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freebsd-dev/lib/libufs/libufs.h

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lib: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
2017-11-26 02:00:33 +00:00
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
* Copyright (c) 2002 Juli Mallett. All rights reserved.
*
* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
* FreeBSD project. Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
Wrap the header to prevent multiple inclusion, and mark the DECLS section. Reminded by: Rachel Hestilow <hestilow@ximian.com>
2002-08-22 23:35:35 +00:00
#ifndef __LIBUFS_H__
#define __LIBUFS_H__
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* libufs structures.
*/
In preparation for adding inode check-hashes, clean up and 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
2018-11-13 21:40:56 +00:00
union dinodep {
struct ufs1_dinode *dp1;
struct ufs2_dinode *dp2;
};
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* userland ufs disk.
*/
struct uufsd {
Align comments in struct uufsd structure. No semantic change. Sponsored by: Netflix
2020-06-23 21:17:13 +00:00
const char *d_name; /* disk name */
int d_ufs; /* decimal UFS version */
int d_fd; /* raw device file descriptor */
long d_bsize; /* device bsize */
ufs2_daddr_t d_sblock; /* superblock location */
struct csum *d_sbcsum; /* Superblock summary info */
caddr_t d_inoblock; /* inode block */
uint32_t d_inomin; /* low ino, not ino_t for ABI compat */
uint32_t d_inomax; /* high ino, not ino_t for ABI compat */
union dinodep d_dp; /* pointer to currently active inode */
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
union {
Align comments in struct uufsd structure. No semantic change. Sponsored by: Netflix
2020-06-23 21:17:13 +00:00
struct fs d_fs; /* filesystem information */
char d_sb[MAXBSIZE]; /* superblock as buffer */
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
} d_sbunion;
Add facility to read one, or a string of, cylinger groups.
2003-01-19 01:31:26 +00:00
union {
Align comments in struct uufsd structure. No semantic change. Sponsored by: Netflix
2020-06-23 21:17:13 +00:00
struct cg d_cg; /* cylinder group */
char d_buf[MAXBSIZE]; /* cylinder group storage */
Add facility to read one, or a string of, cylinger groups.
2003-01-19 01:31:26 +00:00
} d_cgunion;
Align comments in struct uufsd structure. No semantic change. Sponsored by: Netflix
2020-06-23 21:17:13 +00:00
int d_ccg; /* current cylinder group */
int d_lcg; /* last cylinder group (in d_cg) */
const char *d_error; /* human readable disk error */
int d_mine; /* internal flags */
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
#define d_fs d_sbunion.d_fs
#define d_sb d_sbunion.d_sb
Add facility to read one, or a string of, cylinger groups.
2003-01-19 01:31:26 +00:00
#define d_cg d_cgunion.d_cg
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
};
Replace ERROR() macro with inline function. In-tree gcc cannot tolerate the construct like printf("%\s", NULL) resulting from macroexpand of ERROR(u, NULL), making it impossible to use LIBUFS_DEBUGGING. With inline function, compiler cannot detect the NULL argument to known function and does not try to convert it into puts(). In collaboration with: pho
2011-02-12 12:46:00 +00:00
/*
* libufs macros (internal, non-exported).
*/
#ifdef _LIBUFS
/*
* Trace steps through libufs, to be used at entry and erroneous return.
*/
static inline void
ERROR(struct uufsd *u, const char *str)
{
#ifdef _LIBUFS_DEBUGGING
if (str != NULL) {
fprintf(stderr, "libufs: %s", str);
if (errno != 0)
fprintf(stderr, ": %s", strerror(errno));
fprintf(stderr, "\n");
}
#endif
if (u != NULL)
u->d_error = str;
}
#endif /* _LIBUFS */
Wrap the header to prevent multiple inclusion, and mark the DECLS section. Reminded by: Rachel Hestilow <hestilow@ximian.com>
2002-08-22 23:35:35 +00:00
__BEGIN_DECLS
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* libufs prototypes.
*/
Refactoring of reading and writing of the UFS/FFS superblock. Specifically reading is done if ffs_sbget() and writing is done in ffs_sbput(). These functions are exported to libufs via the sbget() and sbput() functions which then used in the various filesystem utilities. This work is in preparation for adding subperblock check hashes. No functional change intended. Reviewed by: kib
2018-01-26 00:58:32 +00:00
/*
* ffs_subr.c
*/
void ffs_clrblock(struct fs *, u_char *, ufs1_daddr_t);
void ffs_clusteracct(struct fs *, struct cg *, ufs1_daddr_t, int);
void ffs_fragacct(struct fs *, int, int32_t [], int);
int ffs_isblock(struct fs *, u_char *, ufs1_daddr_t);
int ffs_isfreeblock(struct fs *, u_char *, ufs1_daddr_t);
void ffs_setblock(struct fs *, u_char *, ufs1_daddr_t);
int ffs_sbget(void *, struct fs **, off_t, char *,
int (*)(void *, off_t, void **, int));
int ffs_sbput(void *, struct fs *, off_t,
int (*)(void *, off_t, void *, int));
Continuing efforts to provide hardening of FFS. This change adds a check hash to the filesystem inodes. Access attempts to files associated with an inode with an invalid check hash will fail with EINVAL (Invalid argument). Access is reestablished after an fsck is run to find and validate the inodes with invalid check-hashes. This check avoids a class of filesystem panics related to corrupted inodes. The hash is done using crc32c. Note this check-hash is for the inode itself and not any of its indirect blocks. Check-hash validation may be extended to also cover indirect block pointers, but that will be a separate (and more costly) feature. Check hashes are added only to UFS2 and not to UFS1 as UFS1 is primarily used in embedded systems with small memories and low-powered processors which need as light-weight a filesystem as possible. Reviewed by: kib Tested by: Peter Holm Sponsored by: Netflix
2018-12-11 22:14:37 +00:00
void ffs_update_dinode_ckhash(struct fs *, struct ufs2_dinode *);
int ffs_verify_dinode_ckhash(struct fs *, struct ufs2_dinode *);
Refactoring of reading and writing of the UFS/FFS superblock. Specifically reading is done if ffs_sbget() and writing is done in ffs_sbput(). These functions are exported to libufs via the sbget() and sbput() functions which then used in the various filesystem utilities. This work is in preparation for adding subperblock check hashes. No functional change intended. Reviewed by: kib
2018-01-26 00:58:32 +00:00
Normally when an attempt is made to mount a UFS/FFS filesystem whose superblock has a check-hash error, an error message noting the superblock check-hash failure is printed and the mount fails. The administrator then runs fsck to repair the filesystem and when successful, the filesystem can once again be mounted. This approach fails if the filesystem in question is a root filesystem from which you are trying to boot. Here, the loader fails when trying to access the filesystem to get the kernel to boot. So it is necessary to allow the loader to ignore the superblock check-hash error and make a best effort to read the kernel. The filesystem may be suffiently corrupted that the read attempt fails, but there is no harm in trying since the loader makes no attempt to write to the filesystem. Once the kernel is loaded and starts to run, it attempts to mount its root filesystem. Once again, failure means that it breaks to its prompt to ask where to get its root filesystem. Unless you have an alternate root filesystem, you are stuck. Since the root filesystem is initially mounted read-only, it is safe to make an attempt to mount the root filesystem with the failed superblock check-hash. Thus, when asked to mount a root filesystem with a failed superblock check-hash, the kernel prints a warning message that the root filesystem superblock check-hash needs repair, but notes that it is ignoring the error and proceeding. It does mark the filesystem as needing an fsck which prevents it from being enabled for writing until fsck has been run on it. The net effect is that the reboot fails to single user, but at least at that point the administrator has the tools at hand to fix the problem. Reported by: Rick Macklem (rmacklem@) Discussed with: Warner Losh (imp@) Sponsored by: Netflix
2018-12-06 00:09:39 +00:00
/*
* Request standard superblock location in ffs_sbget
*/
#define STDSB -1 /* Fail if check-hash is bad */
#define STDSB_NOHASHFAIL -2 /* Ignore check-hash failure */
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* block.c
*/
ssize_t bread(struct uufsd *, ufs2_daddr_t, void *, size_t);
ssize_t bwrite(struct uufsd *, ufs2_daddr_t, const void *, size_t);
Add a berase() function which uses ioctl(DIOCGDELETE) to erase a slab of the disk.
2007-12-16 18:02:37 +00:00
int berase(struct uufsd *, ufs2_daddr_t, ufs2_daddr_t);
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
Add facility to read one, or a string of, cylinger groups.
2003-01-19 01:31:26 +00:00
/*
* cgroup.c
*/
- Merge soft-updates journaling from projects/suj/head into head. This brings in support for an optional intent log which eliminates the need for background fsck on unclean shutdown. Sponsored by: iXsystems, Yahoo!, and Juniper. With help from: McKusick and Peter Holm
2010-04-24 07:05:35 +00:00
ufs2_daddr_t cgballoc(struct uufsd *);
int cgbfree(struct uufsd *, ufs2_daddr_t, long);
ino_t cgialloc(struct uufsd *);
Correct fsck journal-recovery code to update a cylinder-group check-hash after making changes to the cylinder group. The problem was that the journal-recovery code was calling the libufs bwrite() function instead of the cgput() function. The cgput() function updates the cylinder-group check-hash before writing the cylinder group. This change required the additions of the cgget() and cgput() functions to the libufs API to avoid a gratuitous bcopy of every cylinder group to be read or written. These new functions have been added to the libufs manual pages. This was the first opportunity that I have had to use and document the use of the EDOOFUS error code. Reviewed by: kib Reported by: emaste and others
2018-01-17 17:58:24 +00:00
int cgget(struct uufsd *, int, struct cg *);
int cgput(struct uufsd *, struct cg *);
Add facility to read one, or a string of, cylinger groups.
2003-01-19 01:31:26 +00:00
int cgread(struct uufsd *);
int cgread1(struct uufsd *, int);
- Merge soft-updates journaling from projects/suj/head into head. This brings in support for an optional intent log which eliminates the need for background fsck on unclean shutdown. Sponsored by: iXsystems, Yahoo!, and Juniper. With help from: McKusick and Peter Holm
2010-04-24 07:05:35 +00:00
int cgwrite(struct uufsd *);
Implement cgwrite1(3) function which stored a given cylinder group on disk. Sponsored by: home.pl
2006-10-31 21:21:48 +00:00
int cgwrite1(struct uufsd *, int);
Add facility to read one, or a string of, cylinger groups.
2003-01-19 01:31:26 +00:00
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* inode.c
*/
In preparation for adding inode check-hashes, clean up and 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
2018-11-13 21:40:56 +00:00
int getinode(struct uufsd *, union dinodep *, ino_t);
int putinode(struct uufsd *);
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* sblock.c
*/
int sbread(struct uufsd *);
int sbwrite(struct uufsd *, int);
Refactoring of reading and writing of the UFS/FFS superblock. Specifically reading is done if ffs_sbget() and writing is done in ffs_sbput(). These functions are exported to libufs via the sbget() and sbput() functions which then used in the various filesystem utilities. This work is in preparation for adding subperblock check hashes. No functional change intended. Reviewed by: kib
2018-01-26 00:58:32 +00:00
/* low level superblock read/write functions */
int sbget(int, struct fs **, off_t);
int sbput(int, struct fs *, int);
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* type.c
*/
int ufs_disk_close(struct uufsd *);
int ufs_disk_fillout(struct uufsd *, const char *);
API to fillout a blank disk. For e.g. newfs.
2003-01-23 21:32:56 +00:00
int ufs_disk_fillout_blank(struct uufsd *, const char *);
API for opening (and tracking) writable file descriptors per disk.
2003-01-29 23:19:46 +00:00
int ufs_disk_write(struct uufsd *);
Wrap the header to prevent multiple inclusion, and mark the DECLS section. Reminded by: Rachel Hestilow <hestilow@ximian.com>
2002-08-22 23:35:35 +00:00
Continuing efforts to provide hardening of FFS, this change adds a check hash to cylinder groups. If a check hash fails when a cylinder group is read, no further allocations are attempted in that cylinder group until it has been fixed by fsck. This avoids a class of filesystem panics related to corrupted cylinder group maps. The hash is done using crc32c. Check hases are added only to UFS2 and not to UFS1 as UFS1 is primarily used in embedded systems with small memories and low-powered processors which need as light-weight a filesystem as possible. Specifics of the changes: sys/sys/buf.h: Add BX_FSPRIV to reserve a set of eight b_xflags that may be used by individual filesystems for their own purpose. Their specific definitions are found in the header files for each filesystem that uses them. Also add fields to struct buf as noted below. sys/kern/vfs_bio.c: It is only necessary to compute a check hash for a cylinder group when it is actually read from disk. When calling bread, you do not know whether the buffer was found in the cache or read. So a new flag (GB_CKHASH) and a pointer to a function to perform the hash has been added to breadn_flags to say that the function should be called to calculate a hash if the data has been read. The check hash is placed in b_ckhash and the B_CKHASH flag is set to indicate that a read was done and a check hash calculated. Though a rather elaborate mechanism, it should also work for check hashing other metadata in the future. A kernel internal API change was to change breada into a static fucntion and add flags and a function pointer to a check-hash function. sys/ufs/ffs/fs.h: Add flags for types of check hashes; stored in a new word in the superblock. Define corresponding BX_ flags for the different types of check hashes. Add a check hash word in the cylinder group. sys/ufs/ffs/ffs_alloc.c: In ffs_getcg do the dance with breadn_flags to get a check hash and if one is provided, check it. sys/ufs/ffs/ffs_vfsops.c: Copy across the BX_FFSTYPES flags in background writes. Update the check hash when writing out buffers that need them. sys/ufs/ffs/ffs_snapshot.c: Recompute check hash when updating snapshot cylinder groups. sys/libkern/crc32.c: lib/libufs/Makefile: lib/libufs/libufs.h: lib/libufs/cgroup.c: Include libkern/crc32.c in libufs and use it to compute check hashes when updating cylinder groups. Four utilities are affected: sbin/newfs/mkfs.c: Add the check hashes when building the cylinder groups. sbin/fsck_ffs/fsck.h: sbin/fsck_ffs/fsutil.c: Verify and update check hashes when checking and writing cylinder groups. sbin/fsck_ffs/pass5.c: Offer to add check hashes to existing filesystems. Precompute check hashes when rebuilding cylinder group (although this will be done when it is written in fsutil.c it is necessary to do it early before comparing with the old cylinder group) sbin/dumpfs/dumpfs.c Print out the new check hash flag(s) sbin/fsdb/Makefile: Needs to add libufs now used by pass5.c imported from fsck_ffs. Reviewed by: kib Tested by: Peter Holm (pho)
2017-09-22 12:45:15 +00:00
/*
* crc32c.c
*/
uint32_t calculate_crc32c(uint32_t, const void *, size_t);
Wrap the header to prevent multiple inclusion, and mark the DECLS section. Reminded by: Rachel Hestilow <hestilow@ximian.com>
2002-08-22 23:35:35 +00:00
__END_DECLS
#endif /* __LIBUFS_H__ */
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