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authorJeff Layton <jlayton@kernel.org>2019-04-15 12:00:42 -0400
committerIlya Dryomov <idryomov@gmail.com>2019-04-23 21:37:54 +0200
commit1bcb344086f3ecf8d6705f6d708441baa823beb3 (patch)
treea74e633044deef292484f263c6ecba10e794d40d /fs
parent085b7755808aa11f78ab9377257e1dad2e6fa4bb (diff)
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ceph: only use d_name directly when parent is locked
Ben reported tripping the BUG_ON in create_request_message during some performance testing. Analysis of the vmcore showed that the length of the r_dentry->d_name string changed after we allocated the buffer, but before we encoded it. build_dentry_path returns pointers to d_name in the common case of non-snapped dentries, but this optimization isn't safe unless the parent directory is locked. When it isn't, have the code make a copy of the d_name while holding the d_lock. Cc: stable@vger.kernel.org Reported-by: Ben England <bengland@redhat.com> Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ceph/mds_client.c61
1 files changed, 50 insertions, 11 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 21c33ed048ed..bc5d70d6bfe6 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2161,10 +2161,39 @@ retry:
return path;
}
+/* Duplicate the dentry->d_name.name safely */
+static int clone_dentry_name(struct dentry *dentry, const char **ppath,
+ int *ppathlen)
+{
+ u32 len;
+ char *name;
+
+retry:
+ len = READ_ONCE(dentry->d_name.len);
+ name = kmalloc(len + 1, GFP_NOFS);
+ if (!name)
+ return -ENOMEM;
+
+ spin_lock(&dentry->d_lock);
+ if (dentry->d_name.len != len) {
+ spin_unlock(&dentry->d_lock);
+ kfree(name);
+ goto retry;
+ }
+ memcpy(name, dentry->d_name.name, len);
+ spin_unlock(&dentry->d_lock);
+
+ name[len] = '\0';
+ *ppath = name;
+ *ppathlen = len;
+ return 0;
+}
+
static int build_dentry_path(struct dentry *dentry, struct inode *dir,
const char **ppath, int *ppathlen, u64 *pino,
- int *pfreepath)
+ bool *pfreepath, bool parent_locked)
{
+ int ret;
char *path;
rcu_read_lock();
@@ -2173,8 +2202,15 @@ static int build_dentry_path(struct dentry *dentry, struct inode *dir,
if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
*pino = ceph_ino(dir);
rcu_read_unlock();
- *ppath = dentry->d_name.name;
- *ppathlen = dentry->d_name.len;
+ if (parent_locked) {
+ *ppath = dentry->d_name.name;
+ *ppathlen = dentry->d_name.len;
+ } else {
+ ret = clone_dentry_name(dentry, ppath, ppathlen);
+ if (ret)
+ return ret;
+ *pfreepath = true;
+ }
return 0;
}
rcu_read_unlock();
@@ -2182,13 +2218,13 @@ static int build_dentry_path(struct dentry *dentry, struct inode *dir,
if (IS_ERR(path))
return PTR_ERR(path);
*ppath = path;
- *pfreepath = 1;
+ *pfreepath = true;
return 0;
}
static int build_inode_path(struct inode *inode,
const char **ppath, int *ppathlen, u64 *pino,
- int *pfreepath)
+ bool *pfreepath)
{
struct dentry *dentry;
char *path;
@@ -2204,7 +2240,7 @@ static int build_inode_path(struct inode *inode,
if (IS_ERR(path))
return PTR_ERR(path);
*ppath = path;
- *pfreepath = 1;
+ *pfreepath = true;
return 0;
}
@@ -2215,7 +2251,7 @@ static int build_inode_path(struct inode *inode,
static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
struct inode *rdiri, const char *rpath,
u64 rino, const char **ppath, int *pathlen,
- u64 *ino, int *freepath)
+ u64 *ino, bool *freepath, bool parent_locked)
{
int r = 0;
@@ -2225,7 +2261,7 @@ static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
ceph_snap(rinode));
} else if (rdentry) {
r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
- freepath);
+ freepath, parent_locked);
dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
*ppath);
} else if (rpath || rino) {
@@ -2251,7 +2287,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
const char *path2 = NULL;
u64 ino1 = 0, ino2 = 0;
int pathlen1 = 0, pathlen2 = 0;
- int freepath1 = 0, freepath2 = 0;
+ bool freepath1 = false, freepath2 = false;
int len;
u16 releases;
void *p, *end;
@@ -2259,16 +2295,19 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
ret = set_request_path_attr(req->r_inode, req->r_dentry,
req->r_parent, req->r_path1, req->r_ino1.ino,
- &path1, &pathlen1, &ino1, &freepath1);
+ &path1, &pathlen1, &ino1, &freepath1,
+ test_bit(CEPH_MDS_R_PARENT_LOCKED,
+ &req->r_req_flags));
if (ret < 0) {
msg = ERR_PTR(ret);
goto out;
}
+ /* If r_old_dentry is set, then assume that its parent is locked */
ret = set_request_path_attr(NULL, req->r_old_dentry,
req->r_old_dentry_dir,
req->r_path2, req->r_ino2.ino,
- &path2, &pathlen2, &ino2, &freepath2);
+ &path2, &pathlen2, &ino2, &freepath2, true);
if (ret < 0) {
msg = ERR_PTR(ret);
goto out_free1;