From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kRjZX-0004vW-6J for barebox@lists.infradead.org; Sun, 11 Oct 2020 22:12:08 +0000 From: Ahmad Fatoum Date: Mon, 12 Oct 2020 00:11:53 +0200 Message-Id: <20201011221200.9023-4-a.fatoum@pengutronix.de> In-Reply-To: <20201011221200.9023-1-a.fatoum@pengutronix.de> References: <20201011221200.9023-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 04/11] sandbox: hostfile: support anonymous hostfiles in device tree To: barebox@lists.infradead.org Cc: Ahmad Fatoum So far use of hostfile in the device tree required us to hard code a file name. If we instead create a temporary file on demand, we can support: - environment - barebox-state - syscon for reset source and reboot mode out of the box with no dependency on external files. Do the necessary, so a hostfile device tree node without a barebox,filename gets a temporary file generated with the appropriate size. Signed-off-by: Ahmad Fatoum --- arch/sandbox/Makefile | 1 + arch/sandbox/board/hostfile.c | 27 +++++++++++++--- arch/sandbox/os/common.c | 58 +++++++++++++++++++++++++++++++---- 3 files changed, 76 insertions(+), 10 deletions(-) diff --git a/arch/sandbox/Makefile b/arch/sandbox/Makefile index 09112c3ba8d3..17f9a298d773 100644 --- a/arch/sandbox/Makefile +++ b/arch/sandbox/Makefile @@ -24,6 +24,7 @@ KBUILD_CFLAGS += -Dmalloc=barebox_malloc -Dcalloc=barebox_calloc \ -Dgetenv=barebox_getenv -Dprintf=barebox_printf \ -Dglob=barebox_glob -Dglobfree=barebox_globfree \ -Dioctl=barebox_ioctl -Dfstat=barebox_fstat \ + -Dftruncate=barebox_ftruncate -Dasprintf=barebox_asprintf \ -Dopendir=barebox_opendir -Dreaddir=barebox_readdir \ -Dclosedir=barebox_closedir -Dreadlink=barebox_readlink \ -Doptarg=barebox_optarg -Doptind=barebox_optind diff --git a/arch/sandbox/board/hostfile.c b/arch/sandbox/board/hostfile.c index 8990e20f15b6..e3e38b7119d5 100644 --- a/arch/sandbox/board/hostfile.c +++ b/arch/sandbox/board/hostfile.c @@ -191,14 +191,22 @@ static int of_hostfile_fixup(struct device_node *root, void *ctx) { struct hf_info *hf = ctx; struct device_node *node; + bool name_only = false; int ret; - node = of_new_node(root, hf->devname); + node = of_get_child_by_name(root, hf->devname); + if (node) + name_only = true; + else + node = of_new_node(root, hf->devname); ret = of_property_write_string(node, "barebox,filename", hf->filename); if (ret) return ret; + if (name_only) + return 0; + ret = of_property_write_string(node, "compatible", hostfile_dt_ids->compatible); if (ret) return ret; @@ -226,18 +234,23 @@ static int of_hostfile_map_fixup(struct device_node *root, void *ctx) for_each_compatible_node_from(node, root, NULL, hostfile_dt_ids->compatible) { struct hf_info hf = {}; - uint64_t reg[2]; + uint64_t reg[2] = {}; + bool no_filename; hf.devname = node->name; ret = of_property_read_string(node, "barebox,filename", &hf.filename); - if (ret) - goto out; + no_filename = ret; hf.is_blockdev = of_property_read_bool(node, "barebox,blockdev"); hf.is_cdev = of_property_read_bool(node, "barebox,cdev"); hf.is_readonly = of_property_read_bool(node, "barebox,read-only"); + of_property_read_u64_array(node, "reg", reg, ARRAY_SIZE(reg)); + + hf.base = reg[0]; + hf.size = reg[1]; + ret = linux_open_hostfile(&hf); if (ret) goto out; @@ -253,6 +266,12 @@ static int of_hostfile_map_fixup(struct device_node *root, void *ctx) if (ret) goto out; + if (no_filename) { + ret = of_property_write_string(node, "barebox,filename", hf.filename); + if (ret) + goto out; + } + ret = of_property_write_u32(node, "barebox,fd", hf.fd); out: if (ret) diff --git a/arch/sandbox/os/common.c b/arch/sandbox/os/common.c index 6032a8c26b41..54d2b97b4af7 100644 --- a/arch/sandbox/os/common.c +++ b/arch/sandbox/os/common.c @@ -19,6 +19,7 @@ * These are host includes. Never include any barebox header * files here... */ +#define _GNU_SOURCE #include #include #include @@ -124,6 +125,7 @@ void __attribute__((noreturn)) linux_exit(void) exit(0); } +static size_t saved_argv_len; static char **saved_argv; void linux_reexec(void) @@ -292,14 +294,52 @@ static int add_image(const char *_str, char *devname_template, int *devname_numb int linux_open_hostfile(struct hf_info *hf) { + char *buf = NULL; struct stat s; int fd; - printf("add %s backed by file %s%s\n", hf->devname, - hf->filename, hf->is_readonly ? "(ro)" : ""); + printf("add %s %sbacked by file %s%s\n", hf->devname, + hf->filename ? "" : "initially un", hf->filename ?: "", + hf->is_readonly ? "(ro)" : ""); - fd = hf->fd = open(hf->filename, (hf->is_readonly ? O_RDONLY : O_RDWR) | O_CLOEXEC); - hf->base = (unsigned long)MAP_FAILED; + if (hf->filename) { + fd = hf->fd = open(hf->filename, (hf->is_readonly ? O_RDONLY : O_RDWR) | O_CLOEXEC); + } else { + char *filename; + int ret; + + ret = asprintf(&buf, "--image=%s=/tmp/barebox-hostfileXXXXXX", hf->devname); + if (ret < 0) { + perror("asprintf"); + goto err_out; + } + + filename = buf + strlen("--image==") + strlen(hf->devname); + + fd = hf->fd = mkstemp(filename); + if (fd >= 0) { + ret = fcntl(fd, F_SETFD, FD_CLOEXEC); + if (ret < 0) { + perror("fcntl"); + goto err_out; + } + + ret = ftruncate(fd, hf->size); + if (ret < 0) { + perror("ftruncate"); + goto err_out; + } + + hf->filename = filename; + + saved_argv = realloc(saved_argv, + ++saved_argv_len * sizeof(*saved_argv)); + if (!saved_argv) + exit(1); + saved_argv[saved_argv_len - 2] = buf; + saved_argv[saved_argv_len - 1] = NULL; + } + } if (fd < 0) { perror("open"); @@ -311,6 +351,7 @@ int linux_open_hostfile(struct hf_info *hf) goto err_out; } + hf->base = (unsigned long)MAP_FAILED; hf->size = s.st_size; if (S_ISBLK(s.st_mode)) { @@ -344,6 +385,7 @@ int linux_open_hostfile(struct hf_info *hf) err_out: if (fd > 0) close(fd); + free(buf); return -1; } @@ -413,8 +455,6 @@ int main(int argc, char *argv[]) __sanitizer_set_death_callback(cookmode); #endif - saved_argv = argv; - while (1) { option_index = 0; opt = getopt_long(argc, argv, optstring, @@ -452,6 +492,12 @@ int main(int argc, char *argv[]) } } + saved_argv_len = argc + 1; + saved_argv = calloc(saved_argv_len, sizeof(*saved_argv)); + if (!saved_argv) + exit(1); + memcpy(saved_argv, argv, saved_argv_len * sizeof(*saved_argv)); + ram = malloc(malloc_size); if (!ram) { printf("unable to get malloc space\n"); -- 2.28.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox