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scoutfs: start truncate from first block

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Truncation updates extents that intersect with the input range.  It
starts with the first block in the range and iterates until it has
searched for all the extents that could cover the range.

Extents are stored in items at their final block location so that we can
use _next to find intersections.  Truncation was searching for the next
extent after the full extent that it was still searching for.  That
means it was starting the search at the last block in the extent, not
the first.  It would miss all the extents that didn't overlap with the
last block it was searching for.

This fixed by searching from a temporary single block extent at the
start of the search range.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2017-08-17 15:29:08 -07:00
committed by Zach Brown
parent d1ae486d83
commit 8135b18c76
1 changed files with 4 additions and 1 deletions
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kmod/src/data.c
+4 -1
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@@ -530,6 +530,7 @@ int scoutfs_data_truncate_items(struct super_block *sb, u64 ino, u64 iblock,
struct scoutfs_key_buf last;
struct scoutfs_key_buf key;
struct native_extent found;
struct native_extent first;
struct native_extent rng;
struct native_extent ext;
struct native_extent ofl;
@@ -554,7 +555,9 @@ int scoutfs_data_truncate_items(struct super_block *sb, u64 ino, u64 iblock,
while (rng.blocks) {
/* find the next extent that could include our first block */
init_extent_key(&key, key_bytes, &rng, ino,
first = rng;
first.blocks = 1;
init_extent_key(&key, key_bytes, &first, ino,
SCOUTFS_FILE_EXTENT_TYPE);
ret = scoutfs_item_next_same(sb, &key, &last, NULL, NULL);