diff options
Diffstat (limited to '')
| -rw-r--r-- | fsck/Android.bp | 12 | ||||
| -rw-r--r-- | fsck/Makefile.am | 6 | ||||
| -rw-r--r-- | fsck/Makefile.in | 645 | ||||
| -rw-r--r-- | fsck/fsck.c | 1681 | ||||
| -rw-r--r-- | fsck/fsck.h | 35 | ||||
| -rw-r--r-- | fsck/repair.c | 159 | ||||
| -rw-r--r-- | fsck/repair.h | 33 |
7 files changed, 2571 insertions, 0 deletions
diff --git a/fsck/Android.bp b/fsck/Android.bp new file mode 100644 index 0000000..7473fea --- /dev/null +++ b/fsck/Android.bp @@ -0,0 +1,12 @@ +// Copyright 2020 The Android Open Source Project + +cc_binary { + name: "fsck.exfat", + + srcs: [ + "fsck.c", + "repair.c", + ], + defaults: ["exfatprogs-defaults"], + static_libs: ["libexfat"], +} diff --git a/fsck/Makefile.am b/fsck/Makefile.am new file mode 100644 index 0000000..519b13a --- /dev/null +++ b/fsck/Makefile.am @@ -0,0 +1,6 @@ +AM_CFLAGS = -Wall -Wextra -include $(top_builddir)/config.h -I$(top_srcdir)/include -fno-common +fsck_exfat_LDADD = $(top_builddir)/lib/libexfat.a + +sbin_PROGRAMS = fsck.exfat + +fsck_exfat_SOURCES = fsck.c repair.c fsck.h repair.h diff --git a/fsck/Makefile.in b/fsck/Makefile.in new file mode 100644 index 0000000..1e32a5d --- /dev/null +++ b/fsck/Makefile.in @@ -0,0 +1,645 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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\ + else \ + $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \ + install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \ + "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \ + fi +mostlyclean-generic: + +clean-generic: + +distclean-generic: + -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES) + -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES) + +maintainer-clean-generic: + @echo "This command is intended for maintainers to use" + @echo "it deletes files that may require special tools to rebuild." +clean: clean-am + +clean-am: clean-generic clean-libtool clean-sbinPROGRAMS \ + mostlyclean-am + +distclean: distclean-am + -rm -f ./$(DEPDIR)/fsck.Po + -rm -f ./$(DEPDIR)/repair.Po + -rm -f Makefile +distclean-am: clean-am distclean-compile distclean-generic \ + distclean-tags + +dvi: dvi-am + +dvi-am: + +html: html-am + +html-am: + +info: info-am + +info-am: + +install-data-am: + +install-dvi: install-dvi-am + +install-dvi-am: + +install-exec-am: install-sbinPROGRAMS + +install-html: install-html-am + +install-html-am: + +install-info: install-info-am + +install-info-am: + +install-man: + +install-pdf: install-pdf-am + +install-pdf-am: + +install-ps: install-ps-am + +install-ps-am: + +installcheck-am: + +maintainer-clean: maintainer-clean-am + -rm -f ./$(DEPDIR)/fsck.Po + -rm -f ./$(DEPDIR)/repair.Po + -rm -f Makefile +maintainer-clean-am: distclean-am maintainer-clean-generic + +mostlyclean: mostlyclean-am + +mostlyclean-am: mostlyclean-compile mostlyclean-generic \ + mostlyclean-libtool + +pdf: pdf-am + +pdf-am: + +ps: ps-am + +ps-am: + +uninstall-am: uninstall-sbinPROGRAMS + +.MAKE: install-am install-strip + +.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \ + clean-generic clean-libtool clean-sbinPROGRAMS cscopelist-am \ + ctags ctags-am distclean distclean-compile distclean-generic \ + distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-pdf install-pdf-am \ + install-ps install-ps-am install-sbinPROGRAMS install-strip \ + installcheck installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags tags-am uninstall uninstall-am uninstall-sbinPROGRAMS + +.PRECIOUS: Makefile + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/fsck/fsck.c b/fsck/fsck.c new file mode 100644 index 0000000..219d723 --- /dev/null +++ b/fsck/fsck.c @@ -0,0 +1,1681 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org> + * Copyright (C) 2020 Hyunchul Lee <hyc.lee@gmail.com> + */ + +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <getopt.h> +#include <inttypes.h> +#include <string.h> +#include <errno.h> +#include <locale.h> + +#include "exfat_ondisk.h" +#include "libexfat.h" +#include "repair.h" +#include "exfat_fs.h" +#include "exfat_dir.h" +#include "fsck.h" + +struct fsck_user_input { + struct exfat_user_input ei; + enum fsck_ui_options options; +}; + +#define EXFAT_MAX_UPCASE_CHARS 0x10000 + +#define FSCK_EXIT_NO_ERRORS 0x00 +#define FSCK_EXIT_CORRECTED 0x01 +#define FSCK_EXIT_NEED_REBOOT 0x02 +#define FSCK_EXIT_ERRORS_LEFT 0x04 +#define FSCK_EXIT_OPERATION_ERROR 0x08 +#define FSCK_EXIT_SYNTAX_ERROR 0x10 +#define FSCK_EXIT_USER_CANCEL 0x20 +#define FSCK_EXIT_LIBRARY_ERROR 0x80 + +struct exfat_stat { + long dir_count; + long file_count; + long error_count; + long fixed_count; +}; + +struct exfat_fsck exfat_fsck; +struct exfat_stat exfat_stat; +struct path_resolve_ctx path_resolve_ctx; + +static struct option opts[] = { + {"repair", no_argument, NULL, 'r' }, + {"repair-yes", no_argument, NULL, 'y' }, + {"repair-no", no_argument, NULL, 'n' }, + {"repair-auto", no_argument, NULL, 'p' }, + {"rescue", no_argument, NULL, 's' }, + {"version", no_argument, NULL, 'V' }, + {"verbose", no_argument, NULL, 'v' }, + {"help", no_argument, NULL, 'h' }, + {"?", no_argument, NULL, '?' }, + {"ignore-bad-fs", no_argument, NULL, 'b' }, + {NULL, 0, NULL, 0 } +}; + +static void usage(char *name) +{ + fprintf(stderr, "Usage: %s\n", name); + fprintf(stderr, "\t-r | --repair Repair interactively\n"); + fprintf(stderr, "\t-y | --repair-yes Repair without ask\n"); + fprintf(stderr, "\t-n | --repair-no No repair\n"); + fprintf(stderr, "\t-p | --repair-auto Repair automatically\n"); + fprintf(stderr, "\t-a Repair automatically\n"); + fprintf(stderr, "\t-b | --ignore-bad-fs Try to recover even if exfat is not found\n"); + fprintf(stderr, "\t-s | --rescue Assign orphaned clusters to files\n"); + fprintf(stderr, "\t-V | --version Show version\n"); + fprintf(stderr, "\t-v | --verbose Print debug\n"); + fprintf(stderr, "\t-h | --help Show help\n"); + + exit(FSCK_EXIT_SYNTAX_ERROR); +} + +#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__); \ +}) + +#define repair_file_ask(iter, inode, code, fmt, ...) \ +({ \ + if (inode) \ + exfat_resolve_path_parent(&path_resolve_ctx, \ + (iter)->parent, inode); \ + else \ + exfat_resolve_path(&path_resolve_ctx, \ + (iter)->parent); \ + exfat_repair_ask(&exfat_fsck, code, \ + "ERROR: %s: " fmt " at %#" PRIx64, \ + path_resolve_ctx.local_path, \ + ##__VA_ARGS__, \ + exfat_de_iter_device_offset(iter)); \ +}) + +static int check_clus_chain(struct exfat_de_iter *de_iter, + struct exfat_inode *node) +{ + struct exfat *exfat = de_iter->exfat; + struct exfat_dentry *stream_de; + clus_t clus, prev, next; + uint64_t count, max_count; + + clus = node->first_clus; + prev = EXFAT_EOF_CLUSTER; + count = 0; + max_count = DIV_ROUND_UP(node->size, exfat->clus_size); + + if (node->size == 0 && node->first_clus == EXFAT_FREE_CLUSTER) + return 0; + + /* the first cluster is wrong */ + if ((node->size == 0 && node->first_clus != EXFAT_FREE_CLUSTER) || + (node->size > 0 && !exfat_heap_clus(exfat, node->first_clus))) { + if (repair_file_ask(de_iter, node, + ER_FILE_FIRST_CLUS, + "size %#" PRIx64 ", but the first cluster %#x", + node->size, node->first_clus)) + goto truncate_file; + else + return -EINVAL; + } + + while (clus != EXFAT_EOF_CLUSTER) { + if (count >= max_count) { + if (node->is_contiguous) + break; + if (repair_file_ask(de_iter, node, + ER_FILE_SMALLER_SIZE, + "more clusters are allocated. truncate to %" + PRIu64 " bytes", + count * exfat->clus_size)) + goto truncate_file; + else + return -EINVAL; + } + + /* + * This cluster is already allocated. it may be shared with + * the other file, or there is a loop in cluster chain. + */ + if (exfat_bitmap_get(exfat->alloc_bitmap, clus)) { + if (repair_file_ask(de_iter, node, + ER_FILE_DUPLICATED_CLUS, + "cluster is already allocated for the other file. truncated to %" + PRIu64 " bytes", + count * exfat->clus_size)) + goto truncate_file; + else + return -EINVAL; + } + + if (!exfat_bitmap_get(exfat->disk_bitmap, clus)) { + if (!repair_file_ask(de_iter, node, + ER_FILE_INVALID_CLUS, + "cluster %#x is marked as free", + clus)) + return -EINVAL; + } + + /* This cluster is allocated or not */ + if (exfat_get_inode_next_clus(exfat, node, clus, &next)) + goto truncate_file; + if (next == EXFAT_BAD_CLUSTER) { + if (repair_file_ask(de_iter, node, + ER_FILE_INVALID_CLUS, + "BAD cluster. truncate to %" + PRIu64 " bytes", + count * exfat->clus_size)) + goto truncate_file; + else + return -EINVAL; + } else if (!node->is_contiguous) { + if (next != EXFAT_EOF_CLUSTER && + !exfat_heap_clus(exfat, next)) { + if (repair_file_ask(de_iter, node, + ER_FILE_INVALID_CLUS, + "broken cluster chain. truncate to %" + PRIu64 " bytes", + (count + 1) * exfat->clus_size)) { + count++; + prev = clus; + exfat_bitmap_set(exfat->alloc_bitmap, + clus); + goto truncate_file; + } else { + return -EINVAL; + } + } + } + + count++; + exfat_bitmap_set(exfat->alloc_bitmap, clus); + prev = clus; + clus = next; + } + + if (count < max_count) { + if (repair_file_ask(de_iter, node, ER_FILE_LARGER_SIZE, + "less clusters are allocated. truncates to %" + PRIu64 " bytes", + count * exfat->clus_size)) + goto truncate_file; + else + return -EINVAL; + } + + return 0; +truncate_file: + node->size = count * exfat->clus_size; + if (!exfat_heap_clus(exfat, prev)) + node->first_clus = EXFAT_FREE_CLUSTER; + + exfat_de_iter_get_dirty(de_iter, 1, &stream_de); + if (count * exfat->clus_size < + le64_to_cpu(stream_de->stream_valid_size)) + stream_de->stream_valid_size = cpu_to_le64( + count * exfat->clus_size); + if (!exfat_heap_clus(exfat, prev)) + stream_de->stream_start_clu = EXFAT_FREE_CLUSTER; + stream_de->stream_size = cpu_to_le64( + count * exfat->clus_size); + + /* remaining clusters will be freed while FAT is compared with + * alloc_bitmap. + */ + if (!node->is_contiguous && exfat_heap_clus(exfat, prev)) { + if (exfat_set_fat(exfat, prev, EXFAT_EOF_CLUSTER)) + return -EIO; + } + return 1; +} + +static int root_check_clus_chain(struct exfat *exfat, + struct exfat_inode *node, + clus_t *clus_count) +{ + clus_t clus, next, prev = EXFAT_EOF_CLUSTER; + + if (!exfat_heap_clus(exfat, node->first_clus)) + goto out_trunc; + + clus = node->first_clus; + *clus_count = 0; + + do { + if (exfat_bitmap_get(exfat->alloc_bitmap, clus)) { + if (exfat_repair_ask(&exfat_fsck, + ER_FILE_DUPLICATED_CLUS, + "ERROR: the cluster chain of root is cyclic")) + goto out_trunc; + 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"); + goto out_trunc; + } + + if (next != EXFAT_EOF_CLUSTER && !exfat_heap_clus(exfat, next)) { + if (exfat_repair_ask(&exfat_fsck, + ER_FILE_INVALID_CLUS, + "ERROR: the cluster chain of root is broken")) { + if (next != EXFAT_BAD_CLUSTER) { + prev = clus; + (*clus_count)++; + } + goto out_trunc; + } + return -EINVAL; + } + + prev = clus; + clus = next; + (*clus_count)++; + } while (clus != EXFAT_EOF_CLUSTER); + + return 0; +out_trunc: + if (!exfat_heap_clus(exfat, prev)) { + exfat_err("ERROR: the start cluster of root is wrong\n"); + return -EINVAL; + } + node->size = *clus_count * exfat->clus_size; + return exfat_set_fat(exfat, prev, EXFAT_EOF_CLUSTER); +} + +static int boot_region_checksum(int dev_fd, + int bs_offset, unsigned int sect_size) +{ + void *sect; + unsigned int i; + uint32_t checksum; + int ret = 0; + + sect = malloc(sect_size); + if (!sect) + return -ENOMEM; + + checksum = 0; + for (i = 0; i < 11; i++) { + if (exfat_read(dev_fd, sect, sect_size, + bs_offset * sect_size + i * sect_size) != + (ssize_t)sect_size) { + exfat_err("failed to read boot region\n"); + ret = -EIO; + goto out; + } + boot_calc_checksum(sect, sect_size, i == 0, &checksum); + } + + if (exfat_read(dev_fd, sect, sect_size, + bs_offset * sect_size + 11 * sect_size) != + (ssize_t)sect_size) { + exfat_err("failed to read a boot checksum sector\n"); + ret = -EIO; + goto out; + } + + for (i = 0; i < sect_size/sizeof(checksum); i++) { + if (le32_to_cpu(((__le32 *)sect)[i]) != checksum) { + exfat_err("checksum of boot region is not correct. %#x, but expected %#x\n", + le32_to_cpu(((__le32 *)sect)[i]), checksum); + ret = -EINVAL; + goto out; + } + } +out: + free(sect); + return ret; +} + +static int exfat_mark_volume_dirty(struct exfat *exfat, bool dirty) +{ + uint16_t flags; + + flags = le16_to_cpu(exfat->bs->bsx.vol_flags); + if (dirty) + flags |= 0x02; + else + flags &= ~0x02; + + exfat->bs->bsx.vol_flags = cpu_to_le16(flags); + if (exfat_write(exfat->blk_dev->dev_fd, exfat->bs, + sizeof(struct pbr), 0) != (ssize_t)sizeof(struct pbr)) { + exfat_err("failed to set VolumeDirty\n"); + return -EIO; + } + + if (fsync(exfat->blk_dev->dev_fd) != 0) { + exfat_err("failed to set VolumeDirty\n"); + return -EIO; + } + return 0; +} + +static int read_boot_region(struct exfat_blk_dev *bd, struct pbr **pbr, + int bs_offset, unsigned int sect_size, + bool verbose) +{ + struct pbr *bs; + int ret = -EINVAL; + + *pbr = NULL; + bs = (struct pbr *)malloc(sizeof(struct pbr)); + if (!bs) { + exfat_err("failed to allocate memory\n"); + return -ENOMEM; + } + + if (exfat_read(bd->dev_fd, bs, sizeof(*bs), + bs_offset * sect_size) != (ssize_t)sizeof(*bs)) { + exfat_err("failed to read a boot sector\n"); + ret = -EIO; + goto err; + } + + if (memcmp(bs->bpb.oem_name, "EXFAT ", 8) != 0) { + if (verbose) + exfat_err("failed to find exfat file system\n"); + goto err; + } + + ret = boot_region_checksum(bd->dev_fd, bs_offset, sect_size); + if (ret < 0) + goto err; + + ret = -EINVAL; + if (EXFAT_SECTOR_SIZE(bs) < 512 || EXFAT_SECTOR_SIZE(bs) > 4 * KB) { + if (verbose) + exfat_err("too small or big sector size: %d\n", + EXFAT_SECTOR_SIZE(bs)); + goto err; + } + + if (EXFAT_CLUSTER_SIZE(bs) > 32 * MB) { + if (verbose) + exfat_err("too big cluster size: %d\n", + EXFAT_CLUSTER_SIZE(bs)); + goto err; + } + + if (bs->bsx.fs_version[1] != 1 || bs->bsx.fs_version[0] != 0) { + if (verbose) + exfat_err("unsupported exfat version: %d.%d\n", + bs->bsx.fs_version[1], bs->bsx.fs_version[0]); + goto err; + } + + if (bs->bsx.num_fats != 1) { + if (verbose) + exfat_err("unsupported FAT count: %d\n", + bs->bsx.num_fats); + goto err; + } + + if (le64_to_cpu(bs->bsx.vol_length) * EXFAT_SECTOR_SIZE(bs) > + bd->size) { + if (verbose) + exfat_err("too large sector count: %" PRIu64 ", expected: %llu\n", + le64_to_cpu(bs->bsx.vol_length), + bd->num_sectors); + goto err; + } + + if (le32_to_cpu(bs->bsx.clu_count) * EXFAT_CLUSTER_SIZE(bs) > + bd->size) { + if (verbose) + exfat_err("too large cluster count: %u, expected: %u\n", + le32_to_cpu(bs->bsx.clu_count), + bd->num_clusters); + goto err; + } + + *pbr = bs; + return 0; +err: + free(bs); + return ret; +} + +static int restore_boot_region(struct exfat_blk_dev *bd, unsigned int sect_size) +{ + int i; + char *sector; + int ret; + + sector = malloc(sect_size); + if (!sector) + return -ENOMEM; + + for (i = 0; i < 12; i++) { + if (exfat_read(bd->dev_fd, sector, sect_size, + BACKUP_BOOT_SEC_IDX * sect_size + + i * sect_size) != + (ssize_t)sect_size) { + ret = -EIO; + goto free_sector; + } + if (i == 0) + ((struct pbr *)sector)->bsx.perc_in_use = 0xff; + + if (exfat_write(bd->dev_fd, sector, sect_size, + BOOT_SEC_IDX * sect_size + + i * sect_size) != + (ssize_t)sect_size) { + ret = -EIO; + goto free_sector; + } + } + + if (fsync(bd->dev_fd)) { + ret = -EIO; + goto free_sector; + } + ret = 0; + +free_sector: + free(sector); + return ret; +} + +static int exfat_boot_region_check(struct exfat_blk_dev *blkdev, + struct pbr **bs, + bool ignore_bad_fs_name) +{ + struct pbr *boot_sect; + unsigned int sect_size; + int ret; + + /* First, find out the exfat sector size */ + boot_sect = malloc(sizeof(*boot_sect)); + if (boot_sect == NULL) + return -ENOMEM; + + if (exfat_read(blkdev->dev_fd, boot_sect, + sizeof(*boot_sect), 0) != (ssize_t)sizeof(*boot_sect)) { + exfat_err("failed to read Main boot sector\n"); + free(boot_sect); + return -EIO; + } + + if (memcmp(boot_sect->bpb.oem_name, "EXFAT ", 8) != 0 && + !ignore_bad_fs_name) { + exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n"); + free(boot_sect); + return -ENOTSUP; + } + + sect_size = 1 << boot_sect->bsx.sect_size_bits; + free(boot_sect); + + /* check boot regions */ + ret = read_boot_region(blkdev, bs, + BOOT_SEC_IDX, sect_size, true); + if (ret == -EINVAL && + exfat_repair_ask(&exfat_fsck, ER_BS_BOOT_REGION, + "boot region is corrupted. try to restore the region from backup" + )) { + const unsigned int sector_sizes[] = {512, 4096, 1024, 2048}; + unsigned int i; + + if (sect_size >= 512 && sect_size <= EXFAT_MAX_SECTOR_SIZE) { + ret = read_boot_region(blkdev, bs, + BACKUP_BOOT_SEC_IDX, sect_size, + false); + if (!ret) + goto restore; + } + + for (i = 0; i < sizeof(sector_sizes)/sizeof(sector_sizes[0]); i++) { + if (sector_sizes[i] == sect_size) + continue; + + ret = read_boot_region(blkdev, bs, + BACKUP_BOOT_SEC_IDX, + sector_sizes[i], false); + if (!ret) { + sect_size = sector_sizes[i]; + goto restore; + } + } + exfat_err("backup boot region is also corrupted\n"); + } + + return ret; +restore: + ret = restore_boot_region(blkdev, sect_size); + if (ret) { + exfat_err("failed to restore boot region from backup\n"); + free(*bs); + *bs = NULL; + } + return ret; +} + +static uint16_t file_calc_checksum(struct exfat_de_iter *iter) +{ + uint16_t checksum; + struct exfat_dentry *file_de, *de; + int i; + + checksum = 0; + exfat_de_iter_get(iter, 0, &file_de); + + exfat_calc_dentry_checksum(file_de, &checksum, true); + for (i = 1; i <= file_de->file_num_ext; i++) { + exfat_de_iter_get(iter, i, &de); + exfat_calc_dentry_checksum(de, &checksum, false); + } + return checksum; +} + +/* + * return 0 if there are no errors, or 1 if errors are fixed, or + * an error code + */ +static int check_inode(struct exfat_de_iter *iter, struct exfat_inode *node) +{ + struct exfat *exfat = iter->exfat; + struct exfat_dentry *dentry; + int ret = 0; + uint16_t checksum; + bool valid = true; + + ret = check_clus_chain(iter, node); + if (ret < 0) + return ret; + + if (node->size > le32_to_cpu(exfat->bs->bsx.clu_count) * + (uint64_t)exfat->clus_size) { + fsck_err(iter->parent, node, + "size %" PRIu64 " is greater than cluster heap\n", + node->size); + valid = false; + } + + if (node->size == 0 && node->is_contiguous) { + if (repair_file_ask(iter, node, ER_FILE_ZERO_NOFAT, + "empty, but has no Fat chain")) { + exfat_de_iter_get_dirty(iter, 1, &dentry); + dentry->stream_flags &= ~EXFAT_SF_CONTIGUOUS; + ret = 1; + } else + valid = false; + } + + if ((node->attr & ATTR_SUBDIR) && + node->size % exfat->clus_size != 0) { + fsck_err(iter->parent, node, + "directory size %" PRIu64 " is not divisible by %d\n", + node->size, exfat->clus_size); + valid = false; + } + + checksum = file_calc_checksum(iter); + exfat_de_iter_get(iter, 0, &dentry); + if (checksum != le16_to_cpu(dentry->file_checksum)) { + exfat_de_iter_get_dirty(iter, 0, &dentry); + dentry->file_checksum = cpu_to_le16(checksum); + ret = 1; + } + + return valid ? ret : -EINVAL; +} + +static int check_name_dentry_set(struct exfat_de_iter *iter, + struct exfat_inode *inode) +{ + struct exfat_dentry *stream_de; + size_t name_len; + __u16 hash; + + exfat_de_iter_get(iter, 1, &stream_de); + + name_len = exfat_utf16_len(inode->name, NAME_BUFFER_SIZE); + if (stream_de->stream_name_len != name_len) { + if (repair_file_ask(iter, NULL, ER_DE_NAME_LEN, + "the name length of a file is wrong")) { + exfat_de_iter_get_dirty(iter, 1, &stream_de); + stream_de->stream_name_len = (__u8)name_len; + } else { + return -EINVAL; + } + } + + hash = exfat_calc_name_hash(iter->exfat, inode->name, (int)name_len); + if (cpu_to_le16(hash) != stream_de->stream_name_hash) { + if (repair_file_ask(iter, NULL, ER_DE_NAME_HASH, + "the name hash of a file is wrong")) { + exfat_de_iter_get_dirty(iter, 1, &stream_de); + stream_de->stream_name_hash = cpu_to_le16(hash); + } else { + return -EINVAL; + } + } + return 0; +} + +static int check_bad_char(char w) +{ + return (w < 0x0020) || (w == '*') || (w == '?') || (w == '<') || + (w == '>') || (w == '|') || (w == '"') || (w == ':') || + (w == '/') || (w == '\\'); +} + +static char *get_rename_from_user(struct exfat_de_iter *iter) +{ + char *rename = malloc(ENTRY_NAME_MAX + 2); + + if (!rename) + return NULL; + +retry: + /* +2 means LF(Line Feed) and NULL terminator */ + memset(rename, 0x1, ENTRY_NAME_MAX + 2); + printf("New name: "); + if (fgets(rename, ENTRY_NAME_MAX + 2, stdin)) { + int i, len, err; + struct exfat_lookup_filter filter; + + len = strlen(rename); + /* Remove LF in filename */ + rename[len - 1] = '\0'; + for (i = 0; i < len - 1; i++) { + if (check_bad_char(rename[i])) { + printf("filename contain invalid character(%c)\n", rename[i]); + goto retry; + } + } + + exfat_de_iter_flush(iter); + err = exfat_lookup_file(iter->exfat, iter->parent, rename, &filter); + if (!err) { + printf("file(%s) already exists, retry to insert name\n", rename); + goto retry; + } + } + + return rename; +} + +static char *generate_rename(struct exfat_de_iter *iter) +{ + char *rename; + + if (iter->dot_name_num > DOT_NAME_NUM_MAX) + return NULL; + + rename = malloc(ENTRY_NAME_MAX + 1); + if (!rename) + return NULL; + + while (1) { + struct exfat_lookup_filter filter; + int err; + + snprintf(rename, ENTRY_NAME_MAX + 1, "FILE%07d.CHK", + iter->dot_name_num++); + err = exfat_lookup_file(iter->exfat, iter->parent, rename, + &filter); + if (!err) + continue; + break; + } + + return rename; +} + +const __le16 MSDOS_DOT[ENTRY_NAME_MAX] = {cpu_to_le16(46), 0, }; +const __le16 MSDOS_DOTDOT[ENTRY_NAME_MAX] = {cpu_to_le16(46), cpu_to_le16(46), 0, }; + +static int handle_dot_dotdot_filename(struct exfat_de_iter *iter, + struct exfat_dentry *dentry, + int strm_name_len) +{ + char *filename; + char error_msg[150]; + int num; + + if (!memcmp(dentry->name_unicode, MSDOS_DOT, strm_name_len * 2)) + filename = "."; + else if (!memcmp(dentry->name_unicode, MSDOS_DOTDOT, + strm_name_len * 2)) + filename = ".."; + else + return 0; + + sprintf(error_msg, "ERROR: '%s' filename is not allowed.\n" + " [1] Insert the name you want to rename.\n" + " [2] Automatically renames filename.\n" + " [3] Bypass this check(No repair)\n", filename); +ask_again: + num = exfat_repair_ask(&exfat_fsck, ER_DE_DOT_NAME, + error_msg); + if (num) { + __le16 utf16_name[ENTRY_NAME_MAX]; + char *rename = NULL; + __u16 hash; + struct exfat_dentry *stream_de; + int name_len, ret; + + switch (num) { + case 1: + rename = get_rename_from_user(iter); + break; + case 2: + rename = generate_rename(iter); + break; + case 3: + break; + default: + exfat_info("select 1 or 2 number instead of %d\n", num); + goto ask_again; + } + + if (!rename) + return -EINVAL; + + exfat_info("%s filename is renamed to %s\n", filename, rename); + + exfat_de_iter_get_dirty(iter, 2, &dentry); + + memset(utf16_name, 0, sizeof(utf16_name)); + ret = exfat_utf16_enc(rename, utf16_name, sizeof(utf16_name)); + free(rename); + if (ret < 0) + return ret; + + memcpy(dentry->name_unicode, utf16_name, ENTRY_NAME_MAX * 2); + name_len = exfat_utf16_len(utf16_name, ENTRY_NAME_MAX * 2); + hash = exfat_calc_name_hash(iter->exfat, utf16_name, (int)name_len); + exfat_de_iter_get_dirty(iter, 1, &stream_de); + stream_de->stream_name_len = (__u8)name_len; + stream_de->stream_name_hash = cpu_to_le16(hash); + } + + return 0; +} + +static int read_file_dentry_set(struct exfat_de_iter *iter, + struct exfat_inode **new_node, int *skip_dentries) +{ + struct exfat_dentry *file_de, *stream_de, *dentry; + struct exfat_inode *node = NULL; + int i, ret; + bool need_delete = false; + uint16_t checksum; + + ret = exfat_de_iter_get(iter, 0, &file_de); + if (ret || file_de->type != EXFAT_FILE) { + exfat_err("failed to get file dentry\n"); + return -EINVAL; + } + + checksum = file_calc_checksum(iter); + if (checksum != le16_to_cpu(file_de->file_checksum)) { + if (repair_file_ask(iter, NULL, ER_DE_CHECKSUM, + "the checksum of a file is wrong")) + need_delete = true; + *skip_dentries = 1; + goto skip_dset; + } + + if (file_de->file_num_ext < 2) { + if (repair_file_ask(iter, NULL, ER_DE_SECONDARY_COUNT, + "a file has too few secondary count. %d", + file_de->file_num_ext)) + need_delete = true; + *skip_dentries = 1; + goto skip_dset; + } + + ret = exfat_de_iter_get(iter, 1, &stream_de); + if (ret || stream_de->type != EXFAT_STREAM) { + if (repair_file_ask(iter, NULL, ER_DE_STREAM, + "failed to get stream dentry")) + need_delete = true; + *skip_dentries = 2; + goto skip_dset; + } + + *new_node = NULL; + node = exfat_alloc_inode(le16_to_cpu(file_de->file_attr)); + if (!node) + return -ENOMEM; + + for (i = 2; i <= file_de->file_num_ext; i++) { + ret = exfat_de_iter_get(iter, i, &dentry); + if (ret || dentry->type != EXFAT_NAME) { + if (i > 2 && repair_file_ask(iter, NULL, ER_DE_NAME, + "failed to get name dentry")) { + exfat_de_iter_get_dirty(iter, 0, &file_de); + file_de->file_num_ext = i - 1; + break; + } + *skip_dentries = i + 1; + goto skip_dset; + } + + memcpy(node->name + + (i - 2) * ENTRY_NAME_MAX, dentry->name_unicode, + sizeof(dentry->name_unicode)); + } + + ret = check_name_dentry_set(iter, node); + if (ret) { + *skip_dentries = file_de->file_num_ext + 1; + goto skip_dset; + } + + if (file_de->file_num_ext == 2 && stream_de->stream_name_len <= 2) { + ret = handle_dot_dotdot_filename(iter, dentry, + stream_de->stream_name_len); + if (ret < 0) { + *skip_dentries = file_de->file_num_ext + 1; + goto skip_dset; + } + } + + node->first_clus = le32_to_cpu(stream_de->stream_start_clu); + node->is_contiguous = + ((stream_de->stream_flags & EXFAT_SF_CONTIGUOUS) != 0); + node->size = le64_to_cpu(stream_de->stream_size); + + if (node->size < le64_to_cpu(stream_de->stream_valid_size)) { + *skip_dentries = file_de->file_num_ext + 1; + if (repair_file_ask(iter, node, ER_FILE_VALID_SIZE, + "valid size %" PRIu64 " greater than size %" PRIu64, + le64_to_cpu(stream_de->stream_valid_size), + node->size)) { + exfat_de_iter_get_dirty(iter, 1, &stream_de); + stream_de->stream_valid_size = + stream_de->stream_size; + } else { + *skip_dentries = file_de->file_num_ext + 1; + goto skip_dset; + } + } + + *skip_dentries = (file_de->file_num_ext + 1); + *new_node = node; + return 0; +skip_dset: + if (need_delete) { + exfat_de_iter_get_dirty(iter, 0, &dentry); + dentry->type &= EXFAT_DELETE; + } + for (i = 1; i < *skip_dentries; i++) { + exfat_de_iter_get(iter, i, &dentry); + if (dentry->type == EXFAT_FILE) + break; + if (need_delete) { + exfat_de_iter_get_dirty(iter, i, &dentry); + dentry->type &= EXFAT_DELETE; + } + } + *skip_dentries = i; + *new_node = NULL; + exfat_free_inode(node); + return need_delete ? 1 : -EINVAL; +} + +static int read_file(struct exfat_de_iter *de_iter, + struct exfat_inode **new_node, int *dentry_count) +{ + struct exfat_inode *node; + int ret; + + *new_node = NULL; + + ret = read_file_dentry_set(de_iter, &node, dentry_count); + if (ret) + return ret; + + ret = check_inode(de_iter, node); + if (ret < 0) { + exfat_free_inode(node); + return -EINVAL; + } + + if (node->attr & ATTR_SUBDIR) + exfat_stat.dir_count++; + else + exfat_stat.file_count++; + *new_node = node; + return ret; +} + +static int read_bitmap(struct exfat *exfat) +{ + struct exfat_lookup_filter filter = { + .in.type = EXFAT_BITMAP, + .in.filter = NULL, + .in.param = NULL, + }; + struct exfat_dentry *dentry; + int retval; + + retval = exfat_lookup_dentry_set(exfat, exfat->root, &filter); + if (retval) + return retval; + + dentry = filter.out.dentry_set; + exfat_debug("start cluster %#x, size %#" PRIx64 "\n", + le32_to_cpu(dentry->bitmap_start_clu), + le64_to_cpu(dentry->bitmap_size)); + + if (le64_to_cpu(dentry->bitmap_size) < + DIV_ROUND_UP(exfat->clus_count, 8)) { + exfat_err("invalid size of allocation bitmap. 0x%" PRIx64 "\n", + le64_to_cpu(dentry->bitmap_size)); + return -EINVAL; + } + if (!exfat_heap_clus(exfat, le32_to_cpu(dentry->bitmap_start_clu))) { + exfat_err("invalid start cluster of allocate bitmap. 0x%x\n", + le32_to_cpu(dentry->bitmap_start_clu)); + return -EINVAL; + } + + exfat->disk_bitmap_clus = le32_to_cpu(dentry->bitmap_start_clu); + exfat->disk_bitmap_size = DIV_ROUND_UP(exfat->clus_count, 8); + + exfat_bitmap_set_range(exfat, exfat->alloc_bitmap, + le64_to_cpu(dentry->bitmap_start_clu), + DIV_ROUND_UP(exfat->disk_bitmap_size, + exfat->clus_size)); + free(filter.out.dentry_set); + + if (exfat_read(exfat->blk_dev->dev_fd, exfat->disk_bitmap, + exfat->disk_bitmap_size, + exfat_c2o(exfat, exfat->disk_bitmap_clus)) != + (ssize_t)exfat->disk_bitmap_size) + return -EIO; + return 0; +} + +static int decompress_upcase_table(const __le16 *in_table, size_t in_len, + __u16 *out_table, size_t out_len) +{ + size_t i, k; + uint16_t ch; + + if (in_len > out_len) + return -E2BIG; + + for (k = 0; k < out_len; k++) + out_table[k] = k; + + for (i = 0, k = 0; i < in_len && k < out_len; i++) { + ch = le16_to_cpu(in_table[i]); + + if (ch == 0xFFFF && i + 1 < in_len) { + uint16_t len = le16_to_cpu(in_table[++i]); + + k += len; + } else { + out_table[k++] = ch; + } + } + return 0; +} + +static int read_upcase_table(struct exfat *exfat) +{ + struct exfat_lookup_filter filter = { + .in.type = EXFAT_UPCASE, + .in.filter = NULL, + .in.param = NULL, + }; + struct exfat_dentry *dentry = NULL; + __le16 *upcase = NULL; + int retval; + ssize_t size; + __le32 checksum; + + retval = exfat_lookup_dentry_set(exfat, exfat->root, &filter); + if (retval) + return retval; + + dentry = filter.out.dentry_set; + + if (!exfat_heap_clus(exfat, le32_to_cpu(dentry->upcase_start_clu))) { + exfat_err("invalid start cluster of upcase table. 0x%x\n", + le32_to_cpu(dentry->upcase_start_clu)); + retval = -EINVAL; + goto out; + } + + size = (ssize_t)le64_to_cpu(dentry->upcase_size); + if (size > (ssize_t)(EXFAT_MAX_UPCASE_CHARS * sizeof(__le16)) || + size == 0 || size % sizeof(__le16)) { + exfat_err("invalid size of upcase table. 0x%" PRIx64 "\n", + le64_to_cpu(dentry->upcase_size)); + retval = -EINVAL; + goto out; + } + + upcase = (__le16 *)malloc(size); + if (!upcase) { + exfat_err("failed to allocate upcase table\n"); + retval = -ENOMEM; + goto out; + } + + if (exfat_read(exfat->blk_dev->dev_fd, upcase, size, + exfat_c2o(exfat, + le32_to_cpu(dentry->upcase_start_clu))) != size) { + exfat_err("failed to read upcase table\n"); + retval = -EIO; + goto out; + } + + checksum = 0; + boot_calc_checksum((unsigned char *)upcase, size, false, &checksum); + if (le32_to_cpu(dentry->upcase_checksum) != checksum) { + exfat_err("corrupted upcase table %#x (expected: %#x)\n", + checksum, le32_to_cpu(dentry->upcase_checksum)); + retval = -EINVAL; + goto out; + } + + exfat_bitmap_set_range(exfat, exfat->alloc_bitmap, + le32_to_cpu(dentry->upcase_start_clu), + DIV_ROUND_UP(le64_to_cpu(dentry->upcase_size), + exfat->clus_size)); + + exfat->upcase_table = calloc(1, + sizeof(uint16_t) * EXFAT_UPCASE_TABLE_CHARS); + if (!exfat->upcase_table) { + retval = -EIO; + goto out; + } + + decompress_upcase_table(upcase, size / 2, + exfat->upcase_table, EXFAT_UPCASE_TABLE_CHARS); +out: + if (dentry) + free(dentry); + if (upcase) + free(upcase); + return retval; +} + +static int read_children(struct exfat_fsck *fsck, struct exfat_inode *dir) +{ + struct exfat *exfat = fsck->exfat; + struct exfat_inode *node = NULL; + struct exfat_dentry *dentry; + struct exfat_de_iter *de_iter; + int dentry_count; + int ret; + + de_iter = &fsck->de_iter; + ret = exfat_de_iter_init(de_iter, exfat, dir, fsck->buffer_desc); + if (ret == EOF) + return 0; + else if (ret) + return ret; + + while (1) { + ret = exfat_de_iter_get(de_iter, 0, &dentry); + if (ret == EOF) { + break; + } else if (ret) { + fsck_err(dir->parent, dir, + "failed to get a dentry. %d\n", ret); + goto err; + } + + dentry_count = 1; + + switch (dentry->type) { + case EXFAT_FILE: + ret = read_file(de_iter, &node, &dentry_count); + if (ret < 0) { + exfat_stat.error_count++; + break; + } else if (ret) { + exfat_stat.error_count++; + exfat_stat.fixed_count++; + } + + if (node) { + if ((node->attr & ATTR_SUBDIR) && node->size) { + node->parent = dir; + list_add_tail(&node->sibling, + &dir->children); + list_add_tail(&node->list, + &exfat->dir_list); + } else { + exfat_free_inode(node); + } + } + break; + case EXFAT_LAST: + goto out; + case EXFAT_VOLUME: + case EXFAT_BITMAP: + case EXFAT_UPCASE: + if (dir == exfat->root) + break; + /* fallthrough */ + default: + if (IS_EXFAT_DELETED(dentry->type)) + break; + if (repair_file_ask(de_iter, NULL, ER_DE_UNKNOWN, + "unknown entry type %#x at %07" PRIx64, + dentry->type, + exfat_de_iter_file_offset(de_iter))) { + struct exfat_dentry *dentry; + + exfat_de_iter_get_dirty(de_iter, 0, &dentry); + dentry->type &= EXFAT_DELETE; + } + break; + } + + exfat_de_iter_advance(de_iter, dentry_count); + } +out: + exfat_de_iter_flush(de_iter); + return 0; +err: + exfat_free_children(dir, false); + INIT_LIST_HEAD(&dir->children); + exfat_de_iter_flush(de_iter); + return ret; +} + +/* write bitmap segments for clusters which are marked + * as free, but allocated to files. + */ +static int write_bitmap(struct exfat_fsck *fsck) +{ + struct exfat *exfat = fsck->exfat; + bitmap_t *disk_b, *alloc_b, *ohead_b; + off_t dev_offset; + unsigned int i, bitmap_bytes, byte_offset, write_bytes; + + dev_offset = exfat_c2o(exfat, exfat->disk_bitmap_clus); + bitmap_bytes = EXFAT_BITMAP_SIZE(le32_to_cpu(exfat->bs->bsx.clu_count)); + + disk_b = (bitmap_t *)exfat->disk_bitmap; + alloc_b = (bitmap_t *)exfat->alloc_bitmap; + ohead_b = (bitmap_t *)exfat->ohead_bitmap; + + for (i = 0; i < bitmap_bytes / sizeof(bitmap_t); i++) + ohead_b[i] = alloc_b[i] | disk_b[i]; + + i = 0; + while (i < bitmap_bytes / sizeof(bitmap_t)) { + if (ohead_b[i] == disk_b[i]) { + i++; + continue; + } + + byte_offset = ((i * sizeof(bitmap_t)) / 512) * 512; + write_bytes = MIN(512, bitmap_bytes - byte_offset); + + if (exfat_write(exfat->blk_dev->dev_fd, + (char *)ohead_b + byte_offset, write_bytes, + dev_offset + byte_offset) != (ssize_t)write_bytes) + return -EIO; + + i = (byte_offset + write_bytes) / sizeof(bitmap_t); + } + return 0; + +} + +/* + * for each directory in @dir_list. + * 1. read all dentries and allocate exfat_nodes for files and directories. + * and append directory exfat_nodes to the head of @dir_list + * 2. free all of file exfat_nodes. + * 3. if the directory does not have children, free its exfat_node. + */ +static int exfat_filesystem_check(struct exfat_fsck *fsck) +{ + struct exfat *exfat = fsck->exfat; + struct exfat_inode *dir; + int ret = 0, dir_errors; + + if (!exfat->root) { + exfat_err("root is NULL\n"); + return -ENOENT; + } + + list_add(&exfat->root->list, &exfat->dir_list); + + while (!list_empty(&exfat->dir_list)) { + dir = list_entry(exfat->dir_list.next, + struct exfat_inode, list); + + if (!(dir->attr & ATTR_SUBDIR)) { + fsck_err(dir->parent, dir, + "failed to travel directories. " + "the node is not directory\n"); + ret = -EINVAL; + goto out; + } + + dir_errors = read_children(fsck, dir); + if (dir_errors) { + exfat_resolve_path(&path_resolve_ctx, dir); + exfat_debug("failed to check dentries: %s\n", + path_resolve_ctx.local_path); + ret = dir_errors; + } + + list_del(&dir->list); + exfat_free_file_children(dir); + exfat_free_ancestors(dir); + } +out: + exfat_free_dir_list(exfat); + return ret; +} + +static int exfat_root_dir_check(struct exfat *exfat) +{ + struct exfat_inode *root; + clus_t clus_count = 0; + int err; + + root = exfat_alloc_inode(ATTR_SUBDIR); + if (!root) + return -ENOMEM; + + exfat->root = root; + root->first_clus = le32_to_cpu(exfat->bs->bsx.root_cluster); + if (root_check_clus_chain(exfat, root, &clus_count)) { + exfat_err("failed to follow the cluster chain of root\n"); + exfat_free_inode(root); + exfat->root = NULL; + return -EINVAL; + } + root->size = clus_count * exfat->clus_size; + + exfat_stat.dir_count++; + exfat_debug("root directory: start cluster[0x%x] size[0x%" PRIx64 "]\n", + root->first_clus, root->size); + + err = exfat_read_volume_label(exfat); + if (err && err != EOF) + exfat_err("failed to read volume label\n"); + err = 0; + + err = read_bitmap(exfat); + if (err) { + exfat_err("failed to read bitmap\n"); + return -EINVAL; + } + + err = read_upcase_table(exfat); + if (err) { + exfat_err("failed to read upcase table\n"); + return -EINVAL; + } + + root->dev_offset = 0; + err = exfat_build_file_dentry_set(exfat, " ", ATTR_SUBDIR, + &root->dentry_set, &root->dentry_count); + if (err) { + exfat_free_inode(root); + return -ENOMEM; + } + return 0; +} + +static int read_lostfound(struct exfat *exfat, struct exfat_inode **lostfound) +{ + struct exfat_lookup_filter filter; + struct exfat_inode *inode; + int err; + + err = exfat_lookup_file(exfat, exfat->root, "LOST+FOUND", &filter); + if (err) + return err; + + inode = exfat_alloc_inode(ATTR_SUBDIR); + if (!inode) { + free(filter.out.dentry_set); + return -ENOMEM; + } + + inode->dentry_set = filter.out.dentry_set; + inode->dentry_count = filter.out.dentry_count; + inode->dev_offset = filter.out.dev_offset; + + inode->first_clus = + le32_to_cpu(filter.out.dentry_set[1].dentry.stream.start_clu); + inode->size = + le64_to_cpu(filter.out.dentry_set[1].dentry.stream.size); + + *lostfound = inode; + return 0; +} + +/* Create temporary files under LOST+FOUND and assign orphan + * chains of clusters to these files. + */ +static int rescue_orphan_clusters(struct exfat_fsck *fsck) +{ + struct exfat *exfat = fsck->exfat; + struct exfat_inode *lostfound; + bitmap_t *disk_b, *alloc_b, *ohead_b; + struct exfat_dentry *dset; + clus_t clu_count, clu, s_clu, e_clu; + int err, dcount; + unsigned int i; + char name[] = "FILE0000000.CHK"; + struct exfat_dentry_loc loc; + struct exfat_lookup_filter lf = { + .in.type = EXFAT_INVAL, + .in.filter = NULL, + }; + + err = read_lostfound(exfat, &lostfound); + if (err) { + exfat_err("failed to find LOST+FOUND\n"); + return err; + } + + /* get the last empty region of LOST+FOUND */ + err = exfat_lookup_dentry_set(exfat, lostfound, &lf); + if (err && err != EOF) { + exfat_err("failed to find the last empty slot in LOST+FOUND\n"); + goto out; + } + + loc.parent = lostfound; + loc.file_offset = lf.out.file_offset; + loc.dev_offset = lf.out.dev_offset; + + /* build a template dentry set */ + err = exfat_build_file_dentry_set(exfat, name, 0, &dset, &dcount); + if (err) { + exfat_err("failed to create a temporary file in LOST+FOUNDn"); + goto out; + } + dset[1].dentry.stream.flags |= EXFAT_SF_CONTIGUOUS; + + clu_count = le32_to_cpu(exfat->bs->bsx.clu_count); + + /* find clusters which are not marked as free, but not allocated to + * any files. + */ + disk_b = (bitmap_t *)exfat->disk_bitmap; + alloc_b = (bitmap_t *)exfat->alloc_bitmap; + ohead_b = (bitmap_t *)exfat->ohead_bitmap; + for (i = 0; i < EXFAT_BITMAP_SIZE(clu_count) / sizeof(bitmap_t); i++) + ohead_b[i] = disk_b[i] & ~alloc_b[i]; + + /* create temporary files and allocate contiguous orphan clusters + * to each file. + */ + for (clu = EXFAT_FIRST_CLUSTER; clu < clu_count + EXFAT_FIRST_CLUSTER && + exfat_bitmap_find_one(exfat, exfat->ohead_bitmap, clu, &s_clu) == 0;) { + if (exfat_bitmap_find_zero(exfat, exfat->ohead_bitmap, s_clu, &e_clu)) + e_clu = clu_count + EXFAT_FIRST_CLUSTER; + clu = e_clu; + + snprintf(name, sizeof(name), "FILE%07d.CHK", + (unsigned int)(loc.file_offset >> 5)); + err = exfat_update_file_dentry_set(exfat, dset, dcount, + name, s_clu, e_clu - s_clu); + if (err) + continue; + err = exfat_add_dentry_set(exfat, &loc, dset, dcount, true); + if (err) + continue; + } + + free(dset); + err = 0; +out: + exfat_free_inode(lostfound); + return err; +} + +static char *bytes_to_human_readable(size_t bytes) +{ + static const char * const units[] = {"B", "KB", "MB", "GB", "TB", "PB"}; + static char buf[15*4]; + unsigned int i, shift, quoti, remain; + i = sizeof(units) / sizeof(units[0]) - 1; + + while (i && (bytes >> i * 10) == 0) + i--; + + shift = i * 10; + quoti = (unsigned int)(bytes / (1ULL << shift)); + remain = 0; + if (shift > 0) { + remain = (unsigned int) + ((bytes & ((1ULL << shift) - 1)) >> (shift - 10)); + remain = (remain * 100) / 1024; + } + + snprintf(buf, sizeof(buf), "%u.%02u %s", quoti, remain, units[i]); + return buf; +} + +static void exfat_show_info(struct exfat_fsck *fsck, const char *dev_name) +{ + struct exfat *exfat = fsck->exfat; + bool clean; + + exfat_info("sector size: %s\n", + bytes_to_human_readable(1 << exfat->bs->bsx.sect_size_bits)); + exfat_info("cluster size: %s\n", + bytes_to_human_readable(exfat->clus_size)); + exfat_info("volume size: %s\n", + bytes_to_human_readable(exfat->blk_dev->size)); + + clean = exfat_stat.error_count == 0 || + exfat_stat.error_count == exfat_stat.fixed_count; + printf("%s: %s. directories %ld, files %ld\n", dev_name, + clean ? "clean" : "corrupted", + exfat_stat.dir_count, exfat_stat.file_count); + if (exfat_stat.error_count) + printf("%s: files corrupted %ld, files fixed %ld\n", dev_name, + exfat_stat.error_count - exfat_stat.fixed_count, + exfat_stat.fixed_count); +} + +int main(int argc, char * const argv[]) +{ + struct fsck_user_input ui; + struct exfat_blk_dev bd; + struct pbr *bs = NULL; + int c, ret, exit_code; + bool version_only = false; + + memset(&ui, 0, sizeof(ui)); + memset(&bd, 0, sizeof(bd)); + + print_level = EXFAT_ERROR; + + if (!setlocale(LC_CTYPE, "")) + exfat_err("failed to init locale/codeset\n"); + + opterr = 0; + while ((c = getopt_long(argc, argv, "arynpbsVvh", opts, NULL)) != EOF) { + switch (c) { + case 'n': + if (ui.options & FSCK_OPTS_REPAIR_ALL) + usage(argv[0]); + ui.options |= FSCK_OPTS_REPAIR_NO; + break; + case 'r': + if (ui.options & FSCK_OPTS_REPAIR_ALL) + usage(argv[0]); + ui.options |= FSCK_OPTS_REPAIR_ASK; + break; + case 'y': + if (ui.options & FSCK_OPTS_REPAIR_ALL) + usage(argv[0]); + ui.options |= FSCK_OPTS_REPAIR_YES; + break; + case 'a': + case 'p': + if (ui.options & FSCK_OPTS_REPAIR_ALL) + usage(argv[0]); + ui.options |= FSCK_OPTS_REPAIR_AUTO; + break; + case 'b': + ui.options |= FSCK_OPTS_IGNORE_BAD_FS_NAME; + break; + case 's': + ui.options |= FSCK_OPTS_RESCUE_CLUS; + break; + case 'V': + version_only = true; + break; + case 'v': + if (print_level < EXFAT_DEBUG) + print_level++; + break; + case '?': + case 'h': + default: + usage(argv[0]); + } + } + + show_version(); + if (optind != argc - 1) + usage(argv[0]); + + if (version_only) + exit(FSCK_EXIT_SYNTAX_ERROR); + if (ui.options & FSCK_OPTS_REPAIR_WRITE) + ui.ei.writeable = true; + else { + if (ui.options & (FSCK_OPTS_IGNORE_BAD_FS_NAME | + FSCK_OPTS_RESCUE_CLUS)) + usage(argv[0]); + ui.options |= FSCK_OPTS_REPAIR_NO; + ui.ei.writeable = false; + } + + exfat_fsck.options = ui.options; + + snprintf(ui.ei.dev_name, sizeof(ui.ei.dev_name), "%s", argv[optind]); + ret = exfat_get_blk_dev_info(&ui.ei, &bd); + if (ret < 0) { + exfat_err("failed to open %s. %d\n", ui.ei.dev_name, ret); + return FSCK_EXIT_OPERATION_ERROR; + } + + ret = exfat_boot_region_check(&bd, &bs, + ui.options & FSCK_OPTS_IGNORE_BAD_FS_NAME ? + true : false); + if (ret) + goto err; + + exfat_fsck.exfat = exfat_alloc_exfat(&bd, bs); + if (!exfat_fsck.exfat) { + ret = -ENOMEM; + goto err; + } + + exfat_fsck.buffer_desc = exfat_alloc_buffer(2, + exfat_fsck.exfat->clus_size, + exfat_fsck.exfat->sect_size); + if (!exfat_fsck.buffer_desc) { + ret = -ENOMEM; + goto err; + } + + if ((exfat_fsck.options & FSCK_OPTS_REPAIR_WRITE) && + exfat_mark_volume_dirty(exfat_fsck.exfat, true)) { + ret = -EIO; + goto err; + } + + exfat_debug("verifying root directory...\n"); + ret = exfat_root_dir_check(exfat_fsck.exfat); + if (ret) { + exfat_err("failed to verify root directory.\n"); + goto out; + } + + if (exfat_fsck.options & FSCK_OPTS_RESCUE_CLUS) { + ret = exfat_create_file(exfat_fsck.exfat, + exfat_fsck.exfat->root, + "LOST+FOUND", + ATTR_SUBDIR); + if (ret) { + exfat_err("failed to create lost+found directory\n"); + goto out; + } + + if (fsync(exfat_fsck.exfat->blk_dev->dev_fd) != 0) { + ret = -EIO; + exfat_err("failed to sync()\n"); + goto out; + } + } + + exfat_debug("verifying directory entries...\n"); + ret = exfat_filesystem_check(&exfat_fsck); + if (ret) + goto out; + + if (exfat_fsck.options & FSCK_OPTS_RESCUE_CLUS) { + rescue_orphan_clusters(&exfat_fsck); + exfat_fsck.dirty = true; + exfat_fsck.dirty_fat = true; + } + + if (exfat_fsck.options & FSCK_OPTS_REPAIR_WRITE) { + ret = write_bitmap(&exfat_fsck); + if (ret) { + exfat_err("failed to write bitmap\n"); + goto out; + } + } + + if (ui.ei.writeable && fsync(bd.dev_fd)) { + exfat_err("failed to sync\n"); + ret = -EIO; + goto out; + } + if (exfat_fsck.options & FSCK_OPTS_REPAIR_WRITE) + exfat_mark_volume_dirty(exfat_fsck.exfat, false); + +out: + exfat_show_info(&exfat_fsck, ui.ei.dev_name); +err: + if (ret && ret != -EINVAL) + exit_code = FSCK_EXIT_OPERATION_ERROR; + else if (ret == -EINVAL || + exfat_stat.error_count != exfat_stat.fixed_count) + exit_code = FSCK_EXIT_ERRORS_LEFT; + else if (exfat_fsck.dirty) + exit_code = FSCK_EXIT_CORRECTED; + else + exit_code = FSCK_EXIT_NO_ERRORS; + + if (exfat_fsck.buffer_desc) + exfat_free_buffer(exfat_fsck.buffer_desc, 2); + if (exfat_fsck.exfat) + exfat_free_exfat(exfat_fsck.exfat); + close(bd.dev_fd); + return exit_code; +} diff --git a/fsck/fsck.h b/fsck/fsck.h new file mode 100644 index 0000000..53003f6 --- /dev/null +++ b/fsck/fsck.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020 Hyunchul Lee <hyc.lee@gmail.com> + */ +#ifndef _FSCK_H +#define _FSCK_H + +#include "list.h" + +enum fsck_ui_options { + FSCK_OPTS_REPAIR_ASK = 0x01, + FSCK_OPTS_REPAIR_YES = 0x02, + FSCK_OPTS_REPAIR_NO = 0x04, + FSCK_OPTS_REPAIR_AUTO = 0x08, + FSCK_OPTS_REPAIR_WRITE = 0x0b, + FSCK_OPTS_REPAIR_ALL = 0x0f, + FSCK_OPTS_IGNORE_BAD_FS_NAME = 0x10, + FSCK_OPTS_RESCUE_CLUS = 0x20, +}; + +struct exfat; +struct exfat_inode; + +struct exfat_fsck { + struct exfat *exfat; + struct exfat_de_iter de_iter; + struct buffer_desc *buffer_desc; /* cluster * 2 */ + enum fsck_ui_options options; + bool dirty:1; + bool dirty_fat:1; +}; + +off_t exfat_c2o(struct exfat *exfat, unsigned int clus); + +#endif diff --git a/fsck/repair.c b/fsck/repair.c new file mode 100644 index 0000000..92b1c3f --- /dev/null +++ b/fsck/repair.c @@ -0,0 +1,159 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020 Hyunchul Lee <hyc.lee@gmail.com> + */ +#include <stdio.h> +#include <string.h> +#include <stdarg.h> +#include <stdlib.h> + +#include "exfat_ondisk.h" +#include "libexfat.h" +#include "repair.h" +#include "exfat_fs.h" +#include "exfat_dir.h" +#include "fsck.h" + +struct exfat_repair_problem { + er_problem_code_t prcode; + unsigned int flags; + unsigned int prompt_type; + unsigned int default_number; + unsigned int bypass_number; + unsigned int max_number; +}; + +/* Problem flags */ +#define ERF_PREEN_YES 0x00000001 +#define ERF_DEFAULT_YES 0x00000002 +#define ERF_DEFAULT_NO 0x00000004 + +/* Prompt types */ +#define ERP_FIX 0x00000001 +#define ERP_TRUNCATE 0x00000002 +#define ERP_DELETE 0x00000003 +#define ERP_RENAME 0x00000004 + +static const char *prompts[] = { + "Repair", + "Fix", + "Truncate", + "Delete", + "Select", +}; + +static struct exfat_repair_problem problems[] = { + {ER_BS_CHECKSUM, ERF_PREEN_YES, ERP_FIX, 0, 0, 0}, + {ER_BS_BOOT_REGION, 0, ERP_FIX, 0, 0, 0}, + {ER_DE_CHECKSUM, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0}, + {ER_DE_UNKNOWN, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0}, + {ER_DE_FILE, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0}, + {ER_DE_SECONDARY_COUNT, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0}, + {ER_DE_STREAM, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0}, + {ER_DE_NAME, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0}, + {ER_DE_NAME_HASH, ERF_PREEN_YES, ERP_FIX, 0, 0, 0}, + {ER_DE_NAME_LEN, ERF_PREEN_YES, ERP_FIX, 0, 0, 0}, + {ER_DE_DOT_NAME, ERF_PREEN_YES, ERP_RENAME, 2, 3, 4}, + {ER_FILE_VALID_SIZE, ERF_PREEN_YES, ERP_FIX, 0, 0, 0}, + {ER_FILE_INVALID_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0}, + {ER_FILE_FIRST_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0}, + {ER_FILE_SMALLER_SIZE, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0}, + {ER_FILE_LARGER_SIZE, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0}, + {ER_FILE_DUPLICATED_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0}, + {ER_FILE_ZERO_NOFAT, ERF_PREEN_YES, ERP_FIX, 0, 0, 0}, +}; + +static struct exfat_repair_problem *find_problem(er_problem_code_t prcode) +{ + unsigned int i; + + for (i = 0; i < sizeof(problems)/sizeof(problems[0]); i++) { + if (problems[i].prcode == prcode) { + return &problems[i]; + } + } + return NULL; +} + +static int ask_repair(struct exfat_fsck *fsck, struct exfat_repair_problem *pr) +{ + int repair = 0; + char answer[8]; + + if (fsck->options & FSCK_OPTS_REPAIR_NO || + pr->flags & ERF_DEFAULT_NO) + repair = 0; + else if (fsck->options & FSCK_OPTS_REPAIR_YES || + pr->flags & ERF_DEFAULT_YES) + repair = 1; + else { + if (fsck->options & FSCK_OPTS_REPAIR_ASK) { + do { + if (pr->prompt_type & ERP_RENAME) { + printf("%s (Number: ?) ", + prompts[pr->prompt_type]); + } else { + printf(". %s (y/N)? ", + prompts[pr->prompt_type]); + } + fflush(stdout); + + if (!fgets(answer, sizeof(answer), stdin)) + continue; + + if (pr->prompt_type & ERP_RENAME) { + unsigned int number = atoi(answer); + + if (number > 0 && number < pr->max_number) + return number; + } else { + if (strcasecmp(answer, "Y\n") == 0) + return 1; + else if (strcasecmp(answer, "\n") == 0 || + strcasecmp(answer, "N\n") == 0) + return 0; + } + } while (1); + } else if (fsck->options & FSCK_OPTS_REPAIR_AUTO && + pr->flags & ERF_PREEN_YES) + repair = 1; + } + + if (pr->prompt_type & ERP_RENAME) { + int print_num = repair ? pr->default_number : pr->bypass_number; + + printf("%s (Number : %d)\n", prompts[pr->prompt_type], + print_num); + repair = print_num; + } else { + printf(". %s (y/N)? %c\n", prompts[pr->prompt_type], + repair ? 'y' : 'n'); + } + return repair; +} + +int exfat_repair_ask(struct exfat_fsck *fsck, er_problem_code_t prcode, + const char *desc, ...) +{ + struct exfat_repair_problem *pr = NULL; + va_list ap; + int repair; + + pr = find_problem(prcode); + if (!pr) { + exfat_err("unknown problem code. %#x\n", prcode); + return 0; + } + + va_start(ap, desc); + vprintf(desc, ap); + va_end(ap); + + repair = ask_repair(fsck, pr); + if (repair) { + if (pr->prompt_type & ERP_TRUNCATE) + fsck->dirty_fat = true; + fsck->dirty = true; + } + return repair; +} diff --git a/fsck/repair.h b/fsck/repair.h new file mode 100644 index 0000000..dc3cc50 --- /dev/null +++ b/fsck/repair.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020 Hyunchul Lee <hyc.lee@gmail.com> + */ +#ifndef _REPAIR_H +#define _REPAIR_H + +#define ER_BS_CHECKSUM 0x00000001 +#define ER_BS_BOOT_REGION 0x00000002 +#define ER_DE_CHECKSUM 0x00001001 +#define ER_DE_UNKNOWN 0x00001002 +#define ER_DE_FILE 0x00001010 +#define ER_DE_SECONDARY_COUNT 0x00001011 +#define ER_DE_STREAM 0x00001020 +#define ER_DE_NAME 0x00001030 +#define ER_DE_NAME_HASH 0x00001031 +#define ER_DE_NAME_LEN 0x00001032 +#define ER_DE_DOT_NAME 0x00001033 +#define ER_FILE_VALID_SIZE 0x00002001 +#define ER_FILE_INVALID_CLUS 0x00002002 +#define ER_FILE_FIRST_CLUS 0x00002003 +#define ER_FILE_SMALLER_SIZE 0x00002004 +#define ER_FILE_LARGER_SIZE 0x00002005 +#define ER_FILE_DUPLICATED_CLUS 0x00002006 +#define ER_FILE_ZERO_NOFAT 0x00002007 + +typedef unsigned int er_problem_code_t; +struct exfat_fsck; + +int exfat_repair_ask(struct exfat_fsck *fsck, er_problem_code_t prcode, + const char *fmt, ...); + +#endif |