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scoutfs: add scoutfs_extent_prev()

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Add an extent function for iterating backwards through extents.  We add
the wrapper and have the extent IO functions call their storage _prev
functions.  Data extent IO can now call the new scoutfs_item_prev().

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2018-06-29 14:42:06 -07:00
committed by Zach Brown
parent d53ec115bc
commit 04660dbfee
6 changed files with 42 additions and 5 deletions
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kmod/src/data.c
+10 -2
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@@ -139,6 +139,7 @@ static int data_extent_io(struct super_block *sb, int op,
{
struct scoutfs_lock *lock = data;
struct scoutfs_file_extent fex;
struct scoutfs_key first;
struct scoutfs_key last;
struct scoutfs_key key;
struct kvec val;
@@ -164,6 +165,7 @@ static int data_extent_io(struct super_block *sb, int op,
if (ext->type == SCOUTFS_FILE_EXTENT_TYPE) {
init_file_extent_key(&key, ext->owner,
ext->start + ext->len - 1);
init_file_extent_key(&first, ext->owner, 0);
init_file_extent_key(&last, ext->owner, U64_MAX);
fex.blkno = cpu_to_le64(ext->map);
fex.len = cpu_to_le64(ext->len);
@@ -174,14 +176,20 @@ static int data_extent_io(struct super_block *sb, int op,
ext->start + ext->len - 1, ext->len);
if (ext->type == SCOUTFS_FREE_EXTENT_BLOCKS_TYPE)
swap(key.sknf_major, key.sknf_minor);
init_free_extent_key(&first, ext->type, ext->owner,
0, 0);
init_free_extent_key(&last, ext->type, ext->owner,
U64_MAX, U64_MAX);
kvec_init(&val, NULL, 0);
}
if (op == SEI_NEXT) {
if (op == SEI_NEXT || op == SEI_PREV) {
expected = val.iov_len;
ret = scoutfs_item_next(sb, &key, &last, &val, lock);
if (op == SEI_NEXT)
ret = scoutfs_item_next(sb, &key, &last, &val, lock);
else
ret = scoutfs_item_prev(sb, &key, &first, &val, lock);
if (ret >= 0 && ret != expected)
ret = -EIO;
if (ret == expected)