kernel/git/stable/linux.git/fs/btrfs/root-tree.c, branch linux-5.8.y

btrfs: simplify root lookup by id

2020-05-25T09:25:36+00:00

The main function to lookup a root by its id btrfs_get_fs_root takes the whole key, while only using the objectid. The value of offset is preset to (u64)-1 but not actually used until btrfs_find_root that does the actual search. Switch btrfs_get_fs_root to use only objectid and remove all local variables that existed just for the lookup. The actual key for search is set up in btrfs_get_fs_root, reusing another key variable. Signed-off-by: David Sterba

btrfs: Remove __ prefix from btrfs_block_rsv_release

2020-03-23T16:01:55+00:00

Currently the non-prefixed version is a simple wrapper used to hide the 4th argument of the prefixed version. This doesn't bring much value in practice and only makes the code harder to follow by adding another level of indirection. Rectify this by removing the __ prefix and have only one public function to release bytes from a block reservation. No semantic changes. Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: switch to use new generic UUID API

2020-03-23T16:01:47+00:00

There are new types and helpers that are supposed to be used in new code. As a preparation to get rid of legacy types and API functions do the conversion here. Reviewed-by: Christoph Hellwig Signed-off-by: Andy Shevchenko Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: rename btrfs_put_fs_root and btrfs_grab_fs_root

2020-03-23T16:01:33+00:00

We are now using these for all roots, rename them to btrfs_put_root() and btrfs_grab_root(); Reviewed-by: Nikolay Borisov Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: push btrfs_grab_fs_root into btrfs_get_fs_root

2020-03-23T16:01:32+00:00

Now that all callers of btrfs_get_fs_root are subsequently calling btrfs_grab_fs_root and handling dropping the ref when they are done appropriately, go ahead and push btrfs_grab_fs_root up into btrfs_get_fs_root. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: hold a ref for the root in btrfs_find_orphan_roots

2020-03-23T16:01:30+00:00

We lookup roots for every orphan item we have, we need to hold a ref on the root while we're doing this work. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: make btrfs_find_orphan_roots use btrfs_get_fs_root

2020-03-23T16:01:25+00:00

btrfs_find_orphan_roots has this weird thing where it looks up the root in cache to see if it is there before just reading the root. But the read it uses just reads the root, it doesn't do any of the init work, we do that by hand here. But this is unnecessary, all we really want is to see if the root still exists and add it to the dead roots list to be cleaned up, otherwise we delete the orphan item. Fix this by just using btrfs_get_fs_root directly with check_ref set to false so we get the orphan root items. Then we just handle in cache and out of cache roots the same, add them to the dead roots list and carry on. Reviewed-by: Nikolay Borisov Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: do not delete mismatched root refs

2020-01-08T13:44:24+00:00

btrfs_del_root_ref() will simply WARN_ON() if the ref doesn't match in any way, and then continue to delete the reference. This shouldn't happen, we have these values because there's more to the reference than the original root and the sub root. If any of these checks fail, return -ENOENT. CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: rename the btrfs_calc_*_metadata_size helpers

2019-09-09T12:59:13+00:00

btrfs_calc_trunc_metadata_size differs from trans_metadata_size in that it doesn't take into account any splitting at the levels, because truncate will never split nodes. However truncate _and_ changing will never split nodes, so rename btrfs_calc_trunc_metadata_size to btrfs_calc_metadata_size. Also btrfs_calc_trans_metadata_size is purely for inserting items, so rename this to btrfs_calc_insert_metadata_size. Making these clearer will help when I start using them differently in upcoming patches. Reviewed-by: Nikolay Borisov Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: move the subvolume reservation stuff out of extent-tree.c

2019-07-04T15:26:18+00:00

This is just two functions, put it in root-tree.c since it involves root items. Signed-off-by: Josef Bacik Signed-off-by: David Sterba