static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
int err;
union ubifs_key key;
struct inode *inode = NULL;
struct ubifs_dent_node *dent;
struct ubifs_info *c = dir->i_sb->s_fs_info;
dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
if (dentry->d_name.len > UBIFS_MAX_NLEN)
return ERR_PTR(-ENAMETOOLONG);
dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
if (!dent)
return ERR_PTR(-ENOMEM);
dent_key_init(c, &key, dir->i_ino, &dentry->d_name);
err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
if (err) {
if (err == -ENOENT) {
dbg_gen("not found");
goto done;
}
goto out;
}
if (dbg_check_name(c, dent, &dentry->d_name)) {
err = -EINVAL;
goto out;
}
inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
if (IS_ERR(inode)) {
/*
* This should not happen. Probably the file-system needs
* checking.
*/
err = PTR_ERR(inode);
ubifs_err(c, "dead directory entry '%pd', error %d",
dentry, err);
ubifs_ro_mode(c, err);
goto out;
}
done:
kfree(dent);
/*
* Note, d_splice_alias() would be required instead if we supported
* NFS.
*/
d_add(dentry, inode);
return NULL;
out:
kfree(dent);
return ERR_PTR(err);
}
/**
* ubifs_jrn_rename - rename a directory entry.
* @c: UBIFS file-system description object
* @old_dir: parent inode of directory entry to rename
* @old_dentry: directory entry to rename
* @new_dir: parent inode of directory entry to rename
* @new_dentry: new directory entry (or directory entry to replace)
* @sync: non-zero if the write-buffer has to be synchronized
*
* Returns zero in case of success and a negative error code in case of failure.
*/
int ubifs_jrn_rename(struct ubifs_info *c, const struct inode *old_dir,
const struct dentry *old_dentry,
const struct inode *new_dir,
const struct dentry *new_dentry, int sync)
{
const struct inode *old_inode = old_dentry->d_inode;
const struct inode *new_inode = new_dentry->d_inode;
int err, dlen1, dlen2, ilen, lnum, offs, len;
int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ;
int last_reference = !!(new_inode && new_inode->i_nlink == 0);
struct ubifs_dent_node *dent, *dent2;
void *p;
union ubifs_key key;
dbg_jrn("dent '%.*s' in dir ino %lu to dent '%.*s' in dir ino %lu",
old_dentry->d_name.len, old_dentry->d_name.name,
old_dir->i_ino, new_dentry->d_name.len,
new_dentry->d_name.name, new_dir->i_ino);
ubifs_assert(ubifs_inode(old_dir)->data_len == 0);
ubifs_assert(ubifs_inode(new_dir)->data_len == 0);
dlen1 = UBIFS_DENT_NODE_SZ + new_dentry->d_name.len + 1;
dlen2 = UBIFS_DENT_NODE_SZ + old_dentry->d_name.len + 1;
if (new_inode) {
ilen = UBIFS_INO_NODE_SZ;
if (!last_reference)
ilen += ubifs_inode(new_inode)->data_len;
} else
ilen = 0;
aligned_dlen1 = ALIGN(dlen1, 8);
aligned_dlen2 = ALIGN(dlen2, 8);
len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + ALIGN(plen, 8);
if (old_dir != new_dir)
len += plen;
dent = kmalloc(len, GFP_NOFS);
if (!dent)
return -ENOMEM;
/* Make new dent */
dent->ch.node_type = UBIFS_DENT_NODE;
dent_key_init_flash(c, &dent->key, new_dir->i_ino, &new_dentry->d_name);
dent->inum = cpu_to_le64(old_inode->i_ino);
dent->type = get_dent_type(old_inode->i_mode);
dent->nlen = cpu_to_le16(new_dentry->d_name.len);
memcpy(dent->name, new_dentry->d_name.name, new_dentry->d_name.len);
dent->name[new_dentry->d_name.len] = '\0';
zero_dent_node_unused(dent);
ubifs_prep_grp_node(c, dent, dlen1, 0);
dent2 = (void *)dent + aligned_dlen1;
/* Make deletion dent */
dent2->ch.node_type = UBIFS_DENT_NODE;
dent_key_init_flash(c, &dent2->key, old_dir->i_ino,
&old_dentry->d_name);
dent2->inum = cpu_to_le64(0);
dent2->type = DT_UNKNOWN;
dent2->nlen = cpu_to_le16(old_dentry->d_name.len);
memcpy(dent2->name, old_dentry->d_name.name, old_dentry->d_name.len);
dent2->name[old_dentry->d_name.len] = '\0';
zero_dent_node_unused(dent2);
ubifs_prep_grp_node(c, dent2, dlen2, 0);
p = (void *)dent2 + aligned_dlen2;
if (new_inode) {
pack_inode(c, p, new_inode, 0, last_reference);
p += ALIGN(ilen, 8);
}
if (old_dir == new_dir)
pack_inode(c, p, old_dir, 1, 0);
else {
pack_inode(c, p, old_dir, 0, 0);
p += ALIGN(plen, 8);
pack_inode(c, p, new_dir, 1, 0);
}
err = make_reservation(c, BASEHD, len);
if (err)
goto out_free;
if (last_reference) {
err = ubifs_add_orphan(c, new_inode->i_ino);
if (err) {
release_head(c, BASEHD);
goto out_finish;
}
}
err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync);
if (!sync && !err) {
struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
ubifs_wbuf_add_ino_nolock(wbuf, new_dir->i_ino);
ubifs_wbuf_add_ino_nolock(wbuf, old_dir->i_ino);
}
release_head(c, BASEHD);
if (err)
goto out_ro;
if (new_inode)
ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
new_inode->i_ino);
dent_key_init(c, &key, new_dir->i_ino, &new_dentry->d_name);
err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, &new_dentry->d_name);
if (err)
goto out_ro;
err = ubifs_add_dirt(c, lnum, dlen2);
if (err)
goto out_ro;
dent_key_init(c, &key, old_dir->i_ino, &old_dentry->d_name);
err = ubifs_tnc_remove_nm(c, &key, &old_dentry->d_name);
if (err)
goto out_ro;
offs += aligned_dlen1 + aligned_dlen2;
if (new_inode) {
ino_key_init(c, &key, new_inode->i_ino);
err = ubifs_tnc_add(c, &key, lnum, offs, ilen);
if (err)
goto out_ro;
offs += ALIGN(ilen, 8);
}
ino_key_init(c, &key, old_dir->i_ino);
err = ubifs_tnc_add(c, &key, lnum, offs, plen);
if (err)
goto out_ro;
if (old_dir != new_dir) {
offs += ALIGN(plen, 8);
ino_key_init(c, &key, new_dir->i_ino);
err = ubifs_tnc_add(c, &key, lnum, offs, plen);
if (err)
goto out_ro;
}
finish_reservation(c);
kfree(dent);
return 0;
out_ro:
ubifs_ro_mode(c, err);
if (last_reference)
ubifs_delete_orphan(c, new_inode->i_ino);
out_finish:
finish_reservation(c);
out_free:
kfree(dent);
return err;
}
/**
* ubifs_jrn_update - update inode.
* @c: UBIFS file-system description object
* @dir: parent inode or host inode in case of extended attributes
* @nm: directory entry name
* @inode: inode
* @deletion: indicates a directory entry deletion i.e unlink or rmdir
* @sync: non-zero if the write-buffer has to be synchronized
* @xent: non-zero if the directory entry is an extended attribute entry
*
* This function updates an inode by writing a directory entry (or extended
* attribute entry), the inode itself, and the parent directory inode (or the
* host inode) to the journal.
*
* The function writes the host inode @dir last, which is important in case of
* extended attributes. Indeed, then we guarantee that if the host inode gets
* synchronized, and the write-buffer it sits in gets flushed, the extended
* attribute inode gets flushed too. And this is exactly what the user expects -
* synchronizing the host inode synchronizes its extended attributes.
* Similarly, this guarantees that if @dir is synchronized, its directory entry
* corresponding to @nm gets synchronized too.
*
* This function returns %0 on success and a negative error code on failure.
*/
int ubifs_jrn_update(struct ubifs_info *c, const struct inode *dir,
const struct qstr *nm, const struct inode *inode,
int deletion, int sync, int xent)
{
int err, dlen, ilen, len, lnum, ino_offs, dent_offs;
int aligned_dlen, aligned_ilen;
int last_reference = !!(deletion && inode->i_nlink == 0);
struct ubifs_dent_node *dent;
struct ubifs_ino_node *ino;
union ubifs_key dent_key, ino_key;
dbg_jrn("ino %lu, dent '%.*s', data len %d in dir ino %lu",
inode->i_ino, nm->len, nm->name, ubifs_inode(inode)->data_len,
dir->i_ino);
ubifs_assert(ubifs_inode(dir)->data_len == 0);
dlen = UBIFS_DENT_NODE_SZ + nm->len + 1;
ilen = UBIFS_INO_NODE_SZ;
/*
* If the last reference to the inode is being deleted, then there is no
* need to attach and write inode data, it is being deleted anyway.
*/
if (!last_reference)
ilen += ubifs_inode(inode)->data_len;
aligned_dlen = ALIGN(dlen, 8);
aligned_ilen = ALIGN(ilen, 8);
len = aligned_dlen + aligned_ilen + UBIFS_INO_NODE_SZ;
dent = kmalloc(len, GFP_NOFS);
if (!dent)
return -ENOMEM;
if (!xent) {
dent->ch.node_type = UBIFS_DENT_NODE;
dent_key_init(c, &dent_key, dir->i_ino, nm);
} else {
dent->ch.node_type = UBIFS_XENT_NODE;
xent_key_init(c, &dent_key, dir->i_ino, nm);
}
key_write(c, &dent_key, dent->key);
dent->inum = deletion ? 0 : cpu_to_le64(inode->i_ino);
dent->type = get_dent_type(inode->i_mode);
dent->nlen = cpu_to_le16(nm->len);
memcpy(dent->name, nm->name, nm->len);
dent->name[nm->len] = '\0';
zero_dent_node_unused(dent);
ubifs_prep_grp_node(c, dent, dlen, 0);
ino = (void *)dent + aligned_dlen;
pack_inode(c, ino, inode, 0, last_reference);
ino = (void *)ino + aligned_ilen;
pack_inode(c, ino, dir, 1, 0);
err = make_reservation(c, BASEHD, len);
if (err)
goto out_free;
if (last_reference) {
err = ubifs_add_orphan(c, inode->i_ino);
if (err) {
release_head(c, BASEHD);
goto out_finish;
}
}
err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, sync);
if (!sync && !err) {
struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
ubifs_wbuf_add_ino_nolock(wbuf, dir->i_ino);
}
release_head(c, BASEHD);
kfree(dent);
if (err)
goto out_ro;
if (deletion) {
err = ubifs_tnc_remove_nm(c, &dent_key, nm);
if (err)
goto out_ro;
err = ubifs_add_dirt(c, lnum, dlen);
} else
err = ubifs_tnc_add_nm(c, &dent_key, lnum, dent_offs, dlen, nm);
if (err)
goto out_ro;
/*
* Note, we do not remove the inode from TNC even if the last reference
* to it has just been deleted, because the inode may still be opened.
* Instead, the inode has been added to orphan lists and the orphan
* subsystem will take further care about it.
*/
ino_key_init(c, &ino_key, inode->i_ino);
ino_offs = dent_offs + aligned_dlen;
err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, ilen);
if (err)
goto out_ro;
ino_key_init(c, &ino_key, dir->i_ino);
ino_offs += aligned_ilen;
err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, UBIFS_INO_NODE_SZ);
if (err)
goto out_ro;
finish_reservation(c);
return 0;
out_finish:
finish_reservation(c);
out_free:
kfree(dent);
return err;
out_ro:
ubifs_ro_mode(c, err);
if (last_reference)
ubifs_delete_orphan(c, inode->i_ino);
finish_reservation(c);
return err;
}
static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
int err;
union ubifs_key key;
struct inode *inode = NULL;
struct ubifs_dent_node *dent;
struct ubifs_info *c = dir->i_sb->s_fs_info;
struct fscrypt_name nm;
dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
if (ubifs_crypt_is_encrypted(dir)) {
err = fscrypt_get_encryption_info(dir);
/*
* DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
* created while the directory was encrypted and we
* have access to the key.
*/
if (fscrypt_has_encryption_key(dir))
fscrypt_set_encrypted_dentry(dentry);
fscrypt_set_d_op(dentry);
if (err && err != -ENOKEY)
return ERR_PTR(err);
}
err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
if (err)
return ERR_PTR(err);
if (fname_len(&nm) > UBIFS_MAX_NLEN) {
err = -ENAMETOOLONG;
goto out_fname;
}
dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
if (!dent) {
err = -ENOMEM;
goto out_fname;
}
if (nm.hash) {
ubifs_assert(fname_len(&nm) == 0);
ubifs_assert(fname_name(&nm) == NULL);
dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
} else {
dent_key_init(c, &key, dir->i_ino, &nm);
err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
}
if (err) {
if (err == -ENOENT) {
dbg_gen("not found");
goto done;
}
goto out_dent;
}
if (dbg_check_name(c, dent, &nm)) {
err = -EINVAL;
goto out_dent;
}
inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
if (IS_ERR(inode)) {
/*
* This should not happen. Probably the file-system needs
* checking.
*/
err = PTR_ERR(inode);
ubifs_err(c, "dead directory entry '%pd', error %d",
dentry, err);
ubifs_ro_mode(c, err);
goto out_dent;
}
if (ubifs_crypt_is_encrypted(dir) &&
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
!fscrypt_has_permitted_context(dir, inode)) {
ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
dir->i_ino, inode->i_ino);
err = -EPERM;
goto out_inode;
}
done:
kfree(dent);
fscrypt_free_filename(&nm);
/*
* Note, d_splice_alias() would be required instead if we supported
* NFS.
*/
d_add(dentry, inode);
return NULL;
out_inode:
iput(inode);
out_dent:
kfree(dent);
out_fname:
fscrypt_free_filename(&nm);
return ERR_PTR(err);
}
