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mountlist: use /proc/self/mountinfo when available

Use libmount to propagate device IDs provided by Linux in
/proc/self/mountinfo.  This will give more accurate output when using df
in chroot'ed environments as the device IDs are not determined by stat()
which may be inaccurate within the chroot.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
This commit is contained in:
Andrew Borodin 2014-09-21 16:53:32 +04:00
parent 3edcc3fd77
commit 12fac096ed
2 changed files with 76 additions and 20 deletions
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13
m4.include/ls-mntd-fs.m4
View File

@ -152,6 +152,19 @@ if test $ac_cv_func_getmntent = yes; then
of mounted file systems, and that function takes a single argument.
(4.3BSD, SunOS, HP-UX, Dynix, Irix)])
AC_CHECK_FUNCS([hasmntopt])
# Check for libmount to support /proc/self/mountinfo on Linux
AC_CACHE_VAL([ac_cv_lib_libmount_mnt_table_parse_stream],
[AC_CHECK_LIB([mount], [mnt_new_table_from_file],
ac_cv_lib_mount_mnt_table_parse_stream=yes,
ac_cv_lib_mount_mnt_table_parse_stream=no)])
if test $ac_cv_lib_mount_mnt_table_parse_stream = yes; then
AC_DEFINE([MOUNTED_PROC_MOUNTINFO], [1],
[Define if want to use /proc/self/mountinfo on Linux.])
LIBS="-lmount $LIBS"
elif test -f /proc/self/mountinfo; then
AC_MSG_WARN([/proc/self/mountinfo present but libmount is missing.])
fi
fi
fi

83
src/filemanager/mountlist.c
View File

@ -157,6 +157,12 @@
#include <sys/mntent.h>
#endif
#ifdef MOUNTED_PROC_MOUNTINFO
/* Use /proc/self/mountinfo instead of /proc/self/mounts (/etc/mtab)
* on Linux, if available */
#include <libmount/libmount.h>
#endif
#ifndef HAVE_HASMNTOPT
#define hasmntopt(mnt, opt) ((char *) 0)
#endif
@ -653,32 +659,69 @@ read_file_system_list (int need_fs_type)
#ifdef MOUNTED_GETMNTENT1 /* GNU/Linux, 4.3BSD, SunOS, HP-UX, Dynix, Irix. */
{
struct mntent *mnt;
const char *table = MOUNTED;
FILE *fp;
#ifdef MOUNTED_PROC_MOUNTINFO
struct libmnt_table *fstable = NULL;
fp = setmntent (table, "r");
if (fp == NULL)
return NULL;
fstable = mnt_new_table_from_file ("/proc/self/mountinfo");
while ((mnt = getmntent (fp)))
if (fstable != NULL)
{
me = g_malloc (sizeof (*me));
me->me_devname = g_strdup (mnt->mnt_fsname);
me->me_mountdir = g_strdup (mnt->mnt_dir);
me->me_type = g_strdup (mnt->mnt_type);
me->me_type_malloced = 1;
me->me_dummy = ME_DUMMY (me->me_devname, me->me_type, mnt);
me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
me->me_dev = dev_from_mount_options (mnt->mnt_opts);
struct libmnt_fs *fs;
struct libmnt_iter *iter;
iter = mnt_new_iter (MNT_ITER_FORWARD);
while (iter && mnt_table_next_fs (fstable, iter, &fs) == 0)
{
me = g_malloc (sizeof *me);
me->me_devname = g_strdup (mnt_fs_get_source (fs));
me->me_mountdir = g_strdup (mnt_fs_get_target (fs));
me->me_type = g_strdup (mnt_fs_get_fstype (fs));
me->me_type_malloced = 1;
me->me_dev = mnt_fs_get_devno (fs);
me->me_dummy = mnt_fs_is_pseudofs (fs);
me->me_remote = mnt_fs_is_netfs (fs);
/* Add to the linked list. */
*mtail = me;
mtail = &me->me_next;
}
mnt_free_iter (iter);
mnt_free_table (fstable);
/* Add to the linked list. */
*mtail = me;
mtail = &me->me_next;
}
else /* fallback to /proc/self/mounts (/etc/mtab) if anything failed */
#endif /* MOUNTED_PROC_MOUNTINFO */
{
FILE *fp;
struct mntent *mnt;
const char *table = MOUNTED;
if (endmntent (fp) == 0)
goto free_then_fail;
fp = setmntent (table, "r");
if (fp == NULL)
return NULL;
while ((mnt = getmntent (fp)))
{
me = g_malloc (sizeof (*me));
me->me_devname = g_strdup (mnt->mnt_fsname);
me->me_mountdir = g_strdup (mnt->mnt_dir);
me->me_type = g_strdup (mnt->mnt_type);
me->me_type_malloced = 1;
me->me_dummy = ME_DUMMY (me->me_devname, me->me_type, mnt);
me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
me->me_dev = dev_from_mount_options (mnt->mnt_opts);
/* Add to the linked list. */
*mtail = me;
mtail = &me->me_next;
}
if (endmntent (fp) == 0)
goto free_then_fail;
}
}
#endif /* MOUNTED_GETMNTENT1. */