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189e0fe5a9
Hard links to the same file now get the same inode within the FUSE
mount. Also, inode generation is faster and, more importantly, no longer
allocates.
Benchmarked on Linux/amd64. Old means the benchmark with
sink = fs.GenerateDynamicInode(1, sub.node.Name)
instead of calling inodeFromNode. Results:
name old time/op new time/op delta
Inode/no_hard_links-8 137ns ± 4% 34ns ± 1% -75.20% (p=0.000 n=10+10)
Inode/hard_link-8 33.6ns ± 1% 9.5ns ± 0% -71.82% (p=0.000 n=9+8)
name old alloc/op new alloc/op delta
Inode/no_hard_links-8 48.0B ± 0% 0.0B -100.00% (p=0.000 n=10+10)
Inode/hard_link-8 0.00B 0.00B ~ (all equal)
name old allocs/op new allocs/op delta
Inode/no_hard_links-8 1.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10)
Inode/hard_link-8 0.00 0.00 ~ (all equal)
44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
//go:build darwin || freebsd || linux
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// +build darwin freebsd linux
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package fuse
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import (
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"encoding/binary"
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"github.com/cespare/xxhash/v2"
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"github.com/restic/restic/internal/restic"
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)
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// inodeFromName generates an inode number for a file in a meta dir.
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func inodeFromName(parent uint64, name string) uint64 {
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inode := parent ^ xxhash.Sum64String(cleanupNodeName(name))
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// Inode 0 is invalid and 1 is the root. Remap those.
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if inode < 2 {
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inode += 2
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}
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return inode
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}
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// inodeFromNode generates an inode number for a file within a snapshot.
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func inodeFromNode(parent uint64, node *restic.Node) (inode uint64) {
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if node.Links > 1 && node.Type != "dir" {
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// If node has hard links, give them all the same inode,
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// irrespective of the parent.
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var buf [16]byte
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binary.LittleEndian.PutUint64(buf[:8], node.DeviceID)
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binary.LittleEndian.PutUint64(buf[8:], node.Inode)
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inode = xxhash.Sum64(buf[:])
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} else {
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// Else, use the name and the parent inode.
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// node.{DeviceID,Inode} may not even be reliable.
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inode = parent ^ xxhash.Sum64String(cleanupNodeName(node.Name))
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}
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// Inode 0 is invalid and 1 is the root. Remap those.
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if inode < 2 {
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inode += 2
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}
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return inode
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}
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