CIFS: Process oplocks for SMB2
Pavel Shilovsky [Tue, 18 Sep 2012 23:20:33 +0000 (16:20 -0700)]
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/cifsglob.h
fs/cifs/connect.c
fs/cifs/smb2file.c
fs/cifs/smb2inode.c
fs/cifs/smb2ops.c
fs/cifs/smb2pdu.c
fs/cifs/smb2proto.h

index 9adf211..3eb59ed 100644 (file)
@@ -328,6 +328,8 @@ struct smb_version_operations {
                         struct cifs_fid *);
        /* calculate a size of SMB message */
        unsigned int (*calc_smb_size)(void *);
+       /* check for STATUS_PENDING and process it in a positive case */
+       bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
 };
 
 struct smb_version_values {
index c31b30b..549409b 100644 (file)
@@ -819,6 +819,10 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
                cifs_dump_mem("Bad SMB: ", buf,
                        min_t(unsigned int, server->total_read, 48));
 
+       if (server->ops->is_status_pending &&
+           server->ops->is_status_pending(buf, server, length))
+               return -1;
+
        if (!mid)
                return length;
 
index a7618df..5ff25e0 100644 (file)
 #include "fscache.h"
 #include "smb2proto.h"
 
+void
+smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
+{
+       oplock &= 0xFF;
+       if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
+               cinode->clientCanCacheAll = true;
+               cinode->clientCanCacheRead = true;
+               cFYI(1, "Exclusive Oplock granted on inode %p",
+                    &cinode->vfs_inode);
+       } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
+               cinode->clientCanCacheAll = false;
+               cinode->clientCanCacheRead = true;
+               cFYI(1, "Level II Oplock granted on inode %p",
+                   &cinode->vfs_inode);
+       } else {
+               cinode->clientCanCacheAll = false;
+               cinode->clientCanCacheRead = false;
+       }
+}
+
 int
 smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
               int disposition, int desired_access, int create_options,
@@ -58,10 +78,11 @@ smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
        }
 
        desired_access |= FILE_READ_ATTRIBUTES;
+       *oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
 
        rc = SMB2_open(xid, tcon, smb2_path, &fid->persistent_fid,
                       &fid->volatile_fid, desired_access, disposition,
-                      0, 0, smb2_data);
+                      0, 0, (__u8 *)oplock, smb2_data);
        if (rc)
                goto out;
 
@@ -79,7 +100,6 @@ smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
        }
 
 out:
-       *oplock = 0;
        kfree(smb2_data);
        kfree(smb2_path);
        return rc;
index 1bd6b0f..7064824 100644 (file)
@@ -47,6 +47,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
        int rc, tmprc = 0;
        u64 persistent_fid, volatile_fid;
        __le16 *utf16_path;
+       __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 
        utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
        if (!utf16_path)
@@ -54,7 +55,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
 
        rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
                       desired_access, create_disposition, file_attributes,
-                      create_options, NULL);
+                      create_options, &oplock, NULL);
        if (rc) {
                kfree(utf16_path);
                return rc;
index 0fa086c..2d88c90 100644 (file)
@@ -23,6 +23,7 @@
 #include "smb2proto.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
+#include "smb2status.h"
 
 static int
 change_conf(struct TCP_Server_Info *server)
@@ -207,13 +208,14 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
        int rc;
        __u64 persistent_fid, volatile_fid;
        __le16 *utf16_path;
+       __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 
        utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
        if (!utf16_path)
                return -ENOMEM;
 
        rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
-                      FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, NULL);
+                      FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, &oplock, NULL);
        if (rc) {
                kfree(utf16_path);
                return rc;
@@ -358,10 +360,10 @@ smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 static void
 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 {
-       /* struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); */
+       struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
        cfile->fid.persistent_fid = fid->persistent_fid;
        cfile->fid.volatile_fid = fid->volatile_fid;
-       /* cifs_set_oplock_level(cinode, oplock); */
+       smb2_set_oplock_level(cinode, oplock);
        /* cinode->can_cache_brlcks = cinode->clientCanCacheAll; */
 }
 
@@ -432,6 +434,7 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 {
        __le16 *utf16_path;
        int rc;
+       __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        __u64 persistent_fid, volatile_fid;
 
        utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
@@ -440,7 +443,7 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 
        rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
                       FILE_READ_ATTRIBUTES | FILE_READ_DATA, FILE_OPEN, 0, 0,
-                      NULL);
+                      &oplock, NULL);
        kfree(utf16_path);
        if (rc) {
                cERROR(1, "open dir failed");
@@ -477,6 +480,28 @@ smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
        return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 }
 
+/*
+* If we negotiate SMB2 protocol and get STATUS_PENDING - update
+* the number of credits and return true. Otherwise - return false.
+*/
+static bool
+smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
+{
+       struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
+
+       if (le32_to_cpu(hdr->Status) != STATUS_PENDING)
+               return false;
+
+       if (!length) {
+               spin_lock(&server->req_lock);
+               server->credits += le16_to_cpu(hdr->CreditRequest);
+               spin_unlock(&server->req_lock);
+               wake_up(&server->request_q);
+       }
+
+       return true;
+}
+
 struct smb_version_operations smb21_operations = {
        .setup_request = smb2_setup_request,
        .setup_async_request = smb2_setup_async_request,
@@ -530,6 +555,7 @@ struct smb_version_operations smb21_operations = {
        .query_dir_next = smb2_query_dir_next,
        .close_dir = smb2_close_dir,
        .calc_smb_size = smb2_calc_size,
+       .is_status_pending = smb2_is_status_pending,
 };
 
 struct smb_version_values smb21_values = {
index 21b3a65..e97c256 100644 (file)
@@ -872,7 +872,7 @@ int
 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
          u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
          __u32 create_disposition, __u32 file_attributes, __u32 create_options,
-         struct smb2_file_all_info *buf)
+         __u8 *oplock, struct smb2_file_all_info *buf)
 {
        struct smb2_create_req *req;
        struct smb2_create_rsp *rsp;
@@ -895,9 +895,9 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
        if (rc)
                return rc;
 
-       /* if (server->oplocks)
-               req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH;
-       else */
+       if (server->oplocks)
+               req->RequestedOplockLevel = *oplock;
+       else
                req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
        req->ImpersonationLevel = IL_IMPERSONATION;
        req->DesiredAccess = cpu_to_le32(desired_access);
@@ -954,6 +954,8 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
                buf->NumberOfLinks = cpu_to_le32(1);
                buf->DeletePending = 0;
        }
+
+       *oplock = rsp->OplockLevel;
 creat_exit:
        free_rsp_buf(resp_buftype, rsp);
        return rc;
index 0d29db2..d18339f 100644 (file)
@@ -82,6 +82,7 @@ extern int smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon,
                          int desired_access, int create_options,
                          struct cifs_fid *fid, __u32 *oplock,
                          FILE_ALL_INFO *buf, struct cifs_sb_info *cifs_sb);
+extern void smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock);
 
 /*
  * SMB2 Worker functions - most of protocol specific implementation details
@@ -99,7 +100,7 @@ extern int SMB2_open(const unsigned int xid, struct cifs_tcon *tcon,
                     __le16 *path, u64 *persistent_fid, u64 *volatile_fid,
                     __u32 desired_access, __u32 create_disposition,
                     __u32 file_attributes, __u32 create_options,
-                    struct smb2_file_all_info *buf);
+                    __u8 *oplock, struct smb2_file_all_info *buf);
 extern int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
                      u64 persistent_file_id, u64 volatile_file_id);
 extern int SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon,