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Message-ID: <20070626232649.GR31489@sgi.com> Date: Wed, 27 Jun 2007 09:26:49 +1000 From: David Chinner <dgc@....com> To: "Amit K. Arora" <aarora@...ux.vnet.ibm.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org, David Chinner <dgc@....com>, suparna@...ibm.com, cmm@...ibm.com, xfs@....sgi.com Subject: Re: [PATCH 4/7][TAKE5] support new modes in fallocate On Mon, Jun 25, 2007 at 03:52:39PM -0600, Andreas Dilger wrote: > On Jun 25, 2007 19:15 +0530, Amit K. Arora wrote: > > +#define FA_FL_DEALLOC 0x01 /* default is allocate */ > > +#define FA_FL_KEEP_SIZE 0x02 /* default is extend/shrink size */ > > +#define FA_FL_DEL_DATA 0x04 /* default is keep written data on DEALLOC */ > > In XFS one of the (many) ALLOC modes is to zero existing data on allocate. No, none of the XFS allocation modes do that. XFS_IOC_ALLOCSP, which does write zeros to disk, only allocates and writes zeros in the range between the old file size and the new file size. XFS_IOC_RESVSP, which alocates unwritten extents, only allocates where extents do not currently exist. It does not zero existing extents. IOWs, you can't overwrite existing data with XFS preallocation. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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