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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 *);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100050STATIC void xfs_unmountfs_wait(xfs_mount_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
David Chinner8d280b92006-03-14 13:13:09 +110052
53#ifdef HAVE_PERCPU_SB
David Chinner20f4ebf2007-02-10 18:36:10 +110054STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t,
Christoph Hellwig45af6c62008-04-22 17:34:44 +100055 int);
56STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t,
57 int);
David Chinner8d280b92006-03-14 13:13:09 +110058STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
David Chinner20f4ebf2007-02-10 18:36:10 +110059 int64_t, int);
David Chinner36fbe6e2008-04-10 12:19:56 +100060STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
David Chinner8d280b92006-03-14 13:13:09 +110061
62#else
63
Christoph Hellwig45af6c62008-04-22 17:34:44 +100064#define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
65#define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0)
David Chinner8d280b92006-03-14 13:13:09 +110066#define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
David Chinner8d280b92006-03-14 13:13:09 +110067
68#endif
69
Christoph Hellwig1df84c92006-01-11 15:29:52 +110070static const struct {
David Chinner8d280b92006-03-14 13:13:09 +110071 short offset;
72 short type; /* 0 = integer
73 * 1 = binary / string (no translation)
74 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070075} xfs_sb_info[] = {
76 { offsetof(xfs_sb_t, sb_magicnum), 0 },
77 { offsetof(xfs_sb_t, sb_blocksize), 0 },
78 { offsetof(xfs_sb_t, sb_dblocks), 0 },
79 { offsetof(xfs_sb_t, sb_rblocks), 0 },
80 { offsetof(xfs_sb_t, sb_rextents), 0 },
81 { offsetof(xfs_sb_t, sb_uuid), 1 },
82 { offsetof(xfs_sb_t, sb_logstart), 0 },
83 { offsetof(xfs_sb_t, sb_rootino), 0 },
84 { offsetof(xfs_sb_t, sb_rbmino), 0 },
85 { offsetof(xfs_sb_t, sb_rsumino), 0 },
86 { offsetof(xfs_sb_t, sb_rextsize), 0 },
87 { offsetof(xfs_sb_t, sb_agblocks), 0 },
88 { offsetof(xfs_sb_t, sb_agcount), 0 },
89 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
90 { offsetof(xfs_sb_t, sb_logblocks), 0 },
91 { offsetof(xfs_sb_t, sb_versionnum), 0 },
92 { offsetof(xfs_sb_t, sb_sectsize), 0 },
93 { offsetof(xfs_sb_t, sb_inodesize), 0 },
94 { offsetof(xfs_sb_t, sb_inopblock), 0 },
95 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
96 { offsetof(xfs_sb_t, sb_blocklog), 0 },
97 { offsetof(xfs_sb_t, sb_sectlog), 0 },
98 { offsetof(xfs_sb_t, sb_inodelog), 0 },
99 { offsetof(xfs_sb_t, sb_inopblog), 0 },
100 { offsetof(xfs_sb_t, sb_agblklog), 0 },
101 { offsetof(xfs_sb_t, sb_rextslog), 0 },
102 { offsetof(xfs_sb_t, sb_inprogress), 0 },
103 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
104 { offsetof(xfs_sb_t, sb_icount), 0 },
105 { offsetof(xfs_sb_t, sb_ifree), 0 },
106 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
107 { offsetof(xfs_sb_t, sb_frextents), 0 },
108 { offsetof(xfs_sb_t, sb_uquotino), 0 },
109 { offsetof(xfs_sb_t, sb_gquotino), 0 },
110 { offsetof(xfs_sb_t, sb_qflags), 0 },
111 { offsetof(xfs_sb_t, sb_flags), 0 },
112 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
113 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
114 { offsetof(xfs_sb_t, sb_unit), 0 },
115 { offsetof(xfs_sb_t, sb_width), 0 },
116 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
117 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
118 { offsetof(xfs_sb_t, sb_logsectsize),0 },
119 { offsetof(xfs_sb_t, sb_logsunit), 0 },
120 { offsetof(xfs_sb_t, sb_features2), 0 },
David Chinneree1c0902008-03-06 13:45:50 +1100121 { offsetof(xfs_sb_t, sb_bad_features2), 0 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 { sizeof(xfs_sb_t), 0 }
123};
124
125/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 * Free up the resources associated with a mount structure. Assume that
127 * the structure was initially zeroed, so we can tell which fields got
128 * initialized.
129 */
Christoph Hellwigc962fb72008-05-20 15:10:52 +1000130STATIC void
Christoph Hellwigff4f0382008-08-13 16:50:47 +1000131xfs_free_perag(
Christoph Hellwig745f6912007-08-30 17:20:39 +1000132 xfs_mount_t *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (mp->m_perag) {
135 int agno;
136
137 for (agno = 0; agno < mp->m_maxagi; agno++)
138 if (mp->m_perag[agno].pagb_list)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000139 kmem_free(mp->m_perag[agno].pagb_list);
140 kmem_free(mp->m_perag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
143
Nathan Scott4cc929e2007-05-14 18:24:02 +1000144/*
145 * Check size of device based on the (data/realtime) block count.
146 * Note: this check is used by the growfs code as well as mount.
147 */
148int
149xfs_sb_validate_fsb_count(
150 xfs_sb_t *sbp,
151 __uint64_t nblocks)
152{
153 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
154 ASSERT(sbp->sb_blocklog >= BBSHIFT);
155
156#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
157 if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
158 return E2BIG;
159#else /* Limited by UINT_MAX of sectors */
160 if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX)
161 return E2BIG;
162#endif
163 return 0;
164}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166/*
167 * Check the validity of the SB found.
168 */
169STATIC int
170xfs_mount_validate_sb(
171 xfs_mount_t *mp,
Nathan Scott764d1f82006-03-31 13:04:17 +1000172 xfs_sb_t *sbp,
173 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
175 /*
176 * If the log device and data device have the
177 * same device number, the log is internal.
178 * Consequently, the sb_logstart should be non-zero. If
179 * we have a zero sb_logstart in this case, we may be trying to mount
180 * a volume filesystem in a non-volume manner.
181 */
182 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000183 xfs_fs_mount_cmn_err(flags, "bad magic number");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return XFS_ERROR(EWRONGFS);
185 }
186
Eric Sandeen62118702008-03-06 13:44:28 +1100187 if (!xfs_sb_good_version(sbp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000188 xfs_fs_mount_cmn_err(flags, "bad version");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return XFS_ERROR(EWRONGFS);
190 }
191
192 if (unlikely(
193 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000194 xfs_fs_mount_cmn_err(flags,
195 "filesystem is marked as having an external log; "
196 "specify logdev on the\nmount command line.");
197 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
199
200 if (unlikely(
201 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000202 xfs_fs_mount_cmn_err(flags,
203 "filesystem is marked as having an internal log; "
204 "do not specify logdev on\nthe mount command line.");
205 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 }
207
208 /*
209 * More sanity checking. These were stolen directly from
210 * xfs_repair.
211 */
212 if (unlikely(
213 sbp->sb_agcount <= 0 ||
214 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
215 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
216 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
217 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
218 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
219 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
220 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
221 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
222 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
223 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
Nathan Scott9f989c92006-03-14 13:29:32 +1100224 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
225 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
226 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
228 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
Nathan Scotte50bd162006-04-11 15:10:45 +1000229 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000230 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return XFS_ERROR(EFSCORRUPTED);
232 }
233
234 /*
235 * Sanity check AG count, size fields against data size field
236 */
237 if (unlikely(
238 sbp->sb_dblocks == 0 ||
239 sbp->sb_dblocks >
240 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
241 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
242 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000243 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return XFS_ERROR(EFSCORRUPTED);
245 }
246
Lachlan McIlroy2edbddd2008-06-27 13:34:34 +1000247 /*
248 * Until this is fixed only page-sized or smaller data blocks work.
249 */
250 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
251 xfs_fs_mount_cmn_err(flags,
252 "file system with blocksize %d bytes",
253 sbp->sb_blocksize);
254 xfs_fs_mount_cmn_err(flags,
255 "only pagesize (%ld) or less will currently work.",
256 PAGE_SIZE);
257 return XFS_ERROR(ENOSYS);
258 }
259
Nathan Scott4cc929e2007-05-14 18:24:02 +1000260 if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
261 xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000262 xfs_fs_mount_cmn_err(flags,
263 "file system too large to be mounted on this system.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return XFS_ERROR(E2BIG);
265 }
266
267 if (unlikely(sbp->sb_inprogress)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000268 xfs_fs_mount_cmn_err(flags, "file system busy");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return XFS_ERROR(EFSCORRUPTED);
270 }
271
272 /*
Nathan Scottde206142005-05-05 13:24:13 -0700273 * Version 1 directory format has never worked on Linux.
274 */
Eric Sandeen62118702008-03-06 13:44:28 +1100275 if (unlikely(!xfs_sb_version_hasdirv2(sbp))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000276 xfs_fs_mount_cmn_err(flags,
277 "file system using version 1 directory format");
Nathan Scottde206142005-05-05 13:24:13 -0700278 return XFS_ERROR(ENOSYS);
279 }
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return 0;
282}
283
David Chinnerda353b02007-08-28 14:00:13 +1000284STATIC void
285xfs_initialize_perag_icache(
286 xfs_perag_t *pag)
287{
288 if (!pag->pag_ici_init) {
289 rwlock_init(&pag->pag_ici_lock);
290 INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
291 pag->pag_ici_init = 1;
292 }
293}
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295xfs_agnumber_t
Nathan Scottc11e2c32005-11-02 15:11:45 +1100296xfs_initialize_perag(
Nathan Scottc11e2c32005-11-02 15:11:45 +1100297 xfs_mount_t *mp,
298 xfs_agnumber_t agcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 xfs_agnumber_t index, max_metadata;
301 xfs_perag_t *pag;
302 xfs_agino_t agino;
303 xfs_ino_t ino;
304 xfs_sb_t *sbp = &mp->m_sb;
305 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
306
307 /* Check to see if the filesystem can overflow 32 bit inodes */
308 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
309 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
310
311 /* Clear the mount flag if no inode can overflow 32 bits
312 * on this filesystem, or if specifically requested..
313 */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000314 if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > max_inum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 mp->m_flags |= XFS_MOUNT_32BITINODES;
316 } else {
317 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
318 }
319
320 /* If we can overflow then setup the ag headers accordingly */
321 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
322 /* Calculate how much should be reserved for inodes to
323 * meet the max inode percentage.
324 */
325 if (mp->m_maxicount) {
326 __uint64_t icount;
327
328 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
329 do_div(icount, 100);
330 icount += sbp->sb_agblocks - 1;
Eric Sandeena749ee82005-11-02 15:13:42 +1100331 do_div(icount, sbp->sb_agblocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 max_metadata = icount;
333 } else {
334 max_metadata = agcount;
335 }
336 for (index = 0; index < agcount; index++) {
337 ino = XFS_AGINO_TO_INO(mp, index, agino);
338 if (ino > max_inum) {
339 index++;
340 break;
341 }
342
Nathan Scottc41564b2006-03-29 08:55:14 +1000343 /* This ag is preferred for inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 pag = &mp->m_perag[index];
345 pag->pagi_inodeok = 1;
346 if (index < max_metadata)
347 pag->pagf_metadata = 1;
David Chinnerda353b02007-08-28 14:00:13 +1000348 xfs_initialize_perag_icache(pag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 }
350 } else {
351 /* Setup default behavior for smaller filesystems */
352 for (index = 0; index < agcount; index++) {
353 pag = &mp->m_perag[index];
354 pag->pagi_inodeok = 1;
David Chinnerda353b02007-08-28 14:00:13 +1000355 xfs_initialize_perag_icache(pag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
357 }
358 return index;
359}
360
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000361void
362xfs_sb_from_disk(
363 xfs_sb_t *to,
364 xfs_dsb_t *from)
365{
366 to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
367 to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
368 to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
369 to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
370 to->sb_rextents = be64_to_cpu(from->sb_rextents);
371 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
372 to->sb_logstart = be64_to_cpu(from->sb_logstart);
373 to->sb_rootino = be64_to_cpu(from->sb_rootino);
374 to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
375 to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
376 to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
377 to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
378 to->sb_agcount = be32_to_cpu(from->sb_agcount);
379 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
380 to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
381 to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
382 to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
383 to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
384 to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
385 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
386 to->sb_blocklog = from->sb_blocklog;
387 to->sb_sectlog = from->sb_sectlog;
388 to->sb_inodelog = from->sb_inodelog;
389 to->sb_inopblog = from->sb_inopblog;
390 to->sb_agblklog = from->sb_agblklog;
391 to->sb_rextslog = from->sb_rextslog;
392 to->sb_inprogress = from->sb_inprogress;
393 to->sb_imax_pct = from->sb_imax_pct;
394 to->sb_icount = be64_to_cpu(from->sb_icount);
395 to->sb_ifree = be64_to_cpu(from->sb_ifree);
396 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
397 to->sb_frextents = be64_to_cpu(from->sb_frextents);
398 to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
399 to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
400 to->sb_qflags = be16_to_cpu(from->sb_qflags);
401 to->sb_flags = from->sb_flags;
402 to->sb_shared_vn = from->sb_shared_vn;
403 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
404 to->sb_unit = be32_to_cpu(from->sb_unit);
405 to->sb_width = be32_to_cpu(from->sb_width);
406 to->sb_dirblklog = from->sb_dirblklog;
407 to->sb_logsectlog = from->sb_logsectlog;
408 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
409 to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
410 to->sb_features2 = be32_to_cpu(from->sb_features2);
David Chinneree1c0902008-03-06 13:45:50 +1100411 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414/*
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000415 * Copy in core superblock to ondisk one.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 *
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000417 * The fields argument is mask of superblock fields to copy.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 */
419void
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000420xfs_sb_to_disk(
421 xfs_dsb_t *to,
422 xfs_sb_t *from,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 __int64_t fields)
424{
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000425 xfs_caddr_t to_ptr = (xfs_caddr_t)to;
426 xfs_caddr_t from_ptr = (xfs_caddr_t)from;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 xfs_sb_field_t f;
428 int first;
429 int size;
430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 ASSERT(fields);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 if (!fields)
433 return;
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 while (fields) {
436 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
437 first = xfs_sb_info[f].offset;
438 size = xfs_sb_info[f + 1].offset - first;
439
440 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
441
442 if (size == 1 || xfs_sb_info[f].type == 1) {
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000443 memcpy(to_ptr + first, from_ptr + first, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 } else {
445 switch (size) {
446 case 2:
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000447 *(__be16 *)(to_ptr + first) =
448 cpu_to_be16(*(__u16 *)(from_ptr + first));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 break;
450 case 4:
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000451 *(__be32 *)(to_ptr + first) =
452 cpu_to_be32(*(__u32 *)(from_ptr + first));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 break;
454 case 8:
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000455 *(__be64 *)(to_ptr + first) =
456 cpu_to_be64(*(__u64 *)(from_ptr + first));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 break;
458 default:
459 ASSERT(0);
460 }
461 }
462
463 fields &= ~(1LL << f);
464 }
465}
466
467/*
468 * xfs_readsb
469 *
470 * Does the initial read of the superblock.
471 */
472int
Nathan Scott764d1f82006-03-31 13:04:17 +1000473xfs_readsb(xfs_mount_t *mp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 unsigned int sector_size;
476 unsigned int extra_flags;
477 xfs_buf_t *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 int error;
479
480 ASSERT(mp->m_sb_bp == NULL);
481 ASSERT(mp->m_ddev_targp != NULL);
482
483 /*
484 * Allocate a (locked) buffer to hold the superblock.
485 * This will be kept around at all times to optimize
486 * access to the superblock.
487 */
488 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
489 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
490
491 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
492 BTOBB(sector_size), extra_flags);
493 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000494 xfs_fs_mount_cmn_err(flags, "SB read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
496 goto fail;
497 }
498 ASSERT(XFS_BUF_ISBUSY(bp));
499 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
500
501 /*
502 * Initialize the mount structure from the superblock.
503 * But first do some basic consistency checking.
504 */
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +1000505 xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Nathan Scott764d1f82006-03-31 13:04:17 +1000507 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 if (error) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000509 xfs_fs_mount_cmn_err(flags, "SB validate failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 goto fail;
511 }
512
513 /*
514 * We must be able to do sector-sized and sector-aligned IO.
515 */
516 if (sector_size > mp->m_sb.sb_sectsize) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000517 xfs_fs_mount_cmn_err(flags,
518 "device supports only %u byte sectors (not %u)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 sector_size, mp->m_sb.sb_sectsize);
520 error = ENOSYS;
521 goto fail;
522 }
523
524 /*
525 * If device sector size is smaller than the superblock size,
526 * re-read the superblock so the buffer is correctly sized.
527 */
528 if (sector_size < mp->m_sb.sb_sectsize) {
529 XFS_BUF_UNMANAGE(bp);
530 xfs_buf_relse(bp);
531 sector_size = mp->m_sb.sb_sectsize;
532 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
533 BTOBB(sector_size), extra_flags);
534 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000535 xfs_fs_mount_cmn_err(flags, "SB re-read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
537 goto fail;
538 }
539 ASSERT(XFS_BUF_ISBUSY(bp));
540 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
541 }
542
Lachlan McIlroy5478eea2007-02-10 18:36:29 +1100543 /* Initialize per-cpu counters */
544 xfs_icsb_reinit_counters(mp);
David Chinner8d280b92006-03-14 13:13:09 +1100545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 mp->m_sb_bp = bp;
547 xfs_buf_relse(bp);
548 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
549 return 0;
550
551 fail:
552 if (bp) {
553 XFS_BUF_UNMANAGE(bp);
554 xfs_buf_relse(bp);
555 }
556 return error;
557}
558
559
560/*
561 * xfs_mount_common
562 *
563 * Mount initialization code establishing various mount
564 * fields from the superblock associated with the given
565 * mount structure
566 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000567STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
569{
570 int i;
571
572 mp->m_agfrotor = mp->m_agirotor = 0;
Eric Sandeen007c61c2007-10-11 17:43:56 +1000573 spin_lock_init(&mp->m_agirotor_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 mp->m_maxagi = mp->m_sb.sb_agcount;
575 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
576 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
577 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
578 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
579 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
580 mp->m_litino = sbp->sb_inodesize -
581 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
582 mp->m_blockmask = sbp->sb_blocksize - 1;
583 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
584 mp->m_blockwmask = mp->m_blockwsize - 1;
585 INIT_LIST_HEAD(&mp->m_del_inodes);
586
587 /*
588 * Setup for attributes, in case they get created.
589 * This value is for inodes getting attributes for the first time,
590 * the per-inode value is for old attribute values.
591 */
592 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
593 switch (sbp->sb_inodesize) {
594 case 256:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100595 mp->m_attroffset = XFS_LITINO(mp) -
596 XFS_BMDR_SPACE_CALC(MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 break;
598 case 512:
599 case 1024:
600 case 2048:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100601 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 break;
603 default:
604 ASSERT(0);
605 }
606 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
607
608 for (i = 0; i < 2; i++) {
609 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
610 xfs_alloc, i == 0);
611 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
612 xfs_alloc, i == 0);
613 }
614 for (i = 0; i < 2; i++) {
615 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
616 xfs_bmbt, i == 0);
617 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
618 xfs_bmbt, i == 0);
619 }
620 for (i = 0; i < 2; i++) {
621 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
622 xfs_inobt, i == 0);
623 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
624 xfs_inobt, i == 0);
625 }
626
627 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
628 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
629 sbp->sb_inopblock);
630 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
631}
David Chinner92821e22007-05-24 15:26:31 +1000632
633/*
634 * xfs_initialize_perag_data
635 *
636 * Read in each per-ag structure so we can count up the number of
637 * allocated inodes, free inodes and used filesystem blocks as this
638 * information is no longer persistent in the superblock. Once we have
639 * this information, write it into the in-core superblock structure.
640 */
641STATIC int
642xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount)
643{
644 xfs_agnumber_t index;
645 xfs_perag_t *pag;
646 xfs_sb_t *sbp = &mp->m_sb;
647 uint64_t ifree = 0;
648 uint64_t ialloc = 0;
649 uint64_t bfree = 0;
650 uint64_t bfreelst = 0;
651 uint64_t btree = 0;
652 int error;
David Chinner92821e22007-05-24 15:26:31 +1000653
654 for (index = 0; index < agcount; index++) {
655 /*
656 * read the agf, then the agi. This gets us
657 * all the inforamtion we need and populates the
658 * per-ag structures for us.
659 */
660 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
661 if (error)
662 return error;
663
664 error = xfs_ialloc_pagi_init(mp, NULL, index);
665 if (error)
666 return error;
667 pag = &mp->m_perag[index];
668 ifree += pag->pagi_freecount;
669 ialloc += pag->pagi_count;
670 bfree += pag->pagf_freeblks;
671 bfreelst += pag->pagf_flcount;
672 btree += pag->pagf_btreeblks;
673 }
674 /*
675 * Overwrite incore superblock counters with just-read data
676 */
Eric Sandeen3685c2a2007-10-11 17:42:32 +1000677 spin_lock(&mp->m_sb_lock);
David Chinner92821e22007-05-24 15:26:31 +1000678 sbp->sb_ifree = ifree;
679 sbp->sb_icount = ialloc;
680 sbp->sb_fdblocks = bfree + bfreelst + btree;
Eric Sandeen3685c2a2007-10-11 17:42:32 +1000681 spin_unlock(&mp->m_sb_lock);
David Chinner92821e22007-05-24 15:26:31 +1000682
683 /* Fixup the per-cpu counters as well. */
684 xfs_icsb_reinit_counters(mp);
685
686 return 0;
687}
688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689/*
Eric Sandeen0771fb42007-10-12 11:03:40 +1000690 * Update alignment values based on mount options and sb values
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 */
Eric Sandeen0771fb42007-10-12 11:03:40 +1000692STATIC int
Christoph Hellwig42490232008-08-13 16:49:32 +1000693xfs_update_alignment(xfs_mount_t *mp, __uint64_t *update_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 xfs_sb_t *sbp = &(mp->m_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Christoph Hellwig42490232008-08-13 16:49:32 +1000697 if (mp->m_dalign) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 /*
699 * If stripe unit and stripe width are not multiples
700 * of the fs blocksize turn off alignment.
701 */
702 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
703 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
704 if (mp->m_flags & XFS_MOUNT_RETERR) {
705 cmn_err(CE_WARN,
706 "XFS: alignment check 1 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000707 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
709 mp->m_dalign = mp->m_swidth = 0;
710 } else {
711 /*
712 * Convert the stripe unit and width to FSBs.
713 */
714 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
715 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
716 if (mp->m_flags & XFS_MOUNT_RETERR) {
Eric Sandeen0771fb42007-10-12 11:03:40 +1000717 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 }
719 xfs_fs_cmn_err(CE_WARN, mp,
720"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
721 mp->m_dalign, mp->m_swidth,
722 sbp->sb_agblocks);
723
724 mp->m_dalign = 0;
725 mp->m_swidth = 0;
726 } else if (mp->m_dalign) {
727 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
728 } else {
729 if (mp->m_flags & XFS_MOUNT_RETERR) {
730 xfs_fs_cmn_err(CE_WARN, mp,
731"stripe alignment turned off: sunit(%d) less than bsize(%d)",
732 mp->m_dalign,
733 mp->m_blockmask +1);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000734 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 }
736 mp->m_swidth = 0;
737 }
738 }
739
740 /*
741 * Update superblock with new values
742 * and log changes
743 */
Eric Sandeen62118702008-03-06 13:44:28 +1100744 if (xfs_sb_version_hasdalign(sbp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 if (sbp->sb_unit != mp->m_dalign) {
746 sbp->sb_unit = mp->m_dalign;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000747 *update_flags |= XFS_SB_UNIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 }
749 if (sbp->sb_width != mp->m_swidth) {
750 sbp->sb_width = mp->m_swidth;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000751 *update_flags |= XFS_SB_WIDTH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
753 }
754 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
Eric Sandeen62118702008-03-06 13:44:28 +1100755 xfs_sb_version_hasdalign(&mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 mp->m_dalign = sbp->sb_unit;
757 mp->m_swidth = sbp->sb_width;
758 }
759
Eric Sandeen0771fb42007-10-12 11:03:40 +1000760 return 0;
761}
762
763/*
764 * Set the maximum inode count for this filesystem
765 */
766STATIC void
767xfs_set_maxicount(xfs_mount_t *mp)
768{
769 xfs_sb_t *sbp = &(mp->m_sb);
770 __uint64_t icount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 if (sbp->sb_imax_pct) {
Eric Sandeen0771fb42007-10-12 11:03:40 +1000773 /*
774 * Make sure the maximum inode count is a multiple
775 * of the units we allocate inodes in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
778 do_div(icount, 100);
779 do_div(icount, mp->m_ialloc_blks);
780 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
781 sbp->sb_inopblog;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000782 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 mp->m_maxicount = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 }
Eric Sandeen0771fb42007-10-12 11:03:40 +1000785}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Eric Sandeen0771fb42007-10-12 11:03:40 +1000787/*
788 * Set the default minimum read and write sizes unless
789 * already specified in a mount option.
790 * We use smaller I/O sizes when the file system
791 * is being used for NFS service (wsync mount option).
792 */
793STATIC void
794xfs_set_rw_sizes(xfs_mount_t *mp)
795{
796 xfs_sb_t *sbp = &(mp->m_sb);
797 int readio_log, writeio_log;
798
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
800 if (mp->m_flags & XFS_MOUNT_WSYNC) {
801 readio_log = XFS_WSYNC_READIO_LOG;
802 writeio_log = XFS_WSYNC_WRITEIO_LOG;
803 } else {
804 readio_log = XFS_READIO_LOG_LARGE;
805 writeio_log = XFS_WRITEIO_LOG_LARGE;
806 }
807 } else {
808 readio_log = mp->m_readio_log;
809 writeio_log = mp->m_writeio_log;
810 }
811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (sbp->sb_blocklog > readio_log) {
813 mp->m_readio_log = sbp->sb_blocklog;
814 } else {
815 mp->m_readio_log = readio_log;
816 }
817 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
818 if (sbp->sb_blocklog > writeio_log) {
819 mp->m_writeio_log = sbp->sb_blocklog;
820 } else {
821 mp->m_writeio_log = writeio_log;
822 }
823 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000824}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Eric Sandeen0771fb42007-10-12 11:03:40 +1000826/*
827 * Set whether we're using inode alignment.
828 */
829STATIC void
830xfs_set_inoalignment(xfs_mount_t *mp)
831{
Eric Sandeen62118702008-03-06 13:44:28 +1100832 if (xfs_sb_version_hasalign(&mp->m_sb) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 mp->m_sb.sb_inoalignmt >=
834 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
835 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
836 else
837 mp->m_inoalign_mask = 0;
838 /*
839 * If we are using stripe alignment, check whether
840 * the stripe unit is a multiple of the inode alignment
841 */
842 if (mp->m_dalign && mp->m_inoalign_mask &&
843 !(mp->m_dalign & mp->m_inoalign_mask))
844 mp->m_sinoalign = mp->m_dalign;
845 else
846 mp->m_sinoalign = 0;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000847}
848
849/*
850 * Check that the data (and log if separate) are an ok size.
851 */
852STATIC int
Christoph Hellwig42490232008-08-13 16:49:32 +1000853xfs_check_sizes(xfs_mount_t *mp)
Eric Sandeen0771fb42007-10-12 11:03:40 +1000854{
855 xfs_buf_t *bp;
856 xfs_daddr_t d;
857 int error;
858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
860 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
861 cmn_err(CE_WARN, "XFS: size check 1 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000862 return XFS_ERROR(E2BIG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 }
864 error = xfs_read_buf(mp, mp->m_ddev_targp,
865 d - XFS_FSS_TO_BB(mp, 1),
866 XFS_FSS_TO_BB(mp, 1), 0, &bp);
867 if (!error) {
868 xfs_buf_relse(bp);
869 } else {
870 cmn_err(CE_WARN, "XFS: size check 2 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000871 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 error = XFS_ERROR(E2BIG);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000873 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 }
875
Christoph Hellwig42490232008-08-13 16:49:32 +1000876 if (mp->m_logdev_targp != mp->m_ddev_targp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
878 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
879 cmn_err(CE_WARN, "XFS: size check 3 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000880 return XFS_ERROR(E2BIG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 }
882 error = xfs_read_buf(mp, mp->m_logdev_targp,
883 d - XFS_FSB_TO_BB(mp, 1),
884 XFS_FSB_TO_BB(mp, 1), 0, &bp);
885 if (!error) {
886 xfs_buf_relse(bp);
887 } else {
888 cmn_err(CE_WARN, "XFS: size check 3 failed");
Eric Sandeen0771fb42007-10-12 11:03:40 +1000889 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 error = XFS_ERROR(E2BIG);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000891 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893 }
Eric Sandeen0771fb42007-10-12 11:03:40 +1000894 return 0;
895}
896
897/*
898 * xfs_mountfs
899 *
900 * This function does the following on an initial mount of a file system:
901 * - reads the superblock from disk and init the mount struct
902 * - if we're a 32-bit kernel, do a size check on the superblock
903 * so we don't mount terabyte filesystems
904 * - init mount struct realtime fields
905 * - allocate inode hash table for fs
906 * - init directory manager
907 * - perform recovery and init the log manager
908 */
909int
910xfs_mountfs(
Christoph Hellwig42490232008-08-13 16:49:32 +1000911 xfs_mount_t *mp)
Eric Sandeen0771fb42007-10-12 11:03:40 +1000912{
913 xfs_sb_t *sbp = &(mp->m_sb);
914 xfs_inode_t *rip;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000915 __uint64_t resblks;
916 __int64_t update_flags = 0LL;
917 uint quotamount, quotaflags;
Eric Sandeen0771fb42007-10-12 11:03:40 +1000918 int uuid_mounted = 0;
919 int error = 0;
920
Eric Sandeen0771fb42007-10-12 11:03:40 +1000921 xfs_mount_common(mp, sbp);
922
923 /*
Eric Sandeene6957ea2008-04-10 12:19:34 +1000924 * Check for a mismatched features2 values. Older kernels
925 * read & wrote into the wrong sb offset for sb_features2
926 * on some platforms due to xfs_sb_t not being 64bit size aligned
927 * when sb_features2 was added, which made older superblock
928 * reading/writing routines swap it as a 64-bit value.
David Chinneree1c0902008-03-06 13:45:50 +1100929 *
Eric Sandeene6957ea2008-04-10 12:19:34 +1000930 * For backwards compatibility, we make both slots equal.
931 *
932 * If we detect a mismatched field, we OR the set bits into the
933 * existing features2 field in case it has already been modified; we
934 * don't want to lose any features. We then update the bad location
935 * with the ORed value so that older kernels will see any features2
936 * flags, and mark the two fields as needing updates once the
937 * transaction subsystem is online.
David Chinneree1c0902008-03-06 13:45:50 +1100938 */
Eric Sandeene6957ea2008-04-10 12:19:34 +1000939 if (xfs_sb_has_mismatched_features2(sbp)) {
David Chinneree1c0902008-03-06 13:45:50 +1100940 cmn_err(CE_WARN,
941 "XFS: correcting sb_features alignment problem");
942 sbp->sb_features2 |= sbp->sb_bad_features2;
Eric Sandeene6957ea2008-04-10 12:19:34 +1000943 sbp->sb_bad_features2 = sbp->sb_features2;
David Chinneree1c0902008-03-06 13:45:50 +1100944 update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2;
Eric Sandeene6957ea2008-04-10 12:19:34 +1000945
946 /*
947 * Re-check for ATTR2 in case it was found in bad_features2
948 * slot.
949 */
Tim Shimmin7c12f292008-04-30 18:15:28 +1000950 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
951 !(mp->m_flags & XFS_MOUNT_NOATTR2))
Eric Sandeene6957ea2008-04-10 12:19:34 +1000952 mp->m_flags |= XFS_MOUNT_ATTR2;
Tim Shimmin7c12f292008-04-30 18:15:28 +1000953 }
Eric Sandeene6957ea2008-04-10 12:19:34 +1000954
Tim Shimmin7c12f292008-04-30 18:15:28 +1000955 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
956 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
957 xfs_sb_version_removeattr2(&mp->m_sb);
958 update_flags |= XFS_SB_FEATURES2;
959
960 /* update sb_versionnum for the clearing of the morebits */
961 if (!sbp->sb_features2)
962 update_flags |= XFS_SB_VERSIONNUM;
David Chinneree1c0902008-03-06 13:45:50 +1100963 }
964
965 /*
Eric Sandeen0771fb42007-10-12 11:03:40 +1000966 * Check if sb_agblocks is aligned at stripe boundary
967 * If sb_agblocks is NOT aligned turn off m_dalign since
968 * allocator alignment is within an ag, therefore ag has
969 * to be aligned at stripe boundary.
970 */
Christoph Hellwig42490232008-08-13 16:49:32 +1000971 error = xfs_update_alignment(mp, &update_flags);
Eric Sandeen0771fb42007-10-12 11:03:40 +1000972 if (error)
973 goto error1;
974
975 xfs_alloc_compute_maxlevels(mp);
976 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
977 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
978 xfs_ialloc_compute_maxlevels(mp);
979
980 xfs_set_maxicount(mp);
981
982 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
983
984 /*
985 * XFS uses the uuid from the superblock as the unique
986 * identifier for fsid. We can not use the uuid from the volume
987 * since a single partition filesystem is identical to a single
988 * partition volume/filesystem.
989 */
Christoph Hellwig42490232008-08-13 16:49:32 +1000990 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
Eric Sandeen0771fb42007-10-12 11:03:40 +1000991 if (xfs_uuid_mount(mp)) {
992 error = XFS_ERROR(EINVAL);
993 goto error1;
994 }
995 uuid_mounted=1;
996 }
997
998 /*
999 * Set the minimum read and write sizes
1000 */
1001 xfs_set_rw_sizes(mp);
1002
1003 /*
1004 * Set the inode cluster size.
1005 * This may still be overridden by the file system
1006 * block size if it is larger than the chosen cluster size.
1007 */
1008 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
1009
1010 /*
1011 * Set inode alignment fields
1012 */
1013 xfs_set_inoalignment(mp);
1014
1015 /*
1016 * Check that the data (and log if separate) are an ok size.
1017 */
Christoph Hellwig42490232008-08-13 16:49:32 +10001018 error = xfs_check_sizes(mp);
Eric Sandeen0771fb42007-10-12 11:03:40 +10001019 if (error)
1020 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
1022 /*
1023 * Initialize realtime fields in the mount structure
1024 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001025 error = xfs_rtmount_init(mp);
1026 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 cmn_err(CE_WARN, "XFS: RT mount failed");
1028 goto error1;
1029 }
1030
1031 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 * Copies the low order bits of the timestamp and the randomly
1033 * set "sequence" number out of a UUID.
1034 */
1035 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
1036
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 mp->m_dmevmask = 0; /* not persistent; set after each mount */
1038
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10001039 xfs_dir_mount(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 /*
1042 * Initialize the attribute manager's entries.
1043 */
1044 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
1045
1046 /*
1047 * Initialize the precomputed transaction reservations values.
1048 */
1049 xfs_trans_init(mp);
1050
1051 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 * Allocate and initialize the per-ag data.
1053 */
1054 init_rwsem(&mp->m_peraglock);
Christoph Hellwigd62c2512008-08-13 16:51:29 +10001055 mp->m_perag = kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t),
1056 KM_MAYFAIL);
1057 if (!mp->m_perag)
1058 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Christoph Hellwigb267ce92007-08-30 17:21:30 +10001060 mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062 /*
1063 * log's mount-time initialization. Perform 1st part recovery if needed
1064 */
1065 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
1066 error = xfs_log_mount(mp, mp->m_logdev_targp,
1067 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
1068 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
1069 if (error) {
1070 cmn_err(CE_WARN, "XFS: log mount failed");
1071 goto error2;
1072 }
1073 } else { /* No log has been defined */
1074 cmn_err(CE_WARN, "XFS: no log defined");
1075 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
1076 error = XFS_ERROR(EFSCORRUPTED);
1077 goto error2;
1078 }
1079
1080 /*
David Chinner92821e22007-05-24 15:26:31 +10001081 * Now the log is mounted, we know if it was an unclean shutdown or
1082 * not. If it was, with the first phase of recovery has completed, we
1083 * have consistent AG blocks on disk. We have not recovered EFIs yet,
1084 * but they are recovered transactionally in the second recovery phase
1085 * later.
1086 *
1087 * Hence we can safely re-initialise incore superblock counters from
1088 * the per-ag data. These may not be correct if the filesystem was not
1089 * cleanly unmounted, so we need to wait for recovery to finish before
1090 * doing this.
1091 *
1092 * If the filesystem was cleanly unmounted, then we can trust the
1093 * values in the superblock to be correct and we don't need to do
1094 * anything here.
1095 *
1096 * If we are currently making the filesystem, the initialisation will
1097 * fail as the perag data is in an undefined state.
1098 */
1099
1100 if (xfs_sb_version_haslazysbcount(&mp->m_sb) &&
1101 !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) &&
1102 !mp->m_sb.sb_inprogress) {
1103 error = xfs_initialize_perag_data(mp, sbp->sb_agcount);
1104 if (error) {
1105 goto error2;
1106 }
1107 }
1108 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 * Get and sanity-check the root inode.
1110 * Save the pointer to it in the mount structure.
1111 */
1112 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
1113 if (error) {
1114 cmn_err(CE_WARN, "XFS: failed to read root inode");
1115 goto error3;
1116 }
1117
1118 ASSERT(rip != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
1120 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
1121 cmn_err(CE_WARN, "XFS: corrupted root inode");
Nathan Scottb6574522006-06-09 15:29:40 +10001122 cmn_err(CE_WARN, "Device %s - root %llu is not a directory",
1123 XFS_BUFTARG_NAME(mp->m_ddev_targp),
1124 (unsigned long long)rip->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1126 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
1127 mp);
1128 error = XFS_ERROR(EFSCORRUPTED);
1129 goto error4;
1130 }
1131 mp->m_rootip = rip; /* save it */
1132
1133 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1134
1135 /*
1136 * Initialize realtime inode pointers in the mount structure
1137 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001138 error = xfs_rtmount_inodes(mp);
1139 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 /*
1141 * Free up the root inode.
1142 */
1143 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1144 goto error4;
1145 }
1146
1147 /*
David Chinneree1c0902008-03-06 13:45:50 +11001148 * If fs is not mounted readonly, then update the superblock changes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 */
David Chinnere5720ee2008-04-10 12:21:18 +10001150 if (update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1151 error = xfs_mount_log_sb(mp, update_flags);
1152 if (error) {
1153 cmn_err(CE_WARN, "XFS: failed to write sb changes");
1154 goto error4;
1155 }
1156 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 /*
1159 * Initialise the XFS quota management subsystem for this mount
1160 */
Eric Sandeen0771fb42007-10-12 11:03:40 +10001161 error = XFS_QM_INIT(mp, &quotamount, &quotaflags);
1162 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 goto error4;
1164
1165 /*
1166 * Finish recovering the file system. This part needed to be
1167 * delayed until after the root and real-time bitmap inodes
1168 * were consistently read in.
1169 */
Christoph Hellwig42490232008-08-13 16:49:32 +10001170 error = xfs_log_mount_finish(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 if (error) {
1172 cmn_err(CE_WARN, "XFS: log mount finish failed");
1173 goto error4;
1174 }
1175
1176 /*
1177 * Complete the quota initialisation, post-log-replay component.
1178 */
Christoph Hellwig42490232008-08-13 16:49:32 +10001179 error = XFS_QM_MOUNT(mp, quotamount, quotaflags);
Eric Sandeen0771fb42007-10-12 11:03:40 +10001180 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 goto error4;
1182
David Chinner84e1e992007-06-18 16:50:27 +10001183 /*
1184 * Now we are mounted, reserve a small amount of unused space for
1185 * privileged transactions. This is needed so that transaction
1186 * space required for critical operations can dip into this pool
1187 * when at ENOSPC. This is needed for operations like create with
1188 * attr, unwritten extent conversion at ENOSPC, etc. Data allocations
1189 * are not allowed to use this reserved space.
1190 *
1191 * We default to 5% or 1024 fsbs of space reserved, whichever is smaller.
1192 * This may drive us straight to ENOSPC on mount, but that implies
David Chinner714082b2008-04-10 12:20:03 +10001193 * we were already there on the last unmount. Warn if this occurs.
David Chinner84e1e992007-06-18 16:50:27 +10001194 */
Christoph Hellwig39726be2007-06-18 17:57:45 +10001195 resblks = mp->m_sb.sb_dblocks;
1196 do_div(resblks, 20);
1197 resblks = min_t(__uint64_t, resblks, 1024);
David Chinner714082b2008-04-10 12:20:03 +10001198 error = xfs_reserve_blocks(mp, &resblks, NULL);
1199 if (error)
1200 cmn_err(CE_WARN, "XFS: Unable to allocate reserve blocks. "
1201 "Continuing without a reserve pool.");
David Chinner84e1e992007-06-18 16:50:27 +10001202
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 return 0;
1204
1205 error4:
1206 /*
1207 * Free up the root inode.
1208 */
Christoph Hellwig43355092008-03-27 18:01:08 +11001209 IRELE(rip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 error3:
1211 xfs_log_unmount_dealloc(mp);
1212 error2:
Christoph Hellwigff4f0382008-08-13 16:50:47 +10001213 xfs_free_perag(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 error1:
1215 if (uuid_mounted)
Christoph Hellwigfa6adbe2008-05-20 11:30:33 +10001216 uuid_table_remove(&mp->m_sb.sb_uuid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 return error;
1218}
1219
1220/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 * This flushes out the inodes,dquots and the superblock, unmounts the
1222 * log and makes sure that incore structures are freed.
1223 */
Christoph Hellwig41b5c2e2008-08-13 16:49:57 +10001224void
1225xfs_unmountfs(
1226 struct xfs_mount *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227{
Christoph Hellwig41b5c2e2008-08-13 16:49:57 +10001228 __uint64_t resblks;
1229 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
Christoph Hellwig77508ec2008-08-13 16:49:04 +10001231 IRELE(mp->m_rootip);
1232
David Chinner641c56f2007-06-18 16:50:17 +10001233 /*
1234 * We can potentially deadlock here if we have an inode cluster
1235 * that has been freed has it's buffer still pinned in memory because
1236 * the transaction is still sitting in a iclog. The stale inodes
1237 * on that buffer will have their flush locks held until the
1238 * transaction hits the disk and the callbacks run. the inode
1239 * flush takes the flush lock unconditionally and with nothing to
1240 * push out the iclog we will never get that unlocked. hence we
1241 * need to force the log first.
1242 */
1243 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
Christoph Hellwigefa80272005-06-21 15:37:17 +10001244 xfs_iflush_all(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245
Nathan Scottee2a4f72006-01-11 15:33:36 +11001246 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
1248 /*
1249 * Flush out the log synchronously so that we know for sure
1250 * that nothing is pinned. This is important because bflush()
1251 * will skip pinned buffers.
1252 */
1253 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1254
1255 xfs_binval(mp->m_ddev_targp);
1256 if (mp->m_rtdev_targp) {
1257 xfs_binval(mp->m_rtdev_targp);
1258 }
1259
David Chinner84e1e992007-06-18 16:50:27 +10001260 /*
1261 * Unreserve any blocks we have so that when we unmount we don't account
1262 * the reserved free space as used. This is really only necessary for
1263 * lazy superblock counting because it trusts the incore superblock
1264 * counters to be aboslutely correct on clean unmount.
1265 *
1266 * We don't bother correcting this elsewhere for lazy superblock
1267 * counting because on mount of an unclean filesystem we reconstruct the
1268 * correct counter value and this is irrelevant.
1269 *
1270 * For non-lazy counter filesystems, this doesn't matter at all because
1271 * we only every apply deltas to the superblock and hence the incore
1272 * value does not matter....
1273 */
1274 resblks = 0;
David Chinner714082b2008-04-10 12:20:03 +10001275 error = xfs_reserve_blocks(mp, &resblks, NULL);
1276 if (error)
1277 cmn_err(CE_WARN, "XFS: Unable to free reserved block pool. "
1278 "Freespace may not be correct on next mount.");
1279
David Chinnere5720ee2008-04-10 12:21:18 +10001280 error = xfs_log_sbcount(mp, 1);
1281 if (error)
1282 cmn_err(CE_WARN, "XFS: Unable to update superblock counters. "
1283 "Freespace may not be correct on next mount.");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 xfs_unmountfs_writesb(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 xfs_unmountfs_wait(mp); /* wait for async bufs */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 xfs_log_unmount(mp); /* Done! No more fs ops. */
1287
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 /*
1289 * All inodes from this mount point should be freed.
1290 */
1291 ASSERT(mp->m_inodes == NULL);
1292
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
Christoph Hellwigfa6adbe2008-05-20 11:30:33 +10001294 uuid_table_remove(&mp->m_sb.sb_uuid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295
Christoph Hellwig1550d0b2008-08-13 16:17:37 +10001296#if defined(DEBUG)
Christoph Hellwig0ce4cfd2007-08-30 17:20:53 +10001297 xfs_errortag_clearall(mp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298#endif
Christoph Hellwigff4f0382008-08-13 16:50:47 +10001299 xfs_free_perag(mp);
1300 if (mp->m_quotainfo)
1301 XFS_QM_DONE(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302}
1303
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001304STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305xfs_unmountfs_wait(xfs_mount_t *mp)
1306{
1307 if (mp->m_logdev_targp != mp->m_ddev_targp)
1308 xfs_wait_buftarg(mp->m_logdev_targp);
1309 if (mp->m_rtdev_targp)
1310 xfs_wait_buftarg(mp->m_rtdev_targp);
1311 xfs_wait_buftarg(mp->m_ddev_targp);
1312}
1313
1314int
David Chinner92821e22007-05-24 15:26:31 +10001315xfs_fs_writable(xfs_mount_t *mp)
1316{
Christoph Hellwigb267ce92007-08-30 17:21:30 +10001317 return !(xfs_test_for_freeze(mp) || XFS_FORCED_SHUTDOWN(mp) ||
Christoph Hellwigbd186aa2007-08-30 17:21:12 +10001318 (mp->m_flags & XFS_MOUNT_RDONLY));
David Chinner92821e22007-05-24 15:26:31 +10001319}
1320
1321/*
1322 * xfs_log_sbcount
1323 *
1324 * Called either periodically to keep the on disk superblock values
1325 * roughly up to date or from unmount to make sure the values are
1326 * correct on a clean unmount.
1327 *
1328 * Note this code can be called during the process of freezing, so
1329 * we may need to use the transaction allocator which does not not
1330 * block when the transaction subsystem is in its frozen state.
1331 */
1332int
1333xfs_log_sbcount(
1334 xfs_mount_t *mp,
1335 uint sync)
1336{
1337 xfs_trans_t *tp;
1338 int error;
1339
1340 if (!xfs_fs_writable(mp))
1341 return 0;
1342
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10001343 xfs_icsb_sync_counters(mp, 0);
David Chinner92821e22007-05-24 15:26:31 +10001344
1345 /*
1346 * we don't need to do this if we are updating the superblock
1347 * counters on every modification.
1348 */
1349 if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
1350 return 0;
1351
1352 tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT);
1353 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1354 XFS_DEFAULT_LOG_COUNT);
1355 if (error) {
1356 xfs_trans_cancel(tp, 0);
1357 return error;
1358 }
1359
1360 xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS);
1361 if (sync)
1362 xfs_trans_set_sync(tp);
David Chinnere5720ee2008-04-10 12:21:18 +10001363 error = xfs_trans_commit(tp, 0);
1364 return error;
David Chinner92821e22007-05-24 15:26:31 +10001365}
1366
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10001367STATIC void
1368xfs_mark_shared_ro(
1369 xfs_mount_t *mp,
1370 xfs_buf_t *bp)
1371{
1372 xfs_dsb_t *sb = XFS_BUF_TO_SBP(bp);
1373 __uint16_t version;
1374
1375 if (!(sb->sb_flags & XFS_SBF_READONLY))
1376 sb->sb_flags |= XFS_SBF_READONLY;
1377
1378 version = be16_to_cpu(sb->sb_versionnum);
1379 if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 ||
1380 !(version & XFS_SB_VERSION_SHAREDBIT))
1381 version |= XFS_SB_VERSION_SHAREDBIT;
1382 sb->sb_versionnum = cpu_to_be16(version);
1383}
1384
David Chinner92821e22007-05-24 15:26:31 +10001385int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386xfs_unmountfs_writesb(xfs_mount_t *mp)
1387{
1388 xfs_buf_t *sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 int error = 0;
1390
1391 /*
1392 * skip superblock write if fs is read-only, or
1393 * if we are doing a forced umount.
1394 */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +10001395 if (!((mp->m_flags & XFS_MOUNT_RDONLY) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 XFS_FORCED_SHUTDOWN(mp))) {
David Chinner8d280b92006-03-14 13:13:09 +11001397
David Chinner92821e22007-05-24 15:26:31 +10001398 sbp = xfs_getsb(mp, 0);
David Chinner8d280b92006-03-14 13:13:09 +11001399
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 /*
1401 * mark shared-readonly if desired
1402 */
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10001403 if (mp->m_mk_sharedro)
1404 xfs_mark_shared_ro(mp, sbp);
David Chinner92821e22007-05-24 15:26:31 +10001405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 XFS_BUF_UNDONE(sbp);
1407 XFS_BUF_UNREAD(sbp);
1408 XFS_BUF_UNDELAYWRITE(sbp);
1409 XFS_BUF_WRITE(sbp);
1410 XFS_BUF_UNASYNC(sbp);
1411 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1412 xfsbdstrat(mp, sbp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 error = xfs_iowait(sbp);
1414 if (error)
1415 xfs_ioerror_alert("xfs_unmountfs_writesb",
1416 mp, sbp, XFS_BUF_ADDR(sbp));
1417 if (error && mp->m_mk_sharedro)
1418 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 +10001419 xfs_buf_relse(sbp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001421 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422}
1423
1424/*
1425 * xfs_mod_sb() can be used to copy arbitrary changes to the
1426 * in-core superblock into the superblock buffer to be logged.
1427 * It does not provide the higher level of locking that is
1428 * needed to protect the in-core superblock from concurrent
1429 * access.
1430 */
1431void
1432xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1433{
1434 xfs_buf_t *bp;
1435 int first;
1436 int last;
1437 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 xfs_sb_field_t f;
1439
1440 ASSERT(fields);
1441 if (!fields)
1442 return;
1443 mp = tp->t_mountp;
1444 bp = xfs_trans_getsb(tp, mp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 first = sizeof(xfs_sb_t);
1446 last = 0;
1447
1448 /* translate/copy */
1449
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10001450 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
1452 /* find modified range */
1453
1454 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1455 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1456 first = xfs_sb_info[f].offset;
1457
1458 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1459 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1460 last = xfs_sb_info[f + 1].offset - 1;
1461
1462 xfs_trans_log_buf(tp, bp, first, last);
1463}
Yingping Lud210a282006-06-09 14:55:18 +10001464
Yingping Lud210a282006-06-09 14:55:18 +10001465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466/*
1467 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1468 * a delta to a specified field in the in-core superblock. Simply
1469 * switch on the field indicated and apply the delta to that field.
1470 * Fields are not allowed to dip below zero, so if the delta would
1471 * do this do not apply it and return EINVAL.
1472 *
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001473 * The m_sb_lock must be held when this routine is called.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 */
David Chinner8d280b92006-03-14 13:13:09 +11001475int
David Chinner20f4ebf2007-02-10 18:36:10 +11001476xfs_mod_incore_sb_unlocked(
1477 xfs_mount_t *mp,
1478 xfs_sb_field_t field,
1479 int64_t delta,
1480 int rsvd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481{
1482 int scounter; /* short counter for 32 bit fields */
1483 long long lcounter; /* long counter for 64 bit fields */
1484 long long res_used, rem;
1485
1486 /*
1487 * With the in-core superblock spin lock held, switch
1488 * on the indicated field. Apply the delta to the
1489 * proper field. If the fields value would dip below
1490 * 0, then do not apply the delta and return EINVAL.
1491 */
1492 switch (field) {
1493 case XFS_SBS_ICOUNT:
1494 lcounter = (long long)mp->m_sb.sb_icount;
1495 lcounter += delta;
1496 if (lcounter < 0) {
1497 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001498 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 }
1500 mp->m_sb.sb_icount = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001501 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 case XFS_SBS_IFREE:
1503 lcounter = (long long)mp->m_sb.sb_ifree;
1504 lcounter += delta;
1505 if (lcounter < 0) {
1506 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001507 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 }
1509 mp->m_sb.sb_ifree = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001510 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 case XFS_SBS_FDBLOCKS:
David Chinner4be536d2006-09-07 14:26:50 +10001512 lcounter = (long long)
1513 mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1515
1516 if (delta > 0) { /* Putting blocks back */
1517 if (res_used > delta) {
1518 mp->m_resblks_avail += delta;
1519 } else {
1520 rem = delta - res_used;
1521 mp->m_resblks_avail = mp->m_resblks;
1522 lcounter += rem;
1523 }
1524 } else { /* Taking blocks away */
1525
1526 lcounter += delta;
1527
1528 /*
1529 * If were out of blocks, use any available reserved blocks if
1530 * were allowed to.
1531 */
1532
1533 if (lcounter < 0) {
1534 if (rsvd) {
1535 lcounter = (long long)mp->m_resblks_avail + delta;
1536 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001537 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 }
1539 mp->m_resblks_avail = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001540 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 } else { /* not reserved */
Jesper Juhl014c2542006-01-15 02:37:08 +01001542 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 }
1544 }
1545 }
1546
David Chinner4be536d2006-09-07 14:26:50 +10001547 mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001548 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 case XFS_SBS_FREXTENTS:
1550 lcounter = (long long)mp->m_sb.sb_frextents;
1551 lcounter += delta;
1552 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001553 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 }
1555 mp->m_sb.sb_frextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 case XFS_SBS_DBLOCKS:
1558 lcounter = (long long)mp->m_sb.sb_dblocks;
1559 lcounter += delta;
1560 if (lcounter < 0) {
1561 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001562 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 }
1564 mp->m_sb.sb_dblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001565 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 case XFS_SBS_AGCOUNT:
1567 scounter = mp->m_sb.sb_agcount;
1568 scounter += delta;
1569 if (scounter < 0) {
1570 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001571 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 }
1573 mp->m_sb.sb_agcount = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001574 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 case XFS_SBS_IMAX_PCT:
1576 scounter = mp->m_sb.sb_imax_pct;
1577 scounter += delta;
1578 if (scounter < 0) {
1579 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001580 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 }
1582 mp->m_sb.sb_imax_pct = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001583 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 case XFS_SBS_REXTSIZE:
1585 scounter = mp->m_sb.sb_rextsize;
1586 scounter += delta;
1587 if (scounter < 0) {
1588 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001589 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 }
1591 mp->m_sb.sb_rextsize = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001592 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 case XFS_SBS_RBMBLOCKS:
1594 scounter = mp->m_sb.sb_rbmblocks;
1595 scounter += delta;
1596 if (scounter < 0) {
1597 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001598 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 }
1600 mp->m_sb.sb_rbmblocks = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001601 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 case XFS_SBS_RBLOCKS:
1603 lcounter = (long long)mp->m_sb.sb_rblocks;
1604 lcounter += delta;
1605 if (lcounter < 0) {
1606 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001607 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 }
1609 mp->m_sb.sb_rblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001610 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 case XFS_SBS_REXTENTS:
1612 lcounter = (long long)mp->m_sb.sb_rextents;
1613 lcounter += delta;
1614 if (lcounter < 0) {
1615 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001616 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 }
1618 mp->m_sb.sb_rextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001619 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 case XFS_SBS_REXTSLOG:
1621 scounter = mp->m_sb.sb_rextslog;
1622 scounter += delta;
1623 if (scounter < 0) {
1624 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001625 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 }
1627 mp->m_sb.sb_rextslog = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001628 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 default:
1630 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001631 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 }
1633}
1634
1635/*
1636 * xfs_mod_incore_sb() is used to change a field in the in-core
1637 * superblock structure by the specified delta. This modification
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001638 * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 * routine to do the work.
1640 */
1641int
David Chinner20f4ebf2007-02-10 18:36:10 +11001642xfs_mod_incore_sb(
1643 xfs_mount_t *mp,
1644 xfs_sb_field_t field,
1645 int64_t delta,
1646 int rsvd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 int status;
1649
David Chinner8d280b92006-03-14 13:13:09 +11001650 /* check for per-cpu counters */
1651 switch (field) {
1652#ifdef HAVE_PERCPU_SB
1653 case XFS_SBS_ICOUNT:
1654 case XFS_SBS_IFREE:
1655 case XFS_SBS_FDBLOCKS:
1656 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1657 status = xfs_icsb_modify_counters(mp, field,
1658 delta, rsvd);
1659 break;
1660 }
1661 /* FALLTHROUGH */
1662#endif
1663 default:
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001664 spin_lock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001665 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001666 spin_unlock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001667 break;
1668 }
1669
Jesper Juhl014c2542006-01-15 02:37:08 +01001670 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671}
1672
1673/*
1674 * xfs_mod_incore_sb_batch() is used to change more than one field
1675 * in the in-core superblock structure at a time. This modification
1676 * is protected by a lock internal to this module. The fields and
1677 * changes to those fields are specified in the array of xfs_mod_sb
1678 * structures passed in.
1679 *
1680 * Either all of the specified deltas will be applied or none of
1681 * them will. If any modified field dips below 0, then all modifications
1682 * will be backed out and EINVAL will be returned.
1683 */
1684int
1685xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1686{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 int status=0;
1688 xfs_mod_sb_t *msbp;
1689
1690 /*
1691 * Loop through the array of mod structures and apply each
1692 * individually. If any fail, then back out all those
1693 * which have already been applied. Do all of this within
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001694 * the scope of the m_sb_lock so that all of the changes will
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 * be atomic.
1696 */
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001697 spin_lock(&mp->m_sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 msbp = &msb[0];
1699 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1700 /*
1701 * Apply the delta at index n. If it fails, break
1702 * from the loop so we'll fall into the undo loop
1703 * below.
1704 */
David Chinner8d280b92006-03-14 13:13:09 +11001705 switch (msbp->msb_field) {
1706#ifdef HAVE_PERCPU_SB
1707 case XFS_SBS_ICOUNT:
1708 case XFS_SBS_IFREE:
1709 case XFS_SBS_FDBLOCKS:
1710 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001711 spin_unlock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11001712 status = xfs_icsb_modify_counters(mp,
David Chinner8d280b92006-03-14 13:13:09 +11001713 msbp->msb_field,
1714 msbp->msb_delta, rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001715 spin_lock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001716 break;
1717 }
1718 /* FALLTHROUGH */
1719#endif
1720 default:
1721 status = xfs_mod_incore_sb_unlocked(mp,
1722 msbp->msb_field,
1723 msbp->msb_delta, rsvd);
1724 break;
1725 }
1726
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 if (status != 0) {
1728 break;
1729 }
1730 }
1731
1732 /*
1733 * If we didn't complete the loop above, then back out
1734 * any changes made to the superblock. If you add code
1735 * between the loop above and here, make sure that you
1736 * preserve the value of status. Loop back until
1737 * we step below the beginning of the array. Make sure
1738 * we don't touch anything back there.
1739 */
1740 if (status != 0) {
1741 msbp--;
1742 while (msbp >= msb) {
David Chinner8d280b92006-03-14 13:13:09 +11001743 switch (msbp->msb_field) {
1744#ifdef HAVE_PERCPU_SB
1745 case XFS_SBS_ICOUNT:
1746 case XFS_SBS_IFREE:
1747 case XFS_SBS_FDBLOCKS:
1748 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001749 spin_unlock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11001750 status = xfs_icsb_modify_counters(mp,
David Chinner8d280b92006-03-14 13:13:09 +11001751 msbp->msb_field,
1752 -(msbp->msb_delta),
1753 rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001754 spin_lock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11001755 break;
1756 }
1757 /* FALLTHROUGH */
1758#endif
1759 default:
1760 status = xfs_mod_incore_sb_unlocked(mp,
1761 msbp->msb_field,
1762 -(msbp->msb_delta),
1763 rsvd);
1764 break;
1765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 ASSERT(status == 0);
1767 msbp--;
1768 }
1769 }
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001770 spin_unlock(&mp->m_sb_lock);
Jesper Juhl014c2542006-01-15 02:37:08 +01001771 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772}
1773
1774/*
1775 * xfs_getsb() is called to obtain the buffer for the superblock.
1776 * The buffer is returned locked and read in from disk.
1777 * The buffer should be released with a call to xfs_brelse().
1778 *
1779 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1780 * the superblock buffer if it can be locked without sleeping.
1781 * If it can't then we'll return NULL.
1782 */
1783xfs_buf_t *
1784xfs_getsb(
1785 xfs_mount_t *mp,
1786 int flags)
1787{
1788 xfs_buf_t *bp;
1789
1790 ASSERT(mp->m_sb_bp != NULL);
1791 bp = mp->m_sb_bp;
1792 if (flags & XFS_BUF_TRYLOCK) {
1793 if (!XFS_BUF_CPSEMA(bp)) {
1794 return NULL;
1795 }
1796 } else {
1797 XFS_BUF_PSEMA(bp, PRIBIO);
1798 }
1799 XFS_BUF_HOLD(bp);
1800 ASSERT(XFS_BUF_ISDONE(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001801 return bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802}
1803
1804/*
1805 * Used to free the superblock along various error paths.
1806 */
1807void
1808xfs_freesb(
1809 xfs_mount_t *mp)
1810{
1811 xfs_buf_t *bp;
1812
1813 /*
1814 * Use xfs_getsb() so that the buffer will be locked
1815 * when we call xfs_buf_relse().
1816 */
1817 bp = xfs_getsb(mp, 0);
1818 XFS_BUF_UNMANAGE(bp);
1819 xfs_buf_relse(bp);
1820 mp->m_sb_bp = NULL;
1821}
1822
1823/*
1824 * See if the UUID is unique among mounted XFS filesystems.
1825 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1826 */
1827STATIC int
1828xfs_uuid_mount(
1829 xfs_mount_t *mp)
1830{
1831 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1832 cmn_err(CE_WARN,
1833 "XFS: Filesystem %s has nil UUID - can't mount",
1834 mp->m_fsname);
1835 return -1;
1836 }
1837 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1838 cmn_err(CE_WARN,
1839 "XFS: Filesystem %s has duplicate UUID - can't mount",
1840 mp->m_fsname);
1841 return -1;
1842 }
1843 return 0;
1844}
1845
1846/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 * Used to log changes to the superblock unit and width fields which could
Eric Sandeene6957ea2008-04-10 12:19:34 +10001848 * be altered by the mount options, as well as any potential sb_features2
1849 * fixup. Only the first superblock is updated.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 */
David Chinnere5720ee2008-04-10 12:21:18 +10001851STATIC int
David Chinneree1c0902008-03-06 13:45:50 +11001852xfs_mount_log_sb(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 xfs_mount_t *mp,
1854 __int64_t fields)
1855{
1856 xfs_trans_t *tp;
David Chinnere5720ee2008-04-10 12:21:18 +10001857 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858
David Chinneree1c0902008-03-06 13:45:50 +11001859 ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID |
David Chinner4b166de2008-05-20 11:30:27 +10001860 XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 |
1861 XFS_SB_VERSIONNUM));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
1863 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
David Chinnere5720ee2008-04-10 12:21:18 +10001864 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1865 XFS_DEFAULT_LOG_COUNT);
1866 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 xfs_trans_cancel(tp, 0);
David Chinnere5720ee2008-04-10 12:21:18 +10001868 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 }
1870 xfs_mod_sb(tp, fields);
David Chinnere5720ee2008-04-10 12:21:18 +10001871 error = xfs_trans_commit(tp, 0);
1872 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873}
David Chinner8d280b92006-03-14 13:13:09 +11001874
1875
1876#ifdef HAVE_PERCPU_SB
1877/*
1878 * Per-cpu incore superblock counters
1879 *
1880 * Simple concept, difficult implementation
1881 *
1882 * Basically, replace the incore superblock counters with a distributed per cpu
1883 * counter for contended fields (e.g. free block count).
1884 *
1885 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1886 * hence needs to be accurately read when we are running low on space. Hence
1887 * there is a method to enable and disable the per-cpu counters based on how
1888 * much "stuff" is available in them.
1889 *
1890 * Basically, a counter is enabled if there is enough free resource to justify
1891 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1892 * ENOSPC), then we disable the counters to synchronise all callers and
1893 * re-distribute the available resources.
1894 *
1895 * If, once we redistributed the available resources, we still get a failure,
1896 * we disable the per-cpu counter and go through the slow path.
1897 *
1898 * The slow path is the current xfs_mod_incore_sb() function. This means that
1899 * when we disable a per-cpu counter, we need to drain it's resources back to
1900 * the global superblock. We do this after disabling the counter to prevent
1901 * more threads from queueing up on the counter.
1902 *
1903 * Essentially, this means that we still need a lock in the fast path to enable
1904 * synchronisation between the global counters and the per-cpu counters. This
1905 * is not a problem because the lock will be local to a CPU almost all the time
1906 * and have little contention except when we get to ENOSPC conditions.
1907 *
1908 * Basically, this lock becomes a barrier that enables us to lock out the fast
1909 * path while we do things like enabling and disabling counters and
1910 * synchronising the counters.
1911 *
1912 * Locking rules:
1913 *
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001914 * 1. m_sb_lock before picking up per-cpu locks
David Chinner8d280b92006-03-14 13:13:09 +11001915 * 2. per-cpu locks always picked up via for_each_online_cpu() order
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001916 * 3. accurate counter sync requires m_sb_lock + per cpu locks
David Chinner8d280b92006-03-14 13:13:09 +11001917 * 4. modifying per-cpu counters requires holding per-cpu lock
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001918 * 5. modifying global counters requires holding m_sb_lock
1919 * 6. enabling or disabling a counter requires holding the m_sb_lock
David Chinner8d280b92006-03-14 13:13:09 +11001920 * and _none_ of the per-cpu locks.
1921 *
1922 * Disabled counters are only ever re-enabled by a balance operation
1923 * that results in more free resources per CPU than a given threshold.
1924 * To ensure counters don't remain disabled, they are rebalanced when
1925 * the global resource goes above a higher threshold (i.e. some hysteresis
1926 * is present to prevent thrashing).
David Chinner8d280b92006-03-14 13:13:09 +11001927 */
David Chinnere8234a62006-03-14 13:23:52 +11001928
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001929#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11001930/*
1931 * hot-plug CPU notifier support.
1932 *
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001933 * We need a notifier per filesystem as we need to be able to identify
1934 * the filesystem to balance the counters out. This is achieved by
1935 * having a notifier block embedded in the xfs_mount_t and doing pointer
1936 * magic to get the mount pointer from the notifier block address.
David Chinnere8234a62006-03-14 13:23:52 +11001937 */
1938STATIC int
1939xfs_icsb_cpu_notify(
1940 struct notifier_block *nfb,
1941 unsigned long action,
1942 void *hcpu)
1943{
1944 xfs_icsb_cnts_t *cntp;
1945 xfs_mount_t *mp;
David Chinnere8234a62006-03-14 13:23:52 +11001946
1947 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
1948 cntp = (xfs_icsb_cnts_t *)
1949 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
1950 switch (action) {
1951 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07001952 case CPU_UP_PREPARE_FROZEN:
David Chinnere8234a62006-03-14 13:23:52 +11001953 /* Easy Case - initialize the area and locks, and
1954 * then rebalance when online does everything else for us. */
David Chinner01e1b692006-03-14 13:29:16 +11001955 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001956 break;
1957 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07001958 case CPU_ONLINE_FROZEN:
David Chinner03135cf2007-02-10 18:35:15 +11001959 xfs_icsb_lock(mp);
Christoph Hellwig45af6c62008-04-22 17:34:44 +10001960 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
1961 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
1962 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
David Chinner03135cf2007-02-10 18:35:15 +11001963 xfs_icsb_unlock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11001964 break;
1965 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -07001966 case CPU_DEAD_FROZEN:
David Chinnere8234a62006-03-14 13:23:52 +11001967 /* Disable all the counters, then fold the dead cpu's
1968 * count into the total on the global superblock and
1969 * re-enable the counters. */
David Chinner03135cf2007-02-10 18:35:15 +11001970 xfs_icsb_lock(mp);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001971 spin_lock(&mp->m_sb_lock);
David Chinnere8234a62006-03-14 13:23:52 +11001972 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
1973 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
1974 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
1975
1976 mp->m_sb.sb_icount += cntp->icsb_icount;
1977 mp->m_sb.sb_ifree += cntp->icsb_ifree;
1978 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
1979
David Chinner01e1b692006-03-14 13:29:16 +11001980 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001981
Christoph Hellwig45af6c62008-04-22 17:34:44 +10001982 xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0);
1983 xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0);
1984 xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10001985 spin_unlock(&mp->m_sb_lock);
David Chinner03135cf2007-02-10 18:35:15 +11001986 xfs_icsb_unlock(mp);
David Chinnere8234a62006-03-14 13:23:52 +11001987 break;
1988 }
1989
1990 return NOTIFY_OK;
1991}
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07001992#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11001993
David Chinner8d280b92006-03-14 13:13:09 +11001994int
1995xfs_icsb_init_counters(
1996 xfs_mount_t *mp)
1997{
1998 xfs_icsb_cnts_t *cntp;
1999 int i;
2000
2001 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
2002 if (mp->m_sb_cnts == NULL)
2003 return -ENOMEM;
2004
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002005#ifdef CONFIG_HOTPLUG_CPU
David Chinnere8234a62006-03-14 13:23:52 +11002006 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
2007 mp->m_icsb_notifier.priority = 0;
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002008 register_hotcpu_notifier(&mp->m_icsb_notifier);
2009#endif /* CONFIG_HOTPLUG_CPU */
David Chinnere8234a62006-03-14 13:23:52 +11002010
David Chinner8d280b92006-03-14 13:13:09 +11002011 for_each_online_cpu(i) {
2012 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11002013 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinner8d280b92006-03-14 13:13:09 +11002014 }
David Chinner20b64282007-02-10 18:35:09 +11002015
2016 mutex_init(&mp->m_icsb_mutex);
2017
David Chinner8d280b92006-03-14 13:13:09 +11002018 /*
2019 * start with all counters disabled so that the
2020 * initial balance kicks us off correctly
2021 */
2022 mp->m_icsb_counters = -1;
2023 return 0;
2024}
2025
Lachlan McIlroy5478eea2007-02-10 18:36:29 +11002026void
2027xfs_icsb_reinit_counters(
2028 xfs_mount_t *mp)
2029{
2030 xfs_icsb_lock(mp);
2031 /*
2032 * start with all counters disabled so that the
2033 * initial balance kicks us off correctly
2034 */
2035 mp->m_icsb_counters = -1;
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002036 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
2037 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
2038 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
Lachlan McIlroy5478eea2007-02-10 18:36:29 +11002039 xfs_icsb_unlock(mp);
2040}
2041
Christoph Hellwigc962fb72008-05-20 15:10:52 +10002042void
David Chinner8d280b92006-03-14 13:13:09 +11002043xfs_icsb_destroy_counters(
2044 xfs_mount_t *mp)
2045{
David Chinnere8234a62006-03-14 13:23:52 +11002046 if (mp->m_sb_cnts) {
Chandra Seetharaman5a67e4c2006-06-27 02:54:11 -07002047 unregister_hotcpu_notifier(&mp->m_icsb_notifier);
David Chinner8d280b92006-03-14 13:13:09 +11002048 free_percpu(mp->m_sb_cnts);
David Chinnere8234a62006-03-14 13:23:52 +11002049 }
David Chinner03135cf2007-02-10 18:35:15 +11002050 mutex_destroy(&mp->m_icsb_mutex);
David Chinner8d280b92006-03-14 13:13:09 +11002051}
2052
David Chinner7989cb82007-02-10 18:34:56 +11002053STATIC_INLINE void
David Chinner01e1b692006-03-14 13:29:16 +11002054xfs_icsb_lock_cntr(
2055 xfs_icsb_cnts_t *icsbp)
2056{
2057 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
2058 ndelay(1000);
2059 }
2060}
2061
David Chinner7989cb82007-02-10 18:34:56 +11002062STATIC_INLINE void
David Chinner01e1b692006-03-14 13:29:16 +11002063xfs_icsb_unlock_cntr(
2064 xfs_icsb_cnts_t *icsbp)
2065{
2066 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
2067}
2068
David Chinner8d280b92006-03-14 13:13:09 +11002069
David Chinner7989cb82007-02-10 18:34:56 +11002070STATIC_INLINE void
David Chinner8d280b92006-03-14 13:13:09 +11002071xfs_icsb_lock_all_counters(
2072 xfs_mount_t *mp)
2073{
2074 xfs_icsb_cnts_t *cntp;
2075 int i;
2076
2077 for_each_online_cpu(i) {
2078 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11002079 xfs_icsb_lock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11002080 }
2081}
2082
David Chinner7989cb82007-02-10 18:34:56 +11002083STATIC_INLINE void
David Chinner8d280b92006-03-14 13:13:09 +11002084xfs_icsb_unlock_all_counters(
2085 xfs_mount_t *mp)
2086{
2087 xfs_icsb_cnts_t *cntp;
2088 int i;
2089
2090 for_each_online_cpu(i) {
2091 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11002092 xfs_icsb_unlock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11002093 }
2094}
2095
2096STATIC void
2097xfs_icsb_count(
2098 xfs_mount_t *mp,
2099 xfs_icsb_cnts_t *cnt,
2100 int flags)
2101{
2102 xfs_icsb_cnts_t *cntp;
2103 int i;
2104
2105 memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
2106
2107 if (!(flags & XFS_ICSB_LAZY_COUNT))
2108 xfs_icsb_lock_all_counters(mp);
2109
2110 for_each_online_cpu(i) {
2111 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
2112 cnt->icsb_icount += cntp->icsb_icount;
2113 cnt->icsb_ifree += cntp->icsb_ifree;
2114 cnt->icsb_fdblocks += cntp->icsb_fdblocks;
2115 }
2116
2117 if (!(flags & XFS_ICSB_LAZY_COUNT))
2118 xfs_icsb_unlock_all_counters(mp);
2119}
2120
2121STATIC int
2122xfs_icsb_counter_disabled(
2123 xfs_mount_t *mp,
2124 xfs_sb_field_t field)
2125{
2126 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
2127 return test_bit(field, &mp->m_icsb_counters);
2128}
2129
David Chinner36fbe6e2008-04-10 12:19:56 +10002130STATIC void
David Chinner8d280b92006-03-14 13:13:09 +11002131xfs_icsb_disable_counter(
2132 xfs_mount_t *mp,
2133 xfs_sb_field_t field)
2134{
2135 xfs_icsb_cnts_t cnt;
2136
2137 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
2138
David Chinner20b64282007-02-10 18:35:09 +11002139 /*
2140 * If we are already disabled, then there is nothing to do
2141 * here. We check before locking all the counters to avoid
2142 * the expensive lock operation when being called in the
2143 * slow path and the counter is already disabled. This is
2144 * safe because the only time we set or clear this state is under
2145 * the m_icsb_mutex.
2146 */
2147 if (xfs_icsb_counter_disabled(mp, field))
David Chinner36fbe6e2008-04-10 12:19:56 +10002148 return;
David Chinner20b64282007-02-10 18:35:09 +11002149
David Chinner8d280b92006-03-14 13:13:09 +11002150 xfs_icsb_lock_all_counters(mp);
2151 if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
2152 /* drain back to superblock */
2153
Christoph Hellwigce461932008-04-22 17:34:50 +10002154 xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT);
David Chinner8d280b92006-03-14 13:13:09 +11002155 switch(field) {
2156 case XFS_SBS_ICOUNT:
2157 mp->m_sb.sb_icount = cnt.icsb_icount;
2158 break;
2159 case XFS_SBS_IFREE:
2160 mp->m_sb.sb_ifree = cnt.icsb_ifree;
2161 break;
2162 case XFS_SBS_FDBLOCKS:
2163 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
2164 break;
2165 default:
2166 BUG();
2167 }
2168 }
2169
2170 xfs_icsb_unlock_all_counters(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002171}
2172
2173STATIC void
2174xfs_icsb_enable_counter(
2175 xfs_mount_t *mp,
2176 xfs_sb_field_t field,
2177 uint64_t count,
2178 uint64_t resid)
2179{
2180 xfs_icsb_cnts_t *cntp;
2181 int i;
2182
2183 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
2184
2185 xfs_icsb_lock_all_counters(mp);
2186 for_each_online_cpu(i) {
2187 cntp = per_cpu_ptr(mp->m_sb_cnts, i);
2188 switch (field) {
2189 case XFS_SBS_ICOUNT:
2190 cntp->icsb_icount = count + resid;
2191 break;
2192 case XFS_SBS_IFREE:
2193 cntp->icsb_ifree = count + resid;
2194 break;
2195 case XFS_SBS_FDBLOCKS:
2196 cntp->icsb_fdblocks = count + resid;
2197 break;
2198 default:
2199 BUG();
2200 break;
2201 }
2202 resid = 0;
2203 }
2204 clear_bit(field, &mp->m_icsb_counters);
2205 xfs_icsb_unlock_all_counters(mp);
2206}
2207
David Chinnerdbcabad2007-02-10 18:36:17 +11002208void
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002209xfs_icsb_sync_counters_locked(
David Chinner8d280b92006-03-14 13:13:09 +11002210 xfs_mount_t *mp,
2211 int flags)
2212{
2213 xfs_icsb_cnts_t cnt;
David Chinner8d280b92006-03-14 13:13:09 +11002214
David Chinner8d280b92006-03-14 13:13:09 +11002215 xfs_icsb_count(mp, &cnt, flags);
2216
David Chinner8d280b92006-03-14 13:13:09 +11002217 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
2218 mp->m_sb.sb_icount = cnt.icsb_icount;
2219 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
2220 mp->m_sb.sb_ifree = cnt.icsb_ifree;
2221 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
2222 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
David Chinner8d280b92006-03-14 13:13:09 +11002223}
2224
2225/*
2226 * Accurate update of per-cpu counters to incore superblock
2227 */
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002228void
David Chinner8d280b92006-03-14 13:13:09 +11002229xfs_icsb_sync_counters(
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002230 xfs_mount_t *mp,
2231 int flags)
David Chinner8d280b92006-03-14 13:13:09 +11002232{
Christoph Hellwigd4d90b52008-04-22 17:34:37 +10002233 spin_lock(&mp->m_sb_lock);
2234 xfs_icsb_sync_counters_locked(mp, flags);
2235 spin_unlock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11002236}
2237
2238/*
2239 * Balance and enable/disable counters as necessary.
2240 *
David Chinner20b64282007-02-10 18:35:09 +11002241 * Thresholds for re-enabling counters are somewhat magic. inode counts are
2242 * chosen to be the same number as single on disk allocation chunk per CPU, and
2243 * free blocks is something far enough zero that we aren't going thrash when we
2244 * get near ENOSPC. We also need to supply a minimum we require per cpu to
2245 * prevent looping endlessly when xfs_alloc_space asks for more than will
2246 * be distributed to a single CPU but each CPU has enough blocks to be
2247 * reenabled.
2248 *
2249 * Note that we can be called when counters are already disabled.
2250 * xfs_icsb_disable_counter() optimises the counter locking in this case to
2251 * prevent locking every per-cpu counter needlessly.
David Chinner8d280b92006-03-14 13:13:09 +11002252 */
David Chinner20b64282007-02-10 18:35:09 +11002253
2254#define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64
David Chinner4be536d2006-09-07 14:26:50 +10002255#define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \
David Chinner20b64282007-02-10 18:35:09 +11002256 (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp))
David Chinner8d280b92006-03-14 13:13:09 +11002257STATIC void
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002258xfs_icsb_balance_counter_locked(
David Chinner8d280b92006-03-14 13:13:09 +11002259 xfs_mount_t *mp,
2260 xfs_sb_field_t field,
David Chinner20b64282007-02-10 18:35:09 +11002261 int min_per_cpu)
David Chinner8d280b92006-03-14 13:13:09 +11002262{
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002263 uint64_t count, resid;
David Chinner8d280b92006-03-14 13:13:09 +11002264 int weight = num_online_cpus();
David Chinner20b64282007-02-10 18:35:09 +11002265 uint64_t min = (uint64_t)min_per_cpu;
David Chinner8d280b92006-03-14 13:13:09 +11002266
David Chinner8d280b92006-03-14 13:13:09 +11002267 /* disable counter and sync counter */
2268 xfs_icsb_disable_counter(mp, field);
2269
2270 /* update counters - first CPU gets residual*/
2271 switch (field) {
2272 case XFS_SBS_ICOUNT:
2273 count = mp->m_sb.sb_icount;
2274 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002275 if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002276 return;
David Chinner8d280b92006-03-14 13:13:09 +11002277 break;
2278 case XFS_SBS_IFREE:
2279 count = mp->m_sb.sb_ifree;
2280 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002281 if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002282 return;
David Chinner8d280b92006-03-14 13:13:09 +11002283 break;
2284 case XFS_SBS_FDBLOCKS:
2285 count = mp->m_sb.sb_fdblocks;
2286 resid = do_div(count, weight);
David Chinner20b64282007-02-10 18:35:09 +11002287 if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp)))
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002288 return;
David Chinner8d280b92006-03-14 13:13:09 +11002289 break;
2290 default:
2291 BUG();
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10002292 count = resid = 0; /* quiet, gcc */
David Chinner8d280b92006-03-14 13:13:09 +11002293 break;
2294 }
2295
2296 xfs_icsb_enable_counter(mp, field, count, resid);
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002297}
2298
2299STATIC void
2300xfs_icsb_balance_counter(
2301 xfs_mount_t *mp,
2302 xfs_sb_field_t fields,
2303 int min_per_cpu)
2304{
2305 spin_lock(&mp->m_sb_lock);
2306 xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu);
2307 spin_unlock(&mp->m_sb_lock);
David Chinner8d280b92006-03-14 13:13:09 +11002308}
2309
David Chinnera8272ce2007-11-23 16:28:09 +11002310STATIC int
David Chinner20b64282007-02-10 18:35:09 +11002311xfs_icsb_modify_counters(
David Chinner8d280b92006-03-14 13:13:09 +11002312 xfs_mount_t *mp,
2313 xfs_sb_field_t field,
David Chinner20f4ebf2007-02-10 18:36:10 +11002314 int64_t delta,
David Chinner20b64282007-02-10 18:35:09 +11002315 int rsvd)
David Chinner8d280b92006-03-14 13:13:09 +11002316{
2317 xfs_icsb_cnts_t *icsbp;
2318 long long lcounter; /* long counter for 64 bit fields */
Eric Sandeen007c61c2007-10-11 17:43:56 +10002319 int cpu, ret = 0;
David Chinner8d280b92006-03-14 13:13:09 +11002320
David Chinner20b64282007-02-10 18:35:09 +11002321 might_sleep();
David Chinner8d280b92006-03-14 13:13:09 +11002322again:
2323 cpu = get_cpu();
David Chinner20b64282007-02-10 18:35:09 +11002324 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu);
2325
2326 /*
2327 * if the counter is disabled, go to slow path
2328 */
David Chinner8d280b92006-03-14 13:13:09 +11002329 if (unlikely(xfs_icsb_counter_disabled(mp, field)))
2330 goto slow_path;
David Chinner20b64282007-02-10 18:35:09 +11002331 xfs_icsb_lock_cntr(icsbp);
2332 if (unlikely(xfs_icsb_counter_disabled(mp, field))) {
2333 xfs_icsb_unlock_cntr(icsbp);
2334 goto slow_path;
2335 }
David Chinner8d280b92006-03-14 13:13:09 +11002336
2337 switch (field) {
2338 case XFS_SBS_ICOUNT:
2339 lcounter = icsbp->icsb_icount;
2340 lcounter += delta;
2341 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002342 goto balance_counter;
David Chinner8d280b92006-03-14 13:13:09 +11002343 icsbp->icsb_icount = lcounter;
2344 break;
2345
2346 case XFS_SBS_IFREE:
2347 lcounter = icsbp->icsb_ifree;
2348 lcounter += delta;
2349 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002350 goto balance_counter;
David Chinner8d280b92006-03-14 13:13:09 +11002351 icsbp->icsb_ifree = lcounter;
2352 break;
2353
2354 case XFS_SBS_FDBLOCKS:
2355 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
2356
David Chinner4be536d2006-09-07 14:26:50 +10002357 lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002358 lcounter += delta;
2359 if (unlikely(lcounter < 0))
David Chinner20b64282007-02-10 18:35:09 +11002360 goto balance_counter;
David Chinner4be536d2006-09-07 14:26:50 +10002361 icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002362 break;
2363 default:
2364 BUG();
2365 break;
2366 }
David Chinner01e1b692006-03-14 13:29:16 +11002367 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002368 put_cpu();
David Chinner8d280b92006-03-14 13:13:09 +11002369 return 0;
2370
David Chinner8d280b92006-03-14 13:13:09 +11002371slow_path:
David Chinner20b64282007-02-10 18:35:09 +11002372 put_cpu();
2373
2374 /*
2375 * serialise with a mutex so we don't burn lots of cpu on
2376 * the superblock lock. We still need to hold the superblock
2377 * lock, however, when we modify the global structures.
2378 */
David Chinner03135cf2007-02-10 18:35:15 +11002379 xfs_icsb_lock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002380
2381 /*
2382 * Now running atomically.
2383 *
2384 * If the counter is enabled, someone has beaten us to rebalancing.
2385 * Drop the lock and try again in the fast path....
2386 */
2387 if (!(xfs_icsb_counter_disabled(mp, field))) {
David Chinner03135cf2007-02-10 18:35:15 +11002388 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002389 goto again;
2390 }
2391
2392 /*
2393 * The counter is currently disabled. Because we are
2394 * running atomically here, we know a rebalance cannot
2395 * be in progress. Hence we can go straight to operating
2396 * on the global superblock. We do not call xfs_mod_incore_sb()
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002397 * here even though we need to get the m_sb_lock. Doing so
David Chinner20b64282007-02-10 18:35:09 +11002398 * will cause us to re-enter this function and deadlock.
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002399 * Hence we get the m_sb_lock ourselves and then call
David Chinner20b64282007-02-10 18:35:09 +11002400 * xfs_mod_incore_sb_unlocked() as the unlocked path operates
2401 * directly on the global counters.
2402 */
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002403 spin_lock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11002404 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
Eric Sandeen3685c2a2007-10-11 17:42:32 +10002405 spin_unlock(&mp->m_sb_lock);
David Chinner20b64282007-02-10 18:35:09 +11002406
2407 /*
2408 * Now that we've modified the global superblock, we
2409 * may be able to re-enable the distributed counters
2410 * (e.g. lots of space just got freed). After that
2411 * we are done.
2412 */
2413 if (ret != ENOSPC)
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002414 xfs_icsb_balance_counter(mp, field, 0);
David Chinner03135cf2007-02-10 18:35:15 +11002415 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002416 return ret;
2417
2418balance_counter:
David Chinner01e1b692006-03-14 13:29:16 +11002419 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002420 put_cpu();
2421
David Chinner20b64282007-02-10 18:35:09 +11002422 /*
2423 * We may have multiple threads here if multiple per-cpu
2424 * counters run dry at the same time. This will mean we can
2425 * do more balances than strictly necessary but it is not
2426 * the common slowpath case.
2427 */
David Chinner03135cf2007-02-10 18:35:15 +11002428 xfs_icsb_lock(mp);
David Chinner8d280b92006-03-14 13:13:09 +11002429
David Chinner20b64282007-02-10 18:35:09 +11002430 /*
2431 * running atomically.
2432 *
2433 * This will leave the counter in the correct state for future
2434 * accesses. After the rebalance, we simply try again and our retry
2435 * will either succeed through the fast path or slow path without
2436 * another balance operation being required.
2437 */
Christoph Hellwig45af6c62008-04-22 17:34:44 +10002438 xfs_icsb_balance_counter(mp, field, delta);
David Chinner03135cf2007-02-10 18:35:15 +11002439 xfs_icsb_unlock(mp);
David Chinner20b64282007-02-10 18:35:09 +11002440 goto again;
David Chinner8d280b92006-03-14 13:13:09 +11002441}
2442
David Chinner8d280b92006-03-14 13:13:09 +11002443#endif