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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>
This commit is contained in:
Jaegeuk Kim 2015-04-27 16:26:24 -07:00
parent 9ea97163c6
commit d8c6822a05
3 changed files with 60 additions and 22 deletions
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57
fs/f2fs/dir.c
View File

@ -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 = {

12
fs/f2fs/f2fs.h
View File

@ -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

13
fs/f2fs/inline.c
View File

@ -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);