fix(mount): report correct nlink for directories (2 + subdirectory count)
POSIX requires directory nlink = 2 (for . and ..) + number of
subdirectories. Previously SeaweedFS reported nlink=1 for all dirs.
- Set nlink baseline to 2 for directories in setAttrByPbEntry,
setAttrByFilerEntry, and setRootAttr
- Add applyDirNlink() that counts subdirectories from the local
metacache and sets nlink = 2 + count
- Call it from GetAttr and Lookup for directory entries
When the metacache has no entries (before readdir), nlink=2 is used
as a safe POSIX-compliant default.
Chris LuandGitHub
39e76b8e94