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[XFS] add infrastructure for waiting on I/O completion at inode reclaim 

time

SGI-PV: 934766
SGI-Modid: xfs-linux:xfs-kern:196854a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Christoph Hellwig 2005-09-02 16:58:38 +10:00 committed by Nathan Scott
parent 592cb26bda
commit 51c91ed52b
4 changed files with 32 additions and 58 deletions
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11
fs/xfs/linux-2.6/xfs_aops.c
View File

@ -139,7 +139,7 @@ linvfs_unwritten_convert(
XFS_BUF_SET_FSPRIVATE(bp, NULL);
XFS_BUF_CLR_IODONE_FUNC(bp);
XFS_BUF_UNDATAIO(bp);
iput(LINVFS_GET_IP(vp));
vn_iowake(vp);
pagebuf_iodone(bp, 0, 0);
}
@ -448,14 +448,7 @@ xfs_map_unwritten(
if (!pb)
return -EAGAIN;
/* Take a reference to the inode to prevent it from
* being reclaimed while we have outstanding unwritten
* extent IO on it.
*/
if ((igrab(inode)) != inode) {
pagebuf_free(pb);
return -EAGAIN;
}
atomic_inc(&LINVFS_GET_VP(inode)->v_iocount);
/* Set the count to 1 initially, this will stop an I/O
* completion callout which happens before we have started

28
fs/xfs/linux-2.6/xfs_vnode.c
View File

@ -42,17 +42,33 @@ DEFINE_SPINLOCK(vnumber_lock);
*/
#define NVSYNC 37
#define vptosync(v) (&vsync[((unsigned long)v) % NVSYNC])
sv_t vsync[NVSYNC];
STATIC wait_queue_head_t vsync[NVSYNC];
void
vn_init(void)
{
register sv_t *svp;
register int i;
int i;
for (svp = vsync, i = 0; i < NVSYNC; i++, svp++)
init_sv(svp, SV_DEFAULT, "vsy", i);
for (i = 0; i < NVSYNC; i++)
init_waitqueue_head(&vsync[i]);
}
void
vn_iowait(
struct vnode *vp)
{
wait_queue_head_t *wq = vptosync(vp);
wait_event(*wq, (atomic_read(&vp->v_iocount) == 0));
}
void
vn_iowake(
struct vnode *vp)
{
if (atomic_dec_and_test(&vp->v_iocount))
wake_up(vptosync(vp));
}
/*
@ -111,6 +127,8 @@ vn_initialize(
/* Initialize the first behavior and the behavior chain head. */
vn_bhv_head_init(VN_BHV_HEAD(vp), "vnode");
atomic_set(&vp->v_iocount, 0);
#ifdef XFS_VNODE_TRACE
vp->v_trace = ktrace_alloc(VNODE_TRACE_SIZE, KM_SLEEP);
#endif /* XFS_VNODE_TRACE */

4
fs/xfs/linux-2.6/xfs_vnode.h
View File

@ -80,6 +80,7 @@ typedef struct vnode {
vnumber_t v_number; /* in-core vnode number */
vn_bhv_head_t v_bh; /* behavior head */
spinlock_t v_lock; /* VN_LOCK/VN_UNLOCK */
atomic_t v_iocount; /* outstanding I/O count */
#ifdef XFS_VNODE_TRACE
struct ktrace *v_trace; /* trace header structure */
#endif
@ -506,6 +507,9 @@ extern int vn_revalidate(struct vnode *);
extern void vn_revalidate_core(struct vnode *, vattr_t *);
extern void vn_remove(struct vnode *);
extern void vn_iowait(struct vnode *vp);
extern void vn_iowake(struct vnode *vp);
static inline int vn_count(struct vnode *vp)
{
return atomic_read(&LINVFS_GET_IP(vp)->i_count);

47
fs/xfs/xfs_vnodeops.c
View File

@ -3846,51 +3846,10 @@ xfs_reclaim(
return 0;
}
if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
if (ip->i_d.di_size > 0) {
/*
* Flush and invalidate any data left around that is
* a part of this file.
*
* Get the inode's i/o lock so that buffers are pushed
* out while holding the proper lock. We can't hold
* the inode lock here since flushing out buffers may
* cause us to try to get the lock in xfs_strategy().
*
* We don't have to call remapf() here, because there
* cannot be any mapped file references to this vnode
* since it is being reclaimed.
*/
xfs_ilock(ip, XFS_IOLOCK_EXCL);
vn_iowait(vp);
/*
* If we hit an IO error, we need to make sure that the
* buffer and page caches of file data for
* the file are tossed away. We don't want to use
* VOP_FLUSHINVAL_PAGES here because we don't want dirty
* pages to stay attached to the vnode, but be
* marked P_BAD. pdflush/vnode_pagebad
* hates that.
*/
if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
VOP_FLUSHINVAL_PAGES(vp, 0, -1, FI_NONE);
} else {
VOP_TOSS_PAGES(vp, 0, -1, FI_NONE);
}
ASSERT(VN_CACHED(vp) == 0);
ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
ip->i_delayed_blks == 0);
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
} else if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
/*
* di_size field may not be quite accurate if we're
* shutting down.
*/
VOP_TOSS_PAGES(vp, 0, -1, FI_NONE);
ASSERT(VN_CACHED(vp) == 0);
}
}
ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
ASSERT(VN_CACHED(vp) == 0);
/* If we have nothing to flush with this inode then complete the
* teardown now, otherwise break the link between the xfs inode