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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…
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…/git/ecryptfs/ecryptfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  eCryptfs: Copy up lower inode attrs in getattr
  ecryptfs: read on a directory should return EISDIR if not supported
  eCryptfs: Handle NULL nameidata pointers
  eCryptfs: Revert "dont call lookup_one_len to avoid NULL nameidata"
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@torvalds
torvalds committed Feb 22, 2011
2 parents 951f351 + 55f9cf6 commit 3b71710
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Showing 4 changed files with 44 additions and 120 deletions.
22 changes: 13 additions & 9 deletions fs/ecryptfs/dentry.c
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Original file line number Diff line number Diff line change
Expand Up @@ -46,24 +46,28 @@ static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct dentry *lower_dentry;
struct vfsmount *lower_mnt;
struct dentry *dentry_save;
struct vfsmount *vfsmount_save;
struct dentry *dentry_save = NULL;
struct vfsmount *vfsmount_save = NULL;
int rc = 1;

if (nd->flags & LOOKUP_RCU)
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;

lower_dentry = ecryptfs_dentry_to_lower(dentry);
lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
goto out;
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
if (nd) {
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
}
rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
if (nd) {
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
}
if (dentry->d_inode) {
struct inode *lower_inode =
ecryptfs_inode_to_lower(dentry->d_inode);
Expand Down
3 changes: 1 addition & 2 deletions fs/ecryptfs/ecryptfs_kernel.h
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Original file line number Diff line number Diff line change
Expand Up @@ -632,8 +632,7 @@ int ecryptfs_interpose(struct dentry *hidden_dentry,
u32 flags);
int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
struct dentry *lower_dentry,
struct inode *ecryptfs_dir_inode,
struct nameidata *ecryptfs_nd);
struct inode *ecryptfs_dir_inode);
int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
size_t *decrypted_name_size,
struct dentry *ecryptfs_dentry,
Expand Down
1 change: 1 addition & 0 deletions fs/ecryptfs/file.c
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Original file line number Diff line number Diff line change
Expand Up @@ -317,6 +317,7 @@ ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

const struct file_operations ecryptfs_dir_fops = {
.readdir = ecryptfs_readdir,
.read = generic_read_dir,
.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ecryptfs_compat_ioctl,
Expand Down
138 changes: 29 additions & 109 deletions fs/ecryptfs/inode.c
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Original file line number Diff line number Diff line change
Expand Up @@ -74,16 +74,20 @@ ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
unsigned int flags_save;
int rc;

dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
flags_save = nd->flags;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
nd->flags &= ~LOOKUP_OPEN;
if (nd) {
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
flags_save = nd->flags;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
nd->flags &= ~LOOKUP_OPEN;
}
rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
nd->flags = flags_save;
if (nd) {
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
nd->flags = flags_save;
}
return rc;
}

Expand Down Expand Up @@ -241,8 +245,7 @@ ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
*/
int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
struct dentry *lower_dentry,
struct inode *ecryptfs_dir_inode,
struct nameidata *ecryptfs_nd)
struct inode *ecryptfs_dir_inode)
{
struct dentry *lower_dir_dentry;
struct vfsmount *lower_mnt;
Expand Down Expand Up @@ -290,8 +293,6 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
goto out;
if (special_file(lower_inode->i_mode))
goto out;
if (!ecryptfs_nd)
goto out;
/* Released in this function */
page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
if (!page_virt) {
Expand Down Expand Up @@ -348,75 +349,6 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
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
Expand All @@ -434,7 +366,6 @@ 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;

if ((ecryptfs_dentry->d_name.len == 1
Expand All @@ -444,20 +375,14 @@ 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);
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_dir_dentry->d_inode, &lower_name);
if (rc < 0)
goto out_d_drop;
}
lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
lower_dir_dentry, &lower_name);
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);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
"[%d] on lower_dentry = [%s]\n", __func__, rc,
encrypted_and_encoded_name);
goto out_d_drop;
Expand All @@ -479,28 +404,21 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
"filename; rc = [%d]\n", __func__, rc);
goto out_d_drop;
}
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_dir_dentry->d_inode, &lower_name);
if (rc < 0)
goto out_d_drop;
}
lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
lower_dir_dentry, &lower_name);
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);
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
"[%d] on lower_dentry = [%s]\n", __func__, rc,
encrypted_and_encoded_name);
goto out_d_drop;
}
lookup_and_interpose:
rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
ecryptfs_dir_inode,
ecryptfs_nd);
ecryptfs_dir_inode);
goto out;
out_d_drop:
d_drop(ecryptfs_dentry);
Expand Down Expand Up @@ -1092,6 +1010,8 @@ int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
ecryptfs_dentry_to_lower(dentry), &lower_stat);
if (!rc) {
fsstack_copy_attr_all(dentry->d_inode,
ecryptfs_inode_to_lower(dentry->d_inode));
generic_fillattr(dentry->d_inode, stat);
stat->blocks = lower_stat.blocks;
}
Expand Down

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