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

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
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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) {