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Re: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for f

To: "Theodore Ts'o" <tytso@xxxxxxx>
Subject: Re: [PATCH RESEND 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate
From: Namjae Jeon <linkinjeon@xxxxxxxxx>
Date: Wed, 19 Feb 2014 10:08:39 +0900
Cc: Namjae Jeon <linkinjeon@xxxxxxxxx>, LukÃÅ Czerner <lczerner@xxxxxxxxxx>, viro@xxxxxxxxxxxxxxxxxx, david@xxxxxxxxxxxxx, bpm@xxxxxxx, adilger.kernel@xxxxxxxxx, jack@xxxxxxx, mtk.manpages@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Namjae Jeon <namjae.jeon@xxxxxxxxxxx>, Ashish Sangwan <a.sangwan@xxxxxxxxxxx>
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References: <1391319874-3203-1-git-send-email-linkinjeon@xxxxxxxxx> <alpine.LFD.2.00.1402111209450.2225@xxxxxxxxxxxxxxxxxxxxx> <CAKYAXd-bD6ZZgpc9E8V1kD9Dj2wrCkbi1i6drNBdUAwsMiv5gg@xxxxxxxxxxxxxx> <alpine.LFD.2.00.1402181001530.2216@xxxxxxxxxxxxxxxxxxxxx> <CAKYAXd_xpWg-=T_1PghL_u9wDKTX_Ey5mJxbgVVKth8NoexQQg@xxxxxxxxxxxxxx> <20140218143005.GO26580@xxxxxxxxx>
2014-02-18 23:30 GMT+09:00, Theodore Ts'o <tytso@xxxxxxx>:
> Namjae,
Hi Ted.
>
> Did you respond to Matthew Wilcox's comments/question from Feb. 2nd?
Sorry, I didn't catch about this.
I just replied from Matthew's mail.
Thanks for your remind.
>
>> > 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
>

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