diff options
Diffstat (limited to 'fs/xfs/scrub/inode.c')
| -rw-r--r-- | fs/xfs/scrub/inode.c | 611 |
1 files changed, 611 insertions, 0 deletions
diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c new file mode 100644 index 000000000000..637b7a892313 --- /dev/null +++ b/fs/xfs/scrub/inode.c @@ -0,0 +1,611 @@ +/* + * 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, ino, 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, ino, 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, ino, 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, ino, bp); + } + +out: + if (bp) + xfs_trans_brelse(sc->tp, bp); + return error; +} |