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erofs: decouple struct erofs_anon_fs_type

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- Move the `struct erofs_anon_fs_type` to super.c and expose it
    in preparation for the upcoming page cache share feature;

  - Remove the `.owner` field, as they are all internal mounts and
    fully managed by EROFS.  Retaining `.owner` would unnecessarily
    increment module reference counts, preventing the EROFS kernel
    module from being unloaded.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2026-01-23 01:31:24 +00:00
parent 3736449704
commit 4340ca47c3
3 changed files with 16 additions and 13 deletions
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13
fs/erofs/fscache.c
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@ -3,7 +3,6 @@
* Copyright (C) 2022, Alibaba Cloud
* Copyright (C) 2022, Bytedance Inc. All rights reserved.
*/
#include <linux/pseudo_fs.h>
#include <linux/fscache.h>
#include "internal.h"
@ -13,18 +12,6 @@ static LIST_HEAD(erofs_domain_list);
static LIST_HEAD(erofs_domain_cookies_list);
static struct vfsmount *erofs_pseudo_mnt;
static int erofs_anon_init_fs_context(struct fs_context *fc)
{
return init_pseudo(fc, EROFS_SUPER_MAGIC) ? 0 : -ENOMEM;
}
static struct file_system_type erofs_anon_fs_type = {
.owner = THIS_MODULE,
.name = "pseudo_erofs",
.init_fs_context = erofs_anon_init_fs_context,
.kill_sb = kill_anon_super,
};
struct erofs_fscache_io {
struct netfs_cache_resources cres;
struct iov_iter iter;

2
fs/erofs/internal.h
View File

@ -185,6 +185,8 @@ static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi)
return IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && sbi->dif0.file;
}
extern struct file_system_type erofs_anon_fs_type;
static inline bool erofs_is_fscache_mode(struct super_block *sb)
{
return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&

14
fs/erofs/super.c
View File

@ -11,6 +11,7 @@
#include <linux/fs_parser.h>
#include <linux/exportfs.h>
#include <linux/backing-dev.h>
#include <linux/pseudo_fs.h>
#include "xattr.h"
#define CREATE_TRACE_POINTS
@ -945,6 +946,19 @@ static struct file_system_type erofs_fs_type = {
};
MODULE_ALIAS_FS("erofs");
#if defined(CONFIG_EROFS_FS_ONDEMAND)
static int erofs_anon_init_fs_context(struct fs_context *fc)
{
return init_pseudo(fc, EROFS_SUPER_MAGIC) ? 0 : -ENOMEM;
}
struct file_system_type erofs_anon_fs_type = {
.name = "pseudo_erofs",
.init_fs_context = erofs_anon_init_fs_context,
.kill_sb = kill_anon_super,
};
#endif
static int __init erofs_module_init(void)
{
int err;