Xiubo Li <xiubli@xxxxxxxxxx> writes:
> On 4/1/22 9:32 PM, Luís Henriques wrote:
>> When doing DIO on an encrypted node, we need to invalidate the page cache in
>> the range being written to, otherwise the cache will include invalid data.
>>
>> Signed-off-by: Luís Henriques <lhenriques@xxxxxxx>
>> ---
>> fs/ceph/file.c | 11 ++++++++++-
>> 1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> Changes since v1:
>> - Replaced truncate_inode_pages_range() by invalidate_inode_pages2_range
>> - Call fscache_invalidate with FSCACHE_INVAL_DIO_WRITE if we're doing DIO
>>
>> Note: I'm not really sure this last change is required, it doesn't really
>> affect generic/647 result, but seems to be the most correct.
>>
>> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
>> index 5072570c2203..b2743c342305 100644
>> --- a/fs/ceph/file.c
>> +++ b/fs/ceph/file.c
>> @@ -1605,7 +1605,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
>> if (ret < 0)
>> return ret;
>> - ceph_fscache_invalidate(inode, false);
>> + ceph_fscache_invalidate(inode, (iocb->ki_flags & IOCB_DIRECT));
>> ret = invalidate_inode_pages2_range(inode->i_mapping,
>> pos >> PAGE_SHIFT,
>> (pos + count - 1) >> PAGE_SHIFT);
>
> The above has already invalidated the pages, why doesn't it work ?
I suspect the reason is because later on we loop through the number of
pages, call copy_page_from_iter() and then ceph_fscrypt_encrypt_pages().
Cheers,
--
Luís
>
> -- Xiubo
>
>> @@ -1895,6 +1895,15 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
>> req->r_inode = inode;
>> req->r_mtime = mtime;
>> + if (IS_ENCRYPTED(inode) && (iocb->ki_flags & IOCB_DIRECT)) {
>> + ret = invalidate_inode_pages2_range(
>> + inode->i_mapping,
>> + write_pos >> PAGE_SHIFT,
>> + (write_pos + write_len - 1) >> PAGE_SHIFT);
>> + if (ret < 0)
>> + dout("invalidate_inode_pages2_range returned %d\n", ret);
>> + }
>> +
>> /* Set up the assertion */
>> if (rmw) {
>> /*
>>
>
