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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_ialloc_btree.h"
35#include "xfs_alloc.h"
36#include "xfs_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_dir_sf.h"
38#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110039#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110042#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "xfs_bmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include "xfs_attr.h"
45#include "xfs_attr_leaf.h"
46#include "xfs_error.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
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 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100061STATIC int xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t which_block,
62 xfs_dabuf_t **bpp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
64 int freemap_index);
65STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer);
66STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state,
67 xfs_da_state_blk_t *blk1,
68 xfs_da_state_blk_t *blk2);
69STATIC 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
75/*
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100076 * Routines used for shrinking the Btree.
77 */
78STATIC int xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp,
79 xfs_dabuf_t *bp, int level);
80STATIC int xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp,
81 xfs_dabuf_t *bp);
82STATIC int xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
83 xfs_dablk_t blkno, int blkcnt);
84
85/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 * Utility routines.
87 */
88STATIC 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);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100093STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index);
94STATIC int xfs_attr_put_listent(xfs_attr_list_context_t *context,
95 attrnames_t *, char *name, int namelen,
96 int valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98
99/*========================================================================
Nathan Scottd8cc8902005-11-02 10:34:53 +1100100 * External routines when attribute fork size < XFS_LITINO(mp).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 *========================================================================*/
102
103/*
Nathan Scottd8cc8902005-11-02 10:34:53 +1100104 * 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.
111 */
112int
113xfs_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
Nathan Scottd8cc8902005-11-02 10:34:53 +1100120 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
Nathan Scott13059ff2006-01-11 15:32:01 +1100131 if (!(mp->m_flags & XFS_MOUNT_ATTR2)) {
Nathan Scottda087ba2005-11-02 15:00:20 +1100132 if (bytes <= XFS_IFORK_ASIZE(dp))
133 return mp->m_attroffset >> 3;
134 return 0;
135 }
136
Nathan Scottd8cc8902005-11-02 10:34:53 +1100137 /* 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 */
155STATIC void
156xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp)
157{
158 unsigned long s;
159
Nathan Scott13059ff2006-01-11 15:32:01 +1100160 if ((mp->m_flags & XFS_MOUNT_ATTR2) &&
Nathan Scottd8cc8902005-11-02 10:34:53 +1100161 !(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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * Create the initial contents of a shortform attribute list.
174 */
Nathan Scottd8cc8902005-11-02 10:34:53 +1100175void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176xfs_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;
Nathan Scott3b244aa2006-03-17 17:29:25 +1100197 hdr->totsize = cpu_to_be16(sizeof(*hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
201/*
202 * Add a name/value pair to the shortform attribute list.
203 * Overflow from the inode has already been checked for.
204 */
Nathan Scottd8cc8902005-11-02 10:34:53 +1100205void
206xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
208 xfs_attr_shortform_t *sf;
209 xfs_attr_sf_entry_t *sfe;
210 int i, offset, size;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100211 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 xfs_inode_t *dp;
213 xfs_ifork_t *ifp;
214
215 dp = args->dp;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100216 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 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];
Nathan Scott3b244aa2006-03-17 17:29:25 +1100227 for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
Nathan Scottd8cc8902005-11-02 10:34:53 +1100228#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 if (sfe->namelen != args->namelen)
230 continue;
231 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
232 continue;
233 if (((args->flags & ATTR_SECURE) != 0) !=
234 ((sfe->flags & XFS_ATTR_SECURE) != 0))
235 continue;
236 if (((args->flags & ATTR_ROOT) != 0) !=
237 ((sfe->flags & XFS_ATTR_ROOT) != 0))
238 continue;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100239 ASSERT(0);
240#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 }
242
243 offset = (char *)sfe - (char *)sf;
244 size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
245 xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
246 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
247 sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
248
249 sfe->namelen = args->namelen;
Nathan Scott3b244aa2006-03-17 17:29:25 +1100250 sfe->valuelen = args->valuelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
252 ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
253 memcpy(sfe->nameval, args->name, args->namelen);
254 memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);
Nathan Scott3b244aa2006-03-17 17:29:25 +1100255 sf->hdr.count++;
256 be16_add(&sf->hdr.totsize, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
258
Nathan Scottd8cc8902005-11-02 10:34:53 +1100259 xfs_sbversion_add_attr2(mp, args->trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
262/*
Nathan Scottd8cc8902005-11-02 10:34:53 +1100263 * Remove an attribute from the shortform attribute list structure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 */
265int
266xfs_attr_shortform_remove(xfs_da_args_t *args)
267{
268 xfs_attr_shortform_t *sf;
269 xfs_attr_sf_entry_t *sfe;
270 int base, size=0, end, totsize, i;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100271 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 xfs_inode_t *dp;
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 dp = args->dp;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100275 mp = dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 base = sizeof(xfs_attr_sf_hdr_t);
277 sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
278 sfe = &sf->list[0];
Nathan Scott3b244aa2006-03-17 17:29:25 +1100279 end = sf->hdr.count;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100280 for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 base += size, i++) {
282 size = XFS_ATTR_SF_ENTSIZE(sfe);
283 if (sfe->namelen != args->namelen)
284 continue;
285 if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
286 continue;
287 if (((args->flags & ATTR_SECURE) != 0) !=
288 ((sfe->flags & XFS_ATTR_SECURE) != 0))
289 continue;
290 if (((args->flags & ATTR_ROOT) != 0) !=
291 ((sfe->flags & XFS_ATTR_ROOT) != 0))
292 continue;
293 break;
294 }
Nathan Scottd8cc8902005-11-02 10:34:53 +1100295 if (i == end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return(XFS_ERROR(ENOATTR));
297
Nathan Scottd8cc8902005-11-02 10:34:53 +1100298 /*
299 * Fix up the attribute fork data, covering the hole
300 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 end = base + size;
Nathan Scott3b244aa2006-03-17 17:29:25 +1100302 totsize = be16_to_cpu(sf->hdr.totsize);
Nathan Scottd8cc8902005-11-02 10:34:53 +1100303 if (end != totsize)
304 memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end);
Nathan Scott3b244aa2006-03-17 17:29:25 +1100305 sf->hdr.count--;
306 be16_add(&sf->hdr.totsize, -size);
Nathan Scottd8cc8902005-11-02 10:34:53 +1100307
308 /*
309 * Fix up the start offset of the attribute fork
310 */
311 totsize -= size;
Nathan Scotte0144ca2005-11-25 16:42:22 +1100312 if (totsize == sizeof(xfs_attr_sf_hdr_t) && !args->addname &&
Nathan Scott13059ff2006-01-11 15:32:01 +1100313 (mp->m_flags & XFS_MOUNT_ATTR2)) {
Nathan Scottd8cc8902005-11-02 10:34:53 +1100314 /*
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);
Nathan Scotte0144ca2005-11-25 16:42:22 +1100331 ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) || args->addname ||
Nathan Scott13059ff2006-01-11 15:32:01 +1100332 !(mp->m_flags & XFS_MOUNT_ATTR2));
Nathan Scottd8cc8902005-11-02 10:34:53 +1100333 dp->i_afp->if_ext_max =
334 XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
335 dp->i_df.if_ext_max =
336 XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
337 xfs_trans_log_inode(args->trans, dp,
338 XFS_ILOG_CORE | XFS_ILOG_ADATA);
339 }
340
341 xfs_sbversion_add_attr2(mp, args->trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 return(0);
344}
345
346/*
347 * Look up a name in a shortform attribute list structure.
348 */
349/*ARGSUSED*/
350int
351xfs_attr_shortform_lookup(xfs_da_args_t *args)
352{
353 xfs_attr_shortform_t *sf;
354 xfs_attr_sf_entry_t *sfe;
355 int i;
356 xfs_ifork_t *ifp;
357
358 ifp = args->dp->i_afp;
359 ASSERT(ifp->if_flags & XFS_IFINLINE);
360 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
361 sfe = &sf->list[0];
Nathan Scott3b244aa2006-03-17 17:29:25 +1100362 for (i = 0; i < sf->hdr.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
364 if (sfe->namelen != args->namelen)
365 continue;
366 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
367 continue;
368 if (((args->flags & ATTR_SECURE) != 0) !=
369 ((sfe->flags & XFS_ATTR_SECURE) != 0))
370 continue;
371 if (((args->flags & ATTR_ROOT) != 0) !=
372 ((sfe->flags & XFS_ATTR_ROOT) != 0))
373 continue;
374 return(XFS_ERROR(EEXIST));
375 }
376 return(XFS_ERROR(ENOATTR));
377}
378
379/*
380 * Look up a name in a shortform attribute list structure.
381 */
382/*ARGSUSED*/
383int
384xfs_attr_shortform_getvalue(xfs_da_args_t *args)
385{
386 xfs_attr_shortform_t *sf;
387 xfs_attr_sf_entry_t *sfe;
388 int i;
389
390 ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE);
391 sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
392 sfe = &sf->list[0];
Nathan Scott3b244aa2006-03-17 17:29:25 +1100393 for (i = 0; i < sf->hdr.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
395 if (sfe->namelen != args->namelen)
396 continue;
397 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
398 continue;
399 if (((args->flags & ATTR_SECURE) != 0) !=
400 ((sfe->flags & XFS_ATTR_SECURE) != 0))
401 continue;
402 if (((args->flags & ATTR_ROOT) != 0) !=
403 ((sfe->flags & XFS_ATTR_ROOT) != 0))
404 continue;
405 if (args->flags & ATTR_KERNOVAL) {
Nathan Scott3b244aa2006-03-17 17:29:25 +1100406 args->valuelen = sfe->valuelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 return(XFS_ERROR(EEXIST));
408 }
Nathan Scott3b244aa2006-03-17 17:29:25 +1100409 if (args->valuelen < sfe->valuelen) {
410 args->valuelen = sfe->valuelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 return(XFS_ERROR(ERANGE));
412 }
Nathan Scott3b244aa2006-03-17 17:29:25 +1100413 args->valuelen = sfe->valuelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 memcpy(args->value, &sfe->nameval[args->namelen],
415 args->valuelen);
416 return(XFS_ERROR(EEXIST));
417 }
418 return(XFS_ERROR(ENOATTR));
419}
420
421/*
422 * Convert from using the shortform to the leaf.
423 */
424int
425xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
426{
427 xfs_inode_t *dp;
428 xfs_attr_shortform_t *sf;
429 xfs_attr_sf_entry_t *sfe;
430 xfs_da_args_t nargs;
431 char *tmpbuffer;
432 int error, i, size;
433 xfs_dablk_t blkno;
434 xfs_dabuf_t *bp;
435 xfs_ifork_t *ifp;
436
437 dp = args->dp;
438 ifp = dp->i_afp;
439 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
Nathan Scott3b244aa2006-03-17 17:29:25 +1100440 size = be16_to_cpu(sf->hdr.totsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 tmpbuffer = kmem_alloc(size, KM_SLEEP);
442 ASSERT(tmpbuffer != NULL);
443 memcpy(tmpbuffer, ifp->if_u1.if_data, size);
444 sf = (xfs_attr_shortform_t *)tmpbuffer;
445
446 xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
447 bp = NULL;
448 error = xfs_da_grow_inode(args, &blkno);
449 if (error) {
450 /*
451 * If we hit an IO error middle of the transaction inside
452 * grow_inode(), we may have inconsistent data. Bail out.
453 */
454 if (error == EIO)
455 goto out;
456 xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
457 memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
458 goto out;
459 }
460
461 ASSERT(blkno == 0);
462 error = xfs_attr_leaf_create(args, blkno, &bp);
463 if (error) {
464 error = xfs_da_shrink_inode(args, 0, bp);
465 bp = NULL;
466 if (error)
467 goto out;
468 xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
469 memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
470 goto out;
471 }
472
473 memset((char *)&nargs, 0, sizeof(nargs));
474 nargs.dp = dp;
475 nargs.firstblock = args->firstblock;
476 nargs.flist = args->flist;
477 nargs.total = args->total;
478 nargs.whichfork = XFS_ATTR_FORK;
479 nargs.trans = args->trans;
480 nargs.oknoent = 1;
481
482 sfe = &sf->list[0];
Nathan Scott3b244aa2006-03-17 17:29:25 +1100483 for (i = 0; i < sf->hdr.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 nargs.name = (char *)sfe->nameval;
485 nargs.namelen = sfe->namelen;
486 nargs.value = (char *)&sfe->nameval[nargs.namelen];
Nathan Scott3b244aa2006-03-17 17:29:25 +1100487 nargs.valuelen = sfe->valuelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 nargs.hashval = xfs_da_hashname((char *)sfe->nameval,
489 sfe->namelen);
490 nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
491 ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
492 error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */
493 ASSERT(error == ENOATTR);
494 error = xfs_attr_leaf_add(bp, &nargs);
495 ASSERT(error != ENOSPC);
496 if (error)
497 goto out;
498 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
499 }
500 error = 0;
501
502out:
503 if(bp)
504 xfs_da_buf_done(bp);
505 kmem_free(tmpbuffer, size);
506 return(error);
507}
508
509STATIC int
510xfs_attr_shortform_compare(const void *a, const void *b)
511{
512 xfs_attr_sf_sort_t *sa, *sb;
513
514 sa = (xfs_attr_sf_sort_t *)a;
515 sb = (xfs_attr_sf_sort_t *)b;
Nathan Scott984a0812006-03-17 17:29:31 +1100516 if (sa->hash < sb->hash) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return(-1);
Nathan Scott984a0812006-03-17 17:29:31 +1100518 } else if (sa->hash > sb->hash) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 return(1);
520 } else {
521 return(sa->entno - sb->entno);
522 }
523}
524
525/*
526 * Copy out entries of shortform attribute lists for attr_list().
Nathan Scottc41564b2006-03-29 08:55:14 +1000527 * Shortform attribute lists are not stored in hashval sorted order.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 * If the output buffer is not large enough to hold them all, then we
529 * we have to calculate each entries' hashvalue and sort them before
530 * we can begin returning them to the user.
531 */
532/*ARGSUSED*/
533int
534xfs_attr_shortform_list(xfs_attr_list_context_t *context)
535{
536 attrlist_cursor_kern_t *cursor;
537 xfs_attr_sf_sort_t *sbuf, *sbp;
538 xfs_attr_shortform_t *sf;
539 xfs_attr_sf_entry_t *sfe;
540 xfs_inode_t *dp;
541 int sbsize, nsbuf, count, i;
542
543 ASSERT(context != NULL);
544 dp = context->dp;
545 ASSERT(dp != NULL);
546 ASSERT(dp->i_afp != NULL);
547 sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
548 ASSERT(sf != NULL);
549 if (!sf->hdr.count)
550 return(0);
551 cursor = context->cursor;
552 ASSERT(cursor != NULL);
553
554 xfs_attr_trace_l_c("sf start", context);
555
556 /*
557 * If the buffer is large enough, do not bother with sorting.
558 * Note the generous fudge factor of 16 overhead bytes per entry.
559 */
Nathan Scott3b244aa2006-03-17 17:29:25 +1100560 if ((dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize) {
561 for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 attrnames_t *namesp;
563
564 if (((context->flags & ATTR_SECURE) != 0) !=
565 ((sfe->flags & XFS_ATTR_SECURE) != 0) &&
566 !(context->flags & ATTR_KERNORMALS)) {
567 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
568 continue;
569 }
570 if (((context->flags & ATTR_ROOT) != 0) !=
571 ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
572 !(context->flags & ATTR_KERNROOTLS)) {
573 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
574 continue;
575 }
576 namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure:
577 ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted :
578 &attr_user);
579 if (context->flags & ATTR_KERNOVAL) {
580 ASSERT(context->flags & ATTR_KERNAMELS);
581 context->count += namesp->attr_namelen +
Nathan Scott3b244aa2006-03-17 17:29:25 +1100582 sfe->namelen + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 }
584 else {
585 if (xfs_attr_put_listent(context, namesp,
586 (char *)sfe->nameval,
587 (int)sfe->namelen,
Nathan Scott3b244aa2006-03-17 17:29:25 +1100588 (int)sfe->valuelen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 break;
590 }
591 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
592 }
593 xfs_attr_trace_l_c("sf big-gulp", context);
594 return(0);
595 }
596
597 /*
598 * It didn't all fit, so we have to sort everything on hashval.
599 */
Nathan Scott3b244aa2006-03-17 17:29:25 +1100600 sbsize = sf->hdr.count * sizeof(*sbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
602
603 /*
604 * Scan the attribute list for the rest of the entries, storing
605 * the relevant info from only those that match into a buffer.
606 */
607 nsbuf = 0;
Nathan Scott3b244aa2006-03-17 17:29:25 +1100608 for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (unlikely(
610 ((char *)sfe < (char *)sf) ||
611 ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
612 XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
613 XFS_ERRLEVEL_LOW,
614 context->dp->i_mount, sfe);
615 xfs_attr_trace_l_c("sf corrupted", context);
616 kmem_free(sbuf, sbsize);
617 return XFS_ERROR(EFSCORRUPTED);
618 }
619 if (((context->flags & ATTR_SECURE) != 0) !=
620 ((sfe->flags & XFS_ATTR_SECURE) != 0) &&
621 !(context->flags & ATTR_KERNORMALS)) {
622 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
623 continue;
624 }
625 if (((context->flags & ATTR_ROOT) != 0) !=
626 ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
627 !(context->flags & ATTR_KERNROOTLS)) {
628 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
629 continue;
630 }
631 sbp->entno = i;
Nathan Scott984a0812006-03-17 17:29:31 +1100632 sbp->hash = xfs_da_hashname((char *)sfe->nameval, sfe->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 sbp->name = (char *)sfe->nameval;
634 sbp->namelen = sfe->namelen;
635 /* These are bytes, and both on-disk, don't endian-flip */
636 sbp->valuelen = sfe->valuelen;
637 sbp->flags = sfe->flags;
638 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
639 sbp++;
640 nsbuf++;
641 }
642
643 /*
644 * Sort the entries on hash then entno.
645 */
Nathan Scott380b5dc2005-11-02 11:43:18 +1100646 xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648 /*
649 * Re-find our place IN THE SORTED LIST.
650 */
651 count = 0;
652 cursor->initted = 1;
653 cursor->blkno = 0;
654 for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
Nathan Scott984a0812006-03-17 17:29:31 +1100655 if (sbp->hash == cursor->hashval) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (cursor->offset == count) {
657 break;
658 }
659 count++;
Nathan Scott984a0812006-03-17 17:29:31 +1100660 } else if (sbp->hash > cursor->hashval) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 break;
662 }
663 }
664 if (i == nsbuf) {
665 kmem_free(sbuf, sbsize);
666 xfs_attr_trace_l_c("blk end", context);
667 return(0);
668 }
669
670 /*
671 * Loop putting entries into the user buffer.
672 */
673 for ( ; i < nsbuf; i++, sbp++) {
674 attrnames_t *namesp;
675
676 namesp = (sbp->flags & XFS_ATTR_SECURE) ? &attr_secure :
677 ((sbp->flags & XFS_ATTR_ROOT) ? &attr_trusted :
678 &attr_user);
679
Nathan Scott984a0812006-03-17 17:29:31 +1100680 if (cursor->hashval != sbp->hash) {
681 cursor->hashval = sbp->hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 cursor->offset = 0;
683 }
684 if (context->flags & ATTR_KERNOVAL) {
685 ASSERT(context->flags & ATTR_KERNAMELS);
686 context->count += namesp->attr_namelen +
687 sbp->namelen + 1;
688 } else {
689 if (xfs_attr_put_listent(context, namesp,
690 sbp->name, sbp->namelen,
Nathan Scott3b244aa2006-03-17 17:29:25 +1100691 sbp->valuelen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 break;
693 }
694 cursor->offset++;
695 }
696
697 kmem_free(sbuf, sbsize);
698 xfs_attr_trace_l_c("sf E-O-F", context);
699 return(0);
700}
701
702/*
703 * Check a leaf attribute block to see if all the entries would fit into
704 * a shortform attribute list.
705 */
706int
707xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp)
708{
709 xfs_attr_leafblock_t *leaf;
710 xfs_attr_leaf_entry_t *entry;
711 xfs_attr_leaf_name_local_t *name_loc;
712 int bytes, i;
713
714 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +1100715 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
717 entry = &leaf->entries[0];
718 bytes = sizeof(struct xfs_attr_sf_hdr);
Nathan Scott918ae422006-03-17 17:28:54 +1100719 for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (entry->flags & XFS_ATTR_INCOMPLETE)
721 continue; /* don't copy partial entries */
722 if (!(entry->flags & XFS_ATTR_LOCAL))
723 return(0);
724 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
725 if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
726 return(0);
Nathan Scott053b5752006-03-17 17:29:09 +1100727 if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 return(0);
729 bytes += sizeof(struct xfs_attr_sf_entry)-1
730 + name_loc->namelen
Nathan Scott053b5752006-03-17 17:29:09 +1100731 + be16_to_cpu(name_loc->valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 }
Nathan Scott13059ff2006-01-11 15:32:01 +1100733 if ((dp->i_mount->m_flags & XFS_MOUNT_ATTR2) &&
Nathan Scotte0144ca2005-11-25 16:42:22 +1100734 (bytes == sizeof(struct xfs_attr_sf_hdr)))
Nathan Scottd8cc8902005-11-02 10:34:53 +1100735 return(-1);
736 return(xfs_attr_shortform_bytesfit(dp, bytes));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737}
738
739/*
740 * Convert a leaf attribute list to shortform attribute list
741 */
742int
Nathan Scottd8cc8902005-11-02 10:34:53 +1100743xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args, int forkoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
745 xfs_attr_leafblock_t *leaf;
746 xfs_attr_leaf_entry_t *entry;
747 xfs_attr_leaf_name_local_t *name_loc;
748 xfs_da_args_t nargs;
749 xfs_inode_t *dp;
750 char *tmpbuffer;
751 int error, i;
752
753 dp = args->dp;
754 tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
755 ASSERT(tmpbuffer != NULL);
756
757 ASSERT(bp != NULL);
758 memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
759 leaf = (xfs_attr_leafblock_t *)tmpbuffer;
Nathan Scott89da0542006-03-17 17:28:40 +1100760 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
762
763 /*
764 * Clean out the prior contents of the attribute list.
765 */
766 error = xfs_da_shrink_inode(args, 0, bp);
767 if (error)
768 goto out;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100769
770 if (forkoff == -1) {
Nathan Scott13059ff2006-01-11 15:32:01 +1100771 ASSERT(dp->i_mount->m_flags & XFS_MOUNT_ATTR2);
Nathan Scotte0144ca2005-11-25 16:42:22 +1100772
Nathan Scottd8cc8902005-11-02 10:34:53 +1100773 /*
774 * Last attribute was removed, revert to original
775 * inode format making all literal area available
776 * to the data fork once more.
777 */
778 xfs_idestroy_fork(dp, XFS_ATTR_FORK);
779 dp->i_d.di_forkoff = 0;
780 dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
781 ASSERT(dp->i_d.di_anextents == 0);
782 ASSERT(dp->i_afp == NULL);
783 dp->i_df.if_ext_max =
784 XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
785 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 goto out;
Nathan Scottd8cc8902005-11-02 10:34:53 +1100787 }
788
789 xfs_attr_shortform_create(args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
791 /*
792 * Copy the attributes
793 */
794 memset((char *)&nargs, 0, sizeof(nargs));
795 nargs.dp = dp;
796 nargs.firstblock = args->firstblock;
797 nargs.flist = args->flist;
798 nargs.total = args->total;
799 nargs.whichfork = XFS_ATTR_FORK;
800 nargs.trans = args->trans;
801 nargs.oknoent = 1;
802 entry = &leaf->entries[0];
Nathan Scott918ae422006-03-17 17:28:54 +1100803 for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 if (entry->flags & XFS_ATTR_INCOMPLETE)
805 continue; /* don't copy partial entries */
806 if (!entry->nameidx)
807 continue;
808 ASSERT(entry->flags & XFS_ATTR_LOCAL);
809 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
810 nargs.name = (char *)name_loc->nameval;
811 nargs.namelen = name_loc->namelen;
812 nargs.value = (char *)&name_loc->nameval[nargs.namelen];
Nathan Scott053b5752006-03-17 17:29:09 +1100813 nargs.valuelen = be16_to_cpu(name_loc->valuelen);
Nathan Scott6b19f2d2006-03-17 17:29:02 +1100814 nargs.hashval = be32_to_cpu(entry->hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
816 ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
Nathan Scottd8cc8902005-11-02 10:34:53 +1100817 xfs_attr_shortform_add(&nargs, forkoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 }
819 error = 0;
820
821out:
822 kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
823 return(error);
824}
825
826/*
827 * Convert from using a single leaf to a root node and a leaf.
828 */
829int
830xfs_attr_leaf_to_node(xfs_da_args_t *args)
831{
832 xfs_attr_leafblock_t *leaf;
833 xfs_da_intnode_t *node;
834 xfs_inode_t *dp;
835 xfs_dabuf_t *bp1, *bp2;
836 xfs_dablk_t blkno;
837 int error;
838
839 dp = args->dp;
840 bp1 = bp2 = NULL;
841 error = xfs_da_grow_inode(args, &blkno);
842 if (error)
843 goto out;
844 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
845 XFS_ATTR_FORK);
846 if (error)
847 goto out;
848 ASSERT(bp1 != NULL);
849 bp2 = NULL;
850 error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2,
851 XFS_ATTR_FORK);
852 if (error)
853 goto out;
854 ASSERT(bp2 != NULL);
855 memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
856 xfs_da_buf_done(bp1);
857 bp1 = NULL;
858 xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
859
860 /*
861 * Set up the new root node.
862 */
863 error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
864 if (error)
865 goto out;
866 node = bp1->data;
867 leaf = bp2->data;
Nathan Scott89da0542006-03-17 17:28:40 +1100868 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 /* both on-disk, don't endian-flip twice */
870 node->btree[0].hashval =
Nathan Scott918ae422006-03-17 17:28:54 +1100871 leaf->entries[be16_to_cpu(leaf->hdr.count)-1 ].hashval;
Nathan Scott403432d2006-03-17 17:29:46 +1100872 node->btree[0].before = cpu_to_be32(blkno);
Nathan Scottfac80cc2006-03-17 17:29:56 +1100873 node->hdr.count = cpu_to_be16(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1);
875 error = 0;
876out:
877 if (bp1)
878 xfs_da_buf_done(bp1);
879 if (bp2)
880 xfs_da_buf_done(bp2);
881 return(error);
882}
883
884
885/*========================================================================
886 * Routines used for growing the Btree.
887 *========================================================================*/
888
889/*
890 * Create the initial contents of a leaf attribute list
891 * or a leaf in a node attribute list.
892 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000893STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
895{
896 xfs_attr_leafblock_t *leaf;
897 xfs_attr_leaf_hdr_t *hdr;
898 xfs_inode_t *dp;
899 xfs_dabuf_t *bp;
900 int error;
901
902 dp = args->dp;
903 ASSERT(dp != NULL);
904 error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp,
905 XFS_ATTR_FORK);
906 if (error)
907 return(error);
908 ASSERT(bp != NULL);
909 leaf = bp->data;
910 memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
911 hdr = &leaf->hdr;
Nathan Scott89da0542006-03-17 17:28:40 +1100912 hdr->info.magic = cpu_to_be16(XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +1100913 hdr->firstused = cpu_to_be16(XFS_LBSIZE(dp->i_mount));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 if (!hdr->firstused) {
Nathan Scott918ae422006-03-17 17:28:54 +1100915 hdr->firstused = cpu_to_be16(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN);
917 }
918
Nathan Scott918ae422006-03-17 17:28:54 +1100919 hdr->freemap[0].base = cpu_to_be16(sizeof(xfs_attr_leaf_hdr_t));
920 hdr->freemap[0].size = cpu_to_be16(be16_to_cpu(hdr->firstused) -
921 sizeof(xfs_attr_leaf_hdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
923 xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
924
925 *bpp = bp;
926 return(0);
927}
928
929/*
930 * Split the leaf node, rebalance, then add the new entry.
931 */
932int
933xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
934 xfs_da_state_blk_t *newblk)
935{
936 xfs_dablk_t blkno;
937 int error;
938
939 /*
940 * Allocate space for a new leaf node.
941 */
942 ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC);
943 error = xfs_da_grow_inode(state->args, &blkno);
944 if (error)
945 return(error);
946 error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp);
947 if (error)
948 return(error);
949 newblk->blkno = blkno;
950 newblk->magic = XFS_ATTR_LEAF_MAGIC;
951
952 /*
953 * Rebalance the entries across the two leaves.
954 * NOTE: rebalance() currently depends on the 2nd block being empty.
955 */
956 xfs_attr_leaf_rebalance(state, oldblk, newblk);
957 error = xfs_da_blk_link(state, oldblk, newblk);
958 if (error)
959 return(error);
960
961 /*
962 * Save info on "old" attribute for "atomic rename" ops, leaf_add()
963 * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the
964 * "new" attrs info. Will need the "old" info to remove it later.
965 *
966 * Insert the "new" entry in the correct block.
967 */
968 if (state->inleaf)
969 error = xfs_attr_leaf_add(oldblk->bp, state->args);
970 else
971 error = xfs_attr_leaf_add(newblk->bp, state->args);
972
973 /*
974 * Update last hashval in each block since we added the name.
975 */
976 oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL);
977 newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL);
978 return(error);
979}
980
981/*
982 * Add a name to the leaf attribute list structure.
983 */
984int
985xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args)
986{
987 xfs_attr_leafblock_t *leaf;
988 xfs_attr_leaf_hdr_t *hdr;
989 xfs_attr_leaf_map_t *map;
990 int tablesize, entsize, sum, tmp, i;
991
992 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +1100993 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 ASSERT((args->index >= 0)
Nathan Scott918ae422006-03-17 17:28:54 +1100995 && (args->index <= be16_to_cpu(leaf->hdr.count)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 hdr = &leaf->hdr;
Nathan Scottaa82daa2005-11-02 10:33:33 +1100997 entsize = xfs_attr_leaf_newentsize(args->namelen, args->valuelen,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 args->trans->t_mountp->m_sb.sb_blocksize, NULL);
999
1000 /*
1001 * Search through freemap for first-fit on new name length.
1002 * (may need to figure in size of entry struct too)
1003 */
Nathan Scott918ae422006-03-17 17:28:54 +11001004 tablesize = (be16_to_cpu(hdr->count) + 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 * sizeof(xfs_attr_leaf_entry_t)
1006 + sizeof(xfs_attr_leaf_hdr_t);
1007 map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
1008 for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
Nathan Scott918ae422006-03-17 17:28:54 +11001009 if (tablesize > be16_to_cpu(hdr->firstused)) {
1010 sum += be16_to_cpu(map->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 continue;
1012 }
1013 if (!map->size)
1014 continue; /* no space in this map */
1015 tmp = entsize;
Nathan Scott918ae422006-03-17 17:28:54 +11001016 if (be16_to_cpu(map->base) < be16_to_cpu(hdr->firstused))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 tmp += sizeof(xfs_attr_leaf_entry_t);
Nathan Scott918ae422006-03-17 17:28:54 +11001018 if (be16_to_cpu(map->size) >= tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 tmp = xfs_attr_leaf_add_work(bp, args, i);
1020 return(tmp);
1021 }
Nathan Scott918ae422006-03-17 17:28:54 +11001022 sum += be16_to_cpu(map->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 }
1024
1025 /*
1026 * If there are no holes in the address space of the block,
1027 * and we don't have enough freespace, then compaction will do us
1028 * no good and we should just give up.
1029 */
1030 if (!hdr->holes && (sum < entsize))
1031 return(XFS_ERROR(ENOSPC));
1032
1033 /*
1034 * Compact the entries to coalesce free space.
1035 * This may change the hdr->count via dropping INCOMPLETE entries.
1036 */
1037 xfs_attr_leaf_compact(args->trans, bp);
1038
1039 /*
1040 * After compaction, the block is guaranteed to have only one
1041 * free region, in freemap[0]. If it is not big enough, give up.
1042 */
Nathan Scott918ae422006-03-17 17:28:54 +11001043 if (be16_to_cpu(hdr->freemap[0].size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 < (entsize + sizeof(xfs_attr_leaf_entry_t)))
1045 return(XFS_ERROR(ENOSPC));
1046
1047 return(xfs_attr_leaf_add_work(bp, args, 0));
1048}
1049
1050/*
1051 * Add a name to a leaf attribute list structure.
1052 */
1053STATIC int
1054xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex)
1055{
1056 xfs_attr_leafblock_t *leaf;
1057 xfs_attr_leaf_hdr_t *hdr;
1058 xfs_attr_leaf_entry_t *entry;
1059 xfs_attr_leaf_name_local_t *name_loc;
1060 xfs_attr_leaf_name_remote_t *name_rmt;
1061 xfs_attr_leaf_map_t *map;
1062 xfs_mount_t *mp;
1063 int tmp, i;
1064
1065 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001066 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 hdr = &leaf->hdr;
1068 ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE));
Nathan Scott918ae422006-03-17 17:28:54 +11001069 ASSERT((args->index >= 0) && (args->index <= be16_to_cpu(hdr->count)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
1071 /*
1072 * Force open some space in the entry array and fill it in.
1073 */
1074 entry = &leaf->entries[args->index];
Nathan Scott918ae422006-03-17 17:28:54 +11001075 if (args->index < be16_to_cpu(hdr->count)) {
1076 tmp = be16_to_cpu(hdr->count) - args->index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 tmp *= sizeof(xfs_attr_leaf_entry_t);
1078 memmove((char *)(entry+1), (char *)entry, tmp);
1079 xfs_da_log_buf(args->trans, bp,
1080 XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
1081 }
Nathan Scott918ae422006-03-17 17:28:54 +11001082 be16_add(&hdr->count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
1084 /*
1085 * Allocate space for the new string (at the end of the run).
1086 */
1087 map = &hdr->freemap[mapindex];
1088 mp = args->trans->t_mountp;
Nathan Scott918ae422006-03-17 17:28:54 +11001089 ASSERT(be16_to_cpu(map->base) < XFS_LBSIZE(mp));
1090 ASSERT((be16_to_cpu(map->base) & 0x3) == 0);
1091 ASSERT(be16_to_cpu(map->size) >=
Nathan Scottaa82daa2005-11-02 10:33:33 +11001092 xfs_attr_leaf_newentsize(args->namelen, args->valuelen,
1093 mp->m_sb.sb_blocksize, NULL));
Nathan Scott918ae422006-03-17 17:28:54 +11001094 ASSERT(be16_to_cpu(map->size) < XFS_LBSIZE(mp));
1095 ASSERT((be16_to_cpu(map->size) & 0x3) == 0);
1096 be16_add(&map->size,
Nathan Scottaa82daa2005-11-02 10:33:33 +11001097 -xfs_attr_leaf_newentsize(args->namelen, args->valuelen,
1098 mp->m_sb.sb_blocksize, &tmp));
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001099 entry->nameidx = cpu_to_be16(be16_to_cpu(map->base) +
1100 be16_to_cpu(map->size));
1101 entry->hashval = cpu_to_be32(args->hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
1103 entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
1104 ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
1105 if (args->rename) {
1106 entry->flags |= XFS_ATTR_INCOMPLETE;
1107 if ((args->blkno2 == args->blkno) &&
1108 (args->index2 <= args->index)) {
1109 args->index2++;
1110 }
1111 }
1112 xfs_da_log_buf(args->trans, bp,
1113 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001114 ASSERT((args->index == 0) ||
1115 (be32_to_cpu(entry->hashval) >= be32_to_cpu((entry-1)->hashval)));
Nathan Scott918ae422006-03-17 17:28:54 +11001116 ASSERT((args->index == be16_to_cpu(hdr->count)-1) ||
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001117 (be32_to_cpu(entry->hashval) <= be32_to_cpu((entry+1)->hashval)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
1119 /*
1120 * Copy the attribute name and value into the new space.
1121 *
1122 * For "remote" attribute values, simply note that we need to
1123 * allocate space for the "remote" value. We can't actually
1124 * allocate the extents in this transaction, and we can't decide
1125 * which blocks they should be as we might allocate more blocks
1126 * as part of this transaction (a split operation for example).
1127 */
1128 if (entry->flags & XFS_ATTR_LOCAL) {
1129 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
1130 name_loc->namelen = args->namelen;
Nathan Scott053b5752006-03-17 17:29:09 +11001131 name_loc->valuelen = cpu_to_be16(args->valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 memcpy((char *)name_loc->nameval, args->name, args->namelen);
1133 memcpy((char *)&name_loc->nameval[args->namelen], args->value,
Nathan Scott053b5752006-03-17 17:29:09 +11001134 be16_to_cpu(name_loc->valuelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 } else {
1136 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
1137 name_rmt->namelen = args->namelen;
1138 memcpy((char *)name_rmt->name, args->name, args->namelen);
1139 entry->flags |= XFS_ATTR_INCOMPLETE;
1140 /* just in case */
1141 name_rmt->valuelen = 0;
1142 name_rmt->valueblk = 0;
1143 args->rmtblkno = 1;
1144 args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1145 }
1146 xfs_da_log_buf(args->trans, bp,
1147 XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
1148 xfs_attr_leaf_entsize(leaf, args->index)));
1149
1150 /*
1151 * Update the control info for this leaf node
1152 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001153 if (be16_to_cpu(entry->nameidx) < be16_to_cpu(hdr->firstused)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 /* both on-disk, don't endian-flip twice */
1155 hdr->firstused = entry->nameidx;
1156 }
Nathan Scott918ae422006-03-17 17:28:54 +11001157 ASSERT(be16_to_cpu(hdr->firstused) >=
1158 ((be16_to_cpu(hdr->count) * sizeof(*entry)) + sizeof(*hdr)));
1159 tmp = (be16_to_cpu(hdr->count)-1) * sizeof(xfs_attr_leaf_entry_t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 + sizeof(xfs_attr_leaf_hdr_t);
1161 map = &hdr->freemap[0];
1162 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
Nathan Scott918ae422006-03-17 17:28:54 +11001163 if (be16_to_cpu(map->base) == tmp) {
1164 be16_add(&map->base, sizeof(xfs_attr_leaf_entry_t));
1165 be16_add(&map->size,
1166 -((int)sizeof(xfs_attr_leaf_entry_t)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 }
1168 }
Nathan Scott918ae422006-03-17 17:28:54 +11001169 be16_add(&hdr->usedbytes, xfs_attr_leaf_entsize(leaf, args->index));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 xfs_da_log_buf(args->trans, bp,
1171 XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1172 return(0);
1173}
1174
1175/*
1176 * Garbage collect a leaf attribute list block by copying it to a new buffer.
1177 */
1178STATIC void
1179xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp)
1180{
1181 xfs_attr_leafblock_t *leaf_s, *leaf_d;
1182 xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
1183 xfs_mount_t *mp;
1184 char *tmpbuffer;
1185
1186 mp = trans->t_mountp;
1187 tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP);
1188 ASSERT(tmpbuffer != NULL);
1189 memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp));
1190 memset(bp->data, 0, XFS_LBSIZE(mp));
1191
1192 /*
1193 * Copy basic information
1194 */
1195 leaf_s = (xfs_attr_leafblock_t *)tmpbuffer;
1196 leaf_d = bp->data;
1197 hdr_s = &leaf_s->hdr;
1198 hdr_d = &leaf_d->hdr;
1199 hdr_d->info = hdr_s->info; /* struct copy */
Nathan Scott918ae422006-03-17 17:28:54 +11001200 hdr_d->firstused = cpu_to_be16(XFS_LBSIZE(mp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 /* handle truncation gracefully */
1202 if (!hdr_d->firstused) {
Nathan Scott918ae422006-03-17 17:28:54 +11001203 hdr_d->firstused = cpu_to_be16(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN);
1205 }
1206 hdr_d->usedbytes = 0;
1207 hdr_d->count = 0;
1208 hdr_d->holes = 0;
Nathan Scott918ae422006-03-17 17:28:54 +11001209 hdr_d->freemap[0].base = cpu_to_be16(sizeof(xfs_attr_leaf_hdr_t));
1210 hdr_d->freemap[0].size = cpu_to_be16(be16_to_cpu(hdr_d->firstused) -
1211 sizeof(xfs_attr_leaf_hdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
1213 /*
1214 * Copy all entry's in the same (sorted) order,
1215 * but allocate name/value pairs packed and in sequence.
1216 */
1217 xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0,
Nathan Scott918ae422006-03-17 17:28:54 +11001218 be16_to_cpu(hdr_s->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1);
1220
1221 kmem_free(tmpbuffer, XFS_LBSIZE(mp));
1222}
1223
1224/*
1225 * Redistribute the attribute list entries between two leaf nodes,
1226 * taking into account the size of the new entry.
1227 *
1228 * NOTE: if new block is empty, then it will get the upper half of the
1229 * old block. At present, all (one) callers pass in an empty second block.
1230 *
1231 * This code adjusts the args->index/blkno and args->index2/blkno2 fields
1232 * to match what it is doing in splitting the attribute leaf block. Those
1233 * values are used in "atomic rename" operations on attributes. Note that
1234 * the "new" and "old" values can end up in different blocks.
1235 */
1236STATIC void
1237xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
1238 xfs_da_state_blk_t *blk2)
1239{
1240 xfs_da_args_t *args;
1241 xfs_da_state_blk_t *tmp_blk;
1242 xfs_attr_leafblock_t *leaf1, *leaf2;
1243 xfs_attr_leaf_hdr_t *hdr1, *hdr2;
1244 int count, totallen, max, space, swap;
1245
1246 /*
1247 * Set up environment.
1248 */
1249 ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
1250 ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
1251 leaf1 = blk1->bp->data;
1252 leaf2 = blk2->bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001253 ASSERT(be16_to_cpu(leaf1->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
1254 ASSERT(be16_to_cpu(leaf2->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 args = state->args;
1256
1257 /*
1258 * Check ordering of blocks, reverse if it makes things simpler.
1259 *
1260 * NOTE: Given that all (current) callers pass in an empty
1261 * second block, this code should never set "swap".
1262 */
1263 swap = 0;
1264 if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) {
1265 tmp_blk = blk1;
1266 blk1 = blk2;
1267 blk2 = tmp_blk;
1268 leaf1 = blk1->bp->data;
1269 leaf2 = blk2->bp->data;
1270 swap = 1;
1271 }
1272 hdr1 = &leaf1->hdr;
1273 hdr2 = &leaf2->hdr;
1274
1275 /*
1276 * Examine entries until we reduce the absolute difference in
1277 * byte usage between the two blocks to a minimum. Then get
1278 * the direction to copy and the number of elements to move.
1279 *
1280 * "inleaf" is true if the new entry should be inserted into blk1.
1281 * If "swap" is also true, then reverse the sense of "inleaf".
1282 */
1283 state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2,
1284 &count, &totallen);
1285 if (swap)
1286 state->inleaf = !state->inleaf;
1287
1288 /*
1289 * Move any entries required from leaf to leaf:
1290 */
Nathan Scott918ae422006-03-17 17:28:54 +11001291 if (count < be16_to_cpu(hdr1->count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 /*
1293 * Figure the total bytes to be added to the destination leaf.
1294 */
1295 /* number entries being moved */
Nathan Scott918ae422006-03-17 17:28:54 +11001296 count = be16_to_cpu(hdr1->count) - count;
1297 space = be16_to_cpu(hdr1->usedbytes) - totallen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 space += count * sizeof(xfs_attr_leaf_entry_t);
1299
1300 /*
1301 * leaf2 is the destination, compact it if it looks tight.
1302 */
Nathan Scott918ae422006-03-17 17:28:54 +11001303 max = be16_to_cpu(hdr2->firstused)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 - sizeof(xfs_attr_leaf_hdr_t);
Nathan Scott918ae422006-03-17 17:28:54 +11001305 max -= be16_to_cpu(hdr2->count) * sizeof(xfs_attr_leaf_entry_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 if (space > max) {
1307 xfs_attr_leaf_compact(args->trans, blk2->bp);
1308 }
1309
1310 /*
1311 * Move high entries from leaf1 to low end of leaf2.
1312 */
Nathan Scott918ae422006-03-17 17:28:54 +11001313 xfs_attr_leaf_moveents(leaf1, be16_to_cpu(hdr1->count) - count,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 leaf2, 0, count, state->mp);
1315
1316 xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
1317 xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
Nathan Scott918ae422006-03-17 17:28:54 +11001318 } else if (count > be16_to_cpu(hdr1->count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 /*
1320 * I assert that since all callers pass in an empty
1321 * second buffer, this code should never execute.
1322 */
1323
1324 /*
1325 * Figure the total bytes to be added to the destination leaf.
1326 */
1327 /* number entries being moved */
Nathan Scott918ae422006-03-17 17:28:54 +11001328 count -= be16_to_cpu(hdr1->count);
1329 space = totallen - be16_to_cpu(hdr1->usedbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 space += count * sizeof(xfs_attr_leaf_entry_t);
1331
1332 /*
1333 * leaf1 is the destination, compact it if it looks tight.
1334 */
Nathan Scott918ae422006-03-17 17:28:54 +11001335 max = be16_to_cpu(hdr1->firstused)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 - sizeof(xfs_attr_leaf_hdr_t);
Nathan Scott918ae422006-03-17 17:28:54 +11001337 max -= be16_to_cpu(hdr1->count) * sizeof(xfs_attr_leaf_entry_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 if (space > max) {
1339 xfs_attr_leaf_compact(args->trans, blk1->bp);
1340 }
1341
1342 /*
1343 * Move low entries from leaf2 to high end of leaf1.
1344 */
1345 xfs_attr_leaf_moveents(leaf2, 0, leaf1,
Nathan Scott918ae422006-03-17 17:28:54 +11001346 be16_to_cpu(hdr1->count), count, state->mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347
1348 xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
1349 xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
1350 }
1351
1352 /*
1353 * Copy out last hashval in each block for B-tree code.
1354 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001355 blk1->hashval = be32_to_cpu(
1356 leaf1->entries[be16_to_cpu(leaf1->hdr.count)-1].hashval);
1357 blk2->hashval = be32_to_cpu(
1358 leaf2->entries[be16_to_cpu(leaf2->hdr.count)-1].hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360 /*
1361 * Adjust the expected index for insertion.
1362 * NOTE: this code depends on the (current) situation that the
1363 * second block was originally empty.
1364 *
1365 * If the insertion point moved to the 2nd block, we must adjust
1366 * the index. We must also track the entry just following the
1367 * new entry for use in an "atomic rename" operation, that entry
1368 * is always the "old" entry and the "new" entry is what we are
1369 * inserting. The index/blkno fields refer to the "old" entry,
1370 * while the index2/blkno2 fields refer to the "new" entry.
1371 */
Nathan Scott918ae422006-03-17 17:28:54 +11001372 if (blk1->index > be16_to_cpu(leaf1->hdr.count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 ASSERT(state->inleaf == 0);
Nathan Scott918ae422006-03-17 17:28:54 +11001374 blk2->index = blk1->index - be16_to_cpu(leaf1->hdr.count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 args->index = args->index2 = blk2->index;
1376 args->blkno = args->blkno2 = blk2->blkno;
Nathan Scott918ae422006-03-17 17:28:54 +11001377 } else if (blk1->index == be16_to_cpu(leaf1->hdr.count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 if (state->inleaf) {
1379 args->index = blk1->index;
1380 args->blkno = blk1->blkno;
1381 args->index2 = 0;
1382 args->blkno2 = blk2->blkno;
1383 } else {
1384 blk2->index = blk1->index
Nathan Scott918ae422006-03-17 17:28:54 +11001385 - be16_to_cpu(leaf1->hdr.count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 args->index = args->index2 = blk2->index;
1387 args->blkno = args->blkno2 = blk2->blkno;
1388 }
1389 } else {
1390 ASSERT(state->inleaf == 1);
1391 args->index = args->index2 = blk1->index;
1392 args->blkno = args->blkno2 = blk1->blkno;
1393 }
1394}
1395
1396/*
1397 * Examine entries until we reduce the absolute difference in
1398 * byte usage between the two blocks to a minimum.
1399 * GROT: Is this really necessary? With other than a 512 byte blocksize,
1400 * GROT: there will always be enough room in either block for a new entry.
1401 * GROT: Do a double-split for this case?
1402 */
1403STATIC int
1404xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
1405 xfs_da_state_blk_t *blk1,
1406 xfs_da_state_blk_t *blk2,
1407 int *countarg, int *usedbytesarg)
1408{
1409 xfs_attr_leafblock_t *leaf1, *leaf2;
1410 xfs_attr_leaf_hdr_t *hdr1, *hdr2;
1411 xfs_attr_leaf_entry_t *entry;
1412 int count, max, index, totallen, half;
1413 int lastdelta, foundit, tmp;
1414
1415 /*
1416 * Set up environment.
1417 */
1418 leaf1 = blk1->bp->data;
1419 leaf2 = blk2->bp->data;
1420 hdr1 = &leaf1->hdr;
1421 hdr2 = &leaf2->hdr;
1422 foundit = 0;
1423 totallen = 0;
1424
1425 /*
1426 * Examine entries until we reduce the absolute difference in
1427 * byte usage between the two blocks to a minimum.
1428 */
Nathan Scott918ae422006-03-17 17:28:54 +11001429 max = be16_to_cpu(hdr1->count) + be16_to_cpu(hdr2->count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 half = (max+1) * sizeof(*entry);
Nathan Scott918ae422006-03-17 17:28:54 +11001431 half += be16_to_cpu(hdr1->usedbytes) +
1432 be16_to_cpu(hdr2->usedbytes) +
1433 xfs_attr_leaf_newentsize(
1434 state->args->namelen,
1435 state->args->valuelen,
1436 state->blocksize, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 half /= 2;
1438 lastdelta = state->blocksize;
1439 entry = &leaf1->entries[0];
1440 for (count = index = 0; count < max; entry++, index++, count++) {
1441
1442#define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A))
1443 /*
1444 * The new entry is in the first block, account for it.
1445 */
1446 if (count == blk1->index) {
1447 tmp = totallen + sizeof(*entry) +
Nathan Scottaa82daa2005-11-02 10:33:33 +11001448 xfs_attr_leaf_newentsize(
1449 state->args->namelen,
1450 state->args->valuelen,
1451 state->blocksize, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 if (XFS_ATTR_ABS(half - tmp) > lastdelta)
1453 break;
1454 lastdelta = XFS_ATTR_ABS(half - tmp);
1455 totallen = tmp;
1456 foundit = 1;
1457 }
1458
1459 /*
1460 * Wrap around into the second block if necessary.
1461 */
Nathan Scott918ae422006-03-17 17:28:54 +11001462 if (count == be16_to_cpu(hdr1->count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 leaf1 = leaf2;
1464 entry = &leaf1->entries[0];
1465 index = 0;
1466 }
1467
1468 /*
1469 * Figure out if next leaf entry would be too much.
1470 */
1471 tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1,
1472 index);
1473 if (XFS_ATTR_ABS(half - tmp) > lastdelta)
1474 break;
1475 lastdelta = XFS_ATTR_ABS(half - tmp);
1476 totallen = tmp;
1477#undef XFS_ATTR_ABS
1478 }
1479
1480 /*
1481 * Calculate the number of usedbytes that will end up in lower block.
1482 * If new entry not in lower block, fix up the count.
1483 */
1484 totallen -= count * sizeof(*entry);
1485 if (foundit) {
1486 totallen -= sizeof(*entry) +
Nathan Scottaa82daa2005-11-02 10:33:33 +11001487 xfs_attr_leaf_newentsize(
1488 state->args->namelen,
1489 state->args->valuelen,
1490 state->blocksize, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 }
1492
1493 *countarg = count;
1494 *usedbytesarg = totallen;
1495 return(foundit);
1496}
1497
1498/*========================================================================
1499 * Routines used for shrinking the Btree.
1500 *========================================================================*/
1501
1502/*
1503 * Check a leaf block and its neighbors to see if the block should be
1504 * collapsed into one or the other neighbor. Always keep the block
1505 * with the smaller block number.
1506 * If the current block is over 50% full, don't try to join it, return 0.
1507 * If the block is empty, fill in the state structure and return 2.
1508 * If it can be collapsed, fill in the state structure and return 1.
1509 * If nothing can be done, return 0.
1510 *
1511 * GROT: allow for INCOMPLETE entries in calculation.
1512 */
1513int
1514xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
1515{
1516 xfs_attr_leafblock_t *leaf;
1517 xfs_da_state_blk_t *blk;
1518 xfs_da_blkinfo_t *info;
1519 int count, bytes, forward, error, retval, i;
1520 xfs_dablk_t blkno;
1521 xfs_dabuf_t *bp;
1522
1523 /*
1524 * Check for the degenerate case of the block being over 50% full.
1525 * If so, it's not worth even looking to see if we might be able
1526 * to coalesce with a sibling.
1527 */
1528 blk = &state->path.blk[ state->path.active-1 ];
1529 info = blk->bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001530 ASSERT(be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 leaf = (xfs_attr_leafblock_t *)info;
Nathan Scott918ae422006-03-17 17:28:54 +11001532 count = be16_to_cpu(leaf->hdr.count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 bytes = sizeof(xfs_attr_leaf_hdr_t) +
1534 count * sizeof(xfs_attr_leaf_entry_t) +
Nathan Scott918ae422006-03-17 17:28:54 +11001535 be16_to_cpu(leaf->hdr.usedbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 if (bytes > (state->blocksize >> 1)) {
1537 *action = 0; /* blk over 50%, don't try to join */
1538 return(0);
1539 }
1540
1541 /*
1542 * Check for the degenerate case of the block being empty.
1543 * If the block is empty, we'll simply delete it, no need to
Nathan Scottc41564b2006-03-29 08:55:14 +10001544 * coalesce it with a sibling block. We choose (arbitrarily)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 * to merge with the forward block unless it is NULL.
1546 */
1547 if (count == 0) {
1548 /*
1549 * Make altpath point to the block we want to keep and
1550 * path point to the block we want to drop (this one).
1551 */
Nathan Scott89da0542006-03-17 17:28:40 +11001552 forward = (info->forw != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 memcpy(&state->altpath, &state->path, sizeof(state->path));
1554 error = xfs_da_path_shift(state, &state->altpath, forward,
1555 0, &retval);
1556 if (error)
1557 return(error);
1558 if (retval) {
1559 *action = 0;
1560 } else {
1561 *action = 2;
1562 }
1563 return(0);
1564 }
1565
1566 /*
1567 * Examine each sibling block to see if we can coalesce with
1568 * at least 25% free space to spare. We need to figure out
1569 * whether to merge with the forward or the backward block.
1570 * We prefer coalescing with the lower numbered sibling so as
1571 * to shrink an attribute list over time.
1572 */
1573 /* start with smaller blk num */
Nathan Scott89da0542006-03-17 17:28:40 +11001574 forward = (be32_to_cpu(info->forw) < be32_to_cpu(info->back));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 for (i = 0; i < 2; forward = !forward, i++) {
1576 if (forward)
Nathan Scott89da0542006-03-17 17:28:40 +11001577 blkno = be32_to_cpu(info->forw);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 else
Nathan Scott89da0542006-03-17 17:28:40 +11001579 blkno = be32_to_cpu(info->back);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 if (blkno == 0)
1581 continue;
1582 error = xfs_da_read_buf(state->args->trans, state->args->dp,
1583 blkno, -1, &bp, XFS_ATTR_FORK);
1584 if (error)
1585 return(error);
1586 ASSERT(bp != NULL);
1587
1588 leaf = (xfs_attr_leafblock_t *)info;
Nathan Scott918ae422006-03-17 17:28:54 +11001589 count = be16_to_cpu(leaf->hdr.count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 bytes = state->blocksize - (state->blocksize>>2);
Nathan Scott918ae422006-03-17 17:28:54 +11001591 bytes -= be16_to_cpu(leaf->hdr.usedbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001593 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11001594 count += be16_to_cpu(leaf->hdr.count);
1595 bytes -= be16_to_cpu(leaf->hdr.usedbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 bytes -= count * sizeof(xfs_attr_leaf_entry_t);
1597 bytes -= sizeof(xfs_attr_leaf_hdr_t);
1598 xfs_da_brelse(state->args->trans, bp);
1599 if (bytes >= 0)
1600 break; /* fits with at least 25% to spare */
1601 }
1602 if (i >= 2) {
1603 *action = 0;
1604 return(0);
1605 }
1606
1607 /*
1608 * Make altpath point to the block we want to keep (the lower
1609 * numbered block) and path point to the block we want to drop.
1610 */
1611 memcpy(&state->altpath, &state->path, sizeof(state->path));
1612 if (blkno < blk->blkno) {
1613 error = xfs_da_path_shift(state, &state->altpath, forward,
1614 0, &retval);
1615 } else {
1616 error = xfs_da_path_shift(state, &state->path, forward,
1617 0, &retval);
1618 }
1619 if (error)
1620 return(error);
1621 if (retval) {
1622 *action = 0;
1623 } else {
1624 *action = 1;
1625 }
1626 return(0);
1627}
1628
1629/*
1630 * Remove a name from the leaf attribute list structure.
1631 *
1632 * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
1633 * If two leaves are 37% full, when combined they will leave 25% free.
1634 */
1635int
1636xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args)
1637{
1638 xfs_attr_leafblock_t *leaf;
1639 xfs_attr_leaf_hdr_t *hdr;
1640 xfs_attr_leaf_map_t *map;
1641 xfs_attr_leaf_entry_t *entry;
1642 int before, after, smallest, entsize;
1643 int tablesize, tmp, i;
1644 xfs_mount_t *mp;
1645
1646 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001647 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 hdr = &leaf->hdr;
1649 mp = args->trans->t_mountp;
Nathan Scott918ae422006-03-17 17:28:54 +11001650 ASSERT((be16_to_cpu(hdr->count) > 0)
1651 && (be16_to_cpu(hdr->count) < (XFS_LBSIZE(mp)/8)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 ASSERT((args->index >= 0)
Nathan Scott918ae422006-03-17 17:28:54 +11001653 && (args->index < be16_to_cpu(hdr->count)));
1654 ASSERT(be16_to_cpu(hdr->firstused) >=
1655 ((be16_to_cpu(hdr->count) * sizeof(*entry)) + sizeof(*hdr)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 entry = &leaf->entries[args->index];
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001657 ASSERT(be16_to_cpu(entry->nameidx) >= be16_to_cpu(hdr->firstused));
1658 ASSERT(be16_to_cpu(entry->nameidx) < XFS_LBSIZE(mp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659
1660 /*
1661 * Scan through free region table:
1662 * check for adjacency of free'd entry with an existing one,
1663 * find smallest free region in case we need to replace it,
1664 * adjust any map that borders the entry table,
1665 */
Nathan Scott918ae422006-03-17 17:28:54 +11001666 tablesize = be16_to_cpu(hdr->count) * sizeof(xfs_attr_leaf_entry_t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 + sizeof(xfs_attr_leaf_hdr_t);
1668 map = &hdr->freemap[0];
Nathan Scott918ae422006-03-17 17:28:54 +11001669 tmp = be16_to_cpu(map->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 before = after = -1;
1671 smallest = XFS_ATTR_LEAF_MAPSIZE - 1;
1672 entsize = xfs_attr_leaf_entsize(leaf, args->index);
1673 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
Nathan Scott918ae422006-03-17 17:28:54 +11001674 ASSERT(be16_to_cpu(map->base) < XFS_LBSIZE(mp));
1675 ASSERT(be16_to_cpu(map->size) < XFS_LBSIZE(mp));
1676 if (be16_to_cpu(map->base) == tablesize) {
1677 be16_add(&map->base,
1678 -((int)sizeof(xfs_attr_leaf_entry_t)));
1679 be16_add(&map->size, sizeof(xfs_attr_leaf_entry_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 }
1681
Nathan Scott918ae422006-03-17 17:28:54 +11001682 if ((be16_to_cpu(map->base) + be16_to_cpu(map->size))
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001683 == be16_to_cpu(entry->nameidx)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 before = i;
Nathan Scott918ae422006-03-17 17:28:54 +11001685 } else if (be16_to_cpu(map->base)
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001686 == (be16_to_cpu(entry->nameidx) + entsize)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 after = i;
Nathan Scott918ae422006-03-17 17:28:54 +11001688 } else if (be16_to_cpu(map->size) < tmp) {
1689 tmp = be16_to_cpu(map->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 smallest = i;
1691 }
1692 }
1693
1694 /*
1695 * Coalesce adjacent freemap regions,
1696 * or replace the smallest region.
1697 */
1698 if ((before >= 0) || (after >= 0)) {
1699 if ((before >= 0) && (after >= 0)) {
1700 map = &hdr->freemap[before];
Nathan Scott918ae422006-03-17 17:28:54 +11001701 be16_add(&map->size, entsize);
1702 be16_add(&map->size,
1703 be16_to_cpu(hdr->freemap[after].size));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 hdr->freemap[after].base = 0;
1705 hdr->freemap[after].size = 0;
1706 } else if (before >= 0) {
1707 map = &hdr->freemap[before];
Nathan Scott918ae422006-03-17 17:28:54 +11001708 be16_add(&map->size, entsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 } else {
1710 map = &hdr->freemap[after];
1711 /* both on-disk, don't endian flip twice */
1712 map->base = entry->nameidx;
Nathan Scott918ae422006-03-17 17:28:54 +11001713 be16_add(&map->size, entsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 }
1715 } else {
1716 /*
1717 * Replace smallest region (if it is smaller than free'd entry)
1718 */
1719 map = &hdr->freemap[smallest];
Nathan Scott918ae422006-03-17 17:28:54 +11001720 if (be16_to_cpu(map->size) < entsize) {
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001721 map->base = cpu_to_be16(be16_to_cpu(entry->nameidx));
Nathan Scott918ae422006-03-17 17:28:54 +11001722 map->size = cpu_to_be16(entsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 }
1724 }
1725
1726 /*
1727 * Did we remove the first entry?
1728 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001729 if (be16_to_cpu(entry->nameidx) == be16_to_cpu(hdr->firstused))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 smallest = 1;
1731 else
1732 smallest = 0;
1733
1734 /*
1735 * Compress the remaining entries and zero out the removed stuff.
1736 */
1737 memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize);
Nathan Scott918ae422006-03-17 17:28:54 +11001738 be16_add(&hdr->usedbytes, -entsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 xfs_da_log_buf(args->trans, bp,
1740 XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
1741 entsize));
1742
Nathan Scott918ae422006-03-17 17:28:54 +11001743 tmp = (be16_to_cpu(hdr->count) - args->index)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 * sizeof(xfs_attr_leaf_entry_t);
1745 memmove((char *)entry, (char *)(entry+1), tmp);
Nathan Scott918ae422006-03-17 17:28:54 +11001746 be16_add(&hdr->count, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 xfs_da_log_buf(args->trans, bp,
1748 XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
Nathan Scott918ae422006-03-17 17:28:54 +11001749 entry = &leaf->entries[be16_to_cpu(hdr->count)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t));
1751
1752 /*
1753 * If we removed the first entry, re-find the first used byte
1754 * in the name area. Note that if the entry was the "firstused",
1755 * then we don't have a "hole" in our block resulting from
1756 * removing the name.
1757 */
1758 if (smallest) {
1759 tmp = XFS_LBSIZE(mp);
1760 entry = &leaf->entries[0];
Nathan Scott918ae422006-03-17 17:28:54 +11001761 for (i = be16_to_cpu(hdr->count)-1; i >= 0; entry++, i--) {
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001762 ASSERT(be16_to_cpu(entry->nameidx) >=
1763 be16_to_cpu(hdr->firstused));
1764 ASSERT(be16_to_cpu(entry->nameidx) < XFS_LBSIZE(mp));
1765
1766 if (be16_to_cpu(entry->nameidx) < tmp)
1767 tmp = be16_to_cpu(entry->nameidx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 }
Nathan Scott918ae422006-03-17 17:28:54 +11001769 hdr->firstused = cpu_to_be16(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 if (!hdr->firstused) {
Nathan Scott918ae422006-03-17 17:28:54 +11001771 hdr->firstused = cpu_to_be16(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 tmp - XFS_ATTR_LEAF_NAME_ALIGN);
1773 }
1774 } else {
1775 hdr->holes = 1; /* mark as needing compaction */
1776 }
1777 xfs_da_log_buf(args->trans, bp,
1778 XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1779
1780 /*
1781 * Check if leaf is less than 50% full, caller may want to
1782 * "join" the leaf with a sibling if so.
1783 */
1784 tmp = sizeof(xfs_attr_leaf_hdr_t);
Nathan Scott918ae422006-03-17 17:28:54 +11001785 tmp += be16_to_cpu(leaf->hdr.count) * sizeof(xfs_attr_leaf_entry_t);
1786 tmp += be16_to_cpu(leaf->hdr.usedbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */
1788}
1789
1790/*
1791 * Move all the attribute list entries from drop_leaf into save_leaf.
1792 */
1793void
1794xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
1795 xfs_da_state_blk_t *save_blk)
1796{
1797 xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
1798 xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
1799 xfs_mount_t *mp;
1800 char *tmpbuffer;
1801
1802 /*
1803 * Set up environment.
1804 */
1805 mp = state->mp;
1806 ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC);
1807 ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC);
1808 drop_leaf = drop_blk->bp->data;
1809 save_leaf = save_blk->bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001810 ASSERT(be16_to_cpu(drop_leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
1811 ASSERT(be16_to_cpu(save_leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 drop_hdr = &drop_leaf->hdr;
1813 save_hdr = &save_leaf->hdr;
1814
1815 /*
1816 * Save last hashval from dying block for later Btree fixup.
1817 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001818 drop_blk->hashval = be32_to_cpu(
1819 drop_leaf->entries[be16_to_cpu(drop_leaf->hdr.count)-1].hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820
1821 /*
1822 * Check if we need a temp buffer, or can we do it in place.
1823 * Note that we don't check "leaf" for holes because we will
1824 * always be dropping it, toosmall() decided that for us already.
1825 */
1826 if (save_hdr->holes == 0) {
1827 /*
1828 * dest leaf has no holes, so we add there. May need
1829 * to make some room in the entry array.
1830 */
1831 if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
1832 xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0,
Nathan Scott918ae422006-03-17 17:28:54 +11001833 be16_to_cpu(drop_hdr->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 } else {
1835 xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf,
Nathan Scott918ae422006-03-17 17:28:54 +11001836 be16_to_cpu(save_hdr->count),
1837 be16_to_cpu(drop_hdr->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 }
1839 } else {
1840 /*
1841 * Destination has holes, so we make a temporary copy
1842 * of the leaf and add them both to that.
1843 */
1844 tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
1845 ASSERT(tmpbuffer != NULL);
1846 memset(tmpbuffer, 0, state->blocksize);
1847 tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer;
1848 tmp_hdr = &tmp_leaf->hdr;
1849 tmp_hdr->info = save_hdr->info; /* struct copy */
1850 tmp_hdr->count = 0;
Nathan Scott918ae422006-03-17 17:28:54 +11001851 tmp_hdr->firstused = cpu_to_be16(state->blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 if (!tmp_hdr->firstused) {
Nathan Scott918ae422006-03-17 17:28:54 +11001853 tmp_hdr->firstused = cpu_to_be16(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN);
1855 }
1856 tmp_hdr->usedbytes = 0;
1857 if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
1858 xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
Nathan Scott918ae422006-03-17 17:28:54 +11001859 be16_to_cpu(drop_hdr->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf,
Nathan Scott918ae422006-03-17 17:28:54 +11001861 be16_to_cpu(tmp_leaf->hdr.count),
1862 be16_to_cpu(save_hdr->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 } else {
1864 xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
Nathan Scott918ae422006-03-17 17:28:54 +11001865 be16_to_cpu(save_hdr->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf,
Nathan Scott918ae422006-03-17 17:28:54 +11001867 be16_to_cpu(tmp_leaf->hdr.count),
1868 be16_to_cpu(drop_hdr->count), mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 }
1870 memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize);
1871 kmem_free(tmpbuffer, state->blocksize);
1872 }
1873
1874 xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
1875 state->blocksize - 1);
1876
1877 /*
1878 * Copy out last hashval in each block for B-tree code.
1879 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001880 save_blk->hashval = be32_to_cpu(
1881 save_leaf->entries[be16_to_cpu(save_leaf->hdr.count)-1].hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882}
1883
1884/*========================================================================
1885 * Routines used for finding things in the Btree.
1886 *========================================================================*/
1887
1888/*
1889 * Look up a name in a leaf attribute list structure.
1890 * This is the internal routine, it uses the caller's buffer.
1891 *
1892 * Note that duplicate keys are allowed, but only check within the
1893 * current leaf node. The Btree code must check in adjacent leaf nodes.
1894 *
1895 * Return in args->index the index into the entry[] array of either
1896 * the found entry, or where the entry should have been (insert before
1897 * that entry).
1898 *
1899 * Don't change the args->value unless we find the attribute.
1900 */
1901int
1902xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args)
1903{
1904 xfs_attr_leafblock_t *leaf;
1905 xfs_attr_leaf_entry_t *entry;
1906 xfs_attr_leaf_name_local_t *name_loc;
1907 xfs_attr_leaf_name_remote_t *name_rmt;
1908 int probe, span;
1909 xfs_dahash_t hashval;
1910
1911 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11001912 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11001913 ASSERT(be16_to_cpu(leaf->hdr.count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 < (XFS_LBSIZE(args->dp->i_mount)/8));
1915
1916 /*
1917 * Binary search. (note: small blocks will skip this loop)
1918 */
1919 hashval = args->hashval;
Nathan Scott918ae422006-03-17 17:28:54 +11001920 probe = span = be16_to_cpu(leaf->hdr.count) / 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 for (entry = &leaf->entries[probe]; span > 4;
1922 entry = &leaf->entries[probe]) {
1923 span /= 2;
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001924 if (be32_to_cpu(entry->hashval) < hashval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 probe += span;
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001926 else if (be32_to_cpu(entry->hashval) > hashval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 probe -= span;
1928 else
1929 break;
1930 }
1931 ASSERT((probe >= 0) &&
1932 (!leaf->hdr.count
Nathan Scott918ae422006-03-17 17:28:54 +11001933 || (probe < be16_to_cpu(leaf->hdr.count))));
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001934 ASSERT((span <= 4) || (be32_to_cpu(entry->hashval) == hashval));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935
1936 /*
1937 * Since we may have duplicate hashval's, find the first matching
1938 * hashval in the leaf.
1939 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001940 while ((probe > 0) && (be32_to_cpu(entry->hashval) >= hashval)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 entry--;
1942 probe--;
1943 }
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001944 while ((probe < be16_to_cpu(leaf->hdr.count)) &&
1945 (be32_to_cpu(entry->hashval) < hashval)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 entry++;
1947 probe++;
1948 }
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001949 if ((probe == be16_to_cpu(leaf->hdr.count)) ||
1950 (be32_to_cpu(entry->hashval) != hashval)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 args->index = probe;
1952 return(XFS_ERROR(ENOATTR));
1953 }
1954
1955 /*
1956 * Duplicate keys may be present, so search all of them for a match.
1957 */
Nathan Scott6b19f2d2006-03-17 17:29:02 +11001958 for ( ; (probe < be16_to_cpu(leaf->hdr.count)) &&
1959 (be32_to_cpu(entry->hashval) == hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 entry++, probe++) {
1961/*
1962 * GROT: Add code to remove incomplete entries.
1963 */
1964 /*
1965 * If we are looking for INCOMPLETE entries, show only those.
1966 * If we are looking for complete entries, show only those.
1967 */
1968 if ((args->flags & XFS_ATTR_INCOMPLETE) !=
1969 (entry->flags & XFS_ATTR_INCOMPLETE)) {
1970 continue;
1971 }
1972 if (entry->flags & XFS_ATTR_LOCAL) {
1973 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe);
1974 if (name_loc->namelen != args->namelen)
1975 continue;
1976 if (memcmp(args->name, (char *)name_loc->nameval,
1977 args->namelen) != 0)
1978 continue;
1979 if (((args->flags & ATTR_SECURE) != 0) !=
1980 ((entry->flags & XFS_ATTR_SECURE) != 0))
1981 continue;
1982 if (((args->flags & ATTR_ROOT) != 0) !=
1983 ((entry->flags & XFS_ATTR_ROOT) != 0))
1984 continue;
1985 args->index = probe;
1986 return(XFS_ERROR(EEXIST));
1987 } else {
1988 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe);
1989 if (name_rmt->namelen != args->namelen)
1990 continue;
1991 if (memcmp(args->name, (char *)name_rmt->name,
1992 args->namelen) != 0)
1993 continue;
1994 if (((args->flags & ATTR_SECURE) != 0) !=
1995 ((entry->flags & XFS_ATTR_SECURE) != 0))
1996 continue;
1997 if (((args->flags & ATTR_ROOT) != 0) !=
1998 ((entry->flags & XFS_ATTR_ROOT) != 0))
1999 continue;
2000 args->index = probe;
Nathan Scottc0f054e2006-03-17 17:29:18 +11002001 args->rmtblkno = be32_to_cpu(name_rmt->valueblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002 args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount,
Nathan Scottc0f054e2006-03-17 17:29:18 +11002003 be32_to_cpu(name_rmt->valuelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 return(XFS_ERROR(EEXIST));
2005 }
2006 }
2007 args->index = probe;
2008 return(XFS_ERROR(ENOATTR));
2009}
2010
2011/*
2012 * Get the value associated with an attribute name from a leaf attribute
2013 * list structure.
2014 */
2015int
2016xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args)
2017{
2018 int valuelen;
2019 xfs_attr_leafblock_t *leaf;
2020 xfs_attr_leaf_entry_t *entry;
2021 xfs_attr_leaf_name_local_t *name_loc;
2022 xfs_attr_leaf_name_remote_t *name_rmt;
2023
2024 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002025 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11002026 ASSERT(be16_to_cpu(leaf->hdr.count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 < (XFS_LBSIZE(args->dp->i_mount)/8));
Nathan Scott918ae422006-03-17 17:28:54 +11002028 ASSERT(args->index < be16_to_cpu(leaf->hdr.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029
2030 entry = &leaf->entries[args->index];
2031 if (entry->flags & XFS_ATTR_LOCAL) {
2032 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
2033 ASSERT(name_loc->namelen == args->namelen);
2034 ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0);
Nathan Scott053b5752006-03-17 17:29:09 +11002035 valuelen = be16_to_cpu(name_loc->valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 if (args->flags & ATTR_KERNOVAL) {
2037 args->valuelen = valuelen;
2038 return(0);
2039 }
2040 if (args->valuelen < valuelen) {
2041 args->valuelen = valuelen;
2042 return(XFS_ERROR(ERANGE));
2043 }
2044 args->valuelen = valuelen;
2045 memcpy(args->value, &name_loc->nameval[args->namelen], valuelen);
2046 } else {
2047 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2048 ASSERT(name_rmt->namelen == args->namelen);
2049 ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0);
Nathan Scottc0f054e2006-03-17 17:29:18 +11002050 valuelen = be32_to_cpu(name_rmt->valuelen);
2051 args->rmtblkno = be32_to_cpu(name_rmt->valueblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen);
2053 if (args->flags & ATTR_KERNOVAL) {
2054 args->valuelen = valuelen;
2055 return(0);
2056 }
2057 if (args->valuelen < valuelen) {
2058 args->valuelen = valuelen;
2059 return(XFS_ERROR(ERANGE));
2060 }
2061 args->valuelen = valuelen;
2062 }
2063 return(0);
2064}
2065
2066/*========================================================================
2067 * Utility routines.
2068 *========================================================================*/
2069
2070/*
2071 * Move the indicated entries from one leaf to another.
2072 * NOTE: this routine modifies both source and destination leaves.
2073 */
2074/*ARGSUSED*/
2075STATIC void
2076xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s,
2077 xfs_attr_leafblock_t *leaf_d, int start_d,
2078 int count, xfs_mount_t *mp)
2079{
2080 xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
2081 xfs_attr_leaf_entry_t *entry_s, *entry_d;
2082 int desti, tmp, i;
2083
2084 /*
2085 * Check for nothing to do.
2086 */
2087 if (count == 0)
2088 return;
2089
2090 /*
2091 * Set up environment.
2092 */
Nathan Scott89da0542006-03-17 17:28:40 +11002093 ASSERT(be16_to_cpu(leaf_s->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
2094 ASSERT(be16_to_cpu(leaf_d->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 hdr_s = &leaf_s->hdr;
2096 hdr_d = &leaf_d->hdr;
Nathan Scott918ae422006-03-17 17:28:54 +11002097 ASSERT((be16_to_cpu(hdr_s->count) > 0) &&
2098 (be16_to_cpu(hdr_s->count) < (XFS_LBSIZE(mp)/8)));
2099 ASSERT(be16_to_cpu(hdr_s->firstused) >=
2100 ((be16_to_cpu(hdr_s->count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 * sizeof(*entry_s))+sizeof(*hdr_s)));
Nathan Scott918ae422006-03-17 17:28:54 +11002102 ASSERT(be16_to_cpu(hdr_d->count) < (XFS_LBSIZE(mp)/8));
2103 ASSERT(be16_to_cpu(hdr_d->firstused) >=
2104 ((be16_to_cpu(hdr_d->count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 * sizeof(*entry_d))+sizeof(*hdr_d)));
2106
Nathan Scott918ae422006-03-17 17:28:54 +11002107 ASSERT(start_s < be16_to_cpu(hdr_s->count));
2108 ASSERT(start_d <= be16_to_cpu(hdr_d->count));
2109 ASSERT(count <= be16_to_cpu(hdr_s->count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110
2111 /*
2112 * Move the entries in the destination leaf up to make a hole?
2113 */
Nathan Scott918ae422006-03-17 17:28:54 +11002114 if (start_d < be16_to_cpu(hdr_d->count)) {
2115 tmp = be16_to_cpu(hdr_d->count) - start_d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116 tmp *= sizeof(xfs_attr_leaf_entry_t);
2117 entry_s = &leaf_d->entries[start_d];
2118 entry_d = &leaf_d->entries[start_d + count];
2119 memmove((char *)entry_d, (char *)entry_s, tmp);
2120 }
2121
2122 /*
2123 * Copy all entry's in the same (sorted) order,
2124 * but allocate attribute info packed and in sequence.
2125 */
2126 entry_s = &leaf_s->entries[start_s];
2127 entry_d = &leaf_d->entries[start_d];
2128 desti = start_d;
2129 for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) {
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002130 ASSERT(be16_to_cpu(entry_s->nameidx)
Nathan Scott918ae422006-03-17 17:28:54 +11002131 >= be16_to_cpu(hdr_s->firstused));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i);
2133#ifdef GROT
2134 /*
2135 * Code to drop INCOMPLETE entries. Difficult to use as we
2136 * may also need to change the insertion index. Code turned
2137 * off for 6.2, should be revisited later.
2138 */
2139 if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */
2140 memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
Nathan Scott918ae422006-03-17 17:28:54 +11002141 be16_add(&hdr_s->usedbytes, -tmp);
2142 be16_add(&hdr_s->count, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143 entry_d--; /* to compensate for ++ in loop hdr */
2144 desti--;
2145 if ((start_s + i) < offset)
2146 result++; /* insertion index adjustment */
2147 } else {
2148#endif /* GROT */
Nathan Scott918ae422006-03-17 17:28:54 +11002149 be16_add(&hdr_d->firstused, -tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150 /* both on-disk, don't endian flip twice */
2151 entry_d->hashval = entry_s->hashval;
2152 /* both on-disk, don't endian flip twice */
2153 entry_d->nameidx = hdr_d->firstused;
2154 entry_d->flags = entry_s->flags;
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002155 ASSERT(be16_to_cpu(entry_d->nameidx) + tmp
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156 <= XFS_LBSIZE(mp));
2157 memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti),
2158 XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp);
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002159 ASSERT(be16_to_cpu(entry_s->nameidx) + tmp
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 <= XFS_LBSIZE(mp));
2161 memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
Nathan Scott918ae422006-03-17 17:28:54 +11002162 be16_add(&hdr_s->usedbytes, -tmp);
2163 be16_add(&hdr_d->usedbytes, tmp);
2164 be16_add(&hdr_s->count, -1);
2165 be16_add(&hdr_d->count, 1);
2166 tmp = be16_to_cpu(hdr_d->count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 * sizeof(xfs_attr_leaf_entry_t)
2168 + sizeof(xfs_attr_leaf_hdr_t);
Nathan Scott918ae422006-03-17 17:28:54 +11002169 ASSERT(be16_to_cpu(hdr_d->firstused) >= tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170#ifdef GROT
2171 }
2172#endif /* GROT */
2173 }
2174
2175 /*
2176 * Zero out the entries we just copied.
2177 */
Nathan Scott918ae422006-03-17 17:28:54 +11002178 if (start_s == be16_to_cpu(hdr_s->count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 tmp = count * sizeof(xfs_attr_leaf_entry_t);
2180 entry_s = &leaf_s->entries[start_s];
2181 ASSERT(((char *)entry_s + tmp) <=
2182 ((char *)leaf_s + XFS_LBSIZE(mp)));
2183 memset((char *)entry_s, 0, tmp);
2184 } else {
2185 /*
2186 * Move the remaining entries down to fill the hole,
2187 * then zero the entries at the top.
2188 */
Nathan Scott918ae422006-03-17 17:28:54 +11002189 tmp = be16_to_cpu(hdr_s->count) - count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190 tmp *= sizeof(xfs_attr_leaf_entry_t);
2191 entry_s = &leaf_s->entries[start_s + count];
2192 entry_d = &leaf_s->entries[start_s];
2193 memmove((char *)entry_d, (char *)entry_s, tmp);
2194
2195 tmp = count * sizeof(xfs_attr_leaf_entry_t);
Nathan Scott918ae422006-03-17 17:28:54 +11002196 entry_s = &leaf_s->entries[be16_to_cpu(hdr_s->count)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197 ASSERT(((char *)entry_s + tmp) <=
2198 ((char *)leaf_s + XFS_LBSIZE(mp)));
2199 memset((char *)entry_s, 0, tmp);
2200 }
2201
2202 /*
2203 * Fill in the freemap information
2204 */
Nathan Scott918ae422006-03-17 17:28:54 +11002205 hdr_d->freemap[0].base = cpu_to_be16(sizeof(xfs_attr_leaf_hdr_t));
2206 be16_add(&hdr_d->freemap[0].base, be16_to_cpu(hdr_d->count) *
2207 sizeof(xfs_attr_leaf_entry_t));
2208 hdr_d->freemap[0].size = cpu_to_be16(be16_to_cpu(hdr_d->firstused)
2209 - be16_to_cpu(hdr_d->freemap[0].base));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210 hdr_d->freemap[1].base = 0;
2211 hdr_d->freemap[2].base = 0;
2212 hdr_d->freemap[1].size = 0;
2213 hdr_d->freemap[2].size = 0;
2214 hdr_s->holes = 1; /* leaf may not be compact */
2215}
2216
2217/*
2218 * Compare two leaf blocks "order".
2219 * Return 0 unless leaf2 should go before leaf1.
2220 */
2221int
2222xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
2223{
2224 xfs_attr_leafblock_t *leaf1, *leaf2;
2225
2226 leaf1 = leaf1_bp->data;
2227 leaf2 = leaf2_bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002228 ASSERT((be16_to_cpu(leaf1->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC) &&
2229 (be16_to_cpu(leaf2->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC));
Nathan Scott918ae422006-03-17 17:28:54 +11002230 if ((be16_to_cpu(leaf1->hdr.count) > 0) &&
2231 (be16_to_cpu(leaf2->hdr.count) > 0) &&
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002232 ((be32_to_cpu(leaf2->entries[0].hashval) <
2233 be32_to_cpu(leaf1->entries[0].hashval)) ||
2234 (be32_to_cpu(leaf2->entries[
2235 be16_to_cpu(leaf2->hdr.count)-1].hashval) <
2236 be32_to_cpu(leaf1->entries[
2237 be16_to_cpu(leaf1->hdr.count)-1].hashval)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 return(1);
2239 }
2240 return(0);
2241}
2242
2243/*
2244 * Pick up the last hashvalue from a leaf block.
2245 */
2246xfs_dahash_t
2247xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count)
2248{
2249 xfs_attr_leafblock_t *leaf;
2250
2251 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002252 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 if (count)
Nathan Scott918ae422006-03-17 17:28:54 +11002254 *count = be16_to_cpu(leaf->hdr.count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 if (!leaf->hdr.count)
2256 return(0);
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002257 return be32_to_cpu(leaf->entries[be16_to_cpu(leaf->hdr.count)-1].hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258}
2259
2260/*
2261 * Calculate the number of bytes used to store the indicated attribute
2262 * (whether local or remote only calculate bytes in this block).
2263 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002264STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
2266{
2267 xfs_attr_leaf_name_local_t *name_loc;
2268 xfs_attr_leaf_name_remote_t *name_rmt;
2269 int size;
2270
Nathan Scott89da0542006-03-17 17:28:40 +11002271 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272 if (leaf->entries[index].flags & XFS_ATTR_LOCAL) {
2273 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index);
2274 size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen,
Nathan Scott053b5752006-03-17 17:29:09 +11002275 be16_to_cpu(name_loc->valuelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276 } else {
2277 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index);
2278 size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen);
2279 }
2280 return(size);
2281}
2282
2283/*
2284 * Calculate the number of bytes that would be required to store the new
2285 * attribute (whether local or remote only calculate bytes in this block).
2286 * This routine decides as a side effect whether the attribute will be
2287 * a "local" or a "remote" attribute.
2288 */
2289int
Nathan Scottaa82daa2005-11-02 10:33:33 +11002290xfs_attr_leaf_newentsize(int namelen, int valuelen, int blocksize, int *local)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291{
2292 int size;
2293
Nathan Scottaa82daa2005-11-02 10:33:33 +11002294 size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(namelen, valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295 if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) {
2296 if (local) {
2297 *local = 1;
2298 }
2299 } else {
Nathan Scottaa82daa2005-11-02 10:33:33 +11002300 size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301 if (local) {
2302 *local = 0;
2303 }
2304 }
2305 return(size);
2306}
2307
2308/*
2309 * Copy out attribute list entries for attr_list(), for leaf attribute lists.
2310 */
2311int
2312xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context)
2313{
2314 attrlist_cursor_kern_t *cursor;
2315 xfs_attr_leafblock_t *leaf;
2316 xfs_attr_leaf_entry_t *entry;
2317 xfs_attr_leaf_name_local_t *name_loc;
2318 xfs_attr_leaf_name_remote_t *name_rmt;
2319 int retval, i;
2320
2321 ASSERT(bp != NULL);
2322 leaf = bp->data;
2323 cursor = context->cursor;
2324 cursor->initted = 1;
2325
2326 xfs_attr_trace_l_cl("blk start", context, leaf);
2327
2328 /*
2329 * Re-find our place in the leaf block if this is a new syscall.
2330 */
2331 if (context->resynch) {
2332 entry = &leaf->entries[0];
Nathan Scott918ae422006-03-17 17:28:54 +11002333 for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002334 if (be32_to_cpu(entry->hashval) == cursor->hashval) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335 if (cursor->offset == context->dupcnt) {
2336 context->dupcnt = 0;
2337 break;
2338 }
2339 context->dupcnt++;
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002340 } else if (be32_to_cpu(entry->hashval) >
2341 cursor->hashval) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 context->dupcnt = 0;
2343 break;
2344 }
2345 }
Nathan Scott918ae422006-03-17 17:28:54 +11002346 if (i == be16_to_cpu(leaf->hdr.count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347 xfs_attr_trace_l_c("not found", context);
2348 return(0);
2349 }
2350 } else {
2351 entry = &leaf->entries[0];
2352 i = 0;
2353 }
2354 context->resynch = 0;
2355
2356 /*
2357 * We have found our place, start copying out the new attributes.
2358 */
2359 retval = 0;
Nathan Scott918ae422006-03-17 17:28:54 +11002360 for ( ; (i < be16_to_cpu(leaf->hdr.count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002361 && (retval == 0); entry++, i++) {
2362 attrnames_t *namesp;
2363
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002364 if (be32_to_cpu(entry->hashval) != cursor->hashval) {
2365 cursor->hashval = be32_to_cpu(entry->hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366 cursor->offset = 0;
2367 }
2368
2369 if (entry->flags & XFS_ATTR_INCOMPLETE)
2370 continue; /* skip incomplete entries */
2371 if (((context->flags & ATTR_SECURE) != 0) !=
2372 ((entry->flags & XFS_ATTR_SECURE) != 0) &&
2373 !(context->flags & ATTR_KERNORMALS))
2374 continue; /* skip non-matching entries */
2375 if (((context->flags & ATTR_ROOT) != 0) !=
2376 ((entry->flags & XFS_ATTR_ROOT) != 0) &&
2377 !(context->flags & ATTR_KERNROOTLS))
2378 continue; /* skip non-matching entries */
2379
2380 namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure :
2381 ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted :
2382 &attr_user);
2383
2384 if (entry->flags & XFS_ATTR_LOCAL) {
2385 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
2386 if (context->flags & ATTR_KERNOVAL) {
2387 ASSERT(context->flags & ATTR_KERNAMELS);
2388 context->count += namesp->attr_namelen +
2389 (int)name_loc->namelen + 1;
2390 } else {
2391 retval = xfs_attr_put_listent(context, namesp,
2392 (char *)name_loc->nameval,
2393 (int)name_loc->namelen,
Nathan Scott053b5752006-03-17 17:29:09 +11002394 be16_to_cpu(name_loc->valuelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395 }
2396 } else {
2397 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2398 if (context->flags & ATTR_KERNOVAL) {
2399 ASSERT(context->flags & ATTR_KERNAMELS);
2400 context->count += namesp->attr_namelen +
2401 (int)name_rmt->namelen + 1;
2402 } else {
2403 retval = xfs_attr_put_listent(context, namesp,
2404 (char *)name_rmt->name,
2405 (int)name_rmt->namelen,
Nathan Scottc0f054e2006-03-17 17:29:18 +11002406 be32_to_cpu(name_rmt->valuelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407 }
2408 }
2409 if (retval == 0) {
2410 cursor->offset++;
2411 }
2412 }
2413 xfs_attr_trace_l_cl("blk end", context, leaf);
2414 return(retval);
2415}
2416
2417#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
2418 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
2419#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
2420 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
2421 & ~(sizeof(u_int32_t)-1))
2422
2423/*
2424 * Format an attribute and copy it out to the user's buffer.
2425 * Take care to check values and protect against them changing later,
2426 * we may be reading them directly out of a user buffer.
2427 */
2428/*ARGSUSED*/
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002429STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430xfs_attr_put_listent(xfs_attr_list_context_t *context,
2431 attrnames_t *namesp, char *name, int namelen, int valuelen)
2432{
2433 attrlist_ent_t *aep;
2434 int arraytop;
2435
2436 ASSERT(!(context->flags & ATTR_KERNOVAL));
2437 if (context->flags & ATTR_KERNAMELS) {
2438 char *offset;
2439
2440 ASSERT(context->count >= 0);
2441
2442 arraytop = context->count + namesp->attr_namelen + namelen + 1;
2443 if (arraytop > context->firstu) {
2444 context->count = -1; /* insufficient space */
2445 return(1);
2446 }
2447 offset = (char *)context->alist + context->count;
2448 strncpy(offset, namesp->attr_name, namesp->attr_namelen);
2449 offset += namesp->attr_namelen;
2450 strncpy(offset, name, namelen); /* real name */
2451 offset += namelen;
2452 *offset = '\0';
2453 context->count += namesp->attr_namelen + namelen + 1;
2454 return(0);
2455 }
2456
2457 ASSERT(context->count >= 0);
2458 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
2459 ASSERT(context->firstu >= sizeof(*context->alist));
2460 ASSERT(context->firstu <= context->bufsize);
2461
2462 arraytop = sizeof(*context->alist) +
2463 context->count * sizeof(context->alist->al_offset[0]);
2464 context->firstu -= ATTR_ENTSIZE(namelen);
2465 if (context->firstu < arraytop) {
2466 xfs_attr_trace_l_c("buffer full", context);
2467 context->alist->al_more = 1;
2468 return(1);
2469 }
2470
2471 aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
2472 aep->a_valuelen = valuelen;
2473 memcpy(aep->a_name, name, namelen);
2474 aep->a_name[ namelen ] = 0;
2475 context->alist->al_offset[ context->count++ ] = context->firstu;
2476 context->alist->al_count = context->count;
2477 xfs_attr_trace_l_c("add", context);
2478 return(0);
2479}
2480
2481/*========================================================================
2482 * Manage the INCOMPLETE flag in a leaf entry
2483 *========================================================================*/
2484
2485/*
2486 * Clear the INCOMPLETE flag on an entry in a leaf block.
2487 */
2488int
2489xfs_attr_leaf_clearflag(xfs_da_args_t *args)
2490{
2491 xfs_attr_leafblock_t *leaf;
2492 xfs_attr_leaf_entry_t *entry;
2493 xfs_attr_leaf_name_remote_t *name_rmt;
2494 xfs_dabuf_t *bp;
2495 int error;
2496#ifdef DEBUG
2497 xfs_attr_leaf_name_local_t *name_loc;
2498 int namelen;
2499 char *name;
2500#endif /* DEBUG */
2501
2502 /*
2503 * Set up the operation.
2504 */
2505 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
2506 XFS_ATTR_FORK);
2507 if (error) {
2508 return(error);
2509 }
2510 ASSERT(bp != NULL);
2511
2512 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002513 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11002514 ASSERT(args->index < be16_to_cpu(leaf->hdr.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 ASSERT(args->index >= 0);
2516 entry = &leaf->entries[ args->index ];
2517 ASSERT(entry->flags & XFS_ATTR_INCOMPLETE);
2518
2519#ifdef DEBUG
2520 if (entry->flags & XFS_ATTR_LOCAL) {
2521 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
2522 namelen = name_loc->namelen;
2523 name = (char *)name_loc->nameval;
2524 } else {
2525 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2526 namelen = name_rmt->namelen;
2527 name = (char *)name_rmt->name;
2528 }
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002529 ASSERT(be32_to_cpu(entry->hashval) == args->hashval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 ASSERT(namelen == args->namelen);
2531 ASSERT(memcmp(name, args->name, namelen) == 0);
2532#endif /* DEBUG */
2533
2534 entry->flags &= ~XFS_ATTR_INCOMPLETE;
2535 xfs_da_log_buf(args->trans, bp,
2536 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
2537
2538 if (args->rmtblkno) {
2539 ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0);
2540 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
Nathan Scottc0f054e2006-03-17 17:29:18 +11002541 name_rmt->valueblk = cpu_to_be32(args->rmtblkno);
2542 name_rmt->valuelen = cpu_to_be32(args->valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543 xfs_da_log_buf(args->trans, bp,
2544 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
2545 }
2546 xfs_da_buf_done(bp);
2547
2548 /*
2549 * Commit the flag value change and start the next trans in series.
2550 */
2551 error = xfs_attr_rolltrans(&args->trans, args->dp);
2552
2553 return(error);
2554}
2555
2556/*
2557 * Set the INCOMPLETE flag on an entry in a leaf block.
2558 */
2559int
2560xfs_attr_leaf_setflag(xfs_da_args_t *args)
2561{
2562 xfs_attr_leafblock_t *leaf;
2563 xfs_attr_leaf_entry_t *entry;
2564 xfs_attr_leaf_name_remote_t *name_rmt;
2565 xfs_dabuf_t *bp;
2566 int error;
2567
2568 /*
2569 * Set up the operation.
2570 */
2571 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
2572 XFS_ATTR_FORK);
2573 if (error) {
2574 return(error);
2575 }
2576 ASSERT(bp != NULL);
2577
2578 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002579 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11002580 ASSERT(args->index < be16_to_cpu(leaf->hdr.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581 ASSERT(args->index >= 0);
2582 entry = &leaf->entries[ args->index ];
2583
2584 ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0);
2585 entry->flags |= XFS_ATTR_INCOMPLETE;
2586 xfs_da_log_buf(args->trans, bp,
2587 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
2588 if ((entry->flags & XFS_ATTR_LOCAL) == 0) {
2589 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2590 name_rmt->valueblk = 0;
2591 name_rmt->valuelen = 0;
2592 xfs_da_log_buf(args->trans, bp,
2593 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
2594 }
2595 xfs_da_buf_done(bp);
2596
2597 /*
2598 * Commit the flag value change and start the next trans in series.
2599 */
2600 error = xfs_attr_rolltrans(&args->trans, args->dp);
2601
2602 return(error);
2603}
2604
2605/*
2606 * In a single transaction, clear the INCOMPLETE flag on the leaf entry
2607 * given by args->blkno/index and set the INCOMPLETE flag on the leaf
2608 * entry given by args->blkno2/index2.
2609 *
2610 * Note that they could be in different blocks, or in the same block.
2611 */
2612int
2613xfs_attr_leaf_flipflags(xfs_da_args_t *args)
2614{
2615 xfs_attr_leafblock_t *leaf1, *leaf2;
2616 xfs_attr_leaf_entry_t *entry1, *entry2;
2617 xfs_attr_leaf_name_remote_t *name_rmt;
2618 xfs_dabuf_t *bp1, *bp2;
2619 int error;
2620#ifdef DEBUG
2621 xfs_attr_leaf_name_local_t *name_loc;
2622 int namelen1, namelen2;
2623 char *name1, *name2;
2624#endif /* DEBUG */
2625
2626 /*
2627 * Read the block containing the "old" attr
2628 */
2629 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1,
2630 XFS_ATTR_FORK);
2631 if (error) {
2632 return(error);
2633 }
2634 ASSERT(bp1 != NULL);
2635
2636 /*
2637 * Read the block containing the "new" attr, if it is different
2638 */
2639 if (args->blkno2 != args->blkno) {
2640 error = xfs_da_read_buf(args->trans, args->dp, args->blkno2,
2641 -1, &bp2, XFS_ATTR_FORK);
2642 if (error) {
2643 return(error);
2644 }
2645 ASSERT(bp2 != NULL);
2646 } else {
2647 bp2 = bp1;
2648 }
2649
2650 leaf1 = bp1->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002651 ASSERT(be16_to_cpu(leaf1->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11002652 ASSERT(args->index < be16_to_cpu(leaf1->hdr.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653 ASSERT(args->index >= 0);
2654 entry1 = &leaf1->entries[ args->index ];
2655
2656 leaf2 = bp2->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002657 ASSERT(be16_to_cpu(leaf2->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Nathan Scott918ae422006-03-17 17:28:54 +11002658 ASSERT(args->index2 < be16_to_cpu(leaf2->hdr.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659 ASSERT(args->index2 >= 0);
2660 entry2 = &leaf2->entries[ args->index2 ];
2661
2662#ifdef DEBUG
2663 if (entry1->flags & XFS_ATTR_LOCAL) {
2664 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index);
2665 namelen1 = name_loc->namelen;
2666 name1 = (char *)name_loc->nameval;
2667 } else {
2668 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
2669 namelen1 = name_rmt->namelen;
2670 name1 = (char *)name_rmt->name;
2671 }
2672 if (entry2->flags & XFS_ATTR_LOCAL) {
2673 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2);
2674 namelen2 = name_loc->namelen;
2675 name2 = (char *)name_loc->nameval;
2676 } else {
2677 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
2678 namelen2 = name_rmt->namelen;
2679 name2 = (char *)name_rmt->name;
2680 }
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002681 ASSERT(be32_to_cpu(entry1->hashval) == be32_to_cpu(entry2->hashval));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682 ASSERT(namelen1 == namelen2);
2683 ASSERT(memcmp(name1, name2, namelen1) == 0);
2684#endif /* DEBUG */
2685
2686 ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE);
2687 ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0);
2688
2689 entry1->flags &= ~XFS_ATTR_INCOMPLETE;
2690 xfs_da_log_buf(args->trans, bp1,
2691 XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1)));
2692 if (args->rmtblkno) {
2693 ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0);
2694 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
Nathan Scottc0f054e2006-03-17 17:29:18 +11002695 name_rmt->valueblk = cpu_to_be32(args->rmtblkno);
2696 name_rmt->valuelen = cpu_to_be32(args->valuelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 xfs_da_log_buf(args->trans, bp1,
2698 XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt)));
2699 }
2700
2701 entry2->flags |= XFS_ATTR_INCOMPLETE;
2702 xfs_da_log_buf(args->trans, bp2,
2703 XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2)));
2704 if ((entry2->flags & XFS_ATTR_LOCAL) == 0) {
2705 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
2706 name_rmt->valueblk = 0;
2707 name_rmt->valuelen = 0;
2708 xfs_da_log_buf(args->trans, bp2,
2709 XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt)));
2710 }
2711 xfs_da_buf_done(bp1);
2712 if (bp1 != bp2)
2713 xfs_da_buf_done(bp2);
2714
2715 /*
2716 * Commit the flag value change and start the next trans in series.
2717 */
2718 error = xfs_attr_rolltrans(&args->trans, args->dp);
2719
2720 return(error);
2721}
2722
2723/*========================================================================
2724 * Indiscriminately delete the entire attribute fork
2725 *========================================================================*/
2726
2727/*
2728 * Recurse (gasp!) through the attribute nodes until we find leaves.
2729 * We're doing a depth-first traversal in order to invalidate everything.
2730 */
2731int
2732xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp)
2733{
2734 xfs_da_blkinfo_t *info;
2735 xfs_daddr_t blkno;
2736 xfs_dabuf_t *bp;
2737 int error;
2738
2739 /*
2740 * Read block 0 to see what we have to work with.
2741 * We only get here if we have extents, since we remove
2742 * the extents in reverse order the extent containing
2743 * block 0 must still be there.
2744 */
2745 error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
2746 if (error)
2747 return(error);
2748 blkno = xfs_da_blkno(bp);
2749
2750 /*
2751 * Invalidate the tree, even if the "tree" is only a single leaf block.
2752 * This is a depth-first traversal!
2753 */
2754 info = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002755 if (be16_to_cpu(info->magic) == XFS_DA_NODE_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756 error = xfs_attr_node_inactive(trans, dp, bp, 1);
Nathan Scott89da0542006-03-17 17:28:40 +11002757 } else if (be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 error = xfs_attr_leaf_inactive(trans, dp, bp);
2759 } else {
2760 error = XFS_ERROR(EIO);
2761 xfs_da_brelse(*trans, bp);
2762 }
2763 if (error)
2764 return(error);
2765
2766 /*
2767 * Invalidate the incore copy of the root block.
2768 */
2769 error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
2770 if (error)
2771 return(error);
2772 xfs_da_binval(*trans, bp); /* remove from cache */
2773 /*
2774 * Commit the invalidate and start the next transaction.
2775 */
2776 error = xfs_attr_rolltrans(trans, dp);
2777
2778 return (error);
2779}
2780
2781/*
2782 * Recurse (gasp!) through the attribute nodes until we find leaves.
2783 * We're doing a depth-first traversal in order to invalidate everything.
2784 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002785STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002786xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp,
2787 int level)
2788{
2789 xfs_da_blkinfo_t *info;
2790 xfs_da_intnode_t *node;
2791 xfs_dablk_t child_fsb;
2792 xfs_daddr_t parent_blkno, child_blkno;
2793 int error, count, i;
2794 xfs_dabuf_t *child_bp;
2795
2796 /*
2797 * Since this code is recursive (gasp!) we must protect ourselves.
2798 */
2799 if (level > XFS_DA_NODE_MAXDEPTH) {
2800 xfs_da_brelse(*trans, bp); /* no locks for later trans */
2801 return(XFS_ERROR(EIO));
2802 }
2803
2804 node = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002805 ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 parent_blkno = xfs_da_blkno(bp); /* save for re-read later */
Nathan Scottfac80cc2006-03-17 17:29:56 +11002807 count = be16_to_cpu(node->hdr.count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808 if (!count) {
2809 xfs_da_brelse(*trans, bp);
2810 return(0);
2811 }
Nathan Scott403432d2006-03-17 17:29:46 +11002812 child_fsb = be32_to_cpu(node->btree[0].before);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002813 xfs_da_brelse(*trans, bp); /* no locks for later trans */
2814
2815 /*
2816 * If this is the node level just above the leaves, simply loop
2817 * over the leaves removing all of them. If this is higher up
2818 * in the tree, recurse downward.
2819 */
2820 for (i = 0; i < count; i++) {
2821 /*
2822 * Read the subsidiary block to see what we have to work with.
2823 * Don't do this in a transaction. This is a depth-first
2824 * traversal of the tree so we may deal with many blocks
2825 * before we come back to this one.
2826 */
2827 error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp,
2828 XFS_ATTR_FORK);
2829 if (error)
2830 return(error);
2831 if (child_bp) {
2832 /* save for re-read later */
2833 child_blkno = xfs_da_blkno(child_bp);
2834
2835 /*
2836 * Invalidate the subtree, however we have to.
2837 */
2838 info = child_bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002839 if (be16_to_cpu(info->magic) == XFS_DA_NODE_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840 error = xfs_attr_node_inactive(trans, dp,
2841 child_bp, level+1);
Nathan Scott89da0542006-03-17 17:28:40 +11002842 } else if (be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843 error = xfs_attr_leaf_inactive(trans, dp,
2844 child_bp);
2845 } else {
2846 error = XFS_ERROR(EIO);
2847 xfs_da_brelse(*trans, child_bp);
2848 }
2849 if (error)
2850 return(error);
2851
2852 /*
2853 * Remove the subsidiary block from the cache
2854 * and from the log.
2855 */
2856 error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
2857 &child_bp, XFS_ATTR_FORK);
2858 if (error)
2859 return(error);
2860 xfs_da_binval(*trans, child_bp);
2861 }
2862
2863 /*
2864 * If we're not done, re-read the parent to get the next
2865 * child block number.
2866 */
2867 if ((i+1) < count) {
2868 error = xfs_da_read_buf(*trans, dp, 0, parent_blkno,
2869 &bp, XFS_ATTR_FORK);
2870 if (error)
2871 return(error);
Nathan Scott403432d2006-03-17 17:29:46 +11002872 child_fsb = be32_to_cpu(node->btree[i+1].before);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002873 xfs_da_brelse(*trans, bp);
2874 }
2875 /*
2876 * Atomically commit the whole invalidate stuff.
2877 */
2878 if ((error = xfs_attr_rolltrans(trans, dp)))
2879 return (error);
2880 }
2881
2882 return(0);
2883}
2884
2885/*
2886 * Invalidate all of the "remote" value regions pointed to by a particular
2887 * leaf block.
2888 * Note that we must release the lock on the buffer so that we are not
2889 * caught holding something that the logging code wants to flush to disk.
2890 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002891STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002892xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp)
2893{
2894 xfs_attr_leafblock_t *leaf;
2895 xfs_attr_leaf_entry_t *entry;
2896 xfs_attr_leaf_name_remote_t *name_rmt;
2897 xfs_attr_inactive_list_t *list, *lp;
2898 int error, count, size, tmp, i;
2899
2900 leaf = bp->data;
Nathan Scott89da0542006-03-17 17:28:40 +11002901 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902
2903 /*
2904 * Count the number of "remote" value extents.
2905 */
2906 count = 0;
2907 entry = &leaf->entries[0];
Nathan Scott918ae422006-03-17 17:28:54 +11002908 for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002909 if (be16_to_cpu(entry->nameidx) &&
2910 ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002911 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2912 if (name_rmt->valueblk)
2913 count++;
2914 }
2915 }
2916
2917 /*
2918 * If there are no "remote" values, we're done.
2919 */
2920 if (count == 0) {
2921 xfs_da_brelse(*trans, bp);
2922 return(0);
2923 }
2924
2925 /*
2926 * Allocate storage for a list of all the "remote" value extents.
2927 */
2928 size = count * sizeof(xfs_attr_inactive_list_t);
2929 list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP);
2930
2931 /*
2932 * Identify each of the "remote" value extents.
2933 */
2934 lp = list;
2935 entry = &leaf->entries[0];
Nathan Scott918ae422006-03-17 17:28:54 +11002936 for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {
Nathan Scott6b19f2d2006-03-17 17:29:02 +11002937 if (be16_to_cpu(entry->nameidx) &&
2938 ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2940 if (name_rmt->valueblk) {
Nathan Scottd7929ff2006-03-17 17:29:36 +11002941 lp->valueblk = be32_to_cpu(name_rmt->valueblk);
2942 lp->valuelen = XFS_B_TO_FSB(dp->i_mount,
2943 be32_to_cpu(name_rmt->valuelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002944 lp++;
2945 }
2946 }
2947 }
2948 xfs_da_brelse(*trans, bp); /* unlock for trans. in freextent() */
2949
2950 /*
2951 * Invalidate each of the "remote" value extents.
2952 */
2953 error = 0;
2954 for (lp = list, i = 0; i < count; i++, lp++) {
2955 tmp = xfs_attr_leaf_freextent(trans, dp,
Nathan Scottd7929ff2006-03-17 17:29:36 +11002956 lp->valueblk, lp->valuelen);
2957
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 if (error == 0)
2959 error = tmp; /* save only the 1st errno */
2960 }
2961
2962 kmem_free((xfs_caddr_t)list, size);
2963 return(error);
2964}
2965
2966/*
2967 * Look at all the extents for this logical region,
2968 * invalidate any buffers that are incore/in transactions.
2969 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002970STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
2972 xfs_dablk_t blkno, int blkcnt)
2973{
2974 xfs_bmbt_irec_t map;
2975 xfs_dablk_t tblkno;
2976 int tblkcnt, dblkcnt, nmap, error;
2977 xfs_daddr_t dblkno;
2978 xfs_buf_t *bp;
2979
2980 /*
2981 * Roll through the "value", invalidating the attribute value's
2982 * blocks.
2983 */
2984 tblkno = blkno;
2985 tblkcnt = blkcnt;
2986 while (tblkcnt > 0) {
2987 /*
2988 * Try to remember where we decided to put the value.
2989 */
2990 nmap = 1;
2991 error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt,
2992 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2993 NULL, 0, &map, &nmap, NULL);
2994 if (error) {
2995 return(error);
2996 }
2997 ASSERT(nmap == 1);
2998 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
2999
3000 /*
3001 * If it's a hole, these are already unmapped
3002 * so there's nothing to invalidate.
3003 */
3004 if (map.br_startblock != HOLESTARTBLOCK) {
3005
3006 dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
3007 map.br_startblock);
3008 dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
3009 map.br_blockcount);
3010 bp = xfs_trans_get_buf(*trans,
3011 dp->i_mount->m_ddev_targp,
3012 dblkno, dblkcnt, XFS_BUF_LOCK);
3013 xfs_trans_binval(*trans, bp);
3014 /*
3015 * Roll to next transaction.
3016 */
3017 if ((error = xfs_attr_rolltrans(trans, dp)))
3018 return (error);
3019 }
3020
3021 tblkno += map.br_blockcount;
3022 tblkcnt -= map.br_blockcount;
3023 }
3024
3025 return(0);
3026}
3027
3028
3029/*
3030 * Roll from one trans in the sequence of PERMANENT transactions to the next.
3031 */
3032int
3033xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp)
3034{
3035 xfs_trans_t *trans;
3036 unsigned int logres, count;
3037 int error;
3038
3039 /*
3040 * Ensure that the inode is always logged.
3041 */
3042 trans = *transp;
3043 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
3044
3045 /*
3046 * Copy the critical parameters from one trans to the next.
3047 */
3048 logres = trans->t_log_res;
3049 count = trans->t_log_count;
3050 *transp = xfs_trans_dup(trans);
3051
3052 /*
3053 * Commit the current transaction.
3054 * If this commit failed, then it'd just unlock those items that
3055 * are not marked ihold. That also means that a filesystem shutdown
3056 * is in progress. The caller takes the responsibility to cancel
3057 * the duplicate transaction that gets returned.
3058 */
3059 if ((error = xfs_trans_commit(trans, 0, NULL)))
3060 return (error);
3061
3062 trans = *transp;
3063
3064 /*
3065 * Reserve space in the log for th next transaction.
3066 * This also pushes items in the "AIL", the list of logged items,
3067 * out to disk if they are taking up space at the tail of the log
3068 * that we want to use. This requires that either nothing be locked
3069 * across this call, or that anything that is locked be logged in
3070 * the prior and the next transactions.
3071 */
3072 error = xfs_trans_reserve(trans, 0, logres, 0,
3073 XFS_TRANS_PERM_LOG_RES, count);
3074 /*
3075 * Ensure that the inode is in the new transaction and locked.
3076 */
3077 if (!error) {
3078 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
3079 xfs_trans_ihold(trans, dp);
3080 }
3081 return (error);
3082
3083}