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));
51 /* getting backing fs inode. */
54 cache_inode = iget(S2CSB(inode->i_sb), ino);
56 OBD_ALLOC(inode->u.generic_ip,
57 sizeof(struct smfs_inode_info));
59 LASSERT(inode->u.generic_ip);
61 I2CI(inode) = cache_inode;
63 CDEBUG(D_INODE, "cache_inode %lu i_count %d\n",
64 cache_inode->i_ino, atomic_read(&cache_inode->i_count));
66 post_smfs_inode(inode, cache_inode);
67 sm_set_inode_ops(cache_inode, inode);
69 if (ino == SMFS_IOPEN_INO) {
70 inode->i_op = &smfs_iopen_iops;
71 inode->i_fop = &smfs_iopen_fops;
73 //inherit parent inode flags
75 I2SMI(inode)->smi_flags = I2SMI(sargs->s_inode)->smi_flags;
76 CDEBUG(D_INODE, "set inode %lu flags %d\n", inode->i_ino,
77 I2SMI(inode)->smi_flags);
81 static void smfs_clear_inode_info(struct inode *inode)
84 struct inode *cache_inode = I2CI(inode);
86 LASSERTF(I2SMI(inode), "Inode %lu smfs_inode_info\n",
89 CDEBUG(D_INODE, "Clear_info: inode %p\n", cache_inode);
91 LASSERTF(((atomic_read(&cache_inode->i_count) == 1) ||
92 cache_inode == cache_inode->i_sb->s_root->d_inode),
93 "inode %p cache inode %p #%lu i_count %d != 1 \n",
94 inode, cache_inode, cache_inode->i_ino,
95 atomic_read(&cache_inode->i_count));
99 OBD_FREE(inode->u.generic_ip, sizeof(struct smfs_inode_info));
100 inode->u.generic_ip = NULL;
103 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
104 static void smfs_read_inode2(struct inode *inode, void *opaque)
113 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
114 smfs_init_inode_info(inode, opaque);
115 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
116 inode->i_ino, atomic_read(&inode->i_count));
120 static int smfs_test_inode(struct inode *inode, unsigned long ino,
123 static int smfs_test_inode(struct inode *inode, void *opaque)
126 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
128 if (!sargs || (inode->i_ino != sargs->s_ino))
132 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
133 !smfs_snap_test_inode(inode, opaque))
140 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
141 int smfs_set_inode(struct inode *inode, void *opaque)
143 struct smfs_iget_args *sargs = opaque;
145 inode->i_ino = sargs->s_ino;
150 static struct inode *smfs_iget(struct super_block *sb, ino_t hash,
151 struct smfs_iget_args *sargs)
156 inode = iget5_locked(sb, hash, smfs_test_inode,
157 smfs_set_inode, sargs);
159 if (inode->i_state & I_NEW) {
160 smfs_init_inode_info(inode, (void*)sargs);
161 unlock_new_inode(inode);
164 CDEBUG(D_INODE, "inode: %lu/%u(%p) index %d "
165 "ino %d\n", inode->i_ino, inode->i_generation,
166 inode, sargs->s_index, sargs->s_ino);
172 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
173 struct smfs_iget_args *sargs)
178 inode = iget4(sb, hash, smfs_test_inode, sargs);
180 struct inode *cache_inode = I2CI(inode);
182 CDEBUG(D_INODE, "new inode: %lu/%u(%p)\n", inode->i_ino,
183 inode->i_generation, inode);
189 struct inode *smfs_get_inode(struct super_block *sb, ino_t hash,
190 struct inode *dir, int index)
192 struct smfs_iget_args sargs;
198 sargs.s_index = index;
200 inode = smfs_iget(sb, hash, &sargs);
205 static int smfs_write_inode(struct inode *inode, int wait)
207 static void smfs_write_inode(struct inode *inode, int wait)
210 struct inode *cache_inode = I2CI(inode);
216 LASSERT(cache_inode);
218 CDEBUG(D_INODE,"Write inode %lu\n",inode->i_ino);
220 pre_smfs_inode(inode, cache_inode);
223 rc = cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
225 cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
227 post_smfs_inode(inode, cache_inode);
236 static void smfs_dirty_inode(struct inode *inode)
238 struct inode *cache_inode;
241 cache_inode = I2CI(inode);
242 LASSERT(cache_inode);
244 pre_smfs_inode(inode, cache_inode);
246 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
248 post_smfs_inode(inode, cache_inode);
252 static void smfs_delete_inode(struct inode *inode)
259 static void smfs_clear_inode(struct inode *inode)
262 smfs_clear_inode_info(inode);
266 static void smfs_write_super(struct super_block *sb)
272 S2CSB(sb)->s_op->write_super(S2CSB(sb));
273 duplicate_sb(sb, S2CSB(sb));
277 static void smfs_write_super_lockfs(struct super_block *sb)
279 struct super_block * cache_sb = S2CSB(sb);
284 cache_sb->s_op->write_super_lockfs(cache_sb);
285 duplicate_sb(sb, cache_sb);
289 static void smfs_unlockfs(struct super_block *sb)
291 struct super_block * cache_sb = S2CSB(sb);
296 cache_sb->s_op->unlockfs(cache_sb);
298 duplicate_sb(sb, cache_sb);
302 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
303 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
305 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
308 struct super_block *cache_sb = S2CSB(sb);
314 rc = cache_sb->s_op->statfs(cache_sb, buf);
315 duplicate_sb(sb, cache_sb);
320 static int smfs_remount(struct super_block *sb, int *flags, char *data)
322 struct super_block *cache_sb = S2CSB(sb);
328 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
329 duplicate_sb(sb, cache_sb);
334 struct super_operations smfs_super_ops = {
335 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
336 .read_inode2 = smfs_read_inode2,
338 .clear_inode = smfs_clear_inode,
339 .put_super = smfs_put_super,
340 .delete_inode = smfs_delete_inode,
341 .write_inode = smfs_write_inode,
342 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
343 .write_super = smfs_write_super, /* BKL held */
344 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
345 .unlockfs = smfs_unlockfs, /* BKL not held. */
346 .statfs = smfs_statfs, /* BKL held */
347 .remount_fs = smfs_remount, /* BKL held */