diff options
Diffstat (limited to 'internal/openfiletable/inummap.go')
-rw-r--r-- | internal/openfiletable/inummap.go | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/internal/openfiletable/inummap.go b/internal/openfiletable/inummap.go deleted file mode 100644 index d9f6862..0000000 --- a/internal/openfiletable/inummap.go +++ /dev/null @@ -1,63 +0,0 @@ -package openfiletable - -import ( - "sync" - "syscall" -) - -// UINT64_MAX = 18446744073709551615 -const inumTranslateBase = 10000000000000000000 - -// InumMap ... see NewInumMap() for description. -type InumMap struct { - sync.Mutex - baseDev uint64 - translate map[QIno]uint64 - translateNext uint64 -} - -// NewInumMap returns a new inumMap. -// -// inumMap translates (device uint64, inode uint64) pairs to unique uint64 -// inode numbers. -// Inode numbers on the "baseDev" are passed through unchanged (as long as they -// are not higher than inumTranslateBase). -// Inode numbers on other devices are remapped to the number space above -// 10000000000000000000. The mapping is stored in a simple Go map. Entries -// can only be added and are never removed. -func NewInumMap(baseDev uint64) *InumMap { - return &InumMap{ - baseDev: baseDev, - translate: make(map[QIno]uint64), - translateNext: inumTranslateBase, - } -} - -// Translate maps the passed-in (device, inode) pair to a unique inode number. -func (m *InumMap) Translate(in QIno) (out uint64) { - if in.Dev == m.baseDev && in.Ino < inumTranslateBase { - return in.Ino - } - m.Lock() - defer m.Unlock() - out = m.translate[in] - if out != 0 { - return out - } - out = m.translateNext - m.translate[in] = m.translateNext - m.translateNext++ - return out -} - -// TranslateStat translates the inode number contained in "st" if neccessary. -// Convience wrapper around Translate(). -func (m *InumMap) TranslateStat(st *syscall.Stat_t) { - in := QInoFromStat(st) - st.Ino = m.Translate(in) -} - -// Count returns the number of entries in the translation table. -func (m *InumMap) Count() int { - return len(m.translate) -} |