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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"
27#include "xfs_dir.h"
28#include "xfs_dir2.h"
29#include "xfs_dmapi.h"
30#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_dir_sf.h"
35#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110036#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_dinode.h"
38#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110039#include "xfs_btree.h"
40#include "xfs_ialloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_alloc.h"
42#include "xfs_rtalloc.h"
43#include "xfs_bmap.h"
44#include "xfs_error.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include "xfs_rw.h"
46#include "xfs_quota.h"
47#include "xfs_fsops.h"
48
49STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
50STATIC int xfs_uuid_mount(xfs_mount_t *);
51STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100052STATIC void xfs_unmountfs_wait(xfs_mount_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
David Chinner8d280b92006-03-14 13:13:09 +110054
55#ifdef HAVE_PERCPU_SB
56STATIC void xfs_icsb_destroy_counters(xfs_mount_t *);
57STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, int);
58STATIC void xfs_icsb_sync_counters(xfs_mount_t *);
59STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
60 int, int);
61STATIC int xfs_icsb_modify_counters_locked(xfs_mount_t *, xfs_sb_field_t,
62 int, int);
David Chinnere8234a62006-03-14 13:23:52 +110063STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
David Chinner8d280b92006-03-14 13:13:09 +110064
65#else
66
67#define xfs_icsb_destroy_counters(mp) do { } while (0)
68#define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
69#define xfs_icsb_sync_counters(mp) do { } while (0)
70#define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
71#define xfs_icsb_modify_counters_locked(mp, a, b, c) do { } while (0)
72
73#endif
74
Christoph Hellwig1df84c92006-01-11 15:29:52 +110075static const struct {
David Chinner8d280b92006-03-14 13:13:09 +110076 short offset;
77 short type; /* 0 = integer
78 * 1 = binary / string (no translation)
79 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080} xfs_sb_info[] = {
81 { offsetof(xfs_sb_t, sb_magicnum), 0 },
82 { offsetof(xfs_sb_t, sb_blocksize), 0 },
83 { offsetof(xfs_sb_t, sb_dblocks), 0 },
84 { offsetof(xfs_sb_t, sb_rblocks), 0 },
85 { offsetof(xfs_sb_t, sb_rextents), 0 },
86 { offsetof(xfs_sb_t, sb_uuid), 1 },
87 { offsetof(xfs_sb_t, sb_logstart), 0 },
88 { offsetof(xfs_sb_t, sb_rootino), 0 },
89 { offsetof(xfs_sb_t, sb_rbmino), 0 },
90 { offsetof(xfs_sb_t, sb_rsumino), 0 },
91 { offsetof(xfs_sb_t, sb_rextsize), 0 },
92 { offsetof(xfs_sb_t, sb_agblocks), 0 },
93 { offsetof(xfs_sb_t, sb_agcount), 0 },
94 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
95 { offsetof(xfs_sb_t, sb_logblocks), 0 },
96 { offsetof(xfs_sb_t, sb_versionnum), 0 },
97 { offsetof(xfs_sb_t, sb_sectsize), 0 },
98 { offsetof(xfs_sb_t, sb_inodesize), 0 },
99 { offsetof(xfs_sb_t, sb_inopblock), 0 },
100 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
101 { offsetof(xfs_sb_t, sb_blocklog), 0 },
102 { offsetof(xfs_sb_t, sb_sectlog), 0 },
103 { offsetof(xfs_sb_t, sb_inodelog), 0 },
104 { offsetof(xfs_sb_t, sb_inopblog), 0 },
105 { offsetof(xfs_sb_t, sb_agblklog), 0 },
106 { offsetof(xfs_sb_t, sb_rextslog), 0 },
107 { offsetof(xfs_sb_t, sb_inprogress), 0 },
108 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
109 { offsetof(xfs_sb_t, sb_icount), 0 },
110 { offsetof(xfs_sb_t, sb_ifree), 0 },
111 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
112 { offsetof(xfs_sb_t, sb_frextents), 0 },
113 { offsetof(xfs_sb_t, sb_uquotino), 0 },
114 { offsetof(xfs_sb_t, sb_gquotino), 0 },
115 { offsetof(xfs_sb_t, sb_qflags), 0 },
116 { offsetof(xfs_sb_t, sb_flags), 0 },
117 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
118 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
119 { offsetof(xfs_sb_t, sb_unit), 0 },
120 { offsetof(xfs_sb_t, sb_width), 0 },
121 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
122 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
123 { offsetof(xfs_sb_t, sb_logsectsize),0 },
124 { offsetof(xfs_sb_t, sb_logsunit), 0 },
125 { offsetof(xfs_sb_t, sb_features2), 0 },
126 { sizeof(xfs_sb_t), 0 }
127};
128
129/*
130 * Return a pointer to an initialized xfs_mount structure.
131 */
132xfs_mount_t *
133xfs_mount_init(void)
134{
135 xfs_mount_t *mp;
136
David Chinner8d280b92006-03-14 13:13:09 +1100137 mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP);
138
139 if (xfs_icsb_init_counters(mp)) {
140 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
144 spinlock_init(&mp->m_sb_lock, "xfs_sb");
Jes Sorensen794ee1b2006-01-09 15:59:21 -0800145 mutex_init(&mp->m_ilock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 initnsema(&mp->m_growlock, 1, "xfs_grow");
147 /*
148 * Initialize the AIL.
149 */
150 xfs_trans_ail_init(mp);
151
152 atomic_set(&mp->m_active_trans, 0);
153
154 return mp;
155}
156
157/*
158 * Free up the resources associated with a mount structure. Assume that
159 * the structure was initially zeroed, so we can tell which fields got
160 * initialized.
161 */
162void
163xfs_mount_free(
David Chinner8d280b92006-03-14 13:13:09 +1100164 xfs_mount_t *mp,
165 int remove_bhv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 if (mp->m_ihash)
168 xfs_ihash_free(mp);
169 if (mp->m_chash)
170 xfs_chash_free(mp);
171
172 if (mp->m_perag) {
173 int agno;
174
175 for (agno = 0; agno < mp->m_maxagi; agno++)
176 if (mp->m_perag[agno].pagb_list)
177 kmem_free(mp->m_perag[agno].pagb_list,
178 sizeof(xfs_perag_busy_t) *
179 XFS_PAGB_NUM_SLOTS);
180 kmem_free(mp->m_perag,
181 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
182 }
183
184 AIL_LOCK_DESTROY(&mp->m_ail_lock);
185 spinlock_destroy(&mp->m_sb_lock);
186 mutex_destroy(&mp->m_ilock);
187 freesema(&mp->m_growlock);
188 if (mp->m_quotainfo)
189 XFS_QM_DONE(mp);
190
191 if (mp->m_fsname != NULL)
192 kmem_free(mp->m_fsname, mp->m_fsname_len);
Nathan Scottfc1f8c12005-11-02 11:44:33 +1100193 if (mp->m_rtname != NULL)
194 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
195 if (mp->m_logname != NULL)
196 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 if (remove_bhv) {
199 struct vfs *vfsp = XFS_MTOVFS(mp);
200
201 bhv_remove_all_vfsops(vfsp, 0);
202 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
203 }
204
David Chinner8d280b92006-03-14 13:13:09 +1100205 xfs_icsb_destroy_counters(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 kmem_free(mp, sizeof(xfs_mount_t));
207}
208
209
210/*
211 * Check the validity of the SB found.
212 */
213STATIC int
214xfs_mount_validate_sb(
215 xfs_mount_t *mp,
Nathan Scott764d1f82006-03-31 13:04:17 +1000216 xfs_sb_t *sbp,
217 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
219 /*
220 * If the log device and data device have the
221 * same device number, the log is internal.
222 * Consequently, the sb_logstart should be non-zero. If
223 * we have a zero sb_logstart in this case, we may be trying to mount
224 * a volume filesystem in a non-volume manner.
225 */
226 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000227 xfs_fs_mount_cmn_err(flags, "bad magic number");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return XFS_ERROR(EWRONGFS);
229 }
230
231 if (!XFS_SB_GOOD_VERSION(sbp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000232 xfs_fs_mount_cmn_err(flags, "bad version");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return XFS_ERROR(EWRONGFS);
234 }
235
236 if (unlikely(
237 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000238 xfs_fs_mount_cmn_err(flags,
239 "filesystem is marked as having an external log; "
240 "specify logdev on the\nmount command line.");
241 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243
244 if (unlikely(
245 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000246 xfs_fs_mount_cmn_err(flags,
247 "filesystem is marked as having an internal log; "
248 "do not specify logdev on\nthe mount command line.");
249 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
251
252 /*
253 * More sanity checking. These were stolen directly from
254 * xfs_repair.
255 */
256 if (unlikely(
257 sbp->sb_agcount <= 0 ||
258 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
259 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
260 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
261 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
262 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
263 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
264 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
265 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
266 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
267 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
Nathan Scott9f989c92006-03-14 13:29:32 +1100268 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
269 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
270 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
272 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
Nathan Scotte50bd162006-04-11 15:10:45 +1000273 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000274 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return XFS_ERROR(EFSCORRUPTED);
276 }
277
278 /*
279 * Sanity check AG count, size fields against data size field
280 */
281 if (unlikely(
282 sbp->sb_dblocks == 0 ||
283 sbp->sb_dblocks >
284 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
285 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
286 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000287 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return XFS_ERROR(EFSCORRUPTED);
289 }
290
291 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
292 ASSERT(sbp->sb_blocklog >= BBSHIFT);
293
294#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
295 if (unlikely(
296 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
297 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
298#else /* Limited by UINT_MAX of sectors */
299 if (unlikely(
300 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
301 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
302#endif
Nathan Scott764d1f82006-03-31 13:04:17 +1000303 xfs_fs_mount_cmn_err(flags,
304 "file system too large to be mounted on this system.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 return XFS_ERROR(E2BIG);
306 }
307
308 if (unlikely(sbp->sb_inprogress)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000309 xfs_fs_mount_cmn_err(flags, "file system busy");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 return XFS_ERROR(EFSCORRUPTED);
311 }
312
313 /*
Nathan Scottde206142005-05-05 13:24:13 -0700314 * Version 1 directory format has never worked on Linux.
315 */
316 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000317 xfs_fs_mount_cmn_err(flags,
318 "file system using version 1 directory format");
Nathan Scottde206142005-05-05 13:24:13 -0700319 return XFS_ERROR(ENOSYS);
320 }
321
322 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 * Until this is fixed only page-sized or smaller data blocks work.
324 */
325 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000326 xfs_fs_mount_cmn_err(flags,
327 "file system with blocksize %d bytes",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 sbp->sb_blocksize);
Nathan Scott764d1f82006-03-31 13:04:17 +1000329 xfs_fs_mount_cmn_err(flags,
330 "only pagesize (%ld) or less will currently work.",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 PAGE_SIZE);
332 return XFS_ERROR(ENOSYS);
333 }
334
335 return 0;
336}
337
338xfs_agnumber_t
Nathan Scottc11e2c32005-11-02 15:11:45 +1100339xfs_initialize_perag(
340 struct vfs *vfs,
341 xfs_mount_t *mp,
342 xfs_agnumber_t agcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 xfs_agnumber_t index, max_metadata;
345 xfs_perag_t *pag;
346 xfs_agino_t agino;
347 xfs_ino_t ino;
348 xfs_sb_t *sbp = &mp->m_sb;
349 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
350
351 /* Check to see if the filesystem can overflow 32 bit inodes */
352 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
353 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
354
355 /* Clear the mount flag if no inode can overflow 32 bits
356 * on this filesystem, or if specifically requested..
357 */
Nathan Scottc11e2c32005-11-02 15:11:45 +1100358 if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 mp->m_flags |= XFS_MOUNT_32BITINODES;
360 } else {
361 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
362 }
363
364 /* If we can overflow then setup the ag headers accordingly */
365 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
366 /* Calculate how much should be reserved for inodes to
367 * meet the max inode percentage.
368 */
369 if (mp->m_maxicount) {
370 __uint64_t icount;
371
372 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
373 do_div(icount, 100);
374 icount += sbp->sb_agblocks - 1;
Eric Sandeena749ee82005-11-02 15:13:42 +1100375 do_div(icount, sbp->sb_agblocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 max_metadata = icount;
377 } else {
378 max_metadata = agcount;
379 }
380 for (index = 0; index < agcount; index++) {
381 ino = XFS_AGINO_TO_INO(mp, index, agino);
382 if (ino > max_inum) {
383 index++;
384 break;
385 }
386
Nathan Scottc41564b2006-03-29 08:55:14 +1000387 /* This ag is preferred for inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 pag = &mp->m_perag[index];
389 pag->pagi_inodeok = 1;
390 if (index < max_metadata)
391 pag->pagf_metadata = 1;
392 }
393 } else {
394 /* Setup default behavior for smaller filesystems */
395 for (index = 0; index < agcount; index++) {
396 pag = &mp->m_perag[index];
397 pag->pagi_inodeok = 1;
398 }
399 }
400 return index;
401}
402
403/*
404 * xfs_xlatesb
405 *
406 * data - on disk version of sb
407 * sb - a superblock
408 * dir - conversion direction: <0 - convert sb to buf
409 * >0 - convert buf to sb
410 * fields - which fields to copy (bitmask)
411 */
412void
413xfs_xlatesb(
414 void *data,
415 xfs_sb_t *sb,
416 int dir,
417 __int64_t fields)
418{
419 xfs_caddr_t buf_ptr;
420 xfs_caddr_t mem_ptr;
421 xfs_sb_field_t f;
422 int first;
423 int size;
424
425 ASSERT(dir);
426 ASSERT(fields);
427
428 if (!fields)
429 return;
430
431 buf_ptr = (xfs_caddr_t)data;
432 mem_ptr = (xfs_caddr_t)sb;
433
434 while (fields) {
435 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
436 first = xfs_sb_info[f].offset;
437 size = xfs_sb_info[f + 1].offset - first;
438
439 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
440
441 if (size == 1 || xfs_sb_info[f].type == 1) {
442 if (dir > 0) {
443 memcpy(mem_ptr + first, buf_ptr + first, size);
444 } else {
445 memcpy(buf_ptr + first, mem_ptr + first, size);
446 }
447 } else {
448 switch (size) {
449 case 2:
450 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
451 *(__uint16_t*)(mem_ptr+first),
452 dir, ARCH_CONVERT);
453 break;
454 case 4:
455 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
456 *(__uint32_t*)(mem_ptr+first),
457 dir, ARCH_CONVERT);
458 break;
459 case 8:
460 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
461 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
462 break;
463 default:
464 ASSERT(0);
465 }
466 }
467
468 fields &= ~(1LL << f);
469 }
470}
471
472/*
473 * xfs_readsb
474 *
475 * Does the initial read of the superblock.
476 */
477int
Nathan Scott764d1f82006-03-31 13:04:17 +1000478xfs_readsb(xfs_mount_t *mp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 unsigned int sector_size;
481 unsigned int extra_flags;
482 xfs_buf_t *bp;
483 xfs_sb_t *sbp;
484 int error;
485
486 ASSERT(mp->m_sb_bp == NULL);
487 ASSERT(mp->m_ddev_targp != NULL);
488
489 /*
490 * Allocate a (locked) buffer to hold the superblock.
491 * This will be kept around at all times to optimize
492 * access to the superblock.
493 */
494 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
495 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
496
497 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
498 BTOBB(sector_size), extra_flags);
499 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000500 xfs_fs_mount_cmn_err(flags, "SB read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
502 goto fail;
503 }
504 ASSERT(XFS_BUF_ISBUSY(bp));
505 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
506
507 /*
508 * Initialize the mount structure from the superblock.
509 * But first do some basic consistency checking.
510 */
511 sbp = XFS_BUF_TO_SBP(bp);
512 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
513
Nathan Scott764d1f82006-03-31 13:04:17 +1000514 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 if (error) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000516 xfs_fs_mount_cmn_err(flags, "SB validate failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 goto fail;
518 }
519
520 /*
521 * We must be able to do sector-sized and sector-aligned IO.
522 */
523 if (sector_size > mp->m_sb.sb_sectsize) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000524 xfs_fs_mount_cmn_err(flags,
525 "device supports only %u byte sectors (not %u)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 sector_size, mp->m_sb.sb_sectsize);
527 error = ENOSYS;
528 goto fail;
529 }
530
531 /*
532 * If device sector size is smaller than the superblock size,
533 * re-read the superblock so the buffer is correctly sized.
534 */
535 if (sector_size < mp->m_sb.sb_sectsize) {
536 XFS_BUF_UNMANAGE(bp);
537 xfs_buf_relse(bp);
538 sector_size = mp->m_sb.sb_sectsize;
539 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
540 BTOBB(sector_size), extra_flags);
541 if (!bp || XFS_BUF_ISERROR(bp)) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000542 xfs_fs_mount_cmn_err(flags, "SB re-read failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
544 goto fail;
545 }
546 ASSERT(XFS_BUF_ISBUSY(bp));
547 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
548 }
549
David Chinner8d280b92006-03-14 13:13:09 +1100550 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
551 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
552 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 mp->m_sb_bp = bp;
555 xfs_buf_relse(bp);
556 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
557 return 0;
558
559 fail:
560 if (bp) {
561 XFS_BUF_UNMANAGE(bp);
562 xfs_buf_relse(bp);
563 }
564 return error;
565}
566
567
568/*
569 * xfs_mount_common
570 *
571 * Mount initialization code establishing various mount
572 * fields from the superblock associated with the given
573 * mount structure
574 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000575STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
577{
578 int i;
579
580 mp->m_agfrotor = mp->m_agirotor = 0;
581 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
582 mp->m_maxagi = mp->m_sb.sb_agcount;
583 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
584 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
585 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
586 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
587 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
588 mp->m_litino = sbp->sb_inodesize -
589 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
590 mp->m_blockmask = sbp->sb_blocksize - 1;
591 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
592 mp->m_blockwmask = mp->m_blockwsize - 1;
593 INIT_LIST_HEAD(&mp->m_del_inodes);
594
595 /*
596 * Setup for attributes, in case they get created.
597 * This value is for inodes getting attributes for the first time,
598 * the per-inode value is for old attribute values.
599 */
600 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
601 switch (sbp->sb_inodesize) {
602 case 256:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100603 mp->m_attroffset = XFS_LITINO(mp) -
604 XFS_BMDR_SPACE_CALC(MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 break;
606 case 512:
607 case 1024:
608 case 2048:
Nathan Scottd8cc8902005-11-02 10:34:53 +1100609 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 break;
611 default:
612 ASSERT(0);
613 }
614 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
615
616 for (i = 0; i < 2; i++) {
617 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
618 xfs_alloc, i == 0);
619 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
620 xfs_alloc, i == 0);
621 }
622 for (i = 0; i < 2; i++) {
623 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
624 xfs_bmbt, i == 0);
625 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
626 xfs_bmbt, i == 0);
627 }
628 for (i = 0; i < 2; i++) {
629 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
630 xfs_inobt, i == 0);
631 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
632 xfs_inobt, i == 0);
633 }
634
635 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
636 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
637 sbp->sb_inopblock);
638 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
639}
640/*
641 * xfs_mountfs
642 *
643 * This function does the following on an initial mount of a file system:
644 * - reads the superblock from disk and init the mount struct
645 * - if we're a 32-bit kernel, do a size check on the superblock
646 * so we don't mount terabyte filesystems
647 * - init mount struct realtime fields
648 * - allocate inode hash table for fs
649 * - init directory manager
650 * - perform recovery and init the log manager
651 */
652int
653xfs_mountfs(
654 vfs_t *vfsp,
655 xfs_mount_t *mp,
656 int mfsi_flags)
657{
658 xfs_buf_t *bp;
659 xfs_sb_t *sbp = &(mp->m_sb);
660 xfs_inode_t *rip;
661 vnode_t *rvp = NULL;
662 int readio_log, writeio_log;
663 xfs_daddr_t d;
664 __uint64_t ret64;
665 __int64_t update_flags;
666 uint quotamount, quotaflags;
667 int agno;
668 int uuid_mounted = 0;
669 int error = 0;
670
671 if (mp->m_sb_bp == NULL) {
Nathan Scott764d1f82006-03-31 13:04:17 +1000672 if ((error = xfs_readsb(mp, mfsi_flags))) {
Jesper Juhl014c2542006-01-15 02:37:08 +0100673 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 }
675 }
676 xfs_mount_common(mp, sbp);
677
678 /*
679 * Check if sb_agblocks is aligned at stripe boundary
680 * If sb_agblocks is NOT aligned turn off m_dalign since
681 * allocator alignment is within an ag, therefore ag has
682 * to be aligned at stripe boundary.
683 */
684 update_flags = 0LL;
685 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
686 /*
687 * If stripe unit and stripe width are not multiples
688 * of the fs blocksize turn off alignment.
689 */
690 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
691 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
692 if (mp->m_flags & XFS_MOUNT_RETERR) {
693 cmn_err(CE_WARN,
694 "XFS: alignment check 1 failed");
695 error = XFS_ERROR(EINVAL);
696 goto error1;
697 }
698 mp->m_dalign = mp->m_swidth = 0;
699 } else {
700 /*
701 * Convert the stripe unit and width to FSBs.
702 */
703 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
704 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
705 if (mp->m_flags & XFS_MOUNT_RETERR) {
706 error = XFS_ERROR(EINVAL);
707 goto error1;
708 }
709 xfs_fs_cmn_err(CE_WARN, mp,
710"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
711 mp->m_dalign, mp->m_swidth,
712 sbp->sb_agblocks);
713
714 mp->m_dalign = 0;
715 mp->m_swidth = 0;
716 } else if (mp->m_dalign) {
717 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
718 } else {
719 if (mp->m_flags & XFS_MOUNT_RETERR) {
720 xfs_fs_cmn_err(CE_WARN, mp,
721"stripe alignment turned off: sunit(%d) less than bsize(%d)",
722 mp->m_dalign,
723 mp->m_blockmask +1);
724 error = XFS_ERROR(EINVAL);
725 goto error1;
726 }
727 mp->m_swidth = 0;
728 }
729 }
730
731 /*
732 * Update superblock with new values
733 * and log changes
734 */
735 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
736 if (sbp->sb_unit != mp->m_dalign) {
737 sbp->sb_unit = mp->m_dalign;
738 update_flags |= XFS_SB_UNIT;
739 }
740 if (sbp->sb_width != mp->m_swidth) {
741 sbp->sb_width = mp->m_swidth;
742 update_flags |= XFS_SB_WIDTH;
743 }
744 }
745 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
746 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
747 mp->m_dalign = sbp->sb_unit;
748 mp->m_swidth = sbp->sb_width;
749 }
750
751 xfs_alloc_compute_maxlevels(mp);
752 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
753 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
754 xfs_ialloc_compute_maxlevels(mp);
755
756 if (sbp->sb_imax_pct) {
757 __uint64_t icount;
758
759 /* Make sure the maximum inode count is a multiple of the
760 * units we allocate inodes in.
761 */
762
763 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
764 do_div(icount, 100);
765 do_div(icount, mp->m_ialloc_blks);
766 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
767 sbp->sb_inopblog;
768 } else
769 mp->m_maxicount = 0;
770
771 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
772
773 /*
774 * XFS uses the uuid from the superblock as the unique
775 * identifier for fsid. We can not use the uuid from the volume
776 * since a single partition filesystem is identical to a single
777 * partition volume/filesystem.
778 */
779 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
780 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
781 if (xfs_uuid_mount(mp)) {
782 error = XFS_ERROR(EINVAL);
783 goto error1;
784 }
785 uuid_mounted=1;
786 ret64 = uuid_hash64(&sbp->sb_uuid);
787 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
788 }
789
790 /*
791 * Set the default minimum read and write sizes unless
792 * already specified in a mount option.
793 * We use smaller I/O sizes when the file system
794 * is being used for NFS service (wsync mount option).
795 */
796 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
797 if (mp->m_flags & XFS_MOUNT_WSYNC) {
798 readio_log = XFS_WSYNC_READIO_LOG;
799 writeio_log = XFS_WSYNC_WRITEIO_LOG;
800 } else {
801 readio_log = XFS_READIO_LOG_LARGE;
802 writeio_log = XFS_WRITEIO_LOG_LARGE;
803 }
804 } else {
805 readio_log = mp->m_readio_log;
806 writeio_log = mp->m_writeio_log;
807 }
808
809 /*
810 * Set the number of readahead buffers to use based on
811 * physical memory size.
812 */
813 if (xfs_physmem <= 4096) /* <= 16MB */
814 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
815 else if (xfs_physmem <= 8192) /* <= 32MB */
816 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
817 else
818 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
819 if (sbp->sb_blocklog > readio_log) {
820 mp->m_readio_log = sbp->sb_blocklog;
821 } else {
822 mp->m_readio_log = readio_log;
823 }
824 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
825 if (sbp->sb_blocklog > writeio_log) {
826 mp->m_writeio_log = sbp->sb_blocklog;
827 } else {
828 mp->m_writeio_log = writeio_log;
829 }
830 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
831
832 /*
833 * Set the inode cluster size based on the physical memory
834 * size. This may still be overridden by the file system
835 * block size if it is larger than the chosen cluster size.
836 */
837 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
838 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
839 } else {
840 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
841 }
842 /*
843 * Set whether we're using inode alignment.
844 */
845 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
846 mp->m_sb.sb_inoalignmt >=
847 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
848 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
849 else
850 mp->m_inoalign_mask = 0;
851 /*
852 * If we are using stripe alignment, check whether
853 * the stripe unit is a multiple of the inode alignment
854 */
855 if (mp->m_dalign && mp->m_inoalign_mask &&
856 !(mp->m_dalign & mp->m_inoalign_mask))
857 mp->m_sinoalign = mp->m_dalign;
858 else
859 mp->m_sinoalign = 0;
860 /*
861 * Check that the data (and log if separate) are an ok size.
862 */
863 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
864 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
865 cmn_err(CE_WARN, "XFS: size check 1 failed");
866 error = XFS_ERROR(E2BIG);
867 goto error1;
868 }
869 error = xfs_read_buf(mp, mp->m_ddev_targp,
870 d - XFS_FSS_TO_BB(mp, 1),
871 XFS_FSS_TO_BB(mp, 1), 0, &bp);
872 if (!error) {
873 xfs_buf_relse(bp);
874 } else {
875 cmn_err(CE_WARN, "XFS: size check 2 failed");
876 if (error == ENOSPC) {
877 error = XFS_ERROR(E2BIG);
878 }
879 goto error1;
880 }
881
882 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
883 mp->m_logdev_targp != mp->m_ddev_targp) {
884 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
885 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
886 cmn_err(CE_WARN, "XFS: size check 3 failed");
887 error = XFS_ERROR(E2BIG);
888 goto error1;
889 }
890 error = xfs_read_buf(mp, mp->m_logdev_targp,
891 d - XFS_FSB_TO_BB(mp, 1),
892 XFS_FSB_TO_BB(mp, 1), 0, &bp);
893 if (!error) {
894 xfs_buf_relse(bp);
895 } else {
896 cmn_err(CE_WARN, "XFS: size check 3 failed");
897 if (error == ENOSPC) {
898 error = XFS_ERROR(E2BIG);
899 }
900 goto error1;
901 }
902 }
903
904 /*
905 * Initialize realtime fields in the mount structure
906 */
907 if ((error = xfs_rtmount_init(mp))) {
908 cmn_err(CE_WARN, "XFS: RT mount failed");
909 goto error1;
910 }
911
912 /*
913 * For client case we are done now
914 */
915 if (mfsi_flags & XFS_MFSI_CLIENT) {
Jesper Juhl014c2542006-01-15 02:37:08 +0100916 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 }
918
919 /*
920 * Copies the low order bits of the timestamp and the randomly
921 * set "sequence" number out of a UUID.
922 */
923 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
924
925 /*
926 * The vfs structure needs to have a file system independent
927 * way of checking for the invariant file system ID. Since it
928 * can't look at mount structures it has a pointer to the data
929 * in the mount structure.
930 *
931 * File systems that don't support user level file handles (i.e.
932 * all of them except for XFS) will leave vfs_altfsid as NULL.
933 */
934 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
935 mp->m_dmevmask = 0; /* not persistent; set after each mount */
936
937 /*
938 * Select the right directory manager.
939 */
940 mp->m_dirops =
941 XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
942 xfsv2_dirops :
943 xfsv1_dirops;
944
945 /*
946 * Initialize directory manager's entries.
947 */
948 XFS_DIR_MOUNT(mp);
949
950 /*
951 * Initialize the attribute manager's entries.
952 */
953 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
954
955 /*
956 * Initialize the precomputed transaction reservations values.
957 */
958 xfs_trans_init(mp);
959
960 /*
961 * Allocate and initialize the inode hash table for this
962 * file system.
963 */
964 xfs_ihash_init(mp);
965 xfs_chash_init(mp);
966
967 /*
968 * Allocate and initialize the per-ag data.
969 */
970 init_rwsem(&mp->m_peraglock);
971 mp->m_perag =
972 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
973
Nathan Scottc11e2c32005-11-02 15:11:45 +1100974 mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
976 /*
977 * log's mount-time initialization. Perform 1st part recovery if needed
978 */
979 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
980 error = xfs_log_mount(mp, mp->m_logdev_targp,
981 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
982 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
983 if (error) {
984 cmn_err(CE_WARN, "XFS: log mount failed");
985 goto error2;
986 }
987 } else { /* No log has been defined */
988 cmn_err(CE_WARN, "XFS: no log defined");
989 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
990 error = XFS_ERROR(EFSCORRUPTED);
991 goto error2;
992 }
993
994 /*
995 * Get and sanity-check the root inode.
996 * Save the pointer to it in the mount structure.
997 */
998 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
999 if (error) {
1000 cmn_err(CE_WARN, "XFS: failed to read root inode");
1001 goto error3;
1002 }
1003
1004 ASSERT(rip != NULL);
1005 rvp = XFS_ITOV(rip);
1006
1007 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
1008 cmn_err(CE_WARN, "XFS: corrupted root inode");
1009 prdev("Root inode %llu is not a directory",
1010 mp->m_ddev_targp, (unsigned long long)rip->i_ino);
1011 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1012 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
1013 mp);
1014 error = XFS_ERROR(EFSCORRUPTED);
1015 goto error4;
1016 }
1017 mp->m_rootip = rip; /* save it */
1018
1019 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1020
1021 /*
1022 * Initialize realtime inode pointers in the mount structure
1023 */
1024 if ((error = xfs_rtmount_inodes(mp))) {
1025 /*
1026 * Free up the root inode.
1027 */
1028 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1029 goto error4;
1030 }
1031
1032 /*
1033 * If fs is not mounted readonly, then update the superblock
1034 * unit and width changes.
1035 */
1036 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1037 xfs_mount_log_sbunit(mp, update_flags);
1038
1039 /*
1040 * Initialise the XFS quota management subsystem for this mount
1041 */
1042 if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
1043 goto error4;
1044
1045 /*
1046 * Finish recovering the file system. This part needed to be
1047 * delayed until after the root and real-time bitmap inodes
1048 * were consistently read in.
1049 */
1050 error = xfs_log_mount_finish(mp, mfsi_flags);
1051 if (error) {
1052 cmn_err(CE_WARN, "XFS: log mount finish failed");
1053 goto error4;
1054 }
1055
1056 /*
1057 * Complete the quota initialisation, post-log-replay component.
1058 */
1059 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1060 goto error4;
1061
1062 return 0;
1063
1064 error4:
1065 /*
1066 * Free up the root inode.
1067 */
1068 VN_RELE(rvp);
1069 error3:
1070 xfs_log_unmount_dealloc(mp);
1071 error2:
1072 xfs_ihash_free(mp);
1073 xfs_chash_free(mp);
1074 for (agno = 0; agno < sbp->sb_agcount; agno++)
1075 if (mp->m_perag[agno].pagb_list)
1076 kmem_free(mp->m_perag[agno].pagb_list,
1077 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1078 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1079 mp->m_perag = NULL;
1080 /* FALLTHROUGH */
1081 error1:
1082 if (uuid_mounted)
1083 xfs_uuid_unmount(mp);
1084 xfs_freesb(mp);
1085 return error;
1086}
1087
1088/*
1089 * xfs_unmountfs
1090 *
1091 * This flushes out the inodes,dquots and the superblock, unmounts the
1092 * log and makes sure that incore structures are freed.
1093 */
1094int
1095xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1096{
1097 struct vfs *vfsp = XFS_MTOVFS(mp);
1098#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1099 int64_t fsid;
1100#endif
1101
Christoph Hellwigefa80272005-06-21 15:37:17 +10001102 xfs_iflush_all(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Nathan Scottee2a4f72006-01-11 15:33:36 +11001104 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
1106 /*
1107 * Flush out the log synchronously so that we know for sure
1108 * that nothing is pinned. This is important because bflush()
1109 * will skip pinned buffers.
1110 */
1111 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1112
1113 xfs_binval(mp->m_ddev_targp);
1114 if (mp->m_rtdev_targp) {
1115 xfs_binval(mp->m_rtdev_targp);
1116 }
1117
1118 xfs_unmountfs_writesb(mp);
1119
1120 xfs_unmountfs_wait(mp); /* wait for async bufs */
1121
1122 xfs_log_unmount(mp); /* Done! No more fs ops. */
1123
1124 xfs_freesb(mp);
1125
1126 /*
1127 * All inodes from this mount point should be freed.
1128 */
1129 ASSERT(mp->m_inodes == NULL);
1130
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 xfs_unmountfs_close(mp, cr);
1132 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1133 xfs_uuid_unmount(mp);
1134
1135#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1136 /*
1137 * clear all error tags on this filesystem
1138 */
1139 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1140 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1141#endif
1142 XFS_IODONE(vfsp);
1143 xfs_mount_free(mp, 1);
1144 return 0;
1145}
1146
1147void
1148xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1149{
1150 if (mp->m_logdev_targp != mp->m_ddev_targp)
1151 xfs_free_buftarg(mp->m_logdev_targp, 1);
1152 if (mp->m_rtdev_targp)
1153 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1154 xfs_free_buftarg(mp->m_ddev_targp, 0);
1155}
1156
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001157STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158xfs_unmountfs_wait(xfs_mount_t *mp)
1159{
1160 if (mp->m_logdev_targp != mp->m_ddev_targp)
1161 xfs_wait_buftarg(mp->m_logdev_targp);
1162 if (mp->m_rtdev_targp)
1163 xfs_wait_buftarg(mp->m_rtdev_targp);
1164 xfs_wait_buftarg(mp->m_ddev_targp);
1165}
1166
1167int
1168xfs_unmountfs_writesb(xfs_mount_t *mp)
1169{
1170 xfs_buf_t *sbp;
1171 xfs_sb_t *sb;
1172 int error = 0;
1173
1174 /*
1175 * skip superblock write if fs is read-only, or
1176 * if we are doing a forced umount.
1177 */
1178 sbp = xfs_getsb(mp, 0);
1179 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1180 XFS_FORCED_SHUTDOWN(mp))) {
David Chinner8d280b92006-03-14 13:13:09 +11001181
1182 xfs_icsb_sync_counters(mp);
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 /*
1185 * mark shared-readonly if desired
1186 */
1187 sb = XFS_BUF_TO_SBP(sbp);
1188 if (mp->m_mk_sharedro) {
1189 if (!(sb->sb_flags & XFS_SBF_READONLY))
1190 sb->sb_flags |= XFS_SBF_READONLY;
1191 if (!XFS_SB_VERSION_HASSHARED(sb))
1192 XFS_SB_VERSION_ADDSHARED(sb);
1193 xfs_fs_cmn_err(CE_NOTE, mp,
1194 "Unmounting, marking shared read-only");
1195 }
1196 XFS_BUF_UNDONE(sbp);
1197 XFS_BUF_UNREAD(sbp);
1198 XFS_BUF_UNDELAYWRITE(sbp);
1199 XFS_BUF_WRITE(sbp);
1200 XFS_BUF_UNASYNC(sbp);
1201 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1202 xfsbdstrat(mp, sbp);
1203 /* Nevermind errors we might get here. */
1204 error = xfs_iowait(sbp);
1205 if (error)
1206 xfs_ioerror_alert("xfs_unmountfs_writesb",
1207 mp, sbp, XFS_BUF_ADDR(sbp));
1208 if (error && mp->m_mk_sharedro)
1209 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1210 }
1211 xfs_buf_relse(sbp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001212 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213}
1214
1215/*
1216 * xfs_mod_sb() can be used to copy arbitrary changes to the
1217 * in-core superblock into the superblock buffer to be logged.
1218 * It does not provide the higher level of locking that is
1219 * needed to protect the in-core superblock from concurrent
1220 * access.
1221 */
1222void
1223xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1224{
1225 xfs_buf_t *bp;
1226 int first;
1227 int last;
1228 xfs_mount_t *mp;
1229 xfs_sb_t *sbp;
1230 xfs_sb_field_t f;
1231
1232 ASSERT(fields);
1233 if (!fields)
1234 return;
1235 mp = tp->t_mountp;
1236 bp = xfs_trans_getsb(tp, mp, 0);
1237 sbp = XFS_BUF_TO_SBP(bp);
1238 first = sizeof(xfs_sb_t);
1239 last = 0;
1240
1241 /* translate/copy */
1242
1243 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1244
1245 /* find modified range */
1246
1247 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1248 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1249 first = xfs_sb_info[f].offset;
1250
1251 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1252 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1253 last = xfs_sb_info[f + 1].offset - 1;
1254
1255 xfs_trans_log_buf(tp, bp, first, last);
1256}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257/*
1258 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1259 * a delta to a specified field in the in-core superblock. Simply
1260 * switch on the field indicated and apply the delta to that field.
1261 * Fields are not allowed to dip below zero, so if the delta would
1262 * do this do not apply it and return EINVAL.
1263 *
1264 * The SB_LOCK must be held when this routine is called.
1265 */
David Chinner8d280b92006-03-14 13:13:09 +11001266int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
1268 int delta, int rsvd)
1269{
1270 int scounter; /* short counter for 32 bit fields */
1271 long long lcounter; /* long counter for 64 bit fields */
1272 long long res_used, rem;
1273
1274 /*
1275 * With the in-core superblock spin lock held, switch
1276 * on the indicated field. Apply the delta to the
1277 * proper field. If the fields value would dip below
1278 * 0, then do not apply the delta and return EINVAL.
1279 */
1280 switch (field) {
1281 case XFS_SBS_ICOUNT:
1282 lcounter = (long long)mp->m_sb.sb_icount;
1283 lcounter += delta;
1284 if (lcounter < 0) {
1285 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001286 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 }
1288 mp->m_sb.sb_icount = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001289 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 case XFS_SBS_IFREE:
1291 lcounter = (long long)mp->m_sb.sb_ifree;
1292 lcounter += delta;
1293 if (lcounter < 0) {
1294 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001295 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 }
1297 mp->m_sb.sb_ifree = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001298 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 case XFS_SBS_FDBLOCKS:
1300
1301 lcounter = (long long)mp->m_sb.sb_fdblocks;
1302 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1303
1304 if (delta > 0) { /* Putting blocks back */
1305 if (res_used > delta) {
1306 mp->m_resblks_avail += delta;
1307 } else {
1308 rem = delta - res_used;
1309 mp->m_resblks_avail = mp->m_resblks;
1310 lcounter += rem;
1311 }
1312 } else { /* Taking blocks away */
1313
1314 lcounter += delta;
1315
1316 /*
1317 * If were out of blocks, use any available reserved blocks if
1318 * were allowed to.
1319 */
1320
1321 if (lcounter < 0) {
1322 if (rsvd) {
1323 lcounter = (long long)mp->m_resblks_avail + delta;
1324 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001325 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 }
1327 mp->m_resblks_avail = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001328 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 } else { /* not reserved */
Jesper Juhl014c2542006-01-15 02:37:08 +01001330 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 }
1332 }
1333 }
1334
1335 mp->m_sb.sb_fdblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001336 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 case XFS_SBS_FREXTENTS:
1338 lcounter = (long long)mp->m_sb.sb_frextents;
1339 lcounter += delta;
1340 if (lcounter < 0) {
Jesper Juhl014c2542006-01-15 02:37:08 +01001341 return XFS_ERROR(ENOSPC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 }
1343 mp->m_sb.sb_frextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001344 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 case XFS_SBS_DBLOCKS:
1346 lcounter = (long long)mp->m_sb.sb_dblocks;
1347 lcounter += delta;
1348 if (lcounter < 0) {
1349 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001350 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 }
1352 mp->m_sb.sb_dblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001353 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 case XFS_SBS_AGCOUNT:
1355 scounter = mp->m_sb.sb_agcount;
1356 scounter += delta;
1357 if (scounter < 0) {
1358 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001359 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 }
1361 mp->m_sb.sb_agcount = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001362 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 case XFS_SBS_IMAX_PCT:
1364 scounter = mp->m_sb.sb_imax_pct;
1365 scounter += delta;
1366 if (scounter < 0) {
1367 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001368 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 }
1370 mp->m_sb.sb_imax_pct = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001371 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 case XFS_SBS_REXTSIZE:
1373 scounter = mp->m_sb.sb_rextsize;
1374 scounter += delta;
1375 if (scounter < 0) {
1376 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001377 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 }
1379 mp->m_sb.sb_rextsize = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001380 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 case XFS_SBS_RBMBLOCKS:
1382 scounter = mp->m_sb.sb_rbmblocks;
1383 scounter += delta;
1384 if (scounter < 0) {
1385 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001386 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 }
1388 mp->m_sb.sb_rbmblocks = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001389 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 case XFS_SBS_RBLOCKS:
1391 lcounter = (long long)mp->m_sb.sb_rblocks;
1392 lcounter += delta;
1393 if (lcounter < 0) {
1394 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001395 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 }
1397 mp->m_sb.sb_rblocks = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001398 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 case XFS_SBS_REXTENTS:
1400 lcounter = (long long)mp->m_sb.sb_rextents;
1401 lcounter += delta;
1402 if (lcounter < 0) {
1403 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001404 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 }
1406 mp->m_sb.sb_rextents = lcounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001407 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 case XFS_SBS_REXTSLOG:
1409 scounter = mp->m_sb.sb_rextslog;
1410 scounter += delta;
1411 if (scounter < 0) {
1412 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001413 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 }
1415 mp->m_sb.sb_rextslog = scounter;
Jesper Juhl014c2542006-01-15 02:37:08 +01001416 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 default:
1418 ASSERT(0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001419 return XFS_ERROR(EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 }
1421}
1422
1423/*
1424 * xfs_mod_incore_sb() is used to change a field in the in-core
1425 * superblock structure by the specified delta. This modification
1426 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1427 * routine to do the work.
1428 */
1429int
1430xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
1431{
1432 unsigned long s;
1433 int status;
1434
David Chinner8d280b92006-03-14 13:13:09 +11001435 /* check for per-cpu counters */
1436 switch (field) {
1437#ifdef HAVE_PERCPU_SB
1438 case XFS_SBS_ICOUNT:
1439 case XFS_SBS_IFREE:
1440 case XFS_SBS_FDBLOCKS:
1441 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1442 status = xfs_icsb_modify_counters(mp, field,
1443 delta, rsvd);
1444 break;
1445 }
1446 /* FALLTHROUGH */
1447#endif
1448 default:
1449 s = XFS_SB_LOCK(mp);
1450 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1451 XFS_SB_UNLOCK(mp, s);
1452 break;
1453 }
1454
Jesper Juhl014c2542006-01-15 02:37:08 +01001455 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456}
1457
1458/*
1459 * xfs_mod_incore_sb_batch() is used to change more than one field
1460 * in the in-core superblock structure at a time. This modification
1461 * is protected by a lock internal to this module. The fields and
1462 * changes to those fields are specified in the array of xfs_mod_sb
1463 * structures passed in.
1464 *
1465 * Either all of the specified deltas will be applied or none of
1466 * them will. If any modified field dips below 0, then all modifications
1467 * will be backed out and EINVAL will be returned.
1468 */
1469int
1470xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1471{
1472 unsigned long s;
1473 int status=0;
1474 xfs_mod_sb_t *msbp;
1475
1476 /*
1477 * Loop through the array of mod structures and apply each
1478 * individually. If any fail, then back out all those
1479 * which have already been applied. Do all of this within
1480 * the scope of the SB_LOCK so that all of the changes will
1481 * be atomic.
1482 */
1483 s = XFS_SB_LOCK(mp);
1484 msbp = &msb[0];
1485 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1486 /*
1487 * Apply the delta at index n. If it fails, break
1488 * from the loop so we'll fall into the undo loop
1489 * below.
1490 */
David Chinner8d280b92006-03-14 13:13:09 +11001491 switch (msbp->msb_field) {
1492#ifdef HAVE_PERCPU_SB
1493 case XFS_SBS_ICOUNT:
1494 case XFS_SBS_IFREE:
1495 case XFS_SBS_FDBLOCKS:
1496 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1497 status = xfs_icsb_modify_counters_locked(mp,
1498 msbp->msb_field,
1499 msbp->msb_delta, rsvd);
1500 break;
1501 }
1502 /* FALLTHROUGH */
1503#endif
1504 default:
1505 status = xfs_mod_incore_sb_unlocked(mp,
1506 msbp->msb_field,
1507 msbp->msb_delta, rsvd);
1508 break;
1509 }
1510
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 if (status != 0) {
1512 break;
1513 }
1514 }
1515
1516 /*
1517 * If we didn't complete the loop above, then back out
1518 * any changes made to the superblock. If you add code
1519 * between the loop above and here, make sure that you
1520 * preserve the value of status. Loop back until
1521 * we step below the beginning of the array. Make sure
1522 * we don't touch anything back there.
1523 */
1524 if (status != 0) {
1525 msbp--;
1526 while (msbp >= msb) {
David Chinner8d280b92006-03-14 13:13:09 +11001527 switch (msbp->msb_field) {
1528#ifdef HAVE_PERCPU_SB
1529 case XFS_SBS_ICOUNT:
1530 case XFS_SBS_IFREE:
1531 case XFS_SBS_FDBLOCKS:
1532 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
1533 status =
1534 xfs_icsb_modify_counters_locked(mp,
1535 msbp->msb_field,
1536 -(msbp->msb_delta),
1537 rsvd);
1538 break;
1539 }
1540 /* FALLTHROUGH */
1541#endif
1542 default:
1543 status = xfs_mod_incore_sb_unlocked(mp,
1544 msbp->msb_field,
1545 -(msbp->msb_delta),
1546 rsvd);
1547 break;
1548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 ASSERT(status == 0);
1550 msbp--;
1551 }
1552 }
1553 XFS_SB_UNLOCK(mp, s);
Jesper Juhl014c2542006-01-15 02:37:08 +01001554 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555}
1556
1557/*
1558 * xfs_getsb() is called to obtain the buffer for the superblock.
1559 * The buffer is returned locked and read in from disk.
1560 * The buffer should be released with a call to xfs_brelse().
1561 *
1562 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1563 * the superblock buffer if it can be locked without sleeping.
1564 * If it can't then we'll return NULL.
1565 */
1566xfs_buf_t *
1567xfs_getsb(
1568 xfs_mount_t *mp,
1569 int flags)
1570{
1571 xfs_buf_t *bp;
1572
1573 ASSERT(mp->m_sb_bp != NULL);
1574 bp = mp->m_sb_bp;
1575 if (flags & XFS_BUF_TRYLOCK) {
1576 if (!XFS_BUF_CPSEMA(bp)) {
1577 return NULL;
1578 }
1579 } else {
1580 XFS_BUF_PSEMA(bp, PRIBIO);
1581 }
1582 XFS_BUF_HOLD(bp);
1583 ASSERT(XFS_BUF_ISDONE(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001584 return bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585}
1586
1587/*
1588 * Used to free the superblock along various error paths.
1589 */
1590void
1591xfs_freesb(
1592 xfs_mount_t *mp)
1593{
1594 xfs_buf_t *bp;
1595
1596 /*
1597 * Use xfs_getsb() so that the buffer will be locked
1598 * when we call xfs_buf_relse().
1599 */
1600 bp = xfs_getsb(mp, 0);
1601 XFS_BUF_UNMANAGE(bp);
1602 xfs_buf_relse(bp);
1603 mp->m_sb_bp = NULL;
1604}
1605
1606/*
1607 * See if the UUID is unique among mounted XFS filesystems.
1608 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1609 */
1610STATIC int
1611xfs_uuid_mount(
1612 xfs_mount_t *mp)
1613{
1614 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1615 cmn_err(CE_WARN,
1616 "XFS: Filesystem %s has nil UUID - can't mount",
1617 mp->m_fsname);
1618 return -1;
1619 }
1620 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1621 cmn_err(CE_WARN,
1622 "XFS: Filesystem %s has duplicate UUID - can't mount",
1623 mp->m_fsname);
1624 return -1;
1625 }
1626 return 0;
1627}
1628
1629/*
1630 * Remove filesystem from the UUID table.
1631 */
1632STATIC void
1633xfs_uuid_unmount(
1634 xfs_mount_t *mp)
1635{
1636 uuid_table_remove(&mp->m_sb.sb_uuid);
1637}
1638
1639/*
1640 * Used to log changes to the superblock unit and width fields which could
1641 * be altered by the mount options. Only the first superblock is updated.
1642 */
1643STATIC void
1644xfs_mount_log_sbunit(
1645 xfs_mount_t *mp,
1646 __int64_t fields)
1647{
1648 xfs_trans_t *tp;
1649
1650 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1651
1652 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1653 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1654 XFS_DEFAULT_LOG_COUNT)) {
1655 xfs_trans_cancel(tp, 0);
1656 return;
1657 }
1658 xfs_mod_sb(tp, fields);
1659 xfs_trans_commit(tp, 0, NULL);
1660}
David Chinner8d280b92006-03-14 13:13:09 +11001661
1662
1663#ifdef HAVE_PERCPU_SB
1664/*
1665 * Per-cpu incore superblock counters
1666 *
1667 * Simple concept, difficult implementation
1668 *
1669 * Basically, replace the incore superblock counters with a distributed per cpu
1670 * counter for contended fields (e.g. free block count).
1671 *
1672 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1673 * hence needs to be accurately read when we are running low on space. Hence
1674 * there is a method to enable and disable the per-cpu counters based on how
1675 * much "stuff" is available in them.
1676 *
1677 * Basically, a counter is enabled if there is enough free resource to justify
1678 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1679 * ENOSPC), then we disable the counters to synchronise all callers and
1680 * re-distribute the available resources.
1681 *
1682 * If, once we redistributed the available resources, we still get a failure,
1683 * we disable the per-cpu counter and go through the slow path.
1684 *
1685 * The slow path is the current xfs_mod_incore_sb() function. This means that
1686 * when we disable a per-cpu counter, we need to drain it's resources back to
1687 * the global superblock. We do this after disabling the counter to prevent
1688 * more threads from queueing up on the counter.
1689 *
1690 * Essentially, this means that we still need a lock in the fast path to enable
1691 * synchronisation between the global counters and the per-cpu counters. This
1692 * is not a problem because the lock will be local to a CPU almost all the time
1693 * and have little contention except when we get to ENOSPC conditions.
1694 *
1695 * Basically, this lock becomes a barrier that enables us to lock out the fast
1696 * path while we do things like enabling and disabling counters and
1697 * synchronising the counters.
1698 *
1699 * Locking rules:
1700 *
1701 * 1. XFS_SB_LOCK() before picking up per-cpu locks
1702 * 2. per-cpu locks always picked up via for_each_online_cpu() order
1703 * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks
1704 * 4. modifying per-cpu counters requires holding per-cpu lock
1705 * 5. modifying global counters requires holding XFS_SB_LOCK
1706 * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK
1707 * and _none_ of the per-cpu locks.
1708 *
1709 * Disabled counters are only ever re-enabled by a balance operation
1710 * that results in more free resources per CPU than a given threshold.
1711 * To ensure counters don't remain disabled, they are rebalanced when
1712 * the global resource goes above a higher threshold (i.e. some hysteresis
1713 * is present to prevent thrashing).
David Chinner8d280b92006-03-14 13:13:09 +11001714 */
David Chinnere8234a62006-03-14 13:23:52 +11001715
1716/*
1717 * hot-plug CPU notifier support.
1718 *
1719 * We cannot use the hotcpu_register() function because it does
1720 * not allow notifier instances. We need a notifier per filesystem
1721 * as we need to be able to identify the filesystem to balance
Nathan Scottc41564b2006-03-29 08:55:14 +10001722 * the counters out. This is achieved by having a notifier block
David Chinnere8234a62006-03-14 13:23:52 +11001723 * embedded in the xfs_mount_t and doing pointer magic to get the
1724 * mount pointer from the notifier block address.
1725 */
1726STATIC int
1727xfs_icsb_cpu_notify(
1728 struct notifier_block *nfb,
1729 unsigned long action,
1730 void *hcpu)
1731{
1732 xfs_icsb_cnts_t *cntp;
1733 xfs_mount_t *mp;
1734 int s;
1735
1736 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
1737 cntp = (xfs_icsb_cnts_t *)
1738 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
1739 switch (action) {
1740 case CPU_UP_PREPARE:
1741 /* Easy Case - initialize the area and locks, and
1742 * then rebalance when online does everything else for us. */
David Chinner01e1b692006-03-14 13:29:16 +11001743 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001744 break;
1745 case CPU_ONLINE:
1746 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
1747 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
1748 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
1749 break;
1750 case CPU_DEAD:
1751 /* Disable all the counters, then fold the dead cpu's
1752 * count into the total on the global superblock and
1753 * re-enable the counters. */
1754 s = XFS_SB_LOCK(mp);
1755 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
1756 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
1757 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
1758
1759 mp->m_sb.sb_icount += cntp->icsb_icount;
1760 mp->m_sb.sb_ifree += cntp->icsb_ifree;
1761 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
1762
David Chinner01e1b692006-03-14 13:29:16 +11001763 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinnere8234a62006-03-14 13:23:52 +11001764
1765 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, XFS_ICSB_SB_LOCKED);
1766 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, XFS_ICSB_SB_LOCKED);
1767 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, XFS_ICSB_SB_LOCKED);
1768 XFS_SB_UNLOCK(mp, s);
1769 break;
1770 }
1771
1772 return NOTIFY_OK;
1773}
1774
David Chinner8d280b92006-03-14 13:13:09 +11001775int
1776xfs_icsb_init_counters(
1777 xfs_mount_t *mp)
1778{
1779 xfs_icsb_cnts_t *cntp;
1780 int i;
1781
1782 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
1783 if (mp->m_sb_cnts == NULL)
1784 return -ENOMEM;
1785
David Chinnere8234a62006-03-14 13:23:52 +11001786 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
1787 mp->m_icsb_notifier.priority = 0;
1788 register_cpu_notifier(&mp->m_icsb_notifier);
1789
David Chinner8d280b92006-03-14 13:13:09 +11001790 for_each_online_cpu(i) {
1791 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001792 memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
David Chinner8d280b92006-03-14 13:13:09 +11001793 }
1794 /*
1795 * start with all counters disabled so that the
1796 * initial balance kicks us off correctly
1797 */
1798 mp->m_icsb_counters = -1;
1799 return 0;
1800}
1801
1802STATIC void
1803xfs_icsb_destroy_counters(
1804 xfs_mount_t *mp)
1805{
David Chinnere8234a62006-03-14 13:23:52 +11001806 if (mp->m_sb_cnts) {
1807 unregister_cpu_notifier(&mp->m_icsb_notifier);
David Chinner8d280b92006-03-14 13:13:09 +11001808 free_percpu(mp->m_sb_cnts);
David Chinnere8234a62006-03-14 13:23:52 +11001809 }
David Chinner8d280b92006-03-14 13:13:09 +11001810}
1811
David Chinner01e1b692006-03-14 13:29:16 +11001812STATIC inline void
1813xfs_icsb_lock_cntr(
1814 xfs_icsb_cnts_t *icsbp)
1815{
1816 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
1817 ndelay(1000);
1818 }
1819}
1820
1821STATIC inline void
1822xfs_icsb_unlock_cntr(
1823 xfs_icsb_cnts_t *icsbp)
1824{
1825 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
1826}
1827
David Chinner8d280b92006-03-14 13:13:09 +11001828
1829STATIC inline void
1830xfs_icsb_lock_all_counters(
1831 xfs_mount_t *mp)
1832{
1833 xfs_icsb_cnts_t *cntp;
1834 int i;
1835
1836 for_each_online_cpu(i) {
1837 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001838 xfs_icsb_lock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11001839 }
1840}
1841
1842STATIC inline void
1843xfs_icsb_unlock_all_counters(
1844 xfs_mount_t *mp)
1845{
1846 xfs_icsb_cnts_t *cntp;
1847 int i;
1848
1849 for_each_online_cpu(i) {
1850 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
David Chinner01e1b692006-03-14 13:29:16 +11001851 xfs_icsb_unlock_cntr(cntp);
David Chinner8d280b92006-03-14 13:13:09 +11001852 }
1853}
1854
1855STATIC void
1856xfs_icsb_count(
1857 xfs_mount_t *mp,
1858 xfs_icsb_cnts_t *cnt,
1859 int flags)
1860{
1861 xfs_icsb_cnts_t *cntp;
1862 int i;
1863
1864 memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
1865
1866 if (!(flags & XFS_ICSB_LAZY_COUNT))
1867 xfs_icsb_lock_all_counters(mp);
1868
1869 for_each_online_cpu(i) {
1870 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
1871 cnt->icsb_icount += cntp->icsb_icount;
1872 cnt->icsb_ifree += cntp->icsb_ifree;
1873 cnt->icsb_fdblocks += cntp->icsb_fdblocks;
1874 }
1875
1876 if (!(flags & XFS_ICSB_LAZY_COUNT))
1877 xfs_icsb_unlock_all_counters(mp);
1878}
1879
1880STATIC int
1881xfs_icsb_counter_disabled(
1882 xfs_mount_t *mp,
1883 xfs_sb_field_t field)
1884{
1885 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1886 return test_bit(field, &mp->m_icsb_counters);
1887}
1888
1889STATIC int
1890xfs_icsb_disable_counter(
1891 xfs_mount_t *mp,
1892 xfs_sb_field_t field)
1893{
1894 xfs_icsb_cnts_t cnt;
1895
1896 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1897
1898 xfs_icsb_lock_all_counters(mp);
1899 if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
1900 /* drain back to superblock */
1901
1902 xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT);
1903 switch(field) {
1904 case XFS_SBS_ICOUNT:
1905 mp->m_sb.sb_icount = cnt.icsb_icount;
1906 break;
1907 case XFS_SBS_IFREE:
1908 mp->m_sb.sb_ifree = cnt.icsb_ifree;
1909 break;
1910 case XFS_SBS_FDBLOCKS:
1911 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
1912 break;
1913 default:
1914 BUG();
1915 }
1916 }
1917
1918 xfs_icsb_unlock_all_counters(mp);
1919
1920 return 0;
1921}
1922
1923STATIC void
1924xfs_icsb_enable_counter(
1925 xfs_mount_t *mp,
1926 xfs_sb_field_t field,
1927 uint64_t count,
1928 uint64_t resid)
1929{
1930 xfs_icsb_cnts_t *cntp;
1931 int i;
1932
1933 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
1934
1935 xfs_icsb_lock_all_counters(mp);
1936 for_each_online_cpu(i) {
1937 cntp = per_cpu_ptr(mp->m_sb_cnts, i);
1938 switch (field) {
1939 case XFS_SBS_ICOUNT:
1940 cntp->icsb_icount = count + resid;
1941 break;
1942 case XFS_SBS_IFREE:
1943 cntp->icsb_ifree = count + resid;
1944 break;
1945 case XFS_SBS_FDBLOCKS:
1946 cntp->icsb_fdblocks = count + resid;
1947 break;
1948 default:
1949 BUG();
1950 break;
1951 }
1952 resid = 0;
1953 }
1954 clear_bit(field, &mp->m_icsb_counters);
1955 xfs_icsb_unlock_all_counters(mp);
1956}
1957
1958STATIC void
1959xfs_icsb_sync_counters_int(
1960 xfs_mount_t *mp,
1961 int flags)
1962{
1963 xfs_icsb_cnts_t cnt;
1964 int s;
1965
1966 /* Pass 1: lock all counters */
1967 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
1968 s = XFS_SB_LOCK(mp);
1969
1970 xfs_icsb_count(mp, &cnt, flags);
1971
1972 /* Step 3: update mp->m_sb fields */
1973 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
1974 mp->m_sb.sb_icount = cnt.icsb_icount;
1975 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
1976 mp->m_sb.sb_ifree = cnt.icsb_ifree;
1977 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
1978 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
1979
1980 if ((flags & XFS_ICSB_SB_LOCKED) == 0)
1981 XFS_SB_UNLOCK(mp, s);
1982}
1983
1984/*
1985 * Accurate update of per-cpu counters to incore superblock
1986 */
1987STATIC void
1988xfs_icsb_sync_counters(
1989 xfs_mount_t *mp)
1990{
1991 xfs_icsb_sync_counters_int(mp, 0);
1992}
1993
1994/*
1995 * lazy addition used for things like df, background sb syncs, etc
1996 */
1997void
1998xfs_icsb_sync_counters_lazy(
1999 xfs_mount_t *mp)
2000{
2001 xfs_icsb_sync_counters_int(mp, XFS_ICSB_LAZY_COUNT);
2002}
2003
2004/*
2005 * Balance and enable/disable counters as necessary.
2006 *
2007 * Thresholds for re-enabling counters are somewhat magic.
2008 * inode counts are chosen to be the same number as single
2009 * on disk allocation chunk per CPU, and free blocks is
2010 * something far enough zero that we aren't going thrash
2011 * when we get near ENOSPC.
2012 */
2013#define XFS_ICSB_INO_CNTR_REENABLE 64
2014#define XFS_ICSB_FDBLK_CNTR_REENABLE 512
2015STATIC void
2016xfs_icsb_balance_counter(
2017 xfs_mount_t *mp,
2018 xfs_sb_field_t field,
2019 int flags)
2020{
2021 uint64_t count, resid = 0;
2022 int weight = num_online_cpus();
2023 int s;
2024
2025 if (!(flags & XFS_ICSB_SB_LOCKED))
2026 s = XFS_SB_LOCK(mp);
2027
2028 /* disable counter and sync counter */
2029 xfs_icsb_disable_counter(mp, field);
2030
2031 /* update counters - first CPU gets residual*/
2032 switch (field) {
2033 case XFS_SBS_ICOUNT:
2034 count = mp->m_sb.sb_icount;
2035 resid = do_div(count, weight);
2036 if (count < XFS_ICSB_INO_CNTR_REENABLE)
2037 goto out;
2038 break;
2039 case XFS_SBS_IFREE:
2040 count = mp->m_sb.sb_ifree;
2041 resid = do_div(count, weight);
2042 if (count < XFS_ICSB_INO_CNTR_REENABLE)
2043 goto out;
2044 break;
2045 case XFS_SBS_FDBLOCKS:
2046 count = mp->m_sb.sb_fdblocks;
2047 resid = do_div(count, weight);
2048 if (count < XFS_ICSB_FDBLK_CNTR_REENABLE)
2049 goto out;
2050 break;
2051 default:
2052 BUG();
2053 break;
2054 }
2055
2056 xfs_icsb_enable_counter(mp, field, count, resid);
2057out:
2058 if (!(flags & XFS_ICSB_SB_LOCKED))
2059 XFS_SB_UNLOCK(mp, s);
2060}
2061
2062STATIC int
2063xfs_icsb_modify_counters_int(
2064 xfs_mount_t *mp,
2065 xfs_sb_field_t field,
2066 int delta,
2067 int rsvd,
2068 int flags)
2069{
2070 xfs_icsb_cnts_t *icsbp;
2071 long long lcounter; /* long counter for 64 bit fields */
2072 int cpu, s, locked = 0;
2073 int ret = 0, balance_done = 0;
2074
2075again:
2076 cpu = get_cpu();
2077 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu),
David Chinner01e1b692006-03-14 13:29:16 +11002078 xfs_icsb_lock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002079 if (unlikely(xfs_icsb_counter_disabled(mp, field)))
2080 goto slow_path;
2081
2082 switch (field) {
2083 case XFS_SBS_ICOUNT:
2084 lcounter = icsbp->icsb_icount;
2085 lcounter += delta;
2086 if (unlikely(lcounter < 0))
2087 goto slow_path;
2088 icsbp->icsb_icount = lcounter;
2089 break;
2090
2091 case XFS_SBS_IFREE:
2092 lcounter = icsbp->icsb_ifree;
2093 lcounter += delta;
2094 if (unlikely(lcounter < 0))
2095 goto slow_path;
2096 icsbp->icsb_ifree = lcounter;
2097 break;
2098
2099 case XFS_SBS_FDBLOCKS:
2100 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
2101
2102 lcounter = icsbp->icsb_fdblocks;
2103 lcounter += delta;
2104 if (unlikely(lcounter < 0))
2105 goto slow_path;
2106 icsbp->icsb_fdblocks = lcounter;
2107 break;
2108 default:
2109 BUG();
2110 break;
2111 }
David Chinner01e1b692006-03-14 13:29:16 +11002112 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002113 put_cpu();
2114 if (locked)
2115 XFS_SB_UNLOCK(mp, s);
2116 return 0;
2117
2118 /*
2119 * The slow path needs to be run with the SBLOCK
2120 * held so that we prevent other threads from
2121 * attempting to run this path at the same time.
2122 * this provides exclusion for the balancing code,
2123 * and exclusive fallback if the balance does not
2124 * provide enough resources to continue in an unlocked
2125 * manner.
2126 */
2127slow_path:
David Chinner01e1b692006-03-14 13:29:16 +11002128 xfs_icsb_unlock_cntr(icsbp);
David Chinner8d280b92006-03-14 13:13:09 +11002129 put_cpu();
2130
2131 /* need to hold superblock incase we need
2132 * to disable a counter */
2133 if (!(flags & XFS_ICSB_SB_LOCKED)) {
2134 s = XFS_SB_LOCK(mp);
2135 locked = 1;
2136 flags |= XFS_ICSB_SB_LOCKED;
2137 }
2138 if (!balance_done) {
2139 xfs_icsb_balance_counter(mp, field, flags);
2140 balance_done = 1;
2141 goto again;
2142 } else {
2143 /*
2144 * we might not have enough on this local
2145 * cpu to allocate for a bulk request.
2146 * We need to drain this field from all CPUs
2147 * and disable the counter fastpath
2148 */
2149 xfs_icsb_disable_counter(mp, field);
2150 }
2151
2152 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
2153
2154 if (locked)
2155 XFS_SB_UNLOCK(mp, s);
2156 return ret;
2157}
2158
2159STATIC int
2160xfs_icsb_modify_counters(
2161 xfs_mount_t *mp,
2162 xfs_sb_field_t field,
2163 int delta,
2164 int rsvd)
2165{
2166 return xfs_icsb_modify_counters_int(mp, field, delta, rsvd, 0);
2167}
2168
2169/*
2170 * Called when superblock is already locked
2171 */
2172STATIC int
2173xfs_icsb_modify_counters_locked(
2174 xfs_mount_t *mp,
2175 xfs_sb_field_t field,
2176 int delta,
2177 int rsvd)
2178{
2179 return xfs_icsb_modify_counters_int(mp, field, delta,
2180 rsvd, XFS_ICSB_SB_LOCKED);
2181}
2182#endif