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ovl: respect FIEMAP_FLAG_SYNC flag

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Stacked overlayfs fiemap operation broke xfstests that test delayed
allocation (with "_test_generic_punch -d"), because ovl_fiemap()
failed to write dirty pages when requested.

Fixes: 9e142c4102 ("ovl: add ovl_fiemap()")
Signed-off-by: Amir Goldstein <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
This commit is contained in:
Amir Goldstein authored and Miklos Szeredi committed 2018-08-30 17:08:35 +02:00
1 parent 5b394b2ddf
commit 80d3481081
1 file changed
+4
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fs/overlayfs/inode.c
+4
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@@ -467,6 +467,10 @@ static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
return -EOPNOTSUPP;
old_cred = ovl_override_creds(inode->i_sb);
if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
filemap_write_and_wait(realinode->i_mapping);
err = realinode->i_op->fiemap(realinode, fieinfo, start, len);
revert_creds(old_cred);