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)
43 struct inode *cache_inode = NULL;
44 struct smfs_iget_args *sargs;
47 sargs = (struct smfs_iget_args *)opaque;
49 /* getting backing fs inode. */
50 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);
58 I2CI(inode) = cache_inode;
60 CDEBUG(D_INODE, "cache_inode %lu i_count %d\n",
61 cache_inode->i_ino, atomic_read(&cache_inode->i_count));
63 post_smfs_inode(inode, cache_inode);
64 sm_set_inode_ops(cache_inode, inode);
67 struct inode *dir = sargs->s_inode;
69 I2SMI(inode)->smi_flags = I2SMI(dir)->smi_flags;
74 static void smfs_clear_inode_info(struct inode *inode)
77 struct inode *cache_inode = I2CI(inode);
79 CDEBUG(D_INODE, "Clear_info: cache_inode %lu\n", cache_inode->i_ino);
81 LASSERTF(((atomic_read(&cache_inode->i_count) == 1) ||
82 cache_inode == cache_inode->i_sb->s_root->d_inode),
83 "inode %p cache inode %p #%lu i_count %d != 1 \n",
84 inode, cache_inode, cache_inode->i_ino,
85 atomic_read(&cache_inode->i_count));
87 //if (cache_inode != cache_inode->i_sb->s_root->d_inode)
90 OBD_FREE(inode->u.generic_ip,
91 sizeof(struct smfs_inode_info));
92 inode->u.generic_ip = NULL;
96 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
97 static void smfs_read_inode2(struct inode *inode, void *opaque)
106 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
107 smfs_init_inode_info(inode, opaque);
108 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
109 inode->i_ino, atomic_read(&inode->i_count));
113 static int smfs_test_inode(struct inode *inode, unsigned long ino,
116 static int smfs_test_inode(struct inode *inode, void *opaque)
119 struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
121 if (!sargs || (inode->i_ino != sargs->s_ino))
125 if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
126 !smfs_snap_test_inode(inode, opaque))
133 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
134 int smfs_set_inode(struct inode *inode, void *opaque)
136 //smfs_read_inode2(inode, opaque);
140 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
141 struct smfs_iget_args *sargs)
146 inode = iget5_locked(sb, hash, smfs_test_inode,
147 smfs_set_inode, sargs);
149 if (inode->i_state & I_NEW) {
150 smfs_init_inode_info(inode, (void*)sargs);
151 unlock_new_inode(inode);
154 CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p) index %d "
155 "ino %d\n", inode->i_ino, inode->i_generation,
156 inode, sargs->s_index, sargs->s_ino);
162 struct inode *smfs_iget(struct super_block *sb, ino_t hash,
163 struct smfs_iget_args *sargs)
168 inode = iget4(sb, hash, smfs_test_inode, sargs);
170 struct inode *cache_inode = I2CI(inode);
172 CDEBUG(D_VFSTRACE, "new inode: %lu/%u(%p)\n", inode->i_ino,
173 inode->i_generation, inode);
179 struct inode *smfs_get_inode(struct super_block *sb, ino_t hash,
180 struct inode *dir, int index)
182 struct smfs_iget_args sargs;
188 sargs.s_index = index;
189 CDEBUG(D_VFSTRACE, "get_inode: %lu\n", hash);
191 inode = smfs_iget(sb, hash, &sargs);
196 static void smfs_delete_inode(struct inode *inode)
203 static void smfs_write_inode(struct inode *inode, int wait)
205 struct inode *cache_inode;
208 cache_inode = I2CI(inode);
209 LASSERT(cache_inode != NULL);
211 CDEBUG(D_INODE,"Write inode %lu\n",inode->i_ino);
213 pre_smfs_inode(inode, cache_inode);
215 if (cache_inode->i_sb->s_op->write_inode)
216 cache_inode->i_sb->s_op->write_inode(cache_inode, wait);
218 post_smfs_inode(inode, cache_inode);
222 static void smfs_dirty_inode(struct inode *inode)
224 struct inode *cache_inode;
227 cache_inode = I2CI(inode);
228 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);
240 static void smfs_put_inode(struct inode *inode)
243 struct inode *cache_inode;
246 cache_inode = I2CI(inode);
247 LASSERT(cache_inode != NULL);
249 if (atomic_read(&cache_inode->i_count) > 1)
253 * check if we have to release backend inode. As iput() calls fs
254 * specific ->put_inode() first and than decrements inode rerfcount, we
255 * should check here ->i_count for 1, not for 0.
257 * In principle we could rely on ->clear_inode(), but it will be called
258 * later, and thus we will have iputing of @inode and @cache_inode in
259 * different control paths, this is why we do it here. --umka
261 if (atomic_read(&inode->i_count) == 1 &&
262 cache_inode->i_sb->s_root->d_inode != cache_inode)
263 smfs_clear_inode_info(inode);
269 static void smfs_clear_inode(struct inode *inode)
272 smfs_clear_inode_info(inode);
276 static void smfs_write_super(struct super_block *sb)
285 if (S2CSB(sb)->s_op->write_super)
286 S2CSB(sb)->s_op->write_super(S2CSB(sb));
287 duplicate_sb(sb, S2CSB(sb));
291 static void smfs_write_super_lockfs(struct super_block *sb)
293 struct super_block *cache_sb;
296 cache_sb = S2CSB(sb);
302 if (cache_sb->s_op->write_super_lockfs)
303 cache_sb->s_op->write_super_lockfs(cache_sb);
305 duplicate_sb(sb, cache_sb);
309 static void smfs_unlockfs(struct super_block *sb)
311 struct super_block *cache_sb;
314 cache_sb = S2CSB(sb);
320 if (cache_sb->s_op->unlockfs)
321 cache_sb->s_op->unlockfs(cache_sb);
323 duplicate_sb(sb, cache_sb);
327 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
328 static int smfs_statfs(struct super_block *sb, struct statfs *buf)
330 static int smfs_statfs(struct super_block *sb, struct kstatfs *buf)
333 struct super_block *cache_sb;
337 cache_sb = S2CSB(sb);
341 if (cache_sb->s_op->statfs)
342 rc = cache_sb->s_op->statfs(cache_sb, buf);
344 duplicate_sb(sb, cache_sb);
347 static int smfs_remount(struct super_block *sb, int *flags, char *data)
349 struct super_block *cache_sb;
353 cache_sb = S2CSB(sb);
358 if (cache_sb->s_op->remount_fs)
359 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
361 duplicate_sb(sb, cache_sb);
365 struct super_operations smfs_super_ops = {
366 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
367 .read_inode2 = smfs_read_inode2,
369 .clear_inode = smfs_clear_inode,
370 .put_super = smfs_put_super,
371 .delete_inode = smfs_delete_inode,
372 .write_inode = smfs_write_inode,
373 .dirty_inode = smfs_dirty_inode, /* BKL not held. */
374 .put_inode = smfs_put_inode, /* BKL not held. */
375 .write_super = smfs_write_super, /* BKL held */
376 .write_super_lockfs = smfs_write_super_lockfs, /* BKL not held. */
377 .unlockfs = smfs_unlockfs, /* BKL not held. */
378 .statfs = smfs_statfs, /* BKL held */
379 .remount_fs = smfs_remount, /* BKL held */
382 int is_smfs_sb(struct super_block *sb)
384 return (sb->s_op->put_super == smfs_super_ops.put_super);
386 EXPORT_SYMBOL(is_smfs_sb);