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scoutfs: allow null val in scoutfs_item_lookup

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Some callers may want to just test if an item is present and not
necessarily want to setup storage for copying the value in.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2018-03-09 16:18:40 -08:00
committed by Zach Brown
parent 9f51b63f8d
commit 77f29fa021
1 changed files with 5 additions and 2 deletions
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7
kmod/src/item.c
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@@ -764,7 +764,7 @@ static bool lock_coverage(struct scoutfs_lock *lock,
/*
* Find an item with the given key and copy its value into the caller's
* value vector. The amount of bytes copied is returned which can be 0
* or truncated if the caller's buffer isn't big enough.
* or truncated if the caller's buffer isn't big enough or if val is null.
*
* The end key limits how many keys after the search key can be read
* and inserted into the cache.
@@ -789,7 +789,10 @@ int scoutfs_item_lookup(struct super_block *sb, struct scoutfs_key_buf *key,
item = find_item(sb, &cac->items, key);
if (item) {
item_referenced(cac, item);
ret = scoutfs_kvec_memcpy(val, item->val);
if (val)
ret = scoutfs_kvec_memcpy(val, item->val);
else
ret = 0;
} else if (check_range(sb, &cac->ranges, key, NULL)) {
ret = -ENOENT;
} else {