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inode.h
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inode.h
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#ifndef FS_INODE_H
#define FS_INODE_H
#include <sys/types.h>
#include "misc.h"
#include "util/list.h"
#include "util/sync.h"
struct mount;
struct fd;
struct inode_data {
unsigned refcount;
ino_t number;
struct mount *mount;
struct list chain;
struct list posix_locks;
cond_t posix_unlock;
uint32_t socket_id;
lock_t lock;
};
struct inode_data *inode_get(struct mount *mount, ino_t inode);
void inode_retain(struct inode_data *inode);
void inode_release(struct inode_data *inode);
// generic_open must lock out anything trying to destroy an inode between
// opening the file and acquiring a reference to its inode. For this purpose
// only, the inodes_lock and inode_get_unlocked are made available. Think
// carefully before using them for anything else.
// mount->lock nests inside this.
// To quote @dril: i despise this lock. id love nothing more than to kick it
// through the wall and shatter it into 100 deadlocks. But i need it
extern lock_t inodes_lock;
struct inode_data *inode_get_unlocked(struct mount *mount, ino_t inode);
// calls mount->fs->inode_orphaned if this inode is orphaned, while holding indoes_lock
void inode_check_orphaned(struct mount *mount, ino_t ino);
// file locking stuff (maybe should go in kernel/calls.h?)
#define F_RDLCK_ 0
#define F_WRLCK_ 1
#define F_UNLCK_ 2
struct file_lock {
off_t_ start;
off_t_ end;
int type;
pid_t_ pid;
void *owner;
struct list locks;
};
struct flock_ {
word_t type;
word_t whence;
off_t_ start;
off_t_ len;
pid_t_ pid;
} __attribute__((packed));
struct flock32_ {
word_t type;
word_t whence;
dword_t start;
dword_t len;
pid_t_ pid;
} __attribute__((packed));
int fcntl_getlk(struct fd *fd, struct flock_ *flock);
// cmd should be either F_SETLK or F_SETLKW
int fcntl_setlk(struct fd *fd, struct flock_ *flock, bool block);
// locks the inode internally
void file_lock_remove_owned_by(struct fd *fd, void *owner);
#endif