The patch titled
containersv10-basic-container-framework-fix
has been added to the -mm tree. Its filename is
containersv10-basic-container-framework-fix.patch
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------------------------------------------------------
Subject: containersv10-basic-container-framework-fix
From: Andrew Morton <[EMAIL PROTECTED]>
Cc: "Eric W. Biederman" <[EMAIL PROTECTED]>
Cc: "Serge E. Hallyn" <[EMAIL PROTECTED]>
Cc: Balbir Singh <[EMAIL PROTECTED]>
Cc: Dave Hansen <[EMAIL PROTECTED]>
Cc: Herbert Poetzl <[EMAIL PROTECTED]>
Cc: Kirill Korotaev <[EMAIL PROTECTED]>
Cc: Paul Jackson <[EMAIL PROTECTED]>
Cc: Paul Menage <[EMAIL PROTECTED]>
Cc: Srivatsa Vaddagiri <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
include/linux/container.h | 7 +--
include/linux/magic.h | 1
kernel/container.c | 83 +++++++++++++++++-------------------
3 files changed, 45 insertions(+), 46 deletions(-)
diff -puN include/linux/container.h~containersv10-basic-container-framework-fix
include/linux/container.h
--- a/include/linux/container.h~containersv10-basic-container-framework-fix
+++ a/include/linux/container.h
@@ -12,17 +12,19 @@
#include <linux/kref.h>
#include <linux/cpumask.h>
#include <linux/nodemask.h>
+#include <linux/rcupdate.h>
#ifdef CONFIG_CONTAINERS
+struct containerfs_root;
+struct inode;
+
extern int container_init_early(void);
extern int container_init(void);
extern void container_init_smp(void);
extern void container_lock(void);
extern void container_unlock(void);
-struct containerfs_root;
-
/* Per-subsystem/per-container state maintained by the system. */
struct container_subsys_state {
/* The container that this subsystem is attached to. Useful
@@ -94,7 +96,6 @@ struct container {
* - the 'cftype' of the file is file->f_dentry->d_fsdata
*/
-struct inode;
#define MAX_CFTYPE_NAME 64
struct cftype {
/* By convention, the name should begin with the name of the
diff -puN include/linux/magic.h~containersv10-basic-container-framework-fix
include/linux/magic.h
--- a/include/linux/magic.h~containersv10-basic-container-framework-fix
+++ a/include/linux/magic.h
@@ -41,5 +41,6 @@
#define SMB_SUPER_MAGIC 0x517B
#define USBDEVICE_SUPER_MAGIC 0x9fa2
+#define CONTAINER_SUPER_MAGIC 0x27e0eb
#endif /* __LINUX_MAGIC_H__ */
diff -puN kernel/container.c~containersv10-basic-container-framework-fix
kernel/container.c
--- a/kernel/container.c~containersv10-basic-container-framework-fix
+++ a/kernel/container.c
@@ -38,16 +38,19 @@
#include <linux/list.h>
#include <linux/mempolicy.h>
#include <linux/mm.h>
+#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/rcupdate.h>
+#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/security.h>
#include <linux/slab.h>
+#include <linux/magic.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
@@ -56,11 +59,7 @@
#include <linux/backing-dev.h>
#include <linux/sort.h>
-#include <asm/uaccess.h>
#include <asm/atomic.h>
-#include <linux/mutex.h>
-
-#define CONTAINER_SUPER_MAGIC 0x27e0eb
/* Generate an array of container subsystem pointers */
#define SUBSYS(_x) &_x ## _subsys,
@@ -110,12 +109,12 @@ static LIST_HEAD(roots);
* avoids us having to do extra work in the fork/exit path if none of the
* subsystems need to be called.
*/
-static int need_forkexit_callback = 0;
+static int need_forkexit_callback;
/* bits in struct container flags field */
-typedef enum {
+enum {
CONT_REMOVED,
-} container_flagbits_t;
+};
/* convenient tests for these bits */
inline int container_is_removed(const struct container *cont)
@@ -211,8 +210,9 @@ void container_unlock(void)
/*
* A couple of forward declarations required, due to cyclic reference loop:
- * container_mkdir -> container_create -> container_populate_dir ->
container_add_file
- * -> container_create_file -> container_dir_inode_operations ->
container_mkdir.
+ * container_mkdir -> container_create -> container_populate_dir ->
+ * container_add_file -> container_create_file ->
container_dir_inode_operations
+ * -> container_mkdir.
*/
static int container_mkdir(struct inode *dir, struct dentry *dentry, int mode);
@@ -220,14 +220,12 @@ static int container_rmdir(struct inode
static int container_populate_dir(struct container *cont);
static struct inode_operations container_dir_inode_operations;
-static struct backing_dev_info container_backing_dev_info = {
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
-};
-
static struct inode *container_new_inode(mode_t mode, struct super_block *sb)
{
struct inode *inode = new_inode(sb);
+ static struct backing_dev_info container_backing_dev_info = {
+ .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ };
if (inode) {
inode->i_mode = mode;
@@ -251,14 +249,14 @@ static void container_diput(struct dentr
iput(inode);
}
-static struct dentry_operations container_dops = {
- .d_iput = container_diput,
-};
-
static struct dentry *container_get_dentry(struct dentry *parent,
const char *name)
{
struct dentry *d = lookup_one_len(name, parent, strlen(name));
+ static struct dentry_operations container_dops = {
+ .d_iput = container_diput,
+ };
+
if (!IS_ERR(d))
d->d_op = &container_dops;
return d;
@@ -276,6 +274,7 @@ static void remove_dir(struct dentry *d)
static void container_clear_directory(struct dentry *dentry)
{
struct list_head *node;
+
BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
spin_lock(&dcache_lock);
node = dentry->d_subdirs.next;
@@ -334,11 +333,10 @@ static int rebind_subsystems(struct cont
/* Currently we don't handle adding/removing subsystems when
* any subcontainers exist. This is theoretically supportable
- * but involves complex erro r handling, so it's being left until
+ * but involves complex error handling, so it's being left until
* later */
- if (!list_empty(&cont->children)) {
+ if (!list_empty(&cont->children))
return -EBUSY;
- }
/* Process each subsystem */
for (i = 0; i < CONTAINER_SUBSYS_COUNT; i++) {
@@ -385,10 +383,8 @@ static int rebind_subsystems(struct cont
* there are active subcontainers since each subcontainer bumps the
* value of sb->s_active.
*/
-
static void container_put_super(struct super_block *sb)
{
-
struct containerfs_root *root = sb->s_fs_info;
struct container *cont = &root->top_container;
int ret;
@@ -416,9 +412,9 @@ static int container_show_options(struct
{
struct containerfs_root *root = vfs->mnt_sb->s_fs_info;
struct container_subsys *ss;
- for_each_subsys(root, ss) {
+
+ for_each_subsys(root, ss)
seq_printf(seq, ",%s", ss->name);
- }
return 0;
}
@@ -604,7 +600,6 @@ static int container_get_sb(struct file_
container_populate_dir(cont);
mutex_unlock(&cont->dentry->d_inode->i_mutex);
BUG_ON(ret);
-
} else {
/* Reuse the existing superblock */
ret = simple_set_mnt(mnt, root->sb);
@@ -634,10 +629,9 @@ static inline struct cftype *__d_cft(str
}
/*
- * Call with container_mutex held. Writes path of container into buf.
+ * Called with container_mutex held. Writes path of container into buf.
* Returns 0 on success, -errno on error.
*/
-
int container_path(const struct container *cont, char *buf, int buflen)
{
char *start;
@@ -663,9 +657,9 @@ int container_path(const struct containe
return 0;
}
-static inline void get_first_subsys(const struct container *cont,
- struct container_subsys_state **css,
- int *subsys_id) {
+static void get_first_subsys(const struct container *cont,
+ struct container_subsys_state **css, int *subsys_id)
+{
const struct containerfs_root *root = cont->root;
const struct container_subsys *test_ss;
BUG_ON(list_empty(&root->subsys_list));
@@ -681,17 +675,18 @@ static inline void get_first_subsys(cons
/* The various types of files and directories in a container file system */
-typedef enum {
+enum container_filetype {
FILE_ROOT,
FILE_DIR,
FILE_TASKLIST,
-} container_filetype_t;
+};
static ssize_t container_file_write(struct file *file, const char __user *buf,
size_t nbytes, loff_t *ppos)
{
struct cftype *cft = __d_cft(file->f_dentry);
struct container *cont = __d_cont(file->f_dentry->d_parent);
+
if (!cft)
return -ENODEV;
if (!cft->write)
@@ -708,6 +703,7 @@ static ssize_t container_read_uint(struc
char tmp[64];
u64 val = cft->read_uint(cont, cft);
int len = sprintf(tmp, "%llu\n", (unsigned long long) val);
+
return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
}
@@ -716,6 +712,7 @@ static ssize_t container_file_read(struc
{
struct cftype *cft = __d_cft(file->f_dentry);
struct container *cont = __d_cont(file->f_dentry->d_parent);
+
if (!cft)
return -ENODEV;
@@ -784,7 +781,8 @@ static struct inode_operations container
.rename = container_rename,
};
-static int container_create_file(struct dentry *dentry, int mode, struct
super_block *sb)
+static int container_create_file(struct dentry *dentry, int mode,
+ struct super_block *sb)
{
struct inode *inode;
@@ -825,7 +823,6 @@ static int container_create_file(struct
* name: The name to give to the container directory. Will be copied.
* mode: mode to set on new directory.
*/
-
static int container_create_dir(struct container *cont, struct dentry *dentry,
int mode)
{
@@ -855,7 +852,8 @@ int container_add_file(struct container
BUG_ON(!mutex_is_locked(&dir->d_inode->i_mutex));
dentry = container_get_dentry(dir, cft->name);
if (!IS_ERR(dentry)) {
- error = container_create_file(dentry, 0644 | S_IFREG,
cont->root->sb);
+ error = container_create_file(dentry, 0644 | S_IFREG,
+ cont->root->sb);
if (!error)
dentry->d_fsdata = (void *)cft;
dput(dentry);
@@ -869,7 +867,8 @@ int container_add_files(struct container
{
int i, err;
for (i = 0; i < count; i++) {
- if ((err = container_add_file(cont, &cft[i])))
+ err = container_add_file(cont, &cft[i]);
+ if (err)
return err;
}
return 0;
@@ -940,7 +939,8 @@ static long container_create(struct cont
for_each_subsys(root, ss) {
err = ss->create(ss, cont);
- if (err) goto err_destroy;
+ if (err)
+ goto err_destroy;
init_container_css(ss, cont);
}
@@ -1103,9 +1103,7 @@ static void container_init_subsys(struct
/**
* container_init_early - initialize containers at system boot, and
* initialize any subsystems that request early init.
- *
- **/
-
+ */
int __init container_init_early(void)
{
int i;
@@ -1133,8 +1131,7 @@ int __init container_init_early(void)
/**
* container_init - register container filesystem and /proc file, and
* initialize any subsystems that didn't request early init.
- **/
-
+ */
int __init container_init(void)
{
int err;
_
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