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Commit 4f56110a authored by Steven Whitehouse's avatar Steven Whitehouse
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[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.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 2933f925

fs/gfs2/inode.c

+24 −13
Original line number Diff line number Diff line
@@ -51,7 +51,6 @@ void gfs2_inode_attr_in(struct gfs2_inode *ip) 
	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_inode *ip, const void *buf) 


	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 *ip, int diff) 
	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 *ip, int diff) 
	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 *ip, int diff) 
		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 *dip, const struct qstr *name, 
		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 *dip, const struct qstr *name, 


	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 *dip, const struct qstr *name, 
	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, const struct qstr *name, 
	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;

fs/gfs2/ondisk.c

+1 −2
Original line number Diff line number Diff line
@@ -164,7 +164,7 @@ void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 
	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_inode *ip) 


	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);

fs/gfs2/ops_inode.c

+6 −6
Original line number Diff line number Diff line
@@ -169,7 +169,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 
	}



	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_dentry, struct inode *dir, 
	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, struct dentry *dentry, int mode) 


	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 *odir, struct dentry *odentry, 
		};



		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 *odir, struct dentry *odentry, 
				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;

			}

include/linux/gfs2_ondisk.h

+0 −1
Original line number Diff line number Diff line
@@ -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 */