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path: root/fs/nfs/blocklayout/extents.c
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Diffstat (limited to 'fs/nfs/blocklayout/extents.c')
-rw-r--r--fs/nfs/blocklayout/extents.c176
1 files changed, 75 insertions, 101 deletions
diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
index 19fa7b0b8c00..1abac09f7cd5 100644
--- a/fs/nfs/blocklayout/extents.c
+++ b/fs/nfs/blocklayout/extents.c
@@ -110,13 +110,7 @@ static int _add_entry(struct my_tree *tree, u64 s, int32_t tag,
return 0;
} else {
struct pnfs_inval_tracking *new;
- if (storage)
- new = storage;
- else {
- new = kmalloc(sizeof(*new), GFP_NOFS);
- if (!new)
- return -ENOMEM;
- }
+ new = storage;
new->it_sector = s;
new->it_tags = (1 << tag);
list_add(&new->it_link, &pos->it_link);
@@ -139,11 +133,13 @@ static int _set_range(struct my_tree *tree, int32_t tag, u64 s, u64 length)
}
/* Ensure that future operations on given range of tree will not malloc */
-static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
+static int _preload_range(struct pnfs_inval_markings *marks,
+ u64 offset, u64 length)
{
u64 start, end, s;
int count, i, used = 0, status = -ENOMEM;
struct pnfs_inval_tracking **storage;
+ struct my_tree *tree = &marks->im_tree;
dprintk("%s(%llu, %llu) enter\n", __func__, offset, length);
start = normalize(offset, tree->mtt_step_size);
@@ -161,12 +157,11 @@ static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
goto out_cleanup;
}
- /* Now need lock - HOW??? */
-
+ spin_lock_bh(&marks->im_lock);
for (s = start; s < end; s += tree->mtt_step_size)
used += _add_entry(tree, s, INTERNAL_EXISTS, storage[used]);
+ spin_unlock_bh(&marks->im_lock);
- /* Unlock - HOW??? */
status = 0;
out_cleanup:
@@ -179,41 +174,14 @@ static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
return status;
}
-static void set_needs_init(sector_t *array, sector_t offset)
-{
- sector_t *p = array;
-
- dprintk("%s enter\n", __func__);
- if (!p)
- return;
- while (*p < offset)
- p++;
- if (*p == offset)
- return;
- else if (*p == ~0) {
- *p++ = offset;
- *p = ~0;
- return;
- } else {
- sector_t *save = p;
- dprintk("%s Adding %llu\n", __func__, (u64)offset);
- while (*p != ~0)
- p++;
- p++;
- memmove(save + 1, save, (char *)p - (char *)save);
- *save = offset;
- return;
- }
-}
-
/* We are relying on page lock to serialize this */
int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect)
{
int rv;
- spin_lock(&marks->im_lock);
+ spin_lock_bh(&marks->im_lock);
rv = _has_tag(&marks->im_tree, isect, EXTENT_INITIALIZED);
- spin_unlock(&marks->im_lock);
+ spin_unlock_bh(&marks->im_lock);
return rv;
}
@@ -253,78 +221,39 @@ static int is_range_written(struct pnfs_inval_markings *marks,
{
int rv;
- spin_lock(&marks->im_lock);
+ spin_lock_bh(&marks->im_lock);
rv = _range_has_tag(&marks->im_tree, start, end, EXTENT_WRITTEN);
- spin_unlock(&marks->im_lock);
+ spin_unlock_bh(&marks->im_lock);
return rv;
}
/* Marks sectors in [offest, offset_length) as having been initialized.
* All lengths are step-aligned, where step is min(pagesize, blocksize).
- * Notes where partial block is initialized, and helps prepare it for
- * complete initialization later.
+ * Currently assumes offset is page-aligned
*/
-/* Currently assumes offset is page-aligned */
int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
- sector_t offset, sector_t length,
- sector_t **pages)
+ sector_t offset, sector_t length)
{
- sector_t s, start, end;
- sector_t *array = NULL; /* Pages to mark */
+ sector_t start, end;
dprintk("%s(offset=%llu,len=%llu) enter\n",
__func__, (u64)offset, (u64)length);
- s = max((sector_t) 3,
- 2 * (marks->im_block_size / (PAGE_CACHE_SECTORS)));
- dprintk("%s set max=%llu\n", __func__, (u64)s);
- if (pages) {
- array = kmalloc(s * sizeof(sector_t), GFP_NOFS);
- if (!array)
- goto outerr;
- array[0] = ~0;
- }
start = normalize(offset, marks->im_block_size);
end = normalize_up(offset + length, marks->im_block_size);
- if (_preload_range(&marks->im_tree, start, end - start))
+ if (_preload_range(marks, start, end - start))
goto outerr;
- spin_lock(&marks->im_lock);
-
- for (s = normalize_up(start, PAGE_CACHE_SECTORS);
- s < offset; s += PAGE_CACHE_SECTORS) {
- dprintk("%s pre-area pages\n", __func__);
- /* Portion of used block is not initialized */
- if (!_has_tag(&marks->im_tree, s, EXTENT_INITIALIZED))
- set_needs_init(array, s);
- }
+ spin_lock_bh(&marks->im_lock);
if (_set_range(&marks->im_tree, EXTENT_INITIALIZED, offset, length))
goto out_unlock;
- for (s = normalize_up(offset + length, PAGE_CACHE_SECTORS);
- s < end; s += PAGE_CACHE_SECTORS) {
- dprintk("%s post-area pages\n", __func__);
- if (!_has_tag(&marks->im_tree, s, EXTENT_INITIALIZED))
- set_needs_init(array, s);
- }
-
- spin_unlock(&marks->im_lock);
+ spin_unlock_bh(&marks->im_lock);
- if (pages) {
- if (array[0] == ~0) {
- kfree(array);
- *pages = NULL;
- } else
- *pages = array;
- }
return 0;
- out_unlock:
- spin_unlock(&marks->im_lock);
- outerr:
- if (pages) {
- kfree(array);
- *pages = NULL;
- }
+out_unlock:
+ spin_unlock_bh(&marks->im_lock);
+outerr:
return -ENOMEM;
}
@@ -338,9 +267,9 @@ static int mark_written_sectors(struct pnfs_inval_markings *marks,
dprintk("%s(offset=%llu,len=%llu) enter\n", __func__,
(u64)offset, (u64)length);
- spin_lock(&marks->im_lock);
+ spin_lock_bh(&marks->im_lock);
status = _set_range(&marks->im_tree, EXTENT_WRITTEN, offset, length);
- spin_unlock(&marks->im_lock);
+ spin_unlock_bh(&marks->im_lock);
return status;
}
@@ -440,20 +369,18 @@ static void add_to_commitlist(struct pnfs_block_layout *bl,
/* Note the range described by offset, length is guaranteed to be contained
* within be.
+ * new will be freed, either by this function or add_to_commitlist if they
+ * decide not to use it, or after LAYOUTCOMMIT uses it in the commitlist.
*/
int bl_mark_for_commit(struct pnfs_block_extent *be,
- sector_t offset, sector_t length)
+ sector_t offset, sector_t length,
+ struct pnfs_block_short_extent *new)
{
sector_t new_end, end = offset + length;
- struct pnfs_block_short_extent *new;
struct pnfs_block_layout *bl = container_of(be->be_inval,
struct pnfs_block_layout,
bl_inval);
- new = kmalloc(sizeof(*new), GFP_NOFS);
- if (!new)
- return -ENOMEM;
-
mark_written_sectors(be->be_inval, offset, length);
/* We want to add the range to commit list, but it must be
* block-normalized, and verified that the normalized range has
@@ -483,9 +410,6 @@ int bl_mark_for_commit(struct pnfs_block_extent *be,
new->bse_mdev = be->be_mdev;
spin_lock(&bl->bl_ext_lock);
- /* new will be freed, either by add_to_commitlist if it decides not
- * to use it, or after LAYOUTCOMMIT uses it in the commitlist.
- */
add_to_commitlist(bl, new);
spin_unlock(&bl->bl_ext_lock);
return 0;
@@ -933,3 +857,53 @@ clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl,
}
}
}
+
+int bl_push_one_short_extent(struct pnfs_inval_markings *marks)
+{
+ struct pnfs_block_short_extent *new;
+
+ new = kmalloc(sizeof(*new), GFP_NOFS);
+ if (unlikely(!new))
+ return -ENOMEM;
+
+ spin_lock_bh(&marks->im_lock);
+ list_add(&new->bse_node, &marks->im_extents);
+ spin_unlock_bh(&marks->im_lock);
+
+ return 0;
+}
+
+struct pnfs_block_short_extent *
+bl_pop_one_short_extent(struct pnfs_inval_markings *marks)
+{
+ struct pnfs_block_short_extent *rv = NULL;
+
+ spin_lock_bh(&marks->im_lock);
+ if (!list_empty(&marks->im_extents)) {
+ rv = list_entry((&marks->im_extents)->next,
+ struct pnfs_block_short_extent, bse_node);
+ list_del_init(&rv->bse_node);
+ }
+ spin_unlock_bh(&marks->im_lock);
+
+ return rv;
+}
+
+void bl_free_short_extents(struct pnfs_inval_markings *marks, int num_to_free)
+{
+ struct pnfs_block_short_extent *se = NULL, *tmp;
+
+ if (num_to_free <= 0)
+ return;
+
+ spin_lock(&marks->im_lock);
+ list_for_each_entry_safe(se, tmp, &marks->im_extents, bse_node) {
+ list_del(&se->bse_node);
+ kfree(se);
+ if (--num_to_free == 0)
+ break;
+ }
+ spin_unlock(&marks->im_lock);
+
+ BUG_ON(num_to_free > 0);
+}