blob: f618f6d6381c7293e318ece36b34ca89538c2def [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32
33#include "xfs.h"
34#include "xfs_macros.h"
35#include "xfs_types.h"
36#include "xfs_inum.h"
37#include "xfs_log.h"
38#include "xfs_trans.h"
39#include "xfs_sb.h"
40#include "xfs_ag.h"
41#include "xfs_dir.h"
42#include "xfs_dir2.h"
43#include "xfs_dmapi.h"
44#include "xfs_mount.h"
45#include "xfs_alloc_btree.h"
46#include "xfs_bmap_btree.h"
47#include "xfs_ialloc_btree.h"
48#include "xfs_btree.h"
49#include "xfs_ialloc.h"
50#include "xfs_attr_sf.h"
51#include "xfs_dir_sf.h"
52#include "xfs_dir2_sf.h"
53#include "xfs_dinode.h"
54#include "xfs_inode.h"
55#include "xfs_alloc.h"
56#include "xfs_rtalloc.h"
57#include "xfs_bmap.h"
58#include "xfs_error.h"
59#include "xfs_bit.h"
60#include "xfs_rw.h"
61#include "xfs_quota.h"
62#include "xfs_fsops.h"
63
64STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
65STATIC int xfs_uuid_mount(xfs_mount_t *);
66STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100067STATIC void xfs_unmountfs_wait(xfs_mount_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69static struct {
70 short offset;
71 short type; /* 0 = integer
72 * 1 = binary / string (no translation)
73 */
74} xfs_sb_info[] = {
75 { offsetof(xfs_sb_t, sb_magicnum), 0 },
76 { offsetof(xfs_sb_t, sb_blocksize), 0 },
77 { offsetof(xfs_sb_t, sb_dblocks), 0 },
78 { offsetof(xfs_sb_t, sb_rblocks), 0 },
79 { offsetof(xfs_sb_t, sb_rextents), 0 },
80 { offsetof(xfs_sb_t, sb_uuid), 1 },
81 { offsetof(xfs_sb_t, sb_logstart), 0 },
82 { offsetof(xfs_sb_t, sb_rootino), 0 },
83 { offsetof(xfs_sb_t, sb_rbmino), 0 },
84 { offsetof(xfs_sb_t, sb_rsumino), 0 },
85 { offsetof(xfs_sb_t, sb_rextsize), 0 },
86 { offsetof(xfs_sb_t, sb_agblocks), 0 },
87 { offsetof(xfs_sb_t, sb_agcount), 0 },
88 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
89 { offsetof(xfs_sb_t, sb_logblocks), 0 },
90 { offsetof(xfs_sb_t, sb_versionnum), 0 },
91 { offsetof(xfs_sb_t, sb_sectsize), 0 },
92 { offsetof(xfs_sb_t, sb_inodesize), 0 },
93 { offsetof(xfs_sb_t, sb_inopblock), 0 },
94 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
95 { offsetof(xfs_sb_t, sb_blocklog), 0 },
96 { offsetof(xfs_sb_t, sb_sectlog), 0 },
97 { offsetof(xfs_sb_t, sb_inodelog), 0 },
98 { offsetof(xfs_sb_t, sb_inopblog), 0 },
99 { offsetof(xfs_sb_t, sb_agblklog), 0 },
100 { offsetof(xfs_sb_t, sb_rextslog), 0 },
101 { offsetof(xfs_sb_t, sb_inprogress), 0 },
102 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
103 { offsetof(xfs_sb_t, sb_icount), 0 },
104 { offsetof(xfs_sb_t, sb_ifree), 0 },
105 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
106 { offsetof(xfs_sb_t, sb_frextents), 0 },
107 { offsetof(xfs_sb_t, sb_uquotino), 0 },
108 { offsetof(xfs_sb_t, sb_gquotino), 0 },
109 { offsetof(xfs_sb_t, sb_qflags), 0 },
110 { offsetof(xfs_sb_t, sb_flags), 0 },
111 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
112 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
113 { offsetof(xfs_sb_t, sb_unit), 0 },
114 { offsetof(xfs_sb_t, sb_width), 0 },
115 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
116 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
117 { offsetof(xfs_sb_t, sb_logsectsize),0 },
118 { offsetof(xfs_sb_t, sb_logsunit), 0 },
119 { offsetof(xfs_sb_t, sb_features2), 0 },
120 { sizeof(xfs_sb_t), 0 }
121};
122
123/*
124 * Return a pointer to an initialized xfs_mount structure.
125 */
126xfs_mount_t *
127xfs_mount_init(void)
128{
129 xfs_mount_t *mp;
130
131 mp = kmem_zalloc(sizeof(*mp), KM_SLEEP);
132
133 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
134 spinlock_init(&mp->m_sb_lock, "xfs_sb");
135 mutex_init(&mp->m_ilock, MUTEX_DEFAULT, "xfs_ilock");
136 initnsema(&mp->m_growlock, 1, "xfs_grow");
137 /*
138 * Initialize the AIL.
139 */
140 xfs_trans_ail_init(mp);
141
142 atomic_set(&mp->m_active_trans, 0);
143
144 return mp;
145}
146
147/*
148 * Free up the resources associated with a mount structure. Assume that
149 * the structure was initially zeroed, so we can tell which fields got
150 * initialized.
151 */
152void
153xfs_mount_free(
154 xfs_mount_t *mp,
155 int remove_bhv)
156{
157 if (mp->m_ihash)
158 xfs_ihash_free(mp);
159 if (mp->m_chash)
160 xfs_chash_free(mp);
161
162 if (mp->m_perag) {
163 int agno;
164
165 for (agno = 0; agno < mp->m_maxagi; agno++)
166 if (mp->m_perag[agno].pagb_list)
167 kmem_free(mp->m_perag[agno].pagb_list,
168 sizeof(xfs_perag_busy_t) *
169 XFS_PAGB_NUM_SLOTS);
170 kmem_free(mp->m_perag,
171 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
172 }
173
174 AIL_LOCK_DESTROY(&mp->m_ail_lock);
175 spinlock_destroy(&mp->m_sb_lock);
176 mutex_destroy(&mp->m_ilock);
177 freesema(&mp->m_growlock);
178 if (mp->m_quotainfo)
179 XFS_QM_DONE(mp);
180
181 if (mp->m_fsname != NULL)
182 kmem_free(mp->m_fsname, mp->m_fsname_len);
183
184 if (remove_bhv) {
185 struct vfs *vfsp = XFS_MTOVFS(mp);
186
187 bhv_remove_all_vfsops(vfsp, 0);
188 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
189 }
190
191 kmem_free(mp, sizeof(xfs_mount_t));
192}
193
194
195/*
196 * Check the validity of the SB found.
197 */
198STATIC int
199xfs_mount_validate_sb(
200 xfs_mount_t *mp,
201 xfs_sb_t *sbp)
202{
203 /*
204 * If the log device and data device have the
205 * same device number, the log is internal.
206 * Consequently, the sb_logstart should be non-zero. If
207 * we have a zero sb_logstart in this case, we may be trying to mount
208 * a volume filesystem in a non-volume manner.
209 */
210 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
211 cmn_err(CE_WARN, "XFS: bad magic number");
212 return XFS_ERROR(EWRONGFS);
213 }
214
215 if (!XFS_SB_GOOD_VERSION(sbp)) {
216 cmn_err(CE_WARN, "XFS: bad version");
217 return XFS_ERROR(EWRONGFS);
218 }
219
220 if (unlikely(
221 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
222 cmn_err(CE_WARN,
223 "XFS: filesystem is marked as having an external log; "
224 "specify logdev on the\nmount command line.");
225 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(1)",
226 XFS_ERRLEVEL_HIGH, mp, sbp);
227 return XFS_ERROR(EFSCORRUPTED);
228 }
229
230 if (unlikely(
231 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
232 cmn_err(CE_WARN,
233 "XFS: filesystem is marked as having an internal log; "
234 "don't specify logdev on\nthe mount command line.");
235 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(2)",
236 XFS_ERRLEVEL_HIGH, mp, sbp);
237 return XFS_ERROR(EFSCORRUPTED);
238 }
239
240 /*
241 * More sanity checking. These were stolen directly from
242 * xfs_repair.
243 */
244 if (unlikely(
245 sbp->sb_agcount <= 0 ||
246 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
247 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
248 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
249 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
250 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
251 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
252 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
253 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
254 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
255 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
256 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
257 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
258 sbp->sb_imax_pct > 100)) {
259 cmn_err(CE_WARN, "XFS: SB sanity check 1 failed");
260 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(3)",
261 XFS_ERRLEVEL_LOW, mp, sbp);
262 return XFS_ERROR(EFSCORRUPTED);
263 }
264
265 /*
266 * Sanity check AG count, size fields against data size field
267 */
268 if (unlikely(
269 sbp->sb_dblocks == 0 ||
270 sbp->sb_dblocks >
271 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
272 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
273 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
274 cmn_err(CE_WARN, "XFS: SB sanity check 2 failed");
275 XFS_ERROR_REPORT("xfs_mount_validate_sb(4)",
276 XFS_ERRLEVEL_LOW, mp);
277 return XFS_ERROR(EFSCORRUPTED);
278 }
279
280 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
281 ASSERT(sbp->sb_blocklog >= BBSHIFT);
282
283#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
284 if (unlikely(
285 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
286 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
287#else /* Limited by UINT_MAX of sectors */
288 if (unlikely(
289 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
290 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
291#endif
292 cmn_err(CE_WARN,
293 "XFS: File system is too large to be mounted on this system.");
294 return XFS_ERROR(E2BIG);
295 }
296
297 if (unlikely(sbp->sb_inprogress)) {
298 cmn_err(CE_WARN, "XFS: file system busy");
299 XFS_ERROR_REPORT("xfs_mount_validate_sb(5)",
300 XFS_ERRLEVEL_LOW, mp);
301 return XFS_ERROR(EFSCORRUPTED);
302 }
303
304 /*
Nathan Scottde206142005-05-05 13:24:13 -0700305 * Version 1 directory format has never worked on Linux.
306 */
307 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
308 cmn_err(CE_WARN,
309 "XFS: Attempted to mount file system using version 1 directory format");
310 return XFS_ERROR(ENOSYS);
311 }
312
313 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 * Until this is fixed only page-sized or smaller data blocks work.
315 */
316 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
317 cmn_err(CE_WARN,
318 "XFS: Attempted to mount file system with blocksize %d bytes",
319 sbp->sb_blocksize);
320 cmn_err(CE_WARN,
321 "XFS: Only page-sized (%d) or less blocksizes currently work.",
322 PAGE_SIZE);
323 return XFS_ERROR(ENOSYS);
324 }
325
326 return 0;
327}
328
329xfs_agnumber_t
330xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
331{
332 xfs_agnumber_t index, max_metadata;
333 xfs_perag_t *pag;
334 xfs_agino_t agino;
335 xfs_ino_t ino;
336 xfs_sb_t *sbp = &mp->m_sb;
337 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
338
339 /* Check to see if the filesystem can overflow 32 bit inodes */
340 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
341 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
342
343 /* Clear the mount flag if no inode can overflow 32 bits
344 * on this filesystem, or if specifically requested..
345 */
346 if ((mp->m_flags & XFS_MOUNT_32BITINOOPT) && ino > max_inum) {
347 mp->m_flags |= XFS_MOUNT_32BITINODES;
348 } else {
349 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
350 }
351
352 /* If we can overflow then setup the ag headers accordingly */
353 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
354 /* Calculate how much should be reserved for inodes to
355 * meet the max inode percentage.
356 */
357 if (mp->m_maxicount) {
358 __uint64_t icount;
359
360 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
361 do_div(icount, 100);
362 icount += sbp->sb_agblocks - 1;
363 do_div(icount, mp->m_ialloc_blks);
364 max_metadata = icount;
365 } else {
366 max_metadata = agcount;
367 }
368 for (index = 0; index < agcount; index++) {
369 ino = XFS_AGINO_TO_INO(mp, index, agino);
370 if (ino > max_inum) {
371 index++;
372 break;
373 }
374
375 /* This ag is prefered for inodes */
376 pag = &mp->m_perag[index];
377 pag->pagi_inodeok = 1;
378 if (index < max_metadata)
379 pag->pagf_metadata = 1;
380 }
381 } else {
382 /* Setup default behavior for smaller filesystems */
383 for (index = 0; index < agcount; index++) {
384 pag = &mp->m_perag[index];
385 pag->pagi_inodeok = 1;
386 }
387 }
388 return index;
389}
390
391/*
392 * xfs_xlatesb
393 *
394 * data - on disk version of sb
395 * sb - a superblock
396 * dir - conversion direction: <0 - convert sb to buf
397 * >0 - convert buf to sb
398 * fields - which fields to copy (bitmask)
399 */
400void
401xfs_xlatesb(
402 void *data,
403 xfs_sb_t *sb,
404 int dir,
405 __int64_t fields)
406{
407 xfs_caddr_t buf_ptr;
408 xfs_caddr_t mem_ptr;
409 xfs_sb_field_t f;
410 int first;
411 int size;
412
413 ASSERT(dir);
414 ASSERT(fields);
415
416 if (!fields)
417 return;
418
419 buf_ptr = (xfs_caddr_t)data;
420 mem_ptr = (xfs_caddr_t)sb;
421
422 while (fields) {
423 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
424 first = xfs_sb_info[f].offset;
425 size = xfs_sb_info[f + 1].offset - first;
426
427 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
428
429 if (size == 1 || xfs_sb_info[f].type == 1) {
430 if (dir > 0) {
431 memcpy(mem_ptr + first, buf_ptr + first, size);
432 } else {
433 memcpy(buf_ptr + first, mem_ptr + first, size);
434 }
435 } else {
436 switch (size) {
437 case 2:
438 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
439 *(__uint16_t*)(mem_ptr+first),
440 dir, ARCH_CONVERT);
441 break;
442 case 4:
443 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
444 *(__uint32_t*)(mem_ptr+first),
445 dir, ARCH_CONVERT);
446 break;
447 case 8:
448 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
449 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
450 break;
451 default:
452 ASSERT(0);
453 }
454 }
455
456 fields &= ~(1LL << f);
457 }
458}
459
460/*
461 * xfs_readsb
462 *
463 * Does the initial read of the superblock.
464 */
465int
466xfs_readsb(xfs_mount_t *mp)
467{
468 unsigned int sector_size;
469 unsigned int extra_flags;
470 xfs_buf_t *bp;
471 xfs_sb_t *sbp;
472 int error;
473
474 ASSERT(mp->m_sb_bp == NULL);
475 ASSERT(mp->m_ddev_targp != NULL);
476
477 /*
478 * Allocate a (locked) buffer to hold the superblock.
479 * This will be kept around at all times to optimize
480 * access to the superblock.
481 */
482 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
483 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
484
485 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
486 BTOBB(sector_size), extra_flags);
487 if (!bp || XFS_BUF_ISERROR(bp)) {
488 cmn_err(CE_WARN, "XFS: SB read failed");
489 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
490 goto fail;
491 }
492 ASSERT(XFS_BUF_ISBUSY(bp));
493 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
494
495 /*
496 * Initialize the mount structure from the superblock.
497 * But first do some basic consistency checking.
498 */
499 sbp = XFS_BUF_TO_SBP(bp);
500 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
501
502 error = xfs_mount_validate_sb(mp, &(mp->m_sb));
503 if (error) {
504 cmn_err(CE_WARN, "XFS: SB validate failed");
505 goto fail;
506 }
507
508 /*
509 * We must be able to do sector-sized and sector-aligned IO.
510 */
511 if (sector_size > mp->m_sb.sb_sectsize) {
512 cmn_err(CE_WARN,
513 "XFS: device supports only %u byte sectors (not %u)",
514 sector_size, mp->m_sb.sb_sectsize);
515 error = ENOSYS;
516 goto fail;
517 }
518
519 /*
520 * If device sector size is smaller than the superblock size,
521 * re-read the superblock so the buffer is correctly sized.
522 */
523 if (sector_size < mp->m_sb.sb_sectsize) {
524 XFS_BUF_UNMANAGE(bp);
525 xfs_buf_relse(bp);
526 sector_size = mp->m_sb.sb_sectsize;
527 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
528 BTOBB(sector_size), extra_flags);
529 if (!bp || XFS_BUF_ISERROR(bp)) {
530 cmn_err(CE_WARN, "XFS: SB re-read failed");
531 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
532 goto fail;
533 }
534 ASSERT(XFS_BUF_ISBUSY(bp));
535 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
536 }
537
538 mp->m_sb_bp = bp;
539 xfs_buf_relse(bp);
540 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
541 return 0;
542
543 fail:
544 if (bp) {
545 XFS_BUF_UNMANAGE(bp);
546 xfs_buf_relse(bp);
547 }
548 return error;
549}
550
551
552/*
553 * xfs_mount_common
554 *
555 * Mount initialization code establishing various mount
556 * fields from the superblock associated with the given
557 * mount structure
558 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000559STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
561{
562 int i;
563
564 mp->m_agfrotor = mp->m_agirotor = 0;
565 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
566 mp->m_maxagi = mp->m_sb.sb_agcount;
567 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
568 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
569 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
570 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
571 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
572 mp->m_litino = sbp->sb_inodesize -
573 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
574 mp->m_blockmask = sbp->sb_blocksize - 1;
575 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
576 mp->m_blockwmask = mp->m_blockwsize - 1;
577 INIT_LIST_HEAD(&mp->m_del_inodes);
578
579 /*
580 * Setup for attributes, in case they get created.
581 * This value is for inodes getting attributes for the first time,
582 * the per-inode value is for old attribute values.
583 */
584 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
585 switch (sbp->sb_inodesize) {
586 case 256:
587 mp->m_attroffset = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(2);
588 break;
589 case 512:
590 case 1024:
591 case 2048:
592 mp->m_attroffset = XFS_BMDR_SPACE_CALC(12);
593 break;
594 default:
595 ASSERT(0);
596 }
597 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
598
599 for (i = 0; i < 2; i++) {
600 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
601 xfs_alloc, i == 0);
602 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
603 xfs_alloc, i == 0);
604 }
605 for (i = 0; i < 2; i++) {
606 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
607 xfs_bmbt, i == 0);
608 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
609 xfs_bmbt, i == 0);
610 }
611 for (i = 0; i < 2; i++) {
612 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
613 xfs_inobt, i == 0);
614 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
615 xfs_inobt, i == 0);
616 }
617
618 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
619 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
620 sbp->sb_inopblock);
621 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
622}
623/*
624 * xfs_mountfs
625 *
626 * This function does the following on an initial mount of a file system:
627 * - reads the superblock from disk and init the mount struct
628 * - if we're a 32-bit kernel, do a size check on the superblock
629 * so we don't mount terabyte filesystems
630 * - init mount struct realtime fields
631 * - allocate inode hash table for fs
632 * - init directory manager
633 * - perform recovery and init the log manager
634 */
635int
636xfs_mountfs(
637 vfs_t *vfsp,
638 xfs_mount_t *mp,
639 int mfsi_flags)
640{
641 xfs_buf_t *bp;
642 xfs_sb_t *sbp = &(mp->m_sb);
643 xfs_inode_t *rip;
644 vnode_t *rvp = NULL;
645 int readio_log, writeio_log;
646 xfs_daddr_t d;
647 __uint64_t ret64;
648 __int64_t update_flags;
649 uint quotamount, quotaflags;
650 int agno;
651 int uuid_mounted = 0;
652 int error = 0;
653
654 if (mp->m_sb_bp == NULL) {
655 if ((error = xfs_readsb(mp))) {
656 return (error);
657 }
658 }
659 xfs_mount_common(mp, sbp);
660
661 /*
662 * Check if sb_agblocks is aligned at stripe boundary
663 * If sb_agblocks is NOT aligned turn off m_dalign since
664 * allocator alignment is within an ag, therefore ag has
665 * to be aligned at stripe boundary.
666 */
667 update_flags = 0LL;
668 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
669 /*
670 * If stripe unit and stripe width are not multiples
671 * of the fs blocksize turn off alignment.
672 */
673 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
674 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
675 if (mp->m_flags & XFS_MOUNT_RETERR) {
676 cmn_err(CE_WARN,
677 "XFS: alignment check 1 failed");
678 error = XFS_ERROR(EINVAL);
679 goto error1;
680 }
681 mp->m_dalign = mp->m_swidth = 0;
682 } else {
683 /*
684 * Convert the stripe unit and width to FSBs.
685 */
686 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
687 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
688 if (mp->m_flags & XFS_MOUNT_RETERR) {
689 error = XFS_ERROR(EINVAL);
690 goto error1;
691 }
692 xfs_fs_cmn_err(CE_WARN, mp,
693"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
694 mp->m_dalign, mp->m_swidth,
695 sbp->sb_agblocks);
696
697 mp->m_dalign = 0;
698 mp->m_swidth = 0;
699 } else if (mp->m_dalign) {
700 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
701 } else {
702 if (mp->m_flags & XFS_MOUNT_RETERR) {
703 xfs_fs_cmn_err(CE_WARN, mp,
704"stripe alignment turned off: sunit(%d) less than bsize(%d)",
705 mp->m_dalign,
706 mp->m_blockmask +1);
707 error = XFS_ERROR(EINVAL);
708 goto error1;
709 }
710 mp->m_swidth = 0;
711 }
712 }
713
714 /*
715 * Update superblock with new values
716 * and log changes
717 */
718 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
719 if (sbp->sb_unit != mp->m_dalign) {
720 sbp->sb_unit = mp->m_dalign;
721 update_flags |= XFS_SB_UNIT;
722 }
723 if (sbp->sb_width != mp->m_swidth) {
724 sbp->sb_width = mp->m_swidth;
725 update_flags |= XFS_SB_WIDTH;
726 }
727 }
728 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
729 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
730 mp->m_dalign = sbp->sb_unit;
731 mp->m_swidth = sbp->sb_width;
732 }
733
734 xfs_alloc_compute_maxlevels(mp);
735 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
736 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
737 xfs_ialloc_compute_maxlevels(mp);
738
739 if (sbp->sb_imax_pct) {
740 __uint64_t icount;
741
742 /* Make sure the maximum inode count is a multiple of the
743 * units we allocate inodes in.
744 */
745
746 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
747 do_div(icount, 100);
748 do_div(icount, mp->m_ialloc_blks);
749 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
750 sbp->sb_inopblog;
751 } else
752 mp->m_maxicount = 0;
753
754 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
755
756 /*
757 * XFS uses the uuid from the superblock as the unique
758 * identifier for fsid. We can not use the uuid from the volume
759 * since a single partition filesystem is identical to a single
760 * partition volume/filesystem.
761 */
762 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
763 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
764 if (xfs_uuid_mount(mp)) {
765 error = XFS_ERROR(EINVAL);
766 goto error1;
767 }
768 uuid_mounted=1;
769 ret64 = uuid_hash64(&sbp->sb_uuid);
770 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
771 }
772
773 /*
774 * Set the default minimum read and write sizes unless
775 * already specified in a mount option.
776 * We use smaller I/O sizes when the file system
777 * is being used for NFS service (wsync mount option).
778 */
779 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
780 if (mp->m_flags & XFS_MOUNT_WSYNC) {
781 readio_log = XFS_WSYNC_READIO_LOG;
782 writeio_log = XFS_WSYNC_WRITEIO_LOG;
783 } else {
784 readio_log = XFS_READIO_LOG_LARGE;
785 writeio_log = XFS_WRITEIO_LOG_LARGE;
786 }
787 } else {
788 readio_log = mp->m_readio_log;
789 writeio_log = mp->m_writeio_log;
790 }
791
792 /*
793 * Set the number of readahead buffers to use based on
794 * physical memory size.
795 */
796 if (xfs_physmem <= 4096) /* <= 16MB */
797 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
798 else if (xfs_physmem <= 8192) /* <= 32MB */
799 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
800 else
801 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
802 if (sbp->sb_blocklog > readio_log) {
803 mp->m_readio_log = sbp->sb_blocklog;
804 } else {
805 mp->m_readio_log = readio_log;
806 }
807 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
808 if (sbp->sb_blocklog > writeio_log) {
809 mp->m_writeio_log = sbp->sb_blocklog;
810 } else {
811 mp->m_writeio_log = writeio_log;
812 }
813 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
814
815 /*
816 * Set the inode cluster size based on the physical memory
817 * size. This may still be overridden by the file system
818 * block size if it is larger than the chosen cluster size.
819 */
820 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
821 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
822 } else {
823 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
824 }
825 /*
826 * Set whether we're using inode alignment.
827 */
828 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
829 mp->m_sb.sb_inoalignmt >=
830 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
831 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
832 else
833 mp->m_inoalign_mask = 0;
834 /*
835 * If we are using stripe alignment, check whether
836 * the stripe unit is a multiple of the inode alignment
837 */
838 if (mp->m_dalign && mp->m_inoalign_mask &&
839 !(mp->m_dalign & mp->m_inoalign_mask))
840 mp->m_sinoalign = mp->m_dalign;
841 else
842 mp->m_sinoalign = 0;
843 /*
844 * Check that the data (and log if separate) are an ok size.
845 */
846 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
847 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
848 cmn_err(CE_WARN, "XFS: size check 1 failed");
849 error = XFS_ERROR(E2BIG);
850 goto error1;
851 }
852 error = xfs_read_buf(mp, mp->m_ddev_targp,
853 d - XFS_FSS_TO_BB(mp, 1),
854 XFS_FSS_TO_BB(mp, 1), 0, &bp);
855 if (!error) {
856 xfs_buf_relse(bp);
857 } else {
858 cmn_err(CE_WARN, "XFS: size check 2 failed");
859 if (error == ENOSPC) {
860 error = XFS_ERROR(E2BIG);
861 }
862 goto error1;
863 }
864
865 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
866 mp->m_logdev_targp != mp->m_ddev_targp) {
867 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
868 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
869 cmn_err(CE_WARN, "XFS: size check 3 failed");
870 error = XFS_ERROR(E2BIG);
871 goto error1;
872 }
873 error = xfs_read_buf(mp, mp->m_logdev_targp,
874 d - XFS_FSB_TO_BB(mp, 1),
875 XFS_FSB_TO_BB(mp, 1), 0, &bp);
876 if (!error) {
877 xfs_buf_relse(bp);
878 } else {
879 cmn_err(CE_WARN, "XFS: size check 3 failed");
880 if (error == ENOSPC) {
881 error = XFS_ERROR(E2BIG);
882 }
883 goto error1;
884 }
885 }
886
887 /*
888 * Initialize realtime fields in the mount structure
889 */
890 if ((error = xfs_rtmount_init(mp))) {
891 cmn_err(CE_WARN, "XFS: RT mount failed");
892 goto error1;
893 }
894
895 /*
896 * For client case we are done now
897 */
898 if (mfsi_flags & XFS_MFSI_CLIENT) {
899 return(0);
900 }
901
902 /*
903 * Copies the low order bits of the timestamp and the randomly
904 * set "sequence" number out of a UUID.
905 */
906 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
907
908 /*
909 * The vfs structure needs to have a file system independent
910 * way of checking for the invariant file system ID. Since it
911 * can't look at mount structures it has a pointer to the data
912 * in the mount structure.
913 *
914 * File systems that don't support user level file handles (i.e.
915 * all of them except for XFS) will leave vfs_altfsid as NULL.
916 */
917 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
918 mp->m_dmevmask = 0; /* not persistent; set after each mount */
919
920 /*
921 * Select the right directory manager.
922 */
923 mp->m_dirops =
924 XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
925 xfsv2_dirops :
926 xfsv1_dirops;
927
928 /*
929 * Initialize directory manager's entries.
930 */
931 XFS_DIR_MOUNT(mp);
932
933 /*
934 * Initialize the attribute manager's entries.
935 */
936 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
937
938 /*
939 * Initialize the precomputed transaction reservations values.
940 */
941 xfs_trans_init(mp);
942
943 /*
944 * Allocate and initialize the inode hash table for this
945 * file system.
946 */
947 xfs_ihash_init(mp);
948 xfs_chash_init(mp);
949
950 /*
951 * Allocate and initialize the per-ag data.
952 */
953 init_rwsem(&mp->m_peraglock);
954 mp->m_perag =
955 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
956
957 mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
958
959 /*
960 * log's mount-time initialization. Perform 1st part recovery if needed
961 */
962 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
963 error = xfs_log_mount(mp, mp->m_logdev_targp,
964 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
965 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
966 if (error) {
967 cmn_err(CE_WARN, "XFS: log mount failed");
968 goto error2;
969 }
970 } else { /* No log has been defined */
971 cmn_err(CE_WARN, "XFS: no log defined");
972 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
973 error = XFS_ERROR(EFSCORRUPTED);
974 goto error2;
975 }
976
977 /*
978 * Get and sanity-check the root inode.
979 * Save the pointer to it in the mount structure.
980 */
981 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
982 if (error) {
983 cmn_err(CE_WARN, "XFS: failed to read root inode");
984 goto error3;
985 }
986
987 ASSERT(rip != NULL);
988 rvp = XFS_ITOV(rip);
989
990 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
991 cmn_err(CE_WARN, "XFS: corrupted root inode");
992 prdev("Root inode %llu is not a directory",
993 mp->m_ddev_targp, (unsigned long long)rip->i_ino);
994 xfs_iunlock(rip, XFS_ILOCK_EXCL);
995 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
996 mp);
997 error = XFS_ERROR(EFSCORRUPTED);
998 goto error4;
999 }
1000 mp->m_rootip = rip; /* save it */
1001
1002 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1003
1004 /*
1005 * Initialize realtime inode pointers in the mount structure
1006 */
1007 if ((error = xfs_rtmount_inodes(mp))) {
1008 /*
1009 * Free up the root inode.
1010 */
1011 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1012 goto error4;
1013 }
1014
1015 /*
1016 * If fs is not mounted readonly, then update the superblock
1017 * unit and width changes.
1018 */
1019 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1020 xfs_mount_log_sbunit(mp, update_flags);
1021
1022 /*
1023 * Initialise the XFS quota management subsystem for this mount
1024 */
1025 if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
1026 goto error4;
1027
1028 /*
1029 * Finish recovering the file system. This part needed to be
1030 * delayed until after the root and real-time bitmap inodes
1031 * were consistently read in.
1032 */
1033 error = xfs_log_mount_finish(mp, mfsi_flags);
1034 if (error) {
1035 cmn_err(CE_WARN, "XFS: log mount finish failed");
1036 goto error4;
1037 }
1038
1039 /*
1040 * Complete the quota initialisation, post-log-replay component.
1041 */
1042 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1043 goto error4;
1044
1045 return 0;
1046
1047 error4:
1048 /*
1049 * Free up the root inode.
1050 */
1051 VN_RELE(rvp);
1052 error3:
1053 xfs_log_unmount_dealloc(mp);
1054 error2:
1055 xfs_ihash_free(mp);
1056 xfs_chash_free(mp);
1057 for (agno = 0; agno < sbp->sb_agcount; agno++)
1058 if (mp->m_perag[agno].pagb_list)
1059 kmem_free(mp->m_perag[agno].pagb_list,
1060 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1061 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1062 mp->m_perag = NULL;
1063 /* FALLTHROUGH */
1064 error1:
1065 if (uuid_mounted)
1066 xfs_uuid_unmount(mp);
1067 xfs_freesb(mp);
1068 return error;
1069}
1070
1071/*
1072 * xfs_unmountfs
1073 *
1074 * This flushes out the inodes,dquots and the superblock, unmounts the
1075 * log and makes sure that incore structures are freed.
1076 */
1077int
1078xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1079{
1080 struct vfs *vfsp = XFS_MTOVFS(mp);
1081#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1082 int64_t fsid;
1083#endif
1084
1085 xfs_iflush_all(mp, XFS_FLUSH_ALL);
1086
1087 XFS_QM_DQPURGEALL(mp,
1088 XFS_QMOPT_UQUOTA | XFS_QMOPT_GQUOTA | XFS_QMOPT_UMOUNTING);
1089
1090 /*
1091 * Flush out the log synchronously so that we know for sure
1092 * that nothing is pinned. This is important because bflush()
1093 * will skip pinned buffers.
1094 */
1095 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1096
1097 xfs_binval(mp->m_ddev_targp);
1098 if (mp->m_rtdev_targp) {
1099 xfs_binval(mp->m_rtdev_targp);
1100 }
1101
1102 xfs_unmountfs_writesb(mp);
1103
1104 xfs_unmountfs_wait(mp); /* wait for async bufs */
1105
1106 xfs_log_unmount(mp); /* Done! No more fs ops. */
1107
1108 xfs_freesb(mp);
1109
1110 /*
1111 * All inodes from this mount point should be freed.
1112 */
1113 ASSERT(mp->m_inodes == NULL);
1114
1115 /*
1116 * We may have bufs that are in the process of getting written still.
1117 * We must wait for the I/O completion of those. The sync flag here
1118 * does a two pass iteration thru the bufcache.
1119 */
1120 if (XFS_FORCED_SHUTDOWN(mp)) {
1121 xfs_incore_relse(mp->m_ddev_targp, 0, 1); /* synchronous */
1122 }
1123
1124 xfs_unmountfs_close(mp, cr);
1125 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1126 xfs_uuid_unmount(mp);
1127
1128#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1129 /*
1130 * clear all error tags on this filesystem
1131 */
1132 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1133 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1134#endif
1135 XFS_IODONE(vfsp);
1136 xfs_mount_free(mp, 1);
1137 return 0;
1138}
1139
1140void
1141xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1142{
1143 if (mp->m_logdev_targp != mp->m_ddev_targp)
1144 xfs_free_buftarg(mp->m_logdev_targp, 1);
1145 if (mp->m_rtdev_targp)
1146 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1147 xfs_free_buftarg(mp->m_ddev_targp, 0);
1148}
1149
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001150STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151xfs_unmountfs_wait(xfs_mount_t *mp)
1152{
1153 if (mp->m_logdev_targp != mp->m_ddev_targp)
1154 xfs_wait_buftarg(mp->m_logdev_targp);
1155 if (mp->m_rtdev_targp)
1156 xfs_wait_buftarg(mp->m_rtdev_targp);
1157 xfs_wait_buftarg(mp->m_ddev_targp);
1158}
1159
1160int
1161xfs_unmountfs_writesb(xfs_mount_t *mp)
1162{
1163 xfs_buf_t *sbp;
1164 xfs_sb_t *sb;
1165 int error = 0;
1166
1167 /*
1168 * skip superblock write if fs is read-only, or
1169 * if we are doing a forced umount.
1170 */
1171 sbp = xfs_getsb(mp, 0);
1172 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1173 XFS_FORCED_SHUTDOWN(mp))) {
1174 /*
1175 * mark shared-readonly if desired
1176 */
1177 sb = XFS_BUF_TO_SBP(sbp);
1178 if (mp->m_mk_sharedro) {
1179 if (!(sb->sb_flags & XFS_SBF_READONLY))
1180 sb->sb_flags |= XFS_SBF_READONLY;
1181 if (!XFS_SB_VERSION_HASSHARED(sb))
1182 XFS_SB_VERSION_ADDSHARED(sb);
1183 xfs_fs_cmn_err(CE_NOTE, mp,
1184 "Unmounting, marking shared read-only");
1185 }
1186 XFS_BUF_UNDONE(sbp);
1187 XFS_BUF_UNREAD(sbp);
1188 XFS_BUF_UNDELAYWRITE(sbp);
1189 XFS_BUF_WRITE(sbp);
1190 XFS_BUF_UNASYNC(sbp);
1191 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1192 xfsbdstrat(mp, sbp);
1193 /* Nevermind errors we might get here. */
1194 error = xfs_iowait(sbp);
1195 if (error)
1196 xfs_ioerror_alert("xfs_unmountfs_writesb",
1197 mp, sbp, XFS_BUF_ADDR(sbp));
1198 if (error && mp->m_mk_sharedro)
1199 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1200 }
1201 xfs_buf_relse(sbp);
1202 return (error);
1203}
1204
1205/*
1206 * xfs_mod_sb() can be used to copy arbitrary changes to the
1207 * in-core superblock into the superblock buffer to be logged.
1208 * It does not provide the higher level of locking that is
1209 * needed to protect the in-core superblock from concurrent
1210 * access.
1211 */
1212void
1213xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1214{
1215 xfs_buf_t *bp;
1216 int first;
1217 int last;
1218 xfs_mount_t *mp;
1219 xfs_sb_t *sbp;
1220 xfs_sb_field_t f;
1221
1222 ASSERT(fields);
1223 if (!fields)
1224 return;
1225 mp = tp->t_mountp;
1226 bp = xfs_trans_getsb(tp, mp, 0);
1227 sbp = XFS_BUF_TO_SBP(bp);
1228 first = sizeof(xfs_sb_t);
1229 last = 0;
1230
1231 /* translate/copy */
1232
1233 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1234
1235 /* find modified range */
1236
1237 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1238 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1239 first = xfs_sb_info[f].offset;
1240
1241 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1242 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1243 last = xfs_sb_info[f + 1].offset - 1;
1244
1245 xfs_trans_log_buf(tp, bp, first, last);
1246}
1247
1248/*
1249 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1250 * a delta to a specified field in the in-core superblock. Simply
1251 * switch on the field indicated and apply the delta to that field.
1252 * Fields are not allowed to dip below zero, so if the delta would
1253 * do this do not apply it and return EINVAL.
1254 *
1255 * The SB_LOCK must be held when this routine is called.
1256 */
1257STATIC int
1258xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
1259 int delta, int rsvd)
1260{
1261 int scounter; /* short counter for 32 bit fields */
1262 long long lcounter; /* long counter for 64 bit fields */
1263 long long res_used, rem;
1264
1265 /*
1266 * With the in-core superblock spin lock held, switch
1267 * on the indicated field. Apply the delta to the
1268 * proper field. If the fields value would dip below
1269 * 0, then do not apply the delta and return EINVAL.
1270 */
1271 switch (field) {
1272 case XFS_SBS_ICOUNT:
1273 lcounter = (long long)mp->m_sb.sb_icount;
1274 lcounter += delta;
1275 if (lcounter < 0) {
1276 ASSERT(0);
1277 return (XFS_ERROR(EINVAL));
1278 }
1279 mp->m_sb.sb_icount = lcounter;
1280 return (0);
1281 case XFS_SBS_IFREE:
1282 lcounter = (long long)mp->m_sb.sb_ifree;
1283 lcounter += delta;
1284 if (lcounter < 0) {
1285 ASSERT(0);
1286 return (XFS_ERROR(EINVAL));
1287 }
1288 mp->m_sb.sb_ifree = lcounter;
1289 return (0);
1290 case XFS_SBS_FDBLOCKS:
1291
1292 lcounter = (long long)mp->m_sb.sb_fdblocks;
1293 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1294
1295 if (delta > 0) { /* Putting blocks back */
1296 if (res_used > delta) {
1297 mp->m_resblks_avail += delta;
1298 } else {
1299 rem = delta - res_used;
1300 mp->m_resblks_avail = mp->m_resblks;
1301 lcounter += rem;
1302 }
1303 } else { /* Taking blocks away */
1304
1305 lcounter += delta;
1306
1307 /*
1308 * If were out of blocks, use any available reserved blocks if
1309 * were allowed to.
1310 */
1311
1312 if (lcounter < 0) {
1313 if (rsvd) {
1314 lcounter = (long long)mp->m_resblks_avail + delta;
1315 if (lcounter < 0) {
1316 return (XFS_ERROR(ENOSPC));
1317 }
1318 mp->m_resblks_avail = lcounter;
1319 return (0);
1320 } else { /* not reserved */
1321 return (XFS_ERROR(ENOSPC));
1322 }
1323 }
1324 }
1325
1326 mp->m_sb.sb_fdblocks = lcounter;
1327 return (0);
1328 case XFS_SBS_FREXTENTS:
1329 lcounter = (long long)mp->m_sb.sb_frextents;
1330 lcounter += delta;
1331 if (lcounter < 0) {
1332 return (XFS_ERROR(ENOSPC));
1333 }
1334 mp->m_sb.sb_frextents = lcounter;
1335 return (0);
1336 case XFS_SBS_DBLOCKS:
1337 lcounter = (long long)mp->m_sb.sb_dblocks;
1338 lcounter += delta;
1339 if (lcounter < 0) {
1340 ASSERT(0);
1341 return (XFS_ERROR(EINVAL));
1342 }
1343 mp->m_sb.sb_dblocks = lcounter;
1344 return (0);
1345 case XFS_SBS_AGCOUNT:
1346 scounter = mp->m_sb.sb_agcount;
1347 scounter += delta;
1348 if (scounter < 0) {
1349 ASSERT(0);
1350 return (XFS_ERROR(EINVAL));
1351 }
1352 mp->m_sb.sb_agcount = scounter;
1353 return (0);
1354 case XFS_SBS_IMAX_PCT:
1355 scounter = mp->m_sb.sb_imax_pct;
1356 scounter += delta;
1357 if (scounter < 0) {
1358 ASSERT(0);
1359 return (XFS_ERROR(EINVAL));
1360 }
1361 mp->m_sb.sb_imax_pct = scounter;
1362 return (0);
1363 case XFS_SBS_REXTSIZE:
1364 scounter = mp->m_sb.sb_rextsize;
1365 scounter += delta;
1366 if (scounter < 0) {
1367 ASSERT(0);
1368 return (XFS_ERROR(EINVAL));
1369 }
1370 mp->m_sb.sb_rextsize = scounter;
1371 return (0);
1372 case XFS_SBS_RBMBLOCKS:
1373 scounter = mp->m_sb.sb_rbmblocks;
1374 scounter += delta;
1375 if (scounter < 0) {
1376 ASSERT(0);
1377 return (XFS_ERROR(EINVAL));
1378 }
1379 mp->m_sb.sb_rbmblocks = scounter;
1380 return (0);
1381 case XFS_SBS_RBLOCKS:
1382 lcounter = (long long)mp->m_sb.sb_rblocks;
1383 lcounter += delta;
1384 if (lcounter < 0) {
1385 ASSERT(0);
1386 return (XFS_ERROR(EINVAL));
1387 }
1388 mp->m_sb.sb_rblocks = lcounter;
1389 return (0);
1390 case XFS_SBS_REXTENTS:
1391 lcounter = (long long)mp->m_sb.sb_rextents;
1392 lcounter += delta;
1393 if (lcounter < 0) {
1394 ASSERT(0);
1395 return (XFS_ERROR(EINVAL));
1396 }
1397 mp->m_sb.sb_rextents = lcounter;
1398 return (0);
1399 case XFS_SBS_REXTSLOG:
1400 scounter = mp->m_sb.sb_rextslog;
1401 scounter += delta;
1402 if (scounter < 0) {
1403 ASSERT(0);
1404 return (XFS_ERROR(EINVAL));
1405 }
1406 mp->m_sb.sb_rextslog = scounter;
1407 return (0);
1408 default:
1409 ASSERT(0);
1410 return (XFS_ERROR(EINVAL));
1411 }
1412}
1413
1414/*
1415 * xfs_mod_incore_sb() is used to change a field in the in-core
1416 * superblock structure by the specified delta. This modification
1417 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1418 * routine to do the work.
1419 */
1420int
1421xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
1422{
1423 unsigned long s;
1424 int status;
1425
1426 s = XFS_SB_LOCK(mp);
1427 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1428 XFS_SB_UNLOCK(mp, s);
1429 return (status);
1430}
1431
1432/*
1433 * xfs_mod_incore_sb_batch() is used to change more than one field
1434 * in the in-core superblock structure at a time. This modification
1435 * is protected by a lock internal to this module. The fields and
1436 * changes to those fields are specified in the array of xfs_mod_sb
1437 * structures passed in.
1438 *
1439 * Either all of the specified deltas will be applied or none of
1440 * them will. If any modified field dips below 0, then all modifications
1441 * will be backed out and EINVAL will be returned.
1442 */
1443int
1444xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1445{
1446 unsigned long s;
1447 int status=0;
1448 xfs_mod_sb_t *msbp;
1449
1450 /*
1451 * Loop through the array of mod structures and apply each
1452 * individually. If any fail, then back out all those
1453 * which have already been applied. Do all of this within
1454 * the scope of the SB_LOCK so that all of the changes will
1455 * be atomic.
1456 */
1457 s = XFS_SB_LOCK(mp);
1458 msbp = &msb[0];
1459 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1460 /*
1461 * Apply the delta at index n. If it fails, break
1462 * from the loop so we'll fall into the undo loop
1463 * below.
1464 */
1465 status = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
1466 msbp->msb_delta, rsvd);
1467 if (status != 0) {
1468 break;
1469 }
1470 }
1471
1472 /*
1473 * If we didn't complete the loop above, then back out
1474 * any changes made to the superblock. If you add code
1475 * between the loop above and here, make sure that you
1476 * preserve the value of status. Loop back until
1477 * we step below the beginning of the array. Make sure
1478 * we don't touch anything back there.
1479 */
1480 if (status != 0) {
1481 msbp--;
1482 while (msbp >= msb) {
1483 status = xfs_mod_incore_sb_unlocked(mp,
1484 msbp->msb_field, -(msbp->msb_delta), rsvd);
1485 ASSERT(status == 0);
1486 msbp--;
1487 }
1488 }
1489 XFS_SB_UNLOCK(mp, s);
1490 return (status);
1491}
1492
1493/*
1494 * xfs_getsb() is called to obtain the buffer for the superblock.
1495 * The buffer is returned locked and read in from disk.
1496 * The buffer should be released with a call to xfs_brelse().
1497 *
1498 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1499 * the superblock buffer if it can be locked without sleeping.
1500 * If it can't then we'll return NULL.
1501 */
1502xfs_buf_t *
1503xfs_getsb(
1504 xfs_mount_t *mp,
1505 int flags)
1506{
1507 xfs_buf_t *bp;
1508
1509 ASSERT(mp->m_sb_bp != NULL);
1510 bp = mp->m_sb_bp;
1511 if (flags & XFS_BUF_TRYLOCK) {
1512 if (!XFS_BUF_CPSEMA(bp)) {
1513 return NULL;
1514 }
1515 } else {
1516 XFS_BUF_PSEMA(bp, PRIBIO);
1517 }
1518 XFS_BUF_HOLD(bp);
1519 ASSERT(XFS_BUF_ISDONE(bp));
1520 return (bp);
1521}
1522
1523/*
1524 * Used to free the superblock along various error paths.
1525 */
1526void
1527xfs_freesb(
1528 xfs_mount_t *mp)
1529{
1530 xfs_buf_t *bp;
1531
1532 /*
1533 * Use xfs_getsb() so that the buffer will be locked
1534 * when we call xfs_buf_relse().
1535 */
1536 bp = xfs_getsb(mp, 0);
1537 XFS_BUF_UNMANAGE(bp);
1538 xfs_buf_relse(bp);
1539 mp->m_sb_bp = NULL;
1540}
1541
1542/*
1543 * See if the UUID is unique among mounted XFS filesystems.
1544 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1545 */
1546STATIC int
1547xfs_uuid_mount(
1548 xfs_mount_t *mp)
1549{
1550 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1551 cmn_err(CE_WARN,
1552 "XFS: Filesystem %s has nil UUID - can't mount",
1553 mp->m_fsname);
1554 return -1;
1555 }
1556 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1557 cmn_err(CE_WARN,
1558 "XFS: Filesystem %s has duplicate UUID - can't mount",
1559 mp->m_fsname);
1560 return -1;
1561 }
1562 return 0;
1563}
1564
1565/*
1566 * Remove filesystem from the UUID table.
1567 */
1568STATIC void
1569xfs_uuid_unmount(
1570 xfs_mount_t *mp)
1571{
1572 uuid_table_remove(&mp->m_sb.sb_uuid);
1573}
1574
1575/*
1576 * Used to log changes to the superblock unit and width fields which could
1577 * be altered by the mount options. Only the first superblock is updated.
1578 */
1579STATIC void
1580xfs_mount_log_sbunit(
1581 xfs_mount_t *mp,
1582 __int64_t fields)
1583{
1584 xfs_trans_t *tp;
1585
1586 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1587
1588 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1589 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1590 XFS_DEFAULT_LOG_COUNT)) {
1591 xfs_trans_cancel(tp, 0);
1592 return;
1593 }
1594 xfs_mod_sb(tp, fields);
1595 xfs_trans_commit(tp, 0, NULL);
1596}