static int prepare_helper_from_options(struct libmnt_context *cxt,
const char *name)
{
char *suffix = NULL;
const char *opts;
size_t valsz;
if (mnt_context_is_nohelpers(cxt))
return 0;
opts = mnt_fs_get_user_options(cxt->fs);
if (!opts)
return 0;
if (mnt_optstr_get_option(opts, name, &suffix, &valsz))
return 0;
suffix = strndup(suffix, valsz);
if (!suffix)
return -ENOMEM;
DBG(CXT, mnt_debug_h(cxt, "umount: umount.%s %s requested", suffix, name));
return mnt_context_prepare_helper(cxt, "umount", suffix);
}
/*
* The default is to use fstype from cxt->fs, this could be overwritten by
* @try_type argument.
*
* Returns: 0 on success,
* >0 in case of mount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
static int do_mount(struct libmnt_context *cxt, const char *try_type)
{
int rc = 0;
const char *src, *target, *type;
unsigned long flags;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (try_type && !cxt->helper) {
rc = mnt_context_prepare_helper(cxt, "mount", try_type);
if (!rc)
return rc;
}
if (cxt->helper)
return exec_helper(cxt);
flags = cxt->mountflags;
src = mnt_fs_get_srcpath(cxt->fs);
target = mnt_fs_get_target(cxt->fs);
if (!src || !target)
return -EINVAL;
type = try_type ? : mnt_fs_get_fstype(cxt->fs);
if (!(flags & MS_MGC_MSK))
flags |= MS_MGC_VAL;
DBG(CXT, mnt_debug_h(cxt, "%smount(2) "
"[source=%s, target=%s, type=%s, "
" mountflags=0x%08lx, mountdata=%s]",
(cxt->flags & MNT_FL_FAKE) ? "(FAKE) " : "",
src, target, type,
flags, cxt->mountdata ? "yes" : "<none>"));
if (cxt->flags & MNT_FL_FAKE)
cxt->syscall_status = 0;
else {
if (mount(src, target, type, flags, cxt->mountdata)) {
cxt->syscall_status = -errno;
DBG(CXT, mnt_debug_h(cxt, "mount(2) failed [errno=%d %m]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
DBG(CXT, mnt_debug_h(cxt, "mount(2) success"));
cxt->syscall_status = 0;
}
if (try_type && cxt->update) {
struct libmnt_fs *fs = mnt_update_get_fs(cxt->update);
if (fs)
rc = mnt_fs_set_fstype(fs, try_type);
}
return rc;
}
/**
* mnt_context_prepare_umount:
* @cxt: mount context
*
* Prepare context for umounting, unnecessary for mnt_context_umount().
*
* Returns: 0 on success, and negative number in case of error.
*/
int mnt_context_prepare_umount(struct libmnt_context *cxt)
{
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper_exec_status == 1);
assert(cxt->syscall_status == 1);
if (!cxt || !cxt->fs || mnt_fs_is_swaparea(cxt->fs))
return -EINVAL;
if (!mnt_context_get_source(cxt) && !mnt_context_get_target(cxt))
return -EINVAL;
if (cxt->flags & MNT_FL_PREPARED)
return 0;
free(cxt->helper); /* be paranoid */
cxt->helper = NULL;
cxt->action = MNT_ACT_UMOUNT;
rc = lookup_umount_fs(cxt);
if (!rc)
rc = mnt_context_merge_mflags(cxt);
if (!rc)
rc = evaluate_permissions(cxt);
if (!rc && !cxt->helper) {
if (cxt->user_mountflags & MNT_MS_HELPER)
/* on helper= mount option based helper */
rc = prepare_helper_from_options(cxt, "helper");
if (!rc && !cxt->helper)
/* on fstype based helper */
rc = mnt_context_prepare_helper(cxt, "umount", NULL);
}
if (!rc && (cxt->user_mountflags & MNT_MS_LOOP))
/* loop option explicitly specified in mtab, detach this loop */
mnt_context_enable_loopdel(cxt, TRUE);
if (!rc && mnt_context_is_loopdel(cxt) && cxt->fs) {
const char *src = mnt_fs_get_srcpath(cxt->fs);
if (src && (!is_loopdev(src) || loopdev_is_autoclear(src)))
mnt_context_enable_loopdel(cxt, FALSE);
}
if (rc) {
DBG(CXT, mnt_debug_h(cxt, "umount: preparing failed"));
return rc;
}
cxt->flags |= MNT_FL_PREPARED;
return rc;
}
/**
* mnt_context_prepare_mount:
* @cxt: context
*
* Prepare context for mounting, unnecessary for mnt_context_mount().
*
* Returns: negative number on error, zero on success
*/
int mnt_context_prepare_mount(struct libmnt_context *cxt)
{
int rc = -EINVAL;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper_exec_status == 1);
assert(cxt->syscall_status == 1);
if (!cxt || !cxt->fs || mnt_fs_is_swaparea(cxt->fs))
return -EINVAL;
if (!mnt_fs_get_source(cxt->fs) && !mnt_fs_get_target(cxt->fs))
return -EINVAL;
if (cxt->flags & MNT_FL_PREPARED)
return 0;
cxt->action = MNT_ACT_MOUNT;
DBG(CXT, mnt_debug_h(cxt, "mount: preparing"));
/* TODO: fstab is unnecessary for MS_{MOVE,BIND,STARED,...} */
rc = mnt_context_apply_fstab(cxt);
if (!rc)
rc = mnt_context_merge_mflags(cxt);
if (!rc)
rc = evaluate_permissions(cxt);
if (!rc)
rc = fix_optstr(cxt);
if (!rc)
rc = mnt_context_prepare_srcpath(cxt);
if (!rc)
rc = mnt_context_prepare_target(cxt);
if (!rc)
rc = mnt_context_guess_fstype(cxt);
if (!rc)
rc = mnt_context_prepare_helper(cxt, "mount", NULL);
if (rc) {
DBG(CXT, mnt_debug_h(cxt, "mount: preparing failed"));
return rc;
}
cxt->flags |= MNT_FL_PREPARED;
return rc;
}
/*
* The default is to use fstype from cxt->fs, this could be overwritten by
* @try_type argument.
*
* Returns: 0 on success,
* >0 in case of mount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
static int do_mount(struct libmnt_context *cxt, const char *try_type)
{
int rc = 0;
const char *src, *target, *type;
unsigned long flags;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (try_type && !cxt->helper) {
rc = mnt_context_prepare_helper(cxt, "mount", try_type);
if (rc)
return rc;
}
if (cxt->helper)
return exec_helper(cxt);
flags = cxt->mountflags;
src = mnt_fs_get_srcpath(cxt->fs);
target = mnt_fs_get_target(cxt->fs);
if (!target)
return -EINVAL;
if (!src) {
/* unnecessary, should be already resolved in
* mnt_context_prepare_srcpath(), but for sure... */
DBG(CXT, mnt_debug_h(cxt, "WARNING: source is NULL -- using \"none\"!"));
src = "none";
}
type = try_type ? : mnt_fs_get_fstype(cxt->fs);
if (!(flags & MS_MGC_MSK))
flags |= MS_MGC_VAL;
DBG(CXT, mnt_debug_h(cxt, "%smount(2) "
"[source=%s, target=%s, type=%s, "
" mountflags=0x%08lx, mountdata=%s]",
mnt_context_is_fake(cxt) ? "(FAKE) " : "",
src, target, type,
flags, cxt->mountdata ? "yes" : "<none>"));
if (mnt_context_is_fake(cxt))
cxt->syscall_status = 0;
else {
if (mount(src, target, type, flags, cxt->mountdata)) {
cxt->syscall_status = -errno;
DBG(CXT, mnt_debug_h(cxt, "mount(2) failed [errno=%d %m]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
DBG(CXT, mnt_debug_h(cxt, "mount(2) success"));
cxt->syscall_status = 0;
}
if (try_type && cxt->update) {
struct libmnt_fs *fs = mnt_update_get_fs(cxt->update);
if (fs)
rc = mnt_fs_set_fstype(fs, try_type);
}
return rc;
}
