[PATCH] sysfs-iattr: add sysfs_setattr

[deliverable/linux.git] / fs / sysfs / inode.c

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index aff7b2dfa8eed3a4c4c76b81cfffd26f04344706..400c90be5685bb1d1f327678ece58296ef6ad255 100644 (file)
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -26,6 +26,71 @@ static struct backing_dev_info sysfs_backing_dev_info = {
        .capabilities   = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
 };
 
+static struct inode_operations sysfs_inode_operations ={
+       .setattr        = sysfs_setattr,
+};
+
+int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
+{
+       struct inode * inode = dentry->d_inode;
+       struct sysfs_dirent * sd = dentry->d_fsdata;
+       struct iattr * sd_iattr;
+       unsigned int ia_valid = iattr->ia_valid;
+       int error;
+
+       if (!sd)
+               return -EINVAL;
+
+       sd_iattr = sd->s_iattr;
+
+       error = inode_change_ok(inode, iattr);
+       if (error)
+               return error;
+
+       error = inode_setattr(inode, iattr);
+       if (error)
+               return error;
+
+       if (!sd_iattr) {
+               /* setting attributes for the first time, allocate now */
+               sd_iattr = kmalloc(sizeof(struct iattr), GFP_KERNEL);
+               if (!sd_iattr)
+                       return -ENOMEM;
+               /* assign default attributes */
+               memset(sd_iattr, 0, sizeof(struct iattr));
+               sd_iattr->ia_mode = sd->s_mode;
+               sd_iattr->ia_uid = 0;
+               sd_iattr->ia_gid = 0;
+               sd_iattr->ia_atime = sd_iattr->ia_mtime = sd_iattr->ia_ctime = CURRENT_TIME;
+               sd->s_iattr = sd_iattr;
+       }
+
+       /* attributes were changed atleast once in past */
+
+       if (ia_valid & ATTR_UID)
+               sd_iattr->ia_uid = iattr->ia_uid;
+       if (ia_valid & ATTR_GID)
+               sd_iattr->ia_gid = iattr->ia_gid;
+       if (ia_valid & ATTR_ATIME)
+               sd_iattr->ia_atime = timespec_trunc(iattr->ia_atime,
+                                               inode->i_sb->s_time_gran);
+       if (ia_valid & ATTR_MTIME)
+               sd_iattr->ia_mtime = timespec_trunc(iattr->ia_mtime,
+                                               inode->i_sb->s_time_gran);
+       if (ia_valid & ATTR_CTIME)
+               sd_iattr->ia_ctime = timespec_trunc(iattr->ia_ctime,
+                                               inode->i_sb->s_time_gran);
+       if (ia_valid & ATTR_MODE) {
+               umode_t mode = iattr->ia_mode;
+
+               if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
+                       mode &= ~S_ISGID;
+               sd_iattr->ia_mode = mode;
+       }
+
+       return error;
+}
+
 struct inode * sysfs_new_inode(mode_t mode)
 {
        struct inode * inode = new_inode(sysfs_sb);