From 393c038f5c55efc61aa1412954548a9947a45cd4 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 11 Jan 2018 23:26:49 -0500 Subject: f2fs: switch to fscrypt ->symlink() helper functions Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o --- fs/f2fs/namei.c | 66 ++++++++++++++------------------------------------------- 1 file changed, 16 insertions(+), 50 deletions(-) (limited to 'fs/f2fs') diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 28bdf8828e73..5b114844806c 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -496,27 +496,16 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry, struct f2fs_sb_info *sbi = F2FS_I_SB(dir); struct inode *inode; size_t len = strlen(symname); - struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1); - struct fscrypt_symlink_data *sd = NULL; + struct fscrypt_str disk_link; int err; if (unlikely(f2fs_cp_error(sbi))) return -EIO; - if (f2fs_encrypted_inode(dir)) { - err = fscrypt_get_encryption_info(dir); - if (err) - return err; - - if (!fscrypt_has_encryption_key(dir)) - return -ENOKEY; - - disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + - sizeof(struct fscrypt_symlink_data)); - } - - if (disk_link.len > dir->i_sb->s_blocksize) - return -ENAMETOOLONG; + err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize, + &disk_link); + if (err) + return err; err = dquot_initialize(dir); if (err) @@ -526,7 +515,7 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry, if (IS_ERR(inode)) return PTR_ERR(inode); - if (f2fs_encrypted_inode(inode)) + if (IS_ENCRYPTED(inode)) inode->i_op = &f2fs_encrypted_symlink_inode_operations; else inode->i_op = &f2fs_symlink_inode_operations; @@ -536,38 +525,13 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry, f2fs_lock_op(sbi); err = f2fs_add_link(dentry, inode); if (err) - goto out; + goto out_handle_failed_inode; f2fs_unlock_op(sbi); alloc_nid_done(sbi, inode->i_ino); - if (f2fs_encrypted_inode(inode)) { - struct qstr istr = QSTR_INIT(symname, len); - struct fscrypt_str ostr; - - sd = kzalloc(disk_link.len, GFP_NOFS); - if (!sd) { - err = -ENOMEM; - goto err_out; - } - - err = fscrypt_get_encryption_info(inode); - if (err) - goto err_out; - - if (!fscrypt_has_encryption_key(inode)) { - err = -ENOKEY; - goto err_out; - } - - ostr.name = sd->encrypted_path; - ostr.len = disk_link.len; - err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); - if (err) - goto err_out; - - sd->len = cpu_to_le16(ostr.len); - disk_link.name = (char *)sd; - } + err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); + if (err) + goto err_out; err = page_symlink(inode, disk_link.name, disk_link.len); @@ -594,12 +558,14 @@ err_out: f2fs_unlink(dir, dentry); } - kfree(sd); - f2fs_balance_fs(sbi, true); - return err; -out: + goto out_free_encrypted_link; + +out_handle_failed_inode: handle_failed_inode(inode); +out_free_encrypted_link: + if (disk_link.name != (unsigned char *)symname) + kfree(disk_link.name); return err; } -- cgit v1.2.1 From f2329cb687d63b73072281aba5646154237b05d2 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 11 Jan 2018 23:26:49 -0500 Subject: f2fs: switch to fscrypt_get_symlink() Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o --- fs/f2fs/namei.c | 66 ++++++++------------------------------------------------- 1 file changed, 9 insertions(+), 57 deletions(-) (limited to 'fs/f2fs') diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 5b114844806c..37816d2ebb93 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -1137,68 +1137,20 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done) { - struct page *cpage = NULL; - char *caddr, *paddr = NULL; - struct fscrypt_str cstr = FSTR_INIT(NULL, 0); - struct fscrypt_str pstr = FSTR_INIT(NULL, 0); - struct fscrypt_symlink_data *sd; - u32 max_size = inode->i_sb->s_blocksize; - int res; + struct page *page; + const char *target; if (!dentry) return ERR_PTR(-ECHILD); - res = fscrypt_get_encryption_info(inode); - if (res) - return ERR_PTR(res); - - cpage = read_mapping_page(inode->i_mapping, 0, NULL); - if (IS_ERR(cpage)) - return ERR_CAST(cpage); - caddr = page_address(cpage); - - /* Symlink is encrypted */ - sd = (struct fscrypt_symlink_data *)caddr; - cstr.name = sd->encrypted_path; - cstr.len = le16_to_cpu(sd->len); - - /* this is broken symlink case */ - if (unlikely(cstr.len == 0)) { - res = -ENOENT; - goto errout; - } - - if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) { - /* Symlink data on the disk is corrupted */ - res = -EIO; - goto errout; - } - res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr); - if (res) - goto errout; - - res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr); - if (res) - goto errout; - - /* this is broken symlink case */ - if (unlikely(pstr.name[0] == 0)) { - res = -ENOENT; - goto errout; - } - - paddr = pstr.name; - - /* Null-terminate the name */ - paddr[pstr.len] = '\0'; + page = read_mapping_page(inode->i_mapping, 0, NULL); + if (IS_ERR(page)) + return ERR_CAST(page); - put_page(cpage); - set_delayed_call(done, kfree_link, paddr); - return paddr; -errout: - fscrypt_fname_free_buffer(&pstr); - put_page(cpage); - return ERR_PTR(res); + target = fscrypt_get_symlink(inode, page_address(page), + inode->i_sb->s_blocksize, done); + put_page(page); + return target; } const struct inode_operations f2fs_encrypted_symlink_inode_operations = { -- cgit v1.2.1 From 3d204e24d452f96704f5feb83f6b7654245defc9 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 11 Jan 2018 23:30:13 -0500 Subject: fscrypt: remove 'ci' parameter from fscrypt_put_encryption_info() fscrypt_put_encryption_info() is only called when evicting an inode, so the 'struct fscrypt_info *ci' parameter is always NULL, and there cannot be races with other threads. This was cruft left over from the broken key revocation code. Remove the unused parameter and the cmpxchg(). Also remove the #ifdefs around the fscrypt_put_encryption_info() calls, since fscrypt_notsupp.h defines a no-op stub for it. Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o --- fs/f2fs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/f2fs') diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index b4c4f2b25304..22a5607a0518 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -569,7 +569,7 @@ no_delete: !exist_written_data(sbi, inode->i_ino, ORPHAN_INO)); } out_clear: - fscrypt_put_encryption_info(inode, NULL); + fscrypt_put_encryption_info(inode); clear_inode(inode); } -- cgit v1.2.1