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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"
Christoph Hellwig43355092008-03-27 18:01:08 +110046#include "xfs_utils.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
David Chinnere5720ee2008-04-10 12:21:18 +100048STATIC int xfs_mount_log_sb(xfs_mount_t *, __int64_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049STATIC int xfs_uuid_mount(xfs_mount_t *);
50STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100051STATIC void xfs_unmountfs_wait(xfs_mount_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
David Chinner8d280b92006-03-14 13:13:09 +110053
54#ifdef HAVE_PERCPU_SB
55STATIC void xfs_icsb_destroy_counters(xfs_mount_t *);
David Chinner20f4ebf2007-02-10 18:36:10 +110056STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t,
Christoph Hellwig45af6c62008-04-22 17:34:44 +100057 int);
58STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t,
59 int);
David Chinner8d280b92006-03-14 13:13:09 +110060STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
David Chinner20f4ebf2007-02-10 18:36:10 +110061 int64_t, int);
David Chinner36fbe6e2008-04-10 12:19:56 +100062STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
David Chinner8d280b92006-03-14 13:13:09 +110063
64#else
65
66#define xfs_icsb_destroy_counters(mp) do { } while (0)
Christoph Hellwig45af6c62008-04-22 17:34:44 +100067#define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
68#define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0)
David Chinner8d280b92006-03-14 13:13:09 +110069#define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
David Chinner8d280b92006-03-14 13:13:09 +110070
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 },
David Chinneree1c0902008-03-06 13:45:50 +1100124 { offsetof(xfs_sb_t, sb_bad_features2), 0 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 { sizeof(xfs_sb_t), 0 }
126};
127
128/*
129 * Return a pointer to an initialized xfs_mount structure.
130 */
131xfs_mount_t *
132xfs_mount_init(void)
133{
134 xfs_mount_t *mp;
135
David Chinner8d280b92006-03-14 13:13:09 +1100136 mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP);
137
138 if (xfs_icsb_init_counters(mp)) {
139 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Eric Sandeen007c61c2007-10-11 17:43:56 +1000142 spin_lock_init(&mp->m_sb_lock);
Jes Sorensen794ee1b2006-01-09 15:59:21 -0800143 mutex_init(&mp->m_ilock);
Christoph Hellwigcc92e7a2007-08-30 17:21:54 +1000144 mutex_init(&mp->m_growlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 atomic_set(&mp->m_active_trans, 0);
146
147 return mp;
148}
149
150/*
151 * Free up the resources associated with a mount structure. Assume that
152 * the structure was initially zeroed, so we can tell which fields got
153 * initialized.
154 */
155void
156xfs_mount_free(
Christoph Hellwig745f6912007-08-30 17:20:39 +1000157 xfs_mount_t *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (mp->m_perag) {
160 int agno;
161
162 for (agno = 0; agno < mp->m_maxagi; agno++)
163 if (mp->m_perag[agno].pagb_list)
164 kmem_free(mp->m_perag[agno].pagb_list,
165 sizeof(xfs_perag_busy_t) *
166 XFS_PAGB_NUM_SLOTS);
167 kmem_free(mp->m_perag,
168 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
169 }
170
Donald Douwsma287f3da2007-10-11 17:36:05 +1000171 spinlock_destroy(&mp->m_ail_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 spinlock_destroy(&mp->m_sb_lock);
173 mutex_destroy(&mp->m_ilock);
Christoph Hellwigcc92e7a2007-08-30 17:21:54 +1000174 mutex_destroy(&mp->m_growlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (mp->m_quotainfo)
176 XFS_QM_DONE(mp);
177
178 if (mp->m_fsname != NULL)
179 kmem_free(mp->m_fsname, mp->m_fsname_len);
Nathan Scottfc1f8c12005-11-02 11:44:33 +1100180 if (mp->m_rtname != NULL)
181 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
182 if (mp->m_logname != NULL)
183 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
David Chinner8d280b92006-03-14 13:13:09 +1100185 xfs_icsb_destroy_counters(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Nathan Scott4cc929e2007-05-14 18:24:02 +1000188/*
189 * Check size of device based on the (data/realtime) block count.
190 * Note: this check is used by the growfs code as well as mount.
191 */
192int
193xfs_sb_validate_fsb_count(
194 xfs_sb_t *sbp,
195 __uint64_t nblocks)
196{
197 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
198 ASSERT(sbp->sb_blocklog >= BBSHIFT);
199
200#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
201 if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
202 return E2BIG;
203#else /* Limited by UINT_MAX of sectors */
204 if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX)
205 return E2BIG;
206#endif
207 return 0;
208}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210/*
211 * Check the validity of the SB found.
212 */
213STATIC int
214xfs_mount_validate_sb(
215 xfs_mount_t *mp,
Nathan Scott764d1f82006-03-31 13:04:17 +1000216 xfs_sb_t *sbp,
217 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
219 /*
220 * If the log device and data device have the
221 * same device number, the log is internal.
222 * Consequently, the sb_logstart should be non-zero. If
223 * we have a zero sb_logstart in this case, we may be trying to mount
224 * a volume filesystem in a non-volume manner.
225 */
226 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000227 xfs_fs_mount_cmn_err(flags, "bad magic number");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return XFS_ERROR(EWRONGFS);
229 }
230
Eric Sandeen62118702008-03-06 13:44:28 +1100231 if (!xfs_sb_good_version(sbp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000232 xfs_fs_mount_cmn_err(flags, "bad version");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return XFS_ERROR(EWRONGFS);
234 }
235
236 if (unlikely(
237 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000238 xfs_fs_mount_cmn_err(flags,
239 "filesystem is marked as having an external log; "
240 "specify logdev on the\nmount command line.");
241 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243
244 if (unlikely(
245 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000246 xfs_fs_mount_cmn_err(flags,
247 "filesystem is marked as having an internal log; "
248 "do not specify logdev on\nthe mount command line.");
249 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
251
252 /*
253 * More sanity checking. These were stolen directly from
254 * xfs_repair.
255 */
256 if (unlikely(
257 sbp->sb_agcount <= 0 ||
258 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
259 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
260 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
261 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
262 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
263 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
264 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
265 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
266 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
267 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
Nathan Scott9f989c92006-03-14 13:29:32 +1100268 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
269 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
270 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
272 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
Nathan Scotte50bd162006-04-11 15:10:45 +1000273 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000274 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return XFS_ERROR(EFSCORRUPTED);
276 }
277
278 /*
279 * Sanity check AG count, size fields against data size field
280 */
281 if (unlikely(
282 sbp->sb_dblocks == 0 ||
283 sbp->sb_dblocks >
284 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
285 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
286 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000287 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return XFS_ERROR(EFSCORRUPTED);
289 }
290
Nathan Scott4cc929e2007-05-14 18:24:02 +1000291 if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
292 xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000293 xfs_fs_mount_cmn_err(flags,
294 "file system too large to be mounted on this system.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 return XFS_ERROR(E2BIG);
296 }
297
298 if (unlikely(sbp->sb_inprogress)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000299 xfs_fs_mount_cmn_err(flags, "file system busy");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return XFS_ERROR(EFSCORRUPTED);
301 }
302
303 /*
Nathan Scottde206142005-05-05 13:24:13 -0700304 * Version 1 directory format has never worked on Linux.
305 */
Eric Sandeen62118702008-03-06 13:44:28 +1100306 if (unlikely(!xfs_sb_version_hasdirv2(sbp))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000307 xfs_fs_mount_cmn_err(flags,
308 "file system using version 1 directory format");
Nathan Scottde206142005-05-05 13:24:13 -0700309 return XFS_ERROR(ENOSYS);
310 }
311
312 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * Until this is fixed only page-sized or smaller data blocks work.
314 */
315 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000316 xfs_fs_mount_cmn_err(flags,
317 "file system with blocksize %d bytes",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 sbp->sb_blocksize);
Nathan Scott764d1f82006-03-31 13:04:17 +1000319 xfs_fs_mount_cmn_err(flags,
320 "only pagesize (%ld) or less will currently work.",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 PAGE_SIZE);
322 return XFS_ERROR(ENOSYS);
323 }
324
325 return 0;
326}
327
David Chinnerda353b02007-08-28 14:00:13 +1000328STATIC void
329xfs_initialize_perag_icache(
330 xfs_perag_t *pag)
331{
332 if (!pag->pag_ici_init) {
333 rwlock_init(&pag->pag_ici_lock);
334 INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
335 pag->pag_ici_init = 1;
336 }
337}
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339xfs_agnumber_t
Nathan Scottc11e2c32005-11-02 15:11:45 +1100340xfs_initialize_perag(
Nathan Scottc11e2c32005-11-02 15:11:45 +1100341 xfs_mount_t *mp,
342 xfs_agnumber_t agcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 xfs_agnumber_t index, max_metadata;
345 xfs_perag_t *pag;
346 xfs_agino_t agino;
347 xfs_ino_t ino;
348 xfs_sb_t *sbp = &mp->m_sb;
349 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
350
351 /* Check to see if the filesystem can overflow 32 bit inodes */
352 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
353 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
354
355 /* Clear the mount flag if no inode can overflow 32 bits
356 * on this filesystem, or if specifically requested..
357 */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000358 if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > max_inum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 mp->m_flags |= XFS_MOUNT_32BITINODES;
360 } else {
361 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
362 }
363
364 /* If we can overflow then setup the ag headers accordingly */
365 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
366 /* Calculate how much should be reserved for inodes to
367 * meet the max inode percentage.
368 */
369 if (mp->m_maxicount) {
370 __uint64_t icount;
371
372 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
373 do_div(icount, 100);
374 icount += sbp->sb_agblocks - 1;
Eric Sandeena749ee82005-11-02 15:13:42 +1100375 do_div(icount, sbp->sb_agblocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 max_metadata = icount;
377 } else {
378 max_metadata = agcount;
379 }
380 for (index = 0; index < agcount; index++) {
381 ino = XFS_AGINO_TO_INO(mp, index, agino);
382 if (ino > max_inum) {
383 index++;
384 break;
385 }
386
Nathan Scottc41564b2006-03-29 08:55:14 +1000387 /* This ag is preferred for inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 pag = &mp->m_perag[index];
389 pag->pagi_inodeok = 1;
390 if (index < max_metadata)
391 pag->pagf_metadata = 1;
David Chinnerda353b02007-08-28 14:00:13 +1000392 xfs_initialize_perag_icache(pag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 }
394 } else {
395 /* Setup default behavior for smaller filesystems */
396 for (index = 0; index < agcount; index++) {
397 pag = &mp->m_perag[index];
398 pag->pagi_inodeok = 1;
David Chinnerda353b02007-08-28 14:00:13 +1000399 xfs_initialize_perag_icache(pag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401 }
402 return index;
403}
404
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000405void
406xfs_sb_from_disk(
407 xfs_sb_t *to,
408 xfs_dsb_t *from)
409{
410 to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
411 to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
412 to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
413 to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
414 to->sb_rextents = be64_to_cpu(from->sb_rextents);
415 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
416 to->sb_logstart = be64_to_cpu(from->sb_logstart);
417 to->sb_rootino = be64_to_cpu(from->sb_rootino);
418 to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
419 to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
420 to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
421 to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
422 to->sb_agcount = be32_to_cpu(from->sb_agcount);
423 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
424 to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
425 to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
426 to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
427 to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
428 to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
429 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
430 to->sb_blocklog = from->sb_blocklog;
431 to->sb_sectlog = from->sb_sectlog;
432 to->sb_inodelog = from->sb_inodelog;
433 to->sb_inopblog = from->sb_inopblog;
434 to->sb_agblklog = from->sb_agblklog;
435 to->sb_rextslog = from->sb_rextslog;
436 to->sb_inprogress = from->sb_inprogress;
437 to->sb_imax_pct = from->sb_imax_pct;
438 to->sb_icount = be64_to_cpu(from->sb_icount);
439 to->sb_ifree = be64_to_cpu(from->sb_ifree);
440 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
441 to->sb_frextents = be64_to_cpu(from->sb_frextents);
442 to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
443 to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
444 to->sb_qflags = be16_to_cpu(from->sb_qflags);
445 to->sb_flags = from->sb_flags;
446 to->sb_shared_vn = from->sb_shared_vn;
447 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
448 to->sb_unit = be32_to_cpu(from->sb_unit);
449 to->sb_width = be32_to_cpu(from->sb_width);
450 to->sb_dirblklog = from->sb_dirblklog;
451 to->sb_logsectlog = from->sb_logsectlog;
452 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
453 to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
454 to->sb_features2 = be32_to_cpu(from->sb_features2);
David Chinneree1c0902008-03-06 13:45:50 +1100455 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000456}
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458/*
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000459 * Copy in core superblock to ondisk one.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 *
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000461 * The fields argument is mask of superblock fields to copy.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 */
463void
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000464xfs_sb_to_disk(
465 xfs_dsb_t *to,
466 xfs_sb_t *from,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 __int64_t fields)
468{
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000469 xfs_caddr_t to_ptr = (xfs_caddr_t)to;
470 xfs_caddr_t from_ptr = (xfs_caddr_t)from;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 xfs_sb_field_t f;
472 int first;
473 int size;
474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 ASSERT(fields);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if (!fields)
477 return;
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 while (fields) {
480 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
481 first = xfs_sb_info[f].offset;
482 size = xfs_sb_info[f + 1].offset - first;
483
484 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
485
486 if (size == 1 || xfs_sb_info[f].type == 1) {
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000487 memcpy(to_ptr + first, from_ptr + first, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 } else {
489 switch (size) {
490 case 2:
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000491 *(__be16 *)(to_ptr + first) =
492 cpu_to_be16(*(__u16 *)(from_ptr + first));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 break;
494 case 4:
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000495 *(__be32 *)(to_ptr + first) =
496 cpu_to_be32(*(__u32 *)(from_ptr + first));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 break;
498 case 8:
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000499 *(__be64 *)(to_ptr + first) =
500 cpu_to_be64(*(__u64 *)(from_ptr + first));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 break;
502 default:
503 ASSERT(0);
504 }
505 }
506
507 fields &= ~(1LL << f);
508 }
509}
510
511/*
512 * xfs_readsb
513 *
514 * Does the initial read of the superblock.
515 */
516int
Nathan Scott764d1f82006-03-31 13:04:17 +1000517xfs_readsb(xfs_mount_t *mp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
519 unsigned int sector_size;
520 unsigned int extra_flags;
521 xfs_buf_t *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 int error;
523
524 ASSERT(mp->m_sb_bp == NULL);
525 ASSERT(mp->m_ddev_targp != NULL);
526
527 /*
528 * Allocate a (locked) buffer to hold the superblock.
529 * This will be kept around at all times to optimize
530 * access to the superblock.
531 */
532 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
533 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
534
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 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 /*
546 * Initialize the mount structure from the superblock.
547 * But first do some basic consistency checking.
548 */
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000549 xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Nathan Scott764d1f82006-03-31 13:04:17 +1000551 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 if (error) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000553 xfs_fs_mount_cmn_err(flags, "SB validate failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 goto fail;
555 }
556
557 /*
558 * We must be able to do sector-sized and sector-aligned IO.
559 */
560 if (sector_size > mp->m_sb.sb_sectsize) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000561 xfs_fs_mount_cmn_err(flags,
562 "device supports only %u byte sectors (not %u)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 sector_size, mp->m_sb.sb_sectsize);
564 error = ENOSYS;
565 goto fail;
566 }
567
568 /*
569 * If device sector size is smaller than the superblock size,
570 * re-read the superblock so the buffer is correctly sized.
571 */
572 if (sector_size < mp->m_sb.sb_sectsize) {
573 XFS_BUF_UNMANAGE(bp);
574 xfs_buf_relse(bp);
575 sector_size = mp->m_sb.sb_sectsize;
576 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
577 BTOBB(sector_size), extra_flags);
578 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000579 xfs_fs_mount_cmn_err(flags, "SB re-read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
581 goto fail;
582 }
583 ASSERT(XFS_BUF_ISBUSY(bp));
584 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
585 }
586
Lachlan McIlroy5478eea2007-02-10 18:36:29 +1100587 /* Initialize per-cpu counters */
588 xfs_icsb_reinit_counters(mp);
David Chinner8d280b92006-03-14 13:13:09 +1100589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 mp->m_sb_bp = bp;
591 xfs_buf_relse(bp);
592 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
593 return 0;
594
595 fail:
596 if (bp) {
597 XFS_BUF_UNMANAGE(bp);
598 xfs_buf_relse(bp);
599 }
600 return error;
601}
602
603
604/*
605 * xfs_mount_common
606 *
607 * Mount initialization code establishing various mount
608 * fields from the superblock associated with the given
609 * mount structure
610 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000611STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
613{
614 int i;
615
616 mp->m_agfrotor = mp->m_agirotor = 0;
Eric Sandeen007c61c2007-10-11 17:43:56 +1000617 spin_lock_init(&mp->m_agirotor_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 mp->m_maxagi = mp->m_sb.sb_agcount;
619 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
620 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
621 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
622 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
623 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
624 mp->m_litino = sbp->sb_inodesize -
625 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
626 mp->m_blockmask = sbp->sb_blocksize - 1;
627 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
628 mp->m_blockwmask = mp->m_blockwsize - 1;
629 INIT_LIST_HEAD(&mp->m_del_inodes);
630
631 /*
632 * Setup for attributes, in case they get created.
633 * This value is for inodes getting attributes for the first time,
634 * the per-inode value is for old attribute values.
635 */
636 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
637 switch (sbp->sb_inodesize) {
638 case 256:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100639 mp->m_attroffset = XFS_LITINO(mp) -
640 XFS_BMDR_SPACE_CALC(MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 break;
642 case 512:
643 case 1024:
644 case 2048:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100645 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 break;
647 default:
648 ASSERT(0);
649 }
650 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
651
652 for (i = 0; i < 2; i++) {
653 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
654 xfs_alloc, i == 0);
655 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
656 xfs_alloc, i == 0);
657 }
658 for (i = 0; i < 2; i++) {
659 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
660 xfs_bmbt, i == 0);
661 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
662 xfs_bmbt, i == 0);
663 }
664 for (i = 0; i < 2; i++) {
665 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
666 xfs_inobt, i == 0);
667 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
668 xfs_inobt, i == 0);
669 }
670
671 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
672 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
673 sbp->sb_inopblock);
674 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
675}
David Chinner92821e22007-05-24 15:26:31 +1000676
677/*
678 * xfs_initialize_perag_data
679 *
680 * Read in each per-ag structure so we can count up the number of
681 * allocated inodes, free inodes and used filesystem blocks as this
682 * information is no longer persistent in the superblock. Once we have
683 * this information, write it into the in-core superblock structure.
684 */
685STATIC int
686xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount)
687{
688 xfs_agnumber_t index;
689 xfs_perag_t *pag;
690 xfs_sb_t *sbp = &mp->m_sb;
691 uint64_t ifree = 0;
692 uint64_t ialloc = 0;
693 uint64_t bfree = 0;
694 uint64_t bfreelst = 0;
695 uint64_t btree = 0;
696 int error;
David Chinner92821e22007-05-24 15:26:31 +1000697
698 for (index = 0; index < agcount; index++) {
699 /*
700 * read the agf, then the agi. This gets us
701 * all the inforamtion we need and populates the
702 * per-ag structures for us.
703 */
704 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
705 if (error)
706 return error;
707
708 error = xfs_ialloc_pagi_init(mp, NULL, index);
709 if (error)
710 return error;
711 pag = &mp->m_perag[index];
712 ifree += pag->pagi_freecount;
713 ialloc += pag->pagi_count;
714 bfree += pag->pagf_freeblks;
715 bfreelst += pag->pagf_flcount;
716 btree += pag->pagf_btreeblks;
717 }
718 /*
719 * Overwrite incore superblock counters with just-read data
720 */
Eric Sandeen3685c2a2007-10-11 17:42:32 +1000721 spin_lock(&mp->m_sb_lock);
David Chinner92821e22007-05-24 15:26:31 +1000722 sbp->sb_ifree = ifree;
723 sbp->sb_icount = ialloc;
724 sbp->sb_fdblocks = bfree + bfreelst + btree;
Eric Sandeen3685c2a2007-10-11 17:42:32 +1000725 spin_unlock(&mp->m_sb_lock);
David Chinner92821e22007-05-24 15:26:31 +1000726
727 /* Fixup the per-cpu counters as well. */
728 xfs_icsb_reinit_counters(mp);
729
730 return 0;
731}
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733/*
Eric Sandeen0771fb42007-10-12 11:03:40 +1000734 * Update alignment values based on mount options and sb values
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 */
Eric Sandeen0771fb42007-10-12 11:03:40 +1000736STATIC int
737xfs_update_alignment(xfs_mount_t *mp, int mfsi_flags, __uint64_t *update_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 xfs_sb_t *sbp = &(mp->m_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
742 /*
743 * If stripe unit and stripe width are not multiples
744 * of the fs blocksize turn off alignment.
745 */
746 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
747 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
748 if (mp->m_flags & XFS_MOUNT_RETERR) {
749 cmn_err(CE_WARN,
750 "XFS: alignment check 1 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000751 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
753 mp->m_dalign = mp->m_swidth = 0;
754 } else {
755 /*
756 * Convert the stripe unit and width to FSBs.
757 */
758 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
759 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
760 if (mp->m_flags & XFS_MOUNT_RETERR) {
Eric Sandeen0771fb42007-10-12 11:03:40 +1000761 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 }
763 xfs_fs_cmn_err(CE_WARN, mp,
764"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
765 mp->m_dalign, mp->m_swidth,
766 sbp->sb_agblocks);
767
768 mp->m_dalign = 0;
769 mp->m_swidth = 0;
770 } else if (mp->m_dalign) {
771 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
772 } else {
773 if (mp->m_flags & XFS_MOUNT_RETERR) {
774 xfs_fs_cmn_err(CE_WARN, mp,
775"stripe alignment turned off: sunit(%d) less than bsize(%d)",
776 mp->m_dalign,
777 mp->m_blockmask +1);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000778 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
780 mp->m_swidth = 0;
781 }
782 }
783
784 /*
785 * Update superblock with new values
786 * and log changes
787 */
Eric Sandeen62118702008-03-06 13:44:28 +1100788 if (xfs_sb_version_hasdalign(sbp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (sbp->sb_unit != mp->m_dalign) {
790 sbp->sb_unit = mp->m_dalign;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000791 *update_flags |= XFS_SB_UNIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 }
793 if (sbp->sb_width != mp->m_swidth) {
794 sbp->sb_width = mp->m_swidth;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000795 *update_flags |= XFS_SB_WIDTH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 }
797 }
798 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
Eric Sandeen62118702008-03-06 13:44:28 +1100799 xfs_sb_version_hasdalign(&mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 mp->m_dalign = sbp->sb_unit;
801 mp->m_swidth = sbp->sb_width;
802 }
803
Eric Sandeen0771fb42007-10-12 11:03:40 +1000804 return 0;
805}
806
807/*
808 * Set the maximum inode count for this filesystem
809 */
810STATIC void
811xfs_set_maxicount(xfs_mount_t *mp)
812{
813 xfs_sb_t *sbp = &(mp->m_sb);
814 __uint64_t icount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
816 if (sbp->sb_imax_pct) {
Eric Sandeen0771fb42007-10-12 11:03:40 +1000817 /*
818 * Make sure the maximum inode count is a multiple
819 * of the units we allocate inodes in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
822 do_div(icount, 100);
823 do_div(icount, mp->m_ialloc_blks);
824 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
825 sbp->sb_inopblog;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000826 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 mp->m_maxicount = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
Eric Sandeen0771fb42007-10-12 11:03:40 +1000829}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Eric Sandeen0771fb42007-10-12 11:03:40 +1000831/*
832 * Set the default minimum read and write sizes unless
833 * already specified in a mount option.
834 * We use smaller I/O sizes when the file system
835 * is being used for NFS service (wsync mount option).
836 */
837STATIC void
838xfs_set_rw_sizes(xfs_mount_t *mp)
839{
840 xfs_sb_t *sbp = &(mp->m_sb);
841 int readio_log, writeio_log;
842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
844 if (mp->m_flags & XFS_MOUNT_WSYNC) {
845 readio_log = XFS_WSYNC_READIO_LOG;
846 writeio_log = XFS_WSYNC_WRITEIO_LOG;
847 } else {
848 readio_log = XFS_READIO_LOG_LARGE;
849 writeio_log = XFS_WRITEIO_LOG_LARGE;
850 }
851 } else {
852 readio_log = mp->m_readio_log;
853 writeio_log = mp->m_writeio_log;
854 }
855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 if (sbp->sb_blocklog > readio_log) {
857 mp->m_readio_log = sbp->sb_blocklog;
858 } else {
859 mp->m_readio_log = readio_log;
860 }
861 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
862 if (sbp->sb_blocklog > writeio_log) {
863 mp->m_writeio_log = sbp->sb_blocklog;
864 } else {
865 mp->m_writeio_log = writeio_log;
866 }
867 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000868}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Eric Sandeen0771fb42007-10-12 11:03:40 +1000870/*
871 * Set whether we're using inode alignment.
872 */
873STATIC void
874xfs_set_inoalignment(xfs_mount_t *mp)
875{
Eric Sandeen62118702008-03-06 13:44:28 +1100876 if (xfs_sb_version_hasalign(&mp->m_sb) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 mp->m_sb.sb_inoalignmt >=
878 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
879 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
880 else
881 mp->m_inoalign_mask = 0;
882 /*
883 * If we are using stripe alignment, check whether
884 * the stripe unit is a multiple of the inode alignment
885 */
886 if (mp->m_dalign && mp->m_inoalign_mask &&
887 !(mp->m_dalign & mp->m_inoalign_mask))
888 mp->m_sinoalign = mp->m_dalign;
889 else
890 mp->m_sinoalign = 0;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000891}
892
893/*
894 * Check that the data (and log if separate) are an ok size.
895 */
896STATIC int
897xfs_check_sizes(xfs_mount_t *mp, int mfsi_flags)
898{
899 xfs_buf_t *bp;
900 xfs_daddr_t d;
901 int error;
902
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
904 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
905 cmn_err(CE_WARN, "XFS: size check 1 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000906 return XFS_ERROR(E2BIG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 }
908 error = xfs_read_buf(mp, mp->m_ddev_targp,
909 d - XFS_FSS_TO_BB(mp, 1),
910 XFS_FSS_TO_BB(mp, 1), 0, &bp);
911 if (!error) {
912 xfs_buf_relse(bp);
913 } else {
914 cmn_err(CE_WARN, "XFS: size check 2 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000915 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 error = XFS_ERROR(E2BIG);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000917 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 }
919
920 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
921 mp->m_logdev_targp != mp->m_ddev_targp) {
922 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
923 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
924 cmn_err(CE_WARN, "XFS: size check 3 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000925 return XFS_ERROR(E2BIG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 }
927 error = xfs_read_buf(mp, mp->m_logdev_targp,
928 d - XFS_FSB_TO_BB(mp, 1),
929 XFS_FSB_TO_BB(mp, 1), 0, &bp);
930 if (!error) {
931 xfs_buf_relse(bp);
932 } else {
933 cmn_err(CE_WARN, "XFS: size check 3 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000934 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 error = XFS_ERROR(E2BIG);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000936 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 }
938 }
Eric Sandeen0771fb42007-10-12 11:03:40 +1000939 return 0;
940}
941
942/*
943 * xfs_mountfs
944 *
945 * This function does the following on an initial mount of a file system:
946 * - reads the superblock from disk and init the mount struct
947 * - if we're a 32-bit kernel, do a size check on the superblock
948 * so we don't mount terabyte filesystems
949 * - init mount struct realtime fields
950 * - allocate inode hash table for fs
951 * - init directory manager
952 * - perform recovery and init the log manager
953 */
954int
955xfs_mountfs(
956 xfs_mount_t *mp,
957 int mfsi_flags)
958{
959 xfs_sb_t *sbp = &(mp->m_sb);
960 xfs_inode_t *rip;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000961 __uint64_t resblks;
962 __int64_t update_flags = 0LL;
963 uint quotamount, quotaflags;
964 int agno;
965 int uuid_mounted = 0;
966 int error = 0;
967
Eric Sandeen0771fb42007-10-12 11:03:40 +1000968 xfs_mount_common(mp, sbp);
969
970 /*
Eric Sandeene6957ea2008-04-10 12:19:34 +1000971 * Check for a mismatched features2 values. Older kernels
972 * read & wrote into the wrong sb offset for sb_features2
973 * on some platforms due to xfs_sb_t not being 64bit size aligned
974 * when sb_features2 was added, which made older superblock
975 * reading/writing routines swap it as a 64-bit value.
David Chinneree1c0902008-03-06 13:45:50 +1100976 *
Eric Sandeene6957ea2008-04-10 12:19:34 +1000977 * For backwards compatibility, we make both slots equal.
978 *
979 * If we detect a mismatched field, we OR the set bits into the
980 * existing features2 field in case it has already been modified; we
981 * don't want to lose any features. We then update the bad location
982 * with the ORed value so that older kernels will see any features2
983 * flags, and mark the two fields as needing updates once the
984 * transaction subsystem is online.
David Chinneree1c0902008-03-06 13:45:50 +1100985 */
Eric Sandeene6957ea2008-04-10 12:19:34 +1000986 if (xfs_sb_has_mismatched_features2(sbp)) {
David Chinneree1c0902008-03-06 13:45:50 +1100987 cmn_err(CE_WARN,
988 "XFS: correcting sb_features alignment problem");
989 sbp->sb_features2 |= sbp->sb_bad_features2;
Eric Sandeene6957ea2008-04-10 12:19:34 +1000990 sbp->sb_bad_features2 = sbp->sb_features2;
David Chinneree1c0902008-03-06 13:45:50 +1100991 update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2;
Eric Sandeene6957ea2008-04-10 12:19:34 +1000992
993 /*
994 * Re-check for ATTR2 in case it was found in bad_features2
995 * slot.
996 */
Tim Shimmin7c12f292008-04-30 18:15:28 +1000997 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
998 !(mp->m_flags & XFS_MOUNT_NOATTR2))
Eric Sandeene6957ea2008-04-10 12:19:34 +1000999 mp->m_flags |= XFS_MOUNT_ATTR2;
Tim Shimmin7c12f292008-04-30 18:15:28 +10001000 }
Eric Sandeene6957ea2008-04-10 12:19:34 +10001001
Tim Shimmin7c12f292008-04-30 18:15:28 +10001002 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1003 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1004 xfs_sb_version_removeattr2(&mp->m_sb);
1005 update_flags |= XFS_SB_FEATURES2;
1006
1007 /* update sb_versionnum for the clearing of the morebits */
1008 if (!sbp->sb_features2)
1009 update_flags |= XFS_SB_VERSIONNUM;
David Chinneree1c0902008-03-06 13:45:50 +11001010 }
1011
1012 /*
Eric Sandeen0771fb42007-10-12 11:03:40 +10001013 * Check if sb_agblocks is aligned at stripe boundary
1014 * If sb_agblocks is NOT aligned turn off m_dalign since
1015 * allocator alignment is within an ag, therefore ag has
1016 * to be aligned at stripe boundary.
1017 */
1018 error = xfs_update_alignment(mp, mfsi_flags, &update_flags);
1019 if (error)
1020 goto error1;
1021
1022 xfs_alloc_compute_maxlevels(mp);
1023 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
1024 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
1025 xfs_ialloc_compute_maxlevels(mp);
1026
1027 xfs_set_maxicount(mp);
1028
1029 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
1030
1031 /*
1032 * XFS uses the uuid from the superblock as the unique
1033 * identifier for fsid. We can not use the uuid from the volume
1034 * since a single partition filesystem is identical to a single
1035 * partition volume/filesystem.
1036 */
1037 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
1038 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
1039 if (xfs_uuid_mount(mp)) {
1040 error = XFS_ERROR(EINVAL);
1041 goto error1;
1042 }
1043 uuid_mounted=1;
1044 }
1045
1046 /*
1047 * Set the minimum read and write sizes
1048 */
1049 xfs_set_rw_sizes(mp);
1050
1051 /*
1052 * Set the inode cluster size.
1053 * This may still be overridden by the file system
1054 * block size if it is larger than the chosen cluster size.
1055 */
1056 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
1057
1058 /*
1059 * Set inode alignment fields
1060 */
1061 xfs_set_inoalignment(mp);
1062
1063 /*
1064 * Check that the data (and log if separate) are an ok size.
1065 */
1066 error = xfs_check_sizes(mp, mfsi_flags);
1067 if (error)
1068 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
1070 /*
1071 * Initialize realtime fields in the mount structure
1072 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001073 error = xfs_rtmount_init(mp);
1074 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 cmn_err(CE_WARN, "XFS: RT mount failed");
1076 goto error1;
1077 }
1078
1079 /*
1080 * For client case we are done now
1081 */
1082 if (mfsi_flags & XFS_MFSI_CLIENT) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001083 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 }
1085
1086 /*
1087 * Copies the low order bits of the timestamp and the randomly
1088 * set "sequence" number out of a UUID.
1089 */
1090 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
1091
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 mp->m_dmevmask = 0; /* not persistent; set after each mount */
1093
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10001094 xfs_dir_mount(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096 /*
1097 * Initialize the attribute manager's entries.
1098 */
1099 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
1100
1101 /*
1102 * Initialize the precomputed transaction reservations values.
1103 */
1104 xfs_trans_init(mp);
1105
1106 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 * Allocate and initialize the per-ag data.
1108 */
1109 init_rwsem(&mp->m_peraglock);
1110 mp->m_perag =
1111 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
1112
Christoph Hellwigb267ce92007-08-30 17:21:30 +10001113 mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115 /*
1116 * log's mount-time initialization. Perform 1st part recovery if needed
1117 */
1118 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
1119 error = xfs_log_mount(mp, mp->m_logdev_targp,
1120 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
1121 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
1122 if (error) {
1123 cmn_err(CE_WARN, "XFS: log mount failed");
1124 goto error2;
1125 }
1126 } else { /* No log has been defined */
1127 cmn_err(CE_WARN, "XFS: no log defined");
1128 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
1129 error = XFS_ERROR(EFSCORRUPTED);
1130 goto error2;
1131 }
1132
1133 /*
David Chinner92821e22007-05-24 15:26:31 +10001134 * Now the log is mounted, we know if it was an unclean shutdown or
1135 * not. If it was, with the first phase of recovery has completed, we
1136 * have consistent AG blocks on disk. We have not recovered EFIs yet,
1137 * but they are recovered transactionally in the second recovery phase
1138 * later.
1139 *
1140 * Hence we can safely re-initialise incore superblock counters from
1141 * the per-ag data. These may not be correct if the filesystem was not
1142 * cleanly unmounted, so we need to wait for recovery to finish before
1143 * doing this.
1144 *
1145 * If the filesystem was cleanly unmounted, then we can trust the
1146 * values in the superblock to be correct and we don't need to do
1147 * anything here.
1148 *
1149 * If we are currently making the filesystem, the initialisation will
1150 * fail as the perag data is in an undefined state.
1151 */
1152
1153 if (xfs_sb_version_haslazysbcount(&mp->m_sb) &&
1154 !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) &&
1155 !mp->m_sb.sb_inprogress) {
1156 error = xfs_initialize_perag_data(mp, sbp->sb_agcount);
1157 if (error) {
1158 goto error2;
1159 }
1160 }
1161 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 * Get and sanity-check the root inode.
1163 * Save the pointer to it in the mount structure.
1164 */
1165 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
1166 if (error) {
1167 cmn_err(CE_WARN, "XFS: failed to read root inode");
1168 goto error3;
1169 }
1170
1171 ASSERT(rip != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
1174 cmn_err(CE_WARN, "XFS: corrupted root inode");
Nathan Scottb6574522006-06-09 15:29:40 +10001175 cmn_err(CE_WARN, "Device %s - root %llu is not a directory",
1176 XFS_BUFTARG_NAME(mp->m_ddev_targp),
1177 (unsigned long long)rip->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1179 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
1180 mp);
1181 error = XFS_ERROR(EFSCORRUPTED);
1182 goto error4;
1183 }
1184 mp->m_rootip = rip; /* save it */
1185
1186 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1187
1188 /*
1189 * Initialize realtime inode pointers in the mount structure
1190 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001191 error = xfs_rtmount_inodes(mp);
1192 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 /*
1194 * Free up the root inode.
1195 */
1196 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1197 goto error4;
1198 }
1199
1200 /*
David Chinneree1c0902008-03-06 13:45:50 +11001201 * If fs is not mounted readonly, then update the superblock changes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 */
David Chinnere5720ee2008-04-10 12:21:18 +10001203 if (update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1204 error = xfs_mount_log_sb(mp, update_flags);
1205 if (error) {
1206 cmn_err(CE_WARN, "XFS: failed to write sb changes");
1207 goto error4;
1208 }
1209 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210
1211 /*
1212 * Initialise the XFS quota management subsystem for this mount
1213 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001214 error = XFS_QM_INIT(mp, &quotamount, &quotaflags);
1215 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 goto error4;
1217
1218 /*
1219 * Finish recovering the file system. This part needed to be
1220 * delayed until after the root and real-time bitmap inodes
1221 * were consistently read in.
1222 */
1223 error = xfs_log_mount_finish(mp, mfsi_flags);
1224 if (error) {
1225 cmn_err(CE_WARN, "XFS: log mount finish failed");
1226 goto error4;
1227 }
1228
1229 /*
1230 * Complete the quota initialisation, post-log-replay component.
1231 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001232 error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags);
1233 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 goto error4;
1235
David Chinner84e1e992007-06-18 16:50:27 +10001236 /*
1237 * Now we are mounted, reserve a small amount of unused space for
1238 * privileged transactions. This is needed so that transaction
1239 * space required for critical operations can dip into this pool
1240 * when at ENOSPC. This is needed for operations like create with
1241 * attr, unwritten extent conversion at ENOSPC, etc. Data allocations
1242 * are not allowed to use this reserved space.
1243 *
1244 * We default to 5% or 1024 fsbs of space reserved, whichever is smaller.
1245 * This may drive us straight to ENOSPC on mount, but that implies
David Chinner714082b2008-04-10 12:20:03 +10001246 * we were already there on the last unmount. Warn if this occurs.
David Chinner84e1e992007-06-18 16:50:27 +10001247 */
Christoph Hellwig39726be2007-06-18 17:57:45 +10001248 resblks = mp->m_sb.sb_dblocks;
1249 do_div(resblks, 20);
1250 resblks = min_t(__uint64_t, resblks, 1024);
David Chinner714082b2008-04-10 12:20:03 +10001251 error = xfs_reserve_blocks(mp, &resblks, NULL);
1252 if (error)
1253 cmn_err(CE_WARN, "XFS: Unable to allocate reserve blocks. "
1254 "Continuing without a reserve pool.");
David Chinner84e1e992007-06-18 16:50:27 +10001255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 return 0;
1257
1258 error4:
1259 /*
1260 * Free up the root inode.
1261 */
Christoph Hellwig43355092008-03-27 18:01:08 +11001262 IRELE(rip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 error3:
1264 xfs_log_unmount_dealloc(mp);
1265 error2:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 for (agno = 0; agno < sbp->sb_agcount; agno++)
1267 if (mp->m_perag[agno].pagb_list)
1268 kmem_free(mp->m_perag[agno].pagb_list,
1269 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1270 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1271 mp->m_perag = NULL;
1272 /* FALLTHROUGH */
1273 error1:
1274 if (uuid_mounted)
1275 xfs_uuid_unmount(mp);
1276 xfs_freesb(mp);
1277 return error;
1278}
1279
1280/*
1281 * xfs_unmountfs
1282 *
1283 * This flushes out the inodes,dquots and the superblock, unmounts the
1284 * log and makes sure that incore structures are freed.
1285 */
1286int
1287xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1288{
David Chinner84e1e992007-06-18 16:50:27 +10001289 __uint64_t resblks;
David Chinner714082b2008-04-10 12:20:03 +10001290 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
David Chinner641c56f2007-06-18 16:50:17 +10001292 /*
1293 * We can potentially deadlock here if we have an inode cluster
1294 * that has been freed has it's buffer still pinned in memory because
1295 * the transaction is still sitting in a iclog. The stale inodes
1296 * on that buffer will have their flush locks held until the
1297 * transaction hits the disk and the callbacks run. the inode
1298 * flush takes the flush lock unconditionally and with nothing to
1299 * push out the iclog we will never get that unlocked. hence we
1300 * need to force the log first.
1301 */
1302 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
Christoph Hellwigefa80272005-06-21 15:37:17 +10001303 xfs_iflush_all(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
Nathan Scottee2a4f72006-01-11 15:33:36 +11001305 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307 /*
1308 * Flush out the log synchronously so that we know for sure
1309 * that nothing is pinned. This is important because bflush()
1310 * will skip pinned buffers.
1311 */
1312 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1313
1314 xfs_binval(mp->m_ddev_targp);
1315 if (mp->m_rtdev_targp) {
1316 xfs_binval(mp->m_rtdev_targp);
1317 }
1318
David Chinner84e1e992007-06-18 16:50:27 +10001319 /*
1320 * Unreserve any blocks we have so that when we unmount we don't account
1321 * the reserved free space as used. This is really only necessary for
1322 * lazy superblock counting because it trusts the incore superblock
1323 * counters to be aboslutely correct on clean unmount.
1324 *
1325 * We don't bother correcting this elsewhere for lazy superblock
1326 * counting because on mount of an unclean filesystem we reconstruct the
1327 * correct counter value and this is irrelevant.
1328 *
1329 * For non-lazy counter filesystems, this doesn't matter at all because
1330 * we only every apply deltas to the superblock and hence the incore
1331 * value does not matter....
1332 */
1333 resblks = 0;
David Chinner714082b2008-04-10 12:20:03 +10001334 error = xfs_reserve_blocks(mp, &resblks, NULL);
1335 if (error)
1336 cmn_err(CE_WARN, "XFS: Unable to free reserved block pool. "
1337 "Freespace may not be correct on next mount.");
1338
David Chinnere5720ee2008-04-10 12:21:18 +10001339 error = xfs_log_sbcount(mp, 1);
1340 if (error)
1341 cmn_err(CE_WARN, "XFS: Unable to update superblock counters. "
1342 "Freespace may not be correct on next mount.");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 xfs_unmountfs_writesb(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 xfs_unmountfs_wait(mp); /* wait for async bufs */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 xfs_log_unmount(mp); /* Done! No more fs ops. */
1346
1347 xfs_freesb(mp);
1348
1349 /*
1350 * All inodes from this mount point should be freed.
1351 */
1352 ASSERT(mp->m_inodes == NULL);
1353
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 xfs_unmountfs_close(mp, cr);
1355 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1356 xfs_uuid_unmount(mp);
1357
1358#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
Christoph Hellwig0ce4cfd2007-08-30 17:20:53 +10001359 xfs_errortag_clearall(mp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360#endif
Christoph Hellwig745f6912007-08-30 17:20:39 +10001361 xfs_mount_free(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 return 0;
1363}
1364
1365void
1366xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1367{
Jesper Juhl49ee6c92007-08-16 16:25:42 +10001368 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 xfs_free_buftarg(mp->m_logdev_targp, 1);
1370 if (mp->m_rtdev_targp)
1371 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1372 xfs_free_buftarg(mp->m_ddev_targp, 0);
1373}
1374
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001375STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376xfs_unmountfs_wait(xfs_mount_t *mp)
1377{
1378 if (mp->m_logdev_targp != mp->m_ddev_targp)
1379 xfs_wait_buftarg(mp->m_logdev_targp);
1380 if (mp->m_rtdev_targp)
1381 xfs_wait_buftarg(mp->m_rtdev_targp);
1382 xfs_wait_buftarg(mp->m_ddev_targp);
1383}
1384
1385int
David Chinner92821e22007-05-24 15:26:31 +10001386xfs_fs_writable(xfs_mount_t *mp)
1387{
Christoph Hellwigb267ce92007-08-30 17:21:30 +10001388 return !(xfs_test_for_freeze(mp) || XFS_FORCED_SHUTDOWN(mp) ||
Christoph Hellwigbd186aa2007-08-30 17:21:12 +10001389 (mp->m_flags & XFS_MOUNT_RDONLY));
David Chinner92821e22007-05-24 15:26:31 +10001390}
1391
1392/*
1393 * xfs_log_sbcount
1394 *
1395 * Called either periodically to keep the on disk superblock values
1396 * roughly up to date or from unmount to make sure the values are
1397 * correct on a clean unmount.
1398 *
1399 * Note this code can be called during the process of freezing, so
1400 * we may need to use the transaction allocator which does not not
1401 * block when the transaction subsystem is in its frozen state.
1402 */
1403int
1404xfs_log_sbcount(
1405 xfs_mount_t *mp,
1406 uint sync)
1407{
1408 xfs_trans_t *tp;
1409 int error;
1410
1411 if (!xfs_fs_writable(mp))
1412 return 0;
1413
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10001414 xfs_icsb_sync_counters(mp, 0);
David Chinner92821e22007-05-24 15:26:31 +10001415
1416 /*
1417 * we don't need to do this if we are updating the superblock
1418 * counters on every modification.
1419 */
1420 if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
1421 return 0;
1422
1423 tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT);
1424 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1425 XFS_DEFAULT_LOG_COUNT);
1426 if (error) {
1427 xfs_trans_cancel(tp, 0);
1428 return error;
1429 }
1430
1431 xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS);
1432 if (sync)
1433 xfs_trans_set_sync(tp);
David Chinnere5720ee2008-04-10 12:21:18 +10001434 error = xfs_trans_commit(tp, 0);
1435 return error;
David Chinner92821e22007-05-24 15:26:31 +10001436}
1437
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10001438STATIC void
1439xfs_mark_shared_ro(
1440 xfs_mount_t *mp,
1441 xfs_buf_t *bp)
1442{
1443 xfs_dsb_t *sb = XFS_BUF_TO_SBP(bp);
1444 __uint16_t version;
1445
1446 if (!(sb->sb_flags & XFS_SBF_READONLY))
1447 sb->sb_flags |= XFS_SBF_READONLY;
1448
1449 version = be16_to_cpu(sb->sb_versionnum);
1450 if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 ||
1451 !(version & XFS_SB_VERSION_SHAREDBIT))
1452 version |= XFS_SB_VERSION_SHAREDBIT;
1453 sb->sb_versionnum = cpu_to_be16(version);
1454}
1455
David Chinner92821e22007-05-24 15:26:31 +10001456int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457xfs_unmountfs_writesb(xfs_mount_t *mp)
1458{
1459 xfs_buf_t *sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 int error = 0;
1461
1462 /*
1463 * skip superblock write if fs is read-only, or
1464 * if we are doing a forced umount.
1465 */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +10001466 if (!((mp->m_flags & XFS_MOUNT_RDONLY) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 XFS_FORCED_SHUTDOWN(mp))) {
David Chinner8d280b92006-03-14 13:13:09 +11001468
David Chinner92821e22007-05-24 15:26:31 +10001469 sbp = xfs_getsb(mp, 0);
David Chinner8d280b92006-03-14 13:13:09 +11001470
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 /*
1472 * mark shared-readonly if desired
1473 */
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10001474 if (mp->m_mk_sharedro)
1475 xfs_mark_shared_ro(mp, sbp);
David Chinner92821e22007-05-24 15:26:31 +10001476
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 XFS_BUF_UNDONE(sbp);
1478 XFS_BUF_UNREAD(sbp);
1479 XFS_BUF_UNDELAYWRITE(sbp);
1480 XFS_BUF_WRITE(sbp);
1481 XFS_BUF_UNASYNC(sbp);
1482 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1483 xfsbdstrat(mp, sbp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 error = xfs_iowait(sbp);
1485 if (error)
1486 xfs_ioerror_alert("xfs_unmountfs_writesb",
1487 mp, sbp, XFS_BUF_ADDR(sbp));
1488 if (error && mp->m_mk_sharedro)
1489 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
David Chinner92821e22007-05-24 15:26:31 +10001490 xfs_buf_relse(sbp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001492 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493}
1494
1495/*
1496 * xfs_mod_sb() can be used to copy arbitrary changes to the
1497 * in-core superblock into the superblock buffer to be logged.
1498 * It does not provide the higher level of locking that is
1499 * needed to protect the in-core superblock from concurrent
1500 * access.
1501 */
1502void
1503xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1504{
1505 xfs_buf_t *bp;
1506 int first;
1507 int last;
1508 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 xfs_sb_field_t f;
1510
1511 ASSERT(fields);
1512 if (!fields)
1513 return;
1514 mp = tp->t_mountp;
1515 bp = xfs_trans_getsb(tp, mp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 first = sizeof(xfs_sb_t);
1517 last = 0;
1518
1519 /* translate/copy */
1520
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10001521 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
1523 /* find modified range */
1524
1525 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1526 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1527 first = xfs_sb_info[f].offset;
1528
1529 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1530 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1531 last = xfs_sb_info[f + 1].offset - 1;
1532
1533 xfs_trans_log_buf(tp, bp, first, last);
1534}
Yingping Lud210a282006-06-09 14:55:18 +10001535
Yingping Lud210a282006-06-09 14:55:18 +10001536
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537/*
1538 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1539 * a delta to a specified field in the in-core superblock. Simply
1540 * switch on the field indicated and apply the delta to that field.
1541 * Fields are not allowed to dip below zero, so if the delta would
1542 * do this do not apply it and return EINVAL.
1543 *
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001544 * The m_sb_lock must be held when this routine is called.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 */
David Chinner8d280b92006-03-14 13:13:09 +11001546int
David Chinner20f4ebf2007-02-10 18:36:10 +11001547xfs_mod_incore_sb_unlocked(
1548 xfs_mount_t *mp,
1549 xfs_sb_field_t field,
1550 int64_t delta,
1551 int rsvd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552{
1553 int scounter; /* short counter for 32 bit fields */
1554 long long lcounter; /* long counter for 64 bit fields */
1555 long long res_used, rem;
1556
1557 /*
1558 * With the in-core superblock spin lock held, switch
1559 * on the indicated field. Apply the delta to the
1560 * proper field. If the fields value would dip below
1561 * 0, then do not apply the delta and return EINVAL.
1562 */
1563 switch (field) {
1564 case XFS_SBS_ICOUNT:
1565 lcounter = (long long)mp->m_sb.sb_icount;
1566 lcounter += delta;
1567 if (lcounter < 0) {
1568 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001569 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 }
1571 mp->m_sb.sb_icount = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001572 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 case XFS_SBS_IFREE:
1574 lcounter = (long long)mp->m_sb.sb_ifree;
1575 lcounter += delta;
1576 if (lcounter < 0) {
1577 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001578 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 }
1580 mp->m_sb.sb_ifree = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001581 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 case XFS_SBS_FDBLOCKS:
David Chinner4be536d2006-09-07 14:26:50 +10001583 lcounter = (long long)
1584 mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1586
1587 if (delta > 0) { /* Putting blocks back */
1588 if (res_used > delta) {
1589 mp->m_resblks_avail += delta;
1590 } else {
1591 rem = delta - res_used;
1592 mp->m_resblks_avail = mp->m_resblks;
1593 lcounter += rem;
1594 }
1595 } else { /* Taking blocks away */
1596
1597 lcounter += delta;
1598
1599 /*
1600 * If were out of blocks, use any available reserved blocks if
1601 * were allowed to.
1602 */
1603
1604 if (lcounter < 0) {
1605 if (rsvd) {
1606 lcounter = (long long)mp->m_resblks_avail + delta;
1607 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001608 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 }
1610 mp->m_resblks_avail = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001611 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 } else { /* not reserved */
Jesper Juhl014c2542006-01-15 02:37:08 +01001613 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 }
1615 }
1616 }
1617
David Chinner4be536d2006-09-07 14:26:50 +10001618 mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001619 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 case XFS_SBS_FREXTENTS:
1621 lcounter = (long long)mp->m_sb.sb_frextents;
1622 lcounter += delta;
1623 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001624 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 }
1626 mp->m_sb.sb_frextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001627 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 case XFS_SBS_DBLOCKS:
1629 lcounter = (long long)mp->m_sb.sb_dblocks;
1630 lcounter += delta;
1631 if (lcounter < 0) {
1632 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001633 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 }
1635 mp->m_sb.sb_dblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001636 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 case XFS_SBS_AGCOUNT:
1638 scounter = mp->m_sb.sb_agcount;
1639 scounter += delta;
1640 if (scounter < 0) {
1641 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001642 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 }
1644 mp->m_sb.sb_agcount = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 case XFS_SBS_IMAX_PCT:
1647 scounter = mp->m_sb.sb_imax_pct;
1648 scounter += delta;
1649 if (scounter < 0) {
1650 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001651 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 }
1653 mp->m_sb.sb_imax_pct = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001654 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 case XFS_SBS_REXTSIZE:
1656 scounter = mp->m_sb.sb_rextsize;
1657 scounter += delta;
1658 if (scounter < 0) {
1659 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001660 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 }
1662 mp->m_sb.sb_rextsize = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001663 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 case XFS_SBS_RBMBLOCKS:
1665 scounter = mp->m_sb.sb_rbmblocks;
1666 scounter += delta;
1667 if (scounter < 0) {
1668 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001669 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 }
1671 mp->m_sb.sb_rbmblocks = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001672 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 case XFS_SBS_RBLOCKS:
1674 lcounter = (long long)mp->m_sb.sb_rblocks;
1675 lcounter += delta;
1676 if (lcounter < 0) {
1677 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001678 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 }
1680 mp->m_sb.sb_rblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001681 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 case XFS_SBS_REXTENTS:
1683 lcounter = (long long)mp->m_sb.sb_rextents;
1684 lcounter += delta;
1685 if (lcounter < 0) {
1686 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001687 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 }
1689 mp->m_sb.sb_rextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001690 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 case XFS_SBS_REXTSLOG:
1692 scounter = mp->m_sb.sb_rextslog;
1693 scounter += delta;
1694 if (scounter < 0) {
1695 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001696 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 }
1698 mp->m_sb.sb_rextslog = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001699 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 default:
1701 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001702 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 }
1704}
1705
1706/*
1707 * xfs_mod_incore_sb() is used to change a field in the in-core
1708 * superblock structure by the specified delta. This modification
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001709 * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 * routine to do the work.
1711 */
1712int
David Chinner20f4ebf2007-02-10 18:36:10 +11001713xfs_mod_incore_sb(
1714 xfs_mount_t *mp,
1715 xfs_sb_field_t field,
1716 int64_t delta,
1717 int rsvd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 int status;
1720
David Chinner8d280b92006-03-14 13:13:09 +11001721 /* check for per-cpu counters */
1722 switch (field) {
1723#ifdef HAVE_PERCPU_SB
1724 case XFS_SBS_ICOUNT:
1725 case XFS_SBS_IFREE:
1726 case XFS_SBS_FDBLOCKS:
1727 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1728 status = xfs_icsb_modify_counters(mp, field,
1729 delta, rsvd);
1730 break;
1731 }
1732 /* FALLTHROUGH */
1733#endif
1734 default:
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001735 spin_lock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001736 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001737 spin_unlock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001738 break;
1739 }
1740
Jesper Juhl014c2542006-01-15 02:37:08 +01001741 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742}
1743
1744/*
1745 * xfs_mod_incore_sb_batch() is used to change more than one field
1746 * in the in-core superblock structure at a time. This modification
1747 * is protected by a lock internal to this module. The fields and
1748 * changes to those fields are specified in the array of xfs_mod_sb
1749 * structures passed in.
1750 *
1751 * Either all of the specified deltas will be applied or none of
1752 * them will. If any modified field dips below 0, then all modifications
1753 * will be backed out and EINVAL will be returned.
1754 */
1755int
1756xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1757{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 int status=0;
1759 xfs_mod_sb_t *msbp;
1760
1761 /*
1762 * Loop through the array of mod structures and apply each
1763 * individually. If any fail, then back out all those
1764 * which have already been applied. Do all of this within
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001765 * the scope of the m_sb_lock so that all of the changes will
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 * be atomic.
1767 */
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001768 spin_lock(&mp->m_sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 msbp = &msb[0];
1770 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1771 /*
1772 * Apply the delta at index n. If it fails, break
1773 * from the loop so we'll fall into the undo loop
1774 * below.
1775 */
David Chinner8d280b92006-03-14 13:13:09 +11001776 switch (msbp->msb_field) {
1777#ifdef HAVE_PERCPU_SB
1778 case XFS_SBS_ICOUNT:
1779 case XFS_SBS_IFREE:
1780 case XFS_SBS_FDBLOCKS:
1781 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001782 spin_unlock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11001783 status = xfs_icsb_modify_counters(mp,
David Chinner8d280b92006-03-14 13:13:09 +11001784 msbp->msb_field,
1785 msbp->msb_delta, rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001786 spin_lock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001787 break;
1788 }
1789 /* FALLTHROUGH */
1790#endif
1791 default:
1792 status = xfs_mod_incore_sb_unlocked(mp,
1793 msbp->msb_field,
1794 msbp->msb_delta, rsvd);
1795 break;
1796 }
1797
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 if (status != 0) {
1799 break;
1800 }
1801 }
1802
1803 /*
1804 * If we didn't complete the loop above, then back out
1805 * any changes made to the superblock. If you add code
1806 * between the loop above and here, make sure that you
1807 * preserve the value of status. Loop back until
1808 * we step below the beginning of the array. Make sure
1809 * we don't touch anything back there.
1810 */
1811 if (status != 0) {
1812 msbp--;
1813 while (msbp >= msb) {
David Chinner8d280b92006-03-14 13:13:09 +11001814 switch (msbp->msb_field) {
1815#ifdef HAVE_PERCPU_SB
1816 case XFS_SBS_ICOUNT:
1817 case XFS_SBS_IFREE:
1818 case XFS_SBS_FDBLOCKS:
1819 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001820 spin_unlock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11001821 status = xfs_icsb_modify_counters(mp,
David Chinner8d280b92006-03-14 13:13:09 +11001822 msbp->msb_field,
1823 -(msbp->msb_delta),
1824 rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001825 spin_lock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001826 break;
1827 }
1828 /* FALLTHROUGH */
1829#endif
1830 default:
1831 status = xfs_mod_incore_sb_unlocked(mp,
1832 msbp->msb_field,
1833 -(msbp->msb_delta),
1834 rsvd);
1835 break;
1836 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 ASSERT(status == 0);
1838 msbp--;
1839 }
1840 }
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001841 spin_unlock(&mp->m_sb_lock);
Jesper Juhl014c2542006-01-15 02:37:08 +01001842 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843}
1844
1845/*
1846 * xfs_getsb() is called to obtain the buffer for the superblock.
1847 * The buffer is returned locked and read in from disk.
1848 * The buffer should be released with a call to xfs_brelse().
1849 *
1850 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1851 * the superblock buffer if it can be locked without sleeping.
1852 * If it can't then we'll return NULL.
1853 */
1854xfs_buf_t *
1855xfs_getsb(
1856 xfs_mount_t *mp,
1857 int flags)
1858{
1859 xfs_buf_t *bp;
1860
1861 ASSERT(mp->m_sb_bp != NULL);
1862 bp = mp->m_sb_bp;
1863 if (flags & XFS_BUF_TRYLOCK) {
1864 if (!XFS_BUF_CPSEMA(bp)) {
1865 return NULL;
1866 }
1867 } else {
1868 XFS_BUF_PSEMA(bp, PRIBIO);
1869 }
1870 XFS_BUF_HOLD(bp);
1871 ASSERT(XFS_BUF_ISDONE(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001872 return bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873}
1874
1875/*
1876 * Used to free the superblock along various error paths.
1877 */
1878void
1879xfs_freesb(
1880 xfs_mount_t *mp)
1881{
1882 xfs_buf_t *bp;
1883
1884 /*
1885 * Use xfs_getsb() so that the buffer will be locked
1886 * when we call xfs_buf_relse().
1887 */
1888 bp = xfs_getsb(mp, 0);
1889 XFS_BUF_UNMANAGE(bp);
1890 xfs_buf_relse(bp);
1891 mp->m_sb_bp = NULL;
1892}
1893
1894/*
1895 * See if the UUID is unique among mounted XFS filesystems.
1896 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1897 */
1898STATIC int
1899xfs_uuid_mount(
1900 xfs_mount_t *mp)
1901{
1902 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1903 cmn_err(CE_WARN,
1904 "XFS: Filesystem %s has nil UUID - can't mount",
1905 mp->m_fsname);
1906 return -1;
1907 }
1908 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1909 cmn_err(CE_WARN,
1910 "XFS: Filesystem %s has duplicate UUID - can't mount",
1911 mp->m_fsname);
1912 return -1;
1913 }
1914 return 0;
1915}
1916
1917/*
1918 * Remove filesystem from the UUID table.
1919 */
1920STATIC void
1921xfs_uuid_unmount(
1922 xfs_mount_t *mp)
1923{
1924 uuid_table_remove(&mp->m_sb.sb_uuid);
1925}
1926
1927/*
1928 * Used to log changes to the superblock unit and width fields which could
Eric Sandeene6957ea2008-04-10 12:19:34 +10001929 * be altered by the mount options, as well as any potential sb_features2
1930 * fixup. Only the first superblock is updated.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 */
David Chinnere5720ee2008-04-10 12:21:18 +10001932STATIC int
David Chinneree1c0902008-03-06 13:45:50 +11001933xfs_mount_log_sb(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 xfs_mount_t *mp,
1935 __int64_t fields)
1936{
1937 xfs_trans_t *tp;
David Chinnere5720ee2008-04-10 12:21:18 +10001938 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
David Chinneree1c0902008-03-06 13:45:50 +11001940 ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID |
1941 XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942
1943 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
David Chinnere5720ee2008-04-10 12:21:18 +10001944 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1945 XFS_DEFAULT_LOG_COUNT);
1946 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 xfs_trans_cancel(tp, 0);
David Chinnere5720ee2008-04-10 12:21:18 +10001948 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 }
1950 xfs_mod_sb(tp, fields);
David Chinnere5720ee2008-04-10 12:21:18 +10001951 error = xfs_trans_commit(tp, 0);
1952 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953}
David Chinner8d280b92006-03-14 13:13:09 +11001954
1955
1956#ifdef HAVE_PERCPU_SB
1957/*
1958 * Per-cpu incore superblock counters
1959 *
1960 * Simple concept, difficult implementation
1961 *
1962 * Basically, replace the incore superblock counters with a distributed per cpu
1963 * counter for contended fields (e.g. free block count).
1964 *
1965 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1966 * hence needs to be accurately read when we are running low on space. Hence
1967 * there is a method to enable and disable the per-cpu counters based on how
1968 * much "stuff" is available in them.
1969 *
1970 * Basically, a counter is enabled if there is enough free resource to justify
1971 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1972 * ENOSPC), then we disable the counters to synchronise all callers and
1973 * re-distribute the available resources.
1974 *
1975 * If, once we redistributed the available resources, we still get a failure,
1976 * we disable the per-cpu counter and go through the slow path.
1977 *
1978 * The slow path is the current xfs_mod_incore_sb() function. This means that
1979 * when we disable a per-cpu counter, we need to drain it's resources back to
1980 * the global superblock. We do this after disabling the counter to prevent
1981 * more threads from queueing up on the counter.
1982 *
1983 * Essentially, this means that we still need a lock in the fast path to enable
1984 * synchronisation between the global counters and the per-cpu counters. This
1985 * is not a problem because the lock will be local to a CPU almost all the time
1986 * and have little contention except when we get to ENOSPC conditions.
1987 *
1988 * Basically, this lock becomes a barrier that enables us to lock out the fast
1989 * path while we do things like enabling and disabling counters and
1990 * synchronising the counters.
1991 *
1992 * Locking rules:
1993 *
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001994 * 1. m_sb_lock before picking up per-cpu locks
David Chinner8d280b92006-03-14 13:13:09 +11001995 * 2. per-cpu locks always picked up via for_each_online_cpu() order
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001996 * 3. accurate counter sync requires m_sb_lock + per cpu locks
David Chinner8d280b92006-03-14 13:13:09 +11001997 * 4. modifying per-cpu counters requires holding per-cpu lock
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001998 * 5. modifying global counters requires holding m_sb_lock
1999 * 6. enabling or disabling a counter requires holding the m_sb_lock
David Chinner8d280b92006-03-14 13:13:09 +11002000 * and _none_ of the per-cpu locks.
2001 *
2002 * Disabled counters are only ever re-enabled by a balance operation
2003 * that results in more free resources per CPU than a given threshold.
2004 * To ensure counters don't remain disabled, they are rebalanced when
2005 * the global resource goes above a higher threshold (i.e. some hysteresis
2006 * is present to prevent thrashing).
David Chinner8d280b92006-03-14 13:13:09 +11002007 */
David Chinnere8234a62006-03-14 13:23:52 +11002008
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002009#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11002010/*
2011 * hot-plug CPU notifier support.
2012 *
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002013 * We need a notifier per filesystem as we need to be able to identify
2014 * the filesystem to balance the counters out. This is achieved by
2015 * having a notifier block embedded in the xfs_mount_t and doing pointer
2016 * magic to get the mount pointer from the notifier block address.
David Chinnere8234a62006-03-14 13:23:52 +11002017 */
2018STATIC int
2019xfs_icsb_cpu_notify(
2020 struct notifier_block *nfb,
2021 unsigned long action,
2022 void *hcpu)
2023{
2024 xfs_icsb_cnts_t *cntp;
2025 xfs_mount_t *mp;
David Chinnere8234a62006-03-14 13:23:52 +11002026
2027 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
2028 cntp = (xfs_icsb_cnts_t *)
2029 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
2030 switch (action) {
2031 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07002032 case CPU_UP_PREPARE_FROZEN:
David Chinnere8234a62006-03-14 13:23:52 +11002033 /* Easy Case - initialize the area and locks, and
2034 * then rebalance when online does everything else for us. */
David Chinner01e1b692006-03-14 13:29:16 +11002035 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11002036 break;
2037 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07002038 case CPU_ONLINE_FROZEN:
David Chinner03135cf2007-02-10 18:35:15 +11002039 xfs_icsb_lock(mp);
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002040 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
2041 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
2042 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
David Chinner03135cf2007-02-10 18:35:15 +11002043 xfs_icsb_unlock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11002044 break;
2045 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07002046 case CPU_DEAD_FROZEN:
David Chinnere8234a62006-03-14 13:23:52 +11002047 /* Disable all the counters, then fold the dead cpu's
2048 * count into the total on the global superblock and
2049 * re-enable the counters. */
David Chinner03135cf2007-02-10 18:35:15 +11002050 xfs_icsb_lock(mp);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002051 spin_lock(&mp->m_sb_lock);
David Chinnere8234a62006-03-14 13:23:52 +11002052 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
2053 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
2054 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
2055
2056 mp->m_sb.sb_icount += cntp->icsb_icount;
2057 mp->m_sb.sb_ifree += cntp->icsb_ifree;
2058 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
2059
David Chinner01e1b692006-03-14 13:29:16 +11002060 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11002061
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002062 xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0);
2063 xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0);
2064 xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002065 spin_unlock(&mp->m_sb_lock);
David Chinner03135cf2007-02-10 18:35:15 +11002066 xfs_icsb_unlock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11002067 break;
2068 }
2069
2070 return NOTIFY_OK;
2071}
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002072#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11002073
David Chinner8d280b92006-03-14 13:13:09 +11002074int
2075xfs_icsb_init_counters(
2076 xfs_mount_t *mp)
2077{
2078 xfs_icsb_cnts_t *cntp;
2079 int i;
2080
2081 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
2082 if (mp->m_sb_cnts == NULL)
2083 return -ENOMEM;
2084
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002085#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11002086 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
2087 mp->m_icsb_notifier.priority = 0;
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002088 register_hotcpu_notifier(&mp->m_icsb_notifier);
2089#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11002090
David Chinner8d280b92006-03-14 13:13:09 +11002091 for_each_online_cpu(i) {
2092 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11002093 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinner8d280b92006-03-14 13:13:09 +11002094 }
David Chinner20b64282007-02-10 18:35:09 +11002095
2096 mutex_init(&mp->m_icsb_mutex);
2097
David Chinner8d280b92006-03-14 13:13:09 +11002098 /*
2099 * start with all counters disabled so that the
2100 * initial balance kicks us off correctly
2101 */
2102 mp->m_icsb_counters = -1;
2103 return 0;
2104}
2105
Lachlan McIlroy5478eea2007-02-10 18:36:29 +11002106void
2107xfs_icsb_reinit_counters(
2108 xfs_mount_t *mp)
2109{
2110 xfs_icsb_lock(mp);
2111 /*
2112 * start with all counters disabled so that the
2113 * initial balance kicks us off correctly
2114 */
2115 mp->m_icsb_counters = -1;
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002116 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
2117 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
2118 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
Lachlan McIlroy5478eea2007-02-10 18:36:29 +11002119 xfs_icsb_unlock(mp);
2120}
2121
David Chinner8d280b92006-03-14 13:13:09 +11002122STATIC void
2123xfs_icsb_destroy_counters(
2124 xfs_mount_t *mp)
2125{
David Chinnere8234a62006-03-14 13:23:52 +11002126 if (mp->m_sb_cnts) {
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002127 unregister_hotcpu_notifier(&mp->m_icsb_notifier);
David Chinner8d280b92006-03-14 13:13:09 +11002128 free_percpu(mp->m_sb_cnts);
David Chinnere8234a62006-03-14 13:23:52 +11002129 }
David Chinner03135cf2007-02-10 18:35:15 +11002130 mutex_destroy(&mp->m_icsb_mutex);
David Chinner8d280b92006-03-14 13:13:09 +11002131}
2132
David Chinner7989cb82007-02-10 18:34:56 +11002133STATIC_INLINE void
David Chinner01e1b692006-03-14 13:29:16 +11002134xfs_icsb_lock_cntr(
2135 xfs_icsb_cnts_t *icsbp)
2136{
2137 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
2138 ndelay(1000);
2139 }
2140}
2141
David Chinner7989cb82007-02-10 18:34:56 +11002142STATIC_INLINE void
David Chinner01e1b692006-03-14 13:29:16 +11002143xfs_icsb_unlock_cntr(
2144 xfs_icsb_cnts_t *icsbp)
2145{
2146 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
2147}
2148
David Chinner8d280b92006-03-14 13:13:09 +11002149
David Chinner7989cb82007-02-10 18:34:56 +11002150STATIC_INLINE void
David Chinner8d280b92006-03-14 13:13:09 +11002151xfs_icsb_lock_all_counters(
2152 xfs_mount_t *mp)
2153{
2154 xfs_icsb_cnts_t *cntp;
2155 int i;
2156
2157 for_each_online_cpu(i) {
2158 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11002159 xfs_icsb_lock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11002160 }
2161}
2162
David Chinner7989cb82007-02-10 18:34:56 +11002163STATIC_INLINE void
David Chinner8d280b92006-03-14 13:13:09 +11002164xfs_icsb_unlock_all_counters(
2165 xfs_mount_t *mp)
2166{
2167 xfs_icsb_cnts_t *cntp;
2168 int i;
2169
2170 for_each_online_cpu(i) {
2171 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11002172 xfs_icsb_unlock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11002173 }
2174}
2175
2176STATIC void
2177xfs_icsb_count(
2178 xfs_mount_t *mp,
2179 xfs_icsb_cnts_t *cnt,
2180 int flags)
2181{
2182 xfs_icsb_cnts_t *cntp;
2183 int i;
2184
2185 memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
2186
2187 if (!(flags & XFS_ICSB_LAZY_COUNT))
2188 xfs_icsb_lock_all_counters(mp);
2189
2190 for_each_online_cpu(i) {
2191 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
2192 cnt->icsb_icount += cntp->icsb_icount;
2193 cnt->icsb_ifree += cntp->icsb_ifree;
2194 cnt->icsb_fdblocks += cntp->icsb_fdblocks;
2195 }
2196
2197 if (!(flags & XFS_ICSB_LAZY_COUNT))
2198 xfs_icsb_unlock_all_counters(mp);
2199}
2200
2201STATIC int
2202xfs_icsb_counter_disabled(
2203 xfs_mount_t *mp,
2204 xfs_sb_field_t field)
2205{
2206 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
2207 return test_bit(field, &mp->m_icsb_counters);
2208}
2209
David Chinner36fbe6e2008-04-10 12:19:56 +10002210STATIC void
David Chinner8d280b92006-03-14 13:13:09 +11002211xfs_icsb_disable_counter(
2212 xfs_mount_t *mp,
2213 xfs_sb_field_t field)
2214{
2215 xfs_icsb_cnts_t cnt;
2216
2217 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
2218
David Chinner20b64282007-02-10 18:35:09 +11002219 /*
2220 * If we are already disabled, then there is nothing to do
2221 * here. We check before locking all the counters to avoid
2222 * the expensive lock operation when being called in the
2223 * slow path and the counter is already disabled. This is
2224 * safe because the only time we set or clear this state is under
2225 * the m_icsb_mutex.
2226 */
2227 if (xfs_icsb_counter_disabled(mp, field))
David Chinner36fbe6e2008-04-10 12:19:56 +10002228 return;
David Chinner20b64282007-02-10 18:35:09 +11002229
David Chinner8d280b92006-03-14 13:13:09 +11002230 xfs_icsb_lock_all_counters(mp);
2231 if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
2232 /* drain back to superblock */
2233
Christoph Hellwigce461932008-04-22 17:34:50 +10002234 xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT);
David Chinner8d280b92006-03-14 13:13:09 +11002235 switch(field) {
2236 case XFS_SBS_ICOUNT:
2237 mp->m_sb.sb_icount = cnt.icsb_icount;
2238 break;
2239 case XFS_SBS_IFREE:
2240 mp->m_sb.sb_ifree = cnt.icsb_ifree;
2241 break;
2242 case XFS_SBS_FDBLOCKS:
2243 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
2244 break;
2245 default:
2246 BUG();
2247 }
2248 }
2249
2250 xfs_icsb_unlock_all_counters(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002251}
2252
2253STATIC void
2254xfs_icsb_enable_counter(
2255 xfs_mount_t *mp,
2256 xfs_sb_field_t field,
2257 uint64_t count,
2258 uint64_t resid)
2259{
2260 xfs_icsb_cnts_t *cntp;
2261 int i;
2262
2263 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
2264
2265 xfs_icsb_lock_all_counters(mp);
2266 for_each_online_cpu(i) {
2267 cntp = per_cpu_ptr(mp->m_sb_cnts, i);
2268 switch (field) {
2269 case XFS_SBS_ICOUNT:
2270 cntp->icsb_icount = count + resid;
2271 break;
2272 case XFS_SBS_IFREE:
2273 cntp->icsb_ifree = count + resid;
2274 break;
2275 case XFS_SBS_FDBLOCKS:
2276 cntp->icsb_fdblocks = count + resid;
2277 break;
2278 default:
2279 BUG();
2280 break;
2281 }
2282 resid = 0;
2283 }
2284 clear_bit(field, &mp->m_icsb_counters);
2285 xfs_icsb_unlock_all_counters(mp);
2286}
2287
David Chinnerdbcabad2007-02-10 18:36:17 +11002288void
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002289xfs_icsb_sync_counters_locked(
David Chinner8d280b92006-03-14 13:13:09 +11002290 xfs_mount_t *mp,
2291 int flags)
2292{
2293 xfs_icsb_cnts_t cnt;
David Chinner8d280b92006-03-14 13:13:09 +11002294
David Chinner8d280b92006-03-14 13:13:09 +11002295 xfs_icsb_count(mp, &cnt, flags);
2296
David Chinner8d280b92006-03-14 13:13:09 +11002297 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
2298 mp->m_sb.sb_icount = cnt.icsb_icount;
2299 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
2300 mp->m_sb.sb_ifree = cnt.icsb_ifree;
2301 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
2302 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
David Chinner8d280b92006-03-14 13:13:09 +11002303}
2304
2305/*
2306 * Accurate update of per-cpu counters to incore superblock
2307 */
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002308void
David Chinner8d280b92006-03-14 13:13:09 +11002309xfs_icsb_sync_counters(
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002310 xfs_mount_t *mp,
2311 int flags)
David Chinner8d280b92006-03-14 13:13:09 +11002312{
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002313 spin_lock(&mp->m_sb_lock);
2314 xfs_icsb_sync_counters_locked(mp, flags);
2315 spin_unlock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11002316}
2317
2318/*
2319 * Balance and enable/disable counters as necessary.
2320 *
David Chinner20b64282007-02-10 18:35:09 +11002321 * Thresholds for re-enabling counters are somewhat magic. inode counts are
2322 * chosen to be the same number as single on disk allocation chunk per CPU, and
2323 * free blocks is something far enough zero that we aren't going thrash when we
2324 * get near ENOSPC. We also need to supply a minimum we require per cpu to
2325 * prevent looping endlessly when xfs_alloc_space asks for more than will
2326 * be distributed to a single CPU but each CPU has enough blocks to be
2327 * reenabled.
2328 *
2329 * Note that we can be called when counters are already disabled.
2330 * xfs_icsb_disable_counter() optimises the counter locking in this case to
2331 * prevent locking every per-cpu counter needlessly.
David Chinner8d280b92006-03-14 13:13:09 +11002332 */
David Chinner20b64282007-02-10 18:35:09 +11002333
2334#define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64
David Chinner4be536d2006-09-07 14:26:50 +10002335#define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \
David Chinner20b64282007-02-10 18:35:09 +11002336 (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp))
David Chinner8d280b92006-03-14 13:13:09 +11002337STATIC void
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002338xfs_icsb_balance_counter_locked(
David Chinner8d280b92006-03-14 13:13:09 +11002339 xfs_mount_t *mp,
2340 xfs_sb_field_t field,
David Chinner20b64282007-02-10 18:35:09 +11002341 int min_per_cpu)
David Chinner8d280b92006-03-14 13:13:09 +11002342{
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002343 uint64_t count, resid;
David Chinner8d280b92006-03-14 13:13:09 +11002344 int weight = num_online_cpus();
David Chinner20b64282007-02-10 18:35:09 +11002345 uint64_t min = (uint64_t)min_per_cpu;
David Chinner8d280b92006-03-14 13:13:09 +11002346
David Chinner8d280b92006-03-14 13:13:09 +11002347 /* disable counter and sync counter */
2348 xfs_icsb_disable_counter(mp, field);
2349
2350 /* update counters - first CPU gets residual*/
2351 switch (field) {
2352 case XFS_SBS_ICOUNT:
2353 count = mp->m_sb.sb_icount;
2354 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002355 if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002356 return;
David Chinner8d280b92006-03-14 13:13:09 +11002357 break;
2358 case XFS_SBS_IFREE:
2359 count = mp->m_sb.sb_ifree;
2360 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002361 if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002362 return;
David Chinner8d280b92006-03-14 13:13:09 +11002363 break;
2364 case XFS_SBS_FDBLOCKS:
2365 count = mp->m_sb.sb_fdblocks;
2366 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002367 if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp)))
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002368 return;
David Chinner8d280b92006-03-14 13:13:09 +11002369 break;
2370 default:
2371 BUG();
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002372 count = resid = 0; /* quiet, gcc */
David Chinner8d280b92006-03-14 13:13:09 +11002373 break;
2374 }
2375
2376 xfs_icsb_enable_counter(mp, field, count, resid);
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002377}
2378
2379STATIC void
2380xfs_icsb_balance_counter(
2381 xfs_mount_t *mp,
2382 xfs_sb_field_t fields,
2383 int min_per_cpu)
2384{
2385 spin_lock(&mp->m_sb_lock);
2386 xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu);
2387 spin_unlock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11002388}
2389
David Chinnera8272ce2007-11-23 16:28:09 +11002390STATIC int
David Chinner20b64282007-02-10 18:35:09 +11002391xfs_icsb_modify_counters(
David Chinner8d280b92006-03-14 13:13:09 +11002392 xfs_mount_t *mp,
2393 xfs_sb_field_t field,
David Chinner20f4ebf2007-02-10 18:36:10 +11002394 int64_t delta,
David Chinner20b64282007-02-10 18:35:09 +11002395 int rsvd)
David Chinner8d280b92006-03-14 13:13:09 +11002396{
2397 xfs_icsb_cnts_t *icsbp;
2398 long long lcounter; /* long counter for 64 bit fields */
Eric Sandeen007c61c2007-10-11 17:43:56 +10002399 int cpu, ret = 0;
David Chinner8d280b92006-03-14 13:13:09 +11002400
David Chinner20b64282007-02-10 18:35:09 +11002401 might_sleep();
David Chinner8d280b92006-03-14 13:13:09 +11002402again:
2403 cpu = get_cpu();
David Chinner20b64282007-02-10 18:35:09 +11002404 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu);
2405
2406 /*
2407 * if the counter is disabled, go to slow path
2408 */
David Chinner8d280b92006-03-14 13:13:09 +11002409 if (unlikely(xfs_icsb_counter_disabled(mp, field)))
2410 goto slow_path;
David Chinner20b64282007-02-10 18:35:09 +11002411 xfs_icsb_lock_cntr(icsbp);
2412 if (unlikely(xfs_icsb_counter_disabled(mp, field))) {
2413 xfs_icsb_unlock_cntr(icsbp);
2414 goto slow_path;
2415 }
David Chinner8d280b92006-03-14 13:13:09 +11002416
2417 switch (field) {
2418 case XFS_SBS_ICOUNT:
2419 lcounter = icsbp->icsb_icount;
2420 lcounter += delta;
2421 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002422 goto balance_counter;
David Chinner8d280b92006-03-14 13:13:09 +11002423 icsbp->icsb_icount = lcounter;
2424 break;
2425
2426 case XFS_SBS_IFREE:
2427 lcounter = icsbp->icsb_ifree;
2428 lcounter += delta;
2429 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002430 goto balance_counter;
David Chinner8d280b92006-03-14 13:13:09 +11002431 icsbp->icsb_ifree = lcounter;
2432 break;
2433
2434 case XFS_SBS_FDBLOCKS:
2435 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
2436
David Chinner4be536d2006-09-07 14:26:50 +10002437 lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002438 lcounter += delta;
2439 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002440 goto balance_counter;
David Chinner4be536d2006-09-07 14:26:50 +10002441 icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002442 break;
2443 default:
2444 BUG();
2445 break;
2446 }
David Chinner01e1b692006-03-14 13:29:16 +11002447 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002448 put_cpu();
David Chinner8d280b92006-03-14 13:13:09 +11002449 return 0;
2450
David Chinner8d280b92006-03-14 13:13:09 +11002451slow_path:
David Chinner20b64282007-02-10 18:35:09 +11002452 put_cpu();
2453
2454 /*
2455 * serialise with a mutex so we don't burn lots of cpu on
2456 * the superblock lock. We still need to hold the superblock
2457 * lock, however, when we modify the global structures.
2458 */
David Chinner03135cf2007-02-10 18:35:15 +11002459 xfs_icsb_lock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002460
2461 /*
2462 * Now running atomically.
2463 *
2464 * If the counter is enabled, someone has beaten us to rebalancing.
2465 * Drop the lock and try again in the fast path....
2466 */
2467 if (!(xfs_icsb_counter_disabled(mp, field))) {
David Chinner03135cf2007-02-10 18:35:15 +11002468 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002469 goto again;
2470 }
2471
2472 /*
2473 * The counter is currently disabled. Because we are
2474 * running atomically here, we know a rebalance cannot
2475 * be in progress. Hence we can go straight to operating
2476 * on the global superblock. We do not call xfs_mod_incore_sb()
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002477 * here even though we need to get the m_sb_lock. Doing so
David Chinner20b64282007-02-10 18:35:09 +11002478 * will cause us to re-enter this function and deadlock.
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002479 * Hence we get the m_sb_lock ourselves and then call
David Chinner20b64282007-02-10 18:35:09 +11002480 * xfs_mod_incore_sb_unlocked() as the unlocked path operates
2481 * directly on the global counters.
2482 */
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002483 spin_lock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11002484 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002485 spin_unlock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11002486
2487 /*
2488 * Now that we've modified the global superblock, we
2489 * may be able to re-enable the distributed counters
2490 * (e.g. lots of space just got freed). After that
2491 * we are done.
2492 */
2493 if (ret != ENOSPC)
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002494 xfs_icsb_balance_counter(mp, field, 0);
David Chinner03135cf2007-02-10 18:35:15 +11002495 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002496 return ret;
2497
2498balance_counter:
David Chinner01e1b692006-03-14 13:29:16 +11002499 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002500 put_cpu();
2501
David Chinner20b64282007-02-10 18:35:09 +11002502 /*
2503 * We may have multiple threads here if multiple per-cpu
2504 * counters run dry at the same time. This will mean we can
2505 * do more balances than strictly necessary but it is not
2506 * the common slowpath case.
2507 */
David Chinner03135cf2007-02-10 18:35:15 +11002508 xfs_icsb_lock(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002509
David Chinner20b64282007-02-10 18:35:09 +11002510 /*
2511 * running atomically.
2512 *
2513 * This will leave the counter in the correct state for future
2514 * accesses. After the rebalance, we simply try again and our retry
2515 * will either succeed through the fast path or slow path without
2516 * another balance operation being required.
2517 */
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002518 xfs_icsb_balance_counter(mp, field, delta);
David Chinner03135cf2007-02-10 18:35:15 +11002519 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002520 goto again;
David Chinner8d280b92006-03-14 13:13:09 +11002521}
2522
David Chinner8d280b92006-03-14 13:13:09 +11002523#endif