2019-11-13 08:25:41

by Namjae Jeon

Subject: [PATCH 00/13] add the latest exfat driver

This adds the latest Samsung exfat driver to fs/exfat. This is an
implementation of the Microsoft exFAT specification. Previous versions
of this shipped with millions of Android phones, an a random previous
snaphot has been merged in drivers/staging/.

Compared to the sdfat driver shipped on the phones the following changes
have been made:

- the support for vfat has been removed as that is already supported
by fs/fat
- driver has been renamed to exfat
- the code has been refactored and clean up to fully integrate into
the upstream Linux version and follow the Linux coding style
- metadata operations like create, lookup and readdir have been further
optimized
- various major and minor bugs have been fixed

We plan to treat this version as the future upstream for the code base
once merged, and all new features and bug fixes will go upstream first.

Namjae Jeon (13):
exfat: add in-memory structure and headers
exfat: add super block operations
exfat: add inode operations
exfat: add directory operations
exfat: add file operations
exfat: add exfat entry operations
exfat: add bitmap operations
exfat: add exfat cache
exfat: add misc operations
exfat: add nls operations
exfat: add Kconfig and Makefile
exfat: add exfat in fs/Kconfig and fs/Makefile
MAINTAINERS: add exfat filesystem

MAINTAINERS | 7 +
fs/Kconfig | 3 +-
fs/Makefile | 1 +
fs/exfat/Kconfig | 21 +
fs/exfat/Makefile | 8 +
fs/exfat/balloc.c | 267 ++++++++
fs/exfat/cache.c | 325 +++++++++
fs/exfat/dir.c | 1338 +++++++++++++++++++++++++++++++++++++
fs/exfat/exfat_fs.h | 533 +++++++++++++++
fs/exfat/exfat_raw.h | 190 ++++++
fs/exfat/fatent.c | 475 ++++++++++++++
fs/exfat/file.c | 346 ++++++++++
fs/exfat/inode.c | 691 +++++++++++++++++++
fs/exfat/misc.c | 247 +++++++
fs/exfat/namei.c | 1492 ++++++++++++++++++++++++++++++++++++++++++
fs/exfat/nls.c | 817 +++++++++++++++++++++++
fs/exfat/super.c | 752 +++++++++++++++++++++
17 files changed, 7512 insertions(+), 1 deletion(-)
create mode 100644 fs/exfat/Kconfig
create mode 100644 fs/exfat/Makefile
create mode 100644 fs/exfat/balloc.c
create mode 100644 fs/exfat/cache.c
create mode 100644 fs/exfat/dir.c
create mode 100644 fs/exfat/exfat_fs.h
create mode 100644 fs/exfat/exfat_raw.h
create mode 100644 fs/exfat/fatent.c
create mode 100644 fs/exfat/file.c
create mode 100644 fs/exfat/inode.c
create mode 100644 fs/exfat/misc.c
create mode 100644 fs/exfat/namei.c
create mode 100644 fs/exfat/nls.c
create mode 100644 fs/exfat/super.c

--
2.17.1

2019-11-13 08:25:43

by Namjae Jeon

Subject: [PATCH 03/13] exfat: add inode operations

This adds the implementation of inode operations for exfat.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
---
fs/exfat/inode.c | 691 +++++++++++++++++++++
fs/exfat/namei.c | 1492 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 2183 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..053618545adf
--- /dev/null
+++ b/fs/exfat/inode.c
@@ -0,0 +1,691 @@
+// 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"
+
+/* 2-level option flag */
+#define BMAP_NOT_CREATE 0
+#define BMAP_ADD_CLUSTER 1
+
+static int __exfat_write_inode(struct inode *inode, int sync)
+{
+ int ret = -EIO;
+ unsigned long long on_disk_size;
+ struct exfat_timestamp tm;
+ 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);
+ unsigned char is_dir = (ei->type == TYPE_DIR) ? 1 : 0;
+ struct exfat_dir_entry info;
+
+ if (inode->i_ino == EXFAT_ROOT_INO)
+ return 0;
+
+ info.attr = exfat_make_attr(inode);
+ info.size = i_size_read(inode);
+
+ exfat_time_unix2fat(sbi, &inode->i_mtime, &info.modify_timestamp);
+ exfat_time_unix2fat(sbi, &inode->i_ctime, &info.create_timestamp);
+ exfat_time_unix2fat(sbi, &inode->i_atime, &info.access_timestamp);
+
+ /*
+ * 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->file_attr = cpu_to_le16(info.attr);
+
+ /* set FILE_INFO structure using the acquired struct exfat_dentry */
+ tm.sec = info.create_timestamp.second;
+ tm.min = info.create_timestamp.minute;
+ tm.hour = info.create_timestamp.hour;
+ tm.day = info.create_timestamp.day;
+ tm.mon = info.create_timestamp.month;
+ tm.year = info.create_timestamp.year;
+ exfat_set_entry_time(ep, &tm, TM_CREATE);
+
+ tm.sec = info.modify_timestamp.second;
+ tm.min = info.modify_timestamp.minute;
+ tm.hour = info.modify_timestamp.hour;
+ tm.day = info.modify_timestamp.day;
+ tm.mon = info.modify_timestamp.month;
+ tm.year = info.modify_timestamp.year;
+ exfat_set_entry_time(ep, &tm, TM_MODIFY);
+
+ /* File size should be zero if there is no cluster allocated */
+ on_disk_size = info.size;
+
+ if (ei->start_clu == EOF_CLUSTER)
+ on_disk_size = 0;
+
+ ep2->stream_valid_size = cpu_to_le64(on_disk_size);
+ ep2->stream_size = ep2->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 = EOF_CLUSTER;
+ return 0;
+ }
+
+ *clu = last_clu = ei->start_clu;
+
+ if (ei->flags == 0x03) {
+ if (clu_offset > 0 && *clu != EOF_CLUSTER) {
+ last_clu += clu_offset - 1;
+
+ if (clu_offset == num_clusters)
+ *clu = 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 != 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 != EOF_CLUSTER) {
+ last_clu = *clu;
+ if (exfat_get_next_cluster(sb, clu))
+ return -EIO;
+ clu_offset--;
+ }
+ }
+
+ if (*clu == EOF_CLUSTER) {
+ exfat_set_vol_flags(sb, VOL_DIRTY);
+
+ new_clu.dir = (last_clu == EOF_CLUSTER) ?
+ 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 == EOF_CLUSTER || new_clu.dir == 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 == EOF_CLUSTER) {
+ if (new_clu.flags == 0x01)
+ ei->flags = 0x01;
+ 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 = 0x01;
+ modified = true;
+ }
+ if (new_clu.flags == 0x01)
+ 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->stream_flags != ei->flags)
+ ep->stream_flags = ei->flags;
+
+ if (le32_to_cpu(ep->stream_start_clu) !=
+ ei->start_clu)
+ ep->stream_start_clu =
+ cpu_to_le32(ei->start_clu);
+
+ ep->stream_valid_size =
+ cpu_to_le64(i_size_read(inode));
+ ep->stream_size = ep->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 == 0x03) {
+ *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_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+ unsigned long *mapped_blocks, int *create)
+{
+ struct super_block *sb = inode->i_sb;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ sector_t last_block;
+ unsigned int cluster, clu_offset, sec_offset;
+ int err = 0;
+
+ *phys = 0;
+ *mapped_blocks = 0;
+
+ last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
+ if (sector >= last_block && *create == BMAP_NOT_CREATE)
+ return 0;
+
+ /* Is this block already allocated? */
+ clu_offset = sector >> sbi->sect_per_clus_bits; /* cluster offset */
+
+ err = exfat_map_cluster(inode, clu_offset, &cluster,
+ *create & BMAP_ADD_CLUSTER);
+ if (err) {
+ if (err != -ENOSPC)
+ return -EIO;
+ return err;
+ }
+
+ if (cluster != EOF_CLUSTER) {
+ /* sector offset in cluster */
+ sec_offset = sector & (sbi->sect_per_clus - 1);
+
+ *phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
+ *mapped_blocks = sbi->sect_per_clus - sec_offset;
+ }
+
+ if (sector < last_block)
+ *create = BMAP_NOT_CREATE;
+ return 0;
+}
+
+static int exfat_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ struct super_block *sb = inode->i_sb;
+ unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
+ int err = 0;
+ unsigned long mapped_blocks;
+ sector_t phys;
+ loff_t pos;
+ int bmap_create = create ? BMAP_ADD_CLUSTER : BMAP_NOT_CREATE;
+
+ mutex_lock(&EXFAT_SB(sb)->s_lock);
+ err = exfat_bmap(inode, iblock, &phys, &mapped_blocks, &bmap_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 (phys) {
+ max_blocks = min(mapped_blocks, max_blocks);
+
+ /* Treat newly added block / cluster */
+ if (bmap_create || buffer_delay(bh_result)) {
+ /* Update i_size_ondisk */
+ pos = EXFAT_BLK_TO_B((iblock + 1), sb);
+ if (EXFAT_I(inode)->i_size_ondisk < pos)
+ EXFAT_I(inode)->i_size_ondisk = pos;
+
+ if (bmap_create) {
+ if (buffer_delay(bh_result) &&
+ pos > EXFAT_I(inode)->i_size_aligned) {
+ exfat_fs_error(sb,
+ "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
+ pos,
+ EXFAT_I(inode)->i_size_aligned);
+ err = -EIO;
+ goto unlock_ret;
+ }
+ set_buffer_new(bh_result);
+
+ /*
+ * adjust i_size_aligned if i_size_ondisk is
+ * bigger than it. (i.e. non-DA)
+ */
+ if (EXFAT_I(inode)->i_size_ondisk >
+ EXFAT_I(inode)->i_size_aligned) {
+ EXFAT_I(inode)->i_size_aligned =
+ EXFAT_I(inode)->i_size_ondisk;
+ }
+ }
+
+ if (buffer_delay(bh_result))
+ clear_buffer_delay(bh_result);
+ }
+ map_bh(bh_result, sb, phys);
+ }
+
+ bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
+unlock_ret:
+ mutex_unlock(&EXFAT_SB(sb)->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;
+}
+
+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 = 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;
+
+ exfat_time_fat2unix(sbi, &inode->i_mtime, &info->modify_timestamp);
+ exfat_time_fat2unix(sbi, &inode->i_ctime, &info->create_timestamp);
+ exfat_time_fat2unix(sbi, &inode->i_atime, &info->access_timestamp);
+
+ 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..364c762e74c0
--- /dev/null
+++ b/fs/exfat/namei.c
@@ -0,0 +1,1492 @@
+// 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_revalidate_common(struct dentry *dentry)
+{
+ int ret = 1;
+
+ spin_lock(&dentry->d_lock);
+ if (!inode_eq_iversion(d_inode(dentry->d_parent),
+ exfat_d_version(dentry)))
+ ret = 0;
+ spin_unlock(&dentry->d_lock);
+ return ret;
+}
+
+static int __exfat_revalidate(struct dentry *dentry)
+{
+ /* This is not negative dentry. Always valid. */
+ if (d_really_is_positive(dentry))
+ return 1;
+ return __exfat_revalidate_common(dentry);
+}
+
+static int __exfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
+{
+ /*
+ * 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;
+ return __exfat_revalidate_common(dentry);
+}
+
+
+/* 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;
+}
+
+static unsigned int exfat_striptail_len(const struct qstr *qstr)
+{
+ return __exfat_striptail_len(qstr->len, qstr->name);
+}
+
+static inline unsigned int __exfat_full_name_hash(const struct dentry *dentry,
+ const char *name, unsigned int len)
+{
+ return full_name_hash(dentry, name, len);
+}
+
+static inline unsigned long __exfat_init_name_hash(const struct dentry *dentry)
+{
+ return init_name_hash(dentry);
+}
+
+/*
+ * Compute the hash for the exfat name corresponding to the dentry.
+ * Note: 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)
+{
+ unsigned int len = exfat_striptail_len(qstr);
+
+ qstr->hash = __exfat_full_name_hash(dentry, qstr->name, len);
+ return 0;
+}
+
+/*
+ * Compute the hash for the exfat name corresponding to the dentry.
+ * Note: 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_hashi(const struct dentry *dentry, struct qstr *qstr)
+{
+ struct nls_table *t = EXFAT_SB(dentry->d_sb)->nls_io;
+ const unsigned char *name;
+ unsigned int len;
+ unsigned long hash;
+
+ name = qstr->name;
+ len = exfat_striptail_len(qstr);
+
+ hash = __exfat_init_name_hash(dentry);
+ while (len--)
+ hash = partial_name_hash(nls_tolower(t, *name++), hash);
+ qstr->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+/*
+ * Case sensitive compare of two exfat names.
+ */
+static int exfat_cmp(const struct dentry *dentry, unsigned int len,
+ const char *str, const struct qstr *name)
+{
+ unsigned int alen, blen;
+
+ /* A filename cannot end in '.' or we treat it like it has none */
+ alen = exfat_striptail_len(name);
+ blen = __exfat_striptail_len(len, str);
+ if (alen == blen) {
+ if (strncmp(name->name, str, alen) == 0)
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Case insensitive compare of two exfat names.
+ */
+static int exfat_cmpi(const struct dentry *dentry, unsigned int len,
+ const char *str, const struct qstr *name)
+{
+ struct nls_table *t = EXFAT_SB(dentry->d_sb)->nls_io;
+ unsigned int alen, blen;
+
+ /* A filename cannot end in '.' or we treat it like it has none */
+ alen = exfat_striptail_len(name);
+ blen = __exfat_striptail_len(len, str);
+ if (alen == blen) {
+ if (nls_strnicmp(t, name->name, str, alen) == 0)
+ return 0;
+ }
+ return 1;
+}
+
+static int exfat_revalidate(struct dentry *dentry, unsigned int flags)
+{
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ return __exfat_revalidate(dentry);
+}
+
+static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
+{
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ return __exfat_revalidate_ci(dentry, flags);
+}
+
+const struct dentry_operations exfat_dentry_ops = {
+ .d_revalidate = exfat_revalidate,
+ .d_hash = exfat_d_hash,
+ .d_compare = exfat_cmp,
+};
+
+const struct dentry_operations exfat_ci_dentry_ops = {
+ .d_revalidate = exfat_revalidate_ci,
+ .d_hash = exfat_d_hashi,
+ .d_compare = exfat_cmpi,
+};
+
+/* 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, ret = -ENOSPC;
+ 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;
+ }
+
+ clu = exfat_chain_dup(&hint_femp->cur);
+ } else {
+ clu = exfat_chain_dup(p_dir);
+ dentry = 0;
+ }
+
+ while (clu->dir != 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) {
+ ret = -EIO;
+ goto out;
+ }
+ 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);
+ ret = -EIO;
+ goto out;
+ }
+
+ 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;
+ ret = (dentry - (num_entries - 1));
+ goto out;
+ }
+ }
+
+ if (clu->flags == 0x03) {
+ if (--clu->size > 0)
+ clu->dir++;
+ else
+ clu->dir = EOF_CLUSTER;
+ } else {
+ if (exfat_get_next_cluster(sb, &clu->dir)) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ }
+out:
+ kfree(clu);
+ return ret;
+}
+
+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.
+ */
+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 = 0x01;
+ hint_femp.cur.flags = 0x01;
+ }
+
+ if (clu.flags == 0x01)
+ 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->stream_valid_size = cpu_to_le64(size);
+ ep->stream_size = ep->stream_valid_size;
+ ep->stream_flags = p_dir->flags;
+ exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
+ brelse(bh);
+ if (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);
+
+ /* DOT and DOTDOT are handled by VFS layer */
+
+ /* strip all trailing spaces */
+ /* DO NOTHING : Is needed? */
+
+ /* strip all trailing periods */
+ namelen = __exfat_striptail_len(strlen(path), path);
+ if (!namelen)
+ return -ENOENT;
+
+ /* the limitation of linux? */
+ 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_vfsname_to_uni16s(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 = FREE_CLUSTER;
+
+ ret = exfat_resolve_path(inode, path, p_dir, &uniname);
+ if (ret)
+ goto out;
+
+ num_entries = exfat_get_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 = 0x03;
+ info->type = type;
+
+ if (type == TYPE_FILE) {
+ info->attr = ATTR_ARCHIVE;
+ info->start_clu = 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->create_timestamp, 0,
+ sizeof(struct exfat_date_time));
+ memset(&info->modify_timestamp, 0,
+ sizeof(struct exfat_date_time));
+ memset(&info->access_timestamp, 0,
+ sizeof(struct exfat_date_time));
+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 out;
+
+ 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 out;
+
+ 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);
+out:
+ 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);
+ struct exfat_timestamp tm;
+
+ 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_get_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 = 0x01;
+ info->start_clu = sbi->root_dir;
+ memset(&info->create_timestamp, 0,
+ sizeof(struct exfat_date_time));
+ memset(&info->modify_timestamp, 0,
+ sizeof(struct exfat_date_time));
+ memset(&info->access_timestamp, 0,
+ sizeof(struct exfat_date_time));
+
+ exfat_chain_set(&cdir, sbi->root_dir, 0, 0x01);
+ 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->file_attr);
+ info->size = le64_to_cpu(ep2->stream_valid_size);
+ if ((info->type == TYPE_FILE) && (info->size == 0)) {
+ info->flags = 0x03;
+ info->start_clu = EOF_CLUSTER;
+ } else {
+ info->flags = ep2->stream_flags;
+ info->start_clu = le32_to_cpu(ep2->stream_start_clu);
+ }
+
+ if (ei->start_clu == 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(ep, &tm, TM_CREATE);
+ info->create_timestamp.year = tm.year;
+ info->create_timestamp.month = tm.mon;
+ info->create_timestamp.day = tm.day;
+ info->create_timestamp.hour = tm.hour;
+ info->create_timestamp.minute = tm.min;
+ info->create_timestamp.second = tm.sec;
+ info->create_timestamp.milli_second = 0;
+
+ exfat_get_entry_time(ep, &tm, TM_MODIFY);
+ info->modify_timestamp.year = tm.year;
+ info->modify_timestamp.month = tm.mon;
+ info->modify_timestamp.day = tm.day;
+ info->modify_timestamp.hour = tm.hour;
+ info->modify_timestamp.minute = tm.min;
+ info->modify_timestamp.second = tm.sec;
+ info->modify_timestamp.milli_second = 0;
+
+ memset(&info->access_timestamp, 0,
+ sizeof(struct exfat_date_time));
+ 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 error;
+ }
+
+ i_pos = exfat_make_i_pos(&info);
+ inode = exfat_build_inode(sb, &info, i_pos);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto error;
+ }
+
+ 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:
+ /* initialize d_time even though it is positive dentry */
+ dentry->d_time = inode_peek_iversion_raw(dir);
+ mutex_unlock(&EXFAT_SB(sb)->s_lock);
+ if (!inode)
+ exfat_d_version_set(dentry, inode_query_iversion(dir));
+
+ return d_splice_alias(inode, dentry);
+error:
+ 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);
+ cdir = exfat_chain_dup(&ei->dir);
+ if (!cdir) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ entry = ei->entry;
+
+ if (ei->dir.dir == DIR_DELETED) {
+ exfat_msg(sb, KERN_ERR, "abnormal access to deleted dentry");
+ err = -ENOENT;
+ goto out;
+ }
+
+ ep = exfat_get_dentry(sb, cdir, entry, &bh, &sector);
+ if (!ep) {
+ err = -EIO;
+ goto out;
+ }
+ num_entries = exfat_count_ext_entries(sb, cdir, entry, ep);
+ if (num_entries < 0) {
+ err = -EIO;
+ brelse(bh);
+ goto out;
+ }
+ 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 out;
+ }
+
+ /* 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);
+ dentry->d_time = inode_peek_iversion_raw(dir);
+ exfat_d_version_set(dentry, inode_query_iversion(dir));
+out:
+ mutex_unlock(&EXFAT_SB(sb)->s_lock);
+ kfree(cdir);
+
+ 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 out;
+
+ 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 out;
+ }
+
+ 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);
+
+out:
+ 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, ret = 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;
+
+ clu = exfat_chain_dup(p_dir);
+
+ while (clu->dir != EOF_CLUSTER) {
+ for (i = 0; i < dentries_per_clu; i++) {
+ ep = exfat_get_dentry(sb, clu, i, &bh, NULL);
+ if (!ep) {
+ ret = -EIO;
+ goto out;
+ }
+ type = exfat_get_entry_type(ep);
+ brelse(bh);
+ if (type == TYPE_UNUSED)
+ goto out;
+
+ if (type != TYPE_FILE && type != TYPE_DIR)
+ continue;
+
+ ret = -ENOTEMPTY;
+ goto out;
+ }
+
+ if (clu->flags == 0x03) {
+ if (--clu->size > 0)
+ clu->dir++;
+ else
+ clu->dir = EOF_CLUSTER;
+ } else {
+ if (exfat_get_next_cluster(sb, &(clu->dir))) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ }
+
+out:
+ kfree(clu);
+ return ret;
+}
+
+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);
+
+ cdir = exfat_chain_dup(&ei->dir);
+ entry = ei->entry;
+
+ if (ei->dir.dir == DIR_DELETED) {
+ exfat_msg(sb, KERN_ERR, "abnormal access to deleted dentry");
+ err = -ENOENT;
+ goto out;
+ }
+
+ 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 out;
+ }
+
+ ep = exfat_get_dentry(sb, cdir, entry, &bh, &sector);
+ if (!ep) {
+ err = -EIO;
+ goto out;
+ }
+
+ num_entries = exfat_count_ext_entries(sb, cdir, entry, ep);
+ if (num_entries < 0) {
+ err = -EIO;
+ brelse(bh);
+ goto out;
+ }
+ 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 out;
+ }
+ 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);
+ dentry->d_time = inode_peek_iversion_raw(dir);
+ exfat_d_version_set(dentry, inode_query_iversion(dir));
+out:
+ mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
+ kfree(cdir);
+ 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_get_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->file_attr |= ATTR_ARCHIVE_LE;
+ 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->file_attr |= ATTR_ARCHIVE_LE;
+ 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->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_get_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->file_attr |= ATTR_ARCHIVE_LE;
+ 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);
+
+ olddir = exfat_chain_dup(&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 = EOF_CLUSTER;
+ new_ei->flags = 0x03;
+ }
+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:
+ kfree(olddir);
+ 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 out;
+
+ 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);
+ }
+
+out:
+ 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

2019-11-13 08:25:53

by Namjae Jeon

Subject: [PATCH 04/13] exfat: add directory operations

This adds the implementation of directory operations for exfat.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
---
fs/exfat/dir.c | 1338 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1338 insertions(+)
create mode 100644 fs/exfat/dir.c

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
new file mode 100644
index 000000000000..7eda1a8fbe59
--- /dev/null
+++ b/fs/exfat/dir.c
@@ -0,0 +1,1338 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/slab.h>
+#include <linux/bio.h>
+#include <linux/buffer_head.h>
+
+#include "exfat_raw.h"
+#include "exfat_fs.h"
+
+/* read a directory entry from the opened directory */
+static int exfat_readdir(struct inode *inode, struct exfat_dir_entry *dir_entry)
+{
+ int i, ret = 0;
+ int dentries_per_clu, dentries_per_clu_bits = 0;
+ unsigned int type, clu_offset;
+ sector_t sector;
+ struct exfat_chain dir, *clu;
+ struct exfat_uni_name uni_name;
+ struct exfat_timestamp tm;
+ struct exfat_dentry *ep;
+ 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 dentry = ei->rwoffset & 0xFFFFFFFF;
+ struct buffer_head *bh;
+
+ /* check if the given file ID is opened */
+ if (ei->type != TYPE_DIR)
+ return -EPERM;
+
+ if (ei->entry == -1)
+ exfat_chain_set(&dir, sbi->root_dir, 0, 0x01);
+ else
+ exfat_chain_set(&dir, ei->start_clu,
+ EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
+
+ dentries_per_clu = sbi->dentries_per_clu;
+ dentries_per_clu_bits = ilog2(dentries_per_clu);
+
+ clu_offset = dentry >> dentries_per_clu_bits;
+ clu = exfat_chain_dup(&dir);
+ if (!clu)
+ return -ENOMEM;
+
+ if (clu->flags == 0x03) {
+ clu->dir += clu_offset;
+ clu->size -= clu_offset;
+ } else {
+ /* hint_information */
+ if (clu_offset > 0 && ei->hint_bmap.off != EOF_CLUSTER &&
+ ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
+ clu_offset -= ei->hint_bmap.off;
+ clu->dir = ei->hint_bmap.clu;
+ }
+
+ while (clu_offset > 0) {
+ if (exfat_get_next_cluster(sb, &(clu->dir))) {
+ ret = -EIO;
+ goto out;
+ }
+
+ clu_offset--;
+ }
+ }
+
+ while (clu->dir != EOF_CLUSTER) {
+ i = dentry & (dentries_per_clu - 1);
+
+ for ( ; i < dentries_per_clu; i++, dentry++) {
+ ep = exfat_get_dentry(sb, clu, i, &bh, &sector);
+ if (!ep) {
+ ret = -EIO;
+ goto out;
+ }
+ type = exfat_get_entry_type(ep);
+
+ if (type == TYPE_UNUSED) {
+ brelse(bh);
+ break;
+ }
+
+ if (type != TYPE_FILE && type != TYPE_DIR) {
+ brelse(bh);
+ continue;
+ }
+
+ dir_entry->attr = le16_to_cpu(ep->file_attr);
+
+ exfat_get_entry_time(ep, &tm, TM_CREATE);
+ dir_entry->create_timestamp.year = tm.year;
+ dir_entry->create_timestamp.month = tm.mon;
+ dir_entry->create_timestamp.day = tm.day;
+ dir_entry->create_timestamp.hour = tm.hour;
+ dir_entry->create_timestamp.minute = tm.min;
+ dir_entry->create_timestamp.second = tm.sec;
+ dir_entry->create_timestamp.milli_second = 0;
+
+ exfat_get_entry_time(ep, &tm, TM_MODIFY);
+ dir_entry->modify_timestamp.year = tm.year;
+ dir_entry->modify_timestamp.month = tm.mon;
+ dir_entry->modify_timestamp.day = tm.day;
+ dir_entry->modify_timestamp.hour = tm.hour;
+ dir_entry->modify_timestamp.minute = tm.min;
+ dir_entry->modify_timestamp.second = tm.sec;
+ dir_entry->modify_timestamp.milli_second = 0;
+
+ memset(&dir_entry->access_timestamp, 0,
+ sizeof(struct exfat_date_time));
+
+ *uni_name.name = 0x0;
+ exfat_get_uniname_from_ext_entry(sb, &dir, dentry,
+ uni_name.name);
+ exfat_nls_uni16s_to_vfsname(sb, &uni_name,
+ dir_entry->namebuf.lfn,
+ dir_entry->namebuf.lfnbuf_len);
+ brelse(bh);
+
+ ep = exfat_get_dentry(sb, clu, i + 1, &bh, NULL);
+ if (!ep) {
+ ret = -EIO;
+ goto out;
+ }
+ dir_entry->size = le64_to_cpu(ep->stream_valid_size);
+ brelse(bh);
+
+ ei->hint_bmap.off = dentry >> dentries_per_clu_bits;
+ ei->hint_bmap.clu = clu->dir;
+
+ ei->rwoffset = ++dentry;
+ goto out;
+ }
+
+ if (clu->flags == 0x03) {
+ if (--clu->size > 0)
+ clu->dir++;
+ else
+ clu->dir = EOF_CLUSTER;
+ } else {
+ if (exfat_get_next_cluster(sb, &(clu->dir))) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ }
+
+ dir_entry->namebuf.lfn[0] = '\0';
+ ei->rwoffset = dentry;
+
+out:
+ kfree(clu);
+ return ret;
+}
+
+static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb)
+{
+ nb->lfn = NULL;
+ nb->lfnbuf_len = 0;
+}
+
+static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb)
+{
+ nb->lfn = __getname();
+ if (!nb->lfn)
+ return -ENOMEM;
+ nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE;
+ return 0;
+}
+
+static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb)
+{
+ if (!nb->lfn)
+ return;
+
+ __putname(nb->lfn);
+ exfat_init_namebuf(nb);
+}
+
+/* skip iterating emit_dots when dir is empty */
+#define ITER_POS_FILLED_DOTS (2)
+static int exfat_iterate(struct file *filp, struct dir_context *ctx)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct super_block *sb = inode->i_sb;
+ struct inode *tmp;
+ struct exfat_dir_entry de;
+ struct exfat_dentry_namebuf *nb = &(de.namebuf);
+ struct exfat_inode_info *ei = EXFAT_I(inode);
+ unsigned long inum;
+ loff_t cpos, i_pos;
+ int err = 0, fake_offset = 0;
+
+ exfat_init_namebuf(nb);
+ mutex_lock(&EXFAT_SB(sb)->s_lock);
+
+ cpos = ctx->pos;
+ if (!dir_emit_dots(filp, ctx))
+ goto out;
+
+ if (ctx->pos == ITER_POS_FILLED_DOTS) {
+ cpos = 0;
+ fake_offset = 1;
+ }
+
+ if (cpos & (DENTRY_SIZE - 1)) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ /* name buffer should be allocated before use */
+ err = exfat_alloc_namebuf(nb);
+ if (err)
+ goto out;
+get_new:
+ ei->rwoffset = EXFAT_B_TO_DEN(cpos);
+
+ if (cpos >= i_size_read(inode))
+ goto end_of_dir;
+
+ err = exfat_readdir(inode, &de);
+ if (err) {
+ /*
+ * At least we tried to read a sector. Move cpos to next sector
+ * position (should be aligned).
+ */
+ if (err == -EIO) {
+ cpos += 1 << (sb->s_blocksize_bits);
+ cpos &= ~(sb->s_blocksize - 1);
+ }
+
+ err = -EIO;
+ goto end_of_dir;
+ }
+
+ cpos = EXFAT_DEN_TO_B(ei->rwoffset);
+
+ if (!nb->lfn[0])
+ goto end_of_dir;
+
+ i_pos = ((loff_t)ei->start_clu << 32) |
+ ((ei->rwoffset - 1) & 0xffffffff);
+ tmp = exfat_iget(sb, i_pos);
+ if (tmp) {
+ inum = tmp->i_ino;
+ iput(tmp);
+ } else {
+ inum = iunique(sb, EXFAT_ROOT_INO);
+ }
+
+ /*
+ * Before calling dir_emit(), sb_lock should be released.
+ * Because page fault can occur in dir_emit() when the size
+ * of buffer given from user is larger than one page size.
+ */
+ mutex_unlock(&EXFAT_SB(sb)->s_lock);
+ if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum,
+ (de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
+ goto out_unlocked;
+ mutex_lock(&EXFAT_SB(sb)->s_lock);
+ ctx->pos = cpos;
+ goto get_new;
+
+end_of_dir:
+ if (!cpos && fake_offset)
+ cpos = ITER_POS_FILLED_DOTS;
+ ctx->pos = cpos;
+out:
+ mutex_unlock(&EXFAT_SB(sb)->s_lock);
+out_unlocked:
+ /*
+ * To improve performance, free namebuf after unlock sb_lock.
+ * If namebuf is not allocated, this function do nothing
+ */
+ exfat_free_namebuf(nb);
+ return err;
+}
+
+const struct file_operations exfat_dir_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate = exfat_iterate,
+ .fsync = generic_file_fsync,
+};
+
+int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu)
+{
+ int ret;
+
+ exfat_chain_set(clu, EOF_CLUSTER, 0, 0x03);
+
+ ret = exfat_alloc_cluster(inode, 1, clu);
+ if (ret)
+ return ret;
+
+ return exfat_zeroed_cluster(inode, clu->dir);
+}
+
+static int exfat_calc_num_entries(struct exfat_uni_name *p_uniname)
+{
+ int len;
+
+ len = p_uniname->name_len;
+ if (len == 0)
+ return 0;
+
+ /* 1 file entry + 1 stream entry + name entries */
+ return ((len - 1) / 15 + 3);
+}
+
+/*
+ * input : dir, uni_name
+ * output : num_of_entry
+ */
+int exfat_get_num_entries(struct exfat_uni_name *p_uniname)
+{
+ int num_entries;
+
+ num_entries = exfat_calc_num_entries(p_uniname);
+ if (num_entries == 0)
+ return -EINVAL;
+
+ return num_entries;
+}
+
+unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
+{
+ if (ep->type == EXFAT_UNUSED)
+ return TYPE_UNUSED;
+ if (IS_EXFAT_DELETED(ep->type))
+ return TYPE_DELETED;
+ if (ep->type == EXFAT_INVAL)
+ return TYPE_INVALID;
+ if (ep->type < 0xA0) {
+ if (ep->type == EXFAT_BITMAP)
+ return TYPE_BITMAP;
+ if (ep->type == EXFAT_UPCASE)
+ return TYPE_UPCASE;
+ if (ep->type == EXFAT_VOLUME)
+ return TYPE_VOLUME;
+ if (ep->type == EXFAT_FILE) {
+ if (le16_to_cpu(ep->file_attr) & ATTR_SUBDIR)
+ return TYPE_DIR;
+ return TYPE_FILE;
+ }
+ return TYPE_CRITICAL_PRI;
+ }
+ if (ep->type < 0xC0) {
+ if (ep->type == EXFAT_GUID)
+ return TYPE_GUID;
+ if (ep->type == EXFAT_PADDING)
+ return TYPE_PADDING;
+ if (ep->type == EXFAT_ACLTAB)
+ return TYPE_ACLTAB;
+ return TYPE_BENIGN_PRI;
+ }
+ if (ep->type < 0xE0) {
+ if (ep->type == EXFAT_STREAM)
+ return TYPE_STREAM;
+ if (ep->type == EXFAT_NAME)
+ return TYPE_EXTEND;
+ if (ep->type == EXFAT_ACL)
+ return TYPE_ACL;
+ return TYPE_CRITICAL_SEC;
+ }
+ return TYPE_BENIGN_SEC;
+}
+
+static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type)
+{
+ if (type == TYPE_UNUSED) {
+ ep->type = EXFAT_UNUSED;
+ } else if (type == TYPE_DELETED) {
+ ep->type &= EXFAT_DELETE;
+ } else if (type == TYPE_STREAM) {
+ ep->type = EXFAT_STREAM;
+ } else if (type == TYPE_EXTEND) {
+ ep->type = EXFAT_NAME;
+ } else if (type == TYPE_BITMAP) {
+ ep->type = EXFAT_BITMAP;
+ } else if (type == TYPE_UPCASE) {
+ ep->type = EXFAT_UPCASE;
+ } else if (type == TYPE_VOLUME) {
+ ep->type = EXFAT_VOLUME;
+ } else if (type == TYPE_DIR) {
+ ep->type = EXFAT_FILE;
+ ep->file_attr = ATTR_SUBDIR_LE;
+ } else if (type == TYPE_FILE) {
+ ep->type = EXFAT_FILE;
+ ep->file_attr = ATTR_ARCHIVE_LE;
+ }
+}
+
+void exfat_get_entry_time(struct exfat_dentry *ep, struct exfat_timestamp *tp,
+ unsigned char mode)
+{
+ unsigned short t = 0x00, d = 0x21;
+
+ switch (mode) {
+ case TM_CREATE:
+ t = le16_to_cpu(ep->file_create_time);
+ d = le16_to_cpu(ep->file_create_date);
+ break;
+ case TM_MODIFY:
+ t = le16_to_cpu(ep->file_modify_time);
+ d = le16_to_cpu(ep->file_modify_date);
+ break;
+ case TM_ACCESS:
+ t = le16_to_cpu(ep->file_access_time);
+ d = le16_to_cpu(ep->file_access_date);
+ break;
+ }
+
+ tp->sec = (t & 0x001F) << 1;
+ tp->min = (t >> 5) & 0x003F;
+ tp->hour = (t >> 11);
+ tp->day = (d & 0x001F);
+ tp->mon = (d >> 5) & 0x000F;
+ tp->year = (d >> 9);
+}
+
+void exfat_set_entry_time(struct exfat_dentry *ep,
+ struct exfat_timestamp *tp, unsigned char mode)
+{
+ unsigned short t, d;
+
+ t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1);
+ d = (tp->year << 9) | (tp->mon << 5) | tp->day;
+
+ switch (mode) {
+ case TM_CREATE:
+ ep->file_create_time = cpu_to_le16(t);
+ ep->file_create_date = cpu_to_le16(d);
+ break;
+ case TM_MODIFY:
+ ep->file_modify_time = cpu_to_le16(t);
+ ep->file_modify_date = cpu_to_le16(d);
+ break;
+ case TM_ACCESS:
+ ep->file_access_time = cpu_to_le16(t);
+ ep->file_access_date = cpu_to_le16(d);
+ break;
+ }
+}
+
+static void exfat_init_file_entry(struct super_block *sb,
+ struct exfat_dentry *ep, unsigned int type)
+{
+ struct exfat_timestamp tm, *tp;
+
+ exfat_set_entry_type(ep, type);
+
+ tp = exfat_tm_now(EXFAT_SB(sb), &tm);
+ exfat_set_entry_time(ep, tp, TM_CREATE);
+ exfat_set_entry_time(ep, tp, TM_MODIFY);
+ exfat_set_entry_time(ep, tp, TM_ACCESS);
+ ep->file_create_time_ms = 0;
+ ep->file_modify_time_ms = 0;
+ ep->file_access_time_ms = 0;
+}
+
+static void exfat_init_stream_entry(struct exfat_dentry *ep,
+ unsigned char flags, unsigned int start_clu,
+ unsigned long long size)
+{
+ exfat_set_entry_type(ep, TYPE_STREAM);
+ ep->stream_flags = flags;
+ ep->stream_start_clu = cpu_to_le32(start_clu);
+ ep->stream_valid_size = cpu_to_le64(size);
+ ep->stream_size = cpu_to_le64(size);
+}
+
+static void exfat_init_name_entry(struct exfat_dentry *ep,
+ unsigned short *uniname)
+{
+ int i;
+
+ exfat_set_entry_type(ep, TYPE_EXTEND);
+ ep->name_flags = 0x0;
+
+ for (i = 0; i < 15; i++) {
+ ep->name_unicode[i] = cpu_to_le16(*uniname);
+ if (*uniname == 0x0)
+ break;
+ uniname++;
+ }
+}
+
+int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
+ int entry, unsigned int type, unsigned int start_clu,
+ unsigned long long size)
+{
+ struct super_block *sb = inode->i_sb;
+ sector_t sector;
+ unsigned char flags;
+ struct exfat_dentry *ep;
+ struct buffer_head *bh;
+ int sync = IS_DIRSYNC(inode);
+
+ flags = (type == TYPE_FILE) ? 0x01 : 0x03;
+
+ /*
+ * We cannot use exfat_get_dentry_set here because file ep is not
+ * initialized yet.
+ */
+ ep = exfat_get_dentry(sb, p_dir, entry, &bh, &sector);
+ if (!ep)
+ return -EIO;
+
+ exfat_init_file_entry(sb, ep, type);
+ exfat_update_bh(sb, bh, sync);
+ brelse(bh);
+
+ ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, &sector);
+ if (!ep)
+ return -EIO;
+
+ exfat_init_stream_entry(ep, flags, start_clu, size);
+ exfat_update_bh(sb, bh, sync);
+ brelse(bh);
+
+ return 0;
+}
+
+int update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
+ int entry)
+{
+ struct super_block *sb = inode->i_sb;
+ int ret = 0;
+ int i, num_entries;
+ sector_t sector;
+ unsigned short chksum;
+ struct exfat_dentry *ep, *fep;
+ struct buffer_head *fbh, *bh;
+
+ fep = exfat_get_dentry(sb, p_dir, entry, &fbh, &sector);
+ if (!fep)
+ return -EIO;
+
+ num_entries = fep->file_num_ext + 1;
+ chksum = exfat_calc_chksum_2byte(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY);
+
+ for (i = 1; i < num_entries; i++) {
+ ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, NULL);
+ if (!ep) {
+ ret = -EIO;
+ goto out_unlock;
+ }
+ chksum = exfat_calc_chksum_2byte(ep, DENTRY_SIZE, chksum,
+ CS_DEFAULT);
+ brelse(bh);
+ }
+
+ fep->file_checksum = cpu_to_le16(chksum);
+ exfat_update_bh(sb, fbh, IS_DIRSYNC(inode));
+out_unlock:
+ brelse(fbh);
+ return ret;
+}
+
+int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
+ int entry, int num_entries, struct exfat_uni_name *p_uniname)
+{
+ struct super_block *sb = inode->i_sb;
+ int i;
+ sector_t sector;
+ unsigned short *uniname = p_uniname->name;
+ struct exfat_dentry *ep;
+ struct buffer_head *bh;
+ int sync = IS_DIRSYNC(inode);
+
+ ep = exfat_get_dentry(sb, p_dir, entry, &bh, &sector);
+ if (!ep)
+ return -EIO;
+
+ ep->file_num_ext = (unsigned char)(num_entries - 1);
+ exfat_update_bh(sb, bh, sync);
+ brelse(bh);
+
+ ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, &sector);
+ if (!ep)
+ return -EIO;
+
+ ep->stream_name_len = p_uniname->name_len;
+ ep->stream_name_hash = cpu_to_le16(p_uniname->name_hash);
+ exfat_update_bh(sb, bh, sync);
+ brelse(bh);
+
+ for (i = 2; i < num_entries; i++) {
+ ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, &sector);
+ if (!ep)
+ return -EIO;
+
+ exfat_init_name_entry(ep, uniname);
+ exfat_update_bh(sb, bh, sync);
+ brelse(bh);
+ uniname += 15;
+ }
+
+ update_dir_chksum(inode, p_dir, entry);
+ return 0;
+}
+
+int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
+ int entry, int order, int num_entries)
+{
+ struct super_block *sb = inode->i_sb;
+ int i;
+ sector_t sector;
+ struct exfat_dentry *ep;
+ struct buffer_head *bh;
+
+ for (i = order; i < num_entries; i++) {
+ ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, &sector);
+ if (!ep)
+ return -EIO;
+
+ exfat_set_entry_type(ep, TYPE_DELETED);
+ exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
+ brelse(bh);
+ }
+
+ return 0;
+}
+
+int exfat_update_dir_chksum_with_entry_set(struct super_block *sb,
+ struct exfat_entry_set_cache *es, int sync)
+{
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct buffer_head *bh;
+ sector_t sec = es->sector;
+ unsigned int off = es->offset;
+ int chksum_type = CS_DIR_ENTRY, i, num_entries = es->num_entries;
+ unsigned int buf_off = (off - es->offset);
+ unsigned int remaining_byte_in_sector, copy_entries, clu;
+ unsigned short chksum = 0;
+
+ for (i = 0; i < num_entries; i++) {
+ chksum = exfat_calc_chksum_2byte(&es->entries[i], DENTRY_SIZE,
+ chksum, chksum_type);
+ chksum_type = CS_DEFAULT;
+ }
+
+ es->entries[0].file_checksum = cpu_to_le16(chksum);
+
+ while (num_entries) {
+ /* write per sector base */
+ remaining_byte_in_sector = (1 << sb->s_blocksize_bits) - off;
+ copy_entries = min_t(int,
+ EXFAT_B_TO_DEN(remaining_byte_in_sector),
+ num_entries);
+ bh = sb_bread(sb, sec);
+ if (!bh)
+ goto err_out;
+ memcpy(bh->b_data + off,
+ (unsigned char *)&es->entries[0] + buf_off,
+ EXFAT_DEN_TO_B(copy_entries));
+ exfat_update_bh(sb, bh, sync);
+ brelse(bh);
+ num_entries -= copy_entries;
+
+ if (num_entries) {
+ /* get next sector */
+ if (exfat_is_last_sector_in_cluster(sbi, sec)) {
+ clu = exfat_sector_to_cluster(sbi, sec);
+ if (es->alloc_flag == 0x03)
+ clu++;
+ else if (exfat_get_next_cluster(sb, &clu))
+ goto err_out;
+ sec = exfat_cluster_to_sector(sbi, clu);
+ } else {
+ sec++;
+ }
+ off = 0;
+ buf_off += EXFAT_DEN_TO_B(copy_entries);
+ }
+ }
+
+ return 0;
+err_out:
+ return -EIO;
+}
+
+static int exfat_walk_fat_chain(struct super_block *sb,
+ struct exfat_chain *p_dir, unsigned int byte_offset,
+ unsigned int *clu)
+{
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ unsigned int clu_offset;
+ unsigned int cur_clu;
+
+ clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi);
+ cur_clu = p_dir->dir;
+
+ if (p_dir->flags == 0x03) {
+ cur_clu += clu_offset;
+ } else {
+ while (clu_offset > 0) {
+ if (exfat_get_next_cluster(sb, &cur_clu))
+ return -EIO;
+ if (cur_clu == EOF_CLUSTER) {
+ exfat_fs_error(sb,
+ "invalid dentry access beyond EOF (clu : %u, eidx : %d)",
+ p_dir->dir,
+ EXFAT_B_TO_DEN(byte_offset));
+ return -EIO;
+ }
+ clu_offset--;
+ }
+ }
+
+ *clu = cur_clu;
+ return 0;
+}
+
+int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir,
+ int entry, sector_t *sector, int *offset)
+{
+ int ret;
+ unsigned int off, clu = 0;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+ off = EXFAT_DEN_TO_B(entry);
+
+ ret = exfat_walk_fat_chain(sb, p_dir, off, &clu);
+ if (ret)
+ return ret;
+
+ /* byte offset in cluster */
+ off = EXFAT_CLU_OFFSET(off, sbi);
+
+ /* byte offset in sector */
+ *offset = EXFAT_BLK_OFFSET(off, sb);
+
+ /* sector offset in cluster */
+ *sector = EXFAT_B_TO_BLK(off, sb);
+ *sector += exfat_cluster_to_sector(sbi, clu);
+ return 0;
+}
+
+#define EXFAT_MAX_RA_SIZE (128*1024)
+static int exfat_dir_readahead(struct super_block *sb, sector_t sec)
+{
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct buffer_head *bh;
+ unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits;
+ unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits;
+ unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count);
+ unsigned int ra_count = min(adj_ra_count, max_ra_count);
+
+ /* Read-ahead is not required */
+ if (sbi->sect_per_clus == 1)
+ return 0;
+
+ if (sec < sbi->data_start_sector) {
+ exfat_msg(sb, KERN_ERR,
+ "requested sector is invalid(sect:%llu, root:%llu)",
+ sec, sbi->data_start_sector);
+ return -EIO;
+ }
+
+ /* Not sector aligned with ra_count, resize ra_count to page size */
+ if ((sec - sbi->data_start_sector) & (ra_count - 1))
+ ra_count = page_ra_count;
+
+ bh = sb_find_get_block(sb, sec);
+ if (!bh || !buffer_uptodate(bh)) {
+ unsigned int i;
+
+ for (i = 0; i < ra_count; i++)
+ sb_breadahead(sb, (sector_t)(sec + i));
+ }
+ brelse(bh);
+ return 0;
+}
+
+struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
+ struct exfat_chain *p_dir, int entry, struct buffer_head **bh,
+ sector_t *sector)
+{
+ unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE);
+ int off;
+ sector_t sec;
+
+ if (p_dir->dir == DIR_DELETED) {
+ exfat_msg(sb, KERN_ERR, "abnormal access to deleted dentry\n");
+ return NULL;
+ }
+
+ if (exfat_find_location(sb, p_dir, entry, &sec, &off))
+ return NULL;
+
+ if (p_dir->dir != FREE_CLUSTER &&
+ !(entry & (dentries_per_page - 1)))
+ exfat_dir_readahead(sb, sec);
+
+ *bh = sb_bread(sb, sec);
+ if (!*bh)
+ return NULL;
+
+ if (sector)
+ *sector = sec;
+ return (struct exfat_dentry *)((*bh)->b_data + off);
+}
+
+enum exfat_validate_dentry_mode {
+ ES_MODE_STARTED,
+ ES_MODE_GET_FILE_ENTRY,
+ ES_MODE_GET_STRM_ENTRY,
+ ES_MODE_GET_NAME_ENTRY,
+ ES_MODE_GET_CRITICAL_SEC_ENTRY,
+};
+
+static bool exfat_validate_entry(unsigned int type,
+ enum exfat_validate_dentry_mode *mode)
+{
+ if (type == TYPE_UNUSED || type == TYPE_DELETED)
+ return false;
+
+ switch (*mode) {
+ case ES_MODE_STARTED:
+ if (type != TYPE_FILE && type != TYPE_DIR)
+ return false;
+ *mode = ES_MODE_GET_FILE_ENTRY;
+ return true;
+ case ES_MODE_GET_FILE_ENTRY:
+ if (type != TYPE_STREAM)
+ return false;
+ *mode = ES_MODE_GET_STRM_ENTRY;
+ return true;
+ case ES_MODE_GET_STRM_ENTRY:
+ if (type != TYPE_EXTEND)
+ return false;
+ *mode = ES_MODE_GET_NAME_ENTRY;
+ return true;
+ case ES_MODE_GET_NAME_ENTRY:
+ if (type == TYPE_STREAM)
+ return false;
+ if (type != TYPE_EXTEND) {
+ if (!(type & TYPE_CRITICAL_SEC))
+ return false;
+ *mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
+ }
+ return true;
+ case ES_MODE_GET_CRITICAL_SEC_ENTRY:
+ if (type == TYPE_EXTEND || type == TYPE_STREAM)
+ return false;
+ if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC)
+ return false;
+ return true;
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+}
+
+/*
+ * Returns a set of dentries for a file or dir.
+ *
+ * Note that this is a copy (dump) of dentries so that user should
+ * call write_entry_set() to apply changes made in this entry set
+ * to the real device.
+ *
+ * in:
+ * sb+p_dir+entry: indicates a file/dir
+ * type: specifies how many dentries should be included.
+ * out:
+ * file_ep: will point the first dentry(= file dentry) on success
+ * return:
+ * pointer of entry set on success,
+ * NULL on failure.
+ */
+struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
+ struct exfat_chain *p_dir, int entry, unsigned int type,
+ struct exfat_dentry **file_ep)
+{
+ int ret;
+ unsigned int off, byte_offset, clu = 0;
+ unsigned int entry_type;
+ sector_t sec;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct exfat_entry_set_cache *es = NULL;
+ struct exfat_dentry *ep, *pos;
+ unsigned char num_entries;
+ enum exfat_validate_dentry_mode mode = ES_MODE_STARTED;
+ struct buffer_head *bh;
+
+ /* FIXME : is available in error case? */
+ if (p_dir->dir == DIR_DELETED) {
+ exfat_msg(sb, KERN_ERR, "access to deleted dentry\n");
+ return NULL;
+ }
+
+ byte_offset = EXFAT_DEN_TO_B(entry);
+ ret = exfat_walk_fat_chain(sb, p_dir, byte_offset, &clu);
+ if (ret)
+ return NULL;
+
+ /* byte offset in cluster */
+ byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi);
+
+ /* byte offset in sector */
+ off = EXFAT_BLK_OFFSET(byte_offset, sb);
+
+ /* sector offset in cluster */
+ sec = EXFAT_B_TO_BLK(byte_offset, sb);
+ sec += exfat_cluster_to_sector(sbi, clu);
+
+ bh = sb_bread(sb, sec);
+ if (!bh)
+ goto err_out;
+
+ ep = (struct exfat_dentry *)(bh->b_data + off);
+ entry_type = exfat_get_entry_type(ep);
+
+ if (entry_type != TYPE_FILE && entry_type != TYPE_DIR)
+ goto err_out;
+
+ if (type == ES_ALL_ENTRIES)
+ num_entries = ep->file_num_ext + 1;
+ else
+ num_entries = type;
+
+ es = kmalloc(struct_size(es, entries, num_entries), GFP_KERNEL);
+ if (!es)
+ goto err_out;
+
+ es->num_entries = num_entries;
+ es->sector = sec;
+ es->offset = off;
+ es->alloc_flag = p_dir->flags;
+
+ pos = &es->entries[0];
+
+ while (num_entries) {
+ if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
+ goto err_out;
+
+ /* copy dentry */
+ memcpy(pos, ep, sizeof(struct exfat_dentry));
+
+ if (--num_entries == 0)
+ break;
+
+ if (((off + DENTRY_SIZE) & (sb->s_blocksize - 1)) <
+ (off & (sb->s_blocksize - 1))) {
+ /* get the next sector */
+ if (exfat_is_last_sector_in_cluster(sbi, sec)) {
+ if (es->alloc_flag == 0x03)
+ clu++;
+ else if (exfat_get_next_cluster(sb, &clu))
+ goto err_out;
+ sec = exfat_cluster_to_sector(sbi, clu);
+ } else {
+ sec++;
+ }
+
+ brelse(bh);
+ bh = sb_bread(sb, sec);
+ if (!bh)
+ goto err_out;
+ off = 0;
+ ep = (struct exfat_dentry *)bh->b_data;
+ } else {
+ ep++;
+ off += DENTRY_SIZE;
+ }
+ pos++;
+ }
+
+ if (file_ep)
+ *file_ep = &es->entries[0];
+ brelse(bh);
+
+ return es;
+err_out:
+ kfree(es);
+ brelse(bh);
+ return NULL;
+}
+
+static int exfat_extract_uni_name(struct exfat_dentry *ep,
+ unsigned short *uniname)
+{
+ int i, len = 0;
+
+ for (i = 0; i < 15; i++) {
+ *uniname = le16_to_cpu(ep->name_unicode[i]);
+ if (*uniname == 0x0)
+ return len;
+ uniname++;
+ len++;
+ }
+
+ *uniname = 0x0;
+ return len;
+
+}
+
+#define DIRENT_STEP_FILE (0)
+#define DIRENT_STEP_STRM (1)
+#define DIRENT_STEP_NAME (2)
+#define DIRENT_STEP_SECD (3)
+
+/*
+ * return values:
+ * >= 0 : return dir entiry position with the name in dir
+ * -EEXIST : (root dir, ".") it is the root dir itself
+ * -ENOENT : entry with the name does not exist
+ * -EIO : I/O error
+ */
+int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
+ struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
+ int num_entries, unsigned int type)
+{
+ int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len;
+ int order, step, name_len = 0;
+ int dentries_per_clu, num_empty = 0;
+ unsigned int entry_type;
+ unsigned short entry_uniname[16], *uniname = NULL, unichar;
+ struct exfat_chain *clu;
+ struct exfat_dentry *ep;
+ struct exfat_hint *hint_stat = &ei->hint_stat;
+ struct exfat_hint_femp candi_empty;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct buffer_head *bh = NULL;
+
+ dentries_per_clu = sbi->dentries_per_clu;
+
+ clu = exfat_chain_dup(p_dir);
+ if (!clu)
+ return -ENOMEM;
+
+ if (hint_stat->eidx) {
+ clu->dir = hint_stat->clu;
+ dentry = hint_stat->eidx;
+ end_eidx = dentry;
+ }
+
+ candi_empty.eidx = EXFAT_HINT_NONE;
+rewind:
+ order = 0;
+ step = DIRENT_STEP_FILE;
+ while (clu->dir != EOF_CLUSTER) {
+ i = dentry & (dentries_per_clu - 1);
+ for (; i < dentries_per_clu; i++, dentry++) {
+ if (rewind && dentry == end_eidx)
+ goto not_found;
+
+ ep = exfat_get_dentry(sb, clu, i, &bh, NULL);
+ if (!ep) {
+ kfree(clu);
+ return -EIO;
+ }
+
+ entry_type = exfat_get_entry_type(ep);
+
+ if (entry_type == TYPE_UNUSED ||
+ entry_type == TYPE_DELETED) {
+ step = DIRENT_STEP_FILE;
+
+ num_empty++;
+ if (candi_empty.eidx == EXFAT_HINT_NONE &&
+ num_empty == 1) {
+ exfat_chain_set(&candi_empty.cur,
+ clu->dir, clu->size,
+ clu->flags);
+ }
+
+ if (candi_empty.eidx == EXFAT_HINT_NONE &&
+ num_empty >= num_entries) {
+ candi_empty.eidx =
+ dentry - (num_empty - 1);
+ WARN_ON(candi_empty.eidx < 0);
+ candi_empty.count = num_empty;
+
+ if (ei->hint_femp.eidx ==
+ EXFAT_HINT_NONE ||
+ candi_empty.eidx <=
+ ei->hint_femp.eidx) {
+ memcpy(&ei->hint_femp,
+ &candi_empty,
+ sizeof(candi_empty));
+ }
+ }
+
+ brelse(bh);
+ if (entry_type == TYPE_UNUSED)
+ goto not_found;
+ continue;
+ }
+
+ num_empty = 0;
+ candi_empty.eidx = EXFAT_HINT_NONE;
+
+ if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) {
+ step = DIRENT_STEP_FILE;
+ if (type == TYPE_ALL || type == entry_type) {
+ num_ext = ep->file_num_ext;
+ step = DIRENT_STEP_STRM;
+ }
+ brelse(bh);
+ continue;
+ }
+
+ if (entry_type == TYPE_STREAM) {
+ unsigned short name_hash;
+
+ if (step != DIRENT_STEP_STRM) {
+ step = DIRENT_STEP_FILE;
+ brelse(bh);
+ continue;
+ }
+ step = DIRENT_STEP_FILE;
+ name_hash = le16_to_cpu(ep->stream_name_hash);
+ if (p_uniname->name_hash == name_hash &&
+ p_uniname->name_len ==
+ ep->stream_name_len) {
+ step = DIRENT_STEP_NAME;
+ order = 1;
+ name_len = 0;
+ }
+ brelse(bh);
+ continue;
+ }
+
+ brelse(bh);
+ if (entry_type == TYPE_EXTEND) {
+ if (step != DIRENT_STEP_NAME) {
+ step = DIRENT_STEP_FILE;
+ continue;
+ }
+
+ if (++order == 2)
+ uniname = p_uniname->name;
+ else
+ uniname += 15;
+
+ len = exfat_extract_uni_name(
+ ep, entry_uniname);
+ name_len += len;
+
+ unichar = *(uniname+len);
+ *(uniname+len) = 0x0;
+
+ if (exfat_nls_cmp_uniname(sb, uniname,
+ entry_uniname)) {
+ step = DIRENT_STEP_FILE;
+ } else if (name_len == p_uniname->name_len) {
+ if (order == num_ext)
+ goto found;
+ step = DIRENT_STEP_SECD;
+ }
+
+ *(uniname+len) = unichar;
+ continue;
+ }
+
+ if (entry_type &
+ (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) {
+ if (step == DIRENT_STEP_SECD) {
+ if (++order == num_ext)
+ goto found;
+ continue;
+ }
+ }
+ step = DIRENT_STEP_FILE;
+ }
+
+ if (clu->flags == 0x03) {
+ if (--clu->size > 0)
+ clu->dir++;
+ else
+ clu->dir = EOF_CLUSTER;
+ } else {
+ if (exfat_get_next_cluster(sb, &clu->dir)) {
+ kfree(clu);
+ return -EIO;
+ }
+ }
+ }
+
+not_found:
+ /*
+ * We started at not 0 index,so we should try to find target
+ * from 0 index to the index we started at.
+ */
+ if (!rewind && end_eidx) {
+ rewind = 1;
+ dentry = 0;
+ clu->dir = p_dir->dir;
+ /* reset empty hint */
+ num_empty = 0;
+ candi_empty.eidx = EXFAT_HINT_NONE;
+ goto rewind;
+ }
+
+ /* initialized hint_stat */
+ hint_stat->clu = p_dir->dir;
+ hint_stat->eidx = 0;
+ kfree(clu);
+ return -ENOENT;
+
+found:
+ /* next dentry we'll find is out of this cluster */
+ if (!((dentry + 1) & (dentries_per_clu - 1))) {
+ int ret = 0;
+
+ if (clu->flags == 0x03) {
+ if (--clu->size > 0)
+ clu->dir++;
+ else
+ clu->dir = EOF_CLUSTER;
+ } else {
+ ret = exfat_get_next_cluster(sb, &clu->dir);
+ }
+
+ if (ret || clu->dir != EOF_CLUSTER) {
+ /* just initialized hint_stat */
+ hint_stat->clu = p_dir->dir;
+ hint_stat->eidx = 0;
+ return (dentry - num_ext);
+ }
+ }
+
+ hint_stat->clu = clu->dir;
+ hint_stat->eidx = dentry + 1;
+ kfree(clu);
+ return dentry - num_ext;
+}
+
+int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
+ int entry, struct exfat_dentry *ep)
+{
+ int i, count = 0;
+ unsigned int type;
+ struct exfat_dentry *ext_ep;
+ struct buffer_head *bh;
+
+ for (i = 0, entry++; i < ep->file_num_ext; i++, entry++) {
+ ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh, NULL);
+ if (!ext_ep)
+ return -EIO;
+
+ type = exfat_get_entry_type(ext_ep);
+ brelse(bh);
+ if (type == TYPE_EXTEND || type == TYPE_STREAM)
+ count++;
+ else
+ return count;
+ }
+
+ return count;
+}
+
+void exfat_get_uniname_from_ext_entry(struct super_block *sb,
+ struct exfat_chain *p_dir, int entry, unsigned short *uniname)
+{
+ int i;
+ struct exfat_dentry *ep;
+ struct exfat_entry_set_cache *es;
+
+ es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES, &ep);
+ if (!es)
+ return;
+
+ if (es->num_entries < 3)
+ goto out;
+
+ ep += 2;
+
+ /*
+ * First entry : file entry
+ * Second entry : stream-extension entry
+ * Third entry : first file-name entry
+ * So, the index of first file-name dentry should start from 2.
+ */
+ for (i = 2; i < es->num_entries; i++, ep++) {
+ /* end of name entry */
+ if (exfat_get_entry_type(ep) != TYPE_EXTEND)
+ goto out;
+
+ exfat_extract_uni_name(ep, uniname);
+ uniname += 15;
+ }
+
+out:
+ kfree(es);
+}
+
+int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir)
+{
+ int i, count = 0;
+ int dentries_per_clu;
+ unsigned int entry_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;
+
+ clu = exfat_chain_dup(p_dir);
+
+ while (clu->dir != EOF_CLUSTER) {
+ for (i = 0; i < dentries_per_clu; i++) {
+ ep = exfat_get_dentry(sb, clu, i, &bh, NULL);
+ if (!ep) {
+ count = -EIO;
+ goto out;
+ }
+ entry_type = exfat_get_entry_type(ep);
+ brelse(bh);
+
+ if (entry_type == TYPE_UNUSED)
+ goto out;
+ if (entry_type != TYPE_DIR)
+ continue;
+ count++;
+ }
+
+ if (clu->flags == 0x03) {
+ if (--clu->size > 0)
+ clu->dir++;
+ else
+ clu->dir = EOF_CLUSTER;
+ } else {
+ if (exfat_get_next_cluster(sb, &(clu->dir))) {
+ count = -EIO;
+ goto out;
+ }
+ }
+ }
+out:
+ kfree(clu);
+ return count;
+}
--
2.17.1

2019-11-13 08:26:39

by Namjae Jeon

Subject: [PATCH 11/13] exfat: add Kconfig and Makefile

This adds the Kconfig and Makefile for exfat.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
---
fs/exfat/Kconfig | 21 +++++++++++++++++++++
fs/exfat/Makefile | 8 ++++++++
2 files changed, 29 insertions(+)
create mode 100644 fs/exfat/Kconfig
create mode 100644 fs/exfat/Makefile

diff --git a/fs/exfat/Kconfig b/fs/exfat/Kconfig
new file mode 100644
index 000000000000..11d841a5f7f0
--- /dev/null
+++ b/fs/exfat/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+config EXFAT
+ tristate "exFAT filesystem support"
+ select NLS
+ help
+ This allows you to mount devices formatted with the exFAT file system.
+ exFAT is typically used on SD-Cards or USB sticks.
+
+ To compile this as a module, choose M here: the module will be called
+ exfat.
+
+config EXFAT_FS_DEFAULT_IOCHARSET
+ string "Default iocharset for exFAT"
+ default "utf8"
+ depends on EXFAT
+ help
+ Set this to the default input/output character set you'd
+ like exFAT to use. It should probably match the character set
+ that most of your exFAT filesystems use, and can be overridden
+ with the "iocharset" mount option for exFAT filesystems.
diff --git a/fs/exfat/Makefile b/fs/exfat/Makefile
new file mode 100644
index 000000000000..e9193346c80c
--- /dev/null
+++ b/fs/exfat/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Makefile for the linux exFAT filesystem support.
+#
+obj-$(CONFIG_EXFAT) += exfat.o
+
+exfat-y := inode.o namei.o dir.o super.o fatent.o cache.o nls.o misc.o \
+ file.o balloc.o
--
2.17.1

2019-11-13 08:26:51

by Namjae Jeon

Subject: [PATCH 09/13] exfat: add misc operations

This adds the implementation of misc operations for exfat.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
---
fs/exfat/misc.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 247 insertions(+)
create mode 100644 fs/exfat/misc.c

diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c
new file mode 100644
index 000000000000..19a140355cf0
--- /dev/null
+++ b/fs/exfat/misc.c
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Written 1992,1993 by Werner Almesberger
+ * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
+ * and date_dos2unix for date==0 by Igor Zhbanov([email protected])
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+
+#include "exfat_raw.h"
+#include "exfat_fs.h"
+
+/*
+ * exfat_fs_error reports a file system problem that might indicate fa data
+ * corruption/inconsistency. Depending on 'errors' mount option the
+ * panic() is called, or error message is printed FAT and nothing is done,
+ * or filesystem is remounted read-only (default behavior).
+ * In case the file system is remounted read-only, it can be made writable
+ * again by remounting it.
+ */
+void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
+{
+ struct exfat_mount_options *opts = &EXFAT_SB(sb)->options;
+ va_list args;
+ struct va_format vaf;
+
+ if (report) {
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ exfat_msg(sb, KERN_ERR, "error, %pV\n", &vaf);
+ va_end(args);
+ }
+
+ if (opts->errors == EXFAT_ERRORS_PANIC) {
+ panic("exFAT-fs (%s): fs panic from previous error\n",
+ sb->s_id);
+ } else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) {
+ sb->s_flags |= SB_RDONLY;
+ exfat_msg(sb, KERN_ERR, "Filesystem has been set read-only");
+ }
+}
+
+/*
+ * exfat_msg() - print preformated EXFAT specific messages.
+ * All logs except what uses exfat_fs_error() should be written by exfat_msg()
+ */
+void exfat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ /* level means KERN_ pacility level */
+ printk("%sexFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);
+ va_end(args);
+}
+
+/* <linux/time.h> externs sys_tz
+ * extern struct timezone sys_tz;
+ */
+#define UNIX_SECS_1980 315532800L
+
+#if BITS_PER_LONG == 64
+#define UNIX_SECS_2108 4354819200L
+#endif
+
+/* days between 1970/01/01 and 1980/01/01 (2 leap days) */
+#define DAYS_DELTA_DECADE (365 * 10 + 2)
+/* 120 (2100 - 1980) isn't leap year */
+#define NO_LEAP_YEAR_2100 (120)
+#define IS_LEAP_YEAR(y) (!((y) & 0x3) && (y) != NO_LEAP_YEAR_2100)
+
+#define SECS_PER_MIN (60)
+#define SECS_PER_HOUR (60 * SECS_PER_MIN)
+#define SECS_PER_DAY (24 * SECS_PER_HOUR)
+
+#define MAKE_LEAP_YEAR(leap_year, year) \
+ do { \
+ /* 2100 isn't leap year */ \
+ if (unlikely(year > NO_LEAP_YEAR_2100)) \
+ leap_year = ((year + 3) / 4) - 1; \
+ else \
+ leap_year = ((year + 3) / 4); \
+ } while (0)
+
+/* Linear day numbers of the respective 1sts in non-leap years. */
+static time_t accum_days_in_year[] = {
+ /* Month : N 01 02 03 04 05 06 07 08 09 10 11 12 */
+ 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
+};
+
+/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
+void exfat_time_fat2unix(struct exfat_sb_info *sbi, struct timespec64 *ts,
+ struct exfat_date_time *tp)
+{
+ time_t year = tp->year;
+ time_t ld; /* leap day */
+
+ MAKE_LEAP_YEAR(ld, year);
+
+ if (IS_LEAP_YEAR(year) && (tp->month) > 2)
+ ld++;
+
+ ts->tv_sec = tp->second + tp->minute * SECS_PER_MIN
+ + tp->hour * SECS_PER_HOUR
+ + (year * 365 + ld + accum_days_in_year[tp->month]
+ + (tp->day - 1) + DAYS_DELTA_DECADE) * SECS_PER_DAY;
+
+ if (!sbi->options.tz_utc)
+ ts->tv_sec += sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+ ts->tv_nsec = 0;
+}
+
+/* Convert linear UNIX date to a FAT time/date pair. */
+void exfat_time_unix2fat(struct exfat_sb_info *sbi, struct timespec64 *ts,
+ struct exfat_date_time *tp)
+{
+ time_t second = ts->tv_sec;
+ time_t day, month, year;
+ time_t ld; /* leap day */
+
+ if (!sbi->options.tz_utc)
+ second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+ /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
+ if (second < UNIX_SECS_1980) {
+ tp->second = 0;
+ tp->minute = 0;
+ tp->hour = 0;
+ tp->day = 1;
+ tp->month = 1;
+ tp->year = 0;
+ return;
+ }
+#if (BITS_PER_LONG == 64)
+ if (second >= UNIX_SECS_2108) {
+ tp->second = 59;
+ tp->minute = 59;
+ tp->hour = 23;
+ tp->day = 31;
+ tp->month = 12;
+ tp->year = 127;
+ return;
+ }
+#endif
+
+ day = second / SECS_PER_DAY - DAYS_DELTA_DECADE;
+ year = day / 365;
+
+ MAKE_LEAP_YEAR(ld, year);
+ if (year * 365 + ld > day)
+ year--;
+
+ MAKE_LEAP_YEAR(ld, year);
+ day -= year * 365 + ld;
+
+ if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) {
+ month = 2;
+ } else {
+ if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3])
+ day--;
+ for (month = 1; month < 12; month++) {
+ if (accum_days_in_year[month + 1] > day)
+ break;
+ }
+ }
+ day -= accum_days_in_year[month];
+
+ tp->second = second % SECS_PER_MIN;
+ tp->minute = (second / SECS_PER_MIN) % 60;
+ tp->hour = (second / SECS_PER_HOUR) % 24;
+ tp->day = day + 1;
+ tp->month = month;
+ tp->year = year;
+}
+
+struct exfat_timestamp *exfat_tm_now(struct exfat_sb_info *sbi,
+ struct exfat_timestamp *tp)
+{
+ struct timespec64 ts;
+ struct exfat_date_time dt;
+
+ ktime_get_real_ts64(&ts);
+ exfat_time_unix2fat(sbi, &ts, &dt);
+
+ tp->year = dt.year;
+ tp->mon = dt.month;
+ tp->day = dt.day;
+ tp->hour = dt.hour;
+ tp->min = dt.minute;
+ tp->sec = dt.second;
+
+ return tp;
+}
+
+unsigned short exfat_calc_chksum_2byte(void *data, int len,
+ unsigned short chksum, int type)
+{
+ int i;
+ unsigned char *c = (unsigned char *)data;
+
+ for (i = 0; i < len; i++, c++) {
+ if (((i == 2) || (i == 3)) && (type == CS_DIR_ENTRY))
+ continue;
+ chksum = (((chksum & 1) << 15) | ((chksum & 0xFFFE) >> 1)) +
+ (unsigned short)*c;
+ }
+ return chksum;
+}
+
+void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync)
+{
+ WRITE_ONCE(EXFAT_SB(sb)->s_dirt, true);
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+
+ if (sync)
+ sync_dirty_buffer(bh);
+}
+
+void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
+ unsigned int size, unsigned char flags)
+{
+ ec->dir = dir;
+ ec->size = size;
+ ec->flags = flags;
+}
+
+struct exfat_chain *exfat_chain_dup(struct exfat_chain *ec)
+{
+ struct exfat_chain *dup;
+
+ dup = kmalloc(sizeof(struct exfat_chain), GFP_KERNEL);
+ if (!dup)
+ return NULL;
+
+ exfat_chain_set(dup, ec->dir, ec->size, ec->flags);
+ return dup;
+}
--
2.17.1

2019-11-13 08:26:57

by Namjae Jeon

Subject: [PATCH 06/13] exfat: add exfat entry operations

This adds the implementation of exfat entry operations for exfat.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
---
fs/exfat/fatent.c | 475 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 475 insertions(+)
create mode 100644 fs/exfat/fatent.c

diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c
new file mode 100644
index 000000000000..006c513ae5c0
--- /dev/null
+++ b/fs/exfat/fatent.c
@@ -0,0 +1,475 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+#include <linux/buffer_head.h>
+
+#include "exfat_raw.h"
+#include "exfat_fs.h"
+
+static int __exfat_ent_get(struct super_block *sb, unsigned int loc,
+ unsigned int *content)
+{
+ unsigned int off, _content;
+ sector_t sec;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct buffer_head *bh;
+
+ sec = sbi->FAT1_start_sector + (loc >> (sb->s_blocksize_bits-2));
+ off = (loc << 2) & (sb->s_blocksize - 1);
+
+ bh = sb_bread(sb, sec);
+ if (!bh)
+ return -EIO;
+
+ _content = le32_to_cpu(*(__le32 *)(&bh->b_data[off]));
+
+ /* remap reserved clusters to simplify code */
+ if (_content >= CLUSTER_32(0xFFFFFFF8))
+ _content = EOF_CLUSTER;
+
+ *content = CLUSTER_32(_content);
+ brelse(bh);
+ return 0;
+}
+
+int exfat_ent_set(struct super_block *sb, unsigned int loc,
+ unsigned int content)
+{
+ unsigned int off;
+ sector_t sec;
+ __le32 *fat_entry;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct buffer_head *bh;
+
+ sec = sbi->FAT1_start_sector + (loc >> (sb->s_blocksize_bits-2));
+ off = (loc << 2) & (sb->s_blocksize - 1);
+
+ bh = sb_bread(sb, sec);
+ if (!bh)
+ return -EIO;
+
+ fat_entry = (__le32 *)&(bh->b_data[off]);
+ *fat_entry = cpu_to_le32(content);
+ exfat_update_bh(sb, bh, sb->s_flags & SB_SYNCHRONOUS);
+ exfat_mirror_bh(sb, sec, bh);
+ brelse(bh);
+ return 0;
+}
+
+static inline bool is_reserved_cluster(unsigned int clus)
+{
+ if (clus == FREE_CLUSTER || clus == EOF_CLUSTER || clus == BAD_CLUSTER)
+ return true;
+ return false;
+}
+
+static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
+ unsigned int clus)
+{
+ if (clus < BASE_CLUSTER || sbi->num_clusters <= clus)
+ return false;
+ return true;
+}
+
+int exfat_ent_get(struct super_block *sb, unsigned int loc,
+ unsigned int *content)
+{
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ int err;
+
+ if (!is_valid_cluster(sbi, loc)) {
+ exfat_fs_error(sb, "invalid access to FAT (entry 0x%08x)",
+ loc);
+ return -EIO;
+ }
+
+ err = __exfat_ent_get(sb, loc, content);
+ if (err) {
+ exfat_fs_error(sb,
+ "failed to access to FAT (entry 0x%08x, err:%d)",
+ loc, err);
+ return err;
+ }
+
+ if (!is_reserved_cluster(*content) &&
+ !is_valid_cluster(sbi, *content)) {
+ exfat_fs_error(sb,
+ "invalid access to FAT (entry 0x%08x) bogus content (0x%08x)",
+ loc, *content);
+ return -EIO;
+ }
+
+ if (*content == FREE_CLUSTER) {
+ exfat_fs_error(sb,
+ "invalid access to FAT free cluster (entry 0x%08x)",
+ loc);
+ return -EIO;
+ }
+
+ if (*content == BAD_CLUSTER) {
+ exfat_fs_error(sb,
+ "invalid access to FAT bad cluster (entry 0x%08x)",
+ loc);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
+ unsigned int len)
+{
+ if (!len)
+ return 0;
+
+ while (len > 1) {
+ if (exfat_ent_set(sb, chain, chain + 1))
+ return -EIO;
+ chain++;
+ len--;
+ }
+
+ if (exfat_ent_set(sb, chain, EOF_CLUSTER))
+ return -EIO;
+ return 0;
+}
+
+int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain)
+{
+ unsigned int num_clusters = 0;
+ unsigned int clu;
+ struct super_block *sb = inode->i_sb;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+ /* invalid cluster number */
+ if (p_chain->dir == FREE_CLUSTER || p_chain->dir == EOF_CLUSTER)
+ return 0;
+
+ /* no cluster to truncate */
+ if (p_chain->size == 0)
+ return 0;
+
+ /* check cluster validation */
+ if (p_chain->dir < 2 && p_chain->dir >= sbi->num_clusters) {
+ exfat_msg(sb, KERN_ERR, "invalid start cluster (%u)",
+ p_chain->dir);
+ return -EIO;
+ }
+
+ WRITE_ONCE(sbi->s_dirt, true);
+ clu = p_chain->dir;
+
+ if (p_chain->flags == 0x03) {
+ do {
+ exfat_clear_bitmap(inode, clu-2);
+ clu++;
+
+ num_clusters++;
+ } while (num_clusters < p_chain->size);
+ } else {
+ do {
+ exfat_clear_bitmap(inode, (clu - BASE_CLUSTER));
+
+ if (exfat_get_next_cluster(sb, &clu))
+ goto out;
+
+ num_clusters++;
+ } while (clu != EOF_CLUSTER);
+ }
+
+out:
+ sbi->used_clusters -= num_clusters;
+ return 0;
+}
+
+int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
+ unsigned int *ret_clu)
+{
+ unsigned int clu, next;
+ unsigned int count = 0;
+
+ next = p_chain->dir;
+ if (p_chain->flags == 0x03) {
+ *ret_clu = next + p_chain->size - 1;
+ return 0;
+ }
+
+ do {
+ count++;
+ clu = next;
+ if (exfat_ent_get(sb, clu, &next))
+ return -EIO;
+ } while (next != EOF_CLUSTER);
+
+ if (p_chain->size != count) {
+ exfat_fs_error(sb,
+ "bogus directory size (clus : ondisk(%d) != counted(%d))",
+ p_chain->size, count);
+ return -EIO;
+ }
+
+ *ret_clu = clu;
+ return 0;
+}
+
+static inline int exfat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
+{
+ int i, err = 0;
+
+ for (i = 0; i < nr_bhs; i++)
+ write_dirty_buffer(bhs[i], 0);
+
+ for (i = 0; i < nr_bhs; i++) {
+ wait_on_buffer(bhs[i]);
+ if (!err && !buffer_uptodate(bhs[i]))
+ err = -EIO;
+ }
+ return err;
+}
+
+int exfat_zeroed_cluster(struct inode *dir, unsigned int clu)
+{
+ struct super_block *sb = dir->i_sb;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ struct buffer_head *bhs[MAX_BUF_PER_PAGE];
+ int nr_bhs = MAX_BUF_PER_PAGE;
+ sector_t blknr, last_blknr;
+ int err, i, n;
+
+ blknr = exfat_cluster_to_sector(sbi, clu);
+ last_blknr = blknr + sbi->sect_per_clus;
+
+ if (last_blknr > sbi->num_sectors && sbi->num_sectors > 0) {
+ exfat_fs_error_ratelimit(sb,
+ "%s: out of range(sect:%llu len:%u)",
+ __func__, (unsigned long long)blknr,
+ sbi->sect_per_clus);
+ return -EIO;
+ }
+
+ /* Zeroing the unused blocks on this cluster */
+ n = 0;
+ while (blknr < last_blknr) {
+ bhs[n] = sb_getblk(sb, blknr);
+ if (!bhs[n]) {
+ err = -ENOMEM;
+ goto error;
+ }
+ memset(bhs[n]->b_data, 0, sb->s_blocksize);
+ exfat_update_bh(sb, bhs[n], 0);
+
+ n++;
+ blknr++;
+
+ if (n == nr_bhs) {
+ if (IS_DIRSYNC(dir)) {
+ err = exfat_sync_bhs(bhs, n);
+ if (err)
+ goto error;
+ }
+
+ for (i = 0; i < n; i++)
+ brelse(bhs[i]);
+ n = 0;
+ }
+ }
+
+ if (IS_DIRSYNC(dir)) {
+ err = exfat_sync_bhs(bhs, n);
+ if (err)
+ goto error;
+ }
+
+ for (i = 0; i < n; i++)
+ brelse(bhs[i]);
+
+ return 0;
+
+error:
+ exfat_msg(sb, KERN_ERR, "failed zeroed sect %llu\n",
+ (unsigned long long)blknr);
+ for (i = 0; i < n; i++)
+ bforget(bhs[i]);
+
+ return err;
+}
+
+int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
+ struct exfat_chain *p_chain)
+{
+ int ret = -ENOSPC;
+ unsigned int num_clusters = 0, total_cnt;
+ unsigned int hint_clu, new_clu, last_clu = EOF_CLUSTER;
+ struct super_block *sb = inode->i_sb;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+ total_cnt = sbi->num_clusters - BASE_CLUSTER;
+
+ if (unlikely(total_cnt < sbi->used_clusters)) {
+ exfat_fs_error_ratelimit(sb,
+ "%s: invalid used clusters(t:%u,u:%u)\n",
+ __func__, total_cnt, sbi->used_clusters);
+ return -EIO;
+ }
+
+ if (num_alloc > total_cnt - sbi->used_clusters)
+ return -ENOSPC;
+
+ hint_clu = p_chain->dir;
+ /* find new cluster */
+ if (hint_clu == EOF_CLUSTER) {
+ if (sbi->clu_srch_ptr < BASE_CLUSTER) {
+ exfat_msg(sb, KERN_ERR,
+ "sbi->clu_srch_ptr is invalid (%u)\n",
+ sbi->clu_srch_ptr);
+ sbi->clu_srch_ptr = BASE_CLUSTER;
+ }
+
+ hint_clu = exfat_test_bitmap(sb,
+ sbi->clu_srch_ptr - BASE_CLUSTER);
+ if (hint_clu == EOF_CLUSTER)
+ return -ENOSPC;
+ }
+
+ /* check cluster validation */
+ if (hint_clu < BASE_CLUSTER && hint_clu >= sbi->num_clusters) {
+ exfat_msg(sb, KERN_ERR, "hint_cluster is invalid (%u)\n",
+ hint_clu);
+ hint_clu = BASE_CLUSTER;
+ if (p_chain->flags == 0x03) {
+ if (exfat_chain_cont_cluster(sb, p_chain->dir,
+ num_clusters))
+ return -EIO;
+ p_chain->flags = 0x01;
+ }
+ }
+
+ WRITE_ONCE(sbi->s_dirt, true);
+
+ p_chain->dir = EOF_CLUSTER;
+
+ while ((new_clu = exfat_test_bitmap(sb,
+ hint_clu - BASE_CLUSTER)) != EOF_CLUSTER) {
+ if (new_clu != hint_clu && p_chain->flags == 0x03) {
+ if (exfat_chain_cont_cluster(sb, p_chain->dir,
+ num_clusters)) {
+ ret = -EIO;
+ goto error;
+ }
+ p_chain->flags = 0x01;
+ }
+
+ /* update allocation bitmap */
+ if (exfat_set_bitmap(inode, new_clu - BASE_CLUSTER)) {
+ ret = -EIO;
+ goto error;
+ }
+
+ num_clusters++;
+
+ /* update FAT table */
+ if (p_chain->flags == 0x01) {
+ if (exfat_ent_set(sb, new_clu, EOF_CLUSTER)) {
+ ret = -EIO;
+ goto error;
+ }
+ }
+
+ if (p_chain->dir == EOF_CLUSTER) {
+ p_chain->dir = new_clu;
+ } else if (p_chain->flags == 0x01) {
+ if (exfat_ent_set(sb, last_clu, new_clu)) {
+ ret = -EIO;
+ goto error;
+ }
+ }
+ last_clu = new_clu;
+
+ if (--num_alloc == 0) {
+ sbi->clu_srch_ptr = hint_clu;
+ sbi->used_clusters += num_clusters;
+
+ p_chain->size += num_clusters;
+ return 0;
+ }
+
+ hint_clu = new_clu + 1;
+ if (hint_clu >= sbi->num_clusters) {
+ hint_clu = BASE_CLUSTER;
+
+ if (p_chain->flags == 0x03) {
+ if (exfat_chain_cont_cluster(sb, p_chain->dir,
+ num_clusters)) {
+ ret = -EIO;
+ goto error;
+ }
+ p_chain->flags = 0x01;
+ }
+ }
+ }
+error:
+ if (num_clusters)
+ exfat_free_cluster(inode, p_chain);
+ return ret;
+}
+
+int exfat_count_num_clusters(struct super_block *sb,
+ struct exfat_chain *p_chain, unsigned int *ret_count)
+{
+ unsigned int i, count;
+ unsigned int clu;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+ if (!p_chain->dir || p_chain->dir == EOF_CLUSTER) {
+ *ret_count = 0;
+ return 0;
+ }
+
+ if (p_chain->flags == 0x03) {
+ *ret_count = p_chain->size;
+ return 0;
+ }
+
+ clu = p_chain->dir;
+ count = 0;
+ for (i = BASE_CLUSTER; i < sbi->num_clusters; i++) {
+ count++;
+ if (exfat_ent_get(sb, clu, &clu))
+ return -EIO;
+ if (clu == EOF_CLUSTER)
+ break;
+ }
+
+ *ret_count = count;
+ return 0;
+}
+
+int exfat_mirror_bh(struct super_block *sb, sector_t sec,
+ struct buffer_head *bh)
+{
+ struct buffer_head *c_bh;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ sector_t sec2;
+ int err = 0;
+
+ if (sbi->FAT2_start_sector != sbi->FAT1_start_sector) {
+ sec2 = sec - sbi->FAT1_start_sector + sbi->FAT2_start_sector;
+ c_bh = sb_getblk(sb, sec2);
+ if (!c_bh) {
+ err = -ENOMEM;
+ goto out;
+ }
+ memcpy(c_bh->b_data, bh->b_data, sb->s_blocksize);
+ set_buffer_uptodate(c_bh);
+ mark_buffer_dirty(c_bh);
+ if (sb->s_flags & SB_SYNCHRONOUS)
+ err = sync_dirty_buffer(c_bh);
+ brelse(c_bh);
+ }
+out:
+ return err;
+}
--
2.17.1

2019-11-13 08:27:56

by Namjae Jeon

Subject: [PATCH 05/13] exfat: add file operations

This adds the implementation of file operations for exfat.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
---
fs/exfat/file.c | 346 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 346 insertions(+)
create mode 100644 fs/exfat/file.c

diff --git a/fs/exfat/file.c b/fs/exfat/file.c
new file mode 100644
index 000000000000..5afd65a36eb5
--- /dev/null
+++ b/fs/exfat/file.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/slab.h>
+#include <linux/cred.h>
+#include <linux/buffer_head.h>
+
+#include "exfat_raw.h"
+#include "exfat_fs.h"
+
+static int exfat_cont_expand(struct inode *inode, loff_t size)
+{
+ struct address_space *mapping = inode->i_mapping;
+ loff_t start = i_size_read(inode), count = size - i_size_read(inode);
+ int err, err2;
+
+ err = generic_cont_expand_simple(inode, size);
+ if (err)
+ return err;
+
+ inode->i_ctime = inode->i_mtime = current_time(inode);
+ mark_inode_dirty(inode);
+
+ if (!IS_SYNC(inode))
+ return 0;
+
+ err = filemap_fdatawrite_range(mapping, start, start + count - 1);
+ err2 = sync_mapping_buffers(mapping);
+ if (!err)
+ err = err2;
+ err2 = write_inode_now(inode, 1);
+ if (!err)
+ err = err2;
+ if (err)
+ return err;
+
+ return filemap_fdatawait_range(mapping, start, start + count - 1);
+}
+
+static int exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
+{
+ mode_t allow_utime = sbi->options.allow_utime;
+
+ if (!uid_eq(current_fsuid(), inode->i_uid)) {
+ if (in_group_p(inode->i_gid))
+ allow_utime >>= 3;
+ if (allow_utime & MAY_WRITE)
+ return 1;
+ }
+
+ /* use a default check */
+ return 0;
+}
+
+static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
+ struct inode *inode, umode_t *mode_ptr)
+{
+ mode_t i_mode, mask, perm;
+
+ i_mode = inode->i_mode;
+
+ if (S_ISREG(i_mode) || S_ISLNK(i_mode))
+ mask = sbi->options.fs_fmask;
+ else
+ mask = sbi->options.fs_dmask;
+
+ perm = *mode_ptr & ~(S_IFMT | mask);
+
+ /* Of the r and x bits, all (subject to umask) must be present.*/
+ if ((perm & 0555) != (i_mode & 0555))
+ return -EPERM;
+
+ if (exfat_mode_can_hold_ro(inode)) {
+ /*
+ * Of the w bits, either all (subject to umask) or none must
+ * be present.
+ */
+ if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
+ return -EPERM;
+ } else {
+ /*
+ * If exfat_mode_can_hold_ro(inode) is false, can't change
+ * w bits.
+ */
+ if ((perm & 0222) != (0222 & ~mask))
+ return -EPERM;
+ }
+
+ *mode_ptr &= S_IFMT | perm;
+
+ return 0;
+}
+
+/* resize the file length */
+int __exfat_truncate(struct inode *inode, loff_t new_size)
+{
+ unsigned int num_clusters_new, num_clusters_phys;
+ unsigned int last_clu = FREE_CLUSTER;
+ struct exfat_chain clu;
+ struct exfat_timestamp tm;
+ struct exfat_dentry *ep, *ep2;
+ 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_entry_set_cache *es = NULL;
+ int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0;
+
+ /* check if the given file ID is opened */
+ if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
+ return -EPERM;
+
+ exfat_set_vol_flags(sb, VOL_DIRTY);
+
+ num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
+ num_clusters_phys =
+ EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi);
+
+ exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
+
+ if (new_size > 0) {
+ /*
+ * Truncate FAT chain num_clusters after the first cluster
+ * num_clusters = min(new, phys);
+ */
+ unsigned int num_clusters =
+ min(num_clusters_new, num_clusters_phys);
+
+ /*
+ * Follow FAT chain
+ * (defensive coding - works fine even with corrupted FAT table
+ */
+ if (clu.flags == 0x03) {
+ clu.dir += num_clusters;
+ clu.size -= num_clusters;
+ } else {
+ while (num_clusters > 0) {
+ last_clu = clu.dir;
+ if (exfat_get_next_cluster(sb, &(clu.dir)))
+ return -EIO;
+
+ num_clusters--;
+ clu.size--;
+ }
+ }
+ } else {
+ ei->flags = 0x03;
+ ei->start_clu = EOF_CLUSTER;
+ }
+
+ i_size_write(inode, new_size);
+
+ if (ei->type == TYPE_FILE)
+ ei->attr |= ATTR_ARCHIVE;
+
+ /* update the directory entry */
+ if (!evict) {
+ es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
+ ES_ALL_ENTRIES, &ep);
+ if (!es)
+ return -EIO;
+ ep2 = ep + 1;
+
+ exfat_set_entry_time(ep, exfat_tm_now(EXFAT_SB(sb), &tm),
+ TM_MODIFY);
+ ep->file_attr = cpu_to_le16(ei->attr);
+
+ /* File size should be zero if there is no cluster allocated */
+ if (ei->start_clu == EOF_CLUSTER)
+ ep->stream_valid_size = ep->stream_size = 0;
+ else {
+ ep->stream_valid_size = cpu_to_le64(new_size);
+ ep->stream_size = ep->stream_valid_size;
+ }
+
+ if (new_size == 0) {
+ /* Any directory can not be truncated to zero */
+ WARN_ON(ei->type != TYPE_FILE);
+
+ ep2->stream_flags = 0x01;
+ ep2->stream_start_clu = FREE_CLUSTER;
+ }
+
+ if (exfat_update_dir_chksum_with_entry_set(sb, es,
+ inode_needs_sync(inode)))
+ return -EIO;
+ kfree(es);
+ }
+
+ /* cut off from the FAT chain */
+ if (ei->flags == 0x01 && last_clu != FREE_CLUSTER &&
+ last_clu != EOF_CLUSTER) {
+ if (exfat_ent_set(sb, last_clu, EOF_CLUSTER))
+ return -EIO;
+ }
+
+ /* invalidate cache and free the clusters */
+ /* clear exfat cache */
+ exfat_cache_inval_inode(inode);
+
+ /* hint information */
+ ei->hint_bmap.off = EOF_CLUSTER;
+ ei->hint_bmap.clu = EOF_CLUSTER;
+ if (ei->rwoffset > new_size)
+ ei->rwoffset = new_size;
+
+ /* hint_stat will be used if this is directory. */
+ ei->hint_stat.eidx = 0;
+ ei->hint_stat.clu = ei->start_clu;
+ ei->hint_femp.eidx = EXFAT_HINT_NONE;
+
+ /* free the clusters */
+ if (exfat_free_cluster(inode, &clu))
+ return -EIO;
+
+ exfat_set_vol_flags(sb, VOL_CLEAN);
+
+ return 0;
+}
+
+void exfat_truncate(struct inode *inode, loff_t size)
+{
+ struct super_block *sb = inode->i_sb;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ unsigned int blocksize = 1 << inode->i_blkbits;
+ loff_t aligned_size;
+ int err;
+
+ mutex_lock(&sbi->s_lock);
+ if (EXFAT_I(inode)->start_clu == 0) {
+ /*
+ * Empty start_clu != ~0 (not allocated)
+ */
+ exfat_fs_error(sb, "tried to truncate zeroed cluster.");
+ goto out;
+ }
+
+ err = __exfat_truncate(inode, i_size_read(inode));
+ if (err)
+ goto out;
+
+ inode->i_ctime = inode->i_mtime = current_time(inode);
+ if (IS_DIRSYNC(inode))
+ exfat_sync_inode(inode);
+ else
+ mark_inode_dirty(inode);
+
+ inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
+ ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
+out:
+ aligned_size = i_size_read(inode);
+ if (aligned_size & (blocksize - 1)) {
+ aligned_size |= (blocksize - 1);
+ aligned_size++;
+ }
+
+ if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode))
+ EXFAT_I(inode)->i_size_ondisk = aligned_size;
+
+ if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode))
+ EXFAT_I(inode)->i_size_aligned = aligned_size;
+ mutex_unlock(&sbi->s_lock);
+}
+
+int exfat_getattr(const struct path *path, struct kstat *stat,
+ unsigned int request_mask, unsigned int query_flags)
+{
+ struct inode *inode = d_backing_inode(path->dentry);
+
+ generic_fillattr(inode, stat);
+ stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
+ return 0;
+}
+
+int exfat_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
+ struct inode *inode = dentry->d_inode;
+ unsigned int ia_valid;
+ int error;
+
+ if ((attr->ia_valid & ATTR_SIZE) &&
+ attr->ia_size > i_size_read(inode)) {
+ error = exfat_cont_expand(inode, attr->ia_size);
+ if (error || attr->ia_valid == ATTR_SIZE)
+ return error;
+ attr->ia_valid &= ~ATTR_SIZE;
+ }
+
+ /* Check for setting the inode time. */
+ ia_valid = attr->ia_valid;
+ if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
+ exfat_allow_set_time(sbi, inode)) {
+ attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
+ ATTR_TIMES_SET);
+ }
+
+ error = setattr_prepare(dentry, attr);
+ attr->ia_valid = ia_valid;
+ if (error)
+ return error;
+
+ if (((attr->ia_valid & ATTR_UID) &&
+ !uid_eq(attr->ia_uid, sbi->options.fs_uid)) ||
+ ((attr->ia_valid & ATTR_GID) &&
+ !gid_eq(attr->ia_gid, sbi->options.fs_gid)) ||
+ ((attr->ia_valid & ATTR_MODE) &&
+ (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777))))
+ return -EPERM;
+
+ /*
+ * We don't return -EPERM here. Yes, strange, but this is too
+ * old behavior.
+ */
+ if (attr->ia_valid & ATTR_MODE) {
+ if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
+ attr->ia_valid &= ~ATTR_MODE;
+ }
+
+ if (attr->ia_valid & ATTR_SIZE) {
+ down_write(&EXFAT_I(inode)->truncate_lock);
+ truncate_setsize(inode, attr->ia_size);
+ exfat_truncate(inode, attr->ia_size);
+ up_write(&EXFAT_I(inode)->truncate_lock);
+ }
+
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+
+ return error;
+}
+
+const struct file_operations exfat_file_operations = {
+ .llseek = generic_file_llseek,
+ .read_iter = generic_file_read_iter,
+ .write_iter = generic_file_write_iter,
+ .mmap = generic_file_mmap,
+ .fsync = generic_file_fsync,
+ .splice_read = generic_file_splice_read,
+};
+
+const struct inode_operations exfat_file_inode_operations = {
+ .setattr = exfat_setattr,
+ .getattr = exfat_getattr,
+};
--
2.17.1

2019-11-13 19:26:05

by Valdis Klētnieks

Subject: Re: [PATCH 00/13] add the latest exfat driver

On Wed, 13 Nov 2019 03:17:47 -0500, Namjae Jeon said:
> This adds the latest Samsung exfat driver to fs/exfat. This is an
> implementation of the Microsoft exFAT specification. Previous versions
> of this shipped with millions of Android phones, an a random previous
> snaphot has been merged in drivers/staging/.
>
> Compared to the sdfat driver shipped on the phones the following changes
> have been made:
>
> - the support for vfat has been removed as that is already supported
> by fs/fat
> - driver has been renamed to exfat
> - the code has been refactored and clean up to fully integrate into
> the upstream Linux version and follow the Linux coding style
> - metadata operations like create, lookup and readdir have been further
> optimized
> - various major and minor bugs have been fixed
>
> We plan to treat this version as the future upstream for the code base
> once merged, and all new features and bug fixes will go upstream first.

For the record, I'm totally OK with this and glad to see more up-to-date code
than the codebase I was working from.

Attachments:

2019-11-13 21:02:31

by Eric Sandeen

Subject: Re: [PATCH 00/13] add the latest exfat driver

On 11/13/19 2:17 AM, Namjae Jeon wrote:
> This adds the latest Samsung exfat driver to fs/exfat. This is an
> implementation of the Microsoft exFAT specification. Previous versions
> of this shipped with millions of Android phones, an a random previous
> snaphot has been merged in drivers/staging/.
>
> Compared to the sdfat driver shipped on the phones the following changes
> have been made:
>
> - the support for vfat has been removed as that is already supported
> by fs/fat
> - driver has been renamed to exfat
> - the code has been refactored and clean up to fully integrate into
> the upstream Linux version and follow the Linux coding style
> - metadata operations like create, lookup and readdir have been further
> optimized
> - various major and minor bugs have been fixed
>
> We plan to treat this version as the future upstream for the code base
> once merged, and all new features and bug fixes will go upstream first.

Apologies if I should know this already, but where are the userspace tools
for exfat located?

Thanks,
-Eric

2019-11-13 21:56:45

by Valdis Klētnieks

Subject: Re: [PATCH 00/13] add the latest exfat driver

On Wed, 13 Nov 2019 15:00:23 -0600, Eric Sandeen said:
> On 11/13/19 2:17 AM, Namjae Jeon wrote:
> > This adds the latest Samsung exfat driver to fs/exfat. This is an
> > implementation of the Microsoft exFAT specification. Previous versions
> > of this shipped with millions of Android phones, an a random previous
> > snaphot has been merged in drivers/staging/.
> >
> > Compared to the sdfat driver shipped on the phones the following changes
> > have been made:
> >
> > - the support for vfat has been removed as that is already supported
> > by fs/fat
> > - driver has been renamed to exfat
> > - the code has been refactored and clean up to fully integrate into
> > the upstream Linux version and follow the Linux coding style
> > - metadata operations like create, lookup and readdir have been further
> > optimized
> > - various major and minor bugs have been fixed
> >
> > We plan to treat this version as the future upstream for the code base
> > once merged, and all new features and bug fixes will go upstream first.
>
> Apologies if I should know this already, but where are the userspace tools
> for exfat located?

The upstream for that is https://github.com/relan/exfat

On Fedora, they're available in the rpmfusion RPM 'exfat-utils', not sure where
Ubuntu or other distros put it.

Attachments:

2019-11-13 22:01:06

by Eric Sandeen

Subject: Re: [PATCH 00/13] add the latest exfat driver

On 11/13/19 3:55 PM, Valdis Klētnieks wrote:
> On Wed, 13 Nov 2019 15:00:23 -0600, Eric Sandeen said:
>> On 11/13/19 2:17 AM, Namjae Jeon wrote:
>>> This adds the latest Samsung exfat driver to fs/exfat. This is an
>>> implementation of the Microsoft exFAT specification. Previous versions
>>> of this shipped with millions of Android phones, an a random previous
>>> snaphot has been merged in drivers/staging/.
>>>
>>> Compared to the sdfat driver shipped on the phones the following changes
>>> have been made:
>>>
>>> - the support for vfat has been removed as that is already supported
>>> by fs/fat
>>> - driver has been renamed to exfat
>>> - the code has been refactored and clean up to fully integrate into
>>> the upstream Linux version and follow the Linux coding style
>>> - metadata operations like create, lookup and readdir have been further
>>> optimized
>>> - various major and minor bugs have been fixed
>>>
>>> We plan to treat this version as the future upstream for the code base
>>> once merged, and all new features and bug fixes will go upstream first.
>>
>> Apologies if I should know this already, but where are the userspace tools
>> for exfat located?
>
> The upstream for that is https://github.com/relan/exfat
>
> On Fedora, they're available in the rpmfusion RPM 'exfat-utils', not sure where
> Ubuntu or other distros put it.

Thanks, I wasn't sure if that was the "official" repo at this point.

-Eric

Attachments:

2019-11-14 00:42:59

by Namjae Jeon

Subject: RE: [PATCH 00/13] add the latest exfat driver

> On 11/13/19 3:55 PM, Valdis Klētnieks wrote:
> > On Wed, 13 Nov 2019 15:00:23 -0600, Eric Sandeen said:
> >> On 11/13/19 2:17 AM, Namjae Jeon wrote:
> >>> This adds the latest Samsung exfat driver to fs/exfat. This is an
> >>> implementation of the Microsoft exFAT specification. Previous versions
> >>> of this shipped with millions of Android phones, an a random previous
> >>> snaphot has been merged in drivers/staging/.
> >>>
> >>> Compared to the sdfat driver shipped on the phones the following changes
> >>> have been made:
> >>>
> >>> - the support for vfat has been removed as that is already supported
> >>> by fs/fat
> >>> - driver has been renamed to exfat
> >>> - the code has been refactored and clean up to fully integrate into
> >>> the upstream Linux version and follow the Linux coding style
> >>> - metadata operations like create, lookup and readdir have been further
> >>> optimized
> >>> - various major and minor bugs have been fixed
> >>>
> >>> We plan to treat this version as the future upstream for the code base
> >>> once merged, and all new features and bug fixes will go upstream first.
> >>
> >> Apologies if I should know this already, but where are the userspace
> tools
> >> for exfat located?
> >
> > The upstream for that is https://protect2.fireeye.com/url?k=c58c1a81-
> 98101be1-c58d91ce-0cc47a31307c-
> f7e416d4f44c26c5&u=https://github.com/relan/exfat
> >
> > On Fedora, they're available in the rpmfusion RPM 'exfat-utils', not sure
> where
> > Ubuntu or other distros put it.
>
> Thanks, I wasn't sure if that was the "official" repo at this point.
I am preparing exfat-tools project and will share it here.
>
> -Eric

2019-11-17 14:20:19

by Markus Elfring

Subject: Re: [PATCH 03/13] exfat: add inode operations

…
> +++ b/fs/exfat/inode.c
…
> +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
> + bool excl)
> +{
…
+out:
+ mutex_unlock(&EXFAT_SB(sb)->s_lock);

Can the label “unlock” be more appropriate?


> +static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
> + unsigned int flags)
> +{
…
> +error:
> + mutex_unlock(&EXFAT_SB(sb)->s_lock);

Would you like to use the label “unlock” also at this place (and similar ones)?


> +static int exfat_search_empty_slot(struct super_block *sb,
> + struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
> + int num_entries)
> +{
…
> +out:
> + kfree(clu);

How do you think about to rename the label to “free_clu”?

Regards,
Markus

2019-11-18 05:05:59

by Namjae Jeon

Subject: RE: [PATCH 03/13] exfat: add inode operations

> …
> > +++ b/fs/exfat/inode.c
> …
> > +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t
> mode,
> > + bool excl)
> > +{
> …
> +out:
> + mutex_unlock(&EXFAT_SB(sb)->s_lock);
>
> Can the label “unlock” be more appropriate?
Yep, Will change it.
>
>
> > +static struct dentry *exfat_lookup(struct inode *dir, struct dentry
> *dentry,
> > + unsigned int flags)
> > +{
> …
> > +error:
> > + mutex_unlock(&EXFAT_SB(sb)->s_lock);
>
> Would you like to use the label “unlock” also at this place (and similar
> ones)?
Yep, Will change all ones.

>
>
> > +static int exfat_search_empty_slot(struct super_block *sb,
> > + struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
> > + int num_entries)
> > +{
> …
> > +out:
> > + kfree(clu);
>
> How do you think about to rename the label to “free_clu”?
Yep, Will change it on V2.

Thanks for your review!
>
> Regards,
> Markus