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btrfs: Add helper to check the btrfs header 

This helper is used in a few places to help the debugging. As
conservative approach the error is only logged.
This does not impact the error handling.

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Goffredo Baroncelli 2018-10-22 19:29:32 +02:00 committed by Daniel Kiper
parent 81e2673fb6
commit 846f7a8310
1 changed files with 23 additions and 1 deletions
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24
grub-core/fs/btrfs.c
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@ -77,7 +77,8 @@ struct btrfs_header
{
grub_btrfs_checksum_t checksum;
grub_btrfs_uuid_t uuid;
grub_uint8_t dummy[0x30];
grub_uint64_t bytenr;
grub_uint8_t dummy[0x28];
grub_uint32_t nitems;
grub_uint8_t level;
} GRUB_PACKED;
@ -286,6 +287,25 @@ free_iterator (struct grub_btrfs_leaf_descriptor *desc)
grub_free (desc->data);
}
static grub_err_t
check_btrfs_header (struct grub_btrfs_data *data, struct btrfs_header *header,
grub_disk_addr_t addr)
{
if (grub_le_to_cpu64 (header->bytenr) != addr)
{
grub_dprintf ("btrfs", "btrfs_header.bytenr is not equal node addr\n");
return grub_error (GRUB_ERR_BAD_FS,
"header bytenr is not equal node addr");
}
if (grub_memcmp (data->sblock.uuid, header->uuid, sizeof(grub_btrfs_uuid_t)))
{
grub_dprintf ("btrfs", "btrfs_header.uuid doesn't match sblock uuid\n");
return grub_error (GRUB_ERR_BAD_FS,
"header uuid doesn't match sblock uuid");
}
return GRUB_ERR_NONE;
}
static grub_err_t
save_ref (struct grub_btrfs_leaf_descriptor *desc,
grub_disk_addr_t addr, unsigned i, unsigned m, int l)
@ -341,6 +361,7 @@ next (struct grub_btrfs_data *data,
err = grub_btrfs_read_logical (data, grub_le_to_cpu64 (node.addr),
&head, sizeof (head), 0);
check_btrfs_header (data, &head, grub_le_to_cpu64 (node.addr));
if (err)
return -err;
@ -402,6 +423,7 @@ lower_bound (struct grub_btrfs_data *data,
/* FIXME: preread few nodes into buffer. */
err = grub_btrfs_read_logical (data, addr, &head, sizeof (head),
recursion_depth + 1);
check_btrfs_header (data, &head, addr);
if (err)
return err;
addr += sizeof (head);