}
}
+/* Returns whether the image file is opened as read-only. Note that this can
+ * return false and writing to the image file is still not possible because the
+ * image is inactivated. */
+bool bdrv_is_read_only(BlockDriverState *bs)
+{
+ return bs->read_only;
+}
+
+/* Returns whether the image file can be written to right now */
+bool bdrv_is_writable(BlockDriverState *bs)
+{
+ return !bdrv_is_read_only(bs) && !(bs->open_flags & BDRV_O_INACTIVE);
+}
+
+int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, Error **errp)
+{
+ /* Do not set read_only if copy_on_read is enabled */
+ if (bs->copy_on_read && read_only) {
+ error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled",
+ bdrv_get_device_or_node_name(bs));
+ return -EINVAL;
+ }
+
+ /* Do not clear read_only if it is prohibited */
+ if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR)) {
+ error_setg(errp, "Node '%s' is read only",
+ bdrv_get_device_or_node_name(bs));
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp)
+{
+ int ret = 0;
+
+ ret = bdrv_can_set_read_only(bs, read_only, errp);
+ if (ret < 0) {
+ return ret;
+ }
+
+ bs->read_only = read_only;
+ return 0;
+}
+
void bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
char *dest, size_t sz,
bdrv_drained_end(bs);
}
+static int bdrv_child_cb_inactivate(BdrvChild *child)
+{
+ BlockDriverState *bs = child->opaque;
+ assert(bs->open_flags & BDRV_O_INACTIVE);
+ return 0;
+}
+
/*
* Returns the options and flags that a temporary snapshot should get, based on
* the originally requested flags (the originally requested image will have
* 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);
+ qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE);
/* Inherit the read-only option from the parent if it's not set */
qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY);
.inherit_options = bdrv_inherited_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
/*
.inherit_options = bdrv_inherited_fmt_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
static void bdrv_backing_attach(BdrvChild *c)
* 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);
+ qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE);
/* backing files always opened read-only */
qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on");
.inherit_options = bdrv_backing_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
static int bdrv_open_flags(BlockDriverState *bs, int flags)
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));
+ qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, 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));
+ qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH,
+ flags & BDRV_O_NO_FLUSH);
}
if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) {
- qdict_put(options, BDRV_OPT_READ_ONLY,
- qbool_from_bool(!(flags & BDRV_O_RDWR)));
+ qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR));
}
}
.type = QEMU_OPT_STRING,
.help = "discard operation (ignore/off, unmap/on)",
},
+ {
+ .name = BDRV_OPT_FORCE_SHARE,
+ .type = QEMU_OPT_BOOL,
+ .help = "always accept other writers (default: off)",
+ },
{ /* end of list */ }
},
};
drv = bdrv_find_format(driver_name);
assert(drv != NULL);
+ bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false);
+
+ if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) {
+ error_setg(errp,
+ BDRV_OPT_FORCE_SHARE
+ "=on can only be used with read-only images");
+ ret = -EINVAL;
+ goto fail_opts;
+ }
+
if (file != NULL) {
filename = blk_bs(file)->filename;
} else {
filename = qdict_get_try_str(options, "filename");
}
- if (drv->bdrv_needs_filename && !filename) {
+ if (drv->bdrv_needs_filename && (!filename || !filename[0])) {
error_setg(errp, "The '%s' block driver requires a file name",
drv->format_name);
ret = -EINVAL;
/* Fetch the file name from the options QDict if necessary */
if (protocol && filename) {
if (!qdict_haskey(*options, "filename")) {
- qdict_put(*options, "filename", qstring_from_str(filename));
+ qdict_put_str(*options, "filename", filename);
parse_filename = true;
} else {
error_setg(errp, "Can't specify 'file' and 'filename' options at "
}
drvname = drv->format_name;
- qdict_put(*options, "driver", qstring_from_str(drvname));
+ qdict_put_str(*options, "driver", drvname);
} else {
error_setg(errp, "Must specify either driver or file");
return -EINVAL;
static void bdrv_child_abort_perm_update(BdrvChild *c);
static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared);
+static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
+ BdrvChild *c,
+ const BdrvChildRole *role,
+ uint64_t parent_perm, uint64_t parent_shared,
+ uint64_t *nperm, uint64_t *nshared)
+{
+ if (bs->drv && bs->drv->bdrv_child_perm) {
+ bs->drv->bdrv_child_perm(bs, c, role,
+ parent_perm, parent_shared,
+ nperm, nshared);
+ }
+ if (child_bs && child_bs->force_share) {
+ *nshared = BLK_PERM_ALL;
+ }
+}
+
/*
* Check whether permissions on this node can be changed in a way that
* @cumulative_perms and @cumulative_shared_perms are the new cumulative
/* Write permissions never work with read-only images */
if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) &&
- bdrv_is_read_only(bs))
+ !bdrv_is_writable(bs))
{
error_setg(errp, "Block node is read-only");
return -EPERM;
/* Check all children */
QLIST_FOREACH(c, &bs->children, next) {
uint64_t cur_perm, cur_shared;
- drv->bdrv_child_perm(bs, c, c->role,
- cumulative_perms, cumulative_shared_perms,
- &cur_perm, &cur_shared);
+ bdrv_child_perm(bs, c->bs, c, c->role,
+ cumulative_perms, cumulative_shared_perms,
+ &cur_perm, &cur_shared);
ret = bdrv_child_check_perm(c, cur_perm, cur_shared, ignore_children,
errp);
if (ret < 0) {
/* Update all children */
QLIST_FOREACH(c, &bs->children, next) {
uint64_t cur_perm, cur_shared;
- drv->bdrv_child_perm(bs, c, c->role,
- cumulative_perms, cumulative_shared_perms,
- &cur_perm, &cur_shared);
+ bdrv_child_perm(bs, c->bs, c, c->role,
+ cumulative_perms, cumulative_shared_perms,
+ &cur_perm, &cur_shared);
bdrv_child_set_perm(c, cur_perm, cur_shared);
}
}
return g_strdup("another user");
}
-static char *bdrv_perm_names(uint64_t perm)
+char *bdrv_perm_names(uint64_t perm)
{
struct perm_name {
uint64_t perm;
bdrv_filter_default_perms(bs, c, role, perm, shared, &perm, &shared);
/* Format drivers may touch metadata even if the guest doesn't write */
- if (!bdrv_is_read_only(bs)) {
+ if (bdrv_is_writable(bs)) {
perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
}
BLK_PERM_WRITE_UNCHANGED;
}
+ if (bs->open_flags & BDRV_O_INACTIVE) {
+ shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
+ }
+
*nperm = perm;
*nshared = shared;
}
assert(parent_bs->drv);
assert(bdrv_get_aio_context(parent_bs) == bdrv_get_aio_context(child_bs));
- parent_bs->drv->bdrv_child_perm(parent_bs, NULL, child_role,
- perm, shared_perm, &perm, &shared_perm);
+ bdrv_child_perm(parent_bs, child_bs, NULL, child_role,
+ perm, shared_perm, &perm, &shared_perm);
child = bdrv_root_attach_child(child_bs, child_name, child_role,
perm, shared_perm, parent_bs, errp);
}
if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) {
- qdict_put(options, "driver", qstring_from_str(bs->backing_format));
+ qdict_put_str(options, "driver", bs->backing_format);
}
backing_hd = bdrv_open_inherit(*backing_filename ? backing_filename : NULL,
char *tmp_filename = g_malloc0(PATH_MAX + 1);
int64_t total_size;
QemuOpts *opts = NULL;
- BlockDriverState *bs_snapshot;
+ BlockDriverState *bs_snapshot = NULL;
Error *local_err = NULL;
int ret;
}
/* 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"));
+ qdict_put_str(snapshot_options, "file.driver", "file");
+ qdict_put_str(snapshot_options, "file.filename", tmp_filename);
+ qdict_put_str(snapshot_options, "driver", "qcow2");
bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp);
snapshot_options = NULL;
if (!bs_snapshot) {
- ret = -EINVAL;
goto out;
}
- /* bdrv_append() consumes a strong reference to bs_snapshot (i.e. it will
- * call bdrv_unref() on it), so in order to be able to return one, we have
- * to increase bs_snapshot's refcount here */
+ /* bdrv_append() consumes a strong reference to bs_snapshot
+ * (i.e. it will call bdrv_unref() on it) even on error, so in
+ * order to be able to return one, we have to increase
+ * bs_snapshot's refcount here */
bdrv_ref(bs_snapshot);
bdrv_append(bs_snapshot, bs, &local_err);
if (local_err) {
error_propagate(errp, local_err);
- ret = -EINVAL;
+ bs_snapshot = NULL;
goto out;
}
- g_free(tmp_filename);
- return bs_snapshot;
-
out:
QDECREF(snapshot_options);
g_free(tmp_filename);
- return NULL;
+ return bs_snapshot;
}
/*
goto fail;
}
- qdict_put(options, "file",
- qstring_from_str(bdrv_get_node_name(file_bs)));
+ qdict_put_str(options, "file", bdrv_get_node_name(file_bs));
}
}
* 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));
+ qdict_put_str(bs->options, "driver", drv->format_name);
+ qdict_put_str(options, "driver", drv->format_name);
} else if (!drv) {
error_setg(errp, "Must specify either driver or file");
goto fail;
BlockDriver *drv;
QemuOpts *opts;
const char *value;
+ bool read_only;
assert(reopen_state != NULL);
assert(reopen_state->bs->drv != NULL);
* 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));
+ qdict_put_str(reopen_state->options, "node-name", value);
}
value = qemu_opt_get(opts, "driver");
if (value) {
- qdict_put(reopen_state->options, "driver", qstring_from_str(value));
+ qdict_put_str(reopen_state->options, "driver", 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) &&
- reopen_state->flags & BDRV_O_RDWR) {
- error_setg(errp, "Node '%s' is read only",
- bdrv_get_device_or_node_name(reopen_state->bs));
+ /* If we are to stay read-only, do not allow permission change
+ * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is
+ * not set, or if the BDS still has copy_on_read enabled */
+ read_only = !(reopen_state->flags & BDRV_O_RDWR);
+ ret = bdrv_can_set_read_only(reopen_state->bs, read_only, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
goto error;
}
/**
* Truncate file to 'offset' bytes (needed only for file protocols)
*/
-int bdrv_truncate(BdrvChild *child, int64_t offset)
+int bdrv_truncate(BdrvChild *child, int64_t offset, Error **errp)
{
BlockDriverState *bs = child->bs;
BlockDriver *drv = bs->drv;
int ret;
- /* FIXME: Some format block drivers use this function instead of implicitly
- * growing their file by writing beyond its end.
- * See bdrv_aligned_pwritev() for an explanation why we currently
- * cannot assert this permission in that case. */
- // assert(child->perm & BLK_PERM_RESIZE);
+ assert(child->perm & BLK_PERM_RESIZE);
- if (!drv)
+ if (!drv) {
+ error_setg(errp, "No medium inserted");
return -ENOMEDIUM;
- if (!drv->bdrv_truncate)
+ }
+ if (!drv->bdrv_truncate) {
+ error_setg(errp, "Image format driver does not support resize");
return -ENOTSUP;
- if (bs->read_only)
+ }
+ if (bs->read_only) {
+ error_setg(errp, "Image is read-only");
return -EACCES;
+ }
- ret = drv->bdrv_truncate(bs, offset);
+ assert(!(bs->open_flags & BDRV_O_INACTIVE));
+
+ ret = drv->bdrv_truncate(bs, offset, errp);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
bdrv_dirty_bitmap_truncate(bs);
*nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors;
}
-bool bdrv_is_read_only(BlockDriverState *bs)
-{
- return bs->read_only;
-}
-
bool bdrv_is_sg(BlockDriverState *bs)
{
return bs->sg;
void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp)
{
- BdrvChild *child;
+ BdrvChild *child, *parent;
+ uint64_t perm, shared_perm;
Error *local_err = NULL;
int ret;
error_setg_errno(errp, -ret, "Could not refresh total sector count");
return;
}
+
+ /* Update permissions, they may differ for inactive nodes */
+ bdrv_get_cumulative_perm(bs, &perm, &shared_perm);
+ ret = bdrv_check_perm(bs, perm, shared_perm, NULL, &local_err);
+ if (ret < 0) {
+ bs->open_flags |= BDRV_O_INACTIVE;
+ error_propagate(errp, local_err);
+ return;
+ }
+ bdrv_set_perm(bs, perm, shared_perm);
+
+ QLIST_FOREACH(parent, &bs->parents, next_parent) {
+ if (parent->role->activate) {
+ parent->role->activate(parent, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ }
+ }
}
void bdrv_invalidate_cache_all(Error **errp)
static int bdrv_inactivate_recurse(BlockDriverState *bs,
bool setting_flag)
{
- BdrvChild *child;
+ BdrvChild *child, *parent;
int ret;
if (!setting_flag && bs->drv->bdrv_inactivate) {
}
}
+ if (setting_flag) {
+ uint64_t perm, shared_perm;
+
+ bs->open_flags |= BDRV_O_INACTIVE;
+
+ QLIST_FOREACH(parent, &bs->parents, next_parent) {
+ if (parent->role->inactivate) {
+ ret = parent->role->inactivate(parent);
+ if (ret < 0) {
+ bs->open_flags &= ~BDRV_O_INACTIVE;
+ return ret;
+ }
+ }
+ }
+
+ /* Update permissions, they may differ for inactive nodes */
+ bdrv_get_cumulative_perm(bs, &perm, &shared_perm);
+ bdrv_check_perm(bs, perm, shared_perm, NULL, &error_abort);
+ bdrv_set_perm(bs, perm, shared_perm);
+ }
+
QLIST_FOREACH(child, &bs->children, next) {
ret = bdrv_inactivate_recurse(child->bs, setting_flag);
if (ret < 0) {
}
}
- if (setting_flag) {
- bs->open_flags |= BDRV_O_INACTIVE;
- }
return 0;
}
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,
- Error **errp, bool quiet)
+ char *options, uint64_t img_size, int flags, bool quiet,
+ Error **errp)
{
QemuOptsList *create_opts = NULL;
QemuOpts *opts = NULL;
if (backing_fmt) {
backing_options = qdict_new();
- qdict_put(backing_options, "driver",
- qstring_from_str(backing_fmt));
+ qdict_put_str(backing_options, "driver", backing_fmt);
}
bs = bdrv_open(full_backing, NULL, backing_options, back_flags,
* contain a representation of the filename, therefore the following
* suffices without querying the (exact_)filename of this BDS. */
if (bs->file->bs->full_open_options) {
- qdict_put_obj(opts, "driver",
- QOBJECT(qstring_from_str(drv->format_name)));
+ qdict_put_str(opts, "driver", drv->format_name);
QINCREF(bs->file->bs->full_open_options);
- qdict_put_obj(opts, "file",
- QOBJECT(bs->file->bs->full_open_options));
+ qdict_put(opts, "file", bs->file->bs->full_open_options);
bs->full_open_options = opts;
} else {
opts = qdict_new();
append_open_options(opts, bs);
- qdict_put_obj(opts, "driver",
- QOBJECT(qstring_from_str(drv->format_name)));
+ qdict_put_str(opts, "driver", drv->format_name);
if (bs->exact_filename[0]) {
/* This may not work for all block protocol drivers (some may
* needs some special format of the options QDict, it needs to
* implement the driver-specific bdrv_refresh_filename() function.
*/
- qdict_put_obj(opts, "filename",
- QOBJECT(qstring_from_str(bs->exact_filename)));
+ qdict_put_str(opts, "filename", bs->exact_filename);
}
bs->full_open_options = opts;
projects / mirror_qemu.git / blobdiff