diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_btree.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_btree.h | 468 |
1 files changed, 468 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h new file mode 100644 index 000000000..8f18bab73 --- /dev/null +++ b/fs/xfs/libxfs/xfs_btree.h @@ -0,0 +1,468 @@ +/* + * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef __XFS_BTREE_H__ +#define __XFS_BTREE_H__ + +struct xfs_buf; +struct xfs_bmap_free; +struct xfs_inode; +struct xfs_mount; +struct xfs_trans; + +extern kmem_zone_t *xfs_btree_cur_zone; + +/* + * Generic key, ptr and record wrapper structures. + * + * These are disk format structures, and are converted where necessary + * by the btree specific code that needs to interpret them. + */ +union xfs_btree_ptr { + __be32 s; /* short form ptr */ + __be64 l; /* long form ptr */ +}; + +union xfs_btree_key { + xfs_bmbt_key_t bmbt; + xfs_bmdr_key_t bmbr; /* bmbt root block */ + xfs_alloc_key_t alloc; + xfs_inobt_key_t inobt; +}; + +union xfs_btree_rec { + xfs_bmbt_rec_t bmbt; + xfs_bmdr_rec_t bmbr; /* bmbt root block */ + xfs_alloc_rec_t alloc; + xfs_inobt_rec_t inobt; +}; + +/* + * This nonsense is to make -wlint happy. + */ +#define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi) +#define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi) +#define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi) + +#define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi) +#define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi) +#define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi) +#define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi) +#define XFS_BTNUM_FINO ((xfs_btnum_t)XFS_BTNUM_FINOi) + +/* + * For logging record fields. + */ +#define XFS_BB_MAGIC (1 << 0) +#define XFS_BB_LEVEL (1 << 1) +#define XFS_BB_NUMRECS (1 << 2) +#define XFS_BB_LEFTSIB (1 << 3) +#define XFS_BB_RIGHTSIB (1 << 4) +#define XFS_BB_BLKNO (1 << 5) +#define XFS_BB_LSN (1 << 6) +#define XFS_BB_UUID (1 << 7) +#define XFS_BB_OWNER (1 << 8) +#define XFS_BB_NUM_BITS 5 +#define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1) +#define XFS_BB_NUM_BITS_CRC 9 +#define XFS_BB_ALL_BITS_CRC ((1 << XFS_BB_NUM_BITS_CRC) - 1) + +/* + * Generic stats interface + */ +#define __XFS_BTREE_STATS_INC(type, stat) \ + XFS_STATS_INC(xs_ ## type ## _2_ ## stat) +#define XFS_BTREE_STATS_INC(cur, stat) \ +do { \ + switch (cur->bc_btnum) { \ + case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(abtb, stat); break; \ + case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(abtc, stat); break; \ + case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(bmbt, stat); break; \ + case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(ibt, stat); break; \ + case XFS_BTNUM_FINO: __XFS_BTREE_STATS_INC(fibt, stat); break; \ + case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ + } \ +} while (0) + +#define __XFS_BTREE_STATS_ADD(type, stat, val) \ + XFS_STATS_ADD(xs_ ## type ## _2_ ## stat, val) +#define XFS_BTREE_STATS_ADD(cur, stat, val) \ +do { \ + switch (cur->bc_btnum) { \ + case XFS_BTNUM_BNO: __XFS_BTREE_STATS_ADD(abtb, stat, val); break; \ + case XFS_BTNUM_CNT: __XFS_BTREE_STATS_ADD(abtc, stat, val); break; \ + case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_ADD(bmbt, stat, val); break; \ + case XFS_BTNUM_INO: __XFS_BTREE_STATS_ADD(ibt, stat, val); break; \ + case XFS_BTNUM_FINO: __XFS_BTREE_STATS_ADD(fibt, stat, val); break; \ + case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ + } \ +} while (0) + +#define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */ + +struct xfs_btree_ops { + /* size of the key and record structures */ + size_t key_len; + size_t rec_len; + + /* cursor operations */ + struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *); + void (*update_cursor)(struct xfs_btree_cur *src, + struct xfs_btree_cur *dst); + + /* update btree root pointer */ + void (*set_root)(struct xfs_btree_cur *cur, + union xfs_btree_ptr *nptr, int level_change); + + /* block allocation / freeing */ + int (*alloc_block)(struct xfs_btree_cur *cur, + union xfs_btree_ptr *start_bno, + union xfs_btree_ptr *new_bno, + int *stat); + int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp); + + /* update last record information */ + void (*update_lastrec)(struct xfs_btree_cur *cur, + struct xfs_btree_block *block, + union xfs_btree_rec *rec, + int ptr, int reason); + + /* records in block/level */ + int (*get_minrecs)(struct xfs_btree_cur *cur, int level); + int (*get_maxrecs)(struct xfs_btree_cur *cur, int level); + + /* records on disk. Matter for the root in inode case. */ + int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level); + + /* init values of btree structures */ + void (*init_key_from_rec)(union xfs_btree_key *key, + union xfs_btree_rec *rec); + void (*init_rec_from_key)(union xfs_btree_key *key, + union xfs_btree_rec *rec); + void (*init_rec_from_cur)(struct xfs_btree_cur *cur, + union xfs_btree_rec *rec); + void (*init_ptr_from_cur)(struct xfs_btree_cur *cur, + union xfs_btree_ptr *ptr); + + /* difference between key value and cursor value */ + __int64_t (*key_diff)(struct xfs_btree_cur *cur, + union xfs_btree_key *key); + + const struct xfs_buf_ops *buf_ops; + +#if defined(DEBUG) || defined(XFS_WARN) + /* check that k1 is lower than k2 */ + int (*keys_inorder)(struct xfs_btree_cur *cur, + union xfs_btree_key *k1, + union xfs_btree_key *k2); + + /* check that r1 is lower than r2 */ + int (*recs_inorder)(struct xfs_btree_cur *cur, + union xfs_btree_rec *r1, + union xfs_btree_rec *r2); +#endif +}; + +/* + * Reasons for the update_lastrec method to be called. + */ +#define LASTREC_UPDATE 0 +#define LASTREC_INSREC 1 +#define LASTREC_DELREC 2 + + +/* + * Btree cursor structure. + * This collects all information needed by the btree code in one place. + */ +typedef struct xfs_btree_cur +{ + struct xfs_trans *bc_tp; /* transaction we're in, if any */ + struct xfs_mount *bc_mp; /* file system mount struct */ + const struct xfs_btree_ops *bc_ops; + uint bc_flags; /* btree features - below */ + union { + xfs_alloc_rec_incore_t a; + xfs_bmbt_irec_t b; + xfs_inobt_rec_incore_t i; + } bc_rec; /* current insert/search record value */ + struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */ + int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */ + __uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */ +#define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */ +#define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */ + __uint8_t bc_nlevels; /* number of levels in the tree */ + __uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */ + xfs_btnum_t bc_btnum; /* identifies which btree type */ + union { + struct { /* needed for BNO, CNT, INO */ + struct xfs_buf *agbp; /* agf/agi buffer pointer */ + xfs_agnumber_t agno; /* ag number */ + } a; + struct { /* needed for BMAP */ + struct xfs_inode *ip; /* pointer to our inode */ + struct xfs_bmap_free *flist; /* list to free after */ + xfs_fsblock_t firstblock; /* 1st blk allocated */ + int allocated; /* count of alloced */ + short forksize; /* fork's inode space */ + char whichfork; /* data or attr fork */ + char flags; /* flags */ +#define XFS_BTCUR_BPRV_WASDEL 1 /* was delayed */ + } b; + } bc_private; /* per-btree type data */ +} xfs_btree_cur_t; + +/* cursor flags */ +#define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */ +#define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */ +#define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */ +#define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */ + + +#define XFS_BTREE_NOERROR 0 +#define XFS_BTREE_ERROR 1 + +/* + * Convert from buffer to btree block header. + */ +#define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)((bp)->b_addr)) + + +/* + * Check that block header is ok. + */ +int +xfs_btree_check_block( + struct xfs_btree_cur *cur, /* btree cursor */ + struct xfs_btree_block *block, /* generic btree block pointer */ + int level, /* level of the btree block */ + struct xfs_buf *bp); /* buffer containing block, if any */ + +/* + * Check that (long) pointer is ok. + */ +int /* error (0 or EFSCORRUPTED) */ +xfs_btree_check_lptr( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_fsblock_t ptr, /* btree block disk address */ + int level); /* btree block level */ + +/* + * Delete the btree cursor. + */ +void +xfs_btree_del_cursor( + xfs_btree_cur_t *cur, /* btree cursor */ + int error); /* del because of error */ + +/* + * Duplicate the btree cursor. + * Allocate a new one, copy the record, re-get the buffers. + */ +int /* error */ +xfs_btree_dup_cursor( + xfs_btree_cur_t *cur, /* input cursor */ + xfs_btree_cur_t **ncur);/* output cursor */ + +/* + * Get a buffer for the block, return it with no data read. + * Long-form addressing. + */ +struct xfs_buf * /* buffer for fsbno */ +xfs_btree_get_bufl( + struct xfs_mount *mp, /* file system mount point */ + struct xfs_trans *tp, /* transaction pointer */ + xfs_fsblock_t fsbno, /* file system block number */ + uint lock); /* lock flags for get_buf */ + +/* + * Get a buffer for the block, return it with no data read. + * Short-form addressing. + */ +struct xfs_buf * /* buffer for agno/agbno */ +xfs_btree_get_bufs( + struct xfs_mount *mp, /* file system mount point */ + struct xfs_trans *tp, /* transaction pointer */ + xfs_agnumber_t agno, /* allocation group number */ + xfs_agblock_t agbno, /* allocation group block number */ + uint lock); /* lock flags for get_buf */ + +/* + * Check for the cursor referring to the last block at the given level. + */ +int /* 1=is last block, 0=not last block */ +xfs_btree_islastblock( + xfs_btree_cur_t *cur, /* btree cursor */ + int level); /* level to check */ + +/* + * Compute first and last byte offsets for the fields given. + * Interprets the offsets table, which contains struct field offsets. + */ +void +xfs_btree_offsets( + __int64_t fields, /* bitmask of fields */ + const short *offsets,/* table of field offsets */ + int nbits, /* number of bits to inspect */ + int *first, /* output: first byte offset */ + int *last); /* output: last byte offset */ + +/* + * Get a buffer for the block, return it read in. + * Long-form addressing. + */ +int /* error */ +xfs_btree_read_bufl( + struct xfs_mount *mp, /* file system mount point */ + struct xfs_trans *tp, /* transaction pointer */ + xfs_fsblock_t fsbno, /* file system block number */ + uint lock, /* lock flags for read_buf */ + struct xfs_buf **bpp, /* buffer for fsbno */ + int refval, /* ref count value for buffer */ + const struct xfs_buf_ops *ops); + +/* + * Read-ahead the block, don't wait for it, don't return a buffer. + * Long-form addressing. + */ +void /* error */ +xfs_btree_reada_bufl( + struct xfs_mount *mp, /* file system mount point */ + xfs_fsblock_t fsbno, /* file system block number */ + xfs_extlen_t count, /* count of filesystem blocks */ + const struct xfs_buf_ops *ops); + +/* + * Read-ahead the block, don't wait for it, don't return a buffer. + * Short-form addressing. + */ +void /* error */ +xfs_btree_reada_bufs( + struct xfs_mount *mp, /* file system mount point */ + xfs_agnumber_t agno, /* allocation group number */ + xfs_agblock_t agbno, /* allocation group block number */ + xfs_extlen_t count, /* count of filesystem blocks */ + const struct xfs_buf_ops *ops); + +/* + * Initialise a new btree block header + */ +void +xfs_btree_init_block( + struct xfs_mount *mp, + struct xfs_buf *bp, + __u32 magic, + __u16 level, + __u16 numrecs, + __u64 owner, + unsigned int flags); + +void +xfs_btree_init_block_int( + struct xfs_mount *mp, + struct xfs_btree_block *buf, + xfs_daddr_t blkno, + __u32 magic, + __u16 level, + __u16 numrecs, + __u64 owner, + unsigned int flags); + +/* + * Common btree core entry points. + */ +int xfs_btree_increment(struct xfs_btree_cur *, int, int *); +int xfs_btree_decrement(struct xfs_btree_cur *, int, int *); +int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *); +int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *); +int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *); +int xfs_btree_insert(struct xfs_btree_cur *, int *); +int xfs_btree_delete(struct xfs_btree_cur *, int *); +int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *); +int xfs_btree_change_owner(struct xfs_btree_cur *cur, __uint64_t new_owner, + struct list_head *buffer_list); + +/* + * btree block CRC helpers + */ +void xfs_btree_lblock_calc_crc(struct xfs_buf *); +bool xfs_btree_lblock_verify_crc(struct xfs_buf *); +void xfs_btree_sblock_calc_crc(struct xfs_buf *); +bool xfs_btree_sblock_verify_crc(struct xfs_buf *); + +/* + * Internal btree helpers also used by xfs_bmap.c. + */ +void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int); +void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int); + +/* + * Helpers. + */ +static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block) +{ + return be16_to_cpu(block->bb_numrecs); +} + +static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block, + __uint16_t numrecs) +{ + block->bb_numrecs = cpu_to_be16(numrecs); +} + +static inline int xfs_btree_get_level(struct xfs_btree_block *block) +{ + return be16_to_cpu(block->bb_level); +} + + +/* + * Min and max functions for extlen, agblock, fileoff, and filblks types. + */ +#define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b)) +#define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b)) +#define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b)) +#define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b)) +#define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b)) +#define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b)) +#define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b)) +#define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b)) + +#define XFS_FSB_SANITY_CHECK(mp,fsb) \ + (XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \ + XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks) + +/* + * Trace hooks. Currently not implemented as they need to be ported + * over to the generic tracing functionality, which is some effort. + * + * i,j = integer (32 bit) + * b = btree block buffer (xfs_buf_t) + * p = btree ptr + * r = btree record + * k = btree key + */ +#define XFS_BTREE_TRACE_ARGBI(c, b, i) +#define XFS_BTREE_TRACE_ARGBII(c, b, i, j) +#define XFS_BTREE_TRACE_ARGI(c, i) +#define XFS_BTREE_TRACE_ARGIPK(c, i, p, s) +#define XFS_BTREE_TRACE_ARGIPR(c, i, p, r) +#define XFS_BTREE_TRACE_ARGIK(c, i, k) +#define XFS_BTREE_TRACE_ARGR(c, r) +#define XFS_BTREE_TRACE_CURSOR(c, t) + +#endif /* __XFS_BTREE_H__ */ |