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_read_inode(struct inode *inode)
42 struct inode *cache_inode;
48 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
50 cache_inode = iget(S2CSB(inode->i_sb), inode->i_ino);
52 I2CI(inode) = cache_inode;
54 post_smfs_inode(inode, cache_inode);
55 sm_set_inode_ops(cache_inode, inode);
57 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
58 inode->i_ino, atomic_read(&inode->i_count));
62 static void smfs_read_inode2(struct inode *inode, void *opaque)
64 struct inode *cache_inode;
70 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
72 cache_inode = iget(S2CSB(inode->i_sb), inode->i_ino);
75 I2SMI(inode)->smi_flags = *((int *)opaque);
77 I2CI(inode) = cache_inode;
79 post_smfs_inode(inode, cache_inode);
80 sm_set_inode_ops(cache_inode, inode);
82 if (SMFS_DO_COW(S2SMI(inode->i_sb))) {
83 smfs_init_snap_inode_info(inode, *((int *)opaque));
86 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
87 inode->i_ino, atomic_read(&inode->i_count));
91 /* Although some filesystem(such as ext3) do not have
92 * clear_inode method, but we need it to free the
95 static void smfs_clear_inode(struct inode *inode)
97 struct inode *cache_inode;
103 cache_inode = I2CI(inode);
105 /* FIXME: because i_count of cache_inode may not
106 * be 0 or 1 in before smfs_delete inode, So we
107 * need to dec it to 1 before we call delete_inode
108 * of the bellow cache filesystem Check again latter. */
109 if (cache_inode != cache_inode->i_sb->s_root->d_inode) {
110 struct list_head *lp;
112 while (!list_empty(&cache_inode->i_dentry)) {
113 lp = cache_inode->i_dentry.next;
114 tmp = list_entry(lp, struct dentry, d_alias);
115 if (atomic_read(&tmp->d_count) >= 1)
116 post_smfs_dentry(tmp);
118 if (atomic_read(&cache_inode->i_count) < 1)
121 while (atomic_read(&cache_inode->i_count) != 1) {
122 atomic_dec(&cache_inode->i_count);
125 SMFS_CLEAN_INODE_REC(inode);
131 static void smfs_delete_inode(struct inode *inode)
133 struct inode *cache_inode;
136 cache_inode = I2CI(inode);
138 if (!cache_inode || !S2CSB(inode->i_sb))
141 /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
142 * before smfs_delete inode, So we need to dec it to 1 before we call
143 * delete_inode of the bellow cache filesystem Check again latter. */
145 if (atomic_read(&cache_inode->i_count) < 1)
148 while (atomic_read(&cache_inode->i_count) != 1)
149 atomic_dec(&cache_inode->i_count);
151 pre_smfs_inode(inode, cache_inode);
153 if (atomic_read(&cache_inode->i_count) < 1)
156 while (atomic_read(&cache_inode->i_count) != 1) {
157 atomic_dec(&cache_inode->i_count);
160 pre_smfs_inode(inode, cache_inode);
162 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
163 list_del(&cache_inode->i_hash);
164 INIT_LIST_HEAD(&cache_inode->i_hash);
166 hlist_del_init(&cache_inode->i_hash);
169 list_del(&cache_inode->i_list);
170 INIT_LIST_HEAD(&cache_inode->i_list);
172 if (cache_inode->i_data.nrpages)
173 truncate_inode_pages(&cache_inode->i_data, 0);
175 if (S2CSB(inode->i_sb)->s_op->delete_inode)
176 S2CSB(inode->i_sb)->s_op->delete_inode(cache_inode);
178 post_smfs_inode(inode, cache_inode);
184 static void smfs_write_inode(struct inode *inode, int wait)
186 struct inode *cache_inode;
189 cache_inode = I2CI(inode);
192 CWARN("cache inode null\n");
195 pre_smfs_inode(inode, cache_inode);
197 if (S2CSB(inode->i_sb)->s_op->write_inode)
198 S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
203 static void smfs_dirty_inode(struct inode *inode)
205 struct inode *cache_inode;
208 cache_inode = I2CI(inode);
210 if (!cache_inode || !S2CSB(inode->i_sb))
213 pre_smfs_inode(inode, cache_inode);
214 if (S2CSB(inode->i_sb)->s_op->dirty_inode)
215 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
217 post_smfs_inode(inode, cache_inode);
221 static void smfs_put_inode(struct inode *inode)
223 struct inode *cache_inode;
226 cache_inode = I2CI(inode);
229 CWARN("cache inode null\n");
232 if (S2CSB(inode->i_sb)->s_op->put_inode)
233 S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
238 static void smfs_write_super(struct super_block *sb)
245 if (S2CSB(sb)->s_op->write_super)
246 S2CSB(sb)->s_op->write_super(S2CSB(sb));
247 duplicate_sb(sb, S2CSB(sb));
251 static void smfs_write_super_lockfs(struct super_block *sb)
253 struct super_block *cache_sb;
256 cache_sb = S2CSB(sb);
260 if (cache_sb->s_op->write_super_lockfs)
261 cache_sb->s_op->write_super_lockfs(cache_sb);
263 duplicate_sb(sb, cache_sb);
267 static void smfs_unlockfs(struct super_block *sb)
269 struct super_block *cache_sb;
272 cache_sb = S2CSB(sb);
276 if (cache_sb->s_op->unlockfs)
277 cache_sb->s_op->unlockfs(cache_sb);
279 duplicate_sb(sb, cache_sb);
283 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
284 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
286 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
289 struct super_block *cache_sb;
293 cache_sb = S2CSB(sb);
297 if (cache_sb->s_op->statfs)
298 rc = cache_sb->s_op->statfs(cache_sb, buf);
300 duplicate_sb(sb, cache_sb);
305 static int smfs_remount(struct super_block *sb, int *flags, char *data)
307 struct super_block *cache_sb;
311 cache_sb = S2CSB(sb);
316 if (cache_sb->s_op->remount_fs)
317 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
319 duplicate_sb(sb, cache_sb);
323 struct super_operations smfs_super_ops = {
324 .read_inode = smfs_read_inode,
325 .read_inode2 = smfs_read_inode2,
326 .clear_inode = smfs_clear_inode,
327 .put_super = smfs_put_super,
328 .delete_inode = smfs_delete_inode,
329 .write_inode = smfs_write_inode,
330 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
331 .put_inode = smfs_put_inode, /* BKL not held. */
332 .write_super = smfs_write_super, /* BKL held */
333 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
334 .unlockfs = smfs_unlockfs, /* BKL not held. */
335 .statfs = smfs_statfs, /* BKL held */
336 .remount_fs = smfs_remount, /* BKL held */