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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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46
vfs/vfs.go
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@@ -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
}