Commit 5f2aa075 authored by Namjae Jeon's avatar Namjae Jeon Committed by Al Viro

exfat: add inode operations

This adds the implementation of inode operations for exfat.
Signed-off-by: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarSungjong Seo <sj1557.seo@samsung.com>
Reviewed-by: default avatarPali Rohár <pali.rohar@gmail.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 719c1e18
// 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, &ei->i_crtime,
&ep->dentry.file.create_tz,
&ep->dentry.file.create_time,
&ep->dentry.file.create_date,
&ep->dentry.file.create_time_ms);
exfat_set_entry_time(sbi, &inode->i_mtime,
&ep->dentry.file.modify_tz,
&ep->dentry.file.modify_time,
&ep->dentry.file.modify_date,
&ep->dentry.file.modify_time_ms);
exfat_set_entry_time(sbi, &inode->i_atime,
&ep->dentry.file.access_tz,
&ep->dentry.file.access_time,
&ep->dentry.file.access_date,
NULL);
/* 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->mtime;
ei->i_crtime = info->crtime;
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);
}
// 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->crtime, 0, sizeof(info->crtime));
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 = 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 =
EXFAT_I(inode)->i_crtime = 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->crtime, 0, sizeof(info->crtime));
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->crtime,
ep->dentry.file.create_tz,
ep->dentry.file.create_time,
ep->dentry.file.create_date,
ep->dentry.file.create_time_ms);
exfat_get_entry_time(sbi, &info->mtime,
ep->dentry.file.modify_tz,
ep->dentry.file.modify_time,
ep->dentry.file.modify_date,
ep->dentry.file.modify_time_ms);
exfat_get_entry_time(sbi, &info->atime,
ep->dentry.file.access_tz,
ep->dentry.file.access_time,
ep->dentry.file.access_date,
0);
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 = 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 =
EXFAT_I(inode)->i_crtime = 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 =
EXFAT_I(new_dir)->i_crtime = 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 = EXFAT_I(new_inode)->i_crtime =
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,
};
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