On 2017/3/14 9:37, heyunlei wrote: > > Hi Jaegeuk, > On 2017/3/14 2:30, Jaegeuk Kim wrote: >> On 03/10, Yunlei He wrote: >>> If an encrypted block has been read to memory, we just dirty it >>> and return directly. >>> >>> Signed-off-by: Yunlei He <[email protected]> >>> --- >>> fs/f2fs/gc.c | 11 +++++++++-- >>> 1 file changed, 9 insertions(+), 2 deletions(-) >>> >>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c >>> index 418fd98..ca94518 100644 >>> --- a/fs/f2fs/gc.c >>> +++ b/fs/f2fs/gc.c >>> @@ -564,7 +564,7 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct >>> f2fs_summary *sum, >>> } >>> >>> static void move_encrypted_block(struct inode *inode, block_t bidx, >>> - unsigned int segno, int >>> off) >>> + int gc_type, unsigned int segno, int >>> off) >>> { >>> struct f2fs_io_info fio = { >>> .sbi = F2FS_I_SB(inode), >>> @@ -607,6 +607,12 @@ static void move_encrypted_block(struct inode *inode, >>> block_t bidx, >>> */ >>> f2fs_wait_on_page_writeback(page, DATA, true); >>> >>> + if (gc_type == BG_GC && PageUptodate(page) && >>> + fscrypt_has_encryption_key(inode)) { >> >> Why do we need the encryption key? > > Here I am afraid some cases dirty encrypted pages have no authority to write > back.
Not sure this is the right way, I suspect that user may change master key to incorrect one in keyring, then, this approach will make original data in page cache being encrypted with the wrong key and writebacked to storage even if user only have read permission? Thanks, > > Thanks. >> >> Thanks, >> >>> + set_page_dirty(page); >>> + goto put_out; >>> + } >>> + >>> get_node_info(fio.sbi, dn.nid, &ni); >>> set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version); >>> >>> @@ -827,7 +833,8 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, >>> struct f2fs_summary *sum, >>> start_bidx = start_bidx_of_node(nofs, inode) >>> + ofs_in_node; >>> if (f2fs_encrypted_inode(inode) && >>> S_ISREG(inode->i_mode)) >>> - move_encrypted_block(inode, start_bidx, segno, >>> off); >>> + move_encrypted_block(inode, start_bidx, >>> + gc_type, segno, >>> off); >>> else >>> move_data_page(inode, start_bidx, gc_type, >>> segno, off); >>> >>> -- >>> 2.10.1 >>> >>> >>> ------------------------------------------------------------------------------ >>> Announcing the Oxford Dictionaries API! The API offers world-renowned >>> dictionary content that is easy and intuitive to access. Sign up for an >>> account today to start using our lexical data to power your apps and >>> projects. Get started today and enter our developer competition. >>> http://sdm.link/oxford >>> _______________________________________________ >>> Linux-f2fs-devel mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel >> >> . >> > > > . > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
