eCryptfs: Collapse crypt_page_offset() into crypt_extent()
crypt_page_offset() simply initialized the two scatterlists and called crypt_scatterlist() so it is simple enough to move into the only function that calls it. Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
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d78de61896
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406c93df09
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@ -40,10 +40,6 @@
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#define DECRYPT 0
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#define ENCRYPT 1
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static int crypt_page_offset(struct ecryptfs_crypt_stat *crypt_stat,
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struct page *dst_page, struct page *src_page,
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int offset, int size, unsigned char *iv, int op);
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/**
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* ecryptfs_to_hex
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* @dst: Buffer to take hex character representation of contents of
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@ -436,10 +432,11 @@ static int crypt_extent(struct page *dst_page,
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pgoff_t page_index = op == ENCRYPT ? src_page->index : dst_page->index;
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loff_t extent_base;
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char extent_iv[ECRYPTFS_MAX_IV_BYTES];
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struct scatterlist src_sg, dst_sg;
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size_t extent_size = crypt_stat->extent_size;
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int rc;
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extent_base = (((loff_t)page_index)
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* (PAGE_CACHE_SIZE / crypt_stat->extent_size));
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extent_base = (((loff_t)page_index) * (PAGE_CACHE_SIZE / extent_size));
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rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
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(extent_base + extent_offset));
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if (rc) {
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@ -448,9 +445,17 @@ static int crypt_extent(struct page *dst_page,
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(unsigned long long)(extent_base + extent_offset), rc);
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goto out;
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}
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rc = crypt_page_offset(crypt_stat, dst_page, src_page,
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(extent_offset * crypt_stat->extent_size),
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crypt_stat->extent_size, extent_iv, op);
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sg_init_table(&src_sg, 1);
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sg_init_table(&dst_sg, 1);
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sg_set_page(&src_sg, src_page, extent_size,
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extent_offset * extent_size);
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sg_set_page(&dst_sg, dst_page, extent_size,
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extent_offset * extent_size);
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rc = crypt_scatterlist(crypt_stat, &dst_sg, &src_sg, extent_size,
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extent_iv, op);
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if (rc < 0) {
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printk(KERN_ERR "%s: Error attempting to crypt page with "
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"page_index = [%ld], extent_offset = [%ld]; "
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@ -588,33 +593,6 @@ out:
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return rc;
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}
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/**
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* crypt_page_offset
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* @crypt_stat: The cryptographic context
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* @dst_page: The page to write the result into
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* @src_page: The page to read from
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* @offset: The byte offset into the dst_page and src_page
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* @size: The number of bytes of data
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* @iv: The initialization vector to use for the crypto operation
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* @op: ENCRYPT or DECRYPT to indicate the desired operation
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*
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* Returns the number of bytes encrypted or decrypted
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*/
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static int crypt_page_offset(struct ecryptfs_crypt_stat *crypt_stat,
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struct page *dst_page, struct page *src_page,
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int offset, int size, unsigned char *iv, int op)
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{
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struct scatterlist src_sg, dst_sg;
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sg_init_table(&src_sg, 1);
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sg_init_table(&dst_sg, 1);
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sg_set_page(&src_sg, src_page, size, offset);
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sg_set_page(&dst_sg, dst_page, size, offset);
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return crypt_scatterlist(crypt_stat, &dst_sg, &src_sg, size, iv, op);
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}
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#define ECRYPTFS_MAX_SCATTERLIST_LEN 4
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/**
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