1 // SPDX-License-Identifier: GPL-2.0-or-later
19  * @offset: Byte offset in the lower file to which to write the data
20  * @size: Number of bytes from @data to write at @offset in the lower
28 			 loff_t offset, size_t size)  in ecryptfs_write_lower()  argument
33 	lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;  in ecryptfs_write_lower()
35 		return -EIO;  in ecryptfs_write_lower()
36 	rc = kernel_write(lower_file, data, size, &offset);  in ecryptfs_write_lower()
44  * @page_for_lower: The page containing the data to be written to the
46  * @offset_in_page: The offset in the @page_for_lower from which to
51  * Determines the byte offset in the file for the given page and
52  * offset within the page, maps the page, and makes the call to write
55  * Returns zero on success; non-zero otherwise
58 				      struct page *page_for_lower,  in ecryptfs_write_lower_page_segment()
62 	loff_t offset;  in ecryptfs_write_lower_page_segment()  local
65 	offset = ((((loff_t)page_for_lower->index) << PAGE_SHIFT)  in ecryptfs_write_lower_page_segment()
68 	rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);  in ecryptfs_write_lower_page_segment()
79  * @offset: Offset in the eCryptfs file at which to begin writing the
84  * eCryptfs inode page cache. This is done on a page-by-page, and then
85  * by an extent-by-extent, basis; individual extents are encrypted and
86  * written to the lower page cache (via VFS writes). This function
91  * Returns zero on success; non-zero otherwise
93 int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,  in ecryptfs_write()  argument
96 	struct page *ecryptfs_page;  in ecryptfs_write()
104 	crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;  in ecryptfs_write()
107 	 * at the current size - we'll fill in zeros from there.  in ecryptfs_write()
109 	if (offset > ecryptfs_file_size)  in ecryptfs_write()
112 		pos = offset;  in ecryptfs_write()
113 	while (pos < (offset + size)) {  in ecryptfs_write()
116 		size_t num_bytes = (PAGE_SIZE - start_offset_in_page);  in ecryptfs_write()
117 		loff_t total_remaining_bytes = ((offset + size) - pos);  in ecryptfs_write()
120 			rc = -EINTR;  in ecryptfs_write()
126 		if (pos < offset) {  in ecryptfs_write()
127 			/* remaining zeros to write, up to destination offset */  in ecryptfs_write()
128 			loff_t total_remaining_zeros = (offset - pos);  in ecryptfs_write()
137 			printk(KERN_ERR "%s: Error getting page at "  in ecryptfs_write()
146 		 * pos: where we're now writing, offset: where the request was  in ecryptfs_write()
149 		 * If we're in a fresh page beyond eof, zero it in either case  in ecryptfs_write()
151 		if (pos < offset || !start_offset_in_page) {  in ecryptfs_write()
153 			 * Fill in zero values to the end of the page */  in ecryptfs_write()
156 				PAGE_SIZE - start_offset_in_page);  in ecryptfs_write()
159 		/* pos >= offset, we are now writing the data request */  in ecryptfs_write()
160 		if (pos >= offset) {  in ecryptfs_write()
170 		if (crypt_stat->flags & ECRYPTFS_ENCRYPTED)  in ecryptfs_write()
180 			       "page; rc = [%d]\n", __func__, rc);  in ecryptfs_write()
187 		if (crypt_stat->flags & ECRYPTFS_ENCRYPTED) {  in ecryptfs_write()
209  * @offset: Byte offset in the lower file from which to read the data
210  * @size: Number of bytes to read from @offset of the lower file and
214  * Read @size bytes of data at byte offset @offset from the lower
219 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,  in ecryptfs_read_lower()  argument
223 	lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;  in ecryptfs_read_lower()
225 		return -EIO;  in ecryptfs_read_lower()
226 	return kernel_read(lower_file, data, size, &offset);  in ecryptfs_read_lower()
231  * @page_for_ecryptfs: The page into which data for eCryptfs will be
233  * @page_index: Page index in @page_for_ecryptfs from which to start
235  * @offset_in_page: Offset in @page_for_ecryptfs from which to start
240  * Determines the byte offset in the file for the given page and
241  * offset within the page, maps the page, and makes the call to read
244  * Returns zero on success; non-zero otherwise
246 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,  in ecryptfs_read_lower_page_segment()
252 	loff_t offset;  in ecryptfs_read_lower_page_segment()  local
255 	offset = ((((loff_t)page_index) << PAGE_SHIFT) + offset_in_page);  in ecryptfs_read_lower_page_segment()
257 	rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);  in ecryptfs_read_lower_page_segment()