[lustre-devel] [PATCH 08/25] lustre: enc: make sure DoM files are correctly decrypted

[James Simmons]

From: Sebastien Buisson <sbuisson at ddn.com>

Make sure DoM files are decrypted upon read by loading their
associated encryption context, via fscrypt_prepare_readdir()/
fscrypt_get_encryption_info().

WC-bug-id: https://jira.whamcloud.com/browse/LU-16670
Lustre-commit: 1c424252d37c64e3c ("LU-16670 enc: make sure DoM files are correctly decrypted")
Signed-off-by: Sebastien Buisson <sbuisson at ddn.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50429
Reviewed-by: Andreas Dilger <adilger at whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell at whamcloud.com>
Reviewed-by: Mikhail Pershin <mpershin at whamcloud.com>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
 fs/lustre/llite/file.c  | 7 +++++--
 fs/lustre/llite/namei.c | 6 +-----
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/fs/lustre/llite/file.c b/fs/lustre/llite/file.c
index 9307007c3e18..d196362a40ca 100644
--- a/fs/lustre/llite/file.c
+++ b/fs/lustre/llite/file.c
@@ -453,14 +453,13 @@ static inline int ll_dom_readpage(void *data, struct page *page)
 	if (lnb->lnb_len < PAGE_SIZE)
 		memset(kaddr + lnb->lnb_len, 0,
 		       PAGE_SIZE - lnb->lnb_len);
-	flush_dcache_page(page);
-	SetPageUptodate(page);
 	kunmap_atomic(kaddr);
 
 	if (inode && IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode)) {
 		if (!fscrypt_has_encryption_key(inode)) {
 			CDEBUG(D_SEC, "no enc key for " DFID "\n",
 			       PFID(ll_inode2fid(inode)));
+			rc = -ENOKEY;
 		} else {
 			unsigned int offs = 0;
 
@@ -481,6 +480,10 @@ static inline int ll_dom_readpage(void *data, struct page *page)
 			}
 		}
 	}
+	if (!rc) {
+		flush_dcache_page(page);
+		SetPageUptodate(page);
+	}
 	unlock_page(page);
 
 	return rc;
diff --git a/fs/lustre/llite/namei.c b/fs/lustre/llite/namei.c
index a19e5f707027..920b592489ab 100644
--- a/fs/lustre/llite/namei.c
+++ b/fs/lustre/llite/namei.c
@@ -735,10 +735,6 @@ static int ll_lookup_it_finish(struct ptlrpc_request *request,
 			rc = fscrypt_get_encryption_info(inode);
 			if (rc)
 				goto out;
-			if (!fscrypt_has_encryption_key(inode)) {
-				rc = -ENOKEY;
-				goto out;
-			}
 		}
 	} else if (!it_disposition(it, DISP_OPEN_CREATE)) {
 		/*
@@ -1204,6 +1200,7 @@ static int ll_atomic_open(struct inode *dir, struct dentry *dentry,
 		rc = fscrypt_get_encryption_info(dir);
 		if (rc)
 			goto out_release;
+		encrypt = true;
 		if (open_flags & O_CREAT) {
 			/* For migration or mirroring without enc key, we still
 			 * need to be able to create a volatile file.
@@ -1216,7 +1213,6 @@ static int ll_atomic_open(struct inode *dir, struct dentry *dentry,
 				rc = -ENOKEY;
 				goto out_release;
 			}
-			encrypt = true;
 		}
 	}
 
-- 
2.39.3