#ifndef __BTRFS_ORDERED_DATA__
#define __BTRFS_ORDERED_DATA__
+/* one of these per inode */
struct btrfs_ordered_inode_tree {
struct mutex mutex;
struct rb_root tree;
struct rb_node *last;
};
+/*
+ * these are used to collect checksums done just before bios submission.
+ * They are attached via a list into the ordered extent, and
+ * checksum items are inserted into the tree after all the blocks in
+ * the ordered extent are on disk
+ */
struct btrfs_sector_sum {
- u64 offset;
+ /* bytenr on disk */
+ u64 bytenr;
u32 sum;
};
struct btrfs_ordered_sum {
- u64 file_offset;
- u64 len;
+ /* bytenr is the start of this extent on disk */
+ u64 bytenr;
+
+ /*
+ * this is the length in bytes covered by the sums array below.
+ */
+ unsigned long len;
struct list_head list;
- struct btrfs_sector_sum sums;
+ /* last field is a variable length array of btrfs_sector_sums */
+ struct btrfs_sector_sum sums[];
};
-/* bits for the flags field */
+/*
+ * bits for the flags field:
+ *
+ * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
+ * It is used to make sure metadata is inserted into the tree only once
+ * per extent.
+ *
+ * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
+ * rbtree, just before waking any waiters. It is used to indicate the
+ * IO is done and any metadata is inserted into the tree.
+ */
#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
+
#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
-#define BTRFS_ORDERED_START 2 /* set when tree setup */
+
+#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
+
+#define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */
+
+#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
struct btrfs_ordered_extent {
+ /* logical offset in the file */
u64 file_offset;
+
+ /* disk byte number */
u64 start;
+
+ /* ram length of the extent in bytes */
u64 len;
+
+ /* extent length on disk */
+ u64 disk_len;
+
+ /* flags (described above) */
unsigned long flags;
+
+ /* reference count */
atomic_t refs;
- struct list_head list;
+
+ /* the inode we belong to */
struct inode *inode;
+
+ /* list of checksums for insertion when the extent io is done */
+ struct list_head list;
+
+ /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
wait_queue_head_t wait;
+
+ /* our friendly rbtree entry */
struct rb_node rb_node;
+
+ /* a per root list of all the pending ordered extents */
+ struct list_head root_extent_list;
};
-static inline int btrfs_ordered_sum_size(struct btrfs_root *root, u64 bytes)
+/*
+ * calculates the total size you need to allocate for an ordered sum
+ * structure spanning 'bytes' in the file
+ */
+static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
+ unsigned long bytes)
{
unsigned long num_sectors = (bytes + root->sectorsize - 1) /
root->sectorsize;
+ num_sectors++;
return sizeof(struct btrfs_ordered_sum) +
num_sectors * sizeof(struct btrfs_sector_sum);
}
int btrfs_dec_test_ordered_pending(struct inode *inode,
u64 file_offset, u64 io_size);
int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
- u64 start, u64 len);
-int btrfs_add_ordered_sum(struct inode *inode, struct btrfs_ordered_sum *sum);
+ u64 start, u64 len, u64 disk_len, int tyep);
+int btrfs_add_ordered_sum(struct inode *inode,
+ struct btrfs_ordered_extent *entry,
+ struct btrfs_ordered_sum *sum);
struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
u64 file_offset);
-void btrfs_wait_ordered_extent(struct inode *inode,
- struct btrfs_ordered_extent *entry);
-void btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
+void btrfs_start_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry, int wait);
+int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
struct btrfs_ordered_extent *
btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
-int btrfs_add_ordered_pending(struct inode *inode,
- struct btrfs_ordered_extent *ordered,
- u64 start, u64 len);
int btrfs_ordered_update_i_size(struct inode *inode,
struct btrfs_ordered_extent *ordered);
-int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u32 *sum);
+int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
+int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
+ pgoff_t start, pgoff_t end);
+int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
+ loff_t end, int sync_mode);
+int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff