[ 122/123] cifs: rename cifs_readdir_lookup to cifs_prime_dcache and make it void return

Greg Kroah-Hartman
2013-01-09T20:41:37Z

From: Jeff Layton <jlayton@redhat.com>

commit eb1b3fa5cdb9c27bdec8f262acf757a06588eb2d upstream.

The caller doesn't do anything with the dentry, so there's no point in
holding a reference to it on return. Also cifs_prime_dcache better
describes the actual purpose of the function.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/cifs/readdir.c | 42 ++++++++++++++++++------------------------
1 file changed, 18 insertions(+), 24 deletions(-)

--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -66,18 +66,20 @@ static inline void dump_cifs_file_struct
#endif /* DEBUG2 */

/*
+ * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
+ *
* Find the dentry that matches "name". If there isn't one, create one. If it's
* a negative dentry or the uniqueid changed, then drop it and recreate it.
*/
-static struct dentry *
-cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
+static void
+cifs_prime_dcache(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
struct dentry *dentry, *alias;
struct inode *inode;
struct super_block *sb = parent->d_inode->i_sb;

- cFYI(1, "For %s", name->name);
+ cFYI(1, "%s: for %s", __func__, name->name);

if (parent->d_op && parent->d_op->d_hash)
parent->d_op->d_hash(parent, parent->d_inode, name);
@@ -87,37 +89,32 @@ cifs_readdir_lookup(struct dentry *paren
dentry = d_lookup(parent, name);
if (dentry) {
int err;
+
inode = dentry->d_inode;
/* update inode in place if i_ino didn't change */
if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
cifs_fattr_to_inode(inode, fattr);
- return dentry;
+ goto out;
}
err = d_invalidate(dentry);
dput(dentry);
if (err)
- return NULL;
+ return;
}

dentry = d_alloc(parent, name);
- if (dentry == NULL)
- return NULL;
+ if (!dentry)
+ return;

inode = cifs_iget(sb, fattr);
- if (!inode) {
- dput(dentry);
- return NULL;
- }
+ if (!inode)
+ goto out;

alias = d_materialise_unique(dentry, inode);
- if (alias != NULL) {
- dput(dentry);
- if (IS_ERR(alias))
- return NULL;
- dentry = alias;
- }
-
- return dentry;
+ if (alias && !IS_ERR(alias))
+ dput(alias);
+out:
+ dput(dentry);
}

static void
@@ -652,7 +649,6 @@ static int cifs_filldir(char *find_entry
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_dirent de = { NULL, };
struct cifs_fattr fattr;
- struct dentry *dentry;
struct qstr name;
int rc = 0;
ino_t ino;
@@ -723,13 +719,11 @@ static int cifs_filldir(char *find_entry
*/
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;

- ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
- dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
+ cifs_prime_dcache(file->f_dentry, &name, &fattr);

+ ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
fattr.cf_dtype);
-
- dput(dentry);
return rc;
}