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linux-next/fs/xfs/scrub/repair.h

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xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
/*
* Copyright (C) 2018 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __XFS_SCRUB_REPAIR_H__
#define __XFS_SCRUB_REPAIR_H__
static inline int xfs_repair_notsupported(struct xfs_scrub_context *sc)
{
return -EOPNOTSUPP;
}
#ifdef CONFIG_XFS_ONLINE_REPAIR
/* Repair helpers */
int xfs_repair_attempt(struct xfs_inode *ip, struct xfs_scrub_context *sc,
bool *fixed);
void xfs_repair_failure(struct xfs_mount *mp);
xfs: add helpers to deal with transaction allocation and rolling For repairs, we need to reserve at least as many blocks as we think we're going to need to rebuild the data structure, and we're going to need some helpers to roll transactions while maintaining locks on the AG headers so that other threads cannot wander into the middle of a repair. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:08 +08:00
int xfs_repair_roll_ag_trans(struct xfs_scrub_context *sc);
bool xfs_repair_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
enum xfs_ag_resv_type type);
xfs_extlen_t xfs_repair_calc_ag_resblks(struct xfs_scrub_context *sc);
xfs: add helpers to allocate and initialize fresh btree roots Add a pair of helper functions to allocate and initialize fresh btree roots. The repair functions will use these as part of recreating corrupted metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:09 +08:00
int xfs_repair_alloc_ag_block(struct xfs_scrub_context *sc,
struct xfs_owner_info *oinfo, xfs_fsblock_t *fsbno,
enum xfs_ag_resv_type resv);
int xfs_repair_init_btblock(struct xfs_scrub_context *sc, xfs_fsblock_t fsb,
struct xfs_buf **bpp, xfs_btnum_t btnum,
const struct xfs_buf_ops *ops);
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
xfs: add helpers to collect and sift btree block pointers during repair Add some helpers to assemble a list of fs block extents. Generally, repair functions will iterate the rmapbt to make a list (1) of all extents owned by the nominal owner of the metadata structure; then they will iterate all other structures with the same rmap owner to make a list (2) of active blocks; and finally we have a subtraction function to subtract all the blocks in (2) from (1), with the result that (1) is now a list of blocks that were owned by the old btree and must be disposed. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:09 +08:00
struct xfs_repair_extent {
struct list_head list;
xfs_fsblock_t fsbno;
xfs_extlen_t len;
};
struct xfs_repair_extent_list {
struct list_head list;
};
static inline void
xfs_repair_init_extent_list(
struct xfs_repair_extent_list *exlist)
{
INIT_LIST_HEAD(&exlist->list);
}
#define for_each_xfs_repair_extent_safe(rbe, n, exlist) \
list_for_each_entry_safe((rbe), (n), &(exlist)->list, list)
int xfs_repair_collect_btree_extent(struct xfs_scrub_context *sc,
struct xfs_repair_extent_list *btlist, xfs_fsblock_t fsbno,
xfs_extlen_t len);
void xfs_repair_cancel_btree_extents(struct xfs_scrub_context *sc,
struct xfs_repair_extent_list *btlist);
int xfs_repair_subtract_extents(struct xfs_scrub_context *sc,
struct xfs_repair_extent_list *exlist,
struct xfs_repair_extent_list *sublist);
xfs: add helpers to dispose of old btree blocks after a repair Now that we've plumbed in the ability to construct a list of dead btree blocks following a repair, add more helpers to dispose of them. This is done by examining the rmapbt -- if the btree was the only owner we can free the block, otherwise it's crosslinked and we can only remove the rmapbt record. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:10 +08:00
int xfs_repair_fix_freelist(struct xfs_scrub_context *sc, bool can_shrink);
int xfs_repair_invalidate_blocks(struct xfs_scrub_context *sc,
struct xfs_repair_extent_list *btlist);
int xfs_repair_reap_btree_extents(struct xfs_scrub_context *sc,
struct xfs_repair_extent_list *exlist,
struct xfs_owner_info *oinfo, enum xfs_ag_resv_type type);
xfs: add helpers to collect and sift btree block pointers during repair Add some helpers to assemble a list of fs block extents. Generally, repair functions will iterate the rmapbt to make a list (1) of all extents owned by the nominal owner of the metadata structure; then they will iterate all other structures with the same rmap owner to make a list (2) of active blocks; and finally we have a subtraction function to subtract all the blocks in (2) from (1), with the result that (1) is now a list of blocks that were owned by the old btree and must be disposed. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:09 +08:00
xfs: recover AG btree roots from rmap data Add a helper function to help us recover btree roots from the rmap data. Callers pass in a list of rmap owner codes, buffer ops, and magic numbers. We iterate the rmap records looking for owner matches, and then read the matching blocks to see if the magic number & uuid match. If so, we then read-verify the block, and if that passes then we retain a pointer to the block with the highest level, assuming that by the end of the call we will have found the root. This will be used to reset the AGF/AGI btree root fields during their rebuild procedures. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:10 +08:00
struct xfs_repair_find_ag_btree {
/* in: rmap owner of the btree we're looking for */
uint64_t rmap_owner;
/* in: buffer ops */
const struct xfs_buf_ops *buf_ops;
/* in: magic number of the btree */
uint32_t magic;
/* out: the highest btree block found and the tree height */
xfs_agblock_t root;
unsigned int height;
};
int xfs_repair_find_ag_btree_roots(struct xfs_scrub_context *sc,
struct xfs_buf *agf_bp,
struct xfs_repair_find_ag_btree *btree_info,
struct xfs_buf *agfl_bp);
xfs: add helpers to attach quotas to inodes Add a helper routine to attach quota information to inodes that are about to undergo repair. If that fails, we need to schedule a quotacheck for the next mount but allow the corrupted metadata repair to continue. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:11 +08:00
void xfs_repair_force_quotacheck(struct xfs_scrub_context *sc, uint dqtype);
int xfs_repair_ino_dqattach(struct xfs_scrub_context *sc);
xfs: recover AG btree roots from rmap data Add a helper function to help us recover btree roots from the rmap data. Callers pass in a list of rmap owner codes, buffer ops, and magic numbers. We iterate the rmap records looking for owner matches, and then read the matching blocks to see if the magic number & uuid match. If so, we then read-verify the block, and if that passes then we retain a pointer to the block with the highest level, assuming that by the end of the call we will have found the root. This will be used to reset the AGF/AGI btree root fields during their rebuild procedures. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:10 +08:00
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
/* Metadata repairers */
int xfs_repair_probe(struct xfs_scrub_context *sc);
xfs: repair superblocks If one of the backup superblocks is found to differ seriously from superblock 0, write out a fresh copy from the in-core sb. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:12 +08:00
int xfs_repair_superblock(struct xfs_scrub_context *sc);
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
#else
static inline int xfs_repair_attempt(
struct xfs_inode *ip,
struct xfs_scrub_context *sc,
bool *fixed)
{
return -EOPNOTSUPP;
}
static inline void xfs_repair_failure(struct xfs_mount *mp) {}
xfs: add helpers to deal with transaction allocation and rolling For repairs, we need to reserve at least as many blocks as we think we're going to need to rebuild the data structure, and we're going to need some helpers to roll transactions while maintaining locks on the AG headers so that other threads cannot wander into the middle of a repair. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:08 +08:00
static inline xfs_extlen_t
xfs_repair_calc_ag_resblks(
struct xfs_scrub_context *sc)
{
ASSERT(!(sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR));
return 0;
}
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
#define xfs_repair_probe xfs_repair_notsupported
xfs: repair superblocks If one of the backup superblocks is found to differ seriously from superblock 0, write out a fresh copy from the in-core sb. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:12 +08:00
#define xfs_repair_superblock xfs_repair_notsupported
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
#endif /* CONFIG_XFS_ONLINE_REPAIR */
#endif /* __XFS_SCRUB_REPAIR_H__ */
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