/* * mountP.h - private library header file * * Copyright (C) 2008-2009 Karel Zak * * This file may be redistributed under the terms of the * GNU Lesser General Public License. */ #ifndef _LIBMOUNT_PRIVATE_H #define _LIBMOUNT_PRIVATE_H #include #include #include #include #include #include #include "c.h" #include "list.h" #include "libmount.h" /* features */ #define CONFIG_LIBMOUNT_ASSERT #define CONFIG_LIBMOUNT_DEBUG #ifdef CONFIG_LIBMOUNT_ASSERT #include #endif /* * Debug */ #if defined(TEST_PROGRAM) && !defined(LIBMOUNT_DEBUG) #define CONFIG_LIBMOUNT_DEBUG #endif #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_OPTS (1 << 7) #define MNT_DEBUG_UPDATE (1 << 8) #define MNT_DEBUG_UTILS (1 << 9) #define MNT_DEBUG_CXT (1 << 10) #define MNT_DEBUG_DIFF (1 << 11) #define MNT_DEBUG_ALL 0xFFFF #ifdef CONFIG_LIBMOUNT_DEBUG # include # include # define ON_DBG(m, x) do { \ if ((MNT_DEBUG_ ## m) & libmount_debug_mask) { \ x; \ } \ } while (0) # define DBG(m, x) do { \ if ((MNT_DEBUG_ ## m) & libmount_debug_mask) { \ fprintf(stderr, "%d: libmount: %8s: ", getpid(), # m); \ x; \ } \ } while (0) # define DBG_FLUSH do { \ if (libmount_debug_mask && \ libmount_debug_mask != MNT_DEBUG_INIT) \ fflush(stderr); \ } while(0) extern int libmount_debug_mask; static inline void __attribute__ ((__format__ (__printf__, 1, 2))) mnt_debug(const char *mesg, ...) { va_list ap; va_start(ap, mesg); vfprintf(stderr, mesg, ap); va_end(ap); fputc('\n', stderr); } static inline void __attribute__ ((__format__ (__printf__, 2, 3))) mnt_debug_h(void *handler, const char *mesg, ...) { va_list ap; fprintf(stderr, "[%p]: ", handler); va_start(ap, mesg); vfprintf(stderr, mesg, ap); va_end(ap); fputc('\n', stderr); } #else /* !CONFIG_LIBMOUNT_DEBUG */ # define ON_DBG(m,x) do { ; } while (0) # define DBG(m,x) do { ; } while (0) # define DBG_FLUSH do { ; } while(0) #endif /* 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 endswith(const char *s, const char *sx); extern int startswith(const char *s, const char *sx); extern int mnt_is_readonly(const char *path); 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 char *mnt_get_fs_root(const char *path, const char *mountpoint); 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); /* tab.c */ 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 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 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 *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 */ 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 valid entries */ struct libmnt_cache *cache; /* canonicalized paths/tags cache */ int (*errcb)(struct libmnt_table *tb, const char *filename, int line); struct list_head ents; /* list of entries (libmnt_fs) */ }; extern struct libmnt_table *__mnt_new_table_from_file(const char *filename, int fmt); /* * 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 */ }; /* * 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 */ int (*table_errcb)(struct libmnt_table *tb, /* callback for libmnt_table structs */ const char *filename, int line); 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 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 */ int ambi; /* libblkid returns ambivalent result */ 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 */ }; /* 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_EXTERN_FS (1 << 15) /* cxt->fs is not private */ #define MNT_FL_EXTERN_FSTAB (1 << 16) /* cxt->fstab is not private */ #define MNT_FL_EXTERN_CACHE (1 << 17) /* cxt->cache is not private */ #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 library */ #define MNT_FL_MOUNTOPTS_FIXED (1 << 27) /* default flags */ #define MNT_FL_DEFAULT 0 /* 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); extern int __mnt_fs_set_source_ptr(struct libmnt_fs *fs, char *source); extern int __mnt_fs_set_fstype_ptr(struct libmnt_fs *fs, char *fstype); /* context.c */ 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_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); 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); /* tab_update.c */ extern int mnt_update_set_filename(struct libmnt_update *upd, const char *filename, int userspace_only); #endif /* _LIBMOUNT_PRIVATE_H */