1 files changed, 603 insertions, 0 deletions

diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
new file mode 100644
index 000000000..bb25ff1b7
--- /dev/null
+++ b/fs/xfs/scrub/inode.c
@@ -0,0 +1,603 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Oracle.  All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_btree.h"
+#include "xfs_log_format.h"
+#include "xfs_inode.h"
+#include "xfs_ialloc.h"
+#include "xfs_da_format.h"
+#include "xfs_reflink.h"
+#include "xfs_rmap.h"
+#include "xfs_bmap_util.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/btree.h"
+
+/*
+ * Grab total control of the inode metadata.  It doesn't matter here if
+ * the file data is still changing; exclusive access to the metadata is
+ * the goal.
+ */
+int
+xchk_setup_inode(
+	struct xfs_scrub	*sc,
+	struct xfs_inode	*ip)
+{
+	int			error;
+
+	/*
+	 * Try to get the inode.  If the verifiers fail, we try again
+	 * in raw mode.
+	 */
+	error = xchk_get_inode(sc, ip);
+	switch (error) {
+	case 0:
+		break;
+	case -EFSCORRUPTED:
+	case -EFSBADCRC:
+		return xchk_trans_alloc(sc, 0);
+	default:
+		return error;
+	}
+
+	/* Got the inode, lock it and we're ready to go. */
+	sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
+	xfs_ilock(sc->ip, sc->ilock_flags);
+	error = xchk_trans_alloc(sc, 0);
+	if (error)
+		goto out;
+	sc->ilock_flags |= XFS_ILOCK_EXCL;
+	xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
+
+out:
+	/* scrub teardown will unlock and release the inode for us */
+	return error;
+}
+
+/* Inode core */
+
+/* Validate di_extsize hint. */
+STATIC void
+xchk_inode_extsize(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	xfs_ino_t		ino,
+	uint16_t		mode,
+	uint16_t		flags)
+{
+	xfs_failaddr_t		fa;
+
+	fa = xfs_inode_validate_extsize(sc->mp, be32_to_cpu(dip->di_extsize),
+			mode, flags);
+	if (fa)
+		xchk_ino_set_corrupt(sc, ino);
+}
+
+/*
+ * Validate di_cowextsize hint.
+ *
+ * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
+ * These functions must be kept in sync with each other.
+ */
+STATIC void
+xchk_inode_cowextsize(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	xfs_ino_t		ino,
+	uint16_t		mode,
+	uint16_t		flags,
+	uint64_t		flags2)
+{
+	xfs_failaddr_t		fa;
+
+	fa = xfs_inode_validate_cowextsize(sc->mp,
+			be32_to_cpu(dip->di_cowextsize), mode, flags,
+			flags2);
+	if (fa)
+		xchk_ino_set_corrupt(sc, ino);
+}
+
+/* Make sure the di_flags make sense for the inode. */
+STATIC void
+xchk_inode_flags(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	xfs_ino_t		ino,
+	uint16_t		mode,
+	uint16_t		flags)
+{
+	struct xfs_mount	*mp = sc->mp;
+
+	/* di_flags are all taken, last bit cannot be used */
+	if (flags & ~XFS_DIFLAG_ANY)
+		goto bad;
+
+	/* rt flags require rt device */
+	if ((flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
+		goto bad;
+
+	/* new rt bitmap flag only valid for rbmino */
+	if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
+		goto bad;
+
+	/* directory-only flags */
+	if ((flags & (XFS_DIFLAG_RTINHERIT |
+		     XFS_DIFLAG_EXTSZINHERIT |
+		     XFS_DIFLAG_PROJINHERIT |
+		     XFS_DIFLAG_NOSYMLINKS)) &&
+	    !S_ISDIR(mode))
+		goto bad;
+
+	/* file-only flags */
+	if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
+	    !S_ISREG(mode))
+		goto bad;
+
+	/* filestreams and rt make no sense */
+	if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
+		goto bad;
+
+	return;
+bad:
+	xchk_ino_set_corrupt(sc, ino);
+}
+
+/* Make sure the di_flags2 make sense for the inode. */
+STATIC void
+xchk_inode_flags2(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	xfs_ino_t		ino,
+	uint16_t		mode,
+	uint16_t		flags,
+	uint64_t		flags2)
+{
+	struct xfs_mount	*mp = sc->mp;
+
+	/* Unknown di_flags2 could be from a future kernel */
+	if (flags2 & ~XFS_DIFLAG2_ANY)
+		xchk_ino_set_warning(sc, ino);
+
+	/* reflink flag requires reflink feature */
+	if ((flags2 & XFS_DIFLAG2_REFLINK) &&
+	    !xfs_sb_version_hasreflink(&mp->m_sb))
+		goto bad;
+
+	/* cowextsize flag is checked w.r.t. mode separately */
+
+	/* file/dir-only flags */
+	if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
+		goto bad;
+
+	/* file-only flags */
+	if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
+		goto bad;
+
+	/* realtime and reflink make no sense, currently */
+	if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK))
+		goto bad;
+
+	/* dax and reflink make no sense, currently */
+	if ((flags2 & XFS_DIFLAG2_DAX) && (flags2 & XFS_DIFLAG2_REFLINK))
+		goto bad;
+
+	/* no bigtime iflag without the bigtime feature */
+	if (xfs_dinode_has_bigtime(dip) &&
+	    !xfs_sb_version_hasbigtime(&mp->m_sb))
+		goto bad;
+
+	return;
+bad:
+	xchk_ino_set_corrupt(sc, ino);
+}
+
+static inline void
+xchk_dinode_nsec(
+	struct xfs_scrub	*sc,
+	xfs_ino_t		ino,
+	struct xfs_dinode	*dip,
+	const xfs_timestamp_t	ts)
+{
+	struct timespec64	tv;
+
+	tv = xfs_inode_from_disk_ts(dip, ts);
+	if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
+		xchk_ino_set_corrupt(sc, ino);
+}
+
+/* Scrub all the ondisk inode fields. */
+STATIC void
+xchk_dinode(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	xfs_ino_t		ino)
+{
+	struct xfs_mount	*mp = sc->mp;
+	size_t			fork_recs;
+	unsigned long long	isize;
+	uint64_t		flags2;
+	uint32_t		nextents;
+	uint16_t		flags;
+	uint16_t		mode;
+
+	flags = be16_to_cpu(dip->di_flags);
+	if (dip->di_version >= 3)
+		flags2 = be64_to_cpu(dip->di_flags2);
+	else
+		flags2 = 0;
+
+	/* di_mode */
+	mode = be16_to_cpu(dip->di_mode);
+	switch (mode & S_IFMT) {
+	case S_IFLNK:
+	case S_IFREG:
+	case S_IFDIR:
+	case S_IFCHR:
+	case S_IFBLK:
+	case S_IFIFO:
+	case S_IFSOCK:
+		/* mode is recognized */
+		break;
+	default:
+		xchk_ino_set_corrupt(sc, ino);
+		break;
+	}
+
+	/* v1/v2 fields */
+	switch (dip->di_version) {
+	case 1:
+		/*
+		 * We autoconvert v1 inodes into v2 inodes on writeout,
+		 * so just mark this inode for preening.
+		 */
+		xchk_ino_set_preen(sc, ino);
+		break;
+	case 2:
+	case 3:
+		if (dip->di_onlink != 0)
+			xchk_ino_set_corrupt(sc, ino);
+
+		if (dip->di_mode == 0 && sc->ip)
+			xchk_ino_set_corrupt(sc, ino);
+
+		if (dip->di_projid_hi != 0 &&
+		    !xfs_sb_version_hasprojid32bit(&mp->m_sb))
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	default:
+		xchk_ino_set_corrupt(sc, ino);
+		return;
+	}
+
+	/*
+	 * di_uid/di_gid -- -1 isn't invalid, but there's no way that
+	 * userspace could have created that.
+	 */
+	if (dip->di_uid == cpu_to_be32(-1U) ||
+	    dip->di_gid == cpu_to_be32(-1U))
+		xchk_ino_set_warning(sc, ino);
+
+	/* di_format */
+	switch (dip->di_format) {
+	case XFS_DINODE_FMT_DEV:
+		if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
+		    !S_ISFIFO(mode) && !S_ISSOCK(mode))
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		if (!S_ISDIR(mode) && !S_ISLNK(mode))
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	case XFS_DINODE_FMT_EXTENTS:
+		if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if (!S_ISREG(mode) && !S_ISDIR(mode))
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	case XFS_DINODE_FMT_UUID:
+	default:
+		xchk_ino_set_corrupt(sc, ino);
+		break;
+	}
+
+	/* di_[amc]time.nsec */
+	xchk_dinode_nsec(sc, ino, dip, dip->di_atime);
+	xchk_dinode_nsec(sc, ino, dip, dip->di_mtime);
+	xchk_dinode_nsec(sc, ino, dip, dip->di_ctime);
+
+	/*
+	 * di_size.  xfs_dinode_verify checks for things that screw up
+	 * the VFS such as the upper bit being set and zero-length
+	 * symlinks/directories, but we can do more here.
+	 */
+	isize = be64_to_cpu(dip->di_size);
+	if (isize & (1ULL << 63))
+		xchk_ino_set_corrupt(sc, ino);
+
+	/* Devices, fifos, and sockets must have zero size */
+	if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
+		xchk_ino_set_corrupt(sc, ino);
+
+	/* Directories can't be larger than the data section size (32G) */
+	if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
+		xchk_ino_set_corrupt(sc, ino);
+
+	/* Symlinks can't be larger than SYMLINK_MAXLEN */
+	if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
+		xchk_ino_set_corrupt(sc, ino);
+
+	/*
+	 * Warn if the running kernel can't handle the kinds of offsets
+	 * needed to deal with the file size.  In other words, if the
+	 * pagecache can't cache all the blocks in this file due to
+	 * overly large offsets, flag the inode for admin review.
+	 */
+	if (isize >= mp->m_super->s_maxbytes)
+		xchk_ino_set_warning(sc, ino);
+
+	/* di_nblocks */
+	if (flags2 & XFS_DIFLAG2_REFLINK) {
+		; /* nblocks can exceed dblocks */
+	} else if (flags & XFS_DIFLAG_REALTIME) {
+		/*
+		 * nblocks is the sum of data extents (in the rtdev),
+		 * attr extents (in the datadev), and both forks' bmbt
+		 * blocks (in the datadev).  This clumsy check is the
+		 * best we can do without cross-referencing with the
+		 * inode forks.
+		 */
+		if (be64_to_cpu(dip->di_nblocks) >=
+		    mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
+			xchk_ino_set_corrupt(sc, ino);
+	} else {
+		if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
+			xchk_ino_set_corrupt(sc, ino);
+	}
+
+	xchk_inode_flags(sc, dip, ino, mode, flags);
+
+	xchk_inode_extsize(sc, dip, ino, mode, flags);
+
+	/* di_nextents */
+	nextents = be32_to_cpu(dip->di_nextents);
+	fork_recs =  XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
+	switch (dip->di_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		if (nextents > fork_recs)
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if (nextents <= fork_recs)
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	default:
+		if (nextents != 0)
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	}
+
+	/* di_forkoff */
+	if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
+		xchk_ino_set_corrupt(sc, ino);
+	if (dip->di_anextents != 0 && dip->di_forkoff == 0)
+		xchk_ino_set_corrupt(sc, ino);
+	if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
+		xchk_ino_set_corrupt(sc, ino);
+
+	/* di_aformat */
+	if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
+	    dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
+	    dip->di_aformat != XFS_DINODE_FMT_BTREE)
+		xchk_ino_set_corrupt(sc, ino);
+
+	/* di_anextents */
+	nextents = be16_to_cpu(dip->di_anextents);
+	fork_recs =  XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
+	switch (dip->di_aformat) {
+	case XFS_DINODE_FMT_EXTENTS:
+		if (nextents > fork_recs)
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if (nextents <= fork_recs)
+			xchk_ino_set_corrupt(sc, ino);
+		break;
+	default:
+		if (nextents != 0)
+			xchk_ino_set_corrupt(sc, ino);
+	}
+
+	if (dip->di_version >= 3) {
+		xchk_dinode_nsec(sc, ino, dip, dip->di_crtime);
+		xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
+		xchk_inode_cowextsize(sc, dip, ino, mode, flags,
+				flags2);
+	}
+}
+
+/*
+ * Make sure the finobt doesn't think this inode is free.
+ * We don't have to check the inobt ourselves because we got the inode via
+ * IGET_UNTRUSTED, which checks the inobt for us.
+ */
+static void
+xchk_inode_xref_finobt(
+	struct xfs_scrub		*sc,
+	xfs_ino_t			ino)
+{
+	struct xfs_inobt_rec_incore	rec;
+	xfs_agino_t			agino;
+	int				has_record;
+	int				error;
+
+	if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm))
+		return;
+
+	agino = XFS_INO_TO_AGINO(sc->mp, ino);
+
+	/*
+	 * Try to get the finobt record.  If we can't get it, then we're
+	 * in good shape.
+	 */
+	error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
+			&has_record);
+	if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
+	    !has_record)
+		return;
+
+	error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
+	if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
+	    !has_record)
+		return;
+
+	/*
+	 * Otherwise, make sure this record either doesn't cover this inode,
+	 * or that it does but it's marked present.
+	 */
+	if (rec.ir_startino > agino ||
+	    rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
+		return;
+
+	if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))
+		xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0);
+}
+
+/* Cross reference the inode fields with the forks. */
+STATIC void
+xchk_inode_xref_bmap(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip)
+{
+	xfs_extnum_t		nextents;
+	xfs_filblks_t		count;
+	xfs_filblks_t		acount;
+	int			error;
+
+	if (xchk_skip_xref(sc->sm))
+		return;
+
+	/* Walk all the extents to check nextents/naextents/nblocks. */
+	error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
+			&nextents, &count);
+	if (!xchk_should_check_xref(sc, &error, NULL))
+		return;
+	if (nextents < be32_to_cpu(dip->di_nextents))
+		xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
+
+	error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
+			&nextents, &acount);
+	if (!xchk_should_check_xref(sc, &error, NULL))
+		return;
+	if (nextents != be16_to_cpu(dip->di_anextents))
+		xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
+
+	/* Check nblocks against the inode. */
+	if (count + acount != be64_to_cpu(dip->di_nblocks))
+		xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
+}
+
+/* Cross-reference with the other btrees. */
+STATIC void
+xchk_inode_xref(
+	struct xfs_scrub	*sc,
+	xfs_ino_t		ino,
+	struct xfs_dinode	*dip)
+{
+	xfs_agnumber_t		agno;
+	xfs_agblock_t		agbno;
+	int			error;
+
+	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+		return;
+
+	agno = XFS_INO_TO_AGNO(sc->mp, ino);
+	agbno = XFS_INO_TO_AGBNO(sc->mp, ino);
+
+	error = xchk_ag_init(sc, agno, &sc->sa);
+	if (!xchk_xref_process_error(sc, agno, agbno, &error))
+		return;
+
+	xchk_xref_is_used_space(sc, agbno, 1);
+	xchk_inode_xref_finobt(sc, ino);
+	xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES);
+	xchk_xref_is_not_shared(sc, agbno, 1);
+	xchk_inode_xref_bmap(sc, dip);
+
+	xchk_ag_free(sc, &sc->sa);
+}
+
+/*
+ * If the reflink iflag disagrees with a scan for shared data fork extents,
+ * either flag an error (shared extents w/ no flag) or a preen (flag set w/o
+ * any shared extents).  We already checked for reflink iflag set on a non
+ * reflink filesystem.
+ */
+static void
+xchk_inode_check_reflink_iflag(
+	struct xfs_scrub	*sc,
+	xfs_ino_t		ino)
+{
+	struct xfs_mount	*mp = sc->mp;
+	bool			has_shared;
+	int			error;
+
+	if (!xfs_sb_version_hasreflink(&mp->m_sb))
+		return;
+
+	error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
+			&has_shared);
+	if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
+			XFS_INO_TO_AGBNO(mp, ino), &error))
+		return;
+	if (xfs_is_reflink_inode(sc->ip) && !has_shared)
+		xchk_ino_set_preen(sc, ino);
+	else if (!xfs_is_reflink_inode(sc->ip) && has_shared)
+		xchk_ino_set_corrupt(sc, ino);
+}
+
+/* Scrub an inode. */
+int
+xchk_inode(
+	struct xfs_scrub	*sc)
+{
+	struct xfs_dinode	di;
+	int			error = 0;
+
+	/*
+	 * If sc->ip is NULL, that means that the setup function called
+	 * xfs_iget to look up the inode.  xfs_iget returned a EFSCORRUPTED
+	 * and a NULL inode, so flag the corruption error and return.
+	 */
+	if (!sc->ip) {
+		xchk_ino_set_corrupt(sc, sc->sm->sm_ino);
+		return 0;
+	}
+
+	/* Scrub the inode core. */
+	xfs_inode_to_disk(sc->ip, &di, 0);
+	xchk_dinode(sc, &di, sc->ip->i_ino);
+	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+		goto out;
+
+	/*
+	 * Look for discrepancies between file's data blocks and the reflink
+	 * iflag.  We already checked the iflag against the file mode when
+	 * we scrubbed the dinode.
+	 */
+	if (S_ISREG(VFS_I(sc->ip)->i_mode))
+		xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino);
+
+	xchk_inode_xref(sc, sc->ip->i_ino, &di);
+out:
+	return error;
+}