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dcache: use kmalloc_flex() in __d_alloc

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Use kmalloc_flex() when allocating a new 'struct external_name' in
__d_alloc() to replace offsetof() and the open-coded size arithmetic,
and to keep the size type-safe.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20260417094238.551114-3-thorsten.blum@linux.dev
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jori Koolstra <jkoolstra@xs4all.nl>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Thorsten Blum 2026-04-17 11:42:40 +02:00 committed by Christian Brauner
parent 80008c75f4
commit 0447533fae
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 4 additions and 4 deletions
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8
fs/dcache.c
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@ -1820,10 +1820,10 @@ static struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name)
name = &slash_name;
dname = dentry->d_shortname.string;
} else if (name->len > DNAME_INLINE_LEN-1) {
size_t size = offsetof(struct external_name, name[1]);
struct external_name *p = kmalloc(size + name->len,
GFP_KERNEL_ACCOUNT |
__GFP_RECLAIMABLE);
struct external_name *p;
p = kmalloc_flex(*p, name, name->len + 1,
GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE);
if (!p) {
kmem_cache_free(dentry_cache, dentry);
return NULL;