Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 : * All Rights Reserved.
5 : */
6 :
7 : #include "xfs.h"
8 : #include "xfs_fs.h"
9 : #include "xfs_shared.h"
10 : #include "xfs_format.h"
11 : #include "xfs_log_format.h"
12 : #include "xfs_trans_resv.h"
13 : #include "xfs_mount.h"
14 : #include "xfs_inode.h"
15 : #include "xfs_trans.h"
16 : #include "xfs_inode_item.h"
17 : #include "xfs_btree.h"
18 : #include "xfs_bmap_btree.h"
19 : #include "xfs_bmap.h"
20 : #include "xfs_error.h"
21 : #include "xfs_trace.h"
22 : #include "xfs_da_format.h"
23 : #include "xfs_da_btree.h"
24 : #include "xfs_dir2_priv.h"
25 : #include "xfs_attr_leaf.h"
26 : #include "xfs_types.h"
27 : #include "xfs_errortag.h"
28 : #include "xfs_health.h"
29 : #include "xfs_symlink_remote.h"
30 :
31 : struct kmem_cache *xfs_ifork_cache;
32 :
33 : void
34 506225183 : xfs_init_local_fork(
35 : struct xfs_inode *ip,
36 : int whichfork,
37 : const void *data,
38 : int64_t size)
39 : {
40 506225183 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
41 506233887 : int mem_size = size;
42 506233887 : bool zero_terminate;
43 :
44 : /*
45 : * If we are using the local fork to store a symlink body we need to
46 : * zero-terminate it so that we can pass it back to the VFS directly.
47 : * Overallocate the in-memory fork by one for that and add a zero
48 : * to terminate it below.
49 : */
50 506233887 : zero_terminate = S_ISLNK(VFS_I(ip)->i_mode);
51 506233887 : if (zero_terminate)
52 38262002 : mem_size++;
53 :
54 506233887 : if (size) {
55 506233887 : ifp->if_u1.if_data = kmem_alloc(mem_size, KM_NOFS);
56 1012483346 : memcpy(ifp->if_u1.if_data, data, size);
57 506241673 : if (zero_terminate)
58 38261995 : ifp->if_u1.if_data[size] = '\0';
59 : } else {
60 0 : ifp->if_u1.if_data = NULL;
61 : }
62 :
63 506241673 : ifp->if_bytes = size;
64 506241673 : }
65 :
66 : /*
67 : * The file is in-lined in the on-disk inode.
68 : */
69 : STATIC int
70 499036415 : xfs_iformat_local(
71 : struct xfs_inode *ip,
72 : struct xfs_dinode *dip,
73 : int whichfork,
74 : int size)
75 : {
76 : /*
77 : * If the size is unreasonable, then something
78 : * is wrong and we just bail out rather than crash in
79 : * kmem_alloc() or memcpy() below.
80 : */
81 499036461 : if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
82 0 : xfs_warn(ip->i_mount,
83 : "corrupt inode %llu (bad size %d for local fork, size = %zd).",
84 : (unsigned long long) ip->i_ino, size,
85 : XFS_DFORK_SIZE(dip, ip->i_mount, whichfork));
86 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED,
87 : "xfs_iformat_local", dip, sizeof(*dip),
88 0 : __this_address);
89 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
90 0 : return -EFSCORRUPTED;
91 : }
92 :
93 998075586 : xfs_init_local_fork(ip, whichfork, XFS_DFORK_PTR(dip, whichfork), size);
94 499036415 : return 0;
95 : }
96 :
97 : /*
98 : * The file consists of a set of extents all of which fit into the on-disk
99 : * inode.
100 : */
101 : STATIC int
102 169596715 : xfs_iformat_extents(
103 : struct xfs_inode *ip,
104 : struct xfs_dinode *dip,
105 : int whichfork)
106 : {
107 169596715 : struct xfs_mount *mp = ip->i_mount;
108 169596715 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
109 169597781 : int state = xfs_bmap_fork_to_state(whichfork);
110 169597781 : xfs_extnum_t nex = xfs_dfork_nextents(dip, whichfork);
111 169598056 : int size = nex * sizeof(xfs_bmbt_rec_t);
112 169598056 : struct xfs_iext_cursor icur;
113 169598056 : struct xfs_bmbt_rec *dp;
114 169598056 : struct xfs_bmbt_irec new;
115 169598056 : int i;
116 :
117 : /*
118 : * If the number of extents is unreasonable, then something is wrong and
119 : * we just bail out rather than crash in kmem_alloc() or memcpy() below.
120 : */
121 169598166 : if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) {
122 0 : xfs_warn(ip->i_mount, "corrupt inode %llu ((a)extents = %llu).",
123 : ip->i_ino, nex);
124 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED,
125 : "xfs_iformat_extents(1)", dip, sizeof(*dip),
126 0 : __this_address);
127 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
128 0 : return -EFSCORRUPTED;
129 : }
130 :
131 169598056 : ifp->if_bytes = 0;
132 169598056 : ifp->if_u1.if_root = NULL;
133 169598056 : ifp->if_height = 0;
134 169598056 : if (size) {
135 235550032 : dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
136 :
137 117775393 : xfs_iext_first(ifp, &icur);
138 630305851 : for (i = 0; i < nex; i++, dp++) {
139 394755232 : xfs_failaddr_t fa;
140 :
141 394755232 : xfs_bmbt_disk_get_all(dp, &new);
142 394751932 : fa = xfs_bmap_validate_extent(ip, whichfork, &new);
143 394749777 : if (fa) {
144 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED,
145 : "xfs_iformat_extents(2)",
146 : dp, sizeof(*dp), fa);
147 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
148 0 : return xfs_bmap_complain_bad_rec(ip, whichfork,
149 : fa, &new);
150 : }
151 :
152 394749777 : xfs_iext_insert(ip, &icur, &new, state);
153 394750351 : trace_xfs_read_extent(ip, &icur, state, _THIS_IP_);
154 394755040 : xfs_iext_next(ifp, &icur);
155 : }
156 : }
157 : return 0;
158 : }
159 :
160 : /*
161 : * The file has too many extents to fit into
162 : * the inode, so they are in B-tree format.
163 : * Allocate a buffer for the root of the B-tree
164 : * and copy the root into it. The i_extents
165 : * field will remain NULL until all of the
166 : * extents are read in (when they are needed).
167 : */
168 : STATIC int
169 11005985 : xfs_iformat_btree(
170 : struct xfs_inode *ip,
171 : struct xfs_dinode *dip,
172 : int whichfork)
173 : {
174 11005985 : struct xfs_mount *mp = ip->i_mount;
175 11005985 : xfs_bmdr_block_t *dfp;
176 11005985 : struct xfs_ifork *ifp;
177 : /* REFERENCED */
178 11005985 : int nrecs;
179 11005985 : int size;
180 11005985 : int level;
181 :
182 11005985 : ifp = xfs_ifork_ptr(ip, whichfork);
183 22011981 : dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork);
184 11005990 : size = XFS_BMAP_BROOT_SPACE(mp, dfp);
185 11005990 : nrecs = be16_to_cpu(dfp->bb_numrecs);
186 11005990 : level = be16_to_cpu(dfp->bb_level);
187 :
188 : /*
189 : * blow out if -- fork has less extents than can fit in
190 : * fork (fork shouldn't be a btree format), root btree
191 : * block has more records than can fit into the fork,
192 : * or the number of extents is greater than the number of
193 : * blocks.
194 : */
195 11005990 : if (unlikely(ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork) ||
196 : nrecs == 0 ||
197 : XFS_BMDR_SPACE_CALC(nrecs) >
198 : XFS_DFORK_SIZE(dip, mp, whichfork) ||
199 11005990 : ifp->if_nextents > ip->i_nblocks) ||
200 11005990 : level == 0 || level > XFS_BM_MAXLEVELS(mp, whichfork)) {
201 0 : xfs_warn(mp, "corrupt inode %llu (btree).",
202 : (unsigned long long) ip->i_ino);
203 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED,
204 : "xfs_iformat_btree", dfp, size,
205 0 : __this_address);
206 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
207 0 : return -EFSCORRUPTED;
208 : }
209 :
210 11005990 : ifp->if_broot_bytes = size;
211 11005990 : ifp->if_broot = kmem_alloc(size, KM_NOFS);
212 11005993 : ASSERT(ifp->if_broot != NULL);
213 : /*
214 : * Copy and convert from the on-disk structure
215 : * to the in-memory structure.
216 : */
217 11005993 : xfs_bmdr_to_bmbt(ip, dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork),
218 : ifp->if_broot, size);
219 :
220 11005990 : ifp->if_bytes = 0;
221 11005990 : ifp->if_u1.if_root = NULL;
222 11005990 : ifp->if_height = 0;
223 11005990 : return 0;
224 : }
225 :
226 : int
227 430482771 : xfs_iformat_data_fork(
228 : struct xfs_inode *ip,
229 : struct xfs_dinode *dip)
230 : {
231 430482771 : struct inode *inode = VFS_I(ip);
232 430482771 : int error;
233 :
234 : /*
235 : * Initialize the extent count early, as the per-format routines may
236 : * depend on it. Use release semantics to set needextents /after/ we
237 : * set the format. This ensures that we can use acquire semantics on
238 : * needextents in xfs_need_iread_extents() and be guaranteed to see a
239 : * valid format value after that load.
240 : */
241 430482771 : ip->i_df.if_format = dip->di_format;
242 430482771 : ip->i_df.if_nextents = xfs_dfork_data_extents(dip);
243 849959585 : smp_store_release(&ip->i_df.if_needextents,
244 : ip->i_df.if_format == XFS_DINODE_FMT_BTREE ? 1 : 0);
245 :
246 430501531 : switch (inode->i_mode & S_IFMT) {
247 181225588 : case S_IFIFO:
248 : case S_IFCHR:
249 : case S_IFBLK:
250 : case S_IFSOCK:
251 181225588 : ip->i_disk_size = 0;
252 181225588 : inode->i_rdev = xfs_to_linux_dev_t(xfs_dinode_get_rdev(dip));
253 181225588 : return 0;
254 249275943 : case S_IFREG:
255 : case S_IFLNK:
256 : case S_IFDIR:
257 249275943 : switch (ip->i_df.if_format) {
258 70034885 : case XFS_DINODE_FMT_LOCAL:
259 70034885 : error = xfs_iformat_local(ip, dip, XFS_DATA_FORK,
260 70034885 : be64_to_cpu(dip->di_size));
261 70034936 : if (!error)
262 70034984 : error = xfs_ifork_verify_local_data(ip);
263 : return error;
264 168235101 : case XFS_DINODE_FMT_EXTENTS:
265 168235101 : return xfs_iformat_extents(ip, dip, XFS_DATA_FORK);
266 11005957 : case XFS_DINODE_FMT_BTREE:
267 11005957 : return xfs_iformat_btree(ip, dip, XFS_DATA_FORK);
268 : default:
269 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__,
270 0 : dip, sizeof(*dip), __this_address);
271 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
272 0 : return -EFSCORRUPTED;
273 : }
274 0 : break;
275 : default:
276 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
277 0 : sizeof(*dip), __this_address);
278 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
279 0 : return -EFSCORRUPTED;
280 : }
281 : }
282 :
283 : static uint16_t
284 429007195 : xfs_dfork_attr_shortform_size(
285 : struct xfs_dinode *dip)
286 : {
287 858014390 : struct xfs_attr_shortform *atp =
288 429007195 : (struct xfs_attr_shortform *)XFS_DFORK_APTR(dip);
289 :
290 429007195 : return be16_to_cpu(atp->hdr.totsize);
291 : }
292 :
293 : void
294 61497432 : xfs_ifork_init_attr(
295 : struct xfs_inode *ip,
296 : enum xfs_dinode_fmt format,
297 : xfs_extnum_t nextents)
298 : {
299 : /*
300 : * Initialize the extent count early, as the per-format routines may
301 : * depend on it. Use release semantics to set needextents /after/ we
302 : * set the format. This ensures that we can use acquire semantics on
303 : * needextents in xfs_need_iread_extents() and be guaranteed to see a
304 : * valid format value after that load.
305 : */
306 491858618 : ip->i_af.if_format = format;
307 491858618 : ip->i_af.if_nextents = nextents;
308 553356050 : smp_store_release(&ip->i_af.if_needextents,
309 : ip->i_af.if_format == XFS_DINODE_FMT_BTREE ? 1 : 0);
310 61494143 : }
311 :
312 : void
313 495232761 : xfs_ifork_zap_attr(
314 : struct xfs_inode *ip)
315 : {
316 495232761 : xfs_idestroy_fork(&ip->i_af);
317 495724426 : memset(&ip->i_af, 0, sizeof(struct xfs_ifork));
318 495724426 : ip->i_af.if_format = XFS_DINODE_FMT_EXTENTS;
319 495724426 : }
320 :
321 : int
322 430361186 : xfs_iformat_attr_fork(
323 : struct xfs_inode *ip,
324 : struct xfs_dinode *dip)
325 : {
326 430361186 : xfs_extnum_t naextents = xfs_dfork_attr_extents(dip);
327 430361186 : int error = 0;
328 :
329 : /*
330 : * Initialize the extent count early, as the per-format routines may
331 : * depend on it.
332 : */
333 430361186 : xfs_ifork_init_attr(ip, dip->di_aformat, naextents);
334 :
335 430370251 : switch (ip->i_af.if_format) {
336 429007526 : case XFS_DINODE_FMT_LOCAL:
337 429007526 : error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK,
338 429007526 : xfs_dfork_attr_shortform_size(dip));
339 429008213 : if (!error)
340 429010919 : error = xfs_ifork_verify_local_attr(ip);
341 : break;
342 1362684 : case XFS_DINODE_FMT_EXTENTS:
343 1362684 : error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK);
344 1362684 : break;
345 41 : case XFS_DINODE_FMT_BTREE:
346 41 : error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK);
347 41 : break;
348 : default:
349 0 : xfs_inode_verifier_error(ip, error, __func__, dip,
350 0 : sizeof(*dip), __this_address);
351 0 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
352 0 : error = -EFSCORRUPTED;
353 0 : break;
354 : }
355 :
356 430365481 : if (error)
357 0 : xfs_ifork_zap_attr(ip);
358 430365481 : return error;
359 : }
360 :
361 : /*
362 : * Reallocate the space for if_broot based on the number of records
363 : * being added or deleted as indicated in rec_diff. Move the records
364 : * and pointers in if_broot to fit the new size. When shrinking this
365 : * will eliminate holes between the records and pointers created by
366 : * the caller. When growing this will create holes to be filled in
367 : * by the caller.
368 : *
369 : * The caller must not request to add more records than would fit in
370 : * the on-disk inode root. If the if_broot is currently NULL, then
371 : * if we are adding records, one will be allocated. The caller must also
372 : * not request that the number of records go below zero, although
373 : * it can go to zero.
374 : *
375 : * ip -- the inode whose if_broot area is changing
376 : * ext_diff -- the change in the number of records, positive or negative,
377 : * requested for the if_broot array.
378 : */
379 : void
380 1362693 : xfs_iroot_realloc(
381 : xfs_inode_t *ip,
382 : int rec_diff,
383 : int whichfork)
384 : {
385 1362693 : struct xfs_mount *mp = ip->i_mount;
386 1362693 : int cur_max;
387 1362693 : struct xfs_ifork *ifp;
388 1362693 : struct xfs_btree_block *new_broot;
389 1362693 : int new_max;
390 1362693 : size_t new_size;
391 1362693 : char *np;
392 1362693 : char *op;
393 :
394 : /*
395 : * Handle the degenerate case quietly.
396 : */
397 1362693 : if (rec_diff == 0) {
398 : return;
399 : }
400 :
401 1362692 : ifp = xfs_ifork_ptr(ip, whichfork);
402 1362694 : if (rec_diff > 0) {
403 : /*
404 : * If there wasn't any memory allocated before, just
405 : * allocate it now and get out.
406 : */
407 889764 : if (ifp->if_broot_bytes == 0) {
408 858298 : new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff);
409 858298 : ifp->if_broot = kmem_alloc(new_size, KM_NOFS);
410 858298 : ifp->if_broot_bytes = (int)new_size;
411 858298 : return;
412 : }
413 :
414 : /*
415 : * If there is already an existing if_broot, then we need
416 : * to realloc() it and shift the pointers to their new
417 : * location. The records don't change location because
418 : * they are kept butted up against the btree block header.
419 : */
420 31466 : cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
421 31466 : new_max = cur_max + rec_diff;
422 31466 : new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
423 31466 : ifp->if_broot = krealloc(ifp->if_broot, new_size,
424 : GFP_NOFS | __GFP_NOFAIL);
425 31466 : op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
426 : ifp->if_broot_bytes);
427 31466 : np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
428 : (int)new_size);
429 31466 : ifp->if_broot_bytes = (int)new_size;
430 31466 : ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
431 : xfs_inode_fork_size(ip, whichfork));
432 62932 : memmove(np, op, cur_max * (uint)sizeof(xfs_fsblock_t));
433 31466 : return;
434 : }
435 :
436 : /*
437 : * rec_diff is less than 0. In this case, we are shrinking the
438 : * if_broot buffer. It must already exist. If we go to zero
439 : * records, just get rid of the root and clear the status bit.
440 : */
441 472930 : ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0));
442 472930 : cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
443 472930 : new_max = cur_max + rec_diff;
444 472930 : ASSERT(new_max >= 0);
445 472930 : if (new_max > 0)
446 26251 : new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
447 : else
448 : new_size = 0;
449 26251 : if (new_size > 0) {
450 26251 : new_broot = kmem_alloc(new_size, KM_NOFS);
451 : /*
452 : * First copy over the btree block header.
453 : */
454 52502 : memcpy(new_broot, ifp->if_broot,
455 : XFS_BMBT_BLOCK_LEN(ip->i_mount));
456 : } else {
457 : new_broot = NULL;
458 : }
459 :
460 : /*
461 : * Only copy the records and pointers if there are any.
462 : */
463 472930 : if (new_max > 0) {
464 : /*
465 : * First copy the records.
466 : */
467 26251 : op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1);
468 26251 : np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1);
469 52502 : memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t));
470 :
471 : /*
472 : * Then copy the pointers.
473 : */
474 26251 : op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
475 : ifp->if_broot_bytes);
476 26251 : np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1,
477 : (int)new_size);
478 52502 : memcpy(np, op, new_max * (uint)sizeof(xfs_fsblock_t));
479 : }
480 472930 : kmem_free(ifp->if_broot);
481 472930 : ifp->if_broot = new_broot;
482 472930 : ifp->if_broot_bytes = (int)new_size;
483 472930 : if (ifp->if_broot)
484 26251 : ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
485 : xfs_inode_fork_size(ip, whichfork));
486 : return;
487 : }
488 :
489 :
490 : /*
491 : * This is called when the amount of space needed for if_data
492 : * is increased or decreased. The change in size is indicated by
493 : * the number of bytes that need to be added or deleted in the
494 : * byte_diff parameter.
495 : *
496 : * If the amount of space needed has decreased below the size of the
497 : * inline buffer, then switch to using the inline buffer. Otherwise,
498 : * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
499 : * to what is needed.
500 : *
501 : * ip -- the inode whose if_data area is changing
502 : * byte_diff -- the change in the number of bytes, positive or negative,
503 : * requested for the if_data array.
504 : */
505 : void
506 372534421 : xfs_idata_realloc(
507 : struct xfs_inode *ip,
508 : int64_t byte_diff,
509 : int whichfork)
510 : {
511 372534421 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
512 372537321 : int64_t new_size = ifp->if_bytes + byte_diff;
513 :
514 372537321 : ASSERT(new_size >= 0);
515 372537321 : ASSERT(new_size <= xfs_inode_fork_size(ip, whichfork));
516 :
517 372537321 : if (byte_diff == 0)
518 : return;
519 :
520 372537321 : if (new_size == 0) {
521 4578107 : kmem_free(ifp->if_u1.if_data);
522 4578110 : ifp->if_u1.if_data = NULL;
523 4578110 : ifp->if_bytes = 0;
524 4578110 : return;
525 : }
526 :
527 367959214 : ifp->if_u1.if_data = krealloc(ifp->if_u1.if_data, new_size,
528 : GFP_NOFS | __GFP_NOFAIL);
529 367963077 : ifp->if_bytes = new_size;
530 : }
531 :
532 : /* Free all memory and reset a fork back to its initial state. */
533 : void
534 855799965 : xfs_idestroy_fork(
535 : struct xfs_ifork *ifp)
536 : {
537 855799965 : if (ifp->if_broot != NULL) {
538 11422145 : kmem_free(ifp->if_broot);
539 11422362 : ifp->if_broot = NULL;
540 : }
541 :
542 855800182 : switch (ifp->if_format) {
543 561397770 : case XFS_DINODE_FMT_LOCAL:
544 561397770 : kmem_free(ifp->if_u1.if_data);
545 562321976 : ifp->if_u1.if_data = NULL;
546 562321976 : break;
547 294402412 : case XFS_DINODE_FMT_EXTENTS:
548 : case XFS_DINODE_FMT_BTREE:
549 294402412 : if (ifp->if_height)
550 124060215 : xfs_iext_destroy(ifp);
551 : break;
552 : }
553 856784762 : }
554 :
555 : /*
556 : * Convert in-core extents to on-disk form
557 : *
558 : * In the case of the data fork, the in-core and on-disk fork sizes can be
559 : * different due to delayed allocation extents. We only copy on-disk extents
560 : * here, so callers must always use the physical fork size to determine the
561 : * size of the buffer passed to this routine. We will return the size actually
562 : * used.
563 : */
564 : int
565 311684282 : xfs_iextents_copy(
566 : struct xfs_inode *ip,
567 : struct xfs_bmbt_rec *dp,
568 : int whichfork)
569 : {
570 311684282 : int state = xfs_bmap_fork_to_state(whichfork);
571 311684282 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
572 311693465 : struct xfs_iext_cursor icur;
573 311693465 : struct xfs_bmbt_irec rec;
574 311693465 : int64_t copied = 0;
575 :
576 311693465 : ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED));
577 311694745 : ASSERT(ifp->if_bytes > 0);
578 :
579 1258867483 : for_each_xfs_iext(ifp, &icur, &rec) {
580 947134637 : if (isnullstartblock(rec.br_startblock))
581 15075519 : continue;
582 932059118 : ASSERT(xfs_bmap_validate_extent(ip, whichfork, &rec) == NULL);
583 932076369 : xfs_bmbt_disk_set_all(dp, &rec);
584 932083072 : trace_xfs_write_extent(ip, &icur, state, _RET_IP_);
585 932097219 : copied += sizeof(struct xfs_bmbt_rec);
586 932097219 : dp++;
587 : }
588 :
589 311693220 : ASSERT(copied > 0);
590 311693220 : ASSERT(copied <= ifp->if_bytes);
591 311693220 : return copied;
592 : }
593 :
594 : /*
595 : * Each of the following cases stores data into the same region
596 : * of the on-disk inode, so only one of them can be valid at
597 : * any given time. While it is possible to have conflicting formats
598 : * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
599 : * in EXTENTS format, this can only happen when the fork has
600 : * changed formats after being modified but before being flushed.
601 : * In these cases, the format always takes precedence, because the
602 : * format indicates the current state of the fork.
603 : */
604 : void
605 368274613 : xfs_iflush_fork(
606 : struct xfs_inode *ip,
607 : struct xfs_dinode *dip,
608 : struct xfs_inode_log_item *iip,
609 : int whichfork)
610 : {
611 368274613 : char *cp;
612 368274613 : struct xfs_ifork *ifp;
613 368274613 : xfs_mount_t *mp;
614 368274613 : static const short brootflag[2] =
615 : { XFS_ILOG_DBROOT, XFS_ILOG_ABROOT };
616 368274613 : static const short dataflag[2] =
617 : { XFS_ILOG_DDATA, XFS_ILOG_ADATA };
618 368274613 : static const short extflag[2] =
619 : { XFS_ILOG_DEXT, XFS_ILOG_AEXT };
620 :
621 368274613 : if (!iip)
622 : return;
623 368274613 : ifp = xfs_ifork_ptr(ip, whichfork);
624 : /*
625 : * This can happen if we gave up in iformat in an error path,
626 : * for the attribute fork.
627 : */
628 368274613 : if (!ifp) {
629 0 : ASSERT(whichfork == XFS_ATTR_FORK);
630 0 : return;
631 : }
632 736548982 : cp = XFS_DFORK_PTR(dip, whichfork);
633 368274613 : mp = ip->i_mount;
634 368274613 : switch (ifp->if_format) {
635 188822211 : case XFS_DINODE_FMT_LOCAL:
636 188822211 : if ((iip->ili_fields & dataflag[whichfork]) &&
637 117626052 : (ifp->if_bytes > 0)) {
638 117626052 : ASSERT(ifp->if_u1.if_data != NULL);
639 117626052 : ASSERT(ifp->if_bytes <= xfs_inode_fork_size(ip, whichfork));
640 235252104 : memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
641 : }
642 : break;
643 :
644 158114709 : case XFS_DINODE_FMT_EXTENTS:
645 158114709 : if ((iip->ili_fields & extflag[whichfork]) &&
646 22920813 : (ifp->if_bytes > 0)) {
647 22920813 : ASSERT(ifp->if_nextents > 0);
648 22920813 : (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
649 : whichfork);
650 : }
651 : break;
652 :
653 5493027 : case XFS_DINODE_FMT_BTREE:
654 5493027 : if ((iip->ili_fields & brootflag[whichfork]) &&
655 678778 : (ifp->if_broot_bytes > 0)) {
656 678778 : ASSERT(ifp->if_broot != NULL);
657 678778 : ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
658 : xfs_inode_fork_size(ip, whichfork));
659 1357556 : xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes,
660 : (xfs_bmdr_block_t *)cp,
661 678778 : XFS_DFORK_SIZE(dip, mp, whichfork));
662 : }
663 : break;
664 :
665 15844666 : case XFS_DINODE_FMT_DEV:
666 15844666 : if (iip->ili_fields & XFS_ILOG_DEV) {
667 7353198 : ASSERT(whichfork == XFS_DATA_FORK);
668 7353198 : xfs_dinode_put_rdev(dip,
669 : linux_to_xfs_dev_t(VFS_I(ip)->i_rdev));
670 : }
671 : break;
672 :
673 0 : default:
674 0 : ASSERT(0);
675 0 : break;
676 : }
677 : }
678 :
679 : /* Convert bmap state flags to an inode fork. */
680 : struct xfs_ifork *
681 1656472357 : xfs_iext_state_to_fork(
682 : struct xfs_inode *ip,
683 : int state)
684 : {
685 1656472357 : if (state & BMAP_COWFORK)
686 5969122 : return ip->i_cowfp;
687 1650503235 : else if (state & BMAP_ATTRFORK)
688 8979720 : return &ip->i_af;
689 1641523515 : return &ip->i_df;
690 : }
691 :
692 : /*
693 : * Initialize an inode's copy-on-write fork.
694 : */
695 : void
696 97643670 : xfs_ifork_init_cow(
697 : struct xfs_inode *ip)
698 : {
699 97643670 : if (ip->i_cowfp)
700 : return;
701 :
702 96881222 : ip->i_cowfp = kmem_cache_zalloc(xfs_ifork_cache,
703 : GFP_NOFS | __GFP_NOFAIL);
704 96881500 : ip->i_cowfp->if_format = XFS_DINODE_FMT_EXTENTS;
705 : }
706 :
707 : /* Verify the inline contents of the data fork of an inode. */
708 : int
709 120107834 : xfs_ifork_verify_local_data(
710 : struct xfs_inode *ip)
711 : {
712 120107834 : xfs_failaddr_t fa = NULL;
713 :
714 120107834 : switch (VFS_I(ip)->i_mode & S_IFMT) {
715 113950151 : case S_IFDIR:
716 113950151 : fa = xfs_dir2_sf_verify(ip);
717 113950151 : break;
718 6157683 : case S_IFLNK:
719 6157683 : fa = xfs_symlink_shortform_verify(ip);
720 6157683 : break;
721 : default:
722 : break;
723 : }
724 :
725 120108597 : if (fa) {
726 4 : xfs_inode_verifier_error(ip, -EFSCORRUPTED, "data fork",
727 4 : ip->i_df.if_u1.if_data, ip->i_df.if_bytes, fa);
728 4 : return -EFSCORRUPTED;
729 : }
730 :
731 : return 0;
732 : }
733 :
734 : /* Verify the inline contents of the attr fork of an inode. */
735 : int
736 567728552 : xfs_ifork_verify_local_attr(
737 : struct xfs_inode *ip)
738 : {
739 567728552 : struct xfs_ifork *ifp = &ip->i_af;
740 567728552 : xfs_failaddr_t fa;
741 :
742 567728552 : if (!xfs_inode_has_attr_fork(ip))
743 0 : fa = __this_address;
744 : else
745 567728552 : fa = xfs_attr_shortform_verify(ip);
746 :
747 567715762 : if (fa) {
748 0 : xfs_inode_verifier_error(ip, -EFSCORRUPTED, "attr fork",
749 0 : ifp->if_u1.if_data, ifp->if_bytes, fa);
750 0 : return -EFSCORRUPTED;
751 : }
752 :
753 : return 0;
754 : }
755 :
756 : int
757 295337638 : xfs_iext_count_may_overflow(
758 : struct xfs_inode *ip,
759 : int whichfork,
760 : int nr_to_add)
761 : {
762 295337638 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
763 295350807 : uint64_t max_exts;
764 295350807 : uint64_t nr_exts;
765 :
766 295350807 : if (whichfork == XFS_COW_FORK)
767 : return 0;
768 :
769 295100298 : max_exts = xfs_iext_max_nextents(xfs_inode_has_large_extent_counts(ip),
770 : whichfork);
771 :
772 295106063 : if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
773 421 : max_exts = 10;
774 :
775 295111546 : nr_exts = ifp->if_nextents + nr_to_add;
776 295111546 : if (nr_exts < ifp->if_nextents || nr_exts > max_exts)
777 56 : return -EFBIG;
778 :
779 : return 0;
780 : }
781 :
782 : /*
783 : * Upgrade this inode's extent counter fields to be able to handle a potential
784 : * increase in the extent count by nr_to_add. Normally this is the same
785 : * quantity that caused xfs_iext_count_may_overflow() to return -EFBIG.
786 : */
787 : int
788 56 : xfs_iext_count_upgrade(
789 : struct xfs_trans *tp,
790 : struct xfs_inode *ip,
791 : uint nr_to_add)
792 : {
793 56 : ASSERT(nr_to_add <= XFS_MAX_EXTCNT_UPGRADE_NR);
794 :
795 56 : if (!xfs_has_large_extent_counts(ip->i_mount) ||
796 0 : xfs_inode_has_large_extent_counts(ip) ||
797 0 : XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
798 56 : return -EFBIG;
799 :
800 0 : ip->i_diflags2 |= XFS_DIFLAG2_NREXT64;
801 0 : xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
802 :
803 0 : return 0;
804 : }
805 :
806 : /* Decide if a file mapping is on the realtime device or not. */
807 : bool
808 562183964 : xfs_ifork_is_realtime(
809 : struct xfs_inode *ip,
810 : int whichfork)
811 : {
812 562183964 : return XFS_IS_REALTIME_INODE(ip) && whichfork != XFS_ATTR_FORK;
813 : }
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