FS Implementation 2.In-memory information:For both FS management and performence improvement via caching Data are loaded at mount time and discarded at dismount Structures include: in-memory mount table; in-memory directory-structure cache system-wide open-file table; per-process open-file table 4口”4814在，4色，主)QC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FS Implementation 2. In-memory information: For both FS management and performence improvement via caching ▶ Data are loaded at mount time and discarded at dismount ▶ Structures include: ▶ in-memory mount table; ▶ in-memory directory-structure cache ▶ system-wide open-file table; ▶ per-process open-file table