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/usr/include/dovecot/quota.h is in dovecot-dev 1:2.2.9-1ubuntu2.

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#ifndef QUOTA_H
#define QUOTA_H

struct mail;
struct mailbox;
struct mail_user;

/* Message storage size kilobytes. */
#define QUOTA_NAME_STORAGE_KILOBYTES "STORAGE"
/* Message storage size bytes. This is used only internally. */
#define QUOTA_NAME_STORAGE_BYTES "STORAGE_BYTES"
/* Number of messages. */
#define QUOTA_NAME_MESSAGES "MESSAGE"

struct quota;
struct quota_settings;
struct quota_root_settings;
struct quota_root;
struct quota_root_iter;
struct quota_transaction_context;

int quota_user_read_settings(struct mail_user *user,
			     struct quota_settings **set_r,
			     const char **error_r);
void quota_settings_deinit(struct quota_settings **quota_set);

/* Add a new rule too the quota root. Returns 0 if ok, -1 if rule is invalid. */
int quota_root_add_rule(struct quota_root_settings *root_set,
			const char *rule_def, const char **error_r);
/* Add a new warning rule for the quota root. Returns 0 if ok, -1 if rule is
   invalid. */
int quota_root_add_warning_rule(struct quota_root_settings *root_set,
				const char *rule_def, const char **error_r);

/* Initialize quota for the given user. */
int quota_init(struct quota_settings *quota_set, struct mail_user *user,
	       struct quota **quota_r, const char **error_r);
void quota_deinit(struct quota **quota);

/* List all quota roots. Returned quota roots are freed by quota_deinit(). */
struct quota_root_iter *quota_root_iter_init(struct mailbox *box);
struct quota_root *quota_root_iter_next(struct quota_root_iter *iter);
void quota_root_iter_deinit(struct quota_root_iter **iter);

/* Return quota root or NULL. */
struct quota_root *quota_root_lookup(struct mail_user *user, const char *name);

/* Returns name of the quota root. */
const char *quota_root_get_name(struct quota_root *root);
/* Return a list of all resources set for the quota root. */
const char *const *quota_root_get_resources(struct quota_root *root);

/* Returns 1 if quota value was found, 0 if not, -1 if error. */
int quota_get_resource(struct quota_root *root, const char *mailbox_name,
		       const char *name, uint64_t *value_r, uint64_t *limit_r);
/* Returns 0 if OK, -1 if error (eg. permission denied, invalid name). */
int quota_set_resource(struct quota_root *root, const char *name,
		       uint64_t value, const char **error_r);

/* Start a new quota transaction. */
struct quota_transaction_context *quota_transaction_begin(struct mailbox *box);
/* Commit quota transaction. Returns 0 if ok, -1 if failed. */
int quota_transaction_commit(struct quota_transaction_context **ctx);
/* Rollback quota transaction changes. */
void quota_transaction_rollback(struct quota_transaction_context **ctx);

/* Allocate from quota if there's space. Returns 1 if updated, 0 if not,
   -1 if error. If mail size is larger than even maximum allowed quota,
   too_large_r is set to TRUE. */
int quota_try_alloc(struct quota_transaction_context *ctx,
		    struct mail *mail, bool *too_large_r);
/* Like quota_try_alloc(), but don't actually allocate anything. */
int quota_test_alloc(struct quota_transaction_context *ctx,
		     uoff_t size, bool *too_large_r);
/* Update quota by allocating/freeing space used by mail. */
void quota_alloc(struct quota_transaction_context *ctx, struct mail *mail);
void quota_free(struct quota_transaction_context *ctx, struct mail *mail);
void quota_free_bytes(struct quota_transaction_context *ctx,
		      uoff_t physical_size);
/* Mark the quota to be recalculated */
void quota_recalculate(struct quota_transaction_context *ctx);

#endif