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authorSam Lang <sam.lang@inktank.com>2012-12-28 09:56:46 -0800
committerAlex Elder <elder@inktank.com>2013-01-17 12:42:36 -0600
commit6e8575faa8fa680d59404a4d58d12190667be815 (patch)
tree702820d6f2acc31fcb8a6efd18471d390a54e962 /fs/ceph
parent79aec9844de339531f05b019644ccaf5dd777144 (diff)
downloadlinux-stericsson-6e8575faa8fa680d59404a4d58d12190667be815.tar.gz
ceph: Check for created flag in response from mds
The mds now sends back a created inode if the create request performed the create. If the file already existed, no inode is returned in the reply. This allows ceph to set the created flag in atomic_open so that permissions are properly checked in the case that the file wasn't created by the create call to the mds. To ensure compability with previous kernels, a feature for sending back the inode in the create reply was added, so that the mds will only send back the inode if the client indicates it supports the feature. Signed-off-by: Sam Lang <sam.lang@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/file.c3
-rw-r--r--fs/ceph/mds_client.c33
-rw-r--r--fs/ceph/mds_client.h6
3 files changed, 40 insertions, 2 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 2c71cbd78332..22b5b71b5401 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -266,6 +266,9 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
err = finish_no_open(file, dn);
} else {
dout("atomic_open finish_open on dn %p\n", dn);
+ if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
+ *opened |= FILE_CREATED;
+ }
err = finish_open(file, dentry, ceph_open, opened);
}
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 9165eb8309eb..d95842036c8b 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -233,6 +233,30 @@ bad:
}
/*
+ * parse create results
+ */
+static int parse_reply_info_create(void **p, void *end,
+ struct ceph_mds_reply_info_parsed *info,
+ int features)
+{
+ if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
+ if (*p == end) {
+ info->has_create_ino = false;
+ } else {
+ info->has_create_ino = true;
+ info->ino = ceph_decode_64(p);
+ }
+ }
+
+ if (unlikely(*p != end))
+ goto bad;
+ return 0;
+
+bad:
+ return -EIO;
+}
+
+/*
* parse extra results
*/
static int parse_reply_info_extra(void **p, void *end,
@@ -241,8 +265,12 @@ static int parse_reply_info_extra(void **p, void *end,
{
if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
return parse_reply_info_filelock(p, end, info, features);
- else
+ else if (info->head->op == CEPH_MDS_OP_READDIR)
return parse_reply_info_dir(p, end, info, features);
+ else if (info->head->op == CEPH_MDS_OP_CREATE)
+ return parse_reply_info_create(p, end, info, features);
+ else
+ return -EIO;
}
/*
@@ -2170,7 +2198,8 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
mutex_lock(&req->r_fill_mutex);
err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
if (err == 0) {
- if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
+ if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
+ req->r_op == CEPH_MDS_OP_LSSNAP) &&
rinfo->dir_nr)
ceph_readdir_prepopulate(req, req->r_session);
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index dd26846dd71d..567f7c60354e 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -74,6 +74,12 @@ struct ceph_mds_reply_info_parsed {
struct ceph_mds_reply_info_in *dir_in;
u8 dir_complete, dir_end;
};
+
+ /* for create results */
+ struct {
+ bool has_create_ino;
+ u64 ino;
+ };
};
/* encoded blob describing snapshot contexts for certain