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gfs2: Protect gl->gl_object by spin lock

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Put all remaining accesses to gl->gl_object under the
gl->gl_lockref.lock spinlock to prevent races.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2017-06-30 07:55:08 -05:00 committed by Bob Peterson
parent 4fd1a57952
commit 6f6597baae
9 changed files with 35 additions and 21 deletions
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2
fs/gfs2/bmap.c
View File

@ -970,7 +970,7 @@ more_rgrps:
continue;
bn = be64_to_cpu(*p);
if (gfs2_holder_initialized(rd_gh)) {
rgd = (struct gfs2_rgrpd *)rd_gh->gh_gl->gl_object;
rgd = gfs2_glock2rgrp(rd_gh->gh_gl);
gfs2_assert_withdraw(sdp,
gfs2_glock_is_locked_by_me(rd_gh->gh_gl));
} else {

4
fs/gfs2/dir.c
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@ -2032,8 +2032,8 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
for (x = 0; x < rlist.rl_rgrps; x++) {
struct gfs2_rgrpd *rgd;
rgd = rlist.rl_ghs[x].gh_gl->gl_object;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
rg_blocks += rgd->rd_length;
}

17
fs/gfs2/glops.c
View File

@ -137,7 +137,7 @@ void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
*
* Called when demoting or unlocking an EX glock. We must flush
* to disk all dirty buffers/pages relating to this glock, and must not
* not return to caller to demote/unlock the glock until I/O is complete.
* return to caller to demote/unlock the glock until I/O is complete.
*/
static void rgrp_go_sync(struct gfs2_glock *gl)
@ -184,7 +184,7 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct address_space *mapping = &sdp->sd_aspace;
struct gfs2_rgrpd *rgd = gl->gl_object;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
if (rgd)
gfs2_rgrp_brelse(rgd);
@ -209,6 +209,17 @@ static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
return ip;
}
struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
{
struct gfs2_rgrpd *rgd;
spin_lock(&gl->gl_lockref.lock);
rgd = gl->gl_object;
spin_unlock(&gl->gl_lockref.lock);
return rgd;
}
static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
{
if (!ip)
@ -566,7 +577,7 @@ static int freeze_go_demote_ok(const struct gfs2_glock *gl)
*/
static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
{
struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
struct gfs2_inode *ip = gl->gl_object;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY))

2
fs/gfs2/incore.h
View File

@ -857,5 +857,7 @@ static inline void gfs2_sbstats_inc(const struct gfs2_glock *gl, int which)
preempt_enable();
}
extern struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl);
#endif /* __INCORE_DOT_H__ */

8
fs/gfs2/inode.c
View File

@ -202,14 +202,14 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
fail_refresh:
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
ip->i_iopen_gh.gh_gl->gl_object = NULL;
glock_set_object(ip->i_iopen_gh.gh_gl, NULL);
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
fail_put:
if (io_gl)
gfs2_glock_put(io_gl);
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
ip->i_gl->gl_object = NULL;
glock_set_object(ip->i_gl, NULL);
fail:
iget_failed(inode);
return ERR_PTR(error);
@ -706,7 +706,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
if (error)
goto fail_free_inode;
ip->i_gl->gl_object = ip;
glock_set_object(ip->i_gl, ip);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
if (error)
goto fail_free_inode;
@ -732,7 +732,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
if (error)
goto fail_gunlock2;
ip->i_iopen_gh.gh_gl->gl_object = ip;
glock_set_object(ip->i_iopen_gh.gh_gl, ip);
gfs2_glock_put(io_gl);
gfs2_set_iop(inode);
insert_inode_hash(inode);

2
fs/gfs2/lops.c
View File

@ -71,7 +71,7 @@ static void maybe_release_space(struct gfs2_bufdata *bd)
{
struct gfs2_glock *gl = bd->bd_gl;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_rgrpd *rgd = gl->gl_object;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
struct gfs2_bitmap *bi = rgd->rd_bits + index;

6
fs/gfs2/rgrp.c
View File

@ -705,9 +705,7 @@ void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
rb_erase(n, &sdp->sd_rindex_tree);
if (gl) {
spin_lock(&gl->gl_lockref.lock);
gl->gl_object = NULL;
spin_unlock(&gl->gl_lockref.lock);
glock_set_object(gl, NULL);
gfs2_glock_add_to_lru(gl);
gfs2_glock_put(gl);
}
@ -917,7 +915,7 @@ static int read_rindex_entry(struct gfs2_inode *ip)
error = rgd_insert(rgd);
spin_unlock(&sdp->sd_rindex_spin);
if (!error) {
rgd->rd_gl->gl_object = rgd;
glock_set_object(rgd->rd_gl, rgd);
rgd->rd_gl->gl_vm.start = (rgd->rd_addr * bsize) & PAGE_MASK;
rgd->rd_gl->gl_vm.end = PAGE_ALIGN((rgd->rd_addr +
rgd->rd_length) * bsize) - 1;

11
fs/gfs2/super.c
View File

@ -1105,9 +1105,12 @@ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host
gfs2_holder_uninit(gh);
error = err;
} else {
if (!error)
error = statfs_slow_fill(
gh->gh_gl->gl_object, sc);
if (!error) {
struct gfs2_rgrpd *rgd =
gfs2_glock2rgrp(gh->gh_gl);
error = statfs_slow_fill(rgd, sc);
}
gfs2_glock_dq_uninit(gh);
}
}
@ -1637,7 +1640,7 @@ out:
gfs2_glock_put(ip->i_gl);
ip->i_gl = NULL;
if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
ip->i_iopen_gh.gh_gl->gl_object = NULL;
glock_set_object(ip->i_iopen_gh.gh_gl, NULL);
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
}

4
fs/gfs2/xattr.c
View File

@ -1327,8 +1327,8 @@ static int ea_dealloc_indirect(struct gfs2_inode *ip)
gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
for (x = 0; x < rlist.rl_rgrps; x++) {
struct gfs2_rgrpd *rgd;
rgd = rlist.rl_ghs[x].gh_gl->gl_object;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
rg_blocks += rgd->rd_length;
}