From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/xfs/xfs_discard.c | 218 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 fs/xfs/xfs_discard.c (limited to 'fs/xfs/xfs_discard.c') diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c new file mode 100644 index 000000000..bfc829c07 --- /dev/null +++ b/fs/xfs/xfs_discard.c @@ -0,0 +1,218 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2010 Red Hat, Inc. + * All Rights Reserved. + */ +#include "xfs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_btree.h" +#include "xfs_alloc_btree.h" +#include "xfs_alloc.h" +#include "xfs_discard.h" +#include "xfs_error.h" +#include "xfs_extent_busy.h" +#include "xfs_trace.h" +#include "xfs_log.h" +#include "xfs_ag.h" + +STATIC int +xfs_trim_extents( + struct xfs_mount *mp, + xfs_agnumber_t agno, + xfs_daddr_t start, + xfs_daddr_t end, + xfs_daddr_t minlen, + uint64_t *blocks_trimmed) +{ + struct block_device *bdev = mp->m_ddev_targp->bt_bdev; + struct xfs_btree_cur *cur; + struct xfs_buf *agbp; + struct xfs_agf *agf; + struct xfs_perag *pag; + int error; + int i; + + pag = xfs_perag_get(mp, agno); + + /* + * Force out the log. This means any transactions that might have freed + * space before we take the AGF buffer lock are now on disk, and the + * volatile disk cache is flushed. + */ + xfs_log_force(mp, XFS_LOG_SYNC); + + error = xfs_alloc_read_agf(pag, NULL, 0, &agbp); + if (error) + goto out_put_perag; + agf = agbp->b_addr; + + cur = xfs_allocbt_init_cursor(mp, NULL, agbp, pag, XFS_BTNUM_CNT); + + /* + * Look up the longest btree in the AGF and start with it. + */ + error = xfs_alloc_lookup_ge(cur, 0, be32_to_cpu(agf->agf_longest), &i); + if (error) + goto out_del_cursor; + + /* + * Loop until we are done with all extents that are large + * enough to be worth discarding. + */ + while (i) { + xfs_agblock_t fbno; + xfs_extlen_t flen; + xfs_daddr_t dbno; + xfs_extlen_t dlen; + + error = xfs_alloc_get_rec(cur, &fbno, &flen, &i); + if (error) + goto out_del_cursor; + if (XFS_IS_CORRUPT(mp, i != 1)) { + error = -EFSCORRUPTED; + goto out_del_cursor; + } + ASSERT(flen <= be32_to_cpu(agf->agf_longest)); + + /* + * use daddr format for all range/len calculations as that is + * the format the range/len variables are supplied in by + * userspace. + */ + dbno = XFS_AGB_TO_DADDR(mp, agno, fbno); + dlen = XFS_FSB_TO_BB(mp, flen); + + /* + * Too small? Give up. + */ + if (dlen < minlen) { + trace_xfs_discard_toosmall(mp, agno, fbno, flen); + goto out_del_cursor; + } + + /* + * If the extent is entirely outside of the range we are + * supposed to discard skip it. Do not bother to trim + * down partially overlapping ranges for now. + */ + if (dbno + dlen < start || dbno > end) { + trace_xfs_discard_exclude(mp, agno, fbno, flen); + goto next_extent; + } + + /* + * If any blocks in the range are still busy, skip the + * discard and try again the next time. + */ + if (xfs_extent_busy_search(mp, pag, fbno, flen)) { + trace_xfs_discard_busy(mp, agno, fbno, flen); + goto next_extent; + } + + trace_xfs_discard_extent(mp, agno, fbno, flen); + error = blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS); + if (error) + goto out_del_cursor; + *blocks_trimmed += flen; + +next_extent: + error = xfs_btree_decrement(cur, 0, &i); + if (error) + goto out_del_cursor; + + if (fatal_signal_pending(current)) { + error = -ERESTARTSYS; + goto out_del_cursor; + } + } + +out_del_cursor: + xfs_btree_del_cursor(cur, error); + xfs_buf_relse(agbp); +out_put_perag: + xfs_perag_put(pag); + return error; +} + +/* + * trim a range of the filesystem. + * + * Note: the parameters passed from userspace are byte ranges into the + * filesystem which does not match to the format we use for filesystem block + * addressing. FSB addressing is sparse (AGNO|AGBNO), while the incoming format + * is a linear address range. Hence we need to use DADDR based conversions and + * comparisons for determining the correct offset and regions to trim. + */ +int +xfs_ioc_trim( + struct xfs_mount *mp, + struct fstrim_range __user *urange) +{ + unsigned int granularity = + bdev_discard_granularity(mp->m_ddev_targp->bt_bdev); + struct fstrim_range range; + xfs_daddr_t start, end, minlen; + xfs_agnumber_t start_agno, end_agno, agno; + uint64_t blocks_trimmed = 0; + int error, last_error = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (!bdev_max_discard_sectors(mp->m_ddev_targp->bt_bdev)) + return -EOPNOTSUPP; + + /* + * We haven't recovered the log, so we cannot use our bnobt-guided + * storage zapping commands. + */ + if (xfs_has_norecovery(mp)) + return -EROFS; + + if (copy_from_user(&range, urange, sizeof(range))) + return -EFAULT; + + range.minlen = max_t(u64, granularity, range.minlen); + minlen = BTOBB(range.minlen); + /* + * Truncating down the len isn't actually quite correct, but using + * BBTOB would mean we trivially get overflows for values + * of ULLONG_MAX or slightly lower. And ULLONG_MAX is the default + * used by the fstrim application. In the end it really doesn't + * matter as trimming blocks is an advisory interface. + */ + if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks) || + range.minlen > XFS_FSB_TO_B(mp, mp->m_ag_max_usable) || + range.len < mp->m_sb.sb_blocksize) + return -EINVAL; + + start = BTOBB(range.start); + end = start + BTOBBT(range.len) - 1; + + if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1) + end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1; + + start_agno = xfs_daddr_to_agno(mp, start); + end_agno = xfs_daddr_to_agno(mp, end); + + for (agno = start_agno; agno <= end_agno; agno++) { + error = xfs_trim_extents(mp, agno, start, end, minlen, + &blocks_trimmed); + if (error) { + last_error = error; + if (error == -ERESTARTSYS) + break; + } + } + + if (last_error) + return last_error; + + range.len = XFS_FSB_TO_B(mp, blocks_trimmed); + if (copy_to_user(urange, &range, sizeof(range))) + return -EFAULT; + return 0; +} -- cgit v1.2.3