fs/inode.c

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

File Facts

System
Linux kernel
Corpus path
fs/inode.c
Extension
.c
Size
87512 bytes
Lines
3124
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: operation-table or driver-model contract
Status
pattern 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

static const struct file_operations no_open_fops = {.open = no_open};
	struct address_space *const mapping = &inode->i_data;

	inode->i_sb = sb;
	inode->i_blkbits = sb->s_blocksize_bits;
	inode->i_flags = 0;
	inode_state_assign_raw(inode, 0);
	atomic64_set(&inode->i_sequence, 0);
	atomic_set(&inode->i_count, 1);
	inode->i_op = &empty_iops;
	inode->i_fop = &no_open_fops;
	inode->i_ino = 0;
	inode->__i_nlink = 1;
	inode->i_opflags = 0;
	if (sb->s_xattr)
		inode->i_opflags |= IOP_XATTR;
	if (sb->s_type->fs_flags & FS_MGTIME)
		inode->i_opflags |= IOP_MGTIME;
	i_uid_write(inode, 0);
	i_gid_write(inode, 0);
	atomic_set(&inode->i_writecount, 0);
	inode->i_size = 0;
	inode->i_write_hint = WRITE_LIFE_NOT_SET;
	inode->i_blocks = 0;
	inode->i_bytes = 0;
	inode->i_generation = 0;
	inode->i_pipe = NULL;
	inode->i_cdev = NULL;
	inode->i_link = NULL;
	inode->i_dir_seq = 0;
	inode->i_rdev = 0;
	inode->dirtied_when = 0;

#ifdef CONFIG_CGROUP_WRITEBACK
	inode->i_wb_frn_winner = 0;
	inode->i_wb_frn_avg_time = 0;
	inode->i_wb_frn_history = 0;
#endif

	spin_lock_init(&inode->i_lock);
	lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key);

	init_rwsem(&inode->i_rwsem);
	lockdep_set_class(&inode->i_rwsem, &sb->s_type->i_mutex_key);

	atomic_set(&inode->i_dio_count, 0);

	mapping->a_ops = &empty_aops;
	mapping->host = inode;
	mapping->flags = 0;
	mapping->wb_err = 0;
	atomic_set(&mapping->i_mmap_writable, 0);
#ifdef CONFIG_READ_ONLY_THP_FOR_FS
	atomic_set(&mapping->nr_thps, 0);
#endif
	mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE);
	mapping->writeback_index = 0;
	init_rwsem(&mapping->invalidate_lock);
	lockdep_set_class_and_name(&mapping->invalidate_lock,
				   &sb->s_type->invalidate_lock_key,
				   "mapping.invalidate_lock");
	if (sb->s_iflags & SB_I_STABLE_WRITES)
		mapping_set_stable_writes(mapping);
	inode->i_private = NULL;
	inode->i_mapping = mapping;
	INIT_HLIST_HEAD(&inode->i_dentry);	/* buggered by rcu freeing */
#ifdef CONFIG_FS_POSIX_ACL
	inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED;
#endif

#ifdef CONFIG_FSNOTIFY
	inode->i_fsnotify_mask = 0;
#endif
	inode->i_flctx = NULL;

	if (unlikely(security_inode_alloc(inode, gfp)))
		return -ENOMEM;

	this_cpu_inc(nr_inodes);

	return 0;
}
EXPORT_SYMBOL(inode_init_always_gfp);

void free_inode_nonrcu(struct inode *inode)
{
	kmem_cache_free(inode_cachep, inode);
}
EXPORT_SYMBOL(free_inode_nonrcu);

Annotation

Implementation Notes