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| author | Jia Zhu <zhujia.zj@bytedance.com> | 2022-09-18 12:34:54 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-20 08:01:54 +0800 |
| commit | a9849560c55e9e4ab9c53d073363dd6e19ec06ef (patch) | |
| tree | 9bcce3b3d532a51f4304c02dd5bf170e35743688 /fs/erofs/super.c | |
| parent | 8b7adf1dff3d5baf687acda936f193f80b7e0179 (diff) | |
| download | lwn-a9849560c55e9e4ab9c53d073363dd6e19ec06ef.tar.gz lwn-a9849560c55e9e4ab9c53d073363dd6e19ec06ef.zip | |
erofs: introduce a pseudo mnt to manage shared cookies
Use a pseudo mnt to manage shared cookies.
Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220918043456.147-5-zhujia.zj@bytedance.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/super.c')
| -rw-r--r-- | fs/erofs/super.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 884e7ed3d760..ab746181ae08 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -676,6 +676,13 @@ static const struct export_operations erofs_export_ops = { .get_parent = erofs_get_parent, }; +static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_context *fc) +{ + static const struct tree_descr empty_descr = {""}; + + return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr); +} + static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) { struct inode *inode; @@ -776,6 +783,11 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) return 0; } +static int erofs_fc_anon_get_tree(struct fs_context *fc) +{ + return get_tree_nodev(fc, erofs_fc_fill_pseudo_super); +} + static int erofs_fc_get_tree(struct fs_context *fc) { struct erofs_fs_context *ctx = fc->fs_private; @@ -844,10 +856,21 @@ static const struct fs_context_operations erofs_context_ops = { .free = erofs_fc_free, }; +static const struct fs_context_operations erofs_anon_context_ops = { + .get_tree = erofs_fc_anon_get_tree, +}; + static int erofs_init_fs_context(struct fs_context *fc) { - struct erofs_fs_context *ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + struct erofs_fs_context *ctx; + + /* pseudo mount for anon inodes */ + if (fc->sb_flags & SB_KERNMOUNT) { + fc->ops = &erofs_anon_context_ops; + return 0; + } + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL); @@ -874,6 +897,12 @@ static void erofs_kill_sb(struct super_block *sb) WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC); + /* pseudo mount for anon inodes */ + if (sb->s_flags & SB_KERNMOUNT) { + kill_anon_super(sb); + return; + } + if (erofs_is_fscache_mode(sb)) kill_anon_super(sb); else @@ -907,7 +936,7 @@ static void erofs_put_super(struct super_block *sb) erofs_fscache_unregister_fs(sb); } -static struct file_system_type erofs_fs_type = { +struct file_system_type erofs_fs_type = { .owner = THIS_MODULE, .name = "erofs", .init_fs_context = erofs_init_fs_context, |