diff options
| author | Andrey Albershteyn <aalbersh@kernel.org> | 2026-05-20 15:37:05 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-06-05 14:36:22 +0300 |
| commit | 63e242afa4661632786a2129cf297a135a6995ba (patch) | |
| tree | 787aa6ed97dee295e1ca66626641fac59a6798a5 /include | |
| parent | 07d09774e2bfa21dedcee3ef45892bb20827b12c (diff) | |
| download | linux-63e242afa4661632786a2129cf297a135a6995ba.tar.xz | |
iomap: introduce IOMAP_F_FSVERITY and teach writeback to handle fsverity
This flag indicates that I/O is for fsverity metadata.
In the write path skip i_size check and i_size updates as metadata is
past EOF. In writeback don't update i_size and continue writeback if
even folio is beyond EOF. In read path don't zero fsverity folios, again
they are past EOF.
The iomap_block_needs_zeroing() is also called from write path. For
folios of larger order we don't want to zero out pages in the folio as
these could contain other merkle tree blocks. For fsverity, filesystem
will request to read PAGE_SIZE memory regions. For data folios, iomap
will zero the rest of the folio for anything which is beyond EOF. We
don't want this for fsverity folios.
Christian Brauner <brauner@kernel.org> says:
Changed IOMAP_F_FSVERITY from (1U << 10) to (1U << 11) to avoid colliding
with IOMAP_F_ZERO_TAIL, which already uses (1U << 10).
Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Link: https://patch.msgid.link/20260520123722.405752-8-aalbersh@kernel.org
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/iomap.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h index cea6bbc97b6e..5b2b40e81b61 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -92,6 +92,14 @@ struct vm_fault; #define IOMAP_F_ZERO_TAIL (1U << 10) /* + * Indicates reads and writes of fsverity metadata. + * + * Fsverity metadata is stored after the regular file data and thus beyond + * i_size. + */ +#define IOMAP_F_FSVERITY (1U << 11) + +/* * Flag reserved for file system specific usage */ #define IOMAP_F_PRIVATE (1U << 12) |