File: [Development] / xfs-linux / Attic / xfs_qm.c (download)
Revision 1.4, Wed May 29 17:16:09 1996 UTC (21 years, 5 months ago) by sup
Branch: MAIN
Changes since 1.3: +105 -43
lines
Restructured qm_dqpurge_all, minor bug fixes, cleaned up the quotaoff path.
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#ident "$Revision: 1.4 $"
#ifdef SIM
#define _KERNEL 1
#endif
#include <sys/param.h>
#include <sys/sysinfo.h>
#include <sys/buf.h>
#include <sys/ksa.h>
#include <sys/vnode.h>
#include <sys/pfdat.h>
#include <sys/uuid.h>
#include <sys/capability.h>
#ifdef SIM
#undef _KERNEL
#endif
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/cmn_err.h>
#include <sys/cred.h>
#include <sys/vfs.h>
#include <sys/uuid.h>
#include <sys/atomic_ops.h>
#ifdef SIM
#include <bstring.h>
#else
#include <sys/systm.h>
#include <sys/ktrace.h>
#endif
#include <limits.h>
#include "xfs_macros.h"
#include "xfs_types.h"
#include <sys/quota.h>
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_btree.h"
#include "xfs_bmap.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode_item.h"
#include "xfs_buf_item.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_trans_priv.h"
#include "xfs_bit.h"
#include "xfs_clnt.h"
#include "xfs_quota.h"
#include "xfs_dquot.h"
#include "xfs_qm.h"
#include "xfs_quota_priv.h"
#ifdef SIM
#define _KERNEL 1
#endif
#include "xfs_itable.h"
#ifdef SIM
#undef _KERNEL
#include "sim.h"
#include <stdio.h>
#include <stdlib.h>
#endif
extern int ncsize;
struct xfs_qm *G_xqm = NULL;
extern int xfs_dir_ialloc(xfs_trans_t **tpp, xfs_inode_t *dp, mode_t mode,
nlink_t nlink, dev_t rdev, cred_t *credp,
prid_t prid, xfs_inode_t **ipp,
int *committed);
extern time_t time;
typedef int (*xfs_dqbuf_iter) (xfs_mount_t *mp, buf_t *);
STATIC void xfs_qm_list_init(xfs_dqlist_t *, char *, int);
STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
STATIC int xfs_qm_dqget_noattach(xfs_inode_t *, xfs_dquot_t **,
xfs_dquot_t **);
STATIC int xfs_qm_qino_alloc(xfs_mount_t *, xfs_inode_t **,
xfs_ino_t *, __int64_t);
STATIC int xfs_qm_reset_dqcounts(xfs_mount_t *, buf_t *);
STATIC int xfs_qm_dqiter_bufs(xfs_mount_t *, xfs_fsblock_t,
xfs_filblks_t, xfs_dqbuf_iter, uint);
STATIC int xfs_qm_dqiterate(xfs_mount_t *, xfs_inode_t *, uint,
xfs_dqbuf_iter);
STATIC void xfs_qm_quotacheck_dqadjust(xfs_dquot_t *, xfs_qcnt_t);
STATIC int xfs_qm_dqusage_adjust(xfs_mount_t *, xfs_trans_t *, xfs_ino_t,
void *, daddr_t);
STATIC int xfs_qm_quotacheck(xfs_mount_t *);
STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC int xfs_qm_shake_freelist(int);
STATIC int xfs_qm_shake(int);
STATIC xfs_dquot_t *xfs_qm_dqreclaim_one(void);
STATIC int xfs_qm_dqattach_one(xfs_inode_t *, xfs_dqid_t, uint, uint, uint,
xfs_dquot_t *, xfs_dquot_t **);
STATIC void xfs_qm_dqattach_projhint(xfs_dquot_t *, xfs_dquot_t *, uint);
STATIC void xfs_qm_hold_quotafs_ref(struct xfs_mount *);
STATIC void xfs_qm_rele_quotafs_ref(struct xfs_mount *);
STATIC void xfs_qm_dettach_pdquots(xfs_mount_t *);
#ifdef DEBUG
extern mutex_t qcheck_lock;
#endif
/*
* Initialize the XQM structure.
* Note that there is only one quota manager for the entire kernel,
* not one each per file system.
*/
struct xfs_qm *
xfs_qm_init()
{
xfs_qm_t *xqm;
int hsize, i;
xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
ASSERT(xqm);
/*
* initialize the dquot hash tables .
*/
hsize = (ncsize < XFS_QM_NCSIZE_THRESHOLD) ?
XFS_QM_HASHSIZE_LOW : XFS_QM_HASHSIZE_HIGH;
xqm->qm_dqhashmask = hsize - 1;
/*
* XXXsup We can keep reference counts on user and proj quotas
* inside XQM separately, and avoid having two hashtables even
* when only one 'type' is active in the system.
*/
xqm->qm_usr_dqhtable = (xfs_dqhash_t *)kmem_zalloc(hsize *
sizeof(xfs_dqhash_t),
KM_SLEEP);
xqm->qm_prj_dqhtable = (xfs_dqhash_t *)kmem_zalloc(hsize *
sizeof(xfs_dqhash_t),
KM_SLEEP);
ASSERT(xqm->qm_usr_dqhtable != NULL);
ASSERT(xqm->qm_prj_dqhtable != NULL);
for (i = 0; i < hsize; i++) {
xfs_qm_list_init(&(xqm->qm_usr_dqhtable[i]), "uxdqh", i);
xfs_qm_list_init(&(xqm->qm_prj_dqhtable[i]), "pxdqh", i);
}
/*
* freelist of all dquots of all file systems
*/
xfs_qm_freelist_init(&(xqm->qm_dqfreelist));
/*
* dquot zone. we register our own shaked callback.
*/
xqm->qm_dqzone = kmem_zone_init(sizeof(xfs_dquot_t), "dquots");
shake_register(SHAKEMGR_MEMORY, xfs_qm_shake);
/*
* The t_dqinfo portion of transactions.
*/
xqm->qm_dqtrxzone = kmem_zone_init(sizeof(xfs_dquot_acct_t), "dqtrx");
xqm->qm_totaldquots = 0;
xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
xqm->qm_nrefs = 0;
#ifdef DEBUG
mutex_init(&qcheck_lock, MUTEX_DEFAULT, "qchk");
#endif
return (xqm);
}
/*
* Destroy the global quota manager when its reference count goes to zero.
*/
void
xfs_qm_destroy(
struct xfs_qm *xqm)
{
int hsize, i;
ASSERT(xqm != NULL);
ASSERT(xqm->qm_nrefs == 0);
hsize = xqm->qm_dqhashmask + 1;
for (i = 0; i < hsize; i++) {
xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));
xfs_qm_list_destroy(&(xqm->qm_prj_dqhtable[i]));
}
kmem_free(xqm->qm_usr_dqhtable, hsize * sizeof(xfs_dqhash_t));
kmem_free(xqm->qm_prj_dqhtable, hsize * sizeof(xfs_dqhash_t));
xqm->qm_usr_dqhtable = NULL;
xqm->qm_prj_dqhtable = NULL;
xqm->qm_dqhashmask = 0;
xfs_qm_freelist_destroy(&(xqm->qm_dqfreelist));
#ifdef DEBUG
mutex_destroy(&qcheck_lock);
#endif
kmem_free(xqm, sizeof(xfs_qm_t));
}
/*
* Called at mount time to let XQM know that another file system is
* starting quotas. This isn't crucial information as the individual mount
* structures are pretty independent, but it helps the XQM keep a
* global view of what's going on.
*/
/* ARGSUSED */
STATIC void
xfs_qm_hold_quotafs_ref(
struct xfs_mount *mp)
{
ASSERT(G_xqm);
/*
* We can keep a list of all filesystems with quotas mounted for
* debugging and statistical purposes, but ...
* Just take a reference and get out.
*/
XFS_QM_HOLD(G_xqm);
}
/*
* Release the reference that a filesystem took at mount time,
* so that we know when we need to destroy the entire quota manager.
*/
/* ARGSUSED */
STATIC void
xfs_qm_rele_quotafs_ref(
struct xfs_mount *mp)
{
xfs_dquot_t *dqp, *nextdqp;
ASSERT(G_xqm);
ASSERT(G_xqm->qm_nrefs > 0);
XFS_QM_RELE(G_xqm);
/*
* Go thru the freelist and destroy all inactive dquots.
*/
xfs_qm_freelist_lock(G_xqm);
#if 0
xfs_qm_freelist_print(&(G_xqm->qm_dqfreelist),
"@@@@@++ Free list (Before rele-quotafs-ref) @@@@@+");
#endif
for (dqp = G_xqm->qm_dqfreelist.qh_next;
dqp != (xfs_dquot_t *)&(G_xqm->qm_dqfreelist); ) {
xfs_dqlock(dqp);
nextdqp = dqp->dq_flnext;
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(dqp->MPL_PREVP == NULL);
#if 0
printf("Inactive dqdestroy 0x%x\n", dqp);
#endif
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
xfs_qm_dqdestroy(dqp);
} else {
xfs_dqunlock(dqp);
}
dqp = nextdqp;
}
xfs_qm_freelist_unlock(G_xqm);
/*
* Destroy the entire XQM. If somebody mounts with quotaon, this'll
* be restarted. XXXsup this is racey.. Somebody can be mounting
* at the same time...
*/
if (G_xqm->qm_nrefs == 0) {
xfs_qm_destroy(G_xqm);
G_xqm = NULL;
}
}
/*
* This is called at mount time from xfs_cmountfs in vfsops.c to initialize the
* quotainfo structure and start the global quotamanager (G_xqm) if it hasn't
* already.
* Note that the superblock has not been read in yet. This is before
* xfs_mount_int() gets called.
*/
void
xfs_qm_mount_quotainit(
xfs_mount_t *mp,
uint flags)
{
/*
* User or project quotas has to be on, or we shouldn't be here
*/
ASSERT(flags & (XFSMNT_UQUOTA | XFSMNT_PQUOTA));
if (G_xqm == NULL) {
if ((G_xqm = xfs_qm_init()) == NULL)
return;
}
/*
* Initialize the flags in the mount structure.
* From this point onwards we look at m_flags to figure out if quotas
* is ON/OFF, etc.
* Note that we enforce nothing if accounting is off.
* ie. XFSMNT_*QUOTA must be ON for XFSMNT_*QUOTAENF.
* It isn't necessary to take the quotaoff lock to do this; this is
* called from mount.
*/
if (flags & XFSMNT_UQUOTA) {
mp->m_flags |= (XFS_MOUNT_UDQ_ACCT | XFS_MOUNT_UDQ_ACTIVE);
if (flags & XFSMNT_UQUOTAENF)
mp->m_flags |= XFS_MOUNT_UDQ_ENFD;
}
if (flags & XFSMNT_PQUOTA) {
mp->m_flags |= (XFS_MOUNT_PDQ_ACCT | XFS_MOUNT_PDQ_ACTIVE);
if (flags & XFSMNT_PQUOTAENF)
mp->m_flags |= XFS_MOUNT_PDQ_ENFD;
}
}
/*
* Just destroy the quotainfo structure.
*/
void
xfs_qm_unmount_quotadestroy(
xfs_mount_t *mp)
{
xfs_qm_destroy_quotainfo(mp);
}
/*
* This is called from xfs_mount_int to start quotas and initialize all
* necessary data structures like quotainfo, and in the rootfs's case
* G_xqm. This is also responsible for running a quotacheck as necessary.
* We are guaranteed that the superblock is consistently read in at this point.
*/
int
xfs_qm_mount_quotas(
xfs_mount_t *mp)
{
int s;
int error;
uint sbf;
extern dev_t rootdev;
error = 0;
/*
* If a non-root file system had quotas running earlier, but decided
* to mount without -o quota/pquota options, we revoke the quotachecked
* license, and bail out.
*/
if ((!(XFS_IS_QUOTA_ON(mp))) &&
(mp->m_dev != rootdev) &&
(mp->m_sb.sb_qflags & (XFS_MOUNT_UDQ_ACCT|XFS_MOUNT_PDQ_ACCT))) {
mp->m_flags &= ~(XFS_MOUNT_QUOTA_MASK);
goto write_changes;
}
/*
* If this is the root file system, mark flags in mount struct first.
* We couldn't do this earlier because we didn't have the superblock
* read in.
*/
if (mp->m_dev == rootdev) {
ASSERT(mp->m_sb.sb_versionnum >= XFS_SB_VERSION_HASQUOTA);
ASSERT(mp->m_sb.sb_qflags &
(XFS_MOUNT_UDQ_ACCT|XFS_MOUNT_PDQ_ACCT));
if (G_xqm == NULL) {
if ((G_xqm = xfs_qm_init()) == NULL) {
mp->m_flags &= ~(XFS_MOUNT_QUOTA_MASK);
error = EINVAL;
goto write_changes;
}
}
mp->m_flags &= ~(XFS_MOUNT_QUOTA_MASK);
mp->m_flags |= mp->m_sb.sb_qflags & XFS_MOUNT_QUOTA_ALL;
if (mp->m_flags & XFS_MOUNT_UDQ_ACCT)
mp->m_flags |= XFS_MOUNT_UDQ_ACTIVE;
if (mp->m_flags & XFS_MOUNT_PDQ_ACCT)
mp->m_flags |= XFS_MOUNT_PDQ_ACTIVE;
/*
* The quotainode of the root file system may or may not
* exist at this point.
*/
}
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* Allocate the quotainfo structure inside the mount struct, and
* and create quotainode(s), and change/rev superblock if necessary.
*/
if (error = xfs_qm_init_quotainfo(mp)) {
#ifdef QUOTADEBUG
cmn_err(CE_NOTE, "Error in quotainfo init!");
#endif
/*
* We must turn off quotas.
*/
ASSERT(mp->m_quotainfo == NULL);
ASSERT(G_xqm != NULL);
mp->m_flags &= ~(XFS_MOUNT_QUOTA_MASK);
goto write_changes;
}
/*
* If any of the quotas isn't consistent,
* do a quotacheck.
*/
if ((XFS_IS_UQUOTA_ON(mp) &&
(mp->m_sb.sb_qflags & XFS_MOUNT_UDQ_CHKD) == 0) ||
(XFS_IS_PQUOTA_ON(mp) &&
(mp->m_sb.sb_qflags & XFS_MOUNT_PDQ_CHKD) == 0)) {
#ifdef DEBUG
cmn_err(CE_NOTE, "Doing a quotacheck. Please wait.");
#endif
if (error = xfs_qm_quotacheck(mp)) {
cmn_err(CE_WARN, "Quotacheck unsuccessful (Error %d): "
"Disabling quotas.",
error);
/*
* We must turn off quotas.
*/
ASSERT(mp->m_quotainfo != NULL);
ASSERT(G_xqm != NULL);
xfs_qm_destroy_quotainfo(mp);
mp->m_flags &= ~(XFS_MOUNT_QUOTA_MASK);
goto write_changes;
}
#ifdef DEBUG
cmn_err(CE_NOTE, "Done quotacheck.");
#endif
}
write_changes:
/*
* We actually don't have to acquire the SB_LOCK at all.
* This can only be called from mount, and that's single threaded. XXX
*/
s = XFS_SB_LOCK(mp);
sbf = mp->m_sb.sb_qflags;
mp->m_sb.sb_qflags = mp->m_flags & XFS_MOUNT_QUOTA_ALL;
XFS_SB_UNLOCK(mp, s);
if (sbf != (mp->m_flags & XFS_MOUNT_QUOTA_ALL)) {
if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
/*
* We could only have been turning quotas off.
* We aren't in very good shape actually because
* the incore structures are convinced that quotas are
* off, but the on disk superblock doesn't know that !
*/
ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
cmn_err(CE_ALERT,
"XFS mount_quotas: Superblock update failed!"
);
}
}
return XFS_ERROR(error);
}
/*
* Called from the vfsops layer.
*/
void
xfs_qm_unmount_quotas(
xfs_mount_t *mp)
{
xfs_inode_t *uqp, *pqp;
/*
* Release the dquots that root inode, et al might be holding,
* before we flush quotas and blow away the quotainfo structure.
*/
if (mp->m_rootip->i_udquot || mp->m_rootip->i_pdquot)
xfs_qm_dqdettach_inode(mp->m_rootip);
if (mp->m_rbmip->i_udquot || mp->m_rbmip->i_pdquot)
xfs_qm_dqdettach_inode(mp->m_rbmip);
if (mp->m_rsumip->i_udquot || mp->m_rsumip->i_pdquot)
xfs_qm_dqdettach_inode(mp->m_rsumip);
/*
* Flush out the quota inodes.
*/
uqp = pqp = NULL;
if (mp->m_quotainfo) {
if ((uqp = mp->m_quotainfo->qi_uquotaip) != NULL)
XFS_DO_FLUSH_INODE(uqp);
if ((pqp = mp->m_quotainfo->qi_pquotaip) != NULL)
XFS_DO_FLUSH_INODE(pqp);
}
if (uqp) {
XFS_PURGE_INODE(XFS_ITOV(uqp));
mp->m_quotainfo->qi_uquotaip = NULL;
}
if (pqp) {
XFS_PURGE_INODE(XFS_ITOV(pqp));
mp->m_quotainfo->qi_pquotaip = NULL;
}
}
/*
* Flush all dquots of the given file system to disk. The dquots are
* _not_ purged from memory here.
*/
int
xfs_qm_dqflush_all(
xfs_mount_t *mp,
int flags)
{
int recl;
xfs_dquot_t *dqp;
#ifdef QUOTADEBUG
int temp = 0;
#endif
if (mp->m_quotainfo == NULL)
return (0);
again:
xfs_qm_mplist_lock(mp);
FOREACH_DQUOT_IN_MP(dqp, mp) {
xfs_dqlock(dqp);
if (! XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
xfs_dqtrace_entry(dqp, "FLUSHALL: DQDIRTY");
/* XXX a sentinel would be better */
recl = mp->QI_MPLRECLAIMS;
if (! xfs_qm_dqflock_nowait(dqp)) {
/*
* If we can't grab the flush lock then check
* to see if the dquot has been flushed delayed
* write. If so, grab its buffer and send it
* out immediately. We'll be able to acquire
* the flush lock when the I/O completes.
*/
xfs_qm_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write
*/
xfs_qm_mplist_unlock(mp);
xfs_qm_dqflush(dqp, flags);
xfs_dqunlock(dqp);
#ifdef QUOTADEBUG
temp++;
#endif
xfs_qm_mplist_lock(mp);
if (recl != mp->QI_MPLRECLAIMS) {
xfs_qm_mplist_unlock(mp);
/* XXX restart limit */
goto again;
}
}
#ifdef QUOTADEBUG
printf("Flushed %d dquot(s)\n", temp);
#endif
xfs_qm_mplist_unlock(mp);
/* return ! busy */
return (0);
}
/*
* Release the proj dquot pointers the user dquots may be
* carrying around as a hint. mplist is locked on entry and exit.
*/
STATIC void
xfs_qm_dettach_pdquots(
xfs_mount_t *mp)
{
xfs_dquot_t *dqp, *pdqp;
int nrecl;
again:
ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
dqp = mp->QI_MPLNEXT;
while (dqp) {
xfs_dqlock(dqp);
if (pdqp = dqp->q_pdquot) {
xfs_dqlock(pdqp);
dqp->q_pdquot = NULL;
}
xfs_dqunlock(dqp);
if (pdqp) {
/*
* Can't hold the mplist lock across a dqput.
* XXXmust convert to marker based iterations here.
*/
nrecl = mp->QI_MPLRECLAIMS;
xfs_qm_mplist_unlock(mp);
#if 0
printf("mplist PROJ RELE: dquot id = \'%d\' (%s), "
"nrefs %d\n",
(int)dqp->q_core.d_id,
DQFLAGTO_TYPESTR(dqp),
(int)dqp->q_nrefs);
#endif
xfs_qm_dqput(pdqp);
xfs_qm_mplist_lock(mp);
if (nrecl != mp->QI_MPLRECLAIMS)
goto again;
}
dqp = dqp->MPL_NEXT;
}
}
/*
* Go through all the incore dquots of this file system and take them
* of the mplist and hashlist, if the dquot type matches the dqtype
* parameter. This is used when turning off quota accounting for
* users and/or projects, as well as when the filesystem is unmounting.
*/
int
xfs_qm_dqpurge_all(
xfs_mount_t *mp,
uint flags) /* QUOTAOFF/UMOUNTING/UQUOTA/PQUOTA */
{
xfs_dquot_t *dqp;
uint dqtype;
int nrecl;
if (mp->m_quotainfo == NULL)
return (0);
dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
xfs_qm_mplist_lock(mp);
/*
* In the first pass through all incore dquots of this filesystem,
* we release the proj dquot pointers the user dquots may be
* carrying around as a hint. We need to do this irrespective of
* what's being turned off.
*/
xfs_qm_dettach_pdquots(mp);
again:
ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
/*
* Try to get rid of all of the unwanted dquots. The idea is to
* get them off mplist and hashlist, but leave them on freelist.
*/
dqp = mp->QI_MPLNEXT;
while (dqp) {
#if 0
printf("mplist: dquot id = \'%d\' (%s), nrefs %d\n",
(int)dqp->q_core.d_id,
DQFLAGTO_TYPESTR(dqp),
(int)dqp->q_nrefs);
#endif
/*
* It's OK to look at the type without taking dqlock here.
* We're holding the mplist lock here, and that's needed for
* a dqreclaim.
*/
if ((dqp->dq_flags & dqtype) == 0) {
dqp = dqp->MPL_NEXT;
continue;
}
if (! xfs_qm_dqhashlock_nowait(dqp)) {
nrecl = mp->QI_MPLRECLAIMS;
xfs_qm_mplist_unlock(mp);
XFS_DQ_HASH_LOCK(dqp->q_hash);
xfs_qm_mplist_lock(mp);
/*
* XXXTheoretically, we can get into a very long
* ping pong game here.
* No one can be adding dquots to the mplist at
* this point, but somebody might be taking things off.
*/
if (nrecl != mp->QI_MPLRECLAIMS) {
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
goto again;
}
}
/*
* Take the dquot off the mplist and hashlist. It may remain on
* freelist. This also returns a ptr to the next dquot on mplist.
*/
dqp = xfs_qm_dqpurge(dqp);
}
xfs_qm_mplist_unlock(mp);
#if 0
xfs_qm_freelist_print(&(G_xqm->qm_dqfreelist),
"@@@@@++ Free list (After dqpurge_all) @@@@@+");
#endif
return (0);
}
STATIC int
xfs_qm_dqattach_one(
xfs_inode_t *ip,
xfs_dqid_t id,
uint type,
uint doalloc,
uint dolock,
xfs_dquot_t *udqhint, /* hint */
xfs_dquot_t **IO_idqpp)
{
xfs_dquot_t *dqp;
int error;
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
error = 0;
/*
* See if we already have it in the inode itself. IO_idqpp is
* &i_udquot or &i_pdquot. This made the code look weird, but
* made the logic a lot simpler.
*/
if (dqp = *IO_idqpp) {
if (dolock)
xfs_dqlock(dqp);
xfs_dqtrace_entry(dqp, "DQATTACH: found in ip");
goto done;
}
/*
* udqhint is the i_udquot field in inode, and is non-NULL only
* when the type arg is XFS_DQ_PROJ. Its purpose is to save a
* lookup by dqid (xfs_qm_dqget) by caching a project dquot inside
* the user dquot.
*/
if (udqhint && !dolock)
xfs_dqlock(udqhint);
/*
* No need to take dqlock to look at the id.
* The ID can't change until it gets reclaimed, and it won't
* be reclaimed as long as we have a ref from inode and we hold
* the ilock.
*/
if (udqhint &&
(dqp = udqhint->q_pdquot) &&
(dqp->q_core.d_id == id)) {
ASSERT(XFS_DQ_IS_LOCKED(udqhint));
xfs_dqlock(dqp);
XFS_DQHOLD(dqp);
ASSERT(*IO_idqpp == NULL);
*IO_idqpp = dqp;
if (!dolock) {
xfs_dqunlock(dqp);
xfs_dqunlock(udqhint);
}
/* XXX XFSSTATS */
goto done;
}
/*
* We can't hold a dquot lock when we call the dqget code.
* We'll deadlock in no time, because of (not conforming to)
* lock ordering - the inodelock comes before any dquot lock,
* and we may drop and reacquire the ilock in xfs_qm_dqget().
*/
if (udqhint)
xfs_dqunlock(udqhint);
/*
* Find the dquot from somewhere. This bumps the
* reference count of dquot and returns it locked.
* This can return ENOENT if dquot didn't exist on
* disk and we didn't ask it to allocate;
* ESRCH if quotas got turned off suddenly.
*/
if (error = xfs_qm_dqget(ip->i_mount, ip, id, type, doalloc, &dqp)) {
if (error != ESRCH && error != ENOENT)
xfs_qm_force_quotaoff(ip->i_mount);
if (udqhint && dolock)
xfs_dqlock(udqhint);
goto done;
}
xfs_dqtrace_entry(dqp, "DQATTACH: found by dqget");
*IO_idqpp = dqp;
ASSERT(dqp);
ASSERT(XFS_DQ_IS_LOCKED(dqp));
if (! dolock) {
xfs_dqunlock(dqp);
if (udqhint)
ASSERT(! XFS_DQ_IS_LOCKED(udqhint));
goto done;
}
if (! udqhint)
goto done;
ASSERT(udqhint);
ASSERT(dolock);
ASSERT(! XFS_DQ_IS_LOCKED(udqhint));
ASSERT(XFS_DQ_IS_LOCKED(dqp));
if (! xfs_qm_dqlock_nowait(udqhint)) {
xfs_dqunlock(dqp);
xfs_dqlock(udqhint);
xfs_dqlock(dqp);
}
done:
#ifdef QUOTADEBUG
if (udqhint) {
if (dolock)
ASSERT(XFS_DQ_IS_LOCKED(udqhint));
else
ASSERT(! XFS_DQ_IS_LOCKED(udqhint));
}
if (! error) {
if (dolock)
ASSERT(XFS_DQ_IS_LOCKED(dqp));
else
ASSERT(! XFS_DQ_IS_LOCKED(dqp));
}
#endif
return (error);
}
/*
* Given a udquot and proj dquot, attach a ptr to the proj dquot in the
* udquot as a hint for future lookups. The idea sounds simple, but the
* execution isn't, because the udquot might have a proj dquot attached
* already and getting rid of that gets us into lock ordering contraints.
* The process is complicated more by the fact that the dquots may or may not
* be locked on entry.
*/
STATIC void
xfs_qm_dqattach_projhint(
xfs_dquot_t *udq,
xfs_dquot_t *pdq,
uint locked)
{
xfs_dquot_t *tmp;
#ifdef QUOTADEBUG
if (locked) {
ASSERT(XFS_DQ_IS_LOCKED(udq));
ASSERT(XFS_DQ_IS_LOCKED(pdq));
} else {
ASSERT(! XFS_DQ_IS_LOCKED(udq));
ASSERT(! XFS_DQ_IS_LOCKED(pdq));
}
#endif
if (! locked)
xfs_dqlock(udq);
if (tmp = udq->q_pdquot) {
if (tmp == pdq) {
if (! locked)
xfs_dqunlock(udq);
return;
}
udq->q_pdquot = NULL;
/*
* We can't keep any dqlocks when calling dqrele,
* because the freelist lock comes before dqlocks.
*/
xfs_dqunlock(udq);
if (locked)
xfs_dqunlock(pdq);
/*
* we took a hard reference once upon a time in dqget,
* so give it back when the udquot no longer points at it
* dqput() does the unlocking of the dquot.
*/
xfs_qm_dqrele(tmp);
ASSERT(! XFS_DQ_IS_LOCKED(udq));
ASSERT(! XFS_DQ_IS_LOCKED(pdq));
xfs_dqlock(udq);
xfs_dqlock(pdq);
} else {
ASSERT(XFS_DQ_IS_LOCKED(udq));
if (! locked) {
ASSERT(! XFS_DQ_IS_LOCKED(pdq));
xfs_dqlock(pdq);
}
}
ASSERT(XFS_DQ_IS_LOCKED(udq));
ASSERT(XFS_DQ_IS_LOCKED(pdq));
/*
* Somebody could have attached a pdquot here,
* when we dropped the uqlock. If so, just do nothing.
*/
if (udq->q_pdquot == NULL) {
XFS_DQHOLD(pdq);
udq->q_pdquot = pdq;
}
if (! locked) {
xfs_dqunlock(pdq);
xfs_dqunlock(udq);
}
}
/*
* Given a locked inode, attach dquot(s) to it, taking UQUOTAON / PQUOTAON
* in to account.
* If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
* If XFS_QMOPT_DQLOCK, the dquot(s) will be returned locked. This option pretty
* much made this code a complete mess, but it has been pretty useful.
* If XFS_QMOPT_ILOCKED, then inode sent is already locked EXCL.
* Inode may get unlocked and relocked in here, and the caller must deal with
* the consequences.
*/
int
xfs_qm_dqattach(
xfs_inode_t *ip,
uint flags)
{
int error;
xfs_mount_t *mp;
uint nquotas;
mp = ip->i_mount;
ASSERT(ip->i_ino != mp->m_sb.sb_uquotino &&
ip->i_ino != mp->m_sb.sb_pquotino);
#ifdef QUOTADEBUG
if (flags & XFS_QMOPT_ILOCKED)
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
#endif
nquotas = 0;
error = 0;
if (! (flags & XFS_QMOPT_ILOCKED))
xfs_ilock(ip, XFS_ILOCK_EXCL);
if (XFS_IS_UQUOTA_ON(mp)) {
if (error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
flags & XFS_QMOPT_DQALLOC,
flags & XFS_QMOPT_DQLOCK,
NULL, &ip->i_udquot))
goto done;
nquotas++;
}
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
if (XFS_IS_PQUOTA_ON(mp)) {
if (error = xfs_qm_dqattach_one(ip, ip->i_d.di_projid,
XFS_DQ_PROJ,
flags & XFS_QMOPT_DQALLOC,
flags & XFS_QMOPT_DQLOCK,
ip->i_udquot,
&ip->i_pdquot))
/*
* Don't worry about the udquot that we may have
* attached above. It'll get dettached, if not already.
*/
goto done;
nquotas++;
}
/*
* Attach this project quota to the user quota as a hint.
* This WON'T, in general, result in a thrash.
*/
if (nquotas == 2) {
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
ASSERT(ip->i_udquot);
ASSERT(ip->i_pdquot);
/*
* We may or may not have the i_udquot locked at this point,
* but this check is OK since we don't depend on the i_pdquot to
* be accurate 100% all the time. It is just a hint, and this
* will succeed in general.
*/
if (ip->i_udquot->q_pdquot == ip->i_pdquot)
goto done;
/*
* Attach i_pdquot to the pdquot hint inside the i_udquot.
*/
xfs_qm_dqattach_projhint(ip->i_udquot, ip->i_pdquot,
flags & XFS_QMOPT_DQLOCK);
}
done:
#ifdef QUOTADEBUG
if (! error) {
if (ip->i_udquot) {
if (flags & XFS_QMOPT_DQLOCK)
ASSERT(XFS_DQ_IS_LOCKED(ip->i_udquot));
else
ASSERT(! XFS_DQ_IS_LOCKED(ip->i_udquot));
}
if (ip->i_pdquot) {
if (flags & XFS_QMOPT_DQLOCK)
ASSERT(XFS_DQ_IS_LOCKED(ip->i_pdquot));
else
ASSERT(! XFS_DQ_IS_LOCKED(ip->i_pdquot));
}
if (XFS_IS_UQUOTA_ON(mp))
ASSERT(ip->i_udquot);
if (XFS_IS_PQUOTA_ON(mp))
ASSERT(ip->i_pdquot);
}
#endif
if (! (flags & XFS_QMOPT_ILOCKED))
xfs_iunlock(ip, XFS_ILOCK_EXCL);
#ifdef QUOTADEBUG
else
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
#endif
return (error);
}
/*
* Release dquots (and their references) if any.
* The inode should be locked EXCL except when this's called by
* xfs_ireclaim.
*/
void
xfs_qm_dqdettach_inode(
xfs_inode_t *ip)
{
ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_pquotino);
if (ip->i_udquot) {
xfs_qm_dqrele(ip->i_udquot);
ip->i_udquot = NULL;
}
if (ip->i_pdquot) {
xfs_qm_dqrele(ip->i_pdquot);
ip->i_pdquot = NULL;
}
}
int
xfs_qm_unmount(
xfs_mount_t *mp)
{
vnode_t *vp;
/* better to check mp->QI_UQIP than this * ??? */
if (XFS_IS_UQUOTA_ON(mp)) {
vp = XFS_ITOV(mp->QI_UQIP);
VN_RELE(vp);
if (vp->v_count > 1)
cmn_err(CE_WARN, "UQUOTA busy vp=0x%x count=%d\n",
vp, vp->v_count);
}
if (XFS_IS_PQUOTA_ON(mp)) {
vp = XFS_ITOV(mp->QI_PQIP);
VN_RELE(vp);
if (vp->v_count > 1)
cmn_err(CE_WARN, "PQUOTA busy vp=0x%x count=%d\n",
vp, vp->v_count);
}
return (0);
}
/*
vfs_sync: SYNC_FSDATA|SYNC_ATTR|SYNC_BDFLUSH|SYNC_NOWAIT 0x31
syscall sync: SYNC_FSDATA|SYNC_ATTR|SYNC_DELWRI 0x25
umountroot : SYNC_WAIT | SYNC_CLOSE | SYNC_ATTR | SYNC_FSDATA
*/
#if 0
/*
* VFS_SYNC flags: left here for reference.
*/
#define SYNC_NOWAIT 0 /* start delayed writes */
#define SYNC_ATTR 0x01 /* sync attributes */
#define SYNC_CLOSE 0x02 /* close file system down */
#define SYNC_DELWRI 0x04 /* look at delayed writes */
#define SYNC_WAIT 0x08 /* wait for i/o to complete */
#define SYNC_BDFLUSH 0x10 /* BDFLUSH is calling -- don't block */
#define SYNC_FSDATA 0x20 /* flush fs data (e.g. superblocks) */
#define SYNC_PDFLUSH 0x40 /* push v_dpages */
#endif
void
xfs_qm_sync(
xfs_mount_t *mp,
short flags)
{
int recl, restarts;
xfs_dquot_t *dqp;
uint flush_flags;
boolean_t nowait;
restarts = 0;
/*
* We won't block unless we are asked to.
*/
nowait = (boolean_t)(flags & SYNC_BDFLUSH || (flags & SYNC_WAIT) == 0);
again:
xfs_qm_mplist_lock(mp);
/*
* dqpurge_all takes the mplist and iterate thru all dquots in
* quotaoff also. However, if the QUOTA_ACTIVE bits are not cleared
* when we have the mplist lock, we know that dquots will be consistent
* as long as we have it locked.
*/
if (! XFS_IS_QUOTA_ON(mp)) {
xfs_qm_mplist_unlock(mp);
return;
}
FOREACH_DQUOT_IN_MP(dqp, mp) {
/*
* If this is vfs_sync calling, then skip the dquots that
* don't 'seem' to be dirty. ie. don't acquire dqlock.
* This is very similar to what xfs_sync does with inodes.
*/
if (flags & SYNC_BDFLUSH) {
if (! XFS_DQ_IS_DIRTY(dqp))
continue;
}
if (nowait) {
/*
* Try to acquire the dquot lock. We are NOT out of
* lock order, but we just don't want to wait for this
* lock, unless somebody wanted us to.
*/
if (! xfs_qm_dqlock_nowait(dqp))
continue;
} else {
xfs_dqlock(dqp);
}
/*
* Now, find out for sure if this dquot is dirty or not.
*/
if (! XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/* XXX a sentinel would be better */
recl = mp->QI_MPLRECLAIMS;
if (! xfs_qm_dqflock_nowait(dqp)) {
if (nowait) {
xfs_dqunlock(dqp);
continue;
}
/*
* If we can't grab the flush lock then if the caller
* really wanted us to give this our best shot,
* see if we can give a push to the buffer before we wait
* on the flush lock. At this point, we know that
* eventhough the dquot is being flushed,
* it has (new) dirty data.
*/
xfs_qm_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write
*/
flush_flags = (nowait) ? XFS_QMOPT_DELWRI : XFS_QMOPT_SYNC;
xfs_qm_mplist_unlock(mp);
xfs_dqtrace_entry(dqp, "XQM_SYNC: DQFLUSH");
xfs_qm_dqflush(dqp, flush_flags);
xfs_dqunlock(dqp);
xfs_qm_mplist_lock(mp);
if (recl != mp->QI_MPLRECLAIMS) {
if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
break;
xfs_qm_mplist_unlock(mp);
goto again;
}
}
xfs_qm_mplist_unlock(mp);
}
/*
* This initializes all the quota information that's kept in the
* mount structure
*/
int
xfs_qm_init_quotainfo(
xfs_mount_t *mp)
{
xfs_quotainfo_t *qinf;
int error;
xfs_dquot_t *dqp;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
ASSERT(G_xqm);
qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
/*
* See if quotainodes are setup, and if not, allocate them,
* and change the superblock accordingly.
*/
if (error = xfs_qm_init_quotainos(mp)) {
#ifdef QUOTADEBUG
printf("xfs_qm_init_quotainos failed ERROR %d\n", error);
#endif
kmem_free(qinf, sizeof(xfs_quotainfo_t));
mp->m_quotainfo = NULL;
return (error);
}
spinlock_init(&qinf->qi_pinlock, "xfs_qinf_pin");
xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
qinf->qi_dqreclaims = 0;
/* mutex used to serialize quotaoffs */
mutex_init(&qinf->qi_quotaofflock, MUTEX_DEFAULT, "qoff");
/* Precalc some constants */
qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
ASSERT(qinf->qi_dqchunklen);
qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen) /
sizeof(xfs_dqblk_t);
/*
* Tell XQM that we exist.
*/
xfs_qm_hold_quotafs_ref(mp);
mp->m_flags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
/*
* We try to get the limits from the superuser's limits fields.
* This is quite hacky, but it is standard practice.
* We look at the USR dquot with id == 0 first, but if user quotas
* are not enabled we goto the PROJ dquot with id == 0.
*/
error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)0,
(XFS_IS_UQUOTA_RUNNING(mp)) ?
XFS_DQ_USER : XFS_DQ_PROJ,
XFS_QMOPT_DQSUSER, &dqp);
if (! error) {
/*
* The warnings and timers set the grace period given to
* a user or project before he or she can not perform
* any more writing. If it is zero, a default is used.
*/
qinf->qi_btimelimit = dqp->q_core.d_btimer ?
dqp->q_core.d_btimer : XFS_QM_BTIMELIMIT;
qinf->qi_itimelimit = dqp->q_core.d_itimer ?
dqp->q_core.d_itimer : XFS_QM_ITIMELIMIT;
qinf->qi_rtbtimelimit = dqp->q_core.d_rtbtimer ?
dqp->q_core.d_rtbtimer : XFS_QM_RTBTIMELIMIT;
qinf->qi_bwarnlimit = dqp->q_core.d_bwarns ?
dqp->q_core.d_bwarns : XFS_QM_BWARNLIMIT;
qinf->qi_iwarnlimit = dqp->q_core.d_iwarns ?
dqp->q_core.d_iwarns : XFS_QM_IWARNLIMIT;
/*
* We sent the XFS_QMOPT_DQSUSER flag to dqget because
* we don't want this dquot cached. We haven't done a
* quotacheck yet, and quotacheck doesn't like incore dquots.
*/
xfs_qm_dqdestroy(dqp);
} else {
qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
}
return (0);
}
/*
* 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(
xfs_mount_t *mp)
{
xfs_quotainfo_t *qi;
qi = mp->m_quotainfo;
ASSERT(qi != NULL);
ASSERT(G_xqm != NULL);
/*
* Release the reference that XQM kept, so that we know
* when the XQM structure should be freed. We cannot assume
* that G_xqm is non-null after this point.
*/
xfs_qm_rele_quotafs_ref(mp);
spinlock_destroy(&qi->qi_pinlock);
if (qi->qi_uquotaip) {
XFS_PURGE_INODE(XFS_ITOV(qi->qi_uquotaip));
qi->qi_uquotaip = NULL; /* paranoia */
}
if (qi->qi_pquotaip) {
XFS_PURGE_INODE(XFS_ITOV(qi->qi_pquotaip));
qi->qi_pquotaip = NULL;
}
mutex_destroy(&qi->qi_quotaofflock);
kmem_free(qi, sizeof(xfs_quotainfo_t));
mp->m_quotainfo = NULL;
}
/* ------------------- PRIVATE STATIC FUNCTIONS ----------------------- */
/* ARGSUSED */
STATIC void
xfs_qm_list_init(
xfs_dqlist_t *list,
char *str,
int n)
{
mutex_init(&list->qh_lock, MUTEX_DEFAULT, str);
list->qh_next = NULL;
list->qh_version = 0;
list->qh_nelems = 0;
#ifdef QUOTADEBUG
list->qh_flags = 0;
#endif
}
STATIC void
xfs_qm_list_destroy(
xfs_dqlist_t *list)
{
mutex_destroy(&(list->qh_lock));
}
/*
* Stripped down version of dqattach. This doesn't attach, or even look at the
* dquots attached to the inode. The rationale is that there won't be any
* attached at the time this is called from quotacheck.
*/
STATIC int
xfs_qm_dqget_noattach(
xfs_inode_t *ip,
xfs_dquot_t **O_udqpp,
xfs_dquot_t **O_pdqpp)
{
int error;
xfs_mount_t *mp;
xfs_dquot_t *udqp, *pdqp;
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
mp = ip->i_mount;
udqp = NULL;
pdqp = NULL;
if (XFS_IS_UQUOTA_ON(mp)) {
if (error = xfs_qm_dqget(mp, ip, ip->i_d.di_uid,
XFS_DQ_USER,
XFS_QMOPT_DQALLOC, &udqp)) {
/*
* Shouldn't be able to turn off quotas here.
*/
ASSERT(error != ESRCH);
ASSERT(error != ENOENT);
xfs_qm_force_quotaoff(mp);
return XFS_ERROR(error);
}
ASSERT(udqp);
}
if (XFS_IS_PQUOTA_ON(mp)) {
if (udqp)
xfs_dqunlock(udqp);
if (error = xfs_qm_dqget(mp, ip, ip->i_d.di_projid,
XFS_DQ_PROJ,
XFS_QMOPT_DQALLOC, &pdqp)) {
if (udqp)
xfs_qm_dqrele(udqp);
ASSERT(error != ESRCH);
ASSERT(error != ENOENT);
xfs_qm_force_quotaoff(mp);
return XFS_ERROR(error);
}
ASSERT(pdqp);
/* Reacquire the locks in the right order */
if (udqp) {
if (! xfs_qm_dqlock_nowait(udqp)) {
xfs_dqunlock(pdqp);
xfs_dqlock(udqp);
xfs_dqlock(pdqp);
}
}
}
*O_udqpp = udqp;
*O_pdqpp = pdqp;
#ifdef QUOTADEBUG
if (udqp) ASSERT(XFS_DQ_IS_LOCKED(udqp));
if (pdqp) ASSERT(XFS_DQ_IS_LOCKED(pdqp));
#endif
return (0);
}
/*
* 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(
xfs_mount_t *mp,
xfs_inode_t **ip,
xfs_ino_t *O_msbinop,
__int64_t sbfields)
{
xfs_trans_t *tp;
int error;
cred_t zerocr;
int committed, s;
extern prid_t dfltprid;
tp = xfs_trans_alloc(mp,XFS_TRANS_QM_QINOCREATE);
if (error = xfs_trans_reserve(tp,
XFS_IALLOC_BLOCKS(mp) +
XFS_IN_MAXLEVELS(mp) +
XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) +
mp->m_sb.sb_sectsize + 128,
XFS_CREATE_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_CREATE_LOG_COUNT)) {
xfs_trans_cancel(tp, 0);
return (error);
}
bzero(&zerocr, sizeof(zerocr));
if (error = xfs_dir_ialloc(&tp, mp->m_rootip, IFREG, 1, mp->m_dev,
&zerocr, (xfs_prid_t) dfltprid, ip,
&committed)) {
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
return (error);
}
/*
* Keep an extra reference to this quota inode.
*/
VN_HOLD(XFS_ITOV((*ip)));
xfs_trans_log_inode(tp, *ip, XFS_ILOG_CORE);
/*
* Make the changes in the superblock, and log those too.
*/
s = XFS_SB_LOCK(mp);
*O_msbinop = (*ip)->i_ino;
XFS_SB_UNLOCK(mp, s);
xfs_mod_sb(tp, sbfields);
xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
#ifdef QUOTADEBUG
printf("quotaino %d\n", (int) (*ip)->i_ino);
#endif
return (0);
}
STATIC int
xfs_qm_reset_dqcounts(
xfs_mount_t *mp,
buf_t *bp)
{
xfs_disk_dquot_t *ddq;
int j;
/*
* Reset all counters and timers. They'll be
* started afresh by xfs_qm_quotacheck.
*/
ASSERT(XFS_QM_DQPERBLK(mp) ==
XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
sizeof(xfs_dqblk_t));
ddq = (xfs_disk_dquot_t *)bp->b_un.b_addr;
for (j = 0; j < XFS_QM_DQPERBLK(mp); j++) {
if (xfs_qm_dqcheck(ddq, -1, "xfs_qm_reset_dqcounts")) {
return XFS_ERROR(EIO);
}
/* printf("%d, ", ddq->d_id); */
ddq->d_bcount = 0ULL;
ddq->d_icount = 0ULL;
ddq->d_rtbcount = 0ULL;
ddq->d_btimer = (time_t)0;
ddq->d_itimer = (time_t)0;
ddq->d_bwarns = 0UL;
ddq->d_iwarns = 0UL;
ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
}
/* printf("\n"); */
return (0);
}
STATIC int
xfs_qm_dqiter_bufs(
xfs_mount_t *mp,
xfs_fsblock_t bno,
xfs_filblks_t blkcnt,
xfs_dqbuf_iter iterfunc,
uint flags)
{
buf_t *bp;
int error;
int notcommitted;
int incr;
xfs_trans_t *tp;
ASSERT(blkcnt > 0);
notcommitted = 0;
incr = (blkcnt > XFS_QM_MAX_DQCLUSTER_LOGSZ) ?
XFS_QM_MAX_DQCLUSTER_LOGSZ : blkcnt;
tp = NULL;
/*
* Blkcnt arg can be a very big number, and might even be
* larger than the log itself. So, we have to break it up into
* manageable-sized transactions.
* Note that we don't start a permanent transaction here; we might
* not be able to get a log reservation for the whole thing up front,
* and we don't really care to either, because we just discard
* everything if we were to crash in the middle of this loop.
*/
while (blkcnt--) {
bp = NULL;
if ((flags & XFS_QMOPT_DOLOG) &&
tp == NULL) {
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQCLUSTER);
/* Cannot fail here - no block reservation */
xfs_trans_reserve(tp, 0,
XFS_FSB_TO_B(mp, incr) + 128,
0, 0,
XFS_DEFAULT_LOG_COUNT);
}
error = xfs_trans_read_buf(tp, mp->m_dev,
XFS_FSB_TO_DADDR(mp, bno),
(int)mp->QI_DQCHUNKLEN,
0, &bp);
if (error || !bp)
break;
/*
* Send a buffer full of dquots to the supplied
* routine.
*/
if (iterfunc) {
error = (*iterfunc)(mp, bp);
if (error) {
xfs_trans_brelse(tp, bp);
break;
}
}
if (tp) {
/*
* Tag this as a cluster of dquots.
* (We don't have to distinguish between
* newly allocated and old dquot clusters
* as was done in inode clusters).
* Then log it.
*/
xfs_trans_dquot_buf(tp, bp,
flags & XFS_QMOPT_UQUOTA ?
XFS_BLI_UDQUOT_BUF :
XFS_BLI_PDQUOT_BUF);
xfs_trans_log_buf(tp, bp, 0,
BBTOB(mp->QI_DQCHUNKLEN) - 1);
if (++notcommitted == incr) {
notcommitted = 0;
xfs_trans_commit(tp, 0);
tp = NULL;
}
} else {
/*
* When we are doing the first phase of
* the quotacheck, we don't care about
* logging this buffer because if we
* crash, we'll have to do this again
* anyway. A delayed write is great
* for this because hopefully it'll
* accumulate all our (quotacheck) dquot
* updates and write them together.
*/
bdwrite(bp);
}
/*
* goto the next block.
*/
bno++;
}
if (tp) {
if (!error)
xfs_trans_commit(tp, 0);
else
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
}
#ifdef QUOTADEBUG
if (error)
printf("ERRROR %d\n", error);
#endif
return (0);
}
/*
* Iterate over all allocated USR/PRJ dquots in the system, calling a
* caller supplied function for every chunk of dquots that we find.
*/
STATIC int
xfs_qm_dqiterate(
xfs_mount_t *mp,
xfs_inode_t *qip,
uint flags,
xfs_dqbuf_iter iterfunc)
{
xfs_bmbt_irec_t map[XFS_DQITER_MAP_SIZE];
int i, nmap; /* number of map entries */
xfs_fsblock_t firstblock; /* start block for bmapi */
int error; /* return value */
__int64_t len, end, off, newoff, outlen;
xfs_dfiloff_t lblkno;
xfs_filblks_t lblkcnt, nblks;
error = 0;
/*
* This looks racey, but we can't keep an inode lock across a
* trans_reserve. But, this gets called during quotacheck, and that
* happens only at mount time which is single threaded. We take the
* ilock here because di_nblocks is a 64-bit number, but even that
* isn't necessary.
*/
xfs_ilock(qip, XFS_ILOCK_SHARED);
nblks = (xfs_filblks_t)qip->i_d.di_nblocks;
xfs_iunlock(qip, XFS_ILOCK_SHARED);
if (nblks == 0)
return (0);
lblkno = 0;
lblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAX_FILE_OFFSET);
len = XFS_FSB_TO_BB(mp, lblkcnt);
if (nblks > 500) {
cmn_err(CE_NOTE,
"XFS quotacheck: Iterating over quota entries in 0x%x BBs",
XFS_FSB_TO_BB(mp, nblks));
}
do {
firstblock = NULLFSBLOCK;
nmap = XFS_DQITER_MAP_SIZE;
/*
* We aren't changing the inode itself. Just changing
* some of its data. No new blocks are added here, and
* the inode is never added to the transaction.
*/
xfs_ilock(qip, XFS_IOLOCK_SHARED);
xfs_ilock(qip, XFS_ILOCK_SHARED);
error = xfs_bmapi(NULL, qip, (xfs_fileoff_t) lblkno,
lblkcnt,
XFS_BMAPI_ENTIRE|XFS_BMAPI_METADATA,
&firstblock,
0, map, &nmap, NULL);
xfs_iunlock(qip, XFS_ILOCK_SHARED);
xfs_iunlock(qip, XFS_IOLOCK_SHARED);
if (error)
break;
if (nmap == 0)
continue;
ASSERT(nmap <= XFS_DQITER_MAP_SIZE);
end = len;
/* printf("nmaps %d\n", nmap); */
for (error = i = 0; i < nmap && len; i++) {
ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
if (map[i].br_blockcount == 0)
continue;
lblkno += map[i].br_blockcount;
lblkcnt -= map[i].br_blockcount;
if (map[i].br_startblock == HOLESTARTBLOCK)
continue;
off = XFS_FSB_TO_BB(mp, map[i].br_startoff);
outlen = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
if (error = xfs_qm_dqiter_bufs(mp,
map[i].br_startblock,
map[i].br_blockcount,
iterfunc,
flags))
break;
newoff = off + outlen;
len = MAX(0, end - newoff);
nblks -= map[i].br_blockcount;
}
if (error)
break;
} while (len && nmap && nblks > 0);
return (error);
}
/*
* Called by dqusage_adjust in doing a quotacheck.
* Given the inode, and a dquot (either USR or PRJ, doesn't matter),
* this updates its incore copy 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 void
xfs_qm_quotacheck_dqadjust(
xfs_dquot_t *dqp,
xfs_qcnt_t nblks)
{
ASSERT(XFS_DQ_IS_LOCKED(dqp));
xfs_dqtrace_entry(dqp, "QCHECK DQADJUST");
/*
* Adjust the inode count and the block count to reflect this inode's
* resource usage.
*/
dqp->q_core.d_icount++;
dqp->q_core.d_bcount += nblks;
dqp->q_res_bcount += nblks;
/*
* Adjust the timers since we just changed usages
*/
if (! XFS_IS_SUSER_DQUOT(dqp))
xfs_qm_adjust_dqtimers(dqp->q_mount, &dqp->q_core);
dqp->dq_flags |= XFS_DQ_DIRTY;
}
/*
* 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(
xfs_mount_t *mp, /* mount point for filesystem */
xfs_trans_t *tp, /* transaction pointer */
xfs_ino_t ino, /* inode number to get data for */
void *buffer, /* not used */
daddr_t bno) /* starting block of inode cluster */
{
xfs_inode_t *ip;
xfs_dquot_t *udqp, *pdqp;
xfs_qcnt_t nblks;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* rootino must have its resources accounted for, not so with the quota
* inodes. How about the rt inodes ??? XXX
*/
if (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_pquotino)
return (0);
/*
* We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
* interface expects the inode to be exclusively locked because that's
* the case in all other instances. It's OK that we do this because
* quotacheck is done only at mount time.
*/
if (xfs_iget(mp, tp, ino, XFS_ILOCK_EXCL, &ip, bno))
return (0);
if (ip->i_d.di_mode == 0) {
xfs_iput(ip, XFS_ILOCK_EXCL);
return (0);
}
/*
* I don't deal with quotacheck for realtime files yet.
* Need to walk through realtime extents and actually count the
* blocks myself.
*/
ASSERT(! XFS_IS_REALTIME_INODE(ip));
/*
* Obtain the locked dquots.
*/
if (xfs_qm_dqget_noattach(ip, &udqp, &pdqp)) {
xfs_iput(ip, XFS_ILOCK_EXCL);
return (0);
}
/* XXX not so easy with RT inodes!
go thru all the extents and add up. nblocks contains
both rt and regular allocation for the rt inode */
nblks = (xfs_qcnt_t)ip->i_d.di_nblocks;
/*
* We can't release the inode while holding its dquot locks.
* The inode can go into inactive and might try to acquire the dquotlocks.
* So, just unlock here and do a vn_rele at the end.
*/
xfs_iunlock(ip, XFS_ILOCK_EXCL);
/*
* Add the (disk blocks and inode) resources occupied by this
* inode to its dquots. We do this adjustment in the incore dquot,
* and also copy the changes to its buffer.
* We don't care about putting these changes in a transaction
* envelope because if we crash in the middle of a 'quotacheck'
* we have to start from the beginning anyway.
* Once we're done, we'll log all the dquot bufs.
*
* The *QUOTA_ON checks below may look pretty racey, but quotachecks
* and quotaoffs don't race. (Quotachecks happen at mount time only).
*/
if (XFS_IS_UQUOTA_ON(mp)) {
ASSERT(udqp);
xfs_qm_quotacheck_dqadjust(udqp, nblks);
xfs_qm_dqput(udqp);
}
if (XFS_IS_PQUOTA_ON(mp)) {
ASSERT(pdqp);
xfs_qm_quotacheck_dqadjust(pdqp, nblks);
xfs_qm_dqput(pdqp);
}
/* printf("%d : %d\n", (int) ino, (int) nblks); */
/*
* Now release the inode. This will send it to 'inactive', and
* possibly even free blocks.
*/
VN_RELE(XFS_ITOV(ip));
/*
* No point in returning error values to bulkstat(), the caller.
* Zero will ensure that it doesn't advance thru the dummy buffer.
*/
return (1);
}
STATIC int
xfs_qm_quotacheck(
xfs_mount_t *mp)
{
int done, count, error;
ino64_t lastino;
size_t structsz;
xfs_inode_t *uip, *pip;
uint flags;
count = INT_MAX;
structsz = 1;
lastino = 0;
flags = 0;
ASSERT(mp->QI_UQIP || mp->QI_PQIP);
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* There should be no cached dquots. The (simplistic) quotacheck
* algorithm doesn't like that.
*/
ASSERT(mp->QI_MPLNDQUOTS == 0);
/*
* First we go thru all the dquots, USR and PRJ, and reset
* their counters to zero. We need a clean slate.
* We don't log our changes till later.
*/
if (uip = mp->QI_UQIP) {
if (error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
xfs_qm_reset_dqcounts))
return (error);
}
if (pip = mp->QI_PQIP) {
if (error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
xfs_qm_reset_dqcounts))
return (error);
}
do {
/*
* Iterate thru all the inodes in the file system,
* adjusting the corresponding dquot counters in core.
*/
if (error = xfs_bulkstat(mp, NULL, &lastino, &count,
xfs_qm_dqusage_adjust,
structsz, NULL, &done))
break;
} while (! done);
/*
* We've made all the changes that we need to make incore. Now flush_them
* down to disk buffers.
*/
xfs_qm_dqflush_all(mp, XFS_QMOPT_DELWRI);
/*
* We didn't log anything, because if we crashed, we'll have to
* start the quotacheck from scratch anyway. However, we must make
* sure that our dquot changes are secure before we put the
* quotacheck'd stamp on the superblock.
* So, here we iterate thru all the dquot clusters and log them.
* It isn't sufficient to just log the individual incore dquots because
* at the beginning we went ahead and zeroed all the counter values of all
* dquots right on the disk buffers, so we need to make sure that those
* somehow are permanent before we stamp the file system q'checked.
*/
if (uip) {
if (error = xfs_qm_dqiterate(mp, uip,
XFS_QMOPT_UQUOTA | XFS_QMOPT_DOLOG,
NULL))
return (error);
flags |= XFS_MOUNT_UDQ_CHKD;
}
if (pip) {
if (error = xfs_qm_dqiterate(mp, pip,
XFS_QMOPT_PQUOTA | XFS_QMOPT_DOLOG,
NULL))
return (error);
flags |= XFS_MOUNT_PDQ_CHKD;
}
/*
* If one type of quotas is off, then it will lose its
* quotachecked status, since we won't be doing accounting for
* that type anymore.
*/
mp->m_flags &= ~(XFS_MOUNT_PDQ_CHKD | XFS_MOUNT_UDQ_CHKD);
mp->m_flags |= flags;
#ifdef QUOTADEBUG
XQM_LIST_PRINT(&(mp->QI_MPL_LIST), MPL_NEXT, "++++ Mp list +++");
#endif
return (error);
}
/*
* 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)
{
xfs_inode_t *uip, *pip;
int error, s;
__int64_t sbflags;
ASSERT(mp->m_quotainfo);
uip = pip = NULL;
sbflags = 0;
/*
* get the uquota and pquota inodes
*/
if (XFS_SB_VERSION_HASQUOTA <= mp->m_sb.sb_versionnum) {
if (XFS_IS_UQUOTA_ON(mp) && mp->m_sb.sb_uquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_uquotino > 0);
if (error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
NULL, &uip, 0))
return XFS_ERROR(error);
}
if (XFS_IS_PQUOTA_ON(mp) && mp->m_sb.sb_pquotino != NULLFSINO) {
ASSERT(mp->m_sb.sb_pquotino > 0);
if (error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
NULL, &pip, 0)) {
if (uip)
VN_RELE(XFS_ITOV(uip));
return XFS_ERROR(error);
}
}
} else {
#ifdef DEBUG
cmn_err(CE_NOTE,
"Old superblock version %d.0, converting to %d.0\n",
(int) mp->m_sb.sb_versionnum,
(int) XFS_SB_VERSION);
#endif
s = XFS_SB_LOCK(mp);
mp->m_sb.sb_versionnum = XFS_SB_VERSION;
mp->m_sb.sb_uquotino = NULLFSINO;
mp->m_sb.sb_pquotino = NULLFSINO;
mp->m_sb.sb_qflags = 0;
XFS_SB_UNLOCK(mp, s);
sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
XFS_SB_PQUOTINO | XFS_SB_QFLAGS);
}
/*
* Create the two inodes, if they don't exist already. The changes
* made above will get added to a transaction and logged in one of
* the qino_alloc calls below.
*/
if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
if (error = xfs_qm_qino_alloc(mp, &uip, &mp->m_sb.sb_uquotino,
sbflags | XFS_SB_UQUOTINO))
return XFS_ERROR(error);
sbflags = 0;
}
if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
if (error = xfs_qm_qino_alloc(mp, &pip, &mp->m_sb.sb_pquotino,
sbflags | XFS_SB_PQUOTINO)) {
if (uip)
VN_RELE(XFS_ITOV(uip));
return XFS_ERROR(error);
}
sbflags = 0;
}
ASSERT(sbflags == 0);
mp->QI_UQIP = uip;
mp->QI_PQIP = pip;
return (0);
}
/*
* Traverse the freelist of dquots and attempt to reclaim a maximum of
* 'howmany' dquots. This operation races with dqlookup(), and attempts to
* favor the lookup function ...
* XXXsup merge this with qm_reclaim_one().
*/
STATIC int
xfs_qm_shake_freelist(
int howmany)
{
int nreclaimed;
xfs_dqhash_t *hash;
xfs_dquot_t *dqp, *nextdqp;
int restarts;
if (howmany <= 0)
return (0);
nreclaimed = 0;
restarts = 0;
/* lock order is : hashchainlock, freelistlock, mplistlock */
tryagain:
xfs_qm_freelist_lock(G_xqm);
for (dqp = G_xqm->QM_FLNEXT;
((dqp != (xfs_dquot_t *) &G_xqm->qm_dqfreelist) &&
nreclaimed < howmany); ) {
xfs_dqlock(dqp);
/*
* We are racing with dqlookup here. Naturally we don't
* want to reclaim a dquot that lookup wants.
*/
if (dqp->dq_flags & XFS_DQ_WANT) {
xfs_dqunlock(dqp);
xfs_qm_freelist_unlock(G_xqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return (nreclaimed != howmany);
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqwants++;
#endif
goto tryagain;
}
/*
* If the dquot is inactive, we are assured that it is
* not on the mplist or the hashlist, and that makes our
* life easier.
*/
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
#ifdef QUOTADEBUG
printf("INACTIVE DQUOT! -> shaken\n");
#endif
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(dqp->MPL_PREVP == NULL);
ASSERT(dqp->dq_flags == 0);
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqinact_reclaims++;
#endif
goto off_freelist;
}
ASSERT(hash);
ASSERT(dqp->MPL_PREVP);
/*
* Try to grab the flush lock. If this dquot is in the process of
* getting flushed to disk, we don't want to reclaim it.
*/
if (! xfs_qm_dqflock_nowait(dqp)) {
xfs_dqunlock(dqp);
dqp = dqp->dq_flnext;
continue;
}
/*
* We have the flush lock so we know that this is not in the
* process of being flushed. So, if this is dirty, flush it
* DELWRI so that we don't get a freelist infested with
* dirty dquots.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqtrace_entry(dqp, "DQSHAKE: DQDIRTY");
/*
* We flush it delayed write, so don't bother
* releasing the mplock.
*/
(void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
dqp = dqp->dq_flnext;
continue;
}
/*
* We're trying to get the hashlock out of order. This races
* with dqlookup; so, we giveup and goto the next dquot if
* we couldn't get the hashlock. This way, we won't starve
* a dqlookup process that holds the hashlock that is
* waiting for the freelist lock.
*/
if (! xfs_qm_dqhashlock_nowait(dqp)) {
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
dqp = dqp->dq_flnext;
continue;
}
/*
* This races with dquot allocation code as well as dqflush_all
* and reclaim code. So, if we failed to grab the mplist lock,
* giveup everything and start over.
*/
hash = dqp->q_hash;
if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
/* XXX put a sentinel so that we can come back here */
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(hash);
xfs_qm_freelist_unlock(G_xqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return (nreclaimed != howmany);
goto tryagain;
}
xfs_dqtrace_entry(dqp, "DQSHAKE: UNLINKING");
ASSERT(dqp->q_nrefs == 0);
nextdqp = dqp->dq_flnext;
XQM_MPLIST_REMOVE(&(dqp->q_mount->QI_MPL_LIST), dqp);
XQM_HASHLIST_REMOVE(hash, dqp);
xfs_dqfunlock(dqp);
xfs_qm_mplist_unlock(dqp->q_mount);
XFS_DQ_HASH_UNLOCK(hash);
off_freelist:
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
nreclaimed++;
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqshake_reclaims++;
#endif
xfs_qm_dqdestroy(dqp);
dqp = nextdqp;
#ifdef QUOTADEBUG
printf("--------------- shake_free (%d : 0x%x) --------------\n",
dqp->q_core.d_id, dqp->q_mount);
#endif
}
xfs_qm_freelist_unlock(G_xqm);
return (nreclaimed != howmany);
}
/*
* The shake manager routine called by shaked() when memory is
* running low. The heuristics here are copied from vn_shake().
* We are a lot more aggressive than vn_shake though.
*/
/* ARGSUSED */
STATIC int
xfs_qm_shake(int level)
{
int ndqused, nfree, n;
if (G_xqm == NULL)
return (0);
nfree = G_xqm->qm_dqfreelist.qh_nelems; /* free dquots */
ndqused = G_xqm->qm_totaldquots - nfree;/* incore dquots in all f/s's */
ASSERT(ndqused >= 0);
if (nfree <= ndqused && nfree < XFS_QM_NDQUOT_HIWAT)
return 0;
ndqused *= G_xqm->qm_dqfree_ratio; /* target # of free dquots */
n = nfree - ndqused - XFS_QM_NDQUOT_HIWAT; /* # over target */
return xfs_qm_shake_freelist(MAX(nfree, n));
}
/*
* Just pop the least recently used dquot off the freelist and
* recycle it. The returned dquot is locked.
*/
STATIC xfs_dquot_t *
xfs_qm_dqreclaim_one(void)
{
xfs_dquot_t *dqpout;
xfs_dquot_t *dqp;
int restarts;
restarts = 0;
dqpout = NULL;
/* lockorder: hashchainlock, freelistlock, mplistlock, dqlock, dqflock */
startagain:
xfs_qm_freelist_lock(G_xqm);
FOREACH_DQUOT_IN_FREELIST(dqp, &(G_xqm->qm_dqfreelist)) {
xfs_dqlock(dqp);
/*
* We are racing with dqlookup here. Naturally we don't
* want to reclaim a dquot that lookup wants. We release the
* freelist lock and start over, so that lookup will grab
* both the dquot and the freelistlock.
*/
if (dqp->dq_flags & XFS_DQ_WANT) {
ASSERT(! (dqp->dq_flags & XFS_DQ_INACTIVE));
xfs_dqtrace_entry(dqp, "DQRECLAIM: DQWANT");
xfs_dqunlock(dqp);
xfs_qm_freelist_unlock(G_xqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return (NULL);
#ifdef QUOTADEBUG
printf("XFS_QM_DQWANT !!\n");
#endif
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqwants++;
#endif
goto startagain;
}
/*
* If the dquot is inactive, we are assured that it is
* not on the mplist or the hashlist, and that makes our
* life easier.
*/
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
#ifdef QUOTADEBUG
printf("INACTIVE DQUOT! (reclaimed)\n");
#endif
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(dqp->MPL_PREVP == NULL);
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
dqpout = dqp;
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqinact_reclaims++;
#endif
break;
}
ASSERT(dqp->q_hash);
ASSERT(dqp->MPL_PREVP);
/*
* Try to grab the flush lock. If this dquot is in the process of
* getting flushed to disk, we don't want to reclaim it.
*/
if (! xfs_qm_dqflock_nowait(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/*
* We have the flush lock so we know that this is not in the
* process of being flushed. So, if this is dirty, flush it
* DELWRI so that we don't get a freelist infested with
* dirty dquots.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqtrace_entry(dqp, "DQRECLAIM: DQDIRTY");
/*
* We flush it delayed write, so don't bother
* releasing the mplock.
*/
(void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
continue;
}
if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
continue;
}
if (! xfs_qm_dqhashlock_nowait(dqp))
goto mplistunlock;
ASSERT(dqp->q_nrefs == 0);
xfs_dqtrace_entry(dqp, "DQRECLAIM: UNLINKING");
XQM_MPLIST_REMOVE(&(dqp->q_mount->QI_MPL_LIST), dqp);
XQM_HASHLIST_REMOVE(dqp->q_hash, dqp);
XQM_FREELIST_REMOVE(dqp);
dqpout = dqp;
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
mplistunlock:
xfs_qm_mplist_unlock(dqp->q_mount);
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
if (dqpout)
break;
}
#if 0
if (dqpout)
printf("---------------- reclaim_one (%d : 0x%x) --------------\n",
dqpout->q_core.d_id, dqpout);
#endif
xfs_qm_freelist_unlock(G_xqm);
return (dqpout);
}
/*
* In case of errors like disk failures, we disable quotas without
* the user asking us to do so, and try to continue. The attempt is to
* not halt the entire system because of quota problems.
*/
/* ARGSUSED */
void
xfs_qm_force_quotaoff(
xfs_mount_t *mp)
{
cmn_err(CE_WARN,
"quotas error: must disable quotas\n");
debug("quotaerr");
}
/*------------------------------------------------------------------*/
/*
* Return a new incore dquot. Depending on the number of
* dquots in the system, we either allocate a new one on the kernel heap,
* or reclaim a free one.
* Return value is B_TRUE if we allocated a new dquot, B_FALSE if we managed
* to reclaim an existing one from the freelist.
*/
boolean_t
xfs_qm_dqalloc_incore(
xfs_dquot_t **O_dqpp)
{
xfs_dquot_t *dqp;
/*
* Check against high water mark to see if we want to pop
* a nincompoop dquot off the freelist.
*/
if (G_xqm->qm_totaldquots >= XFS_QM_NDQUOT_HIWAT) {
/*
* Try to recycle a dquot from the freelist.
*/
if (dqp = xfs_qm_dqreclaim_one()) {
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqreclaims++;
#endif
/*
* Just bzero the core here. The rest will get
* reinitialized by caller. XXX we shouldn't even
* do this bzero ...
*/
bzero(&dqp->q_core, sizeof(dqp->q_core));
*O_dqpp = dqp;
return (B_FALSE);
}
#ifndef _BANYAN_XFS
XFSSTATS.xs_qm_dqreclaim_misses++;
#endif
}
/*
* Allocate a brand new dquot on the kernel heap and return it
* to the caller to initialize.
*/
ASSERT(G_xqm->qm_dqzone != NULL);
*O_dqpp = kmem_zone_zalloc(G_xqm->qm_dqzone, KM_SLEEP);
atomicAddUint(&G_xqm->qm_totaldquots, 1);
return (B_TRUE);
}
/*
* Start a transaction and write the incore superblock changes to
* disk. flags parameter indicates which fields have changed.
*/
int
xfs_qm_write_sb_changes(
xfs_mount_t *mp,
__int64_t flags)
{
xfs_trans_t *tp;
int error;
#ifdef QUOTADEBUG
printf("Writing superblock quota changes\n");
#endif
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
if (error = xfs_trans_reserve(tp, 0,
mp->m_sb.sb_sectsize + 128, 0,
0,
XFS_DEFAULT_LOG_COUNT))
goto error0;
xfs_mod_sb(tp, flags);
error = xfs_trans_commit(tp, 0);
error0:
if (error)
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
return (error);
}
/* --------------- utility functions for vnodeops ---------------- */
/*
* Given an inode, a uid and prid (from cred_t) 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 prid.
*
* in : inode (unlocked)
* out : udquot, pdquot with references taken and unlocked
*/
int
xfs_qm_vop_dqalloc(
xfs_mount_t *mp,
xfs_inode_t *ip,
uid_t uid,
xfs_prid_t prid,
uint flags,
xfs_dquot_t **O_udqpp,
xfs_dquot_t **O_pdqpp)
{
int error;
xfs_dquot_t *uq, *pq;
xfs_ilock(ip, XFS_ILOCK_EXCL);
/*
* Attach the dquot(s) to this inode, doing a dquot allocation
* if necessary. The dquot(s) will not be locked.
*/
if (XFS_NOT_DQATTACHED(mp, ip)) {
if (error = xfs_qm_dqattach(ip, XFS_QMOPT_DQALLOC |
XFS_QMOPT_ILOCKED)) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return (error);
}
}
uq = pq = NULL;
if ((flags & XFS_QMOPT_UQUOTA) &&
XFS_IS_UQUOTA_ON(mp)) {
if (ip->i_d.di_uid != uid) {
if (error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
XFS_DQ_USER,
XFS_QMOPT_DQALLOC,
&uq)) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
ASSERT(error != ENOENT);
if (error != ESRCH)
xfs_qm_force_quotaoff(mp);
return (error);
}
} else {
/*
* Take an extra reference, because we'll return
* this to caller
*/
ASSERT(ip->i_udquot);
uq = ip->i_udquot;
xfs_dqlock(uq);
XFS_DQHOLD(uq);
}
if (flags & XFS_QMOPT_INOQCHK) {
if (xfs_qm_check_inoquota(uq)) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_qm_dqput(uq);
return (EDQUOT);
}
}
xfs_dqunlock(uq);
}
if ((flags & XFS_QMOPT_PQUOTA) &&
XFS_IS_PQUOTA_ON(mp)) {
if (ip->i_d.di_projid != prid) {
if (error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
XFS_DQ_PROJ,
XFS_QMOPT_DQALLOC,
&pq)) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
if (uq)
xfs_qm_dqrele(uq);
ASSERT(error != ENOENT);
if (error != ESRCH)
xfs_qm_force_quotaoff(mp);
return (error);
}
} else {
ASSERT(ip->i_pdquot);
pq = ip->i_pdquot;
xfs_dqlock(pq);
XFS_DQHOLD(pq);
}
if (flags & XFS_QMOPT_INOQCHK) {
if (xfs_qm_check_inoquota(pq)) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_qm_dqput(pq);
if (uq)
xfs_qm_dqrele(uq);
return (EDQUOT);
}
}
xfs_dqunlock(pq);
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
if (O_udqpp)
*O_udqpp = uq;
if (O_pdqpp)
*O_pdqpp = pq;
return (0);
}
/*
* Actually transfer ownership, and do dquot modifications.
* These were already reserved.
*/
xfs_dquot_t *
xfs_qm_vop_chown(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t **IO_olddq,
xfs_dquot_t *newdq)
{
xfs_dquot_t *prevdq;
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
/* old dquot */
prevdq = *IO_olddq;
ASSERT(prevdq);
ASSERT(prevdq != newdq);
#if 0
printf("chown: %d blks [%d => %d]\n",
(int) ip->i_d.di_nblocks,
xfs_qm_dqid(prevdq),
xfs_qm_dqid(newdq));
#endif
xfs_trans_mod_dquot(tp, prevdq,
XFS_TRANS_DQ_BCOUNT,
-(ip->i_d.di_nblocks));
xfs_trans_mod_dquot(tp, prevdq,
XFS_TRANS_DQ_ICOUNT,
-1);
/* the sparkling new dquot */
xfs_trans_mod_dquot(tp, newdq,
XFS_TRANS_DQ_BCOUNT,
ip->i_d.di_nblocks);
xfs_trans_mod_dquot(tp, newdq,
XFS_TRANS_DQ_ICOUNT,
1);
/*
* Take an extra reference, because the inode
* is going to keep this dquot pointer even
* after the trans_commit.
*/
xfs_dqlock(newdq);
XFS_DQHOLD(newdq);
xfs_dqunlock(newdq);
*IO_olddq = newdq;
return (prevdq);
}
/*
* Quota reservations for setattr(AT_UID|AT_PROJID).
*/
int
xfs_qm_vop_chown_reserve(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t *udqp,
xfs_dquot_t *pdqp,
uint privileged)
{
int error;
xfs_mount_t *mp;
uint delblks;
xfs_dquot_t *unresudq, *unrespdq, *delblksudq, *delblkspdq;
ASSERT(XFS_ISLOCKED_INODE(ip));
mp = ip->i_mount;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
delblks = ip->i_delayed_blks;
delblksudq = delblkspdq = unresudq = unrespdq = NULL;
if (XFS_IS_UQUOTA_ON(mp) && udqp &&
ip->i_d.di_uid != (uid_t)udqp->q_core.d_id) {
delblksudq = udqp;
/*
* If there are delayed allocation blocks, then we have to
* unreserve those from the old dquot, and add them to the
* new dquot.
*/
if (delblks) {
ASSERT(ip->i_udquot);
unresudq = ip->i_udquot;
}
}
if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
ip->i_d.di_projid != (xfs_prid_t)pdqp->q_core.d_id) {
delblkspdq = pdqp;
if (delblks) {
ASSERT(ip->i_pdquot);
unrespdq = ip->i_pdquot;
}
}
if (! privileged) {
if (error = xfs_qm_check_inoquota2(mp, delblksudq,
delblkspdq))
return (error);
}
if (error = xfs_trans_reserve_blkquota_bydquots(tp, delblksudq,
delblkspdq,
ip->i_d.di_nblocks,
privileged))
return (error);
/*
* Do the delayed blks reservations/unreservations now. Since, these
* are done without the help of a transaction, if a reservation fails
* its previous reservations won't be automatically undone by trans
* code. So, we have to do it manually here.
*/
if (delblks) {
/*
* Do the reservations first. Unreservation can't fail.
*/
ASSERT(delblksudq || delblkspdq);
ASSERT(unresudq || unrespdq);
if (error = xfs_trans_reserve_blkquota_bydquots(NULL,
delblksudq,
delblkspdq,
(xfs_qcnt_t)delblks,
privileged))
return (error);
xfs_trans_unreserve_blkquota_bydquots(NULL,
unresudq,
unrespdq,
(xfs_qcnt_t)delblks, 0);
}
return (0);
}
int
xfs_qm_vop_rename_dqattach(
xfs_inode_t **i_tab)
{
xfs_inode_t *ip;
int i;
int error;
ip = i_tab[0];
if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
error = xfs_qm_dqattach(ip, 0);
if (error)
return (error);
}
for (i = 1; (i < 4 && i_tab[i]); i++) {
/*
* Watch out for duplicate entries in the table.
*/
if ((ip = i_tab[i]) != i_tab[i-1]) {
if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
error = xfs_qm_dqattach(ip, 0);
if (error)
return (error);
}
}
}
return (0);
}
void
xfs_qm_vop_dqattach_and_dqmod_newinode(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dquot_t *udqp,
xfs_dquot_t *pdqp)
{
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));
if (udqp) {
xfs_dqlock(udqp);
XFS_DQHOLD(udqp);
xfs_dqunlock(udqp);
ASSERT(ip->i_udquot == NULL);
ip->i_udquot = udqp;
ASSERT(ip->i_d.di_uid == udqp->q_core.d_id);
xfs_trans_mod_dquot(tp, udqp,
XFS_TRANS_DQ_ICOUNT,
1);
}
if (pdqp) {
xfs_dqlock(pdqp);
XFS_DQHOLD(pdqp);
xfs_dqunlock(pdqp);
ASSERT(ip->i_pdquot == NULL);
ip->i_pdquot = pdqp;
ASSERT(ip->i_d.di_projid == pdqp->q_core.d_id);
xfs_trans_mod_dquot(tp, pdqp,
XFS_TRANS_DQ_ICOUNT,
1);
}
}
/* ------------- list stuff -----------------*/
void
xfs_qm_freelist_init(xfs_frlist_t *ql)
{
ql->qh_next = ql->qh_prev = (xfs_dquot_t *) ql;
mutex_init(&ql->qh_lock, MUTEX_DEFAULT, "dqf");
ql->qh_version = 0;
ql->qh_nelems = 0;
#ifdef QUOTADEBUG
ql->qh_flags = 0;
#endif
}
void
xfs_qm_freelist_destroy(xfs_frlist_t *ql)
{
xfs_dquot_t *dqp, *nextdqp;
mutex_lock(&ql->qh_lock, PINOD);
for (dqp = ql->qh_next;
dqp != (xfs_dquot_t *)ql; ) {
xfs_dqlock(dqp);
nextdqp = dqp->dq_flnext;
#ifdef QUOTADEBUG
printf("FREELIST destroy 0x%x\n", dqp);
#endif
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
xfs_qm_dqdestroy(dqp);
dqp = nextdqp;
}
/*
* Don't bother about unlocking.
*/
mutex_destroy(&ql->qh_lock);
ASSERT(ql->qh_nelems == 0);
}
void
xfs_qm_freelist_insert(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
dq->dq_flnext = ql->qh_next;
dq->dq_flprev = (xfs_dquot_t *)ql;
ql->qh_next = dq;
dq->dq_flnext->dq_flprev = dq;
G_xqm->qm_dqfreelist.qh_nelems++;
G_xqm->qm_dqfreelist.qh_version++;
}
void
xfs_qm_freelist_unlink(xfs_dquot_t *dq)
{
xfs_dquot_t *next = dq->dq_flnext;
xfs_dquot_t *prev = dq->dq_flprev;
next->dq_flprev = prev;
prev->dq_flnext = next;
dq->dq_flnext = dq->dq_flprev = dq;
G_xqm->qm_dqfreelist.qh_nelems--;
G_xqm->qm_dqfreelist.qh_version++;
}
#ifdef QUOTADEBUG
void
xfs_qm_freelist_print(xfs_frlist_t *qlist, char *title)
{
xfs_dquot_t *dq;
int i = 0;
printf("%s (#%d)\n", title, (int) qlist->qh_nelems);
FOREACH_DQUOT_IN_FREELIST(dq, qlist) {
printf("\t%d.\t\"%d (%s:0x%x)\"\t bcnt = %d, icnt = %d "
"refs = %d\n",
++i, (int) dq->q_core.d_id,
DQFLAGTO_TYPESTR(dq), dq,
(int) dq->q_core.d_bcount,
(int) dq->q_core.d_icount,
(int) dq->q_nrefs);
}
return;
}
#endif
void
xfs_qm_freelist_append(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
xfs_qm_freelist_insert((xfs_frlist_t *)ql->qh_prev, dq);
}
int
xfs_qm_dqhashlock_nowait(
xfs_dquot_t *dqp)
{
int locked;
locked = mutex_trylock(&((dqp)->q_hash->qh_lock));
#ifdef QUOTADEBUG
if (locked)
(dqp)->q_hash->qh_flags |= XFS_DQ_LOCKED;
#endif
return (locked);
}
int
xfs_qm_freelist_lock_nowait(
xfs_qm_t *xqm)
{
int locked;
locked = mutex_trylock(&(xqm->qm_dqfreelist.qh_lock));
#ifdef QUOTADEBUG
if (locked)
xqm->qm_dqfreelist.qh_flags |= XFS_DQ_LOCKED;
#endif
return (locked);
}
int
xfs_qm_mplist_nowait(
xfs_mount_t *mp)
{
int locked;
ASSERT(mp->m_quotainfo);
locked = mutex_trylock(&(mp->QI_MPL_LIST.qh_lock));
#ifdef QUOTADEBUG
if (locked)
mp->QI_MPL_LIST.qh_flags |= XFS_DQ_LOCKED;
#endif
return (locked);
}
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