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Edit File: lvd-map.h
#ifndef _LVD_MAP_H_ #define _LVD_MAP_H_ #include <stdint.h> #include <sys/types.h> /* * LVD per-domain registry — single C implementation for liblve.so. * * Two file types live under LVD_MAP_DIR: * * <uid> Per-uid open-addressing hash table (docroot -> domain_id). * The hot lookup path touches only this file — no locking, * no .index access. * * .index Global next_id counter (12 bytes). Touched only on writes * (assign/remove), under flock(). * * Per-uid on-disk format (version 2): * * Header (16 bytes): * magic[4] = "LVDM" * version(u16) = 2 * count(u16) — number of occupied slots * str_offset(u32)— byte offset from file start to string pool * capacity(u32) — hash table slot count (power of 2) * * Hash table (capacity * 16 bytes, starts at byte 16): * Per slot (16 bytes): * hash(u32) — FNV-1a of docroot; 0 = empty slot * key_offset(u32)— offset into string pool (from pool start) * key_len(u32) — docroot string length (excluding NUL) * domain_id(u32) — assigned domain LVE ID * * String pool (at str_offset): * Packed null-terminated docroot strings * * Version 1 (legacy sorted-array format) is still accepted by * lvd_map_lookup() for transparent migration. */ #define LVD_MAP_MAGIC "LVDM" #define LVD_MAP_VERSION 2 #define LVD_MAP_DIR "/etc/container/lvd_ids" /* Legacy format version for backward-compatible reads */ #define LVD_MAP_VERSION_V1 1 struct lvd_map_header { char magic[4]; uint16_t version; uint16_t count; uint32_t str_offset; uint32_t capacity; /* v2: hash table slot count; v1: reserved */ } __attribute__((packed)); struct lvd_map_slot { uint32_t hash; /* FNV-1a of docroot; 0 = empty */ uint32_t key_offset; /* offset into string pool */ uint32_t key_len; /* docroot length (no NUL) */ uint32_t domain_id; } __attribute__((packed)); /* Legacy v1 entry (12 bytes, sorted by docroot) */ struct lvd_map_entry_v1 { uint32_t key_offset; uint32_t key_len; uint32_t domain_id; } __attribute__((packed)); /* ------------------------------------------------------------------ */ /* Hash */ /* ------------------------------------------------------------------ */ uint32_t lvd_fnv1a(const char *docroot); /* ------------------------------------------------------------------ */ /* Read-only (no locking, no .index access) */ /* ------------------------------------------------------------------ */ uint32_t lvd_map_lookup(uid_t uid, const char *docroot); int lvd_map_verify_ownership(uid_t uid, uint32_t domain_id); /* ------------------------------------------------------------------ */ /* Iteration (opendir/readdir style — zero-copy, mmap-backed) */ /* ------------------------------------------------------------------ */ typedef struct lvd_iter lvd_iter_t; lvd_iter_t *lvd_map_iter_open(uid_t uid); int lvd_map_iter_next(lvd_iter_t *it, const char **docroot, uint32_t *domain_id); void lvd_map_iter_close(lvd_iter_t *it); /* ------------------------------------------------------------------ */ /* Read-write (acquires flock on .index) */ /* ------------------------------------------------------------------ */ int lvd_map_assign(uid_t uid, const char *docroot, uint32_t *out_id); int lvd_map_remove(uid_t uid, const char *docroot, uint32_t *old_id); int lvd_map_remove_all(uid_t uid); /* ------------------------------------------------------------------ */ /* Index management */ /* ------------------------------------------------------------------ */ int lvd_index_rebuild(void); /* ------------------------------------------------------------------ */ /* Domain ID threshold */ /* ------------------------------------------------------------------ */ /* * Minimum domain LVE ID — reads UID_MAX from /etc/login.defs at runtime. * Returns max(UID_MAX, LVD_UID_MAX_DEFAULT) so domain IDs never go * below the compile-time floor (60000). */ uint32_t lvd_get_id_min(void); #endif /* _LVD_MAP_H_ */
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