From: Jia Zhu <zhujia.zj@bytedance.com>
To: linux-erofs@lists.ozlabs.org
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
yinxin.x@bytedance.com
Subject: [PATCH V6 5/6] erofs: Support sharing cookies in the same domain
Date: Sun, 18 Sep 2022 19:01:50 +0800 [thread overview]
Message-ID: <20220918110150.6338-1-zhujia.zj@bytedance.com> (raw)
In-Reply-To: <20220918043456.147-6-zhujia.zj@bytedance.com>
Several erofs filesystems can belong to one domain, and data blobs can
be shared among these erofs filesystems of same domain.
Users could specify domain_id mount option to create or join into a
domain.
Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/fscache.c | 99 ++++++++++++++++++++++++++++++++++++++++++---
fs/erofs/internal.h | 3 ++
2 files changed, 96 insertions(+), 6 deletions(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 4a7346b9fa73..ce9301a890f9 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -7,6 +7,7 @@
#include "internal.h"
static DEFINE_MUTEX(erofs_domain_list_lock);
+static DEFINE_MUTEX(erofs_domain_cookies_lock);
static LIST_HEAD(erofs_domain_list);
static struct vfsmount *erofs_pseudo_mnt;
@@ -527,8 +528,9 @@ static int erofs_fscache_register_domain(struct super_block *sb)
return err;
}
-struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
- char *name, bool need_inode)
+static
+struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
+ char *name, bool need_inode)
{
struct fscache_volume *volume = EROFS_SB(sb)->volume;
struct erofs_fscache *ctx;
@@ -577,17 +579,102 @@ struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
return ERR_PTR(ret);
}
-void erofs_fscache_unregister_cookie(struct erofs_fscache *ctx)
+static void erofs_fscache_relinquish_cookie(struct erofs_fscache *ctx)
{
- if (!ctx)
- return;
-
fscache_unuse_cookie(ctx->cookie, NULL, NULL);
fscache_relinquish_cookie(ctx->cookie, false);
iput(ctx->inode);
+ kfree(ctx->name);
kfree(ctx);
}
+static
+struct erofs_fscache *erofs_fscache_domain_init_cookie(struct super_block *sb,
+ char *name, bool need_inode)
+{
+ int err;
+ struct inode *inode;
+ struct erofs_fscache *ctx;
+ struct erofs_domain *domain = EROFS_SB(sb)->domain;
+
+ ctx = erofs_fscache_acquire_cookie(sb, name, need_inode);
+ if (IS_ERR(ctx))
+ return ctx;
+
+ ctx->name = kstrdup(name, GFP_KERNEL);
+ if (!ctx->name) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ inode = new_inode(erofs_pseudo_mnt->mnt_sb);
+ if (!inode) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ ctx->domain = domain;
+ ctx->anon_inode = inode;
+ inode->i_private = ctx;
+ refcount_inc(&domain->ref);
+ return ctx;
+out:
+ erofs_fscache_relinquish_cookie(ctx);
+ return ERR_PTR(err);
+}
+
+static
+struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb,
+ char *name, bool need_inode)
+{
+ struct inode *inode;
+ struct erofs_fscache *ctx;
+ struct erofs_domain *domain = EROFS_SB(sb)->domain;
+ struct super_block *psb = erofs_pseudo_mnt->mnt_sb;
+
+ mutex_lock(&erofs_domain_cookies_lock);
+ list_for_each_entry(inode, &psb->s_inodes, i_sb_list) {
+ ctx = inode->i_private;
+ if (!ctx || ctx->domain != domain || strcmp(ctx->name, name))
+ continue;
+ igrab(inode);
+ mutex_unlock(&erofs_domain_cookies_lock);
+ return ctx;
+ }
+ ctx = erofs_fscache_domain_init_cookie(sb, name, need_inode);
+ mutex_unlock(&erofs_domain_cookies_lock);
+ return ctx;
+}
+
+struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
+ char *name, bool need_inode)
+{
+ if (EROFS_SB(sb)->opt.domain_id)
+ return erofs_domain_register_cookie(sb, name, need_inode);
+ return erofs_fscache_acquire_cookie(sb, name, need_inode);
+}
+
+void erofs_fscache_unregister_cookie(struct erofs_fscache *ctx)
+{
+ bool drop;
+ struct erofs_domain *domain;
+
+ if (!ctx)
+ return;
+ domain = ctx->domain;
+ if (domain) {
+ mutex_lock(&erofs_domain_cookies_lock);
+ drop = atomic_read(&ctx->anon_inode->i_count) == 1;
+ iput(ctx->anon_inode);
+ mutex_unlock(&erofs_domain_cookies_lock);
+ if (!drop)
+ return;
+ }
+
+ erofs_fscache_relinquish_cookie(ctx);
+ erofs_fscache_domain_put(domain);
+}
+
int erofs_fscache_register_fs(struct super_block *sb)
{
int ret;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 273fb35170e2..0f63830c9056 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -109,6 +109,9 @@ struct erofs_domain {
struct erofs_fscache {
struct fscache_cookie *cookie;
struct inode *inode;
+ struct inode *anon_inode;
+ struct erofs_domain *domain;
+ char *name;
};
struct erofs_sb_info {
--
2.20.1
next prev parent reply other threads:[~2022-09-18 11:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-18 4:34 [PATCH V6 0/6] Introduce erofs shared domain Jia Zhu
2022-09-18 4:34 ` [PATCH V6 1/6] erofs: use kill_anon_super() to kill super in fscache mode Jia Zhu
2022-09-18 4:34 ` [PATCH V6 2/6] erofs: code clean up for fscache Jia Zhu
2022-09-18 4:34 ` [PATCH V6 3/6] erofs: introduce fscache-based domain Jia Zhu
2022-09-18 4:34 ` [PATCH V6 4/6] erofs: introduce a pseudo mnt to manage shared cookies Jia Zhu
2022-09-18 4:34 ` [PATCH V6 5/6] erofs: Support sharing cookies in the same domain Jia Zhu
2022-09-18 11:01 ` Jia Zhu [this message]
2022-09-18 4:34 ` [PATCH V6 6/6] erofs: introduce 'domain_id' mount option Jia Zhu
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