WebSVN – HelenOS – Diff – /branches/dynload/uspace/srv/fs/tmpfs/tmpfs_ops.c


/*
 * 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 <libadt/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 DENTRIES_BUCKETS    256
 
#define NAMES_BUCKETS       4
 
 
/** 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 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(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 *);
 
/* Implementation of helper functions. */
static fs_index_t tmpfs_index_get(void *nodep)
{
    return ((tmpfs_dentry_t *) nodep)->index;
}
 
static size_t tmpfs_size_get(void *nodep)
{
    return ((tmpfs_dentry_t *) nodep)->size;
}
 
static unsigned tmpfs_lnkcnt_get(void *nodep)
{
    return ((tmpfs_dentry_t *) nodep)->lnkcnt;
}
 
static bool tmpfs_has_children(void *nodep)
{
    return ((tmpfs_dentry_t *) nodep)->child != NULL;
}
 
static void *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(void *nodep)
{
    return ((tmpfs_dentry_t *) nodep)->type == TMPFS_DIRECTORY;
}
 
static bool tmpfs_is_file(void *nodep)
{
    return ((tmpfs_dentry_t *) nodep)->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 directory entries. */
hash_table_t dentries;
 
#define DENTRIES_KEY_INDEX  0
#define DENTRIES_KEY_DEV    1
 
/* Implementation of hash table interface for the dentries hash table. */
static hash_index_t dentries_hash(unsigned long key[])
{
    return key[DENTRIES_KEY_INDEX] % DENTRIES_BUCKETS;
}
 
static int dentries_compare(unsigned long key[], hash_count_t keys,
    link_t *item)
{
    tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t,
        dh_link);
    return (dentry->index == key[DENTRIES_KEY_INDEX] &&
        dentry->dev_handle == key[DENTRIES_KEY_DEV]);
}
 
static void dentries_remove_callback(link_t *item)
{
}
 
/** TMPFS dentries hash table operations. */
hash_table_operations_t dentries_ops = {
    .hash = dentries_hash,
    .compare = dentries_compare,
    .remove_callback = dentries_remove_callback
};
 
 
 
typedef struct {
    char *name;
    tmpfs_dentry_t *parent;
    link_t link;
} tmpfs_name_t;
 
/* Implementation of hash table interface for the names hash table. */
static hash_index_t names_hash(unsigned long *key)
{
    tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) *key;
    return dentry->index % NAMES_BUCKETS;
}
 
static int names_compare(unsigned long *key, hash_count_t keys, link_t *item)
{
    tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) *key;
    tmpfs_name_t *namep = hash_table_get_instance(item, tmpfs_name_t,
        link);
    return dentry == namep->parent;
}
 
static void names_remove_callback(link_t *item)
{
    tmpfs_name_t *namep = hash_table_get_instance(item, tmpfs_name_t,
        link);
    free(namep->name);
    free(namep);
}
 
/** TMPFS node names hash table operations. */
static hash_table_operations_t names_ops = {
    .hash = names_hash,
    .compare = names_compare,
    .remove_callback = names_remove_callback
};
 
static void tmpfs_name_initialize(tmpfs_name_t *namep)
{
    namep->name = NULL;
    namep->parent = NULL;
    link_initialize(&namep->link);
}
 
static bool tmpfs_dentry_initialize(tmpfs_dentry_t *dentry)
{
    dentry->index = 0;
    dentry->dev_handle = 0;
    dentry->sibling = NULL;
    dentry->child = NULL;
    dentry->type = TMPFS_NONE;
    dentry->lnkcnt = 0;
    dentry->size = 0;
    dentry->data = NULL;
    link_initialize(&dentry->dh_link);
    return (bool)hash_table_create(&dentry->names, NAMES_BUCKETS, 1,
        &names_ops);
}
 
bool tmpfs_init(void)
{
    if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 2, &dentries_ops))
        return false;
   
    return true;
}
 
static bool tmpfs_instance_init(dev_handle_t dev_handle)
{
    tmpfs_dentry_t *root;
   
    root = (tmpfs_dentry_t *) tmpfs_create_node(dev_handle, L_DIRECTORY);
    if (!root)
 
        return false;
 
    root->lnkcnt = 0;   /* FS root is not linked */
    return true;
}
 
/** Compare one component of path to a directory entry.
 *
 * @param parentp   Pointer to node from which we descended.
 * @param childp    Pointer to node to compare the path component with.
 * @param component Array of characters holding component name.
 *
 * @return      True on match, false otherwise.
 */
static bool
tmpfs_match_one(tmpfs_dentry_t *parentp, tmpfs_dentry_t *childp,
    const char *component)
{
    unsigned long key = (unsigned long) parentp;
    link_t *hlp = hash_table_find(&childp->names, &key);
    assert(hlp);
    tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t, link);
    return !str_cmp(namep->name, component);
}
 
void *tmpfs_match(void *prnt, const char *component)
{
    tmpfs_dentry_t *parentp = (tmpfs_dentry_t *) prnt;
    tmpfs_dentry_t *childp = parentp->child;
 
    while (childp && !tmpfs_match_one(parentp, childp, component))
        childp = childp->sibling;
 
    return (void *) childp;
}
 
void *
tmpfs_node_get(dev_handle_t dev_handle, fs_index_t index)
{
    unsigned long key[] = {
        [DENTRIES_KEY_INDEX] = index,
        [DENTRIES_KEY_DEV] = dev_handle
    };
    link_t *lnk = hash_table_find(&dentries, key);
    if (!lnk)
        return NULL;
    return hash_table_get_instance(lnk, tmpfs_dentry_t, dh_link);
}
 
void tmpfs_node_put(void *node)
{
    /* nothing to do */
}
 
void *tmpfs_create_node(dev_handle_t dev_handle, int lflag)
{
    assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
 
    tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t));
    if (!node)
        return NULL;
 
    if (!tmpfs_dentry_initialize(node)) {
        free(node);
        return NULL;
    }
    if (!tmpfs_root_get(dev_handle))
        node->index = TMPFS_SOME_ROOT;
    else
        node->index = tmpfs_next_index++;
    node->dev_handle = dev_handle;
    if (lflag & L_DIRECTORY)
        node->type = TMPFS_DIRECTORY;
    else
        node->type = TMPFS_FILE;
 
    /* Insert the new node into the dentry hash table. */
    unsigned long key[] = {
        [DENTRIES_KEY_INDEX] = node->index,
        [DENTRIES_KEY_DEV] = node->dev_handle
    };
    hash_table_insert(&dentries, key, &node->dh_link);
    return (void *) node;
}
 
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;
 
    assert(parentp->type == TMPFS_DIRECTORY);
 
    tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));
    if (!namep)
        return ENOMEM;
    tmpfs_name_initialize(namep);
    size_t size = str_size(nm);
    namep->name = malloc(size + 1);
    if (!namep->name) {
        free(namep);
        return ENOMEM;
    }
    str_cpy(namep->name, size + 1, nm);
    namep->parent = parentp;
   
    childp->lnkcnt++;
 
    unsigned long key = (unsigned long) parentp;
    hash_table_insert(&childp->names, &key, &namep->link);
 
    /* Insert the new node into the namespace. */
    if (parentp->child) {
        tmpfs_dentry_t *tmp = parentp->child;
        while (tmp->sibling)
            tmp = tmp->sibling;
        tmp->sibling = childp;
    } else {
        parentp->child = childp;
    }
 
    return EOK;
}
 
int tmpfs_unlink_node(void *prnt, void *chld)
{
    tmpfs_dentry_t *parentp = (tmpfs_dentry_t *)prnt;
    tmpfs_dentry_t *childp = (tmpfs_dentry_t *)chld;
 
    if (!parentp)
        return EBUSY;
 
    if (childp->child)
        return ENOTEMPTY;
 
    if (parentp->child == childp) {
        parentp->child = childp->sibling;
    } else {
        /* TODO: consider doubly linked list for organizing siblings. */
        tmpfs_dentry_t *tmp = parentp->child;
        while (tmp->sibling != childp)
            tmp = tmp->sibling;
        tmp->sibling = childp->sibling;
    }
    childp->sibling = NULL;
 
    unsigned long key = (unsigned long) parentp;
    hash_table_remove(&childp->names, &key, 1);
 
    childp->lnkcnt--;
 
    return EOK;
}
 
int tmpfs_destroy_node(void *nodep)
{
    tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep;
   
    assert(!dentry->lnkcnt);
    assert(!dentry->child);
    assert(!dentry->sibling);
 
    unsigned long key[] = {
        [DENTRIES_KEY_INDEX] = dentry->index,
        [DENTRIES_KEY_DEV] = dentry->dev_handle
    };
    hash_table_remove(&dentries, key, 2);
 
    hash_table_destroy(&dentry->names);
 
    if (dentry->type == TMPFS_FILE)
        free(dentry->data);
    free(dentry);
    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_dentry_t *root = tmpfs_root_get(dev_handle);
    if (str_cmp(opts, "restore") == 0) {
        if (tmpfs_restore(dev_handle))
            ipc_answer_3(rid, EOK, root->index, root->size,
                root->lnkcnt);
        else
            ipc_answer_0(rid, ELIMIT);
    } else {
        ipc_answer_3(rid, EOK, root->index, root->size, root->lnkcnt);
    }
}
 
void tmpfs_mount(ipc_callid_t rid, ipc_call_t *request)
{
    dev_handle_t mp_dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
    fs_index_t mp_index = (fs_index_t) IPC_GET_ARG2(*request);
    fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*request);
    dev_handle_t mr_dev_handle = (dev_handle_t) IPC_GET_ARG4(*request);
   
    ipc_answer_0(rid, ENOTSUP);
}
 
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 dentry.
     */
    link_t *hlp;
    unsigned long key[] = {
        [DENTRIES_KEY_INDEX] = index,
        [DENTRIES_KEY_DEV] = dev_handle,
    };
    hlp = hash_table_find(&dentries, key);
    if (!hlp) {
        ipc_answer_0(rid, ENOENT);
        return;
    }
    tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t,
        dh_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 (dentry->type == TMPFS_FILE) {
        bytes = max(0, min(dentry->size - pos, size));
        (void) ipc_data_read_finalize(callid, dentry->data + pos,
            bytes);
    } else {
        int i;
        tmpfs_dentry_t *cur;
       
        assert(dentry->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, cur = dentry->child; i < pos && cur; i++,
            cur = cur->sibling)
            ;
 
        if (!cur) {
            ipc_answer_0(callid, ENOENT);
            ipc_answer_1(rid, ENOENT, 0);
            return;
        }
 
        unsigned long key = (unsigned long) dentry;
        link_t *hlp = hash_table_find(&cur->names, &key);
        assert(hlp);
        tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t,
            link);
 
        (void) ipc_data_read_finalize(callid, namep->name,
            str_size(namep->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 dentry.
     */
    link_t *hlp;
    unsigned long key[] = {
        [DENTRIES_KEY_INDEX] = index,
        [DENTRIES_KEY_DEV] = dev_handle
    };
    hlp = hash_table_find(&dentries, key);
    if (!hlp) {
        ipc_answer_0(rid, ENOENT);
        return;
    }
    tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t,
        dh_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 <= dentry->size) {
        /* The file size is not changing. */
        (void) ipc_data_write_finalize(callid, dentry->data + pos, size);
        ipc_answer_2(rid, EOK, size, dentry->size);
        return;
    }
    size_t delta = (pos + size) - dentry->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(dentry->data, dentry->size + delta);
    if (!newdata) {
        ipc_answer_0(callid, ENOMEM);
        ipc_answer_2(rid, EOK, 0, dentry->size);
        return;
    }
    /* Clear any newly allocated memory in order to emulate gaps. */
    memset(newdata + dentry->size, 0, delta);
    dentry->size += delta;
    dentry->data = newdata;
    (void) ipc_data_write_finalize(callid, dentry->data + pos, size);
    ipc_answer_2(rid, EOK, size, dentry->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 dentry.
     */
    link_t *hlp;
    unsigned long key[] = {
        [DENTRIES_KEY_INDEX] = index,
        [DENTRIES_KEY_DEV] = dev_handle
    };
    hlp = hash_table_find(&dentries, key);
    if (!hlp) {
        ipc_answer_0(rid, ENOENT);
        return;
    }
    tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t,
        dh_link);
 
    if (size == dentry->size) {
        ipc_answer_0(rid, EOK);
        return;
    }
 
    void *newdata = realloc(dentry->data, size);
    if (!newdata) {
        ipc_answer_0(rid, ENOMEM);
        return;
    }
    if (size > dentry->size) {
        size_t delta = size - dentry->size;
        memset(newdata + dentry->size, 0, delta);
    }
    dentry->size = size;
    dentry->data = newdata;
    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[] = {
        [DENTRIES_KEY_INDEX] = index,
        [DENTRIES_KEY_DEV] = dev_handle
    };
    hlp = hash_table_find(&dentries, key);
    if (!hlp) {
        ipc_answer_0(rid, ENOENT);
        return;
    }
    tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t,
        dh_link);
    rc = tmpfs_destroy_node(dentry);
    ipc_answer_0(rid, rc);
}
 
/**
 * @}
 */
 

Rev 3674	Rev 4348
1	/*	1	/*
2	* Copyright (c) 2008 Jakub Jermar	2	* Copyright (c) 2008 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup fs	29	/** @addtogroup fs
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file tmpfs_ops.c	34	* @file tmpfs_ops.c
35	* @brief Implementation of VFS operations for the TMPFS file system	35	* @brief Implementation of VFS operations for the TMPFS file system
36	* server.	36	* server.
37	*/	37	*/
38		38
39	#include "tmpfs.h"	39	#include "tmpfs.h"
40	#include "../../vfs/vfs.h"	40	#include "../../vfs/vfs.h"
41	#include <ipc/ipc.h>	41	#include <ipc/ipc.h>
42	#include <async.h>	42	#include <async.h>
43	#include <errno.h>	43	#include <errno.h>
44	#include <atomic.h>	44	#include <atomic.h>
45	#include <stdlib.h>	45	#include <stdlib.h>
46	#include <string.h>	46	#include <string.h>
47	#include <stdio.h>	47	#include <stdio.h>
48	#include <assert.h>	48	#include <assert.h>
49	#include <sys/types.h>	49	#include <sys/types.h>
50	#include <libadt/hash_table.h>	50	#include <libadt/hash_table.h>
51	#include <as.h>	51	#include <as.h>
52	#include <libfs.h>	52	#include <libfs.h>
53		53
54	#define min(a, b) ((a) < (b) ? (a) : (b))	54	#define min(a, b) ((a) < (b) ? (a) : (b))
55	#define max(a, b) ((a) > (b) ? (a) : (b))	55	#define max(a, b) ((a) > (b) ? (a) : (b))
56		56
57	#define DENTRIES_BUCKETS 256	57	#define DENTRIES_BUCKETS 256
58		58
59	#define NAMES_BUCKETS 4	59	#define NAMES_BUCKETS 4
60		60
61	/*	-
62	* For now, we don't distinguish between different dev_handles/instances. All	61	/** All root nodes have index 0. */
-		62	#define TMPFS_SOME_ROOT 0
63	* requests resolve to the only instance, rooted in the following variable.	63	/** Global counter for assigning node indices. Shared by all instances. */
64	*/	-
65	static tmpfs_dentry_t *root;	64	fs_index_t tmpfs_next_index = 1;
66		-
67	#define TMPFS_DEV 0 /*< Dummy device handle for TMPFS /	-
68		65
69	/*	66	/*
70	* Implementation of the libfs interface.	67	* Implementation of the libfs interface.
71	*/	68	*/
72		69
73	/* Forward declarations of static functions. */	70	/* Forward declarations of static functions. */
74	static void tmpfs_match(void , const char *);	71	static void tmpfs_match(void , const char *);
75	static void *tmpfs_node_get(dev_handle_t, fs_index_t);	72	static void *tmpfs_node_get(dev_handle_t, fs_index_t);
76	static void tmpfs_node_put(void *);	73	static void tmpfs_node_put(void *);
77	static void *tmpfs_create_node(dev_handle_t, int);	74	static void *tmpfs_create_node(dev_handle_t, int);
78	static int tmpfs_link_node(void , void , const char *);	75	static int tmpfs_link_node(void , void , const char *);
79	static int tmpfs_unlink_node(void , void );	76	static int tmpfs_unlink_node(void , void );
80	static int tmpfs_destroy_node(void *);	77	static int tmpfs_destroy_node(void *);
81		78
82	/* Implementation of helper functions. */	79	/* Implementation of helper functions. */
83	static fs_index_t tmpfs_index_get(void *nodep)	80	static fs_index_t tmpfs_index_get(void *nodep)
84	{	81	{
85	return ((tmpfs_dentry_t *) nodep)->index;	82	return ((tmpfs_dentry_t *) nodep)->index;
86	}	83	}
87		84
88	static size_t tmpfs_size_get(void *nodep)	85	static size_t tmpfs_size_get(void *nodep)
89	{	86	{
90	return ((tmpfs_dentry_t *) nodep)->size;	87	return ((tmpfs_dentry_t *) nodep)->size;
91	}	88	}
92		89
93	static unsigned tmpfs_lnkcnt_get(void *nodep)	90	static unsigned tmpfs_lnkcnt_get(void *nodep)
94	{	91	{
95	return ((tmpfs_dentry_t *) nodep)->lnkcnt;	92	return ((tmpfs_dentry_t *) nodep)->lnkcnt;
96	}	93	}
97		94
98	static bool tmpfs_has_children(void *nodep)	95	static bool tmpfs_has_children(void *nodep)
99	{	96	{
100	return ((tmpfs_dentry_t *) nodep)->child != NULL;	97	return ((tmpfs_dentry_t *) nodep)->child != NULL;
101	}	98	}
102		99
103	static void *tmpfs_root_get(dev_handle_t dev_handle)	100	static void *tmpfs_root_get(dev_handle_t dev_handle)
104	{	101	{
105	return root;	102	return tmpfs_node_get(dev_handle, TMPFS_SOME_ROOT);
106	}	103	}
107		104
108	static char tmpfs_plb_get_char(unsigned pos)	105	static char tmpfs_plb_get_char(unsigned pos)
109	{	106	{
110	return tmpfs_reg.plb_ro[pos % PLB_SIZE];	107	return tmpfs_reg.plb_ro[pos % PLB_SIZE];
111	}	108	}
112		109
113	static bool tmpfs_is_directory(void *nodep)	110	static bool tmpfs_is_directory(void *nodep)
114	{	111	{
115	return ((tmpfs_dentry_t *) nodep)->type == TMPFS_DIRECTORY;	112	return ((tmpfs_dentry_t *) nodep)->type == TMPFS_DIRECTORY;
116	}	113	}
117		114
118	static bool tmpfs_is_file(void *nodep)	115	static bool tmpfs_is_file(void *nodep)
119	{	116	{
120	return ((tmpfs_dentry_t *) nodep)->type == TMPFS_FILE;	117	return ((tmpfs_dentry_t *) nodep)->type == TMPFS_FILE;
121	}	118	}
122		119
123	/** libfs operations */	120	/** libfs operations */
124	libfs_ops_t tmpfs_libfs_ops = {	121	libfs_ops_t tmpfs_libfs_ops = {
125	.match = tmpfs_match,	122	.match = tmpfs_match,
126	.node_get = tmpfs_node_get,	123	.node_get = tmpfs_node_get,
127	.node_put = tmpfs_node_put,	124	.node_put = tmpfs_node_put,
128	.create = tmpfs_create_node,	125	.create = tmpfs_create_node,
129	.destroy = tmpfs_destroy_node,	126	.destroy = tmpfs_destroy_node,
130	.link = tmpfs_link_node,	127	.link = tmpfs_link_node,
131	.unlink = tmpfs_unlink_node,	128	.unlink = tmpfs_unlink_node,
132	.index_get = tmpfs_index_get,	129	.index_get = tmpfs_index_get,
133	.size_get = tmpfs_size_get,	130	.size_get = tmpfs_size_get,
134	.lnkcnt_get = tmpfs_lnkcnt_get,	131	.lnkcnt_get = tmpfs_lnkcnt_get,
135	.has_children = tmpfs_has_children,	132	.has_children = tmpfs_has_children,
136	.root_get = tmpfs_root_get,	133	.root_get = tmpfs_root_get,
137	.plb_get_char = tmpfs_plb_get_char,	134	.plb_get_char = tmpfs_plb_get_char,
138	.is_directory = tmpfs_is_directory,	135	.is_directory = tmpfs_is_directory,
139	.is_file = tmpfs_is_file	136	.is_file = tmpfs_is_file
140	};	137	};
141		138
142	/** Hash table of all directory entries. */	139	/** Hash table of all directory entries. */
143	hash_table_t dentries;	140	hash_table_t dentries;
144		141
-		142	#define DENTRIES_KEY_INDEX 0
-		143	#define DENTRIES_KEY_DEV 1
-		144
145	/* Implementation of hash table interface for the dentries hash table. */	145	/* Implementation of hash table interface for the dentries hash table. */
146	static hash_index_t dentries_hash(unsigned long *key)	146	static hash_index_t dentries_hash(unsigned long key[])
147	{	147	{
148	return *key % DENTRIES_BUCKETS;	148	return key[DENTRIES_KEY_INDEX] % DENTRIES_BUCKETS;
149	}	149	}
150		150
151	static int dentries_compare(unsigned long *key, hash_count_t keys,	151	static int dentries_compare(unsigned long key[], hash_count_t keys,
152	link_t *item)	152	link_t *item)
153	{	153	{
154	tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t,	154	tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t,
155	dh_link);	155	dh_link);
156	return dentry->index == *key;	156	return (dentry->index == key[DENTRIES_KEY_INDEX] &&
-		157	dentry->dev_handle == key[DENTRIES_KEY_DEV]);
157	}	158	}
158		159
159	static void dentries_remove_callback(link_t *item)	160	static void dentries_remove_callback(link_t *item)
160	{	161	{
161	}	162	}
162		163
163	/** TMPFS dentries hash table operations. */	164	/** TMPFS dentries hash table operations. */
164	hash_table_operations_t dentries_ops = {	165	hash_table_operations_t dentries_ops = {
165	.hash = dentries_hash,	166	.hash = dentries_hash,
166	.compare = dentries_compare,	167	.compare = dentries_compare,
167	.remove_callback = dentries_remove_callback	168	.remove_callback = dentries_remove_callback
168	};	169	};
169		170
170	fs_index_t tmpfs_next_index = 1;	-
171		-
172	typedef struct {	171	typedef struct {
173	char *name;	172	char *name;
174	tmpfs_dentry_t *parent;	173	tmpfs_dentry_t *parent;
175	link_t link;	174	link_t link;
176	} tmpfs_name_t;	175	} tmpfs_name_t;
177		176
178	/* Implementation of hash table interface for the names hash table. */	177	/* Implementation of hash table interface for the names hash table. */
179	static hash_index_t names_hash(unsigned long *key)	178	static hash_index_t names_hash(unsigned long *key)
180	{	179	{
181	tmpfs_dentry_t dentry = (tmpfs_dentry_t ) *key;	180	tmpfs_dentry_t dentry = (tmpfs_dentry_t ) *key;
182	return dentry->index % NAMES_BUCKETS;	181	return dentry->index % NAMES_BUCKETS;
183	}	182	}
184		183
185	static int names_compare(unsigned long key, hash_count_t keys, link_t item)	184	static int names_compare(unsigned long key, hash_count_t keys, link_t item)
186	{	185	{
187	tmpfs_dentry_t dentry = (tmpfs_dentry_t ) *key;	186	tmpfs_dentry_t dentry = (tmpfs_dentry_t ) *key;
188	tmpfs_name_t *namep = hash_table_get_instance(item, tmpfs_name_t,	187	tmpfs_name_t *namep = hash_table_get_instance(item, tmpfs_name_t,
189	link);	188	link);
190	return dentry == namep->parent;	189	return dentry == namep->parent;
191	}	190	}
192		191
193	static void names_remove_callback(link_t *item)	192	static void names_remove_callback(link_t *item)
194	{	193	{
195	tmpfs_name_t *namep = hash_table_get_instance(item, tmpfs_name_t,	194	tmpfs_name_t *namep = hash_table_get_instance(item, tmpfs_name_t,
196	link);	195	link);
197	free(namep->name);	196	free(namep->name);
198	free(namep);	197	free(namep);
199	}	198	}
200		199
201	/** TMPFS node names hash table operations. */	200	/** TMPFS node names hash table operations. */
202	static hash_table_operations_t names_ops = {	201	static hash_table_operations_t names_ops = {
203	.hash = names_hash,	202	.hash = names_hash,
204	.compare = names_compare,	203	.compare = names_compare,
205	.remove_callback = names_remove_callback	204	.remove_callback = names_remove_callback
206	};	205	};
207		206
208	static void tmpfs_name_initialize(tmpfs_name_t *namep)	207	static void tmpfs_name_initialize(tmpfs_name_t *namep)
209	{	208	{
210	namep->name = NULL;	209	namep->name = NULL;
211	namep->parent = NULL;	210	namep->parent = NULL;
212	link_initialize(&namep->link);	211	link_initialize(&namep->link);
213	}	212	}
214		213
215	static bool tmpfs_dentry_initialize(tmpfs_dentry_t *dentry)	214	static bool tmpfs_dentry_initialize(tmpfs_dentry_t *dentry)
216	{	215	{
217	dentry->index = 0;	216	dentry->index = 0;
-		217	dentry->dev_handle = 0;
218	dentry->sibling = NULL;	218	dentry->sibling = NULL;
219	dentry->child = NULL;	219	dentry->child = NULL;
220	dentry->type = TMPFS_NONE;	220	dentry->type = TMPFS_NONE;
221	dentry->lnkcnt = 0;	221	dentry->lnkcnt = 0;
222	dentry->size = 0;	222	dentry->size = 0;
223	dentry->data = NULL;	223	dentry->data = NULL;
224	link_initialize(&dentry->dh_link);	224	link_initialize(&dentry->dh_link);
225	return (bool)hash_table_create(&dentry->names, NAMES_BUCKETS, 1,	225	return (bool)hash_table_create(&dentry->names, NAMES_BUCKETS, 1,
226	&names_ops);	226	&names_ops);
227	}	227	}
228		228
229	static bool tmpfs_init(void)	229	bool tmpfs_init(void)
230	{	230	{
231	if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 1, &dentries_ops))	231	if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 2, &dentries_ops))
232	return false;	232	return false;
-		233
-		234	return true;
-		235	}
-		236
-		237	static bool tmpfs_instance_init(dev_handle_t dev_handle)
-		238	{
-		239	tmpfs_dentry_t *root;
-		240
233	root = (tmpfs_dentry_t *) tmpfs_create_node(TMPFS_DEV, L_DIRECTORY);	241	root = (tmpfs_dentry_t *) tmpfs_create_node(dev_handle, L_DIRECTORY);
234	if (!root) {	242	if (!root)
235	hash_table_destroy(&dentries);	-
236	return false;	243	return false;
237	}	-
238	root->lnkcnt = 0; /* FS root is not linked */	244	root->lnkcnt = 0; /* FS root is not linked */
239	return true;	245	return true;
240	}	246	}
241		247
242	/** Compare one component of path to a directory entry.	248	/** Compare one component of path to a directory entry.
243	*	249	*
244	* @param parentp Pointer to node from which we descended.	250	* @param parentp Pointer to node from which we descended.
245	* @param childp Pointer to node to compare the path component with.	251	* @param childp Pointer to node to compare the path component with.
246	* @param component Array of characters holding component name.	252	* @param component Array of characters holding component name.
247	*	253	*
248	* @return True on match, false otherwise.	254	* @return True on match, false otherwise.
249	*/	255	*/
250	static bool	256	static bool
251	tmpfs_match_one(tmpfs_dentry_t parentp, tmpfs_dentry_t childp,	257	tmpfs_match_one(tmpfs_dentry_t parentp, tmpfs_dentry_t childp,
252	const char *component)	258	const char *component)
253	{	259	{
254	unsigned long key = (unsigned long) parentp;	260	unsigned long key = (unsigned long) parentp;
255	link_t *hlp = hash_table_find(&childp->names, &key);	261	link_t *hlp = hash_table_find(&childp->names, &key);
256	assert(hlp);	262	assert(hlp);
257	tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t, link);	263	tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t, link);
258	return !strcmp(namep->name, component);	264	return !str_cmp(namep->name, component);
259	}	265	}
260		266
261	void tmpfs_match(void prnt, const char *component)	267	void tmpfs_match(void prnt, const char *component)
262	{	268	{
263	tmpfs_dentry_t parentp = (tmpfs_dentry_t ) prnt;	269	tmpfs_dentry_t parentp = (tmpfs_dentry_t ) prnt;
264	tmpfs_dentry_t *childp = parentp->child;	270	tmpfs_dentry_t *childp = parentp->child;
265		271
266	while (childp && !tmpfs_match_one(parentp, childp, component))	272	while (childp && !tmpfs_match_one(parentp, childp, component))
267	childp = childp->sibling;	273	childp = childp->sibling;
268		274
269	return (void *) childp;	275	return (void *) childp;
270	}	276	}
271		277
272	void *	278	void *
273	tmpfs_node_get(dev_handle_t dev_handle, fs_index_t index)	279	tmpfs_node_get(dev_handle_t dev_handle, fs_index_t index)
274	{	280	{
275	unsigned long key = index;	281	unsigned long key[] = {
-		282	[DENTRIES_KEY_INDEX] = index,
-		283	[DENTRIES_KEY_DEV] = dev_handle
-		284	};
276	link_t *lnk = hash_table_find(&dentries, &key);	285	link_t *lnk = hash_table_find(&dentries, key);
277	if (!lnk)	286	if (!lnk)
278	return NULL;	287	return NULL;
279	return hash_table_get_instance(lnk, tmpfs_dentry_t, dh_link);	288	return hash_table_get_instance(lnk, tmpfs_dentry_t, dh_link);
280	}	289	}
281		290
282	void tmpfs_node_put(void *node)	291	void tmpfs_node_put(void *node)
283	{	292	{
284	/* nothing to do */	293	/* nothing to do */
285	}	294	}
286		295
287	void *tmpfs_create_node(dev_handle_t dev_handle, int lflag)	296	void *tmpfs_create_node(dev_handle_t dev_handle, int lflag)
288	{	297	{
289	assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));	298	assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
290		299
291	tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t));	300	tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t));
292	if (!node)	301	if (!node)
293	return NULL;	302	return NULL;
294		303
295	if (!tmpfs_dentry_initialize(node)) {	304	if (!tmpfs_dentry_initialize(node)) {
296	free(node);	305	free(node);
297	return NULL;	306	return NULL;
298	}	307	}
-		308	if (!tmpfs_root_get(dev_handle))
-		309	node->index = TMPFS_SOME_ROOT;
-		310	else
299	node->index = tmpfs_next_index++;	311	node->index = tmpfs_next_index++;
-		312	node->dev_handle = dev_handle;
300	if (lflag & L_DIRECTORY)	313	if (lflag & L_DIRECTORY)
301	node->type = TMPFS_DIRECTORY;	314	node->type = TMPFS_DIRECTORY;
302	else	315	else
303	node->type = TMPFS_FILE;	316	node->type = TMPFS_FILE;
304		317
305	/* Insert the new node into the dentry hash table. */	318	/* Insert the new node into the dentry hash table. */
306	unsigned long key = node->index;	319	unsigned long key[] = {
-		320	[DENTRIES_KEY_INDEX] = node->index,
-		321	[DENTRIES_KEY_DEV] = node->dev_handle
-		322	};
307	hash_table_insert(&dentries, &key, &node->dh_link);	323	hash_table_insert(&dentries, key, &node->dh_link);
308	return (void *) node;	324	return (void *) node;
309	}	325	}
310		326
311	int tmpfs_link_node(void prnt, void chld, const char *nm)	327	int tmpfs_link_node(void prnt, void chld, const char *nm)
312	{	328	{
313	tmpfs_dentry_t parentp = (tmpfs_dentry_t ) prnt;	329	tmpfs_dentry_t parentp = (tmpfs_dentry_t ) prnt;
314	tmpfs_dentry_t childp = (tmpfs_dentry_t ) chld;	330	tmpfs_dentry_t childp = (tmpfs_dentry_t ) chld;
315		331
316	assert(parentp->type == TMPFS_DIRECTORY);	332	assert(parentp->type == TMPFS_DIRECTORY);
317		333
318	tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));	334	tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));
319	if (!namep)	335	if (!namep)
320	return ENOMEM;	336	return ENOMEM;
321	tmpfs_name_initialize(namep);	337	tmpfs_name_initialize(namep);
322	size_t len = strlen(nm);	338	size_t size = str_size(nm);
323	namep->name = malloc(len + 1);	339	namep->name = malloc(size + 1);
324	if (!namep->name) {	340	if (!namep->name) {
325	free(namep);	341	free(namep);
326	return ENOMEM;	342	return ENOMEM;
327	}	343	}
328	strcpy(namep->name, nm);	344	str_cpy(namep->name, size + 1, nm);
329	namep->parent = parentp;	345	namep->parent = parentp;
330		346
331	childp->lnkcnt++;	347	childp->lnkcnt++;
332		348
333	unsigned long key = (unsigned long) parentp;	349	unsigned long key = (unsigned long) parentp;
334	hash_table_insert(&childp->names, &key, &namep->link);	350	hash_table_insert(&childp->names, &key, &namep->link);
335		351
336	/* Insert the new node into the namespace. */	352	/* Insert the new node into the namespace. */
337	if (parentp->child) {	353	if (parentp->child) {
338	tmpfs_dentry_t *tmp = parentp->child;	354	tmpfs_dentry_t *tmp = parentp->child;
339	while (tmp->sibling)	355	while (tmp->sibling)
340	tmp = tmp->sibling;	356	tmp = tmp->sibling;
341	tmp->sibling = childp;	357	tmp->sibling = childp;
342	} else {	358	} else {
343	parentp->child = childp;	359	parentp->child = childp;
344	}	360	}
345		361
346	return EOK;	362	return EOK;
347	}	363	}
348		364
349	int tmpfs_unlink_node(void prnt, void chld)	365	int tmpfs_unlink_node(void prnt, void chld)
350	{	366	{
351	tmpfs_dentry_t parentp = (tmpfs_dentry_t )prnt;	367	tmpfs_dentry_t parentp = (tmpfs_dentry_t )prnt;
352	tmpfs_dentry_t childp = (tmpfs_dentry_t )chld;	368	tmpfs_dentry_t childp = (tmpfs_dentry_t )chld;
353		369
354	if (!parentp)	370	if (!parentp)
355	return EBUSY;	371	return EBUSY;
356		372
357	if (childp->child)	373	if (childp->child)
358	return ENOTEMPTY;	374	return ENOTEMPTY;
359		375
360	if (parentp->child == childp) {	376	if (parentp->child == childp) {
361	parentp->child = childp->sibling;	377	parentp->child = childp->sibling;
362	} else {	378	} else {
363	/* TODO: consider doubly linked list for organizing siblings. */	379	/* TODO: consider doubly linked list for organizing siblings. */
364	tmpfs_dentry_t *tmp = parentp->child;	380	tmpfs_dentry_t *tmp = parentp->child;
365	while (tmp->sibling != childp)	381	while (tmp->sibling != childp)
366	tmp = tmp->sibling;	382	tmp = tmp->sibling;
367	tmp->sibling = childp->sibling;	383	tmp->sibling = childp->sibling;
368	}	384	}
369	childp->sibling = NULL;	385	childp->sibling = NULL;
370		386
371	unsigned long key = (unsigned long) parentp;	387	unsigned long key = (unsigned long) parentp;
372	hash_table_remove(&childp->names, &key, 1);	388	hash_table_remove(&childp->names, &key, 1);
373		389
374	childp->lnkcnt--;	390	childp->lnkcnt--;
375		391
376	return EOK;	392	return EOK;
377	}	393	}
378		394
379	int tmpfs_destroy_node(void *nodep)	395	int tmpfs_destroy_node(void *nodep)
380	{	396	{
381	tmpfs_dentry_t dentry = (tmpfs_dentry_t ) nodep;	397	tmpfs_dentry_t dentry = (tmpfs_dentry_t ) nodep;
382		398
383	assert(!dentry->lnkcnt);	399	assert(!dentry->lnkcnt);
384	assert(!dentry->child);	400	assert(!dentry->child);
385	assert(!dentry->sibling);	401	assert(!dentry->sibling);
386		402
387	unsigned long key = dentry->index;	403	unsigned long key[] = {
-		404	[DENTRIES_KEY_INDEX] = dentry->index,
-		405	[DENTRIES_KEY_DEV] = dentry->dev_handle
-		406	};
388	hash_table_remove(&dentries, &key, 1);	407	hash_table_remove(&dentries, key, 2);
389		408
390	hash_table_destroy(&dentry->names);	409	hash_table_destroy(&dentry->names);
391		410
392	if (dentry->type == TMPFS_FILE)	411	if (dentry->type == TMPFS_FILE)
393	free(dentry->data);	412	free(dentry->data);
394	free(dentry);	413	free(dentry);
395	return EOK;	414	return EOK;
396	}	415	}
397		416
398	void tmpfs_mounted(ipc_callid_t rid, ipc_call_t *request)	417	void tmpfs_mounted(ipc_callid_t rid, ipc_call_t *request)
399	{	418	{
400	dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);	419	dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
401		420
-		421	/* accept the mount options */
-		422	ipc_callid_t callid;
-		423	size_t size;
-		424	if (!ipc_data_write_receive(&callid, &size)) {
-		425	ipc_answer_0(callid, EINVAL);
-		426	ipc_answer_0(rid, EINVAL);
-		427	return;
-		428	}
-		429	char *opts = malloc(size + 1);
-		430	if (!opts) {
-		431	ipc_answer_0(callid, ENOMEM);
-		432	ipc_answer_0(rid, ENOMEM);
-		433	return;
-		434	}
-		435	ipcarg_t retval = ipc_data_write_finalize(callid, opts, size);
-		436	if (retval != EOK) {
-		437	ipc_answer_0(rid, retval);
-		438	free(opts);
-		439	return;
-		440	}
-		441	opts[size] = '\0';
-		442
402	/* Initialize TMPFS. */	443	/* Initialize TMPFS instance. */
403	if (!root && !tmpfs_init()) {	444	if (!tmpfs_instance_init(dev_handle)) {
404	ipc_answer_0(rid, ENOMEM);	445	ipc_answer_0(rid, ENOMEM);
405	return;	446	return;
406	}	447	}
407		448
-		449	tmpfs_dentry_t *root = tmpfs_root_get(dev_handle);
408	if (dev_handle >= 0) {	450	if (str_cmp(opts, "restore") == 0) {
409	if (tmpfs_restore(dev_handle))	451	if (tmpfs_restore(dev_handle))
410	ipc_answer_3(rid, EOK, root->index, root->size,	452	ipc_answer_3(rid, EOK, root->index, root->size,
411	root->lnkcnt);	453	root->lnkcnt);
412	else	454	else
413	ipc_answer_0(rid, ELIMIT);	455	ipc_answer_0(rid, ELIMIT);
414	} else {	456	} else {
415	ipc_answer_3(rid, EOK, root->index, root->size, root->lnkcnt);	457	ipc_answer_3(rid, EOK, root->index, root->size, root->lnkcnt);
416	}	458	}
417	}	459	}
418		460
419	void tmpfs_mount(ipc_callid_t rid, ipc_call_t *request)	461	void tmpfs_mount(ipc_callid_t rid, ipc_call_t *request)
420	{	462	{
421	dev_handle_t mp_dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);	463	dev_handle_t mp_dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
422	fs_index_t mp_index = (fs_index_t) IPC_GET_ARG2(*request);	464	fs_index_t mp_index = (fs_index_t) IPC_GET_ARG2(*request);
423	fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*request);	465	fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*request);
424	dev_handle_t mr_dev_handle = (dev_handle_t) IPC_GET_ARG4(*request);	466	dev_handle_t mr_dev_handle = (dev_handle_t) IPC_GET_ARG4(*request);
425		467
426	ipc_answer_0(rid, ENOTSUP);	468	ipc_answer_0(rid, ENOTSUP);
427	}	469	}
428		470
429	void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request)	471	void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request)
430	{	472	{
431	libfs_lookup(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);	473	libfs_lookup(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
432	}	474	}
433		475
434	void tmpfs_read(ipc_callid_t rid, ipc_call_t *request)	476	void tmpfs_read(ipc_callid_t rid, ipc_call_t *request)
435	{	477	{
436	dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);	478	dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
437	fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);	479	fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
438	off_t pos = (off_t)IPC_GET_ARG3(*request);	480	off_t pos = (off_t)IPC_GET_ARG3(*request);
439		481
440	/*	482	/*
441	* Lookup the respective dentry.	483	* Lookup the respective dentry.
442	*/	484	*/
443	link_t *hlp;	485	link_t *hlp;
444	unsigned long key = index;	486	unsigned long key[] = {
-		487	[DENTRIES_KEY_INDEX] = index,
-		488	[DENTRIES_KEY_DEV] = dev_handle,
-		489	};
445	hlp = hash_table_find(&dentries, &key);	490	hlp = hash_table_find(&dentries, key);
446	if (!hlp) {	491	if (!hlp) {
447	ipc_answer_0(rid, ENOENT);	492	ipc_answer_0(rid, ENOENT);

Subversion Repositories HelenOS

(root)/branches/dynload/uspace/srv/fs/tmpfs/tmpfs_ops.c – Rev 3674 → 4348