Bug 222816 - RFE: Update gfs2's ordered write mode to not use buffer heads
RFE: Update gfs2's ordered write mode to not use buffer heads
Product: Fedora
Classification: Fedora
Component: GFS-kernel (Show other bugs)
All Linux
low Severity medium
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Assigned To: Steve Whitehouse
: FutureFeature
Depends On:
Blocks: 329321
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Reported: 2007-01-16 07:05 EST by Steve Whitehouse
Modified: 2013-02-25 06:38 EST (History)
1 user (show)

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Doc Type: Enhancement
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Last Closed: 2013-02-25 06:38:30 EST
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Description Steve Whitehouse 2007-01-16 07:05:56 EST
It should be possible to avoid the user of buffer heads in the ordered write
mode by tagging each transaction and/or inode to indicate which page range(s)
need writing back at journal flush time. It might also be ok to just writeback
all dirty data for the inode in question without too much of a performance hit
since we'll only be doing it on a journal flush.

Either way it has two desirable properties: (1) we'd be able to move
gfs2_writepages() for ordered write files to use mpage_writepages() as per the
data=writeback mode and (2) we'd be able to get rid of all the ordered write
special casing in the databuf_ functions in lops.c which would considerably
simplify that code.

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