hardcoresushi/libgocryptfs
1
0
Fork 0
Code Issues Pull Requests Releases Activity

fuserfrontend: support truncate(2) by wrapping ftruncate(2)

Browse Source 
Support truncate(2) by opening the file and calling ftruncate(2)
While the glibc "truncate" wrapper seems to always use ftruncate, fsstress from
xfstests uses this a lot by calling "truncate64" directly.
This commit is contained in:
Jakob Unterwurzacher 2016-06-26 18:35:19 +02:00
parent 1de5ceed58
commit 38767ab527
2 changed files with 12 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
internal/fusefrontend/file.go
View File

@ -489,6 +489,8 @@ func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
var allocateWarnOnce sync.Once
// Allocate - FUSE call, fallocate(2)
// This is not implemented yet in gocryptfs, but it is neither in EncFS. This
// suggests that the user demand is low.
func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
allocateWarnOnce.Do(func() {
tlog.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")

17
internal/fusefrontend/fs.go
View File

@ -207,14 +207,17 @@ func (fs *FS) Mknod(path string, mode uint32, dev uint32, context *fuse.Context)
return fs.FileSystem.Mknod(cPath, mode, dev, context)
}
// Only warn once
var truncateWarnOnce sync.Once
// Support truncate(2) by opening the file and calling ftruncate(2)
// While the glibc "truncate" wrapper seems to always use ftruncate, fsstress from
// xfstests uses this a lot by calling "truncate64" directly.
func (fs *FS) Truncate(path string, offset uint64, context *fuse.Context) (code fuse.Status) {
truncateWarnOnce.Do(func() {
tlog.Warn.Printf("truncate(2) is not supported, returning ENOSYS - use ftruncate(2)")
})
return fuse.ENOSYS
file, code := fs.Open(path, uint32(os.O_RDWR), context)
if code != fuse.OK {
return code
}
code = file.Truncate(offset)
file.Release()
return code
}
func (fs *FS) Utimens(path string, Atime *time.Time, Mtime *time.Time, context *fuse.Context) (code fuse.Status) {