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Diffstat (limited to 'libmount/src/mountP.h')
| -rw-r--r-- | libmount/src/mountP.h | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/libmount/src/mountP.h b/libmount/src/mountP.h new file mode 100644 index 0000000..8f4fba7 --- /dev/null +++ b/libmount/src/mountP.h @@ -0,0 +1,461 @@ +/* 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_guess_system_root(dev_t devno, struct libmnt_cache *cache, char **path); +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; + + 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 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 */ |