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1. clearing 'flag unwritten extents' (score: 1): Author: Roger Willcocks <willcor@xxxxxxxxx>; Date: Thu, 10 Nov 2005 19:11:32 +0000; xfs_db has an option (version extflg) for setting the 'flag unwritten extents' bit in the superblock(s), but no way of clearing it. Is this deliberate? -- Roger; /archives/xfs/2005-11/msg00055.html (7,711 bytes)
2. Re: clearing 'flag unwritten extents' (score: 1): Author: Nathan Scott <nathans@xxxxxxx>; Date: Fri, 11 Nov 2005 07:34:35 +1100; Yes, once set unwritten extents may have been used, and there's no going back at that point. cheers. -- Nathan; /archives/xfs/2005-11/msg00056.html (8,255 bytes)
3. Re: clearing 'flag unwritten extents' (score: 1): Author: Roger Willcocks <willcor@xxxxxxxxx>; Date: Fri, 11 Nov 2005 12:48:48 +0000; I'd like to understand this a bit more - is this a security issue or an architectural one? AIUI, the 'flag unwritten extents' option allows non-root users to preallocate unwritten extents (root can; /archives/xfs/2005-11/msg00065.html (9,511 bytes)
4. Re: clearing 'flag unwritten extents' (score: 1): Author: Nathan Scott <nathans@xxxxxxx>; Date: Mon, 14 Nov 2005 09:13:37 +1100; It does more than just that - in xfs_bmapi it changes the way extents are handled - look for XFS_SB_VERSION_HASEXTFLGBIT in xfs_bmap.c in particular. cheers. -- Nathan; /archives/xfs/2005-11/msg00068.html (8,683 bytes)
5. Re: clearing 'flag unwritten extents' (score: 1): Author: Roger Willcocks <willcor@xxxxxxxxx>; Date: Tue, 15 Nov 2005 15:13:19 +0000; But only for realtime extents - and I don't have any of those... -- Roger; /archives/xfs/2005-11/msg00073.html (9,364 bytes)
6. Re: clearing 'flag unwritten extents' (score: 1): Author: Steve Lord <lord@xxxxxxx>; Date: Tue, 15 Nov 2005 09:25:18 -0600; Roger Willcocks wrote: On 11/13/05, Nathan Scott <nathans@xxxxxxx> wrote: On Fri, Nov 11, 2005 at 12:48:48PM +0000, Roger Willcocks wrote: AIUI, the 'flag unwritten extents' option allows non-root us; /archives/xfs/2005-11/msg00074.html (9,746 bytes)
7. Re: clearing 'flag unwritten extents' (score: 1): Author: Nathan Scott <nathans@xxxxxxx>; Date: Wed, 16 Nov 2005 08:06:06 +1100; Not only realtime - look more closely in xfs_bmapi(). *nod*. They are a Good Thing (tm), although the current code implementing them on Linux is pretty horrible - that will get alot better in the not; /archives/xfs/2005-11/msg00076.html (9,938 bytes)
8. clearing 'flag unwritten extents' (score: 1): Author: Roger Willcocks <willcor@xxxxxxxxx>; Date: Thu, 10 Nov 2005 19:11:32 +0000; xfs_db has an option (version extflg) for setting the 'flag unwritten extents' bit in the superblock(s), but no way of clearing it. Is this deliberate? -- Roger; /archives/xfs/2005-11/msg00210.html (7,711 bytes)
9. Re: clearing 'flag unwritten extents' (score: 1): Author: Nathan Scott <nathans@xxxxxxx>; Date: Fri, 11 Nov 2005 07:34:35 +1100; Yes, once set unwritten extents may have been used, and there's no going back at that point. cheers. -- Nathan; /archives/xfs/2005-11/msg00211.html (8,255 bytes)
10. Re: clearing 'flag unwritten extents' (score: 1): Author: Roger Willcocks <willcor@xxxxxxxxx>; Date: Fri, 11 Nov 2005 12:48:48 +0000; I'd like to understand this a bit more - is this a security issue or an architectural one? AIUI, the 'flag unwritten extents' option allows non-root users to preallocate unwritten extents (root can; /archives/xfs/2005-11/msg00220.html (9,511 bytes)
11. Re: clearing 'flag unwritten extents' (score: 1): Author: Nathan Scott <nathans@xxxxxxx>; Date: Mon, 14 Nov 2005 09:13:37 +1100; It does more than just that - in xfs_bmapi it changes the way extents are handled - look for XFS_SB_VERSION_HASEXTFLGBIT in xfs_bmap.c in particular. cheers. -- Nathan; /archives/xfs/2005-11/msg00223.html (8,683 bytes)
12. Re: clearing 'flag unwritten extents' (score: 1): Author: Roger Willcocks <willcor@xxxxxxxxx>; Date: Tue, 15 Nov 2005 15:13:19 +0000; But only for realtime extents - and I don't have any of those... -- Roger; /archives/xfs/2005-11/msg00228.html (9,364 bytes)
13. Re: clearing 'flag unwritten extents' (score: 1): Author: Steve Lord <lord@xxxxxxx>; Date: Tue, 15 Nov 2005 09:25:18 -0600; Roger Willcocks wrote: On 11/13/05, Nathan Scott <nathans@xxxxxxx> wrote: On Fri, Nov 11, 2005 at 12:48:48PM +0000, Roger Willcocks wrote: AIUI, the 'flag unwritten extents' option allows non-root us; /archives/xfs/2005-11/msg00229.html (9,746 bytes)
14. Re: clearing 'flag unwritten extents' (score: 1): Author: Nathan Scott <nathans@xxxxxxx>; Date: Wed, 16 Nov 2005 08:06:06 +1100; Not only realtime - look more closely in xfs_bmapi(). *nod*. They are a Good Thing (tm), although the current code implementing them on Linux is pretty horrible - that will get alot better in the not; /archives/xfs/2005-11/msg00231.html (9,938 bytes)

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