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Code Issues Releases Wiki Activity

ksmbd: send v2 lease break notification for directory

Browse source 
If client send different parent key, different client guid, or there is
no parent lease key flags in create context v2 lease, ksmbd send lease
break to client.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2023-12-08 14:33:41 +09:00 committed by Steve French
parent eb547407f3
commit d47d9886ae
6 changed files with 77 additions and 6 deletions
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1
fs/smb/common/smb2pdu.h
View file

@ -1253,6 +1253,7 @@ struct create_mxac_rsp {
#define SMB2_LEASE_WRITE_CACHING_LE cpu_to_le32(0x04)
#define SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE cpu_to_le32(0x02)
#define SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE cpu_to_le32(0x04)
#define SMB2_LEASE_KEY_SIZE 16

56
fs/smb/server/oplock.c
View file

@ -102,6 +102,7 @@ static int alloc_lease(struct oplock_info *opinfo, struct lease_ctx_info *lctx)
lease->new_state = 0;
lease->flags = lctx->flags;
lease->duration = lctx->duration;
lease->is_dir = lctx->is_dir;
memcpy(lease->parent_lease_key, lctx->parent_lease_key, SMB2_LEASE_KEY_SIZE);
lease->version = lctx->version;
lease->epoch = le16_to_cpu(lctx->epoch);
@ -543,12 +544,13 @@ static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci,
/* upgrading lease */
if ((atomic_read(&ci->op_count) +
atomic_read(&ci->sop_count)) == 1) {
if (lease->state ==
(lctx->req_state & lease->state)) {
if (lease->state != SMB2_LEASE_NONE_LE &&
lease->state == (lctx->req_state & lease->state)) {
lease->state |= lctx->req_state;
if (lctx->req_state &
SMB2_LEASE_WRITE_CACHING_LE)
lease_read_to_write(opinfo);
}
} else if ((atomic_read(&ci->op_count) +
atomic_read(&ci->sop_count)) > 1) {
@ -900,7 +902,8 @@ static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level)
lease->new_state =
SMB2_LEASE_READ_CACHING_LE;
} else {
if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE &&
!lease->is_dir)
lease->new_state =
SMB2_LEASE_READ_CACHING_LE;
else
@ -1082,6 +1085,48 @@ static void set_oplock_level(struct oplock_info *opinfo, int level,
}
}
void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
struct lease_ctx_info *lctx)
{
struct oplock_info *opinfo;
struct ksmbd_inode *p_ci = NULL;
if (lctx->version != 2)
return;
p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);
if (!p_ci)
return;
read_lock(&p_ci->m_lock);
list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) {
if (!opinfo->is_lease)
continue;
if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE &&
(!(lctx->flags & SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE) ||
!compare_guid_key(opinfo, fp->conn->ClientGUID,
lctx->parent_lease_key))) {
if (!atomic_inc_not_zero(&opinfo->refcount))
continue;
atomic_inc(&opinfo->conn->r_count);
if (ksmbd_conn_releasing(opinfo->conn)) {
atomic_dec(&opinfo->conn->r_count);
continue;
}
read_unlock(&p_ci->m_lock);
oplock_break(opinfo, SMB2_OPLOCK_LEVEL_NONE);
opinfo_conn_put(opinfo);
read_lock(&p_ci->m_lock);
}
}
read_unlock(&p_ci->m_lock);
ksmbd_inode_put(p_ci);
}
/**
* smb_grant_oplock() - handle oplock/lease request on file open
* @work: smb work
@ -1420,10 +1465,11 @@ struct lease_ctx_info *parse_lease_state(void *open_req, bool is_dir)
struct create_lease_v2 *lc = (struct create_lease_v2 *)cc;
memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
if (is_dir)
if (is_dir) {
lreq->req_state = lc->lcontext.LeaseState &
~SMB2_LEASE_WRITE_CACHING_LE;
else
lreq->is_dir = true;
} else
lreq->req_state = lc->lcontext.LeaseState;
lreq->flags = lc->lcontext.LeaseFlags;
lreq->epoch = lc->lcontext.Epoch;

4
fs/smb/server/oplock.h
View file

@ -36,6 +36,7 @@ struct lease_ctx_info {
__u8 parent_lease_key[SMB2_LEASE_KEY_SIZE];
__le16 epoch;
int version;
bool is_dir;
};
struct lease_table {
@ -54,6 +55,7 @@ struct lease {
__u8 parent_lease_key[SMB2_LEASE_KEY_SIZE];
int version;
unsigned short epoch;
bool is_dir;
struct lease_table *l_lb;
};
@ -125,4 +127,6 @@ struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci,
struct lease_ctx_info *lctx);
void destroy_lease_table(struct ksmbd_conn *conn);
void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
struct lease_ctx_info *lctx);
#endif /* __KSMBD_OPLOCK_H */

7
fs/smb/server/smb2pdu.c
View file

@ -3225,6 +3225,13 @@ int smb2_open(struct ksmbd_work *work)
}
} else {
if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) {
/*
* Compare parent lease using parent key. If there is no
* a lease that has same parent key, Send lease break
* notification.
*/
smb_send_parent_lease_break_noti(fp, lc);
req_op_level = smb2_map_lease_to_oplock(lc->req_state);
ksmbd_debug(SMB,
"lease req for(%s) req oplock state 0x%x, lease state 0x%x\n",

13
fs/smb/server/vfs_cache.c
View file

@ -87,6 +87,17 @@ static struct ksmbd_inode *ksmbd_inode_lookup(struct ksmbd_file *fp)
return __ksmbd_inode_lookup(fp->filp->f_path.dentry);
}
struct ksmbd_inode *ksmbd_inode_lookup_lock(struct dentry *d)
{
struct ksmbd_inode *ci;
read_lock(&inode_hash_lock);
ci = __ksmbd_inode_lookup(d);
read_unlock(&inode_hash_lock);
return ci;
}
int ksmbd_query_inode_status(struct dentry *dentry)
{
struct ksmbd_inode *ci;
@ -199,7 +210,7 @@ static void ksmbd_inode_free(struct ksmbd_inode *ci)
kfree(ci);
}
static void ksmbd_inode_put(struct ksmbd_inode *ci)
void ksmbd_inode_put(struct ksmbd_inode *ci)
{
if (atomic_dec_and_test(&ci->m_count))
ksmbd_inode_free(ci);

2
fs/smb/server/vfs_cache.h
View file

@ -138,6 +138,8 @@ struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, u64 id);
struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id,
u64 pid);
void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp);
struct ksmbd_inode *ksmbd_inode_lookup_lock(struct dentry *d);
void ksmbd_inode_put(struct ksmbd_inode *ci);
struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id);
struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid);
struct ksmbd_file *ksmbd_lookup_fd_inode(struct dentry *dentry);