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);
83 smfs_init_snap_inode_info(inode, *((int *)opaque));
85 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
86 inode->i_ino, atomic_read(&inode->i_count));
90 /* Although some filesystem(such as ext3) do not have
91 * clear_inode method, but we need it to free the
94 static void smfs_clear_inode(struct inode *inode)
96 struct inode *cache_inode;
102 cache_inode = I2CI(inode);
104 /* FIXME: because i_count of cache_inode may not
105 * be 0 or 1 in before smfs_delete inode, So we
106 * need to dec it to 1 before we call delete_inode
107 * of the bellow cache filesystem Check again latter. */
108 if (cache_inode != cache_inode->i_sb->s_root->d_inode) {
109 struct list_head *lp;
111 while (!list_empty(&cache_inode->i_dentry)) {
112 lp = cache_inode->i_dentry.next;
113 tmp = list_entry(lp, struct dentry, d_alias);
114 if (atomic_read(&tmp->d_count) >= 1)
115 post_smfs_dentry(tmp);
117 if (atomic_read(&cache_inode->i_count) < 1)
120 while (atomic_read(&cache_inode->i_count) != 1) {
121 atomic_dec(&cache_inode->i_count);
124 SMFS_CLEAN_INODE_REC(inode);
130 static void smfs_delete_inode(struct inode *inode)
132 struct inode *cache_inode;
135 cache_inode = I2CI(inode);
137 if (!cache_inode || !S2CSB(inode->i_sb))
140 /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
141 * before smfs_delete inode, So we need to dec it to 1 before we call
142 * delete_inode of the bellow cache filesystem Check again latter. */
144 if (atomic_read(&cache_inode->i_count) < 1)
147 while (atomic_read(&cache_inode->i_count) != 1)
148 atomic_dec(&cache_inode->i_count);
150 pre_smfs_inode(inode, cache_inode);
152 if (atomic_read(&cache_inode->i_count) < 1)
155 while (atomic_read(&cache_inode->i_count) != 1) {
156 atomic_dec(&cache_inode->i_count);
159 pre_smfs_inode(inode, cache_inode);
161 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
162 list_del(&cache_inode->i_hash);
163 INIT_LIST_HEAD(&cache_inode->i_hash);
165 hlist_del_init(&cache_inode->i_hash);
168 list_del(&cache_inode->i_list);
169 INIT_LIST_HEAD(&cache_inode->i_list);
171 if (cache_inode->i_data.nrpages)
172 truncate_inode_pages(&cache_inode->i_data, 0);
174 if (S2CSB(inode->i_sb)->s_op->delete_inode)
175 S2CSB(inode->i_sb)->s_op->delete_inode(cache_inode);
177 post_smfs_inode(inode, cache_inode);
183 static void smfs_write_inode(struct inode *inode, int wait)
185 struct inode *cache_inode;
188 cache_inode = I2CI(inode);
191 CWARN("cache inode null\n");
194 pre_smfs_inode(inode, cache_inode);
195 if (S2CSB(inode->i_sb)->s_op->write_inode)
196 S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
198 post_smfs_inode(inode, cache_inode);
202 static void smfs_dirty_inode(struct inode *inode)
204 struct inode *cache_inode;
207 cache_inode = I2CI(inode);
209 if (!cache_inode || !S2CSB(inode->i_sb))
212 pre_smfs_inode(inode, cache_inode);
213 if (S2CSB(inode->i_sb)->s_op->dirty_inode)
214 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
216 post_smfs_inode(inode, cache_inode);
220 static void smfs_put_inode(struct inode *inode)
222 struct inode *cache_inode;
225 cache_inode = I2CI(inode);
228 CWARN("cache inode null\n");
231 if (S2CSB(inode->i_sb)->s_op->put_inode)
232 S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
237 static void smfs_write_super(struct super_block *sb)
244 if (S2CSB(sb)->s_op->write_super)
245 S2CSB(sb)->s_op->write_super(S2CSB(sb));
246 duplicate_sb(sb, S2CSB(sb));
250 static void smfs_write_super_lockfs(struct super_block *sb)
252 struct super_block *cache_sb;
255 cache_sb = S2CSB(sb);
259 if (cache_sb->s_op->write_super_lockfs)
260 cache_sb->s_op->write_super_lockfs(cache_sb);
262 duplicate_sb(sb, cache_sb);
266 static void smfs_unlockfs(struct super_block *sb)
268 struct super_block *cache_sb;
271 cache_sb = S2CSB(sb);
275 if (cache_sb->s_op->unlockfs)
276 cache_sb->s_op->unlockfs(cache_sb);
278 duplicate_sb(sb, cache_sb);
282 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
283 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
285 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
288 struct super_block *cache_sb;
292 cache_sb = S2CSB(sb);
296 if (cache_sb->s_op->statfs)
297 rc = cache_sb->s_op->statfs(cache_sb, buf);
299 duplicate_sb(sb, cache_sb);
304 static int smfs_remount(struct super_block *sb, int *flags, char *data)
306 struct super_block *cache_sb;
310 cache_sb = S2CSB(sb);
315 if (cache_sb->s_op->remount_fs)
316 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
318 duplicate_sb(sb, cache_sb);
322 struct super_operations smfs_super_ops = {
323 .read_inode = smfs_read_inode,
324 .read_inode2 = smfs_read_inode2,
325 .clear_inode = smfs_clear_inode,
326 .put_super = smfs_put_super,
327 .delete_inode = smfs_delete_inode,
328 .write_inode = smfs_write_inode,
329 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
330 .put_inode = smfs_put_inode, /* BKL not held. */
331 .write_super = smfs_write_super, /* BKL held */
332 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
333 .unlockfs = smfs_unlockfs, /* BKL not held. */
334 .statfs = smfs_statfs, /* BKL held */
335 .remount_fs = smfs_remount, /* BKL held */