f2fs crypto: add filename encryption for f2fs_readdir

This patch implements filename encryption support for f2fs_readdir.

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

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 750a688..ab6455d 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -98,7 +98,7 @@ static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
 
        dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page);
 
-       make_dentry_ptr(&d, (void *)dentry_blk, 1);
+       make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
        de = find_target_dentry(name, max_slots, &d);
 
        if (de)
@@ -356,7 +356,7 @@ static int make_empty_dir(struct inode *inode,
 
        dentry_blk = kmap_atomic(dentry_page);
 
-       make_dentry_ptr(&d, (void *)dentry_blk, 1);
+       make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
        do_make_empty_dir(inode, parent, &d);
 
        kunmap_atomic(dentry_blk);
@@ -588,7 +588,7 @@ add_dentry:
                }
        }
 
-       make_dentry_ptr(&d, (void *)dentry_blk, 1);
+       make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
        f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos);
 
        set_page_dirty(dentry_page);
@@ -750,11 +750,12 @@ bool f2fs_empty_dir(struct inode *dir)
 }
 
 bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
-                                               unsigned int start_pos)
+                               unsigned int start_pos, struct f2fs_str *fstr)
 {
        unsigned char d_type = DT_UNKNOWN;
        unsigned int bit_pos;
        struct f2fs_dir_entry *de = NULL;
+       struct f2fs_str de_name = FSTR_INIT(NULL, 0);
 
        bit_pos = ((unsigned long)ctx->pos % d->max);
 
@@ -768,8 +769,24 @@ bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
                        d_type = f2fs_filetype_table[de->file_type];
                else
                        d_type = DT_UNKNOWN;
-               if (!dir_emit(ctx, d->filename[bit_pos],
-                                       le16_to_cpu(de->name_len),
+
+               /* encrypted case */
+               de_name.name = d->filename[bit_pos];
+               de_name.len = le16_to_cpu(de->name_len);
+
+               if (f2fs_encrypted_inode(d->inode)) {
+                       int save_len = fstr->len;
+                       int ret;
+
+                       ret = f2fs_fname_disk_to_usr(d->inode, &de->hash_code,
+                                                       &de_name, fstr);
+                       de_name = *fstr;
+                       fstr->len = save_len;
+                       if (ret < 0)
+                               return true;
+               }
+
+               if (!dir_emit(ctx, de_name.name, de_name.len,
                                        le32_to_cpu(de->ino), d_type))
                        return true;
 
@@ -788,9 +805,24 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
        struct file_ra_state *ra = &file->f_ra;
        unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
        struct f2fs_dentry_ptr d;
+       struct f2fs_str fstr = FSTR_INIT(NULL, 0);
+       int err = 0;
 
-       if (f2fs_has_inline_dentry(inode))
-               return f2fs_read_inline_dir(file, ctx);
+       err = f2fs_setup_fname_crypto(inode);
+       if (err)
+               return err;
+
+       if (f2fs_encrypted_inode(inode)) {
+               err = f2fs_fname_crypto_alloc_buffer(inode, F2FS_NAME_LEN,
+                                                               &fstr);
+               if (err < 0)
+                       return err;
+       }
+
+       if (f2fs_has_inline_dentry(inode)) {
+               err = f2fs_read_inline_dir(file, ctx, &fstr);
+               goto out;
+       }
 
        /* readahead for multi pages of dir */
        if (npages - n > 1 && !ra_has_index(ra, n))
@@ -804,9 +836,9 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
 
                dentry_blk = kmap(dentry_page);
 
-               make_dentry_ptr(&d, (void *)dentry_blk, 1);
+               make_dentry_ptr(inode, &d, (void *)dentry_blk, 1);
 
-               if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK))
+               if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr))
                        goto stop;
 
                ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
@@ -819,8 +851,9 @@ stop:
                kunmap(dentry_page);
                f2fs_put_page(dentry_page, 1);
        }
-
-       return 0;
+out:
+       f2fs_fname_crypto_free_buffer(&fstr);
+       return err;
 }
 
 const struct file_operations f2fs_dir_operations = {

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4a7a9d3..b478a6f 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -277,15 +277,18 @@ struct f2fs_filename {
 #define fname_len(p)           ((p)->disk_name.len)
 
 struct f2fs_dentry_ptr {
+       struct inode *inode;
        const void *bitmap;
        struct f2fs_dir_entry *dentry;
        __u8 (*filename)[F2FS_SLOT_LEN];
        int max;
 };
 
-static inline void make_dentry_ptr(struct f2fs_dentry_ptr *d,
-                                       void *src, int type)
+static inline void make_dentry_ptr(struct inode *inode,
+               struct f2fs_dentry_ptr *d, void *src, int type)
 {
+       d->inode = inode;
+
        if (type == 1) {
                struct f2fs_dentry_block *t = (struct f2fs_dentry_block *)src;
                d->max = NR_DENTRY_IN_BLOCK;
@@ -1584,7 +1587,7 @@ void set_de_type(struct f2fs_dir_entry *, umode_t);
 struct f2fs_dir_entry *find_target_dentry(struct qstr *, int *,
                        struct f2fs_dentry_ptr *);
 bool f2fs_fill_dentries(struct dir_context *, struct f2fs_dentry_ptr *,
-                       unsigned int);
+                       unsigned int, struct f2fs_str *);
 void do_make_empty_dir(struct inode *, struct inode *,
                        struct f2fs_dentry_ptr *);
 struct page *init_inode_metadata(struct inode *, struct inode *,
@@ -1937,7 +1940,8 @@ int f2fs_add_inline_entry(struct inode *, const struct qstr *, struct inode *,
 void f2fs_delete_inline_entry(struct f2fs_dir_entry *, struct page *,
                                                struct inode *, struct inode *);
 bool f2fs_empty_inline_dir(struct inode *);
-int f2fs_read_inline_dir(struct file *, struct dir_context *);
+int f2fs_read_inline_dir(struct file *, struct dir_context *,
+                                               struct f2fs_str *);
 
 /*
  * crypto support

diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index b0b7805..dd51d3f 100644 (file)
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -298,7 +298,7 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 
        inline_dentry = inline_data_addr(ipage);
 
-       make_dentry_ptr(&d, (void *)inline_dentry, 2);
+       make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
        de = find_target_dentry(name, NULL, &d);
 
        unlock_page(ipage);
@@ -342,7 +342,7 @@ int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 
        dentry_blk = inline_data_addr(ipage);
 
-       make_dentry_ptr(&d, (void *)dentry_blk, 2);
+       make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
        do_make_empty_dir(inode, parent, &d);
 
        set_page_dirty(ipage);
@@ -446,7 +446,7 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
        f2fs_wait_on_page_writeback(ipage, NODE);
 
        name_hash = f2fs_dentry_hash(name);
-       make_dentry_ptr(&d, (void *)dentry_blk, 2);
+       make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
        f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 
        set_page_dirty(ipage);
@@ -523,7 +523,8 @@ bool f2fs_empty_inline_dir(struct inode *dir)
        return true;
 }
 
-int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
+int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
+                               struct f2fs_str *fstr)
 {
        struct inode *inode = file_inode(file);
        struct f2fs_inline_dentry *inline_dentry = NULL;
@@ -539,9 +540,9 @@ int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
 
        inline_dentry = inline_data_addr(ipage);
 
-       make_dentry_ptr(&d, (void *)inline_dentry, 2);
+       make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);
 
-       if (!f2fs_fill_dentries(ctx, &d, 0))
+       if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
                ctx->pos = NR_INLINE_DENTRY;
 
        f2fs_put_page(ipage, 1);