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ovl: fix wrong detection of 32bit inode numbers 

The implicit FILEID_INO32_GEN encoder was changed to be explicit,
so we need to fix the detection.

When mounting overlayfs with upperdir and lowerdir on different ext4
filesystems, the expected kmsg log is:

  overlayfs: "xino" feature enabled using 32 upper inode bits.

But instead, since the regressing commit, the kmsg log was:

  overlayfs: "xino" feature enabled using 2 upper inode bits.

Fixes: e21fc2038c ("exportfs: make ->encode_fh() a mandatory method for NFS export")
Cc: stable@vger.kernel.org # v6.7+
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Amir Goldstein 2026-03-08 12:02:21 +01:00
parent f338e77383
commit 53a7c171e9
1 changed files with 4 additions and 1 deletions
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5
fs/overlayfs/util.c
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@ -85,7 +85,10 @@ int ovl_can_decode_fh(struct super_block *sb)
if (!exportfs_can_decode_fh(sb->s_export_op))
return 0;
return sb->s_export_op->encode_fh ? -1 : FILEID_INO32_GEN;
if (sb->s_export_op->encode_fh == generic_encode_ino32_fh)
return FILEID_INO32_GEN;
return -1;
}
struct dentry *ovl_indexdir(struct super_block *sb)