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Deal with page == NULL in the btrfs_unplug_io_fn 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
hifive-unleashed-5.1
Chris Mason 2008-04-22 09:22:11 -04:00
parent b30757178d
commit 38b669880d
1 changed files with 30 additions and 2 deletions
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32
fs/btrfs/disk-io.c
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@ -911,12 +911,40 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
return ret;
}
/*
* this unplugs every device on the box, and it is only used when page
* is null
*/
static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
struct list_head *cur;
struct btrfs_device *device;
struct btrfs_fs_info *info;
info = (struct btrfs_fs_info *)bdi->unplug_io_data;
list_for_each(cur, &info->fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
bdi = blk_get_backing_dev_info(device->bdev);
if (bdi->unplug_io_fn) {
bdi->unplug_io_fn(bdi, page);
}
}
}
void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
struct inode *inode = page->mapping->host;
struct inode *inode;
struct extent_map_tree *em_tree;
struct extent_map *em;
u64 offset = page_offset(page);
u64 offset;
if (!page) {
__unplug_io_fn(bdi, page);
return;
}
inode = page->mapping->host;
offset = page_offset(page);
em_tree = &BTRFS_I(inode)->extent_tree;
spin_lock(&em_tree->lock);