From 6e22c691ba0a63ba89f516f0bf1828cf6dce372d Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Mon, 27 Apr 2015 17:12:39 -0700 Subject: f2fs crypto: add filename encryption for f2fs_lookup This patch implements filename encryption support for f2fs_lookup. Note that, f2fs_find_entry should be outside of f2fs_(un)lock_op(). Signed-off-by: Jaegeuk Kim --- fs/f2fs/dir.c | 79 ++++++++++++++++++++++++++++++++++------------------------- 1 file changed, 45 insertions(+), 34 deletions(-) (limited to 'fs/f2fs/dir.c') diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index ab6455de52f3..5e10d9d8099c 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -76,20 +76,10 @@ static unsigned long dir_block_index(unsigned int level, return bidx; } -static bool early_match_name(size_t namelen, f2fs_hash_t namehash, - struct f2fs_dir_entry *de) -{ - if (le16_to_cpu(de->name_len) != namelen) - return false; - - if (de->hash_code != namehash) - return false; - - return true; -} - static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, - struct qstr *name, int *max_slots, + struct f2fs_filename *fname, + f2fs_hash_t namehash, + int *max_slots, struct page **res_page) { struct f2fs_dentry_block *dentry_blk; @@ -99,8 +89,7 @@ static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); - de = find_target_dentry(name, max_slots, &d); - + de = find_target_dentry(fname, namehash, max_slots, &d); if (de) *res_page = dentry_page; else @@ -114,13 +103,15 @@ static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, return de; } -struct f2fs_dir_entry *find_target_dentry(struct qstr *name, int *max_slots, - struct f2fs_dentry_ptr *d) +struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *fname, + f2fs_hash_t namehash, int *max_slots, + struct f2fs_dentry_ptr *d) { struct f2fs_dir_entry *de; unsigned long bit_pos = 0; - f2fs_hash_t namehash = f2fs_dentry_hash(name); int max_len = 0; + struct f2fs_str de_name = FSTR_INIT(NULL, 0); + struct f2fs_str *name = &fname->disk_name; if (max_slots) *max_slots = 0; @@ -132,8 +123,18 @@ struct f2fs_dir_entry *find_target_dentry(struct qstr *name, int *max_slots, } de = &d->dentry[bit_pos]; - if (early_match_name(name->len, namehash, de) && - !memcmp(d->filename[bit_pos], name->name, name->len)) + + /* encrypted case */ + de_name.name = d->filename[bit_pos]; + de_name.len = le16_to_cpu(de->name_len); + + /* show encrypted name */ + if (fname->hash) { + if (de->hash_code == fname->hash) + goto found; + } else if (de_name.len == name->len && + de->hash_code == namehash && + !memcmp(de_name.name, name->name, name->len)) goto found; if (max_slots && max_len > *max_slots) @@ -155,16 +156,21 @@ found: } static struct f2fs_dir_entry *find_in_level(struct inode *dir, - unsigned int level, struct qstr *name, - f2fs_hash_t namehash, struct page **res_page) + unsigned int level, + struct f2fs_filename *fname, + struct page **res_page) { - int s = GET_DENTRY_SLOTS(name->len); + struct qstr name = FSTR_TO_QSTR(&fname->disk_name); + int s = GET_DENTRY_SLOTS(name.len); unsigned int nbucket, nblock; unsigned int bidx, end_block; struct page *dentry_page; struct f2fs_dir_entry *de = NULL; bool room = false; int max_slots; + f2fs_hash_t namehash; + + namehash = f2fs_dentry_hash(&name); f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH); @@ -183,7 +189,8 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir, continue; } - de = find_in_block(dentry_page, name, &max_slots, res_page); + de = find_in_block(dentry_page, fname, namehash, &max_slots, + res_page); if (de) break; @@ -211,30 +218,34 @@ struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, { unsigned long npages = dir_blocks(dir); struct f2fs_dir_entry *de = NULL; - f2fs_hash_t name_hash; unsigned int max_depth; unsigned int level; + struct f2fs_filename fname; + int err; *res_page = NULL; - if (f2fs_has_inline_dentry(dir)) - return find_in_inline_dir(dir, child, res_page); + err = f2fs_fname_setup_filename(dir, child, 1, &fname); + if (err) + return NULL; + + if (f2fs_has_inline_dentry(dir)) { + de = find_in_inline_dir(dir, &fname, res_page); + goto out; + } if (npages == 0) - return NULL; + goto out; - name_hash = f2fs_dentry_hash(child); max_depth = F2FS_I(dir)->i_current_depth; for (level = 0; level < max_depth; level++) { - de = find_in_level(dir, level, child, name_hash, res_page); + de = find_in_level(dir, level, &fname, res_page); if (de) break; } - if (!de && F2FS_I(dir)->chash != name_hash) { - F2FS_I(dir)->chash = name_hash; - F2FS_I(dir)->clevel = level - 1; - } +out: + f2fs_fname_free_filename(&fname); return de; } -- cgit v1.2.3