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authorMatthew Wilcox (Oracle) <willy@infradead.org>2023-03-27 18:45:13 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-04-05 19:42:59 -0700
commit945ea457b5a57cd34cbacce6f1f9e4a2e88432c2 (patch)
tree50741eb99e2ae209e8aac2265b0f8eb7ad24cb4d /fs
parent02cd4eb81c14ee64b062383c7e25fd8599b18f3d (diff)
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xfs: remove xfs_filemap_map_pages() wrapper
Patch series "Prevent ->map_pages from sleeping", v2. In preparation for a larger patch series which will handle (some, easy) page faults protected only by RCU, change the two filesystems which have sleeping locks to not take them and hold the RCU lock around calls to ->map_page to prevent other filesystems from adding sleeping locks. This patch (of 3): XFS doesn't actually need to be holding the XFS_MMAPLOCK_SHARED to do this. filemap_map_pages() cannot bring new folios into the page cache and the folio lock is taken during filemap_map_pages() which provides sufficient protection against a truncation or hole punch. Link: https://lkml.kernel.org/r/20230327174515.1811532-1-willy@infradead.org Link: https://lkml.kernel.org/r/20230327174515.1811532-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Cc: Darrick J. Wong <djwong@kernel.org> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/xfs_file.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 705250f9f90a..528fc538b6b9 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1388,25 +1388,10 @@ xfs_filemap_pfn_mkwrite(
return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
}
-static vm_fault_t
-xfs_filemap_map_pages(
- struct vm_fault *vmf,
- pgoff_t start_pgoff,
- pgoff_t end_pgoff)
-{
- struct inode *inode = file_inode(vmf->vma->vm_file);
- vm_fault_t ret;
-
- xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
- ret = filemap_map_pages(vmf, start_pgoff, end_pgoff);
- xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
- return ret;
-}
-
static const struct vm_operations_struct xfs_file_vm_ops = {
.fault = xfs_filemap_fault,
.huge_fault = xfs_filemap_huge_fault,
- .map_pages = xfs_filemap_map_pages,
+ .map_pages = filemap_map_pages,
.page_mkwrite = xfs_filemap_page_mkwrite,
.pfn_mkwrite = xfs_filemap_pfn_mkwrite,
};