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Message-ID: <20140218143005.GO26580@thunk.org> Date: Tue, 18 Feb 2014 09:30:05 -0500 From: Theodore Ts'o <tytso@....edu> To: Namjae Jeon <linkinjeon@...il.com> Cc: Lukáš Czerner <lczerner@...hat.com>, viro@...iv.linux.org.uk, david@...morbit.com, bpm@....com, adilger.kernel@...ger.ca, jack@...e.cz, mtk.manpages@...il.com, linux-fsdevel@...r.kernel.org, xfs@....sgi.com, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, Namjae Jeon <namjae.jeon@...sung.com>, Ashish Sangwan <a.sangwan@...sung.com> Subject: Re: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate Namjae, Did you respond to Matthew Wilcox's comments/question from Feb. 2nd? > > What if the file is mmaped at the time somebody issues this command? > > Seems to me we should drop pagecache pages that overlap with the > > removed blocks. If the removed range is not a multiple of PAGE_SIZE, > > then we should also drop any pagecache pages after the removed range. > > Oops, forgot to add "and if it is a multiple of page size, then we need > to update the offsets of any pages after the removed page". Dave responded that XFS does the right thing when doing a punch hole operation, but it wasn't obvious to me whether FL_COLLAPSE_RANGE does the right thing with ext4. Thanks, - Ted -- 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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