Patchwork ext4: ext4_dx_add_entry should dirty directory metadata with the directory inode

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Submitter Darrick J. Wong
Date Aug. 11, 2011, 9:15 p.m.
Message ID <20110811211513.GL20655@tux1.beaverton.ibm.com>
Download mbox | patch
Permalink /patch/109687/
State Accepted
Headers show

Comments

Darrick J. Wong - Aug. 11, 2011, 9:15 p.m.
ext4_dx_add_entry manipulates bh2 and frames[0].bh, which are two buffer_heads
that point to directory blocks assigned to the directory inode.  However, the
function calls ext4_handle_dirty_metadata with the inode of the file that's
being added to the directory, not the directory inode itself.  Therefore,
correct the code to dirty the directory buffers with the directory inode, not
the file inode.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---

 fs/ext4/namei.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

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Andreas Dilger - Aug. 11, 2011, 9:41 p.m.
On 2011-08-11, at 3:15 PM, Darrick J. Wong wrote:
> ext4_dx_add_entry manipulates bh2 and frames[0].bh, which are two buffer_heads
> that point to directory blocks assigned to the directory inode.  However, the
> function calls ext4_handle_dirty_metadata with the inode of the file that's
> being added to the directory, not the directory inode itself.  Therefore,
> correct the code to dirty the directory buffers with the directory inode, not
> the file inode.

Interesting.  For journaled filesystems this is purely cosmetic, since
"handle" is valid and "inode" is unused in that case.  For non-journal
filesystems it actually affects the correctness, since this buffer may
not be sync'd to disk even when the directory is marked "dirsync".

You can add my:
Reviewed-by: Andreas Dilger <adilger@dilger.ca>

> Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
> ---
> 
> fs/ext4/namei.c |    4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index b754b77..79ddc43 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1589,7 +1589,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
> 			dxtrace(dx_show_index("node", frames[1].entries));
> 			dxtrace(dx_show_index("node",
> 			       ((struct dx_node *) bh2->b_data)->entries));
> -			err = ext4_handle_dirty_metadata(handle, inode, bh2);
> +			err = ext4_handle_dirty_metadata(handle, dir, bh2);
> 			if (err)
> 				goto journal_error;
> 			brelse (bh2);
> @@ -1615,7 +1615,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
> 			if (err)
> 				goto journal_error;
> 		}
> -		err = ext4_handle_dirty_metadata(handle, inode, frames[0].bh);
> +		err = ext4_handle_dirty_metadata(handle, dir, frames[0].bh);
> 		if (err) {
> 			ext4_std_error(inode->i_sb, err);
> 			goto cleanup;
> --
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Cheers, Andreas





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Darrick J. Wong - Sept. 30, 2011, 7:44 p.m.
On Thu, Aug 11, 2011 at 03:41:59PM -0600, Andreas Dilger wrote:
> On 2011-08-11, at 3:15 PM, Darrick J. Wong wrote:
> > ext4_dx_add_entry manipulates bh2 and frames[0].bh, which are two buffer_heads
> > that point to directory blocks assigned to the directory inode.  However, the
> > function calls ext4_handle_dirty_metadata with the inode of the file that's
> > being added to the directory, not the directory inode itself.  Therefore,
> > correct the code to dirty the directory buffers with the directory inode, not
> > the file inode.
> 
> Interesting.  For journaled filesystems this is purely cosmetic, since
> "handle" is valid and "inode" is unused in that case.  For non-journal
> filesystems it actually affects the correctness, since this buffer may
> not be sync'd to disk even when the directory is marked "dirsync".
> 
> You can add my:
> Reviewed-by: Andreas Dilger <adilger@dilger.ca>

Hm.... any thoughts, Ted?  Will this be picked up for 3.1/3.2?

--D
> 
> > Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
> > ---
> > 
> > fs/ext4/namei.c |    4 ++--
> > 1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> > index b754b77..79ddc43 100644
> > --- a/fs/ext4/namei.c
> > +++ b/fs/ext4/namei.c
> > @@ -1589,7 +1589,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
> > 			dxtrace(dx_show_index("node", frames[1].entries));
> > 			dxtrace(dx_show_index("node",
> > 			       ((struct dx_node *) bh2->b_data)->entries));
> > -			err = ext4_handle_dirty_metadata(handle, inode, bh2);
> > +			err = ext4_handle_dirty_metadata(handle, dir, bh2);
> > 			if (err)
> > 				goto journal_error;
> > 			brelse (bh2);
> > @@ -1615,7 +1615,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
> > 			if (err)
> > 				goto journal_error;
> > 		}
> > -		err = ext4_handle_dirty_metadata(handle, inode, frames[0].bh);
> > +		err = ext4_handle_dirty_metadata(handle, dir, frames[0].bh);
> > 		if (err) {
> > 			ext4_std_error(inode->i_sb, err);
> > 			goto cleanup;
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 
> Cheers, Andreas
> 
> 
> 
> 
> 
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Patch

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index b754b77..79ddc43 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1589,7 +1589,7 @@  static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
 			dxtrace(dx_show_index("node", frames[1].entries));
 			dxtrace(dx_show_index("node",
 			       ((struct dx_node *) bh2->b_data)->entries));
-			err = ext4_handle_dirty_metadata(handle, inode, bh2);
+			err = ext4_handle_dirty_metadata(handle, dir, bh2);
 			if (err)
 				goto journal_error;
 			brelse (bh2);
@@ -1615,7 +1615,7 @@  static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
 			if (err)
 				goto journal_error;
 		}
-		err = ext4_handle_dirty_metadata(handle, inode, frames[0].bh);
+		err = ext4_handle_dirty_metadata(handle, dir, frames[0].bh);
 		if (err) {
 			ext4_std_error(inode->i_sb, err);
 			goto cleanup;