Author: adrian.chadd
Date: Wed May 6 23:27:04 2009
New Revision: 14047
Modified:
branches/LUSCA_HEAD/src/fs/aufs/store_log_aufs.c
Log:
More documentation.
Modified: branches/LUSCA_HEAD/src/fs/aufs/store_log_aufs.c
==============================================================================
--- branches/LUSCA_HEAD/src/fs/aufs/store_log_aufs.c (original)
+++ branches/LUSCA_HEAD/src/fs/aufs/store_log_aufs.c Wed May 6 23:27:04
2009
@@ -197,6 +197,30 @@
(FREE *) storeSwapLogDataFree);
}
+/*!
+ * @function
+ * storeAufsDirOpenTmpSwapLog
+ * @abstract
+ * Check the current log file state; close the current swaplog and open a
temporary swaplog
+ * @discussion
+ * This function does a bunch of checks before it opens the temporary
swaplog.
+ *
+ * It closes the current swaplog before opening a temporary one.
+ *
+ * It then opens a ".new" temporary swaplog and assigns that to the
current swaplog;
+ * so new items which enter the store are written out to that swaplog.
+ *
+ * It then opens a read-only filedescriptor for the -normal- swaplog so
items
+ * can be read from that.
+ *
+ * Finally, some logic is run through to see whether the last written
swaplog
+ * is "clean" (ie, is a snapshot of the last good state) or dirty.
+ *
+ * @param sd SwapDir to open the temporary swaplog for
+ * @param clean_flag return whether the last swaplog written out
was "clean"
+ * @param zero_flag Return whether the current swaplog size is 0
bytes or
not
+ * @return -1 on error, fd on an opened swaplog for reading.
+ */
int
storeAufsDirOpenTmpSwapLog(SwapDir * sd, int *clean_flag, int *zero_flag)
{
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