[CIFS] consolidate duplicate code in posix/unix inode handling

Signed-off-by: NChristoph Hellwig <hch@infradead.org>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/inode.c

@@ -69,6 +69,90 @@ static void cifs_set_ops(struct inode *inode)
 	}
 }
 
+static void cifs_unix_info_to_inode(struct inode *inode,
+		FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
+	__u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
+	__u64 end_of_file = le64_to_cpu(info->EndOfFile);
+
+	inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
+	inode->i_mtime =
+		cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
+	inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
+	inode->i_mode = le64_to_cpu(info->Permissions);
+
+	/*
+	 * Since we set the inode type below we need to mask off
+	 * to avoid strange results if bits set above.
+	 */
+	inode->i_mode &= ~S_IFMT;
+	switch (le32_to_cpu(info->Type)) {
+	case UNIX_FILE:
+		inode->i_mode |= S_IFREG;
+		break;
+	case UNIX_SYMLINK:
+		inode->i_mode |= S_IFLNK;
+		break;
+	case UNIX_DIR:
+		inode->i_mode |= S_IFDIR;
+		break;
+	case UNIX_CHARDEV:
+		inode->i_mode |= S_IFCHR;
+		inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
+				      le64_to_cpu(info->DevMinor) & MINORMASK);
+		break;
+	case UNIX_BLOCKDEV:
+		inode->i_mode |= S_IFBLK;
+		inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
+				      le64_to_cpu(info->DevMinor) & MINORMASK);
+		break;
+	case UNIX_FIFO:
+		inode->i_mode |= S_IFIFO;
+		break;
+	case UNIX_SOCKET:
+		inode->i_mode |= S_IFSOCK;
+		break;
+	default:
+		/* safest to call it a file if we do not know */
+		inode->i_mode |= S_IFREG;
+		cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
+		break;
+	}
+
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
+	    !force_uid_gid)
+		inode->i_uid = cifs_sb->mnt_uid;
+	else
+		inode->i_uid = le64_to_cpu(info->Uid);
+
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
+	    !force_uid_gid)
+		inode->i_gid = cifs_sb->mnt_gid;
+	else
+		inode->i_gid = le64_to_cpu(info->Gid);
+
+	inode->i_nlink = le64_to_cpu(info->Nlinks);
+
+	spin_lock(&inode->i_lock);
+	if (is_size_safe_to_change(cifsInfo, end_of_file)) {
+		/*
+		 * We can not safely change the file size here if the client
+		 * is writing to it due to potential races.
+		 */
+		i_size_write(inode, end_of_file);
+
+		/*
+		 * i_blocks is not related to (i_size / i_blksize),
+		 * but instead 512 byte (2**9) size is required for
+		 * calculating num blocks.
+		 */
+		inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
+	}
+	spin_unlock(&inode->i_lock);
+}
+
 int cifs_get_inode_info_unix(struct inode **pinode,
 	const unsigned char *search_path, struct super_block *sb, int xid)
 {
@@ -114,7 +198,6 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 		}
 	} else {
 		struct cifsInodeInfo *cifsInfo;
-		__u32 type = le32_to_cpu(findData.Type);
 		__u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
 		__u64 end_of_file = le64_to_cpu(findData.EndOfFile);
 
@@ -145,73 +228,8 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 		/* this is ok to set on every inode revalidate */
 		atomic_set(&cifsInfo->inUse, 1);
 
-		inode->i_atime =
-		    cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
-		inode->i_mtime =
-		    cifs_NTtimeToUnix(le64_to_cpu
-				(findData.LastModificationTime));
-		inode->i_ctime =
-		    cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
-		inode->i_mode = le64_to_cpu(findData.Permissions);
-		/* since we set the inode type below we need to mask off
-		   to avoid strange results if bits set above */
-		inode->i_mode &= ~S_IFMT;
-		if (type == UNIX_FILE) {
-			inode->i_mode |= S_IFREG;
-		} else if (type == UNIX_SYMLINK) {
-			inode->i_mode |= S_IFLNK;
-		} else if (type == UNIX_DIR) {
-			inode->i_mode |= S_IFDIR;
-		} else if (type == UNIX_CHARDEV) {
-			inode->i_mode |= S_IFCHR;
-			inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
-				le64_to_cpu(findData.DevMinor) & MINORMASK);
-		} else if (type == UNIX_BLOCKDEV) {
-			inode->i_mode |= S_IFBLK;
-			inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
-				le64_to_cpu(findData.DevMinor) & MINORMASK);
-		} else if (type == UNIX_FIFO) {
-			inode->i_mode |= S_IFIFO;
-		} else if (type == UNIX_SOCKET) {
-			inode->i_mode |= S_IFSOCK;
-		} else {
-			/* safest to call it a file if we do not know */
-			inode->i_mode |= S_IFREG;
-			cFYI(1, ("unknown type %d", type));
-		}
-
-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
-			inode->i_uid = cifs_sb->mnt_uid;
-		else
-			inode->i_uid = le64_to_cpu(findData.Uid);
-
-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
-			inode->i_gid = cifs_sb->mnt_gid;
-		else
-			inode->i_gid = le64_to_cpu(findData.Gid);
-
-		inode->i_nlink = le64_to_cpu(findData.Nlinks);
-
-		spin_lock(&inode->i_lock);
-		if (is_size_safe_to_change(cifsInfo, end_of_file)) {
-		/* can not safely change the file size here if the
-		   client is writing to it due to potential races */
-			i_size_write(inode, end_of_file);
-
-		/* blksize needs to be multiple of two. So safer to default to
-		blksize and blkbits set in superblock so 2**blkbits and blksize
-		will match rather than setting to:
-		(pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
+		cifs_unix_info_to_inode(inode, &findData, 0);
 
-		/* This seems incredibly stupid but it turns out that i_blocks
-		   is not related to (i_size / i_blksize), instead 512 byte size
-		   is required for calculating num blocks */
-
-		/* 512 bytes (2**9) is the fake blocksize that must be used */
-		/* for this calculation */
-			inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
-		}
-		spin_unlock(&inode->i_lock);
 
 		if (num_of_bytes < end_of_file)
 			cFYI(1, ("allocation size less than end of file"));
@@ -774,15 +792,10 @@ int cifs_unlink(struct inode *inode, struct dentry *direntry)
 static void posix_fill_in_inode(struct inode *tmp_inode,
 	FILE_UNIX_BASIC_INFO *pData, int *pobject_type, int isNewInode)
 {
+	struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 	loff_t local_size;
 	struct timespec local_mtime;
 
-	struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
-	struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
-
-	__u32 type = le32_to_cpu(pData->Type);
-	__u64 num_of_bytes = le64_to_cpu(pData->NumOfBytes);
-	__u64 end_of_file = le64_to_cpu(pData->EndOfFile);
 	cifsInfo->time = jiffies;
 	atomic_inc(&cifsInfo->inUse);
 
@@ -790,113 +803,27 @@ static void posix_fill_in_inode(struct inode *tmp_inode,
 	local_mtime = tmp_inode->i_mtime;
 	local_size  = tmp_inode->i_size;
 
-	tmp_inode->i_atime =
-	    cifs_NTtimeToUnix(le64_to_cpu(pData->LastAccessTime));
-	tmp_inode->i_mtime =
-	    cifs_NTtimeToUnix(le64_to_cpu(pData->LastModificationTime));
-	tmp_inode->i_ctime =
-	    cifs_NTtimeToUnix(le64_to_cpu(pData->LastStatusChange));
-
-	tmp_inode->i_mode = le64_to_cpu(pData->Permissions);
-	/* since we set the inode type below we need to mask off type
-	   to avoid strange results if bits above were corrupt */
-	tmp_inode->i_mode &= ~S_IFMT;
-	if (type == UNIX_FILE) {
-		*pobject_type = DT_REG;
-		tmp_inode->i_mode |= S_IFREG;
-	} else if (type == UNIX_SYMLINK) {
-		*pobject_type = DT_LNK;
-		tmp_inode->i_mode |= S_IFLNK;
-	} else if (type == UNIX_DIR) {
-		*pobject_type = DT_DIR;
-		tmp_inode->i_mode |= S_IFDIR;
-	} else if (type == UNIX_CHARDEV) {
-		*pobject_type = DT_CHR;
-		tmp_inode->i_mode |= S_IFCHR;
-		tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
-				le64_to_cpu(pData->DevMinor) & MINORMASK);
-	} else if (type == UNIX_BLOCKDEV) {
-		*pobject_type = DT_BLK;
-		tmp_inode->i_mode |= S_IFBLK;
-		tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
-				le64_to_cpu(pData->DevMinor) & MINORMASK);
-	} else if (type == UNIX_FIFO) {
-		*pobject_type = DT_FIFO;
-		tmp_inode->i_mode |= S_IFIFO;
-	} else if (type == UNIX_SOCKET) {
-		*pobject_type = DT_SOCK;
-		tmp_inode->i_mode |= S_IFSOCK;
-	} else {
-		/* safest to just call it a file */
-		*pobject_type = DT_REG;
-		tmp_inode->i_mode |= S_IFREG;
-		cFYI(1, ("unknown inode type %d", type));
-	}
-
-	cFYI(DBG2, ("object type: %d", type));
-	tmp_inode->i_uid = le64_to_cpu(pData->Uid);
-	tmp_inode->i_gid = le64_to_cpu(pData->Gid);
-	tmp_inode->i_nlink = le64_to_cpu(pData->Nlinks);
+	cifs_unix_info_to_inode(tmp_inode, pData, 1);
+	cifs_set_ops(tmp_inode);
 
-	spin_lock(&tmp_inode->i_lock);
-	if (is_size_safe_to_change(cifsInfo, end_of_file)) {
-		/* can not safely change the file size here if the
-		client is writing to it due to potential races */
-		i_size_write(tmp_inode, end_of_file);
-
-	/* 512 bytes (2**9) is the fake blocksize that must be used */
-	/* for this calculation, not the real blocksize */
-		tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
-	}
-	spin_unlock(&tmp_inode->i_lock);
-
-	if (S_ISREG(tmp_inode->i_mode)) {
-		cFYI(1, ("File inode"));
-		tmp_inode->i_op = &cifs_file_inode_ops;
-
-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
-			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
-				tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
-			else
-				tmp_inode->i_fop = &cifs_file_direct_ops;
+	if (!S_ISREG(tmp_inode->i_mode))
+		return;
 
-		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
-			tmp_inode->i_fop = &cifs_file_nobrl_ops;
-		else
-			tmp_inode->i_fop = &cifs_file_ops;
-
-		if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
-		   (cifs_sb->tcon->ses->server->maxBuf <
-			PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
-			tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
-		else
-			tmp_inode->i_data.a_ops = &cifs_addr_ops;
-
-		if (isNewInode)
-			return; /* No sense invalidating pages for new inode
-				   since we we have not started caching
-				   readahead file data yet */
+	/*
+	 * No sense invalidating pages for new inode
+	 * since we we have not started caching
+	 * readahead file data yet.
+	 */
+	if (isNewInode)
+		return;
 
-		if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
-			(local_size == tmp_inode->i_size)) {
-			cFYI(1, ("inode exists but unchanged"));
-		} else {
-			/* file may have changed on server */
-			cFYI(1, ("invalidate inode, readdir detected change"));
-			invalidate_remote_inode(tmp_inode);
-		}
-	} else if (S_ISDIR(tmp_inode->i_mode)) {
-		cFYI(1, ("Directory inode"));
-		tmp_inode->i_op = &cifs_dir_inode_ops;
-		tmp_inode->i_fop = &cifs_dir_ops;
-	} else if (S_ISLNK(tmp_inode->i_mode)) {
-		cFYI(1, ("Symbolic Link inode"));
-		tmp_inode->i_op = &cifs_symlink_inode_ops;
-/* tmp_inode->i_fop = *//* do not need to set to anything */
+	if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
+		(local_size == tmp_inode->i_size)) {
+		cFYI(1, ("inode exists but unchanged"));
 	} else {
-		cFYI(1, ("Special inode"));
-		init_special_inode(tmp_inode, tmp_inode->i_mode,
-				   tmp_inode->i_rdev);
+		/* file may have changed on server */
+		cFYI(1, ("invalidate inode, readdir detected change"));
+		invalidate_remote_inode(tmp_inode);
 	}
 }