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Btrfs: do not warn_on io_ctl->cur in io_ctl_map_page 

io_ctl_map_page is called by many functions in free-space-cache.
In most scenarios, the ->cur is not null, e.g. io_ctl_add_entry.
I think we'd better remove the warn_on here.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Wang Sheng-Hui 2012-11-23 03:03:14 +00:00 committed by Chris Mason
parent 3f6bcfbd41
commit 071401258a
1 changed files with 0 additions and 1 deletions
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fs/btrfs/free-space-cache.c
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@ -307,7 +307,6 @@ static void io_ctl_unmap_page(struct io_ctl *io_ctl)
static void io_ctl_map_page(struct io_ctl *io_ctl, int clear)
{
WARN_ON(io_ctl->cur);
BUG_ON(io_ctl->index >= io_ctl->num_pages);
io_ctl->page = io_ctl->pages[io_ctl->index++];
io_ctl->cur = kmap(io_ctl->page);