Commit 091806ed authored by Bob Peterson's avatar Bob Peterson Committed by Steven Whitehouse
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[GFS2] filesystem consistency error from do_strip 



This patch fixes a GFS2 filesystem consistency error reported from
function do_strip.  The problem was caused by a timing window
that allowed two vfs inodes to be created in memory that point
to the same file.  The problem is fixed by making the vfs's
iget_test, iget_set mechanism check and set a new bit in the
in-core gfs2_inode structure while the vfs inode spin_lock is held.

Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 492c2e47

fs/gfs2/glops.c

+1 −1
Original line number Diff line number Diff line
@@ -249,7 +249,7 @@ static int inode_go_lock(struct gfs2_holder *gh) 
	struct gfs2_inode *ip = gl->gl_object;

	int error = 0;



	if (!ip)

	if (!ip || (gh->gh_flags & GL_SKIP))

		return 0;



	if (test_bit(GIF_INVALID, &ip->i_flags)) {

fs/gfs2/incore.h

+1 −0
Original line number Diff line number Diff line
@@ -236,6 +236,7 @@ enum { 
	GIF_INVALID		= 0,

	GIF_QD_LOCKED		= 1,

	GIF_SW_PAGED		= 3,

	GIF_USER                = 4, /* user inode, not metadata addr space */

};



struct gfs2_dinode_host {

fs/gfs2/inode.c

+5 −5
Original line number Diff line number Diff line
@@ -47,8 +47,7 @@ static int iget_test(struct inode *inode, void *opaque) 
	struct gfs2_inode *ip = GFS2_I(inode);

	u64 *no_addr = opaque;



	if (ip->i_no_addr == *no_addr &&

	    inode->i_private != NULL)

	if (ip->i_no_addr == *no_addr && test_bit(GIF_USER, &ip->i_flags))

		return 1;



	return 0;
@@ -61,6 +60,7 @@ static int iget_set(struct inode *inode, void *opaque) 


	inode->i_ino = (unsigned long)*no_addr;

	ip->i_no_addr = *no_addr;

	set_bit(GIF_USER, &ip->i_flags);

	return 0;

}
@@ -86,7 +86,7 @@ static int iget_skip_test(struct inode *inode, void *opaque) 
	struct gfs2_inode *ip = GFS2_I(inode);

	struct gfs2_skip_data *data = opaque;



	if (ip->i_no_addr == data->no_addr && inode->i_private != NULL){

	if (ip->i_no_addr == data->no_addr && test_bit(GIF_USER, &ip->i_flags)){

		if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)){

			data->skipped = 1;

			return 0;
@@ -105,6 +105,7 @@ static int iget_skip_set(struct inode *inode, void *opaque) 
		return 1;

	inode->i_ino = (unsigned long)(data->no_addr);

	ip->i_no_addr = data->no_addr;

	set_bit(GIF_USER, &ip->i_flags);

	return 0;

}
@@ -187,7 +188,6 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, 


	if (inode->i_state & I_NEW) {

		struct gfs2_sbd *sdp = GFS2_SB(inode);

		inode->i_private = ip;

		ip->i_no_formal_ino = no_formal_ino;



		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);

fs/gfs2/meta_io.c

+4 −2
Original line number Diff line number Diff line 
/*

 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.

 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.

 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.

 *

 * This copyrighted material is made available to anyone wishing to use,

 * modify, copy, or redistribute it subject to the terms and conditions
@@ -69,13 +69,15 @@ static const struct address_space_operations aspace_aops = { 
struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp)

{

	struct inode *aspace;

	struct gfs2_inode *ip;



	aspace = new_inode(sdp->sd_vfs);

	if (aspace) {

		mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS);

		aspace->i_mapping->a_ops = &aspace_aops;

		aspace->i_size = ~0ULL;

		aspace->i_private = NULL;

		ip = GFS2_I(aspace);

		clear_bit(GIF_USER, &ip->i_flags);

		insert_inode_hash(aspace);

	}

	return aspace;

fs/gfs2/ops_super.c

+9 −7
Original line number Diff line number Diff line 
/*

 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.

 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.

 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.

 *

 * This copyrighted material is made available to anyone wishing to use,

 * modify, copy, or redistribute it subject to the terms and conditions
@@ -52,7 +52,7 @@ static int gfs2_write_inode(struct inode *inode, int sync) 
	struct gfs2_inode *ip = GFS2_I(inode);



	/* Check this is a "normal" inode */

	if (inode->i_private) {

	if (test_bit(GIF_USER, &ip->i_flags)) {

		if (current->flags & PF_MEMALLOC)

			return 0;

		if (sync)
@@ -297,8 +297,9 @@ static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 
 */

static void gfs2_drop_inode(struct inode *inode)

{

	if (inode->i_private && inode->i_nlink) {

	struct gfs2_inode *ip = GFS2_I(inode);



	if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {

		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;

		if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))

			clear_nlink(inode);
@@ -314,12 +315,13 @@ static void gfs2_drop_inode(struct inode *inode) 


static void gfs2_clear_inode(struct inode *inode)

{

	struct gfs2_inode *ip = GFS2_I(inode);



	/* This tells us its a "real" inode and not one which only

	 * serves to contain an address space (see rgrp.c, meta_io.c)

	 * which therefore doesn't have its own glocks.

	 */

	if (inode->i_private) {

		struct gfs2_inode *ip = GFS2_I(inode);

	if (test_bit(GIF_USER, &ip->i_flags)) {

		ip->i_gl->gl_object = NULL;

		gfs2_glock_schedule_for_reclaim(ip->i_gl);

		gfs2_glock_put(ip->i_gl);
@@ -419,7 +421,7 @@ static void gfs2_delete_inode(struct inode *inode) 
	struct gfs2_holder gh;

	int error;



	if (!inode->i_private)

	if (!test_bit(GIF_USER, &ip->i_flags))

		goto out;



	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);

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