libuvfs/common/fs.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
 */

#include <libuvfs_impl.h>

#include <umem.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/types32.h>
#include <sys/mkdev.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <strings.h>
#include <pthread.h>
#include <atomic.h>

static umem_cache_t *libuvfs_fs_cache;

uint32_t libuvfs_umem_alloc_failures = 0;
uint32_t libuvfs_umem_alloc_max_failures = LIBUVFS_UMEM_ALLOC_MAX_FAILURES;
uint32_t libuvfs_umem_alloc_failure_sleep = LIBUVFS_UMEM_ALLOC_FAILURE_SLEEP;

static libuvfs_callback_reg_t libuvfs_default_callbacks[] = {
    {UVFS_CB_VOP_FSYNC, libuvfs_default_success},
    {NULL, NULL},
};

static void
libuvfs_init_callbacks(libuvfs_fs_t *fs)
{
    const libuvfs_callback_reg_t *reg;
    int i;

    for (i = 0; i < UVFS_CB_NUM_OPS; i++)
        fs->fs_callback[i].lcr_callback = NULL;

    for (reg = libuvfs_default_callbacks; reg->lcr_callback; reg++)
        fs->fs_callback[reg->lcr_optag] = *reg;
}

static void
libuvfs_fs_rand(libuvfs_fs_t *fs)
{
    int f;

    fs->fs_fid_random = rand();
    f = open("/dev/random", O_RDONLY);
    if (f >= 0) {
        uint64_t better;

        (void) read(f, &better, sizeof (better));
        (void) close(f);

        fs->fs_fid_random ^= better;
    }
}

libuvfs_fs_t *
libuvfs_create_fs(libuvfs_version_t version, uint64_t fsid)
{
    libuvfs_fs_t *fs;

    if (version != LIBUVFS_VERSION)
        return (NULL);

    fs = umem_cache_alloc(libuvfs_fs_cache, UMEM_NOFAIL);

    fs->fs_dev = -1;
    fs->fs_fsid = fsid;

    fs->fs_io_maxread = 0;
    fs->fs_io_maxwrite = 0;
    fs->fs_max_dthreads = 0;
    fs->fs_cur_dthreads = 0;

    libuvfs_init_callbacks(fs);

    fs->fs_door = -1;

    fs->fs_scf_handle = NULL;
    fs->fs_scf_error = 0;
    fs->fs_scf_props = NULL;
    fs->fs_daemon_fmri_size = 0;
    fs->fs_daemon_fmri = NULL;

    if (fs->fs_fsid == LIBUVFS_FSID_SVC)
        libuvfs_get_daemon_fsid(fs);

    libuvfs_fs_rand(fs);
    fs->fs_fid_seq = 1;

    return (fs);
}

void
libuvfs_destroy_fs(libuvfs_fs_t *fs)
{
    if (fs->fs_dev >= 0)
        (void) close(fs->fs_dev);
    if (fs->fs_door >= 0)
        (void) close(fs->fs_door);

    if (fs->fs_scf_props != NULL)
        scf_simple_app_props_free(fs->fs_scf_props);
    if (fs->fs_scf_handle != NULL)
        scf_handle_destroy(fs->fs_scf_handle);
    if (fs->fs_daemon_fmri != NULL)
        umem_free(fs->fs_daemon_fmri, fs->fs_daemon_fmri_size);

    umem_cache_free(libuvfs_fs_cache, fs);
}

/*ARGSUSED*/
static int
libuvfs_fs_construct(void *vfs, void *foo, int bar)
{
    libuvfs_fs_t *fs = vfs;

    (void) mutex_init(&fs->fs_lock, USYNC_THREAD, NULL);
    (void) mutex_init(&fs->fs_stash_lock, USYNC_THREAD, NULL);
    (void) mutex_init(&fs->fs_name_lock, USYNC_THREAD, NULL);
    (void) cond_init(&fs->fs_daemon_cv, USYNC_THREAD, NULL);
    (void) pthread_attr_init(&fs->fs_pthread_attr);
    libuvfs_stash_fs_construct(fs);
    libuvfs_name_fs_construct(fs);

    return (0);
}

/*ARGSUSED*/
static void
libuvfs_fs_destroy(void *vfs, void *foo)
{
    libuvfs_fs_t *fs = vfs;

    libuvfs_name_fs_destroy(fs);
    libuvfs_stash_fs_destroy(fs);
    (void) pthread_attr_destroy(&fs->fs_pthread_attr);
    (void) cond_destroy(&fs->fs_daemon_cv);
    (void) mutex_destroy(&fs->fs_stash_lock);
    (void) mutex_destroy(&fs->fs_lock);
}

static int
libuvfs_umem_alloc_fail(void)
{
    if (atomic_inc_32_nv(&libuvfs_umem_alloc_failures) >
        libuvfs_umem_alloc_max_failures)
        return (UMEM_CALLBACK_EXIT(255));

    (void) sleep(libuvfs_umem_alloc_failure_sleep);

    return (UMEM_CALLBACK_RETRY);
}

char *
libuvfs_strdup(const char *str)
{
    char *rc;

    rc = umem_alloc(strlen(str) + 1, UMEM_NOFAIL);

    return (strcpy(rc, str));
}

void
libuvfs_strfree(char *str)
{
    umem_free(str, strlen(str) + 1);
}

char *
libuvfs_hexdump(const void *stuff, int howlong)
{
    static char *hex = "0123456789abcdef";
    char *rc = umem_alloc(howlong * 2 + 1, UMEM_NOFAIL);
    uint8_t *bytes = (uint8_t *)stuff;
    int i;

    rc[howlong * 2] = '\0';

    for (i = 0; i < howlong; i++) {
        rc[2*i] = hex[bytes[i] >> 4];
        rc[2*i+1] = hex[bytes[i] & 0x0f];
    }

    return (rc);
}

#ifndef NBITSMINOR64
#define NBITSMINOR64    32
#endif
#ifndef MAXMAJ64
#define MAXMAJ64    0xffffffffUL
#endif
#ifndef MAXMIN64
#define MAXMIN64    0xffffffffUL
#endif

uint64_t
libuvfs_expldev(dev_t dev)
{
#ifndef _LP64
    major_t major =  (major_t)dev >> NBITSMINOR32 & MAXMAJ32;
    return (((uint64_t)major << NBITSMINOR64) |
        ((minor_t)dev & MAXMIN32));
#else
    return (dev);
#endif
}

dev_t
libuvfs_cmpldev(uint64_t dev)
{
#ifndef _LP64
    minor_t minor = (minor_t)dev & MAXMIN64;
    major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64;

    if (major > MAXMAJ32 || minor > MAXMIN32)
        return ((dev_t)-1);

    return (((dev32_t)major << NBITSMINOR32) | minor);
#else
    return (dev);
#endif
}

#pragma init(libuvfs_fs_init)
static void
libuvfs_fs_init(void)
{
    umem_nofail_callback(libuvfs_umem_alloc_fail);
    libuvfs_fs_cache = umem_cache_create("libuvfs_fs_cache",
        sizeof (libuvfs_fs_t), 0, libuvfs_fs_construct, libuvfs_fs_destroy,
        NULL, NULL, NULL, 0);

    srand(getpid() + time(0));
}

#pragma fini(libuvfs_fs_fini)
static void
libuvfs_fs_fini(void)
{
    umem_cache_destroy(libuvfs_fs_cache);
}