Currently, we determine the live vs. total snapshot size by listing all files in the snapshot directory,
and for each name, look it up in the base table directory and see if it exists there, and if so, if it's the same file
as in the snapshot by looking to the fstat data for the dev id and inode number.
However, we do not look the names in the staging directory so staging sstable
would skew the results as the will falsely contribute to the live size, since they
wouldn't be found in the base directory.
This change processes both the staging directory and base table directory
and keeps the file capacity in a map, indexed by the files inode number, allowing us to easily
detect hard links and be resilient against concurrent move of files from the staging sub-directory
back into the base table directory.
Fixes#27635
* Minor issue, no backport required
Closesscylladb/scylladb#27636
* github.com:scylladb/scylladb:
table: get_snapshot_details: add FIXME comments
table: get_snapshot_details: lookup entries also in the staging directory
table: get_snapshot_details: optimize using the entry number_of_links
table: get_snapshot_details: continue loop for manifest and schema entries
table: get_snapshot_details: use directory_lister
846a6e700b