664 lines
15 KiB
C
664 lines
15 KiB
C
/*
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* fs/f2fs/file.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/stat.h>
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#include <linux/buffer_head.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/falloc.h>
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#include <linux/types.h>
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#include <linux/compat.h>
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#include <linux/uaccess.h>
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#include <linux/mount.h>
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#include "f2fs.h"
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#include "node.h"
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#include "segment.h"
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#include "xattr.h"
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#include "acl.h"
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#include <trace/events/f2fs.h>
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static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
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struct vm_fault *vmf)
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{
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struct page *page = vmf->page;
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struct inode *inode = file_inode(vma->vm_file);
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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block_t old_blk_addr;
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struct dnode_of_data dn;
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int err, ilock;
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f2fs_balance_fs(sbi);
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sb_start_pagefault(inode->i_sb);
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/* block allocation */
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ilock = mutex_lock_op(sbi);
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
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if (err) {
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mutex_unlock_op(sbi, ilock);
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goto out;
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}
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old_blk_addr = dn.data_blkaddr;
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if (old_blk_addr == NULL_ADDR) {
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err = reserve_new_block(&dn);
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if (err) {
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f2fs_put_dnode(&dn);
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mutex_unlock_op(sbi, ilock);
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goto out;
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}
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}
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f2fs_put_dnode(&dn);
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mutex_unlock_op(sbi, ilock);
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lock_page(page);
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if (page->mapping != inode->i_mapping ||
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page_offset(page) >= i_size_read(inode) ||
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!PageUptodate(page)) {
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unlock_page(page);
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err = -EFAULT;
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goto out;
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}
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/*
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* check to see if the page is mapped already (no holes)
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*/
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if (PageMappedToDisk(page))
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goto out;
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/* fill the page */
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wait_on_page_writeback(page);
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/* page is wholly or partially inside EOF */
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if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
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unsigned offset;
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offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
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zero_user_segment(page, offset, PAGE_CACHE_SIZE);
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}
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set_page_dirty(page);
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SetPageUptodate(page);
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file_update_time(vma->vm_file);
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out:
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sb_end_pagefault(inode->i_sb);
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return block_page_mkwrite_return(err);
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}
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static const struct vm_operations_struct f2fs_file_vm_ops = {
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.fault = filemap_fault,
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.page_mkwrite = f2fs_vm_page_mkwrite,
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.remap_pages = generic_file_remap_pages,
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};
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int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
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{
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struct inode *inode = file->f_mapping->host;
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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int ret = 0;
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bool need_cp = false;
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struct writeback_control wbc = {
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.sync_mode = WB_SYNC_ALL,
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.nr_to_write = LONG_MAX,
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.for_reclaim = 0,
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};
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if (inode->i_sb->s_flags & MS_RDONLY)
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return 0;
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trace_f2fs_sync_file_enter(inode);
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ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
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if (ret) {
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trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
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return ret;
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}
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/* guarantee free sections for fsync */
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f2fs_balance_fs(sbi);
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mutex_lock(&inode->i_mutex);
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if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
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goto out;
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if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
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need_cp = true;
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else if (is_cp_file(inode))
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need_cp = true;
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else if (!space_for_roll_forward(sbi))
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need_cp = true;
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else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
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need_cp = true;
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if (need_cp) {
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/* all the dirty node pages should be flushed for POR */
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ret = f2fs_sync_fs(inode->i_sb, 1);
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} else {
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/* if there is no written node page, write its inode page */
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while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
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ret = f2fs_write_inode(inode, NULL);
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if (ret)
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goto out;
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}
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filemap_fdatawait_range(sbi->node_inode->i_mapping,
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0, LONG_MAX);
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ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
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}
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out:
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mutex_unlock(&inode->i_mutex);
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trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
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return ret;
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}
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static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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file_accessed(file);
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vma->vm_ops = &f2fs_file_vm_ops;
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return 0;
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}
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static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
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{
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int nr_free = 0, ofs = dn->ofs_in_node;
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struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
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struct f2fs_node *raw_node;
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__le32 *addr;
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raw_node = page_address(dn->node_page);
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addr = blkaddr_in_node(raw_node) + ofs;
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for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
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block_t blkaddr = le32_to_cpu(*addr);
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if (blkaddr == NULL_ADDR)
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continue;
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update_extent_cache(NULL_ADDR, dn);
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invalidate_blocks(sbi, blkaddr);
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dec_valid_block_count(sbi, dn->inode, 1);
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nr_free++;
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}
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if (nr_free) {
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set_page_dirty(dn->node_page);
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sync_inode_page(dn);
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}
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dn->ofs_in_node = ofs;
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trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
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dn->ofs_in_node, nr_free);
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return nr_free;
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}
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void truncate_data_blocks(struct dnode_of_data *dn)
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{
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truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
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}
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static void truncate_partial_data_page(struct inode *inode, u64 from)
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{
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unsigned offset = from & (PAGE_CACHE_SIZE - 1);
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struct page *page;
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if (!offset)
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return;
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page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
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if (IS_ERR(page))
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return;
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lock_page(page);
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if (page->mapping != inode->i_mapping) {
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f2fs_put_page(page, 1);
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return;
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}
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wait_on_page_writeback(page);
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zero_user(page, offset, PAGE_CACHE_SIZE - offset);
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set_page_dirty(page);
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f2fs_put_page(page, 1);
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}
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static int truncate_blocks(struct inode *inode, u64 from)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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unsigned int blocksize = inode->i_sb->s_blocksize;
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struct dnode_of_data dn;
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pgoff_t free_from;
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int count = 0, ilock = -1;
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int err;
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trace_f2fs_truncate_blocks_enter(inode, from);
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free_from = (pgoff_t)
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((from + blocksize - 1) >> (sbi->log_blocksize));
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ilock = mutex_lock_op(sbi);
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
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if (err) {
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if (err == -ENOENT)
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goto free_next;
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mutex_unlock_op(sbi, ilock);
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trace_f2fs_truncate_blocks_exit(inode, err);
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return err;
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}
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if (IS_INODE(dn.node_page))
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count = ADDRS_PER_INODE;
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else
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count = ADDRS_PER_BLOCK;
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count -= dn.ofs_in_node;
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BUG_ON(count < 0);
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if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
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truncate_data_blocks_range(&dn, count);
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free_from += count;
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}
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f2fs_put_dnode(&dn);
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free_next:
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err = truncate_inode_blocks(inode, free_from);
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mutex_unlock_op(sbi, ilock);
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/* lastly zero out the first data page */
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truncate_partial_data_page(inode, from);
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trace_f2fs_truncate_blocks_exit(inode, err);
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return err;
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}
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void f2fs_truncate(struct inode *inode)
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{
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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return;
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trace_f2fs_truncate(inode);
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if (!truncate_blocks(inode, i_size_read(inode))) {
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inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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mark_inode_dirty(inode);
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}
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}
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static int f2fs_getattr(struct vfsmount *mnt,
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struct dentry *dentry, struct kstat *stat)
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{
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struct inode *inode = dentry->d_inode;
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generic_fillattr(inode, stat);
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stat->blocks <<= 3;
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return 0;
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}
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#ifdef CONFIG_F2FS_FS_POSIX_ACL
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static void __setattr_copy(struct inode *inode, const struct iattr *attr)
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{
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struct f2fs_inode_info *fi = F2FS_I(inode);
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unsigned int ia_valid = attr->ia_valid;
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if (ia_valid & ATTR_UID)
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inode->i_uid = attr->ia_uid;
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if (ia_valid & ATTR_GID)
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inode->i_gid = attr->ia_gid;
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if (ia_valid & ATTR_ATIME)
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inode->i_atime = timespec_trunc(attr->ia_atime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_MTIME)
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inode->i_mtime = timespec_trunc(attr->ia_mtime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_CTIME)
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inode->i_ctime = timespec_trunc(attr->ia_ctime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_MODE) {
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umode_t mode = attr->ia_mode;
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if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
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mode &= ~S_ISGID;
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set_acl_inode(fi, mode);
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}
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}
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#else
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#define __setattr_copy setattr_copy
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#endif
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int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = dentry->d_inode;
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struct f2fs_inode_info *fi = F2FS_I(inode);
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int err;
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err = inode_change_ok(inode, attr);
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if (err)
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return err;
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if ((attr->ia_valid & ATTR_SIZE) &&
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attr->ia_size != i_size_read(inode)) {
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truncate_setsize(inode, attr->ia_size);
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f2fs_truncate(inode);
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f2fs_balance_fs(F2FS_SB(inode->i_sb));
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}
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__setattr_copy(inode, attr);
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if (attr->ia_valid & ATTR_MODE) {
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err = f2fs_acl_chmod(inode);
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if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
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inode->i_mode = fi->i_acl_mode;
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clear_inode_flag(fi, FI_ACL_MODE);
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}
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}
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mark_inode_dirty(inode);
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return err;
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}
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const struct inode_operations f2fs_file_inode_operations = {
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.getattr = f2fs_getattr,
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.setattr = f2fs_setattr,
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.get_acl = f2fs_get_acl,
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#ifdef CONFIG_F2FS_FS_XATTR
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.listxattr = f2fs_listxattr,
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.removexattr = generic_removexattr,
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#endif
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};
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static void fill_zero(struct inode *inode, pgoff_t index,
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loff_t start, loff_t len)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct page *page;
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int ilock;
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if (!len)
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return;
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f2fs_balance_fs(sbi);
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ilock = mutex_lock_op(sbi);
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page = get_new_data_page(inode, index, false);
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mutex_unlock_op(sbi, ilock);
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if (!IS_ERR(page)) {
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wait_on_page_writeback(page);
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zero_user(page, start, len);
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set_page_dirty(page);
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f2fs_put_page(page, 1);
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}
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}
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int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
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{
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pgoff_t index;
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int err;
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for (index = pg_start; index < pg_end; index++) {
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struct dnode_of_data dn;
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
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if (err) {
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if (err == -ENOENT)
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continue;
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return err;
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}
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if (dn.data_blkaddr != NULL_ADDR)
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truncate_data_blocks_range(&dn, 1);
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f2fs_put_dnode(&dn);
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}
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return 0;
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}
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static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
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{
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pgoff_t pg_start, pg_end;
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loff_t off_start, off_end;
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int ret = 0;
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pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
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pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
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off_start = offset & (PAGE_CACHE_SIZE - 1);
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off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
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if (pg_start == pg_end) {
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fill_zero(inode, pg_start, off_start,
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off_end - off_start);
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} else {
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if (off_start)
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fill_zero(inode, pg_start++, off_start,
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PAGE_CACHE_SIZE - off_start);
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if (off_end)
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fill_zero(inode, pg_end, 0, off_end);
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|
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if (pg_start < pg_end) {
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struct address_space *mapping = inode->i_mapping;
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loff_t blk_start, blk_end;
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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int ilock;
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f2fs_balance_fs(sbi);
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blk_start = pg_start << PAGE_CACHE_SHIFT;
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blk_end = pg_end << PAGE_CACHE_SHIFT;
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truncate_inode_pages_range(mapping, blk_start,
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blk_end - 1);
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ilock = mutex_lock_op(sbi);
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ret = truncate_hole(inode, pg_start, pg_end);
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mutex_unlock_op(sbi, ilock);
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}
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}
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if (!(mode & FALLOC_FL_KEEP_SIZE) &&
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i_size_read(inode) <= (offset + len)) {
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i_size_write(inode, offset);
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mark_inode_dirty(inode);
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}
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return ret;
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}
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|
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static int expand_inode_data(struct inode *inode, loff_t offset,
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loff_t len, int mode)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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pgoff_t index, pg_start, pg_end;
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loff_t new_size = i_size_read(inode);
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loff_t off_start, off_end;
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int ret = 0;
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ret = inode_newsize_ok(inode, (len + offset));
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if (ret)
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return ret;
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|
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pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
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pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
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off_start = offset & (PAGE_CACHE_SIZE - 1);
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off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
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|
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for (index = pg_start; index <= pg_end; index++) {
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struct dnode_of_data dn;
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int ilock;
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|
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ilock = mutex_lock_op(sbi);
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
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if (ret) {
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mutex_unlock_op(sbi, ilock);
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break;
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|
}
|
|
|
|
if (dn.data_blkaddr == NULL_ADDR) {
|
|
ret = reserve_new_block(&dn);
|
|
if (ret) {
|
|
f2fs_put_dnode(&dn);
|
|
mutex_unlock_op(sbi, ilock);
|
|
break;
|
|
}
|
|
}
|
|
f2fs_put_dnode(&dn);
|
|
mutex_unlock_op(sbi, ilock);
|
|
|
|
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_inode(file);
|
|
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);
|
|
|
|
if (!ret) {
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
trace_f2fs_fallocate(inode, mode, offset, len, ret);
|
|
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 = file_inode(filp);
|
|
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_file(filp);
|
|
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_file(filp);
|
|
return ret;
|
|
}
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case F2FS_IOC32_GETFLAGS:
|
|
cmd = F2FS_IOC_GETFLAGS;
|
|
break;
|
|
case F2FS_IOC32_SETFLAGS:
|
|
cmd = F2FS_IOC_SETFLAGS;
|
|
break;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
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,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = f2fs_compat_ioctl,
|
|
#endif
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
};
|