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fs/dax: remove FS_DAX_LIMITED config option

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The dcssblk driver was the last user of FS_DAX_LIMITED.  That was marked
broken by 653d7825c1 ("dcssblk: mark DAX broken, remove FS_DAX_LIMITED
support") to allow removal of PFN_SPECIAL.  However the FS_DAX_LIMITED
config option itself was not removed, so do that now.

Link: https://lkml.kernel.org/r/b47bf164b4a1013d736fa1a3d501bc8b8e71311f.1750323463.git-series.apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Balbir Singh <balbirs@nvidia.com>
Cc: Björn Töpel <bjorn@kernel.org>
Cc: Björn Töpel <bjorn@rivosinc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Deepak Gupta <debug@rivosinc.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Inki Dae <m.szyprowski@samsung.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Groves <john@groves.net>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alistair Popple 2025-06-19 18:58:02 +10:00 • committed by Andrew Morton
parent bea0cc7cf4
commit 28dc88c39e
3 changed files with 1 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

9
fs/Kconfig
View file

@ -59,7 +59,7 @@ endif # BLOCK
config FS_DAX
bool "File system based Direct Access (DAX) support"
depends on MMU
depends on ZONE_DEVICE || FS_DAX_LIMITED
depends on ZONE_DEVICE
select FS_IOMAP
select DAX
help
@ -95,13 +95,6 @@ config FS_DAX_PMD
depends on ZONE_DEVICE
depends on TRANSPARENT_HUGEPAGE
# Selected by DAX drivers that do not expect filesystem DAX to support
# get_user_pages() of DAX mappings. I.e. "limited" indicates no support
# for fork() of processes with MAP_SHARED mappings or support for
# direct-I/O to a DAX mapping.
config FS_DAX_LIMITED
bool
# Posix ACL utility routines
#
# Note: Posix ACLs can be implemented without these helpers. Never use

12
fs/dax.c
View file

@ -449,9 +449,6 @@ static void dax_associate_entry(void *entry, struct address_space *mapping,
if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry))
return;
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
return;
index = linear_page_index(vma, address & ~(size - 1));
if (shared && (folio->mapping || dax_folio_is_shared(folio))) {
if (folio->mapping)
@ -474,9 +471,6 @@ static void dax_disassociate_entry(void *entry, struct address_space *mapping,
{
struct folio *folio = dax_to_folio(entry);
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
return;
if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry))
return;
@ -768,12 +762,6 @@ struct page *dax_layout_busy_page_range(struct address_space *mapping,
pgoff_t end_idx;
XA_STATE(xas, &mapping->i_pages, start_idx);
/*
* In the 'limited' case get_user_pages() for dax is disabled.
*/
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
return NULL;
if (!dax_mapping(mapping))
return NULL;

4
mm/memremap.c
View file

@ -332,10 +332,6 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
}
break;
case MEMORY_DEVICE_FS_DAX:
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
WARN(1, "File system DAX not supported\n");
return ERR_PTR(-EINVAL);
}
params.pgprot = pgprot_decrypted(params.pgprot);
break;
case MEMORY_DEVICE_GENERIC: