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authorJia Zhu2022-09-18 12:34:56 +0800
committerGao Xiang2022-09-20 08:01:54 +0800
commit2ef164414123fcf574aff7a0be5f71f7e60a3fec (patch)
treeaefc6bba528e9dfa4f8e9f47103b4fd8ff78b83e /fs/erofs
parent7d41963759feb3cfa4c1164b8b9db5d1f055932d (diff)
erofs: introduce 'domain_id' mount option
Introduce 'domain_id' mount option to enable shared domain sementics. In which case, the related cookie is shared if two mountpoints in the same domain have the same data blob. Users could specify the name of domain by this mount option. Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com> Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com> Link: https://lore.kernel.org/r/20220918043456.147-7-zhujia.zj@bytedance.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs')
-rw-r--r--fs/erofs/super.c17
-rw-r--r--fs/erofs/sysfs.c19
2 files changed, 34 insertions, 2 deletions
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index ab746181ae08..9f7fe6c04e65 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -440,6 +440,7 @@ enum {
Opt_dax_enum,
Opt_device,
Opt_fsid,
+ Opt_domain_id,
Opt_err
};
@@ -465,6 +466,7 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = {
fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
fsparam_string("device", Opt_device),
fsparam_string("fsid", Opt_fsid),
+ fsparam_string("domain_id", Opt_domain_id),
{}
};
@@ -570,6 +572,16 @@ static int erofs_fc_parse_param(struct fs_context *fc,
errorfc(fc, "fsid option not supported");
#endif
break;
+ case Opt_domain_id:
+#ifdef CONFIG_EROFS_FS_ONDEMAND
+ kfree(ctx->opt.domain_id);
+ ctx->opt.domain_id = kstrdup(param->string, GFP_KERNEL);
+ if (!ctx->opt.domain_id)
+ return -ENOMEM;
+#else
+ errorfc(fc, "domain_id option not supported");
+#endif
+ break;
default:
return -ENOPARAM;
}
@@ -702,6 +714,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_fs_info = sbi;
sbi->opt = ctx->opt;
ctx->opt.fsid = NULL;
+ ctx->opt.domain_id = NULL;
sbi->devs = ctx->devs;
ctx->devs = NULL;
@@ -846,6 +859,7 @@ static void erofs_fc_free(struct fs_context *fc)
erofs_free_dev_context(ctx->devs);
kfree(ctx->opt.fsid);
+ kfree(ctx->opt.domain_id);
kfree(ctx);
}
@@ -916,6 +930,7 @@ static void erofs_kill_sb(struct super_block *sb)
fs_put_dax(sbi->dax_dev, NULL);
erofs_fscache_unregister_fs(sb);
kfree(sbi->opt.fsid);
+ kfree(sbi->opt.domain_id);
kfree(sbi);
sb->s_fs_info = NULL;
}
@@ -1068,6 +1083,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
#ifdef CONFIG_EROFS_FS_ONDEMAND
if (opt->fsid)
seq_printf(seq, ",fsid=%s", opt->fsid);
+ if (opt->domain_id)
+ seq_printf(seq, ",domain_id=%s", opt->domain_id);
#endif
return 0;
}
diff --git a/fs/erofs/sysfs.c b/fs/erofs/sysfs.c
index c1383e508bbe..341fb43ad587 100644
--- a/fs/erofs/sysfs.c
+++ b/fs/erofs/sysfs.c
@@ -201,12 +201,27 @@ static struct kobject erofs_feat = {
int erofs_register_sysfs(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
+ char *name;
+ char *str = NULL;
int err;
+ if (erofs_is_fscache_mode(sb)) {
+ if (sbi->opt.domain_id) {
+ str = kasprintf(GFP_KERNEL, "%s,%s", sbi->opt.domain_id,
+ sbi->opt.fsid);
+ if (!str)
+ return -ENOMEM;
+ name = str;
+ } else {
+ name = sbi->opt.fsid;
+ }
+ } else {
+ name = sb->s_id;
+ }
sbi->s_kobj.kset = &erofs_root;
init_completion(&sbi->s_kobj_unregister);
- err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s",
- erofs_is_fscache_mode(sb) ? sbi->opt.fsid : sb->s_id);
+ err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s", name);
+ kfree(str);
if (err)
goto put_sb_kobj;
return 0;