/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* mountP.h - private library header file
*
* This file is part of libmount from util-linux project.
*
* Copyright (C) 2008-2018 Karel Zak <kzak@redhat.com>
*
* libmount is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*/
#ifndef _LIBMOUNT_PRIVATE_H
#define _LIBMOUNT_PRIVATE_H
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <unistd.h>
#include <stdio.h>
#include <stdarg.h>
#include "c.h"
#include "list.h"
#include "debug.h"
#include "libmount.h"
/*
* Debug
*/
#define MNT_DEBUG_HELP (1 << 0)
#define MNT_DEBUG_INIT (1 << 1)
#define MNT_DEBUG_CACHE (1 << 2)
#define MNT_DEBUG_OPTIONS (1 << 3)
#define MNT_DEBUG_LOCKS (1 << 4)
#define MNT_DEBUG_TAB (1 << 5)
#define MNT_DEBUG_FS (1 << 6)
#define MNT_DEBUG_UPDATE (1 << 7)
#define MNT_DEBUG_UTILS (1 << 8)
#define MNT_DEBUG_CXT (1 << 9)
#define MNT_DEBUG_DIFF (1 << 10)
#define MNT_DEBUG_MONITOR (1 << 11)
#define MNT_DEBUG_BTRFS (1 << 12)
#define MNT_DEBUG_LOOP (1 << 13)
#define MNT_DEBUG_ALL 0xFFFF
UL_DEBUG_DECLARE_MASK(libmount);
#define DBG(m, x) __UL_DBG(libmount, MNT_DEBUG_, m, x)
#define ON_DBG(m, x) __UL_DBG_CALL(libmount, MNT_DEBUG_, m, x)
#define DBG_FLUSH __UL_DBG_FLUSH(libmount, MNT_DEBUG_)
#define UL_DEBUG_CURRENT_MASK UL_DEBUG_MASK(libmount)
#include "debugobj.h"
/*
* NLS -- the library has to be independent on main program, so define
* UL_TEXTDOMAIN_EXPLICIT before you include nls.h.
*
* Now we use util-linux.po (=PACKAGE), rather than maintain the texts
* in the separate libmount.po file.
*/
#define LIBMOUNT_TEXTDOMAIN PACKAGE
#define UL_TEXTDOMAIN_EXPLICIT LIBMOUNT_TEXTDOMAIN
#include "nls.h"
/* extension for files in the directory */
#define MNT_MNTTABDIR_EXT ".fstab"
/* library private paths */
#define MNT_RUNTIME_TOPDIR "/run"
#define MNT_RUNTIME_TOPDIR_OLD "/dev"
#define MNT_PATH_UTAB MNT_RUNTIME_TOPDIR "/mount/utab"
#define MNT_PATH_UTAB_OLD MNT_RUNTIME_TOPDIR_OLD "/.mount/utab"
#define MNT_UTAB_HEADER "# libmount utab file\n"
#ifdef TEST_PROGRAM
struct libmnt_test {
const char *name;
int (*body)(struct libmnt_test *ts, int argc, char *argv[]);
const char *usage;
};
/* test.c */
extern int mnt_run_test(struct libmnt_test *tests, int argc, char *argv[]);
#endif
/* utils.c */
extern int mnt_valid_tagname(const char *tagname);
extern int append_string(char **a, const char *b);
extern const char *mnt_statfs_get_fstype(struct statfs *vfs);
extern int is_file_empty(const char *name);
extern int mnt_is_readonly(const char *path)
__attribute__((nonnull));
extern int mnt_parse_offset(const char *str, size_t len, uintmax_t *res);
extern int mnt_chdir_to_parent(const char *target, char **filename);
extern char *mnt_get_username(const uid_t uid);
extern int mnt_get_uid(const char *username, uid_t *uid);
extern int mnt_get_gid(const char *groupname, gid_t *gid);
extern int mnt_in_group(gid_t gid);
extern int mnt_open_uniq_filename(const char *filename, char **name);
extern int mnt_has_regular_utab(const char **utab, int *writable);
extern const char *mnt_get_utab_path(void);
extern int mnt_get_filesystems(char ***filesystems, const char *pattern);
extern void mnt_free_filesystems(char **filesystems);
extern char *mnt_get_kernel_cmdline_option(const char *name);
extern int mnt_stat_mountpoint(const char *target, struct stat *st);
/* tab.c */
extern int is_mountinfo(struct libmnt_table *tb);
extern int mnt_table_set_parser_fltrcb( struct libmnt_table *tb,
int (*cb)(struct libmnt_fs *, void *),
void *data);
extern int __mnt_table_parse_mtab(struct libmnt_table *tb,
const char *filename,
struct libmnt_table *u_tb);
extern struct libmnt_fs *mnt_table_get_fs_root(struct libmnt_table *tb,
struct libmnt_fs *fs,
unsigned long mountflags,
char **fsroot);
/*
* Generic iterator
*/
struct libmnt_iter {
struct list_head *p; /* current position */
struct list_head *head; /* start position */
int direction; /* MNT_ITER_{FOR,BACK}WARD */
};
#define IS_ITER_FORWARD(_i) ((_i)->direction == MNT_ITER_FORWARD)
#define IS_ITER_BACKWARD(_i) ((_i)->direction == MNT_ITER_BACKWARD)
#define MNT_ITER_INIT(itr, list) \
do { \
(itr)->p = IS_ITER_FORWARD(itr) ? \
(list)->next : (list)->prev; \
(itr)->head = (list); \
} while(0)
#define MNT_ITER_ITERATE(itr, res, restype, member) \
do { \
res = list_entry((itr)->p, restype, member); \
(itr)->p = IS_ITER_FORWARD(itr) ? \
(itr)->p->next : (itr)->p->prev; \
} while(0)
/*
* This struct represents one entry in a mtab/fstab/mountinfo file.
* (note that fstab[1] means the first column from fstab, and so on...)
*/
struct libmnt_fs {
struct list_head ents;
struct libmnt_table *tab;
int refcount; /* reference counter */
int id; /* mountinfo[1]: ID */
int parent; /* mountinfo[2]: parent */
dev_t devno; /* mountinfo[3]: st_dev */
char *bindsrc; /* utab, full path from fstab[1] for bind mounts */
char *source; /* fstab[1], mountinfo[10], swaps[1]:
* source dev, file, dir or TAG */
char *tagname; /* fstab[1]: tag name - "LABEL", "UUID", ..*/
char *tagval; /* tag value */
char *root; /* mountinfo[4]: root of the mount within the FS */
char *target; /* mountinfo[5], fstab[2]: mountpoint */
char *fstype; /* mountinfo[9], fstab[3]: filesystem type */
char *optstr; /* fstab[4], merged options */
char *vfs_optstr; /* mountinfo[6]: fs-independent (VFS) options */
char *opt_fields; /* mountinfo[7]: optional fields */
char *fs_optstr; /* mountinfo[11]: fs-dependent options */
char *user_optstr; /* userspace mount options */
char *attrs; /* mount attributes */
int freq; /* fstab[5]: dump frequency in days */
int passno; /* fstab[6]: pass number on parallel fsck */
/* /proc/swaps */
char *swaptype; /* swaps[2]: device type (partition, file, ...) */
off_t size; /* swaps[3]: swaparea size */
off_t usedsize; /* swaps[4]: used size */
int priority; /* swaps[5]: swap priority */
int flags; /* MNT_FS_* flags */
pid_t tid; /* /proc/<tid>/mountinfo otherwise zero */
char *comment; /* fstab comment */
void *userdata; /* library independent data */
};
/*
* fs flags
*/
#define MNT_FS_PSEUDO (1 << 1) /* pseudo filesystem */
#define MNT_FS_NET (1 << 2) /* network filesystem */
#define MNT_FS_SWAP (1 << 3) /* swap device */
#define MNT_FS_KERNEL (1 << 4) /* data from /proc/{mounts,self/mountinfo} */
#define MNT_FS_MERGED (1 << 5) /* already merged data from /run/mount/utab */
#define mnt_fs_is_regular(_f) (!(mnt_fs_is_pseudofs(_f) \
|| mnt_fs_is_netfs(_f) \
|| mnt_fs_is_swaparea(_f)))
/*
* mtab/fstab/mountinfo file
*/
struct libmnt_table {
int fmt; /* MNT_FMT_* file format */
int nents; /* number of entries */
int refcount; /* reference counter */
int comms; /* enable/disable comment parsing */
char *comm_intro; /* First comment in file */
char *comm_tail; /* Last comment in file */
struct libmnt_cache *cache; /* canonicalized paths/tags cache */
int (*errcb)(struct libmnt_table *tb,
const char *filename, int line);
int (*fltrcb)(struct libmnt_fs *fs, void *data);
void *fltrcb_data;
struct list_head ents; /* list of entries (libmnt_fs) */
void *userdata;
};
extern struct libmnt_table *__mnt_new_table_from_file(const char *filename, int fmt, int empty_for_enoent);
/*
* Tab file format
*/
enum {
MNT_FMT_GUESS,
MNT_FMT_FSTAB, /* /etc/{fs,m}tab */
MNT_FMT_MTAB = MNT_FMT_FSTAB, /* alias */
MNT_FMT_MOUNTINFO, /* /proc/#/mountinfo */
MNT_FMT_UTAB, /* /run/mount/utab */
MNT_FMT_SWAPS /* /proc/swaps */
};
/*
* Additional mounts
*/
struct libmnt_addmount {
unsigned long mountflags;
struct list_head mounts;
};
struct libmnt_ns {
int fd; /* file descriptor of namespace, -1 when inactive */
struct libmnt_cache *cache; /* paths cache associated with NS */
};
/*
* Mount context -- high-level API
*/
struct libmnt_context
{
int action; /* MNT_ACT_{MOUNT,UMOUNT} */
int restricted; /* root or not? */
char *fstype_pattern; /* for mnt_match_fstype() */
char *optstr_pattern; /* for mnt_match_options() */
struct libmnt_fs *fs; /* filesystem description (type, mountpoint, device, ...) */
struct libmnt_table *fstab; /* fstab (or mtab for some remounts) entries */
struct libmnt_table *mtab; /* mtab entries */
struct libmnt_table *utab; /* rarely used by umount only */
int (*table_errcb)(struct libmnt_table *tb, /* callback for libmnt_table structs */
const char *filename, int line);
int (*table_fltrcb)(struct libmnt_fs *fs, void *data); /* callback for libmnt_table structs */
void *table_fltrcb_data;
char *(*pwd_get_cb)(struct libmnt_context *); /* get encryption password */
void (*pwd_release_cb)(struct libmnt_context *, char *); /* release password */
int optsmode; /* fstab optstr mode MNT_OPTSMODE_{AUTO,FORCE,IGNORE} */
int loopdev_fd; /* open loopdev */
unsigned long mountflags; /* final mount(2) flags */
const void *mountdata; /* final mount(2) data, string or binary data */
unsigned long user_mountflags; /* MNT_MS_* (loop=, user=, ...) */
struct list_head addmounts; /* additional mounts */
struct libmnt_cache *cache; /* paths cache */
struct libmnt_lock *lock; /* mtab lock */
struct libmnt_update *update;/* mtab/utab update */
const char *mtab_path; /* path to mtab */
int mtab_writable; /* is mtab writable */
const char *utab_path; /* path to utab */
int utab_writable; /* is utab writable */
int flags; /* private context flags */
char *helper; /* name of the used /sbin/[u]mount.<type> helper */
int helper_status; /* helper wait(2) status */
int helper_exec_status; /* 1: not called yet, 0: success, <0: -errno */
char *orig_user; /* original (non-fixed) user= option */
pid_t *children; /* "mount -a --fork" PIDs */
int nchildren; /* number of children */
pid_t pid; /* 0=parent; PID=child */
int syscall_status; /* 1: not called yet, 0: success, <0: -errno */
struct libmnt_ns ns_orig; /* original namespace */
struct libmnt_ns ns_tgt; /* target namespace */
struct libmnt_ns *ns_cur; /* pointer to current namespace */
unsigned int enabled_textdomain : 1; /* bindtextdomain() called */
};
/* flags */
#define MNT_FL_NOMTAB (1 << 1)
#define MNT_FL_FAKE (1 << 2)
#define MNT_FL_SLOPPY (1 << 3)
#define MNT_FL_VERBOSE (1 << 4)
#define MNT_FL_NOHELPERS (1 << 5)
#define MNT_FL_LOOPDEL (1 << 6)
#define MNT_FL_LAZY (1 << 7)
#define MNT_FL_FORCE (1 << 8)
#define MNT_FL_NOCANONICALIZE (1 << 9)
#define MNT_FL_RDONLY_UMOUNT (1 << 11) /* remount,ro after EBUSY umount(2) */
#define MNT_FL_FORK (1 << 12)
#define MNT_FL_NOSWAPMATCH (1 << 13)
#define MNT_FL_RWONLY_MOUNT (1 << 14) /* explicit mount -w; never try read-only */
#define MNT_FL_MOUNTDATA (1 << 20)
#define MNT_FL_TAB_APPLIED (1 << 21) /* mtab/fstab merged to cxt->fs */
#define MNT_FL_MOUNTFLAGS_MERGED (1 << 22) /* MS_* flags was read from optstr */
#define MNT_FL_SAVED_USER (1 << 23)
#define MNT_FL_PREPARED (1 << 24)
#define MNT_FL_HELPER (1 << 25) /* [u]mount.<type> */
#define MNT_FL_LOOPDEV_READY (1 << 26) /* /dev/loop<N> initialized by the library */
#define MNT_FL_MOUNTOPTS_FIXED (1 << 27)
#define MNT_FL_TABPATHS_CHECKED (1 << 28)
#define MNT_FL_FORCED_RDONLY (1 << 29) /* mounted read-only on write-protected device */
/* default flags */
#define MNT_FL_DEFAULT 0
/* Flags usable with MS_BIND|MS_REMOUNT */
#define MNT_BIND_SETTABLE (MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_NOATIME|MS_NODIRATIME|MS_RELATIME|MS_RDONLY)
/* lock.c */
extern int mnt_lock_use_simplelock(struct libmnt_lock *ml, int enable);
/* optmap.c */
extern const struct libmnt_optmap *mnt_optmap_get_entry(
struct libmnt_optmap const **maps,
int nmaps,
const char *name,
size_t namelen,
const struct libmnt_optmap **mapent);
/* optstr.c */
extern int mnt_optstr_remove_option_at(char **optstr, char *begin, char *end);
extern int mnt_optstr_fix_gid(char **optstr, char *value, size_t valsz, char **next);
extern int mnt_optstr_fix_uid(char **optstr, char *value, size_t valsz, char **next);
extern int mnt_optstr_fix_secontext(char **optstr, char *value, size_t valsz, char **next);
extern int mnt_optstr_fix_user(char **optstr);
/* fs.c */
extern struct libmnt_fs *mnt_copy_mtab_fs(const struct libmnt_fs *fs)
__attribute__((nonnull));
extern int __mnt_fs_set_source_ptr(struct libmnt_fs *fs, char *source)
__attribute__((nonnull(1)));
extern int __mnt_fs_set_fstype_ptr(struct libmnt_fs *fs, char *fstype)
__attribute__((nonnull(1)));
/* context.c */
extern struct libmnt_context *mnt_copy_context(struct libmnt_context *o);
extern int mnt_context_mtab_writable(struct libmnt_context *cxt);
extern int mnt_context_utab_writable(struct libmnt_context *cxt);
extern const char *mnt_context_get_writable_tabpath(struct libmnt_context *cxt);
extern int mnt_context_get_mtab_for_target(struct libmnt_context *cxt,
struct libmnt_table **mtab, const char *tgt);
extern int mnt_context_prepare_srcpath(struct libmnt_context *cxt);
extern int mnt_context_prepare_target(struct libmnt_context *cxt);
extern int mnt_context_guess_srcpath_fstype(struct libmnt_context *cxt, char **type);
extern int mnt_context_guess_fstype(struct libmnt_context *cxt);
extern int mnt_context_prepare_helper(struct libmnt_context *cxt,
const char *name, const char *type);
extern int mnt_context_prepare_update(struct libmnt_context *cxt);
extern int mnt_context_merge_mflags(struct libmnt_context *cxt);
extern int mnt_context_update_tabs(struct libmnt_context *cxt);
extern int mnt_context_umount_setopt(struct libmnt_context *cxt, int c, char *arg);
extern int mnt_context_mount_setopt(struct libmnt_context *cxt, int c, char *arg);
extern int mnt_context_is_loopdev(struct libmnt_context *cxt)
__attribute__((nonnull));
extern int mnt_context_propagation_only(struct libmnt_context *cxt)
__attribute__((nonnull));
extern struct libmnt_addmount *mnt_new_addmount(void);
extern void mnt_free_addmount(struct libmnt_addmount *ad);
extern int mnt_context_setup_loopdev(struct libmnt_context *cxt);
extern int mnt_context_delete_loopdev(struct libmnt_context *cxt);
extern int mnt_context_clear_loopdev(struct libmnt_context *cxt);
extern int mnt_fork_context(struct libmnt_context *cxt);
extern int mnt_context_set_tabfilter(struct libmnt_context *cxt,
int (*fltr)(struct libmnt_fs *, void *),
void *data);
extern int mnt_context_get_generic_excode(int rc, char *buf, size_t bufsz, char *fmt, ...);
extern int mnt_context_get_mount_excode(struct libmnt_context *cxt, int mntrc, char *buf, size_t bufsz);
extern int mnt_context_get_umount_excode(struct libmnt_context *cxt, int mntrc, char *buf, size_t bufsz);
/* tab_update.c */
extern int mnt_update_set_filename(struct libmnt_update *upd,
const char *filename, int userspace_only);
extern int mnt_update_already_done(struct libmnt_update *upd,
struct libmnt_lock *lc);
#if __linux__
/* btrfs.c */
extern uint64_t btrfs_get_default_subvol_id(const char *path);
#endif
#endif /* _LIBMOUNT_PRIVATE_H */
