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xfs: repair inode records

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If an inode is so badly damaged that it cannot be loaded into the cache,
fix the ondisk metadata and try again.  If there /is/ a cached inode,
fix any problems and apply any optimizations that can be solved incore.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2023-12-15 10:03:36 -08:00
parent d9041681dd
commit 2d295fe657
7 changed files with 1018 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/xfs/Makefile
View File

@ -184,6 +184,7 @@ xfs-y += $(addprefix scrub/, \
agheader_repair.o \
alloc_repair.o \
ialloc_repair.o \
inode_repair.o \
newbt.o \
reap.o \
refcount_repair.o \

6
fs/xfs/scrub/inode.c
View File

@ -25,6 +25,7 @@
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"
#include "scrub/repair.h"
/* Prepare the attached inode for scrubbing. */
static inline int
@ -185,8 +186,11 @@ xchk_setup_inode(
* saying the inode is allocated and the icache being unable to load
* the inode until we can flag the corruption in xchk_inode. The
* scrub function has to note the corruption, since we're not really
* supposed to do that from the setup function.
* supposed to do that from the setup function. Save the mapping to
* make repairs to the ondisk inode buffer.
*/
if (xchk_could_repair(sc))
xrep_setup_inode(sc, &imap);
return 0;
out_cancel:

820
fs/xfs/scrub/inode_repair.c Normal file
View File

@ -0,0 +1,820 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2018-2023 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#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 "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_quota_defs.h"
#include "xfs_quota.h"
#include "xfs_ag.h"
#include "xfs_rtbitmap.h"
#include "xfs_health.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"
#include "scrub/repair.h"
/*
* Inode Record Repair
* ===================
*
* Roughly speaking, inode problems can be classified based on whether or not
* they trip the dinode verifiers. If those trip, then we won't be able to
* xfs_iget ourselves the inode.
*
* Therefore, the xrep_dinode_* functions fix anything that will cause the
* inode buffer verifier or the dinode verifier. The xrep_inode_* functions
* fix things on live incore inodes. The inode repair functions make decisions
* with security and usability implications when reviving a file:
*
* - Files with zero di_mode or a garbage di_mode are converted to regular file
* that only root can read. This file may not actually contain user data,
* if the file was not previously a regular file. Setuid and setgid bits
* are cleared.
*
* - Zero-size directories can be truncated to look empty. It is necessary to
* run the bmapbtd and directory repair functions to fully rebuild the
* directory.
*
* - Zero-size symbolic link targets can be truncated to '?'. It is necessary
* to run the bmapbtd and symlink repair functions to salvage the symlink.
*
* - Invalid extent size hints will be removed.
*
* - Quotacheck will be scheduled if we repaired an inode that was so badly
* damaged that the ondisk inode had to be rebuilt.
*
* - Invalid user, group, or project IDs (aka -1U) will be reset to zero.
* Setuid and setgid bits are cleared.
*/
/*
* All the information we need to repair the ondisk inode if we can't iget the
* incore inode. We don't allocate this buffer unless we're going to perform
* a repair to the ondisk inode cluster buffer.
*/
struct xrep_inode {
/* Inode mapping that we saved from the initial lookup attempt. */
struct xfs_imap imap;
struct xfs_scrub *sc;
/* Sick state to set after zapping parts of the inode. */
unsigned int ino_sick_mask;
};
/*
* Setup function for inode repair. @imap contains the ondisk inode mapping
* information so that we can correct the ondisk inode cluster buffer if
* necessary to make iget work.
*/
int
xrep_setup_inode(
struct xfs_scrub *sc,
const struct xfs_imap *imap)
{
struct xrep_inode *ri;
sc->buf = kzalloc(sizeof(struct xrep_inode), XCHK_GFP_FLAGS);
if (!sc->buf)
return -ENOMEM;
ri = sc->buf;
memcpy(&ri->imap, imap, sizeof(struct xfs_imap));
ri->sc = sc;
return 0;
}
/*
* Make sure this ondisk inode can pass the inode buffer verifier. This is
* not the same as the dinode verifier.
*/
STATIC void
xrep_dinode_buf_core(
struct xfs_scrub *sc,
struct xfs_buf *bp,
unsigned int ioffset)
{
struct xfs_dinode *dip = xfs_buf_offset(bp, ioffset);
struct xfs_trans *tp = sc->tp;
struct xfs_mount *mp = sc->mp;
xfs_agino_t agino;
bool crc_ok = false;
bool magic_ok = false;
bool unlinked_ok = false;
agino = be32_to_cpu(dip->di_next_unlinked);
if (xfs_verify_agino_or_null(bp->b_pag, agino))
unlinked_ok = true;
if (dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
xfs_dinode_good_version(mp, dip->di_version))
magic_ok = true;
if (xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
XFS_DINODE_CRC_OFF))
crc_ok = true;
if (magic_ok && unlinked_ok && crc_ok)
return;
if (!magic_ok) {
dip->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
dip->di_version = 3;
}
if (!unlinked_ok)
dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
xfs_dinode_calc_crc(mp, dip);
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
xfs_trans_log_buf(tp, bp, ioffset,
ioffset + sizeof(struct xfs_dinode) - 1);
}
/* Make sure this inode cluster buffer can pass the inode buffer verifier. */
STATIC void
xrep_dinode_buf(
struct xfs_scrub *sc,
struct xfs_buf *bp)
{
struct xfs_mount *mp = sc->mp;
int i;
int ni;
ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
for (i = 0; i < ni; i++)
xrep_dinode_buf_core(sc, bp, i << mp->m_sb.sb_inodelog);
}
/* Reinitialize things that never change in an inode. */
STATIC void
xrep_dinode_header(
struct xfs_scrub *sc,
struct xfs_dinode *dip)
{
trace_xrep_dinode_header(sc, dip);
dip->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
if (!xfs_dinode_good_version(sc->mp, dip->di_version))
dip->di_version = 3;
dip->di_ino = cpu_to_be64(sc->sm->sm_ino);
uuid_copy(&dip->di_uuid, &sc->mp->m_sb.sb_meta_uuid);
dip->di_gen = cpu_to_be32(sc->sm->sm_gen);
}
/* Turn di_mode into /something/ recognizable. */
STATIC void
xrep_dinode_mode(
struct xfs_scrub *sc,
struct xfs_dinode *dip)
{
uint16_t mode = be16_to_cpu(dip->di_mode);
trace_xrep_dinode_mode(sc, dip);
if (mode == 0 || xfs_mode_to_ftype(mode) != XFS_DIR3_FT_UNKNOWN)
return;
/* bad mode, so we set it to a file that only root can read */
mode = S_IFREG;
dip->di_mode = cpu_to_be16(mode);
dip->di_uid = 0;
dip->di_gid = 0;
}
/* Fix any conflicting flags that the verifiers complain about. */
STATIC void
xrep_dinode_flags(
struct xfs_scrub *sc,
struct xfs_dinode *dip)
{
struct xfs_mount *mp = sc->mp;
uint64_t flags2 = be64_to_cpu(dip->di_flags2);
uint16_t flags = be16_to_cpu(dip->di_flags);
uint16_t mode = be16_to_cpu(dip->di_mode);
trace_xrep_dinode_flags(sc, dip);
/*
* For regular files on a reflink filesystem, set the REFLINK flag to
* protect shared extents. A later stage will actually check those
* extents and clear the flag if possible.
*/
if (xfs_has_reflink(mp) && S_ISREG(mode))
flags2 |= XFS_DIFLAG2_REFLINK;
else
flags2 &= ~(XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE);
if (flags & XFS_DIFLAG_REALTIME)
flags2 &= ~XFS_DIFLAG2_REFLINK;
if (!xfs_has_bigtime(mp))
flags2 &= ~XFS_DIFLAG2_BIGTIME;
if (!xfs_has_large_extent_counts(mp))
flags2 &= ~XFS_DIFLAG2_NREXT64;
if (flags2 & XFS_DIFLAG2_NREXT64)
dip->di_nrext64_pad = 0;
else if (dip->di_version >= 3)
dip->di_v3_pad = 0;
dip->di_flags = cpu_to_be16(flags);
dip->di_flags2 = cpu_to_be64(flags2);
}
/*
* Blow out symlink; now it points nowhere. We don't have to worry about
* incore state because this inode is failing the verifiers.
*/
STATIC void
xrep_dinode_zap_symlink(
struct xrep_inode *ri,
struct xfs_dinode *dip)
{
struct xfs_scrub *sc = ri->sc;
char *p;
trace_xrep_dinode_zap_symlink(sc, dip);
dip->di_format = XFS_DINODE_FMT_LOCAL;
dip->di_size = cpu_to_be64(1);
p = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
*p = '?';
ri->ino_sick_mask |= XFS_SICK_INO_SYMLINK_ZAPPED;
}
/*
* Blow out dir, make the parent point to the root. In the future repair will
* reconstruct this directory for us. Note that there's no in-core directory
* inode because the sf verifier tripped, so we don't have to worry about the
* dentry cache.
*/
STATIC void
xrep_dinode_zap_dir(
struct xrep_inode *ri,
struct xfs_dinode *dip)
{
struct xfs_scrub *sc = ri->sc;
struct xfs_mount *mp = sc->mp;
struct xfs_dir2_sf_hdr *sfp;
int i8count;
trace_xrep_dinode_zap_dir(sc, dip);
dip->di_format = XFS_DINODE_FMT_LOCAL;
i8count = mp->m_sb.sb_rootino > XFS_DIR2_MAX_SHORT_INUM;
sfp = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
sfp->count = 0;
sfp->i8count = i8count;
xfs_dir2_sf_put_parent_ino(sfp, mp->m_sb.sb_rootino);
dip->di_size = cpu_to_be64(xfs_dir2_sf_hdr_size(i8count));
ri->ino_sick_mask |= XFS_SICK_INO_DIR_ZAPPED;
}
/* Make sure we don't have a garbage file size. */
STATIC void
xrep_dinode_size(
struct xrep_inode *ri,
struct xfs_dinode *dip)
{
struct xfs_scrub *sc = ri->sc;
uint64_t size = be64_to_cpu(dip->di_size);
uint16_t mode = be16_to_cpu(dip->di_mode);
trace_xrep_dinode_size(sc, dip);
switch (mode & S_IFMT) {
case S_IFIFO:
case S_IFCHR:
case S_IFBLK:
case S_IFSOCK:
/* di_size can't be nonzero for special files */
dip->di_size = 0;
break;
case S_IFREG:
/* Regular files can't be larger than 2^63-1 bytes. */
dip->di_size = cpu_to_be64(size & ~(1ULL << 63));
break;
case S_IFLNK:
/*
* Truncate ridiculously oversized symlinks. If the size is
* zero, reset it to point to the current directory. Both of
* these conditions trigger dinode verifier errors, so there
* is no in-core state to reset.
*/
if (size > XFS_SYMLINK_MAXLEN)
dip->di_size = cpu_to_be64(XFS_SYMLINK_MAXLEN);
else if (size == 0)
xrep_dinode_zap_symlink(ri, dip);
break;
case S_IFDIR:
/*
* Directories can't have a size larger than 32G. If the size
* is zero, reset it to an empty directory. Both of these
* conditions trigger dinode verifier errors, so there is no
* in-core state to reset.
*/
if (size > XFS_DIR2_SPACE_SIZE)
dip->di_size = cpu_to_be64(XFS_DIR2_SPACE_SIZE);
else if (size == 0)
xrep_dinode_zap_dir(ri, dip);
break;
}
}
/* Fix extent size hints. */
STATIC void
xrep_dinode_extsize_hints(
struct xfs_scrub *sc,
struct xfs_dinode *dip)
{
struct xfs_mount *mp = sc->mp;
uint64_t flags2 = be64_to_cpu(dip->di_flags2);
uint16_t flags = be16_to_cpu(dip->di_flags);
uint16_t mode = be16_to_cpu(dip->di_mode);
xfs_failaddr_t fa;
trace_xrep_dinode_extsize_hints(sc, dip);
fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
mode, flags);
if (fa) {
dip->di_extsize = 0;
dip->di_flags &= ~cpu_to_be16(XFS_DIFLAG_EXTSIZE |
XFS_DIFLAG_EXTSZINHERIT);
}
if (dip->di_version < 3)
return;
fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
mode, flags, flags2);
if (fa) {
dip->di_cowextsize = 0;
dip->di_flags2 &= ~cpu_to_be64(XFS_DIFLAG2_COWEXTSIZE);
}
}
/* Inode didn't pass dinode verifiers, so fix the raw buffer and retry iget. */
STATIC int
xrep_dinode_core(
struct xrep_inode *ri)
{
struct xfs_scrub *sc = ri->sc;
struct xfs_buf *bp;
struct xfs_dinode *dip;
xfs_ino_t ino = sc->sm->sm_ino;
int error;
int iget_error;
/* Read the inode cluster buffer. */
error = xfs_trans_read_buf(sc->mp, sc->tp, sc->mp->m_ddev_targp,
ri->imap.im_blkno, ri->imap.im_len, XBF_UNMAPPED, &bp,
NULL);
if (error)
return error;
/* Make sure we can pass the inode buffer verifier. */
xrep_dinode_buf(sc, bp);
bp->b_ops = &xfs_inode_buf_ops;
/* Fix everything the verifier will complain about. */
dip = xfs_buf_offset(bp, ri->imap.im_boffset);
xrep_dinode_header(sc, dip);
xrep_dinode_mode(sc, dip);
xrep_dinode_flags(sc, dip);
xrep_dinode_size(ri, dip);
xrep_dinode_extsize_hints(sc, dip);
/* Write out the inode. */
trace_xrep_dinode_fixed(sc, dip);
xfs_dinode_calc_crc(sc->mp, dip);
xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_DINO_BUF);
xfs_trans_log_buf(sc->tp, bp, ri->imap.im_boffset,
ri->imap.im_boffset + sc->mp->m_sb.sb_inodesize - 1);
/*
* In theory, we've fixed the ondisk inode record enough that we should
* be able to load the inode into the cache. Try to iget that inode
* now while we hold the AGI and the inode cluster buffer and take the
* IOLOCK so that we can continue with repairs without anyone else
* accessing the inode. If iget fails, we still need to commit the
* changes.
*/
iget_error = xchk_iget(sc, ino, &sc->ip);
if (!iget_error)
xchk_ilock(sc, XFS_IOLOCK_EXCL);
/*
* Commit the inode cluster buffer updates and drop the AGI buffer that
* we've been holding since scrub setup. From here on out, repairs
* deal only with the cached inode.
*/
error = xrep_trans_commit(sc);
if (error)
return error;
if (iget_error)
return iget_error;
error = xchk_trans_alloc(sc, 0);
if (error)
return error;
error = xrep_ino_dqattach(sc);
if (error)
return error;
xchk_ilock(sc, XFS_ILOCK_EXCL);
if (ri->ino_sick_mask)
xfs_inode_mark_sick(sc->ip, ri->ino_sick_mask);
return 0;
}
/* Fix everything xfs_dinode_verify cares about. */
STATIC int
xrep_dinode_problems(
struct xrep_inode *ri)
{
struct xfs_scrub *sc = ri->sc;
int error;
error = xrep_dinode_core(ri);
if (error)
return error;
/* We had to fix a totally busted inode, schedule quotacheck. */
if (XFS_IS_UQUOTA_ON(sc->mp))
xrep_force_quotacheck(sc, XFS_DQTYPE_USER);
if (XFS_IS_GQUOTA_ON(sc->mp))
xrep_force_quotacheck(sc, XFS_DQTYPE_GROUP);
if (XFS_IS_PQUOTA_ON(sc->mp))
xrep_force_quotacheck(sc, XFS_DQTYPE_PROJ);
return 0;
}
/*
* Fix problems that the verifiers don't care about. In general these are
* errors that don't cause problems elsewhere in the kernel that we can easily
* detect, so we don't check them all that rigorously.
*/
/* Make sure block and extent counts are ok. */
STATIC int
xrep_inode_blockcounts(
struct xfs_scrub *sc)
{
struct xfs_ifork *ifp;
xfs_filblks_t count;
xfs_filblks_t acount;
xfs_extnum_t nextents;
int error;
trace_xrep_inode_blockcounts(sc);
/* Set data fork counters from the data fork mappings. */
error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
&nextents, &count);
if (error)
return error;
if (xfs_is_reflink_inode(sc->ip)) {
/*
* data fork blockcount can exceed physical storage if a user
* reflinks the same block over and over again.
*/
;
} else if (XFS_IS_REALTIME_INODE(sc->ip)) {
if (count >= sc->mp->m_sb.sb_rblocks)
return -EFSCORRUPTED;
} else {
if (count >= sc->mp->m_sb.sb_dblocks)
return -EFSCORRUPTED;
}
error = xrep_ino_ensure_extent_count(sc, XFS_DATA_FORK, nextents);
if (error)
return error;
sc->ip->i_df.if_nextents = nextents;
/* Set attr fork counters from the attr fork mappings. */
ifp = xfs_ifork_ptr(sc->ip, XFS_ATTR_FORK);
if (ifp) {
error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
&nextents, &acount);
if (error)
return error;
if (count >= sc->mp->m_sb.sb_dblocks)
return -EFSCORRUPTED;
error = xrep_ino_ensure_extent_count(sc, XFS_ATTR_FORK,
nextents);
if (error)
return error;
ifp->if_nextents = nextents;
} else {
acount = 0;
}
sc->ip->i_nblocks = count + acount;
return 0;
}
/* Check for invalid uid/gid/prid. */
STATIC void
xrep_inode_ids(
struct xfs_scrub *sc)
{
bool dirty = false;
trace_xrep_inode_ids(sc);
if (!uid_valid(VFS_I(sc->ip)->i_uid)) {
i_uid_write(VFS_I(sc->ip), 0);
dirty = true;
if (XFS_IS_UQUOTA_ON(sc->mp))
xrep_force_quotacheck(sc, XFS_DQTYPE_USER);
}
if (!gid_valid(VFS_I(sc->ip)->i_gid)) {
i_gid_write(VFS_I(sc->ip), 0);
dirty = true;
if (XFS_IS_GQUOTA_ON(sc->mp))
xrep_force_quotacheck(sc, XFS_DQTYPE_GROUP);
}
if (sc->ip->i_projid == -1U) {
sc->ip->i_projid = 0;
dirty = true;
if (XFS_IS_PQUOTA_ON(sc->mp))
xrep_force_quotacheck(sc, XFS_DQTYPE_PROJ);
}
/* strip setuid/setgid if we touched any of the ids */
if (dirty)
VFS_I(sc->ip)->i_mode &= ~(S_ISUID | S_ISGID);
}
static inline void
xrep_clamp_timestamp(
struct xfs_inode *ip,
struct timespec64 *ts)
{
ts->tv_nsec = clamp_t(long, ts->tv_nsec, 0, NSEC_PER_SEC);
*ts = timestamp_truncate(*ts, VFS_I(ip));
}
/* Nanosecond counters can't have more than 1 billion. */
STATIC void
xrep_inode_timestamps(
struct xfs_inode *ip)
{
struct timespec64 tstamp;
struct inode *inode = VFS_I(ip);
tstamp = inode_get_atime(inode);
xrep_clamp_timestamp(ip, &tstamp);
inode_set_atime_to_ts(inode, tstamp);
tstamp = inode_get_mtime(inode);
xrep_clamp_timestamp(ip, &tstamp);
inode_set_mtime_to_ts(inode, tstamp);
tstamp = inode_get_ctime(inode);
xrep_clamp_timestamp(ip, &tstamp);
inode_set_ctime_to_ts(inode, tstamp);
xrep_clamp_timestamp(ip, &ip->i_crtime);
}
/* Fix inode flags that don't make sense together. */
STATIC void
xrep_inode_flags(
struct xfs_scrub *sc)
{
uint16_t mode;
trace_xrep_inode_flags(sc);
mode = VFS_I(sc->ip)->i_mode;
/* Clear junk flags */
if (sc->ip->i_diflags & ~XFS_DIFLAG_ANY)
sc->ip->i_diflags &= ~XFS_DIFLAG_ANY;
/* NEWRTBM only applies to realtime bitmaps */
if (sc->ip->i_ino == sc->mp->m_sb.sb_rbmino)
sc->ip->i_diflags |= XFS_DIFLAG_NEWRTBM;
else
sc->ip->i_diflags &= ~XFS_DIFLAG_NEWRTBM;
/* These only make sense for directories. */
if (!S_ISDIR(mode))
sc->ip->i_diflags &= ~(XFS_DIFLAG_RTINHERIT |
XFS_DIFLAG_EXTSZINHERIT |
XFS_DIFLAG_PROJINHERIT |
XFS_DIFLAG_NOSYMLINKS);
/* These only make sense for files. */
if (!S_ISREG(mode))
sc->ip->i_diflags &= ~(XFS_DIFLAG_REALTIME |
XFS_DIFLAG_EXTSIZE);
/* These only make sense for non-rt files. */
if (sc->ip->i_diflags & XFS_DIFLAG_REALTIME)
sc->ip->i_diflags &= ~XFS_DIFLAG_FILESTREAM;
/* Immutable and append only? Drop the append. */
if ((sc->ip->i_diflags & XFS_DIFLAG_IMMUTABLE) &&
(sc->ip->i_diflags & XFS_DIFLAG_APPEND))
sc->ip->i_diflags &= ~XFS_DIFLAG_APPEND;
/* Clear junk flags. */
if (sc->ip->i_diflags2 & ~XFS_DIFLAG2_ANY)
sc->ip->i_diflags2 &= ~XFS_DIFLAG2_ANY;
/* No reflink flag unless we support it and it's a file. */
if (!xfs_has_reflink(sc->mp) || !S_ISREG(mode))
sc->ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
/* DAX only applies to files and dirs. */
if (!(S_ISREG(mode) || S_ISDIR(mode)))
sc->ip->i_diflags2 &= ~XFS_DIFLAG2_DAX;
/* No reflink files on the realtime device. */
if (sc->ip->i_diflags & XFS_DIFLAG_REALTIME)
sc->ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
}
/*
* Fix size problems with block/node format directories. If we fail to find
* the extent list, just bail out and let the bmapbtd repair functions clean
* up that mess.
*/
STATIC void
xrep_inode_blockdir_size(
struct xfs_scrub *sc)
{
struct xfs_iext_cursor icur;
struct xfs_bmbt_irec got;
struct xfs_ifork *ifp;
xfs_fileoff_t off;
int error;
trace_xrep_inode_blockdir_size(sc);
error = xfs_iread_extents(sc->tp, sc->ip, XFS_DATA_FORK);
if (error)
return;
/* Find the last block before 32G; this is the dir size. */
ifp = xfs_ifork_ptr(sc->ip, XFS_DATA_FORK);
off = XFS_B_TO_FSB(sc->mp, XFS_DIR2_SPACE_SIZE);
if (!xfs_iext_lookup_extent_before(sc->ip, ifp, &off, &icur, &got)) {
/* zero-extents directory? */
return;
}
off = got.br_startoff + got.br_blockcount;
sc->ip->i_disk_size = min_t(loff_t, XFS_DIR2_SPACE_SIZE,
XFS_FSB_TO_B(sc->mp, off));
}
/* Fix size problems with short format directories. */
STATIC void
xrep_inode_sfdir_size(
struct xfs_scrub *sc)
{
struct xfs_ifork *ifp;
trace_xrep_inode_sfdir_size(sc);
ifp = xfs_ifork_ptr(sc->ip, XFS_DATA_FORK);
sc->ip->i_disk_size = ifp->if_bytes;
}
/*
* Fix any irregularities in a directory inode's size now that we can iterate
* extent maps and access other regular inode data.
*/
STATIC void
xrep_inode_dir_size(
struct xfs_scrub *sc)
{
trace_xrep_inode_dir_size(sc);
switch (sc->ip->i_df.if_format) {
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
xrep_inode_blockdir_size(sc);
break;
case XFS_DINODE_FMT_LOCAL:
xrep_inode_sfdir_size(sc);
break;
}
}
/* Fix extent size hint problems. */
STATIC void
xrep_inode_extsize(
struct xfs_scrub *sc)
{
/* Fix misaligned extent size hints on a directory. */
if ((sc->ip->i_diflags & XFS_DIFLAG_RTINHERIT) &&
(sc->ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT) &&
xfs_extlen_to_rtxmod(sc->mp, sc->ip->i_extsize) > 0) {
sc->ip->i_extsize = 0;
sc->ip->i_diflags &= ~XFS_DIFLAG_EXTSZINHERIT;
}
}
/* Fix any irregularities in an inode that the verifiers don't catch. */
STATIC int
xrep_inode_problems(
struct xfs_scrub *sc)
{
int error;
error = xrep_inode_blockcounts(sc);
if (error)
return error;
xrep_inode_timestamps(sc->ip);
xrep_inode_flags(sc);
xrep_inode_ids(sc);
/*
* We can now do a better job fixing the size of a directory now that
* we can scan the data fork extents than we could in xrep_dinode_size.
*/
if (S_ISDIR(VFS_I(sc->ip)->i_mode))
xrep_inode_dir_size(sc);
xrep_inode_extsize(sc);
trace_xrep_inode_fixed(sc);
xfs_trans_log_inode(sc->tp, sc->ip, XFS_ILOG_CORE);
return xrep_roll_trans(sc);
}
/* Repair an inode's fields. */
int
xrep_inode(
struct xfs_scrub *sc)
{
int error = 0;
/*
* No inode? That means we failed the _iget verifiers. Repair all
* the things that the inode verifiers care about, then retry _iget.
*/
if (!sc->ip) {
struct xrep_inode *ri = sc->buf;
ASSERT(ri != NULL);
error = xrep_dinode_problems(ri);
if (error)
return error;
/* By this point we had better have a working incore inode. */
if (!sc->ip)
return -EFSCORRUPTED;
}
xfs_trans_ijoin(sc->tp, sc->ip, 0);
/* If we found corruption of any kind, try to fix it. */
if ((sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) ||
(sc->sm->sm_flags & XFS_SCRUB_OFLAG_XCORRUPT)) {
error = xrep_inode_problems(sc);
if (error)
return error;
}
/* See if we can clear the reflink flag. */
if (xfs_is_reflink_inode(sc->ip)) {
error = xfs_reflink_clear_inode_flag(sc->ip, &sc->tp);
if (error)
return error;
}
return xrep_defer_finish(sc);
}

42
fs/xfs/scrub/repair.c
View File

@ -176,6 +176,16 @@ xrep_roll_ag_trans(
return 0;
}
/* Roll the scrub transaction, holding the primary metadata locked. */
int
xrep_roll_trans(
struct xfs_scrub *sc)
{
if (!sc->ip)
return xrep_roll_ag_trans(sc);
return xfs_trans_roll_inode(&sc->tp, sc->ip);
}
/* Finish all deferred work attached to the repair transaction. */
int
xrep_defer_finish(
@ -740,6 +750,38 @@ xrep_ino_dqattach(
}
#endif /* CONFIG_XFS_QUOTA */
/*
* Ensure that the inode being repaired is ready to handle a certain number of
* extents, or return EFSCORRUPTED. Caller must hold the ILOCK of the inode
* being repaired and have joined it to the scrub transaction.
*/
int
xrep_ino_ensure_extent_count(
struct xfs_scrub *sc,
int whichfork,
xfs_extnum_t nextents)
{
xfs_extnum_t max_extents;
bool inode_has_nrext64;
inode_has_nrext64 = xfs_inode_has_large_extent_counts(sc->ip);
max_extents = xfs_iext_max_nextents(inode_has_nrext64, whichfork);
if (nextents <= max_extents)
return 0;
if (inode_has_nrext64)
return -EFSCORRUPTED;
if (!xfs_has_large_extent_counts(sc->mp))
return -EFSCORRUPTED;
max_extents = xfs_iext_max_nextents(true, whichfork);
if (nextents > max_extents)
return -EFSCORRUPTED;
sc->ip->i_diflags2 |= XFS_DIFLAG2_NREXT64;
xfs_trans_log_inode(sc->tp, sc->ip, XFS_ILOG_CORE);
return 0;
}
/*
* Initialize all the btree cursors for an AG repair except for the btree that
* we're rebuilding.

20
fs/xfs/scrub/repair.h
View File

@ -30,11 +30,22 @@ static inline int xrep_notsupported(struct xfs_scrub *sc)
int xrep_attempt(struct xfs_scrub *sc, struct xchk_stats_run *run);
void xrep_failure(struct xfs_mount *mp);
int xrep_roll_ag_trans(struct xfs_scrub *sc);
int xrep_roll_trans(struct xfs_scrub *sc);
int xrep_defer_finish(struct xfs_scrub *sc);
bool xrep_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
enum xfs_ag_resv_type type);
xfs_extlen_t xrep_calc_ag_resblks(struct xfs_scrub *sc);
static inline int
xrep_trans_commit(
struct xfs_scrub *sc)
{
int error = xfs_trans_commit(sc->tp);
sc->tp = NULL;
return error;
}
struct xbitmap;
struct xagb_bitmap;
@ -66,11 +77,16 @@ int xrep_ino_dqattach(struct xfs_scrub *sc);
# define xrep_ino_dqattach(sc) (0)
#endif /* CONFIG_XFS_QUOTA */
int xrep_ino_ensure_extent_count(struct xfs_scrub *sc, int whichfork,
xfs_extnum_t nextents);
int xrep_reset_perag_resv(struct xfs_scrub *sc);
/* Repair setup functions */
int xrep_setup_ag_allocbt(struct xfs_scrub *sc);
struct xfs_imap;
int xrep_setup_inode(struct xfs_scrub *sc, const struct xfs_imap *imap);
void xrep_ag_btcur_init(struct xfs_scrub *sc, struct xchk_ag *sa);
/* Metadata revalidators */
@ -88,6 +104,7 @@ int xrep_agi(struct xfs_scrub *sc);
int xrep_allocbt(struct xfs_scrub *sc);
int xrep_iallocbt(struct xfs_scrub *sc);
int xrep_refcountbt(struct xfs_scrub *sc);
int xrep_inode(struct xfs_scrub *sc);
int xrep_reinit_pagf(struct xfs_scrub *sc);
int xrep_reinit_pagi(struct xfs_scrub *sc);
@ -133,6 +150,8 @@ xrep_setup_nothing(
}
#define xrep_setup_ag_allocbt xrep_setup_nothing
#define xrep_setup_inode(sc, imap) ((void)0)
#define xrep_revalidate_allocbt (NULL)
#define xrep_revalidate_iallocbt (NULL)
@ -144,6 +163,7 @@ xrep_setup_nothing(
#define xrep_allocbt xrep_notsupported
#define xrep_iallocbt xrep_notsupported
#define xrep_refcountbt xrep_notsupported
#define xrep_inode xrep_notsupported
#endif /* CONFIG_XFS_ONLINE_REPAIR */

2
fs/xfs/scrub/scrub.c
View File

@ -282,7 +282,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
.type = ST_INODE,
.setup = xchk_setup_inode,
.scrub = xchk_inode,
.repair = xrep_notsupported,
.repair = xrep_inode,
},
[XFS_SCRUB_TYPE_BMBTD] = { /* inode data fork */
.type = ST_INODE,

129
fs/xfs/scrub/trace.h
View File

@ -1393,6 +1393,135 @@ DEFINE_NEWBT_EXTENT_EVENT(xrep_newbt_alloc_file_blocks);
DEFINE_NEWBT_EXTENT_EVENT(xrep_newbt_free_blocks);
DEFINE_NEWBT_EXTENT_EVENT(xrep_newbt_claim_block);
DECLARE_EVENT_CLASS(xrep_dinode_class,
TP_PROTO(struct xfs_scrub *sc, struct xfs_dinode *dip),
TP_ARGS(sc, dip),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_ino_t, ino)
__field(uint16_t, mode)
__field(uint8_t, version)
__field(uint8_t, format)
__field(uint32_t, uid)
__field(uint32_t, gid)
__field(uint64_t, size)
__field(uint64_t, nblocks)
__field(uint32_t, extsize)
__field(uint32_t, nextents)
__field(uint16_t, anextents)
__field(uint8_t, forkoff)
__field(uint8_t, aformat)
__field(uint16_t, flags)
__field(uint32_t, gen)
__field(uint64_t, flags2)
__field(uint32_t, cowextsize)
),
TP_fast_assign(
__entry->dev = sc->mp->m_super->s_dev;
__entry->ino = sc->sm->sm_ino;
__entry->mode = be16_to_cpu(dip->di_mode);
__entry->version = dip->di_version;
__entry->format = dip->di_format;
__entry->uid = be32_to_cpu(dip->di_uid);
__entry->gid = be32_to_cpu(dip->di_gid);
__entry->size = be64_to_cpu(dip->di_size);
__entry->nblocks = be64_to_cpu(dip->di_nblocks);
__entry->extsize = be32_to_cpu(dip->di_extsize);
__entry->nextents = be32_to_cpu(dip->di_nextents);
__entry->anextents = be16_to_cpu(dip->di_anextents);
__entry->forkoff = dip->di_forkoff;
__entry->aformat = dip->di_aformat;
__entry->flags = be16_to_cpu(dip->di_flags);
__entry->gen = be32_to_cpu(dip->di_gen);
__entry->flags2 = be64_to_cpu(dip->di_flags2);
__entry->cowextsize = be32_to_cpu(dip->di_cowextsize);
),
TP_printk("dev %d:%d ino 0x%llx mode 0x%x version %u format %u uid %u gid %u disize 0x%llx nblocks 0x%llx extsize %u nextents %u anextents %u forkoff 0x%x aformat %u flags 0x%x gen 0x%x flags2 0x%llx cowextsize %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->ino,
__entry->mode,
__entry->version,
__entry->format,
__entry->uid,
__entry->gid,
__entry->size,
__entry->nblocks,
__entry->extsize,
__entry->nextents,
__entry->anextents,
__entry->forkoff,
__entry->aformat,
__entry->flags,
__entry->gen,
__entry->flags2,
__entry->cowextsize)
)
#define DEFINE_REPAIR_DINODE_EVENT(name) \
DEFINE_EVENT(xrep_dinode_class, name, \
TP_PROTO(struct xfs_scrub *sc, struct xfs_dinode *dip), \
TP_ARGS(sc, dip))
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_header);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_mode);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_flags);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_size);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_extsize_hints);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_zap_symlink);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_zap_dir);
DEFINE_REPAIR_DINODE_EVENT(xrep_dinode_fixed);
DECLARE_EVENT_CLASS(xrep_inode_class,
TP_PROTO(struct xfs_scrub *sc),
TP_ARGS(sc),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_ino_t, ino)
__field(xfs_fsize_t, size)
__field(xfs_rfsblock_t, nblocks)
__field(uint16_t, flags)
__field(uint64_t, flags2)
__field(uint32_t, nextents)
__field(uint8_t, format)
__field(uint32_t, anextents)
__field(uint8_t, aformat)
),
TP_fast_assign(
__entry->dev = sc->mp->m_super->s_dev;
__entry->ino = sc->sm->sm_ino;
__entry->size = sc->ip->i_disk_size;
__entry->nblocks = sc->ip->i_nblocks;
__entry->flags = sc->ip->i_diflags;
__entry->flags2 = sc->ip->i_diflags2;
__entry->nextents = sc->ip->i_df.if_nextents;
__entry->format = sc->ip->i_df.if_format;
__entry->anextents = sc->ip->i_af.if_nextents;
__entry->aformat = sc->ip->i_af.if_format;
),
TP_printk("dev %d:%d ino 0x%llx disize 0x%llx nblocks 0x%llx flags 0x%x flags2 0x%llx nextents %u format %u anextents %u aformat %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->ino,
__entry->size,
__entry->nblocks,
__entry->flags,
__entry->flags2,
__entry->nextents,
__entry->format,
__entry->anextents,
__entry->aformat)
)
#define DEFINE_REPAIR_INODE_EVENT(name) \
DEFINE_EVENT(xrep_inode_class, name, \
TP_PROTO(struct xfs_scrub *sc), \
TP_ARGS(sc))
DEFINE_REPAIR_INODE_EVENT(xrep_inode_blockcounts);
DEFINE_REPAIR_INODE_EVENT(xrep_inode_ids);
DEFINE_REPAIR_INODE_EVENT(xrep_inode_flags);
DEFINE_REPAIR_INODE_EVENT(xrep_inode_blockdir_size);
DEFINE_REPAIR_INODE_EVENT(xrep_inode_sfdir_size);
DEFINE_REPAIR_INODE_EVENT(xrep_inode_dir_size);
DEFINE_REPAIR_INODE_EVENT(xrep_inode_fixed);
#endif /* IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR) */
#endif /* _TRACE_XFS_SCRUB_TRACE_H */