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af250f7732
Scan the roots tree directly for roots other than 5 (the FS root), and use btrfs_get_root_transid on root_fd for root 5. This avoids filling up the root FD cache every time we want a new transid_max. Now the only reason we open a subvol root FD is to open a file within the subvol. transid_max may be the same as the FS root's transid, in which case the search loop is not necessary. Place a counter (transid_max_miss) to see if we ever need to look at root items. If this counter never goes above zero, or does so very rarely, we can delete the search loop. Signed-off-by: Zygo Blaxell <bees@furryterror.org>