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 3991895283 : 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 3991895283 : struct xfs_name name = {
32 : .name = ".",
33 : .len = 1,
34 : .type = XFS_DIR3_FT_DIR,
35 : };
36 3991895283 : struct xfs_mount *mp = dp->i_mount;
37 3991895283 : struct xfs_da_geometry *geo = mp->m_dir_geo;
38 3991895283 : struct xfs_dir2_sf_entry *sfep;
39 3991895283 : struct xfs_dir2_sf_hdr *sfp;
40 3991895283 : xfs_ino_t ino;
41 3991895283 : xfs_dir2_dataptr_t dapos;
42 3991895283 : unsigned int i;
43 3991895283 : int error;
44 :
45 3991895283 : ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
46 3991895283 : ASSERT(dp->i_df.if_u1.if_data != NULL);
47 :
48 3991895283 : sfp = (struct xfs_dir2_sf_hdr *)dp->i_df.if_u1.if_data;
49 :
50 : /* dot entry */
51 3991895283 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
52 3991895283 : geo->data_entry_offset);
53 :
54 3991920555 : error = dirent_fn(sc, dp, dapos, &name, dp->i_ino, priv);
55 3992391572 : if (error)
56 : return error;
57 :
58 : /* dotdot entry */
59 3993466071 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
60 3993466071 : geo->data_entry_offset +
61 : xfs_dir2_data_entsize(mp, sizeof(".") - 1));
62 3992551931 : ino = xfs_dir2_sf_get_parent_ino(sfp);
63 3989857842 : name.name = "..";
64 3989857842 : name.len = 2;
65 :
66 3989857842 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
67 3991370756 : if (error)
68 : return error;
69 :
70 : /* iterate everything else */
71 3991370756 : sfep = xfs_dir2_sf_firstentry(sfp);
72 20587791235 : for (i = 0; i < sfp->count; i++) {
73 16593857855 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
74 : xfs_dir2_sf_get_offset(sfep));
75 16604430640 : ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
76 16601159067 : name.name = sfep->name;
77 16601159067 : name.len = sfep->namelen;
78 16601159067 : name.type = xfs_dir2_sf_get_ftype(mp, sfep);
79 :
80 16594980796 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
81 16595207529 : if (error)
82 132 : return error;
83 :
84 16595207397 : 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 87459084 : 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 87459084 : struct xfs_mount *mp = dp->i_mount;
99 87459084 : struct xfs_da_geometry *geo = mp->m_dir_geo;
100 87459084 : struct xfs_buf *bp;
101 87459084 : unsigned int off, next_off, end;
102 87459084 : int error;
103 :
104 87459084 : error = xfs_dir3_block_read(sc->tp, dp, dp->i_ino, &bp);
105 87462275 : if (error)
106 : return error;
107 :
108 : /* Walk each directory entry. */
109 87462542 : end = xfs_dir3_data_end_offset(geo, bp->b_addr);
110 2897884546 : for (off = geo->data_entry_offset; off < end; off = next_off) {
111 2810422292 : struct xfs_name name = { };
112 2810422292 : struct xfs_dir2_data_unused *dup = bp->b_addr + off;
113 2810422292 : struct xfs_dir2_data_entry *dep = bp->b_addr + off;
114 2810422292 : xfs_ino_t ino;
115 2810422292 : xfs_dir2_dataptr_t dapos;
116 :
117 : /* Skip an empty entry. */
118 2810422292 : if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
119 224944134 : next_off = off + be16_to_cpu(dup->length);
120 224944134 : continue;
121 : }
122 :
123 : /* Otherwise, find the next entry and report it. */
124 2585478158 : next_off = off + xfs_dir2_data_entsize(mp, dep->namelen);
125 2585478158 : if (next_off > end)
126 : break;
127 :
128 2585478158 : dapos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, off);
129 2585448445 : ino = be64_to_cpu(dep->inumber);
130 2585448445 : name.name = dep->name;
131 2585448445 : name.len = dep->namelen;
132 2585448445 : name.type = xfs_dir2_data_get_ftype(mp, dep);
133 :
134 2585469651 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
135 2585478752 : if (error)
136 : break;
137 : }
138 :
139 87462254 : xfs_trans_brelse(sc->tp, bp);
140 87462254 : return error;
141 : }
142 :
143 : /* Read a leaf-format directory buffer. */
144 : STATIC int
145 112571872 : 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 112571872 : struct xfs_iext_cursor icur;
153 112571872 : struct xfs_bmbt_irec map;
154 112571872 : struct xfs_ifork *ifp = xfs_ifork_ptr(dp, XFS_DATA_FORK);
155 112571872 : xfs_dablk_t last_da;
156 112571872 : xfs_dablk_t map_off;
157 112571872 : xfs_dir2_off_t new_off;
158 :
159 112571872 : *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 112571872 : last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET);
167 112563161 : map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *curoff));
168 :
169 112564871 : if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map))
170 : return 0;
171 112567837 : if (map.br_startoff >= last_da)
172 : return 0;
173 98703849 : xfs_trim_extent(&map, map_off, last_da - map_off);
174 :
175 : /* Read the directory block of that first mapping. */
176 98703424 : new_off = xfs_dir2_da_to_byte(geo, map.br_startoff);
177 98703654 : if (new_off > *curoff)
178 10800 : *curoff = new_off;
179 :
180 98703654 : return xfs_dir3_data_read(tp, dp, dp->i_ino, map.br_startoff, 0, bpp);
181 : }
182 :
183 : /* Call a function for every entry in a leaf directory. */
184 : STATIC int
185 13865722 : 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 13865722 : struct xfs_mount *mp = dp->i_mount;
192 13865722 : struct xfs_da_geometry *geo = mp->m_dir_geo;
193 13865722 : struct xfs_buf *bp = NULL;
194 13865722 : xfs_dir2_off_t curoff = 0;
195 13865722 : unsigned int offset = 0;
196 13865722 : int error;
197 :
198 : /* Iterate every directory offset in this directory. */
199 19253101787 : while (curoff < XFS_DIR2_LEAF_OFFSET) {
200 19253101787 : struct xfs_name name = { };
201 19253101787 : struct xfs_dir2_data_unused *dup;
202 19253101787 : struct xfs_dir2_data_entry *dep;
203 19253101787 : xfs_ino_t ino;
204 19253101787 : unsigned int length;
205 19253101787 : 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 19253101787 : if (!bp || offset >= geo->blksize) {
212 112572067 : if (bp) {
213 98706419 : xfs_trans_brelse(sc->tp, bp);
214 98706607 : bp = NULL;
215 : }
216 :
217 112572255 : error = xchk_read_leaf_dir_buf(sc->tp, dp, geo, &curoff,
218 : &bp);
219 112561591 : if (error || !bp)
220 : break;
221 :
222 : /*
223 : * Find our position in the block.
224 : */
225 98695776 : offset = geo->data_entry_offset;
226 98695776 : curoff += geo->data_entry_offset;
227 : }
228 :
229 : /* Skip an empty entry. */
230 19239225496 : dup = bp->b_addr + offset;
231 19239225496 : if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
232 368861624 : length = be16_to_cpu(dup->length);
233 368861624 : offset += length;
234 368861624 : curoff += length;
235 368861624 : continue;
236 : }
237 :
238 : /* Otherwise, find the next entry and report it. */
239 18870363872 : dep = bp->b_addr + offset;
240 18870363872 : length = xfs_dir2_data_entsize(mp, dep->namelen);
241 :
242 18870363872 : dapos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff;
243 18870363872 : ino = be64_to_cpu(dep->inumber);
244 18870363872 : name.name = dep->name;
245 18870363872 : name.len = dep->namelen;
246 18870363872 : name.type = xfs_dir2_data_get_ftype(mp, dep);
247 :
248 18876327867 : error = dirent_fn(sc, dp, dapos, &name, ino, priv);
249 18870374444 : if (error)
250 : break;
251 :
252 : /* Advance to the next entry. */
253 18870374441 : offset += length;
254 18870374441 : curoff += length;
255 : }
256 :
257 13865818 : if (bp)
258 3 : xfs_trans_brelse(sc->tp, bp);
259 13865818 : 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 4092891755 : xchk_dir_walk(
269 : struct xfs_scrub *sc,
270 : struct xfs_inode *dp,
271 : xchk_dirent_fn dirent_fn,
272 : void *priv)
273 : {
274 4092891755 : struct xfs_da_args args = {
275 : .dp = dp,
276 4092891755 : .geo = dp->i_mount->m_dir_geo,
277 4092891755 : .trans = sc->tp,
278 4092891755 : .owner = dp->i_ino,
279 : };
280 4092891755 : bool isblock;
281 4092891755 : int error;
282 :
283 8185783510 : if (xfs_is_shutdown(dp->i_mount))
284 : return -EIO;
285 :
286 4092891755 : ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
287 4092891755 : ASSERT(xfs_isilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
288 :
289 4094311469 : if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
290 3992985002 : return xchk_dir_walk_sf(sc, dp, dirent_fn, priv);
291 :
292 : /* dir2 functions require that the data fork is loaded */
293 101326467 : error = xfs_iread_extents(sc->tp, dp, XFS_DATA_FORK);
294 101325524 : if (error)
295 : return error;
296 :
297 101325738 : error = xfs_dir2_isblock(&args, &isblock);
298 101330189 : if (error)
299 : return error;
300 :
301 101330189 : if (isblock)
302 87464430 : return xchk_dir_walk_block(sc, dp, dirent_fn, priv);
303 :
304 13865759 : return xchk_dir_walk_leaf(sc, dp, dirent_fn, priv);
305 : }
306 :
307 : /*
308 : * Look up the inode number for an exact name in a directory.
309 : *
310 : * Callers must hold the ILOCK. File types are XFS_DIR3_FT_*. Names are not
311 : * checked for correctness.
312 : */
313 : int
314 383755769 : xchk_dir_lookup(
315 : struct xfs_scrub *sc,
316 : struct xfs_inode *dp,
317 : const struct xfs_name *name,
318 : xfs_ino_t *ino)
319 : {
320 767498757 : struct xfs_da_args args = {
321 : .dp = dp,
322 383755769 : .geo = dp->i_mount->m_dir_geo,
323 383742988 : .trans = sc->tp,
324 383755769 : .name = name->name,
325 383755769 : .namelen = name->len,
326 383755769 : .filetype = name->type,
327 383755769 : .hashval = xfs_dir2_hashname(dp->i_mount, name),
328 : .whichfork = XFS_DATA_FORK,
329 : .op_flags = XFS_DA_OP_OKNOENT,
330 383742988 : .owner = dp->i_ino,
331 : };
332 383742988 : bool isblock, isleaf;
333 383742988 : int error;
334 :
335 767485976 : if (xfs_is_shutdown(dp->i_mount))
336 : return -EIO;
337 :
338 : /*
339 : * A temporary directory's block headers are written with the owner
340 : * set to sc->ip, so we must switch the owner here for the lookup.
341 : */
342 383742988 : if (dp == sc->tempip)
343 2251732 : args.owner = sc->ip->i_ino;
344 :
345 383742988 : ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
346 383742988 : ASSERT(xfs_isilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
347 :
348 383404597 : if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
349 249325282 : error = xfs_dir2_sf_lookup(&args);
350 249601082 : goto out_check_rval;
351 : }
352 :
353 : /* dir2 functions require that the data fork is loaded */
354 134079315 : error = xfs_iread_extents(sc->tp, dp, XFS_DATA_FORK);
355 134151543 : if (error)
356 : return error;
357 :
358 134158658 : error = xfs_dir2_isblock(&args, &isblock);
359 134343577 : if (error)
360 : return error;
361 :
362 134343577 : if (isblock) {
363 14959350 : error = xfs_dir2_block_lookup(&args);
364 14966085 : goto out_check_rval;
365 : }
366 :
367 119384227 : error = xfs_dir2_isleaf(&args, &isleaf);
368 119590979 : if (error)
369 : return error;
370 :
371 119590979 : if (isleaf) {
372 7041472 : error = xfs_dir2_leaf_lookup(&args);
373 7043405 : goto out_check_rval;
374 : }
375 :
376 112549507 : error = xfs_dir2_node_lookup(&args);
377 :
378 384152057 : out_check_rval:
379 384152057 : if (error == -EEXIST)
380 : error = 0;
381 2251721 : if (!error)
382 381900336 : *ino = args.inumber;
383 : return error;
384 : }
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