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ufs/ffs: detect endian mismatch between machine and filesystem
Mount on a LE machine a filesystem formatted for BE is not supported currently. This adds a check for the superblock magic number using swapped bytes to guess and warn the user that it may be a valid superblock but endian is incompatible. MFC after: 2 weeks Reviewed by: mckusick Obtained from: mckusick, alfredo Differential Revision: https://reviews.freebsd.org/D37675
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@ -794,7 +794,7 @@ parse_mount(char **conf)
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ma = parse_mountroot_options(ma, opts);
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error = kernel_mount(ma, MNT_ROOTFS);
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if (error == 0 || timeout <= 0)
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if (error == 0 || error == EILSEQ || timeout <= 0)
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break;
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if (root_mount_timeout * hz == timeout ||
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@ -35,6 +35,7 @@
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <sys/limits.h>
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#ifndef _KERNEL
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@ -144,6 +145,7 @@ static int validate_sblock(struct fs *, int);
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* EIO: non-existent or truncated superblock.
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* EIO: error reading summary information.
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* ENOENT: no usable known superblock found.
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* EILSEQ: filesystem with wrong byte order found.
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* ENOMEM: failed to allocate space for the superblock.
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* EINVAL: The previous newfs operation on this volume did not complete.
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* The administrator must complete newfs before using this volume.
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@ -382,6 +384,17 @@ validate_sblock(struct fs *fs, int flags)
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prtmsg = ((flags & UFS_NOMSG) == 0);
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warnerr = (flags & UFS_NOWARNFAIL) == UFS_NOWARNFAIL ? 0 : ENOENT;
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wmsg = warnerr ? "" : " (Ignored)";
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/*
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* Check for endian mismatch between machine and filesystem.
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*/
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if (((fs->fs_magic != FS_UFS2_MAGIC) &&
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(bswap32(fs->fs_magic) == FS_UFS2_MAGIC)) ||
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((fs->fs_magic != FS_UFS1_MAGIC) &&
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(bswap32(fs->fs_magic) == FS_UFS1_MAGIC))) {
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MPRINT("UFS superblock failed due to endian mismatch "
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"between machine and filesystem\n");
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return(EILSEQ);
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}
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/*
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* If just validating for recovery, then do just the minimal
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* checks needed for the superblock fields needed to find
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@ -627,8 +640,16 @@ ffs_sbsearch(void *devfd, struct fs **fsp, int reqflags,
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* failure can be avoided.
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*/
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flags = UFS_NOMSG | nocsum;
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if (ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc) == 0)
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return (0);
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error = ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc);
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/*
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* If successful or endian error, no need to try further.
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*/
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if (error == 0 || error == EILSEQ) {
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if (msg && error == EILSEQ)
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printf("UFS superblock failed due to endian mismatch "
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"between machine and filesystem\n");
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return (error);
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}
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/*
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* First try: ignoring hash failures.
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*/
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@ -677,6 +698,7 @@ ffs_sbsearch(void *devfd, struct fs **fsp, int reqflags,
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* but some devices lie. So we just try a plausible range.
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*/
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error = ENOENT;
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fsrbuf = NULL;
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for (secsize = dbtob(1); secsize <= SBLOCKSIZE; secsize *= 2)
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if ((error = (*readfunc)(devfd, (SBLOCK_UFS2 - secsize),
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&fsrbuf, secsize)) == 0)
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