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Message-ID: <20081127045047.GF14101@mit.edu>
Date: Wed, 26 Nov 2008 23:50:47 -0500
From: Theodore Tso <tytso@....edu>
To: Solofo.Ramangalahy@...l.net
Cc: linux-ext4@...r.kernel.org
Subject: Re: [RFC 1/2] ext4 resize: Mark the added group with
EXT4_BG_INODE_ZEROED flag
On Fri, Nov 21, 2008 at 11:23:10AM +0100, Solofo.Ramangalahy@...l.net wrote:
> The inode table has been zeroed in setup_new_group_blocks().
> Mark it as such in ext4_group_add().
This patch makes sense to apply right away. However:
1) You didn't include a Developer's Certification of Origin (i.e., a
"Signed-off-by" header). Since this is a one line patch, and it seems
pretty clear your intention is to submit this to Linus, I added one on
your behalf so you can see how it should be done. However, in general
you should never add a signoff for someone else, so I need an explicit
OK from you that you agree with the terms of the Developer's
Certification of Origin as found in the Linux kernel source code,
Documentation/SubmittingPatches before I can push this patch to Linus.
This is very important legally.
2) You need to set the flag *before* you calculate the block group
checksum, not afterwards.
So the corrected patch should look like this....
- Ted
ext4: When resizing set the EXT4_BG_INODE_ZEROED flag for new block groups
From: Solofo.Ramangalahy@...l.net
The inode table has been zeroed in setup_new_group_blocks(). Mark it as
such in ext4_group_add(). Since we are currently clearing inode table
for the new block group, we should set the EXT4_BG_INODE_ZEROED flag.
If at some point in the future we don't immediately zero out the inode
table as part of the resize operation, then obviously we shouldn't do
this.
Signed-off-by: Solofo.Ramangalahy@...l.net
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index b6ec184..d448eb1 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -864,6 +864,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */
gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count);
gdp->bg_free_inodes_count = cpu_to_le16(EXT4_INODES_PER_GROUP(sb));
+ gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED);
gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
/*
--
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