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37b3b4d6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5d90ab5a DC |
2 | /* |
3 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. | |
4 | * All Rights Reserved. | |
5d90ab5a | 5 | */ |
9c799827 | 6 | #include "libxfs_priv.h" |
b626fb59 DC |
7 | #include "xfs_fs.h" |
8 | #include "xfs_format.h" | |
9 | #include "xfs_log_format.h" | |
10 | #include "xfs_trans_resv.h" | |
11 | #include "xfs_mount.h" | |
12 | #include "xfs_inode.h" | |
13 | #include "xfs_trans.h" | |
81bf5e85 | 14 | #include "xfs_btree.h" |
b626fb59 DC |
15 | #include "xfs_bmap_btree.h" |
16 | #include "xfs_bmap.h" | |
17 | #include "xfs_trace.h" | |
18 | #include "xfs_attr_sf.h" | |
9a5fc886 | 19 | #include "xfs_da_format.h" |
fc1d6454 DW |
20 | #include "xfs_da_btree.h" |
21 | #include "xfs_dir2_priv.h" | |
20e882d4 DW |
22 | #include "xfs_attr_leaf.h" |
23 | #include "xfs_shared.h" | |
5d90ab5a | 24 | |
eae096c5 | 25 | |
5d90ab5a DC |
26 | kmem_zone_t *xfs_ifork_zone; |
27 | ||
28 | STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int); | |
29 | STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int); | |
30 | STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int); | |
31 | ||
5d90ab5a | 32 | /* |
551174eb CH |
33 | * Copy inode type and data and attr format specific information from the |
34 | * on-disk inode to the in-core inode and fork structures. For fifos, devices, | |
35 | * and sockets this means set i_rdev to the proper value. For files, | |
36 | * directories, and symlinks this means to bring in the in-line data or extent | |
37 | * pointers as well as the attribute fork. For a fork in B-tree format, only | |
38 | * the root is immediately brought in-core. The rest will be read in later when | |
39 | * first referenced (see xfs_iread_extents()). | |
5d90ab5a DC |
40 | */ |
41 | int | |
42 | xfs_iformat_fork( | |
551174eb CH |
43 | struct xfs_inode *ip, |
44 | struct xfs_dinode *dip) | |
5d90ab5a | 45 | { |
551174eb CH |
46 | struct inode *inode = VFS_I(ip); |
47 | struct xfs_attr_shortform *atp; | |
5d90ab5a DC |
48 | int size; |
49 | int error = 0; | |
50 | xfs_fsize_t di_size; | |
51 | ||
551174eb | 52 | switch (inode->i_mode & S_IFMT) { |
5d90ab5a DC |
53 | case S_IFIFO: |
54 | case S_IFCHR: | |
55 | case S_IFBLK: | |
56 | case S_IFSOCK: | |
5d90ab5a | 57 | ip->i_d.di_size = 0; |
551174eb | 58 | inode->i_rdev = xfs_to_linux_dev_t(xfs_dinode_get_rdev(dip)); |
5d90ab5a DC |
59 | break; |
60 | ||
61 | case S_IFREG: | |
62 | case S_IFLNK: | |
63 | case S_IFDIR: | |
64 | switch (dip->di_format) { | |
65 | case XFS_DINODE_FMT_LOCAL: | |
5d90ab5a | 66 | di_size = be64_to_cpu(dip->di_size); |
5d90ab5a DC |
67 | size = (int)di_size; |
68 | error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, size); | |
69 | break; | |
70 | case XFS_DINODE_FMT_EXTENTS: | |
71 | error = xfs_iformat_extents(ip, dip, XFS_DATA_FORK); | |
72 | break; | |
73 | case XFS_DINODE_FMT_BTREE: | |
74 | error = xfs_iformat_btree(ip, dip, XFS_DATA_FORK); | |
75 | break; | |
76 | default: | |
12b53197 | 77 | return -EFSCORRUPTED; |
5d90ab5a DC |
78 | } |
79 | break; | |
80 | ||
81 | default: | |
12b53197 | 82 | return -EFSCORRUPTED; |
5d90ab5a | 83 | } |
cb8a004a | 84 | if (error) |
5d90ab5a | 85 | return error; |
cb8a004a DW |
86 | |
87 | if (xfs_is_reflink_inode(ip)) { | |
88 | ASSERT(ip->i_cowfp == NULL); | |
89 | xfs_ifork_init_cow(ip); | |
5d90ab5a | 90 | } |
cb8a004a | 91 | |
5d90ab5a DC |
92 | if (!XFS_DFORK_Q(dip)) |
93 | return 0; | |
94 | ||
95 | ASSERT(ip->i_afp == NULL); | |
96 | ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP | KM_NOFS); | |
97 | ||
98 | switch (dip->di_aformat) { | |
99 | case XFS_DINODE_FMT_LOCAL: | |
100 | atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip); | |
101 | size = be16_to_cpu(atp->hdr.totsize); | |
102 | ||
5d90ab5a DC |
103 | error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size); |
104 | break; | |
105 | case XFS_DINODE_FMT_EXTENTS: | |
106 | error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK); | |
107 | break; | |
108 | case XFS_DINODE_FMT_BTREE: | |
109 | error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK); | |
110 | break; | |
111 | default: | |
12b53197 | 112 | error = -EFSCORRUPTED; |
5d90ab5a DC |
113 | break; |
114 | } | |
115 | if (error) { | |
116 | kmem_zone_free(xfs_ifork_zone, ip->i_afp); | |
117 | ip->i_afp = NULL; | |
cb8a004a DW |
118 | if (ip->i_cowfp) |
119 | kmem_zone_free(xfs_ifork_zone, ip->i_cowfp); | |
120 | ip->i_cowfp = NULL; | |
5d90ab5a DC |
121 | xfs_idestroy_fork(ip, XFS_DATA_FORK); |
122 | } | |
123 | return error; | |
124 | } | |
125 | ||
219eec76 CH |
126 | void |
127 | xfs_init_local_fork( | |
128 | struct xfs_inode *ip, | |
129 | int whichfork, | |
130 | const void *data, | |
131 | int size) | |
132 | { | |
133 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); | |
4cab415f CH |
134 | int mem_size = size, real_size = 0; |
135 | bool zero_terminate; | |
136 | ||
137 | /* | |
138 | * If we are using the local fork to store a symlink body we need to | |
139 | * zero-terminate it so that we can pass it back to the VFS directly. | |
140 | * Overallocate the in-memory fork by one for that and add a zero | |
141 | * to terminate it below. | |
142 | */ | |
143 | zero_terminate = S_ISLNK(VFS_I(ip)->i_mode); | |
144 | if (zero_terminate) | |
145 | mem_size++; | |
219eec76 | 146 | |
07fe4665 | 147 | if (size) { |
4cab415f | 148 | real_size = roundup(mem_size, 4); |
219eec76 | 149 | ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS); |
219eec76 | 150 | memcpy(ifp->if_u1.if_data, data, size); |
4cab415f CH |
151 | if (zero_terminate) |
152 | ifp->if_u1.if_data[size] = '\0'; | |
07fe4665 CH |
153 | } else { |
154 | ifp->if_u1.if_data = NULL; | |
4cab415f | 155 | } |
219eec76 CH |
156 | |
157 | ifp->if_bytes = size; | |
219eec76 CH |
158 | ifp->if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); |
159 | ifp->if_flags |= XFS_IFINLINE; | |
160 | } | |
161 | ||
5d90ab5a DC |
162 | /* |
163 | * The file is in-lined in the on-disk inode. | |
5d90ab5a DC |
164 | */ |
165 | STATIC int | |
166 | xfs_iformat_local( | |
167 | xfs_inode_t *ip, | |
168 | xfs_dinode_t *dip, | |
169 | int whichfork, | |
170 | int size) | |
171 | { | |
5d90ab5a DC |
172 | /* |
173 | * If the size is unreasonable, then something | |
174 | * is wrong and we just bail out rather than crash in | |
175 | * kmem_alloc() or memcpy() below. | |
176 | */ | |
177 | if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { | |
178 | xfs_warn(ip->i_mount, | |
179 | "corrupt inode %Lu (bad size %d for local fork, size = %d).", | |
180 | (unsigned long long) ip->i_ino, size, | |
181 | XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)); | |
b02a2c9e DW |
182 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, |
183 | "xfs_iformat_local", dip, sizeof(*dip), | |
184 | __this_address); | |
12b53197 | 185 | return -EFSCORRUPTED; |
5d90ab5a | 186 | } |
219eec76 CH |
187 | |
188 | xfs_init_local_fork(ip, whichfork, XFS_DFORK_PTR(dip, whichfork), size); | |
5d90ab5a DC |
189 | return 0; |
190 | } | |
191 | ||
192 | /* | |
1f2a4478 | 193 | * The file consists of a set of extents all of which fit into the on-disk |
07fe4665 | 194 | * inode. |
5d90ab5a DC |
195 | */ |
196 | STATIC int | |
197 | xfs_iformat_extents( | |
1f2a4478 CH |
198 | struct xfs_inode *ip, |
199 | struct xfs_dinode *dip, | |
200 | int whichfork) | |
5d90ab5a | 201 | { |
1f2a4478 CH |
202 | struct xfs_mount *mp = ip->i_mount; |
203 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); | |
322fd804 | 204 | int state = xfs_bmap_fork_to_state(whichfork); |
1f2a4478 CH |
205 | int nex = XFS_DFORK_NEXTENTS(dip, whichfork); |
206 | int size = nex * sizeof(xfs_bmbt_rec_t); | |
9788e059 | 207 | struct xfs_iext_cursor icur; |
1f2a4478 | 208 | struct xfs_bmbt_rec *dp; |
b37d753d | 209 | struct xfs_bmbt_irec new; |
1f2a4478 | 210 | int i; |
5d90ab5a DC |
211 | |
212 | /* | |
1f2a4478 CH |
213 | * If the number of extents is unreasonable, then something is wrong and |
214 | * we just bail out rather than crash in kmem_alloc() or memcpy() below. | |
5d90ab5a | 215 | */ |
1f2a4478 | 216 | if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) { |
5d90ab5a DC |
217 | xfs_warn(ip->i_mount, "corrupt inode %Lu ((a)extents = %d).", |
218 | (unsigned long long) ip->i_ino, nex); | |
b02a2c9e DW |
219 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, |
220 | "xfs_iformat_extents(1)", dip, sizeof(*dip), | |
221 | __this_address); | |
12b53197 | 222 | return -EFSCORRUPTED; |
5d90ab5a DC |
223 | } |
224 | ||
b37d753d CH |
225 | ifp->if_bytes = 0; |
226 | ifp->if_u1.if_root = NULL; | |
227 | ifp->if_height = 0; | |
5d90ab5a DC |
228 | if (size) { |
229 | dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); | |
9788e059 CH |
230 | |
231 | xfs_iext_first(ifp, &icur); | |
5d90ab5a | 232 | for (i = 0; i < nex; i++, dp++) { |
0cf6a3a9 DW |
233 | xfs_failaddr_t fa; |
234 | ||
080f0c71 | 235 | xfs_bmbt_disk_get_all(dp, &new); |
0cf6a3a9 DW |
236 | fa = xfs_bmap_validate_extent(ip, whichfork, &new); |
237 | if (fa) { | |
238 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, | |
239 | "xfs_iformat_extents(2)", | |
240 | dp, sizeof(*dp), fa); | |
1f2a4478 CH |
241 | return -EFSCORRUPTED; |
242 | } | |
9788e059 | 243 | |
26a75f67 | 244 | xfs_iext_insert(ip, &icur, &new, state); |
9788e059 CH |
245 | trace_xfs_read_extent(ip, &icur, state, _THIS_IP_); |
246 | xfs_iext_next(ifp, &icur); | |
5d90ab5a | 247 | } |
5d90ab5a DC |
248 | } |
249 | ifp->if_flags |= XFS_IFEXTENTS; | |
250 | return 0; | |
251 | } | |
252 | ||
253 | /* | |
254 | * The file has too many extents to fit into | |
255 | * the inode, so they are in B-tree format. | |
256 | * Allocate a buffer for the root of the B-tree | |
257 | * and copy the root into it. The i_extents | |
258 | * field will remain NULL until all of the | |
259 | * extents are read in (when they are needed). | |
260 | */ | |
261 | STATIC int | |
262 | xfs_iformat_btree( | |
263 | xfs_inode_t *ip, | |
264 | xfs_dinode_t *dip, | |
265 | int whichfork) | |
266 | { | |
267 | struct xfs_mount *mp = ip->i_mount; | |
268 | xfs_bmdr_block_t *dfp; | |
e07055b8 | 269 | struct xfs_ifork *ifp; |
5d90ab5a DC |
270 | /* REFERENCED */ |
271 | int nrecs; | |
272 | int size; | |
81bf5e85 | 273 | int level; |
5d90ab5a DC |
274 | |
275 | ifp = XFS_IFORK_PTR(ip, whichfork); | |
276 | dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork); | |
277 | size = XFS_BMAP_BROOT_SPACE(mp, dfp); | |
278 | nrecs = be16_to_cpu(dfp->bb_numrecs); | |
81bf5e85 | 279 | level = be16_to_cpu(dfp->bb_level); |
5d90ab5a DC |
280 | |
281 | /* | |
282 | * blow out if -- fork has less extents than can fit in | |
283 | * fork (fork shouldn't be a btree format), root btree | |
284 | * block has more records than can fit into the fork, | |
285 | * or the number of extents is greater than the number of | |
286 | * blocks. | |
287 | */ | |
288 | if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= | |
289 | XFS_IFORK_MAXEXT(ip, whichfork) || | |
e4b963e9 | 290 | nrecs == 0 || |
5d90ab5a DC |
291 | XFS_BMDR_SPACE_CALC(nrecs) > |
292 | XFS_DFORK_SIZE(dip, mp, whichfork) || | |
81bf5e85 DW |
293 | XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks) || |
294 | level == 0 || level > XFS_BTREE_MAXLEVELS) { | |
5d90ab5a DC |
295 | xfs_warn(mp, "corrupt inode %Lu (btree).", |
296 | (unsigned long long) ip->i_ino); | |
b02a2c9e DW |
297 | xfs_inode_verifier_error(ip, -EFSCORRUPTED, |
298 | "xfs_iformat_btree", dfp, size, | |
299 | __this_address); | |
12b53197 | 300 | return -EFSCORRUPTED; |
5d90ab5a DC |
301 | } |
302 | ||
303 | ifp->if_broot_bytes = size; | |
304 | ifp->if_broot = kmem_alloc(size, KM_SLEEP | KM_NOFS); | |
305 | ASSERT(ifp->if_broot != NULL); | |
306 | /* | |
307 | * Copy and convert from the on-disk structure | |
308 | * to the in-memory structure. | |
309 | */ | |
310 | xfs_bmdr_to_bmbt(ip, dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork), | |
311 | ifp->if_broot, size); | |
312 | ifp->if_flags &= ~XFS_IFEXTENTS; | |
313 | ifp->if_flags |= XFS_IFBROOT; | |
314 | ||
b37d753d CH |
315 | ifp->if_bytes = 0; |
316 | ifp->if_u1.if_root = NULL; | |
317 | ifp->if_height = 0; | |
5d90ab5a DC |
318 | return 0; |
319 | } | |
320 | ||
5d90ab5a DC |
321 | /* |
322 | * Reallocate the space for if_broot based on the number of records | |
323 | * being added or deleted as indicated in rec_diff. Move the records | |
324 | * and pointers in if_broot to fit the new size. When shrinking this | |
325 | * will eliminate holes between the records and pointers created by | |
326 | * the caller. When growing this will create holes to be filled in | |
327 | * by the caller. | |
328 | * | |
329 | * The caller must not request to add more records than would fit in | |
330 | * the on-disk inode root. If the if_broot is currently NULL, then | |
e6d77a21 | 331 | * if we are adding records, one will be allocated. The caller must also |
5d90ab5a DC |
332 | * not request that the number of records go below zero, although |
333 | * it can go to zero. | |
334 | * | |
335 | * ip -- the inode whose if_broot area is changing | |
336 | * ext_diff -- the change in the number of records, positive or negative, | |
337 | * requested for the if_broot array. | |
338 | */ | |
339 | void | |
340 | xfs_iroot_realloc( | |
341 | xfs_inode_t *ip, | |
342 | int rec_diff, | |
343 | int whichfork) | |
344 | { | |
345 | struct xfs_mount *mp = ip->i_mount; | |
346 | int cur_max; | |
e07055b8 | 347 | struct xfs_ifork *ifp; |
5d90ab5a DC |
348 | struct xfs_btree_block *new_broot; |
349 | int new_max; | |
350 | size_t new_size; | |
351 | char *np; | |
352 | char *op; | |
353 | ||
354 | /* | |
355 | * Handle the degenerate case quietly. | |
356 | */ | |
357 | if (rec_diff == 0) { | |
358 | return; | |
359 | } | |
360 | ||
361 | ifp = XFS_IFORK_PTR(ip, whichfork); | |
362 | if (rec_diff > 0) { | |
363 | /* | |
364 | * If there wasn't any memory allocated before, just | |
365 | * allocate it now and get out. | |
366 | */ | |
367 | if (ifp->if_broot_bytes == 0) { | |
368 | new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff); | |
369 | ifp->if_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS); | |
370 | ifp->if_broot_bytes = (int)new_size; | |
371 | return; | |
372 | } | |
373 | ||
374 | /* | |
375 | * If there is already an existing if_broot, then we need | |
376 | * to realloc() it and shift the pointers to their new | |
377 | * location. The records don't change location because | |
378 | * they are kept butted up against the btree block header. | |
379 | */ | |
380 | cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0); | |
381 | new_max = cur_max + rec_diff; | |
382 | new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max); | |
383 | ifp->if_broot = kmem_realloc(ifp->if_broot, new_size, | |
5d90ab5a DC |
384 | KM_SLEEP | KM_NOFS); |
385 | op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, | |
386 | ifp->if_broot_bytes); | |
387 | np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, | |
388 | (int)new_size); | |
389 | ifp->if_broot_bytes = (int)new_size; | |
390 | ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <= | |
391 | XFS_IFORK_SIZE(ip, whichfork)); | |
5a35bf2c | 392 | memmove(np, op, cur_max * (uint)sizeof(xfs_fsblock_t)); |
5d90ab5a DC |
393 | return; |
394 | } | |
395 | ||
396 | /* | |
397 | * rec_diff is less than 0. In this case, we are shrinking the | |
398 | * if_broot buffer. It must already exist. If we go to zero | |
399 | * records, just get rid of the root and clear the status bit. | |
400 | */ | |
401 | ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0)); | |
402 | cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0); | |
403 | new_max = cur_max + rec_diff; | |
404 | ASSERT(new_max >= 0); | |
405 | if (new_max > 0) | |
406 | new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max); | |
407 | else | |
408 | new_size = 0; | |
409 | if (new_size > 0) { | |
410 | new_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS); | |
411 | /* | |
412 | * First copy over the btree block header. | |
413 | */ | |
414 | memcpy(new_broot, ifp->if_broot, | |
415 | XFS_BMBT_BLOCK_LEN(ip->i_mount)); | |
416 | } else { | |
417 | new_broot = NULL; | |
418 | ifp->if_flags &= ~XFS_IFBROOT; | |
419 | } | |
420 | ||
421 | /* | |
422 | * Only copy the records and pointers if there are any. | |
423 | */ | |
424 | if (new_max > 0) { | |
425 | /* | |
426 | * First copy the records. | |
427 | */ | |
428 | op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1); | |
429 | np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1); | |
430 | memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t)); | |
431 | ||
432 | /* | |
433 | * Then copy the pointers. | |
434 | */ | |
435 | op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, | |
436 | ifp->if_broot_bytes); | |
437 | np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1, | |
438 | (int)new_size); | |
5a35bf2c | 439 | memcpy(np, op, new_max * (uint)sizeof(xfs_fsblock_t)); |
5d90ab5a DC |
440 | } |
441 | kmem_free(ifp->if_broot); | |
442 | ifp->if_broot = new_broot; | |
443 | ifp->if_broot_bytes = (int)new_size; | |
444 | if (ifp->if_broot) | |
445 | ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <= | |
446 | XFS_IFORK_SIZE(ip, whichfork)); | |
447 | return; | |
448 | } | |
449 | ||
450 | ||
451 | /* | |
452 | * This is called when the amount of space needed for if_data | |
453 | * is increased or decreased. The change in size is indicated by | |
454 | * the number of bytes that need to be added or deleted in the | |
455 | * byte_diff parameter. | |
456 | * | |
457 | * If the amount of space needed has decreased below the size of the | |
458 | * inline buffer, then switch to using the inline buffer. Otherwise, | |
459 | * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer | |
460 | * to what is needed. | |
461 | * | |
462 | * ip -- the inode whose if_data area is changing | |
463 | * byte_diff -- the change in the number of bytes, positive or negative, | |
464 | * requested for the if_data array. | |
465 | */ | |
466 | void | |
467 | xfs_idata_realloc( | |
2282d1d1 CH |
468 | struct xfs_inode *ip, |
469 | int byte_diff, | |
470 | int whichfork) | |
5d90ab5a | 471 | { |
2282d1d1 CH |
472 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); |
473 | int new_size = (int)ifp->if_bytes + byte_diff; | |
5d90ab5a | 474 | |
5d90ab5a | 475 | ASSERT(new_size >= 0); |
2282d1d1 CH |
476 | ASSERT(new_size <= XFS_IFORK_SIZE(ip, whichfork)); |
477 | ||
478 | if (byte_diff == 0) | |
479 | return; | |
5d90ab5a DC |
480 | |
481 | if (new_size == 0) { | |
07fe4665 | 482 | kmem_free(ifp->if_u1.if_data); |
5d90ab5a | 483 | ifp->if_u1.if_data = NULL; |
2282d1d1 CH |
484 | ifp->if_bytes = 0; |
485 | return; | |
5d90ab5a | 486 | } |
2282d1d1 CH |
487 | |
488 | /* | |
489 | * For inline data, the underlying buffer must be a multiple of 4 bytes | |
490 | * in size so that it can be logged and stay on word boundaries. | |
491 | * We enforce that here. | |
492 | */ | |
493 | ifp->if_u1.if_data = kmem_realloc(ifp->if_u1.if_data, | |
494 | roundup(new_size, 4), KM_SLEEP | KM_NOFS); | |
5d90ab5a | 495 | ifp->if_bytes = new_size; |
5d90ab5a DC |
496 | } |
497 | ||
498 | void | |
499 | xfs_idestroy_fork( | |
500 | xfs_inode_t *ip, | |
501 | int whichfork) | |
502 | { | |
e07055b8 | 503 | struct xfs_ifork *ifp; |
5d90ab5a DC |
504 | |
505 | ifp = XFS_IFORK_PTR(ip, whichfork); | |
506 | if (ifp->if_broot != NULL) { | |
507 | kmem_free(ifp->if_broot); | |
508 | ifp->if_broot = NULL; | |
509 | } | |
510 | ||
511 | /* | |
512 | * If the format is local, then we can't have an extents | |
513 | * array so just look for an inline data array. If we're | |
514 | * not local then we may or may not have an extents list, | |
515 | * so check and free it up if we do. | |
516 | */ | |
517 | if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) { | |
07fe4665 | 518 | if (ifp->if_u1.if_data != NULL) { |
5d90ab5a DC |
519 | kmem_free(ifp->if_u1.if_data); |
520 | ifp->if_u1.if_data = NULL; | |
5d90ab5a | 521 | } |
b37d753d | 522 | } else if ((ifp->if_flags & XFS_IFEXTENTS) && ifp->if_height) { |
5d90ab5a DC |
523 | xfs_iext_destroy(ifp); |
524 | } | |
b37d753d | 525 | |
5d90ab5a DC |
526 | if (whichfork == XFS_ATTR_FORK) { |
527 | kmem_zone_free(xfs_ifork_zone, ip->i_afp); | |
528 | ip->i_afp = NULL; | |
cb8a004a DW |
529 | } else if (whichfork == XFS_COW_FORK) { |
530 | kmem_zone_free(xfs_ifork_zone, ip->i_cowfp); | |
531 | ip->i_cowfp = NULL; | |
5d90ab5a DC |
532 | } |
533 | } | |
534 | ||
535 | /* | |
ff105f75 | 536 | * Convert in-core extents to on-disk form |
5d90ab5a | 537 | * |
ff105f75 DC |
538 | * In the case of the data fork, the in-core and on-disk fork sizes can be |
539 | * different due to delayed allocation extents. We only copy on-disk extents | |
540 | * here, so callers must always use the physical fork size to determine the | |
541 | * size of the buffer passed to this routine. We will return the size actually | |
542 | * used. | |
5d90ab5a DC |
543 | */ |
544 | int | |
545 | xfs_iextents_copy( | |
f11e7501 CH |
546 | struct xfs_inode *ip, |
547 | struct xfs_bmbt_rec *dp, | |
5d90ab5a DC |
548 | int whichfork) |
549 | { | |
322fd804 | 550 | int state = xfs_bmap_fork_to_state(whichfork); |
f11e7501 | 551 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); |
9788e059 | 552 | struct xfs_iext_cursor icur; |
f11e7501 | 553 | struct xfs_bmbt_irec rec; |
9788e059 | 554 | int copied = 0; |
5d90ab5a | 555 | |
f11e7501 | 556 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)); |
5d90ab5a DC |
557 | ASSERT(ifp->if_bytes > 0); |
558 | ||
9788e059 | 559 | for_each_xfs_iext(ifp, &icur, &rec) { |
f11e7501 | 560 | if (isnullstartblock(rec.br_startblock)) |
5d90ab5a | 561 | continue; |
0cf6a3a9 | 562 | ASSERT(xfs_bmap_validate_extent(ip, whichfork, &rec) == NULL); |
f11e7501 | 563 | xfs_bmbt_disk_set_all(dp, &rec); |
9788e059 | 564 | trace_xfs_write_extent(ip, &icur, state, _RET_IP_); |
f11e7501 | 565 | copied += sizeof(struct xfs_bmbt_rec); |
5d90ab5a | 566 | dp++; |
5d90ab5a | 567 | } |
5d90ab5a | 568 | |
f11e7501 CH |
569 | ASSERT(copied > 0); |
570 | ASSERT(copied <= ifp->if_bytes); | |
571 | return copied; | |
5d90ab5a DC |
572 | } |
573 | ||
574 | /* | |
575 | * Each of the following cases stores data into the same region | |
576 | * of the on-disk inode, so only one of them can be valid at | |
577 | * any given time. While it is possible to have conflicting formats | |
578 | * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is | |
579 | * in EXTENTS format, this can only happen when the fork has | |
580 | * changed formats after being modified but before being flushed. | |
581 | * In these cases, the format always takes precedence, because the | |
582 | * format indicates the current state of the fork. | |
583 | */ | |
d15188a1 | 584 | void |
5d90ab5a DC |
585 | xfs_iflush_fork( |
586 | xfs_inode_t *ip, | |
587 | xfs_dinode_t *dip, | |
588 | xfs_inode_log_item_t *iip, | |
ff105f75 | 589 | int whichfork) |
5d90ab5a DC |
590 | { |
591 | char *cp; | |
e07055b8 | 592 | struct xfs_ifork *ifp; |
5d90ab5a DC |
593 | xfs_mount_t *mp; |
594 | static const short brootflag[2] = | |
595 | { XFS_ILOG_DBROOT, XFS_ILOG_ABROOT }; | |
596 | static const short dataflag[2] = | |
597 | { XFS_ILOG_DDATA, XFS_ILOG_ADATA }; | |
598 | static const short extflag[2] = | |
599 | { XFS_ILOG_DEXT, XFS_ILOG_AEXT }; | |
600 | ||
601 | if (!iip) | |
d15188a1 | 602 | return; |
5d90ab5a DC |
603 | ifp = XFS_IFORK_PTR(ip, whichfork); |
604 | /* | |
605 | * This can happen if we gave up in iformat in an error path, | |
606 | * for the attribute fork. | |
607 | */ | |
608 | if (!ifp) { | |
609 | ASSERT(whichfork == XFS_ATTR_FORK); | |
d15188a1 | 610 | return; |
5d90ab5a DC |
611 | } |
612 | cp = XFS_DFORK_PTR(dip, whichfork); | |
613 | mp = ip->i_mount; | |
614 | switch (XFS_IFORK_FORMAT(ip, whichfork)) { | |
615 | case XFS_DINODE_FMT_LOCAL: | |
616 | if ((iip->ili_fields & dataflag[whichfork]) && | |
617 | (ifp->if_bytes > 0)) { | |
618 | ASSERT(ifp->if_u1.if_data != NULL); | |
619 | ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork)); | |
620 | memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes); | |
621 | } | |
622 | break; | |
623 | ||
624 | case XFS_DINODE_FMT_EXTENTS: | |
625 | ASSERT((ifp->if_flags & XFS_IFEXTENTS) || | |
626 | !(iip->ili_fields & extflag[whichfork])); | |
627 | if ((iip->ili_fields & extflag[whichfork]) && | |
628 | (ifp->if_bytes > 0)) { | |
5d90ab5a DC |
629 | ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0); |
630 | (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp, | |
631 | whichfork); | |
632 | } | |
633 | break; | |
634 | ||
635 | case XFS_DINODE_FMT_BTREE: | |
636 | if ((iip->ili_fields & brootflag[whichfork]) && | |
637 | (ifp->if_broot_bytes > 0)) { | |
638 | ASSERT(ifp->if_broot != NULL); | |
639 | ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <= | |
640 | XFS_IFORK_SIZE(ip, whichfork)); | |
641 | xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes, | |
642 | (xfs_bmdr_block_t *)cp, | |
643 | XFS_DFORK_SIZE(dip, mp, whichfork)); | |
644 | } | |
645 | break; | |
646 | ||
647 | case XFS_DINODE_FMT_DEV: | |
648 | if (iip->ili_fields & XFS_ILOG_DEV) { | |
649 | ASSERT(whichfork == XFS_DATA_FORK); | |
dc9b1f58 CH |
650 | xfs_dinode_put_rdev(dip, |
651 | linux_to_xfs_dev_t(VFS_I(ip)->i_rdev)); | |
5d90ab5a DC |
652 | } |
653 | break; | |
654 | ||
5d90ab5a DC |
655 | default: |
656 | ASSERT(0); | |
657 | break; | |
658 | } | |
659 | } | |
660 | ||
cb8a004a DW |
661 | /* Convert bmap state flags to an inode fork. */ |
662 | struct xfs_ifork * | |
663 | xfs_iext_state_to_fork( | |
664 | struct xfs_inode *ip, | |
665 | int state) | |
666 | { | |
667 | if (state & BMAP_COWFORK) | |
668 | return ip->i_cowfp; | |
669 | else if (state & BMAP_ATTRFORK) | |
670 | return ip->i_afp; | |
671 | return &ip->i_df; | |
672 | } | |
673 | ||
cb8a004a DW |
674 | /* |
675 | * Initialize an inode's copy-on-write fork. | |
676 | */ | |
677 | void | |
678 | xfs_ifork_init_cow( | |
679 | struct xfs_inode *ip) | |
680 | { | |
681 | if (ip->i_cowfp) | |
682 | return; | |
683 | ||
684 | ip->i_cowfp = kmem_zone_zalloc(xfs_ifork_zone, | |
685 | KM_SLEEP | KM_NOFS); | |
686 | ip->i_cowfp->if_flags = XFS_IFEXTENTS; | |
687 | ip->i_cformat = XFS_DINODE_FMT_EXTENTS; | |
688 | ip->i_cnextents = 0; | |
689 | } | |
20e882d4 DW |
690 | |
691 | /* Default fork content verifiers. */ | |
692 | struct xfs_ifork_ops xfs_default_ifork_ops = { | |
693 | .verify_attr = xfs_attr_shortform_verify, | |
694 | .verify_dir = xfs_dir2_sf_verify, | |
695 | .verify_symlink = xfs_symlink_shortform_verify, | |
696 | }; | |
697 | ||
698 | /* Verify the inline contents of the data fork of an inode. */ | |
699 | xfs_failaddr_t | |
700 | xfs_ifork_verify_data( | |
701 | struct xfs_inode *ip, | |
702 | struct xfs_ifork_ops *ops) | |
703 | { | |
704 | /* Non-local data fork, we're done. */ | |
705 | if (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL) | |
706 | return NULL; | |
707 | ||
708 | /* Check the inline data fork if there is one. */ | |
709 | switch (VFS_I(ip)->i_mode & S_IFMT) { | |
710 | case S_IFDIR: | |
711 | return ops->verify_dir(ip); | |
712 | case S_IFLNK: | |
713 | return ops->verify_symlink(ip); | |
714 | default: | |
715 | return NULL; | |
716 | } | |
717 | } | |
718 | ||
719 | /* Verify the inline contents of the attr fork of an inode. */ | |
720 | xfs_failaddr_t | |
721 | xfs_ifork_verify_attr( | |
722 | struct xfs_inode *ip, | |
723 | struct xfs_ifork_ops *ops) | |
724 | { | |
725 | /* There has to be an attr fork allocated if aformat is local. */ | |
726 | if (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) | |
727 | return NULL; | |
728 | if (!XFS_IFORK_PTR(ip, XFS_ATTR_FORK)) | |
729 | return __this_address; | |
730 | return ops->verify_attr(ip); | |
731 | } |