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Commit fbfa2cc5 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: add file operations 



This adds memory operations and file/file_inode operations.

- F2FS supports fallocate(), mmap(), fsync(), and basic ioctl().

Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 351df4b2

fs/f2fs/file.c

0 → 100644
+637 −0
Original line number Original line Diff line number Diff line 
/**

 * 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/falloc.h>

#include <linux/types.h>

#include <linux/uaccess.h>

#include <linux/mount.h>



#include "f2fs.h"

#include "node.h"

#include "segment.h"

#include "xattr.h"

#include "acl.h"



static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,

						struct vm_fault *vmf)

{

	struct page *page = vmf->page;

	struct inode *inode = vma->vm_file->f_path.dentry->d_inode;

	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	struct page *node_page;

	block_t old_blk_addr;

	struct dnode_of_data dn;

	int err;



	f2fs_balance_fs(sbi);



	sb_start_pagefault(inode->i_sb);



	mutex_lock_op(sbi, DATA_NEW);



	/* block allocation */

	set_new_dnode(&dn, inode, NULL, NULL, 0);

	err = get_dnode_of_data(&dn, page->index, 0);

	if (err) {

		mutex_unlock_op(sbi, DATA_NEW);

		goto out;

	}



	old_blk_addr = dn.data_blkaddr;

	node_page = dn.node_page;



	if (old_blk_addr == NULL_ADDR) {

		err = reserve_new_block(&dn);

		if (err) {

			f2fs_put_dnode(&dn);

			mutex_unlock_op(sbi, DATA_NEW);

			goto out;

		}

	}

	f2fs_put_dnode(&dn);



	mutex_unlock_op(sbi, DATA_NEW);



	lock_page(page);

	if (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 out;



	/* fill the page */

	wait_on_page_writeback(page);



	/* page is wholly or partially inside EOF */

	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {

		unsigned offset;

		offset = i_size_read(inode) & ~PAGE_CACHE_MASK;

		zero_user_segment(page, offset, PAGE_CACHE_SIZE);

	}

	set_page_dirty(page);

	SetPageUptodate(page);



	file_update_time(vma->vm_file);

out:

	sb_end_pagefault(inode->i_sb);

	return block_page_mkwrite_return(err);

}



static const struct vm_operations_struct f2fs_file_vm_ops = {

	.fault        = filemap_fault,

	.page_mkwrite = f2fs_vm_page_mkwrite,

};



static int need_to_sync_dir(struct f2fs_sb_info *sbi, struct inode *inode)

{

	struct dentry *dentry;

	nid_t pino;



	inode = igrab(inode);

	dentry = d_find_any_alias(inode);

	if (!dentry) {

		iput(inode);

		return 0;

	}

	pino = dentry->d_parent->d_inode->i_ino;

	dput(dentry);

	iput(inode);

	return !is_checkpointed_node(sbi, pino);

}



int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)

{

	struct inode *inode = file->f_mapping->host;

	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	unsigned long long cur_version;

	int ret = 0;

	bool need_cp = false;

	struct writeback_control wbc = {

		.sync_mode = WB_SYNC_ALL,

		.nr_to_write = LONG_MAX,

		.for_reclaim = 0,

	};



	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);

	if (ret)

		return ret;



	mutex_lock(&inode->i_mutex);



	if (inode->i_sb->s_flags & MS_RDONLY)

		goto out;

	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))

		goto out;



	mutex_lock(&sbi->cp_mutex);

	cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver);

	mutex_unlock(&sbi->cp_mutex);



	if (F2FS_I(inode)->data_version != cur_version &&

					!(inode->i_state & I_DIRTY))

		goto out;

	F2FS_I(inode)->data_version--;



	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)

		need_cp = true;

	if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP))

		need_cp = true;

	if (!space_for_roll_forward(sbi))

		need_cp = true;

	if (need_to_sync_dir(sbi, inode))

		need_cp = true;



	f2fs_write_inode(inode, NULL);



	if (need_cp) {

		/* all the dirty node pages should be flushed for POR */

		ret = f2fs_sync_fs(inode->i_sb, 1);

		clear_inode_flag(F2FS_I(inode), FI_NEED_CP);

	} else {

		while (sync_node_pages(sbi, inode->i_ino, &wbc) == 0)

			f2fs_write_inode(inode, NULL);

		filemap_fdatawait_range(sbi->node_inode->i_mapping,

							0, LONG_MAX);

	}

out:

	mutex_unlock(&inode->i_mutex);

	return ret;

}



static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)

{

	file_accessed(file);

	vma->vm_ops = &f2fs_file_vm_ops;

	return 0;

}



static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)

{

	int nr_free = 0, ofs = dn->ofs_in_node;

	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);

	struct f2fs_node *raw_node;

	__le32 *addr;



	raw_node = page_address(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;



		update_extent_cache(NULL_ADDR, dn);

		invalidate_blocks(sbi, blkaddr);

		dec_valid_block_count(sbi, dn->inode, 1);

		nr_free++;

	}

	if (nr_free) {

		set_page_dirty(dn->node_page);

		sync_inode_page(dn);

	}

	dn->ofs_in_node = ofs;

	return nr_free;

}



void truncate_data_blocks(struct dnode_of_data *dn)

{

	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);

}



static void truncate_partial_data_page(struct inode *inode, u64 from)

{

	unsigned offset = from & (PAGE_CACHE_SIZE - 1);

	struct page *page;



	if (!offset)

		return;



	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT);

	if (IS_ERR(page))

		return;



	lock_page(page);

	wait_on_page_writeback(page);

	zero_user(page, offset, PAGE_CACHE_SIZE - offset);

	set_page_dirty(page);

	f2fs_put_page(page, 1);

}



static int truncate_blocks(struct inode *inode, u64 from)

{

	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	unsigned int blocksize = inode->i_sb->s_blocksize;

	struct dnode_of_data dn;

	pgoff_t free_from;

	int count = 0;

	int err;



	free_from = (pgoff_t)

			((from + blocksize - 1) >> (sbi->log_blocksize));



	mutex_lock_op(sbi, DATA_TRUNC);



	set_new_dnode(&dn, inode, NULL, NULL, 0);

	err = get_dnode_of_data(&dn, free_from, RDONLY_NODE);

	if (err) {

		if (err == -ENOENT)

			goto free_next;

		mutex_unlock_op(sbi, DATA_TRUNC);

		return err;

	}



	if (IS_INODE(dn.node_page))

		count = ADDRS_PER_INODE;

	else

		count = ADDRS_PER_BLOCK;



	count -= dn.ofs_in_node;

	BUG_ON(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);

	mutex_unlock_op(sbi, DATA_TRUNC);



	/* lastly zero out the first data page */

	truncate_partial_data_page(inode, from);



	return err;

}



void f2fs_truncate(struct inode *inode)

{

	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||

				S_ISLNK(inode->i_mode)))

		return;



	if (!truncate_blocks(inode, i_size_read(inode))) {

		inode->i_mtime = inode->i_ctime = CURRENT_TIME;

		mark_inode_dirty(inode);

	}



	f2fs_balance_fs(F2FS_SB(inode->i_sb));

}



static int f2fs_getattr(struct vfsmount *mnt,

			 struct dentry *dentry, struct kstat *stat)

{

	struct inode *inode = dentry->d_inode;

	generic_fillattr(inode, stat);

	stat->blocks <<= 3;

	return 0;

}



#ifdef CONFIG_F2FS_FS_POSIX_ACL

static void __setattr_copy(struct inode *inode, const struct iattr *attr)

{

	struct f2fs_inode_info *fi = F2FS_I(inode);

	unsigned int ia_valid = attr->ia_valid;



	if (ia_valid & ATTR_UID)

		inode->i_uid = attr->ia_uid;

	if (ia_valid & ATTR_GID)

		inode->i_gid = attr->ia_gid;

	if (ia_valid & ATTR_ATIME)

		inode->i_atime = timespec_trunc(attr->ia_atime,

						inode->i_sb->s_time_gran);

	if (ia_valid & ATTR_MTIME)

		inode->i_mtime = timespec_trunc(attr->ia_mtime,

						inode->i_sb->s_time_gran);

	if (ia_valid & ATTR_CTIME)

		inode->i_ctime = timespec_trunc(attr->ia_ctime,

						inode->i_sb->s_time_gran);

	if (ia_valid & ATTR_MODE) {

		umode_t mode = attr->ia_mode;



		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))

			mode &= ~S_ISGID;

		set_acl_inode(fi, mode);

	}

}

#else

#define __setattr_copy setattr_copy

#endif



int f2fs_setattr(struct dentry *dentry, struct iattr *attr)

{

	struct inode *inode = dentry->d_inode;

	struct f2fs_inode_info *fi = F2FS_I(inode);

	int err;



	err = inode_change_ok(inode, attr);

	if (err)

		return err;



	if ((attr->ia_valid & ATTR_SIZE) &&

			attr->ia_size != i_size_read(inode)) {

		truncate_setsize(inode, attr->ia_size);

		f2fs_truncate(inode);

	}



	__setattr_copy(inode, attr);



	if (attr->ia_valid & ATTR_MODE) {

		err = f2fs_acl_chmod(inode);

		if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {

			inode->i_mode = fi->i_acl_mode;

			clear_inode_flag(fi, FI_ACL_MODE);

		}

	}



	mark_inode_dirty(inode);

	return err;

}



const struct inode_operations f2fs_file_inode_operations = {

	.getattr	= f2fs_getattr,

	.setattr	= f2fs_setattr,

	.get_acl	= f2fs_get_acl,

#ifdef CONFIG_F2FS_FS_XATTR

	.setxattr	= generic_setxattr,

	.getxattr	= generic_getxattr,

	.listxattr	= f2fs_listxattr,

	.removexattr	= generic_removexattr,

#endif

};



static void fill_zero(struct inode *inode, pgoff_t index,

					loff_t start, loff_t len)

{

	struct page *page;



	if (!len)

		return;



	page = get_new_data_page(inode, index, false);



	if (!IS_ERR(page)) {

		wait_on_page_writeback(page);

		zero_user(page, start, len);

		set_page_dirty(page);

		f2fs_put_page(page, 1);

	}

}



int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)

{

	pgoff_t index;

	int err;



	for (index = pg_start; index < pg_end; index++) {

		struct dnode_of_data dn;

		struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);



		mutex_lock_op(sbi, DATA_TRUNC);

		set_new_dnode(&dn, inode, NULL, NULL, 0);

		err = get_dnode_of_data(&dn, index, RDONLY_NODE);

		if (err) {

			mutex_unlock_op(sbi, DATA_TRUNC);

			if (err == -ENOENT)

				continue;

			return err;

		}



		if (dn.data_blkaddr != NULL_ADDR)

			truncate_data_blocks_range(&dn, 1);

		f2fs_put_dnode(&dn);

		mutex_unlock_op(sbi, DATA_TRUNC);

	}

	return 0;

}



static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)

{

	pgoff_t pg_start, pg_end;

	loff_t off_start, off_end;

	int ret = 0;



	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;

	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;



	off_start = offset & (PAGE_CACHE_SIZE - 1);

	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);



	if (pg_start == pg_end) {

		fill_zero(inode, pg_start, off_start,

						off_end - off_start);

	} else {

		if (off_start)

			fill_zero(inode, pg_start++, off_start,

					PAGE_CACHE_SIZE - off_start);

		if (off_end)

			fill_zero(inode, pg_end, 0, off_end);



		if (pg_start < pg_end) {

			struct address_space *mapping = inode->i_mapping;

			loff_t blk_start, blk_end;



			blk_start = pg_start << PAGE_CACHE_SHIFT;

			blk_end = pg_end << PAGE_CACHE_SHIFT;

			truncate_inode_pages_range(mapping, blk_start,

					blk_end - 1);

			ret = truncate_hole(inode, pg_start, pg_end);

		}

	}



	if (!(mode & FALLOC_FL_KEEP_SIZE) &&

		i_size_read(inode) <= (offset + len)) {

		i_size_write(inode, offset);

		mark_inode_dirty(inode);

	}



	return ret;

}



static int expand_inode_data(struct inode *inode, loff_t offset,

					loff_t len, int mode)

{

	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	pgoff_t index, pg_start, pg_end;

	loff_t new_size = i_size_read(inode);

	loff_t off_start, off_end;

	int ret = 0;



	ret = inode_newsize_ok(inode, (len + offset));

	if (ret)

		return ret;



	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;

	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;



	off_start = offset & (PAGE_CACHE_SIZE - 1);

	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);



	for (index = pg_start; index <= pg_end; index++) {

		struct dnode_of_data dn;



		mutex_lock_op(sbi, DATA_NEW);



		set_new_dnode(&dn, inode, NULL, NULL, 0);

		ret = get_dnode_of_data(&dn, index, 0);

		if (ret) {

			mutex_unlock_op(sbi, DATA_NEW);

			break;

		}



		if (dn.data_blkaddr == NULL_ADDR) {

			ret = reserve_new_block(&dn);

			if (ret) {

				f2fs_put_dnode(&dn);

				mutex_unlock_op(sbi, DATA_NEW);

				break;

			}

		}

		f2fs_put_dnode(&dn);



		mutex_unlock_op(sbi, DATA_NEW);



		if (pg_start == pg_end)

			new_size = offset + len;

		else if (index == pg_start && off_start)

			new_size = (index + 1) << PAGE_CACHE_SHIFT;

		else if (index == pg_end)

			new_size = (index << PAGE_CACHE_SHIFT) + off_end;

		else

			new_size += PAGE_CACHE_SIZE;

	}



	if (!(mode & FALLOC_FL_KEEP_SIZE) &&

		i_size_read(inode) < new_size) {

		i_size_write(inode, new_size);

		mark_inode_dirty(inode);

	}



	return ret;

}



static long f2fs_fallocate(struct file *file, int mode,

				loff_t offset, loff_t len)

{

	struct inode *inode = file->f_path.dentry->d_inode;

	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	long ret;



	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))

		return -EOPNOTSUPP;



	if (mode & FALLOC_FL_PUNCH_HOLE)

		ret = punch_hole(inode, offset, len, mode);

	else

		ret = expand_inode_data(inode, offset, len, mode);



	f2fs_balance_fs(sbi);

	return ret;

}



#define F2FS_REG_FLMASK		(~(FS_DIRSYNC_FL | FS_TOPDIR_FL))

#define F2FS_OTHER_FLMASK	(FS_NODUMP_FL | FS_NOATIME_FL)



static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)

{

	if (S_ISDIR(mode))

		return flags;

	else if (S_ISREG(mode))

		return flags & F2FS_REG_FLMASK;

	else

		return flags & F2FS_OTHER_FLMASK;

}



long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	struct inode *inode = filp->f_dentry->d_inode;

	struct f2fs_inode_info *fi = F2FS_I(inode);

	unsigned int flags;

	int ret;



	switch (cmd) {

	case FS_IOC_GETFLAGS:

		flags = fi->i_flags & FS_FL_USER_VISIBLE;

		return put_user(flags, (int __user *) arg);

	case FS_IOC_SETFLAGS:

	{

		unsigned int oldflags;



		ret = mnt_want_write(filp->f_path.mnt);

		if (ret)

			return ret;



		if (!inode_owner_or_capable(inode)) {

			ret = -EACCES;

			goto out;

		}



		if (get_user(flags, (int __user *) arg)) {

			ret = -EFAULT;

			goto out;

		}



		flags = f2fs_mask_flags(inode->i_mode, flags);



		mutex_lock(&inode->i_mutex);



		oldflags = fi->i_flags;



		if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {

			if (!capable(CAP_LINUX_IMMUTABLE)) {

				mutex_unlock(&inode->i_mutex);

				ret = -EPERM;

				goto out;

			}

		}



		flags = flags & FS_FL_USER_MODIFIABLE;

		flags |= oldflags & ~FS_FL_USER_MODIFIABLE;

		fi->i_flags = flags;

		mutex_unlock(&inode->i_mutex);



		f2fs_set_inode_flags(inode);

		inode->i_ctime = CURRENT_TIME;

		mark_inode_dirty(inode);

out:

		mnt_drop_write(filp->f_path.mnt);

		return ret;

	}

	default:

		return -ENOTTY;

	}

}



const struct file_operations f2fs_file_operations = {

	.llseek		= generic_file_llseek,

	.read		= do_sync_read,

	.write		= do_sync_write,

	.aio_read	= generic_file_aio_read,

	.aio_write	= generic_file_aio_write,

	.open		= generic_file_open,

	.mmap		= f2fs_file_mmap,

	.fsync		= f2fs_sync_file,

	.fallocate	= f2fs_fallocate,

	.unlocked_ioctl	= f2fs_ioctl,

	.splice_read	= generic_file_splice_read,

	.splice_write	= generic_file_splice_write,

};