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scoutfs: read items from next segment in level

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If the starting key for a segment read doesn't fall in a segment then we
have to include the next segment from that level in the read.  If we
don't then the read can think that there are no more items at that level
and assume that all the items in the upper level are all that exist.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2017-06-22 17:08:02 -07:00
parent f7701177d2
commit e7655f00ee
1 changed files with 4 additions and 2 deletions
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6
kmod/src/manifest.c
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@@ -423,7 +423,9 @@ int scoutfs_manifest_add_ment_ref(struct super_block *sb,
*
* We only need to search for the starting key in all the higher levels.
* They do not overlap so we can iterate through the key space in each
* segment starting with the key.
* segment starting with the key. In each level we need the first
* existing segment that intersects with the range, even if it doesn't
* contain the key. The key might fall between segments at that level.
*
* This is called by the server who is processing manifest search
* messages from mounts. The server locks down the manifest while it
@@ -481,7 +483,7 @@ scoutfs_manifest_find_range_entries(struct super_block *sb,
/* XXX should use level counts to skip searches */
ment = scoutfs_ring_lookup(&mani->ring, &skey);
ment = scoutfs_ring_lookup_next(&mani->ring, &skey);
if (ment) {
found[nr++] = ment;
*found_bytes += scoutfs_manifest_bytes(ment);