| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc. |
| * Copyright (c) 2013 Red Hat, Inc. |
| * All Rights Reserved. |
| */ |
| #ifndef __XFS_DA_BTREE_H__ |
| #define __XFS_DA_BTREE_H__ |
| |
| struct xfs_inode; |
| struct xfs_trans; |
| |
| /* |
| * Directory/attribute geometry information. There will be one of these for each |
| * data fork type, and it will be passed around via the xfs_da_args. Global |
| * structures will be attached to the xfs_mount. |
| */ |
| struct xfs_da_geometry { |
| unsigned int blksize; /* da block size in bytes */ |
| unsigned int fsbcount; /* da block size in filesystem blocks */ |
| uint8_t fsblog; /* log2 of _filesystem_ block size */ |
| uint8_t blklog; /* log2 of da block size */ |
| unsigned int node_hdr_size; /* danode header size in bytes */ |
| unsigned int node_ents; /* # of entries in a danode */ |
| unsigned int magicpct; /* 37% of block size in bytes */ |
| xfs_dablk_t datablk; /* blockno of dir data v2 */ |
| unsigned int leaf_hdr_size; /* dir2 leaf header size */ |
| unsigned int leaf_max_ents; /* # of entries in dir2 leaf */ |
| xfs_dablk_t leafblk; /* blockno of leaf data v2 */ |
| unsigned int free_hdr_size; /* dir2 free header size */ |
| unsigned int free_max_bests; /* # of bests entries in dir2 free */ |
| xfs_dablk_t freeblk; /* blockno of free data v2 */ |
| xfs_extnum_t max_extents; /* Max. extents in corresponding fork */ |
| |
| xfs_dir2_data_aoff_t data_first_offset; |
| size_t data_entry_offset; |
| }; |
| |
| /*======================================================================== |
| * Btree searching and modification structure definitions. |
| *========================================================================*/ |
| |
| /* |
| * Search comparison results |
| */ |
| enum xfs_dacmp { |
| XFS_CMP_DIFFERENT, /* names are completely different */ |
| XFS_CMP_EXACT, /* names are exactly the same */ |
| XFS_CMP_CASE /* names are same but differ in case */ |
| }; |
| |
| /* |
| * Structure to ease passing around component names. |
| */ |
| typedef struct xfs_da_args { |
| struct xfs_da_geometry *geo; /* da block geometry */ |
| const uint8_t *name; /* string (maybe not NULL terminated) */ |
| int namelen; /* length of string (maybe no NULL) */ |
| uint8_t filetype; /* filetype of inode for directories */ |
| void *value; /* set of bytes (maybe contain NULLs) */ |
| int valuelen; /* length of value */ |
| unsigned int attr_filter; /* XFS_ATTR_{ROOT,SECURE,INCOMPLETE} */ |
| unsigned int attr_flags; /* XATTR_{CREATE,REPLACE} */ |
| xfs_dahash_t hashval; /* hash value of name */ |
| xfs_ino_t inumber; /* input/output inode number */ |
| struct xfs_inode *dp; /* directory inode to manipulate */ |
| struct xfs_trans *trans; /* current trans (changes over time) */ |
| xfs_extlen_t total; /* total blocks needed, for 1st bmap */ |
| int whichfork; /* data or attribute fork */ |
| xfs_dablk_t blkno; /* blkno of attr leaf of interest */ |
| int index; /* index of attr of interest in blk */ |
| xfs_dablk_t rmtblkno; /* remote attr value starting blkno */ |
| int rmtblkcnt; /* remote attr value block count */ |
| int rmtvaluelen; /* remote attr value length in bytes */ |
| xfs_dablk_t blkno2; /* blkno of 2nd attr leaf of interest */ |
| int index2; /* index of 2nd attr in blk */ |
| xfs_dablk_t rmtblkno2; /* remote attr value starting blkno */ |
| int rmtblkcnt2; /* remote attr value block count */ |
| int rmtvaluelen2; /* remote attr value length in bytes */ |
| uint32_t op_flags; /* operation flags */ |
| enum xfs_dacmp cmpresult; /* name compare result for lookups */ |
| } xfs_da_args_t; |
| |
| /* |
| * Operation flags: |
| */ |
| #define XFS_DA_OP_JUSTCHECK (1u << 0) /* check for ok with no space */ |
| #define XFS_DA_OP_REPLACE (1u << 1) /* this is an atomic replace op */ |
| #define XFS_DA_OP_ADDNAME (1u << 2) /* this is an add operation */ |
| #define XFS_DA_OP_OKNOENT (1u << 3) /* lookup op, ENOENT ok, else die */ |
| #define XFS_DA_OP_CILOOKUP (1u << 4) /* lookup returns CI name if found */ |
| #define XFS_DA_OP_NOTIME (1u << 5) /* don't update inode timestamps */ |
| #define XFS_DA_OP_REMOVE (1u << 6) /* this is a remove operation */ |
| #define XFS_DA_OP_RECOVERY (1u << 7) /* Log recovery operation */ |
| #define XFS_DA_OP_LOGGED (1u << 8) /* Use intent items to track op */ |
| |
| #define XFS_DA_OP_FLAGS \ |
| { XFS_DA_OP_JUSTCHECK, "JUSTCHECK" }, \ |
| { XFS_DA_OP_REPLACE, "REPLACE" }, \ |
| { XFS_DA_OP_ADDNAME, "ADDNAME" }, \ |
| { XFS_DA_OP_OKNOENT, "OKNOENT" }, \ |
| { XFS_DA_OP_CILOOKUP, "CILOOKUP" }, \ |
| { XFS_DA_OP_NOTIME, "NOTIME" }, \ |
| { XFS_DA_OP_REMOVE, "REMOVE" }, \ |
| { XFS_DA_OP_RECOVERY, "RECOVERY" }, \ |
| { XFS_DA_OP_LOGGED, "LOGGED" } |
| |
| /* |
| * Storage for holding state during Btree searches and split/join ops. |
| * |
| * Only need space for 5 intermediate nodes. With a minimum of 62-way |
| * fanout to the Btree, we can support over 900 million directory blocks, |
| * which is slightly more than enough. |
| */ |
| typedef struct xfs_da_state_blk { |
| struct xfs_buf *bp; /* buffer containing block */ |
| xfs_dablk_t blkno; /* filesystem blkno of buffer */ |
| xfs_daddr_t disk_blkno; /* on-disk blkno (in BBs) of buffer */ |
| int index; /* relevant index into block */ |
| xfs_dahash_t hashval; /* last hash value in block */ |
| int magic; /* blk's magic number, ie: blk type */ |
| } xfs_da_state_blk_t; |
| |
| typedef struct xfs_da_state_path { |
| int active; /* number of active levels */ |
| xfs_da_state_blk_t blk[XFS_DA_NODE_MAXDEPTH]; |
| } xfs_da_state_path_t; |
| |
| typedef struct xfs_da_state { |
| xfs_da_args_t *args; /* filename arguments */ |
| struct xfs_mount *mp; /* filesystem mount point */ |
| xfs_da_state_path_t path; /* search/split paths */ |
| xfs_da_state_path_t altpath; /* alternate path for join */ |
| unsigned char inleaf; /* insert into 1->lf, 0->splf */ |
| unsigned char extravalid; /* T/F: extrablk is in use */ |
| unsigned char extraafter; /* T/F: extrablk is after new */ |
| xfs_da_state_blk_t extrablk; /* for double-splits on leaves */ |
| /* for dirv2 extrablk is data */ |
| } xfs_da_state_t; |
| |
| /* |
| * In-core version of the node header to abstract the differences in the v2 and |
| * v3 disk format of the headers. Callers need to convert to/from disk format as |
| * appropriate. |
| */ |
| struct xfs_da3_icnode_hdr { |
| uint32_t forw; |
| uint32_t back; |
| uint16_t magic; |
| uint16_t count; |
| uint16_t level; |
| |
| /* |
| * Pointer to the on-disk format entries, which are behind the |
| * variable size (v4 vs v5) header in the on-disk block. |
| */ |
| struct xfs_da_node_entry *btree; |
| }; |
| |
| /* |
| * Utility macros to aid in logging changed structure fields. |
| */ |
| #define XFS_DA_LOGOFF(BASE, ADDR) ((char *)(ADDR) - (char *)(BASE)) |
| #define XFS_DA_LOGRANGE(BASE, ADDR, SIZE) \ |
| (uint)(XFS_DA_LOGOFF(BASE, ADDR)), \ |
| (uint)(XFS_DA_LOGOFF(BASE, ADDR)+(SIZE)-1) |
| |
| /*======================================================================== |
| * Function prototypes. |
| *========================================================================*/ |
| |
| /* |
| * Routines used for growing the Btree. |
| */ |
| int xfs_da3_node_create(struct xfs_da_args *args, xfs_dablk_t blkno, |
| int level, struct xfs_buf **bpp, int whichfork); |
| int xfs_da3_split(xfs_da_state_t *state); |
| |
| /* |
| * Routines used for shrinking the Btree. |
| */ |
| int xfs_da3_join(xfs_da_state_t *state); |
| void xfs_da3_fixhashpath(struct xfs_da_state *state, |
| struct xfs_da_state_path *path_to_to_fix); |
| |
| /* |
| * Routines used for finding things in the Btree. |
| */ |
| int xfs_da3_node_lookup_int(xfs_da_state_t *state, int *result); |
| int xfs_da3_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path, |
| int forward, int release, int *result); |
| /* |
| * Utility routines. |
| */ |
| int xfs_da3_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk, |
| xfs_da_state_blk_t *new_blk); |
| int xfs_da3_node_read(struct xfs_trans *tp, struct xfs_inode *dp, |
| xfs_dablk_t bno, struct xfs_buf **bpp, int whichfork); |
| int xfs_da3_node_read_mapped(struct xfs_trans *tp, struct xfs_inode *dp, |
| xfs_daddr_t mappedbno, struct xfs_buf **bpp, |
| int whichfork); |
| |
| /* |
| * Utility routines. |
| */ |
| |
| #define XFS_DABUF_MAP_HOLE_OK (1u << 0) |
| |
| int xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno); |
| int xfs_da_grow_inode_int(struct xfs_da_args *args, xfs_fileoff_t *bno, |
| int count); |
| int xfs_da_get_buf(struct xfs_trans *trans, struct xfs_inode *dp, |
| xfs_dablk_t bno, struct xfs_buf **bp, int whichfork); |
| int xfs_da_read_buf(struct xfs_trans *trans, struct xfs_inode *dp, |
| xfs_dablk_t bno, unsigned int flags, struct xfs_buf **bpp, |
| int whichfork, const struct xfs_buf_ops *ops); |
| int xfs_da_reada_buf(struct xfs_inode *dp, xfs_dablk_t bno, |
| unsigned int flags, int whichfork, |
| const struct xfs_buf_ops *ops); |
| int xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno, |
| struct xfs_buf *dead_buf); |
| void xfs_da_buf_copy(struct xfs_buf *dst, struct xfs_buf *src, |
| size_t size); |
| |
| uint xfs_da_hashname(const uint8_t *name_string, int name_length); |
| enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args, |
| const unsigned char *name, int len); |
| |
| |
| struct xfs_da_state *xfs_da_state_alloc(struct xfs_da_args *args); |
| void xfs_da_state_free(xfs_da_state_t *state); |
| void xfs_da_state_reset(struct xfs_da_state *state, struct xfs_da_args *args); |
| |
| void xfs_da3_node_hdr_from_disk(struct xfs_mount *mp, |
| struct xfs_da3_icnode_hdr *to, struct xfs_da_intnode *from); |
| void xfs_da3_node_hdr_to_disk(struct xfs_mount *mp, |
| struct xfs_da_intnode *to, struct xfs_da3_icnode_hdr *from); |
| |
| extern struct kmem_cache *xfs_da_state_cache; |
| |
| #endif /* __XFS_DA_BTREE_H__ */ |