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ceph: prepopulate inodes only when request is aborted

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If r_aborted is true, we do not hold the dir i_mutex, and cannot touch
the dcache.  However, we still need to update the inodes with the state
returned by the MDS.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sage Weil <sage@inktank.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Sage Weil 2013-01-29 02:55:31 -05:00 committed by Al Viro
parent 4f522a247b
commit 79f9f99ad1
1 changed files with 38 additions and 2 deletions
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40
fs/ceph/inode.c
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@ -1130,8 +1130,8 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
req->r_request_started);
dout(" final dn %p\n", dn);
i++;
} else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP) {
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
struct dentry *dn = req->r_dentry;
/* fill out a snapdir LOOKUPSNAP dentry */
@ -1195,6 +1195,39 @@ done:
/*
* Prepopulate our cache with readdir results, leases, etc.
*/
static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
struct ceph_mds_session *session)
{
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
int i, err = 0;
for (i = 0; i < rinfo->dir_nr; i++) {
struct ceph_vino vino;
struct inode *in;
int rc;
vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
in = ceph_get_inode(req->r_dentry->d_sb, vino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
dout("new_inode badness got %d\n", err);
continue;
}
rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
req->r_request_started, -1,
&req->r_caps_reservation);
if (rc < 0) {
pr_err("fill_inode badness on %p got %d\n", in, rc);
err = rc;
continue;
}
}
return err;
}
int ceph_readdir_prepopulate(struct ceph_mds_request *req,
struct ceph_mds_session *session)
{
@ -1209,6 +1242,9 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
u64 frag = le32_to_cpu(rhead->args.readdir.frag);
struct ceph_dentry_info *di;
if (req->r_aborted)
return readdir_prepopulate_inodes_only(req, session);
if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
snapdir = ceph_get_snapdir(parent->d_inode);
parent = d_find_alias(snapdir);