/* 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 * * 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 #include #include #include #include #include #include #include #include #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//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. 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. */ #define MNT_FL_LOOPDEV_READY (1 << 26) /* /dev/loop 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 */