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.
- Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/module.hlinux/fs.hlinux/types.hlinux/workqueue.h
Detected Declarations
struct user_lock_resstruct dlmfs_inode_privatestruct dlmfs_filp_privatefunction DLMFS_I
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
- Immediate include surface: `linux/module.h`, `linux/fs.h`, `linux/types.h`, `linux/workqueue.h`.
- Detected declarations: `struct user_lock_res`, `struct dlmfs_inode_private`, `struct dlmfs_filp_private`, `function DLMFS_I`.
- Atlas domain: Core OS / VFS And Filesystem Core.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.