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btrfs-progs: update btrfs_read_sys_array to match kernel implementation 

There are some sanity checks missing on both sides, kernel/userspace.
Preparation to port the missing changes.

Sync code with parent of kernel commit
1ffb22cf8c322bbfea6b35fe23d025841b49fede ("btrfs: cleanup, rename a few
variables in btrfs_read_sys_array")

This effectively reverts progs commit
be96777126 ("btrfs-progs: Cleanup unneeded
extra variant in btrfs_read_sys_array") so we can apply more of the
kernel patches.

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2015-11-30 15:57:36 +01:00
parent 16e240eca7
commit 9c655bfc1c
1 changed files with 16 additions and 15 deletions
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31
volumes.c
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@ -1795,12 +1795,14 @@ int btrfs_read_sys_array(struct btrfs_root *root)
struct extent_buffer *sb;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
struct btrfs_key key;
u32 num_stripes;
u32 len = 0;
u8 *ptr;
u8 *array_end;
unsigned long sb_ptr;
int ret = 0;
u32 num_stripes;
u32 array_size;
u32 len = 0;
u32 cur;
struct btrfs_key key;
sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
BTRFS_SUPER_INFO_SIZE);
@ -1808,25 +1810,22 @@ int btrfs_read_sys_array(struct btrfs_root *root)
return -ENOMEM;
btrfs_set_buffer_uptodate(sb);
write_extent_buffer(sb, super_copy, 0, sizeof(*super_copy));
array_end = ((u8 *)super_copy->sys_chunk_array) +
btrfs_super_sys_array_size(super_copy);
array_size = btrfs_super_sys_array_size(super_copy);
/*
* we do this loop twice, once for the device items and
* once for all of the chunks. This way there are device
* structs filled in for every chunk
*/
ptr = super_copy->sys_chunk_array;
sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
cur = 0;
while (ptr < array_end) {
while (cur < array_size) {
disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
len = sizeof(*disk_key);
ptr += len;
len = sizeof(*disk_key); ptr += len;
sb_ptr += len;
cur += len;
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)(ptr - (u8 *)super_copy);
chunk = (struct btrfs_chunk *)sb_ptr;
ret = read_one_chunk(root, &key, sb, chunk, -1);
if (ret)
break;
@ -1836,6 +1835,8 @@ int btrfs_read_sys_array(struct btrfs_root *root)
BUG();
}
ptr += len;
sb_ptr += len;
cur += len;
}
free_extent_buffer(sb);
return ret;