jffs2: Erase pending blocks in GC pass, avoid invalid -EIO return

jffs2_garbage_collect_pass() would previously return -EAGAIN if it
couldn't find anything to garbage collect from, and there were blocks on
the erase_pending_list. If the blocks were actually in the process of
being erased, though, then they wouldn't be on that list. Check for
nr_erasing_blocks being non-zero instead.

Fix jffs2_reserve_space() to wait for the in-progress erases to
complete, when jffs2_garbage_collect_pass() returns -EAGAIN.

And fix jffs2_erase_succeeded() to actually wake up the erase_wait wq
that jffs2_reserve_space() is now using.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
index b2d2b6a6e03e..563c857ca544 100644
--- a/fs/jffs2/erase.c
+++ b/fs/jffs2/erase.c
@@ -172,6 +172,7 @@ static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblo
 	mutex_unlock(&c->erase_free_sem);
 	/* Ensure that kupdated calls us again to mark them clean */
 	jffs2_erase_pending_trigger(c);
+	wake_up(&c->erase_wait);
 }
 
 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)