| /* |
| * fs/f2fs/namei.c |
| * |
| * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com/ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/fs.h> |
| #include <linux/f2fs_fs.h> |
| #include <linux/pagemap.h> |
| #include <linux/sched.h> |
| #include <linux/ctype.h> |
| #include <linux/dcache.h> |
| #include <linux/namei.h> |
| #include <linux/quotaops.h> |
| |
| #include "f2fs.h" |
| #include "node.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include <trace/events/f2fs.h> |
| |
| static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| nid_t ino; |
| struct inode *inode; |
| bool nid_free = false; |
| int err; |
| |
| inode = new_inode(dir->i_sb); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| |
| f2fs_lock_op(sbi); |
| if (!alloc_nid(sbi, &ino)) { |
| f2fs_unlock_op(sbi); |
| err = -ENOSPC; |
| goto fail; |
| } |
| f2fs_unlock_op(sbi); |
| |
| nid_free = true; |
| |
| inode_init_owner(inode, dir, mode); |
| |
| inode->i_ino = ino; |
| inode->i_blocks = 0; |
| inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
| inode->i_generation = sbi->s_next_generation++; |
| |
| err = insert_inode_locked(inode); |
| if (err) { |
| err = -EINVAL; |
| goto fail; |
| } |
| |
| if (f2fs_sb_has_project_quota(sbi->sb) && |
| (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL)) |
| F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid; |
| else |
| F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns, |
| F2FS_DEF_PROJID); |
| |
| err = dquot_initialize(inode); |
| if (err) |
| goto fail_drop; |
| |
| err = dquot_alloc_inode(inode); |
| if (err) |
| goto fail_drop; |
| |
| /* If the directory encrypted, then we should encrypt the inode. */ |
| if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) |
| f2fs_set_encrypted_inode(inode); |
| |
| set_inode_flag(inode, FI_NEW_INODE); |
| |
| if (f2fs_sb_has_extra_attr(sbi->sb)) { |
| set_inode_flag(inode, FI_EXTRA_ATTR); |
| F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE; |
| } |
| |
| if (test_opt(sbi, INLINE_XATTR)) |
| set_inode_flag(inode, FI_INLINE_XATTR); |
| if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) |
| set_inode_flag(inode, FI_INLINE_DATA); |
| if (f2fs_may_inline_dentry(inode)) |
| set_inode_flag(inode, FI_INLINE_DENTRY); |
| |
| f2fs_init_extent_tree(inode, NULL); |
| |
| stat_inc_inline_xattr(inode); |
| stat_inc_inline_inode(inode); |
| stat_inc_inline_dir(inode); |
| |
| F2FS_I(inode)->i_flags = |
| f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED); |
| |
| if (S_ISDIR(inode->i_mode)) |
| F2FS_I(inode)->i_flags |= FS_INDEX_FL; |
| |
| if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL) |
| set_inode_flag(inode, FI_PROJ_INHERIT); |
| |
| trace_f2fs_new_inode(inode, 0); |
| return inode; |
| |
| fail: |
| trace_f2fs_new_inode(inode, err); |
| make_bad_inode(inode); |
| if (nid_free) |
| set_inode_flag(inode, FI_FREE_NID); |
| iput(inode); |
| return ERR_PTR(err); |
| fail_drop: |
| trace_f2fs_new_inode(inode, err); |
| dquot_drop(inode); |
| inode->i_flags |= S_NOQUOTA; |
| if (nid_free) |
| set_inode_flag(inode, FI_FREE_NID); |
| clear_nlink(inode); |
| unlock_new_inode(inode); |
| iput(inode); |
| return ERR_PTR(err); |
| } |
| |
| static int is_multimedia_file(const unsigned char *s, const char *sub) |
| { |
| size_t slen = strlen(s); |
| size_t sublen = strlen(sub); |
| int i; |
| |
| /* |
| * filename format of multimedia file should be defined as: |
| * "filename + '.' + extension + (optional: '.' + temp extension)". |
| */ |
| if (slen < sublen + 2) |
| return 0; |
| |
| for (i = 1; i < slen - sublen; i++) { |
| if (s[i] != '.') |
| continue; |
| if (!strncasecmp(s + i + 1, sub, sublen)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Set multimedia files as cold files for hot/cold data separation |
| */ |
| static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, |
| const unsigned char *name) |
| { |
| int i; |
| __u8 (*extlist)[8] = sbi->raw_super->extension_list; |
| |
| int count = le32_to_cpu(sbi->raw_super->extension_count); |
| for (i = 0; i < count; i++) { |
| if (is_multimedia_file(name, extlist[i])) { |
| file_set_cold(inode); |
| break; |
| } |
| } |
| } |
| |
| static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct inode *inode; |
| nid_t ino = 0; |
| int err; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| inode = f2fs_new_inode(dir, mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) |
| set_cold_files(sbi, inode, dentry->d_name.name); |
| |
| inode->i_op = &f2fs_file_inode_operations; |
| inode->i_fop = &f2fs_file_operations; |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| ino = inode->i_ino; |
| |
| f2fs_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| if (err) |
| goto out; |
| f2fs_unlock_op(sbi); |
| |
| alloc_nid_done(sbi, ino); |
| |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| |
| if (IS_DIRSYNC(dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| |
| f2fs_balance_fs(sbi, true); |
| return 0; |
| out: |
| handle_failed_inode(inode); |
| return err; |
| } |
| |
| static int f2fs_link(struct dentry *old_dentry, struct inode *dir, |
| struct dentry *dentry) |
| { |
| struct inode *inode = d_inode(old_dentry); |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| int err; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| if (f2fs_encrypted_inode(dir) && |
| !fscrypt_has_permitted_context(dir, inode)) |
| return -EPERM; |
| |
| if (is_inode_flag_set(dir, FI_PROJ_INHERIT) && |
| (!projid_eq(F2FS_I(dir)->i_projid, |
| F2FS_I(old_dentry->d_inode)->i_projid))) |
| return -EXDEV; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| f2fs_balance_fs(sbi, true); |
| |
| inode->i_ctime = current_time(inode); |
| ihold(inode); |
| |
| set_inode_flag(inode, FI_INC_LINK); |
| f2fs_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| if (err) |
| goto out; |
| f2fs_unlock_op(sbi); |
| |
| d_instantiate(dentry, inode); |
| |
| if (IS_DIRSYNC(dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| return 0; |
| out: |
| clear_inode_flag(inode, FI_INC_LINK); |
| iput(inode); |
| f2fs_unlock_op(sbi); |
| return err; |
| } |
| |
| struct dentry *f2fs_get_parent(struct dentry *child) |
| { |
| struct qstr dotdot = QSTR_INIT("..", 2); |
| struct page *page; |
| unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page); |
| if (!ino) { |
| if (IS_ERR(page)) |
| return ERR_CAST(page); |
| return ERR_PTR(-ENOENT); |
| } |
| return d_obtain_alias(f2fs_iget(child->d_sb, ino)); |
| } |
| |
| static int __recover_dot_dentries(struct inode *dir, nid_t pino) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct qstr dot = QSTR_INIT(".", 1); |
| struct qstr dotdot = QSTR_INIT("..", 2); |
| struct f2fs_dir_entry *de; |
| struct page *page; |
| int err = 0; |
| |
| if (f2fs_readonly(sbi->sb)) { |
| f2fs_msg(sbi->sb, KERN_INFO, |
| "skip recovering inline_dots inode (ino:%lu, pino:%u) " |
| "in readonly mountpoint", dir->i_ino, pino); |
| return 0; |
| } |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| f2fs_balance_fs(sbi, true); |
| |
| f2fs_lock_op(sbi); |
| |
| de = f2fs_find_entry(dir, &dot, &page); |
| if (de) { |
| f2fs_dentry_kunmap(dir, page); |
| f2fs_put_page(page, 0); |
| } else if (IS_ERR(page)) { |
| err = PTR_ERR(page); |
| goto out; |
| } else { |
| err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); |
| if (err) |
| goto out; |
| } |
| |
| de = f2fs_find_entry(dir, &dotdot, &page); |
| if (de) { |
| f2fs_dentry_kunmap(dir, page); |
| f2fs_put_page(page, 0); |
| } else if (IS_ERR(page)) { |
| err = PTR_ERR(page); |
| } else { |
| err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR); |
| } |
| out: |
| if (!err) |
| clear_inode_flag(dir, FI_INLINE_DOTS); |
| |
| f2fs_unlock_op(sbi); |
| return err; |
| } |
| |
| static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags) |
| { |
| struct inode *inode = NULL; |
| struct f2fs_dir_entry *de; |
| struct page *page; |
| struct dentry *new; |
| nid_t ino = -1; |
| int err = 0; |
| unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir)); |
| |
| trace_f2fs_lookup_start(dir, dentry, flags); |
| |
| if (f2fs_encrypted_inode(dir)) { |
| err = fscrypt_get_encryption_info(dir); |
| |
| /* |
| * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is |
| * created while the directory was encrypted and we |
| * don't have access to the key. |
| */ |
| if (fscrypt_has_encryption_key(dir)) |
| fscrypt_set_encrypted_dentry(dentry); |
| fscrypt_set_d_op(dentry); |
| if (err && err != -ENOKEY) |
| goto out; |
| } |
| |
| if (dentry->d_name.len > F2FS_NAME_LEN) { |
| err = -ENAMETOOLONG; |
| goto out; |
| } |
| |
| de = f2fs_find_entry(dir, &dentry->d_name, &page); |
| if (!de) { |
| if (IS_ERR(page)) { |
| err = PTR_ERR(page); |
| goto out; |
| } |
| goto out_splice; |
| } |
| |
| ino = le32_to_cpu(de->ino); |
| f2fs_dentry_kunmap(dir, page); |
| f2fs_put_page(page, 0); |
| |
| inode = f2fs_iget(dir->i_sb, ino); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto out; |
| } |
| |
| if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) { |
| err = __recover_dot_dentries(dir, root_ino); |
| if (err) |
| goto out_iput; |
| } |
| |
| if (f2fs_has_inline_dots(inode)) { |
| err = __recover_dot_dentries(inode, dir->i_ino); |
| if (err) |
| goto out_iput; |
| } |
| if (f2fs_encrypted_inode(dir) && |
| (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
| !fscrypt_has_permitted_context(dir, inode)) { |
| f2fs_msg(inode->i_sb, KERN_WARNING, |
| "Inconsistent encryption contexts: %lu/%lu", |
| dir->i_ino, inode->i_ino); |
| err = -EPERM; |
| goto out_iput; |
| } |
| out_splice: |
| new = d_splice_alias(inode, dentry); |
| if (IS_ERR(new)) |
| err = PTR_ERR(new); |
| trace_f2fs_lookup_end(dir, dentry, ino, err); |
| return new; |
| out_iput: |
| iput(inode); |
| out: |
| trace_f2fs_lookup_end(dir, dentry, ino, err); |
| return ERR_PTR(err); |
| } |
| |
| static int f2fs_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct inode *inode = d_inode(dentry); |
| struct f2fs_dir_entry *de; |
| struct page *page; |
| int err = -ENOENT; |
| |
| trace_f2fs_unlink_enter(dir, dentry); |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| err = dquot_initialize(inode); |
| if (err) |
| return err; |
| |
| de = f2fs_find_entry(dir, &dentry->d_name, &page); |
| if (!de) { |
| if (IS_ERR(page)) |
| err = PTR_ERR(page); |
| goto fail; |
| } |
| |
| f2fs_balance_fs(sbi, true); |
| |
| f2fs_lock_op(sbi); |
| err = acquire_orphan_inode(sbi); |
| if (err) { |
| f2fs_unlock_op(sbi); |
| f2fs_dentry_kunmap(dir, page); |
| f2fs_put_page(page, 0); |
| goto fail; |
| } |
| f2fs_delete_entry(de, page, dir, inode); |
| f2fs_unlock_op(sbi); |
| |
| if (IS_DIRSYNC(dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| fail: |
| trace_f2fs_unlink_exit(inode, err); |
| return err; |
| } |
| |
| static const char *f2fs_get_link(struct dentry *dentry, |
| struct inode *inode, |
| struct delayed_call *done) |
| { |
| const char *link = page_get_link(dentry, inode, done); |
| if (!IS_ERR(link) && !*link) { |
| /* this is broken symlink case */ |
| do_delayed_call(done); |
| clear_delayed_call(done); |
| link = ERR_PTR(-ENOENT); |
| } |
| return link; |
| } |
| |
| static int f2fs_symlink(struct inode *dir, struct dentry *dentry, |
| const char *symname) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct inode *inode; |
| size_t len = strlen(symname); |
| struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1); |
| struct fscrypt_symlink_data *sd = NULL; |
| int err; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| if (f2fs_encrypted_inode(dir)) { |
| err = fscrypt_get_encryption_info(dir); |
| if (err) |
| return err; |
| |
| if (!fscrypt_has_encryption_key(dir)) |
| return -ENOKEY; |
| |
| disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + |
| sizeof(struct fscrypt_symlink_data)); |
| } |
| |
| if (disk_link.len > dir->i_sb->s_blocksize) |
| return -ENAMETOOLONG; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| if (f2fs_encrypted_inode(inode)) |
| inode->i_op = &f2fs_encrypted_symlink_inode_operations; |
| else |
| inode->i_op = &f2fs_symlink_inode_operations; |
| inode_nohighmem(inode); |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| |
| f2fs_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| if (err) |
| goto out; |
| f2fs_unlock_op(sbi); |
| alloc_nid_done(sbi, inode->i_ino); |
| |
| if (f2fs_encrypted_inode(inode)) { |
| struct qstr istr = QSTR_INIT(symname, len); |
| struct fscrypt_str ostr; |
| |
| sd = kzalloc(disk_link.len, GFP_NOFS); |
| if (!sd) { |
| err = -ENOMEM; |
| goto err_out; |
| } |
| |
| err = fscrypt_get_encryption_info(inode); |
| if (err) |
| goto err_out; |
| |
| if (!fscrypt_has_encryption_key(inode)) { |
| err = -ENOKEY; |
| goto err_out; |
| } |
| |
| ostr.name = sd->encrypted_path; |
| ostr.len = disk_link.len; |
| err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); |
| if (err) |
| goto err_out; |
| |
| sd->len = cpu_to_le16(ostr.len); |
| disk_link.name = (char *)sd; |
| } |
| |
| err = page_symlink(inode, disk_link.name, disk_link.len); |
| |
| err_out: |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| |
| /* |
| * Let's flush symlink data in order to avoid broken symlink as much as |
| * possible. Nevertheless, fsyncing is the best way, but there is no |
| * way to get a file descriptor in order to flush that. |
| * |
| * Note that, it needs to do dir->fsync to make this recoverable. |
| * If the symlink path is stored into inline_data, there is no |
| * performance regression. |
| */ |
| if (!err) { |
| filemap_write_and_wait_range(inode->i_mapping, 0, |
| disk_link.len - 1); |
| |
| if (IS_DIRSYNC(dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| } else { |
| f2fs_unlink(dir, dentry); |
| } |
| |
| kfree(sd); |
| |
| f2fs_balance_fs(sbi, true); |
| return err; |
| out: |
| handle_failed_inode(inode); |
| return err; |
| } |
| |
| static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct inode *inode; |
| int err; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| inode = f2fs_new_inode(dir, S_IFDIR | mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| inode->i_op = &f2fs_dir_inode_operations; |
| inode->i_fop = &f2fs_dir_operations; |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO); |
| |
| set_inode_flag(inode, FI_INC_LINK); |
| f2fs_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| if (err) |
| goto out_fail; |
| f2fs_unlock_op(sbi); |
| |
| alloc_nid_done(sbi, inode->i_ino); |
| |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| |
| if (IS_DIRSYNC(dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| |
| f2fs_balance_fs(sbi, true); |
| return 0; |
| |
| out_fail: |
| clear_inode_flag(inode, FI_INC_LINK); |
| handle_failed_inode(inode); |
| return err; |
| } |
| |
| static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) |
| { |
| struct inode *inode = d_inode(dentry); |
| if (f2fs_empty_dir(inode)) |
| return f2fs_unlink(dir, dentry); |
| return -ENOTEMPTY; |
| } |
| |
| static int f2fs_mknod(struct inode *dir, struct dentry *dentry, |
| umode_t mode, dev_t rdev) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct inode *inode; |
| int err = 0; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| inode = f2fs_new_inode(dir, mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| init_special_inode(inode, inode->i_mode, rdev); |
| inode->i_op = &f2fs_special_inode_operations; |
| |
| f2fs_lock_op(sbi); |
| err = f2fs_add_link(dentry, inode); |
| if (err) |
| goto out; |
| f2fs_unlock_op(sbi); |
| |
| alloc_nid_done(sbi, inode->i_ino); |
| |
| d_instantiate(dentry, inode); |
| unlock_new_inode(inode); |
| |
| if (IS_DIRSYNC(dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| |
| f2fs_balance_fs(sbi, true); |
| return 0; |
| out: |
| handle_failed_inode(inode); |
| return err; |
| } |
| |
| static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry, |
| umode_t mode, struct inode **whiteout) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| struct inode *inode; |
| int err; |
| |
| err = dquot_initialize(dir); |
| if (err) |
| return err; |
| |
| inode = f2fs_new_inode(dir, mode); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| if (whiteout) { |
| init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); |
| inode->i_op = &f2fs_special_inode_operations; |
| } else { |
| inode->i_op = &f2fs_file_inode_operations; |
| inode->i_fop = &f2fs_file_operations; |
| inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| } |
| |
| f2fs_lock_op(sbi); |
| err = acquire_orphan_inode(sbi); |
| if (err) |
| goto out; |
| |
| err = f2fs_do_tmpfile(inode, dir); |
| if (err) |
| goto release_out; |
| |
| /* |
| * add this non-linked tmpfile to orphan list, in this way we could |
| * remove all unused data of tmpfile after abnormal power-off. |
| */ |
| add_orphan_inode(inode); |
| alloc_nid_done(sbi, inode->i_ino); |
| |
| if (whiteout) { |
| f2fs_i_links_write(inode, false); |
| *whiteout = inode; |
| } else { |
| d_tmpfile(dentry, inode); |
| } |
| /* link_count was changed by d_tmpfile as well. */ |
| f2fs_unlock_op(sbi); |
| unlock_new_inode(inode); |
| |
| f2fs_balance_fs(sbi, true); |
| return 0; |
| |
| release_out: |
| release_orphan_inode(sbi); |
| out: |
| handle_failed_inode(inode); |
| return err; |
| } |
| |
| static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| { |
| if (unlikely(f2fs_cp_error(F2FS_I_SB(dir)))) |
| return -EIO; |
| |
| if (f2fs_encrypted_inode(dir)) { |
| int err = fscrypt_get_encryption_info(dir); |
| if (err) |
| return err; |
| } |
| |
| return __f2fs_tmpfile(dir, dentry, mode, NULL); |
| } |
| |
| static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout) |
| { |
| if (unlikely(f2fs_cp_error(F2FS_I_SB(dir)))) |
| return -EIO; |
| |
| return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout); |
| } |
| |
| static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); |
| struct inode *old_inode = d_inode(old_dentry); |
| struct inode *new_inode = d_inode(new_dentry); |
| struct inode *whiteout = NULL; |
| struct page *old_dir_page; |
| struct page *old_page, *new_page = NULL; |
| struct f2fs_dir_entry *old_dir_entry = NULL; |
| struct f2fs_dir_entry *old_entry; |
| struct f2fs_dir_entry *new_entry; |
| bool is_old_inline = f2fs_has_inline_dentry(old_dir); |
| int err = -ENOENT; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| if ((f2fs_encrypted_inode(old_dir) && |
| !fscrypt_has_encryption_key(old_dir)) || |
| (f2fs_encrypted_inode(new_dir) && |
| !fscrypt_has_encryption_key(new_dir))) |
| return -ENOKEY; |
| |
| if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) && |
| !fscrypt_has_permitted_context(new_dir, old_inode)) { |
| err = -EPERM; |
| goto out; |
| } |
| |
| if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && |
| (!projid_eq(F2FS_I(new_dir)->i_projid, |
| F2FS_I(old_dentry->d_inode)->i_projid))) |
| return -EXDEV; |
| |
| err = dquot_initialize(old_dir); |
| if (err) |
| goto out; |
| |
| err = dquot_initialize(new_dir); |
| if (err) |
| goto out; |
| |
| if (new_inode) { |
| err = dquot_initialize(new_inode); |
| if (err) |
| goto out; |
| } |
| |
| old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
| if (!old_entry) { |
| if (IS_ERR(old_page)) |
| err = PTR_ERR(old_page); |
| goto out; |
| } |
| |
| if (S_ISDIR(old_inode->i_mode)) { |
| old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); |
| if (!old_dir_entry) { |
| if (IS_ERR(old_dir_page)) |
| err = PTR_ERR(old_dir_page); |
| goto out_old; |
| } |
| } |
| |
| if (flags & RENAME_WHITEOUT) { |
| err = f2fs_create_whiteout(old_dir, &whiteout); |
| if (err) |
| goto out_dir; |
| } |
| |
| if (new_inode) { |
| |
| err = -ENOTEMPTY; |
| if (old_dir_entry && !f2fs_empty_dir(new_inode)) |
| goto out_whiteout; |
| |
| err = -ENOENT; |
| new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, |
| &new_page); |
| if (!new_entry) { |
| if (IS_ERR(new_page)) |
| err = PTR_ERR(new_page); |
| goto out_whiteout; |
| } |
| |
| f2fs_balance_fs(sbi, true); |
| |
| f2fs_lock_op(sbi); |
| |
| err = acquire_orphan_inode(sbi); |
| if (err) |
| goto put_out_dir; |
| |
| f2fs_set_link(new_dir, new_entry, new_page, old_inode); |
| |
| new_inode->i_ctime = current_time(new_inode); |
| down_write(&F2FS_I(new_inode)->i_sem); |
| if (old_dir_entry) |
| f2fs_i_links_write(new_inode, false); |
| f2fs_i_links_write(new_inode, false); |
| up_write(&F2FS_I(new_inode)->i_sem); |
| |
| if (!new_inode->i_nlink) |
| add_orphan_inode(new_inode); |
| else |
| release_orphan_inode(sbi); |
| } else { |
| f2fs_balance_fs(sbi, true); |
| |
| f2fs_lock_op(sbi); |
| |
| err = f2fs_add_link(new_dentry, old_inode); |
| if (err) { |
| f2fs_unlock_op(sbi); |
| goto out_whiteout; |
| } |
| |
| if (old_dir_entry) |
| f2fs_i_links_write(new_dir, true); |
| |
| /* |
| * old entry and new entry can locate in the same inline |
| * dentry in inode, when attaching new entry in inline dentry, |
| * it could force inline dentry conversion, after that, |
| * old_entry and old_page will point to wrong address, in |
| * order to avoid this, let's do the check and update here. |
| */ |
| if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) { |
| f2fs_put_page(old_page, 0); |
| old_page = NULL; |
| |
| old_entry = f2fs_find_entry(old_dir, |
| &old_dentry->d_name, &old_page); |
| if (!old_entry) { |
| err = -ENOENT; |
| if (IS_ERR(old_page)) |
| err = PTR_ERR(old_page); |
| f2fs_unlock_op(sbi); |
| goto out_whiteout; |
| } |
| } |
| } |
| |
| down_write(&F2FS_I(old_inode)->i_sem); |
| if (!old_dir_entry || whiteout) |
| file_lost_pino(old_inode); |
| else |
| F2FS_I(old_inode)->i_pino = new_dir->i_ino; |
| up_write(&F2FS_I(old_inode)->i_sem); |
| |
| old_inode->i_ctime = current_time(old_inode); |
| f2fs_mark_inode_dirty_sync(old_inode, false); |
| |
| f2fs_delete_entry(old_entry, old_page, old_dir, NULL); |
| |
| if (whiteout) { |
| whiteout->i_state |= I_LINKABLE; |
| set_inode_flag(whiteout, FI_INC_LINK); |
| err = f2fs_add_link(old_dentry, whiteout); |
| if (err) |
| goto put_out_dir; |
| whiteout->i_state &= ~I_LINKABLE; |
| iput(whiteout); |
| } |
| |
| if (old_dir_entry) { |
| if (old_dir != new_dir && !whiteout) { |
| f2fs_set_link(old_inode, old_dir_entry, |
| old_dir_page, new_dir); |
| } else { |
| f2fs_dentry_kunmap(old_inode, old_dir_page); |
| f2fs_put_page(old_dir_page, 0); |
| } |
| f2fs_i_links_write(old_dir, false); |
| } |
| |
| f2fs_unlock_op(sbi); |
| |
| if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| return 0; |
| |
| put_out_dir: |
| f2fs_unlock_op(sbi); |
| if (new_page) { |
| f2fs_dentry_kunmap(new_dir, new_page); |
| f2fs_put_page(new_page, 0); |
| } |
| out_whiteout: |
| if (whiteout) |
| iput(whiteout); |
| out_dir: |
| if (old_dir_entry) { |
| f2fs_dentry_kunmap(old_inode, old_dir_page); |
| f2fs_put_page(old_dir_page, 0); |
| } |
| out_old: |
| f2fs_dentry_kunmap(old_dir, old_page); |
| f2fs_put_page(old_page, 0); |
| out: |
| return err; |
| } |
| |
| static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); |
| struct inode *old_inode = d_inode(old_dentry); |
| struct inode *new_inode = d_inode(new_dentry); |
| struct page *old_dir_page, *new_dir_page; |
| struct page *old_page, *new_page; |
| struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; |
| struct f2fs_dir_entry *old_entry, *new_entry; |
| int old_nlink = 0, new_nlink = 0; |
| int err = -ENOENT; |
| |
| if (unlikely(f2fs_cp_error(sbi))) |
| return -EIO; |
| |
| if ((f2fs_encrypted_inode(old_dir) && |
| !fscrypt_has_encryption_key(old_dir)) || |
| (f2fs_encrypted_inode(new_dir) && |
| !fscrypt_has_encryption_key(new_dir))) |
| return -ENOKEY; |
| |
| if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) && |
| (old_dir != new_dir) && |
| (!fscrypt_has_permitted_context(new_dir, old_inode) || |
| !fscrypt_has_permitted_context(old_dir, new_inode))) |
| return -EPERM; |
| |
| if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && |
| !projid_eq(F2FS_I(new_dir)->i_projid, |
| F2FS_I(old_dentry->d_inode)->i_projid)) || |
| (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && |
| !projid_eq(F2FS_I(old_dir)->i_projid, |
| F2FS_I(new_dentry->d_inode)->i_projid))) |
| return -EXDEV; |
| |
| err = dquot_initialize(old_dir); |
| if (err) |
| goto out; |
| |
| err = dquot_initialize(new_dir); |
| if (err) |
| goto out; |
| |
| old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
| if (!old_entry) { |
| if (IS_ERR(old_page)) |
| err = PTR_ERR(old_page); |
| goto out; |
| } |
| |
| new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
| if (!new_entry) { |
| if (IS_ERR(new_page)) |
| err = PTR_ERR(new_page); |
| goto out_old; |
| } |
| |
| /* prepare for updating ".." directory entry info later */ |
| if (old_dir != new_dir) { |
| if (S_ISDIR(old_inode->i_mode)) { |
| old_dir_entry = f2fs_parent_dir(old_inode, |
| &old_dir_page); |
| if (!old_dir_entry) { |
| if (IS_ERR(old_dir_page)) |
| err = PTR_ERR(old_dir_page); |
| goto out_new; |
| } |
| } |
| |
| if (S_ISDIR(new_inode->i_mode)) { |
| new_dir_entry = f2fs_parent_dir(new_inode, |
| &new_dir_page); |
| if (!new_dir_entry) { |
| if (IS_ERR(new_dir_page)) |
| err = PTR_ERR(new_dir_page); |
| goto out_old_dir; |
| } |
| } |
| } |
| |
| /* |
| * If cross rename between file and directory those are not |
| * in the same directory, we will inc nlink of file's parent |
| * later, so we should check upper boundary of its nlink. |
| */ |
| if ((!old_dir_entry || !new_dir_entry) && |
| old_dir_entry != new_dir_entry) { |
| old_nlink = old_dir_entry ? -1 : 1; |
| new_nlink = -old_nlink; |
| err = -EMLINK; |
| if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) || |
| (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX)) |
| goto out_new_dir; |
| } |
| |
| f2fs_balance_fs(sbi, true); |
| |
| f2fs_lock_op(sbi); |
| |
| /* update ".." directory entry info of old dentry */ |
| if (old_dir_entry) |
| f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); |
| |
| /* update ".." directory entry info of new dentry */ |
| if (new_dir_entry) |
| f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); |
| |
| /* update directory entry info of old dir inode */ |
| f2fs_set_link(old_dir, old_entry, old_page, new_inode); |
| |
| down_write(&F2FS_I(old_inode)->i_sem); |
| file_lost_pino(old_inode); |
| up_write(&F2FS_I(old_inode)->i_sem); |
| |
| old_dir->i_ctime = current_time(old_dir); |
| if (old_nlink) { |
| down_write(&F2FS_I(old_dir)->i_sem); |
| f2fs_i_links_write(old_dir, old_nlink > 0); |
| up_write(&F2FS_I(old_dir)->i_sem); |
| } |
| f2fs_mark_inode_dirty_sync(old_dir, false); |
| |
| /* update directory entry info of new dir inode */ |
| f2fs_set_link(new_dir, new_entry, new_page, old_inode); |
| |
| down_write(&F2FS_I(new_inode)->i_sem); |
| file_lost_pino(new_inode); |
| up_write(&F2FS_I(new_inode)->i_sem); |
| |
| new_dir->i_ctime = current_time(new_dir); |
| if (new_nlink) { |
| down_write(&F2FS_I(new_dir)->i_sem); |
| f2fs_i_links_write(new_dir, new_nlink > 0); |
| up_write(&F2FS_I(new_dir)->i_sem); |
| } |
| f2fs_mark_inode_dirty_sync(new_dir, false); |
| |
| f2fs_unlock_op(sbi); |
| |
| if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) |
| f2fs_sync_fs(sbi->sb, 1); |
| return 0; |
| out_new_dir: |
| if (new_dir_entry) { |
| f2fs_dentry_kunmap(new_inode, new_dir_page); |
| f2fs_put_page(new_dir_page, 0); |
| } |
| out_old_dir: |
| if (old_dir_entry) { |
| f2fs_dentry_kunmap(old_inode, old_dir_page); |
| f2fs_put_page(old_dir_page, 0); |
| } |
| out_new: |
| f2fs_dentry_kunmap(new_dir, new_page); |
| f2fs_put_page(new_page, 0); |
| out_old: |
| f2fs_dentry_kunmap(old_dir, old_page); |
| f2fs_put_page(old_page, 0); |
| out: |
| return err; |
| } |
| |
| static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags) |
| { |
| if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
| return -EINVAL; |
| |
| if (flags & RENAME_EXCHANGE) { |
| return f2fs_cross_rename(old_dir, old_dentry, |
| new_dir, new_dentry); |
| } |
| /* |
| * VFS has already handled the new dentry existence case, |
| * here, we just deal with "RENAME_NOREPLACE" as regular rename. |
| */ |
| return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
| } |
| |
| static const char *f2fs_encrypted_get_link(struct dentry *dentry, |
| struct inode *inode, |
| struct delayed_call *done) |
| { |
| struct page *cpage = NULL; |
| char *caddr, *paddr = NULL; |
| struct fscrypt_str cstr = FSTR_INIT(NULL, 0); |
| struct fscrypt_str pstr = FSTR_INIT(NULL, 0); |
| struct fscrypt_symlink_data *sd; |
| u32 max_size = inode->i_sb->s_blocksize; |
| int res; |
| |
| if (!dentry) |
| return ERR_PTR(-ECHILD); |
| |
| res = fscrypt_get_encryption_info(inode); |
| if (res) |
| return ERR_PTR(res); |
| |
| cpage = read_mapping_page(inode->i_mapping, 0, NULL); |
| if (IS_ERR(cpage)) |
| return ERR_CAST(cpage); |
| caddr = page_address(cpage); |
| |
| /* Symlink is encrypted */ |
| sd = (struct fscrypt_symlink_data *)caddr; |
| cstr.name = sd->encrypted_path; |
| cstr.len = le16_to_cpu(sd->len); |
| |
| /* this is broken symlink case */ |
| if (unlikely(cstr.len == 0)) { |
| res = -ENOENT; |
| goto errout; |
| } |
| |
| if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) { |
| /* Symlink data on the disk is corrupted */ |
| res = -EIO; |
| goto errout; |
| } |
| res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr); |
| if (res) |
| goto errout; |
| |
| res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr); |
| if (res) |
| goto errout; |
| |
| /* this is broken symlink case */ |
| if (unlikely(pstr.name[0] == 0)) { |
| res = -ENOENT; |
| goto errout; |
| } |
| |
| paddr = pstr.name; |
| |
| /* Null-terminate the name */ |
| paddr[pstr.len] = '\0'; |
| |
| put_page(cpage); |
| set_delayed_call(done, kfree_link, paddr); |
| return paddr; |
| errout: |
| fscrypt_fname_free_buffer(&pstr); |
| put_page(cpage); |
| return ERR_PTR(res); |
| } |
| |
| const struct inode_operations f2fs_encrypted_symlink_inode_operations = { |
| .readlink = generic_readlink, |
| .get_link = f2fs_encrypted_get_link, |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .listxattr = f2fs_listxattr, |
| #endif |
| }; |
| |
| const struct inode_operations f2fs_dir_inode_operations = { |
| .create = f2fs_create, |
| .lookup = f2fs_lookup, |
| .link = f2fs_link, |
| .unlink = f2fs_unlink, |
| .symlink = f2fs_symlink, |
| .mkdir = f2fs_mkdir, |
| .rmdir = f2fs_rmdir, |
| .mknod = f2fs_mknod, |
| .rename = f2fs_rename2, |
| .tmpfile = f2fs_tmpfile, |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| .get_acl = f2fs_get_acl, |
| .set_acl = f2fs_set_acl, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .listxattr = f2fs_listxattr, |
| #endif |
| }; |
| |
| const struct inode_operations f2fs_symlink_inode_operations = { |
| .readlink = generic_readlink, |
| .get_link = f2fs_get_link, |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .listxattr = f2fs_listxattr, |
| #endif |
| }; |
| |
| const struct inode_operations f2fs_special_inode_operations = { |
| .getattr = f2fs_getattr, |
| .setattr = f2fs_setattr, |
| .get_acl = f2fs_get_acl, |
| .set_acl = f2fs_set_acl, |
| #ifdef CONFIG_F2FS_FS_XATTR |
| .listxattr = f2fs_listxattr, |
| #endif |
| }; |