atomic_set(&bp->b_hold, 1);
init_completion(&bp->b_iowait);
INIT_LIST_HEAD(&bp->b_list);
- INIT_LIST_HEAD(&bp->b_hash_list);
- init_MUTEX_LOCKED(&bp->b_sema); /* held, no waiters */
+ RB_CLEAR_NODE(&bp->b_rbnode);
+ sema_init(&bp->b_sema, 0); /* held, no waiters */
XB_SET_OWNER(bp);
bp->b_target = target;
bp->b_file_offset = range_base;
{
trace_xfs_buf_free(bp, _RET_IP_);
- ASSERT(list_empty(&bp->b_hash_list));
-
if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) {
uint i;
{
xfs_off_t range_base;
size_t range_length;
- xfs_bufhash_t *hash;
- xfs_buf_t *bp, *n;
+ struct xfs_perag *pag;
+ struct rb_node **rbp;
+ struct rb_node *parent;
+ xfs_buf_t *bp;
range_base = (ioff << BBSHIFT);
range_length = (isize << BBSHIFT);
ASSERT(!(range_length < (1 << btp->bt_sshift)));
ASSERT(!(range_base & (xfs_off_t)btp->bt_smask));
- hash = &btp->bt_hash[hash_long((unsigned long)ioff, btp->bt_hashshift)];
-
- spin_lock(&hash->bh_lock);
-
- list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) {
- ASSERT(btp == bp->b_target);
- if (bp->b_file_offset == range_base &&
- bp->b_buffer_length == range_length) {
+ /* get tree root */
+ pag = xfs_perag_get(btp->bt_mount,
+ xfs_daddr_to_agno(btp->bt_mount, ioff));
+
+ /* walk tree */
+ spin_lock(&pag->pag_buf_lock);
+ rbp = &pag->pag_buf_tree.rb_node;
+ parent = NULL;
+ bp = NULL;
+ while (*rbp) {
+ parent = *rbp;
+ bp = rb_entry(parent, struct xfs_buf, b_rbnode);
+
+ if (range_base < bp->b_file_offset)
+ rbp = &(*rbp)->rb_left;
+ else if (range_base > bp->b_file_offset)
+ rbp = &(*rbp)->rb_right;
+ else {
+ /*
+ * found a block offset match. If the range doesn't
+ * match, the only way this is allowed is if the buffer
+ * in the cache is stale and the transaction that made
+ * it stale has not yet committed. i.e. we are
+ * reallocating a busy extent. Skip this buffer and
+ * continue searching to the right for an exact match.
+ */
+ if (bp->b_buffer_length != range_length) {
+ ASSERT(bp->b_flags & XBF_STALE);
+ rbp = &(*rbp)->rb_right;
+ continue;
+ }
atomic_inc(&bp->b_hold);
goto found;
}
if (new_bp) {
_xfs_buf_initialize(new_bp, btp, range_base,
range_length, flags);
- new_bp->b_hash = hash;
- list_add(&new_bp->b_hash_list, &hash->bh_list);
+ rb_link_node(&new_bp->b_rbnode, parent, rbp);
+ rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree);
+ /* the buffer keeps the perag reference until it is freed */
+ new_bp->b_pag = pag;
+ spin_unlock(&pag->pag_buf_lock);
} else {
XFS_STATS_INC(xb_miss_locked);
+ spin_unlock(&pag->pag_buf_lock);
+ xfs_perag_put(pag);
}
-
- spin_unlock(&hash->bh_lock);
return new_bp;
found:
- spin_unlock(&hash->bh_lock);
+ spin_unlock(&pag->pag_buf_lock);
+ xfs_perag_put(pag);
/* Attempt to get the semaphore without sleeping,
* if this does not work then we need to drop the
xfs_buf_readahead(
xfs_buftarg_t *target,
xfs_off_t ioff,
- size_t isize,
- xfs_buf_flags_t flags)
+ size_t isize)
{
struct backing_dev_info *bdi;
if (bdi_read_congested(bdi))
return;
- flags |= (XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD);
- xfs_buf_read(target, ioff, isize, flags);
+ xfs_buf_read(target, ioff, isize,
+ XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD|XBF_DONT_BLOCK);
}
/*
XFS_BUF_BUSY(bp);
xfsbdstrat(mp, bp);
- error = xfs_iowait(bp);
+ error = xfs_buf_iowait(bp);
if (error || bp->b_error) {
xfs_buf_relse(bp);
return NULL;
xfs_buf_rele(
xfs_buf_t *bp)
{
- xfs_bufhash_t *hash = bp->b_hash;
+ struct xfs_perag *pag = bp->b_pag;
trace_xfs_buf_rele(bp, _RET_IP_);
- if (unlikely(!hash)) {
+ if (!pag) {
ASSERT(!bp->b_relse);
+ ASSERT(RB_EMPTY_NODE(&bp->b_rbnode));
if (atomic_dec_and_test(&bp->b_hold))
xfs_buf_free(bp);
return;
}
+ ASSERT(!RB_EMPTY_NODE(&bp->b_rbnode));
ASSERT(atomic_read(&bp->b_hold) > 0);
- if (atomic_dec_and_lock(&bp->b_hold, &hash->bh_lock)) {
+ if (atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock)) {
if (bp->b_relse) {
atomic_inc(&bp->b_hold);
- spin_unlock(&hash->bh_lock);
- (*(bp->b_relse)) (bp);
+ spin_unlock(&pag->pag_buf_lock);
+ bp->b_relse(bp);
} else {
ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)));
- list_del_init(&bp->b_hash_list);
- spin_unlock(&hash->bh_lock);
+ rb_erase(&bp->b_rbnode, &pag->pag_buf_tree);
+ spin_unlock(&pag->pag_buf_lock);
+ xfs_perag_put(pag);
xfs_buf_free(bp);
}
}
xfs_buf_t *bp =
container_of(work, xfs_buf_t, b_iodone_work);
- /*
- * We can get an EOPNOTSUPP to ordered writes. Here we clear the
- * ordered flag and reissue them. Because we can't tell the higher
- * layers directly that they should not issue ordered I/O anymore, they
- * need to check if the _XFS_BARRIER_FAILED flag was set during I/O completion.
- */
- if ((bp->b_error == EOPNOTSUPP) &&
- (bp->b_flags & (XBF_ORDERED|XBF_ASYNC)) == (XBF_ORDERED|XBF_ASYNC)) {
- trace_xfs_buf_ordered_retry(bp, _RET_IP_);
- bp->b_flags &= ~XBF_ORDERED;
- bp->b_flags |= _XFS_BARRIER_FAILED;
- xfs_buf_iorequest(bp);
- } else if (bp->b_iodone)
+ if (bp->b_iodone)
(*(bp->b_iodone))(bp);
else if (bp->b_flags & XBF_ASYNC)
xfs_buf_relse(bp);
/*
* 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
+ * We attach the EIO error, muck with its flags, and call xfs_buf_ioend
* so that the proper iodone callbacks get called.
*/
STATIC int
XFS_BUF_ERROR(bp, EIO);
/*
- * We're calling biodone, so delete XBF_DONE flag.
+ * We're calling xfs_buf_ioend, so delete XBF_DONE flag.
*/
XFS_BUF_UNREAD(bp);
XFS_BUF_UNDELAYWRITE(bp);
XFS_BUF_UNDONE(bp);
XFS_BUF_STALE(bp);
- xfs_biodone(bp);
+ xfs_buf_ioend(bp, 0);
return EIO;
}
/*
* Same as xfs_bioerror, except that we are releasing the buffer
- * here ourselves, and avoiding the biodone call.
+ * here ourselves, and avoiding the xfs_buf_ioend call.
* This is meant for userdata errors; metadata bufs come with
* iodone functions attached, so that we can track down errors.
*/
if (bp->b_flags & XBF_ORDERED) {
ASSERT(!(bp->b_flags & XBF_READ));
- rw = WRITE_BARRIER;
+ rw = WRITE_FLUSH_FUA;
} else if (bp->b_flags & XBF_LOG_BUFFER) {
ASSERT(!(bp->b_flags & XBF_READ_AHEAD));
bp->b_flags &= ~_XBF_RUN_QUEUES;
*/
void
xfs_wait_buftarg(
- xfs_buftarg_t *btp)
+ struct xfs_buftarg *btp)
{
- xfs_bufhash_t *hash;
- uint i;
+ struct xfs_perag *pag;
+ uint i;
- for (i = 0; i < (1 << btp->bt_hashshift); i++) {
- hash = &btp->bt_hash[i];
- spin_lock(&hash->bh_lock);
- while (!list_empty(&hash->bh_list)) {
- spin_unlock(&hash->bh_lock);
+ for (i = 0; i < btp->bt_mount->m_sb.sb_agcount; i++) {
+ pag = xfs_perag_get(btp->bt_mount, i);
+ spin_lock(&pag->pag_buf_lock);
+ while (rb_first(&pag->pag_buf_tree)) {
+ spin_unlock(&pag->pag_buf_lock);
delay(100);
- spin_lock(&hash->bh_lock);
+ spin_lock(&pag->pag_buf_lock);
}
- spin_unlock(&hash->bh_lock);
+ spin_unlock(&pag->pag_buf_lock);
+ xfs_perag_put(pag);
}
}
-/*
- * Allocate buffer hash table for a given target.
- * For devices containing metadata (i.e. not the log/realtime devices)
- * we need to allocate a much larger hash table.
- */
-STATIC void
-xfs_alloc_bufhash(
- xfs_buftarg_t *btp,
- int external)
-{
- unsigned int i;
-
- if (external) {
- btp->bt_hash = NULL;
- return;
- }
- btp->bt_hashshift = 12; /* 4096 buckets */
- 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);
- }
-}
-
-STATIC void
-xfs_free_bufhash(
- xfs_buftarg_t *btp)
-{
- kmem_free_large(btp->bt_hash);
- btp->bt_hash = NULL;
-}
-
/*
* buftarg list for delwrite queue processing
*/
xfs_flush_buftarg(btp, 1);
if (mp->m_flags & XFS_MOUNT_BARRIER)
xfs_blkdev_issue_flush(btp);
- xfs_free_bufhash(btp);
iput(btp->bt_mapping->host);
/* Unregister the buftarg first so that we don't get a
goto error;
if (xfs_alloc_delwrite_queue(btp, fsname))
goto error;
- xfs_alloc_bufhash(btp, external);
return btp;
error:
bp = list_first_entry(&wait_list, struct xfs_buf, b_list);
list_del_init(&bp->b_list);
- xfs_iowait(bp);
+ xfs_buf_iowait(bp);
xfs_buf_relse(bp);
}
}
goto out;
xfslogd_workqueue = alloc_workqueue("xfslogd",
- WQ_RESCUER | WQ_HIGHPRI, 1);
+ WQ_MEM_RECLAIM | WQ_HIGHPRI, 1);
if (!xfslogd_workqueue)
goto out_free_buf_zone;
git.openpandora.org / pandora-kernel.git / blobdiff