/**
* mnt_update_force_rdonly:
* @upd: update
* @rdonly: is read-only?
*
* Returns: 0 on success and negative number in case of error.
*/
int mnt_update_force_rdonly(struct libmnt_update *upd, int rdonly)
{
int rc = 0;
if (!upd || !upd->fs)
return -EINVAL;
if (rdonly && (upd->mountflags & MS_RDONLY))
return 0;
if (!rdonly && !(upd->mountflags & MS_RDONLY))
return 0;
if (!upd->userspace_only) {
/* /etc/mtab -- we care about VFS options there */
const char *o = mnt_fs_get_options(upd->fs);
char *n = o ? strdup(o) : NULL;
if (n)
mnt_optstr_remove_option(&n, rdonly ? "rw" : "ro");
if (!mnt_optstr_prepend_option(&n, rdonly ? "ro" : "rw", NULL))
rc = mnt_fs_set_options(upd->fs, n);
free(n);
}
if (rdonly)
upd->mountflags &= ~MS_RDONLY;
else
upd->mountflags |= MS_RDONLY;
return rc;
}
/**
* mnt_context_next_umount:
* @cxt: context
* @itr: iterator
* @fs: returns the current filesystem
* @mntrc: returns the return code from mnt_context_umount()
* @ignored: returns 1 for not matching
*
* This function tries to umount the next filesystem from mtab (as returned by
* mnt_context_get_mtab()).
*
* You can filter out filesystems by:
* mnt_context_set_options_pattern() to simulate umount -a -O pattern
* mnt_context_set_fstype_pattern() to simulate umount -a -t pattern
*
* If the filesystem is not mounted or does not match the defined criteria,
* then the function mnt_context_next_umount() returns zero, but the @ignored is
* non-zero. Note that the root filesystem is always ignored.
*
* If umount(2) syscall or umount.type helper failed, then the
* mnt_context_next_umount() function returns zero, but the @mntrc is non-zero.
* Use also mnt_context_get_status() to check if the filesystem was
* successfully umounted.
*
* Returns: 0 on success,
* <0 in case of error (!= umount(2) errors)
* 1 at the end of the list.
*/
int mnt_context_next_umount(struct libmnt_context *cxt,
struct libmnt_iter *itr,
struct libmnt_fs **fs,
int *mntrc,
int *ignored)
{
struct libmnt_table *mtab;
const char *tgt;
int rc;
if (ignored)
*ignored = 0;
if (mntrc)
*mntrc = 0;
if (!cxt || !fs || !itr)
return -EINVAL;
rc = mnt_context_get_mtab(cxt, &mtab);
cxt->mtab = NULL; /* do not reset mtab */
mnt_reset_context(cxt);
cxt->mtab = mtab;
if (rc)
return rc;
do {
rc = mnt_table_next_fs(mtab, itr, fs);
if (rc != 0)
return rc; /* no more filesystems (or error) */
tgt = mnt_fs_get_target(*fs);
} while (!tgt);
DBG(CXT, ul_debugobj(cxt, "next-umount: trying %s [fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]", tgt,
mnt_fs_get_fstype(*fs), cxt->fstype_pattern, mnt_fs_get_options(*fs), cxt->optstr_pattern));
/* ignore filesystems which don't match options patterns */
if ((cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
cxt->fstype_pattern)) ||
/* ignore filesystems which don't match type patterns */
(cxt->optstr_pattern && !mnt_fs_match_options(*fs,
cxt->optstr_pattern))) {
if (ignored)
*ignored = 1;
DBG(CXT, ul_debugobj(cxt, "next-umount: not-match"));
return 0;
}
rc = mnt_context_set_fs(cxt, *fs);
if (rc)
return rc;
rc = mnt_context_umount(cxt);
if (mntrc)
*mntrc = rc;
return 0;
}
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;
}
/* mtab and fstab update -- returns zero on success
*/
static int fprintf_mtab_fs(FILE *f, struct libmnt_fs *fs)
{
const char *o, *src, *fstype;
char *m1, *m2, *m3, *m4;
int rc;
assert(fs);
assert(f);
src = mnt_fs_get_source(fs);
fstype = mnt_fs_get_fstype(fs);
o = mnt_fs_get_options(fs);
m1 = src ? mangle(src) : "none";
m2 = mangle(mnt_fs_get_target(fs));
m3 = fstype ? mangle(fstype) : "none";
m4 = o ? mangle(o) : "rw";
if (m1 && m2 && m3 && m4) {
rc = fprintf(f, "%s %s %s %s %d %d\n",
m1, m2, m3, m4,
mnt_fs_get_freq(fs),
mnt_fs_get_passno(fs));
if (rc > 0)
rc = 0;
} else
rc = -ENOMEM;
if (src)
free(m1);
free(m2);
if (fstype)
free(m3);
if (o)
free(m4);
return rc;
}
/**
* mnt_context_next_mount:
* @cxt: context
* @itr: iterator
* @fs: returns the current filesystem
* @mntrc: returns the return code from mnt_context_mount()
* @ignored: returns 1 for not matching and 2 for already mounted filesystems
*
* This function tries to mount the next filesystem from fstab (as returned by
* mnt_context_get_fstab()). See also mnt_context_set_fstab().
*
* You can filter out filesystems by:
* mnt_context_set_options_pattern() to simulate mount -a -O pattern
* mnt_context_set_fstype_pattern() to simulate mount -a -t pattern
*
* If the filesystem is already mounted or does not match defined criteria,
* then the mnt_context_next_mount() function returns zero, but the @ignored is
* non-zero. Note that the root filesystem and filesystems with "noauto" option
* are always ignored.
*
* If mount(2) syscall or mount.type helper failed, then the
* mnt_context_next_mount() function returns zero, but the @mntrc is non-zero.
* Use also mnt_context_get_status() to check if the filesystem was
* successfully mounted.
*
* Returns: 0 on success,
* <0 in case of error (!= mount(2) errors)
* 1 at the end of the list.
*/
int mnt_context_next_mount(struct libmnt_context *cxt,
struct libmnt_iter *itr,
struct libmnt_fs **fs,
int *mntrc,
int *ignored)
{
struct libmnt_table *fstab, *mtab;
const char *o, *tgt;
int rc, mounted = 0;
if (ignored)
*ignored = 0;
if (mntrc)
*mntrc = 0;
if (!cxt || !fs || !itr)
return -EINVAL;
mtab = cxt->mtab;
cxt->mtab = NULL; /* do not reset mtab */
mnt_reset_context(cxt);
cxt->mtab = mtab;
rc = mnt_context_get_fstab(cxt, &fstab);
if (rc)
return rc;
rc = mnt_table_next_fs(fstab, itr, fs);
if (rc != 0)
return rc; /* more filesystems (or error) */
o = mnt_fs_get_user_options(*fs);
tgt = mnt_fs_get_target(*fs);
DBG(CXT, mnt_debug_h(cxt, "next-mount: trying %s", tgt));
/* ignore swap */
if (mnt_fs_is_swaparea(*fs) ||
/* ignore root filesystem */
(tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) ||
/* ignore noauto filesystems */
(o && mnt_optstr_get_option(o, "noauto", NULL, NULL) == 0) ||
/* ignore filesystems not match with options patterns */
(cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
cxt->fstype_pattern)) ||
/* ignore filesystems not match with type patterns */
(cxt->optstr_pattern && !mnt_fs_match_options(*fs,
cxt->optstr_pattern))) {
if (ignored)
*ignored = 1;
DBG(CXT, mnt_debug_h(cxt, "next-mount: not-match "
"[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]",
mnt_fs_get_fstype(*fs),
cxt->fstype_pattern,
mnt_fs_get_options(*fs),
cxt->optstr_pattern));
return 0;
}
/* ignore already mounted filesystems */
rc = mnt_context_is_fs_mounted(cxt, *fs, &mounted);
if (rc)
return rc;
if (mounted) {
if (ignored)
*ignored = 2;
return 0;
}
if (mnt_context_is_fork(cxt)) {
rc = mnt_fork_context(cxt);
if (rc)
return rc; /* fork error */
if (mnt_context_is_parent(cxt)) {
return 0; /* parent */
}
}
/* child or non-forked */
rc = mnt_context_set_fs(cxt, *fs);
if (!rc) {
rc = mnt_context_mount(cxt);
if (mntrc)
*mntrc = rc;
}
if (mnt_context_is_child(cxt)) {
DBG(CXT, mnt_debug_h(cxt, "next-mount: child exit [rc=%d]", rc));
DBG_FLUSH;
exit(rc);
}
return 0;
}