mirror of
https://github.com/torvalds/linux
synced 2024-09-29 16:00:27 +00:00
c6be2bd0a5
A new fscache based mode is going to be introduced for erofs, in which case on-demand read semantics is implemented through fscache. As the first step, register fscache volume for each erofs filesystem. That means, data blobs can not be shared among erofs filesystems. In the following iteration, we are going to introduce the domain semantics, in which case several erofs filesystems can belong to one domain, and data blobs can be shared among these erofs filesystems of one domain. Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20220425122143.56815-12-jefflexu@linux.alibaba.com Acked-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
38 lines
834 B
C
38 lines
834 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2022, Alibaba Cloud
|
|
*/
|
|
#include <linux/fscache.h>
|
|
#include "internal.h"
|
|
|
|
int erofs_fscache_register_fs(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
struct fscache_volume *volume;
|
|
char *name;
|
|
int ret = 0;
|
|
|
|
name = kasprintf(GFP_KERNEL, "erofs,%s", sbi->opt.fsid);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
volume = fscache_acquire_volume(name, NULL, NULL, 0);
|
|
if (IS_ERR_OR_NULL(volume)) {
|
|
erofs_err(sb, "failed to register volume for %s", name);
|
|
ret = volume ? PTR_ERR(volume) : -EOPNOTSUPP;
|
|
volume = NULL;
|
|
}
|
|
|
|
sbi->volume = volume;
|
|
kfree(name);
|
|
return ret;
|
|
}
|
|
|
|
void erofs_fscache_unregister_fs(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
|
|
fscache_relinquish_volume(sbi->volume, NULL, false);
|
|
sbi->volume = NULL;
|
|
}
|