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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110034#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "xfs_dinode.h"
36#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110037#include "xfs_btree.h"
38#include "xfs_ialloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "xfs_alloc.h"
40#include "xfs_rtalloc.h"
41#include "xfs_bmap.h"
42#include "xfs_error.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "xfs_rw.h"
44#include "xfs_quota.h"
45#include "xfs_fsops.h"
46
47STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
48STATIC int xfs_uuid_mount(xfs_mount_t *);
49STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100050STATIC void xfs_unmountfs_wait(xfs_mount_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
David Chinner8d280b92006-03-14 13:13:09 +110052
53#ifdef HAVE_PERCPU_SB
54STATIC void xfs_icsb_destroy_counters(xfs_mount_t *);
David Chinner20f4ebf2007-02-10 18:36:10 +110055STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t,
56 int, int);
David Chinner8d280b92006-03-14 13:13:09 +110057STATIC void xfs_icsb_sync_counters(xfs_mount_t *);
58STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
David Chinner20f4ebf2007-02-10 18:36:10 +110059 int64_t, int);
David Chinnere8234a62006-03-14 13:23:52 +110060STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
David Chinner8d280b92006-03-14 13:13:09 +110061
62#else
63
64#define xfs_icsb_destroy_counters(mp) do { } while (0)
David Chinner20b64282007-02-10 18:35:09 +110065#define xfs_icsb_balance_counter(mp, a, b, c) do { } while (0)
David Chinner8d280b92006-03-14 13:13:09 +110066#define xfs_icsb_sync_counters(mp) do { } while (0)
67#define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
David Chinner8d280b92006-03-14 13:13:09 +110068
69#endif
70
Christoph Hellwig1df84c92006-01-11 15:29:52 +110071static const struct {
David Chinner8d280b92006-03-14 13:13:09 +110072 short offset;
73 short type; /* 0 = integer
74 * 1 = binary / string (no translation)
75 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070076} xfs_sb_info[] = {
77 { offsetof(xfs_sb_t, sb_magicnum), 0 },
78 { offsetof(xfs_sb_t, sb_blocksize), 0 },
79 { offsetof(xfs_sb_t, sb_dblocks), 0 },
80 { offsetof(xfs_sb_t, sb_rblocks), 0 },
81 { offsetof(xfs_sb_t, sb_rextents), 0 },
82 { offsetof(xfs_sb_t, sb_uuid), 1 },
83 { offsetof(xfs_sb_t, sb_logstart), 0 },
84 { offsetof(xfs_sb_t, sb_rootino), 0 },
85 { offsetof(xfs_sb_t, sb_rbmino), 0 },
86 { offsetof(xfs_sb_t, sb_rsumino), 0 },
87 { offsetof(xfs_sb_t, sb_rextsize), 0 },
88 { offsetof(xfs_sb_t, sb_agblocks), 0 },
89 { offsetof(xfs_sb_t, sb_agcount), 0 },
90 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
91 { offsetof(xfs_sb_t, sb_logblocks), 0 },
92 { offsetof(xfs_sb_t, sb_versionnum), 0 },
93 { offsetof(xfs_sb_t, sb_sectsize), 0 },
94 { offsetof(xfs_sb_t, sb_inodesize), 0 },
95 { offsetof(xfs_sb_t, sb_inopblock), 0 },
96 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
97 { offsetof(xfs_sb_t, sb_blocklog), 0 },
98 { offsetof(xfs_sb_t, sb_sectlog), 0 },
99 { offsetof(xfs_sb_t, sb_inodelog), 0 },
100 { offsetof(xfs_sb_t, sb_inopblog), 0 },
101 { offsetof(xfs_sb_t, sb_agblklog), 0 },
102 { offsetof(xfs_sb_t, sb_rextslog), 0 },
103 { offsetof(xfs_sb_t, sb_inprogress), 0 },
104 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
105 { offsetof(xfs_sb_t, sb_icount), 0 },
106 { offsetof(xfs_sb_t, sb_ifree), 0 },
107 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
108 { offsetof(xfs_sb_t, sb_frextents), 0 },
109 { offsetof(xfs_sb_t, sb_uquotino), 0 },
110 { offsetof(xfs_sb_t, sb_gquotino), 0 },
111 { offsetof(xfs_sb_t, sb_qflags), 0 },
112 { offsetof(xfs_sb_t, sb_flags), 0 },
113 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
114 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
115 { offsetof(xfs_sb_t, sb_unit), 0 },
116 { offsetof(xfs_sb_t, sb_width), 0 },
117 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
118 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
119 { offsetof(xfs_sb_t, sb_logsectsize),0 },
120 { offsetof(xfs_sb_t, sb_logsunit), 0 },
121 { offsetof(xfs_sb_t, sb_features2), 0 },
122 { sizeof(xfs_sb_t), 0 }
123};
124
125/*
126 * Return a pointer to an initialized xfs_mount structure.
127 */
128xfs_mount_t *
129xfs_mount_init(void)
130{
131 xfs_mount_t *mp;
132
David Chinner8d280b92006-03-14 13:13:09 +1100133 mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP);
134
135 if (xfs_icsb_init_counters(mp)) {
136 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
137 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
140 spinlock_init(&mp->m_sb_lock, "xfs_sb");
Jes Sorensen794ee1b2006-01-09 15:59:21 -0800141 mutex_init(&mp->m_ilock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 initnsema(&mp->m_growlock, 1, "xfs_grow");
143 /*
144 * Initialize the AIL.
145 */
146 xfs_trans_ail_init(mp);
147
148 atomic_set(&mp->m_active_trans, 0);
149
150 return mp;
151}
152
153/*
154 * Free up the resources associated with a mount structure. Assume that
155 * the structure was initially zeroed, so we can tell which fields got
156 * initialized.
157 */
158void
159xfs_mount_free(
David Chinner8d280b92006-03-14 13:13:09 +1100160 xfs_mount_t *mp,
161 int remove_bhv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 if (mp->m_ihash)
164 xfs_ihash_free(mp);
165 if (mp->m_chash)
166 xfs_chash_free(mp);
167
168 if (mp->m_perag) {
169 int agno;
170
171 for (agno = 0; agno < mp->m_maxagi; agno++)
172 if (mp->m_perag[agno].pagb_list)
173 kmem_free(mp->m_perag[agno].pagb_list,
174 sizeof(xfs_perag_busy_t) *
175 XFS_PAGB_NUM_SLOTS);
176 kmem_free(mp->m_perag,
177 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
178 }
179
180 AIL_LOCK_DESTROY(&mp->m_ail_lock);
181 spinlock_destroy(&mp->m_sb_lock);
182 mutex_destroy(&mp->m_ilock);
183 freesema(&mp->m_growlock);
184 if (mp->m_quotainfo)
185 XFS_QM_DONE(mp);
186
187 if (mp->m_fsname != NULL)
188 kmem_free(mp->m_fsname, mp->m_fsname_len);
Nathan Scottfc1f8c12005-11-02 11:44:33 +1100189 if (mp->m_rtname != NULL)
190 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
191 if (mp->m_logname != NULL)
192 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 if (remove_bhv) {
Nathan Scottb83bd132006-06-09 16:48:30 +1000195 struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 bhv_remove_all_vfsops(vfsp, 0);
198 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
199 }
200
David Chinner8d280b92006-03-14 13:13:09 +1100201 xfs_icsb_destroy_counters(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 kmem_free(mp, sizeof(xfs_mount_t));
203}
204
205
206/*
207 * Check the validity of the SB found.
208 */
209STATIC int
210xfs_mount_validate_sb(
211 xfs_mount_t *mp,
Nathan Scott764d1f82006-03-31 13:04:17 +1000212 xfs_sb_t *sbp,
213 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215 /*
216 * If the log device and data device have the
217 * same device number, the log is internal.
218 * Consequently, the sb_logstart should be non-zero. If
219 * we have a zero sb_logstart in this case, we may be trying to mount
220 * a volume filesystem in a non-volume manner.
221 */
222 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000223 xfs_fs_mount_cmn_err(flags, "bad magic number");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return XFS_ERROR(EWRONGFS);
225 }
226
227 if (!XFS_SB_GOOD_VERSION(sbp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000228 xfs_fs_mount_cmn_err(flags, "bad version");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return XFS_ERROR(EWRONGFS);
230 }
231
232 if (unlikely(
233 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000234 xfs_fs_mount_cmn_err(flags,
235 "filesystem is marked as having an external log; "
236 "specify logdev on the\nmount command line.");
237 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239
240 if (unlikely(
241 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000242 xfs_fs_mount_cmn_err(flags,
243 "filesystem is marked as having an internal log; "
244 "do not specify logdev on\nthe mount command line.");
245 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 }
247
248 /*
249 * More sanity checking. These were stolen directly from
250 * xfs_repair.
251 */
252 if (unlikely(
253 sbp->sb_agcount <= 0 ||
254 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
255 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
256 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
257 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
258 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
259 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
260 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
261 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
262 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
263 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
Nathan Scott9f989c92006-03-14 13:29:32 +1100264 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
265 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
266 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
268 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
Nathan Scotte50bd162006-04-11 15:10:45 +1000269 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000270 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return XFS_ERROR(EFSCORRUPTED);
272 }
273
274 /*
275 * Sanity check AG count, size fields against data size field
276 */
277 if (unlikely(
278 sbp->sb_dblocks == 0 ||
279 sbp->sb_dblocks >
280 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
281 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
282 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000283 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return XFS_ERROR(EFSCORRUPTED);
285 }
286
287 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
288 ASSERT(sbp->sb_blocklog >= BBSHIFT);
289
290#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
291 if (unlikely(
292 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
293 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
294#else /* Limited by UINT_MAX of sectors */
295 if (unlikely(
296 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
297 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
298#endif
Nathan Scott764d1f82006-03-31 13:04:17 +1000299 xfs_fs_mount_cmn_err(flags,
300 "file system too large to be mounted on this system.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return XFS_ERROR(E2BIG);
302 }
303
304 if (unlikely(sbp->sb_inprogress)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000305 xfs_fs_mount_cmn_err(flags, "file system busy");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return XFS_ERROR(EFSCORRUPTED);
307 }
308
309 /*
Nathan Scottde206142005-05-05 13:24:13 -0700310 * Version 1 directory format has never worked on Linux.
311 */
312 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000313 xfs_fs_mount_cmn_err(flags,
314 "file system using version 1 directory format");
Nathan Scottde206142005-05-05 13:24:13 -0700315 return XFS_ERROR(ENOSYS);
316 }
317
318 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 * Until this is fixed only page-sized or smaller data blocks work.
320 */
321 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000322 xfs_fs_mount_cmn_err(flags,
323 "file system with blocksize %d bytes",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 sbp->sb_blocksize);
Nathan Scott764d1f82006-03-31 13:04:17 +1000325 xfs_fs_mount_cmn_err(flags,
326 "only pagesize (%ld) or less will currently work.",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 PAGE_SIZE);
328 return XFS_ERROR(ENOSYS);
329 }
330
331 return 0;
332}
333
334xfs_agnumber_t
Nathan Scottc11e2c32005-11-02 15:11:45 +1100335xfs_initialize_perag(
Nathan Scottb83bd132006-06-09 16:48:30 +1000336 bhv_vfs_t *vfs,
Nathan Scottc11e2c32005-11-02 15:11:45 +1100337 xfs_mount_t *mp,
338 xfs_agnumber_t agcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339{
340 xfs_agnumber_t index, max_metadata;
341 xfs_perag_t *pag;
342 xfs_agino_t agino;
343 xfs_ino_t ino;
344 xfs_sb_t *sbp = &mp->m_sb;
345 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
346
347 /* Check to see if the filesystem can overflow 32 bit inodes */
348 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
349 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
350
351 /* Clear the mount flag if no inode can overflow 32 bits
352 * on this filesystem, or if specifically requested..
353 */
Nathan Scottc11e2c32005-11-02 15:11:45 +1100354 if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 mp->m_flags |= XFS_MOUNT_32BITINODES;
356 } else {
357 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
358 }
359
360 /* If we can overflow then setup the ag headers accordingly */
361 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
362 /* Calculate how much should be reserved for inodes to
363 * meet the max inode percentage.
364 */
365 if (mp->m_maxicount) {
366 __uint64_t icount;
367
368 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
369 do_div(icount, 100);
370 icount += sbp->sb_agblocks - 1;
Eric Sandeena749ee82005-11-02 15:13:42 +1100371 do_div(icount, sbp->sb_agblocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 max_metadata = icount;
373 } else {
374 max_metadata = agcount;
375 }
376 for (index = 0; index < agcount; index++) {
377 ino = XFS_AGINO_TO_INO(mp, index, agino);
378 if (ino > max_inum) {
379 index++;
380 break;
381 }
382
Nathan Scottc41564b2006-03-29 08:55:14 +1000383 /* This ag is preferred for inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 pag = &mp->m_perag[index];
385 pag->pagi_inodeok = 1;
386 if (index < max_metadata)
387 pag->pagf_metadata = 1;
388 }
389 } else {
390 /* Setup default behavior for smaller filesystems */
391 for (index = 0; index < agcount; index++) {
392 pag = &mp->m_perag[index];
393 pag->pagi_inodeok = 1;
394 }
395 }
396 return index;
397}
398
399/*
400 * xfs_xlatesb
401 *
402 * data - on disk version of sb
403 * sb - a superblock
404 * dir - conversion direction: <0 - convert sb to buf
405 * >0 - convert buf to sb
406 * fields - which fields to copy (bitmask)
407 */
408void
409xfs_xlatesb(
410 void *data,
411 xfs_sb_t *sb,
412 int dir,
413 __int64_t fields)
414{
415 xfs_caddr_t buf_ptr;
416 xfs_caddr_t mem_ptr;
417 xfs_sb_field_t f;
418 int first;
419 int size;
420
421 ASSERT(dir);
422 ASSERT(fields);
423
424 if (!fields)
425 return;
426
427 buf_ptr = (xfs_caddr_t)data;
428 mem_ptr = (xfs_caddr_t)sb;
429
430 while (fields) {
431 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
432 first = xfs_sb_info[f].offset;
433 size = xfs_sb_info[f + 1].offset - first;
434
435 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
436
437 if (size == 1 || xfs_sb_info[f].type == 1) {
438 if (dir > 0) {
439 memcpy(mem_ptr + first, buf_ptr + first, size);
440 } else {
441 memcpy(buf_ptr + first, mem_ptr + first, size);
442 }
443 } else {
444 switch (size) {
445 case 2:
446 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
447 *(__uint16_t*)(mem_ptr+first),
448 dir, ARCH_CONVERT);
449 break;
450 case 4:
451 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
452 *(__uint32_t*)(mem_ptr+first),
453 dir, ARCH_CONVERT);
454 break;
455 case 8:
456 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
457 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
458 break;
459 default:
460 ASSERT(0);
461 }
462 }
463
464 fields &= ~(1LL << f);
465 }
466}
467
468/*
469 * xfs_readsb
470 *
471 * Does the initial read of the superblock.
472 */
473int
Nathan Scott764d1f82006-03-31 13:04:17 +1000474xfs_readsb(xfs_mount_t *mp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 unsigned int sector_size;
477 unsigned int extra_flags;
478 xfs_buf_t *bp;
479 xfs_sb_t *sbp;
480 int error;
481
482 ASSERT(mp->m_sb_bp == NULL);
483 ASSERT(mp->m_ddev_targp != NULL);
484
485 /*
486 * Allocate a (locked) buffer to hold the superblock.
487 * This will be kept around at all times to optimize
488 * access to the superblock.
489 */
490 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
491 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
492
493 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
494 BTOBB(sector_size), extra_flags);
495 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000496 xfs_fs_mount_cmn_err(flags, "SB read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
498 goto fail;
499 }
500 ASSERT(XFS_BUF_ISBUSY(bp));
501 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
502
503 /*
504 * Initialize the mount structure from the superblock.
505 * But first do some basic consistency checking.
506 */
507 sbp = XFS_BUF_TO_SBP(bp);
508 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
509
Nathan Scott764d1f82006-03-31 13:04:17 +1000510 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 if (error) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000512 xfs_fs_mount_cmn_err(flags, "SB validate failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 goto fail;
514 }
515
516 /*
517 * We must be able to do sector-sized and sector-aligned IO.
518 */
519 if (sector_size > mp->m_sb.sb_sectsize) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000520 xfs_fs_mount_cmn_err(flags,
521 "device supports only %u byte sectors (not %u)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 sector_size, mp->m_sb.sb_sectsize);
523 error = ENOSYS;
524 goto fail;
525 }
526
527 /*
528 * If device sector size is smaller than the superblock size,
529 * re-read the superblock so the buffer is correctly sized.
530 */
531 if (sector_size < mp->m_sb.sb_sectsize) {
532 XFS_BUF_UNMANAGE(bp);
533 xfs_buf_relse(bp);
534 sector_size = mp->m_sb.sb_sectsize;
535 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
536 BTOBB(sector_size), extra_flags);
537 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000538 xfs_fs_mount_cmn_err(flags, "SB re-read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
540 goto fail;
541 }
542 ASSERT(XFS_BUF_ISBUSY(bp));
543 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
544 }
545
Lachlan McIlroy5478eea2007-02-10 18:36:29 +1100546 /* Initialize per-cpu counters */
547 xfs_icsb_reinit_counters(mp);
David Chinner8d280b92006-03-14 13:13:09 +1100548
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 mp->m_sb_bp = bp;
550 xfs_buf_relse(bp);
551 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
552 return 0;
553
554 fail:
555 if (bp) {
556 XFS_BUF_UNMANAGE(bp);
557 xfs_buf_relse(bp);
558 }
559 return error;
560}
561
562
563/*
564 * xfs_mount_common
565 *
566 * Mount initialization code establishing various mount
567 * fields from the superblock associated with the given
568 * mount structure
569 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000570STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
572{
573 int i;
574
575 mp->m_agfrotor = mp->m_agirotor = 0;
576 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
577 mp->m_maxagi = mp->m_sb.sb_agcount;
578 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
579 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
580 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
581 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
582 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
583 mp->m_litino = sbp->sb_inodesize -
584 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
585 mp->m_blockmask = sbp->sb_blocksize - 1;
586 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
587 mp->m_blockwmask = mp->m_blockwsize - 1;
588 INIT_LIST_HEAD(&mp->m_del_inodes);
589
590 /*
591 * Setup for attributes, in case they get created.
592 * This value is for inodes getting attributes for the first time,
593 * the per-inode value is for old attribute values.
594 */
595 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
596 switch (sbp->sb_inodesize) {
597 case 256:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100598 mp->m_attroffset = XFS_LITINO(mp) -
599 XFS_BMDR_SPACE_CALC(MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 break;
601 case 512:
602 case 1024:
603 case 2048:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100604 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 break;
606 default:
607 ASSERT(0);
608 }
609 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
610
611 for (i = 0; i < 2; i++) {
612 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
613 xfs_alloc, i == 0);
614 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
615 xfs_alloc, i == 0);
616 }
617 for (i = 0; i < 2; i++) {
618 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
619 xfs_bmbt, i == 0);
620 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
621 xfs_bmbt, i == 0);
622 }
623 for (i = 0; i < 2; i++) {
624 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
625 xfs_inobt, i == 0);
626 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
627 xfs_inobt, i == 0);
628 }
629
630 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
631 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
632 sbp->sb_inopblock);
633 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
634}
635/*
636 * xfs_mountfs
637 *
638 * This function does the following on an initial mount of a file system:
639 * - reads the superblock from disk and init the mount struct
640 * - if we're a 32-bit kernel, do a size check on the superblock
641 * so we don't mount terabyte filesystems
642 * - init mount struct realtime fields
643 * - allocate inode hash table for fs
644 * - init directory manager
645 * - perform recovery and init the log manager
646 */
647int
648xfs_mountfs(
Nathan Scottb83bd132006-06-09 16:48:30 +1000649 bhv_vfs_t *vfsp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 xfs_mount_t *mp,
651 int mfsi_flags)
652{
653 xfs_buf_t *bp;
654 xfs_sb_t *sbp = &(mp->m_sb);
655 xfs_inode_t *rip;
Nathan Scott67fcaa72006-06-09 17:00:52 +1000656 bhv_vnode_t *rvp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 int readio_log, writeio_log;
658 xfs_daddr_t d;
659 __uint64_t ret64;
660 __int64_t update_flags;
661 uint quotamount, quotaflags;
662 int agno;
663 int uuid_mounted = 0;
664 int error = 0;
665
666 if (mp->m_sb_bp == NULL) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000667 if ((error = xfs_readsb(mp, mfsi_flags))) {
Jesper Juhl014c2542006-01-15 02:37:08 +0100668 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 }
670 }
671 xfs_mount_common(mp, sbp);
672
673 /*
674 * Check if sb_agblocks is aligned at stripe boundary
675 * If sb_agblocks is NOT aligned turn off m_dalign since
676 * allocator alignment is within an ag, therefore ag has
677 * to be aligned at stripe boundary.
678 */
679 update_flags = 0LL;
680 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
681 /*
682 * If stripe unit and stripe width are not multiples
683 * of the fs blocksize turn off alignment.
684 */
685 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
686 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
687 if (mp->m_flags & XFS_MOUNT_RETERR) {
688 cmn_err(CE_WARN,
689 "XFS: alignment check 1 failed");
690 error = XFS_ERROR(EINVAL);
691 goto error1;
692 }
693 mp->m_dalign = mp->m_swidth = 0;
694 } else {
695 /*
696 * Convert the stripe unit and width to FSBs.
697 */
698 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
699 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
700 if (mp->m_flags & XFS_MOUNT_RETERR) {
701 error = XFS_ERROR(EINVAL);
702 goto error1;
703 }
704 xfs_fs_cmn_err(CE_WARN, mp,
705"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
706 mp->m_dalign, mp->m_swidth,
707 sbp->sb_agblocks);
708
709 mp->m_dalign = 0;
710 mp->m_swidth = 0;
711 } else if (mp->m_dalign) {
712 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
713 } else {
714 if (mp->m_flags & XFS_MOUNT_RETERR) {
715 xfs_fs_cmn_err(CE_WARN, mp,
716"stripe alignment turned off: sunit(%d) less than bsize(%d)",
717 mp->m_dalign,
718 mp->m_blockmask +1);
719 error = XFS_ERROR(EINVAL);
720 goto error1;
721 }
722 mp->m_swidth = 0;
723 }
724 }
725
726 /*
727 * Update superblock with new values
728 * and log changes
729 */
730 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
731 if (sbp->sb_unit != mp->m_dalign) {
732 sbp->sb_unit = mp->m_dalign;
733 update_flags |= XFS_SB_UNIT;
734 }
735 if (sbp->sb_width != mp->m_swidth) {
736 sbp->sb_width = mp->m_swidth;
737 update_flags |= XFS_SB_WIDTH;
738 }
739 }
740 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
741 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
742 mp->m_dalign = sbp->sb_unit;
743 mp->m_swidth = sbp->sb_width;
744 }
745
746 xfs_alloc_compute_maxlevels(mp);
747 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
748 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
749 xfs_ialloc_compute_maxlevels(mp);
750
751 if (sbp->sb_imax_pct) {
752 __uint64_t icount;
753
754 /* Make sure the maximum inode count is a multiple of the
755 * units we allocate inodes in.
756 */
757
758 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
759 do_div(icount, 100);
760 do_div(icount, mp->m_ialloc_blks);
761 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
762 sbp->sb_inopblog;
763 } else
764 mp->m_maxicount = 0;
765
766 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
767
768 /*
769 * XFS uses the uuid from the superblock as the unique
770 * identifier for fsid. We can not use the uuid from the volume
771 * since a single partition filesystem is identical to a single
772 * partition volume/filesystem.
773 */
774 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
775 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
776 if (xfs_uuid_mount(mp)) {
777 error = XFS_ERROR(EINVAL);
778 goto error1;
779 }
780 uuid_mounted=1;
781 ret64 = uuid_hash64(&sbp->sb_uuid);
782 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
783 }
784
785 /*
786 * Set the default minimum read and write sizes unless
787 * already specified in a mount option.
788 * We use smaller I/O sizes when the file system
789 * is being used for NFS service (wsync mount option).
790 */
791 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
792 if (mp->m_flags & XFS_MOUNT_WSYNC) {
793 readio_log = XFS_WSYNC_READIO_LOG;
794 writeio_log = XFS_WSYNC_WRITEIO_LOG;
795 } else {
796 readio_log = XFS_READIO_LOG_LARGE;
797 writeio_log = XFS_WRITEIO_LOG_LARGE;
798 }
799 } else {
800 readio_log = mp->m_readio_log;
801 writeio_log = mp->m_writeio_log;
802 }
803
804 /*
805 * Set the number of readahead buffers to use based on
806 * physical memory size.
807 */
808 if (xfs_physmem <= 4096) /* <= 16MB */
809 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
810 else if (xfs_physmem <= 8192) /* <= 32MB */
811 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
812 else
813 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
814 if (sbp->sb_blocklog > readio_log) {
815 mp->m_readio_log = sbp->sb_blocklog;
816 } else {
817 mp->m_readio_log = readio_log;
818 }
819 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
820 if (sbp->sb_blocklog > writeio_log) {
821 mp->m_writeio_log = sbp->sb_blocklog;
822 } else {
823 mp->m_writeio_log = writeio_log;
824 }
825 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
826
827 /*
828 * Set the inode cluster size based on the physical memory
829 * size. This may still be overridden by the file system
830 * block size if it is larger than the chosen cluster size.
831 */
832 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
833 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
834 } else {
835 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
836 }
837 /*
838 * Set whether we're using inode alignment.
839 */
840 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
841 mp->m_sb.sb_inoalignmt >=
842 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
843 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
844 else
845 mp->m_inoalign_mask = 0;
846 /*
847 * If we are using stripe alignment, check whether
848 * the stripe unit is a multiple of the inode alignment
849 */
850 if (mp->m_dalign && mp->m_inoalign_mask &&
851 !(mp->m_dalign & mp->m_inoalign_mask))
852 mp->m_sinoalign = mp->m_dalign;
853 else
854 mp->m_sinoalign = 0;
855 /*
856 * Check that the data (and log if separate) are an ok size.
857 */
858 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
859 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
860 cmn_err(CE_WARN, "XFS: size check 1 failed");
861 error = XFS_ERROR(E2BIG);
862 goto error1;
863 }
864 error = xfs_read_buf(mp, mp->m_ddev_targp,
865 d - XFS_FSS_TO_BB(mp, 1),
866 XFS_FSS_TO_BB(mp, 1), 0, &bp);
867 if (!error) {
868 xfs_buf_relse(bp);
869 } else {
870 cmn_err(CE_WARN, "XFS: size check 2 failed");
871 if (error == ENOSPC) {
872 error = XFS_ERROR(E2BIG);
873 }
874 goto error1;
875 }
876
877 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
878 mp->m_logdev_targp != mp->m_ddev_targp) {
879 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
880 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
881 cmn_err(CE_WARN, "XFS: size check 3 failed");
882 error = XFS_ERROR(E2BIG);
883 goto error1;
884 }
885 error = xfs_read_buf(mp, mp->m_logdev_targp,
886 d - XFS_FSB_TO_BB(mp, 1),
887 XFS_FSB_TO_BB(mp, 1), 0, &bp);
888 if (!error) {
889 xfs_buf_relse(bp);
890 } else {
891 cmn_err(CE_WARN, "XFS: size check 3 failed");
892 if (error == ENOSPC) {
893 error = XFS_ERROR(E2BIG);
894 }
895 goto error1;
896 }
897 }
898
899 /*
900 * Initialize realtime fields in the mount structure
901 */
902 if ((error = xfs_rtmount_init(mp))) {
903 cmn_err(CE_WARN, "XFS: RT mount failed");
904 goto error1;
905 }
906
907 /*
908 * For client case we are done now
909 */
910 if (mfsi_flags & XFS_MFSI_CLIENT) {
Jesper Juhl014c2542006-01-15 02:37:08 +0100911 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 }
913
914 /*
915 * Copies the low order bits of the timestamp and the randomly
916 * set "sequence" number out of a UUID.
917 */
918 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
919
920 /*
921 * The vfs structure needs to have a file system independent
922 * way of checking for the invariant file system ID. Since it
923 * can't look at mount structures it has a pointer to the data
924 * in the mount structure.
925 *
926 * File systems that don't support user level file handles (i.e.
927 * all of them except for XFS) will leave vfs_altfsid as NULL.
928 */
929 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
930 mp->m_dmevmask = 0; /* not persistent; set after each mount */
931
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000932 xfs_dir_mount(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 /*
935 * Initialize the attribute manager's entries.
936 */
937 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
938
939 /*
940 * Initialize the precomputed transaction reservations values.
941 */
942 xfs_trans_init(mp);
943
944 /*
945 * Allocate and initialize the inode hash table for this
946 * file system.
947 */
948 xfs_ihash_init(mp);
949 xfs_chash_init(mp);
950
951 /*
952 * Allocate and initialize the per-ag data.
953 */
954 init_rwsem(&mp->m_peraglock);
955 mp->m_perag =
956 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
957
Nathan Scottc11e2c32005-11-02 15:11:45 +1100958 mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
960 /*
961 * log's mount-time initialization. Perform 1st part recovery if needed
962 */
963 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
964 error = xfs_log_mount(mp, mp->m_logdev_targp,
965 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
966 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
967 if (error) {
968 cmn_err(CE_WARN, "XFS: log mount failed");
969 goto error2;
970 }
971 } else { /* No log has been defined */
972 cmn_err(CE_WARN, "XFS: no log defined");
973 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
974 error = XFS_ERROR(EFSCORRUPTED);
975 goto error2;
976 }
977
978 /*
979 * Get and sanity-check the root inode.
980 * Save the pointer to it in the mount structure.
981 */
982 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
983 if (error) {
984 cmn_err(CE_WARN, "XFS: failed to read root inode");
985 goto error3;
986 }
987
988 ASSERT(rip != NULL);
989 rvp = XFS_ITOV(rip);
990
991 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
992 cmn_err(CE_WARN, "XFS: corrupted root inode");
Nathan Scottb6574522006-06-09 15:29:40 +1000993 cmn_err(CE_WARN, "Device %s - root %llu is not a directory",
994 XFS_BUFTARG_NAME(mp->m_ddev_targp),
995 (unsigned long long)rip->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 xfs_iunlock(rip, XFS_ILOCK_EXCL);
997 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
998 mp);
999 error = XFS_ERROR(EFSCORRUPTED);
1000 goto error4;
1001 }
1002 mp->m_rootip = rip; /* save it */
1003
1004 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1005
1006 /*
1007 * Initialize realtime inode pointers in the mount structure
1008 */
1009 if ((error = xfs_rtmount_inodes(mp))) {
1010 /*
1011 * Free up the root inode.
1012 */
1013 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1014 goto error4;
1015 }
1016
1017 /*
1018 * If fs is not mounted readonly, then update the superblock
1019 * unit and width changes.
1020 */
1021 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1022 xfs_mount_log_sbunit(mp, update_flags);
1023
1024 /*
1025 * Initialise the XFS quota management subsystem for this mount
1026 */
1027 if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
1028 goto error4;
1029
1030 /*
1031 * Finish recovering the file system. This part needed to be
1032 * delayed until after the root and real-time bitmap inodes
1033 * were consistently read in.
1034 */
1035 error = xfs_log_mount_finish(mp, mfsi_flags);
1036 if (error) {
1037 cmn_err(CE_WARN, "XFS: log mount finish failed");
1038 goto error4;
1039 }
1040
1041 /*
1042 * Complete the quota initialisation, post-log-replay component.
1043 */
1044 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1045 goto error4;
1046
1047 return 0;
1048
1049 error4:
1050 /*
1051 * Free up the root inode.
1052 */
1053 VN_RELE(rvp);
1054 error3:
1055 xfs_log_unmount_dealloc(mp);
1056 error2:
1057 xfs_ihash_free(mp);
1058 xfs_chash_free(mp);
1059 for (agno = 0; agno < sbp->sb_agcount; agno++)
1060 if (mp->m_perag[agno].pagb_list)
1061 kmem_free(mp->m_perag[agno].pagb_list,
1062 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1063 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1064 mp->m_perag = NULL;
1065 /* FALLTHROUGH */
1066 error1:
1067 if (uuid_mounted)
1068 xfs_uuid_unmount(mp);
1069 xfs_freesb(mp);
1070 return error;
1071}
1072
1073/*
1074 * xfs_unmountfs
1075 *
1076 * This flushes out the inodes,dquots and the superblock, unmounts the
1077 * log and makes sure that incore structures are freed.
1078 */
1079int
1080xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1081{
Nathan Scottb83bd132006-06-09 16:48:30 +10001082 struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1084 int64_t fsid;
1085#endif
1086
Christoph Hellwigefa80272005-06-21 15:37:17 +10001087 xfs_iflush_all(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Nathan Scottee2a4f72006-01-11 15:33:36 +11001089 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 /*
1092 * Flush out the log synchronously so that we know for sure
1093 * that nothing is pinned. This is important because bflush()
1094 * will skip pinned buffers.
1095 */
1096 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1097
1098 xfs_binval(mp->m_ddev_targp);
1099 if (mp->m_rtdev_targp) {
1100 xfs_binval(mp->m_rtdev_targp);
1101 }
1102
1103 xfs_unmountfs_writesb(mp);
1104
1105 xfs_unmountfs_wait(mp); /* wait for async bufs */
1106
1107 xfs_log_unmount(mp); /* Done! No more fs ops. */
1108
1109 xfs_freesb(mp);
1110
1111 /*
1112 * All inodes from this mount point should be freed.
1113 */
1114 ASSERT(mp->m_inodes == NULL);
1115
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 xfs_unmountfs_close(mp, cr);
1117 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1118 xfs_uuid_unmount(mp);
1119
1120#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1121 /*
1122 * clear all error tags on this filesystem
1123 */
1124 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1125 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1126#endif
1127 XFS_IODONE(vfsp);
1128 xfs_mount_free(mp, 1);
1129 return 0;
1130}
1131
1132void
1133xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1134{
1135 if (mp->m_logdev_targp != mp->m_ddev_targp)
1136 xfs_free_buftarg(mp->m_logdev_targp, 1);
1137 if (mp->m_rtdev_targp)
1138 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1139 xfs_free_buftarg(mp->m_ddev_targp, 0);
1140}
1141
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001142STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143xfs_unmountfs_wait(xfs_mount_t *mp)
1144{
1145 if (mp->m_logdev_targp != mp->m_ddev_targp)
1146 xfs_wait_buftarg(mp->m_logdev_targp);
1147 if (mp->m_rtdev_targp)
1148 xfs_wait_buftarg(mp->m_rtdev_targp);
1149 xfs_wait_buftarg(mp->m_ddev_targp);
1150}
1151
1152int
1153xfs_unmountfs_writesb(xfs_mount_t *mp)
1154{
1155 xfs_buf_t *sbp;
1156 xfs_sb_t *sb;
1157 int error = 0;
1158
1159 /*
1160 * skip superblock write if fs is read-only, or
1161 * if we are doing a forced umount.
1162 */
1163 sbp = xfs_getsb(mp, 0);
1164 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1165 XFS_FORCED_SHUTDOWN(mp))) {
David Chinner8d280b92006-03-14 13:13:09 +11001166
1167 xfs_icsb_sync_counters(mp);
1168
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 /*
1170 * mark shared-readonly if desired
1171 */
1172 sb = XFS_BUF_TO_SBP(sbp);
1173 if (mp->m_mk_sharedro) {
1174 if (!(sb->sb_flags & XFS_SBF_READONLY))
1175 sb->sb_flags |= XFS_SBF_READONLY;
1176 if (!XFS_SB_VERSION_HASSHARED(sb))
1177 XFS_SB_VERSION_ADDSHARED(sb);
1178 xfs_fs_cmn_err(CE_NOTE, mp,
1179 "Unmounting, marking shared read-only");
1180 }
1181 XFS_BUF_UNDONE(sbp);
1182 XFS_BUF_UNREAD(sbp);
1183 XFS_BUF_UNDELAYWRITE(sbp);
1184 XFS_BUF_WRITE(sbp);
1185 XFS_BUF_UNASYNC(sbp);
1186 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1187 xfsbdstrat(mp, sbp);
1188 /* Nevermind errors we might get here. */
1189 error = xfs_iowait(sbp);
1190 if (error)
1191 xfs_ioerror_alert("xfs_unmountfs_writesb",
1192 mp, sbp, XFS_BUF_ADDR(sbp));
1193 if (error && mp->m_mk_sharedro)
1194 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1195 }
1196 xfs_buf_relse(sbp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001197 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198}
1199
1200/*
1201 * xfs_mod_sb() can be used to copy arbitrary changes to the
1202 * in-core superblock into the superblock buffer to be logged.
1203 * It does not provide the higher level of locking that is
1204 * needed to protect the in-core superblock from concurrent
1205 * access.
1206 */
1207void
1208xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1209{
1210 xfs_buf_t *bp;
1211 int first;
1212 int last;
1213 xfs_mount_t *mp;
1214 xfs_sb_t *sbp;
1215 xfs_sb_field_t f;
1216
1217 ASSERT(fields);
1218 if (!fields)
1219 return;
1220 mp = tp->t_mountp;
1221 bp = xfs_trans_getsb(tp, mp, 0);
1222 sbp = XFS_BUF_TO_SBP(bp);
1223 first = sizeof(xfs_sb_t);
1224 last = 0;
1225
1226 /* translate/copy */
1227
1228 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1229
1230 /* find modified range */
1231
1232 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1233 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1234 first = xfs_sb_info[f].offset;
1235
1236 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1237 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1238 last = xfs_sb_info[f + 1].offset - 1;
1239
1240 xfs_trans_log_buf(tp, bp, first, last);
1241}
Yingping Lud210a282006-06-09 14:55:18 +10001242
Yingping Lud210a282006-06-09 14:55:18 +10001243
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244/*
1245 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1246 * a delta to a specified field in the in-core superblock. Simply
1247 * switch on the field indicated and apply the delta to that field.
1248 * Fields are not allowed to dip below zero, so if the delta would
1249 * do this do not apply it and return EINVAL.
1250 *
1251 * The SB_LOCK must be held when this routine is called.
1252 */
David Chinner8d280b92006-03-14 13:13:09 +11001253int
David Chinner20f4ebf2007-02-10 18:36:10 +11001254xfs_mod_incore_sb_unlocked(
1255 xfs_mount_t *mp,
1256 xfs_sb_field_t field,
1257 int64_t delta,
1258 int rsvd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259{
1260 int scounter; /* short counter for 32 bit fields */
1261 long long lcounter; /* long counter for 64 bit fields */
1262 long long res_used, rem;
1263
1264 /*
1265 * With the in-core superblock spin lock held, switch
1266 * on the indicated field. Apply the delta to the
1267 * proper field. If the fields value would dip below
1268 * 0, then do not apply the delta and return EINVAL.
1269 */
1270 switch (field) {
1271 case XFS_SBS_ICOUNT:
1272 lcounter = (long long)mp->m_sb.sb_icount;
1273 lcounter += delta;
1274 if (lcounter < 0) {
1275 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001276 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 }
1278 mp->m_sb.sb_icount = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001279 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 case XFS_SBS_IFREE:
1281 lcounter = (long long)mp->m_sb.sb_ifree;
1282 lcounter += delta;
1283 if (lcounter < 0) {
1284 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001285 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 }
1287 mp->m_sb.sb_ifree = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001288 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 case XFS_SBS_FDBLOCKS:
David Chinner4be536d2006-09-07 14:26:50 +10001290 lcounter = (long long)
1291 mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1293
1294 if (delta > 0) { /* Putting blocks back */
1295 if (res_used > delta) {
1296 mp->m_resblks_avail += delta;
1297 } else {
1298 rem = delta - res_used;
1299 mp->m_resblks_avail = mp->m_resblks;
1300 lcounter += rem;
1301 }
1302 } else { /* Taking blocks away */
1303
1304 lcounter += delta;
1305
1306 /*
1307 * If were out of blocks, use any available reserved blocks if
1308 * were allowed to.
1309 */
1310
1311 if (lcounter < 0) {
1312 if (rsvd) {
1313 lcounter = (long long)mp->m_resblks_avail + delta;
1314 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001315 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 }
1317 mp->m_resblks_avail = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001318 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 } else { /* not reserved */
Jesper Juhl014c2542006-01-15 02:37:08 +01001320 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 }
1322 }
1323 }
1324
David Chinner4be536d2006-09-07 14:26:50 +10001325 mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001326 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 case XFS_SBS_FREXTENTS:
1328 lcounter = (long long)mp->m_sb.sb_frextents;
1329 lcounter += delta;
1330 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001331 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 }
1333 mp->m_sb.sb_frextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001334 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 case XFS_SBS_DBLOCKS:
1336 lcounter = (long long)mp->m_sb.sb_dblocks;
1337 lcounter += delta;
1338 if (lcounter < 0) {
1339 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001340 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 }
1342 mp->m_sb.sb_dblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001343 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 case XFS_SBS_AGCOUNT:
1345 scounter = mp->m_sb.sb_agcount;
1346 scounter += delta;
1347 if (scounter < 0) {
1348 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001349 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 }
1351 mp->m_sb.sb_agcount = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001352 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 case XFS_SBS_IMAX_PCT:
1354 scounter = mp->m_sb.sb_imax_pct;
1355 scounter += delta;
1356 if (scounter < 0) {
1357 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001358 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 }
1360 mp->m_sb.sb_imax_pct = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001361 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 case XFS_SBS_REXTSIZE:
1363 scounter = mp->m_sb.sb_rextsize;
1364 scounter += delta;
1365 if (scounter < 0) {
1366 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001367 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 }
1369 mp->m_sb.sb_rextsize = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001370 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 case XFS_SBS_RBMBLOCKS:
1372 scounter = mp->m_sb.sb_rbmblocks;
1373 scounter += delta;
1374 if (scounter < 0) {
1375 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001376 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 }
1378 mp->m_sb.sb_rbmblocks = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001379 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 case XFS_SBS_RBLOCKS:
1381 lcounter = (long long)mp->m_sb.sb_rblocks;
1382 lcounter += delta;
1383 if (lcounter < 0) {
1384 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001385 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 }
1387 mp->m_sb.sb_rblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001388 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 case XFS_SBS_REXTENTS:
1390 lcounter = (long long)mp->m_sb.sb_rextents;
1391 lcounter += delta;
1392 if (lcounter < 0) {
1393 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001394 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 }
1396 mp->m_sb.sb_rextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001397 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 case XFS_SBS_REXTSLOG:
1399 scounter = mp->m_sb.sb_rextslog;
1400 scounter += delta;
1401 if (scounter < 0) {
1402 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001403 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 }
1405 mp->m_sb.sb_rextslog = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 default:
1408 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001409 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 }
1411}
1412
1413/*
1414 * xfs_mod_incore_sb() is used to change a field in the in-core
1415 * superblock structure by the specified delta. This modification
1416 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1417 * routine to do the work.
1418 */
1419int
David Chinner20f4ebf2007-02-10 18:36:10 +11001420xfs_mod_incore_sb(
1421 xfs_mount_t *mp,
1422 xfs_sb_field_t field,
1423 int64_t delta,
1424 int rsvd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425{
1426 unsigned long s;
1427 int status;
1428
David Chinner8d280b92006-03-14 13:13:09 +11001429 /* check for per-cpu counters */
1430 switch (field) {
1431#ifdef HAVE_PERCPU_SB
1432 case XFS_SBS_ICOUNT:
1433 case XFS_SBS_IFREE:
1434 case XFS_SBS_FDBLOCKS:
1435 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1436 status = xfs_icsb_modify_counters(mp, field,
1437 delta, rsvd);
1438 break;
1439 }
1440 /* FALLTHROUGH */
1441#endif
1442 default:
1443 s = XFS_SB_LOCK(mp);
1444 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1445 XFS_SB_UNLOCK(mp, s);
1446 break;
1447 }
1448
Jesper Juhl014c2542006-01-15 02:37:08 +01001449 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450}
1451
1452/*
1453 * xfs_mod_incore_sb_batch() is used to change more than one field
1454 * in the in-core superblock structure at a time. This modification
1455 * is protected by a lock internal to this module. The fields and
1456 * changes to those fields are specified in the array of xfs_mod_sb
1457 * structures passed in.
1458 *
1459 * Either all of the specified deltas will be applied or none of
1460 * them will. If any modified field dips below 0, then all modifications
1461 * will be backed out and EINVAL will be returned.
1462 */
1463int
1464xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1465{
1466 unsigned long s;
1467 int status=0;
1468 xfs_mod_sb_t *msbp;
1469
1470 /*
1471 * Loop through the array of mod structures and apply each
1472 * individually. If any fail, then back out all those
1473 * which have already been applied. Do all of this within
1474 * the scope of the SB_LOCK so that all of the changes will
1475 * be atomic.
1476 */
1477 s = XFS_SB_LOCK(mp);
1478 msbp = &msb[0];
1479 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1480 /*
1481 * Apply the delta at index n. If it fails, break
1482 * from the loop so we'll fall into the undo loop
1483 * below.
1484 */
David Chinner8d280b92006-03-14 13:13:09 +11001485 switch (msbp->msb_field) {
1486#ifdef HAVE_PERCPU_SB
1487 case XFS_SBS_ICOUNT:
1488 case XFS_SBS_IFREE:
1489 case XFS_SBS_FDBLOCKS:
1490 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
David Chinner20b64282007-02-10 18:35:09 +11001491 XFS_SB_UNLOCK(mp, s);
1492 status = xfs_icsb_modify_counters(mp,
David Chinner8d280b92006-03-14 13:13:09 +11001493 msbp->msb_field,
1494 msbp->msb_delta, rsvd);
David Chinner20b64282007-02-10 18:35:09 +11001495 s = XFS_SB_LOCK(mp);
David Chinner8d280b92006-03-14 13:13:09 +11001496 break;
1497 }
1498 /* FALLTHROUGH */
1499#endif
1500 default:
1501 status = xfs_mod_incore_sb_unlocked(mp,
1502 msbp->msb_field,
1503 msbp->msb_delta, rsvd);
1504 break;
1505 }
1506
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 if (status != 0) {
1508 break;
1509 }
1510 }
1511
1512 /*
1513 * If we didn't complete the loop above, then back out
1514 * any changes made to the superblock. If you add code
1515 * between the loop above and here, make sure that you
1516 * preserve the value of status. Loop back until
1517 * we step below the beginning of the array. Make sure
1518 * we don't touch anything back there.
1519 */
1520 if (status != 0) {
1521 msbp--;
1522 while (msbp >= msb) {
David Chinner8d280b92006-03-14 13:13:09 +11001523 switch (msbp->msb_field) {
1524#ifdef HAVE_PERCPU_SB
1525 case XFS_SBS_ICOUNT:
1526 case XFS_SBS_IFREE:
1527 case XFS_SBS_FDBLOCKS:
1528 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
David Chinner20b64282007-02-10 18:35:09 +11001529 XFS_SB_UNLOCK(mp, s);
1530 status = xfs_icsb_modify_counters(mp,
David Chinner8d280b92006-03-14 13:13:09 +11001531 msbp->msb_field,
1532 -(msbp->msb_delta),
1533 rsvd);
David Chinner20b64282007-02-10 18:35:09 +11001534 s = XFS_SB_LOCK(mp);
David Chinner8d280b92006-03-14 13:13:09 +11001535 break;
1536 }
1537 /* FALLTHROUGH */
1538#endif
1539 default:
1540 status = xfs_mod_incore_sb_unlocked(mp,
1541 msbp->msb_field,
1542 -(msbp->msb_delta),
1543 rsvd);
1544 break;
1545 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 ASSERT(status == 0);
1547 msbp--;
1548 }
1549 }
1550 XFS_SB_UNLOCK(mp, s);
Jesper Juhl014c2542006-01-15 02:37:08 +01001551 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552}
1553
1554/*
1555 * xfs_getsb() is called to obtain the buffer for the superblock.
1556 * The buffer is returned locked and read in from disk.
1557 * The buffer should be released with a call to xfs_brelse().
1558 *
1559 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1560 * the superblock buffer if it can be locked without sleeping.
1561 * If it can't then we'll return NULL.
1562 */
1563xfs_buf_t *
1564xfs_getsb(
1565 xfs_mount_t *mp,
1566 int flags)
1567{
1568 xfs_buf_t *bp;
1569
1570 ASSERT(mp->m_sb_bp != NULL);
1571 bp = mp->m_sb_bp;
1572 if (flags & XFS_BUF_TRYLOCK) {
1573 if (!XFS_BUF_CPSEMA(bp)) {
1574 return NULL;
1575 }
1576 } else {
1577 XFS_BUF_PSEMA(bp, PRIBIO);
1578 }
1579 XFS_BUF_HOLD(bp);
1580 ASSERT(XFS_BUF_ISDONE(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001581 return bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582}
1583
1584/*
1585 * Used to free the superblock along various error paths.
1586 */
1587void
1588xfs_freesb(
1589 xfs_mount_t *mp)
1590{
1591 xfs_buf_t *bp;
1592
1593 /*
1594 * Use xfs_getsb() so that the buffer will be locked
1595 * when we call xfs_buf_relse().
1596 */
1597 bp = xfs_getsb(mp, 0);
1598 XFS_BUF_UNMANAGE(bp);
1599 xfs_buf_relse(bp);
1600 mp->m_sb_bp = NULL;
1601}
1602
1603/*
1604 * See if the UUID is unique among mounted XFS filesystems.
1605 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1606 */
1607STATIC int
1608xfs_uuid_mount(
1609 xfs_mount_t *mp)
1610{
1611 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1612 cmn_err(CE_WARN,
1613 "XFS: Filesystem %s has nil UUID - can't mount",
1614 mp->m_fsname);
1615 return -1;
1616 }
1617 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1618 cmn_err(CE_WARN,
1619 "XFS: Filesystem %s has duplicate UUID - can't mount",
1620 mp->m_fsname);
1621 return -1;
1622 }
1623 return 0;
1624}
1625
1626/*
1627 * Remove filesystem from the UUID table.
1628 */
1629STATIC void
1630xfs_uuid_unmount(
1631 xfs_mount_t *mp)
1632{
1633 uuid_table_remove(&mp->m_sb.sb_uuid);
1634}
1635
1636/*
1637 * Used to log changes to the superblock unit and width fields which could
1638 * be altered by the mount options. Only the first superblock is updated.
1639 */
1640STATIC void
1641xfs_mount_log_sbunit(
1642 xfs_mount_t *mp,
1643 __int64_t fields)
1644{
1645 xfs_trans_t *tp;
1646
1647 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1648
1649 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1650 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1651 XFS_DEFAULT_LOG_COUNT)) {
1652 xfs_trans_cancel(tp, 0);
1653 return;
1654 }
1655 xfs_mod_sb(tp, fields);
1656 xfs_trans_commit(tp, 0, NULL);
1657}
David Chinner8d280b92006-03-14 13:13:09 +11001658
1659
1660#ifdef HAVE_PERCPU_SB
1661/*
1662 * Per-cpu incore superblock counters
1663 *
1664 * Simple concept, difficult implementation
1665 *
1666 * Basically, replace the incore superblock counters with a distributed per cpu
1667 * counter for contended fields (e.g. free block count).
1668 *
1669 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1670 * hence needs to be accurately read when we are running low on space. Hence
1671 * there is a method to enable and disable the per-cpu counters based on how
1672 * much "stuff" is available in them.
1673 *
1674 * Basically, a counter is enabled if there is enough free resource to justify
1675 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1676 * ENOSPC), then we disable the counters to synchronise all callers and
1677 * re-distribute the available resources.
1678 *
1679 * If, once we redistributed the available resources, we still get a failure,
1680 * we disable the per-cpu counter and go through the slow path.
1681 *
1682 * The slow path is the current xfs_mod_incore_sb() function. This means that
1683 * when we disable a per-cpu counter, we need to drain it's resources back to
1684 * the global superblock. We do this after disabling the counter to prevent
1685 * more threads from queueing up on the counter.
1686 *
1687 * Essentially, this means that we still need a lock in the fast path to enable
1688 * synchronisation between the global counters and the per-cpu counters. This
1689 * is not a problem because the lock will be local to a CPU almost all the time
1690 * and have little contention except when we get to ENOSPC conditions.
1691 *
1692 * Basically, this lock becomes a barrier that enables us to lock out the fast
1693 * path while we do things like enabling and disabling counters and
1694 * synchronising the counters.
1695 *
1696 * Locking rules:
1697 *
1698 * 1. XFS_SB_LOCK() before picking up per-cpu locks
1699 * 2. per-cpu locks always picked up via for_each_online_cpu() order
1700 * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks
1701 * 4. modifying per-cpu counters requires holding per-cpu lock
1702 * 5. modifying global counters requires holding XFS_SB_LOCK
1703 * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK
1704 * and _none_ of the per-cpu locks.
1705 *
1706 * Disabled counters are only ever re-enabled by a balance operation
1707 * that results in more free resources per CPU than a given threshold.
1708 * To ensure counters don't remain disabled, they are rebalanced when
1709 * the global resource goes above a higher threshold (i.e. some hysteresis
1710 * is present to prevent thrashing).
David Chinner8d280b92006-03-14 13:13:09 +11001711 */
David Chinnere8234a62006-03-14 13:23:52 +11001712
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001713#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11001714/*
1715 * hot-plug CPU notifier support.
1716 *
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001717 * We need a notifier per filesystem as we need to be able to identify
1718 * the filesystem to balance the counters out. This is achieved by
1719 * having a notifier block embedded in the xfs_mount_t and doing pointer
1720 * magic to get the mount pointer from the notifier block address.
David Chinnere8234a62006-03-14 13:23:52 +11001721 */
1722STATIC int
1723xfs_icsb_cpu_notify(
1724 struct notifier_block *nfb,
1725 unsigned long action,
1726 void *hcpu)
1727{
1728 xfs_icsb_cnts_t *cntp;
1729 xfs_mount_t *mp;
1730 int s;
1731
1732 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
1733 cntp = (xfs_icsb_cnts_t *)
1734 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
1735 switch (action) {
1736 case CPU_UP_PREPARE:
1737 /* Easy Case - initialize the area and locks, and
1738 * then rebalance when online does everything else for us. */
David Chinner01e1b692006-03-14 13:29:16 +11001739 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001740 break;
1741 case CPU_ONLINE:
David Chinner03135cf2007-02-10 18:35:15 +11001742 xfs_icsb_lock(mp);
David Chinner20b64282007-02-10 18:35:09 +11001743 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0);
1744 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0);
1745 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0);
David Chinner03135cf2007-02-10 18:35:15 +11001746 xfs_icsb_unlock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11001747 break;
1748 case CPU_DEAD:
1749 /* Disable all the counters, then fold the dead cpu's
1750 * count into the total on the global superblock and
1751 * re-enable the counters. */
David Chinner03135cf2007-02-10 18:35:15 +11001752 xfs_icsb_lock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11001753 s = XFS_SB_LOCK(mp);
1754 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
1755 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
1756 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
1757
1758 mp->m_sb.sb_icount += cntp->icsb_icount;
1759 mp->m_sb.sb_ifree += cntp->icsb_ifree;
1760 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
1761
David Chinner01e1b692006-03-14 13:29:16 +11001762 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001763
David Chinner20b64282007-02-10 18:35:09 +11001764 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT,
1765 XFS_ICSB_SB_LOCKED, 0);
1766 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE,
1767 XFS_ICSB_SB_LOCKED, 0);
1768 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS,
1769 XFS_ICSB_SB_LOCKED, 0);
David Chinnere8234a62006-03-14 13:23:52 +11001770 XFS_SB_UNLOCK(mp, s);
David Chinner03135cf2007-02-10 18:35:15 +11001771 xfs_icsb_unlock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11001772 break;
1773 }
1774
1775 return NOTIFY_OK;
1776}
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001777#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11001778
David Chinner8d280b92006-03-14 13:13:09 +11001779int
1780xfs_icsb_init_counters(
1781 xfs_mount_t *mp)
1782{
1783 xfs_icsb_cnts_t *cntp;
1784 int i;
1785
1786 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
1787 if (mp->m_sb_cnts == NULL)
1788 return -ENOMEM;
1789
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001790#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11001791 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
1792 mp->m_icsb_notifier.priority = 0;
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001793 register_hotcpu_notifier(&mp->m_icsb_notifier);
1794#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11001795
David Chinner8d280b92006-03-14 13:13:09 +11001796 for_each_online_cpu(i) {
1797 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001798 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinner8d280b92006-03-14 13:13:09 +11001799 }
David Chinner20b64282007-02-10 18:35:09 +11001800
1801 mutex_init(&mp->m_icsb_mutex);
1802
David Chinner8d280b92006-03-14 13:13:09 +11001803 /*
1804 * start with all counters disabled so that the
1805 * initial balance kicks us off correctly
1806 */
1807 mp->m_icsb_counters = -1;
1808 return 0;
1809}
1810
Lachlan McIlroy5478eea2007-02-10 18:36:29 +11001811void
1812xfs_icsb_reinit_counters(
1813 xfs_mount_t *mp)
1814{
1815 xfs_icsb_lock(mp);
1816 /*
1817 * start with all counters disabled so that the
1818 * initial balance kicks us off correctly
1819 */
1820 mp->m_icsb_counters = -1;
1821 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0);
1822 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0);
1823 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0);
1824 xfs_icsb_unlock(mp);
1825}
1826
David Chinner8d280b92006-03-14 13:13:09 +11001827STATIC void
1828xfs_icsb_destroy_counters(
1829 xfs_mount_t *mp)
1830{
David Chinnere8234a62006-03-14 13:23:52 +11001831 if (mp->m_sb_cnts) {
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001832 unregister_hotcpu_notifier(&mp->m_icsb_notifier);
David Chinner8d280b92006-03-14 13:13:09 +11001833 free_percpu(mp->m_sb_cnts);
David Chinnere8234a62006-03-14 13:23:52 +11001834 }
David Chinner03135cf2007-02-10 18:35:15 +11001835 mutex_destroy(&mp->m_icsb_mutex);
David Chinner8d280b92006-03-14 13:13:09 +11001836}
1837
David Chinner7989cb82007-02-10 18:34:56 +11001838STATIC_INLINE void
David Chinner01e1b692006-03-14 13:29:16 +11001839xfs_icsb_lock_cntr(
1840 xfs_icsb_cnts_t *icsbp)
1841{
1842 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
1843 ndelay(1000);
1844 }
1845}
1846
David Chinner7989cb82007-02-10 18:34:56 +11001847STATIC_INLINE void
David Chinner01e1b692006-03-14 13:29:16 +11001848xfs_icsb_unlock_cntr(
1849 xfs_icsb_cnts_t *icsbp)
1850{
1851 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
1852}
1853
David Chinner8d280b92006-03-14 13:13:09 +11001854
David Chinner7989cb82007-02-10 18:34:56 +11001855STATIC_INLINE void
David Chinner8d280b92006-03-14 13:13:09 +11001856xfs_icsb_lock_all_counters(
1857 xfs_mount_t *mp)
1858{
1859 xfs_icsb_cnts_t *cntp;
1860 int i;
1861
1862 for_each_online_cpu(i) {
1863 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001864 xfs_icsb_lock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11001865 }
1866}
1867
David Chinner7989cb82007-02-10 18:34:56 +11001868STATIC_INLINE void
David Chinner8d280b92006-03-14 13:13:09 +11001869xfs_icsb_unlock_all_counters(
1870 xfs_mount_t *mp)
1871{
1872 xfs_icsb_cnts_t *cntp;
1873 int i;
1874
1875 for_each_online_cpu(i) {
1876 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001877 xfs_icsb_unlock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11001878 }
1879}
1880
1881STATIC void
1882xfs_icsb_count(
1883 xfs_mount_t *mp,
1884 xfs_icsb_cnts_t *cnt,
1885 int flags)
1886{
1887 xfs_icsb_cnts_t *cntp;
1888 int i;
1889
1890 memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
1891
1892 if (!(flags & XFS_ICSB_LAZY_COUNT))
1893 xfs_icsb_lock_all_counters(mp);
1894
1895 for_each_online_cpu(i) {
1896 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1897 cnt->icsb_icount += cntp->icsb_icount;
1898 cnt->icsb_ifree += cntp->icsb_ifree;
1899 cnt->icsb_fdblocks += cntp->icsb_fdblocks;
1900 }
1901
1902 if (!(flags & XFS_ICSB_LAZY_COUNT))
1903 xfs_icsb_unlock_all_counters(mp);
1904}
1905
1906STATIC int
1907xfs_icsb_counter_disabled(
1908 xfs_mount_t *mp,
1909 xfs_sb_field_t field)
1910{
1911 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1912 return test_bit(field, &mp->m_icsb_counters);
1913}
1914
1915STATIC int
1916xfs_icsb_disable_counter(
1917 xfs_mount_t *mp,
1918 xfs_sb_field_t field)
1919{
1920 xfs_icsb_cnts_t cnt;
1921
1922 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1923
David Chinner20b64282007-02-10 18:35:09 +11001924 /*
1925 * If we are already disabled, then there is nothing to do
1926 * here. We check before locking all the counters to avoid
1927 * the expensive lock operation when being called in the
1928 * slow path and the counter is already disabled. This is
1929 * safe because the only time we set or clear this state is under
1930 * the m_icsb_mutex.
1931 */
1932 if (xfs_icsb_counter_disabled(mp, field))
1933 return 0;
1934
David Chinner8d280b92006-03-14 13:13:09 +11001935 xfs_icsb_lock_all_counters(mp);
1936 if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
1937 /* drain back to superblock */
1938
1939 xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT);
1940 switch(field) {
1941 case XFS_SBS_ICOUNT:
1942 mp->m_sb.sb_icount = cnt.icsb_icount;
1943 break;
1944 case XFS_SBS_IFREE:
1945 mp->m_sb.sb_ifree = cnt.icsb_ifree;
1946 break;
1947 case XFS_SBS_FDBLOCKS:
1948 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
1949 break;
1950 default:
1951 BUG();
1952 }
1953 }
1954
1955 xfs_icsb_unlock_all_counters(mp);
1956
1957 return 0;
1958}
1959
1960STATIC void
1961xfs_icsb_enable_counter(
1962 xfs_mount_t *mp,
1963 xfs_sb_field_t field,
1964 uint64_t count,
1965 uint64_t resid)
1966{
1967 xfs_icsb_cnts_t *cntp;
1968 int i;
1969
1970 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1971
1972 xfs_icsb_lock_all_counters(mp);
1973 for_each_online_cpu(i) {
1974 cntp = per_cpu_ptr(mp->m_sb_cnts, i);
1975 switch (field) {
1976 case XFS_SBS_ICOUNT:
1977 cntp->icsb_icount = count + resid;
1978 break;
1979 case XFS_SBS_IFREE:
1980 cntp->icsb_ifree = count + resid;
1981 break;
1982 case XFS_SBS_FDBLOCKS:
1983 cntp->icsb_fdblocks = count + resid;
1984 break;
1985 default:
1986 BUG();
1987 break;
1988 }
1989 resid = 0;
1990 }
1991 clear_bit(field, &mp->m_icsb_counters);
1992 xfs_icsb_unlock_all_counters(mp);
1993}
1994
David Chinnerdbcabad2007-02-10 18:36:17 +11001995void
1996xfs_icsb_sync_counters_flags(
David Chinner8d280b92006-03-14 13:13:09 +11001997 xfs_mount_t *mp,
1998 int flags)
1999{
2000 xfs_icsb_cnts_t cnt;
2001 int s;
2002
2003 /* Pass 1: lock all counters */
2004 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
2005 s = XFS_SB_LOCK(mp);
2006
2007 xfs_icsb_count(mp, &cnt, flags);
2008
2009 /* Step 3: update mp->m_sb fields */
2010 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
2011 mp->m_sb.sb_icount = cnt.icsb_icount;
2012 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
2013 mp->m_sb.sb_ifree = cnt.icsb_ifree;
2014 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
2015 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
2016
2017 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
2018 XFS_SB_UNLOCK(mp, s);
2019}
2020
2021/*
2022 * Accurate update of per-cpu counters to incore superblock
2023 */
2024STATIC void
2025xfs_icsb_sync_counters(
2026 xfs_mount_t *mp)
2027{
David Chinnerdbcabad2007-02-10 18:36:17 +11002028 xfs_icsb_sync_counters_flags(mp, 0);
David Chinner8d280b92006-03-14 13:13:09 +11002029}
2030
2031/*
2032 * Balance and enable/disable counters as necessary.
2033 *
David Chinner20b64282007-02-10 18:35:09 +11002034 * Thresholds for re-enabling counters are somewhat magic. inode counts are
2035 * chosen to be the same number as single on disk allocation chunk per CPU, and
2036 * free blocks is something far enough zero that we aren't going thrash when we
2037 * get near ENOSPC. We also need to supply a minimum we require per cpu to
2038 * prevent looping endlessly when xfs_alloc_space asks for more than will
2039 * be distributed to a single CPU but each CPU has enough blocks to be
2040 * reenabled.
2041 *
2042 * Note that we can be called when counters are already disabled.
2043 * xfs_icsb_disable_counter() optimises the counter locking in this case to
2044 * prevent locking every per-cpu counter needlessly.
David Chinner8d280b92006-03-14 13:13:09 +11002045 */
David Chinner20b64282007-02-10 18:35:09 +11002046
2047#define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64
David Chinner4be536d2006-09-07 14:26:50 +10002048#define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \
David Chinner20b64282007-02-10 18:35:09 +11002049 (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp))
David Chinner8d280b92006-03-14 13:13:09 +11002050STATIC void
2051xfs_icsb_balance_counter(
2052 xfs_mount_t *mp,
2053 xfs_sb_field_t field,
David Chinner20b64282007-02-10 18:35:09 +11002054 int flags,
2055 int min_per_cpu)
David Chinner8d280b92006-03-14 13:13:09 +11002056{
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002057 uint64_t count, resid;
David Chinner8d280b92006-03-14 13:13:09 +11002058 int weight = num_online_cpus();
2059 int s;
David Chinner20b64282007-02-10 18:35:09 +11002060 uint64_t min = (uint64_t)min_per_cpu;
David Chinner8d280b92006-03-14 13:13:09 +11002061
2062 if (!(flags & XFS_ICSB_SB_LOCKED))
2063 s = XFS_SB_LOCK(mp);
2064
2065 /* disable counter and sync counter */
2066 xfs_icsb_disable_counter(mp, field);
2067
2068 /* update counters - first CPU gets residual*/
2069 switch (field) {
2070 case XFS_SBS_ICOUNT:
2071 count = mp->m_sb.sb_icount;
2072 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002073 if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
David Chinner8d280b92006-03-14 13:13:09 +11002074 goto out;
2075 break;
2076 case XFS_SBS_IFREE:
2077 count = mp->m_sb.sb_ifree;
2078 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002079 if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
David Chinner8d280b92006-03-14 13:13:09 +11002080 goto out;
2081 break;
2082 case XFS_SBS_FDBLOCKS:
2083 count = mp->m_sb.sb_fdblocks;
2084 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002085 if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp)))
David Chinner8d280b92006-03-14 13:13:09 +11002086 goto out;
2087 break;
2088 default:
2089 BUG();
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002090 count = resid = 0; /* quiet, gcc */
David Chinner8d280b92006-03-14 13:13:09 +11002091 break;
2092 }
2093
2094 xfs_icsb_enable_counter(mp, field, count, resid);
2095out:
2096 if (!(flags & XFS_ICSB_SB_LOCKED))
2097 XFS_SB_UNLOCK(mp, s);
2098}
2099
David Chinner20b64282007-02-10 18:35:09 +11002100int
2101xfs_icsb_modify_counters(
David Chinner8d280b92006-03-14 13:13:09 +11002102 xfs_mount_t *mp,
2103 xfs_sb_field_t field,
David Chinner20f4ebf2007-02-10 18:36:10 +11002104 int64_t delta,
David Chinner20b64282007-02-10 18:35:09 +11002105 int rsvd)
David Chinner8d280b92006-03-14 13:13:09 +11002106{
2107 xfs_icsb_cnts_t *icsbp;
2108 long long lcounter; /* long counter for 64 bit fields */
David Chinner20b64282007-02-10 18:35:09 +11002109 int cpu, ret = 0, s;
David Chinner8d280b92006-03-14 13:13:09 +11002110
David Chinner20b64282007-02-10 18:35:09 +11002111 might_sleep();
David Chinner8d280b92006-03-14 13:13:09 +11002112again:
2113 cpu = get_cpu();
David Chinner20b64282007-02-10 18:35:09 +11002114 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu);
2115
2116 /*
2117 * if the counter is disabled, go to slow path
2118 */
David Chinner8d280b92006-03-14 13:13:09 +11002119 if (unlikely(xfs_icsb_counter_disabled(mp, field)))
2120 goto slow_path;
David Chinner20b64282007-02-10 18:35:09 +11002121 xfs_icsb_lock_cntr(icsbp);
2122 if (unlikely(xfs_icsb_counter_disabled(mp, field))) {
2123 xfs_icsb_unlock_cntr(icsbp);
2124 goto slow_path;
2125 }
David Chinner8d280b92006-03-14 13:13:09 +11002126
2127 switch (field) {
2128 case XFS_SBS_ICOUNT:
2129 lcounter = icsbp->icsb_icount;
2130 lcounter += delta;
2131 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002132 goto balance_counter;
David Chinner8d280b92006-03-14 13:13:09 +11002133 icsbp->icsb_icount = lcounter;
2134 break;
2135
2136 case XFS_SBS_IFREE:
2137 lcounter = icsbp->icsb_ifree;
2138 lcounter += delta;
2139 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002140 goto balance_counter;
David Chinner8d280b92006-03-14 13:13:09 +11002141 icsbp->icsb_ifree = lcounter;
2142 break;
2143
2144 case XFS_SBS_FDBLOCKS:
2145 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
2146
David Chinner4be536d2006-09-07 14:26:50 +10002147 lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002148 lcounter += delta;
2149 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002150 goto balance_counter;
David Chinner4be536d2006-09-07 14:26:50 +10002151 icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002152 break;
2153 default:
2154 BUG();
2155 break;
2156 }
David Chinner01e1b692006-03-14 13:29:16 +11002157 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002158 put_cpu();
David Chinner8d280b92006-03-14 13:13:09 +11002159 return 0;
2160
David Chinner8d280b92006-03-14 13:13:09 +11002161slow_path:
David Chinner20b64282007-02-10 18:35:09 +11002162 put_cpu();
2163
2164 /*
2165 * serialise with a mutex so we don't burn lots of cpu on
2166 * the superblock lock. We still need to hold the superblock
2167 * lock, however, when we modify the global structures.
2168 */
David Chinner03135cf2007-02-10 18:35:15 +11002169 xfs_icsb_lock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002170
2171 /*
2172 * Now running atomically.
2173 *
2174 * If the counter is enabled, someone has beaten us to rebalancing.
2175 * Drop the lock and try again in the fast path....
2176 */
2177 if (!(xfs_icsb_counter_disabled(mp, field))) {
David Chinner03135cf2007-02-10 18:35:15 +11002178 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002179 goto again;
2180 }
2181
2182 /*
2183 * The counter is currently disabled. Because we are
2184 * running atomically here, we know a rebalance cannot
2185 * be in progress. Hence we can go straight to operating
2186 * on the global superblock. We do not call xfs_mod_incore_sb()
2187 * here even though we need to get the SB_LOCK. Doing so
2188 * will cause us to re-enter this function and deadlock.
2189 * Hence we get the SB_LOCK ourselves and then call
2190 * xfs_mod_incore_sb_unlocked() as the unlocked path operates
2191 * directly on the global counters.
2192 */
2193 s = XFS_SB_LOCK(mp);
2194 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
2195 XFS_SB_UNLOCK(mp, s);
2196
2197 /*
2198 * Now that we've modified the global superblock, we
2199 * may be able to re-enable the distributed counters
2200 * (e.g. lots of space just got freed). After that
2201 * we are done.
2202 */
2203 if (ret != ENOSPC)
2204 xfs_icsb_balance_counter(mp, field, 0, 0);
David Chinner03135cf2007-02-10 18:35:15 +11002205 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002206 return ret;
2207
2208balance_counter:
David Chinner01e1b692006-03-14 13:29:16 +11002209 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002210 put_cpu();
2211
David Chinner20b64282007-02-10 18:35:09 +11002212 /*
2213 * We may have multiple threads here if multiple per-cpu
2214 * counters run dry at the same time. This will mean we can
2215 * do more balances than strictly necessary but it is not
2216 * the common slowpath case.
2217 */
David Chinner03135cf2007-02-10 18:35:15 +11002218 xfs_icsb_lock(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002219
David Chinner20b64282007-02-10 18:35:09 +11002220 /*
2221 * running atomically.
2222 *
2223 * This will leave the counter in the correct state for future
2224 * accesses. After the rebalance, we simply try again and our retry
2225 * will either succeed through the fast path or slow path without
2226 * another balance operation being required.
2227 */
2228 xfs_icsb_balance_counter(mp, field, 0, delta);
David Chinner03135cf2007-02-10 18:35:15 +11002229 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002230 goto again;
David Chinner8d280b92006-03-14 13:13:09 +11002231}
2232
David Chinner8d280b92006-03-14 13:13:09 +11002233#endif