fs/ocfs2/dlmfs/userdlm.h

Source file repositories/reference/linux-study-clean/fs/ocfs2/dlmfs/userdlm.h

File Facts

System
Linux kernel
Corpus path
fs/ocfs2/dlmfs/userdlm.h
Extension
.h
Size
2601 bytes
Lines
96
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

struct user_lock_res {
	spinlock_t               l_lock;

	int                      l_flags;

#define USER_DLM_LOCK_ID_MAX_LEN  32
	char                     l_name[USER_DLM_LOCK_ID_MAX_LEN];
	int                      l_namelen;
	int                      l_level;
	unsigned int             l_ro_holders;
	unsigned int             l_ex_holders;
	struct ocfs2_dlm_lksb    l_lksb;

	int                      l_requested;
	int                      l_blocking;

	wait_queue_head_t        l_event;

	struct work_struct       l_work;
};

extern struct workqueue_struct *user_dlm_worker;

void user_dlm_lock_res_init(struct user_lock_res *lockres,
			    struct dentry *dentry);
int user_dlm_destroy_lock(struct user_lock_res *lockres);
int user_dlm_cluster_lock(struct user_lock_res *lockres,
			  int level,
			  int lkm_flags);
void user_dlm_cluster_unlock(struct user_lock_res *lockres,
			     int level);
void user_dlm_write_lvb(struct inode *inode,
			const char *val,
			unsigned int len);
bool user_dlm_read_lvb(struct inode *inode, char *val);
struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
void user_dlm_set_locking_protocol(void);

struct dlmfs_inode_private {
	struct ocfs2_cluster_connection	*ip_conn;

	struct user_lock_res ip_lockres; /* unused for directories. */
	struct inode         *ip_parent;

	struct inode         ip_vfs_inode;
};

static inline struct dlmfs_inode_private *
DLMFS_I(struct inode *inode)
{
        return container_of(inode,
			    struct dlmfs_inode_private,
			    ip_vfs_inode);
}

struct dlmfs_filp_private {
	int                  fp_lock_level;
};

#define DLMFS_MAGIC	0x76a9f425

#endif /* USERDLM_H */

Annotation

Implementation Notes