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linux/fs/xfs/xfs_quota.h
Christoph Hellwig cc3c92e7e7 xfs: xfs_quota_unreserve_blkres can't fail 
Unreserving quotas can't fail due to quota limits, and we'll notice a
shut down file system a bit later in all the callers anyway.  Return
void and remove the error checking and propagation in the callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
2024-05-03 11:15:03 +05:30

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#ifndef __XFS_QUOTA_H__
#define __XFS_QUOTA_H__
#include "xfs_quota_defs.h"
/*
* Kernel only quota definitions and functions
*/
struct xfs_trans;
struct xfs_buf;
/*
* This check is done typically without holding the inode lock;
* that may seem racy, but it is harmless in the context that it is used.
* The inode cannot go inactive as long a reference is kept, and
* therefore if dquot(s) were attached, they'll stay consistent.
* If, for example, the ownership of the inode changes while
* we didn't have the inode locked, the appropriate dquot(s) will be
* attached atomically.
*/
#define XFS_NOT_DQATTACHED(mp, ip) \
((XFS_IS_UQUOTA_ON(mp) && (ip)->i_udquot == NULL) || \
(XFS_IS_GQUOTA_ON(mp) && (ip)->i_gdquot == NULL) || \
(XFS_IS_PQUOTA_ON(mp) && (ip)->i_pdquot == NULL))
#define XFS_QM_NEED_QUOTACHECK(mp) \
((XFS_IS_UQUOTA_ON(mp) && \
(mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) || \
(XFS_IS_GQUOTA_ON(mp) && \
(mp->m_sb.sb_qflags & XFS_GQUOTA_CHKD) == 0) || \
(XFS_IS_PQUOTA_ON(mp) && \
(mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))
static inline uint
xfs_quota_chkd_flag(
xfs_dqtype_t type)
{
switch (type) {
case XFS_DQTYPE_USER:
return XFS_UQUOTA_CHKD;
case XFS_DQTYPE_GROUP:
return XFS_GQUOTA_CHKD;
case XFS_DQTYPE_PROJ:
return XFS_PQUOTA_CHKD;
default:
return 0;
}
}
/*
* The structure kept inside the xfs_trans_t keep track of dquot changes
* within a transaction and apply them later.
*/
struct xfs_dqtrx {
struct xfs_dquot *qt_dquot; /* the dquot this refers to */
uint64_t qt_blk_res; /* blks reserved on a dquot */
int64_t qt_bcount_delta; /* dquot blk count changes */
int64_t qt_delbcnt_delta; /* delayed dquot blk count changes */
uint64_t qt_rtblk_res; /* # blks reserved on a dquot */
uint64_t qt_rtblk_res_used;/* # blks used from reservation */
int64_t qt_rtbcount_delta;/* dquot realtime blk changes */
int64_t qt_delrtb_delta; /* delayed RT blk count changes */
uint64_t qt_ino_res; /* inode reserved on a dquot */
uint64_t qt_ino_res_used; /* inodes used from the reservation */
int64_t qt_icount_delta; /* dquot inode count changes */
};
enum xfs_apply_dqtrx_type {
XFS_APPLY_DQTRX_COMMIT = 0,
XFS_APPLY_DQTRX_UNRESERVE,
};
/*
* Parameters for applying dqtrx changes to a dquot. The hook function arg
* parameter is enum xfs_apply_dqtrx_type.
*/
struct xfs_apply_dqtrx_params {
uintptr_t tx_id;
xfs_ino_t ino;
xfs_dqtype_t q_type;
xfs_dqid_t q_id;
};
#ifdef CONFIG_XFS_QUOTA
extern void xfs_trans_dup_dqinfo(struct xfs_trans *, struct xfs_trans *);
extern void xfs_trans_free_dqinfo(struct xfs_trans *);
extern void xfs_trans_mod_dquot_byino(struct xfs_trans *, struct xfs_inode *,
uint, int64_t);
extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
extern void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *);
int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp, struct xfs_inode *ip,
int64_t dblocks, int64_t rblocks, bool force);
extern int xfs_trans_reserve_quota_bydquots(struct xfs_trans *,
struct xfs_mount *, struct xfs_dquot *,
struct xfs_dquot *, struct xfs_dquot *, int64_t, long, uint);
int xfs_trans_reserve_quota_icreate(struct xfs_trans *tp,
struct xfs_dquot *udqp, struct xfs_dquot *gdqp,
struct xfs_dquot *pdqp, int64_t dblocks);
extern int xfs_qm_vop_dqalloc(struct xfs_inode *, kuid_t, kgid_t,
prid_t, uint, struct xfs_dquot **, struct xfs_dquot **,
struct xfs_dquot **);
extern void xfs_qm_vop_create_dqattach(struct xfs_trans *, struct xfs_inode *,
struct xfs_dquot *, struct xfs_dquot *, struct xfs_dquot *);
extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
extern struct xfs_dquot *xfs_qm_vop_chown(struct xfs_trans *,
struct xfs_inode *, struct xfs_dquot **, struct xfs_dquot *);
extern int xfs_qm_dqattach(struct xfs_inode *);
extern int xfs_qm_dqattach_locked(struct xfs_inode *ip, bool doalloc);
extern void xfs_qm_dqdetach(struct xfs_inode *);
extern void xfs_qm_dqrele(struct xfs_dquot *);
extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
extern void xfs_qm_mount_quotas(struct xfs_mount *);
extern void xfs_qm_unmount(struct xfs_mount *);
extern void xfs_qm_unmount_quotas(struct xfs_mount *);
bool xfs_inode_near_dquot_enforcement(struct xfs_inode *ip, xfs_dqtype_t type);
# ifdef CONFIG_XFS_LIVE_HOOKS
void xfs_trans_mod_ino_dquot(struct xfs_trans *tp, struct xfs_inode *ip,
struct xfs_dquot *dqp, unsigned int field, int64_t delta);
struct xfs_quotainfo;
struct xfs_dqtrx_hook {
struct xfs_hook mod_hook;
struct xfs_hook apply_hook;
};
void xfs_dqtrx_hook_disable(void);
void xfs_dqtrx_hook_enable(void);
int xfs_dqtrx_hook_add(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
void xfs_dqtrx_hook_del(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
void xfs_dqtrx_hook_setup(struct xfs_dqtrx_hook *hook, notifier_fn_t mod_fn,
notifier_fn_t apply_fn);
# else
# define xfs_trans_mod_ino_dquot(tp, ip, dqp, field, delta) \
xfs_trans_mod_dquot((tp), (dqp), (field), (delta))
# endif /* CONFIG_XFS_LIVE_HOOKS */
#else
static inline int
xfs_qm_vop_dqalloc(struct xfs_inode *ip, kuid_t kuid, kgid_t kgid,
prid_t prid, uint flags, struct xfs_dquot **udqp,
struct xfs_dquot **gdqp, struct xfs_dquot **pdqp)
{
*udqp = NULL;
*gdqp = NULL;
*pdqp = NULL;
return 0;
}
#define xfs_trans_dup_dqinfo(tp, tp2)
#define xfs_trans_free_dqinfo(tp)
static inline void xfs_trans_mod_dquot_byino(struct xfs_trans *tp,
struct xfs_inode *ip, uint field, int64_t delta)
{
}
#define xfs_trans_apply_dquot_deltas(tp)
#define xfs_trans_unreserve_and_mod_dquots(tp)
static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,
struct xfs_inode *ip, int64_t dblocks, int64_t rblocks,
bool force)
{
return 0;
}
static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
struct xfs_mount *mp, struct xfs_dquot *udqp,
struct xfs_dquot *gdqp, struct xfs_dquot *pdqp,
int64_t nblks, long nions, uint flags)
{
return 0;
}
static inline int
xfs_trans_reserve_quota_icreate(struct xfs_trans *tp, struct xfs_dquot *udqp,
struct xfs_dquot *gdqp, struct xfs_dquot *pdqp, int64_t dblocks)
{
return 0;
}
#define xfs_qm_vop_create_dqattach(tp, ip, u, g, p)
#define xfs_qm_vop_rename_dqattach(it) (0)
#define xfs_qm_vop_chown(tp, ip, old, new) (NULL)
#define xfs_qm_dqattach(ip) (0)
#define xfs_qm_dqattach_locked(ip, fl) (0)
#define xfs_qm_dqdetach(ip)
#define xfs_qm_dqrele(d) do { (d) = (d); } while(0)
#define xfs_qm_statvfs(ip, s) do { } while(0)
#define xfs_qm_newmount(mp, a, b) (0)
#define xfs_qm_mount_quotas(mp)
#define xfs_qm_unmount(mp)
#define xfs_qm_unmount_quotas(mp)
#define xfs_inode_near_dquot_enforcement(ip, type) (false)
# ifdef CONFIG_XFS_LIVE_HOOKS
# define xfs_dqtrx_hook_enable() ((void)0)
# define xfs_dqtrx_hook_disable() ((void)0)
# endif /* CONFIG_XFS_LIVE_HOOKS */
#endif /* CONFIG_XFS_QUOTA */
static inline int
xfs_quota_reserve_blkres(struct xfs_inode *ip, int64_t blocks)
{
return xfs_trans_reserve_quota_nblks(NULL, ip, blocks, 0, false);
}
static inline void
xfs_quota_unreserve_blkres(struct xfs_inode *ip, uint64_t blocks)
{
/* don't return an error as unreserving quotas can't fail */
xfs_quota_reserve_blkres(ip, -(int64_t)blocks);
}
extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
#endif /* __XFS_QUOTA_H__ */
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