657 lines
17 KiB
C
657 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*/
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#include <linux/init.h>
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#include <linux/buffer_head.h>
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#include <linux/mpage.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/time.h>
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#include <linux/writeback.h>
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#include <linux/uio.h>
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#include <linux/random.h>
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#include <linux/iversion.h>
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#include "exfat_raw.h"
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#include "exfat_fs.h"
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static int __exfat_write_inode(struct inode *inode, int sync)
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{
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unsigned long long on_disk_size;
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struct exfat_dentry *ep, *ep2;
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struct exfat_entry_set_cache *es = NULL;
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struct super_block *sb = inode->i_sb;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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struct exfat_inode_info *ei = EXFAT_I(inode);
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bool is_dir = (ei->type == TYPE_DIR) ? true : false;
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if (inode->i_ino == EXFAT_ROOT_INO)
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return 0;
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/*
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* If the indode is already unlinked, there is no need for updating it.
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*/
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if (ei->dir.dir == DIR_DELETED)
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return 0;
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if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
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return 0;
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exfat_set_volume_dirty(sb);
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/* get the directory entry of given file or directory */
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es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES);
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if (!es)
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return -EIO;
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ep = exfat_get_dentry_cached(es, 0);
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ep2 = exfat_get_dentry_cached(es, 1);
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ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
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/* set FILE_INFO structure using the acquired struct exfat_dentry */
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exfat_set_entry_time(sbi, &ei->i_crtime,
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&ep->dentry.file.create_tz,
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&ep->dentry.file.create_time,
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&ep->dentry.file.create_date,
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&ep->dentry.file.create_time_cs);
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exfat_set_entry_time(sbi, &inode->i_mtime,
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&ep->dentry.file.modify_tz,
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&ep->dentry.file.modify_time,
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&ep->dentry.file.modify_date,
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&ep->dentry.file.modify_time_cs);
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exfat_set_entry_time(sbi, &inode->i_atime,
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&ep->dentry.file.access_tz,
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&ep->dentry.file.access_time,
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&ep->dentry.file.access_date,
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NULL);
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/* File size should be zero if there is no cluster allocated */
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on_disk_size = i_size_read(inode);
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if (ei->start_clu == EXFAT_EOF_CLUSTER)
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on_disk_size = 0;
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ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
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ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
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exfat_update_dir_chksum_with_entry_set(es);
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return exfat_free_dentry_set(es, sync);
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}
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int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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int ret;
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mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
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ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
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mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
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return ret;
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}
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void exfat_sync_inode(struct inode *inode)
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{
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lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
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__exfat_write_inode(inode, 1);
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}
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/*
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* Input: inode, (logical) clu_offset, target allocation area
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* Output: errcode, cluster number
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* *clu = (~0), if it's unable to allocate a new cluster
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*/
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static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
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unsigned int *clu, int create)
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{
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int ret, modified = false;
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unsigned int last_clu;
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struct exfat_chain new_clu;
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struct super_block *sb = inode->i_sb;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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struct exfat_inode_info *ei = EXFAT_I(inode);
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unsigned int local_clu_offset = clu_offset;
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unsigned int num_to_be_allocated = 0, num_clusters = 0;
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if (ei->i_size_ondisk > 0)
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num_clusters =
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EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
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if (clu_offset >= num_clusters)
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num_to_be_allocated = clu_offset - num_clusters + 1;
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if (!create && (num_to_be_allocated > 0)) {
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*clu = EXFAT_EOF_CLUSTER;
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return 0;
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}
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*clu = last_clu = ei->start_clu;
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if (ei->flags == ALLOC_NO_FAT_CHAIN) {
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if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
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last_clu += clu_offset - 1;
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if (clu_offset == num_clusters)
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*clu = EXFAT_EOF_CLUSTER;
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else
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*clu += clu_offset;
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}
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} else if (ei->type == TYPE_FILE) {
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unsigned int fclus = 0;
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int err = exfat_get_cluster(inode, clu_offset,
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&fclus, clu, &last_clu, 1);
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if (err)
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return -EIO;
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clu_offset -= fclus;
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} else {
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/* hint information */
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if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
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ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
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clu_offset -= ei->hint_bmap.off;
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/* hint_bmap.clu should be valid */
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WARN_ON(ei->hint_bmap.clu < 2);
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*clu = ei->hint_bmap.clu;
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}
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while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
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last_clu = *clu;
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if (exfat_get_next_cluster(sb, clu))
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return -EIO;
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clu_offset--;
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}
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}
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if (*clu == EXFAT_EOF_CLUSTER) {
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exfat_set_volume_dirty(sb);
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new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
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EXFAT_EOF_CLUSTER : last_clu + 1;
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new_clu.size = 0;
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new_clu.flags = ei->flags;
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/* allocate a cluster */
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if (num_to_be_allocated < 1) {
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/* Broken FAT (i_sze > allocated FAT) */
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exfat_fs_error(sb, "broken FAT chain.");
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return -EIO;
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}
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ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
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inode_needs_sync(inode));
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if (ret)
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return ret;
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if (new_clu.dir == EXFAT_EOF_CLUSTER ||
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new_clu.dir == EXFAT_FREE_CLUSTER) {
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exfat_fs_error(sb,
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"bogus cluster new allocated (last_clu : %u, new_clu : %u)",
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last_clu, new_clu.dir);
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return -EIO;
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}
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/* append to the FAT chain */
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if (last_clu == EXFAT_EOF_CLUSTER) {
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if (new_clu.flags == ALLOC_FAT_CHAIN)
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ei->flags = ALLOC_FAT_CHAIN;
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ei->start_clu = new_clu.dir;
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modified = true;
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} else {
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if (new_clu.flags != ei->flags) {
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/* no-fat-chain bit is disabled,
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* so fat-chain should be synced with
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* alloc-bitmap
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*/
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exfat_chain_cont_cluster(sb, ei->start_clu,
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num_clusters);
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ei->flags = ALLOC_FAT_CHAIN;
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modified = true;
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}
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if (new_clu.flags == ALLOC_FAT_CHAIN)
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if (exfat_ent_set(sb, last_clu, new_clu.dir))
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return -EIO;
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}
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num_clusters += num_to_be_allocated;
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*clu = new_clu.dir;
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if (ei->dir.dir != DIR_DELETED && modified) {
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struct exfat_dentry *ep;
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struct exfat_entry_set_cache *es;
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int err;
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es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
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ES_ALL_ENTRIES);
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if (!es)
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return -EIO;
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/* get stream entry */
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ep = exfat_get_dentry_cached(es, 1);
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/* update directory entry */
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ep->dentry.stream.flags = ei->flags;
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ep->dentry.stream.start_clu =
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cpu_to_le32(ei->start_clu);
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ep->dentry.stream.valid_size =
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cpu_to_le64(i_size_read(inode));
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ep->dentry.stream.size =
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ep->dentry.stream.valid_size;
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exfat_update_dir_chksum_with_entry_set(es);
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err = exfat_free_dentry_set(es, inode_needs_sync(inode));
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if (err)
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return err;
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} /* end of if != DIR_DELETED */
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inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
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/*
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* Move *clu pointer along FAT chains (hole care) because the
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* caller of this function expect *clu to be the last cluster.
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* This only works when num_to_be_allocated >= 2,
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* *clu = (the first cluster of the allocated chain) =>
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* (the last cluster of ...)
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*/
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if (ei->flags == ALLOC_NO_FAT_CHAIN) {
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*clu += num_to_be_allocated - 1;
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} else {
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while (num_to_be_allocated > 1) {
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if (exfat_get_next_cluster(sb, clu))
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return -EIO;
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num_to_be_allocated--;
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}
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}
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}
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/* hint information */
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ei->hint_bmap.off = local_clu_offset;
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ei->hint_bmap.clu = *clu;
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return 0;
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}
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static int exfat_map_new_buffer(struct exfat_inode_info *ei,
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struct buffer_head *bh, loff_t pos)
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{
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if (buffer_delay(bh) && pos > ei->i_size_aligned)
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return -EIO;
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set_buffer_new(bh);
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/*
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* Adjust i_size_aligned if i_size_ondisk is bigger than it.
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*/
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if (ei->i_size_ondisk > ei->i_size_aligned)
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ei->i_size_aligned = ei->i_size_ondisk;
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return 0;
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}
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static int exfat_get_block(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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{
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struct exfat_inode_info *ei = EXFAT_I(inode);
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struct super_block *sb = inode->i_sb;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
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int err = 0;
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unsigned long mapped_blocks = 0;
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unsigned int cluster, sec_offset;
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sector_t last_block;
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sector_t phys = 0;
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loff_t pos;
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mutex_lock(&sbi->s_lock);
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last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
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if (iblock >= last_block && !create)
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goto done;
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/* Is this block already allocated? */
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err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
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&cluster, create);
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if (err) {
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if (err != -ENOSPC)
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exfat_fs_error_ratelimit(sb,
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"failed to bmap (inode : %p iblock : %llu, err : %d)",
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inode, (unsigned long long)iblock, err);
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goto unlock_ret;
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}
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if (cluster == EXFAT_EOF_CLUSTER)
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goto done;
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/* sector offset in cluster */
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sec_offset = iblock & (sbi->sect_per_clus - 1);
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phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
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mapped_blocks = sbi->sect_per_clus - sec_offset;
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max_blocks = min(mapped_blocks, max_blocks);
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/* Treat newly added block / cluster */
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if (iblock < last_block)
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create = 0;
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if (create || buffer_delay(bh_result)) {
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pos = EXFAT_BLK_TO_B((iblock + 1), sb);
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if (ei->i_size_ondisk < pos)
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ei->i_size_ondisk = pos;
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}
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if (create) {
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err = exfat_map_new_buffer(ei, bh_result, pos);
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if (err) {
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exfat_fs_error(sb,
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"requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
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pos, ei->i_size_aligned);
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goto unlock_ret;
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}
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}
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if (buffer_delay(bh_result))
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clear_buffer_delay(bh_result);
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map_bh(bh_result, sb, phys);
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done:
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bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
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unlock_ret:
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mutex_unlock(&sbi->s_lock);
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return err;
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}
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static int exfat_readpage(struct file *file, struct page *page)
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{
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return mpage_readpage(page, exfat_get_block);
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}
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static void exfat_readahead(struct readahead_control *rac)
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{
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mpage_readahead(rac, exfat_get_block);
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}
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static int exfat_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page, exfat_get_block, wbc);
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}
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static int exfat_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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return mpage_writepages(mapping, wbc, exfat_get_block);
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}
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static void exfat_write_failed(struct address_space *mapping, loff_t to)
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{
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struct inode *inode = mapping->host;
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if (to > i_size_read(inode)) {
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truncate_pagecache(inode, i_size_read(inode));
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exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
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}
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}
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static int exfat_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned int len, unsigned int flags,
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struct page **pagep, void **fsdata)
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{
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int ret;
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*pagep = NULL;
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ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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exfat_get_block,
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&EXFAT_I(mapping->host)->i_size_ondisk);
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if (ret < 0)
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exfat_write_failed(mapping, pos+len);
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return ret;
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}
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static int exfat_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned int len, unsigned int copied,
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struct page *pagep, void *fsdata)
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{
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struct inode *inode = mapping->host;
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struct exfat_inode_info *ei = EXFAT_I(inode);
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int err;
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err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
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if (ei->i_size_aligned < i_size_read(inode)) {
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exfat_fs_error(inode->i_sb,
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"invalid size(size(%llu) > aligned(%llu)\n",
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i_size_read(inode), ei->i_size_aligned);
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return -EIO;
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}
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if (err < len)
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exfat_write_failed(mapping, pos+len);
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if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
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inode->i_mtime = inode->i_ctime = current_time(inode);
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ei->attr |= ATTR_ARCHIVE;
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mark_inode_dirty(inode);
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}
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return err;
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}
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static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct address_space *mapping = iocb->ki_filp->f_mapping;
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struct inode *inode = mapping->host;
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loff_t size = iocb->ki_pos + iov_iter_count(iter);
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int rw = iov_iter_rw(iter);
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ssize_t ret;
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if (rw == WRITE) {
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/*
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* FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
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* so we need to update the ->i_size_aligned to block boundary.
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*
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* But we must fill the remaining area or hole by nul for
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* updating ->i_size_aligned
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*
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* Return 0, and fallback to normal buffered write.
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*/
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if (EXFAT_I(inode)->i_size_aligned < size)
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return 0;
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}
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/*
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* Need to use the DIO_LOCKING for avoiding the race
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* condition of exfat_get_block() and ->truncate().
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*/
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ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
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if (ret < 0 && (rw & WRITE))
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exfat_write_failed(mapping, size);
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return ret;
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}
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static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
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{
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sector_t blocknr;
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/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
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down_read(&EXFAT_I(mapping->host)->truncate_lock);
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blocknr = generic_block_bmap(mapping, block, exfat_get_block);
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up_read(&EXFAT_I(mapping->host)->truncate_lock);
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return blocknr;
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}
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/*
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* exfat_block_truncate_page() zeroes out a mapping from file offset `from'
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* up to the end of the block which corresponds to `from'.
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* This is required during truncate to physically zeroout the tail end
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* of that block so it doesn't yield old data if the file is later grown.
|
|
* Also, avoid causing failure from fsx for cases of "data past EOF"
|
|
*/
|
|
int exfat_block_truncate_page(struct inode *inode, loff_t from)
|
|
{
|
|
return block_truncate_page(inode->i_mapping, from, exfat_get_block);
|
|
}
|
|
|
|
static const struct address_space_operations exfat_aops = {
|
|
.set_page_dirty = __set_page_dirty_buffers,
|
|
.readpage = exfat_readpage,
|
|
.readahead = exfat_readahead,
|
|
.writepage = exfat_writepage,
|
|
.writepages = exfat_writepages,
|
|
.write_begin = exfat_write_begin,
|
|
.write_end = exfat_write_end,
|
|
.direct_IO = exfat_direct_IO,
|
|
.bmap = exfat_aop_bmap
|
|
};
|
|
|
|
static inline unsigned long exfat_hash(loff_t i_pos)
|
|
{
|
|
return hash_32(i_pos, EXFAT_HASH_BITS);
|
|
}
|
|
|
|
void exfat_hash_inode(struct inode *inode, loff_t i_pos)
|
|
{
|
|
struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
|
|
struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
|
|
|
|
spin_lock(&sbi->inode_hash_lock);
|
|
EXFAT_I(inode)->i_pos = i_pos;
|
|
hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
|
|
spin_unlock(&sbi->inode_hash_lock);
|
|
}
|
|
|
|
void exfat_unhash_inode(struct inode *inode)
|
|
{
|
|
struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
|
|
|
|
spin_lock(&sbi->inode_hash_lock);
|
|
hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
|
|
EXFAT_I(inode)->i_pos = 0;
|
|
spin_unlock(&sbi->inode_hash_lock);
|
|
}
|
|
|
|
struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
|
|
{
|
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
|
struct exfat_inode_info *info;
|
|
struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
|
|
struct inode *inode = NULL;
|
|
|
|
spin_lock(&sbi->inode_hash_lock);
|
|
hlist_for_each_entry(info, head, i_hash_fat) {
|
|
WARN_ON(info->vfs_inode.i_sb != sb);
|
|
|
|
if (i_pos != info->i_pos)
|
|
continue;
|
|
inode = igrab(&info->vfs_inode);
|
|
if (inode)
|
|
break;
|
|
}
|
|
spin_unlock(&sbi->inode_hash_lock);
|
|
return inode;
|
|
}
|
|
|
|
/* doesn't deal with root inode */
|
|
static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
|
|
{
|
|
struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
|
|
struct exfat_inode_info *ei = EXFAT_I(inode);
|
|
loff_t size = info->size;
|
|
|
|
ei->dir = info->dir;
|
|
ei->entry = info->entry;
|
|
ei->attr = info->attr;
|
|
ei->start_clu = info->start_clu;
|
|
ei->flags = info->flags;
|
|
ei->type = info->type;
|
|
|
|
ei->version = 0;
|
|
ei->hint_stat.eidx = 0;
|
|
ei->hint_stat.clu = info->start_clu;
|
|
ei->hint_femp.eidx = EXFAT_HINT_NONE;
|
|
ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
|
|
ei->i_pos = 0;
|
|
|
|
inode->i_uid = sbi->options.fs_uid;
|
|
inode->i_gid = sbi->options.fs_gid;
|
|
inode_inc_iversion(inode);
|
|
inode->i_generation = prandom_u32();
|
|
|
|
if (info->attr & ATTR_SUBDIR) { /* directory */
|
|
inode->i_generation &= ~1;
|
|
inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
|
|
inode->i_op = &exfat_dir_inode_operations;
|
|
inode->i_fop = &exfat_dir_operations;
|
|
set_nlink(inode, info->num_subdirs);
|
|
} else { /* regular file */
|
|
inode->i_generation |= 1;
|
|
inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
|
|
inode->i_op = &exfat_file_inode_operations;
|
|
inode->i_fop = &exfat_file_operations;
|
|
inode->i_mapping->a_ops = &exfat_aops;
|
|
inode->i_mapping->nrpages = 0;
|
|
}
|
|
|
|
i_size_write(inode, size);
|
|
|
|
/* ondisk and aligned size should be aligned with block size */
|
|
if (size & (inode->i_sb->s_blocksize - 1)) {
|
|
size |= (inode->i_sb->s_blocksize - 1);
|
|
size++;
|
|
}
|
|
|
|
ei->i_size_aligned = size;
|
|
ei->i_size_ondisk = size;
|
|
|
|
exfat_save_attr(inode, info->attr);
|
|
|
|
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
|
|
inode->i_mtime = info->mtime;
|
|
inode->i_ctime = info->mtime;
|
|
ei->i_crtime = info->crtime;
|
|
inode->i_atime = info->atime;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct inode *exfat_build_inode(struct super_block *sb,
|
|
struct exfat_dir_entry *info, loff_t i_pos)
|
|
{
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
inode = exfat_iget(sb, i_pos);
|
|
if (inode)
|
|
goto out;
|
|
inode = new_inode(sb);
|
|
if (!inode) {
|
|
inode = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
|
|
inode_set_iversion(inode, 1);
|
|
err = exfat_fill_inode(inode, info);
|
|
if (err) {
|
|
iput(inode);
|
|
inode = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
exfat_hash_inode(inode, i_pos);
|
|
insert_inode_hash(inode);
|
|
out:
|
|
return inode;
|
|
}
|
|
|
|
void exfat_evict_inode(struct inode *inode)
|
|
{
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
|
|
if (!inode->i_nlink) {
|
|
i_size_write(inode, 0);
|
|
mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
|
|
__exfat_truncate(inode, 0);
|
|
mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
|
|
}
|
|
|
|
invalidate_inode_buffers(inode);
|
|
clear_inode(inode);
|
|
exfat_cache_inval_inode(inode);
|
|
exfat_unhash_inode(inode);
|
|
}
|