diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Android.bp | 12 | ||||
| -rw-r--r-- | lib/Makefile.am | 4 | ||||
| -rw-r--r-- | lib/Makefile.in | 591 | ||||
| -rw-r--r-- | lib/exfat_dir.c | 955 | ||||
| -rw-r--r-- | lib/exfat_fs.c | 304 | ||||
| -rw-r--r-- | lib/libexfat.c | 1019 |
6 files changed, 2885 insertions, 0 deletions
diff --git a/lib/Android.bp b/lib/Android.bp new file mode 100644 index 0000000..f97aff5 --- /dev/null +++ b/lib/Android.bp @@ -0,0 +1,12 @@ +// Copyright 2020 The Android Open Source Project + +cc_library_static { + name: "libexfat", + + srcs: [ + "libexfat.c", + "exfat_fs.c", + "exfat_dir.c", + ], + defaults: ["exfatprogs-defaults"], +} diff --git a/lib/Makefile.am b/lib/Makefile.am new file mode 100644 index 0000000..d732cfd --- /dev/null +++ b/lib/Makefile.am @@ -0,0 +1,4 @@ +AM_CFLAGS = -Wall -include $(top_builddir)/config.h -I$(top_srcdir)/include -fno-common +noinst_LIBRARIES = libexfat.a + +libexfat_a_SOURCES = libexfat.c exfat_fs.c exfat_dir.c diff --git a/lib/Makefile.in b/lib/Makefile.in new file mode 100644 index 0000000..50c6658 --- /dev/null +++ b/lib/Makefile.in @@ -0,0 +1,591 @@ +# Makefile.in generated by automake 1.15.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2017 Free Software Foundation, Inc. + +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; 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+ +#define fsck_err(parent, inode, fmt, ...) \ +({ \ + exfat_resolve_path_parent(&path_resolve_ctx, \ + parent, inode); \ + exfat_err("ERROR: %s: " fmt, \ + path_resolve_ctx.local_path, \ + ##__VA_ARGS__); \ +}) + +static ssize_t write_block(struct exfat_de_iter *iter, unsigned int block) +{ + off_t device_offset; + struct exfat *exfat = iter->exfat; + struct buffer_desc *desc; + unsigned int i; + + desc = &iter->buffer_desc[block & 0x01]; + + for (i = 0; i < iter->read_size / iter->write_size; i++) { + if (desc->dirty[i]) { + device_offset = exfat_c2o(exfat, desc->p_clus) + + desc->offset; + if (exfat_write(exfat->blk_dev->dev_fd, + desc->buffer + i * iter->write_size, + iter->write_size, + device_offset + i * iter->write_size) + != (ssize_t)iter->write_size) + return -EIO; + desc->dirty[i] = 0; + } + } + return 0; +} + +static int read_ahead_first_blocks(struct exfat_de_iter *iter) +{ +#ifdef POSIX_FADV_WILLNEED + struct exfat *exfat = iter->exfat; + clus_t clus_count; + unsigned int size; + + clus_count = iter->parent->size / exfat->clus_size; + + if (clus_count > 1) { + iter->ra_begin_offset = 0; + iter->ra_next_clus = 1; + size = exfat->clus_size; + } else { + iter->ra_begin_offset = 0; + iter->ra_next_clus = 0; + size = iter->ra_partial_size; + } + return posix_fadvise(exfat->blk_dev->dev_fd, + exfat_c2o(exfat, iter->parent->first_clus), size, + POSIX_FADV_WILLNEED); +#else + return -ENOTSUP; +#endif +} + +/** + * read the next fragment in advance, and assume the fragment + * which covers @clus is already read. + */ +static int read_ahead_next_blocks(struct exfat_de_iter *iter, + clus_t clus, unsigned int offset, clus_t p_clus) +{ +#ifdef POSIX_FADV_WILLNEED + struct exfat *exfat = iter->exfat; + off_t device_offset; + clus_t clus_count, ra_clus, ra_p_clus; + unsigned int size; + int ret = 0; + + clus_count = iter->parent->size / exfat->clus_size; + if (clus + 1 < clus_count) { + ra_clus = clus + 1; + if (ra_clus == iter->ra_next_clus && + offset >= iter->ra_begin_offset) { + ret = exfat_get_inode_next_clus(exfat, iter->parent, + p_clus, &ra_p_clus); + if (ret) + return ret; + + if (ra_p_clus == EXFAT_EOF_CLUSTER) + return -EIO; + + device_offset = exfat_c2o(exfat, ra_p_clus); + size = ra_clus + 1 < clus_count ? + exfat->clus_size : iter->ra_partial_size; + ret = posix_fadvise(exfat->blk_dev->dev_fd, + device_offset, size, + POSIX_FADV_WILLNEED); + iter->ra_next_clus = ra_clus + 1; + iter->ra_begin_offset = 0; + } + } else { + if (offset >= iter->ra_begin_offset && + offset + iter->ra_partial_size <= + exfat->clus_size) { + device_offset = exfat_c2o(exfat, p_clus) + + offset + iter->ra_partial_size; + ret = posix_fadvise(exfat->blk_dev->dev_fd, + device_offset, iter->ra_partial_size, + POSIX_FADV_WILLNEED); + iter->ra_begin_offset = + offset + iter->ra_partial_size; + } + } + + return ret; +#else + return -ENOTSUP; +#endif +} + +static int read_ahead_next_dir_blocks(struct exfat_de_iter *iter) +{ +#ifdef POSIX_FADV_WILLNEED + struct exfat *exfat = iter->exfat; + struct list_head *current; + struct exfat_inode *next_inode; + off_t offset; + + if (list_empty(&exfat->dir_list)) + return -EINVAL; + + current = exfat->dir_list.next; + if (iter->parent == list_entry(current, struct exfat_inode, list) && + current->next != &exfat->dir_list) { + next_inode = list_entry(current->next, struct exfat_inode, + list); + offset = exfat_c2o(exfat, next_inode->first_clus); + return posix_fadvise(exfat->blk_dev->dev_fd, offset, + iter->ra_partial_size, + POSIX_FADV_WILLNEED); + } + + return 0; +#else + return -ENOTSUP; +#endif +} + +static ssize_t read_block(struct exfat_de_iter *iter, unsigned int block) +{ + struct exfat *exfat = iter->exfat; + struct buffer_desc *desc, *prev_desc; + off_t device_offset; + ssize_t ret; + + desc = &iter->buffer_desc[block & 0x01]; + if (block == 0) { + desc->p_clus = iter->parent->first_clus; + desc->offset = 0; + } + + /* if the buffer already contains dirty dentries, write it */ + if (write_block(iter, block)) + return -EIO; + + if (block > 0) { + if (block > iter->parent->size / iter->read_size) + return EOF; + + prev_desc = &iter->buffer_desc[(block-1) & 0x01]; + if (prev_desc->offset + 2 * iter->read_size <= + exfat->clus_size) { + desc->p_clus = prev_desc->p_clus; + desc->offset = prev_desc->offset + iter->read_size; + } else { + ret = exfat_get_inode_next_clus(exfat, iter->parent, + prev_desc->p_clus, &desc->p_clus); + desc->offset = 0; + if (ret) + return ret; + else if (desc->p_clus == EXFAT_EOF_CLUSTER) + return EOF; + } + } + + device_offset = exfat_c2o(exfat, desc->p_clus) + desc->offset; + ret = exfat_read(exfat->blk_dev->dev_fd, desc->buffer, + iter->read_size, device_offset); + if (ret <= 0) + return ret; + + /* + * if a buffer is filled with dentries, read blocks ahead of time, + * otherwise read blocks of the next directory in advance. + */ + if (desc->buffer[iter->read_size - 32] != EXFAT_LAST) + read_ahead_next_blocks(iter, + (block * iter->read_size) / exfat->clus_size, + (block * iter->read_size) % exfat->clus_size, + desc->p_clus); + else + read_ahead_next_dir_blocks(iter); + return ret; +} + +int exfat_de_iter_init(struct exfat_de_iter *iter, struct exfat *exfat, + struct exfat_inode *dir, struct buffer_desc *bd) +{ + iter->exfat = exfat; + iter->parent = dir; + iter->write_size = exfat->sect_size; + iter->read_size = exfat->clus_size <= 4*KB ? exfat->clus_size : 4*KB; + if (exfat->clus_size <= 32 * KB) + iter->ra_partial_size = MAX(4 * KB, exfat->clus_size / 2); + else + iter->ra_partial_size = exfat->clus_size / 4; + iter->ra_partial_size = MIN(iter->ra_partial_size, 8 * KB); + + iter->buffer_desc = bd; + + iter->de_file_offset = 0; + iter->next_read_offset = iter->read_size; + iter->max_skip_dentries = 0; + iter->invalid_name_num = 0; + + if (iter->parent->size == 0) + return EOF; + + read_ahead_first_blocks(iter); + if (read_block(iter, 0) != (ssize_t)iter->read_size) { + exfat_err("failed to read directory entries.\n"); + return -EIO; + } + + return 0; +} + +int exfat_de_iter_get(struct exfat_de_iter *iter, + int ith, struct exfat_dentry **dentry) +{ + off_t next_de_file_offset; + ssize_t ret; + unsigned int block; + + next_de_file_offset = iter->de_file_offset + + ith * sizeof(struct exfat_dentry); + block = (unsigned int)(next_de_file_offset / iter->read_size); + + if (next_de_file_offset + sizeof(struct exfat_dentry) > + iter->parent->size) + return EOF; + /* the dentry must be in current, or next block which will be read */ + if (block > iter->de_file_offset / iter->read_size + 1) + return -ERANGE; + + /* read next cluster if needed */ + if (next_de_file_offset >= iter->next_read_offset) { + ret = read_block(iter, block); + if (ret != (ssize_t)iter->read_size) + return ret; + iter->next_read_offset += iter->read_size; + } + + if (ith + 1 > iter->max_skip_dentries) + iter->max_skip_dentries = ith + 1; + + *dentry = (struct exfat_dentry *) + (iter->buffer_desc[block & 0x01].buffer + + next_de_file_offset % iter->read_size); + return 0; +} + +int exfat_de_iter_get_dirty(struct exfat_de_iter *iter, + int ith, struct exfat_dentry **dentry) +{ + off_t next_file_offset; + unsigned int block; + int ret, sect_idx; + + ret = exfat_de_iter_get(iter, ith, dentry); + if (!ret) { + next_file_offset = iter->de_file_offset + + ith * sizeof(struct exfat_dentry); + block = (unsigned int)(next_file_offset / iter->read_size); + sect_idx = (int)((next_file_offset % iter->read_size) / + iter->write_size); + iter->buffer_desc[block & 0x01].dirty[sect_idx] = 1; + } + + return ret; +} + +int exfat_de_iter_flush(struct exfat_de_iter *iter) +{ + if (write_block(iter, 0) || write_block(iter, 1)) + return -EIO; + return 0; +} + +int exfat_de_iter_advance(struct exfat_de_iter *iter, int skip_dentries) +{ + if (skip_dentries > iter->max_skip_dentries) + return -EINVAL; + + iter->max_skip_dentries = 0; + iter->de_file_offset = iter->de_file_offset + + skip_dentries * sizeof(struct exfat_dentry); + return 0; +} + +off_t exfat_de_iter_device_offset(struct exfat_de_iter *iter) +{ + struct buffer_desc *bd; + unsigned int block; + + if ((uint64_t)iter->de_file_offset >= iter->parent->size) + return EOF; + + block = iter->de_file_offset / iter->read_size; + bd = &iter->buffer_desc[block & 0x01]; + return exfat_c2o(iter->exfat, bd->p_clus) + bd->offset + + iter->de_file_offset % iter->read_size; +} + +off_t exfat_de_iter_file_offset(struct exfat_de_iter *iter) +{ + return iter->de_file_offset; +} + +/* + * try to find the dentry set matched with @filter. this function + * doesn't verify the dentry set. + * + * if found, return 0. if not found, return EOF. otherwise return errno. + */ +int exfat_lookup_dentry_set(struct exfat *exfat, struct exfat_inode *parent, + struct exfat_lookup_filter *filter) +{ + struct buffer_desc *bd = NULL; + struct exfat_dentry *dentry = NULL; + off_t free_file_offset = 0, free_dev_offset = 0; + struct exfat_de_iter de_iter; + int dentry_count, empty_dentry_count = 0; + int retval; + + bd = exfat_alloc_buffer(2, exfat->clus_size, exfat->sect_size); + if (!bd) + return -ENOMEM; + + retval = exfat_de_iter_init(&de_iter, exfat, parent, bd); + if (retval == EOF || retval) + goto out; + + filter->out.dentry_set = NULL; + while (1) { + retval = exfat_de_iter_get(&de_iter, 0, &dentry); + if (retval == EOF) { + break; + } else if (retval) { + fsck_err(parent->parent, parent, + "failed to get a dentry. %d\n", retval); + goto out; + } + + if (!IS_EXFAT_DELETED(dentry->type)) { + if (filter->in.dentry_count == 0 || + empty_dentry_count < filter->in.dentry_count) + empty_dentry_count = 0; + } + + dentry_count = 1; + if (dentry->type == filter->in.type) { + retval = 0; + if (filter->in.filter) + retval = filter->in.filter(&de_iter, + filter->in.param, + &dentry_count); + + if (retval == 0) { + struct exfat_dentry *d; + int i; + + filter->out.dentry_set = calloc(dentry_count, + sizeof(struct exfat_dentry)); + if (!filter->out.dentry_set) { + retval = -ENOMEM; + goto out; + } + for (i = 0; i < dentry_count; i++) { + exfat_de_iter_get(&de_iter, i, &d); + memcpy(filter->out.dentry_set + i, d, + sizeof(struct exfat_dentry)); + } + filter->out.dentry_count = dentry_count; + goto out; + } else if (retval < 0) { + goto out; + } + } else if (IS_EXFAT_DELETED(dentry->type)) { + if (empty_dentry_count == 0) { + free_file_offset = + exfat_de_iter_file_offset(&de_iter); + free_dev_offset = + exfat_de_iter_device_offset(&de_iter); + } + + if (filter->in.dentry_count == 0 || + empty_dentry_count < filter->in.dentry_count) + empty_dentry_count++; + } + + exfat_de_iter_advance(&de_iter, dentry_count); + } + +out: + if (retval == 0) { + filter->out.file_offset = + exfat_de_iter_file_offset(&de_iter); + filter->out.dev_offset = + exfat_de_iter_device_offset(&de_iter); + } else if (retval == EOF && empty_dentry_count) { + filter->out.file_offset = free_file_offset; + filter->out.dev_offset = free_dev_offset; + } else { + filter->out.file_offset = exfat_de_iter_file_offset(&de_iter); + filter->out.dev_offset = EOF; + } + if (bd) + exfat_free_buffer(bd, 2); + return retval; +} + +static int filter_lookup_file(struct exfat_de_iter *de_iter, + void *param, int *dentry_count) +{ + struct exfat_dentry *file_de, *stream_de, *name_de; + __le16 *name; + int retval, name_len; + int i; + + retval = exfat_de_iter_get(de_iter, 0, &file_de); + if (retval || file_de->type != EXFAT_FILE) + return 1; + + retval = exfat_de_iter_get(de_iter, 1, &stream_de); + if (retval || stream_de->type != EXFAT_STREAM) + return 1; + + name = (__le16 *)param; + name_len = (int)exfat_utf16_len(name, PATH_MAX); + + if (file_de->dentry.file.num_ext < + 1 + (name_len + ENTRY_NAME_MAX - 1) / ENTRY_NAME_MAX) + return 1; + + for (i = 2; i <= file_de->dentry.file.num_ext && name_len > 0; i++) { + int len; + + retval = exfat_de_iter_get(de_iter, i, &name_de); + if (retval || name_de->type != EXFAT_NAME) + return 1; + + len = MIN(name_len + 1, ENTRY_NAME_MAX); + if (memcmp(name_de->dentry.name.unicode_0_14, + name, len * 2) != 0) + return 1; + + name += len; + name_len -= len; + } + + *dentry_count = i; + return 0; +} + +int exfat_lookup_file_by_utf16name(struct exfat *exfat, + struct exfat_inode *parent, + __le16 *utf16_name, + struct exfat_lookup_filter *filter_out) +{ + int retval; + + filter_out->in.type = EXFAT_FILE; + filter_out->in.filter = filter_lookup_file; + filter_out->in.param = utf16_name; + filter_out->in.dentry_count = 0; + + retval = exfat_lookup_dentry_set(exfat, parent, filter_out); + if (retval < 0) + return retval; + + return 0; +} + +int exfat_lookup_file(struct exfat *exfat, struct exfat_inode *parent, + const char *name, struct exfat_lookup_filter *filter_out) +{ + int retval; + __le16 utf16_name[PATH_MAX + 2] = {0, }; + + retval = (int)exfat_utf16_enc(name, utf16_name, sizeof(utf16_name)); + if (retval < 0) + return retval; + + return exfat_lookup_file_by_utf16name(exfat, parent, utf16_name, + filter_out); +} + +void exfat_calc_dentry_checksum(struct exfat_dentry *dentry, + uint16_t *checksum, bool primary) +{ + unsigned int i; + uint8_t *bytes; + + bytes = (uint8_t *)dentry; + + /* use += to avoid promotion to int; UBSan complaints about signed overflow */ + *checksum = (*checksum << 15) | (*checksum >> 1); + *checksum += bytes[0]; + *checksum = (*checksum << 15) | (*checksum >> 1); + *checksum += bytes[1]; + + i = primary ? 4 : 2; + for (; i < sizeof(*dentry); i++) { + *checksum = (*checksum << 15) | (*checksum >> 1); + *checksum += bytes[i]; + } +} + +static uint16_t calc_dentry_set_checksum(struct exfat_dentry *dset, int dcount) +{ + uint16_t checksum; + int i; + + if (dcount < MIN_FILE_DENTRIES) + return 0; + + checksum = 0; + exfat_calc_dentry_checksum(&dset[0], &checksum, true); + for (i = 1; i < dcount; i++) + exfat_calc_dentry_checksum(&dset[i], &checksum, false); + return checksum; +} + +uint16_t exfat_calc_name_hash(struct exfat *exfat, + __le16 *name, int len) +{ + int i; + __le16 ch; + uint16_t chksum = 0; + + for (i = 0; i < len; i++) { + ch = exfat->upcase_table[le16_to_cpu(name[i])]; + ch = cpu_to_le16(ch); + + /* use += to avoid promotion to int; UBSan complaints about signed overflow */ + chksum = (chksum << 15) | (chksum >> 1); + chksum += ch & 0xFF; + chksum = (chksum << 15) | (chksum >> 1); + chksum += ch >> 8; + } + return chksum; +} + +static void unix_time_to_exfat_time(time_t unix_time, __u8 *tz, __le16 *date, + __le16 *time, __u8 *time_ms) +{ + struct tm tm; + __u16 t, d; + + gmtime_r(&unix_time, &tm); + d = ((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday; + t = (tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1); + + *tz = 0x80; + *date = cpu_to_le16(d); + *time = cpu_to_le16(t); + if (time_ms) + *time_ms = (tm.tm_sec & 1) * 100; +} + +int exfat_build_file_dentry_set(struct exfat *exfat, const char *name, + unsigned short attr, struct exfat_dentry **dentry_set, + int *dentry_count) +{ + struct exfat_dentry *dset; + __le16 utf16_name[PATH_MAX + 2]; + int retval; + int dcount, name_len, i; + __le16 e_date, e_time; + __u8 tz, e_time_ms; + + memset(utf16_name, 0, sizeof(utf16_name)); + retval = exfat_utf16_enc(name, utf16_name, sizeof(utf16_name)); + if (retval < 0) + return retval; + + name_len = retval / 2; + dcount = 2 + DIV_ROUND_UP(name_len, ENTRY_NAME_MAX); + dset = calloc(1, dcount * DENTRY_SIZE); + if (!dset) + return -ENOMEM; + + dset[0].type = EXFAT_FILE; + dset[0].dentry.file.num_ext = dcount - 1; + dset[0].dentry.file.attr = cpu_to_le16(attr); + + unix_time_to_exfat_time(time(NULL), &tz, + &e_date, &e_time, &e_time_ms); + + dset[0].dentry.file.create_date = e_date; + dset[0].dentry.file.create_time = e_time; + dset[0].dentry.file.create_time_ms = e_time_ms; + dset[0].dentry.file.create_tz = tz; + + dset[0].dentry.file.modify_date = e_date; + dset[0].dentry.file.modify_time = e_time; + dset[0].dentry.file.modify_time_ms = e_time_ms; + dset[0].dentry.file.modify_tz = tz; + + dset[0].dentry.file.access_date = e_date; + dset[0].dentry.file.access_time = e_time; + dset[0].dentry.file.access_tz = tz; + + dset[1].type = EXFAT_STREAM; + dset[1].dentry.stream.flags = 0x01; + dset[1].dentry.stream.name_len = (__u8)name_len; + dset[1].dentry.stream.name_hash = + cpu_to_le16(exfat_calc_name_hash(exfat, utf16_name, name_len)); + + for (i = 2; i < dcount; i++) { + dset[i].type = EXFAT_NAME; + memcpy(dset[i].dentry.name.unicode_0_14, + utf16_name + (i - 2) * ENTRY_NAME_MAX, + ENTRY_NAME_MAX * 2); + } + + dset[0].dentry.file.checksum = + cpu_to_le16(calc_dentry_set_checksum(dset, dcount)); + + *dentry_set = dset; + *dentry_count = dcount; + return 0; +} + +int exfat_update_file_dentry_set(struct exfat *exfat, + struct exfat_dentry *dset, int dcount, + const char *name, + clus_t start_clu, clus_t ccount) +{ + int i, name_len; + __le16 utf16_name[PATH_MAX + 2]; + + if (dset[0].type != EXFAT_FILE || dcount < MIN_FILE_DENTRIES) + return -EINVAL; + + if (name) { + name_len = (int)exfat_utf16_enc(name, + utf16_name, sizeof(utf16_name)); + if (name_len < 0) + return name_len; + + name_len /= 2; + if (dcount != 2 + DIV_ROUND_UP(name_len, ENTRY_NAME_MAX)) + return -EINVAL; + + dset[1].dentry.stream.name_len = (__u8)name_len; + dset[1].dentry.stream.name_hash = + exfat_calc_name_hash(exfat, utf16_name, name_len); + + for (i = 2; i < dcount; i++) { + dset[i].type = EXFAT_NAME; + memcpy(dset[i].dentry.name.unicode_0_14, + utf16_name + (i - 2) * ENTRY_NAME_MAX, + ENTRY_NAME_MAX * 2); + } + } + + dset[1].dentry.stream.valid_size = cpu_to_le64(ccount * exfat->clus_size); + dset[1].dentry.stream.size = cpu_to_le64(ccount * exfat->clus_size); + if (start_clu) + dset[1].dentry.stream.start_clu = cpu_to_le32(start_clu); + + dset[0].dentry.file.checksum = + cpu_to_le16(calc_dentry_set_checksum(dset, dcount)); + return 0; +} + +static int find_free_cluster(struct exfat *exfat, + clus_t start, clus_t *new_clu) +{ + clus_t end = le32_to_cpu(exfat->bs->bsx.clu_count) + + EXFAT_FIRST_CLUSTER; + + if (!exfat_heap_clus(exfat, start)) + return -EINVAL; + + while (start < end) { + if (exfat_bitmap_find_zero(exfat, exfat->alloc_bitmap, + start, new_clu)) + break; + if (!exfat_bitmap_get(exfat->disk_bitmap, *new_clu)) + return 0; + start = *new_clu + 1; + } + + end = start; + start = EXFAT_FIRST_CLUSTER; + while (start < end) { + if (exfat_bitmap_find_zero(exfat, exfat->alloc_bitmap, + start, new_clu)) + goto out_nospc; + if (!exfat_bitmap_get(exfat->disk_bitmap, *new_clu)) + return 0; + start = *new_clu + 1; + } + +out_nospc: + *new_clu = EXFAT_EOF_CLUSTER; + return -ENOSPC; +} + +static int exfat_map_cluster(struct exfat *exfat, struct exfat_inode *inode, + off_t file_off, clus_t *mapped_clu) +{ + clus_t clu, next, count, last_count; + + if (!exfat_heap_clus(exfat, inode->first_clus)) + return -EINVAL; + + clu = inode->first_clus; + next = EXFAT_EOF_CLUSTER; + count = 1; + if (file_off == EOF) + last_count = DIV_ROUND_UP(inode->size, exfat->clus_size); + else + last_count = file_off / exfat->clus_size + 1; + + while (true) { + if (count * exfat->clus_size > inode->size) + return -EINVAL; + + if (count == last_count) { + *mapped_clu = clu; + return 0; + } + + if (exfat_get_inode_next_clus(exfat, inode, clu, &next)) + return -EINVAL; + + if (!exfat_heap_clus(exfat, clu)) + return -EINVAL; + + clu = next; + count++; + } + return -EINVAL; +} + +static int exfat_write_dentry_set(struct exfat *exfat, + struct exfat_dentry *dset, int dcount, + off_t dev_off, off_t *next_dev_off) +{ + clus_t clus; + unsigned int clus_off, dent_len, first_half_len, sec_half_len; + off_t first_half_off, sec_half_off = 0; + + if (exfat_o2c(exfat, dev_off, &clus, &clus_off)) + return -ERANGE; + + dent_len = dcount * DENTRY_SIZE; + first_half_len = MIN(dent_len, exfat->clus_size - clus_off); + sec_half_len = dent_len - first_half_len; + + first_half_off = dev_off; + if (sec_half_len) { + clus_t next_clus; + + if (exfat_get_next_clus(exfat, clus, &next_clus)) + return -EIO; + if (!exfat_heap_clus(exfat, next_clus)) + return -EINVAL; + sec_half_off = exfat_c2o(exfat, next_clus); + } + + if (exfat_write(exfat->blk_dev->dev_fd, dset, first_half_len, + first_half_off) != (ssize_t)first_half_len) + return -EIO; + + if (sec_half_len) { + dset = (struct exfat_dentry *)((char *)dset + first_half_len); + if (exfat_write(exfat->blk_dev->dev_fd, dset, sec_half_len, + sec_half_off) != (ssize_t)sec_half_len) + return -EIO; + } + + if (next_dev_off) { + if (sec_half_len) + *next_dev_off = sec_half_off + sec_half_len; + else + *next_dev_off = first_half_off + first_half_len; + } + return 0; +} + +static int exfat_alloc_cluster(struct exfat *exfat, struct exfat_inode *inode, + clus_t *new_clu) +{ + clus_t last_clu; + int err; + bool need_dset = inode != exfat->root; + + if ((need_dset && !inode->dentry_set) || inode->is_contiguous) + return -EINVAL; + + err = find_free_cluster(exfat, exfat->start_clu, new_clu); + if (err) { + exfat->start_clu = EXFAT_FIRST_CLUSTER; + exfat_err("failed to find an free cluster\n"); + return -ENOSPC; + } + exfat->start_clu = *new_clu; + + if (exfat_set_fat(exfat, *new_clu, EXFAT_EOF_CLUSTER)) + return -EIO; + + /* zero out the new cluster */ + if (exfat_write(exfat->blk_dev->dev_fd, exfat->zero_cluster, + exfat->clus_size, exfat_c2o(exfat, *new_clu)) != + (ssize_t)exfat->clus_size) { + exfat_err("failed to fill new cluster with zeroes\n"); + return -EIO; + } + + if (inode->size) { + err = exfat_map_cluster(exfat, inode, EOF, &last_clu); + if (err) { + exfat_err("failed to get the last cluster\n"); + return err; + } + + if (exfat_set_fat(exfat, last_clu, *new_clu)) + return -EIO; + + if (need_dset) { + err = exfat_update_file_dentry_set(exfat, + inode->dentry_set, + inode->dentry_count, + NULL, 0, + DIV_ROUND_UP(inode->size, + exfat->clus_size) + 1); + if (err) + return -EINVAL; + } + } else { + if (need_dset) { + err = exfat_update_file_dentry_set(exfat, + inode->dentry_set, + inode->dentry_count, + NULL, *new_clu, 1); + if (err) + return -EINVAL; + } + } + + if (need_dset && exfat_write_dentry_set(exfat, inode->dentry_set, + inode->dentry_count, + inode->dev_offset, NULL)) + return -EIO; + + exfat_bitmap_set(exfat->alloc_bitmap, *new_clu); + if (inode->size == 0) + inode->first_clus = *new_clu; + inode->size += exfat->clus_size; + return 0; +} + +int exfat_add_dentry_set(struct exfat *exfat, struct exfat_dentry_loc *loc, + struct exfat_dentry *dset, int dcount, + bool need_next_loc) +{ + struct exfat_inode *parent = loc->parent; + off_t dev_off, next_dev_off; + + if (parent->is_contiguous || + (uint64_t)loc->file_offset > parent->size || + (unsigned int)dcount * DENTRY_SIZE > exfat->clus_size) + return -EINVAL; + + dev_off = loc->dev_offset; + if ((uint64_t)loc->file_offset + dcount * DENTRY_SIZE > parent->size) { + clus_t new_clus; + + if (exfat_alloc_cluster(exfat, parent, &new_clus)) + return -EIO; + if ((uint64_t)loc->file_offset == parent->size - exfat->clus_size) + dev_off = exfat_c2o(exfat, new_clus); + } + + if (exfat_write_dentry_set(exfat, dset, dcount, dev_off, &next_dev_off)) + return -EIO; + + if (need_next_loc) { + loc->file_offset += dcount * DENTRY_SIZE; + loc->dev_offset = next_dev_off; + } + return 0; +} + +int exfat_create_file(struct exfat *exfat, struct exfat_inode *parent, + const char *name, unsigned short attr) +{ + struct exfat_dentry *dset; + int err, dcount; + struct exfat_lookup_filter filter; + struct exfat_dentry_loc loc; + + err = exfat_lookup_file(exfat, parent, name, &filter); + if (err == 0) { + dset = filter.out.dentry_set; + dcount = filter.out.dentry_count; + if ((le16_to_cpu(dset->dentry.file.attr) & attr) != attr) + err = -EEXIST; + goto out; + } + + err = exfat_build_file_dentry_set(exfat, name, attr, + &dset, &dcount); + if (err) + return err; + + loc.parent = parent; + loc.file_offset = filter.out.file_offset; + loc.dev_offset = filter.out.dev_offset; + err = exfat_add_dentry_set(exfat, &loc, dset, dcount, false); +out: + free(dset); + return err; +} diff --git a/lib/exfat_fs.c b/lib/exfat_fs.c new file mode 100644 index 0000000..d563c61 --- /dev/null +++ b/lib/exfat_fs.c @@ -0,0 +1,304 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 LG Electronics. + * + * Author(s): Hyunchul Lee <hyc.lee@gmail.com> + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> + +#include "exfat_ondisk.h" +#include "libexfat.h" + +#include "exfat_fs.h" +#include "exfat_dir.h" + +struct exfat_inode *exfat_alloc_inode(__u16 attr) +{ + struct exfat_inode *node; + int size; + + size = offsetof(struct exfat_inode, name) + NAME_BUFFER_SIZE; + node = (struct exfat_inode *)calloc(1, size); + if (!node) { + exfat_err("failed to allocate exfat_node\n"); + return NULL; + } + + node->parent = NULL; + INIT_LIST_HEAD(&node->children); + INIT_LIST_HEAD(&node->sibling); + INIT_LIST_HEAD(&node->list); + + node->attr = attr; + return node; +} + +void exfat_free_inode(struct exfat_inode *node) +{ + if (node) { + if (node->dentry_set) + free(node->dentry_set); + free(node); + } +} + +void exfat_free_children(struct exfat_inode *dir, bool file_only) +{ + struct exfat_inode *node, *i; + + list_for_each_entry_safe(node, i, &dir->children, sibling) { + if (file_only) { + if (!(node->attr & ATTR_SUBDIR)) { + list_del(&node->sibling); + exfat_free_inode(node); + } + } else { + list_del(&node->sibling); + list_del(&node->list); + exfat_free_inode(node); + } + } +} + +void exfat_free_file_children(struct exfat_inode *dir) +{ + exfat_free_children(dir, true); +} + +/* delete @child and all ancestors that does not have + * children + */ +void exfat_free_ancestors(struct exfat_inode *child) +{ + struct exfat_inode *parent; + + while (child && list_empty(&child->children)) { + if (!child->parent || !(child->attr & ATTR_SUBDIR)) + return; + + parent = child->parent; + list_del(&child->sibling); + exfat_free_inode(child); + + child = parent; + } + return; +} + +void exfat_free_dir_list(struct exfat *exfat) +{ + struct exfat_inode *dir, *i; + + list_for_each_entry_safe(dir, i, &exfat->dir_list, list) { + if (!dir->parent) + continue; + exfat_free_file_children(dir); + list_del(&dir->list); + exfat_free_inode(dir); + } +} + +void exfat_free_exfat(struct exfat *exfat) +{ + if (exfat) { + if (exfat->bs) + free(exfat->bs); + if (exfat->alloc_bitmap) + free(exfat->alloc_bitmap); + if (exfat->disk_bitmap) + free(exfat->disk_bitmap); + if (exfat->ohead_bitmap) + free(exfat->ohead_bitmap); + if (exfat->upcase_table) + free(exfat->upcase_table); + if (exfat->root) + exfat_free_inode(exfat->root); + if (exfat->zero_cluster) + free(exfat->zero_cluster); + free(exfat); + } +} + +struct exfat *exfat_alloc_exfat(struct exfat_blk_dev *blk_dev, struct pbr *bs) +{ + struct exfat *exfat; + + exfat = (struct exfat *)calloc(1, sizeof(*exfat)); + if (!exfat) + return NULL; + + INIT_LIST_HEAD(&exfat->dir_list); + exfat->blk_dev = blk_dev; + exfat->bs = bs; + exfat->clus_count = le32_to_cpu(bs->bsx.clu_count); + exfat->clus_size = EXFAT_CLUSTER_SIZE(bs); + exfat->sect_size = EXFAT_SECTOR_SIZE(bs); + + /* TODO: bitmap could be very large. */ + exfat->alloc_bitmap = (char *)calloc(1, + EXFAT_BITMAP_SIZE(exfat->clus_count)); + if (!exfat->alloc_bitmap) { + exfat_err("failed to allocate bitmap\n"); + goto err; + } + + exfat->ohead_bitmap = + calloc(1, EXFAT_BITMAP_SIZE(exfat->clus_count)); + if (!exfat->ohead_bitmap) { + exfat_err("failed to allocate bitmap\n"); + goto err; + } + + exfat->disk_bitmap = + calloc(1, EXFAT_BITMAP_SIZE(exfat->clus_count)); + if (!exfat->disk_bitmap) { + exfat_err("failed to allocate bitmap\n"); + goto err; + } + + exfat->zero_cluster = calloc(1, exfat->clus_size); + if (!exfat->zero_cluster) { + exfat_err("failed to allocate a zero-filled cluster buffer\n"); + goto err; + } + + exfat->start_clu = EXFAT_FIRST_CLUSTER; + return exfat; +err: + exfat_free_exfat(exfat); + return NULL; +} + +struct buffer_desc *exfat_alloc_buffer(int count, + unsigned int clu_size, unsigned int sect_size) +{ + struct buffer_desc *bd; + int i; + + bd = (struct buffer_desc *)calloc(sizeof(*bd), count); + if (!bd) + return NULL; + + for (i = 0; i < count; i++) { + bd[i].buffer = (char *)malloc(clu_size); + if (!bd[i].buffer) + goto err; + bd[i].dirty = (char *)calloc(clu_size / sect_size, 1); + if (!bd[i].dirty) + goto err; + } + return bd; +err: + exfat_free_buffer(bd, count); + return NULL; +} + +void exfat_free_buffer(struct buffer_desc *bd, int count) +{ + int i; + + for (i = 0; i < count; i++) { + if (bd[i].buffer) + free(bd[i].buffer); + if (bd[i].dirty) + free(bd[i].dirty); + } + free(bd); +} + +/* + * get references of ancestors that include @child until the count of + * ancesters is not larger than @count and the count of characters of + * their names is not larger than @max_char_len. + * return true if root is reached. + */ +static bool get_ancestors(struct exfat_inode *child, + struct exfat_inode **ancestors, int count, + int max_char_len, + int *ancestor_count) +{ + struct exfat_inode *dir; + int name_len, char_len; + int root_depth, depth, i; + + root_depth = 0; + char_len = 0; + max_char_len += 1; + + dir = child; + while (dir) { + name_len = exfat_utf16_len(dir->name, NAME_BUFFER_SIZE); + if (char_len + name_len > max_char_len) + break; + + /* include '/' */ + char_len += name_len + 1; + root_depth++; + + dir = dir->parent; + } + + depth = MIN(root_depth, count); + + for (dir = child, i = depth - 1; i >= 0; dir = dir->parent, i--) + ancestors[i] = dir; + + *ancestor_count = depth; + return !dir; +} + +int exfat_resolve_path(struct path_resolve_ctx *ctx, struct exfat_inode *child) +{ + int depth, i; + int name_len; + __le16 *utf16_path; + static const __le16 utf16_slash = cpu_to_le16(0x002F); + static const __le16 utf16_null = cpu_to_le16(0x0000); + size_t in_size; + + ctx->local_path[0] = '\0'; + + get_ancestors(child, + ctx->ancestors, + sizeof(ctx->ancestors) / sizeof(ctx->ancestors[0]), + PATH_MAX, + &depth); + + utf16_path = ctx->utf16_path; + for (i = 0; i < depth; i++) { + name_len = exfat_utf16_len(ctx->ancestors[i]->name, + NAME_BUFFER_SIZE); + memcpy((char *)utf16_path, (char *)ctx->ancestors[i]->name, + name_len * 2); + utf16_path += name_len; + memcpy((char *)utf16_path, &utf16_slash, sizeof(utf16_slash)); + utf16_path++; + } + + if (depth > 1) + utf16_path--; + memcpy((char *)utf16_path, &utf16_null, sizeof(utf16_null)); + utf16_path++; + + in_size = (utf16_path - ctx->utf16_path) * sizeof(__le16); + return exfat_utf16_dec(ctx->utf16_path, in_size, + ctx->local_path, sizeof(ctx->local_path)); +} + +int exfat_resolve_path_parent(struct path_resolve_ctx *ctx, + struct exfat_inode *parent, struct exfat_inode *child) +{ + int ret; + struct exfat_inode *old; + + old = child->parent; + child->parent = parent; + + ret = exfat_resolve_path(ctx, child); + child->parent = old; + return ret; +} diff --git a/lib/libexfat.c b/lib/libexfat.c new file mode 100644 index 0000000..d7b8344 --- /dev/null +++ b/lib/libexfat.c @@ -0,0 +1,1019 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org> + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/sysmacros.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <wchar.h> +#include <limits.h> +#include <assert.h> + +#include "exfat_ondisk.h" +#include "libexfat.h" +#include "version.h" +#include "exfat_fs.h" +#include "exfat_dir.h" + +unsigned int print_level = EXFAT_INFO; + +void exfat_bitmap_set_range(struct exfat *exfat, char *bitmap, + clus_t start_clus, clus_t count) +{ + clus_t clus; + + if (!exfat_heap_clus(exfat, start_clus) || + !exfat_heap_clus(exfat, start_clus + count - 1)) + return; + + clus = start_clus; + while (clus < start_clus + count) { + exfat_bitmap_set(bitmap, clus); + clus++; + } +} + +static int exfat_bitmap_find_bit(struct exfat *exfat, char *bmap, + clus_t start_clu, clus_t *next, + int bit) +{ + clus_t last_clu; + + last_clu = le32_to_cpu(exfat->bs->bsx.clu_count) + + EXFAT_FIRST_CLUSTER; + while (start_clu < last_clu) { + if (!!exfat_bitmap_get(bmap, start_clu) == bit) { + *next = start_clu; + return 0; + } + start_clu++; + } + return 1; +} + +int exfat_bitmap_find_zero(struct exfat *exfat, char *bmap, + clus_t start_clu, clus_t *next) +{ + return exfat_bitmap_find_bit(exfat, bmap, + start_clu, next, 0); +} + +int exfat_bitmap_find_one(struct exfat *exfat, char *bmap, + clus_t start_clu, clus_t *next) +{ + return exfat_bitmap_find_bit(exfat, bmap, + start_clu, next, 1); +} + +wchar_t exfat_bad_char(wchar_t w) +{ + return (w < 0x0020) + || (w == '*') || (w == '?') || (w == '<') || (w == '>') + || (w == '|') || (w == '"') || (w == ':') || (w == '/') + || (w == '\\'); +} + +void boot_calc_checksum(unsigned char *sector, unsigned short size, + bool is_boot_sec, __le32 *checksum) +{ + unsigned int index; + + if (is_boot_sec) { + for (index = 0; index < size; index++) { + if ((index == 106) || (index == 107) || (index == 112)) + continue; + *checksum = ((*checksum & 1) ? 0x80000000 : 0) + + (*checksum >> 1) + sector[index]; + } + } else { + for (index = 0; index < size; index++) { + *checksum = ((*checksum & 1) ? 0x80000000 : 0) + + (*checksum >> 1) + sector[index]; + } + } +} + +void show_version(void) +{ + printf("exfatprogs version : %s\n", EXFAT_PROGS_VERSION); +} + +static inline unsigned int sector_size_bits(unsigned int size) +{ + unsigned int bits = 8; + + do { + bits++; + size >>= 1; + } while (size > 256); + + return bits; +} + +static void exfat_set_default_cluster_size(struct exfat_blk_dev *bd, + struct exfat_user_input *ui) +{ + if (256 * MB >= bd->size) + ui->cluster_size = 4 * KB; + else if (32 * GB >= bd->size) + ui->cluster_size = 32 * KB; + else + ui->cluster_size = 128 * KB; +} + +void init_user_input(struct exfat_user_input *ui) +{ + memset(ui, 0, sizeof(struct exfat_user_input)); + ui->writeable = true; + ui->quick = true; +} + +int exfat_get_blk_dev_info(struct exfat_user_input *ui, + struct exfat_blk_dev *bd) +{ + int fd, ret = -1; + off_t blk_dev_size; + struct stat st; + unsigned long long blk_dev_offset = 0; + + fd = open(ui->dev_name, ui->writeable ? O_RDWR|O_EXCL : O_RDONLY); + if (fd < 0) { + exfat_err("open failed : %s, %s\n", ui->dev_name, + strerror(errno)); + return -1; + } + blk_dev_size = lseek(fd, 0, SEEK_END); + if (blk_dev_size <= 0) { + exfat_err("invalid block device size(%s)\n", + ui->dev_name); + ret = blk_dev_size; + close(fd); + goto out; + } + + if (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode)) { + char pathname[sizeof("/sys/dev/block/4294967295:4294967295/start")]; + FILE *fp; + + snprintf(pathname, sizeof(pathname), "/sys/dev/block/%u:%u/start", + major(st.st_rdev), minor(st.st_rdev)); + fp = fopen(pathname, "r"); + if (fp != NULL) { + if (fscanf(fp, "%llu", &blk_dev_offset) == 1) { + /* + * Linux kernel always reports partition offset + * in 512-byte units, regardless of sector size + */ + blk_dev_offset <<= 9; + } + fclose(fp); + } + } + + bd->dev_fd = fd; + bd->offset = blk_dev_offset; + bd->size = blk_dev_size; + if (!ui->cluster_size) + exfat_set_default_cluster_size(bd, ui); + + if (!ui->boundary_align) + ui->boundary_align = DEFAULT_BOUNDARY_ALIGNMENT; + + if (ioctl(fd, BLKSSZGET, &bd->sector_size) < 0) + bd->sector_size = DEFAULT_SECTOR_SIZE; + bd->sector_size_bits = sector_size_bits(bd->sector_size); + bd->num_sectors = blk_dev_size / bd->sector_size; + bd->num_clusters = blk_dev_size / ui->cluster_size; + + exfat_debug("Block device name : %s\n", ui->dev_name); + exfat_debug("Block device offset : %llu\n", bd->offset); + exfat_debug("Block device size : %llu\n", bd->size); + exfat_debug("Block sector size : %u\n", bd->sector_size); + exfat_debug("Number of the sectors : %llu\n", + bd->num_sectors); + exfat_debug("Number of the clusters : %u\n", + bd->num_clusters); + + ret = 0; + bd->dev_fd = fd; +out: + return ret; +} + +ssize_t exfat_read(int fd, void *buf, size_t size, off_t offset) +{ + return pread(fd, buf, size, offset); +} + +ssize_t exfat_write(int fd, void *buf, size_t size, off_t offset) +{ + return pwrite(fd, buf, size, offset); +} + +size_t exfat_utf16_len(const __le16 *str, size_t max_size) +{ + size_t i = 0; + + while (le16_to_cpu(str[i]) && i < max_size) + i++; + return i; +} + +ssize_t exfat_utf16_enc(const char *in_str, __u16 *out_str, size_t out_size) +{ + size_t mbs_len, out_len, i; + wchar_t *wcs; + + mbs_len = mbstowcs(NULL, in_str, 0); + if (mbs_len == (size_t)-1) { + if (errno == EINVAL || errno == EILSEQ) + exfat_err("invalid character sequence in current locale\n"); + return -errno; + } + + wcs = calloc(mbs_len+1, sizeof(wchar_t)); + if (!wcs) + return -ENOMEM; + + /* First convert multibyte char* string to wchar_t* string */ + if (mbstowcs(wcs, in_str, mbs_len+1) == (size_t)-1) { + if (errno == EINVAL || errno == EILSEQ) + exfat_err("invalid character sequence in current locale\n"); + free(wcs); + return -errno; + } + + /* Convert wchar_t* string (sequence of code points) to UTF-16 string */ + for (i = 0, out_len = 0; i < mbs_len; i++) { + if (2*(out_len+1) > out_size || + (wcs[i] >= 0x10000 && 2*(out_len+2) > out_size)) { + exfat_err("input string is too long\n"); + free(wcs); + return -E2BIG; + } + + /* Encode code point above Plane0 as UTF-16 surrogate pair */ + if (wcs[i] >= 0x10000) { + out_str[out_len++] = + cpu_to_le16(((wcs[i] - 0x10000) >> 10) + 0xD800); + wcs[i] = ((wcs[i] - 0x10000) & 0x3FF) + 0xDC00; + } + + out_str[out_len++] = cpu_to_le16(wcs[i]); + } + + free(wcs); + return 2*out_len; +} + +ssize_t exfat_utf16_dec(const __u16 *in_str, size_t in_len, + char *out_str, size_t out_size) +{ + size_t wcs_len, out_len, c_len, i; + char c_str[MB_LEN_MAX]; + wchar_t *wcs; + mbstate_t ps; + wchar_t w; + + wcs = calloc(in_len/2+1, sizeof(wchar_t)); + if (!wcs) + return -ENOMEM; + + /* First convert UTF-16 string to wchar_t* string */ + for (i = 0, wcs_len = 0; i < in_len/2; i++, wcs_len++) { + wcs[wcs_len] = le16_to_cpu(in_str[i]); + /* + * If wchar_t can store code point above Plane0 + * then unpack UTF-16 surrogate pair to code point + */ +#if WCHAR_MAX >= 0x10FFFF + if (wcs[wcs_len] >= 0xD800 && wcs[wcs_len] <= 0xDBFF && + i+1 < in_len/2) { + w = le16_to_cpu(in_str[i+1]); + if (w >= 0xDC00 && w <= 0xDFFF) { + wcs[wcs_len] = 0x10000 + + ((wcs[wcs_len] - 0xD800) << 10) + + (w - 0xDC00); + i++; + } + } +#endif + } + + memset(&ps, 0, sizeof(ps)); + + /* And then convert wchar_t* string to multibyte char* string */ + for (i = 0, out_len = 0, c_len = 0; i <= wcs_len; i++) { + c_len = wcrtomb(c_str, wcs[i], &ps); + /* + * If character is non-representable in current locale then + * try to store it as Unicode replacement code point U+FFFD + */ + if (c_len == (size_t)-1 && errno == EILSEQ) + c_len = wcrtomb(c_str, 0xFFFD, &ps); + /* If U+FFFD is also non-representable, try question mark */ + if (c_len == (size_t)-1 && errno == EILSEQ) + c_len = wcrtomb(c_str, L'?', &ps); + /* If also (7bit) question mark fails then we cannot do more */ + if (c_len == (size_t)-1) { + exfat_err("invalid UTF-16 sequence\n"); + free(wcs); + return -errno; + } + if (out_len+c_len > out_size) { + exfat_err("input string is too long\n"); + free(wcs); + return -E2BIG; + } + memcpy(out_str+out_len, c_str, c_len); + out_len += c_len; + } + + free(wcs); + + /* Last iteration of above loop should have produced null byte */ + if (c_len == 0 || out_str[out_len-1] != 0) { + exfat_err("invalid UTF-16 sequence\n"); + return -errno; + } + + return out_len-1; +} + +off_t exfat_get_root_entry_offset(struct exfat_blk_dev *bd) +{ + struct pbr *bs; + int nbytes; + unsigned int cluster_size, sector_size; + off_t root_clu_off; + + bs = (struct pbr *)malloc(EXFAT_MAX_SECTOR_SIZE); + if (!bs) { + exfat_err("failed to allocate memory\n"); + return -ENOMEM; + } + + nbytes = exfat_read(bd->dev_fd, bs, EXFAT_MAX_SECTOR_SIZE, 0); + if (nbytes != EXFAT_MAX_SECTOR_SIZE) { + exfat_err("boot sector read failed: %d\n", errno); + free(bs); + return -1; + } + + if (memcmp(bs->bpb.oem_name, "EXFAT ", 8) != 0) { + exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n"); + free(bs); + return -1; + } + + sector_size = 1 << bs->bsx.sect_size_bits; + cluster_size = (1 << bs->bsx.sect_per_clus_bits) * sector_size; + root_clu_off = le32_to_cpu(bs->bsx.clu_offset) * sector_size + + (le32_to_cpu(bs->bsx.root_cluster) - EXFAT_RESERVED_CLUSTERS) * + cluster_size; + free(bs); + + return root_clu_off; +} + +char *exfat_conv_volume_label(struct exfat_dentry *vol_entry) +{ + char *volume_label; + __le16 disk_label[VOLUME_LABEL_MAX_LEN]; + + volume_label = malloc(VOLUME_LABEL_BUFFER_SIZE); + if (!volume_label) + return NULL; + + memcpy(disk_label, vol_entry->vol_label, sizeof(disk_label)); + memset(volume_label, 0, VOLUME_LABEL_BUFFER_SIZE); + if (exfat_utf16_dec(disk_label, vol_entry->vol_char_cnt*2, + volume_label, VOLUME_LABEL_BUFFER_SIZE) < 0) { + exfat_err("failed to decode volume label\n"); + free(volume_label); + return NULL; + } + + return volume_label; +} + +int exfat_read_volume_label(struct exfat *exfat) +{ + struct exfat_dentry *dentry; + int err; + __le16 disk_label[VOLUME_LABEL_MAX_LEN]; + struct exfat_lookup_filter filter = { + .in.type = EXFAT_VOLUME, + .in.dentry_count = 0, + .in.filter = NULL, + }; + + err = exfat_lookup_dentry_set(exfat, exfat->root, &filter); + if (err) + return err; + + dentry = filter.out.dentry_set; + + if (dentry->vol_char_cnt == 0) + goto out; + + if (dentry->vol_char_cnt > VOLUME_LABEL_MAX_LEN) { + exfat_err("too long label. %d\n", dentry->vol_char_cnt); + err = -EINVAL; + goto out; + } + + memcpy(disk_label, dentry->vol_label, sizeof(disk_label)); + if (exfat_utf16_dec(disk_label, dentry->vol_char_cnt*2, + exfat->volume_label, sizeof(exfat->volume_label)) < 0) { + exfat_err("failed to decode volume label\n"); + err = -EINVAL; + goto out; + } + + exfat_info("label: %s\n", exfat->volume_label); +out: + free(filter.out.dentry_set); + return err; +} + +int exfat_set_volume_label(struct exfat *exfat, char *label_input) +{ + struct exfat_dentry *pvol; + struct exfat_dentry_loc loc; + __u16 volume_label[VOLUME_LABEL_MAX_LEN]; + int volume_label_len, dcount, err; + + struct exfat_lookup_filter filter = { + .in.type = EXFAT_VOLUME, + .in.dentry_count = 1, + .in.filter = NULL, + }; + + err = exfat_lookup_dentry_set(exfat, exfat->root, &filter); + if (!err) { + pvol = filter.out.dentry_set; + dcount = filter.out.dentry_count; + memset(pvol->vol_label, 0, sizeof(pvol->vol_label)); + } else { + pvol = calloc(sizeof(struct exfat_dentry), 1); + if (!pvol) + return -ENOMEM; + + dcount = 1; + pvol->type = EXFAT_VOLUME; + } + + volume_label_len = exfat_utf16_enc(label_input, + volume_label, sizeof(volume_label)); + if (volume_label_len < 0) { + exfat_err("failed to encode volume label\n"); + free(pvol); + return -1; + } + + memcpy(pvol->vol_label, volume_label, volume_label_len); + pvol->vol_char_cnt = volume_label_len/2; + + loc.parent = exfat->root; + loc.file_offset = filter.out.file_offset; + loc.dev_offset = filter.out.dev_offset; + err = exfat_add_dentry_set(exfat, &loc, pvol, dcount, false); + exfat_info("new label: %s\n", label_input); + + free(pvol); + + return err; +} + +static inline void print_guid(const char *msg, const __u8 *guid) +{ + exfat_info("%s: %02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n", + msg, + guid[0], guid[1], guid[2], guid[3], + guid[4], guid[5], guid[5], guid[7], + guid[8], guid[9], guid[10], guid[11], + guid[12], guid[13], guid[14], guid[15]); +} + +static int set_guid(__u8 *guid, const char *input) +{ + int i, j, zero_len = 0; + int len = strlen(input); + + if (len != VOLUME_GUID_LEN * 2 && len != VOLUME_GUID_LEN * 2 + 4) { + exfat_err("invalid format for volume guid\n"); + return -EINVAL; + } + + for (i = 0, j = 0; i < len; i++) { + unsigned char ch = input[i]; + + if (ch >= '0' && ch <= '9') + ch -= '0'; + else if (ch >= 'a' && ch <= 'f') + ch -= 'a' - 0xA; + else if (ch >= 'A' && ch <= 'F') + ch -= 'A' - 0xA; + else if (ch == '-' && len == VOLUME_GUID_LEN * 2 + 4 && + (i == 8 || i == 13 || i == 18 || i == 23)) + continue; + else { + exfat_err("invalid character '%c' for volume GUID\n", ch); + return -EINVAL; + } + + if (j & 1) + guid[j >> 1] |= ch; + else + guid[j >> 1] = ch << 4; + + j++; + + if (ch == 0) + zero_len++; + } + + if (zero_len == VOLUME_GUID_LEN * 2) { + exfat_err("%s is invalid for volume GUID\n", input); + return -EINVAL; + } + + return 0; +} + +int exfat_read_volume_guid(struct exfat *exfat) +{ + int err; + uint16_t checksum = 0; + struct exfat_dentry *dentry; + struct exfat_lookup_filter filter = { + .in.type = EXFAT_GUID, + .in.dentry_count = 1, + .in.filter = NULL, + }; + + err = exfat_lookup_dentry_set(exfat, exfat->root, &filter); + if (err) + return err; + + dentry = filter.out.dentry_set; + exfat_calc_dentry_checksum(dentry, &checksum, true); + + if (cpu_to_le16(checksum) == dentry->dentry.guid.checksum) + print_guid("GUID", dentry->dentry.guid.guid); + else + exfat_info("GUID is corrupted, please delete it or set a new one\n"); + + free(dentry); + + return err; +} + +int __exfat_set_volume_guid(struct exfat_dentry *dentry, const char *guid) +{ + int err; + uint16_t checksum = 0; + + memset(dentry, 0, sizeof(*dentry)); + dentry->type = EXFAT_GUID; + + err = set_guid(dentry->dentry.guid.guid, guid); + if (err) + return err; + + exfat_calc_dentry_checksum(dentry, &checksum, true); + dentry->dentry.guid.checksum = cpu_to_le16(checksum); + + return 0; +} + +/* + * Create/Update/Delete GUID dentry in root directory + * + * create/update GUID if @guid is not NULL. + * delete GUID if @guid is NULL. + */ +int exfat_set_volume_guid(struct exfat *exfat, const char *guid) +{ + struct exfat_dentry *dentry; + struct exfat_dentry_loc loc; + int err; + + struct exfat_lookup_filter filter = { + .in.type = EXFAT_GUID, + .in.dentry_count = 1, + .in.filter = NULL, + }; + + err = exfat_lookup_dentry_set(exfat, exfat->root, &filter); + if (!err) { + /* GUID entry is found */ + dentry = filter.out.dentry_set; + } else { + /* no GUID to delete */ + if (guid == NULL) + return 0; + + dentry = calloc(1, sizeof(*dentry)); + if (!dentry) + return -ENOMEM; + } + + if (guid) { + /* Set GUID */ + err = __exfat_set_volume_guid(dentry, guid); + if (err) + goto out; + } else { + /* Delete GUID */ + dentry->type &= ~EXFAT_INVAL; + } + + loc.parent = exfat->root; + loc.file_offset = filter.out.file_offset; + loc.dev_offset = filter.out.dev_offset; + err = exfat_add_dentry_set(exfat, &loc, dentry, 1, false); + if (!err) { + if (guid) + print_guid("new GUID", dentry->dentry.guid.guid); + else + exfat_info("GUID is deleted\n"); + } + +out: + free(dentry); + + return err; +} + +int exfat_read_sector(struct exfat_blk_dev *bd, void *buf, unsigned int sec_off) +{ + int ret; + unsigned long long offset = + (unsigned long long)sec_off * bd->sector_size; + + ret = pread(bd->dev_fd, buf, bd->sector_size, offset); + if (ret < 0) { + exfat_err("read failed, sec_off : %u\n", sec_off); + return -1; + } + return 0; +} + +int exfat_write_sector(struct exfat_blk_dev *bd, void *buf, + unsigned int sec_off) +{ + int bytes; + unsigned long long offset = + (unsigned long long)sec_off * bd->sector_size; + + bytes = pwrite(bd->dev_fd, buf, bd->sector_size, offset); + if (bytes != (int)bd->sector_size) { + exfat_err("write failed, sec_off : %u, bytes : %d\n", sec_off, + bytes); + return -1; + } + return 0; +} + +int exfat_write_checksum_sector(struct exfat_blk_dev *bd, + unsigned int checksum, bool is_backup) +{ + __le32 *checksum_buf; + int ret = 0; + unsigned int i; + unsigned int sec_idx = CHECKSUM_SEC_IDX; + + checksum_buf = malloc(bd->sector_size); + if (!checksum_buf) + return -1; + + if (is_backup) + sec_idx += BACKUP_BOOT_SEC_IDX; + + for (i = 0; i < bd->sector_size / sizeof(int); i++) + checksum_buf[i] = cpu_to_le32(checksum); + + ret = exfat_write_sector(bd, checksum_buf, sec_idx); + if (ret) { + exfat_err("checksum sector write failed\n"); + goto free; + } + +free: + free(checksum_buf); + return ret; +} + +int exfat_show_volume_serial(int fd) +{ + struct pbr *ppbr; + int ret; + + ppbr = malloc(EXFAT_MAX_SECTOR_SIZE); + if (!ppbr) { + exfat_err("Cannot allocate pbr: out of memory\n"); + return -1; + } + + /* read main boot sector */ + ret = exfat_read(fd, (char *)ppbr, EXFAT_MAX_SECTOR_SIZE, 0); + if (ret < 0) { + exfat_err("main boot sector read failed\n"); + ret = -1; + goto free_ppbr; + } + + if (memcmp(ppbr->bpb.oem_name, "EXFAT ", 8) != 0) { + exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n"); + ret = -1; + goto free_ppbr; + } + + exfat_info("volume serial : 0x%x\n", ppbr->bsx.vol_serial); + +free_ppbr: + free(ppbr); + return ret; +} + +static int exfat_update_boot_checksum(struct exfat_blk_dev *bd, bool is_backup) +{ + unsigned int checksum = 0; + int ret, sec_idx, backup_sec_idx = 0; + unsigned char *buf; + + buf = malloc(bd->sector_size); + if (!buf) { + exfat_err("Cannot allocate pbr: out of memory\n"); + return -1; + } + + if (is_backup) + backup_sec_idx = BACKUP_BOOT_SEC_IDX; + + for (sec_idx = BOOT_SEC_IDX; sec_idx < CHECKSUM_SEC_IDX; sec_idx++) { + bool is_boot_sec = false; + + ret = exfat_read_sector(bd, buf, sec_idx + backup_sec_idx); + if (ret < 0) { + exfat_err("sector(%d) read failed\n", sec_idx); + ret = -1; + goto free_buf; + } + + if (sec_idx == BOOT_SEC_IDX) + is_boot_sec = true; + + boot_calc_checksum(buf, bd->sector_size, is_boot_sec, + &checksum); + } + + ret = exfat_write_checksum_sector(bd, checksum, is_backup); + +free_buf: + free(buf); + + return ret; +} + +int exfat_set_volume_serial(struct exfat_blk_dev *bd, + struct exfat_user_input *ui) +{ + int ret; + struct pbr *ppbr; + + ppbr = malloc(EXFAT_MAX_SECTOR_SIZE); + if (!ppbr) { + exfat_err("Cannot allocate pbr: out of memory\n"); + return -1; + } + + /* read main boot sector */ + ret = exfat_read(bd->dev_fd, (char *)ppbr, EXFAT_MAX_SECTOR_SIZE, + BOOT_SEC_IDX); + if (ret < 0) { + exfat_err("main boot sector read failed\n"); + ret = -1; + goto free_ppbr; + } + + if (memcmp(ppbr->bpb.oem_name, "EXFAT ", 8) != 0) { + exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n"); + ret = -1; + goto free_ppbr; + } + + bd->sector_size = 1 << ppbr->bsx.sect_size_bits; + ppbr->bsx.vol_serial = ui->volume_serial; + + /* update main boot sector */ + ret = exfat_write_sector(bd, (char *)ppbr, BOOT_SEC_IDX); + if (ret < 0) { + exfat_err("main boot sector write failed\n"); + ret = -1; + goto free_ppbr; + } + + /* update backup boot sector */ + ret = exfat_write_sector(bd, (char *)ppbr, BACKUP_BOOT_SEC_IDX); + if (ret < 0) { + exfat_err("backup boot sector write failed\n"); + ret = -1; + goto free_ppbr; + } + + ret = exfat_update_boot_checksum(bd, 0); + if (ret < 0) { + exfat_err("main checksum update failed\n"); + goto free_ppbr; + } + + ret = exfat_update_boot_checksum(bd, 1); + if (ret < 0) + exfat_err("backup checksum update failed\n"); +free_ppbr: + free(ppbr); + + exfat_info("New volume serial : 0x%x\n", ui->volume_serial); + + return ret; +} + +unsigned int exfat_clus_to_blk_dev_off(struct exfat_blk_dev *bd, + unsigned int clu_off_sectnr, unsigned int clu) +{ + return clu_off_sectnr * bd->sector_size + + (clu - EXFAT_RESERVED_CLUSTERS) * bd->cluster_size; +} + +int exfat_get_next_clus(struct exfat *exfat, clus_t clus, clus_t *next) +{ + off_t offset; + + *next = EXFAT_EOF_CLUSTER; + + if (!exfat_heap_clus(exfat, clus)) + return -EINVAL; + + offset = (off_t)le32_to_cpu(exfat->bs->bsx.fat_offset) << + exfat->bs->bsx.sect_size_bits; + offset += sizeof(clus_t) * clus; + + if (exfat_read(exfat->blk_dev->dev_fd, next, sizeof(*next), offset) + != sizeof(*next)) + return -EIO; + *next = le32_to_cpu(*next); + return 0; +} + +int exfat_get_inode_next_clus(struct exfat *exfat, struct exfat_inode *node, + clus_t clus, clus_t *next) +{ + *next = EXFAT_EOF_CLUSTER; + + if (node->is_contiguous) { + if (!exfat_heap_clus(exfat, clus)) + return -EINVAL; + *next = clus + 1; + return 0; + } + + return exfat_get_next_clus(exfat, clus, next); +} + +int exfat_set_fat(struct exfat *exfat, clus_t clus, clus_t next_clus) +{ + off_t offset; + + offset = le32_to_cpu(exfat->bs->bsx.fat_offset) << + exfat->bs->bsx.sect_size_bits; + offset += sizeof(clus_t) * clus; + + if (exfat_write(exfat->blk_dev->dev_fd, &next_clus, sizeof(next_clus), + offset) != sizeof(next_clus)) + return -EIO; + return 0; +} + +off_t exfat_s2o(struct exfat *exfat, off_t sect) +{ + return sect << exfat->bs->bsx.sect_size_bits; +} + +off_t exfat_c2o(struct exfat *exfat, unsigned int clus) +{ + assert(clus >= EXFAT_FIRST_CLUSTER); + + return exfat_s2o(exfat, le32_to_cpu(exfat->bs->bsx.clu_offset) + + ((off_t)(clus - EXFAT_FIRST_CLUSTER) << + exfat->bs->bsx.sect_per_clus_bits)); +} + +int exfat_o2c(struct exfat *exfat, off_t device_offset, + unsigned int *clu, unsigned int *offset) +{ + off_t heap_offset; + + heap_offset = exfat_s2o(exfat, le32_to_cpu(exfat->bs->bsx.clu_offset)); + if (device_offset < heap_offset) + return -ERANGE; + + *clu = (unsigned int)((device_offset - heap_offset) / + exfat->clus_size) + EXFAT_FIRST_CLUSTER; + if (!exfat_heap_clus(exfat, *clu)) + return -ERANGE; + *offset = (device_offset - heap_offset) % exfat->clus_size; + return 0; +} + +bool exfat_heap_clus(struct exfat *exfat, clus_t clus) +{ + return clus >= EXFAT_FIRST_CLUSTER && + (clus - EXFAT_FIRST_CLUSTER) < exfat->clus_count; +} + +int exfat_root_clus_count(struct exfat *exfat) +{ + struct exfat_inode *node = exfat->root; + clus_t clus, next; + int clus_count = 0; + + if (!exfat_heap_clus(exfat, node->first_clus)) + return -EIO; + + clus = node->first_clus; + do { + if (exfat_bitmap_get(exfat->alloc_bitmap, clus)) + return -EINVAL; + + exfat_bitmap_set(exfat->alloc_bitmap, clus); + + if (exfat_get_inode_next_clus(exfat, node, clus, &next)) { + exfat_err("ERROR: failed to read the fat entry of root"); + return -EIO; + } + + if (next != EXFAT_EOF_CLUSTER && !exfat_heap_clus(exfat, next)) + return -EINVAL; + + clus = next; + clus_count++; + } while (clus != EXFAT_EOF_CLUSTER); + + node->size = clus_count * exfat->clus_size; + return 0; +} + +int read_boot_sect(struct exfat_blk_dev *bdev, struct pbr **bs) +{ + struct pbr *pbr; + int err = 0; + unsigned int sect_size, clu_size; + + pbr = malloc(sizeof(struct pbr)); + + if (exfat_read(bdev->dev_fd, pbr, sizeof(*pbr), 0) != + (ssize_t)sizeof(*pbr)) { + exfat_err("failed to read a boot sector\n"); + err = -EIO; + goto err; + } + + err = -EINVAL; + if (memcmp(pbr->bpb.oem_name, "EXFAT ", 8) != 0) { + exfat_err("failed to find exfat file system\n"); + goto err; + } + + sect_size = 1 << pbr->bsx.sect_size_bits; + clu_size = 1 << (pbr->bsx.sect_size_bits + + pbr->bsx.sect_per_clus_bits); + + if (sect_size < 512 || sect_size > 4 * KB) { + exfat_err("too small or big sector size: %d\n", + sect_size); + goto err; + } + + if (clu_size < sect_size || clu_size > 32 * MB) { + exfat_err("too small or big cluster size: %d\n", + clu_size); + goto err; + } + + *bs = pbr; + return 0; +err: + free(pbr); + return err; +} |