Package filealloc

This package offers space-management of os.File-like entities.

Each allocation is broken down to a set of simple, atomic steps, so that the file does not get corrupted, if the process or system crashes during an allocation or deallocation.

var EDoubleFree = fmt.Errorf("Warning: Double Free")

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var EInternalError = fmt.Errorf("Invalid Offset")

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var EInvalidOffset = fmt.Errorf("Invalid Offset")

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func LL_getRawSizeForRank(i uint) int

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type Allocator struct {
	// contains filtered or unexported fields
}

Allocator manages allocation of file blocks within a File.

Allocator methods are not safe for concurrent use by multiple goroutines. Callers must provide their own synchronization whan it's used concurrently by multiple goroutines.

func NewAllocator(f File) (*Allocator, error)

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func (a *Allocator) Alloc(size int, noGrow bool) (int64, error)

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func (a *Allocator) ApproxFreeSpace() (total int64)

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func (a *Allocator) ApproxFreeSpaceFor(minSize int) (total int64)

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func (a *Allocator) FileSize() int64

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func (a *Allocator) Free(off int64) error

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func (a *Allocator) LL_getRanks() [30]int64

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func (a *Allocator) UsableSize(off int64) (int, error)

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type File interface {
	Close() error
	ReadAt(p []byte, off int64) (n int, err error)
	Stat() (os.FileInfo, error)
	Sync() error
	Truncate(int64) error
	WriteAt(p []byte, off int64) (n int, err error)
}

*os.File