For the case of Block size < Page size, this commit computes the block
number of the first block mapped by the page. This is required by
fscrypt_encrypt_page() for encrypting the blocks mapped by the page.
Signed-off-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
---
fs/ext4/page-io.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index db75901..52f9218 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -480,10 +480,14 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode) &&
nr_to_submit) {
gfp_t gfp_flags = GFP_NOFS;
+ u64 blk_nr;
+
+ blk_nr = page->index << (PAGE_SHIFT - inode->i_blkbits);
retry_encrypt:
- data_page = fscrypt_encrypt_page(inode, page, PAGE_SIZE, 0,
- page->index, gfp_flags);
+ len = roundup(len, i_blocksize(inode));
+ data_page = fscrypt_encrypt_page(inode, page, len, 0, blk_nr,
+ gfp_flags);
if (IS_ERR(data_page)) {
ret = PTR_ERR(data_page);
if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) {
@@ -520,7 +524,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
/* Error stopped previous loop? Clean up buffers... */
if (ret) {
out:
- if (data_page)
+ if (data_page && bh == head)
fscrypt_restore_control_page(data_page);
printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret);
redirty_page_for_writepage(wbc, page);
--
2.9.5
