f2fs crypto: add filename encryption for f2fs_add_link

This patch adds filename encryption support for f2fs_add_link.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index f7293a2674b23070784af011b63eac9c5a31dc74..750a6883f04720ed1e9b922920753d05dc998c0a 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -507,24 +507,33 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
        unsigned long bidx, block;
        f2fs_hash_t dentry_hash;
        unsigned int nbucket, nblock;
-       size_t namelen = name->len;
        struct page *dentry_page = NULL;
        struct f2fs_dentry_block *dentry_blk = NULL;
        struct f2fs_dentry_ptr d;
-       int slots = GET_DENTRY_SLOTS(namelen);
        struct page *page = NULL;
-       int err = 0;
+       struct f2fs_filename fname;
+       struct qstr new_name;
+       int slots, err;
+
+       err = f2fs_fname_setup_filename(dir, name, 0, &fname);
+       if (err)
+               return err;
+
+       new_name.name = fname_name(&fname);
+       new_name.len = fname_len(&fname);
 
        if (f2fs_has_inline_dentry(dir)) {
-               err = f2fs_add_inline_entry(dir, name, inode, ino, mode);
+               err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode);
                if (!err || err != -EAGAIN)
-                       return err;
+                       goto out;
                else
                        err = 0;
        }
 
-       dentry_hash = f2fs_dentry_hash(name);
        level = 0;
+       slots = GET_DENTRY_SLOTS(new_name.len);
+       dentry_hash = f2fs_dentry_hash(&new_name);
+
        current_depth = F2FS_I(dir)->i_current_depth;
        if (F2FS_I(dir)->chash == dentry_hash) {
                level = F2FS_I(dir)->clevel;
@@ -532,8 +541,10 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
        }
 
 start:
-       if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
-               return -ENOSPC;
+       if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) {
+               err = -ENOSPC;
+               goto out;
+       }
 
        /* Increase the depth, if required */
        if (level == current_depth)
@@ -547,8 +558,10 @@ start:
 
        for (block = bidx; block <= (bidx + nblock - 1); block++) {
                dentry_page = get_new_data_page(dir, NULL, block, true);
-               if (IS_ERR(dentry_page))
-                       return PTR_ERR(dentry_page);
+               if (IS_ERR(dentry_page)) {
+                       err = PTR_ERR(dentry_page);
+                       goto out;
+               }
 
                dentry_blk = kmap(dentry_page);
                bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
@@ -568,7 +581,7 @@ add_dentry:
 
        if (inode) {
                down_write(&F2FS_I(inode)->i_sem);
-               page = init_inode_metadata(inode, dir, name, NULL);
+               page = init_inode_metadata(inode, dir, &new_name, NULL);
                if (IS_ERR(page)) {
                        err = PTR_ERR(page);
                        goto fail;
@@ -576,7 +589,7 @@ add_dentry:
        }
 
        make_dentry_ptr(&d, (void *)dentry_blk, 1);
-       f2fs_update_dentry(ino, mode, &d, name, dentry_hash, bit_pos);
+       f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos);
 
        set_page_dirty(dentry_page);
 
@@ -598,6 +611,8 @@ fail:
        }
        kunmap(dentry_page);
        f2fs_put_page(dentry_page, 1);
+out:
+       f2fs_fname_free_filename(&fname);
        return err;
 }