Re: [GFS2] Shrink gfs2_inode (5) - di_nlink [25/70]

[Russell Cattelan <cattelan@thebarn.com>]

On Thu, 2006-11-30 at 12:16 +0000, Steven Whitehouse wrote:
> >From 4f56110a00af5fb2e22fbccfcaf944d62cae8fcf Mon Sep 17 00:00:00 2001
> From: Steven Whitehouse <swhiteho@redhat.com>
> Date: Wed, 1 Nov 2006 14:04:17 -0500
> Subject: [PATCH] [GFS2] Shrink gfs2_inode (5) - di_nlink
> 
> Remove the di_nlink field in favour of inode->i_nlink and
> update the nlink handling to use the proper macros. This
> saves 4 bytes.

This patch seems like is one in a bigger series of patches
that should be done all at once?

While creating a patches on a per field basis is good
having partial changes checked in like this is confusing.
Since now the use of data structures is inconsistent.

What do -1 and -2 represent? I assume that is a special
state or the inode? maybe some comments or use of 
descriptive macros.


> 
> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
> ---
>  fs/gfs2/inode.c             |   37 ++++++++++++++++++++++++-------------
>  fs/gfs2/ondisk.c            |    3 +--
>  fs/gfs2/ops_inode.c         |   12 ++++++------
>  include/linux/gfs2_ondisk.h |    1 -
>  4 files changed, 31 insertions(+), 22 deletions(-)
> 
> diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
> index 0de9b22..7112039 100644
> --- a/fs/gfs2/inode.c
> +++ b/fs/gfs2/inode.c
> @@ -51,7 +51,6 @@ void gfs2_inode_attr_in(struct gfs2_inod
>  	struct gfs2_dinode_host *di = &ip->i_di;
>  
>  	inode->i_ino = ip->i_num.no_addr;
> -	inode->i_nlink = di->di_nlink;
>  	i_size_write(inode, di->di_size);
>  	inode->i_atime.tv_sec = di->di_atime;
>  	inode->i_mtime.tv_sec = di->di_mtime;
> @@ -214,7 +213,12 @@ static int gfs2_dinode_in(struct gfs2_in
>  
>  	ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
>  	ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
> -	di->di_nlink = be32_to_cpu(str->di_nlink);
> +	/*
> +	 * We will need to review setting the nlink count here in the
> +	 * light of the forthcoming ro bind mount work. This is a reminder
> +	 * to do that.
> +	 */
> +	ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
>  	di->di_size = be64_to_cpu(str->di_size);
>  	di->di_blocks = be64_to_cpu(str->di_blocks);
>  	di->di_atime = be64_to_cpu(str->di_atime);
> @@ -336,12 +340,12 @@ int gfs2_change_nlink(struct gfs2_inode 
>  	u32 nlink;
>  	int error;
>  
> -	BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
> -	nlink = ip->i_di.di_nlink + diff;
> +	BUG_ON(diff != 1 && diff != -1);
> +	nlink = ip->i_inode.i_nlink + diff;
>  
>  	/* If we are reducing the nlink count, but the new value ends up being
>  	   bigger than the old one, we must have underflowed. */
> -	if (diff < 0 && nlink > ip->i_di.di_nlink) {
> +	if (diff < 0 && nlink > ip->i_inode.i_nlink) {
>  		if (gfs2_consist_inode(ip))
>  			gfs2_dinode_print(ip);
>  		return -EIO;
> @@ -351,16 +355,19 @@ int gfs2_change_nlink(struct gfs2_inode 
>  	if (error)
>  		return error;
>  
> -	ip->i_di.di_nlink = nlink;
> +	if (diff > 0)
> +		inc_nlink(&ip->i_inode);
> +	else
> +		drop_nlink(&ip->i_inode);
> +
>  	ip->i_di.di_ctime = get_seconds();
> -	ip->i_inode.i_nlink = nlink;
>  
>  	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
>  	gfs2_dinode_out(ip, dibh->b_data);
>  	brelse(dibh);
>  	mark_inode_dirty(&ip->i_inode);
>  
> -	if (ip->i_di.di_nlink == 0) {
> +	if (ip->i_inode.i_nlink == 0) {
>  		struct gfs2_rgrpd *rgd;
>  		struct gfs2_holder ri_gh, rg_gh;
>  
> @@ -375,7 +382,6 @@ int gfs2_change_nlink(struct gfs2_inode 
>  		if (error)
>  			goto out_norgrp;
>  
> -		clear_nlink(&ip->i_inode);
>  		gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
>  		gfs2_glock_dq_uninit(&rg_gh);
>  out_norgrp:
> @@ -586,7 +592,7 @@ static int create_ok(struct gfs2_inode *
>  		return error;
>  
>  	/*  Don't create entries in an unlinked directory  */
> -	if (!dip->i_di.di_nlink)
> +	if (!dip->i_inode.i_nlink)
>  		return -EPERM;
>  
>  	error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
> @@ -602,7 +608,7 @@ static int create_ok(struct gfs2_inode *
>  
>  	if (dip->i_di.di_entries == (u32)-1)
>  		return -EFBIG;
> -	if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
> +	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
>  		return -EMLINK;
>  
>  	return 0;
> @@ -808,7 +814,7 @@ static int link_dinode(struct gfs2_inode
>  	error = gfs2_meta_inode_buffer(ip, &dibh);
>  	if (error)
>  		goto fail_end_trans;
> -	ip->i_di.di_nlink = 1;
> +	ip->i_inode.i_nlink = 1;
>  	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
>  	gfs2_dinode_out(ip, dibh->b_data);
>  	brelse(dibh);
> @@ -1016,7 +1022,12 @@ int gfs2_rmdiri(struct gfs2_inode *dip, 
>  	if (error)
>  		return error;
>  
> -	error = gfs2_change_nlink(ip, -2);
> +	/* It looks odd, but it really should be done twice */
> +	error = gfs2_change_nlink(ip, -1);
> +	if (error)
> +		return error;
> +
> +	error = gfs2_change_nlink(ip, -1);
>  	if (error)
>  		return error;
>  
> diff --git a/fs/gfs2/ondisk.c b/fs/gfs2/ondisk.c
> index e224f6a..b4e354b 100644
> --- a/fs/gfs2/ondisk.c
> +++ b/fs/gfs2/ondisk.c
> @@ -164,7 +164,7 @@ void gfs2_dinode_out(const struct gfs2_i
>  	str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
>  	str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
>  	str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
> -	str->di_nlink = cpu_to_be32(di->di_nlink);
> +	str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
>  	str->di_size = cpu_to_be64(di->di_size);
>  	str->di_blocks = cpu_to_be64(di->di_blocks);
>  	str->di_atime = cpu_to_be64(di->di_atime);
> @@ -191,7 +191,6 @@ void gfs2_dinode_print(const struct gfs2
>  
>  	gfs2_inum_print(&ip->i_num);
>  
> -	pv(di, di_nlink, "%u");
>  	printk(KERN_INFO "  di_size = %llu\n", (unsigned long long)di->di_size);
>  	printk(KERN_INFO "  di_blocks = %llu\n", (unsigned long long)di->di_blocks);
>  	printk(KERN_INFO "  di_atime = %lld\n", (long long)di->di_atime);
> diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
> index efbcec3..06176de 100644
> --- a/fs/gfs2/ops_inode.c
> +++ b/fs/gfs2/ops_inode.c
> @@ -169,7 +169,7 @@ static int gfs2_link(struct dentry *old_
>  	}
>  
>  	error = -EINVAL;
> -	if (!dip->i_di.di_nlink)
> +	if (!dip->i_inode.i_nlink)
>  		goto out_gunlock;
>  	error = -EFBIG;
>  	if (dip->i_di.di_entries == (u32)-1)
> @@ -178,10 +178,10 @@ static int gfs2_link(struct dentry *old_
>  	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
>  		goto out_gunlock;
>  	error = -EINVAL;
> -	if (!ip->i_di.di_nlink)
> +	if (!ip->i_inode.i_nlink)
>  		goto out_gunlock;
>  	error = -EMLINK;
> -	if (ip->i_di.di_nlink == (u32)-1)
> +	if (ip->i_inode.i_nlink == (u32)-1)
>  		goto out_gunlock;
>  
>  	alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
> @@ -386,7 +386,7 @@ static int gfs2_mkdir(struct inode *dir,
>  
>  	ip = ghs[1].gh_gl->gl_object;
>  
> -	ip->i_di.di_nlink = 2;
> +	ip->i_inode.i_nlink = 2;
>  	ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
>  	ip->i_di.di_flags |= GFS2_DIF_JDATA;
>  	ip->i_di.di_payload_format = GFS2_FORMAT_DE;
> @@ -636,7 +636,7 @@ static int gfs2_rename(struct inode *odi
>  		};
>  
>  		if (odip != ndip) {
> -			if (!ndip->i_di.di_nlink) {
> +			if (!ndip->i_inode.i_nlink) {
>  				error = -EINVAL;
>  				goto out_gunlock;
>  			}
> @@ -645,7 +645,7 @@ static int gfs2_rename(struct inode *odi
>  				goto out_gunlock;
>  			}
>  			if (S_ISDIR(ip->i_inode.i_mode) &&
> -			    ndip->i_di.di_nlink == (u32)-1) {
> +			    ndip->i_inode.i_nlink == (u32)-1) {
>  				error = -EMLINK;
>  				goto out_gunlock;
>  			}
> diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
> index 896c7f8..c61517b 100644
> --- a/include/linux/gfs2_ondisk.h
> +++ b/include/linux/gfs2_ondisk.h
> @@ -322,7 +322,6 @@ struct gfs2_dinode {
>  };
>  
>  struct gfs2_dinode_host {
> -	__u32 di_nlink;	/* number of links to this file */
>  	__u64 di_size;	/* number of bytes in file */
>  	__u64 di_blocks;	/* number of blocks in file */
>  	__u64 di_atime;	/* time last accessed */
-- 
Russell Cattelan <cattelan@thebarn.com>

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