Bug 163994

Summary:	sparse files not handled efficiently
Product:	[Fedora] Fedora	Reporter:	Neal Becker <ndbecker2>
Component:	star	Assignee:	Peter Vrabec <pvrabec>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4	CC:	schily
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-09-06 12:13:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Neal Becker 2005-07-22 18:14:51 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.1 (like Gecko)

Description of problem:
According to my reading of star manpage, -sparse only works efficiently on 
solaris. 
 
The following algorithm is used for cp, tar, rdist IIRC: 
 
#if POSIX 
if (st.blocksize*st.blocks < st.size): 
  file is sparse 

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.star -c -sparse 
2. 
3. 
   

Additional info:

Comment 1 Peter Vrabec 2005-09-06 11:54:18 UTC

I'm sorry, what u complain about?

Comment 2 Neal Becker 2005-09-06 11:57:11 UTC

Never mind.

Comment 3 Jörg Schilling 2009-01-25 13:01:08 UTC

Even on Linux, star handles sparse files more efficiently than
GNU tar.

If you are interested on a correct and more efficient sparse file
support on Linux, I recommend you to implement the lseek SEEK_HOLE/SEEK_DATA
interface that Solaris introduced for star.