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authorNeilBrown <neilb@suse.de>2015-05-08 10:16:23 +1000
committerChris Mason <clm@fb.com>2015-10-06 06:55:23 -0700
commit7d35199e15b82a4d1a20049153b03e6258ce79f7 (patch)
tree285948462f1025eba99217bbb979399f414b41d5
parente5fffbac4a49270e4976d71a0e054c0cf3ef4f8e (diff)
downloadlinux-7d35199e15b82a4d1a20049153b03e6258ce79f7.tar.bz2
BTRFS: support NFSv2 export
The "fh_len" passed to ->fh_to_* is not guaranteed to be that same as that returned by encode_fh - it may be larger. With NFSv2, the filehandle is fixed length, so it may appear longer than expected and be zero-padded. So we must test that fh_len is at least some value, not exactly equal to it. Signed-off-by: NeilBrown <neilb@suse.de> Acked-by: David Sterba <dsterba@suse.cz>
-rw-r--r--fs/btrfs/export.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 8d052209f473..2513a7f53334 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -112,11 +112,11 @@ static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh,
u32 generation;
if (fh_type == FILEID_BTRFS_WITH_PARENT) {
- if (fh_len != BTRFS_FID_SIZE_CONNECTABLE)
+ if (fh_len < BTRFS_FID_SIZE_CONNECTABLE)
return NULL;
root_objectid = fid->root_objectid;
} else if (fh_type == FILEID_BTRFS_WITH_PARENT_ROOT) {
- if (fh_len != BTRFS_FID_SIZE_CONNECTABLE_ROOT)
+ if (fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT)
return NULL;
root_objectid = fid->parent_root_objectid;
} else
@@ -136,11 +136,11 @@ static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
u32 generation;
if ((fh_type != FILEID_BTRFS_WITH_PARENT ||
- fh_len != BTRFS_FID_SIZE_CONNECTABLE) &&
+ fh_len < BTRFS_FID_SIZE_CONNECTABLE) &&
(fh_type != FILEID_BTRFS_WITH_PARENT_ROOT ||
- fh_len != BTRFS_FID_SIZE_CONNECTABLE_ROOT) &&
+ fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT) &&
(fh_type != FILEID_BTRFS_WITHOUT_PARENT ||
- fh_len != BTRFS_FID_SIZE_NON_CONNECTABLE))
+ fh_len < BTRFS_FID_SIZE_NON_CONNECTABLE))
return NULL;
objectid = fid->objectid;