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fs/dax: create a common implementation to break DAX layouts

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Prior to freeing a block file systems supporting FS DAX must check that
the associated pages are both unmapped from user-space and not undergoing
DMA or other access from eg.  get_user_pages().  This is achieved by
unmapping the file range and scanning the FS DAX page-cache to see if any
pages within the mapping have an elevated refcount.

This is done using two functions - dax_layout_busy_page_range() which
returns a page to wait for the refcount to become idle on.  Rather than
open-code this introduce a common implementation to both unmap and wait
for the page to become idle.

Link: https://lkml.kernel.org/r/c4d381e41fc618296cee2820403c166d80599d5c.1740713401.git-series.apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Alison Schofield <alison.schofield@intel.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Asahi Lina <lina@asahilina.net>
Cc: Balbir Singh <balbirs@nvidia.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: linmiaohe <linmiaohe@huawei.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Matthew Wilcow (Oracle) <willy@infradead.org>
Cc: Michael "Camp Drill Sergeant" Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alistair Popple
2025-02-28 14:31:00 +11:00
committed by Andrew Morton
parent e6fa3963a3
commit d5b3afea22
6 changed files with 63 additions and 61 deletions
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27
fs/fuse/dax.c
View File

@@ -666,33 +666,12 @@ static void fuse_wait_dax_page(struct inode *inode)
filemap_invalidate_lock(inode->i_mapping);
}
/* Should be called with mapping->invalidate_lock held exclusively */
static int __fuse_dax_break_layouts(struct inode *inode, bool *retry,
loff_t start, loff_t end)
{
struct page *page;
page = dax_layout_busy_page_range(inode->i_mapping, start, end);
if (!page)
return 0;
*retry = true;
return dax_wait_page_idle(page, fuse_wait_dax_page, inode);
}
/* Should be called with mapping->invalidate_lock held exclusively. */
int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start,
u64 dmap_end)
{
bool retry;
int ret;
do {
retry = false;
ret = __fuse_dax_break_layouts(inode, &retry, dmap_start,
dmap_end);
} while (ret == 0 && retry);
return ret;
return dax_break_layout(inode, dmap_start, dmap_end,
fuse_wait_dax_page);
}
ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)