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src/subversion/subversion/libsvn_fs_fs/fs.h  view on Meta::CPAN

/* The minimum format number that maintains minfo-here and minfo-count
   noderev fields. */
#define SVN_FS_FS__MIN_MERGEINFO_FORMAT 3

/* The minimum format number that allows rep sharing. */
#define SVN_FS_FS__MIN_REP_SHARING_FORMAT 4

/* The minimum format number that supports packed shards. */
#define SVN_FS_FS__MIN_PACKED_FORMAT 4

/* The minimum format number that stores node kinds in changed-paths lists. */
#define SVN_FS_FS__MIN_KIND_IN_CHANGED_FORMAT 4

/* 1.8 deltification options should work with any FSFS repo but to avoid
 * issues with very old servers, restrict those options to the 1.6+ format*/
#define SVN_FS_FS__MIN_DELTIFICATION_FORMAT 4

/* The 1.7-dev format, never released, that packed revprops into SQLite
   revprops.db . */
#define SVN_FS_FS__PACKED_REVPROP_SQLITE_DEV_FORMAT 5

/* The minimum format number that supports packed revprops. */
#define SVN_FS_FS__MIN_PACKED_REVPROP_FORMAT 6

/* The minimum format number that supports a configuration file (fsfs.conf) */
#define SVN_FS_FS__MIN_CONFIG_FILE 4

/* Private FSFS-specific data shared between all svn_txn_t objects that
   relate to a particular transaction in a filesystem (as identified
   by transaction id and filesystem UUID).  Objects of this type are
   allocated in their own subpool of the common pool. */
typedef struct fs_fs_shared_txn_data_t
{
  /* The next transaction in the list, or NULL if there is no following
     transaction. */
  struct fs_fs_shared_txn_data_t *next;

  /* This transaction's ID.  For repositories whose format is less
     than SVN_FS_FS__MIN_TXN_CURRENT_FORMAT, the ID is in the form
     <rev>-<uniqueifier>, where <uniqueifier> runs from 0-99999 (see
     create_txn_dir_pre_1_5() in fs_fs.c).  For newer repositories,
     the form is <rev>-<200 digit base 36 number> (see
     create_txn_dir() in fs_fs.c). */
  char txn_id[SVN_FS__TXN_MAX_LEN+1];

  /* Whether the transaction's prototype revision file is locked for
     writing by any thread in this process (including the current
     thread; recursive locks are not permitted).  This is effectively
     a non-recursive mutex. */
  svn_boolean_t being_written;

  /* The pool in which this object has been allocated; a subpool of the
     common pool. */
  apr_pool_t *pool;
} fs_fs_shared_txn_data_t;

/* On most operating systems apr implements file locks per process, not
   per file.  On Windows apr implements the locking as per file handle
   locks, so we don't have to add our own mutex for just in-process
   synchronization. */
/* Compare ../libsvn_subr/named_atomic.c:USE_THREAD_MUTEX */
#if APR_HAS_THREADS && !defined(WIN32)
#define SVN_FS_FS__USE_LOCK_MUTEX 1
#else
#define SVN_FS_FS__USE_LOCK_MUTEX 0
#endif

/* Private FSFS-specific data shared between all svn_fs_t objects that
   relate to a particular filesystem, as identified by filesystem UUID.
   Objects of this type are allocated in the common pool. */
typedef struct fs_fs_shared_data_t
{
  /* A list of shared transaction objects for each transaction that is
     currently active, or NULL if none are.  All access to this list,
     including the contents of the objects stored in it, is synchronised
     under TXN_LIST_LOCK. */
  fs_fs_shared_txn_data_t *txns;

  /* A free transaction object, or NULL if there is no free object.
     Access to this object is synchronised under TXN_LIST_LOCK. */
  fs_fs_shared_txn_data_t *free_txn;

  /* A lock for intra-process synchronization when accessing the TXNS list. */
  svn_mutex__t *txn_list_lock;

  /* A lock for intra-process synchronization when grabbing the
     repository write lock. */
  svn_mutex__t *fs_write_lock;

  /* A lock for intra-process synchronization when locking the
     txn-current file. */
  svn_mutex__t *txn_current_lock;

  /* The common pool, under which this object is allocated, subpools
     of which are used to allocate the transaction objects. */
  apr_pool_t *common_pool;
} fs_fs_shared_data_t;

/* Data structure for the 1st level DAG node cache. */
typedef struct fs_fs_dag_cache_t fs_fs_dag_cache_t;

/* Key type for all caches that use revision + offset / counter as key. */
typedef struct pair_cache_key_t
{
  svn_revnum_t revision;

  apr_int64_t second;
} pair_cache_key_t;

/* Private (non-shared) FSFS-specific data for each svn_fs_t object.
   Any caches in here may be NULL. */
typedef struct fs_fs_data_t
{
  /* The format number of this FS. */
  int format;
  /* The maximum number of files to store per directory (for sharded
     layouts) or zero (for linear layouts). */
  int max_files_per_dir;

  /* The revision that was youngest, last time we checked. */
  svn_revnum_t youngest_rev_cache;

  /* The fsfs.conf file, parsed.  Allocated in FS->pool. */
  svn_config_t *config;

  /* Caches of immutable data.  (Note that if these are created with
     svn_cache__create_memcache, the data can be shared between
     multiple svn_fs_t's for the same filesystem.) */

  /* A cache of revision root IDs, mapping from (svn_revnum_t *) to
     (svn_fs_id_t *).  (Not threadsafe.) */
  svn_cache__t *rev_root_id_cache;

  /* Caches native dag_node_t* instances and acts as a 1st level cache */
  fs_fs_dag_cache_t *dag_node_cache;

  /* DAG node cache for immutable nodes.  Maps (revision, fspath)
     to (dag_node_t *). This is the 2nd level cache for DAG nodes. */
  svn_cache__t *rev_node_cache;

  /* A cache of the contents of immutable directories; maps from
     unparsed FS ID to a apr_hash_t * mapping (const char *) dirent
     names to (svn_fs_dirent_t *). */
  svn_cache__t *dir_cache;

  /* Fulltext cache; currently only used with memcached.  Maps from
     rep key (revision/offset) to svn_stringbuf_t. */
  svn_cache__t *fulltext_cache;

  /* Access object to the atomics namespace used by revprop caching.