From: Jingbo Xu <jefflexu@linux.alibaba.com> mainline inclusion from mainline-v6.3-rc1 commit 61fef98945d0b2fea522ef958f57a783e2a072a9 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IB5UKT -------------------------------- Currently there're two anonymous inodes (inode and anon_inode in struct erofs_fscache) for each blob. The former was introduced as the address_space of page cache for bootstrap. The latter was initially introduced as both the address_space of page cache and also a sentinel in the shared domain. Since now the management of cookies in share domain has been decoupled with the anonymous inode, there's no need to maintain an extra anonymous inode. Let's unify these two anonymous inodes. Besides, in non-share-domain mode only bootstrap will allocate anonymous inode. To simplify the implementation, always allocate anonymous inode for both bootstrap and data blobs. Similarly release anonymous inodes for data blobs when .put_super() is called, or we'll get "VFS: Busy inodes after unmount." warning. Also remove the redundant set_nlink() when initializing the anonymous inode, since i_nlink has already been initialized to 1 when the inode gets allocated. Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: Jia Zhu <zhujia.zj@bytedance.com> Link: https://lore.kernel.org/r/20230209063913.46341-5-jefflexu@linux.alibaba.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Conflicts: fs/erofs/fscache.c fs/erofs/internal.h fs/erofs/super.c [ Because it hasn't switched to folio yet and doesn't have the volume introduced by the cachefile rewrite patch. ] Signed-off-by: Baokun Li <libaokun1@huawei.com> --- fs/erofs/fscache.c | 84 ++++++++++++++++++--------------------------- fs/erofs/internal.h | 7 ++-- fs/erofs/super.c | 2 ++ 3 files changed, 38 insertions(+), 55 deletions(-) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 23b55a67feb5..cfa000c6175b 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -375,13 +375,13 @@ static int erofs_fscache_register_domain(struct super_block *sb) return err; } -static -struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb, - char *name, - unsigned int flags) +static struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb, + char *name, unsigned int flags) { struct erofs_fscache *ctx; struct fscache_cookie *cookie; + struct super_block *isb; + struct inode *inode; int ret; ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); @@ -401,31 +401,31 @@ struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb, } //fscache_use_cookie(cookie, false); - ctx->cookie = cookie; - if (flags & EROFS_REG_COOKIE_NEED_INODE) { - struct inode *const inode = new_inode(sb); - - if (!inode) { - erofs_err(sb, "failed to get anon inode for %s", name); - ret = -ENOMEM; - goto err_cookie; - } - - set_nlink(inode, 1); - inode->i_size = OFFSET_MAX; - inode->i_mapping->a_ops = &erofs_fscache_meta_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); - inode->i_private = ctx; - - ctx->inode = inode; + /* + * Allocate anonymous inode in global pseudo mount for shareable blobs, + * so that they are accessible among erofs fs instances. + */ + isb = flags & EROFS_REG_COOKIE_SHARE ? erofs_pseudo_mnt->mnt_sb : sb; + inode = new_inode(isb); + if (!inode) { + erofs_err(sb, "failed to get anon inode for %s", name); + ret = -ENOMEM; + goto err_cookie; } + inode->i_size = OFFSET_MAX; + inode->i_mapping->a_ops = &erofs_fscache_meta_aops; + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); + inode->i_private = ctx; + + ctx->cookie = cookie; + ctx->inode = inode; return ctx; err_cookie: -// fscache_unuse_cookie(ctx->cookie, NULL, NULL); - fscache_relinquish_cookie(ctx->cookie, NULL, false); +// fscache_unuse_cookie(cookie, NULL, NULL); + fscache_relinquish_cookie(cookie, NULL, false); err: kfree(ctx); return ERR_PTR(ret); @@ -436,18 +436,13 @@ static void erofs_fscache_relinquish_cookie(struct erofs_fscache *ctx) //fscache_unuse_cookie(ctx->cookie, NULL, NULL); fscache_relinquish_cookie(ctx->cookie, NULL, false); iput(ctx->inode); - iput(ctx->anon_inode); kfree(ctx->name); kfree(ctx); } -static -struct erofs_fscache *erofs_fscache_domain_init_cookie(struct super_block *sb, - char *name, - unsigned int flags) +static struct erofs_fscache *erofs_domain_init_cookie(struct super_block *sb, + char *name, unsigned int flags) { - int err; - struct inode *inode; struct erofs_fscache *ctx; struct erofs_domain *domain = EROFS_SB(sb)->domain; @@ -457,35 +452,23 @@ struct erofs_fscache *erofs_fscache_domain_init_cookie(struct super_block *sb, 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; + erofs_fscache_relinquish_cookie(ctx); + return ERR_PTR(-ENOMEM); } + refcount_inc(&domain->ref); ctx->domain = domain; - ctx->anon_inode = inode; list_add(&ctx->node, &erofs_domain_cookies_list); - 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, - unsigned int flags) +static struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb, + char *name, unsigned int flags) { struct erofs_fscache *ctx; struct erofs_domain *domain = EROFS_SB(sb)->domain; + flags |= EROFS_REG_COOKIE_SHARE; mutex_lock(&erofs_domain_cookies_lock); list_for_each_entry(ctx, &erofs_domain_cookies_list, node) { if (ctx->domain != domain || strcmp(ctx->name, name)) @@ -500,7 +483,7 @@ struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb, mutex_unlock(&erofs_domain_cookies_lock); return ctx; } - ctx = erofs_fscache_domain_init_cookie(sb, name, flags); + ctx = erofs_domain_init_cookie(sb, name, flags); mutex_unlock(&erofs_domain_cookies_lock); return ctx; } @@ -539,7 +522,7 @@ int erofs_fscache_register_fs(struct super_block *sb) int ret; struct erofs_sb_info *sbi = EROFS_SB(sb); struct erofs_fscache *fscache; - unsigned int flags; + unsigned int flags = 0; if (sbi->domain_id) ret = erofs_fscache_register_domain(sb); @@ -558,7 +541,6 @@ int erofs_fscache_register_fs(struct super_block *sb) * * Acquired domain/volume will be relinquished in kill_sb() on error. */ - flags = EROFS_REG_COOKIE_NEED_INODE; if (sbi->domain_id) flags |= EROFS_REG_COOKIE_NEED_NOEXIST; fscache = erofs_fscache_register_cookie(sb, sbi->fsid, flags); diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index f961256bd469..283ae94abbf4 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -91,8 +91,7 @@ struct erofs_domain { struct erofs_fscache { struct fscache_cookie *cookie; - struct inode *inode; - struct inode *anon_inode; + struct inode *inode; /* anonymous inode for the blob */ /* used for share domain mode */ struct erofs_domain *domain; @@ -496,8 +495,8 @@ static inline void z_erofs_exit_zip_subsystem(void) {} #endif /* !CONFIG_EROFS_FS_ZIP */ /* flags for erofs_fscache_register_cookie() */ -#define EROFS_REG_COOKIE_NEED_INODE 1 -#define EROFS_REG_COOKIE_NEED_NOEXIST 2 +#define EROFS_REG_COOKIE_SHARE 0x0001 +#define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002 /* fscache.c */ #ifdef CONFIG_EROFS_FS_ONDEMAND diff --git a/fs/erofs/super.c b/fs/erofs/super.c index eb9f7b71ec14..8ed69d0fcce0 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -717,6 +717,8 @@ static void erofs_put_super(struct super_block *sb) iput(sbi->managed_cache); sbi->managed_cache = NULL; #endif + erofs_free_dev_context(sbi->devs); + sbi->devs = NULL; erofs_fscache_unregister_cookie(sbi->s_fscache); sbi->s_fscache = NULL; } -- 2.46.1