1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir.h"
28 #include "xfs_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir_sf.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_alloc.h"
42 #include "xfs_rtalloc.h"
43 #include "xfs_bmap.h"
44 #include "xfs_error.h"
45 #include "xfs_rw.h"
46 #include "xfs_quota.h"
47 #include "xfs_fsops.h"
48
49 STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
50 STATIC int xfs_uuid_mount(xfs_mount_t *);
51 STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
52 STATIC void xfs_unmountfs_wait(xfs_mount_t *);
53
54
55 #ifdef HAVE_PERCPU_SB
56 STATIC void xfs_icsb_destroy_counters(xfs_mount_t *);
57 STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, int);
58 STATIC void xfs_icsb_sync_counters(xfs_mount_t *);
59 STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
60 int, int);
61 STATIC int xfs_icsb_modify_counters_locked(xfs_mount_t *, xfs_sb_field_t,
62 int, int);
63 STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
64
65 #else
66
67 #define xfs_icsb_destroy_counters(mp) do { } while (0)
68 #define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
69 #define xfs_icsb_sync_counters(mp) do { } while (0)
70 #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
71 #define xfs_icsb_modify_counters_locked(mp, a, b, c) do { } while (0)
72
73 #endif
74
75 static const struct {
76 short offset;
77 short type; /* 0 = integer
78 * 1 = binary / string (no translation)
79 */
80 } xfs_sb_info[] = {
81 { offsetof(xfs_sb_t, sb_magicnum), 0 },
82 { offsetof(xfs_sb_t, sb_blocksize), 0 },
83 { offsetof(xfs_sb_t, sb_dblocks), 0 },
84 { offsetof(xfs_sb_t, sb_rblocks), 0 },
85 { offsetof(xfs_sb_t, sb_rextents), 0 },
86 { offsetof(xfs_sb_t, sb_uuid), 1 },
87 { offsetof(xfs_sb_t, sb_logstart), 0 },
88 { offsetof(xfs_sb_t, sb_rootino), 0 },
89 { offsetof(xfs_sb_t, sb_rbmino), 0 },
90 { offsetof(xfs_sb_t, sb_rsumino), 0 },
91 { offsetof(xfs_sb_t, sb_rextsize), 0 },
92 { offsetof(xfs_sb_t, sb_agblocks), 0 },
93 { offsetof(xfs_sb_t, sb_agcount), 0 },
94 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
95 { offsetof(xfs_sb_t, sb_logblocks), 0 },
96 { offsetof(xfs_sb_t, sb_versionnum), 0 },
97 { offsetof(xfs_sb_t, sb_sectsize), 0 },
98 { offsetof(xfs_sb_t, sb_inodesize), 0 },
99 { offsetof(xfs_sb_t, sb_inopblock), 0 },
100 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
101 { offsetof(xfs_sb_t, sb_blocklog), 0 },
102 { offsetof(xfs_sb_t, sb_sectlog), 0 },
103 { offsetof(xfs_sb_t, sb_inodelog), 0 },
104 { offsetof(xfs_sb_t, sb_inopblog), 0 },
105 { offsetof(xfs_sb_t, sb_agblklog), 0 },
106 { offsetof(xfs_sb_t, sb_rextslog), 0 },
107 { offsetof(xfs_sb_t, sb_inprogress), 0 },
108 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
109 { offsetof(xfs_sb_t, sb_icount), 0 },
110 { offsetof(xfs_sb_t, sb_ifree), 0 },
111 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
112 { offsetof(xfs_sb_t, sb_frextents), 0 },
113 { offsetof(xfs_sb_t, sb_uquotino), 0 },
114 { offsetof(xfs_sb_t, sb_gquotino), 0 },
115 { offsetof(xfs_sb_t, sb_qflags), 0 },
116 { offsetof(xfs_sb_t, sb_flags), 0 },
117 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
118 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
119 { offsetof(xfs_sb_t, sb_unit), 0 },
120 { offsetof(xfs_sb_t, sb_width), 0 },
121 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
122 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
123 { offsetof(xfs_sb_t, sb_logsectsize),0 },
124 { offsetof(xfs_sb_t, sb_logsunit), 0 },
125 { offsetof(xfs_sb_t, sb_features2), 0 },
126 { sizeof(xfs_sb_t), 0 }
127 };
128
129 /*
130 * Return a pointer to an initialized xfs_mount structure.
131 */
132 xfs_mount_t *
xfs_mount_init(void)133 xfs_mount_init(void)
134 {
135 xfs_mount_t *mp;
136
137 mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP);
138
139 if (xfs_icsb_init_counters(mp)) {
140 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
141 }
142
143 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
144 spinlock_init(&mp->m_sb_lock, "xfs_sb");
145 /* FreeBSD specfic */
146 sx_init(&mp->m_ilock, "xfs_mnt");
147 initnsema(&mp->m_growlock, 1, "xfs_grow");
148 /*
149 * Initialize the AIL.
150 */
151 xfs_trans_ail_init(mp);
152
153 atomic_set(&mp->m_active_trans, 0);
154
155 return mp;
156 }
157
158 /*
159 * Free up the resources associated with a mount structure. Assume that
160 * the structure was initially zeroed, so we can tell which fields got
161 * initialized.
162 */
163 void
xfs_mount_free(xfs_mount_t * mp,int remove_bhv)164 xfs_mount_free(
165 xfs_mount_t *mp,
166 int remove_bhv)
167 {
168 if (mp->m_ihash)
169 xfs_ihash_free(mp);
170 if (mp->m_chash)
171 xfs_chash_free(mp);
172
173 if (mp->m_perag) {
174 int agno;
175
176 for (agno = 0; agno < mp->m_maxagi; agno++)
177 if (mp->m_perag[agno].pagb_list)
178 kmem_free(mp->m_perag[agno].pagb_list,
179 sizeof(xfs_perag_busy_t) *
180 XFS_PAGB_NUM_SLOTS);
181 kmem_free(mp->m_perag,
182 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
183 }
184
185 AIL_LOCK_DESTROY(&mp->m_ail_lock);
186 spinlock_destroy(&mp->m_sb_lock);
187 /* FreeBSD specfic */
188 sx_destroy(&mp->m_ilock);
189 freesema(&mp->m_growlock);
190 if (mp->m_quotainfo)
191 XFS_QM_DONE(mp);
192
193 if (mp->m_fsname != NULL)
194 kmem_free(mp->m_fsname, mp->m_fsname_len);
195 if (mp->m_rtname != NULL)
196 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
197 if (mp->m_logname != NULL)
198 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
199
200 if (remove_bhv) {
201 xfs_vfs_t *vfsp = XFS_MTOVFS(mp);
202
203 bhv_remove_all_vfsops(vfsp, 0);
204 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
205 }
206
207 xfs_icsb_destroy_counters(mp);
208 kmem_free(mp, sizeof(xfs_mount_t));
209 }
210
211
212 /*
213 * Check the validity of the SB found.
214 */
215 STATIC int
xfs_mount_validate_sb(xfs_mount_t * mp,xfs_sb_t * sbp,int flags)216 xfs_mount_validate_sb(
217 xfs_mount_t *mp,
218 xfs_sb_t *sbp,
219 int flags)
220 {
221 /*
222 * If the log device and data device have the
223 * same device number, the log is internal.
224 * Consequently, the sb_logstart should be non-zero. If
225 * we have a zero sb_logstart in this case, we may be trying to mount
226 * a volume filesystem in a non-volume manner.
227 */
228 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
229 xfs_fs_mount_cmn_err(flags, "bad magic number");
230 return XFS_ERROR(EWRONGFS);
231 }
232
233 if (!XFS_SB_GOOD_VERSION(sbp)) {
234 xfs_fs_mount_cmn_err(flags, "bad version");
235 return XFS_ERROR(EWRONGFS);
236 }
237
238 if (unlikely(
239 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
240 xfs_fs_mount_cmn_err(flags,
241 "filesystem is marked as having an external log; "
242 "specify logdev on the\nmount command line.");
243 return XFS_ERROR(EINVAL);
244 }
245
246 if (unlikely(
247 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
248 xfs_fs_mount_cmn_err(flags,
249 "filesystem is marked as having an internal log; "
250 "do not specify logdev on\nthe mount command line.");
251 return XFS_ERROR(EINVAL);
252 }
253
254 /*
255 * More sanity checking. These were stolen directly from
256 * xfs_repair.
257 */
258 if (unlikely(
259 sbp->sb_agcount <= 0 ||
260 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
261 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
262 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
263 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
264 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
265 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
266 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
267 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
268 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
269 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
270 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
271 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
272 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
273 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
274 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
275 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) {
276 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed");
277 return XFS_ERROR(EFSCORRUPTED);
278 }
279
280 /*
281 * Sanity check AG count, size fields against data size field
282 */
283 if (unlikely(
284 sbp->sb_dblocks == 0 ||
285 sbp->sb_dblocks >
286 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
287 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
288 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
289 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed");
290 return XFS_ERROR(EFSCORRUPTED);
291 }
292
293 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
294 ASSERT(sbp->sb_blocklog >= BBSHIFT);
295
296 #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
297 if (unlikely(
298 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
299 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
300 #else /* Limited by UINT_MAX of sectors */
301 if (unlikely(
302 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
303 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
304 #endif
305 xfs_fs_mount_cmn_err(flags,
306 "file system too large to be mounted on this system.");
307 return XFS_ERROR(E2BIG);
308 }
309
310 if (unlikely(sbp->sb_inprogress)) {
311 xfs_fs_mount_cmn_err(flags, "file system busy");
312 return XFS_ERROR(EFSCORRUPTED);
313 }
314
315 /*
316 * Version 1 directory format has never worked on Linux.
317 */
318 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
319 xfs_fs_mount_cmn_err(flags,
320 "file system using version 1 directory format");
321 return XFS_ERROR(ENOSYS);
322 }
323
324 /*
325 * Until this is fixed only page-sized or smaller data blocks work.
326 */
327 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
328 xfs_fs_mount_cmn_err(flags,
329 "file system with blocksize %d bytes",
330 sbp->sb_blocksize);
331 xfs_fs_mount_cmn_err(flags,
332 "only pagesize (%ld) or less will currently work.",
333 PAGE_SIZE);
334 return XFS_ERROR(ENOSYS);
335 }
336
337 return 0;
338 }
339
340 xfs_agnumber_t
341 xfs_initialize_perag(
342 struct xfs_vfs *vfs,
343 xfs_mount_t *mp,
344 xfs_agnumber_t agcount)
345 {
346 xfs_agnumber_t index, max_metadata;
347 xfs_perag_t *pag;
348 xfs_agino_t agino;
349 xfs_ino_t ino;
350 xfs_sb_t *sbp = &mp->m_sb;
351 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
352
353 /* Check to see if the filesystem can overflow 32 bit inodes */
354 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
355 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
356
357 /* Clear the mount flag if no inode can overflow 32 bits
358 * on this filesystem, or if specifically requested..
359 */
360 if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) {
361 mp->m_flags |= XFS_MOUNT_32BITINODES;
362 } else {
363 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
364 }
365
366 /* If we can overflow then setup the ag headers accordingly */
367 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
368 /* Calculate how much should be reserved for inodes to
369 * meet the max inode percentage.
370 */
371 if (mp->m_maxicount) {
372 __uint64_t icount;
373
374 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
375 do_div(icount, 100);
376 icount += sbp->sb_agblocks - 1;
377 do_div(icount, sbp->sb_agblocks);
378 max_metadata = icount;
379 } else {
380 max_metadata = agcount;
381 }
382 for (index = 0; index < agcount; index++) {
383 ino = XFS_AGINO_TO_INO(mp, index, agino);
384 if (ino > max_inum) {
385 index++;
386 break;
387 }
388
389 /* This ag is preferred for inodes */
390 pag = &mp->m_perag[index];
391 pag->pagi_inodeok = 1;
392 if (index < max_metadata)
393 pag->pagf_metadata = 1;
394 }
395 } else {
396 /* Setup default behavior for smaller filesystems */
397 for (index = 0; index < agcount; index++) {
398 pag = &mp->m_perag[index];
399 pag->pagi_inodeok = 1;
400 }
401 }
402 return index;
403 }
404
405 /*
406 * xfs_xlatesb
407 *
408 * data - on disk version of sb
409 * sb - a superblock
410 * dir - conversion direction: <0 - convert sb to buf
411 * >0 - convert buf to sb
412 * fields - which fields to copy (bitmask)
413 */
414 void
415 xfs_xlatesb(
416 void *data,
417 xfs_sb_t *sb,
418 int dir,
419 __int64_t fields)
420 {
421 xfs_caddr_t buf_ptr;
422 xfs_caddr_t mem_ptr;
423 xfs_sb_field_t f;
424 int first;
425 int size;
426
427 ASSERT(dir);
428 ASSERT(fields);
429
430 if (!fields)
431 return;
432
433 buf_ptr = (xfs_caddr_t)data;
434 mem_ptr = (xfs_caddr_t)sb;
435
436 while (fields) {
437 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
438 first = xfs_sb_info[f].offset;
439 size = xfs_sb_info[f + 1].offset - first;
440
441 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
442
443 if (size == 1 || xfs_sb_info[f].type == 1) {
444 if (dir > 0) {
445 memcpy(mem_ptr + first, buf_ptr + first, size);
446 } else {
447 memcpy(buf_ptr + first, mem_ptr + first, size);
448 }
449 } else {
450 switch (size) {
451 case 2:
452 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
453 *(__uint16_t*)(mem_ptr+first),
454 dir, ARCH_CONVERT);
455 break;
456 case 4:
457 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
458 *(__uint32_t*)(mem_ptr+first),
459 dir, ARCH_CONVERT);
460 break;
461 case 8:
462 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
463 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
464 break;
465 default:
466 ASSERT(0);
467 }
468 }
469
470 fields &= ~(1LL << f);
471 }
472 }
473
474 /*
475 * xfs_readsb
476 *
477 * Does the initial read of the superblock.
478 */
479 int
480 xfs_readsb(xfs_mount_t *mp, int flags)
481 {
482 unsigned int sector_size;
483 unsigned int extra_flags;
484 xfs_buf_t *bp;
485 xfs_sb_t *sbp;
486 int error;
487
488 ASSERT(mp->m_sb_bp == NULL);
489 ASSERT(mp->m_ddev_targp != NULL);
490
491 /*
492 * Allocate a (locked) buffer to hold the superblock.
493 * This will be kept around at all times to optimize
494 * access to the superblock.
495 */
496 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
497 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
498
499 bp = xfs_getsb(mp,0);
500
501 if (!bp || XFS_BUF_ISERROR(bp)) {
502 xfs_fs_mount_cmn_err(flags, "SB read failed");
503 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
504 goto fail;
505 }
506 ASSERT(XFS_BUF_ISBUSY(bp));
507 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
508
509 /*
510 * Initialize the mount structure from the superblock.
511 * But first do some basic consistency checking.
512 */
513 sbp = XFS_BUF_TO_SBP(bp);
514 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
515
516 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
517 if (error) {
518 xfs_fs_mount_cmn_err(flags, "SB validate failed");
519 goto fail;
520 }
521
522 /*
523 * We must be able to do sector-sized and sector-aligned IO.
524 */
525 if (sector_size > mp->m_sb.sb_sectsize) {
526 xfs_fs_mount_cmn_err(flags,
527 "device supports only %u byte sectors (not %u)",
528 sector_size, mp->m_sb.sb_sectsize);
529 error = ENOSYS;
530 goto fail;
531 }
532
533 /*
534 * If device sector size is smaller than the superblock size,
535 * re-read the superblock so the buffer is correctly sized.
536 */
537 if (sector_size < mp->m_sb.sb_sectsize) {
538 XFS_BUF_UNMANAGE(bp);
539 xfs_buf_relse(bp);
540 sector_size = mp->m_sb.sb_sectsize;
541 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
542 BTOBB(sector_size), extra_flags);
543 if (!bp || XFS_BUF_ISERROR(bp)) {
544 xfs_fs_mount_cmn_err(flags, "SB re-read failed");
545 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
546 goto fail;
547 }
548 ASSERT(XFS_BUF_ISBUSY(bp));
549 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
550 }
551
552 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
553 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
554 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
555
556 mp->m_sb_bp = bp;
557 xfs_buf_relse(bp);
558 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
559 return 0;
560
561 fail:
562 if (bp) {
563 XFS_BUF_UNMANAGE(bp);
564 xfs_buf_relse(bp);
565 }
566 return error;
567 }
568
569
570 /*
571 * xfs_mount_common
572 *
573 * Mount initialization code establishing various mount
574 * fields from the superblock associated with the given
575 * mount structure
576 */
577 STATIC void
578 xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
579 {
580 int i;
581
582 mp->m_agfrotor = mp->m_agirotor = 0;
583 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
584 mp->m_maxagi = mp->m_sb.sb_agcount;
585 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
586 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
587 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
588 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
589 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
590 mp->m_litino = sbp->sb_inodesize -
591 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
592 mp->m_blockmask = sbp->sb_blocksize - 1;
593 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
594 mp->m_blockwmask = mp->m_blockwsize - 1;
595 #ifdef RMC
596 INIT_LIST_HEAD(&mp->m_del_inodes);
597 #endif
598 TAILQ_INIT(&mp->m_del_inodes);
599
600 /*
601 * Setup for attributes, in case they get created.
602 * This value is for inodes getting attributes for the first time,
603 * the per-inode value is for old attribute values.
604 */
605 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
606 switch (sbp->sb_inodesize) {
607 case 256:
608 mp->m_attroffset = XFS_LITINO(mp) -
609 XFS_BMDR_SPACE_CALC(MINABTPTRS);
610 break;
611 case 512:
612 case 1024:
613 case 2048:
614 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
615 break;
616 default:
617 ASSERT(0);
618 }
619 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
620
621 for (i = 0; i < 2; i++) {
622 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
623 xfs_alloc, i == 0);
624 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
625 xfs_alloc, i == 0);
626 }
627 for (i = 0; i < 2; i++) {
628 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
629 xfs_bmbt, i == 0);
630 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
631 xfs_bmbt, i == 0);
632 }
633 for (i = 0; i < 2; i++) {
634 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
635 xfs_inobt, i == 0);
636 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
637 xfs_inobt, i == 0);
638 }
639
640 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
641 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
642 sbp->sb_inopblock);
643 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
644 }
645 /*
646 * xfs_mountfs
647 *
648 * This function does the following on an initial mount of a file system:
649 * - reads the superblock from disk and init the mount struct
650 * - if we're a 32-bit kernel, do a size check on the superblock
651 * so we don't mount terabyte filesystems
652 * - init mount struct realtime fields
653 * - allocate inode hash table for fs
654 * - init directory manager
655 * - perform recovery and init the log manager
656 */
657 int
658 xfs_mountfs(
659 xfs_vfs_t *vfsp,
660 xfs_mount_t *mp,
661 int mfsi_flags)
662 {
663 xfs_buf_t *bp;
664 xfs_sb_t *sbp = &(mp->m_sb);
665 xfs_inode_t *rip;
666 xfs_vnode_t *rvp = NULL;
667 int readio_log, writeio_log;
668 xfs_daddr_t d;
669 __uint64_t ret64;
670 __int64_t update_flags;
671 uint quotamount, quotaflags;
672 int agno;
673 int uuid_mounted = 0;
674 int error = 0;
675
676 if (mp->m_sb_bp == NULL) {
677 if ((error = xfs_readsb(mp, mfsi_flags))) {
678 return error;
679 }
680 }
681 xfs_mount_common(mp, sbp);
682
683 /*
684 * Check if sb_agblocks is aligned at stripe boundary
685 * If sb_agblocks is NOT aligned turn off m_dalign since
686 * allocator alignment is within an ag, therefore ag has
687 * to be aligned at stripe boundary.
688 */
689 update_flags = 0LL;
690 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
691 /*
692 * If stripe unit and stripe width are not multiples
693 * of the fs blocksize turn off alignment.
694 */
695 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
696 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
697 if (mp->m_flags & XFS_MOUNT_RETERR) {
698 cmn_err(CE_WARN,
699 "XFS: alignment check 1 failed");
700 error = XFS_ERROR(EINVAL);
701 goto error1;
702 }
703 mp->m_dalign = mp->m_swidth = 0;
704 } else {
705 /*
706 * Convert the stripe unit and width to FSBs.
707 */
708 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
709 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
710 if (mp->m_flags & XFS_MOUNT_RETERR) {
711 error = XFS_ERROR(EINVAL);
712 goto error1;
713 }
714 xfs_fs_cmn_err(CE_WARN, mp,
715 "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
716 mp->m_dalign, mp->m_swidth,
717 sbp->sb_agblocks);
718
719 mp->m_dalign = 0;
720 mp->m_swidth = 0;
721 } else if (mp->m_dalign) {
722 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
723 } else {
724 if (mp->m_flags & XFS_MOUNT_RETERR) {
725 xfs_fs_cmn_err(CE_WARN, mp,
726 "stripe alignment turned off: sunit(%d) less than bsize(%d)",
727 mp->m_dalign,
728 mp->m_blockmask +1);
729 error = XFS_ERROR(EINVAL);
730 goto error1;
731 }
732 mp->m_swidth = 0;
733 }
734 }
735
736 /*
737 * Update superblock with new values
738 * and log changes
739 */
740 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
741 if (sbp->sb_unit != mp->m_dalign) {
742 sbp->sb_unit = mp->m_dalign;
743 update_flags |= XFS_SB_UNIT;
744 }
745 if (sbp->sb_width != mp->m_swidth) {
746 sbp->sb_width = mp->m_swidth;
747 update_flags |= XFS_SB_WIDTH;
748 }
749 }
750 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
751 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
752 mp->m_dalign = sbp->sb_unit;
753 mp->m_swidth = sbp->sb_width;
754 }
755
756 xfs_alloc_compute_maxlevels(mp);
757 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
758 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
759 xfs_ialloc_compute_maxlevels(mp);
760
761 if (sbp->sb_imax_pct) {
762 __uint64_t icount;
763
764 /* Make sure the maximum inode count is a multiple of the
765 * units we allocate inodes in.
766 */
767
768 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
769 do_div(icount, 100);
770 do_div(icount, mp->m_ialloc_blks);
771 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
772 sbp->sb_inopblog;
773 } else
774 mp->m_maxicount = 0;
775
776 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
777
778 /*
779 * XFS uses the uuid from the superblock as the unique
780 * identifier for fsid. We can not use the uuid from the volume
781 * since a single partition filesystem is identical to a single
782 * partition volume/filesystem.
783 */
784 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
785 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
786 if (xfs_uuid_mount(mp)) {
787 error = XFS_ERROR(EINVAL);
788 goto error1;
789 }
790 uuid_mounted=1;
791 ret64 = uuid_hash64(&sbp->sb_uuid);
792 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
793 }
794
795 /*
796 * Set the default minimum read and write sizes unless
797 * already specified in a mount option.
798 * We use smaller I/O sizes when the file system
799 * is being used for NFS service (wsync mount option).
800 */
801 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
802 if (mp->m_flags & XFS_MOUNT_WSYNC) {
803 readio_log = XFS_WSYNC_READIO_LOG;
804 writeio_log = XFS_WSYNC_WRITEIO_LOG;
805 } else {
806 readio_log = XFS_READIO_LOG_LARGE;
807 writeio_log = XFS_WRITEIO_LOG_LARGE;
808 }
809 } else {
810 readio_log = mp->m_readio_log;
811 writeio_log = mp->m_writeio_log;
812 }
813
814 /*
815 * Set the number of readahead buffers to use based on
816 * physical memory size.
817 */
818 if (xfs_physmem <= 4096) /* <= 16MB */
819 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
820 else if (xfs_physmem <= 8192) /* <= 32MB */
821 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
822 else
823 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
824 if (sbp->sb_blocklog > readio_log) {
825 mp->m_readio_log = sbp->sb_blocklog;
826 } else {
827 mp->m_readio_log = readio_log;
828 }
829 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
830 if (sbp->sb_blocklog > writeio_log) {
831 mp->m_writeio_log = sbp->sb_blocklog;
832 } else {
833 mp->m_writeio_log = writeio_log;
834 }
835 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
836
837 /*
838 * Set the inode cluster size based on the physical memory
839 * size. This may still be overridden by the file system
840 * block size if it is larger than the chosen cluster size.
841 */
842 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
843 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
844 } else {
845 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
846 }
847 /*
848 * Set whether we're using inode alignment.
849 */
850 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
851 mp->m_sb.sb_inoalignmt >=
852 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
853 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
854 else
855 mp->m_inoalign_mask = 0;
856 /*
857 * If we are using stripe alignment, check whether
858 * the stripe unit is a multiple of the inode alignment
859 */
860 if (mp->m_dalign && mp->m_inoalign_mask &&
861 !(mp->m_dalign & mp->m_inoalign_mask))
862 mp->m_sinoalign = mp->m_dalign;
863 else
864 mp->m_sinoalign = 0;
865 /*
866 * Check that the data (and log if separate) are an ok size.
867 */
868 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
869 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
870 cmn_err(CE_WARN, "XFS: size check 1 failed");
871 error = XFS_ERROR(E2BIG);
872 goto error1;
873 }
874 error = xfs_read_buf(mp, mp->m_ddev_targp,
875 d - XFS_FSS_TO_BB(mp, 1),
876 XFS_FSS_TO_BB(mp, 1), 0, &bp);
877 if (!error) {
878 xfs_buf_relse(bp);
879 } else {
880 cmn_err(CE_WARN, "XFS: size check 2 failed");
881 if (error == ENOSPC) {
882 error = XFS_ERROR(E2BIG);
883 }
884 goto error1;
885 }
886
887 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
888 mp->m_logdev_targp != mp->m_ddev_targp) {
889 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
890 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
891 cmn_err(CE_WARN, "XFS: size check 3 failed");
892 error = XFS_ERROR(E2BIG);
893 goto error1;
894 }
895 error = xfs_read_buf(mp, mp->m_logdev_targp,
896 d - XFS_FSB_TO_BB(mp, 1),
897 XFS_FSB_TO_BB(mp, 1), 0, &bp);
898 if (!error) {
899 xfs_buf_relse(bp);
900 } else {
901 cmn_err(CE_WARN, "XFS: size check 3 failed");
902 if (error == ENOSPC) {
903 error = XFS_ERROR(E2BIG);
904 }
905 goto error1;
906 }
907 }
908
909 /*
910 * Initialize realtime fields in the mount structure
911 */
912 if ((error = xfs_rtmount_init(mp))) {
913 cmn_err(CE_WARN, "XFS: RT mount failed");
914 goto error1;
915 }
916
917 /*
918 * For client case we are done now
919 */
920 if (mfsi_flags & XFS_MFSI_CLIENT) {
921 return 0;
922 }
923
924 /*
925 * Copies the low order bits of the timestamp and the randomly
926 * set "sequence" number out of a UUID.
927 */
928 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
929
930 /*
931 * The vfs structure needs to have a file system independent
932 * way of checking for the invariant file system ID. Since it
933 * can't look at mount structures it has a pointer to the data
934 * in the mount structure.
935 *
936 * File systems that don't support user level file handles (i.e.
937 * all of them except for XFS) will leave vfs_altfsid as NULL.
938 */
939 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
940 mp->m_dmevmask = 0; /* not persistent; set after each mount */
941
942 /*
943 * Select the right directory manager.
944 */
945 mp->m_dirops =
946 XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
947 xfsv2_dirops :
948 xfsv1_dirops;
949
950 /*
951 * Initialize directory manager's entries.
952 */
953 XFS_DIR_MOUNT(mp);
954
955 /*
956 * Initialize the attribute manager's entries.
957 */
958 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
959
960 /*
961 * Initialize the precomputed transaction reservations values.
962 */
963 xfs_trans_init(mp);
964
965 /*
966 * Allocate and initialize the inode hash table for this
967 * file system.
968 */
969 xfs_ihash_init(mp);
970 xfs_chash_init(mp);
971
972 /*
973 * Allocate and initialize the per-ag data.
974 */
975 init_rwsem(&mp->m_peraglock);
976 mp->m_perag =
977 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
978
979 mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount);
980
981 /*
982 * log's mount-time initialization. Perform 1st part recovery if needed
983 */
984 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
985 error = xfs_log_mount(mp, mp->m_logdev_targp,
986 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
987 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
988 if (error) {
989 cmn_err(CE_WARN, "XFS: log mount failed");
990 goto error2;
991 }
992 } else { /* No log has been defined */
993 cmn_err(CE_WARN, "XFS: no log defined");
994 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
995 error = XFS_ERROR(EFSCORRUPTED);
996 goto error2;
997 }
998
999 /*
1000 * Get and sanity-check the root inode.
1001 * Save the pointer to it in the mount structure.
1002 */
1003 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
1004 if (error) {
1005 cmn_err(CE_WARN, "XFS: failed to read root inode");
1006 goto error3;
1007 }
1008
1009 ASSERT(rip != NULL);
1010 rvp = XFS_ITOV(rip);
1011
1012 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
1013 cmn_err(CE_WARN, "XFS: corrupted root inode");
1014 printf("Root inode %p is not a directory: %llu",
1015 mp->m_ddev_targp, (unsigned long long)rip->i_ino);
1016 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1017 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
1018 mp);
1019 error = XFS_ERROR(EFSCORRUPTED);
1020 goto error4;
1021 }
1022 mp->m_rootip = rip; /* save it */
1023
1024 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1025
1026 /*
1027 * Initialize realtime inode pointers in the mount structure
1028 */
1029 if ((error = xfs_rtmount_inodes(mp))) {
1030 /*
1031 * Free up the root inode.
1032 */
1033 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1034 goto error4;
1035 }
1036
1037 /*
1038 * If fs is not mounted readonly, then update the superblock
1039 * unit and width changes.
1040 */
1041 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1042 xfs_mount_log_sbunit(mp, update_flags);
1043
1044 /*
1045 * Initialise the XFS quota management subsystem for this mount
1046 */
1047 if ((error = XFS_QM_INIT(mp, "amount, "aflags)))
1048 goto error4;
1049
1050 /*
1051 * Finish recovering the file system. This part needed to be
1052 * delayed until after the root and real-time bitmap inodes
1053 * were consistently read in.
1054 */
1055 error = xfs_log_mount_finish(mp, mfsi_flags);
1056 if (error) {
1057 cmn_err(CE_WARN, "XFS: log mount finish failed");
1058 goto error4;
1059 }
1060
1061 /*
1062 * Complete the quota initialisation, post-log-replay component.
1063 */
1064 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1065 goto error4;
1066
1067 return 0;
1068
1069 error4:
1070 /*
1071 * Free up the root inode.
1072 */
1073 VN_RELE(rvp);
1074 error3:
1075 xfs_log_unmount_dealloc(mp);
1076 error2:
1077 xfs_ihash_free(mp);
1078 xfs_chash_free(mp);
1079 for (agno = 0; agno < sbp->sb_agcount; agno++)
1080 if (mp->m_perag[agno].pagb_list)
1081 kmem_free(mp->m_perag[agno].pagb_list,
1082 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1083 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1084 mp->m_perag = NULL;
1085 /* FALLTHROUGH */
1086 error1:
1087 if (uuid_mounted)
1088 xfs_uuid_unmount(mp);
1089 xfs_freesb(mp);
1090 return error;
1091 }
1092
1093 /*
1094 * xfs_unmountfs
1095 *
1096 * This flushes out the inodes,dquots and the superblock, unmounts the
1097 * log and makes sure that incore structures are freed.
1098 */
1099 int
1100 xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1101 {
1102 struct xfs_vfs *vfsp = XFS_MTOVFS(mp);
1103 #if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1104 int64_t fsid;
1105 #endif
1106
1107 xfs_iflush_all(mp);
1108
1109 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
1110
1111 /*
1112 * Flush out the log synchronously so that we know for sure
1113 * that nothing is pinned. This is important because bflush()
1114 * will skip pinned buffers.
1115 */
1116 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1117
1118 xfs_binval(mp->m_ddev_targp);
1119 if (mp->m_rtdev_targp) {
1120 xfs_binval(mp->m_rtdev_targp);
1121 }
1122
1123 xfs_unmountfs_writesb(mp);
1124
1125 xfs_unmountfs_wait(mp); /* wait for async bufs */
1126
1127 xfs_log_unmount(mp); /* Done! No more fs ops. */
1128
1129 xfs_freesb(mp);
1130
1131 /*
1132 * All inodes from this mount point should be freed.
1133 */
1134 //ASSERT(mp->m_inodes == NULL);
1135 if (mp->m_inodes != NULL ) {
1136 printf("WRONG: mp->m_ireclaims: %d\n", mp->m_ireclaims);
1137 printf("WRONG: mp->m_inodes: %p\n", mp->m_inodes);
1138 }
1139
1140 xfs_unmountfs_close(mp, cr);
1141 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1142 xfs_uuid_unmount(mp);
1143
1144 #if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1145 /*
1146 * clear all error tags on this filesystem
1147 */
1148 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1149 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1150 #endif
1151 XFS_IODONE(vfsp);
1152 xfs_mount_free(mp, 1);
1153 return 0;
1154 }
1155
1156 void
1157 xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1158 {
1159 if (mp->m_logdev_targp != mp->m_ddev_targp)
1160 xfs_free_buftarg(mp->m_logdev_targp, 1);
1161 if (mp->m_rtdev_targp)
1162 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1163 xfs_free_buftarg(mp->m_ddev_targp, 0);
1164 }
1165
1166 STATIC void
1167 xfs_unmountfs_wait(xfs_mount_t *mp)
1168 {
1169 if (mp->m_logdev_targp != mp->m_ddev_targp)
1170 xfs_wait_buftarg(mp->m_logdev_targp);
1171 if (mp->m_rtdev_targp)
1172 xfs_wait_buftarg(mp->m_rtdev_targp);
1173 xfs_wait_buftarg(mp->m_ddev_targp);
1174 }
1175
1176 int
1177 xfs_unmountfs_writesb(xfs_mount_t *mp)
1178 {
1179 xfs_buf_t *sbp;
1180 xfs_sb_t *sb;
1181 int error = 0;
1182
1183 /*
1184 * skip superblock write if fs is read-only, or
1185 * if we are doing a forced umount.
1186 */
1187 sbp = xfs_getsb(mp, 0);
1188 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1189 XFS_FORCED_SHUTDOWN(mp))) {
1190
1191 xfs_icsb_sync_counters(mp);
1192
1193 /*
1194 * mark shared-readonly if desired
1195 */
1196 sb = XFS_BUF_TO_SBP(sbp);
1197 if (mp->m_mk_sharedro) {
1198 if (!(sb->sb_flags & XFS_SBF_READONLY))
1199 sb->sb_flags |= XFS_SBF_READONLY;
1200 if (!XFS_SB_VERSION_HASSHARED(sb))
1201 XFS_SB_VERSION_ADDSHARED(sb);
1202 xfs_fs_cmn_err(CE_NOTE, mp,
1203 "Unmounting, marking shared read-only");
1204 }
1205 XFS_BUF_UNDONE(sbp);
1206 XFS_BUF_UNREAD(sbp);
1207 XFS_BUF_UNDELAYWRITE(sbp);
1208 XFS_BUF_WRITE(sbp);
1209 XFS_BUF_UNASYNC(sbp);
1210 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1211 xfsbdstrat(mp, sbp);
1212 /* Nevermind errors we might get here. */
1213 error = xfs_iowait(sbp);
1214 if (error)
1215 xfs_ioerror_alert("xfs_unmountfs_writesb",
1216 mp, sbp, XFS_BUF_ADDR(sbp));
1217 if (error && mp->m_mk_sharedro)
1218 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1219 }
1220 xfs_buf_relse(sbp);
1221 return error;
1222 }
1223
1224 /*
1225 * xfs_mod_sb() can be used to copy arbitrary changes to the
1226 * in-core superblock into the superblock buffer to be logged.
1227 * It does not provide the higher level of locking that is
1228 * needed to protect the in-core superblock from concurrent
1229 * access.
1230 */
1231 void
1232 xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1233 {
1234 xfs_buf_t *bp;
1235 int first;
1236 int last;
1237 xfs_mount_t *mp;
1238 xfs_sb_t *sbp;
1239 xfs_sb_field_t f;
1240
1241 ASSERT(fields);
1242 if (!fields)
1243 return;
1244 mp = tp->t_mountp;
1245 bp = xfs_trans_getsb(tp, mp, 0);
1246 sbp = XFS_BUF_TO_SBP(bp);
1247 first = sizeof(xfs_sb_t);
1248 last = 0;
1249
1250 /* translate/copy */
1251
1252 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1253
1254 /* find modified range */
1255
1256 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1257 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1258 first = xfs_sb_info[f].offset;
1259
1260 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1261 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1262 last = xfs_sb_info[f + 1].offset - 1;
1263
1264 xfs_trans_log_buf(tp, bp, first, last);
1265 }
1266 /*
1267 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1268 * a delta to a specified field in the in-core superblock. Simply
1269 * switch on the field indicated and apply the delta to that field.
1270 * Fields are not allowed to dip below zero, so if the delta would
1271 * do this do not apply it and return EINVAL.
1272 *
1273 * The SB_LOCK must be held when this routine is called.
1274 */
1275 int
1276 xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
1277 int delta, int rsvd)
1278 {
1279 int scounter; /* short counter for 32 bit fields */
1280 long long lcounter; /* long counter for 64 bit fields */
1281 long long res_used, rem;
1282
1283 /*
1284 * With the in-core superblock spin lock held, switch
1285 * on the indicated field. Apply the delta to the
1286 * proper field. If the fields value would dip below
1287 * 0, then do not apply the delta and return EINVAL.
1288 */
1289 switch (field) {
1290 case XFS_SBS_ICOUNT:
1291 lcounter = (long long)mp->m_sb.sb_icount;
1292 lcounter += delta;
1293 if (lcounter < 0) {
1294 ASSERT(0);
1295 return XFS_ERROR(EINVAL);
1296 }
1297 mp->m_sb.sb_icount = lcounter;
1298 return 0;
1299 case XFS_SBS_IFREE:
1300 lcounter = (long long)mp->m_sb.sb_ifree;
1301 lcounter += delta;
1302 if (lcounter < 0) {
1303 ASSERT(0);
1304 return XFS_ERROR(EINVAL);
1305 }
1306 mp->m_sb.sb_ifree = lcounter;
1307 return 0;
1308 case XFS_SBS_FDBLOCKS:
1309
1310 lcounter = (long long)mp->m_sb.sb_fdblocks;
1311 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1312
1313 if (delta > 0) { /* Putting blocks back */
1314 if (res_used > delta) {
1315 mp->m_resblks_avail += delta;
1316 } else {
1317 rem = delta - res_used;
1318 mp->m_resblks_avail = mp->m_resblks;
1319 lcounter += rem;
1320 }
1321 } else { /* Taking blocks away */
1322
1323 lcounter += delta;
1324
1325 /*
1326 * If were out of blocks, use any available reserved blocks if
1327 * were allowed to.
1328 */
1329
1330 if (lcounter < 0) {
1331 if (rsvd) {
1332 lcounter = (long long)mp->m_resblks_avail + delta;
1333 if (lcounter < 0) {
1334 return XFS_ERROR(ENOSPC);
1335 }
1336 mp->m_resblks_avail = lcounter;
1337 return 0;
1338 } else { /* not reserved */
1339 return XFS_ERROR(ENOSPC);
1340 }
1341 }
1342 }
1343
1344 mp->m_sb.sb_fdblocks = lcounter;
1345 return 0;
1346 case XFS_SBS_FREXTENTS:
1347 lcounter = (long long)mp->m_sb.sb_frextents;
1348 lcounter += delta;
1349 if (lcounter < 0) {
1350 return XFS_ERROR(ENOSPC);
1351 }
1352 mp->m_sb.sb_frextents = lcounter;
1353 return 0;
1354 case XFS_SBS_DBLOCKS:
1355 lcounter = (long long)mp->m_sb.sb_dblocks;
1356 lcounter += delta;
1357 if (lcounter < 0) {
1358 ASSERT(0);
1359 return XFS_ERROR(EINVAL);
1360 }
1361 mp->m_sb.sb_dblocks = lcounter;
1362 return 0;
1363 case XFS_SBS_AGCOUNT:
1364 scounter = mp->m_sb.sb_agcount;
1365 scounter += delta;
1366 if (scounter < 0) {
1367 ASSERT(0);
1368 return XFS_ERROR(EINVAL);
1369 }
1370 mp->m_sb.sb_agcount = scounter;
1371 return 0;
1372 case XFS_SBS_IMAX_PCT:
1373 scounter = mp->m_sb.sb_imax_pct;
1374 scounter += delta;
1375 if (scounter < 0) {
1376 ASSERT(0);
1377 return XFS_ERROR(EINVAL);
1378 }
1379 mp->m_sb.sb_imax_pct = scounter;
1380 return 0;
1381 case XFS_SBS_REXTSIZE:
1382 scounter = mp->m_sb.sb_rextsize;
1383 scounter += delta;
1384 if (scounter < 0) {
1385 ASSERT(0);
1386 return XFS_ERROR(EINVAL);
1387 }
1388 mp->m_sb.sb_rextsize = scounter;
1389 return 0;
1390 case XFS_SBS_RBMBLOCKS:
1391 scounter = mp->m_sb.sb_rbmblocks;
1392 scounter += delta;
1393 if (scounter < 0) {
1394 ASSERT(0);
1395 return XFS_ERROR(EINVAL);
1396 }
1397 mp->m_sb.sb_rbmblocks = scounter;
1398 return 0;
1399 case XFS_SBS_RBLOCKS:
1400 lcounter = (long long)mp->m_sb.sb_rblocks;
1401 lcounter += delta;
1402 if (lcounter < 0) {
1403 ASSERT(0);
1404 return XFS_ERROR(EINVAL);
1405 }
1406 mp->m_sb.sb_rblocks = lcounter;
1407 return 0;
1408 case XFS_SBS_REXTENTS:
1409 lcounter = (long long)mp->m_sb.sb_rextents;
1410 lcounter += delta;
1411 if (lcounter < 0) {
1412 ASSERT(0);
1413 return XFS_ERROR(EINVAL);
1414 }
1415 mp->m_sb.sb_rextents = lcounter;
1416 return 0;
1417 case XFS_SBS_REXTSLOG:
1418 scounter = mp->m_sb.sb_rextslog;
1419 scounter += delta;
1420 if (scounter < 0) {
1421 ASSERT(0);
1422 return XFS_ERROR(EINVAL);
1423 }
1424 mp->m_sb.sb_rextslog = scounter;
1425 return 0;
1426 default:
1427 ASSERT(0);
1428 return XFS_ERROR(EINVAL);
1429 }
1430 }
1431
1432 /*
1433 * xfs_mod_incore_sb() is used to change a field in the in-core
1434 * superblock structure by the specified delta. This modification
1435 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1436 * routine to do the work.
1437 */
1438 int
1439 xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
1440 {
1441 unsigned long s;
1442 int status;
1443
1444 /* check for per-cpu counters */
1445 switch (field) {
1446 #ifdef HAVE_PERCPU_SB
1447 case XFS_SBS_ICOUNT:
1448 case XFS_SBS_IFREE:
1449 case XFS_SBS_FDBLOCKS:
1450 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1451 status = xfs_icsb_modify_counters(mp, field,
1452 delta, rsvd);
1453 break;
1454 }
1455 /* FALLTHROUGH */
1456 #endif
1457 default:
1458 s = XFS_SB_LOCK(mp);
1459 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1460 XFS_SB_UNLOCK(mp, s);
1461 break;
1462 }
1463
1464 return status;
1465 }
1466
1467 /*
1468 * xfs_mod_incore_sb_batch() is used to change more than one field
1469 * in the in-core superblock structure at a time. This modification
1470 * is protected by a lock internal to this module. The fields and
1471 * changes to those fields are specified in the array of xfs_mod_sb
1472 * structures passed in.
1473 *
1474 * Either all of the specified deltas will be applied or none of
1475 * them will. If any modified field dips below 0, then all modifications
1476 * will be backed out and EINVAL will be returned.
1477 */
1478 int
1479 xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1480 {
1481 unsigned long s;
1482 int status=0;
1483 xfs_mod_sb_t *msbp;
1484
1485 /*
1486 * Loop through the array of mod structures and apply each
1487 * individually. If any fail, then back out all those
1488 * which have already been applied. Do all of this within
1489 * the scope of the SB_LOCK so that all of the changes will
1490 * be atomic.
1491 */
1492 s = XFS_SB_LOCK(mp);
1493 msbp = &msb[0];
1494 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1495 /*
1496 * Apply the delta at index n. If it fails, break
1497 * from the loop so we'll fall into the undo loop
1498 * below.
1499 */
1500 switch (msbp->msb_field) {
1501 #ifdef HAVE_PERCPU_SB
1502 case XFS_SBS_ICOUNT:
1503 case XFS_SBS_IFREE:
1504 case XFS_SBS_FDBLOCKS:
1505 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1506 status = xfs_icsb_modify_counters_locked(mp,
1507 msbp->msb_field,
1508 msbp->msb_delta, rsvd);
1509 break;
1510 }
1511 /* FALLTHROUGH */
1512 #endif
1513 default:
1514 status = xfs_mod_incore_sb_unlocked(mp,
1515 msbp->msb_field,
1516 msbp->msb_delta, rsvd);
1517 break;
1518 }
1519
1520 if (status != 0) {
1521 break;
1522 }
1523 }
1524
1525 /*
1526 * If we didn't complete the loop above, then back out
1527 * any changes made to the superblock. If you add code
1528 * between the loop above and here, make sure that you
1529 * preserve the value of status. Loop back until
1530 * we step below the beginning of the array. Make sure
1531 * we don't touch anything back there.
1532 */
1533 if (status != 0) {
1534 msbp--;
1535 while (msbp >= msb) {
1536 switch (msbp->msb_field) {
1537 #ifdef HAVE_PERCPU_SB
1538 case XFS_SBS_ICOUNT:
1539 case XFS_SBS_IFREE:
1540 case XFS_SBS_FDBLOCKS:
1541 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1542 status =
1543 xfs_icsb_modify_counters_locked(mp,
1544 msbp->msb_field,
1545 -(msbp->msb_delta),
1546 rsvd);
1547 break;
1548 }
1549 /* FALLTHROUGH */
1550 #endif
1551 default:
1552 status = xfs_mod_incore_sb_unlocked(mp,
1553 msbp->msb_field,
1554 -(msbp->msb_delta),
1555 rsvd);
1556 break;
1557 }
1558 ASSERT(status == 0);
1559 msbp--;
1560 }
1561 }
1562 XFS_SB_UNLOCK(mp, s);
1563 return status;
1564 }
1565
1566 /*
1567 * xfs_getsb() is called to obtain the buffer for the superblock.
1568 * The buffer is returned locked and read in from disk.
1569 * The buffer should be released with a call to xfs_brelse().
1570 *
1571 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1572 * the superblock buffer if it can be locked without sleeping.
1573 * If it can't then we'll return NULL.
1574 */
1575 xfs_buf_t *
1576 xfs_getsb(
1577 xfs_mount_t *mp,
1578 int flags)
1579 {
1580 xfs_buf_t *bp;
1581 int extra_flags = 0;
1582 unsigned int sector_size;
1583
1584
1585 bp = mp->m_sb_bp;
1586 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
1587 #ifdef NOT
1588 /* MANAGED buf's appear broken in FreeBSD
1589 * but it's unclear if we need a persistant superblock?
1590 * since we now translate the ondisk superblock to
1591 * a separate translated structure and then translate that
1592 * structure back when we want to write the superblock
1593 */
1594 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
1595 extra_flags = XFS_BUF_MANAGE;
1596 #endif
1597
1598 mp->m_sb_bp = bp
1599 = xfs_buf_read_flags(mp->m_ddev_targp,
1600 XFS_SB_DADDR,
1601 BTOBB(sector_size),
1602 extra_flags);
1603
1604 XFS_BUF_HOLD(bp);
1605 ASSERT(XFS_BUF_ISDONE(bp));
1606 if (!XFS_BUF_ISDONE(bp)){
1607 printf("xfs_getsb: %p bp flags 0x%x\n",bp,bp->b_flags);
1608 }
1609 return bp;
1610 }
1611
1612 /*
1613 * Used to free the superblock along various error paths.
1614 */
1615 void
1616 xfs_freesb(
1617 xfs_mount_t *mp)
1618 {
1619 xfs_buf_t *bp;
1620
1621 /*
1622 * Use xfs_getsb() so that the buffer will be locked
1623 * when we call xfs_buf_relse().
1624 */
1625 bp = xfs_getsb(mp, 0);
1626 XFS_BUF_UNMANAGE(bp);
1627 xfs_buf_relse(bp);
1628 mp->m_sb_bp = NULL;
1629 }
1630
1631 /*
1632 * See if the UUID is unique among mounted XFS filesystems.
1633 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1634 */
1635 STATIC int
1636 xfs_uuid_mount(
1637 xfs_mount_t *mp)
1638 {
1639 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1640 cmn_err(CE_WARN,
1641 "XFS: Filesystem %s has nil UUID - can't mount",
1642 mp->m_fsname);
1643 return -1;
1644 }
1645 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1646 cmn_err(CE_WARN,
1647 "XFS: Filesystem %s has duplicate UUID - can't mount",
1648 mp->m_fsname);
1649 return -1;
1650 }
1651 return 0;
1652 }
1653
1654 /*
1655 * Remove filesystem from the UUID table.
1656 */
1657 STATIC void
1658 xfs_uuid_unmount(
1659 xfs_mount_t *mp)
1660 {
1661 uuid_table_remove(&mp->m_sb.sb_uuid);
1662 }
1663
1664 /*
1665 * Used to log changes to the superblock unit and width fields which could
1666 * be altered by the mount options. Only the first superblock is updated.
1667 */
1668 STATIC void
1669 xfs_mount_log_sbunit(
1670 xfs_mount_t *mp,
1671 __int64_t fields)
1672 {
1673 xfs_trans_t *tp;
1674
1675 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1676
1677 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1678 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1679 XFS_DEFAULT_LOG_COUNT)) {
1680 xfs_trans_cancel(tp, 0);
1681 return;
1682 }
1683 xfs_mod_sb(tp, fields);
1684 xfs_trans_commit(tp, 0, NULL);
1685 }
1686
1687
1688 #ifdef HAVE_PERCPU_SB
1689 /*
1690 * Per-cpu incore superblock counters
1691 *
1692 * Simple concept, difficult implementation
1693 *
1694 * Basically, replace the incore superblock counters with a distributed per cpu
1695 * counter for contended fields (e.g. free block count).
1696 *
1697 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1698 * hence needs to be accurately read when we are running low on space. Hence
1699 * there is a method to enable and disable the per-cpu counters based on how
1700 * much "stuff" is available in them.
1701 *
1702 * Basically, a counter is enabled if there is enough free resource to justify
1703 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1704 * ENOSPC), then we disable the counters to synchronise all callers and
1705 * re-distribute the available resources.
1706 *
1707 * If, once we redistributed the available resources, we still get a failure,
1708 * we disable the per-cpu counter and go through the slow path.
1709 *
1710 * The slow path is the current xfs_mod_incore_sb() function. This means that
1711 * when we disable a per-cpu counter, we need to drain it's resources back to
1712 * the global superblock. We do this after disabling the counter to prevent
1713 * more threads from queueing up on the counter.
1714 *
1715 * Essentially, this means that we still need a lock in the fast path to enable
1716 * synchronisation between the global counters and the per-cpu counters. This
1717 * is not a problem because the lock will be local to a CPU almost all the time
1718 * and have little contention except when we get to ENOSPC conditions.
1719 *
1720 * Basically, this lock becomes a barrier that enables us to lock out the fast
1721 * path while we do things like enabling and disabling counters and
1722 * synchronising the counters.
1723 *
1724 * Locking rules:
1725 *
1726 * 1. XFS_SB_LOCK() before picking up per-cpu locks
1727 * 2. per-cpu locks always picked up via for_each_online_cpu() order
1728 * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks
1729 * 4. modifying per-cpu counters requires holding per-cpu lock
1730 * 5. modifying global counters requires holding XFS_SB_LOCK
1731 * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK
1732 * and _none_ of the per-cpu locks.
1733 *
1734 * Disabled counters are only ever re-enabled by a balance operation
1735 * that results in more free resources per CPU than a given threshold.
1736 * To ensure counters don't remain disabled, they are rebalanced when
1737 * the global resource goes above a higher threshold (i.e. some hysteresis
1738 * is present to prevent thrashing).
1739 */
1740
1741 /*
1742 * hot-plug CPU notifier support.
1743 *
1744 * We cannot use the hotcpu_register() function because it does
1745 * not allow notifier instances. We need a notifier per filesystem
1746 * as we need to be able to identify the filesystem to balance
1747 * the counters out. This is achieved by having a notifier block
1748 * embedded in the xfs_mount_t and doing pointer magic to get the
1749 * mount pointer from the notifier block address.
1750 */
1751 STATIC int
1752 xfs_icsb_cpu_notify(
1753 struct notifier_block *nfb,
1754 unsigned long action,
1755 void *hcpu)
1756 {
1757 xfs_icsb_cnts_t *cntp;
1758 xfs_mount_t *mp;
1759 int s;
1760
1761 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
1762 cntp = (xfs_icsb_cnts_t *)
1763 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
1764 switch (action) {
1765 case CPU_UP_PREPARE:
1766 /* Easy Case - initialize the area and locks, and
1767 * then rebalance when online does everything else for us. */
1768 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
1769 break;
1770 case CPU_ONLINE:
1771 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
1772 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
1773 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
1774 break;
1775 case CPU_DEAD:
1776 /* Disable all the counters, then fold the dead cpu's
1777 * count into the total on the global superblock and
1778 * re-enable the counters. */
1779 s = XFS_SB_LOCK(mp);
1780 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
1781 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
1782 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
1783
1784 mp->m_sb.sb_icount += cntp->icsb_icount;
1785 mp->m_sb.sb_ifree += cntp->icsb_ifree;
1786 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
1787
1788 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
1789
1790 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, XFS_ICSB_SB_LOCKED);
1791 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, XFS_ICSB_SB_LOCKED);
1792 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, XFS_ICSB_SB_LOCKED);
1793 XFS_SB_UNLOCK(mp, s);
1794 break;
1795 }
1796
1797 return NOTIFY_OK;
1798 }
1799
1800 int
1801 xfs_icsb_init_counters(
1802 xfs_mount_t *mp)
1803 {
1804 xfs_icsb_cnts_t *cntp;
1805 int i;
1806
1807 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
1808 if (mp->m_sb_cnts == NULL)
1809 return -ENOMEM;
1810
1811 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
1812 mp->m_icsb_notifier.priority = 0;
1813 register_cpu_notifier(&mp->m_icsb_notifier);
1814
1815 for_each_online_cpu(i) {
1816 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1817 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
1818 }
1819 /*
1820 * start with all counters disabled so that the
1821 * initial balance kicks us off correctly
1822 */
1823 mp->m_icsb_counters = -1;
1824 return 0;
1825 }
1826
1827 STATIC void
1828 xfs_icsb_destroy_counters(
1829 xfs_mount_t *mp)
1830 {
1831 if (mp->m_sb_cnts) {
1832 unregister_cpu_notifier(&mp->m_icsb_notifier);
1833 free_percpu(mp->m_sb_cnts);
1834 }
1835 }
1836
1837 STATIC inline void
1838 xfs_icsb_lock_cntr(
1839 xfs_icsb_cnts_t *icsbp)
1840 {
1841 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
1842 ndelay(1000);
1843 }
1844 }
1845
1846 STATIC inline void
1847 xfs_icsb_unlock_cntr(
1848 xfs_icsb_cnts_t *icsbp)
1849 {
1850 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
1851 }
1852
1853
1854 STATIC inline void
1855 xfs_icsb_lock_all_counters(
1856 xfs_mount_t *mp)
1857 {
1858 xfs_icsb_cnts_t *cntp;
1859 int i;
1860
1861 for_each_online_cpu(i) {
1862 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1863 xfs_icsb_lock_cntr(cntp);
1864 }
1865 }
1866
1867 STATIC inline void
1868 xfs_icsb_unlock_all_counters(
1869 xfs_mount_t *mp)
1870 {
1871 xfs_icsb_cnts_t *cntp;
1872 int i;
1873
1874 for_each_online_cpu(i) {
1875 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1876 xfs_icsb_unlock_cntr(cntp);
1877 }
1878 }
1879
1880 STATIC void
1881 xfs_icsb_count(
1882 xfs_mount_t *mp,
1883 xfs_icsb_cnts_t *cnt,
1884 int flags)
1885 {
1886 xfs_icsb_cnts_t *cntp;
1887 int i;
1888
1889 memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
1890
1891 if (!(flags & XFS_ICSB_LAZY_COUNT))
1892 xfs_icsb_lock_all_counters(mp);
1893
1894 for_each_online_cpu(i) {
1895 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1896 cnt->icsb_icount += cntp->icsb_icount;
1897 cnt->icsb_ifree += cntp->icsb_ifree;
1898 cnt->icsb_fdblocks += cntp->icsb_fdblocks;
1899 }
1900
1901 if (!(flags & XFS_ICSB_LAZY_COUNT))
1902 xfs_icsb_unlock_all_counters(mp);
1903 }
1904
1905 STATIC int
1906 xfs_icsb_counter_disabled(
1907 xfs_mount_t *mp,
1908 xfs_sb_field_t field)
1909 {
1910 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1911 return test_bit(field, &mp->m_icsb_counters);
1912 }
1913
1914 STATIC int
1915 xfs_icsb_disable_counter(
1916 xfs_mount_t *mp,
1917 xfs_sb_field_t field)
1918 {
1919 xfs_icsb_cnts_t cnt;
1920
1921 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1922
1923 xfs_icsb_lock_all_counters(mp);
1924 if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
1925 /* drain back to superblock */
1926
1927 xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT);
1928 switch(field) {
1929 case XFS_SBS_ICOUNT:
1930 mp->m_sb.sb_icount = cnt.icsb_icount;
1931 break;
1932 case XFS_SBS_IFREE:
1933 mp->m_sb.sb_ifree = cnt.icsb_ifree;
1934 break;
1935 case XFS_SBS_FDBLOCKS:
1936 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
1937 break;
1938 default:
1939 BUG();
1940 }
1941 }
1942
1943 xfs_icsb_unlock_all_counters(mp);
1944
1945 return 0;
1946 }
1947
1948 STATIC void
1949 xfs_icsb_enable_counter(
1950 xfs_mount_t *mp,
1951 xfs_sb_field_t field,
1952 uint64_t count,
1953 uint64_t resid)
1954 {
1955 xfs_icsb_cnts_t *cntp;
1956 int i;
1957
1958 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1959
1960 xfs_icsb_lock_all_counters(mp);
1961 for_each_online_cpu(i) {
1962 cntp = per_cpu_ptr(mp->m_sb_cnts, i);
1963 switch (field) {
1964 case XFS_SBS_ICOUNT:
1965 cntp->icsb_icount = count + resid;
1966 break;
1967 case XFS_SBS_IFREE:
1968 cntp->icsb_ifree = count + resid;
1969 break;
1970 case XFS_SBS_FDBLOCKS:
1971 cntp->icsb_fdblocks = count + resid;
1972 break;
1973 default:
1974 BUG();
1975 break;
1976 }
1977 resid = 0;
1978 }
1979 clear_bit(field, &mp->m_icsb_counters);
1980 xfs_icsb_unlock_all_counters(mp);
1981 }
1982
1983 STATIC void
1984 xfs_icsb_sync_counters_int(
1985 xfs_mount_t *mp,
1986 int flags)
1987 {
1988 xfs_icsb_cnts_t cnt;
1989 int s;
1990
1991 /* Pass 1: lock all counters */
1992 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
1993 s = XFS_SB_LOCK(mp);
1994
1995 xfs_icsb_count(mp, &cnt, flags);
1996
1997 /* Step 3: update mp->m_sb fields */
1998 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
1999 mp->m_sb.sb_icount = cnt.icsb_icount;
2000 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
2001 mp->m_sb.sb_ifree = cnt.icsb_ifree;
2002 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
2003 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
2004
2005 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
2006 XFS_SB_UNLOCK(mp, s);
2007 }
2008
2009 /*
2010 * Accurate update of per-cpu counters to incore superblock
2011 */
2012 STATIC void
2013 xfs_icsb_sync_counters(
2014 xfs_mount_t *mp)
2015 {
2016 xfs_icsb_sync_counters_int(mp, 0);
2017 }
2018
2019 /*
2020 * lazy addition used for things like df, background sb syncs, etc
2021 */
2022 void
2023 xfs_icsb_sync_counters_lazy(
2024 xfs_mount_t *mp)
2025 {
2026 xfs_icsb_sync_counters_int(mp, XFS_ICSB_LAZY_COUNT);
2027 }
2028
2029 /*
2030 * Balance and enable/disable counters as necessary.
2031 *
2032 * Thresholds for re-enabling counters are somewhat magic.
2033 * inode counts are chosen to be the same number as single
2034 * on disk allocation chunk per CPU, and free blocks is
2035 * something far enough zero that we aren't going thrash
2036 * when we get near ENOSPC.
2037 */
2038 #define XFS_ICSB_INO_CNTR_REENABLE 64
2039 #define XFS_ICSB_FDBLK_CNTR_REENABLE 512
2040 STATIC void
2041 xfs_icsb_balance_counter(
2042 xfs_mount_t *mp,
2043 xfs_sb_field_t field,
2044 int flags)
2045 {
2046 uint64_t count, resid = 0;
2047 int weight = num_online_cpus();
2048 int s;
2049
2050 if (!(flags & XFS_ICSB_SB_LOCKED))
2051 s = XFS_SB_LOCK(mp);
2052
2053 /* disable counter and sync counter */
2054 xfs_icsb_disable_counter(mp, field);
2055
2056 /* update counters - first CPU gets residual*/
2057 switch (field) {
2058 case XFS_SBS_ICOUNT:
2059 count = mp->m_sb.sb_icount;
2060 resid = do_div(count, weight);
2061 if (count < XFS_ICSB_INO_CNTR_REENABLE)
2062 goto out;
2063 break;
2064 case XFS_SBS_IFREE:
2065 count = mp->m_sb.sb_ifree;
2066 resid = do_div(count, weight);
2067 if (count < XFS_ICSB_INO_CNTR_REENABLE)
2068 goto out;
2069 break;
2070 case XFS_SBS_FDBLOCKS:
2071 count = mp->m_sb.sb_fdblocks;
2072 resid = do_div(count, weight);
2073 if (count < XFS_ICSB_FDBLK_CNTR_REENABLE)
2074 goto out;
2075 break;
2076 default:
2077 BUG();
2078 break;
2079 }
2080
2081 xfs_icsb_enable_counter(mp, field, count, resid);
2082 out:
2083 if (!(flags & XFS_ICSB_SB_LOCKED))
2084 XFS_SB_UNLOCK(mp, s);
2085 }
2086
2087 STATIC int
2088 xfs_icsb_modify_counters_int(
2089 xfs_mount_t *mp,
2090 xfs_sb_field_t field,
2091 int delta,
2092 int rsvd,
2093 int flags)
2094 {
2095 xfs_icsb_cnts_t *icsbp;
2096 long long lcounter; /* long counter for 64 bit fields */
2097 int cpu, s, locked = 0;
2098 int ret = 0, balance_done = 0;
2099
2100 again:
2101 cpu = get_cpu();
2102 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu),
2103 xfs_icsb_lock_cntr(icsbp);
2104 if (unlikely(xfs_icsb_counter_disabled(mp, field)))
2105 goto slow_path;
2106
2107 switch (field) {
2108 case XFS_SBS_ICOUNT:
2109 lcounter = icsbp->icsb_icount;
2110 lcounter += delta;
2111 if (unlikely(lcounter < 0))
2112 goto slow_path;
2113 icsbp->icsb_icount = lcounter;
2114 break;
2115
2116 case XFS_SBS_IFREE:
2117 lcounter = icsbp->icsb_ifree;
2118 lcounter += delta;
2119 if (unlikely(lcounter < 0))
2120 goto slow_path;
2121 icsbp->icsb_ifree = lcounter;
2122 break;
2123
2124 case XFS_SBS_FDBLOCKS:
2125 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
2126
2127 lcounter = icsbp->icsb_fdblocks;
2128 lcounter += delta;
2129 if (unlikely(lcounter < 0))
2130 goto slow_path;
2131 icsbp->icsb_fdblocks = lcounter;
2132 break;
2133 default:
2134 BUG();
2135 break;
2136 }
2137 xfs_icsb_unlock_cntr(icsbp);
2138 put_cpu();
2139 if (locked)
2140 XFS_SB_UNLOCK(mp, s);
2141 return 0;
2142
2143 /*
2144 * The slow path needs to be run with the SBLOCK
2145 * held so that we prevent other threads from
2146 * attempting to run this path at the same time.
2147 * this provides exclusion for the balancing code,
2148 * and exclusive fallback if the balance does not
2149 * provide enough resources to continue in an unlocked
2150 * manner.
2151 */
2152 slow_path:
2153 xfs_icsb_unlock_cntr(icsbp);
2154 put_cpu();
2155
2156 /* need to hold superblock incase we need
2157 * to disable a counter */
2158 if (!(flags & XFS_ICSB_SB_LOCKED)) {
2159 s = XFS_SB_LOCK(mp);
2160 locked = 1;
2161 flags |= XFS_ICSB_SB_LOCKED;
2162 }
2163 if (!balance_done) {
2164 xfs_icsb_balance_counter(mp, field, flags);
2165 balance_done = 1;
2166 goto again;
2167 } else {
2168 /*
2169 * we might not have enough on this local
2170 * cpu to allocate for a bulk request.
2171 * We need to drain this field from all CPUs
2172 * and disable the counter fastpath
2173 */
2174 xfs_icsb_disable_counter(mp, field);
2175 }
2176
2177 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
2178
2179 if (locked)
2180 XFS_SB_UNLOCK(mp, s);
2181 return ret;
2182 }
2183
2184 STATIC int
2185 xfs_icsb_modify_counters(
2186 xfs_mount_t *mp,
2187 xfs_sb_field_t field,
2188 int delta,
2189 int rsvd)
2190 {
2191 return xfs_icsb_modify_counters_int(mp, field, delta, rsvd, 0);
2192 }
2193
2194 /*
2195 * Called when superblock is already locked
2196 */
2197 STATIC int
2198 xfs_icsb_modify_counters_locked(
2199 xfs_mount_t *mp,
2200 xfs_sb_field_t field,
2201 int delta,
2202 int rsvd)
2203 {
2204 return xfs_icsb_modify_counters_int(mp, field, delta,
2205 rsvd, XFS_ICSB_SB_LOCKED);
2206 }
2207 #endif
2208