X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftdb2.h;h=d5ae329a6029d7659886992dd380e845bd9d2fb4;hp=296410e74196573a955470b78c422daa870f8be5;hb=1a0c636bc38213bd0322db47529f78f2dc22ffdd;hpb=703cea0c78a896c658272af06306218fc0bb23cc diff --git a/ccan/tdb2/tdb2.h b/ccan/tdb2/tdb2.h index 296410e7..d5ae329a 100644 --- a/ccan/tdb2/tdb2.h +++ b/ccan/tdb2/tdb2.h @@ -30,6 +30,10 @@ extern "C" { #endif #ifndef _SAMBA_BUILD_ +#include "config.h" +#if HAVE_FILE_OFFSET_BITS +#define _FILE_OFFSET_BITS 64 +#endif /* For mode_t */ #include /* For O_* flags. */ @@ -80,6 +84,8 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags, #define TDB_CONVERT 16 /* convert endian */ #define TDB_NOSYNC 64 /* don't use synchronous transactions */ #define TDB_SEQNUM 128 /* maintain a sequence number */ +#define TDB_ALLOW_NESTING 256 /* fake nested transactions */ +#define TDB_RDONLY 512 /* implied by O_RDONLY */ /** * tdb_close - close and free a tdb. @@ -248,6 +254,15 @@ static inline struct tdb_data tdb_mkdata(const void *p, size_t len) * to read the tdb, but not alter it (they will block), nor will they see * any changes until tdb_transaction_commit() is called. * + * Note that if the TDB_ALLOW_NESTING flag is set, a tdb_transaction_start() + * within a transaction will succeed, but it's not a real transaction: + * (1) An inner transaction which is committed is not actually committed until + * the outer transaction is; if the outer transaction is cancelled, the + * inner ones are discarded. + * (2) tdb_transaction_cancel() marks the outer transaction as having an error, + * so the final tdb_transaction_commit() will fail. + * (3) the outer transaction will see the results of the inner transaction. + * * See Also: * tdb_transaction_cancel, tdb_transaction_commit. */ @@ -565,7 +580,7 @@ unsigned int tdb_get_flags(struct tdb_context *tdb); /** * tdb_add_flag - set a flag for a tdb * @tdb: the tdb context returned from tdb_open() - * @flag: one of TDB_NOLOCK, TDB_NOMMAP or TDB_NOSYNC. + * @flag: one of TDB_NOLOCK, TDB_NOMMAP, TDB_NOSYNC or TDB_ALLOW_NESTING. * * You can use this to set a flag on the TDB. You cannot set these flags * on a TDB_INTERNAL tdb. @@ -575,7 +590,7 @@ void tdb_add_flag(struct tdb_context *tdb, unsigned flag); /** * tdb_remove_flag - unset a flag for a tdb * @tdb: the tdb context returned from tdb_open() - * @flag: one of TDB_NOLOCK, TDB_NOMMAP or TDB_NOSYNC. + * @flag: one of TDB_NOLOCK, TDB_NOMMAP, TDB_NOSYNC or TDB_ALLOW_NESTING. * * You can use this to clear a flag on the TDB. You cannot clear flags * on a TDB_INTERNAL tdb. @@ -602,8 +617,6 @@ enum tdb_attribute_type { * This gets an attribute from a TDB which has previously been set (or * may return the default values). Set @attr.base.attr to the * attribute type you want get. - * - * Currently this does not work for TDB_ATTRIBUTE_OPENHOOK. */ enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb, union tdb_attribute *attr); @@ -657,6 +670,20 @@ const char *tdb_name(const struct tdb_context *tdb); */ int tdb_fd(const struct tdb_context *tdb); +/** + * tdb_foreach - iterate through every open TDB. + * @fn: the function to call for every TDB + * @p: the pointer to hand to @fn + * + * TDB internally keeps track of all open TDBs; this function allows you to + * iterate through them. If @fn returns non-zero, traversal stops. + */ +#define tdb_foreach(fn, p) \ + tdb_foreach_(typesafe_cb_preargs(int, void *, (fn), (p), \ + struct tdb_context *), (p)) + +void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p); + /** * struct tdb_attribute_base - common fields for all tdb attributes. */ @@ -690,6 +717,7 @@ struct tdb_attribute_log { struct tdb_attribute_base base; /* .attr = TDB_ATTRIBUTE_LOG */ void (*fn)(struct tdb_context *tdb, enum tdb_log_level level, + enum TDB_ERROR ecode, const char *message, void *data); void *data; @@ -729,13 +757,13 @@ struct tdb_attribute_seed { * struct tdb_attribute_stats - tdb operational statistics * * This attribute records statistics of various low-level TDB operations. - * This can be used to assist performance evaluation. + * This can be used to assist performance evaluation. This is only + * useful for tdb_get_attribute(). * * New fields will be added at the end, hence the "size" argument which - * indicates how large your structure is. If your size is larger than - * that known about by this version of tdb, the size will be reduced to - * the known structure size. Thus you can detect older versions, and - * thus know that newer stats will not be updated. + * indicates how large your structure is: it must be filled in before + * calling tdb_get_attribute(), which will overwrite it with the size + * tdb knows about. */ struct tdb_attribute_stats { struct tdb_attribute_base base; /* .attr = TDB_ATTRIBUTE_STATS */ @@ -747,21 +775,31 @@ struct tdb_attribute_stats { uint64_t alloc_bucket_max; uint64_t alloc_leftover; uint64_t alloc_coalesce_tried; + uint64_t alloc_coalesce_iterate_clash; uint64_t alloc_coalesce_lockfail; uint64_t alloc_coalesce_race; uint64_t alloc_coalesce_succeeded; - uint64_t alloc_coalesce_num_merged; + uint64_t alloc_coalesce_num_merged; uint64_t compares; uint64_t compare_wrong_bucket; uint64_t compare_wrong_offsetbits; uint64_t compare_wrong_keylen; uint64_t compare_wrong_rechash; uint64_t compare_wrong_keycmp; + uint64_t transactions; + uint64_t transaction_cancel; + uint64_t transaction_nest; + uint64_t transaction_expand_file; + uint64_t transaction_read_direct; + uint64_t transaction_read_direct_fail; + uint64_t transaction_write_direct; + uint64_t transaction_write_direct_fail; uint64_t expands; uint64_t frees; uint64_t locks; - uint64_t lock_lowlevel; - uint64_t lock_nonblock; + uint64_t lock_lowlevel; + uint64_t lock_nonblock; + uint64_t lock_nonblock_fail; }; /**