mirrors/scoutfs
1
0
Fork 0
mirror of https://github.com/versity/scoutfs.git synced 2026-01-08 21:03:12 +00:00
Code Issues Packages Projects Releases Wiki Activity

Add scoutfs_alloc_extents_cb()

Browse Source 
Add an allocator call for getting a callback for all the extents in
btree items in an allocator root.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2021-05-17 12:48:35 -07:00
parent 9de3ae6dcb
commit bc4975fad4
2 changed files with 65 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
kmod/src/alloc.c
View File

@@ -1258,3 +1258,63 @@ out:
kfree(sc);
return ret;
}
struct foreach_cb_args {
scoutfs_alloc_extent_cb_t cb;
void *cb_arg;
};
static int alloc_btree_extent_item_cb(struct super_block *sb, struct scoutfs_key *key,
void *val, int val_len, void *arg)
{
struct foreach_cb_args *cba = arg;
struct scoutfs_extent ext;
if (key->sk_zone != SCOUTFS_FREE_EXTENT_BLKNO_ZONE)
return -ENOENT;
ext_from_key(&ext, key);
cba->cb(sb, cba->cb_arg, &ext);
return 0;
}
/*
* Call the caller's callback on each extent stored in the allocator's
* btree. The callback sees extents called in order by starting blkno.
*/
int scoutfs_alloc_extents_cb(struct super_block *sb, struct scoutfs_alloc_root *root,
scoutfs_alloc_extent_cb_t cb, void *cb_arg)
{
struct foreach_cb_args cba = {
.cb = cb,
.cb_arg = cb_arg,
};
struct scoutfs_key start;
struct scoutfs_key end;
struct scoutfs_key key;
int ret;
init_ext_key(&key, SCOUTFS_FREE_EXTENT_BLKNO_ZONE, 0, 1);
for (;;) {
/* will stop at order items before getting stuck in final block */
BUILD_BUG_ON(SCOUTFS_FREE_EXTENT_BLKNO_ZONE > SCOUTFS_FREE_EXTENT_ORDER_ZONE);
init_ext_key(&start, SCOUTFS_FREE_EXTENT_BLKNO_ZONE, 0, 1);
init_ext_key(&end, SCOUTFS_FREE_EXTENT_ORDER_ZONE, 0, 1);
ret = scoutfs_btree_read_items(sb, &root->root, &key, &start, &end,
alloc_btree_extent_item_cb, &cba);
if (ret < 0 || end.sk_zone != SCOUTFS_FREE_EXTENT_BLKNO_ZONE) {
if (ret == -ENOENT)
ret = 0;
break;
}
key = end;
scoutfs_key_inc(&key);
}
return ret;
}

5
kmod/src/alloc.h
View File

@@ -153,4 +153,9 @@ typedef int (*scoutfs_alloc_foreach_cb_t)(struct super_block *sb, void *arg,
int scoutfs_alloc_foreach(struct super_block *sb,
scoutfs_alloc_foreach_cb_t cb, void *arg);
typedef void (*scoutfs_alloc_extent_cb_t)(struct super_block *sb, void *cb_arg,
struct scoutfs_extent *ext);
int scoutfs_alloc_extents_cb(struct super_block *sb, struct scoutfs_alloc_root *root,
scoutfs_alloc_extent_cb_t cb, void *cb_arg);
#endif