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)
66 struct inode *cache_inode = I2CI(inode);
68 LASSERTF(atomic_read(&cache_inode->i_count) == 1,
69 "cache inode %lu i_count %d not 0\n", cache_inode->i_ino,
70 atomic_read(&cache_inode->i_count));
72 OBD_FREE(I2SMI(inode), sizeof(struct smfs_inode_info));
75 static void smfs_read_inode2(struct inode *inode, void *opaque)
82 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
83 smfs_init_inode_info(inode, opaque);
84 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
85 inode->i_ino, atomic_read(&inode->i_count));
90 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
91 static int smfs_test_inode(struct inode *inode, unsigned long ino,
94 static int smfs_test_inode(struct inode *inode, void *opaque)
97 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
102 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
103 if (inode->i_ino != sargs->s_ino)
107 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
108 !smfs_snap_test_inode(inode, opaque))
114 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
115 int smfs_set_inode(struct inode *inode, void *opaque)
117 smfs_read_inode2(inode, opaque);
121 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
122 struct smfs_iget_args *sargs)
128 inode = iget5_locked(sb, hash, smfs_test_inode, smfs_set_inode, sargs);
130 if (inode->i_state & I_NEW)
131 unlock_new_inode(inode);
132 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
133 inode->i_generation, inode);
139 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
140 struct smfs_iget_args *sargs)
145 inode = iget4(sb, hash, smfs_test_inode, sargs);
148 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
149 inode->i_generation, inode);
153 struct inode *smfs_get_inode (struct super_block *sb, ino_t hash,
154 struct inode *dir, int index)
157 struct smfs_iget_args sargs;
160 sargs.s_index = index;
163 inode = smfs_iget(sb, hash, &sargs);
168 static void smfs_delete_inode(struct inode *inode)
170 struct inode *cache_inode;
173 cache_inode = I2CI(inode);
175 if (!cache_inode || !S2CSB(inode->i_sb))
178 /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
179 * before smfs_delete inode, So we need to dec it to 1 before we call
180 * delete_inode of the bellow cache filesystem Check again latter. */
182 if (atomic_read(&cache_inode->i_count) < 1)
185 while (atomic_read(&cache_inode->i_count) != 1)
186 atomic_dec(&cache_inode->i_count);
188 pre_smfs_inode(inode, cache_inode);
190 if (atomic_read(&cache_inode->i_count) < 1)
193 while (atomic_read(&cache_inode->i_count) != 1) {
194 atomic_dec(&cache_inode->i_count);
197 pre_smfs_inode(inode, cache_inode);
199 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
200 list_del(&cache_inode->i_hash);
201 INIT_LIST_HEAD(&cache_inode->i_hash);
203 hlist_del_init(&cache_inode->i_hash);
205 list_del(&cache_inode->i_list);
206 INIT_LIST_HEAD(&cache_inode->i_list);
208 if (cache_inode->i_data.nrpages)
209 truncate_inode_pages(&cache_inode->i_data, 0);
211 if (S2CSB(inode->i_sb)->s_op->delete_inode)
212 S2CSB(inode->i_sb)->s_op->delete_inode(cache_inode);
214 post_smfs_inode(inode, cache_inode);
220 static void smfs_write_inode(struct inode *inode, int wait)
222 struct inode *cache_inode;
225 cache_inode = I2CI(inode);
228 CWARN("cache inode null\n");
231 pre_smfs_inode(inode, cache_inode);
232 if (S2CSB(inode->i_sb)->s_op->write_inode)
233 S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
235 post_smfs_inode(inode, cache_inode);
239 static void smfs_dirty_inode(struct inode *inode)
241 struct inode *cache_inode;
244 cache_inode = I2CI(inode);
246 if (!cache_inode || !S2CSB(inode->i_sb))
249 pre_smfs_inode(inode, cache_inode);
250 if (S2CSB(inode->i_sb)->s_op->dirty_inode)
251 S2CSB(inode->i_sb)->s_op->dirty_inode(cache_inode);
253 post_smfs_inode(inode, cache_inode);
257 static void smfs_put_inode(struct inode *inode)
259 struct inode *cache_inode;
262 cache_inode = I2CI(inode);
265 CWARN("cache inode null\n");
269 CDEBUG(D_INFO, "cache_inode i_count ino %lu i_count %d\n",
270 inode->i_ino, atomic_read(&inode->i_count));
271 if (atomic_read(&cache_inode->i_count) > 1 &&
272 cache_inode != cache_inode->i_sb->s_root->d_inode) {
273 CDEBUG(D_INFO, "cache_inode i_count ino %lu i_count %d\n",
275 atomic_read(&cache_inode->i_count) - 1);
279 if (S2CSB(inode->i_sb)->s_op->put_inode)
280 S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
285 static void smfs_write_super(struct super_block *sb)
292 if (S2CSB(sb)->s_op->write_super)
293 S2CSB(sb)->s_op->write_super(S2CSB(sb));
294 duplicate_sb(sb, S2CSB(sb));
299 static void smfs_clear_inode(struct inode *inode)
301 struct inode *cache_inode;
307 cache_inode = I2CI(inode);
309 if (cache_inode != cache_inode->i_sb->s_root->d_inode)
310 smfs_clear_inode_info(inode);
315 static void smfs_write_super_lockfs(struct super_block *sb)
317 struct super_block *cache_sb;
320 cache_sb = S2CSB(sb);
324 if (cache_sb->s_op->write_super_lockfs)
325 cache_sb->s_op->write_super_lockfs(cache_sb);
327 duplicate_sb(sb, cache_sb);
331 static void smfs_unlockfs(struct super_block *sb)
333 struct super_block *cache_sb;
336 cache_sb = S2CSB(sb);
340 if (cache_sb->s_op->unlockfs)
341 cache_sb->s_op->unlockfs(cache_sb);
343 duplicate_sb(sb, cache_sb);
347 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
348 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
350 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
353 struct super_block *cache_sb;
357 cache_sb = S2CSB(sb);
361 if (cache_sb->s_op->statfs)
362 rc = cache_sb->s_op->statfs(cache_sb, buf);
364 duplicate_sb(sb, cache_sb);
368 static int smfs_remount(struct super_block *sb, int *flags, char *data)
370 struct super_block *cache_sb;
374 cache_sb = S2CSB(sb);
379 if (cache_sb->s_op->remount_fs)
380 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
382 duplicate_sb(sb, cache_sb);
385 struct super_operations smfs_super_ops = {
386 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
387 .read_inode2 = smfs_read_inode2,
389 .clear_inode = smfs_clear_inode,
390 .put_super = smfs_put_super,
391 .delete_inode = smfs_delete_inode,
392 .write_inode = smfs_write_inode,
393 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
394 .put_inode = smfs_put_inode, /* BKL not held. */
395 .write_super = smfs_write_super, /* BKL held */
396 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
397 .unlockfs = smfs_unlockfs, /* BKL not held. */
398 .statfs = smfs_statfs, /* BKL held */
399 .remount_fs = smfs_remount, /* BKL held */
402 int is_smfs_sb(struct super_block *sb)
404 return (sb->s_op->put_super == smfs_super_ops.put_super);
406 EXPORT_SYMBOL(is_smfs_sb);