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)
43 struct inode *cache_inode = NULL;
44 struct smfs_iget_args *sargs = opaque;
46 LASSERTF((!I2SMI(inode)), "Inode %lu already has smfs_inode_info %p \n",
47 inode->i_ino, I2SMI(inode));
49 /* getting backing fs inode. */
52 cache_inode = igrab(sargs->s_inode);
55 OBD_ALLOC(inode->u.generic_ip, sizeof(struct smfs_inode_info));
57 LASSERT(inode->u.generic_ip);
59 I2CI(inode) = cache_inode;
60 CDEBUG(D_INODE,"Init inode #%lu (%p) icount %u, i_nlink %u\n",
62 atomic_read(&cache_inode->i_count),
63 cache_inode->i_nlink);
65 post_smfs_inode(inode, cache_inode);
66 inode->i_nlink = cache_inode->i_nlink;
67 sm_set_inode_ops(inode);
69 //inherit parent inode flags
71 I2SMI(inode)->smi_flags = sargs->s_info->smi_flags;
72 CDEBUG(D_INODE, "set inode %lu flags 0x%.8x\n", inode->i_ino,
73 I2SMI(inode)->smi_flags);
77 static void smfs_clear_inode_info(struct inode *inode)
79 struct inode *cache_inode = I2CI(inode);
80 struct smfs_inode_info * info = I2SMI(inode);
82 CDEBUG(D_INODE, "Clear_info: inode %lu (%p)\n", inode->i_ino, inode);
84 inode->u.generic_ip = NULL;
86 OBD_FREE(info, sizeof(*info));
89 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
90 static void smfs_read_inode2(struct inode *inode, void *opaque)
99 smfs_init_inode_info(inode, opaque);
100 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
101 inode->i_ino, atomic_read(&inode->i_count));
105 static int smfs_test_inode(struct inode *inode, unsigned long ino,
108 static int smfs_test_inode(struct inode *inode, void *opaque)
111 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
113 if (!sargs || (inode->i_ino != sargs->s_inode->i_ino))
117 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
118 !smfs_snap_test_inode(inode, opaque))
125 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
126 int smfs_set_inode(struct inode *inode, void *opaque)
128 struct smfs_iget_args *sargs = opaque;
130 inode->i_ino = sargs->s_inode->i_ino;
135 static struct inode *smfs_iget(struct super_block *sb, ino_t hash,
136 struct smfs_iget_args *sargs)
141 inode = iget5_locked(sb, hash, smfs_test_inode,
142 smfs_set_inode, sargs);
144 if (inode->i_state & I_NEW) {
145 smfs_init_inode_info(inode, (void*)sargs);
146 unlock_new_inode(inode);
149 CDEBUG(D_INODE, "inode: %lu/%u(%p) index %d\n",
150 inode->i_ino, inode->i_generation,
151 inode, sargs->s_index);
157 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
158 struct smfs_iget_args *sargs)
163 inode = iget4(sb, hash, smfs_test_inode, sargs);
165 struct inode *cache_inode = I2CI(inode);
167 CDEBUG(D_INODE, "new inode: %lu/%u(%p)\n", inode->i_ino,
168 inode->i_generation, inode);
174 struct inode *smfs_get_inode(struct super_block *sb, struct inode * cache_inode,
175 struct smfs_inode_info * dir_info, int index)
177 struct smfs_iget_args sargs;
181 sargs.s_inode = cache_inode;
182 sargs.s_info = dir_info;
183 sargs.s_index = index;
185 inode = smfs_iget(sb, cache_inode->i_ino, &sargs);
190 static int smfs_write_inode(struct inode *inode, int wait)
192 static void smfs_write_inode(struct inode *inode, int wait)
195 struct inode *cache_inode = I2CI(inode);
201 LASSERT(cache_inode);
203 CDEBUG(D_INODE,"Write inode %lu\n",inode->i_ino);
205 pre_smfs_inode(inode, cache_inode);
208 rc = cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
210 cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
212 post_smfs_inode(inode, cache_inode);
221 static void smfs_dirty_inode(struct inode *inode)
223 struct inode *cache_inode;
226 cache_inode = I2CI(inode);
227 LASSERT(cache_inode);
229 pre_smfs_inode(inode, cache_inode);
231 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
233 post_smfs_inode(inode, cache_inode);
237 static void smfs_delete_inode(struct inode *inode)
239 //struct inode * cache_inode = I2CI(inode);
241 //smfs_clear_inode_info(inode);
245 static void smfs_clear_inode(struct inode *inode)
247 smfs_clear_inode_info(inode);
250 static void smfs_write_super(struct super_block *sb)
256 S2CSB(sb)->s_op->write_super(S2CSB(sb));
257 duplicate_sb(sb, S2CSB(sb));
261 static void smfs_write_super_lockfs(struct super_block *sb)
263 struct super_block * cache_sb = S2CSB(sb);
268 cache_sb->s_op->write_super_lockfs(cache_sb);
269 duplicate_sb(sb, cache_sb);
273 static void smfs_unlockfs(struct super_block *sb)
275 struct super_block * cache_sb = S2CSB(sb);
280 cache_sb->s_op->unlockfs(cache_sb);
282 duplicate_sb(sb, cache_sb);
286 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
287 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
289 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
292 struct super_block *cache_sb = S2CSB(sb);
298 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 = S2CSB(sb);
312 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
313 duplicate_sb(sb, cache_sb);
318 struct super_operations smfs_super_ops = {
319 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
320 .read_inode2 = smfs_read_inode2,
322 .clear_inode = smfs_clear_inode,
323 .put_super = smfs_put_super,
324 .delete_inode = smfs_delete_inode,
325 .write_inode = smfs_write_inode,
326 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
327 .write_super = smfs_write_super, /* BKL held */
328 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
329 .unlockfs = smfs_unlockfs, /* BKL not held. */
330 .statfs = smfs_statfs, /* BKL held */
331 .remount_fs = smfs_remount, /* BKL held */