Re: [PATCH -next] erofs: get rid of erofs_fs_context

From: Christian Brauner
Date: Fri Apr 19 2024 - 06:14:40 EST

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On Fri, Apr 19, 2024 at 11:14:59AM +0800, Baokun Li wrote:
> Instead of allocating the erofs_sb_info in get_tree() allocate it during
> init_fs_context() and after this erofs_fs_context is no longer needed,
> so replace ctx with sbi, no functional changes.
>
> Suggested-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
> ---
> Hi Gao Xiang,
> Hi Jingbo,
>
> I noticed that Christian's original patch has been merged into the next
> branch, so I'm sending this patch out separately.

An an accident on my part as I left it in the vfs.fixes branch. I expect
that the erofs tree will pick it up.

>
> Regards,
> Baokun
>
> fs/erofs/internal.h | 7 ---
> fs/erofs/super.c | 112 ++++++++++++++++++--------------------------
> 2 files changed, 46 insertions(+), 73 deletions(-)
>
> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
> index 116c1d5d1932..53ebba952a2f 100644
> --- a/fs/erofs/internal.h
> +++ b/fs/erofs/internal.h
> @@ -84,13 +84,6 @@ struct erofs_dev_context {
> bool flatdev;
> };
>
> -struct erofs_fs_context {
> - struct erofs_mount_opts opt;
> - struct erofs_dev_context *devs;
> - char *fsid;
> - char *domain_id;
> -};
> -
> /* all filesystem-wide lz4 configurations */
> struct erofs_sb_lz4_info {
> /* # of pages needed for EROFS lz4 rolling decompression */
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 4fc34b984e51..7172271290b9 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -370,18 +370,18 @@ static int erofs_read_superblock(struct super_block *sb)
> return ret;
> }
>
> -static void erofs_default_options(struct erofs_fs_context *ctx)
> +static void erofs_default_options(struct erofs_sb_info *sbi)
> {
> #ifdef CONFIG_EROFS_FS_ZIP
> - ctx->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
> - ctx->opt.max_sync_decompress_pages = 3;
> - ctx->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO;
> + sbi->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
> + sbi->opt.max_sync_decompress_pages = 3;
> + sbi->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO;
> #endif
> #ifdef CONFIG_EROFS_FS_XATTR
> - set_opt(&ctx->opt, XATTR_USER);
> + set_opt(&sbi->opt, XATTR_USER);
> #endif
> #ifdef CONFIG_EROFS_FS_POSIX_ACL
> - set_opt(&ctx->opt, POSIX_ACL);
> + set_opt(&sbi->opt, POSIX_ACL);
> #endif
> }
>
> @@ -426,16 +426,16 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = {
> static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
> {
> #ifdef CONFIG_FS_DAX
> - struct erofs_fs_context *ctx = fc->fs_private;
> + struct erofs_sb_info *sbi = fc->s_fs_info;
>
> switch (mode) {
> case EROFS_MOUNT_DAX_ALWAYS:
> - set_opt(&ctx->opt, DAX_ALWAYS);
> - clear_opt(&ctx->opt, DAX_NEVER);
> + set_opt(&sbi->opt, DAX_ALWAYS);
> + clear_opt(&sbi->opt, DAX_NEVER);
> return true;
> case EROFS_MOUNT_DAX_NEVER:
> - set_opt(&ctx->opt, DAX_NEVER);
> - clear_opt(&ctx->opt, DAX_ALWAYS);
> + set_opt(&sbi->opt, DAX_NEVER);
> + clear_opt(&sbi->opt, DAX_ALWAYS);
> return true;
> default:
> DBG_BUGON(1);
> @@ -450,7 +450,7 @@ static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
> static int erofs_fc_parse_param(struct fs_context *fc,
> struct fs_parameter *param)
> {
> - struct erofs_fs_context *ctx = fc->fs_private;
> + struct erofs_sb_info *sbi = fc->s_fs_info;
> struct fs_parse_result result;
> struct erofs_device_info *dif;
> int opt, ret;
> @@ -463,9 +463,9 @@ static int erofs_fc_parse_param(struct fs_context *fc,
> case Opt_user_xattr:
> #ifdef CONFIG_EROFS_FS_XATTR
> if (result.boolean)
> - set_opt(&ctx->opt, XATTR_USER);
> + set_opt(&sbi->opt, XATTR_USER);
> else
> - clear_opt(&ctx->opt, XATTR_USER);
> + clear_opt(&sbi->opt, XATTR_USER);
> #else
> errorfc(fc, "{,no}user_xattr options not supported");
> #endif
> @@ -473,16 +473,16 @@ static int erofs_fc_parse_param(struct fs_context *fc,
> case Opt_acl:
> #ifdef CONFIG_EROFS_FS_POSIX_ACL
> if (result.boolean)
> - set_opt(&ctx->opt, POSIX_ACL);
> + set_opt(&sbi->opt, POSIX_ACL);
> else
> - clear_opt(&ctx->opt, POSIX_ACL);
> + clear_opt(&sbi->opt, POSIX_ACL);
> #else
> errorfc(fc, "{,no}acl options not supported");
> #endif
> break;
> case Opt_cache_strategy:
> #ifdef CONFIG_EROFS_FS_ZIP
> - ctx->opt.cache_strategy = result.uint_32;
> + sbi->opt.cache_strategy = result.uint_32;
> #else
> errorfc(fc, "compression not supported, cache_strategy ignored");
> #endif
> @@ -504,27 +504,27 @@ static int erofs_fc_parse_param(struct fs_context *fc,
> kfree(dif);
> return -ENOMEM;
> }
> - down_write(&ctx->devs->rwsem);
> - ret = idr_alloc(&ctx->devs->tree, dif, 0, 0, GFP_KERNEL);
> - up_write(&ctx->devs->rwsem);
> + down_write(&sbi->devs->rwsem);
> + ret = idr_alloc(&sbi->devs->tree, dif, 0, 0, GFP_KERNEL);
> + up_write(&sbi->devs->rwsem);
> if (ret < 0) {
> kfree(dif->path);
> kfree(dif);
> return ret;
> }
> - ++ctx->devs->extra_devices;
> + ++sbi->devs->extra_devices;
> break;
> #ifdef CONFIG_EROFS_FS_ONDEMAND
> case Opt_fsid:
> - kfree(ctx->fsid);
> - ctx->fsid = kstrdup(param->string, GFP_KERNEL);
> - if (!ctx->fsid)
> + kfree(sbi->fsid);
> + sbi->fsid = kstrdup(param->string, GFP_KERNEL);
> + if (!sbi->fsid)
> return -ENOMEM;
> break;
> case Opt_domain_id:
> - kfree(ctx->domain_id);
> - ctx->domain_id = kstrdup(param->string, GFP_KERNEL);
> - if (!ctx->domain_id)
> + kfree(sbi->domain_id);
> + sbi->domain_id = kstrdup(param->string, GFP_KERNEL);
> + if (!sbi->domain_id)
> return -ENOMEM;
> break;
> #else
> @@ -582,7 +582,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
> {
> struct inode *inode;
> struct erofs_sb_info *sbi = EROFS_SB(sb);
> - struct erofs_fs_context *ctx = fc->fs_private;
> int err;
>
> sb->s_magic = EROFS_SUPER_MAGIC;
> @@ -590,14 +589,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
> sb->s_maxbytes = MAX_LFS_FILESIZE;
> sb->s_op = &erofs_sops;
>
> - sb->s_fs_info = sbi;
> - sbi->opt = ctx->opt;
> - sbi->devs = ctx->devs;
> - ctx->devs = NULL;
> - ctx->fsid = NULL;
> - sbi->domain_id = ctx->domain_id;
> - ctx->domain_id = NULL;
> -
> sbi->blkszbits = PAGE_SHIFT;
> if (erofs_is_fscache_mode(sb)) {
> sb->s_blocksize = PAGE_SIZE;
> @@ -701,15 +692,8 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
>
> static int erofs_fc_get_tree(struct fs_context *fc)
> {
> - struct erofs_fs_context *ctx = fc->fs_private;
> - struct erofs_sb_info *sbi;
> -
> - sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
> - if (!sbi)
> - return -ENOMEM;
> + struct erofs_sb_info *sbi = fc->s_fs_info;
>
> - fc->s_fs_info = sbi;
> - sbi->fsid = ctx->fsid;
> if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid)
> return get_tree_nodev(fc, erofs_fc_fill_super);
>
> @@ -720,19 +704,19 @@ static int erofs_fc_reconfigure(struct fs_context *fc)
> {
> struct super_block *sb = fc->root->d_sb;
> struct erofs_sb_info *sbi = EROFS_SB(sb);
> - struct erofs_fs_context *ctx = fc->fs_private;
> + struct erofs_sb_info *new_sbi = fc->s_fs_info;
>
> DBG_BUGON(!sb_rdonly(sb));
>
> - if (ctx->fsid || ctx->domain_id)
> + if (new_sbi->fsid || new_sbi->domain_id)
> erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
>
> - if (test_opt(&ctx->opt, POSIX_ACL))
> + if (test_opt(&new_sbi->opt, POSIX_ACL))
> fc->sb_flags |= SB_POSIXACL;
> else
> fc->sb_flags &= ~SB_POSIXACL;
>
> - sbi->opt = ctx->opt;
> + sbi->opt = new_sbi->opt;
>
> fc->sb_flags |= SB_RDONLY;
> return 0;
> @@ -763,16 +747,12 @@ static void erofs_free_dev_context(struct erofs_dev_context *devs)
>
> static void erofs_fc_free(struct fs_context *fc)
> {
> - struct erofs_fs_context *ctx = fc->fs_private;
> struct erofs_sb_info *sbi = fc->s_fs_info;
>
> - erofs_free_dev_context(ctx->devs);
> - kfree(ctx->fsid);
> - kfree(ctx->domain_id);
> - kfree(ctx);
> -
> - if (sbi)
> - kfree(sbi);
> + erofs_free_dev_context(sbi->devs);
> + kfree(sbi->fsid);
> + kfree(sbi->domain_id);
> + kfree(sbi);
> }
>
> static const struct fs_context_operations erofs_context_ops = {
> @@ -784,22 +764,22 @@ static const struct fs_context_operations erofs_context_ops = {
>
> static int erofs_init_fs_context(struct fs_context *fc)
> {
> - struct erofs_fs_context *ctx;
> + struct erofs_sb_info *sbi;
>
> - ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> - if (!ctx)
> + sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
> + if (!sbi)
> return -ENOMEM;
>
> - ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
> - if (!ctx->devs) {
> - kfree(ctx);
> + sbi->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
> + if (!sbi->devs) {
> + kfree(sbi);
> return -ENOMEM;
> }
> - fc->fs_private = ctx;
> + fc->fs_private = sbi;

I don't understand how your patch is going to work. fs_private isn't
transfered by the generic code to sb->s_fs_info. Did you mean
fc->s_fs_info = sbi?

>
> - idr_init(&ctx->devs->tree);
> - init_rwsem(&ctx->devs->rwsem);
> - erofs_default_options(ctx);
> + idr_init(&sbi->devs->tree);
> + init_rwsem(&sbi->devs->rwsem);
> + erofs_default_options(sbi);
> fc->ops = &erofs_context_ops;
> return 0;
> }
> --
> 2.31.1
>

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