On Wed, Mar 01, 2017 at 11:13:43AM +0800, Su Yue wrote:
> It can be feched from my github:
> https://github.com/Damenly/btrfs-progs.git lowmem_repair
>
> This patchset can repair errors found in fs tree in lowmem mode.
>
> This patchset request includes:
> 1) Repair inode nbytes error.
> 2) Repair dir isize error.
> 3) Repair orpahan inode item.
> 4) Repair dir item/index missing/mismatch.
> 5) Repair inode ref missing/mismatch.
> 6) Repair inode item missing.
> 7) Repair inode nlink error.
> 8) Punch file extent hole.
> 9) Let test-fsck test cases which can be repaired in lowmem mode.
I went through the patchset. At this point it's not close to being
merged. Check and especially repair is IMO an area that deserves more
than just a few lines in the changelog. It should really explain why the
change is correct, what corruptions is it able to repair etc. And the
changelog does not need to repeat the subject line or say what the name
of the new function is. I want to know that you understand what code are
you changing, also helping me to navigate through it as I (or somebody
else) review it. I don't think that repair is the first project one
should attempt in btrfs-progs, but I guess you get advice from Qu.
I saw many small typos or formatting glitches that it started bothering
me. You seem to format arguments at the column of the opening "(" which
looks when it's near the end of line:
+ ret = repair_dir_isize_lowmem(root, path,
+ inode_id,
+ size);
+
+ ret = repair_inode_nlinks_lowmem(root, path,
+ inode_id,
+ namebuf, name_len,
+ refs,
+ imode_to_type(mode),
+ &nlink);
+ ret = repair_inode_nlinks_lowmem(root,
+ path,
+ inode_id,
+ namebuf,
+ name_len,
+ refs,
+
imode_to_type(mode),
+ &nlink);
There's a "prior art" should serve as a deterrent example for anybody using
this style, the infamous balance_leaf from reiserfs, before it was heavily
cleaned up by Jeff:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/reiserfs/do_balan.c?id=60f76eab19e3903e810bdc3ec846c158efcd2e21#n460
Scroll around the file to get the idea what scares me. Arguments can be packed
on next lines indented by one or two tabs. I don't bother to change that where
it does not hurt too much.
Please update the subjects, drop the file name and use just
"btrfs-progs: check: ..." .
We can schedule the changes for 4.12 release, but please start smaller this
time and pick just say 3 fixes so we can work through the preferred style
and quality level so you don't need to update 20 patches each time.
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