diff options
Diffstat (limited to 'fs/ecryptfs/inode.c')
| -rw-r--r-- | fs/ecryptfs/inode.c | 112 |
1 files changed, 94 insertions, 18 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 31ef525..6c55113 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -264,7 +264,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, printk(KERN_ERR "%s: Out of memory whilst attempting " "to allocate ecryptfs_dentry_info struct\n", __func__); - goto out_dput; + goto out_put; } ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); @@ -339,14 +339,85 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, out_free_kmem: kmem_cache_free(ecryptfs_header_cache_2, page_virt); goto out; -out_dput: +out_put: dput(lower_dentry); + mntput(lower_mnt); d_drop(ecryptfs_dentry); out: return rc; } /** + * ecryptfs_new_lower_dentry + * @ename: The name of the new dentry. + * @lower_dir_dentry: Parent directory of the new dentry. + * @nd: nameidata from last lookup. + * + * Create a new dentry or get it from lower parent dir. + */ +static struct dentry * +ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry, + struct nameidata *nd) +{ + struct dentry *new_dentry; + struct dentry *tmp; + struct inode *lower_dir_inode; + + lower_dir_inode = lower_dir_dentry->d_inode; + + tmp = d_alloc(lower_dir_dentry, name); + if (!tmp) + return ERR_PTR(-ENOMEM); + + mutex_lock(&lower_dir_inode->i_mutex); + new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd); + mutex_unlock(&lower_dir_inode->i_mutex); + + if (!new_dentry) + new_dentry = tmp; + else + dput(tmp); + + return new_dentry; +} + + +/** + * ecryptfs_lookup_one_lower + * @ecryptfs_dentry: The eCryptfs dentry that we are looking up + * @lower_dir_dentry: lower parent directory + * + * Get the lower dentry from vfs. If lower dentry does not exist yet, + * create it. + */ +static struct dentry * +ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry, + struct dentry *lower_dir_dentry) +{ + struct nameidata nd; + struct vfsmount *lower_mnt; + struct qstr *name; + int err; + + name = &ecryptfs_dentry->d_name; + lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( + ecryptfs_dentry->d_parent)); + err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd); + mntput(lower_mnt); + + if (!err) { + /* we dont need the mount */ + mntput(nd.path.mnt); + return nd.path.dentry; + } + if (err != -ENOENT) + return ERR_PTR(err); + + /* create a new lower dentry */ + return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd); +} + +/** * ecryptfs_lookup * @ecryptfs_dir_inode: The eCryptfs directory inode * @ecryptfs_dentry: The eCryptfs dentry that we are looking up @@ -373,14 +444,12 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, goto out_d_drop; } lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); - mutex_lock(&lower_dir_dentry->d_inode->i_mutex); - lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, - lower_dir_dentry, - ecryptfs_dentry->d_name.len); - mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); + + lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, + lower_dir_dentry); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); - ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " + ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " "[%d] on lower_dentry = [%s]\n", __func__, rc, encrypted_and_encoded_name); goto out_d_drop; @@ -402,14 +471,11 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, "filename; rc = [%d]\n", __func__, rc); goto out_d_drop; } - mutex_lock(&lower_dir_dentry->d_inode->i_mutex); - lower_dentry = lookup_one_len(encrypted_and_encoded_name, - lower_dir_dentry, - encrypted_and_encoded_name_size - 1); - mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); + lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, + lower_dir_dentry); if (IS_ERR(lower_dentry)) { rc = PTR_ERR(lower_dentry); - ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " + ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " "[%d] on lower_dentry = [%s]\n", __func__, rc, encrypted_and_encoded_name); goto out_d_drop; @@ -804,10 +870,20 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia, size_t num_zeros = (PAGE_CACHE_SIZE - (ia->ia_size & ~PAGE_CACHE_MASK)); + + /* + * XXX(truncate) this should really happen at the begginning + * of ->setattr. But the code is too messy to that as part + * of a larger patch. ecryptfs is also totally missing out + * on the inode_change_ok check at the beginning of + * ->setattr while would include this. + */ + rc = inode_newsize_ok(inode, ia->ia_size); + if (rc) + goto out; + if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { - rc = simple_setsize(inode, ia->ia_size); - if (rc) - goto out; + truncate_setsize(inode, ia->ia_size); lower_ia->ia_size = ia->ia_size; lower_ia->ia_valid |= ATTR_SIZE; goto out; @@ -830,7 +906,7 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia, goto out; } } - simple_setsize(inode, ia->ia_size); + truncate_setsize(inode, ia->ia_size); rc = ecryptfs_write_inode_size_to_metadata(inode); if (rc) { printk(KERN_ERR "Problem with " |