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    Subject[PATCH v10 03/14] exfat: add inode operations
    Date
    This adds the implementation of inode operations for exfat.

    Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
    Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>
    ---
    fs/exfat/inode.c | 667 +++++++++++++++++++++
    fs/exfat/namei.c | 1442 ++++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 2109 insertions(+)
    create mode 100644 fs/exfat/inode.c
    create mode 100644 fs/exfat/namei.c

    diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
    new file mode 100644
    index 000000000000..56cf09db1920
    --- /dev/null
    +++ b/fs/exfat/inode.c
    @@ -0,0 +1,667 @@
    +// SPDX-License-Identifier: GPL-2.0-or-later
    +/*
    + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
    + */
    +
    +#include <linux/init.h>
    +#include <linux/buffer_head.h>
    +#include <linux/mpage.h>
    +#include <linux/bio.h>
    +#include <linux/blkdev.h>
    +#include <linux/time.h>
    +#include <linux/writeback.h>
    +#include <linux/uio.h>
    +#include <linux/random.h>
    +#include <linux/iversion.h>
    +
    +#include "exfat_raw.h"
    +#include "exfat_fs.h"
    +
    +static int __exfat_write_inode(struct inode *inode, int sync)
    +{
    + int ret = -EIO;
    + unsigned long long on_disk_size;
    + struct exfat_dentry *ep, *ep2;
    + struct exfat_entry_set_cache *es = NULL;
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + bool is_dir = (ei->type == TYPE_DIR) ? true : false;
    +
    + if (inode->i_ino == EXFAT_ROOT_INO)
    + return 0;
    +
    + /*
    + * If the indode is already unlinked, there is no need for updating it.
    + */
    + if (ei->dir.dir == DIR_DELETED)
    + return 0;
    +
    + if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
    + return 0;
    +
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    +
    + /* get the directory entry of given file or directory */
    + es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES,
    + &ep);
    + if (!es)
    + return -EIO;
    + ep2 = ep + 1;
    +
    + ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
    +
    + /* set FILE_INFO structure using the acquired struct exfat_dentry */
    + exfat_set_entry_time(sbi, &inode->i_ctime,
    + &ep->dentry.file.create_time,
    + &ep->dentry.file.create_date,
    + &ep->dentry.file.create_tz);
    + exfat_set_entry_time(sbi, &inode->i_mtime,
    + &ep->dentry.file.modify_time,
    + &ep->dentry.file.modify_date,
    + &ep->dentry.file.modify_tz);
    + exfat_set_entry_time(sbi, &inode->i_atime,
    + &ep->dentry.file.access_time,
    + &ep->dentry.file.access_date,
    + &ep->dentry.file.access_tz);
    +
    + /* File size should be zero if there is no cluster allocated */
    + on_disk_size = i_size_read(inode);
    +
    + if (ei->start_clu == EXFAT_EOF_CLUSTER)
    + on_disk_size = 0;
    +
    + ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
    + ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
    +
    + ret = exfat_update_dir_chksum_with_entry_set(sb, es, sync);
    + kfree(es);
    + return ret;
    +}
    +
    +int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
    +{
    + int ret;
    +
    + mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
    + ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
    + mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
    +
    + return ret;
    +}
    +
    +void exfat_sync_inode(struct inode *inode)
    +{
    + lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
    + __exfat_write_inode(inode, 1);
    +}
    +
    +/*
    + * Input: inode, (logical) clu_offset, target allocation area
    + * Output: errcode, cluster number
    + * *clu = (~0), if it's unable to allocate a new cluster
    + */
    +static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
    + unsigned int *clu, int create)
    +{
    + int ret, modified = false;
    + unsigned int last_clu;
    + struct exfat_chain new_clu;
    + struct exfat_dentry *ep;
    + struct exfat_entry_set_cache *es = NULL;
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + unsigned int local_clu_offset = clu_offset;
    + unsigned int num_to_be_allocated = 0, num_clusters = 0;
    +
    + ei->rwoffset = EXFAT_CLU_TO_B(clu_offset, sbi);
    +
    + if (EXFAT_I(inode)->i_size_ondisk > 0)
    + num_clusters =
    + EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk,
    + sbi);
    +
    + if (clu_offset >= num_clusters)
    + num_to_be_allocated = clu_offset - num_clusters + 1;
    +
    + if (!create && (num_to_be_allocated > 0)) {
    + *clu = EXFAT_EOF_CLUSTER;
    + return 0;
    + }
    +
    + *clu = last_clu = ei->start_clu;
    +
    + if (ei->flags == ALLOC_NO_FAT_CHAIN) {
    + if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
    + last_clu += clu_offset - 1;
    +
    + if (clu_offset == num_clusters)
    + *clu = EXFAT_EOF_CLUSTER;
    + else
    + *clu += clu_offset;
    + }
    + } else if (ei->type == TYPE_FILE) {
    + unsigned int fclus = 0;
    + int err = exfat_get_cluster(inode, clu_offset,
    + &fclus, clu, &last_clu, 1);
    + if (err)
    + return -EIO;
    +
    + clu_offset -= fclus;
    + } else {
    + /* hint information */
    + if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
    + ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
    + clu_offset -= ei->hint_bmap.off;
    + /* hint_bmap.clu should be valid */
    + WARN_ON(ei->hint_bmap.clu < 2);
    + *clu = ei->hint_bmap.clu;
    + }
    +
    + while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
    + last_clu = *clu;
    + if (exfat_get_next_cluster(sb, clu))
    + return -EIO;
    + clu_offset--;
    + }
    + }
    +
    + if (*clu == EXFAT_EOF_CLUSTER) {
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    +
    + new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
    + EXFAT_EOF_CLUSTER : last_clu + 1;
    + new_clu.size = 0;
    + new_clu.flags = ei->flags;
    +
    + /* allocate a cluster */
    + if (num_to_be_allocated < 1) {
    + /* Broken FAT (i_sze > allocated FAT) */
    + exfat_fs_error(sb, "broken FAT chain.");
    + return -EIO;
    + }
    +
    + ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu);
    + if (ret)
    + return ret;
    +
    + if (new_clu.dir == EXFAT_EOF_CLUSTER ||
    + new_clu.dir == EXFAT_FREE_CLUSTER) {
    + exfat_fs_error(sb,
    + "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
    + last_clu, new_clu.dir);
    + return -EIO;
    + }
    +
    + /* append to the FAT chain */
    + if (last_clu == EXFAT_EOF_CLUSTER) {
    + if (new_clu.flags == ALLOC_FAT_CHAIN)
    + ei->flags = ALLOC_FAT_CHAIN;
    + ei->start_clu = new_clu.dir;
    + modified = true;
    + } else {
    + if (new_clu.flags != ei->flags) {
    + /* no-fat-chain bit is disabled,
    + * so fat-chain should be synced with
    + * alloc-bitmap
    + */
    + exfat_chain_cont_cluster(sb, ei->start_clu,
    + num_clusters);
    + ei->flags = ALLOC_FAT_CHAIN;
    + modified = true;
    + }
    + if (new_clu.flags == ALLOC_FAT_CHAIN)
    + if (exfat_ent_set(sb, last_clu, new_clu.dir))
    + return -EIO;
    + }
    +
    + num_clusters += num_to_be_allocated;
    + *clu = new_clu.dir;
    +
    + if (ei->dir.dir != DIR_DELETED) {
    + es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
    + ES_ALL_ENTRIES, &ep);
    + if (!es)
    + return -EIO;
    + /* get stream entry */
    + ep++;
    +
    + /* update directory entry */
    + if (modified) {
    + if (ep->dentry.stream.flags != ei->flags)
    + ep->dentry.stream.flags = ei->flags;
    +
    + if (le32_to_cpu(ep->dentry.stream.start_clu) !=
    + ei->start_clu)
    + ep->dentry.stream.start_clu =
    + cpu_to_le32(ei->start_clu);
    +
    + ep->dentry.stream.valid_size =
    + cpu_to_le64(i_size_read(inode));
    + ep->dentry.stream.size =
    + ep->dentry.stream.valid_size;
    + }
    +
    + if (exfat_update_dir_chksum_with_entry_set(sb, es,
    + inode_needs_sync(inode)))
    + return -EIO;
    + kfree(es);
    +
    + } /* end of if != DIR_DELETED */
    +
    + inode->i_blocks +=
    + num_to_be_allocated << sbi->sect_per_clus_bits;
    +
    + /*
    + * Move *clu pointer along FAT chains (hole care) because the
    + * caller of this function expect *clu to be the last cluster.
    + * This only works when num_to_be_allocated >= 2,
    + * *clu = (the first cluster of the allocated chain) =>
    + * (the last cluster of ...)
    + */
    + if (ei->flags == ALLOC_NO_FAT_CHAIN) {
    + *clu += num_to_be_allocated - 1;
    + } else {
    + while (num_to_be_allocated > 1) {
    + if (exfat_get_next_cluster(sb, clu))
    + return -EIO;
    + num_to_be_allocated--;
    + }
    + }
    +
    + }
    +
    + /* hint information */
    + ei->hint_bmap.off = local_clu_offset;
    + ei->hint_bmap.clu = *clu;
    +
    + return 0;
    +}
    +
    +static int exfat_map_new_buffer(struct exfat_inode_info *ei,
    + struct buffer_head *bh, loff_t pos)
    +{
    + if (buffer_delay(bh) && pos > ei->i_size_aligned)
    + return -EIO;
    + set_buffer_new(bh);
    +
    + /*
    + * Adjust i_size_aligned if i_size_ondisk is bigger than it.
    + */
    + if (ei->i_size_ondisk > ei->i_size_aligned)
    + ei->i_size_aligned = ei->i_size_ondisk;
    + return 0;
    +}
    +
    +static int exfat_get_block(struct inode *inode, sector_t iblock,
    + struct buffer_head *bh_result, int create)
    +{
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
    + int err = 0;
    + unsigned long mapped_blocks = 0;
    + unsigned int cluster, sec_offset;
    + sector_t last_block;
    + sector_t phys = 0;
    + loff_t pos;
    +
    + mutex_lock(&sbi->s_lock);
    + last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
    + if (iblock >= last_block && !create)
    + goto done;
    +
    + /* Is this block already allocated? */
    + err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
    + &cluster, create);
    + if (err) {
    + if (err != -ENOSPC)
    + exfat_fs_error_ratelimit(sb,
    + "failed to bmap (inode : %p iblock : %llu, err : %d)",
    + inode, (unsigned long long)iblock, err);
    + goto unlock_ret;
    + }
    +
    + if (cluster == EXFAT_EOF_CLUSTER)
    + goto done;
    +
    + /* sector offset in cluster */
    + sec_offset = iblock & (sbi->sect_per_clus - 1);
    +
    + phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
    + mapped_blocks = sbi->sect_per_clus - sec_offset;
    + max_blocks = min(mapped_blocks, max_blocks);
    +
    + /* Treat newly added block / cluster */
    + if (iblock < last_block)
    + create = 0;
    +
    + if (create || buffer_delay(bh_result)) {
    + pos = EXFAT_BLK_TO_B((iblock + 1), sb);
    + if (ei->i_size_ondisk < pos)
    + ei->i_size_ondisk = pos;
    + }
    +
    + if (create) {
    + err = exfat_map_new_buffer(ei, bh_result, pos);
    + if (err) {
    + exfat_fs_error(sb,
    + "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
    + pos, ei->i_size_aligned);
    + goto unlock_ret;
    + }
    + }
    +
    + if (buffer_delay(bh_result))
    + clear_buffer_delay(bh_result);
    + map_bh(bh_result, sb, phys);
    +done:
    + bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
    +unlock_ret:
    + mutex_unlock(&sbi->s_lock);
    + return err;
    +}
    +
    +static int exfat_readpage(struct file *file, struct page *page)
    +{
    + return mpage_readpage(page, exfat_get_block);
    +}
    +
    +static int exfat_readpages(struct file *file, struct address_space *mapping,
    + struct list_head *pages, unsigned int nr_pages)
    +{
    + return mpage_readpages(mapping, pages, nr_pages, exfat_get_block);
    +}
    +
    +static int exfat_writepage(struct page *page, struct writeback_control *wbc)
    +{
    + return block_write_full_page(page, exfat_get_block, wbc);
    +}
    +
    +static int exfat_writepages(struct address_space *mapping,
    + struct writeback_control *wbc)
    +{
    + return mpage_writepages(mapping, wbc, exfat_get_block);
    +}
    +
    +static void exfat_write_failed(struct address_space *mapping, loff_t to)
    +{
    + struct inode *inode = mapping->host;
    +
    + if (to > i_size_read(inode)) {
    + truncate_pagecache(inode, i_size_read(inode));
    + exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
    + }
    +}
    +
    +static int exfat_write_begin(struct file *file, struct address_space *mapping,
    + loff_t pos, unsigned int len, unsigned int flags,
    + struct page **pagep, void **fsdata)
    +{
    + int ret;
    +
    + *pagep = NULL;
    + ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
    + exfat_get_block,
    + &EXFAT_I(mapping->host)->i_size_ondisk);
    +
    + if (ret < 0)
    + exfat_write_failed(mapping, pos+len);
    +
    + return ret;
    +}
    +
    +static int exfat_write_end(struct file *file, struct address_space *mapping,
    + loff_t pos, unsigned int len, unsigned int copied,
    + struct page *pagep, void *fsdata)
    +{
    + struct inode *inode = mapping->host;
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + int err;
    +
    + err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
    +
    + if (EXFAT_I(inode)->i_size_aligned < i_size_read(inode)) {
    + exfat_fs_error(inode->i_sb,
    + "invalid size(size(%llu) > aligned(%llu)\n",
    + i_size_read(inode), EXFAT_I(inode)->i_size_aligned);
    + return -EIO;
    + }
    +
    + if (err < len)
    + exfat_write_failed(mapping, pos+len);
    +
    + if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
    + inode->i_mtime = inode->i_ctime = current_time(inode);
    + ei->attr |= ATTR_ARCHIVE;
    + mark_inode_dirty(inode);
    + }
    +
    + return err;
    +}
    +
    +static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
    +{
    + struct address_space *mapping = iocb->ki_filp->f_mapping;
    + struct inode *inode = mapping->host;
    + loff_t size = iocb->ki_pos + iov_iter_count(iter);
    + int rw = iov_iter_rw(iter);
    + ssize_t ret;
    +
    + if (rw == WRITE) {
    + /*
    + * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
    + * so we need to update the ->i_size_aligned to block boundary.
    + *
    + * But we must fill the remaining area or hole by nul for
    + * updating ->i_size_aligned
    + *
    + * Return 0, and fallback to normal buffered write.
    + */
    + if (EXFAT_I(inode)->i_size_aligned < size)
    + return 0;
    + }
    +
    + /*
    + * Need to use the DIO_LOCKING for avoiding the race
    + * condition of exfat_get_block() and ->truncate().
    + */
    + ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
    + if (ret < 0 && (rw & WRITE))
    + exfat_write_failed(mapping, size);
    + return ret;
    +}
    +
    +static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
    +{
    + sector_t blocknr;
    +
    + /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
    + down_read(&EXFAT_I(mapping->host)->truncate_lock);
    + blocknr = generic_block_bmap(mapping, block, exfat_get_block);
    + up_read(&EXFAT_I(mapping->host)->truncate_lock);
    + return blocknr;
    +}
    +
    +/*
    + * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
    + * up to the end of the block which corresponds to `from'.
    + * This is required during truncate to physically zeroout the tail end
    + * 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 = {
    + .readpage = exfat_readpage,
    + .readpages = exfat_readpages,
    + .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;
    +
    + memcpy(&ei->dir, &info->dir, sizeof(struct exfat_chain));
    + 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->rwoffset = 0;
    + 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 = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
    + ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
    + inode->i_mtime = info->mtime;
    + inode->i_ctime = info->ctime;
    + inode->i_atime = info->atime;
    +
    + exfat_cache_init_inode(inode);
    +
    + 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);
    +}
    diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
    new file mode 100644
    index 000000000000..7298de74e9b8
    --- /dev/null
    +++ b/fs/exfat/namei.c
    @@ -0,0 +1,1442 @@
    +// SPDX-License-Identifier: GPL-2.0-or-later
    +/*
    + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
    + */
    +
    +#include <linux/iversion.h>
    +#include <linux/namei.h>
    +#include <linux/slab.h>
    +#include <linux/buffer_head.h>
    +#include <linux/nls.h>
    +
    +#include "exfat_raw.h"
    +#include "exfat_fs.h"
    +
    +static inline unsigned long exfat_d_version(struct dentry *dentry)
    +{
    + return (unsigned long) dentry->d_fsdata;
    +}
    +
    +static inline void exfat_d_version_set(struct dentry *dentry,
    + unsigned long version)
    +{
    + dentry->d_fsdata = (void *) version;
    +}
    +
    +/*
    + * If new entry was created in the parent, it could create the 8.3 alias (the
    + * shortname of logname). So, the parent may have the negative-dentry which
    + * matches the created 8.3 alias.
    + *
    + * If it happened, the negative dentry isn't actually negative anymore. So,
    + * drop it.
    + */
    +static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
    +{
    + int ret;
    +
    + if (flags & LOOKUP_RCU)
    + return -ECHILD;
    +
    + /*
    + * This is not negative dentry. Always valid.
    + *
    + * Note, rename() to existing directory entry will have ->d_inode, and
    + * will use existing name which isn't specified name by user.
    + *
    + * We may be able to drop this positive dentry here. But dropping
    + * positive dentry isn't good idea. So it's unsupported like
    + * rename("filename", "FILENAME") for now.
    + */
    + if (d_really_is_positive(dentry))
    + return 1;
    +
    + /*
    + * Drop the negative dentry, in order to make sure to use the case
    + * sensitive name which is specified by user if this is for creation.
    + */
    + if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
    + return 0;
    +
    + spin_lock(&dentry->d_lock);
    + ret = inode_eq_iversion(d_inode(dentry->d_parent),
    + exfat_d_version(dentry));
    + spin_unlock(&dentry->d_lock);
    + return ret;
    +}
    +
    +/* returns the length of a struct qstr, ignoring trailing dots */
    +static unsigned int exfat_striptail_len(unsigned int len, const char *name)
    +{
    + while (len && name[len - 1] == '.')
    + len--;
    + return len;
    +}
    +
    +/*
    + * Compute the hash for the exfat name corresponding to the dentry. If the name
    + * is invalid, we leave the hash code unchanged so that the existing dentry can
    + * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
    + */
    +static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
    +{
    + struct super_block *sb = dentry->d_sb;
    + struct nls_table *t = EXFAT_SB(sb)->nls_io;
    + const unsigned char *name = qstr->name;
    + unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
    + unsigned long hash = init_name_hash(dentry);
    + int i, charlen;
    + wchar_t c;
    +
    + for (i = 0; i < len; i += charlen) {
    + charlen = t->char2uni(&name[i], len - i, &c);
    + if (charlen < 0)
    + return charlen;
    + hash = partial_name_hash(exfat_toupper(sb, c), hash);
    + }
    +
    + qstr->hash = end_name_hash(hash);
    + return 0;
    +}
    +
    +static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
    + const char *str, const struct qstr *name)
    +{
    + struct super_block *sb = dentry->d_sb;
    + struct nls_table *t = EXFAT_SB(sb)->nls_io;
    + unsigned int alen = exfat_striptail_len(name->len, name->name);
    + unsigned int blen = exfat_striptail_len(len, str);
    + wchar_t c1, c2;
    + int charlen, i;
    +
    + if (alen != blen)
    + return 1;
    +
    + for (i = 0; i < len; i += charlen) {
    + charlen = t->char2uni(&name->name[i], alen - i, &c1);
    + if (charlen < 0)
    + return 1;
    + if (charlen != t->char2uni(&str[i], blen - i, &c2))
    + return 1;
    +
    + if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
    + return 1;
    + }
    +
    + return 0;
    +}
    +
    +const struct dentry_operations exfat_dentry_ops = {
    + .d_revalidate = exfat_d_revalidate,
    + .d_hash = exfat_d_hash,
    + .d_compare = exfat_d_cmp,
    +};
    +
    +static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
    +{
    + struct super_block *sb = dentry->d_sb;
    + const unsigned char *name = qstr->name;
    + unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
    + unsigned long hash = init_name_hash(dentry);
    + int i, charlen;
    + unicode_t u;
    +
    + for (i = 0; i < len; i += charlen) {
    + charlen = utf8_to_utf32(&name[i], len - i, &u);
    + if (charlen < 0)
    + return charlen;
    +
    + /*
    + * Convert to UTF-16: code points above U+FFFF are encoded as
    + * surrogate pairs.
    + * exfat_toupper() works only for code points up to the U+FFFF.
    + */
    + if (u > 0xFFFF) {
    + hash = partial_name_hash(exfat_high_surrogate(u), hash);
    + hash = partial_name_hash(exfat_low_surrogate(u), hash);
    + } else {
    + hash = partial_name_hash(exfat_toupper(sb, u), hash);
    + }
    + }
    +
    + qstr->hash = end_name_hash(hash);
    + return 0;
    +}
    +
    +static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
    + const char *str, const struct qstr *name)
    +{
    + struct super_block *sb = dentry->d_sb;
    + unsigned int alen = exfat_striptail_len(name->len, name->name);
    + unsigned int blen = exfat_striptail_len(len, str);
    + unicode_t u_a, u_b;
    + int charlen, i;
    +
    + if (alen != blen)
    + return 1;
    +
    + for (i = 0; i < alen; i += charlen) {
    + charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
    + if (charlen < 0)
    + return 1;
    + if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
    + return 1;
    +
    + if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
    + if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
    + return 1;
    + } else if (u_a > 0xFFFF && u_b > 0xFFFF) {
    + if (exfat_low_surrogate(u_a) !=
    + exfat_low_surrogate(u_b) ||
    + exfat_high_surrogate(u_a) !=
    + exfat_high_surrogate(u_b))
    + return 1;
    + } else {
    + return 1;
    + }
    + }
    +
    + return 0;
    +}
    +
    +const struct dentry_operations exfat_utf8_dentry_ops = {
    + .d_revalidate = exfat_d_revalidate,
    + .d_hash = exfat_utf8_d_hash,
    + .d_compare = exfat_utf8_d_cmp,
    +};
    +
    +/* used only in search empty_slot() */
    +#define CNT_UNUSED_NOHIT (-1)
    +#define CNT_UNUSED_HIT (-2)
    +/* search EMPTY CONTINUOUS "num_entries" entries */
    +static int exfat_search_empty_slot(struct super_block *sb,
    + struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
    + int num_entries)
    +{
    + int i, dentry, num_empty = 0;
    + int dentries_per_clu;
    + unsigned int type;
    + struct exfat_chain clu;
    + struct exfat_dentry *ep;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct buffer_head *bh;
    +
    + dentries_per_clu = sbi->dentries_per_clu;
    +
    + if (hint_femp->eidx != EXFAT_HINT_NONE) {
    + dentry = hint_femp->eidx;
    + if (num_entries <= hint_femp->count) {
    + hint_femp->eidx = EXFAT_HINT_NONE;
    + return dentry;
    + }
    +
    + exfat_chain_dup(&clu, &hint_femp->cur);
    + } else {
    + exfat_chain_dup(&clu, p_dir);
    + dentry = 0;
    + }
    +
    + while (clu.dir != EXFAT_EOF_CLUSTER) {
    + i = dentry & (dentries_per_clu - 1);
    +
    + for (; i < dentries_per_clu; i++, dentry++) {
    + ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
    + if (!ep)
    + return -EIO;
    + type = exfat_get_entry_type(ep);
    + brelse(bh);
    +
    + if (type == TYPE_UNUSED || type == TYPE_DELETED) {
    + num_empty++;
    + if (hint_femp->eidx == EXFAT_HINT_NONE) {
    + hint_femp->eidx = dentry;
    + hint_femp->count = CNT_UNUSED_NOHIT;
    + exfat_chain_set(&hint_femp->cur,
    + clu.dir, clu.size, clu.flags);
    + }
    +
    + if (type == TYPE_UNUSED &&
    + hint_femp->count != CNT_UNUSED_HIT)
    + hint_femp->count = CNT_UNUSED_HIT;
    + } else {
    + if (hint_femp->eidx != EXFAT_HINT_NONE &&
    + hint_femp->count == CNT_UNUSED_HIT) {
    + /* unused empty group means
    + * an empty group which includes
    + * unused dentry
    + */
    + exfat_fs_error(sb,
    + "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
    + dentry, hint_femp->eidx,
    + p_dir->dir, clu.dir);
    + return -EIO;
    + }
    +
    + num_empty = 0;
    + hint_femp->eidx = EXFAT_HINT_NONE;
    + }
    +
    + if (num_empty >= num_entries) {
    + /* found and invalidate hint_femp */
    + hint_femp->eidx = EXFAT_HINT_NONE;
    + return (dentry - (num_entries - 1));
    + }
    + }
    +
    + if (clu.flags == ALLOC_NO_FAT_CHAIN) {
    + if (--clu.size > 0)
    + clu.dir++;
    + else
    + clu.dir = EXFAT_EOF_CLUSTER;
    + } else {
    + if (exfat_get_next_cluster(sb, &clu.dir))
    + return -EIO;
    + }
    + }
    +
    + return -ENOSPC;
    +}
    +
    +static int exfat_check_max_dentries(struct inode *inode)
    +{
    + if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
    + /*
    + * exFAT spec allows a dir to grow upto 8388608(256MB)
    + * dentries
    + */
    + return -ENOSPC;
    + }
    + return 0;
    +}
    +
    +/* find empty directory entry.
    + * if there isn't any empty slot, expand cluster chain.
    + */
    +static int exfat_find_empty_entry(struct inode *inode,
    + struct exfat_chain *p_dir, int num_entries)
    +{
    + int dentry;
    + unsigned int ret, last_clu;
    + sector_t sector;
    + loff_t size = 0;
    + struct exfat_chain clu;
    + struct exfat_dentry *ep = NULL;
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + struct exfat_hint_femp hint_femp;
    +
    + hint_femp.eidx = EXFAT_HINT_NONE;
    +
    + if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
    + memcpy(&hint_femp, &ei->hint_femp,
    + sizeof(struct exfat_hint_femp));
    + ei->hint_femp.eidx = EXFAT_HINT_NONE;
    + }
    +
    + while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
    + num_entries)) < 0) {
    + if (dentry == -EIO)
    + break;
    +
    + if (exfat_check_max_dentries(inode))
    + return -ENOSPC;
    +
    + /* we trust p_dir->size regardless of FAT type */
    + if (exfat_find_last_cluster(sb, p_dir, &last_clu))
    + return -EIO;
    +
    + /*
    + * Allocate new cluster to this directory
    + */
    + exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
    +
    + /* allocate a cluster */
    + ret = exfat_alloc_cluster(inode, 1, &clu);
    + if (ret)
    + return ret;
    +
    + if (exfat_zeroed_cluster(inode, clu.dir))
    + return -EIO;
    +
    + /* append to the FAT chain */
    + if (clu.flags != p_dir->flags) {
    + /* no-fat-chain bit is disabled,
    + * so fat-chain should be synced with alloc-bitmap
    + */
    + exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
    + p_dir->flags = ALLOC_FAT_CHAIN;
    + hint_femp.cur.flags = ALLOC_FAT_CHAIN;
    + }
    +
    + if (clu.flags == ALLOC_FAT_CHAIN)
    + if (exfat_ent_set(sb, last_clu, clu.dir))
    + return -EIO;
    +
    + if (hint_femp.eidx == EXFAT_HINT_NONE) {
    + /* the special case that new dentry
    + * should be allocated from the start of new cluster
    + */
    + hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
    + hint_femp.count = sbi->dentries_per_clu;
    +
    + exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
    + }
    + hint_femp.cur.size++;
    + p_dir->size++;
    + size = EXFAT_CLU_TO_B(p_dir->size, sbi);
    +
    + /* update the directory entry */
    + if (p_dir->dir != sbi->root_dir) {
    + struct buffer_head *bh;
    +
    + ep = exfat_get_dentry(sb,
    + &(ei->dir), ei->entry + 1, &bh, &sector);
    + if (!ep)
    + return -EIO;
    +
    + ep->dentry.stream.valid_size = cpu_to_le64(size);
    + ep->dentry.stream.size = ep->dentry.stream.valid_size;
    + ep->dentry.stream.flags = p_dir->flags;
    + exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
    + brelse(bh);
    + if (exfat_update_dir_chksum(inode, &(ei->dir),
    + ei->entry))
    + return -EIO;
    + }
    +
    + /* directory inode should be updated in here */
    + i_size_write(inode, size);
    + EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
    + EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
    + EXFAT_I(inode)->flags = p_dir->flags;
    + inode->i_blocks += 1 << sbi->sect_per_clus_bits;
    + }
    +
    + return dentry;
    +}
    +
    +/*
    + * Name Resolution Functions :
    + * Zero if it was successful; otherwise nonzero.
    + */
    +static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
    + struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
    + int lookup)
    +{
    + int namelen;
    + int lossy = NLS_NAME_NO_LOSSY;
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    +
    + /* strip all trailing periods */
    + namelen = exfat_striptail_len(strlen(path), path);
    + if (!namelen)
    + return -ENOENT;
    +
    + if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
    + return -ENAMETOOLONG;
    +
    + /*
    + * strip all leading spaces :
    + * "MS windows 7" supports leading spaces.
    + * So we should skip this preprocessing for compatibility.
    + */
    +
    + /* file name conversion :
    + * If lookup case, we allow bad-name for compatibility.
    + */
    + namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
    + &lossy);
    + if (namelen < 0)
    + return namelen; /* return error value */
    +
    + if ((lossy && !lookup) || !namelen)
    + return -EINVAL;
    +
    + exfat_chain_set(p_dir, ei->start_clu,
    + EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
    +
    + return 0;
    +}
    +
    +static inline int exfat_resolve_path(struct inode *inode,
    + const unsigned char *path, struct exfat_chain *dir,
    + struct exfat_uni_name *uni)
    +{
    + return __exfat_resolve_path(inode, path, dir, uni, 0);
    +}
    +
    +static inline int exfat_resolve_path_for_lookup(struct inode *inode,
    + const unsigned char *path, struct exfat_chain *dir,
    + struct exfat_uni_name *uni)
    +{
    + return __exfat_resolve_path(inode, path, dir, uni, 1);
    +}
    +
    +static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
    +{
    + return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
    +}
    +
    +static int exfat_add_entry(struct inode *inode, const char *path,
    + struct exfat_chain *p_dir, unsigned int type,
    + struct exfat_dir_entry *info)
    +{
    + int ret, dentry, num_entries;
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_uni_name uniname;
    + struct exfat_chain clu;
    + int clu_size = 0;
    + unsigned int start_clu = EXFAT_FREE_CLUSTER;
    +
    + ret = exfat_resolve_path(inode, path, p_dir, &uniname);
    + if (ret)
    + goto out;
    +
    + num_entries = exfat_calc_num_entries(&uniname);
    + if (num_entries < 0) {
    + ret = num_entries;
    + goto out;
    + }
    +
    + /* exfat_find_empty_entry must be called before alloc_cluster() */
    + dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
    + if (dentry < 0) {
    + ret = dentry; /* -EIO or -ENOSPC */
    + goto out;
    + }
    +
    + if (type == TYPE_DIR) {
    + ret = exfat_alloc_new_dir(inode, &clu);
    + if (ret)
    + goto out;
    + start_clu = clu.dir;
    + clu_size = sbi->cluster_size;
    + }
    +
    + /* update the directory entry */
    + /* fill the dos name directory entry information of the created file.
    + * the first cluster is not determined yet. (0)
    + */
    + ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
    + start_clu, clu_size);
    + if (ret)
    + goto out;
    +
    + ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
    + if (ret)
    + goto out;
    +
    + memcpy(&info->dir, p_dir, sizeof(struct exfat_chain));
    + info->entry = dentry;
    + info->flags = ALLOC_NO_FAT_CHAIN;
    + info->type = type;
    +
    + if (type == TYPE_FILE) {
    + info->attr = ATTR_ARCHIVE;
    + info->start_clu = EXFAT_EOF_CLUSTER;
    + info->size = 0;
    + info->num_subdirs = 0;
    + } else {
    + int count;
    + struct exfat_chain cdir;
    +
    + info->attr = ATTR_SUBDIR;
    + info->start_clu = start_clu;
    + info->size = clu_size;
    +
    + exfat_chain_set(&cdir, info->start_clu,
    + EXFAT_B_TO_CLU(info->size, sbi), info->flags);
    + count = exfat_count_dir_entries(sb, &cdir);
    + if (count < 0)
    + return -EIO;
    + info->num_subdirs = count + EXFAT_MIN_SUBDIR;
    + }
    + memset(&info->ctime, 0, sizeof(info->ctime));
    + memset(&info->mtime, 0, sizeof(info->mtime));
    + memset(&info->atime, 0, sizeof(info->atime));
    +out:
    + return ret;
    +}
    +
    +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
    + bool excl)
    +{
    + struct super_block *sb = dir->i_sb;
    + struct inode *inode;
    + struct exfat_chain cdir;
    + struct exfat_dir_entry info;
    + loff_t i_pos;
    + int err;
    +
    + mutex_lock(&EXFAT_SB(sb)->s_lock);
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    + err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
    + &info);
    + exfat_set_vol_flags(sb, VOL_CLEAN);
    + if (err)
    + goto unlock;
    +
    + inode_inc_iversion(dir);
    + dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir);
    + if (IS_DIRSYNC(dir))
    + exfat_sync_inode(dir);
    + else
    + mark_inode_dirty(dir);
    +
    + i_pos = exfat_make_i_pos(&info);
    + inode = exfat_build_inode(sb, &info, i_pos);
    + if (IS_ERR(inode))
    + goto unlock;
    +
    + inode_inc_iversion(inode);
    + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
    + /* timestamp is already written, so mark_inode_dirty() is unneeded. */
    +
    + d_instantiate(dentry, inode);
    +unlock:
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + return err;
    +}
    +
    +/* lookup a file */
    +static int exfat_find(struct inode *dir, struct qstr *qname,
    + struct exfat_dir_entry *info)
    +{
    + int ret, dentry, num_entries, count;
    + struct exfat_chain cdir;
    + struct exfat_uni_name uni_name;
    + struct exfat_dentry *ep, *ep2;
    + struct exfat_entry_set_cache *es = NULL;
    + struct super_block *sb = dir->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_inode_info *ei = EXFAT_I(dir);
    +
    + if (qname->len == 0)
    + return -ENOENT;
    +
    + /* check the validity of directory name in the given pathname */
    + ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
    + if (ret)
    + return ret;
    +
    + num_entries = exfat_calc_num_entries(&uni_name);
    + if (num_entries < 0)
    + return num_entries;
    +
    + /* check the validation of hint_stat and initialize it if required */
    + if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
    + ei->hint_stat.clu = cdir.dir;
    + ei->hint_stat.eidx = 0;
    + ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
    + ei->hint_femp.eidx = EXFAT_HINT_NONE;
    + }
    +
    + /* search the file name for directories */
    + dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
    + num_entries, TYPE_ALL);
    +
    + if ((dentry < 0) && (dentry != -EEXIST))
    + return dentry; /* -error value */
    +
    + memcpy(&info->dir, &cdir.dir, sizeof(struct exfat_chain));
    + info->entry = dentry;
    + info->num_subdirs = 0;
    +
    + /* root directory itself */
    + if (unlikely(dentry == -EEXIST)) {
    + int num_clu = 0;
    +
    + info->type = TYPE_DIR;
    + info->attr = ATTR_SUBDIR;
    + info->flags = ALLOC_FAT_CHAIN;
    + info->start_clu = sbi->root_dir;
    + memset(&info->ctime, 0, sizeof(info->ctime));
    + memset(&info->mtime, 0, sizeof(info->mtime));
    + memset(&info->atime, 0, sizeof(info->atime));
    +
    + exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
    + if (exfat_count_num_clusters(sb, &cdir, &num_clu))
    + return -EIO;
    + info->size = num_clu << sbi->cluster_size_bits;
    +
    + count = exfat_count_dir_entries(sb, &cdir);
    + if (count < 0)
    + return -EIO;
    +
    + info->num_subdirs = count;
    + } else {
    + es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES, &ep);
    + if (!es)
    + return -EIO;
    + ep2 = ep + 1;
    +
    + info->type = exfat_get_entry_type(ep);
    + info->attr = le16_to_cpu(ep->dentry.file.attr);
    + info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
    + if ((info->type == TYPE_FILE) && (info->size == 0)) {
    + info->flags = ALLOC_NO_FAT_CHAIN;
    + info->start_clu = EXFAT_EOF_CLUSTER;
    + } else {
    + info->flags = ep2->dentry.stream.flags;
    + info->start_clu =
    + le32_to_cpu(ep2->dentry.stream.start_clu);
    + }
    +
    + if (ei->start_clu == EXFAT_FREE_CLUSTER) {
    + exfat_fs_error(sb,
    + "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
    + i_size_read(dir), ei->dir.dir, ei->entry);
    + return -EIO;
    + }
    +
    + exfat_get_entry_time(sbi, &info->ctime,
    + ep->dentry.file.create_time,
    + ep->dentry.file.create_date,
    + ep->dentry.file.create_tz);
    + exfat_get_entry_time(sbi, &info->mtime,
    + ep->dentry.file.modify_time,
    + ep->dentry.file.modify_date,
    + ep->dentry.file.modify_tz);
    + exfat_get_entry_time(sbi, &info->atime,
    + ep->dentry.file.access_time,
    + ep->dentry.file.access_date,
    + ep->dentry.file.access_tz);
    + kfree(es);
    +
    + if (info->type == TYPE_DIR) {
    + exfat_chain_set(&cdir, info->start_clu,
    + EXFAT_B_TO_CLU(info->size, sbi), info->flags);
    + count = exfat_count_dir_entries(sb, &cdir);
    + if (count < 0)
    + return -EIO;
    +
    + info->num_subdirs = count + EXFAT_MIN_SUBDIR;
    + }
    + }
    + return 0;
    +}
    +
    +static int exfat_d_anon_disconn(struct dentry *dentry)
    +{
    + return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
    +}
    +
    +static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
    + unsigned int flags)
    +{
    + struct super_block *sb = dir->i_sb;
    + struct inode *inode;
    + struct dentry *alias;
    + struct exfat_dir_entry info;
    + int err;
    + loff_t i_pos;
    + mode_t i_mode;
    +
    + mutex_lock(&EXFAT_SB(sb)->s_lock);
    + err = exfat_find(dir, &dentry->d_name, &info);
    + if (err) {
    + if (err == -ENOENT) {
    + inode = NULL;
    + goto out;
    + }
    + goto unlock;
    + }
    +
    + i_pos = exfat_make_i_pos(&info);
    + inode = exfat_build_inode(sb, &info, i_pos);
    + if (IS_ERR(inode)) {
    + err = PTR_ERR(inode);
    + goto unlock;
    + }
    +
    + i_mode = inode->i_mode;
    + alias = d_find_alias(inode);
    +
    + /*
    + * Checking "alias->d_parent == dentry->d_parent" to make sure
    + * FS is not corrupted (especially double linked dir).
    + */
    + if (alias && alias->d_parent == dentry->d_parent &&
    + !exfat_d_anon_disconn(alias)) {
    +
    + /*
    + * Unhashed alias is able to exist because of revalidate()
    + * called by lookup_fast. You can easily make this status
    + * by calling create and lookup concurrently
    + * In such case, we reuse an alias instead of new dentry
    + */
    + if (d_unhashed(alias)) {
    + WARN_ON(alias->d_name.hash_len !=
    + dentry->d_name.hash_len);
    + exfat_msg(sb, KERN_INFO,
    + "rehashed a dentry(%p) in read lookup", alias);
    + d_drop(dentry);
    + d_rehash(alias);
    + } else if (!S_ISDIR(i_mode)) {
    + /*
    + * This inode has non anonymous-DCACHE_DISCONNECTED
    + * dentry. This means, the user did ->lookup() by an
    + * another name (longname vs 8.3 alias of it) in past.
    + *
    + * Switch to new one for reason of locality if possible.
    + */
    + d_move(alias, dentry);
    + }
    + iput(inode);
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + return alias;
    + }
    + dput(alias);
    +out:
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + if (!inode)
    + exfat_d_version_set(dentry, inode_query_iversion(dir));
    +
    + return d_splice_alias(inode, dentry);
    +unlock:
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + return ERR_PTR(err);
    +}
    +
    +/* remove an entry, BUT don't truncate */
    +static int exfat_unlink(struct inode *dir, struct dentry *dentry)
    +{
    + struct exfat_chain cdir;
    + struct exfat_dentry *ep;
    + struct super_block *sb = dir->i_sb;
    + struct inode *inode = dentry->d_inode;
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + struct buffer_head *bh;
    + sector_t sector;
    + int num_entries, entry, err = 0;
    +
    + mutex_lock(&EXFAT_SB(sb)->s_lock);
    + exfat_chain_dup(&cdir, &ei->dir);
    + entry = ei->entry;
    + if (ei->dir.dir == DIR_DELETED) {
    + exfat_msg(sb, KERN_ERR, "abnormal access to deleted dentry");
    + err = -ENOENT;
    + goto unlock;
    + }
    +
    + ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
    + if (!ep) {
    + err = -EIO;
    + goto unlock;
    + }
    + num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
    + if (num_entries < 0) {
    + err = -EIO;
    + brelse(bh);
    + goto unlock;
    + }
    + num_entries++;
    + brelse(bh);
    +
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    + /* update the directory entry */
    + if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
    + err = -EIO;
    + goto unlock;
    + }
    +
    + /* This doesn't modify ei */
    + ei->dir.dir = DIR_DELETED;
    + exfat_set_vol_flags(sb, VOL_CLEAN);
    +
    + inode_inc_iversion(dir);
    + dir->i_mtime = dir->i_atime = current_time(dir);
    + if (IS_DIRSYNC(dir))
    + exfat_sync_inode(dir);
    + else
    + mark_inode_dirty(dir);
    +
    + clear_nlink(inode);
    + inode->i_mtime = inode->i_atime = current_time(inode);
    + exfat_unhash_inode(inode);
    + exfat_d_version_set(dentry, inode_query_iversion(dir));
    +unlock:
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + return err;
    +}
    +
    +static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
    +{
    + struct super_block *sb = dir->i_sb;
    + struct inode *inode;
    + struct exfat_dir_entry info;
    + struct exfat_chain cdir;
    + loff_t i_pos;
    + int err;
    +
    + mutex_lock(&EXFAT_SB(sb)->s_lock);
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    + err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
    + &info);
    + exfat_set_vol_flags(sb, VOL_CLEAN);
    + if (err)
    + goto unlock;
    +
    + inode_inc_iversion(dir);
    + dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir);
    + if (IS_DIRSYNC(dir))
    + exfat_sync_inode(dir);
    + else
    + mark_inode_dirty(dir);
    + inc_nlink(dir);
    +
    + i_pos = exfat_make_i_pos(&info);
    + inode = exfat_build_inode(sb, &info, i_pos);
    + if (IS_ERR(inode)) {
    + err = PTR_ERR(inode);
    + goto unlock;
    + }
    +
    + inode_inc_iversion(inode);
    + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
    + /* timestamp is already written, so mark_inode_dirty() is unneeded. */
    +
    + d_instantiate(dentry, inode);
    +
    +unlock:
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + return err;
    +}
    +
    +static int exfat_check_dir_empty(struct super_block *sb,
    + struct exfat_chain *p_dir)
    +{
    + int i, dentries_per_clu;
    + unsigned int type;
    + struct exfat_chain clu;
    + struct exfat_dentry *ep;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct buffer_head *bh;
    +
    + dentries_per_clu = sbi->dentries_per_clu;
    +
    + exfat_chain_dup(&clu, p_dir);
    +
    + while (clu.dir != EXFAT_EOF_CLUSTER) {
    + for (i = 0; i < dentries_per_clu; i++) {
    + ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
    + if (!ep)
    + return -EIO;
    + type = exfat_get_entry_type(ep);
    + brelse(bh);
    + if (type == TYPE_UNUSED)
    + return 0;
    +
    + if (type != TYPE_FILE && type != TYPE_DIR)
    + continue;
    +
    + return -ENOTEMPTY;
    + }
    +
    + if (clu.flags == ALLOC_NO_FAT_CHAIN) {
    + if (--clu.size > 0)
    + clu.dir++;
    + else
    + clu.dir = EXFAT_EOF_CLUSTER;
    + } else {
    + if (exfat_get_next_cluster(sb, &(clu.dir)))
    + return -EIO;
    + }
    + }
    +
    + return 0;
    +}
    +
    +static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
    +{
    + struct inode *inode = dentry->d_inode;
    + struct exfat_dentry *ep;
    + struct exfat_chain cdir, clu_to_free;
    + struct super_block *sb = inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + struct exfat_inode_info *ei = EXFAT_I(inode);
    + struct buffer_head *bh;
    + sector_t sector;
    + int num_entries, entry, err;
    +
    + mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
    +
    + exfat_chain_dup(&cdir, &ei->dir);
    + entry = ei->entry;
    +
    + if (ei->dir.dir == DIR_DELETED) {
    + exfat_msg(sb, KERN_ERR, "abnormal access to deleted dentry");
    + err = -ENOENT;
    + goto unlock;
    + }
    +
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    + exfat_chain_set(&clu_to_free, ei->start_clu,
    + EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
    +
    + err = exfat_check_dir_empty(sb, &clu_to_free);
    + if (err) {
    + if (err == -EIO)
    + exfat_msg(sb, KERN_ERR,
    + "failed to exfat_check_dir_empty : err(%d)",
    + err);
    + goto unlock;
    + }
    +
    + ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
    + if (!ep) {
    + err = -EIO;
    + goto unlock;
    + }
    +
    + num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
    + if (num_entries < 0) {
    + err = -EIO;
    + brelse(bh);
    + goto unlock;
    + }
    + num_entries++;
    + brelse(bh);
    +
    + err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
    + if (err) {
    + exfat_msg(sb, KERN_ERR,
    + "failed to exfat_remove_entries : err(%d)",
    + err);
    + goto unlock;
    + }
    + ei->dir.dir = DIR_DELETED;
    + exfat_set_vol_flags(sb, VOL_CLEAN);
    +
    + inode_inc_iversion(dir);
    + dir->i_mtime = dir->i_atime = current_time(dir);
    + if (IS_DIRSYNC(dir))
    + exfat_sync_inode(dir);
    + else
    + mark_inode_dirty(dir);
    + drop_nlink(dir);
    +
    + clear_nlink(inode);
    + inode->i_mtime = inode->i_atime = current_time(inode);
    + exfat_unhash_inode(inode);
    + exfat_d_version_set(dentry, inode_query_iversion(dir));
    +unlock:
    + mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
    + return err;
    +}
    +
    +static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
    + int oldentry, struct exfat_uni_name *p_uniname,
    + struct exfat_inode_info *ei)
    +{
    + int ret, num_old_entries, num_new_entries;
    + sector_t sector_old, sector_new;
    + struct exfat_dentry *epold, *epnew;
    + struct super_block *sb = inode->i_sb;
    + struct buffer_head *new_bh, *old_bh;
    + int sync = IS_DIRSYNC(inode);
    +
    + epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, &sector_old);
    + if (!epold)
    + return -EIO;
    +
    + num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
    + if (num_old_entries < 0)
    + return -EIO;
    + num_old_entries++;
    +
    + num_new_entries = exfat_calc_num_entries(p_uniname);
    + if (num_new_entries < 0)
    + return num_new_entries;
    +
    + if (num_old_entries < num_new_entries) {
    + int newentry;
    +
    + newentry =
    + exfat_find_empty_entry(inode, p_dir, num_new_entries);
    + if (newentry < 0)
    + return newentry; /* -EIO or -ENOSPC */
    +
    + epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh,
    + &sector_new);
    + if (!epnew)
    + return -EIO;
    +
    + memcpy(epnew, epold, DENTRY_SIZE);
    + if (exfat_get_entry_type(epnew) == TYPE_FILE) {
    + epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
    + ei->attr |= ATTR_ARCHIVE;
    + }
    + exfat_update_bh(sb, new_bh, sync);
    + brelse(old_bh);
    + brelse(new_bh);
    +
    + epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
    + &sector_old);
    + epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
    + &sector_new);
    + if (!epold || !epnew)
    + return -EIO;
    +
    + memcpy(epnew, epold, DENTRY_SIZE);
    + exfat_update_bh(sb, new_bh, sync);
    + brelse(old_bh);
    + brelse(new_bh);
    +
    + ret = exfat_init_ext_entry(inode, p_dir, newentry,
    + num_new_entries, p_uniname);
    + if (ret)
    + return ret;
    +
    + exfat_remove_entries(inode, p_dir, oldentry, 0,
    + num_old_entries);
    + ei->entry = newentry;
    + } else {
    + if (exfat_get_entry_type(epold) == TYPE_FILE) {
    + epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
    + ei->attr |= ATTR_ARCHIVE;
    + }
    + exfat_update_bh(sb, old_bh, sync);
    + brelse(old_bh);
    + ret = exfat_init_ext_entry(inode, p_dir, oldentry,
    + num_new_entries, p_uniname);
    + if (ret)
    + return ret;
    +
    + exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
    + num_old_entries);
    + }
    + return 0;
    +}
    +
    +static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
    + int oldentry, struct exfat_chain *p_newdir,
    + struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
    +{
    + int ret, newentry, num_new_entries, num_old_entries;
    + sector_t sector_mov, sector_new;
    + struct exfat_dentry *epmov, *epnew;
    + struct super_block *sb = inode->i_sb;
    + struct buffer_head *mov_bh, *new_bh;
    +
    + epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, &sector_mov);
    + if (!epmov)
    + return -EIO;
    +
    + /* check if the source and target directory is the same */
    + if (exfat_get_entry_type(epmov) == TYPE_DIR &&
    + le32_to_cpu(epmov->dentry.stream.start_clu) == p_newdir->dir)
    + return -EINVAL;
    +
    + num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
    + epmov);
    + if (num_old_entries < 0)
    + return -EIO;
    + num_old_entries++;
    +
    + num_new_entries = exfat_calc_num_entries(p_uniname);
    + if (num_new_entries < 0)
    + return num_new_entries;
    +
    + newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
    + if (newentry < 0)
    + return newentry; /* -EIO or -ENOSPC */
    +
    + epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, &sector_new);
    + if (!epnew)
    + return -EIO;
    +
    + memcpy(epnew, epmov, DENTRY_SIZE);
    + if (exfat_get_entry_type(epnew) == TYPE_FILE) {
    + epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
    + ei->attr |= ATTR_ARCHIVE;
    + }
    + exfat_update_bh(sb, new_bh, IS_DIRSYNC(inode));
    + brelse(mov_bh);
    + brelse(new_bh);
    +
    + epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
    + &sector_mov);
    + epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
    + &sector_new);
    + if (!epmov || !epnew)
    + return -EIO;
    +
    + memcpy(epnew, epmov, DENTRY_SIZE);
    + exfat_update_bh(sb, new_bh, IS_DIRSYNC(inode));
    + brelse(mov_bh);
    + brelse(new_bh);
    +
    + ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
    + p_uniname);
    + if (ret)
    + return ret;
    +
    + exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
    +
    + exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
    + p_newdir->flags);
    +
    + ei->entry = newentry;
    + return 0;
    +}
    +
    +static void exfat_update_parent_info(struct exfat_inode_info *ei,
    + struct inode *parent_inode)
    +{
    + struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
    + struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
    + loff_t parent_isize = i_size_read(parent_inode);
    +
    + /*
    + * the problem that struct exfat_inode_info caches wrong parent info.
    + *
    + * because of flag-mismatch of ei->dir,
    + * there is abnormal traversing cluster chain.
    + */
    + if (unlikely(parent_ei->flags != ei->dir.flags ||
    + parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
    + parent_ei->start_clu != ei->dir.dir)) {
    + exfat_chain_set(&ei->dir, parent_ei->start_clu,
    + EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
    + parent_ei->flags);
    + }
    +}
    +
    +/* rename or move a old file into a new file */
    +static int __exfat_rename(struct inode *old_parent_inode,
    + struct exfat_inode_info *ei, struct inode *new_parent_inode,
    + struct dentry *new_dentry)
    +{
    + int ret;
    + int dentry;
    + struct exfat_chain olddir, newdir;
    + struct exfat_chain *p_dir = NULL;
    + struct exfat_uni_name uni_name;
    + struct exfat_dentry *ep;
    + struct super_block *sb = old_parent_inode->i_sb;
    + struct exfat_sb_info *sbi = EXFAT_SB(sb);
    + const unsigned char *new_path = new_dentry->d_name.name;
    + struct inode *new_inode = new_dentry->d_inode;
    + int num_entries;
    + struct exfat_inode_info *new_ei = NULL;
    + unsigned int new_entry_type = TYPE_UNUSED;
    + int new_entry = 0;
    + struct buffer_head *old_bh, *new_bh = NULL;
    +
    + /* check the validity of pointer parameters */
    + if (new_path == NULL || strlen(new_path) == 0)
    + return -EINVAL;
    +
    + if (ei->dir.dir == DIR_DELETED) {
    + exfat_msg(sb, KERN_ERR,
    + "abnormal access to deleted source dentry");
    + return -ENOENT;
    + }
    +
    + exfat_update_parent_info(ei, old_parent_inode);
    +
    + exfat_chain_dup(&olddir, &ei->dir);
    + dentry = ei->entry;
    +
    + ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
    + if (!ep) {
    + ret = -EIO;
    + goto out;
    + }
    + brelse(old_bh);
    +
    + /* check whether new dir is existing directory and empty */
    + if (new_inode) {
    + ret = -EIO;
    + new_ei = EXFAT_I(new_inode);
    +
    + if (new_ei->dir.dir == DIR_DELETED) {
    + exfat_msg(sb, KERN_ERR,
    + "abnormal access to deleted target dentry");
    + goto out;
    + }
    +
    + exfat_update_parent_info(new_ei, new_parent_inode);
    +
    + p_dir = &(new_ei->dir);
    + new_entry = new_ei->entry;
    + ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
    + if (!ep)
    + goto out;
    +
    + new_entry_type = exfat_get_entry_type(ep);
    + brelse(new_bh);
    +
    + /* if new_inode exists, update ei */
    + if (new_entry_type == TYPE_DIR) {
    + struct exfat_chain new_clu;
    +
    + new_clu.dir = new_ei->start_clu;
    + new_clu.size =
    + EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
    + sbi);
    + new_clu.flags = new_ei->flags;
    +
    + ret = exfat_check_dir_empty(sb, &new_clu);
    + if (ret)
    + goto out;
    + }
    + }
    +
    + /* check the validity of directory name in the given new pathname */
    + ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
    + &uni_name);
    + if (ret)
    + goto out;
    +
    + exfat_set_vol_flags(sb, VOL_DIRTY);
    +
    + if (olddir.dir == newdir.dir)
    + ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
    + &uni_name, ei);
    + else
    + ret = exfat_move_file(new_parent_inode, &olddir, dentry,
    + &newdir, &uni_name, ei);
    +
    + if (!ret && new_inode) {
    + /* delete entries of new_dir */
    + ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
    + if (!ep) {
    + ret = -EIO;
    + goto del_out;
    + }
    +
    + num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
    + if (num_entries < 0) {
    + ret = -EIO;
    + goto del_out;
    + }
    + brelse(new_bh);
    +
    + if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
    + num_entries + 1)) {
    + ret = -EIO;
    + goto del_out;
    + }
    +
    + /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
    + if (new_entry_type == TYPE_DIR) {
    + /* new_ei, new_clu_to_free */
    + struct exfat_chain new_clu_to_free;
    +
    + exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
    + EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
    + sbi), new_ei->flags);
    +
    + if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
    + /* just set I/O error only */
    + ret = -EIO;
    + }
    +
    + i_size_write(new_inode, 0);
    + new_ei->start_clu = EXFAT_EOF_CLUSTER;
    + new_ei->flags = ALLOC_NO_FAT_CHAIN;
    + }
    +del_out:
    + /* Update new_inode ei
    + * Prevent syncing removed new_inode
    + * (new_ei is already initialized above code ("if (new_inode)")
    + */
    + new_ei->dir.dir = DIR_DELETED;
    + }
    + exfat_set_vol_flags(sb, VOL_CLEAN);
    +out:
    + return ret;
    +}
    +
    +static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
    + struct inode *new_dir, struct dentry *new_dentry,
    + unsigned int flags)
    +{
    + struct inode *old_inode, *new_inode;
    + struct super_block *sb = old_dir->i_sb;
    + loff_t i_pos;
    + int err;
    +
    + /*
    + * The VFS already checks for existence, so for local filesystems
    + * the RENAME_NOREPLACE implementation is equivalent to plain rename.
    + * Don't support any other flags
    + */
    + if (flags & ~RENAME_NOREPLACE)
    + return -EINVAL;
    +
    + mutex_lock(&EXFAT_SB(sb)->s_lock);
    + old_inode = old_dentry->d_inode;
    + new_inode = new_dentry->d_inode;
    +
    + err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
    + if (err)
    + goto unlock;
    +
    + inode_inc_iversion(new_dir);
    + new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
    + current_time(new_dir);
    + if (IS_DIRSYNC(new_dir))
    + exfat_sync_inode(new_dir);
    + else
    + mark_inode_dirty(new_dir);
    +
    + i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
    + (EXFAT_I(old_inode)->entry & 0xffffffff);
    + exfat_unhash_inode(old_inode);
    + exfat_hash_inode(old_inode, i_pos);
    + if (IS_DIRSYNC(new_dir))
    + exfat_sync_inode(old_inode);
    + else
    + mark_inode_dirty(old_inode);
    +
    + if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
    + drop_nlink(old_dir);
    + if (!new_inode)
    + inc_nlink(new_dir);
    + }
    +
    + inode_inc_iversion(old_dir);
    + old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
    + if (IS_DIRSYNC(old_dir))
    + exfat_sync_inode(old_dir);
    + else
    + mark_inode_dirty(old_dir);
    +
    + if (new_inode) {
    + exfat_unhash_inode(new_inode);
    +
    + /* skip drop_nlink if new_inode already has been dropped */
    + if (new_inode->i_nlink) {
    + drop_nlink(new_inode);
    + if (S_ISDIR(new_inode->i_mode))
    + drop_nlink(new_inode);
    + } else {
    + exfat_msg(sb, KERN_WARNING,
    + "abnormal access to an inode dropped");
    + WARN_ON(new_inode->i_nlink == 0);
    + }
    + new_inode->i_ctime = current_time(new_inode);
    + }
    +
    +unlock:
    + mutex_unlock(&EXFAT_SB(sb)->s_lock);
    + return err;
    +}
    +
    +const struct inode_operations exfat_dir_inode_operations = {
    + .create = exfat_create,
    + .lookup = exfat_lookup,
    + .unlink = exfat_unlink,
    + .mkdir = exfat_mkdir,
    + .rmdir = exfat_rmdir,
    + .rename = exfat_rename,
    + .setattr = exfat_setattr,
    + .getattr = exfat_getattr,
    +};
    --
    2.17.1
    \
     
     \ /
      Last update: 2020-01-15 09:29    [W:4.770 / U:0.116 seconds]
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