[deliverable/linux.git] / fs / f2fs / inode.c

/*
 * 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"

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 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 */
	if (check_nid_range(sbi, inode->i_ino)) {
		f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
			 (unsigned long) inode->i_ino);
		return -EINVAL;
	}

	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);
	if (ri->i_addr[0])
		inode->i_rdev = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
	else
		inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));

	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->i_advise = ri->i_advise;
	fi->i_pino = le32_to_cpu(ri->i_pino);
	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_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
	ri->i_generation = cpu_to_le32(inode->i_generation);

	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
		if (old_valid_dev(inode->i_rdev)) {
			ri->i_addr[0] =
				cpu_to_le32(old_encode_dev(inode->i_rdev));
			ri->i_addr[1] = 0;
		} else {
			ri->i_addr[0] = 0;
			ri->i_addr[1] =
				cpu_to_le32(new_encode_dev(inode->i_rdev));
			ri->i_addr[2] = 0;
		}
	}

	set_cold_node(inode, node_page);
	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;

	if (wbc)
		f2fs_balance_fs(sbi);

	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;

	sb_start_intwrite(inode->i_sb);
	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);
	sb_end_intwrite(inode->i_sb);
no_delete:
	clear_inode(inode);
}
Commit	Line	Data
0a8165d7	1	/*
19f99cee JK	2	* fs/f2fs/inode.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13	#include <linux/buffer_head.h>
	14	#include <linux/writeback.h>
	15
	16	#include "f2fs.h"
	17	#include "node.h"
	18
19f99cee JK	19	void f2fs_set_inode_flags(struct inode *inode)
	20	{
	21	unsigned int flags = F2FS_I(inode)->i_flags;
	22
	23	inode->i_flags &= ~(S_SYNC \| S_APPEND \| S_IMMUTABLE \|
	24	S_NOATIME \| S_DIRSYNC);
	25
	26	if (flags & FS_SYNC_FL)
	27	inode->i_flags \|= S_SYNC;
	28	if (flags & FS_APPEND_FL)
	29	inode->i_flags \|= S_APPEND;
	30	if (flags & FS_IMMUTABLE_FL)
	31	inode->i_flags \|= S_IMMUTABLE;
	32	if (flags & FS_NOATIME_FL)
	33	inode->i_flags \|= S_NOATIME;
	34	if (flags & FS_DIRSYNC_FL)
	35	inode->i_flags \|= S_DIRSYNC;
	36	}
	37
19f99cee JK	38	static int do_read_inode(struct inode *inode)
	39	{
	40	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	41	struct f2fs_inode_info *fi = F2FS_I(inode);
	42	struct page *node_page;
	43	struct f2fs_node *rn;
	44	struct f2fs_inode *ri;
	45
	46	/* Check if ino is within scope */
064e0823 NJ	47	if (check_nid_range(sbi, inode->i_ino)) {
	48	f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
	49	(unsigned long) inode->i_ino);
	50	return -EINVAL;
	51	}
19f99cee JK	52
	53	node_page = get_node_page(sbi, inode->i_ino);
	54	if (IS_ERR(node_page))
	55	return PTR_ERR(node_page);
	56
	57	rn = page_address(node_page);
	58	ri = &(rn->i);
	59
	60	inode->i_mode = le16_to_cpu(ri->i_mode);
	61	i_uid_write(inode, le32_to_cpu(ri->i_uid));
	62	i_gid_write(inode, le32_to_cpu(ri->i_gid));
	63	set_nlink(inode, le32_to_cpu(ri->i_links));
	64	inode->i_size = le64_to_cpu(ri->i_size);
	65	inode->i_blocks = le64_to_cpu(ri->i_blocks);
	66
	67	inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
	68	inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
	69	inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
	70	inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
	71	inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
	72	inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
	73	inode->i_generation = le32_to_cpu(ri->i_generation);
7d79e75f CL	74	if (ri->i_addr[0])
	75	inode->i_rdev = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
	76	else
	77	inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));
19f99cee JK	78
	79	fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
	80	fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
	81	fi->i_flags = le32_to_cpu(ri->i_flags);
	82	fi->flags = 0;
19f99cee	83	fi->i_advise = ri->i_advise;
6666e6aa	84	fi->i_pino = le32_to_cpu(ri->i_pino);
19f99cee JK	85	get_extent_info(&fi->ext, ri->i_ext);
	86	f2fs_put_page(node_page, 1);
	87	return 0;
	88	}
	89
	90	struct inode f2fs_iget(struct super_block sb, unsigned long ino)
	91	{
	92	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	93	struct inode *inode;
	94	int ret;
	95
	96	inode = iget_locked(sb, ino);
	97	if (!inode)
	98	return ERR_PTR(-ENOMEM);
	99	if (!(inode->i_state & I_NEW))
	100	return inode;
	101	if (ino == F2FS_NODE_INO(sbi) \|\| ino == F2FS_META_INO(sbi))
	102	goto make_now;
	103
	104	ret = do_read_inode(inode);
	105	if (ret)
	106	goto bad_inode;
	107
	108	if (!sbi->por_doing && inode->i_nlink == 0) {
	109	ret = -ENOENT;
	110	goto bad_inode;
	111	}
	112
	113	make_now:
	114	if (ino == F2FS_NODE_INO(sbi)) {
	115	inode->i_mapping->a_ops = &f2fs_node_aops;
	116	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
	117	} else if (ino == F2FS_META_INO(sbi)) {
	118	inode->i_mapping->a_ops = &f2fs_meta_aops;
	119	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
	120	} else if (S_ISREG(inode->i_mode)) {
	121	inode->i_op = &f2fs_file_inode_operations;
	122	inode->i_fop = &f2fs_file_operations;
	123	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	124	} else if (S_ISDIR(inode->i_mode)) {
	125	inode->i_op = &f2fs_dir_inode_operations;
	126	inode->i_fop = &f2fs_dir_operations;
	127	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	128	mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE \|
	129	__GFP_ZERO);
	130	} else if (S_ISLNK(inode->i_mode)) {
	131	inode->i_op = &f2fs_symlink_inode_operations;
	132	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	133	} else if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode) \|\|
	134	S_ISFIFO(inode->i_mode) \|\| S_ISSOCK(inode->i_mode)) {
	135	inode->i_op = &f2fs_special_inode_operations;
	136	init_special_inode(inode, inode->i_mode, inode->i_rdev);
	137	} else {
	138	ret = -EIO;
	139	goto bad_inode;
	140	}
	141	unlock_new_inode(inode);
	142
	143	return inode;
	144
	145	bad_inode:
	146	iget_failed(inode);
	147	return ERR_PTR(ret);
	148	}
149
150	void update_inode(struct inode inode, struct page node_page)
151	{
152	struct f2fs_node *rn;
153	struct f2fs_inode *ri;
154
155	wait_on_page_writeback(node_page);
156
157	rn = page_address(node_page);
158	ri = &(rn->i);
159
160	ri->i_mode = cpu_to_le16(inode->i_mode);
161	ri->i_advise = F2FS_I(inode)->i_advise;
162	ri->i_uid = cpu_to_le32(i_uid_read(inode));
163	ri->i_gid = cpu_to_le32(i_gid_read(inode));
164	ri->i_links = cpu_to_le32(inode->i_nlink);
165	ri->i_size = cpu_to_le64(i_size_read(inode));
166	ri->i_blocks = cpu_to_le64(inode->i_blocks);
167	set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
168
169	ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
170	ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
171	ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
172	ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
173	ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
174	ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
175	ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
176	ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
177	ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
6666e6aa	178	ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
19f99cee	179	ri->i_generation = cpu_to_le32(inode->i_generation);
7d79e75f CL	180
	181	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode)) {
	182	if (old_valid_dev(inode->i_rdev)) {
	183	ri->i_addr[0] =
	184	cpu_to_le32(old_encode_dev(inode->i_rdev));
	185	ri->i_addr[1] = 0;
	186	} else {
	187	ri->i_addr[0] = 0;
	188	ri->i_addr[1] =
	189	cpu_to_le32(new_encode_dev(inode->i_rdev));
	190	ri->i_addr[2] = 0;
	191	}
	192	}
	193
398b1ac5	194	set_cold_node(inode, node_page);
19f99cee JK	195	set_page_dirty(node_page);
	196	}
	197
	198	int f2fs_write_inode(struct inode inode, struct writeback_control wbc)
	199	{
	200	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	201	struct page *node_page;
	202	bool need_lock = false;
	203
	204	if (inode->i_ino == F2FS_NODE_INO(sbi) \|\|
	205	inode->i_ino == F2FS_META_INO(sbi))
	206	return 0;
	207
7d82db83 JK	208	if (wbc)
	209	f2fs_balance_fs(sbi);
	210
19f99cee JK	211	node_page = get_node_page(sbi, inode->i_ino);
	212	if (IS_ERR(node_page))
	213	return PTR_ERR(node_page);
	214
	215	if (!PageDirty(node_page)) {
	216	need_lock = true;
	217	f2fs_put_page(node_page, 1);
	218	mutex_lock(&sbi->write_inode);
	219	node_page = get_node_page(sbi, inode->i_ino);
	220	if (IS_ERR(node_page)) {
	221	mutex_unlock(&sbi->write_inode);
	222	return PTR_ERR(node_page);
	223	}
	224	}
	225	update_inode(inode, node_page);
	226	f2fs_put_page(node_page, 1);
	227	if (need_lock)
	228	mutex_unlock(&sbi->write_inode);
	229	return 0;
	230	}
	231
0a8165d7	232	/*
19f99cee JK	233	* Called at the last iput() if i_nlink is zero
	234	*/
	235	void f2fs_evict_inode(struct inode *inode)
	236	{
	237	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	238
	239	truncate_inode_pages(&inode->i_data, 0);
	240
	241	if (inode->i_ino == F2FS_NODE_INO(sbi) \|\|
	242	inode->i_ino == F2FS_META_INO(sbi))
	243	goto no_delete;
	244
	245	BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
	246	remove_dirty_dir_inode(inode);
	247
	248	if (inode->i_nlink \|\| is_bad_inode(inode))
	249	goto no_delete;
	250
d6212a5f	251	sb_start_intwrite(inode->i_sb);
19f99cee JK	252	set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
	253	i_size_write(inode, 0);
	254
	255	if (F2FS_HAS_BLOCKS(inode))
	256	f2fs_truncate(inode);
	257
	258	remove_inode_page(inode);
d6212a5f	259	sb_end_intwrite(inode->i_sb);
19f99cee JK	260	no_delete:
	261	clear_inode(inode);
	262	}