[PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Wang Shilong]

From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>

It can be guranteed that inode->i_sb should not be null in vfs.
So here the check about it is overhead.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
---

sorry about wrong format patch， i will resend it later.

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Re: [PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Zheng Liu]

On Wed, Feb 06, 2013 at 12:22:47PM -0800, Wang Shilong wrote:
> From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
> 
> It can be guranteed that inode->i_sb should not be null in vfs.
> So here the check about it is overhead.
> 
> Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
> ---
> 
> sorry about wrong format patch， i will resend it later.

Hi Shilong,

If you want to re-send a patch series, add [RESEND] in subject, please.
Because it could make us know which is the latest one. :-)

Regards,
                                                - Zheng
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Re: [PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Theodore Ts'o]

On Wed, Feb 06, 2013 at 02:56:46PM +0800, Zheng Liu wrote:
> 
> If you want to re-send a patch series, add [RESEND] in subject, please.
> Because it could make us know which is the latest one. :-)

Ideally, use RESEND if you haven't changed the patch series since the
last time you've sent it.  If you have changed it, please use [PATCH
v2], [PATCH v3], etc.

Thanks,

						- Ted

Re: [PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[shilong wang]

2013/2/7 Theodore Ts'o <tytso@mit.edu>:
> On Wed, Feb 06, 2013 at 02:56:46PM +0800, Zheng Liu wrote:
>>
>> If you want to re-send a patch series, add [RESEND] in subject, please.
>> Because it could make us know which is the latest one. :-)
>
> Ideally, use RESEND if you haven't changed the patch series since the
> last time you've sent it.  If you have changed it, please use [PATCH
> v2], [PATCH v3], etc.

I get it..
Thanks, thanks every one  for teaching me so much...

Now i am trying to do something for ext4 development in my leisure time..
Since i don't know anything about filesystem before.. i have to study
about it from minix to ext2..ext3..ext4..btrfs..

However, it still seems a little hard for me to figure everything out
just by reading code... So i wonder where i can get
some papers or articles about the new concept of filesystems.. for
example extent management or something else for ext4..etc
Maybe it helps a lot for me...

Thanks,
Wang

>
> Thanks,
>
>                                                 - Ted

Re: [PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Zheng Liu]

On Thu, Feb 07, 2013 at 11:22:21PM +0800, shilong wang wrote:
> 2013/2/7 Theodore Ts'o <tytso@mit.edu>:
> > On Wed, Feb 06, 2013 at 02:56:46PM +0800, Zheng Liu wrote:
> >>
> >> If you want to re-send a patch series, add [RESEND] in subject, please.
> >> Because it could make us know which is the latest one. :-)
> >
> > Ideally, use RESEND if you haven't changed the patch series since the
> > last time you've sent it.  If you have changed it, please use [PATCH
> > v2], [PATCH v3], etc.
> 
> I get it..
> Thanks, thanks every one  for teaching me so much...
> 
> Now i am trying to do something for ext4 development in my leisure time..
> Since i don't know anything about filesystem before.. i have to study
> about it from minix to ext2..ext3..ext4..btrfs..
> 
> However, it still seems a little hard for me to figure everything out
> just by reading code... So i wonder where i can get
> some papers or articles about the new concept of filesystems.. for
> example extent management or something else for ext4..etc
> Maybe it helps a lot for me...

This link (https://ext4.wiki.kernel.org/index.php/Main_Page) might be
useful for you.

Regards,
                                                - Zheng

[PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Wang Shilong]

From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>

It can be guranteed that inode->i_sb should not be null in vfs.
So here the check about it is overhead.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
---
fs/ext2/balloc.c | 4 ----
1 file changed, 4 deletions(-)

diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 1c36139..22993a0 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1239,10 +1239,6 @@ ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,

*errp = -ENOSPC;
sb = inode->i_sb;
- if (!sb) {
- printk("ext2_new_blocks: nonexistent device");
- return 0;
- }

/*
* Check quota for allocation of this block.
-- 
1.7.11.7

[PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Wang shilong]

From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>

It can be guranteed that inode->i_sb should not be null in vfs.
So here the check about it is overhead.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
---
 fs/ext2/balloc.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 1c36139..22993a0 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1239,10 +1239,6 @@ ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,
 
 	*errp = -ENOSPC;
 	sb = inode->i_sb;
-	if (!sb) {
-		printk("ext2_new_blocks: nonexistent device");
-		return 0;
-	}
 
 	/*
 	 * Check quota for allocation of this block.
-- 
1.7.11.7

Re: [PATCH 1/3] Ext2: remove the overhead check about sb in the function ext2_new_blocks

[Jan Kara]

On Wed 06-02-13 14:14:26, Wang shilong wrote:
> From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
> 
> It can be guranteed that inode->i_sb should not be null in vfs.
> So here the check about it is overhead.
  This patch looks good. I've added it to my tree.

								Honza
> 
> Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
> ---
>  fs/ext2/balloc.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
> index 1c36139..22993a0 100644
> --- a/fs/ext2/balloc.c
> +++ b/fs/ext2/balloc.c
> @@ -1239,10 +1239,6 @@ ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,
>  
>  	*errp = -ENOSPC;
>  	sb = inode->i_sb;
> -	if (!sb) {
> -		printk("ext2_new_blocks: nonexistent device");
> -		return 0;
> -	}
>  
>  	/*
>  	 * Check quota for allocation of this block.
> -- 
> 1.7.11.7
> 
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR