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Compare Revisions

• This comparison shows the changes necessary to convert path

  → /branches/network/uspace/srv/fs/ @ 4152

  → /branches/network/uspace/srv/fs/ @ 4153

  ↔ Reverse comparison

• Compare Path:	Rev

  With Path:	Rev

Ignore whitespace Rev 4152 → Rev 4153

/branches/network/uspace/srv/fs/tmpfs/tmpfs_dump.c
38,17 → 38,12
#include "tmpfs.h"
#include "../../vfs/vfs.h"
#include <ipc/ipc.h>
#include <async.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <as.h>
#include <libfs.h>
#include <ipc/services.h>
#include <ipc/devmap.h>
#include <sys/mman.h>
#include <libblock.h>
#include <byteorder.h>
#define TMPFS_BLOCK_SIZE 1024
59,11 → 54,12
} __attribute__((packed));
static bool
tmpfs_restore_recursion(int phone, void *block, off_t *bufpos, size_t *buflen,
off_t *pos, tmpfs_dentry_t *parent)
tmpfs_restore_recursion(int dev, off_t *bufpos, size_t *buflen, off_t *pos,
tmpfs_dentry_t *parent)
{
struct rdentry entry;
libfs_ops_t *ops = &tmpfs_libfs_ops;
int rc;
do {
char *fname;
70,8 → 66,8
tmpfs_dentry_t *node;
uint32_t size;
if (!libfs_blockread(phone, block, bufpos, buflen, pos, &entry,
sizeof(entry), TMPFS_BLOCK_SIZE))
if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
TMPFS_BLOCK_SIZE) != EOK)
return false;
entry.len = uint32_t_le2host(entry.len);
84,14 → 80,14
if (fname == NULL)
return false;
node = (tmpfs_dentry_t *) ops->create(L_FILE);
node = (tmpfs_dentry_t *) ops->create(dev, L_FILE);
if (node == NULL) {
free(fname);
return false;
}
if (!libfs_blockread(phone, block, bufpos, buflen, pos,
fname, entry.len, TMPFS_BLOCK_SIZE)) {
if (block_read(dev, bufpos, buflen, pos, fname,
entry.len, TMPFS_BLOCK_SIZE) != EOK) {
ops->destroy((void *) node);
free(fname);
return false;
98,7 → 94,8
}
fname[entry.len] = 0;
if (!ops->link((void *) parent, (void *) node, fname)) {
rc = ops->link((void *) parent, (void *) node, fname);
if (rc != EOK) {
ops->destroy((void *) node);
free(fname);
return false;
105,8 → 102,8
}
free(fname);
if (!libfs_blockread(phone, block, bufpos, buflen, pos,
&size, sizeof(size), TMPFS_BLOCK_SIZE))
if (block_read(dev, bufpos, buflen, pos, &size,
sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
return false;
size = uint32_t_le2host(size);
116,8 → 113,8
return false;
node->size = size;
if (!libfs_blockread(phone, block, bufpos, buflen, pos,
node->data, size, TMPFS_BLOCK_SIZE))
if (block_read(dev, bufpos, buflen, pos, node->data,
size, TMPFS_BLOCK_SIZE) != EOK)
return false;
break;
126,21 → 123,22
if (fname == NULL)
return false;
node = (tmpfs_dentry_t *) ops->create(L_DIRECTORY);
node = (tmpfs_dentry_t *) ops->create(dev, L_DIRECTORY);
if (node == NULL) {
free(fname);
return false;
}
if (!libfs_blockread(phone, block, bufpos, buflen, pos,
fname, entry.len, TMPFS_BLOCK_SIZE)) {
if (block_read(dev, bufpos, buflen, pos, fname,
entry.len, TMPFS_BLOCK_SIZE) != EOK) {
ops->destroy((void *) node);
free(fname);
return false;
}
fname[entry.len] = 0;
if (!ops->link((void *) parent, (void *) node, fname)) {
rc = ops->link((void *) parent, (void *) node, fname);
if (rc != EOK) {
ops->destroy((void *) node);
free(fname);
return false;
147,8 → 145,8
}
free(fname);
if (!tmpfs_restore_recursion(phone, block, bufpos,
buflen, pos, node))
if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
node))
return false;
break;
163,32 → 161,19
bool tmpfs_restore(dev_handle_t dev)
{
libfs_ops_t *ops = &tmpfs_libfs_ops;
int rc;
void *block = mmap(NULL, TMPFS_BLOCK_SIZE,
PROTO_READ | PROTO_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
rc = block_init(dev, TMPFS_BLOCK_SIZE);
if (rc != EOK)
return false;
if (block == NULL)
return false;
int phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
DEVMAP_CONNECT_TO_DEVICE, dev);
if (phone < 0) {
munmap(block, TMPFS_BLOCK_SIZE);
return false;
}
if (ipc_share_out_start(phone, block, AS_AREA_READ | AS_AREA_WRITE) !=
EOK)
goto error;
off_t bufpos = 0;
size_t buflen = 0;
off_t pos = 0;
char tag[6];
if (!libfs_blockread(phone, block, &bufpos, &buflen, &pos, tag, 5,
TMPFS_BLOCK_SIZE))
if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
TMPFS_BLOCK_SIZE) != EOK)
goto error;
tag[5] = 0;
195,17 → 180,15
if (strcmp(tag, "TMPFS") != 0)
goto error;
if (!tmpfs_restore_recursion(phone, block, &bufpos, &buflen, &pos,
if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
ops->root_get(dev)))
goto error;
ipc_hangup(phone);
munmap(block, TMPFS_BLOCK_SIZE);
block_fini(dev);
return true;
error:
ipc_hangup(phone);
munmap(block, TMPFS_BLOCK_SIZE);
block_fini(dev);
return false;
}

/branches/network/uspace/srv/fs/tmpfs/tmpfs.c
55,16 → 55,6
vfs_info_t tmpfs_vfs_info = {
.name = "tmpfs",
.ops = {
[IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_TRUNCATE)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_MOUNTED)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_NULL,
[IPC_METHOD_TO_VFS_OP(VFS_DESTROY)] = VFS_OP_DEFINED,
}
};
fs_reg_t tmpfs_reg;
136,18 → 126,15
int main(int argc, char **argv)
{
int vfs_phone;
printf(NAME ": HelenOS TMPFS file system server\n");
vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
while (vfs_phone < EOK) {
usleep(10000);
vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
int vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
if (vfs_phone < EOK) {
printf(NAME ": Unable to connect to VFS\n");
return -1;
}
int rc;
rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info,
int rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info,
tmpfs_connection);
if (rc != EOK) {
printf(NAME ": Failed to register file system (%d)\n", rc);

/branches/network/uspace/srv/fs/tmpfs/tmpfs_ops.c
64,6 → 64,8
*/
static tmpfs_dentry_t *root;
#define TMPFS_DEV 0 /**< Dummy device handle for TMPFS */
/*
* Implementation of the libfs interface.
*/
72,8 → 74,8
static void *tmpfs_match(void *, const char *);
static void *tmpfs_node_get(dev_handle_t, fs_index_t);
static void tmpfs_node_put(void *);
static void *tmpfs_create_node(int);
static bool tmpfs_link_node(void *, void *, const char *);
static void *tmpfs_create_node(dev_handle_t, int);
static int tmpfs_link_node(void *, void *, const char *);
static int tmpfs_unlink_node(void *, void *);
static int tmpfs_destroy_node(void *);
228,7 → 230,7
{
if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 1, &dentries_ops))
return false;
root = (tmpfs_dentry_t *) tmpfs_create_node(L_DIRECTORY);
root = (tmpfs_dentry_t *) tmpfs_create_node(TMPFS_DEV, L_DIRECTORY);
if (!root) {
hash_table_destroy(&dentries);
return false;
282,7 → 284,7
/* nothing to do */
}
void *tmpfs_create_node(int lflag)
void *tmpfs_create_node(dev_handle_t dev_handle, int lflag)
{
assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
306,7 → 308,7
return (void *) node;
}
bool tmpfs_link_node(void *prnt, void *chld, const char *nm)
int tmpfs_link_node(void *prnt, void *chld, const char *nm)
{
tmpfs_dentry_t *parentp = (tmpfs_dentry_t *) prnt;
tmpfs_dentry_t *childp = (tmpfs_dentry_t *) chld;
315,13 → 317,13
tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));
if (!namep)
return false;
return ENOMEM;
tmpfs_name_initialize(namep);
size_t len = strlen(nm);
namep->name = malloc(len + 1);
if (!namep->name) {
free(namep);
return false;
return ENOMEM;
}
strcpy(namep->name, nm);
namep->parent = parentp;
341,7 → 343,7
parentp->child = childp;
}
return true;
return EOK;
}
int tmpfs_unlink_node(void *prnt, void *chld)

/branches/network/uspace/srv/fs/tmpfs/Makefile
31,12 → 31,17
LIBC_PREFIX = ../../../lib/libc
LIBFS_PREFIX = ../../../lib/libfs
LIBBLOCK_PREFIX = ../../../lib/libblock
SOFTINT_PREFIX = ../../../lib/softint
include $(LIBC_PREFIX)/Makefile.toolchain
CFLAGS += -I $(LIBFS_PREFIX)
CFLAGS += -I $(LIBFS_PREFIX) -I $(LIBBLOCK_PREFIX)
LIBS = $(LIBC_PREFIX)/libc.a $(LIBFS_PREFIX)/libfs.a
LIBS = \
$(LIBFS_PREFIX)/libfs.a \
$(LIBBLOCK_PREFIX)/libblock.a \
$(LIBC_PREFIX)/libc.a
## Sources
#
56,13 → 61,13
-include Makefile.depend
clean:
-rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend
-rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend $(OBJECTS)
depend:
$(CC) $(DEFS) $(CFLAGS) -M $(SOURCES) > Makefile.depend
$(OUTPUT): $(OBJECTS) $(LIBS)
$(LD) -T $(LIBC_PREFIX)/arch/$(ARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map
$(LD) -T $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map
disasm: $(OUTPUT).disasm

/branches/network/uspace/srv/fs/fat/fat_idx.c
214,7 → 214,7
};
/** Allocate a VFS index which is not currently in use. */
static bool fat_idx_alloc(dev_handle_t dev_handle, fs_index_t *index)
static bool fat_index_alloc(dev_handle_t dev_handle, fs_index_t *index)
{
unused_t *u;
276,7 → 276,7
}
/** Free a VFS index, which is no longer in use. */
static void fat_idx_free(dev_handle_t dev_handle, fs_index_t index)
static void fat_index_free(dev_handle_t dev_handle, fs_index_t index)
{
unused_t *u;
338,6 → 338,52
futex_up(&unused_futex);
}
static fat_idx_t *fat_idx_create(dev_handle_t dev_handle)
{
fat_idx_t *fidx;
fidx = (fat_idx_t *) malloc(sizeof(fat_idx_t));
if (!fidx)
return NULL;
if (!fat_index_alloc(dev_handle, &fidx->index)) {
free(fidx);
return NULL;
}
link_initialize(&fidx->uph_link);
link_initialize(&fidx->uih_link);
futex_initialize(&fidx->lock, 1);
fidx->dev_handle = dev_handle;
fidx->pfc = FAT_CLST_RES0; /* no parent yet */
fidx->pdi = 0;
fidx->nodep = NULL;
return fidx;
}
fat_idx_t *fat_idx_get_new(dev_handle_t dev_handle)
{
fat_idx_t *fidx;
futex_down(&used_futex);
fidx = fat_idx_create(dev_handle);
if (!fidx) {
futex_up(&used_futex);
return NULL;
}
unsigned long ikey[] = {
[UIH_DH_KEY] = dev_handle,
[UIH_INDEX_KEY] = fidx->index,
};
hash_table_insert(&ui_hash, ikey, &fidx->uih_link);
futex_down(&fidx->lock);
futex_up(&used_futex);
return fidx;
}
fat_idx_t *
fat_idx_get_by_pos(dev_handle_t dev_handle, fat_cluster_t pfc, unsigned pdi)
{
354,16 → 400,11
if (l) {
fidx = hash_table_get_instance(l, fat_idx_t, uph_link);
} else {
fidx = (fat_idx_t *) malloc(sizeof(fat_idx_t));
fidx = fat_idx_create(dev_handle);
if (!fidx) {
futex_up(&used_futex);
return NULL;
}
if (!fat_idx_alloc(dev_handle, &fidx->index)) {
free(fidx);
futex_up(&used_futex);
return NULL;
}
unsigned long ikey[] = {
[UIH_DH_KEY] = dev_handle,
370,13 → 411,8
[UIH_INDEX_KEY] = fidx->index,
};
link_initialize(&fidx->uph_link);
link_initialize(&fidx->uih_link);
futex_initialize(&fidx->lock, 1);
fidx->dev_handle = dev_handle;
fidx->pfc = pfc;
fidx->pdi = pdi;
fidx->nodep = NULL;
hash_table_insert(&up_hash, pkey, &fidx->uph_link);
hash_table_insert(&ui_hash, ikey, &fidx->uih_link);
387,6 → 423,32
return fidx;
}
void fat_idx_hashin(fat_idx_t *idx)
{
unsigned long pkey[] = {
[UPH_DH_KEY] = idx->dev_handle,
[UPH_PFC_KEY] = idx->pfc,
[UPH_PDI_KEY] = idx->pdi,
};
futex_down(&used_futex);
hash_table_insert(&up_hash, pkey, &idx->uph_link);
futex_up(&used_futex);
}
void fat_idx_hashout(fat_idx_t *idx)
{
unsigned long pkey[] = {
[UPH_DH_KEY] = idx->dev_handle,
[UPH_PFC_KEY] = idx->pfc,
[UPH_PDI_KEY] = idx->pdi,
};
futex_down(&used_futex);
hash_table_remove(&up_hash, pkey, 3);
futex_up(&used_futex);
}
fat_idx_t *
fat_idx_get_by_index(dev_handle_t dev_handle, fs_index_t index)
{
408,6 → 470,33
return fidx;
}
/** Destroy the index structure.
*
* @param idx The index structure to be destroyed.
*/
void fat_idx_destroy(fat_idx_t *idx)
{
unsigned long ikey[] = {
[UIH_DH_KEY] = idx->dev_handle,
[UIH_INDEX_KEY] = idx->index,
};
assert(idx->pfc == FAT_CLST_RES0);
futex_down(&used_futex);
/*
* Since we can only free unlinked nodes, the index structure is not
* present in the position hash (uph). We therefore hash it out from
* the index hash only.
*/
hash_table_remove(&ui_hash, ikey, 2);
futex_up(&used_futex);
/* Release the VFS index. */
fat_index_free(idx->dev_handle, idx->index);
/* Deallocate the structure. */
free(idx);
}
int fat_idx_init(void)
{
if (!hash_table_create(&up_hash, UPH_BUCKETS, 3, &uph_ops))

/branches/network/uspace/srv/fs/fat/fat.h
33,6 → 33,7
#ifndef FAT_FAT_H_
#define FAT_FAT_H_
#include "fat_fat.h"
#include <ipc/ipc.h>
#include <libfs.h>
#include <atomic.h>
44,7 → 45,12
#define dprintf(...) printf(__VA_ARGS__)
#endif
typedef struct {
#define min(a, b) ((a) < (b) ? (a) : (b))
#define BS_BLOCK 0
#define BS_SIZE 512
typedef struct fat_bs {
uint8_t ji[3]; /**< Jump instruction. */
uint8_t oem_name[8];
/* BIOS Parameter Block */
115,34 → 121,6
};
} __attribute__ ((packed)) fat_bs_t;
#define FAT_ATTR_RDONLY (1 << 0)
#define FAT_ATTR_VOLLABEL (1 << 3)
#define FAT_ATTR_SUBDIR (1 << 4)
typedef struct {
uint8_t name[8];
uint8_t ext[3];
uint8_t attr;
uint8_t reserved;
uint8_t ctime_fine;
uint16_t ctime;
uint16_t cdate;
uint16_t adate;
union {
uint16_t eaidx; /* FAT12/FAT16 */
uint16_t firstc_hi; /* FAT32 */
};
uint16_t mtime;
uint16_t mdate;
union {
uint16_t firstc; /* FAT12/FAT16 */
uint16_t firstc_lo; /* FAT32 */
};
uint32_t size;
} __attribute__ ((packed)) fat_dentry_t;
typedef uint16_t fat_cluster_t;
typedef enum {
FAT_INVALID,
FAT_DIRECTORY,
223,9 → 201,16
extern void fat_mount(ipc_callid_t, ipc_call_t *);
extern void fat_lookup(ipc_callid_t, ipc_call_t *);
extern void fat_read(ipc_callid_t, ipc_call_t *);
extern void fat_write(ipc_callid_t, ipc_call_t *);
extern void fat_truncate(ipc_callid_t, ipc_call_t *);
extern void fat_destroy(ipc_callid_t, ipc_call_t *);
extern fat_idx_t *fat_idx_get_new(dev_handle_t);
extern fat_idx_t *fat_idx_get_by_pos(dev_handle_t, fat_cluster_t, unsigned);
extern fat_idx_t *fat_idx_get_by_index(dev_handle_t, fs_index_t);
extern void fat_idx_destroy(fat_idx_t *);
extern void fat_idx_hashin(fat_idx_t *);
extern void fat_idx_hashout(fat_idx_t *);
extern int fat_idx_init(void);
extern void fat_idx_fini(void);

/branches/network/uspace/srv/fs/fat/fat_dentry.c
0,0 → 1,204
/*
* Copyright (c) 2008 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup fs
* @{
*/
/**
* @file fat_dentry.c
* @brief Functions that work with FAT directory entries.
*/
#include "fat_dentry.h"
#include <ctype.h>
#include <string.h>
static bool is_d_char(const char ch)
{
if (isalnum(ch) || ch == '_')
return true;
else
return false;
}
/** Compare path component with the name read from the dentry.
*
* This function compares the path component with the name read from the dentry.
* The comparison is case insensitive and tolerates a mismatch on the trailing
* dot character at the end of the name (i.e. when there is a dot, but no
* extension).
*
* @param name Node name read from the dentry.
* @param component Path component.
*
* @return Zero on match, non-zero otherwise.
*/
int fat_dentry_namecmp(char *name, const char *component)
{
int rc;
if (!(rc = stricmp(name, component)))
return rc;
if (!strchr(name, '.')) {
/*
* There is no '.' in the name, so we know that there is enough
* space for appending an extra '.' to name.
*/
name[strlen(name)] = '.';
name[strlen(name) + 1] = '\0';
rc = stricmp(name, component);
}
return rc;
}
bool fat_dentry_name_verify(const char *name)
{
unsigned i, dot;
bool dot_found = false;
for (i = 0; name[i]; i++) {
if (name[i] == '.') {
if (dot_found) {
return false;
} else {
dot_found = true;
dot = i;
}
} else {
if (!is_d_char(name[i]))
return false;
}
}
if (dot_found) {
if (dot > FAT_NAME_LEN)
return false;
if (i - dot > FAT_EXT_LEN + 1)
return false;
} else {
if (i > FAT_NAME_LEN)
return false;
}
return true;
}
void fat_dentry_name_get(const fat_dentry_t *d, char *buf)
{
int i;
for (i = 0; i < FAT_NAME_LEN; i++) {
if (d->name[i] == FAT_PAD)
break;
if (d->name[i] == FAT_DENTRY_E5_ESC)
*buf++ = 0xe5;
else
*buf++ = d->name[i];
}
if (d->ext[0] != FAT_PAD)
*buf++ = '.';
for (i = 0; i < FAT_EXT_LEN; i++) {
if (d->ext[i] == FAT_PAD) {
*buf = '\0';
return;
}
if (d->ext[i] == FAT_DENTRY_E5_ESC)
*buf++ = 0xe5;
else
*buf++ = d->ext[i];
}
*buf = '\0';
}
void fat_dentry_name_set(fat_dentry_t *d, const char *name)
{
int i;
const char fake_ext[] = " ";
for (i = 0; i < FAT_NAME_LEN; i++) {
switch ((uint8_t) *name) {
case 0xe5:
d->name[i] = FAT_DENTRY_E5_ESC;
name++;
break;
case '\0':
case '.':
d->name[i] = FAT_PAD;
break;
default:
d->name[i] = toupper(*name++);
break;
}
}
if (*name++ != '.')
name = fake_ext;
for (i = 0; i < FAT_EXT_LEN; i++) {
switch ((uint8_t) *name) {
case 0xe5:
d->ext[i] = FAT_DENTRY_E5_ESC;
name++;
break;
case '\0':
d->ext[i] = FAT_PAD;
break;
default:
d->ext[i] = toupper(*name++);
break;
}
}
}
fat_dentry_clsf_t fat_classify_dentry(const fat_dentry_t *d)
{
if (d->attr & FAT_ATTR_VOLLABEL) {
/* volume label entry */
return FAT_DENTRY_SKIP;
}
if (d->name[0] == FAT_DENTRY_ERASED) {
/* not-currently-used entry */
return FAT_DENTRY_FREE;
}
if (d->name[0] == FAT_DENTRY_UNUSED) {
/* never used entry */
return FAT_DENTRY_LAST;
}
if (d->name[0] == FAT_DENTRY_DOT) {
/*
* Most likely '.' or '..'.
* It cannot occur in a regular file name.
*/
return FAT_DENTRY_SKIP;
}
return FAT_DENTRY_VALID;
}
/**
* @}
*/

/branches/network/uspace/srv/fs/fat/fat_dentry.h
0,0 → 1,96
/*
* Copyright (c) 2008 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup fs
* @{
*/
#ifndef FAT_FAT_DENTRY_H_
#define FAT_FAT_DENTRY_H_
#include <stdint.h>
#include <bool.h>
#define FAT_NAME_LEN 8
#define FAT_EXT_LEN 3
#define FAT_NAME_DOT ". "
#define FAT_NAME_DOT_DOT ".. "
#define FAT_EXT_PAD " "
#define FAT_ATTR_RDONLY (1 << 0)
#define FAT_ATTR_VOLLABEL (1 << 3)
#define FAT_ATTR_SUBDIR (1 << 4)
#define FAT_PAD ' '
#define FAT_DENTRY_UNUSED 0x00
#define FAT_DENTRY_E5_ESC 0x05
#define FAT_DENTRY_DOT 0x2e
#define FAT_DENTRY_ERASED 0xe5
typedef enum {
FAT_DENTRY_SKIP,
FAT_DENTRY_LAST,
FAT_DENTRY_FREE,
FAT_DENTRY_VALID
} fat_dentry_clsf_t;
typedef struct {
uint8_t name[8];
uint8_t ext[3];
uint8_t attr;
uint8_t reserved;
uint8_t ctime_fine;
uint16_t ctime;
uint16_t cdate;
uint16_t adate;
union {
uint16_t eaidx; /* FAT12/FAT16 */
uint16_t firstc_hi; /* FAT32 */
} __attribute__ ((packed));
uint16_t mtime;
uint16_t mdate;
union {
uint16_t firstc; /* FAT12/FAT16 */
uint16_t firstc_lo; /* FAT32 */
} __attribute__ ((packed));
uint32_t size;
} __attribute__ ((packed)) fat_dentry_t;
extern int fat_dentry_namecmp(char *, const char *);
extern bool fat_dentry_name_verify(const char *);
extern void fat_dentry_name_get(const fat_dentry_t *, char *);
extern void fat_dentry_name_set(fat_dentry_t *, const char *);
extern fat_dentry_clsf_t fat_classify_dentry(const fat_dentry_t *);
#endif
/**
* @}
*/

/branches/network/uspace/srv/fs/fat/fat_fat.c
0,0 → 1,454
/*
* Copyright (c) 2008 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup fs
* @{
*/
/**
* @file fat_fat.c
* @brief Functions that manipulate the File Allocation Tables.
*/
#include "fat_fat.h"
#include "fat_dentry.h"
#include "fat.h"
#include "../../vfs/vfs.h"
#include <libfs.h>
#include <libblock.h>
#include <errno.h>
#include <byteorder.h>
#include <align.h>
#include <assert.h>
#include <futex.h>
/**
* The fat_alloc_lock futex protects all copies of the File Allocation Table
* during allocation of clusters. The lock does not have to be held durring
* deallocation of clusters.
*/
static futex_t fat_alloc_lock = FUTEX_INITIALIZER;
/** Walk the cluster chain.
*
* @param bs Buffer holding the boot sector for the file.
* @param dev_handle Device handle of the device with the file.
* @param firstc First cluster to start the walk with.
* @param lastc If non-NULL, output argument hodling the last cluster number visited.
* @param max_clusters Maximum number of clusters to visit.
*
* @return Number of clusters seen during the walk.
*/
uint16_t
fat_cluster_walk(fat_bs_t *bs, dev_handle_t dev_handle, fat_cluster_t firstc,
fat_cluster_t *lastc, uint16_t max_clusters)
{
block_t *b;
unsigned bps;
unsigned rscnt; /* block address of the first FAT */
uint16_t clusters = 0;
fat_cluster_t clst = firstc;
bps = uint16_t_le2host(bs->bps);
rscnt = uint16_t_le2host(bs->rscnt);
if (firstc == FAT_CLST_RES0) {
/* No space allocated to the file. */
if (lastc)
*lastc = firstc;
return 0;
}
while (clst < FAT_CLST_LAST1 && clusters < max_clusters) {
bn_t fsec; /* sector offset relative to FAT1 */
unsigned fidx; /* FAT1 entry index */
assert(clst >= FAT_CLST_FIRST);
if (lastc)
*lastc = clst; /* remember the last cluster number */
fsec = (clst * sizeof(fat_cluster_t)) / bps;
fidx = clst % (bps / sizeof(fat_cluster_t));
/* read FAT1 */
b = block_get(dev_handle, rscnt + fsec, BLOCK_FLAGS_NONE);
clst = uint16_t_le2host(((fat_cluster_t *)b->data)[fidx]);
assert(clst != FAT_CLST_BAD);
block_put(b);
clusters++;
}
if (lastc && clst < FAT_CLST_LAST1)
*lastc = clst;
return clusters;
}
/** Read block from file located on a FAT file system.
*
* @param bs Buffer holding the boot sector of the file system.
* @param dev_handle Device handle of the file system.
* @param firstc First cluster used by the file. Can be zero if the file
* is empty.
* @param bn Block number.
* @param flags Flags passed to libblock.
*
* @return Block structure holding the requested block.
*/
block_t *
_fat_block_get(fat_bs_t *bs, dev_handle_t dev_handle, fat_cluster_t firstc,
bn_t bn, int flags)
{
block_t *b;
unsigned bps;
unsigned rscnt; /* block address of the first FAT */
unsigned rde;
unsigned rds; /* root directory size */
unsigned sf;
unsigned ssa; /* size of the system area */
unsigned clusters, max_clusters;
fat_cluster_t lastc;
bps = uint16_t_le2host(bs->bps);
rscnt = uint16_t_le2host(bs->rscnt);
rde = uint16_t_le2host(bs->root_ent_max);
sf = uint16_t_le2host(bs->sec_per_fat);
rds = (sizeof(fat_dentry_t) * rde) / bps;
rds += ((sizeof(fat_dentry_t) * rde) % bps != 0);
ssa = rscnt + bs->fatcnt * sf + rds;
if (firstc == FAT_CLST_ROOT) {
/* root directory special case */
assert(bn < rds);
b = block_get(dev_handle, rscnt + bs->fatcnt * sf + bn, flags);
return b;
}
max_clusters = bn / bs->spc;
clusters = fat_cluster_walk(bs, dev_handle, firstc, &lastc,
max_clusters);
assert(clusters == max_clusters);
b = block_get(dev_handle, ssa + (lastc - FAT_CLST_FIRST) * bs->spc +
bn % bs->spc, flags);
return b;
}
/** Fill the gap between EOF and a new file position.
*
* @param bs Buffer holding the boot sector for nodep.
* @param nodep FAT node with the gap.
* @param mcl First cluster in an independent cluster chain that will
* be later appended to the end of the node's own cluster
* chain. If pos is still in the last allocated cluster,
* this argument is ignored.
* @param pos Position in the last node block.
*/
void fat_fill_gap(fat_bs_t *bs, fat_node_t *nodep, fat_cluster_t mcl, off_t pos)
{
uint16_t bps;
unsigned spc;
block_t *b;
off_t o, boundary;
bps = uint16_t_le2host(bs->bps);
spc = bs->spc;
boundary = ROUND_UP(nodep->size, bps * spc);
/* zero out already allocated space */
for (o = nodep->size; o < pos && o < boundary;
o = ALIGN_DOWN(o + bps, bps)) {
int flags = (o % bps == 0) ?
BLOCK_FLAGS_NOREAD : BLOCK_FLAGS_NONE;
b = fat_block_get(bs, nodep, o / bps, flags);
memset(b->data + o % bps, 0, bps - o % bps);
b->dirty = true; /* need to sync node */
block_put(b);
}
if (o >= pos)
return;
/* zero out the initial part of the new cluster chain */
for (o = boundary; o < pos; o += bps) {
b = _fat_block_get(bs, nodep->idx->dev_handle, mcl,
(o - boundary) / bps, BLOCK_FLAGS_NOREAD);
memset(b->data, 0, min(bps, pos - o));
b->dirty = true; /* need to sync node */
block_put(b);
}
}
/** Get cluster from the first FAT.
*
* @param bs Buffer holding the boot sector for the file system.
* @param dev_handle Device handle for the file system.
* @param clst Cluster which to get.
*
* @return Value found in the cluster.
*/
fat_cluster_t
fat_get_cluster(fat_bs_t *bs, dev_handle_t dev_handle, fat_cluster_t clst)
{
block_t *b;
uint16_t bps;
uint16_t rscnt;
fat_cluster_t *cp, value;
bps = uint16_t_le2host(bs->bps);
rscnt = uint16_t_le2host(bs->rscnt);
b = block_get(dev_handle, rscnt + (clst * sizeof(fat_cluster_t)) / bps,
BLOCK_FLAGS_NONE);
cp = (fat_cluster_t *)b->data + clst % (bps / sizeof(fat_cluster_t));
value = uint16_t_le2host(*cp);
block_put(b);
return value;
}
/** Set cluster in one instance of FAT.
*
* @param bs Buffer holding the boot sector for the file system.
* @param dev_handle Device handle for the file system.
* @param fatno Number of the FAT instance where to make the change.
* @param clst Cluster which is to be set.
* @param value Value to set the cluster with.
*/
void
fat_set_cluster(fat_bs_t *bs, dev_handle_t dev_handle, unsigned fatno,
fat_cluster_t clst, fat_cluster_t value)
{
block_t *b;
uint16_t bps;
uint16_t rscnt;
uint16_t sf;
fat_cluster_t *cp;
bps = uint16_t_le2host(bs->bps);
rscnt = uint16_t_le2host(bs->rscnt);
sf = uint16_t_le2host(bs->sec_per_fat);
assert(fatno < bs->fatcnt);
b = block_get(dev_handle, rscnt + sf * fatno +
(clst * sizeof(fat_cluster_t)) / bps, BLOCK_FLAGS_NONE);
cp = (fat_cluster_t *)b->data + clst % (bps / sizeof(fat_cluster_t));
*cp = host2uint16_t_le(value);
b->dirty = true; /* need to sync block */
block_put(b);
}
/** Replay the allocatoin of clusters in all shadow instances of FAT.
*
* @param bs Buffer holding the boot sector of the file system.
* @param dev_handle Device handle of the file system.
* @param lifo Chain of allocated clusters.
* @param nclsts Number of clusters in the lifo chain.
*/
void fat_alloc_shadow_clusters(fat_bs_t *bs, dev_handle_t dev_handle,
fat_cluster_t *lifo, unsigned nclsts)
{
uint8_t fatno;
unsigned c;
for (fatno = FAT1 + 1; fatno < bs->fatcnt; fatno++) {
for (c = 0; c < nclsts; c++) {
fat_set_cluster(bs, dev_handle, fatno, lifo[c],
c == 0 ? FAT_CLST_LAST1 : lifo[c - 1]);
}
}
}
/** Allocate clusters in all copies of FAT.
*
* This function will attempt to allocate the requested number of clusters in
* all instances of the FAT. The FAT will be altered so that the allocated
* clusters form an independent chain (i.e. a chain which does not belong to any
* file yet).
*
* @param bs Buffer holding the boot sector of the file system.
* @param dev_handle Device handle of the file system.
* @param nclsts Number of clusters to allocate.
* @param mcl Output parameter where the first cluster in the chain
* will be returned.
* @param lcl Output parameter where the last cluster in the chain
* will be returned.
*
* @return EOK on success, a negative error code otherwise.
*/
int
fat_alloc_clusters(fat_bs_t *bs, dev_handle_t dev_handle, unsigned nclsts,
fat_cluster_t *mcl, fat_cluster_t *lcl)
{
uint16_t bps;
uint16_t rscnt;
uint16_t sf;
block_t *blk;
fat_cluster_t *lifo; /* stack for storing free cluster numbers */
unsigned found = 0; /* top of the free cluster number stack */
unsigned b, c, cl;
lifo = (fat_cluster_t *) malloc(nclsts * sizeof(fat_cluster_t));
if (!lifo)
return ENOMEM;
bps = uint16_t_le2host(bs->bps);
rscnt = uint16_t_le2host(bs->rscnt);
sf = uint16_t_le2host(bs->sec_per_fat);
/*
* Search FAT1 for unused clusters.
*/
futex_down(&fat_alloc_lock);
for (b = 0, cl = 0; b < sf; b++) {
blk = block_get(dev_handle, rscnt + b, BLOCK_FLAGS_NONE);
for (c = 0; c < bps / sizeof(fat_cluster_t); c++, cl++) {
fat_cluster_t *clst = (fat_cluster_t *)blk->data + c;
if (uint16_t_le2host(*clst) == FAT_CLST_RES0) {
/*
* The cluster is free. Put it into our stack
* of found clusters and mark it as non-free.
*/
lifo[found] = cl;
*clst = (found == 0) ?
host2uint16_t_le(FAT_CLST_LAST1) :
host2uint16_t_le(lifo[found - 1]);
blk->dirty = true; /* need to sync block */
if (++found == nclsts) {
/* we are almost done */
block_put(blk);
/* update the shadow copies of FAT */
fat_alloc_shadow_clusters(bs,
dev_handle, lifo, nclsts);
*mcl = lifo[found - 1];
*lcl = lifo[0];
free(lifo);
futex_up(&fat_alloc_lock);
return EOK;
}
}
}
block_put(blk);
}
futex_up(&fat_alloc_lock);
/*
* We could not find enough clusters. Now we need to free the clusters
* we have allocated so far.
*/
while (found--) {
fat_set_cluster(bs, dev_handle, FAT1, lifo[found],
FAT_CLST_RES0);
}
free(lifo);
return ENOSPC;
}
/** Free clusters forming a cluster chain in all copies of FAT.
*
* @param bs Buffer hodling the boot sector of the file system.
* @param dev_handle Device handle of the file system.
* @param firstc First cluster in the chain which is to be freed.
*/
void
fat_free_clusters(fat_bs_t *bs, dev_handle_t dev_handle, fat_cluster_t firstc)
{
unsigned fatno;
fat_cluster_t nextc;
/* Mark all clusters in the chain as free in all copies of FAT. */
while (firstc < FAT_CLST_LAST1) {
assert(firstc >= FAT_CLST_FIRST && firstc < FAT_CLST_BAD);
nextc = fat_get_cluster(bs, dev_handle, firstc);
for (fatno = FAT1; fatno < bs->fatcnt; fatno++)
fat_set_cluster(bs, dev_handle, fatno, firstc,
FAT_CLST_RES0);
firstc = nextc;
}
}
/** Append a cluster chain to the last file cluster in all FATs.
*
* @param bs Buffer holding the boot sector of the file system.
* @param nodep Node representing the file.
* @param mcl First cluster of the cluster chain to append.
*/
void fat_append_clusters(fat_bs_t *bs, fat_node_t *nodep, fat_cluster_t mcl)
{
dev_handle_t dev_handle = nodep->idx->dev_handle;
fat_cluster_t lcl;
uint8_t fatno;
if (fat_cluster_walk(bs, dev_handle, nodep->firstc, &lcl,
(uint16_t) -1) == 0) {
/* No clusters allocated to the node yet. */
nodep->firstc = mcl;
nodep->dirty = true; /* need to sync node */
return;
}
for (fatno = FAT1; fatno < bs->fatcnt; fatno++)
fat_set_cluster(bs, nodep->idx->dev_handle, fatno, lcl, mcl);
}
/** Chop off node clusters in all copies of FAT.
*
* @param bs Buffer holding the boot sector of the file system.
* @param nodep FAT node where the chopping will take place.
* @param lastc Last cluster which will remain in the node. If this
* argument is FAT_CLST_RES0, then all clusters will
* be chopped off.
*/
void fat_chop_clusters(fat_bs_t *bs, fat_node_t *nodep, fat_cluster_t lastc)
{
dev_handle_t dev_handle = nodep->idx->dev_handle;
if (lastc == FAT_CLST_RES0) {
/* The node will have zero size and no clusters allocated. */
fat_free_clusters(bs, dev_handle, nodep->firstc);
nodep->firstc = FAT_CLST_RES0;
nodep->dirty = true; /* need to sync node */
} else {
fat_cluster_t nextc;
unsigned fatno;
nextc = fat_get_cluster(bs, dev_handle, lastc);
/* Terminate the cluster chain in all copies of FAT. */
for (fatno = FAT1; fatno < bs->fatcnt; fatno++)
fat_set_cluster(bs, dev_handle, fatno, lastc, FAT_CLST_LAST1);
/* Free all following clusters. */
fat_free_clusters(bs, dev_handle, nextc);
}
}
/**
* @}
*/

/branches/network/uspace/srv/fs/fat/fat_fat.h
0,0 → 1,91
/*
* Copyright (c) 2008 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup fs
* @{
*/
#ifndef FAT_FAT_FAT_H_
#define FAT_FAT_FAT_H_
#include "../../vfs/vfs.h"
#include <stdint.h>
#include <libblock.h>
#define FAT1 0
#define FAT_CLST_RES0 0x0000
#define FAT_CLST_RES1 0x0001
#define FAT_CLST_FIRST 0x0002
#define FAT_CLST_BAD 0xfff7
#define FAT_CLST_LAST1 0xfff8
#define FAT_CLST_LAST8 0xffff
/* internally used to mark root directory's parent */
#define FAT_CLST_ROOTPAR FAT_CLST_RES0
/* internally used to mark root directory */
#define FAT_CLST_ROOT FAT_CLST_RES1
/* forward declarations */
struct block;
struct fat_node;
struct fat_bs;
typedef uint16_t fat_cluster_t;
#define fat_clusters_get(bs, dh, fc) \
fat_cluster_walk((bs), (dh), (fc), NULL, (uint16_t) -1)
extern uint16_t fat_cluster_walk(struct fat_bs *, dev_handle_t, fat_cluster_t,
fat_cluster_t *, uint16_t);
#define fat_block_get(bs, np, bn, flags) \
_fat_block_get((bs), (np)->idx->dev_handle, (np)->firstc, (bn), (flags))
extern struct block *_fat_block_get(struct fat_bs *, dev_handle_t,
fat_cluster_t, bn_t, int);
extern void fat_append_clusters(struct fat_bs *, struct fat_node *,
fat_cluster_t);
extern void fat_chop_clusters(struct fat_bs *, struct fat_node *,
fat_cluster_t);
extern int fat_alloc_clusters(struct fat_bs *, dev_handle_t, unsigned,
fat_cluster_t *, fat_cluster_t *);
extern void fat_free_clusters(struct fat_bs *, dev_handle_t, fat_cluster_t);
extern void fat_alloc_shadow_clusters(struct fat_bs *, dev_handle_t,
fat_cluster_t *, unsigned);
extern fat_cluster_t fat_get_cluster(struct fat_bs *, dev_handle_t, fat_cluster_t);
extern void fat_set_cluster(struct fat_bs *, dev_handle_t, unsigned,
fat_cluster_t, fat_cluster_t);
extern void fat_fill_gap(struct fat_bs *, struct fat_node *, fat_cluster_t,
off_t);
#endif
/**
* @}
*/

/branches/network/uspace/srv/fs/fat/fat.c
49,15 → 49,6
vfs_info_t fat_vfs_info = {
.name = "fat",
.ops = {
[IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL,
[IPC_METHOD_TO_VFS_OP(VFS_TRUNCATE)] = VFS_OP_NULL,
[IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_NULL,
[IPC_METHOD_TO_VFS_OP(VFS_MOUNTED)] = VFS_OP_DEFINED,
[IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_NULL,
}
};
fs_reg_t fat_reg;
110,6 → 101,15
case VFS_READ:
fat_read(callid, &call);
break;
case VFS_WRITE:
fat_write(callid, &call);
break;
case VFS_TRUNCATE:
fat_truncate(callid, &call);
break;
case VFS_DESTROY:
fat_destroy(callid, &call);
break;
default:
ipc_answer_0(callid, ENOTSUP);
break;
122,16 → 122,16
int vfs_phone;
int rc;
printf("FAT: HelenOS FAT file system server.\n");
printf("fat: HelenOS FAT file system server.\n");
rc = fat_idx_init();
if (rc != EOK)
goto err;
vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
while (vfs_phone < EOK) {
usleep(10000);
vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
if (vfs_phone < EOK) {
printf("fat: failed to connect to VFS\n");
return -1;
}
rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection);

/branches/network/uspace/srv/fs/fat/fat_ops.c
36,8 → 36,11
*/
#include "fat.h"
#include "fat_dentry.h"
#include "fat_fat.h"
#include "../../vfs/vfs.h"
#include <libfs.h>
#include <libblock.h>
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <ipc/devmap.h>
50,10 → 53,8
#include <assert.h>
#include <futex.h>
#include <sys/mman.h>
#include <align.h>
#define BS_BLOCK 0
#define BS_SIZE 512
/** Futex protecting the list of cached free FAT nodes. */
static futex_t ffn_futex = FUTEX_INITIALIZER;
60,216 → 61,6
/** List of cached free FAT nodes. */
static LIST_INITIALIZE(ffn_head);
#define FAT_NAME_LEN 8
#define FAT_EXT_LEN 3
#define FAT_PAD ' '
#define FAT_DENTRY_UNUSED 0x00
#define FAT_DENTRY_E5_ESC 0x05
#define FAT_DENTRY_DOT 0x2e
#define FAT_DENTRY_ERASED 0xe5
#define min(a, b) ((a) < (b) ? (a) : (b))
static void dentry_name_canonify(fat_dentry_t *d, char *buf)
{
int i;
for (i = 0; i < FAT_NAME_LEN; i++) {
if (d->name[i] == FAT_PAD)
break;
if (d->name[i] == FAT_DENTRY_E5_ESC)
*buf++ = 0xe5;
else
*buf++ = d->name[i];
}
if (d->ext[0] != FAT_PAD)
*buf++ = '.';
for (i = 0; i < FAT_EXT_LEN; i++) {
if (d->ext[i] == FAT_PAD) {
*buf = '\0';
return;
}
if (d->ext[i] == FAT_DENTRY_E5_ESC)
*buf++ = 0xe5;
else
*buf++ = d->ext[i];
}
*buf = '\0';
}
static int dev_phone = -1; /* FIXME */
static void *dev_buffer = NULL; /* FIXME */
/* TODO move somewhere else */
typedef struct {
void *data;
size_t size;
} block_t;
static block_t *block_get(dev_handle_t dev_handle, off_t offset, size_t bs)
{
/* FIXME */
block_t *b;
off_t bufpos = 0;
size_t buflen = 0;
off_t pos = offset * bs;
assert(dev_phone != -1);
assert(dev_buffer);
b = malloc(sizeof(block_t));
if (!b)
return NULL;
b->data = malloc(bs);
if (!b->data) {
free(b);
return NULL;
}
b->size = bs;
if (!libfs_blockread(dev_phone, dev_buffer, &bufpos, &buflen, &pos,
b->data, bs, bs)) {
free(b->data);
free(b);
return NULL;
}
return b;
}
static void block_put(block_t *block)
{
/* FIXME */
free(block->data);
free(block);
}
#define FAT_BS(b) ((fat_bs_t *)((b)->data))
#define FAT_CLST_RES0 0x0000
#define FAT_CLST_RES1 0x0001
#define FAT_CLST_FIRST 0x0002
#define FAT_CLST_BAD 0xfff7
#define FAT_CLST_LAST1 0xfff8
#define FAT_CLST_LAST8 0xffff
/* internally used to mark root directory's parent */
#define FAT_CLST_ROOTPAR FAT_CLST_RES0
/* internally used to mark root directory */
#define FAT_CLST_ROOT FAT_CLST_RES1
#define fat_block_get(np, off) \
_fat_block_get((np)->idx->dev_handle, (np)->firstc, (off))
static block_t *
_fat_block_get(dev_handle_t dev_handle, fat_cluster_t firstc, off_t offset)
{
block_t *bb;
block_t *b;
unsigned bps;
unsigned spc;
unsigned rscnt; /* block address of the first FAT */
unsigned fatcnt;
unsigned rde;
unsigned rds; /* root directory size */
unsigned sf;
unsigned ssa; /* size of the system area */
unsigned clusters;
fat_cluster_t clst = firstc;
unsigned i;
bb = block_get(dev_handle, BS_BLOCK, BS_SIZE);
bps = uint16_t_le2host(FAT_BS(bb)->bps);
spc = FAT_BS(bb)->spc;
rscnt = uint16_t_le2host(FAT_BS(bb)->rscnt);
fatcnt = FAT_BS(bb)->fatcnt;
rde = uint16_t_le2host(FAT_BS(bb)->root_ent_max);
sf = uint16_t_le2host(FAT_BS(bb)->sec_per_fat);
block_put(bb);
rds = (sizeof(fat_dentry_t) * rde) / bps;
rds += ((sizeof(fat_dentry_t) * rde) % bps != 0);
ssa = rscnt + fatcnt * sf + rds;
if (firstc == FAT_CLST_ROOT) {
/* root directory special case */
assert(offset < rds);
b = block_get(dev_handle, rscnt + fatcnt * sf + offset, bps);
return b;
}
clusters = offset / spc;
for (i = 0; i < clusters; i++) {
unsigned fsec; /* sector offset relative to FAT1 */
unsigned fidx; /* FAT1 entry index */
assert(clst >= FAT_CLST_FIRST && clst < FAT_CLST_BAD);
fsec = (clst * sizeof(fat_cluster_t)) / bps;
fidx = clst % (bps / sizeof(fat_cluster_t));
/* read FAT1 */
b = block_get(dev_handle, rscnt + fsec, bps);
clst = uint16_t_le2host(((fat_cluster_t *)b->data)[fidx]);
assert(clst != FAT_CLST_BAD);
assert(clst < FAT_CLST_LAST1);
block_put(b);
}
b = block_get(dev_handle, ssa + (clst - FAT_CLST_FIRST) * spc +
offset % spc, bps);
return b;
}
/** Return number of blocks allocated to a file.
*
* @param dev_handle Device handle of the device with the file.
* @param firstc First cluster of the file.
*
* @return Number of blocks allocated to the file.
*/
static uint16_t
_fat_blcks_get(dev_handle_t dev_handle, fat_cluster_t firstc)
{
block_t *bb;
block_t *b;
unsigned bps;
unsigned spc;
unsigned rscnt; /* block address of the first FAT */
unsigned clusters = 0;
fat_cluster_t clst = firstc;
bb = block_get(dev_handle, BS_BLOCK, BS_SIZE);
bps = uint16_t_le2host(FAT_BS(bb)->bps);
spc = FAT_BS(bb)->spc;
rscnt = uint16_t_le2host(FAT_BS(bb)->rscnt);
block_put(bb);
if (firstc == FAT_CLST_RES0) {
/* No space allocated to the file. */
return 0;
}
while (clst < FAT_CLST_LAST1) {
unsigned fsec; /* sector offset relative to FAT1 */
unsigned fidx; /* FAT1 entry index */
assert(clst >= FAT_CLST_FIRST);
fsec = (clst * sizeof(fat_cluster_t)) / bps;
fidx = clst % (bps / sizeof(fat_cluster_t));
/* read FAT1 */
b = block_get(dev_handle, rscnt + fsec, bps);
clst = uint16_t_le2host(((fat_cluster_t *)b->data)[fidx]);
assert(clst != FAT_CLST_BAD);
block_put(b);
clusters++;
}
return clusters * spc;
}
static void fat_node_initialize(fat_node_t *node)
{
futex_initialize(&node->lock, 1);
282,52 → 73,73
node->dirty = false;
}
static uint16_t fat_bps_get(dev_handle_t dev_handle)
static void fat_node_sync(fat_node_t *node)
{
block_t *bb;
block_t *b;
fat_bs_t *bs;
fat_dentry_t *d;
uint16_t bps;
unsigned dps;
bb = block_get(dev_handle, BS_BLOCK, BS_SIZE);
assert(bb != NULL);
bps = uint16_t_le2host(FAT_BS(bb)->bps);
block_put(bb);
assert(node->dirty);
return bps;
}
bs = block_bb_get(node->idx->dev_handle);
bps = uint16_t_le2host(bs->bps);
dps = bps / sizeof(fat_dentry_t);
/* Read the block that contains the dentry of interest. */
b = _fat_block_get(bs, node->idx->dev_handle, node->idx->pfc,
(node->idx->pdi * sizeof(fat_dentry_t)) / bps, BLOCK_FLAGS_NONE);
typedef enum {
FAT_DENTRY_SKIP,
FAT_DENTRY_LAST,
FAT_DENTRY_VALID
} fat_dentry_clsf_t;
d = ((fat_dentry_t *)b->data) + (node->idx->pdi % dps);
static fat_dentry_clsf_t fat_classify_dentry(fat_dentry_t *d)
{
if (d->attr & FAT_ATTR_VOLLABEL) {
/* volume label entry */
return FAT_DENTRY_SKIP;
d->firstc = host2uint16_t_le(node->firstc);
if (node->type == FAT_FILE) {
d->size = host2uint32_t_le(node->size);
} else if (node->type == FAT_DIRECTORY) {
d->attr = FAT_ATTR_SUBDIR;
}
if (d->name[0] == FAT_DENTRY_ERASED) {
/* not-currently-used entry */
return FAT_DENTRY_SKIP;
}
if (d->name[0] == FAT_DENTRY_UNUSED) {
/* never used entry */
return FAT_DENTRY_LAST;
}
if (d->name[0] == FAT_DENTRY_DOT) {
/*
* Most likely '.' or '..'.
* It cannot occur in a regular file name.
*/
return FAT_DENTRY_SKIP;
}
return FAT_DENTRY_VALID;
/* TODO: update other fields? (e.g time fields) */
b->dirty = true; /* need to sync block */
block_put(b);
}
static void fat_node_sync(fat_node_t *node)
static fat_node_t *fat_node_get_new(void)
{
/* TODO */
fat_node_t *nodep;
futex_down(&ffn_futex);
if (!list_empty(&ffn_head)) {
/* Try to use a cached free node structure. */
fat_idx_t *idxp_tmp;
nodep = list_get_instance(ffn_head.next, fat_node_t, ffn_link);
if (futex_trydown(&nodep->lock) == ESYNCH_WOULD_BLOCK)
goto skip_cache;
idxp_tmp = nodep->idx;
if (futex_trydown(&idxp_tmp->lock) == ESYNCH_WOULD_BLOCK) {
futex_up(&nodep->lock);
goto skip_cache;
}
list_remove(&nodep->ffn_link);
futex_up(&ffn_futex);
if (nodep->dirty)
fat_node_sync(nodep);
idxp_tmp->nodep = NULL;
futex_up(&nodep->lock);
futex_up(&idxp_tmp->lock);
} else {
skip_cache:
/* Try to allocate a new node structure. */
futex_up(&ffn_futex);
nodep = (fat_node_t *)malloc(sizeof(fat_node_t));
if (!nodep)
return NULL;
}
fat_node_initialize(nodep);
return nodep;
}
/** Internal version of fat_node_get().
337,9 → 149,11
static void *fat_node_get_core(fat_idx_t *idxp)
{
block_t *b;
fat_bs_t *bs;
fat_dentry_t *d;
fat_node_t *nodep = NULL;
unsigned bps;
unsigned spc;
unsigned dps;
if (idxp->nodep) {
360,41 → 174,18
assert(idxp->pfc);
futex_down(&ffn_futex);
if (!list_empty(&ffn_head)) {
/* Try to use a cached free node structure. */
fat_idx_t *idxp_tmp;
nodep = list_get_instance(ffn_head.next, fat_node_t, ffn_link);
if (futex_trydown(&nodep->lock) == ESYNCH_WOULD_BLOCK)
goto skip_cache;
idxp_tmp = nodep->idx;
if (futex_trydown(&idxp_tmp->lock) == ESYNCH_WOULD_BLOCK) {
futex_up(&nodep->lock);
goto skip_cache;
}
list_remove(&nodep->ffn_link);
futex_up(&ffn_futex);
if (nodep->dirty)
fat_node_sync(nodep);
idxp_tmp->nodep = NULL;
futex_up(&nodep->lock);
futex_up(&idxp_tmp->lock);
} else {
skip_cache:
/* Try to allocate a new node structure. */
futex_up(&ffn_futex);
nodep = (fat_node_t *)malloc(sizeof(fat_node_t));
if (!nodep)
return NULL;
}
fat_node_initialize(nodep);
nodep = fat_node_get_new();
if (!nodep)
return NULL;
bps = fat_bps_get(idxp->dev_handle);
bs = block_bb_get(idxp->dev_handle);
bps = uint16_t_le2host(bs->bps);
spc = bs->spc;
dps = bps / sizeof(fat_dentry_t);
/* Read the block that contains the dentry of interest. */
b = _fat_block_get(idxp->dev_handle, idxp->pfc,
(idxp->pdi * sizeof(fat_dentry_t)) / bps);
b = _fat_block_get(bs, idxp->dev_handle, idxp->pfc,
(idxp->pdi * sizeof(fat_dentry_t)) / bps, BLOCK_FLAGS_NONE);
assert(b);
d = ((fat_dentry_t *)b->data) + (idxp->pdi % dps);
410,7 → 201,7
* defined for the directory entry type. We must determine the
* size of the directory by walking the FAT.
*/
nodep->size = bps * _fat_blcks_get(idxp->dev_handle,
nodep->size = bps * spc * fat_clusters_get(bs, idxp->dev_handle,
uint16_t_le2host(d->firstc));
} else {
nodep->type = FAT_FILE;
429,8 → 220,31
return nodep;
}
/*
* Forward declarations of FAT libfs operations.
*/
static void *fat_node_get(dev_handle_t, fs_index_t);
static void fat_node_put(void *);
static void *fat_create_node(dev_handle_t, int);
static int fat_destroy_node(void *);
static int fat_link(void *, void *, const char *);
static int fat_unlink(void *, void *);
static void *fat_match(void *, const char *);
static fs_index_t fat_index_get(void *);
static size_t fat_size_get(void *);
static unsigned fat_lnkcnt_get(void *);
static bool fat_has_children(void *);
static void *fat_root_get(dev_handle_t);
static char fat_plb_get_char(unsigned);
static bool fat_is_directory(void *);
static bool fat_is_file(void *node);
/*
* FAT libfs operations.
*/
/** Instantiate a FAT in-core node. */
static void *fat_node_get(dev_handle_t dev_handle, fs_index_t index)
void *fat_node_get(dev_handle_t dev_handle, fs_index_t index)
{
void *node;
fat_idx_t *idxp;
444,41 → 258,318
return node;
}
static void fat_node_put(void *node)
void fat_node_put(void *node)
{
fat_node_t *nodep = (fat_node_t *)node;
bool destroy = false;
futex_down(&nodep->lock);
if (!--nodep->refcnt) {
futex_down(&ffn_futex);
list_append(&nodep->ffn_link, &ffn_head);
futex_up(&ffn_futex);
if (nodep->idx) {
futex_down(&ffn_futex);
list_append(&nodep->ffn_link, &ffn_head);
futex_up(&ffn_futex);
} else {
/*
* The node does not have any index structure associated
* with itself. This can only mean that we are releasing
* the node after a failed attempt to allocate the index
* structure for it.
*/
destroy = true;
}
}
futex_up(&nodep->lock);
if (destroy)
free(node);
}
static void *fat_create(int flags)
void *fat_create_node(dev_handle_t dev_handle, int flags)
{
return NULL; /* not supported at the moment */
fat_idx_t *idxp;
fat_node_t *nodep;
fat_bs_t *bs;
fat_cluster_t mcl, lcl;
uint16_t bps;
int rc;
bs = block_bb_get(dev_handle);
bps = uint16_t_le2host(bs->bps);
if (flags & L_DIRECTORY) {
/* allocate a cluster */
rc = fat_alloc_clusters(bs, dev_handle, 1, &mcl, &lcl);
if (rc != EOK)
return NULL;
}
nodep = fat_node_get_new();
if (!nodep) {
fat_free_clusters(bs, dev_handle, mcl);
return NULL;
}
idxp = fat_idx_get_new(dev_handle);
if (!idxp) {
fat_free_clusters(bs, dev_handle, mcl);
fat_node_put(nodep);
return NULL;
}
/* idxp->lock held */
if (flags & L_DIRECTORY) {
int i;
block_t *b;
/*
* Populate the new cluster with unused dentries.
*/
for (i = 0; i < bs->spc; i++) {
b = _fat_block_get(bs, dev_handle, mcl, i,
BLOCK_FLAGS_NOREAD);
/* mark all dentries as never-used */
memset(b->data, 0, bps);
b->dirty = false;
block_put(b);
}
nodep->type = FAT_DIRECTORY;
nodep->firstc = mcl;
nodep->size = bps * bs->spc;
} else {
nodep->type = FAT_FILE;
nodep->firstc = FAT_CLST_RES0;
nodep->size = 0;
}
nodep->lnkcnt = 0; /* not linked anywhere */
nodep->refcnt = 1;
nodep->dirty = true;
nodep->idx = idxp;
idxp->nodep = nodep;
futex_up(&idxp->lock);
return nodep;
}
static int fat_destroy(void *node)
int fat_destroy_node(void *node)
{
return ENOTSUP; /* not supported at the moment */
fat_node_t *nodep = (fat_node_t *)node;
fat_bs_t *bs;
/*
* The node is not reachable from the file system. This means that the
* link count should be zero and that the index structure cannot be
* found in the position hash. Obviously, we don't need to lock the node
* nor its index structure.
*/
assert(nodep->lnkcnt == 0);
/*
* The node may not have any children.
*/
assert(fat_has_children(node) == false);
bs = block_bb_get(nodep->idx->dev_handle);
if (nodep->firstc != FAT_CLST_RES0) {
assert(nodep->size);
/* Free all clusters allocated to the node. */
fat_free_clusters(bs, nodep->idx->dev_handle, nodep->firstc);
}
fat_idx_destroy(nodep->idx);
free(nodep);
return EOK;
}
static bool fat_link(void *prnt, void *chld, const char *name)
int fat_link(void *prnt, void *chld, const char *name)
{
return false; /* not supported at the moment */
fat_node_t *parentp = (fat_node_t *)prnt;
fat_node_t *childp = (fat_node_t *)chld;
fat_dentry_t *d;
fat_bs_t *bs;
block_t *b;
int i, j;
uint16_t bps;
unsigned dps;
unsigned blocks;
fat_cluster_t mcl, lcl;
int rc;
futex_down(&childp->lock);
if (childp->lnkcnt == 1) {
/*
* On FAT, we don't support multiple hard links.
*/
futex_up(&childp->lock);
return EMLINK;
}
assert(childp->lnkcnt == 0);
futex_up(&childp->lock);
if (!fat_dentry_name_verify(name)) {
/*
* Attempt to create unsupported name.
*/
return ENOTSUP;
}
/*
* Get us an unused parent node's dentry or grow the parent and allocate
* a new one.
*/
futex_down(&parentp->idx->lock);
bs = block_bb_get(parentp->idx->dev_handle);
bps = uint16_t_le2host(bs->bps);
dps = bps / sizeof(fat_dentry_t);
blocks = parentp->size / bps;
for (i = 0; i < blocks; i++) {
b = fat_block_get(bs, parentp, i, BLOCK_FLAGS_NONE);
for (j = 0; j < dps; j++) {
d = ((fat_dentry_t *)b->data) + j;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_VALID:
/* skipping used and meta entries */
continue;
case FAT_DENTRY_FREE:
case FAT_DENTRY_LAST:
/* found an empty slot */
goto hit;
}
}
block_put(b);
}
j = 0;
/*
* We need to grow the parent in order to create a new unused dentry.
*/
if (parentp->idx->pfc == FAT_CLST_ROOT) {
/* Can't grow the root directory. */
futex_up(&parentp->idx->lock);
return ENOSPC;
}
rc = fat_alloc_clusters(bs, parentp->idx->dev_handle, 1, &mcl, &lcl);
if (rc != EOK) {
futex_up(&parentp->idx->lock);
return rc;
}
fat_append_clusters(bs, parentp, mcl);
b = fat_block_get(bs, parentp, i, BLOCK_FLAGS_NOREAD);
d = (fat_dentry_t *)b->data;
/*
* Clear all dentries in the block except for the first one (the first
* dentry will be cleared in the next step).
*/
memset(d + 1, 0, bps - sizeof(fat_dentry_t));
hit:
/*
* At this point we only establish the link between the parent and the
* child. The dentry, except of the name and the extension, will remain
* uninitialized until the corresponding node is synced. Thus the valid
* dentry data is kept in the child node structure.
*/
memset(d, 0, sizeof(fat_dentry_t));
fat_dentry_name_set(d, name);
b->dirty = true; /* need to sync block */
block_put(b);
futex_up(&parentp->idx->lock);
futex_down(&childp->idx->lock);
/*
* If possible, create the Sub-directory Identifier Entry and the
* Sub-directory Parent Pointer Entry (i.e. "." and ".."). These entries
* are not mandatory according to Standard ECMA-107 and HelenOS VFS does
* not use them anyway, so this is rather a sign of our good will.
*/
b = fat_block_get(bs, childp, 0, BLOCK_FLAGS_NONE);
d = (fat_dentry_t *)b->data;
if (fat_classify_dentry(d) == FAT_DENTRY_LAST ||
strcmp(d->name, FAT_NAME_DOT) == 0) {
memset(d, 0, sizeof(fat_dentry_t));
strcpy(d->name, FAT_NAME_DOT);
strcpy(d->ext, FAT_EXT_PAD);
d->attr = FAT_ATTR_SUBDIR;
d->firstc = host2uint16_t_le(childp->firstc);
/* TODO: initialize also the date/time members. */
}
d++;
if (fat_classify_dentry(d) == FAT_DENTRY_LAST ||
strcmp(d->name, FAT_NAME_DOT_DOT) == 0) {
memset(d, 0, sizeof(fat_dentry_t));
strcpy(d->name, FAT_NAME_DOT_DOT);
strcpy(d->ext, FAT_EXT_PAD);
d->attr = FAT_ATTR_SUBDIR;
d->firstc = (parentp->firstc == FAT_CLST_ROOT) ?
host2uint16_t_le(FAT_CLST_RES0) :
host2uint16_t_le(parentp->firstc);
/* TODO: initialize also the date/time members. */
}
b->dirty = true; /* need to sync block */
block_put(b);
childp->idx->pfc = parentp->firstc;
childp->idx->pdi = i * dps + j;
futex_up(&childp->idx->lock);
futex_down(&childp->lock);
childp->lnkcnt = 1;
childp->dirty = true; /* need to sync node */
futex_up(&childp->lock);
/*
* Hash in the index structure into the position hash.
*/
fat_idx_hashin(childp->idx);
return EOK;
}
static int fat_unlink(void *prnt, void *chld)
int fat_unlink(void *prnt, void *chld)
{
return ENOTSUP; /* not supported at the moment */
fat_node_t *parentp = (fat_node_t *)prnt;
fat_node_t *childp = (fat_node_t *)chld;
fat_bs_t *bs;
fat_dentry_t *d;
uint16_t bps;
block_t *b;
futex_down(&parentp->lock);
futex_down(&childp->lock);
assert(childp->lnkcnt == 1);
futex_down(&childp->idx->lock);
bs = block_bb_get(childp->idx->dev_handle);
bps = uint16_t_le2host(bs->bps);
b = _fat_block_get(bs, childp->idx->dev_handle, childp->idx->pfc,
(childp->idx->pdi * sizeof(fat_dentry_t)) / bps,
BLOCK_FLAGS_NONE);
d = (fat_dentry_t *)b->data +
(childp->idx->pdi % (bps / sizeof(fat_dentry_t)));
/* mark the dentry as not-currently-used */
d->name[0] = FAT_DENTRY_ERASED;
b->dirty = true; /* need to sync block */
block_put(b);
/* remove the index structure from the position hash */
fat_idx_hashout(childp->idx);
/* clear position information */
childp->idx->pfc = FAT_CLST_RES0;
childp->idx->pdi = 0;
futex_up(&childp->idx->lock);
childp->lnkcnt = 0;
childp->dirty = true;
futex_up(&childp->lock);
futex_up(&parentp->lock);
return EOK;
}
static void *fat_match(void *prnt, const char *component)
void *fat_match(void *prnt, const char *component)
{
fat_bs_t *bs;
fat_node_t *parentp = (fat_node_t *)prnt;
char name[FAT_NAME_LEN + 1 + FAT_EXT_LEN + 1];
unsigned i, j;
489,20 → 580,17
block_t *b;
futex_down(&parentp->idx->lock);
bps = fat_bps_get(parentp->idx->dev_handle);
bs = block_bb_get(parentp->idx->dev_handle);
bps = uint16_t_le2host(bs->bps);
dps = bps / sizeof(fat_dentry_t);
blocks = parentp->size / bps + (parentp->size % bps != 0);
blocks = parentp->size / bps;
for (i = 0; i < blocks; i++) {
unsigned dentries;
b = fat_block_get(parentp, i);
dentries = (i == blocks - 1) ?
parentp->size % sizeof(fat_dentry_t) :
dps;
for (j = 0; j < dentries; j++) {
b = fat_block_get(bs, parentp, i, BLOCK_FLAGS_NONE);
for (j = 0; j < dps; j++) {
d = ((fat_dentry_t *)b->data) + j;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_FREE:
continue;
case FAT_DENTRY_LAST:
block_put(b);
510,10 → 598,10
return NULL;
default:
case FAT_DENTRY_VALID:
dentry_name_canonify(d, name);
fat_dentry_name_get(d, name);
break;
}
if (stricmp(name, component) == 0) {
if (fat_dentry_namecmp(name, component) == 0) {
/* hit */
void *node;
/*
542,11 → 630,12
}
block_put(b);
}
futex_up(&parentp->idx->lock);
return NULL;
}
static fs_index_t fat_index_get(void *node)
fs_index_t fat_index_get(void *node)
{
fat_node_t *fnodep = (fat_node_t *)node;
if (!fnodep)
554,18 → 643,19
return fnodep->idx->index;
}
static size_t fat_size_get(void *node)
size_t fat_size_get(void *node)
{
return ((fat_node_t *)node)->size;
}
static unsigned fat_lnkcnt_get(void *node)
unsigned fat_lnkcnt_get(void *node)
{
return ((fat_node_t *)node)->lnkcnt;
}
static bool fat_has_children(void *node)
bool fat_has_children(void *node)
{
fat_bs_t *bs;
fat_node_t *nodep = (fat_node_t *)node;
unsigned bps;
unsigned dps;
575,25 → 665,23
if (nodep->type != FAT_DIRECTORY)
return false;
futex_down(&nodep->idx->lock);
bps = fat_bps_get(nodep->idx->dev_handle);
bs = block_bb_get(nodep->idx->dev_handle);
bps = uint16_t_le2host(bs->bps);
dps = bps / sizeof(fat_dentry_t);
blocks = nodep->size / bps + (nodep->size % bps != 0);
blocks = nodep->size / bps;
for (i = 0; i < blocks; i++) {
unsigned dentries;
fat_dentry_t *d;
b = fat_block_get(nodep, i);
dentries = (i == blocks - 1) ?
nodep->size % sizeof(fat_dentry_t) :
dps;
for (j = 0; j < dentries; j++) {
b = fat_block_get(bs, nodep, i, BLOCK_FLAGS_NONE);
for (j = 0; j < dps; j++) {
d = ((fat_dentry_t *)b->data) + j;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_FREE:
continue;
case FAT_DENTRY_LAST:
block_put(b);
616,22 → 704,22
return false;
}
static void *fat_root_get(dev_handle_t dev_handle)
void *fat_root_get(dev_handle_t dev_handle)
{
return fat_node_get(dev_handle, 0);
}
static char fat_plb_get_char(unsigned pos)
char fat_plb_get_char(unsigned pos)
{
return fat_reg.plb_ro[pos % PLB_SIZE];
}
static bool fat_is_directory(void *node)
bool fat_is_directory(void *node)
{
return ((fat_node_t *)node)->type == FAT_DIRECTORY;
}
static bool fat_is_file(void *node)
bool fat_is_file(void *node)
{
return ((fat_node_t *)node)->type == FAT_FILE;
}
641,8 → 729,8
.match = fat_match,
.node_get = fat_node_get,
.node_put = fat_node_put,
.create = fat_create,
.destroy = fat_destroy,
.create = fat_create_node,
.destroy = fat_destroy_node,
.link = fat_link,
.unlink = fat_unlink,
.index_get = fat_index_get,
655,60 → 743,57
.is_file = fat_is_file
};
/*
* VFS operations.
*/
void fat_mounted(ipc_callid_t rid, ipc_call_t *request)
{
dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
block_t *bb;
fat_bs_t *bs;
uint16_t bps;
uint16_t rde;
int rc;
/*
* For now, we don't bother to remember dev_handle, dev_phone or
* dev_buffer in some data structure. We use global variables because we
* know there will be at most one mount on this file system.
* Of course, this is a huge TODO item.
*/
dev_buffer = mmap(NULL, BS_SIZE, PROTO_READ | PROTO_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
if (!dev_buffer) {
ipc_answer_0(rid, ENOMEM);
/* initialize libblock */
rc = block_init(dev_handle, BS_SIZE);
if (rc != EOK) {
ipc_answer_0(rid, rc);
return;
}
dev_phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
DEVMAP_CONNECT_TO_DEVICE, dev_handle);
if (dev_phone < 0) {
munmap(dev_buffer, BS_SIZE);
ipc_answer_0(rid, dev_phone);
return;
}
rc = ipc_share_out_start(dev_phone, dev_buffer,
AS_AREA_READ | AS_AREA_WRITE);
/* prepare the boot block */
rc = block_bb_read(dev_handle, BS_BLOCK * BS_SIZE, BS_SIZE);
if (rc != EOK) {
munmap(dev_buffer, BS_SIZE);
block_fini(dev_handle);
ipc_answer_0(rid, rc);
return;
}
/* get the buffer with the boot sector */
bs = block_bb_get(dev_handle);
/* Read the number of root directory entries. */
bb = block_get(dev_handle, BS_BLOCK, BS_SIZE);
bps = uint16_t_le2host(FAT_BS(bb)->bps);
rde = uint16_t_le2host(FAT_BS(bb)->root_ent_max);
block_put(bb);
bps = uint16_t_le2host(bs->bps);
rde = uint16_t_le2host(bs->root_ent_max);
if (bps != BS_SIZE) {
munmap(dev_buffer, BS_SIZE);
block_fini(dev_handle);
ipc_answer_0(rid, ENOTSUP);
return;
}
/* Initialize the block cache */
rc = block_cache_init(dev_handle, bps, 0 /* XXX */);
if (rc != EOK) {
block_fini(dev_handle);
ipc_answer_0(rid, rc);
return;
}
rc = fat_idx_init_by_dev_handle(dev_handle);
if (rc != EOK) {
munmap(dev_buffer, BS_SIZE);
block_fini(dev_handle);
ipc_answer_0(rid, rc);
return;
}
716,7 → 801,7
/* Initialize the root node. */
fat_node_t *rootp = (fat_node_t *)malloc(sizeof(fat_node_t));
if (!rootp) {
munmap(dev_buffer, BS_SIZE);
block_fini(dev_handle);
fat_idx_fini_by_dev_handle(dev_handle);
ipc_answer_0(rid, ENOMEM);
return;
725,7 → 810,7
fat_idx_t *ridxp = fat_idx_get_by_pos(dev_handle, FAT_CLST_ROOTPAR, 0);
if (!ridxp) {
munmap(dev_buffer, BS_SIZE);
block_fini(dev_handle);
free(rootp);
fat_idx_fini_by_dev_handle(dev_handle);
ipc_answer_0(rid, ENOMEM);
763,7 → 848,8
fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
off_t pos = (off_t)IPC_GET_ARG3(*request);
fat_node_t *nodep = (fat_node_t *)fat_node_get(dev_handle, index);
uint16_t bps = fat_bps_get(dev_handle);
fat_bs_t *bs;
uint16_t bps;
size_t bytes;
block_t *b;
781,6 → 867,9
return;
}
bs = block_bb_get(dev_handle);
bps = uint16_t_le2host(bs->bps);
if (nodep->type == FAT_FILE) {
/*
* Our strategy for regular file reads is to read one block at
787,11 → 876,19
* most and make use of the possibility to return less data than
* requested. This keeps the code very simple.
*/
bytes = min(len, bps - pos % bps);
b = fat_block_get(nodep, pos / bps);
(void) ipc_data_read_finalize(callid, b->data + pos % bps,
bytes);
block_put(b);
if (pos >= nodep->size) {
/* reading beyond the EOF */
bytes = 0;
(void) ipc_data_read_finalize(callid, NULL, 0);
} else {
bytes = min(len, bps - pos % bps);
bytes = min(bytes, nodep->size - pos);
b = fat_block_get(bs, nodep, pos / bps,
BLOCK_FLAGS_NONE);
(void) ipc_data_read_finalize(callid, b->data + pos % bps,
bytes);
block_put(b);
}
} else {
unsigned bnum;
off_t spos = pos;
812,7 → 909,7
while (bnum < nodep->size / bps) {
off_t o;
b = fat_block_get(nodep, bnum);
b = fat_block_get(bs, nodep, bnum, BLOCK_FLAGS_NONE);
for (o = pos % (bps / sizeof(fat_dentry_t));
o < bps / sizeof(fat_dentry_t);
o++, pos++) {
819,6 → 916,7
d = ((fat_dentry_t *)b->data) + o;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_FREE:
continue;
case FAT_DENTRY_LAST:
block_put(b);
825,7 → 923,7
goto miss;
default:
case FAT_DENTRY_VALID:
dentry_name_canonify(d, name);
fat_dentry_name_get(d, name);
block_put(b);
goto hit;
}
847,6 → 945,186
ipc_answer_1(rid, EOK, (ipcarg_t)bytes);
}
void fat_write(ipc_callid_t rid, ipc_call_t *request)
{
dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
off_t pos = (off_t)IPC_GET_ARG3(*request);
fat_node_t *nodep = (fat_node_t *)fat_node_get(dev_handle, index);
fat_bs_t *bs;
size_t bytes;
block_t *b;
uint16_t bps;
unsigned spc;
unsigned bpc; /* bytes per cluster */
off_t boundary;
int flags = BLOCK_FLAGS_NONE;
if (!nodep) {
ipc_answer_0(rid, ENOENT);
return;
}
ipc_callid_t callid;
size_t len;
if (!ipc_data_write_receive(&callid, &len)) {
fat_node_put(nodep);
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
bs = block_bb_get(dev_handle);
bps = uint16_t_le2host(bs->bps);
spc = bs->spc;
bpc = bps * spc;
/*
* In all scenarios, we will attempt to write out only one block worth
* of data at maximum. There might be some more efficient approaches,
* but this one greatly simplifies fat_write(). Note that we can afford
* to do this because the client must be ready to handle the return
* value signalizing a smaller number of bytes written.
*/
bytes = min(len, bps - pos % bps);
if (bytes == bps)
flags |= BLOCK_FLAGS_NOREAD;
boundary = ROUND_UP(nodep->size, bpc);
if (pos < boundary) {
/*
* This is the easier case - we are either overwriting already
* existing contents or writing behind the EOF, but still within
* the limits of the last cluster. The node size may grow to the
* next block size boundary.
*/
fat_fill_gap(bs, nodep, FAT_CLST_RES0, pos);
b = fat_block_get(bs, nodep, pos / bps, flags);
(void) ipc_data_write_finalize(callid, b->data + pos % bps,
bytes);
b->dirty = true; /* need to sync block */
block_put(b);
if (pos + bytes > nodep->size) {
nodep->size = pos + bytes;
nodep->dirty = true; /* need to sync node */
}
ipc_answer_2(rid, EOK, bytes, nodep->size);
fat_node_put(nodep);
return;
} else {
/*
* This is the more difficult case. We must allocate new
* clusters for the node and zero them out.
*/
int status;
unsigned nclsts;
fat_cluster_t mcl, lcl;
nclsts = (ROUND_UP(pos + bytes, bpc) - boundary) / bpc;
/* create an independent chain of nclsts clusters in all FATs */
status = fat_alloc_clusters(bs, dev_handle, nclsts, &mcl, &lcl);
if (status != EOK) {
/* could not allocate a chain of nclsts clusters */
fat_node_put(nodep);
ipc_answer_0(callid, status);
ipc_answer_0(rid, status);
return;
}
/* zero fill any gaps */
fat_fill_gap(bs, nodep, mcl, pos);
b = _fat_block_get(bs, dev_handle, lcl, (pos / bps) % spc,
flags);
(void) ipc_data_write_finalize(callid, b->data + pos % bps,
bytes);
b->dirty = true; /* need to sync block */
block_put(b);
/*
* Append the cluster chain starting in mcl to the end of the
* node's cluster chain.
*/
fat_append_clusters(bs, nodep, mcl);
nodep->size = pos + bytes;
nodep->dirty = true; /* need to sync node */
ipc_answer_2(rid, EOK, bytes, nodep->size);
fat_node_put(nodep);
return;
}
}
void fat_truncate(ipc_callid_t rid, ipc_call_t *request)
{
dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
size_t size = (off_t)IPC_GET_ARG3(*request);
fat_node_t *nodep = (fat_node_t *)fat_node_get(dev_handle, index);
fat_bs_t *bs;
uint16_t bps;
uint8_t spc;
unsigned bpc; /* bytes per cluster */
int rc;
if (!nodep) {
ipc_answer_0(rid, ENOENT);
return;
}
bs = block_bb_get(dev_handle);
bps = uint16_t_le2host(bs->bps);
spc = bs->spc;
bpc = bps * spc;
if (nodep->size == size) {
rc = EOK;
} else if (nodep->size < size) {
/*
* The standard says we have the freedom to grow the node.
* For now, we simply return an error.
*/
rc = EINVAL;
} else if (ROUND_UP(nodep->size, bpc) == ROUND_UP(size, bpc)) {
/*
* The node will be shrunk, but no clusters will be deallocated.
*/
nodep->size = size;
nodep->dirty = true; /* need to sync node */
rc = EOK;
} else {
/*
* The node will be shrunk, clusters will be deallocated.
*/
if (size == 0) {
fat_chop_clusters(bs, nodep, FAT_CLST_RES0);
} else {
fat_cluster_t lastc;
(void) fat_cluster_walk(bs, dev_handle, nodep->firstc,
&lastc, (size - 1) / bpc);
fat_chop_clusters(bs, nodep, lastc);
}
nodep->size = size;
nodep->dirty = true; /* need to sync node */
rc = EOK;
}
fat_node_put(nodep);
ipc_answer_0(rid, rc);
return;
}
void fat_destroy(ipc_callid_t rid, ipc_call_t *request)
{
dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
int rc;
fat_node_t *nodep = fat_node_get(dev_handle, index);
if (!nodep) {
ipc_answer_0(rid, ENOENT);
return;
}
rc = fat_destroy_node(nodep);
ipc_answer_0(rid, rc);
}
/**
* @}
*/

/branches/network/uspace/srv/fs/fat/Makefile
31,12 → 31,17
LIBC_PREFIX = ../../../lib/libc
LIBFS_PREFIX = ../../../lib/libfs
LIBBLOCK_PREFIX = ../../../lib/libblock
SOFTINT_PREFIX = ../../../lib/softint
include $(LIBC_PREFIX)/Makefile.toolchain
CFLAGS += -I $(LIBFS_PREFIX)
CFLAGS += -I $(LIBFS_PREFIX) -I $(LIBBLOCK_PREFIX)
LIBS = $(LIBC_PREFIX)/libc.a $(LIBFS_PREFIX)/libfs.a
LIBS = \
$(LIBFS_PREFIX)/libfs.a \
$(LIBBLOCK_PREFIX)/libblock.a \
$(LIBC_PREFIX)/libc.a
## Sources
#
45,7 → 50,9
SOURCES = \
fat.c \
fat_ops.c \
fat_idx.c
fat_idx.c \
fat_dentry.c \
fat_fat.c
OBJECTS := $(addsuffix .o,$(basename $(SOURCES)))
56,13 → 63,13
-include Makefile.depend
clean:
-rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend
-rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend $(OBJECTS)
depend:
$(CC) $(DEFS) $(CFLAGS) -M $(SOURCES) > Makefile.depend
$(OUTPUT): $(OBJECTS) $(LIBS)
$(LD) -T $(LIBC_PREFIX)/arch/$(ARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map
$(LD) -T $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map
disasm: $(OUTPUT).disasm