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eCryptfs: update metadata read/write functions

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Update the metadata read/write functions and grow_file() to use the
read_write.c routines.  Do not open another lower file; use the persistent
lower file instead.  Provide a separate function for
crypto.c::ecryptfs_read_xattr_region() to get to the lower xattr without
having to go through the eCryptfs getxattr.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow
2007-10-16 01:28:10 -07:00
committed by Linus Torvalds
parent 4981e081cf
commit d7cdc5febf
5 changed files with 114 additions and 133 deletions
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101
fs/ecryptfs/inode.c
View File

@@ -153,37 +153,30 @@ out:
/**
* grow_file
* @ecryptfs_dentry: the ecryptfs dentry
* @lower_file: The lower file
* @inode: The ecryptfs inode
* @lower_inode: The lower inode
* @ecryptfs_dentry: the eCryptfs dentry
*
* This is the code which will grow the file to its correct size.
*/
static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file,
struct inode *inode, struct inode *lower_inode)
static int grow_file(struct dentry *ecryptfs_dentry)
{
int rc = 0;
struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
struct file fake_file;
struct ecryptfs_file_info tmp_file_info;
char zero_virt[] = { 0x00 };
int rc = 0;
memset(&fake_file, 0, sizeof(fake_file));
fake_file.f_path.dentry = ecryptfs_dentry;
memset(&tmp_file_info, 0, sizeof(tmp_file_info));
ecryptfs_set_file_private(&fake_file, &tmp_file_info);
ecryptfs_set_file_lower(&fake_file, lower_file);
rc = ecryptfs_fill_zeros(&fake_file, 1);
if (rc) {
ecryptfs_inode_to_private(inode)->crypt_stat.flags |=
ECRYPTFS_SECURITY_WARNING;
ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros "
"in file; rc = [%d]\n", rc);
goto out;
}
i_size_write(inode, 0);
rc = ecryptfs_write_inode_size_to_metadata(inode);
ecryptfs_inode_to_private(inode)->crypt_stat.flags |= ECRYPTFS_NEW_FILE;
out:
ecryptfs_set_file_lower(
&fake_file,
ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
i_size_write(ecryptfs_inode, 0);
rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
ECRYPTFS_NEW_FILE;
return rc;
}
@@ -197,53 +190,31 @@ out:
*/
static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
{
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
int rc = 0;
int lower_flags;
struct ecryptfs_crypt_stat *crypt_stat;
struct dentry *lower_dentry;
struct file *lower_file;
struct inode *inode, *lower_inode;
struct vfsmount *lower_mnt;
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n",
lower_dentry->d_name.name);
inode = ecryptfs_dentry->d_inode;
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
lower_flags = ((O_CREAT | O_TRUNC) & O_ACCMODE) | O_RDWR;
lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
/* Corresponding fput() at end of this function */
rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt,
lower_flags);
if (rc) {
ecryptfs_printk(KERN_ERR,
"Error opening dentry; rc = [%i]\n", rc);
goto out;
}
lower_inode = lower_dentry->d_inode;
if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
goto out_fput;
goto out;
}
crypt_stat->flags |= ECRYPTFS_NEW_FILE;
ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
rc = ecryptfs_new_file_context(ecryptfs_dentry);
if (rc) {
ecryptfs_printk(KERN_DEBUG, "Error creating new file "
"context\n");
goto out_fput;
ecryptfs_printk(KERN_ERR, "Error creating new file "
"context; rc = [%d]\n", rc);
goto out;
}
rc = ecryptfs_write_metadata(ecryptfs_dentry, lower_file);
rc = ecryptfs_write_metadata(ecryptfs_dentry);
if (rc) {
ecryptfs_printk(KERN_DEBUG, "Error writing headers\n");
goto out_fput;
printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
goto out;
}
rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode);
out_fput:
rc = ecryptfs_close_lower_file(lower_file);
rc = grow_file(ecryptfs_dentry);
if (rc)
printk(KERN_ERR "Error closing lower_file\n");
printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
out:
return rc;
}
@@ -389,8 +360,8 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
ecryptfs_set_default_sizes(crypt_stat);
rc = ecryptfs_read_and_validate_header_region(page_virt, lower_dentry,
nd->mnt);
rc = ecryptfs_read_and_validate_header_region(page_virt,
dentry->d_inode);
if (rc) {
rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry);
if (rc) {
@@ -941,7 +912,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
}
mount_crypt_stat = &ecryptfs_superblock_to_private(
dentry->d_sb)->mount_crypt_stat;
rc = ecryptfs_read_metadata(dentry, lower_file);
rc = ecryptfs_read_metadata(dentry);
if (rc) {
if (!(mount_crypt_stat->flags
& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
@@ -1002,6 +973,24 @@ out:
return rc;
}
ssize_t
ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
void *value, size_t size)
{
int rc = 0;
if (!lower_dentry->d_inode->i_op->getxattr) {
rc = -ENOSYS;
goto out;
}
mutex_lock(&lower_dentry->d_inode->i_mutex);
rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
size);
mutex_unlock(&lower_dentry->d_inode->i_mutex);
out:
return rc;
}
ssize_t
ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
size_t size)