On Wed, Apr 06, 2022 at 03:56:06PM +0800, Jeffle Xu wrote:
> Registers fscache context for primary data blob. Also move the
> initialization of s_op and related fields forward, since anonymous
> inode will be allocated under the super block when registering the
> fscache context.
>
> Something worth mentioning about the cleanup routine.
>
> 1. The fscache context will instantiate anonymous inodes under the super
> block. Release these anonymous inodes when .put_super() is called, or
> we'll get "VFS: Busy inodes after unmount." warning.
>
> 2. The fscache context is initialized prior to the root inode. If
> .kill_sb() is called when mount failed, .put_super() won't be called
> when root inode has not been initialized yet. Thus .kill_sb() shall
> also contain the cleanup routine.
>
> Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Thanks,
Gao Xiang
> ---
> fs/erofs/internal.h | 1 +
> fs/erofs/super.c | 15 +++++++++++----
> 2 files changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
> index 3a4a344cfed3..eb37b33bce37 100644
> --- a/fs/erofs/internal.h
> +++ b/fs/erofs/internal.h
> @@ -155,6 +155,7 @@ struct erofs_sb_info {
>
> /* fscache support */
> struct fscache_volume *volume;
> + struct erofs_fscache *s_fscache;
> };
>
> #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 6590ed1b7d3b..9498b899b73b 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -585,6 +585,9 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
> int err;
>
> sb->s_magic = EROFS_SUPER_MAGIC;
> + sb->s_flags |= SB_RDONLY | SB_NOATIME;
> + sb->s_maxbytes = MAX_LFS_FILESIZE;
> + sb->s_op = &erofs_sops;
>
> if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
> erofs_err(sb, "failed to set erofs blksize");
> @@ -605,6 +608,11 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
> err = erofs_fscache_register_fs(sb);
> if (err)
> return err;
> +
> + err = erofs_fscache_register_cookie(sb, &sbi->s_fscache,
> + sbi->opt.fsid, true);
> + if (err)
> + return err;
> }
>
> err = erofs_read_superblock(sb);
> @@ -619,11 +627,8 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
> clear_opt(&sbi->opt, DAX_ALWAYS);
> }
> }
> - sb->s_flags |= SB_RDONLY | SB_NOATIME;
> - sb->s_maxbytes = MAX_LFS_FILESIZE;
> - sb->s_time_gran = 1;
>
> - sb->s_op = &erofs_sops;
> + sb->s_time_gran = 1;
> sb->s_xattr = erofs_xattr_handlers;
>
> if (test_opt(&sbi->opt, POSIX_ACL))
> @@ -763,6 +768,7 @@ static void erofs_kill_sb(struct super_block *sb)
>
> erofs_free_dev_context(sbi->devs);
> fs_put_dax(sbi->dax_dev);
> + erofs_fscache_unregister_cookie(&sbi->s_fscache);
> erofs_fscache_unregister_fs(sb);
> kfree(sbi);
> sb->s_fs_info = NULL;
> @@ -781,6 +787,7 @@ static void erofs_put_super(struct super_block *sb)
> iput(sbi->managed_cache);
> sbi->managed_cache = NULL;
> #endif
> + erofs_fscache_unregister_cookie(&sbi->s_fscache);
> }
>
> static struct file_system_type erofs_fs_type = {
> --
> 2.27.0
>
--
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