diff options
Diffstat (limited to 'fs/f2fs/dir.c')
-rw-r--r-- | fs/f2fs/dir.c | 726 |
1 files changed, 457 insertions, 269 deletions
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index b54f87149c09..f0333d1ef222 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -17,8 +17,8 @@ static unsigned long dir_blocks(struct inode *inode) { - return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1)) - >> PAGE_CACHE_SHIFT; + return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1)) + >> PAGE_SHIFT; } static unsigned int dir_buckets(unsigned int level, int dir_level) @@ -48,7 +48,6 @@ static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { [F2FS_FT_SYMLINK] = DT_LNK, }; -#define S_SHIFT 12 static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, @@ -59,12 +58,18 @@ static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, }; -static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode) +void set_de_type(struct f2fs_dir_entry *de, umode_t mode) { - umode_t mode = inode->i_mode; de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; } +unsigned char get_de_type(struct f2fs_dir_entry *de) +{ + if (de->file_type < F2FS_FT_MAX) + return f2fs_filetype_table[de->file_type]; + return DT_UNKNOWN; +} + static unsigned long dir_block_index(unsigned int level, int dir_level, unsigned int idx) { @@ -77,81 +82,85 @@ static unsigned long dir_block_index(unsigned int level, return bidx; } -static bool early_match_name(size_t namelen, f2fs_hash_t namehash, - struct f2fs_dir_entry *de) +static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, + struct fscrypt_name *fname, + f2fs_hash_t namehash, + int *max_slots, + struct page **res_page) { - if (le16_to_cpu(de->name_len) != namelen) - return false; + struct f2fs_dentry_block *dentry_blk; + struct f2fs_dir_entry *de; + struct f2fs_dentry_ptr d; - if (de->hash_code != namehash) - return false; + dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); - return true; + make_dentry_ptr_block(NULL, &d, dentry_blk); + de = find_target_dentry(fname, namehash, max_slots, &d); + if (de) + *res_page = dentry_page; + else + kunmap(dentry_page); + + return de; } -static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, - struct qstr *name, int *max_slots, - f2fs_hash_t namehash, struct page **res_page) +struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname, + f2fs_hash_t namehash, int *max_slots, + struct f2fs_dentry_ptr *d) { struct f2fs_dir_entry *de; unsigned long bit_pos = 0; - struct f2fs_dentry_block *dentry_blk = kmap(dentry_page); - const void *dentry_bits = &dentry_blk->dentry_bitmap; int max_len = 0; - while (bit_pos < NR_DENTRY_IN_BLOCK) { - if (!test_bit_le(bit_pos, dentry_bits)) { - if (bit_pos == 0) - max_len = 1; - else if (!test_bit_le(bit_pos - 1, dentry_bits)) - max_len++; + if (max_slots) + *max_slots = 0; + while (bit_pos < d->max) { + if (!test_bit_le(bit_pos, d->bitmap)) { bit_pos++; + max_len++; 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 = dentry_page; - goto found; - } - } - if (max_len > *max_slots) { - *max_slots = max_len; - max_len = 0; + + de = &d->dentry[bit_pos]; + + if (unlikely(!de->name_len)) { + bit_pos++; + continue; } - /* - * For the most part, it should be a bug when name_len is zero. - * We stop here for figuring out where the bugs has occurred. - */ - f2fs_bug_on(F2FS_P_SB(dentry_page), !de->name_len); + if (de->hash_code == namehash && + fscrypt_match_name(fname, d->filename[bit_pos], + le16_to_cpu(de->name_len))) + goto found; + + if (max_slots && max_len > *max_slots) + *max_slots = max_len; + max_len = 0; bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); } de = NULL; - kunmap(dentry_page); found: - if (max_len > *max_slots) + if (max_slots && max_len > *max_slots) *max_slots = max_len; return de; } static struct f2fs_dir_entry *find_in_level(struct inode *dir, - unsigned int level, struct qstr *name, - f2fs_hash_t namehash, struct page **res_page) + unsigned int level, + struct fscrypt_name *fname, + struct page **res_page) { - int s = GET_DENTRY_SLOTS(name->len); + struct qstr name = FSTR_TO_QSTR(&fname->disk_name); + int s = GET_DENTRY_SLOTS(name.len); unsigned int nbucket, nblock; unsigned int bidx, end_block; struct page *dentry_page; struct f2fs_dir_entry *de = NULL; bool room = false; - int max_slots = 0; - - f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH); + int max_slots; + f2fs_hash_t namehash = f2fs_dentry_hash(&name, fname); nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); nblock = bucket_blocks(level); @@ -162,14 +171,19 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir, for (; bidx < end_block; bidx++) { /* no need to allocate new dentry pages to all the indices */ - dentry_page = find_data_page(dir, bidx, true); + dentry_page = find_data_page(dir, bidx); if (IS_ERR(dentry_page)) { - room = true; - continue; + if (PTR_ERR(dentry_page) == -ENOENT) { + room = true; + continue; + } else { + *res_page = dentry_page; + break; + } } - de = find_in_block(dentry_page, name, &max_slots, - namehash, res_page); + de = find_in_block(dentry_page, fname, namehash, &max_slots, + res_page); if (de) break; @@ -186,69 +200,93 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir, return de; } -/* - * Find an entry in the specified directory with the wanted name. - * It returns the page where the entry was found (as a parameter - res_page), - * and the entry itself. Page is returned mapped and unlocked. - * Entry is guaranteed to be valid. - */ -struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, - struct qstr *child, struct page **res_page) +struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir, + struct fscrypt_name *fname, struct page **res_page) { unsigned long npages = dir_blocks(dir); struct f2fs_dir_entry *de = NULL; - f2fs_hash_t name_hash; unsigned int max_depth; unsigned int level; - if (npages == 0) - return NULL; + if (f2fs_has_inline_dentry(dir)) { + *res_page = NULL; + de = find_in_inline_dir(dir, fname, res_page); + goto out; + } - *res_page = NULL; + if (npages == 0) { + *res_page = NULL; + goto out; + } - name_hash = f2fs_dentry_hash(child); max_depth = F2FS_I(dir)->i_current_depth; + if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { + f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, + "Corrupted max_depth of %lu: %u", + dir->i_ino, max_depth); + max_depth = MAX_DIR_HASH_DEPTH; + f2fs_i_depth_write(dir, max_depth); + } for (level = 0; level < max_depth; level++) { - de = find_in_level(dir, level, child, name_hash, res_page); - if (de) + *res_page = NULL; + de = find_in_level(dir, level, fname, res_page); + if (de || IS_ERR(*res_page)) break; } - if (!de && F2FS_I(dir)->chash != name_hash) { - F2FS_I(dir)->chash = name_hash; - F2FS_I(dir)->clevel = level - 1; - } +out: + /* This is to increase the speed of f2fs_create */ + if (!de) + F2FS_I(dir)->task = current; return de; } -struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) +/* + * Find an entry in the specified directory with the wanted name. + * It returns the page where the entry was found (as a parameter - res_page), + * and the entry itself. Page is returned mapped and unlocked. + * Entry is guaranteed to be valid. + */ +struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, + struct qstr *child, struct page **res_page) { - struct page *page; - struct f2fs_dir_entry *de; - struct f2fs_dentry_block *dentry_blk; + struct f2fs_dir_entry *de = NULL; + struct fscrypt_name fname; + int err; - page = get_lock_data_page(dir, 0); - if (IS_ERR(page)) + err = fscrypt_setup_filename(dir, child, 1, &fname); + if (err) { + if (err == -ENOENT) + *res_page = NULL; + else + *res_page = ERR_PTR(err); return NULL; + } - dentry_blk = kmap(page); - de = &dentry_blk->dentry[1]; - *p = page; - unlock_page(page); + de = __f2fs_find_entry(dir, &fname, res_page); + + fscrypt_free_filename(&fname); return de; } -ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) +struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) +{ + struct qstr dotdot = QSTR_INIT("..", 2); + + return f2fs_find_entry(dir, &dotdot, p); +} + +ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr, + struct page **page) { ino_t res = 0; struct f2fs_dir_entry *de; - struct page *page; - de = f2fs_find_entry(dir, qstr, &page); + de = f2fs_find_entry(dir, qstr, page); if (de) { res = le32_to_cpu(de->ino); - kunmap(page); - f2fs_put_page(page, 0); + f2fs_dentry_kunmap(dir, *page); + f2fs_put_page(*page, 0); } return res; @@ -257,15 +295,16 @@ ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, struct page *page, struct inode *inode) { + enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; lock_page(page); - f2fs_wait_on_page_writeback(page, DATA); + f2fs_wait_on_page_writeback(page, type, true); de->ino = cpu_to_le32(inode->i_ino); - set_de_type(de, inode); - kunmap(page); + set_de_type(de, inode->i_mode); + f2fs_dentry_kunmap(dir, page); set_page_dirty(page); - dir->i_mtime = dir->i_ctime = CURRENT_TIME; - mark_inode_dirty(dir); + dir->i_mtime = dir->i_ctime = current_time(dir); + f2fs_mark_inode_dirty_sync(dir, false); f2fs_put_page(page, 1); } @@ -273,7 +312,7 @@ static void init_dent_inode(const struct qstr *name, struct page *ipage) { struct f2fs_inode *ri; - f2fs_wait_on_page_writeback(ipage, NODE); + f2fs_wait_on_page_writeback(ipage, NODE, true); /* copy name info. to this inode page */ ri = F2FS_INODE(ipage); @@ -282,18 +321,17 @@ static void init_dent_inode(const struct qstr *name, struct page *ipage) set_page_dirty(ipage); } -int update_dent_inode(struct inode *inode, const struct qstr *name) +void do_make_empty_dir(struct inode *inode, struct inode *parent, + struct f2fs_dentry_ptr *d) { - struct page *page; + struct qstr dot = QSTR_INIT(".", 1); + struct qstr dotdot = QSTR_INIT("..", 2); - page = get_node_page(F2FS_I_SB(inode), inode->i_ino); - if (IS_ERR(page)) - return PTR_ERR(page); + /* update dirent of "." */ + f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); - init_dent_inode(name, page); - f2fs_put_page(page, 1); - - return 0; + /* update dirent of ".." */ + f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); } static int make_empty_dir(struct inode *inode, @@ -301,31 +339,20 @@ static int make_empty_dir(struct inode *inode, { struct page *dentry_page; struct f2fs_dentry_block *dentry_blk; - struct f2fs_dir_entry *de; + struct f2fs_dentry_ptr d; + + if (f2fs_has_inline_dentry(inode)) + return make_empty_inline_dir(inode, parent, page); dentry_page = get_new_data_page(inode, page, 0, true); if (IS_ERR(dentry_page)) return PTR_ERR(dentry_page); - dentry_blk = kmap_atomic(dentry_page); - 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); + make_dentry_ptr_block(NULL, &d, dentry_blk); + do_make_empty_dir(inode, parent, &d); + kunmap_atomic(dentry_blk); set_page_dirty(dentry_page); @@ -333,30 +360,42 @@ static int make_empty_dir(struct inode *inode, return 0; } -static struct page *init_inode_metadata(struct inode *inode, - struct inode *dir, const struct qstr *name) +struct page *init_inode_metadata(struct inode *inode, struct inode *dir, + const struct qstr *new_name, const struct qstr *orig_name, + struct page *dpage) { struct page *page; int err; - if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { + if (is_inode_flag_set(inode, FI_NEW_INODE)) { page = new_inode_page(inode); if (IS_ERR(page)) return page; if (S_ISDIR(inode->i_mode)) { + /* in order to handle error case */ + get_page(page); err = make_empty_dir(inode, dir, page); - if (err) - goto error; + if (err) { + lock_page(page); + goto put_error; + } + put_page(page); } - err = f2fs_init_acl(inode, dir, page); + err = f2fs_init_acl(inode, dir, page, dpage); if (err) goto put_error; - err = f2fs_init_security(inode, dir, name, page); + err = f2fs_init_security(inode, dir, orig_name, page); if (err) goto put_error; + + if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { + err = fscrypt_inherit_context(dir, inode, page, false); + if (err) + goto put_error; + } } else { page = get_node_page(F2FS_I_SB(dir), inode->i_ino); if (IS_ERR(page)) @@ -365,14 +404,17 @@ static struct page *init_inode_metadata(struct inode *inode, set_cold_node(inode, page); } - if (name) - init_dent_inode(name, page); + if (new_name) { + init_dent_inode(new_name, page); + if (f2fs_encrypted_inode(dir)) + file_set_enc_name(inode); + } /* * This file should be checkpointed during fsync. * We lost i_pino from now on. */ - if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { + if (is_inode_flag_set(inode, FI_INC_LINK)) { file_lost_pino(inode); /* * If link the tmpfile to alias through linkat path, @@ -380,91 +422,97 @@ static struct page *init_inode_metadata(struct inode *inode, */ if (inode->i_nlink == 0) remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); - inc_nlink(inode); + f2fs_i_links_write(inode, true); } return page; put_error: + clear_nlink(inode); + update_inode(inode, page); f2fs_put_page(page, 1); -error: - /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ - truncate_inode_pages(&inode->i_data, 0); - truncate_blocks(inode, 0, false); - remove_dirty_dir_inode(inode); - remove_inode_page(inode); return ERR_PTR(err); } -static void update_parent_metadata(struct inode *dir, struct inode *inode, +void update_parent_metadata(struct inode *dir, struct inode *inode, unsigned int current_depth) { - if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { - if (S_ISDIR(inode->i_mode)) { - inc_nlink(dir); - set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); - } - clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); + if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { + if (S_ISDIR(inode->i_mode)) + f2fs_i_links_write(dir, true); + clear_inode_flag(inode, FI_NEW_INODE); } - dir->i_mtime = dir->i_ctime = CURRENT_TIME; - mark_inode_dirty(dir); + dir->i_mtime = dir->i_ctime = current_time(dir); + f2fs_mark_inode_dirty_sync(dir, false); - if (F2FS_I(dir)->i_current_depth != current_depth) { - F2FS_I(dir)->i_current_depth = current_depth; - set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); - } + if (F2FS_I(dir)->i_current_depth != current_depth) + f2fs_i_depth_write(dir, current_depth); - if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) - clear_inode_flag(F2FS_I(inode), FI_INC_LINK); + if (inode && is_inode_flag_set(inode, FI_INC_LINK)) + clear_inode_flag(inode, FI_INC_LINK); } -static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots) +int room_for_filename(const void *bitmap, int slots, int max_slots) { int bit_start = 0; int zero_start, zero_end; next: - zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, - NR_DENTRY_IN_BLOCK, - bit_start); - if (zero_start >= NR_DENTRY_IN_BLOCK) - return NR_DENTRY_IN_BLOCK; + zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); + if (zero_start >= max_slots) + return max_slots; - zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, - NR_DENTRY_IN_BLOCK, - zero_start); + zero_end = find_next_bit_le(bitmap, max_slots, zero_start); if (zero_end - zero_start >= slots) return zero_start; bit_start = zero_end + 1; - if (zero_end + 1 >= NR_DENTRY_IN_BLOCK) - return NR_DENTRY_IN_BLOCK; + if (zero_end + 1 >= max_slots) + return max_slots; goto next; } -/* - * Caller should grab and release a rwsem by calling f2fs_lock_op() and - * f2fs_unlock_op(). - */ -int __f2fs_add_link(struct inode *dir, const struct qstr *name, - struct inode *inode) +void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, + const struct qstr *name, f2fs_hash_t name_hash, + unsigned int bit_pos) +{ + struct f2fs_dir_entry *de; + int slots = GET_DENTRY_SLOTS(name->len); + int i; + + de = &d->dentry[bit_pos]; + de->hash_code = name_hash; + de->name_len = cpu_to_le16(name->len); + memcpy(d->filename[bit_pos], name->name, name->len); + de->ino = cpu_to_le32(ino); + set_de_type(de, mode); + for (i = 0; i < slots; i++) { + __set_bit_le(bit_pos + i, (void *)d->bitmap); + /* avoid wrong garbage data for readdir */ + if (i) + (de + i)->name_len = 0; + } +} + +int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, + const struct qstr *orig_name, + struct inode *inode, nid_t ino, umode_t mode) { unsigned int bit_pos; unsigned int level; unsigned int current_depth; unsigned long bidx, block; f2fs_hash_t dentry_hash; - struct f2fs_dir_entry *de; unsigned int nbucket, nblock; - size_t namelen = name->len; struct page *dentry_page = NULL; struct f2fs_dentry_block *dentry_blk = NULL; - int slots = GET_DENTRY_SLOTS(namelen); - struct page *page; - int err = 0; - int i; + struct f2fs_dentry_ptr d; + struct page *page = NULL; + int slots, err = 0; - dentry_hash = f2fs_dentry_hash(name); level = 0; + slots = GET_DENTRY_SLOTS(new_name->len); + dentry_hash = f2fs_dentry_hash(new_name, NULL); + current_depth = F2FS_I(dir)->i_current_depth; if (F2FS_I(dir)->chash == dentry_hash) { level = F2FS_I(dir)->clevel; @@ -472,6 +520,12 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name, } start: +#ifdef CONFIG_F2FS_FAULT_INJECTION + if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) { + f2fs_show_injection_info(FAULT_DIR_DEPTH); + return -ENOSPC; + } +#endif if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) return -ENOSPC; @@ -491,7 +545,8 @@ start: return PTR_ERR(dentry_page); dentry_blk = kmap(dentry_page); - bit_pos = room_for_filename(dentry_blk, slots); + bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, + slots, NR_DENTRY_IN_BLOCK); if (bit_pos < NR_DENTRY_IN_BLOCK) goto add_dentry; @@ -503,39 +558,96 @@ start: ++level; goto start; add_dentry: - f2fs_wait_on_page_writeback(dentry_page, DATA); + f2fs_wait_on_page_writeback(dentry_page, DATA, true); - down_write(&F2FS_I(inode)->i_sem); - page = init_inode_metadata(inode, dir, name); - if (IS_ERR(page)) { - err = PTR_ERR(page); - goto fail; + if (inode) { + down_write(&F2FS_I(inode)->i_sem); + page = init_inode_metadata(inode, dir, new_name, + orig_name, NULL); + if (IS_ERR(page)) { + err = PTR_ERR(page); + goto fail; + } } - de = &dentry_blk->dentry[bit_pos]; - de->hash_code = dentry_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); + + make_dentry_ptr_block(NULL, &d, dentry_blk); + f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); + set_page_dirty(dentry_page); - /* 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); + if (inode) { + f2fs_i_pino_write(inode, dir->i_ino); + f2fs_put_page(page, 1); + } update_parent_metadata(dir, inode, current_depth); fail: - up_write(&F2FS_I(inode)->i_sem); + if (inode) + up_write(&F2FS_I(inode)->i_sem); - if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { - update_inode_page(dir); - clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); - } kunmap(dentry_page); f2fs_put_page(dentry_page, 1); + + return err; +} + +int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname, + struct inode *inode, nid_t ino, umode_t mode) +{ + struct qstr new_name; + int err = -EAGAIN; + + new_name.name = fname_name(fname); + new_name.len = fname_len(fname); + + if (f2fs_has_inline_dentry(dir)) + err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname, + inode, ino, mode); + if (err == -EAGAIN) + err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname, + inode, ino, mode); + + f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); + return err; +} + +/* + * Caller should grab and release a rwsem by calling f2fs_lock_op() and + * f2fs_unlock_op(). + */ +int __f2fs_add_link(struct inode *dir, const struct qstr *name, + struct inode *inode, nid_t ino, umode_t mode) +{ + struct fscrypt_name fname; + struct page *page = NULL; + struct f2fs_dir_entry *de = NULL; + int err; + + err = fscrypt_setup_filename(dir, name, 0, &fname); + if (err) + return err; + + /* + * An immature stakable filesystem shows a race condition between lookup + * and create. If we have same task when doing lookup and create, it's + * definitely fine as expected by VFS normally. Otherwise, let's just + * verify on-disk dentry one more time, which guarantees filesystem + * consistency more. + */ + if (current != F2FS_I(dir)->task) { + de = __f2fs_find_entry(dir, &fname, &page); + F2FS_I(dir)->task = NULL; + } + if (de) { + f2fs_dentry_kunmap(dir, page); + f2fs_put_page(page, 0); + err = -EEXIST; + } else if (IS_ERR(page)) { + err = PTR_ERR(page); + } else { + err = __f2fs_do_add_link(dir, &fname, inode, ino, mode); + } + fscrypt_free_filename(&fname); return err; } @@ -545,41 +657,67 @@ int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) int err = 0; down_write(&F2FS_I(inode)->i_sem); - page = init_inode_metadata(inode, dir, NULL); + page = init_inode_metadata(inode, dir, NULL, NULL, NULL); if (IS_ERR(page)) { err = PTR_ERR(page); goto fail; } - /* we don't need to mark_inode_dirty now */ - update_inode(inode, page); f2fs_put_page(page, 1); - clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); + clear_inode_flag(inode, FI_NEW_INODE); fail: up_write(&F2FS_I(inode)->i_sem); + f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); return err; } +void f2fs_drop_nlink(struct inode *dir, struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + + down_write(&F2FS_I(inode)->i_sem); + + if (S_ISDIR(inode->i_mode)) + f2fs_i_links_write(dir, false); + inode->i_ctime = current_time(inode); + + f2fs_i_links_write(inode, false); + if (S_ISDIR(inode->i_mode)) { + f2fs_i_links_write(inode, false); + f2fs_i_size_write(inode, 0); + } + up_write(&F2FS_I(inode)->i_sem); + + if (inode->i_nlink == 0) + add_orphan_inode(inode); + else + release_orphan_inode(sbi); +} + /* * It only removes the dentry from the dentry page, corresponding name * entry in name page does not need to be touched during deletion. */ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, - struct inode *inode) + struct inode *dir, struct inode *inode) { struct f2fs_dentry_block *dentry_blk; unsigned int bit_pos; - struct inode *dir = page->mapping->host; int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); int i; + f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); + + if (f2fs_has_inline_dentry(dir)) + return f2fs_delete_inline_entry(dentry, page, dir, inode); + lock_page(page); - f2fs_wait_on_page_writeback(page, DATA); + f2fs_wait_on_page_writeback(page, DATA, true); dentry_blk = page_address(page); bit_pos = dentry - dentry_blk->dentry; for (i = 0; i < slots; i++) - test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); + __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); /* Let's check and deallocate this dentry page */ bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, @@ -588,37 +726,19 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, kunmap(page); /* kunmap - pair of f2fs_find_entry */ set_page_dirty(page); - dir->i_ctime = dir->i_mtime = CURRENT_TIME; - - if (inode) { - struct f2fs_sb_info *sbi = F2FS_I_SB(dir); - - down_write(&F2FS_I(inode)->i_sem); - - if (S_ISDIR(inode->i_mode)) { - drop_nlink(dir); - update_inode_page(dir); - } - inode->i_ctime = CURRENT_TIME; - drop_nlink(inode); - if (S_ISDIR(inode->i_mode)) { - drop_nlink(inode); - i_size_write(inode, 0); - } - up_write(&F2FS_I(inode)->i_sem); - update_inode_page(inode); + dir->i_ctime = dir->i_mtime = current_time(dir); + f2fs_mark_inode_dirty_sync(dir, false); - if (inode->i_nlink == 0) - add_orphan_inode(sbi, inode->i_ino); - else - release_orphan_inode(sbi); - } + if (inode) + f2fs_drop_nlink(dir, inode); - if (bit_pos == NR_DENTRY_IN_BLOCK) { - truncate_hole(dir, page->index, page->index + 1); + if (bit_pos == NR_DENTRY_IN_BLOCK && + !truncate_hole(dir, page->index, page->index + 1)) { clear_page_dirty_for_io(page); + ClearPagePrivate(page); ClearPageUptodate(page); inode_dec_dirty_pages(dir); + remove_dirty_inode(dir); } f2fs_put_page(page, 1); } @@ -628,11 +748,14 @@ bool f2fs_empty_dir(struct inode *dir) unsigned long bidx; struct page *dentry_page; unsigned int bit_pos; - struct f2fs_dentry_block *dentry_blk; + struct f2fs_dentry_block *dentry_blk; unsigned long nblock = dir_blocks(dir); + if (f2fs_has_inline_dentry(dir)) + return f2fs_empty_inline_dir(dir); + for (bidx = 0; bidx < nblock; bidx++) { - dentry_page = get_lock_data_page(dir, bidx); + dentry_page = get_lock_data_page(dir, bidx, false); if (IS_ERR(dentry_page)) { if (PTR_ERR(dentry_page) == -ENOENT) continue; @@ -640,7 +763,6 @@ bool f2fs_empty_dir(struct inode *dir) return false; } - dentry_blk = kmap_atomic(dentry_page); if (bidx == 0) bit_pos = 2; @@ -659,19 +781,83 @@ bool f2fs_empty_dir(struct inode *dir) return true; } +int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, + unsigned int start_pos, struct fscrypt_str *fstr) +{ + unsigned char d_type = DT_UNKNOWN; + unsigned int bit_pos; + struct f2fs_dir_entry *de = NULL; + struct fscrypt_str de_name = FSTR_INIT(NULL, 0); + + bit_pos = ((unsigned long)ctx->pos % d->max); + + while (bit_pos < d->max) { + bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); + if (bit_pos >= d->max) + break; + + de = &d->dentry[bit_pos]; + if (de->name_len == 0) { + bit_pos++; + ctx->pos = start_pos + bit_pos; + continue; + } + + d_type = get_de_type(de); + + de_name.name = d->filename[bit_pos]; + de_name.len = le16_to_cpu(de->name_len); + + if (f2fs_encrypted_inode(d->inode)) { + int save_len = fstr->len; + int err; + + err = fscrypt_fname_disk_to_usr(d->inode, + (u32)de->hash_code, 0, + &de_name, fstr); + if (err) + return err; + + de_name = *fstr; + fstr->len = save_len; + } + + if (!dir_emit(ctx, de_name.name, de_name.len, + le32_to_cpu(de->ino), d_type)) + return 1; + + bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); + ctx->pos = start_pos + bit_pos; + } + return 0; +} + static int f2fs_readdir(struct file *file, struct dir_context *ctx) { struct inode *inode = file_inode(file); unsigned long npages = dir_blocks(inode); - unsigned int bit_pos = 0; struct f2fs_dentry_block *dentry_blk = NULL; - struct f2fs_dir_entry *de = NULL; struct page *dentry_page = NULL; struct file_ra_state *ra = &file->f_ra; unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); - unsigned char d_type = DT_UNKNOWN; + struct f2fs_dentry_ptr d; + struct fscrypt_str fstr = FSTR_INIT(NULL, 0); + int err = 0; + + if (f2fs_encrypted_inode(inode)) { + err = fscrypt_get_encryption_info(inode); + if (err && err != -ENOKEY) + return err; - bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK); + err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); + if (err < 0) + return err; + } + + if (f2fs_has_inline_dentry(inode)) { + err = f2fs_read_inline_dir(file, ctx, &fstr); + goto out; + } /* readahead for multi pages of dir */ if (npages - n > 1 && !ra_has_index(ra, n)) @@ -679,44 +865,42 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx) min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); for (; n < npages; n++) { - dentry_page = get_lock_data_page(inode, n); - if (IS_ERR(dentry_page)) - continue; + dentry_page = get_lock_data_page(inode, n, false); + if (IS_ERR(dentry_page)) { + err = PTR_ERR(dentry_page); + if (err == -ENOENT) { + err = 0; + continue; + } else { + goto out; + } + } dentry_blk = kmap(dentry_page); - while (bit_pos < NR_DENTRY_IN_BLOCK) { - bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, - NR_DENTRY_IN_BLOCK, - bit_pos); - if (bit_pos >= NR_DENTRY_IN_BLOCK) - break; - de = &dentry_blk->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, - dentry_blk->filename[bit_pos], - le16_to_cpu(de->name_len), - le32_to_cpu(de->ino), d_type)) - goto stop; + make_dentry_ptr_block(inode, &d, dentry_blk); - bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); - ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos; + err = f2fs_fill_dentries(ctx, &d, + n * NR_DENTRY_IN_BLOCK, &fstr); + if (err) { + kunmap(dentry_page); + f2fs_put_page(dentry_page, 1); + break; } - bit_pos = 0; + ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; kunmap(dentry_page); f2fs_put_page(dentry_page, 1); - dentry_page = NULL; - } -stop: - if (dentry_page && !IS_ERR(dentry_page)) { - kunmap(dentry_page); - f2fs_put_page(dentry_page, 1); } +out: + fscrypt_fname_free_buffer(&fstr); + return err < 0 ? err : 0; +} +static int f2fs_dir_open(struct inode *inode, struct file *filp) +{ + if (f2fs_encrypted_inode(inode)) + return fscrypt_get_encryption_info(inode) ? -EACCES : 0; return 0; } @@ -725,5 +909,9 @@ const struct file_operations f2fs_dir_operations = { .read = generic_read_dir, .iterate = f2fs_readdir, .fsync = f2fs_sync_file, + .open = f2fs_dir_open, .unlocked_ioctl = f2fs_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = f2fs_compat_ioctl, +#endif }; |