Subversion Repositories HelenOS

Compare Revisions

Ignore whitespace Rev 4586 → Rev 4687

/tags/0.4.1/uspace/srv/fs/tmpfs/tmpfs_ops.c
0,0 → 1,644
/*
* 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 tmpfs_ops.c
* @brief Implementation of VFS operations for the TMPFS file system
* server.
*/
 
#include "tmpfs.h"
#include "../../vfs/vfs.h"
#include <ipc/ipc.h>
#include <async.h>
#include <errno.h>
#include <atomic.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <sys/types.h>
#include <adt/hash_table.h>
#include <as.h>
#include <libfs.h>
 
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
 
#define NODES_BUCKETS 256
 
/** All root nodes have index 0. */
#define TMPFS_SOME_ROOT 0
/** Global counter for assigning node indices. Shared by all instances. */
fs_index_t tmpfs_next_index = 1;
 
/*
* Implementation of the libfs interface.
*/
 
/* Forward declarations of static functions. */
static fs_node_t *tmpfs_match(fs_node_t *, const char *);
static fs_node_t *tmpfs_node_get(dev_handle_t, fs_index_t);
static void tmpfs_node_put(fs_node_t *);
static fs_node_t *tmpfs_create_node(dev_handle_t, int);
static int tmpfs_link_node(fs_node_t *, fs_node_t *, const char *);
static int tmpfs_unlink_node(fs_node_t *, fs_node_t *, const char *);
static int tmpfs_destroy_node(fs_node_t *);
 
/* Implementation of helper functions. */
static fs_index_t tmpfs_index_get(fs_node_t *fn)
{
return TMPFS_NODE(fn)->index;
}
 
static size_t tmpfs_size_get(fs_node_t *fn)
{
return TMPFS_NODE(fn)->size;
}
 
static unsigned tmpfs_lnkcnt_get(fs_node_t *fn)
{
return TMPFS_NODE(fn)->lnkcnt;
}
 
static bool tmpfs_has_children(fs_node_t *fn)
{
return !list_empty(&TMPFS_NODE(fn)->cs_head);
}
 
static fs_node_t *tmpfs_root_get(dev_handle_t dev_handle)
{
return tmpfs_node_get(dev_handle, TMPFS_SOME_ROOT);
}
 
static char tmpfs_plb_get_char(unsigned pos)
{
return tmpfs_reg.plb_ro[pos % PLB_SIZE];
}
 
static bool tmpfs_is_directory(fs_node_t *fn)
{
return TMPFS_NODE(fn)->type == TMPFS_DIRECTORY;
}
 
static bool tmpfs_is_file(fs_node_t *fn)
{
return TMPFS_NODE(fn)->type == TMPFS_FILE;
}
 
/** libfs operations */
libfs_ops_t tmpfs_libfs_ops = {
.match = tmpfs_match,
.node_get = tmpfs_node_get,
.node_put = tmpfs_node_put,
.create = tmpfs_create_node,
.destroy = tmpfs_destroy_node,
.link = tmpfs_link_node,
.unlink = tmpfs_unlink_node,
.index_get = tmpfs_index_get,
.size_get = tmpfs_size_get,
.lnkcnt_get = tmpfs_lnkcnt_get,
.has_children = tmpfs_has_children,
.root_get = tmpfs_root_get,
.plb_get_char = tmpfs_plb_get_char,
.is_directory = tmpfs_is_directory,
.is_file = tmpfs_is_file
};
 
/** Hash table of all TMPFS nodes. */
hash_table_t nodes;
 
#define NODES_KEY_INDEX 0
#define NODES_KEY_DEV 1
 
/* Implementation of hash table interface for the nodes hash table. */
static hash_index_t nodes_hash(unsigned long key[])
{
return key[NODES_KEY_INDEX] % NODES_BUCKETS;
}
 
static int nodes_compare(unsigned long key[], hash_count_t keys, link_t *item)
{
tmpfs_node_t *nodep = hash_table_get_instance(item, tmpfs_node_t,
nh_link);
return (nodep->index == key[NODES_KEY_INDEX] &&
nodep->dev_handle == key[NODES_KEY_DEV]);
}
 
static void nodes_remove_callback(link_t *item)
{
}
 
/** TMPFS nodes hash table operations. */
hash_table_operations_t nodes_ops = {
.hash = nodes_hash,
.compare = nodes_compare,
.remove_callback = nodes_remove_callback
};
 
static void tmpfs_node_initialize(tmpfs_node_t *nodep)
{
nodep->bp = NULL;
nodep->index = 0;
nodep->dev_handle = 0;
nodep->type = TMPFS_NONE;
nodep->lnkcnt = 0;
nodep->size = 0;
nodep->data = NULL;
link_initialize(&nodep->nh_link);
list_initialize(&nodep->cs_head);
}
 
static void tmpfs_dentry_initialize(tmpfs_dentry_t *dentryp)
{
link_initialize(&dentryp->link);
dentryp->name = NULL;
dentryp->node = NULL;
}
 
bool tmpfs_init(void)
{
if (!hash_table_create(&nodes, NODES_BUCKETS, 2, &nodes_ops))
return false;
return true;
}
 
static bool tmpfs_instance_init(dev_handle_t dev_handle)
{
fs_node_t *rfn;
rfn = tmpfs_create_node(dev_handle, L_DIRECTORY);
if (!rfn)
return false;
TMPFS_NODE(rfn)->lnkcnt = 0; /* FS root is not linked */
return true;
}
 
fs_node_t *tmpfs_match(fs_node_t *pfn, const char *component)
{
tmpfs_node_t *parentp = TMPFS_NODE(pfn);
link_t *lnk;
 
for (lnk = parentp->cs_head.next; lnk != &parentp->cs_head;
lnk = lnk->next) {
tmpfs_dentry_t *dentryp = list_get_instance(lnk, tmpfs_dentry_t,
link);
if (!str_cmp(dentryp->name, component))
return FS_NODE(dentryp->node);
}
 
return NULL;
}
 
fs_node_t *tmpfs_node_get(dev_handle_t dev_handle, fs_index_t index)
{
unsigned long key[] = {
[NODES_KEY_INDEX] = index,
[NODES_KEY_DEV] = dev_handle
};
link_t *lnk = hash_table_find(&nodes, key);
if (!lnk)
return NULL;
return FS_NODE(hash_table_get_instance(lnk, tmpfs_node_t, nh_link));
}
 
void tmpfs_node_put(fs_node_t *fn)
{
/* nothing to do */
}
 
fs_node_t *tmpfs_create_node(dev_handle_t dev_handle, int lflag)
{
assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
 
tmpfs_node_t *nodep = malloc(sizeof(tmpfs_node_t));
if (!nodep)
return NULL;
tmpfs_node_initialize(nodep);
nodep->bp = malloc(sizeof(fs_node_t));
if (!nodep->bp) {
free(nodep);
return NULL;
}
fs_node_initialize(nodep->bp);
nodep->bp->data = nodep; /* link the FS and TMPFS nodes */
if (!tmpfs_root_get(dev_handle))
nodep->index = TMPFS_SOME_ROOT;
else
nodep->index = tmpfs_next_index++;
nodep->dev_handle = dev_handle;
if (lflag & L_DIRECTORY)
nodep->type = TMPFS_DIRECTORY;
else
nodep->type = TMPFS_FILE;
 
/* Insert the new node into the nodes hash table. */
unsigned long key[] = {
[NODES_KEY_INDEX] = nodep->index,
[NODES_KEY_DEV] = nodep->dev_handle
};
hash_table_insert(&nodes, key, &nodep->nh_link);
return FS_NODE(nodep);
}
 
int tmpfs_link_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
{
tmpfs_node_t *parentp = TMPFS_NODE(pfn);
tmpfs_node_t *childp = TMPFS_NODE(cfn);
tmpfs_dentry_t *dentryp;
link_t *lnk;
 
assert(parentp->type == TMPFS_DIRECTORY);
 
/* Check for duplicit entries. */
for (lnk = parentp->cs_head.next; lnk != &parentp->cs_head;
lnk = lnk->next) {
dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
if (!str_cmp(dentryp->name, nm))
return EEXIST;
}
 
/* Allocate and initialize the dentry. */
dentryp = malloc(sizeof(tmpfs_dentry_t));
if (!dentryp)
return ENOMEM;
tmpfs_dentry_initialize(dentryp);
 
/* Populate and link the new dentry. */
size_t size = str_size(nm);
dentryp->name = malloc(size + 1);
if (!dentryp->name) {
free(dentryp);
return ENOMEM;
}
str_cpy(dentryp->name, size + 1, nm);
dentryp->node = childp;
childp->lnkcnt++;
list_append(&dentryp->link, &parentp->cs_head);
 
return EOK;
}
 
int tmpfs_unlink_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
{
tmpfs_node_t *parentp = TMPFS_NODE(pfn);
tmpfs_node_t *childp = NULL;
tmpfs_dentry_t *dentryp;
link_t *lnk;
 
if (!parentp)
return EBUSY;
for (lnk = parentp->cs_head.next; lnk != &parentp->cs_head;
lnk = lnk->next) {
dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
if (!str_cmp(dentryp->name, nm)) {
childp = dentryp->node;
assert(FS_NODE(childp) == cfn);
break;
}
}
 
if (!childp)
return ENOENT;
if ((childp->lnkcnt == 1) && !list_empty(&childp->cs_head))
return ENOTEMPTY;
 
list_remove(&dentryp->link);
free(dentryp);
childp->lnkcnt--;
 
return EOK;
}
 
int tmpfs_destroy_node(fs_node_t *fn)
{
tmpfs_node_t *nodep = TMPFS_NODE(fn);
assert(!nodep->lnkcnt);
assert(list_empty(&nodep->cs_head));
 
unsigned long key[] = {
[NODES_KEY_INDEX] = nodep->index,
[NODES_KEY_DEV] = nodep->dev_handle
};
hash_table_remove(&nodes, key, 2);
 
if (nodep->type == TMPFS_FILE)
free(nodep->data);
free(nodep->bp);
free(nodep);
return EOK;
}
 
void tmpfs_mounted(ipc_callid_t rid, ipc_call_t *request)
{
dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
 
/* accept the mount options */
ipc_callid_t callid;
size_t size;
if (!ipc_data_write_receive(&callid, &size)) {
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
char *opts = malloc(size + 1);
if (!opts) {
ipc_answer_0(callid, ENOMEM);
ipc_answer_0(rid, ENOMEM);
return;
}
ipcarg_t retval = ipc_data_write_finalize(callid, opts, size);
if (retval != EOK) {
ipc_answer_0(rid, retval);
free(opts);
return;
}
opts[size] = '\0';
 
/* Initialize TMPFS instance. */
if (!tmpfs_instance_init(dev_handle)) {
ipc_answer_0(rid, ENOMEM);
return;
}
 
tmpfs_node_t *rootp = TMPFS_NODE(tmpfs_root_get(dev_handle));
if (str_cmp(opts, "restore") == 0) {
if (tmpfs_restore(dev_handle))
ipc_answer_3(rid, EOK, rootp->index, rootp->size,
rootp->lnkcnt);
else
ipc_answer_0(rid, ELIMIT);
} else {
ipc_answer_3(rid, EOK, rootp->index, rootp->size,
rootp->lnkcnt);
}
}
 
void tmpfs_mount(ipc_callid_t rid, ipc_call_t *request)
{
libfs_mount(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
}
 
void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request)
{
libfs_lookup(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
}
 
void tmpfs_read(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);
 
/*
* Lookup the respective TMPFS node.
*/
link_t *hlp;
unsigned long key[] = {
[NODES_KEY_INDEX] = index,
[NODES_KEY_DEV] = dev_handle,
};
hlp = hash_table_find(&nodes, key);
if (!hlp) {
ipc_answer_0(rid, ENOENT);
return;
}
tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
nh_link);
 
/*
* Receive the read request.
*/
ipc_callid_t callid;
size_t size;
if (!ipc_data_read_receive(&callid, &size)) {
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
 
size_t bytes;
if (nodep->type == TMPFS_FILE) {
bytes = max(0, min(nodep->size - pos, size));
(void) ipc_data_read_finalize(callid, nodep->data + pos,
bytes);
} else {
tmpfs_dentry_t *dentryp;
link_t *lnk;
int i;
assert(nodep->type == TMPFS_DIRECTORY);
/*
* Yes, we really use O(n) algorithm here.
* If it bothers someone, it could be fixed by introducing a
* hash table.
*/
for (i = 0, lnk = nodep->cs_head.next;
i < pos && lnk != &nodep->cs_head;
i++, lnk = lnk->next)
;
 
if (lnk == &nodep->cs_head) {
ipc_answer_0(callid, ENOENT);
ipc_answer_1(rid, ENOENT, 0);
return;
}
 
dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
 
(void) ipc_data_read_finalize(callid, dentryp->name,
str_size(dentryp->name) + 1);
bytes = 1;
}
 
/*
* Answer the VFS_READ call.
*/
ipc_answer_1(rid, EOK, bytes);
}
 
void tmpfs_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);
 
/*
* Lookup the respective TMPFS node.
*/
link_t *hlp;
unsigned long key[] = {
[NODES_KEY_INDEX] = index,
[NODES_KEY_DEV] = dev_handle
};
hlp = hash_table_find(&nodes, key);
if (!hlp) {
ipc_answer_0(rid, ENOENT);
return;
}
tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
nh_link);
 
/*
* Receive the write request.
*/
ipc_callid_t callid;
size_t size;
if (!ipc_data_write_receive(&callid, &size)) {
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
 
/*
* Check whether the file needs to grow.
*/
if (pos + size <= nodep->size) {
/* The file size is not changing. */
(void) ipc_data_write_finalize(callid, nodep->data + pos, size);
ipc_answer_2(rid, EOK, size, nodep->size);
return;
}
size_t delta = (pos + size) - nodep->size;
/*
* At this point, we are deliberately extremely straightforward and
* simply realloc the contents of the file on every write that grows the
* file. In the end, the situation might not be as bad as it may look:
* our heap allocator can save us and just grow the block whenever
* possible.
*/
void *newdata = realloc(nodep->data, nodep->size + delta);
if (!newdata) {
ipc_answer_0(callid, ENOMEM);
ipc_answer_2(rid, EOK, 0, nodep->size);
return;
}
/* Clear any newly allocated memory in order to emulate gaps. */
memset(newdata + nodep->size, 0, delta);
nodep->size += delta;
nodep->data = newdata;
(void) ipc_data_write_finalize(callid, nodep->data + pos, size);
ipc_answer_2(rid, EOK, size, nodep->size);
}
 
void tmpfs_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);
 
/*
* Lookup the respective TMPFS node.
*/
link_t *hlp;
unsigned long key[] = {
[NODES_KEY_INDEX] = index,
[NODES_KEY_DEV] = dev_handle
};
hlp = hash_table_find(&nodes, key);
if (!hlp) {
ipc_answer_0(rid, ENOENT);
return;
}
tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
nh_link);
 
if (size == nodep->size) {
ipc_answer_0(rid, EOK);
return;
}
 
void *newdata = realloc(nodep->data, size);
if (!newdata) {
ipc_answer_0(rid, ENOMEM);
return;
}
if (size > nodep->size) {
size_t delta = size - nodep->size;
memset(newdata + nodep->size, 0, delta);
}
nodep->size = size;
nodep->data = newdata;
ipc_answer_0(rid, EOK);
}
 
void tmpfs_close(ipc_callid_t rid, ipc_call_t *request)
{
ipc_answer_0(rid, EOK);
}
 
void tmpfs_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;
 
link_t *hlp;
unsigned long key[] = {
[NODES_KEY_INDEX] = index,
[NODES_KEY_DEV] = dev_handle
};
hlp = hash_table_find(&nodes, key);
if (!hlp) {
ipc_answer_0(rid, ENOENT);
return;
}
tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
nh_link);
rc = tmpfs_destroy_node(FS_NODE(nodep));
ipc_answer_0(rid, rc);
}
 
void tmpfs_open_node(ipc_callid_t rid, ipc_call_t *request)
{
libfs_open_node(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
}
 
void tmpfs_stat(ipc_callid_t rid, ipc_call_t *request)
{
libfs_stat(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
}
 
void tmpfs_sync(ipc_callid_t rid, ipc_call_t *request)
{
/* Dummy implementation */
ipc_answer_0(rid, EOK);
}
 
/**
* @}
*/
/tags/0.4.1/uspace/srv/fs/tmpfs/tmpfs.h
0,0 → 1,101
/*
* 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 TMPFS_TMPFS_H_
#define TMPFS_TMPFS_H_
 
#include <ipc/ipc.h>
#include <libfs.h>
#include <atomic.h>
#include <sys/types.h>
#include <bool.h>
#include <adt/hash_table.h>
 
#ifndef dprintf
#define dprintf(...) printf(__VA_ARGS__)
#endif
 
#define TMPFS_NODE(node) ((node) ? (tmpfs_node_t *)(node)->data : NULL)
#define FS_NODE(node) ((node) ? (node)->bp : NULL)
 
typedef enum {
TMPFS_NONE,
TMPFS_FILE,
TMPFS_DIRECTORY
} tmpfs_dentry_type_t;
 
/* forward declaration */
struct tmpfs_node;
 
typedef struct tmpfs_dentry {
link_t link; /**< Linkage for the list of siblings. */
struct tmpfs_node *node;/**< Back pointer to TMPFS node. */
char *name; /**< Name of dentry. */
} tmpfs_dentry_t;
 
typedef struct tmpfs_node {
fs_node_t *bp; /**< Back pointer to the FS node. */
fs_index_t index; /**< TMPFS node index. */
dev_handle_t dev_handle;/**< Device handle. */
link_t nh_link; /**< Nodes hash table link. */
tmpfs_dentry_type_t type;
unsigned lnkcnt; /**< Link count. */
size_t size; /**< File size if type is TMPFS_FILE. */
void *data; /**< File content's if type is TMPFS_FILE. */
link_t cs_head; /**< Head of child's siblings list. */
} tmpfs_node_t;
 
extern fs_reg_t tmpfs_reg;
 
extern libfs_ops_t tmpfs_libfs_ops;
 
extern bool tmpfs_init(void);
 
extern void tmpfs_mounted(ipc_callid_t, ipc_call_t *);
extern void tmpfs_mount(ipc_callid_t, ipc_call_t *);
extern void tmpfs_lookup(ipc_callid_t, ipc_call_t *);
extern void tmpfs_read(ipc_callid_t, ipc_call_t *);
extern void tmpfs_write(ipc_callid_t, ipc_call_t *);
extern void tmpfs_truncate(ipc_callid_t, ipc_call_t *);
extern void tmpfs_stat(ipc_callid_t, ipc_call_t *);
extern void tmpfs_close(ipc_callid_t, ipc_call_t *);
extern void tmpfs_destroy(ipc_callid_t, ipc_call_t *);
extern void tmpfs_open_node(ipc_callid_t, ipc_call_t *);
extern void tmpfs_sync(ipc_callid_t, ipc_call_t *);
 
extern bool tmpfs_restore(dev_handle_t);
 
#endif
 
/**
* @}
*/
/tags/0.4.1/uspace/srv/fs/tmpfs/tmpfs.c
0,0 → 1,171
/*
* Copyright (c) 2006 Martin Decky
* 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 tmpfs.c
* @brief File system driver for in-memory file system.
*
* Every instance of tmpfs exists purely in memory and has neither a disk layout
* nor any permanent storage (e.g. disk blocks). With each system reboot, data
* stored in a tmpfs file system is lost.
*/
 
#include "tmpfs.h"
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <async.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <libfs.h>
#include "../../vfs/vfs.h"
 
#define NAME "tmpfs"
 
 
vfs_info_t tmpfs_vfs_info = {
.name = "tmpfs",
};
 
fs_reg_t tmpfs_reg;
 
/**
* This connection fibril processes VFS requests from VFS.
*
* In order to support simultaneous VFS requests, our design is as follows.
* The connection fibril accepts VFS requests from VFS. If there is only one
* instance of the fibril, VFS will need to serialize all VFS requests it sends
* to FAT. To overcome this bottleneck, VFS can send TMPFS the
* IPC_M_CONNECT_ME_TO call. In that case, a new connection fibril will be
* created, which in turn will accept the call. Thus, a new phone will be
* opened for VFS.
*
* There are few issues with this arrangement. First, VFS can run out of
* available phones. In that case, VFS can close some other phones or use one
* phone for more serialized requests. Similarily, TMPFS can refuse to duplicate
* the connection. VFS should then just make use of already existing phones and
* route its requests through them. To avoid paying the fibril creation price
* upon each request, TMPFS might want to keep the connections open after the
* request has been completed.
*/
static void tmpfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
if (iid) {
/*
* This only happens for connections opened by
* IPC_M_CONNECT_ME_TO calls as opposed to callback connections
* created by IPC_M_CONNECT_TO_ME.
*/
ipc_answer_0(iid, EOK);
}
dprintf("VFS-TMPFS connection established.\n");
while (1) {
ipc_callid_t callid;
ipc_call_t call;
callid = async_get_call(&call);
switch (IPC_GET_METHOD(call)) {
case IPC_M_PHONE_HUNGUP:
return;
case VFS_OUT_MOUNTED:
tmpfs_mounted(callid, &call);
break;
case VFS_OUT_MOUNT:
tmpfs_mount(callid, &call);
break;
case VFS_OUT_LOOKUP:
tmpfs_lookup(callid, &call);
break;
case VFS_OUT_READ:
tmpfs_read(callid, &call);
break;
case VFS_OUT_WRITE:
tmpfs_write(callid, &call);
break;
case VFS_OUT_TRUNCATE:
tmpfs_truncate(callid, &call);
break;
case VFS_OUT_CLOSE:
tmpfs_close(callid, &call);
break;
case VFS_OUT_DESTROY:
tmpfs_destroy(callid, &call);
break;
case VFS_OUT_OPEN_NODE:
tmpfs_open_node(callid, &call);
break;
case VFS_OUT_STAT:
tmpfs_stat(callid, &call);
break;
case VFS_OUT_SYNC:
tmpfs_sync(callid, &call);
break;
default:
ipc_answer_0(callid, ENOTSUP);
break;
}
}
}
 
int main(int argc, char **argv)
{
printf(NAME ": HelenOS TMPFS file system server\n");
 
if (!tmpfs_init()) {
printf(NAME ": failed to initialize TMPFS\n");
return -1;
}
 
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 = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info,
tmpfs_connection);
if (rc != EOK) {
printf(NAME ": Failed to register file system (%d)\n", rc);
return rc;
}
 
printf(NAME ": Accepting connections\n");
async_manager();
/* not reached */
return 0;
}
 
/**
* @}
*/
/tags/0.4.1/uspace/srv/fs/tmpfs/tmpfs_dump.c
0,0 → 1,199
/*
* Copyright (c) 2008 Jakub Jermar
* Copyright (c) 2008 Martin Decky
* 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 tmpfs_dump.c
* @brief Support for loading TMPFS file system dump.
*/
 
#include "tmpfs.h"
#include "../../vfs/vfs.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <as.h>
#include <libblock.h>
#include <byteorder.h>
 
#define TMPFS_BLOCK_SIZE 1024
 
struct rdentry {
uint8_t type;
uint32_t len;
} __attribute__((packed));
 
static bool
tmpfs_restore_recursion(dev_handle_t dev, off_t *bufpos, size_t *buflen,
off_t *pos, fs_node_t *pfn)
{
struct rdentry entry;
libfs_ops_t *ops = &tmpfs_libfs_ops;
int rc;
do {
char *fname;
fs_node_t *fn;
tmpfs_node_t *nodep;
uint32_t size;
if (block_seqread(dev, bufpos, buflen, pos, &entry,
sizeof(entry), TMPFS_BLOCK_SIZE) != EOK)
return false;
entry.len = uint32_t_le2host(entry.len);
switch (entry.type) {
case TMPFS_NONE:
break;
case TMPFS_FILE:
fname = malloc(entry.len + 1);
if (fname == NULL)
return false;
fn = ops->create(dev, L_FILE);
if (fn == NULL) {
free(fname);
return false;
}
if (block_seqread(dev, bufpos, buflen, pos, fname,
entry.len, TMPFS_BLOCK_SIZE) != EOK) {
ops->destroy(fn);
free(fname);
return false;
}
fname[entry.len] = 0;
rc = ops->link(pfn, fn, fname);
if (rc != EOK) {
ops->destroy(fn);
free(fname);
return false;
}
free(fname);
if (block_seqread(dev, bufpos, buflen, pos, &size,
sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
return false;
size = uint32_t_le2host(size);
nodep = TMPFS_NODE(fn);
nodep->data = malloc(size);
if (nodep->data == NULL)
return false;
nodep->size = size;
if (block_seqread(dev, bufpos, buflen, pos, nodep->data,
size, TMPFS_BLOCK_SIZE) != EOK)
return false;
break;
case TMPFS_DIRECTORY:
fname = malloc(entry.len + 1);
if (fname == NULL)
return false;
fn = ops->create(dev, L_DIRECTORY);
if (fn == NULL) {
free(fname);
return false;
}
if (block_seqread(dev, bufpos, buflen, pos, fname,
entry.len, TMPFS_BLOCK_SIZE) != EOK) {
ops->destroy(fn);
free(fname);
return false;
}
fname[entry.len] = 0;
 
rc = ops->link(pfn, fn, fname);
if (rc != EOK) {
ops->destroy(fn);
free(fname);
return false;
}
free(fname);
if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
fn))
return false;
break;
default:
return false;
}
} while (entry.type != TMPFS_NONE);
return true;
}
 
bool tmpfs_restore(dev_handle_t dev)
{
libfs_ops_t *ops = &tmpfs_libfs_ops;
int rc;
 
rc = block_init(dev, TMPFS_BLOCK_SIZE);
if (rc != EOK)
return false;
off_t bufpos = 0;
size_t buflen = 0;
off_t pos = 0;
char tag[6];
if (block_seqread(dev, &bufpos, &buflen, &pos, tag, 5,
TMPFS_BLOCK_SIZE) != EOK)
goto error;
tag[5] = 0;
if (str_cmp(tag, "TMPFS") != 0)
goto error;
if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
ops->root_get(dev)))
goto error;
block_fini(dev);
return true;
error:
block_fini(dev);
return false;
}
 
/**
* @}
*/
/tags/0.4.1/uspace/srv/fs/tmpfs/Makefile
0,0 → 1,84
#
# Copyright (c) 2006 Martin Decky
# 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.
#
 
## Setup toolchain
#
 
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) -I $(LIBBLOCK_PREFIX)
 
LIBS = \
$(LIBFS_PREFIX)/libfs.a \
$(LIBBLOCK_PREFIX)/libblock.a \
$(LIBC_PREFIX)/libc.a
 
## Sources
#
 
OUTPUT = tmpfs
SOURCES = \
tmpfs.c \
tmpfs_ops.c \
tmpfs_dump.c
 
OBJECTS := $(addsuffix .o,$(basename $(SOURCES)))
 
.PHONY: all clean depend disasm
 
all: $(OUTPUT) $(OUTPUT).disasm
 
-include Makefile.depend
 
clean:
-rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend $(OBJECTS)
 
depend:
$(CC) $(DEFS) $(CFLAGS) -M $(SOURCES) > Makefile.depend
 
$(OUTPUT): $(OBJECTS) $(LIBS)
$(LD) -T $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map
 
disasm: $(OUTPUT).disasm
 
$(OUTPUT).disasm: $(OUTPUT)
$(OBJDUMP) -d $< > $@
 
%.o: %.S
$(CC) $(DEFS) $(AFLAGS) $(CFLAGS) -D__ASM__ -c $< -o $@
 
%.o: %.s
$(AS) $(AFLAGS) $< -o $@
 
%.o: %.c
$(CC) $(DEFS) $(CFLAGS) -c $< -o $@