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android-kvm / linux / 10826505f52357c7c9e12358db97a3acbe82e958 / . / fs / xfs / scrub / inode_repair.c
blob: daf9f1ee7c2cbe8e64985d91b1bf3944ff07f6d6 [file] [log] [blame]
// 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_alloc.h"
#include "xfs_rmap.h"
#include "xfs_rmap_btree.h"
#include "xfs_bmap.h"
#include "xfs_bmap_btree.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_attr_leaf.h"
#include "xfs_log_priv.h"
#include "xfs_health.h"
#include "xfs_symlink_remote.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"
#include "scrub/iscan.h"
#include "scrub/readdir.h"
#include "scrub/tempfile.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.
*
* - Data and attr forks are reset to extents format with zero extents if the
* fork data is inconsistent. It is necessary to run the bmapbtd or bmapbta
* repair functions to recover the space mapping.
*
* - ACLs will not be recovered if the attr fork is zapped or the extended
* attribute structure itself requires salvaging.
*
* - If the attr fork is zapped, the user and group ids are reset to root and
* the setuid and setgid bits are removed.
*/
/*
* 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;
/* Blocks in use on the data device by data extents or bmbt blocks. */
xfs_rfsblock_t data_blocks;
/* Blocks in use on the rt device. */
xfs_rfsblock_t rt_blocks;
/* Blocks in use by the attr fork. */
xfs_rfsblock_t attr_blocks;
/* Number of data device extents for the data fork. */
xfs_extnum_t data_extents;
/*
* Number of realtime device extents for the data fork. If
* data_extents and rt_extents indicate that the data fork has extents
* on both devices, we'll just back away slowly.
*/
xfs_extnum_t rt_extents;
/* Number of (data device) extents for the attr fork. */
xfs_aextnum_t attr_extents;
/* Sick state to set after zapping parts of the inode. */
unsigned int ino_sick_mask;
/* Must we remove all access from this file? */
bool zap_acls;
/* Inode scanner to see if we can find the ftype from dirents */
struct xchk_iscan ftype_iscan;
uint8_t alleged_ftype;
};
/*
* 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);
}
/*
* If this directory entry points to the scrub target inode, then the directory
* we're scanning is the parent of the scrub target inode.
*/
STATIC int
xrep_dinode_findmode_dirent(
struct xfs_scrub *sc,
struct xfs_inode *dp,
xfs_dir2_dataptr_t dapos,
const struct xfs_name *name,
xfs_ino_t ino,
void *priv)
{
struct xrep_inode *ri = priv;
int error = 0;
if (xchk_should_terminate(ri->sc, &error))
return error;
if (ino != sc->sm->sm_ino)
return 0;
/* Ignore garbage directory entry names. */
if (name->len == 0 || !xfs_dir2_namecheck(name->name, name->len))
return -EFSCORRUPTED;
/* Don't pick up dot or dotdot entries; we only want child dirents. */
if (xfs_dir2_samename(name, &xfs_name_dotdot) ||
xfs_dir2_samename(name, &xfs_name_dot))
return 0;
/*
* Uhoh, more than one parent for this inode and they don't agree on
* the file type?
*/
if (ri->alleged_ftype != XFS_DIR3_FT_UNKNOWN &&
ri->alleged_ftype != name->type) {
trace_xrep_dinode_findmode_dirent_inval(ri->sc, dp, name->type,
ri->alleged_ftype);
return -EFSCORRUPTED;
}
/* We found a potential parent; remember the ftype. */
trace_xrep_dinode_findmode_dirent(ri->sc, dp, name->type);
ri->alleged_ftype = name->type;
return 0;
}
/* Try to lock a directory, or wait a jiffy. */
static inline int
xrep_dinode_ilock_nowait(
struct xfs_inode *dp,
unsigned int lock_mode)
{
if (xfs_ilock_nowait(dp, lock_mode))
return true;
schedule_timeout_killable(1);
return false;
}
/*
* Try to lock a directory to look for ftype hints. Since we already hold the
* AGI buffer, we cannot block waiting for the ILOCK because rename can take
* the ILOCK and then try to lock AGIs.
*/
STATIC int
xrep_dinode_trylock_directory(
struct xrep_inode *ri,
struct xfs_inode *dp,
unsigned int *lock_modep)
{
unsigned long deadline = jiffies + msecs_to_jiffies(30000);
unsigned int lock_mode;
int error = 0;
do {
if (xchk_should_terminate(ri->sc, &error))
return error;
if (xfs_need_iread_extents(&dp->i_df))
lock_mode = XFS_ILOCK_EXCL;
else
lock_mode = XFS_ILOCK_SHARED;
if (xrep_dinode_ilock_nowait(dp, lock_mode)) {
*lock_modep = lock_mode;
return 0;
}
} while (!time_is_before_jiffies(deadline));
return -EBUSY;
}
/*
* If this is a directory, walk the dirents looking for any that point to the
* scrub target inode.
*/
STATIC int
xrep_dinode_findmode_walk_directory(
struct xrep_inode *ri,
struct xfs_inode *dp)
{
struct xfs_scrub *sc = ri->sc;
unsigned int lock_mode;
int error = 0;
/* Ignore temporary repair directories. */
if (xrep_is_tempfile(dp))
return 0;
/*
* Scan the directory to see if there it contains an entry pointing to
* the directory that we are repairing.
*/
error = xrep_dinode_trylock_directory(ri, dp, &lock_mode);
if (error)
return error;
/*
* If this directory is known to be sick, we cannot scan it reliably
* and must abort.
*/
if (xfs_inode_has_sickness(dp, XFS_SICK_INO_CORE |
XFS_SICK_INO_BMBTD |
XFS_SICK_INO_DIR)) {
error = -EFSCORRUPTED;
goto out_unlock;
}
/*
* We cannot complete our parent pointer scan if a directory looks as
* though it has been zapped by the inode record repair code.
*/
if (xchk_dir_looks_zapped(dp)) {
error = -EBUSY;
goto out_unlock;
}
error = xchk_dir_walk(sc, dp, xrep_dinode_findmode_dirent, ri);
if (error)
goto out_unlock;
out_unlock:
xfs_iunlock(dp, lock_mode);
return error;
}
/*
* Try to find the mode of the inode being repaired by looking for directories
* that point down to this file.
*/
STATIC int
xrep_dinode_find_mode(
struct xrep_inode *ri,
uint16_t *mode)
{
struct xfs_scrub *sc = ri->sc;
struct xfs_inode *dp;
int error;
/* No ftype means we have no other metadata to consult. */
if (!xfs_has_ftype(sc->mp)) {
*mode = S_IFREG;
return 0;
}
/*
* Scan all directories for parents that might point down to this
* inode. Skip the inode being repaired during the scan since it
* cannot be its own parent. Note that we still hold the AGI locked
* so there's a real possibility that _iscan_iter can return EBUSY.
*/
xchk_iscan_start(sc, 5000, 100, &ri->ftype_iscan);
xchk_iscan_set_agi_trylock(&ri->ftype_iscan);
ri->ftype_iscan.skip_ino = sc->sm->sm_ino;
ri->alleged_ftype = XFS_DIR3_FT_UNKNOWN;
while ((error = xchk_iscan_iter(&ri->ftype_iscan, &dp)) == 1) {
if (S_ISDIR(VFS_I(dp)->i_mode))
error = xrep_dinode_findmode_walk_directory(ri, dp);
xchk_iscan_mark_visited(&ri->ftype_iscan, dp);
xchk_irele(sc, dp);
if (error < 0)
break;
if (xchk_should_terminate(sc, &error))
break;
}
xchk_iscan_iter_finish(&ri->ftype_iscan);
xchk_iscan_teardown(&ri->ftype_iscan);
if (error == -EBUSY) {
if (ri->alleged_ftype != XFS_DIR3_FT_UNKNOWN) {
/*
* If we got an EBUSY after finding at least one
* dirent, that means the scan found an inode on the
* inactivation list and could not open it. Accept the
* alleged ftype and install a new mode below.
*/
error = 0;
} else if (!(sc->flags & XCHK_TRY_HARDER)) {
/*
* Otherwise, retry the operation one time to see if
* the reason for the delay is an inode from the same
* cluster buffer waiting on the inactivation list.
*/
error = -EDEADLOCK;
}
}
if (error)
return error;
/*
* Convert the discovered ftype into the file mode. If all else fails,
* return S_IFREG.
*/
switch (ri->alleged_ftype) {
case XFS_DIR3_FT_DIR:
*mode = S_IFDIR;
break;
case XFS_DIR3_FT_WHT:
case XFS_DIR3_FT_CHRDEV:
*mode = S_IFCHR;
break;
case XFS_DIR3_FT_BLKDEV:
*mode = S_IFBLK;
break;
case XFS_DIR3_FT_FIFO:
*mode = S_IFIFO;
break;
case XFS_DIR3_FT_SOCK:
*mode = S_IFSOCK;
break;
case XFS_DIR3_FT_SYMLINK:
*mode = S_IFLNK;
break;
default:
*mode = S_IFREG;
break;
}
return 0;
}
/* Turn di_mode into /something/ recognizable. Returns true if we succeed. */
STATIC int
xrep_dinode_mode(
struct xrep_inode *ri,
struct xfs_dinode *dip)
{
struct xfs_scrub *sc = ri->sc;
uint16_t mode = be16_to_cpu(dip->di_mode);
int error;
trace_xrep_dinode_mode(sc, dip);
if (mode == 0 || xfs_mode_to_ftype(mode) != XFS_DIR3_FT_UNKNOWN)
return 0;
/* Try to fix the mode. If we cannot, then leave everything alone. */
error = xrep_dinode_find_mode(ri, &mode);
switch (error) {
case -EINTR:
case -EBUSY:
case -EDEADLOCK:
/* temporary failure or fatal signal */
return error;
case 0:
/* found mode */
break;
default:
/* some other error, assume S_IFREG */
mode = S_IFREG;
break;
}
/* bad mode, so we set it to a file that only root can read */
dip->di_mode = cpu_to_be16(mode);
dip->di_uid = 0;
dip->di_gid = 0;
ri->zap_acls = true;
return 0;
}
/* Fix unused link count fields having nonzero values. */
STATIC void
xrep_dinode_nlinks(
struct xfs_dinode *dip)
{
if (dip->di_version > 1)
dip->di_onlink = 0;
else
dip->di_nlink = 0;
}
/* Fix any conflicting flags that the verifiers complain about. */
STATIC void
xrep_dinode_flags(
struct xfs_scrub *sc,
struct xfs_dinode *dip,
bool isrt)
{
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);
if (isrt)
flags |= XFS_DIFLAG_REALTIME;
else
flags &= ~XFS_DIFLAG_REALTIME;
/*
* 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);
}
}
/* Count extents and blocks for an inode given an rmap. */
STATIC int
xrep_dinode_walk_rmap(
struct xfs_btree_cur *cur,
const struct xfs_rmap_irec *rec,
void *priv)
{
struct xrep_inode *ri = priv;
int error = 0;
if (xchk_should_terminate(ri->sc, &error))
return error;
/* We only care about this inode. */
if (rec->rm_owner != ri->sc->sm->sm_ino)
return 0;
if (rec->rm_flags & XFS_RMAP_ATTR_FORK) {
ri->attr_blocks += rec->rm_blockcount;
if (!(rec->rm_flags & XFS_RMAP_BMBT_BLOCK))
ri->attr_extents++;
return 0;
}
ri->data_blocks += rec->rm_blockcount;
if (!(rec->rm_flags & XFS_RMAP_BMBT_BLOCK))
ri->data_extents++;
return 0;
}
/* Count extents and blocks for an inode from all AG rmap data. */
STATIC int
xrep_dinode_count_ag_rmaps(
struct xrep_inode *ri,
struct xfs_perag *pag)
{
struct xfs_btree_cur *cur;
struct xfs_buf *agf;
int error;
error = xfs_alloc_read_agf(pag, ri->sc->tp, 0, &agf);
if (error)
return error;
cur = xfs_rmapbt_init_cursor(ri->sc->mp, ri->sc->tp, agf, pag);
error = xfs_rmap_query_all(cur, xrep_dinode_walk_rmap, ri);
xfs_btree_del_cursor(cur, error);
xfs_trans_brelse(ri->sc->tp, agf);
return error;
}
/* Count extents and blocks for a given inode from all rmap data. */
STATIC int
xrep_dinode_count_rmaps(
struct xrep_inode *ri)
{
struct xfs_perag *pag;
xfs_agnumber_t agno;
int error;
if (!xfs_has_rmapbt(ri->sc->mp) || xfs_has_realtime(ri->sc->mp))
return -EOPNOTSUPP;
for_each_perag(ri->sc->mp, agno, pag) {
error = xrep_dinode_count_ag_rmaps(ri, pag);
if (error) {
xfs_perag_rele(pag);
return error;
}
}
/* Can't have extents on both the rt and the data device. */
if (ri->data_extents && ri->rt_extents)
return -EFSCORRUPTED;
trace_xrep_dinode_count_rmaps(ri->sc,
ri->data_blocks, ri->rt_blocks, ri->attr_blocks,
ri->data_extents, ri->rt_extents, ri->attr_extents);
return 0;
}
/* Return true if this extents-format ifork looks like garbage. */
STATIC bool
xrep_dinode_bad_extents_fork(
struct xfs_scrub *sc,
struct xfs_dinode *dip,
unsigned int dfork_size,
int whichfork)
{
struct xfs_bmbt_irec new;
struct xfs_bmbt_rec *dp;
xfs_extnum_t nex;
bool isrt;
unsigned int i;
nex = xfs_dfork_nextents(dip, whichfork);
if (nex > dfork_size / sizeof(struct xfs_bmbt_rec))
return true;
dp = XFS_DFORK_PTR(dip, whichfork);
isrt = dip->di_flags & cpu_to_be16(XFS_DIFLAG_REALTIME);
for (i = 0; i < nex; i++, dp++) {
xfs_failaddr_t fa;
xfs_bmbt_disk_get_all(dp, &new);
fa = xfs_bmap_validate_extent_raw(sc->mp, isrt, whichfork,
&new);
if (fa)
return true;
}
return false;
}
/* Return true if this btree-format ifork looks like garbage. */
STATIC bool
xrep_dinode_bad_bmbt_fork(
struct xfs_scrub *sc,
struct xfs_dinode *dip,
unsigned int dfork_size,
int whichfork)
{
struct xfs_bmdr_block *dfp;
xfs_extnum_t nex;
unsigned int i;
unsigned int dmxr;
unsigned int nrecs;
unsigned int level;
nex = xfs_dfork_nextents(dip, whichfork);
if (nex <= dfork_size / sizeof(struct xfs_bmbt_rec))
return true;
if (dfork_size < sizeof(struct xfs_bmdr_block))
return true;
dfp = XFS_DFORK_PTR(dip, whichfork);
nrecs = be16_to_cpu(dfp->bb_numrecs);
level = be16_to_cpu(dfp->bb_level);
if (nrecs == 0 || XFS_BMDR_SPACE_CALC(nrecs) > dfork_size)
return true;
if (level == 0 || level >= XFS_BM_MAXLEVELS(sc->mp, whichfork))
return true;
dmxr = xfs_bmdr_maxrecs(dfork_size, 0);
for (i = 1; i <= nrecs; i++) {
struct xfs_bmbt_key *fkp;
xfs_bmbt_ptr_t *fpp;
xfs_fileoff_t fileoff;
xfs_fsblock_t fsbno;
fkp = XFS_BMDR_KEY_ADDR(dfp, i);
fileoff = be64_to_cpu(fkp->br_startoff);
if (!xfs_verify_fileoff(sc->mp, fileoff))
return true;
fpp = XFS_BMDR_PTR_ADDR(dfp, i, dmxr);
fsbno = be64_to_cpu(*fpp);
if (!xfs_verify_fsbno(sc->mp, fsbno))
return true;
}
return false;
}
/*
* Check the data fork for things that will fail the ifork verifiers or the
* ifork formatters.
*/
STATIC bool
xrep_dinode_check_dfork(
struct xfs_scrub *sc,
struct xfs_dinode *dip,
uint16_t mode)
{
void *dfork_ptr;
int64_t data_size;
unsigned int fmt;
unsigned int dfork_size;
/*
* Verifier functions take signed int64_t, so check for bogus negative
* values first.
*/
data_size = be64_to_cpu(dip->di_size);
if (data_size < 0)
return true;
fmt = XFS_DFORK_FORMAT(dip, XFS_DATA_FORK);
switch (mode & S_IFMT) {
case S_IFIFO:
case S_IFCHR:
case S_IFBLK:
case S_IFSOCK:
if (fmt != XFS_DINODE_FMT_DEV)
return true;
break;
case S_IFREG:
if (fmt == XFS_DINODE_FMT_LOCAL)
return true;
fallthrough;
case S_IFLNK:
case S_IFDIR:
switch (fmt) {
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
break;
default:
return true;
}
break;
default:
return true;
}
dfork_size = XFS_DFORK_SIZE(dip, sc->mp, XFS_DATA_FORK);
dfork_ptr = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
switch (fmt) {
case XFS_DINODE_FMT_DEV:
break;
case XFS_DINODE_FMT_LOCAL:
/* dir/symlink structure cannot be larger than the fork */
if (data_size > dfork_size)
return true;
/* directory structure must pass verification. */
if (S_ISDIR(mode) &&
xfs_dir2_sf_verify(sc->mp, dfork_ptr, data_size) != NULL)
return true;
/* symlink structure must pass verification. */
if (S_ISLNK(mode) &&
xfs_symlink_shortform_verify(dfork_ptr, data_size) != NULL)
return true;
break;
case XFS_DINODE_FMT_EXTENTS:
if (xrep_dinode_bad_extents_fork(sc, dip, dfork_size,
XFS_DATA_FORK))
return true;
break;
case XFS_DINODE_FMT_BTREE:
if (xrep_dinode_bad_bmbt_fork(sc, dip, dfork_size,
XFS_DATA_FORK))
return true;
break;
default:
return true;
}
return false;
}
static void
xrep_dinode_set_data_nextents(
struct xfs_dinode *dip,
xfs_extnum_t nextents)
{
if (xfs_dinode_has_large_extent_counts(dip))
dip->di_big_nextents = cpu_to_be64(nextents);
else
dip->di_nextents = cpu_to_be32(nextents);
}
static void
xrep_dinode_set_attr_nextents(
struct xfs_dinode *dip,
xfs_extnum_t nextents)
{
if (xfs_dinode_has_large_extent_counts(dip))
dip->di_big_anextents = cpu_to_be32(nextents);
else
dip->di_anextents = cpu_to_be16(nextents);
}
/* Reset the data fork to something sane. */
STATIC void
xrep_dinode_zap_dfork(
struct xrep_inode *ri,
struct xfs_dinode *dip,
uint16_t mode)
{
struct xfs_scrub *sc = ri->sc;
trace_xrep_dinode_zap_dfork(sc, dip);
ri->ino_sick_mask |= XFS_SICK_INO_BMBTD_ZAPPED;
xrep_dinode_set_data_nextents(dip, 0);
ri->data_blocks = 0;
ri->rt_blocks = 0;
/* Special files always get reset to DEV */
switch (mode & S_IFMT) {
case S_IFIFO:
case S_IFCHR:
case S_IFBLK:
case S_IFSOCK:
dip->di_format = XFS_DINODE_FMT_DEV;
dip->di_size = 0;
return;
}
/*
* If we have data extents, reset to an empty map and hope the user
* will run the bmapbtd checker next.
*/
if (ri->data_extents || ri->rt_extents || S_ISREG(mode)) {
dip->di_format = XFS_DINODE_FMT_EXTENTS;
return;
}
/* Otherwise, reset the local format to the minimum. */
switch (mode & S_IFMT) {
case S_IFLNK:
xrep_dinode_zap_symlink(ri, dip);
break;
case S_IFDIR:
xrep_dinode_zap_dir(ri, dip);
break;
}
}
/*
* Check the attr fork for things that will fail the ifork verifiers or the
* ifork formatters.
*/
STATIC bool
xrep_dinode_check_afork(
struct xfs_scrub *sc,
struct xfs_dinode *dip)
{
struct xfs_attr_sf_hdr *afork_ptr;
size_t attr_size;
unsigned int afork_size;
if (XFS_DFORK_BOFF(dip) == 0)
return dip->di_aformat != XFS_DINODE_FMT_EXTENTS ||
xfs_dfork_attr_extents(dip) != 0;
afork_size = XFS_DFORK_SIZE(dip, sc->mp, XFS_ATTR_FORK);
afork_ptr = XFS_DFORK_PTR(dip, XFS_ATTR_FORK);
switch (XFS_DFORK_FORMAT(dip, XFS_ATTR_FORK)) {
case XFS_DINODE_FMT_LOCAL:
/* Fork has to be large enough to extract the xattr size. */
if (afork_size < sizeof(struct xfs_attr_sf_hdr))
return true;
/* xattr structure cannot be larger than the fork */
attr_size = be16_to_cpu(afork_ptr->totsize);
if (attr_size > afork_size)
return true;
/* xattr structure must pass verification. */
return xfs_attr_shortform_verify(afork_ptr, attr_size) != NULL;
case XFS_DINODE_FMT_EXTENTS:
if (xrep_dinode_bad_extents_fork(sc, dip, afork_size,
XFS_ATTR_FORK))
return true;
break;
case XFS_DINODE_FMT_BTREE:
if (xrep_dinode_bad_bmbt_fork(sc, dip, afork_size,
XFS_ATTR_FORK))
return true;
break;
default:
return true;
}
return false;
}
/*
* Reset the attr fork to empty. Since the attr fork could have contained
* ACLs, make the file readable only by root.
*/
STATIC void
xrep_dinode_zap_afork(
struct xrep_inode *ri,
struct xfs_dinode *dip,
uint16_t mode)
{
struct xfs_scrub *sc = ri->sc;
trace_xrep_dinode_zap_afork(sc, dip);
ri->ino_sick_mask |= XFS_SICK_INO_BMBTA_ZAPPED;
dip->di_aformat = XFS_DINODE_FMT_EXTENTS;
xrep_dinode_set_attr_nextents(dip, 0);
ri->attr_blocks = 0;
/*
* If the data fork is in btree format, removing the attr fork entirely
* might cause verifier failures if the next level down in the bmbt
* could now fit in the data fork area.
*/
if (dip->di_format != XFS_DINODE_FMT_BTREE)
dip->di_forkoff = 0;
dip->di_mode = cpu_to_be16(mode & ~0777);
dip->di_uid = 0;
dip->di_gid = 0;
}
/* Make sure the fork offset is a sensible value. */
STATIC void
xrep_dinode_ensure_forkoff(
struct xrep_inode *ri,
struct xfs_dinode *dip,
uint16_t mode)
{
struct xfs_bmdr_block *bmdr;
struct xfs_scrub *sc = ri->sc;
xfs_extnum_t attr_extents, data_extents;
size_t bmdr_minsz = XFS_BMDR_SPACE_CALC(1);
unsigned int lit_sz = XFS_LITINO(sc->mp);
unsigned int afork_min, dfork_min;
trace_xrep_dinode_ensure_forkoff(sc, dip);
/*
* Before calling this function, xrep_dinode_core ensured that both
* forks actually fit inside their respective literal areas. If this
* was not the case, the fork was reset to FMT_EXTENTS with zero
* records. If the rmapbt scan found attr or data fork blocks, this
* will be noted in the dinode_stats, and we must leave enough room
* for the bmap repair code to reconstruct the mapping structure.
*
* First, compute the minimum space required for the attr fork.
*/
switch (dip->di_aformat) {
case XFS_DINODE_FMT_LOCAL:
/*
* If we still have a shortform xattr structure at all, that
* means the attr fork area was exactly large enough to fit
* the sf structure.
*/
afork_min = XFS_DFORK_SIZE(dip, sc->mp, XFS_ATTR_FORK);
break;
case XFS_DINODE_FMT_EXTENTS:
attr_extents = xfs_dfork_attr_extents(dip);
if (attr_extents) {
/*
* We must maintain sufficient space to hold the entire
* extent map array in the data fork. Note that we
* previously zapped the fork if it had no chance of
* fitting in the inode.
*/
afork_min = sizeof(struct xfs_bmbt_rec) * attr_extents;
} else if (ri->attr_extents > 0) {
/*
* The attr fork thinks it has zero extents, but we
* found some xattr extents. We need to leave enough
* empty space here so that the incore attr fork will
* get created (and hence trigger the attr fork bmap
* repairer).
*/
afork_min = bmdr_minsz;
} else {
/* No extents on disk or found in rmapbt. */
afork_min = 0;
}
break;
case XFS_DINODE_FMT_BTREE:
/* Must have space for btree header and key/pointers. */
bmdr = XFS_DFORK_PTR(dip, XFS_ATTR_FORK);
afork_min = XFS_BMAP_BROOT_SPACE(sc->mp, bmdr);
break;
default:
/* We should never see any other formats. */
afork_min = 0;
break;
}
/* Compute the minimum space required for the data fork. */
switch (dip->di_format) {
case XFS_DINODE_FMT_DEV:
dfork_min = sizeof(__be32);
break;
case XFS_DINODE_FMT_UUID:
dfork_min = sizeof(uuid_t);
break;
case XFS_DINODE_FMT_LOCAL:
/*
* If we still have a shortform data fork at all, that means
* the data fork area was large enough to fit whatever was in
* there.
*/
dfork_min = be64_to_cpu(dip->di_size);
break;
case XFS_DINODE_FMT_EXTENTS:
data_extents = xfs_dfork_data_extents(dip);
if (data_extents) {
/*
* We must maintain sufficient space to hold the entire
* extent map array in the data fork. Note that we
* previously zapped the fork if it had no chance of
* fitting in the inode.
*/
dfork_min = sizeof(struct xfs_bmbt_rec) * data_extents;
} else if (ri->data_extents > 0 || ri->rt_extents > 0) {
/*
* The data fork thinks it has zero extents, but we
* found some data extents. We need to leave enough
* empty space here so that the data fork bmap repair
* will recover the mappings.
*/
dfork_min = bmdr_minsz;
} else {
/* No extents on disk or found in rmapbt. */
dfork_min = 0;
}
break;
case XFS_DINODE_FMT_BTREE:
/* Must have space for btree header and key/pointers. */
bmdr = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
dfork_min = XFS_BMAP_BROOT_SPACE(sc->mp, bmdr);
break;
default:
dfork_min = 0;
break;
}
/*
* Round all values up to the nearest 8 bytes, because that is the
* precision of di_forkoff.
*/
afork_min = roundup(afork_min, 8);
dfork_min = roundup(dfork_min, 8);
bmdr_minsz = roundup(bmdr_minsz, 8);
ASSERT(dfork_min <= lit_sz);
ASSERT(afork_min <= lit_sz);
/*
* If the data fork was zapped and we don't have enough space for the
* recovery fork, move the attr fork up.
*/
if (dip->di_format == XFS_DINODE_FMT_EXTENTS &&
xfs_dfork_data_extents(dip) == 0 &&
(ri->data_extents > 0 || ri->rt_extents > 0) &&
bmdr_minsz > XFS_DFORK_DSIZE(dip, sc->mp)) {
if (bmdr_minsz + afork_min > lit_sz) {
/*
* The attr for and the stub fork we need to recover
* the data fork won't both fit. Zap the attr fork.
*/
xrep_dinode_zap_afork(ri, dip, mode);
afork_min = bmdr_minsz;
} else {
void *before, *after;
/* Otherwise, just slide the attr fork up. */
before = XFS_DFORK_APTR(dip);
dip->di_forkoff = bmdr_minsz >> 3;
after = XFS_DFORK_APTR(dip);
memmove(after, before, XFS_DFORK_ASIZE(dip, sc->mp));
}
}
/*
* If the attr fork was zapped and we don't have enough space for the
* recovery fork, move the attr fork down.
*/
if (dip->di_aformat == XFS_DINODE_FMT_EXTENTS &&
xfs_dfork_attr_extents(dip) == 0 &&
ri->attr_extents > 0 &&
bmdr_minsz > XFS_DFORK_ASIZE(dip, sc->mp)) {
if (dip->di_format == XFS_DINODE_FMT_BTREE) {
/*
* If the data fork is in btree format then we can't
* adjust forkoff because that runs the risk of
* violating the extents/btree format transition rules.
*/
} else if (bmdr_minsz + dfork_min > lit_sz) {
/*
* If we can't move the attr fork, too bad, we lose the
* attr fork and leak its blocks.
*/
xrep_dinode_zap_afork(ri, dip, mode);
} else {
/*
* Otherwise, just slide the attr fork down. The attr
* fork is empty, so we don't have any old contents to
* move here.
*/
dip->di_forkoff = (lit_sz - bmdr_minsz) >> 3;
}
}
}
/*
* Zap the data/attr forks if we spot anything that isn't going to pass the
* ifork verifiers or the ifork formatters, because we need to get the inode
* into good enough shape that the higher level repair functions can run.
*/
STATIC void
xrep_dinode_zap_forks(
struct xrep_inode *ri,
struct xfs_dinode *dip)
{
struct xfs_scrub *sc = ri->sc;
xfs_extnum_t data_extents;
xfs_extnum_t attr_extents;
xfs_filblks_t nblocks;
uint16_t mode;
bool zap_datafork = false;
bool zap_attrfork = ri->zap_acls;
trace_xrep_dinode_zap_forks(sc, dip);
mode = be16_to_cpu(dip->di_mode);
data_extents = xfs_dfork_data_extents(dip);
attr_extents = xfs_dfork_attr_extents(dip);
nblocks = be64_to_cpu(dip->di_nblocks);
/* Inode counters don't make sense? */
if (data_extents > nblocks)
zap_datafork = true;
if (attr_extents > nblocks)
zap_attrfork = true;
if (data_extents + attr_extents > nblocks)
zap_datafork = zap_attrfork = true;
if (!zap_datafork)
zap_datafork = xrep_dinode_check_dfork(sc, dip, mode);
if (!zap_attrfork)
zap_attrfork = xrep_dinode_check_afork(sc, dip);
/* Zap whatever's bad. */
if (zap_attrfork)
xrep_dinode_zap_afork(ri, dip, mode);
if (zap_datafork)
xrep_dinode_zap_dfork(ri, dip, mode);
xrep_dinode_ensure_forkoff(ri, dip, mode);
/*
* Zero di_nblocks if we don't have any extents at all to satisfy the
* buffer verifier.
*/
data_extents = xfs_dfork_data_extents(dip);
attr_extents = xfs_dfork_attr_extents(dip);
if (data_extents + attr_extents == 0)
dip->di_nblocks = 0;
}
/* 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;
/* Figure out what this inode had mapped in both forks. */
error = xrep_dinode_count_rmaps(ri);
if (error)
return 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);
iget_error = xrep_dinode_mode(ri, dip);
if (iget_error)
goto write;
xrep_dinode_nlinks(dip);
xrep_dinode_flags(sc, dip, ri->rt_extents > 0);
xrep_dinode_size(ri, dip);
xrep_dinode_extsize_hints(sc, dip);
xrep_dinode_zap_forks(ri, dip);
write:
/* 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.
*/
if (!iget_error)
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;
}
}
/* Ensure this file has an attr fork if it needs to hold a parent pointer. */
STATIC int
xrep_inode_pptr(
struct xfs_scrub *sc)
{
struct xfs_mount *mp = sc->mp;
struct xfs_inode *ip = sc->ip;
struct inode *inode = VFS_I(ip);
if (!xfs_has_parent(mp))
return 0;
/*
* Unlinked inodes that cannot be added to the directory tree will not
* have a parent pointer.
*/
if (inode->i_nlink == 0 && !(inode->i_state & I_LINKABLE))
return 0;
/* The root directory doesn't have a parent pointer. */
if (ip == mp->m_rootip)
return 0;
/*
* Metadata inodes are rooted in the superblock and do not have any
* parents.
*/
if (xfs_is_metadata_inode(ip))
return 0;
/* Inode already has an attr fork; no further work possible here. */
if (xfs_inode_has_attr_fork(ip))
return 0;
return xfs_bmap_add_attrfork(sc->tp, ip,
sizeof(struct xfs_attr_sf_hdr), true);
}
/* 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;
error = xrep_inode_pptr(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);
}
/*
* Make sure this inode's unlinked list pointers are consistent with its
* link count.
*/
STATIC int
xrep_inode_unlinked(
struct xfs_scrub *sc)
{
unsigned int nlink = VFS_I(sc->ip)->i_nlink;
int error;
/*
* If this inode is linked from the directory tree and on the unlinked
* list, remove it from the unlinked list.
*/
if (nlink > 0 && xfs_inode_on_unlinked_list(sc->ip)) {
struct xfs_perag *pag;
int error;
pag = xfs_perag_get(sc->mp,
XFS_INO_TO_AGNO(sc->mp, sc->ip->i_ino));
error = xfs_iunlink_remove(sc->tp, pag, sc->ip);
xfs_perag_put(pag);
if (error)
return error;
}
/*
* If this inode is not linked from the directory tree yet not on the
* unlinked list, put it on the unlinked list.
*/
if (nlink == 0 && !xfs_inode_on_unlinked_list(sc->ip)) {
error = xfs_iunlink(sc->tp, sc->ip);
if (error)
return error;
}
return 0;
}
/* 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 == -EBUSY) {
/*
* Directory scan to recover inode mode encountered a
* busy inode, so we did not continue repairing things.
*/
return 0;
}
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;
}
/* Reconnect incore unlinked list */
error = xrep_inode_unlinked(sc);
if (error)
return error;
return xrep_defer_finish(sc);
}