1060 lines
24 KiB
C
1060 lines
24 KiB
C
/*
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* fs/f2fs/namei.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include <linux/ctype.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include "f2fs.h"
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#include "node.h"
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#include "xattr.h"
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#include "acl.h"
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#include <trace/events/f2fs.h>
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static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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nid_t ino;
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struct inode *inode;
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bool nid_free = false;
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int err;
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inode = new_inode(dir->i_sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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f2fs_lock_op(sbi);
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if (!alloc_nid(sbi, &ino)) {
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f2fs_unlock_op(sbi);
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err = -ENOSPC;
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goto fail;
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}
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f2fs_unlock_op(sbi);
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inode_init_owner(inode, dir, mode);
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inode->i_ino = ino;
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inode->i_blocks = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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inode->i_generation = sbi->s_next_generation++;
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err = insert_inode_locked(inode);
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if (err) {
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err = -EINVAL;
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nid_free = true;
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goto fail;
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}
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/* If the directory encrypted, then we should encrypt the inode. */
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if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
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f2fs_set_encrypted_inode(inode);
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if (f2fs_may_inline_data(inode))
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set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
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if (f2fs_may_inline_dentry(inode))
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set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
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f2fs_init_extent_tree(inode, NULL);
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stat_inc_inline_xattr(inode);
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stat_inc_inline_inode(inode);
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stat_inc_inline_dir(inode);
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trace_f2fs_new_inode(inode, 0);
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mark_inode_dirty(inode);
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return inode;
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fail:
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trace_f2fs_new_inode(inode, err);
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make_bad_inode(inode);
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if (nid_free)
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set_inode_flag(F2FS_I(inode), FI_FREE_NID);
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iput(inode);
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return ERR_PTR(err);
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}
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static int is_multimedia_file(const unsigned char *s, const char *sub)
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{
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size_t slen = strlen(s);
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size_t sublen = strlen(sub);
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/*
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* filename format of multimedia file should be defined as:
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* "filename + '.' + extension".
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*/
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if (slen < sublen + 2)
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return 0;
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if (s[slen - sublen - 1] != '.')
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return 0;
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return !strncasecmp(s + slen - sublen, sub, sublen);
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}
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/*
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* Set multimedia files as cold files for hot/cold data separation
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*/
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static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
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const unsigned char *name)
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{
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int i;
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__u8 (*extlist)[8] = sbi->raw_super->extension_list;
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int count = le32_to_cpu(sbi->raw_super->extension_count);
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for (i = 0; i < count; i++) {
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if (is_multimedia_file(name, extlist[i])) {
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file_set_cold(inode);
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break;
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}
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}
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}
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static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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bool excl)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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struct inode *inode;
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nid_t ino = 0;
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int err;
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inode = f2fs_new_inode(dir, mode);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
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set_cold_files(sbi, inode, dentry->d_name.name);
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inode->i_op = &f2fs_file_inode_operations;
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inode->i_fop = &f2fs_file_operations;
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inode->i_mapping->a_ops = &f2fs_dblock_aops;
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ino = inode->i_ino;
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f2fs_balance_fs(sbi);
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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if (err)
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goto out;
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f2fs_unlock_op(sbi);
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alloc_nid_done(sbi, ino);
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d_instantiate(dentry, inode);
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unlock_new_inode(inode);
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if (IS_DIRSYNC(dir))
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f2fs_sync_fs(sbi->sb, 1);
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return 0;
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out:
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handle_failed_inode(inode);
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return err;
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}
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static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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struct inode *inode = d_inode(old_dentry);
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struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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int err;
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if (f2fs_encrypted_inode(dir) &&
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!f2fs_is_child_context_consistent_with_parent(dir, inode))
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return -EPERM;
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f2fs_balance_fs(sbi);
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inode->i_ctime = CURRENT_TIME;
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ihold(inode);
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set_inode_flag(F2FS_I(inode), FI_INC_LINK);
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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if (err)
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goto out;
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f2fs_unlock_op(sbi);
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d_instantiate(dentry, inode);
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if (IS_DIRSYNC(dir))
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f2fs_sync_fs(sbi->sb, 1);
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return 0;
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out:
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clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
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iput(inode);
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f2fs_unlock_op(sbi);
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return err;
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}
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struct dentry *f2fs_get_parent(struct dentry *child)
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{
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struct qstr dotdot = QSTR_INIT("..", 2);
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unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
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if (!ino)
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return ERR_PTR(-ENOENT);
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return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino));
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}
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static int __recover_dot_dentries(struct inode *dir, nid_t pino)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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struct qstr dot = QSTR_INIT(".", 1);
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struct qstr dotdot = QSTR_INIT("..", 2);
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struct f2fs_dir_entry *de;
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struct page *page;
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int err = 0;
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f2fs_lock_op(sbi);
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de = f2fs_find_entry(dir, &dot, &page);
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if (de) {
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f2fs_dentry_kunmap(dir, page);
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f2fs_put_page(page, 0);
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} else {
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err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
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if (err)
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goto out;
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}
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de = f2fs_find_entry(dir, &dotdot, &page);
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if (de) {
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f2fs_dentry_kunmap(dir, page);
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f2fs_put_page(page, 0);
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} else {
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err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
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}
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out:
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if (!err) {
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clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
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mark_inode_dirty(dir);
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}
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f2fs_unlock_op(sbi);
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return err;
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}
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static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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struct inode *inode = NULL;
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struct f2fs_dir_entry *de;
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struct page *page;
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nid_t ino;
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int err = 0;
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if (dentry->d_name.len > F2FS_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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de = f2fs_find_entry(dir, &dentry->d_name, &page);
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if (!de)
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return d_splice_alias(inode, dentry);
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ino = le32_to_cpu(de->ino);
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f2fs_dentry_kunmap(dir, page);
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f2fs_put_page(page, 0);
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inode = f2fs_iget(dir->i_sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (f2fs_has_inline_dots(inode)) {
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err = __recover_dot_dentries(inode, dir->i_ino);
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if (err)
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goto err_out;
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}
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return d_splice_alias(inode, dentry);
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err_out:
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iget_failed(inode);
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return ERR_PTR(err);
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}
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static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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struct inode *inode = d_inode(dentry);
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struct f2fs_dir_entry *de;
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struct page *page;
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int err = -ENOENT;
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trace_f2fs_unlink_enter(dir, dentry);
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de = f2fs_find_entry(dir, &dentry->d_name, &page);
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if (!de)
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goto fail;
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f2fs_balance_fs(sbi);
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f2fs_lock_op(sbi);
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err = acquire_orphan_inode(sbi);
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if (err) {
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f2fs_unlock_op(sbi);
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f2fs_dentry_kunmap(dir, page);
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f2fs_put_page(page, 0);
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goto fail;
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}
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f2fs_delete_entry(de, page, dir, inode);
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f2fs_unlock_op(sbi);
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/* In order to evict this inode, we set it dirty */
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mark_inode_dirty(inode);
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if (IS_DIRSYNC(dir))
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f2fs_sync_fs(sbi->sb, 1);
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fail:
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trace_f2fs_unlink_exit(inode, err);
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return err;
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}
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static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
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{
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const char *link = page_follow_link_light(dentry, cookie);
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if (!IS_ERR(link) && !*link) {
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/* this is broken symlink case */
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page_put_link(NULL, *cookie);
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link = ERR_PTR(-ENOENT);
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}
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return link;
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}
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static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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struct inode *inode;
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size_t len = strlen(symname);
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size_t p_len;
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char *p_str;
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struct f2fs_str disk_link = FSTR_INIT(NULL, 0);
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struct f2fs_encrypted_symlink_data *sd = NULL;
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int err;
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if (len > dir->i_sb->s_blocksize)
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return -ENAMETOOLONG;
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|
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inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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|
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if (f2fs_encrypted_inode(inode))
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inode->i_op = &f2fs_encrypted_symlink_inode_operations;
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else
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inode->i_op = &f2fs_symlink_inode_operations;
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inode->i_mapping->a_ops = &f2fs_dblock_aops;
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|
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f2fs_balance_fs(sbi);
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|
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f2fs_lock_op(sbi);
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err = f2fs_add_link(dentry, inode);
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if (err)
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goto out;
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f2fs_unlock_op(sbi);
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alloc_nid_done(sbi, inode->i_ino);
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|
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if (f2fs_encrypted_inode(dir)) {
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struct qstr istr = QSTR_INIT(symname, len);
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|
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err = f2fs_get_encryption_info(inode);
|
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if (err)
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goto err_out;
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|
|
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err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link);
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if (err)
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goto err_out;
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|
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err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link);
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if (err < 0)
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goto err_out;
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|
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p_len = encrypted_symlink_data_len(disk_link.len) + 1;
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|
|
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if (p_len > dir->i_sb->s_blocksize) {
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err = -ENAMETOOLONG;
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goto err_out;
|
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}
|
|
|
|
sd = kzalloc(p_len, GFP_NOFS);
|
|
if (!sd) {
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
memcpy(sd->encrypted_path, disk_link.name, disk_link.len);
|
|
sd->len = cpu_to_le16(disk_link.len);
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p_str = (char *)sd;
|
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} else {
|
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p_len = len + 1;
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p_str = (char *)symname;
|
|
}
|
|
|
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err = page_symlink(inode, p_str, p_len);
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|
|
|
err_out:
|
|
d_instantiate(dentry, inode);
|
|
unlock_new_inode(inode);
|
|
|
|
/*
|
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* Let's flush symlink data in order to avoid broken symlink as much as
|
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* 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, p_len - 1);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
f2fs_sync_fs(sbi->sb, 1);
|
|
} else {
|
|
f2fs_unlink(dir, dentry);
|
|
}
|
|
|
|
kfree(sd);
|
|
f2fs_fname_crypto_free_buffer(&disk_link);
|
|
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;
|
|
|
|
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);
|
|
|
|
f2fs_balance_fs(sbi);
|
|
|
|
set_inode_flag(F2FS_I(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);
|
|
return 0;
|
|
|
|
out_fail:
|
|
clear_inode_flag(F2FS_I(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;
|
|
|
|
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_balance_fs(sbi);
|
|
|
|
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);
|
|
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;
|
|
|
|
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_balance_fs(sbi);
|
|
|
|
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(sbi, inode->i_ino);
|
|
f2fs_unlock_op(sbi);
|
|
|
|
alloc_nid_done(sbi, inode->i_ino);
|
|
|
|
if (whiteout) {
|
|
inode_dec_link_count(inode);
|
|
*whiteout = inode;
|
|
} else {
|
|
d_tmpfile(dentry, inode);
|
|
}
|
|
unlock_new_inode(inode);
|
|
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 (f2fs_encrypted_inode(dir)) {
|
|
int err = f2fs_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)
|
|
{
|
|
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;
|
|
int err = -ENOENT;
|
|
|
|
if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
|
|
!f2fs_is_child_context_consistent_with_parent(new_dir,
|
|
old_inode)) {
|
|
err = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
|
|
if (!old_entry)
|
|
goto out;
|
|
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
err = -EIO;
|
|
old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
|
|
if (!old_dir_entry)
|
|
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)
|
|
goto out_whiteout;
|
|
|
|
f2fs_balance_fs(sbi);
|
|
|
|
f2fs_lock_op(sbi);
|
|
|
|
err = acquire_orphan_inode(sbi);
|
|
if (err)
|
|
goto put_out_dir;
|
|
|
|
if (update_dent_inode(old_inode, new_inode,
|
|
&new_dentry->d_name)) {
|
|
release_orphan_inode(sbi);
|
|
goto put_out_dir;
|
|
}
|
|
|
|
f2fs_set_link(new_dir, new_entry, new_page, old_inode);
|
|
|
|
new_inode->i_ctime = CURRENT_TIME;
|
|
down_write(&F2FS_I(new_inode)->i_sem);
|
|
if (old_dir_entry)
|
|
drop_nlink(new_inode);
|
|
drop_nlink(new_inode);
|
|
up_write(&F2FS_I(new_inode)->i_sem);
|
|
|
|
mark_inode_dirty(new_inode);
|
|
|
|
if (!new_inode->i_nlink)
|
|
add_orphan_inode(sbi, new_inode->i_ino);
|
|
else
|
|
release_orphan_inode(sbi);
|
|
|
|
update_inode_page(old_inode);
|
|
update_inode_page(new_inode);
|
|
} else {
|
|
f2fs_balance_fs(sbi);
|
|
|
|
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) {
|
|
inc_nlink(new_dir);
|
|
update_inode_page(new_dir);
|
|
}
|
|
}
|
|
|
|
down_write(&F2FS_I(old_inode)->i_sem);
|
|
file_lost_pino(old_inode);
|
|
if (new_inode && file_enc_name(new_inode))
|
|
file_set_enc_name(old_inode);
|
|
up_write(&F2FS_I(old_inode)->i_sem);
|
|
|
|
old_inode->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(old_inode);
|
|
|
|
f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
|
|
|
|
if (whiteout) {
|
|
whiteout->i_state |= I_LINKABLE;
|
|
set_inode_flag(F2FS_I(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);
|
|
update_inode_page(old_inode);
|
|
} else {
|
|
f2fs_dentry_kunmap(old_inode, old_dir_page);
|
|
f2fs_put_page(old_dir_page, 0);
|
|
}
|
|
drop_nlink(old_dir);
|
|
mark_inode_dirty(old_dir);
|
|
update_inode_page(old_dir);
|
|
}
|
|
|
|
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 ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
|
|
(old_dir != new_dir) &&
|
|
(!f2fs_is_child_context_consistent_with_parent(new_dir,
|
|
old_inode) ||
|
|
!f2fs_is_child_context_consistent_with_parent(old_dir,
|
|
new_inode)))
|
|
return -EPERM;
|
|
|
|
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
|
|
if (!old_entry)
|
|
goto out;
|
|
|
|
new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
|
|
if (!new_entry)
|
|
goto out_old;
|
|
|
|
/* prepare for updating ".." directory entry info later */
|
|
if (old_dir != new_dir) {
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
err = -EIO;
|
|
old_dir_entry = f2fs_parent_dir(old_inode,
|
|
&old_dir_page);
|
|
if (!old_dir_entry)
|
|
goto out_new;
|
|
}
|
|
|
|
if (S_ISDIR(new_inode->i_mode)) {
|
|
err = -EIO;
|
|
new_dir_entry = f2fs_parent_dir(new_inode,
|
|
&new_dir_page);
|
|
if (!new_dir_entry)
|
|
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_inode->i_nlink >= F2FS_LINK_MAX) ||
|
|
(new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
|
|
goto out_new_dir;
|
|
}
|
|
|
|
f2fs_balance_fs(sbi);
|
|
|
|
f2fs_lock_op(sbi);
|
|
|
|
err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
|
|
if (err)
|
|
goto out_unlock;
|
|
if (file_enc_name(new_inode))
|
|
file_set_enc_name(old_inode);
|
|
|
|
err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
|
|
if (err)
|
|
goto out_undo;
|
|
if (file_enc_name(old_inode))
|
|
file_set_enc_name(new_inode);
|
|
|
|
/* 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);
|
|
|
|
update_inode_page(old_inode);
|
|
|
|
old_dir->i_ctime = CURRENT_TIME;
|
|
if (old_nlink) {
|
|
down_write(&F2FS_I(old_dir)->i_sem);
|
|
if (old_nlink < 0)
|
|
drop_nlink(old_dir);
|
|
else
|
|
inc_nlink(old_dir);
|
|
up_write(&F2FS_I(old_dir)->i_sem);
|
|
}
|
|
mark_inode_dirty(old_dir);
|
|
update_inode_page(old_dir);
|
|
|
|
/* 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);
|
|
|
|
update_inode_page(new_inode);
|
|
|
|
new_dir->i_ctime = CURRENT_TIME;
|
|
if (new_nlink) {
|
|
down_write(&F2FS_I(new_dir)->i_sem);
|
|
if (new_nlink < 0)
|
|
drop_nlink(new_dir);
|
|
else
|
|
inc_nlink(new_dir);
|
|
up_write(&F2FS_I(new_dir)->i_sem);
|
|
}
|
|
mark_inode_dirty(new_dir);
|
|
update_inode_page(new_dir);
|
|
|
|
f2fs_unlock_op(sbi);
|
|
|
|
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
|
|
f2fs_sync_fs(sbi->sb, 1);
|
|
return 0;
|
|
out_undo:
|
|
/*
|
|
* Still we may fail to recover name info of f2fs_inode here
|
|
* Drop it, once its name is set as encrypted
|
|
*/
|
|
update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
|
|
out_unlock:
|
|
f2fs_unlock_op(sbi);
|
|
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);
|
|
}
|
|
|
|
#ifdef CONFIG_F2FS_FS_ENCRYPTION
|
|
static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
|
|
{
|
|
struct page *cpage = NULL;
|
|
char *caddr, *paddr = NULL;
|
|
struct f2fs_str cstr;
|
|
struct f2fs_str pstr = FSTR_INIT(NULL, 0);
|
|
struct inode *inode = d_inode(dentry);
|
|
struct f2fs_encrypted_symlink_data *sd;
|
|
loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
|
|
u32 max_size = inode->i_sb->s_blocksize;
|
|
int res;
|
|
|
|
res = f2fs_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 = kmap(cpage);
|
|
caddr[size] = 0;
|
|
|
|
/* Symlink is encrypted */
|
|
sd = (struct f2fs_encrypted_symlink_data *)caddr;
|
|
cstr.len = le16_to_cpu(sd->len);
|
|
cstr.name = kmalloc(cstr.len, GFP_NOFS);
|
|
if (!cstr.name) {
|
|
res = -ENOMEM;
|
|
goto errout;
|
|
}
|
|
memcpy(cstr.name, sd->encrypted_path, cstr.len);
|
|
|
|
/* this is broken symlink case */
|
|
if (cstr.name[0] == 0 && cstr.len == 0) {
|
|
res = -ENOENT;
|
|
goto errout;
|
|
}
|
|
|
|
if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
|
|
max_size) {
|
|
/* Symlink data on the disk is corrupted */
|
|
res = -EIO;
|
|
goto errout;
|
|
}
|
|
res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
|
|
if (res)
|
|
goto errout;
|
|
|
|
res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
|
|
if (res < 0)
|
|
goto errout;
|
|
|
|
kfree(cstr.name);
|
|
|
|
paddr = pstr.name;
|
|
|
|
/* Null-terminate the name */
|
|
paddr[res] = '\0';
|
|
|
|
kunmap(cpage);
|
|
page_cache_release(cpage);
|
|
return *cookie = paddr;
|
|
errout:
|
|
kfree(cstr.name);
|
|
f2fs_fname_crypto_free_buffer(&pstr);
|
|
kunmap(cpage);
|
|
page_cache_release(cpage);
|
|
return ERR_PTR(res);
|
|
}
|
|
|
|
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = f2fs_encrypted_follow_link,
|
|
.put_link = kfree_put_link,
|
|
.getattr = f2fs_getattr,
|
|
.setattr = f2fs_setattr,
|
|
.setxattr = generic_setxattr,
|
|
.getxattr = generic_getxattr,
|
|
.listxattr = f2fs_listxattr,
|
|
.removexattr = generic_removexattr,
|
|
};
|
|
#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,
|
|
.rename2 = 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
|
|
.setxattr = generic_setxattr,
|
|
.getxattr = generic_getxattr,
|
|
.listxattr = f2fs_listxattr,
|
|
.removexattr = generic_removexattr,
|
|
#endif
|
|
};
|
|
|
|
const struct inode_operations f2fs_symlink_inode_operations = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = f2fs_follow_link,
|
|
.put_link = page_put_link,
|
|
.getattr = f2fs_getattr,
|
|
.setattr = f2fs_setattr,
|
|
#ifdef CONFIG_F2FS_FS_XATTR
|
|
.setxattr = generic_setxattr,
|
|
.getxattr = generic_getxattr,
|
|
.listxattr = f2fs_listxattr,
|
|
.removexattr = generic_removexattr,
|
|
#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
|
|
.setxattr = generic_setxattr,
|
|
.getxattr = generic_getxattr,
|
|
.listxattr = f2fs_listxattr,
|
|
.removexattr = generic_removexattr,
|
|
#endif
|
|
};
|