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vfs,mount,cmount: report 1PB free for unknown disk sizes

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Factor the logic into the VFS layer so we don't have to duplicate it
into mount and cmount.

See: https://forum.rclone.org/t/rclone-mount-question/15454/
This commit is contained in:
Nick Craig-Wood 2020-04-08 18:29:50 +01:00
parent 9f3449d944
commit da41db4712
4 changed files with 100 additions and 51 deletions
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28
cmd/cmount/fs.go
View File

@ -268,25 +268,15 @@ func (fsys *FS) Releasedir(path string, fh uint64) (errc int) {
func (fsys *FS) Statfs(path string, stat *fuse.Statfs_t) (errc int) {
defer log.Trace(path, "")("stat=%+v, errc=%d", stat, &errc)
const blockSize = 4096
const fsBlocks = (1 << 50) / blockSize
stat.Blocks = fsBlocks // Total data blocks in file system.
stat.Bfree = fsBlocks // Free blocks in file system.
stat.Bavail = fsBlocks // Free blocks in file system if you're not root.
stat.Files = 1e9 // Total files in file system.
stat.Ffree = 1e9 // Free files in file system.
stat.Bsize = blockSize // Block size
stat.Namemax = 255 // Maximum file name length?
stat.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
total, used, free := fsys.VFS.Statfs()
if total >= 0 {
stat.Blocks = uint64(total) / blockSize
}
if used >= 0 {
stat.Bfree = stat.Blocks - uint64(used)/blockSize
}
if free >= 0 {
stat.Bavail = uint64(free) / blockSize
}
total, _, free := fsys.VFS.Statfs()
stat.Blocks = uint64(total) / blockSize // Total data blocks in file system.
stat.Bfree = uint64(free) / blockSize // Free blocks in file system.
stat.Bavail = stat.Bfree // Free blocks in file system if you're not root.
stat.Files = 1e9 // Total files in file system.
stat.Ffree = 1e9 // Free files in file system.
stat.Bsize = blockSize // Block size
stat.Namemax = 255 // Maximum file name length?
stat.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
mountlib.ClipBlocks(&stat.Blocks)
mountlib.ClipBlocks(&stat.Bfree)
mountlib.ClipBlocks(&stat.Bavail)

28
cmd/mount/fs.go
View File

@ -54,25 +54,15 @@ var _ fusefs.FSStatfser = (*FS)(nil)
func (f *FS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) (err error) {
defer log.Trace("", "")("stat=%+v, err=%v", resp, &err)
const blockSize = 4096
const fsBlocks = (1 << 50) / blockSize
resp.Blocks = fsBlocks // Total data blocks in file system.
resp.Bfree = fsBlocks // Free blocks in file system.
resp.Bavail = fsBlocks // Free blocks in file system if you're not root.
resp.Files = 1e9 // Total files in file system.
resp.Ffree = 1e9 // Free files in file system.
resp.Bsize = blockSize // Block size
resp.Namelen = 255 // Maximum file name length?
resp.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
total, used, free := f.VFS.Statfs()
if total >= 0 {
resp.Blocks = uint64(total) / blockSize
}
if used >= 0 {
resp.Bfree = resp.Blocks - uint64(used)/blockSize
}
if free >= 0 {
resp.Bavail = uint64(free) / blockSize
}
total, _, free := f.VFS.Statfs()
resp.Blocks = uint64(total) / blockSize // Total data blocks in file system.
resp.Bfree = uint64(free) / blockSize // Free blocks in file system.
resp.Bavail = resp.Bfree // Free blocks in file system if you're not root.
resp.Files = 1e9 // Total files in file system.
resp.Ffree = 1e9 // Free files in file system.
resp.Bsize = blockSize // Block size
resp.Namelen = 255 // Maximum file name length?
resp.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
mountlib.ClipBlocks(&resp.Blocks)
mountlib.ClipBlocks(&resp.Bfree)
mountlib.ClipBlocks(&resp.Bavail)

46
vfs/vfs.go
View File

@ -477,6 +477,37 @@ func (vfs *VFS) Rename(oldName, newName string) error {
return nil
}
// This works out the missing values from (total, used, free) using
// unknownFree as the intended free space
func fillInMissingSizes(total, used, free, unknownFree int64) (newTotal, newUsed, newFree int64) {
if total < 0 {
if free >= 0 {
total = free
} else {
total = unknownFree
}
if used >= 0 {
total += used
}
}
// total is now defined
if used < 0 {
if free >= 0 {
used = total - free
} else {
used = 0
}
}
// used is now defined
if free < 0 {
free = total - used
}
return total, used, free
}
// If the total size isn't known then we will aim for this many bytes free (1PB)
const unknownFreeBytes = 1 << 50
// Statfs returns into about the filing system if known
//
// The values will be -1 if they aren't known
@ -488,10 +519,7 @@ func (vfs *VFS) Statfs() (total, used, free int64) {
defer vfs.usageMu.Unlock()
total, used, free = -1, -1, -1
doAbout := vfs.f.Features().About
if doAbout == nil {
return
}
if vfs.usageTime.IsZero() || time.Since(vfs.usageTime) >= vfs.Opt.DirCacheTime {
if doAbout != nil && (vfs.usageTime.IsZero() || time.Since(vfs.usageTime) >= vfs.Opt.DirCacheTime) {
var err error
vfs.usage, err = doAbout(context.TODO())
vfs.usageTime = time.Now()
@ -510,15 +538,7 @@ func (vfs *VFS) Statfs() (total, used, free int64) {
if u.Used != nil {
used = *u.Used
}
if total < 0 && free >= 0 && used >= 0 {
total = free + used
}
if free < 0 && total >= 0 && used >= 0 {
free = total - used
}
if used < 0 && total >= 0 && free >= 0 {
used = total - free
}
}
total, used, free = fillInMissingSizes(total, used, free, unknownFreeBytes)
return
}

49
vfs/vfs_test.go
View File

@ -4,6 +4,7 @@ package vfs
import (
"context"
"fmt"
"io"
"os"
"testing"
@ -311,3 +312,51 @@ func TestVFSStatfs(t *testing.T) {
assert.Equal(t, free, free2)
assert.Equal(t, oldTime, vfs.usageTime)
}
func TestFillInMissingSizes(t *testing.T) {
const unknownFree = 10
for _, test := range []struct {
total, free, used int64
wantTotal, wantUsed, wantFree int64
}{
{
total: 20, free: 5, used: 15,
wantTotal: 20, wantFree: 5, wantUsed: 15,
},
{
total: 20, free: 5, used: -1,
wantTotal: 20, wantFree: 5, wantUsed: 15,
},
{
total: 20, free: -1, used: 15,
wantTotal: 20, wantFree: 5, wantUsed: 15,
},
{
total: 20, free: -1, used: -1,
wantTotal: 20, wantFree: 20, wantUsed: 0,
},
{
total: -1, free: 5, used: 15,
wantTotal: 20, wantFree: 5, wantUsed: 15,
},
{
total: -1, free: 15, used: -1,
wantTotal: 15, wantFree: 15, wantUsed: 0,
},
{
total: -1, free: -1, used: 15,
wantTotal: 25, wantFree: 10, wantUsed: 15,
},
{
total: -1, free: -1, used: -1,
wantTotal: 10, wantFree: 10, wantUsed: 0,
},
} {
t.Run(fmt.Sprintf("total=%d,free=%d,used=%d", test.total, test.free, test.used), func(t *testing.T) {
gotTotal, gotUsed, gotFree := fillInMissingSizes(test.total, test.used, test.free, unknownFree)
assert.Equal(t, test.wantTotal, gotTotal, "total")
assert.Equal(t, test.wantUsed, gotUsed, "used")
assert.Equal(t, test.wantFree, gotFree, "free")
})
}
}