doc: add text about possibly verify errors with norandommap

[fio.git] / cgroup.c

diff --git a/cgroup.c b/cgroup.c
index 14bbc57bd0862a46cac3ea0fbd9162288c77341f..629047b495b33c145ca545ac4856efdecaf78df5 100644 (file)
--- a/cgroup.c
+++ b/cgroup.c
@@ -4,22 +4,25 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <mntent.h>
+#include <sys/stat.h>
 #include "fio.h"
 #include "flist.h"
 #include "cgroup.h"
 #include "smalloc.h"
 
-static struct fio_mutex *lock;
+static struct fio_sem *lock;
 
 struct cgroup_member {
        struct flist_head list;
        char *root;
+       unsigned int cgroup_nodelete;
 };
 
 static char *find_cgroup_mnt(struct thread_data *td)
 {
        char *mntpoint = NULL;
-       struct mntent *mnt;
+       struct mntent *mnt, dummy;
+       char buf[256] = {0};
        FILE *f;
 
        f = setmntent("/proc/mounts", "r");
@@ -28,7 +31,7 @@ static char *find_cgroup_mnt(struct thread_data *td)
                return NULL;
        }
 
-       while ((mnt = getmntent(f)) != NULL) {
+       while ((mnt = getmntent_r(f, &dummy, buf, sizeof(buf))) != NULL) {
                if (!strcmp(mnt->mnt_type, "cgroup") &&
                    strstr(mnt->mnt_opts, "blkio"))
                        break;
@@ -43,17 +46,32 @@ static char *find_cgroup_mnt(struct thread_data *td)
        return mntpoint;
 }
 
-static void add_cgroup(const char *name, struct flist_head *clist)
+static void add_cgroup(struct thread_data *td, const char *name,
+                       struct flist_head *clist)
 {
        struct cgroup_member *cm;
 
+       if (!lock)
+               return;
+
        cm = smalloc(sizeof(*cm));
+       if (!cm) {
+err:
+               log_err("fio: failed to allocate cgroup member\n");
+               return;
+       }
+
        INIT_FLIST_HEAD(&cm->list);
        cm->root = smalloc_strdup(name);
-
-       fio_mutex_down(lock);
+       if (!cm->root) {
+               sfree(cm);
+               goto err;
+       }
+       if (td->o.cgroup_nodelete)
+               cm->cgroup_nodelete = 1;
+       fio_sem_down(lock);
        flist_add_tail(&cm->list, clist);
-       fio_mutex_up(lock);
+       fio_sem_up(lock);
 }
 
 void cgroup_kill(struct flist_head *clist)
@@ -61,17 +79,21 @@ void cgroup_kill(struct flist_head *clist)
        struct flist_head *n, *tmp;
        struct cgroup_member *cm;
 
-       fio_mutex_down(lock);
+       if (!lock)
+               return;
+
+       fio_sem_down(lock);
 
        flist_for_each_safe(n, tmp, clist) {
                cm = flist_entry(n, struct cgroup_member, list);
-               rmdir(cm->root);
+               if (!cm->cgroup_nodelete)
+                       rmdir(cm->root);
                flist_del(&cm->list);
                sfree(cm->root);
                sfree(cm);
        }
 
-       fio_mutex_up(lock);
+       fio_sem_up(lock);
 }
 
 static char *get_cgroup_root(struct thread_data *td, char *mnt)
@@ -92,7 +114,7 @@ static int write_int_to_file(struct thread_data *td, const char *path,
 {
        char tmp[256];
        FILE *f;
-       
+
        sprintf(tmp, "%s/%s", path, filename);
        f = fopen(tmp, "w");
        if (!f) {
@@ -125,6 +147,9 @@ int cgroup_setup(struct thread_data *td, struct flist_head *clist, char **mnt)
 {
        char *root;
 
+       if (!clist)
+               return 1;
+
        if (!*mnt) {
                *mnt = find_cgroup_mnt(td);
                if (!*mnt)
@@ -144,7 +169,7 @@ int cgroup_setup(struct thread_data *td, struct flist_head *clist, char **mnt)
                        goto err;
                }
        } else
-               add_cgroup(root, clist);
+               add_cgroup(td, root, clist);
 
        if (td->o.cgroup_weight) {
                if (write_int_to_file(td, root, "blkio.weight",
@@ -175,10 +200,12 @@ void cgroup_shutdown(struct thread_data *td, char **mnt)
 
 static void fio_init cgroup_init(void)
 {
-       lock = fio_mutex_init(1);
+       lock = fio_sem_init(FIO_SEM_UNLOCKED);
+       if (!lock)
+               log_err("fio: failed to allocate cgroup lock\n");
 }
 
 static void fio_exit cgroup_exit(void)
 {
-       fio_mutex_remove(lock);
+       fio_sem_remove(lock);
 }