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Commit 19f99cee authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: add core inode operations 



This adds core functions to get, read, write, and evict an inode.

Signed-off-by: default avatarChangman Lee <cm224.lee@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent eb47b800

fs/f2fs/inode.c

0 → 100644
+266 −0
Original line number Diff line number Diff line 
/**

 * fs/f2fs/inode.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/buffer_head.h>

#include <linux/writeback.h>



#include "f2fs.h"

#include "node.h"



struct f2fs_iget_args {

	u64 ino;

	int on_free;

};



void f2fs_set_inode_flags(struct inode *inode)

{

	unsigned int flags = F2FS_I(inode)->i_flags;



	inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE |

			S_NOATIME | S_DIRSYNC);



	if (flags & FS_SYNC_FL)

		inode->i_flags |= S_SYNC;

	if (flags & FS_APPEND_FL)

		inode->i_flags |= S_APPEND;

	if (flags & FS_IMMUTABLE_FL)

		inode->i_flags |= S_IMMUTABLE;

	if (flags & FS_NOATIME_FL)

		inode->i_flags |= S_NOATIME;

	if (flags & FS_DIRSYNC_FL)

		inode->i_flags |= S_DIRSYNC;

}



static int f2fs_iget_test(struct inode *inode, void *data)

{

	struct f2fs_iget_args *args = data;



	if (inode->i_ino != args->ino)

		return 0;

	if (inode->i_state & (I_FREEING | I_WILL_FREE)) {

		args->on_free = 1;

		return 0;

	}

	return 1;

}



struct inode *f2fs_iget_nowait(struct super_block *sb, unsigned long ino)

{

	struct f2fs_iget_args args = {

		.ino = ino,

		.on_free = 0

	};

	struct inode *inode = ilookup5(sb, ino, f2fs_iget_test, &args);



	if (inode)

		return inode;

	if (!args.on_free)

		return f2fs_iget(sb, ino);

	return ERR_PTR(-ENOENT);

}



static int do_read_inode(struct inode *inode)

{

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

	struct f2fs_inode_info *fi = F2FS_I(inode);

	struct page *node_page;

	struct f2fs_node *rn;

	struct f2fs_inode *ri;



	/* Check if ino is within scope */

	check_nid_range(sbi, inode->i_ino);



	node_page = get_node_page(sbi, inode->i_ino);

	if (IS_ERR(node_page))

		return PTR_ERR(node_page);



	rn = page_address(node_page);

	ri = &(rn->i);



	inode->i_mode = le16_to_cpu(ri->i_mode);

	i_uid_write(inode, le32_to_cpu(ri->i_uid));

	i_gid_write(inode, le32_to_cpu(ri->i_gid));

	set_nlink(inode, le32_to_cpu(ri->i_links));

	inode->i_size = le64_to_cpu(ri->i_size);

	inode->i_blocks = le64_to_cpu(ri->i_blocks);



	inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);

	inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);

	inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);

	inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);

	inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);

	inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);

	inode->i_generation = le32_to_cpu(ri->i_generation);



	fi->i_current_depth = le32_to_cpu(ri->i_current_depth);

	fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);

	fi->i_flags = le32_to_cpu(ri->i_flags);

	fi->flags = 0;

	fi->data_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver) - 1;

	fi->i_advise = ri->i_advise;

	get_extent_info(&fi->ext, ri->i_ext);

	f2fs_put_page(node_page, 1);

	return 0;

}



struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)

{

	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	struct inode *inode;

	int ret;



	inode = iget_locked(sb, ino);

	if (!inode)

		return ERR_PTR(-ENOMEM);

	if (!(inode->i_state & I_NEW))

		return inode;

	if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))

		goto make_now;



	ret = do_read_inode(inode);

	if (ret)

		goto bad_inode;



	if (!sbi->por_doing && inode->i_nlink == 0) {

		ret = -ENOENT;

		goto bad_inode;

	}



make_now:

	if (ino == F2FS_NODE_INO(sbi)) {

		inode->i_mapping->a_ops = &f2fs_node_aops;

		mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);

	} else if (ino == F2FS_META_INO(sbi)) {

		inode->i_mapping->a_ops = &f2fs_meta_aops;

		mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);

	} else if (S_ISREG(inode->i_mode)) {

		inode->i_op = &f2fs_file_inode_operations;

		inode->i_fop = &f2fs_file_operations;

		inode->i_mapping->a_ops = &f2fs_dblock_aops;

	} else if (S_ISDIR(inode->i_mode)) {

		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_HIGHUSER_MOVABLE |

				__GFP_ZERO);

	} else if (S_ISLNK(inode->i_mode)) {

		inode->i_op = &f2fs_symlink_inode_operations;

		inode->i_mapping->a_ops = &f2fs_dblock_aops;

	} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||

			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {

		inode->i_op = &f2fs_special_inode_operations;

		init_special_inode(inode, inode->i_mode, inode->i_rdev);

	} else {

		ret = -EIO;

		goto bad_inode;

	}

	unlock_new_inode(inode);



	return inode;



bad_inode:

	iget_failed(inode);

	return ERR_PTR(ret);

}



void update_inode(struct inode *inode, struct page *node_page)

{

	struct f2fs_node *rn;

	struct f2fs_inode *ri;



	wait_on_page_writeback(node_page);



	rn = page_address(node_page);

	ri = &(rn->i);



	ri->i_mode = cpu_to_le16(inode->i_mode);

	ri->i_advise = F2FS_I(inode)->i_advise;

	ri->i_uid = cpu_to_le32(i_uid_read(inode));

	ri->i_gid = cpu_to_le32(i_gid_read(inode));

	ri->i_links = cpu_to_le32(inode->i_nlink);

	ri->i_size = cpu_to_le64(i_size_read(inode));

	ri->i_blocks = cpu_to_le64(inode->i_blocks);

	set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);



	ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);

	ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);

	ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);

	ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);

	ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);

	ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);

	ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);

	ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);

	ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);

	ri->i_generation = cpu_to_le32(inode->i_generation);

	set_page_dirty(node_page);

}



int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)

{

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

	struct page *node_page;

	bool need_lock = false;



	if (inode->i_ino == F2FS_NODE_INO(sbi) ||

			inode->i_ino == F2FS_META_INO(sbi))

		return 0;



	node_page = get_node_page(sbi, inode->i_ino);

	if (IS_ERR(node_page))

		return PTR_ERR(node_page);



	if (!PageDirty(node_page)) {

		need_lock = true;

		f2fs_put_page(node_page, 1);

		mutex_lock(&sbi->write_inode);

		node_page = get_node_page(sbi, inode->i_ino);

		if (IS_ERR(node_page)) {

			mutex_unlock(&sbi->write_inode);

			return PTR_ERR(node_page);

		}

	}

	update_inode(inode, node_page);

	f2fs_put_page(node_page, 1);

	if (need_lock)

		mutex_unlock(&sbi->write_inode);

	return 0;

}



/**

 * Called at the last iput() if i_nlink is zero

 */

void f2fs_evict_inode(struct inode *inode)

{

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



	truncate_inode_pages(&inode->i_data, 0);



	if (inode->i_ino == F2FS_NODE_INO(sbi) ||

			inode->i_ino == F2FS_META_INO(sbi))

		goto no_delete;



	BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));

	remove_dirty_dir_inode(inode);



	if (inode->i_nlink || is_bad_inode(inode))

		goto no_delete;



	set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);

	i_size_write(inode, 0);



	if (F2FS_HAS_BLOCKS(inode))

		f2fs_truncate(inode);



	remove_inode_page(inode);

no_delete:

	clear_inode(inode);

}