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eCryptfs: remove unused functions and kmem_cache

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The switch to read_write.c routines and the persistent file make a number of
functions unnecessary.  This patch removes them.

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 01:28:13 -07:00 committed by Linus Torvalds
parent 035241d30e
commit b6c1d8fcba
5 changed files with 1 additions and 539 deletions
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150
fs/ecryptfs/crypto.c
View File

@ -353,119 +353,6 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
return rc;
}
static void
ecryptfs_extent_to_lwr_pg_idx_and_offset(unsigned long *lower_page_idx,
int *byte_offset,
struct ecryptfs_crypt_stat *crypt_stat,
unsigned long extent_num)
{
unsigned long lower_extent_num;
int extents_occupied_by_headers_at_front;
int bytes_occupied_by_headers_at_front;
int extent_offset;
int extents_per_page;
bytes_occupied_by_headers_at_front =
(crypt_stat->extent_size
* crypt_stat->num_header_extents_at_front);
extents_occupied_by_headers_at_front =
( bytes_occupied_by_headers_at_front
/ crypt_stat->extent_size );
lower_extent_num = extents_occupied_by_headers_at_front + extent_num;
extents_per_page = PAGE_CACHE_SIZE / crypt_stat->extent_size;
(*lower_page_idx) = lower_extent_num / extents_per_page;
extent_offset = lower_extent_num % extents_per_page;
(*byte_offset) = extent_offset * crypt_stat->extent_size;
ecryptfs_printk(KERN_DEBUG, " * crypt_stat->extent_size = "
"[%d]\n", crypt_stat->extent_size);
ecryptfs_printk(KERN_DEBUG, " * crypt_stat->"
"num_header_extents_at_front = [%d]\n",
crypt_stat->num_header_extents_at_front);
ecryptfs_printk(KERN_DEBUG, " * extents_occupied_by_headers_at_"
"front = [%d]\n", extents_occupied_by_headers_at_front);
ecryptfs_printk(KERN_DEBUG, " * lower_extent_num = [0x%.16x]\n",
lower_extent_num);
ecryptfs_printk(KERN_DEBUG, " * extents_per_page = [%d]\n",
extents_per_page);
ecryptfs_printk(KERN_DEBUG, " * (*lower_page_idx) = [0x%.16x]\n",
(*lower_page_idx));
ecryptfs_printk(KERN_DEBUG, " * extent_offset = [%d]\n",
extent_offset);
ecryptfs_printk(KERN_DEBUG, " * (*byte_offset) = [%d]\n",
(*byte_offset));
}
static int ecryptfs_write_out_page(struct ecryptfs_page_crypt_context *ctx,
struct page *lower_page,
struct inode *lower_inode,
int byte_offset_in_page, int bytes_to_write)
{
int rc = 0;
if (ctx->mode == ECRYPTFS_PREPARE_COMMIT_MODE) {
rc = ecryptfs_commit_lower_page(lower_page, lower_inode,
ctx->param.lower_file,
byte_offset_in_page,
bytes_to_write);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error calling lower "
"commit; rc = [%d]\n", rc);
goto out;
}
} else {
rc = ecryptfs_writepage_and_release_lower_page(lower_page,
lower_inode,
ctx->param.wbc);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error calling lower "
"writepage(); rc = [%d]\n", rc);
goto out;
}
}
out:
return rc;
}
static int ecryptfs_read_in_page(struct ecryptfs_page_crypt_context *ctx,
struct page **lower_page,
struct inode *lower_inode,
unsigned long lower_page_idx,
int byte_offset_in_page)
{
int rc = 0;
if (ctx->mode == ECRYPTFS_PREPARE_COMMIT_MODE) {
/* TODO: Limit this to only the data extents that are
* needed */
rc = ecryptfs_get_lower_page(lower_page, lower_inode,
ctx->param.lower_file,
lower_page_idx,
byte_offset_in_page,
(PAGE_CACHE_SIZE
- byte_offset_in_page));
if (rc) {
ecryptfs_printk(
KERN_ERR, "Error attempting to grab, map, "
"and prepare_write lower page with index "
"[0x%.16x]; rc = [%d]\n", lower_page_idx, rc);
goto out;
}
} else {
*lower_page = grab_cache_page(lower_inode->i_mapping,
lower_page_idx);
if (!(*lower_page)) {
rc = -EINVAL;
ecryptfs_printk(
KERN_ERR, "Error attempting to grab and map "
"lower page with index [0x%.16x]; rc = [%d]\n",
lower_page_idx, rc);
goto out;
}
}
out:
return rc;
}
/**
* ecryptfs_lower_offset_for_extent
*
@ -1306,43 +1193,6 @@ int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code)
return rc;
}
/**
* ecryptfs_read_header_region
* @data: The virtual address to write header region data into
* @dentry: The lower dentry
* @mnt: The lower VFS mount
*
* Returns zero on success; non-zero otherwise
*/
static int ecryptfs_read_header_region(char *data, struct dentry *dentry,
struct vfsmount *mnt)
{
struct file *lower_file;
mm_segment_t oldfs;
int rc;
rc = ecryptfs_open_lower_file(&lower_file, dentry, mnt, O_RDONLY);
if (rc) {
printk(KERN_ERR
"Error opening lower_file to read header region\n");
goto out;
}
lower_file->f_pos = 0;
oldfs = get_fs();
set_fs(get_ds());
rc = lower_file->f_op->read(lower_file, (char __user *)data,
ECRYPTFS_DEFAULT_EXTENT_SIZE, &lower_file->f_pos);
set_fs(oldfs);
rc = ecryptfs_close_lower_file(lower_file);
if (rc) {
printk(KERN_ERR "Error closing lower_file\n");
goto out;
}
rc = 0;
out:
return rc;
}
int ecryptfs_read_and_validate_header_region(char *data,
struct inode *ecryptfs_inode)
{

21
fs/ecryptfs/ecryptfs_kernel.h
View File

@ -552,22 +552,7 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
void ecryptfs_destroy_mount_crypt_stat(
struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptefs_inode);
int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
struct file *lower_file,
unsigned long lower_page_index, int byte_offset,
int region_bytes);
int
ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
struct file *lower_file, int byte_offset,
int region_size);
int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
struct file *lower_file);
int ecryptfs_do_readpage(struct file *file, struct page *page,
pgoff_t lower_page_index);
int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
struct inode *lower_inode,
struct writeback_control *wbc);
int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
int ecryptfs_encrypt_page(struct page *page);
int ecryptfs_decrypt_page(struct page *page);
int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
@ -591,10 +576,6 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
int ecryptfs_open_lower_file(struct file **lower_file,
struct dentry *lower_dentry,
struct vfsmount *lower_mnt, int flags);
int ecryptfs_close_lower_file(struct file *lower_file);
ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
size_t size);
ssize_t

28
fs/ecryptfs/file.c
View File

@ -141,34 +141,6 @@ static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
struct kmem_cache *ecryptfs_file_info_cache;
int ecryptfs_open_lower_file(struct file **lower_file,
struct dentry *lower_dentry,
struct vfsmount *lower_mnt, int flags)
{
int rc = 0;
flags |= O_LARGEFILE;
dget(lower_dentry);
mntget(lower_mnt);
*lower_file = dentry_open(lower_dentry, lower_mnt, flags);
if (IS_ERR(*lower_file)) {
printk(KERN_ERR "Error opening lower file for lower_dentry "
"[0x%p], lower_mnt [0x%p], and flags [0x%x]\n",
lower_dentry, lower_mnt, flags);
rc = PTR_ERR(*lower_file);
*lower_file = NULL;
goto out;
}
out:
return rc;
}
int ecryptfs_close_lower_file(struct file *lower_file)
{
fput(lower_file);
return 0;
}
/**
* ecryptfs_open
* @inode: inode speciying file to open

5
fs/ecryptfs/main.c
View File

@ -670,11 +670,6 @@ static struct ecryptfs_cache_info {
.name = "ecryptfs_xattr_cache",
.size = PAGE_CACHE_SIZE,
},
{
.cache = &ecryptfs_lower_page_cache,
.name = "ecryptfs_lower_page_cache",
.size = PAGE_CACHE_SIZE,
},
{
.cache = &ecryptfs_key_record_cache,
.name = "ecryptfs_key_record_cache",

336
fs/ecryptfs/mmap.c
View File

@ -56,113 +56,6 @@ struct page *ecryptfs_get1page(struct file *file, loff_t index)
return read_mapping_page(mapping, index, (void *)file);
}
/**
* ecryptfs_fill_zeros
* @file: The ecryptfs file
* @new_length: The new length of the data in the underlying file;
* everything between the prior end of the file and the
* new end of the file will be filled with zero's.
* new_length must be greater than current length
*
* Function for handling lseek-ing past the end of the file.
*
* This function does not support shrinking, only growing a file.
*
* Returns zero on success; non-zero otherwise.
*/
int ecryptfs_fill_zeros(struct file *file, loff_t new_length)
{
int rc = 0;
struct dentry *dentry = file->f_path.dentry;
struct inode *inode = dentry->d_inode;
pgoff_t old_end_page_index = 0;
pgoff_t index = old_end_page_index;
int old_end_pos_in_page = -1;
pgoff_t new_end_page_index;
int new_end_pos_in_page;
loff_t cur_length = i_size_read(inode);
if (cur_length != 0) {
index = old_end_page_index =
((cur_length - 1) >> PAGE_CACHE_SHIFT);
old_end_pos_in_page = ((cur_length - 1) & ~PAGE_CACHE_MASK);
}
new_end_page_index = ((new_length - 1) >> PAGE_CACHE_SHIFT);
new_end_pos_in_page = ((new_length - 1) & ~PAGE_CACHE_MASK);
ecryptfs_printk(KERN_DEBUG, "old_end_page_index = [0x%.16x]; "
"old_end_pos_in_page = [%d]; "
"new_end_page_index = [0x%.16x]; "
"new_end_pos_in_page = [%d]\n",
old_end_page_index, old_end_pos_in_page,
new_end_page_index, new_end_pos_in_page);
if (old_end_page_index == new_end_page_index) {
/* Start and end are in the same page; we just need to
* set a portion of the existing page to zero's */
rc = ecryptfs_write_zeros(file, index,
(old_end_pos_in_page + 1),
(new_end_pos_in_page
- old_end_pos_in_page));
if (rc)
ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros("
"file=[%p], "
"index=[0x%.16x], "
"old_end_pos_in_page=[d], "
"(PAGE_CACHE_SIZE - new_end_pos_in_page"
"=[%d]"
")=[d]) returned [%d]\n", file, index,
old_end_pos_in_page,
new_end_pos_in_page,
(PAGE_CACHE_SIZE - new_end_pos_in_page),
rc);
goto out;
}
/* Fill the remainder of the previous last page with zeros */
rc = ecryptfs_write_zeros(file, index, (old_end_pos_in_page + 1),
((PAGE_CACHE_SIZE - 1) - old_end_pos_in_page));
if (rc) {
ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros(file=[%p], "
"index=[0x%.16x], old_end_pos_in_page=[d], "
"(PAGE_CACHE_SIZE - old_end_pos_in_page)=[d]) "
"returned [%d]\n", file, index,
old_end_pos_in_page,
(PAGE_CACHE_SIZE - old_end_pos_in_page), rc);
goto out;
}
index++;
while (index < new_end_page_index) {
/* Fill all intermediate pages with zeros */
rc = ecryptfs_write_zeros(file, index, 0, PAGE_CACHE_SIZE);
if (rc) {
ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros("
"file=[%p], "
"index=[0x%.16x], "
"old_end_pos_in_page=[d], "
"(PAGE_CACHE_SIZE - new_end_pos_in_page"
"=[%d]"
")=[d]) returned [%d]\n", file, index,
old_end_pos_in_page,
new_end_pos_in_page,
(PAGE_CACHE_SIZE - new_end_pos_in_page),
rc);
goto out;
}
index++;
}
/* Fill the portion at the beginning of the last new page with
* zero's */
rc = ecryptfs_write_zeros(file, index, 0, (new_end_pos_in_page + 1));
if (rc) {
ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros(file="
"[%p], index=[0x%.16x], 0, "
"new_end_pos_in_page=[%d]"
"returned [%d]\n", file, index,
new_end_pos_in_page, rc);
goto out;
}
out:
return rc;
}
/**
* ecryptfs_writepage
* @page: Page that is locked before this call is made
@ -186,58 +79,6 @@ static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc)
return rc;
}
/**
* Reads the data from the lower file file at index lower_page_index
* and copies that data into page.
*
* @param page Page to fill
* @param lower_page_index Index of the page in the lower file to get
*/
int ecryptfs_do_readpage(struct file *file, struct page *page,
pgoff_t lower_page_index)
{
int rc;
struct dentry *dentry;
struct file *lower_file;
struct dentry *lower_dentry;
struct inode *inode;
struct inode *lower_inode;
char *page_data;
struct page *lower_page = NULL;
char *lower_page_data;
const struct address_space_operations *lower_a_ops;
dentry = file->f_path.dentry;
lower_file = ecryptfs_file_to_lower(file);
lower_dentry = ecryptfs_dentry_to_lower(dentry);
inode = dentry->d_inode;
lower_inode = ecryptfs_inode_to_lower(inode);
lower_a_ops = lower_inode->i_mapping->a_ops;
lower_page = read_cache_page(lower_inode->i_mapping, lower_page_index,
(filler_t *)lower_a_ops->readpage,
(void *)lower_file);
if (IS_ERR(lower_page)) {
rc = PTR_ERR(lower_page);
lower_page = NULL;
ecryptfs_printk(KERN_ERR, "Error reading from page cache\n");
goto out;
}
page_data = kmap_atomic(page, KM_USER0);
lower_page_data = kmap_atomic(lower_page, KM_USER1);
memcpy(page_data, lower_page_data, PAGE_CACHE_SIZE);
kunmap_atomic(lower_page_data, KM_USER1);
kunmap_atomic(page_data, KM_USER0);
flush_dcache_page(page);
rc = 0;
out:
if (likely(lower_page))
page_cache_release(lower_page);
if (rc == 0)
SetPageUptodate(page);
else
ClearPageUptodate(page);
return rc;
}
/**
* Header Extent:
* Octets 0-7: Unencrypted file size (big-endian)
@ -416,27 +257,6 @@ static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
return 0;
}
/**
* eCryptfs does not currently support holes. When writing after a
* seek past the end of the file, eCryptfs fills in 0's through to the
* current location. The code to fill in the 0's to all the
* intermediate pages calls ecryptfs_prepare_write_no_truncate().
*/
static int
ecryptfs_prepare_write_no_truncate(struct file *file, struct page *page,
unsigned from, unsigned to)
{
int rc = 0;
if (from == 0 && to == PAGE_CACHE_SIZE)
goto out; /* If we are writing a full page, it will be
up to date. */
if (!PageUptodate(page))
rc = ecryptfs_do_readpage(file, page, page->index);
out:
return rc;
}
static int ecryptfs_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
@ -470,30 +290,6 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
return rc;
}
int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
struct inode *lower_inode,
struct writeback_control *wbc)
{
int rc = 0;
rc = lower_inode->i_mapping->a_ops->writepage(lower_page, wbc);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error calling lower writepage(); "
"rc = [%d]\n", rc);
goto out;
}
lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
page_cache_release(lower_page);
out:
return rc;
}
static void ecryptfs_release_lower_page(struct page *lower_page)
{
unlock_page(lower_page);
page_cache_release(lower_page);
}
/**
* ecryptfs_write_inode_size_to_header
*
@ -580,90 +376,6 @@ int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
return ecryptfs_write_inode_size_to_header(ecryptfs_inode);
}
int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
struct file *lower_file,
unsigned long lower_page_index, int byte_offset,
int region_bytes)
{
int rc = 0;
*lower_page = grab_cache_page(lower_inode->i_mapping, lower_page_index);
if (!(*lower_page)) {
rc = -EINVAL;
ecryptfs_printk(KERN_ERR, "Error attempting to grab "
"lower page with index [0x%.16x]\n",
lower_page_index);
goto out;
}
rc = lower_inode->i_mapping->a_ops->prepare_write(lower_file,
(*lower_page),
byte_offset,
region_bytes);
if (rc) {
ecryptfs_printk(KERN_ERR, "prepare_write for "
"lower_page_index = [0x%.16x] failed; rc = "
"[%d]\n", lower_page_index, rc);
ecryptfs_release_lower_page(*lower_page);
(*lower_page) = NULL;
}
out:
return rc;
}
/**
* ecryptfs_commit_lower_page
*
* Returns zero on success; non-zero on error
*/
int
ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
struct file *lower_file, int byte_offset,
int region_size)
{
int rc = 0;
rc = lower_inode->i_mapping->a_ops->commit_write(
lower_file, lower_page, byte_offset, region_size);
if (rc < 0) {
ecryptfs_printk(KERN_ERR,
"Error committing write; rc = [%d]\n", rc);
} else
rc = 0;
ecryptfs_release_lower_page(lower_page);
return rc;
}
/**
* ecryptfs_copy_page_to_lower
*
* Used for plaintext pass-through; no page index interpolation
* required.
*/
int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
struct file *lower_file)
{
int rc = 0;
struct page *lower_page;
rc = ecryptfs_get_lower_page(&lower_page, lower_inode, lower_file,
page->index, 0, PAGE_CACHE_SIZE);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error attempting to get page "
"at index [0x%.16x]\n", page->index);
goto out;
}
/* TODO: aops */
memcpy((char *)page_address(lower_page), page_address(page),
PAGE_CACHE_SIZE);
rc = ecryptfs_commit_lower_page(lower_page, lower_inode, lower_file,
0, PAGE_CACHE_SIZE);
if (rc)
ecryptfs_printk(KERN_ERR, "Error attempting to commit page "
"at index [0x%.16x]\n", page->index);
out:
return rc;
}
/**
* ecryptfs_commit_write
* @file: The eCryptfs file object
@ -721,54 +433,6 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
return rc;
}
/**
* ecryptfs_write_zeros
* @file: The ecryptfs file
* @index: The index in which we are writing
* @start: The position after the last block of data
* @num_zeros: The number of zeros to write
*
* Write a specified number of zero's to a page.
*
* (start + num_zeros) must be less than or equal to PAGE_CACHE_SIZE
*/
int
ecryptfs_write_zeros(struct file *file, pgoff_t index, int start, int num_zeros)
{
int rc = 0;
struct page *tmp_page;
tmp_page = ecryptfs_get1page(file, index);
if (IS_ERR(tmp_page)) {
ecryptfs_printk(KERN_ERR, "Error getting page at index "
"[0x%.16x]\n", index);
rc = PTR_ERR(tmp_page);
goto out;
}
rc = ecryptfs_prepare_write_no_truncate(file, tmp_page, start,
(start + num_zeros));
if (rc) {
ecryptfs_printk(KERN_ERR, "Error preparing to write zero's "
"to page at index [0x%.16x]\n",
index);
page_cache_release(tmp_page);
goto out;
}
zero_user_page(tmp_page, start, num_zeros, KM_USER0);
rc = ecryptfs_commit_write(file, tmp_page, start, start + num_zeros);
if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting to write zero's "
"to remainder of page at index [0x%.16x]\n",
index);
page_cache_release(tmp_page);
goto out;
}
rc = 0;
page_cache_release(tmp_page);
out:
return rc;
}
static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
{
int rc = 0;