[PATCH] sysfs-iattr: set inode attributes

o Following patch sets the attributes for newly allocated inodes for sysfs
  objects. If the object has non-default attributes, inode attributes are
  set as saved in sysfs_dirent->s_iattr, pointer to struct iattr.

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 400c90b..565cac1 100644 (file)
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -91,18 +91,42 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
        return error;
 }
 
-struct inode * sysfs_new_inode(mode_t mode)
+static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
+{
+       inode->i_mode = mode;
+       inode->i_uid = 0;
+       inode->i_gid = 0;
+       inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+}
+
+static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
+{
+       inode->i_mode = iattr->ia_mode;
+       inode->i_uid = iattr->ia_uid;
+       inode->i_gid = iattr->ia_gid;
+       inode->i_atime = iattr->ia_atime;
+       inode->i_mtime = iattr->ia_mtime;
+       inode->i_ctime = iattr->ia_ctime;
+}
+
+struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent * sd)
 {
        struct inode * inode = new_inode(sysfs_sb);
        if (inode) {
-               inode->i_mode = mode;
-               inode->i_uid = 0;
-               inode->i_gid = 0;
                inode->i_blksize = PAGE_CACHE_SIZE;
                inode->i_blocks = 0;
-               inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
                inode->i_mapping->a_ops = &sysfs_aops;
                inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
+               inode->i_op = &sysfs_inode_operations;
+
+               if (sd->s_iattr) {
+                       /* sysfs_dirent has non-default attributes
+                        * get them for the new inode from persistent copy
+                        * in sysfs_dirent
+                        */
+                       set_inode_attr(inode, sd->s_iattr);
+               } else
+                       set_default_inode_attr(inode, mode);
        }
        return inode;
 }
@@ -113,7 +137,8 @@ int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
        struct inode * inode = NULL;
        if (dentry) {
                if (!dentry->d_inode) {
-                       if ((inode = sysfs_new_inode(mode))) {
+                       struct sysfs_dirent * sd = dentry->d_fsdata;
+                       if ((inode = sysfs_new_inode(mode, sd))) {
                                if (dentry->d_parent && dentry->d_parent->d_inode) {
                                        struct inode *p_inode = dentry->d_parent->d_inode;
                                        p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME;

diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 5c805bb..f1117e8 100644 (file)
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -28,6 +28,7 @@ static struct sysfs_dirent sysfs_root = {
        .s_children     = LIST_HEAD_INIT(sysfs_root.s_children),
        .s_element      = NULL,
        .s_type         = SYSFS_ROOT,
+       .s_iattr        = NULL,
 };
 
 static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
@@ -42,7 +43,8 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
        sb->s_time_gran = 1;
        sysfs_sb = sb;
 
-       inode = sysfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO);
+       inode = sysfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
+                                &sysfs_root);
        if (inode) {
                inode->i_op = &sysfs_dir_inode_operations;
                inode->i_fop = &sysfs_dir_operations;

diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index e8e9f0c..29da6f5 100644 (file)
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -2,7 +2,7 @@
 extern struct vfsmount * sysfs_mount;
 extern kmem_cache_t *sysfs_dir_cachep;
 
-extern struct inode * sysfs_new_inode(mode_t mode);
+extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
 
 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,