diff options
Diffstat (limited to 'fs/xfs/scrub/rtsummary_repair.c')
-rw-r--r-- | fs/xfs/scrub/rtsummary_repair.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/fs/xfs/scrub/rtsummary_repair.c b/fs/xfs/scrub/rtsummary_repair.c new file mode 100644 index 000000000000..1e671d395221 --- /dev/null +++ b/fs/xfs/scrub/rtsummary_repair.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 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_btree.h" +#include "xfs_log_format.h" +#include "xfs_trans.h" +#include "xfs_rtalloc.h" +#include "xfs_inode.h" +#include "xfs_bit.h" +#include "xfs_bmap.h" +#include "xfs_bmap_btree.h" +#include "xfs_swapext.h" +#include "scrub/scrub.h" +#include "scrub/common.h" +#include "scrub/trace.h" +#include "scrub/repair.h" +#include "scrub/tempfile.h" + +/* Set us up to repair the rtsummary file. */ +int +xrep_setup_rtsummary( + struct xfs_scrub *sc, + unsigned int *resblks) +{ + struct xfs_mount *mp = sc->mp; + unsigned long long blocks; + int error; + + error = xrep_tempfile_create(sc, S_IFREG); + if (error) + return error; + + /* + * If we're doing a repair, we reserve enough blocks to write out a + * completely new summary file, plus twice as many blocks as we would + * need if we can only allocate one block per data fork mapping. This + * should cover the preallocation of the temporary file and swapping + * the extent mappings. + * + * We cannot use xfs_swapext_estimate because we have not yet + * constructed the replacement rtsummary and therefore do not know how + * many extents it will use. By the time we do, we will have a dirty + * transaction (which we cannot drop because we cannot drop the + * rtsummary ILOCK) and cannot ask for more reservation. + */ + blocks = XFS_B_TO_FSB(mp, mp->m_rsumsize); + blocks += xfs_bmbt_calc_size(mp, blocks) * 2; + if (blocks > UINT_MAX) + return -EOPNOTSUPP; + + *resblks = blocks; + return 0; +} + +/* Repair the realtime summary. */ +int +xrep_rtsummary( + struct xfs_scrub *sc) +{ + struct xfs_swapext_req req = { .req_flags = 0 }; + int error; + + /* Make sure any problems with the fork are fixed. */ + error = xrep_metadata_inode_forks(sc); + if (error) + return error; + + /* + * Trylock the temporary file. We had better be the only ones holding + * onto this inode... + */ + if (!xrep_tempfile_ilock_nowait(sc, XFS_ILOCK_EXCL)) + return -EAGAIN; + + /* Make sure we have space allocated for the entire summary file. */ + xfs_trans_ijoin(sc->tp, sc->ip, 0); + xfs_trans_ijoin(sc->tp, sc->tempip, 0); + error = xrep_tempfile_prealloc(sc, 0, + XFS_B_TO_FSB(sc->mp, sc->mp->m_rsumsize)); + if (error) + return error; + + /* Copy the rtsummary file that we generated. */ + error = xrep_tempfile_copyin(sc, &xfs_rtbuf_ops, + XFS_BLFT_RTSUMMARY_BUF, sc->mp->m_rsumsize); + if (error) + return error; + + /* Now swap the extents. */ + req.ip1 = sc->tempip; + req.ip2 = sc->ip; + req.whichfork = XFS_DATA_FORK; + req.blockcount = XFS_B_TO_FSB(sc->mp, sc->mp->m_rsumsize); + return xfs_swapext(&sc->tp, &req); +} |