2N/A * GRUB -- GRand Unified Bootloader 2N/A * Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011 Free Software Foundation, Inc. 2N/A * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved. 2N/A * GRUB is free software: you can redistribute it and/or modify 2N/A * it under the terms of the GNU General Public License as published by 2N/A * the Free Software Foundation, either version 3 of the License, or 2N/A * (at your option) any later version. 2N/A * GRUB is distributed in the hope that it will be useful, 2N/A * but WITHOUT ANY WARRANTY; without even the implied warranty of 2N/A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 2N/A * GNU General Public License for more details. 2N/A * You should have received a copy of the GNU General Public License 2N/A else if (p[
1] ==
'\0')
2N/A/* Statting something on a btrfs filesystem always returns a virtual device 2N/A major/minor pair rather than the real underlying device, because btrfs 2N/A can span multiple underlying devices (and even if it's currently only 2N/A using a single device it can be dynamically extended onto another). We 2N/A can't deal with the multiple-device case yet, but in the meantime, we can 2N/A at least cope with the single-device case by scanning 2N/A return NULL;
/* fall through to other methods */ 2N/A /* First, build a list of relevant visible mounts. */ 2N/A /* Check that enc_path is a prefix of dir. The prefix must either be 2N/A the entire string, or end with a slash, or be immediately followed 2N/A /* Using the mount IDs, find out where this fits in the list of 2N/A visible mount entries we've seen so far. There are three 2N/A interesting cases. Firstly, it may be inserted at the end: this is 2N/A the usual case of /foo/bar being mounted after /foo. Secondly, it 2N/A may be inserted at the start: for example, this can happen for 2N/A filesystems that are mounted before / and later moved under it. 2N/A Thirdly, it may occlude part or all of the existing filesystem 2N/A tree, in which case the end of the list needs to be pruned and this 2N/A new entry will be inserted at the end. */ 2N/A /* Initialise list. */ 2N/A /* Insert at end, pruning anything previously above this. */ 2N/A /* Insert at start. */ 2N/A /* Now scan visible mounts for the ones we're interested in. */ 2N/A /* To find the minor name, we need to skip the instance # */ 2N/A#
endif /* __linux__ */ 2N/A /* get the root vdev */ 2N/A - dotfiles (like "/dev/.tmp.md0") since they could be duplicates. 2N/A - dotdirs (like "/dev/.static") since they could contain duplicates. */ 2N/A /* Ignore any error. */ 2N/A /* Follow symbolic links under /dev/mapper/; the canonical name 2N/A may be something like /dev/dm-0, but the names under 2N/A /dev/mapper/ are more human-readable and so we prefer them if 2N/A#
endif /* __linux__ */ 2N/A /* Don't follow other symbolic links. */ 2N/A /* Find it recursively. */ 2N/A /* Skip device names like /dev/dm-0, which are short-hand aliases 2N/A to more descriptive device names, e.g. those under /dev/mapper */ 2N/A /* Convert this block device to its character (raw) device. */ 2N/A /* Keep the device name as it is. */ 2N/A /* /dev/root is not a real block device keep looking, takes care 2N/A of situation where root filesystem is on the same partition as 2N/A return 0 on read error, ~0 on unknown serial. */ 2N/A /* Read boot sector. */ 2N/A /* Check signature. */ 2N/A if (!(
buf[
0x1fe] ==
0x55 &&
buf[
0x1ff] ==
0xaa))
2N/A /* Serial number offset depends on boot sector type. */ 2N/A /* No root device for /cygdrive. */ 2N/A /* Convert to full POSIX and Win32 path. */ 2N/A /* If identical, this is no real filesystem path. */ 2N/A /* Check for floppy drive letter. */ 2N/A /* Cygwin returns the partition serial number in stat.st_dev. 2N/A This is never identical to the device number of the emulated 2N/A /dev/sdXN device, so above grub_find_device () does not work. 2N/A Search the partition with the same serial in boot sector instead. */ 2N/A for (d =
'a'; d <=
'z'; d++)
2N/A for (p =
1; p <=
15; p++)
2N/A#
endif /* __CYGWIN__ */ 2N/A#
endif /* __linux__ */ 2N/A /* Cygwin specific function. */ 2N/A /* This might be truly slow, but is there any better way? */ 2N/A#
endif /* __CYGWIN__ */ 2N/A#
endif /* !__GNU__ */ 2N/A /* User explicitly claims that this drive is visible by BIOS. */ 2N/A /* Check for LVM and LUKS. */ 2N/A /* Check for RAID. */ 2N/A /* Check for LVM. */ 2N/A /* No abstraction found. */ 2N/A /* execvp has inconvenient types, hence the casts. None of these 2N/A strings will actually be modified. */ 2N/A /* Parent. Read mdadm's output. */ 2N/A#
endif /* __linux__ */ 2N/A default:
/* GRUB_DEV_ABSTRACTION_NONE */ 2N/A uuid +
sizeof (
"CRYPT-LUKS1-") -
1);
2N/A /* mdraid 1.x with a free name. */ 2N/A#
endif /* __linux__ */ 2N/A default:
/* GRUB_DEV_ABSTRACTION_NONE */ 2N/A/* Convert POSIX path to Win32 path, 2N/A remove drive letter, replace backslashes. */ 2N/A#
endif /* HAVE_LIBZFS */ 2N/A/* ZFS has similar problems to those of btrfs (see above). */ 2N/A/* This function never prints trailing slashes (so that its output 2N/A can be appended a slash unconditionally). */ 2N/A /* For ZFS sub-pool filesystems, could be extended to others (btrfs?). */ 2N/A /* This loop sets offset to the number of chars of the root 2N/A directory we're inspecting. */ 2N/A /* This should never happen. */ 2N/A /* buf is another filesystem; we found it. */ 2N/A /* offset == 0 means path given is the mount point. 2N/A This works around special-casing of "/" in Un*x. This function never 2N/A prints trailing slashes (so that its output can be appended a slash 2N/A unconditionally). Each slash in is considered a preceding slash, and 2N/A therefore the root directory is an empty string. */ 2N/A /* offset == 1 means root directory. */ 2N/A /* Include leading slash. */ 2N/A /* Reached some mount point not below /cygdrive. 2N/A GRUB does not know Cygwin's emulated mounts, 2N/A convert to Win32 path. */ 2N/A /* Remove trailing slashes, return empty string if root directory. */