ping...
On 07/08/2013 06:38 PM, Gu Zheng wrote: > Introduce a new lib function anon_inode_getfile_private(), it creates a new > file > instance by hooking it up to an anonymous inode, and a dentry that describe > the > "class" of the file, similar to anon_inode_getfile(), but each file holds a > single inode. Furthermore, anyone who wants to create a private anon file will > benefit from this change. > > Signed-off-by: Gu Zheng <[email protected]> > Signed-off-by: Benjamin LaHaise <[email protected]> > --- > fs/anon_inodes.c | 66 > +++++++++++++++++++++++++++++++++++++++++++ > include/linux/anon_inodes.h | 3 ++ > 2 files changed, 69 insertions(+), 0 deletions(-) > > diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c > index 47a65df..85c9618 100644 > --- a/fs/anon_inodes.c > +++ b/fs/anon_inodes.c > @@ -109,6 +109,72 @@ static struct file_system_type anon_inode_fs_type = { > }; > > /** > + * anon_inode_getfile_private - creates a new file instance by hooking it up > to an > + * anonymous inode, and a dentry that describe the > "class" > + * of the file > + * > + * @name: [in] name of the "class" of the new file > + * @fops: [in] file operations for the new file > + * @priv: [in] private data for the new file (will be file's > private_data) > + * @flags: [in] flags > + * > + * > + * Similar to anon_inode_getfile, but each file holds a single inode. > + * > + */ > +struct file *anon_inode_getfile_private(const char *name, > + const struct file_operations *fops, > + void *priv, int flags) > +{ > + struct qstr this; > + struct path path; > + struct file *file; > + struct inode *inode; > + > + if (fops->owner && !try_module_get(fops->owner)) > + return ERR_PTR(-ENOENT); > + > + inode = anon_inode_mkinode(anon_inode_mnt->mnt_sb); > + if (IS_ERR(inode)) { > + file = ERR_PTR(-ENOMEM); > + goto err_module; > + } > + > + /* > + * Link the inode to a directory entry by creating a unique name > + * using the inode sequence number. > + */ > + file = ERR_PTR(-ENOMEM); > + this.name = name; > + this.len = strlen(name); > + this.hash = 0; > + path.dentry = d_alloc_pseudo(anon_inode_mnt->mnt_sb, &this); > + if (!path.dentry) > + goto err_module; > + > + path.mnt = mntget(anon_inode_mnt); > + > + d_instantiate(path.dentry, inode); > + > + file = alloc_file(&path, OPEN_FMODE(flags), fops); > + if (IS_ERR(file)) > + goto err_dput; > + > + file->f_mapping = inode->i_mapping; > + file->f_flags = flags & (O_ACCMODE | O_NONBLOCK); > + file->private_data = priv; > + > + return file; > + > +err_dput: > + path_put(&path); > +err_module: > + module_put(fops->owner); > + return file; > +} > +EXPORT_SYMBOL_GPL(anon_inode_getfile_private); > + > +/** > * anon_inode_getfile - creates a new file instance by hooking it up to an > * anonymous inode, and a dentry that describe the > "class" > * of the file > diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h > index 8013a45..cf573c2 100644 > --- a/include/linux/anon_inodes.h > +++ b/include/linux/anon_inodes.h > @@ -13,6 +13,9 @@ struct file_operations; > struct file *anon_inode_getfile(const char *name, > const struct file_operations *fops, > void *priv, int flags); > +struct file *anon_inode_getfile_private(const char *name, > + const struct file_operations *fops, > + void *priv, int flags); > int anon_inode_getfd(const char *name, const struct file_operations *fops, > void *priv, int flags); > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
