fuse.c

LINUX下读写NTFS分区的工具。 已经集成了通过LIBCONV库支持中文的代码。

    struct fuse *f = req_fuse_prepare(req);
    struct fuse_entry_param e;
    char *path;
    int err;

    err = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path_name(f, parent, name);
    if (path != NULL) {
        struct fuse_intr_data d;
        if (f->conf.debug)
            fprintf(stderr, "SYMLINK %s\n", path);
        fuse_prepare_interrupt(f, req, &d);
        err = fuse_fs_symlink(f->fs, linkname, path);
        if (!err)
            err = lookup_path(f, parent, name, path, &e, NULL);
        fuse_finish_interrupt(f, req, &d);
        free(path);
    }
    pthread_rwlock_unlock(&f->tree_lock);
    reply_entry(req, &e, err);
}

static void fuse_lib_rename(fuse_req_t req, fuse_ino_t olddir,
                            const char *oldname, fuse_ino_t newdir,
                            const char *newname)
{
    struct fuse *f = req_fuse_prepare(req);
    char *oldpath;
    char *newpath;
    int err;

    err = -ENOENT;
    pthread_rwlock_wrlock(&f->tree_lock);
    oldpath = get_path_name(f, olddir, oldname);
    if (oldpath != NULL) {
        newpath = get_path_name(f, newdir, newname);
        if (newpath != NULL) {
            struct fuse_intr_data d;
            if (f->conf.debug)
                fprintf(stderr, "RENAME %s -> %s\n", oldpath, newpath);
            err = 0;
            fuse_prepare_interrupt(f, req, &d);
            if (!f->conf.hard_remove && is_open(f, newdir, newname))
                err = hide_node(f, newpath, newdir, newname);
            if (!err) {
                err = fuse_fs_rename(f->fs, oldpath, newpath);
                if (!err)
                    err = rename_node(f, olddir, oldname, newdir, newname, 0);
            }
            fuse_finish_interrupt(f, req, &d);
            free(newpath);
        }
        free(oldpath);
    }
    pthread_rwlock_unlock(&f->tree_lock);
    reply_err(req, err);
}

static void fuse_lib_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent,
                          const char *newname)
{
    struct fuse *f = req_fuse_prepare(req);
    struct fuse_entry_param e;
    char *oldpath;
    char *newpath;
    int err;

    err = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    oldpath = get_path(f, ino);
    if (oldpath != NULL) {
        newpath =  get_path_name(f, newparent, newname);
        if (newpath != NULL) {
            struct fuse_intr_data d;
            if (f->conf.debug)
                fprintf(stderr, "LINK %s\n", newpath);
            fuse_prepare_interrupt(f, req, &d);
            err = fuse_fs_link(f->fs, oldpath, newpath);
            if (!err)
                err = lookup_path(f, newparent, newname, newpath, &e, NULL);
            fuse_finish_interrupt(f, req, &d);
            free(newpath);
        }
        free(oldpath);
    }
    pthread_rwlock_unlock(&f->tree_lock);
    reply_entry(req, &e, err);
}

static void fuse_do_release(struct fuse *f, fuse_ino_t ino, const char *path,
                            struct fuse_file_info *fi)
{
    struct node *node;
    int unlink_hidden = 0;

    fuse_fs_release(f->fs, path ? path : "-", fi);

    pthread_mutex_lock(&f->lock);
    node = get_node(f, ino);
    assert(node->open_count > 0);
    --node->open_count;
    if (node->is_hidden && !node->open_count) {
        unlink_hidden = 1;
        node->is_hidden = 0;
    }
    pthread_mutex_unlock(&f->lock);

    if(unlink_hidden && path)
        fuse_fs_unlink(f->fs, path);
}

static void fuse_lib_create(fuse_req_t req, fuse_ino_t parent,
                            const char *name, mode_t mode,
                            struct fuse_file_info *fi)
{
    struct fuse *f = req_fuse_prepare(req);
    struct fuse_intr_data d;
    struct fuse_entry_param e;
    char *path;
    int err;

    err = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path_name(f, parent, name);
    if (path) {
        fuse_prepare_interrupt(f, req, &d);
        err = fuse_fs_create(f->fs, path, mode, fi);
        if (!err) {
            err = lookup_path(f, parent, name, path, &e, fi);
            if (err)
                fuse_fs_release(f->fs, path, fi);
            else if (!S_ISREG(e.attr.st_mode)) {
                err = -EIO;
                fuse_fs_release(f->fs, path, fi);
                forget_node(f, e.ino, 1);
            } else {
                if (f->conf.direct_io)
                    fi->direct_io = 1;
                if (f->conf.kernel_cache)
                    fi->keep_cache = 1;

            }
        }
        fuse_finish_interrupt(f, req, &d);
    }
    if (!err) {
        pthread_mutex_lock(&f->lock);
        get_node(f, e.ino)->open_count++;
        pthread_mutex_unlock(&f->lock);
        if (fuse_reply_create(req, &e, fi) == -ENOENT) {
            /* The open syscall was interrupted, so it must be cancelled */
            fuse_prepare_interrupt(f, req, &d);
            fuse_do_release(f, e.ino, path, fi);
            fuse_finish_interrupt(f, req, &d);
            forget_node(f, e.ino, 1);
        } else if (f->conf.debug) {
            fprintf(stderr, "  CREATE[%llu] flags: 0x%x %s\n",
                    (unsigned long long) fi->fh, fi->flags, path);
        }
    } else
        reply_err(req, err);

    if (path)
        free(path);

    pthread_rwlock_unlock(&f->tree_lock);
}

static double diff_timespec(const struct timespec *t1,
                            const struct timespec *t2)
{
    return (t1->tv_sec - t2->tv_sec) + 
        ((double) t1->tv_nsec - (double) t2->tv_nsec) / 1000000000.0;
}

static void open_auto_cache(struct fuse *f, fuse_ino_t ino, const char *path,
                            struct fuse_file_info *fi)
{
    struct node *node;

    pthread_mutex_lock(&f->lock);
    node = get_node(f, ino);
    if (node->cache_valid) {
        struct timespec now;

        curr_time(&now);
        if (diff_timespec(&now, &node->stat_updated) > f->conf.ac_attr_timeout) {
            struct stat stbuf;
            int err;
            pthread_mutex_unlock(&f->lock);
            err = fuse_fs_fgetattr(f->fs, path, &stbuf, fi);
            pthread_mutex_lock(&f->lock);
            if (!err)
                update_stat(node, &stbuf);
            else
                node->cache_valid = 0;
        }
    }
    if (node->cache_valid)
        fi->keep_cache = 1;

    node->cache_valid = 1;
    pthread_mutex_unlock(&f->lock);
}

static void fuse_lib_open(fuse_req_t req, fuse_ino_t ino,
                          struct fuse_file_info *fi)
{
    struct fuse *f = req_fuse_prepare(req);
    struct fuse_intr_data d;
    char *path = NULL;
    int err = 0;

    err = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path(f, ino);
    if (path) {
        fuse_prepare_interrupt(f, req, &d);
        err = fuse_fs_open(f->fs, path, fi);
        if (!err) {
            if (f->conf.direct_io)
                fi->direct_io = 1;
            if (f->conf.kernel_cache)
                fi->keep_cache = 1;

            if (f->conf.auto_cache)
                open_auto_cache(f, ino, path, fi);
        }
        fuse_finish_interrupt(f, req, &d);
    }
    if (!err) {
        pthread_mutex_lock(&f->lock);
        get_node(f, ino)->open_count++;
        pthread_mutex_unlock(&f->lock);
        if (fuse_reply_open(req, fi) == -ENOENT) {
            /* The open syscall was interrupted, so it must be cancelled */
            fuse_prepare_interrupt(f, req, &d);
            fuse_do_release(f, ino, path, fi);
            fuse_finish_interrupt(f, req, &d);
        } else if (f->conf.debug) {
            fprintf(stderr, "OPEN[%llu] flags: 0x%x %s\n",
                    (unsigned long long) fi->fh, fi->flags, path);
        }
    } else
        reply_err(req, err);

    if (path)
        free(path);
    pthread_rwlock_unlock(&f->tree_lock);
}

static void fuse_lib_read(fuse_req_t req, fuse_ino_t ino, size_t size,
                          off_t off, struct fuse_file_info *fi)
{
    struct fuse *f = req_fuse_prepare(req);
    char *path;
    char *buf;
    int res;

    buf = (char *) malloc(size);
    if (buf == NULL) {
        reply_err(req, -ENOMEM);
        return;
    }

    res = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path(f, ino);
    if (path != NULL) {
        struct fuse_intr_data d;
        if (f->conf.debug)
            fprintf(stderr, "READ[%llu] %lu bytes from %llu\n",
                    (unsigned long long) fi->fh, (unsigned long) size,
                    (unsigned long long) off);

        fuse_prepare_interrupt(f, req, &d);
        res = fuse_fs_read(f->fs, path, buf, size, off, fi);
        fuse_finish_interrupt(f, req, &d);
        free(path);
    }
    pthread_rwlock_unlock(&f->tree_lock);

    if (res >= 0) {
        if (f->conf.debug)
            fprintf(stderr, "   READ[%llu] %u bytes\n",
                    (unsigned long long)fi->fh, res);
        if ((size_t) res > size)
            fprintf(stderr, "fuse: read too many bytes");
        fuse_reply_buf(req, buf, res);
    } else
        reply_err(req, res);

    free(buf);
}

static void fuse_lib_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
                       size_t size, off_t off, struct fuse_file_info *fi)
{
    struct fuse *f = req_fuse_prepare(req);
    char *path;
    int res;

    res = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path(f, ino);
    if (path != NULL) {
        struct fuse_intr_data d;
        if (f->conf.debug)
            fprintf(stderr, "WRITE%s[%llu] %lu bytes to %llu\n",
                    fi->writepage ? "PAGE" : "", (unsigned long long) fi->fh,
                    (unsigned long) size, (unsigned long long) off);

        fuse_prepare_interrupt(f, req, &d);
        res = fuse_fs_write(f->fs, path, buf, size, off, fi);
        fuse_finish_interrupt(f, req, &d);
        free(path);
    }
    pthread_rwlock_unlock(&f->tree_lock);

    if (res >= 0) {
        if (f->conf.debug)
            fprintf(stderr, "   WRITE%s[%llu] %u bytes\n",
                    fi->writepage ? "PAGE" : "", (unsigned long long) fi->fh,
                    res);
        if ((size_t) res > size)
            fprintf(stderr, "fuse: wrote too many bytes");
        fuse_reply_write(req, res);
    } else
        reply_err(req, res);
}

static void fuse_lib_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
                       struct fuse_file_info *fi)
{
    struct fuse *f = req_fuse_prepare(req);
    char *path;
    int err;

    err = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path(f, ino);
    if (path != NULL) {
        struct fuse_intr_data d;
        if (f->conf.debug)
            fprintf(stderr, "FSYNC[%llu]\n", (unsigned long long) fi->fh);
        fuse_prepare_interrupt(f, req, &d);
        err = fuse_fs_fsync(f->fs, path, datasync, fi);
        fuse_finish_interrupt(f, req, &d);
        free(path);
    }
    pthread_rwlock_unlock(&f->tree_lock);
    reply_err(req, err);
}

static struct fuse_dh *get_dirhandle(const struct fuse_file_info *llfi,
                                     struct fuse_file_info *fi)
{
    struct fuse_dh *dh = (struct fuse_dh *) (uintptr_t) llfi->fh;
    memset(fi, 0, sizeof(struct fuse_file_info));
    fi->fh = dh->fh;
    fi->fh_old = dh->fh;
    return dh;
}

static void fuse_lib_opendir(fuse_req_t req, fuse_ino_t ino,
                       struct fuse_file_info *llfi)
{
    struct fuse *f = req_fuse_prepare(req);
    struct fuse_intr_data d;
    struct fuse_dh *dh;
    struct fuse_file_info fi;
    char *path;
    int err;

    dh = (struct fuse_dh *) malloc(sizeof(struct fuse_dh));
    if (dh == NULL) {
        reply_err(req, -ENOMEM);
        return;
    }
    memset(dh, 0, sizeof(struct fuse_dh));
    dh->fuse = f;
    dh->contents = NULL;
    dh->len = 0;
    dh->filled = 0;
    dh->nodeid = ino;
    fuse_mutex_init(&dh->lock);

    llfi->fh = (uintptr_t) dh;

    memset(&fi, 0, sizeof(fi));
    fi.flags = llfi->flags;

    err = -ENOENT;
    pthread_rwlock_rdlock(&f->tree_lock);
    path = get_path(f, ino);
    if (path != NULL) {
        fuse_prepare_interrupt(f, req, &d);
        err = fuse_fs_opendir(f->fs, path, &fi);
        fuse_finish_interrupt(f, req, &d);
        dh->fh = fi.fh;
    }
    if (!err) {
        if (fuse_reply_open(req, llfi) == -ENOENT) {
            /* The opendir syscall was interrupted, so it must be cancelled */
            fuse_prepare_interrupt(f, req, &d);
            fuse_fs_releasedir(f->fs, path, &fi);
            fuse_finish_interrupt(f, req, &d);
            pthread_mutex_destroy(&dh->lock);
            free(dh);
        }
    } else {
        reply_err(req, err);
        pthread_mutex_destroy(&dh->lock);
        free(dh);
    }
    free(path);
    pthread_rwlock_unlock(&f->tree_lock);
}

static int extend_contents(struct fuse_dh *dh, unsigned minsize)
{
    if (minsize > dh->size) {
        char *newptr;
        unsigned newsize = dh->size;
        if (!newsize)
            newsize = 1024;
        while (newsize < minsize) {
	    if (newsize >= 0x80000000)
	       	newsize = 0xffffffff;
	    else
	       	newsize *= 2;
        }

        newptr = (char *) realloc(dh->contents, newsize);
        if (!newptr) {
            dh->error = -ENOMEM;
            return -1;
        }
        dh->contents = newptr;
        dh->size = newsize;
    }
    return 0;
}

static int fill_dir(void *dh_, const char *name, const struct stat *statp,
                    off_t off)
{
    struct fuse_dh *dh = (struct fuse_dh *) dh_;
    struct stat stbuf;
    size_t newlen;

    if (statp)
        stbuf = *statp;
    else {
        memset(&stbuf, 0, sizeof(stbuf));
        stbuf.st_ino = FUSE_UNKNOWN_INO;
    }

    if (!dh->fuse->conf.use_ino) {
        stbuf.st_ino = FUSE_UNKNOWN_INO;
        if (dh->fuse->conf.readdir_ino) {
            struct node *node;
            pthread_mutex_lock(&dh->fuse->lock);
            node = lookup_node(dh->fuse, dh->nodeid, name);
            if (node)
                stbuf.st_ino  = (ino_t) node->nodeid;
            pthread_mutex_unlock(&dh->fuse->lock);
        }
    }

    if (off) {
        if (extend_contents(dh, dh->needlen) == -1)
            return 1;

        dh->filled = 0;
        newlen = dh->len + fuse_add_direntry(dh->req, dh->contents + dh->len,