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Linux/vnops: implement STATX_DIOALIGN

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This statx(2) mask returns the alignment restrictions for O_DIRECT
access on the given file.

We're expected to return both memory and IO alignment. For memory, it's
always PAGE_SIZE. For IO, we return the current block size for the file,
which is the required alignment for an arbitrary block, and for the
first block we'll fall back to the ARC when necessary, so it should
always work.

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16972
This commit is contained in:
Rob Norris
2025-03-14 04:15:14 +11:00
committed by Tony Hutter
parent ad07b09cc3
commit 6503f8c6f0
11 changed files with 548 additions and 2 deletions
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module/os/linux/zfs/zpl_inode.c
+13
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@@ -21,6 +21,7 @@
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
* Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
*/
@@ -30,6 +31,7 @@
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
#include <sys/dmu_objset.h>
#include <sys/spa_impl.h>
#include <sys/vfs.h>
#include <sys/zpl.h>
#include <sys/file.h>
@@ -490,6 +492,17 @@ zpl_getattr_impl(const struct path *path, struct kstat *stat, u32 request_mask,
}
#endif
#ifdef STATX_DIOALIGN
if (request_mask & STATX_DIOALIGN) {
uint64_t align;
if (zfs_get_direct_alignment(zp, &align) == 0) {
stat->dio_mem_align = PAGE_SIZE;
stat->dio_offset_align = align;
stat->result_mask |= STATX_DIOALIGN;
}
}
#endif
#ifdef STATX_ATTR_IMMUTABLE
if (zp->z_pflags & ZFS_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;