[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"

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

	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);
}
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
	19	struct f2fs_iget_args {
	20	u64 ino;
	21	int on_free;
	22	};
	23
	24	void f2fs_set_inode_flags(struct inode *inode)
	25	{
	26	unsigned int flags = F2FS_I(inode)->i_flags;
	27
	28	inode->i_flags &= ~(S_SYNC \| S_APPEND \| S_IMMUTABLE \|
	29	S_NOATIME \| S_DIRSYNC);
	30
	31	if (flags & FS_SYNC_FL)
	32	inode->i_flags \|= S_SYNC;
	33	if (flags & FS_APPEND_FL)
	34	inode->i_flags \|= S_APPEND;
	35	if (flags & FS_IMMUTABLE_FL)
	36	inode->i_flags \|= S_IMMUTABLE;
	37	if (flags & FS_NOATIME_FL)
	38	inode->i_flags \|= S_NOATIME;
	39	if (flags & FS_DIRSYNC_FL)
	40	inode->i_flags \|= S_DIRSYNC;
	41	}
	42
	43	static int f2fs_iget_test(struct inode inode, void data)
	44	{
	45	struct f2fs_iget_args *args = data;
	46
	47	if (inode->i_ino != args->ino)
	48	return 0;
	49	if (inode->i_state & (I_FREEING \| I_WILL_FREE)) {
	50	args->on_free = 1;
	51	return 0;
	52	}
	53	return 1;
	54	}
	55
	56	struct inode f2fs_iget_nowait(struct super_block sb, unsigned long ino)
	57	{
	58	struct f2fs_iget_args args = {
	59	.ino = ino,
	60	.on_free = 0
	61	};
	62	struct inode *inode = ilookup5(sb, ino, f2fs_iget_test, &args);
	63
	64	if (inode)
	65	return inode;
66	if (!args.on_free)
67	return f2fs_iget(sb, ino);
68	return ERR_PTR(-ENOENT);
69	}
70
71	static int do_read_inode(struct inode *inode)
72	{
73	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
74	struct f2fs_inode_info *fi = F2FS_I(inode);
75	struct page *node_page;
76	struct f2fs_node *rn;
77	struct f2fs_inode *ri;
78
79	/* Check if ino is within scope */
80	check_nid_range(sbi, inode->i_ino);
81
82	node_page = get_node_page(sbi, inode->i_ino);
83	if (IS_ERR(node_page))
84	return PTR_ERR(node_page);
85
86	rn = page_address(node_page);
87	ri = &(rn->i);
88
89	inode->i_mode = le16_to_cpu(ri->i_mode);
90	i_uid_write(inode, le32_to_cpu(ri->i_uid));
91	i_gid_write(inode, le32_to_cpu(ri->i_gid));
92	set_nlink(inode, le32_to_cpu(ri->i_links));
93	inode->i_size = le64_to_cpu(ri->i_size);
94	inode->i_blocks = le64_to_cpu(ri->i_blocks);
95
96	inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
97	inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
98	inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
99	inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
100	inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
101	inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
102	inode->i_generation = le32_to_cpu(ri->i_generation);
7d79e75f CL	103	if (ri->i_addr[0])
	104	inode->i_rdev = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
	105	else
	106	inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));
19f99cee JK	107
	108	fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
	109	fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
	110	fi->i_flags = le32_to_cpu(ri->i_flags);
	111	fi->flags = 0;
	112	fi->data_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver) - 1;
	113	fi->i_advise = ri->i_advise;
6666e6aa	114	fi->i_pino = le32_to_cpu(ri->i_pino);
19f99cee JK	115	get_extent_info(&fi->ext, ri->i_ext);
	116	f2fs_put_page(node_page, 1);
	117	return 0;
	118	}
	119
	120	struct inode f2fs_iget(struct super_block sb, unsigned long ino)
	121	{
	122	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	123	struct inode *inode;
	124	int ret;
	125
	126	inode = iget_locked(sb, ino);
	127	if (!inode)
	128	return ERR_PTR(-ENOMEM);
	129	if (!(inode->i_state & I_NEW))
	130	return inode;
	131	if (ino == F2FS_NODE_INO(sbi) \|\| ino == F2FS_META_INO(sbi))
	132	goto make_now;
	133
	134	ret = do_read_inode(inode);
	135	if (ret)
	136	goto bad_inode;
	137
	138	if (!sbi->por_doing && inode->i_nlink == 0) {
	139	ret = -ENOENT;
	140	goto bad_inode;
	141	}
	142
	143	make_now:
	144	if (ino == F2FS_NODE_INO(sbi)) {
	145	inode->i_mapping->a_ops = &f2fs_node_aops;
	146	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
	147	} else if (ino == F2FS_META_INO(sbi)) {
	148	inode->i_mapping->a_ops = &f2fs_meta_aops;
	149	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
	150	} else if (S_ISREG(inode->i_mode)) {
	151	inode->i_op = &f2fs_file_inode_operations;
	152	inode->i_fop = &f2fs_file_operations;
	153	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	154	} else if (S_ISDIR(inode->i_mode)) {
	155	inode->i_op = &f2fs_dir_inode_operations;
	156	inode->i_fop = &f2fs_dir_operations;
	157	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	158	mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE \|
	159	__GFP_ZERO);
	160	} else if (S_ISLNK(inode->i_mode)) {
	161	inode->i_op = &f2fs_symlink_inode_operations;
	162	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	163	} else if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode) \|\|
	164	S_ISFIFO(inode->i_mode) \|\| S_ISSOCK(inode->i_mode)) {
	165	inode->i_op = &f2fs_special_inode_operations;
	166	init_special_inode(inode, inode->i_mode, inode->i_rdev);
	167	} else {
	168	ret = -EIO;
	169	goto bad_inode;
	170	}
	171	unlock_new_inode(inode);
	172
	173	return inode;
	174
	175	bad_inode:
	176	iget_failed(inode);
	177	return ERR_PTR(ret);
	178	}
179
180	void update_inode(struct inode inode, struct page node_page)
181	{
182	struct f2fs_node *rn;
183	struct f2fs_inode *ri;
184
185	wait_on_page_writeback(node_page);
186
187	rn = page_address(node_page);
188	ri = &(rn->i);
189
190	ri->i_mode = cpu_to_le16(inode->i_mode);
191	ri->i_advise = F2FS_I(inode)->i_advise;
192	ri->i_uid = cpu_to_le32(i_uid_read(inode));
193	ri->i_gid = cpu_to_le32(i_gid_read(inode));
194	ri->i_links = cpu_to_le32(inode->i_nlink);
195	ri->i_size = cpu_to_le64(i_size_read(inode));
196	ri->i_blocks = cpu_to_le64(inode->i_blocks);
197	set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
198
199	ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
200	ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
201	ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
202	ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
203	ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
204	ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
205	ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
206	ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
207	ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
6666e6aa	208	ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
19f99cee	209	ri->i_generation = cpu_to_le32(inode->i_generation);
7d79e75f CL	210
	211	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode)) {
	212	if (old_valid_dev(inode->i_rdev)) {
	213	ri->i_addr[0] =
	214	cpu_to_le32(old_encode_dev(inode->i_rdev));
	215	ri->i_addr[1] = 0;
	216	} else {
	217	ri->i_addr[0] = 0;
	218	ri->i_addr[1] =
	219	cpu_to_le32(new_encode_dev(inode->i_rdev));
	220	ri->i_addr[2] = 0;
	221	}
	222	}
	223
398b1ac5	224	set_cold_node(inode, node_page);
19f99cee JK	225	set_page_dirty(node_page);
	226	}
	227
	228	int f2fs_write_inode(struct inode inode, struct writeback_control wbc)
	229	{
	230	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	231	struct page *node_page;
	232	bool need_lock = false;
	233
	234	if (inode->i_ino == F2FS_NODE_INO(sbi) \|\|
	235	inode->i_ino == F2FS_META_INO(sbi))
	236	return 0;
	237
7d82db83 JK	238	if (wbc)
	239	f2fs_balance_fs(sbi);
	240
19f99cee JK	241	node_page = get_node_page(sbi, inode->i_ino);
	242	if (IS_ERR(node_page))
	243	return PTR_ERR(node_page);
	244
	245	if (!PageDirty(node_page)) {
	246	need_lock = true;
	247	f2fs_put_page(node_page, 1);
	248	mutex_lock(&sbi->write_inode);
	249	node_page = get_node_page(sbi, inode->i_ino);
	250	if (IS_ERR(node_page)) {
	251	mutex_unlock(&sbi->write_inode);
	252	return PTR_ERR(node_page);
	253	}
	254	}
	255	update_inode(inode, node_page);
	256	f2fs_put_page(node_page, 1);
	257	if (need_lock)
	258	mutex_unlock(&sbi->write_inode);
	259	return 0;
	260	}
	261
0a8165d7	262	/*
19f99cee JK	263	* Called at the last iput() if i_nlink is zero
	264	*/
	265	void f2fs_evict_inode(struct inode *inode)
	266	{
	267	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	268
	269	truncate_inode_pages(&inode->i_data, 0);
	270
	271	if (inode->i_ino == F2FS_NODE_INO(sbi) \|\|
	272	inode->i_ino == F2FS_META_INO(sbi))
	273	goto no_delete;
	274
	275	BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
	276	remove_dirty_dir_inode(inode);
	277
	278	if (inode->i_nlink \|\| is_bad_inode(inode))
	279	goto no_delete;
	280
	281	set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
	282	i_size_write(inode, 0);
	283
	284	if (F2FS_HAS_BLOCKS(inode))
	285	f2fs_truncate(inode);
	286
	287	remove_inode_page(inode);
	288	no_delete:
	289	clear_inode(inode);
	290	}