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Move the syncer linkage from vnode to bufobj.

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This is not quite a perfect separation: the syncer still think it knows
that everything is a vnode.
This commit is contained in:
Poul-Henning Kamp 2004-10-27 08:05:02 +00:00
parent d83b7498a4
commit 20eba72f53
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=136992
4 changed files with 52 additions and 44 deletions
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76
sys/kern/vfs_subr.c
View file

@ -193,11 +193,11 @@ int prtactive;
*/
static int syncer_delayno;
static long syncer_mask;
LIST_HEAD(synclist, vnode);
LIST_HEAD(synclist, bufobj);
static struct synclist *syncer_workitem_pending;
/*
* The sync_mtx protects:
* vp->v_synclist
* bo->bo_synclist
* sync_vnode_count
* syncer_delayno
* syncer_state
@ -831,6 +831,7 @@ getnewvnode(tag, mp, vops, vpp)
VI_LOCK(vp);
vp->v_dd = vp;
bo = &vp->v_bufobj;
bo->bo_private = vp;
bo->bo_mtx = &vp->v_interlock;
vp->v_vnlock = &vp->v_lock;
lockinit(vp->v_vnlock, PVFS, tag, VLKTIMEOUT, LK_NOPAUSE);
@ -927,8 +928,8 @@ vinvalbuf(vp, flags, cred, td, slpflag, slptimeo)
ASSERT_VOP_LOCKED(vp, "vinvalbuf");
VI_LOCK(vp);
bo = &vp->v_bufobj;
BO_LOCK(bo);
if (flags & V_SAVE) {
error = bufobj_wwait(bo, slpflag, slptimeo);
if (error) {
@ -1397,39 +1398,39 @@ brelvp(struct buf *bp)
/*
* Delete from old vnode list, if on one.
*/
vp = bp->b_vp;
VI_LOCK(vp);
vp = bp->b_vp; /* XXX */
bo = bp->b_bufobj;
BO_LOCK(bo);
if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN))
buf_vlist_remove(bp);
if ((vp->v_iflag & VI_ONWORKLST) && bo->bo_dirty.bv_cnt == 0) {
vp->v_iflag &= ~VI_ONWORKLST;
if ((bo->bo_flag & BO_ONWORKLST) && bo->bo_dirty.bv_cnt == 0) {
bo->bo_flag &= ~BO_ONWORKLST;
mtx_lock(&sync_mtx);
LIST_REMOVE(vp, v_synclist);
LIST_REMOVE(bo, bo_synclist);
syncer_worklist_len--;
mtx_unlock(&sync_mtx);
}
vdropl(vp);
bp->b_vp = NULL;
bp->b_bufobj = NULL;
VI_UNLOCK(vp);
BO_UNLOCK(bo);
}
/*
* Add an item to the syncer work queue.
*/
static void
vn_syncer_add_to_worklist(struct vnode *vp, int delay)
vn_syncer_add_to_worklist(struct bufobj *bo, int delay)
{
int slot;
ASSERT_VI_LOCKED(vp, "vn_syncer_add_to_worklist");
ASSERT_BO_LOCKED(bo);
mtx_lock(&sync_mtx);
if (vp->v_iflag & VI_ONWORKLST)
LIST_REMOVE(vp, v_synclist);
if (bo->bo_flag & BO_ONWORKLST)
LIST_REMOVE(bo, bo_synclist);
else {
vp->v_iflag |= VI_ONWORKLST;
bo->bo_flag |= BO_ONWORKLST;
syncer_worklist_len++;
}
@ -1437,7 +1438,7 @@ vn_syncer_add_to_worklist(struct vnode *vp, int delay)
delay = syncer_maxdelay - 2;
slot = (syncer_delayno + delay) & syncer_mask;
LIST_INSERT_HEAD(&syncer_workitem_pending[slot], vp, v_synclist);
LIST_INSERT_HEAD(&syncer_workitem_pending[slot], bo, bo_synclist);
mtx_unlock(&sync_mtx);
}
@ -1474,6 +1475,7 @@ sched_sync(void)
struct synclist *next;
struct synclist *slp;
struct vnode *vp;
struct bufobj *bo;
struct mount *mp;
long starttime;
struct thread *td = FIRST_THREAD_IN_PROC(updateproc);
@ -1549,16 +1551,17 @@ sched_sync(void)
last_work_seen = syncer_delayno;
if (net_worklist_len > 0 && syncer_state == SYNCER_FINAL_DELAY)
syncer_state = SYNCER_SHUTTING_DOWN;
while ((vp = LIST_FIRST(slp)) != NULL) {
while ((bo = LIST_FIRST(slp)) != NULL) {
vp = bo->bo_private; /* XXX */
if (VOP_ISLOCKED(vp, NULL) != 0 ||
vn_start_write(vp, &mp, V_NOWAIT) != 0) {
LIST_REMOVE(vp, v_synclist);
LIST_INSERT_HEAD(next, vp, v_synclist);
LIST_REMOVE(bo, bo_synclist);
LIST_INSERT_HEAD(next, bo, bo_synclist);
continue;
}
if (VI_TRYLOCK(vp) == 0) {
LIST_REMOVE(vp, v_synclist);
LIST_INSERT_HEAD(next, vp, v_synclist);
LIST_REMOVE(bo, bo_synclist);
LIST_INSERT_HEAD(next, bo, bo_synclist);
vn_finished_write(mp);
continue;
}
@ -1575,14 +1578,14 @@ sched_sync(void)
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
VI_LOCK(vp);
if ((vp->v_iflag & VI_ONWORKLST) != 0) {
if ((bo->bo_flag & BO_ONWORKLST) != 0) {
/*
* Put us back on the worklist. The worklist
* routine will remove us from our current
* position and then add us back in at a later
* position.
*/
vn_syncer_add_to_worklist(vp, syncdelay);
vn_syncer_add_to_worklist(bo, syncdelay);
}
vdropl(vp);
VI_UNLOCK(vp);
@ -1759,7 +1762,7 @@ reassignbuf(struct buf *bp)
* of clean buffers.
*/
if (bp->b_flags & B_DELWRI) {
if ((vp->v_iflag & VI_ONWORKLST) == 0) {
if ((bo->bo_flag & BO_ONWORKLST) == 0) {
switch (vp->v_type) {
case VDIR:
delay = dirdelay;
@ -1770,18 +1773,18 @@ reassignbuf(struct buf *bp)
default:
delay = filedelay;
}
vn_syncer_add_to_worklist(vp, delay);
vn_syncer_add_to_worklist(bo, delay);
}
buf_vlist_add(bp, bo, BX_VNDIRTY);
} else {
buf_vlist_add(bp, bo, BX_VNCLEAN);
if ((vp->v_iflag & VI_ONWORKLST) && bo->bo_dirty.bv_cnt == 0) {
if ((bo->bo_flag & BO_ONWORKLST) && bo->bo_dirty.bv_cnt == 0) {
mtx_lock(&sync_mtx);
LIST_REMOVE(vp, v_synclist);
LIST_REMOVE(bo, bo_synclist);
syncer_worklist_len--;
mtx_unlock(&sync_mtx);
vp->v_iflag &= ~VI_ONWORKLST;
bo->bo_flag &= ~BO_ONWORKLST;
}
}
VI_UNLOCK(vp);
@ -3329,7 +3332,8 @@ vfs_allocate_syncvnode(mp)
next = start;
}
VI_LOCK(vp);
vn_syncer_add_to_worklist(vp, syncdelay > 0 ? next % syncdelay : 0);
vn_syncer_add_to_worklist(&vp->v_bufobj,
syncdelay > 0 ? next % syncdelay : 0);
/* XXX - vn_syncer_add_to_worklist() also grabs and drops sync_mtx. */
mtx_lock(&sync_mtx);
sync_vnode_count++;
@ -3355,6 +3359,7 @@ sync_fsync(ap)
struct mount *mp = syncvp->v_mount;
struct thread *td = ap->a_td;
int error, asyncflag;
struct bufobj *bo;
/*
* We only need to do something if this is a lazy evaluation.
@ -3365,9 +3370,10 @@ sync_fsync(ap)
/*
* Move ourselves to the back of the sync list.
*/
VI_LOCK(syncvp);
vn_syncer_add_to_worklist(syncvp, syncdelay);
VI_UNLOCK(syncvp);
bo = &syncvp->v_bufobj;
BO_LOCK(bo);
vn_syncer_add_to_worklist(bo, syncdelay);
BO_UNLOCK(bo);
/*
* Walk the list of vnodes pushing all that are dirty and
@ -3421,16 +3427,18 @@ sync_reclaim(ap)
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct bufobj *bo;
VI_LOCK(vp);
bo = &vp->v_bufobj;
vp->v_mount->mnt_syncer = NULL;
if (vp->v_iflag & VI_ONWORKLST) {
if (bo->bo_flag & BO_ONWORKLST) {
mtx_lock(&sync_mtx);
LIST_REMOVE(vp, v_synclist);
LIST_REMOVE(bo, bo_synclist);
syncer_worklist_len--;
sync_vnode_count--;
mtx_unlock(&sync_mtx);
vp->v_iflag &= ~VI_ONWORKLST;
bo->bo_flag &= ~BO_ONWORKLST;
}
VI_UNLOCK(vp);

5
sys/sys/buf.h
View file

@ -48,6 +48,7 @@ struct buf;
struct bufobj;
struct mount;
struct vnode;
struct uio;
/*
* To avoid including <ufs/ffs/softdep.h>
@ -398,6 +399,7 @@ struct cluster_save {
static __inline int
bwrite(struct buf *bp)
{
KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp));
KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp));
KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL,
@ -408,6 +410,7 @@ bwrite(struct buf *bp)
static __inline void
bstrategy(struct buf *bp)
{
KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp));
KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp));
KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL,
@ -481,8 +484,6 @@ extern int bufpages; /* Number of memory pages in the buffer pool. */
extern struct buf *swbuf; /* Swap I/O buffer headers. */
extern int nswbuf; /* Number of swap I/O buffer headers. */
struct uio;
caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est);
void bufinit(void);
void bwillwrite(void);

9
sys/sys/bufobj.h
View file

@ -85,8 +85,15 @@ struct bufobj {
struct buf_ops *bo_ops; /* - Buffer operations */
int bo_bsize; /* - Block size for i/o */
struct vm_object *bo_object; /* v Place to store VM object */
LIST_ENTRY(bufobj) bo_synclist; /* S dirty vnode list */
void *bo_private; /* private pointer */
};
/*
* XXX BO_ONWORKLST could be replaced with a check for NULL list elements
* in v_synclist.
*/
#define BO_ONWORKLST (1 << 0) /* On syncer work-list */
#define BO_WWAIT (1 << 1) /* Wait for output to complete */
#define BO_LOCK(bo) \
@ -111,5 +118,3 @@ int bufobj_wwait(struct bufobj *bo, int slpflag, int timeo);
#endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
#endif /* _SYS_BUFOBJ_H_ */

6
sys/sys/vnode.h
View file

@ -130,7 +130,6 @@ struct vnode {
} v_un;
TAILQ_ENTRY(vnode) v_freelist; /* f vnode freelist */
TAILQ_ENTRY(vnode) v_nmntvnodes; /* m vnodes for mount point */
LIST_ENTRY(vnode) v_synclist; /* S dirty vnode list */
enum vtype v_type; /* u vnode type */
const char *v_tag; /* u type of underlying data */
void *v_data; /* u private data for fs */
@ -224,11 +223,6 @@ struct xvnode {
#define VI_FREE 0x0100 /* This vnode is on the freelist */
#define VI_OBJDIRTY 0x0400 /* object might be dirty */
#define VI_DOINGINACT 0x0800 /* VOP_INACTIVE is in progress */
/*
* XXX VI_ONWORKLST could be replaced with a check for NULL list elements
* in v_synclist.
*/
#define VI_ONWORKLST 0x0200 /* On syncer work-list */
#define VV_ROOT 0x0001 /* root of its filesystem */
#define VV_ISTTY 0x0002 /* vnode represents a tty */