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authorSascha Hauer <s.hauer@pengutronix.de>2014-02-13 10:38:23 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2014-03-07 07:41:40 +0100
commit86f681abec4f8485d2e95537e0d59a8d9ab6b546 (patch)
treeb3070c7236ac3c35770c00c0c983bb0adcc6a0b7 /common/blspec.c
parenta162dfe50345d3461010759f8a0e79f7e388c140 (diff)
downloadbarebox-86f681abec4f8485d2e95537e0d59a8d9ab6b546.tar.gz
blspec: Add NFS support
With this barebox can start root filesystems containing bootloader spec entries via NFS. It is used as: boot nfs://<ipaddr>[:<port]//path/to/nfsroot Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/blspec.c')
-rw-r--r--common/blspec.c114
1 files changed, 112 insertions, 2 deletions
diff --git a/common/blspec.c b/common/blspec.c
index df3c9c3..9b4b096 100644
--- a/common/blspec.c
+++ b/common/blspec.c
@@ -10,6 +10,8 @@
* GNU General Public License for more details.
*
*/
+#define pr_fmt(fmt) "blspec: " fmt
+
#include <environment.h>
#include <globalvar.h>
#include <readkey.h>
@@ -22,6 +24,7 @@
#include <libbb.h>
#include <init.h>
#include <boot.h>
+#include <net.h>
#include <fs.h>
#include <of.h>
#include <linux/stat.h>
@@ -131,6 +134,107 @@ static int blspec_have_entry(struct blspec *blspec, const char *path)
}
/*
+ * nfs_find_mountpath - Check if a given url is already mounted
+ */
+static const char *nfs_find_mountpath(const char *nfshostpath)
+{
+ struct fs_device_d *fsdev;
+
+ for_each_fs_device(fsdev) {
+ if (fsdev->backingstore && !strcmp(fsdev->backingstore, nfshostpath))
+ return fsdev->path;
+ }
+
+ return NULL;
+}
+
+/*
+ * parse_nfs_url - check for nfs:// style url
+ *
+ * Check if the passed string is a NFS url and if yes, mount the
+ * NFS and return the path we have mounted to.
+ */
+static char *parse_nfs_url(const char *url)
+{
+ char *sep, *str, *host, *port, *path;
+ char *mountpath = NULL, *hostpath = NULL, *options = NULL;
+ const char *prevpath;
+ IPaddr_t ip;
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_FS_NFS))
+ return ERR_PTR(-ENOSYS);
+
+ if (strncmp(url, "nfs://", 6))
+ return ERR_PTR(-EINVAL);
+
+ url += 6;
+
+ str = xstrdup(url);
+
+ host = str;
+
+ sep = strchr(str, '/');
+ if (!sep) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ *sep++ = 0;
+
+ path = sep;
+
+ port = strchr(host, ':');
+ if (port)
+ *port++ = 0;
+
+ ret = ifup_all(0);
+ if (ret) {
+ pr_err("Failed to bring up networking\n");
+ goto out;
+ }
+
+ ip = resolv(host);
+ if (ip == 0)
+ goto out;
+
+ hostpath = asprintf("%s:%s", ip_to_string(ip), path);
+
+ prevpath = nfs_find_mountpath(hostpath);
+
+ if (prevpath) {
+ mountpath = xstrdup(prevpath);
+ } else {
+ mountpath = asprintf("/mnt/nfs-%s-blspec-%08x", host, rand());
+ if (port)
+ options = asprintf("mountport=%s,port=%s", port, port);
+
+ ret = make_directory(mountpath);
+ if (ret)
+ goto out;
+
+ pr_debug("host: %s port: %s path: %s\n", host, port, path);
+ pr_debug("hostpath: %s mountpath: %s options: %s\n", hostpath, mountpath, options);
+
+ ret = mount(hostpath, "nfs", mountpath, options);
+ if (ret)
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ free(str);
+ free(hostpath);
+ free(options);
+
+ if (ret)
+ free(mountpath);
+
+ return ret ? ERR_PTR(ret) : mountpath;
+}
+
+/*
* blspec_scan_directory - scan over a directory
*
* Given a root path collects all blspec entries found under /blspec/entries/.
@@ -145,9 +249,13 @@ int blspec_scan_directory(struct blspec *blspec, const char *root)
char *abspath;
int ret, found = 0;
const char *dirname = "loader/entries";
- char *entry_default = NULL, *entry_once = NULL, *name;
+ char *entry_default = NULL, *entry_once = NULL, *name, *nfspath = NULL;
+
+ nfspath = parse_nfs_url(root);
+ if (!IS_ERR(nfspath))
+ root = nfspath;
- pr_debug("%s: %s %s\n", __func__, root, dirname);
+ pr_info("%s: %s %s\n", __func__, root, dirname);
entry_default = read_file_line("%s/default", root);
entry_once = read_file_line("%s/once", root);
@@ -239,6 +347,8 @@ int blspec_scan_directory(struct blspec *blspec, const char *root)
closedir(dir);
err_out:
+ if (!IS_ERR(nfspath))
+ free(nfspath);
free(abspath);
free(entry_default);
free(entry_once);