v4.19.13 snapshot.
diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
new file mode 100644
index 0000000..e386c9b
--- /dev/null
+++ b/fs/xfs/scrub/inode.c
@@ -0,0 +1,601 @@
+// 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_defer.h"
+#include "xfs_btree.h"
+#include "xfs_bit.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_inode.h"
+#include "xfs_icache.h"
+#include "xfs_inode_buf.h"
+#include "xfs_inode_fork.h"
+#include "xfs_ialloc.h"
+#include "xfs_da_format.h"
+#include "xfs_reflink.h"
+#include "xfs_rmap.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_util.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/btree.h"
+#include "scrub/trace.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 | XFS_DIFLAG_RTINHERIT)) &&
+ !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;
+
+ return;
+bad:
+ 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 */
+ if (be32_to_cpu(dip->di_atime.t_nsec) >= NSEC_PER_SEC)
+ xchk_ino_set_corrupt(sc, ino);
+ if (be32_to_cpu(dip->di_mtime.t_nsec) >= NSEC_PER_SEC)
+ xchk_ino_set_corrupt(sc, ino);
+ if (be32_to_cpu(dip->di_ctime.t_nsec) >= NSEC_PER_SEC)
+ xchk_ino_set_corrupt(sc, ino);
+
+ /*
+ * 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) {
+ if (be32_to_cpu(dip->di_crtime.t_nsec) >= NSEC_PER_SEC)
+ xchk_ino_set_corrupt(sc, ino);
+ 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)
+{
+ struct xfs_owner_info oinfo;
+ 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);
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
+ xchk_xref_is_owned_by(sc, agbno, 1, &oinfo);
+ 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;
+}