zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/xfs/xfs_btree.h b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_btree.h
new file mode 100644
index 0000000..5b240de
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_btree.h
@@ -0,0 +1,455 @@
+/*
+ * 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;
+
+/*
+ * 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)
+
+/*
+ * Generic btree header.
+ *
+ * This is a combination of the actual format used on disk for short and long
+ * format btrees. The first three fields are shared by both format, but
+ * the pointers are different and should be used with care.
+ *
+ * To get the size of the actual short or long form headers please use
+ * the size macros below. Never use sizeof(xfs_btree_block).
+ */
+struct xfs_btree_block {
+ __be32 bb_magic; /* magic number for block type */
+ __be16 bb_level; /* 0 is a leaf */
+ __be16 bb_numrecs; /* current # of data records */
+ union {
+ struct {
+ __be32 bb_leftsib;
+ __be32 bb_rightsib;
+ } s; /* short form pointers */
+ struct {
+ __be64 bb_leftsib;
+ __be64 bb_rightsib;
+ } l; /* long form pointers */
+ } bb_u; /* rest */
+};
+
+#define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */
+#define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */
+
+
+/*
+ * 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;
+};
+
+/*
+ * For logging record fields.
+ */
+#define XFS_BB_MAGIC 0x01
+#define XFS_BB_LEVEL 0x02
+#define XFS_BB_NUMRECS 0x04
+#define XFS_BB_LEFTSIB 0x08
+#define XFS_BB_RIGHTSIB 0x10
+#define XFS_BB_NUM_BITS 5
+#define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1)
+
+/*
+ * Magic numbers for btree blocks.
+ */
+extern const __uint32_t xfs_magics[];
+
+/*
+ * 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_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_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 length, 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);
+
+#ifdef DEBUG
+ /* 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_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_dfsbno_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 */
+
+/*
+ * 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 */
+
+/*
+ * 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 */
+
+
+/*
+ * 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 *);
+
+/*
+ * 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__ */