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vfs: add --vfs-writeback option to delay writes back to cloud storage

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This is enabled by default and can be disabled with --vfs-writeback 0
This commit is contained in:
Nick Craig-Wood
2020-04-17 11:18:58 +01:00
parent 28255f1bac
commit e4e53a2e61
19 changed files with 958 additions and 385 deletions
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4
vfs/read_write.go
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@@ -36,7 +36,7 @@ func newRWFileHandle(d *Dir, f *File, flags int) (fh *RWFileHandle, err error) {
// get an item to represent this from the cache
item := d.vfs.cache.Item(f.Path())
exists := f.exists() // || item.Exists()
exists := f.exists() || item.Exists()
// if O_CREATE and O_EXCL are set and if path already exists, then return EEXIST
if flags&(os.O_CREATE|os.O_EXCL) == os.O_CREATE|os.O_EXCL && exists {
@@ -51,7 +51,7 @@ func newRWFileHandle(d *Dir, f *File, flags int) (fh *RWFileHandle, err error) {
}
// truncate immediately if O_TRUNC is set or O_CREATE is set and file doesn't exist
if !fh.readOnly() && (fh.flags&os.O_TRUNC != 0 || (fh.flags&os.O_CREATE != 0 && !(exists || item.Exists()))) {
if !fh.readOnly() && (fh.flags&os.O_TRUNC != 0 || (fh.flags&os.O_CREATE != 0 && !exists)) {
err = fh.Truncate(0)
if err != nil {
return nil, errors.Wrap(err, "cache open with O_TRUNC: failed to truncate")