Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * Copyright (C) 2022-2023 Oracle. All Rights Reserved.
4 : * Author: Darrick J. Wong <djwong@kernel.org>
5 : */
6 : #include "xfs.h"
7 : #include "xfs_fs.h"
8 : #include "xfs_shared.h"
9 : #include "xfs_format.h"
10 : #include "xfs_log_format.h"
11 : #include "xfs_trans_resv.h"
12 : #include "xfs_mount.h"
13 : #include "xfs_inode.h"
14 : #include "xfs_dir2.h"
15 : #include "xfs_dir2_priv.h"
16 : #include "xfs_trace.h"
17 : #include "xfs_bmap.h"
18 : #include "xfs_trans.h"
19 : #include "xfs_error.h"
20 : #include "scrub/scrub.h"
21 : #include "scrub/readdir.h"
22 :
23 : /* Call a function for every entry in a shortform directory. */
24 : STATIC int
25 177275104 : xchk_dir_walk_sf(
26 : struct xfs_scrub *sc,
27 : struct xfs_inode *dp,
28 : xchk_dirent_fn dirent_fn,
29 : void *priv)
30 : {
31 177275104 : struct xfs_name name = {
32 : .name = ".",
33 : .len = 1,
34 : .type = XFS_DIR3_FT_DIR,
35 : };
36 177275104 : struct xfs_mount *mp = dp->i_mount;
37 177275104 : struct xfs_da_geometry *geo = mp->m_dir_geo;
38 177275104 : struct xfs_dir2_sf_entry *sfep;
39 177275104 : struct xfs_dir2_sf_hdr *sfp;
40 177275104 : xfs_ino_t ino;
41 177275104 : xfs_dir2_dataptr_t dapos;
42 177275104 : unsigned int i;
43 177275104 : int error;
44 :
45 177275104 : ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
46 177275104 : ASSERT(dp->i_df.if_u1.if_data != NULL);
47 :
48 177275104 : sfp = (struct xfs_dir2_sf_hdr *)dp->i_df.if_u1.if_data;
49 :
50 : /* dot entry */
51 177275104 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
52 177275104 : geo->data_entry_offset);
53 :
54 177250322 : error = dirent_fn(sc, dp, dapos, &name, dp->i_ino, priv);
55 177338308 : if (error)
56 : return error;
57 :
58 : /* dotdot entry */
59 177341825 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
60 177341825 : geo->data_entry_offset +
61 : xfs_dir2_data_entsize(mp, sizeof(".") - 1));
62 177338525 : ino = xfs_dir2_sf_get_parent_ino(sfp);
63 177324869 : name.name = "..";
64 177324869 : name.len = 2;
65 :
66 177324869 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
67 177385691 : if (error)
68 : return error;
69 :
70 : /* iterate everything else */
71 177385691 : sfep = xfs_dir2_sf_firstentry(sfp);
72 972174864 : for (i = 0; i < sfp->count; i++) {
73 794773143 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
74 : xfs_dir2_sf_get_offset(sfep));
75 794800867 : ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
76 794712879 : name.name = sfep->name;
77 794712879 : name.len = sfep->namelen;
78 794712879 : name.type = xfs_dir2_sf_get_ftype(mp, sfep);
79 :
80 794683167 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
81 794801467 : if (error)
82 13 : return error;
83 :
84 794801454 : sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
85 : }
86 :
87 : return 0;
88 : }
89 :
90 : /* Call a function for every entry in a block directory. */
91 : STATIC int
92 854450 : xchk_dir_walk_block(
93 : struct xfs_scrub *sc,
94 : struct xfs_inode *dp,
95 : xchk_dirent_fn dirent_fn,
96 : void *priv)
97 : {
98 854450 : struct xfs_mount *mp = dp->i_mount;
99 854450 : struct xfs_da_geometry *geo = mp->m_dir_geo;
100 854450 : struct xfs_buf *bp;
101 854450 : unsigned int off, next_off, end;
102 854450 : int error;
103 :
104 854450 : error = xfs_dir3_block_read(sc->tp, dp, &bp);
105 854486 : if (error)
106 : return error;
107 :
108 : /* Walk each directory entry. */
109 854486 : end = xfs_dir3_data_end_offset(geo, bp->b_addr);
110 28328160 : for (off = geo->data_entry_offset; off < end; off = next_off) {
111 27473648 : struct xfs_name name = { };
112 27473648 : struct xfs_dir2_data_unused *dup = bp->b_addr + off;
113 27473648 : struct xfs_dir2_data_entry *dep = bp->b_addr + off;
114 27473648 : xfs_ino_t ino;
115 27473648 : xfs_dir2_dataptr_t dapos;
116 :
117 : /* Skip an empty entry. */
118 27473648 : if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
119 6701418 : next_off = off + be16_to_cpu(dup->length);
120 6701418 : continue;
121 : }
122 :
123 : /* Otherwise, find the next entry and report it. */
124 20772230 : next_off = off + xfs_dir2_data_entsize(mp, dep->namelen);
125 20772230 : if (next_off > end)
126 : break;
127 :
128 20772230 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, off);
129 20771622 : ino = be64_to_cpu(dep->inumber);
130 20771622 : name.name = dep->name;
131 20771622 : name.len = dep->namelen;
132 20771622 : name.type = xfs_dir2_data_get_ftype(mp, dep);
133 :
134 20771797 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
135 20772257 : if (error)
136 : break;
137 : }
138 :
139 854512 : xfs_trans_brelse(sc->tp, bp);
140 854512 : return error;
141 : }
142 :
143 : /* Read a leaf-format directory buffer. */
144 : STATIC int
145 16551214 : xchk_read_leaf_dir_buf(
146 : struct xfs_trans *tp,
147 : struct xfs_inode *dp,
148 : struct xfs_da_geometry *geo,
149 : xfs_dir2_off_t *curoff,
150 : struct xfs_buf **bpp)
151 : {
152 16551214 : struct xfs_iext_cursor icur;
153 16551214 : struct xfs_bmbt_irec map;
154 16551214 : struct xfs_ifork *ifp = xfs_ifork_ptr(dp, XFS_DATA_FORK);
155 16551214 : xfs_dablk_t last_da;
156 16551214 : xfs_dablk_t map_off;
157 16551214 : xfs_dir2_off_t new_off;
158 :
159 16551214 : *bpp = NULL;
160 :
161 : /*
162 : * Look for mapped directory blocks at or above the current offset.
163 : * Truncate down to the nearest directory block to start the scanning
164 : * operation.
165 : */
166 16551214 : last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET);
167 16446372 : map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *curoff));
168 :
169 16461175 : if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map))
170 : return 0;
171 16445264 : if (map.br_startoff >= last_da)
172 : return 0;
173 15925762 : xfs_trim_extent(&map, map_off, last_da - map_off);
174 :
175 : /* Read the directory block of that first mapping. */
176 15912747 : new_off = xfs_dir2_da_to_byte(geo, map.br_startoff);
177 15957063 : if (new_off > *curoff)
178 10255 : *curoff = new_off;
179 :
180 15957063 : return xfs_dir3_data_read(tp, dp, map.br_startoff, 0, bpp);
181 : }
182 :
183 : /* Call a function for every entry in a leaf directory. */
184 : STATIC int
185 531730 : xchk_dir_walk_leaf(
186 : struct xfs_scrub *sc,
187 : struct xfs_inode *dp,
188 : xchk_dirent_fn dirent_fn,
189 : void *priv)
190 : {
191 531730 : struct xfs_mount *mp = dp->i_mount;
192 531730 : struct xfs_da_geometry *geo = mp->m_dir_geo;
193 531730 : struct xfs_buf *bp = NULL;
194 531730 : xfs_dir2_off_t curoff = 0;
195 531730 : unsigned int offset = 0;
196 531730 : int error;
197 :
198 : /* Iterate every directory offset in this directory. */
199 2738370823 : while (curoff < XFS_DIR2_LEAF_OFFSET) {
200 2738370823 : struct xfs_name name = { };
201 2738370823 : struct xfs_dir2_data_unused *dup;
202 2738370823 : struct xfs_dir2_data_entry *dep;
203 2738370823 : xfs_ino_t ino;
204 2738370823 : unsigned int length;
205 2738370823 : xfs_dir2_dataptr_t dapos;
206 :
207 : /*
208 : * If we have no buffer, or we're off the end of the
209 : * current buffer, need to get another one.
210 : */
211 2738370823 : if (!bp || offset >= geo->blksize) {
212 16737251 : if (bp) {
213 16205738 : xfs_trans_brelse(sc->tp, bp);
214 16244419 : bp = NULL;
215 : }
216 :
217 16775932 : error = xchk_read_leaf_dir_buf(sc->tp, dp, geo, &curoff,
218 : &bp);
219 16406826 : if (error || !bp)
220 : break;
221 :
222 : /*
223 : * Find our position in the block.
224 : */
225 15874839 : offset = geo->data_entry_offset;
226 15874839 : curoff += geo->data_entry_offset;
227 : }
228 :
229 : /* Skip an empty entry. */
230 2737508411 : dup = bp->b_addr + offset;
231 2737508411 : if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
232 1386247543 : length = be16_to_cpu(dup->length);
233 1386247543 : offset += length;
234 1386247543 : curoff += length;
235 1386247543 : continue;
236 : }
237 :
238 : /* Otherwise, find the next entry and report it. */
239 1351260868 : dep = bp->b_addr + offset;
240 1351260868 : length = xfs_dir2_data_entsize(mp, dep->namelen);
241 :
242 1351260868 : dapos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff;
243 1351260868 : ino = be64_to_cpu(dep->inumber);
244 1351260868 : name.name = dep->name;
245 1351260868 : name.len = dep->namelen;
246 1351260868 : name.type = xfs_dir2_data_get_ftype(mp, dep);
247 :
248 1558608648 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
249 1351591575 : if (error)
250 : break;
251 :
252 : /* Advance to the next entry. */
253 1351591550 : offset += length;
254 1351591550 : curoff += length;
255 : }
256 :
257 532012 : if (bp)
258 25 : xfs_trans_brelse(sc->tp, bp);
259 532012 : return error;
260 : }
261 :
262 : /*
263 : * Call a function for every entry in a directory.
264 : *
265 : * Callers must hold the ILOCK. File types are XFS_DIR3_FT_*.
266 : */
267 : int
268 178710058 : xchk_dir_walk(
269 : struct xfs_scrub *sc,
270 : struct xfs_inode *dp,
271 : xchk_dirent_fn dirent_fn,
272 : void *priv)
273 : {
274 178710058 : struct xfs_da_args args = {
275 : .dp = dp,
276 178710058 : .geo = dp->i_mount->m_dir_geo,
277 178710058 : .trans = sc->tp,
278 : };
279 178710058 : bool isblock;
280 178710058 : int error;
281 :
282 357420116 : if (xfs_is_shutdown(dp->i_mount))
283 : return -EIO;
284 :
285 178710058 : ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
286 178710058 : ASSERT(xfs_isilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
287 :
288 178626900 : if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
289 177240788 : return xchk_dir_walk_sf(sc, dp, dirent_fn, priv);
290 :
291 : /* dir2 functions require that the data fork is loaded */
292 1386112 : error = xfs_iread_extents(sc->tp, dp, XFS_DATA_FORK);
293 1386195 : if (error)
294 : return error;
295 :
296 1386203 : error = xfs_dir2_isblock(&args, &isblock);
297 1386049 : if (error)
298 : return error;
299 :
300 1386049 : if (isblock)
301 854458 : return xchk_dir_walk_block(sc, dp, dirent_fn, priv);
302 :
303 531591 : return xchk_dir_walk_leaf(sc, dp, dirent_fn, priv);
304 : }
305 :
306 : /*
307 : * Look up the inode number for an exact name in a directory.
308 : *
309 : * Callers must hold the ILOCK. File types are XFS_DIR3_FT_*. Names are not
310 : * checked for correctness.
311 : */
312 : int
313 779032974 : xchk_dir_lookup(
314 : struct xfs_scrub *sc,
315 : struct xfs_inode *dp,
316 : const struct xfs_name *name,
317 : xfs_ino_t *ino)
318 : {
319 1557557876 : struct xfs_da_args args = {
320 : .dp = dp,
321 779032974 : .geo = dp->i_mount->m_dir_geo,
322 778524902 : .trans = sc->tp,
323 779032974 : .name = name->name,
324 779032974 : .namelen = name->len,
325 779032974 : .filetype = name->type,
326 779032974 : .hashval = xfs_dir2_hashname(dp->i_mount, name),
327 : .whichfork = XFS_DATA_FORK,
328 : .op_flags = XFS_DA_OP_OKNOENT,
329 : };
330 778524902 : bool isblock, isleaf;
331 778524902 : int error;
332 :
333 1557049804 : if (xfs_is_shutdown(dp->i_mount))
334 : return -EIO;
335 :
336 778524902 : ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
337 778524902 : ASSERT(xfs_isilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
338 :
339 777868182 : if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
340 656336984 : error = xfs_dir2_sf_lookup(&args);
341 656052154 : goto out_check_rval;
342 : }
343 :
344 : /* dir2 functions require that the data fork is loaded */
345 121531198 : error = xfs_iread_extents(sc->tp, dp, XFS_DATA_FORK);
346 121397799 : if (error)
347 : return error;
348 :
349 121405342 : error = xfs_dir2_isblock(&args, &isblock);
350 121569213 : if (error)
351 : return error;
352 :
353 121569213 : if (isblock) {
354 4979002 : error = xfs_dir2_block_lookup(&args);
355 4981202 : goto out_check_rval;
356 : }
357 :
358 116590211 : error = xfs_dir2_isleaf(&args, &isleaf);
359 117349376 : if (error)
360 : return error;
361 :
362 117349376 : if (isleaf) {
363 6660475 : error = xfs_dir2_leaf_lookup(&args);
364 6660405 : goto out_check_rval;
365 : }
366 :
367 110688901 : error = xfs_dir2_node_lookup(&args);
368 :
369 778377467 : out_check_rval:
370 778377467 : if (error == -EEXIST)
371 : error = 0;
372 0 : if (!error)
373 778377467 : *ino = args.inumber;
374 : return error;
375 : }
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