/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include <errno.h>
#include <libxfs.h>
#include <malloc.h>
#include "agheader.h"
#include "globals.h"
#include "protos.h"
#include "err_protos.h"
/*
* copy the fields of a superblock that are present in primary and
* secondaries -- preserve fields that are different in the primary.
*/
void
copy_sb(xfs_sb_t *source, xfs_sb_t *dest)
{
xfs_ino_t rootino;
xfs_ino_t rbmino;
xfs_ino_t rsumino;
xfs_ino_t uquotino;
xfs_ino_t pquotino;
__uint16_t versionnum;
rootino = dest->sb_rootino;
rbmino = dest->sb_rbmino;
rsumino = dest->sb_rsumino;
uquotino = dest->sb_uquotino;
pquotino = dest->sb_pquotino;
versionnum = dest->sb_versionnum;
*dest = *source;
dest->sb_rootino = rootino;
dest->sb_rbmino = rbmino;
dest->sb_rsumino = rsumino;
dest->sb_uquotino = uquotino;
dest->sb_pquotino = pquotino;
dest->sb_versionnum = versionnum;
/*
* copy over version bits that are stamped into all
* secondaries and cannot be changed at run time in
* the primary superblock
*/
if (XFS_SB_VERSION_HASDALIGN(source))
XFS_SB_VERSION_ADDDALIGN(dest);
if (XFS_SB_VERSION_HASEXTFLGBIT(source))
XFS_SB_VERSION_ADDEXTFLGBIT(dest);
/*
* these are all supposed to be zero or will get reset anyway
*/
dest->sb_icount = 0;
dest->sb_ifree = 0;
dest->sb_fdblocks = 0;
dest->sb_frextents = 0;
bzero(source->sb_fname, 12);
}
#define BSIZE (1024 * 1024)
/*
* find a secondary superblock, copy it into the sb buffer
*/
int
find_secondary_sb(xfs_sb_t *rsb)
{
xfs_off_t off;
xfs_sb_t *sb;
xfs_sb_t bufsb;
char *c_bufsb;
int done;
int i;
int dirty;
int retval;
int bsize;
do_warn("\nattempting to find secondary superblock...\n");
sb = (xfs_sb_t *) memalign(MEM_ALIGN, BSIZE);
if (!sb) {
do_error(
"error finding secondary superblock -- failed to memalign buffer\n");
exit(1);
}
bzero(&bufsb, sizeof(xfs_sb_t));
retval = 0;
dirty = 0;
bsize = 0;
/*
* skip first sector since we know that's bad
*/
for (done = 0, off = XFS_AG_MIN_BYTES; !done ; off += bsize) {
/*
* read disk 1 MByte at a time.
*/
if (lseek64(fs_fd, off, SEEK_SET) != off) {
done = 1;
}
if (!done && (bsize = read(fs_fd, sb, BSIZE)) == 0) {
done = 1;
}
do_warn(".");
/*
* check the buffer 512 bytes at a time since
* we don't know how big the sectors really are.
*/
for (i = 0; !done && i < bsize; i += BBSIZE) {
c_bufsb = (char *) sb + i;
libxfs_xlate_sb(c_bufsb, &bufsb, 1, ARCH_CONVERT,
XFS_SB_ALL_BITS);
if (verify_sb(&bufsb, 0) != XR_OK)
continue;
do_warn("found candidate secondary superblock...\n");
/*
* found one. now verify it by looking
* for other secondaries.
*/
bcopy(&bufsb, rsb, bufsb.sb_sectsize);
rsb->sb_inprogress = 0;
clear_sunit = 1;
if (verify_set_primary_sb(rsb, 0, &dirty) == XR_OK) {
do_warn("verified secondary superblock...\n");
done = 1;
retval = 1;
} else {
do_warn(
"unable to verify superblock, continuing...\n");
}
}
}
free(sb);
return(retval);
}
/*
* calculate what inode alignment field ought to be
* based on internal superblock info
*/
int
calc_ino_align(xfs_sb_t *sb)
{
xfs_extlen_t align;
align = XFS_INODE_BIG_CLUSTER_SIZE >> sb->sb_blocklog;
return(align);
}
/*
* verify a superblock -- does not verify root inode #
* can only check that geometry info is internally
* consistent. because of growfs, that's no guarantee
* of correctness (e.g. geometry may have changed)
*
* fields verified or consistency checked:
*
* sb_magicnum
*
* sb_versionnum
*
* sb_inprogress
*
* sb_blocksize (as a group)
* sb_blocklog
*
* geometry info - sb_dblocks (as a group)
* sb_agcount
* sb_agblocks
* sb_agblklog
*
* inode info - sb_inodesize (x-checked with geo info)
* sb_inopblock
*
* sector size info -
* sb_sectsize
* sb_sectlog
*
* not checked here -
* sb_rootino
* sb_fname
* sb_fpack
* sb_logstart
* sb_uuid
*
* ALL real-time fields
* final 4 summary counters
*/
int
verify_sb(xfs_sb_t *sb, int is_primary_sb)
{
__uint32_t bsize;
xfs_extlen_t align;
int i;
/* check magic number and version number */
if (sb->sb_magicnum != XFS_SB_MAGIC)
return(XR_BAD_MAGIC);
if (!XFS_SB_GOOD_VERSION(sb))
return(XR_BAD_VERSION);
/* does sb think mkfs really finished ? */
if (is_primary_sb && sb->sb_inprogress == 1)
return(XR_BAD_INPROGRESS);
/* check to make sure blocksize is legal 2^N, 9 <= N <= 16 */
if (sb->sb_blocksize == 0)
return(XR_BAD_BLOCKSIZE);
bsize = 1;
for (i = 0; bsize < sb->sb_blocksize && i < 32; i++) {
bsize <<= 1;
}
if (i < XR_LOG2BSIZE_MIN || i > XR_LOG2BSIZE_MAX)
return(XR_BAD_BLOCKSIZE);
/* check sb blocksize field against sb blocklog field */
if (i != sb->sb_blocklog)
return(XR_BAD_BLOCKLOG);
/* sanity check ag count, size fields against data size field */
if (sb->sb_dblocks == 0 ||
sb->sb_dblocks > sb->sb_agcount * sb->sb_agblocks ||
sb->sb_dblocks < (sb->sb_agcount - 1)
* sb->sb_agblocks + XFS_MIN_AG_BLOCKS)
return(XR_BAD_FS_SIZE_DATA);
if (sb->sb_agblklog != (__uint8_t)libxfs_log2_roundup(sb->sb_agblocks))
return(XR_BAD_FS_SIZE_DATA);
if (sb->sb_inodesize < XFS_DINODE_MIN_SIZE ||
sb->sb_inodesize > XFS_DINODE_MAX_SIZE ||
sb->sb_inopblock != howmany(sb->sb_blocksize,sb->sb_inodesize))
return(XR_BAD_INO_SIZE_DATA);
/* check sector size against log(sector size) field */
bsize = 1;
for (i = 0; bsize < sb->sb_sectsize && i < 15; i++) {
bsize <<= 1;
}
if (sb->sb_sectsize == 0 || i == 16 ||
sb->sb_sectsize != (1 << i))
return(XR_BAD_SECT_SIZE_DATA);
/*
* real-time extent size is always set
*/
if (sb->sb_rextsize * sb->sb_blocksize > XFS_MAX_RTEXTSIZE)
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_rextsize * sb->sb_blocksize < XFS_MIN_RTEXTSIZE)
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_rblocks == 0) {
if (sb->sb_rextents != 0)
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_rbmblocks != 0)
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_rextslog != 0)
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_frextents != 0)
return(XR_BAD_RT_GEO_DATA);
} else {
/*
* if we have a real-time partition, sanity-check geometry
*/
if (sb->sb_rblocks / sb->sb_rextsize != sb->sb_rextents)
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_rextslog !=
libxfs_highbit32((unsigned int)sb->sb_rextents))
return(XR_BAD_RT_GEO_DATA);
if (sb->sb_rbmblocks != (xfs_extlen_t) howmany(sb->sb_rextents,
NBBY * sb->sb_blocksize))
return(XR_BAD_RT_GEO_DATA);
}
/*
* verify correctness of inode alignment if it's there
*/
if (XFS_SB_VERSION_HASALIGN(sb)) {
align = calc_ino_align(sb);
if (align != sb->sb_inoalignmt)
return(XR_BAD_INO_ALIGN);
}
/*
* verify max. % of inodes (sb_imax_pct)
*/
if (sb->sb_imax_pct > 100)
return(XR_BAD_INO_MAX_PCT);
/*
* verify stripe alignment fields if present
*/
if (XFS_SB_VERSION_HASDALIGN(sb)) {
if ((!sb->sb_unit && sb->sb_width) ||
(sb->sb_unit && sb->sb_agblocks % sb->sb_unit))
return(XR_BAD_SB_UNIT);
if ((sb->sb_unit && !sb->sb_width) ||
(sb->sb_width && sb->sb_unit && sb->sb_width % sb->sb_unit))
return(XR_BAD_SB_WIDTH);
}
/*
* if shared bit is set, verify that the version number is sane
*/
if (XFS_SB_VERSION_HASSHARED(sb)) {
if (sb->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
return(XR_BAD_SVN);
}
/*
* mkfs's that stamped a feature bit besides the ones in the
* mask below could leave garbage in the secondary superblock
* sectors. Anything stamping the shared fs bit or better into
* the secondaries is ok and should generate clean secondary
* superblock sectors.
*
* check primary and clean secondary superblocks more strictly
*/
if (is_primary_sb || sb->sb_versionnum & XR_PART_SECSB_VNMASK) {
/*
* return errors if shared vn or alignment fields
* are set without their feature bits being set
*/
if (!pre_65_beta && sb->sb_versionnum & XR_PART_SECSB_VNMASK ||
pre_65_beta && sb->sb_versionnum & XR_ALPHA_SECSB_VNMASK) {
/*
* shared version # and inode alignment fields
* should be valid
*/
if (sb->sb_shared_vn && !XFS_SB_VERSION_HASSHARED(sb))
return(XR_BAD_SVN);
if (sb->sb_inoalignmt && !XFS_SB_VERSION_HASALIGN(sb))
return(XR_BAD_INO_ALIGN);
}
if ((!pre_65_beta &&
(sb->sb_versionnum & XR_GOOD_SECSB_VNMASK)) ||
(pre_65_beta &&
(sb->sb_versionnum & XFS_SB_VERSION_DALIGNBIT))) {
/*
* stripe alignment values should be valid
*/
if (sb->sb_unit && !XFS_SB_VERSION_HASDALIGN(sb))
return(XR_BAD_SB_UNIT);
if (sb->sb_width && !XFS_SB_VERSION_HASDALIGN(sb))
return(XR_BAD_SB_WIDTH);
}
#if 0
/*
* checks involving later superblock fields get added here...
*/
if (sb->sb_versionnum & XR_GOOD_SECSB_VNMASK) {
}
#endif
}
return(XR_OK);
}
void
write_primary_sb(xfs_sb_t *sbp, int size)
{
void *buf;
if (no_modify)
return;
if ((buf = calloc(size, 1)) == NULL) {
do_error("failed to malloc superblock buffer\n");
return;
}
if (lseek64(fs_fd, 0LL, SEEK_SET) != 0LL) {
free(buf);
do_error("couldn't seek to offset 0 in filesystem\n");
}
libxfs_xlate_sb(buf, sbp, -1, ARCH_CONVERT, XFS_SB_ALL_BITS);
if (write(fs_fd, buf, size) != size) {
free(buf);
do_error("primary superblock write failed!\n");
}
free(buf);
}
/*
* get a possible superblock -- don't check for internal consistency
*/
int
get_sb(xfs_sb_t *sbp, xfs_off_t off, int size, xfs_agnumber_t agno)
{
int error, rval;
void *buf;
if ((buf = calloc(size, 1)) == NULL) {
do_error(
"error reading superblock %u -- failed to malloc buffer\n",
agno, off);
exit(1);
}
/* try and read it first */
if (lseek64(fs_fd, off, SEEK_SET) != off) {
do_warn(
"error reading superblock %u -- seek to offset %lld failed\n",
agno, off);
return(XR_EOF);
}
if ((rval = read(fs_fd, buf, size)) != size) {
error = errno;
do_warn(
"superblock read failed, offset %lld, size %d, ag %u, rval %d\n",
off, size, rval, agno);
do_error("%s\n", strerror(error));
}
libxfs_xlate_sb(buf, sbp, 1, ARCH_CONVERT, XFS_SB_ALL_BITS);
free(buf);
return (verify_sb(sbp, 0));
}
#if 0
int
check_growfs(xfs_off_t off, int bufnum, xfs_agnumber_t agnum)
{
int rval;
ASSERT(bufnum < NUM_SBS);
/* try and read it first */
if (lseek64(fs_fd, off, SEEK_SET) != off)
return(XR_EOF);
if ((rval = read(fs_fd, sb_bufs[bufnum], sbbuf_size)) != sbbuf_size) {
/*
* we didn't get a full block so the filesystem
* could not have been grown. return a non-XR_OK
* result code.
*/
return(XR_EOF);
}
return(get_sb(off, bufnum, agnum));
}
#endif
/* returns element on list with highest reference count */
fs_geo_list_t *
get_best_geo(fs_geo_list_t *list)
{
int cnt = 0;
fs_geo_list_t *current, *rval = NULL;
current = list;
while (current != NULL) {
if (current->refs > cnt) {
rval = current;
cnt = current->refs;
}
current = current->next;
}
return(rval);
}
/* adds geometry info to linked list. returns (sometimes new) head of list */
fs_geo_list_t *
add_geo(fs_geo_list_t *list, fs_geometry_t *geo_p, int index)
{
fs_geo_list_t *current = list;
while (current != NULL) {
if (memcmp(geo_p, ¤t->geo, sizeof(fs_geometry_t)) == 0) {
current->refs++;
return(list);
}
current = current->next;
}
if ((current = malloc(sizeof(fs_geo_list_t))) == NULL) {
do_error("couldn't malloc geometry structure\n");
exit(1);
}
current->geo = *geo_p;
current->refs = 1;
current->next = list;
current->index = index;
return(current);
}
void
free_geo(fs_geo_list_t *list)
{
fs_geo_list_t *next;
fs_geo_list_t *current;
current = list;
for (current = list; current != NULL; current = next) {
next = current->next;
free(current);
}
}
void
get_sb_geometry(fs_geometry_t *geo, xfs_sb_t *sbp)
{
bzero(geo, sizeof(fs_geometry_t));
/*
* blindly set fields that we know are always good
*/
geo->sb_blocksize = sbp->sb_blocksize;
geo->sb_dblocks = sbp->sb_dblocks;
geo->sb_rblocks = sbp->sb_rblocks;
geo->sb_rextents = sbp->sb_rextents;
geo->sb_logstart = sbp->sb_logstart;
geo->sb_rextsize = sbp->sb_rextsize;
geo->sb_agblocks = sbp->sb_agblocks;
geo->sb_agcount = sbp->sb_agcount;
geo->sb_rbmblocks = sbp->sb_rbmblocks;
geo->sb_logblocks = sbp->sb_logblocks;
geo->sb_sectsize = sbp->sb_sectsize;
geo->sb_inodesize = sbp->sb_inodesize;
if (XFS_SB_VERSION_HASALIGN(sbp))
geo->sb_ialignbit = 1;
if (XFS_SB_VERSION_HASSHARED(sbp) ||
sbp->sb_versionnum & XR_PART_SECSB_VNMASK)
geo->sb_sharedbit = 1;
if (XFS_SB_VERSION_HASDALIGN(sbp))
geo->sb_salignbit = 1;
if (XFS_SB_VERSION_HASEXTFLGBIT(sbp))
geo->sb_extflgbit = 1;
/*
* protect against pre-6.5 mkfs-generated garbaged
* fields in the secondary superblocks. pay attention
* to those fields if and only if their corresponding
* feature bits are set in the feature bits of the
* version number or we can deduce from the version bits
* that are set that our field was properly initialized
* because a field after the field we care about was
* properly initialized as well.
*/
/*
* inode alignment field lives before the data alignment field
*/
if (!pre_65_beta && sbp->sb_versionnum & XR_PART_SECSB_VNMASK ||
pre_65_beta && sbp->sb_versionnum & XR_ALPHA_SECSB_VNMASK)
geo->sb_inoalignmt = sbp->sb_inoalignmt;
if (!pre_65_beta && sbp->sb_versionnum & XR_GOOD_SECSB_VNMASK ||
pre_65_beta && XFS_SB_VERSION_HASDALIGN(sbp)) {
geo->sb_unit = sbp->sb_unit;
geo->sb_width = sbp->sb_width;
}
/*
* shared vn always set if either ino or data alignment is on
* since that field lives between the quota and inode alignment
* fields
*/
if (sbp->sb_versionnum & XR_PART_SECSB_VNMASK)
geo->sb_shared_vn = sbp->sb_shared_vn;
/*
* superblock fields located after sb_widthfields get set
* into the geometry structure only if we can determine
* from the features enabled in this superblock whether
* or not the sector was bzero'd at mkfs time.
*/
if (!pre_65_beta && sbp->sb_versionnum & XR_GOOD_SECSB_VNMASK ||
pre_65_beta && sbp->sb_versionnum & XR_ALPHA_SECSB_VNMASK) {
geo->sb_fully_zeroed = 1;
}
}
/*
* the way to verify that a primary sb is consistent with the
* filesystem is find the secondaries given the info in the
* primary and compare the geometries in the secondaries against
* the geometry indicated by the primary.
*
* returns 1 if bad, 0 if ok
*/
int
verify_set_primary_sb(xfs_sb_t *rsb,
int sb_index,
int *sb_modified)
{
xfs_off_t off;
fs_geometry_t geo;
xfs_sb_t *sb;
fs_geo_list_t *list;
fs_geo_list_t *current;
char *checked;
xfs_agnumber_t agno;
int num_sbs;
int skip;
int size;
int num_ok;
int retval;
int round;
/*
* select the number of secondaries to try for
*/
num_sbs = MIN(NUM_SBS, rsb->sb_agcount);
skip = howmany(num_sbs, rsb->sb_agcount);
size = NUM_AGH_SECTS * rsb->sb_sectsize;
retval = 0;
list = NULL;
num_ok = 0;
*sb_modified = 0;
sb = (xfs_sb_t *) alloc_ag_buf(size);
checked = calloc(rsb->sb_agcount, sizeof(char));
if (!checked) {
do_error("calloc failed in verify_set_primary_sb\n");
exit(1);
}
/*
* put the primary sb geometry info onto the geometry list
*/
checked[sb_index] = 1;
get_sb_geometry(&geo, rsb);
list = add_geo(list, &geo, sb_index);
/*
* grab N secondaries. check them off as we get them
* so we only process each one once
*/
for (round = 0; round < skip; round++) {
for (agno = round; agno < rsb->sb_agcount; agno += skip) {
if (checked[agno])
continue;
off = (xfs_off_t)agno * rsb->sb_agblocks << rsb->sb_blocklog;
checked[agno] = 1;
if (get_sb(sb, off, size, agno) == XR_EOF) {
retval = 1;
goto out;
}
if (verify_sb(sb, 0) == XR_OK) {
/*
* save away geometry info.
* don't bother checking the sb
* against the agi/agf as the odds
* of the sb being corrupted in a way
* that it is internally consistent
* but not consistent with the rest
* of the filesystem is really really low.
*/
get_sb_geometry(&geo, sb);
list = add_geo(list, &geo, agno);
num_ok++;
}
}
}
/*
* see if we have enough superblocks to bother with
*/
if (num_ok < num_sbs / 2)
return(XR_INSUFF_SEC_SB);
current = get_best_geo(list);
/*
* check that enough sbs agree that we're willing to
* go with this geometry. if not, print out the
* geometry and a message about the force option.
*/
switch (num_sbs) {
case 2:
/*
* all them have to be right. if not, report geometry
* and get out unless force option is in effect (-F)
*/
if (current->refs != 2) {
if (!force_geo) {
do_warn("Only two AGs detected and they do not match - cannot proceed.\n");
exit(1);
}
}
break;
case 1:
/*
* just report the geometry info and get out.
* refuse to run further unless the force (-F)
* option is in effect.
*/
if (!force_geo) {
do_warn("Only one AG detected - cannot proceed.\n");
exit(1);
}
default:
/*
* at least half of the probed superblocks have
* to agree. if they don't, this fs is probably
* too far gone anyway considering the fact that
* XFS normally doesn't alter the secondary superblocks.
*/
if (current->refs < num_sbs / 2) {
do_warn("Not enough matching superblocks - cannot proceed.\n");
exit(1);
}
}
/*
* set the geometry into primary superblock if necessary.
*/
if (current->index != sb_index) {
*sb_modified = 1;
off = current->index * current->geo.sb_agblocks
* current->geo.sb_blocksize;
if (get_sb(sb, off, current->geo.sb_sectsize,
current->index) != XR_OK)
do_error("could not read superblock\n");
copy_sb(sb, rsb);
/*
* turn off inprogress bit since this is the primary.
* also save away values that we need to ensure are
* consistent in the other secondaries.
*/
rsb->sb_inprogress = 0;
sb_inoalignmt = sb->sb_inoalignmt;
sb_unit = sb->sb_unit;
sb_width = sb->sb_width;
}
free_geo(list);
out:
free(sb);
free(checked);
return(retval);
}
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