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 LASSERTF((!I2SMI(inode)), "Inode %lu already has smfs_inode_info %p \n",
50 inode->i_ino, I2SMI(inode));
52 /* getting backing fs inode. */
55 cache_inode = iget(S2CSB(inode->i_sb), ino);
57 OBD_ALLOC(inode->u.generic_ip, sizeof(struct smfs_inode_info));
59 LASSERT(inode->u.generic_ip);
61 I2CI(inode) = cache_inode;
62 CDEBUG(D_INODE,"Init inode info #%lu (%p) icount %u\n", inode->i_ino, inode,
63 atomic_read(&cache_inode->i_count));
65 post_smfs_inode(inode, cache_inode);
66 sm_set_inode_ops(cache_inode, inode);
68 if (ino == SMFS_IOPEN_INO) {
69 inode->i_op = &smfs_iopen_iops;
70 inode->i_fop = &smfs_iopen_fops;
72 //inherit parent inode flags
74 I2SMI(inode)->smi_flags = I2SMI(sargs->s_inode)->smi_flags;
75 CDEBUG(D_INODE, "set inode %lu flags 0x%.8x\n", inode->i_ino,
76 I2SMI(inode)->smi_flags);
80 static void smfs_clear_inode_info(struct inode *inode)
82 struct inode *cache_inode = I2CI(inode);
83 struct smfs_inode_info * info = I2SMI(inode);
85 CDEBUG(D_INODE, "Clear_info: inode %lu (%p)\n", inode->i_ino, inode);
87 inode->u.generic_ip = NULL;
89 OBD_FREE(info, sizeof(*info));
92 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
93 static void smfs_read_inode2(struct inode *inode, void *opaque)
102 smfs_init_inode_info(inode, opaque);
103 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
104 inode->i_ino, atomic_read(&inode->i_count));
108 static int smfs_test_inode(struct inode *inode, unsigned long ino,
111 static int smfs_test_inode(struct inode *inode, void *opaque)
114 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
116 if (!sargs || (inode->i_ino != sargs->s_ino))
120 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
121 !smfs_snap_test_inode(inode, opaque))
128 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
129 int smfs_set_inode(struct inode *inode, void *opaque)
131 struct smfs_iget_args *sargs = opaque;
133 inode->i_ino = sargs->s_ino;
138 static struct inode *smfs_iget(struct super_block *sb, ino_t hash,
139 struct smfs_iget_args *sargs)
144 inode = iget5_locked(sb, hash, smfs_test_inode,
145 smfs_set_inode, sargs);
147 if (inode->i_state & I_NEW) {
148 smfs_init_inode_info(inode, (void*)sargs);
149 unlock_new_inode(inode);
152 CDEBUG(D_INODE, "inode: %lu/%u(%p) index %d "
153 "ino %d\n", inode->i_ino, inode->i_generation,
154 inode, sargs->s_index, sargs->s_ino);
160 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
161 struct smfs_iget_args *sargs)
166 inode = iget4(sb, hash, smfs_test_inode, sargs);
168 struct inode *cache_inode = I2CI(inode);
170 CDEBUG(D_INODE, "new inode: %lu/%u(%p)\n", inode->i_ino,
171 inode->i_generation, inode);
177 struct inode *smfs_get_inode(struct super_block *sb, ino_t hash,
178 struct inode *dir, int index)
180 struct smfs_iget_args sargs;
186 sargs.s_index = index;
188 inode = smfs_iget(sb, hash, &sargs);
193 static int smfs_write_inode(struct inode *inode, int wait)
195 static void smfs_write_inode(struct inode *inode, int wait)
198 struct inode *cache_inode = I2CI(inode);
204 LASSERT(cache_inode);
206 CDEBUG(D_INODE,"Write inode %lu\n",inode->i_ino);
208 pre_smfs_inode(inode, cache_inode);
211 rc = cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
213 cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
215 post_smfs_inode(inode, cache_inode);
224 static void smfs_dirty_inode(struct inode *inode)
226 struct inode *cache_inode;
229 cache_inode = I2CI(inode);
230 LASSERT(cache_inode);
232 pre_smfs_inode(inode, cache_inode);
234 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
236 post_smfs_inode(inode, cache_inode);
240 static void smfs_delete_inode(struct inode *inode)
242 struct inode * cache_inode = I2CI(inode);
244 //smfs_clear_inode_info(inode);
248 static void smfs_clear_inode(struct inode *inode)
250 smfs_clear_inode_info(inode);
253 static void smfs_write_super(struct super_block *sb)
259 S2CSB(sb)->s_op->write_super(S2CSB(sb));
260 duplicate_sb(sb, S2CSB(sb));
264 static void smfs_write_super_lockfs(struct super_block *sb)
266 struct super_block * cache_sb = S2CSB(sb);
271 cache_sb->s_op->write_super_lockfs(cache_sb);
272 duplicate_sb(sb, cache_sb);
276 static void smfs_unlockfs(struct super_block *sb)
278 struct super_block * cache_sb = S2CSB(sb);
283 cache_sb->s_op->unlockfs(cache_sb);
285 duplicate_sb(sb, cache_sb);
289 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
290 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
292 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
295 struct super_block *cache_sb = S2CSB(sb);
301 rc = cache_sb->s_op->statfs(cache_sb, buf);
302 duplicate_sb(sb, cache_sb);
307 static int smfs_remount(struct super_block *sb, int *flags, char *data)
309 struct super_block *cache_sb = S2CSB(sb);
315 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
316 duplicate_sb(sb, cache_sb);
321 struct super_operations smfs_super_ops = {
322 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
323 .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 .write_super = smfs_write_super, /* BKL held */
331 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
332 .unlockfs = smfs_unlockfs, /* BKL not held. */
333 .statfs = smfs_statfs, /* BKL held */
334 .remount_fs = smfs_remount, /* BKL held */