Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib-index/mail-index-private.h @ 2941:89ab5c72430d HEAD
lock_method=dotlock doesn't crash anymore while trying to modify cache file.
We didn't previously deal with any fatal errors that fcntl/flock locking
could have given but assumed that the locking succeeded.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Sun, 05 Dec 2004 06:10:43 +0200 |
parents | 57f975a9b63b |
children | 61c8d205d887 |
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#ifndef __MAIL_INDEX_PRIVATE_H #define __MAIL_INDEX_PRIVATE_H /* Make sure F_RDLCK, F_WRLCK and F_UNLCK get defined */ #include <unistd.h> #include <fcntl.h> #include "file-dotlock.h" #include "mail-index.h" struct mail_transaction_header; struct mail_index_sync_map_ctx; /* How many seconds to wait a lock for index file. */ #define MAIL_INDEX_LOCK_SECS 120 /* Index file is grown exponentially when we're adding less than this many records. */ #define MAIL_INDEX_MAX_POWER_GROW (1024*1024 / sizeof(struct mail_index_record)) /* How many times to retry opening index files if read/fstat returns ESTALE. This happens with NFS when the file has been deleted (ie. index file was rewritten by another computer than us). */ #define MAIL_INDEX_ESTALE_RETRY_COUNT 10 #define MAIL_INDEX_MAP_IS_IN_MEMORY(map) \ ((map)->buffer != NULL) #define MAIL_INDEX_MAP_IDX(map, idx) \ ((struct mail_index_record *) \ PTR_OFFSET((map)->records, (idx) * (map)->hdr.record_size)) typedef int mail_index_expunge_handler_t(struct mail_index_sync_map_ctx *ctx, uint32_t seq, const void *data, void **context); typedef int mail_index_sync_handler_t(struct mail_index_sync_map_ctx *ctx, uint32_t seq, void *old_data, const void *new_data, void **context); typedef void mail_index_sync_lost_handler_t(struct mail_index *index); #define MAIL_INDEX_HEADER_SIZE_ALIGN(size) \ (((size) + 7) & ~7) struct mail_index_ext { const char *name; uint32_t index_idx; /* index ext_id */ uint32_t reset_id; uint32_t hdr_offset; uint32_t hdr_size; uint16_t record_offset; uint16_t record_size; uint16_t record_align; }; struct mail_index_ext_header { uint32_t hdr_size; uint32_t reset_id; uint16_t record_offset; uint16_t record_size; uint16_t record_align; uint16_t name_size; /* unsigned char name[] */ }; struct mail_index_map { int refcount; struct mail_index_header hdr; const void *hdr_base; void *records; /* struct mail_index_record[] */ unsigned int records_count; pool_t extension_pool; buffer_t *extensions; /* struct mail_index_ext[] */ buffer_t *ext_id_map; /* uint32_t[] (index -> file) */ void *mmap_base; size_t mmap_size, mmap_used_size; buffer_t *buffer; buffer_t *hdr_copy_buf; unsigned int write_to_disk:1; }; struct mail_index { char *dir, *prefix; struct mail_cache *cache; struct mail_transaction_log *log; mode_t mode; gid_t gid; pool_t extension_pool; buffer_t *extensions; /* struct mail_index_ext[] */ buffer_t *expunge_handlers; /* mail_index_expunge_handler_t*[] */ buffer_t *sync_handlers; /* mail_index_sync_handler_t*[] */ buffer_t *sync_lost_handlers; /* mail_index_sync_lost_handler_t*[] */ char *filepath; int fd; struct mail_index_map *map; const struct mail_index_header *hdr; uint32_t indexid; int lock_type, shared_lock_count, excl_lock_count; unsigned int lock_id; char *copy_lock_path; struct dotlock dotlock; enum mail_index_lock_method lock_method; /* These are typically same as map->hdr->log_file_*, but with mmap_disable we may have synced more than index */ uint32_t sync_log_file_seq; uoff_t sync_log_file_offset; unsigned int last_grow_count; char *error; unsigned int nodiskspace:1; unsigned int index_lock_timeout:1; unsigned int opened:1; unsigned int log_locked:1; unsigned int mmap_disable:1; unsigned int mmap_no_write:1; unsigned int readonly:1; unsigned int fsck:1; unsigned int sync_update:1; }; enum mail_index_sync_handler_type { MAIL_INDEX_SYNC_HANDLER_INDEX = 0x01, MAIL_INDEX_SYNC_HANDLER_VIEW = 0x02 }; struct mail_index_sync_handler { mail_index_sync_handler_t *callback; enum mail_index_sync_handler_type type; }; /* Add/replace sync handler for specified extra record. */ void mail_index_register_expunge_handler(struct mail_index *index, uint32_t ext_id, mail_index_expunge_handler_t *cb); void mail_index_register_sync_handler(struct mail_index *index, uint32_t ext_id, mail_index_sync_handler_t *cb, enum mail_index_sync_handler_type type); void mail_index_register_sync_lost_handler(struct mail_index *index, mail_index_sync_lost_handler_t *cb); int mail_index_write_base_header(struct mail_index *index, const struct mail_index_header *hdr); int mail_index_reopen(struct mail_index *index, int fd); int mail_index_create_tmp_file(struct mail_index *index, const char **path_r); /* Returns 0 = ok, -1 = error. If update_index is TRUE, reopens the index file if needed to get later version of it (not necessarily latest due to races, unless transaction log is exclusively locked). */ int mail_index_lock_shared(struct mail_index *index, int update_index, unsigned int *lock_id_r); /* Returns 0 = ok, -1 = error. */ int mail_index_lock_exclusive(struct mail_index *index, unsigned int *lock_id_r); void mail_index_unlock(struct mail_index *index, unsigned int lock_id); /* Returns 1 if given lock_id is valid, 0 if not. */ int mail_index_is_locked(struct mail_index *index, unsigned int lock_id); int mail_index_lock_fd(struct mail_index *index, const char *path, int fd, int lock_type, unsigned int timeout_secs); /* Reopen index file if it has changed. */ int mail_index_reopen_if_needed(struct mail_index *index); /* Map index file to memory, replacing the previous mapping for index. Returns 1 = ok, 0 = corrupted, -1 = error. If index needs fscking, it returns 1 but sets index->fsck = TRUE. */ int mail_index_map(struct mail_index *index, int force); /* Unreference given mapping and unmap it if it's dropped to zero. */ void mail_index_unmap(struct mail_index *index, struct mail_index_map *map); struct mail_index_map * mail_index_map_clone(struct mail_index_map *map, uint32_t new_record_size); uint32_t mail_index_map_lookup_ext(struct mail_index_map *map, const char *name); uint32_t mail_index_map_register_ext(struct mail_index *index, struct mail_index_map *map, const char *name, uint32_t hdr_offset, uint32_t hdr_size, uint32_t record_offset, uint32_t record_size, uint32_t record_align, uint32_t reset_id); int mail_index_map_get_ext_idx(struct mail_index_map *map, uint32_t ext_id, uint32_t *idx_r); const struct mail_index_ext * mail_index_view_get_ext(struct mail_index_view *view, uint32_t ext_id); int mail_index_fix_header(struct mail_index *index, struct mail_index_map *map, struct mail_index_header *hdr, const char **error_r); void mail_index_view_transaction_ref(struct mail_index_view *view); void mail_index_view_transaction_unref(struct mail_index_view *view); void mail_index_set_inconsistent(struct mail_index *index); int mail_index_set_error(struct mail_index *index, const char *fmt, ...) __attr_format__(2, 3); /* "%s failed with index file %s: %m" */ int mail_index_set_syscall_error(struct mail_index *index, const char *function); /* "%s failed with file %s: %m" */ int mail_index_file_set_syscall_error(struct mail_index *index, const char *filepath, const char *function); void mail_index_reset_error(struct mail_index *index); uint32_t mail_index_uint32_to_offset(uint32_t offset); uint32_t mail_index_offset_to_uint32(uint32_t offset); #endif