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Add fatfs(8).

This commit is contained in:
Jonas 'Sortie' Termansen 2023-10-11 01:19:48 +02:00
parent 96a8bae02d
commit 6ba8da83c3
27 changed files with 4606 additions and 6 deletions
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1
Makefile
View File

@ -20,6 +20,7 @@ display \
dnsconfig \
editor \
ext \
fat \
games \
hostname \
ifconfig \

83
disked/disked.c
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@ -49,6 +49,7 @@
#include <mount/blockdevice.h>
#include <mount/devices.h>
#include <mount/ext2.h>
#include <mount/fat.h>
#include <mount/filesystem.h>
#include <mount/gpt.h>
#include <mount/harddisk.h>
@ -1771,9 +1772,9 @@ static void on_mkpart(size_t argc, char** argv)
bool is_gpt = current_pt_type == PARTITION_TABLE_TYPE_GPT;
const char* question = "Format a filesystem? (no/ext2)";
if ( is_mbr )
question = "Format a filesystem? (no/ext2/extended)";
question = "Format a filesystem? (no/ext2/extended/fat)";
else if ( is_gpt )
question = "Format a filesystem? (no/ext2/biosboot)";
question = "Format a filesystem? (no/ext2/biosboot/efi/fat)";
if ( 5 <= argc )
strlcpy(fstype, argv[4], sizeof(fstype));
else
@ -1781,7 +1782,9 @@ static void on_mkpart(size_t argc, char** argv)
if ( strcmp(fstype, "no") != 0 &&
strcmp(fstype, "ext2") != 0 &&
(!is_mbr || strcmp(fstype, "extended") != 0) &&
(!is_gpt || strcmp(fstype, "biosboot") != 0) )
(!is_gpt || strcmp(fstype, "biosboot") != 0) &&
(!is_gpt || strcmp(fstype, "efi") != 0) &&
strcmp(fstype, "fat") != 0 )
{
command_errorx("%s: %s: Invalid filesystem choice: %s",
argv[0], device_name(current_hd->path), fstype);
@ -1801,14 +1804,18 @@ static void on_mkpart(size_t argc, char** argv)
break;
}
char mountpoint[256] = "";
bool mountable = !strcmp(fstype, "ext2");
// TODO: Get this information from libmount.
bool mountable = !strcmp(fstype, "ext2") ||
!strcmp(fstype, "fat") ||
!strcmp(fstype, "efi");
while ( mountable )
{
const char* def = !strcmp(fstype, "efi") ? "/boot/efi" : "no";
if ( 6 <= argc )
strlcpy(mountpoint, argv[5], sizeof(mountpoint));
else
prompt(mountpoint, sizeof(mountpoint),
"Where to mount partition? (mountpoint or 'no')", "no");
"Where to mount partition? (mountpoint or 'no')", def);
if ( !strcmp(mountpoint, "no") )
{
mountpoint[0] = '\0';
@ -2003,6 +2010,10 @@ static void on_mkpart(size_t argc, char** argv)
const char* type_uuid_str = "0FC63DAF-8483-4772-8E79-3D69D8477DE4";
if ( !strcmp(fstype, "biosboot") )
type_uuid_str = BIOSBOOT_GPT_TYPE_UUID;
else if ( !strcmp(fstype, "efi") )
type_uuid_str = ESP_GPT_TYPE_UUID;
else if ( !strcmp(fstype, "fat") )
type_uuid_str = BDP_GPT_TYPE_UUID;
uuid_from_string(p.partition_type_guid, type_uuid_str);
arc4random_buf(p.unique_partition_guid, sizeof(p.unique_partition_guid));
off_t pstart = hole->start + start;
@ -2162,6 +2173,68 @@ static void on_mkpart(size_t argc, char** argv)
}
}
}
if ( !strcmp(fstype, "efi") || !strcmp(fstype, "fat") )
{
printf("(Formatting %s as %s...)\n", device_name(p->path), fstype);
// TODO: Zero superblock?
// TODO: Run this in its own foreground process group so ^C works.
pid_t child_pid = fork();
if ( child_pid < 0 )
{
command_error("%s: fork", argv[0]);
return;
}
const char* mkfs_argv[] =
{
"mkfs.fat",
"-F", // TODO: Force FAT32 until FAT12/16 root dir writing is added.
"32",
p->path,
NULL
};
if ( child_pid == 0 )
{
execvp(mkfs_argv[0], (char* const*) mkfs_argv);
warn("%s", mkfs_argv[0]);
_exit(127);
}
int status;
waitpid(child_pid, &status, 0);
if ( WIFEXITED(status) && WEXITSTATUS(status) == 127 )
{
command_errorx("%s: Failed to format filesystem (%s is not installed)",
argv[0], mkfs_argv[0]);
return;
}
else if ( WIFEXITED(status) && WEXITSTATUS(status) != 0 )
{
command_errorx("%s: Failed to format filesystem", argv[0]);
return;
}
else if ( WIFSIGNALED(status) )
{
command_errorx("%s: Failed to format filesystem (%s)",
argv[0], strsignal(WTERMSIG(status)));
return;
}
printf("(Formatted %s as %s)\n", device_name(p->path), fstype);
scan_partition(p);
if ( !p->bdev.fs /* TODO: || !(p->bdev.fs->flags & FILESYSTEM_FLAG_UUID) */ )
{
command_errorx("%s: %s: Failed to scan expected %s filesystem",
argv[0], device_name(p->path), fstype);
return;
}
if ( mountpoint[0] )
{
if ( !add_blockdevice_to_fstab(&p->bdev, mountpoint) )
{
command_error("%s: %s: Failed to add partition", argv[0], fstab_path);
return;
}
}
}
}
static void on_mktable(size_t argc, char** argv)

2
fat/.gitignore vendored Normal file
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@ -0,0 +1,2 @@
fatfs
*.o

34
fat/Makefile Normal file
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@ -0,0 +1,34 @@
include ../build-aux/platform.mak
include ../build-aux/compiler.mak
include ../build-aux/version.mak
include ../build-aux/dirs.mak
OPTLEVEL?=$(DEFAULT_OPTLEVEL)
CXXFLAGS?=$(OPTLEVEL)
CPPFLAGS:=$(CPPFLAGS) -DVERSIONSTR=\"$(VERSION)\"
CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra -fno-exceptions -fno-rtti -fcheck-new
LIBS:=$(LIBS)
ifeq ($(HOST_IS_SORTIX),0)
PTHREAD_OPTION:=-pthread
LIBS:=$(LIBS) -lfuse
CPPFLAGS:=$(CPPFLAGS) -D_FILE_OFFSET_BITS=64
endif
BINARIES:=fatfs
all: $(BINARIES)
.PHONY: all install clean
install: all
mkdir -p $(DESTDIR)$(SBINDIR)
install $(BINARIES) $(DESTDIR)$(SBINDIR)
fatfs: *.cpp *.h
$(CXX) $(PTHREAD_OPTION) -std=gnu++11 $(CPPFLAGS) $(CXXFLAGS) *.cpp -o $@ $(LIBS)
clean:
rm -f $(BINARIES) *.o

165
fat/block.cpp Normal file
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@ -0,0 +1,165 @@
/*
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* block.cpp
* Blocks in the filesystem.
*/
#include <sys/types.h>
#include <assert.h>
#include <pthread.h>
#include <stddef.h>
#include <stdint.h>
#include "block.h"
#include "device.h"
#include "ioleast.h"
Block::Block()
{
this->block_data = NULL;
}
Block::Block(Device* device, uint32_t block_id)
{
Construct(device, block_id);
}
void Block::Construct(Device* device, uint32_t block_id)
{
this->modify_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
this->transit_done_cond = PTHREAD_COND_INITIALIZER;
this->prev_block = NULL;
this->next_block = NULL;
this->prev_hashed = NULL;
this->next_hashed = NULL;
this->prev_dirty = NULL;
this->next_dirty = NULL;
this->device = device;
this->reference_count = 1;
this->block_id = block_id;
this->dirty = false;
this->is_in_transit = false;
}
Block::~Block()
{
Destruct();
delete[] block_data;
}
void Block::Destruct()
{
Sync();
Unlink();
}
void Block::Refer()
{
reference_count++;
}
void Block::Unref()
{
if ( !--reference_count )
{
#if 0
device->block_count--;
delete this;
#endif
}
}
void Block::Sync()
{
if ( device->has_sync_thread )
{
pthread_mutex_lock(&device->sync_thread_lock);
while ( dirty || is_in_transit )
pthread_cond_wait(&transit_done_cond, &device->sync_thread_lock);
pthread_mutex_unlock(&device->sync_thread_lock);
return;
}
if ( !dirty )
return;
dirty = false;
(prev_dirty ? prev_dirty->next_dirty : device->dirty_block) = next_dirty;
if ( next_dirty )
next_dirty->prev_dirty = prev_dirty;
prev_dirty = NULL;
next_dirty = NULL;
if ( !device->write )
return;
off_t file_offset = (off_t) device->block_size * (off_t) block_id;
pwriteall(device->fd, block_data, device->block_size, file_offset);
}
void Block::BeginWrite()
{
assert(device->write);
pthread_mutex_lock(&modify_lock);
}
void Block::FinishWrite()
{
pthread_mutex_unlock(&modify_lock);
pthread_mutex_lock(&device->sync_thread_lock);
if ( !dirty )
{
dirty = true;
prev_dirty = NULL;
next_dirty = device->dirty_block;
if ( next_dirty )
next_dirty->prev_dirty = this;
device->dirty_block = this;
pthread_cond_signal(&device->sync_thread_cond);
}
pthread_mutex_unlock(&device->sync_thread_lock);
Use();
}
void Block::Use()
{
Unlink();
Prelink();
}
void Block::Unlink()
{
(prev_block ? prev_block->next_block : device->mru_block) = next_block;
(next_block ? next_block->prev_block : device->lru_block) = prev_block;
size_t bin = block_id % DEVICE_HASH_LENGTH;
(prev_hashed ? prev_hashed->next_hashed : device->hash_blocks[bin]) = next_hashed;
if ( next_hashed ) next_hashed->prev_hashed = prev_hashed;
}
void Block::Prelink()
{
prev_block = NULL;
next_block = device->mru_block;
if ( device->mru_block )
device->mru_block->prev_block = this;
device->mru_block = this;
if ( !device->lru_block )
device->lru_block = this;
size_t bin = block_id % DEVICE_HASH_LENGTH;
prev_hashed = NULL;
next_hashed = device->hash_blocks[bin];
device->hash_blocks[bin] = this;
if ( next_hashed )
next_hashed->prev_hashed = this;
}

62
fat/block.h Normal file
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@ -0,0 +1,62 @@
/*
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* block.h
* Blocks in the filesystem.
*/
#ifndef BLOCK_H
#define BLOCK_H
class Device;
class Block
{
public:
Block();
Block(Device* device, uint32_t block_id);
~Block();
void Construct(Device* device, uint32_t block_id);
void Destruct();
public:
pthread_mutex_t modify_lock;
pthread_cond_t transit_done_cond;
Block* prev_block;
Block* next_block;
Block* prev_hashed;
Block* next_hashed;
Block* prev_dirty;
Block* next_dirty;
Device* device;
size_t reference_count;
uint32_t block_id;
bool dirty;
bool is_in_transit;
uint8_t* block_data;
public:
void Refer();
void Unref();
void Sync();
void BeginWrite();
void FinishWrite();
void Use();
void Unlink();
void Prelink();
};
#endif

220
fat/device.cpp Normal file
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@ -0,0 +1,220 @@
/*
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* device.cpp
* Block device.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <pthread.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include "block.h"
#include "device.h"
#include "ioleast.h"
void* Device__SyncThread(void* ctx)
{
((Device*) ctx)->SyncThread();
return NULL;
}
Device::Device(int fd, const char* path, uint32_t block_size, bool write)
{
// sync_thread unset.
this->sync_thread_cond = PTHREAD_COND_INITIALIZER;
this->sync_thread_idle_cond = PTHREAD_COND_INITIALIZER;
this->sync_thread_lock = PTHREAD_MUTEX_INITIALIZER;
this->mru_block = NULL;
this->lru_block = NULL;
this->dirty_block = NULL;
for ( size_t i = 0; i < DEVICE_HASH_LENGTH; i++ )
hash_blocks[i] = NULL;
struct stat st;
fstat(fd, &st);
this->device_size = st.st_size;
this->path = path;
this->block_size = block_size;
this->fd = fd;
this->write = write;
this->has_sync_thread = false;
this->sync_thread_should_exit = false;
this->sync_in_transit = false;
this->block_count = 0;
#ifdef __sortix__
// TODO: This isn't scaleable if there's multiple filesystems mounted.
size_t memory;
memstat(NULL, &memory);
this->block_limit = (memory / 10) / block_size;
#else
this->block_limit = 32768;
#endif
}
Device::~Device()
{
if ( has_sync_thread )
{
pthread_mutex_lock(&sync_thread_lock);
sync_thread_should_exit = true;
pthread_cond_signal(&sync_thread_cond);
pthread_mutex_unlock(&sync_thread_lock);
pthread_join(sync_thread, NULL);
has_sync_thread = false;
}
Sync();
while ( mru_block )
delete mru_block;
close(fd);
}
void Device::SpawnSyncThread()
{
if ( this->has_sync_thread )
return;
this->has_sync_thread = write &&
pthread_create(&this->sync_thread, NULL, Device__SyncThread, this) == 0;
}
Block* Device::AllocateBlock()
{
if ( block_limit <= block_count )
{
for ( Block* block = lru_block; block; block = block->prev_block )
{
if ( block->reference_count )
continue;
block->Destruct(); // Syncs.
return block;
}
}
uint8_t* data = new uint8_t[block_size];
if ( !data ) // TODO: Use operator new nothrow!
return NULL;
Block* block = new Block();
if ( !block ) // TODO: Use operator new nothrow!
return delete[] data, (Block*) NULL;
block->block_data = data;
block_count++;
return block;
}
Block* Device::GetBlock(uint32_t block_id)
{
if ( Block* block = GetCachedBlock(block_id) )
return block;
Block* block = AllocateBlock();
if ( !block )
return NULL;
block->Construct(this, block_id);
off_t file_offset = (off_t) block_size * (off_t) block_id;
preadall(fd, block->block_data, block_size, file_offset);
block->Prelink();
return block;
}
Block* Device::GetBlockZeroed(uint32_t block_id)
{
assert(write);
if ( Block* block = GetCachedBlock(block_id) )
{
block->BeginWrite();
memset(block->block_data, 0, block_size);
block->FinishWrite();
return block;
}
Block* block = AllocateBlock();
if ( !block )
return NULL;
block->Construct(this, block_id);
memset(block->block_data, 0, block_size);
block->Prelink();
block->BeginWrite();
block->FinishWrite();
return block;
}
Block* Device::GetCachedBlock(uint32_t block_id)
{
size_t bin = block_id % DEVICE_HASH_LENGTH;
for ( Block* iter = hash_blocks[bin]; iter; iter = iter->next_hashed )
if ( iter->block_id == block_id )
return iter->Refer(), iter;
return NULL;
}
void Device::Sync()
{
if ( has_sync_thread )
{
pthread_mutex_lock(&sync_thread_lock);
while ( dirty_block || sync_in_transit )
pthread_cond_wait(&sync_thread_cond, &sync_thread_lock);
pthread_mutex_unlock(&sync_thread_lock);
fsync(fd);
return;
}
while ( dirty_block )
dirty_block->Sync();
fsync(fd);
}
void Device::SyncThread()
{
uint8_t transit_block_data[block_size];
pthread_mutex_lock(&sync_thread_lock);
while ( true )
{
while ( !(dirty_block || sync_thread_should_exit) )
pthread_cond_wait(&sync_thread_cond, &sync_thread_lock);
if ( sync_thread_should_exit )
break;
Block* block = dirty_block;
if ( block->next_dirty )
block->next_dirty->prev_dirty = NULL;
dirty_block = block->next_dirty;
block->next_dirty = NULL;
block->dirty = false;
block->is_in_transit = true;
sync_in_transit = true;
pthread_mutex_unlock(&sync_thread_lock);
pthread_mutex_lock(&block->modify_lock);
memcpy(transit_block_data, block->block_data, block_size);
pthread_mutex_unlock(&block->modify_lock);
off_t offset = (off_t) block_size * (off_t) block->block_id;
pwriteall(fd, transit_block_data, block_size, offset);
pthread_mutex_lock(&sync_thread_lock);
block->is_in_transit = false;
sync_in_transit = false;
pthread_cond_signal(&block->transit_done_cond);
if ( !dirty_block )
pthread_cond_signal(&sync_thread_idle_cond);
}
pthread_mutex_unlock(&sync_thread_lock);
}

64
fat/device.h Normal file
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@ -0,0 +1,64 @@
/*
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* device.h
* Block device.
*/
#ifndef DEVICE_H
#define DEVICE_H
class Block;
static const size_t DEVICE_HASH_LENGTH = 1 << 16;
class Device
{
public:
Device(int fd, const char* path, uint32_t block_size, bool write);
~Device();
public:
pthread_t sync_thread;
pthread_cond_t sync_thread_cond;
pthread_cond_t sync_thread_idle_cond;
pthread_mutex_t sync_thread_lock;
Block* mru_block;
Block* lru_block;
Block* dirty_block;
Block* hash_blocks[DEVICE_HASH_LENGTH];
off_t device_size;
const char* path;
uint32_t block_size;
int fd;
bool write;
bool has_sync_thread;
bool sync_thread_should_exit;
bool sync_in_transit;
size_t block_count;
size_t block_limit;
public:
void SpawnSyncThread();
Block* AllocateBlock();
Block* GetBlock(uint32_t block_id);
Block* GetBlockZeroed(uint32_t block_id);
Block* GetCachedBlock(uint32_t block_id);
void Sync();
void SyncThread();
};
#endif

124
fat/fat.h Normal file
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@ -0,0 +1,124 @@
/*
* Copyright (c) 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fat.h
* The File Allocation Table (FAT) filesystem.
*/
#ifndef FAT_H
#define FAT_H
#include <assert.h>
#include <stdint.h>
// TODO: Dammit. I forgot to swap endian all across the codebase.
struct fat_bpb
{
uint8_t jump[3];
char oem[8];
uint8_t bytes_per_sector_low;
uint8_t bytes_per_sector_high;
uint8_t sectors_per_cluster;
uint16_t reserved_sectors;
uint8_t fat_count;
uint8_t root_dirent_count_low;
uint8_t root_dirent_count_high;
uint8_t total_sectors_low;
uint8_t total_sectors_high;
uint8_t media_descriptor_type;
uint16_t sectors_per_fat;
uint16_t sectors_per_track;
uint16_t head_count;
uint16_t hidden_sectors;
uint32_t total_sectors_large;
union
{
struct
{
uint8_t fat12_drive_number;
uint8_t fat12_reserved;
uint8_t fat12_signature;
uint8_t fat12_volume_id[4];
uint8_t fat12_volume_label[11];
uint8_t fat12_system[8];
};
struct
{
uint32_t fat32_sectors_per_fat;
uint16_t fat32_flags;
uint16_t fat32_version;
uint32_t fat32_root_cluster;
uint16_t fat32_fsinfo;
uint16_t fat32_backup_boot;
uint32_t fat32_reserved1[3];
uint8_t fat32_drive_number;
uint8_t fat32_reserved2;
uint8_t fat32_signature;
uint8_t fat32_volume_id[4];
uint8_t fat32_volume_label[11];
uint8_t fat32_system[8];
};
struct
{
uint8_t bootloader[510 - 36];
uint8_t boot_signature[2];
};
};
};
static_assert(sizeof(struct fat_bpb) == 512, "sizeof(struct fat_bpb) == 512");
struct fat_fsinfo
{
uint32_t signature1;
uint32_t reserved1[120];
uint32_t signature2;
uint32_t free_count;
uint32_t next_free;
uint32_t reserved2[3];
uint32_t signature3;
};
static_assert(sizeof(struct fat_fsinfo) == 512, "sizeof(struct fat_fsinfo) == 512");
struct fat_dirent
{
char name[11];
uint8_t attributes;
uint8_t reserved;
uint8_t creation_tenths; // TODO: Misnamed semantically.
uint16_t creation_time;
uint16_t creation_date;
uint16_t access_date;
uint16_t cluster_high;
uint16_t modified_time;
uint16_t modified_date;
uint16_t cluster_low;
uint32_t size;
};
static_assert(sizeof(struct fat_dirent) == 32, "sizeof(struct fat_dirent) == 32");
#define FAT_ATTRIBUTE_READ_ONLY (1 << 0)
#define FAT_ATTRIBUTE_HIDDEN (1 << 1)
#define FAT_ATTRIBUTE_SYSTEM (1 << 2)
#define FAT_ATTRIBUTE_VOLUME_ID (1 << 3)
#define FAT_ATTRIBUTE_DIRECTORY (1 << 4)
#define FAT_ATTRIBUTE_ARCHIVE (1 << 5)
#define FAT_ATTRIBUTE_LONG_NAME 0x0F
#endif

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/*
* Copyright (c) 2013, 2014, 2015, 2016, 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fatfs.cpp
* The File Allocation Table (FAT) filesystem.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#if defined(__sortix__)
#include "fsmarshall.h"
#else
#include "fuse.h"
#endif
#include "block.h"
#include "device.h"
#include "fat.h"
#include "fatfs.h"
#include "filesystem.h"
#include "inode.h"
#include "ioleast.h"
#include "util.h"
uid_t request_uid;
uid_t request_gid;
// TODO: Encapsulate.
void StatInode(Inode* inode, struct stat* st)
{
memset(st, 0, sizeof(*st));
st->st_ino = inode->inode_id;
st->st_mode = inode->Mode();
st->st_nlink = 1; // TODO: Encapsulate.
st->st_uid = inode->UserId();
st->st_gid = inode->GroupId();
st->st_size = inode->Size();
// TODO: Encapsulate.
// TODO: For the root dir, mount time, or maybe volume label or first file?
// Or maybe the time of the mount point?
time_t mtime = 0;
if ( inode->dirent )
{
struct tm tm;
memset(&tm, 0, sizeof(tm));
tm.tm_sec = ((inode->dirent->modified_time >> 0) & 0x1F) * 2;
tm.tm_min = (inode->dirent->modified_time >> 5) & 0x3F;
tm.tm_hour = (inode->dirent->modified_time >> 11) & 0x1F;
tm.tm_mday = (inode->dirent->modified_date >> 0) & 0x1F;
tm.tm_mon = ((inode->dirent->modified_date >> 5) & 0xF) - 1;
tm.tm_year = ((inode->dirent->modified_date >> 9) & 0x7F) + 80;
mtime = mktime(&tm);
}
st->st_atim.tv_sec = mtime; // TODO: The actual accessed time;
st->st_atim.tv_nsec = 0;
st->st_ctim.tv_sec = mtime; // TODO: Probably fine to keep as modified time.
st->st_ctim.tv_nsec = 0;
st->st_mtim.tv_sec = mtime;
st->st_mtim.tv_nsec = 0;
st->st_blksize = inode->filesystem->bytes_per_sector *
inode->filesystem->bpb->sectors_per_cluster;
// TODO: Encapsulate.
st->st_blocks = 0; // TODO inode->data->i_blocks;
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]... DEVICE [MOUNT-POINT]\n", argv0);
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
}
int main(int argc, char* argv[])
{
const char* argv0 = argv[0];
const char* pretend_mount_path = NULL;
bool foreground = false;
bool read = false;
bool write = false;
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
case 'r': read = true; break;
case 'w': write = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--background") )
foreground = false;
else if ( !strcmp(arg, "--foreground") )
foreground = true;
else if ( !strcmp(arg, "--read") )
read = true;
else if ( !strcmp(arg, "--write") )
write = true;
else if ( !strncmp(arg, "--pretend-mount-path=", strlen("--pretend-mount-path=")) )
pretend_mount_path = arg + strlen("--pretend-mount-path=");
else if ( !strcmp(arg, "--pretend-mount-path") )
{
if ( i+1 == argc )
{
fprintf(stderr, "%s: --pretend-mount-path: Missing operand\n", argv0);
exit(1);
}
pretend_mount_path = argv[++i];
argv[i] = NULL;
}
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
// It doesn't make sense to have a write-only filesystem.
read = read || write;
// Default to read and write filesystem access.
if ( !read && !write )
read = write = true;
if ( argc == 1 )
{
help(stdout, argv0);
exit(0);
}
compact_arguments(&argc, &argv);
const char* device_path = 2 <= argc ? argv[1] : NULL;
const char* mount_path = 3 <= argc ? argv[2] : NULL;
if ( !device_path )
{
help(stderr, argv0);
exit(1);
}
if ( !pretend_mount_path )
pretend_mount_path = mount_path;
int fd = open(device_path, write ? O_RDWR : O_RDONLY);
if ( fd < 0 )
err(1, "%s", device_path);
// Read the bios parameter block from the filesystem so we can verify it.
struct fat_bpb bpb;
if ( preadall(fd, &bpb, sizeof(bpb), 0) != sizeof(bpb) )
{
if ( errno == EEOF )
errx(1, "%s: Isn't a valid FAT filesystem (too short)", device_path);
else
err(1, "read: %s", device_path);
}
// Verify the boot.
if ( !(bpb.boot_signature[0] == 0x55 && bpb.boot_signature[1] == 0xAA) )
errx(1, "%s: Isn't a valid FAT filesystem (no boot signature)", device_path);
// Verify the jump instruction at the start of the boot sector.
if ( !(bpb.jump[0] == 0xEB && bpb.jump[2] == 0x90) &&
!(bpb.jump[0] == 0xE9) )
errx(1, "%s: Isn't a valid FAT filesystem (bad jump)", device_path);
// TODO: Validate all parameters make sense.
uint16_t bytes_per_sector =
bpb.bytes_per_sector_low | bpb.bytes_per_sector_high << 8;
uint16_t root_dirent_count =
bpb.root_dirent_count_low | bpb.root_dirent_count_high << 8;
uint32_t root_dir_sectors =
divup<uint32_t>(root_dirent_count * sizeof(fat_dirent), bytes_per_sector);
uint32_t sectors_per_fat =
bpb.sectors_per_fat ? bpb.sectors_per_fat : bpb.fat32_sectors_per_fat;
uint32_t total_sectors =
bpb.total_sectors_low | bpb.total_sectors_high << 8;
if ( !total_sectors )
total_sectors = bpb.total_sectors_large;
uint32_t data_offset =
bpb.reserved_sectors + bpb.fat_count * sectors_per_fat + root_dir_sectors;
uint32_t data_sectors = total_sectors - data_offset;
uint32_t cluster_count = data_sectors / bpb.sectors_per_cluster;
uint8_t fat_type =
cluster_count < 4085 ? 12 : cluster_count < 65525 ? 16 : 32;
// Verify the filesystem version.
if ( fat_type == 32 && bpb.fat32_version != 0x0000 )
errx(1, "%s: Unsupported filesystem version 0x%04x", device_path,
bpb.fat32_version);
// TODO: On FAT16/32 check FAT entry 1 for the high bits to see if fsck is needed.
// Check whether the filesystem was unmounted cleanly.
//if ( !(fat[1] & FAT_UNMOUNTED) || !(fat[1] & FAT_NO_IO_ERR) )
// warn("warning: %s: Filesystem wasn't unmounted cleanly\n", device_path);
// TODO: The FAT and clusters are not aligned to cluster size so
// we can't use the cluster size here. Perhaps refactor the
// device so we can deal with whole clusters.
Device* dev = new Device(fd, device_path, bytes_per_sector, write);
if ( !dev ) // TODO: Use operator new nothrow!
err(1, "malloc");
Filesystem* fs = new Filesystem(dev, pretend_mount_path);
if ( !fs ) // TODO: Use operator new nothrow!
err(1, "malloc");
// TODO: Remove this debug stuff.
printf("Mounted FAT data_offset=%u, data_sectors=%u, cluster_count=%u, sectors_per_cluster=%u, fat_type=%i\n", data_offset, data_sectors, cluster_count, bpb.sectors_per_cluster, fat_type);
if ( !mount_path )
return 0;
#if defined(__sortix__)
return fsmarshall_main(argv0, mount_path, foreground, fs, dev);
#else
return fat_fuse_main(argv0, mount_path, foreground, fs, dev);
#endif
}

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/*
* Copyright (c) 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fatfs.h
* Implementation of the extended filesystem.
*/
#ifndef EXTFS_H
#define EXTFS_H
extern uid_t request_uid;
extern gid_t request_gid;
class Inode;
mode_t HostModeFromExtMode(uint32_t extmode);
uint32_t ExtModeFromHostMode(mode_t hostmode);
uint8_t HostDTFromExtDT(uint8_t extdt);
void StatInode(Inode* inode, struct stat* st);
#endif

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/*
* Copyright (c) 2013, 2014, 2015, 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* filesystem.cpp
* Filesystem.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <endian.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include "fat.h"
#include "block.h"
#include "device.h"
#include "filesystem.h"
#include "inode.h"
#include "util.h"
// TODO: Be more precise.
static bool is_8_3_char(char c)
{
return ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9');
}
// TODO: Is this fully precise? What about .FOO?
bool is_8_3(const char* name)
{
if ( !name[0] )
return false;
size_t b = 0;
while ( name[b] && is_8_3_char(name[b]) )
b++;
if ( 8 < b )
return false;
if ( !name[b] )
return true;
if ( name[b] != '.' )
return false;
size_t e = 0;
while ( name[b+1+e] && is_8_3_char(name[b+1+e]) )
e++;
if ( 3 < e )
return false;
if ( name[b+1+e] )
return false;
return true;
}
void encode_8_3(const char* decoded, char encoded[8 + 3])
{
size_t i = 0;
for ( size_t o = 0; o < 8 + 3; o++ )
{
char c = ' ';
if ( decoded[i] == '.' && o == 8 )
i++;
if ( decoded[i] && decoded[i] != '.' )
c = decoded[i++];
if ( (unsigned char) c == 0xE5 )
c = 0x05;
encoded[o] = c;
}
}
void decode_8_3(const char encoded[8 + 3], char decoded[8 + 1 + 3 + 1])
{
size_t o = 0;
for ( size_t i = 0; i < 8; i++ )
{
char c = encoded[i];
if ( !c || c == ' ' )
break;
if ( c == 0x05 )
c = (char) 0xE5;
decoded[o++] = c;
}
for ( size_t i = 8; i < 8 + 3; i++ )
{
char c = encoded[i];
if ( !c || c == ' ' )
break;
if ( i == 8 )
decoded[o++] = '.';
if ( c == 0x05 )
c = (char) 0xE5;
decoded[o++] = c;
}
decoded[o] = '\0';
}
uint8_t timespec_to_fat_tenths(struct timespec* ts)
{
// TODO: Work with a struct tm instead.
uint16_t hundreds = ts->tv_nsec / 10000000;
struct tm tm;
gmtime_r(&ts->tv_sec, &tm);
if ( tm.tm_sec & 1 )
hundreds += 100;
return hundreds;
}
uint16_t timespec_to_fat_time(struct timespec* ts)
{
// TODO: Work with a struct tm instead.
struct tm tm;
gmtime_r(&ts->tv_sec, &tm);
return (tm.tm_sec / 2) << 0 | tm.tm_min << 5 | tm.tm_hour << 11;
}
uint16_t timespec_to_fat_date(struct timespec* ts)
{
// TODO: Work with a struct tm instead.
struct tm tm;
gmtime_r(&ts->tv_sec, &tm);
return tm.tm_mday << 0 | (tm.tm_mon + 1) << 5 | (tm.tm_year - 80) << 9;
}
// TODO: Rename tenths to a better name.
void timespec_to_fat(const struct timespec* ts, uint16_t* date, uint16_t* time,
uint8_t* tenths)
{
struct tm tm;
gmtime_r(&ts->tv_sec, &tm);
// TODO: Endian.
*date = tm.tm_mday << 0 | (tm.tm_mon + 1) << 5 | (tm.tm_year - 80) << 9;
*time = (tm.tm_sec / 2) << 0 | tm.tm_min << 5 | tm.tm_hour << 11;
*tenths = ts->tv_nsec / 10000000 + (tm.tm_sec & 1 ? 100 : 0);
}
Filesystem::Filesystem(Device* device, const char* mount_path)
{
this->bpb_block = device->GetBlock(0);
assert(bpb_block); // TODO: This can fail.
this->bpb = (struct fat_bpb*) bpb_block->block_data;
this->device = device;
this->mount_path = mount_path;
this->mode_reg = S_IFREG | 0644;
this->mode_dir = S_IFDIR | 0755;
this->block_size = device->block_size;
this->bytes_per_sector =
bpb->bytes_per_sector_low | bpb->bytes_per_sector_high << 8;
this->root_dirent_count =
bpb->root_dirent_count_low | bpb->root_dirent_count_high << 8;
uint32_t root_dir_sectors =
divup<uint32_t>(root_dirent_count * sizeof(fat_dirent), bytes_per_sector);
this->sectors_per_fat =
bpb->sectors_per_fat ? bpb->sectors_per_fat : bpb->fat32_sectors_per_fat;
this->total_sectors =
bpb->total_sectors_low | bpb->total_sectors_high << 8;
if ( !this->total_sectors )
this->total_sectors = bpb->total_sectors_large;
this->fat_sector = bpb->reserved_sectors;
this->root_sector = fat_sector + bpb->fat_count * sectors_per_fat;
this->data_sector = root_sector + root_dir_sectors;
uint32_t data_sectors = total_sectors - data_sector;
this->cluster_count = data_sectors / bpb->sectors_per_cluster;
this->cluster_size = bpb->sectors_per_cluster * bytes_per_sector;
this->fat_type = cluster_count < 4085 ? 12 : cluster_count < 65525 ? 16 : 32;
// Use cluster 1 as the root inode on FAT12/FAT16 since it's not a valid
// cluster for use in the FAT.
this->root_inode_id = fat_type == 32 ? bpb->fat32_root_cluster : 1;
// TODO: Okay we actually need to compare with their lower bounds.
this->eio_cluster =
fat_type == 12 ? 0xFF7 : fat_type == 16 ? 0xFFF7 : 0xFFFFFF7;
this->eof_cluster =
fat_type == 12 ? 0xFFF : fat_type == 16 ? 0xFFFF : 0xFFFFFFF;
// TODO: Obtain and verify this from the fsinfo.
this->free_search = 0;
this->mru_inode = NULL;
this->lru_inode = NULL;
this->dirty_inode = NULL;
for ( size_t i = 0; i < INODE_HASH_LENGTH; i++ )
this->hash_inodes[i] = NULL;
this->dirty = false;
if ( device->write )
{
BeginWrite();
// TODO: Mark as mounted in fat[1] if FAT16/32.
FinishWrite();
Sync();
}
}
Filesystem::~Filesystem()
{
Sync();
while ( mru_inode )
delete mru_inode;
if ( device->write )
{
BeginWrite();
// TODO: Mark as unounted in fat[1] if FAT16/32.
FinishWrite();
Sync();
}
bpb_block->Unref();
}
void Filesystem::BeginWrite()
{
bpb_block->BeginWrite();
}
void Filesystem::FinishWrite()
{
dirty = true;
bpb_block->FinishWrite();
}
void Filesystem::Sync()
{
// TODO: Replacement concept?
while ( dirty_inode )
dirty_inode->Sync();
if ( dirty )
{
bpb_block->Sync();
dirty = false;
}
device->Sync();
}
Inode* Filesystem::GetInode(uint32_t inode_id, Block* dirent_block,
struct fat_dirent* dirent)
{
#if 0
if ( !inode_id || num_inodes <= inode_id )
return errno = EBADF, (Inode*) NULL;
if ( !inode_id )
return errno = EBADF, (Inode*) NULL;
#endif
size_t bin = inode_id % INODE_HASH_LENGTH;
for ( Inode* iter = hash_inodes[bin]; iter; iter = iter->next_hashed )
if ( iter->inode_id == inode_id )
return iter->Refer(), iter;
if ( inode_id != root_inode_id && !dirent_block )
return errno = EBADF, (Inode*) NULL;
Inode* inode = new Inode(this, inode_id);
if ( !inode )
return (Inode*) NULL;
inode->first_cluster =
inode_id == root_inode_id && fat_type != 32 ? 0 : inode_id;
if ( (inode->data_block = dirent_block) )
inode->data_block->Refer();
inode->dirent = dirent;
inode->Prelink();
return inode;
}
uint32_t Filesystem::AllocateCluster()
{
for ( size_t i = 0; i < cluster_count; i++ )
{
size_t n = 2 + (free_search + i) % cluster_count;
if ( !ReadFAT(n) )
{
free_search = (i + 1) % cluster_count;
if ( fat_type == 32 )
{
Block* block = device->GetBlock(bpb->fat32_fsinfo);
if ( block )
{
struct fat_fsinfo* fsinfo =
(struct fat_fsinfo*) block->block_data;
block->BeginWrite();
uint32_t free_count = le32toh(fsinfo->free_count);
if ( free_count )
free_count--;
fsinfo->free_count = htole32(free_count);
fsinfo->next_free = n;
block->FinishWrite();
block->Unref();
}
}
return n;
}
}
return errno = ENOSPC, 0;
}
void Filesystem::FreeCluster(uint32_t cluster)
{
if ( fat_type != 32 )
return;
Block* block = device->GetBlock(bpb->fat32_fsinfo);
if ( !block )
return;
struct fat_fsinfo* fsinfo = (struct fat_fsinfo*) block->block_data;
block->BeginWrite();
uint32_t free_count = le32toh(fsinfo->free_count);
if ( free_count < cluster_count )
free_count++;
fsinfo->free_count = htole32(free_count);
if ( !fsinfo->free_count || le32toh(fsinfo->next_free) == cluster + 1 )
{
fsinfo->next_free = htole32(cluster);
free_search = cluster - 2;
}
block->FinishWrite();
block->Unref();
}
uint32_t Filesystem::ReadFAT(uint32_t cluster)
{
// TODO: Bounds check.
if ( fat_type == 12 )
{
size_t position = cluster + (cluster / 2);
size_t lba = position / bytes_per_sector;
size_t offset = position % bytes_per_sector;
Block* block = device->GetBlock(fat_sector + lba);
if ( !block )
return eio_cluster;
uint8_t lower = block->block_data[offset];
if ( ++offset == bytes_per_sector )
{
block->Unref();
if ( !(block = device->GetBlock(fat_sector + lba)) )
return eio_cluster;
offset = 0;
}
uint8_t higher = block->block_data[offset];
block->Unref();
uint16_t value = lower | higher << 8;
if ( cluster & 1 )
return value >> 4;
else
return value & 0xFFF;
}
size_t fat_size = fat_type / 8;
size_t position = cluster * fat_size;
size_t lba = position / bytes_per_sector;
size_t entry = (position % bytes_per_sector) / fat_size;
Block* block = device->GetBlock(fat_sector + lba);
if ( !block )
return eio_cluster;
uint32_t result = 0;
if ( fat_type == 16 )
result = ((uint16_t*) block->block_data)[entry];
else if ( fat_type == 32 )
result = ((uint32_t*) block->block_data)[entry] & 0x0FFFFFFF;
block->Unref();
return result;
}
bool Filesystem::WriteFAT(uint32_t cluster, uint32_t value)
{
assert(device->write);
// TODO: Bounds check.
if ( fat_type == 12 )
{
size_t position = cluster + (cluster / 2);
size_t lba = position / bytes_per_sector;
size_t offset = position % bytes_per_sector;
Block* block = device->GetBlock(fat_sector + lba);
if ( !block )
return false;
value = cluster & 1 ? value << 4 : value;
uint16_t mask = cluster & 1 ? 0xFFF0 : 0x0FFF;
block->BeginWrite();
block->block_data[offset] &= ~mask;
block->block_data[offset] |= value;
if ( ++offset == bytes_per_sector )
{
block->FinishWrite();
block->Unref();
if ( !(block = device->GetBlock(fat_sector + lba)) )
return false;
offset = 0;
block->BeginWrite();
}
block->block_data[offset] &= ~(mask >> 8);
block->block_data[offset] |= value >> 8;
block->FinishWrite();
block->Unref();
return true;
}
// TODO: Mirror to the other FATs.
size_t fat_size = fat_type / 8;
size_t position = cluster * fat_size;
size_t lba = position / bytes_per_sector;
size_t entry = (position % bytes_per_sector) / fat_size;
Block* block = device->GetBlock(fat_sector + lba);
if ( !block )
return false;
block->BeginWrite();
if ( fat_type == 16 )
((uint16_t*) block->block_data)[entry] = value;
else if ( fat_type == 32 )
{
uint32_t old = ((uint32_t*) block->block_data)[entry] & 0xF0000000;
((uint32_t*) block->block_data)[entry] = value | old;
}
block->FinishWrite();
block->Unref();
return true;
}
uint32_t Filesystem::CalculateFreeCount()
{
if ( fat_type == 32 )
{
// TODO: Verify the fsinfo.
Block* block = device->GetBlock(bpb->fat32_fsinfo);
if ( !block )
return 0xFFFFFFFF;
const struct fat_fsinfo* fsinfo =
(const struct fat_fsinfo*) block->block_data;
uint32_t result = le32toh(fsinfo->free_count);
block->Unref();
if ( result != 0xFFFFFFFF )
return result;
}
// TODO: Cache these.
size_t count = 0;
for ( size_t i = 0; i < cluster_count; i++ )
if ( !ReadFAT(2 + i) )
count++;
return count;
}

88
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/*
* Copyright (c) 2013, 2014, 2015, 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* filesystem.h
* Filesystem.
*/
#ifndef FILESYSTEM_H
#define FILESYSTEM_H
bool is_8_3(const char* name);
void encode_8_3(const char* decoded, char encoded[8 + 3]);
void decode_8_3(const char encoded[8 + 3], char decoded[8 + 1 + 3 + 1]);
void timespec_to_fat(const struct timespec* ts, uint16_t* date, uint16_t* time,
uint8_t* tenths);
// TODO: Unify into the above.
uint8_t timespec_to_fat_tenths(struct timespec* ts);
uint16_t timespec_to_fat_time(struct timespec* ts);
uint16_t timespec_to_fat_date(struct timespec* ts);
class Device;
class Inode;
static const size_t INODE_HASH_LENGTH = 1 << 16;
class Filesystem
{
public:
Filesystem(Device* device, const char* mount_path);
~Filesystem();
public:
Block* bpb_block;
struct fat_bpb* bpb;
Device* device;
const char* mount_path;
mode_t mode_reg;
mode_t mode_dir;
uid_t uid;
gid_t gid;
uint32_t block_size;
uint16_t bytes_per_sector;
uint16_t root_dirent_count;
uint32_t sectors_per_fat;
uint32_t root_inode_id;
uint32_t total_sectors;
uint32_t fat_sector; // TODO: Rename to lba
uint32_t root_sector; // TODO: Rename to lba
uint32_t data_sector; // TODO: Rename to lba
uint32_t cluster_count;
uint32_t cluster_size;
uint8_t fat_type;
uint32_t eio_cluster;
uint32_t eof_cluster;
uint32_t free_search;
Inode* mru_inode;
Inode* lru_inode;
Inode* dirty_inode;
Inode* hash_inodes[INODE_HASH_LENGTH];
bool dirty;
public:
Inode* GetInode(uint32_t inode_id, Block* dirent_block = NULL,
struct fat_dirent* dirent = NULL);
uint32_t AllocateCluster();
void FreeCluster(uint32_t cluster);
uint32_t ReadFAT(uint32_t cluster);
bool WriteFAT(uint32_t cluster, uint32_t value);
uint32_t CalculateFreeCount();
void BeginWrite();
void FinishWrite();
void Sync();
};
#endif

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/*
* Copyright (c) 2013, 2014, 2015, 2016, 2022, 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fsmarshall.cpp
* Sortix fsmarshall frontend.
*/
#if defined(__sortix__)
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <ioleast.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timespec.h>
#include <unistd.h>
#include <sortix/dirent.h>
#include <fsmarshall.h>
#include "block.h"
#include "device.h"
#include "fat.h"
#include "fatfs.h"
#include "filesystem.h"
#include "fsmarshall.h"
#include "fuse.h"
#include "inode.h"
bool RespondData(int chl, const void* ptr, size_t count)
{
return writeall(chl, ptr, count) == count;
}
bool RespondHeader(int chl, size_t type, size_t size)
{
struct fsm_msg_header hdr;
hdr.msgtype = type;
hdr.msgsize = size;
return RespondData(chl, &hdr, sizeof(hdr));
}
bool RespondMessage(int chl, size_t type, const void* ptr, size_t count)
{
return RespondHeader(chl, type, count) &&
RespondData(chl, ptr, count);
}
bool RespondError(int chl, int errnum)
{
struct fsm_resp_error body;
body.errnum = errnum;
//fprintf(stderr, "fatfs: sending error %i (%s)\n", errnum, strerror(errnum));
return RespondMessage(chl, FSM_RESP_ERROR, &body, sizeof(body));
}
bool RespondSuccess(int chl)
{
struct fsm_resp_success body;
return RespondMessage(chl, FSM_RESP_SUCCESS, &body, sizeof(body));
}
bool RespondStat(int chl, struct stat* st)
{
struct fsm_resp_stat body;
body.st = *st;
return RespondMessage(chl, FSM_RESP_STAT, &body, sizeof(body));
}
bool RespondStatVFS(int chl, struct statvfs* stvfs)
{
struct fsm_resp_statvfs body;
body.stvfs = *stvfs;
return RespondMessage(chl, FSM_RESP_STATVFS, &body, sizeof(body));
}
bool RespondSeek(int chl, off_t offset)
{
struct fsm_resp_lseek body;
body.offset = offset;
return RespondMessage(chl, FSM_RESP_LSEEK, &body, sizeof(body));
}
bool RespondRead(int chl, const uint8_t* buf, size_t count)
{
struct fsm_resp_read body;
body.count = count;
return RespondMessage(chl, FSM_RESP_READ, &body, sizeof(body)) &&
RespondData(chl, buf, count);
}
bool RespondReadlink(int chl, const uint8_t* buf, size_t count)
{
struct fsm_resp_readlink body;
body.targetlen = count;
return RespondMessage(chl, FSM_RESP_READLINK, &body, sizeof(body)) &&
RespondData(chl, buf, count);
}
bool RespondWrite(int chl, size_t count)
{
struct fsm_resp_write body;
body.count = count;
return RespondMessage(chl, FSM_RESP_WRITE, &body, sizeof(body));
}
bool RespondOpen(int chl, ino_t ino, mode_t type)
{
struct fsm_resp_open body;
body.ino = ino;
body.type = type;
return RespondMessage(chl, FSM_RESP_OPEN, &body, sizeof(body));
}
bool RespondMakeDir(int chl, ino_t ino)
{
struct fsm_resp_mkdir body;
body.ino = ino;
return RespondMessage(chl, FSM_RESP_MKDIR, &body, sizeof(body));
}
bool RespondReadDir(int chl, struct dirent* dirent)
{
struct fsm_resp_readdirents body;
body.ino = dirent->d_ino;
body.type = dirent->d_type;
body.namelen = dirent->d_namlen;
return RespondMessage(chl, FSM_RESP_READDIRENTS, &body, sizeof(body)) &&
RespondData(chl, dirent->d_name, dirent->d_namlen);
}
bool RespondTCGetBlob(int chl, const void* data, size_t data_size)
{
struct fsm_resp_tcgetblob body;
body.count = data_size;
return RespondMessage(chl, FSM_RESP_TCGETBLOB, &body, sizeof(body)) &&
RespondData(chl, data, data_size);
}
Inode* SafeGetInode(Filesystem* fs, ino_t ino)
{
if ( (uint32_t) ino != ino )
return errno = EBADF, (Inode*) NULL;
return fs->GetInode((uint32_t) ino);
}
void HandleRefer(int chl, struct fsm_req_refer* msg, Filesystem* fs)
{
(void) chl;
if ( Inode* inode = SafeGetInode(fs, (uint32_t) msg->ino) )
{
if ( inode->implied_reference )
inode->implied_reference--;
else
inode->RemoteRefer();
inode->Unref();
}
}
void HandleUnref(int chl, struct fsm_req_unref* msg, Filesystem* fs)
{
(void) chl;
if ( Inode* inode = SafeGetInode(fs, (uint32_t) msg->ino) )
{
inode->RemoteUnref();
inode->Unref();
}
}
void HandleSync(int chl, struct fsm_req_sync* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
inode->Sync();
inode->Unref();
RespondSuccess(chl);
}
void HandleStat(int chl, struct fsm_req_stat* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
struct stat st;
StatInode(inode, &st);
inode->Unref();
RespondStat(chl, &st);
}
void HandleChangeMode(int chl, struct fsm_req_chmod* msg, Filesystem* fs)
{
if ( !fs->device->write ) { RespondError(chl, EROFS); return; }
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
if ( !inode->ChangeMode(msg->mode) )
RespondError(chl, errno);
else
RespondSuccess(chl);
inode->Unref();
}
void HandleChangeOwner(int chl, struct fsm_req_chown* msg, Filesystem* fs)
{
if ( !fs->device->write ) { RespondError(chl, EROFS); return; }
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
if ( !inode->ChangeOwner(msg->uid, msg->gid) )
RespondError(chl, errno);
else
RespondSuccess(chl);
inode->Unref();
}
void HandleUTimens(int chl, struct fsm_req_utimens* msg, Filesystem* fs)
{
if ( !fs->device->write ) { RespondError(chl, EROFS); return; }
Inode* inode = SafeGetInode(fs, msg->ino);
inode->UTimens(msg->times);
inode->Unref();
RespondSuccess(chl);
}
void HandleTruncate(int chl, struct fsm_req_truncate* msg, Filesystem* fs)
{
if ( !fs->device->write ) { RespondError(chl, EROFS); return; }
if ( msg->size < 0 ) { RespondError(chl, EINVAL); return; }
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
inode->Truncate((uint64_t) msg->size);
inode->Unref();
RespondSuccess(chl);
}
void HandleSeek(int chl, struct fsm_req_lseek* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
if ( msg->whence == SEEK_SET )
RespondSeek(chl, msg->offset);
else if ( msg->whence == SEEK_END )
{
off_t inode_size = inode->Size();
if ( (msg->offset < 0 && inode_size + msg->offset < 0) ||
(0 <= msg->offset && OFF_MAX - inode_size < msg->offset) )
RespondError(chl, EOVERFLOW);
else
RespondSeek(chl, msg->offset + inode_size);
}
else
RespondError(chl, EINVAL);
inode->Unref();
}
void HandleReadAt(int chl, struct fsm_req_pread* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
uint8_t* buf = (uint8_t*) malloc(msg->count);
if ( !buf ) { inode->Unref(); RespondError(chl, errno); return; }
ssize_t amount = inode->ReadAt(buf, msg->count, msg->offset);
inode->Unref();
if ( amount < 0 ) { free(buf); RespondError(chl, errno); return; }
RespondRead(chl, buf, amount);
free(buf);
}
void HandleWriteAt(int chl, struct fsm_req_pwrite* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
const uint8_t* buf = (const uint8_t*) &msg[1];
ssize_t amount = inode->WriteAt(buf, msg->count, msg->offset);
inode->Unref();
if ( amount < 0 ) { RespondError(chl, errno); return; }
RespondWrite(chl, amount);
}
void HandleOpen(int chl, struct fsm_req_open* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->dirino);
if ( !inode ) { RespondError(chl, errno); return; }
char* pathraw = (char*) &(msg[1]);
char* path = (char*) malloc(msg->namelen+1);
if ( !path )
{
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(path, pathraw, msg->namelen);
path[msg->namelen] = '\0';
Inode* result = inode->Open(path, msg->flags, msg->mode & 07777);
free(path);
inode->Unref();
if ( !result ) { RespondError(chl, errno); return; }
RespondOpen(chl, result->inode_id, result->Mode() & S_IFMT);
// TODO: Unfortunately Open does not implicitly imply RemoteRefer so we need
// to try and pretend that it does so the inode isn't destroyed early.
result->implied_reference++;
result->RemoteRefer();
result->Unref();
}
void HandleMakeDir(int chl, struct fsm_req_mkdir* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->dirino);
if ( !inode ) { RespondError(chl, errno); return; }
char* pathraw = (char*) &(msg[1]);
char* path = (char*) malloc(msg->namelen+1);
if ( !path )
{
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(path, pathraw, msg->namelen);
path[msg->namelen] = '\0';
Inode* result = inode->CreateDirectory(path, msg->mode & 07777);
free(path);
inode->Unref();
if ( !result ) { RespondError(chl, errno); return; }
RespondMakeDir(chl, result->inode_id);
result->Unref();
}
// TODO: Encapsulate.
void HandleReadDir(int chl, struct fsm_req_readdirents* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
if ( !S_ISDIR(inode->Mode()) )
{
inode->Unref();
RespondError(chl, ENOTDIR);
return;
}
union
{
struct dirent kernel_entry;
// TODO: Adjust with LFN's real limit.
uint8_t padding[sizeof(struct dirent) + 256];
};
memset(&kernel_entry, 0, sizeof(kernel_entry));
if ( inode->inode_id == inode->filesystem->root_inode_id )
{
if ( msg->rec_num < 2 )
{
const char* name = msg->rec_num ? ".." : ".";
size_t name_len = strlen(name);
kernel_entry.d_reclen = sizeof(kernel_entry) + name_len;
kernel_entry.d_ino = inode->inode_id;
kernel_entry.d_dev = 0;
kernel_entry.d_type = DT_DIR;
kernel_entry.d_namlen = name_len;
memcpy(kernel_entry.d_name, name, name_len);
size_t dname_offset = offsetof(struct dirent, d_name);
padding[dname_offset + kernel_entry.d_namlen] = '\0';
RespondReadDir(chl, &kernel_entry);
return;
}
msg->rec_num -= 2;
}
uint32_t cluster = inode->first_cluster;
uint8_t sector = 0;
uint16_t offset = 0;
Block* block = NULL;
while ( inode->Iterate(&block, &cluster, &sector, &offset) )
{
const uint8_t* block_data = block->block_data + offset;
const struct fat_dirent* entry = (const struct fat_dirent*) block_data;
if ( !entry->name[0] )
break;
if ( (unsigned char) entry->name[0] != 0xE5 &&
!(entry->attributes & FAT_ATTRIBUTE_VOLUME_ID) &&
!(msg->rec_num--) )
{
char name[8 + 1 + 3 + 1];
decode_8_3(entry->name, name);
size_t name_len = strnlen(entry->name, sizeof(entry->name));
uint8_t file_type =
entry->attributes & FAT_ATTRIBUTE_DIRECTORY ? DT_DIR : DT_REG;
kernel_entry.d_reclen = sizeof(kernel_entry) + name_len;
kernel_entry.d_ino = entry->cluster_low | entry->cluster_high << 16;
kernel_entry.d_dev = 0;
kernel_entry.d_type = file_type;
kernel_entry.d_namlen = name_len;
memcpy(kernel_entry.d_name, name, name_len);
size_t dname_offset = offsetof(struct dirent, d_name);
padding[dname_offset + kernel_entry.d_namlen] = '\0';
block->Unref();
inode->Unref();
RespondReadDir(chl, &kernel_entry);
return;
}
offset += sizeof(struct fat_dirent);
}
int errnum = errno;
if ( block )
block->Unref();
inode->Unref();
if ( errnum )
{
RespondError(chl, errnum);
return;
}
kernel_entry.d_reclen = sizeof(kernel_entry);
RespondReadDir(chl, &kernel_entry);
}
void HandleIsATTY(int chl, struct fsm_req_isatty* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->ino);
if ( !inode ) { RespondError(chl, errno); return; }
RespondError(chl, ENOTTY);
inode->Unref();
}
void HandleUnlink(int chl, struct fsm_req_unlink* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->dirino);
if ( !inode ) { RespondError(chl, errno); return; }
char* pathraw = (char*) &(msg[1]);
char* path = (char*) malloc(msg->namelen+1);
if ( !path )
{
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(path, pathraw, msg->namelen);
path[msg->namelen] = '\0';
bool result = inode->Unlink(path, false);
free(path);
inode->Unref();
if ( !result ) { RespondError(chl, errno); return; }
RespondSuccess(chl);
}
void HandleRemoveDir(int chl, struct fsm_req_rmdir* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->dirino);
if ( !inode ) { RespondError(chl, errno); return; }
char* pathraw = (char*) &(msg[1]);
char* path = (char*) malloc(msg->namelen+1);
if ( !path )
{
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(path, pathraw, msg->namelen);
path[msg->namelen] = '\0';
bool result = inode->RemoveDirectory(path);
free(path);
inode->Unref();
if ( !result ) { RespondError(chl, errno); return; }
RespondSuccess(chl);
}
void HandleLink(int chl, struct fsm_req_link* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->dirino);
if ( !inode ) { RespondError(chl, errno); return; }
Inode* dest = SafeGetInode(fs, msg->linkino);
if ( !dest ) { inode->Unref(); RespondError(chl, errno); return; }
char* pathraw = (char*) &(msg[1]);
char* path = (char*) malloc(msg->namelen+1);
if ( !path )
{
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(path, pathraw, msg->namelen);
path[msg->namelen] = '\0';
bool result = inode->Link(path, dest, false);
free(path);
dest->Unref();
inode->Unref();
if ( !result ) { RespondError(chl, errno); return; }
RespondSuccess(chl);
}
void HandleSymlink(int chl, struct fsm_req_symlink* msg, Filesystem* fs)
{
Inode* inode = SafeGetInode(fs, msg->dirino);
if ( !inode ) { RespondError(chl, errno); return; }
char* dest_raw = (char*) &(msg[1]);
char* dest = (char*) malloc(msg->targetlen + 1);
if ( !dest )
{
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(dest, dest_raw, msg->targetlen);
dest[msg->targetlen] = '\0';
char* path_raw = (char*) dest_raw + msg->targetlen;
char* path = (char*) malloc(msg->namelen + 1);
if ( !path )
{
free(dest);
RespondError(chl, errno);
inode->Unref();
return;
}
memcpy(path, path_raw, msg->namelen);
path[msg->namelen] = '\0';
bool result = inode->Symlink(path, dest);
free(path);
free(dest);
inode->Unref();
if ( !result ) { RespondError(chl, errno); return; }
RespondSuccess(chl);
}
void HandleReadlink(int chl, struct fsm_req_readlink* msg, Filesystem* fs)
{
(void) msg;
(void) fs;
RespondError(chl, EINVAL);
}
void HandleRename(int chl, struct fsm_req_rename* msg, Filesystem* fs)
{
char* pathraw = (char*) &(msg[1]);
char* path = (char*) malloc(msg->oldnamelen+1 + msg->newnamelen+1);
if ( !path ) { RespondError(chl, errno); return; }
memcpy(path, pathraw, msg->oldnamelen);
path[msg->oldnamelen] = '\0';
memcpy(path + msg->oldnamelen + 1, pathraw + msg->oldnamelen, msg->newnamelen);
path[msg->oldnamelen + 1 + msg->newnamelen] = '\0';
const char* oldname = path;
const char* newname = path + msg->oldnamelen + 1;
Inode* olddir = SafeGetInode(fs, msg->olddirino);
if ( !olddir ) { free(path); RespondError(chl, errno); return; }
Inode* newdir = SafeGetInode(fs, msg->newdirino);
if ( !newdir ) { olddir->Unref(); free(path); RespondError(chl, errno); return; }
bool result = newdir->Rename(olddir, oldname, newname);
newdir->Unref();
olddir->Unref();
free(path);
if ( !result ) { RespondError(chl, errno); return; }
RespondSuccess(chl);
}
void HandleStatVFS(int chl, struct fsm_req_statvfs* msg, Filesystem* fs)
{
(void) msg;
struct statvfs stvfs;
stvfs.f_bsize = fs->cluster_size;
stvfs.f_frsize = fs->cluster_size;
stvfs.f_blocks = fs->cluster_count;
// TODO: Locate FsInfo and count on FAT12/FAT16.
stvfs.f_bfree = fs->CalculateFreeCount();
stvfs.f_bavail = stvfs.f_bfree;
stvfs.f_files = stvfs.f_blocks;
stvfs.f_ffree = stvfs.f_bfree;
stvfs.f_favail = stvfs.f_files;
stvfs.f_fsid = 0;
stvfs.f_flag = 0;
if ( !fs->device->write )
stvfs.f_flag |= ST_RDONLY;
stvfs.f_namemax = 8 + 3; // TODO: Long file name support.
RespondStatVFS(chl, &stvfs);
}
void HandleTCGetBlob(int chl, struct fsm_req_tcgetblob* msg, Filesystem* fs)
{
char* nameraw = (char*) &(msg[1]);
char* name = (char*) malloc(msg->namelen + 1);
if ( !name )
return (void) RespondError(chl, errno);
memcpy(name, nameraw, msg->namelen);
name[msg->namelen] = '\0';
static const char index[] =
"device-path\0filesystem-type\0filesystem-uuid\0mount-path\0"
"fat-size\0volume-id\0volume-label\0";
if ( !strcmp(name, "") )
RespondTCGetBlob(chl, index, sizeof(index) - 1);
else if ( !strcmp(name, "device-path") )
RespondTCGetBlob(chl, fs->device->path, strlen(fs->device->path));
else if ( !strcmp(name, "filesystem-type") )
RespondTCGetBlob(chl, "fat", strlen("fat"));
else if ( !strcmp(name, "fat-size") )
{
const char* str = fs->fat_type == 32 ? "32" :
fs->fat_type == 16 ? "16" : "12";
RespondTCGetBlob(chl, str, strlen(str));
}
else if ( !strcmp(name, "filesystem-uuid") )
{
unsigned char uuid[16];
if ( fs->fat_type == 32 )
{
memcpy(uuid, &fs->bpb->fat32_volume_id, 4);
memcpy(uuid + 4, &fs->bpb->fat32_volume_label, 11);
}
else
{
memcpy(uuid, &fs->bpb->fat12_volume_id, 4);
memcpy(uuid + 4, &fs->bpb->fat12_volume_label, 11);
}
uuid[15] = '\0';
RespondTCGetBlob(chl, uuid, sizeof(uuid));
}
else if ( !strcmp(name, "volume-id") )
{
if ( fs->fat_type == 32 )
RespondTCGetBlob(chl, &fs->bpb->fat32_volume_id, 4);
else
RespondTCGetBlob(chl, &fs->bpb->fat12_volume_id, 4);
}
else if ( !strcmp(name, "volume-label") )
{
if ( fs->fat_type == 32 )
RespondTCGetBlob(chl, &fs->bpb->fat32_volume_label, 11);
else
RespondTCGetBlob(chl, &fs->bpb->fat12_volume_label, 11);
}
else if ( !strcmp(name, "mount-path") )
RespondTCGetBlob(chl, fs->mount_path, strlen(fs->mount_path));
else
RespondError(chl, ENOENT);
free(name);
}
void HandleIncomingMessage(int chl, struct fsm_msg_header* hdr, Filesystem* fs)
{
request_uid = hdr->uid;
request_gid = hdr->gid;
typedef void (*handler_t)(int, void*, Filesystem*);
handler_t handlers[FSM_MSG_NUM] = { NULL };
handlers[FSM_REQ_SYNC] = (handler_t) HandleSync;
handlers[FSM_REQ_STAT] = (handler_t) HandleStat;
handlers[FSM_REQ_CHMOD] = (handler_t) HandleChangeMode;
handlers[FSM_REQ_CHOWN] = (handler_t) HandleChangeOwner;
handlers[FSM_REQ_TRUNCATE] = (handler_t) HandleTruncate;
handlers[FSM_REQ_LSEEK] = (handler_t) HandleSeek;
handlers[FSM_REQ_PREAD] = (handler_t) HandleReadAt;
handlers[FSM_REQ_OPEN] = (handler_t) HandleOpen;
handlers[FSM_REQ_READDIRENTS] = (handler_t) HandleReadDir;
handlers[FSM_REQ_PWRITE] = (handler_t) HandleWriteAt;
handlers[FSM_REQ_ISATTY] = (handler_t) HandleIsATTY;
handlers[FSM_REQ_UTIMENS] = (handler_t) HandleUTimens;
handlers[FSM_REQ_MKDIR] = (handler_t) HandleMakeDir;
handlers[FSM_REQ_RMDIR] = (handler_t) HandleRemoveDir;
handlers[FSM_REQ_UNLINK] = (handler_t) HandleUnlink;
handlers[FSM_REQ_LINK] = (handler_t) HandleLink;
handlers[FSM_REQ_SYMLINK] = (handler_t) HandleSymlink;
handlers[FSM_REQ_READLINK] = (handler_t) HandleReadlink;
handlers[FSM_REQ_RENAME] = (handler_t) HandleRename;
handlers[FSM_REQ_REFER] = (handler_t) HandleRefer;
handlers[FSM_REQ_UNREF] = (handler_t) HandleUnref;
handlers[FSM_REQ_STATVFS] = (handler_t) HandleStatVFS;
handlers[FSM_REQ_TCGETBLOB] = (handler_t) HandleTCGetBlob;
if ( FSM_MSG_NUM <= hdr->msgtype || !handlers[hdr->msgtype] )
{
warn("message type %zu not supported\n", hdr->msgtype);
RespondError(chl, ENOTSUP);
return;
}
uint8_t body_buffer[65536];
uint8_t* body = body_buffer;
if ( sizeof(body_buffer) < hdr->msgsize )
{
body = (uint8_t*) mmap(NULL, hdr->msgsize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if ( (void*) body == MAP_FAILED )
{
RespondError(chl, errno);
return;
}
}
if ( readall(chl, body, hdr->msgsize) == hdr->msgsize )
handlers[hdr->msgtype](chl, body, fs);
else
RespondError(chl, errno);
if ( sizeof(body_buffer) < hdr->msgsize )
munmap(body, hdr->msgsize);
}
static volatile bool should_terminate = false;
void TerminationHandler(int)
{
should_terminate = true;
}
static void ready(void)
{
const char* readyfd_env = getenv("READYFD");
if ( !readyfd_env )
return;
int readyfd = atoi(readyfd_env);
char c = '\n';
write(readyfd, &c, 1);
close(readyfd);
unsetenv("READYFD");
}
int fsmarshall_main(const char* argv0,
const char* mount_path,
bool foreground,
Filesystem* fs,
Device* dev)
{
(void) argv0;
// Stat the root directory;
struct stat root_dir_st;
memset(&root_dir_st, 0, sizeof(root_dir_st));
root_dir_st.st_ino = fs->root_inode_id;
root_dir_st.st_mode = S_IFDIR | 0755;
// Create a filesystem server connected to the kernel that we'll listen on.
int serverfd = fsm_mountat(AT_FDCWD, mount_path, &root_dir_st, 0);
if ( serverfd < 0 )
err(1, "%s", mount_path);
// Make sure the server isn't unexpectedly killed and data is lost.
signal(SIGINT, TerminationHandler);
signal(SIGTERM, TerminationHandler);
signal(SIGQUIT, TerminationHandler);
// Become a background process in its own process group by default.
if ( !foreground )
{
pid_t child_pid = fork();
if ( child_pid < 0 )
err(1, "fork");
if ( child_pid )
exit(0);
setpgid(0, 0);
}
else
ready();
dev->SpawnSyncThread();
// Listen for filesystem messages and sync the filesystem every few seconds.
struct timespec last_sync_at;
clock_gettime(CLOCK_MONOTONIC, &last_sync_at);
int channel;
while ( 0 <= (channel = accept(serverfd, NULL, NULL)) )
{
if ( should_terminate )
break;
struct fsm_msg_header hdr;
size_t amount;
if ( (amount = readall(channel, &hdr, sizeof(hdr))) != sizeof(hdr) )
{
//warn("incomplete header: got %zi of %zu bytes", amount, sizeof(hdr));
errno = 0;
continue;
}
HandleIncomingMessage(channel, &hdr, fs);
close(channel);
if ( dev->write && !dev->has_sync_thread )
{
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
if ( 5 <= timespec_sub(now, last_sync_at).tv_sec )
{
fs->Sync();
last_sync_at = now;
}
}
}
// TODO: Replace with FAT concept.
// Garbage collect all open inode references.
while ( fs->mru_inode )
{
Inode* inode = fs->mru_inode;
if ( inode->remote_reference_count )
inode->RemoteUnref();
else if ( inode->reference_count )
inode->Unref();
}
// Sync the filesystem before shutting down.
if ( dev->write )
fs->Sync();
close(serverfd);
delete fs;
delete dev;
return 0;
}
#endif

31
fat/fsmarshall.h Normal file
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@ -0,0 +1,31 @@
/*
* Copyright (c) 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fsmarshall.h
* Sortix fsmarshall frontend.
*/
#ifndef FSMARSHALL_H
#define FSMARSHALL_H
class Device;
class Filesystem;
int fsmarshall_main(const char* argv0,
const char* mount_path,
bool foreground,
Filesystem* fs,
Device* dev);
#endif

618
fat/fuse.cpp Normal file
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/*
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fuse.cpp
* FUSE frontend.
*/
#if !defined(__sortix__)
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#define FUSE_USE_VERSION 26
#include <fuse.h>
#include "ext-constants.h"
#include "ext-structs.h"
#include "blockgroup.h"
#include "block.h"
#include "device.h"
#include "fatfs.h"
#include "filesystem.h"
#include "fuse.h"
#include "inode.h"
struct fat_fuse_ctx
{
Device* dev;
Filesystem* fs;
};
#ifndef S_SETABLE
#define S_SETABLE 02777
#endif
#define FUSE_FS (((struct fat_fuse_ctx*) (fuse_get_context()->private_data))->fs)
void* fat_fuse_init(struct fuse_conn_info* /*conn*/)
{
return fuse_get_context()->private_data;
}
void fat_fuse_destroy(void* fs_private)
{
struct fat_fuse_ctx* fat_fuse_ctx = (struct fat_fuse_ctx*) fs_private;
while ( fat_fuse_ctx->fs->mru_inode )
{
Inode* inode = fat_fuse_ctx->fs->mru_inode;
if ( inode->remote_reference_count )
inode->RemoteUnref();
else if ( inode->reference_count )
inode->Unref();
}
fat_fuse_ctx->fs->Sync();
fat_fuse_ctx->dev->Sync();
delete fat_fuse_ctx->fs; fat_fuse_ctx->fs = NULL;
delete fat_fuse_ctx->dev; fat_fuse_ctx->dev = NULL;
}
Inode* fat_fuse_resolve_path(const char* path)
{
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode(FAT_ROOT_INO);
if ( !inode )
return (Inode*) NULL;
while ( path[0] )
{
if ( *path == '/' )
{
if ( !FAT_S_ISDIR(inode->Mode()) )
return inode->Unref(), errno = ENOTDIR, (Inode*) NULL;
path++;
continue;
}
size_t elem_len = strcspn(path, "/");
char* elem = strndup(path, elem_len);
if ( !elem )
return inode->Unref(), errno = ENOTDIR, (Inode*) NULL;
path += elem_len;
Inode* next = inode->Open(elem, O_RDONLY, 0);
free(elem);
inode->Unref();
if ( !next )
return NULL;
inode = next;
}
return inode;
}
// Assumes that the path doesn't end with / unless it's the root directory.
Inode* fat_fuse_parent_dir(const char** path_ptr)
{
const char* path = *path_ptr;
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode(FAT_ROOT_INO);
if ( !inode )
return (Inode*) NULL;
while ( strchr(path, '/') )
{
if ( *path == '/' )
{
if ( !FAT_S_ISDIR(inode->Mode()) )
return inode->Unref(), errno = ENOTDIR, (Inode*) NULL;
path++;
continue;
}
size_t elem_len = strcspn(path, "/");
char* elem = strndup(path, elem_len);
if ( !elem )
return inode->Unref(), errno = ENOTDIR, (Inode*) NULL;
path += elem_len;
Inode* next = inode->Open(elem, O_RDONLY, 0);
free(elem);
inode->Unref();
if ( !next )
return (Inode*) NULL;
inode = next;
}
*path_ptr = *path ? path : ".";
assert(!strchr(*path_ptr, '/'));
return inode;
}
int fat_fuse_getattr(const char* path, struct stat* st)
{
Inode* inode = fat_fuse_resolve_path(path);
if ( !inode )
return -errno;
StatInode(inode, st);
inode->Unref();
return 0;
}
int fat_fuse_fgetattr(const char* /*path*/, struct stat* st,
struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
StatInode(inode, st);
inode->Unref();
return 0;
}
int fat_fuse_readlink(const char* path, char* buf, size_t bufsize)
{
Inode* inode = fat_fuse_resolve_path(path);
if ( !inode )
return -errno;
if ( !FAT_S_ISLNK(inode->Mode()) )
return inode->Unref(), -(errno = EINVAL);
if ( !bufsize )
return inode->Unref(), -(errno = EINVAL);
ssize_t amount = inode->ReadAt((uint8_t*) buf, bufsize, 0);
if ( amount < 0 )
return inode->Unref(), -errno;
buf[(size_t) amount < bufsize ? (size_t) amount : bufsize - 1] = '\0';
inode->Unref();
return 0;
}
int fat_fuse_mknod(const char* path, mode_t mode, dev_t dev)
{
(void) path;
(void) mode;
(void) dev;
return -(errno = ENOSYS);
}
int fat_fuse_mkdir(const char* path, mode_t mode)
{
Inode* inode = fat_fuse_parent_dir(&path);
if ( !inode )
return -errno;
Inode* newdir = inode->CreateDirectory(path, ExtModeFromHostMode(mode));
inode->Unref();
if ( !newdir )
return -errno;
newdir->Unref();
return 0;
}
int fat_fuse_unlink(const char* path)
{
Inode* inode = fat_fuse_parent_dir(&path);
if ( !inode )
return -errno;
bool success = inode->Unlink(path, false);
inode->Unref();
return success ? 0 : -errno;
}
int fat_fuse_rmdir(const char* path)
{
Inode* inode = fat_fuse_parent_dir(&path);
if ( !inode )
return -errno;
bool success = inode->RemoveDirectory(path);
inode->Unref();
return success ? 0 : -errno;
}
int fat_fuse_symlink(const char* oldname, const char* newname)
{
Inode* newdir = fat_fuse_parent_dir(&newname);
if ( !newdir )
return -errno;
bool success = newdir->Symlink(newname, oldname);
newdir->Unref();
return success ? 0 : -errno;
}
int fat_fuse_rename(const char* oldname, const char* newname)
{
Inode* olddir = fat_fuse_parent_dir(&oldname);
if ( !olddir )
return -errno;
Inode* newdir = fat_fuse_parent_dir(&newname);
if ( !newdir )
return olddir->Unref(), -errno;
bool success = newdir->Rename(olddir, oldname, newname);
newdir->Unref();
olddir->Unref();
return success ? 0 : -errno;
}
int fat_fuse_link(const char* oldname, const char* newname)
{
Inode* inode = fat_fuse_resolve_path(oldname);
if ( !inode )
return -errno;
Inode* newdir = fat_fuse_parent_dir(&newname);
if ( !newdir )
return inode->Unref(), -errno;
bool success = inode->Link(newname, inode, false);
newdir->Unref();
inode->Unref();
return success ? 0 : -errno;
}
int fat_fuse_chmod(const char* path, mode_t mode)
{
Inode* inode = fat_fuse_resolve_path(path);
if ( !inode )
return -errno;
if ( !FUSE_FS->device->write )
return inode->Unref(), -(errno = EROFS);
uint32_t req_mode = ExtModeFromHostMode(mode);
uint32_t old_mode = inode->Mode();
uint32_t new_mode = (old_mode & ~S_SETABLE) | (req_mode & S_SETABLE);
inode->SetMode(new_mode);
inode->Unref();
return 0;
}
int fat_fuse_chown(const char* path, uid_t owner, gid_t group)
{
Inode* inode = fat_fuse_resolve_path(path);
if ( !inode )
return -errno;
if ( !FUSE_FS->device->write )
return inode->Unref(), -(errno = EROFS);
inode->SetUserId((uint32_t) owner);
inode->SetGroupId((uint32_t) group);
inode->Unref();
return 0;
}
int fat_fuse_truncate(const char* path, off_t size)
{
Inode* inode = fat_fuse_resolve_path(path);
if ( !inode )
return -errno;
if ( !FUSE_FS->device->write )
return inode->Unref(), -(errno = EROFS);
inode->Truncate((uint64_t) size);
inode->Unref();
return 0;
}
int fat_fuse_ftruncate(const char* /*path*/, off_t size,
struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
if ( !FUSE_FS->device->write )
return inode->Unref(), -(errno = EROFS);
inode->Truncate((uint64_t) size);
inode->Unref();
return 0;
}
int fat_fuse_open(const char* path, struct fuse_file_info* fi)
{
int flags = fi->flags;
Inode* dir = fat_fuse_parent_dir(&path);
if ( !dir )
return -errno;
Inode* result = dir->Open(path, flags, 0);
dir->Unref();
if ( !result )
return -errno;
fi->fh = (uint64_t) result->inode_id;
fi->keep_cache = 1;
result->RemoteRefer();
result->Unref();
return 0;
}
int fat_fuse_access(const char* path, int mode)
{
Inode* dir = fat_fuse_parent_dir(&path);
if ( !dir )
return -errno;
Inode* result = dir->Open(path, O_RDONLY, 0);
dir->Unref();
if ( !result )
return -errno;
(void) mode;
result->Unref();
return 0;
}
int fat_fuse_create(const char* path, mode_t mode, struct fuse_file_info* fi)
{
int flags = fi->flags | O_CREAT;
Inode* inode = fat_fuse_parent_dir(&path);
if ( !inode )
return -errno;
Inode* result = inode->Open(path, flags, ExtModeFromHostMode(mode));
inode->Unref();
if ( !result )
return -errno;
fi->fh = (uint64_t) result->inode_id;
fi->keep_cache = 1;
result->RemoteRefer();
result->Unref();
return 0;
}
int fat_fuse_opendir(const char* path, struct fuse_file_info* fi)
{
return fat_fuse_open(path, fi);
}
int fat_fuse_read(const char* /*path*/, char* buf, size_t count, off_t offset,
struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
if ( INT_MAX < count )
count = INT_MAX;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
ssize_t result = inode->ReadAt((uint8_t*) buf, count, offset);
inode->Unref();
return 0 <= result ? (int) result : -errno;
}
int fat_fuse_write(const char* /*path*/, const char* buf, size_t count,
off_t offset, struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
if ( INT_MAX < count )
count = INT_MAX;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
ssize_t result = inode->WriteAt((const uint8_t*) buf, count, offset);
inode->Unref();
return 0 <= result ? (int) result : -errno;
}
int fat_fuse_statfs(const char* /*path*/, struct statvfs* stvfs)
{
memset(stvfs, 0, sizeof(*stvfs));
Filesystem* fs = FUSE_FS;
stvfs->f_bsize = fs->block_size;
stvfs->f_frsize = fs->block_size;
stvfs->f_blocks = fs->num_blocks;
stvfs->f_bfree = fs->sb->s_free_blocks_count;
stvfs->f_bavail = fs->sb->s_free_blocks_count;
stvfs->f_files = fs->num_inodes;
stvfs->f_ffree = fs->sb->s_free_inodes_count;
stvfs->f_favail = fs->sb->s_free_inodes_count;
stvfs->f_ffree = fs->sb->s_free_inodes_count;
stvfs->f_fsid = 0;
stvfs->f_flag = 0;
if ( !fs->device->write )
stvfs->f_flag |= ST_RDONLY;
stvfs->f_namemax = 255;
return 0;
}
int fat_fuse_flush(const char* /*path*/, struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
inode->Sync();
inode->Unref();
return 0;
}
int fat_fuse_release(const char* /*path*/, struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
inode->RemoteUnref();
inode->Unref();
return 0;
}
int fat_fuse_releasedir(const char* path, struct fuse_file_info* fi)
{
return fat_fuse_release(path, fi);
}
int fat_fuse_fsync(const char* /*path*/, int data, struct fuse_file_info* fi)
{
(void) data;
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
inode->Sync();
inode->Unref();
return 0;
}
/*int fat_fuse_syncdir(const char* path, int data, struct fuse_file_info* fi)
{
return fat_fuse_sync(path, data, fi);
}*/
/*int fat_fuse_setxattr(const char *, const char *, const char *, size_t, int)
{
return -(errno = ENOSYS);
}*/
/*int fat_fuse_getxattr(const char *, const char *, char *, size_t)
{
return -(errno = ENOSYS);
}*/
/*int fat_fuse_listxattr(const char *, char *, size_t)
{
return -(errno = ENOSYS);
}*/
/*int fat_fuse_removexattr(const char *, const char *)
{
return -(errno = ENOSYS);
}*/
int fat_fuse_readdir(const char* /*path*/, void* buf, fuse_fill_dir_t filler,
off_t rec_num, struct fuse_file_info* fi)
{
Filesystem* fs = FUSE_FS;
Inode* inode = fs->GetInode((uint32_t) fi->fh);
if ( !inode )
return -errno;
if ( !S_ISDIR(inode->Mode()) )
return inode->Unref(), -(errno = ENOTDIR);
uint64_t file_size = inode->Size();
uint64_t offset = 0;
Block* block = NULL;
uint64_t block_id = 0;
while ( offset < file_size )
{
uint64_t entry_block_id = offset / fs->block_size;
uint64_t entry_block_offset = offset % fs->block_size;
if ( block && block_id != entry_block_id )
block->Unref(),
block = NULL;
if ( !block && !(block = inode->GetBlock(block_id = entry_block_id)) )
return inode->Unref(), -errno;
const uint8_t* block_data = block->block_data + entry_block_offset;
const struct ext_dirent* entry = (const struct ext_dirent*) block_data;
if ( entry->inode && entry->name_len && (!rec_num || !rec_num--) )
{
char* entry_name = strndup(entry->name, entry->name_len);
if ( !entry_name )
return block->Unref(), inode->Unref(), -errno;
memcpy(entry_name, entry->name, entry->name_len);
bool full = filler(buf, entry_name, NULL, 0);
free(entry_name);
if ( full )
{
block->Unref();
inode->Unref();
return 0;
}
}
offset += entry->reclen;
}
if ( block )
block->Unref();
inode->Unref();
return 0;
}
/*int fat_fuse_lock(const char*, struct fuse_file_info*, int, struct flock*)
{
return -(errno = ENOSYS);
}*/
int fat_fuse_utimens(const char* path, const struct timespec tv[2])
{
Inode* inode = fat_fuse_resolve_path(path);
if ( !inode )
return -errno;
if ( !FUSE_FS->device->write )
return inode->Unref(), -(errno = EROFS);
inode->BeginWrite();
inode->data->i_atime = tv[0].tv_sec;
inode->data->i_mtime = tv[1].tv_sec;
inode->FinishWrite();
inode->Unref();
return 0;
}
/*int fat_fuse_bmap(const char*, size_t blocksize, uint64_t* idx)
{
return -(errno = ENOSYS);
}*/
int fat_fuse_main(const char* argv0,
const char* mount_path,
bool foreground,
Filesystem* fs,
Device* dev)
{
struct fuse_operations operations;
memset(&operations, 0, sizeof(operations));
operations.access = fat_fuse_access;
operations.chmod = fat_fuse_chmod;
operations.chown = fat_fuse_chown;
operations.create = fat_fuse_create;
operations.destroy = fat_fuse_destroy;
operations.fgetattr = fat_fuse_fgetattr;
operations.flush = fat_fuse_flush;
operations.fsync = fat_fuse_fsync;
operations.ftruncate = fat_fuse_ftruncate;
operations.getattr = fat_fuse_getattr;
operations.init = fat_fuse_init;
operations.link = fat_fuse_link;
operations.mkdir = fat_fuse_mkdir;
operations.mknod = fat_fuse_mknod;
operations.opendir = fat_fuse_opendir;
operations.open = fat_fuse_open;
operations.readdir = fat_fuse_readdir;
operations.read = fat_fuse_read;
operations.readlink = fat_fuse_readlink;
operations.releasedir = fat_fuse_releasedir;
operations.release = fat_fuse_release;
operations.rename = fat_fuse_rename;
operations.rmdir = fat_fuse_rmdir;
operations.statfs = fat_fuse_statfs;
operations.symlink = fat_fuse_symlink;
operations.truncate = fat_fuse_truncate;
operations.unlink = fat_fuse_unlink;
operations.utimens = fat_fuse_utimens;
operations.write = fat_fuse_write;
operations.flag_nullpath_ok = 1;
operations.flag_nopath = 1;
char* argv_fuse[] =
{
(char*) argv0,
(char*) "-s",
(char*) mount_path,
(char*) NULL,
};
int argc_fuse = sizeof(argv_fuse) / sizeof(argv_fuse[0]) - 1;
struct fat_fuse_ctx fat_fuse_ctx;
fat_fuse_ctx.fs = fs;
fat_fuse_ctx.dev = dev;
(void) foreground;
return fuse_main(argc_fuse, argv_fuse, &operations, &fat_fuse_ctx);
}
#endif

32
fat/fuse.h Normal file
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@ -0,0 +1,32 @@
/*
* Copyright (c) 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fuse.h
* FUSE frontend.
*/
#ifndef FUSE_H
#define FUSE_H
class Device;
class Filesystem;
int fat_fuse_main(const char* argv0,
const char* mount_path,
bool foreground,
Filesystem* fs,
Device* dev);
#endif

1015
fat/inode.cpp Normal file
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File diff suppressed because it is too large Load Diff

90
fat/inode.h Normal file
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@ -0,0 +1,90 @@
/*
* Copyright (c) 2013, 2014, 2015, 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* inode.h
* Filesystem inode.
*/
#ifndef INODE_H
#define INODE_H
class Block;
class Filesystem;
class Inode
{
public:
Inode(Filesystem* filesystem, uint32_t inode_id);
~Inode();
public:
Inode* prev_inode;
Inode* next_inode;
Inode* prev_hashed;
Inode* next_hashed;
Inode* prev_dirty;
Inode* next_dirty;
Block* data_block;
struct fat_dirent* dirent;
struct fat_dirent deleted_dirent;
uint32_t first_cluster;
Filesystem* filesystem;
size_t reference_count;
size_t remote_reference_count;
size_t implied_reference;
uint32_t inode_id;
bool dirty;
bool deleted;
public:
uint32_t Mode();
uint32_t UserId();
uint32_t GroupId();
uint64_t Size();
void UTimens(const struct timespec times[2]);
bool ChangeMode(mode_t mode);
bool ChangeOwner(uid_t uid, gid_t gid);
bool Truncate(uint64_t new_size);
Block* GetClusterSector(uint32_t cluster, uint8_t sector);
bool Iterate(Block** block_ptr, uint32_t* cluster_ptr,
uint8_t* sector_ptr, uint16_t* offset);
uint32_t SeekCluster(uint32_t cluster_id);
Inode* Open(const char* elem, int flags, mode_t mode);
bool Link(const char* elem, Inode* dest, bool directories);
bool Symlink(const char* elem, const char* dest);
bool Unlink(const char* elem, bool directories, bool force=false);
Inode* UnlinkKeep(const char* elem, bool directories, bool force=false);
ssize_t ReadAt(uint8_t* buffer, size_t count, off_t offset);
ssize_t WriteAt(const uint8_t* buffer, size_t count, off_t offset);
bool Rename(Inode* olddir, const char* oldname, const char* newname);
Inode* CreateDirectory(const char* path, mode_t mode);
bool RemoveDirectory(const char* path);
bool IsEmptyDirectory();
void Refer();
void Unref();
void RemoteRefer();
void RemoteUnref();
void Sync();
void BeginWrite();
void FinishWrite();
void Modified();
void Use();
void Unlink();
void Prelink();
void Delete();
};
#endif

150
fat/ioleast.h Normal file
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@ -0,0 +1,150 @@
/*
* Copyright (c) 2012, 2013, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ioleast.h
* Versions of {,p}{read,write} that don't return until it has returned as much
* data as requested, end of file, or an error occurs. This is sometimes needed
* as read(2) and write(2) is not always guaranteed to fill up the entire
* buffer or write it all.
*/
#ifndef SORTIX_COMPATIBILITY_INCLUDE_IOLEAST_H
#define SORTIX_COMPATIBILITY_INCLUDE_IOLEAST_H
#if defined(__sortix__) || defined(__sortix_libc__)
#include_next <ioleast.h>
#else
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <unistd.h>
#if !defined(EEOF) && defined(EIO)
#define EEOF EIO
#endif
__attribute__((unused)) static inline
size_t readleast(int fd, void* buf_ptr, size_t least, size_t max)
{
assert(least <= max);
unsigned char* buf = (unsigned char*) buf_ptr;
size_t done = 0;
do
{
ssize_t amount = read(fd, buf + done, max - done);
if ( amount < 0 )
return done;
if ( !amount && done < least )
return errno = EEOF, done;
if ( !amount )
break;
done += amount;
} while ( done < least );
return done;
}
__attribute__((unused)) static inline
size_t writeleast(int fd, const void* buf_ptr, size_t least, size_t max)
{
assert(least <= max);
const unsigned char* buf = (const unsigned char*) buf_ptr;
size_t done = 0;
do
{
ssize_t amount = write(fd, buf + done, max - done);
if ( amount < 0 )
return done;
if ( !amount && done < least )
return errno = EEOF, done;
if ( !amount )
break;
done += amount;
} while ( done < least );
return done;
}
__attribute__((unused)) static inline
size_t preadleast(int fd, void* buf_ptr, size_t least, size_t max, off_t off)
{
assert(least <= max);
unsigned char* buf = (unsigned char*) buf_ptr;
size_t done = 0;
do
{
ssize_t amount = pread(fd, buf + done, max - done, off + done);
if ( amount < 0 )
return done;
if ( !amount && done < least )
return errno = EEOF, done;
if ( !amount )
break;
done += amount;
} while ( done < least );
return done;
}
__attribute__((unused)) static inline
size_t pwriteleast(int fd, const void* buf_ptr, size_t least, size_t max, off_t off)
{
assert(least <= max);
const unsigned char* buf = (const unsigned char*) buf_ptr;
size_t done = 0;
do
{
ssize_t amount = pwrite(fd, buf + done, max - done, off + done);
if ( amount < 0 )
return done;
if ( !amount && done < least )
return errno = EEOF, done;
if ( !amount )
break;
done += amount;
} while ( done < least );
return done;
}
__attribute__((unused)) static inline
size_t readall(int fd, void* buf, size_t count)
{
return readleast(fd, buf, count, count);
}
__attribute__((unused)) static inline
size_t writeall(int fd, const void* buf, size_t count)
{
return writeleast(fd, buf, count, count);
}
__attribute__((unused)) static inline
size_t preadall(int fd, void* buf, size_t count, off_t off)
{
return preadleast(fd, buf, count, count, off);
}
__attribute__((unused)) static inline
size_t pwriteall(int fd, const void* buf, size_t count, off_t off)
{
return pwriteleast(fd, buf, count, count, off);
}
#endif
#endif

49
fat/util.h Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (c) 2013, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* util.h
* Utility functions for the filesystem implementation.
*/
#ifndef UTIL_H
#define UTIL_H
template <class T> T divup(T a, T b)
{
return a/b + (a % b ? 1 : 0);
}
template <class T> T roundup(T a, T b)
{
return a % b ? a + b - a % b : a;
}
static inline bool checkbit(const uint8_t* bitmap, size_t bit)
{
uint8_t bits = bitmap[bit / 8UL];
return bits & (1U << (bit % 8UL));
}
static inline void setbit(uint8_t* bitmap, size_t bit)
{
bitmap[bit / 8UL] |= 1U << (bit % 8UL);
}
static inline void clearbit(uint8_t* bitmap, size_t bit)
{
bitmap[bit / 8UL] &= ~(1U << (bit % 8UL));
}
#endif

4
init/init.c
View File

@ -3101,7 +3101,9 @@ static bool fsck(struct filesystem* fs)
if ( pid == 0 )
{
uninstall_signal_handler();
execlp(fs->fsck, fs->fsck, "-fp", "--", bdev_path, (const char*) NULL);
// TODO: Move to libmount abstraction.
const char* options = !strcmp(fs->fstype_name, "ext2") ? "-fp" : "-p";
execlp(fs->fsck, fs->fsck, options, "--", bdev_path, (const char*) NULL);
warning("%s: Failed to load filesystem checker: %s: %m",
bdev_path, fs->fsck);
_exit(127);

1
libmount/Makefile
View File

@ -17,6 +17,7 @@ devices.o \
crc32.o \
ext2.o \
extended.o \
fat.o \
filesystem.o \
gpt.o \
harddisk.o \

1
libmount/ext2.c
View File

@ -99,6 +99,7 @@ static bool ext2_probe(struct blockdevice* bdev,
const unsigned char* leading,
size_t amount)
{
// TODO: Strongly prefer a UUID indication before probing.
(void) bdev;
if ( amount < 1024 )
return false;

123
libmount/fat.c Normal file
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@ -0,0 +1,123 @@
/*
* Copyright (c) 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* fat.c
* File Allocation Table filesystem.
*/
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <mount/blockdevice.h>
#include <mount/fat.h>
#include <mount/filesystem.h>
#include <mount/partition.h>
#include <mount/uuid.h>
#include "util.h"
static size_t fat_probe_amount(struct blockdevice* bdev)
{
(void) bdev;
return 512;
}
static bool fat_probe(struct blockdevice* bdev,
const unsigned char* leading,
size_t amount)
{
(void) leading;
(void) amount;
// TODO: Relax restriction that this must be a partition? At least for non-EFI.
struct partition* p = bdev->p;
// TODO: Test for a space padded FAT32 at 0x52 + 8 bytes.
if ( p && p->table_type == PARTITION_TABLE_TYPE_GPT )
{
unsigned char bdp_uuid[16];
uuid_from_string(bdp_uuid, BDP_GPT_TYPE_UUID);
unsigned char esp_uuid[16];
uuid_from_string(esp_uuid, ESP_GPT_TYPE_UUID);
// TODO: Additional probing is needed to detect FAT vs NTFS.
return memcmp(p->gpt_type_guid, bdp_uuid, 16) == 0 ||
memcmp(p->gpt_type_guid, esp_uuid, 16) == 0;
}
else if ( p && p->table_type == PARTITION_TABLE_TYPE_MBR )
return p->mbr_system_id == 0x01 ||
p->mbr_system_id == 0x04 ||
p->mbr_system_id == 0x06 ||
p->mbr_system_id == 0x04 ||
p->mbr_system_id == 0x0C ||
p->mbr_system_id == 0x0E ||
p->mbr_system_id == 0xEF;
return false;
}
static bool fat_is_esp(struct blockdevice* bdev)
{
struct partition* p = bdev->p;
if ( p->table_type == PARTITION_TABLE_TYPE_GPT )
{
unsigned char esp_uuid[16];
uuid_from_string(esp_uuid, ESP_GPT_TYPE_UUID);
return memcmp(p->gpt_type_guid, esp_uuid, 16) == 0;
}
else if ( p->table_type == PARTITION_TABLE_TYPE_MBR )
return p->mbr_system_id == 0xEF;
return false;
}
static void fat_release(struct filesystem* fs)
{
if ( !fs )
return;
free(fs);
}
static enum filesystem_error fat_inspect(struct filesystem** fs_ptr,
struct blockdevice* bdev)
{
*fs_ptr = NULL;
struct filesystem* fs = CALLOC_TYPE(struct filesystem);
if ( !fs )
return FILESYSTEM_ERROR_ERRNO;
fs->bdev = bdev;
fs->handler = &fat_handler;
fs->handler_private = NULL;
unsigned char vbr[512];
if ( blockdevice_preadall(bdev, vbr, sizeof(vbr), 0) != sizeof(vbr) )
return fat_release(fs), FILESYSTEM_ERROR_ERRNO;
fs->fstype_name = fat_is_esp(fs->bdev) ? "efi": "fat";
fs->fsck = "fsck.fat";
fs->driver = "fatfs";
fs->flags |= FILESYSTEM_FLAG_UUID;
// Use the serial number + label as the UUID.
// TODO: The location varies between FAT12/16 and FAT32. This is the wrong
// way to detect the FAT type.
if ( vbr[82 + 3] == '3' && vbr[82 + 4] == '2' )
memcpy(fs->uuid, vbr + 67, 4 + 11);
else
memcpy(fs->uuid, vbr + 39, 4 + 11);
return *fs_ptr = fs, FILESYSTEM_ERROR_NONE;
}
const struct filesystem_handler fat_handler =
{
.handler_name = "fat",
.probe_amount = fat_probe_amount,
.probe = fat_probe,
.inspect = fat_inspect,
.release = fat_release,
};

2
libmount/filesystem.c
View File

@ -31,6 +31,7 @@
#include <mount/blockdevice.h>
#include <mount/ext2.h>
#include <mount/extended.h>
#include <mount/fat.h>
#include <mount/filesystem.h>
#include <mount/iso9660.h>
#include <mount/partition.h>
@ -57,6 +58,7 @@ static const struct filesystem_handler* filesystem_handlers[] =
&extended_handler,
&ext2_handler,
&iso9660_handler,
&fat_handler,
NULL,
};

38
libmount/include/mount/fat.h Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (c) 2023 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* mount/fat.h
* File Allocation Table filesystem.
*/
#ifndef INCLUDE_MOUNT_FAT_H
#define INCLUDE_MOUNT_FAT_H
#include <mount/filesystem.h>
#define BDP_GPT_TYPE_UUID "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7"
#define ESP_GPT_TYPE_UUID "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
#if defined(__cplusplus)
extern "C" {
#endif
extern const struct filesystem_handler fat_handler;
#if defined(__cplusplus)
} /* extern "C" */
#endif
#endif