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Date: Sun, 20 Aug 2017 20:40:37 +0200
From: SF Markus Elfring <elfring@...rs.sourceforge.net>
To: ceph-devel@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
Sage Weil <sage@...hat.com>, "Yan, Zheng" <zyan@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
kernel-janitors@...r.kernel.org
Subject: [PATCH 3/3] ceph: Adjust 36 checks for null pointers
From: Markus Elfring <elfring@...rs.sourceforge.net>
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 <elfring@...rs.sourceforge.net>
---
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
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