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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-21 17:17:21 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 19:07:45 -0700
commit77ad4bc706fe6c52ab953f31c287a6af712d080c (patch)
tree6823261d0e111a93c5190ebb1f2ecd8c4905a559 /include
parentbfb39fba4e8cdda091f9ebee29fbb8331c4bb605 (diff)
[PATCH] md: enable the bitmap write-back daemon and wait for it.
Currently we don't wait for updates to the bitmap to be flushed to disk properly. The infrastructure all there, but it isn't being used.... A separate kernel thread (bitmap_writeback_daemon) is needed to wait for each page as we cannot get callbacks when a page write completes. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/raid/bitmap.h13
1 files changed, 2 insertions, 11 deletions
diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h
index f785cf26cba..cfe60cfc8f3 100644
--- a/include/linux/raid/bitmap.h
+++ b/include/linux/raid/bitmap.h
@@ -233,21 +233,12 @@ struct bitmap {
unsigned long daemon_sleep; /* how many seconds between updates? */
/*
- * bitmap write daemon - this daemon performs writes to the bitmap file
- * this thread is only needed because of a limitation in ext3 (jbd)
- * that does not allow a task to have two journal transactions ongoing
- * simultaneously (even if the transactions are for two different
- * filesystems) -- in the case of bitmap, that would be the filesystem
- * that the bitmap file resides on and the filesystem that is mounted
- * on the md device -- see current->journal_info in jbd/transaction.c
+ * bitmap_writeback_daemon waits for file-pages that have been written,
+ * as there is no way to get a call-back when a page write completes.
*/
mdk_thread_t *writeback_daemon;
spinlock_t write_lock;
- struct semaphore write_ready;
- struct semaphore write_done;
- unsigned long writes_pending;
wait_queue_head_t write_wait;
- struct list_head write_pages;
struct list_head complete_pages;
mempool_t *write_pool;
};