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Diffstat (limited to 'fs/ecryptfs/inode.c')
-rw-r--r--fs/ecryptfs/inode.c129
1 files changed, 111 insertions, 18 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 31ef5252f0fe..3fbc94203380 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 +339,84 @@ 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
+ * @name: 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
+ * @name: lower file name
+ *
+ * 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 qstr *name)
+{
+ struct nameidata nd;
+ struct vfsmount *lower_mnt;
+ int err;
+
+ 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
@@ -363,6 +433,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
size_t encrypted_and_encoded_name_size;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
struct dentry *lower_dir_dentry, *lower_dentry;
+ struct qstr lower_name;
int rc = 0;
ecryptfs_dentry->d_op = &ecryptfs_dops;
@@ -373,14 +444,20 @@ 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_name.name = ecryptfs_dentry->d_name.name;
+ lower_name.len = ecryptfs_dentry->d_name.len;
+ lower_name.hash = ecryptfs_dentry->d_name.hash;
+ if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
+ rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
+ &lower_name);
+ if (rc < 0)
+ goto out_d_drop;
+ }
+ lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
+ lower_dir_dentry, &lower_name);
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 +479,20 @@ 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_name.name = encrypted_and_encoded_name;
+ lower_name.len = encrypted_and_encoded_name_size;
+ lower_name.hash = full_name_hash(lower_name.name, lower_name.len);
+ if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
+ rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
+ &lower_name);
+ if (rc < 0)
+ goto out_d_drop;
+ }
+ lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
+ lower_dir_dentry, &lower_name);
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 +887,20 @@ 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 +923,7 @@ 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 "
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-15 11:36:08 +0300