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gfs2: Lock holder cleanup 

Make the code more readable by cleaning up the different ways of
initializing lock holders and checking for initialized lock holders:
mark lock holders as uninitialized by setting the holder's glock to NULL
(gfs2_holder_mark_uninitialized) instead of zeroing out the entire
object or using a separate flag.  Recognize initialized holders by their
non-NULL glock (gfs2_holder_initialized).  Don't zero out holder objects
which are immeditiately initialized via gfs2_holder_init or
gfs2_glock_nq_init.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2016-06-17 07:31:27 -05:00 committed by Bob Peterson
parent cda9dd4207
commit 6df9f9a253
9 changed files with 46 additions and 35 deletions
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2
fs/gfs2/dentry.c
View File

@ -117,7 +117,7 @@ static int gfs2_dentry_delete(const struct dentry *dentry)
return 0;
ginode = GFS2_I(d_inode(dentry));
if (!ginode->i_iopen_gh.gh_gl)
if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
return 0;
if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))

2
fs/gfs2/file.c
View File

@ -1098,7 +1098,7 @@ static void do_unflock(struct file *file, struct file_lock *fl)
mutex_lock(&fp->f_fl_mutex);
locks_lock_file_wait(file, fl);
if (fl_gh->gh_gl) {
if (gfs2_holder_initialized(fl_gh)) {
gfs2_glock_dq(fl_gh);
gfs2_holder_uninit(fl_gh);
}

2
fs/gfs2/glock.c
View File

@ -801,7 +801,7 @@ void gfs2_holder_uninit(struct gfs2_holder *gh)
{
put_pid(gh->gh_owner_pid);
gfs2_glock_put(gh->gh_gl);
gh->gh_gl = NULL;
gfs2_holder_mark_uninitialized(gh);
gh->gh_ip = 0;
}

10
fs/gfs2/glock.h
View File

@ -247,4 +247,14 @@ extern void gfs2_unregister_debugfs(void);
extern const struct lm_lockops gfs2_dlm_ops;
static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder *gh)
{
gh->gh_gl = NULL;
}
static inline bool gfs2_holder_initialized(struct gfs2_holder *gh)
{
return gh->gh_gl;
}
#endif /* __GLOCK_DOT_H__ */

33
fs/gfs2/inode.c
View File

@ -127,9 +127,9 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
struct gfs2_inode *ip;
struct gfs2_glock *io_gl = NULL;
struct gfs2_holder i_gh;
bool unlock = false;
int error;
gfs2_holder_mark_uninitialized(&i_gh);
inode = gfs2_iget(sb, no_addr);
if (!inode)
return ERR_PTR(-ENOMEM);
@ -159,7 +159,6 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
GL_SKIP, &i_gh);
if (error)
goto fail_put;
unlock = true;
if (blktype != GFS2_BLKST_FREE) {
error = gfs2_check_blk_type(sdp, no_addr,
@ -191,7 +190,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
unlock_new_inode(inode);
}
if (unlock)
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
return inode;
@ -203,7 +202,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
fail_put:
if (io_gl)
gfs2_glock_put(io_gl);
if (unlock)
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
ip->i_gl->gl_object = NULL;
fail:
@ -281,8 +280,8 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
struct gfs2_holder d_gh;
int error = 0;
struct inode *inode = NULL;
int unlock = 0;
gfs2_holder_mark_uninitialized(&d_gh);
if (!name->len || name->len > GFS2_FNAMESIZE)
return ERR_PTR(-ENAMETOOLONG);
@ -297,7 +296,6 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
if (error)
return ERR_PTR(error);
unlock = 1;
}
if (!is_root) {
@ -310,7 +308,7 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
if (IS_ERR(inode))
error = PTR_ERR(inode);
out:
if (unlock)
if (gfs2_holder_initialized(&d_gh))
gfs2_glock_dq_uninit(&d_gh);
if (error == -ENOENT)
return NULL;
@ -1354,7 +1352,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
struct gfs2_inode *nip = NULL;
struct gfs2_sbd *sdp = GFS2_SB(odir);
struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
struct gfs2_holder ghs[5], r_gh;
struct gfs2_rgrpd *nrgd;
unsigned int num_gh;
int dir_rename = 0;
@ -1362,6 +1360,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
unsigned int x;
int error;
gfs2_holder_mark_uninitialized(&r_gh);
if (d_really_is_positive(ndentry)) {
nip = GFS2_I(d_inode(ndentry));
if (ip == nip)
@ -1551,7 +1550,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
if (r_gh.gh_gl)
if (gfs2_holder_initialized(&r_gh))
gfs2_glock_dq_uninit(&r_gh);
out:
return error;
@ -1577,13 +1576,14 @@ static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
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, };
struct gfs2_holder ghs[5], r_gh;
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;
gfs2_holder_mark_uninitialized(&r_gh);
error = gfs2_rindex_update(sdp);
if (error)
return error;
@ -1691,7 +1691,7 @@ static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
if (r_gh.gh_gl)
if (gfs2_holder_initialized(&r_gh))
gfs2_glock_dq_uninit(&r_gh);
out:
return error;
@ -1788,9 +1788,8 @@ int gfs2_permission(struct inode *inode, int mask)
struct gfs2_inode *ip;
struct gfs2_holder i_gh;
int error;
int unlock = 0;
gfs2_holder_mark_uninitialized(&i_gh);
ip = GFS2_I(inode);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
if (mask & MAY_NOT_BLOCK)
@ -1798,14 +1797,13 @@ int gfs2_permission(struct inode *inode, int mask)
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
if (error)
return error;
unlock = 1;
}
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
error = -EACCES;
else
error = generic_permission(inode, mask);
if (unlock)
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
return error;
@ -1977,17 +1975,16 @@ static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int error;
int unlock = 0;
gfs2_holder_mark_uninitialized(&gh);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (error)
return error;
unlock = 1;
}
generic_fillattr(inode, stat);
if (unlock)
if (gfs2_holder_initialized(&gh))
gfs2_glock_dq_uninit(&gh);
return 0;

2
fs/gfs2/main.c
View File

@ -45,7 +45,7 @@ static void gfs2_init_inode_once(void *foo)
memset(&ip->i_res, 0, sizeof(ip->i_res));
RB_CLEAR_NODE(&ip->i_res.rs_node);
ip->i_hash_cache = NULL;
ip->i_iopen_gh.gh_gl = NULL;
gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
}
static void gfs2_init_glock_once(void *foo)

2
fs/gfs2/quota.c
View File

@ -883,7 +883,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
&data_blocks, &ind_blocks);
ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
ghs = kmalloc(num_qd * sizeof(struct gfs2_holder), GFP_NOFS);
if (!ghs)
return -ENOMEM;

4
fs/gfs2/rgrp.c
View File

@ -2100,7 +2100,7 @@ void gfs2_inplace_release(struct gfs2_inode *ip)
{
struct gfs2_blkreserv *rs = &ip->i_res;
if (rs->rs_rgd_gh.gh_gl)
if (gfs2_holder_initialized(&rs->rs_rgd_gh))
gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
}
@ -2600,7 +2600,7 @@ void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state)
{
unsigned int x;
rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
rlist->rl_ghs = kmalloc(rlist->rl_rgrps * sizeof(struct gfs2_holder),
GFP_NOFS | __GFP_NOFAIL);
for (x = 0; x < rlist->rl_rgrps; x++)
gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,

24
fs/gfs2/super.c
View File

@ -855,7 +855,7 @@ static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
if (freeze_gh.gh_gl)
if (gfs2_holder_initialized(&freeze_gh))
gfs2_glock_dq_uninit(&freeze_gh);
gfs2_quota_cleanup(sdp);
@ -1033,7 +1033,7 @@ static int gfs2_unfreeze(struct super_block *sb)
mutex_lock(&sdp->sd_freeze_mutex);
if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
sdp->sd_freeze_gh.gh_gl == NULL) {
!gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
mutex_unlock(&sdp->sd_freeze_mutex);
return 0;
}
@ -1084,9 +1084,11 @@ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host
int error = 0, err;
memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
gha = kmalloc(slots * sizeof(struct gfs2_holder), GFP_KERNEL);
if (!gha)
return -ENOMEM;
for (x = 0; x < slots; x++)
gfs2_holder_mark_uninitialized(gha + x);
rgd_next = gfs2_rgrpd_get_first(sdp);
@ -1096,7 +1098,7 @@ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host
for (x = 0; x < slots; x++) {
gh = gha + x;
if (gh->gh_gl && gfs2_glock_poll(gh)) {
if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
err = gfs2_glock_wait(gh);
if (err) {
gfs2_holder_uninit(gh);
@ -1109,7 +1111,7 @@ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host
}
}
if (gh->gh_gl)
if (gfs2_holder_initialized(gh))
done = 0;
else if (rgd_next && !error) {
error = gfs2_glock_nq_init(rgd_next->rd_gl,
@ -1304,9 +1306,11 @@ static int gfs2_drop_inode(struct inode *inode)
{
struct gfs2_inode *ip = GFS2_I(inode);
if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) {
if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
inode->i_nlink &&
gfs2_holder_initialized(&ip->i_iopen_gh)) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
if (test_bit(GLF_DEMOTE, &gl->gl_flags))
clear_nlink(inode);
}
return generic_drop_inode(inode);
@ -1551,7 +1555,7 @@ static void gfs2_evict_inode(struct inode *inode)
goto out_truncate;
}
if (ip->i_iopen_gh.gh_gl &&
if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_wait(&ip->i_iopen_gh);
@ -1610,7 +1614,7 @@ static void gfs2_evict_inode(struct inode *inode)
if (gfs2_rs_active(&ip->i_res))
gfs2_rs_deltree(&ip->i_res);
if (ip->i_iopen_gh.gh_gl) {
if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_wait(&ip->i_iopen_gh);
@ -1632,7 +1636,7 @@ static void gfs2_evict_inode(struct inode *inode)
gfs2_glock_add_to_lru(ip->i_gl);
gfs2_glock_put(ip->i_gl);
ip->i_gl = NULL;
if (ip->i_iopen_gh.gh_gl) {
if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
ip->i_iopen_gh.gh_gl->gl_object = NULL;
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_wait(&ip->i_iopen_gh);