From b6cda9bcb4df7544c67fc3548a53bc1607d59f46 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 14 Dec 2007 15:30:32 -0500 Subject: Btrfs: Add mount -o nodatasum to turn of file data checksumming Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index e535c50e669..11885cb114e 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -116,10 +116,13 @@ int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_trans_handle *trans; char *kaddr; - int ret; + int ret = 0; u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; size_t offset = start - page_start; + if (btrfs_test_opt(root, NODATASUM)) + return 0; + mutex_lock(&root->fs_info->fs_mutex); trans = btrfs_start_transaction(root, 1); btrfs_set_trans_block_group(trans, inode); @@ -143,6 +146,9 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) struct btrfs_path *path = NULL; u32 csum; + if (btrfs_test_opt(root, NODATASUM)) + return 0; + mutex_lock(&root->fs_info->fs_mutex); path = btrfs_alloc_path(); item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); @@ -176,6 +182,9 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) u32 csum = ~(u32)0; unsigned long flags; + if (btrfs_test_opt(root, NODATASUM)) + return 0; + ret = get_state_private(em_tree, start, &private); local_irq_save(flags); kaddr = kmap_atomic(page, KM_IRQ0); -- cgit v1.2.2