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authorAl Viro <viro@zeniv.linux.org.uk>2018-04-25 16:52:25 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2018-05-13 18:08:32 +0200
commit61fec493c9df7958f8417e1e2f6530a614ee619a (patch)
treec8df5c66a14064533dbd4081d81a25e36d1fb790 /fs/dcache.c
parentit's SB_BORN, not MS_BORN... (diff)
downloadlinux-61fec493c9df7958f8417e1e2f6530a614ee619a.tar.xz
linux-61fec493c9df7958f8417e1e2f6530a614ee619a.zip
get rid of dead code in d_find_alias()
All "try disconnected alias if nothing else fits" logics in d_find_alias() got accidentally disabled by Neil a while ago; for most of the callers it was the right thing to do, so fixes belong in few callers that *do* want disconnected aliases. This just takes the now-dead code in d_find_alias() out. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c83
1 files changed, 34 insertions, 49 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 86d2de63461e..e9476e94372a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -907,6 +907,35 @@ repeat:
}
EXPORT_SYMBOL(dget_parent);
+static struct dentry * __d_find_any_alias(struct inode *inode)
+{
+ struct dentry *alias;
+
+ if (hlist_empty(&inode->i_dentry))
+ return NULL;
+ alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
+ __dget(alias);
+ return alias;
+}
+
+/**
+ * d_find_any_alias - find any alias for a given inode
+ * @inode: inode to find an alias for
+ *
+ * If any aliases exist for the given inode, take and return a
+ * reference for one of them. If no aliases exist, return %NULL.
+ */
+struct dentry *d_find_any_alias(struct inode *inode)
+{
+ struct dentry *de;
+
+ spin_lock(&inode->i_lock);
+ de = __d_find_any_alias(inode);
+ spin_unlock(&inode->i_lock);
+ return de;
+}
+EXPORT_SYMBOL(d_find_any_alias);
+
/**
* d_find_alias - grab a hashed alias of inode
* @inode: inode in question
@@ -923,34 +952,19 @@ EXPORT_SYMBOL(dget_parent);
*/
static struct dentry *__d_find_alias(struct inode *inode)
{
- struct dentry *alias, *discon_alias;
+ struct dentry *alias;
+
+ if (S_ISDIR(inode->i_mode))
+ return __d_find_any_alias(inode);
-again:
- discon_alias = NULL;
hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
spin_lock(&alias->d_lock);
- if (S_ISDIR(inode->i_mode) || !d_unhashed(alias)) {
- if (IS_ROOT(alias) &&
- (alias->d_flags & DCACHE_DISCONNECTED)) {
- discon_alias = alias;
- } else {
- __dget_dlock(alias);
- spin_unlock(&alias->d_lock);
- return alias;
- }
- }
- spin_unlock(&alias->d_lock);
- }
- if (discon_alias) {
- alias = discon_alias;
- spin_lock(&alias->d_lock);
- if (S_ISDIR(inode->i_mode) || !d_unhashed(alias)) {
+ if (!d_unhashed(alias)) {
__dget_dlock(alias);
spin_unlock(&alias->d_lock);
return alias;
}
spin_unlock(&alias->d_lock);
- goto again;
}
return NULL;
}
@@ -1941,35 +1955,6 @@ struct dentry *d_make_root(struct inode *root_inode)
}
EXPORT_SYMBOL(d_make_root);
-static struct dentry * __d_find_any_alias(struct inode *inode)
-{
- struct dentry *alias;
-
- if (hlist_empty(&inode->i_dentry))
- return NULL;
- alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
- __dget(alias);
- return alias;
-}
-
-/**
- * d_find_any_alias - find any alias for a given inode
- * @inode: inode to find an alias for
- *
- * If any aliases exist for the given inode, take and return a
- * reference for one of them. If no aliases exist, return %NULL.
- */
-struct dentry *d_find_any_alias(struct inode *inode)
-{
- struct dentry *de;
-
- spin_lock(&inode->i_lock);
- de = __d_find_any_alias(inode);
- spin_unlock(&inode->i_lock);
- return de;
-}
-EXPORT_SYMBOL(d_find_any_alias);
-
static struct dentry *__d_instantiate_anon(struct dentry *dentry,
struct inode *inode,
bool disconnected)