cregit-Linux how code gets into the kernel

Release 4.10 fs/ecryptfs/read_write.c

Directory: fs/ecryptfs
/**
 * eCryptfs: Linux filesystem encryption layer
 *
 * Copyright (C) 2007 International Business Machines Corp.
 *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <linux/fs.h>
#include <linux/pagemap.h>
#include "ecryptfs_kernel.h"

/**
 * ecryptfs_write_lower
 * @ecryptfs_inode: The eCryptfs inode
 * @data: Data to write
 * @offset: Byte offset in the lower file to which to write the data
 * @size: Number of bytes from @data to write at @offset in the lower
 *        file
 *
 * Write data to the lower file.
 *
 * Returns bytes written on success; less than zero on error
 */

int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, loff_t offset, size_t size) { struct file *lower_file; ssize_t rc; lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file; if (!lower_file) return -EIO; rc = kernel_write(lower_file, data, size, offset); mark_inode_dirty_sync(ecryptfs_inode); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
michael halcrowmichael halcrow5176.12%120.00%
tyler hickstyler hicks1420.90%240.00%
thieu lethieu le11.49%120.00%
al viroal viro11.49%120.00%
Total67100.00%5100.00%

/** * ecryptfs_write_lower_page_segment * @ecryptfs_inode: The eCryptfs inode * @page_for_lower: The page containing the data to be written to the * lower file * @offset_in_page: The offset in the @page_for_lower from which to * start writing the data * @size: The amount of data from @page_for_lower to write to the * lower file * * Determines the byte offset in the file for the given page and * offset within the page, maps the page, and makes the call to write * the contents of @page_for_lower to the lower inode. * * Returns zero on success; non-zero otherwise */
int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, struct page *page_for_lower, size_t offset_in_page, size_t size) { char *virt; loff_t offset; int rc; offset = ((((loff_t)page_for_lower->index) << PAGE_SHIFT) + offset_in_page); virt = kmap(page_for_lower); rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size); if (rc > 0) rc = 0; kunmap(page_for_lower); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
michael halcrowmichael halcrow7787.50%360.00%
tyler hickstyler hicks1011.36%120.00%
kirill a. shutemovkirill a. shutemov11.14%120.00%
Total88100.00%5100.00%

/** * ecryptfs_write * @ecryptfs_inode: The eCryptfs file into which to write * @data: Virtual address where data to write is located * @offset: Offset in the eCryptfs file at which to begin writing the * data from @data * @size: The number of bytes to write from @data * * Write an arbitrary amount of data to an arbitrary location in the * eCryptfs inode page cache. This is done on a page-by-page, and then * by an extent-by-extent, basis; individual extents are encrypted and * written to the lower page cache (via VFS writes). This function * takes care of all the address translation to locations in the lower * filesystem; it also handles truncate events, writing out zeros * where necessary. * * Returns zero on success; non-zero otherwise */
int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset, size_t size) { struct page *ecryptfs_page; struct ecryptfs_crypt_stat *crypt_stat; char *ecryptfs_page_virt; loff_t ecryptfs_file_size = i_size_read(ecryptfs_inode); loff_t data_offset = 0; loff_t pos; int rc = 0; crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; /* * if we are writing beyond current size, then start pos * at the current size - we'll fill in zeros from there. */ if (offset > ecryptfs_file_size) pos = ecryptfs_file_size; else pos = offset; while (pos < (offset + size)) { pgoff_t ecryptfs_page_idx = (pos >> PAGE_SHIFT); size_t start_offset_in_page = (pos & ~PAGE_MASK); size_t num_bytes = (PAGE_SIZE - start_offset_in_page); loff_t total_remaining_bytes = ((offset + size) - pos); if (fatal_signal_pending(current)) { rc = -EINTR; break; } if (num_bytes > total_remaining_bytes) num_bytes = total_remaining_bytes; if (pos < offset) { /* remaining zeros to write, up to destination offset */ loff_t total_remaining_zeros = (offset - pos); if (num_bytes > total_remaining_zeros) num_bytes = total_remaining_zeros; } ecryptfs_page = ecryptfs_get_locked_page(ecryptfs_inode, ecryptfs_page_idx); if (IS_ERR(ecryptfs_page)) { rc = PTR_ERR(ecryptfs_page); printk(KERN_ERR "%s: Error getting page at " "index [%ld] from eCryptfs inode " "mapping; rc = [%d]\n", __func__, ecryptfs_page_idx, rc); goto out; } ecryptfs_page_virt = kmap_atomic(ecryptfs_page); /* * pos: where we're now writing, offset: where the request was * If current pos is before request, we are filling zeros * If we are at or beyond request, we are writing the *data* * If we're in a fresh page beyond eof, zero it in either case */ if (pos < offset || !start_offset_in_page) { /* We are extending past the previous end of the file. * Fill in zero values to the end of the page */ memset(((char *)ecryptfs_page_virt + start_offset_in_page), 0, PAGE_SIZE - start_offset_in_page); } /* pos >= offset, we are now writing the data request */ if (pos >= offset) { memcpy(((char *)ecryptfs_page_virt + start_offset_in_page), (data + data_offset), num_bytes); data_offset += num_bytes; } kunmap_atomic(ecryptfs_page_virt); flush_dcache_page(ecryptfs_page); SetPageUptodate(ecryptfs_page); unlock_page(ecryptfs_page); if (crypt_stat->flags & ECRYPTFS_ENCRYPTED) rc = ecryptfs_encrypt_page(ecryptfs_page); else rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, ecryptfs_page, start_offset_in_page, data_offset); put_page(ecryptfs_page); if (rc) { printk(KERN_ERR "%s: Error encrypting " "page; rc = [%d]\n", __func__, rc); goto out; } pos += num_bytes; } if (pos > ecryptfs_file_size) { i_size_write(ecryptfs_inode, pos); if (crypt_stat->flags & ECRYPTFS_ENCRYPTED) { int rc2; rc2 = ecryptfs_write_inode_size_to_metadata( ecryptfs_inode); if (rc2) { printk(KERN_ERR "Problem with " "ecryptfs_write_inode_size_to_metadata; " "rc = [%d]\n", rc2); if (!rc) rc = rc2; goto out; } } } out: return rc; }

Contributors

PersonTokensPropCommitsCommitProp
michael halcrowmichael halcrow32572.54%433.33%
tyler hickstyler hicks8218.30%216.67%
eric sandeeneric sandeen296.47%18.33%
kirill a. shutemovkirill a. shutemov51.12%18.33%
al viroal viro30.67%216.67%
harvey harrisonharvey harrison20.45%18.33%
li wangli wang20.45%18.33%
Total448100.00%12100.00%

/** * ecryptfs_read_lower * @data: The read data is stored here by this function * @offset: Byte offset in the lower file from which to read the data * @size: Number of bytes to read from @offset of the lower file and * store into @data * @ecryptfs_inode: The eCryptfs inode * * Read @size bytes of data at byte offset @offset from the lower * inode into memory location @data. * * Returns bytes read on success; 0 on EOF; less than zero on error */
int ecryptfs_read_lower(char *data, loff_t offset, size_t size, struct inode *ecryptfs_inode) { struct file *lower_file; lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file; if (!lower_file) return -EIO; return kernel_read(lower_file, offset, data, size); }

Contributors

PersonTokensPropCommitsCommitProp
michael halcrowmichael halcrow3563.64%133.33%
tyler hickstyler hicks1629.09%133.33%
al viroal viro47.27%133.33%
Total55100.00%3100.00%

/** * ecryptfs_read_lower_page_segment * @page_for_ecryptfs: The page into which data for eCryptfs will be * written * @offset_in_page: Offset in @page_for_ecryptfs from which to start * writing * @size: The number of bytes to write into @page_for_ecryptfs * @ecryptfs_inode: The eCryptfs inode * * Determines the byte offset in the file for the given page and * offset within the page, maps the page, and makes the call to read * the contents of @page_for_ecryptfs from the lower inode. * * Returns zero on success; non-zero otherwise */
int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, pgoff_t page_index, size_t offset_in_page, size_t size, struct inode *ecryptfs_inode) { char *virt; loff_t offset; int rc; offset = ((((loff_t)page_index) << PAGE_SHIFT) + offset_in_page); virt = kmap(page_for_ecryptfs); rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode); if (rc > 0) rc = 0; kunmap(page_for_ecryptfs); flush_dcache_page(page_for_ecryptfs); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
michael halcrowmichael halcrow8388.30%360.00%
tyler hickstyler hicks1010.64%120.00%
kirill a. shutemovkirill a. shutemov11.06%120.00%
Total94100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
michael halcrowmichael halcrow58376.01%527.78%
tyler hickstyler hicks13417.47%422.22%
eric sandeeneric sandeen293.78%15.56%
al viroal viro91.17%422.22%
kirill a. shutemovkirill a. shutemov70.91%15.56%
li wangli wang20.26%15.56%
harvey harrisonharvey harrison20.26%15.56%
thieu lethieu le10.13%15.56%
Total767100.00%18100.00%
Directory: fs/ecryptfs
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