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fs: use kmem_cache_create_rcu()

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Switch to the new kmem_cache_create_rcu() helper which allows us to use
a custom free pointer offset avoiding the need to have an external free
pointer which would grow struct file behind our backs.

Link: https://lore.kernel.org/r/20240828-work-kmem_cache-rcu-v3-3-5460bc1f09f6@kernel.org
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-08-28 12:56:25 +02:00
parent d345bd2e98
commit ea566e18b4
2 changed files with 5 additions and 3 deletions
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6
fs/file_table.c
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@ -511,9 +511,9 @@ EXPORT_SYMBOL(__fput_sync);
void __init files_init(void)
{
filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,
SLAB_TYPESAFE_BY_RCU | SLAB_HWCACHE_ALIGN |
SLAB_PANIC | SLAB_ACCOUNT, NULL);
filp_cachep = kmem_cache_create_rcu("filp", sizeof(struct file),
offsetof(struct file, f_freeptr),
SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT);
percpu_counter_init(&nr_files, 0, GFP_KERNEL);
}

2
include/linux/fs.h
View File

@ -1011,6 +1011,7 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
* @f_task_work: task work entry point
* @f_llist: work queue entrypoint
* @f_ra: file's readahead state
* @f_freeptr: Pointer used by SLAB_TYPESAFE_BY_RCU file cache (don't touch.)
*/
struct file {
atomic_long_t f_count;
@ -1042,6 +1043,7 @@ struct file {
struct callback_head f_task_work;
struct llist_node f_llist;
struct file_ra_state f_ra;
freeptr_t f_freeptr;
};
/* --- cacheline 3 boundary (192 bytes) --- */
} __randomize_layout