fs/adfs/dir_fplus.c

Source file repositories/reference/linux-study-clean/fs/adfs/dir_fplus.c

File Facts

System
Linux kernel
Corpus path
fs/adfs/dir_fplus.c
Extension
.c
Size
7249 bytes
Lines
288
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

if (offset >= end) {
			adfs_error(dir->sb, "unable to locate entry to update");
			return -ENOENT;
		}
		ret = adfs_dir_copyfrom(&bde, dir, offset, sizeof(bde));
		if (ret) {
			adfs_error(dir->sb, "error reading directory entry");
			return -ENOENT;
		}
	} while (le32_to_cpu(bde.bigdirindaddr) != obj->indaddr);

	bde.bigdirload    = cpu_to_le32(obj->loadaddr);
	bde.bigdirexec    = cpu_to_le32(obj->execaddr);
	bde.bigdirlen     = cpu_to_le32(obj->size);
	bde.bigdirindaddr = cpu_to_le32(obj->indaddr);
	bde.bigdirattr    = cpu_to_le32(obj->attr);

	return adfs_dir_copyto(dir, offset, &bde, sizeof(bde));
}

static int adfs_fplus_commit(struct adfs_dir *dir)
{
	int ret;

	/* Increment directory sequence number */
	dir->bighead->startmasseq += 1;
	dir->bigtail->bigdirendmasseq += 1;

	/* Update directory check byte */
	dir->bigtail->bigdircheckbyte = adfs_fplus_checkbyte(dir);

	/* Make sure the directory still validates correctly */
	ret = adfs_fplus_validate_header(dir->bighead);
	if (ret == 0)
		ret = adfs_fplus_validate_tail(dir->bighead, dir->bigtail);

	return ret;
}

const struct adfs_dir_ops adfs_fplus_dir_ops = {
	.read		= adfs_fplus_read,
	.iterate	= adfs_fplus_iterate,
	.setpos		= adfs_fplus_setpos,
	.getnext	= adfs_fplus_getnext,
	.update		= adfs_fplus_update,
	.commit		= adfs_fplus_commit,
};

Annotation

Implementation Notes