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dm table: add always writeable feature
Add a target feature flag DM_TARGET_ALWAYS_WRITEABLE to indicate that a target does not support read-only mode. The initial implementation of the thin provisioning target uses this. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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2 changed files with 13 additions and 0 deletions
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@ -774,6 +774,12 @@ int dm_table_add_target(struct dm_table *t, const char *type,
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t->singleton = 1;
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}
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if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
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DMERR("%s: target type %s may not be included in read-only tables",
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dm_device_name(t->md), type);
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return -EINVAL;
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}
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tgt->table = t;
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tgt->begin = start;
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tgt->len = len;
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@ -166,6 +166,13 @@ struct target_type {
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#define DM_TARGET_SINGLETON 0x00000001
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#define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON)
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/*
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* Indicates that a target does not support read-only devices.
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*/
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#define DM_TARGET_ALWAYS_WRITEABLE 0x00000002
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#define dm_target_always_writeable(type) \
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((type)->features & DM_TARGET_ALWAYS_WRITEABLE)
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struct dm_target {
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struct dm_table *table;
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struct target_type *type;
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