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Thu, 01 May 2025 12:43:12 -0700 (PDT) Received: from system76-pc.attlocal.net ([2600:1700:6476:1430:7a9:d9dd:47b7:3886]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74058dc45basm50882b3a.69.2025.05.01.12.43.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 May 2025 12:43:11 -0700 (PDT) From: Viacheslav Dubeyko To: ceph-devel@vger.kernel.org Cc: idryomov@gmail.com, linux-fsdevel@vger.kernel.org, pdonnell@redhat.com, amarkuze@redhat.com, Slava.Dubeyko@ibm.com, slava@dubeyko.com Subject: [RFC PATCH 2/2] ceph: exchange BUG_ON on WARN_ON in ceph_readdir() Date: Thu, 1 May 2025 12:42:48 -0700 Message-ID: <20250501194248.660959-3-slava@dubeyko.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250501194248.660959-1-slava@dubeyko.com> References: <20250501194248.660959-1-slava@dubeyko.com> Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Viacheslav Dubeyko This patch leaves BUG_ON() for debug case and introduces WARN_ON() for release case in ceph_readdir() logic. If dfi->readdir_cache_idx somehow is invalid, then we will have BUG_ON() in debug build but release build will issue WARN_ON() instead. Signed-off-by: Viacheslav Dubeyko --- fs/ceph/Kconfig | 13 +++++++++++++ fs/ceph/dir.c | 21 ++++++++++++++++++--- 2 files changed, 31 insertions(+), 3 deletions(-) diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig index 3e7def3d31c1..dba85d202a14 100644 --- a/fs/ceph/Kconfig +++ b/fs/ceph/Kconfig @@ -50,3 +50,16 @@ config CEPH_FS_SECURITY_LABEL If you are not using a security module that requires using extended attributes for file security labels, say N. + +config CEPH_FS_DEBUG + bool "Ceph client debugging" + depends on CEPH_FS + default n + help + If you say Y here, this option enables additional pre-condition + and post-condition checks in functions. Also it could enable + BUG_ON() instead of returning the error code. This option could + save more messages in system log and execute additional computation. + + If you are going to debug the code, then chose Y here. + If unsure, say N. diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index acecc16f2b99..c88326e2ddbf 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -614,13 +614,28 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) spin_lock(&ci->i_ceph_lock); if (dfi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) { + bool is_invalid; + size_t size; + doutc(cl, " marking %p %llx.%llx complete and ordered\n", inode, ceph_vinop(inode)); /* use i_size to track number of entries in * readdir cache */ - BUG_ON(dfi->readdir_cache_idx < 0); - i_size_write(inode, dfi->readdir_cache_idx * - sizeof(struct dentry*)); + + is_invalid = + is_cache_idx_invalid(dfi->readdir_cache_idx); + +#ifdef CONFIG_CEPH_FS_DEBUG + BUG_ON(is_invalid); +#else + WARN_ON(is_invalid); +#endif /* CONFIG_CEPH_FS_DEBUG */ + + if (!is_invalid) { + size = dfi->readdir_cache_idx; + size *= sizeof(struct dentry*); + i_size_write(inode, size); + } } else { doutc(cl, " marking %llx.%llx complete\n", ceph_vinop(inode));