[PATCH 12/18] f2fs crypto: add filename encryption for f2fs_add_link

Jaegeuk Kim
2015-05-09T04:21:42Z

This patch adds filename encryption support for f2fs_add_link.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/dir.c | 39 +++++++++++++++++++++++++++------------
1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index f7293a2..750a688 100644
--- 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;
}

--
2.1.1