Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / fs / sysfs / inode.c

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index c4ef945..555f0ff 100644 (file)
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -30,13 +30,18 @@ static const struct address_space_operations sysfs_aops = {
 
 static struct backing_dev_info sysfs_backing_dev_info = {
        .ra_pages       = 0,    /* No readahead */
-       .capabilities   = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+       .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
 };
 
 static const struct inode_operations sysfs_inode_operations ={
        .setattr        = sysfs_setattr,
 };
 
+int __init sysfs_inode_init(void)
+{
+       return bdi_init(&sysfs_backing_dev_info);
+}
+
 int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
 {
        struct inode * inode = dentry->d_inode;
@@ -54,6 +59,8 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
        if (error)
                return error;
 
+       iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
+
        error = inode_setattr(inode, iattr);
        if (error)
                return error;
@@ -100,8 +107,6 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
 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;
 }
 
@@ -142,7 +147,7 @@ static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
 {
        struct bin_attribute *bin_attr;
 
-       inode->i_blocks = 0;
+       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;
@@ -210,6 +215,22 @@ struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
        return inode;
 }
 
+/*
+ * The sysfs_dirent serves as both an inode and a directory entry for sysfs.
+ * To prevent the sysfs inode numbers from being freed prematurely we take a
+ * reference to sysfs_dirent from the sysfs inode.  A
+ * super_operations.delete_inode() implementation is needed to drop that
+ * reference upon inode destruction.
+ */
+void sysfs_delete_inode(struct inode *inode)
+{
+       struct sysfs_dirent *sd  = inode->i_private;
+
+       truncate_inode_pages(&inode->i_data, 0);
+       clear_inode(inode);
+       sysfs_put(sd);
+}
+
 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
 {
        struct sysfs_addrm_cxt acxt;