diff options
| -rw-r--r-- | block.c | 74 | ||||
| -rw-r--r-- | block/blkdebug.c | 2 | ||||
| -rw-r--r-- | block/blkverify.c | 4 | ||||
| -rw-r--r-- | block/quorum.c | 4 | ||||
| -rw-r--r-- | block/vmdk.c | 5 | ||||
| -rw-r--r-- | include/block/block.h | 4 | ||||
| -rw-r--r-- | include/block/block_int.h | 7 |
7 files changed, 78 insertions, 22 deletions
diff --git a/block.c b/block.c index ad8b0c756f..3c04446f7f 100644 --- a/block.c +++ b/block.c @@ -79,6 +79,12 @@ static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = static QLIST_HEAD(, BlockDriver) bdrv_drivers = QLIST_HEAD_INITIALIZER(bdrv_drivers); +static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, + const char *reference, QDict *options, int flags, + BlockDriverState *parent, + const BdrvChildRole *child_role, + BlockDriver *drv, Error **errp); + static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs); /* If non-zero, use only whitelisted block drivers */ static int use_bdrv_whitelist; @@ -682,8 +688,8 @@ static int bdrv_temp_snapshot_flags(int flags) } /* - * Returns the flags that bs->file should get, based on the given flags for - * the parent BDS + * Returns the flags that bs->file should get if a protocol driver is expected, + * based on the given flags for the parent BDS */ static int bdrv_inherited_flags(int flags) { @@ -700,6 +706,25 @@ static int bdrv_inherited_flags(int flags) return flags; } +const BdrvChildRole child_file = { + .inherit_flags = bdrv_inherited_flags, +}; + +/* + * Returns the flags that bs->file should get if the use of formats (and not + * only protocols) is permitted for it, based on the given flags for the parent + * BDS + */ +static int bdrv_inherited_fmt_flags(int parent_flags) +{ + int flags = child_file.inherit_flags(parent_flags); + return flags & ~BDRV_O_PROTOCOL; +} + +const BdrvChildRole child_format = { + .inherit_flags = bdrv_inherited_fmt_flags, +}; + /* * Returns the flags that bs->backing_hd should get, based on the given flags * for the parent BDS @@ -715,6 +740,10 @@ static int bdrv_backing_flags(int flags) return flags; } +static const BdrvChildRole child_backing = { + .inherit_flags = bdrv_backing_flags, +}; + static int bdrv_open_flags(BlockDriverState *bs, int flags) { int open_flags = flags | BDRV_O_CACHE_WB; @@ -828,7 +857,6 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, goto fail_opts; } - bs->open_flags = flags; bs->guest_block_size = 512; bs->request_alignment = 512; bs->zero_beyond_eof = true; @@ -1158,9 +1186,10 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) } assert(bs->backing_hd == NULL); - ret = bdrv_open(&backing_hd, - *backing_filename ? backing_filename : NULL, NULL, options, - bdrv_backing_flags(bs->open_flags), NULL, &local_err); + ret = bdrv_open_inherit(&backing_hd, + *backing_filename ? backing_filename : NULL, + NULL, options, 0, bs, &child_backing, + NULL, &local_err); if (ret < 0) { bdrv_unref(backing_hd); backing_hd = NULL; @@ -1194,7 +1223,8 @@ free_exit: * To conform with the behavior of bdrv_open(), *pbs has to be NULL. */ int bdrv_open_image(BlockDriverState **pbs, const char *filename, - QDict *options, const char *bdref_key, int flags, + QDict *options, const char *bdref_key, + BlockDriverState* parent, const BdrvChildRole *child_role, bool allow_none, Error **errp) { QDict *image_options; @@ -1222,7 +1252,8 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename, goto done; } - ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); + ret = bdrv_open_inherit(pbs, filename, reference, image_options, 0, + parent, child_role, NULL, errp); done: qdict_del(options, bdref_key); @@ -1309,9 +1340,11 @@ out: * should be opened. If specified, neither options nor a filename may be given, * nor can an existing BDS be reused (that is, *pbs has to be NULL). */ -int bdrv_open(BlockDriverState **pbs, const char *filename, - const char *reference, QDict *options, int flags, - BlockDriver *drv, Error **errp) +static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, + const char *reference, QDict *options, int flags, + BlockDriverState *parent, + const BdrvChildRole *child_role, + BlockDriver *drv, Error **errp) { int ret; BlockDriverState *file = NULL, *bs; @@ -1320,6 +1353,8 @@ int bdrv_open(BlockDriverState **pbs, const char *filename, int snapshot_flags = 0; assert(pbs); + assert(!child_role || !flags); + assert(!child_role == !parent); if (reference) { bool options_non_empty = options ? qdict_size(options) : false; @@ -1357,6 +1392,10 @@ int bdrv_open(BlockDriverState **pbs, const char *filename, options = qdict_new(); } + if (child_role) { + flags = child_role->inherit_flags(parent->open_flags); + } + ret = bdrv_fill_options(&options, &filename, &flags, drv, &local_err); if (local_err) { goto fail; @@ -1377,6 +1416,7 @@ int bdrv_open(BlockDriverState **pbs, const char *filename, assert(drvname || !(flags & BDRV_O_PROTOCOL)); + bs->open_flags = flags; bs->options = options; options = qdict_clone_shallow(options); @@ -1391,9 +1431,9 @@ int bdrv_open(BlockDriverState **pbs, const char *filename, } assert(file == NULL); + bs->open_flags = flags; ret = bdrv_open_image(&file, filename, options, "file", - bdrv_inherited_flags(flags), - true, &local_err); + bs, &child_file, true, &local_err); if (ret < 0) { goto fail; } @@ -1516,6 +1556,14 @@ close_and_fail: return ret; } +int bdrv_open(BlockDriverState **pbs, const char *filename, + const char *reference, QDict *options, int flags, + BlockDriver *drv, Error **errp) +{ + return bdrv_open_inherit(pbs, filename, reference, options, flags, NULL, + NULL, drv, errp); +} + typedef struct BlockReopenQueueEntry { bool prepared; BDRVReopenState state; diff --git a/block/blkdebug.c b/block/blkdebug.c index 1e92607ef3..bc247f46f5 100644 --- a/block/blkdebug.c +++ b/block/blkdebug.c @@ -429,7 +429,7 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags, /* Open the backing file */ assert(bs->file == NULL); ret = bdrv_open_image(&bs->file, qemu_opt_get(opts, "x-image"), options, "image", - flags | BDRV_O_PROTOCOL, false, &local_err); + bs, &child_file, false, &local_err); if (ret < 0) { error_propagate(errp, local_err); goto out; diff --git a/block/blkverify.c b/block/blkverify.c index 438dff8bcb..d277e63220 100644 --- a/block/blkverify.c +++ b/block/blkverify.c @@ -125,7 +125,7 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags, /* Open the raw file */ assert(bs->file == NULL); ret = bdrv_open_image(&bs->file, qemu_opt_get(opts, "x-raw"), options, - "raw", flags | BDRV_O_PROTOCOL, false, &local_err); + "raw", bs, &child_file, false, &local_err); if (ret < 0) { error_propagate(errp, local_err); goto fail; @@ -134,7 +134,7 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags, /* Open the test file */ assert(s->test_file == NULL); ret = bdrv_open_image(&s->test_file, qemu_opt_get(opts, "x-image"), options, - "test", flags, false, &local_err); + "test", bs, &child_format, false, &local_err); if (ret < 0) { error_propagate(errp, local_err); s->test_file = NULL; diff --git a/block/quorum.c b/block/quorum.c index a33881a387..77e55b2775 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -935,8 +935,8 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, ret = snprintf(indexstr, 32, "children.%d", i); assert(ret < 32); - ret = bdrv_open_image(&s->bs[i], NULL, options, indexstr, flags, - false, &local_err); + ret = bdrv_open_image(&s->bs[i], NULL, options, indexstr, bs, + &child_format, false, &local_err); if (ret < 0) { goto close_exit; } diff --git a/block/vmdk.c b/block/vmdk.c index aad051b867..3284bec691 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -852,9 +852,8 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents); assert(ret < 32); - ret = bdrv_open_image(&extent_file, extent_path, - options, extent_opt_prefix, - bs->open_flags | BDRV_O_PROTOCOL, false, errp); + ret = bdrv_open_image(&extent_file, extent_path, options, + extent_opt_prefix, bs, &child_file, false, errp); g_free(extent_path); if (ret) { return ret; diff --git a/include/block/block.h b/include/block/block.h index 5f3c2de59c..45e23401f7 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -12,6 +12,7 @@ /* block.c */ typedef struct BlockDriver BlockDriver; typedef struct BlockJob BlockJob; +typedef struct BdrvChildRole BdrvChildRole; typedef struct BlockDriverInfo { /* in bytes, 0 if irrelevant */ @@ -203,7 +204,8 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); int bdrv_parse_cache_flags(const char *mode, int *flags); int bdrv_parse_discard_flags(const char *mode, int *flags); int bdrv_open_image(BlockDriverState **pbs, const char *filename, - QDict *options, const char *bdref_key, int flags, + QDict *options, const char *bdref_key, + BlockDriverState* parent, const BdrvChildRole *child_role, bool allow_none, Error **errp); void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp); diff --git a/include/block/block_int.h b/include/block/block_int.h index f004378d58..662dd56afe 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -330,6 +330,13 @@ typedef struct BdrvAioNotifier { QLIST_ENTRY(BdrvAioNotifier) list; } BdrvAioNotifier; +struct BdrvChildRole { + int (*inherit_flags)(int parent_flags); +}; + +extern const BdrvChildRole child_file; +extern const BdrvChildRole child_format; + /* * Note: the function bdrv_append() copies and swaps contents of * BlockDriverStates, so if you add new fields to this struct, please |