#include <linux/migrate.h>
#include <linux/backing-dev.h>
#include <linux/freezer.h>
+#include <linux/list_sort.h>
#include "xfs_sb.h"
#include "xfs_inum.h"
}
int
-xfs_bawrite(
- void *mp,
+xfs_bwrite(
+ struct xfs_mount *mp,
struct xfs_buf *bp)
{
- trace_xfs_buf_bawrite(bp, _RET_IP_);
+ int iowait = (bp->b_flags & XBF_ASYNC) == 0;
+ int error = 0;
- ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL);
+ bp->b_strat = xfs_bdstrat_cb;
+ bp->b_mount = mp;
+ bp->b_flags |= XBF_WRITE;
+ if (!iowait)
+ bp->b_flags |= _XBF_RUN_QUEUES;
xfs_buf_delwri_dequeue(bp);
+ xfs_buf_iostrategy(bp);
- bp->b_flags &= ~(XBF_READ | XBF_DELWRI | XBF_READ_AHEAD);
- bp->b_flags |= (XBF_WRITE | XBF_ASYNC | _XBF_RUN_QUEUES);
+ if (iowait) {
+ error = xfs_buf_iowait(bp);
+ if (error)
+ xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
+ xfs_buf_relse(bp);
+ }
- bp->b_mount = mp;
- bp->b_strat = xfs_bdstrat_cb;
- return xfs_bdstrat_cb(bp);
+ return error;
}
void
xfs_buf_delwri_queue(bp, 1);
}
+/*
+ * Called when we want to stop a buffer from getting written or read.
+ * We attach the EIO error, muck with its flags, and call biodone
+ * so that the proper iodone callbacks get called.
+ */
+STATIC int
+xfs_bioerror(
+ xfs_buf_t *bp)
+{
+#ifdef XFSERRORDEBUG
+ ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone);
+#endif
+
+ /*
+ * No need to wait until the buffer is unpinned, we aren't flushing it.
+ */
+ XFS_BUF_ERROR(bp, EIO);
+
+ /*
+ * We're calling biodone, so delete XBF_DONE flag.
+ */
+ XFS_BUF_UNREAD(bp);
+ XFS_BUF_UNDELAYWRITE(bp);
+ XFS_BUF_UNDONE(bp);
+ XFS_BUF_STALE(bp);
+
+ XFS_BUF_CLR_BDSTRAT_FUNC(bp);
+ xfs_biodone(bp);
+
+ return EIO;
+}
+
+/*
+ * Same as xfs_bioerror, except that we are releasing the buffer
+ * here ourselves, and avoiding the biodone call.
+ * This is meant for userdata errors; metadata bufs come with
+ * iodone functions attached, so that we can track down errors.
+ */
+STATIC int
+xfs_bioerror_relse(
+ struct xfs_buf *bp)
+{
+ int64_t fl = XFS_BUF_BFLAGS(bp);
+ /*
+ * No need to wait until the buffer is unpinned.
+ * We aren't flushing it.
+ *
+ * chunkhold expects B_DONE to be set, whether
+ * we actually finish the I/O or not. We don't want to
+ * change that interface.
+ */
+ XFS_BUF_UNREAD(bp);
+ XFS_BUF_UNDELAYWRITE(bp);
+ XFS_BUF_DONE(bp);
+ XFS_BUF_STALE(bp);
+ XFS_BUF_CLR_IODONE_FUNC(bp);
+ XFS_BUF_CLR_BDSTRAT_FUNC(bp);
+ if (!(fl & XBF_ASYNC)) {
+ /*
+ * Mark b_error and B_ERROR _both_.
+ * Lot's of chunkcache code assumes that.
+ * There's no reason to mark error for
+ * ASYNC buffers.
+ */
+ XFS_BUF_ERROR(bp, EIO);
+ XFS_BUF_FINISH_IOWAIT(bp);
+ } else {
+ xfs_buf_relse(bp);
+ }
+
+ return EIO;
+}
+
+
+/*
+ * All xfs metadata buffers except log state machine buffers
+ * get this attached as their b_bdstrat callback function.
+ * This is so that we can catch a buffer
+ * after prematurely unpinning it to forcibly shutdown the filesystem.
+ */
+int
+xfs_bdstrat_cb(
+ struct xfs_buf *bp)
+{
+ if (XFS_FORCED_SHUTDOWN(bp->b_mount)) {
+ trace_xfs_bdstrat_shut(bp, _RET_IP_);
+ /*
+ * Metadata write that didn't get logged but
+ * written delayed anyway. These aren't associated
+ * with a transaction, and can be ignored.
+ */
+ if (!bp->b_iodone && !XFS_BUF_ISREAD(bp))
+ return xfs_bioerror_relse(bp);
+ else
+ return xfs_bioerror(bp);
+ }
+
+ xfs_buf_iorequest(bp);
+ return 0;
+}
+
+/*
+ * Wrapper around bdstrat so that we can stop data from going to disk in case
+ * we are shutting down the filesystem. Typically user data goes thru this
+ * path; one of the exceptions is the superblock.
+ */
+void
+xfsbdstrat(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp)
+{
+ if (XFS_FORCED_SHUTDOWN(mp)) {
+ trace_xfs_bdstrat_shut(bp, _RET_IP_);
+ xfs_bioerror_relse(bp);
+ return;
+ }
+
+ xfs_buf_iorequest(bp);
+}
+
STATIC void
_xfs_buf_ioend(
xfs_buf_t *bp,
xfs_buf_t *bp, /* buffer to process */
size_t boff, /* starting buffer offset */
size_t bsize, /* length to copy */
- caddr_t data, /* data address */
+ void *data, /* data address */
xfs_buf_rw_t mode) /* read/write/zero flag */
{
size_t bend, cpoff, csize;
btp->bt_hashshift = external ? 3 : 8; /* 8 or 256 buckets */
btp->bt_hashmask = (1 << btp->bt_hashshift) - 1;
- btp->bt_hash = kmem_zalloc((1 << btp->bt_hashshift) *
- sizeof(xfs_bufhash_t), KM_SLEEP | KM_LARGE);
+ btp->bt_hash = kmem_zalloc_large((1 << btp->bt_hashshift) *
+ sizeof(xfs_bufhash_t));
for (i = 0; i < (1 << btp->bt_hashshift); i++) {
spin_lock_init(&btp->bt_hash[i].bh_lock);
INIT_LIST_HEAD(&btp->bt_hash[i].bh_list);
xfs_free_bufhash(
xfs_buftarg_t *btp)
{
- kmem_free(btp->bt_hash);
+ kmem_free_large(btp->bt_hash);
btp->bt_hash = NULL;
}
list_del(&bp->b_list);
}
+ if (list_empty(dwq)) {
+ /* start xfsbufd as it is about to have something to do */
+ wake_up_process(bp->b_target->bt_task);
+ }
+
bp->b_flags |= _XBF_DELWRI_Q;
list_add_tail(&bp->b_list, dwq);
bp->b_queuetime = jiffies;
trace_xfs_buf_delwri_dequeue(bp, _RET_IP_);
}
+/*
+ * If a delwri buffer needs to be pushed before it has aged out, then promote
+ * it to the head of the delwri queue so that it will be flushed on the next
+ * xfsbufd run. We do this by resetting the queuetime of the buffer to be older
+ * than the age currently needed to flush the buffer. Hence the next time the
+ * xfsbufd sees it is guaranteed to be considered old enough to flush.
+ */
+void
+xfs_buf_delwri_promote(
+ struct xfs_buf *bp)
+{
+ struct xfs_buftarg *btp = bp->b_target;
+ long age = xfs_buf_age_centisecs * msecs_to_jiffies(10) + 1;
+
+ ASSERT(bp->b_flags & XBF_DELWRI);
+ ASSERT(bp->b_flags & _XBF_DELWRI_Q);
+
+ /*
+ * Check the buffer age before locking the delayed write queue as we
+ * don't need to promote buffers that are already past the flush age.
+ */
+ if (bp->b_queuetime < jiffies - age)
+ return;
+ bp->b_queuetime = jiffies - age;
+ spin_lock(&btp->bt_delwrite_lock);
+ list_move(&bp->b_list, &btp->bt_delwrite_queue);
+ spin_unlock(&btp->bt_delwrite_lock);
+}
+
STATIC void
xfs_buf_runall_queues(
struct workqueue_struct *queue)
list_for_each_entry(btp, &xfs_buftarg_list, bt_list) {
if (test_bit(XBT_FORCE_SLEEP, &btp->bt_flags))
continue;
+ if (list_empty(&btp->bt_delwrite_queue))
+ continue;
set_bit(XBT_FORCE_FLUSH, &btp->bt_flags);
wake_up_process(btp->bt_task);
}
}
+/*
+ * Compare function is more complex than it needs to be because
+ * the return value is only 32 bits and we are doing comparisons
+ * on 64 bit values
+ */
+static int
+xfs_buf_cmp(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ struct xfs_buf *ap = container_of(a, struct xfs_buf, b_list);
+ struct xfs_buf *bp = container_of(b, struct xfs_buf, b_list);
+ xfs_daddr_t diff;
+
+ diff = ap->b_bn - bp->b_bn;
+ if (diff < 0)
+ return -1;
+ if (diff > 0)
+ return 1;
+ return 0;
+}
+
+void
+xfs_buf_delwri_sort(
+ xfs_buftarg_t *target,
+ struct list_head *list)
+{
+ list_sort(NULL, list, xfs_buf_cmp);
+}
+
STATIC int
xfsbufd(
void *data)
{
- struct list_head tmp;
- xfs_buftarg_t *target = (xfs_buftarg_t *)data;
- int count;
- xfs_buf_t *bp;
+ xfs_buftarg_t *target = (xfs_buftarg_t *)data;
current->flags |= PF_MEMALLOC;
set_freezable();
do {
+ long age = xfs_buf_age_centisecs * msecs_to_jiffies(10);
+ long tout = xfs_buf_timer_centisecs * msecs_to_jiffies(10);
+ int count = 0;
+ struct list_head tmp;
+
if (unlikely(freezing(current))) {
set_bit(XBT_FORCE_SLEEP, &target->bt_flags);
refrigerator();
clear_bit(XBT_FORCE_SLEEP, &target->bt_flags);
}
- schedule_timeout_interruptible(
- xfs_buf_timer_centisecs * msecs_to_jiffies(10));
+ /* sleep for a long time if there is nothing to do. */
+ if (list_empty(&target->bt_delwrite_queue))
+ tout = MAX_SCHEDULE_TIMEOUT;
+ schedule_timeout_interruptible(tout);
- xfs_buf_delwri_split(target, &tmp,
- xfs_buf_age_centisecs * msecs_to_jiffies(10));
-
- count = 0;
+ xfs_buf_delwri_split(target, &tmp, age);
+ list_sort(NULL, &tmp, xfs_buf_cmp);
while (!list_empty(&tmp)) {
- bp = list_entry(tmp.next, xfs_buf_t, b_list);
- ASSERT(target == bp->b_target);
-
+ struct xfs_buf *bp;
+ bp = list_first_entry(&tmp, struct xfs_buf, b_list);
list_del_init(&bp->b_list);
xfs_buf_iostrategy(bp);
count++;
xfs_buftarg_t *target,
int wait)
{
- struct list_head tmp;
- xfs_buf_t *bp, *n;
+ xfs_buf_t *bp;
int pincount = 0;
+ LIST_HEAD(tmp_list);
+ LIST_HEAD(wait_list);
xfs_buf_runall_queues(xfsconvertd_workqueue);
xfs_buf_runall_queues(xfsdatad_workqueue);
xfs_buf_runall_queues(xfslogd_workqueue);
set_bit(XBT_FORCE_FLUSH, &target->bt_flags);
- pincount = xfs_buf_delwri_split(target, &tmp, 0);
+ pincount = xfs_buf_delwri_split(target, &tmp_list, 0);
/*
- * Dropped the delayed write list lock, now walk the temporary list
+ * Dropped the delayed write list lock, now walk the temporary list.
+ * All I/O is issued async and then if we need to wait for completion
+ * we do that after issuing all the IO.
*/
- list_for_each_entry_safe(bp, n, &tmp, b_list) {
+ list_sort(NULL, &tmp_list, xfs_buf_cmp);
+ while (!list_empty(&tmp_list)) {
+ bp = list_first_entry(&tmp_list, struct xfs_buf, b_list);
ASSERT(target == bp->b_target);
- if (wait)
+ list_del_init(&bp->b_list);
+ if (wait) {
bp->b_flags &= ~XBF_ASYNC;
- else
- list_del_init(&bp->b_list);
-
+ list_add(&bp->b_list, &wait_list);
+ }
xfs_buf_iostrategy(bp);
}
- if (wait)
+ if (wait) {
+ /* Expedite and wait for IO to complete. */
blk_run_address_space(target->bt_mapping);
+ while (!list_empty(&wait_list)) {
+ bp = list_first_entry(&wait_list, struct xfs_buf, b_list);
- /*
- * Remaining list items must be flushed before returning
- */
- while (!list_empty(&tmp)) {
- bp = list_entry(tmp.next, xfs_buf_t, b_list);
-
- list_del_init(&bp->b_list);
- xfs_iowait(bp);
- xfs_buf_relse(bp);
+ list_del_init(&bp->b_list);
+ xfs_iowait(bp);
+ xfs_buf_relse(bp);
+ }
}
return pincount;
projects / linux-beck.git / blobdiff