227 lines
5.5 KiB
C
227 lines
5.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022 Fujitsu. All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_alloc.h"
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#include "xfs_bit.h"
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#include "xfs_btree.h"
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#include "xfs_inode.h"
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#include "xfs_icache.h"
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#include "xfs_rmap.h"
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#include "xfs_rmap_btree.h"
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#include "xfs_rtalloc.h"
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#include "xfs_trans.h"
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#include "xfs_ag.h"
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#include <linux/mm.h>
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#include <linux/dax.h>
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struct failure_info {
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xfs_agblock_t startblock;
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xfs_extlen_t blockcount;
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int mf_flags;
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};
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static pgoff_t
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xfs_failure_pgoff(
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struct xfs_mount *mp,
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const struct xfs_rmap_irec *rec,
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const struct failure_info *notify)
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{
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loff_t pos = XFS_FSB_TO_B(mp, rec->rm_offset);
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if (notify->startblock > rec->rm_startblock)
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pos += XFS_FSB_TO_B(mp,
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notify->startblock - rec->rm_startblock);
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return pos >> PAGE_SHIFT;
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}
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static unsigned long
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xfs_failure_pgcnt(
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struct xfs_mount *mp,
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const struct xfs_rmap_irec *rec,
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const struct failure_info *notify)
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{
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xfs_agblock_t end_rec;
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xfs_agblock_t end_notify;
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xfs_agblock_t start_cross;
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xfs_agblock_t end_cross;
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start_cross = max(rec->rm_startblock, notify->startblock);
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end_rec = rec->rm_startblock + rec->rm_blockcount;
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end_notify = notify->startblock + notify->blockcount;
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end_cross = min(end_rec, end_notify);
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return XFS_FSB_TO_B(mp, end_cross - start_cross) >> PAGE_SHIFT;
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}
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static int
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xfs_dax_failure_fn(
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struct xfs_btree_cur *cur,
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const struct xfs_rmap_irec *rec,
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void *data)
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{
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struct xfs_mount *mp = cur->bc_mp;
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struct xfs_inode *ip;
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struct failure_info *notify = data;
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int error = 0;
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if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) ||
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(rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) {
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xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK);
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return -EFSCORRUPTED;
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}
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/* Get files that incore, filter out others that are not in use. */
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error = xfs_iget(mp, cur->bc_tp, rec->rm_owner, XFS_IGET_INCORE,
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0, &ip);
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/* Continue the rmap query if the inode isn't incore */
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if (error == -ENODATA)
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return 0;
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if (error)
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return error;
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error = mf_dax_kill_procs(VFS_I(ip)->i_mapping,
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xfs_failure_pgoff(mp, rec, notify),
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xfs_failure_pgcnt(mp, rec, notify),
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notify->mf_flags);
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xfs_irele(ip);
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return error;
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}
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static int
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xfs_dax_notify_ddev_failure(
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struct xfs_mount *mp,
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xfs_daddr_t daddr,
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xfs_daddr_t bblen,
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int mf_flags)
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{
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struct xfs_trans *tp = NULL;
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struct xfs_btree_cur *cur = NULL;
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struct xfs_buf *agf_bp = NULL;
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int error = 0;
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xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, daddr);
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xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno);
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xfs_fsblock_t end_fsbno = XFS_DADDR_TO_FSB(mp, daddr + bblen);
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xfs_agnumber_t end_agno = XFS_FSB_TO_AGNO(mp, end_fsbno);
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error = xfs_trans_alloc_empty(mp, &tp);
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if (error)
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return error;
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for (; agno <= end_agno; agno++) {
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struct xfs_rmap_irec ri_low = { };
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struct xfs_rmap_irec ri_high;
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struct failure_info notify;
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struct xfs_agf *agf;
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xfs_agblock_t agend;
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struct xfs_perag *pag;
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pag = xfs_perag_get(mp, agno);
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error = xfs_alloc_read_agf(pag, tp, 0, &agf_bp);
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if (error) {
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xfs_perag_put(pag);
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break;
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}
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cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, pag);
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/*
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* Set the rmap range from ri_low to ri_high, which represents
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* a [start, end] where we looking for the files or metadata.
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*/
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memset(&ri_high, 0xFF, sizeof(ri_high));
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ri_low.rm_startblock = XFS_FSB_TO_AGBNO(mp, fsbno);
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if (agno == end_agno)
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ri_high.rm_startblock = XFS_FSB_TO_AGBNO(mp, end_fsbno);
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agf = agf_bp->b_addr;
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agend = min(be32_to_cpu(agf->agf_length),
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ri_high.rm_startblock);
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notify.startblock = ri_low.rm_startblock;
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notify.blockcount = agend - ri_low.rm_startblock;
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error = xfs_rmap_query_range(cur, &ri_low, &ri_high,
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xfs_dax_failure_fn, ¬ify);
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xfs_btree_del_cursor(cur, error);
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xfs_trans_brelse(tp, agf_bp);
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xfs_perag_put(pag);
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if (error)
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break;
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fsbno = XFS_AGB_TO_FSB(mp, agno + 1, 0);
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}
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xfs_trans_cancel(tp);
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return error;
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}
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static int
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xfs_dax_notify_failure(
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struct dax_device *dax_dev,
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u64 offset,
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u64 len,
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int mf_flags)
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{
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struct xfs_mount *mp = dax_holder(dax_dev);
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u64 ddev_start;
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u64 ddev_end;
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if (!(mp->m_sb.sb_flags & SB_BORN)) {
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xfs_warn(mp, "filesystem is not ready for notify_failure()!");
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return -EIO;
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}
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if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) {
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xfs_warn(mp,
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"notify_failure() not supported on realtime device!");
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return -EOPNOTSUPP;
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}
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if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev &&
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mp->m_logdev_targp != mp->m_ddev_targp) {
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xfs_err(mp, "ondisk log corrupt, shutting down fs!");
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xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK);
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return -EFSCORRUPTED;
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}
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if (!xfs_has_rmapbt(mp)) {
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xfs_warn(mp, "notify_failure() needs rmapbt enabled!");
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return -EOPNOTSUPP;
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}
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ddev_start = mp->m_ddev_targp->bt_dax_part_off;
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ddev_end = ddev_start + bdev_nr_bytes(mp->m_ddev_targp->bt_bdev) - 1;
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/* Ignore the range out of filesystem area */
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if (offset + len < ddev_start)
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return -ENXIO;
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if (offset > ddev_end)
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return -ENXIO;
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/* Calculate the real range when it touches the boundary */
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if (offset > ddev_start)
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offset -= ddev_start;
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else {
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len -= ddev_start - offset;
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offset = 0;
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}
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if (offset + len > ddev_end)
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len -= ddev_end - offset;
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return xfs_dax_notify_ddev_failure(mp, BTOBB(offset), BTOBB(len),
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mf_flags);
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}
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const struct dax_holder_operations xfs_dax_holder_operations = {
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.notify_failure = xfs_dax_notify_failure,
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};
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