[PATCH v2 00/23] fs-verity support for XFS

[Andrey Albershteyn]

Hi all,

This is V2 of fs-verity support in XFS. In this series I did
numerous changes from V1 which are described below.

This patchset introduces fs-verity [5] support for XFS. This
implementation utilizes extended attributes to store fs-verity
metadata. The Merkle tree blocks are stored in the remote extended
attributes.

A few key points:
- fs-verity metadata is stored in extended attributes
- Direct path and DAX are disabled for inodes with fs-verity
- Pages are verified in iomap's read IO path (offloaded to
  workqueue)
- New workqueue for verification processing
- New ro-compat flag
- Inodes with fs-verity have new on-disk diflag
- xfs_attr_get() can return buffer with the attribute

The patchset is tested with xfstests -g auto on xfs_1k, xfs_4k,
xfs_1k_quota, and xfs_4k_quota. Haven't found any major failures.

Patches [6/23] and [7/23] touch ext4, f2fs, btrfs, and patch [8/23]
touches erofs, gfs2, and zonefs.

The patchset consist of four parts:
- [1..4]: Patches from Parent Pointer patchset which add binary
          xattr names with a few deps
- [5..7]: Improvements to core fs-verity
- [8..9]: Add read path verification to iomap
- [10..23]: Integration of fs-verity to xfs

Changes from V1:
- Added parent pointer patches for easier testing
- Many issues and refactoring points fixed from the V1 review
- Adjusted for recent changes in fs-verity core (folios, non-4k)
- Dropped disabling of large folios
- Completely new fsverity patches (fix, callout, log_blocksize)
- Change approach to verification in iomap to the same one as in
  write path. Callouts to fs instead of direct fs-verity use.
- New XFS workqueue for post read folio verification
- xfs_attr_get() can return underlying xfs_buf
- xfs_bufs are marked with XBF_VERITY_CHECKED to track verified
  blocks

kernel:
[1]: https://github.com/alberand/linux/tree/xfs-verity-v2

xfsprogs:
[2]: https://github.com/alberand/xfsprogs/tree/fsverity-v2

xfstests:
[3]: https://github.com/alberand/xfstests/tree/fsverity-v2

v1:
[4]: https://lore.kernel.org/linux-xfs/20221213172935.680971-1-aalbersh@redhat.com/

fs-verity:
[5]: https://www.kernel.org/doc/html/latest/filesystems/fsverity.html

Thanks,
Andrey

Allison Henderson (4):
  xfs: Add new name to attri/d
  xfs: add parent pointer support to attribute code
  xfs: define parent pointer xattr format
  xfs: Add xfs_verify_pptr

Andrey Albershteyn (19):
  fsverity: make fsverity_verify_folio() accept folio's offset and size
  fsverity: add drop_page() callout
  fsverity: pass Merkle tree block size to ->read_merkle_tree_page()
  iomap: hoist iomap_readpage_ctx from the iomap_readahead/_folio
  iomap: allow filesystem to implement read path verification
  xfs: add XBF_VERITY_CHECKED xfs_buf flag
  xfs: add XFS_DA_OP_BUFFER to make xfs_attr_get() return buffer
  xfs: introduce workqueue for post read IO work
  xfs: add iomap's readpage operations
  xfs: add attribute type for fs-verity
  xfs: add fs-verity ro-compat flag
  xfs: add inode on-disk VERITY flag
  xfs: initialize fs-verity on file open and cleanup on inode
    destruction
  xfs: don't allow to enable DAX on fs-verity sealsed inode
  xfs: disable direct read path for fs-verity sealed files
  xfs: add fs-verity support
  xfs: handle merkle tree block size != fs blocksize != PAGE_SIZE
  xfs: add fs-verity ioctls
  xfs: enable ro-compat fs-verity flag

 fs/btrfs/verity.c               |  15 +-
 fs/erofs/data.c                 |  12 +-
 fs/ext4/verity.c                |   9 +-
 fs/f2fs/verity.c                |   9 +-
 fs/gfs2/aops.c                  |  10 +-
 fs/ioctl.c                      |   4 +
 fs/iomap/buffered-io.c          |  89 ++++++-----
 fs/verity/read_metadata.c       |   7 +-
 fs/verity/verify.c              |   9 +-
 fs/xfs/Makefile                 |   1 +
 fs/xfs/libxfs/xfs_attr.c        |  81 +++++++++-
 fs/xfs/libxfs/xfs_attr.h        |   7 +-
 fs/xfs/libxfs/xfs_attr_leaf.c   |   7 +
 fs/xfs/libxfs/xfs_attr_remote.c |  13 +-
 fs/xfs/libxfs/xfs_da_btree.h    |   7 +-
 fs/xfs/libxfs/xfs_da_format.h   |  46 +++++-
 fs/xfs/libxfs/xfs_format.h      |  14 +-
 fs/xfs/libxfs/xfs_log_format.h  |   8 +-
 fs/xfs/libxfs/xfs_sb.c          |   2 +
 fs/xfs/scrub/attr.c             |   4 +-
 fs/xfs/xfs_aops.c               |  61 +++++++-
 fs/xfs/xfs_attr_item.c          | 142 +++++++++++++++---
 fs/xfs/xfs_attr_item.h          |   1 +
 fs/xfs/xfs_attr_list.c          |  17 ++-
 fs/xfs/xfs_buf.h                |  17 ++-
 fs/xfs/xfs_file.c               |  22 ++-
 fs/xfs/xfs_inode.c              |   2 +
 fs/xfs/xfs_inode.h              |   3 +-
 fs/xfs/xfs_ioctl.c              |  22 +++
 fs/xfs/xfs_iomap.c              |  14 ++
 fs/xfs/xfs_iops.c               |   4 +
 fs/xfs/xfs_linux.h              |   1 +
 fs/xfs/xfs_mount.h              |   3 +
 fs/xfs/xfs_ondisk.h             |   4 +
 fs/xfs/xfs_super.c              |  19 +++
 fs/xfs/xfs_trace.h              |   1 +
 fs/xfs/xfs_verity.c             | 256 ++++++++++++++++++++++++++++++++
 fs/xfs/xfs_verity.h             |  27 ++++
 fs/xfs/xfs_xattr.c              |   9 ++
 fs/zonefs/file.c                |  12 +-
 include/linux/fsverity.h        |  18 ++-
 include/linux/iomap.h           |  39 ++++-
 include/uapi/linux/fs.h         |   1 +
 43 files changed, 923 insertions(+), 126 deletions(-)
 create mode 100644 fs/xfs/xfs_verity.c
 create mode 100644 fs/xfs/xfs_verity.h

-- 
2.38.4