Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
27 | #include "xfs_dir.h" | |
28 | #include "xfs_dir2.h" | |
29 | #include "xfs_dmapi.h" | |
30 | #include "xfs_mount.h" | |
a844f451 | 31 | #include "xfs_da_btree.h" |
1da177e4 | 32 | #include "xfs_bmap_btree.h" |
a844f451 | 33 | #include "xfs_alloc_btree.h" |
1da177e4 LT |
34 | #include "xfs_ialloc_btree.h" |
35 | #include "xfs_alloc.h" | |
36 | #include "xfs_btree.h" | |
1da177e4 LT |
37 | #include "xfs_dir_sf.h" |
38 | #include "xfs_dir2_sf.h" | |
a844f451 | 39 | #include "xfs_attr_sf.h" |
1da177e4 | 40 | #include "xfs_dinode.h" |
1da177e4 | 41 | #include "xfs_inode.h" |
a844f451 | 42 | #include "xfs_inode_item.h" |
1da177e4 | 43 | #include "xfs_bmap.h" |
1da177e4 LT |
44 | #include "xfs_attr.h" |
45 | #include "xfs_attr_leaf.h" | |
46 | #include "xfs_error.h" | |
1da177e4 LT |
47 | |
48 | /* | |
49 | * xfs_attr_leaf.c | |
50 | * | |
51 | * Routines to implement leaf blocks of attributes as Btrees of hashed names. | |
52 | */ | |
53 | ||
54 | /*======================================================================== | |
55 | * Function prototypes for the kernel. | |
56 | *========================================================================*/ | |
57 | ||
58 | /* | |
59 | * Routines used for growing the Btree. | |
60 | */ | |
ba0f32d4 CH |
61 | STATIC int xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t which_block, |
62 | xfs_dabuf_t **bpp); | |
1da177e4 LT |
63 | STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args, |
64 | int freemap_index); | |
65 | STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer); | |
66 | STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state, | |
67 | xfs_da_state_blk_t *blk1, | |
68 | xfs_da_state_blk_t *blk2); | |
69 | STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state, | |
70 | xfs_da_state_blk_t *leaf_blk_1, | |
71 | xfs_da_state_blk_t *leaf_blk_2, | |
72 | int *number_entries_in_blk1, | |
73 | int *number_usedbytes_in_blk1); | |
74 | ||
ba0f32d4 CH |
75 | /* |
76 | * Routines used for shrinking the Btree. | |
77 | */ | |
78 | STATIC int xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, | |
79 | xfs_dabuf_t *bp, int level); | |
80 | STATIC int xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, | |
81 | xfs_dabuf_t *bp); | |
82 | STATIC int xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp, | |
83 | xfs_dablk_t blkno, int blkcnt); | |
84 | ||
1da177e4 LT |
85 | /* |
86 | * Utility routines. | |
87 | */ | |
88 | STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf, | |
89 | int src_start, | |
90 | xfs_attr_leafblock_t *dst_leaf, | |
91 | int dst_start, int move_count, | |
92 | xfs_mount_t *mp); | |
ba0f32d4 CH |
93 | STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index); |
94 | STATIC int xfs_attr_put_listent(xfs_attr_list_context_t *context, | |
95 | attrnames_t *, char *name, int namelen, | |
96 | int valuelen); | |
1da177e4 LT |
97 | |
98 | ||
99 | /*======================================================================== | |
d8cc890d | 100 | * External routines when attribute fork size < XFS_LITINO(mp). |
1da177e4 LT |
101 | *========================================================================*/ |
102 | ||
103 | /* | |
d8cc890d NS |
104 | * Query whether the requested number of additional bytes of extended |
105 | * attribute space will be able to fit inline. | |
106 | * Returns zero if not, else the di_forkoff fork offset to be used in the | |
107 | * literal area for attribute data once the new bytes have been added. | |
108 | * | |
109 | * di_forkoff must be 8 byte aligned, hence is stored as a >>3 value; | |
110 | * special case for dev/uuid inodes, they have fixed size data forks. | |
1da177e4 LT |
111 | */ |
112 | int | |
d8cc890d NS |
113 | xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes) |
114 | { | |
115 | int offset; | |
116 | int minforkoff; /* lower limit on valid forkoff locations */ | |
117 | int maxforkoff; /* upper limit on valid forkoff locations */ | |
118 | xfs_mount_t *mp = dp->i_mount; | |
119 | ||
d8cc890d NS |
120 | offset = (XFS_LITINO(mp) - bytes) >> 3; /* rounded down */ |
121 | ||
122 | switch (dp->i_d.di_format) { | |
123 | case XFS_DINODE_FMT_DEV: | |
124 | minforkoff = roundup(sizeof(xfs_dev_t), 8) >> 3; | |
125 | return (offset >= minforkoff) ? minforkoff : 0; | |
126 | case XFS_DINODE_FMT_UUID: | |
127 | minforkoff = roundup(sizeof(uuid_t), 8) >> 3; | |
128 | return (offset >= minforkoff) ? minforkoff : 0; | |
129 | } | |
130 | ||
da087bad NS |
131 | if (unlikely(mp->m_flags & XFS_MOUNT_COMPAT_ATTR)) { |
132 | if (bytes <= XFS_IFORK_ASIZE(dp)) | |
133 | return mp->m_attroffset >> 3; | |
134 | return 0; | |
135 | } | |
136 | ||
d8cc890d NS |
137 | /* data fork btree root can have at least this many key/ptr pairs */ |
138 | minforkoff = MAX(dp->i_df.if_bytes, XFS_BMDR_SPACE_CALC(MINDBTPTRS)); | |
139 | minforkoff = roundup(minforkoff, 8) >> 3; | |
140 | ||
141 | /* attr fork btree root can have at least this many key/ptr pairs */ | |
142 | maxforkoff = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS); | |
143 | maxforkoff = maxforkoff >> 3; /* rounded down */ | |
144 | ||
145 | if (offset >= minforkoff && offset < maxforkoff) | |
146 | return offset; | |
147 | if (offset >= maxforkoff) | |
148 | return maxforkoff; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Switch on the ATTR2 superblock bit (implies also FEATURES2) | |
154 | */ | |
155 | STATIC void | |
156 | xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp) | |
157 | { | |
158 | unsigned long s; | |
159 | ||
160 | if (!(mp->m_flags & XFS_MOUNT_COMPAT_ATTR) && | |
161 | !(XFS_SB_VERSION_HASATTR2(&mp->m_sb))) { | |
162 | s = XFS_SB_LOCK(mp); | |
163 | if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb)) { | |
164 | XFS_SB_VERSION_ADDATTR2(&mp->m_sb); | |
165 | XFS_SB_UNLOCK(mp, s); | |
166 | xfs_mod_sb(tp, XFS_SB_VERSIONNUM | XFS_SB_FEATURES2); | |
167 | } else | |
168 | XFS_SB_UNLOCK(mp, s); | |
169 | } | |
170 | } | |
171 | ||
172 | /* | |
173 | * Create the initial contents of a shortform attribute list. | |
174 | */ | |
175 | void | |
1da177e4 LT |
176 | xfs_attr_shortform_create(xfs_da_args_t *args) |
177 | { | |
178 | xfs_attr_sf_hdr_t *hdr; | |
179 | xfs_inode_t *dp; | |
180 | xfs_ifork_t *ifp; | |
181 | ||
182 | dp = args->dp; | |
183 | ASSERT(dp != NULL); | |
184 | ifp = dp->i_afp; | |
185 | ASSERT(ifp != NULL); | |
186 | ASSERT(ifp->if_bytes == 0); | |
187 | if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) { | |
188 | ifp->if_flags &= ~XFS_IFEXTENTS; /* just in case */ | |
189 | dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL; | |
190 | ifp->if_flags |= XFS_IFINLINE; | |
191 | } else { | |
192 | ASSERT(ifp->if_flags & XFS_IFINLINE); | |
193 | } | |
194 | xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK); | |
195 | hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data; | |
196 | hdr->count = 0; | |
197 | INT_SET(hdr->totsize, ARCH_CONVERT, sizeof(*hdr)); | |
198 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); | |
1da177e4 LT |
199 | } |
200 | ||
201 | /* | |
202 | * Add a name/value pair to the shortform attribute list. | |
203 | * Overflow from the inode has already been checked for. | |
204 | */ | |
d8cc890d NS |
205 | void |
206 | xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff) | |
1da177e4 LT |
207 | { |
208 | xfs_attr_shortform_t *sf; | |
209 | xfs_attr_sf_entry_t *sfe; | |
210 | int i, offset, size; | |
d8cc890d | 211 | xfs_mount_t *mp; |
1da177e4 LT |
212 | xfs_inode_t *dp; |
213 | xfs_ifork_t *ifp; | |
214 | ||
215 | dp = args->dp; | |
d8cc890d NS |
216 | mp = dp->i_mount; |
217 | dp->i_d.di_forkoff = forkoff; | |
218 | dp->i_df.if_ext_max = | |
219 | XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t); | |
220 | dp->i_afp->if_ext_max = | |
221 | XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t); | |
222 | ||
1da177e4 LT |
223 | ifp = dp->i_afp; |
224 | ASSERT(ifp->if_flags & XFS_IFINLINE); | |
225 | sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; | |
226 | sfe = &sf->list[0]; | |
227 | for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); | |
228 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) { | |
d8cc890d | 229 | #ifdef DEBUG |
1da177e4 LT |
230 | if (sfe->namelen != args->namelen) |
231 | continue; | |
232 | if (memcmp(args->name, sfe->nameval, args->namelen) != 0) | |
233 | continue; | |
234 | if (((args->flags & ATTR_SECURE) != 0) != | |
235 | ((sfe->flags & XFS_ATTR_SECURE) != 0)) | |
236 | continue; | |
237 | if (((args->flags & ATTR_ROOT) != 0) != | |
238 | ((sfe->flags & XFS_ATTR_ROOT) != 0)) | |
239 | continue; | |
d8cc890d NS |
240 | ASSERT(0); |
241 | #endif | |
1da177e4 LT |
242 | } |
243 | ||
244 | offset = (char *)sfe - (char *)sf; | |
245 | size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen); | |
246 | xfs_idata_realloc(dp, size, XFS_ATTR_FORK); | |
247 | sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; | |
248 | sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset); | |
249 | ||
250 | sfe->namelen = args->namelen; | |
251 | INT_SET(sfe->valuelen, ARCH_CONVERT, args->valuelen); | |
252 | sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE : | |
253 | ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0); | |
254 | memcpy(sfe->nameval, args->name, args->namelen); | |
255 | memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen); | |
256 | INT_MOD(sf->hdr.count, ARCH_CONVERT, 1); | |
257 | INT_MOD(sf->hdr.totsize, ARCH_CONVERT, size); | |
258 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); | |
259 | ||
d8cc890d | 260 | xfs_sbversion_add_attr2(mp, args->trans); |
1da177e4 LT |
261 | } |
262 | ||
263 | /* | |
d8cc890d | 264 | * Remove an attribute from the shortform attribute list structure. |
1da177e4 LT |
265 | */ |
266 | int | |
267 | xfs_attr_shortform_remove(xfs_da_args_t *args) | |
268 | { | |
269 | xfs_attr_shortform_t *sf; | |
270 | xfs_attr_sf_entry_t *sfe; | |
271 | int base, size=0, end, totsize, i; | |
d8cc890d | 272 | xfs_mount_t *mp; |
1da177e4 LT |
273 | xfs_inode_t *dp; |
274 | ||
1da177e4 | 275 | dp = args->dp; |
d8cc890d | 276 | mp = dp->i_mount; |
1da177e4 LT |
277 | base = sizeof(xfs_attr_sf_hdr_t); |
278 | sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data; | |
279 | sfe = &sf->list[0]; | |
d8cc890d NS |
280 | end = INT_GET(sf->hdr.count, ARCH_CONVERT); |
281 | for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), | |
1da177e4 LT |
282 | base += size, i++) { |
283 | size = XFS_ATTR_SF_ENTSIZE(sfe); | |
284 | if (sfe->namelen != args->namelen) | |
285 | continue; | |
286 | if (memcmp(sfe->nameval, args->name, args->namelen) != 0) | |
287 | continue; | |
288 | if (((args->flags & ATTR_SECURE) != 0) != | |
289 | ((sfe->flags & XFS_ATTR_SECURE) != 0)) | |
290 | continue; | |
291 | if (((args->flags & ATTR_ROOT) != 0) != | |
292 | ((sfe->flags & XFS_ATTR_ROOT) != 0)) | |
293 | continue; | |
294 | break; | |
295 | } | |
d8cc890d | 296 | if (i == end) |
1da177e4 LT |
297 | return(XFS_ERROR(ENOATTR)); |
298 | ||
d8cc890d NS |
299 | /* |
300 | * Fix up the attribute fork data, covering the hole | |
301 | */ | |
1da177e4 LT |
302 | end = base + size; |
303 | totsize = INT_GET(sf->hdr.totsize, ARCH_CONVERT); | |
d8cc890d NS |
304 | if (end != totsize) |
305 | memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end); | |
1da177e4 LT |
306 | INT_MOD(sf->hdr.count, ARCH_CONVERT, -1); |
307 | INT_MOD(sf->hdr.totsize, ARCH_CONVERT, -size); | |
d8cc890d NS |
308 | |
309 | /* | |
310 | * Fix up the start offset of the attribute fork | |
311 | */ | |
312 | totsize -= size; | |
313 | if (totsize == sizeof(xfs_attr_sf_hdr_t) && !args->addname) { | |
314 | /* | |
315 | * Last attribute now removed, revert to original | |
316 | * inode format making all literal area available | |
317 | * to the data fork once more. | |
318 | */ | |
319 | xfs_idestroy_fork(dp, XFS_ATTR_FORK); | |
320 | dp->i_d.di_forkoff = 0; | |
321 | dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; | |
322 | ASSERT(dp->i_d.di_anextents == 0); | |
323 | ASSERT(dp->i_afp == NULL); | |
324 | dp->i_df.if_ext_max = | |
325 | XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t); | |
326 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); | |
327 | } else { | |
328 | xfs_idata_realloc(dp, -size, XFS_ATTR_FORK); | |
329 | dp->i_d.di_forkoff = xfs_attr_shortform_bytesfit(dp, totsize); | |
330 | ASSERT(dp->i_d.di_forkoff); | |
331 | ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) || args->addname); | |
332 | dp->i_afp->if_ext_max = | |
333 | XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t); | |
334 | dp->i_df.if_ext_max = | |
335 | XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t); | |
336 | xfs_trans_log_inode(args->trans, dp, | |
337 | XFS_ILOG_CORE | XFS_ILOG_ADATA); | |
338 | } | |
339 | ||
340 | xfs_sbversion_add_attr2(mp, args->trans); | |
1da177e4 LT |
341 | |
342 | return(0); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Look up a name in a shortform attribute list structure. | |
347 | */ | |
348 | /*ARGSUSED*/ | |
349 | int | |
350 | xfs_attr_shortform_lookup(xfs_da_args_t *args) | |
351 | { | |
352 | xfs_attr_shortform_t *sf; | |
353 | xfs_attr_sf_entry_t *sfe; | |
354 | int i; | |
355 | xfs_ifork_t *ifp; | |
356 | ||
357 | ifp = args->dp->i_afp; | |
358 | ASSERT(ifp->if_flags & XFS_IFINLINE); | |
359 | sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; | |
360 | sfe = &sf->list[0]; | |
361 | for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); | |
362 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) { | |
363 | if (sfe->namelen != args->namelen) | |
364 | continue; | |
365 | if (memcmp(args->name, sfe->nameval, args->namelen) != 0) | |
366 | continue; | |
367 | if (((args->flags & ATTR_SECURE) != 0) != | |
368 | ((sfe->flags & XFS_ATTR_SECURE) != 0)) | |
369 | continue; | |
370 | if (((args->flags & ATTR_ROOT) != 0) != | |
371 | ((sfe->flags & XFS_ATTR_ROOT) != 0)) | |
372 | continue; | |
373 | return(XFS_ERROR(EEXIST)); | |
374 | } | |
375 | return(XFS_ERROR(ENOATTR)); | |
376 | } | |
377 | ||
378 | /* | |
379 | * Look up a name in a shortform attribute list structure. | |
380 | */ | |
381 | /*ARGSUSED*/ | |
382 | int | |
383 | xfs_attr_shortform_getvalue(xfs_da_args_t *args) | |
384 | { | |
385 | xfs_attr_shortform_t *sf; | |
386 | xfs_attr_sf_entry_t *sfe; | |
387 | int i; | |
388 | ||
389 | ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE); | |
390 | sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data; | |
391 | sfe = &sf->list[0]; | |
392 | for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); | |
393 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) { | |
394 | if (sfe->namelen != args->namelen) | |
395 | continue; | |
396 | if (memcmp(args->name, sfe->nameval, args->namelen) != 0) | |
397 | continue; | |
398 | if (((args->flags & ATTR_SECURE) != 0) != | |
399 | ((sfe->flags & XFS_ATTR_SECURE) != 0)) | |
400 | continue; | |
401 | if (((args->flags & ATTR_ROOT) != 0) != | |
402 | ((sfe->flags & XFS_ATTR_ROOT) != 0)) | |
403 | continue; | |
404 | if (args->flags & ATTR_KERNOVAL) { | |
405 | args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); | |
406 | return(XFS_ERROR(EEXIST)); | |
407 | } | |
408 | if (args->valuelen < INT_GET(sfe->valuelen, ARCH_CONVERT)) { | |
409 | args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); | |
410 | return(XFS_ERROR(ERANGE)); | |
411 | } | |
412 | args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); | |
413 | memcpy(args->value, &sfe->nameval[args->namelen], | |
414 | args->valuelen); | |
415 | return(XFS_ERROR(EEXIST)); | |
416 | } | |
417 | return(XFS_ERROR(ENOATTR)); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Convert from using the shortform to the leaf. | |
422 | */ | |
423 | int | |
424 | xfs_attr_shortform_to_leaf(xfs_da_args_t *args) | |
425 | { | |
426 | xfs_inode_t *dp; | |
427 | xfs_attr_shortform_t *sf; | |
428 | xfs_attr_sf_entry_t *sfe; | |
429 | xfs_da_args_t nargs; | |
430 | char *tmpbuffer; | |
431 | int error, i, size; | |
432 | xfs_dablk_t blkno; | |
433 | xfs_dabuf_t *bp; | |
434 | xfs_ifork_t *ifp; | |
435 | ||
436 | dp = args->dp; | |
437 | ifp = dp->i_afp; | |
438 | sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; | |
439 | size = INT_GET(sf->hdr.totsize, ARCH_CONVERT); | |
440 | tmpbuffer = kmem_alloc(size, KM_SLEEP); | |
441 | ASSERT(tmpbuffer != NULL); | |
442 | memcpy(tmpbuffer, ifp->if_u1.if_data, size); | |
443 | sf = (xfs_attr_shortform_t *)tmpbuffer; | |
444 | ||
445 | xfs_idata_realloc(dp, -size, XFS_ATTR_FORK); | |
446 | bp = NULL; | |
447 | error = xfs_da_grow_inode(args, &blkno); | |
448 | if (error) { | |
449 | /* | |
450 | * If we hit an IO error middle of the transaction inside | |
451 | * grow_inode(), we may have inconsistent data. Bail out. | |
452 | */ | |
453 | if (error == EIO) | |
454 | goto out; | |
455 | xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */ | |
456 | memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */ | |
457 | goto out; | |
458 | } | |
459 | ||
460 | ASSERT(blkno == 0); | |
461 | error = xfs_attr_leaf_create(args, blkno, &bp); | |
462 | if (error) { | |
463 | error = xfs_da_shrink_inode(args, 0, bp); | |
464 | bp = NULL; | |
465 | if (error) | |
466 | goto out; | |
467 | xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */ | |
468 | memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */ | |
469 | goto out; | |
470 | } | |
471 | ||
472 | memset((char *)&nargs, 0, sizeof(nargs)); | |
473 | nargs.dp = dp; | |
474 | nargs.firstblock = args->firstblock; | |
475 | nargs.flist = args->flist; | |
476 | nargs.total = args->total; | |
477 | nargs.whichfork = XFS_ATTR_FORK; | |
478 | nargs.trans = args->trans; | |
479 | nargs.oknoent = 1; | |
480 | ||
481 | sfe = &sf->list[0]; | |
482 | for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { | |
483 | nargs.name = (char *)sfe->nameval; | |
484 | nargs.namelen = sfe->namelen; | |
485 | nargs.value = (char *)&sfe->nameval[nargs.namelen]; | |
486 | nargs.valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); | |
487 | nargs.hashval = xfs_da_hashname((char *)sfe->nameval, | |
488 | sfe->namelen); | |
489 | nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE : | |
490 | ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0); | |
491 | error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */ | |
492 | ASSERT(error == ENOATTR); | |
493 | error = xfs_attr_leaf_add(bp, &nargs); | |
494 | ASSERT(error != ENOSPC); | |
495 | if (error) | |
496 | goto out; | |
497 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
498 | } | |
499 | error = 0; | |
500 | ||
501 | out: | |
502 | if(bp) | |
503 | xfs_da_buf_done(bp); | |
504 | kmem_free(tmpbuffer, size); | |
505 | return(error); | |
506 | } | |
507 | ||
508 | STATIC int | |
509 | xfs_attr_shortform_compare(const void *a, const void *b) | |
510 | { | |
511 | xfs_attr_sf_sort_t *sa, *sb; | |
512 | ||
513 | sa = (xfs_attr_sf_sort_t *)a; | |
514 | sb = (xfs_attr_sf_sort_t *)b; | |
515 | if (INT_GET(sa->hash, ARCH_CONVERT) | |
516 | < INT_GET(sb->hash, ARCH_CONVERT)) { | |
517 | return(-1); | |
518 | } else if (INT_GET(sa->hash, ARCH_CONVERT) | |
519 | > INT_GET(sb->hash, ARCH_CONVERT)) { | |
520 | return(1); | |
521 | } else { | |
522 | return(sa->entno - sb->entno); | |
523 | } | |
524 | } | |
525 | ||
526 | /* | |
527 | * Copy out entries of shortform attribute lists for attr_list(). | |
528 | * Shortform atrtribute lists are not stored in hashval sorted order. | |
529 | * If the output buffer is not large enough to hold them all, then we | |
530 | * we have to calculate each entries' hashvalue and sort them before | |
531 | * we can begin returning them to the user. | |
532 | */ | |
533 | /*ARGSUSED*/ | |
534 | int | |
535 | xfs_attr_shortform_list(xfs_attr_list_context_t *context) | |
536 | { | |
537 | attrlist_cursor_kern_t *cursor; | |
538 | xfs_attr_sf_sort_t *sbuf, *sbp; | |
539 | xfs_attr_shortform_t *sf; | |
540 | xfs_attr_sf_entry_t *sfe; | |
541 | xfs_inode_t *dp; | |
542 | int sbsize, nsbuf, count, i; | |
543 | ||
544 | ASSERT(context != NULL); | |
545 | dp = context->dp; | |
546 | ASSERT(dp != NULL); | |
547 | ASSERT(dp->i_afp != NULL); | |
548 | sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data; | |
549 | ASSERT(sf != NULL); | |
550 | if (!sf->hdr.count) | |
551 | return(0); | |
552 | cursor = context->cursor; | |
553 | ASSERT(cursor != NULL); | |
554 | ||
555 | xfs_attr_trace_l_c("sf start", context); | |
556 | ||
557 | /* | |
558 | * If the buffer is large enough, do not bother with sorting. | |
559 | * Note the generous fudge factor of 16 overhead bytes per entry. | |
560 | */ | |
561 | if ((dp->i_afp->if_bytes + INT_GET(sf->hdr.count, ARCH_CONVERT) * 16) | |
562 | < context->bufsize) { | |
563 | for (i = 0, sfe = &sf->list[0]; | |
564 | i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { | |
565 | attrnames_t *namesp; | |
566 | ||
567 | if (((context->flags & ATTR_SECURE) != 0) != | |
568 | ((sfe->flags & XFS_ATTR_SECURE) != 0) && | |
569 | !(context->flags & ATTR_KERNORMALS)) { | |
570 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
571 | continue; | |
572 | } | |
573 | if (((context->flags & ATTR_ROOT) != 0) != | |
574 | ((sfe->flags & XFS_ATTR_ROOT) != 0) && | |
575 | !(context->flags & ATTR_KERNROOTLS)) { | |
576 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
577 | continue; | |
578 | } | |
579 | namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure: | |
580 | ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted : | |
581 | &attr_user); | |
582 | if (context->flags & ATTR_KERNOVAL) { | |
583 | ASSERT(context->flags & ATTR_KERNAMELS); | |
584 | context->count += namesp->attr_namelen + | |
585 | INT_GET(sfe->namelen, ARCH_CONVERT) + 1; | |
586 | } | |
587 | else { | |
588 | if (xfs_attr_put_listent(context, namesp, | |
589 | (char *)sfe->nameval, | |
590 | (int)sfe->namelen, | |
591 | (int)INT_GET(sfe->valuelen, | |
592 | ARCH_CONVERT))) | |
593 | break; | |
594 | } | |
595 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
596 | } | |
597 | xfs_attr_trace_l_c("sf big-gulp", context); | |
598 | return(0); | |
599 | } | |
600 | ||
601 | /* | |
602 | * It didn't all fit, so we have to sort everything on hashval. | |
603 | */ | |
604 | sbsize = INT_GET(sf->hdr.count, ARCH_CONVERT) * sizeof(*sbuf); | |
605 | sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP); | |
606 | ||
607 | /* | |
608 | * Scan the attribute list for the rest of the entries, storing | |
609 | * the relevant info from only those that match into a buffer. | |
610 | */ | |
611 | nsbuf = 0; | |
612 | for (i = 0, sfe = &sf->list[0]; | |
613 | i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { | |
614 | if (unlikely( | |
615 | ((char *)sfe < (char *)sf) || | |
616 | ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) { | |
617 | XFS_CORRUPTION_ERROR("xfs_attr_shortform_list", | |
618 | XFS_ERRLEVEL_LOW, | |
619 | context->dp->i_mount, sfe); | |
620 | xfs_attr_trace_l_c("sf corrupted", context); | |
621 | kmem_free(sbuf, sbsize); | |
622 | return XFS_ERROR(EFSCORRUPTED); | |
623 | } | |
624 | if (((context->flags & ATTR_SECURE) != 0) != | |
625 | ((sfe->flags & XFS_ATTR_SECURE) != 0) && | |
626 | !(context->flags & ATTR_KERNORMALS)) { | |
627 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
628 | continue; | |
629 | } | |
630 | if (((context->flags & ATTR_ROOT) != 0) != | |
631 | ((sfe->flags & XFS_ATTR_ROOT) != 0) && | |
632 | !(context->flags & ATTR_KERNROOTLS)) { | |
633 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
634 | continue; | |
635 | } | |
636 | sbp->entno = i; | |
637 | INT_SET(sbp->hash, ARCH_CONVERT, | |
638 | xfs_da_hashname((char *)sfe->nameval, sfe->namelen)); | |
639 | sbp->name = (char *)sfe->nameval; | |
640 | sbp->namelen = sfe->namelen; | |
641 | /* These are bytes, and both on-disk, don't endian-flip */ | |
642 | sbp->valuelen = sfe->valuelen; | |
643 | sbp->flags = sfe->flags; | |
644 | sfe = XFS_ATTR_SF_NEXTENTRY(sfe); | |
645 | sbp++; | |
646 | nsbuf++; | |
647 | } | |
648 | ||
649 | /* | |
650 | * Sort the entries on hash then entno. | |
651 | */ | |
380b5dc0 | 652 | xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare); |
1da177e4 LT |
653 | |
654 | /* | |
655 | * Re-find our place IN THE SORTED LIST. | |
656 | */ | |
657 | count = 0; | |
658 | cursor->initted = 1; | |
659 | cursor->blkno = 0; | |
660 | for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) { | |
661 | if (INT_GET(sbp->hash, ARCH_CONVERT) == cursor->hashval) { | |
662 | if (cursor->offset == count) { | |
663 | break; | |
664 | } | |
665 | count++; | |
666 | } else if (INT_GET(sbp->hash, ARCH_CONVERT) > cursor->hashval) { | |
667 | break; | |
668 | } | |
669 | } | |
670 | if (i == nsbuf) { | |
671 | kmem_free(sbuf, sbsize); | |
672 | xfs_attr_trace_l_c("blk end", context); | |
673 | return(0); | |
674 | } | |
675 | ||
676 | /* | |
677 | * Loop putting entries into the user buffer. | |
678 | */ | |
679 | for ( ; i < nsbuf; i++, sbp++) { | |
680 | attrnames_t *namesp; | |
681 | ||
682 | namesp = (sbp->flags & XFS_ATTR_SECURE) ? &attr_secure : | |
683 | ((sbp->flags & XFS_ATTR_ROOT) ? &attr_trusted : | |
684 | &attr_user); | |
685 | ||
686 | if (cursor->hashval != INT_GET(sbp->hash, ARCH_CONVERT)) { | |
687 | cursor->hashval = INT_GET(sbp->hash, ARCH_CONVERT); | |
688 | cursor->offset = 0; | |
689 | } | |
690 | if (context->flags & ATTR_KERNOVAL) { | |
691 | ASSERT(context->flags & ATTR_KERNAMELS); | |
692 | context->count += namesp->attr_namelen + | |
693 | sbp->namelen + 1; | |
694 | } else { | |
695 | if (xfs_attr_put_listent(context, namesp, | |
696 | sbp->name, sbp->namelen, | |
697 | INT_GET(sbp->valuelen, ARCH_CONVERT))) | |
698 | break; | |
699 | } | |
700 | cursor->offset++; | |
701 | } | |
702 | ||
703 | kmem_free(sbuf, sbsize); | |
704 | xfs_attr_trace_l_c("sf E-O-F", context); | |
705 | return(0); | |
706 | } | |
707 | ||
708 | /* | |
709 | * Check a leaf attribute block to see if all the entries would fit into | |
710 | * a shortform attribute list. | |
711 | */ | |
712 | int | |
713 | xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp) | |
714 | { | |
715 | xfs_attr_leafblock_t *leaf; | |
716 | xfs_attr_leaf_entry_t *entry; | |
717 | xfs_attr_leaf_name_local_t *name_loc; | |
718 | int bytes, i; | |
719 | ||
720 | leaf = bp->data; | |
721 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
722 | == XFS_ATTR_LEAF_MAGIC); | |
723 | ||
724 | entry = &leaf->entries[0]; | |
725 | bytes = sizeof(struct xfs_attr_sf_hdr); | |
726 | for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { | |
727 | if (entry->flags & XFS_ATTR_INCOMPLETE) | |
728 | continue; /* don't copy partial entries */ | |
729 | if (!(entry->flags & XFS_ATTR_LOCAL)) | |
730 | return(0); | |
731 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); | |
732 | if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX) | |
733 | return(0); | |
734 | if (INT_GET(name_loc->valuelen, ARCH_CONVERT) >= XFS_ATTR_SF_ENTSIZE_MAX) | |
735 | return(0); | |
736 | bytes += sizeof(struct xfs_attr_sf_entry)-1 | |
737 | + name_loc->namelen | |
738 | + INT_GET(name_loc->valuelen, ARCH_CONVERT); | |
739 | } | |
d8cc890d NS |
740 | if (bytes == sizeof(struct xfs_attr_sf_hdr)) |
741 | return(-1); | |
742 | return(xfs_attr_shortform_bytesfit(dp, bytes)); | |
1da177e4 LT |
743 | } |
744 | ||
745 | /* | |
746 | * Convert a leaf attribute list to shortform attribute list | |
747 | */ | |
748 | int | |
d8cc890d | 749 | xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args, int forkoff) |
1da177e4 LT |
750 | { |
751 | xfs_attr_leafblock_t *leaf; | |
752 | xfs_attr_leaf_entry_t *entry; | |
753 | xfs_attr_leaf_name_local_t *name_loc; | |
754 | xfs_da_args_t nargs; | |
755 | xfs_inode_t *dp; | |
756 | char *tmpbuffer; | |
757 | int error, i; | |
758 | ||
759 | dp = args->dp; | |
760 | tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP); | |
761 | ASSERT(tmpbuffer != NULL); | |
762 | ||
763 | ASSERT(bp != NULL); | |
764 | memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount)); | |
765 | leaf = (xfs_attr_leafblock_t *)tmpbuffer; | |
766 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
767 | == XFS_ATTR_LEAF_MAGIC); | |
768 | memset(bp->data, 0, XFS_LBSIZE(dp->i_mount)); | |
769 | ||
770 | /* | |
771 | * Clean out the prior contents of the attribute list. | |
772 | */ | |
773 | error = xfs_da_shrink_inode(args, 0, bp); | |
774 | if (error) | |
775 | goto out; | |
d8cc890d NS |
776 | |
777 | if (forkoff == -1) { | |
778 | /* | |
779 | * Last attribute was removed, revert to original | |
780 | * inode format making all literal area available | |
781 | * to the data fork once more. | |
782 | */ | |
783 | xfs_idestroy_fork(dp, XFS_ATTR_FORK); | |
784 | dp->i_d.di_forkoff = 0; | |
785 | dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; | |
786 | ASSERT(dp->i_d.di_anextents == 0); | |
787 | ASSERT(dp->i_afp == NULL); | |
788 | dp->i_df.if_ext_max = | |
789 | XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t); | |
790 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); | |
1da177e4 | 791 | goto out; |
d8cc890d NS |
792 | } |
793 | ||
794 | xfs_attr_shortform_create(args); | |
1da177e4 LT |
795 | |
796 | /* | |
797 | * Copy the attributes | |
798 | */ | |
799 | memset((char *)&nargs, 0, sizeof(nargs)); | |
800 | nargs.dp = dp; | |
801 | nargs.firstblock = args->firstblock; | |
802 | nargs.flist = args->flist; | |
803 | nargs.total = args->total; | |
804 | nargs.whichfork = XFS_ATTR_FORK; | |
805 | nargs.trans = args->trans; | |
806 | nargs.oknoent = 1; | |
807 | entry = &leaf->entries[0]; | |
808 | for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { | |
809 | if (entry->flags & XFS_ATTR_INCOMPLETE) | |
810 | continue; /* don't copy partial entries */ | |
811 | if (!entry->nameidx) | |
812 | continue; | |
813 | ASSERT(entry->flags & XFS_ATTR_LOCAL); | |
814 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); | |
815 | nargs.name = (char *)name_loc->nameval; | |
816 | nargs.namelen = name_loc->namelen; | |
817 | nargs.value = (char *)&name_loc->nameval[nargs.namelen]; | |
818 | nargs.valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT); | |
819 | nargs.hashval = INT_GET(entry->hashval, ARCH_CONVERT); | |
820 | nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE : | |
821 | ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0); | |
d8cc890d | 822 | xfs_attr_shortform_add(&nargs, forkoff); |
1da177e4 LT |
823 | } |
824 | error = 0; | |
825 | ||
826 | out: | |
827 | kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount)); | |
828 | return(error); | |
829 | } | |
830 | ||
831 | /* | |
832 | * Convert from using a single leaf to a root node and a leaf. | |
833 | */ | |
834 | int | |
835 | xfs_attr_leaf_to_node(xfs_da_args_t *args) | |
836 | { | |
837 | xfs_attr_leafblock_t *leaf; | |
838 | xfs_da_intnode_t *node; | |
839 | xfs_inode_t *dp; | |
840 | xfs_dabuf_t *bp1, *bp2; | |
841 | xfs_dablk_t blkno; | |
842 | int error; | |
843 | ||
844 | dp = args->dp; | |
845 | bp1 = bp2 = NULL; | |
846 | error = xfs_da_grow_inode(args, &blkno); | |
847 | if (error) | |
848 | goto out; | |
849 | error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1, | |
850 | XFS_ATTR_FORK); | |
851 | if (error) | |
852 | goto out; | |
853 | ASSERT(bp1 != NULL); | |
854 | bp2 = NULL; | |
855 | error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2, | |
856 | XFS_ATTR_FORK); | |
857 | if (error) | |
858 | goto out; | |
859 | ASSERT(bp2 != NULL); | |
860 | memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount)); | |
861 | xfs_da_buf_done(bp1); | |
862 | bp1 = NULL; | |
863 | xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1); | |
864 | ||
865 | /* | |
866 | * Set up the new root node. | |
867 | */ | |
868 | error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK); | |
869 | if (error) | |
870 | goto out; | |
871 | node = bp1->data; | |
872 | leaf = bp2->data; | |
873 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
874 | == XFS_ATTR_LEAF_MAGIC); | |
875 | /* both on-disk, don't endian-flip twice */ | |
876 | node->btree[0].hashval = | |
877 | leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval; | |
878 | INT_SET(node->btree[0].before, ARCH_CONVERT, blkno); | |
879 | INT_SET(node->hdr.count, ARCH_CONVERT, 1); | |
880 | xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1); | |
881 | error = 0; | |
882 | out: | |
883 | if (bp1) | |
884 | xfs_da_buf_done(bp1); | |
885 | if (bp2) | |
886 | xfs_da_buf_done(bp2); | |
887 | return(error); | |
888 | } | |
889 | ||
890 | ||
891 | /*======================================================================== | |
892 | * Routines used for growing the Btree. | |
893 | *========================================================================*/ | |
894 | ||
895 | /* | |
896 | * Create the initial contents of a leaf attribute list | |
897 | * or a leaf in a node attribute list. | |
898 | */ | |
ba0f32d4 | 899 | STATIC int |
1da177e4 LT |
900 | xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp) |
901 | { | |
902 | xfs_attr_leafblock_t *leaf; | |
903 | xfs_attr_leaf_hdr_t *hdr; | |
904 | xfs_inode_t *dp; | |
905 | xfs_dabuf_t *bp; | |
906 | int error; | |
907 | ||
908 | dp = args->dp; | |
909 | ASSERT(dp != NULL); | |
910 | error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp, | |
911 | XFS_ATTR_FORK); | |
912 | if (error) | |
913 | return(error); | |
914 | ASSERT(bp != NULL); | |
915 | leaf = bp->data; | |
916 | memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount)); | |
917 | hdr = &leaf->hdr; | |
918 | INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_ATTR_LEAF_MAGIC); | |
919 | INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount)); | |
920 | if (!hdr->firstused) { | |
921 | INT_SET(hdr->firstused, ARCH_CONVERT, | |
922 | XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN); | |
923 | } | |
924 | ||
925 | INT_SET(hdr->freemap[0].base, ARCH_CONVERT, | |
926 | sizeof(xfs_attr_leaf_hdr_t)); | |
927 | INT_SET(hdr->freemap[0].size, ARCH_CONVERT, | |
928 | INT_GET(hdr->firstused, ARCH_CONVERT) | |
929 | - INT_GET(hdr->freemap[0].base, | |
930 | ARCH_CONVERT)); | |
931 | ||
932 | xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1); | |
933 | ||
934 | *bpp = bp; | |
935 | return(0); | |
936 | } | |
937 | ||
938 | /* | |
939 | * Split the leaf node, rebalance, then add the new entry. | |
940 | */ | |
941 | int | |
942 | xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, | |
943 | xfs_da_state_blk_t *newblk) | |
944 | { | |
945 | xfs_dablk_t blkno; | |
946 | int error; | |
947 | ||
948 | /* | |
949 | * Allocate space for a new leaf node. | |
950 | */ | |
951 | ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC); | |
952 | error = xfs_da_grow_inode(state->args, &blkno); | |
953 | if (error) | |
954 | return(error); | |
955 | error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp); | |
956 | if (error) | |
957 | return(error); | |
958 | newblk->blkno = blkno; | |
959 | newblk->magic = XFS_ATTR_LEAF_MAGIC; | |
960 | ||
961 | /* | |
962 | * Rebalance the entries across the two leaves. | |
963 | * NOTE: rebalance() currently depends on the 2nd block being empty. | |
964 | */ | |
965 | xfs_attr_leaf_rebalance(state, oldblk, newblk); | |
966 | error = xfs_da_blk_link(state, oldblk, newblk); | |
967 | if (error) | |
968 | return(error); | |
969 | ||
970 | /* | |
971 | * Save info on "old" attribute for "atomic rename" ops, leaf_add() | |
972 | * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the | |
973 | * "new" attrs info. Will need the "old" info to remove it later. | |
974 | * | |
975 | * Insert the "new" entry in the correct block. | |
976 | */ | |
977 | if (state->inleaf) | |
978 | error = xfs_attr_leaf_add(oldblk->bp, state->args); | |
979 | else | |
980 | error = xfs_attr_leaf_add(newblk->bp, state->args); | |
981 | ||
982 | /* | |
983 | * Update last hashval in each block since we added the name. | |
984 | */ | |
985 | oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL); | |
986 | newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL); | |
987 | return(error); | |
988 | } | |
989 | ||
990 | /* | |
991 | * Add a name to the leaf attribute list structure. | |
992 | */ | |
993 | int | |
994 | xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args) | |
995 | { | |
996 | xfs_attr_leafblock_t *leaf; | |
997 | xfs_attr_leaf_hdr_t *hdr; | |
998 | xfs_attr_leaf_map_t *map; | |
999 | int tablesize, entsize, sum, tmp, i; | |
1000 | ||
1001 | leaf = bp->data; | |
1002 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
1003 | == XFS_ATTR_LEAF_MAGIC); | |
1004 | ASSERT((args->index >= 0) | |
1005 | && (args->index <= INT_GET(leaf->hdr.count, ARCH_CONVERT))); | |
1006 | hdr = &leaf->hdr; | |
aa82daa0 | 1007 | entsize = xfs_attr_leaf_newentsize(args->namelen, args->valuelen, |
1da177e4 LT |
1008 | args->trans->t_mountp->m_sb.sb_blocksize, NULL); |
1009 | ||
1010 | /* | |
1011 | * Search through freemap for first-fit on new name length. | |
1012 | * (may need to figure in size of entry struct too) | |
1013 | */ | |
1014 | tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1) | |
1015 | * sizeof(xfs_attr_leaf_entry_t) | |
1016 | + sizeof(xfs_attr_leaf_hdr_t); | |
1017 | map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1]; | |
1018 | for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) { | |
1019 | if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) { | |
1020 | sum += INT_GET(map->size, ARCH_CONVERT); | |
1021 | continue; | |
1022 | } | |
1023 | if (!map->size) | |
1024 | continue; /* no space in this map */ | |
1025 | tmp = entsize; | |
1026 | if (INT_GET(map->base, ARCH_CONVERT) | |
1027 | < INT_GET(hdr->firstused, ARCH_CONVERT)) | |
1028 | tmp += sizeof(xfs_attr_leaf_entry_t); | |
1029 | if (INT_GET(map->size, ARCH_CONVERT) >= tmp) { | |
1030 | tmp = xfs_attr_leaf_add_work(bp, args, i); | |
1031 | return(tmp); | |
1032 | } | |
1033 | sum += INT_GET(map->size, ARCH_CONVERT); | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * If there are no holes in the address space of the block, | |
1038 | * and we don't have enough freespace, then compaction will do us | |
1039 | * no good and we should just give up. | |
1040 | */ | |
1041 | if (!hdr->holes && (sum < entsize)) | |
1042 | return(XFS_ERROR(ENOSPC)); | |
1043 | ||
1044 | /* | |
1045 | * Compact the entries to coalesce free space. | |
1046 | * This may change the hdr->count via dropping INCOMPLETE entries. | |
1047 | */ | |
1048 | xfs_attr_leaf_compact(args->trans, bp); | |
1049 | ||
1050 | /* | |
1051 | * After compaction, the block is guaranteed to have only one | |
1052 | * free region, in freemap[0]. If it is not big enough, give up. | |
1053 | */ | |
1054 | if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT) | |
1055 | < (entsize + sizeof(xfs_attr_leaf_entry_t))) | |
1056 | return(XFS_ERROR(ENOSPC)); | |
1057 | ||
1058 | return(xfs_attr_leaf_add_work(bp, args, 0)); | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Add a name to a leaf attribute list structure. | |
1063 | */ | |
1064 | STATIC int | |
1065 | xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex) | |
1066 | { | |
1067 | xfs_attr_leafblock_t *leaf; | |
1068 | xfs_attr_leaf_hdr_t *hdr; | |
1069 | xfs_attr_leaf_entry_t *entry; | |
1070 | xfs_attr_leaf_name_local_t *name_loc; | |
1071 | xfs_attr_leaf_name_remote_t *name_rmt; | |
1072 | xfs_attr_leaf_map_t *map; | |
1073 | xfs_mount_t *mp; | |
1074 | int tmp, i; | |
1075 | ||
1076 | leaf = bp->data; | |
1077 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
1078 | == XFS_ATTR_LEAF_MAGIC); | |
1079 | hdr = &leaf->hdr; | |
1080 | ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE)); | |
1081 | ASSERT((args->index >= 0) | |
1082 | && (args->index <= INT_GET(hdr->count, ARCH_CONVERT))); | |
1083 | ||
1084 | /* | |
1085 | * Force open some space in the entry array and fill it in. | |
1086 | */ | |
1087 | entry = &leaf->entries[args->index]; | |
1088 | if (args->index < INT_GET(hdr->count, ARCH_CONVERT)) { | |
1089 | tmp = INT_GET(hdr->count, ARCH_CONVERT) - args->index; | |
1090 | tmp *= sizeof(xfs_attr_leaf_entry_t); | |
1091 | memmove((char *)(entry+1), (char *)entry, tmp); | |
1092 | xfs_da_log_buf(args->trans, bp, | |
1093 | XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry))); | |
1094 | } | |
1095 | INT_MOD(hdr->count, ARCH_CONVERT, 1); | |
1096 | ||
1097 | /* | |
1098 | * Allocate space for the new string (at the end of the run). | |
1099 | */ | |
1100 | map = &hdr->freemap[mapindex]; | |
1101 | mp = args->trans->t_mountp; | |
1102 | ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp)); | |
1103 | ASSERT((INT_GET(map->base, ARCH_CONVERT) & 0x3) == 0); | |
aa82daa0 NS |
1104 | ASSERT(INT_GET(map->size, ARCH_CONVERT) >= |
1105 | xfs_attr_leaf_newentsize(args->namelen, args->valuelen, | |
1106 | mp->m_sb.sb_blocksize, NULL)); | |
1da177e4 LT |
1107 | ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp)); |
1108 | ASSERT((INT_GET(map->size, ARCH_CONVERT) & 0x3) == 0); | |
1109 | INT_MOD(map->size, ARCH_CONVERT, | |
aa82daa0 NS |
1110 | -xfs_attr_leaf_newentsize(args->namelen, args->valuelen, |
1111 | mp->m_sb.sb_blocksize, &tmp)); | |
1da177e4 LT |
1112 | INT_SET(entry->nameidx, ARCH_CONVERT, |
1113 | INT_GET(map->base, ARCH_CONVERT) | |
1114 | + INT_GET(map->size, ARCH_CONVERT)); | |
1115 | INT_SET(entry->hashval, ARCH_CONVERT, args->hashval); | |
1116 | entry->flags = tmp ? XFS_ATTR_LOCAL : 0; | |
1117 | entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE : | |
1118 | ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0); | |
1119 | if (args->rename) { | |
1120 | entry->flags |= XFS_ATTR_INCOMPLETE; | |
1121 | if ((args->blkno2 == args->blkno) && | |
1122 | (args->index2 <= args->index)) { | |
1123 | args->index2++; | |
1124 | } | |
1125 | } | |
1126 | xfs_da_log_buf(args->trans, bp, | |
1127 | XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); | |
1128 | ASSERT((args->index == 0) || (INT_GET(entry->hashval, ARCH_CONVERT) | |
1129 | >= INT_GET((entry-1)->hashval, | |
1130 | ARCH_CONVERT))); | |
1131 | ASSERT((args->index == INT_GET(hdr->count, ARCH_CONVERT)-1) || | |
1132 | (INT_GET(entry->hashval, ARCH_CONVERT) | |
1133 | <= (INT_GET((entry+1)->hashval, ARCH_CONVERT)))); | |
1134 | ||
1135 | /* | |
1136 | * Copy the attribute name and value into the new space. | |
1137 | * | |
1138 | * For "remote" attribute values, simply note that we need to | |
1139 | * allocate space for the "remote" value. We can't actually | |
1140 | * allocate the extents in this transaction, and we can't decide | |
1141 | * which blocks they should be as we might allocate more blocks | |
1142 | * as part of this transaction (a split operation for example). | |
1143 | */ | |
1144 | if (entry->flags & XFS_ATTR_LOCAL) { | |
1145 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index); | |
1146 | name_loc->namelen = args->namelen; | |
1147 | INT_SET(name_loc->valuelen, ARCH_CONVERT, args->valuelen); | |
1148 | memcpy((char *)name_loc->nameval, args->name, args->namelen); | |
1149 | memcpy((char *)&name_loc->nameval[args->namelen], args->value, | |
1150 | INT_GET(name_loc->valuelen, ARCH_CONVERT)); | |
1151 | } else { | |
1152 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); | |
1153 | name_rmt->namelen = args->namelen; | |
1154 | memcpy((char *)name_rmt->name, args->name, args->namelen); | |
1155 | entry->flags |= XFS_ATTR_INCOMPLETE; | |
1156 | /* just in case */ | |
1157 | name_rmt->valuelen = 0; | |
1158 | name_rmt->valueblk = 0; | |
1159 | args->rmtblkno = 1; | |
1160 | args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen); | |
1161 | } | |
1162 | xfs_da_log_buf(args->trans, bp, | |
1163 | XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index), | |
1164 | xfs_attr_leaf_entsize(leaf, args->index))); | |
1165 | ||
1166 | /* | |
1167 | * Update the control info for this leaf node | |
1168 | */ | |
1169 | if (INT_GET(entry->nameidx, ARCH_CONVERT) | |
1170 | < INT_GET(hdr->firstused, ARCH_CONVERT)) { | |
1171 | /* both on-disk, don't endian-flip twice */ | |
1172 | hdr->firstused = entry->nameidx; | |
1173 | } | |
1174 | ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) | |
1175 | >= ((INT_GET(hdr->count, ARCH_CONVERT) | |
1176 | * sizeof(*entry))+sizeof(*hdr))); | |
1177 | tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1) | |
1178 | * sizeof(xfs_attr_leaf_entry_t) | |
1179 | + sizeof(xfs_attr_leaf_hdr_t); | |
1180 | map = &hdr->freemap[0]; | |
1181 | for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) { | |
1182 | if (INT_GET(map->base, ARCH_CONVERT) == tmp) { | |
1183 | INT_MOD(map->base, ARCH_CONVERT, | |
1184 | sizeof(xfs_attr_leaf_entry_t)); | |
1185 | INT_MOD(map->size, ARCH_CONVERT, | |
1186 | -sizeof(xfs_attr_leaf_entry_t)); | |
1187 | } | |
1188 | } | |
1189 | INT_MOD(hdr->usedbytes, ARCH_CONVERT, | |
1190 | xfs_attr_leaf_entsize(leaf, args->index)); | |
1191 | xfs_da_log_buf(args->trans, bp, | |
1192 | XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr))); | |
1193 | return(0); | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Garbage collect a leaf attribute list block by copying it to a new buffer. | |
1198 | */ | |
1199 | STATIC void | |
1200 | xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp) | |
1201 | { | |
1202 | xfs_attr_leafblock_t *leaf_s, *leaf_d; | |
1203 | xfs_attr_leaf_hdr_t *hdr_s, *hdr_d; | |
1204 | xfs_mount_t *mp; | |
1205 | char *tmpbuffer; | |
1206 | ||
1207 | mp = trans->t_mountp; | |
1208 | tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP); | |
1209 | ASSERT(tmpbuffer != NULL); | |
1210 | memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp)); | |
1211 | memset(bp->data, 0, XFS_LBSIZE(mp)); | |
1212 | ||
1213 | /* | |
1214 | * Copy basic information | |
1215 | */ | |
1216 | leaf_s = (xfs_attr_leafblock_t *)tmpbuffer; | |
1217 | leaf_d = bp->data; | |
1218 | hdr_s = &leaf_s->hdr; | |
1219 | hdr_d = &leaf_d->hdr; | |
1220 | hdr_d->info = hdr_s->info; /* struct copy */ | |
1221 | INT_SET(hdr_d->firstused, ARCH_CONVERT, XFS_LBSIZE(mp)); | |
1222 | /* handle truncation gracefully */ | |
1223 | if (!hdr_d->firstused) { | |
1224 | INT_SET(hdr_d->firstused, ARCH_CONVERT, | |
1225 | XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN); | |
1226 | } | |
1227 | hdr_d->usedbytes = 0; | |
1228 | hdr_d->count = 0; | |
1229 | hdr_d->holes = 0; | |
1230 | INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, | |
1231 | sizeof(xfs_attr_leaf_hdr_t)); | |
1232 | INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, | |
1233 | INT_GET(hdr_d->firstused, ARCH_CONVERT) | |
1234 | - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT)); | |
1235 | ||
1236 | /* | |
1237 | * Copy all entry's in the same (sorted) order, | |
1238 | * but allocate name/value pairs packed and in sequence. | |
1239 | */ | |
1240 | xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0, | |
1241 | (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp); | |
1242 | ||
1243 | xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1); | |
1244 | ||
1245 | kmem_free(tmpbuffer, XFS_LBSIZE(mp)); | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Redistribute the attribute list entries between two leaf nodes, | |
1250 | * taking into account the size of the new entry. | |
1251 | * | |
1252 | * NOTE: if new block is empty, then it will get the upper half of the | |
1253 | * old block. At present, all (one) callers pass in an empty second block. | |
1254 | * | |
1255 | * This code adjusts the args->index/blkno and args->index2/blkno2 fields | |
1256 | * to match what it is doing in splitting the attribute leaf block. Those | |
1257 | * values are used in "atomic rename" operations on attributes. Note that | |
1258 | * the "new" and "old" values can end up in different blocks. | |
1259 | */ | |
1260 | STATIC void | |
1261 | xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, | |
1262 | xfs_da_state_blk_t *blk2) | |
1263 | { | |
1264 | xfs_da_args_t *args; | |
1265 | xfs_da_state_blk_t *tmp_blk; | |
1266 | xfs_attr_leafblock_t *leaf1, *leaf2; | |
1267 | xfs_attr_leaf_hdr_t *hdr1, *hdr2; | |
1268 | int count, totallen, max, space, swap; | |
1269 | ||
1270 | /* | |
1271 | * Set up environment. | |
1272 | */ | |
1273 | ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC); | |
1274 | ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC); | |
1275 | leaf1 = blk1->bp->data; | |
1276 | leaf2 = blk2->bp->data; | |
1277 | ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) | |
1278 | == XFS_ATTR_LEAF_MAGIC); | |
1279 | ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) | |
1280 | == XFS_ATTR_LEAF_MAGIC); | |
1281 | args = state->args; | |
1282 | ||
1283 | /* | |
1284 | * Check ordering of blocks, reverse if it makes things simpler. | |
1285 | * | |
1286 | * NOTE: Given that all (current) callers pass in an empty | |
1287 | * second block, this code should never set "swap". | |
1288 | */ | |
1289 | swap = 0; | |
1290 | if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) { | |
1291 | tmp_blk = blk1; | |
1292 | blk1 = blk2; | |
1293 | blk2 = tmp_blk; | |
1294 | leaf1 = blk1->bp->data; | |
1295 | leaf2 = blk2->bp->data; | |
1296 | swap = 1; | |
1297 | } | |
1298 | hdr1 = &leaf1->hdr; | |
1299 | hdr2 = &leaf2->hdr; | |
1300 | ||
1301 | /* | |
1302 | * Examine entries until we reduce the absolute difference in | |
1303 | * byte usage between the two blocks to a minimum. Then get | |
1304 | * the direction to copy and the number of elements to move. | |
1305 | * | |
1306 | * "inleaf" is true if the new entry should be inserted into blk1. | |
1307 | * If "swap" is also true, then reverse the sense of "inleaf". | |
1308 | */ | |
1309 | state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2, | |
1310 | &count, &totallen); | |
1311 | if (swap) | |
1312 | state->inleaf = !state->inleaf; | |
1313 | ||
1314 | /* | |
1315 | * Move any entries required from leaf to leaf: | |
1316 | */ | |
1317 | if (count < INT_GET(hdr1->count, ARCH_CONVERT)) { | |
1318 | /* | |
1319 | * Figure the total bytes to be added to the destination leaf. | |
1320 | */ | |
1321 | /* number entries being moved */ | |
1322 | count = INT_GET(hdr1->count, ARCH_CONVERT) - count; | |
1323 | space = INT_GET(hdr1->usedbytes, ARCH_CONVERT) - totallen; | |
1324 | space += count * sizeof(xfs_attr_leaf_entry_t); | |
1325 | ||
1326 | /* | |
1327 | * leaf2 is the destination, compact it if it looks tight. | |
1328 | */ | |
1329 | max = INT_GET(hdr2->firstused, ARCH_CONVERT) | |
1330 | - sizeof(xfs_attr_leaf_hdr_t); | |
1331 | max -= INT_GET(hdr2->count, ARCH_CONVERT) | |
1332 | * sizeof(xfs_attr_leaf_entry_t); | |
1333 | if (space > max) { | |
1334 | xfs_attr_leaf_compact(args->trans, blk2->bp); | |
1335 | } | |
1336 | ||
1337 | /* | |
1338 | * Move high entries from leaf1 to low end of leaf2. | |
1339 | */ | |
1340 | xfs_attr_leaf_moveents(leaf1, | |
1341 | INT_GET(hdr1->count, ARCH_CONVERT)-count, | |
1342 | leaf2, 0, count, state->mp); | |
1343 | ||
1344 | xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1); | |
1345 | xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1); | |
1346 | } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) { | |
1347 | /* | |
1348 | * I assert that since all callers pass in an empty | |
1349 | * second buffer, this code should never execute. | |
1350 | */ | |
1351 | ||
1352 | /* | |
1353 | * Figure the total bytes to be added to the destination leaf. | |
1354 | */ | |
1355 | /* number entries being moved */ | |
1356 | count -= INT_GET(hdr1->count, ARCH_CONVERT); | |
1357 | space = totallen - INT_GET(hdr1->usedbytes, ARCH_CONVERT); | |
1358 | space += count * sizeof(xfs_attr_leaf_entry_t); | |
1359 | ||
1360 | /* | |
1361 | * leaf1 is the destination, compact it if it looks tight. | |
1362 | */ | |
1363 | max = INT_GET(hdr1->firstused, ARCH_CONVERT) | |
1364 | - sizeof(xfs_attr_leaf_hdr_t); | |
1365 | max -= INT_GET(hdr1->count, ARCH_CONVERT) | |
1366 | * sizeof(xfs_attr_leaf_entry_t); | |
1367 | if (space > max) { | |
1368 | xfs_attr_leaf_compact(args->trans, blk1->bp); | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * Move low entries from leaf2 to high end of leaf1. | |
1373 | */ | |
1374 | xfs_attr_leaf_moveents(leaf2, 0, leaf1, | |
1375 | (int)INT_GET(hdr1->count, ARCH_CONVERT), count, | |
1376 | state->mp); | |
1377 | ||
1378 | xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1); | |
1379 | xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1); | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * Copy out last hashval in each block for B-tree code. | |
1384 | */ | |
1385 | blk1->hashval = | |
1386 | INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count, | |
1387 | ARCH_CONVERT)-1].hashval, ARCH_CONVERT); | |
1388 | blk2->hashval = | |
1389 | INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count, | |
1390 | ARCH_CONVERT)-1].hashval, ARCH_CONVERT); | |
1391 | ||
1392 | /* | |
1393 | * Adjust the expected index for insertion. | |
1394 | * NOTE: this code depends on the (current) situation that the | |
1395 | * second block was originally empty. | |
1396 | * | |
1397 | * If the insertion point moved to the 2nd block, we must adjust | |
1398 | * the index. We must also track the entry just following the | |
1399 | * new entry for use in an "atomic rename" operation, that entry | |
1400 | * is always the "old" entry and the "new" entry is what we are | |
1401 | * inserting. The index/blkno fields refer to the "old" entry, | |
1402 | * while the index2/blkno2 fields refer to the "new" entry. | |
1403 | */ | |
1404 | if (blk1->index > INT_GET(leaf1->hdr.count, ARCH_CONVERT)) { | |
1405 | ASSERT(state->inleaf == 0); | |
1406 | blk2->index = blk1->index | |
1407 | - INT_GET(leaf1->hdr.count, ARCH_CONVERT); | |
1408 | args->index = args->index2 = blk2->index; | |
1409 | args->blkno = args->blkno2 = blk2->blkno; | |
1410 | } else if (blk1->index == INT_GET(leaf1->hdr.count, ARCH_CONVERT)) { | |
1411 | if (state->inleaf) { | |
1412 | args->index = blk1->index; | |
1413 | args->blkno = blk1->blkno; | |
1414 | args->index2 = 0; | |
1415 | args->blkno2 = blk2->blkno; | |
1416 | } else { | |
1417 | blk2->index = blk1->index | |
1418 | - INT_GET(leaf1->hdr.count, ARCH_CONVERT); | |
1419 | args->index = args->index2 = blk2->index; | |
1420 | args->blkno = args->blkno2 = blk2->blkno; | |
1421 | } | |
1422 | } else { | |
1423 | ASSERT(state->inleaf == 1); | |
1424 | args->index = args->index2 = blk1->index; | |
1425 | args->blkno = args->blkno2 = blk1->blkno; | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * Examine entries until we reduce the absolute difference in | |
1431 | * byte usage between the two blocks to a minimum. | |
1432 | * GROT: Is this really necessary? With other than a 512 byte blocksize, | |
1433 | * GROT: there will always be enough room in either block for a new entry. | |
1434 | * GROT: Do a double-split for this case? | |
1435 | */ | |
1436 | STATIC int | |
1437 | xfs_attr_leaf_figure_balance(xfs_da_state_t *state, | |
1438 | xfs_da_state_blk_t *blk1, | |
1439 | xfs_da_state_blk_t *blk2, | |
1440 | int *countarg, int *usedbytesarg) | |
1441 | { | |
1442 | xfs_attr_leafblock_t *leaf1, *leaf2; | |
1443 | xfs_attr_leaf_hdr_t *hdr1, *hdr2; | |
1444 | xfs_attr_leaf_entry_t *entry; | |
1445 | int count, max, index, totallen, half; | |
1446 | int lastdelta, foundit, tmp; | |
1447 | ||
1448 | /* | |
1449 | * Set up environment. | |
1450 | */ | |
1451 | leaf1 = blk1->bp->data; | |
1452 | leaf2 = blk2->bp->data; | |
1453 | hdr1 = &leaf1->hdr; | |
1454 | hdr2 = &leaf2->hdr; | |
1455 | foundit = 0; | |
1456 | totallen = 0; | |
1457 | ||
1458 | /* | |
1459 | * Examine entries until we reduce the absolute difference in | |
1460 | * byte usage between the two blocks to a minimum. | |
1461 | */ | |
1462 | max = INT_GET(hdr1->count, ARCH_CONVERT) | |
1463 | + INT_GET(hdr2->count, ARCH_CONVERT); | |
1464 | half = (max+1) * sizeof(*entry); | |
1465 | half += INT_GET(hdr1->usedbytes, ARCH_CONVERT) | |
1466 | + INT_GET(hdr2->usedbytes, ARCH_CONVERT) | |
aa82daa0 NS |
1467 | + xfs_attr_leaf_newentsize( |
1468 | state->args->namelen, | |
1469 | state->args->valuelen, | |
1470 | state->blocksize, NULL); | |
1da177e4 LT |
1471 | half /= 2; |
1472 | lastdelta = state->blocksize; | |
1473 | entry = &leaf1->entries[0]; | |
1474 | for (count = index = 0; count < max; entry++, index++, count++) { | |
1475 | ||
1476 | #define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A)) | |
1477 | /* | |
1478 | * The new entry is in the first block, account for it. | |
1479 | */ | |
1480 | if (count == blk1->index) { | |
1481 | tmp = totallen + sizeof(*entry) + | |
aa82daa0 NS |
1482 | xfs_attr_leaf_newentsize( |
1483 | state->args->namelen, | |
1484 | state->args->valuelen, | |
1485 | state->blocksize, NULL); | |
1da177e4 LT |
1486 | if (XFS_ATTR_ABS(half - tmp) > lastdelta) |
1487 | break; | |
1488 | lastdelta = XFS_ATTR_ABS(half - tmp); | |
1489 | totallen = tmp; | |
1490 | foundit = 1; | |
1491 | } | |
1492 | ||
1493 | /* | |
1494 | * Wrap around into the second block if necessary. | |
1495 | */ | |
1496 | if (count == INT_GET(hdr1->count, ARCH_CONVERT)) { | |
1497 | leaf1 = leaf2; | |
1498 | entry = &leaf1->entries[0]; | |
1499 | index = 0; | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * Figure out if next leaf entry would be too much. | |
1504 | */ | |
1505 | tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1, | |
1506 | index); | |
1507 | if (XFS_ATTR_ABS(half - tmp) > lastdelta) | |
1508 | break; | |
1509 | lastdelta = XFS_ATTR_ABS(half - tmp); | |
1510 | totallen = tmp; | |
1511 | #undef XFS_ATTR_ABS | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * Calculate the number of usedbytes that will end up in lower block. | |
1516 | * If new entry not in lower block, fix up the count. | |
1517 | */ | |
1518 | totallen -= count * sizeof(*entry); | |
1519 | if (foundit) { | |
1520 | totallen -= sizeof(*entry) + | |
aa82daa0 NS |
1521 | xfs_attr_leaf_newentsize( |
1522 | state->args->namelen, | |
1523 | state->args->valuelen, | |
1524 | state->blocksize, NULL); | |
1da177e4 LT |
1525 | } |
1526 | ||
1527 | *countarg = count; | |
1528 | *usedbytesarg = totallen; | |
1529 | return(foundit); | |
1530 | } | |
1531 | ||
1532 | /*======================================================================== | |
1533 | * Routines used for shrinking the Btree. | |
1534 | *========================================================================*/ | |
1535 | ||
1536 | /* | |
1537 | * Check a leaf block and its neighbors to see if the block should be | |
1538 | * collapsed into one or the other neighbor. Always keep the block | |
1539 | * with the smaller block number. | |
1540 | * If the current block is over 50% full, don't try to join it, return 0. | |
1541 | * If the block is empty, fill in the state structure and return 2. | |
1542 | * If it can be collapsed, fill in the state structure and return 1. | |
1543 | * If nothing can be done, return 0. | |
1544 | * | |
1545 | * GROT: allow for INCOMPLETE entries in calculation. | |
1546 | */ | |
1547 | int | |
1548 | xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action) | |
1549 | { | |
1550 | xfs_attr_leafblock_t *leaf; | |
1551 | xfs_da_state_blk_t *blk; | |
1552 | xfs_da_blkinfo_t *info; | |
1553 | int count, bytes, forward, error, retval, i; | |
1554 | xfs_dablk_t blkno; | |
1555 | xfs_dabuf_t *bp; | |
1556 | ||
1557 | /* | |
1558 | * Check for the degenerate case of the block being over 50% full. | |
1559 | * If so, it's not worth even looking to see if we might be able | |
1560 | * to coalesce with a sibling. | |
1561 | */ | |
1562 | blk = &state->path.blk[ state->path.active-1 ]; | |
1563 | info = blk->bp->data; | |
1564 | ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC); | |
1565 | leaf = (xfs_attr_leafblock_t *)info; | |
1566 | count = INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
1567 | bytes = sizeof(xfs_attr_leaf_hdr_t) + | |
1568 | count * sizeof(xfs_attr_leaf_entry_t) + | |
1569 | INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); | |
1570 | if (bytes > (state->blocksize >> 1)) { | |
1571 | *action = 0; /* blk over 50%, don't try to join */ | |
1572 | return(0); | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Check for the degenerate case of the block being empty. | |
1577 | * If the block is empty, we'll simply delete it, no need to | |
1578 | * coalesce it with a sibling block. We choose (aribtrarily) | |
1579 | * to merge with the forward block unless it is NULL. | |
1580 | */ | |
1581 | if (count == 0) { | |
1582 | /* | |
1583 | * Make altpath point to the block we want to keep and | |
1584 | * path point to the block we want to drop (this one). | |
1585 | */ | |
1586 | forward = info->forw; | |
1587 | memcpy(&state->altpath, &state->path, sizeof(state->path)); | |
1588 | error = xfs_da_path_shift(state, &state->altpath, forward, | |
1589 | 0, &retval); | |
1590 | if (error) | |
1591 | return(error); | |
1592 | if (retval) { | |
1593 | *action = 0; | |
1594 | } else { | |
1595 | *action = 2; | |
1596 | } | |
1597 | return(0); | |
1598 | } | |
1599 | ||
1600 | /* | |
1601 | * Examine each sibling block to see if we can coalesce with | |
1602 | * at least 25% free space to spare. We need to figure out | |
1603 | * whether to merge with the forward or the backward block. | |
1604 | * We prefer coalescing with the lower numbered sibling so as | |
1605 | * to shrink an attribute list over time. | |
1606 | */ | |
1607 | /* start with smaller blk num */ | |
1608 | forward = (INT_GET(info->forw, ARCH_CONVERT) | |
1609 | < INT_GET(info->back, ARCH_CONVERT)); | |
1610 | for (i = 0; i < 2; forward = !forward, i++) { | |
1611 | if (forward) | |
1612 | blkno = INT_GET(info->forw, ARCH_CONVERT); | |
1613 | else | |
1614 | blkno = INT_GET(info->back, ARCH_CONVERT); | |
1615 | if (blkno == 0) | |
1616 | continue; | |
1617 | error = xfs_da_read_buf(state->args->trans, state->args->dp, | |
1618 | blkno, -1, &bp, XFS_ATTR_FORK); | |
1619 | if (error) | |
1620 | return(error); | |
1621 | ASSERT(bp != NULL); | |
1622 | ||
1623 | leaf = (xfs_attr_leafblock_t *)info; | |
1624 | count = INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
1625 | bytes = state->blocksize - (state->blocksize>>2); | |
1626 | bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); | |
1627 | leaf = bp->data; | |
1628 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
1629 | == XFS_ATTR_LEAF_MAGIC); | |
1630 | count += INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
1631 | bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); | |
1632 | bytes -= count * sizeof(xfs_attr_leaf_entry_t); | |
1633 | bytes -= sizeof(xfs_attr_leaf_hdr_t); | |
1634 | xfs_da_brelse(state->args->trans, bp); | |
1635 | if (bytes >= 0) | |
1636 | break; /* fits with at least 25% to spare */ | |
1637 | } | |
1638 | if (i >= 2) { | |
1639 | *action = 0; | |
1640 | return(0); | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * Make altpath point to the block we want to keep (the lower | |
1645 | * numbered block) and path point to the block we want to drop. | |
1646 | */ | |
1647 | memcpy(&state->altpath, &state->path, sizeof(state->path)); | |
1648 | if (blkno < blk->blkno) { | |
1649 | error = xfs_da_path_shift(state, &state->altpath, forward, | |
1650 | 0, &retval); | |
1651 | } else { | |
1652 | error = xfs_da_path_shift(state, &state->path, forward, | |
1653 | 0, &retval); | |
1654 | } | |
1655 | if (error) | |
1656 | return(error); | |
1657 | if (retval) { | |
1658 | *action = 0; | |
1659 | } else { | |
1660 | *action = 1; | |
1661 | } | |
1662 | return(0); | |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * Remove a name from the leaf attribute list structure. | |
1667 | * | |
1668 | * Return 1 if leaf is less than 37% full, 0 if >= 37% full. | |
1669 | * If two leaves are 37% full, when combined they will leave 25% free. | |
1670 | */ | |
1671 | int | |
1672 | xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args) | |
1673 | { | |
1674 | xfs_attr_leafblock_t *leaf; | |
1675 | xfs_attr_leaf_hdr_t *hdr; | |
1676 | xfs_attr_leaf_map_t *map; | |
1677 | xfs_attr_leaf_entry_t *entry; | |
1678 | int before, after, smallest, entsize; | |
1679 | int tablesize, tmp, i; | |
1680 | xfs_mount_t *mp; | |
1681 | ||
1682 | leaf = bp->data; | |
1683 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
1684 | == XFS_ATTR_LEAF_MAGIC); | |
1685 | hdr = &leaf->hdr; | |
1686 | mp = args->trans->t_mountp; | |
1687 | ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0) | |
1688 | && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8))); | |
1689 | ASSERT((args->index >= 0) | |
1690 | && (args->index < INT_GET(hdr->count, ARCH_CONVERT))); | |
1691 | ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) | |
1692 | >= ((INT_GET(hdr->count, ARCH_CONVERT) | |
1693 | * sizeof(*entry))+sizeof(*hdr))); | |
1694 | entry = &leaf->entries[args->index]; | |
1695 | ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) | |
1696 | >= INT_GET(hdr->firstused, ARCH_CONVERT)); | |
1697 | ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp)); | |
1698 | ||
1699 | /* | |
1700 | * Scan through free region table: | |
1701 | * check for adjacency of free'd entry with an existing one, | |
1702 | * find smallest free region in case we need to replace it, | |
1703 | * adjust any map that borders the entry table, | |
1704 | */ | |
1705 | tablesize = INT_GET(hdr->count, ARCH_CONVERT) | |
1706 | * sizeof(xfs_attr_leaf_entry_t) | |
1707 | + sizeof(xfs_attr_leaf_hdr_t); | |
1708 | map = &hdr->freemap[0]; | |
1709 | tmp = INT_GET(map->size, ARCH_CONVERT); | |
1710 | before = after = -1; | |
1711 | smallest = XFS_ATTR_LEAF_MAPSIZE - 1; | |
1712 | entsize = xfs_attr_leaf_entsize(leaf, args->index); | |
1713 | for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) { | |
1714 | ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp)); | |
1715 | ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp)); | |
1716 | if (INT_GET(map->base, ARCH_CONVERT) == tablesize) { | |
1717 | INT_MOD(map->base, ARCH_CONVERT, | |
1718 | -sizeof(xfs_attr_leaf_entry_t)); | |
1719 | INT_MOD(map->size, ARCH_CONVERT, | |
1720 | sizeof(xfs_attr_leaf_entry_t)); | |
1721 | } | |
1722 | ||
1723 | if ((INT_GET(map->base, ARCH_CONVERT) | |
1724 | + INT_GET(map->size, ARCH_CONVERT)) | |
1725 | == INT_GET(entry->nameidx, ARCH_CONVERT)) { | |
1726 | before = i; | |
1727 | } else if (INT_GET(map->base, ARCH_CONVERT) | |
1728 | == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) { | |
1729 | after = i; | |
1730 | } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) { | |
1731 | tmp = INT_GET(map->size, ARCH_CONVERT); | |
1732 | smallest = i; | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | /* | |
1737 | * Coalesce adjacent freemap regions, | |
1738 | * or replace the smallest region. | |
1739 | */ | |
1740 | if ((before >= 0) || (after >= 0)) { | |
1741 | if ((before >= 0) && (after >= 0)) { | |
1742 | map = &hdr->freemap[before]; | |
1743 | INT_MOD(map->size, ARCH_CONVERT, entsize); | |
1744 | INT_MOD(map->size, ARCH_CONVERT, | |
1745 | INT_GET(hdr->freemap[after].size, | |
1746 | ARCH_CONVERT)); | |
1747 | hdr->freemap[after].base = 0; | |
1748 | hdr->freemap[after].size = 0; | |
1749 | } else if (before >= 0) { | |
1750 | map = &hdr->freemap[before]; | |
1751 | INT_MOD(map->size, ARCH_CONVERT, entsize); | |
1752 | } else { | |
1753 | map = &hdr->freemap[after]; | |
1754 | /* both on-disk, don't endian flip twice */ | |
1755 | map->base = entry->nameidx; | |
1756 | INT_MOD(map->size, ARCH_CONVERT, entsize); | |
1757 | } | |
1758 | } else { | |
1759 | /* | |
1760 | * Replace smallest region (if it is smaller than free'd entry) | |
1761 | */ | |
1762 | map = &hdr->freemap[smallest]; | |
1763 | if (INT_GET(map->size, ARCH_CONVERT) < entsize) { | |
1764 | INT_SET(map->base, ARCH_CONVERT, | |
1765 | INT_GET(entry->nameidx, ARCH_CONVERT)); | |
1766 | INT_SET(map->size, ARCH_CONVERT, entsize); | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Did we remove the first entry? | |
1772 | */ | |
1773 | if (INT_GET(entry->nameidx, ARCH_CONVERT) | |
1774 | == INT_GET(hdr->firstused, ARCH_CONVERT)) | |
1775 | smallest = 1; | |
1776 | else | |
1777 | smallest = 0; | |
1778 | ||
1779 | /* | |
1780 | * Compress the remaining entries and zero out the removed stuff. | |
1781 | */ | |
1782 | memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize); | |
1783 | INT_MOD(hdr->usedbytes, ARCH_CONVERT, -entsize); | |
1784 | xfs_da_log_buf(args->trans, bp, | |
1785 | XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index), | |
1786 | entsize)); | |
1787 | ||
1788 | tmp = (INT_GET(hdr->count, ARCH_CONVERT) - args->index) | |
1789 | * sizeof(xfs_attr_leaf_entry_t); | |
1790 | memmove((char *)entry, (char *)(entry+1), tmp); | |
1791 | INT_MOD(hdr->count, ARCH_CONVERT, -1); | |
1792 | xfs_da_log_buf(args->trans, bp, | |
1793 | XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry))); | |
1794 | entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)]; | |
1795 | memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t)); | |
1796 | ||
1797 | /* | |
1798 | * If we removed the first entry, re-find the first used byte | |
1799 | * in the name area. Note that if the entry was the "firstused", | |
1800 | * then we don't have a "hole" in our block resulting from | |
1801 | * removing the name. | |
1802 | */ | |
1803 | if (smallest) { | |
1804 | tmp = XFS_LBSIZE(mp); | |
1805 | entry = &leaf->entries[0]; | |
1806 | for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; | |
1807 | i >= 0; entry++, i--) { | |
1808 | ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) | |
1809 | >= INT_GET(hdr->firstused, ARCH_CONVERT)); | |
1810 | ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) | |
1811 | < XFS_LBSIZE(mp)); | |
1812 | if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp) | |
1813 | tmp = INT_GET(entry->nameidx, ARCH_CONVERT); | |
1814 | } | |
1815 | INT_SET(hdr->firstused, ARCH_CONVERT, tmp); | |
1816 | if (!hdr->firstused) { | |
1817 | INT_SET(hdr->firstused, ARCH_CONVERT, | |
1818 | tmp - XFS_ATTR_LEAF_NAME_ALIGN); | |
1819 | } | |
1820 | } else { | |
1821 | hdr->holes = 1; /* mark as needing compaction */ | |
1822 | } | |
1823 | xfs_da_log_buf(args->trans, bp, | |
1824 | XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr))); | |
1825 | ||
1826 | /* | |
1827 | * Check if leaf is less than 50% full, caller may want to | |
1828 | * "join" the leaf with a sibling if so. | |
1829 | */ | |
1830 | tmp = sizeof(xfs_attr_leaf_hdr_t); | |
1831 | tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) | |
1832 | * sizeof(xfs_attr_leaf_entry_t); | |
1833 | tmp += INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); | |
1834 | return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */ | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Move all the attribute list entries from drop_leaf into save_leaf. | |
1839 | */ | |
1840 | void | |
1841 | xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk, | |
1842 | xfs_da_state_blk_t *save_blk) | |
1843 | { | |
1844 | xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf; | |
1845 | xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr; | |
1846 | xfs_mount_t *mp; | |
1847 | char *tmpbuffer; | |
1848 | ||
1849 | /* | |
1850 | * Set up environment. | |
1851 | */ | |
1852 | mp = state->mp; | |
1853 | ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC); | |
1854 | ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC); | |
1855 | drop_leaf = drop_blk->bp->data; | |
1856 | save_leaf = save_blk->bp->data; | |
1857 | ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) | |
1858 | == XFS_ATTR_LEAF_MAGIC); | |
1859 | ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) | |
1860 | == XFS_ATTR_LEAF_MAGIC); | |
1861 | drop_hdr = &drop_leaf->hdr; | |
1862 | save_hdr = &save_leaf->hdr; | |
1863 | ||
1864 | /* | |
1865 | * Save last hashval from dying block for later Btree fixup. | |
1866 | */ | |
1867 | drop_blk->hashval = | |
1868 | INT_GET(drop_leaf->entries[INT_GET(drop_leaf->hdr.count, | |
1869 | ARCH_CONVERT)-1].hashval, | |
1870 | ARCH_CONVERT); | |
1871 | ||
1872 | /* | |
1873 | * Check if we need a temp buffer, or can we do it in place. | |
1874 | * Note that we don't check "leaf" for holes because we will | |
1875 | * always be dropping it, toosmall() decided that for us already. | |
1876 | */ | |
1877 | if (save_hdr->holes == 0) { | |
1878 | /* | |
1879 | * dest leaf has no holes, so we add there. May need | |
1880 | * to make some room in the entry array. | |
1881 | */ | |
1882 | if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) { | |
1883 | xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0, | |
1884 | (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp); | |
1885 | } else { | |
1886 | xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, | |
1887 | INT_GET(save_hdr->count, ARCH_CONVERT), | |
1888 | (int)INT_GET(drop_hdr->count, ARCH_CONVERT), | |
1889 | mp); | |
1890 | } | |
1891 | } else { | |
1892 | /* | |
1893 | * Destination has holes, so we make a temporary copy | |
1894 | * of the leaf and add them both to that. | |
1895 | */ | |
1896 | tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP); | |
1897 | ASSERT(tmpbuffer != NULL); | |
1898 | memset(tmpbuffer, 0, state->blocksize); | |
1899 | tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer; | |
1900 | tmp_hdr = &tmp_leaf->hdr; | |
1901 | tmp_hdr->info = save_hdr->info; /* struct copy */ | |
1902 | tmp_hdr->count = 0; | |
1903 | INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize); | |
1904 | if (!tmp_hdr->firstused) { | |
1905 | INT_SET(tmp_hdr->firstused, ARCH_CONVERT, | |
1906 | state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN); | |
1907 | } | |
1908 | tmp_hdr->usedbytes = 0; | |
1909 | if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) { | |
1910 | xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0, | |
1911 | (int)INT_GET(drop_hdr->count, ARCH_CONVERT), | |
1912 | mp); | |
1913 | xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, | |
1914 | INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT), | |
1915 | (int)INT_GET(save_hdr->count, ARCH_CONVERT), | |
1916 | mp); | |
1917 | } else { | |
1918 | xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0, | |
1919 | (int)INT_GET(save_hdr->count, ARCH_CONVERT), | |
1920 | mp); | |
1921 | xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, | |
1922 | INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT), | |
1923 | (int)INT_GET(drop_hdr->count, ARCH_CONVERT), | |
1924 | mp); | |
1925 | } | |
1926 | memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize); | |
1927 | kmem_free(tmpbuffer, state->blocksize); | |
1928 | } | |
1929 | ||
1930 | xfs_da_log_buf(state->args->trans, save_blk->bp, 0, | |
1931 | state->blocksize - 1); | |
1932 | ||
1933 | /* | |
1934 | * Copy out last hashval in each block for B-tree code. | |
1935 | */ | |
1936 | save_blk->hashval = | |
1937 | INT_GET(save_leaf->entries[INT_GET(save_leaf->hdr.count, | |
1938 | ARCH_CONVERT)-1].hashval, | |
1939 | ARCH_CONVERT); | |
1940 | } | |
1941 | ||
1942 | /*======================================================================== | |
1943 | * Routines used for finding things in the Btree. | |
1944 | *========================================================================*/ | |
1945 | ||
1946 | /* | |
1947 | * Look up a name in a leaf attribute list structure. | |
1948 | * This is the internal routine, it uses the caller's buffer. | |
1949 | * | |
1950 | * Note that duplicate keys are allowed, but only check within the | |
1951 | * current leaf node. The Btree code must check in adjacent leaf nodes. | |
1952 | * | |
1953 | * Return in args->index the index into the entry[] array of either | |
1954 | * the found entry, or where the entry should have been (insert before | |
1955 | * that entry). | |
1956 | * | |
1957 | * Don't change the args->value unless we find the attribute. | |
1958 | */ | |
1959 | int | |
1960 | xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args) | |
1961 | { | |
1962 | xfs_attr_leafblock_t *leaf; | |
1963 | xfs_attr_leaf_entry_t *entry; | |
1964 | xfs_attr_leaf_name_local_t *name_loc; | |
1965 | xfs_attr_leaf_name_remote_t *name_rmt; | |
1966 | int probe, span; | |
1967 | xfs_dahash_t hashval; | |
1968 | ||
1969 | leaf = bp->data; | |
1970 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
1971 | == XFS_ATTR_LEAF_MAGIC); | |
1972 | ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) | |
1973 | < (XFS_LBSIZE(args->dp->i_mount)/8)); | |
1974 | ||
1975 | /* | |
1976 | * Binary search. (note: small blocks will skip this loop) | |
1977 | */ | |
1978 | hashval = args->hashval; | |
1979 | probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2; | |
1980 | for (entry = &leaf->entries[probe]; span > 4; | |
1981 | entry = &leaf->entries[probe]) { | |
1982 | span /= 2; | |
1983 | if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval) | |
1984 | probe += span; | |
1985 | else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval) | |
1986 | probe -= span; | |
1987 | else | |
1988 | break; | |
1989 | } | |
1990 | ASSERT((probe >= 0) && | |
1991 | (!leaf->hdr.count | |
1992 | || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)))); | |
1993 | ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT) | |
1994 | == hashval)); | |
1995 | ||
1996 | /* | |
1997 | * Since we may have duplicate hashval's, find the first matching | |
1998 | * hashval in the leaf. | |
1999 | */ | |
2000 | while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT) | |
2001 | >= hashval)) { | |
2002 | entry--; | |
2003 | probe--; | |
2004 | } | |
2005 | while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) | |
2006 | && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) { | |
2007 | entry++; | |
2008 | probe++; | |
2009 | } | |
2010 | if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT)) | |
2011 | || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) { | |
2012 | args->index = probe; | |
2013 | return(XFS_ERROR(ENOATTR)); | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * Duplicate keys may be present, so search all of them for a match. | |
2018 | */ | |
2019 | for ( ; (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) | |
2020 | && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval); | |
2021 | entry++, probe++) { | |
2022 | /* | |
2023 | * GROT: Add code to remove incomplete entries. | |
2024 | */ | |
2025 | /* | |
2026 | * If we are looking for INCOMPLETE entries, show only those. | |
2027 | * If we are looking for complete entries, show only those. | |
2028 | */ | |
2029 | if ((args->flags & XFS_ATTR_INCOMPLETE) != | |
2030 | (entry->flags & XFS_ATTR_INCOMPLETE)) { | |
2031 | continue; | |
2032 | } | |
2033 | if (entry->flags & XFS_ATTR_LOCAL) { | |
2034 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe); | |
2035 | if (name_loc->namelen != args->namelen) | |
2036 | continue; | |
2037 | if (memcmp(args->name, (char *)name_loc->nameval, | |
2038 | args->namelen) != 0) | |
2039 | continue; | |
2040 | if (((args->flags & ATTR_SECURE) != 0) != | |
2041 | ((entry->flags & XFS_ATTR_SECURE) != 0)) | |
2042 | continue; | |
2043 | if (((args->flags & ATTR_ROOT) != 0) != | |
2044 | ((entry->flags & XFS_ATTR_ROOT) != 0)) | |
2045 | continue; | |
2046 | args->index = probe; | |
2047 | return(XFS_ERROR(EEXIST)); | |
2048 | } else { | |
2049 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe); | |
2050 | if (name_rmt->namelen != args->namelen) | |
2051 | continue; | |
2052 | if (memcmp(args->name, (char *)name_rmt->name, | |
2053 | args->namelen) != 0) | |
2054 | continue; | |
2055 | if (((args->flags & ATTR_SECURE) != 0) != | |
2056 | ((entry->flags & XFS_ATTR_SECURE) != 0)) | |
2057 | continue; | |
2058 | if (((args->flags & ATTR_ROOT) != 0) != | |
2059 | ((entry->flags & XFS_ATTR_ROOT) != 0)) | |
2060 | continue; | |
2061 | args->index = probe; | |
2062 | args->rmtblkno | |
2063 | = INT_GET(name_rmt->valueblk, ARCH_CONVERT); | |
2064 | args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, | |
2065 | INT_GET(name_rmt->valuelen, | |
2066 | ARCH_CONVERT)); | |
2067 | return(XFS_ERROR(EEXIST)); | |
2068 | } | |
2069 | } | |
2070 | args->index = probe; | |
2071 | return(XFS_ERROR(ENOATTR)); | |
2072 | } | |
2073 | ||
2074 | /* | |
2075 | * Get the value associated with an attribute name from a leaf attribute | |
2076 | * list structure. | |
2077 | */ | |
2078 | int | |
2079 | xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args) | |
2080 | { | |
2081 | int valuelen; | |
2082 | xfs_attr_leafblock_t *leaf; | |
2083 | xfs_attr_leaf_entry_t *entry; | |
2084 | xfs_attr_leaf_name_local_t *name_loc; | |
2085 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2086 | ||
2087 | leaf = bp->data; | |
2088 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
2089 | == XFS_ATTR_LEAF_MAGIC); | |
2090 | ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) | |
2091 | < (XFS_LBSIZE(args->dp->i_mount)/8)); | |
2092 | ASSERT(args->index < ((int)INT_GET(leaf->hdr.count, ARCH_CONVERT))); | |
2093 | ||
2094 | entry = &leaf->entries[args->index]; | |
2095 | if (entry->flags & XFS_ATTR_LOCAL) { | |
2096 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index); | |
2097 | ASSERT(name_loc->namelen == args->namelen); | |
2098 | ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0); | |
2099 | valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT); | |
2100 | if (args->flags & ATTR_KERNOVAL) { | |
2101 | args->valuelen = valuelen; | |
2102 | return(0); | |
2103 | } | |
2104 | if (args->valuelen < valuelen) { | |
2105 | args->valuelen = valuelen; | |
2106 | return(XFS_ERROR(ERANGE)); | |
2107 | } | |
2108 | args->valuelen = valuelen; | |
2109 | memcpy(args->value, &name_loc->nameval[args->namelen], valuelen); | |
2110 | } else { | |
2111 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); | |
2112 | ASSERT(name_rmt->namelen == args->namelen); | |
2113 | ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0); | |
2114 | valuelen = INT_GET(name_rmt->valuelen, ARCH_CONVERT); | |
2115 | args->rmtblkno = INT_GET(name_rmt->valueblk, ARCH_CONVERT); | |
2116 | args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen); | |
2117 | if (args->flags & ATTR_KERNOVAL) { | |
2118 | args->valuelen = valuelen; | |
2119 | return(0); | |
2120 | } | |
2121 | if (args->valuelen < valuelen) { | |
2122 | args->valuelen = valuelen; | |
2123 | return(XFS_ERROR(ERANGE)); | |
2124 | } | |
2125 | args->valuelen = valuelen; | |
2126 | } | |
2127 | return(0); | |
2128 | } | |
2129 | ||
2130 | /*======================================================================== | |
2131 | * Utility routines. | |
2132 | *========================================================================*/ | |
2133 | ||
2134 | /* | |
2135 | * Move the indicated entries from one leaf to another. | |
2136 | * NOTE: this routine modifies both source and destination leaves. | |
2137 | */ | |
2138 | /*ARGSUSED*/ | |
2139 | STATIC void | |
2140 | xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s, | |
2141 | xfs_attr_leafblock_t *leaf_d, int start_d, | |
2142 | int count, xfs_mount_t *mp) | |
2143 | { | |
2144 | xfs_attr_leaf_hdr_t *hdr_s, *hdr_d; | |
2145 | xfs_attr_leaf_entry_t *entry_s, *entry_d; | |
2146 | int desti, tmp, i; | |
2147 | ||
2148 | /* | |
2149 | * Check for nothing to do. | |
2150 | */ | |
2151 | if (count == 0) | |
2152 | return; | |
2153 | ||
2154 | /* | |
2155 | * Set up environment. | |
2156 | */ | |
2157 | ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT) | |
2158 | == XFS_ATTR_LEAF_MAGIC); | |
2159 | ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT) | |
2160 | == XFS_ATTR_LEAF_MAGIC); | |
2161 | hdr_s = &leaf_s->hdr; | |
2162 | hdr_d = &leaf_d->hdr; | |
2163 | ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0) | |
2164 | && (INT_GET(hdr_s->count, ARCH_CONVERT) | |
2165 | < (XFS_LBSIZE(mp)/8))); | |
2166 | ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >= | |
2167 | ((INT_GET(hdr_s->count, ARCH_CONVERT) | |
2168 | * sizeof(*entry_s))+sizeof(*hdr_s))); | |
2169 | ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)); | |
2170 | ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= | |
2171 | ((INT_GET(hdr_d->count, ARCH_CONVERT) | |
2172 | * sizeof(*entry_d))+sizeof(*hdr_d))); | |
2173 | ||
2174 | ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT)); | |
2175 | ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT)); | |
2176 | ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT)); | |
2177 | ||
2178 | /* | |
2179 | * Move the entries in the destination leaf up to make a hole? | |
2180 | */ | |
2181 | if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) { | |
2182 | tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d; | |
2183 | tmp *= sizeof(xfs_attr_leaf_entry_t); | |
2184 | entry_s = &leaf_d->entries[start_d]; | |
2185 | entry_d = &leaf_d->entries[start_d + count]; | |
2186 | memmove((char *)entry_d, (char *)entry_s, tmp); | |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * Copy all entry's in the same (sorted) order, | |
2191 | * but allocate attribute info packed and in sequence. | |
2192 | */ | |
2193 | entry_s = &leaf_s->entries[start_s]; | |
2194 | entry_d = &leaf_d->entries[start_d]; | |
2195 | desti = start_d; | |
2196 | for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) { | |
2197 | ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) | |
2198 | >= INT_GET(hdr_s->firstused, ARCH_CONVERT)); | |
2199 | tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i); | |
2200 | #ifdef GROT | |
2201 | /* | |
2202 | * Code to drop INCOMPLETE entries. Difficult to use as we | |
2203 | * may also need to change the insertion index. Code turned | |
2204 | * off for 6.2, should be revisited later. | |
2205 | */ | |
2206 | if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */ | |
2207 | memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp); | |
2208 | INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp); | |
2209 | INT_MOD(hdr_s->count, ARCH_CONVERT, -1); | |
2210 | entry_d--; /* to compensate for ++ in loop hdr */ | |
2211 | desti--; | |
2212 | if ((start_s + i) < offset) | |
2213 | result++; /* insertion index adjustment */ | |
2214 | } else { | |
2215 | #endif /* GROT */ | |
2216 | INT_MOD(hdr_d->firstused, ARCH_CONVERT, -tmp); | |
2217 | /* both on-disk, don't endian flip twice */ | |
2218 | entry_d->hashval = entry_s->hashval; | |
2219 | /* both on-disk, don't endian flip twice */ | |
2220 | entry_d->nameidx = hdr_d->firstused; | |
2221 | entry_d->flags = entry_s->flags; | |
2222 | ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp | |
2223 | <= XFS_LBSIZE(mp)); | |
2224 | memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti), | |
2225 | XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp); | |
2226 | ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp | |
2227 | <= XFS_LBSIZE(mp)); | |
2228 | memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp); | |
2229 | INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp); | |
2230 | INT_MOD(hdr_d->usedbytes, ARCH_CONVERT, tmp); | |
2231 | INT_MOD(hdr_s->count, ARCH_CONVERT, -1); | |
2232 | INT_MOD(hdr_d->count, ARCH_CONVERT, 1); | |
2233 | tmp = INT_GET(hdr_d->count, ARCH_CONVERT) | |
2234 | * sizeof(xfs_attr_leaf_entry_t) | |
2235 | + sizeof(xfs_attr_leaf_hdr_t); | |
2236 | ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp); | |
2237 | #ifdef GROT | |
2238 | } | |
2239 | #endif /* GROT */ | |
2240 | } | |
2241 | ||
2242 | /* | |
2243 | * Zero out the entries we just copied. | |
2244 | */ | |
2245 | if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) { | |
2246 | tmp = count * sizeof(xfs_attr_leaf_entry_t); | |
2247 | entry_s = &leaf_s->entries[start_s]; | |
2248 | ASSERT(((char *)entry_s + tmp) <= | |
2249 | ((char *)leaf_s + XFS_LBSIZE(mp))); | |
2250 | memset((char *)entry_s, 0, tmp); | |
2251 | } else { | |
2252 | /* | |
2253 | * Move the remaining entries down to fill the hole, | |
2254 | * then zero the entries at the top. | |
2255 | */ | |
2256 | tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count; | |
2257 | tmp *= sizeof(xfs_attr_leaf_entry_t); | |
2258 | entry_s = &leaf_s->entries[start_s + count]; | |
2259 | entry_d = &leaf_s->entries[start_s]; | |
2260 | memmove((char *)entry_d, (char *)entry_s, tmp); | |
2261 | ||
2262 | tmp = count * sizeof(xfs_attr_leaf_entry_t); | |
2263 | entry_s = &leaf_s->entries[INT_GET(hdr_s->count, | |
2264 | ARCH_CONVERT)]; | |
2265 | ASSERT(((char *)entry_s + tmp) <= | |
2266 | ((char *)leaf_s + XFS_LBSIZE(mp))); | |
2267 | memset((char *)entry_s, 0, tmp); | |
2268 | } | |
2269 | ||
2270 | /* | |
2271 | * Fill in the freemap information | |
2272 | */ | |
2273 | INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, | |
2274 | sizeof(xfs_attr_leaf_hdr_t)); | |
2275 | INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT, | |
2276 | INT_GET(hdr_d->count, ARCH_CONVERT) | |
2277 | * sizeof(xfs_attr_leaf_entry_t)); | |
2278 | INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, | |
2279 | INT_GET(hdr_d->firstused, ARCH_CONVERT) | |
2280 | - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT)); | |
2281 | hdr_d->freemap[1].base = 0; | |
2282 | hdr_d->freemap[2].base = 0; | |
2283 | hdr_d->freemap[1].size = 0; | |
2284 | hdr_d->freemap[2].size = 0; | |
2285 | hdr_s->holes = 1; /* leaf may not be compact */ | |
2286 | } | |
2287 | ||
2288 | /* | |
2289 | * Compare two leaf blocks "order". | |
2290 | * Return 0 unless leaf2 should go before leaf1. | |
2291 | */ | |
2292 | int | |
2293 | xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp) | |
2294 | { | |
2295 | xfs_attr_leafblock_t *leaf1, *leaf2; | |
2296 | ||
2297 | leaf1 = leaf1_bp->data; | |
2298 | leaf2 = leaf2_bp->data; | |
2299 | ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) | |
2300 | == XFS_ATTR_LEAF_MAGIC) && | |
2301 | (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) | |
2302 | == XFS_ATTR_LEAF_MAGIC)); | |
2303 | if ( (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0) | |
2304 | && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0) | |
2305 | && ( (INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) < | |
2306 | INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT)) | |
2307 | || (INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count, | |
2308 | ARCH_CONVERT)-1].hashval, ARCH_CONVERT) < | |
2309 | INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count, | |
2310 | ARCH_CONVERT)-1].hashval, ARCH_CONVERT))) ) { | |
2311 | return(1); | |
2312 | } | |
2313 | return(0); | |
2314 | } | |
2315 | ||
2316 | /* | |
2317 | * Pick up the last hashvalue from a leaf block. | |
2318 | */ | |
2319 | xfs_dahash_t | |
2320 | xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count) | |
2321 | { | |
2322 | xfs_attr_leafblock_t *leaf; | |
2323 | ||
2324 | leaf = bp->data; | |
2325 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
2326 | == XFS_ATTR_LEAF_MAGIC); | |
2327 | if (count) | |
2328 | *count = INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
2329 | if (!leaf->hdr.count) | |
2330 | return(0); | |
2331 | return(INT_GET(leaf->entries[INT_GET(leaf->hdr.count, | |
2332 | ARCH_CONVERT)-1].hashval, ARCH_CONVERT)); | |
2333 | } | |
2334 | ||
2335 | /* | |
2336 | * Calculate the number of bytes used to store the indicated attribute | |
2337 | * (whether local or remote only calculate bytes in this block). | |
2338 | */ | |
ba0f32d4 | 2339 | STATIC int |
1da177e4 LT |
2340 | xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index) |
2341 | { | |
2342 | xfs_attr_leaf_name_local_t *name_loc; | |
2343 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2344 | int size; | |
2345 | ||
2346 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
2347 | == XFS_ATTR_LEAF_MAGIC); | |
2348 | if (leaf->entries[index].flags & XFS_ATTR_LOCAL) { | |
2349 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index); | |
2350 | size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen, | |
2351 | INT_GET(name_loc->valuelen, | |
2352 | ARCH_CONVERT)); | |
2353 | } else { | |
2354 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index); | |
2355 | size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen); | |
2356 | } | |
2357 | return(size); | |
2358 | } | |
2359 | ||
2360 | /* | |
2361 | * Calculate the number of bytes that would be required to store the new | |
2362 | * attribute (whether local or remote only calculate bytes in this block). | |
2363 | * This routine decides as a side effect whether the attribute will be | |
2364 | * a "local" or a "remote" attribute. | |
2365 | */ | |
2366 | int | |
aa82daa0 | 2367 | xfs_attr_leaf_newentsize(int namelen, int valuelen, int blocksize, int *local) |
1da177e4 LT |
2368 | { |
2369 | int size; | |
2370 | ||
aa82daa0 | 2371 | size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(namelen, valuelen); |
1da177e4 LT |
2372 | if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) { |
2373 | if (local) { | |
2374 | *local = 1; | |
2375 | } | |
2376 | } else { | |
aa82daa0 | 2377 | size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(namelen); |
1da177e4 LT |
2378 | if (local) { |
2379 | *local = 0; | |
2380 | } | |
2381 | } | |
2382 | return(size); | |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * Copy out attribute list entries for attr_list(), for leaf attribute lists. | |
2387 | */ | |
2388 | int | |
2389 | xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context) | |
2390 | { | |
2391 | attrlist_cursor_kern_t *cursor; | |
2392 | xfs_attr_leafblock_t *leaf; | |
2393 | xfs_attr_leaf_entry_t *entry; | |
2394 | xfs_attr_leaf_name_local_t *name_loc; | |
2395 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2396 | int retval, i; | |
2397 | ||
2398 | ASSERT(bp != NULL); | |
2399 | leaf = bp->data; | |
2400 | cursor = context->cursor; | |
2401 | cursor->initted = 1; | |
2402 | ||
2403 | xfs_attr_trace_l_cl("blk start", context, leaf); | |
2404 | ||
2405 | /* | |
2406 | * Re-find our place in the leaf block if this is a new syscall. | |
2407 | */ | |
2408 | if (context->resynch) { | |
2409 | entry = &leaf->entries[0]; | |
2410 | for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); | |
2411 | entry++, i++) { | |
2412 | if (INT_GET(entry->hashval, ARCH_CONVERT) | |
2413 | == cursor->hashval) { | |
2414 | if (cursor->offset == context->dupcnt) { | |
2415 | context->dupcnt = 0; | |
2416 | break; | |
2417 | } | |
2418 | context->dupcnt++; | |
2419 | } else if (INT_GET(entry->hashval, ARCH_CONVERT) | |
2420 | > cursor->hashval) { | |
2421 | context->dupcnt = 0; | |
2422 | break; | |
2423 | } | |
2424 | } | |
2425 | if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) { | |
2426 | xfs_attr_trace_l_c("not found", context); | |
2427 | return(0); | |
2428 | } | |
2429 | } else { | |
2430 | entry = &leaf->entries[0]; | |
2431 | i = 0; | |
2432 | } | |
2433 | context->resynch = 0; | |
2434 | ||
2435 | /* | |
2436 | * We have found our place, start copying out the new attributes. | |
2437 | */ | |
2438 | retval = 0; | |
2439 | for ( ; (i < INT_GET(leaf->hdr.count, ARCH_CONVERT)) | |
2440 | && (retval == 0); entry++, i++) { | |
2441 | attrnames_t *namesp; | |
2442 | ||
2443 | if (INT_GET(entry->hashval, ARCH_CONVERT) != cursor->hashval) { | |
2444 | cursor->hashval = INT_GET(entry->hashval, ARCH_CONVERT); | |
2445 | cursor->offset = 0; | |
2446 | } | |
2447 | ||
2448 | if (entry->flags & XFS_ATTR_INCOMPLETE) | |
2449 | continue; /* skip incomplete entries */ | |
2450 | if (((context->flags & ATTR_SECURE) != 0) != | |
2451 | ((entry->flags & XFS_ATTR_SECURE) != 0) && | |
2452 | !(context->flags & ATTR_KERNORMALS)) | |
2453 | continue; /* skip non-matching entries */ | |
2454 | if (((context->flags & ATTR_ROOT) != 0) != | |
2455 | ((entry->flags & XFS_ATTR_ROOT) != 0) && | |
2456 | !(context->flags & ATTR_KERNROOTLS)) | |
2457 | continue; /* skip non-matching entries */ | |
2458 | ||
2459 | namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure : | |
2460 | ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted : | |
2461 | &attr_user); | |
2462 | ||
2463 | if (entry->flags & XFS_ATTR_LOCAL) { | |
2464 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); | |
2465 | if (context->flags & ATTR_KERNOVAL) { | |
2466 | ASSERT(context->flags & ATTR_KERNAMELS); | |
2467 | context->count += namesp->attr_namelen + | |
2468 | (int)name_loc->namelen + 1; | |
2469 | } else { | |
2470 | retval = xfs_attr_put_listent(context, namesp, | |
2471 | (char *)name_loc->nameval, | |
2472 | (int)name_loc->namelen, | |
2473 | (int)INT_GET(name_loc->valuelen, | |
2474 | ARCH_CONVERT)); | |
2475 | } | |
2476 | } else { | |
2477 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); | |
2478 | if (context->flags & ATTR_KERNOVAL) { | |
2479 | ASSERT(context->flags & ATTR_KERNAMELS); | |
2480 | context->count += namesp->attr_namelen + | |
2481 | (int)name_rmt->namelen + 1; | |
2482 | } else { | |
2483 | retval = xfs_attr_put_listent(context, namesp, | |
2484 | (char *)name_rmt->name, | |
2485 | (int)name_rmt->namelen, | |
2486 | (int)INT_GET(name_rmt->valuelen, | |
2487 | ARCH_CONVERT)); | |
2488 | } | |
2489 | } | |
2490 | if (retval == 0) { | |
2491 | cursor->offset++; | |
2492 | } | |
2493 | } | |
2494 | xfs_attr_trace_l_cl("blk end", context, leaf); | |
2495 | return(retval); | |
2496 | } | |
2497 | ||
2498 | #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \ | |
2499 | (((struct attrlist_ent *) 0)->a_name - (char *) 0) | |
2500 | #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \ | |
2501 | ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \ | |
2502 | & ~(sizeof(u_int32_t)-1)) | |
2503 | ||
2504 | /* | |
2505 | * Format an attribute and copy it out to the user's buffer. | |
2506 | * Take care to check values and protect against them changing later, | |
2507 | * we may be reading them directly out of a user buffer. | |
2508 | */ | |
2509 | /*ARGSUSED*/ | |
ba0f32d4 | 2510 | STATIC int |
1da177e4 LT |
2511 | xfs_attr_put_listent(xfs_attr_list_context_t *context, |
2512 | attrnames_t *namesp, char *name, int namelen, int valuelen) | |
2513 | { | |
2514 | attrlist_ent_t *aep; | |
2515 | int arraytop; | |
2516 | ||
2517 | ASSERT(!(context->flags & ATTR_KERNOVAL)); | |
2518 | if (context->flags & ATTR_KERNAMELS) { | |
2519 | char *offset; | |
2520 | ||
2521 | ASSERT(context->count >= 0); | |
2522 | ||
2523 | arraytop = context->count + namesp->attr_namelen + namelen + 1; | |
2524 | if (arraytop > context->firstu) { | |
2525 | context->count = -1; /* insufficient space */ | |
2526 | return(1); | |
2527 | } | |
2528 | offset = (char *)context->alist + context->count; | |
2529 | strncpy(offset, namesp->attr_name, namesp->attr_namelen); | |
2530 | offset += namesp->attr_namelen; | |
2531 | strncpy(offset, name, namelen); /* real name */ | |
2532 | offset += namelen; | |
2533 | *offset = '\0'; | |
2534 | context->count += namesp->attr_namelen + namelen + 1; | |
2535 | return(0); | |
2536 | } | |
2537 | ||
2538 | ASSERT(context->count >= 0); | |
2539 | ASSERT(context->count < (ATTR_MAX_VALUELEN/8)); | |
2540 | ASSERT(context->firstu >= sizeof(*context->alist)); | |
2541 | ASSERT(context->firstu <= context->bufsize); | |
2542 | ||
2543 | arraytop = sizeof(*context->alist) + | |
2544 | context->count * sizeof(context->alist->al_offset[0]); | |
2545 | context->firstu -= ATTR_ENTSIZE(namelen); | |
2546 | if (context->firstu < arraytop) { | |
2547 | xfs_attr_trace_l_c("buffer full", context); | |
2548 | context->alist->al_more = 1; | |
2549 | return(1); | |
2550 | } | |
2551 | ||
2552 | aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]); | |
2553 | aep->a_valuelen = valuelen; | |
2554 | memcpy(aep->a_name, name, namelen); | |
2555 | aep->a_name[ namelen ] = 0; | |
2556 | context->alist->al_offset[ context->count++ ] = context->firstu; | |
2557 | context->alist->al_count = context->count; | |
2558 | xfs_attr_trace_l_c("add", context); | |
2559 | return(0); | |
2560 | } | |
2561 | ||
2562 | /*======================================================================== | |
2563 | * Manage the INCOMPLETE flag in a leaf entry | |
2564 | *========================================================================*/ | |
2565 | ||
2566 | /* | |
2567 | * Clear the INCOMPLETE flag on an entry in a leaf block. | |
2568 | */ | |
2569 | int | |
2570 | xfs_attr_leaf_clearflag(xfs_da_args_t *args) | |
2571 | { | |
2572 | xfs_attr_leafblock_t *leaf; | |
2573 | xfs_attr_leaf_entry_t *entry; | |
2574 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2575 | xfs_dabuf_t *bp; | |
2576 | int error; | |
2577 | #ifdef DEBUG | |
2578 | xfs_attr_leaf_name_local_t *name_loc; | |
2579 | int namelen; | |
2580 | char *name; | |
2581 | #endif /* DEBUG */ | |
2582 | ||
2583 | /* | |
2584 | * Set up the operation. | |
2585 | */ | |
2586 | error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, | |
2587 | XFS_ATTR_FORK); | |
2588 | if (error) { | |
2589 | return(error); | |
2590 | } | |
2591 | ASSERT(bp != NULL); | |
2592 | ||
2593 | leaf = bp->data; | |
2594 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
2595 | == XFS_ATTR_LEAF_MAGIC); | |
2596 | ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT)); | |
2597 | ASSERT(args->index >= 0); | |
2598 | entry = &leaf->entries[ args->index ]; | |
2599 | ASSERT(entry->flags & XFS_ATTR_INCOMPLETE); | |
2600 | ||
2601 | #ifdef DEBUG | |
2602 | if (entry->flags & XFS_ATTR_LOCAL) { | |
2603 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index); | |
2604 | namelen = name_loc->namelen; | |
2605 | name = (char *)name_loc->nameval; | |
2606 | } else { | |
2607 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); | |
2608 | namelen = name_rmt->namelen; | |
2609 | name = (char *)name_rmt->name; | |
2610 | } | |
2611 | ASSERT(INT_GET(entry->hashval, ARCH_CONVERT) == args->hashval); | |
2612 | ASSERT(namelen == args->namelen); | |
2613 | ASSERT(memcmp(name, args->name, namelen) == 0); | |
2614 | #endif /* DEBUG */ | |
2615 | ||
2616 | entry->flags &= ~XFS_ATTR_INCOMPLETE; | |
2617 | xfs_da_log_buf(args->trans, bp, | |
2618 | XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); | |
2619 | ||
2620 | if (args->rmtblkno) { | |
2621 | ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0); | |
2622 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); | |
2623 | INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno); | |
2624 | INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen); | |
2625 | xfs_da_log_buf(args->trans, bp, | |
2626 | XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt))); | |
2627 | } | |
2628 | xfs_da_buf_done(bp); | |
2629 | ||
2630 | /* | |
2631 | * Commit the flag value change and start the next trans in series. | |
2632 | */ | |
2633 | error = xfs_attr_rolltrans(&args->trans, args->dp); | |
2634 | ||
2635 | return(error); | |
2636 | } | |
2637 | ||
2638 | /* | |
2639 | * Set the INCOMPLETE flag on an entry in a leaf block. | |
2640 | */ | |
2641 | int | |
2642 | xfs_attr_leaf_setflag(xfs_da_args_t *args) | |
2643 | { | |
2644 | xfs_attr_leafblock_t *leaf; | |
2645 | xfs_attr_leaf_entry_t *entry; | |
2646 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2647 | xfs_dabuf_t *bp; | |
2648 | int error; | |
2649 | ||
2650 | /* | |
2651 | * Set up the operation. | |
2652 | */ | |
2653 | error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, | |
2654 | XFS_ATTR_FORK); | |
2655 | if (error) { | |
2656 | return(error); | |
2657 | } | |
2658 | ASSERT(bp != NULL); | |
2659 | ||
2660 | leaf = bp->data; | |
2661 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
2662 | == XFS_ATTR_LEAF_MAGIC); | |
2663 | ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT)); | |
2664 | ASSERT(args->index >= 0); | |
2665 | entry = &leaf->entries[ args->index ]; | |
2666 | ||
2667 | ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0); | |
2668 | entry->flags |= XFS_ATTR_INCOMPLETE; | |
2669 | xfs_da_log_buf(args->trans, bp, | |
2670 | XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); | |
2671 | if ((entry->flags & XFS_ATTR_LOCAL) == 0) { | |
2672 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); | |
2673 | name_rmt->valueblk = 0; | |
2674 | name_rmt->valuelen = 0; | |
2675 | xfs_da_log_buf(args->trans, bp, | |
2676 | XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt))); | |
2677 | } | |
2678 | xfs_da_buf_done(bp); | |
2679 | ||
2680 | /* | |
2681 | * Commit the flag value change and start the next trans in series. | |
2682 | */ | |
2683 | error = xfs_attr_rolltrans(&args->trans, args->dp); | |
2684 | ||
2685 | return(error); | |
2686 | } | |
2687 | ||
2688 | /* | |
2689 | * In a single transaction, clear the INCOMPLETE flag on the leaf entry | |
2690 | * given by args->blkno/index and set the INCOMPLETE flag on the leaf | |
2691 | * entry given by args->blkno2/index2. | |
2692 | * | |
2693 | * Note that they could be in different blocks, or in the same block. | |
2694 | */ | |
2695 | int | |
2696 | xfs_attr_leaf_flipflags(xfs_da_args_t *args) | |
2697 | { | |
2698 | xfs_attr_leafblock_t *leaf1, *leaf2; | |
2699 | xfs_attr_leaf_entry_t *entry1, *entry2; | |
2700 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2701 | xfs_dabuf_t *bp1, *bp2; | |
2702 | int error; | |
2703 | #ifdef DEBUG | |
2704 | xfs_attr_leaf_name_local_t *name_loc; | |
2705 | int namelen1, namelen2; | |
2706 | char *name1, *name2; | |
2707 | #endif /* DEBUG */ | |
2708 | ||
2709 | /* | |
2710 | * Read the block containing the "old" attr | |
2711 | */ | |
2712 | error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1, | |
2713 | XFS_ATTR_FORK); | |
2714 | if (error) { | |
2715 | return(error); | |
2716 | } | |
2717 | ASSERT(bp1 != NULL); | |
2718 | ||
2719 | /* | |
2720 | * Read the block containing the "new" attr, if it is different | |
2721 | */ | |
2722 | if (args->blkno2 != args->blkno) { | |
2723 | error = xfs_da_read_buf(args->trans, args->dp, args->blkno2, | |
2724 | -1, &bp2, XFS_ATTR_FORK); | |
2725 | if (error) { | |
2726 | return(error); | |
2727 | } | |
2728 | ASSERT(bp2 != NULL); | |
2729 | } else { | |
2730 | bp2 = bp1; | |
2731 | } | |
2732 | ||
2733 | leaf1 = bp1->data; | |
2734 | ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) | |
2735 | == XFS_ATTR_LEAF_MAGIC); | |
2736 | ASSERT(args->index < INT_GET(leaf1->hdr.count, ARCH_CONVERT)); | |
2737 | ASSERT(args->index >= 0); | |
2738 | entry1 = &leaf1->entries[ args->index ]; | |
2739 | ||
2740 | leaf2 = bp2->data; | |
2741 | ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) | |
2742 | == XFS_ATTR_LEAF_MAGIC); | |
2743 | ASSERT(args->index2 < INT_GET(leaf2->hdr.count, ARCH_CONVERT)); | |
2744 | ASSERT(args->index2 >= 0); | |
2745 | entry2 = &leaf2->entries[ args->index2 ]; | |
2746 | ||
2747 | #ifdef DEBUG | |
2748 | if (entry1->flags & XFS_ATTR_LOCAL) { | |
2749 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index); | |
2750 | namelen1 = name_loc->namelen; | |
2751 | name1 = (char *)name_loc->nameval; | |
2752 | } else { | |
2753 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index); | |
2754 | namelen1 = name_rmt->namelen; | |
2755 | name1 = (char *)name_rmt->name; | |
2756 | } | |
2757 | if (entry2->flags & XFS_ATTR_LOCAL) { | |
2758 | name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2); | |
2759 | namelen2 = name_loc->namelen; | |
2760 | name2 = (char *)name_loc->nameval; | |
2761 | } else { | |
2762 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2); | |
2763 | namelen2 = name_rmt->namelen; | |
2764 | name2 = (char *)name_rmt->name; | |
2765 | } | |
2766 | ASSERT(INT_GET(entry1->hashval, ARCH_CONVERT) == INT_GET(entry2->hashval, ARCH_CONVERT)); | |
2767 | ASSERT(namelen1 == namelen2); | |
2768 | ASSERT(memcmp(name1, name2, namelen1) == 0); | |
2769 | #endif /* DEBUG */ | |
2770 | ||
2771 | ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE); | |
2772 | ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0); | |
2773 | ||
2774 | entry1->flags &= ~XFS_ATTR_INCOMPLETE; | |
2775 | xfs_da_log_buf(args->trans, bp1, | |
2776 | XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1))); | |
2777 | if (args->rmtblkno) { | |
2778 | ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0); | |
2779 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index); | |
2780 | INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno); | |
2781 | INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen); | |
2782 | xfs_da_log_buf(args->trans, bp1, | |
2783 | XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt))); | |
2784 | } | |
2785 | ||
2786 | entry2->flags |= XFS_ATTR_INCOMPLETE; | |
2787 | xfs_da_log_buf(args->trans, bp2, | |
2788 | XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2))); | |
2789 | if ((entry2->flags & XFS_ATTR_LOCAL) == 0) { | |
2790 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2); | |
2791 | name_rmt->valueblk = 0; | |
2792 | name_rmt->valuelen = 0; | |
2793 | xfs_da_log_buf(args->trans, bp2, | |
2794 | XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt))); | |
2795 | } | |
2796 | xfs_da_buf_done(bp1); | |
2797 | if (bp1 != bp2) | |
2798 | xfs_da_buf_done(bp2); | |
2799 | ||
2800 | /* | |
2801 | * Commit the flag value change and start the next trans in series. | |
2802 | */ | |
2803 | error = xfs_attr_rolltrans(&args->trans, args->dp); | |
2804 | ||
2805 | return(error); | |
2806 | } | |
2807 | ||
2808 | /*======================================================================== | |
2809 | * Indiscriminately delete the entire attribute fork | |
2810 | *========================================================================*/ | |
2811 | ||
2812 | /* | |
2813 | * Recurse (gasp!) through the attribute nodes until we find leaves. | |
2814 | * We're doing a depth-first traversal in order to invalidate everything. | |
2815 | */ | |
2816 | int | |
2817 | xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp) | |
2818 | { | |
2819 | xfs_da_blkinfo_t *info; | |
2820 | xfs_daddr_t blkno; | |
2821 | xfs_dabuf_t *bp; | |
2822 | int error; | |
2823 | ||
2824 | /* | |
2825 | * Read block 0 to see what we have to work with. | |
2826 | * We only get here if we have extents, since we remove | |
2827 | * the extents in reverse order the extent containing | |
2828 | * block 0 must still be there. | |
2829 | */ | |
2830 | error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK); | |
2831 | if (error) | |
2832 | return(error); | |
2833 | blkno = xfs_da_blkno(bp); | |
2834 | ||
2835 | /* | |
2836 | * Invalidate the tree, even if the "tree" is only a single leaf block. | |
2837 | * This is a depth-first traversal! | |
2838 | */ | |
2839 | info = bp->data; | |
2840 | if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) { | |
2841 | error = xfs_attr_node_inactive(trans, dp, bp, 1); | |
2842 | } else if (INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) { | |
2843 | error = xfs_attr_leaf_inactive(trans, dp, bp); | |
2844 | } else { | |
2845 | error = XFS_ERROR(EIO); | |
2846 | xfs_da_brelse(*trans, bp); | |
2847 | } | |
2848 | if (error) | |
2849 | return(error); | |
2850 | ||
2851 | /* | |
2852 | * Invalidate the incore copy of the root block. | |
2853 | */ | |
2854 | error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK); | |
2855 | if (error) | |
2856 | return(error); | |
2857 | xfs_da_binval(*trans, bp); /* remove from cache */ | |
2858 | /* | |
2859 | * Commit the invalidate and start the next transaction. | |
2860 | */ | |
2861 | error = xfs_attr_rolltrans(trans, dp); | |
2862 | ||
2863 | return (error); | |
2864 | } | |
2865 | ||
2866 | /* | |
2867 | * Recurse (gasp!) through the attribute nodes until we find leaves. | |
2868 | * We're doing a depth-first traversal in order to invalidate everything. | |
2869 | */ | |
ba0f32d4 | 2870 | STATIC int |
1da177e4 LT |
2871 | xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp, |
2872 | int level) | |
2873 | { | |
2874 | xfs_da_blkinfo_t *info; | |
2875 | xfs_da_intnode_t *node; | |
2876 | xfs_dablk_t child_fsb; | |
2877 | xfs_daddr_t parent_blkno, child_blkno; | |
2878 | int error, count, i; | |
2879 | xfs_dabuf_t *child_bp; | |
2880 | ||
2881 | /* | |
2882 | * Since this code is recursive (gasp!) we must protect ourselves. | |
2883 | */ | |
2884 | if (level > XFS_DA_NODE_MAXDEPTH) { | |
2885 | xfs_da_brelse(*trans, bp); /* no locks for later trans */ | |
2886 | return(XFS_ERROR(EIO)); | |
2887 | } | |
2888 | ||
2889 | node = bp->data; | |
2890 | ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) | |
2891 | == XFS_DA_NODE_MAGIC); | |
2892 | parent_blkno = xfs_da_blkno(bp); /* save for re-read later */ | |
2893 | count = INT_GET(node->hdr.count, ARCH_CONVERT); | |
2894 | if (!count) { | |
2895 | xfs_da_brelse(*trans, bp); | |
2896 | return(0); | |
2897 | } | |
2898 | child_fsb = INT_GET(node->btree[0].before, ARCH_CONVERT); | |
2899 | xfs_da_brelse(*trans, bp); /* no locks for later trans */ | |
2900 | ||
2901 | /* | |
2902 | * If this is the node level just above the leaves, simply loop | |
2903 | * over the leaves removing all of them. If this is higher up | |
2904 | * in the tree, recurse downward. | |
2905 | */ | |
2906 | for (i = 0; i < count; i++) { | |
2907 | /* | |
2908 | * Read the subsidiary block to see what we have to work with. | |
2909 | * Don't do this in a transaction. This is a depth-first | |
2910 | * traversal of the tree so we may deal with many blocks | |
2911 | * before we come back to this one. | |
2912 | */ | |
2913 | error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp, | |
2914 | XFS_ATTR_FORK); | |
2915 | if (error) | |
2916 | return(error); | |
2917 | if (child_bp) { | |
2918 | /* save for re-read later */ | |
2919 | child_blkno = xfs_da_blkno(child_bp); | |
2920 | ||
2921 | /* | |
2922 | * Invalidate the subtree, however we have to. | |
2923 | */ | |
2924 | info = child_bp->data; | |
2925 | if (INT_GET(info->magic, ARCH_CONVERT) | |
2926 | == XFS_DA_NODE_MAGIC) { | |
2927 | error = xfs_attr_node_inactive(trans, dp, | |
2928 | child_bp, level+1); | |
2929 | } else if (INT_GET(info->magic, ARCH_CONVERT) | |
2930 | == XFS_ATTR_LEAF_MAGIC) { | |
2931 | error = xfs_attr_leaf_inactive(trans, dp, | |
2932 | child_bp); | |
2933 | } else { | |
2934 | error = XFS_ERROR(EIO); | |
2935 | xfs_da_brelse(*trans, child_bp); | |
2936 | } | |
2937 | if (error) | |
2938 | return(error); | |
2939 | ||
2940 | /* | |
2941 | * Remove the subsidiary block from the cache | |
2942 | * and from the log. | |
2943 | */ | |
2944 | error = xfs_da_get_buf(*trans, dp, 0, child_blkno, | |
2945 | &child_bp, XFS_ATTR_FORK); | |
2946 | if (error) | |
2947 | return(error); | |
2948 | xfs_da_binval(*trans, child_bp); | |
2949 | } | |
2950 | ||
2951 | /* | |
2952 | * If we're not done, re-read the parent to get the next | |
2953 | * child block number. | |
2954 | */ | |
2955 | if ((i+1) < count) { | |
2956 | error = xfs_da_read_buf(*trans, dp, 0, parent_blkno, | |
2957 | &bp, XFS_ATTR_FORK); | |
2958 | if (error) | |
2959 | return(error); | |
2960 | child_fsb = INT_GET(node->btree[i+1].before, ARCH_CONVERT); | |
2961 | xfs_da_brelse(*trans, bp); | |
2962 | } | |
2963 | /* | |
2964 | * Atomically commit the whole invalidate stuff. | |
2965 | */ | |
2966 | if ((error = xfs_attr_rolltrans(trans, dp))) | |
2967 | return (error); | |
2968 | } | |
2969 | ||
2970 | return(0); | |
2971 | } | |
2972 | ||
2973 | /* | |
2974 | * Invalidate all of the "remote" value regions pointed to by a particular | |
2975 | * leaf block. | |
2976 | * Note that we must release the lock on the buffer so that we are not | |
2977 | * caught holding something that the logging code wants to flush to disk. | |
2978 | */ | |
ba0f32d4 | 2979 | STATIC int |
1da177e4 LT |
2980 | xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp) |
2981 | { | |
2982 | xfs_attr_leafblock_t *leaf; | |
2983 | xfs_attr_leaf_entry_t *entry; | |
2984 | xfs_attr_leaf_name_remote_t *name_rmt; | |
2985 | xfs_attr_inactive_list_t *list, *lp; | |
2986 | int error, count, size, tmp, i; | |
2987 | ||
2988 | leaf = bp->data; | |
2989 | ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) | |
2990 | == XFS_ATTR_LEAF_MAGIC); | |
2991 | ||
2992 | /* | |
2993 | * Count the number of "remote" value extents. | |
2994 | */ | |
2995 | count = 0; | |
2996 | entry = &leaf->entries[0]; | |
2997 | for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { | |
2998 | if ( INT_GET(entry->nameidx, ARCH_CONVERT) | |
2999 | && ((entry->flags & XFS_ATTR_LOCAL) == 0)) { | |
3000 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); | |
3001 | if (name_rmt->valueblk) | |
3002 | count++; | |
3003 | } | |
3004 | } | |
3005 | ||
3006 | /* | |
3007 | * If there are no "remote" values, we're done. | |
3008 | */ | |
3009 | if (count == 0) { | |
3010 | xfs_da_brelse(*trans, bp); | |
3011 | return(0); | |
3012 | } | |
3013 | ||
3014 | /* | |
3015 | * Allocate storage for a list of all the "remote" value extents. | |
3016 | */ | |
3017 | size = count * sizeof(xfs_attr_inactive_list_t); | |
3018 | list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP); | |
3019 | ||
3020 | /* | |
3021 | * Identify each of the "remote" value extents. | |
3022 | */ | |
3023 | lp = list; | |
3024 | entry = &leaf->entries[0]; | |
3025 | for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { | |
3026 | if ( INT_GET(entry->nameidx, ARCH_CONVERT) | |
3027 | && ((entry->flags & XFS_ATTR_LOCAL) == 0)) { | |
3028 | name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); | |
3029 | if (name_rmt->valueblk) { | |
3030 | /* both on-disk, don't endian flip twice */ | |
3031 | lp->valueblk = name_rmt->valueblk; | |
3032 | INT_SET(lp->valuelen, ARCH_CONVERT, | |
3033 | XFS_B_TO_FSB(dp->i_mount, | |
3034 | INT_GET(name_rmt->valuelen, | |
3035 | ARCH_CONVERT))); | |
3036 | lp++; | |
3037 | } | |
3038 | } | |
3039 | } | |
3040 | xfs_da_brelse(*trans, bp); /* unlock for trans. in freextent() */ | |
3041 | ||
3042 | /* | |
3043 | * Invalidate each of the "remote" value extents. | |
3044 | */ | |
3045 | error = 0; | |
3046 | for (lp = list, i = 0; i < count; i++, lp++) { | |
3047 | tmp = xfs_attr_leaf_freextent(trans, dp, | |
3048 | INT_GET(lp->valueblk, | |
3049 | ARCH_CONVERT), | |
3050 | INT_GET(lp->valuelen, | |
3051 | ARCH_CONVERT)); | |
3052 | if (error == 0) | |
3053 | error = tmp; /* save only the 1st errno */ | |
3054 | } | |
3055 | ||
3056 | kmem_free((xfs_caddr_t)list, size); | |
3057 | return(error); | |
3058 | } | |
3059 | ||
3060 | /* | |
3061 | * Look at all the extents for this logical region, | |
3062 | * invalidate any buffers that are incore/in transactions. | |
3063 | */ | |
ba0f32d4 | 3064 | STATIC int |
1da177e4 LT |
3065 | xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp, |
3066 | xfs_dablk_t blkno, int blkcnt) | |
3067 | { | |
3068 | xfs_bmbt_irec_t map; | |
3069 | xfs_dablk_t tblkno; | |
3070 | int tblkcnt, dblkcnt, nmap, error; | |
3071 | xfs_daddr_t dblkno; | |
3072 | xfs_buf_t *bp; | |
3073 | ||
3074 | /* | |
3075 | * Roll through the "value", invalidating the attribute value's | |
3076 | * blocks. | |
3077 | */ | |
3078 | tblkno = blkno; | |
3079 | tblkcnt = blkcnt; | |
3080 | while (tblkcnt > 0) { | |
3081 | /* | |
3082 | * Try to remember where we decided to put the value. | |
3083 | */ | |
3084 | nmap = 1; | |
3085 | error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt, | |
3086 | XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, | |
3087 | NULL, 0, &map, &nmap, NULL); | |
3088 | if (error) { | |
3089 | return(error); | |
3090 | } | |
3091 | ASSERT(nmap == 1); | |
3092 | ASSERT(map.br_startblock != DELAYSTARTBLOCK); | |
3093 | ||
3094 | /* | |
3095 | * If it's a hole, these are already unmapped | |
3096 | * so there's nothing to invalidate. | |
3097 | */ | |
3098 | if (map.br_startblock != HOLESTARTBLOCK) { | |
3099 | ||
3100 | dblkno = XFS_FSB_TO_DADDR(dp->i_mount, | |
3101 | map.br_startblock); | |
3102 | dblkcnt = XFS_FSB_TO_BB(dp->i_mount, | |
3103 | map.br_blockcount); | |
3104 | bp = xfs_trans_get_buf(*trans, | |
3105 | dp->i_mount->m_ddev_targp, | |
3106 | dblkno, dblkcnt, XFS_BUF_LOCK); | |
3107 | xfs_trans_binval(*trans, bp); | |
3108 | /* | |
3109 | * Roll to next transaction. | |
3110 | */ | |
3111 | if ((error = xfs_attr_rolltrans(trans, dp))) | |
3112 | return (error); | |
3113 | } | |
3114 | ||
3115 | tblkno += map.br_blockcount; | |
3116 | tblkcnt -= map.br_blockcount; | |
3117 | } | |
3118 | ||
3119 | return(0); | |
3120 | } | |
3121 | ||
3122 | ||
3123 | /* | |
3124 | * Roll from one trans in the sequence of PERMANENT transactions to the next. | |
3125 | */ | |
3126 | int | |
3127 | xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp) | |
3128 | { | |
3129 | xfs_trans_t *trans; | |
3130 | unsigned int logres, count; | |
3131 | int error; | |
3132 | ||
3133 | /* | |
3134 | * Ensure that the inode is always logged. | |
3135 | */ | |
3136 | trans = *transp; | |
3137 | xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE); | |
3138 | ||
3139 | /* | |
3140 | * Copy the critical parameters from one trans to the next. | |
3141 | */ | |
3142 | logres = trans->t_log_res; | |
3143 | count = trans->t_log_count; | |
3144 | *transp = xfs_trans_dup(trans); | |
3145 | ||
3146 | /* | |
3147 | * Commit the current transaction. | |
3148 | * If this commit failed, then it'd just unlock those items that | |
3149 | * are not marked ihold. That also means that a filesystem shutdown | |
3150 | * is in progress. The caller takes the responsibility to cancel | |
3151 | * the duplicate transaction that gets returned. | |
3152 | */ | |
3153 | if ((error = xfs_trans_commit(trans, 0, NULL))) | |
3154 | return (error); | |
3155 | ||
3156 | trans = *transp; | |
3157 | ||
3158 | /* | |
3159 | * Reserve space in the log for th next transaction. | |
3160 | * This also pushes items in the "AIL", the list of logged items, | |
3161 | * out to disk if they are taking up space at the tail of the log | |
3162 | * that we want to use. This requires that either nothing be locked | |
3163 | * across this call, or that anything that is locked be logged in | |
3164 | * the prior and the next transactions. | |
3165 | */ | |
3166 | error = xfs_trans_reserve(trans, 0, logres, 0, | |
3167 | XFS_TRANS_PERM_LOG_RES, count); | |
3168 | /* | |
3169 | * Ensure that the inode is in the new transaction and locked. | |
3170 | */ | |
3171 | if (!error) { | |
3172 | xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL); | |
3173 | xfs_trans_ihold(trans, dp); | |
3174 | } | |
3175 | return (error); | |
3176 | ||
3177 | } |