litmus-rt-tegra.git - LITMUS^RT and MC^2 V0 support for the NVIDIA Tegra 3 SoC

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ng.com> 2012-12-10 23:43:41 -0500 f2fs: add inode operations for special inodes' href='/cgit/cgit.cgi/litmus-rt-edfsc.git/commit/fs/f2fs/namei.c?h=linux-4.9-litmus&id=57397d86c62dfee7bf1d60c9960201c78a9c4ec2'>57397d86c62d

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/*
 * 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 "node.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/f2fs.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);

	f2fs_lock_op(sbi);
	if (!alloc_nid(sbi, &ino)) {
		f2fs_unlock_op(sbi);
		err = -ENOSPC;
		goto fail;
	}
	f2fs_unlock_op(sbi);

	inode_init_owner(inode, dir, mode);

	inode->i_ino = ino;
	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;
	}
	trace_f2fs_new_inode(inode, 0);
	mark_inode_dirty(inode);
	return inode;

out:
	clear_nlink(inode);
	unlock_new_inode(inode);
fail:
	trace_f2fs_new_inode(inode, err);
	make_bad_inode(inode);
	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)
{
	size_t slen = strlen(s);
	size_t sublen = strlen(sub);

	if (sublen > slen)
		return 0;

	return !strncasecmp(s + slen - sublen, sub, sublen);
}

/*
 * Set multimedia files as cold files for hot/cold data separation
 */
static inline void set_cold_files(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])) {
			file_set_cold(inode);
			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;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
		set_cold_files(sbi, inode, dentry->d_name.name);

	inode->i_op = &f2fs_file_inode_operations;


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