fs/f2fs/inode.c - maze/linux - Git at Google

 /*
  * 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"

 #include <trace/events/f2fs.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 void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
 {
 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 		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]));
 	}
 }

 static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
 {
 	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;
 		}
 	}
 }

 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_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);

 	ri = F2FS_INODE(node_page);

 	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->i_advise = ri->i_advise;
 	fi->i_pino = le32_to_cpu(ri->i_pino);
 	fi->i_dir_level = ri->i_dir_level;

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

 	/* get rdev by using inline_info */
 	__get_inode_rdev(inode, ri);

 	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 = 0;

 	inode = iget_locked(sb, ino);
 	if (!inode)
 		return ERR_PTR(-ENOMEM);

 	if (!(inode->i_state & I_NEW)) {
 		trace_f2fs_iget(inode);
 		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;
 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_F2FS_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);
 	trace_f2fs_iget(inode);
 	return inode;

 bad_inode:
 	iget_failed(inode);
 	trace_f2fs_iget_exit(inode, ret);
 	return ERR_PTR(ret);
 }

 void update_inode(struct inode *inode, struct page *node_page)
 {
 	struct f2fs_inode *ri;

 	f2fs_wait_on_page_writeback(node_page, NODE);

 	ri = F2FS_INODE(node_page);

 	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);
 	set_raw_inline(F2FS_I(inode), ri);

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

 	__set_inode_rdev(inode, ri);
 	set_cold_node(inode, node_page);
 	set_page_dirty(node_page);

 	clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 }

 void update_inode_page(struct inode *inode)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 	struct page *node_page;
 retry:
 	node_page = get_node_page(sbi, inode->i_ino);
 	if (IS_ERR(node_page)) {
 		int err = PTR_ERR(node_page);
 		if (err == -ENOMEM) {
 			cond_resched();
 			goto retry;
 		} else if (err != -ENOENT) {
 			f2fs_stop_checkpoint(sbi);
 		}
 		return;
 	}
 	update_inode(inode, node_page);
 	f2fs_put_page(node_page, 1);
 }

 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

 	if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 			inode->i_ino == F2FS_META_INO(sbi))
 		return 0;

 	if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 		return 0;

 	/*
 	 * We need to lock here to prevent from producing dirty node pages
 	 * during the urgent cleaning time when runing out of free sections.
 	 */
 	f2fs_lock_op(sbi);
 	update_inode_page(inode);
 	f2fs_unlock_op(sbi);

 	if (wbc)
 		f2fs_balance_fs(sbi);

 	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);

 	trace_f2fs_evict_inode(inode);
 	truncate_inode_pages_final(&inode->i_data);

 	if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 			inode->i_ino == F2FS_META_INO(sbi))
 		goto no_delete;

 	f2fs_bug_on(get_dirty_dents(inode));
 	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);

 	f2fs_lock_op(sbi);
 	remove_inode_page(inode);
 	stat_dec_inline_inode(inode);
 	f2fs_unlock_op(sbi);

 	sb_end_intwrite(inode->i_sb);
 no_delete:
 	clear_inode(inode);
 }
	/*
	* 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"

	#include <trace/events/f2fs.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 void __get_inode_rdev(struct inode inode, struct f2fs_inode ri)
	{
	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode) \|\|
	S_ISFIFO(inode->i_mode) \|\| S_ISSOCK(inode->i_mode)) {
	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]));
	}
	}

	static void __set_inode_rdev(struct inode inode, struct f2fs_inode ri)
	{
	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;
	}
	}
	}

	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_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);

	ri = F2FS_INODE(node_page);

	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->i_advise = ri->i_advise;
	fi->i_pino = le32_to_cpu(ri->i_pino);
	fi->i_dir_level = ri->i_dir_level;

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

	/* get rdev by using inline_info */
	__get_inode_rdev(inode, ri);

	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 = 0;

	inode = iget_locked(sb, ino);
	if (!inode)
	return ERR_PTR(-ENOMEM);

	if (!(inode->i_state & I_NEW)) {
	trace_f2fs_iget(inode);
	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;
	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_F2FS_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);
	trace_f2fs_iget(inode);
	return inode;

	bad_inode:
	iget_failed(inode);
	trace_f2fs_iget_exit(inode, ret);
	return ERR_PTR(ret);
	}

	void update_inode(struct inode inode, struct page node_page)
	{
	struct f2fs_inode *ri;

	f2fs_wait_on_page_writeback(node_page, NODE);

	ri = F2FS_INODE(node_page);

	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);
	set_raw_inline(F2FS_I(inode), ri);

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

	__set_inode_rdev(inode, ri);
	set_cold_node(inode, node_page);
	set_page_dirty(node_page);

	clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
	}

	void update_inode_page(struct inode *inode)
	{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	struct page *node_page;
	retry:
	node_page = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(node_page)) {
	int err = PTR_ERR(node_page);
	if (err == -ENOMEM) {
	cond_resched();
	goto retry;
	} else if (err != -ENOENT) {
	f2fs_stop_checkpoint(sbi);
	}
	return;
	}
	update_inode(inode, node_page);
	f2fs_put_page(node_page, 1);
	}

	int f2fs_write_inode(struct inode inode, struct writeback_control wbc)
	{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	if (inode->i_ino == F2FS_NODE_INO(sbi) \|\|
	inode->i_ino == F2FS_META_INO(sbi))
	return 0;

	if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
	return 0;

	/*
	* We need to lock here to prevent from producing dirty node pages
	* during the urgent cleaning time when runing out of free sections.
	*/
	f2fs_lock_op(sbi);
	update_inode_page(inode);
	f2fs_unlock_op(sbi);

	if (wbc)
	f2fs_balance_fs(sbi);

	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);

	trace_f2fs_evict_inode(inode);
	truncate_inode_pages_final(&inode->i_data);

	if (inode->i_ino == F2FS_NODE_INO(sbi) \|\|
	inode->i_ino == F2FS_META_INO(sbi))
	goto no_delete;

	f2fs_bug_on(get_dirty_dents(inode));
	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);

	f2fs_lock_op(sbi);
	remove_inode_page(inode);
	stat_dec_inline_inode(inode);
	f2fs_unlock_op(sbi);

	sb_end_intwrite(inode->i_sb);
	no_delete:
	clear_inode(inode);
	}