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Re: Mails sent to the XFS mailing list

To: Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: Mails sent to the XFS mailing list
From: Somdeep Dey <somdeepdey10@xxxxxxxxx>
Date: Mon, 16 Feb 2015 19:50:50 +0530
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Hi Dave,

We have sent a RFD mail on the mailing list about the current task that we
are doing: defragmenting parts of a file. (Haven't got a response yet)


We were actually stuck on a logical aspect, of how to go ahead performing
defragmentation without creating a temporary file, and then copy extents to it.


File: fsr/xfs_fsr.c

In fsr/xfs_fsr.c code , we also had a doubt about how to modify the number of
extents for the temp file getting created.

Line 1321 onwards:
It would be of great help if u could shed some light on the ioctl's -

We took a test case where a file had 3 extents. The for loop at line 1321 now
had nextents value as 1 (i.e ideal extent count 1) and
outmap[extent].bmv_length was addition of all blocks, i.e. outmap[ ] array had
one index (for 1 ideal extent)

After that we tried running a defragmentation test, by making read_fd_bmap()
function return nextents value as 2, and subsequently made outmap[ ] have
two entries instead of one.

However the temp file that got created (Line 1321 onwards) still had
as 1 (Line 1382) instead of having 2.
Any thoughts ? :)


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