sysfs: Implement sysfs_getattr & sysfs_permission

With the implementation of sysfs_getattr and sysfs_permission
sysfs becomes able to lazily propogate inode attribute changes
from the sysfs_dirents to the vfs inodes.   This paves the way
for deleting significant chunks of now unnecessary code.

While doing this we did not reference sysfs_setattr from
sysfs_symlink_inode_operations so I added along with
sysfs_getattr and sysfs_permission.

Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 47 insertions, 17 deletions

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 76e977c300f7..1ffd5559926f 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -37,7 +37,9 @@ static struct backing_dev_info sysfs_backing_dev_info = {
 };
 
 static const struct inode_operations sysfs_inode_operations ={
+        .permission     = sysfs_permission,
         .setattr        = sysfs_setattr,
+        .getattr        = sysfs_getattr,
         .setxattr       = sysfs_setxattr,
 };
 
@@ -196,7 +198,6 @@ static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
 
 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;
@@ -227,38 +228,56 @@ static int sysfs_count_nlink(struct sysfs_dirent *sd)
         return nr + 2;
 }
 
+static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode)
+{
+        struct sysfs_inode_attrs *iattrs = sd->s_iattr;
+
+        inode->i_mode = sd->s_mode;
+        if (iattrs) {
+                /* sysfs_dirent has non-default attributes
+                 * get them from persistent copy in sysfs_dirent
+                 */
+                set_inode_attr(inode, &iattrs->ia_iattr);
+                security_inode_notifysecctx(inode,
+                                            iattrs->ia_secdata,
+                                            iattrs->ia_secdata_len);
+        }
+
+        if (sysfs_type(sd) == SYSFS_DIR)
+                inode->i_nlink = sysfs_count_nlink(sd);
+}
+
+int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+        struct sysfs_dirent *sd = dentry->d_fsdata;
+        struct inode *inode = dentry->d_inode;
+
+        mutex_lock(&sysfs_mutex);
+        sysfs_refresh_inode(sd, inode);
+        mutex_unlock(&sysfs_mutex);
+
+        generic_fillattr(inode, stat);
+        return 0;
+}
+
 static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
 {
         struct bin_attribute *bin_attr;
-        struct sysfs_inode_attrs *iattrs;
 
         inode->i_private = sysfs_get(sd);
         inode->i_mapping->a_ops = &sysfs_aops;
         inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
         inode->i_op = &sysfs_inode_operations;
-        inode->i_ino = sd->s_ino;
         lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
 
-        iattrs = sd->s_iattr;
-        if (iattrs) {
-                /* sysfs_dirent has non-default attributes
-                 * get them for the new inode from persistent copy
-                 * in sysfs_dirent
-                 */
-                set_inode_attr(inode, &iattrs->ia_iattr);
-                if (iattrs->ia_secdata)
-                        security_inode_notifysecctx(inode,
-                                                iattrs->ia_secdata,
-                                                iattrs->ia_secdata_len);
-        } else
-                set_default_inode_attr(inode, sd->s_mode);
+        set_default_inode_attr(inode, sd->s_mode);
+        sysfs_refresh_inode(sd, inode);
 
         /* initialize inode according to type */
         switch (sysfs_type(sd)) {
         case SYSFS_DIR:
                 inode->i_op = &sysfs_dir_inode_operations;
                 inode->i_fop = &sysfs_dir_operations;
-                inode->i_nlink = sysfs_count_nlink(sd);
                 break;
         case SYSFS_KOBJ_ATTR:
                 inode->i_size = PAGE_SIZE;
@@ -341,3 +360,14 @@ int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
         else
                 return -ENOENT;
 }
+
+int sysfs_permission(struct inode *inode, int mask)
+{
+        struct sysfs_dirent *sd = inode->i_private;
+
+        mutex_lock(&sysfs_mutex);
+        sysfs_refresh_inode(sd, inode);
+        mutex_unlock(&sysfs_mutex);
+
+        return generic_permission(inode, mask, NULL);
+}