// SPDX-License-Identifier: GPL-2.0
/*
 * fs/f2fs/inline.c
 * Copyright (c) 2013, Intel Corporation
 * Authors: Huajun Li <huajun.li@intel.com>
 *          Haicheng Li <haicheng.li@intel.com>
 */

#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/fiemap.h>

#include "f2fs.h"
#include "node.h"
#include <trace/events/f2fs.h>

static bool support_inline_data(struct inode *inode)
{
        if (f2fs_used_in_atomic_write(inode))
                return false;
        if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
                return false;
        if (i_size_read(inode) > MAX_INLINE_DATA(inode))
                return false;
        return true;
}

bool f2fs_may_inline_data(struct inode *inode)
{
        if (!support_inline_data(inode))
                return false;

        return !f2fs_post_read_required(inode);
}

static bool inode_has_blocks(struct inode *inode, struct folio *ifolio)
{
        struct f2fs_inode *ri = F2FS_INODE(ifolio);
        int i;

        if (F2FS_HAS_BLOCKS(inode))
                return true;

        for (i = 0; i < DEF_NIDS_PER_INODE; i++) {
                if (ri->i_nid[i])
                        return true;
        }
        return false;
}

bool f2fs_sanity_check_inline_data(struct inode *inode, struct folio *ifolio)
{
        if (!f2fs_has_inline_data(inode))
                return false;

        if (inode_has_blocks(inode, ifolio))
                return false;

        if (!support_inline_data(inode))
                return true;

        /*
         * used by sanity_check_inode(), when disk layout fields has not
         * been synchronized to inmem fields.
         */
        return (S_ISREG(inode->i_mode) &&
                (file_is_encrypt(inode) || file_is_verity(inode) ||
                (F2FS_I(inode)->i_flags & F2FS_COMPR_FL)));
}

bool f2fs_may_inline_dentry(struct inode *inode)
{
        if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
                return false;

        if (!S_ISDIR(inode->i_mode))
                return false;

        return true;
}

void f2fs_do_read_inline_data(struct folio *folio, struct folio *ifolio)
{
        struct inode *inode = folio->mapping->host;

        if (folio_test_uptodate(folio))
                return;

        f2fs_bug_on(F2FS_I_SB(inode), folio->index);

        folio_zero_segment(folio, MAX_INLINE_DATA(inode), folio_size(folio));

        /* Copy the whole inline data block */
        memcpy_to_folio(folio, 0, inline_data_addr(inode, ifolio),
                       MAX_INLINE_DATA(inode));
        if (!folio_test_uptodate(folio))
                folio_mark_uptodate(folio);
}

void f2fs_truncate_inline_inode(struct inode *inode, struct folio *ifolio,
                u64 from)
{
        void *addr;

        if (from >= MAX_INLINE_DATA(inode))
                return;

        addr = inline_data_addr(inode, ifolio);

        f2fs_folio_wait_writeback(ifolio, NODE, true, true);
        memset(addr + from, 0, MAX_INLINE_DATA(inode) - from);
        folio_mark_dirty(ifolio);

        if (from == 0)
                clear_inode_flag(inode, FI_DATA_EXIST);
}

int f2fs_read_inline_data(struct inode *inode, struct folio *folio)
{
        struct folio *ifolio;

        ifolio = f2fs_get_inode_folio(F2FS_I_SB(inode), inode->i_ino);
        if (IS_ERR(ifolio)) {
                folio_unlock(folio);
                return PTR_ERR(ifolio);
        }

        if (!f2fs_has_inline_data(inode)) {
                f2fs_folio_put(ifolio, true);
                return -EAGAIN;
        }

        if (folio->index)
                folio_zero_segment(folio, 0, folio_size(folio));
        else
                f2fs_do_read_inline_data(folio, ifolio);

        if (!folio_test_uptodate(folio))
                folio_mark_uptodate(folio);
        f2fs_folio_put(ifolio, true);
        folio_unlock(folio);
        return 0;
}

int f2fs_convert_inline_folio(struct dnode_of_data *dn, struct folio *folio)
{
        struct f2fs_io_info fio = {
                .sbi = F2FS_I_SB(dn->inode),
                .ino = dn->inode->i_ino,
                .type = DATA,
                .op = REQ_OP_WRITE,
                .op_flags = REQ_SYNC | REQ_PRIO,
                .folio = folio,
                .encrypted_page = NULL,
                .io_type = FS_DATA_IO,
        };
        struct node_info ni;
        int dirty, err;

        if (!f2fs_exist_data(dn->inode))
                goto clear_out;

        err = f2fs_reserve_block(dn, 0);
        if (err)
                return err;

        err = f2fs_get_node_info(fio.sbi, dn->nid, &ni, false);
        if (err) {
                f2fs_truncate_data_blocks_range(dn, 1);
                f2fs_put_dnode(dn);
                return err;
        }

        fio.version = ni.version;

        if (unlikely(dn->data_blkaddr != NEW_ADDR)) {
                f2fs_put_dnode(dn);
                set_sbi_flag(fio.sbi, SBI_NEED_FSCK);
                f2fs_warn(fio.sbi, "%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, run fsck to fix.",
                          __func__, dn->inode->i_ino, dn->data_blkaddr);
                f2fs_handle_error(fio.sbi, ERROR_INVALID_BLKADDR);
                return -EFSCORRUPTED;
        }

        f2fs_bug_on(F2FS_F_SB(folio), folio_test_writeback(folio));

        f2fs_do_read_inline_data(folio, dn->inode_folio);
        folio_mark_dirty(folio);

        /* clear dirty state */
        dirty = folio_clear_dirty_for_io(folio);

        /* write data page to try to make data consistent */
        folio_start_writeback(folio);
        fio.old_blkaddr = dn->data_blkaddr;
        set_inode_flag(dn->inode, FI_HOT_DATA);
        f2fs_outplace_write_data(dn, &fio);
        f2fs_folio_wait_writeback(folio, DATA, true, true);
        if (dirty) {
                inode_dec_dirty_pages(dn->inode);
                f2fs_remove_dirty_inode(dn->inode);
        }

        /* this converted inline_data should be recovered. */
        set_inode_flag(dn->inode, FI_APPEND_WRITE);

        /* clear inline data and flag after data writeback */
        f2fs_truncate_inline_inode(dn->inode, dn->inode_folio, 0);
        folio_clear_f2fs_inline(dn->inode_folio);
clear_out:
        stat_dec_inline_inode(dn->inode);
        clear_inode_flag(dn->inode, FI_INLINE_DATA);
        f2fs_put_dnode(dn);
        return 0;
}

int f2fs_convert_inline_inode(struct inode *inode)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct dnode_of_data dn;
        struct f2fs_lock_context lc;
        struct folio *ifolio, *folio;
        int err = 0;

        if (f2fs_hw_is_readonly(sbi) || f2fs_readonly(sbi->sb))
                return -EROFS;

        if (!f2fs_has_inline_data(inode))
                return 0;

        err = f2fs_dquot_initialize(inode);
        if (err)
                return err;

        folio = f2fs_grab_cache_folio(inode->i_mapping, 0, false);
        if (IS_ERR(folio))
                return PTR_ERR(folio);

        f2fs_lock_op(sbi, &lc);

        ifolio = f2fs_get_inode_folio(sbi, inode->i_ino);
        if (IS_ERR(ifolio)) {
                err = PTR_ERR(ifolio);
                goto out;
        }

        set_new_dnode(&dn, inode, ifolio, ifolio, 0);

        if (f2fs_has_inline_data(inode))
                err = f2fs_convert_inline_folio(&dn, folio);

        f2fs_put_dnode(&dn);
out:
        f2fs_unlock_op(sbi, &lc);

        f2fs_folio_put(folio, true);

        if (!err)
                f2fs_balance_fs(sbi, dn.node_changed);

        return err;
}

int f2fs_write_inline_data(struct inode *inode, struct folio *folio)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct folio *ifolio;

        ifolio = f2fs_get_inode_folio(sbi, inode->i_ino);
        if (IS_ERR(ifolio))
                return PTR_ERR(ifolio);

        if (!f2fs_has_inline_data(inode)) {
                f2fs_folio_put(ifolio, true);
                return -EAGAIN;
        }

        f2fs_bug_on(F2FS_I_SB(inode), folio->index);

        f2fs_folio_wait_writeback(ifolio, NODE, true, true);
        memcpy_from_folio(inline_data_addr(inode, ifolio),
                         folio, 0, MAX_INLINE_DATA(inode));
        folio_mark_dirty(ifolio);

        f2fs_clear_page_cache_dirty_tag(folio);

        set_inode_flag(inode, FI_APPEND_WRITE);
        set_inode_flag(inode, FI_DATA_EXIST);

        folio_clear_f2fs_inline(ifolio);
        f2fs_folio_put(ifolio, true);
        return 0;
}

int f2fs_recover_inline_data(struct inode *inode, struct folio *nfolio)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_inode *ri = NULL;
        void *src_addr, *dst_addr;

        /*
         * The inline_data recovery policy is as follows.
         * [prev.] [next] of inline_data flag
         *    o       o  -> recover inline_data
         *    o       x  -> remove inline_data, and then recover data blocks
         *    x       o  -> remove data blocks, and then recover inline_data
         *    x       x  -> recover data blocks
         */
        if (IS_INODE(nfolio))
                ri = F2FS_INODE(nfolio);

        if (f2fs_has_inline_data(inode) &&
                        ri && (ri->i_inline & F2FS_INLINE_DATA)) {
                struct folio *ifolio;
process_inline:
                ifolio = f2fs_get_inode_folio(sbi, inode->i_ino);
                if (IS_ERR(ifolio))
                        return PTR_ERR(ifolio);

                f2fs_folio_wait_writeback(ifolio, NODE, true, true);

                src_addr = inline_data_addr(inode, nfolio);
                dst_addr = inline_data_addr(inode, ifolio);
                memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));

                set_inode_flag(inode, FI_INLINE_DATA);
                set_inode_flag(inode, FI_DATA_EXIST);

                folio_mark_dirty(ifolio);
                f2fs_folio_put(ifolio, true);
                return 1;
        }

        if (f2fs_has_inline_data(inode)) {
                struct folio *ifolio = f2fs_get_inode_folio(sbi, inode->i_ino);
                if (IS_ERR(ifolio))
                        return PTR_ERR(ifolio);
                f2fs_truncate_inline_inode(inode, ifolio, 0);
                stat_dec_inline_inode(inode);
                clear_inode_flag(inode, FI_INLINE_DATA);
                f2fs_folio_put(ifolio, true);
        } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
                int ret;

                ret = f2fs_truncate_blocks(inode, 0, false);
                if (ret)
                        return ret;
                stat_inc_inline_inode(inode);
                goto process_inline;
        }
        return 0;
}

struct f2fs_dir_entry *f2fs_find_in_inline_dir(struct inode *dir,
                                        const struct f2fs_filename *fname,
                                        struct folio **res_folio,
                                        bool use_hash)
{
        struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
        struct f2fs_dir_entry *de;
        struct f2fs_dentry_ptr d;
        struct folio *ifolio;
        void *inline_dentry;

        ifolio = f2fs_get_inode_folio(sbi, dir->i_ino);
        if (IS_ERR(ifolio)) {
                *res_folio = ifolio;
                return NULL;
        }

        inline_dentry = inline_data_addr(dir, ifolio);

        make_dentry_ptr_inline(dir, &d, inline_dentry);
        de = f2fs_find_target_dentry(&d, fname, NULL, use_hash);
        folio_unlock(ifolio);
        if (IS_ERR(de)) {
                *res_folio = ERR_CAST(de);
                de = NULL;
        }
        if (de)
                *res_folio = ifolio;
        else
                f2fs_folio_put(ifolio, false);

        return de;
}

int f2fs_make_empty_inline_dir(struct inode *inode, struct inode *parent,
                                                        struct folio *ifolio)
{
        struct f2fs_dentry_ptr d;
        void *inline_dentry;

        inline_dentry = inline_data_addr(inode, ifolio);

        make_dentry_ptr_inline(inode, &d, inline_dentry);
        f2fs_do_make_empty_dir(inode, parent, &d);

        folio_mark_dirty(ifolio);

        /* update i_size to MAX_INLINE_DATA */
        if (i_size_read(inode) < MAX_INLINE_DATA(inode))
                f2fs_i_size_write(inode, MAX_INLINE_DATA(inode));
        return 0;
}

/*
 * NOTE: ipage is grabbed by caller, but if any error occurs, we should
 * release ipage in this function.
 */
static int f2fs_move_inline_dirents(struct inode *dir, struct folio *ifolio,
                                                        void *inline_dentry)
{
        struct folio *folio;
        struct dnode_of_data dn;
        struct f2fs_dentry_block *dentry_blk;
        struct f2fs_dentry_ptr src, dst;
        int err;

        folio = f2fs_grab_cache_folio(dir->i_mapping, 0, true);
        if (IS_ERR(folio)) {
                f2fs_folio_put(ifolio, true);
                return PTR_ERR(folio);
        }

        set_new_dnode(&dn, dir, ifolio, NULL, 0);
        err = f2fs_reserve_block(&dn, 0);
        if (err)
                goto out;

        if (unlikely(dn.data_blkaddr != NEW_ADDR)) {
                f2fs_put_dnode(&dn);
                set_sbi_flag(F2FS_F_SB(folio), SBI_NEED_FSCK);
                f2fs_warn(F2FS_F_SB(folio), "%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, run fsck to fix.",
                          __func__, dir->i_ino, dn.data_blkaddr);
                f2fs_handle_error(F2FS_F_SB(folio), ERROR_INVALID_BLKADDR);
                err = -EFSCORRUPTED;
                goto out;
        }

        f2fs_folio_wait_writeback(folio, DATA, true, true);

        dentry_blk = folio_address(folio);

        /*
         * Start by zeroing the full block, to ensure that all unused space is
         * zeroed and no uninitialized memory is leaked to disk.
         */
        memset(dentry_blk, 0, F2FS_BLKSIZE);

        make_dentry_ptr_inline(dir, &src, inline_dentry);
        make_dentry_ptr_block(dir, &dst, dentry_blk);

        /* copy data from inline dentry block to new dentry block */
        memcpy(dst.bitmap, src.bitmap, src.nr_bitmap);
        memcpy(dst.dentry, src.dentry, SIZE_OF_DIR_ENTRY * src.max);
        memcpy(dst.filename, src.filename, src.max * F2FS_SLOT_LEN);

        if (!folio_test_uptodate(folio))
                folio_mark_uptodate(folio);
        folio_mark_dirty(folio);

        /* clear inline dir and flag after data writeback */
        f2fs_truncate_inline_inode(dir, ifolio, 0);

        stat_dec_inline_dir(dir);
        clear_inode_flag(dir, FI_INLINE_DENTRY);

        /*
         * should retrieve reserved space which was used to keep
         * inline_dentry's structure for backward compatibility.
         */
        if (!f2fs_sb_has_flexible_inline_xattr(F2FS_I_SB(dir)) &&
                        !f2fs_has_inline_xattr(dir))
                F2FS_I(dir)->i_inline_xattr_size = 0;

        f2fs_i_depth_write(dir, 1);
        if (i_size_read(dir) < PAGE_SIZE)
                f2fs_i_size_write(dir, PAGE_SIZE);
out:
        f2fs_folio_put(folio, true);
        return err;
}

static int f2fs_add_inline_entries(struct inode *dir, void *inline_dentry)
{
        struct f2fs_dentry_ptr d;
        unsigned long bit_pos = 0;
        int err = 0;

        make_dentry_ptr_inline(dir, &d, inline_dentry);

        while (bit_pos < d.max) {
                struct f2fs_dir_entry *de;
                struct f2fs_filename fname;
                nid_t ino;
                umode_t fake_mode;

                if (!test_bit_le(bit_pos, d.bitmap)) {
                        bit_pos++;
                        continue;
                }

                de = &d.dentry[bit_pos];

                if (unlikely(!de->name_len)) {
                        bit_pos++;
                        continue;
                }

                /*
                 * We only need the disk_name and hash to move the dentry.
                 * We don't need the original or casefolded filenames.
                 */
                memset(&fname, 0, sizeof(fname));
                fname.disk_name.name = d.filename[bit_pos];
                fname.disk_name.len = le16_to_cpu(de->name_len);
                fname.hash = de->hash_code;

                ino = le32_to_cpu(de->ino);
                fake_mode = fs_ftype_to_dtype(de->file_type) << S_DT_SHIFT;

                err = f2fs_add_regular_entry(dir, &fname, NULL, ino, fake_mode);
                if (err)
                        goto punch_dentry_pages;

                bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
        }
        return 0;
punch_dentry_pages:
        truncate_inode_pages(&dir->i_data, 0);
        f2fs_truncate_blocks(dir, 0, false);
        f2fs_remove_dirty_inode(dir);
        return err;
}

static int f2fs_move_rehashed_dirents(struct inode *dir, struct folio *ifolio,
                                                        void *inline_dentry)
{
        void *backup_dentry;
        int err;

        backup_dentry = f2fs_kmalloc(F2FS_I_SB(dir),
                                MAX_INLINE_DATA(dir), GFP_F2FS_ZERO);
        if (!backup_dentry) {
                f2fs_folio_put(ifolio, true);
                return -ENOMEM;
        }

        memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA(dir));
        f2fs_truncate_inline_inode(dir, ifolio, 0);

        folio_unlock(ifolio);

        err = f2fs_add_inline_entries(dir, backup_dentry);
        if (err)
                goto recover;

        folio_lock(ifolio);

        stat_dec_inline_dir(dir);
        clear_inode_flag(dir, FI_INLINE_DENTRY);

        /*
         * should retrieve reserved space which was used to keep
         * inline_dentry's structure for backward compatibility.
         */
        if (!f2fs_sb_has_flexible_inline_xattr(F2FS_I_SB(dir)) &&
                        !f2fs_has_inline_xattr(dir))
                F2FS_I(dir)->i_inline_xattr_size = 0;

        kfree(backup_dentry);
        return 0;
recover:
        folio_lock(ifolio);
        f2fs_folio_wait_writeback(ifolio, NODE, true, true);
        memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA(dir));
        f2fs_i_depth_write(dir, 0);
        f2fs_i_size_write(dir, MAX_INLINE_DATA(dir));
        folio_mark_dirty(ifolio);
        f2fs_folio_put(ifolio, true);

        kfree(backup_dentry);
        return err;
}

static int do_convert_inline_dir(struct inode *dir, struct folio *ifolio,
                                                        void *inline_dentry)
{
        if (!F2FS_I(dir)->i_dir_level)
                return f2fs_move_inline_dirents(dir, ifolio, inline_dentry);
        else
                return f2fs_move_rehashed_dirents(dir, ifolio, inline_dentry);
}

int f2fs_try_convert_inline_dir(struct inode *dir, struct dentry *dentry)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
        struct folio *ifolio;
        struct f2fs_filename fname;
        struct f2fs_lock_context lc;
        void *inline_dentry = NULL;
        int err = 0;

        if (!f2fs_has_inline_dentry(dir))
                return 0;

        f2fs_lock_op(sbi, &lc);

        err = f2fs_setup_filename(dir, &dentry->d_name, 0, &fname);
        if (err)
                goto out;

        ifolio = f2fs_get_inode_folio(sbi, dir->i_ino);
        if (IS_ERR(ifolio)) {
                err = PTR_ERR(ifolio);
                goto out_fname;
        }

        if (f2fs_has_enough_room(dir, ifolio, &fname)) {
                f2fs_folio_put(ifolio, true);
                goto out_fname;
        }

        inline_dentry = inline_data_addr(dir, ifolio);

        err = do_convert_inline_dir(dir, ifolio, inline_dentry);
        if (!err)
                f2fs_folio_put(ifolio, true);
out_fname:
        f2fs_free_filename(&fname);
out:
        f2fs_unlock_op(sbi, &lc);
        return err;
}

int f2fs_add_inline_entry(struct inode *dir, const struct f2fs_filename *fname,
                          struct inode *inode, nid_t ino, umode_t mode)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
        struct folio *ifolio;
        unsigned int bit_pos;
        void *inline_dentry = NULL;
        struct f2fs_dentry_ptr d;
        int slots = GET_DENTRY_SLOTS(fname->disk_name.len);
        struct folio *folio = NULL;
        int err = 0;

        ifolio = f2fs_get_inode_folio(sbi, dir->i_ino);
        if (IS_ERR(ifolio))
                return PTR_ERR(ifolio);

        inline_dentry = inline_data_addr(dir, ifolio);
        make_dentry_ptr_inline(dir, &d, inline_dentry);

        bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
        if (bit_pos >= d.max) {
                err = do_convert_inline_dir(dir, ifolio, inline_dentry);
                if (err)
                        return err;
                err = -EAGAIN;
                goto out;
        }

        if (inode) {
                f2fs_down_write_nested(&F2FS_I(inode)->i_sem,
                                                SINGLE_DEPTH_NESTING);
                folio = f2fs_init_inode_metadata(inode, dir, fname, ifolio);
                if (IS_ERR(folio)) {
                        err = PTR_ERR(folio);
                        goto fail;
                }
        }

        f2fs_folio_wait_writeback(ifolio, NODE, true, true);

        f2fs_update_dentry(ino, mode, &d, &fname->disk_name, fname->hash,
                           bit_pos);

        folio_mark_dirty(ifolio);

        /* we don't need to mark_inode_dirty now */
        if (inode) {
                f2fs_i_pino_write(inode, dir->i_ino);

                /* synchronize inode page's data from inode cache */
                if (is_inode_flag_set(inode, FI_NEW_INODE))
                        f2fs_update_inode(inode, folio);

                f2fs_folio_put(folio, true);
        }

        f2fs_update_parent_metadata(dir, inode, 0);
fail:
        if (inode)
                f2fs_up_write(&F2FS_I(inode)->i_sem);
out:
        f2fs_folio_put(ifolio, true);
        return err;
}

void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry,
                struct folio *folio, struct inode *dir, struct inode *inode)
{
        struct f2fs_dentry_ptr d;
        void *inline_dentry;
        int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
        unsigned int bit_pos;
        int i;

        folio_lock(folio);
        f2fs_folio_wait_writeback(folio, NODE, true, true);

        inline_dentry = inline_data_addr(dir, folio);
        make_dentry_ptr_inline(dir, &d, inline_dentry);

        bit_pos = dentry - d.dentry;
        for (i = 0; i < slots; i++)
                __clear_bit_le(bit_pos + i, d.bitmap);

        folio_mark_dirty(folio);
        f2fs_folio_put(folio, true);

        inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
        f2fs_mark_inode_dirty_sync(dir, false);

        if (inode)
                f2fs_drop_nlink(dir, inode);
}

bool f2fs_empty_inline_dir(struct inode *dir)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
        struct folio *ifolio;
        unsigned int bit_pos = 2;
        void *inline_dentry;
        struct f2fs_dentry_ptr d;

        ifolio = f2fs_get_inode_folio(sbi, dir->i_ino);
        if (IS_ERR(ifolio))
                return false;

        inline_dentry = inline_data_addr(dir, ifolio);
        make_dentry_ptr_inline(dir, &d, inline_dentry);

        bit_pos = find_next_bit_le(d.bitmap, d.max, bit_pos);

        f2fs_folio_put(ifolio, true);

        if (bit_pos < d.max)
                return false;

        return true;
}

int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
                                struct fscrypt_str *fstr)
{
        struct inode *inode = file_inode(file);
        struct folio *ifolio = NULL;
        struct f2fs_dentry_ptr d;
        void *inline_dentry = NULL;
        int err;

        make_dentry_ptr_inline(inode, &d, inline_dentry);

        if (ctx->pos == d.max)
                return 0;

        ifolio = f2fs_get_inode_folio(F2FS_I_SB(inode), inode->i_ino);
        if (IS_ERR(ifolio))
                return PTR_ERR(ifolio);

        /*
         * f2fs_readdir was protected by inode.i_rwsem, it is safe to access
         * ipage without page's lock held.
         */
        folio_unlock(ifolio);

        inline_dentry = inline_data_addr(inode, ifolio);

        make_dentry_ptr_inline(inode, &d, inline_dentry);

        err = f2fs_fill_dentries(ctx, &d, 0, fstr);
        if (!err)
                ctx->pos = d.max;

        f2fs_folio_put(ifolio, false);
        return err < 0 ? err : 0;
}

int f2fs_inline_data_fiemap(struct inode *inode,
                struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
{
        __u64 byteaddr, ilen;
        __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
                FIEMAP_EXTENT_LAST;
        struct node_info ni;
        struct folio *ifolio;
        int err = 0;

        ifolio = f2fs_get_inode_folio(F2FS_I_SB(inode), inode->i_ino);
        if (IS_ERR(ifolio))
                return PTR_ERR(ifolio);

        if ((S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
                                !f2fs_has_inline_data(inode)) {
                err = -EAGAIN;
                goto out;
        }

        if (S_ISDIR(inode->i_mode) && !f2fs_has_inline_dentry(inode)) {
                err = -EAGAIN;
                goto out;
        }

        ilen = min_t(size_t, MAX_INLINE_DATA(inode), i_size_read(inode));
        if (start >= ilen)
                goto out;
        if (start + len < ilen)
                ilen = start + len;
        ilen -= start;

        err = f2fs_get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni, false);
        if (err)
                goto out;

        byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
        byteaddr += (char *)inline_data_addr(inode, ifolio) -
                                        (char *)F2FS_INODE(ifolio);
        err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
        trace_f2fs_fiemap(inode, start, byteaddr, ilen, flags, err);
out:
        f2fs_folio_put(ifolio, true);
        return err;
}