| Message ID | 85b570f5b467dab2da4e125166283e3d3d1aada2.1689564024.git.sweettea-kernel@dorminy.me (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | btrfs: add encryption feature | expand |
On Sun, Jul 16, 2023 at 11:52:47PM -0400, Sweet Tea Dorminy wrote: > With the advent of storing fscrypt contexts with each encrypted extent, > extents will have a variable length depending on encryption status. > Add accessors for the encryption field, and update all the checks for > file extents. > > Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> > --- > fs/btrfs/ctree.h | 2 ++ > fs/btrfs/file.c | 4 ++-- > fs/btrfs/inode.c | 9 +++++++-- > fs/btrfs/reflink.c | 1 + > fs/btrfs/tree-log.c | 2 +- > include/uapi/linux/btrfs_tree.h | 5 +++++ > 6 files changed, 18 insertions(+), 5 deletions(-) > > diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h > index f2d2b313bde5..b1afcfc62f75 100644 > --- a/fs/btrfs/ctree.h > +++ b/fs/btrfs/ctree.h > @@ -364,6 +364,8 @@ struct btrfs_replace_extent_info { > u64 file_offset; > /* Pointer to a file extent item of type regular or prealloc. */ > char *extent_buf; > + /* The length of @extent_buf */ > + u32 extent_buf_size; > /* > * Set to true when attempting to replace a file range with a new extent > * described by this structure, set to false when attempting to clone an > diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c > index 73038908876a..4988c9317234 100644 > --- a/fs/btrfs/file.c > +++ b/fs/btrfs/file.c > @@ -2246,14 +2246,14 @@ static int btrfs_insert_replace_extent(struct btrfs_trans_handle *trans, > key.type = BTRFS_EXTENT_DATA_KEY; > key.offset = extent_info->file_offset; > ret = btrfs_insert_empty_item(trans, root, path, &key, > - sizeof(struct btrfs_file_extent_item)); > + extent_info->extent_buf_size); > if (ret) > return ret; > leaf = path->nodes[0]; > slot = path->slots[0]; > write_extent_buffer(leaf, extent_info->extent_buf, > btrfs_item_ptr_offset(leaf, slot), > - sizeof(struct btrfs_file_extent_item)); > + extent_info->extent_buf_size); > extent = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); > ASSERT(btrfs_file_extent_type(leaf, extent) != BTRFS_FILE_EXTENT_INLINE); > btrfs_set_file_extent_offset(leaf, extent, extent_info->data_offset); > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c > index f68d74dec5ed..83098779dad2 100644 > --- a/fs/btrfs/inode.c > +++ b/fs/btrfs/inode.c > @@ -3036,6 +3036,9 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, > u64 num_bytes = btrfs_stack_file_extent_num_bytes(stack_fi); > u64 ram_bytes = btrfs_stack_file_extent_ram_bytes(stack_fi); > struct btrfs_drop_extents_args drop_args = { 0 }; > + size_t fscrypt_context_size = > + btrfs_stack_file_extent_encryption(stack_fi) ? > + FSCRYPT_SET_CONTEXT_MAX_SIZE : 0; > int ret; > > path = btrfs_alloc_path(); > @@ -3055,7 +3058,7 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, > drop_args.start = file_pos; > drop_args.end = file_pos + num_bytes; > drop_args.replace_extent = true; > - drop_args.extent_item_size = sizeof(*stack_fi); > + drop_args.extent_item_size = sizeof(*stack_fi) + fscrypt_context_size; > ret = btrfs_drop_extents(trans, root, inode, &drop_args); > if (ret) > goto out; > @@ -3066,7 +3069,7 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, > ins.type = BTRFS_EXTENT_DATA_KEY; > > ret = btrfs_insert_empty_item(trans, root, path, &ins, > - sizeof(*stack_fi)); > + sizeof(*stack_fi) + fscrypt_context_size); > if (ret) > goto out; > } > @@ -9770,6 +9773,7 @@ static struct btrfs_trans_handle *insert_prealloc_file_extent( > u64 len = ins->offset; > int qgroup_released; > int ret; > + size_t fscrypt_context_size = 0; > > memset(&stack_fi, 0, sizeof(stack_fi)); > > @@ -9802,6 +9806,7 @@ static struct btrfs_trans_handle *insert_prealloc_file_extent( > extent_info.data_len = len; > extent_info.file_offset = file_offset; > extent_info.extent_buf = (char *)&stack_fi; > + extent_info.extent_buf_size = sizeof(stack_fi) + fscrypt_context_size; > extent_info.is_new_extent = true; > extent_info.update_times = true; > extent_info.qgroup_reserved = qgroup_released; > diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c > index ad722f495c9b..9f3b5748f39b 100644 > --- a/fs/btrfs/reflink.c > +++ b/fs/btrfs/reflink.c > @@ -502,6 +502,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode, > clone_info.data_len = datal; > clone_info.file_offset = new_key.offset; > clone_info.extent_buf = buf; > + clone_info.extent_buf_size = size; > clone_info.is_new_extent = false; > clone_info.update_times = !no_time_update; > ret = btrfs_replace_file_extents(BTRFS_I(inode), path, > diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c > index a49a05cfbac4..82c91097672b 100644 > --- a/fs/btrfs/tree-log.c > +++ b/fs/btrfs/tree-log.c > @@ -4689,7 +4689,7 @@ static int log_one_extent(struct btrfs_trans_handle *trans, > key.offset = em->start; > > ret = btrfs_insert_empty_item(trans, log, path, &key, > - sizeof(fi)); > + sizeof(fi) + fscrypt_context_size); This bit fails to compile, it compiles after the next patch, you'll want to fix this up. Thanks, Josef
On Sun, Jul 16, 2023 at 11:52:47PM -0400, Sweet Tea Dorminy wrote: > With the advent of storing fscrypt contexts with each encrypted extent, > extents will have a variable length depending on encryption status. > Add accessors for the encryption field, and update all the checks for > file extents. > > Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> > --- > fs/btrfs/ctree.h | 2 ++ > fs/btrfs/file.c | 4 ++-- > fs/btrfs/inode.c | 9 +++++++-- > fs/btrfs/reflink.c | 1 + > fs/btrfs/tree-log.c | 2 +- > include/uapi/linux/btrfs_tree.h | 5 +++++ > 6 files changed, 18 insertions(+), 5 deletions(-) > > diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h > index f2d2b313bde5..b1afcfc62f75 100644 > --- a/fs/btrfs/ctree.h > +++ b/fs/btrfs/ctree.h > @@ -364,6 +364,8 @@ struct btrfs_replace_extent_info { > u64 file_offset; > /* Pointer to a file extent item of type regular or prealloc. */ > char *extent_buf; > + /* The length of @extent_buf */ > + u32 extent_buf_size; > /* > * Set to true when attempting to replace a file range with a new extent > * described by this structure, set to false when attempting to clone an > diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c > index 73038908876a..4988c9317234 100644 > --- a/fs/btrfs/file.c > +++ b/fs/btrfs/file.c > @@ -2246,14 +2246,14 @@ static int btrfs_insert_replace_extent(struct btrfs_trans_handle *trans, > key.type = BTRFS_EXTENT_DATA_KEY; > key.offset = extent_info->file_offset; > ret = btrfs_insert_empty_item(trans, root, path, &key, > - sizeof(struct btrfs_file_extent_item)); > + extent_info->extent_buf_size); > if (ret) > return ret; > leaf = path->nodes[0]; > slot = path->slots[0]; > write_extent_buffer(leaf, extent_info->extent_buf, > btrfs_item_ptr_offset(leaf, slot), > - sizeof(struct btrfs_file_extent_item)); > + extent_info->extent_buf_size); > extent = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); > ASSERT(btrfs_file_extent_type(leaf, extent) != BTRFS_FILE_EXTENT_INLINE); > btrfs_set_file_extent_offset(leaf, extent, extent_info->data_offset); > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c > index f68d74dec5ed..83098779dad2 100644 > --- a/fs/btrfs/inode.c > +++ b/fs/btrfs/inode.c > @@ -3036,6 +3036,9 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, > u64 num_bytes = btrfs_stack_file_extent_num_bytes(stack_fi); > u64 ram_bytes = btrfs_stack_file_extent_ram_bytes(stack_fi); > struct btrfs_drop_extents_args drop_args = { 0 }; > + size_t fscrypt_context_size = > + btrfs_stack_file_extent_encryption(stack_fi) ? > + FSCRYPT_SET_CONTEXT_MAX_SIZE : 0; > int ret; > > path = btrfs_alloc_path(); > @@ -3055,7 +3058,7 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, > drop_args.start = file_pos; > drop_args.end = file_pos + num_bytes; > drop_args.replace_extent = true; > - drop_args.extent_item_size = sizeof(*stack_fi); > + drop_args.extent_item_size = sizeof(*stack_fi) + fscrypt_context_size; > ret = btrfs_drop_extents(trans, root, inode, &drop_args); > if (ret) > goto out; > @@ -3066,7 +3069,7 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, > ins.type = BTRFS_EXTENT_DATA_KEY; > > ret = btrfs_insert_empty_item(trans, root, path, &ins, > - sizeof(*stack_fi)); > + sizeof(*stack_fi) + fscrypt_context_size); > if (ret) > goto out; > } > @@ -9770,6 +9773,7 @@ static struct btrfs_trans_handle *insert_prealloc_file_extent( > u64 len = ins->offset; > int qgroup_released; > int ret; > + size_t fscrypt_context_size = 0; > > memset(&stack_fi, 0, sizeof(stack_fi)); > > @@ -9802,6 +9806,7 @@ static struct btrfs_trans_handle *insert_prealloc_file_extent( > extent_info.data_len = len; > extent_info.file_offset = file_offset; > extent_info.extent_buf = (char *)&stack_fi; > + extent_info.extent_buf_size = sizeof(stack_fi) + fscrypt_context_size; > extent_info.is_new_extent = true; > extent_info.update_times = true; > extent_info.qgroup_reserved = qgroup_released; > diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c > index ad722f495c9b..9f3b5748f39b 100644 > --- a/fs/btrfs/reflink.c > +++ b/fs/btrfs/reflink.c > @@ -502,6 +502,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode, > clone_info.data_len = datal; > clone_info.file_offset = new_key.offset; > clone_info.extent_buf = buf; > + clone_info.extent_buf_size = size; > clone_info.is_new_extent = false; > clone_info.update_times = !no_time_update; > ret = btrfs_replace_file_extents(BTRFS_I(inode), path, > diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c > index a49a05cfbac4..82c91097672b 100644 > --- a/fs/btrfs/tree-log.c > +++ b/fs/btrfs/tree-log.c > @@ -4689,7 +4689,7 @@ static int log_one_extent(struct btrfs_trans_handle *trans, > key.offset = em->start; > > ret = btrfs_insert_empty_item(trans, log, path, &key, > - sizeof(fi)); > + sizeof(fi) + fscrypt_context_size); > if (ret) > return ret; > } > diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h > index 029af0aeb65d..ea4903cfd926 100644 > --- a/include/uapi/linux/btrfs_tree.h > +++ b/include/uapi/linux/btrfs_tree.h > @@ -1048,6 +1048,11 @@ struct btrfs_file_extent_item { > * but not for stat. > */ > __u8 compression; > + > + /* > + * 2 bits of encryption type in the lower bits, 6 bits of context size > + * in the upper bits. Unencrypted value is 0. > + */ Additionally this comment needed to be in the patch changing the format. Thanks, Josef
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index f2d2b313bde5..b1afcfc62f75 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -364,6 +364,8 @@ struct btrfs_replace_extent_info { u64 file_offset; /* Pointer to a file extent item of type regular or prealloc. */ char *extent_buf; + /* The length of @extent_buf */ + u32 extent_buf_size; /* * Set to true when attempting to replace a file range with a new extent * described by this structure, set to false when attempting to clone an diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 73038908876a..4988c9317234 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2246,14 +2246,14 @@ static int btrfs_insert_replace_extent(struct btrfs_trans_handle *trans, key.type = BTRFS_EXTENT_DATA_KEY; key.offset = extent_info->file_offset; ret = btrfs_insert_empty_item(trans, root, path, &key, - sizeof(struct btrfs_file_extent_item)); + extent_info->extent_buf_size); if (ret) return ret; leaf = path->nodes[0]; slot = path->slots[0]; write_extent_buffer(leaf, extent_info->extent_buf, btrfs_item_ptr_offset(leaf, slot), - sizeof(struct btrfs_file_extent_item)); + extent_info->extent_buf_size); extent = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); ASSERT(btrfs_file_extent_type(leaf, extent) != BTRFS_FILE_EXTENT_INLINE); btrfs_set_file_extent_offset(leaf, extent, extent_info->data_offset); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index f68d74dec5ed..83098779dad2 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3036,6 +3036,9 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, u64 num_bytes = btrfs_stack_file_extent_num_bytes(stack_fi); u64 ram_bytes = btrfs_stack_file_extent_ram_bytes(stack_fi); struct btrfs_drop_extents_args drop_args = { 0 }; + size_t fscrypt_context_size = + btrfs_stack_file_extent_encryption(stack_fi) ? + FSCRYPT_SET_CONTEXT_MAX_SIZE : 0; int ret; path = btrfs_alloc_path(); @@ -3055,7 +3058,7 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, drop_args.start = file_pos; drop_args.end = file_pos + num_bytes; drop_args.replace_extent = true; - drop_args.extent_item_size = sizeof(*stack_fi); + drop_args.extent_item_size = sizeof(*stack_fi) + fscrypt_context_size; ret = btrfs_drop_extents(trans, root, inode, &drop_args); if (ret) goto out; @@ -3066,7 +3069,7 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, ins.type = BTRFS_EXTENT_DATA_KEY; ret = btrfs_insert_empty_item(trans, root, path, &ins, - sizeof(*stack_fi)); + sizeof(*stack_fi) + fscrypt_context_size); if (ret) goto out; } @@ -9770,6 +9773,7 @@ static struct btrfs_trans_handle *insert_prealloc_file_extent( u64 len = ins->offset; int qgroup_released; int ret; + size_t fscrypt_context_size = 0; memset(&stack_fi, 0, sizeof(stack_fi)); @@ -9802,6 +9806,7 @@ static struct btrfs_trans_handle *insert_prealloc_file_extent( extent_info.data_len = len; extent_info.file_offset = file_offset; extent_info.extent_buf = (char *)&stack_fi; + extent_info.extent_buf_size = sizeof(stack_fi) + fscrypt_context_size; extent_info.is_new_extent = true; extent_info.update_times = true; extent_info.qgroup_reserved = qgroup_released; diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c index ad722f495c9b..9f3b5748f39b 100644 --- a/fs/btrfs/reflink.c +++ b/fs/btrfs/reflink.c @@ -502,6 +502,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode, clone_info.data_len = datal; clone_info.file_offset = new_key.offset; clone_info.extent_buf = buf; + clone_info.extent_buf_size = size; clone_info.is_new_extent = false; clone_info.update_times = !no_time_update; ret = btrfs_replace_file_extents(BTRFS_I(inode), path, diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index a49a05cfbac4..82c91097672b 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -4689,7 +4689,7 @@ static int log_one_extent(struct btrfs_trans_handle *trans, key.offset = em->start; ret = btrfs_insert_empty_item(trans, log, path, &key, - sizeof(fi)); + sizeof(fi) + fscrypt_context_size); if (ret) return ret; } diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h index 029af0aeb65d..ea4903cfd926 100644 --- a/include/uapi/linux/btrfs_tree.h +++ b/include/uapi/linux/btrfs_tree.h @@ -1048,6 +1048,11 @@ struct btrfs_file_extent_item { * but not for stat. */ __u8 compression; + + /* + * 2 bits of encryption type in the lower bits, 6 bits of context size + * in the upper bits. Unencrypted value is 0. + */ __u8 encryption; __le16 other_encoding; /* spare for later use */
With the advent of storing fscrypt contexts with each encrypted extent, extents will have a variable length depending on encryption status. Add accessors for the encryption field, and update all the checks for file extents. Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> --- fs/btrfs/ctree.h | 2 ++ fs/btrfs/file.c | 4 ++-- fs/btrfs/inode.c | 9 +++++++-- fs/btrfs/reflink.c | 1 + fs/btrfs/tree-log.c | 2 +- include/uapi/linux/btrfs_tree.h | 5 +++++ 6 files changed, 18 insertions(+), 5 deletions(-)