gfs2: Turn gl_delete into a delayed work

This requires flushing delayed work items in gfs2_make_fs_ro (which is called
before unmounting a filesystem).

When inodes are deleted and then recreated, pending gl_delete work items would
have no effect because the inode generations will have changed, so we can
cancel any pending gl_delete works before reusing iopen glocks.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2020-01-16 20:12:26 +01:00
Родитель f286d627ef
Коммит a0e3cc65fa
7 изменённых файлов: 65 добавлений и 8 удалений

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@ -776,11 +776,16 @@ bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation)
static void delete_work_func(struct work_struct *work)
{
struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
struct delayed_work *dwork = to_delayed_work(work);
struct gfs2_glock *gl = container_of(dwork, struct gfs2_glock, gl_delete);
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct inode *inode;
u64 no_addr = gl->gl_name.ln_number;
spin_lock(&gl->gl_lockref.lock);
clear_bit(GLF_PENDING_DELETE, &gl->gl_flags);
spin_unlock(&gl->gl_lockref.lock);
/* If someone's using this glock to create a new dinode, the block must
have been freed by another node, then re-used, in which case our
iopen callback is too late after the fact. Ignore it. */
@ -949,7 +954,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
gl->gl_object = NULL;
gl->gl_hold_time = GL_GLOCK_DFT_HOLD;
INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
INIT_WORK(&gl->gl_delete, delete_work_func);
INIT_DELAYED_WORK(&gl->gl_delete, delete_work_func);
mapping = gfs2_glock2aspace(gl);
if (mapping) {
@ -1772,6 +1777,44 @@ static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
rhashtable_walk_exit(&iter);
}
bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay)
{
bool queued;
spin_lock(&gl->gl_lockref.lock);
queued = queue_delayed_work(gfs2_delete_workqueue,
&gl->gl_delete, delay);
if (queued)
set_bit(GLF_PENDING_DELETE, &gl->gl_flags);
spin_unlock(&gl->gl_lockref.lock);
return queued;
}
void gfs2_cancel_delete_work(struct gfs2_glock *gl)
{
if (cancel_delayed_work_sync(&gl->gl_delete)) {
clear_bit(GLF_PENDING_DELETE, &gl->gl_flags);
gfs2_glock_put(gl);
}
}
bool gfs2_delete_work_queued(const struct gfs2_glock *gl)
{
return test_bit(GLF_PENDING_DELETE, &gl->gl_flags);
}
static void flush_delete_work(struct gfs2_glock *gl)
{
flush_delayed_work(&gl->gl_delete);
gfs2_glock_queue_work(gl, 0);
}
void gfs2_flush_delete_work(struct gfs2_sbd *sdp)
{
glock_hash_walk(flush_delete_work, sdp);
flush_workqueue(gfs2_delete_workqueue);
}
/**
* thaw_glock - thaw out a glock which has an unprocessed reply waiting
* @gl: The glock to thaw

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@ -235,6 +235,10 @@ static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
extern bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay);
extern void gfs2_cancel_delete_work(struct gfs2_glock *gl);
extern bool gfs2_delete_work_queued(const struct gfs2_glock *gl);
extern void gfs2_flush_delete_work(struct gfs2_sbd *sdp);
extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
extern void gfs2_glock_thaw(struct gfs2_sbd *sdp);

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@ -608,11 +608,17 @@ static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
if (gl->gl_demote_state == LM_ST_UNLOCKED &&
gl->gl_state == LM_ST_SHARED && ip) {
gl->gl_lockref.count++;
if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
if (!queue_delayed_work(gfs2_delete_workqueue,
&gl->gl_delete, 0))
gl->gl_lockref.count--;
}
}
static int iopen_go_demote_ok(const struct gfs2_glock *gl)
{
return !gfs2_delete_work_queued(gl);
}
/**
* inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
* @gl: glock being freed
@ -716,6 +722,7 @@ const struct gfs2_glock_operations gfs2_freeze_glops = {
const struct gfs2_glock_operations gfs2_iopen_glops = {
.go_type = LM_TYPE_IOPEN,
.go_callback = iopen_go_callback,
.go_demote_ok = iopen_go_demote_ok,
.go_flags = GLOF_LRU | GLOF_NONDISK,
};

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@ -345,6 +345,7 @@ enum {
GLF_OBJECT = 14, /* Used only for tracing */
GLF_BLOCKING = 15,
GLF_INODE_CREATING = 16, /* Inode creation occurring */
GLF_PENDING_DELETE = 17,
GLF_FREEING = 18, /* Wait for glock to be freed */
};
@ -378,8 +379,8 @@ struct gfs2_glock {
atomic_t gl_revokes;
struct delayed_work gl_work;
union {
/* For inode and iopen glocks only */
struct work_struct gl_delete;
/* For iopen glocks only */
struct delayed_work gl_delete;
/* For rgrp glocks only */
struct {
loff_t start;

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@ -170,6 +170,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
if (unlikely(error))
goto fail;
gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
glock_set_object(ip->i_iopen_gh.gh_gl, ip);
gfs2_glock_put(io_gl);
io_gl = NULL;
@ -724,6 +725,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
if (error)
goto fail_gunlock2;
gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
glock_set_object(ip->i_iopen_gh.gh_gl, ip);
gfs2_set_iop(inode);
insert_inode_hash(inode);

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@ -1835,7 +1835,7 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip
*/
ip = gl->gl_object;
if (ip || queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
if (ip || !gfs2_queue_delete_work(gl, 0))
gfs2_glock_put(gl);
else
found++;

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@ -626,7 +626,7 @@ int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
}
}
flush_workqueue(gfs2_delete_workqueue);
gfs2_flush_delete_work(sdp);
if (!log_write_allowed && current == sdp->sd_quotad_process)
fs_warn(sdp, "The quotad daemon is withdrawing.\n");
else if (sdp->sd_quotad_process)
@ -1054,7 +1054,7 @@ static int gfs2_drop_inode(struct inode *inode)
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
gfs2_glock_hold(gl);
if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
if (!gfs2_queue_delete_work(gl, 0))
gfs2_glock_queue_put(gl);
return false;
}