namei.c 25.4 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

33
	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, true);
144

145
	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);
169
	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, true);
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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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	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;
	}

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	f2fs_balance_fs(sbi, true);
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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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264
	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, true);
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307
	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);
316
	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:
324
	trace_f2fs_unlink_exit(inode, err);
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	return err;
}

328
static const char *f2fs_get_link(struct dentry *dentry,
329 330
				 struct inode *inode,
				 struct delayed_call *done)
331
{
332
	const char *link = page_get_link(dentry, inode, done);
333 334
	if (!IS_ERR(link) && !*link) {
		/* this is broken symlink case */
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		do_delayed_call(done);
		clear_delayed_call(done);
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		link = ERR_PTR(-ENOENT);
338
	}
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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)
{
345
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
346
	struct inode *inode;
347
	size_t len = strlen(symname);
348
	struct f2fs_str disk_link = FSTR_INIT((char *)symname, len + 1);
349
	struct f2fs_encrypted_symlink_data *sd = NULL;
350
	int err;
351

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

		if (!f2fs_encrypted_inode(dir))
			return -EPERM;

		disk_link.len = (f2fs_fname_encrypted_size(dir, len) +
				sizeof(struct f2fs_encrypted_symlink_data));
	}

	if (disk_link.len > dir->i_sb->s_blocksize)
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		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_nohighmem(inode);
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	inode->i_mapping->a_ops = &f2fs_dblock_aops;

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	f2fs_balance_fs(sbi, true);
379

380
	f2fs_lock_op(sbi);
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	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
384
	f2fs_unlock_op(sbi);
385 386
	alloc_nid_done(sbi, inode->i_ino);

387
	if (f2fs_encrypted_inode(inode)) {
388
		struct qstr istr = QSTR_INIT(symname, len);
389
		struct f2fs_str ostr;
390

391 392 393
		sd = kzalloc(disk_link.len, GFP_NOFS);
		if (!sd) {
			err = -ENOMEM;
394
			goto err_out;
395
		}
396

397
		err = f2fs_get_encryption_info(inode);
398 399 400
		if (err)
			goto err_out;

401 402
		if (!f2fs_encrypted_inode(inode)) {
			err = -EPERM;
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			goto err_out;
		}

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		ostr.name = sd->encrypted_path;
		ostr.len = disk_link.len;
		err = f2fs_fname_usr_to_disk(inode, &istr, &ostr);
		if (err < 0)
410
			goto err_out;
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		sd->len = cpu_to_le16(ostr.len);
		disk_link.name = (char *)sd;
414 415
	}

416
	err = page_symlink(inode, disk_link.name, disk_link.len);
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err_out:
419 420
	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) {
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		filemap_write_and_wait_range(inode->i_mapping, 0,
							disk_link.len - 1);
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		if (IS_DIRSYNC(dir))
			f2fs_sync_fs(sbi->sb, 1);
	} else {
		f2fs_unlink(dir, dentry);
	}
440 441

	kfree(sd);
442 443
	return err;
out:
444
	handle_failed_inode(inode);
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	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
450
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
451
	struct inode *inode;
452
	int err;
453 454 455

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
456
		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;
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	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
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	f2fs_balance_fs(sbi, true);
464

465
	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
466
	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);
483
	handle_failed_inode(inode);
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	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
489
	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)
{
498
	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, true);
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511
	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:
526
	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, true);
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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)
605
{
606
	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;
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	struct page *old_dir_page;
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611
	struct page *old_page, *new_page = NULL;
612 613 614
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
615
	bool is_old_inline = f2fs_has_inline_dentry(old_dir);
616
	int err = -ENOENT;
617

618 619 620 621 622 623 624
	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;
	}

625 626 627 628 629 630 631 632 633 634 635
	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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Chao Yu 已提交
636 637 638 639 640 641
	if (flags & RENAME_WHITEOUT) {
		err = f2fs_create_whiteout(old_dir, &whiteout);
		if (err)
			goto out_dir;
	}

642 643 644 645
	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
C
Chao Yu 已提交
646
			goto out_whiteout;
647 648 649 650 651

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry)
C
Chao Yu 已提交
652
			goto out_whiteout;
653

J
Jaegeuk Kim 已提交
654
		f2fs_balance_fs(sbi, true);
655

656 657
		f2fs_lock_op(sbi);

J
Jaegeuk Kim 已提交
658 659 660 661
		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

662 663 664
		err = update_dent_inode(old_inode, new_inode,
						&new_dentry->d_name);
		if (err) {
J
Jaegeuk Kim 已提交
665 666
			release_orphan_inode(sbi);
			goto put_out_dir;
667 668
		}

669 670 671
		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
672
		down_write(&F2FS_I(new_inode)->i_sem);
673 674 675
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
676 677
		up_write(&F2FS_I(new_inode)->i_sem);

678
		mark_inode_dirty(new_inode);
J
Jaegeuk Kim 已提交
679

680 681
		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
J
Jaegeuk Kim 已提交
682 683 684
		else
			release_orphan_inode(sbi);

685
		update_inode_page(old_inode);
686
		update_inode_page(new_inode);
687
	} else {
J
Jaegeuk Kim 已提交
688
		f2fs_balance_fs(sbi, true);
689

690 691
		f2fs_lock_op(sbi);

692
		err = f2fs_add_link(new_dentry, old_inode);
693 694
		if (err) {
			f2fs_unlock_op(sbi);
C
Chao Yu 已提交
695
			goto out_whiteout;
696
		}
697 698 699

		if (old_dir_entry) {
			inc_nlink(new_dir);
700
			update_inode_page(new_dir);
701
		}
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721

		/*
		 * 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 = -EIO;
				f2fs_unlock_op(sbi);
				goto out_whiteout;
			}
		}
722 723
	}

724 725
	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
726 727
	if (new_inode && file_enc_name(new_inode))
		file_set_enc_name(old_inode);
728 729
	up_write(&F2FS_I(old_inode)->i_sem);

730 731 732
	old_inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(old_inode);

733
	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
734

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Chao Yu 已提交
735 736 737 738 739 740 741 742 743 744
	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);
	}

745
	if (old_dir_entry) {
C
Chao Yu 已提交
746
		if (old_dir != new_dir && !whiteout) {
747 748
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
749
			update_inode_page(old_inode);
750
		} else {
751
			f2fs_dentry_kunmap(old_inode, old_dir_page);
752 753 754
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
755
		mark_inode_dirty(old_dir);
756
		update_inode_page(old_dir);
757 758
	}

759
	f2fs_unlock_op(sbi);
J
Jaegeuk Kim 已提交
760 761 762

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
763 764
	return 0;

J
Jaegeuk Kim 已提交
765
put_out_dir:
766
	f2fs_unlock_op(sbi);
C
Chao Yu 已提交
767 768 769 770 771 772 773
	if (new_page) {
		f2fs_dentry_kunmap(new_dir, new_page);
		f2fs_put_page(new_page, 0);
	}
out_whiteout:
	if (whiteout)
		iput(whiteout);
774 775
out_dir:
	if (old_dir_entry) {
776
		f2fs_dentry_kunmap(old_inode, old_dir_page);
777 778 779
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
780
	f2fs_dentry_kunmap(old_dir, old_page);
781 782 783 784 785
	f2fs_put_page(old_page, 0);
out:
	return err;
}

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Chao Yu 已提交
786 787 788
static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
			     struct inode *new_dir, struct dentry *new_dentry)
{
789
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
790 791
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
C
Chao Yu 已提交
792 793 794 795 796 797 798
	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;

799 800 801 802 803 804 805 806
	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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Chao Yu 已提交
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
	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;
	}

J
Jaegeuk Kim 已提交
849
	f2fs_balance_fs(sbi, true);
850

C
Chao Yu 已提交
851 852
	f2fs_lock_op(sbi);

853
	err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
C
Chao Yu 已提交
854 855
	if (err)
		goto out_unlock;
856 857
	if (file_enc_name(new_inode))
		file_set_enc_name(old_inode);
C
Chao Yu 已提交
858

859
	err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
C
Chao Yu 已提交
860 861
	if (err)
		goto out_undo;
862 863
	if (file_enc_name(old_inode))
		file_set_enc_name(new_inode);
C
Chao Yu 已提交
864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915

	/* 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);
J
Jaegeuk Kim 已提交
916 917 918

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
C
Chao Yu 已提交
919 920
	return 0;
out_undo:
921 922 923 924 925
	/*
	 * 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);
C
Chao Yu 已提交
926 927 928 929
out_unlock:
	f2fs_unlock_op(sbi);
out_new_dir:
	if (new_dir_entry) {
930
		f2fs_dentry_kunmap(new_inode, new_dir_page);
C
Chao Yu 已提交
931 932 933 934
		f2fs_put_page(new_dir_page, 0);
	}
out_old_dir:
	if (old_dir_entry) {
935
		f2fs_dentry_kunmap(old_inode, old_dir_page);
C
Chao Yu 已提交
936 937 938
		f2fs_put_page(old_dir_page, 0);
	}
out_new:
939
	f2fs_dentry_kunmap(new_dir, new_page);
C
Chao Yu 已提交
940 941
	f2fs_put_page(new_page, 0);
out_old:
942
	f2fs_dentry_kunmap(old_dir, old_page);
C
Chao Yu 已提交
943 944 945 946 947 948 949 950 951
	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
952
	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
C
Chao Yu 已提交
953 954 955 956 957 958 959 960 961 962
		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.
	 */
C
Chao Yu 已提交
963
	return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
C
Chao Yu 已提交
964 965
}

966
#ifdef CONFIG_F2FS_FS_ENCRYPTION
967
static const char *f2fs_encrypted_get_link(struct dentry *dentry,
968 969
					   struct inode *inode,
					   struct delayed_call *done)
C
Chao Yu 已提交
970
{
971 972
	struct page *cpage = NULL;
	char *caddr, *paddr = NULL;
973
	struct f2fs_str cstr = FSTR_INIT(NULL, 0);
974 975 976 977 978 979
	struct f2fs_str pstr = FSTR_INIT(NULL, 0);
	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;

980 981 982
	if (!dentry)
		return ERR_PTR(-ECHILD);

983
	res = f2fs_get_encryption_info(inode);
984 985 986 987 988
	if (res)
		return ERR_PTR(res);

	cpage = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(cpage))
989
		return ERR_CAST(cpage);
990
	caddr = page_address(cpage);
991 992 993 994
	caddr[size] = 0;

	/* Symlink is encrypted */
	sd = (struct f2fs_encrypted_symlink_data *)caddr;
995
	cstr.name = sd->encrypted_path;
996
	cstr.len = le16_to_cpu(sd->len);
997 998 999 1000 1001 1002

	/* this is broken symlink case */
	if (unlikely(cstr.len == 0)) {
		res = -ENOENT;
		goto errout;
	}
1003 1004

	/* this is broken symlink case */
1005
	if (unlikely(cstr.name[0] == 0)) {
1006 1007 1008
		res = -ENOENT;
		goto errout;
	}
1009

1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
	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;

	paddr = pstr.name;

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

	page_cache_release(cpage);
1030 1031
	set_delayed_call(done, kfree_link, paddr);
	return paddr;
1032 1033 1034 1035
errout:
	f2fs_fname_crypto_free_buffer(&pstr);
	page_cache_release(cpage);
	return ERR_PTR(res);
C
Chao Yu 已提交
1036 1037
}

1038 1039
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
	.readlink       = generic_readlink,
1040
	.get_link       = f2fs_encrypted_get_link,
1041 1042
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
1043
#ifdef CONFIG_F2FS_FS_XATTR
1044 1045 1046 1047
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
1048
#endif
1049 1050 1051
};
#endif

1052 1053 1054 1055 1056 1057 1058 1059 1060
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
1061
	.rename2	= f2fs_rename2,
C
Chao Yu 已提交
1062
	.tmpfile	= f2fs_tmpfile,
1063
	.getattr	= f2fs_getattr,
1064 1065
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
1066
	.set_acl	= f2fs_set_acl,
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
#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,
1077
	.get_link       = f2fs_get_link,
1078
	.getattr	= f2fs_getattr,
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	.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 = {
1089
	.getattr	= f2fs_getattr,
1090 1091
	.setattr        = f2fs_setattr,
	.get_acl	= f2fs_get_acl,
1092
	.set_acl	= f2fs_set_acl,
1093 1094 1095 1096 1097 1098 1099
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr       = generic_setxattr,
	.getxattr       = generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr    = generic_removexattr,
#endif
};