/*
 *
 *	Header of IO operations for quota utilities
 *
 */

#ifndef GUARD_QUOTAIO_H
#define GUARD_QUOTAIO_H

#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>

#include "quota.h"
#include "mntopt.h"
#include "dqblk_v1.h"
#include "dqblk_v2.h"
#include "dqblk_rpc.h"
#include "dqblk_xfs.h"

#define QUOTAFORMATS 6

#define INITQFBASENAMES {\
	"quota",\
	"aquota",\
	"aquota",\
	"",\
	"",\
	"",\
}

#define MAX_FSTYPE_LEN 16		/* Maximum length of filesystem type name */

/* Values for format handling */
#define QF_ERROR -1		/* There was error while detecting format (maybe unknown format...) */
#define QF_VFSOLD 0		/* Old quota format */
#define QF_VFSV0 1		/* Quota files with tree quota format */
#define QF_VFSV1 2		/* Quota files with 64-bit tree quota format */
#define QF_RPC 3		/* RPC should be used on given filesystem */
#define QF_XFS 4		/* XFS quota format */
#define QF_META 5		/* Quota files are hidden, we don't care about the format */
#define QF_VFSUNKNOWN 6		/* Some VFS quotas, we didn't detect particular format yet */

static inline int is_tree_qfmt(int fmt)
{
	return fmt == QF_VFSV0 || fmt == QF_VFSV1;
}

/*
 * Definitions for disk quotas imposed on the average user
 * (big brother finally hits Linux).
 *
 * The following constants define the default amount of time given a user
 * before the soft limits are treated as hard limits (usually resulting
 * in an allocation failure). The timer is started when the user crosses
 * their soft limit, it is reset when they go below their soft limit.
 */
#define MAX_IQ_TIME  604800	/* (7*24*60*60) 1 week */
#define MAX_DQ_TIME  604800	/* (7*24*60*60) 1 week */

#define IOFL_QUOTAON	0x01	/* Is quota enabled in kernel? */
#define IOFL_INFODIRTY	0x02	/* Did info change? */
#define IOFL_RO		0x04	/* Just RO access? */
#define IOFL_NFS_MIXED_PATHS	0x08	/* Should we trim leading slashes
					   from NFSv4 mountpoints? */

struct quotafile_ops;

/* Generic information about quotafile */
struct util_dqinfo {
	time_t dqi_bgrace;	/* Block grace time for given quotafile */
	time_t dqi_igrace;	/* Inode grace time for given quotafile */
	uint64_t dqi_max_b_limit;	/* Maximal block limit storable in current format */
	uint64_t dqi_max_i_limit;	/* Maximal inode limit storable in current format */
	uint64_t dqi_max_b_usage;	/* Maximal block usage storable in current format */
	uint64_t dqi_max_i_usage;	/* Maximal inode usage storable in current format */
	union {
		struct v2_mem_dqinfo v2_mdqi;
		struct xfs_mem_dqinfo xfs_mdqi;
	} u;			/* Format specific info about quotafile */
};

/* Structure for one opened quota file */
struct quota_handle {
	int qh_fd;		/* Handle of file (-1 when IOFL_QUOTAON) */
	int qh_io_flags;	/* IO flags for file */
	char qh_quotadev[PATH_MAX];	/* Device file is for */
	char qh_dir[PATH_MAX];		/* Directory filesystem is mounted at */
	char qh_fstype[MAX_FSTYPE_LEN];	/* Type of the filesystem on qh_quotadev */
	int qh_type;		/* Type of quotafile */
	int qh_fmt;		/* Quotafile format */
	struct stat qh_stat;	/* stat(2) for qh_quotadev */
	struct quotafile_ops *qh_ops;	/* Operations on quotafile */
	struct util_dqinfo qh_info;	/* Generic quotafile info */
};

/* Statistics gathered from kernel */
struct util_dqstats {
	u_int32_t lookups;
	u_int32_t drops;
	u_int32_t reads;
	u_int32_t writes;
	u_int32_t cache_hits;
	u_int32_t allocated_dquots;
	u_int32_t free_dquots;
	u_int32_t syncs;
	u_int32_t version;
};

/* Utility quota block */
struct util_dqblk {
	qsize_t dqb_ihardlimit;
	qsize_t dqb_isoftlimit;
	qsize_t dqb_curinodes;
	qsize_t dqb_bhardlimit;
	qsize_t dqb_bsoftlimit;
	qsize_t dqb_curspace;
	time_t dqb_btime;
	time_t dqb_itime;
	union {
		struct v2_mem_dqblk v2_mdqb;
	} u;			/* Format specific dquot information */
};

#define DQ_FOUND 0x01		/* Dquot was found in the edquotas file */
#define DQ_PRINTED 0x02		/* Dquota has been already printed by repquota */

/* Structure for one loaded quota */
struct dquot {
	struct dquot *dq_next;	/* Pointer to next dquot in the list */
	qid_t dq_id;		/* ID dquot belongs to */
	int dq_flags;		/* Some flags for utils */
	struct quota_handle *dq_h;	/* Handle of quotafile dquot belongs to */
	struct util_dqblk dq_dqb;	/* Parsed data of dquot */
};

/* Flags for commit function (have effect only when quota in kernel is turned on) */
#define COMMIT_USAGE QIF_USAGE
#define COMMIT_LIMITS QIF_LIMITS
#define COMMIT_TIMES QIF_TIMES
#define COMMIT_ALL (COMMIT_USAGE | COMMIT_LIMITS | COMMIT_TIMES)

/* Structure of quotafile operations */
struct quotafile_ops {
	int (*check_file) (int fd, int type, int fmt);	/* Check whether quotafile is in our format */
	int (*init_io) (struct quota_handle * h);	/* Open quotafile */
	int (*new_io) (struct quota_handle * h);	/* Create new quotafile */
	int (*end_io) (struct quota_handle * h);	/* Write all changes and close quotafile */
	int (*write_info) (struct quota_handle * h);	/* Write info about quotafile */
	struct dquot *(*read_dquot) (struct quota_handle * h, qid_t id);	/* Read dquot into memory */
	int (*commit_dquot) (struct dquot * dquot, int flag);	/* Write given dquot to disk */
	int (*scan_dquots) (struct quota_handle * h, int (*process_dquot) (struct dquot * dquot, char * dqname));	/* Scan quotafile and call callback on every structure */
	int (*report) (struct quota_handle * h, int verbose);	/* Function called after 'repquota' to print format specific file information */
};

/* This might go into a special header file but that sounds a bit silly... */
extern struct quotafile_ops quotafile_ops_meta;

static inline void mark_quotafile_info_dirty(struct quota_handle *h)
{
	h->qh_io_flags |= IOFL_INFODIRTY;
}

#define QIO_ENABLED(h)	((h)->qh_io_flags & IOFL_QUOTAON)
#define QIO_RO(h)	((h)->qh_io_flags & IOFL_RO)

struct mount_entry;

/* Check quota format used on specified medium and initialize it */
struct quota_handle *init_io(struct mount_entry *mnt, int type, int fmt, int flags);

/* Create new quotafile of specified format on given filesystem */
struct quota_handle *new_io(struct mount_entry *mnt, int type, int fmt);

/* Close quotafile */
int end_io(struct quota_handle *h);

/* Get empty quota structure */
struct dquot *get_empty_dquot(void);

/* Check whether values in current dquot can be stored on disk */
int check_dquot_range(struct dquot *dquot);

#endif /* GUARD_QUOTAIO_H */