1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Lustre filesystem abstraction routines
7 * Copyright (C) 2004 Cluster File Systems, Inc.
9 * This file is part of Lustre, http://www.lustre.org.
11 * Lustre is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
15 * Lustre is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with Lustre; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define DEBUG_SUBSYSTEM S_SM
27 #include <linux/kmod.h>
28 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32 #include <linux/obd_class.h>
33 #include <linux/obd_support.h>
34 #include <linux/lustre_lib.h>
35 #include <linux/lustre_idl.h>
36 #include <linux/lustre_fsfilt.h>
37 #include <linux/lustre_smfs.h>
38 #include "smfs_internal.h"
40 static void smfs_init_inode_info (struct inode *inode, void *opaque)
42 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
43 struct inode *cache_inode = NULL;
46 cache_inode = iget(S2CSB(inode->i_sb), sargs->s_ino);
48 cache_inode = iget(S2CSB(inode->i_sb), inode->i_ino);
50 OBD_ALLOC(I2SMI(inode), sizeof(struct smfs_inode_info));
51 LASSERT(I2SMI(inode));
52 I2CI(inode) = cache_inode;
53 CDEBUG(D_INODE, "cache_inode i_count ino %lu i_count %d\n",
54 cache_inode->i_ino, atomic_read(&cache_inode->i_count));
55 post_smfs_inode(inode, cache_inode);
56 sm_set_inode_ops(cache_inode, inode);
58 struct inode *dir = sargs->s_inode;
60 I2SMI(inode)->smi_flags = I2SMI(dir)->smi_flags;
64 static void smfs_clear_inode_info(struct inode *inode)
67 struct inode *cache_inode = I2CI(inode);
68 LASSERTF(((atomic_read(&cache_inode->i_count) == 0) ||
69 cache_inode == cache_inode->i_sb->s_root->d_inode),
70 "inode %p cache inode %p %lu i_count %d != 0 \n",
71 inode, cache_inode, cache_inode->i_ino,
72 atomic_read(&cache_inode->i_count));
74 OBD_FREE(I2SMI(inode), sizeof(struct smfs_inode_info));
79 static void smfs_read_inode2(struct inode *inode, void *opaque)
86 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
87 smfs_init_inode_info(inode, opaque);
88 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
89 inode->i_ino, atomic_read(&inode->i_count));
94 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
95 static int smfs_test_inode(struct inode *inode, unsigned long ino,
98 static int smfs_test_inode(struct inode *inode, void *opaque)
101 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
106 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
107 if (inode->i_ino != sargs->s_ino)
111 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
112 !smfs_snap_test_inode(inode, opaque))
118 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
119 int smfs_set_inode(struct inode *inode, void *opaque)
121 smfs_read_inode2(inode, opaque);
125 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
126 struct smfs_iget_args *sargs)
132 inode = iget5_locked(sb, hash, smfs_test_inode, smfs_set_inode, sargs);
134 if (inode->i_state & I_NEW)
135 unlock_new_inode(inode);
136 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p) index %d ino %lu \n",
137 inode->i_ino, inode->i_generation, inode, sargs->s_index,
144 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
145 struct smfs_iget_args *sargs)
150 inode = iget4(sb, hash, smfs_test_inode, sargs);
153 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
154 inode->i_generation, inode);
158 struct inode *smfs_get_inode (struct super_block *sb, ino_t hash,
159 struct inode *dir, int index)
162 struct smfs_iget_args sargs;
165 sargs.s_index = index;
168 inode = smfs_iget(sb, hash, &sargs);
173 static void smfs_delete_inode(struct inode *inode)
175 struct inode *cache_inode;
178 cache_inode = I2CI(inode);
180 if (!cache_inode || !S2CSB(inode->i_sb))
183 /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
184 * before smfs_delete inode, So we need to dec it to 1 before we call
185 * delete_inode of the bellow cache filesystem Check again latter. */
187 if (atomic_read(&cache_inode->i_count) < 1)
190 while (atomic_read(&cache_inode->i_count) != 1)
191 atomic_dec(&cache_inode->i_count);
193 pre_smfs_inode(inode, cache_inode);
195 if (atomic_read(&cache_inode->i_count) < 1)
198 while (atomic_read(&cache_inode->i_count) != 1) {
199 atomic_dec(&cache_inode->i_count);
202 pre_smfs_inode(inode, cache_inode);
204 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
205 list_del(&cache_inode->i_hash);
206 INIT_LIST_HEAD(&cache_inode->i_hash);
208 hlist_del_init(&cache_inode->i_hash);
210 list_del(&cache_inode->i_list);
211 INIT_LIST_HEAD(&cache_inode->i_list);
213 if (cache_inode->i_data.nrpages)
214 truncate_inode_pages(&cache_inode->i_data, 0);
216 if (S2CSB(inode->i_sb)->s_op->delete_inode)
217 S2CSB(inode->i_sb)->s_op->delete_inode(cache_inode);
219 post_smfs_inode(inode, cache_inode);
225 static void smfs_write_inode(struct inode *inode, int wait)
227 struct inode *cache_inode;
230 cache_inode = I2CI(inode);
233 CWARN("cache inode null\n");
236 pre_smfs_inode(inode, cache_inode);
237 if (S2CSB(inode->i_sb)->s_op->write_inode)
238 S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
240 post_smfs_inode(inode, cache_inode);
244 static void smfs_dirty_inode(struct inode *inode)
246 struct inode *cache_inode;
249 cache_inode = I2CI(inode);
251 if (!cache_inode || !S2CSB(inode->i_sb))
254 pre_smfs_inode(inode, cache_inode);
255 if (S2CSB(inode->i_sb)->s_op->dirty_inode)
256 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
258 post_smfs_inode(inode, cache_inode);
262 static void smfs_put_inode(struct inode *inode)
264 struct inode *cache_inode;
267 cache_inode = I2CI(inode);
270 CWARN("cache inode null\n");
274 if (atomic_read(&cache_inode->i_count) > 0) {
278 if (S2CSB(inode->i_sb)->s_op->put_inode)
279 S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
284 static void smfs_write_super(struct super_block *sb)
291 if (S2CSB(sb)->s_op->write_super)
292 S2CSB(sb)->s_op->write_super(S2CSB(sb));
293 duplicate_sb(sb, S2CSB(sb));
298 static void smfs_clear_inode(struct inode *inode)
300 struct inode *cache_inode;
306 cache_inode = I2CI(inode);
308 smfs_clear_inode_info(inode);
314 static void smfs_write_super_lockfs(struct super_block *sb)
316 struct super_block *cache_sb;
319 cache_sb = S2CSB(sb);
323 if (cache_sb->s_op->write_super_lockfs)
324 cache_sb->s_op->write_super_lockfs(cache_sb);
326 duplicate_sb(sb, cache_sb);
330 static void smfs_unlockfs(struct super_block *sb)
332 struct super_block *cache_sb;
335 cache_sb = S2CSB(sb);
339 if (cache_sb->s_op->unlockfs)
340 cache_sb->s_op->unlockfs(cache_sb);
342 duplicate_sb(sb, cache_sb);
346 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
347 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
349 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
352 struct super_block *cache_sb;
356 cache_sb = S2CSB(sb);
360 if (cache_sb->s_op->statfs)
361 rc = cache_sb->s_op->statfs(cache_sb, buf);
363 duplicate_sb(sb, cache_sb);
367 static int smfs_remount(struct super_block *sb, int *flags, char *data)
369 struct super_block *cache_sb;
373 cache_sb = S2CSB(sb);
378 if (cache_sb->s_op->remount_fs)
379 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
381 duplicate_sb(sb, cache_sb);
384 struct super_operations smfs_super_ops = {
385 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
386 .read_inode2 = smfs_read_inode2,
388 .clear_inode = smfs_clear_inode,
389 .put_super = smfs_put_super,
390 .delete_inode = smfs_delete_inode,
391 .write_inode = smfs_write_inode,
392 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
393 .put_inode = smfs_put_inode, /* BKL not held. */
394 .write_super = smfs_write_super, /* BKL held */
395 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
396 .unlockfs = smfs_unlockfs, /* BKL not held. */
397 .statfs = smfs_statfs, /* BKL held */
398 .remount_fs = smfs_remount, /* BKL held */
401 int is_smfs_sb(struct super_block *sb)
403 return (sb->s_op->put_super == smfs_super_ops.put_super);
405 EXPORT_SYMBOL(is_smfs_sb);