cifs: Refactor out cifs_mount()
* Split and refactor the very large function cifs_mount() in multiple functions: - tcp, ses and tcon setup to mount_get_conns() - tcp, ses and tcon cleanup in mount_put_conns() - tcon tlink setup to mount_setup_tlink() - remote path checking to is_path_remote() * Implement 2 version of cifs_mount() for DFS-enabled builds and non-DFS-enabled builds (CONFIG_CIFS_DFS_UPCALL). In preparation for DFS failover support. Signed-off-by: Paulo Alcantara <palcantara@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara
Steve French
parent
9a596f5b39
commit
56c762eb9b
2 changed files with 272 additions and 193 deletions
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@ -213,7 +213,7 @@ extern int cifs_match_super(struct super_block *, void *);
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extern void cifs_cleanup_volume_info(struct smb_vol *pvolume_info);
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extern struct smb_vol *cifs_get_volume_info(char *mount_data,
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const char *devname, bool is_smb3);
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extern int cifs_mount(struct cifs_sb_info *, struct smb_vol *);
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extern int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol);
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extern void cifs_umount(struct cifs_sb_info *);
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extern void cifs_mark_open_files_invalid(struct cifs_tcon *tcon);
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extern void cifs_reopen_persistent_handles(struct cifs_tcon *tcon);
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@ -524,6 +524,8 @@ extern int E_md4hash(const unsigned char *passwd, unsigned char *p16,
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const struct nls_table *codepage);
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extern int SMBencrypt(unsigned char *passwd, const unsigned char *c8,
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unsigned char *p24);
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extern void
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cifs_cleanup_volume_info_contents(struct smb_vol *volume_info);
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void cifs_readdata_release(struct kref *refcount);
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int cifs_async_readv(struct cifs_readdata *rdata);
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@ -3747,8 +3747,8 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
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return 0;
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}
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static void
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cleanup_volume_info_contents(struct smb_vol *volume_info)
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void
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cifs_cleanup_volume_info_contents(struct smb_vol *volume_info)
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{
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kfree(volume_info->username);
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kzfree(volume_info->password);
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@ -3763,10 +3763,136 @@ cifs_cleanup_volume_info(struct smb_vol *volume_info)
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{
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if (!volume_info)
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return;
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cleanup_volume_info_contents(volume_info);
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cifs_cleanup_volume_info_contents(volume_info);
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kfree(volume_info);
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}
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/* Release all succeed connections */
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static inline void mount_put_conns(struct cifs_sb_info *cifs_sb,
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unsigned int xid,
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struct TCP_Server_Info *server,
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struct cifs_ses *ses, struct cifs_tcon *tcon)
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{
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int rc = 0;
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if (tcon)
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cifs_put_tcon(tcon);
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else if (ses)
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cifs_put_smb_ses(ses);
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else if (server)
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cifs_put_tcp_session(server, 0);
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cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
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free_xid(xid);
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}
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/* Get connections for tcp, ses and tcon */
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static int mount_get_conns(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
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unsigned int *xid,
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struct TCP_Server_Info **nserver,
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struct cifs_ses **nses, struct cifs_tcon **ntcon)
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{
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int rc = 0;
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struct TCP_Server_Info *server;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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*nserver = NULL;
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*nses = NULL;
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*ntcon = NULL;
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*xid = get_xid();
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/* get a reference to a tcp session */
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server = cifs_get_tcp_session(vol);
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if (IS_ERR(server)) {
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rc = PTR_ERR(server);
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return rc;
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}
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*nserver = server;
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if ((vol->max_credits < 20) || (vol->max_credits > 60000))
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server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
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else
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server->max_credits = vol->max_credits;
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/* get a reference to a SMB session */
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ses = cifs_get_smb_ses(server, vol);
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if (IS_ERR(ses)) {
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rc = PTR_ERR(ses);
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return rc;
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}
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*nses = ses;
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if ((vol->persistent == true) && (!(ses->server->capabilities &
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SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
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cifs_dbg(VFS, "persistent handles not supported by server\n");
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return -EOPNOTSUPP;
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}
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/* search for existing tcon to this server share */
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tcon = cifs_get_tcon(ses, vol);
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if (IS_ERR(tcon)) {
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rc = PTR_ERR(tcon);
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return rc;
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}
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*ntcon = tcon;
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/* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
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if (tcon->posix_extensions)
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cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
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/* tell server which Unix caps we support */
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if (cap_unix(tcon->ses)) {
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/*
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* reset of caps checks mount to see if unix extensions disabled
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* for just this mount.
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*/
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reset_cifs_unix_caps(*xid, tcon, cifs_sb, vol);
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if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
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(le64_to_cpu(tcon->fsUnixInfo.Capability) &
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CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP))
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return -EACCES;
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} else
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tcon->unix_ext = 0; /* server does not support them */
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/* do not care if a following call succeed - informational */
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if (!tcon->pipe && server->ops->qfs_tcon)
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server->ops->qfs_tcon(*xid, tcon);
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cifs_sb->wsize = server->ops->negotiate_wsize(tcon, vol);
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cifs_sb->rsize = server->ops->negotiate_rsize(tcon, vol);
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return 0;
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}
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static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
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struct cifs_tcon *tcon)
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{
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struct tcon_link *tlink;
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/* hang the tcon off of the superblock */
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tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
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if (tlink == NULL)
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return -ENOMEM;
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tlink->tl_uid = ses->linux_uid;
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tlink->tl_tcon = tcon;
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tlink->tl_time = jiffies;
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set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
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set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
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cifs_sb->master_tlink = tlink;
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spin_lock(&cifs_sb->tlink_tree_lock);
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tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
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spin_unlock(&cifs_sb->tlink_tree_lock);
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queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
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TLINK_IDLE_EXPIRE);
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return 0;
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}
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#ifdef CONFIG_CIFS_DFS_UPCALL
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/*
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@ -3846,7 +3972,7 @@ expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
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rc = PTR_ERR(mdata);
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mdata = NULL;
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} else {
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cleanup_volume_info_contents(volume_info);
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cifs_cleanup_volume_info_contents(volume_info);
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rc = cifs_setup_volume_info(volume_info, mdata,
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fake_devname, false);
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}
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@ -3955,107 +4081,77 @@ cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
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return rc;
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}
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int
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cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
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/*
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* Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
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* otherwise 0.
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*/
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static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb_vol *vol,
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const unsigned int xid,
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struct TCP_Server_Info *server,
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struct cifs_tcon *tcon)
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{
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int rc;
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char *full_path;
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if (!server->ops->is_path_accessible)
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return -EOPNOTSUPP;
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/*
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* cifs_build_path_to_root works only when we have a valid tcon
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*/
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full_path = cifs_build_path_to_root(vol, cifs_sb, tcon,
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tcon->Flags & SMB_SHARE_IS_IN_DFS);
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if (full_path == NULL)
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return -ENOMEM;
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cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
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rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
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full_path);
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if (rc != 0 && rc != -EREMOTE) {
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kfree(full_path);
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return rc;
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}
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if (rc != -EREMOTE) {
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rc = cifs_are_all_path_components_accessible(server, xid, tcon,
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cifs_sb,
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full_path);
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if (rc != 0) {
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cifs_dbg(VFS, "cannot query dirs between root and final path, "
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"enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
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cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
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rc = 0;
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}
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}
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kfree(full_path);
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return rc;
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}
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#ifdef CONFIG_CIFS_DFS_UPCALL
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int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
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{
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int rc = 0;
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unsigned int xid;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct cifs_tcon *tcon = NULL;
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struct TCP_Server_Info *server;
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char *full_path;
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struct tcon_link *tlink;
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#ifdef CONFIG_CIFS_DFS_UPCALL
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int referral_walks_count = 0;
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#endif
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char *old_mountdata;
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int count;
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#ifdef CONFIG_CIFS_DFS_UPCALL
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try_mount_again:
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/* cleanup activities if we're chasing a referral */
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if (referral_walks_count) {
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if (tcon)
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cifs_put_tcon(tcon);
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else if (ses)
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cifs_put_smb_ses(ses);
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cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
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free_xid(xid);
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rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
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if (!rc && tcon) {
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rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
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if (!rc)
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goto out;
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if (rc != -EREMOTE)
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goto error;
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}
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#endif
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rc = 0;
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tcon = NULL;
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ses = NULL;
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server = NULL;
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full_path = NULL;
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tlink = NULL;
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if ((rc == -EACCES) || (rc == -EOPNOTSUPP) || (ses == NULL) || (server == NULL))
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goto error;
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xid = get_xid();
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/* get a reference to a tcp session */
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server = cifs_get_tcp_session(volume_info);
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if (IS_ERR(server)) {
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rc = PTR_ERR(server);
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goto out;
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}
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if ((volume_info->max_credits < 20) ||
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(volume_info->max_credits > 60000))
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server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
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else
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server->max_credits = volume_info->max_credits;
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/* get a reference to a SMB session */
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ses = cifs_get_smb_ses(server, volume_info);
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if (IS_ERR(ses)) {
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rc = PTR_ERR(ses);
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ses = NULL;
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goto mount_fail_check;
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}
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if ((volume_info->persistent == true) && ((ses->server->capabilities &
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SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
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cifs_dbg(VFS, "persistent handles not supported by server\n");
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rc = -EOPNOTSUPP;
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goto mount_fail_check;
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}
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/* search for existing tcon to this server share */
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tcon = cifs_get_tcon(ses, volume_info);
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if (IS_ERR(tcon)) {
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rc = PTR_ERR(tcon);
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tcon = NULL;
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if (rc == -EACCES)
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goto mount_fail_check;
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goto remote_path_check;
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}
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/* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
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if (tcon->posix_extensions)
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cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
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/* tell server which Unix caps we support */
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if (cap_unix(tcon->ses)) {
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/* reset of caps checks mount to see if unix extensions
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disabled for just this mount */
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reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
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if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
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(le64_to_cpu(tcon->fsUnixInfo.Capability) &
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CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
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rc = -EACCES;
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goto mount_fail_check;
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}
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} else
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tcon->unix_ext = 0; /* server does not support them */
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/* do not care if a following call succeed - informational */
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if (!tcon->pipe && server->ops->qfs_tcon)
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server->ops->qfs_tcon(xid, tcon);
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cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
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cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
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remote_path_check:
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#ifdef CONFIG_CIFS_DFS_UPCALL
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/*
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* Perform an unconditional check for whether there are DFS
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* referrals for this path without prefix, to provide support
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@ -4063,119 +4159,100 @@ remote_path_check:
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* with PATH_NOT_COVERED to requests that include the prefix.
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* Chase the referral if found, otherwise continue normally.
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*/
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if (referral_walks_count == 0) {
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int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
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false);
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if (!refrc) {
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referral_walks_count++;
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goto try_mount_again;
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}
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}
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#endif
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old_mountdata = cifs_sb->mountdata;
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(void)expand_dfs_referral(xid, ses, vol, cifs_sb, false);
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/* check if a whole path is not remote */
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if (!rc && tcon) {
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if (!server->ops->is_path_accessible) {
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rc = -ENOSYS;
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goto mount_fail_check;
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if (cifs_sb->mountdata == NULL) {
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rc = -ENOENT;
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goto error;
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}
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if (cifs_sb->mountdata != old_mountdata) {
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/* If we were redirected, reconnect to new target server */
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mount_put_conns(cifs_sb, xid, server, ses, tcon);
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rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
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}
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if (rc) {
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if (rc == -EACCES || rc == -EOPNOTSUPP)
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goto error;
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}
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for (count = 1; ;) {
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if (!rc && tcon) {
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rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
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if (!rc || rc != -EREMOTE)
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break;
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}
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/*
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* cifs_build_path_to_root works only when we have a valid tcon
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* BB: when we implement proper loop detection,
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* we will remove this check. But now we need it
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* to prevent an indefinite loop if 'DFS tree' is
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* misconfigured (i.e. has loops).
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*/
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full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
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tcon->Flags & SMB_SHARE_IS_IN_DFS);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto mount_fail_check;
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}
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rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
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full_path);
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if (rc != 0 && rc != -EREMOTE) {
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kfree(full_path);
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goto mount_fail_check;
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}
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if (rc != -EREMOTE) {
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rc = cifs_are_all_path_components_accessible(server,
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xid, tcon, cifs_sb,
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full_path);
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if (rc != 0) {
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cifs_dbg(VFS, "cannot query dirs between root and final path, "
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"enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
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cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
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rc = 0;
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}
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}
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kfree(full_path);
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}
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/* get referral if needed */
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if (rc == -EREMOTE) {
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#ifdef CONFIG_CIFS_DFS_UPCALL
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if (referral_walks_count > MAX_NESTED_LINKS) {
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/*
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* BB: when we implement proper loop detection,
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* we will remove this check. But now we need it
|
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* to prevent an indefinite loop if 'DFS tree' is
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* misconfigured (i.e. has loops).
|
||||
*/
|
||||
if (count++ > MAX_NESTED_LINKS) {
|
||||
rc = -ELOOP;
|
||||
goto mount_fail_check;
|
||||
break;
|
||||
}
|
||||
|
||||
rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
|
||||
old_mountdata = cifs_sb->mountdata;
|
||||
rc = expand_dfs_referral(xid, tcon->ses, vol, cifs_sb,
|
||||
true);
|
||||
if (rc)
|
||||
break;
|
||||
|
||||
if (!rc) {
|
||||
referral_walks_count++;
|
||||
goto try_mount_again;
|
||||
if (cifs_sb->mountdata != old_mountdata) {
|
||||
mount_put_conns(cifs_sb, xid, server, ses, tcon);
|
||||
rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses,
|
||||
&tcon);
|
||||
}
|
||||
if (rc) {
|
||||
if (rc == -EACCES || rc == -EOPNOTSUPP || !server ||
|
||||
!ses)
|
||||
goto error;
|
||||
}
|
||||
goto mount_fail_check;
|
||||
#else /* No DFS support, return error on mount */
|
||||
rc = -EOPNOTSUPP;
|
||||
#endif
|
||||
}
|
||||
|
||||
if (rc)
|
||||
goto mount_fail_check;
|
||||
|
||||
/* now, hang the tcon off of the superblock */
|
||||
tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
|
||||
if (tlink == NULL) {
|
||||
rc = -ENOMEM;
|
||||
goto mount_fail_check;
|
||||
}
|
||||
|
||||
tlink->tl_uid = ses->linux_uid;
|
||||
tlink->tl_tcon = tcon;
|
||||
tlink->tl_time = jiffies;
|
||||
set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
|
||||
set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
|
||||
|
||||
cifs_sb->master_tlink = tlink;
|
||||
spin_lock(&cifs_sb->tlink_tree_lock);
|
||||
tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
|
||||
spin_unlock(&cifs_sb->tlink_tree_lock);
|
||||
|
||||
queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
|
||||
TLINK_IDLE_EXPIRE);
|
||||
|
||||
mount_fail_check:
|
||||
/* on error free sesinfo and tcon struct if needed */
|
||||
if (rc) {
|
||||
/* If find_unc succeeded then rc == 0 so we can not end */
|
||||
/* up accidentally freeing someone elses tcon struct */
|
||||
if (tcon)
|
||||
cifs_put_tcon(tcon);
|
||||
else if (ses)
|
||||
cifs_put_smb_ses(ses);
|
||||
else
|
||||
cifs_put_tcp_session(server, 0);
|
||||
}
|
||||
goto error;
|
||||
|
||||
out:
|
||||
free_xid(xid);
|
||||
return mount_setup_tlink(cifs_sb, ses, tcon);
|
||||
|
||||
error:
|
||||
mount_put_conns(cifs_sb, xid, server, ses, tcon);
|
||||
return rc;
|
||||
}
|
||||
#else
|
||||
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
|
||||
{
|
||||
int rc = 0;
|
||||
unsigned int xid;
|
||||
struct cifs_ses *ses;
|
||||
struct cifs_tcon *tcon;
|
||||
struct TCP_Server_Info *server;
|
||||
|
||||
rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
|
||||
if (rc)
|
||||
goto error;
|
||||
|
||||
if (tcon) {
|
||||
rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
|
||||
if (rc == -EREMOTE)
|
||||
rc = -EOPNOTSUPP;
|
||||
if (rc)
|
||||
goto error;
|
||||
}
|
||||
|
||||
free_xid(xid);
|
||||
|
||||
return mount_setup_tlink(cifs_sb, ses, tcon);
|
||||
|
||||
error:
|
||||
mount_put_conns(cifs_sb, xid, server, ses, tcon);
|
||||
return rc;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Issue a TREE_CONNECT request.
|
||||
|
|
|
|||
Loading…
Reference in a new issue