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Commit 1cd3935b authored by Sage Weil's avatar Sage Weil
Browse files

ceph: set dn offset when spliced 



We want to assign an offset when the dentry goes from null to linked, which
is always done by splice_dentry().  Notably, we should NOT assign an
offset when a dentry is first created and is still null.

BUG if we try to splice a non-null dentry (we shouldn't).

Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent 1b7facc4

fs/ceph/dir.c

+7 −6
Original line number Diff line number Diff line
@@ -128,7 +128,8 @@ static int __dcache_readdir(struct file *filp, 
	dentry = list_entry(p, struct dentry, d_u.d_child);

	di = ceph_dentry(dentry);

	while (1) {

		dout(" p %p/%p d_subdirs %p/%p\n", p->prev, p->next,

		dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,

		     d_unhashed(dentry) ? "!hashed" : "hashed",

		     parent->d_subdirs.prev, parent->d_subdirs.next);

		if (p == &parent->d_subdirs) {

			fi->at_end = 1;
@@ -571,7 +572,6 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 
		    !is_root_ceph_dentry(dir, dentry) &&

		    (ci->i_ceph_flags & CEPH_I_COMPLETE) &&

		    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {

			di->offset = ci->i_max_offset++;

			spin_unlock(&dir->i_lock);

			dout(" dir %p complete, -ENOENT\n", dir);

			d_add(dentry, NULL);
@@ -984,8 +984,9 @@ static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) 
{

	struct inode *dir = dentry->d_parent->d_inode;



	dout("d_revalidate %p '%.*s' inode %p\n", dentry,

	     dentry->d_name.len, dentry->d_name.name, dentry->d_inode);

	dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,

	     dentry->d_name.len, dentry->d_name.name, dentry->d_inode,

	     ceph_dentry(dentry)->offset);



	/* always trust cached snapped dentries, snapdir dentry */

	if (ceph_snap(dir) != CEPH_NOSNAP) {
@@ -1177,8 +1178,8 @@ void ceph_dentry_lru_touch(struct dentry *dn) 
	struct ceph_dentry_info *di = ceph_dentry(dn);

	struct ceph_mds_client *mdsc;



	dout("dentry_lru_touch %p %p '%.*s'\n", di, dn,

	     dn->d_name.len, dn->d_name.name);

	dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,

	     dn->d_name.len, dn->d_name.name, di->offset);

	if (di) {

		mdsc = &ceph_sb_to_client(dn->d_sb)->mdsc;

		spin_lock(&mdsc->dentry_lru_lock);

fs/ceph/inode.c

+37 −34
Original line number Diff line number Diff line
@@ -803,6 +803,37 @@ static void update_dentry_lease(struct dentry *dentry, 
	return;

}



/*

 * Set dentry's directory position based on the current dir's max, and

 * order it in d_subdirs, so that dcache_readdir behaves.

 */

static void ceph_set_dentry_offset(struct dentry *dn)

{

	struct dentry *dir = dn->d_parent;

	struct inode *inode = dn->d_parent->d_inode;

	struct ceph_dentry_info *di;



	BUG_ON(!inode);



	di = ceph_dentry(dn);



	spin_lock(&inode->i_lock);

	if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {

		spin_unlock(&inode->i_lock);

		return;

	}

	di->offset = ceph_inode(inode)->i_max_offset++;

	spin_unlock(&inode->i_lock);



	spin_lock(&dcache_lock);

	spin_lock(&dn->d_lock);

	list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);

	dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,

	     dn->d_u.d_child.prev, dn->d_u.d_child.next);

	spin_unlock(&dn->d_lock);

	spin_unlock(&dcache_lock);

}



/*

 * splice a dentry to an inode.

 * caller must hold directory i_mutex for this to be safe.
@@ -816,6 +847,8 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 
{

	struct dentry *realdn;



	BUG_ON(dn->d_inode);



	/* dn must be unhashed */

	if (!d_unhashed(dn))

		d_drop(dn);
@@ -837,47 +870,16 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 
		dn = realdn;

	} else {

		BUG_ON(!ceph_dentry(dn));



		dout("dn %p attached to %p ino %llx.%llx\n",

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

	}

	if ((!prehash || *prehash) && d_unhashed(dn))

		d_rehash(dn);

	ceph_set_dentry_offset(dn);

out:

	return dn;

}



/*

 * Set dentry's directory position based on the current dir's max, and

 * order it in d_subdirs, so that dcache_readdir behaves.

 */

static void ceph_set_dentry_offset(struct dentry *dn)

{

	struct dentry *dir = dn->d_parent;

	struct inode *inode = dn->d_parent->d_inode;

	struct ceph_dentry_info *di;



	BUG_ON(!inode);



	di = ceph_dentry(dn);



	spin_lock(&inode->i_lock);

	if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {

		spin_unlock(&inode->i_lock);

		return;

	}

	di->offset = ceph_inode(inode)->i_max_offset++;

	spin_unlock(&inode->i_lock);



	spin_lock(&dcache_lock);

	spin_lock(&dn->d_lock);

	list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);

	dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,

	     dn->d_u.d_child.prev, dn->d_u.d_child.next);

	spin_unlock(&dn->d_lock);

	spin_unlock(&dcache_lock);

}



/*

 * Incorporate results into the local cache.  This is either just

 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
@@ -1030,6 +1032,9 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
			ceph_invalidate_dentry_lease(dn);



			/* take overwritten dentry's readdir offset */

			dout("dn %p gets %p offset %lld (old offset %lld)\n",

			     req->r_old_dentry, dn, ceph_dentry(dn)->offset,

			     ceph_dentry(req->r_old_dentry)->offset);

			ceph_dentry(req->r_old_dentry)->offset =

				ceph_dentry(dn)->offset;
@@ -1074,7 +1079,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
				goto done;

			}

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

			ceph_set_dentry_offset(dn);

			igrab(in);

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

			   ceph_snap(in) == vino.snap) {
@@ -1117,7 +1121,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 
			err = PTR_ERR(dn);

			goto done;

		}

		ceph_set_dentry_offset(dn);

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

		igrab(in);

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