From ad081f1430515d0b727eba99ec435a526c61a599 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 12 Jun 2009 14:43:40 +0200 Subject: [PATCH] btrfs: properly register fs backing device btrfs assigns this bdi to all inodes on that file system, so make sure it's registered. This isn't really important now, but will be when we put dirty inodes there. Even now, we miss the stats when the bdi isn't visible. Also fixes failure to check bdi_init() return value, and bad inherit of ->capabilities flags from the default bdi. Acked-by: Chris Mason Signed-off-by: Jens Axboe --- fs/btrfs/disk-io.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 0d50d49d990..d28d29c95f7 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -42,6 +42,8 @@ static struct extent_io_ops btree_extent_io_ops; static void end_workqueue_fn(struct btrfs_work *work); +static atomic_t btrfs_bdi_num = ATOMIC_INIT(0); + /* * end_io_wq structs are used to do processing in task context when an IO is * complete. This is used during reads to verify checksums, and it is used @@ -1342,12 +1344,25 @@ static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) free_extent_map(em); } +/* + * If this fails, caller must call bdi_destroy() to get rid of the + * bdi again. + */ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) { - bdi_init(bdi); + int err; + + bdi->capabilities = BDI_CAP_MAP_COPY; + err = bdi_init(bdi); + if (err) + return err; + + err = bdi_register(bdi, NULL, "btrfs-%d", + atomic_inc_return(&btrfs_bdi_num)); + if (err) + return err; + bdi->ra_pages = default_backing_dev_info.ra_pages; - bdi->state = 0; - bdi->capabilities = default_backing_dev_info.capabilities; bdi->unplug_io_fn = btrfs_unplug_io_fn; bdi->unplug_io_data = info; bdi->congested_fn = btrfs_congested_fn; @@ -1569,7 +1584,8 @@ struct btrfs_root *open_ctree(struct super_block *sb, fs_info->sb = sb; fs_info->max_extent = (u64)-1; fs_info->max_inline = 8192 * 1024; - setup_bdi(fs_info, &fs_info->bdi); + if (setup_bdi(fs_info, &fs_info->bdi)) + goto fail_bdi; fs_info->btree_inode = new_inode(sb); fs_info->btree_inode->i_ino = 1; fs_info->btree_inode->i_nlink = 1; @@ -1946,8 +1962,8 @@ fail_iput: btrfs_close_devices(fs_info->fs_devices); btrfs_mapping_tree_free(&fs_info->mapping_tree); +fail_bdi: bdi_destroy(&fs_info->bdi); - fail: kfree(extent_root); kfree(tree_root); -- 2.32.0.93.g670b81a890