add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/xfs/libxfs/xfs_ag.c
..
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@@ -10,6 +10,7 @@
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 #include "xfs_shared.h"
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 #include "xfs_format.h"
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 #include "xfs_trans_resv.h"
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+#include "xfs_bit.h"
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 #include "xfs_sb.h"
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 #include "xfs_mount.h"
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 #include "xfs_btree.h"
..
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@@ -19,27 +20,37 @@
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 #include "xfs_ialloc.h"
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 #include "xfs_rmap.h"
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 #include "xfs_ag.h"
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+#include "xfs_ag_resv.h"
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+#include "xfs_health.h"
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25
 
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-static struct xfs_buf *
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+static int
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 xfs_get_aghdr_buf(
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 	struct xfs_mount	*mp,
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 	xfs_daddr_t		blkno,
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 	size_t			numblks,
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-	int			flags,
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+	struct xfs_buf		**bpp,
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 	const struct xfs_buf_ops *ops)
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 {
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 	struct xfs_buf		*bp;
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+	int			error;
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36
 
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-	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
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-	if (!bp)
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-		return NULL;
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+	error = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, 0, &bp);
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+	if (error)
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+		return error;
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40
 
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 	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
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 	bp->b_bn = blkno;
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 	bp->b_maps[0].bm_bn = blkno;
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 	bp->b_ops = ops;
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45
 
42
-	return bp;
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+	*bpp = bp;
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+	return 0;
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+}
49
+
50
+static inline bool is_log_ag(struct xfs_mount *mp, struct aghdr_init_data *id)
51
+{
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+	return mp->m_sb.sb_logstart > 0 &&
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+	       id->agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart);
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54
 }
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55
 
45
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 /*
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@@ -51,7 +62,62 @@
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 	struct xfs_buf		*bp,
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 	struct aghdr_init_data	*id)
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 {
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-	xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
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+	xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno);
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+}
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+
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+/* Finish initializing a free space btree. */
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+static void
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+xfs_freesp_init_recs(
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+	struct xfs_mount	*mp,
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+	struct xfs_buf		*bp,
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+	struct aghdr_init_data	*id)
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+{
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+	struct xfs_alloc_rec	*arec;
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+	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
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+
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+	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
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+	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
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+
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+	if (is_log_ag(mp, id)) {
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+		struct xfs_alloc_rec	*nrec;
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+		xfs_agblock_t		start = XFS_FSB_TO_AGBNO(mp,
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+							mp->m_sb.sb_logstart);
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+
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+		ASSERT(start >= mp->m_ag_prealloc_blocks);
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+		if (start != mp->m_ag_prealloc_blocks) {
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+			/*
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+			 * Modify first record to pad stripe align of log
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+			 */
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+			arec->ar_blockcount = cpu_to_be32(start -
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+						mp->m_ag_prealloc_blocks);
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+			nrec = arec + 1;
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+
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+			/*
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+			 * Insert second record at start of internal log
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+			 * which then gets trimmed.
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+			 */
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+			nrec->ar_startblock = cpu_to_be32(
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+					be32_to_cpu(arec->ar_startblock) +
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+					be32_to_cpu(arec->ar_blockcount));
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+			arec = nrec;
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+			be16_add_cpu(&block->bb_numrecs, 1);
104
+		}
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+		/*
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+		 * Change record start to after the internal log
107
+		 */
108
+		be32_add_cpu(&arec->ar_startblock, mp->m_sb.sb_logblocks);
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+	}
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+
111
+	/*
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+	 * Calculate the record block count and check for the case where
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+	 * the log might have consumed all available space in the AG. If
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+	 * so, reset the record count to 0 to avoid exposure of an invalid
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+	 * record start block.
116
+	 */
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+	arec->ar_blockcount = cpu_to_be32(id->agsize -
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+					  be32_to_cpu(arec->ar_startblock));
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+	if (!arec->ar_blockcount)
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+		block->bb_numrecs = 0;
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121
 }
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122
 
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 /*
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@@ -63,13 +129,8 @@
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 	struct xfs_buf		*bp,
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130
 	struct aghdr_init_data	*id)
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131
 {
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-	struct xfs_alloc_rec	*arec;
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-
68
-	xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
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-	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
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-	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
71
-	arec->ar_blockcount = cpu_to_be32(id->agsize -
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-					  be32_to_cpu(arec->ar_startblock));
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+	xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno);
133
+	xfs_freesp_init_recs(mp, bp, id);
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134
 }
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135
 
75
136
 static void
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@@ -78,13 +139,8 @@
78
139
 	struct xfs_buf		*bp,
79
140
 	struct aghdr_init_data	*id)
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141
 {
81
-	struct xfs_alloc_rec	*arec;
82
-
83
-	xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
84
-	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
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-	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
86
-	arec->ar_blockcount = cpu_to_be32(id->agsize -
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-					  be32_to_cpu(arec->ar_startblock));
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+	xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno);
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+	xfs_freesp_init_recs(mp, bp, id);
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144
 }
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145
 
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 /*
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@@ -99,7 +155,7 @@
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 	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
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156
 	struct xfs_rmap_rec	*rrec;
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157
 
102
-	xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
158
+	xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno);
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159
 
104
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 	/*
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161
 	 * mark the AG header regions as static metadata The BNO
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@@ -147,6 +203,18 @@
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 		rrec->rm_offset = 0;
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 		be16_add_cpu(&block->bb_numrecs, 1);
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 	}
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+
207
+	/* account for the log space */
208
+	if (is_log_ag(mp, id)) {
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+		rrec = XFS_RMAP_REC_ADDR(block,
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+				be16_to_cpu(block->bb_numrecs) + 1);
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+		rrec->rm_startblock = cpu_to_be32(
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+				XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart));
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+		rrec->rm_blockcount = cpu_to_be32(mp->m_sb.sb_logblocks);
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+		rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_LOG);
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+		rrec->rm_offset = 0;
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+		be16_add_cpu(&block->bb_numrecs, 1);
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+	}
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218
 }
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219
 
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 /*
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@@ -163,7 +231,7 @@
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 	struct xfs_buf		*bp,
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 	struct aghdr_init_data	*id)
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233
 {
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-	struct xfs_dsb		*dsb = XFS_BUF_TO_SBP(bp);
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+	struct xfs_dsb		*dsb = bp->b_addr;
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235
 
168
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 	xfs_sb_to_disk(dsb, &mp->m_sb);
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237
 	dsb->sb_inprogress = 1;
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@@ -175,7 +243,7 @@
175
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 	struct xfs_buf		*bp,
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 	struct aghdr_init_data	*id)
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245
 {
178
-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(bp);
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+	struct xfs_agf		*agf = bp->b_addr;
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247
 	xfs_extlen_t		tmpsize;
180
248
 
181
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 	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
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@@ -207,6 +275,14 @@
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 		agf->agf_refcount_level = cpu_to_be32(1);
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276
 		agf->agf_refcount_blocks = cpu_to_be32(1);
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277
 	}
278
+
279
+	if (is_log_ag(mp, id)) {
280
+		int64_t	logblocks = mp->m_sb.sb_logblocks;
281
+
282
+		be32_add_cpu(&agf->agf_freeblks, -logblocks);
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+		agf->agf_longest = cpu_to_be32(id->agsize -
284
+			XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart) - logblocks);
285
+	}
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286
 }
211
287
 
212
288
 static void
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@@ -225,7 +301,7 @@
225
301
 		uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
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302
 	}
227
303
 
228
-	agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
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+	agfl_bno = xfs_buf_to_agfl_bno(bp);
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305
 	for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
230
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 		agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
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 }
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@@ -236,7 +312,7 @@
236
312
 	struct xfs_buf		*bp,
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 	struct aghdr_init_data	*id)
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314
 {
239
-	struct xfs_agi		*agi = XFS_BUF_TO_AGI(bp);
315
+	struct xfs_agi		*agi = bp->b_addr;
240
316
 	int			bucket;
241
317
 
242
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 	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
..
..
@@ -257,6 +333,11 @@
257
333
 	}
258
334
 	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
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335
 		agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
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+	if (xfs_sb_version_hasinobtcounts(&mp->m_sb)) {
337
+		agi->agi_iblocks = cpu_to_be32(1);
338
+		if (xfs_sb_version_hasfinobt(&mp->m_sb))
339
+			agi->agi_fblocks = cpu_to_be32(1);
340
+	}
260
341
 }
261
342
 
262
343
 typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp,
..
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@@ -267,13 +348,13 @@
267
348
 	struct aghdr_init_data	*id,
268
349
 	aghdr_init_work_f	work,
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350
 	const struct xfs_buf_ops *ops)
270
-
271
351
 {
272
352
 	struct xfs_buf		*bp;
353
+	int			error;
273
354
 
274
-	bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
275
-	if (!bp)
276
-		return -ENOMEM;
355
+	error = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, &bp, ops);
356
+	if (error)
357
+		return error;
277
358
 
278
359
 	(*work)(mp, bp, id);
279
360
 
..
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@@ -339,14 +420,14 @@
339
420
 	{ /* BNO root block */
340
421
 		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
341
422
 		.numblks = BTOBB(mp->m_sb.sb_blocksize),
342
-		.ops = &xfs_allocbt_buf_ops,
423
+		.ops = &xfs_bnobt_buf_ops,
343
424
 		.work = &xfs_bnoroot_init,
344
425
 		.need_init = true
345
426
 	},
346
427
 	{ /* CNT root block */
347
428
 		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
348
429
 		.numblks = BTOBB(mp->m_sb.sb_blocksize),
349
-		.ops = &xfs_allocbt_buf_ops,
430
+		.ops = &xfs_cntbt_buf_ops,
350
431
 		.work = &xfs_cntroot_init,
351
432
 		.need_init = true
352
433
 	},
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@@ -361,7 +442,7 @@
361
442
 	{ /* FINO root block */
362
443
 		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
363
444
 		.numblks = BTOBB(mp->m_sb.sb_blocksize),
364
-		.ops = &xfs_inobt_buf_ops,
445
+		.ops = &xfs_finobt_buf_ops,
365
446
 		.work = &xfs_btroot_init,
366
447
 		.type = XFS_BTNUM_FINO,
367
448
 		.need_init =  xfs_sb_version_hasfinobt(&mp->m_sb)
..
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@@ -414,7 +495,6 @@
414
495
 	struct aghdr_init_data	*id,
415
496
 	xfs_extlen_t		len)
416
497
 {
417
-	struct xfs_owner_info	oinfo;
418
498
 	struct xfs_buf		*bp;
419
499
 	struct xfs_agi		*agi;
420
500
 	struct xfs_agf		*agf;
..
..
@@ -427,7 +507,7 @@
427
507
 	if (error)
428
508
 		return error;
429
509
 
430
-	agi = XFS_BUF_TO_AGI(bp);
510
+	agi = bp->b_addr;
431
511
 	be32_add_cpu(&agi->agi_length, len);
432
512
 	ASSERT(id->agno == mp->m_sb.sb_agcount - 1 ||
433
513
 	       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
..
..
@@ -440,7 +520,7 @@
440
520
 	if (error)
441
521
 		return error;
442
522
 
443
-	agf = XFS_BUF_TO_AGF(bp);
523
+	agf = bp->b_addr;
444
524
 	be32_add_cpu(&agf->agf_length, len);
445
525
 	ASSERT(agf->agf_length == agi->agi_length);
446
526
 	xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
..
..
@@ -448,17 +528,69 @@
448
528
 	/*
449
529
 	 * Free the new space.
450
530
 	 *
451
-	 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
531
+	 * XFS_RMAP_OINFO_SKIP_UPDATE is used here to tell the rmap btree that
452
532
 	 * this doesn't actually exist in the rmap btree.
453
533
 	 */
454
-	xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
455
534
 	error = xfs_rmap_free(tp, bp, id->agno,
456
535
 				be32_to_cpu(agf->agf_length) - len,
457
-				len, &oinfo);
536
+				len, &XFS_RMAP_OINFO_SKIP_UPDATE);
458
537
 	if (error)
459
538
 		return error;
460
539
 
461
540
 	return  xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
462
541
 					be32_to_cpu(agf->agf_length) - len),
463
-				len, &oinfo, XFS_AG_RESV_NONE);
542
+				len, &XFS_RMAP_OINFO_SKIP_UPDATE,
543
+				XFS_AG_RESV_NONE);
544
+}
545
+
546
+/* Retrieve AG geometry. */
547
+int
548
+xfs_ag_get_geometry(
549
+	struct xfs_mount	*mp,
550
+	xfs_agnumber_t		agno,
551
+	struct xfs_ag_geometry	*ageo)
552
+{
553
+	struct xfs_buf		*agi_bp;
554
+	struct xfs_buf		*agf_bp;
555
+	struct xfs_agi		*agi;
556
+	struct xfs_agf		*agf;
557
+	struct xfs_perag	*pag;
558
+	unsigned int		freeblks;
559
+	int			error;
560
+
561
+	if (agno >= mp->m_sb.sb_agcount)
562
+		return -EINVAL;
563
+
564
+	/* Lock the AG headers. */
565
+	error = xfs_ialloc_read_agi(mp, NULL, agno, &agi_bp);
566
+	if (error)
567
+		return error;
568
+	error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agf_bp);
569
+	if (error)
570
+		goto out_agi;
571
+
572
+	pag = agi_bp->b_pag;
573
+
574
+	/* Fill out form. */
575
+	memset(ageo, 0, sizeof(*ageo));
576
+	ageo->ag_number = agno;
577
+
578
+	agi = agi_bp->b_addr;
579
+	ageo->ag_icount = be32_to_cpu(agi->agi_count);
580
+	ageo->ag_ifree = be32_to_cpu(agi->agi_freecount);
581
+
582
+	agf = agf_bp->b_addr;
583
+	ageo->ag_length = be32_to_cpu(agf->agf_length);
584
+	freeblks = pag->pagf_freeblks +
585
+		   pag->pagf_flcount +
586
+		   pag->pagf_btreeblks -
587
+		   xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE);
588
+	ageo->ag_freeblks = freeblks;
589
+	xfs_ag_geom_health(pag, ageo);
590
+
591
+	/* Release resources. */
592
+	xfs_buf_relse(agf_bp);
593
+out_agi:
594
+	xfs_buf_relse(agi_bp);
595
+	return error;
464
596
 }