namei.c 24.4 KB
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/*
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 * 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>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include "f2fs.h"
20
#include "node.h"
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#include "xattr.h"
#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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	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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	nid_t ino;
	struct inode *inode;
	bool nid_free = false;
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	int err;
32

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	inode = new_inode(dir->i_sb);
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	if (!inode)
		return ERR_PTR(-ENOMEM);

37
	f2fs_lock_op(sbi);
38
	if (!alloc_nid(sbi, &ino)) {
39
		f2fs_unlock_op(sbi);
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		err = -ENOSPC;
		goto fail;
	}
43
	f2fs_unlock_op(sbi);
44

45
	inode_init_owner(inode, dir, mode);
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	inode->i_ino = ino;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	inode->i_generation = sbi->s_next_generation++;

	err = insert_inode_locked(inode);
	if (err) {
		err = -EINVAL;
		nid_free = true;
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		goto fail;
57
	}
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	/* If the directory encrypted, then we should encrypt the inode. */
	if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
		f2fs_set_encrypted_inode(inode);

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	if (test_opt(sbi, INLINE_DATA) && 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);
	stat_inc_inline_dir(inode);

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	trace_f2fs_new_inode(inode, 0);
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	mark_inode_dirty(inode);
	return inode;

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);
	iput(inode);
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	return ERR_PTR(err);
}

static int is_multimedia_file(const unsigned char *s, const char *sub)
{
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	size_t slen = strlen(s);
	size_t sublen = strlen(sub);
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	/*
	 * filename format of multimedia file should be defined as:
	 * "filename + '.' + extension".
	 */
	if (slen < sublen + 2)
		return 0;

	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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static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
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		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++) {
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		if (is_multimedia_file(name, extlist[i])) {
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			file_set_cold(inode);
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			break;
		}
	}
}

static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
						bool excl)
{
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	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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	struct inode *inode;
	nid_t ino = 0;
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	int err;
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	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	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;
	inode->i_fop = &f2fs_file_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	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);
	if (err)
		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))
		f2fs_sync_fs(sbi->sb, 1);
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	return 0;
out:
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	handle_failed_inode(inode);
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	return err;
}

static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
		struct dentry *dentry)
{
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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) &&
		!f2fs_is_child_context_consistent_with_parent(dir, inode))
		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);
	if (err)
		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))
		f2fs_sync_fs(sbi->sb, 1);
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	return 0;
out:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	iput(inode);
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	f2fs_unlock_op(sbi);
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	return err;
}

struct dentry *f2fs_get_parent(struct dentry *child)
{
	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)
		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)
{
	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;

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	f2fs_balance_fs(sbi);

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	f2fs_lock_op(sbi);

	de = f2fs_find_entry(dir, &dot, &page);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} 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 {
		err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
	}
out:
	if (!err) {
		clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
		mark_inode_dirty(dir);
	}

	f2fs_unlock_op(sbi);
	return err;
}

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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;
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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);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
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	if (!de)
		return d_splice_alias(inode, dentry);
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	ino = le32_to_cpu(de->ino);
	f2fs_dentry_kunmap(dir, page);
	f2fs_put_page(page, 0);
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	inode = f2fs_iget(dir->i_sb, ino);
	if (IS_ERR(inode))
		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)
			goto err_out;
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	}
	return d_splice_alias(inode, dentry);
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err_out:
	iget_failed(inode);
	return ERR_PTR(err);
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}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
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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;
	struct page *page;
	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);
	if (!de)
		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);
		goto fail;
	}
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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))
		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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static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
322
{
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	const char *link = page_follow_link_light(dentry, cookie);
324 325
	if (!IS_ERR(link) && !*link) {
		/* 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,
					const char *symname)
{
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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);
	size_t p_len;
	char *p_str;
	struct f2fs_str disk_link = FSTR_INIT(NULL, 0);
	struct f2fs_encrypted_symlink_data *sd = NULL;
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	int err;
343

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	if (len > dir->i_sb->s_blocksize)
		return -ENAMETOOLONG;

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	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

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	if (f2fs_encrypted_inode(inode))
		inode->i_op = &f2fs_encrypted_symlink_inode_operations;
	else
		inode->i_op = &f2fs_symlink_inode_operations;
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	inode->i_mapping->a_ops = &f2fs_dblock_aops;

357 358
	f2fs_balance_fs(sbi);

359
	f2fs_lock_op(sbi);
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	err = f2fs_add_link(dentry, inode);
	if (err)
		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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	if (f2fs_encrypted_inode(dir)) {
		struct qstr istr = QSTR_INIT(symname, len);

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		err = f2fs_get_encryption_info(inode);
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		if (err)
			goto err_out;

		err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link);
		if (err)
			goto err_out;

		err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link);
		if (err < 0)
			goto err_out;

		p_len = encrypted_symlink_data_len(disk_link.len) + 1;

		if (p_len > dir->i_sb->s_blocksize) {
			err = -ENAMETOOLONG;
			goto err_out;
		}

		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);
		p_str = (char *)sd;
	} else {
		p_len = len + 1;
		p_str = (char *)symname;
	}

	err = page_symlink(inode, p_str, p_len);

err_out:
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	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
	 * 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.
	 */
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	if (!err) {
417
		filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1);
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		if (IS_DIRSYNC(dir))
			f2fs_sync_fs(sbi->sb, 1);
	} else {
		f2fs_unlink(dir, dentry);
	}
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	kfree(sd);
	f2fs_fname_crypto_free_buffer(&disk_link);
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	return err;
out:
429
	handle_failed_inode(inode);
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	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
435
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
436
	struct inode *inode;
437
	int err;
438 439 440

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
441
		return PTR_ERR(inode);
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	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
446
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
447

448 449
	f2fs_balance_fs(sbi);

450
	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
451
	f2fs_lock_op(sbi);
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	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out_fail;
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	f2fs_unlock_op(sbi);
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	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

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	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
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	return 0;

out_fail:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
468
	handle_failed_inode(inode);
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	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
474
	struct inode *inode = d_inode(dentry);
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	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)
{
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	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
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	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;

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	f2fs_balance_fs(sbi);

496
	f2fs_lock_op(sbi);
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	err = f2fs_add_link(dentry, inode);
	if (err)
		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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	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
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	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
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	return 0;
out:
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	handle_failed_inode(inode);
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	return err;
}

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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;
	}

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	f2fs_balance_fs(sbi);

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	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)
{
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	if (f2fs_encrypted_inode(dir)) {
		int err = f2fs_get_encryption_info(dir);
		if (err)
			return err;
	}

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	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);
}

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static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
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			struct inode *new_dir, struct dentry *new_dentry,
			unsigned int flags)
590
{
591
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
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	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
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	struct inode *whiteout = NULL;
595
	struct page *old_dir_page;
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	struct page *old_page, *new_page = NULL;
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	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
600
	int err = -ENOENT;
601

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	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;
	}

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	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;
	}

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620 621 622 623 624 625
	if (flags & RENAME_WHITEOUT) {
		err = f2fs_create_whiteout(old_dir, &whiteout);
		if (err)
			goto out_dir;
	}

626 627 628 629
	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
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Chao Yu 已提交
630
			goto out_whiteout;
631 632 633 634 635

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry)
C
Chao Yu 已提交
636
			goto out_whiteout;
637

638 639
		f2fs_balance_fs(sbi);

640 641
		f2fs_lock_op(sbi);

J
Jaegeuk Kim 已提交
642 643 644 645
		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

646 647
		if (update_dent_inode(old_inode, new_inode,
						&new_dentry->d_name)) {
J
Jaegeuk Kim 已提交
648 649
			release_orphan_inode(sbi);
			goto put_out_dir;
650 651
		}

652 653 654
		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
655
		down_write(&F2FS_I(new_inode)->i_sem);
656 657 658
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
659 660
		up_write(&F2FS_I(new_inode)->i_sem);

661
		mark_inode_dirty(new_inode);
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Jaegeuk Kim 已提交
662

663 664
		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
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Jaegeuk Kim 已提交
665 666 667
		else
			release_orphan_inode(sbi);

668
		update_inode_page(old_inode);
669
		update_inode_page(new_inode);
670
	} else {
671 672
		f2fs_balance_fs(sbi);

673 674
		f2fs_lock_op(sbi);

675
		err = f2fs_add_link(new_dentry, old_inode);
676 677
		if (err) {
			f2fs_unlock_op(sbi);
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Chao Yu 已提交
678
			goto out_whiteout;
679
		}
680 681 682

		if (old_dir_entry) {
			inc_nlink(new_dir);
683
			update_inode_page(new_dir);
684 685 686
		}
	}

687 688
	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
689 690
	if (new_inode && file_enc_name(new_inode))
		file_set_enc_name(old_inode);
691 692
	up_write(&F2FS_I(old_inode)->i_sem);

693 694 695
	old_inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(old_inode);

696
	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
697

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698 699 700 701 702 703 704 705 706 707
	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);
	}

708
	if (old_dir_entry) {
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Chao Yu 已提交
709
		if (old_dir != new_dir && !whiteout) {
710 711
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
712
			update_inode_page(old_inode);
713
		} else {
714
			f2fs_dentry_kunmap(old_inode, old_dir_page);
715 716 717
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
718
		mark_inode_dirty(old_dir);
719
		update_inode_page(old_dir);
720 721
	}

722
	f2fs_unlock_op(sbi);
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Jaegeuk Kim 已提交
723 724 725

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
726 727
	return 0;

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728
put_out_dir:
729
	f2fs_unlock_op(sbi);
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730 731 732 733 734 735 736
	if (new_page) {
		f2fs_dentry_kunmap(new_dir, new_page);
		f2fs_put_page(new_page, 0);
	}
out_whiteout:
	if (whiteout)
		iput(whiteout);
737 738
out_dir:
	if (old_dir_entry) {
739
		f2fs_dentry_kunmap(old_inode, old_dir_page);
740 741 742
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
743
	f2fs_dentry_kunmap(old_dir, old_page);
744 745 746 747 748
	f2fs_put_page(old_page, 0);
out:
	return err;
}

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static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
			     struct inode *new_dir, struct dentry *new_dentry)
{
752
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
753 754
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
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	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;

762 763 764 765 766 767 768 769
	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;

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770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811
	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;
	}

812 813
	f2fs_balance_fs(sbi);

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814 815
	f2fs_lock_op(sbi);

816
	err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
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Chao Yu 已提交
817 818
	if (err)
		goto out_unlock;
819 820
	if (file_enc_name(new_inode))
		file_set_enc_name(old_inode);
C
Chao Yu 已提交
821

822
	err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
C
Chao Yu 已提交
823 824
	if (err)
		goto out_undo;
825 826
	if (file_enc_name(old_inode))
		file_set_enc_name(new_inode);
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Chao Yu 已提交
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878

	/* 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);
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879 880 881

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
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Chao Yu 已提交
882 883
	return 0;
out_undo:
884 885 886 887 888
	/*
	 * 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);
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889 890 891 892
out_unlock:
	f2fs_unlock_op(sbi);
out_new_dir:
	if (new_dir_entry) {
893
		f2fs_dentry_kunmap(new_inode, new_dir_page);
C
Chao Yu 已提交
894 895 896 897
		f2fs_put_page(new_dir_page, 0);
	}
out_old_dir:
	if (old_dir_entry) {
898
		f2fs_dentry_kunmap(old_inode, old_dir_page);
C
Chao Yu 已提交
899 900 901
		f2fs_put_page(old_dir_page, 0);
	}
out_new:
902
	f2fs_dentry_kunmap(new_dir, new_page);
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Chao Yu 已提交
903 904
	f2fs_put_page(new_page, 0);
out_old:
905
	f2fs_dentry_kunmap(old_dir, old_page);
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Chao Yu 已提交
906 907 908 909 910 911 912 913 914
	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)
{
C
Chao Yu 已提交
915
	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
C
Chao Yu 已提交
916 917 918 919 920 921 922 923 924 925
		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.
	 */
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Chao Yu 已提交
926
	return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
C
Chao Yu 已提交
927 928
}

929
#ifdef CONFIG_F2FS_FS_ENCRYPTION
930
static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
C
Chao Yu 已提交
931
{
932 933 934 935 936 937 938 939 940 941
	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;

942
	res = f2fs_get_encryption_info(inode);
943 944 945 946 947
	if (res)
		return ERR_PTR(res);

	cpage = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(cpage))
948
		return ERR_CAST(cpage);
949 950 951 952 953 954
	caddr = kmap(cpage);
	caddr[size] = 0;

	/* Symlink is encrypted */
	sd = (struct f2fs_encrypted_symlink_data *)caddr;
	cstr.len = le16_to_cpu(sd->len);
955 956 957 958 959 960
	cstr.name = kmalloc(cstr.len, GFP_NOFS);
	if (!cstr.name) {
		res = -ENOMEM;
		goto errout;
	}
	memcpy(cstr.name, sd->encrypted_path, cstr.len);
961 962 963 964 965 966

	/* this is broken symlink case */
	if (cstr.name[0] == 0 && cstr.len == 0) {
		res = -ENOENT;
		goto errout;
	}
967

968 969 970 971 972 973 974 975 976 977 978 979 980 981
	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;

982 983
	kfree(cstr.name);

984 985 986 987 988 989 990
	paddr = pstr.name;

	/* Null-terminate the name */
	paddr[res] = '\0';

	kunmap(cpage);
	page_cache_release(cpage);
991
	return *cookie = paddr;
992
errout:
993
	kfree(cstr.name);
994 995 996 997
	f2fs_fname_crypto_free_buffer(&pstr);
	kunmap(cpage);
	page_cache_release(cpage);
	return ERR_PTR(res);
C
Chao Yu 已提交
998 999
}

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
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

1013 1014 1015 1016 1017 1018 1019 1020 1021
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,
C
Chao Yu 已提交
1022
	.rename2	= f2fs_rename2,
C
Chao Yu 已提交
1023
	.tmpfile	= f2fs_tmpfile,
1024
	.getattr	= f2fs_getattr,
1025 1026
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
1027
	.set_acl	= f2fs_set_acl,
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
#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,
1038
	.follow_link    = f2fs_follow_link,
1039
	.put_link       = page_put_link,
1040
	.getattr	= f2fs_getattr,
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
	.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 = {
1051
	.getattr	= f2fs_getattr,
1052 1053
	.setattr        = f2fs_setattr,
	.get_acl	= f2fs_get_acl,
1054
	.set_acl	= f2fs_set_acl,
1055 1056 1057 1058 1059 1060 1061
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr       = generic_setxattr,
	.getxattr       = generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr    = generic_removexattr,
#endif
};