into ffs_sbsearch() to allow use by other parts of the system.
Historically only fsck_ffs(8), the UFS filesystem checker, had code
to track down and use alternate UFS superblocks. Since fsdb(8) used
much of the fsck_ffs(8) implementation it had some ability to track
down alternate superblocks.
This change extracts the code to track down alternate superblocks
from fsck_ffs(8) and puts it into a new function ffs_sbsearch() in
sys/ufs/ffs/ffs_subr.c. Like ffs_sbget() and ffs_sbput() also found
in ffs_subr.c, these functions can be used directly by the kernel
subsystems. Additionally they are exported to the UFS library,
libufs(8) so that they can be used by user-level programs. The new
functions added to libufs(8) are sbfind(3) that is an alternative
to sbread(3) and sbsearch(3) that is an alternative to sbget(3).
See their manual pages for further details.
The utilities that have been changed to search for superblocks are
dumpfs(8), fsdb(8), ffsinfo(8), and fsck_ffs(8). Also, the prtblknos(8)
tool found in tools/diag/prtblknos searches for superblocks.
The UFS specific mount code uses the superblock search interface
when mounting the root filesystem and when the administrator doing
a mount(8) command specifies the force flag (-f). The standalone UFS
boot code (found in stand/libsa/ufs.c) uses the superblock search
code in the hope of being able to get the system up and running so
that fsck_ffs(8) can be used to get the filesystem cleaned up.
The following utilities have not been changed to search for
superblocks: clri(8), tunefs(8), snapinfo(8), fstyp(8), quot(8),
dump(8), fsirand(8), growfs(8), quotacheck(8), gjournal(8), and
glabel(8). When these utilities fail, they do report the cause of
the failure. The one exception is the tasting code used to try and
figure what a given disk contains. The tasting code will remain
silent so as not to put out a slew of messages as it trying to taste
every new mass storage device that shows up.
Reviewed by: kib
Reviewed by: Warner Losh
Tested by: Peter Holm
Differential Revision: https://reviews.freebsd.org/D36053
Sponsored by: The FreeBSD Foundation
Shortlinks occupy the space of both di_db and di_ib when used. However,
everywhere that wants to read or write a shortlink takes a pointer do
di_db and promptly runs off the end of it into di_ib. This is fine on
most architectures, if a little dodgy. However, on CHERI, the compiler
can optionally restrict the bounds on pointers to subobjects to just
that subobject, in order to mitigate intra-object buffer overflows, and
this is enabled in CheriBSD's pure-capability kernels.
Instead, clean this up by inserting a union such that a new di_shortlink
can be added with the right size and element type, avoiding the need to
cast and allowing the use of the DIP macro to access the field. This
also mirrors how the ext2fs code implements extents support, with the
exact same structure other than having a uint32_t i_data[] instead of a
char di_shortlink[].
Reviewed by: mckusick, jhb
Differential Revision: https://reviews.freebsd.org/D33650
document the libufs interface for fetching and storing inodes.
The undocumented getino / putino interface has been replaced
with a new getinode / putinode interface.
Convert the utilities that had been using the undocumented
interface to use the new documented interface.
No functional change (as for now the libufs library does not
do inode check-hashes).
Reviewed by: kib
Tested by: Peter Holm
Sponsored by: Netflix
to fit in only direct blocks whose size is exactly a multiple of the
filesystem block size.
Reported by: Peter Holm
Tested by: Peter Holm
Sponsored by: Netflix
block followed by a discontiguous fragment.
Add checks for unallocated inodes and inodes with unknown mode
types.
Cleanup variable declarations by changing from type `int' to types
like ufs_lbn_t, ufs2_daddr_t, etc.
Reported by: bde
prtblknos filesystem_device inode ...
add an additional argument format:
prtblknos file
which is more convenient than figuring out the filesystem
and inode number for "file".
When given a list of multiple inodes, rather than exiting
the program on an error with one of them, skip over it and
continue with the next one.
Submitted by: bde
regular files, directories, and symbolic links that require
external storage.
Correct the handling of files with holes and files that have
one or more large blocks and end with a fragment.
Reported by: bde
main.c - opens disk and processes the argument list
of inodes to be printed
prtblknos.c - prints out the list of blocks used by an inode
This change allows the fsdb program to import prtblknos() to use when
printing out the set of blocks used by an inode.
This program was switched to using the libufs library to ease its
integration with fsdb and any other filesystem utility that might
want to use it in the future.
of blocks used by a requested list of inodes.
For example, to list the blocks referenced by your kernel:
guest_12 % df /
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/gpt/rootfs 20307196 10707336 7975288 57% /
guest_12 % ls -i /boot/kernel/kernel
160603 /boot/kernel/kernel
guest_12 % ./prtblknos /dev/gpt/rootfs 160603
160603: lbn 0-7 blkno 3217584-3217647
lbn 8-11 blkno 3217864-3217895 distance 216
First-level indirect, blkno 3217896-3217903 distance 0
lbn 12-19 blkno 3217904-3217967 distance 8
lbn 20-75 blkno 3251816-3252263 distance 33848
lbn 76-83 blkno 3252368-3252431 distance 104
lbn 84-91 blkno 3252464-3252527 distance 32
lbn 92-852 blkno 3252896-3258983 distance 368
Each contiguous range of blocks is printed on a line.
The distance metric is the size of the gap from the end of the
previous set of blocks to the beginning of the next set of blocks.
Short distances are desirable.
