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Message-ID: <20130801002341.GI7118@dastard> Date: Thu, 1 Aug 2013 10:23:41 +1000 From: Dave Chinner <david@...morbit.com> To: Theodore Ts'o <tytso@....edu>, Namjae Jeon <linkinjeon@...il.com>, adilger.kernel@...ger.ca, bpm@....com, elder@...nel.org, hch@...radead.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org, xfs@....sgi.com, a.sangwan@...sung.com, Namjae Jeon <namjae.jeon@...sung.com> Subject: Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE On Wed, Jul 31, 2013 at 06:01:54PM -0400, Theodore Ts'o wrote: > Have you considered what happens if you have a 10 megabyte file, of > which the first 5 megs are mmap'ed into a userspace process. > > Now suppose you call COLLAPASE_RANGE on a one megabyte range starting > at offset 1024k from the beginning of the file. > > Does the right thing happen to the mmap'ed region in memory? Implementation detail. like a hole punch, it needs to invalidate the range that it is operating over so mmap()d regions are refaulted after the operation is done. Cheers, Dave. -- Dave Chinner david@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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