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bcache: Write out full stripes

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Now that we're tracking dirty data per stripe, we can add two
optimizations for raid5/6:

 * If a stripe is already dirty, force writes to that stripe to
   writeback mode - to help build up full stripes of dirty data

 * When flushing dirty data, preferentially write out full stripes first
   if there are any.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
This commit is contained in:
Kent Overstreet
2013-06-05 06:24:39 -07:00
parent 279afbad4e
commit 72c270612b
9 changed files with 121 additions and 37 deletions
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4
drivers/md/bcache/debug.c
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@@ -357,7 +357,7 @@ static ssize_t bch_dump_read(struct file *file, char __user *buf,
if (i->bytes)
break;
w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY);
w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY, dump_pred);
if (!w)
break;
@@ -380,7 +380,7 @@ static int bch_dump_open(struct inode *inode, struct file *file)
file->private_data = i;
i->c = c;
bch_keybuf_init(&i->keys, dump_pred);
bch_keybuf_init(&i->keys);
i->keys.last_scanned = KEY(0, 0, 0);
return 0;