static int fprintf_utab_fs(FILE *f, struct libmnt_fs *fs)
{
char *p;
int rc = 0;
assert(fs);
assert(f);
if (!fs || !f)
return -EINVAL;
p = mangle(mnt_fs_get_source(fs));
if (p) {
rc = fprintf(f, "SRC=%s ", p);
free(p);
}
if (rc >= 0) {
p = mangle(mnt_fs_get_target(fs));
if (p) {
rc = fprintf(f, "TARGET=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_root(fs));
if (p) {
rc = fprintf(f, "ROOT=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_bindsrc(fs));
if (p) {
rc = fprintf(f, "BINDSRC=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_attributes(fs));
if (p) {
rc = fprintf(f, "ATTRS=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_user_options(fs));
if (p) {
rc = fprintf(f, "OPTS=%s", p);
free(p);
}
}
if (rc >= 0)
rc = fprintf(f, "\n");
if (rc > 0)
rc = 0; /* success */
return rc;
}
/*
* Retrieve mount options from mtab (or /dev/.mount/utab) called from umount.nfs.
*
* The result can passed to free().
*/
char *retrieve_mount_options(struct libmnt_fs *fs)
{
const char *opts;
if (!fs)
return NULL;
opts = mnt_fs_get_attributes(fs); /* /dev/.mount/utab */
if (opts)
return strdup(opts);
return mnt_fs_strdup_options(fs); /* /etc/mtab */
}
/*
* This function uses @uf to found corresponding record in @tb, then the record
* from @tb is updated (user specific mount options are added).
*
* Note that @uf must contain only user specific mount options instead of
* VFS options (note that FS options are ignored).
*
* Returns modified filesystem (from @tb) or NULL.
*/
static struct libmnt_fs *mnt_table_merge_user_fs(struct libmnt_table *tb, struct libmnt_fs *uf)
{
struct libmnt_fs *fs;
struct libmnt_iter itr;
const char *optstr, *src, *target, *root, *attrs;
assert(tb);
assert(uf);
if (!tb || !uf)
return NULL;
DBG(TAB, mnt_debug_h(tb, "merging user fs"));
src = mnt_fs_get_srcpath(uf);
target = mnt_fs_get_target(uf);
optstr = mnt_fs_get_user_options(uf);
attrs = mnt_fs_get_attributes(uf);
root = mnt_fs_get_root(uf);
if (!src || !target || !root || (!attrs && !optstr))
return NULL;
mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
while(mnt_table_next_fs(tb, &itr, &fs) == 0) {
const char *s = mnt_fs_get_srcpath(fs),
*t = mnt_fs_get_target(fs),
*r = mnt_fs_get_root(fs);
if (fs->flags & MNT_FS_MERGED)
continue;
if (s && t && r && !strcmp(t, target) &&
!strcmp(s, src) && !strcmp(r, root))
break;
}
if (fs) {
DBG(TAB, mnt_debug_h(tb, "found fs -- appending user optstr"));
mnt_fs_append_options(fs, optstr);
mnt_fs_append_attributes(fs, attrs);
mnt_fs_set_bindsrc(fs, mnt_fs_get_bindsrc(uf));
fs->flags |= MNT_FS_MERGED;
DBG(TAB, mnt_debug_h(tb, "found fs:"));
DBG(TAB, mnt_fs_print_debug(fs, stderr));
}
return fs;
}
static int update_modify_options(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb = NULL;
int rc = 0;
struct libmnt_fs *fs;
assert(upd);
assert(upd->fs);
DBG(UPDATE, mnt_debug_h(upd, "%s: modify options", upd->filename));
fs = upd->fs;
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return rc;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB);
if (tb) {
struct libmnt_fs *cur = mnt_table_find_target(tb,
mnt_fs_get_target(fs),
MNT_ITER_BACKWARD);
if (cur) {
if (upd->userspace_only)
rc = mnt_fs_set_attributes(cur, mnt_fs_get_attributes(fs));
if (!rc)
rc = mnt_fs_set_options(cur, mnt_fs_get_options(fs));
if (!rc)
rc = update_table(upd, tb);
}
}
if (lc)
mnt_unlock_file(lc);
mnt_free_table(tb);
return rc;
}
/*
* Allocates utab entry (upd->fs) for mount/remount. This function should be
* called *before* mount(2) syscall. The @fs is used as a read-only template.
*
* Returns: 0 on success, negative number on error, 1 if utabs update is
* unnecessary.
*/
static int utab_new_entry(struct libmnt_update *upd, struct libmnt_fs *fs,
unsigned long mountflags)
{
int rc = 0;
const char *o = NULL, *a = NULL;
char *u = NULL;
assert(fs);
assert(upd);
assert(upd->fs == NULL);
assert(!(mountflags & MS_MOVE));
DBG(UPDATE, mnt_debug("prepare utab entry"));
o = mnt_fs_get_user_options(fs);
a = mnt_fs_get_attributes(fs);
upd->fs = NULL;
if (o) {
/* remove non-mtab options */
rc = mnt_optstr_get_options(o, &u,
mnt_get_builtin_optmap(MNT_USERSPACE_MAP),
MNT_NOMTAB);
if (rc)
goto err;
}
if (!u && !a) {
DBG(UPDATE, mnt_debug("utab entry unnecessary (no options)"));
return 1;
}
/* allocate the entry */
upd->fs = mnt_copy_fs(NULL, fs);
if (!upd->fs) {
rc = -ENOMEM;
goto err;
}
rc = mnt_fs_set_options(upd->fs, u);
if (rc)
goto err;
rc = mnt_fs_set_attributes(upd->fs, a);
if (rc)
goto err;
if (!(mountflags & MS_REMOUNT)) {
rc = set_fs_root(upd, fs, mountflags);
if (rc)
goto err;
}
free(u);
DBG(UPDATE, mnt_debug("utab entry OK"));
return 0;
err:
free(u);
mnt_free_fs(upd->fs);
upd->fs = NULL;
return rc;
}
