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Commit 57397d86 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: add inode operations for special inodes 



This adds inode operations for directory, symlink, and special inodes.

Signed-off-by: default avatarChangman Lee <cm224.lee@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 19f99cee

fs/f2fs/namei.c

0 → 100644
+504 −0
Original line number Diff line number Diff line 
/**

 * fs/f2fs/namei.c

 *

 * Copyright (c) 2012 Samsung Electronics Co., Ltd.

 *             http://www.samsung.com/

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/fs.h>

#include <linux/f2fs_fs.h>

#include <linux/pagemap.h>

#include <linux/sched.h>

#include <linux/ctype.h>



#include "f2fs.h"

#include "xattr.h"

#include "acl.h"



static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)

{

	struct super_block *sb = dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	nid_t ino;

	struct inode *inode;

	bool nid_free = false;

	int err;



	inode = new_inode(sb);

	if (!inode)

		return ERR_PTR(-ENOMEM);



	mutex_lock_op(sbi, NODE_NEW);

	if (!alloc_nid(sbi, &ino)) {

		mutex_unlock_op(sbi, NODE_NEW);

		err = -ENOSPC;

		goto fail;

	}

	mutex_unlock_op(sbi, NODE_NEW);



	inode->i_uid = current_fsuid();



	if (dir->i_mode & S_ISGID) {

		inode->i_gid = dir->i_gid;

		if (S_ISDIR(mode))

			mode |= S_ISGID;

	} else {

		inode->i_gid = current_fsgid();

	}



	inode->i_ino = ino;

	inode->i_mode = mode;

	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;

		goto out;

	}



	mark_inode_dirty(inode);

	return inode;



out:

	clear_nlink(inode);

	unlock_new_inode(inode);

fail:

	iput(inode);

	if (nid_free)

		alloc_nid_failed(sbi, ino);

	return ERR_PTR(err);

}



static int is_multimedia_file(const unsigned char *s, const char *sub)

{

	int slen = strlen(s);

	int sublen = strlen(sub);

	int ret;



	if (sublen > slen)

		return 1;



	ret = memcmp(s + slen - sublen, sub, sublen);

	if (ret) {	/* compare upper case */

		int i;

		char upper_sub[8];

		for (i = 0; i < sublen && i < sizeof(upper_sub); i++)

			upper_sub[i] = toupper(sub[i]);

		return memcmp(s + slen - sublen, upper_sub, sublen);

	}



	return ret;

}



/**

 * Set multimedia files as cold files for hot/cold data separation

 */

static inline void set_cold_file(struct f2fs_sb_info *sbi, struct inode *inode,

		const unsigned char *name)

{

	int i;

	__u8 (*extlist)[8] = sbi->raw_super->extension_list;



	int count = le32_to_cpu(sbi->raw_super->extension_count);

	for (i = 0; i < count; i++) {

		if (!is_multimedia_file(name, extlist[i])) {

			F2FS_I(inode)->i_advise |= FADVISE_COLD_BIT;

			break;

		}

	}

}



static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,

						bool excl)

{

	struct super_block *sb = dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	struct inode *inode;

	nid_t ino = 0;

	int err;



	inode = f2fs_new_inode(dir, mode);

	if (IS_ERR(inode))

		return PTR_ERR(inode);



	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))

		set_cold_file(sbi, inode, dentry->d_name.name);



	inode->i_op = &f2fs_file_inode_operations;

	inode->i_fop = &f2fs_file_operations;

	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	ino = inode->i_ino;



	err = f2fs_add_link(dentry, inode);

	if (err)

		goto out;



	alloc_nid_done(sbi, ino);



	if (!sbi->por_doing)

		d_instantiate(dentry, inode);

	unlock_new_inode(inode);



	f2fs_balance_fs(sbi);

	return 0;

out:

	clear_nlink(inode);

	unlock_new_inode(inode);

	iput(inode);

	alloc_nid_failed(sbi, ino);

	return err;

}



static int f2fs_link(struct dentry *old_dentry, struct inode *dir,

		struct dentry *dentry)

{

	struct inode *inode = old_dentry->d_inode;

	struct super_block *sb = dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	int err;



	inode->i_ctime = CURRENT_TIME;

	atomic_inc(&inode->i_count);



	set_inode_flag(F2FS_I(inode), FI_INC_LINK);

	err = f2fs_add_link(dentry, inode);

	if (err)

		goto out;



	d_instantiate(dentry, inode);



	f2fs_balance_fs(sbi);

	return 0;

out:

	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);

	iput(inode);

	return err;

}



struct dentry *f2fs_get_parent(struct dentry *child)

{

	struct qstr dotdot = QSTR_INIT("..", 2);

	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);

	if (!ino)

		return ERR_PTR(-ENOENT);

	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));

}



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;



	if (dentry->d_name.len > F2FS_MAX_NAME_LEN)

		return ERR_PTR(-ENAMETOOLONG);



	de = f2fs_find_entry(dir, &dentry->d_name, &page);

	if (de) {

		nid_t ino = le32_to_cpu(de->ino);

		kunmap(page);

		f2fs_put_page(page, 0);



		inode = f2fs_iget(dir->i_sb, ino);

		if (IS_ERR(inode))

			return ERR_CAST(inode);

	}



	return d_splice_alias(inode, dentry);

}



static int f2fs_unlink(struct inode *dir, struct dentry *dentry)

{

	struct super_block *sb = dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	struct inode *inode = dentry->d_inode;

	struct f2fs_dir_entry *de;

	struct page *page;

	int err = -ENOENT;



	de = f2fs_find_entry(dir, &dentry->d_name, &page);

	if (!de)

		goto fail;



	err = check_orphan_space(sbi);

	if (err) {

		kunmap(page);

		f2fs_put_page(page, 0);

		goto fail;

	}



	f2fs_delete_entry(de, page, inode);



	/* In order to evict this inode,  we set it dirty */

	mark_inode_dirty(inode);

	f2fs_balance_fs(sbi);

fail:

	return err;

}



static int f2fs_symlink(struct inode *dir, struct dentry *dentry,

					const char *symname)

{

	struct super_block *sb = dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	struct inode *inode;

	unsigned symlen = strlen(symname) + 1;

	int err;



	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);

	if (IS_ERR(inode))

		return PTR_ERR(inode);



	inode->i_op = &f2fs_symlink_inode_operations;

	inode->i_mapping->a_ops = &f2fs_dblock_aops;



	err = f2fs_add_link(dentry, inode);

	if (err)

		goto out;



	err = page_symlink(inode, symname, symlen);

	alloc_nid_done(sbi, inode->i_ino);



	d_instantiate(dentry, inode);

	unlock_new_inode(inode);



	f2fs_balance_fs(sbi);



	return err;

out:

	clear_nlink(inode);

	unlock_new_inode(inode);

	iput(inode);

	alloc_nid_failed(sbi, inode->i_ino);

	return err;

}



static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)

{

	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);

	struct inode *inode;

	int err;



	inode = f2fs_new_inode(dir, S_IFDIR | mode);

	err = PTR_ERR(inode);

	if (IS_ERR(inode))

		return err;



	inode->i_op = &f2fs_dir_inode_operations;

	inode->i_fop = &f2fs_dir_operations;

	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS | __GFP_ZERO);



	set_inode_flag(F2FS_I(inode), FI_INC_LINK);

	err = f2fs_add_link(dentry, inode);

	if (err)

		goto out_fail;



	alloc_nid_done(sbi, inode->i_ino);



	d_instantiate(dentry, inode);

	unlock_new_inode(inode);



	f2fs_balance_fs(sbi);

	return 0;



out_fail:

	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);

	clear_nlink(inode);

	unlock_new_inode(inode);

	iput(inode);

	alloc_nid_failed(sbi, inode->i_ino);

	return err;

}



static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)

{

	struct inode *inode = dentry->d_inode;

	if (f2fs_empty_dir(inode))

		return f2fs_unlink(dir, dentry);

	return -ENOTEMPTY;

}



static int f2fs_mknod(struct inode *dir, struct dentry *dentry,

				umode_t mode, dev_t rdev)

{

	struct super_block *sb = dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	struct inode *inode;

	int err = 0;



	if (!new_valid_dev(rdev))

		return -EINVAL;



	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;



	err = f2fs_add_link(dentry, inode);

	if (err)

		goto out;



	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);

	unlock_new_inode(inode);



	f2fs_balance_fs(sbi);



	return 0;

out:

	clear_nlink(inode);

	unlock_new_inode(inode);

	iput(inode);

	alloc_nid_failed(sbi, inode->i_ino);

	return err;

}



static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,

			struct inode *new_dir, struct dentry *new_dentry)

{

	struct super_block *sb = old_dir->i_sb;

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	struct inode *old_inode = old_dentry->d_inode;

	struct inode *new_inode = new_dentry->d_inode;

	struct page *old_dir_page;

	struct page *old_page;

	struct f2fs_dir_entry *old_dir_entry = NULL;

	struct f2fs_dir_entry *old_entry;

	struct f2fs_dir_entry *new_entry;

	int err = -ENOENT;



	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;

	}



	mutex_lock_op(sbi, RENAME);



	if (new_inode) {

		struct page *new_page;



		err = -ENOTEMPTY;

		if (old_dir_entry && !f2fs_empty_dir(new_inode))

			goto out_dir;



		err = -ENOENT;

		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,

						&new_page);

		if (!new_entry)

			goto out_dir;



		f2fs_set_link(new_dir, new_entry, new_page, old_inode);



		new_inode->i_ctime = CURRENT_TIME;

		if (old_dir_entry)

			drop_nlink(new_inode);

		drop_nlink(new_inode);

		if (!new_inode->i_nlink)

			add_orphan_inode(sbi, new_inode->i_ino);

		f2fs_write_inode(new_inode, NULL);

	} else {

		err = f2fs_add_link(new_dentry, old_inode);

		if (err)

			goto out_dir;



		if (old_dir_entry) {

			inc_nlink(new_dir);

			f2fs_write_inode(new_dir, NULL);

		}

	}



	old_inode->i_ctime = CURRENT_TIME;

	set_inode_flag(F2FS_I(old_inode), FI_NEED_CP);

	mark_inode_dirty(old_inode);



	f2fs_delete_entry(old_entry, old_page, NULL);



	if (old_dir_entry) {

		if (old_dir != new_dir) {

			f2fs_set_link(old_inode, old_dir_entry,

						old_dir_page, new_dir);

		} else {

			kunmap(old_dir_page);

			f2fs_put_page(old_dir_page, 0);

		}

		drop_nlink(old_dir);

		f2fs_write_inode(old_dir, NULL);

	}



	mutex_unlock_op(sbi, RENAME);



	f2fs_balance_fs(sbi);

	return 0;



out_dir:

	if (old_dir_entry) {

		kunmap(old_dir_page);

		f2fs_put_page(old_dir_page, 0);

	}

	mutex_unlock_op(sbi, RENAME);

out_old:

	kunmap(old_page);

	f2fs_put_page(old_page, 0);

out:

	return err;

}



const struct inode_operations f2fs_dir_inode_operations = {

	.create		= f2fs_create,

	.lookup		= f2fs_lookup,

	.link		= f2fs_link,

	.unlink		= f2fs_unlink,

	.symlink	= f2fs_symlink,

	.mkdir		= f2fs_mkdir,

	.rmdir		= f2fs_rmdir,

	.mknod		= f2fs_mknod,

	.rename		= f2fs_rename,

	.setattr	= f2fs_setattr,

	.get_acl	= f2fs_get_acl,

#ifdef CONFIG_F2FS_FS_XATTR

	.setxattr	= generic_setxattr,

	.getxattr	= generic_getxattr,

	.listxattr	= f2fs_listxattr,

	.removexattr	= generic_removexattr,

#endif

};



const struct inode_operations f2fs_symlink_inode_operations = {

	.readlink       = generic_readlink,

	.follow_link    = page_follow_link_light,

	.put_link       = page_put_link,

	.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 = {

	.setattr        = f2fs_setattr,

	.get_acl	= f2fs_get_acl,

#ifdef CONFIG_F2FS_FS_XATTR

	.setxattr       = generic_setxattr,

	.getxattr       = generic_getxattr,

	.listxattr	= f2fs_listxattr,

	.removexattr    = generic_removexattr,

#endif

};