eCryptfs: remove unused functions and kmem_cache

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>

1 files changed, 0 insertions, 336 deletions

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 6ae0afb238d1..4eb09c1753c6 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -57,113 +57,6 @@ struct page *ecryptfs_get1page(struct file *file, loff_t index)
 }
 
 /**
- * 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
  *
@@ -187,58 +80,6 @@ out:
 }
 
 /**
- * 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)
  *     Octets 8-15:       eCryptfs special marker
@@ -416,27 +257,6 @@ out:
         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 @@ out:
         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 @@ out:
         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;