cifs: refactor new_inode() calls and inode initialization

Move new inode creation into a separate routine and refactor the
callers to take advantage of it.

Signed-off-by: Jeff Layton <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/cifs/cifsproto.h

···
 extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
 extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
 
+extern struct inode *cifs_new_inode(struct super_block *sb,
+				    unsigned long *inum);
 extern int cifs_get_inode_info(struct inode **pinode,
 			const unsigned char *search_path,
 			FILE_ALL_INFO *pfile_info,

fs/cifs/inode.c

···
 	pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 }
 
+/**
+ * cifs_new inode - create new inode, initialize, and hash it
+ * @sb - pointer to superblock
+ * @inum - if valid pointer and serverino is enabled, replace i_ino with val
+ *
+ * Create a new inode, initialize it for CIFS and hash it. Returns the new
+ * inode or NULL if one couldn't be allocated.
+ *
+ * If the share isn't mounted with "serverino" or inum is a NULL pointer then
+ * we'll just use the inode number assigned by new_inode(). Note that this can
+ * mean i_ino collisions since the i_ino assigned by new_inode is not
+ * guaranteed to be unique.
+ */
+struct inode *
+cifs_new_inode(struct super_block *sb, unsigned long *inum)
+{
+	struct inode *inode;
+
+	inode = new_inode(sb);
+	if (inode == NULL)
+		return NULL;
+
+	/*
+	 * BB: Is i_ino == 0 legal? Here, we assume that it is. If it isn't we
+	 *     stop passing inum as ptr. Are there sanity checks we can use to
+	 *     ensure that the server is really filling in that field? Also,
+	 *     if serverino is disabled, perhaps we should be using iunique()?
+	 */
+	if (inum && (CIFS_SB(sb)->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
+		inode->i_ino = *inum;
+
+	/*
+	 * must set this here instead of cifs_alloc_inode since VFS will
+	 * clobber i_flags
+	 */
+	if (sb->s_flags & MS_NOATIME)
+		inode->i_flags |= S_NOATIME | S_NOCMTIME;
+
+	insert_inode_hash(inode);
+
+	return inode;
+}
+
 int cifs_get_inode_info_unix(struct inode **pinode,
 	const unsigned char *full_path, struct super_block *sb, int xid)
 {
···
 
 	/* get new inode */
 	if (*pinode == NULL) {
-		*pinode = new_inode(sb);
+		*pinode = cifs_new_inode(sb, (unsigned long *)
+						&find_data.UniqueId);
 		if (*pinode == NULL) {
 			rc = -ENOMEM;
 			goto cgiiu_exit;
 		}
-		/* Is an i_ino of zero legal? */
-		/* note ino incremented to unique num in new_inode */
-		/* Are there sanity checks we can use to ensure that
-		   the server is really filling in that field? */
-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
-			(*pinode)->i_ino = (unsigned long)find_data.UniqueId;
-
-		if (sb->s_flags & MS_NOATIME)
-			(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
-
-		insert_inode_hash(*pinode);
 	}
 
 	inode = *pinode;
···
 
 	/* get new inode */
 	if (*pinode == NULL) {
-		*pinode = new_inode(sb);
-		if (*pinode == NULL) {
-			rc = -ENOMEM;
-			goto cgii_exit;
-		}
+		__u64 inode_num;
+
 		/* Is an i_ino of zero legal? Can we use that to check
 		   if the server supports returning inode numbers?  Are
 		   there other sanity checks we can use to ensure that
···
 
 		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 			int rc1 = 0;
-			__u64 inode_num;
 
 			rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 					full_path, &inode_num,
···
 			if (rc1) {
 				cFYI(1, ("GetSrvInodeNum rc %d", rc1));
 				/* BB EOPNOSUPP disable SERVER_INUM? */
-			} else /* do we need cast or hash to ino? */
-				(*pinode)->i_ino = inode_num;
-		} /* else ino incremented to unique num in new_inode*/
-		if (sb->s_flags & MS_NOATIME)
-			(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
-		insert_inode_hash(*pinode);
+			}
+			*pinode = cifs_new_inode(sb, (unsigned long *)
+							&inode_num);
+		} else {
+			*pinode = cifs_new_inode(sb, NULL);
+		}
+
+		if (*pinode == NULL) {
+			rc = -ENOMEM;
+			goto cgii_exit;
+		}
 	}
 	inode = *pinode;
 	cifsInfo = CIFS_I(inode);
···
 			else
 				direntry->d_op = &cifs_dentry_ops;
 
-			newinode = new_inode(inode->i_sb);
+			newinode = cifs_new_inode(inode->i_sb, (unsigned long *)
+							&pInfo->UniqueId);
 			if (newinode == NULL) {
 				kfree(pInfo);
 				goto mkdir_get_info;
 			}
 
-			/* Is an i_ino of zero legal? */
-			/* Are there sanity checks we can use to ensure that
-			   the server is really filling in that field? */
-			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
-				newinode->i_ino =
-					(unsigned long)pInfo->UniqueId;
-			} /* note ino incremented to unique num in new_inode */
-			if (inode->i_sb->s_flags & MS_NOATIME)
-				newinode->i_flags |= S_NOATIME | S_NOCMTIME;
 			newinode->i_nlink = 2;
-
-			insert_inode_hash(newinode);
 			d_instantiate(direntry, newinode);
 
 			/* we already checked in POSIXCreate whether

fs/cifs/readdir.c

···
 }
 #endif /* DEBUG2 */
 
-/* Returns one if new inode created (which therefore needs to be hashed) */
+/* Returns 1 if new inode created, 2 if both dentry and inode were */
 /* Might check in the future if inode number changed so we can rehash inode */
-static int construct_dentry(struct qstr *qstring, struct file *file,
-	struct inode **ptmp_inode, struct dentry **pnew_dentry)
+static int
+construct_dentry(struct qstr *qstring, struct file *file,
+		 struct inode **ptmp_inode, struct dentry **pnew_dentry,
+		 unsigned long *inum)
 {
-	struct dentry *tmp_dentry;
-	struct cifs_sb_info *cifs_sb;
-	struct cifsTconInfo *pTcon;
+	struct dentry *tmp_dentry = NULL;
+	struct super_block *sb = file->f_path.dentry->d_sb;
 	int rc = 0;
 
 	cFYI(1, ("For %s", qstring->name));
-	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	pTcon = cifs_sb->tcon;
 
 	qstring->hash = full_name_hash(qstring->name, qstring->len);
 	tmp_dentry = d_lookup(file->f_path.dentry, qstring);
 	if (tmp_dentry) {
+		/* BB: overwrite old name? i.e. tmp_dentry->d_name and
+		 * tmp_dentry->d_name.len??
+		 */
 		cFYI(0, ("existing dentry with inode 0x%p",
 			 tmp_dentry->d_inode));
 		*ptmp_inode = tmp_dentry->d_inode;
-/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
 		if (*ptmp_inode == NULL) {
-			*ptmp_inode = new_inode(file->f_path.dentry->d_sb);
+			*ptmp_inode = cifs_new_inode(sb, inum);
 			if (*ptmp_inode == NULL)
 				return rc;
 			rc = 1;
 		}
-		if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
-			(*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 	} else {
 		tmp_dentry = d_alloc(file->f_path.dentry, qstring);
 		if (tmp_dentry == NULL) {
···
 			return rc;
 		}
 
-		*ptmp_inode = new_inode(file->f_path.dentry->d_sb);
-		if (pTcon->nocase)
+		if (CIFS_SB(sb)->tcon->nocase)
 			tmp_dentry->d_op = &cifs_ci_dentry_ops;
 		else
 			tmp_dentry->d_op = &cifs_dentry_ops;
+
+		*ptmp_inode = cifs_new_inode(sb, inum);
 		if (*ptmp_inode == NULL)
 			return rc;
-		if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
-			(*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 		rc = 2;
 	}
 
···
 			len = strnlen(filename, PATH_MAX);
 		}
 
-		/* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
-			*pinum = pFindData->UniqueId;
+		*pinum = pFindData->UniqueId;
 	} else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
 		FILE_DIRECTORY_INFO *pFindData =
 			(FILE_DIRECTORY_INFO *)current_entry;
···
 	if (rc)
 		return rc;
 
-	rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
+	/* only these two infolevels return valid inode numbers */
+	if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
+	    pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
+		rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
+					&inum);
+	else
+		rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
+					NULL);
+
 	if ((tmp_inode == NULL) || (tmp_dentry == NULL))
 		return -ENOMEM;
-
-	if (rc) {
-		/* inode created, we need to hash it with right inode number */
-		if (inum != 0) {
-			/* BB fixme - hash the 2 32 quantities bits together if
-			 *  necessary BB */
-			tmp_inode->i_ino = inum;
-		}
-		insert_inode_hash(tmp_inode);
-	}
 
 	/* we pass in rc below, indicating whether it is a new inode,
 	   so we can figure out whether to invalidate the inode cached