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Merge branch 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Browse Source 
Pull cgroup updates from Tejun Heo:

 - xattr support added.  The implementation is shared with tmpfs.  The
   usage is restricted and intended to be used to manage per-cgroup
   metadata by system software.  tmpfs changes are routed through this
   branch with Hugh's permission.

 - cgroup subsystem ID handling simplified.

* 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: Define CGROUP_SUBSYS_COUNT according the configuration
  cgroup: Assign subsystem IDs during compile time
  cgroup: Do not depend on a given order when populating the subsys array
  cgroup: Wrap subsystem selection macro
  cgroup: Remove CGROUP_BUILTIN_SUBSYS_COUNT
  cgroup: net_prio: Do not define task_netpioidx() when not selected
  cgroup: net_cls: Do not define task_cls_classid() when not selected
  cgroup: net_cls: Move sock_update_classid() declaration to cls_cgroup.h
  cgroup: trivial fixes for Documentation/cgroups/cgroups.txt
  xattr: mark variable as uninitialized to make both gcc and smatch happy
  fs: add missing documentation to simple_xattr functions
  cgroup: add documentation on extended attributes usage
  cgroup: rename subsys_bits to subsys_mask
  cgroup: add xattr support
  cgroup: revise how we re-populate root directory
  xattr: extract simple_xattr code from tmpfs
This commit is contained in:
Linus Torvalds
2012-10-02 10:50:47 -07:00
parent 033d9959ed a6f00298b2
commit c0e8a139a5
15 changed files with 575 additions and 393 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/cgroup.h
+15 -10
View File
@@ -17,6 +17,7 @@
#include <linux/rwsem.h>
#include <linux/idr.h>
#include <linux/workqueue.h>
#include <linux/xattr.h>
#ifdef CONFIG_CGROUPS
@@ -45,17 +46,13 @@ extern const struct file_operations proc_cgroup_operations;
/* Define the enumeration of all builtin cgroup subsystems */
#define SUBSYS(_x) _x ## _subsys_id,
#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)
enum cgroup_subsys_id {
#include <linux/cgroup_subsys.h>
CGROUP_BUILTIN_SUBSYS_COUNT
CGROUP_SUBSYS_COUNT,
};
#undef IS_SUBSYS_ENABLED
#undef SUBSYS
/*
* This define indicates the maximum number of subsystems that can be loaded
* at once. We limit to this many since cgroupfs_root has subsys_bits to keep
* track of all of them.
*/
#define CGROUP_SUBSYS_COUNT (BITS_PER_BYTE*sizeof(unsigned long))
/* Per-subsystem/per-cgroup state maintained by the system. */
struct cgroup_subsys_state {
@@ -216,6 +213,9 @@ struct cgroup {
/* List of events which userspace want to receive */
struct list_head event_list;
spinlock_t event_list_lock;
/* directory xattrs */
struct simple_xattrs xattrs;
};
/*
@@ -309,6 +309,9 @@ struct cftype {
/* CFTYPE_* flags */
unsigned int flags;
/* file xattrs */
struct simple_xattrs xattrs;
int (*open)(struct inode *inode, struct file *file);
ssize_t (*read)(struct cgroup *cgrp, struct cftype *cft,
struct file *file,
@@ -394,7 +397,7 @@ struct cftype {
*/
struct cftype_set {
struct list_head node; /* chained at subsys->cftsets */
const struct cftype *cfts;
struct cftype *cfts;
};
struct cgroup_scanner {
@@ -406,8 +409,8 @@ struct cgroup_scanner {
void *data;
};
int cgroup_add_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts);
int cgroup_rm_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts);
int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_is_removed(const struct cgroup *cgrp);
@@ -521,7 +524,9 @@ struct cgroup_subsys {
};
#define SUBSYS(_x) extern struct cgroup_subsys _x ## _subsys;
#define IS_SUBSYS_ENABLED(option) IS_BUILTIN(option)
#include <linux/cgroup_subsys.h>
#undef IS_SUBSYS_ENABLED
#undef SUBSYS
static inline struct cgroup_subsys_state *cgroup_subsys_state(
include/linux/cgroup_subsys.h
+12 -12
View File
@@ -7,73 +7,73 @@
/* */
#ifdef CONFIG_CPUSETS
#if IS_SUBSYS_ENABLED(CONFIG_CPUSETS)
SUBSYS(cpuset)
#endif
/* */
#ifdef CONFIG_CGROUP_DEBUG
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_DEBUG)
SUBSYS(debug)
#endif
/* */
#ifdef CONFIG_CGROUP_SCHED
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_SCHED)
SUBSYS(cpu_cgroup)
#endif
/* */
#ifdef CONFIG_CGROUP_CPUACCT
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_CPUACCT)
SUBSYS(cpuacct)
#endif
/* */
#ifdef CONFIG_MEMCG
#if IS_SUBSYS_ENABLED(CONFIG_MEMCG)
SUBSYS(mem_cgroup)
#endif
/* */
#ifdef CONFIG_CGROUP_DEVICE
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_DEVICE)
SUBSYS(devices)
#endif
/* */
#ifdef CONFIG_CGROUP_FREEZER
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_FREEZER)
SUBSYS(freezer)
#endif
/* */
#ifdef CONFIG_NET_CLS_CGROUP
#if IS_SUBSYS_ENABLED(CONFIG_NET_CLS_CGROUP)
SUBSYS(net_cls)
#endif
/* */
#ifdef CONFIG_BLK_CGROUP
#if IS_SUBSYS_ENABLED(CONFIG_BLK_CGROUP)
SUBSYS(blkio)
#endif
/* */
#ifdef CONFIG_CGROUP_PERF
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_PERF)
SUBSYS(perf)
#endif
/* */
#ifdef CONFIG_NETPRIO_CGROUP
#if IS_SUBSYS_ENABLED(CONFIG_NETPRIO_CGROUP)
SUBSYS(net_prio)
#endif
/* */
#ifdef CONFIG_CGROUP_HUGETLB
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_HUGETLB)
SUBSYS(hugetlb)
#endif
include/linux/shmem_fs.h
+2 -1
View File
@@ -5,6 +5,7 @@
#include <linux/mempolicy.h>
#include <linux/pagemap.h>
#include <linux/percpu_counter.h>
#include <linux/xattr.h>
/* inode in-kernel data */
@@ -18,7 +19,7 @@ struct shmem_inode_info {
};
struct shared_policy policy; /* NUMA memory alloc policy */
struct list_head swaplist; /* chain of maybes on swap */
struct list_head xattr_list; /* list of shmem_xattr */
struct simple_xattrs xattrs; /* list of xattrs */
struct inode vfs_inode;
};
include/linux/xattr.h
+48
View File
@@ -59,7 +59,9 @@
#ifdef __KERNEL__
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/spinlock.h>
struct inode;
struct dentry;
@@ -96,6 +98,52 @@ ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
char **xattr_value, size_t size, gfp_t flags);
int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
const char *value, size_t size, gfp_t flags);
struct simple_xattrs {
struct list_head head;
spinlock_t lock;
};
struct simple_xattr {
struct list_head list;
char *name;
size_t size;
char value[0];
};
/*
* initialize the simple_xattrs structure
*/
static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
{
INIT_LIST_HEAD(&xattrs->head);
spin_lock_init(&xattrs->lock);
}
/*
* free all the xattrs
*/
static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
{
struct simple_xattr *xattr, *node;
list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
kfree(xattr->name);
kfree(xattr);
}
}
struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
void *buffer, size_t size);
int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
const void *value, size_t size, int flags);
int simple_xattr_remove(struct simple_xattrs *xattrs, const char *name);
ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
size_t size);
void simple_xattr_list_add(struct simple_xattrs *xattrs,
struct simple_xattr *new_xattr);
#endif /* __KERNEL__ */
#endif /* _LINUX_XATTR_H */