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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5c4d97d0 DC |
2 | /* |
3 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. | |
4 | * All Rights Reserved. | |
5c4d97d0 | 5 | */ |
5c4d97d0 DC |
6 | |
7 | #include "xfs.h" | |
8 | #include "xfs_fs.h" | |
5467b34b | 9 | #include "xfs_shared.h" |
5c4d97d0 | 10 | #include "xfs_format.h" |
239880ef DC |
11 | #include "xfs_log_format.h" |
12 | #include "xfs_trans_resv.h" | |
5c4d97d0 | 13 | #include "xfs_mount.h" |
5c4d97d0 | 14 | #include "xfs_inode.h" |
239880ef | 15 | #include "xfs_trans.h" |
5c4d97d0 | 16 | #include "xfs_inode_item.h" |
b3bf607d | 17 | #include "xfs_btree.h" |
a4fbe6ab | 18 | #include "xfs_bmap_btree.h" |
5c4d97d0 DC |
19 | #include "xfs_bmap.h" |
20 | #include "xfs_error.h" | |
5c4d97d0 | 21 | #include "xfs_trace.h" |
244efeaf | 22 | #include "xfs_da_format.h" |
630a04e7 DW |
23 | #include "xfs_da_btree.h" |
24 | #include "xfs_dir2_priv.h" | |
9cfb9b47 | 25 | #include "xfs_attr_leaf.h" |
b9b7e1dc | 26 | #include "xfs_types.h" |
f9fa8716 | 27 | #include "xfs_errortag.h" |
5c4d97d0 | 28 | |
182696fb | 29 | struct kmem_cache *xfs_ifork_cache; |
5c4d97d0 | 30 | |
143f4aed CH |
31 | void |
32 | xfs_init_local_fork( | |
33 | struct xfs_inode *ip, | |
34 | int whichfork, | |
35 | const void *data, | |
3f8a4f1d | 36 | int64_t size) |
143f4aed | 37 | { |
732436ef | 38 | struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); |
b2c28035 | 39 | int mem_size = size; |
30ee052e CH |
40 | bool zero_terminate; |
41 | ||
42 | /* | |
43 | * If we are using the local fork to store a symlink body we need to | |
44 | * zero-terminate it so that we can pass it back to the VFS directly. | |
45 | * Overallocate the in-memory fork by one for that and add a zero | |
46 | * to terminate it below. | |
47 | */ | |
48 | zero_terminate = S_ISLNK(VFS_I(ip)->i_mode); | |
49 | if (zero_terminate) | |
50 | mem_size++; | |
143f4aed | 51 | |
43518812 | 52 | if (size) { |
b2c28035 | 53 | ifp->if_u1.if_data = kmem_alloc(mem_size, KM_NOFS); |
143f4aed | 54 | memcpy(ifp->if_u1.if_data, data, size); |
30ee052e CH |
55 | if (zero_terminate) |
56 | ifp->if_u1.if_data[size] = '\0'; | |
43518812 CH |
57 | } else { |
58 | ifp->if_u1.if_data = NULL; | |
30ee052e | 59 | } |
143f4aed CH |
60 | |
61 | ifp->if_bytes = size; | |
143f4aed CH |
62 | } |
63 | ||
5c4d97d0 DC |
64 | /* |
65 | * The file is in-lined in the on-disk inode. | |
5c4d97d0 DC |
66 | */ |
67 | STATIC int | |
68 | xfs_iformat_local( | |
de38db72 CH |
69 | struct xfs_inode *ip, |
70 | struct xfs_dinode *dip, | |
71 | int whichfork, | |
72 | int size) | |
5c4d97d0 | 73 | { |
5c4d97d0 DC |
74 | /* |
75 | * If the size is unreasonable, then something | |
76 | * is wrong and we just bail out rather than crash in | |
77 | * kmem_alloc() or memcpy() below. | |
78 | */ | |
79 | if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { | |
80 | xfs_warn(ip->i_mount, | |
e9e2eae8 | 81 | "corrupt inode %Lu (bad size %d for local fork, size = %zd).", |
5c4d97d0 DC |
82 | (unsigned long long) ip->i_ino, size, |
83 | XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)); | |
90a58f95 DW |
84 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, |
85 | "xfs_iformat_local", dip, sizeof(*dip), | |
86 | __this_address); | |
2451337d | 87 | return -EFSCORRUPTED; |
5c4d97d0 | 88 | } |
143f4aed CH |
89 | |
90 | xfs_init_local_fork(ip, whichfork, XFS_DFORK_PTR(dip, whichfork), size); | |
5c4d97d0 DC |
91 | return 0; |
92 | } | |
93 | ||
94 | /* | |
0c1d9e4a | 95 | * The file consists of a set of extents all of which fit into the on-disk |
43518812 | 96 | * inode. |
5c4d97d0 DC |
97 | */ |
98 | STATIC int | |
99 | xfs_iformat_extents( | |
0c1d9e4a CH |
100 | struct xfs_inode *ip, |
101 | struct xfs_dinode *dip, | |
102 | int whichfork) | |
5c4d97d0 | 103 | { |
0c1d9e4a | 104 | struct xfs_mount *mp = ip->i_mount; |
732436ef | 105 | struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); |
e8e0e170 | 106 | int state = xfs_bmap_fork_to_state(whichfork); |
dd95a6ce | 107 | xfs_extnum_t nex = xfs_dfork_nextents(dip, whichfork); |
0c1d9e4a | 108 | int size = nex * sizeof(xfs_bmbt_rec_t); |
b2b1712a | 109 | struct xfs_iext_cursor icur; |
0c1d9e4a | 110 | struct xfs_bmbt_rec *dp; |
6bdcf26a | 111 | struct xfs_bmbt_irec new; |
0c1d9e4a | 112 | int i; |
5c4d97d0 DC |
113 | |
114 | /* | |
0c1d9e4a CH |
115 | * If the number of extents is unreasonable, then something is wrong and |
116 | * we just bail out rather than crash in kmem_alloc() or memcpy() below. | |
5c4d97d0 | 117 | */ |
0c1d9e4a | 118 | if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) { |
755c38ff CB |
119 | xfs_warn(ip->i_mount, "corrupt inode %llu ((a)extents = %llu).", |
120 | ip->i_ino, nex); | |
90a58f95 DW |
121 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, |
122 | "xfs_iformat_extents(1)", dip, sizeof(*dip), | |
123 | __this_address); | |
2451337d | 124 | return -EFSCORRUPTED; |
5c4d97d0 DC |
125 | } |
126 | ||
6bdcf26a CH |
127 | ifp->if_bytes = 0; |
128 | ifp->if_u1.if_root = NULL; | |
129 | ifp->if_height = 0; | |
5c4d97d0 DC |
130 | if (size) { |
131 | dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); | |
b2b1712a CH |
132 | |
133 | xfs_iext_first(ifp, &icur); | |
5c4d97d0 | 134 | for (i = 0; i < nex; i++, dp++) { |
30b0984d DW |
135 | xfs_failaddr_t fa; |
136 | ||
dac9c9b1 | 137 | xfs_bmbt_disk_get_all(dp, &new); |
30b0984d DW |
138 | fa = xfs_bmap_validate_extent(ip, whichfork, &new); |
139 | if (fa) { | |
140 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, | |
141 | "xfs_iformat_extents(2)", | |
142 | dp, sizeof(*dp), fa); | |
0c1d9e4a CH |
143 | return -EFSCORRUPTED; |
144 | } | |
b2b1712a | 145 | |
0254c2f2 | 146 | xfs_iext_insert(ip, &icur, &new, state); |
b2b1712a CH |
147 | trace_xfs_read_extent(ip, &icur, state, _THIS_IP_); |
148 | xfs_iext_next(ifp, &icur); | |
5c4d97d0 | 149 | } |
5c4d97d0 | 150 | } |
5c4d97d0 DC |
151 | return 0; |
152 | } | |
153 | ||
154 | /* | |
155 | * The file has too many extents to fit into | |
156 | * the inode, so they are in B-tree format. | |
157 | * Allocate a buffer for the root of the B-tree | |
158 | * and copy the root into it. The i_extents | |
159 | * field will remain NULL until all of the | |
160 | * extents are read in (when they are needed). | |
161 | */ | |
162 | STATIC int | |
163 | xfs_iformat_btree( | |
de38db72 CH |
164 | struct xfs_inode *ip, |
165 | struct xfs_dinode *dip, | |
5c4d97d0 DC |
166 | int whichfork) |
167 | { | |
168 | struct xfs_mount *mp = ip->i_mount; | |
169 | xfs_bmdr_block_t *dfp; | |
3ba738df | 170 | struct xfs_ifork *ifp; |
5c4d97d0 DC |
171 | /* REFERENCED */ |
172 | int nrecs; | |
173 | int size; | |
b3bf607d | 174 | int level; |
5c4d97d0 | 175 | |
732436ef | 176 | ifp = xfs_ifork_ptr(ip, whichfork); |
5c4d97d0 DC |
177 | dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork); |
178 | size = XFS_BMAP_BROOT_SPACE(mp, dfp); | |
179 | nrecs = be16_to_cpu(dfp->bb_numrecs); | |
b3bf607d | 180 | level = be16_to_cpu(dfp->bb_level); |
5c4d97d0 DC |
181 | |
182 | /* | |
183 | * blow out if -- fork has less extents than can fit in | |
184 | * fork (fork shouldn't be a btree format), root btree | |
185 | * block has more records than can fit into the fork, | |
186 | * or the number of extents is greater than the number of | |
187 | * blocks. | |
188 | */ | |
daf83964 | 189 | if (unlikely(ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork) || |
55e45429 | 190 | nrecs == 0 || |
5c4d97d0 DC |
191 | XFS_BMDR_SPACE_CALC(nrecs) > |
192 | XFS_DFORK_SIZE(dip, mp, whichfork) || | |
6e73a545 | 193 | ifp->if_nextents > ip->i_nblocks) || |
973975b7 | 194 | level == 0 || level > XFS_BM_MAXLEVELS(mp, whichfork)) { |
5c4d97d0 DC |
195 | xfs_warn(mp, "corrupt inode %Lu (btree).", |
196 | (unsigned long long) ip->i_ino); | |
90a58f95 DW |
197 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, |
198 | "xfs_iformat_btree", dfp, size, | |
199 | __this_address); | |
2451337d | 200 | return -EFSCORRUPTED; |
5c4d97d0 DC |
201 | } |
202 | ||
203 | ifp->if_broot_bytes = size; | |
707e0dda | 204 | ifp->if_broot = kmem_alloc(size, KM_NOFS); |
5c4d97d0 DC |
205 | ASSERT(ifp->if_broot != NULL); |
206 | /* | |
207 | * Copy and convert from the on-disk structure | |
208 | * to the in-memory structure. | |
209 | */ | |
210 | xfs_bmdr_to_bmbt(ip, dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork), | |
211 | ifp->if_broot, size); | |
5c4d97d0 | 212 | |
6bdcf26a CH |
213 | ifp->if_bytes = 0; |
214 | ifp->if_u1.if_root = NULL; | |
215 | ifp->if_height = 0; | |
5c4d97d0 DC |
216 | return 0; |
217 | } | |
218 | ||
9229d18e CH |
219 | int |
220 | xfs_iformat_data_fork( | |
221 | struct xfs_inode *ip, | |
222 | struct xfs_dinode *dip) | |
223 | { | |
224 | struct inode *inode = VFS_I(ip); | |
0f45a1b2 | 225 | int error; |
9229d18e | 226 | |
daf83964 CH |
227 | /* |
228 | * Initialize the extent count early, as the per-format routines may | |
229 | * depend on it. | |
230 | */ | |
f7e67b20 | 231 | ip->i_df.if_format = dip->di_format; |
dd95a6ce | 232 | ip->i_df.if_nextents = xfs_dfork_data_extents(dip); |
daf83964 | 233 | |
9229d18e CH |
234 | switch (inode->i_mode & S_IFMT) { |
235 | case S_IFIFO: | |
236 | case S_IFCHR: | |
237 | case S_IFBLK: | |
238 | case S_IFSOCK: | |
13d2c10b | 239 | ip->i_disk_size = 0; |
9229d18e CH |
240 | inode->i_rdev = xfs_to_linux_dev_t(xfs_dinode_get_rdev(dip)); |
241 | return 0; | |
242 | case S_IFREG: | |
243 | case S_IFLNK: | |
244 | case S_IFDIR: | |
f7e67b20 | 245 | switch (ip->i_df.if_format) { |
9229d18e | 246 | case XFS_DINODE_FMT_LOCAL: |
0f45a1b2 | 247 | error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, |
9229d18e | 248 | be64_to_cpu(dip->di_size)); |
0f45a1b2 CH |
249 | if (!error) |
250 | error = xfs_ifork_verify_local_data(ip); | |
251 | return error; | |
9229d18e CH |
252 | case XFS_DINODE_FMT_EXTENTS: |
253 | return xfs_iformat_extents(ip, dip, XFS_DATA_FORK); | |
254 | case XFS_DINODE_FMT_BTREE: | |
255 | return xfs_iformat_btree(ip, dip, XFS_DATA_FORK); | |
256 | default: | |
257 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, | |
258 | dip, sizeof(*dip), __this_address); | |
259 | return -EFSCORRUPTED; | |
260 | } | |
261 | break; | |
262 | default: | |
263 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip, | |
264 | sizeof(*dip), __this_address); | |
265 | return -EFSCORRUPTED; | |
266 | } | |
267 | } | |
268 | ||
269 | static uint16_t | |
270 | xfs_dfork_attr_shortform_size( | |
271 | struct xfs_dinode *dip) | |
272 | { | |
273 | struct xfs_attr_shortform *atp = | |
274 | (struct xfs_attr_shortform *)XFS_DFORK_APTR(dip); | |
275 | ||
276 | return be16_to_cpu(atp->hdr.totsize); | |
277 | } | |
278 | ||
e6a688c3 DC |
279 | struct xfs_ifork * |
280 | xfs_ifork_alloc( | |
281 | enum xfs_dinode_fmt format, | |
282 | xfs_extnum_t nextents) | |
283 | { | |
284 | struct xfs_ifork *ifp; | |
285 | ||
182696fb | 286 | ifp = kmem_cache_zalloc(xfs_ifork_cache, GFP_NOFS | __GFP_NOFAIL); |
e6a688c3 DC |
287 | ifp->if_format = format; |
288 | ifp->if_nextents = nextents; | |
289 | return ifp; | |
290 | } | |
291 | ||
9229d18e CH |
292 | int |
293 | xfs_iformat_attr_fork( | |
294 | struct xfs_inode *ip, | |
295 | struct xfs_dinode *dip) | |
296 | { | |
dd95a6ce | 297 | xfs_extnum_t naextents = xfs_dfork_attr_extents(dip); |
9229d18e CH |
298 | int error = 0; |
299 | ||
daf83964 CH |
300 | /* |
301 | * Initialize the extent count early, as the per-format routines may | |
302 | * depend on it. | |
303 | */ | |
dd95a6ce | 304 | ip->i_afp = xfs_ifork_alloc(dip->di_aformat, naextents); |
daf83964 | 305 | |
f7e67b20 | 306 | switch (ip->i_afp->if_format) { |
9229d18e CH |
307 | case XFS_DINODE_FMT_LOCAL: |
308 | error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, | |
309 | xfs_dfork_attr_shortform_size(dip)); | |
0f45a1b2 CH |
310 | if (!error) |
311 | error = xfs_ifork_verify_local_attr(ip); | |
9229d18e CH |
312 | break; |
313 | case XFS_DINODE_FMT_EXTENTS: | |
314 | error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK); | |
315 | break; | |
316 | case XFS_DINODE_FMT_BTREE: | |
317 | error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK); | |
318 | break; | |
319 | default: | |
320 | xfs_inode_verifier_error(ip, error, __func__, dip, | |
321 | sizeof(*dip), __this_address); | |
322 | error = -EFSCORRUPTED; | |
323 | break; | |
324 | } | |
325 | ||
326 | if (error) { | |
182696fb | 327 | kmem_cache_free(xfs_ifork_cache, ip->i_afp); |
9229d18e CH |
328 | ip->i_afp = NULL; |
329 | } | |
330 | return error; | |
331 | } | |
332 | ||
5c4d97d0 DC |
333 | /* |
334 | * Reallocate the space for if_broot based on the number of records | |
335 | * being added or deleted as indicated in rec_diff. Move the records | |
336 | * and pointers in if_broot to fit the new size. When shrinking this | |
337 | * will eliminate holes between the records and pointers created by | |
338 | * the caller. When growing this will create holes to be filled in | |
339 | * by the caller. | |
340 | * | |
341 | * The caller must not request to add more records than would fit in | |
342 | * the on-disk inode root. If the if_broot is currently NULL, then | |
f6c27349 | 343 | * if we are adding records, one will be allocated. The caller must also |
5c4d97d0 DC |
344 | * not request that the number of records go below zero, although |
345 | * it can go to zero. | |
346 | * | |
347 | * ip -- the inode whose if_broot area is changing | |
348 | * ext_diff -- the change in the number of records, positive or negative, | |
349 | * requested for the if_broot array. | |
350 | */ | |
351 | void | |
352 | xfs_iroot_realloc( | |
353 | xfs_inode_t *ip, | |
354 | int rec_diff, | |
355 | int whichfork) | |
356 | { | |
357 | struct xfs_mount *mp = ip->i_mount; | |
358 | int cur_max; | |
3ba738df | 359 | struct xfs_ifork *ifp; |
5c4d97d0 DC |
360 | struct xfs_btree_block *new_broot; |
361 | int new_max; | |
362 | size_t new_size; | |
363 | char *np; | |
364 | char *op; | |
365 | ||
366 | /* | |
367 | * Handle the degenerate case quietly. | |
368 | */ | |
369 | if (rec_diff == 0) { | |
370 | return; | |
371 | } | |
372 | ||
732436ef | 373 | ifp = xfs_ifork_ptr(ip, whichfork); |
5c4d97d0 DC |
374 | if (rec_diff > 0) { |
375 | /* | |
376 | * If there wasn't any memory allocated before, just | |
377 | * allocate it now and get out. | |
378 | */ | |
379 | if (ifp->if_broot_bytes == 0) { | |
380 | new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff); | |
707e0dda | 381 | ifp->if_broot = kmem_alloc(new_size, KM_NOFS); |
5c4d97d0 DC |
382 | ifp->if_broot_bytes = (int)new_size; |
383 | return; | |
384 | } | |
385 | ||
386 | /* | |
387 | * If there is already an existing if_broot, then we need | |
388 | * to realloc() it and shift the pointers to their new | |
389 | * location. The records don't change location because | |
390 | * they are kept butted up against the btree block header. | |
391 | */ | |
392 | cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0); | |
393 | new_max = cur_max + rec_diff; | |
394 | new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max); | |
771915c4 CM |
395 | ifp->if_broot = krealloc(ifp->if_broot, new_size, |
396 | GFP_NOFS | __GFP_NOFAIL); | |
5c4d97d0 DC |
397 | op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, |
398 | ifp->if_broot_bytes); | |
399 | np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, | |
400 | (int)new_size); | |
401 | ifp->if_broot_bytes = (int)new_size; | |
402 | ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <= | |
403 | XFS_IFORK_SIZE(ip, whichfork)); | |
d5cf09ba | 404 | memmove(np, op, cur_max * (uint)sizeof(xfs_fsblock_t)); |
5c4d97d0 DC |
405 | return; |
406 | } | |
407 | ||
408 | /* | |
409 | * rec_diff is less than 0. In this case, we are shrinking the | |
410 | * if_broot buffer. It must already exist. If we go to zero | |
411 | * records, just get rid of the root and clear the status bit. | |
412 | */ | |
413 | ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0)); | |
414 | cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0); | |
415 | new_max = cur_max + rec_diff; | |
416 | ASSERT(new_max >= 0); | |
417 | if (new_max > 0) | |
418 | new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max); | |
419 | else | |
420 | new_size = 0; | |
421 | if (new_size > 0) { | |
707e0dda | 422 | new_broot = kmem_alloc(new_size, KM_NOFS); |
5c4d97d0 DC |
423 | /* |
424 | * First copy over the btree block header. | |
425 | */ | |
426 | memcpy(new_broot, ifp->if_broot, | |
427 | XFS_BMBT_BLOCK_LEN(ip->i_mount)); | |
428 | } else { | |
429 | new_broot = NULL; | |
5c4d97d0 DC |
430 | } |
431 | ||
432 | /* | |
433 | * Only copy the records and pointers if there are any. | |
434 | */ | |
435 | if (new_max > 0) { | |
436 | /* | |
437 | * First copy the records. | |
438 | */ | |
439 | op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1); | |
440 | np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1); | |
441 | memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t)); | |
442 | ||
443 | /* | |
444 | * Then copy the pointers. | |
445 | */ | |
446 | op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, | |
447 | ifp->if_broot_bytes); | |
448 | np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1, | |
449 | (int)new_size); | |
d5cf09ba | 450 | memcpy(np, op, new_max * (uint)sizeof(xfs_fsblock_t)); |
5c4d97d0 DC |
451 | } |
452 | kmem_free(ifp->if_broot); | |
453 | ifp->if_broot = new_broot; | |
454 | ifp->if_broot_bytes = (int)new_size; | |
455 | if (ifp->if_broot) | |
456 | ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <= | |
457 | XFS_IFORK_SIZE(ip, whichfork)); | |
458 | return; | |
459 | } | |
460 | ||
461 | ||
462 | /* | |
463 | * This is called when the amount of space needed for if_data | |
464 | * is increased or decreased. The change in size is indicated by | |
465 | * the number of bytes that need to be added or deleted in the | |
466 | * byte_diff parameter. | |
467 | * | |
468 | * If the amount of space needed has decreased below the size of the | |
469 | * inline buffer, then switch to using the inline buffer. Otherwise, | |
470 | * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer | |
471 | * to what is needed. | |
472 | * | |
473 | * ip -- the inode whose if_data area is changing | |
474 | * byte_diff -- the change in the number of bytes, positive or negative, | |
475 | * requested for the if_data array. | |
476 | */ | |
477 | void | |
478 | xfs_idata_realloc( | |
1216b58b | 479 | struct xfs_inode *ip, |
3f8a4f1d | 480 | int64_t byte_diff, |
1216b58b | 481 | int whichfork) |
5c4d97d0 | 482 | { |
732436ef | 483 | struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); |
3f8a4f1d | 484 | int64_t new_size = ifp->if_bytes + byte_diff; |
5c4d97d0 | 485 | |
5c4d97d0 | 486 | ASSERT(new_size >= 0); |
1216b58b CH |
487 | ASSERT(new_size <= XFS_IFORK_SIZE(ip, whichfork)); |
488 | ||
489 | if (byte_diff == 0) | |
490 | return; | |
5c4d97d0 DC |
491 | |
492 | if (new_size == 0) { | |
43518812 | 493 | kmem_free(ifp->if_u1.if_data); |
5c4d97d0 | 494 | ifp->if_u1.if_data = NULL; |
1216b58b CH |
495 | ifp->if_bytes = 0; |
496 | return; | |
5c4d97d0 | 497 | } |
1216b58b | 498 | |
b2c28035 DC |
499 | ifp->if_u1.if_data = krealloc(ifp->if_u1.if_data, new_size, |
500 | GFP_NOFS | __GFP_NOFAIL); | |
5c4d97d0 | 501 | ifp->if_bytes = new_size; |
5c4d97d0 DC |
502 | } |
503 | ||
504 | void | |
505 | xfs_idestroy_fork( | |
ef838512 | 506 | struct xfs_ifork *ifp) |
5c4d97d0 | 507 | { |
5c4d97d0 DC |
508 | if (ifp->if_broot != NULL) { |
509 | kmem_free(ifp->if_broot); | |
510 | ifp->if_broot = NULL; | |
511 | } | |
512 | ||
0eba048d CH |
513 | switch (ifp->if_format) { |
514 | case XFS_DINODE_FMT_LOCAL: | |
ef838512 CH |
515 | kmem_free(ifp->if_u1.if_data); |
516 | ifp->if_u1.if_data = NULL; | |
0eba048d CH |
517 | break; |
518 | case XFS_DINODE_FMT_EXTENTS: | |
519 | case XFS_DINODE_FMT_BTREE: | |
ef838512 CH |
520 | if (ifp->if_height) |
521 | xfs_iext_destroy(ifp); | |
0eba048d | 522 | break; |
5c4d97d0 DC |
523 | } |
524 | } | |
525 | ||
526 | /* | |
da776503 | 527 | * Convert in-core extents to on-disk form |
5c4d97d0 | 528 | * |
da776503 CH |
529 | * In the case of the data fork, the in-core and on-disk fork sizes can be |
530 | * different due to delayed allocation extents. We only copy on-disk extents | |
531 | * here, so callers must always use the physical fork size to determine the | |
532 | * size of the buffer passed to this routine. We will return the size actually | |
533 | * used. | |
5c4d97d0 DC |
534 | */ |
535 | int | |
536 | xfs_iextents_copy( | |
71565f4b CH |
537 | struct xfs_inode *ip, |
538 | struct xfs_bmbt_rec *dp, | |
5c4d97d0 DC |
539 | int whichfork) |
540 | { | |
e8e0e170 | 541 | int state = xfs_bmap_fork_to_state(whichfork); |
732436ef | 542 | struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); |
b2b1712a | 543 | struct xfs_iext_cursor icur; |
71565f4b | 544 | struct xfs_bmbt_irec rec; |
3f8a4f1d | 545 | int64_t copied = 0; |
5c4d97d0 | 546 | |
71565f4b | 547 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)); |
5c4d97d0 DC |
548 | ASSERT(ifp->if_bytes > 0); |
549 | ||
b2b1712a | 550 | for_each_xfs_iext(ifp, &icur, &rec) { |
71565f4b | 551 | if (isnullstartblock(rec.br_startblock)) |
5c4d97d0 | 552 | continue; |
30b0984d | 553 | ASSERT(xfs_bmap_validate_extent(ip, whichfork, &rec) == NULL); |
71565f4b | 554 | xfs_bmbt_disk_set_all(dp, &rec); |
b2b1712a | 555 | trace_xfs_write_extent(ip, &icur, state, _RET_IP_); |
71565f4b | 556 | copied += sizeof(struct xfs_bmbt_rec); |
5c4d97d0 | 557 | dp++; |
5c4d97d0 | 558 | } |
5c4d97d0 | 559 | |
71565f4b CH |
560 | ASSERT(copied > 0); |
561 | ASSERT(copied <= ifp->if_bytes); | |
562 | return copied; | |
5c4d97d0 DC |
563 | } |
564 | ||
565 | /* | |
566 | * Each of the following cases stores data into the same region | |
567 | * of the on-disk inode, so only one of them can be valid at | |
568 | * any given time. While it is possible to have conflicting formats | |
569 | * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is | |
570 | * in EXTENTS format, this can only happen when the fork has | |
571 | * changed formats after being modified but before being flushed. | |
572 | * In these cases, the format always takes precedence, because the | |
573 | * format indicates the current state of the fork. | |
574 | */ | |
005c5db8 | 575 | void |
5c4d97d0 | 576 | xfs_iflush_fork( |
de38db72 CH |
577 | struct xfs_inode *ip, |
578 | struct xfs_dinode *dip, | |
fd9cbe51 | 579 | struct xfs_inode_log_item *iip, |
fd9fdba6 | 580 | int whichfork) |
5c4d97d0 DC |
581 | { |
582 | char *cp; | |
3ba738df | 583 | struct xfs_ifork *ifp; |
5c4d97d0 DC |
584 | xfs_mount_t *mp; |
585 | static const short brootflag[2] = | |
586 | { XFS_ILOG_DBROOT, XFS_ILOG_ABROOT }; | |
587 | static const short dataflag[2] = | |
588 | { XFS_ILOG_DDATA, XFS_ILOG_ADATA }; | |
589 | static const short extflag[2] = | |
590 | { XFS_ILOG_DEXT, XFS_ILOG_AEXT }; | |
591 | ||
592 | if (!iip) | |
005c5db8 | 593 | return; |
732436ef | 594 | ifp = xfs_ifork_ptr(ip, whichfork); |
5c4d97d0 DC |
595 | /* |
596 | * This can happen if we gave up in iformat in an error path, | |
597 | * for the attribute fork. | |
598 | */ | |
599 | if (!ifp) { | |
600 | ASSERT(whichfork == XFS_ATTR_FORK); | |
005c5db8 | 601 | return; |
5c4d97d0 DC |
602 | } |
603 | cp = XFS_DFORK_PTR(dip, whichfork); | |
604 | mp = ip->i_mount; | |
f7e67b20 | 605 | switch (ifp->if_format) { |
5c4d97d0 DC |
606 | case XFS_DINODE_FMT_LOCAL: |
607 | if ((iip->ili_fields & dataflag[whichfork]) && | |
608 | (ifp->if_bytes > 0)) { | |
609 | ASSERT(ifp->if_u1.if_data != NULL); | |
610 | ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork)); | |
611 | memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes); | |
612 | } | |
613 | break; | |
614 | ||
615 | case XFS_DINODE_FMT_EXTENTS: | |
5c4d97d0 DC |
616 | if ((iip->ili_fields & extflag[whichfork]) && |
617 | (ifp->if_bytes > 0)) { | |
daf83964 | 618 | ASSERT(ifp->if_nextents > 0); |
5c4d97d0 DC |
619 | (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp, |
620 | whichfork); | |
621 | } | |
622 | break; | |
623 | ||
624 | case XFS_DINODE_FMT_BTREE: | |
625 | if ((iip->ili_fields & brootflag[whichfork]) && | |
626 | (ifp->if_broot_bytes > 0)) { | |
627 | ASSERT(ifp->if_broot != NULL); | |
628 | ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <= | |
629 | XFS_IFORK_SIZE(ip, whichfork)); | |
630 | xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes, | |
631 | (xfs_bmdr_block_t *)cp, | |
632 | XFS_DFORK_SIZE(dip, mp, whichfork)); | |
633 | } | |
634 | break; | |
635 | ||
636 | case XFS_DINODE_FMT_DEV: | |
637 | if (iip->ili_fields & XFS_ILOG_DEV) { | |
638 | ASSERT(whichfork == XFS_DATA_FORK); | |
274e0a1f CH |
639 | xfs_dinode_put_rdev(dip, |
640 | linux_to_xfs_dev_t(VFS_I(ip)->i_rdev)); | |
5c4d97d0 DC |
641 | } |
642 | break; | |
643 | ||
5c4d97d0 DC |
644 | default: |
645 | ASSERT(0); | |
646 | break; | |
647 | } | |
648 | } | |
649 | ||
3993baeb DW |
650 | /* Convert bmap state flags to an inode fork. */ |
651 | struct xfs_ifork * | |
652 | xfs_iext_state_to_fork( | |
653 | struct xfs_inode *ip, | |
654 | int state) | |
655 | { | |
656 | if (state & BMAP_COWFORK) | |
657 | return ip->i_cowfp; | |
658 | else if (state & BMAP_ATTRFORK) | |
659 | return ip->i_afp; | |
660 | return &ip->i_df; | |
661 | } | |
662 | ||
3993baeb DW |
663 | /* |
664 | * Initialize an inode's copy-on-write fork. | |
665 | */ | |
666 | void | |
667 | xfs_ifork_init_cow( | |
668 | struct xfs_inode *ip) | |
669 | { | |
670 | if (ip->i_cowfp) | |
671 | return; | |
672 | ||
182696fb | 673 | ip->i_cowfp = kmem_cache_zalloc(xfs_ifork_cache, |
32a2b11f | 674 | GFP_NOFS | __GFP_NOFAIL); |
f7e67b20 | 675 | ip->i_cowfp->if_format = XFS_DINODE_FMT_EXTENTS; |
3993baeb | 676 | } |
9cfb9b47 | 677 | |
9cfb9b47 | 678 | /* Verify the inline contents of the data fork of an inode. */ |
7c7ba218 CH |
679 | int |
680 | xfs_ifork_verify_local_data( | |
1934c8bd | 681 | struct xfs_inode *ip) |
9cfb9b47 | 682 | { |
7c7ba218 | 683 | xfs_failaddr_t fa = NULL; |
9cfb9b47 | 684 | |
9cfb9b47 DW |
685 | switch (VFS_I(ip)->i_mode & S_IFMT) { |
686 | case S_IFDIR: | |
7c7ba218 CH |
687 | fa = xfs_dir2_sf_verify(ip); |
688 | break; | |
9cfb9b47 | 689 | case S_IFLNK: |
7c7ba218 CH |
690 | fa = xfs_symlink_shortform_verify(ip); |
691 | break; | |
9cfb9b47 | 692 | default: |
7c7ba218 | 693 | break; |
9cfb9b47 | 694 | } |
7c7ba218 CH |
695 | |
696 | if (fa) { | |
697 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, "data fork", | |
698 | ip->i_df.if_u1.if_data, ip->i_df.if_bytes, fa); | |
699 | return -EFSCORRUPTED; | |
700 | } | |
701 | ||
702 | return 0; | |
9cfb9b47 DW |
703 | } |
704 | ||
705 | /* Verify the inline contents of the attr fork of an inode. */ | |
7c7ba218 CH |
706 | int |
707 | xfs_ifork_verify_local_attr( | |
1934c8bd | 708 | struct xfs_inode *ip) |
9cfb9b47 | 709 | { |
7c7ba218 CH |
710 | struct xfs_ifork *ifp = ip->i_afp; |
711 | xfs_failaddr_t fa; | |
712 | ||
713 | if (!ifp) | |
714 | fa = __this_address; | |
715 | else | |
716 | fa = xfs_attr_shortform_verify(ip); | |
717 | ||
718 | if (fa) { | |
719 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, "attr fork", | |
720 | ifp ? ifp->if_u1.if_data : NULL, | |
721 | ifp ? ifp->if_bytes : 0, fa); | |
722 | return -EFSCORRUPTED; | |
723 | } | |
724 | ||
725 | return 0; | |
9cfb9b47 | 726 | } |
b9b7e1dc CB |
727 | |
728 | int | |
729 | xfs_iext_count_may_overflow( | |
730 | struct xfs_inode *ip, | |
731 | int whichfork, | |
732 | int nr_to_add) | |
733 | { | |
732436ef | 734 | struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); |
b9b7e1dc CB |
735 | uint64_t max_exts; |
736 | uint64_t nr_exts; | |
737 | ||
738 | if (whichfork == XFS_COW_FORK) | |
739 | return 0; | |
740 | ||
df9ad5cc CB |
741 | max_exts = xfs_iext_max_nextents(xfs_inode_has_large_extent_counts(ip), |
742 | whichfork); | |
b9b7e1dc | 743 | |
f9fa8716 CB |
744 | if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS)) |
745 | max_exts = 10; | |
746 | ||
b9b7e1dc CB |
747 | nr_exts = ifp->if_nextents + nr_to_add; |
748 | if (nr_exts < ifp->if_nextents || nr_exts > max_exts) | |
749 | return -EFBIG; | |
750 | ||
751 | return 0; | |
752 | } | |
4f86bb4b CB |
753 | |
754 | /* | |
755 | * Upgrade this inode's extent counter fields to be able to handle a potential | |
756 | * increase in the extent count by nr_to_add. Normally this is the same | |
757 | * quantity that caused xfs_iext_count_may_overflow() to return -EFBIG. | |
758 | */ | |
759 | int | |
760 | xfs_iext_count_upgrade( | |
761 | struct xfs_trans *tp, | |
762 | struct xfs_inode *ip, | |
763 | uint nr_to_add) | |
764 | { | |
765 | ASSERT(nr_to_add <= XFS_MAX_EXTCNT_UPGRADE_NR); | |
766 | ||
767 | if (!xfs_has_large_extent_counts(ip->i_mount) || | |
768 | xfs_inode_has_large_extent_counts(ip) || | |
769 | XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS)) | |
770 | return -EFBIG; | |
771 | ||
772 | ip->i_diflags2 |= XFS_DIFLAG2_NREXT64; | |
773 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
774 | ||
775 | return 0; | |
776 | } |