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Correctly capture and report disk space errors when writing files

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This commit is contained in:
Dane Everitt 2021-07-04 12:35:13 -07:00 committed by DaneEveritt
parent d8a7bf2dde
commit dfe5a77e0a
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GPG Key ID: EEA66103B3D71F53
2 changed files with 30 additions and 17 deletions
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36
server/filesystem/disk_space.go
View File

@ -80,24 +80,27 @@ func (fs *Filesystem) HasSpaceAvailable(allowStaleValue bool) bool {
return size <= fs.MaxDisk()
}
// Returns the cached value for the amount of disk space used by the filesystem. Do not rely on this
// function for critical logical checks. It should only be used in areas where the actual disk usage
// does not need to be perfect, e.g. API responses for server resource usage.
// CachedUsage returns the cached value for the amount of disk space used by the
// filesystem. Do not rely on this function for critical logical checks. It
// should only be used in areas where the actual disk usage does not need to be
// perfect, e.g. API responses for server resource usage.
func (fs *Filesystem) CachedUsage() int64 {
return atomic.LoadInt64(&fs.diskUsed)
}
// Internal helper function to allow other parts of the codebase to check the total used disk space
// as needed without overly taxing the system. This will prioritize the value from the cache to avoid
// excessive IO usage. We will only walk the filesystem and determine the size of the directory if there
// DiskUsage is an internal helper function to allow other parts of the codebase
// to check the total used disk space as needed without overly taxing the system.
// This will prioritize the value from the cache to avoid excessive IO usage. We
// will only walk the filesystem and determine the size of the directory if there
// is no longer a cached value.
//
// If "allowStaleValue" is set to true, a stale value MAY be returned to the caller if there is an
// expired cache value AND there is currently another lookup in progress. If there is no cached value but
// no other lookup is in progress, a fresh disk space response will be returned to the caller.
// If "allowStaleValue" is set to true, a stale value MAY be returned to the
// caller if there is an expired cache value AND there is currently another
// lookup in progress. If there is no cached value but no other lookup is in
// progress, a fresh disk space response will be returned to the caller.
//
// This is primarily to avoid a bunch of I/O operations from piling up on the server, especially on servers
// with a large amount of files.
// This is primarily to avoid a bunch of I/O operations from piling up on the
// server, especially on servers with a large amount of files.
func (fs *Filesystem) DiskUsage(allowStaleValue bool) (int64, error) {
// A disk check interval of 0 means this functionality is completely disabled.
if fs.diskCheckInterval == 0 {
@ -194,11 +197,14 @@ func (fs *Filesystem) DirectorySize(dir string) (int64, error) {
return size, errors.WrapIf(err, "server/filesystem: directorysize: failed to walk directory")
}
// Helper function to determine if a server has space available for a file of a given size.
// If space is available, no error will be returned, otherwise an ErrNotEnoughSpace error
// will be raised.
// HasSpaceFor is a function to determine if a server has space available for a
// file of a given size. If space is available, no error will be returned,
// otherwise an ErrNotEnoughSpace error will be raised. If this filesystem is
// configured as a virtual disk this function is a no-op as we will fall through
// to the native implementation to throw back an error if there is not disk
// space available.
func (fs *Filesystem) HasSpaceFor(size int64) error {
if fs.MaxDisk() == 0 {
if fs.IsVirtual() || fs.MaxDisk() == 0 {
return nil
}
s, err := fs.DiskUsage(true)

11
server/filesystem/filesystem.go
View File

@ -188,6 +188,12 @@ func (fs *Filesystem) Writefile(p string, r io.Reader) error {
buf := make([]byte, 1024*4)
sz, err := io.CopyBuffer(file, r, buf)
if err != nil {
if strings.Contains(err.Error(), "no space left on device") {
return newFilesystemError(ErrCodeDiskSpace, err)
}
return errors.WrapIf(err, "filesystem: failed to copy buffer for file write")
}
// Adjust the disk usage to account for the old size and the new size of the file.
fs.addDisk(sz - currentSize)
@ -345,8 +351,9 @@ func (fs *Filesystem) findCopySuffix(dir string, name string, extension string)
return name + suffix + extension, nil
}
// Copies a given file to the same location and appends a suffix to the file to indicate that
// it has been copied.
// Copy takes a given input file path and creates a copy of the file at the same
// location, appending a unique number to the end. For example, a copy of "test.txt"
// would create "test 2.txt" as the copy, then "test 3.txt" and so on.
func (fs *Filesystem) Copy(p string) error {
cleaned, err := fs.SafePath(p)
if err != nil {