summaryrefslogtreecommitdiffstats
path: root/contrib/fuse-lib/mount-common.c
diff options
context:
space:
mode:
authorCsaba Henk <csaba@redhat.com>2012-05-15 13:41:57 +0530
committerAnand Avati <avati@redhat.com>2012-05-21 13:47:41 -0700
commit6012dfe6b9c4d69914078cc0b716bf11aac5e957 (patch)
treeb98aad92cc2fdaca12d72c5d05f1250ce6a6743a /contrib/fuse-lib/mount-common.c
parent439d0426dd60ef6c1f4af13fcbbe73f1d206acc6 (diff)
fuse: reorganize mounting code
Macro-driven conditional compilation was a chaos. New scheme is: contrib/fuse-lib/mount-common.c: libfuse routines used both by glusterfs and fusermount contrib/fuse-lib/mount.c: libfuse-derived but customized mounting code for glusterfs contrib/fuse-util/mount_util.c: libfuse routines used only by fusermount Change-Id: I3e0ba7f74e36556b78244cd7676eb4d379939602 BUG: 762389 Signed-off-by: Csaba Henk <csaba@redhat.com> Reviewed-on: http://review.gluster.com/3342 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
Diffstat (limited to 'contrib/fuse-lib/mount-common.c')
-rw-r--r--contrib/fuse-lib/mount-common.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/contrib/fuse-lib/mount-common.c b/contrib/fuse-lib/mount-common.c
new file mode 100644
index 00000000000..7411e56c89b
--- /dev/null
+++ b/contrib/fuse-lib/mount-common.c
@@ -0,0 +1,247 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
+ Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
+
+ This program can be distributed under the terms of the GNU LGPLv2.
+ See the file COPYING.LIB.
+*/
+
+#include "mount-gluster-compat.h"
+
+/*
+ * These functions (and gf_fuse_umount() in mount.c)
+ * were originally taken from libfuse as of commit 7960e99e
+ * (http://fuse.git.sourceforge.net/git/gitweb.cgi?p=fuse/fuse;a=commit;h=7960e99e)
+ * almost verbatim. What has been changed upon adoption:
+ * - style adopted to that of glusterfs
+ * - s/fprintf/gf_log/
+ * - s/free/FREE/, s/malloc/MALLOC/
+ * - there are some other minor things
+ *
+ * For changes that were made later and syncs with upstream,
+ * see the commit log.
+ */
+
+#ifndef __NetBSD__
+static int
+mtab_needs_update (const char *mnt)
+{
+ int res;
+ struct stat stbuf;
+
+ /* If mtab is within new mount, don't touch it */
+ if (strncmp (mnt, _PATH_MOUNTED, strlen (mnt)) == 0 &&
+ _PATH_MOUNTED[strlen (mnt)] == '/')
+ return 0;
+
+ /*
+ * Skip mtab update if /etc/mtab:
+ *
+ * - doesn't exist,
+ * - is a symlink,
+ * - is on a read-only filesystem.
+ */
+ res = lstat (_PATH_MOUNTED, &stbuf);
+ if (res == -1) {
+ if (errno == ENOENT)
+ return 0;
+ } else {
+ if (S_ISLNK (stbuf.st_mode))
+ return 0;
+
+ res = access (_PATH_MOUNTED, W_OK);
+ if (res == -1 && errno == EROFS)
+ return 0;
+ }
+
+ return 1;
+}
+#else /* __NetBSD__ */
+#define mtab_needs_update(x) 1
+#endif /* __NetBSD__ */
+
+int
+fuse_mnt_add_mount (const char *progname, const char *fsname,
+ const char *mnt, const char *type, const char *opts)
+{
+ int res;
+ int status;
+ sigset_t blockmask;
+ sigset_t oldmask;
+
+ if (!mtab_needs_update (mnt))
+ return 0;
+
+ sigemptyset (&blockmask);
+ sigaddset (&blockmask, SIGCHLD);
+ res = sigprocmask (SIG_BLOCK, &blockmask, &oldmask);
+ if (res == -1) {
+ GFFUSE_LOGERR ("%s: sigprocmask: %s",
+ progname, strerror (errno));
+ return -1;
+ }
+
+ res = fork ();
+ if (res == -1) {
+ GFFUSE_LOGERR ("%s: fork: %s", progname, strerror (errno));
+ goto out_restore;
+ }
+ if (res == 0) {
+ char templ[] = "/tmp/fusermountXXXXXX";
+ char *tmp;
+
+ sigprocmask (SIG_SETMASK, &oldmask, NULL);
+ setuid (geteuid ());
+
+ /*
+ * hide in a directory, where mount isn't able to resolve
+ * fsname as a valid path
+ */
+ tmp = mkdtemp (templ);
+ if (!tmp) {
+ GFFUSE_LOGERR ("%s: failed to create temporary directory",
+ progname);
+ exit (1);
+ }
+ if (chdir (tmp)) {
+ GFFUSE_LOGERR ("%s: failed to chdir to %s: %s",
+ progname, tmp, strerror (errno));
+ exit (1);
+ }
+ rmdir (tmp);
+ execl (_PATH_MOUNT, _PATH_MOUNT, "-i", "-f", "-t", type,
+ "-o", opts, fsname, mnt, NULL);
+ GFFUSE_LOGERR ("%s: failed to execute %s: %s",
+ progname, _PATH_MOUNT, strerror (errno));
+ exit (1);
+ }
+
+ res = waitpid (res, &status, 0);
+ if (res == -1)
+ GFFUSE_LOGERR ("%s: waitpid: %s", progname, strerror (errno));
+ res = (res != -1 && status == 0) ? 0 : -1;
+
+ out_restore:
+ sigprocmask (SIG_SETMASK, &oldmask, NULL);
+ return res;
+}
+
+char *
+fuse_mnt_resolve_path (const char *progname, const char *orig)
+{
+ char buf[PATH_MAX];
+ char *copy;
+ char *dst;
+ char *end;
+ char *lastcomp;
+ const char *toresolv;
+
+ if (!orig[0]) {
+ GFFUSE_LOGERR ("%s: invalid mountpoint '%s'", progname, orig);
+ return NULL;
+ }
+
+ copy = strdup (orig);
+ if (copy == NULL) {
+ GFFUSE_LOGERR ("%s: failed to allocate memory", progname);
+ return NULL;
+ }
+
+ toresolv = copy;
+ lastcomp = NULL;
+ for (end = copy + strlen (copy) - 1; end > copy && *end == '/'; end --);
+ if (end[0] != '/') {
+ char *tmp;
+ end[1] = '\0';
+ tmp = strrchr (copy, '/');
+ if (tmp == NULL) {
+ lastcomp = copy;
+ toresolv = ".";
+ } else {
+ lastcomp = tmp + 1;
+ if (tmp == copy)
+ toresolv = "/";
+ }
+ if (strcmp (lastcomp, ".") == 0 || strcmp (lastcomp, "..") == 0) {
+ lastcomp = NULL;
+ toresolv = copy;
+ }
+ else if (tmp)
+ tmp[0] = '\0';
+ }
+ if (realpath (toresolv, buf) == NULL) {
+ GFFUSE_LOGERR ("%s: bad mount point %s: %s", progname, orig,
+ strerror (errno));
+ FREE (copy);
+ return NULL;
+ }
+ if (lastcomp == NULL)
+ dst = strdup (buf);
+ else {
+ dst = (char *) MALLOC (strlen (buf) + 1 + strlen (lastcomp) + 1);
+ if (dst) {
+ unsigned buflen = strlen (buf);
+ if (buflen && buf[buflen-1] == '/')
+ sprintf (dst, "%s%s", buf, lastcomp);
+ else
+ sprintf (dst, "%s/%s", buf, lastcomp);
+ }
+ }
+ FREE (copy);
+ if (dst == NULL)
+ GFFUSE_LOGERR ("%s: failed to allocate memory", progname);
+ return dst;
+}
+
+int
+fuse_mnt_umount (const char *progname, const char *abs_mnt,
+ const char *rel_mnt, int lazy)
+{
+ int res;
+ int status;
+ sigset_t blockmask;
+ sigset_t oldmask;
+
+ if (!mtab_needs_update (abs_mnt)) {
+ res = umount2 (rel_mnt, lazy ? 2 : 0);
+ if (res == -1)
+ GFFUSE_LOGERR ("%s: failed to unmount %s: %s",
+ progname, abs_mnt, strerror (errno));
+ return res;
+ }
+
+ sigemptyset (&blockmask);
+ sigaddset (&blockmask, SIGCHLD);
+ res = sigprocmask (SIG_BLOCK, &blockmask, &oldmask);
+ if (res == -1) {
+ GFFUSE_LOGERR ("%s: sigprocmask: %s", progname,
+ strerror (errno));
+ return -1;
+ }
+
+ res = fork ();
+ if (res == -1) {
+ GFFUSE_LOGERR ("%s: fork: %s", progname, strerror (errno));
+ goto out_restore;
+ }
+ if (res == 0) {
+ sigprocmask (SIG_SETMASK, &oldmask, NULL);
+ setuid (geteuid ());
+ execl ("/bin/umount", "/bin/umount", "-i", rel_mnt,
+ lazy ? "-l" : NULL, NULL);
+ GFFUSE_LOGERR ("%s: failed to execute /bin/umount: %s",
+ progname, strerror (errno));
+ exit (1);
+ }
+ res = waitpid (res, &status, 0);
+ if (res == -1)
+ GFFUSE_LOGERR ("%s: waitpid: %s", progname, strerror (errno));
+
+ if (status != 0)
+ res = -1;
+
+ out_restore:
+ sigprocmask (SIG_SETMASK, &oldmask, NULL);
+ return res;
+}