU_OPT_STRING, .help = "Node name of the block device node", }, + { + .name = "driver", + .type = QEMU_OPT_STRING, + .help = "Block driver to use for the node", + }, + { + .name = BDRV_OPT_CACHE_DIRECT, + .type = QEMU_OPT_BOOL, + .help = "Bypass software writeback cache on the host", + }, + { + .name = BDRV_OPT_CACHE_NO_FLUSH, + .type = QEMU_OPT_BOOL, + .help = "Ignore flush requests", + }, { /* end of list */ } }, }; @@ -817,21 +879,34 @@ static QemuOptsList bdrv_runtime_opts = { * * Removes all processed options from *options. */ -static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, - QDict *options, int flags, BlockDriver *drv, Error **errp) +static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file, + QDict *options, Error **errp) { int ret, open_flags; const char *filename; + const char *driver_name = NULL; const char *node_name = NULL; QemuOpts *opts; + BlockDriver *drv; Error *local_err = NULL; - assert(drv != NULL); assert(bs->file == NULL); assert(options != NULL && bs->options != options); + 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); + ret = -EINVAL; + goto fail_opts; + } + + driver_name = qemu_opt_get(opts, "driver"); + drv = bdrv_find_format(driver_name); + assert(drv != NULL); + if (file != NULL) { - filename = file->filename; + filename = file->bs->filename; } else { filename = qdict_get_try_str(options, "filename"); } @@ -839,19 +914,13 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, if (drv->bdrv_needs_filename && !filename) { error_setg(errp, "The '%s' block driver requires a file name", drv->format_name); - return -EINVAL; - } - - trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); - - 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); ret = -EINVAL; goto fail_opts; } + trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, + drv->format_name); + node_name = qemu_opt_get(opts, "node-name"); bdrv_assign_node_name(bs, node_name, &local_err); if (local_err) { @@ -860,11 +929,9 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, goto fail_opts; } - bs->guest_block_size = 512; bs->request_alignment = 512; bs->zero_beyond_eof = true; - open_flags = bdrv_open_flags(bs, flags); - bs->read_only = !(open_flags & BDRV_O_RDWR); + bs->read_only = !(bs->open_flags & BDRV_O_RDWR); if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { error_setg(errp, @@ -877,7 +944,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, } assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ - if (flags & BDRV_O_COPY_ON_READ) { + if (bs->open_flags & BDRV_O_COPY_ON_READ) { if (!bs->read_only) { bdrv_enable_copy_on_read(bs); } else { @@ -897,9 +964,11 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, bs->drv = drv; bs->opaque = g_malloc0(drv->instance_size); - bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); + /* Apply cache mode options */ + update_flags_from_options(&bs->open_flags, opts); /* Open the image, either directly or using a protocol */ + open_flags = bdrv_open_flags(bs, bs->open_flags); if (drv->bdrv_file_open) { assert(file == NULL); assert(!drv->bdrv_needs_filename || filename != NULL); @@ -926,13 +995,6 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, goto free_and_fail; } - if (bs->encrypted) { - error_report("Encrypted images are deprecated"); - error_printf("Support for them will be removed in a future release.\n" - "You can use 'qemu-img convert' to convert your image" - " to an unencrypted one.\n"); - } - ret = refresh_total_sectors(bs, bs->total_sectors); if (ret < 0) { error_setg_errno(errp, -ret, "Could not refresh total sector count"); @@ -990,47 +1052,55 @@ static QDict *parse_json_filename(const char *filename, Error **errp) return options; } +static void parse_json_protocol(QDict *options, const char **pfilename, + Error **errp) +{ + QDict *json_options; + Error *local_err = NULL; + + /* Parse json: pseudo-protocol */ + if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { + return; + } + + json_options = parse_json_filename(*pfilename, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* Options given in the filename have lower priority than options + * specified directly */ + qdict_join(options, json_options, false); + QDECREF(json_options); + *pfilename = NULL; +} + /* * 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 *filename, + int *flags, Error **errp) { - const char *filename = *pfilename; const char *drvname; bool protocol = *flags & BDRV_O_PROTOCOL; bool parse_filename = false; - BlockDriver *tmp_drv; + BlockDriver *drv = NULL; Error *local_err = NULL; - /* Parse json: pseudo-protocol */ - if (filename && g_str_has_prefix(filename, "json:")) { - QDict *json_options = parse_json_filename(filename, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return -EINVAL; - } - - /* Options given in the filename have lower priority than options - * specified directly */ - qdict_join(*options, json_options, false); - QDECREF(json_options); - *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 (drvname) { + drv = bdrv_find_format(drvname); + if (!drv) { + error_setg(errp, "Unknown driver '%s'", drvname); + return -ENOENT; + } + /* If the user has explicitly specified the driver, this choice should + * override the BDRV_O_PROTOCOL flag */ + protocol = drv->bdrv_file_open; } if (protocol) { @@ -1039,6 +1109,9 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, *flags &= ~BDRV_O_PROTOCOL; } + /* Translate cache options from flags into options */ + update_options_from_flags(*options, *flags); + /* Fetch the file name from the options QDict if necessary */ if (protocol && filename) { if (!qdict_haskey(*options, "filename")) { @@ -1054,33 +1127,18 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, /* Find the right block driver */ filename = qdict_get_try_str(*options, "filename"); - if (drv) { - if (drvname) { - error_setg(errp, "Driver specified twice"); - return -EINVAL; - } - drvname = drv->format_name; - qdict_put(*options, "driver", qstring_from_str(drvname)); - } else { - if (!drvname && protocol) { - if (filename) { - drv = bdrv_find_protocol(filename, parse_filename, errp); - if (!drv) { - return -EINVAL; - } - - drvname = drv->format_name; - qdict_put(*options, "driver", qstring_from_str(drvname)); - } else { - error_setg(errp, "Must specify either driver or file"); - return -EINVAL; - } - } else if (drvname) { - drv = bdrv_find_format(drvname); + if (!drvname && protocol) { + if (filename) { + drv = bdrv_find_protocol(filename, parse_filename, errp); if (!drv) { - error_setg(errp, "Unknown driver '%s'", drvname); - return -ENOENT; + return -EINVAL; } + + drvname = drv->format_name; + qdict_put(*options, "driver", qstring_from_str(drvname)); + } else { + error_setg(errp, "Must specify either driver or file"); + return -EINVAL; } } @@ -1102,68 +1160,100 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, return 0; } -static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, - BlockDriverState *child_bs, - const BdrvChildRole *child_role) +BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, + const char *child_name, + const BdrvChildRole *child_role) { BdrvChild *child = g_new(BdrvChild, 1); *child = (BdrvChild) { .bs = child_bs, + .name = g_strdup(child_name), .role = child_role, }; - QLIST_INSERT_HEAD(&parent_bs->children, child, next); + QLIST_INSERT_HEAD(&child_bs->parents, child, next_parent); + + return child; +} +static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, + BlockDriverState *child_bs, + const char *child_name, + const BdrvChildRole *child_role) +{ + BdrvChild *child = bdrv_root_attach_child(child_bs, child_name, child_role); + QLIST_INSERT_HEAD(&parent_bs->children, child, next); return child; } static void bdrv_detach_child(BdrvChild *child) { - QLIST_REMOVE(child, next); + if (child->next.le_prev) { + QLIST_REMOVE(child, next); + child->next.le_prev = NULL; + } + QLIST_REMOVE(child, next_parent); + g_free(child->name); g_free(child); } +void bdrv_root_unref_child(BdrvChild *child) +{ + BlockDriverState *child_bs; + + child_bs = child->bs; + bdrv_detach_child(child); + bdrv_unref(child_bs); +} + void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) { - BlockDriverState *child_bs = child->bs; + if (child == NULL) { + return; + } if (child->bs->inherits_from == parent) { child->bs->inherits_from = NULL; } - bdrv_detach_child(child); - bdrv_unref(child_bs); + bdrv_root_unref_child(child); } +/* + * Sets the backing file link of a BDS. A new reference is created; callers + * which don't need their own reference any more must call bdrv_unref(). + */ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) { + if (backing_hd) { + bdrv_ref(backing_hd); + } - if (bs->backing_hd) { + if (bs->backing) { assert(bs->backing_blocker); - bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); - bdrv_detach_child(bs->backing_child); + bdrv_op_unblock_all(bs->backing->bs, bs->backing_blocker); + bdrv_unref_child(bs, bs->backing); } else if (backing_hd) { error_setg(&bs->backing_blocker, "node is used as backing hd of '%s'", bdrv_get_device_or_node_name(bs)); } - bs->backing_hd = backing_hd; if (!backing_hd) { error_free(bs->backing_blocker); bs->backing_blocker = NULL; - bs->backing_child = NULL; + bs->backing = NULL; goto out; } - bs->backing_child = bdrv_attach_child(bs, backing_hd, &child_backing); + bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_backing); bs->open_flags &= ~BDRV_O_NO_BACKING; pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_hd->drv ? backing_hd->drv->format_name : ""); - bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); + bdrv_op_block_all(backing_hd, bs->backing_blocker); /* Otherwise we won't be able to commit due to check in bdrv_commit */ - bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, + bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, bs->backing_blocker); out: bdrv_refresh_limits(bs, NULL); @@ -1172,30 +1262,43 @@ out: /* * Opens the backing file for a BlockDriverState if not yet open * - * options is a QDict of options to pass to the block drivers, or NULL for an - * empty set of options. The reference to the QDict is transferred to this - * function (even on failure), so if the caller intends to reuse the dictionary, - * it needs to use QINCREF() before calling bdrv_file_open. + * bdref_key specifies the key for the image's BlockdevRef in the options QDict. + * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict + * itself, all options starting with "${bdref_key}." are considered part of the + * BlockdevRef. + * + * TODO Can this be unified with bdrv_open_image()? */ -int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) +int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, + const char *bdref_key, Error **errp) { char *backing_filename = g_malloc0(PATH_MAX); + char *bdref_key_dot; + const char *reference = NULL; int ret = 0; BlockDriverState *backing_hd; + QDict *options; + QDict *tmp_parent_options = NULL; Error *local_err = NULL; - if (bs->backing_hd != NULL) { - QDECREF(options); + if (bs->backing != NULL) { goto free_exit; } /* NULL means an empty set of options */ - if (options == NULL) { - options = qdict_new(); + if (parent_options == NULL) { + tmp_parent_options = qdict_new(); + parent_options = tmp_parent_options; } bs->open_flags &= ~BDRV_O_NO_BACKING; - if (qdict_haskey(options, "file.filename")) { + + bdref_key_dot = g_strdup_printf("%s.", bdref_key); + qdict_extract_subqdict(parent_options, &options, bdref_key_dot); + g_free(bdref_key_dot); + + reference = qdict_get_try_str(parent_options, bdref_key); + if (reference || qdict_haskey(options, "file.filename")) { backing_filename[0] = '\0'; } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { QDECREF(options); @@ -1218,31 +1321,31 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) goto free_exit; } - backing_hd = bdrv_new(); - if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { qdict_put(options, "driver", qstring_from_str(bs->backing_format)); } - assert(bs->backing_hd == NULL); + backing_hd = NULL; ret = bdrv_open_inherit(&backing_hd, *backing_filename ? backing_filename : NULL, - NULL, options, 0, bs, &child_backing, - NULL, &local_err); + reference, options, 0, bs, &child_backing, + errp); if (ret < 0) { - bdrv_unref(backing_hd); - backing_hd = NULL; bs->open_flags |= BDRV_O_NO_BACKING; - error_setg(errp, "Could not open backing file: %s", - error_get_pretty(local_err)); - error_free(local_err); + error_prepend(errp, "Could not open backing file: "); goto free_exit; } + /* Hook up the backing file link; drop our reference, bs owns the + * backing_hd reference now */ bdrv_set_backing_hd(bs, backing_hd); + bdrv_unref(backing_hd); + + qdict_del(parent_options, bdref_key); free_exit: g_free(backing_filename); + QDECREF(tmp_parent_options); return ret; } @@ -1291,59 +1394,25 @@ BdrvChild *bdrv_open_child(const char *filename, bs = NULL; ret = bdrv_open_inherit(&bs, filename, reference, image_options, 0, - parent, child_role, NULL, errp); + parent, child_role, errp); if (ret < 0) { goto done; } - c = bdrv_attach_child(parent, bs, child_role); + c = bdrv_attach_child(parent, bs, bdref_key, child_role); done: qdict_del(options, bdref_key); return c; } -/* - * This is a version of bdrv_open_child() that returns 0/-EINVAL instead of - * a BdrvChild object. - * - * If allow_none is true, no image will be opened if filename is false and no - * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. - * - * 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, - BlockDriverState* parent, const BdrvChildRole *child_role, - bool allow_none, Error **errp) -{ - Error *local_err = NULL; - BdrvChild *c; - - assert(pbs); - assert(*pbs == NULL); - - c = bdrv_open_child(filename, options, bdref_key, parent, child_role, - allow_none, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return -EINVAL; - } - - if (c != NULL) { - *pbs = c->bs; - } - - return 0; -} - -int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) +static int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, + QDict *snapshot_options, Error **errp) { /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ char *tmp_filename = g_malloc0(PATH_MAX + 1); int64_t total_size; QemuOpts *opts = NULL; - QDict *snapshot_options; BlockDriverState *bs_snapshot; Error *local_err = NULL; int ret; @@ -1369,27 +1438,27 @@ int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, &error_abort); qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); - ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, &local_err); + ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); qemu_opts_del(opts); if (ret < 0) { - error_setg_errno(errp, -ret, "Could not create temporary overlay " - "'%s': %s", tmp_filename, - error_get_pretty(local_err)); - error_free(local_err); + error_prepend(errp, "Could not create temporary overlay '%s': ", + tmp_filename); goto out; } - /* Prepare a new options QDict for the temporary file */ - snapshot_options = qdict_new(); + /* Prepare options QDict for the temporary file */ qdict_put(snapshot_options, "file.driver", qstring_from_str("file")); qdict_put(snapshot_options, "file.filename", qstring_from_str(tmp_filename)); + qdict_put(snapshot_options, "driver", + qstring_from_str("qcow2")); bs_snapshot = bdrv_new(); ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, - flags, &bdrv_qcow2, &local_err); + flags, &local_err); + snapshot_options = NULL; if (ret < 0) { error_propagate(errp, local_err); goto out; @@ -1398,6 +1467,7 @@ int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) bdrv_append(bs_snapshot, bs); out: + QDECREF(snapshot_options); g_free(tmp_filename); return ret; } @@ -1420,13 +1490,16 @@ out: 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) + const BdrvChildRole *child_role, Error **errp) { int ret; - BlockDriverState *file = NULL, *bs; + BdrvChild *file = NULL; + BlockDriverState *bs; + BlockDriver *drv = NULL; const char *drvname; + const char *backing; Error *local_err = NULL; + QDict *snapshot_options = NULL; int snapshot_flags = 0; assert(pbs); @@ -1453,6 +1526,13 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, if (!bs) { return -ENODEV; } + + if (bs->throttle_state) { + error_setg(errp, "Cannot reference an existing block device for " + "which I/O throttling is enabled"); + return -EINVAL; + } + bdrv_ref(bs); *pbs = bs; return 0; @@ -1469,22 +1549,34 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, options = qdict_new(); } + /* json: syntax counts as explicit options, as if in the QDict */ + parse_json_protocol(options, &filename, &local_err); + if (local_err) { + ret = -EINVAL; + goto fail; + } + + bs->explicit_options = qdict_clone_shallow(options); + if (child_role) { bs->inherits_from = parent; - flags = child_role->inherit_flags(parent->open_flags); + child_role->inherit_options(&flags, options, + parent->open_flags, parent->options); } - ret = bdrv_fill_options(&options, &filename, &flags, drv, &local_err); + ret = bdrv_fill_options(&options, filename, &flags, &local_err); if (local_err) { goto fail; } + bs->open_flags = flags; + bs->options = options; + options = qdict_clone_shallow(options); + /* Find the right image format driver */ - drv = NULL; drvname = qdict_get_try_str(options, "driver"); if (drvname) { drv = bdrv_find_format(drvname); - qdict_del(options, "driver"); if (!drv) { error_setg(errp, "Unknown driver: '%s'", drvname); ret = -EINVAL; @@ -1494,9 +1586,11 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, assert(drvname || !(flags & BDRV_O_PROTOCOL)); - bs->open_flags = flags; - bs->options = options; - options = qdict_clone_shallow(options); + backing = qdict_get_try_str(options, "backing"); + if (backing && *backing == '\0') { + flags |= BDRV_O_NO_BACKING; + qdict_del(options, "backing"); + } /* Open image file without format layer */ if ((flags & BDRV_O_PROTOCOL) == 0) { @@ -1504,15 +1598,18 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, flags |= BDRV_O_ALLOW_RDWR; } if (flags & BDRV_O_SNAPSHOT) { - snapshot_flags = bdrv_temp_snapshot_flags(flags); - flags = bdrv_backing_flags(flags); + snapshot_options = qdict_new(); + bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, + flags, options); + bdrv_backing_options(&flags, options, flags, options); } - assert(file == NULL); bs->open_flags = flags; - ret = bdrv_open_image(&file, filename, options, "file", - bs, &child_file, true, &local_err); - if (ret < 0) { + + file = bdrv_open_child(filename, options, "file", bs, + &child_file, true, &local_err); + if (local_err) { + ret = -EINVAL; goto fail; } } @@ -1520,10 +1617,23 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, /* Image format probing */ bs->probed = !drv; if (!drv && file) { - ret = find_image_format(file, filename, &drv, &local_err); + ret = find_image_format(file->bs, filename, &drv, &local_err); if (ret < 0) { goto fail; } + /* + * This option update would logically belong in bdrv_fill_options(), + * but we first need to open bs->file for the probing to work, while + * opening bs->file already requires the (mostly) final set of options + * so that cache mode etc. can be inherited. + * + * Adding the driver later is somewhat ugly, but it's not an option + * that would ever be inherited, so it's correct. We just need to make + * sure to update both bs->options (which has the full effective + * options for bs) and options (which has file.* already removed). + */ + qdict_put(bs->options, "driver", qstring_from_str(drv->format_name)); + qdict_put(options, "driver", qstring_from_str(drv->format_name)); } else if (!drv) { error_setg(errp, "Must specify either driver or file"); ret = -EINVAL; @@ -1537,22 +1647,19 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, assert(!(flags & BDRV_O_PROTOCOL) || !file); /* Open the image */ - ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); + ret = bdrv_open_common(bs, file, options, &local_err); if (ret < 0) { goto fail; } if (file && (bs->file != file)) { - bdrv_unref(file); + bdrv_unref_child(bs, file); file = NULL; } /* If there is a backing file, use it */ if ((flags & BDRV_O_NO_BACKING) == 0) { - QDict *backing_options; - - qdict_extract_subqdict(options, &backing_options, "backing."); - ret = bdrv_open_backing_file(bs, backing_options, &local_err); + ret = bdrv_open_backing_file(bs, options, "backing", &local_err); if (ret < 0) { goto close_and_fail; } @@ -1560,15 +1667,6 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, bdrv_refresh_filename(bs); - /* For snapshot=on, create a temporary qcow2 overlay. bs points to the - * temporary snapshot afterwards. */ - if (snapshot_flags) { - ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); - if (local_err) { - goto close_and_fail; - } - } - /* Check if any unknown options were used */ if (options && (qdict_size(options) != 0)) { const QDictEntry *entry = qdict_first(options); @@ -1576,9 +1674,9 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, error_setg(errp, "Block protocol '%s' doesn't support the option " "'%s'", drv->format_name, entry->key); } else { - error_setg(errp, "Block format '%s' used by device '%s' doesn't " - "support the option '%s'", drv->format_name, - bdrv_get_device_name(bs), entry->key); + error_setg(errp, + "Block format '%s' does not support the option '%s'", + drv->format_name, entry->key); } ret = -EINVAL; @@ -1600,12 +1698,26 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, QDECREF(options); *pbs = bs; + + /* For snapshot=on, create a temporary qcow2 overlay. bs points to the + * temporary snapshot afterwards. */ + if (snapshot_flags) { + ret = bdrv_append_temp_snapshot(bs, snapshot_flags, snapshot_options, + &local_err); + snapshot_options = NULL; + if (local_err) { + goto close_and_fail; + } + } + return 0; fail: if (file != NULL) { - bdrv_unref(file); + bdrv_unref_child(bs, file); } + QDECREF(snapshot_options); + QDECREF(bs->explicit_options); QDECREF(bs->options); QDECREF(options); bs->options = NULL; @@ -1627,6 +1739,7 @@ close_and_fail: } else { bdrv_unref(bs); } + QDECREF(snapshot_options); QDECREF(options); if (local_err) { error_propagate(errp, local_err); @@ -1635,11 +1748,10 @@ close_and_fail: } int bdrv_open(BlockDriverState **pbs, const char *filename, - const char *reference, QDict *options, int flags, - BlockDriver *drv, Error **errp) + const char *reference, QDict *options, int flags, Error **errp) { return bdrv_open_inherit(pbs, filename, reference, options, flags, NULL, - NULL, drv, errp); + NULL, errp); } typedef struct BlockReopenQueueEntry { @@ -1660,48 +1772,116 @@ typedef struct BlockReopenQueueEntry { * * bs is the BlockDriverState to add to the reopen queue. * + * options contains the changed options for the associated bs + * (the BlockReopenQueue takes ownership) + * * flags contains the open flags for the associated bs * * returns a pointer to bs_queue, which is either the newly allocated * bs_queue, or the existing bs_queue being used. * */ -BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, - BlockDriverState *bs, int flags) +static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, + BlockDriverState *bs, + QDict *options, + int flags, + const BdrvChildRole *role, + QDict *parent_options, + int parent_flags) { assert(bs != NULL); BlockReopenQueueEntry *bs_entry; BdrvChild *child; + QDict *old_options, *explicit_options; if (bs_queue == NULL) { bs_queue = g_new0(BlockReopenQueue, 1); QSIMPLEQ_INIT(bs_queue); } + if (!options) { + options = qdict_new(); + } + + /* + * Precedence of options: + * 1. Explicitly passed in options (highest) + * 2. Set in flags (only for top level) + * 3. Retained from explicitly set options of bs + * 4. Inherited from parent node + * 5. Retained from effective options of bs + */ + + if (!parent_options) { + /* + * Any setting represented by flags is always updated. If the + * corresponding QDict option is set, it takes precedence. Otherwise + * the flag is translated into a QDict option. The old setting of bs is + * not considered. + */ + update_options_from_flags(options, flags); + } + + /* Old explicitly set values (don't overwrite by inherited value) */ + old_options = qdict_clone_shallow(bs->explicit_options); + bdrv_join_options(bs, options, old_options); + QDECREF(old_options); + + explicit_options = qdict_clone_shallow(options); + + /* Inherit from parent node */ + if (parent_options) { + assert(!flags); + role->inherit_options(&flags, options, parent_flags, parent_options); + } + + /* Old values are used for options that aren't set yet */ + old_options = qdict_clone_shallow(bs->options); + bdrv_join_options(bs, options, old_options); + QDECREF(old_options); + /* bdrv_open() masks this flag out */ flags &= ~BDRV_O_PROTOCOL; QLIST_FOREACH(child, &bs->children, next) { - int child_flags; + QDict *new_child_options; + char *child_key_dot; + /* reopen can only change the options of block devices that were + * implicitly created and inherited options. For other (referenced) + * block devices, a syntax like "backing.foo" results in an error. */ if (child->bs->inherits_from != bs) { continue; } - child_flags = child->role->inherit_flags(flags); - bdrv_reopen_queue(bs_queue, child->bs, child_flags); + child_key_dot = g_strdup_printf("%s.", child->name); + qdict_extract_subqdict(options, &new_child_options, child_key_dot); + g_free(child_key_dot); + + bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, 0, + child->role, options, flags); } bs_entry = g_new0(BlockReopenQueueEntry, 1); QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); bs_entry->state.bs = bs; + bs_entry->state.options = options; + bs_entry->state.explicit_options = explicit_options; bs_entry->state.flags = flags; return bs_queue; } +BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, + BlockDriverState *bs, + QDict *options, int flags) +{ + return bdrv_reopen_queue_child(bs_queue, bs, options, flags, + NULL, NULL, 0); +} + /* * Reopen multiple BlockDriverStates atomically & transactionally. * @@ -1748,7 +1928,10 @@ cleanup: QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { if (ret && bs_entry->prepared) { bdrv_reopen_abort(&bs_entry->state); + } else if (ret) { + QDECREF(bs_entry->state.explicit_options); } + QDECREF(bs_entry->state.options); g_free(bs_entry); } g_free(bs_queue); @@ -1761,7 +1944,7 @@ int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) { int ret = -1; Error *local_err = NULL; - BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); + BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, NULL, bdrv_flags); ret = bdrv_reopen_multiple(queue, &local_err); if (local_err != NULL) { @@ -1794,11 +1977,36 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, int ret = -1; Error *local_err = NULL; BlockDriver *drv; + QemuOpts *opts; + const char *value; assert(reopen_state != NULL); assert(reopen_state->bs->drv != NULL); drv = reopen_state->bs->drv; + /* Process generic block layer options */ + opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); + qemu_opts_absorb_qdict(opts, reopen_state->options, &local_err); + if (local_err) { + error_propagate(errp, local_err); + ret = -EINVAL; + goto error; + } + + update_flags_from_options(&reopen_state->flags, opts); + + /* node-name and driver must be unchanged. Put them back into the QDict, so + * that they are checked at the end of this function. */ + value = qemu_opt_get(opts, "node-name"); + if (value) { + qdict_put(reopen_state->options, "node-name", qstring_from_str(value)); + } + + value = qemu_opt_get(opts, "driver"); + if (value) { + qdict_put(reopen_state->options, "driver", qstring_from_str(value)); + } + /* if we are to stay read-only, do not allow permission change * to r/w */ if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && @@ -1811,8 +2019,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, ret = bdrv_flush(reopen_state->bs); if (ret) { - error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", - strerror(-ret)); + error_setg_errno(errp, -ret, "Error flushing drive"); goto error; } @@ -1837,9 +2044,30 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, goto error; } + /* Options that are not handled are only okay if they are unchanged + * compared to the old state. It is expected that some options are only + * used for the initial open, but not reopen (e.g. filename) */ + if (qdict_size(reopen_state->options)) { + const QDictEntry *entry = qdict_first(reopen_state->options); + + do { + QString *new_obj = qobject_to_qstring(entry->value); + const char *new = qstring_get_str(new_obj); + const char *old = qdict_get_try_str(reopen_state->bs->options, + entry->key); + + if (!old || strcmp(new, old)) { + error_setg(errp, "Cannot change the option '%s'", entry->key); + ret = -EINVAL; + goto error; + } + } while ((entry = qdict_next(reopen_state->options, entry))); + } + ret = 0; error: + qemu_opts_del(opts); return ret; } @@ -1862,9 +2090,10 @@ void bdrv_reopen_commit(BDRVReopenState *reopen_state) } /* set BDS specific flags now */ + QDECREF(reopen_state->bs->explicit_options); + + reopen_state->bs->explicit_options = reopen_state->explicit_options; reopen_state->bs->open_flags = reopen_state->flags; - reopen_state->bs->enable_write_cache = !!(reopen_state->flags & - BDRV_O_CACHE_WB); reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); bdrv_refresh_limits(reopen_state->bs, NULL); @@ -1885,30 +2114,44 @@ void bdrv_reopen_abort(BDRVReopenState *reopen_state) if (drv->bdrv_reopen_abort) { drv->bdrv_reopen_abort(reopen_state); } + + QDECREF(reopen_state->explicit_options); } -void bdrv_close(BlockDriverState *bs) +static void bdrv_close(BlockDriverState *bs) { BdrvAioNotifier *ban, *ban_next; - if (bs->job) { - block_job_cancel_sync(bs->job); + assert(!bs->job); + + /* Disable I/O limits and drain all pending throttled requests */ + if (bs->throttle_state) { + bdrv_io_limits_disable(bs); } - bdrv_drain(bs); /* complete I/O */ + + bdrv_drained_begin(bs); /* complete I/O */ bdrv_flush(bs); bdrv_drain(bs); /* in case flush left pending I/O */ - notifier_list_notify(&bs->close_notifiers, bs); + + bdrv_release_named_dirty_bitmaps(bs); + assert(QLIST_EMPTY(&bs->dirty_bitmaps)); + + if (bs->blk) { + blk_dev_change_media_cb(bs->blk, false); + } if (bs->drv) { BdrvChild *child, *next; bs->drv->bdrv_close(bs); + bs->drv = NULL; + + bdrv_set_backing_hd(bs, NULL); - if (bs->backing_hd) { - BlockDriverState *backing_hd = bs->backing_hd; - bdrv_set_backing_hd(bs, NULL); - bdrv_unref(backing_hd); + if (bs->file != NULL) { + bdrv_unref_child(bs, bs->file); + bs->file = NULL; } QLIST_FOREACH_SAFE(child, &bs->children, next, next) { @@ -1922,7 +2165,6 @@ void bdrv_close(BlockDriverState *bs) g_free(bs->opaque); bs->opaque = NULL; - bs->drv = NULL; bs->copy_on_read = 0; bs->backing_file[0] = '\0'; bs->backing_format[0] = '\0'; @@ -1932,227 +2174,97 @@ void bdrv_close(BlockDriverState *bs) bs->sg = 0; bs->zero_beyond_eof = false; QDECREF(bs->options); + QDECREF(bs->explicit_options); bs->options = NULL; QDECREF(bs->full_open_options); bs->full_open_options = NULL; - - if (bs->file != NULL) { - bdrv_unref(bs->file); - bs->file = NULL; - } - } - - if (bs->blk) { - blk_dev_change_media_cb(bs->blk, false); - } - - /*throttling disk I/O limits*/ - if (bs->io_limits_enabled) { - bdrv_io_limits_disable(bs); } QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { g_free(ban); } QLIST_INIT(&bs->aio_notifiers); + bdrv_drained_end(bs); } void bdrv_close_all(void) { BlockDriverState *bs; + AioContext *aio_context; - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { - AioContext *aio_context = bdrv_get_aio_context(bs); + /* Drop references from requests still in flight, such as canceled block + * jobs whose AIO context has not been polled yet */ + bdrv_drain_all(); - aio_context_acquire(aio_context); - bdrv_close(bs); - aio_context_release(aio_context); - } -} + blk_remove_all_bs(); + blockdev_close_all_bdrv_states(); -/* make a BlockDriverState anonymous by removing from bdrv_state and - * graph_bdrv_state list. - Also, NULL terminate the device_name to prevent double remove */ -void bdrv_make_anon(BlockDriverState *bs) -{ - /* - * Take care to remove bs from bdrv_states only when it's actually - * in it. Note that bs->device_list.tqe_prev is initially null, - * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish - * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by - * resetting it to null on remove. - */ - if (bs->device_list.tqe_prev) { - QTAILQ_REMOVE(&bdrv_states, bs, device_list); - bs->device_list.tqe_prev = NULL; - } - if (bs->node_name[0] != '\0') { - QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); - } - bs->node_name[0] = '\0'; -} + /* Cancel all block jobs */ + while (!QTAILQ_EMPTY(&all_bdrv_states)) { + QTAILQ_FOREACH(bs, &all_bdrv_states, bs_list) { + aio_context = bdrv_get_aio_context(bs); -static void bdrv_rebind(BlockDriverState *bs) -{ - if (bs->drv && bs->drv->bdrv_rebind) { - bs->drv->bdrv_rebind(bs); + aio_context_acquire(aio_context); + if (bs->job) { + block_job_cancel_sync(bs->job); + aio_context_release(aio_context); + break; + } + aio_context_release(aio_context); + } + + /* All the remaining BlockDriverStates are referenced directly or + * indirectly from block jobs, so there needs to be at least one BDS + * directly used by a block job */ + assert(bs); } } +/* Fields that need to stay with the top-level BDS */ static void bdrv_move_feature_fields(BlockDriverState *bs_dest, BlockDriverState *bs_src) { /* move some fields that need to stay attached to the device */ - - /* dev info */ - bs_dest->guest_block_size = bs_src->guest_block_size; - bs_dest->copy_on_read = bs_src->copy_on_read; - - bs_dest->enable_write_cache = bs_src->enable_write_cache; - - /* i/o throttled req */ - bs_dest->throttle_state = bs_src->throttle_state, - bs_dest->io_limits_enabled = bs_src->io_limits_enabled; - bs_dest->pending_reqs[0] = bs_src->pending_reqs[0]; - bs_dest->pending_reqs[1] = bs_src->pending_reqs[1]; - bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; - bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; - memcpy(&bs_dest->round_robin, - &bs_src->round_robin, - sizeof(bs_dest->round_robin)); - memcpy(&bs_dest->throttle_timers, - &bs_src->throttle_timers, - sizeof(ThrottleTimers)); - - /* r/w error */ - bs_dest->on_read_error = bs_src->on_read_error; - bs_dest->on_write_error = bs_src->on_write_error; - - /* i/o status */ - bs_dest->iostatus_enabled = bs_src->iostatus_enabled; - bs_dest->iostatus = bs_src->iostatus; - - /* dirty bitmap */ - bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; - - /* reference count */ - bs_dest->refcnt = bs_src->refcnt; - - /* job */ - bs_dest->job = bs_src->job; - - /* keep the same entry in bdrv_states */ - bs_dest->device_list = bs_src->device_list; - bs_dest->blk = bs_src->blk; - - memcpy(bs_dest->op_blockers, bs_src->op_blockers, - sizeof(bs_dest->op_blockers)); } -/* - * Swap bs contents for two image chains while they are live, - * while keeping required fields on the BlockDriverState that is - * actually attached to a device. - * - * This will modify the BlockDriverState fields, and swap contents - * between bs_new and bs_old. Both bs_new and bs_old are modified. - * - * bs_new must not be attached to a BlockBackend. - * - * This function does not create any image files. - */ -void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) +static void change_parent_backing_link(BlockDriverState *from, + BlockDriverState *to) { - BlockDriverState tmp; - BdrvChild *child; - - bdrv_drain(bs_new); - bdrv_drain(bs_old); + BdrvChild *c, *next; - /* 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 - * insert them back if needed. - */ - if (bs_new->node_name[0] != '\0') { - QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); - } - if (bs_old->node_name[0] != '\0') { - QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); + if (from->blk) { + /* FIXME We bypass blk_set_bs(), so we need to make these updates + * manually. The root problem is not in this change function, but the + * existence of BlockDriverState.blk. */ + to->blk = from->blk; + from->blk = NULL; } - /* If the BlockDriverState is part of a throttling group acquire - * its lock since we're going to mess with the protected fields. - * Otherwise there's no need to worry since no one else can touch - * them. */ - if (bs_old->throttle_state) { - throttle_group_lock(bs_old); + QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { + assert(c->role != &child_backing); + c->bs = to; + QLIST_REMOVE(c, next_parent); + QLIST_INSERT_HEAD(&to->parents, c, next_parent); + bdrv_ref(to); + bdrv_unref(from); } +} - /* bs_new must be unattached and shouldn't have anything fancy enabled */ - assert(!bs_new->blk); - assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); - assert(bs_new->job == NULL); - assert(bs_new->io_limits_enabled == false); - assert(bs_new->throttle_state == NULL); - assert(!throttle_timers_are_initialized(&bs_new->throttle_timers)); - - tmp = *bs_new; - *bs_new = *bs_old; - *bs_old = tmp; +static void swap_feature_fields(BlockDriverState *bs_top, + BlockDriverState *bs_new) +{ + BlockDriverState tmp; - /* there are some fields that should not be swapped, move them back */ - bdrv_move_feature_fields(&tmp, bs_old); - bdrv_move_feature_fields(bs_old, bs_new); + bdrv_move_feature_fields(&tmp, bs_top); + bdrv_move_feature_fields(bs_top, bs_new); bdrv_move_feature_fields(bs_new, &tmp); - /* bs_new must remain unattached */ - assert(!bs_new->blk); - - /* Check a few fields that should remain attached to the device */ - assert(bs_new->job == NULL); - assert(bs_new->io_limits_enabled == false); - assert(bs_new->throttle_state == NULL); - assert(!throttle_timers_are_initialized(&bs_new->throttle_timers)); - - /* Release the ThrottleGroup lock */ - if (bs_old->throttle_state) { - throttle_group_unlock(bs_old); - } - - /* insert the nodes back into the graph node list if needed */ - if (bs_new->node_name[0] != '\0') { - QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); - } - if (bs_old->node_name[0] != '\0') { - 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; - } + assert(!bs_new->throttle_state); + if (bs_top->throttle_state) { + assert(bs_top->io_limits_enabled); + bdrv_io_limits_enable(bs_new, throttle_group_get_name(bs_top)); + bdrv_io_limits_disable(bs_top); } - 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); } /* @@ -2165,14 +2277,59 @@ void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) * bs_new must not be attached to a BlockBackend. * * This function does not create any image files. + * + * bdrv_append() takes ownership of a bs_new reference and unrefs it because + * that's what the callers commonly need. bs_new will be referenced by the old + * parents of bs_top after bdrv_append() returns. If the caller needs to keep a + * reference of its own, it must call bdrv_ref(). */ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) { - bdrv_swap(bs_new, bs_top); + assert(!bdrv_requests_pending(bs_top)); + assert(!bdrv_requests_pending(bs_new)); + + bdrv_ref(bs_top); + change_parent_backing_link(bs_top, bs_new); + + /* Some fields always stay on top of the backing file chain */ + swap_feature_fields(bs_top, bs_new); - /* 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_set_backing_hd(bs_new, bs_top); + bdrv_unref(bs_top); + + /* bs_new is now referenced by its new parents, we don't need the + * additional reference any more. */ + bdrv_unref(bs_new); +} + +void bdrv_replace_in_backing_chain(BlockDriverState *old, BlockDriverState *new) +{ + assert(!bdrv_requests_pending(old)); + assert(!bdrv_requests_pending(new)); + + bdrv_ref(old); + + if (old->blk) { + /* As long as these fields aren't in BlockBackend, but in the top-level + * BlockDriverState, it's not possible for a BDS to have two BBs. + * + * We really want to copy the fields from old to new, but we go for a + * swap instead so that pointers aren't duplicated and cause trouble. + * (Also, bdrv_swap() used to do the same.) */ + assert(!new->blk); + swap_feature_fields(old, new); + } + change_parent_backing_link(old, new); + + /* Change backing files if a previously independent node is added to the + * chain. For active commit, we replace top by its own (indirect) backing + * file and don't do anything here so we don't build a loop. */ + if (new->backing == NULL && !bdrv_chain_contains(backing_bs(old), new)) { + bdrv_set_backing_hd(new, backing_bs(old)); + bdrv_set_backing_hd(old, NULL); + } + + bdrv_unref(old); } static void bdrv_delete(BlockDriverState *bs) @@ -2180,12 +2337,14 @@ static void bdrv_delete(BlockDriverState *bs) assert(!bs->job); assert(bdrv_op_blocker_is_empty(bs)); assert(!bs->refcnt); - assert(QLIST_EMPTY(&bs->dirty_bitmaps)); bdrv_close(bs); /* remove from list, if necessary */ - bdrv_make_anon(bs); + if (bs->node_name[0] != '\0') { + QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); + } + QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); g_free(bs); } @@ -2224,20 +2383,20 @@ int bdrv_commit(BlockDriverState *bs) if (!drv) return -ENOMEDIUM; - if (!bs->backing_hd) { + if (!bs->backing) { return -ENOTSUP; } if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) || - bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { + bdrv_op_is_blocked(bs->backing->bs, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { return -EBUSY; } - ro = bs->backing_hd->read_only; - open_flags = bs->backing_hd->open_flags; + ro = bs->backing->bs->read_only; + open_flags = bs->backing->bs->open_flags; if (ro) { - if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { + if (bdrv_reopen(bs->backing->bs, open_flags | BDRV_O_RDWR, NULL)) { return -EACCES; } } @@ -2248,7 +2407,7 @@ int bdrv_commit(BlockDriverState *bs) goto ro_cleanup; } - backing_length = bdrv_getlength(bs->backing_hd); + backing_length = bdrv_getlength(bs->backing->bs); if (backing_length < 0) { ret = backing_length; goto ro_cleanup; @@ -2258,7 +2417,7 @@ int bdrv_commit(BlockDriverState *bs) * grow the backing file image if possible. If not possible, * we must return an error */ if (length > backing_length) { - ret = bdrv_truncate(bs->backing_hd, length); + ret = bdrv_truncate(bs->backing->bs, length); if (ret < 0) { goto ro_cleanup; } @@ -2267,7 +2426,7 @@ int bdrv_commit(BlockDriverState *bs) total_sectors = length >> BDRV_SECTOR_BITS; /* qemu_try_blockalign() for bs will choose an alignment that works for - * bs->backing_hd as well, so no need to compare the alignment manually. */ + * bs->backing->bs as well, so no need to compare the alignment manually. */ buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); if (buf == NULL) { ret = -ENOMEM; @@ -2285,7 +2444,7 @@ int bdrv_commit(BlockDriverState *bs) goto ro_cleanup; } - ret = bdrv_write(bs->backing_hd, sector, buf, n); + ret = bdrv_write(bs->backing->bs, sector, buf, n); if (ret < 0) { goto ro_cleanup; } @@ -2304,8 +2463,8 @@ int bdrv_commit(BlockDriverState *bs) * Make sure all data we wrote to the backing device is actually * stable on disk. */ - if (bs->backing_hd) { - bdrv_flush(bs->backing_hd); + if (bs->backing) { + bdrv_flush(bs->backing->bs); } ret = 0; @@ -2314,32 +2473,12 @@ ro_cleanup: if (ro) { /* ignoring error return here */ - bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); + bdrv_reopen(bs->backing->bs, open_flags & ~BDRV_O_RDWR, NULL); } return ret; } -int bdrv_commit_all(void) -{ - BlockDriverState *bs; - - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { - AioContext *aio_context = bdrv_get_aio_context(bs); - - aio_context_acquire(aio_context); - if (bs->drv && bs->backing_hd) { - int ret = bdrv_commit(bs); - if (ret < 0) { - aio_context_release(aio_context); - return ret; - } - } - aio_context_release(aio_context); - } - return 0; -} - /* * Return values: * 0 - success @@ -2385,8 +2524,8 @@ int bdrv_change_backing_file(BlockDriverState *bs, BlockDriverState *bdrv_find_overlay(BlockDriverState *active, BlockDriverState *bs) { - while (active && bs != active->backing_hd) { - active = active->backing_hd; + while (active && bs != backing_bs(active)) { + active = backing_bs(active); } return active; @@ -2398,12 +2537,6 @@ BlockDriverState *bdrv_find_base(BlockDriverState *bs) return bdrv_find_overlay(bs, NULL); } -typedef struct BlkIntermediateStates { - BlockDriverState *bs; - QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; -} BlkIntermediateStates; - - /* * Drops images above 'base' up to and including 'top', and sets the image * above 'top' to have base as its backing file. @@ -2436,15 +2569,9 @@ typedef struct BlkIntermediateStates { int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, BlockDriverState *base, const char *backing_file_str) { - BlockDriverState *intermediate; - BlockDriverState *base_bs = NULL; BlockDriverState *new_top_bs = NULL; - BlkIntermediateStates *intermediate_state, *next; int ret = -EIO; - QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; - QSIMPLEQ_INIT(&states_to_delete); - if (!top->drv || !base->drv) { goto exit; } @@ -2456,55 +2583,29 @@ int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, goto exit; } - /* special case of new_top_bs->backing_hd already pointing to base - nothing + /* special case of new_top_bs->backing->bs already pointing to base - nothing * to do, no intermediate images */ - if (new_top_bs->backing_hd == base) { + if (backing_bs(new_top_bs) == base) { ret = 0; goto exit; } - intermediate = top; - - /* now we will go down through the list, and add each BDS we find - * into our deletion queue, until we hit the 'base' - */ - while (intermediate) { - intermediate_state = g_new0(BlkIntermediateStates, 1); - intermediate_state->bs = intermediate; - QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); - - if (intermediate->backing_hd == base) { - base_bs = intermediate->backing_hd; - break; - } - intermediate = intermediate->backing_hd; - } - if (base_bs == NULL) { - /* something went wrong, we did not end at the base. safely - * unravel everything, and exit with error */ + /* Make sure that base is in the backing chain of top */ + if (!bdrv_chain_contains(top, base)) { goto exit; } /* success - we can delete the intermediate states, and link top->base */ - backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; + backing_file_str = backing_file_str ? backing_file_str : base->filename; ret = bdrv_change_backing_file(new_top_bs, backing_file_str, - base_bs->drv ? base_bs->drv->format_name : ""); + base->drv ? base->drv->format_name : ""); if (ret) { goto exit; } - bdrv_set_backing_hd(new_top_bs, base_bs); + bdrv_set_backing_hd(new_top_bs, base); - QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { - /* so that bdrv_close() does not recursively close the chain */ - bdrv_set_backing_hd(intermediate_state->bs, NULL); - bdrv_unref(intermediate_state->bs); - } ret = 0; - exit: - QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { - g_free(intermediate_state); - } return ret; } @@ -2547,7 +2648,7 @@ int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) return drv->bdrv_get_allocated_file_size(bs); } if (bs->file) { - return bdrv_get_allocated_file_size(bs->file); + return bdrv_get_allocated_file_size(bs->file->bs); } return -ENOTSUP; } @@ -2591,82 +2692,6 @@ void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; } -void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, - BlockdevOnError on_write_error) -{ - bs->on_read_error = on_read_error; - bs->on_write_error = on_write_error; -} - -BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) -{ - return is_read ? bs->on_read_error : bs->on_write_error; -} - -BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) -{ - BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; - - switch (on_err) { - case BLOCKDEV_ON_ERROR_ENOSPC: - return (error == ENOSPC) ? - BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; - case BLOCKDEV_ON_ERROR_STOP: - return BLOCK_ERROR_ACTION_STOP; - case BLOCKDEV_ON_ERROR_REPORT: - return BLOCK_ERROR_ACTION_REPORT; - case BLOCKDEV_ON_ERROR_IGNORE: - return BLOCK_ERROR_ACTION_IGNORE; - default: - abort(); - } -} - -static void send_qmp_error_event(BlockDriverState *bs, - BlockErrorAction action, - bool is_read, int error) -{ - IoOperationType optype; - - optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; - qapi_event_send_block_io_error(bdrv_get_device_name(bs), optype, action, - bdrv_iostatus_is_enabled(bs), - error == ENOSPC, strerror(error), - &error_abort); -} - -/* This is done by device models because, while the block layer knows - * about the error, it does not know whether an operation comes from - * the device or the block layer (from a job, for example). - */ -void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, - bool is_read, int error) -{ - assert(error >= 0); - - if (action == BLOCK_ERROR_ACTION_STOP) { - /* First set the iostatus, so that "info block" returns an iostatus - * that matches the events raised so far (an additional error iostatus - * is fine, but not a lost one). - */ - bdrv_iostatus_set_err(bs, error); - - /* Then raise the request to stop the VM and the event. - * qemu_system_vmstop_request_prepare has two effects. First, - * it ensures that the STOP event always comes after the - * BLOCK_IO_ERROR event. Second, it ensures that even if management - * can observe the STOP event and do a "cont" before the STOP - * event is issued, the VM will not stop. In this case, vm_start() - * also ensures that the STOP/RESUME pair of events is emitted. - */ - qemu_system_vmstop_request_prepare(); - send_qmp_error_event(bs, action, is_read, error); - qemu_system_vmstop_request(RUN_STATE_IO_ERROR); - } else { - send_qmp_error_event(bs, action, is_read, error); - } -} - int bdrv_is_read_only(BlockDriverState *bs) { return bs->read_only; @@ -2677,44 +2702,29 @@ int bdrv_is_sg(BlockDriverState *bs) return bs->sg; } -int bdrv_enable_write_cache(BlockDriverState *bs) -{ - return bs->enable_write_cache; -} - -void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) -{ - bs->enable_write_cache = wce; - - /* so a reopen() will preserve wce */ - if (wce) { - bs->open_flags |= BDRV_O_CACHE_WB; - } else { - bs->open_flags &= ~BDRV_O_CACHE_WB; - } -} - int bdrv_is_encrypted(BlockDriverState *bs) { - if (bs->backing_hd && bs->backing_hd->encrypted) + if (bs->backing && bs->backing->bs->encrypted) { return 1; + } return bs->encrypted; } int bdrv_key_required(BlockDriverState *bs) { - BlockDriverState *backing_hd = bs->backing_hd; + BdrvChild *backing = bs->backing; - if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) + if (backing && backing->bs->encrypted && !backing->bs->valid_key) { return 1; + } return (bs->encrypted && !bs->valid_key); } int bdrv_set_key(BlockDriverState *bs, const char *key) { int ret; - if (bs->backing_hd && bs->backing_hd->encrypted) { - ret = bdrv_set_key(bs->backing_hd, key); + if (bs->backing && bs->backing->bs->encrypted) { + ret = bdrv_set_key(bs->backing->bs, key); if (ret < 0) return ret; if (!bs->encrypted) @@ -2833,7 +2843,7 @@ BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) list = NULL; QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { - BlockDeviceInfo *info = bdrv_block_device_info(bs, errp); + BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, errp); if (!info) { qapi_free_BlockDeviceInfoList(list); return NULL; @@ -2858,7 +2868,12 @@ BlockDriverState *bdrv_lookup_bs(const char *device, blk = blk_by_name(device); if (blk) { - return blk_bs(blk); + bs = blk_bs(blk); + if (!bs) { + error_setg(errp, "Device '%s' has no medium", device); + } + + return bs; } } @@ -2881,7 +2896,7 @@ BlockDriverState *bdrv_lookup_bs(const char *device, bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) { while (top && top != base) { - top = top->backing_hd; + top = backing_bs(top); } return top != NULL; @@ -2895,12 +2910,23 @@ BlockDriverState *bdrv_next_node(BlockDriverState *bs) return QTAILQ_NEXT(bs, node_list); } +/* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by + * the monitor or attached to a BlockBackend */ BlockDriverState *bdrv_next(BlockDriverState *bs) { - if (!bs) { - return QTAILQ_FIRST(&bdrv_states); + if (!bs || bs->blk) { + bs = blk_next_root_bs(bs); + if (bs) { + return bs; + } } - return QTAILQ_NEXT(bs, device_list); + + /* Ignore all BDSs that are attached to a BlockBackend here; they have been + * handled by the above block already */ + do { + bs = bdrv_next_monitor_owned(bs); + } while (bs && bs->blk); + return bs; } const char *bdrv_get_node_name(const BlockDriverState *bs) @@ -2939,7 +2965,7 @@ int bdrv_has_zero_init(BlockDriverState *bs) /* If BS is a copy on write image, it is initialized to the contents of the base image, which may not be zeroes. */ - if (bs->backing_hd) { + if (bs->backing) { return 0; } if (bs->drv->bdrv_has_zero_init) { @@ -2954,7 +2980,7 @@ bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) { BlockDriverInfo bdi; - if (bs->backing_hd) { + if (bs->backing) { return false; } @@ -2969,7 +2995,7 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) { BlockDriverInfo bdi; - if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { + if (bs->backing || !(bs->open_flags & BDRV_O_UNMAP)) { return false; } @@ -2982,7 +3008,7 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) const char *bdrv_get_encrypted_filename(BlockDriverState *bs) { - if (bs->backing_hd && bs->backing_hd->encrypted) + if (bs->backing && bs->backing->bs->encrypted) return bs->backing_file; else if (bs->encrypted) return bs->filename; @@ -3016,7 +3042,7 @@ ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) return NULL; } -void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) +void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event) { if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { return; @@ -3029,7 +3055,7 @@ int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, const char *tag) { while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { - bs = bs->file; + bs = bs->file ? bs->file->bs : NULL; } if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { @@ -3042,7 +3068,7 @@ int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) { while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { - bs = bs->file; + bs = bs->file ? bs->file->bs : NULL; } if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { @@ -3055,7 +3081,7 @@ int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) int bdrv_debug_resume(BlockDriverState *bs, const char *tag) { while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { - bs = bs->file; + bs = bs->file ? bs->file->bs : NULL; } if (bs && bs->drv && bs->drv->bdrv_debug_resume) { @@ -3068,7 +3094,7 @@ int bdrv_debug_resume(BlockDriverState *bs, const char *tag) bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) { while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { - bs = bs->file; + bs = bs->file ? bs->file->bs : NULL; } if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { @@ -3107,13 +3133,13 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, is_protocol = path_has_protocol(backing_file); - for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { + for (curr_bs = bs; curr_bs->backing; curr_bs = curr_bs->backing->bs) { /* If either of the filename paths is actually a protocol, then * compare unmodified paths; otherwise make paths relative */ if (is_protocol || path_has_protocol(curr_bs->backing_file)) { if (strcmp(backing_file, curr_bs->backing_file) == 0) { - retval = curr_bs->backing_hd; + retval = curr_bs->backing->bs; break; } } else { @@ -3137,7 +3163,7 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, } if (strcmp(backing_file_full, filename_full) == 0) { - retval = curr_bs->backing_hd; + retval = curr_bs->backing->bs; break; } } @@ -3155,11 +3181,11 @@ int bdrv_get_backing_file_depth(BlockDriverState *bs) return 0; } - if (!bs->backing_hd) { + if (!bs->backing) { return 0; } - return 1 + bdrv_get_backing_file_depth(bs->backing_hd); + return 1 + bdrv_get_backing_file_depth(bs->backing->bs); } void bdrv_init(void) @@ -3182,23 +3208,25 @@ void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) return; } - if (!(bs->open_flags & BDRV_O_INCOMING)) { + if (!(bs->open_flags & BDRV_O_INACTIVE)) { return; } - bs->open_flags &= ~BDRV_O_INCOMING; + bs->open_flags &= ~BDRV_O_INACTIVE; if (bs->drv->bdrv_invalidate_cache) { bs->drv->bdrv_invalidate_cache(bs, &local_err); } else if (bs->file) { - bdrv_invalidate_cache(bs->file, &local_err); + bdrv_invalidate_cache(bs->file->bs, &local_err); } if (local_err) { + bs->open_flags |= BDRV_O_INACTIVE; error_propagate(errp, local_err); return; } ret = refresh_total_sectors(bs, bs->total_sectors); if (ret < 0) { + bs->open_flags |= BDRV_O_INACTIVE; error_setg_errno(errp, -ret, "Could not refresh total sector count"); return; } @@ -3206,10 +3234,10 @@ void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) void bdrv_invalidate_cache_all(Error **errp) { - BlockDriverState *bs; + BlockDriverState *bs = NULL; Error *local_err = NULL; - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { + while ((bs = bdrv_next(bs)) != NULL) { AioContext *aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); @@ -3222,21 +3250,63 @@ void bdrv_invalidate_cache_all(Error **errp) } } +static int bdrv_inactivate(BlockDriverState *bs) +{ + int ret; + + if (bs->drv->bdrv_inactivate) { + ret = bs->drv->bdrv_inactivate(bs); + if (ret < 0) { + return ret; + } + } + + bs->open_flags |= BDRV_O_INACTIVE; + return 0; +} + +int bdrv_inactivate_all(void) +{ + BlockDriverState *bs = NULL; + int ret; + + while ((bs = bdrv_next(bs)) != NULL) { + AioContext *aio_context = bdrv_get_aio_context(bs); + + aio_context_acquire(aio_context); + ret = bdrv_inactivate(bs); + aio_context_release(aio_context); + if (ret < 0) { + return ret; + } + } + + return 0; +} + /**************************************************************/ /* removable device support */ /** * Return TRUE if the media is present */ -int bdrv_is_inserted(BlockDriverState *bs) +bool bdrv_is_inserted(BlockDriverState *bs) { BlockDriver *drv = bs->drv; + BdrvChild *child; - if (!drv) - return 0; - if (!drv->bdrv_is_inserted) - return 1; - return drv->bdrv_is_inserted(bs); + if (!drv) { + return false; + } + if (drv->bdrv_is_inserted) { + return drv->bdrv_is_inserted(bs); + } + QLIST_FOREACH(child, &bs->children, next) { + if (!bdrv_is_inserted(child->bs)) { + return false; + } + } + return true; } /** @@ -3287,317 +3357,6 @@ void bdrv_lock_medium(BlockDriverState *bs, bool locked) } } -void bdrv_set_guest_block_size(BlockDriverState *bs, int align) -{ - bs->guest_block_size = align; -} - -BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name) -{ - BdrvDirtyBitmap *bm; - - assert(name); - QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { - if (bm->name && !strcmp(name, bm->name)) { - return bm; - } - } - return NULL; -} - -void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap) -{ - assert(!bdrv_dirty_bitmap_frozen(bitmap)); - g_free(bitmap->name); - bitmap->name = NULL; -} - -BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, - uint32_t granularity, - const char *name, - Error **errp) -{ - int64_t bitmap_size; - BdrvDirtyBitmap *bitmap; - uint32_t sector_granularity; - - assert((granularity & (granularity - 1)) == 0); - - if (name && bdrv_find_dirty_bitmap(bs, name)) { - error_setg(errp, "Bitmap already exists: %s", name); - return NULL; - } - sector_granularity = granularity >> BDRV_SECTOR_BITS; - assert(sector_granularity); - bitmap_size = bdrv_nb_sectors(bs); - if (bitmap_size < 0) { - error_setg_errno(errp, -bitmap_size, "could not get length of device"); - errno = -bitmap_size; - return NULL; - } - bitmap = g_new0(BdrvDirtyBitmap, 1); - bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity)); - bitmap->size = bitmap_size; - bitmap->name = g_strdup(name); - bitmap->disabled = false; - QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); - return bitmap; -} - -bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap) -{ - return bitmap->successor; -} - -bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap) -{ - return !(bitmap->disabled || bitmap->successor); -} - -DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap) -{ - if (bdrv_dirty_bitmap_frozen(bitmap)) { - return DIRTY_BITMAP_STATUS_FROZEN; - } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { - return DIRTY_BITMAP_STATUS_DISABLED; - } else { - return DIRTY_BITMAP_STATUS_ACTIVE; - } -} - -/** - * Create a successor bitmap destined to replace this bitmap after an operation. - * Requires that the bitmap is not frozen and has no successor. - */ -int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, - BdrvDirtyBitmap *bitmap, Error **errp) -{ - uint64_t granularity; - BdrvDirtyBitmap *child; - - if (bdrv_dirty_bitmap_frozen(bitmap)) { - error_setg(errp, "Cannot create a successor for a bitmap that is " - "currently frozen"); - return -1; - } - assert(!bitmap->successor); - - /* Create an anonymous successor */ - granularity = bdrv_dirty_bitmap_granularity(bitmap); - child = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); - if (!child) { - return -1; - } - - /* Successor will be on or off based on our current state. */ - child->disabled = bitmap->disabled; - - /* Install the successor and freeze the parent */ - bitmap->successor = child; - return 0; -} - -/** - * For a bitmap with a successor, yield our name to the successor, - * delete the old bitmap, and return a handle to the new bitmap. - */ -BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, - BdrvDirtyBitmap *bitmap, - Error **errp) -{ - char *name; - BdrvDirtyBitmap *successor = bitmap->successor; - - if (successor == NULL) { - error_setg(errp, "Cannot relinquish control if " - "there's no successor present"); - return NULL; - } - - name = bitmap->name; - bitmap->name = NULL; - successor->name = name; - bitmap->successor = NULL; - bdrv_release_dirty_bitmap(bs, bitmap); - - return successor; -} - -/** - * In cases of failure where we can no longer safely delete the parent, - * we may wish to re-join the parent and child/successor. - * The merged parent will be un-frozen, but not explicitly re-enabled. - */ -BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, - BdrvDirtyBitmap *parent, - Error **errp) -{ - BdrvDirtyBitmap *successor = parent->successor; - - if (!successor) { - error_setg(errp, "Cannot reclaim a successor when none is present"); - return NULL; - } - - if (!hbitmap_merge(parent->bitmap, successor->bitmap)) { - error_setg(errp, "Merging of parent and successor bitmap failed"); - return NULL; - } - bdrv_release_dirty_bitmap(bs, successor); - parent->successor = NULL; - - return parent; -} - -/** - * Truncates _all_ bitmaps attached to a BDS. - */ -static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) -{ - BdrvDirtyBitmap *bitmap; - uint64_t size = bdrv_nb_sectors(bs); - - QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { - assert(!bdrv_dirty_bitmap_frozen(bitmap)); - hbitmap_truncate(bitmap->bitmap, size); - bitmap->size = size; - } -} - -void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) -{ - BdrvDirtyBitmap *bm, *next; - QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { - if (bm == bitmap) { - assert(!bdrv_dirty_bitmap_frozen(bm)); - QLIST_REMOVE(bitmap, list); - hbitmap_free(bitmap->bitmap); - g_free(bitmap->name); - g_free(bitmap); - return; - } - } -} - -void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap) -{ - assert(!bdrv_dirty_bitmap_frozen(bitmap)); - bitmap->disabled = true; -} - -void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap) -{ - assert(!bdrv_dirty_bitmap_frozen(bitmap)); - bitmap->disabled = false; -} - -BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) -{ - BdrvDirtyBitmap *bm; - BlockDirtyInfoList *list = NULL; - BlockDirtyInfoList **plist = &list; - - QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { - BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); - BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); - info->count = bdrv_get_dirty_count(bm); - info->granularity = bdrv_dirty_bitmap_granularity(bm); - info->has_name = !!bm->name; - info->name = g_strdup(bm->name); - info->status = bdrv_dirty_bitmap_status(bm); - entry->value = info; - *plist = entry; - plist = &entry->next; - } - - return list; -} - -int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) -{ - if (bitmap) { - return hbitmap_get(bitmap->bitmap, sector); - } else { - return 0; - } -} - -/** - * Chooses a default granularity based on the existing cluster size, - * but clamped between [4K, 64K]. Defaults to 64K in the case that there - * is no cluster size information available. - */ -uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs) -{ - BlockDriverInfo bdi; - uint32_t granularity; - - if (bdrv_get_info(bs, &bdi) >= 0 && bdi.cluster_size > 0) { - granularity = MAX(4096, bdi.cluster_size); - granularity = MIN(65536, granularity); - } else { - granularity = 65536; - } - - return granularity; -} - -uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap) -{ - return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); -} - -void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) -{ - hbitmap_iter_init(hbi, bitmap->bitmap, 0); -} - -void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, - int64_t cur_sector, int nr_sectors) -{ - assert(bdrv_dirty_bitmap_enabled(bitmap)); - hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); -} - -void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, - int64_t cur_sector, int nr_sectors) -{ - assert(bdrv_dirty_bitmap_enabled(bitmap)); - hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); -} - -void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap) -{ - assert(bdrv_dirty_bitmap_enabled(bitmap)); - hbitmap_reset_all(bitmap->bitmap); -} - -void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, - int nr_sectors) -{ - BdrvDirtyBitmap *bitmap; - QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { - if (!bdrv_dirty_bitmap_enabled(bitmap)) { - continue; - } - hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); - } -} - -/** - * Advance an HBitmapIter to an arbitrary offset. - */ -void bdrv_set_dirty_iter(HBitmapIter *hbi, int64_t offset) -{ - assert(hbi->hb); - hbitmap_iter_init(hbi, hbi->hb, offset); -} - -int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap) -{ - return hbitmap_count(bitmap->bitmap); -} - /* Get a reference to bs */ void bdrv_ref(BlockDriverState *bs) { @@ -3630,9 +3389,9 @@ bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) if (!QLIST_EMPTY(&bs->op_blockers[op])) { blocker = QLIST_FIRST(&bs->op_blockers[op]); if (errp) { - error_setg(errp, "Node '%s' is busy: %s", - bdrv_get_device_or_node_name(bs), - error_get_pretty(blocker->reason)); + *errp = error_copy(blocker->reason); + error_prepend(errp, "Node '%s' is busy: ", + bdrv_get_device_or_node_name(bs)); } return true; } @@ -3689,46 +3448,6 @@ bool bdrv_op_blocker_is_empty(BlockDriverState *bs) return true; } -void bdrv_iostatus_enable(BlockDriverState *bs) -{ - bs->iostatus_enabled = true; - bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; -} - -/* The I/O status is only enabled if the drive explicitly - * enables it _and_ the VM is configured to stop on errors */ -bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) -{ - return (bs->iostatus_enabled && - (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || - bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || - bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); -} - -void bdrv_iostatus_disable(BlockDriverState *bs) -{ - bs->iostatus_enabled = false; -} - -void bdrv_iostatus_reset(BlockDriverState *bs) -{ - if (bdrv_iostatus_is_enabled(bs)) { - bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; - if (bs->job) { - block_job_iostatus_reset(bs->job); - } - } -} - -void bdrv_iostatus_set_err(BlockDriverState *bs, int error) -{ - assert(bdrv_iostatus_is_enabled(bs)); - if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { - bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : - BLOCK_DEVICE_IO_STATUS_FAILED; - } -} - void bdrv_img_create(const char *filename, const char *fmt, const char *base_filename, const char *base_fmt, char *options, uint64_t img_size, int flags, @@ -3739,7 +3458,6 @@ void bdrv_img_create(const char *filename, const char *fmt, const char *backing_fmt, *backing_file; int64_t size; BlockDriver *drv, *proto_drv; - BlockDriver *backing_drv = NULL; Error *local_err = NULL; int ret = 0; @@ -3813,14 +3531,6 @@ void bdrv_img_create(const char *filename, const char *fmt, } backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); - if (backing_fmt) { - backing_drv = bdrv_find_format(backing_fmt); - if (!backing_drv) { - error_setg(errp, "Unknown backing file format '%s'", - backing_fmt); - goto out; - } - } // The size for the image must always be specified, with one exception: // If we are using a backing file, we can obtain the size from there @@ -3831,6 +3541,7 @@ void bdrv_img_create(const char *filename, const char *fmt, char *full_backing = g_new0(char, PATH_MAX); int64_t size; int back_flags; + QDict *backing_options = NULL; bdrv_get_full_backing_filename_from_filename(filename, backing_file, full_backing, PATH_MAX, @@ -3841,12 +3552,18 @@ void bdrv_img_create(const char *filename, const char *fmt, } /* backing files always opened read-only */ - back_flags = - flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); + back_flags = flags; + back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); + + if (backing_fmt) { + backing_options = qdict_new(); + qdict_put(backing_options, "driver", + qstring_from_str(backing_fmt)); + } bs = NULL; - ret = bdrv_open(&bs, full_backing, NULL, NULL, back_flags, - backing_drv, &local_err); + ret = bdrv_open(&bs, full_backing, NULL, backing_options, + back_flags, &local_err); g_free(full_backing); if (ret < 0) { goto out; @@ -3869,7 +3586,7 @@ void bdrv_img_create(const char *filename, const char *fmt, } if (!quiet) { - printf("Formatting '%s', fmt=%s", filename, fmt); + printf("Formatting '%s', fmt=%s ", filename, fmt); qemu_opts_print(opts, " "); puts(""); } @@ -3915,17 +3632,17 @@ void bdrv_detach_aio_context(BlockDriverState *bs) baf->detach_aio_context(baf->opaque); } - if (bs->io_limits_enabled) { + if (bs->throttle_state) { throttle_timers_detach_aio_context(&bs->throttle_timers); } if (bs->drv->bdrv_detach_aio_context) { bs->drv->bdrv_detach_aio_context(bs); } if (bs->file) { - bdrv_detach_aio_context(bs->file); + bdrv_detach_aio_context(bs->file->bs); } - if (bs->backing_hd) { - bdrv_detach_aio_context(bs->backing_hd); + if (bs->backing) { + bdrv_detach_aio_context(bs->backing->bs); } bs->aio_context = NULL; @@ -3942,16 +3659,16 @@ void bdrv_attach_aio_context(BlockDriverState *bs, bs->aio_context = new_context; - if (bs->backing_hd) { - bdrv_attach_aio_context(bs->backing_hd, new_context); + if (bs->backing) { + bdrv_attach_aio_context(bs->backing->bs, new_context); } if (bs->file) { - bdrv_attach_aio_context(bs->file, new_context); + bdrv_attach_aio_context(bs->file->bs, new_context); } if (bs->drv->bdrv_attach_aio_context) { bs->drv->bdrv_attach_aio_context(bs, new_context); } - if (bs->io_limits_enabled) { + if (bs->throttle_state) { throttle_timers_attach_aio_context(&bs->throttle_timers, new_context); } @@ -4012,12 +3729,12 @@ void bdrv_remove_aio_context_notifier(BlockDriverState *bs, } int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, - BlockDriverAmendStatusCB *status_cb) + BlockDriverAmendStatusCB *status_cb, void *cb_opaque) { if (!bs->drv->bdrv_amend_options) { return -ENOTSUP; } - return bs->drv->bdrv_amend_options(bs, opts, status_cb); + return bs->drv->bdrv_amend_options(bs, opts, status_cb, cb_opaque); } /* This function will be called by the bdrv_recurse_is_first_non_filter method @@ -4059,10 +3776,10 @@ bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, */ bool bdrv_is_first_non_filter(BlockDriverState *candidate) { - BlockDriverState *bs; + BlockDriverState *bs = NULL; /* walk down the bs forest recursively */ - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { + while ((bs = bdrv_next(bs)) != NULL) { bool perm; /* try to recurse in this top level bs */ @@ -4077,7 +3794,8 @@ bool bdrv_is_first_non_filter(BlockDriverState *candidate) return false; } -BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) +BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, + const char *node_name, Error **errp) { BlockDriverState *to_replace_bs = bdrv_find_node(node_name); AioContext *aio_context; @@ -4100,7 +3818,7 @@ BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) * Another benefit is that this tests exclude backing files which are * blocked by the backing blockers. */ - if (!bdrv_is_first_non_filter(to_replace_bs)) { + if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { error_setg(errp, "Only top most non filter can be replaced"); to_replace_bs = NULL; goto out; @@ -4114,20 +3832,39 @@ out: static bool append_open_options(QDict *d, BlockDriverState *bs) { const QDictEntry *entry; + QemuOptDesc *desc; + BdrvChild *child; bool found_any = false; + const char *p; for (entry = qdict_first(bs->options); entry; entry = qdict_next(bs->options, entry)) { - /* Only take options for this level and exclude all non-driver-specific - * options */ - if (!strchr(qdict_entry_key(entry), '.') && - strcmp(qdict_entry_key(entry), "node-name")) - { - qobject_incref(qdict_entry_value(entry)); - qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); - found_any = true; + /* Exclude options for children */ + QLIST_FOREACH(child, &bs->children, next) { + if (strstart(qdict_entry_key(entry), child->name, &p) + && (!*p || *p == '.')) + { + break; + } } + if (child) { + continue; + } + + /* And exclude all non-driver-specific options */ + for (desc = bdrv_runtime_opts.desc; desc->name; desc++) { + if (!strcmp(qdict_entry_key(entry), desc->name)) { + break; + } + } + if (desc->name) { + continue; + } + + qobject_incref(qdict_entry_value(entry)); + qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); + found_any = true; } return found_any; @@ -4157,7 +3894,7 @@ void bdrv_refresh_filename(BlockDriverState *bs) /* This BDS's file name will most probably depend on its file's name, so * refresh that first */ if (bs->file) { - bdrv_refresh_filename(bs->file); + bdrv_refresh_filename(bs->file->bs); } if (drv->bdrv_refresh_filename) { @@ -4169,7 +3906,10 @@ void bdrv_refresh_filename(BlockDriverState *bs) bs->full_open_options = NULL; } - drv->bdrv_refresh_filename(bs); + opts = qdict_new(); + append_open_options(opts, bs); + drv->bdrv_refresh_filename(bs, opts); + QDECREF(opts); } else if (bs->file) { /* Try to reconstruct valid information from the underlying file */ bool has_open_options; @@ -4185,19 +3925,20 @@ void bdrv_refresh_filename(BlockDriverState *bs) /* If no specific options have been given for this BDS, the filename of * the underlying file should suffice for this one as well */ - if (bs->file->exact_filename[0] && !has_open_options) { - strcpy(bs->exact_filename, bs->file->exact_filename); + if (bs->file->bs->exact_filename[0] && !has_open_options) { + strcpy(bs->exact_filename, bs->file->bs->exact_filename); } /* Reconstructing the full options QDict is simple for most format block * drivers, as long as the full options are known for the underlying * file BDS. The full options QDict of that file BDS should somehow * contain a representation of the filename, therefore the following * suffices without querying the (exact_)filename of this BDS. */ - if (bs->file->full_open_options) { + if (bs->file->bs->full_open_options) { qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str(drv->format_name))); - QINCREF(bs->file->full_open_options); - qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options)); + QINCREF(bs->file->bs->full_open_options); + qdict_put_obj(opts, "file", + QOBJECT(bs->file->bs->full_open_options)); bs->full_open_options = opts; } else { @@ -4240,14 +3981,3 @@ void bdrv_refresh_filename(BlockDriverState *bs) QDECREF(json); } } - -/* This accessor function purpose is to allow the device models to access the - * BlockAcctStats structure embedded inside a BlockDriverState without being - * aware of the BlockDriverState structure layout. - * It will go away when the BlockAcctStats structure will be moved inside - * the device models. - */ -BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) -{ - return &bs->stats; -} |