When the flag not supported is specified, it is necessary to return the error
to the caller.
So, we add the validity check of the fiemap's flag.
Signed-off-by: Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx>
---
fs/btrfs/inode.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5fc0990..1e09991 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6582,9 +6582,17 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
btrfs_submit_direct, 0);
}
+#define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
+
static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
{
+ int ret;
+
+ ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS);
+ if (ret)
+ return ret;
+
return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap);
}
--
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