Commit a63b7bbc authored by Benjamin Marzinski's avatar Benjamin Marzinski Committed by Bob Peterson
Browse files

GFS2: add support for rename2 and RENAME_EXCHANGE 



gfs2 now uses the rename2 directory iop, and supports the
RENAME_EXCHANGE flag (as well as RENAME_NOREPLACE, which the vfs
takes care of).

Signed-off-by: Benjamin Marzinski <bmarzins redhat com>
Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
parent 959b6717

fs/gfs2/inode.c

+189 −16
Original line number Diff line number Diff line
@@ -1306,6 +1306,35 @@ static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 
	return error;

}



/**

 * update_moved_ino - Update an inode that's being moved

 * @ip: The inode being moved

 * @ndip: The parent directory of the new filename

 * @dir_rename: True of ip is a directory

 *

 * Returns: errno

 */



static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,

			    int dir_rename)

{

	int error;

	struct buffer_head *dibh;



	if (dir_rename)

		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);



	error = gfs2_meta_inode_buffer(ip, &dibh);

	if (error)

		return error;

	ip->i_inode.i_ctime = CURRENT_TIME;

	gfs2_trans_add_meta(ip->i_gl, dibh);

	gfs2_dinode_out(ip, dibh->b_data);

	brelse(dibh);

	return 0;

}





/**

 * gfs2_rename - Rename a file

 * @odir: Parent directory of old file name
@@ -1354,7 +1383,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry, 


		if (S_ISDIR(ip->i_inode.i_mode)) {

			dir_rename = 1;

			/* don't move a dirctory into it's subdir */

			/* don't move a directory into its subdir */

			error = gfs2_ok_to_move(ip, ndip);

			if (error)

				goto out_gunlock_r;
@@ -1494,20 +1523,9 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry, 
	if (nip)

		error = gfs2_unlink_inode(ndip, ndentry);



	if (dir_rename) {

		error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);

		if (error)

			goto out_end_trans;

	} else {

		struct buffer_head *dibh;

		error = gfs2_meta_inode_buffer(ip, &dibh);

	error = update_moved_ino(ip, ndip, dir_rename);

	if (error)

		goto out_end_trans;

		ip->i_inode.i_ctime = CURRENT_TIME;

		gfs2_trans_add_meta(ip->i_gl, dibh);

		gfs2_dinode_out(ip, dibh->b_data);

		brelse(dibh);

	}



	error = gfs2_dir_del(odip, odentry);

	if (error)
@@ -1538,6 +1556,161 @@ out: 
	return error;

}



/**

 * gfs2_exchange - exchange two files

 * @odir: Parent directory of old file name

 * @odentry: The old dentry of the file

 * @ndir: Parent directory of new file name

 * @ndentry: The new dentry of the file

 * @flags: The rename flags

 *

 * Returns: errno

 */



static int gfs2_exchange(struct inode *odir, struct dentry *odentry,

			 struct inode *ndir, struct dentry *ndentry,

			 unsigned int flags)

{

	struct gfs2_inode *odip = GFS2_I(odir);

	struct gfs2_inode *ndip = GFS2_I(ndir);

	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);

	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);

	struct gfs2_sbd *sdp = GFS2_SB(odir);

	struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };

	unsigned int num_gh;

	unsigned int x;

	umode_t old_mode = oip->i_inode.i_mode;

	umode_t new_mode = nip->i_inode.i_mode;

	int error;



	error = gfs2_rindex_update(sdp);

	if (error)

		return error;



	if (odip != ndip) {

		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,

					   0, &r_gh);

		if (error)

			goto out;



		if (S_ISDIR(old_mode)) {

			/* don't move a directory into its subdir */

			error = gfs2_ok_to_move(oip, ndip);

			if (error)

				goto out_gunlock_r;

		}



		if (S_ISDIR(new_mode)) {

			/* don't move a directory into its subdir */

			error = gfs2_ok_to_move(nip, odip);

			if (error)

				goto out_gunlock_r;

		}

	}



	num_gh = 1;

	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);

	if (odip != ndip) {

		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);

		num_gh++;

	}

	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);

	num_gh++;



	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);

	num_gh++;



	for (x = 0; x < num_gh; x++) {

		error = gfs2_glock_nq(ghs + x);

		if (error)

			goto out_gunlock;

	}



	error = -ENOENT;

	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)

		goto out_gunlock;



	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);

	if (error)

		goto out_gunlock;

	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);

	if (error)

		goto out_gunlock;



	if (S_ISDIR(old_mode)) {

		error = gfs2_permission(odentry->d_inode, MAY_WRITE);

		if (error)

			goto out_gunlock;

	}

	if (S_ISDIR(new_mode)) {

		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);

		if (error)

			goto out_gunlock;

	}

	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);

	if (error)

		goto out_gunlock;



	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));

	if (error)

		goto out_end_trans;



	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));

	if (error)

		goto out_end_trans;



	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,

			       IF2DT(old_mode));

	if (error)

		goto out_end_trans;



	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,

			       IF2DT(new_mode));

	if (error)

		goto out_end_trans;



	if (odip != ndip) {

		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {

			inc_nlink(&odip->i_inode);

			drop_nlink(&ndip->i_inode);

		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {

			inc_nlink(&ndip->i_inode);

			drop_nlink(&odip->i_inode);

		}

	}

	mark_inode_dirty(&ndip->i_inode);

	if (odip != ndip)

		mark_inode_dirty(&odip->i_inode);



out_end_trans:

	gfs2_trans_end(sdp);

out_gunlock:

	while (x--) {

		gfs2_glock_dq(ghs + x);

		gfs2_holder_uninit(ghs + x);

	}

out_gunlock_r:

	if (r_gh.gh_gl)

		gfs2_glock_dq_uninit(&r_gh);

out:

	return error;

}



static int gfs2_rename2(struct inode *odir, struct dentry *odentry,

			struct inode *ndir, struct dentry *ndentry,

			unsigned int flags)

{

	flags &= ~RENAME_NOREPLACE;



	if (flags & ~RENAME_EXCHANGE)

		return -EINVAL;



	if (flags & RENAME_EXCHANGE)

		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);



	return gfs2_rename(odir, odentry, ndir, ndentry);

}



/**

 * gfs2_follow_link - Follow a symbolic link

 * @dentry: The dentry of the link
@@ -1943,7 +2116,7 @@ const struct inode_operations gfs2_dir_iops = { 
	.mkdir = gfs2_mkdir,

	.rmdir = gfs2_unlink,

	.mknod = gfs2_mknod,

	.rename = gfs2_rename,

	.rename2 = gfs2_rename2,

	.permission = gfs2_permission,

	.setattr = gfs2_setattr,

	.getattr = gfs2_getattr,

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