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ovl: check if all layers are on the same fs

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Some features can only work when all layers are on the same fs.  Test this
condition during mount time, so features can check them later.

Add helper ovl_same_sb() to return the common super block in case all
layers are on the same fs.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-03-22 08:42:21 -04:00
committed by Miklos Szeredi
parent 4a99f3c83d
commit 7bcd74b98d
4 changed files with 18 additions and 0 deletions
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2
fs/overlayfs/ovl_entry.h
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@@ -29,6 +29,8 @@ struct ovl_fs {
const struct cred *creator_cred;
bool tmpfile;
wait_queue_head_t copyup_wq;
/* sb common to all layers */
struct super_block *same_sb;
};
/* private information held for every overlayfs dentry */