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;
45 cache_inode = iget(S2CSB(inode->i_sb), inode->i_ino);
47 OBD_ALLOC(I2SMI(inode), sizeof(struct smfs_inode_info));
48 LASSERT(I2SMI(inode));
49 I2CI(inode) = cache_inode;
50 CDEBUG(D_INODE, "cache_inode i_count ino %lu i_count %d\n",
51 cache_inode->i_ino, atomic_read(&cache_inode->i_count));
52 post_smfs_inode(inode, cache_inode);
53 sm_set_inode_ops(cache_inode, inode);
56 struct inode *dir = sargs->s_inode;
59 I2SMI(inode)->smi_flags = I2SMI(dir)->smi_flags;
63 static void smfs_clear_inode_info(struct inode *inode)
65 struct inode *cache_inode = I2CI(inode);
67 LASSERTF(atomic_read(&cache_inode->i_count) == 1,
68 "cache inode %lu i_count %d not 0\n", cache_inode->i_ino,
69 atomic_read(&cache_inode->i_count));
71 OBD_FREE(I2SMI(inode), sizeof(struct smfs_inode_info));
74 static void smfs_read_inode2(struct inode *inode, void *opaque)
81 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
82 smfs_init_inode_info(inode, opaque);
83 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
84 inode->i_ino, atomic_read(&inode->i_count));
89 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
90 static int smfs_test_inode(struct inode *inode, unsigned long ino,
93 static int smfs_test_inode(struct inode *inode, void *opaque)
96 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
101 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
102 if (inode->i_ino != sargs->s_ino)
106 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
107 !smfs_snap_test_inode(inode, opaque))
113 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
114 int smfs_set_inode(struct inode *inode, void *opaque)
116 smfs_read_inode2(inode, opaque);
120 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
121 struct smfs_iget_args *sargs)
127 inode = iget5_locked(sb, hash, smfs_test_inode, smfs_set_inode, sargs);
129 if (inode->i_state & I_NEW)
130 unlock_new_inode(inode);
131 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
132 inode->i_generation, inode);
137 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
138 struct smfs_iget_args *sargs)
143 inode = iget4(sb, hash, smfs_test_inode, sargs);
146 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
147 inode->i_generation, inode);
151 struct inode *smfs_get_inode (struct super_block *sb, ino_t hash,
152 struct inode *dir, int index)
154 struct inode *inode = NULL;
155 struct smfs_iget_args sargs;
158 sargs.s_index = index;
159 sargs.s_inode = inode;
161 inode = smfs_iget(sb, hash, &sargs);
166 static void smfs_delete_inode(struct inode *inode)
168 struct inode *cache_inode;
171 cache_inode = I2CI(inode);
173 if (!cache_inode || !S2CSB(inode->i_sb))
176 /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
177 * before smfs_delete inode, So we need to dec it to 1 before we call
178 * delete_inode of the bellow cache filesystem Check again latter. */
180 if (atomic_read(&cache_inode->i_count) < 1)
183 while (atomic_read(&cache_inode->i_count) != 1)
184 atomic_dec(&cache_inode->i_count);
186 pre_smfs_inode(inode, cache_inode);
188 if (atomic_read(&cache_inode->i_count) < 1)
191 while (atomic_read(&cache_inode->i_count) != 1) {
192 atomic_dec(&cache_inode->i_count);
195 pre_smfs_inode(inode, cache_inode);
197 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
198 list_del(&cache_inode->i_hash);
199 INIT_LIST_HEAD(&cache_inode->i_hash);
201 hlist_del_init(&cache_inode->i_hash);
203 list_del(&cache_inode->i_list);
204 INIT_LIST_HEAD(&cache_inode->i_list);
206 if (cache_inode->i_data.nrpages)
207 truncate_inode_pages(&cache_inode->i_data, 0);
209 if (S2CSB(inode->i_sb)->s_op->delete_inode)
210 S2CSB(inode->i_sb)->s_op->delete_inode(cache_inode);
212 post_smfs_inode(inode, cache_inode);
218 static void smfs_write_inode(struct inode *inode, int wait)
220 struct inode *cache_inode;
223 cache_inode = I2CI(inode);
226 CWARN("cache inode null\n");
229 pre_smfs_inode(inode, cache_inode);
230 if (S2CSB(inode->i_sb)->s_op->write_inode)
231 S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
233 post_smfs_inode(inode, cache_inode);
237 static void smfs_dirty_inode(struct inode *inode)
239 struct inode *cache_inode;
242 cache_inode = I2CI(inode);
244 if (!cache_inode || !S2CSB(inode->i_sb))
247 pre_smfs_inode(inode, cache_inode);
248 if (S2CSB(inode->i_sb)->s_op->dirty_inode)
249 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
251 post_smfs_inode(inode, cache_inode);
255 static void smfs_put_inode(struct inode *inode)
257 struct inode *cache_inode;
260 cache_inode = I2CI(inode);
263 CWARN("cache inode null\n");
267 CDEBUG(D_INFO, "cache_inode i_count ino %lu i_count %d\n",
268 inode->i_ino, atomic_read(&inode->i_count));
269 if (atomic_read(&cache_inode->i_count) > 1 &&
270 cache_inode != cache_inode->i_sb->s_root->d_inode) {
271 CDEBUG(D_INFO, "cache_inode i_count ino %lu i_count %d\n",
273 atomic_read(&cache_inode->i_count) - 1);
277 if (S2CSB(inode->i_sb)->s_op->put_inode)
278 S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
283 static void smfs_write_super(struct super_block *sb)
290 if (S2CSB(sb)->s_op->write_super)
291 S2CSB(sb)->s_op->write_super(S2CSB(sb));
292 duplicate_sb(sb, S2CSB(sb));
297 static void smfs_clear_inode(struct inode *inode)
299 struct inode *cache_inode;
305 cache_inode = I2CI(inode);
307 if (cache_inode != cache_inode->i_sb->s_root->d_inode)
308 smfs_clear_inode_info(inode);
313 static void smfs_write_super_lockfs(struct super_block *sb)
315 struct super_block *cache_sb;
318 cache_sb = S2CSB(sb);
322 if (cache_sb->s_op->write_super_lockfs)
323 cache_sb->s_op->write_super_lockfs(cache_sb);
325 duplicate_sb(sb, cache_sb);
329 static void smfs_unlockfs(struct super_block *sb)
331 struct super_block *cache_sb;
334 cache_sb = S2CSB(sb);
338 if (cache_sb->s_op->unlockfs)
339 cache_sb->s_op->unlockfs(cache_sb);
341 duplicate_sb(sb, cache_sb);
345 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
346 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
348 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
351 struct super_block *cache_sb;
355 cache_sb = S2CSB(sb);
359 if (cache_sb->s_op->statfs)
360 rc = cache_sb->s_op->statfs(cache_sb, buf);
362 duplicate_sb(sb, cache_sb);
366 static int smfs_remount(struct super_block *sb, int *flags, char *data)
368 struct super_block *cache_sb;
372 cache_sb = S2CSB(sb);
377 if (cache_sb->s_op->remount_fs)
378 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
380 duplicate_sb(sb, cache_sb);
383 struct super_operations smfs_super_ops = {
384 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
385 .read_inode2 = smfs_read_inode2,
387 .clear_inode = smfs_clear_inode,
388 .put_super = smfs_put_super,
389 .delete_inode = smfs_delete_inode,
390 .write_inode = smfs_write_inode,
391 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
392 .put_inode = smfs_put_inode, /* BKL not held. */
393 .write_super = smfs_write_super, /* BKL held */
394 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
395 .unlockfs = smfs_unlockfs, /* BKL not held. */
396 .statfs = smfs_statfs, /* BKL held */
397 .remount_fs = smfs_remount, /* BKL held */
400 int is_smfs_sb(struct super_block *sb)
402 return (sb->s_op->put_super == smfs_super_ops.put_super);
404 EXPORT_SYMBOL(is_smfs_sb);