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 #define SMFS_IOPEN_INO 1
42 static void smfs_init_inode_info(struct inode *inode, void *opaque)
45 struct inode *cache_inode = NULL;
46 struct smfs_iget_args *sargs = opaque;
49 /* getting backing fs inode. */
51 ino = sargs ? sargs->s_ino : inode->i_ino;
52 cache_inode = iget(S2CSB(inode->i_sb), ino);
54 OBD_ALLOC(inode->u.generic_ip,
55 sizeof(struct smfs_inode_info));
57 LASSERT(inode->u.generic_ip);
59 I2CI(inode) = cache_inode;
61 CDEBUG(D_INODE, "cache_inode %lu i_count %d\n",
62 cache_inode->i_ino, atomic_read(&cache_inode->i_count));
64 post_smfs_inode(inode, cache_inode);
65 sm_set_inode_ops(cache_inode, inode);
67 if (ino == SMFS_IOPEN_INO) {
68 inode->i_op = &smfs_iopen_iops;
69 inode->i_fop = &smfs_iopen_fops;
72 struct inode *dir = sargs->s_inode;
74 I2SMI(inode)->smi_flags = I2SMI(dir)->smi_flags;
80 static void smfs_clear_inode_info(struct inode *inode)
83 struct inode *cache_inode = I2CI(inode);
85 CDEBUG(D_INODE, "Clear_info: inode %p\n",
88 LASSERTF(((atomic_read(&cache_inode->i_count) == 1) ||
89 cache_inode == cache_inode->i_sb->s_root->d_inode),
90 "inode %p cache inode %p #%lu i_count %d != 1 \n",
91 inode, cache_inode, cache_inode->i_ino,
92 atomic_read(&cache_inode->i_count));
96 OBD_FREE(inode->u.generic_ip, sizeof(struct smfs_inode_info));
97 inode->u.generic_ip = NULL;
102 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
103 static void smfs_read_inode2(struct inode *inode, void *opaque)
112 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
113 smfs_init_inode_info(inode, opaque);
114 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
115 inode->i_ino, atomic_read(&inode->i_count));
119 static int smfs_test_inode(struct inode *inode, unsigned long ino,
122 static int smfs_test_inode(struct inode *inode, void *opaque)
125 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
127 if (!sargs || (inode->i_ino != sargs->s_ino))
131 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
132 !smfs_snap_test_inode(inode, opaque))
139 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
140 int smfs_set_inode(struct inode *inode, void *opaque)
145 static struct inode *smfs_iget(struct super_block *sb, ino_t hash,
146 struct smfs_iget_args *sargs)
151 inode = iget5_locked(sb, hash, smfs_test_inode,
152 smfs_set_inode, sargs);
154 if (inode->i_state & I_NEW) {
155 smfs_init_inode_info(inode, (void*)sargs);
156 unlock_new_inode(inode);
158 //inode->i_ino = hash;
159 CDEBUG(D_INODE, "inode: %lu/%u(%p) index %d "
160 "ino %d\n", inode->i_ino, inode->i_generation,
161 inode, sargs->s_index, sargs->s_ino);
167 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
168 struct smfs_iget_args *sargs)
173 inode = iget4(sb, hash, smfs_test_inode, sargs);
175 struct inode *cache_inode = I2CI(inode);
177 CDEBUG(D_INODE, "new inode: %lu/%u(%p)\n", inode->i_ino,
178 inode->i_generation, inode);
184 struct inode *smfs_get_inode(struct super_block *sb, ino_t hash,
185 struct inode *dir, int index)
187 struct smfs_iget_args sargs;
193 sargs.s_index = index;
195 inode = smfs_iget(sb, hash, &sargs);
200 static int smfs_write_inode(struct inode *inode, int wait)
202 static void smfs_write_inode(struct inode *inode, int wait)
205 struct inode *cache_inode = I2CI(inode);
211 LASSERT(cache_inode);
213 CDEBUG(D_INODE,"Write inode %lu\n",inode->i_ino);
215 pre_smfs_inode(inode, cache_inode);
218 rc = cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
220 cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
222 post_smfs_inode(inode, cache_inode);
231 static void smfs_dirty_inode(struct inode *inode)
233 struct inode *cache_inode;
236 cache_inode = I2CI(inode);
237 LASSERT(cache_inode);
239 pre_smfs_inode(inode, cache_inode);
241 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
243 post_smfs_inode(inode, cache_inode);
247 static void smfs_delete_inode(struct inode *inode)
254 static void smfs_clear_inode(struct inode *inode)
257 smfs_clear_inode_info(inode);
261 static void smfs_write_super(struct super_block *sb)
267 S2CSB(sb)->s_op->write_super(S2CSB(sb));
268 duplicate_sb(sb, S2CSB(sb));
272 static void smfs_write_super_lockfs(struct super_block *sb)
274 struct super_block * cache_sb = S2CSB(sb);
279 cache_sb->s_op->write_super_lockfs(cache_sb);
280 duplicate_sb(sb, cache_sb);
284 static void smfs_unlockfs(struct super_block *sb)
286 struct super_block * cache_sb = S2CSB(sb);
291 cache_sb->s_op->unlockfs(cache_sb);
293 duplicate_sb(sb, cache_sb);
297 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
298 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
300 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
303 struct super_block *cache_sb = S2CSB(sb);
309 rc = cache_sb->s_op->statfs(cache_sb, buf);
310 duplicate_sb(sb, cache_sb);
315 static int smfs_remount(struct super_block *sb, int *flags, char *data)
317 struct super_block *cache_sb = S2CSB(sb);
323 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
324 duplicate_sb(sb, cache_sb);
329 struct super_operations smfs_super_ops = {
330 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
331 .read_inode2 = smfs_read_inode2,
333 .clear_inode = smfs_clear_inode,
334 .put_super = smfs_put_super,
335 .delete_inode = smfs_delete_inode,
336 .write_inode = smfs_write_inode,
337 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
338 .write_super = smfs_write_super, /* BKL held */
339 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
340 .unlockfs = smfs_unlockfs, /* BKL not held. */
341 .statfs = smfs_statfs, /* BKL held */
342 .remount_fs = smfs_remount, /* BKL held */