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[t:4875], add some comments

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git-svn-id: file:///svn/toku/tokudb@43429 c7de825b-a66e-492c-adef-691d508d4ae1
This commit is contained in:
Zardosht Kasheff 2013-04-17 00:00:28 -04:00 • committed by Yoni Fogel
parent 445f9283d5
commit 9b6aa5a527
1 changed files with 11 additions and 2 deletions
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13
newbrt/brt_header.c
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@ -89,6 +89,7 @@ toku_brtheader_release_treelock(struct brt_header* h) {
// Start of Functions that are callbacks to the cachefule
//
// maps to cf->log_fassociate_during_checkpoint
static int
brtheader_log_fassociate_during_checkpoint (CACHEFILE cf, void *header_v) {
struct brt_header *h = header_v;
@ -101,6 +102,7 @@ brtheader_log_fassociate_during_checkpoint (CACHEFILE cf, void *header_v) {
return r;
}
// maps to cf->log_suppress_rollback_during_checkpoint
static int
brtheader_log_suppress_rollback_during_checkpoint (CACHEFILE cf, void *header_v) {
int r = 0;
@ -115,6 +117,7 @@ brtheader_log_suppress_rollback_during_checkpoint (CACHEFILE cf, void *header_v)
return r;
}
// Maps to cf->begin_checkpoint_userdata
// Create checkpoint-in-progress versions of header and translation (btt) (and fifo for now...).
//Has access to fd (it is protected).
static int
@ -137,6 +140,7 @@ brtheader_begin_checkpoint (LSN checkpoint_lsn, void *header_v) {
return r;
}
// maps to cf->checkpoint_userdata
// Write checkpoint-in-progress versions of header and translation to disk (really to OS internal buffer).
// Copy current header's version of checkpoint_staging stat64info to checkpoint header.
// Must have access to fd (protected).
@ -205,6 +209,7 @@ handle_error:
}
// maps to cf->end_checkpoint_userdata
// free unused disk space
// (i.e. tell BlockAllocator to liberate blocks used by previous checkpoint).
// Must have access to fd (protected)
@ -223,7 +228,8 @@ brtheader_end_checkpoint (CACHEFILE UU(cachefile), int fd, void *header_v) {
return r;
}
//Has access to fd (it is protected).
// maps to cf->close_userdata
// Has access to fd (it is protected).
static int
brtheader_close (CACHEFILE cachefile, int fd, void *header_v, char **malloced_error_string, BOOL oplsn_valid, LSN oplsn) {
struct brt_header *h = header_v;
@ -281,6 +287,7 @@ brtheader_close (CACHEFILE cachefile, int fd, void *header_v, char **malloced_er
return r;
}
// maps to cf->note_pin_by_checkpoint
//Must be protected by ydb lock.
//Is only called by checkpoint begin, which holds it
static int
@ -294,6 +301,7 @@ brtheader_note_pin_by_checkpoint (CACHEFILE UU(cachefile), void *header_v)
return 0;
}
// maps to cf->note_unpin_by_checkpoint
//Must be protected by ydb lock.
//Called by end_checkpoint, which grabs ydb lock around note_unpin
static int
@ -335,7 +343,8 @@ static int setup_initial_brtheader_root_node (struct brt_header* h, BLOCKNUM blo
return r;
}
// TODO: (Zardosht) move this functionality to brt_init_header
// No need in having brt_init_header call this function
static int
brt_init_header_partial (BRT t, CACHEFILE cf, TOKUTXN txn) {
int r;