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btrfs: move leaf_data_end into ctree.c

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This is only used in ctree.c, with the exception of zero'ing out extent
buffers we're getting ready to write out.  In theory we shouldn't have
an extent buffer with 0 items that we're writing out, however I'd rather
be safe than sorry so open code it in extent_io.c, and then copy the
helper into ctree.c.  This will make it easier to sync accessors.[ch]
into btrfs-progs, as this requires a helper that isn't defined in
accessors.h.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-11-15 11:16:11 -05:00 committed by David Sterba
parent 1fe5ebc4e1
commit 3a3178c7f7
3 changed files with 18 additions and 14 deletions
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13
fs/btrfs/accessors.h
View File

@ -897,19 +897,6 @@ const char *btrfs_super_csum_name(u16 csum_type);
const char *btrfs_super_csum_driver(u16 csum_type);
size_t __attribute_const__ btrfs_get_num_csums(void);
/*
* The leaf data grows from end-to-front in the node. this returns the address
* of the start of the last item, which is the stop of the leaf data stack.
*/
static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
{
u32 nr = btrfs_header_nritems(leaf);
if (nr == 0)
return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
return btrfs_item_offset(leaf, nr - 1);
}
/* struct btrfs_file_extent_item */
BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
type, 8);

13
fs/btrfs/ctree.c
View File

@ -51,6 +51,19 @@ static const struct btrfs_csums {
.driver = "blake2b-256" },
};
/*
* The leaf data grows from end-to-front in the node. this returns the address
* of the start of the last item, which is the stop of the leaf data stack.
*/
static unsigned int leaf_data_end(const struct extent_buffer *leaf)
{
u32 nr = btrfs_header_nritems(leaf);
if (nr == 0)
return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
return btrfs_item_offset(leaf, nr - 1);
}
int btrfs_super_csum_size(const struct btrfs_super_block *s)
{
u16 t = btrfs_super_csum_type(s);

6
fs/btrfs/extent_io.c
View File

@ -2537,7 +2537,11 @@ static void prepare_eb_write(struct extent_buffer *eb)
* header 0 1 2 .. N ... data_N .. data_2 data_1 data_0
*/
start = btrfs_item_nr_offset(nritems);
end = BTRFS_LEAF_DATA_OFFSET + leaf_data_end(eb);
end = BTRFS_LEAF_DATA_OFFSET;
if (nritems == 0)
end += BTRFS_LEAF_DATA_SIZE(eb->fs_info);
else
end += btrfs_item_offset(eb, nritems - 1);
memzero_extent_buffer(eb, start, end - start);
}
}