Btrfs: add readahead for send_write

Btrfs send reads data from disk and then writes to a stream via pipe or
a file via flush.

Currently we're going to read each page a time, so every page results
in a disk read, which is not friendly to disks, esp. HDD.  Given that,
the performance can be gained by adding readahead for those pages.

Here is a quick test:
$ btrfs subvolume create send
$ xfs_io -f -c "pwrite 0 1G" send/foobar
$ btrfs subvolume snap -r send ro
$ time "btrfs send ro -f /dev/null"

           w/o             w
real    1m37.527s       0m9.097s
user    0m0.122s        0m0.086s
sys     0m53.191s       0m12.857s

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 112eb647b5cd..646369179697 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -124,6 +124,8 @@ struct send_ctx {
         struct list_head name_cache_list;
         int name_cache_size;
 
+        struct file_ra_state ra;
+
         char *read_buf;
 
         /*
@@ -4170,6 +4172,13 @@ static ssize_t fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
                 goto out;
 
         last_index = (offset + len - 1) >> PAGE_CACHE_SHIFT;
+
+        /* initial readahead */
+        memset(&sctx->ra, 0, sizeof(struct file_ra_state));
+        file_ra_state_init(&sctx->ra, inode->i_mapping);
+        btrfs_force_ra(inode->i_mapping, &sctx->ra, NULL, index,
+                       last_index - index + 1);
+
         while (index <= last_index) {
                 unsigned cur_len = min_t(unsigned, len,
                                          PAGE_CACHE_SIZE - pg_offset);