From 201a05be9628ae58efe7638e0c7ae3937ec85273 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Wed, 24 Sep 2014 18:17:53 +0800 Subject: [PATCH] f2fs: add key function to handle inline dir Adds Functions to implement inline dir init/lookup/insert/delete/convert ops. Signed-off-by: Chao Yu [Jaegeuk Kim: remove needless reserved area copy, pointed by Dan Carpenter] Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 9 ++ fs/f2fs/inline.c | 346 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 355 insertions(+) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 97d90ed1d67b..c537699d0182 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1551,4 +1551,13 @@ int f2fs_convert_inline_data(struct inode *, pgoff_t, struct page *); int f2fs_write_inline_data(struct inode *, struct page *, unsigned int); void truncate_inline_data(struct inode *, u64); bool recover_inline_data(struct inode *, struct page *); +struct f2fs_dir_entry *find_in_inline_dir(struct inode *, struct qstr *, + struct page **); +struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *, struct page **); +int make_empty_inline_dir(struct inode *inode, struct inode *, struct page *); +int f2fs_add_inline_entry(struct inode *, const struct qstr *, struct inode *); +void f2fs_delete_inline_entry(struct f2fs_dir_entry *, struct page *, + struct inode *, struct inode *); +bool f2fs_empty_inline_dir(struct inode *); +int f2fs_read_inline_dir(struct file *, struct dir_context *); #endif diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c index e3abcfb54374..b3be96ba585c 100644 --- a/fs/f2fs/inline.c +++ b/fs/f2fs/inline.c @@ -258,3 +258,349 @@ process_inline: } return false; } + +struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir, + struct qstr *name, struct page **res_page) +{ + struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); + struct page *ipage; + struct f2fs_dir_entry *de; + f2fs_hash_t namehash; + unsigned long bit_pos = 0; + struct f2fs_inline_dentry *dentry_blk; + const void *dentry_bits; + + ipage = get_node_page(sbi, dir->i_ino); + if (IS_ERR(ipage)) + return NULL; + + namehash = f2fs_dentry_hash(name); + + dentry_blk = inline_data_addr(ipage); + dentry_bits = &dentry_blk->dentry_bitmap; + + while (bit_pos < NR_INLINE_DENTRY) { + if (!test_bit_le(bit_pos, dentry_bits)) { + bit_pos++; + continue; + } + de = &dentry_blk->dentry[bit_pos]; + if (early_match_name(name->len, namehash, de)) { + if (!memcmp(dentry_blk->filename[bit_pos], + name->name, + name->len)) { + *res_page = ipage; + goto found; + } + } + + /* + * For the most part, it should be a bug when name_len is zero. + * We stop here for figuring out where the bugs are occurred. + */ + f2fs_bug_on(F2FS_P_SB(ipage), !de->name_len); + + bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); + } + + de = NULL; +found: + unlock_page(ipage); + return de; +} + +struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir, + struct page **p) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct page *ipage; + struct f2fs_dir_entry *de; + struct f2fs_inline_dentry *dentry_blk; + + ipage = get_node_page(sbi, dir->i_ino); + if (IS_ERR(ipage)) + return NULL; + + dentry_blk = inline_data_addr(ipage); + de = &dentry_blk->dentry[1]; + *p = ipage; + unlock_page(ipage); + return de; +} + +int make_empty_inline_dir(struct inode *inode, struct inode *parent, + struct page *ipage) +{ + struct f2fs_inline_dentry *dentry_blk; + struct f2fs_dir_entry *de; + + dentry_blk = inline_data_addr(ipage); + + de = &dentry_blk->dentry[0]; + de->name_len = cpu_to_le16(1); + de->hash_code = 0; + de->ino = cpu_to_le32(inode->i_ino); + memcpy(dentry_blk->filename[0], ".", 1); + set_de_type(de, inode); + + de = &dentry_blk->dentry[1]; + de->hash_code = 0; + de->name_len = cpu_to_le16(2); + de->ino = cpu_to_le32(parent->i_ino); + memcpy(dentry_blk->filename[1], "..", 2); + set_de_type(de, inode); + + test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); + test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); + + set_page_dirty(ipage); + + /* update i_size to MAX_INLINE_DATA */ + if (i_size_read(inode) < MAX_INLINE_DATA) { + i_size_write(inode, MAX_INLINE_DATA); + set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); + } + return 0; +} + +int room_in_inline_dir(struct f2fs_inline_dentry *dentry_blk, int slots) +{ + int bit_start = 0; + int zero_start, zero_end; +next: + zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, + NR_INLINE_DENTRY, + bit_start); + if (zero_start >= NR_INLINE_DENTRY) + return NR_INLINE_DENTRY; + + zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, + NR_INLINE_DENTRY, + zero_start); + if (zero_end - zero_start >= slots) + return zero_start; + + bit_start = zero_end + 1; + + if (zero_end + 1 >= NR_INLINE_DENTRY) + return NR_INLINE_DENTRY; + goto next; +} + +int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage, + struct f2fs_inline_dentry *inline_dentry) +{ + struct page *page; + struct dnode_of_data dn; + struct f2fs_dentry_block *dentry_blk; + int err; + + page = grab_cache_page(dir->i_mapping, 0); + if (!page) + return -ENOMEM; + + set_new_dnode(&dn, dir, ipage, NULL, 0); + err = f2fs_reserve_block(&dn, 0); + if (err) + goto out; + + f2fs_wait_on_page_writeback(page, DATA); + zero_user_segment(page, 0, PAGE_CACHE_SIZE); + + dentry_blk = kmap(page); + + /* copy data from inline dentry block to new dentry block */ + memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap, + INLINE_DENTRY_BITMAP_SIZE); + memcpy(dentry_blk->dentry, inline_dentry->dentry, + sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY); + memcpy(dentry_blk->filename, inline_dentry->filename, + NR_INLINE_DENTRY * F2FS_SLOT_LEN); + + kunmap(page); + SetPageUptodate(page); + set_page_dirty(page); + + /* clear inline dir and flag after data writeback */ + zero_user_segment(ipage, INLINE_DATA_OFFSET, + INLINE_DATA_OFFSET + MAX_INLINE_DATA); + + stat_dec_inline_inode(dir); + + if (i_size_read(dir) < PAGE_CACHE_SIZE) { + i_size_write(dir, PAGE_CACHE_SIZE); + set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); + } + + sync_inode_page(&dn); +out: + f2fs_put_page(page, 1); + return err; +} + +int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name, + struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct page *ipage; + unsigned int bit_pos; + f2fs_hash_t name_hash; + struct f2fs_dir_entry *de; + size_t namelen = name->len; + struct f2fs_inline_dentry *dentry_blk = NULL; + int slots = GET_DENTRY_SLOTS(namelen); + struct page *page; + int err = 0; + int i; + + name_hash = f2fs_dentry_hash(name); + + ipage = get_node_page(sbi, dir->i_ino); + if (IS_ERR(ipage)) + return PTR_ERR(ipage); + + dentry_blk = inline_data_addr(ipage); + bit_pos = room_in_inline_dir(dentry_blk, slots); + if (bit_pos >= NR_INLINE_DENTRY) { + err = f2fs_convert_inline_dir(dir, ipage, dentry_blk); + if (!err) + err = -EAGAIN; + goto out; + } + + f2fs_wait_on_page_writeback(ipage, DATA); + + down_write(&F2FS_I(inode)->i_sem); + page = init_inode_metadata(inode, dir, name); + if (IS_ERR(page)) { + err = PTR_ERR(page); + goto fail; + } + de = &dentry_blk->dentry[bit_pos]; + de->hash_code = name_hash; + de->name_len = cpu_to_le16(namelen); + memcpy(dentry_blk->filename[bit_pos], name->name, name->len); + de->ino = cpu_to_le32(inode->i_ino); + set_de_type(de, inode); + for (i = 0; i < slots; i++) + test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); + set_page_dirty(ipage); + + /* we don't need to mark_inode_dirty now */ + F2FS_I(inode)->i_pino = dir->i_ino; + update_inode(inode, page); + f2fs_put_page(page, 1); + + update_parent_metadata(dir, inode, 0); +fail: + up_write(&F2FS_I(inode)->i_sem); + + if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { + update_inode(dir, ipage); + clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); + } +out: + f2fs_put_page(ipage, 1); + return err; +} + +void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page, + struct inode *dir, struct inode *inode) +{ + struct f2fs_inline_dentry *inline_dentry; + int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); + unsigned int bit_pos; + int i; + + lock_page(page); + f2fs_wait_on_page_writeback(page, DATA); + + inline_dentry = inline_data_addr(page); + bit_pos = dentry - inline_dentry->dentry; + for (i = 0; i < slots; i++) + test_and_clear_bit_le(bit_pos + i, + &inline_dentry->dentry_bitmap); + + set_page_dirty(page); + + dir->i_ctime = dir->i_mtime = CURRENT_TIME; + + if (inode) + f2fs_drop_nlink(dir, inode, page); + + f2fs_put_page(page, 1); +} + +bool f2fs_empty_inline_dir(struct inode *dir) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct page *ipage; + unsigned int bit_pos = 2; + struct f2fs_inline_dentry *dentry_blk; + + ipage = get_node_page(sbi, dir->i_ino); + if (IS_ERR(ipage)) + return false; + + dentry_blk = inline_data_addr(ipage); + bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, + NR_INLINE_DENTRY, + bit_pos); + + f2fs_put_page(ipage, 1); + + if (bit_pos < NR_INLINE_DENTRY) + return false; + + return true; +} + +int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx) +{ + struct inode *inode = file_inode(file); + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + unsigned int bit_pos = 0; + struct f2fs_inline_dentry *inline_dentry = NULL; + struct f2fs_dir_entry *de = NULL; + struct page *ipage = NULL; + unsigned char d_type = DT_UNKNOWN; + + if (ctx->pos == NR_INLINE_DENTRY) + return 0; + + ipage = get_node_page(sbi, inode->i_ino); + if (IS_ERR(ipage)) + return PTR_ERR(ipage); + + bit_pos = ((unsigned long)ctx->pos % NR_INLINE_DENTRY); + + inline_dentry = inline_data_addr(ipage); + while (bit_pos < NR_INLINE_DENTRY) { + bit_pos = find_next_bit_le(&inline_dentry->dentry_bitmap, + NR_INLINE_DENTRY, + bit_pos); + if (bit_pos >= NR_INLINE_DENTRY) + break; + + de = &inline_dentry->dentry[bit_pos]; + if (de->file_type < F2FS_FT_MAX) + d_type = f2fs_filetype_table[de->file_type]; + else + d_type = DT_UNKNOWN; + + if (!dir_emit(ctx, + inline_dentry->filename[bit_pos], + le16_to_cpu(de->name_len), + le32_to_cpu(de->ino), d_type)) + goto out; + + bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); + ctx->pos = bit_pos; + } + + ctx->pos = NR_INLINE_DENTRY; +out: + f2fs_put_page(ipage, 1); + + return 0; +} -- 2.39.5