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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 *);
55STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, int);
56STATIC void xfs_icsb_sync_counters(xfs_mount_t *);
57STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
58 int, int);
59STATIC int xfs_icsb_modify_counters_locked(xfs_mount_t *, xfs_sb_field_t,
60 int, int);
David Chinnere8234a62006-03-14 13:23:52 +110061STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
David Chinner8d280b92006-03-14 13:13:09 +110062
63#else
64
65#define xfs_icsb_destroy_counters(mp) do { } while (0)
66#define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
67#define xfs_icsb_sync_counters(mp) do { } while (0)
68#define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
69#define xfs_icsb_modify_counters_locked(mp, a, b, c) do { } while (0)
70
71#endif
72
Christoph Hellwig1df84c92006-01-11 15:29:52 +110073static const struct {
David Chinner8d280b92006-03-14 13:13:09 +110074 short offset;
75 short type; /* 0 = integer
76 * 1 = binary / string (no translation)
77 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078} xfs_sb_info[] = {
79 { offsetof(xfs_sb_t, sb_magicnum), 0 },
80 { offsetof(xfs_sb_t, sb_blocksize), 0 },
81 { offsetof(xfs_sb_t, sb_dblocks), 0 },
82 { offsetof(xfs_sb_t, sb_rblocks), 0 },
83 { offsetof(xfs_sb_t, sb_rextents), 0 },
84 { offsetof(xfs_sb_t, sb_uuid), 1 },
85 { offsetof(xfs_sb_t, sb_logstart), 0 },
86 { offsetof(xfs_sb_t, sb_rootino), 0 },
87 { offsetof(xfs_sb_t, sb_rbmino), 0 },
88 { offsetof(xfs_sb_t, sb_rsumino), 0 },
89 { offsetof(xfs_sb_t, sb_rextsize), 0 },
90 { offsetof(xfs_sb_t, sb_agblocks), 0 },
91 { offsetof(xfs_sb_t, sb_agcount), 0 },
92 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
93 { offsetof(xfs_sb_t, sb_logblocks), 0 },
94 { offsetof(xfs_sb_t, sb_versionnum), 0 },
95 { offsetof(xfs_sb_t, sb_sectsize), 0 },
96 { offsetof(xfs_sb_t, sb_inodesize), 0 },
97 { offsetof(xfs_sb_t, sb_inopblock), 0 },
98 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
99 { offsetof(xfs_sb_t, sb_blocklog), 0 },
100 { offsetof(xfs_sb_t, sb_sectlog), 0 },
101 { offsetof(xfs_sb_t, sb_inodelog), 0 },
102 { offsetof(xfs_sb_t, sb_inopblog), 0 },
103 { offsetof(xfs_sb_t, sb_agblklog), 0 },
104 { offsetof(xfs_sb_t, sb_rextslog), 0 },
105 { offsetof(xfs_sb_t, sb_inprogress), 0 },
106 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
107 { offsetof(xfs_sb_t, sb_icount), 0 },
108 { offsetof(xfs_sb_t, sb_ifree), 0 },
109 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
110 { offsetof(xfs_sb_t, sb_frextents), 0 },
111 { offsetof(xfs_sb_t, sb_uquotino), 0 },
112 { offsetof(xfs_sb_t, sb_gquotino), 0 },
113 { offsetof(xfs_sb_t, sb_qflags), 0 },
114 { offsetof(xfs_sb_t, sb_flags), 0 },
115 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
116 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
117 { offsetof(xfs_sb_t, sb_unit), 0 },
118 { offsetof(xfs_sb_t, sb_width), 0 },
119 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
120 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
121 { offsetof(xfs_sb_t, sb_logsectsize),0 },
122 { offsetof(xfs_sb_t, sb_logsunit), 0 },
123 { offsetof(xfs_sb_t, sb_features2), 0 },
124 { sizeof(xfs_sb_t), 0 }
125};
126
127/*
128 * Return a pointer to an initialized xfs_mount structure.
129 */
130xfs_mount_t *
131xfs_mount_init(void)
132{
133 xfs_mount_t *mp;
134
David Chinner8d280b92006-03-14 13:13:09 +1100135 mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP);
136
137 if (xfs_icsb_init_counters(mp)) {
138 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
139 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
142 spinlock_init(&mp->m_sb_lock, "xfs_sb");
Jes Sorensen794ee1b2006-01-09 15:59:21 -0800143 mutex_init(&mp->m_ilock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 initnsema(&mp->m_growlock, 1, "xfs_grow");
145 /*
146 * Initialize the AIL.
147 */
148 xfs_trans_ail_init(mp);
149
150 atomic_set(&mp->m_active_trans, 0);
151
152 return mp;
153}
154
155/*
156 * Free up the resources associated with a mount structure. Assume that
157 * the structure was initially zeroed, so we can tell which fields got
158 * initialized.
159 */
160void
161xfs_mount_free(
David Chinner8d280b92006-03-14 13:13:09 +1100162 xfs_mount_t *mp,
163 int remove_bhv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 if (mp->m_ihash)
166 xfs_ihash_free(mp);
167 if (mp->m_chash)
168 xfs_chash_free(mp);
169
170 if (mp->m_perag) {
171 int agno;
172
173 for (agno = 0; agno < mp->m_maxagi; agno++)
174 if (mp->m_perag[agno].pagb_list)
175 kmem_free(mp->m_perag[agno].pagb_list,
176 sizeof(xfs_perag_busy_t) *
177 XFS_PAGB_NUM_SLOTS);
178 kmem_free(mp->m_perag,
179 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
180 }
181
182 AIL_LOCK_DESTROY(&mp->m_ail_lock);
183 spinlock_destroy(&mp->m_sb_lock);
184 mutex_destroy(&mp->m_ilock);
185 freesema(&mp->m_growlock);
186 if (mp->m_quotainfo)
187 XFS_QM_DONE(mp);
188
189 if (mp->m_fsname != NULL)
190 kmem_free(mp->m_fsname, mp->m_fsname_len);
Nathan Scottfc1f8c12005-11-02 11:44:33 +1100191 if (mp->m_rtname != NULL)
192 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
193 if (mp->m_logname != NULL)
194 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 if (remove_bhv) {
Nathan Scottb83bd132006-06-09 16:48:30 +1000197 struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 bhv_remove_all_vfsops(vfsp, 0);
200 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
201 }
202
David Chinner8d280b92006-03-14 13:13:09 +1100203 xfs_icsb_destroy_counters(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 kmem_free(mp, sizeof(xfs_mount_t));
205}
206
207
208/*
209 * Check the validity of the SB found.
210 */
211STATIC int
212xfs_mount_validate_sb(
213 xfs_mount_t *mp,
Nathan Scott764d1f82006-03-31 13:04:17 +1000214 xfs_sb_t *sbp,
215 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
217 /*
218 * If the log device and data device have the
219 * same device number, the log is internal.
220 * Consequently, the sb_logstart should be non-zero. If
221 * we have a zero sb_logstart in this case, we may be trying to mount
222 * a volume filesystem in a non-volume manner.
223 */
224 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000225 xfs_fs_mount_cmn_err(flags, "bad magic number");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return XFS_ERROR(EWRONGFS);
227 }
228
229 if (!XFS_SB_GOOD_VERSION(sbp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000230 xfs_fs_mount_cmn_err(flags, "bad version");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return XFS_ERROR(EWRONGFS);
232 }
233
234 if (unlikely(
235 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000236 xfs_fs_mount_cmn_err(flags,
237 "filesystem is marked as having an external log; "
238 "specify logdev on the\nmount command line.");
239 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241
242 if (unlikely(
243 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000244 xfs_fs_mount_cmn_err(flags,
245 "filesystem is marked as having an internal log; "
246 "do not specify logdev on\nthe mount command line.");
247 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 }
249
250 /*
251 * More sanity checking. These were stolen directly from
252 * xfs_repair.
253 */
254 if (unlikely(
255 sbp->sb_agcount <= 0 ||
256 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
257 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
258 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
259 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
260 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
261 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
262 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
263 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
264 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
265 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
Nathan Scott9f989c92006-03-14 13:29:32 +1100266 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
267 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
268 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
270 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
Nathan Scotte50bd162006-04-11 15:10:45 +1000271 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000272 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 return XFS_ERROR(EFSCORRUPTED);
274 }
275
276 /*
277 * Sanity check AG count, size fields against data size field
278 */
279 if (unlikely(
280 sbp->sb_dblocks == 0 ||
281 sbp->sb_dblocks >
282 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
283 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
284 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000285 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 return XFS_ERROR(EFSCORRUPTED);
287 }
288
289 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
290 ASSERT(sbp->sb_blocklog >= BBSHIFT);
291
292#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
293 if (unlikely(
294 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
295 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
296#else /* Limited by UINT_MAX of sectors */
297 if (unlikely(
298 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
299 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
300#endif
Nathan Scott764d1f82006-03-31 13:04:17 +1000301 xfs_fs_mount_cmn_err(flags,
302 "file system too large to be mounted on this system.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return XFS_ERROR(E2BIG);
304 }
305
306 if (unlikely(sbp->sb_inprogress)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000307 xfs_fs_mount_cmn_err(flags, "file system busy");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 return XFS_ERROR(EFSCORRUPTED);
309 }
310
311 /*
Nathan Scottde206142005-05-05 13:24:13 -0700312 * Version 1 directory format has never worked on Linux.
313 */
314 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000315 xfs_fs_mount_cmn_err(flags,
316 "file system using version 1 directory format");
Nathan Scottde206142005-05-05 13:24:13 -0700317 return XFS_ERROR(ENOSYS);
318 }
319
320 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 * Until this is fixed only page-sized or smaller data blocks work.
322 */
323 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000324 xfs_fs_mount_cmn_err(flags,
325 "file system with blocksize %d bytes",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 sbp->sb_blocksize);
Nathan Scott764d1f82006-03-31 13:04:17 +1000327 xfs_fs_mount_cmn_err(flags,
328 "only pagesize (%ld) or less will currently work.",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 PAGE_SIZE);
330 return XFS_ERROR(ENOSYS);
331 }
332
333 return 0;
334}
335
336xfs_agnumber_t
Nathan Scottc11e2c32005-11-02 15:11:45 +1100337xfs_initialize_perag(
Nathan Scottb83bd132006-06-09 16:48:30 +1000338 bhv_vfs_t *vfs,
Nathan Scottc11e2c32005-11-02 15:11:45 +1100339 xfs_mount_t *mp,
340 xfs_agnumber_t agcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341{
342 xfs_agnumber_t index, max_metadata;
343 xfs_perag_t *pag;
344 xfs_agino_t agino;
345 xfs_ino_t ino;
346 xfs_sb_t *sbp = &mp->m_sb;
347 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
348
349 /* Check to see if the filesystem can overflow 32 bit inodes */
350 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
351 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
352
353 /* Clear the mount flag if no inode can overflow 32 bits
354 * on this filesystem, or if specifically requested..
355 */
Nathan Scottc11e2c32005-11-02 15:11:45 +1100356 if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 mp->m_flags |= XFS_MOUNT_32BITINODES;
358 } else {
359 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
360 }
361
362 /* If we can overflow then setup the ag headers accordingly */
363 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
364 /* Calculate how much should be reserved for inodes to
365 * meet the max inode percentage.
366 */
367 if (mp->m_maxicount) {
368 __uint64_t icount;
369
370 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
371 do_div(icount, 100);
372 icount += sbp->sb_agblocks - 1;
Eric Sandeena749ee82005-11-02 15:13:42 +1100373 do_div(icount, sbp->sb_agblocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 max_metadata = icount;
375 } else {
376 max_metadata = agcount;
377 }
378 for (index = 0; index < agcount; index++) {
379 ino = XFS_AGINO_TO_INO(mp, index, agino);
380 if (ino > max_inum) {
381 index++;
382 break;
383 }
384
Nathan Scottc41564b2006-03-29 08:55:14 +1000385 /* This ag is preferred for inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 pag = &mp->m_perag[index];
387 pag->pagi_inodeok = 1;
388 if (index < max_metadata)
389 pag->pagf_metadata = 1;
390 }
391 } else {
392 /* Setup default behavior for smaller filesystems */
393 for (index = 0; index < agcount; index++) {
394 pag = &mp->m_perag[index];
395 pag->pagi_inodeok = 1;
396 }
397 }
398 return index;
399}
400
401/*
402 * xfs_xlatesb
403 *
404 * data - on disk version of sb
405 * sb - a superblock
406 * dir - conversion direction: <0 - convert sb to buf
407 * >0 - convert buf to sb
408 * fields - which fields to copy (bitmask)
409 */
410void
411xfs_xlatesb(
412 void *data,
413 xfs_sb_t *sb,
414 int dir,
415 __int64_t fields)
416{
417 xfs_caddr_t buf_ptr;
418 xfs_caddr_t mem_ptr;
419 xfs_sb_field_t f;
420 int first;
421 int size;
422
423 ASSERT(dir);
424 ASSERT(fields);
425
426 if (!fields)
427 return;
428
429 buf_ptr = (xfs_caddr_t)data;
430 mem_ptr = (xfs_caddr_t)sb;
431
432 while (fields) {
433 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
434 first = xfs_sb_info[f].offset;
435 size = xfs_sb_info[f + 1].offset - first;
436
437 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
438
439 if (size == 1 || xfs_sb_info[f].type == 1) {
440 if (dir > 0) {
441 memcpy(mem_ptr + first, buf_ptr + first, size);
442 } else {
443 memcpy(buf_ptr + first, mem_ptr + first, size);
444 }
445 } else {
446 switch (size) {
447 case 2:
448 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
449 *(__uint16_t*)(mem_ptr+first),
450 dir, ARCH_CONVERT);
451 break;
452 case 4:
453 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
454 *(__uint32_t*)(mem_ptr+first),
455 dir, ARCH_CONVERT);
456 break;
457 case 8:
458 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
459 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
460 break;
461 default:
462 ASSERT(0);
463 }
464 }
465
466 fields &= ~(1LL << f);
467 }
468}
469
470/*
471 * xfs_readsb
472 *
473 * Does the initial read of the superblock.
474 */
475int
Nathan Scott764d1f82006-03-31 13:04:17 +1000476xfs_readsb(xfs_mount_t *mp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
478 unsigned int sector_size;
479 unsigned int extra_flags;
480 xfs_buf_t *bp;
481 xfs_sb_t *sbp;
482 int error;
483
484 ASSERT(mp->m_sb_bp == NULL);
485 ASSERT(mp->m_ddev_targp != NULL);
486
487 /*
488 * Allocate a (locked) buffer to hold the superblock.
489 * This will be kept around at all times to optimize
490 * access to the superblock.
491 */
492 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
493 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
494
495 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
496 BTOBB(sector_size), extra_flags);
497 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000498 xfs_fs_mount_cmn_err(flags, "SB read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
500 goto fail;
501 }
502 ASSERT(XFS_BUF_ISBUSY(bp));
503 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
504
505 /*
506 * Initialize the mount structure from the superblock.
507 * But first do some basic consistency checking.
508 */
509 sbp = XFS_BUF_TO_SBP(bp);
510 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
511
Nathan Scott764d1f82006-03-31 13:04:17 +1000512 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 if (error) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000514 xfs_fs_mount_cmn_err(flags, "SB validate failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 goto fail;
516 }
517
518 /*
519 * We must be able to do sector-sized and sector-aligned IO.
520 */
521 if (sector_size > mp->m_sb.sb_sectsize) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000522 xfs_fs_mount_cmn_err(flags,
523 "device supports only %u byte sectors (not %u)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 sector_size, mp->m_sb.sb_sectsize);
525 error = ENOSYS;
526 goto fail;
527 }
528
529 /*
530 * If device sector size is smaller than the superblock size,
531 * re-read the superblock so the buffer is correctly sized.
532 */
533 if (sector_size < mp->m_sb.sb_sectsize) {
534 XFS_BUF_UNMANAGE(bp);
535 xfs_buf_relse(bp);
536 sector_size = mp->m_sb.sb_sectsize;
537 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
538 BTOBB(sector_size), extra_flags);
539 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000540 xfs_fs_mount_cmn_err(flags, "SB re-read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
542 goto fail;
543 }
544 ASSERT(XFS_BUF_ISBUSY(bp));
545 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
546 }
547
David Chinner8d280b92006-03-14 13:13:09 +1100548 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
549 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
550 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 mp->m_sb_bp = bp;
553 xfs_buf_relse(bp);
554 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
555 return 0;
556
557 fail:
558 if (bp) {
559 XFS_BUF_UNMANAGE(bp);
560 xfs_buf_relse(bp);
561 }
562 return error;
563}
564
565
566/*
567 * xfs_mount_common
568 *
569 * Mount initialization code establishing various mount
570 * fields from the superblock associated with the given
571 * mount structure
572 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000573STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
575{
576 int i;
577
578 mp->m_agfrotor = mp->m_agirotor = 0;
579 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
580 mp->m_maxagi = mp->m_sb.sb_agcount;
581 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
582 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
583 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
584 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
585 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
586 mp->m_litino = sbp->sb_inodesize -
587 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
588 mp->m_blockmask = sbp->sb_blocksize - 1;
589 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
590 mp->m_blockwmask = mp->m_blockwsize - 1;
591 INIT_LIST_HEAD(&mp->m_del_inodes);
592
593 /*
594 * Setup for attributes, in case they get created.
595 * This value is for inodes getting attributes for the first time,
596 * the per-inode value is for old attribute values.
597 */
598 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
599 switch (sbp->sb_inodesize) {
600 case 256:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100601 mp->m_attroffset = XFS_LITINO(mp) -
602 XFS_BMDR_SPACE_CALC(MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 break;
604 case 512:
605 case 1024:
606 case 2048:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100607 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 break;
609 default:
610 ASSERT(0);
611 }
612 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
613
614 for (i = 0; i < 2; i++) {
615 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
616 xfs_alloc, i == 0);
617 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
618 xfs_alloc, i == 0);
619 }
620 for (i = 0; i < 2; i++) {
621 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
622 xfs_bmbt, i == 0);
623 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
624 xfs_bmbt, i == 0);
625 }
626 for (i = 0; i < 2; i++) {
627 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
628 xfs_inobt, i == 0);
629 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
630 xfs_inobt, i == 0);
631 }
632
633 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
634 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
635 sbp->sb_inopblock);
636 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
637}
638/*
639 * xfs_mountfs
640 *
641 * This function does the following on an initial mount of a file system:
642 * - reads the superblock from disk and init the mount struct
643 * - if we're a 32-bit kernel, do a size check on the superblock
644 * so we don't mount terabyte filesystems
645 * - init mount struct realtime fields
646 * - allocate inode hash table for fs
647 * - init directory manager
648 * - perform recovery and init the log manager
649 */
650int
651xfs_mountfs(
Nathan Scottb83bd132006-06-09 16:48:30 +1000652 bhv_vfs_t *vfsp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 xfs_mount_t *mp,
654 int mfsi_flags)
655{
656 xfs_buf_t *bp;
657 xfs_sb_t *sbp = &(mp->m_sb);
658 xfs_inode_t *rip;
Nathan Scott67fcaa72006-06-09 17:00:52 +1000659 bhv_vnode_t *rvp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 int readio_log, writeio_log;
661 xfs_daddr_t d;
662 __uint64_t ret64;
663 __int64_t update_flags;
664 uint quotamount, quotaflags;
665 int agno;
666 int uuid_mounted = 0;
667 int error = 0;
668
669 if (mp->m_sb_bp == NULL) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000670 if ((error = xfs_readsb(mp, mfsi_flags))) {
Jesper Juhl014c2542006-01-15 02:37:08 +0100671 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 }
673 }
674 xfs_mount_common(mp, sbp);
675
676 /*
677 * Check if sb_agblocks is aligned at stripe boundary
678 * If sb_agblocks is NOT aligned turn off m_dalign since
679 * allocator alignment is within an ag, therefore ag has
680 * to be aligned at stripe boundary.
681 */
682 update_flags = 0LL;
683 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
684 /*
685 * If stripe unit and stripe width are not multiples
686 * of the fs blocksize turn off alignment.
687 */
688 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
689 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
690 if (mp->m_flags & XFS_MOUNT_RETERR) {
691 cmn_err(CE_WARN,
692 "XFS: alignment check 1 failed");
693 error = XFS_ERROR(EINVAL);
694 goto error1;
695 }
696 mp->m_dalign = mp->m_swidth = 0;
697 } else {
698 /*
699 * Convert the stripe unit and width to FSBs.
700 */
701 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
702 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
703 if (mp->m_flags & XFS_MOUNT_RETERR) {
704 error = XFS_ERROR(EINVAL);
705 goto error1;
706 }
707 xfs_fs_cmn_err(CE_WARN, mp,
708"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
709 mp->m_dalign, mp->m_swidth,
710 sbp->sb_agblocks);
711
712 mp->m_dalign = 0;
713 mp->m_swidth = 0;
714 } else if (mp->m_dalign) {
715 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
716 } else {
717 if (mp->m_flags & XFS_MOUNT_RETERR) {
718 xfs_fs_cmn_err(CE_WARN, mp,
719"stripe alignment turned off: sunit(%d) less than bsize(%d)",
720 mp->m_dalign,
721 mp->m_blockmask +1);
722 error = XFS_ERROR(EINVAL);
723 goto error1;
724 }
725 mp->m_swidth = 0;
726 }
727 }
728
729 /*
730 * Update superblock with new values
731 * and log changes
732 */
733 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
734 if (sbp->sb_unit != mp->m_dalign) {
735 sbp->sb_unit = mp->m_dalign;
736 update_flags |= XFS_SB_UNIT;
737 }
738 if (sbp->sb_width != mp->m_swidth) {
739 sbp->sb_width = mp->m_swidth;
740 update_flags |= XFS_SB_WIDTH;
741 }
742 }
743 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
744 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
745 mp->m_dalign = sbp->sb_unit;
746 mp->m_swidth = sbp->sb_width;
747 }
748
749 xfs_alloc_compute_maxlevels(mp);
750 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
751 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
752 xfs_ialloc_compute_maxlevels(mp);
753
754 if (sbp->sb_imax_pct) {
755 __uint64_t icount;
756
757 /* Make sure the maximum inode count is a multiple of the
758 * units we allocate inodes in.
759 */
760
761 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
762 do_div(icount, 100);
763 do_div(icount, mp->m_ialloc_blks);
764 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
765 sbp->sb_inopblog;
766 } else
767 mp->m_maxicount = 0;
768
769 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
770
771 /*
772 * XFS uses the uuid from the superblock as the unique
773 * identifier for fsid. We can not use the uuid from the volume
774 * since a single partition filesystem is identical to a single
775 * partition volume/filesystem.
776 */
777 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
778 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
779 if (xfs_uuid_mount(mp)) {
780 error = XFS_ERROR(EINVAL);
781 goto error1;
782 }
783 uuid_mounted=1;
784 ret64 = uuid_hash64(&sbp->sb_uuid);
785 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
786 }
787
788 /*
789 * Set the default minimum read and write sizes unless
790 * already specified in a mount option.
791 * We use smaller I/O sizes when the file system
792 * is being used for NFS service (wsync mount option).
793 */
794 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
795 if (mp->m_flags & XFS_MOUNT_WSYNC) {
796 readio_log = XFS_WSYNC_READIO_LOG;
797 writeio_log = XFS_WSYNC_WRITEIO_LOG;
798 } else {
799 readio_log = XFS_READIO_LOG_LARGE;
800 writeio_log = XFS_WRITEIO_LOG_LARGE;
801 }
802 } else {
803 readio_log = mp->m_readio_log;
804 writeio_log = mp->m_writeio_log;
805 }
806
807 /*
808 * Set the number of readahead buffers to use based on
809 * physical memory size.
810 */
811 if (xfs_physmem <= 4096) /* <= 16MB */
812 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
813 else if (xfs_physmem <= 8192) /* <= 32MB */
814 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
815 else
816 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
817 if (sbp->sb_blocklog > readio_log) {
818 mp->m_readio_log = sbp->sb_blocklog;
819 } else {
820 mp->m_readio_log = readio_log;
821 }
822 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
823 if (sbp->sb_blocklog > writeio_log) {
824 mp->m_writeio_log = sbp->sb_blocklog;
825 } else {
826 mp->m_writeio_log = writeio_log;
827 }
828 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
829
830 /*
831 * Set the inode cluster size based on the physical memory
832 * size. This may still be overridden by the file system
833 * block size if it is larger than the chosen cluster size.
834 */
835 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
836 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
837 } else {
838 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
839 }
840 /*
841 * Set whether we're using inode alignment.
842 */
843 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
844 mp->m_sb.sb_inoalignmt >=
845 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
846 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
847 else
848 mp->m_inoalign_mask = 0;
849 /*
850 * If we are using stripe alignment, check whether
851 * the stripe unit is a multiple of the inode alignment
852 */
853 if (mp->m_dalign && mp->m_inoalign_mask &&
854 !(mp->m_dalign & mp->m_inoalign_mask))
855 mp->m_sinoalign = mp->m_dalign;
856 else
857 mp->m_sinoalign = 0;
858 /*
859 * Check that the data (and log if separate) are an ok size.
860 */
861 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
862 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
863 cmn_err(CE_WARN, "XFS: size check 1 failed");
864 error = XFS_ERROR(E2BIG);
865 goto error1;
866 }
867 error = xfs_read_buf(mp, mp->m_ddev_targp,
868 d - XFS_FSS_TO_BB(mp, 1),
869 XFS_FSS_TO_BB(mp, 1), 0, &bp);
870 if (!error) {
871 xfs_buf_relse(bp);
872 } else {
873 cmn_err(CE_WARN, "XFS: size check 2 failed");
874 if (error == ENOSPC) {
875 error = XFS_ERROR(E2BIG);
876 }
877 goto error1;
878 }
879
880 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
881 mp->m_logdev_targp != mp->m_ddev_targp) {
882 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
883 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
884 cmn_err(CE_WARN, "XFS: size check 3 failed");
885 error = XFS_ERROR(E2BIG);
886 goto error1;
887 }
888 error = xfs_read_buf(mp, mp->m_logdev_targp,
889 d - XFS_FSB_TO_BB(mp, 1),
890 XFS_FSB_TO_BB(mp, 1), 0, &bp);
891 if (!error) {
892 xfs_buf_relse(bp);
893 } else {
894 cmn_err(CE_WARN, "XFS: size check 3 failed");
895 if (error == ENOSPC) {
896 error = XFS_ERROR(E2BIG);
897 }
898 goto error1;
899 }
900 }
901
902 /*
903 * Initialize realtime fields in the mount structure
904 */
905 if ((error = xfs_rtmount_init(mp))) {
906 cmn_err(CE_WARN, "XFS: RT mount failed");
907 goto error1;
908 }
909
910 /*
911 * For client case we are done now
912 */
913 if (mfsi_flags & XFS_MFSI_CLIENT) {
Jesper Juhl014c2542006-01-15 02:37:08 +0100914 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 }
916
917 /*
918 * Copies the low order bits of the timestamp and the randomly
919 * set "sequence" number out of a UUID.
920 */
921 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
922
923 /*
924 * The vfs structure needs to have a file system independent
925 * way of checking for the invariant file system ID. Since it
926 * can't look at mount structures it has a pointer to the data
927 * in the mount structure.
928 *
929 * File systems that don't support user level file handles (i.e.
930 * all of them except for XFS) will leave vfs_altfsid as NULL.
931 */
932 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
933 mp->m_dmevmask = 0; /* not persistent; set after each mount */
934
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000935 xfs_dir_mount(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 /*
938 * Initialize the attribute manager's entries.
939 */
940 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
941
942 /*
943 * Initialize the precomputed transaction reservations values.
944 */
945 xfs_trans_init(mp);
946
947 /*
948 * Allocate and initialize the inode hash table for this
949 * file system.
950 */
951 xfs_ihash_init(mp);
952 xfs_chash_init(mp);
953
954 /*
955 * Allocate and initialize the per-ag data.
956 */
957 init_rwsem(&mp->m_peraglock);
958 mp->m_perag =
959 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
960
Nathan Scottc11e2c32005-11-02 15:11:45 +1100961 mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
963 /*
964 * log's mount-time initialization. Perform 1st part recovery if needed
965 */
966 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
967 error = xfs_log_mount(mp, mp->m_logdev_targp,
968 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
969 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
970 if (error) {
971 cmn_err(CE_WARN, "XFS: log mount failed");
972 goto error2;
973 }
974 } else { /* No log has been defined */
975 cmn_err(CE_WARN, "XFS: no log defined");
976 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
977 error = XFS_ERROR(EFSCORRUPTED);
978 goto error2;
979 }
980
981 /*
982 * Get and sanity-check the root inode.
983 * Save the pointer to it in the mount structure.
984 */
985 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
986 if (error) {
987 cmn_err(CE_WARN, "XFS: failed to read root inode");
988 goto error3;
989 }
990
991 ASSERT(rip != NULL);
992 rvp = XFS_ITOV(rip);
993
994 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
995 cmn_err(CE_WARN, "XFS: corrupted root inode");
Nathan Scottb6574522006-06-09 15:29:40 +1000996 cmn_err(CE_WARN, "Device %s - root %llu is not a directory",
997 XFS_BUFTARG_NAME(mp->m_ddev_targp),
998 (unsigned long long)rip->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1000 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
1001 mp);
1002 error = XFS_ERROR(EFSCORRUPTED);
1003 goto error4;
1004 }
1005 mp->m_rootip = rip; /* save it */
1006
1007 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1008
1009 /*
1010 * Initialize realtime inode pointers in the mount structure
1011 */
1012 if ((error = xfs_rtmount_inodes(mp))) {
1013 /*
1014 * Free up the root inode.
1015 */
1016 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1017 goto error4;
1018 }
1019
1020 /*
1021 * If fs is not mounted readonly, then update the superblock
1022 * unit and width changes.
1023 */
1024 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1025 xfs_mount_log_sbunit(mp, update_flags);
1026
1027 /*
1028 * Initialise the XFS quota management subsystem for this mount
1029 */
1030 if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
1031 goto error4;
1032
1033 /*
1034 * Finish recovering the file system. This part needed to be
1035 * delayed until after the root and real-time bitmap inodes
1036 * were consistently read in.
1037 */
1038 error = xfs_log_mount_finish(mp, mfsi_flags);
1039 if (error) {
1040 cmn_err(CE_WARN, "XFS: log mount finish failed");
1041 goto error4;
1042 }
1043
1044 /*
1045 * Complete the quota initialisation, post-log-replay component.
1046 */
1047 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1048 goto error4;
1049
1050 return 0;
1051
1052 error4:
1053 /*
1054 * Free up the root inode.
1055 */
1056 VN_RELE(rvp);
1057 error3:
1058 xfs_log_unmount_dealloc(mp);
1059 error2:
1060 xfs_ihash_free(mp);
1061 xfs_chash_free(mp);
1062 for (agno = 0; agno < sbp->sb_agcount; agno++)
1063 if (mp->m_perag[agno].pagb_list)
1064 kmem_free(mp->m_perag[agno].pagb_list,
1065 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1066 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1067 mp->m_perag = NULL;
1068 /* FALLTHROUGH */
1069 error1:
1070 if (uuid_mounted)
1071 xfs_uuid_unmount(mp);
1072 xfs_freesb(mp);
1073 return error;
1074}
1075
1076/*
1077 * xfs_unmountfs
1078 *
1079 * This flushes out the inodes,dquots and the superblock, unmounts the
1080 * log and makes sure that incore structures are freed.
1081 */
1082int
1083xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1084{
Nathan Scottb83bd132006-06-09 16:48:30 +10001085 struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1087 int64_t fsid;
1088#endif
1089
Christoph Hellwigefa80272005-06-21 15:37:17 +10001090 xfs_iflush_all(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
Nathan Scottee2a4f72006-01-11 15:33:36 +11001092 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094 /*
1095 * Flush out the log synchronously so that we know for sure
1096 * that nothing is pinned. This is important because bflush()
1097 * will skip pinned buffers.
1098 */
1099 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1100
1101 xfs_binval(mp->m_ddev_targp);
1102 if (mp->m_rtdev_targp) {
1103 xfs_binval(mp->m_rtdev_targp);
1104 }
1105
1106 xfs_unmountfs_writesb(mp);
1107
1108 xfs_unmountfs_wait(mp); /* wait for async bufs */
1109
1110 xfs_log_unmount(mp); /* Done! No more fs ops. */
1111
1112 xfs_freesb(mp);
1113
1114 /*
1115 * All inodes from this mount point should be freed.
1116 */
1117 ASSERT(mp->m_inodes == NULL);
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 xfs_unmountfs_close(mp, cr);
1120 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1121 xfs_uuid_unmount(mp);
1122
1123#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1124 /*
1125 * clear all error tags on this filesystem
1126 */
1127 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1128 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1129#endif
1130 XFS_IODONE(vfsp);
1131 xfs_mount_free(mp, 1);
1132 return 0;
1133}
1134
1135void
1136xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1137{
1138 if (mp->m_logdev_targp != mp->m_ddev_targp)
1139 xfs_free_buftarg(mp->m_logdev_targp, 1);
1140 if (mp->m_rtdev_targp)
1141 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1142 xfs_free_buftarg(mp->m_ddev_targp, 0);
1143}
1144
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001145STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146xfs_unmountfs_wait(xfs_mount_t *mp)
1147{
1148 if (mp->m_logdev_targp != mp->m_ddev_targp)
1149 xfs_wait_buftarg(mp->m_logdev_targp);
1150 if (mp->m_rtdev_targp)
1151 xfs_wait_buftarg(mp->m_rtdev_targp);
1152 xfs_wait_buftarg(mp->m_ddev_targp);
1153}
1154
1155int
1156xfs_unmountfs_writesb(xfs_mount_t *mp)
1157{
1158 xfs_buf_t *sbp;
1159 xfs_sb_t *sb;
1160 int error = 0;
1161
1162 /*
1163 * skip superblock write if fs is read-only, or
1164 * if we are doing a forced umount.
1165 */
1166 sbp = xfs_getsb(mp, 0);
1167 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1168 XFS_FORCED_SHUTDOWN(mp))) {
David Chinner8d280b92006-03-14 13:13:09 +11001169
1170 xfs_icsb_sync_counters(mp);
1171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 /*
1173 * mark shared-readonly if desired
1174 */
1175 sb = XFS_BUF_TO_SBP(sbp);
1176 if (mp->m_mk_sharedro) {
1177 if (!(sb->sb_flags & XFS_SBF_READONLY))
1178 sb->sb_flags |= XFS_SBF_READONLY;
1179 if (!XFS_SB_VERSION_HASSHARED(sb))
1180 XFS_SB_VERSION_ADDSHARED(sb);
1181 xfs_fs_cmn_err(CE_NOTE, mp,
1182 "Unmounting, marking shared read-only");
1183 }
1184 XFS_BUF_UNDONE(sbp);
1185 XFS_BUF_UNREAD(sbp);
1186 XFS_BUF_UNDELAYWRITE(sbp);
1187 XFS_BUF_WRITE(sbp);
1188 XFS_BUF_UNASYNC(sbp);
1189 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1190 xfsbdstrat(mp, sbp);
1191 /* Nevermind errors we might get here. */
1192 error = xfs_iowait(sbp);
1193 if (error)
1194 xfs_ioerror_alert("xfs_unmountfs_writesb",
1195 mp, sbp, XFS_BUF_ADDR(sbp));
1196 if (error && mp->m_mk_sharedro)
1197 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1198 }
1199 xfs_buf_relse(sbp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001200 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201}
1202
1203/*
1204 * xfs_mod_sb() can be used to copy arbitrary changes to the
1205 * in-core superblock into the superblock buffer to be logged.
1206 * It does not provide the higher level of locking that is
1207 * needed to protect the in-core superblock from concurrent
1208 * access.
1209 */
1210void
1211xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1212{
1213 xfs_buf_t *bp;
1214 int first;
1215 int last;
1216 xfs_mount_t *mp;
1217 xfs_sb_t *sbp;
1218 xfs_sb_field_t f;
1219
1220 ASSERT(fields);
1221 if (!fields)
1222 return;
1223 mp = tp->t_mountp;
1224 bp = xfs_trans_getsb(tp, mp, 0);
1225 sbp = XFS_BUF_TO_SBP(bp);
1226 first = sizeof(xfs_sb_t);
1227 last = 0;
1228
1229 /* translate/copy */
1230
1231 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1232
1233 /* find modified range */
1234
1235 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1236 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1237 first = xfs_sb_info[f].offset;
1238
1239 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1240 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1241 last = xfs_sb_info[f + 1].offset - 1;
1242
1243 xfs_trans_log_buf(tp, bp, first, last);
1244}
Yingping Lud210a282006-06-09 14:55:18 +10001245
1246/*
1247 * In order to avoid ENOSPC-related deadlock caused by
1248 * out-of-order locking of AGF buffer (PV 947395), we place
1249 * constraints on the relationship among actual allocations for
1250 * data blocks, freelist blocks, and potential file data bmap
1251 * btree blocks. However, these restrictions may result in no
1252 * actual space allocated for a delayed extent, for example, a data
1253 * block in a certain AG is allocated but there is no additional
1254 * block for the additional bmap btree block due to a split of the
1255 * bmap btree of the file. The result of this may lead to an
1256 * infinite loop in xfssyncd when the file gets flushed to disk and
1257 * all delayed extents need to be actually allocated. To get around
1258 * this, we explicitly set aside a few blocks which will not be
1259 * reserved in delayed allocation. Considering the minimum number of
1260 * needed freelist blocks is 4 fsbs, a potential split of file's bmap
1261 * btree requires 1 fsb, so we set the number of set-aside blocks to 8.
1262*/
1263#define SET_ASIDE_BLOCKS 8
1264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265/*
1266 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1267 * a delta to a specified field in the in-core superblock. Simply
1268 * switch on the field indicated and apply the delta to that field.
1269 * Fields are not allowed to dip below zero, so if the delta would
1270 * do this do not apply it and return EINVAL.
1271 *
1272 * The SB_LOCK must be held when this routine is called.
1273 */
David Chinner8d280b92006-03-14 13:13:09 +11001274int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
1276 int delta, int rsvd)
1277{
1278 int scounter; /* short counter for 32 bit fields */
1279 long long lcounter; /* long counter for 64 bit fields */
1280 long long res_used, rem;
1281
1282 /*
1283 * With the in-core superblock spin lock held, switch
1284 * on the indicated field. Apply the delta to the
1285 * proper field. If the fields value would dip below
1286 * 0, then do not apply the delta and return EINVAL.
1287 */
1288 switch (field) {
1289 case XFS_SBS_ICOUNT:
1290 lcounter = (long long)mp->m_sb.sb_icount;
1291 lcounter += delta;
1292 if (lcounter < 0) {
1293 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001294 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 }
1296 mp->m_sb.sb_icount = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001297 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 case XFS_SBS_IFREE:
1299 lcounter = (long long)mp->m_sb.sb_ifree;
1300 lcounter += delta;
1301 if (lcounter < 0) {
1302 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001303 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 }
1305 mp->m_sb.sb_ifree = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001306 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 case XFS_SBS_FDBLOCKS:
1308
Yingping Lud210a282006-06-09 14:55:18 +10001309 lcounter = (long long)mp->m_sb.sb_fdblocks - SET_ASIDE_BLOCKS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1311
1312 if (delta > 0) { /* Putting blocks back */
1313 if (res_used > delta) {
1314 mp->m_resblks_avail += delta;
1315 } else {
1316 rem = delta - res_used;
1317 mp->m_resblks_avail = mp->m_resblks;
1318 lcounter += rem;
1319 }
1320 } else { /* Taking blocks away */
1321
1322 lcounter += delta;
1323
1324 /*
1325 * If were out of blocks, use any available reserved blocks if
1326 * were allowed to.
1327 */
1328
1329 if (lcounter < 0) {
1330 if (rsvd) {
1331 lcounter = (long long)mp->m_resblks_avail + delta;
1332 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001333 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 }
1335 mp->m_resblks_avail = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001336 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 } else { /* not reserved */
Jesper Juhl014c2542006-01-15 02:37:08 +01001338 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 }
1340 }
1341 }
1342
Yingping Lud210a282006-06-09 14:55:18 +10001343 mp->m_sb.sb_fdblocks = lcounter + SET_ASIDE_BLOCKS;
Jesper Juhl014c2542006-01-15 02:37:08 +01001344 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 case XFS_SBS_FREXTENTS:
1346 lcounter = (long long)mp->m_sb.sb_frextents;
1347 lcounter += delta;
1348 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001349 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 }
1351 mp->m_sb.sb_frextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001352 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 case XFS_SBS_DBLOCKS:
1354 lcounter = (long long)mp->m_sb.sb_dblocks;
1355 lcounter += delta;
1356 if (lcounter < 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_dblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001361 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 case XFS_SBS_AGCOUNT:
1363 scounter = mp->m_sb.sb_agcount;
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_agcount = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001370 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 case XFS_SBS_IMAX_PCT:
1372 scounter = mp->m_sb.sb_imax_pct;
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_imax_pct = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001379 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 case XFS_SBS_REXTSIZE:
1381 scounter = mp->m_sb.sb_rextsize;
1382 scounter += delta;
1383 if (scounter < 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_rextsize = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001388 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 case XFS_SBS_RBMBLOCKS:
1390 scounter = mp->m_sb.sb_rbmblocks;
1391 scounter += delta;
1392 if (scounter < 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_rbmblocks = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001397 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 case XFS_SBS_RBLOCKS:
1399 lcounter = (long long)mp->m_sb.sb_rblocks;
1400 lcounter += delta;
1401 if (lcounter < 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_rblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 case XFS_SBS_REXTENTS:
1408 lcounter = (long long)mp->m_sb.sb_rextents;
1409 lcounter += delta;
1410 if (lcounter < 0) {
1411 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001412 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 }
1414 mp->m_sb.sb_rextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001415 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 case XFS_SBS_REXTSLOG:
1417 scounter = mp->m_sb.sb_rextslog;
1418 scounter += delta;
1419 if (scounter < 0) {
1420 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001421 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 }
1423 mp->m_sb.sb_rextslog = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001424 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 default:
1426 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001427 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 }
1429}
1430
1431/*
1432 * xfs_mod_incore_sb() is used to change a field in the in-core
1433 * superblock structure by the specified delta. This modification
1434 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1435 * routine to do the work.
1436 */
1437int
1438xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
1439{
1440 unsigned long s;
1441 int status;
1442
David Chinner8d280b92006-03-14 13:13:09 +11001443 /* check for per-cpu counters */
1444 switch (field) {
1445#ifdef HAVE_PERCPU_SB
1446 case XFS_SBS_ICOUNT:
1447 case XFS_SBS_IFREE:
1448 case XFS_SBS_FDBLOCKS:
1449 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1450 status = xfs_icsb_modify_counters(mp, field,
1451 delta, rsvd);
1452 break;
1453 }
1454 /* FALLTHROUGH */
1455#endif
1456 default:
1457 s = XFS_SB_LOCK(mp);
1458 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1459 XFS_SB_UNLOCK(mp, s);
1460 break;
1461 }
1462
Jesper Juhl014c2542006-01-15 02:37:08 +01001463 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464}
1465
1466/*
1467 * xfs_mod_incore_sb_batch() is used to change more than one field
1468 * in the in-core superblock structure at a time. This modification
1469 * is protected by a lock internal to this module. The fields and
1470 * changes to those fields are specified in the array of xfs_mod_sb
1471 * structures passed in.
1472 *
1473 * Either all of the specified deltas will be applied or none of
1474 * them will. If any modified field dips below 0, then all modifications
1475 * will be backed out and EINVAL will be returned.
1476 */
1477int
1478xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1479{
1480 unsigned long s;
1481 int status=0;
1482 xfs_mod_sb_t *msbp;
1483
1484 /*
1485 * Loop through the array of mod structures and apply each
1486 * individually. If any fail, then back out all those
1487 * which have already been applied. Do all of this within
1488 * the scope of the SB_LOCK so that all of the changes will
1489 * be atomic.
1490 */
1491 s = XFS_SB_LOCK(mp);
1492 msbp = &msb[0];
1493 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1494 /*
1495 * Apply the delta at index n. If it fails, break
1496 * from the loop so we'll fall into the undo loop
1497 * below.
1498 */
David Chinner8d280b92006-03-14 13:13:09 +11001499 switch (msbp->msb_field) {
1500#ifdef HAVE_PERCPU_SB
1501 case XFS_SBS_ICOUNT:
1502 case XFS_SBS_IFREE:
1503 case XFS_SBS_FDBLOCKS:
1504 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1505 status = xfs_icsb_modify_counters_locked(mp,
1506 msbp->msb_field,
1507 msbp->msb_delta, rsvd);
1508 break;
1509 }
1510 /* FALLTHROUGH */
1511#endif
1512 default:
1513 status = xfs_mod_incore_sb_unlocked(mp,
1514 msbp->msb_field,
1515 msbp->msb_delta, rsvd);
1516 break;
1517 }
1518
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 if (status != 0) {
1520 break;
1521 }
1522 }
1523
1524 /*
1525 * If we didn't complete the loop above, then back out
1526 * any changes made to the superblock. If you add code
1527 * between the loop above and here, make sure that you
1528 * preserve the value of status. Loop back until
1529 * we step below the beginning of the array. Make sure
1530 * we don't touch anything back there.
1531 */
1532 if (status != 0) {
1533 msbp--;
1534 while (msbp >= msb) {
David Chinner8d280b92006-03-14 13:13:09 +11001535 switch (msbp->msb_field) {
1536#ifdef HAVE_PERCPU_SB
1537 case XFS_SBS_ICOUNT:
1538 case XFS_SBS_IFREE:
1539 case XFS_SBS_FDBLOCKS:
1540 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1541 status =
1542 xfs_icsb_modify_counters_locked(mp,
1543 msbp->msb_field,
1544 -(msbp->msb_delta),
1545 rsvd);
1546 break;
1547 }
1548 /* FALLTHROUGH */
1549#endif
1550 default:
1551 status = xfs_mod_incore_sb_unlocked(mp,
1552 msbp->msb_field,
1553 -(msbp->msb_delta),
1554 rsvd);
1555 break;
1556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 ASSERT(status == 0);
1558 msbp--;
1559 }
1560 }
1561 XFS_SB_UNLOCK(mp, s);
Jesper Juhl014c2542006-01-15 02:37:08 +01001562 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563}
1564
1565/*
1566 * xfs_getsb() is called to obtain the buffer for the superblock.
1567 * The buffer is returned locked and read in from disk.
1568 * The buffer should be released with a call to xfs_brelse().
1569 *
1570 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1571 * the superblock buffer if it can be locked without sleeping.
1572 * If it can't then we'll return NULL.
1573 */
1574xfs_buf_t *
1575xfs_getsb(
1576 xfs_mount_t *mp,
1577 int flags)
1578{
1579 xfs_buf_t *bp;
1580
1581 ASSERT(mp->m_sb_bp != NULL);
1582 bp = mp->m_sb_bp;
1583 if (flags & XFS_BUF_TRYLOCK) {
1584 if (!XFS_BUF_CPSEMA(bp)) {
1585 return NULL;
1586 }
1587 } else {
1588 XFS_BUF_PSEMA(bp, PRIBIO);
1589 }
1590 XFS_BUF_HOLD(bp);
1591 ASSERT(XFS_BUF_ISDONE(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001592 return bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593}
1594
1595/*
1596 * Used to free the superblock along various error paths.
1597 */
1598void
1599xfs_freesb(
1600 xfs_mount_t *mp)
1601{
1602 xfs_buf_t *bp;
1603
1604 /*
1605 * Use xfs_getsb() so that the buffer will be locked
1606 * when we call xfs_buf_relse().
1607 */
1608 bp = xfs_getsb(mp, 0);
1609 XFS_BUF_UNMANAGE(bp);
1610 xfs_buf_relse(bp);
1611 mp->m_sb_bp = NULL;
1612}
1613
1614/*
1615 * See if the UUID is unique among mounted XFS filesystems.
1616 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1617 */
1618STATIC int
1619xfs_uuid_mount(
1620 xfs_mount_t *mp)
1621{
1622 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1623 cmn_err(CE_WARN,
1624 "XFS: Filesystem %s has nil UUID - can't mount",
1625 mp->m_fsname);
1626 return -1;
1627 }
1628 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1629 cmn_err(CE_WARN,
1630 "XFS: Filesystem %s has duplicate UUID - can't mount",
1631 mp->m_fsname);
1632 return -1;
1633 }
1634 return 0;
1635}
1636
1637/*
1638 * Remove filesystem from the UUID table.
1639 */
1640STATIC void
1641xfs_uuid_unmount(
1642 xfs_mount_t *mp)
1643{
1644 uuid_table_remove(&mp->m_sb.sb_uuid);
1645}
1646
1647/*
1648 * Used to log changes to the superblock unit and width fields which could
1649 * be altered by the mount options. Only the first superblock is updated.
1650 */
1651STATIC void
1652xfs_mount_log_sbunit(
1653 xfs_mount_t *mp,
1654 __int64_t fields)
1655{
1656 xfs_trans_t *tp;
1657
1658 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1659
1660 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1661 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1662 XFS_DEFAULT_LOG_COUNT)) {
1663 xfs_trans_cancel(tp, 0);
1664 return;
1665 }
1666 xfs_mod_sb(tp, fields);
1667 xfs_trans_commit(tp, 0, NULL);
1668}
David Chinner8d280b92006-03-14 13:13:09 +11001669
1670
1671#ifdef HAVE_PERCPU_SB
1672/*
1673 * Per-cpu incore superblock counters
1674 *
1675 * Simple concept, difficult implementation
1676 *
1677 * Basically, replace the incore superblock counters with a distributed per cpu
1678 * counter for contended fields (e.g. free block count).
1679 *
1680 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1681 * hence needs to be accurately read when we are running low on space. Hence
1682 * there is a method to enable and disable the per-cpu counters based on how
1683 * much "stuff" is available in them.
1684 *
1685 * Basically, a counter is enabled if there is enough free resource to justify
1686 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1687 * ENOSPC), then we disable the counters to synchronise all callers and
1688 * re-distribute the available resources.
1689 *
1690 * If, once we redistributed the available resources, we still get a failure,
1691 * we disable the per-cpu counter and go through the slow path.
1692 *
1693 * The slow path is the current xfs_mod_incore_sb() function. This means that
1694 * when we disable a per-cpu counter, we need to drain it's resources back to
1695 * the global superblock. We do this after disabling the counter to prevent
1696 * more threads from queueing up on the counter.
1697 *
1698 * Essentially, this means that we still need a lock in the fast path to enable
1699 * synchronisation between the global counters and the per-cpu counters. This
1700 * is not a problem because the lock will be local to a CPU almost all the time
1701 * and have little contention except when we get to ENOSPC conditions.
1702 *
1703 * Basically, this lock becomes a barrier that enables us to lock out the fast
1704 * path while we do things like enabling and disabling counters and
1705 * synchronising the counters.
1706 *
1707 * Locking rules:
1708 *
1709 * 1. XFS_SB_LOCK() before picking up per-cpu locks
1710 * 2. per-cpu locks always picked up via for_each_online_cpu() order
1711 * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks
1712 * 4. modifying per-cpu counters requires holding per-cpu lock
1713 * 5. modifying global counters requires holding XFS_SB_LOCK
1714 * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK
1715 * and _none_ of the per-cpu locks.
1716 *
1717 * Disabled counters are only ever re-enabled by a balance operation
1718 * that results in more free resources per CPU than a given threshold.
1719 * To ensure counters don't remain disabled, they are rebalanced when
1720 * the global resource goes above a higher threshold (i.e. some hysteresis
1721 * is present to prevent thrashing).
David Chinner8d280b92006-03-14 13:13:09 +11001722 */
David Chinnere8234a62006-03-14 13:23:52 +11001723
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001724#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11001725/*
1726 * hot-plug CPU notifier support.
1727 *
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001728 * We need a notifier per filesystem as we need to be able to identify
1729 * the filesystem to balance the counters out. This is achieved by
1730 * having a notifier block embedded in the xfs_mount_t and doing pointer
1731 * magic to get the mount pointer from the notifier block address.
David Chinnere8234a62006-03-14 13:23:52 +11001732 */
1733STATIC int
1734xfs_icsb_cpu_notify(
1735 struct notifier_block *nfb,
1736 unsigned long action,
1737 void *hcpu)
1738{
1739 xfs_icsb_cnts_t *cntp;
1740 xfs_mount_t *mp;
1741 int s;
1742
1743 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
1744 cntp = (xfs_icsb_cnts_t *)
1745 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
1746 switch (action) {
1747 case CPU_UP_PREPARE:
1748 /* Easy Case - initialize the area and locks, and
1749 * then rebalance when online does everything else for us. */
David Chinner01e1b692006-03-14 13:29:16 +11001750 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001751 break;
1752 case CPU_ONLINE:
1753 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
1754 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
1755 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
1756 break;
1757 case CPU_DEAD:
1758 /* Disable all the counters, then fold the dead cpu's
1759 * count into the total on the global superblock and
1760 * re-enable the counters. */
1761 s = XFS_SB_LOCK(mp);
1762 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
1763 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
1764 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
1765
1766 mp->m_sb.sb_icount += cntp->icsb_icount;
1767 mp->m_sb.sb_ifree += cntp->icsb_ifree;
1768 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
1769
David Chinner01e1b692006-03-14 13:29:16 +11001770 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001771
1772 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, XFS_ICSB_SB_LOCKED);
1773 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, XFS_ICSB_SB_LOCKED);
1774 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, XFS_ICSB_SB_LOCKED);
1775 XFS_SB_UNLOCK(mp, s);
1776 break;
1777 }
1778
1779 return NOTIFY_OK;
1780}
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001781#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11001782
David Chinner8d280b92006-03-14 13:13:09 +11001783int
1784xfs_icsb_init_counters(
1785 xfs_mount_t *mp)
1786{
1787 xfs_icsb_cnts_t *cntp;
1788 int i;
1789
1790 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
1791 if (mp->m_sb_cnts == NULL)
1792 return -ENOMEM;
1793
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001794#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11001795 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
1796 mp->m_icsb_notifier.priority = 0;
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001797 register_hotcpu_notifier(&mp->m_icsb_notifier);
1798#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11001799
David Chinner8d280b92006-03-14 13:13:09 +11001800 for_each_online_cpu(i) {
1801 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001802 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinner8d280b92006-03-14 13:13:09 +11001803 }
1804 /*
1805 * start with all counters disabled so that the
1806 * initial balance kicks us off correctly
1807 */
1808 mp->m_icsb_counters = -1;
1809 return 0;
1810}
1811
1812STATIC void
1813xfs_icsb_destroy_counters(
1814 xfs_mount_t *mp)
1815{
David Chinnere8234a62006-03-14 13:23:52 +11001816 if (mp->m_sb_cnts) {
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001817 unregister_hotcpu_notifier(&mp->m_icsb_notifier);
David Chinner8d280b92006-03-14 13:13:09 +11001818 free_percpu(mp->m_sb_cnts);
David Chinnere8234a62006-03-14 13:23:52 +11001819 }
David Chinner8d280b92006-03-14 13:13:09 +11001820}
1821
David Chinner01e1b692006-03-14 13:29:16 +11001822STATIC inline void
1823xfs_icsb_lock_cntr(
1824 xfs_icsb_cnts_t *icsbp)
1825{
1826 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
1827 ndelay(1000);
1828 }
1829}
1830
1831STATIC inline void
1832xfs_icsb_unlock_cntr(
1833 xfs_icsb_cnts_t *icsbp)
1834{
1835 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
1836}
1837
David Chinner8d280b92006-03-14 13:13:09 +11001838
1839STATIC inline void
1840xfs_icsb_lock_all_counters(
1841 xfs_mount_t *mp)
1842{
1843 xfs_icsb_cnts_t *cntp;
1844 int i;
1845
1846 for_each_online_cpu(i) {
1847 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001848 xfs_icsb_lock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11001849 }
1850}
1851
1852STATIC inline void
1853xfs_icsb_unlock_all_counters(
1854 xfs_mount_t *mp)
1855{
1856 xfs_icsb_cnts_t *cntp;
1857 int i;
1858
1859 for_each_online_cpu(i) {
1860 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001861 xfs_icsb_unlock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11001862 }
1863}
1864
1865STATIC void
1866xfs_icsb_count(
1867 xfs_mount_t *mp,
1868 xfs_icsb_cnts_t *cnt,
1869 int flags)
1870{
1871 xfs_icsb_cnts_t *cntp;
1872 int i;
1873
1874 memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
1875
1876 if (!(flags & XFS_ICSB_LAZY_COUNT))
1877 xfs_icsb_lock_all_counters(mp);
1878
1879 for_each_online_cpu(i) {
1880 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1881 cnt->icsb_icount += cntp->icsb_icount;
1882 cnt->icsb_ifree += cntp->icsb_ifree;
1883 cnt->icsb_fdblocks += cntp->icsb_fdblocks;
1884 }
1885
1886 if (!(flags & XFS_ICSB_LAZY_COUNT))
1887 xfs_icsb_unlock_all_counters(mp);
1888}
1889
1890STATIC int
1891xfs_icsb_counter_disabled(
1892 xfs_mount_t *mp,
1893 xfs_sb_field_t field)
1894{
1895 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1896 return test_bit(field, &mp->m_icsb_counters);
1897}
1898
1899STATIC int
1900xfs_icsb_disable_counter(
1901 xfs_mount_t *mp,
1902 xfs_sb_field_t field)
1903{
1904 xfs_icsb_cnts_t cnt;
1905
1906 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1907
1908 xfs_icsb_lock_all_counters(mp);
1909 if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
1910 /* drain back to superblock */
1911
1912 xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT);
1913 switch(field) {
1914 case XFS_SBS_ICOUNT:
1915 mp->m_sb.sb_icount = cnt.icsb_icount;
1916 break;
1917 case XFS_SBS_IFREE:
1918 mp->m_sb.sb_ifree = cnt.icsb_ifree;
1919 break;
1920 case XFS_SBS_FDBLOCKS:
1921 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
1922 break;
1923 default:
1924 BUG();
1925 }
1926 }
1927
1928 xfs_icsb_unlock_all_counters(mp);
1929
1930 return 0;
1931}
1932
1933STATIC void
1934xfs_icsb_enable_counter(
1935 xfs_mount_t *mp,
1936 xfs_sb_field_t field,
1937 uint64_t count,
1938 uint64_t resid)
1939{
1940 xfs_icsb_cnts_t *cntp;
1941 int i;
1942
1943 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1944
1945 xfs_icsb_lock_all_counters(mp);
1946 for_each_online_cpu(i) {
1947 cntp = per_cpu_ptr(mp->m_sb_cnts, i);
1948 switch (field) {
1949 case XFS_SBS_ICOUNT:
1950 cntp->icsb_icount = count + resid;
1951 break;
1952 case XFS_SBS_IFREE:
1953 cntp->icsb_ifree = count + resid;
1954 break;
1955 case XFS_SBS_FDBLOCKS:
1956 cntp->icsb_fdblocks = count + resid;
1957 break;
1958 default:
1959 BUG();
1960 break;
1961 }
1962 resid = 0;
1963 }
1964 clear_bit(field, &mp->m_icsb_counters);
1965 xfs_icsb_unlock_all_counters(mp);
1966}
1967
1968STATIC void
1969xfs_icsb_sync_counters_int(
1970 xfs_mount_t *mp,
1971 int flags)
1972{
1973 xfs_icsb_cnts_t cnt;
1974 int s;
1975
1976 /* Pass 1: lock all counters */
1977 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
1978 s = XFS_SB_LOCK(mp);
1979
1980 xfs_icsb_count(mp, &cnt, flags);
1981
1982 /* Step 3: update mp->m_sb fields */
1983 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
1984 mp->m_sb.sb_icount = cnt.icsb_icount;
1985 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
1986 mp->m_sb.sb_ifree = cnt.icsb_ifree;
1987 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
1988 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
1989
1990 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
1991 XFS_SB_UNLOCK(mp, s);
1992}
1993
1994/*
1995 * Accurate update of per-cpu counters to incore superblock
1996 */
1997STATIC void
1998xfs_icsb_sync_counters(
1999 xfs_mount_t *mp)
2000{
2001 xfs_icsb_sync_counters_int(mp, 0);
2002}
2003
2004/*
2005 * lazy addition used for things like df, background sb syncs, etc
2006 */
2007void
2008xfs_icsb_sync_counters_lazy(
2009 xfs_mount_t *mp)
2010{
2011 xfs_icsb_sync_counters_int(mp, XFS_ICSB_LAZY_COUNT);
2012}
2013
2014/*
2015 * Balance and enable/disable counters as necessary.
2016 *
2017 * Thresholds for re-enabling counters are somewhat magic.
2018 * inode counts are chosen to be the same number as single
2019 * on disk allocation chunk per CPU, and free blocks is
2020 * something far enough zero that we aren't going thrash
2021 * when we get near ENOSPC.
2022 */
2023#define XFS_ICSB_INO_CNTR_REENABLE 64
2024#define XFS_ICSB_FDBLK_CNTR_REENABLE 512
2025STATIC void
2026xfs_icsb_balance_counter(
2027 xfs_mount_t *mp,
2028 xfs_sb_field_t field,
2029 int flags)
2030{
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002031 uint64_t count, resid;
David Chinner8d280b92006-03-14 13:13:09 +11002032 int weight = num_online_cpus();
2033 int s;
2034
2035 if (!(flags & XFS_ICSB_SB_LOCKED))
2036 s = XFS_SB_LOCK(mp);
2037
2038 /* disable counter and sync counter */
2039 xfs_icsb_disable_counter(mp, field);
2040
2041 /* update counters - first CPU gets residual*/
2042 switch (field) {
2043 case XFS_SBS_ICOUNT:
2044 count = mp->m_sb.sb_icount;
2045 resid = do_div(count, weight);
2046 if (count < XFS_ICSB_INO_CNTR_REENABLE)
2047 goto out;
2048 break;
2049 case XFS_SBS_IFREE:
2050 count = mp->m_sb.sb_ifree;
2051 resid = do_div(count, weight);
2052 if (count < XFS_ICSB_INO_CNTR_REENABLE)
2053 goto out;
2054 break;
2055 case XFS_SBS_FDBLOCKS:
2056 count = mp->m_sb.sb_fdblocks;
2057 resid = do_div(count, weight);
2058 if (count < XFS_ICSB_FDBLK_CNTR_REENABLE)
2059 goto out;
2060 break;
2061 default:
2062 BUG();
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002063 count = resid = 0; /* quiet, gcc */
David Chinner8d280b92006-03-14 13:13:09 +11002064 break;
2065 }
2066
2067 xfs_icsb_enable_counter(mp, field, count, resid);
2068out:
2069 if (!(flags & XFS_ICSB_SB_LOCKED))
2070 XFS_SB_UNLOCK(mp, s);
2071}
2072
2073STATIC int
2074xfs_icsb_modify_counters_int(
2075 xfs_mount_t *mp,
2076 xfs_sb_field_t field,
2077 int delta,
2078 int rsvd,
2079 int flags)
2080{
2081 xfs_icsb_cnts_t *icsbp;
2082 long long lcounter; /* long counter for 64 bit fields */
2083 int cpu, s, locked = 0;
2084 int ret = 0, balance_done = 0;
2085
2086again:
2087 cpu = get_cpu();
2088 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu),
David Chinner01e1b692006-03-14 13:29:16 +11002089 xfs_icsb_lock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002090 if (unlikely(xfs_icsb_counter_disabled(mp, field)))
2091 goto slow_path;
2092
2093 switch (field) {
2094 case XFS_SBS_ICOUNT:
2095 lcounter = icsbp->icsb_icount;
2096 lcounter += delta;
2097 if (unlikely(lcounter < 0))
2098 goto slow_path;
2099 icsbp->icsb_icount = lcounter;
2100 break;
2101
2102 case XFS_SBS_IFREE:
2103 lcounter = icsbp->icsb_ifree;
2104 lcounter += delta;
2105 if (unlikely(lcounter < 0))
2106 goto slow_path;
2107 icsbp->icsb_ifree = lcounter;
2108 break;
2109
2110 case XFS_SBS_FDBLOCKS:
2111 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
2112
2113 lcounter = icsbp->icsb_fdblocks;
2114 lcounter += delta;
2115 if (unlikely(lcounter < 0))
2116 goto slow_path;
2117 icsbp->icsb_fdblocks = lcounter;
2118 break;
2119 default:
2120 BUG();
2121 break;
2122 }
David Chinner01e1b692006-03-14 13:29:16 +11002123 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002124 put_cpu();
2125 if (locked)
2126 XFS_SB_UNLOCK(mp, s);
2127 return 0;
2128
2129 /*
2130 * The slow path needs to be run with the SBLOCK
2131 * held so that we prevent other threads from
2132 * attempting to run this path at the same time.
2133 * this provides exclusion for the balancing code,
2134 * and exclusive fallback if the balance does not
2135 * provide enough resources to continue in an unlocked
2136 * manner.
2137 */
2138slow_path:
David Chinner01e1b692006-03-14 13:29:16 +11002139 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002140 put_cpu();
2141
2142 /* need to hold superblock incase we need
2143 * to disable a counter */
2144 if (!(flags & XFS_ICSB_SB_LOCKED)) {
2145 s = XFS_SB_LOCK(mp);
2146 locked = 1;
2147 flags |= XFS_ICSB_SB_LOCKED;
2148 }
2149 if (!balance_done) {
2150 xfs_icsb_balance_counter(mp, field, flags);
2151 balance_done = 1;
2152 goto again;
2153 } else {
2154 /*
2155 * we might not have enough on this local
2156 * cpu to allocate for a bulk request.
2157 * We need to drain this field from all CPUs
2158 * and disable the counter fastpath
2159 */
2160 xfs_icsb_disable_counter(mp, field);
2161 }
2162
2163 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
2164
2165 if (locked)
2166 XFS_SB_UNLOCK(mp, s);
2167 return ret;
2168}
2169
2170STATIC int
2171xfs_icsb_modify_counters(
2172 xfs_mount_t *mp,
2173 xfs_sb_field_t field,
2174 int delta,
2175 int rsvd)
2176{
2177 return xfs_icsb_modify_counters_int(mp, field, delta, rsvd, 0);
2178}
2179
2180/*
2181 * Called when superblock is already locked
2182 */
2183STATIC int
2184xfs_icsb_modify_counters_locked(
2185 xfs_mount_t *mp,
2186 xfs_sb_field_t field,
2187 int delta,
2188 int rsvd)
2189{
2190 return xfs_icsb_modify_counters_int(mp, field, delta,
2191 rsvd, XFS_ICSB_SB_LOCKED);
2192}
2193#endif