fs/udf/ialloc.c

Source file repositories/reference/linux-study-clean/fs/udf/ialloc.c

File Facts

System
Linux kernel
Corpus path
fs/udf/ialloc.c
Extension
.c
Size
2791 bytes
Lines
114
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ialloc.c
 *
 * PURPOSE
 *	Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
 *
 * COPYRIGHT
 *  (C) 1998-2001 Ben Fennema
 *
 * HISTORY
 *
 *  02/24/99 blf  Created.
 *
 */

#include "udfdecl.h"
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include "udf_i.h"
#include "udf_sb.h"

void udf_free_inode(struct inode *inode)
{
	udf_free_blocks(inode->i_sb, NULL, &UDF_I(inode)->i_location, 0, 1);
}

struct inode *udf_new_inode(struct inode *dir, umode_t mode)
{
	struct super_block *sb = dir->i_sb;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct inode *inode;
	udf_pblk_t block;
	uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
	struct udf_inode_info *iinfo;
	struct udf_inode_info *dinfo = UDF_I(dir);
	int err;

	inode = new_inode(sb);

	if (!inode)
		return ERR_PTR(-ENOMEM);

	iinfo = UDF_I(inode);
	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
		iinfo->i_efe = 1;
		if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
			sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
		iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
					sizeof(struct extendedFileEntry),
					GFP_KERNEL);
	} else {
		iinfo->i_efe = 0;
		iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
					sizeof(struct fileEntry),
					GFP_KERNEL);
	}
	if (!iinfo->i_data) {
		make_bad_inode(inode);
		iput(inode);
		return ERR_PTR(-ENOMEM);
	}

	err = -ENOSPC;
	block = udf_new_block(dir->i_sb, NULL,
			      dinfo->i_location.partitionReferenceNum,
			      start, &err);
	if (err) {
		make_bad_inode(inode);
		iput(inode);
		return ERR_PTR(err);
	}

	iinfo->i_unique = lvid_get_unique_id(sb);
	inode->i_generation = iinfo->i_unique;

	inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
		inode->i_uid = sbi->s_uid;
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
		inode->i_gid = sbi->s_gid;

	iinfo->i_location.logicalBlockNum = block;
	iinfo->i_location.partitionReferenceNum =
				dinfo->i_location.partitionReferenceNum;
	inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
	inode->i_blocks = 0;
	iinfo->i_lenEAttr = 0;

Annotation

Implementation Notes