add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/xfs/xfs_discard.c
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@@ -4,19 +4,18 @@
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  * 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_sb.h"
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 #include "xfs_mount.h"
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-#include "xfs_quota.h"
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-#include "xfs_inode.h"
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 #include "xfs_btree.h"
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 #include "xfs_alloc_btree.h"
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 #include "xfs_alloc.h"
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+#include "xfs_discard.h"
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 #include "xfs_error.h"
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 #include "xfs_extent_busy.h"
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-#include "xfs_discard.h"
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 #include "xfs_trace.h"
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 #include "xfs_log.h"
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@@ -32,6 +31,7 @@
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 	struct block_device	*bdev = mp->m_ddev_targp->bt_bdev;
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 	struct xfs_btree_cur	*cur;
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 	struct xfs_buf		*agbp;
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+	struct xfs_agf		*agf;
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 	struct xfs_perag	*pag;
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 	int			error;
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 	int			i;
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@@ -46,16 +46,16 @@
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 	xfs_log_force(mp, XFS_LOG_SYNC);
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 	error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
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-	if (error || !agbp)
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+	if (error)
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 		goto out_put_perag;
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+	agf = agbp->b_addr;
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 	cur = xfs_allocbt_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_CNT);
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 	/*
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 	 * Look up the longest btree in the AGF and start with it.
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 	 */
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-	error = xfs_alloc_lookup_ge(cur, 0,
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-			    be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest), &i);
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+	error = xfs_alloc_lookup_ge(cur, 0, be32_to_cpu(agf->agf_longest), &i);
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 	if (error)
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 		goto out_del_cursor;
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@@ -72,8 +72,11 @@
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 		error = xfs_alloc_get_rec(cur, &fbno, &flen, &i);
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 		if (error)
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 			goto out_del_cursor;
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-		XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_del_cursor);
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-		ASSERT(flen <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest));
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+		if (XFS_IS_CORRUPT(mp, i != 1)) {
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+			error = -EFSCORRUPTED;
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+			goto out_del_cursor;
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+		}
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+		ASSERT(flen <= be32_to_cpu(agf->agf_longest));
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 		/*
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 		 * use daddr format for all range/len calculations as that is
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@@ -161,9 +164,19 @@
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 		return -EPERM;
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 	if (!blk_queue_discard(q))
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 		return -EOPNOTSUPP;
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+
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+	/*
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+	 * We haven't recovered the log, so we cannot use our bnobt-guided
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+	 * storage zapping commands.
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+	 */
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+	if (mp->m_flags & XFS_MOUNT_NORECOVERY)
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+		return -EROFS;
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+
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 	if (copy_from_user(&range, urange, sizeof(range)))
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 		return -EFAULT;
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+	range.minlen = max_t(u64, granularity, range.minlen);
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+	minlen = BTOBB(range.minlen);
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 	/*
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 	 * Truncating down the len isn't actually quite correct, but using
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 	 * BBTOB would mean we trivially get overflows for values
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@@ -178,7 +191,6 @@
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 	start = BTOBB(range.start);
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 	end = start + BTOBBT(range.len) - 1;
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-	minlen = BTOBB(max_t(u64, granularity, range.minlen));
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 	if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
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 		end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1;