namei.c 26.1 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"
21 22
#include "xattr.h"
#include "acl.h"
23
#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;
31
	int err;
32

33
	inode = new_inode(dir->i_sb);
34 35 36
	if (!inode)
		return ERR_PTR(-ENOMEM);

37
	f2fs_lock_op(sbi);
38
	if (!alloc_nid(sbi, &ino)) {
39
		f2fs_unlock_op(sbi);
40 41 42
		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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	set_inode_flag(inode, FI_NEW_INODE);

	if (test_opt(sbi, INLINE_XATTR))
		set_inode_flag(inode, FI_INLINE_XATTR);
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	if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
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		set_inode_flag(inode, FI_INLINE_DATA);
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	if (f2fs_may_inline_dentry(inode))
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		set_inode_flag(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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	return inode;

fail:
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	trace_f2fs_new_inode(inode, err);
83
	make_bad_inode(inode);
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	if (nid_free)
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		set_inode_flag(inode, FI_FREE_NID);
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	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;
104

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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);
147

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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);
172
	int err;
173

174
	if (f2fs_encrypted_inode(dir) &&
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			!fscrypt_has_permitted_context(dir, inode))
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		return -EPERM;

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	f2fs_balance_fs(sbi, true);
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180
	inode->i_ctime = CURRENT_TIME;
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	ihold(inode);
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	set_inode_flag(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:
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	clear_inode_flag(inode, FI_INC_LINK);
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	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(child->d_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:
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	if (!err)
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		clear_inode_flag(dir, FI_INLINE_DOTS);
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	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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	unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
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	if (f2fs_encrypted_inode(dir)) {
		int res = fscrypt_get_encryption_info(dir);

		/*
		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
		 * created while the directory was encrypted and we
		 * don't have access to the key.
		 */
		if (fscrypt_has_encryption_key(dir))
			fscrypt_set_encrypted_dentry(dentry);
		fscrypt_set_d_op(dentry);
		if (res && res != -ENOKEY)
			return ERR_PTR(res);
	}

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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 ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
		err = __recover_dot_dentries(dir, root_ino);
		if (err)
			goto err_out;
	}

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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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	}
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	if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
			(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
			!fscrypt_has_permitted_context(dir, inode)) {
		bool nokey = f2fs_encrypted_inode(inode) &&
			!fscrypt_has_encryption_key(inode);
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		err = nokey ? -ENOKEY : -EPERM;
		goto err_out;
314
	}
315
	return d_splice_alias(inode, dentry);
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err_out:
318
	iput(inode);
319
	return ERR_PTR(err);
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}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
324
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
325
	struct inode *inode = d_inode(dentry);
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	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

330
	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);
337

338
	f2fs_lock_op(sbi);
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	err = acquire_orphan_inode(sbi);
340
	if (err) {
341
		f2fs_unlock_op(sbi);
342
		f2fs_dentry_kunmap(dir, page);
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		f2fs_put_page(page, 0);
		goto fail;
	}
346
	f2fs_delete_entry(de, page, dir, inode);
347
	f2fs_unlock_op(sbi);
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	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
351
fail:
352
	trace_f2fs_unlink_exit(inode, err);
353 354 355
	return err;
}

356
static const char *f2fs_get_link(struct dentry *dentry,
357 358
				 struct inode *inode,
				 struct delayed_call *done)
359
{
360
	const char *link = page_get_link(dentry, inode, done);
361 362
	if (!IS_ERR(link) && !*link) {
		/* this is broken symlink case */
363 364
		do_delayed_call(done);
		clear_delayed_call(done);
365
		link = ERR_PTR(-ENOENT);
366
	}
367
	return link;
368 369
}

370 371 372
static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
373
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
374
	struct inode *inode;
375
	size_t len = strlen(symname);
376 377
	struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
	struct fscrypt_symlink_data *sd = NULL;
378
	int err;
379

380
	if (f2fs_encrypted_inode(dir)) {
381
		err = fscrypt_get_encryption_info(dir);
382 383 384
		if (err)
			return err;

385
		if (!fscrypt_has_encryption_key(dir))
386 387
			return -EPERM;

388 389
		disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
				sizeof(struct fscrypt_symlink_data));
390 391 392
	}

	if (disk_link.len > dir->i_sb->s_blocksize)
393 394
		return -ENAMETOOLONG;

395 396 397 398
	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

399 400 401 402
	if (f2fs_encrypted_inode(inode))
		inode->i_op = &f2fs_encrypted_symlink_inode_operations;
	else
		inode->i_op = &f2fs_symlink_inode_operations;
403
	inode_nohighmem(inode);
404 405
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

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	f2fs_balance_fs(sbi, true);
407

408
	f2fs_lock_op(sbi);
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	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
412
	f2fs_unlock_op(sbi);
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	alloc_nid_done(sbi, inode->i_ino);

415
	if (f2fs_encrypted_inode(inode)) {
416
		struct qstr istr = QSTR_INIT(symname, len);
417
		struct fscrypt_str ostr;
418

419 420 421
		sd = kzalloc(disk_link.len, GFP_NOFS);
		if (!sd) {
			err = -ENOMEM;
422
			goto err_out;
423
		}
424

425
		err = fscrypt_get_encryption_info(inode);
426 427 428
		if (err)
			goto err_out;

429
		if (!fscrypt_has_encryption_key(inode)) {
430
			err = -EPERM;
431 432 433
			goto err_out;
		}

434 435
		ostr.name = sd->encrypted_path;
		ostr.len = disk_link.len;
436
		err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
437
		if (err < 0)
438
			goto err_out;
439 440 441

		sd->len = cpu_to_le16(ostr.len);
		disk_link.name = (char *)sd;
442 443
	}

444
	err = page_symlink(inode, disk_link.name, disk_link.len);
445 446

err_out:
447 448
	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) {
460 461
		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);
	}
468 469

	kfree(sd);
470 471
	return err;
out:
472
	handle_failed_inode(inode);
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	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
478
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
479
	struct inode *inode;
480
	int err;
481 482 483

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
484
		return PTR_ERR(inode);
485 486 487 488

	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
489
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
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	f2fs_balance_fs(sbi, true);
492

493
	set_inode_flag(inode, FI_INC_LINK);
494
	f2fs_lock_op(sbi);
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	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out_fail;
498
	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:
510
	clear_inode_flag(inode, FI_INC_LINK);
511
	handle_failed_inode(inode);
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	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
517
	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)
{
526
	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);
538

539
	f2fs_lock_op(sbi);
540 541 542
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
543
	f2fs_unlock_op(sbi);
544 545

	alloc_nid_done(sbi, inode->i_ino);
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547 548
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
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	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
552 553
	return 0;
out:
554
	handle_failed_inode(inode);
555 556 557
	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);
	alloc_nid_done(sbi, inode->i_ino);

	if (whiteout) {
597
		f2fs_i_links_write(inode, false);
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		*whiteout = inode;
	} else {
		d_tmpfile(dentry, inode);
	}
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	/* link_count was changed by d_tmpfile as well. */
	f2fs_unlock_op(sbi);
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604 605 606 607 608 609 610 611 612 613 614 615
	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)
{
616
	if (f2fs_encrypted_inode(dir)) {
617
		int err = fscrypt_get_encryption_info(dir);
618 619 620 621
		if (err)
			return err;
	}

C
Chao Yu 已提交
622 623 624 625 626 627 628 629
	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);
}

630
static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
C
Chao Yu 已提交
631 632
			struct inode *new_dir, struct dentry *new_dentry,
			unsigned int flags)
633
{
634
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
635 636
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
C
Chao Yu 已提交
637
	struct inode *whiteout = NULL;
638
	struct page *old_dir_page;
C
Chao Yu 已提交
639
	struct page *old_page, *new_page = NULL;
640 641 642
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
643
	bool is_old_inline = f2fs_has_inline_dentry(old_dir);
644
	int err = -ENOENT;
645

646
	if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
647
			!fscrypt_has_permitted_context(new_dir, old_inode)) {
648 649 650 651
		err = -EPERM;
		goto out;
	}

652 653 654 655 656 657 658 659 660 661 662
	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
663 664 665 666 667 668
	if (flags & RENAME_WHITEOUT) {
		err = f2fs_create_whiteout(old_dir, &whiteout);
		if (err)
			goto out_dir;
	}

669 670 671 672
	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
C
Chao Yu 已提交
673
			goto out_whiteout;
674 675 676 677 678

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry)
C
Chao Yu 已提交
679
			goto out_whiteout;
680

J
Jaegeuk Kim 已提交
681
		f2fs_balance_fs(sbi, true);
682

683 684
		f2fs_lock_op(sbi);

J
Jaegeuk Kim 已提交
685 686 687 688
		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

689 690 691
		err = update_dent_inode(old_inode, new_inode,
						&new_dentry->d_name);
		if (err) {
J
Jaegeuk Kim 已提交
692 693
			release_orphan_inode(sbi);
			goto put_out_dir;
694 695
		}

696 697 698
		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
699
		down_write(&F2FS_I(new_inode)->i_sem);
700
		if (old_dir_entry)
701 702
			f2fs_i_links_write(new_inode, false);
		f2fs_i_links_write(new_inode, false);
703 704
		up_write(&F2FS_I(new_inode)->i_sem);

705 706
		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
J
Jaegeuk Kim 已提交
707 708 709
		else
			release_orphan_inode(sbi);

710
		update_inode_page(old_inode);
711
		update_inode_page(new_inode);
712
	} else {
J
Jaegeuk Kim 已提交
713
		f2fs_balance_fs(sbi, true);
714

715 716
		f2fs_lock_op(sbi);

717
		err = f2fs_add_link(new_dentry, old_inode);
718 719
		if (err) {
			f2fs_unlock_op(sbi);
C
Chao Yu 已提交
720
			goto out_whiteout;
721
		}
722 723

		if (old_dir_entry) {
724
			f2fs_i_links_write(new_dir, true);
725
			update_inode_page(new_dir);
726
		}
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746

		/*
		 * 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;
			}
		}
747 748
	}

749 750
	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
751 752
	if (new_inode && file_enc_name(new_inode))
		file_set_enc_name(old_inode);
753 754
	up_write(&F2FS_I(old_inode)->i_sem);

755
	old_inode->i_ctime = CURRENT_TIME;
756
	mark_inode_dirty_sync(old_inode);
757

758
	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
759

C
Chao Yu 已提交
760 761
	if (whiteout) {
		whiteout->i_state |= I_LINKABLE;
762
		set_inode_flag(whiteout, FI_INC_LINK);
C
Chao Yu 已提交
763 764 765 766 767 768 769
		err = f2fs_add_link(old_dentry, whiteout);
		if (err)
			goto put_out_dir;
		whiteout->i_state &= ~I_LINKABLE;
		iput(whiteout);
	}

770
	if (old_dir_entry) {
C
Chao Yu 已提交
771
		if (old_dir != new_dir && !whiteout) {
772 773
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
774
			update_inode_page(old_inode);
775
		} else {
776
			f2fs_dentry_kunmap(old_inode, old_dir_page);
777 778
			f2fs_put_page(old_dir_page, 0);
		}
779
		f2fs_i_links_write(old_dir, false);
780
		update_inode_page(old_dir);
781 782
	}

783
	f2fs_unlock_op(sbi);
J
Jaegeuk Kim 已提交
784 785 786

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
787 788
	return 0;

J
Jaegeuk Kim 已提交
789
put_out_dir:
790
	f2fs_unlock_op(sbi);
C
Chao Yu 已提交
791 792 793 794 795 796 797
	if (new_page) {
		f2fs_dentry_kunmap(new_dir, new_page);
		f2fs_put_page(new_page, 0);
	}
out_whiteout:
	if (whiteout)
		iput(whiteout);
798 799
out_dir:
	if (old_dir_entry) {
800
		f2fs_dentry_kunmap(old_inode, old_dir_page);
801 802 803
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
804
	f2fs_dentry_kunmap(old_dir, old_page);
805 806 807 808 809
	f2fs_put_page(old_page, 0);
out:
	return err;
}

C
Chao Yu 已提交
810 811 812
static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
			     struct inode *new_dir, struct dentry *new_dentry)
{
813
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
814 815
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
C
Chao Yu 已提交
816 817 818 819 820 821 822
	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;

823
	if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
824 825 826
			(old_dir != new_dir) &&
			(!fscrypt_has_permitted_context(new_dir, old_inode) ||
			 !fscrypt_has_permitted_context(old_dir, new_inode)))
827 828
		return -EPERM;

C
Chao Yu 已提交
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
	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
871
	f2fs_balance_fs(sbi, true);
872

C
Chao Yu 已提交
873 874
	f2fs_lock_op(sbi);

875
	err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
C
Chao Yu 已提交
876 877
	if (err)
		goto out_unlock;
878 879
	if (file_enc_name(new_inode))
		file_set_enc_name(old_inode);
C
Chao Yu 已提交
880

881
	err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
C
Chao Yu 已提交
882 883
	if (err)
		goto out_undo;
884 885
	if (file_enc_name(old_inode))
		file_set_enc_name(new_inode);
C
Chao Yu 已提交
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906

	/* 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);
907
		f2fs_i_links_write(old_dir, old_nlink > 0);
C
Chao Yu 已提交
908 909
		up_write(&F2FS_I(old_dir)->i_sem);
	}
910
	mark_inode_dirty_sync(old_dir);
C
Chao Yu 已提交
911 912 913 914 915 916 917 918 919 920 921 922 923 924
	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);
925
		f2fs_i_links_write(new_dir, new_nlink > 0);
C
Chao Yu 已提交
926 927
		up_write(&F2FS_I(new_dir)->i_sem);
	}
928
	mark_inode_dirty_sync(new_dir);
C
Chao Yu 已提交
929 930 931
	update_inode_page(new_dir);

	f2fs_unlock_op(sbi);
J
Jaegeuk Kim 已提交
932 933 934

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
C
Chao Yu 已提交
935 936
	return 0;
out_undo:
937 938 939 940 941
	/*
	 * 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
942 943 944 945
out_unlock:
	f2fs_unlock_op(sbi);
out_new_dir:
	if (new_dir_entry) {
946
		f2fs_dentry_kunmap(new_inode, new_dir_page);
C
Chao Yu 已提交
947 948 949 950
		f2fs_put_page(new_dir_page, 0);
	}
out_old_dir:
	if (old_dir_entry) {
951
		f2fs_dentry_kunmap(old_inode, old_dir_page);
C
Chao Yu 已提交
952 953 954
		f2fs_put_page(old_dir_page, 0);
	}
out_new:
955
	f2fs_dentry_kunmap(new_dir, new_page);
C
Chao Yu 已提交
956 957
	f2fs_put_page(new_page, 0);
out_old:
958
	f2fs_dentry_kunmap(old_dir, old_page);
C
Chao Yu 已提交
959 960 961 962 963 964 965 966 967
	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
968
	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
C
Chao Yu 已提交
969 970 971 972 973 974 975 976 977 978
		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
979
	return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
C
Chao Yu 已提交
980 981
}

982
static const char *f2fs_encrypted_get_link(struct dentry *dentry,
983 984
					   struct inode *inode,
					   struct delayed_call *done)
C
Chao Yu 已提交
985
{
986 987
	struct page *cpage = NULL;
	char *caddr, *paddr = NULL;
988 989 990
	struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
	struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
	struct fscrypt_symlink_data *sd;
991 992 993 994
	loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
	u32 max_size = inode->i_sb->s_blocksize;
	int res;

995 996 997
	if (!dentry)
		return ERR_PTR(-ECHILD);

998
	res = fscrypt_get_encryption_info(inode);
999 1000 1001 1002 1003
	if (res)
		return ERR_PTR(res);

	cpage = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(cpage))
1004
		return ERR_CAST(cpage);
1005
	caddr = page_address(cpage);
1006 1007 1008
	caddr[size] = 0;

	/* Symlink is encrypted */
1009
	sd = (struct fscrypt_symlink_data *)caddr;
1010
	cstr.name = sd->encrypted_path;
1011
	cstr.len = le16_to_cpu(sd->len);
1012 1013 1014 1015 1016 1017

	/* this is broken symlink case */
	if (unlikely(cstr.len == 0)) {
		res = -ENOENT;
		goto errout;
	}
1018

1019
	if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1020 1021 1022 1023
		/* Symlink data on the disk is corrupted */
		res = -EIO;
		goto errout;
	}
1024
	res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1025 1026 1027
	if (res)
		goto errout;

1028
	res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1029 1030 1031
	if (res < 0)
		goto errout;

1032 1033 1034 1035 1036 1037
	/* this is broken symlink case */
	if (unlikely(pstr.name[0] == 0)) {
		res = -ENOENT;
		goto errout;
	}

1038 1039 1040 1041 1042
	paddr = pstr.name;

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

1043
	put_page(cpage);
1044 1045
	set_delayed_call(done, kfree_link, paddr);
	return paddr;
1046
errout:
1047
	fscrypt_fname_free_buffer(&pstr);
1048
	put_page(cpage);
1049
	return ERR_PTR(res);
C
Chao Yu 已提交
1050 1051
}

1052 1053
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
	.readlink       = generic_readlink,
1054
	.get_link       = f2fs_encrypted_get_link,
1055 1056
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
1057
#ifdef CONFIG_F2FS_FS_XATTR
1058 1059 1060 1061
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
1062
#endif
1063 1064
};

1065 1066 1067 1068 1069 1070 1071 1072 1073
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
1074
	.rename2	= f2fs_rename2,
C
Chao Yu 已提交
1075
	.tmpfile	= f2fs_tmpfile,
1076
	.getattr	= f2fs_getattr,
1077 1078
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
1079
	.set_acl	= f2fs_set_acl,
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
#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,
1090
	.get_link       = f2fs_get_link,
1091
	.getattr	= f2fs_getattr,
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101
	.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 = {
1102
	.getattr	= f2fs_getattr,
1103 1104
	.setattr        = f2fs_setattr,
	.get_acl	= f2fs_get_acl,
1105
	.set_acl	= f2fs_set_acl,
1106 1107 1108 1109 1110 1111 1112
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr       = generic_setxattr,
	.getxattr       = generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr    = generic_removexattr,
#endif
};