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Linux/fs/xfs/libxfs/xfs_da_btree.h

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
  4  * Copyright (c) 2013 Red Hat, Inc.
  5  * All Rights Reserved.
  6  */
  7 #ifndef __XFS_DA_BTREE_H__
  8 #define __XFS_DA_BTREE_H__
  9 
 10 struct xfs_inode;
 11 struct xfs_trans;
 12 struct zone;
 13 struct xfs_dir_ops;
 14 
 15 /*
 16  * Directory/attribute geometry information. There will be one of these for each
 17  * data fork type, and it will be passed around via the xfs_da_args. Global
 18  * structures will be attached to the xfs_mount.
 19  */
 20 struct xfs_da_geometry {
 21         int             blksize;        /* da block size in bytes */
 22         int             fsbcount;       /* da block size in filesystem blocks */
 23         uint8_t         fsblog;         /* log2 of _filesystem_ block size */
 24         uint8_t         blklog;         /* log2 of da block size */
 25         uint            node_ents;      /* # of entries in a danode */
 26         int             magicpct;       /* 37% of block size in bytes */
 27         xfs_dablk_t     datablk;        /* blockno of dir data v2 */
 28         xfs_dablk_t     leafblk;        /* blockno of leaf data v2 */
 29         xfs_dablk_t     freeblk;        /* blockno of free data v2 */
 30 };
 31 
 32 /*========================================================================
 33  * Btree searching and modification structure definitions.
 34  *========================================================================*/
 35 
 36 /*
 37  * Search comparison results
 38  */
 39 enum xfs_dacmp {
 40         XFS_CMP_DIFFERENT,      /* names are completely different */
 41         XFS_CMP_EXACT,          /* names are exactly the same */
 42         XFS_CMP_CASE            /* names are same but differ in case */
 43 };
 44 
 45 /*
 46  * Structure to ease passing around component names.
 47  */
 48 typedef struct xfs_da_args {
 49         struct xfs_da_geometry *geo;    /* da block geometry */
 50         const uint8_t           *name;          /* string (maybe not NULL terminated) */
 51         int             namelen;        /* length of string (maybe no NULL) */
 52         uint8_t         filetype;       /* filetype of inode for directories */
 53         uint8_t         *value;         /* set of bytes (maybe contain NULLs) */
 54         int             valuelen;       /* length of value */
 55         int             flags;          /* argument flags (eg: ATTR_NOCREATE) */
 56         xfs_dahash_t    hashval;        /* hash value of name */
 57         xfs_ino_t       inumber;        /* input/output inode number */
 58         struct xfs_inode *dp;           /* directory inode to manipulate */
 59         struct xfs_trans *trans;        /* current trans (changes over time) */
 60         xfs_extlen_t    total;          /* total blocks needed, for 1st bmap */
 61         int             whichfork;      /* data or attribute fork */
 62         xfs_dablk_t     blkno;          /* blkno of attr leaf of interest */
 63         int             index;          /* index of attr of interest in blk */
 64         xfs_dablk_t     rmtblkno;       /* remote attr value starting blkno */
 65         int             rmtblkcnt;      /* remote attr value block count */
 66         int             rmtvaluelen;    /* remote attr value length in bytes */
 67         xfs_dablk_t     blkno2;         /* blkno of 2nd attr leaf of interest */
 68         int             index2;         /* index of 2nd attr in blk */
 69         xfs_dablk_t     rmtblkno2;      /* remote attr value starting blkno */
 70         int             rmtblkcnt2;     /* remote attr value block count */
 71         int             rmtvaluelen2;   /* remote attr value length in bytes */
 72         int             op_flags;       /* operation flags */
 73         enum xfs_dacmp  cmpresult;      /* name compare result for lookups */
 74 } xfs_da_args_t;
 75 
 76 /*
 77  * Operation flags:
 78  */
 79 #define XFS_DA_OP_JUSTCHECK     0x0001  /* check for ok with no space */
 80 #define XFS_DA_OP_RENAME        0x0002  /* this is an atomic rename op */
 81 #define XFS_DA_OP_ADDNAME       0x0004  /* this is an add operation */
 82 #define XFS_DA_OP_OKNOENT       0x0008  /* lookup/add op, ENOENT ok, else die */
 83 #define XFS_DA_OP_CILOOKUP      0x0010  /* lookup to return CI name if found */
 84 
 85 #define XFS_DA_OP_FLAGS \
 86         { XFS_DA_OP_JUSTCHECK,  "JUSTCHECK" }, \
 87         { XFS_DA_OP_RENAME,     "RENAME" }, \
 88         { XFS_DA_OP_ADDNAME,    "ADDNAME" }, \
 89         { XFS_DA_OP_OKNOENT,    "OKNOENT" }, \
 90         { XFS_DA_OP_CILOOKUP,   "CILOOKUP" }
 91 
 92 /*
 93  * Storage for holding state during Btree searches and split/join ops.
 94  *
 95  * Only need space for 5 intermediate nodes.  With a minimum of 62-way
 96  * fanout to the Btree, we can support over 900 million directory blocks,
 97  * which is slightly more than enough.
 98  */
 99 typedef struct xfs_da_state_blk {
100         struct xfs_buf  *bp;            /* buffer containing block */
101         xfs_dablk_t     blkno;          /* filesystem blkno of buffer */
102         xfs_daddr_t     disk_blkno;     /* on-disk blkno (in BBs) of buffer */
103         int             index;          /* relevant index into block */
104         xfs_dahash_t    hashval;        /* last hash value in block */
105         int             magic;          /* blk's magic number, ie: blk type */
106 } xfs_da_state_blk_t;
107 
108 typedef struct xfs_da_state_path {
109         int                     active;         /* number of active levels */
110         xfs_da_state_blk_t      blk[XFS_DA_NODE_MAXDEPTH];
111 } xfs_da_state_path_t;
112 
113 typedef struct xfs_da_state {
114         xfs_da_args_t           *args;          /* filename arguments */
115         struct xfs_mount        *mp;            /* filesystem mount point */
116         xfs_da_state_path_t     path;           /* search/split paths */
117         xfs_da_state_path_t     altpath;        /* alternate path for join */
118         unsigned char           inleaf;         /* insert into 1->lf, 0->splf */
119         unsigned char           extravalid;     /* T/F: extrablk is in use */
120         unsigned char           extraafter;     /* T/F: extrablk is after new */
121         xfs_da_state_blk_t      extrablk;       /* for double-splits on leaves */
122                                                 /* for dirv2 extrablk is data */
123 } xfs_da_state_t;
124 
125 /*
126  * Utility macros to aid in logging changed structure fields.
127  */
128 #define XFS_DA_LOGOFF(BASE, ADDR)       ((char *)(ADDR) - (char *)(BASE))
129 #define XFS_DA_LOGRANGE(BASE, ADDR, SIZE)       \
130                 (uint)(XFS_DA_LOGOFF(BASE, ADDR)), \
131                 (uint)(XFS_DA_LOGOFF(BASE, ADDR)+(SIZE)-1)
132 
133 /*
134  * Name ops for directory and/or attr name operations
135  */
136 struct xfs_nameops {
137         xfs_dahash_t    (*hashname)(struct xfs_name *);
138         enum xfs_dacmp  (*compname)(struct xfs_da_args *,
139                                         const unsigned char *, int);
140 };
141 
142 
143 /*========================================================================
144  * Function prototypes.
145  *========================================================================*/
146 
147 /*
148  * Routines used for growing the Btree.
149  */
150 int     xfs_da3_node_create(struct xfs_da_args *args, xfs_dablk_t blkno,
151                             int level, struct xfs_buf **bpp, int whichfork);
152 int     xfs_da3_split(xfs_da_state_t *state);
153 
154 /*
155  * Routines used for shrinking the Btree.
156  */
157 int     xfs_da3_join(xfs_da_state_t *state);
158 void    xfs_da3_fixhashpath(struct xfs_da_state *state,
159                             struct xfs_da_state_path *path_to_to_fix);
160 
161 /*
162  * Routines used for finding things in the Btree.
163  */
164 int     xfs_da3_node_lookup_int(xfs_da_state_t *state, int *result);
165 int     xfs_da3_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path,
166                                          int forward, int release, int *result);
167 /*
168  * Utility routines.
169  */
170 int     xfs_da3_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk,
171                                        xfs_da_state_blk_t *new_blk);
172 int     xfs_da3_node_read(struct xfs_trans *tp, struct xfs_inode *dp,
173                          xfs_dablk_t bno, xfs_daddr_t mappedbno,
174                          struct xfs_buf **bpp, int which_fork);
175 
176 /*
177  * Utility routines.
178  */
179 int     xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno);
180 int     xfs_da_grow_inode_int(struct xfs_da_args *args, xfs_fileoff_t *bno,
181                               int count);
182 int     xfs_da_get_buf(struct xfs_trans *trans, struct xfs_inode *dp,
183                               xfs_dablk_t bno, xfs_daddr_t mappedbno,
184                               struct xfs_buf **bp, int whichfork);
185 int     xfs_da_read_buf(struct xfs_trans *trans, struct xfs_inode *dp,
186                                xfs_dablk_t bno, xfs_daddr_t mappedbno,
187                                struct xfs_buf **bpp, int whichfork,
188                                const struct xfs_buf_ops *ops);
189 int     xfs_da_reada_buf(struct xfs_inode *dp, xfs_dablk_t bno,
190                                 xfs_daddr_t mapped_bno, int whichfork,
191                                 const struct xfs_buf_ops *ops);
192 int     xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
193                                           struct xfs_buf *dead_buf);
194 
195 uint xfs_da_hashname(const uint8_t *name_string, int name_length);
196 enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args,
197                                 const unsigned char *name, int len);
198 
199 
200 xfs_da_state_t *xfs_da_state_alloc(void);
201 void xfs_da_state_free(xfs_da_state_t *state);
202 
203 extern struct kmem_zone *xfs_da_state_zone;
204 extern const struct xfs_nameops xfs_default_nameops;
205 
206 #endif  /* __XFS_DA_BTREE_H__ */
207 

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