libmount: add mnt_fs_prepend_optstr()

Signed-off-by: Karel Zak <kzak@redhat.com>

5 files changed, 38 insertions, 8 deletions

diff --git a/shlibs/mount/src/fs.c b/shlibs/mount/src/fs.c
index 11dbf6457..fad5da890 100644
--- a/shlibs/mount/src/fs.c
+++ b/shlibs/mount/src/fs.c
@@ -484,11 +484,39 @@ int mnt_fs_append_optstr(mnt_fs *fs, const char *optstr)
 }
 
 /**
+ * mnt_fs_prepend_optstr:
+ * @fs: fstab/mtab/mountinfo entry
+ * @optstr: mount options
+ *
+ * Returns: 0 on success or negative number in case of error.
+ */
+int mnt_fs_prepend_optstr(mnt_fs *fs, const char *optstr)
+{
+	char *v = NULL, *f = NULL;
+	int rc;
+
+	assert(fs);
+
+	if (!fs)
+		return -EINVAL;
+	if (!optstr)
+		return 0;
+
+	rc = mnt_split_optstr((char *) optstr, NULL, &v, &f, 0, 0);
+	if (!rc)
+		rc = mnt_optstr_prepend_option(&fs->optstr, optstr, NULL);
+	if (!rc && v)
+		rc = mnt_optstr_prepend_option(&fs->vfs_optstr, v, NULL);
+	if (!rc && f)
+	       rc = mnt_optstr_prepend_option(&fs->fs_optstr, f, NULL);
+
+	return rc;
+}
+
+/**
  * mnt_fs_get_fs_optstr:
  * @fs: fstab/mtab/mountinfo entry pointer
  *
- * This function works for "mountinfo" files only.
- *
  * Returns: pointer to superblock (fs-depend) mount option string or NULL.
  */
 const char *mnt_fs_get_fs_optstr(mnt_fs *fs)
@@ -501,8 +529,6 @@ const char *mnt_fs_get_fs_optstr(mnt_fs *fs)
  * mnt_fs_get_vfs_optstr:
  * @fs: fstab/mtab entry pointer
  *
- * This function works for "mountinfo" files only.
- *
  * Returns: pointer to fs-independent (VFS) mount option string or NULL.
  */
 const char *mnt_fs_get_vfs_optstr(mnt_fs *fs)
diff --git a/shlibs/mount/src/mount.h.in b/shlibs/mount/src/mount.h.in
index 559f59a41..b35d64524 100644
--- a/shlibs/mount/src/mount.h.in
+++ b/shlibs/mount/src/mount.h.in
@@ -209,6 +209,7 @@ extern int mnt_fs_set_fstype(mnt_fs *ent, const char *fstype);
 extern const char *mnt_fs_get_optstr(mnt_fs *ent);
 extern int mnt_fs_set_optstr(mnt_fs *ent, const char *optstr);
 extern int mnt_fs_append_optstr(mnt_fs *fs, const char *optstr);
+extern int mnt_fs_prepend_optstr(mnt_fs *fs, const char *optstr);
 extern int mnt_fs_append_userspace_optstr(mnt_fs *fs, const char *optstr);
 extern const char *mnt_fs_get_vfs_optstr(mnt_fs *ent);
 extern const char *mnt_fs_get_fs_optstr(mnt_fs *ent);
diff --git a/shlibs/mount/src/mount.sym b/shlibs/mount/src/mount.sym
index af0cc88fb..d0fa3085b 100644
--- a/shlibs/mount/src/mount.sym
+++ b/shlibs/mount/src/mount.sym
@@ -19,6 +19,7 @@ global:
 	mnt_free_optls;
 	mnt_free_tab;
 	mnt_fs_append_optstr;
+	mnt_fs_prepend_optstr;
 	mnt_fs_append_userspace_optstr;
 	mnt_fs_get_devno;
 	mnt_fs_get_freq;
diff --git a/shlibs/mount/src/tab_parse.c b/shlibs/mount/src/tab_parse.c
index 9c65c57ed..e782b2781 100644
--- a/shlibs/mount/src/tab_parse.c
+++ b/shlibs/mount/src/tab_parse.c
@@ -116,6 +116,7 @@ static int next_number(char **s, int *num)
 static int mnt_tab_parse_file_line(mnt_fs *fs, char *s)
 {
 	int rc = 0;
+	char *p = NULL;
 
 	/* SOURCE */
 	rc =__mnt_fs_set_source(fs, next_word(&s));
@@ -133,8 +134,8 @@ static int mnt_tab_parse_file_line(mnt_fs *fs, char *s)
 		goto err;
 
 	/* OPTS */
-	fs->optstr = next_word(&s);
-	if (!fs->optstr)
+	p = next_word(&s);
+	if (!p || mnt_fs_set_optstr(fs, p))
 		goto err;
 
 	/* default */
@@ -151,6 +152,7 @@ static int mnt_tab_parse_file_line(mnt_fs *fs, char *s)
 
 	return 0;
 err:
+	free(p);
 	if (rc)
 		return rc;
 	return errno == ENOMEM ? -ENOMEM : -EINVAL;
diff --git a/shlibs/mount/src/tab_update.c b/shlibs/mount/src/tab_update.c
index c023777cb..3d60f46b4 100644
--- a/shlibs/mount/src/tab_update.c
+++ b/shlibs/mount/src/tab_update.c
@@ -585,16 +585,16 @@ int mnt_prepare_update(mnt_update *upd)
 		return 0;
 
 	/*
-	 * A) classic /etc/mtab
+	 * A) classic /etc/mtab or /etc/fstab update
 	 */
 	if (upd->format != MNT_FMT_MOUNTINFO)
 		return 0;
 
 	/*
 	 * B) /var/run/mount/mountinfo
+	 *  - remove all non-userspace mount options
 	 */
 	if (upd->mountflags & MS_REMOUNT) {
-		/* remount */
 		if (mnt_split_optstr(o, &u, NULL, NULL, MNT_NOMTAB, 0))
 			goto err;
 		if (__mnt_fs_set_optstr(upd->fs, u, FALSE))