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Commit 2759e05c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'ceph-for-5.2-rc4' of git://github.com/ceph/ceph-client 

Pull ceph fixes from Ilya Dryomov:
 "A change to call iput() asynchronously to avoid a possible deadlock
  when iput_final() needs to wait for in-flight I/O (e.g. readahead) and
  a fixup for a cleanup that went into -rc1"

* tag 'ceph-for-5.2-rc4' of git://github.com/ceph/ceph-client:
  ceph: fix error handling in ceph_get_caps()
  ceph: avoid iput_final() while holding mutex or in dispatch thread
  ceph: single workqueue for inode related works
parents 8e61f6f7 7b2f936f

fs/ceph/caps.c

+19 −15
Original line number Diff line number Diff line
@@ -2738,15 +2738,13 @@ int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 
		_got = 0;

		ret = try_get_cap_refs(ci, need, want, endoff,

				       false, &_got);

		if (ret == -EAGAIN) {

		if (ret == -EAGAIN)

			continue;

		} else if (!ret) {

			int err;



		if (!ret) {

			DEFINE_WAIT_FUNC(wait, woken_wake_function);

			add_wait_queue(&ci->i_cap_wq, &wait);



			while (!(err = try_get_cap_refs(ci, need, want, endoff,

			while (!(ret = try_get_cap_refs(ci, need, want, endoff,

							true, &_got))) {

				if (signal_pending(current)) {

					ret = -ERESTARTSYS;
@@ -2756,14 +2754,16 @@ int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 
			}



			remove_wait_queue(&ci->i_cap_wq, &wait);

			if (err == -EAGAIN)

			if (ret == -EAGAIN)

				continue;

		}

		if (ret < 0) {

			if (ret == -ESTALE) {

				/* session was killed, try renew caps */

				ret = ceph_renew_caps(&ci->vfs_inode);

				if (ret == 0)

					continue;

			}

			return ret;

		}
@@ -2992,8 +2992,10 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 
	}

	if (complete_capsnap)

		wake_up_all(&ci->i_cap_wq);

	while (put-- > 0)

		iput(inode);

	while (put-- > 0) {

		/* avoid calling iput_final() in osd dispatch threads */

		ceph_async_iput(inode);

	}

}



/*
@@ -3964,8 +3966,9 @@ void ceph_handle_caps(struct ceph_mds_session *session, 
done:

	mutex_unlock(&session->s_mutex);

done_unlocked:

	iput(inode);

	ceph_put_string(extra_info.pool_ns);

	/* avoid calling iput_final() in mds dispatch threads */

	ceph_async_iput(inode);

	return;



flush_cap_releases:
@@ -4011,7 +4014,8 @@ void ceph_check_delayed_caps(struct ceph_mds_client *mdsc) 
		if (inode) {

			dout("check_delayed_caps on %p\n", inode);

			ceph_check_caps(ci, flags, NULL);

			iput(inode);

			/* avoid calling iput_final() in tick thread */

			ceph_async_iput(inode);

		}

	}

	spin_unlock(&mdsc->cap_delay_lock);

fs/ceph/file.c

+1 −1
Original line number Diff line number Diff line
@@ -791,7 +791,7 @@ static void ceph_aio_complete_req(struct ceph_osd_request *req) 
		if (aio_work) {

			INIT_WORK(&aio_work->work, ceph_aio_retry_work);

			aio_work->req = req;

			queue_work(ceph_inode_to_client(inode)->wb_wq,

			queue_work(ceph_inode_to_client(inode)->inode_wq,

				   &aio_work->work);

			return;

		}

fs/ceph/inode.c

+83 −72
Original line number Diff line number Diff line
@@ -33,9 +33,7 @@ 


static const struct inode_operations ceph_symlink_iops;



static void ceph_invalidate_work(struct work_struct *work);

static void ceph_writeback_work(struct work_struct *work);

static void ceph_vmtruncate_work(struct work_struct *work);

static void ceph_inode_work(struct work_struct *work);



/*

 * find or create an inode, given the ceph ino number
@@ -509,10 +507,8 @@ struct inode *ceph_alloc_inode(struct super_block *sb) 
	INIT_LIST_HEAD(&ci->i_snap_realm_item);

	INIT_LIST_HEAD(&ci->i_snap_flush_item);



	INIT_WORK(&ci->i_wb_work, ceph_writeback_work);

	INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);



	INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);

	INIT_WORK(&ci->i_work, ceph_inode_work);

	ci->i_work_mask = 0;



	ceph_fscache_inode_init(ci);
@@ -1480,7 +1476,8 @@ static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, 
			pr_err("fill_inode badness on %p got %d\n", in, rc);

			err = rc;

		}

		iput(in);

		/* avoid calling iput_final() in mds dispatch threads */

		ceph_async_iput(in);

	}



	return err;
@@ -1678,8 +1675,11 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
				 &req->r_caps_reservation);

		if (ret < 0) {

			pr_err("fill_inode badness on %p\n", in);

			if (d_really_is_negative(dn))

				iput(in);

			if (d_really_is_negative(dn)) {

				/* avoid calling iput_final() in mds

				 * dispatch threads */

				ceph_async_iput(in);

			}

			d_drop(dn);

			err = ret;

			goto next_item;
@@ -1689,7 +1689,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
			if (ceph_security_xattr_deadlock(in)) {

				dout(" skip splicing dn %p to inode %p"

				     " (security xattr deadlock)\n", dn, in);

				iput(in);

				ceph_async_iput(in);

				skipped++;

				goto next_item;

			}
@@ -1740,57 +1740,87 @@ bool ceph_inode_set_size(struct inode *inode, loff_t size) 
	return ret;

}



/*

 * Put reference to inode, but avoid calling iput_final() in current thread.

 * iput_final() may wait for reahahead pages. The wait can cause deadlock in

 * some contexts.

 */

void ceph_async_iput(struct inode *inode)

{

	if (!inode)

		return;

	for (;;) {

		if (atomic_add_unless(&inode->i_count, -1, 1))

			break;

		if (queue_work(ceph_inode_to_client(inode)->inode_wq,

			       &ceph_inode(inode)->i_work))

			break;

		/* queue work failed, i_count must be at least 2 */

	}

}



/*

 * Write back inode data in a worker thread.  (This can't be done

 * in the message handler context.)

 */

void ceph_queue_writeback(struct inode *inode)

{

	struct ceph_inode_info *ci = ceph_inode(inode);

	set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);



	ihold(inode);

	if (queue_work(ceph_inode_to_client(inode)->wb_wq,

		       &ceph_inode(inode)->i_wb_work)) {

	if (queue_work(ceph_inode_to_client(inode)->inode_wq,

		       &ci->i_work)) {

		dout("ceph_queue_writeback %p\n", inode);

	} else {

		dout("ceph_queue_writeback %p failed\n", inode);

		dout("ceph_queue_writeback %p already queued, mask=%lx\n",

		     inode, ci->i_work_mask);

		iput(inode);

	}

}



static void ceph_writeback_work(struct work_struct *work)

{

	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,

						  i_wb_work);

	struct inode *inode = &ci->vfs_inode;



	dout("writeback %p\n", inode);

	filemap_fdatawrite(&inode->i_data);

	iput(inode);

}



/*

 * queue an async invalidation

 */

void ceph_queue_invalidate(struct inode *inode)

{

	struct ceph_inode_info *ci = ceph_inode(inode);

	set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);



	ihold(inode);

	if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,

		       &ceph_inode(inode)->i_pg_inv_work)) {

	if (queue_work(ceph_inode_to_client(inode)->inode_wq,

		       &ceph_inode(inode)->i_work)) {

		dout("ceph_queue_invalidate %p\n", inode);

	} else {

		dout("ceph_queue_invalidate %p failed\n", inode);

		dout("ceph_queue_invalidate %p already queued, mask=%lx\n",

		     inode, ci->i_work_mask);

		iput(inode);

	}

}



/*

 * Invalidate inode pages in a worker thread.  (This can't be done

 * in the message handler context.)

 * Queue an async vmtruncate.  If we fail to queue work, we will handle

 * the truncation the next time we call __ceph_do_pending_vmtruncate.

 */

static void ceph_invalidate_work(struct work_struct *work)

void ceph_queue_vmtruncate(struct inode *inode)

{

	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,

						  i_pg_inv_work);

	struct inode *inode = &ci->vfs_inode;

	struct ceph_inode_info *ci = ceph_inode(inode);

	set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);



	ihold(inode);

	if (queue_work(ceph_inode_to_client(inode)->inode_wq,

		       &ci->i_work)) {

		dout("ceph_queue_vmtruncate %p\n", inode);

	} else {

		dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",

		     inode, ci->i_work_mask);

		iput(inode);

	}

}



static void ceph_do_invalidate_pages(struct inode *inode)

{

	struct ceph_inode_info *ci = ceph_inode(inode);

	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);

	u32 orig_gen;

	int check = 0;
@@ -1842,44 +1872,6 @@ static void ceph_invalidate_work(struct work_struct *work) 
out:

	if (check)

		ceph_check_caps(ci, 0, NULL);

	iput(inode);

}





/*

 * called by trunc_wq;

 *

 * We also truncate in a separate thread as well.

 */

static void ceph_vmtruncate_work(struct work_struct *work)

{

	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,

						  i_vmtruncate_work);

	struct inode *inode = &ci->vfs_inode;



	dout("vmtruncate_work %p\n", inode);

	__ceph_do_pending_vmtruncate(inode);

	iput(inode);

}



/*

 * Queue an async vmtruncate.  If we fail to queue work, we will handle

 * the truncation the next time we call __ceph_do_pending_vmtruncate.

 */

void ceph_queue_vmtruncate(struct inode *inode)

{

	struct ceph_inode_info *ci = ceph_inode(inode);



	ihold(inode);



	if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,

		       &ci->i_vmtruncate_work)) {

		dout("ceph_queue_vmtruncate %p\n", inode);

	} else {

		dout("ceph_queue_vmtruncate %p failed, pending=%d\n",

		     inode, ci->i_truncate_pending);

		iput(inode);

	}

}



/*
@@ -1943,6 +1935,25 @@ void __ceph_do_pending_vmtruncate(struct inode *inode) 
	wake_up_all(&ci->i_cap_wq);

}



static void ceph_inode_work(struct work_struct *work)

{

	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,

						 i_work);

	struct inode *inode = &ci->vfs_inode;



	if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {

		dout("writeback %p\n", inode);

		filemap_fdatawrite(&inode->i_data);

	}

	if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))

		ceph_do_invalidate_pages(inode);



	if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))

		__ceph_do_pending_vmtruncate(inode);



	iput(inode);

}



/*

 * symlinks

 */

fs/ceph/mds_client.c

+18 −10
Original line number Diff line number Diff line
@@ -690,11 +690,12 @@ void ceph_mdsc_release_request(struct kref *kref) 
		ceph_msg_put(req->r_reply);

	if (req->r_inode) {

		ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);

		iput(req->r_inode);

		/* avoid calling iput_final() in mds dispatch threads */

		ceph_async_iput(req->r_inode);

	}

	if (req->r_parent)

		ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);

	iput(req->r_target_inode);

	ceph_async_iput(req->r_target_inode);

	if (req->r_dentry)

		dput(req->r_dentry);

	if (req->r_old_dentry)
@@ -708,7 +709,7 @@ void ceph_mdsc_release_request(struct kref *kref) 
		 */

		ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),

				  CEPH_CAP_PIN);

		iput(req->r_old_dentry_dir);

		ceph_async_iput(req->r_old_dentry_dir);

	}

	kfree(req->r_path1);

	kfree(req->r_path2);
@@ -818,7 +819,8 @@ static void __unregister_request(struct ceph_mds_client *mdsc, 
	}



	if (req->r_unsafe_dir) {

		iput(req->r_unsafe_dir);

		/* avoid calling iput_final() in mds dispatch threads */

		ceph_async_iput(req->r_unsafe_dir);

		req->r_unsafe_dir = NULL;

	}
@@ -983,7 +985,7 @@ static int __choose_mds(struct ceph_mds_client *mdsc, 
		cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);

	if (!cap) {

		spin_unlock(&ci->i_ceph_lock);

		iput(inode);

		ceph_async_iput(inode);

		goto random;

	}

	mds = cap->session->s_mds;
@@ -992,7 +994,9 @@ static int __choose_mds(struct ceph_mds_client *mdsc, 
	     cap == ci->i_auth_cap ? "auth " : "", cap);

	spin_unlock(&ci->i_ceph_lock);

out:

	iput(inode);

	/* avoid calling iput_final() while holding mdsc->mutex or

	 * in mds dispatch threads */

	ceph_async_iput(inode);

	return mds;



random:
@@ -1302,7 +1306,9 @@ int ceph_iterate_session_caps(struct ceph_mds_session *session, 
		spin_unlock(&session->s_cap_lock);



		if (last_inode) {

			iput(last_inode);

			/* avoid calling iput_final() while holding

			 * s_mutex or in mds dispatch threads */

			ceph_async_iput(last_inode);

			last_inode = NULL;

		}

		if (old_cap) {
@@ -1335,7 +1341,7 @@ int ceph_iterate_session_caps(struct ceph_mds_session *session, 
	session->s_cap_iterator = NULL;

	spin_unlock(&session->s_cap_lock);



	iput(last_inode);

	ceph_async_iput(last_inode);

	if (old_cap)

		ceph_put_cap(session->s_mdsc, old_cap);
@@ -1471,7 +1477,8 @@ static void remove_session_caps(struct ceph_mds_session *session) 
			spin_unlock(&session->s_cap_lock);



			inode = ceph_find_inode(sb, vino);

			iput(inode);

			 /* avoid calling iput_final() while holding s_mutex */

			ceph_async_iput(inode);



			spin_lock(&session->s_cap_lock);

		}
@@ -3912,8 +3919,9 @@ static void handle_lease(struct ceph_mds_client *mdsc, 
	ceph_con_send(&session->s_con, msg);



out:

	iput(inode);

	mutex_unlock(&session->s_mutex);

	/* avoid calling iput_final() in mds dispatch threads */

	ceph_async_iput(inode);

	return;



bad:

fs/ceph/quota.c

+6 −3
Original line number Diff line number Diff line
@@ -74,7 +74,8 @@ void ceph_handle_quota(struct ceph_mds_client *mdsc, 
		            le64_to_cpu(h->max_files));

	spin_unlock(&ci->i_ceph_lock);



	iput(inode);

	/* avoid calling iput_final() in dispatch thread */

	ceph_async_iput(inode);

}



static struct ceph_quotarealm_inode *
@@ -235,7 +236,8 @@ static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc, 


		ci = ceph_inode(in);

		has_quota = __ceph_has_any_quota(ci);

		iput(in);

		/* avoid calling iput_final() while holding mdsc->snap_rwsem */

		ceph_async_iput(in);



		next = realm->parent;

		if (has_quota || !next)
@@ -372,7 +374,8 @@ static bool check_quota_exceeded(struct inode *inode, enum quota_check_op op, 
			pr_warn("Invalid quota check op (%d)\n", op);

			exceeded = true; /* Just break the loop */

		}

		iput(in);

		/* avoid calling iput_final() while holding mdsc->snap_rwsem */

		ceph_async_iput(in);



		next = realm->parent;

		if (exceeded || !next)