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Commit 86b58d13 authored by Yan, Zheng's avatar Yan, Zheng Committed by Sage Weil
Browse files

ceph: initialize inode before instantiating dentry 

commit b18825a7 (Put a small type field into struct dentry::d_flags)
put a type field into struct dentry::d_flags. __d_instantiate() set the
field by checking inode->i_mode. So we should initialize inode before
instantiating dentry when handling mds reply.

Fixes: http://tracker.ceph.com/issues/6930


Signed-off-by: default avatarYan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
parent 374b1057

fs/ceph/inode.c

+58 −78
Original line number Diff line number Diff line
@@ -978,7 +978,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
	struct ceph_mds_reply_inode *ininfo;

	struct ceph_vino vino;

	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);

	int i = 0;

	int err = 0;



	dout("fill_trace %p is_dentry %d is_target %d\n", req,
@@ -1039,6 +1038,29 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
		}

	}



	if (rinfo->head->is_target) {

		vino.ino = le64_to_cpu(rinfo->targeti.in->ino);

		vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);



		in = ceph_get_inode(sb, vino);

		if (IS_ERR(in)) {

			err = PTR_ERR(in);

			goto done;

		}

		req->r_target_inode = in;



		err = fill_inode(in, &rinfo->targeti, NULL,

				session, req->r_request_started,

				(le32_to_cpu(rinfo->head->result) == 0) ?

				req->r_fmode : -1,

				&req->r_caps_reservation);

		if (err < 0) {

			pr_err("fill_inode badness %p %llx.%llx\n",

				in, ceph_vinop(in));

			goto done;

		}

	}



	/*

	 * ignore null lease/binding on snapdir ENOENT, or else we

	 * will have trouble splicing in the virtual snapdir later
@@ -1108,7 +1130,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
			     ceph_dentry(req->r_old_dentry)->offset);



			dn = req->r_old_dentry;  /* use old_dentry */

			in = dn->d_inode;

		}



		/* null dentry? */
@@ -1130,44 +1151,28 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
		}



		/* attach proper inode */

		ininfo = rinfo->targeti.in;

		vino.ino = le64_to_cpu(ininfo->ino);

		vino.snap = le64_to_cpu(ininfo->snapid);

		in = dn->d_inode;

		if (!in) {

			in = ceph_get_inode(sb, vino);

			if (IS_ERR(in)) {

				pr_err("fill_trace bad get_inode "

				       "%llx.%llx\n", vino.ino, vino.snap);

				err = PTR_ERR(in);

				d_drop(dn);

				goto done;

			}

		if (!dn->d_inode) {

			ihold(in);

			dn = splice_dentry(dn, in, &have_lease, true);

			if (IS_ERR(dn)) {

				err = PTR_ERR(dn);

				goto done;

			}

			req->r_dentry = dn;  /* may have spliced */

			ihold(in);

		} else if (ceph_ino(in) == vino.ino &&

			   ceph_snap(in) == vino.snap) {

			ihold(in);

		} else {

		} else if (dn->d_inode && dn->d_inode != in) {

			dout(" %p links to %p %llx.%llx, not %llx.%llx\n",

			     dn, in, ceph_ino(in), ceph_snap(in),

			     vino.ino, vino.snap);

			     dn, dn->d_inode, ceph_vinop(dn->d_inode),

			     ceph_vinop(in));

			have_lease = false;

			in = NULL;

		}



		if (have_lease)

			update_dentry_lease(dn, rinfo->dlease, session,

					    req->r_request_started);

		dout(" final dn %p\n", dn);

		i++;

	} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||

		   req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {

	} else if (!req->r_aborted &&

		   (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||

		    req->r_op == CEPH_MDS_OP_MKSNAP)) {

		struct dentry *dn = req->r_dentry;



		/* fill out a snapdir LOOKUPSNAP dentry */
@@ -1177,52 +1182,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
		ininfo = rinfo->targeti.in;

		vino.ino = le64_to_cpu(ininfo->ino);

		vino.snap = le64_to_cpu(ininfo->snapid);

		in = ceph_get_inode(sb, vino);

		if (IS_ERR(in)) {

			pr_err("fill_inode get_inode badness %llx.%llx\n",

			       vino.ino, vino.snap);

			err = PTR_ERR(in);

			d_delete(dn);

			goto done;

		}

		dout(" linking snapped dir %p to dn %p\n", in, dn);

		ihold(in);

		dn = splice_dentry(dn, in, NULL, true);

		if (IS_ERR(dn)) {

			err = PTR_ERR(dn);

			goto done;

		}

		req->r_dentry = dn;  /* may have spliced */

		ihold(in);

		rinfo->head->is_dentry = 1;  /* fool notrace handlers */

	}



	if (rinfo->head->is_target) {

		vino.ino = le64_to_cpu(rinfo->targeti.in->ino);

		vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);



		if (in == NULL || ceph_ino(in) != vino.ino ||

		    ceph_snap(in) != vino.snap) {

			in = ceph_get_inode(sb, vino);

			if (IS_ERR(in)) {

				err = PTR_ERR(in);

				goto done;

			}

		}

		req->r_target_inode = in;



		err = fill_inode(in,

				 &rinfo->targeti, NULL,

				 session, req->r_request_started,

				 (le32_to_cpu(rinfo->head->result) == 0) ?

				 req->r_fmode : -1,

				 &req->r_caps_reservation);

		if (err < 0) {

			pr_err("fill_inode badness %p %llx.%llx\n",

			       in, ceph_vinop(in));

			goto done;

		}

	}



done:

	dout("fill_trace done err=%d\n", err);

	return err;
@@ -1272,7 +1240,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
	struct qstr dname;

	struct dentry *dn;

	struct inode *in;

	int err = 0, i;

	int err = 0, ret, i;

	struct inode *snapdir = NULL;

	struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;

	struct ceph_dentry_info *di;
@@ -1305,6 +1273,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
			ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);

	}



	/* FIXME: release caps/leases if error occurs */

	for (i = 0; i < rinfo->dir_nr; i++) {

		struct ceph_vino vino;
@@ -1329,9 +1298,10 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
				err = -ENOMEM;

				goto out;

			}

			err = ceph_init_dentry(dn);

			if (err < 0) {

			ret = ceph_init_dentry(dn);

			if (ret < 0) {

				dput(dn);

				err = ret;

				goto out;

			}

		} else if (dn->d_inode &&
@@ -1351,9 +1321,6 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
			spin_unlock(&parent->d_lock);

		}



		di = dn->d_fsdata;

		di->offset = ceph_make_fpos(frag, i + r_readdir_offset);



		/* inode */

		if (dn->d_inode) {

			in = dn->d_inode;
@@ -1366,18 +1333,30 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
				err = PTR_ERR(in);

				goto out;

			}

			dn = splice_dentry(dn, in, NULL, false);

			if (IS_ERR(dn))

				dn = NULL;

		}



		if (fill_inode(in, &rinfo->dir_in[i], NULL, session,

			       req->r_request_started, -1,

			       &req->r_caps_reservation) < 0) {

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

			if (!dn->d_inode)

				iput(in);

			d_drop(dn);

			goto next_item;

		}

		if (dn)



		if (!dn->d_inode) {

			dn = splice_dentry(dn, in, NULL, false);

			if (IS_ERR(dn)) {

				err = PTR_ERR(dn);

				dn = NULL;

				goto next_item;

			}

		}



		di = dn->d_fsdata;

		di->offset = ceph_make_fpos(frag, i + r_readdir_offset);



		update_dentry_lease(dn, rinfo->dir_dlease[i],

				    req->r_session,

				    req->r_request_started);
@@ -1385,6 +1364,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, 
		if (dn)

			dput(dn);

	}

	if (err == 0)

		req->r_did_prepopulate = true;



out: