537 строки
17 KiB
C
537 строки
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_BTREE_H__
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#define __XFS_BTREE_H__
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struct xfs_buf;
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struct xfs_inode;
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struct xfs_mount;
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struct xfs_trans;
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extern kmem_zone_t *xfs_btree_cur_zone;
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/*
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* Generic key, ptr and record wrapper structures.
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*
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* These are disk format structures, and are converted where necessary
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* by the btree specific code that needs to interpret them.
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*/
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union xfs_btree_ptr {
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__be32 s; /* short form ptr */
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__be64 l; /* long form ptr */
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};
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/*
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* The in-core btree key. Overlapping btrees actually store two keys
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* per pointer, so we reserve enough memory to hold both. The __*bigkey
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* items should never be accessed directly.
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*/
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union xfs_btree_key {
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struct xfs_bmbt_key bmbt;
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xfs_bmdr_key_t bmbr; /* bmbt root block */
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xfs_alloc_key_t alloc;
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struct xfs_inobt_key inobt;
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struct xfs_rmap_key rmap;
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struct xfs_rmap_key __rmap_bigkey[2];
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struct xfs_refcount_key refc;
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};
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union xfs_btree_rec {
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struct xfs_bmbt_rec bmbt;
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xfs_bmdr_rec_t bmbr; /* bmbt root block */
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struct xfs_alloc_rec alloc;
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struct xfs_inobt_rec inobt;
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struct xfs_rmap_rec rmap;
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struct xfs_refcount_rec refc;
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};
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/*
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* This nonsense is to make -wlint happy.
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*/
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#define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi)
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#define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi)
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#define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi)
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#define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi)
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#define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi)
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#define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi)
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#define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi)
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#define XFS_BTNUM_FINO ((xfs_btnum_t)XFS_BTNUM_FINOi)
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#define XFS_BTNUM_RMAP ((xfs_btnum_t)XFS_BTNUM_RMAPi)
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#define XFS_BTNUM_REFC ((xfs_btnum_t)XFS_BTNUM_REFCi)
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uint32_t xfs_btree_magic(int crc, xfs_btnum_t btnum);
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/*
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* For logging record fields.
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*/
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#define XFS_BB_MAGIC (1 << 0)
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#define XFS_BB_LEVEL (1 << 1)
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#define XFS_BB_NUMRECS (1 << 2)
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#define XFS_BB_LEFTSIB (1 << 3)
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#define XFS_BB_RIGHTSIB (1 << 4)
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#define XFS_BB_BLKNO (1 << 5)
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#define XFS_BB_LSN (1 << 6)
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#define XFS_BB_UUID (1 << 7)
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#define XFS_BB_OWNER (1 << 8)
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#define XFS_BB_NUM_BITS 5
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#define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1)
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#define XFS_BB_NUM_BITS_CRC 9
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#define XFS_BB_ALL_BITS_CRC ((1 << XFS_BB_NUM_BITS_CRC) - 1)
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/*
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* Generic stats interface
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*/
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#define XFS_BTREE_STATS_INC(cur, stat) \
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XFS_STATS_INC_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat)
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#define XFS_BTREE_STATS_ADD(cur, stat, val) \
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XFS_STATS_ADD_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat, val)
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#define XFS_BTREE_MAXLEVELS 9 /* max of all btrees */
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struct xfs_btree_ops {
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/* size of the key and record structures */
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size_t key_len;
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size_t rec_len;
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/* cursor operations */
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struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
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void (*update_cursor)(struct xfs_btree_cur *src,
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struct xfs_btree_cur *dst);
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/* update btree root pointer */
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void (*set_root)(struct xfs_btree_cur *cur,
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union xfs_btree_ptr *nptr, int level_change);
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/* block allocation / freeing */
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int (*alloc_block)(struct xfs_btree_cur *cur,
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union xfs_btree_ptr *start_bno,
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union xfs_btree_ptr *new_bno,
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int *stat);
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int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp);
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/* update last record information */
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void (*update_lastrec)(struct xfs_btree_cur *cur,
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struct xfs_btree_block *block,
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union xfs_btree_rec *rec,
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int ptr, int reason);
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/* records in block/level */
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int (*get_minrecs)(struct xfs_btree_cur *cur, int level);
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int (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
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/* records on disk. Matter for the root in inode case. */
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int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level);
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/* init values of btree structures */
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void (*init_key_from_rec)(union xfs_btree_key *key,
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union xfs_btree_rec *rec);
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void (*init_rec_from_cur)(struct xfs_btree_cur *cur,
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union xfs_btree_rec *rec);
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void (*init_ptr_from_cur)(struct xfs_btree_cur *cur,
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union xfs_btree_ptr *ptr);
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void (*init_high_key_from_rec)(union xfs_btree_key *key,
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union xfs_btree_rec *rec);
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/* difference between key value and cursor value */
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int64_t (*key_diff)(struct xfs_btree_cur *cur,
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union xfs_btree_key *key);
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/*
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* Difference between key2 and key1 -- positive if key1 > key2,
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* negative if key1 < key2, and zero if equal.
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*/
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int64_t (*diff_two_keys)(struct xfs_btree_cur *cur,
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union xfs_btree_key *key1,
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union xfs_btree_key *key2);
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const struct xfs_buf_ops *buf_ops;
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/* check that k1 is lower than k2 */
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int (*keys_inorder)(struct xfs_btree_cur *cur,
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union xfs_btree_key *k1,
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union xfs_btree_key *k2);
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/* check that r1 is lower than r2 */
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int (*recs_inorder)(struct xfs_btree_cur *cur,
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union xfs_btree_rec *r1,
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union xfs_btree_rec *r2);
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};
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/*
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* Reasons for the update_lastrec method to be called.
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*/
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#define LASTREC_UPDATE 0
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#define LASTREC_INSREC 1
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#define LASTREC_DELREC 2
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union xfs_btree_irec {
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struct xfs_alloc_rec_incore a;
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struct xfs_bmbt_irec b;
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struct xfs_inobt_rec_incore i;
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struct xfs_rmap_irec r;
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struct xfs_refcount_irec rc;
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};
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/* Per-AG btree private information. */
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union xfs_btree_cur_private {
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struct {
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unsigned long nr_ops; /* # record updates */
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int shape_changes; /* # of extent splits */
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} refc;
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struct {
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bool active; /* allocation cursor state */
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} abt;
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};
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/*
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* Btree cursor structure.
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* This collects all information needed by the btree code in one place.
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*/
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typedef struct xfs_btree_cur
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{
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struct xfs_trans *bc_tp; /* transaction we're in, if any */
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struct xfs_mount *bc_mp; /* file system mount struct */
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const struct xfs_btree_ops *bc_ops;
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uint bc_flags; /* btree features - below */
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union xfs_btree_irec bc_rec; /* current insert/search record value */
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struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */
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int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */
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uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */
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#define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */
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#define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */
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uint8_t bc_nlevels; /* number of levels in the tree */
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uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */
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xfs_btnum_t bc_btnum; /* identifies which btree type */
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int bc_statoff; /* offset of btre stats array */
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union {
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struct { /* needed for BNO, CNT, INO */
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struct xfs_buf *agbp; /* agf/agi buffer pointer */
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xfs_agnumber_t agno; /* ag number */
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union xfs_btree_cur_private priv;
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} a;
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struct { /* needed for BMAP */
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struct xfs_inode *ip; /* pointer to our inode */
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int allocated; /* count of alloced */
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short forksize; /* fork's inode space */
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char whichfork; /* data or attr fork */
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char flags; /* flags */
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#define XFS_BTCUR_BPRV_WASDEL (1<<0) /* was delayed */
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#define XFS_BTCUR_BPRV_INVALID_OWNER (1<<1) /* for ext swap */
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} b;
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} bc_private; /* per-btree type data */
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} xfs_btree_cur_t;
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/* cursor flags */
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#define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */
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#define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */
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#define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */
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#define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */
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#define XFS_BTREE_OVERLAPPING (1<<4) /* overlapping intervals */
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#define XFS_BTREE_NOERROR 0
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#define XFS_BTREE_ERROR 1
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/*
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* Convert from buffer to btree block header.
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*/
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#define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)((bp)->b_addr))
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/*
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* Internal long and short btree block checks. They return NULL if the
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* block is ok or the address of the failed check otherwise.
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*/
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xfs_failaddr_t __xfs_btree_check_lblock(struct xfs_btree_cur *cur,
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struct xfs_btree_block *block, int level, struct xfs_buf *bp);
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xfs_failaddr_t __xfs_btree_check_sblock(struct xfs_btree_cur *cur,
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struct xfs_btree_block *block, int level, struct xfs_buf *bp);
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/*
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* Check that block header is ok.
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*/
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int
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xfs_btree_check_block(
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struct xfs_btree_cur *cur, /* btree cursor */
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struct xfs_btree_block *block, /* generic btree block pointer */
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int level, /* level of the btree block */
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struct xfs_buf *bp); /* buffer containing block, if any */
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/*
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* Check that (long) pointer is ok.
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*/
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bool /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_lptr(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_fsblock_t fsbno, /* btree block disk address */
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int level); /* btree block level */
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/*
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* Check that (short) pointer is ok.
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*/
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bool /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_sptr(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agblock_t agbno, /* btree block disk address */
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int level); /* btree block level */
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/*
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* Delete the btree cursor.
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*/
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void
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xfs_btree_del_cursor(
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xfs_btree_cur_t *cur, /* btree cursor */
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int error); /* del because of error */
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/*
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* Duplicate the btree cursor.
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* Allocate a new one, copy the record, re-get the buffers.
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*/
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int /* error */
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xfs_btree_dup_cursor(
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xfs_btree_cur_t *cur, /* input cursor */
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xfs_btree_cur_t **ncur);/* output cursor */
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/*
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* Get a buffer for the block, return it with no data read.
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* Long-form addressing.
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*/
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struct xfs_buf * /* buffer for fsbno */
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xfs_btree_get_bufl(
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struct xfs_mount *mp, /* file system mount point */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_fsblock_t fsbno); /* file system block number */
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/*
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* Get a buffer for the block, return it with no data read.
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* Short-form addressing.
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*/
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struct xfs_buf * /* buffer for agno/agbno */
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xfs_btree_get_bufs(
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struct xfs_mount *mp, /* file system mount point */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno, /* allocation group number */
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xfs_agblock_t agbno); /* allocation group block number */
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/*
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* Compute first and last byte offsets for the fields given.
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* Interprets the offsets table, which contains struct field offsets.
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*/
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void
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xfs_btree_offsets(
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int64_t fields, /* bitmask of fields */
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const short *offsets,/* table of field offsets */
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int nbits, /* number of bits to inspect */
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int *first, /* output: first byte offset */
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int *last); /* output: last byte offset */
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/*
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* Get a buffer for the block, return it read in.
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* Long-form addressing.
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*/
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int /* error */
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xfs_btree_read_bufl(
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struct xfs_mount *mp, /* file system mount point */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_fsblock_t fsbno, /* file system block number */
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struct xfs_buf **bpp, /* buffer for fsbno */
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int refval, /* ref count value for buffer */
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const struct xfs_buf_ops *ops);
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/*
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* Read-ahead the block, don't wait for it, don't return a buffer.
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* Long-form addressing.
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*/
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void /* error */
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xfs_btree_reada_bufl(
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struct xfs_mount *mp, /* file system mount point */
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xfs_fsblock_t fsbno, /* file system block number */
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xfs_extlen_t count, /* count of filesystem blocks */
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const struct xfs_buf_ops *ops);
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/*
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* Read-ahead the block, don't wait for it, don't return a buffer.
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* Short-form addressing.
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*/
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void /* error */
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xfs_btree_reada_bufs(
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struct xfs_mount *mp, /* file system mount point */
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xfs_agnumber_t agno, /* allocation group number */
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xfs_agblock_t agbno, /* allocation group block number */
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xfs_extlen_t count, /* count of filesystem blocks */
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const struct xfs_buf_ops *ops);
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/*
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* Initialise a new btree block header
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*/
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void
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xfs_btree_init_block(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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xfs_btnum_t btnum,
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__u16 level,
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__u16 numrecs,
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__u64 owner);
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void
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xfs_btree_init_block_int(
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struct xfs_mount *mp,
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struct xfs_btree_block *buf,
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xfs_daddr_t blkno,
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xfs_btnum_t btnum,
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__u16 level,
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__u16 numrecs,
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__u64 owner,
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unsigned int flags);
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/*
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* Common btree core entry points.
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*/
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int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
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int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
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int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
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int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
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int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
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int xfs_btree_insert(struct xfs_btree_cur *, int *);
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int xfs_btree_delete(struct xfs_btree_cur *, int *);
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int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
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int xfs_btree_change_owner(struct xfs_btree_cur *cur, uint64_t new_owner,
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struct list_head *buffer_list);
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/*
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* btree block CRC helpers
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*/
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void xfs_btree_lblock_calc_crc(struct xfs_buf *);
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bool xfs_btree_lblock_verify_crc(struct xfs_buf *);
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void xfs_btree_sblock_calc_crc(struct xfs_buf *);
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bool xfs_btree_sblock_verify_crc(struct xfs_buf *);
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/*
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* Internal btree helpers also used by xfs_bmap.c.
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*/
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void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
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void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int);
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/*
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* Helpers.
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*/
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static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block)
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{
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return be16_to_cpu(block->bb_numrecs);
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}
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static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block,
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uint16_t numrecs)
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{
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block->bb_numrecs = cpu_to_be16(numrecs);
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}
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static inline int xfs_btree_get_level(struct xfs_btree_block *block)
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{
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return be16_to_cpu(block->bb_level);
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}
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/*
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* Min and max functions for extlen, agblock, fileoff, and filblks types.
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*/
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#define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b))
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#define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b))
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#define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b))
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#define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b))
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#define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b))
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#define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b))
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#define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b))
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#define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b))
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xfs_failaddr_t xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp);
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xfs_failaddr_t xfs_btree_sblock_verify(struct xfs_buf *bp,
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unsigned int max_recs);
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xfs_failaddr_t xfs_btree_lblock_v5hdr_verify(struct xfs_buf *bp,
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uint64_t owner);
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xfs_failaddr_t xfs_btree_lblock_verify(struct xfs_buf *bp,
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unsigned int max_recs);
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uint xfs_btree_compute_maxlevels(uint *limits, unsigned long len);
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unsigned long long xfs_btree_calc_size(uint *limits, unsigned long long len);
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/*
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* Return codes for the query range iterator function are 0 to continue
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* iterating, and non-zero to stop iterating. Any non-zero value will be
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* passed up to the _query_range caller. The special value -ECANCELED can be
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* used to stop iteration, because _query_range never generates that error
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* code on its own.
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*/
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typedef int (*xfs_btree_query_range_fn)(struct xfs_btree_cur *cur,
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union xfs_btree_rec *rec, void *priv);
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int xfs_btree_query_range(struct xfs_btree_cur *cur,
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union xfs_btree_irec *low_rec, union xfs_btree_irec *high_rec,
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xfs_btree_query_range_fn fn, void *priv);
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int xfs_btree_query_all(struct xfs_btree_cur *cur, xfs_btree_query_range_fn fn,
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void *priv);
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typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level,
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void *data);
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/* Visit record blocks. */
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#define XFS_BTREE_VISIT_RECORDS (1 << 0)
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/* Visit leaf blocks. */
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#define XFS_BTREE_VISIT_LEAVES (1 << 1)
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/* Visit all blocks. */
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#define XFS_BTREE_VISIT_ALL (XFS_BTREE_VISIT_RECORDS | \
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XFS_BTREE_VISIT_LEAVES)
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int xfs_btree_visit_blocks(struct xfs_btree_cur *cur,
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xfs_btree_visit_blocks_fn fn, unsigned int flags, void *data);
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int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_extlen_t *blocks);
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union xfs_btree_rec *xfs_btree_rec_addr(struct xfs_btree_cur *cur, int n,
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struct xfs_btree_block *block);
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union xfs_btree_key *xfs_btree_key_addr(struct xfs_btree_cur *cur, int n,
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struct xfs_btree_block *block);
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union xfs_btree_key *xfs_btree_high_key_addr(struct xfs_btree_cur *cur, int n,
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struct xfs_btree_block *block);
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union xfs_btree_ptr *xfs_btree_ptr_addr(struct xfs_btree_cur *cur, int n,
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struct xfs_btree_block *block);
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int xfs_btree_lookup_get_block(struct xfs_btree_cur *cur, int level,
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union xfs_btree_ptr *pp, struct xfs_btree_block **blkp);
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struct xfs_btree_block *xfs_btree_get_block(struct xfs_btree_cur *cur,
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int level, struct xfs_buf **bpp);
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bool xfs_btree_ptr_is_null(struct xfs_btree_cur *cur, union xfs_btree_ptr *ptr);
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int64_t xfs_btree_diff_two_ptrs(struct xfs_btree_cur *cur,
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const union xfs_btree_ptr *a,
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const union xfs_btree_ptr *b);
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void xfs_btree_get_sibling(struct xfs_btree_cur *cur,
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struct xfs_btree_block *block,
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union xfs_btree_ptr *ptr, int lr);
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void xfs_btree_get_keys(struct xfs_btree_cur *cur,
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struct xfs_btree_block *block, union xfs_btree_key *key);
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union xfs_btree_key *xfs_btree_high_key_from_key(struct xfs_btree_cur *cur,
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union xfs_btree_key *key);
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int xfs_btree_has_record(struct xfs_btree_cur *cur, union xfs_btree_irec *low,
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union xfs_btree_irec *high, bool *exists);
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bool xfs_btree_has_more_records(struct xfs_btree_cur *cur);
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|
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/* Does this cursor point to the last block in the given level? */
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static inline bool
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xfs_btree_islastblock(
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xfs_btree_cur_t *cur,
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int level)
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{
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struct xfs_btree_block *block;
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struct xfs_buf *bp;
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block = xfs_btree_get_block(cur, level, &bp);
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ASSERT(block && xfs_btree_check_block(cur, block, level, bp) == 0);
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if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
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return block->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK);
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return block->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK);
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}
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#endif /* __XFS_BTREE_H__ */
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