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SubjectRe: [f2fs-dev] [PATCH] f2fs: make get_lock_data_page to handle encrypted inode
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On 2017/9/7 12:46, Jaegeuk Kim wrote:
> This patch refactors get_lock_data_page() to handle encryption case directly.
> In order to do that, it introduces common f2fs_submit_page_read().
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Good cleanup job.

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,

> ---
> fs/f2fs/data.c | 109 +++++++++++++++++++++++++++------------------------------
> 1 file changed, 51 insertions(+), 58 deletions(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index ee6801fdbdec..95f30f0000b6 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -456,6 +456,53 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
> return err;
> }
>
> +static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
> + unsigned nr_pages)
> +{
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> + struct fscrypt_ctx *ctx = NULL;
> + struct bio *bio;
> +
> + if (f2fs_encrypted_file(inode)) {
> + ctx = fscrypt_get_ctx(inode, GFP_NOFS);
> + if (IS_ERR(ctx))
> + return ERR_CAST(ctx);
> +
> + /* wait the page to be moved by cleaning */
> + f2fs_wait_on_block_writeback(sbi, blkaddr);
> + }
> +
> + bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES));
> + if (!bio) {
> + if (ctx)
> + fscrypt_release_ctx(ctx);
> + return ERR_PTR(-ENOMEM);
> + }
> + f2fs_target_device(sbi, blkaddr, bio);
> + bio->bi_end_io = f2fs_read_end_io;
> + bio->bi_private = ctx;
> + bio_set_op_attrs(bio, REQ_OP_READ, 0);
> +
> + return bio;
> +}
> +
> +/* This can handle encryption stuffs */
> +static int f2fs_submit_page_read(struct inode *inode, struct page *page,
> + block_t blkaddr)
> +{
> + struct bio *bio = f2fs_grab_read_bio(inode, blkaddr, 1);
> +
> + if (IS_ERR(bio))
> + return PTR_ERR(bio);
> +
> + if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
> + bio_put(bio);
> + return -EFAULT;
> + }
> + __submit_bio(F2FS_I_SB(inode), bio, DATA);
> + return 0;
> +}
> +
> static void __set_data_blkaddr(struct dnode_of_data *dn)
> {
> struct f2fs_node *rn = F2FS_NODE(dn->node_page);
> @@ -573,16 +620,6 @@ struct page *get_read_data_page(struct inode *inode, pgoff_t index,
> struct page *page;
> struct extent_info ei = {0,0,0};
> int err;
> - struct f2fs_io_info fio = {
> - .sbi = F2FS_I_SB(inode),
> - .type = DATA,
> - .op = REQ_OP_READ,
> - .op_flags = op_flags,
> - .encrypted_page = NULL,
> - };
> -
> - if (f2fs_encrypted_file(inode))
> - return read_mapping_page(mapping, index, NULL);
>
> page = f2fs_grab_cache_page(mapping, index, for_write);
> if (!page)
> @@ -623,9 +660,7 @@ struct page *get_read_data_page(struct inode *inode, pgoff_t index,
> return page;
> }
>
> - fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
> - fio.page = page;
> - err = f2fs_submit_page_bio(&fio);
> + err = f2fs_submit_page_read(inode, page, dn.data_blkaddr);
> if (err)
> goto put_err;
> return page;
> @@ -1150,35 +1185,6 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
> return ret;
> }
>
> -static struct bio *f2fs_grab_bio(struct inode *inode, block_t blkaddr,
> - unsigned nr_pages)
> -{
> - struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> - struct fscrypt_ctx *ctx = NULL;
> - struct bio *bio;
> -
> - if (f2fs_encrypted_file(inode)) {
> - ctx = fscrypt_get_ctx(inode, GFP_NOFS);
> - if (IS_ERR(ctx))
> - return ERR_CAST(ctx);
> -
> - /* wait the page to be moved by cleaning */
> - f2fs_wait_on_block_writeback(sbi, blkaddr);
> - }
> -
> - bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES));
> - if (!bio) {
> - if (ctx)
> - fscrypt_release_ctx(ctx);
> - return ERR_PTR(-ENOMEM);
> - }
> - f2fs_target_device(sbi, blkaddr, bio);
> - bio->bi_end_io = f2fs_read_end_io;
> - bio->bi_private = ctx;
> -
> - return bio;
> -}
> -
> /*
> * This function was originally taken from fs/mpage.c, and customized for f2fs.
> * Major change was from block_size == page_size in f2fs by default.
> @@ -1275,12 +1281,11 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
> bio = NULL;
> }
> if (bio == NULL) {
> - bio = f2fs_grab_bio(inode, block_nr, nr_pages);
> + bio = f2fs_grab_read_bio(inode, block_nr, nr_pages);
> if (IS_ERR(bio)) {
> bio = NULL;
> goto set_error_page;
> }
> - bio_set_op_attrs(bio, REQ_OP_READ, 0);
> }
>
> if (bio_add_page(bio, page, blocksize, 0) < blocksize)
> @@ -1989,21 +1994,9 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
> zero_user_segment(page, 0, PAGE_SIZE);
> SetPageUptodate(page);
> } else {
> - struct bio *bio;
> -
> - bio = f2fs_grab_bio(inode, blkaddr, 1);
> - if (IS_ERR(bio)) {
> - err = PTR_ERR(bio);
> - goto fail;
> - }
> - bio->bi_opf = REQ_OP_READ;
> - if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
> - bio_put(bio);
> - err = -EFAULT;
> + err = f2fs_submit_page_read(inode, page, blkaddr);
> + if (err)
> goto fail;
> - }
> -
> - __submit_bio(sbi, bio, DATA);
>
> lock_page(page);
> if (unlikely(page->mapping != mapping)) {
>

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