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 info #%lu (%p) icount %u\n", inode->i_ino, inode,
61 atomic_read(&cache_inode->i_count));
63 post_smfs_inode(inode, cache_inode);
64 sm_set_inode_ops(inode);
66 //inherit parent inode flags
68 I2SMI(inode)->smi_flags = sargs->s_info->smi_flags;
69 CDEBUG(D_INODE, "set inode %lu flags 0x%.8x\n", inode->i_ino,
70 I2SMI(inode)->smi_flags);
74 static void smfs_clear_inode_info(struct inode *inode)
76 struct inode *cache_inode = I2CI(inode);
77 struct smfs_inode_info * info = I2SMI(inode);
79 CDEBUG(D_INODE, "Clear_info: inode %lu (%p)\n", inode->i_ino, inode);
81 inode->u.generic_ip = NULL;
83 OBD_FREE(info, sizeof(*info));
86 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
87 static void smfs_read_inode2(struct inode *inode, void *opaque)
96 smfs_init_inode_info(inode, opaque);
97 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
98 inode->i_ino, atomic_read(&inode->i_count));
102 static int smfs_test_inode(struct inode *inode, unsigned long ino,
105 static int smfs_test_inode(struct inode *inode, void *opaque)
108 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
110 if (!sargs || (inode->i_ino != sargs->s_inode->i_ino))
114 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
115 !smfs_snap_test_inode(inode, opaque))
122 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
123 int smfs_set_inode(struct inode *inode, void *opaque)
125 struct smfs_iget_args *sargs = opaque;
127 inode->i_ino = sargs->s_inode->i_ino;
132 static struct inode *smfs_iget(struct super_block *sb, ino_t hash,
133 struct smfs_iget_args *sargs)
138 inode = iget5_locked(sb, hash, smfs_test_inode,
139 smfs_set_inode, sargs);
141 if (inode->i_state & I_NEW) {
142 smfs_init_inode_info(inode, (void*)sargs);
143 unlock_new_inode(inode);
146 CDEBUG(D_INODE, "inode: %lu/%u(%p) index %d\n",
147 inode->i_ino, inode->i_generation,
148 inode, sargs->s_index);
154 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
155 struct smfs_iget_args *sargs)
160 inode = iget4(sb, hash, smfs_test_inode, sargs);
162 struct inode *cache_inode = I2CI(inode);
164 CDEBUG(D_INODE, "new inode: %lu/%u(%p)\n", inode->i_ino,
165 inode->i_generation, inode);
171 struct inode *smfs_get_inode(struct super_block *sb, struct inode * cache_inode,
172 struct smfs_inode_info * dir_info, int index)
174 struct smfs_iget_args sargs;
178 sargs.s_inode = cache_inode;
179 sargs.s_info = dir_info;
180 sargs.s_index = index;
182 inode = smfs_iget(sb, cache_inode->i_ino, &sargs);
187 static int smfs_write_inode(struct inode *inode, int wait)
189 static void smfs_write_inode(struct inode *inode, int wait)
192 struct inode *cache_inode = I2CI(inode);
198 LASSERT(cache_inode);
200 CDEBUG(D_INODE,"Write inode %lu\n",inode->i_ino);
202 pre_smfs_inode(inode, cache_inode);
205 rc = cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
207 cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
209 post_smfs_inode(inode, cache_inode);
218 static void smfs_dirty_inode(struct inode *inode)
220 struct inode *cache_inode;
223 cache_inode = I2CI(inode);
224 LASSERT(cache_inode);
226 pre_smfs_inode(inode, cache_inode);
228 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
230 post_smfs_inode(inode, cache_inode);
234 static void smfs_delete_inode(struct inode *inode)
236 //struct inode * cache_inode = I2CI(inode);
238 //smfs_clear_inode_info(inode);
242 static void smfs_clear_inode(struct inode *inode)
244 smfs_clear_inode_info(inode);
247 static void smfs_write_super(struct super_block *sb)
253 S2CSB(sb)->s_op->write_super(S2CSB(sb));
254 duplicate_sb(sb, S2CSB(sb));
258 static void smfs_write_super_lockfs(struct super_block *sb)
260 struct super_block * cache_sb = S2CSB(sb);
265 cache_sb->s_op->write_super_lockfs(cache_sb);
266 duplicate_sb(sb, cache_sb);
270 static void smfs_unlockfs(struct super_block *sb)
272 struct super_block * cache_sb = S2CSB(sb);
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 = S2CSB(sb);
295 rc = cache_sb->s_op->statfs(cache_sb, buf);
296 duplicate_sb(sb, cache_sb);
301 static int smfs_remount(struct super_block *sb, int *flags, char *data)
303 struct super_block *cache_sb = S2CSB(sb);
309 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
310 duplicate_sb(sb, cache_sb);
315 struct super_operations smfs_super_ops = {
316 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
317 .read_inode2 = smfs_read_inode2,
319 .clear_inode = smfs_clear_inode,
320 .put_super = smfs_put_super,
321 .delete_inode = smfs_delete_inode,
322 .write_inode = smfs_write_inode,
323 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
324 .write_super = smfs_write_super, /* BKL held */
325 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
326 .unlockfs = smfs_unlockfs, /* BKL not held. */
327 .statfs = smfs_statfs, /* BKL held */
328 .remount_fs = smfs_remount, /* BKL held */