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bcachefs: Use struct_size()

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Use struct_size() instead of hand writing it.
This is less verbose and more robust.

While at it, prepare for the coming implementation by GCC and Clang of the
__counted_by attribute. Flexible array members annotated with __counted_by
can have their accesses bounds-checked at run-time checking via
CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for
strcpy/memcpy-family functions).

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Christophe JAILLET 2023-10-01 09:13:54 +02:00 committed by Kent Overstreet
parent 69d1f052d1
commit c2d81c2412
2 changed files with 2 additions and 3 deletions
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3
fs/bcachefs/disk_groups.c
View file

@ -163,8 +163,7 @@ int bch2_sb_disk_groups_to_cpu(struct bch_fs *c)
if (!groups)
return 0;
cpu_g = kzalloc(sizeof(*cpu_g) +
sizeof(cpu_g->entries[0]) * nr_groups, GFP_KERNEL);
cpu_g = kzalloc(struct_size(cpu_g, entries, nr_groups), GFP_KERNEL);
if (!cpu_g)
return -BCH_ERR_ENOMEM_disk_groups_to_cpu;

2
fs/bcachefs/super_types.h
View file

@ -46,7 +46,7 @@ struct bch_disk_group_cpu {
struct bch_disk_groups_cpu {
struct rcu_head rcu;
unsigned nr;
struct bch_disk_group_cpu entries[];
struct bch_disk_group_cpu entries[] __counted_by(nr);
};
#endif /* _BCACHEFS_SUPER_TYPES_H */