[PATCH v13 41/59] ceph: get file size from fscrypt_file when present in inode traces

Jeff Layton
2022-04-06T01:54:12Z

When we get an inode trace from the MDS, grab the fscrypt_file field if
the inode is encrypted, and use it to populate the i_size field instead
of the regular inode size field.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/ceph/inode.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index b9454721c976..f2a59306e4a6 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1024,6 +1024,7 @@ int ceph_fill_inode(struct inode *inode, struct page *locked_page,

if (new_version ||
(new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
+ u64 size = le64_to_cpu(info->size);
s64 old_pool = ci->i_layout.pool_id;
struct ceph_string *old_ns;

@@ -1037,10 +1038,21 @@ int ceph_fill_inode(struct inode *inode, struct page *locked_page,

pool_ns = old_ns;

+ if (IS_ENCRYPTED(inode) && size && (iinfo->fscrypt_file_len == sizeof(__le64))) {
+ u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
+
+ if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
+ size = fsize;
+ } else {
+ pr_warn("fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
+ info->size, size);
+ }
+ }
+
queue_trunc = ceph_fill_file_size(inode, issued,
- le32_to_cpu(info->truncate_seq),
- le64_to_cpu(info->truncate_size),
- le64_to_cpu(info->size));
+ le32_to_cpu(info->truncate_seq),
+ le64_to_cpu(info->truncate_size),
+ size);
/* only update max_size on auth cap */
if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
ci->i_max_size != le64_to_cpu(info->max_size)) {
--
2.35.1