diff options
Diffstat (limited to 'fs/ecryptfs/mmap.c')
| -rw-r--r-- | fs/ecryptfs/mmap.c | 39 |
1 files changed, 22 insertions, 17 deletions
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c index df4ce99d0597..2ee9a3a7b68c 100644 --- a/fs/ecryptfs/mmap.c +++ b/fs/ecryptfs/mmap.c @@ -32,6 +32,7 @@ #include <linux/file.h> #include <linux/crypto.h> #include <linux/scatterlist.h> +#include <linux/slab.h> #include <asm/unaligned.h> #include "ecryptfs_kernel.h" @@ -82,6 +83,19 @@ out: return rc; } +static void strip_xattr_flag(char *page_virt, + struct ecryptfs_crypt_stat *crypt_stat) +{ + if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) { + size_t written; + + crypt_stat->flags &= ~ECRYPTFS_METADATA_IN_XATTR; + ecryptfs_write_crypt_stat_flags(page_virt, crypt_stat, + &written); + crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; + } +} + /** * Header Extent: * Octets 0-7: Unencrypted file size (big-endian) @@ -97,19 +111,6 @@ out: * (big-endian) * Octet 26: Begin RFC 2440 authentication token packet set */ -static void set_header_info(char *page_virt, - struct ecryptfs_crypt_stat *crypt_stat) -{ - size_t written; - size_t save_num_header_bytes_at_front = - crypt_stat->num_header_bytes_at_front; - - crypt_stat->num_header_bytes_at_front = - ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE; - ecryptfs_write_header_metadata(page_virt + 20, crypt_stat, &written); - crypt_stat->num_header_bytes_at_front = - save_num_header_bytes_at_front; -} /** * ecryptfs_copy_up_encrypted_with_header @@ -135,8 +136,7 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page, * num_extents_per_page) + extent_num_in_page); size_t num_header_extents_at_front = - (crypt_stat->num_header_bytes_at_front - / crypt_stat->extent_size); + (crypt_stat->metadata_size / crypt_stat->extent_size); if (view_extent_num < num_header_extents_at_front) { /* This is a header extent */ @@ -146,9 +146,14 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page, memset(page_virt, 0, PAGE_CACHE_SIZE); /* TODO: Support more than one header extent */ if (view_extent_num == 0) { + size_t written; + rc = ecryptfs_read_xattr_region( page_virt, page->mapping->host); - set_header_info(page_virt, crypt_stat); + strip_xattr_flag(page_virt + 16, crypt_stat); + ecryptfs_write_header_metadata(page_virt + 20, + crypt_stat, + &written); } kunmap_atomic(page_virt, KM_USER0); flush_dcache_page(page); @@ -161,7 +166,7 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page, /* This is an encrypted data extent */ loff_t lower_offset = ((view_extent_num * crypt_stat->extent_size) - - crypt_stat->num_header_bytes_at_front); + - crypt_stat->metadata_size); rc = ecryptfs_read_lower_page_segment( page, (lower_offset >> PAGE_CACHE_SHIFT), |