Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 | 2 | * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc. |
f5ea1100 | 3 | * Copyright (c) 2013 Red Hat, Inc. |
7b718769 | 4 | * All Rights Reserved. |
1da177e4 | 5 | * |
7b718769 NS |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
8 | * published by the Free Software Foundation. |
9 | * | |
7b718769 NS |
10 | * This program is distributed in the hope that it would be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
1da177e4 | 14 | * |
7b718769 NS |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write the Free Software Foundation, | |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
18 | */ |
19 | #ifndef __XFS_DA_BTREE_H__ | |
20 | #define __XFS_DA_BTREE_H__ | |
21 | ||
1da177e4 LT |
22 | struct xfs_bmap_free; |
23 | struct xfs_inode; | |
1da177e4 LT |
24 | struct xfs_trans; |
25 | struct zone; | |
26 | ||
27 | /*======================================================================== | |
28 | * Directory Structure when greater than XFS_LBSIZE(mp) bytes. | |
29 | *========================================================================*/ | |
30 | ||
31 | /* | |
32 | * This structure is common to both leaf nodes and non-leaf nodes in the Btree. | |
33 | * | |
96ee34be | 34 | * It is used to manage a doubly linked list of all blocks at the same |
1da177e4 LT |
35 | * level in the Btree, and to identify which type of block this is. |
36 | */ | |
37 | #define XFS_DA_NODE_MAGIC 0xfebe /* magic number: non-leaf blocks */ | |
1da177e4 LT |
38 | #define XFS_ATTR_LEAF_MAGIC 0xfbee /* magic number: attribute leaf blks */ |
39 | #define XFS_DIR2_LEAF1_MAGIC 0xd2f1 /* magic number: v2 dirlf single blks */ | |
40 | #define XFS_DIR2_LEAFN_MAGIC 0xd2ff /* magic number: v2 dirlf multi blks */ | |
41 | ||
1da177e4 | 42 | typedef struct xfs_da_blkinfo { |
89da0544 NS |
43 | __be32 forw; /* previous block in list */ |
44 | __be32 back; /* following block in list */ | |
45 | __be16 magic; /* validity check on block */ | |
46 | __be16 pad; /* unused */ | |
1da177e4 LT |
47 | } xfs_da_blkinfo_t; |
48 | ||
24df33b4 DC |
49 | /* |
50 | * CRC enabled directory structure types | |
51 | * | |
52 | * The headers change size for the additional verification information, but | |
f5ea1100 DC |
53 | * otherwise the tree layouts and contents are unchanged. Hence the da btree |
54 | * code can use the struct xfs_da_blkinfo for manipulating the tree links and | |
55 | * magic numbers without modification for both v2 and v3 nodes. | |
24df33b4 | 56 | */ |
f5ea1100 | 57 | #define XFS_DA3_NODE_MAGIC 0x3ebe /* magic number: non-leaf blocks */ |
24df33b4 DC |
58 | #define XFS_DIR3_LEAF1_MAGIC 0x3df1 /* magic number: v2 dirlf single blks */ |
59 | #define XFS_DIR3_LEAFN_MAGIC 0x3dff /* magic number: v2 dirlf multi blks */ | |
60 | ||
61 | struct xfs_da3_blkinfo { | |
62 | /* | |
63 | * the node link manipulation code relies on the fact that the first | |
64 | * element of this structure is the struct xfs_da_blkinfo so it can | |
65 | * ignore the differences in the rest of the structures. | |
66 | */ | |
67 | struct xfs_da_blkinfo hdr; | |
68 | __be32 crc; /* CRC of block */ | |
69 | __be64 blkno; /* first block of the buffer */ | |
70 | __be64 lsn; /* sequence number of last write */ | |
71 | uuid_t uuid; /* filesystem we belong to */ | |
72 | __be64 owner; /* inode that owns the block */ | |
73 | }; | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * This is the structure of the root and intermediate nodes in the Btree. | |
77 | * The leaf nodes are defined above. | |
78 | * | |
79 | * Entries are not packed. | |
80 | * | |
81 | * Since we have duplicate keys, use a binary search but always follow | |
82 | * all match in the block, not just the first match found. | |
83 | */ | |
84 | #define XFS_DA_NODE_MAXDEPTH 5 /* max depth of Btree */ | |
85 | ||
f5ea1100 DC |
86 | typedef struct xfs_da_node_hdr { |
87 | struct xfs_da_blkinfo info; /* block type, links, etc. */ | |
88 | __be16 count; /* count of active entries */ | |
89 | __be16 __level; /* level above leaves (leaf == 0) */ | |
90 | } xfs_da_node_hdr_t; | |
91 | ||
92 | struct xfs_da3_node_hdr { | |
93 | struct xfs_da3_blkinfo info; /* block type, links, etc. */ | |
94 | __be16 count; /* count of active entries */ | |
95 | __be16 __level; /* level above leaves (leaf == 0) */ | |
96 | __be32 __pad32; | |
97 | }; | |
98 | ||
99 | #define XFS_DA3_NODE_CRC_OFF (offsetof(struct xfs_da3_node_hdr, info.crc)) | |
100 | ||
101 | typedef struct xfs_da_node_entry { | |
102 | __be32 hashval; /* hash value for this descendant */ | |
103 | __be32 before; /* Btree block before this key */ | |
104 | } xfs_da_node_entry_t; | |
105 | ||
1da177e4 | 106 | typedef struct xfs_da_intnode { |
f5ea1100 DC |
107 | struct xfs_da_node_hdr hdr; |
108 | struct xfs_da_node_entry __btree[]; | |
1da177e4 | 109 | } xfs_da_intnode_t; |
f5ea1100 DC |
110 | |
111 | struct xfs_da3_intnode { | |
112 | struct xfs_da3_node_hdr hdr; | |
113 | struct xfs_da_node_entry __btree[]; | |
114 | }; | |
115 | ||
116 | /* | |
117 | * In-core version of the node header to abstract the differences in the v2 and | |
118 | * v3 disk format of the headers. Callers need to convert to/from disk format as | |
119 | * appropriate. | |
120 | */ | |
121 | struct xfs_da3_icnode_hdr { | |
122 | __uint32_t forw; | |
123 | __uint32_t back; | |
124 | __uint16_t magic; | |
125 | __uint16_t count; | |
126 | __uint16_t level; | |
127 | }; | |
128 | ||
129 | extern void xfs_da3_node_hdr_from_disk(struct xfs_da3_icnode_hdr *to, | |
130 | struct xfs_da_intnode *from); | |
131 | extern void xfs_da3_node_hdr_to_disk(struct xfs_da_intnode *to, | |
132 | struct xfs_da3_icnode_hdr *from); | |
133 | ||
134 | static inline int | |
135 | xfs_da3_node_hdr_size(struct xfs_da_intnode *dap) | |
136 | { | |
137 | if (dap->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) | |
138 | return sizeof(struct xfs_da3_node_hdr); | |
139 | return sizeof(struct xfs_da_node_hdr); | |
140 | } | |
141 | ||
142 | static inline struct xfs_da_node_entry * | |
143 | xfs_da3_node_tree_p(struct xfs_da_intnode *dap) | |
144 | { | |
145 | if (dap->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) { | |
146 | struct xfs_da3_intnode *dap3 = (struct xfs_da3_intnode *)dap; | |
147 | return dap3->__btree; | |
148 | } | |
149 | return dap->__btree; | |
150 | } | |
151 | ||
152 | extern void xfs_da3_intnode_from_disk(struct xfs_da3_icnode_hdr *to, | |
153 | struct xfs_da_intnode *from); | |
154 | extern void xfs_da3_intnode_to_disk(struct xfs_da_intnode *to, | |
155 | struct xfs_da3_icnode_hdr *from); | |
1da177e4 | 156 | |
a844f451 | 157 | #define XFS_LBSIZE(mp) (mp)->m_sb.sb_blocksize |
1da177e4 LT |
158 | |
159 | /*======================================================================== | |
160 | * Btree searching and modification structure definitions. | |
161 | *========================================================================*/ | |
162 | ||
5163f95a BN |
163 | /* |
164 | * Search comparison results | |
165 | */ | |
166 | enum xfs_dacmp { | |
167 | XFS_CMP_DIFFERENT, /* names are completely different */ | |
168 | XFS_CMP_EXACT, /* names are exactly the same */ | |
169 | XFS_CMP_CASE /* names are same but differ in case */ | |
170 | }; | |
171 | ||
1da177e4 LT |
172 | /* |
173 | * Structure to ease passing around component names. | |
174 | */ | |
175 | typedef struct xfs_da_args { | |
a5687787 | 176 | const __uint8_t *name; /* string (maybe not NULL terminated) */ |
1da177e4 | 177 | int namelen; /* length of string (maybe no NULL) */ |
a5687787 | 178 | __uint8_t *value; /* set of bytes (maybe contain NULLs) */ |
1da177e4 LT |
179 | int valuelen; /* length of value */ |
180 | int flags; /* argument flags (eg: ATTR_NOCREATE) */ | |
181 | xfs_dahash_t hashval; /* hash value of name */ | |
182 | xfs_ino_t inumber; /* input/output inode number */ | |
183 | struct xfs_inode *dp; /* directory inode to manipulate */ | |
184 | xfs_fsblock_t *firstblock; /* ptr to firstblock for bmap calls */ | |
185 | struct xfs_bmap_free *flist; /* ptr to freelist for bmap_finish */ | |
186 | struct xfs_trans *trans; /* current trans (changes over time) */ | |
187 | xfs_extlen_t total; /* total blocks needed, for 1st bmap */ | |
188 | int whichfork; /* data or attribute fork */ | |
189 | xfs_dablk_t blkno; /* blkno of attr leaf of interest */ | |
190 | int index; /* index of attr of interest in blk */ | |
191 | xfs_dablk_t rmtblkno; /* remote attr value starting blkno */ | |
192 | int rmtblkcnt; /* remote attr value block count */ | |
193 | xfs_dablk_t blkno2; /* blkno of 2nd attr leaf of interest */ | |
194 | int index2; /* index of 2nd attr in blk */ | |
195 | xfs_dablk_t rmtblkno2; /* remote attr value starting blkno */ | |
196 | int rmtblkcnt2; /* remote attr value block count */ | |
6a178100 | 197 | int op_flags; /* operation flags */ |
5163f95a | 198 | enum xfs_dacmp cmpresult; /* name compare result for lookups */ |
1da177e4 LT |
199 | } xfs_da_args_t; |
200 | ||
6a178100 BN |
201 | /* |
202 | * Operation flags: | |
203 | */ | |
204 | #define XFS_DA_OP_JUSTCHECK 0x0001 /* check for ok with no space */ | |
205 | #define XFS_DA_OP_RENAME 0x0002 /* this is an atomic rename op */ | |
206 | #define XFS_DA_OP_ADDNAME 0x0004 /* this is an add operation */ | |
207 | #define XFS_DA_OP_OKNOENT 0x0008 /* lookup/add op, ENOENT ok, else die */ | |
384f3ced | 208 | #define XFS_DA_OP_CILOOKUP 0x0010 /* lookup to return CI name if found */ |
6a178100 | 209 | |
0b1b213f CH |
210 | #define XFS_DA_OP_FLAGS \ |
211 | { XFS_DA_OP_JUSTCHECK, "JUSTCHECK" }, \ | |
212 | { XFS_DA_OP_RENAME, "RENAME" }, \ | |
213 | { XFS_DA_OP_ADDNAME, "ADDNAME" }, \ | |
214 | { XFS_DA_OP_OKNOENT, "OKNOENT" }, \ | |
215 | { XFS_DA_OP_CILOOKUP, "CILOOKUP" } | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * Storage for holding state during Btree searches and split/join ops. | |
219 | * | |
220 | * Only need space for 5 intermediate nodes. With a minimum of 62-way | |
221 | * fanout to the Btree, we can support over 900 million directory blocks, | |
222 | * which is slightly more than enough. | |
223 | */ | |
224 | typedef struct xfs_da_state_blk { | |
1d9025e5 | 225 | struct xfs_buf *bp; /* buffer containing block */ |
1da177e4 LT |
226 | xfs_dablk_t blkno; /* filesystem blkno of buffer */ |
227 | xfs_daddr_t disk_blkno; /* on-disk blkno (in BBs) of buffer */ | |
228 | int index; /* relevant index into block */ | |
229 | xfs_dahash_t hashval; /* last hash value in block */ | |
230 | int magic; /* blk's magic number, ie: blk type */ | |
231 | } xfs_da_state_blk_t; | |
232 | ||
233 | typedef struct xfs_da_state_path { | |
234 | int active; /* number of active levels */ | |
235 | xfs_da_state_blk_t blk[XFS_DA_NODE_MAXDEPTH]; | |
236 | } xfs_da_state_path_t; | |
237 | ||
238 | typedef struct xfs_da_state { | |
239 | xfs_da_args_t *args; /* filename arguments */ | |
240 | struct xfs_mount *mp; /* filesystem mount point */ | |
241 | unsigned int blocksize; /* logical block size */ | |
242 | unsigned int node_ents; /* how many entries in danode */ | |
243 | xfs_da_state_path_t path; /* search/split paths */ | |
244 | xfs_da_state_path_t altpath; /* alternate path for join */ | |
245 | unsigned char inleaf; /* insert into 1->lf, 0->splf */ | |
246 | unsigned char extravalid; /* T/F: extrablk is in use */ | |
247 | unsigned char extraafter; /* T/F: extrablk is after new */ | |
9da096fd | 248 | xfs_da_state_blk_t extrablk; /* for double-splits on leaves */ |
1da177e4 LT |
249 | /* for dirv2 extrablk is data */ |
250 | } xfs_da_state_t; | |
251 | ||
252 | /* | |
253 | * Utility macros to aid in logging changed structure fields. | |
254 | */ | |
255 | #define XFS_DA_LOGOFF(BASE, ADDR) ((char *)(ADDR) - (char *)(BASE)) | |
256 | #define XFS_DA_LOGRANGE(BASE, ADDR, SIZE) \ | |
257 | (uint)(XFS_DA_LOGOFF(BASE, ADDR)), \ | |
258 | (uint)(XFS_DA_LOGOFF(BASE, ADDR)+(SIZE)-1) | |
259 | ||
5163f95a BN |
260 | /* |
261 | * Name ops for directory and/or attr name operations | |
262 | */ | |
263 | struct xfs_nameops { | |
264 | xfs_dahash_t (*hashname)(struct xfs_name *); | |
2bc75421 DC |
265 | enum xfs_dacmp (*compname)(struct xfs_da_args *, |
266 | const unsigned char *, int); | |
5163f95a BN |
267 | }; |
268 | ||
1da177e4 | 269 | |
1da177e4 | 270 | /*======================================================================== |
847fff5c | 271 | * Function prototypes. |
1da177e4 LT |
272 | *========================================================================*/ |
273 | ||
274 | /* | |
275 | * Routines used for growing the Btree. | |
276 | */ | |
f5ea1100 DC |
277 | int xfs_da3_node_create(struct xfs_da_args *args, xfs_dablk_t blkno, |
278 | int level, struct xfs_buf **bpp, int whichfork); | |
279 | int xfs_da3_split(xfs_da_state_t *state); | |
1da177e4 LT |
280 | |
281 | /* | |
282 | * Routines used for shrinking the Btree. | |
283 | */ | |
f5ea1100 DC |
284 | int xfs_da3_join(xfs_da_state_t *state); |
285 | void xfs_da3_fixhashpath(struct xfs_da_state *state, | |
286 | struct xfs_da_state_path *path_to_to_fix); | |
1da177e4 LT |
287 | |
288 | /* | |
289 | * Routines used for finding things in the Btree. | |
290 | */ | |
f5ea1100 DC |
291 | int xfs_da3_node_lookup_int(xfs_da_state_t *state, int *result); |
292 | int xfs_da3_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path, | |
1da177e4 LT |
293 | int forward, int release, int *result); |
294 | /* | |
295 | * Utility routines. | |
296 | */ | |
f5ea1100 | 297 | int xfs_da3_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk, |
1da177e4 | 298 | xfs_da_state_blk_t *new_blk); |
f5ea1100 | 299 | int xfs_da3_node_read(struct xfs_trans *tp, struct xfs_inode *dp, |
d9392a4b DC |
300 | xfs_dablk_t bno, xfs_daddr_t mappedbno, |
301 | struct xfs_buf **bpp, int which_fork); | |
1da177e4 LT |
302 | |
303 | /* | |
304 | * Utility routines. | |
305 | */ | |
306 | int xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno); | |
77936d02 CH |
307 | int xfs_da_grow_inode_int(struct xfs_da_args *args, xfs_fileoff_t *bno, |
308 | int count); | |
1da177e4 LT |
309 | int xfs_da_get_buf(struct xfs_trans *trans, struct xfs_inode *dp, |
310 | xfs_dablk_t bno, xfs_daddr_t mappedbno, | |
1d9025e5 | 311 | struct xfs_buf **bp, int whichfork); |
1da177e4 LT |
312 | int xfs_da_read_buf(struct xfs_trans *trans, struct xfs_inode *dp, |
313 | xfs_dablk_t bno, xfs_daddr_t mappedbno, | |
4bb20a83 | 314 | struct xfs_buf **bpp, int whichfork, |
1813dd64 | 315 | const struct xfs_buf_ops *ops); |
1da177e4 | 316 | xfs_daddr_t xfs_da_reada_buf(struct xfs_trans *trans, struct xfs_inode *dp, |
da6958c8 | 317 | xfs_dablk_t bno, xfs_daddr_t mapped_bno, |
1813dd64 | 318 | int whichfork, const struct xfs_buf_ops *ops); |
1da177e4 | 319 | int xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno, |
1d9025e5 | 320 | struct xfs_buf *dead_buf); |
1da177e4 | 321 | |
a5687787 | 322 | uint xfs_da_hashname(const __uint8_t *name_string, int name_length); |
5163f95a | 323 | enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args, |
2bc75421 | 324 | const unsigned char *name, int len); |
5163f95a BN |
325 | |
326 | ||
1da177e4 LT |
327 | xfs_da_state_t *xfs_da_state_alloc(void); |
328 | void xfs_da_state_free(xfs_da_state_t *state); | |
1da177e4 | 329 | |
1da177e4 | 330 | extern struct kmem_zone *xfs_da_state_zone; |
24418492 | 331 | extern const struct xfs_nameops xfs_default_nameops; |
1da177e4 LT |
332 | |
333 | #endif /* __XFS_DA_BTREE_H__ */ |