aboutsummaryrefslogtreecommitdiff
path: root/fs/inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c67
1 files changed, 46 insertions, 21 deletions
diff --git a/fs/inode.c b/fs/inode.c
index e7ee99907d6..fbcf6c5e760 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -550,6 +550,49 @@ repeat:
return node ? inode : NULL;
}
+static unsigned long hash(struct super_block *sb, unsigned long hashval)
+{
+ unsigned long tmp;
+
+ tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
+ L1_CACHE_BYTES;
+ tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS);
+ return tmp & I_HASHMASK;
+}
+
+static inline void
+__inode_add_to_lists(struct super_block *sb, struct hlist_head *head,
+ struct inode *inode)
+{
+ inodes_stat.nr_inodes++;
+ list_add(&inode->i_list, &inode_in_use);
+ list_add(&inode->i_sb_list, &sb->s_inodes);
+ if (head)
+ hlist_add_head(&inode->i_hash, head);
+}
+
+/**
+ * inode_add_to_lists - add a new inode to relevant lists
+ * @sb - superblock inode belongs to.
+ * @inode - inode to mark in use
+ *
+ * When an inode is allocated it needs to be accounted for, added to the in use
+ * list, the owning superblock and the inode hash. This needs to be done under
+ * the inode_lock, so export a function to do this rather than the inode lock
+ * itself. We calculate the hash list to add to here so it is all internal
+ * which requires the caller to have already set up the inode number in the
+ * inode to add.
+ */
+void inode_add_to_lists(struct super_block *sb, struct inode *inode)
+{
+ struct hlist_head *head = inode_hashtable + hash(sb, inode->i_ino);
+
+ spin_lock(&inode_lock);
+ __inode_add_to_lists(sb, head, inode);
+ spin_unlock(&inode_lock);
+}
+EXPORT_SYMBOL_GPL(inode_add_to_lists);
+
/**
* new_inode - obtain an inode
* @sb: superblock
@@ -577,9 +620,7 @@ struct inode *new_inode(struct super_block *sb)
inode = alloc_inode(sb);
if (inode) {
spin_lock(&inode_lock);
- inodes_stat.nr_inodes++;
- list_add(&inode->i_list, &inode_in_use);
- list_add(&inode->i_sb_list, &sb->s_inodes);
+ __inode_add_to_lists(sb, NULL, inode);
inode->i_ino = ++last_ino;
inode->i_state = 0;
spin_unlock(&inode_lock);
@@ -638,10 +679,7 @@ static struct inode * get_new_inode(struct super_block *sb, struct hlist_head *h
if (set(inode, data))
goto set_failed;
- inodes_stat.nr_inodes++;
- list_add(&inode->i_list, &inode_in_use);
- list_add(&inode->i_sb_list, &sb->s_inodes);
- hlist_add_head(&inode->i_hash, head);
+ __inode_add_to_lists(sb, head, inode);
inode->i_state = I_LOCK|I_NEW;
spin_unlock(&inode_lock);
@@ -687,10 +725,7 @@ static struct inode * get_new_inode_fast(struct super_block *sb, struct hlist_he
old = find_inode_fast(sb, head, ino);
if (!old) {
inode->i_ino = ino;
- inodes_stat.nr_inodes++;
- list_add(&inode->i_list, &inode_in_use);
- list_add(&inode->i_sb_list, &sb->s_inodes);
- hlist_add_head(&inode->i_hash, head);
+ __inode_add_to_lists(sb, head, inode);
inode->i_state = I_LOCK|I_NEW;
spin_unlock(&inode_lock);
@@ -714,16 +749,6 @@ static struct inode * get_new_inode_fast(struct super_block *sb, struct hlist_he
return inode;
}
-static unsigned long hash(struct super_block *sb, unsigned long hashval)
-{
- unsigned long tmp;
-
- tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
- L1_CACHE_BYTES;
- tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS);
- return tmp & I_HASHMASK;
-}
-
/**
* iunique - get a unique inode number
* @sb: superblock