fs/gfs2/quota.h

Source file repositories/reference/linux-study-clean/fs/gfs2/quota.h

File Facts

System
Linux kernel
Corpus path
fs/gfs2/quota.h
Extension
.h
Size
2009 bytes
Lines
69
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

#ifndef __QUOTA_DOT_H__
#define __QUOTA_DOT_H__

#include <linux/list_lru.h>

struct gfs2_inode;
struct gfs2_sbd;

#define NO_UID_QUOTA_CHANGE INVALID_UID
#define NO_GID_QUOTA_CHANGE INVALID_GID

int gfs2_qa_get(struct gfs2_inode *ip);
void gfs2_qa_put(struct gfs2_inode *ip);
int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
void gfs2_quota_unhold(struct gfs2_inode *ip);

int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
void gfs2_quota_unlock(struct gfs2_inode *ip);

int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
		     struct gfs2_alloc_parms *ap);
void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
		       kuid_t uid, kgid_t gid);

int gfs2_quota_sync(struct super_block *sb, int type);
int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid);

int gfs2_quota_init(struct gfs2_sbd *sdp);
void gfs2_quota_cleanup(struct gfs2_sbd *sdp);
int gfs2_quotad(void *data);

void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);

static inline int gfs2_quota_lock_check(struct gfs2_inode *ip,
					struct gfs2_alloc_parms *ap)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	int ret;

	ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
	if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF ||
	    capable(CAP_SYS_RESOURCE))
		return 0;
	ret = gfs2_quota_lock(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
	if (ret)
		return ret;
	if (sdp->sd_args.ar_quota == GFS2_QUOTA_ACCOUNT)
		return 0;
	ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid, ap);
	if (ret)
		gfs2_quota_unlock(ip);
	return ret;
}

extern const struct quotactl_ops gfs2_quotactl_ops;
int __init gfs2_qd_shrinker_init(void);
void gfs2_qd_shrinker_exit(void);
extern struct list_lru gfs2_qd_lru;

void __init gfs2_quota_hash_init(void);

#endif /* __QUOTA_DOT_H__ */

Annotation

Implementation Notes