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38bb131084
xchk_get_inode is not quite the right function to be calling from the
inode scrubber setup function. The common get_inode function either
gets an inode and installs it in the scrub context, or it returns an
error code explaining what happened. This is acceptable for most file
scrubbers because it is not in their scope to fix corruptions in the
inode core and fork areas that cause iget to fail.
Dealing with these problems is within the scope of the inode scrubber,
however. If iget fails with EFSCORRUPTED, we need to xchk_inode to flag
that as corruption. Since we can't get our hands on an incore inode, we
need to hold the AGI to prevent inode allocation activity so that
nothing changes in the inode metadata.
Looking ahead to the inode core repair patches, we will also need to
hold the AGI buffer into xrep_inode so that we can make modifications to
the xfs_dinode structure without any other thread swooping in to
allocate or free the inode.
Adapt the xchk_get_inode into xchk_setup_inode since this is a one-off
use case where the error codes we check for are a little different, and
the return state is much different from the common function.
xchk_setup_inode prepares to check or repair an inode record, so it must
continue the scrub operation even if the inode/inobt verifiers cause
xfs_iget to return EFSCORRUPTED. This is done by attaching the locked
AGI buffer to the scrub transaction and returning 0 to move on to the
actual scrub. (Later, the online inode repair code will also want the
xfs_imap structure so that it can reset the ondisk xfs_dinode
structure.)
xchk_get_inode retrieves an inode on behalf of a scrubber that operates
on an incore inode -- data/attr/cow forks, directories, xattrs,
symlinks, parent pointers, etc. If the inode/inobt verifiers fail and
xfs_iget returns EFSCORRUPTED, we want to exit to userspace (because the
caller should be fix the inode first) and drop everything we acquired
along the way.
A behavior common to both functions is that it's possible that xfs_scrub
asked for a scrub-by-handle concurrent with the inode being freed or the
passed-in inumber is invalid. In this case, we call xfs_imap to see if
the inobt index thinks the inode is allocated, and return ENOENT
("nothing to check here") to userspace if this is not the case. The
imap lookup is why both functions call xchk_iget_agi.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
177 lines
5.8 KiB
C
177 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2017-2023 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <djwong@kernel.org>
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*/
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#ifndef __XFS_SCRUB_COMMON_H__
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#define __XFS_SCRUB_COMMON_H__
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/*
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* We /could/ terminate a scrub/repair operation early. If we're not
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* in a good place to continue (fatal signal, etc.) then bail out.
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* Note that we're careful not to make any judgements about *error.
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*/
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static inline bool
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xchk_should_terminate(
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struct xfs_scrub *sc,
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int *error)
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{
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/*
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* If preemption is disabled, we need to yield to the scheduler every
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* few seconds so that we don't run afoul of the soft lockup watchdog
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* or RCU stall detector.
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*/
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cond_resched();
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if (fatal_signal_pending(current)) {
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if (*error == 0)
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*error = -EINTR;
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return true;
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}
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return false;
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}
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int xchk_trans_alloc(struct xfs_scrub *sc, uint resblks);
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void xchk_trans_cancel(struct xfs_scrub *sc);
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bool xchk_process_error(struct xfs_scrub *sc, xfs_agnumber_t agno,
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xfs_agblock_t bno, int *error);
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bool xchk_fblock_process_error(struct xfs_scrub *sc, int whichfork,
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xfs_fileoff_t offset, int *error);
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bool xchk_xref_process_error(struct xfs_scrub *sc,
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xfs_agnumber_t agno, xfs_agblock_t bno, int *error);
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bool xchk_fblock_xref_process_error(struct xfs_scrub *sc,
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int whichfork, xfs_fileoff_t offset, int *error);
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void xchk_block_set_preen(struct xfs_scrub *sc,
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struct xfs_buf *bp);
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void xchk_ino_set_preen(struct xfs_scrub *sc, xfs_ino_t ino);
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void xchk_set_corrupt(struct xfs_scrub *sc);
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void xchk_block_set_corrupt(struct xfs_scrub *sc,
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struct xfs_buf *bp);
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void xchk_ino_set_corrupt(struct xfs_scrub *sc, xfs_ino_t ino);
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void xchk_fblock_set_corrupt(struct xfs_scrub *sc, int whichfork,
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xfs_fileoff_t offset);
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void xchk_block_xref_set_corrupt(struct xfs_scrub *sc,
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struct xfs_buf *bp);
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void xchk_ino_xref_set_corrupt(struct xfs_scrub *sc,
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xfs_ino_t ino);
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void xchk_fblock_xref_set_corrupt(struct xfs_scrub *sc,
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int whichfork, xfs_fileoff_t offset);
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void xchk_ino_set_warning(struct xfs_scrub *sc, xfs_ino_t ino);
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void xchk_fblock_set_warning(struct xfs_scrub *sc, int whichfork,
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xfs_fileoff_t offset);
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void xchk_set_incomplete(struct xfs_scrub *sc);
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int xchk_checkpoint_log(struct xfs_mount *mp);
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/* Are we set up for a cross-referencing check? */
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bool xchk_should_check_xref(struct xfs_scrub *sc, int *error,
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struct xfs_btree_cur **curpp);
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/* Setup functions */
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int xchk_setup_agheader(struct xfs_scrub *sc);
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int xchk_setup_fs(struct xfs_scrub *sc);
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int xchk_setup_ag_allocbt(struct xfs_scrub *sc);
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int xchk_setup_ag_iallocbt(struct xfs_scrub *sc);
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int xchk_setup_ag_rmapbt(struct xfs_scrub *sc);
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int xchk_setup_ag_refcountbt(struct xfs_scrub *sc);
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int xchk_setup_inode(struct xfs_scrub *sc);
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int xchk_setup_inode_bmap(struct xfs_scrub *sc);
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int xchk_setup_inode_bmap_data(struct xfs_scrub *sc);
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int xchk_setup_directory(struct xfs_scrub *sc);
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int xchk_setup_xattr(struct xfs_scrub *sc);
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int xchk_setup_symlink(struct xfs_scrub *sc);
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int xchk_setup_parent(struct xfs_scrub *sc);
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#ifdef CONFIG_XFS_RT
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int xchk_setup_rt(struct xfs_scrub *sc);
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#else
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static inline int
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xchk_setup_rt(struct xfs_scrub *sc)
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{
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return -ENOENT;
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}
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#endif
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#ifdef CONFIG_XFS_QUOTA
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int xchk_setup_quota(struct xfs_scrub *sc);
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#else
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static inline int
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xchk_setup_quota(struct xfs_scrub *sc)
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{
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return -ENOENT;
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}
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#endif
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int xchk_setup_fscounters(struct xfs_scrub *sc);
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void xchk_ag_free(struct xfs_scrub *sc, struct xchk_ag *sa);
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int xchk_ag_init(struct xfs_scrub *sc, xfs_agnumber_t agno,
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struct xchk_ag *sa);
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/*
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* Grab all AG resources, treating the inability to grab the perag structure as
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* a fs corruption. This is intended for callers checking an ondisk reference
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* to a given AG, which means that the AG must still exist.
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*/
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static inline int
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xchk_ag_init_existing(
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struct xfs_scrub *sc,
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xfs_agnumber_t agno,
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struct xchk_ag *sa)
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{
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int error = xchk_ag_init(sc, agno, sa);
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return error == -ENOENT ? -EFSCORRUPTED : error;
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}
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int xchk_ag_read_headers(struct xfs_scrub *sc, xfs_agnumber_t agno,
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struct xchk_ag *sa);
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void xchk_ag_btcur_free(struct xchk_ag *sa);
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void xchk_ag_btcur_init(struct xfs_scrub *sc, struct xchk_ag *sa);
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int xchk_count_rmap_ownedby_ag(struct xfs_scrub *sc, struct xfs_btree_cur *cur,
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const struct xfs_owner_info *oinfo, xfs_filblks_t *blocks);
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int xchk_setup_ag_btree(struct xfs_scrub *sc, bool force_log);
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int xchk_iget_for_scrubbing(struct xfs_scrub *sc);
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int xchk_setup_inode_contents(struct xfs_scrub *sc, unsigned int resblks);
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void xchk_buffer_recheck(struct xfs_scrub *sc, struct xfs_buf *bp);
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int xchk_iget(struct xfs_scrub *sc, xfs_ino_t inum, struct xfs_inode **ipp);
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int xchk_iget_agi(struct xfs_scrub *sc, xfs_ino_t inum,
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struct xfs_buf **agi_bpp, struct xfs_inode **ipp);
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void xchk_irele(struct xfs_scrub *sc, struct xfs_inode *ip);
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int xchk_install_handle_inode(struct xfs_scrub *sc, struct xfs_inode *ip);
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/*
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* Don't bother cross-referencing if we already found corruption or cross
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* referencing discrepancies.
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*/
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static inline bool xchk_skip_xref(struct xfs_scrub_metadata *sm)
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{
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return sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
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XFS_SCRUB_OFLAG_XCORRUPT);
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}
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int xchk_metadata_inode_forks(struct xfs_scrub *sc);
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void xchk_stop_reaping(struct xfs_scrub *sc);
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void xchk_start_reaping(struct xfs_scrub *sc);
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/*
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* Setting up a hook to wait for intents to drain is costly -- we have to take
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* the CPU hotplug lock and force an i-cache flush on all CPUs once to set it
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* up, and again to tear it down. These costs add up quickly, so we only want
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* to enable the drain waiter if the drain actually detected a conflict with
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* running intent chains.
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*/
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static inline bool xchk_need_intent_drain(struct xfs_scrub *sc)
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{
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return sc->flags & XCHK_NEED_DRAIN;
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}
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void xchk_fsgates_enable(struct xfs_scrub *sc, unsigned int scrub_fshooks);
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#endif /* __XFS_SCRUB_COMMON_H__ */
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