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Btrfs: Add simple stripe size parameter

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-11-30 11:30:34 -05:00
parent 00f5c795fc
commit 87ee04eb0f
3 changed files with 43 additions and 13 deletions
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36
fs/btrfs/extent-tree.c
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@@ -932,6 +932,13 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
return ret ? ret : pending_ret;
}
static u64 stripe_align(struct btrfs_root *root, u64 val)
{
u64 mask = ((u64)root->stripesize - 1);
u64 ret = (val + mask) & ~mask;
return ret;
}
/*
* walks the btree of allocated extents and find a hole of a given size.
* The key ins is changed to record the hole:
@@ -948,8 +955,9 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
{
struct btrfs_path *path;
struct btrfs_key key;
int ret;
u64 hole_size = 0;
u64 aligned;
int ret;
int slot = 0;
u64 last_byte = 0;
u64 orig_search_start = search_start;
@@ -990,6 +998,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
check_failed:
search_start = find_search_start(root, &block_group, search_start,
total_needed, data, full_scan);
search_start = stripe_align(root, search_start);
cached_start = search_start;
btrfs_init_path(path);
ins->objectid = search_start;
@@ -1039,13 +1048,23 @@ check_failed:
search_start = max(search_start,
block_group->key.objectid);
if (!start_found) {
ins->objectid = search_start;
ins->offset = search_end - search_start;
aligned = stripe_align(root, search_start);
ins->objectid = aligned;
if (aligned >= search_end) {
ret = -ENOSPC;
goto error;
}
ins->offset = search_end - aligned;
start_found = 1;
goto check_pending;
}
ins->objectid = last_byte > search_start ?
last_byte : search_start;
ins->objectid = stripe_align(root,
last_byte > search_start ?
last_byte : search_start);
if (search_end <= ins->objectid) {
ret = -ENOSPC;
goto error;
}
ins->offset = search_end - ins->objectid;
BUG_ON(ins->objectid >= search_end);
goto check_pending;
@@ -1056,9 +1075,10 @@ check_failed:
start_found) {
if (last_byte < search_start)
last_byte = search_start;
hole_size = key.objectid - last_byte;
if (hole_size >= num_bytes) {
ins->objectid = last_byte;
aligned = stripe_align(root, last_byte);
hole_size = key.objectid - aligned;
if (key.objectid > aligned && hole_size >= num_bytes) {
ins->objectid = aligned;
ins->offset = hole_size;
goto check_pending;
}