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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2020-12-19 15:19:23 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-01-20 14:46:04 +0000 |
| commit | f9ce0be71d1fbb038ada15ced83474b0e63f264d (patch) | |
| tree | 81ea4f17081eac47606246a4ba96a43cd8db00c9 /fs/xfs | |
| parent | 19c329f6808995b142b3966301f217c831e7cf31 (diff) | |
| download | linux-stable-f9ce0be71d1fbb038ada15ced83474b0e63f264d.tar.gz linux-stable-f9ce0be71d1fbb038ada15ced83474b0e63f264d.tar.bz2 linux-stable-f9ce0be71d1fbb038ada15ced83474b0e63f264d.zip | |
mm: Cleanup faultaround and finish_fault() codepaths
alloc_set_pte() has two users with different requirements: in the
faultaround code, it called from an atomic context and PTE page table
has to be preallocated. finish_fault() can sleep and allocate page table
as needed.
PTL locking rules are also strange, hard to follow and overkill for
finish_fault().
Let's untangle the mess. alloc_set_pte() has gone now. All locking is
explicit.
The price is some code duplication to handle huge pages in faultaround
path, but it should be fine, having overall improvement in readability.
Link: https://lore.kernel.org/r/20201229132819.najtavneutnf7ajp@box
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[will: s/from from/from/ in comment; spotted by willy]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/xfs_file.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 5b0f93f73837..111fe73bb8a7 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1319,17 +1319,19 @@ xfs_filemap_pfn_mkwrite( return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true); } -static void +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); - filemap_map_pages(vmf, start_pgoff, end_pgoff); + 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 = { |