On 2/25/22 5:48 PM, Luís Henriques wrote:
Xiubo Li <xiubli@xxxxxxxxxx> writes:
On 2/24/22 7:21 PM, Luís Henriques wrote:
Since filenames in encrypted directories are already encrypted and shown
as a base64-encoded string when the directory is locked, snapshot names
should show a similar behaviour.
Signed-off-by: Luís Henriques <lhenriques@xxxxxxx>
---
fs/ceph/dir.c | 15 +++++++++++++++
fs/ceph/inode.c | 10 +++++++++-
2 files changed, 24 insertions(+), 1 deletion(-)
Support on the MDS for names that'll be > MAX_NAME when base64 encoded is
still TBD. I thought it would be something easy to do, but snapshots
don't seem to make use of the CDir/CDentry (which is where alternate_name
is stored on the MDS). I'm still looking into this, but I may need some
help there :-(
Cheers,
--
Luís
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index a449f4a07c07..20ae600ee7cd 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1065,6 +1065,13 @@ static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
op = CEPH_MDS_OP_MKSNAP;
dout("mksnap dir %p snap '%pd' dn %p\n", dir,
dentry, dentry);
+ /* XXX missing support for alternate_name in snapshots */
+ if (IS_ENCRYPTED(dir) && (dentry->d_name.len >= 189)) {
+ dout("encrypted snapshot name too long: %pd len: %d\n",
+ dentry, dentry->d_name.len);
+ err = -ENAMETOOLONG;
+ goto out;
+ }
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
op = CEPH_MDS_OP_MKDIR;
@@ -1109,6 +1116,14 @@ static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
!req->r_reply_info.head->is_target &&
!req->r_reply_info.head->is_dentry)
err = ceph_handle_notrace_create(dir, dentry);
+
+ /*
+ * If we have created a snapshot we need to clear the cache, otherwise
+ * snapshot will show encrypted filenames in readdir.
+ */
Do you mean dencrypted filenames ?
What I see without this d_drop() is that, if I run an 'ls' in a snapshot
directory immediately after creating it, the filenames in that snapshot
will be encrypted. Maybe there's a bug somewhere else and this d_drop()
isn't the right fix...?
Maybe should fix this in ceph_fill_trace() in
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||... {
}
?
I still haven't gotten where will encrypt it yet in mksnap case. Because
the MDS will set the 'rinfo->head->is_target' but won't set the
'rinfo->head->is_dentry', so in this case the dentry should keep the
human readable name.
- Xiubo
Cheers,
