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a07b455762
Teach the online directory repair code to scan the filesystem so that we can set the dotdot entry when we're rebuilding a directory. This involves dropping ILOCK on the directory that we're repairing, which means that the VFS can sneak in and tell us to update dotdot at any time. Deal with these races by using a dirent hook to absorb dotdot updates, and be careful not to check the scan results until after we've retaken the ILOCK. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2021-2024 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_ISCAN_H__
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#define __XFS_SCRUB_ISCAN_H__
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struct xchk_iscan {
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struct xfs_scrub *sc;
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/* Lock to protect the scan cursor. */
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struct mutex lock;
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/*
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* This is the first inode in the inumber address space that we
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* examined. When the scan wraps around back to here, the scan is
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* finished.
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*/
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xfs_ino_t scan_start_ino;
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/* This is the inode that will be examined next. */
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xfs_ino_t cursor_ino;
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/* If nonzero and non-NULL, skip this inode when scanning. */
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xfs_ino_t skip_ino;
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/*
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* This is the last inode that we've successfully scanned, either
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* because the caller scanned it, or we moved the cursor past an empty
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* part of the inode address space. Scan callers should only use the
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* xchk_iscan_visit function to modify this.
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*/
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xfs_ino_t __visited_ino;
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/* Operational state of the livescan. */
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unsigned long __opstate;
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/* Give up on iterating @cursor_ino if we can't iget it by this time. */
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unsigned long __iget_deadline;
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/* Amount of time (in ms) that we will try to iget an inode. */
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unsigned int iget_timeout;
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/* Wait this many ms to retry an iget. */
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unsigned int iget_retry_delay;
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/*
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* The scan grabs batches of inodes and stashes them here before
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* handing them out with _iter. Unallocated inodes are set in the
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* mask so that all updates to that inode are selected for live
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* update propagation.
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*/
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xfs_ino_t __batch_ino;
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xfs_inofree_t __skipped_inomask;
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struct xfs_inode *__inodes[XFS_INODES_PER_CHUNK];
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};
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/* Set if the scan has been aborted due to some event in the fs. */
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#define XCHK_ISCAN_OPSTATE_ABORTED (1)
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/* Use trylock to acquire the AGI */
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#define XCHK_ISCAN_OPSTATE_TRYLOCK_AGI (2)
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static inline bool
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xchk_iscan_aborted(const struct xchk_iscan *iscan)
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{
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return test_bit(XCHK_ISCAN_OPSTATE_ABORTED, &iscan->__opstate);
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}
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static inline void
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xchk_iscan_abort(struct xchk_iscan *iscan)
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{
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set_bit(XCHK_ISCAN_OPSTATE_ABORTED, &iscan->__opstate);
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}
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static inline bool
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xchk_iscan_agi_needs_trylock(const struct xchk_iscan *iscan)
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{
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return test_bit(XCHK_ISCAN_OPSTATE_TRYLOCK_AGI, &iscan->__opstate);
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}
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static inline void
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xchk_iscan_set_agi_trylock(struct xchk_iscan *iscan)
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{
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set_bit(XCHK_ISCAN_OPSTATE_TRYLOCK_AGI, &iscan->__opstate);
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}
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void xchk_iscan_start(struct xfs_scrub *sc, unsigned int iget_timeout,
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unsigned int iget_retry_delay, struct xchk_iscan *iscan);
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void xchk_iscan_finish_early(struct xchk_iscan *iscan);
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void xchk_iscan_teardown(struct xchk_iscan *iscan);
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int xchk_iscan_iter(struct xchk_iscan *iscan, struct xfs_inode **ipp);
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void xchk_iscan_iter_finish(struct xchk_iscan *iscan);
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void xchk_iscan_mark_visited(struct xchk_iscan *iscan, struct xfs_inode *ip);
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bool xchk_iscan_want_live_update(struct xchk_iscan *iscan, xfs_ino_t ino);
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#endif /* __XFS_SCRUB_ISCAN_H__ */
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