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)
42 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
43 struct inode *cache_inode = NULL;
46 cache_inode = iget(S2CSB(inode->i_sb), sargs->s_ino);
48 cache_inode = iget(S2CSB(inode->i_sb), inode->i_ino);
50 OBD_ALLOC(I2SMI(inode), sizeof(struct smfs_inode_info));
51 LASSERT(I2SMI(inode));
52 I2CI(inode) = cache_inode;
53 CDEBUG(D_INODE, "cache_inode i_count ino %lu i_count %d\n",
54 cache_inode->i_ino, atomic_read(&cache_inode->i_count));
55 post_smfs_inode(inode, cache_inode);
56 sm_set_inode_ops(cache_inode, inode);
58 struct inode *dir = sargs->s_inode;
60 I2SMI(inode)->smi_flags = I2SMI(dir)->smi_flags;
64 static void smfs_clear_inode_info(struct inode *inode)
67 struct inode *cache_inode = I2CI(inode);
68 LASSERTF(((atomic_read(&cache_inode->i_count) == 1) ||
69 cache_inode == cache_inode->i_sb->s_root->d_inode),
70 "inode %p cache inode %p %lu i_count %d != 0 \n",
71 inode, cache_inode, cache_inode->i_ino,
72 atomic_read(&cache_inode->i_count));
73 if (cache_inode != cache_inode->i_sb->s_root->d_inode)
75 OBD_FREE(I2SMI(inode), sizeof(struct smfs_inode_info));
80 static void smfs_read_inode2(struct inode *inode, void *opaque)
87 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
88 smfs_init_inode_info(inode, opaque);
89 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
90 inode->i_ino, atomic_read(&inode->i_count));
95 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
96 static int smfs_test_inode(struct inode *inode, unsigned long ino,
99 static int smfs_test_inode(struct inode *inode, void *opaque)
102 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
108 if (inode->i_ino != sargs->s_ino)
111 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
112 !smfs_snap_test_inode(inode, opaque))
116 struct inode *cache_inode = I2CI(inode);
118 LASSERTF(cache_inode->i_ino == inode->i_ino,
119 "inode ino %lu != cache ino %lu",
120 cache_inode->i_ino, inode->i_ino);
123 smfs_init_inode_info(inode, opaque);
127 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
128 int smfs_set_inode(struct inode *inode, void *opaque)
130 smfs_read_inode2(inode, opaque);
134 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
135 struct smfs_iget_args *sargs)
141 inode = iget5_locked(sb, hash, smfs_test_inode, smfs_set_inode, sargs);
143 if (inode->i_state & I_NEW)
144 unlock_new_inode(inode);
145 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p) index %d ino %lu \n",
146 inode->i_ino, inode->i_generation, inode, sargs->s_index,
153 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
154 struct smfs_iget_args *sargs)
159 inode = iget4(sb, hash, smfs_test_inode, sargs);
162 struct inode *cache_inode = I2CI(inode);
164 LASSERTF((inode->i_ino == cache_inode->i_ino),
165 "inode %p ino %lu != cache inode %p ino %lu",
166 inode, inode->i_ino, cache_inode, cache_inode->i_ino);
167 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
168 inode->i_generation, inode);
173 struct inode *smfs_get_inode (struct super_block *sb, ino_t hash,
174 struct inode *dir, int index)
177 struct smfs_iget_args sargs;
180 sargs.s_index = index;
183 inode = smfs_iget(sb, hash, &sargs);
188 static void smfs_delete_inode(struct inode *inode)
190 struct inode *cache_inode;
194 cache_inode = I2CI(inode);
195 if (!cache_inode || !S2CSB(inode->i_sb))
197 post_smfs_inode(inode, cache_inode);
198 smfs_clear_inode_info(inode);
200 inode->i_state = I_CLEAR;
204 static void smfs_write_inode(struct inode *inode, int wait)
206 struct inode *cache_inode;
209 cache_inode = I2CI(inode);
212 CWARN("cache inode null\n");
215 pre_smfs_inode(inode, cache_inode);
216 if (S2CSB(inode->i_sb)->s_op->write_inode)
217 S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
219 post_smfs_inode(inode, cache_inode);
223 static void smfs_dirty_inode(struct inode *inode)
225 struct inode *cache_inode;
228 cache_inode = I2CI(inode);
230 if (!cache_inode || !S2CSB(inode->i_sb))
233 pre_smfs_inode(inode, cache_inode);
234 if (S2CSB(inode->i_sb)->s_op->dirty_inode)
235 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
237 post_smfs_inode(inode, cache_inode);
241 static void smfs_put_inode(struct inode *inode)
243 struct inode *cache_inode;
246 cache_inode = I2CI(inode);
249 CWARN("cache inode null\n");
253 if (atomic_read(&cache_inode->i_count) > 1) {
257 if (S2CSB(inode->i_sb)->s_op->put_inode)
258 S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
260 if (atomic_read(&inode->i_count) == 0 &&
261 cache_inode->i_sb->s_root->d_inode != cache_inode)
262 smfs_clear_inode_info(inode);
267 static void smfs_write_super(struct super_block *sb)
274 if (S2CSB(sb)->s_op->write_super)
275 S2CSB(sb)->s_op->write_super(S2CSB(sb));
276 duplicate_sb(sb, S2CSB(sb));
281 static void smfs_clear_inode(struct inode *inode)
283 struct inode *cache_inode;
289 cache_inode = I2CI(inode);
291 smfs_clear_inode_info(inode);
297 static void smfs_write_super_lockfs(struct super_block *sb)
299 struct super_block *cache_sb;
302 cache_sb = S2CSB(sb);
306 if (cache_sb->s_op->write_super_lockfs)
307 cache_sb->s_op->write_super_lockfs(cache_sb);
309 duplicate_sb(sb, cache_sb);
313 static void smfs_unlockfs(struct super_block *sb)
315 struct super_block *cache_sb;
318 cache_sb = S2CSB(sb);
322 if (cache_sb->s_op->unlockfs)
323 cache_sb->s_op->unlockfs(cache_sb);
325 duplicate_sb(sb, cache_sb);
329 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
330 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
332 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
335 struct super_block *cache_sb;
339 cache_sb = S2CSB(sb);
343 if (cache_sb->s_op->statfs)
344 rc = cache_sb->s_op->statfs(cache_sb, buf);
346 duplicate_sb(sb, cache_sb);
350 static int smfs_remount(struct super_block *sb, int *flags, char *data)
352 struct super_block *cache_sb;
356 cache_sb = S2CSB(sb);
361 if (cache_sb->s_op->remount_fs)
362 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
364 duplicate_sb(sb, cache_sb);
367 struct super_operations smfs_super_ops = {
368 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
369 .read_inode2 = smfs_read_inode2,
371 .clear_inode = smfs_clear_inode,
372 .put_super = smfs_put_super,
373 .delete_inode = smfs_delete_inode,
374 .write_inode = smfs_write_inode,
375 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
376 .put_inode = smfs_put_inode, /* BKL not held. */
377 .write_super = smfs_write_super, /* BKL held */
378 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
379 .unlockfs = smfs_unlockfs, /* BKL not held. */
380 .statfs = smfs_statfs, /* BKL held */
381 .remount_fs = smfs_remount, /* BKL held */
384 int is_smfs_sb(struct super_block *sb)
386 return (sb->s_op->put_super == smfs_super_ops.put_super);
388 EXPORT_SYMBOL(is_smfs_sb);