Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx> --- fs/nfs/nfs4file.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index dcd39d4..c335cb0 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -4,6 +4,7 @@ * Copyright (C) 1992 Rick Sladkey */ #include <linux/fs.h> +#include <linux/file.h> #include <linux/falloc.h> #include <linux/nfs_fs.h> #include "internal.h" @@ -166,6 +167,54 @@ static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t return nfs42_proc_deallocate(filep, offset, len); return nfs42_proc_allocate(filep, offset, len); } + +static noinline int +nfs42_file_clone_range(struct file *src_file, struct file *dst_file, + loff_t src_off, size_t dst_off, loff_t count) +{ + struct inode *dst_inode = file_inode(dst_file); + struct inode *src_inode = file_inode(src_file); + int ret; + + /* src and dst must be different files */ + if (src_inode == dst_inode) + return -EINVAL; + + /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ + if (dst_inode < src_inode) { + mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD); + } else { + mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_CHILD); + } + + /* flush all pending writes on both src and dst so that server + * has the latest data */ + ret = nfs_sync_inode(src_inode); + if (ret) + goto out_unlock; + ret = nfs_sync_inode(dst_inode); + if (ret) + goto out_unlock; + + ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count); + + /* truncate inode page cache of the dst range so that future reads can fetch + * new data from server */ + if (!ret) + truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); + +out_unlock: + if (dst_inode < src_inode) { + mutex_unlock(&src_inode->i_mutex); + mutex_unlock(&dst_inode->i_mutex); + } else { + mutex_unlock(&dst_inode->i_mutex); + mutex_unlock(&src_inode->i_mutex); + } + return ret; +} #endif /* CONFIG_NFS_V4_2 */ const struct file_operations nfs4_file_operations = { @@ -187,6 +236,7 @@ const struct file_operations nfs4_file_operations = { .splice_write = iter_file_splice_write, #ifdef CONFIG_NFS_V4_2 .fallocate = nfs42_fallocate, + .clone_range = nfs42_file_clone_range, #endif /* CONFIG_NFS_V4_2 */ .check_flags = nfs_check_flags, .setlease = simple_nosetlease, -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html