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btrfs: Rename find_oldest_super_backup to init_backup_root_slot 

The old name name was an awful misnomer because it didn't really find
the oldest super backup per-se but rather its slot. For example if we
have:

slot0: gen - 2
slot1: gen - 1
slot2: gen
slot3: empty

init_backup_root_slot will return slot3 and not slot0.

The new name is more appropriate since the function doesn't care whether
there is a valid backup in the returned slot or not.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2019-10-15 18:42:23 +03:00 committed by David Sterba
parent 260eb11bd4
commit 4ac039ad75
1 changed files with 4 additions and 6 deletions
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10
fs/btrfs/disk-io.c
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@ -1815,13 +1815,11 @@ static int find_newest_super_backup(struct btrfs_fs_info *info)
return -EINVAL;
}
/*
* find the oldest backup so we know where to store new entries
* in the backup array. This will set the backup_root_index
* field in the fs_info struct
* Initialize backup_root_index with the next available slot, where subsequent
* transaction commit will store the backup root
*/
static void find_oldest_super_backup(struct btrfs_fs_info *info)
static void init_backup_root_slot(struct btrfs_fs_info *info)
{
int newest_index;
@ -2935,7 +2933,7 @@ int __cold open_ctree(struct super_block *sb,
* run through our array of backup supers and setup
* our ring pointer to the oldest one
*/
find_oldest_super_backup(fs_info);
init_backup_root_slot(fs_info);
/*
* In the long term, we'll store the compression type in the super