diff options
author | Aristeu Rozanski <aris@redhat.com> | 2012-08-23 16:53:28 -0400 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2012-08-24 15:55:33 -0700 |
commit | 38f38657444d15e1a8574eae80ed3de9f501737a (patch) | |
tree | b39bf533c5acb4b3ee48b6602dea9d92c2e9f72f /include/linux/xattr.h | |
parent | fea7a08acb13524b47711625eebea40a0ede69a0 (diff) |
xattr: extract simple_xattr code from tmpfs
Extract in-memory xattr APIs from tmpfs. Will be used by cgroup.
$ size vmlinux.o
text data bss dec hex filename
4658782 880729 5195032 10734543 a3cbcf vmlinux.o
$ size vmlinux.o
text data bss dec hex filename
4658957 880729 5195032 10734718 a3cc7e vmlinux.o
v7:
- checkpatch warnings fixed
- Implement the changes requested by Hugh Dickins:
- make simple_xattrs_init and simple_xattrs_free inline
- get rid of locking and list reinitialization in simple_xattrs_free,
they're not needed
v6:
- no changes
v5:
- no changes
v4:
- move simple_xattrs_free() to fs/xattr.c
v3:
- in kmem_xattrs_free(), reinitialize the list
- use simple_xattr_* prefix
- introduce simple_xattr_add() to prevent direct list usage
Original-patch-by: Li Zefan <lizefan@huawei.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Lennart Poettering <lpoetter@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Aristeu Rozanski <aris@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/xattr.h')
-rw-r--r-- | include/linux/xattr.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/linux/xattr.h b/include/linux/xattr.h index e5d12203154..2ace7a60316 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -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 */ |