Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753442AbdHTSks (ORCPT ); Sun, 20 Aug 2017 14:40:48 -0400 Received: from mout.web.de ([212.227.17.12]:61318 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753313AbdHTSkp (ORCPT ); Sun, 20 Aug 2017 14:40:45 -0400 Subject: [PATCH 3/3] ceph: Adjust 36 checks for null pointers From: SF Markus Elfring To: ceph-devel@vger.kernel.org, Ilya Dryomov , Sage Weil , "Yan, Zheng" Cc: LKML , kernel-janitors@vger.kernel.org References: Message-ID: Date: Sun, 20 Aug 2017 20:40:37 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K0:SaQw/a+jChp9MjyB/omVDvWtHOeTi3Pq2RIch+/KPaEJg1O+suD qBqgQvXRWT7RAnSRBt0g5Rzeh40FdIImOaEWMU98AqyMXLjo2fcq7FlbuNSt0d5xBREkYF1 XeAEwEW3DPpfS+7PvAmaphQe1H/fBqzQdjr67U7E1pWavG65cXGlKo6Ol0HcMyNONAFges+ q8jsW5WOIKKTw8bHrBxLQ== X-UI-Out-Filterresults: notjunk:1;V01:K0:G6l1j0h1JcM=:cutb/rd2XsdamSM99yRj62 GDDGsXJXzVVtTfzszNRl6LLbjwPbfEv9XjDJwbxCzqUgwNLbyp0+Q9HWM0BMJ1t9n3YkbcWHD 5pWpyKGabFewSV4LeZcHci8HPMvlil5B2JnSk0yoVEG+3Om4T6ROv3PRwIDTm2mrc4tSPhBe+ auuooPdkYf9vVNRIlZwZEHA594RnoydUmx1jX2o79apq8qW/UdhoAGU7aX7Sifj0Xd8xNlIUa /vztn6aU5vV9U+crWZqeXzpSWM4wUh1CTrSaIf6WhTunDW4Gy7NnRkNJNGbmyMBLwflbHw9J1 d+3Xnwnoe4I8vYhpqc9olKWZXxPtMUF3OsUve5USGAaaW799BVg370/XWswdwuIstFiZQ2ydP lN8nqM/dMwRXKY0Z6YQn6gWoHjVZlSdgF0sVPIq20v1WegVKtqht8T3sqYSaIbFpleldbQt5w 22Ct2U4mT5P0HmazFE7b56s+dFDW17Nn8F2YeNzoFqpz8fbgTurzEnAeuaRIF3YcOD7cxshZe WHXbEc1JzUwdp/jNe38CyzR0iXcBZTxYPYwnwk42v9sK+xCOmTD0JVgJHy0xrOR9g9HdXZn35 kktamKSL2vRH6+WidVkaCeby+DNHqwl0LOhzjcABTPX1NCqLIPzl+PmpQ50zmuuNK72WwsF2U 1AFLvF072pxdfZT/kYhe811hAN+gsWM2yu5HXYCPUr6dqp9AbK3GS7GP/Bu5Q5mg03fYCI6rO iyqzRTOsaHgpPyG3KomsKqwyzaao8gIJoC+90QeCP1c0Fy25kob20ZgpG81Z8WwDPmcJ75I2v slFnCliDkn4HKgzlj8Jg1ZpQBrwL989LvtUMvH9LEkdiDudeiE= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12506 Lines: 369 From: Markus Elfring Date: Sun, 20 Aug 2017 20:22:02 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The script “checkpatch.pl” pointed information out like the following. Comparison to NULL could be written … Thus fix the affected source code places. Signed-off-by: Markus Elfring --- fs/ceph/addr.c | 2 +- fs/ceph/cache.c | 2 +- fs/ceph/caps.c | 4 ++-- fs/ceph/debugfs.c | 2 +- fs/ceph/file.c | 2 +- fs/ceph/inode.c | 6 +++--- fs/ceph/mds_client.c | 22 +++++++++++----------- fs/ceph/mdsmap.c | 6 +++--- fs/ceph/super.c | 18 +++++++++--------- fs/ceph/xattr.c | 8 ++++---- 10 files changed, 36 insertions(+), 36 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 50836280a6f8..981589dbb871 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -541,7 +541,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) /* verify this is a writeable snap context */ snapc = page_snap_context(page); - if (snapc == NULL) { + if (!snapc) { dout("writepage %p page %p not dirty?\n", inode, page); return 0; } diff --git a/fs/ceph/cache.c b/fs/ceph/cache.c index 6d3baf61b4d5..a2c849841c48 100644 --- a/fs/ceph/cache.c +++ b/fs/ceph/cache.c @@ -209,7 +209,7 @@ void ceph_fscache_register_inode_cookie(struct inode *inode) struct ceph_fs_client *fsc = ceph_inode_to_client(inode); /* No caching for filesystem */ - if (fsc->fscache == NULL) + if (!fsc->fscache) return; /* Only cache for regular files that are read only */ diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 7007ae2a5ad2..ea12f689f15a 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -611,7 +611,7 @@ void ceph_add_cap(struct inode *inode, } if (flags & CEPH_CAP_FLAG_AUTH) { - if (ci->i_auth_cap == NULL || + if (!ci->i_auth_cap || ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) { ci->i_auth_cap = cap; cap->mds_wanted = wanted; @@ -728,7 +728,7 @@ static void __touch_cap(struct ceph_cap *cap) struct ceph_mds_session *s = cap->session; spin_lock(&s->s_cap_lock); - if (s->s_cap_iterator == NULL) { + if (!s->s_cap_iterator) { dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, s->s_mds); list_move_tail(&cap->session_caps, &s->s_caps); diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index 4e2d112c982f..d635496ea189 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -24,7 +24,7 @@ static int mdsmap_show(struct seq_file *s, void *p) struct ceph_fs_client *fsc = s->private; struct ceph_mdsmap *mdsmap; - if (fsc->mdsc == NULL || fsc->mdsc->mdsmap == NULL) + if (!fsc->mdsc || !fsc->mdsc->mdsmap) return 0; mdsmap = fsc->mdsc->mdsmap; seq_printf(s, "epoch %d\n", mdsmap->m_epoch); diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 3d48c415f3cb..aeb5445f4c1c 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -175,7 +175,7 @@ static int ceph_init_file(struct inode *inode, struct file *file, int fmode) dout("init_file %p %p 0%o (regular)\n", inode, file, inode->i_mode); cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL); - if (cf == NULL) { + if (!cf) { ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ return -ENOMEM; } diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 8eae56b2d1d6..49c4e5deac5f 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -52,7 +52,7 @@ struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) ino_t t = ceph_vino_to_ino(vino); inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); - if (inode == NULL) + if (!inode) return ERR_PTR(-ENOMEM); if (inode->i_state & I_NEW) { dout("get_inode created new inode %p %llx.%llx ino %llx\n", @@ -1173,7 +1173,7 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req) dn = d_alloc(parent, &dname); dout("d_alloc %p '%.*s' = %p\n", parent, dname.len, dname.name, dn); - if (dn == NULL) { + if (!dn) { dput(parent); err = -ENOMEM; goto done; @@ -1562,7 +1562,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, dn = d_alloc(parent, &dname); dout("d_alloc %p '%.*s' = %p\n", parent, dname.len, dname.name, dn); - if (dn == NULL) { + if (!dn) { dout("d_alloc badness\n"); err = -ENOMEM; goto out; diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 666a9f274832..bcfbaf341e89 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -408,7 +408,7 @@ struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, { struct ceph_mds_session *session; - if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) + if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) return NULL; session = mdsc->sessions[mds]; dout("lookup_mds_session %p %d\n", session, @@ -483,7 +483,7 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, dout("register_session realloc to %d\n", newmax); sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); - if (sa == NULL) + if (!sa) goto fail_realloc; if (mdsc->sessions) { memcpy(sa, mdsc->sessions, @@ -886,7 +886,7 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6 /* Calculate serialized length of metadata */ metadata_bytes = 4; /* map length */ - for (i = 0; metadata[i][0] != NULL; ++i) { + for (i = 0; metadata[i][0]; ++i) { metadata_bytes += 8 + strlen(metadata[i][0]) + strlen(metadata[i][1]); metadata_key_count++; @@ -919,7 +919,7 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6 ceph_encode_32(&p, metadata_key_count); /* Two length-prefixed strings for each entry in the map */ - for (i = 0; metadata[i][0] != NULL; ++i) { + for (i = 0; metadata[i][0]; ++i) { size_t const key_len = strlen(metadata[i][0]); size_t const val_len = strlen(metadata[i][1]); @@ -1122,7 +1122,7 @@ static int iterate_session_caps(struct ceph_mds_session *session, spin_lock(&session->s_cap_lock); p = p->next; - if (cap->ci == NULL) { + if (!cap->ci) { dout("iterate_session_caps finishing cap %p removal\n", cap); BUG_ON(cap->session != session); @@ -1748,7 +1748,7 @@ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, int len, pos; unsigned seq; - if (dentry == NULL) + if (!dentry) return ERR_PTR(-EINVAL); retry: @@ -1771,7 +1771,7 @@ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, len--; /* no leading '/' */ path = kmalloc(len+1, GFP_NOFS); - if (path == NULL) + if (!path) return ERR_PTR(-ENOMEM); pos = len; path[pos] = 0; /* trailing null */ @@ -3133,7 +3133,7 @@ static void check_new_map(struct ceph_mds_client *mdsc, newmap->m_epoch, oldmap->m_epoch); for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) { - if (mdsc->sessions[i] == NULL) + if (!mdsc->sessions[i]) continue; s = mdsc->sessions[i]; oldstate = ceph_mdsmap_get_state(oldmap, i); @@ -3280,7 +3280,7 @@ static void handle_lease(struct ceph_mds_client *mdsc, mutex_lock(&session->s_mutex); session->s_seq++; - if (inode == NULL) { + if (!inode) { dout("handle_lease no inode %llx\n", vino.ino); goto release; } @@ -3438,7 +3438,7 @@ static void delayed_work(struct work_struct *work) for (i = 0; i < mdsc->max_sessions; i++) { struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); - if (s == NULL) + if (!s) continue; if (s->s_state == CEPH_MDS_SESSION_CLOSING) { dout("resending session close request for mds%d\n", @@ -3490,7 +3490,7 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc) fsc->mdsc = mdsc; mutex_init(&mdsc->mutex); mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); - if (mdsc->mdsmap == NULL) { + if (!mdsc->mdsmap) { kfree(mdsc); return -ENOMEM; } diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c index 1a748cf88535..33ced4c22732 100644 --- a/fs/ceph/mdsmap.c +++ b/fs/ceph/mdsmap.c @@ -112,7 +112,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) u16 mdsmap_ev; m = kzalloc(sizeof(*m), GFP_NOFS); - if (m == NULL) + if (!m) return ERR_PTR(-ENOMEM); ceph_decode_need(p, end, 1 + 1, bad); @@ -138,7 +138,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) m->m_num_mds = m->m_max_mds; m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS); - if (m->m_info == NULL) + if (!m->m_info) goto nomem; /* pick out active nodes from mds_info (state > 0) */ @@ -232,7 +232,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) if (num_export_targets) { info->export_targets = kcalloc(num_export_targets, sizeof(u32), GFP_NOFS); - if (info->export_targets == NULL) + if (!info->export_targets) goto nomem; for (j = 0; j < num_export_targets; j++) info->export_targets[j] = diff --git a/fs/ceph/super.c b/fs/ceph/super.c index aa06a8c24792..96acae76fbad 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -576,7 +576,7 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, } fsc->client->extra_mon_dispatch = extra_mon_dispatch; - if (fsopt->mds_namespace == NULL) { + if (!fsopt->mds_namespace) { ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 0, true); } else { @@ -597,13 +597,13 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, * to be processed in parallel, limit concurrency. */ fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); - if (fsc->wb_wq == NULL) + if (!fsc->wb_wq) goto fail_client; fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); - if (fsc->pg_inv_wq == NULL) + if (!fsc->pg_inv_wq) goto fail_wb_wq; fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); - if (fsc->trunc_wq == NULL) + if (!fsc->trunc_wq) goto fail_pg_inv_wq; /* set up mempools */ @@ -674,26 +674,26 @@ static int __init init_caches(void) __alignof__(struct ceph_inode_info), SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| SLAB_ACCOUNT, ceph_inode_init_once); - if (ceph_inode_cachep == NULL) + if (!ceph_inode_cachep) return -ENOMEM; ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); - if (ceph_cap_cachep == NULL) + if (!ceph_cap_cachep) goto bad_cap; ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); - if (ceph_cap_flush_cachep == NULL) + if (!ceph_cap_flush_cachep) goto bad_cap_flush; ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); - if (ceph_dentry_cachep == NULL) + if (!ceph_dentry_cachep) goto bad_dentry; ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); - if (ceph_file_cachep == NULL) + if (!ceph_file_cachep) goto bad_file; if ((error = ceph_fscache_register())) diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index 11263f102e4c..3542b2c364cf 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -777,7 +777,7 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, spin_unlock(&ci->i_ceph_lock); /* security module gets xattr while filling trace */ - if (current->journal_info != NULL) { + if (current->journal_info) { pr_warn_ratelimited("sync getxattr %p " "during filling trace\n", inode); return -EBUSY; @@ -809,7 +809,7 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, memcpy(value, xattr->val, xattr->val_len); - if (current->journal_info != NULL && + if (current->journal_info && !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) ci->i_ceph_flags |= CEPH_I_SEC_INITED; out: @@ -1058,7 +1058,7 @@ int __ceph_setxattr(struct inode *inode, const char *name, up_read(&mdsc->snap_rwsem); /* security module set xattr while filling trace */ - if (current->journal_info != NULL) { + if (current->journal_info) { pr_warn_ratelimited("sync setxattr %p " "during filling trace\n", inode); err = -EBUSY; @@ -1108,7 +1108,7 @@ bool ceph_security_xattr_deadlock(struct inode *in) { struct ceph_inode_info *ci; bool ret; - if (in->i_security == NULL) + if (!in->i_security) return false; ci = ceph_inode(in); spin_lock(&ci->i_ceph_lock); -- 2.14.0