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authorDave Chinner <dchinner@redhat.com>2015-06-04 09:18:18 +1000
committerDave Chinner <david@fromorbit.com>2015-06-04 09:18:18 +1000
commitec56b1f1fdc69599963574ce94cc5693d535dd64 (patch)
treef24257a8fc533d11218caf0f4653cf30fa024d71 /fs/xfs
parent5ebe6afaf0057ac3eaeb98defd5456894b446d22 (diff)
xfs: mmap lock needs to be inside freeze protection
Lock ordering for the new mmap lock needs to be: mmap_sem sb_start_pagefault i_mmap_lock page lock <fault processsing> Right now xfs_vm_page_mkwrite gets this the wrong way around, While technically it cannot deadlock due to the current freeze ordering, it's still a landmine that might explode if we change anything in future. Hence we need to nest the locks correctly. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_file.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 8121e75352ee..0b4e79fd8d05 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1487,15 +1487,20 @@ xfs_filemap_page_mkwrite(
struct vm_fault *vmf)
{
struct xfs_inode *ip = XFS_I(vma->vm_file->f_mapping->host);
- int error;
+ int ret;
trace_xfs_filemap_page_mkwrite(ip);
+ sb_start_pagefault(VFS_I(ip)->i_sb);
+ file_update_time(vma->vm_file);
xfs_ilock(ip, XFS_MMAPLOCK_SHARED);
- error = block_page_mkwrite(vma, vmf, xfs_get_blocks);
+
+ ret = __block_page_mkwrite(vma, vmf, xfs_get_blocks);
+
xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
+ sb_end_pagefault(VFS_I(ip)->i_sb);
- return error;
+ return block_page_mkwrite_return(ret);
}
const struct file_operations xfs_file_operations = {