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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /include/linux/blockgroup_lock.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/linux/blockgroup_lock.h')
-rw-r--r-- | include/linux/blockgroup_lock.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/linux/blockgroup_lock.h b/include/linux/blockgroup_lock.h new file mode 100644 index 000000000..511ab123a --- /dev/null +++ b/include/linux/blockgroup_lock.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_BLOCKGROUP_LOCK_H +#define _LINUX_BLOCKGROUP_LOCK_H +/* + * Per-blockgroup locking for ext2 and ext3. + * + * Simple hashed spinlocking. + */ + +#include <linux/spinlock.h> +#include <linux/cache.h> + +#ifdef CONFIG_SMP +#define NR_BG_LOCKS (4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32)) +#else +#define NR_BG_LOCKS 1 +#endif + +struct bgl_lock { + spinlock_t lock; +} ____cacheline_aligned_in_smp; + +struct blockgroup_lock { + struct bgl_lock locks[NR_BG_LOCKS]; +}; + +static inline void bgl_lock_init(struct blockgroup_lock *bgl) +{ + int i; + + for (i = 0; i < NR_BG_LOCKS; i++) + spin_lock_init(&bgl->locks[i].lock); +} + +static inline spinlock_t * +bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group) +{ + return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock; +} + +#endif |