Release 4.10 fs/f2fs/file.c

/*
 * fs/f2fs/file.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/stat.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/falloc.h>
#include <linux/types.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/mount.h>
#include <linux/pagevec.h>
#include <linux/uuid.h>
#include <linux/file.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"
#include "gc.h"
#include "trace.h"
#include <trace/events/f2fs.h>



static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
						struct vm_fault *vmf)
{
	struct page *page = vmf->page;
	struct inode *inode = file_inode(vma->vm_file);
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct dnode_of_data dn;
	int err;

	sb_start_pagefault(inode->i_sb);

	f2fs_bug_on(sbi, f2fs_has_inline_data(inode));

	/* block allocation */
	f2fs_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = f2fs_reserve_block(&dn, page->index);
	if (err) {
		f2fs_unlock_op(sbi);
		goto out;
	}
	f2fs_put_dnode(&dn);
	f2fs_unlock_op(sbi);

	f2fs_balance_fs(sbi, dn.node_changed);

	file_update_time(vma->vm_file);
	lock_page(page);
	if (unlikely(page->mapping != inode->i_mapping ||
			page_offset(page) > i_size_read(inode) ||
			!PageUptodate(page))) {
		unlock_page(page);
		err = -EFAULT;
		goto out;
	}

	/*
         * check to see if the page is mapped already (no holes)
         */
	if (PageMappedToDisk(page))
		goto mapped;

	/* page is wholly or partially inside EOF */
	if (((loff_t)(page->index + 1) << PAGE_SHIFT) >
						i_size_read(inode)) {
		unsigned offset;
		offset = i_size_read(inode) & ~PAGE_MASK;
		zero_user_segment(page, offset, PAGE_SIZE);
	}
	set_page_dirty(page);
	if (!PageUptodate(page))
		SetPageUptodate(page);

	trace_f2fs_vm_page_mkwrite(page, DATA);
mapped:
	/* fill the page */
	f2fs_wait_on_page_writeback(page, DATA, false);

	/* wait for GCed encrypted page writeback */
	if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
		f2fs_wait_on_encrypted_page_writeback(sbi, dn.data_blkaddr);

out:
	sb_end_pagefault(inode->i_sb);
	f2fs_update_time(sbi, REQ_TIME);
	return block_page_mkwrite_return(err);
}

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jaegeuk kim
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12
63.16%
chao yu
chao yu
29
8.68%
2
10.53%
namjae jeon
namjae jeon
13
3.89%
1
5.26%
al viro
al viro
3
0.90%
1
5.26%
kirill a. shutemov
kirill a. shutemov
3
0.90%
1
5.26%
gu zheng
gu zheng
1
0.30%
1
5.26%
huajun li
huajun li
1
0.30%
1
5.26%
Total
334
100.00%
19
100.00%


static const struct vm_operations_struct f2fs_file_vm_ops = {
	.fault		= filemap_fault,
	.map_pages	= filemap_map_pages,
	.page_mkwrite	= f2fs_vm_page_mkwrite,
};



static int get_parent_ino(struct inode *inode, nid_t *pino)
{
	struct dentry *dentry;

	inode = igrab(inode);
	dentry = d_find_any_alias(inode);
	iput(inode);
	if (!dentry)
		return 0;

	if (update_dent_inode(inode, inode, &dentry->d_name)) {
		dput(dentry);
		return 0;
	}

	*pino = parent_ino(dentry);
	dput(dentry);
	return 1;
}

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static inline bool need_do_checkpoint(struct inode *inode)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	bool need_cp = false;

	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
		need_cp = true;
	else if (is_sbi_flag_set(sbi, SBI_NEED_CP))
		need_cp = true;
	else if (file_wrong_pino(inode))
		need_cp = true;
	else if (!space_for_roll_forward(sbi))
		need_cp = true;
	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
		need_cp = true;
	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
		need_cp = true;
	else if (test_opt(sbi, FASTBOOT))
		need_cp = true;
	else if (sbi->active_logs == 2)
		need_cp = true;

	return need_cp;
}

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73.42%
1
16.67%
jaegeuk kim
jaegeuk kim
42
26.58%
5
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static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
{
	struct page *i = find_get_page(NODE_MAPPING(sbi), ino);
	bool ret = false;
	/* But we need to avoid that there are some inode updates */
	if ((i && PageDirty(i)) || need_inode_block_update(sbi, ino))
		ret = true;
	f2fs_put_page(i, 0);
	return ret;
}

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static void try_to_fix_pino(struct inode *inode)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	nid_t pino;

	down_write(&fi->i_sem);
	fi->xattr_ver = 0;
	if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
			get_parent_ino(inode, &pino)) {
		f2fs_i_pino_write(inode, pino);
		file_got_pino(inode);
	}
	up_write(&fi->i_sem);
}

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jaegeuk kim
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6.17%
1
50.00%
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2
100.00%



static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
						int datasync, bool atomic)
{
	struct inode *inode = file->f_mapping->host;
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	nid_t ino = inode->i_ino;
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
		.sync_mode = WB_SYNC_ALL,
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
        };

	if (unlikely(f2fs_readonly(inode->i_sb)))
		return 0;

	trace_f2fs_sync_file_enter(inode);

	/* if fdatasync is triggered, let's do in-place-update */
	if (datasync || get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
		set_inode_flag(inode, FI_NEED_IPU);
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	clear_inode_flag(inode, FI_NEED_IPU);

	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
		return ret;
	}

	/* if the inode is dirty, let's recover all the time */
	if (!f2fs_skip_inode_update(inode, datasync)) {
		f2fs_write_inode(inode, NULL);
		goto go_write;
	}

	/*
         * if there is no written data, don't waste time to write recovery info.
         */
	if (!is_inode_flag_set(inode, FI_APPEND_WRITE) &&
			!exist_written_data(sbi, ino, APPEND_INO)) {

		/* it may call write_inode just prior to fsync */
		if (need_inode_page_update(sbi, ino))
			goto go_write;

		if (is_inode_flag_set(inode, FI_UPDATE_WRITE) ||
				exist_written_data(sbi, ino, UPDATE_INO))
			goto flush_out;
		goto out;
	}
go_write:
	/*
         * Both of fdatasync() and fsync() are able to be recovered from
         * sudden-power-off.
         */
	down_read(&F2FS_I(inode)->i_sem);
	need_cp = need_do_checkpoint(inode);
	up_read(&F2FS_I(inode)->i_sem);

	if (need_cp) {
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);

		/*
                 * We've secured consistency through sync_fs. Following pino
                 * will be used only for fsynced inodes after checkpoint.
                 */
		try_to_fix_pino(inode);
		clear_inode_flag(inode, FI_APPEND_WRITE);
		clear_inode_flag(inode, FI_UPDATE_WRITE);
		goto out;
	}
sync_nodes:
	ret = fsync_node_pages(sbi, inode, &wbc, atomic);
	if (ret)
		goto out;

	/* if cp_error was enabled, we should avoid infinite loop */
	if (unlikely(f2fs_cp_error(sbi))) {
		ret = -EIO;
		goto out;
	}

	if (need_inode_block_update(sbi, ino)) {
		f2fs_mark_inode_dirty_sync(inode, true);
		f2fs_write_inode(inode, NULL);
		goto sync_nodes;
	}

	ret = wait_on_node_pages_writeback(sbi, ino);
	if (ret)
		goto out;

	/* once recovery info is written, don't need to tack this */
	remove_ino_entry(sbi, ino, APPEND_INO);
	clear_inode_flag(inode, FI_APPEND_WRITE);
flush_out:
	remove_ino_entry(sbi, ino, UPDATE_INO);
	clear_inode_flag(inode, FI_UPDATE_WRITE);
	ret = f2fs_issue_flush(sbi);
	f2fs_update_time(sbi, REQ_TIME);
out:
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
	f2fs_trace_ios(NULL, 1);
	return ret;
}

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jaegeuk kim
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78.57%
namjae jeon
namjae jeon
38
7.88%
2
4.76%
changman lee
changman lee
19
3.94%
3
7.14%
chao yu
chao yu
13
2.70%
4
9.52%
Total
482
100.00%
42
100.00%



int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	return f2fs_do_sync_file(file, start, end, datasync, false);
}

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static pgoff_t __get_first_dirty_index(struct address_space *mapping,
						pgoff_t pgofs, int whence)
{
	struct pagevec pvec;
	int nr_pages;

	if (whence != SEEK_DATA)
		return 0;

	/* find first dirty page index */
	pagevec_init(&pvec, 0);
	nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
					PAGECACHE_TAG_DIRTY, 1);
	pgofs = nr_pages ? pvec.pages[0]->index : ULONG_MAX;
	pagevec_release(&pvec);
	return pgofs;
}

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static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
							int whence)
{
	switch (whence) {
	case SEEK_DATA:
		if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
			(blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
			return true;
		break;
	case SEEK_HOLE:
		if (blkaddr == NULL_ADDR)
			return true;
		break;
	}
	return false;
}

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static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes = inode->i_sb->s_maxbytes;
	struct dnode_of_data dn;
	pgoff_t pgofs, end_offset, dirty;
	loff_t data_ofs = offset;
	loff_t isize;
	int err = 0;

	inode_lock(inode);

	isize = i_size_read(inode);
	if (offset >= isize)
		goto fail;

	/* handle inline data case */
	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
		if (whence == SEEK_HOLE)
			data_ofs = isize;
		goto found;
	}

	pgofs = (pgoff_t)(offset >> PAGE_SHIFT);

	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);

	for (; data_ofs < isize; data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE);
		if (err && err != -ENOENT) {
			goto fail;
		} else if (err == -ENOENT) {
			/* direct node does not exists */
			if (whence == SEEK_DATA) {
				pgofs = get_next_page_offset(&dn, pgofs);
				continue;
			} else {
				goto found;
			}
		}

		end_offset = ADDRS_PER_PAGE(dn.node_page, inode);

		/* find data/hole in dnode block */
		for (; dn.ofs_in_node < end_offset;
				dn.ofs_in_node++, pgofs++,
				data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
			block_t blkaddr;
			blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);

			if (__found_offset(blkaddr, dirty, pgofs, whence)) {
				f2fs_put_dnode(&dn);
				goto found;
			}
		}
		f2fs_put_dnode(&dn);
	}

	if (whence == SEEK_DATA)
		goto fail;
found:
	if (whence == SEEK_HOLE && data_ofs > isize)
		data_ofs = isize;
	inode_unlock(inode);
	return vfs_setpos(file, data_ofs, maxbytes);
fail:
	inode_unlock(inode);
	return -ENXIO;
}

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jaegeuk kim
jaegeuk kim
38
10.41%
3
25.00%
kirill a. shutemov
kirill a. shutemov
3
0.82%
1
8.33%
al viro
al viro
3
0.82%
1
8.33%
arter 97
arter 97
1
0.27%
1
8.33%
Total
365
100.00%
12
100.00%



static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes = inode->i_sb->s_maxbytes;

	switch (whence) {
	case SEEK_SET:
	case SEEK_CUR:
	case SEEK_END:
		return generic_file_llseek_size(file, offset, whence,
						maxbytes, i_size_read(inode));
	case SEEK_DATA:
	case SEEK_HOLE:
		if (offset < 0)
			return -ENXIO;
		return f2fs_seek_block(file, offset, whence);
	}

	return -EINVAL;
}

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chao yu
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jaegeuk kim
10
10.10%
1
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99
100.00%
2
100.00%



static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct inode *inode = file_inode(file);
	int err;

	if (f2fs_encrypted_inode(inode)) {
		err = fscrypt_get_encryption_info(inode);
		if (err)
			return 0;
		if (!f2fs_encrypted_inode(inode))
			return -ENOKEY;
	}

	/* we don't need to use inline_data strictly */
	err = f2fs_convert_inline_inode(inode);
	if (err)
		return err;

	file_accessed(file);
	vma->vm_ops = &f2fs_file_vm_ops;
	return 0;
}

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12
12.77%
1
16.67%
Total
94
100.00%
6
100.00%



static int f2fs_file_open(struct inode *inode, struct file *filp)
{
	int ret = generic_file_open(inode, filp);
	struct dentry *dir;

	if (!ret && f2fs_encrypted_inode(inode)) {
		ret = fscrypt_get_encryption_info(inode);
		if (ret)
			return -EACCES;
		if (!fscrypt_has_encryption_key(inode))
			return -ENOKEY;
	}
	dir = dget_parent(file_dentry(filp));
	if (f2fs_encrypted_inode(d_inode(dir)) &&
			!fscrypt_has_permitted_context(d_inode(dir), inode)) {
		dput(dir);
		return -EPERM;
	}
	dput(dir);
	return ret;
}

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80.00%
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chao yu
13
10.83%
1
20.00%
Total
120
100.00%
5
100.00%



int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
	struct f2fs_node *raw_node;
	int nr_free = 0, ofs = dn->ofs_in_node, len = count;
	__le32 *addr;

	raw_node = F2FS_NODE(dn->node_page);
	addr = blkaddr_in_node(raw_node) + ofs;

	for (; count > 0; count--, addr++, dn->ofs_in_node++) {
		block_t blkaddr = le32_to_cpu(*addr);
		if (blkaddr == NULL_ADDR)
			continue;

		dn->data_blkaddr = NULL_ADDR;
		set_data_blkaddr(dn);
		invalidate_blocks(sbi, blkaddr);
		if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
			clear_inode_flag(dn->inode, FI_FIRST_BLOCK_WRITTEN);
		nr_free++;
	}

	if (nr_free) {
		pgoff_t fofs;
		/*
                 * once we invalidate valid blkaddr in range [ofs, ofs + count],
                 * we will invalidate all blkaddr in the whole range.
                 */
		fofs = start_bidx_of_node(ofs_of_node(dn->node_page),
							dn->inode) + ofs;
		f2fs_update_extent_cache_range(dn, fofs, 0, len);
		dec_valid_block_count(sbi, dn->inode, nr_free);
	}
	dn->ofs_in_node = ofs;

	f2fs_update_time(sbi, REQ_TIME);
	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
	return nr_free;
}

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jaegeuk kim
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64.94%
5
50.00%
chao yu
chao yu
53
22.94%
2
20.00%
namjae jeon
namjae jeon
27
11.69%
2
20.00%
gu zheng
gu zheng
1
0.43%
1
10.00%
Total
231
100.00%
10
100.00%



void truncate_data_blocks(struct dnode_of_data *dn)
{
	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
}

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static int truncate_partial_data_page(struct inode *inode, u64 from,
								bool cache_only)
{
	unsigned offset = from & (PAGE_SIZE - 1);
	pgoff_t index = from >> PAGE_SHIFT;
	struct address_space *mapping = inode->i_mapping;
	struct page *page;

	if (!offset && !cache_only)
		return 0;

	if (cache_only) {
		page = find_lock_page(mapping, index);
		if (page && PageUptodate(page))
			goto truncate_out;
		f2fs_put_page(page, 1);
		return 0;
	}

	page = get_lock_data_page(inode, index, true);
	if (IS_ERR(page))
		return 0;
truncate_out:
	f2fs_wait_on_page_writeback(page, DATA, true);
	zero_user(page, offset, PAGE_SIZE - offset);
	if (!cache_only || !f2fs_encrypted_inode(inode) ||
					!S_ISREG(inode->i_mode))
		set_page_dirty(page);
	f2fs_put_page(page, 1);
	return 0;
}

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jaegeuk kim
jaegeuk kim
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10
76.92%
chao yu
chao yu
11
6.32%
2
15.38%
kirill a. shutemov
kirill a. shutemov
3
1.72%
1
7.69%
Total
174
100.00%
13
100.00%



int truncate_blocks(struct inode *inode, u64 from, bool lock)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
	int count = 0, err = 0;
	struct page *ipage;
	bool truncate_page = false;

	trace_f2fs_truncate_blocks_enter(inode, from);

	free_from = (pgoff_t)F2FS_BYTES_TO_BLK(from + blocksize - 1);

	if (free_from >= sbi->max_file_blocks)
		goto free_partial;

	if (lock)
		f2fs_lock_op(sbi);

	ipage = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage)) {
		err = PTR_ERR(ipage);
		goto out;
	}

	if (f2fs_has_inline_data(inode)) {
		if (truncate_inline_inode(ipage, from))
			set_page_dirty(ipage);
		f2fs_put_page(ipage, 1);
		truncate_page = true;
		goto out;
	}

	set_new_dnode(&dn, inode, ipage, NULL, 0);
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE_RA);
	if (err) {
		if (err == -ENOENT)
			goto free_next;
		goto out;
	}

	count = ADDRS_PER_PAGE(dn.node_page, inode);

	count -= dn.ofs_in_node;
	f2fs_bug_on(sbi, count < 0);

	if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
		truncate_data_blocks_range(&dn, count);
		free_from += count;
	}

	f2fs_put_dnode(&dn);
free_next:
	err = truncate_inode_blocks(inode, free_from);
out:
	if (lock)
		f2fs_unlock_op(sbi);
free_partial:
	/* lastly zero out the first data page */
	if (!err)
		err = truncate_partial_data_page(inode, from, truncate_page);

	trace_f2fs_truncate_blocks_exit(inode, err);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jaegeuk kim
jaegeuk kim
265
81.54%
11
64.71%
chao yu
chao yu
42
12.92%
3
17.65%
namjae jeon
namjae jeon
14
4.31%
1
5.88%
huajun li
huajun li
3
0.92%
1
5.88%
gu zheng
gu zheng
1
0.31%
1
5.88%
Total
325
100.00%
17
100.00%



int f2fs_truncate(struct inode *inode)
{
	int err;

	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
				S_ISLNK(inode->i_mode)))
		return 0;

	trace_f2fs_truncate(inode);

	/* we should check inline_data size */
	if (!f2fs_may_inline_data(inode)) {
		err = f2fs_convert_inline_inode(inode);
		if (err)
			return err;
	}