From b6c1d8fcbadeb9bb4c3dbca57a007629d0483544 Mon Sep 17 00:00:00 2001 From: Michael Halcrow Date: Tue, 16 Oct 2007 01:28:13 -0700 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ecryptfs/crypto.c | 150 --------------- fs/ecryptfs/ecryptfs_kernel.h | 21 +-- fs/ecryptfs/file.c | 28 --- fs/ecryptfs/main.c | 5 - fs/ecryptfs/mmap.c | 336 ---------------------------------- 5 files changed, 1 insertion(+), 539 deletions(-) diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index 9408ea4841..a9ca373c61 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -353,119 +353,6 @@ out: 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) { diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index 3e52b42fba..bb92b74d66 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -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 diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index 95be9a90c5..c98c4690a7 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -141,34 +141,6 @@ retry: 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 diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index fb9d85b5c7..97e6801f72 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -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", diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c index 6ae0afb238..4eb09c1753 100644 --- a/fs/ecryptfs/mmap.c +++ b/fs/ecryptfs/mmap.c @@ -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 @@ out: 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 @@ 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; -- 2.39.5