6 #define DEBUG_SUBSYSTEM S_SM
8 #include <linux/kmod.h>
9 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/string.h>
13 #include "smfs_internal.h"
15 void duplicate_inode(struct inode *cache_inode, struct inode *inode)
18 inode->i_mode = cache_inode->i_mode;
19 inode->i_uid = cache_inode->i_uid;
20 inode->i_gid = cache_inode->i_gid;
22 inode->i_nlink = cache_inode->i_nlink;
23 inode->i_size = cache_inode->i_size;
24 inode->i_atime = cache_inode->i_atime;
25 inode->i_ctime = cache_inode->i_ctime;
26 inode->i_mtime = cache_inode->i_mtime;
27 inode->i_blksize = cache_inode->i_blksize; /* This is the optimal IO size
28 * (for stat), not the fs block
30 inode->i_blocks = cache_inode->i_blocks;
31 inode->i_version = cache_inode->i_version;
32 inode->i_state = cache_inode->i_state;
34 static void smfs_read_inode(struct inode *inode)
36 struct super_block *cache_sb;
37 struct inode *cache_inode;
43 CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
44 cache_sb = S2CSB(inode->i_sb);
46 cache_inode = iget(cache_sb, inode->i_ino);
47 I2CI(inode) = cache_inode;
49 if(cache_sb && cache_sb->s_op->read_inode)
50 cache_sb->s_op->read_inode(cache_inode);
52 duplicate_inode(cache_inode, inode);
53 sm_set_inode_ops(cache_inode, inode);
55 CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
56 inode->i_ino, atomic_read(&inode->i_count));
61 /* Although some filesystem(such as ext3) do not have
62 * clear_inode method, but we need it to free the
65 static void smfs_clear_inode(struct inode *inode)
67 struct super_block *cache_sb;
68 struct inode *cache_inode;
74 cache_sb = S2CSB(inode->i_sb);
75 cache_inode = I2CI(inode);
80 static void smfs_delete_inode(struct inode *inode)
82 struct inode *cache_inode;
83 struct super_block *cache_sb;
86 cache_inode = I2CI(inode);
87 cache_sb = S2CSB(inode->i_sb);
89 if (!cache_inode || !cache_sb)
92 /*FIXME: because i_count of cache_inode may not
93 * be 0 or 1 in before smfs_delete inode, So we
94 * need to dec it to 1 before we call delete_inode
95 * of the bellow cache filesystem Check again latter*/
97 if (atomic_read(&cache_inode->i_count) < 1)
100 while (atomic_read(&cache_inode->i_count) != 1) {
101 atomic_dec(&cache_inode->i_count);
104 duplicate_inode(inode, cache_inode);
106 list_del(&cache_inode->i_hash);
107 INIT_LIST_HEAD(&cache_inode->i_hash);
108 list_del(&cache_inode->i_list);
109 INIT_LIST_HEAD(&cache_inode->i_list);
111 if (cache_inode->i_data.nrpages)
112 truncate_inode_pages(&cache_inode->i_data, 0);
114 if (cache_sb->s_op->delete_inode)
115 cache_sb->s_op->delete_inode(cache_inode);
117 duplicate_inode(cache_inode, inode);
121 static void smfs_write_inode(struct inode *inode, int wait)
123 struct inode *cache_inode;
124 struct super_block *cache_sb;
127 cache_inode = I2CI(inode);
128 cache_sb = S2CSB(inode->i_sb);
130 if (!cache_inode || !cache_sb)
133 if (cache_sb->s_op->write_inode)
134 cache_sb->s_op->write_inode(cache_inode, wait);
136 duplicate_inode(cache_inode, inode);
140 static void smfs_dirty_inode(struct inode *inode)
142 struct inode *cache_inode;
143 struct super_block *cache_sb;
146 cache_inode = I2CI(inode);
147 cache_sb = S2CSB(inode->i_sb);
149 if (!cache_inode || !cache_sb)
152 if (cache_sb->s_op->dirty_inode)
153 cache_sb->s_op->dirty_inode(cache_inode);
155 duplicate_inode(cache_inode, inode);
159 static void smfs_put_inode(struct inode *inode)
161 struct inode *cache_inode;
162 struct super_block *cache_sb;
165 cache_inode = I2CI(inode);
166 cache_sb = S2CSB(inode->i_sb);
168 if (!cache_inode || !cache_sb)
170 if (cache_sb->s_op->put_inode)
171 cache_sb->s_op->put_inode(cache_inode);
176 static void smfs_write_super(struct super_block *sb)
178 struct super_block *cache_sb;
181 cache_sb = S2CSB(sb);
186 if (cache_sb->s_op->write_super)
187 cache_sb->s_op->write_super(cache_sb);
189 duplicate_sb(cache_sb, sb);
193 static void smfs_write_super_lockfs(struct super_block *sb)
195 struct super_block *cache_sb;
198 cache_sb = S2CSB(sb);
203 if (cache_sb->s_op->write_super_lockfs)
204 cache_sb->s_op->write_super_lockfs(cache_sb);
206 duplicate_sb(cache_sb, sb);
210 static void smfs_unlockfs(struct super_block *sb)
212 struct super_block *cache_sb;
215 cache_sb = S2CSB(sb);
220 if (cache_sb->s_op->unlockfs)
221 cache_sb->s_op->unlockfs(cache_sb);
223 duplicate_sb(cache_sb, sb);
226 static int smfs_statfs(struct super_block * sb, struct statfs * buf)
228 struct super_block *cache_sb;
232 cache_sb = S2CSB(sb);
237 if (cache_sb->s_op->statfs)
238 rc = cache_sb->s_op->statfs(cache_sb, buf);
240 duplicate_sb(cache_sb, sb);
244 static int smfs_remount(struct super_block * sb, int * flags, char * data)
246 struct super_block *cache_sb;
250 cache_sb = S2CSB(sb);
255 if (cache_sb->s_op->remount_fs)
256 rc = cache_sb->s_op->remount_fs(cache_sb, flags, data);
258 duplicate_sb(cache_sb, sb);
261 struct super_operations smfs_super_ops = {
262 read_inode: smfs_read_inode,
263 clear_inode: smfs_clear_inode,
264 put_super: smfs_put_super,
265 delete_inode: smfs_delete_inode,
266 write_inode: smfs_write_inode,
267 dirty_inode: smfs_dirty_inode, /* BKL not held. We take it */
268 put_inode: smfs_put_inode, /* BKL not held. Don't need */
270 write_super: smfs_write_super, /* BKL held */
271 write_super_lockfs: smfs_write_super_lockfs, /* BKL not held. Take it */
272 unlockfs: smfs_unlockfs, /* BKL not held. We take it */
273 statfs: smfs_statfs, /* BKL held */
274 remount_fs: smfs_remount, /* BKL held */