Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Dave Chinner | 70a9883 | 2013-10-23 10:36:05 +1100 | [diff] [blame] | 20 | #include "xfs_shared.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 21 | #include "xfs_format.h" |
| 22 | #include "xfs_log_format.h" |
| 23 | #include "xfs_trans_resv.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 24 | #include "xfs_bit.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 25 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "xfs_sb.h" |
| 27 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "xfs_mount.h" |
Dave Chinner | 5706278 | 2013-10-15 09:17:51 +1100 | [diff] [blame] | 29 | #include "xfs_da_format.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "xfs_inode.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 31 | #include "xfs_dir2.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 32 | #include "xfs_ialloc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include "xfs_alloc.h" |
| 34 | #include "xfs_rtalloc.h" |
| 35 | #include "xfs_bmap.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 36 | #include "xfs_trans.h" |
| 37 | #include "xfs_trans_priv.h" |
| 38 | #include "xfs_log.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "xfs_error.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include "xfs_quota.h" |
| 41 | #include "xfs_fsops.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 42 | #include "xfs_trace.h" |
Dave Chinner | 6d8b79c | 2012-10-08 21:56:09 +1100 | [diff] [blame] | 43 | #include "xfs_icache.h" |
Dave Chinner | 8f80587 | 2013-11-01 15:27:20 +1100 | [diff] [blame] | 44 | #include "xfs_dinode.h" |
Brian Foster | a31b1d3 | 2014-07-15 08:07:01 +1000 | [diff] [blame] | 45 | #include "xfs_sysfs.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 48 | #ifdef HAVE_PERCPU_SB |
David Chinner | 20f4ebf | 2007-02-10 18:36:10 +1100 | [diff] [blame] | 49 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 50 | int); |
| 51 | STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t, |
| 52 | int); |
David Chinner | 36fbe6e | 2008-04-10 12:19:56 +1000 | [diff] [blame] | 53 | STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 54 | #else |
| 55 | |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 56 | #define xfs_icsb_balance_counter(mp, a, b) do { } while (0) |
| 57 | #define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0) |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 58 | #endif |
| 59 | |
Christoph Hellwig | 2717420 | 2009-03-30 10:21:31 +0200 | [diff] [blame] | 60 | static DEFINE_MUTEX(xfs_uuid_table_mutex); |
| 61 | static int xfs_uuid_table_size; |
| 62 | static uuid_t *xfs_uuid_table; |
| 63 | |
| 64 | /* |
| 65 | * See if the UUID is unique among mounted XFS filesystems. |
| 66 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. |
| 67 | */ |
| 68 | STATIC int |
| 69 | xfs_uuid_mount( |
| 70 | struct xfs_mount *mp) |
| 71 | { |
| 72 | uuid_t *uuid = &mp->m_sb.sb_uuid; |
| 73 | int hole, i; |
| 74 | |
| 75 | if (mp->m_flags & XFS_MOUNT_NOUUID) |
| 76 | return 0; |
| 77 | |
| 78 | if (uuid_is_nil(uuid)) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 79 | xfs_warn(mp, "Filesystem has nil UUID - can't mount"); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 80 | return -EINVAL; |
Christoph Hellwig | 2717420 | 2009-03-30 10:21:31 +0200 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | mutex_lock(&xfs_uuid_table_mutex); |
| 84 | for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) { |
| 85 | if (uuid_is_nil(&xfs_uuid_table[i])) { |
| 86 | hole = i; |
| 87 | continue; |
| 88 | } |
| 89 | if (uuid_equal(uuid, &xfs_uuid_table[i])) |
| 90 | goto out_duplicate; |
| 91 | } |
| 92 | |
| 93 | if (hole < 0) { |
| 94 | xfs_uuid_table = kmem_realloc(xfs_uuid_table, |
| 95 | (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table), |
| 96 | xfs_uuid_table_size * sizeof(*xfs_uuid_table), |
| 97 | KM_SLEEP); |
| 98 | hole = xfs_uuid_table_size++; |
| 99 | } |
| 100 | xfs_uuid_table[hole] = *uuid; |
| 101 | mutex_unlock(&xfs_uuid_table_mutex); |
| 102 | |
| 103 | return 0; |
| 104 | |
| 105 | out_duplicate: |
| 106 | mutex_unlock(&xfs_uuid_table_mutex); |
Mitsuo Hayasaka | 021000e | 2012-01-13 05:58:39 +0000 | [diff] [blame] | 107 | xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 108 | return -EINVAL; |
Christoph Hellwig | 2717420 | 2009-03-30 10:21:31 +0200 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | STATIC void |
| 112 | xfs_uuid_unmount( |
| 113 | struct xfs_mount *mp) |
| 114 | { |
| 115 | uuid_t *uuid = &mp->m_sb.sb_uuid; |
| 116 | int i; |
| 117 | |
| 118 | if (mp->m_flags & XFS_MOUNT_NOUUID) |
| 119 | return; |
| 120 | |
| 121 | mutex_lock(&xfs_uuid_table_mutex); |
| 122 | for (i = 0; i < xfs_uuid_table_size; i++) { |
| 123 | if (uuid_is_nil(&xfs_uuid_table[i])) |
| 124 | continue; |
| 125 | if (!uuid_equal(uuid, &xfs_uuid_table[i])) |
| 126 | continue; |
| 127 | memset(&xfs_uuid_table[i], 0, sizeof(uuid_t)); |
| 128 | break; |
| 129 | } |
| 130 | ASSERT(i < xfs_uuid_table_size); |
| 131 | mutex_unlock(&xfs_uuid_table_mutex); |
| 132 | } |
| 133 | |
| 134 | |
Dave Chinner | e176579 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 135 | STATIC void |
| 136 | __xfs_free_perag( |
| 137 | struct rcu_head *head) |
| 138 | { |
| 139 | struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head); |
| 140 | |
| 141 | ASSERT(atomic_read(&pag->pag_ref) == 0); |
| 142 | kmem_free(pag); |
| 143 | } |
| 144 | |
Dave Chinner | 0fa800f | 2010-01-11 11:47:46 +0000 | [diff] [blame] | 145 | /* |
Dave Chinner | e176579 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 146 | * Free up the per-ag resources associated with the mount structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | */ |
Christoph Hellwig | c962fb7 | 2008-05-20 15:10:52 +1000 | [diff] [blame] | 148 | STATIC void |
Christoph Hellwig | ff4f038 | 2008-08-13 16:50:47 +1000 | [diff] [blame] | 149 | xfs_free_perag( |
Christoph Hellwig | 745f691 | 2007-08-30 17:20:39 +1000 | [diff] [blame] | 150 | xfs_mount_t *mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | { |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 152 | xfs_agnumber_t agno; |
| 153 | struct xfs_perag *pag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 155 | for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { |
| 156 | spin_lock(&mp->m_perag_lock); |
| 157 | pag = radix_tree_delete(&mp->m_perag_tree, agno); |
| 158 | spin_unlock(&mp->m_perag_lock); |
Dave Chinner | e176579 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 159 | ASSERT(pag); |
Dave Chinner | f83282a | 2010-11-08 08:55:04 +0000 | [diff] [blame] | 160 | ASSERT(atomic_read(&pag->pag_ref) == 0); |
Dave Chinner | e176579 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 161 | call_rcu(&pag->rcu_head, __xfs_free_perag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Nathan Scott | 4cc929e | 2007-05-14 18:24:02 +1000 | [diff] [blame] | 165 | /* |
| 166 | * Check size of device based on the (data/realtime) block count. |
| 167 | * Note: this check is used by the growfs code as well as mount. |
| 168 | */ |
| 169 | int |
| 170 | xfs_sb_validate_fsb_count( |
| 171 | xfs_sb_t *sbp, |
| 172 | __uint64_t nblocks) |
| 173 | { |
| 174 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); |
| 175 | ASSERT(sbp->sb_blocklog >= BBSHIFT); |
| 176 | |
Christoph Hellwig | d5cf09b | 2014-07-30 09:12:05 +1000 | [diff] [blame] | 177 | /* Limited by ULONG_MAX of page cache index */ |
Nathan Scott | 4cc929e | 2007-05-14 18:24:02 +1000 | [diff] [blame] | 178 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 179 | return -EFBIG; |
Nathan Scott | 4cc929e | 2007-05-14 18:24:02 +1000 | [diff] [blame] | 180 | return 0; |
| 181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 183 | int |
Nathan Scott | c11e2c3 | 2005-11-02 15:11:45 +1100 | [diff] [blame] | 184 | xfs_initialize_perag( |
Nathan Scott | c11e2c3 | 2005-11-02 15:11:45 +1100 | [diff] [blame] | 185 | xfs_mount_t *mp, |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 186 | xfs_agnumber_t agcount, |
| 187 | xfs_agnumber_t *maxagi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
Carlos Maiolino | 2d2194f | 2012-09-20 10:32:38 -0300 | [diff] [blame] | 189 | xfs_agnumber_t index; |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 190 | xfs_agnumber_t first_initialised = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | xfs_perag_t *pag; |
| 192 | xfs_agino_t agino; |
| 193 | xfs_ino_t ino; |
| 194 | xfs_sb_t *sbp = &mp->m_sb; |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 195 | int error = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 197 | /* |
| 198 | * Walk the current per-ag tree so we don't try to initialise AGs |
| 199 | * that already exist (growfs case). Allocate and insert all the |
| 200 | * AGs we don't find ready for initialisation. |
| 201 | */ |
| 202 | for (index = 0; index < agcount; index++) { |
| 203 | pag = xfs_perag_get(mp, index); |
| 204 | if (pag) { |
| 205 | xfs_perag_put(pag); |
| 206 | continue; |
| 207 | } |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 208 | if (!first_initialised) |
| 209 | first_initialised = index; |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 210 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 211 | pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL); |
| 212 | if (!pag) |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 213 | goto out_unwind; |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 214 | pag->pag_agno = index; |
| 215 | pag->pag_mount = mp; |
Dave Chinner | 1a427ab | 2010-12-16 17:08:41 +1100 | [diff] [blame] | 216 | spin_lock_init(&pag->pag_ici_lock); |
Dave Chinner | 69b491c | 2010-09-27 11:09:51 +1000 | [diff] [blame] | 217 | mutex_init(&pag->pag_ici_reclaim_lock); |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 218 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 219 | spin_lock_init(&pag->pag_buf_lock); |
| 220 | pag->pag_buf_tree = RB_ROOT; |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 221 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 222 | if (radix_tree_preload(GFP_NOFS)) |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 223 | goto out_unwind; |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 224 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 225 | spin_lock(&mp->m_perag_lock); |
| 226 | if (radix_tree_insert(&mp->m_perag_tree, index, pag)) { |
| 227 | BUG(); |
| 228 | spin_unlock(&mp->m_perag_lock); |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 229 | radix_tree_preload_end(); |
| 230 | error = -EEXIST; |
| 231 | goto out_unwind; |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 232 | } |
| 233 | spin_unlock(&mp->m_perag_lock); |
| 234 | radix_tree_preload_end(); |
| 235 | } |
| 236 | |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 237 | /* |
| 238 | * If we mount with the inode64 option, or no inode overflows |
| 239 | * the legacy 32-bit address space clear the inode32 option. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | */ |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 241 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); |
| 242 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 244 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32) |
| 245 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
| 246 | else |
| 247 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; |
| 248 | |
Carlos Maiolino | 2d2194f | 2012-09-20 10:32:38 -0300 | [diff] [blame] | 249 | if (mp->m_flags & XFS_MOUNT_32BITINODES) |
Eric Sandeen | 9de67c3 | 2014-07-24 20:51:54 +1000 | [diff] [blame] | 250 | index = xfs_set_inode32(mp, agcount); |
Carlos Maiolino | 2d2194f | 2012-09-20 10:32:38 -0300 | [diff] [blame] | 251 | else |
Eric Sandeen | 9de67c3 | 2014-07-24 20:51:54 +1000 | [diff] [blame] | 252 | index = xfs_set_inode64(mp, agcount); |
Christoph Hellwig | fb3b504 | 2010-05-28 19:03:10 +0000 | [diff] [blame] | 253 | |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 254 | if (maxagi) |
| 255 | *maxagi = index; |
| 256 | return 0; |
Dave Chinner | 8b26c58 | 2010-01-11 11:47:48 +0000 | [diff] [blame] | 257 | |
| 258 | out_unwind: |
| 259 | kmem_free(pag); |
| 260 | for (; index > first_initialised; index--) { |
| 261 | pag = radix_tree_delete(&mp->m_perag_tree, index); |
| 262 | kmem_free(pag); |
| 263 | } |
| 264 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | /* |
| 268 | * xfs_readsb |
| 269 | * |
| 270 | * Does the initial read of the superblock. |
| 271 | */ |
| 272 | int |
Dave Chinner | ff55068 | 2013-08-12 20:49:41 +1000 | [diff] [blame] | 273 | xfs_readsb( |
| 274 | struct xfs_mount *mp, |
| 275 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
| 277 | unsigned int sector_size; |
Dave Chinner | 04a1e6c | 2013-04-03 16:11:31 +1100 | [diff] [blame] | 278 | struct xfs_buf *bp; |
| 279 | struct xfs_sb *sbp = &mp->m_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | int error; |
Dave Chinner | af34e09 | 2011-03-07 10:04:35 +1100 | [diff] [blame] | 281 | int loud = !(flags & XFS_MFSI_QUIET); |
Eric Sandeen | daba542 | 2014-02-19 15:39:16 +1100 | [diff] [blame] | 282 | const struct xfs_buf_ops *buf_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | ASSERT(mp->m_sb_bp == NULL); |
| 285 | ASSERT(mp->m_ddev_targp != NULL); |
| 286 | |
| 287 | /* |
Eric Sandeen | daba542 | 2014-02-19 15:39:16 +1100 | [diff] [blame] | 288 | * For the initial read, we must guess at the sector |
| 289 | * size based on the block device. It's enough to |
| 290 | * get the sb_sectsize out of the superblock and |
| 291 | * then reread with the proper length. |
| 292 | * We don't verify it yet, because it may not be complete. |
| 293 | */ |
| 294 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); |
| 295 | buf_ops = NULL; |
| 296 | |
| 297 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | * Allocate a (locked) buffer to hold the superblock. |
| 299 | * This will be kept around at all times to optimize |
| 300 | * access to the superblock. |
| 301 | */ |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 302 | reread: |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 303 | error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR, |
| 304 | BTOBB(sector_size), 0, &bp, buf_ops); |
| 305 | if (error) { |
Dave Chinner | eab4e63 | 2012-11-12 22:54:02 +1100 | [diff] [blame] | 306 | if (loud) |
Dave Chinner | e721f50 | 2013-04-03 16:11:32 +1100 | [diff] [blame] | 307 | xfs_warn(mp, "SB validate failed with error %d.", error); |
Dave Chinner | ac75a1f | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 308 | /* bad CRC means corrupted metadata */ |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 309 | if (error == -EFSBADCRC) |
| 310 | error = -EFSCORRUPTED; |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 311 | return error; |
Dave Chinner | eab4e63 | 2012-11-12 22:54:02 +1100 | [diff] [blame] | 312 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | /* |
| 315 | * Initialize the mount structure from the superblock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | */ |
Dave Chinner | 556b888 | 2014-06-06 16:00:43 +1000 | [diff] [blame] | 317 | xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp)); |
Dave Chinner | 556b888 | 2014-06-06 16:00:43 +1000 | [diff] [blame] | 318 | |
| 319 | /* |
| 320 | * If we haven't validated the superblock, do so now before we try |
| 321 | * to check the sector size and reread the superblock appropriately. |
| 322 | */ |
| 323 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { |
| 324 | if (loud) |
| 325 | xfs_warn(mp, "Invalid superblock magic number"); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 326 | error = -EINVAL; |
Dave Chinner | 556b888 | 2014-06-06 16:00:43 +1000 | [diff] [blame] | 327 | goto release_buf; |
| 328 | } |
Dave Chinner | ff55068 | 2013-08-12 20:49:41 +1000 | [diff] [blame] | 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* |
| 331 | * We must be able to do sector-sized and sector-aligned IO. |
| 332 | */ |
Dave Chinner | 04a1e6c | 2013-04-03 16:11:31 +1100 | [diff] [blame] | 333 | if (sector_size > sbp->sb_sectsize) { |
Dave Chinner | af34e09 | 2011-03-07 10:04:35 +1100 | [diff] [blame] | 334 | if (loud) |
| 335 | xfs_warn(mp, "device supports %u byte sectors (not %u)", |
Dave Chinner | 04a1e6c | 2013-04-03 16:11:31 +1100 | [diff] [blame] | 336 | sector_size, sbp->sb_sectsize); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 337 | error = -ENOSYS; |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 338 | goto release_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
| 340 | |
Eric Sandeen | daba542 | 2014-02-19 15:39:16 +1100 | [diff] [blame] | 341 | if (buf_ops == NULL) { |
Dave Chinner | 556b888 | 2014-06-06 16:00:43 +1000 | [diff] [blame] | 342 | /* |
| 343 | * Re-read the superblock so the buffer is correctly sized, |
| 344 | * and properly verified. |
| 345 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | xfs_buf_relse(bp); |
Dave Chinner | 04a1e6c | 2013-04-03 16:11:31 +1100 | [diff] [blame] | 347 | sector_size = sbp->sb_sectsize; |
Eric Sandeen | daba542 | 2014-02-19 15:39:16 +1100 | [diff] [blame] | 348 | buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops; |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 349 | goto reread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | |
Lachlan McIlroy | 5478eea | 2007-02-10 18:36:29 +1100 | [diff] [blame] | 352 | /* Initialize per-cpu counters */ |
| 353 | xfs_icsb_reinit_counters(mp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 354 | |
Dave Chinner | 04a1e6c | 2013-04-03 16:11:31 +1100 | [diff] [blame] | 355 | /* no need to be quiet anymore, so reset the buf ops */ |
| 356 | bp->b_ops = &xfs_sb_buf_ops; |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | mp->m_sb_bp = bp; |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 359 | xfs_buf_unlock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | return 0; |
| 361 | |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 362 | release_buf: |
| 363 | xfs_buf_relse(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | return error; |
| 365 | } |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /* |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 368 | * Update alignment values based on mount options and sb values |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | */ |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 370 | STATIC int |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 371 | xfs_update_alignment(xfs_mount_t *mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | xfs_sb_t *sbp = &(mp->m_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Christoph Hellwig | 4249023 | 2008-08-13 16:49:32 +1000 | [diff] [blame] | 375 | if (mp->m_dalign) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | /* |
| 377 | * If stripe unit and stripe width are not multiples |
| 378 | * of the fs blocksize turn off alignment. |
| 379 | */ |
| 380 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || |
| 381 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { |
Jie Liu | 39a45d8 | 2013-05-02 19:27:47 +0800 | [diff] [blame] | 382 | xfs_warn(mp, |
| 383 | "alignment check failed: sunit/swidth vs. blocksize(%d)", |
| 384 | sbp->sb_blocksize); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 385 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } else { |
| 387 | /* |
| 388 | * Convert the stripe unit and width to FSBs. |
| 389 | */ |
| 390 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); |
| 391 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { |
Dave Chinner | 5348778 | 2011-03-07 10:05:35 +1100 | [diff] [blame] | 392 | xfs_warn(mp, |
Jie Liu | 39a45d8 | 2013-05-02 19:27:47 +0800 | [diff] [blame] | 393 | "alignment check failed: sunit/swidth vs. agsize(%d)", |
| 394 | sbp->sb_agblocks); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 395 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } else if (mp->m_dalign) { |
| 397 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); |
| 398 | } else { |
Jie Liu | 39a45d8 | 2013-05-02 19:27:47 +0800 | [diff] [blame] | 399 | xfs_warn(mp, |
| 400 | "alignment check failed: sunit(%d) less than bsize(%d)", |
| 401 | mp->m_dalign, sbp->sb_blocksize); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 402 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Update superblock with new values |
| 408 | * and log changes |
| 409 | */ |
Eric Sandeen | 6211870 | 2008-03-06 13:44:28 +1100 | [diff] [blame] | 410 | if (xfs_sb_version_hasdalign(sbp)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | if (sbp->sb_unit != mp->m_dalign) { |
| 412 | sbp->sb_unit = mp->m_dalign; |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 413 | mp->m_update_flags |= XFS_SB_UNIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
| 415 | if (sbp->sb_width != mp->m_swidth) { |
| 416 | sbp->sb_width = mp->m_swidth; |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 417 | mp->m_update_flags |= XFS_SB_WIDTH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
Jie Liu | 34d7f60 | 2013-05-02 19:27:53 +0800 | [diff] [blame] | 419 | } else { |
| 420 | xfs_warn(mp, |
| 421 | "cannot change alignment: superblock does not support data alignment"); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 422 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
| 424 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && |
Eric Sandeen | 6211870 | 2008-03-06 13:44:28 +1100 | [diff] [blame] | 425 | xfs_sb_version_hasdalign(&mp->m_sb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | mp->m_dalign = sbp->sb_unit; |
| 427 | mp->m_swidth = sbp->sb_width; |
| 428 | } |
| 429 | |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Set the maximum inode count for this filesystem |
| 435 | */ |
| 436 | STATIC void |
| 437 | xfs_set_maxicount(xfs_mount_t *mp) |
| 438 | { |
| 439 | xfs_sb_t *sbp = &(mp->m_sb); |
| 440 | __uint64_t icount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | if (sbp->sb_imax_pct) { |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 443 | /* |
| 444 | * Make sure the maximum inode count is a multiple |
| 445 | * of the units we allocate inodes in. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; |
| 448 | do_div(icount, 100); |
| 449 | do_div(icount, mp->m_ialloc_blks); |
| 450 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << |
| 451 | sbp->sb_inopblog; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 452 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | mp->m_maxicount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 457 | /* |
| 458 | * Set the default minimum read and write sizes unless |
| 459 | * already specified in a mount option. |
| 460 | * We use smaller I/O sizes when the file system |
| 461 | * is being used for NFS service (wsync mount option). |
| 462 | */ |
| 463 | STATIC void |
| 464 | xfs_set_rw_sizes(xfs_mount_t *mp) |
| 465 | { |
| 466 | xfs_sb_t *sbp = &(mp->m_sb); |
| 467 | int readio_log, writeio_log; |
| 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
| 470 | if (mp->m_flags & XFS_MOUNT_WSYNC) { |
| 471 | readio_log = XFS_WSYNC_READIO_LOG; |
| 472 | writeio_log = XFS_WSYNC_WRITEIO_LOG; |
| 473 | } else { |
| 474 | readio_log = XFS_READIO_LOG_LARGE; |
| 475 | writeio_log = XFS_WRITEIO_LOG_LARGE; |
| 476 | } |
| 477 | } else { |
| 478 | readio_log = mp->m_readio_log; |
| 479 | writeio_log = mp->m_writeio_log; |
| 480 | } |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | if (sbp->sb_blocklog > readio_log) { |
| 483 | mp->m_readio_log = sbp->sb_blocklog; |
| 484 | } else { |
| 485 | mp->m_readio_log = readio_log; |
| 486 | } |
| 487 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); |
| 488 | if (sbp->sb_blocklog > writeio_log) { |
| 489 | mp->m_writeio_log = sbp->sb_blocklog; |
| 490 | } else { |
| 491 | mp->m_writeio_log = writeio_log; |
| 492 | } |
| 493 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 494 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 496 | /* |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 497 | * precalculate the low space thresholds for dynamic speculative preallocation. |
| 498 | */ |
| 499 | void |
| 500 | xfs_set_low_space_thresholds( |
| 501 | struct xfs_mount *mp) |
| 502 | { |
| 503 | int i; |
| 504 | |
| 505 | for (i = 0; i < XFS_LOWSP_MAX; i++) { |
| 506 | __uint64_t space = mp->m_sb.sb_dblocks; |
| 507 | |
| 508 | do_div(space, 100); |
| 509 | mp->m_low_space[i] = space * (i + 1); |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | |
| 514 | /* |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 515 | * Set whether we're using inode alignment. |
| 516 | */ |
| 517 | STATIC void |
| 518 | xfs_set_inoalignment(xfs_mount_t *mp) |
| 519 | { |
Eric Sandeen | 6211870 | 2008-03-06 13:44:28 +1100 | [diff] [blame] | 520 | if (xfs_sb_version_hasalign(&mp->m_sb) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | mp->m_sb.sb_inoalignmt >= |
| 522 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) |
| 523 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; |
| 524 | else |
| 525 | mp->m_inoalign_mask = 0; |
| 526 | /* |
| 527 | * If we are using stripe alignment, check whether |
| 528 | * the stripe unit is a multiple of the inode alignment |
| 529 | */ |
| 530 | if (mp->m_dalign && mp->m_inoalign_mask && |
| 531 | !(mp->m_dalign & mp->m_inoalign_mask)) |
| 532 | mp->m_sinoalign = mp->m_dalign; |
| 533 | else |
| 534 | mp->m_sinoalign = 0; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | /* |
Zhi Yong Wu | 0471f62 | 2013-08-07 10:10:58 +0000 | [diff] [blame] | 538 | * Check that the data (and log if separate) is an ok size. |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 539 | */ |
| 540 | STATIC int |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 541 | xfs_check_sizes( |
| 542 | struct xfs_mount *mp) |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 543 | { |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 544 | struct xfs_buf *bp; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 545 | xfs_daddr_t d; |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 546 | int error; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
| 549 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 550 | xfs_warn(mp, "filesystem size mismatch detected"); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 551 | return -EFBIG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 553 | error = xfs_buf_read_uncached(mp->m_ddev_targp, |
Dave Chinner | 1922c94 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 554 | d - XFS_FSS_TO_BB(mp, 1), |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 555 | XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); |
| 556 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 557 | xfs_warn(mp, "last sector read failed"); |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 558 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
Dave Chinner | 1922c94 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 560 | xfs_buf_relse(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 562 | if (mp->m_logdev_targp == mp->m_ddev_targp) |
| 563 | return 0; |
| 564 | |
| 565 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); |
| 566 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { |
| 567 | xfs_warn(mp, "log size mismatch detected"); |
| 568 | return -EFBIG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | } |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 570 | error = xfs_buf_read_uncached(mp->m_logdev_targp, |
| 571 | d - XFS_FSB_TO_BB(mp, 1), |
| 572 | XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL); |
| 573 | if (error) { |
| 574 | xfs_warn(mp, "log device read failed"); |
| 575 | return error; |
| 576 | } |
| 577 | xfs_buf_relse(bp); |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | /* |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 582 | * Clear the quotaflags in memory and in the superblock. |
| 583 | */ |
| 584 | int |
| 585 | xfs_mount_reset_sbqflags( |
| 586 | struct xfs_mount *mp) |
| 587 | { |
| 588 | int error; |
| 589 | struct xfs_trans *tp; |
| 590 | |
| 591 | mp->m_qflags = 0; |
| 592 | |
| 593 | /* |
| 594 | * It is OK to look at sb_qflags here in mount path, |
| 595 | * without m_sb_lock. |
| 596 | */ |
| 597 | if (mp->m_sb.sb_qflags == 0) |
| 598 | return 0; |
| 599 | spin_lock(&mp->m_sb_lock); |
| 600 | mp->m_sb.sb_qflags = 0; |
| 601 | spin_unlock(&mp->m_sb_lock); |
| 602 | |
| 603 | /* |
| 604 | * If the fs is readonly, let the incore superblock run |
| 605 | * with quotas off but don't flush the update out to disk |
| 606 | */ |
| 607 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
| 608 | return 0; |
| 609 | |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 610 | tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE); |
Jie Liu | 3d3c8b5 | 2013-08-12 20:49:59 +1000 | [diff] [blame] | 611 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0); |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 612 | if (error) { |
| 613 | xfs_trans_cancel(tp, 0); |
Dave Chinner | 5348778 | 2011-03-07 10:05:35 +1100 | [diff] [blame] | 614 | xfs_alert(mp, "%s: Superblock update failed!", __func__); |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 615 | return error; |
| 616 | } |
| 617 | |
| 618 | xfs_mod_sb(tp, XFS_SB_QFLAGS); |
| 619 | return xfs_trans_commit(tp, 0); |
| 620 | } |
| 621 | |
Eric Sandeen | d5db0f9 | 2010-02-05 22:59:53 +0000 | [diff] [blame] | 622 | __uint64_t |
| 623 | xfs_default_resblks(xfs_mount_t *mp) |
| 624 | { |
| 625 | __uint64_t resblks; |
| 626 | |
| 627 | /* |
Dave Chinner | 8babd8a | 2010-03-04 01:46:25 +0000 | [diff] [blame] | 628 | * We default to 5% or 8192 fsbs of space reserved, whichever is |
| 629 | * smaller. This is intended to cover concurrent allocation |
| 630 | * transactions when we initially hit enospc. These each require a 4 |
| 631 | * block reservation. Hence by default we cover roughly 2000 concurrent |
| 632 | * allocation reservations. |
Eric Sandeen | d5db0f9 | 2010-02-05 22:59:53 +0000 | [diff] [blame] | 633 | */ |
| 634 | resblks = mp->m_sb.sb_dblocks; |
| 635 | do_div(resblks, 20); |
Dave Chinner | 8babd8a | 2010-03-04 01:46:25 +0000 | [diff] [blame] | 636 | resblks = min_t(__uint64_t, resblks, 8192); |
Eric Sandeen | d5db0f9 | 2010-02-05 22:59:53 +0000 | [diff] [blame] | 637 | return resblks; |
| 638 | } |
| 639 | |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 640 | /* |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 641 | * This function does the following on an initial mount of a file system: |
| 642 | * - reads the superblock from disk and init the mount struct |
| 643 | * - if we're a 32-bit kernel, do a size check on the superblock |
| 644 | * so we don't mount terabyte filesystems |
| 645 | * - init mount struct realtime fields |
| 646 | * - allocate inode hash table for fs |
| 647 | * - init directory manager |
| 648 | * - perform recovery and init the log manager |
| 649 | */ |
| 650 | int |
| 651 | xfs_mountfs( |
Christoph Hellwig | 4249023 | 2008-08-13 16:49:32 +1000 | [diff] [blame] | 652 | xfs_mount_t *mp) |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 653 | { |
| 654 | xfs_sb_t *sbp = &(mp->m_sb); |
| 655 | xfs_inode_t *rip; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 656 | __uint64_t resblks; |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 657 | uint quotamount = 0; |
| 658 | uint quotaflags = 0; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 659 | int error = 0; |
| 660 | |
Dave Chinner | ff55068 | 2013-08-12 20:49:41 +1000 | [diff] [blame] | 661 | xfs_sb_mount_common(mp, sbp); |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 662 | |
| 663 | /* |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 664 | * Check for a mismatched features2 values. Older kernels |
| 665 | * read & wrote into the wrong sb offset for sb_features2 |
| 666 | * on some platforms due to xfs_sb_t not being 64bit size aligned |
| 667 | * when sb_features2 was added, which made older superblock |
| 668 | * reading/writing routines swap it as a 64-bit value. |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 669 | * |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 670 | * For backwards compatibility, we make both slots equal. |
| 671 | * |
| 672 | * If we detect a mismatched field, we OR the set bits into the |
| 673 | * existing features2 field in case it has already been modified; we |
| 674 | * don't want to lose any features. We then update the bad location |
| 675 | * with the ORed value so that older kernels will see any features2 |
| 676 | * flags, and mark the two fields as needing updates once the |
| 677 | * transaction subsystem is online. |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 678 | */ |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 679 | if (xfs_sb_has_mismatched_features2(sbp)) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 680 | xfs_warn(mp, "correcting sb_features alignment problem"); |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 681 | sbp->sb_features2 |= sbp->sb_bad_features2; |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 682 | sbp->sb_bad_features2 = sbp->sb_features2; |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 683 | mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2; |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 684 | |
| 685 | /* |
| 686 | * Re-check for ATTR2 in case it was found in bad_features2 |
| 687 | * slot. |
| 688 | */ |
Tim Shimmin | 7c12f29 | 2008-04-30 18:15:28 +1000 | [diff] [blame] | 689 | if (xfs_sb_version_hasattr2(&mp->m_sb) && |
| 690 | !(mp->m_flags & XFS_MOUNT_NOATTR2)) |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 691 | mp->m_flags |= XFS_MOUNT_ATTR2; |
Tim Shimmin | 7c12f29 | 2008-04-30 18:15:28 +1000 | [diff] [blame] | 692 | } |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 693 | |
Tim Shimmin | 7c12f29 | 2008-04-30 18:15:28 +1000 | [diff] [blame] | 694 | if (xfs_sb_version_hasattr2(&mp->m_sb) && |
| 695 | (mp->m_flags & XFS_MOUNT_NOATTR2)) { |
| 696 | xfs_sb_version_removeattr2(&mp->m_sb); |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 697 | mp->m_update_flags |= XFS_SB_FEATURES2; |
Tim Shimmin | 7c12f29 | 2008-04-30 18:15:28 +1000 | [diff] [blame] | 698 | |
| 699 | /* update sb_versionnum for the clearing of the morebits */ |
| 700 | if (!sbp->sb_features2) |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 701 | mp->m_update_flags |= XFS_SB_VERSIONNUM; |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 702 | } |
| 703 | |
Dave Chinner | 263997a | 2014-05-20 07:46:40 +1000 | [diff] [blame] | 704 | /* always use v2 inodes by default now */ |
| 705 | if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) { |
| 706 | mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT; |
| 707 | mp->m_update_flags |= XFS_SB_VERSIONNUM; |
| 708 | } |
| 709 | |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 710 | /* |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 711 | * Check if sb_agblocks is aligned at stripe boundary |
| 712 | * If sb_agblocks is NOT aligned turn off m_dalign since |
| 713 | * allocator alignment is within an ag, therefore ag has |
| 714 | * to be aligned at stripe boundary. |
| 715 | */ |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 716 | error = xfs_update_alignment(mp); |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 717 | if (error) |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 718 | goto out; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 719 | |
| 720 | xfs_alloc_compute_maxlevels(mp); |
| 721 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); |
| 722 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); |
| 723 | xfs_ialloc_compute_maxlevels(mp); |
| 724 | |
| 725 | xfs_set_maxicount(mp); |
| 726 | |
Brian Foster | a31b1d3 | 2014-07-15 08:07:01 +1000 | [diff] [blame] | 727 | error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype, NULL, mp->m_fsname); |
Christoph Hellwig | 2717420 | 2009-03-30 10:21:31 +0200 | [diff] [blame] | 728 | if (error) |
| 729 | goto out; |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 730 | |
Brian Foster | a31b1d3 | 2014-07-15 08:07:01 +1000 | [diff] [blame] | 731 | error = xfs_uuid_mount(mp); |
| 732 | if (error) |
| 733 | goto out_remove_sysfs; |
| 734 | |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 735 | /* |
| 736 | * Set the minimum read and write sizes |
| 737 | */ |
| 738 | xfs_set_rw_sizes(mp); |
| 739 | |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 740 | /* set the low space thresholds for dynamic preallocation */ |
| 741 | xfs_set_low_space_thresholds(mp); |
| 742 | |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 743 | /* |
| 744 | * Set the inode cluster size. |
| 745 | * This may still be overridden by the file system |
| 746 | * block size if it is larger than the chosen cluster size. |
Dave Chinner | 8f80587 | 2013-11-01 15:27:20 +1100 | [diff] [blame] | 747 | * |
| 748 | * For v5 filesystems, scale the cluster size with the inode size to |
| 749 | * keep a constant ratio of inode per cluster buffer, but only if mkfs |
| 750 | * has set the inode alignment value appropriately for larger cluster |
| 751 | * sizes. |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 752 | */ |
| 753 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; |
Dave Chinner | 8f80587 | 2013-11-01 15:27:20 +1100 | [diff] [blame] | 754 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| 755 | int new_size = mp->m_inode_cluster_size; |
| 756 | |
| 757 | new_size *= mp->m_sb.sb_inodesize / XFS_DINODE_MIN_SIZE; |
| 758 | if (mp->m_sb.sb_inoalignmt >= XFS_B_TO_FSBT(mp, new_size)) |
| 759 | mp->m_inode_cluster_size = new_size; |
Dave Chinner | 8f80587 | 2013-11-01 15:27:20 +1100 | [diff] [blame] | 760 | } |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 761 | |
| 762 | /* |
| 763 | * Set inode alignment fields |
| 764 | */ |
| 765 | xfs_set_inoalignment(mp); |
| 766 | |
| 767 | /* |
Zhi Yong Wu | c2bfbc9 | 2013-08-12 03:15:03 +0000 | [diff] [blame] | 768 | * Check that the data (and log if separate) is an ok size. |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 769 | */ |
Christoph Hellwig | 4249023 | 2008-08-13 16:49:32 +1000 | [diff] [blame] | 770 | error = xfs_check_sizes(mp); |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 771 | if (error) |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 772 | goto out_remove_uuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | /* |
| 775 | * Initialize realtime fields in the mount structure |
| 776 | */ |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 777 | error = xfs_rtmount_init(mp); |
| 778 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 779 | xfs_warn(mp, "RT mount failed"); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 780 | goto out_remove_uuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
| 783 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | * Copies the low order bits of the timestamp and the randomly |
| 785 | * set "sequence" number out of a UUID. |
| 786 | */ |
| 787 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); |
| 788 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
| 790 | |
Dave Chinner | 0650b55 | 2014-06-06 15:01:58 +1000 | [diff] [blame] | 791 | error = xfs_da_mount(mp); |
| 792 | if (error) { |
| 793 | xfs_warn(mp, "Failed dir/attr init: %d", error); |
| 794 | goto out_remove_uuid; |
| 795 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | /* |
| 798 | * Initialize the precomputed transaction reservations values. |
| 799 | */ |
| 800 | xfs_trans_init(mp); |
| 801 | |
| 802 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | * Allocate and initialize the per-ag data. |
| 804 | */ |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 805 | spin_lock_init(&mp->m_perag_lock); |
Dave Chinner | 9b98b6f | 2010-05-27 01:58:13 +0000 | [diff] [blame] | 806 | INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC); |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 807 | error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi); |
| 808 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 809 | xfs_warn(mp, "Failed per-ag init: %d", error); |
Dave Chinner | 0650b55 | 2014-06-06 15:01:58 +1000 | [diff] [blame] | 810 | goto out_free_dir; |
Dave Chinner | 1c1c6eb | 2010-01-11 11:47:44 +0000 | [diff] [blame] | 811 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 813 | if (!sbp->sb_logblocks) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 814 | xfs_warn(mp, "no log defined"); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 815 | XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 816 | error = -EFSCORRUPTED; |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 817 | goto out_free_perag; |
| 818 | } |
| 819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | /* |
| 821 | * log's mount-time initialization. Perform 1st part recovery if needed |
| 822 | */ |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 823 | error = xfs_log_mount(mp, mp->m_logdev_targp, |
| 824 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), |
| 825 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); |
| 826 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 827 | xfs_warn(mp, "log mount failed"); |
Dave Chinner | d4f3512 | 2012-04-23 15:59:06 +1000 | [diff] [blame] | 828 | goto out_fail_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | /* |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 832 | * Now the log is mounted, we know if it was an unclean shutdown or |
| 833 | * not. If it was, with the first phase of recovery has completed, we |
| 834 | * have consistent AG blocks on disk. We have not recovered EFIs yet, |
| 835 | * but they are recovered transactionally in the second recovery phase |
| 836 | * later. |
| 837 | * |
| 838 | * Hence we can safely re-initialise incore superblock counters from |
| 839 | * the per-ag data. These may not be correct if the filesystem was not |
| 840 | * cleanly unmounted, so we need to wait for recovery to finish before |
| 841 | * doing this. |
| 842 | * |
| 843 | * If the filesystem was cleanly unmounted, then we can trust the |
| 844 | * values in the superblock to be correct and we don't need to do |
| 845 | * anything here. |
| 846 | * |
| 847 | * If we are currently making the filesystem, the initialisation will |
| 848 | * fail as the perag data is in an undefined state. |
| 849 | */ |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 850 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
| 851 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && |
| 852 | !mp->m_sb.sb_inprogress) { |
| 853 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 854 | if (error) |
kbuild test robot | 6eee897 | 2014-08-04 13:49:40 +1000 | [diff] [blame] | 855 | goto out_log_dealloc; |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 856 | } |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 857 | |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 858 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | * Get and sanity-check the root inode. |
| 860 | * Save the pointer to it in the mount structure. |
| 861 | */ |
Dave Chinner | 7b6259e | 2010-06-24 11:35:17 +1000 | [diff] [blame] | 862 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 864 | xfs_warn(mp, "failed to read root inode"); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 865 | goto out_log_dealloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | ASSERT(rip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Al Viro | abbede1 | 2011-07-26 02:31:30 -0400 | [diff] [blame] | 870 | if (unlikely(!S_ISDIR(rip->i_d.di_mode))) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 871 | xfs_warn(mp, "corrupted root inode %llu: not a directory", |
Nathan Scott | b657452 | 2006-06-09 15:29:40 +1000 | [diff] [blame] | 872 | (unsigned long long)rip->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
| 874 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, |
| 875 | mp); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 876 | error = -EFSCORRUPTED; |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 877 | goto out_rele_rip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | } |
| 879 | mp->m_rootip = rip; /* save it */ |
| 880 | |
| 881 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
| 882 | |
| 883 | /* |
| 884 | * Initialize realtime inode pointers in the mount structure |
| 885 | */ |
Eric Sandeen | 0771fb4 | 2007-10-12 11:03:40 +1000 | [diff] [blame] | 886 | error = xfs_rtmount_inodes(mp); |
| 887 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | /* |
| 889 | * Free up the root inode. |
| 890 | */ |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 891 | xfs_warn(mp, "failed to read RT inodes"); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 892 | goto out_rele_rip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | /* |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 896 | * If this is a read-only mount defer the superblock updates until |
| 897 | * the next remount into writeable mode. Otherwise we would never |
| 898 | * perform the update e.g. for the root filesystem. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | */ |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 900 | if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) { |
| 901 | error = xfs_mount_log_sb(mp, mp->m_update_flags); |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 902 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 903 | xfs_warn(mp, "failed to write sb changes"); |
Christoph Hellwig | b93b6e4 | 2009-02-04 09:33:58 +0100 | [diff] [blame] | 904 | goto out_rtunmount; |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 905 | } |
| 906 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | /* |
| 909 | * Initialise the XFS quota management subsystem for this mount |
| 910 | */ |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 911 | if (XFS_IS_QUOTA_RUNNING(mp)) { |
| 912 | error = xfs_qm_newmount(mp, "amount, "aflags); |
| 913 | if (error) |
| 914 | goto out_rtunmount; |
| 915 | } else { |
| 916 | ASSERT(!XFS_IS_QUOTA_ON(mp)); |
| 917 | |
| 918 | /* |
| 919 | * If a file system had quotas running earlier, but decided to |
| 920 | * mount without -o uquota/pquota/gquota options, revoke the |
| 921 | * quotachecked license. |
| 922 | */ |
| 923 | if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 924 | xfs_notice(mp, "resetting quota flags"); |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 925 | error = xfs_mount_reset_sbqflags(mp); |
| 926 | if (error) |
Brian Foster | a70a4fa | 2014-07-15 07:41:25 +1000 | [diff] [blame] | 927 | goto out_rtunmount; |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 928 | } |
| 929 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
| 931 | /* |
| 932 | * Finish recovering the file system. This part needed to be |
| 933 | * delayed until after the root and real-time bitmap inodes |
| 934 | * were consistently read in. |
| 935 | */ |
Christoph Hellwig | 4249023 | 2008-08-13 16:49:32 +1000 | [diff] [blame] | 936 | error = xfs_log_mount_finish(mp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | if (error) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 938 | xfs_warn(mp, "log mount finish failed"); |
Christoph Hellwig | b93b6e4 | 2009-02-04 09:33:58 +0100 | [diff] [blame] | 939 | goto out_rtunmount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | /* |
| 943 | * Complete the quota initialisation, post-log-replay component. |
| 944 | */ |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 945 | if (quotamount) { |
| 946 | ASSERT(mp->m_qflags == 0); |
| 947 | mp->m_qflags = quotaflags; |
| 948 | |
| 949 | xfs_qm_mount_quotas(mp); |
| 950 | } |
| 951 | |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 952 | /* |
| 953 | * Now we are mounted, reserve a small amount of unused space for |
| 954 | * privileged transactions. This is needed so that transaction |
| 955 | * space required for critical operations can dip into this pool |
| 956 | * when at ENOSPC. This is needed for operations like create with |
| 957 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations |
| 958 | * are not allowed to use this reserved space. |
Dave Chinner | 8babd8a | 2010-03-04 01:46:25 +0000 | [diff] [blame] | 959 | * |
| 960 | * This may drive us straight to ENOSPC on mount, but that implies |
| 961 | * we were already there on the last unmount. Warn if this occurs. |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 962 | */ |
Eric Sandeen | d5db0f9 | 2010-02-05 22:59:53 +0000 | [diff] [blame] | 963 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { |
| 964 | resblks = xfs_default_resblks(mp); |
| 965 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
| 966 | if (error) |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 967 | xfs_warn(mp, |
| 968 | "Unable to allocate reserve blocks. Continuing without reserve pool."); |
Eric Sandeen | d5db0f9 | 2010-02-05 22:59:53 +0000 | [diff] [blame] | 969 | } |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | return 0; |
| 972 | |
Christoph Hellwig | b93b6e4 | 2009-02-04 09:33:58 +0100 | [diff] [blame] | 973 | out_rtunmount: |
| 974 | xfs_rtunmount_inodes(mp); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 975 | out_rele_rip: |
Christoph Hellwig | 4335509 | 2008-03-27 18:01:08 +1100 | [diff] [blame] | 976 | IRELE(rip); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 977 | out_log_dealloc: |
Christoph Hellwig | 21b699c | 2009-03-16 08:19:29 +0100 | [diff] [blame] | 978 | xfs_log_unmount(mp); |
Dave Chinner | d4f3512 | 2012-04-23 15:59:06 +1000 | [diff] [blame] | 979 | out_fail_wait: |
| 980 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) |
| 981 | xfs_wait_buftarg(mp->m_logdev_targp); |
| 982 | xfs_wait_buftarg(mp->m_ddev_targp); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 983 | out_free_perag: |
Christoph Hellwig | ff4f038 | 2008-08-13 16:50:47 +1000 | [diff] [blame] | 984 | xfs_free_perag(mp); |
Dave Chinner | 0650b55 | 2014-06-06 15:01:58 +1000 | [diff] [blame] | 985 | out_free_dir: |
| 986 | xfs_da_unmount(mp); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 987 | out_remove_uuid: |
Christoph Hellwig | 2717420 | 2009-03-30 10:21:31 +0200 | [diff] [blame] | 988 | xfs_uuid_unmount(mp); |
Brian Foster | a31b1d3 | 2014-07-15 08:07:01 +1000 | [diff] [blame] | 989 | out_remove_sysfs: |
| 990 | xfs_sysfs_del(&mp->m_kobj); |
Christoph Hellwig | f9057e3 | 2009-02-04 09:31:52 +0100 | [diff] [blame] | 991 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | return error; |
| 993 | } |
| 994 | |
| 995 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | * This flushes out the inodes,dquots and the superblock, unmounts the |
| 997 | * log and makes sure that incore structures are freed. |
| 998 | */ |
Christoph Hellwig | 41b5c2e | 2008-08-13 16:49:57 +1000 | [diff] [blame] | 999 | void |
| 1000 | xfs_unmountfs( |
| 1001 | struct xfs_mount *mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | { |
Christoph Hellwig | 41b5c2e | 2008-08-13 16:49:57 +1000 | [diff] [blame] | 1003 | __uint64_t resblks; |
| 1004 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Brian Foster | 579b62f | 2012-11-06 09:50:47 -0500 | [diff] [blame] | 1006 | cancel_delayed_work_sync(&mp->m_eofblocks_work); |
| 1007 | |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 1008 | xfs_qm_unmount_quotas(mp); |
Christoph Hellwig | b93b6e4 | 2009-02-04 09:33:58 +0100 | [diff] [blame] | 1009 | xfs_rtunmount_inodes(mp); |
Christoph Hellwig | 77508ec | 2008-08-13 16:49:04 +1000 | [diff] [blame] | 1010 | IRELE(mp->m_rootip); |
| 1011 | |
David Chinner | 641c56f | 2007-06-18 16:50:17 +1000 | [diff] [blame] | 1012 | /* |
| 1013 | * We can potentially deadlock here if we have an inode cluster |
Malcolm Parsons | 9da096f | 2009-03-29 09:55:42 +0200 | [diff] [blame] | 1014 | * that has been freed has its buffer still pinned in memory because |
David Chinner | 641c56f | 2007-06-18 16:50:17 +1000 | [diff] [blame] | 1015 | * the transaction is still sitting in a iclog. The stale inodes |
| 1016 | * on that buffer will have their flush locks held until the |
| 1017 | * transaction hits the disk and the callbacks run. the inode |
| 1018 | * flush takes the flush lock unconditionally and with nothing to |
| 1019 | * push out the iclog we will never get that unlocked. hence we |
| 1020 | * need to force the log first. |
| 1021 | */ |
Christoph Hellwig | a14a348 | 2010-01-19 09:56:46 +0000 | [diff] [blame] | 1022 | xfs_log_force(mp, XFS_LOG_SYNC); |
Dave Chinner | c854363 | 2010-02-06 12:39:36 +1100 | [diff] [blame] | 1023 | |
| 1024 | /* |
Christoph Hellwig | 211e4d4 | 2012-04-23 15:58:34 +1000 | [diff] [blame] | 1025 | * Flush all pending changes from the AIL. |
Dave Chinner | c854363 | 2010-02-06 12:39:36 +1100 | [diff] [blame] | 1026 | */ |
Christoph Hellwig | 211e4d4 | 2012-04-23 15:58:34 +1000 | [diff] [blame] | 1027 | xfs_ail_push_all_sync(mp->m_ail); |
| 1028 | |
| 1029 | /* |
| 1030 | * And reclaim all inodes. At this point there should be no dirty |
Dave Chinner | 7e18530 | 2012-10-08 21:56:00 +1100 | [diff] [blame] | 1031 | * inodes and none should be pinned or locked, but use synchronous |
| 1032 | * reclaim just to be sure. We can stop background inode reclaim |
| 1033 | * here as well if it is still running. |
Christoph Hellwig | 211e4d4 | 2012-04-23 15:58:34 +1000 | [diff] [blame] | 1034 | */ |
Dave Chinner | 7e18530 | 2012-10-08 21:56:00 +1100 | [diff] [blame] | 1035 | cancel_delayed_work_sync(&mp->m_reclaim_work); |
Dave Chinner | c854363 | 2010-02-06 12:39:36 +1100 | [diff] [blame] | 1036 | xfs_reclaim_inodes(mp, SYNC_WAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 1038 | xfs_qm_unmount(mp); |
Lachlan McIlroy | a357a12 | 2008-10-30 16:53:25 +1100 | [diff] [blame] | 1039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | /* |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 1041 | * Unreserve any blocks we have so that when we unmount we don't account |
| 1042 | * the reserved free space as used. This is really only necessary for |
| 1043 | * lazy superblock counting because it trusts the incore superblock |
Malcolm Parsons | 9da096f | 2009-03-29 09:55:42 +0200 | [diff] [blame] | 1044 | * counters to be absolutely correct on clean unmount. |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 1045 | * |
| 1046 | * We don't bother correcting this elsewhere for lazy superblock |
| 1047 | * counting because on mount of an unclean filesystem we reconstruct the |
| 1048 | * correct counter value and this is irrelevant. |
| 1049 | * |
| 1050 | * For non-lazy counter filesystems, this doesn't matter at all because |
| 1051 | * we only every apply deltas to the superblock and hence the incore |
| 1052 | * value does not matter.... |
| 1053 | */ |
| 1054 | resblks = 0; |
David Chinner | 714082b | 2008-04-10 12:20:03 +1000 | [diff] [blame] | 1055 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
| 1056 | if (error) |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 1057 | xfs_warn(mp, "Unable to free reserved block pool. " |
David Chinner | 714082b | 2008-04-10 12:20:03 +1000 | [diff] [blame] | 1058 | "Freespace may not be correct on next mount."); |
| 1059 | |
Chandra Seetharaman | adab0f6 | 2011-06-29 22:10:14 +0000 | [diff] [blame] | 1060 | error = xfs_log_sbcount(mp); |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1061 | if (error) |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 1062 | xfs_warn(mp, "Unable to update superblock counters. " |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1063 | "Freespace may not be correct on next mount."); |
Christoph Hellwig | 87c7bec | 2011-09-14 14:08:26 +0000 | [diff] [blame] | 1064 | |
Christoph Hellwig | 21b699c | 2009-03-16 08:19:29 +0100 | [diff] [blame] | 1065 | xfs_log_unmount(mp); |
Dave Chinner | 0650b55 | 2014-06-06 15:01:58 +1000 | [diff] [blame] | 1066 | xfs_da_unmount(mp); |
Christoph Hellwig | 2717420 | 2009-03-30 10:21:31 +0200 | [diff] [blame] | 1067 | xfs_uuid_unmount(mp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
Christoph Hellwig | 1550d0b | 2008-08-13 16:17:37 +1000 | [diff] [blame] | 1069 | #if defined(DEBUG) |
Christoph Hellwig | 0ce4cfd | 2007-08-30 17:20:53 +1000 | [diff] [blame] | 1070 | xfs_errortag_clearall(mp, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | #endif |
Christoph Hellwig | ff4f038 | 2008-08-13 16:50:47 +1000 | [diff] [blame] | 1072 | xfs_free_perag(mp); |
Brian Foster | a31b1d3 | 2014-07-15 08:07:01 +1000 | [diff] [blame] | 1073 | |
| 1074 | xfs_sysfs_del(&mp->m_kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | } |
| 1076 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | int |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1078 | xfs_fs_writable(xfs_mount_t *mp) |
| 1079 | { |
Jan Kara | d9457dc | 2012-06-12 16:20:39 +0200 | [diff] [blame] | 1080 | return !(mp->m_super->s_writers.frozen || XFS_FORCED_SHUTDOWN(mp) || |
Christoph Hellwig | bd186aa | 2007-08-30 17:21:12 +1000 | [diff] [blame] | 1081 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1082 | } |
| 1083 | |
| 1084 | /* |
Alex Elder | b2ce397 | 2011-07-11 09:51:44 -0500 | [diff] [blame] | 1085 | * xfs_log_sbcount |
| 1086 | * |
Chandra Seetharaman | adab0f6 | 2011-06-29 22:10:14 +0000 | [diff] [blame] | 1087 | * Sync the superblock counters to disk. |
Alex Elder | b2ce397 | 2011-07-11 09:51:44 -0500 | [diff] [blame] | 1088 | * |
| 1089 | * Note this code can be called during the process of freezing, so |
Chandra Seetharaman | adab0f6 | 2011-06-29 22:10:14 +0000 | [diff] [blame] | 1090 | * we may need to use the transaction allocator which does not |
Alex Elder | b2ce397 | 2011-07-11 09:51:44 -0500 | [diff] [blame] | 1091 | * block when the transaction subsystem is in its frozen state. |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1092 | */ |
| 1093 | int |
Chandra Seetharaman | adab0f6 | 2011-06-29 22:10:14 +0000 | [diff] [blame] | 1094 | xfs_log_sbcount(xfs_mount_t *mp) |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1095 | { |
| 1096 | xfs_trans_t *tp; |
| 1097 | int error; |
| 1098 | |
| 1099 | if (!xfs_fs_writable(mp)) |
| 1100 | return 0; |
| 1101 | |
Christoph Hellwig | d4d90b5 | 2008-04-22 17:34:37 +1000 | [diff] [blame] | 1102 | xfs_icsb_sync_counters(mp, 0); |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1103 | |
| 1104 | /* |
| 1105 | * we don't need to do this if we are updating the superblock |
| 1106 | * counters on every modification. |
| 1107 | */ |
| 1108 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) |
| 1109 | return 0; |
| 1110 | |
Alex Elder | b2ce397 | 2011-07-11 09:51:44 -0500 | [diff] [blame] | 1111 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP); |
Jie Liu | 3d3c8b5 | 2013-08-12 20:49:59 +1000 | [diff] [blame] | 1112 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1113 | if (error) { |
| 1114 | xfs_trans_cancel(tp, 0); |
| 1115 | return error; |
| 1116 | } |
| 1117 | |
| 1118 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); |
Chandra Seetharaman | adab0f6 | 2011-06-29 22:10:14 +0000 | [diff] [blame] | 1119 | xfs_trans_set_sync(tp); |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1120 | error = xfs_trans_commit(tp, 0); |
| 1121 | return error; |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 1122 | } |
| 1123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | /* |
Zhi Yong Wu | 99e738b7 | 2013-08-07 10:11:01 +0000 | [diff] [blame] | 1125 | * xfs_mod_incore_sb_unlocked() is a utility routine commonly used to apply |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | * a delta to a specified field in the in-core superblock. Simply |
| 1127 | * switch on the field indicated and apply the delta to that field. |
| 1128 | * Fields are not allowed to dip below zero, so if the delta would |
| 1129 | * do this do not apply it and return EINVAL. |
| 1130 | * |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1131 | * The m_sb_lock must be held when this routine is called. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | */ |
Eric Sandeen | d96f8f8 | 2009-07-02 00:09:33 -0500 | [diff] [blame] | 1133 | STATIC int |
David Chinner | 20f4ebf | 2007-02-10 18:36:10 +1100 | [diff] [blame] | 1134 | xfs_mod_incore_sb_unlocked( |
| 1135 | xfs_mount_t *mp, |
| 1136 | xfs_sb_field_t field, |
| 1137 | int64_t delta, |
| 1138 | int rsvd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | { |
| 1140 | int scounter; /* short counter for 32 bit fields */ |
| 1141 | long long lcounter; /* long counter for 64 bit fields */ |
| 1142 | long long res_used, rem; |
| 1143 | |
| 1144 | /* |
| 1145 | * With the in-core superblock spin lock held, switch |
| 1146 | * on the indicated field. Apply the delta to the |
| 1147 | * proper field. If the fields value would dip below |
| 1148 | * 0, then do not apply the delta and return EINVAL. |
| 1149 | */ |
| 1150 | switch (field) { |
| 1151 | case XFS_SBS_ICOUNT: |
| 1152 | lcounter = (long long)mp->m_sb.sb_icount; |
| 1153 | lcounter += delta; |
| 1154 | if (lcounter < 0) { |
| 1155 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1156 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | } |
| 1158 | mp->m_sb.sb_icount = lcounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1159 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | case XFS_SBS_IFREE: |
| 1161 | lcounter = (long long)mp->m_sb.sb_ifree; |
| 1162 | lcounter += delta; |
| 1163 | if (lcounter < 0) { |
| 1164 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1165 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | } |
| 1167 | mp->m_sb.sb_ifree = lcounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1168 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | case XFS_SBS_FDBLOCKS: |
David Chinner | 4be536d | 2006-09-07 14:26:50 +1000 | [diff] [blame] | 1170 | lcounter = (long long) |
| 1171 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
| 1173 | |
| 1174 | if (delta > 0) { /* Putting blocks back */ |
| 1175 | if (res_used > delta) { |
| 1176 | mp->m_resblks_avail += delta; |
| 1177 | } else { |
| 1178 | rem = delta - res_used; |
| 1179 | mp->m_resblks_avail = mp->m_resblks; |
| 1180 | lcounter += rem; |
| 1181 | } |
| 1182 | } else { /* Taking blocks away */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | lcounter += delta; |
Dave Chinner | 8babd8a | 2010-03-04 01:46:25 +0000 | [diff] [blame] | 1184 | if (lcounter >= 0) { |
| 1185 | mp->m_sb.sb_fdblocks = lcounter + |
| 1186 | XFS_ALLOC_SET_ASIDE(mp); |
| 1187 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } |
Dave Chinner | 8babd8a | 2010-03-04 01:46:25 +0000 | [diff] [blame] | 1189 | |
| 1190 | /* |
| 1191 | * We are out of blocks, use any available reserved |
| 1192 | * blocks if were allowed to. |
| 1193 | */ |
| 1194 | if (!rsvd) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1195 | return -ENOSPC; |
Dave Chinner | 8babd8a | 2010-03-04 01:46:25 +0000 | [diff] [blame] | 1196 | |
| 1197 | lcounter = (long long)mp->m_resblks_avail + delta; |
| 1198 | if (lcounter >= 0) { |
| 1199 | mp->m_resblks_avail = lcounter; |
| 1200 | return 0; |
| 1201 | } |
| 1202 | printk_once(KERN_WARNING |
| 1203 | "Filesystem \"%s\": reserve blocks depleted! " |
| 1204 | "Consider increasing reserve pool size.", |
| 1205 | mp->m_fsname); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1206 | return -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | } |
| 1208 | |
David Chinner | 4be536d | 2006-09-07 14:26:50 +1000 | [diff] [blame] | 1209 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1210 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | case XFS_SBS_FREXTENTS: |
| 1212 | lcounter = (long long)mp->m_sb.sb_frextents; |
| 1213 | lcounter += delta; |
| 1214 | if (lcounter < 0) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1215 | return -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | } |
| 1217 | mp->m_sb.sb_frextents = lcounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1218 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | case XFS_SBS_DBLOCKS: |
| 1220 | lcounter = (long long)mp->m_sb.sb_dblocks; |
| 1221 | lcounter += delta; |
| 1222 | if (lcounter < 0) { |
| 1223 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1224 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | } |
| 1226 | mp->m_sb.sb_dblocks = lcounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1227 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | case XFS_SBS_AGCOUNT: |
| 1229 | scounter = mp->m_sb.sb_agcount; |
| 1230 | scounter += delta; |
| 1231 | if (scounter < 0) { |
| 1232 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1233 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | } |
| 1235 | mp->m_sb.sb_agcount = scounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1236 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | case XFS_SBS_IMAX_PCT: |
| 1238 | scounter = mp->m_sb.sb_imax_pct; |
| 1239 | scounter += delta; |
| 1240 | if (scounter < 0) { |
| 1241 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1242 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
| 1244 | mp->m_sb.sb_imax_pct = scounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1245 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | case XFS_SBS_REXTSIZE: |
| 1247 | scounter = mp->m_sb.sb_rextsize; |
| 1248 | scounter += delta; |
| 1249 | if (scounter < 0) { |
| 1250 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1251 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | } |
| 1253 | mp->m_sb.sb_rextsize = scounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1254 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | case XFS_SBS_RBMBLOCKS: |
| 1256 | scounter = mp->m_sb.sb_rbmblocks; |
| 1257 | scounter += delta; |
| 1258 | if (scounter < 0) { |
| 1259 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1260 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | } |
| 1262 | mp->m_sb.sb_rbmblocks = scounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1263 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | case XFS_SBS_RBLOCKS: |
| 1265 | lcounter = (long long)mp->m_sb.sb_rblocks; |
| 1266 | lcounter += delta; |
| 1267 | if (lcounter < 0) { |
| 1268 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1269 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | } |
| 1271 | mp->m_sb.sb_rblocks = lcounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1272 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | case XFS_SBS_REXTENTS: |
| 1274 | lcounter = (long long)mp->m_sb.sb_rextents; |
| 1275 | lcounter += delta; |
| 1276 | if (lcounter < 0) { |
| 1277 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1278 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | } |
| 1280 | mp->m_sb.sb_rextents = lcounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1281 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | case XFS_SBS_REXTSLOG: |
| 1283 | scounter = mp->m_sb.sb_rextslog; |
| 1284 | scounter += delta; |
| 1285 | if (scounter < 0) { |
| 1286 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1287 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | } |
| 1289 | mp->m_sb.sb_rextslog = scounter; |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1290 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | default: |
| 1292 | ASSERT(0); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1293 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | /* |
| 1298 | * xfs_mod_incore_sb() is used to change a field in the in-core |
| 1299 | * superblock structure by the specified delta. This modification |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1300 | * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | * routine to do the work. |
| 1302 | */ |
| 1303 | int |
David Chinner | 20f4ebf | 2007-02-10 18:36:10 +1100 | [diff] [blame] | 1304 | xfs_mod_incore_sb( |
Christoph Hellwig | 96540c7 | 2010-09-30 02:25:55 +0000 | [diff] [blame] | 1305 | struct xfs_mount *mp, |
| 1306 | xfs_sb_field_t field, |
| 1307 | int64_t delta, |
| 1308 | int rsvd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | { |
Christoph Hellwig | 96540c7 | 2010-09-30 02:25:55 +0000 | [diff] [blame] | 1310 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1312 | #ifdef HAVE_PERCPU_SB |
Christoph Hellwig | 96540c7 | 2010-09-30 02:25:55 +0000 | [diff] [blame] | 1313 | ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1314 | #endif |
Christoph Hellwig | 96540c7 | 2010-09-30 02:25:55 +0000 | [diff] [blame] | 1315 | spin_lock(&mp->m_sb_lock); |
| 1316 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
| 1317 | spin_unlock(&mp->m_sb_lock); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1318 | |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1319 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | /* |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1323 | * Change more than one field in the in-core superblock structure at a time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | * |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1325 | * The fields and changes to those fields are specified in the array of |
| 1326 | * xfs_mod_sb structures passed in. Either all of the specified deltas |
| 1327 | * will be applied or none of them will. If any modified field dips below 0, |
| 1328 | * then all modifications will be backed out and EINVAL will be returned. |
| 1329 | * |
| 1330 | * Note that this function may not be used for the superblock values that |
| 1331 | * are tracked with the in-memory per-cpu counters - a direct call to |
| 1332 | * xfs_icsb_modify_counters is required for these. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | */ |
| 1334 | int |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1335 | xfs_mod_incore_sb_batch( |
| 1336 | struct xfs_mount *mp, |
| 1337 | xfs_mod_sb_t *msb, |
| 1338 | uint nmsb, |
| 1339 | int rsvd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | { |
David Sterba | 45c51b9 | 2011-04-13 22:03:28 +0000 | [diff] [blame] | 1341 | xfs_mod_sb_t *msbp; |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1342 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
| 1344 | /* |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1345 | * Loop through the array of mod structures and apply each individually. |
| 1346 | * If any fail, then back out all those which have already been applied. |
| 1347 | * Do all of this within the scope of the m_sb_lock so that all of the |
| 1348 | * changes will be atomic. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | */ |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1350 | spin_lock(&mp->m_sb_lock); |
David Sterba | 45c51b9 | 2011-04-13 22:03:28 +0000 | [diff] [blame] | 1351 | for (msbp = msb; msbp < (msb + nmsb); msbp++) { |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1352 | ASSERT(msbp->msb_field < XFS_SBS_ICOUNT || |
| 1353 | msbp->msb_field > XFS_SBS_FDBLOCKS); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1354 | |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1355 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, |
| 1356 | msbp->msb_delta, rsvd); |
| 1357 | if (error) |
| 1358 | goto unwind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | } |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1360 | spin_unlock(&mp->m_sb_lock); |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1361 | return 0; |
| 1362 | |
| 1363 | unwind: |
| 1364 | while (--msbp >= msb) { |
| 1365 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, |
| 1366 | -msbp->msb_delta, rsvd); |
| 1367 | ASSERT(error == 0); |
| 1368 | } |
| 1369 | spin_unlock(&mp->m_sb_lock); |
| 1370 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | } |
| 1372 | |
| 1373 | /* |
| 1374 | * xfs_getsb() is called to obtain the buffer for the superblock. |
| 1375 | * The buffer is returned locked and read in from disk. |
| 1376 | * The buffer should be released with a call to xfs_brelse(). |
| 1377 | * |
| 1378 | * If the flags parameter is BUF_TRYLOCK, then we'll only return |
| 1379 | * the superblock buffer if it can be locked without sleeping. |
| 1380 | * If it can't then we'll return NULL. |
| 1381 | */ |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 1382 | struct xfs_buf * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | xfs_getsb( |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 1384 | struct xfs_mount *mp, |
| 1385 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | { |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 1387 | struct xfs_buf *bp = mp->m_sb_bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 1389 | if (!xfs_buf_trylock(bp)) { |
| 1390 | if (flags & XBF_TRYLOCK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | return NULL; |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 1392 | xfs_buf_lock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | } |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 1394 | |
Chandra Seetharaman | 72790aa | 2011-07-22 23:40:04 +0000 | [diff] [blame] | 1395 | xfs_buf_hold(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | ASSERT(XFS_BUF_ISDONE(bp)); |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 1397 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | } |
| 1399 | |
| 1400 | /* |
| 1401 | * Used to free the superblock along various error paths. |
| 1402 | */ |
| 1403 | void |
| 1404 | xfs_freesb( |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1405 | struct xfs_mount *mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | { |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1407 | struct xfs_buf *bp = mp->m_sb_bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1409 | xfs_buf_lock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | mp->m_sb_bp = NULL; |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1411 | xfs_buf_relse(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | } |
| 1413 | |
| 1414 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | * Used to log changes to the superblock unit and width fields which could |
Eric Sandeen | e6957ea | 2008-04-10 12:19:34 +1000 | [diff] [blame] | 1416 | * be altered by the mount options, as well as any potential sb_features2 |
| 1417 | * fixup. Only the first superblock is updated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | */ |
Christoph Hellwig | 7884bc8 | 2009-01-19 02:04:07 +0100 | [diff] [blame] | 1419 | int |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 1420 | xfs_mount_log_sb( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | xfs_mount_t *mp, |
| 1422 | __int64_t fields) |
| 1423 | { |
| 1424 | xfs_trans_t *tp; |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1425 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | |
David Chinner | ee1c090 | 2008-03-06 13:45:50 +1100 | [diff] [blame] | 1427 | ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID | |
David Chinner | 4b166de | 2008-05-20 11:30:27 +1000 | [diff] [blame] | 1428 | XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 | |
| 1429 | XFS_SB_VERSIONNUM)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | |
| 1431 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); |
Jie Liu | 3d3c8b5 | 2013-08-12 20:49:59 +1000 | [diff] [blame] | 1432 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1433 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | xfs_trans_cancel(tp, 0); |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1435 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | } |
| 1437 | xfs_mod_sb(tp, fields); |
David Chinner | e5720ee | 2008-04-10 12:21:18 +1000 | [diff] [blame] | 1438 | error = xfs_trans_commit(tp, 0); |
| 1439 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | } |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1441 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 1442 | /* |
| 1443 | * If the underlying (data/log/rt) device is readonly, there are some |
| 1444 | * operations that cannot proceed. |
| 1445 | */ |
| 1446 | int |
| 1447 | xfs_dev_is_read_only( |
| 1448 | struct xfs_mount *mp, |
| 1449 | char *message) |
| 1450 | { |
| 1451 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || |
| 1452 | xfs_readonly_buftarg(mp->m_logdev_targp) || |
| 1453 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 1454 | xfs_notice(mp, "%s required on read-only device.", message); |
| 1455 | xfs_notice(mp, "write access unavailable, cannot proceed."); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1456 | return -EROFS; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 1457 | } |
| 1458 | return 0; |
| 1459 | } |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1460 | |
| 1461 | #ifdef HAVE_PERCPU_SB |
| 1462 | /* |
| 1463 | * Per-cpu incore superblock counters |
| 1464 | * |
| 1465 | * Simple concept, difficult implementation |
| 1466 | * |
| 1467 | * Basically, replace the incore superblock counters with a distributed per cpu |
| 1468 | * counter for contended fields (e.g. free block count). |
| 1469 | * |
| 1470 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and |
| 1471 | * hence needs to be accurately read when we are running low on space. Hence |
| 1472 | * there is a method to enable and disable the per-cpu counters based on how |
| 1473 | * much "stuff" is available in them. |
| 1474 | * |
| 1475 | * Basically, a counter is enabled if there is enough free resource to justify |
| 1476 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local |
| 1477 | * ENOSPC), then we disable the counters to synchronise all callers and |
| 1478 | * re-distribute the available resources. |
| 1479 | * |
| 1480 | * If, once we redistributed the available resources, we still get a failure, |
| 1481 | * we disable the per-cpu counter and go through the slow path. |
| 1482 | * |
| 1483 | * The slow path is the current xfs_mod_incore_sb() function. This means that |
Malcolm Parsons | 9da096f | 2009-03-29 09:55:42 +0200 | [diff] [blame] | 1484 | * when we disable a per-cpu counter, we need to drain its resources back to |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1485 | * the global superblock. We do this after disabling the counter to prevent |
| 1486 | * more threads from queueing up on the counter. |
| 1487 | * |
| 1488 | * Essentially, this means that we still need a lock in the fast path to enable |
| 1489 | * synchronisation between the global counters and the per-cpu counters. This |
| 1490 | * is not a problem because the lock will be local to a CPU almost all the time |
| 1491 | * and have little contention except when we get to ENOSPC conditions. |
| 1492 | * |
| 1493 | * Basically, this lock becomes a barrier that enables us to lock out the fast |
| 1494 | * path while we do things like enabling and disabling counters and |
| 1495 | * synchronising the counters. |
| 1496 | * |
| 1497 | * Locking rules: |
| 1498 | * |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1499 | * 1. m_sb_lock before picking up per-cpu locks |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1500 | * 2. per-cpu locks always picked up via for_each_online_cpu() order |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1501 | * 3. accurate counter sync requires m_sb_lock + per cpu locks |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1502 | * 4. modifying per-cpu counters requires holding per-cpu lock |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1503 | * 5. modifying global counters requires holding m_sb_lock |
| 1504 | * 6. enabling or disabling a counter requires holding the m_sb_lock |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1505 | * and _none_ of the per-cpu locks. |
| 1506 | * |
| 1507 | * Disabled counters are only ever re-enabled by a balance operation |
| 1508 | * that results in more free resources per CPU than a given threshold. |
| 1509 | * To ensure counters don't remain disabled, they are rebalanced when |
| 1510 | * the global resource goes above a higher threshold (i.e. some hysteresis |
| 1511 | * is present to prevent thrashing). |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1512 | */ |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1513 | |
Chandra Seetharaman | 5a67e4c | 2006-06-27 02:54:11 -0700 | [diff] [blame] | 1514 | #ifdef CONFIG_HOTPLUG_CPU |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1515 | /* |
| 1516 | * hot-plug CPU notifier support. |
| 1517 | * |
Chandra Seetharaman | 5a67e4c | 2006-06-27 02:54:11 -0700 | [diff] [blame] | 1518 | * We need a notifier per filesystem as we need to be able to identify |
| 1519 | * the filesystem to balance the counters out. This is achieved by |
| 1520 | * having a notifier block embedded in the xfs_mount_t and doing pointer |
| 1521 | * magic to get the mount pointer from the notifier block address. |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1522 | */ |
| 1523 | STATIC int |
| 1524 | xfs_icsb_cpu_notify( |
| 1525 | struct notifier_block *nfb, |
| 1526 | unsigned long action, |
| 1527 | void *hcpu) |
| 1528 | { |
| 1529 | xfs_icsb_cnts_t *cntp; |
| 1530 | xfs_mount_t *mp; |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1531 | |
| 1532 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); |
| 1533 | cntp = (xfs_icsb_cnts_t *) |
| 1534 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); |
| 1535 | switch (action) { |
| 1536 | case CPU_UP_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1537 | case CPU_UP_PREPARE_FROZEN: |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1538 | /* Easy Case - initialize the area and locks, and |
| 1539 | * then rebalance when online does everything else for us. */ |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1540 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1541 | break; |
| 1542 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1543 | case CPU_ONLINE_FROZEN: |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1544 | xfs_icsb_lock(mp); |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1545 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
| 1546 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); |
| 1547 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1548 | xfs_icsb_unlock(mp); |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1549 | break; |
| 1550 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1551 | case CPU_DEAD_FROZEN: |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1552 | /* Disable all the counters, then fold the dead cpu's |
| 1553 | * count into the total on the global superblock and |
| 1554 | * re-enable the counters. */ |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1555 | xfs_icsb_lock(mp); |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1556 | spin_lock(&mp->m_sb_lock); |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1557 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); |
| 1558 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); |
| 1559 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); |
| 1560 | |
| 1561 | mp->m_sb.sb_icount += cntp->icsb_icount; |
| 1562 | mp->m_sb.sb_ifree += cntp->icsb_ifree; |
| 1563 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; |
| 1564 | |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1565 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1566 | |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1567 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0); |
| 1568 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0); |
| 1569 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0); |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1570 | spin_unlock(&mp->m_sb_lock); |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1571 | xfs_icsb_unlock(mp); |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1572 | break; |
| 1573 | } |
| 1574 | |
| 1575 | return NOTIFY_OK; |
| 1576 | } |
Chandra Seetharaman | 5a67e4c | 2006-06-27 02:54:11 -0700 | [diff] [blame] | 1577 | #endif /* CONFIG_HOTPLUG_CPU */ |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1578 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1579 | int |
| 1580 | xfs_icsb_init_counters( |
| 1581 | xfs_mount_t *mp) |
| 1582 | { |
| 1583 | xfs_icsb_cnts_t *cntp; |
| 1584 | int i; |
| 1585 | |
| 1586 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); |
| 1587 | if (mp->m_sb_cnts == NULL) |
| 1588 | return -ENOMEM; |
| 1589 | |
| 1590 | for_each_online_cpu(i) { |
| 1591 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1592 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1593 | } |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1594 | |
| 1595 | mutex_init(&mp->m_icsb_mutex); |
| 1596 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1597 | /* |
| 1598 | * start with all counters disabled so that the |
| 1599 | * initial balance kicks us off correctly |
| 1600 | */ |
| 1601 | mp->m_icsb_counters = -1; |
Richard Weinberger | 46677e6 | 2013-08-19 22:56:44 +0200 | [diff] [blame] | 1602 | |
| 1603 | #ifdef CONFIG_HOTPLUG_CPU |
| 1604 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
| 1605 | mp->m_icsb_notifier.priority = 0; |
| 1606 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
| 1607 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 1608 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1609 | return 0; |
| 1610 | } |
| 1611 | |
Lachlan McIlroy | 5478eea | 2007-02-10 18:36:29 +1100 | [diff] [blame] | 1612 | void |
| 1613 | xfs_icsb_reinit_counters( |
| 1614 | xfs_mount_t *mp) |
| 1615 | { |
| 1616 | xfs_icsb_lock(mp); |
| 1617 | /* |
| 1618 | * start with all counters disabled so that the |
| 1619 | * initial balance kicks us off correctly |
| 1620 | */ |
| 1621 | mp->m_icsb_counters = -1; |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1622 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
| 1623 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); |
| 1624 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); |
Lachlan McIlroy | 5478eea | 2007-02-10 18:36:29 +1100 | [diff] [blame] | 1625 | xfs_icsb_unlock(mp); |
| 1626 | } |
| 1627 | |
Christoph Hellwig | c962fb7 | 2008-05-20 15:10:52 +1000 | [diff] [blame] | 1628 | void |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1629 | xfs_icsb_destroy_counters( |
| 1630 | xfs_mount_t *mp) |
| 1631 | { |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1632 | if (mp->m_sb_cnts) { |
Chandra Seetharaman | 5a67e4c | 2006-06-27 02:54:11 -0700 | [diff] [blame] | 1633 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1634 | free_percpu(mp->m_sb_cnts); |
David Chinner | e8234a6 | 2006-03-14 13:23:52 +1100 | [diff] [blame] | 1635 | } |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1636 | mutex_destroy(&mp->m_icsb_mutex); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1637 | } |
| 1638 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1639 | STATIC void |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1640 | xfs_icsb_lock_cntr( |
| 1641 | xfs_icsb_cnts_t *icsbp) |
| 1642 | { |
| 1643 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { |
| 1644 | ndelay(1000); |
| 1645 | } |
| 1646 | } |
| 1647 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1648 | STATIC void |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1649 | xfs_icsb_unlock_cntr( |
| 1650 | xfs_icsb_cnts_t *icsbp) |
| 1651 | { |
| 1652 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); |
| 1653 | } |
| 1654 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1655 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1656 | STATIC void |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1657 | xfs_icsb_lock_all_counters( |
| 1658 | xfs_mount_t *mp) |
| 1659 | { |
| 1660 | xfs_icsb_cnts_t *cntp; |
| 1661 | int i; |
| 1662 | |
| 1663 | for_each_online_cpu(i) { |
| 1664 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1665 | xfs_icsb_lock_cntr(cntp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1666 | } |
| 1667 | } |
| 1668 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1669 | STATIC void |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1670 | xfs_icsb_unlock_all_counters( |
| 1671 | xfs_mount_t *mp) |
| 1672 | { |
| 1673 | xfs_icsb_cnts_t *cntp; |
| 1674 | int i; |
| 1675 | |
| 1676 | for_each_online_cpu(i) { |
| 1677 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1678 | xfs_icsb_unlock_cntr(cntp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1679 | } |
| 1680 | } |
| 1681 | |
| 1682 | STATIC void |
| 1683 | xfs_icsb_count( |
| 1684 | xfs_mount_t *mp, |
| 1685 | xfs_icsb_cnts_t *cnt, |
| 1686 | int flags) |
| 1687 | { |
| 1688 | xfs_icsb_cnts_t *cntp; |
| 1689 | int i; |
| 1690 | |
| 1691 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); |
| 1692 | |
| 1693 | if (!(flags & XFS_ICSB_LAZY_COUNT)) |
| 1694 | xfs_icsb_lock_all_counters(mp); |
| 1695 | |
| 1696 | for_each_online_cpu(i) { |
| 1697 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); |
| 1698 | cnt->icsb_icount += cntp->icsb_icount; |
| 1699 | cnt->icsb_ifree += cntp->icsb_ifree; |
| 1700 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; |
| 1701 | } |
| 1702 | |
| 1703 | if (!(flags & XFS_ICSB_LAZY_COUNT)) |
| 1704 | xfs_icsb_unlock_all_counters(mp); |
| 1705 | } |
| 1706 | |
| 1707 | STATIC int |
| 1708 | xfs_icsb_counter_disabled( |
| 1709 | xfs_mount_t *mp, |
| 1710 | xfs_sb_field_t field) |
| 1711 | { |
| 1712 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); |
| 1713 | return test_bit(field, &mp->m_icsb_counters); |
| 1714 | } |
| 1715 | |
David Chinner | 36fbe6e | 2008-04-10 12:19:56 +1000 | [diff] [blame] | 1716 | STATIC void |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1717 | xfs_icsb_disable_counter( |
| 1718 | xfs_mount_t *mp, |
| 1719 | xfs_sb_field_t field) |
| 1720 | { |
| 1721 | xfs_icsb_cnts_t cnt; |
| 1722 | |
| 1723 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); |
| 1724 | |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1725 | /* |
| 1726 | * If we are already disabled, then there is nothing to do |
| 1727 | * here. We check before locking all the counters to avoid |
| 1728 | * the expensive lock operation when being called in the |
| 1729 | * slow path and the counter is already disabled. This is |
| 1730 | * safe because the only time we set or clear this state is under |
| 1731 | * the m_icsb_mutex. |
| 1732 | */ |
| 1733 | if (xfs_icsb_counter_disabled(mp, field)) |
David Chinner | 36fbe6e | 2008-04-10 12:19:56 +1000 | [diff] [blame] | 1734 | return; |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1735 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1736 | xfs_icsb_lock_all_counters(mp); |
| 1737 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { |
| 1738 | /* drain back to superblock */ |
| 1739 | |
Christoph Hellwig | ce46193 | 2008-04-22 17:34:50 +1000 | [diff] [blame] | 1740 | xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1741 | switch(field) { |
| 1742 | case XFS_SBS_ICOUNT: |
| 1743 | mp->m_sb.sb_icount = cnt.icsb_icount; |
| 1744 | break; |
| 1745 | case XFS_SBS_IFREE: |
| 1746 | mp->m_sb.sb_ifree = cnt.icsb_ifree; |
| 1747 | break; |
| 1748 | case XFS_SBS_FDBLOCKS: |
| 1749 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; |
| 1750 | break; |
| 1751 | default: |
| 1752 | BUG(); |
| 1753 | } |
| 1754 | } |
| 1755 | |
| 1756 | xfs_icsb_unlock_all_counters(mp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1757 | } |
| 1758 | |
| 1759 | STATIC void |
| 1760 | xfs_icsb_enable_counter( |
| 1761 | xfs_mount_t *mp, |
| 1762 | xfs_sb_field_t field, |
| 1763 | uint64_t count, |
| 1764 | uint64_t resid) |
| 1765 | { |
| 1766 | xfs_icsb_cnts_t *cntp; |
| 1767 | int i; |
| 1768 | |
| 1769 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); |
| 1770 | |
| 1771 | xfs_icsb_lock_all_counters(mp); |
| 1772 | for_each_online_cpu(i) { |
| 1773 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); |
| 1774 | switch (field) { |
| 1775 | case XFS_SBS_ICOUNT: |
| 1776 | cntp->icsb_icount = count + resid; |
| 1777 | break; |
| 1778 | case XFS_SBS_IFREE: |
| 1779 | cntp->icsb_ifree = count + resid; |
| 1780 | break; |
| 1781 | case XFS_SBS_FDBLOCKS: |
| 1782 | cntp->icsb_fdblocks = count + resid; |
| 1783 | break; |
| 1784 | default: |
| 1785 | BUG(); |
| 1786 | break; |
| 1787 | } |
| 1788 | resid = 0; |
| 1789 | } |
| 1790 | clear_bit(field, &mp->m_icsb_counters); |
| 1791 | xfs_icsb_unlock_all_counters(mp); |
| 1792 | } |
| 1793 | |
David Chinner | dbcabad | 2007-02-10 18:36:17 +1100 | [diff] [blame] | 1794 | void |
Christoph Hellwig | d4d90b5 | 2008-04-22 17:34:37 +1000 | [diff] [blame] | 1795 | xfs_icsb_sync_counters_locked( |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1796 | xfs_mount_t *mp, |
| 1797 | int flags) |
| 1798 | { |
| 1799 | xfs_icsb_cnts_t cnt; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1800 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1801 | xfs_icsb_count(mp, &cnt, flags); |
| 1802 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1803 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) |
| 1804 | mp->m_sb.sb_icount = cnt.icsb_icount; |
| 1805 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) |
| 1806 | mp->m_sb.sb_ifree = cnt.icsb_ifree; |
| 1807 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) |
| 1808 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1809 | } |
| 1810 | |
| 1811 | /* |
| 1812 | * Accurate update of per-cpu counters to incore superblock |
| 1813 | */ |
Christoph Hellwig | d4d90b5 | 2008-04-22 17:34:37 +1000 | [diff] [blame] | 1814 | void |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1815 | xfs_icsb_sync_counters( |
Christoph Hellwig | d4d90b5 | 2008-04-22 17:34:37 +1000 | [diff] [blame] | 1816 | xfs_mount_t *mp, |
| 1817 | int flags) |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1818 | { |
Christoph Hellwig | d4d90b5 | 2008-04-22 17:34:37 +1000 | [diff] [blame] | 1819 | spin_lock(&mp->m_sb_lock); |
| 1820 | xfs_icsb_sync_counters_locked(mp, flags); |
| 1821 | spin_unlock(&mp->m_sb_lock); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1822 | } |
| 1823 | |
| 1824 | /* |
| 1825 | * Balance and enable/disable counters as necessary. |
| 1826 | * |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1827 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
| 1828 | * chosen to be the same number as single on disk allocation chunk per CPU, and |
| 1829 | * free blocks is something far enough zero that we aren't going thrash when we |
| 1830 | * get near ENOSPC. We also need to supply a minimum we require per cpu to |
| 1831 | * prevent looping endlessly when xfs_alloc_space asks for more than will |
| 1832 | * be distributed to a single CPU but each CPU has enough blocks to be |
| 1833 | * reenabled. |
| 1834 | * |
| 1835 | * Note that we can be called when counters are already disabled. |
| 1836 | * xfs_icsb_disable_counter() optimises the counter locking in this case to |
| 1837 | * prevent locking every per-cpu counter needlessly. |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1838 | */ |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1839 | |
| 1840 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 |
David Chinner | 4be536d | 2006-09-07 14:26:50 +1000 | [diff] [blame] | 1841 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1842 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1843 | STATIC void |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1844 | xfs_icsb_balance_counter_locked( |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1845 | xfs_mount_t *mp, |
| 1846 | xfs_sb_field_t field, |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1847 | int min_per_cpu) |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1848 | { |
Nathan Scott | 6fdf8cc | 2006-06-28 10:13:52 +1000 | [diff] [blame] | 1849 | uint64_t count, resid; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1850 | int weight = num_online_cpus(); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1851 | uint64_t min = (uint64_t)min_per_cpu; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1852 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1853 | /* disable counter and sync counter */ |
| 1854 | xfs_icsb_disable_counter(mp, field); |
| 1855 | |
| 1856 | /* update counters - first CPU gets residual*/ |
| 1857 | switch (field) { |
| 1858 | case XFS_SBS_ICOUNT: |
| 1859 | count = mp->m_sb.sb_icount; |
| 1860 | resid = do_div(count, weight); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1861 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1862 | return; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1863 | break; |
| 1864 | case XFS_SBS_IFREE: |
| 1865 | count = mp->m_sb.sb_ifree; |
| 1866 | resid = do_div(count, weight); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1867 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1868 | return; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1869 | break; |
| 1870 | case XFS_SBS_FDBLOCKS: |
| 1871 | count = mp->m_sb.sb_fdblocks; |
| 1872 | resid = do_div(count, weight); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1873 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1874 | return; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1875 | break; |
| 1876 | default: |
| 1877 | BUG(); |
Nathan Scott | 6fdf8cc | 2006-06-28 10:13:52 +1000 | [diff] [blame] | 1878 | count = resid = 0; /* quiet, gcc */ |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1879 | break; |
| 1880 | } |
| 1881 | |
| 1882 | xfs_icsb_enable_counter(mp, field, count, resid); |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 1883 | } |
| 1884 | |
| 1885 | STATIC void |
| 1886 | xfs_icsb_balance_counter( |
| 1887 | xfs_mount_t *mp, |
| 1888 | xfs_sb_field_t fields, |
| 1889 | int min_per_cpu) |
| 1890 | { |
| 1891 | spin_lock(&mp->m_sb_lock); |
| 1892 | xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu); |
| 1893 | spin_unlock(&mp->m_sb_lock); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1894 | } |
| 1895 | |
Christoph Hellwig | 1b04071 | 2010-09-30 02:25:56 +0000 | [diff] [blame] | 1896 | int |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1897 | xfs_icsb_modify_counters( |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1898 | xfs_mount_t *mp, |
| 1899 | xfs_sb_field_t field, |
David Chinner | 20f4ebf | 2007-02-10 18:36:10 +1100 | [diff] [blame] | 1900 | int64_t delta, |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1901 | int rsvd) |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1902 | { |
| 1903 | xfs_icsb_cnts_t *icsbp; |
| 1904 | long long lcounter; /* long counter for 64 bit fields */ |
Christoph Lameter | 7a9e02d | 2009-10-03 19:48:23 +0900 | [diff] [blame] | 1905 | int ret = 0; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1906 | |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1907 | might_sleep(); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1908 | again: |
Christoph Lameter | 7a9e02d | 2009-10-03 19:48:23 +0900 | [diff] [blame] | 1909 | preempt_disable(); |
| 1910 | icsbp = this_cpu_ptr(mp->m_sb_cnts); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1911 | |
| 1912 | /* |
| 1913 | * if the counter is disabled, go to slow path |
| 1914 | */ |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1915 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
| 1916 | goto slow_path; |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1917 | xfs_icsb_lock_cntr(icsbp); |
| 1918 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { |
| 1919 | xfs_icsb_unlock_cntr(icsbp); |
| 1920 | goto slow_path; |
| 1921 | } |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1922 | |
| 1923 | switch (field) { |
| 1924 | case XFS_SBS_ICOUNT: |
| 1925 | lcounter = icsbp->icsb_icount; |
| 1926 | lcounter += delta; |
| 1927 | if (unlikely(lcounter < 0)) |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1928 | goto balance_counter; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1929 | icsbp->icsb_icount = lcounter; |
| 1930 | break; |
| 1931 | |
| 1932 | case XFS_SBS_IFREE: |
| 1933 | lcounter = icsbp->icsb_ifree; |
| 1934 | lcounter += delta; |
| 1935 | if (unlikely(lcounter < 0)) |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1936 | goto balance_counter; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1937 | icsbp->icsb_ifree = lcounter; |
| 1938 | break; |
| 1939 | |
| 1940 | case XFS_SBS_FDBLOCKS: |
| 1941 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); |
| 1942 | |
David Chinner | 4be536d | 2006-09-07 14:26:50 +1000 | [diff] [blame] | 1943 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1944 | lcounter += delta; |
| 1945 | if (unlikely(lcounter < 0)) |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1946 | goto balance_counter; |
David Chinner | 4be536d | 2006-09-07 14:26:50 +1000 | [diff] [blame] | 1947 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1948 | break; |
| 1949 | default: |
| 1950 | BUG(); |
| 1951 | break; |
| 1952 | } |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 1953 | xfs_icsb_unlock_cntr(icsbp); |
Christoph Lameter | 7a9e02d | 2009-10-03 19:48:23 +0900 | [diff] [blame] | 1954 | preempt_enable(); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1955 | return 0; |
| 1956 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 1957 | slow_path: |
Christoph Lameter | 7a9e02d | 2009-10-03 19:48:23 +0900 | [diff] [blame] | 1958 | preempt_enable(); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1959 | |
| 1960 | /* |
| 1961 | * serialise with a mutex so we don't burn lots of cpu on |
| 1962 | * the superblock lock. We still need to hold the superblock |
| 1963 | * lock, however, when we modify the global structures. |
| 1964 | */ |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1965 | xfs_icsb_lock(mp); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1966 | |
| 1967 | /* |
| 1968 | * Now running atomically. |
| 1969 | * |
| 1970 | * If the counter is enabled, someone has beaten us to rebalancing. |
| 1971 | * Drop the lock and try again in the fast path.... |
| 1972 | */ |
| 1973 | if (!(xfs_icsb_counter_disabled(mp, field))) { |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 1974 | xfs_icsb_unlock(mp); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1975 | goto again; |
| 1976 | } |
| 1977 | |
| 1978 | /* |
| 1979 | * The counter is currently disabled. Because we are |
| 1980 | * running atomically here, we know a rebalance cannot |
| 1981 | * be in progress. Hence we can go straight to operating |
| 1982 | * on the global superblock. We do not call xfs_mod_incore_sb() |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1983 | * here even though we need to get the m_sb_lock. Doing so |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1984 | * will cause us to re-enter this function and deadlock. |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1985 | * Hence we get the m_sb_lock ourselves and then call |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1986 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates |
| 1987 | * directly on the global counters. |
| 1988 | */ |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1989 | spin_lock(&mp->m_sb_lock); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1990 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
Eric Sandeen | 3685c2a | 2007-10-11 17:42:32 +1000 | [diff] [blame] | 1991 | spin_unlock(&mp->m_sb_lock); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 1992 | |
| 1993 | /* |
| 1994 | * Now that we've modified the global superblock, we |
| 1995 | * may be able to re-enable the distributed counters |
| 1996 | * (e.g. lots of space just got freed). After that |
| 1997 | * we are done. |
| 1998 | */ |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1999 | if (ret != -ENOSPC) |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 2000 | xfs_icsb_balance_counter(mp, field, 0); |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 2001 | xfs_icsb_unlock(mp); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 2002 | return ret; |
| 2003 | |
| 2004 | balance_counter: |
David Chinner | 01e1b69 | 2006-03-14 13:29:16 +1100 | [diff] [blame] | 2005 | xfs_icsb_unlock_cntr(icsbp); |
Christoph Lameter | 7a9e02d | 2009-10-03 19:48:23 +0900 | [diff] [blame] | 2006 | preempt_enable(); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 2007 | |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 2008 | /* |
| 2009 | * We may have multiple threads here if multiple per-cpu |
| 2010 | * counters run dry at the same time. This will mean we can |
| 2011 | * do more balances than strictly necessary but it is not |
| 2012 | * the common slowpath case. |
| 2013 | */ |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 2014 | xfs_icsb_lock(mp); |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 2015 | |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 2016 | /* |
| 2017 | * running atomically. |
| 2018 | * |
| 2019 | * This will leave the counter in the correct state for future |
| 2020 | * accesses. After the rebalance, we simply try again and our retry |
| 2021 | * will either succeed through the fast path or slow path without |
| 2022 | * another balance operation being required. |
| 2023 | */ |
Christoph Hellwig | 45af6c6 | 2008-04-22 17:34:44 +1000 | [diff] [blame] | 2024 | xfs_icsb_balance_counter(mp, field, delta); |
David Chinner | 03135cf | 2007-02-10 18:35:15 +1100 | [diff] [blame] | 2025 | xfs_icsb_unlock(mp); |
David Chinner | 20b6428 | 2007-02-10 18:35:09 +1100 | [diff] [blame] | 2026 | goto again; |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 2027 | } |
| 2028 | |
David Chinner | 8d280b9 | 2006-03-14 13:13:09 +1100 | [diff] [blame] | 2029 | #endif |