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authorAl Viro <viro@zeniv.linux.org.uk>2008-12-30 01:48:21 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2008-12-31 18:07:43 -0500
commit261bca86ed4f7f391d1938167624e78da61dcc6b (patch)
tree4601cf090fbfec31fbd554a27c67c717a7caba4b /fs/inode.c
parent272eb01485dda98e3b8910c7c1a53d597616b0a0 (diff)
nfsd/create race fixes, infrastructure
new helpers - insert_inode_locked() and insert_inode_locked4(). Hash new inode, making sure that there's no such inode in icache already. If there is and it does not end up unhashed (as would happen if we have nfsd trying to resolve a bogus fhandle), fail. Otherwise insert our inode into hash and succeed. In either case have i_state set to new+locked; cleanup ends up being simpler with such calling conventions. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 098a2443196..7de1cda9248 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1032,6 +1032,65 @@ struct inode *iget_locked(struct super_block *sb, unsigned long ino)
EXPORT_SYMBOL(iget_locked);
+int insert_inode_locked(struct inode *inode)
+{
+ struct super_block *sb = inode->i_sb;
+ ino_t ino = inode->i_ino;
+ struct hlist_head *head = inode_hashtable + hash(sb, ino);
+ struct inode *old;
+
+ inode->i_state |= I_LOCK|I_NEW;
+ while (1) {
+ spin_lock(&inode_lock);
+ old = find_inode_fast(sb, head, ino);
+ if (likely(!old)) {
+ hlist_add_head(&inode->i_hash, head);
+ spin_unlock(&inode_lock);
+ return 0;
+ }
+ __iget(old);
+ spin_unlock(&inode_lock);
+ wait_on_inode(old);
+ if (unlikely(!hlist_unhashed(&old->i_hash))) {
+ iput(old);
+ return -EBUSY;
+ }
+ iput(old);
+ }
+}
+
+EXPORT_SYMBOL(insert_inode_locked);
+
+int insert_inode_locked4(struct inode *inode, unsigned long hashval,
+ int (*test)(struct inode *, void *), void *data)
+{
+ struct super_block *sb = inode->i_sb;
+ struct hlist_head *head = inode_hashtable + hash(sb, hashval);
+ struct inode *old;
+
+ inode->i_state |= I_LOCK|I_NEW;
+
+ while (1) {
+ spin_lock(&inode_lock);
+ old = find_inode(sb, head, test, data);
+ if (likely(!old)) {
+ hlist_add_head(&inode->i_hash, head);
+ spin_unlock(&inode_lock);
+ return 0;
+ }
+ __iget(old);
+ spin_unlock(&inode_lock);
+ wait_on_inode(old);
+ if (unlikely(!hlist_unhashed(&old->i_hash))) {
+ iput(old);
+ return -EBUSY;
+ }
+ iput(old);
+ }
+}
+
+EXPORT_SYMBOL(insert_inode_locked4);
+
/**
* __insert_inode_hash - hash an inode
* @inode: unhashed inode