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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "xfs_types.h" |
Christoph Hellwig | ef14f0c | 2009-06-10 17:07:47 +0200 | [diff] [blame] | 21 | #include "xfs_acl.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 22 | #include "xfs_bit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 24 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "xfs_trans.h" |
| 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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_bmap_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 30 | #include "xfs_alloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "xfs_ialloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_dinode.h" |
| 33 | #include "xfs_inode.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 34 | #include "xfs_btree.h" |
| 35 | #include "xfs_ialloc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include "xfs_quota.h" |
| 37 | #include "xfs_utils.h" |
David Chinner | 783a2f6 | 2008-10-30 17:39:58 +1100 | [diff] [blame] | 38 | #include "xfs_trans_priv.h" |
| 39 | #include "xfs_inode_item.h" |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 40 | #include "xfs_bmap.h" |
| 41 | #include "xfs_btree_trace.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 42 | #include "xfs_trace.h" |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 43 | |
| 44 | |
| 45 | /* |
Dave Chinner | dcfcf20 | 2010-12-23 11:57:13 +1100 | [diff] [blame] | 46 | * Define xfs inode iolock lockdep classes. We need to ensure that all active |
| 47 | * inodes are considered the same for lockdep purposes, including inodes that |
| 48 | * are recycled through the XFS_IRECLAIMABLE state. This is the the only way to |
| 49 | * guarantee the locks are considered the same when there are multiple lock |
| 50 | * initialisation siteѕ. Also, define a reclaimable inode class so it is |
| 51 | * obvious in lockdep reports which class the report is against. |
| 52 | */ |
| 53 | static struct lock_class_key xfs_iolock_active; |
| 54 | struct lock_class_key xfs_iolock_reclaimable; |
| 55 | |
| 56 | /* |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 57 | * Allocate and initialise an xfs_inode. |
| 58 | */ |
| 59 | STATIC struct xfs_inode * |
| 60 | xfs_inode_alloc( |
| 61 | struct xfs_mount *mp, |
| 62 | xfs_ino_t ino) |
| 63 | { |
| 64 | struct xfs_inode *ip; |
| 65 | |
| 66 | /* |
| 67 | * if this didn't occur in transactions, we could use |
| 68 | * KM_MAYFAIL and return NULL here on ENOMEM. Set the |
| 69 | * code up to do this anyway. |
| 70 | */ |
| 71 | ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP); |
| 72 | if (!ip) |
| 73 | return NULL; |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 74 | if (inode_init_always(mp->m_super, VFS_I(ip))) { |
| 75 | kmem_zone_free(xfs_inode_zone, ip); |
| 76 | return NULL; |
| 77 | } |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 78 | |
| 79 | ASSERT(atomic_read(&ip->i_iocount) == 0); |
| 80 | ASSERT(atomic_read(&ip->i_pincount) == 0); |
| 81 | ASSERT(!spin_is_locked(&ip->i_flags_lock)); |
| 82 | ASSERT(completion_done(&ip->i_flush)); |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 83 | ASSERT(ip->i_ino == 0); |
Christoph Hellwig | 033da48 | 2009-10-19 04:05:26 +0000 | [diff] [blame] | 84 | |
| 85 | mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino); |
Dave Chinner | dcfcf20 | 2010-12-23 11:57:13 +1100 | [diff] [blame] | 86 | lockdep_set_class_and_name(&ip->i_iolock.mr_lock, |
| 87 | &xfs_iolock_active, "xfs_iolock_active"); |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 88 | |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 89 | /* initialise the xfs inode */ |
| 90 | ip->i_ino = ino; |
| 91 | ip->i_mount = mp; |
| 92 | memset(&ip->i_imap, 0, sizeof(struct xfs_imap)); |
| 93 | ip->i_afp = NULL; |
| 94 | memset(&ip->i_df, 0, sizeof(xfs_ifork_t)); |
| 95 | ip->i_flags = 0; |
| 96 | ip->i_update_core = 0; |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 97 | ip->i_delayed_blks = 0; |
| 98 | memset(&ip->i_d, 0, sizeof(xfs_icdinode_t)); |
| 99 | ip->i_size = 0; |
| 100 | ip->i_new_size = 0; |
| 101 | |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 102 | return ip; |
| 103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 105 | STATIC void |
| 106 | xfs_inode_free_callback( |
| 107 | struct rcu_head *head) |
| 108 | { |
| 109 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 110 | struct xfs_inode *ip = XFS_I(inode); |
| 111 | |
| 112 | INIT_LIST_HEAD(&inode->i_dentry); |
| 113 | kmem_zone_free(xfs_inode_zone, ip); |
| 114 | } |
| 115 | |
Dave Chinner | 2f11fea | 2010-07-20 17:53:25 +1000 | [diff] [blame] | 116 | void |
Christoph Hellwig | b36ec04 | 2009-08-07 14:38:34 -0300 | [diff] [blame] | 117 | xfs_inode_free( |
| 118 | struct xfs_inode *ip) |
| 119 | { |
| 120 | switch (ip->i_d.di_mode & S_IFMT) { |
| 121 | case S_IFREG: |
| 122 | case S_IFDIR: |
| 123 | case S_IFLNK: |
| 124 | xfs_idestroy_fork(ip, XFS_DATA_FORK); |
| 125 | break; |
| 126 | } |
| 127 | |
| 128 | if (ip->i_afp) |
| 129 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); |
| 130 | |
Christoph Hellwig | b36ec04 | 2009-08-07 14:38:34 -0300 | [diff] [blame] | 131 | if (ip->i_itemp) { |
| 132 | /* |
| 133 | * Only if we are shutting down the fs will we see an |
| 134 | * inode still in the AIL. If it is there, we should remove |
| 135 | * it to prevent a use-after-free from occurring. |
| 136 | */ |
| 137 | xfs_log_item_t *lip = &ip->i_itemp->ili_item; |
| 138 | struct xfs_ail *ailp = lip->li_ailp; |
| 139 | |
| 140 | ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) || |
| 141 | XFS_FORCED_SHUTDOWN(ip->i_mount)); |
| 142 | if (lip->li_flags & XFS_LI_IN_AIL) { |
| 143 | spin_lock(&ailp->xa_lock); |
| 144 | if (lip->li_flags & XFS_LI_IN_AIL) |
| 145 | xfs_trans_ail_delete(ailp, lip); |
| 146 | else |
| 147 | spin_unlock(&ailp->xa_lock); |
| 148 | } |
| 149 | xfs_inode_item_destroy(ip); |
| 150 | ip->i_itemp = NULL; |
| 151 | } |
| 152 | |
| 153 | /* asserts to verify all state is correct here */ |
| 154 | ASSERT(atomic_read(&ip->i_iocount) == 0); |
| 155 | ASSERT(atomic_read(&ip->i_pincount) == 0); |
| 156 | ASSERT(!spin_is_locked(&ip->i_flags_lock)); |
| 157 | ASSERT(completion_done(&ip->i_flush)); |
| 158 | |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 159 | /* |
| 160 | * Because we use RCU freeing we need to ensure the inode always |
| 161 | * appears to be reclaimed with an invalid inode number when in the |
| 162 | * free state. The ip->i_flags_lock provides the barrier against lookup |
| 163 | * races. |
| 164 | */ |
| 165 | spin_lock(&ip->i_flags_lock); |
| 166 | ip->i_flags = XFS_IRECLAIM; |
| 167 | ip->i_ino = 0; |
| 168 | spin_unlock(&ip->i_flags_lock); |
Alex Elder | 92f1c00 | 2011-01-10 21:35:55 -0600 | [diff] [blame] | 169 | |
| 170 | call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback); |
Christoph Hellwig | b36ec04 | 2009-08-07 14:38:34 -0300 | [diff] [blame] | 171 | } |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | /* |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 174 | * Check the validity of the inode we just found it the cache |
| 175 | */ |
| 176 | static int |
| 177 | xfs_iget_cache_hit( |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 178 | struct xfs_perag *pag, |
| 179 | struct xfs_inode *ip, |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 180 | xfs_ino_t ino, |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 181 | int flags, |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 182 | int lock_flags) __releases(RCU) |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 183 | { |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 184 | struct inode *inode = VFS_I(ip); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 185 | struct xfs_mount *mp = ip->i_mount; |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 186 | int error; |
| 187 | |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 188 | /* |
| 189 | * check for re-use of an inode within an RCU grace period due to the |
| 190 | * radix tree nodes not being updated yet. We monitor for this by |
| 191 | * setting the inode number to zero before freeing the inode structure. |
| 192 | * If the inode has been reallocated and set up, then the inode number |
| 193 | * will not match, so check for that, too. |
| 194 | */ |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 195 | spin_lock(&ip->i_flags_lock); |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 196 | if (ip->i_ino != ino) { |
| 197 | trace_xfs_iget_skip(ip); |
| 198 | XFS_STATS_INC(xs_ig_frecycle); |
| 199 | error = EAGAIN; |
| 200 | goto out_error; |
| 201 | } |
| 202 | |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 203 | |
| 204 | /* |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 205 | * If we are racing with another cache hit that is currently |
| 206 | * instantiating this inode or currently recycling it out of |
| 207 | * reclaimabe state, wait for the initialisation to complete |
| 208 | * before continuing. |
| 209 | * |
| 210 | * XXX(hch): eventually we should do something equivalent to |
| 211 | * wait_on_inode to wait for these flags to be cleared |
| 212 | * instead of polling for it. |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 213 | */ |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 214 | if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 215 | trace_xfs_iget_skip(ip); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 216 | XFS_STATS_INC(xs_ig_frecycle); |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 217 | error = EAGAIN; |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 218 | goto out_error; |
| 219 | } |
| 220 | |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 221 | /* |
| 222 | * If lookup is racing with unlink return an error immediately. |
| 223 | */ |
| 224 | if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) { |
| 225 | error = ENOENT; |
| 226 | goto out_error; |
| 227 | } |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 228 | |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 229 | /* |
| 230 | * If IRECLAIMABLE is set, we've torn down the VFS inode already. |
| 231 | * Need to carefully get it back into useable state. |
| 232 | */ |
| 233 | if (ip->i_flags & XFS_IRECLAIMABLE) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 234 | trace_xfs_iget_reclaim(ip); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 235 | |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 236 | /* |
Christoph Hellwig | f1f724e | 2010-03-01 11:30:31 +0000 | [diff] [blame] | 237 | * We need to set XFS_IRECLAIM to prevent xfs_reclaim_inode |
| 238 | * from stomping over us while we recycle the inode. We can't |
| 239 | * clear the radix tree reclaimable tag yet as it requires |
| 240 | * pag_ici_lock to be held exclusive. |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 241 | */ |
Christoph Hellwig | f1f724e | 2010-03-01 11:30:31 +0000 | [diff] [blame] | 242 | ip->i_flags |= XFS_IRECLAIM; |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 243 | |
| 244 | spin_unlock(&ip->i_flags_lock); |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 245 | rcu_read_unlock(); |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 246 | |
| 247 | error = -inode_init_always(mp->m_super, inode); |
| 248 | if (error) { |
| 249 | /* |
| 250 | * Re-initializing the inode failed, and we are in deep |
| 251 | * trouble. Try to re-add it to the reclaim list. |
| 252 | */ |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 253 | rcu_read_lock(); |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 254 | spin_lock(&ip->i_flags_lock); |
| 255 | |
Dave Chinner | 778e24b | 2011-06-23 01:34:59 +0000 | [diff] [blame] | 256 | ip->i_flags &= ~(XFS_INEW | XFS_IRECLAIM); |
| 257 | ASSERT(ip->i_flags & XFS_IRECLAIMABLE); |
Christoph Hellwig | d2e078c | 2010-06-24 11:50:22 +1000 | [diff] [blame] | 258 | trace_xfs_iget_reclaim_fail(ip); |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 259 | goto out_error; |
| 260 | } |
Christoph Hellwig | f1f724e | 2010-03-01 11:30:31 +0000 | [diff] [blame] | 261 | |
Dave Chinner | 1a427ab | 2010-12-16 17:08:41 +1100 | [diff] [blame] | 262 | spin_lock(&pag->pag_ici_lock); |
Christoph Hellwig | f1f724e | 2010-03-01 11:30:31 +0000 | [diff] [blame] | 263 | spin_lock(&ip->i_flags_lock); |
Dave Chinner | 778e24b | 2011-06-23 01:34:59 +0000 | [diff] [blame] | 264 | |
| 265 | /* |
| 266 | * Clear the per-lifetime state in the inode as we are now |
| 267 | * effectively a new inode and need to return to the initial |
| 268 | * state before reuse occurs. |
| 269 | */ |
| 270 | ip->i_flags &= ~XFS_IRECLAIM_RESET_FLAGS; |
Christoph Hellwig | f1f724e | 2010-03-01 11:30:31 +0000 | [diff] [blame] | 271 | ip->i_flags |= XFS_INEW; |
| 272 | __xfs_inode_clear_reclaim_tag(mp, pag, ip); |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 273 | inode->i_state = I_NEW; |
Dave Chinner | dcfcf20 | 2010-12-23 11:57:13 +1100 | [diff] [blame] | 274 | |
| 275 | ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); |
| 276 | mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino); |
| 277 | lockdep_set_class_and_name(&ip->i_iolock.mr_lock, |
| 278 | &xfs_iolock_active, "xfs_iolock_active"); |
| 279 | |
Christoph Hellwig | f1f724e | 2010-03-01 11:30:31 +0000 | [diff] [blame] | 280 | spin_unlock(&ip->i_flags_lock); |
Dave Chinner | 1a427ab | 2010-12-16 17:08:41 +1100 | [diff] [blame] | 281 | spin_unlock(&pag->pag_ici_lock); |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 282 | } else { |
| 283 | /* If the VFS inode is being torn down, pause and try again. */ |
| 284 | if (!igrab(inode)) { |
Christoph Hellwig | d2e078c | 2010-06-24 11:50:22 +1000 | [diff] [blame] | 285 | trace_xfs_iget_skip(ip); |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 286 | error = EAGAIN; |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 287 | goto out_error; |
| 288 | } |
David Chinner | 6bfb3d0 | 2008-10-30 18:32:43 +1100 | [diff] [blame] | 289 | |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 290 | /* We've got a live one. */ |
| 291 | spin_unlock(&ip->i_flags_lock); |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 292 | rcu_read_unlock(); |
Christoph Hellwig | d2e078c | 2010-06-24 11:50:22 +1000 | [diff] [blame] | 293 | trace_xfs_iget_hit(ip); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 294 | } |
| 295 | |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 296 | if (lock_flags != 0) |
| 297 | xfs_ilock(ip, lock_flags); |
| 298 | |
| 299 | xfs_iflags_clear(ip, XFS_ISTALE); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 300 | XFS_STATS_INC(xs_ig_found); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 301 | |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 302 | return 0; |
| 303 | |
| 304 | out_error: |
Christoph Hellwig | bc990f5 | 2009-08-16 20:36:34 -0400 | [diff] [blame] | 305 | spin_unlock(&ip->i_flags_lock); |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 306 | rcu_read_unlock(); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 307 | return error; |
| 308 | } |
| 309 | |
| 310 | |
| 311 | static int |
| 312 | xfs_iget_cache_miss( |
| 313 | struct xfs_mount *mp, |
| 314 | struct xfs_perag *pag, |
| 315 | xfs_trans_t *tp, |
| 316 | xfs_ino_t ino, |
| 317 | struct xfs_inode **ipp, |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 318 | int flags, |
Christoph Hellwig | 0c3dc2b | 2009-11-14 16:17:23 +0000 | [diff] [blame] | 319 | int lock_flags) |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 320 | { |
| 321 | struct xfs_inode *ip; |
| 322 | int error; |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 323 | xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino); |
| 324 | |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 325 | ip = xfs_inode_alloc(mp, ino); |
| 326 | if (!ip) |
| 327 | return ENOMEM; |
| 328 | |
Dave Chinner | 7b6259e | 2010-06-24 11:35:17 +1000 | [diff] [blame] | 329 | error = xfs_iread(mp, tp, ip, flags); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 330 | if (error) |
Christoph Hellwig | 24f211b | 2008-11-28 14:23:42 +1100 | [diff] [blame] | 331 | goto out_destroy; |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 332 | |
Christoph Hellwig | d2e078c | 2010-06-24 11:50:22 +1000 | [diff] [blame] | 333 | trace_xfs_iget_miss(ip); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 334 | |
| 335 | if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) { |
| 336 | error = ENOENT; |
| 337 | goto out_destroy; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Preload the radix tree so we can insert safely under the |
David Chinner | 56e73ec | 2008-10-30 17:55:27 +1100 | [diff] [blame] | 342 | * write spinlock. Note that we cannot sleep inside the preload |
| 343 | * region. |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 344 | */ |
| 345 | if (radix_tree_preload(GFP_KERNEL)) { |
| 346 | error = EAGAIN; |
Christoph Hellwig | ed93ec3 | 2009-03-03 14:48:35 -0500 | [diff] [blame] | 347 | goto out_destroy; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Because the inode hasn't been added to the radix-tree yet it can't |
| 352 | * be found by another thread, so we can do the non-sleeping lock here. |
| 353 | */ |
| 354 | if (lock_flags) { |
| 355 | if (!xfs_ilock_nowait(ip, lock_flags)) |
| 356 | BUG(); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 357 | } |
| 358 | |
Dave Chinner | 1a427ab | 2010-12-16 17:08:41 +1100 | [diff] [blame] | 359 | spin_lock(&pag->pag_ici_lock); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 360 | |
| 361 | /* insert the new inode */ |
| 362 | error = radix_tree_insert(&pag->pag_ici_root, agino, ip); |
| 363 | if (unlikely(error)) { |
| 364 | WARN_ON(error != -EEXIST); |
| 365 | XFS_STATS_INC(xs_ig_dup); |
| 366 | error = EAGAIN; |
David Chinner | 56e73ec | 2008-10-30 17:55:27 +1100 | [diff] [blame] | 367 | goto out_preload_end; |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | /* These values _must_ be set before releasing the radix tree lock! */ |
| 371 | ip->i_udquot = ip->i_gdquot = NULL; |
| 372 | xfs_iflags_set(ip, XFS_INEW); |
| 373 | |
Dave Chinner | 1a427ab | 2010-12-16 17:08:41 +1100 | [diff] [blame] | 374 | spin_unlock(&pag->pag_ici_lock); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 375 | radix_tree_preload_end(); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 376 | |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 377 | *ipp = ip; |
| 378 | return 0; |
| 379 | |
David Chinner | 56e73ec | 2008-10-30 17:55:27 +1100 | [diff] [blame] | 380 | out_preload_end: |
Dave Chinner | 1a427ab | 2010-12-16 17:08:41 +1100 | [diff] [blame] | 381 | spin_unlock(&pag->pag_ici_lock); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 382 | radix_tree_preload_end(); |
David Chinner | 56e73ec | 2008-10-30 17:55:27 +1100 | [diff] [blame] | 383 | if (lock_flags) |
| 384 | xfs_iunlock(ip, lock_flags); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 385 | out_destroy: |
Christoph Hellwig | b36ec04 | 2009-08-07 14:38:34 -0300 | [diff] [blame] | 386 | __destroy_inode(VFS_I(ip)); |
| 387 | xfs_inode_free(ip); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 388 | return error; |
| 389 | } |
| 390 | |
| 391 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * Look up an inode by number in the given file system. |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 393 | * The inode is looked up in the cache held in each AG. |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 394 | * If the inode is found in the cache, initialise the vfs inode |
| 395 | * if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | * |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 397 | * If it is not in core, read it in from the file system's device, |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 398 | * add it to the cache and initialise the vfs inode. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | * |
| 400 | * The inode is locked according to the value of the lock_flags parameter. |
| 401 | * This flag parameter indicates how and if the inode's IO lock and inode lock |
| 402 | * should be taken. |
| 403 | * |
| 404 | * mp -- the mount point structure for the current file system. It points |
| 405 | * to the inode hash table. |
| 406 | * tp -- a pointer to the current transaction if there is one. This is |
| 407 | * simply passed through to the xfs_iread() call. |
| 408 | * ino -- the number of the inode desired. This is the unique identifier |
| 409 | * within the file system for the inode being requested. |
| 410 | * lock_flags -- flags indicating how to lock the inode. See the comment |
| 411 | * for xfs_ilock() for a list of valid values. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | */ |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 413 | int |
| 414 | xfs_iget( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | xfs_mount_t *mp, |
| 416 | xfs_trans_t *tp, |
| 417 | xfs_ino_t ino, |
| 418 | uint flags, |
| 419 | uint lock_flags, |
Dave Chinner | 7b6259e | 2010-06-24 11:35:17 +1000 | [diff] [blame] | 420 | xfs_inode_t **ipp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | xfs_inode_t *ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | int error; |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 424 | xfs_perag_t *pag; |
| 425 | xfs_agino_t agino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Christoph Hellwig | d276734 | 2010-10-06 18:31:23 +0000 | [diff] [blame] | 427 | /* reject inode numbers outside existing AGs */ |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 428 | if (!ino || XFS_INO_TO_AGNO(mp, ino) >= mp->m_sb.sb_agcount) |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 429 | return EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 431 | /* get the perag structure and ensure that it's inode capable */ |
Dave Chinner | 5017e97 | 2010-01-11 11:47:40 +0000 | [diff] [blame] | 432 | pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino)); |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 433 | agino = XFS_INO_TO_AGINO(mp, ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | again: |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 436 | error = 0; |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 437 | rcu_read_lock(); |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 438 | ip = radix_tree_lookup(&pag->pag_ici_root, agino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 440 | if (ip) { |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 441 | error = xfs_iget_cache_hit(pag, ip, ino, flags, lock_flags); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 442 | if (error) |
| 443 | goto out_error_or_again; |
| 444 | } else { |
Dave Chinner | 1a3e8f3 | 2010-12-17 17:29:43 +1100 | [diff] [blame] | 445 | rcu_read_unlock(); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 446 | XFS_STATS_INC(xs_ig_missed); |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 447 | |
Dave Chinner | 7b6259e | 2010-06-24 11:35:17 +1000 | [diff] [blame] | 448 | error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip, |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 449 | flags, lock_flags); |
| 450 | if (error) |
| 451 | goto out_error_or_again; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
Dave Chinner | 5017e97 | 2010-01-11 11:47:40 +0000 | [diff] [blame] | 453 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | *ipp = ip; |
| 456 | |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 457 | ASSERT(ip->i_df.if_ext_max == |
| 458 | XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t)); |
Christoph Hellwig | 41be8be | 2008-08-13 16:23:13 +1000 | [diff] [blame] | 459 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | * If we have a real type for an on-disk inode, we can set ops(&unlock) |
| 461 | * now. If it's a new inode being created, xfs_ialloc will handle it. |
| 462 | */ |
David Chinner | bf90424 | 2008-10-30 17:36:14 +1100 | [diff] [blame] | 463 | if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0) |
Christoph Hellwig | 41be8be | 2008-08-13 16:23:13 +1000 | [diff] [blame] | 464 | xfs_setup_inode(ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | return 0; |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 466 | |
| 467 | out_error_or_again: |
| 468 | if (error == EAGAIN) { |
| 469 | delay(1); |
| 470 | goto again; |
| 471 | } |
Dave Chinner | 5017e97 | 2010-01-11 11:47:40 +0000 | [diff] [blame] | 472 | xfs_perag_put(pag); |
David Chinner | 6441e54 | 2008-10-30 17:21:19 +1100 | [diff] [blame] | 473 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | } |
| 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | * This is a wrapper routine around the xfs_ilock() routine |
| 478 | * used to centralize some grungy code. It is used in places |
| 479 | * that wish to lock the inode solely for reading the extents. |
| 480 | * The reason these places can't just call xfs_ilock(SHARED) |
| 481 | * is that the inode lock also guards to bringing in of the |
| 482 | * extents from disk for a file in b-tree format. If the inode |
| 483 | * is in b-tree format, then we need to lock the inode exclusively |
| 484 | * until the extents are read in. Locking it exclusively all |
| 485 | * the time would limit our parallelism unnecessarily, though. |
| 486 | * What we do instead is check to see if the extents have been |
| 487 | * read in yet, and only lock the inode exclusively if they |
| 488 | * have not. |
| 489 | * |
| 490 | * The function returns a value which should be given to the |
| 491 | * corresponding xfs_iunlock_map_shared(). This value is |
| 492 | * the mode in which the lock was actually taken. |
| 493 | */ |
| 494 | uint |
| 495 | xfs_ilock_map_shared( |
| 496 | xfs_inode_t *ip) |
| 497 | { |
| 498 | uint lock_mode; |
| 499 | |
| 500 | if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) && |
| 501 | ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) { |
| 502 | lock_mode = XFS_ILOCK_EXCL; |
| 503 | } else { |
| 504 | lock_mode = XFS_ILOCK_SHARED; |
| 505 | } |
| 506 | |
| 507 | xfs_ilock(ip, lock_mode); |
| 508 | |
| 509 | return lock_mode; |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * This is simply the unlock routine to go with xfs_ilock_map_shared(). |
| 514 | * All it does is call xfs_iunlock() with the given lock_mode. |
| 515 | */ |
| 516 | void |
| 517 | xfs_iunlock_map_shared( |
| 518 | xfs_inode_t *ip, |
| 519 | unsigned int lock_mode) |
| 520 | { |
| 521 | xfs_iunlock(ip, lock_mode); |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * The xfs inode contains 2 locks: a multi-reader lock called the |
| 526 | * i_iolock and a multi-reader lock called the i_lock. This routine |
| 527 | * allows either or both of the locks to be obtained. |
| 528 | * |
| 529 | * The 2 locks should always be ordered so that the IO lock is |
| 530 | * obtained first in order to prevent deadlock. |
| 531 | * |
| 532 | * ip -- the inode being locked |
| 533 | * lock_flags -- this parameter indicates the inode's locks |
| 534 | * to be locked. It can be: |
| 535 | * XFS_IOLOCK_SHARED, |
| 536 | * XFS_IOLOCK_EXCL, |
| 537 | * XFS_ILOCK_SHARED, |
| 538 | * XFS_ILOCK_EXCL, |
| 539 | * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED, |
| 540 | * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL, |
| 541 | * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED, |
| 542 | * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
| 543 | */ |
| 544 | void |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 545 | xfs_ilock( |
| 546 | xfs_inode_t *ip, |
| 547 | uint lock_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | { |
| 549 | /* |
| 550 | * You can't set both SHARED and EXCL for the same lock, |
| 551 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, |
| 552 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. |
| 553 | */ |
| 554 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != |
| 555 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); |
| 556 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != |
| 557 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 558 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 560 | if (lock_flags & XFS_IOLOCK_EXCL) |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 561 | mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 562 | else if (lock_flags & XFS_IOLOCK_SHARED) |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 563 | mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 564 | |
| 565 | if (lock_flags & XFS_ILOCK_EXCL) |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 566 | mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 567 | else if (lock_flags & XFS_ILOCK_SHARED) |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 568 | mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 569 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 570 | trace_xfs_ilock(ip, lock_flags, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | /* |
| 574 | * This is just like xfs_ilock(), except that the caller |
| 575 | * is guaranteed not to sleep. It returns 1 if it gets |
| 576 | * the requested locks and 0 otherwise. If the IO lock is |
| 577 | * obtained but the inode lock cannot be, then the IO lock |
| 578 | * is dropped before returning. |
| 579 | * |
| 580 | * ip -- the inode being locked |
| 581 | * lock_flags -- this parameter indicates the inode's locks to be |
| 582 | * to be locked. See the comment for xfs_ilock() for a list |
| 583 | * of valid values. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | */ |
| 585 | int |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 586 | xfs_ilock_nowait( |
| 587 | xfs_inode_t *ip, |
| 588 | uint lock_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* |
| 591 | * You can't set both SHARED and EXCL for the same lock, |
| 592 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, |
| 593 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. |
| 594 | */ |
| 595 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != |
| 596 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); |
| 597 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != |
| 598 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 599 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | if (lock_flags & XFS_IOLOCK_EXCL) { |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 602 | if (!mrtryupdate(&ip->i_iolock)) |
| 603 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } else if (lock_flags & XFS_IOLOCK_SHARED) { |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 605 | if (!mrtryaccess(&ip->i_iolock)) |
| 606 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | if (lock_flags & XFS_ILOCK_EXCL) { |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 609 | if (!mrtryupdate(&ip->i_lock)) |
| 610 | goto out_undo_iolock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } else if (lock_flags & XFS_ILOCK_SHARED) { |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 612 | if (!mrtryaccess(&ip->i_lock)) |
| 613 | goto out_undo_iolock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 615 | trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | return 1; |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 617 | |
| 618 | out_undo_iolock: |
| 619 | if (lock_flags & XFS_IOLOCK_EXCL) |
| 620 | mrunlock_excl(&ip->i_iolock); |
| 621 | else if (lock_flags & XFS_IOLOCK_SHARED) |
| 622 | mrunlock_shared(&ip->i_iolock); |
| 623 | out: |
| 624 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | /* |
| 628 | * xfs_iunlock() is used to drop the inode locks acquired with |
| 629 | * xfs_ilock() and xfs_ilock_nowait(). The caller must pass |
| 630 | * in the flags given to xfs_ilock() or xfs_ilock_nowait() so |
| 631 | * that we know which locks to drop. |
| 632 | * |
| 633 | * ip -- the inode being unlocked |
| 634 | * lock_flags -- this parameter indicates the inode's locks to be |
| 635 | * to be unlocked. See the comment for xfs_ilock() for a list |
| 636 | * of valid values for this parameter. |
| 637 | * |
| 638 | */ |
| 639 | void |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 640 | xfs_iunlock( |
| 641 | xfs_inode_t *ip, |
| 642 | uint lock_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
| 644 | /* |
| 645 | * You can't set both SHARED and EXCL for the same lock, |
| 646 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, |
| 647 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. |
| 648 | */ |
| 649 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != |
| 650 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); |
| 651 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != |
| 652 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); |
Lachlan McIlroy | f7c66ce | 2007-05-08 13:50:19 +1000 | [diff] [blame] | 653 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY | |
| 654 | XFS_LOCK_DEP_MASK)) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | ASSERT(lock_flags != 0); |
| 656 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 657 | if (lock_flags & XFS_IOLOCK_EXCL) |
| 658 | mrunlock_excl(&ip->i_iolock); |
| 659 | else if (lock_flags & XFS_IOLOCK_SHARED) |
| 660 | mrunlock_shared(&ip->i_iolock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 662 | if (lock_flags & XFS_ILOCK_EXCL) |
| 663 | mrunlock_excl(&ip->i_lock); |
| 664 | else if (lock_flags & XFS_ILOCK_SHARED) |
| 665 | mrunlock_shared(&ip->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 667 | if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) && |
| 668 | !(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* |
| 670 | * Let the AIL know that this item has been unlocked in case |
| 671 | * it is in the AIL and anyone is waiting on it. Don't do |
| 672 | * this if the caller has asked us not to. |
| 673 | */ |
David Chinner | 783a2f6 | 2008-10-30 17:39:58 +1100 | [diff] [blame] | 674 | xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp, |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 675 | (xfs_log_item_t*)(ip->i_itemp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 677 | trace_xfs_iunlock(ip, lock_flags, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /* |
| 681 | * give up write locks. the i/o lock cannot be held nested |
| 682 | * if it is being demoted. |
| 683 | */ |
| 684 | void |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 685 | xfs_ilock_demote( |
| 686 | xfs_inode_t *ip, |
| 687 | uint lock_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | { |
| 689 | ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)); |
| 690 | ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); |
| 691 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 692 | if (lock_flags & XFS_ILOCK_EXCL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | mrdemote(&ip->i_lock); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 694 | if (lock_flags & XFS_IOLOCK_EXCL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | mrdemote(&ip->i_iolock); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 696 | |
| 697 | trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
| 699 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 700 | #ifdef DEBUG |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 701 | int |
| 702 | xfs_isilocked( |
| 703 | xfs_inode_t *ip, |
| 704 | uint lock_flags) |
| 705 | { |
Christoph Hellwig | f936972 | 2010-06-03 16:22:29 +1000 | [diff] [blame] | 706 | if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { |
| 707 | if (!(lock_flags & XFS_ILOCK_SHARED)) |
| 708 | return !!ip->i_lock.mr_writer; |
| 709 | return rwsem_is_locked(&ip->i_lock.mr_lock); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 710 | } |
| 711 | |
Christoph Hellwig | f936972 | 2010-06-03 16:22:29 +1000 | [diff] [blame] | 712 | if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { |
| 713 | if (!(lock_flags & XFS_IOLOCK_SHARED)) |
| 714 | return !!ip->i_iolock.mr_writer; |
| 715 | return rwsem_is_locked(&ip->i_iolock.mr_lock); |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 716 | } |
| 717 | |
Christoph Hellwig | f936972 | 2010-06-03 16:22:29 +1000 | [diff] [blame] | 718 | ASSERT(0); |
| 719 | return 0; |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 720 | } |
| 721 | #endif |