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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/fs/crypto/bio.c
..
..
@@ -29,9 +29,9 @@
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29
 void fscrypt_decrypt_bio(struct bio *bio)
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30
 {
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31
 	struct bio_vec *bv;
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-	int i;
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+	struct bvec_iter_all iter_all;
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33
 
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-	bio_for_each_segment_all(bv, bio, i) {
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+	bio_for_each_segment_all(bv, bio, iter_all) {
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 		struct page *page = bv->bv_page;
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 		int ret = fscrypt_decrypt_pagecache_blocks(page, bv->bv_len,
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37
 							   bv->bv_offset);
..
..
@@ -41,51 +41,48 @@
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 }
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 EXPORT_SYMBOL(fscrypt_decrypt_bio);
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43
 
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-static int fscrypt_zeroout_range_inlinecrypt(const struct inode *inode,
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-					     pgoff_t lblk,
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-					     sector_t pblk, unsigned int len)
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+static int fscrypt_zeroout_range_inline_crypt(const struct inode *inode,
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+					      pgoff_t lblk, sector_t pblk,
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+					      unsigned int len)
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47
 {
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48
 	const unsigned int blockbits = inode->i_blkbits;
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-	const unsigned int blocks_per_page_bits = PAGE_SHIFT - blockbits;
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-	const unsigned int blocks_per_page = 1 << blocks_per_page_bits;
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-	unsigned int i;
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+	const unsigned int blocks_per_page = 1 << (PAGE_SHIFT - blockbits);
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50
 	struct bio *bio;
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-	int ret, err;
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+	int ret, err = 0;
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+	int num_pages = 0;
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53
 
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 	/* This always succeeds since __GFP_DIRECT_RECLAIM is set. */
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 	bio = bio_alloc(GFP_NOFS, BIO_MAX_PAGES);
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56
 
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-	do {
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-		bio_set_dev(bio, inode->i_sb->s_bdev);
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-		bio->bi_iter.bi_sector = pblk << (blockbits - 9);
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-		bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
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-		fscrypt_set_bio_crypt_ctx(bio, inode, lblk, GFP_NOFS);
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+	while (len) {
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+		unsigned int blocks_this_page = min(len, blocks_per_page);
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+		unsigned int bytes_this_page = blocks_this_page << blockbits;
63
60
 
64
-		i = 0;
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-		do {
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-			unsigned int blocks_this_page =
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-				min(len, blocks_per_page);
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-			unsigned int bytes_this_page =
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-				blocks_this_page << blockbits;
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-
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-			ret = bio_add_page(bio, ZERO_PAGE(0),
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-					   bytes_this_page, 0);
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-			if (WARN_ON(ret != bytes_this_page)) {
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-				err = -EIO;
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-				goto out;
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-			}
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-			lblk += blocks_this_page;
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-			pblk += blocks_this_page;
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-			len -= blocks_this_page;
80
-		} while (++i != BIO_MAX_PAGES && len != 0 &&
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-			 fscrypt_mergeable_bio(bio, inode, lblk));
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-
83
-		err = submit_bio_wait(bio);
84
-		if (err)
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+		if (num_pages == 0) {
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+			fscrypt_set_bio_crypt_ctx(bio, inode, lblk, GFP_NOFS);
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+			bio_set_dev(bio, inode->i_sb->s_bdev);
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+			bio->bi_iter.bi_sector =
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+					pblk << (blockbits - SECTOR_SHIFT);
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+			bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
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+		}
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+		ret = bio_add_page(bio, ZERO_PAGE(0), bytes_this_page, 0);
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+		if (WARN_ON(ret != bytes_this_page)) {
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+			err = -EIO;
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71
 			goto out;
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-		bio_reset(bio);
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-	} while (len != 0);
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-	err = 0;
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+		}
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+		num_pages++;
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+		len -= blocks_this_page;
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+		lblk += blocks_this_page;
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+		pblk += blocks_this_page;
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+		if (num_pages == BIO_MAX_PAGES || !len ||
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+		    !fscrypt_mergeable_bio(bio, inode, lblk)) {
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+			err = submit_bio_wait(bio);
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+			if (err)
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+				goto out;
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+			bio_reset(bio);
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+			num_pages = 0;
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+		}
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+	}
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86
 out:
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87
 	bio_put(bio);
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88
 	return err;
..
..
@@ -126,8 +123,8 @@
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123
 		return 0;
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124
 
128
125
 	if (fscrypt_inode_uses_inline_crypto(inode))
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-		return fscrypt_zeroout_range_inlinecrypt(inode, lblk, pblk,
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-							 len);
126
+		return fscrypt_zeroout_range_inline_crypt(inode, lblk, pblk,
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+							  len);
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128
 
132
129
 	BUILD_BUG_ON(ARRAY_SIZE(pages) > BIO_MAX_PAGES);
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130
 	nr_pages = min_t(unsigned int, ARRAY_SIZE(pages),