--- /dev/null
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#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 "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.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
+xfs_scrub_setup_inode(
+ struct xfs_scrub_context *sc,
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = sc->mp;
+ int error;
+
+ /*
+ * Try to get the inode. If the verifiers fail, we try again
+ * in raw mode.
+ */
+ error = xfs_scrub_get_inode(sc, ip);
+ switch (error) {
+ case 0:
+ break;
+ case -EFSCORRUPTED:
+ case -EFSBADCRC:
+ return 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 = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
+ 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.
+ *
+ * The rules are documented at xfs_ioctl_setattr_check_extsize().
+ * These functions must be kept in sync with each other.
+ */
+STATIC void
+xfs_scrub_inode_extsize(
+ struct xfs_scrub_context *sc,
+ struct xfs_buf *bp,
+ struct xfs_dinode *dip,
+ xfs_ino_t ino,
+ uint16_t mode,
+ uint16_t flags)
+{
+ struct xfs_mount *mp = sc->mp;
+ bool rt_flag;
+ bool hint_flag;
+ bool inherit_flag;
+ uint32_t extsize;
+ uint32_t extsize_bytes;
+ uint32_t blocksize_bytes;
+
+ rt_flag = (flags & XFS_DIFLAG_REALTIME);
+ hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
+ inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
+ extsize = be32_to_cpu(dip->di_extsize);
+ extsize_bytes = XFS_FSB_TO_B(sc->mp, extsize);
+
+ if (rt_flag)
+ blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
+ else
+ blocksize_bytes = mp->m_sb.sb_blocksize;
+
+ if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
+ goto bad;
+
+ if (hint_flag && !S_ISREG(mode))
+ goto bad;
+
+ if (inherit_flag && !S_ISDIR(mode))
+ goto bad;
+
+ if ((hint_flag || inherit_flag) && extsize == 0)
+ goto bad;
+
+ if (!(hint_flag || inherit_flag) && extsize != 0)
+ goto bad;
+
+ if (extsize_bytes % blocksize_bytes)
+ goto bad;
+
+ if (extsize > MAXEXTLEN)
+ goto bad;
+
+ if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
+ goto bad;
+
+ return;
+bad:
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+}
+
+/*
+ * 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
+xfs_scrub_inode_cowextsize(
+ struct xfs_scrub_context *sc,
+ struct xfs_buf *bp,
+ struct xfs_dinode *dip,
+ xfs_ino_t ino,
+ uint16_t mode,
+ uint16_t flags,
+ uint64_t flags2)
+{
+ struct xfs_mount *mp = sc->mp;
+ bool rt_flag;
+ bool hint_flag;
+ uint32_t extsize;
+ uint32_t extsize_bytes;
+
+ rt_flag = (flags & XFS_DIFLAG_REALTIME);
+ hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
+ extsize = be32_to_cpu(dip->di_cowextsize);
+ extsize_bytes = XFS_FSB_TO_B(sc->mp, extsize);
+
+ if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
+ goto bad;
+
+ if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
+ goto bad;
+
+ if (hint_flag && extsize == 0)
+ goto bad;
+
+ if (!hint_flag && extsize != 0)
+ goto bad;
+
+ if (hint_flag && rt_flag)
+ goto bad;
+
+ if (extsize_bytes % mp->m_sb.sb_blocksize)
+ goto bad;
+
+ if (extsize > MAXEXTLEN)
+ goto bad;
+
+ if (extsize > mp->m_sb.sb_agblocks / 2)
+ goto bad;
+
+ return;
+bad:
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+}
+
+/* Make sure the di_flags make sense for the inode. */
+STATIC void
+xfs_scrub_inode_flags(
+ struct xfs_scrub_context *sc,
+ struct xfs_buf *bp,
+ struct xfs_dinode *dip,
+ xfs_ino_t ino,
+ uint16_t mode,
+ uint16_t flags)
+{
+ struct xfs_mount *mp = sc->mp;
+
+ 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:
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+}
+
+/* Make sure the di_flags2 make sense for the inode. */
+STATIC void
+xfs_scrub_inode_flags2(
+ struct xfs_scrub_context *sc,
+ struct xfs_buf *bp,
+ struct xfs_dinode *dip,
+ xfs_ino_t ino,
+ uint16_t mode,
+ uint16_t flags,
+ uint64_t flags2)
+{
+ struct xfs_mount *mp = sc->mp;
+
+ if (flags2 & ~XFS_DIFLAG2_ANY)
+ goto bad;
+
+ /* 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:
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+}
+
+/* Scrub all the ondisk inode fields. */
+STATIC void
+xfs_scrub_dinode(
+ struct xfs_scrub_context *sc,
+ struct xfs_buf *bp,
+ 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);
+ if (mode & ~(S_IALLUGO | S_IFMT))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /* 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.
+ */
+ xfs_scrub_ino_set_preen(sc, bp);
+ break;
+ case 2:
+ case 3:
+ if (dip->di_onlink != 0)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ if (dip->di_mode == 0 && sc->ip)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ if (dip->di_projid_hi != 0 &&
+ !xfs_sb_version_hasprojid32bit(&mp->m_sb))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ default:
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ 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))
+ xfs_scrub_ino_set_warning(sc, bp);
+
+ /* di_format */
+ switch (dip->di_format) {
+ case XFS_DINODE_FMT_DEV:
+ if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
+ !S_ISFIFO(mode) && !S_ISSOCK(mode))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ case XFS_DINODE_FMT_LOCAL:
+ if (!S_ISDIR(mode) && !S_ISLNK(mode))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ case XFS_DINODE_FMT_EXTENTS:
+ if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ if (!S_ISREG(mode) && !S_ISDIR(mode))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ case XFS_DINODE_FMT_UUID:
+ default:
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ }
+
+ /*
+ * 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))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /* Devices, fifos, and sockets must have zero size */
+ if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /* Directories can't be larger than the data section size (32G) */
+ if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /* Symlinks can't be larger than SYMLINK_MAXLEN */
+ if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /*
+ * 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)
+ xfs_scrub_ino_set_warning(sc, bp);
+
+ /* 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)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ } else {
+ if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ }
+
+ xfs_scrub_inode_flags(sc, bp, dip, ino, mode, flags);
+
+ xfs_scrub_inode_extsize(sc, bp, 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)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ if (nextents <= fork_recs)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ default:
+ if (nextents != 0)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ }
+
+ /* di_forkoff */
+ if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ if (dip->di_anextents != 0 && dip->di_forkoff == 0)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /* di_aformat */
+ if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
+ dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
+ dip->di_aformat != XFS_DINODE_FMT_BTREE)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+
+ /* 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)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ if (nextents <= fork_recs)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ break;
+ default:
+ if (nextents != 0)
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ }
+
+ if (dip->di_version >= 3) {
+ xfs_scrub_inode_flags2(sc, bp, dip, ino, mode, flags, flags2);
+ xfs_scrub_inode_cowextsize(sc, bp, dip, ino, mode, flags,
+ flags2);
+ }
+}
+
+/* Map and read a raw inode. */
+STATIC int
+xfs_scrub_inode_map_raw(
+ struct xfs_scrub_context *sc,
+ xfs_ino_t ino,
+ struct xfs_buf **bpp,
+ struct xfs_dinode **dipp)
+{
+ struct xfs_imap imap;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp = NULL;
+ struct xfs_dinode *dip;
+ int error;
+
+ error = xfs_imap(mp, sc->tp, ino, &imap, XFS_IGET_UNTRUSTED);
+ if (error == -EINVAL) {
+ /*
+ * Inode could have gotten deleted out from under us;
+ * just forget about it.
+ */
+ error = -ENOENT;
+ goto out;
+ }
+ if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
+ XFS_INO_TO_AGBNO(mp, ino), &error))
+ goto out;
+
+ error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+ imap.im_blkno, imap.im_len, XBF_UNMAPPED, &bp,
+ NULL);
+ if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
+ XFS_INO_TO_AGBNO(mp, ino), &error))
+ goto out;
+
+ /*
+ * Is this really an inode? We disabled verifiers in the above
+ * xfs_trans_read_buf call because the inode buffer verifier
+ * fails on /any/ inode record in the inode cluster with a bad
+ * magic or version number, not just the one that we're
+ * checking. Therefore, grab the buffer unconditionally, attach
+ * the inode verifiers by hand, and run the inode verifier only
+ * on the one inode we want.
+ */
+ bp->b_ops = &xfs_inode_buf_ops;
+ dip = xfs_buf_offset(bp, imap.im_boffset);
+ if (!xfs_dinode_verify(mp, ino, dip) ||
+ !xfs_dinode_good_version(mp, dip->di_version)) {
+ xfs_scrub_ino_set_corrupt(sc, ino, bp);
+ goto out_buf;
+ }
+
+ /* ...and is it the one we asked for? */
+ if (be32_to_cpu(dip->di_gen) != sc->sm->sm_gen) {
+ error = -ENOENT;
+ goto out_buf;
+ }
+
+ *dipp = dip;
+ *bpp = bp;
+out:
+ return error;
+out_buf:
+ xfs_trans_brelse(sc->tp, bp);
+ return error;
+}
+
+/* Scrub an inode. */
+int
+xfs_scrub_inode(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_dinode di;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp = NULL;
+ struct xfs_dinode *dip;
+ xfs_ino_t ino;
+
+ bool has_shared;
+ int error = 0;
+
+ /* Did we get the in-core inode, or are we doing this manually? */
+ if (sc->ip) {
+ ino = sc->ip->i_ino;
+ xfs_inode_to_disk(sc->ip, &di, 0);
+ dip = &di;
+ } else {
+ /* Map & read inode. */
+ ino = sc->sm->sm_ino;
+ error = xfs_scrub_inode_map_raw(sc, ino, &bp, &dip);
+ if (error || !bp)
+ goto out;
+ }
+
+ xfs_scrub_dinode(sc, bp, dip, ino);
+ if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ goto out;
+
+ /* Now let's do the things that require a live inode. */
+ if (!sc->ip)
+ goto out;
+
+ /*
+ * Does this inode have the reflink flag set but no shared extents?
+ * Set the preening flag if this is the case.
+ */
+ if (xfs_is_reflink_inode(sc->ip)) {
+ error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
+ &has_shared);
+ if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
+ XFS_INO_TO_AGBNO(mp, ino), &error))
+ goto out;
+ if (!has_shared)
+ xfs_scrub_ino_set_preen(sc, bp);
+ }
+
+out:
+ if (bp)
+ xfs_trans_brelse(sc->tp, bp);
+ return error;
+}
projects / platform / kernel / linux-rpi.git / commitdiff