| Date | Mon, 23 Jan 2012 18:34:57 -0800 | From | Greg KH <> | Subject | [077/129] pnfsblock: acquire im_lock in _preload_range |
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3.2-stable review patch. If anyone has any objections, please let me know.
------------------ Content-Length: 1825 Lines: 58
From: Peng Tao <bergwolf@gmail.com>
commit 39e567ae36fe03c2b446e1b83ee3d39bea08f90b upstream.
When calling _add_entry, we should take the im_lock to protect agains other modifiers.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- fs/nfs/blocklayout/extents.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
--- a/fs/nfs/blocklayout/extents.c +++ b/fs/nfs/blocklayout/extents.c @@ -139,11 +139,13 @@ static int _set_range(struct my_tree *tr } /* 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 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_inv 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);
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