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Use a more straight-forward approach to relaxing the location

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restraints when validating one of the backup superblocks.
This commit is contained in:
Kirk McKusick 2018-02-26 00:34:56 +00:00
parent 16e39c48a3
commit 528833fae1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329997
1 changed files with 8 additions and 12 deletions
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20
sys/ufs/ffs/ffs_subr.c
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@ -140,7 +140,7 @@ ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino)
* the superblock and its associated data.
*/
static off_t sblock_try[] = SBLOCKSEARCH;
static int readsuper(void *, struct fs **, off_t,
static int readsuper(void *, struct fs **, off_t, int,
int (*)(void *, off_t, void **, int));
/*
@ -174,11 +174,12 @@ ffs_sbget(void *devfd, struct fs **fsp, off_t altsblock,
*fsp = NULL;
if (altsblock != -1) {
if ((error = readsuper(devfd, fsp, -altsblock, readfunc)) != 0)
if ((error = readsuper(devfd, fsp, altsblock, 1,
readfunc)) != 0)
return (error);
} else {
for (i = 0; sblock_try[i] != -1; i++) {
if ((error = readsuper(devfd, fsp, sblock_try[i],
if ((error = readsuper(devfd, fsp, sblock_try[i], 0,
readfunc)) == 0)
break;
if (error == ENOENT)
@ -238,17 +239,12 @@ ffs_sbget(void *devfd, struct fs **fsp, off_t altsblock,
* Return zero on success or an errno on failure.
*/
static int
readsuper(void *devfd, struct fs **fsp, off_t sblockloc,
readsuper(void *devfd, struct fs **fsp, off_t sblockloc, int isaltsblk,
int (*readfunc)(void *devfd, off_t loc, void **bufp, int size))
{
struct fs *fs;
int error, altblk;
int error;
altblk = 0;
if (sblockloc < 0) {
altblk = 1;
sblockloc = - sblockloc;
}
error = (*readfunc)(devfd, sblockloc, (void **)fsp, SBLOCKSIZE);
if (*fsp != NULL)
(*fsp)->fs_csp = NULL; /* Not yet any summary information */
@ -257,9 +253,9 @@ readsuper(void *devfd, struct fs **fsp, off_t sblockloc,
fs = *fsp;
if (fs->fs_magic == FS_BAD_MAGIC)
return (EINVAL);
if (((fs->fs_magic == FS_UFS1_MAGIC && (altblk ||
if (((fs->fs_magic == FS_UFS1_MAGIC && (isaltsblk ||
sblockloc <= SBLOCK_UFS1)) ||
(fs->fs_magic == FS_UFS2_MAGIC && (altblk ||
(fs->fs_magic == FS_UFS2_MAGIC && (isaltsblk ||
sblockloc == fs->fs_sblockloc))) &&
fs->fs_ncg >= 1 &&
fs->fs_bsize >= MINBSIZE &&