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pnfsblock: acquire im_lock in _preload_range

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When calling _add_entry, we should take the im_lock to protect
agains other modifiers.

Cc: <stable@vger.kernel.org> #3.1+
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Peng Tao 2012-01-12 23:18:41 +08:00 committed by Trond Myklebust
parent de040beccd
commit 39e567ae36
1 changed files with 6 additions and 5 deletions
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11
fs/nfs/blocklayout/extents.c
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@ -139,11 +139,13 @@ 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 +163,11 @@ static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
goto out_cleanup;
}
/* Now need lock - HOW??? */
spin_lock(&marks->im_lock);
for (s = start; s < end; s += tree->mtt_step_size)
used += _add_entry(tree, s, INTERNAL_EXISTS, storage[used]);
spin_unlock(&marks->im_lock);
/* Unlock - HOW??? */
status = 0;
out_cleanup:
@ -286,7 +287,7 @@ int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
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);