| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| 386 | 41.96% | 14 | 42.42% | |
| 213 | 23.15% | 7 | 21.21% | |
| 116 | 12.61% | 1 | 3.03% | |
| 101 | 10.98% | 5 | 15.15% | |
| 98 | 10.65% | 1 | 3.03% | |
| 2 | 0.22% | 1 | 3.03% | |
| 1 | 0.11% | 1 | 3.03% | |
| 1 | 0.11% | 1 | 3.03% | |
| 1 | 0.11% | 1 | 3.03% | |
| 1 | 0.11% | 1 | 3.03% | |
| Total | 920 | 33 |
| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Eric Biggers | 386 | 41.96% | 14 | 42.42% |
| Christoph Hellwig | 213 | 23.15% | 7 | 21.21% |
| Satya Tangirala | 116 | 12.61% | 1 | 3.03% |
| Jaegeuk Kim | 101 | 10.98% | 5 | 15.15% |
| Richard Weinberger | 98 | 10.65% | 1 | 3.03% |
| David Gstir | 2 | 0.22% | 1 | 3.03% |
| Ming Lei | 1 | 0.11% | 1 | 3.03% |
| Josef Whiter | 1 | 0.11% | 1 | 3.03% |
| Greg Kroah-Hartman | 1 | 0.11% | 1 | 3.03% |
| Theodore Y. Ts'o | 1 | 0.11% | 1 | 3.03% |
| Total | 920 | 33 |
// SPDX-License-Identifier: GPL-2.0 /* * Utility functions for file contents encryption/decryption on * block device-based filesystems. * * Copyright (C) 2015, Google, Inc. * Copyright (C) 2015, Motorola Mobility */ #include <linux/bio.h> #include <linux/export.h> #include <linux/module.h> #include <linux/namei.h> #include <linux/pagemap.h> #include "fscrypt_private.h" /** * fscrypt_decrypt_bio() - decrypt the contents of a bio * @bio: the bio to decrypt * * Decrypt the contents of a "read" bio following successful completion of the * underlying disk read. The bio must be reading a whole number of blocks of an * encrypted file directly into the page cache. If the bio is reading the * ciphertext into bounce pages instead of the page cache (for example, because * the file is also compressed, so decompression is required after decryption), * then this function isn't applicable. This function may sleep, so it must be * called from a workqueue rather than from the bio's bi_end_io callback. * * Return: %true on success; %false on failure. On failure, bio->bi_status is * also set to an error status. */ bool fscrypt_decrypt_bio(struct bio *bio) { struct folio_iter fi; bio_for_each_folio_all(fi, bio) { int err = fscrypt_decrypt_pagecache_blocks(fi.folio, fi.length, fi.offset); if (err) { bio->bi_status = errno_to_blk_status(err); return false; } } return true; } EXPORT_SYMBOL(fscrypt_decrypt_bio); struct fscrypt_zero_done { atomic_t pending; blk_status_t status; struct completion done; }; static void fscrypt_zeroout_range_done(struct fscrypt_zero_done *done) { if (atomic_dec_and_test(&done->pending)) complete(&done->done); } static void fscrypt_zeroout_range_end_io(struct bio *bio) { struct fscrypt_zero_done *done = bio->bi_private; if (bio->bi_status) cmpxchg(&done->status, 0, bio->bi_status); fscrypt_zeroout_range_done(done); bio_put(bio); } static int fscrypt_zeroout_range_inline_crypt(const struct inode *inode, pgoff_t lblk, sector_t sector, unsigned int len) { const unsigned int blockbits = inode->i_blkbits; const unsigned int blocks_per_page = 1 << (PAGE_SHIFT - blockbits); struct fscrypt_zero_done done = { .pending = ATOMIC_INIT(1), .done = COMPLETION_INITIALIZER_ONSTACK(done.done), }; while (len) { struct bio *bio; unsigned int n; bio = bio_alloc(inode->i_sb->s_bdev, BIO_MAX_VECS, REQ_OP_WRITE, GFP_NOFS); bio->bi_iter.bi_sector = sector; bio->bi_private = &done; bio->bi_end_io = fscrypt_zeroout_range_end_io; fscrypt_set_bio_crypt_ctx(bio, inode, lblk, GFP_NOFS); for (n = 0; n < BIO_MAX_VECS; n++) { unsigned int blocks_this_page = min(len, blocks_per_page); unsigned int bytes_this_page = blocks_this_page << blockbits; __bio_add_page(bio, ZERO_PAGE(0), bytes_this_page, 0); len -= blocks_this_page; lblk += blocks_this_page; sector += (bytes_this_page >> SECTOR_SHIFT); if (!len || !fscrypt_mergeable_bio(bio, inode, lblk)) break; } atomic_inc(&done.pending); blk_crypto_submit_bio(bio); } fscrypt_zeroout_range_done(&done); wait_for_completion(&done.done); return blk_status_to_errno(done.status); } /** * fscrypt_zeroout_range() - zero out a range of blocks in an encrypted file * @inode: the file's inode * @lblk: the first file logical block to zero out * @pblk: the first filesystem physical block to zero out * @len: number of blocks to zero out * * Zero out filesystem blocks in an encrypted regular file on-disk, i.e. write * ciphertext blocks which decrypt to the all-zeroes block. The blocks must be * both logically and physically contiguous. It's also assumed that the * filesystem only uses a single block device, ->s_bdev. * * Note that since each block uses a different IV, this involves writing a * different ciphertext to each block; we can't simply reuse the same one. * * Return: 0 on success; -errno on failure. */ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, sector_t pblk, unsigned int len) { const struct fscrypt_inode_info *ci = fscrypt_get_inode_info_raw(inode); const unsigned int du_bits = ci->ci_data_unit_bits; const unsigned int du_size = 1U << du_bits; const unsigned int du_per_page_bits = PAGE_SHIFT - du_bits; const unsigned int du_per_page = 1U << du_per_page_bits; u64 du_index = (u64)lblk << (inode->i_blkbits - du_bits); u64 du_remaining = (u64)len << (inode->i_blkbits - du_bits); sector_t sector = pblk << (inode->i_blkbits - SECTOR_SHIFT); struct page *pages[16]; /* write up to 16 pages at a time */ unsigned int nr_pages; unsigned int i; unsigned int offset; struct bio *bio; int ret, err; if (len == 0) return 0; if (fscrypt_inode_uses_inline_crypto(inode)) return fscrypt_zeroout_range_inline_crypt(inode, lblk, sector, len); BUILD_BUG_ON(ARRAY_SIZE(pages) > BIO_MAX_VECS); nr_pages = min_t(u64, ARRAY_SIZE(pages), (du_remaining + du_per_page - 1) >> du_per_page_bits); /* * We need at least one page for ciphertext. Allocate the first one * from a mempool, with __GFP_DIRECT_RECLAIM set so that it can't fail. * * Any additional page allocations are allowed to fail, as they only * help performance, and waiting on the mempool for them could deadlock. */ for (i = 0; i < nr_pages; i++) { pages[i] = fscrypt_alloc_bounce_page(i == 0 ? GFP_NOFS : GFP_NOWAIT); if (!pages[i]) break; } nr_pages = i; if (WARN_ON_ONCE(nr_pages <= 0)) return -EINVAL; /* This always succeeds since __GFP_DIRECT_RECLAIM is set. */ bio = bio_alloc(inode->i_sb->s_bdev, nr_pages, REQ_OP_WRITE, GFP_NOFS); do { bio->bi_iter.bi_sector = sector; i = 0; offset = 0; do { err = fscrypt_crypt_data_unit(ci, FS_ENCRYPT, du_index, ZERO_PAGE(0), pages[i], du_size, offset); if (err) goto out; du_index++; sector += 1U << (du_bits - SECTOR_SHIFT); du_remaining--; offset += du_size; if (offset == PAGE_SIZE || du_remaining == 0) { ret = bio_add_page(bio, pages[i++], offset, 0); if (WARN_ON_ONCE(ret != offset)) { err = -EIO; goto out; } offset = 0; } } while (i != nr_pages && du_remaining != 0); err = submit_bio_wait(bio); if (err) goto out; bio_reset(bio, inode->i_sb->s_bdev, REQ_OP_WRITE); } while (du_remaining != 0); err = 0; out: bio_put(bio); for (i = 0; i < nr_pages; i++) fscrypt_free_bounce_page(pages[i]); return err; } EXPORT_SYMBOL(fscrypt_zeroout_range);