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[50.36.89.147]) by smtp.gmail.com with ESMTPSA id x197-v6sm2147205itb.5.2018.07.31.12.54.35 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 31 Jul 2018 12:54:35 -0700 (PDT) From: Trond Myklebust X-Google-Original-From: Trond Myklebust To: Anna Schumaker Cc: linux-nfs@vger.kernel.org Subject: [PATCH v3 1/3] NFSv4: bump/drop the nlink count on the parent dir when we mkdir/rmdir Date: Tue, 31 Jul 2018 15:54:10 -0400 Message-Id: <20180731195412.10912-2-trond.myklebust@hammerspace.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180731195412.10912-1-trond.myklebust@hammerspace.com> References: <20180731195412.10912-1-trond.myklebust@hammerspace.com> MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Ensure that we always bump or drop the nlink count on the parent directory when we do a mkdir or a rmdir(). This needs to be done by hand as we don't have pre/post op attributes. Signed-off-by: Trond Myklebust --- fs/nfs/nfs4proc.c | 50 +++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 42 insertions(+), 8 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 5a8190ec31a2..1a8423ff7606 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1071,12 +1071,26 @@ int nfs4_call_sync(struct rpc_clnt *clnt, return nfs4_call_sync_sequence(clnt, server, msg, args, res); } -static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, +static void +nfs4_inc_nlink_locked(struct inode *inode) +{ + NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER; + inc_nlink(inode); +} + +static void +nfs4_dec_nlink_locked(struct inode *inode) +{ + NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER; + drop_nlink(inode); +} + +static void +update_changeattr_locked(struct inode *dir, struct nfs4_change_info *cinfo, unsigned long timestamp) { struct nfs_inode *nfsi = NFS_I(dir); - spin_lock(&dir->i_lock); nfsi->cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME | NFS_INO_INVALID_DATA; @@ -1093,6 +1107,14 @@ static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, nfsi->read_cache_jiffies = timestamp; nfsi->attr_gencount = nfs_inc_attr_generation_counter(); nfs_fscache_invalidate(dir); +} + +static void +update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, + unsigned long timestamp) +{ + spin_lock(&dir->i_lock); + update_changeattr_locked(dir, cinfo, timestamp); spin_unlock(&dir->i_lock); } @@ -4237,7 +4259,8 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, return status; } -static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) +static int +_nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) { struct nfs_server *server = NFS_SERVER(dir); struct nfs_removeargs args = { @@ -4256,8 +4279,14 @@ static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name) int status; status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); - if (status == 0) - update_changeattr(dir, &res.cinfo, timestamp); + if (status == 0) { + spin_lock(&dir->i_lock); + update_changeattr_locked(dir, &res.cinfo, timestamp); + /* Removing a directory decrements nlink in the parent */ + if (ftype == NF4DIR && dir->i_nlink > 2) + nfs4_dec_nlink_locked(dir); + spin_unlock(&dir->i_lock); + } return status; } @@ -4274,7 +4303,7 @@ static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) nfs4_inode_make_writeable(inode); } do { - err = _nfs4_proc_remove(dir, &dentry->d_name); + err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); trace_nfs4_remove(dir, &dentry->d_name, err); err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); @@ -4288,7 +4317,7 @@ static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) int err; do { - err = _nfs4_proc_remove(dir, name); + err = _nfs4_proc_remove(dir, name, NF4DIR); trace_nfs4_remove(dir, name, err); err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); @@ -4492,8 +4521,13 @@ static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_ int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, &data->arg.seq_args, &data->res.seq_res, 1); if (status == 0) { - update_changeattr(dir, &data->res.dir_cinfo, + spin_lock(&dir->i_lock); + update_changeattr_locked(dir, &data->res.dir_cinfo, data->res.fattr->time_start); + /* Creating a directory bumps nlink in the parent */ + if (data->arg.ftype == NF4DIR) + nfs4_inc_nlink_locked(dir); + spin_unlock(&dir->i_lock); status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label); } return status;