1

#ifndef DBFS_DBFS_H

     2

#define DBFS_DBFS_H

     3

     4

#include <sys/stat.h>

     5

#include <errno.h>

     6

     7

#include <event2/event.h>

     8

     9

#include "ops.h"

    10

#include "../evfuse.h"

    11

#include "../evsql.h"

    12

    13

/*

    14

 * Structs and functions shared between all dbfs components

    15

 */

    16

    17

struct dbfs {

    18

    struct event_base *ev_base;

    19

    20

    const char *db_conninfo;

    21

    struct evsql *db;

    22

    23

    struct evfuse *ev_fuse;

    24

};

    25

    26

// used for error returns

    27

typedef int err_t;

    28

    29

// XXX: not sure how this should work

    30

#define CACHE_TIMEOUT 1.0

    31

    32

// columns used for stat_info

    33

#define DBFS_STAT_COLS " inodes.type, inodes.mode, dbfs_size(inodes.type, inodes.data, inodes.link_path), (SELECT COUNT(*) FROM inodes i LEFT JOIN file_tree ft ON (i.ino = ft.ino) WHERE i.ino = inodes.ino) AS nlink"

    34

    35

/*

    36

 * Convert the CHAR(4) inodes.type from SQL into a mode_t.

    37

 *

    38

 * Returns zero for unknown types.

    39

 */

    40

mode_t _dbfs_mode (const char *type);

    41

    42

/*

    43

 * Check that the number of rows and columns in the result set matches what we expect.

    44

 *

    45

 * If rows is nonzero, there must be exactly that many rows (mostly useful for rows=1).

    46

 * The number of columns must always be given, and match.

    47

 *

    48

 * Returns;

    49

 *  -1  if the query failed, the columns/rows do not match

    50

 *  0   the results match

    51

 *  1   there were no results (zero rows)

    52

 */

    53

int _dbfs_check_res (const struct evsql_result_info *res, size_t rows, size_t cols);

    54

    55

/*

    56

 * Same as _dbfs_check_res, but returns ENOENT/EIO directly

    57

 */

    58

err_t dbfs_check_result (const struct evsql_result_info *res, size_t rows, size_t cols);

    59

    60

/*

    61

 * Fill a `struct state` with info retrieved from a SQL query.

    62

 *

    63

 * The result must contain four columns, starting at the given offset:

    64

 *  inodes.type, inodes.mode, inodes.size, count(*) AS nlink

    65

 *

    66

 * Note that this does not fill the st_ino field

    67

 */

    68

int _dbfs_stat_info (struct stat *st, const struct evsql_result_info *res, size_t row, size_t col_offset);

    69

    70

#endif /* DBFS_DBFS_H */