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Date: Tue, 23 Jul 2013 00:06:58 +0800
From: Peng Tao <bergwolf@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org,
"John L. Hammond" <john.hammond@...el.com>,
Peng Tao <tao.peng@....com>,
Andreas Dilger <andreas.dilger@...el.com>
Subject: [PATCH 37/48] staging/lustre/procfs: return -ENOMEM from lprocfs_register()
From: "John L. Hammond" <john.hammond@...el.com>
In lprocfs_register(), if proc_mkdir() fails then return
ERR_PTR(-ENOMEM) rather than NULL and hold _lprocfs_mutex for the
whole function. In lprocfs_remove_nolock() return early if the entry
is an error pointer. Improve error handling around lprocfs_register()
in a few spots.
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2650
Lustre-change: http://review.whamcloud.com/5161
Signed-off-by: John L. Hammond <john.hammond@...el.com>
Reviewed-by: Emoly Liu <emoly.liu@...el.com>
Reviewed-by: Keith Mannthey <keith.mannthey@...el.com>
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
Signed-off-by: Peng Tao <tao.peng@....com>
Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
---
drivers/staging/lustre/lustre/ldlm/ldlm_pool.c | 1 +
drivers/staging/lustre/lustre/llite/super25.c | 2 +-
drivers/staging/lustre/lustre/lov/lov_obd.c | 6 ++---
.../lustre/lustre/obdclass/linux/linux-module.c | 9 ++++++-
.../lustre/lustre/obdclass/lprocfs_status.c | 28 ++++++++++++--------
.../staging/lustre/lustre/ptlrpc/gss/lproc_gss.c | 6 +++--
6 files changed, 34 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
index 3277a0d..101af4b 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
@@ -750,6 +750,7 @@ static int ldlm_pool_proc_init(struct ldlm_pool *pl)
if (IS_ERR(pl->pl_proc_dir)) {
CERROR("LProcFS failed in ldlm-pool-init\n");
rc = PTR_ERR(pl->pl_proc_dir);
+ pl->pl_proc_dir = NULL;
GOTO(out_free_name, rc);
}
diff --git a/drivers/staging/lustre/lustre/llite/super25.c b/drivers/staging/lustre/lustre/llite/super25.c
index 82c14a9..ea06f1a 100644
--- a/drivers/staging/lustre/lustre/llite/super25.c
+++ b/drivers/staging/lustre/lustre/llite/super25.c
@@ -214,7 +214,7 @@ static void __exit exit_lustre_lite(void)
ll_remote_perm_cachep = NULL;
kmem_cache_destroy(ll_file_data_slab);
- if (proc_lustre_fs_root)
+ if (proc_lustre_fs_root && !IS_ERR(proc_lustre_fs_root))
lprocfs_remove(&proc_lustre_fs_root);
}
diff --git a/drivers/staging/lustre/lustre/lov/lov_obd.c b/drivers/staging/lustre/lustre/lov/lov_obd.c
index 0a9e40d..c7c1a8c 100644
--- a/drivers/staging/lustre/lustre/lov/lov_obd.c
+++ b/drivers/staging/lustre/lustre/lov/lov_obd.c
@@ -836,11 +836,11 @@ int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
lprocfs_obd_setup(obd, lvars.obd_vars);
#ifdef LPROCFS
{
- int rc;
+ int rc1;
- rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
+ rc1 = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
0444, &lov_proc_target_fops, obd);
- if (rc)
+ if (rc1)
CWARN("Error adding the target_obd file\n");
}
#endif
diff --git a/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c b/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
index d2c3072..2abacf2 100644
--- a/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
+++ b/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
@@ -385,14 +385,21 @@ struct file_operations obd_device_list_fops = {
int class_procfs_init(void)
{
- int rc;
+ int rc = 0;
ENTRY;
obd_sysctl_init();
proc_lustre_root = lprocfs_register("fs/lustre", NULL,
lprocfs_base, NULL);
+ if (IS_ERR(proc_lustre_root)) {
+ rc = PTR_ERR(proc_lustre_root);
+ proc_lustre_root = NULL;
+ goto out;
+ }
+
rc = lprocfs_seq_create(proc_lustre_root, "devices", 0444,
&obd_device_list_fops, NULL);
+out:
if (rc)
CERROR("error adding /proc/fs/lustre/devices file\n");
RETURN(0);
diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
index 85163f4..e57a922 100644
--- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
+++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
@@ -179,17 +179,21 @@ struct proc_dir_entry *lprocfs_register(const char *name,
struct proc_dir_entry *parent,
struct lprocfs_vars *list, void *data)
{
- struct proc_dir_entry *newchild;
-
- newchild = proc_mkdir(name, parent);
- if (newchild != NULL && list != NULL) {
- int rc = lprocfs_add_vars(newchild, list, data);
- if (rc) {
- lprocfs_remove(&newchild);
- return ERR_PTR(rc);
+ struct proc_dir_entry *entry;
+
+ entry = proc_mkdir(name, parent);
+ if (entry == NULL)
+ GOTO(out, entry = ERR_PTR(-ENOMEM));
+
+ if (list != NULL) {
+ int rc = lprocfs_add_vars(entry, list, data);
+ if (rc != 0) {
+ lprocfs_remove(&entry);
+ entry = ERR_PTR(rc);
}
}
- return newchild;
+out:
+ return entry;
}
EXPORT_SYMBOL(lprocfs_register);
@@ -1596,10 +1600,12 @@ int lprocfs_exp_setup(struct obd_export *exp, lnet_nid_t *nid, int *newnid)
NULL, NULL);
OBD_FREE(buffer, LNET_NIDSTR_SIZE);
- if (new_stat->nid_proc == NULL) {
+ if (IS_ERR(new_stat->nid_proc)) {
CERROR("Error making export directory for nid %s\n",
libcfs_nid2str(*nid));
- GOTO(destroy_new_ns, rc = -ENOMEM);
+ rc = PTR_ERR(new_stat->nid_proc);
+ new_stat->nid_proc = NULL;
+ GOTO(destroy_new_ns, rc);
}
entry = lprocfs_add_simple(new_stat->nid_proc, "uuid",
diff --git a/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c b/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c
index 3404000..de100a1 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c
@@ -199,15 +199,17 @@ int gss_init_lproc(void)
gss_proc_root = lprocfs_register("gss", sptlrpc_proc_root,
gss_lprocfs_vars, NULL);
if (IS_ERR(gss_proc_root)) {
+ rc = PTR_ERR(gss_proc_root);
gss_proc_root = NULL;
- GOTO(err_out, rc = PTR_ERR(gss_proc_root));
+ GOTO(err_out, rc);
}
gss_proc_lk = lprocfs_register("lgss_keyring", gss_proc_root,
gss_lk_lprocfs_vars, NULL);
if (IS_ERR(gss_proc_lk)) {
+ rc = PTR_ERR(gss_proc_lk);
gss_proc_lk = NULL;
- GOTO(err_out, rc = PTR_ERR(gss_proc_root));
+ GOTO(err_out, rc);
}
return 0;
--
1.7.9.5
--
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