linux/fs/xfs/xfs_qm.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_iwalk.h"
#include "xfs_quota.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_trans.h"
#include "xfs_trans_space.h"
#include "xfs_qm.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_error.h"
#include "xfs_ag.h"
#include "xfs_ialloc.h"
#include "xfs_log_priv.h"
#include "xfs_health.h"

/*
 * The global quota manager. There is only one of these for the entire
 * system, _not_ one per file system. XQM keeps track of the overall
 * quota functionality, including maintaining the freelist and hash
 * tables of dquots.
 */
STATIC int	xfs_qm_init_quotainos(struct xfs_mount *mp);
STATIC int	xfs_qm_init_quotainfo(struct xfs_mount *mp);

STATIC void	xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
STATIC void	xfs_qm_dqfree_one(struct xfs_dquot *dqp);
/*
 * We use the batch lookup interface to iterate over the dquots as it
 * currently is the only interface into the radix tree code that allows
 * fuzzy lookups instead of exact matches.  Holding the lock over multiple
 * operations is fine as all callers are used either during mount/umount
 * or quotaoff.
 */
#define XFS_DQ_LOOKUP_BATCH …

STATIC int
xfs_qm_dquot_walk(
	struct xfs_mount	*mp,
	xfs_dqtype_t		type,
	int			(*execute)(struct xfs_dquot *dqp, void *data),
	void			*data)
{ … }


/*
 * Purge a dquot from all tracking data structures and free it.
 */
STATIC int
xfs_qm_dqpurge(
	struct xfs_dquot	*dqp,
	void			*data)
{ … }

/*
 * Purge the dquot cache.
 */
static void
xfs_qm_dqpurge_all(
	struct xfs_mount	*mp)
{ … }

/*
 * Just destroy the quotainfo structure.
 */
void
xfs_qm_unmount(
	struct xfs_mount	*mp)
{ … }

/*
 * Called from the vfsops layer.
 */
void
xfs_qm_unmount_quotas(
	xfs_mount_t	*mp)
{ … }

STATIC int
xfs_qm_dqattach_one(
	struct xfs_inode	*ip,
	xfs_dqtype_t		type,
	bool			doalloc,
	struct xfs_dquot	**IO_idqpp)
{ … }

static bool
xfs_qm_need_dqattach(
	struct xfs_inode	*ip)
{ … }

/*
 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 * into account.
 * If @doalloc is true, the dquot(s) will be allocated if needed.
 * Inode may get unlocked and relocked in here, and the caller must deal with
 * the consequences.
 */
int
xfs_qm_dqattach_locked(
	xfs_inode_t	*ip,
	bool		doalloc)
{ … }

int
xfs_qm_dqattach(
	struct xfs_inode	*ip)
{ … }

/*
 * Release dquots (and their references) if any.
 * The inode should be locked EXCL except when this's called by
 * xfs_ireclaim.
 */
void
xfs_qm_dqdetach(
	xfs_inode_t	*ip)
{ … }

struct xfs_qm_isolate { … };

static enum lru_status
xfs_qm_dquot_isolate(
	struct list_head	*item,
	struct list_lru_one	*lru,
	spinlock_t		*lru_lock,
	void			*arg)
		__releases(lru_lock) __acquires(lru_lock)
{ … }

static unsigned long
xfs_qm_shrink_scan(
	struct shrinker		*shrink,
	struct shrink_control	*sc)
{ … }

static unsigned long
xfs_qm_shrink_count(
	struct shrinker		*shrink,
	struct shrink_control	*sc)
{ … }

STATIC void
xfs_qm_set_defquota(
	struct xfs_mount	*mp,
	xfs_dqtype_t		type,
	struct xfs_quotainfo	*qinf)
{ … }

/* Initialize quota time limits from the root dquot. */
static void
xfs_qm_init_timelimits(
	struct xfs_mount	*mp,
	xfs_dqtype_t		type)
{ … }

/*
 * This initializes all the quota information that's kept in the
 * mount structure
 */
STATIC int
xfs_qm_init_quotainfo(
	struct xfs_mount	*mp)
{ … }

/*
 * Gets called when unmounting a filesystem or when all quotas get
 * turned off.
 * This purges the quota inodes, destroys locks and frees itself.
 */
void
xfs_qm_destroy_quotainfo(
	struct xfs_mount	*mp)
{ … }

/*
 * Create an inode and return with a reference already taken, but unlocked
 * This is how we create quota inodes
 */
STATIC int
xfs_qm_qino_alloc(
	struct xfs_mount	*mp,
	struct xfs_inode	**ipp,
	unsigned int		flags)
{ … }


STATIC void
xfs_qm_reset_dqcounts(
	struct xfs_mount	*mp,
	struct xfs_buf		*bp,
	xfs_dqid_t		id,
	xfs_dqtype_t		type)
{ … }

STATIC int
xfs_qm_reset_dqcounts_all(
	struct xfs_mount	*mp,
	xfs_dqid_t		firstid,
	xfs_fsblock_t		bno,
	xfs_filblks_t		blkcnt,
	xfs_dqtype_t		type,
	struct list_head	*buffer_list)
{ … }

/*
 * Iterate over all allocated dquot blocks in this quota inode, zeroing all
 * counters for every chunk of dquots that we find.
 */
STATIC int
xfs_qm_reset_dqcounts_buf(
	struct xfs_mount	*mp,
	struct xfs_inode	*qip,
	xfs_dqtype_t		type,
	struct list_head	*buffer_list)
{ … }

/*
 * Called by dqusage_adjust in doing a quotacheck.
 *
 * Given the inode, and a dquot id this updates both the incore dqout as well
 * as the buffer copy. This is so that once the quotacheck is done, we can
 * just log all the buffers, as opposed to logging numerous updates to
 * individual dquots.
 */
STATIC int
xfs_qm_quotacheck_dqadjust(
	struct xfs_inode	*ip,
	xfs_dqtype_t		type,
	xfs_qcnt_t		nblks,
	xfs_qcnt_t		rtblks)
{ … }

/*
 * callback routine supplied to bulkstat(). Given an inumber, find its
 * dquots and update them to account for resources taken by that inode.
 */
/* ARGSUSED */
STATIC int
xfs_qm_dqusage_adjust(
	struct xfs_mount	*mp,
	struct xfs_trans	*tp,
	xfs_ino_t		ino,
	void			*data)
{ … }

STATIC int
xfs_qm_flush_one(
	struct xfs_dquot	*dqp,
	void			*data)
{ … }

/*
 * Walk thru all the filesystem inodes and construct a consistent view
 * of the disk quota world. If the quotacheck fails, disable quotas.
 */
STATIC int
xfs_qm_quotacheck(
	xfs_mount_t	*mp)
{ … }

/*
 * This is called from xfs_mountfs to start quotas and initialize all
 * necessary data structures like quotainfo.  This is also responsible for
 * running a quotacheck as necessary.  We are guaranteed that the superblock
 * is consistently read in at this point.
 *
 * If we fail here, the mount will continue with quota turned off. We don't
 * need to inidicate success or failure at all.
 */
void
xfs_qm_mount_quotas(
	struct xfs_mount	*mp)
{ … }

/*
 * This is called after the superblock has been read in and we're ready to
 * iget the quota inodes.
 */
STATIC int
xfs_qm_init_quotainos(
	xfs_mount_t	*mp)
{ … }

STATIC void
xfs_qm_destroy_quotainos(
	struct xfs_quotainfo	*qi)
{ … }

STATIC void
xfs_qm_dqfree_one(
	struct xfs_dquot	*dqp)
{ … }

/* --------------- utility functions for vnodeops ---------------- */


/*
 * Given an inode, a uid, gid and prid make sure that we have
 * allocated relevant dquot(s) on disk, and that we won't exceed inode
 * quotas by creating this file.
 * This also attaches dquot(s) to the given inode after locking it,
 * and returns the dquots corresponding to the uid and/or gid.
 *
 * in	: inode (unlocked)
 * out	: udquot, gdquot with references taken and unlocked
 */
int
xfs_qm_vop_dqalloc(
	struct xfs_inode	*ip,
	kuid_t			uid,
	kgid_t			gid,
	prid_t			prid,
	uint			flags,
	struct xfs_dquot	**O_udqpp,
	struct xfs_dquot	**O_gdqpp,
	struct xfs_dquot	**O_pdqpp)
{ … }

/*
 * Actually transfer ownership, and do dquot modifications.
 * These were already reserved.
 */
struct xfs_dquot *
xfs_qm_vop_chown(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	struct xfs_dquot	**IO_olddq,
	struct xfs_dquot	*newdq)
{ … }

int
xfs_qm_vop_rename_dqattach(
	struct xfs_inode	**i_tab)
{ … }

void
xfs_qm_vop_create_dqattach(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	struct xfs_dquot	*udqp,
	struct xfs_dquot	*gdqp,
	struct xfs_dquot	*pdqp)
{ … }

/* Decide if this inode's dquot is near an enforcement boundary. */
bool
xfs_inode_near_dquot_enforcement(
	struct xfs_inode	*ip,
	xfs_dqtype_t		type)
{ … }