Btrfs: Add inode flags support

This patch adds NODATASUM & NODATACOW inode flags support.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index f27e633..9fc9988 100644 (file)
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -34,6 +34,7 @@ struct btrfs_inode {
         * transid of the trans_handle that last modified this inode
         */
        u64 last_trans;
+       u32 flags;
 };
 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 {

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f0fb197..7eda515 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -447,7 +447,18 @@ struct btrfs_root {
 #define btrfs_set_opt(o, opt)          ((o) |= BTRFS_MOUNT_##opt)
 #define btrfs_test_opt(root, opt)      ((root)->fs_info->mount_opt & \
                                         BTRFS_MOUNT_##opt)
-
+/*
+ * Inode flags
+ */
+#define BTRFS_INODE_NODATASUM          0x1
+#define BTRFS_INODE_NODATACOW          0x2
+
+#define btrfs_clear_flag(inode, flag)  (BTRFS_I(inode)->flags &= \
+                                        ~BTRFS_INODE_##flag)
+#define btrfs_set_flag(inode, flag)    (BTRFS_I(inode)->flags |= \
+                                        BTRFS_INODE_##flag)
+#define btrfs_test_flag(inode, flag)   (BTRFS_I(inode)->flags & \
+                                        BTRFS_INODE_##flag)
 /* some macros to generate set/get funcs for the struct fields.  This
  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
  * one for u8:

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2817570..fba0478 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -243,9 +243,9 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
        struct btrfs_root *root = BTRFS_I(inode)->root;
        u64 num_bytes;
        int ret;
-
        mutex_lock(&root->fs_info->fs_mutex);
-       if (btrfs_test_opt(root, NODATACOW))
+       if (btrfs_test_opt(root, NODATACOW) ||
+           btrfs_test_flag(inode, NODATACOW))
                ret = run_delalloc_nocow(inode, start, end);
        else
                ret = cow_file_range(inode, start, end);
@@ -273,10 +273,9 @@ int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
        int ret = 0;
        u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
        size_t offset = start - page_start;
-
-       if (btrfs_test_opt(root, NODATASUM))
+       if (btrfs_test_opt(root, NODATASUM) ||
+           btrfs_test_flag(inode, NODATASUM))
                return 0;
-
        mutex_lock(&root->fs_info->fs_mutex);
        trans = btrfs_start_transaction(root, 1);
        btrfs_set_trans_block_group(trans, inode);
@@ -299,10 +298,9 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
        struct btrfs_csum_item *item;
        struct btrfs_path *path = NULL;
        u32 csum;
-
-       if (btrfs_test_opt(root, NODATASUM))
+       if (btrfs_test_opt(root, NODATASUM) ||
+           btrfs_test_flag(inode, 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);
@@ -335,10 +333,9 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
        struct btrfs_root *root = BTRFS_I(inode)->root;
        u32 csum = ~(u32)0;
        unsigned long flags;
-
-       if (btrfs_test_opt(root, NODATASUM))
+       if (btrfs_test_opt(root, NODATASUM) ||
+           btrfs_test_flag(inode, NODATASUM))
                return 0;
-
        ret = get_state_private(em_tree, start, &private);
        local_irq_save(flags);
        kaddr = kmap_atomic(page, KM_IRQ0);
@@ -415,7 +412,7 @@ void btrfs_read_locked_inode(struct inode *inode)
        alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
        BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
                                                       alloc_group_block);
-
+       BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
        if (!BTRFS_I(inode)->block_group) {
                BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
                                                         NULL, 0, 0, 0);
@@ -484,6 +481,7 @@ static void fill_inode_item(struct extent_buffer *leaf,
        btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
        btrfs_set_inode_generation(leaf, item, inode->i_generation);
        btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
+       btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
        btrfs_set_inode_block_group(leaf, item,
                                    BTRFS_I(inode)->block_group->key.objectid);
 }
@@ -1454,7 +1452,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
                owner = 1;
        group = btrfs_find_block_group(root, group, 0, 0, owner);
        BTRFS_I(inode)->block_group = group;
-
+       BTRFS_I(inode)->flags = 0;
        ret = btrfs_insert_empty_inode(trans, root, path, objectid);
        if (ret)
                goto fail;