The patch titled sysfs: reference sysfs_dirent from sysfs inodes has been removed from the -mm tree. Its filename was sysfs-reference-sysfs_dirent-from-sysfs-inodes.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: sysfs: reference sysfs_dirent from sysfs inodes From: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx> The sysfs_dirent serves as both an inode and a directory entry for sysfs. To prevent the sysfs inode numbers from being freed prematurely hold a reference to sysfs_dirent from the sysfs inode. [akpm@xxxxxxxxxxxxxxxxxxxx: add comment] Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Cornelia Huck <cornelia.huck@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/sysfs/inode.c | 17 +++++++++++++++++ fs/sysfs/mount.c | 1 + fs/sysfs/sysfs.h | 1 + 3 files changed, 19 insertions(+) diff -puN fs/sysfs/inode.c~sysfs-reference-sysfs_dirent-from-sysfs-inodes fs/sysfs/inode.c --- a/fs/sysfs/inode.c~sysfs-reference-sysfs_dirent-from-sysfs-inodes +++ a/fs/sysfs/inode.c @@ -147,6 +147,7 @@ static void sysfs_init_inode(struct sysf { struct bin_attribute *bin_attr; + 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; @@ -214,6 +215,22 @@ struct inode * sysfs_get_inode(struct sy 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; diff -puN fs/sysfs/mount.c~sysfs-reference-sysfs_dirent-from-sysfs-inodes fs/sysfs/mount.c --- a/fs/sysfs/mount.c~sysfs-reference-sysfs_dirent-from-sysfs-inodes +++ a/fs/sysfs/mount.c @@ -29,6 +29,7 @@ struct kmem_cache *sysfs_dir_cachep; static const struct super_operations sysfs_ops = { .statfs = simple_statfs, .drop_inode = generic_delete_inode, + .delete_inode = sysfs_delete_inode, }; struct sysfs_dirent sysfs_root = { diff -puN fs/sysfs/sysfs.h~sysfs-reference-sysfs_dirent-from-sysfs-inodes fs/sysfs/sysfs.h --- a/fs/sysfs/sysfs.h~sysfs-reference-sysfs_dirent-from-sysfs-inodes +++ a/fs/sysfs/sysfs.h @@ -145,6 +145,7 @@ static inline void __sysfs_put(struct sy * inode.c */ struct inode *sysfs_get_inode(struct sysfs_dirent *sd); +void sysfs_delete_inode(struct inode *inode); int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); int sysfs_inode_init(void); _ Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxxxxxxxx are linux-next.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html