Commit 7959cf3a authored by Richard Weinberger's avatar Richard Weinberger
Browse files

ubifs: journal: Handle xattrs like files 



If an inode hosts xattrs, create deletion entries for each
inode. That way we can make sure that upon journal replay UBIFS
can find find all xattr inodes.
Otherwise it can happen that GC consumed already a LEB which contained
parts of the TNC that pointed to the xattrs and we no longer
find all xattr inodes, which will confuse the LPT and cause
space allocation issues.

Reported-by: default avatarStefan Agner <stefan@agner.ch>
Fixes: 1e51764a ("UBIFS: add new flash file system")
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 257bb924

fs/ubifs/journal.c

+49 −11
Original line number Diff line number Diff line
@@ -852,10 +852,11 @@ out_free: 
int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)

{

	int err, lnum, offs;

	struct ubifs_ino_node *ino;

	struct ubifs_ino_node *ino, *ino_start;

	struct ubifs_inode *ui = ubifs_inode(inode);

	int sync = 0, write_len, ilen = UBIFS_INO_NODE_SZ;

	int sync = 0, write_len = 0, ilen = UBIFS_INO_NODE_SZ;

	int last_reference = !inode->i_nlink;

	int kill_xattrs = ui->xattr_cnt && last_reference;

	u8 hash[UBIFS_HASH_ARR_SZ];



	dbg_jnl("ino %lu, nlink %u", inode->i_ino, inode->i_nlink);
@@ -867,14 +868,16 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode) 
	if (!last_reference) {

		ilen += ui->data_len;

		sync = IS_SYNC(inode);

	} else if (kill_xattrs) {

		write_len += UBIFS_INO_NODE_SZ * ui->xattr_cnt;

	}



	if (ubifs_authenticated(c))

		write_len = ALIGN(ilen, 8) + ubifs_auth_node_sz(c);

		write_len += ALIGN(ilen, 8) + ubifs_auth_node_sz(c);

	else

		write_len = ilen;

		write_len += ilen;



	ino = kmalloc(write_len, GFP_NOFS);

	ino_start = ino = kmalloc(write_len, GFP_NOFS);

	if (!ino)

		return -ENOMEM;
@@ -883,12 +886,47 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode) 
	if (err)

		goto out_free;



	if (kill_xattrs) {

		union ubifs_key key;

		struct fscrypt_name nm = {0};

		struct inode *xino;

		struct ubifs_dent_node *xent, *pxent = NULL;



		lowest_xent_key(c, &key, inode->i_ino);

		while (1) {

			xent = ubifs_tnc_next_ent(c, &key, &nm);

			if (IS_ERR(xent)) {

				err = PTR_ERR(xent);

				if (err == -ENOENT)

					break;



				goto out_release;

			}



			fname_name(&nm) = xent->name;

			fname_len(&nm) = le16_to_cpu(xent->nlen);



			xino = ubifs_iget(c->vfs_sb, xent->inum);

			ubifs_assert(c, ubifs_inode(xino)->xattr);



			clear_nlink(xino);

			pack_inode(c, ino, xino, 0);

			ino = (void *)ino + UBIFS_INO_NODE_SZ;

			iput(xino);



			kfree(pxent);

			pxent = xent;

			key_read(c, &xent->key, &key);

		}

		kfree(pxent);

	}



	pack_inode(c, ino, inode, 1);

	err = ubifs_node_calc_hash(c, ino, hash);

	if (err)

		goto out_release;



	err = write_head(c, BASEHD, ino, write_len, &lnum, &offs, sync);

	err = write_head(c, BASEHD, ino_start, write_len, &lnum, &offs, sync);

	if (err)

		goto out_release;

	if (!sync)
@@ -903,7 +941,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode) 
		if (err)

			goto out_ro;

		ubifs_delete_orphan(c, inode->i_ino);

		err = ubifs_add_dirt(c, lnum, ilen);

		err = ubifs_add_dirt(c, lnum, write_len);

	} else {

		union ubifs_key key;
@@ -917,7 +955,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode) 
	spin_lock(&ui->ui_lock);

	ui->synced_i_size = ui->ui_size;

	spin_unlock(&ui->ui_lock);

	kfree(ino);

	kfree(ino_start);

	return 0;



out_release:
@@ -926,7 +964,7 @@ out_ro: 
	ubifs_ro_mode(c, err);

	finish_reservation(c);

out_free:

	kfree(ino);

	kfree(ino_start);

	return err;

}
@@ -966,8 +1004,8 @@ int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode) 


	ubifs_assert(c, inode->i_nlink == 0);



	if (ui->del_cmtno != c->cmt_no)

		/* A commit happened for sure */

	if (ui->xattr_cnt || ui->del_cmtno != c->cmt_no)

		/* A commit happened for sure or inode hosts xattrs */

		return ubifs_jnl_write_inode(c, inode);



	down_read(&c->commit_sem);

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