Those functions are in preparation for adding the freespace tree
repair code since it needs to be able to deal with bitmap based fsts.
This patch adds extent_buffer_bitmap_set and extent_buffer_bitmap_clear
functions. Since in userspace we don't have to deal with page mappings
their implementation is vastly simplified by simply setting each bit in
the passed range.
Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
extent_io.c | 39 +++++++++++++++++++++++++++++++++++++++
extent_io.h | 15 +++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/extent_io.c b/extent_io.c
index 198492699438..568a12f7084b 100644
--- a/extent_io.c
+++ b/extent_io.c
@@ -204,6 +204,45 @@ static int clear_state_bit(struct extent_io_tree *tree,
return ret;
}
+/**
+ * extent_buffer_bitmap_set - set an area of a bitmap
+ * @eb: the extent buffer
+ * @start: offset of the bitmap item in the extent buffer
+ * @pos: bit number of the first bit
+ * @len: number of bits to set
+ */
+void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len)
+{
+ u8 *kaddr = (u8 *)eb->data + start;
+
+ while (len) {
+ le_set_bit(pos, kaddr);
+ pos++;
+ len--;
+ }
+}
+
+
+/**
+ * extent_buffer_bitmap_clear - clear an area of a bitmap
+ * @eb: the extent buffer
+ * @start: offset of the bitmap item in the extent buffer
+ * @pos: bit number of the first bit
+ * @len: number of bits to clear
+ */
+void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len)
+{
+ u8 *kaddr = (u8 *)eb->data + start;
+
+ while (len) {
+ le_clear_bit(pos, kaddr);
+ pos++;
+ len--;
+ }
+}
+
/*
* clear some bits on a range in the tree.
*/
diff --git a/extent_io.h b/extent_io.h
index d407d93d617e..f9097911f5ef 100644
--- a/extent_io.h
+++ b/extent_io.h
@@ -68,6 +68,17 @@ static inline int le_test_bit(int nr, const u8 *addr)
return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
}
+
+static inline void le_set_bit(int nr, u8 *addr)
+{
+ addr[BIT_BYTE(nr)] |= (1U << (nr & (BITS_PER_BYTE-1)));
+}
+
+static inline void le_clear_bit(int nr, u8 *addr)
+{
+ addr[BIT_BYTE(nr)] &= ~(1U << (nr & (BITS_PER_BYTE-1)));
+}
+
struct btrfs_fs_info;
struct extent_io_tree {
@@ -175,4 +186,8 @@ int read_data_from_disk(struct btrfs_fs_info *info, void
*buf, u64 offset,
u64 bytes, int mirror);
int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
u64 bytes, int mirror);
+void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len);
+void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len);
#endif
--
2.7.4
--
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